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marcus.erl |
/*
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* linux/fs/ext4/super.c
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3 |
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*
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* Copyright (C) 1992, 1993, 1994, 1995
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* Remy Card (card@masi.ibp.fr)
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* Laboratoire MASI - Institut Blaise Pascal
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* Universite Pierre et Marie Curie (Paris VI)
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*
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* from
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*
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* linux/fs/minix/inode.c
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*
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* Copyright (C) 1991, 1992 Linus Torvalds
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*
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* Big-endian to little-endian byte-swapping/bitmaps by
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* David S. Miller (davem@caip.rutgers.edu), 1995
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*/
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#include <linux/module.h>
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#include <linux/string.h>
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#include <linux/fs.h>
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#include <linux/time.h>
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#include <linux/jbd2.h>
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#include <linux/ext4_fs.h>
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#include <linux/ext4_jbd2.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/blkdev.h>
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#include <linux/parser.h>
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#include <linux/smp_lock.h>
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#include <linux/buffer_head.h>
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#include <linux/exportfs.h>
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#include <linux/vfs.h>
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#include <linux/random.h>
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#include <linux/mount.h>
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#include <linux/namei.h>
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#include <linux/quotaops.h>
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#include <linux/seq_file.h>
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#include <linux/log2.h>
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#include <linux/crc16.h>
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#include <asm/uaccess.h>
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#include "xattr.h"
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#include "acl.h"
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#include "namei.h"
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#include "group.h"
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static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
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unsigned long journal_devnum);
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static int ext4_create_journal(struct super_block *, struct ext4_super_block *,
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unsigned int);
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static void ext4_commit_super (struct super_block * sb,
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struct ext4_super_block * es,
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int sync);
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static void ext4_mark_recovery_complete(struct super_block * sb,
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struct ext4_super_block * es);
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static void ext4_clear_journal_err(struct super_block * sb,
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struct ext4_super_block * es);
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static int ext4_sync_fs(struct super_block *sb, int wait);
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static const char *ext4_decode_error(struct super_block * sb, int errno,
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char nbuf[16]);
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static int ext4_remount (struct super_block * sb, int * flags, char * data);
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static int ext4_statfs (struct dentry * dentry, struct kstatfs * buf);
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static void ext4_unlockfs(struct super_block *sb);
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static void ext4_write_super (struct super_block * sb);
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static void ext4_write_super_lockfs(struct super_block *sb);
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ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
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struct ext4_group_desc *bg)
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{
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return le32_to_cpu(bg->bg_block_bitmap_lo) |
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(EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
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(ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
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}
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ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
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struct ext4_group_desc *bg)
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{
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return le32_to_cpu(bg->bg_inode_bitmap_lo) |
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(EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
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(ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
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}
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ext4_fsblk_t ext4_inode_table(struct super_block *sb,
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struct ext4_group_desc *bg)
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{
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return le32_to_cpu(bg->bg_inode_table_lo) |
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(EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
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(ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
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}
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void ext4_block_bitmap_set(struct super_block *sb,
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struct ext4_group_desc *bg, ext4_fsblk_t blk)
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{
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bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
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if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
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bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
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}
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void ext4_inode_bitmap_set(struct super_block *sb,
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struct ext4_group_desc *bg, ext4_fsblk_t blk)
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{
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bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
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if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
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bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
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}
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void ext4_inode_table_set(struct super_block *sb,
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struct ext4_group_desc *bg, ext4_fsblk_t blk)
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{
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bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
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if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
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bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
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}
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/*
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* Wrappers for jbd2_journal_start/end.
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*
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* The only special thing we need to do here is to make sure that all
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* journal_end calls result in the superblock being marked dirty, so
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* that sync() will call the filesystem's write_super callback if
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* appropriate.
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*/
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handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks)
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{
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journal_t *journal;
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if (sb->s_flags & MS_RDONLY)
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return ERR_PTR(-EROFS);
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/* Special case here: if the journal has aborted behind our
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* backs (eg. EIO in the commit thread), then we still need to
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* take the FS itself readonly cleanly. */
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journal = EXT4_SB(sb)->s_journal;
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if (is_journal_aborted(journal)) {
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ext4_abort(sb, __FUNCTION__,
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"Detected aborted journal");
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return ERR_PTR(-EROFS);
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}
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return jbd2_journal_start(journal, nblocks);
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}
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/*
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* The only special thing we need to do here is to make sure that all
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* jbd2_journal_stop calls result in the superblock being marked dirty, so
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* that sync() will call the filesystem's write_super callback if
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* appropriate.
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*/
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int __ext4_journal_stop(const char *where, handle_t *handle)
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{
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struct super_block *sb;
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int err;
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int rc;
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sb = handle->h_transaction->t_journal->j_private;
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err = handle->h_err;
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rc = jbd2_journal_stop(handle);
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if (!err)
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err = rc;
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if (err)
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__ext4_std_error(sb, where, err);
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return err;
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}
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void ext4_journal_abort_handle(const char *caller, const char *err_fn,
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struct buffer_head *bh, handle_t *handle, int err)
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{
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char nbuf[16];
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const char *errstr = ext4_decode_error(NULL, err, nbuf);
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if (bh)
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BUFFER_TRACE(bh, "abort");
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if (!handle->h_err)
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handle->h_err = err;
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180 |
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if (is_handle_aborted(handle))
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return;
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184 |
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printk(KERN_ERR "%s: aborting transaction: %s in %s\n",
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caller, errstr, err_fn);
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jbd2_journal_abort_handle(handle);
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}
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189 |
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190 |
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/* Deal with the reporting of failure conditions on a filesystem such as
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* inconsistencies detected or read IO failures.
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192 |
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*
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* On ext2, we can store the error state of the filesystem in the
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* superblock. That is not possible on ext4, because we may have other
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* write ordering constraints on the superblock which prevent us from
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* writing it out straight away; and given that the journal is about to
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* be aborted, we can't rely on the current, or future, transactions to
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* write out the superblock safely.
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*
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* We'll just use the jbd2_journal_abort() error code to record an error in
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* the journal instead. On recovery, the journal will compain about
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202 |
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* that error until we've noted it down and cleared it.
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203 |
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*/
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204 |
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205 |
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static void ext4_handle_error(struct super_block *sb)
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206 |
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{
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207 |
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struct ext4_super_block *es = EXT4_SB(sb)->s_es;
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208 |
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209 |
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EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
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es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
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211 |
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212 |
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if (sb->s_flags & MS_RDONLY)
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return;
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214 |
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215 |
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if (!test_opt (sb, ERRORS_CONT)) {
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216 |
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journal_t *journal = EXT4_SB(sb)->s_journal;
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217 |
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218 |
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EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT;
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219 |
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if (journal)
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220 |
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jbd2_journal_abort(journal, -EIO);
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221 |
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}
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222 |
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if (test_opt (sb, ERRORS_RO)) {
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223 |
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printk (KERN_CRIT "Remounting filesystem read-only\n");
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224 |
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sb->s_flags |= MS_RDONLY;
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225 |
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}
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226 |
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ext4_commit_super(sb, es, 1);
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227 |
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if (test_opt(sb, ERRORS_PANIC))
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panic("EXT4-fs (device %s): panic forced after error\n",
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sb->s_id);
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230 |
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}
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231 |
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232 |
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void ext4_error (struct super_block * sb, const char * function,
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233 |
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const char * fmt, ...)
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234 |
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{
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235 |
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va_list args;
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236 |
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237 |
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va_start(args, fmt);
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238 |
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printk(KERN_CRIT "EXT4-fs error (device %s): %s: ",sb->s_id, function);
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239 |
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vprintk(fmt, args);
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printk("\n");
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241 |
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va_end(args);
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242 |
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243 |
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ext4_handle_error(sb);
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}
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245 |
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246 |
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static const char *ext4_decode_error(struct super_block * sb, int errno,
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247 |
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char nbuf[16])
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248 |
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{
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249 |
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char *errstr = NULL;
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250 |
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251 |
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switch (errno) {
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252 |
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case -EIO:
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253 |
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errstr = "IO failure";
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254 |
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break;
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255 |
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case -ENOMEM:
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256 |
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errstr = "Out of memory";
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257 |
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break;
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258 |
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case -EROFS:
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259 |
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if (!sb || EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT)
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260 |
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errstr = "Journal has aborted";
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261 |
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else
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262 |
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errstr = "Readonly filesystem";
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263 |
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break;
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264 |
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default:
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265 |
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/* If the caller passed in an extra buffer for unknown
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266 |
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* errors, textualise them now. Else we just return
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267 |
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* NULL. */
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268 |
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if (nbuf) {
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269 |
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/* Check for truncated error codes... */
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270 |
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if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
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271 |
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errstr = nbuf;
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272 |
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}
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273 |
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break;
|
274 |
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}
|
275 |
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276 |
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return errstr;
|
277 |
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}
|
278 |
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|
279 |
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/* __ext4_std_error decodes expected errors from journaling functions
|
280 |
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* automatically and invokes the appropriate error response. */
|
281 |
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|
282 |
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void __ext4_std_error (struct super_block * sb, const char * function,
|
283 |
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int errno)
|
284 |
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{
|
285 |
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char nbuf[16];
|
286 |
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const char *errstr;
|
287 |
|
|
|
288 |
|
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/* Special case: if the error is EROFS, and we're not already
|
289 |
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* inside a transaction, then there's really no point in logging
|
290 |
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* an error. */
|
291 |
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if (errno == -EROFS && journal_current_handle() == NULL &&
|
292 |
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(sb->s_flags & MS_RDONLY))
|
293 |
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return;
|
294 |
|
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|
295 |
|
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errstr = ext4_decode_error(sb, errno, nbuf);
|
296 |
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printk (KERN_CRIT "EXT4-fs error (device %s) in %s: %s\n",
|
297 |
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sb->s_id, function, errstr);
|
298 |
|
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|
299 |
|
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ext4_handle_error(sb);
|
300 |
|
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}
|
301 |
|
|
|
302 |
|
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/*
|
303 |
|
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* ext4_abort is a much stronger failure handler than ext4_error. The
|
304 |
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* abort function may be used to deal with unrecoverable failures such
|
305 |
|
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* as journal IO errors or ENOMEM at a critical moment in log management.
|
306 |
|
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*
|
307 |
|
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* We unconditionally force the filesystem into an ABORT|READONLY state,
|
308 |
|
|
* unless the error response on the fs has been set to panic in which
|
309 |
|
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* case we take the easy way out and panic immediately.
|
310 |
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*/
|
311 |
|
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|
312 |
|
|
void ext4_abort (struct super_block * sb, const char * function,
|
313 |
|
|
const char * fmt, ...)
|
314 |
|
|
{
|
315 |
|
|
va_list args;
|
316 |
|
|
|
317 |
|
|
printk (KERN_CRIT "ext4_abort called.\n");
|
318 |
|
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|
319 |
|
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va_start(args, fmt);
|
320 |
|
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printk(KERN_CRIT "EXT4-fs error (device %s): %s: ",sb->s_id, function);
|
321 |
|
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vprintk(fmt, args);
|
322 |
|
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printk("\n");
|
323 |
|
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va_end(args);
|
324 |
|
|
|
325 |
|
|
if (test_opt(sb, ERRORS_PANIC))
|
326 |
|
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panic("EXT4-fs panic from previous error\n");
|
327 |
|
|
|
328 |
|
|
if (sb->s_flags & MS_RDONLY)
|
329 |
|
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return;
|
330 |
|
|
|
331 |
|
|
printk(KERN_CRIT "Remounting filesystem read-only\n");
|
332 |
|
|
EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
|
333 |
|
|
sb->s_flags |= MS_RDONLY;
|
334 |
|
|
EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT;
|
335 |
|
|
jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
|
336 |
|
|
}
|
337 |
|
|
|
338 |
|
|
void ext4_warning (struct super_block * sb, const char * function,
|
339 |
|
|
const char * fmt, ...)
|
340 |
|
|
{
|
341 |
|
|
va_list args;
|
342 |
|
|
|
343 |
|
|
va_start(args, fmt);
|
344 |
|
|
printk(KERN_WARNING "EXT4-fs warning (device %s): %s: ",
|
345 |
|
|
sb->s_id, function);
|
346 |
|
|
vprintk(fmt, args);
|
347 |
|
|
printk("\n");
|
348 |
|
|
va_end(args);
|
349 |
|
|
}
|
350 |
|
|
|
351 |
|
|
void ext4_update_dynamic_rev(struct super_block *sb)
|
352 |
|
|
{
|
353 |
|
|
struct ext4_super_block *es = EXT4_SB(sb)->s_es;
|
354 |
|
|
|
355 |
|
|
if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
|
356 |
|
|
return;
|
357 |
|
|
|
358 |
|
|
ext4_warning(sb, __FUNCTION__,
|
359 |
|
|
"updating to rev %d because of new feature flag, "
|
360 |
|
|
"running e2fsck is recommended",
|
361 |
|
|
EXT4_DYNAMIC_REV);
|
362 |
|
|
|
363 |
|
|
es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
|
364 |
|
|
es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
|
365 |
|
|
es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
|
366 |
|
|
/* leave es->s_feature_*compat flags alone */
|
367 |
|
|
/* es->s_uuid will be set by e2fsck if empty */
|
368 |
|
|
|
369 |
|
|
/*
|
370 |
|
|
* The rest of the superblock fields should be zero, and if not it
|
371 |
|
|
* means they are likely already in use, so leave them alone. We
|
372 |
|
|
* can leave it up to e2fsck to clean up any inconsistencies there.
|
373 |
|
|
*/
|
374 |
|
|
}
|
375 |
|
|
|
376 |
|
|
/*
|
377 |
|
|
* Open the external journal device
|
378 |
|
|
*/
|
379 |
|
|
static struct block_device *ext4_blkdev_get(dev_t dev)
|
380 |
|
|
{
|
381 |
|
|
struct block_device *bdev;
|
382 |
|
|
char b[BDEVNAME_SIZE];
|
383 |
|
|
|
384 |
|
|
bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
|
385 |
|
|
if (IS_ERR(bdev))
|
386 |
|
|
goto fail;
|
387 |
|
|
return bdev;
|
388 |
|
|
|
389 |
|
|
fail:
|
390 |
|
|
printk(KERN_ERR "EXT4: failed to open journal device %s: %ld\n",
|
391 |
|
|
__bdevname(dev, b), PTR_ERR(bdev));
|
392 |
|
|
return NULL;
|
393 |
|
|
}
|
394 |
|
|
|
395 |
|
|
/*
|
396 |
|
|
* Release the journal device
|
397 |
|
|
*/
|
398 |
|
|
static int ext4_blkdev_put(struct block_device *bdev)
|
399 |
|
|
{
|
400 |
|
|
bd_release(bdev);
|
401 |
|
|
return blkdev_put(bdev);
|
402 |
|
|
}
|
403 |
|
|
|
404 |
|
|
static int ext4_blkdev_remove(struct ext4_sb_info *sbi)
|
405 |
|
|
{
|
406 |
|
|
struct block_device *bdev;
|
407 |
|
|
int ret = -ENODEV;
|
408 |
|
|
|
409 |
|
|
bdev = sbi->journal_bdev;
|
410 |
|
|
if (bdev) {
|
411 |
|
|
ret = ext4_blkdev_put(bdev);
|
412 |
|
|
sbi->journal_bdev = NULL;
|
413 |
|
|
}
|
414 |
|
|
return ret;
|
415 |
|
|
}
|
416 |
|
|
|
417 |
|
|
static inline struct inode *orphan_list_entry(struct list_head *l)
|
418 |
|
|
{
|
419 |
|
|
return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
|
420 |
|
|
}
|
421 |
|
|
|
422 |
|
|
static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
|
423 |
|
|
{
|
424 |
|
|
struct list_head *l;
|
425 |
|
|
|
426 |
|
|
printk(KERN_ERR "sb orphan head is %d\n",
|
427 |
|
|
le32_to_cpu(sbi->s_es->s_last_orphan));
|
428 |
|
|
|
429 |
|
|
printk(KERN_ERR "sb_info orphan list:\n");
|
430 |
|
|
list_for_each(l, &sbi->s_orphan) {
|
431 |
|
|
struct inode *inode = orphan_list_entry(l);
|
432 |
|
|
printk(KERN_ERR " "
|
433 |
|
|
"inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
|
434 |
|
|
inode->i_sb->s_id, inode->i_ino, inode,
|
435 |
|
|
inode->i_mode, inode->i_nlink,
|
436 |
|
|
NEXT_ORPHAN(inode));
|
437 |
|
|
}
|
438 |
|
|
}
|
439 |
|
|
|
440 |
|
|
static void ext4_put_super (struct super_block * sb)
|
441 |
|
|
{
|
442 |
|
|
struct ext4_sb_info *sbi = EXT4_SB(sb);
|
443 |
|
|
struct ext4_super_block *es = sbi->s_es;
|
444 |
|
|
int i;
|
445 |
|
|
|
446 |
|
|
ext4_ext_release(sb);
|
447 |
|
|
ext4_xattr_put_super(sb);
|
448 |
|
|
jbd2_journal_destroy(sbi->s_journal);
|
449 |
|
|
if (!(sb->s_flags & MS_RDONLY)) {
|
450 |
|
|
EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
|
451 |
|
|
es->s_state = cpu_to_le16(sbi->s_mount_state);
|
452 |
|
|
BUFFER_TRACE(sbi->s_sbh, "marking dirty");
|
453 |
|
|
mark_buffer_dirty(sbi->s_sbh);
|
454 |
|
|
ext4_commit_super(sb, es, 1);
|
455 |
|
|
}
|
456 |
|
|
|
457 |
|
|
for (i = 0; i < sbi->s_gdb_count; i++)
|
458 |
|
|
brelse(sbi->s_group_desc[i]);
|
459 |
|
|
kfree(sbi->s_group_desc);
|
460 |
|
|
percpu_counter_destroy(&sbi->s_freeblocks_counter);
|
461 |
|
|
percpu_counter_destroy(&sbi->s_freeinodes_counter);
|
462 |
|
|
percpu_counter_destroy(&sbi->s_dirs_counter);
|
463 |
|
|
brelse(sbi->s_sbh);
|
464 |
|
|
#ifdef CONFIG_QUOTA
|
465 |
|
|
for (i = 0; i < MAXQUOTAS; i++)
|
466 |
|
|
kfree(sbi->s_qf_names[i]);
|
467 |
|
|
#endif
|
468 |
|
|
|
469 |
|
|
/* Debugging code just in case the in-memory inode orphan list
|
470 |
|
|
* isn't empty. The on-disk one can be non-empty if we've
|
471 |
|
|
* detected an error and taken the fs readonly, but the
|
472 |
|
|
* in-memory list had better be clean by this point. */
|
473 |
|
|
if (!list_empty(&sbi->s_orphan))
|
474 |
|
|
dump_orphan_list(sb, sbi);
|
475 |
|
|
J_ASSERT(list_empty(&sbi->s_orphan));
|
476 |
|
|
|
477 |
|
|
invalidate_bdev(sb->s_bdev);
|
478 |
|
|
if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
|
479 |
|
|
/*
|
480 |
|
|
* Invalidate the journal device's buffers. We don't want them
|
481 |
|
|
* floating about in memory - the physical journal device may
|
482 |
|
|
* hotswapped, and it breaks the `ro-after' testing code.
|
483 |
|
|
*/
|
484 |
|
|
sync_blockdev(sbi->journal_bdev);
|
485 |
|
|
invalidate_bdev(sbi->journal_bdev);
|
486 |
|
|
ext4_blkdev_remove(sbi);
|
487 |
|
|
}
|
488 |
|
|
sb->s_fs_info = NULL;
|
489 |
|
|
kfree(sbi);
|
490 |
|
|
return;
|
491 |
|
|
}
|
492 |
|
|
|
493 |
|
|
static struct kmem_cache *ext4_inode_cachep;
|
494 |
|
|
|
495 |
|
|
/*
|
496 |
|
|
* Called inside transaction, so use GFP_NOFS
|
497 |
|
|
*/
|
498 |
|
|
static struct inode *ext4_alloc_inode(struct super_block *sb)
|
499 |
|
|
{
|
500 |
|
|
struct ext4_inode_info *ei;
|
501 |
|
|
|
502 |
|
|
ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
|
503 |
|
|
if (!ei)
|
504 |
|
|
return NULL;
|
505 |
|
|
#ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
|
506 |
|
|
ei->i_acl = EXT4_ACL_NOT_CACHED;
|
507 |
|
|
ei->i_default_acl = EXT4_ACL_NOT_CACHED;
|
508 |
|
|
#endif
|
509 |
|
|
ei->i_block_alloc_info = NULL;
|
510 |
|
|
ei->vfs_inode.i_version = 1;
|
511 |
|
|
memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache));
|
512 |
|
|
return &ei->vfs_inode;
|
513 |
|
|
}
|
514 |
|
|
|
515 |
|
|
static void ext4_destroy_inode(struct inode *inode)
|
516 |
|
|
{
|
517 |
|
|
if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
|
518 |
|
|
printk("EXT4 Inode %p: orphan list check failed!\n",
|
519 |
|
|
EXT4_I(inode));
|
520 |
|
|
print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
|
521 |
|
|
EXT4_I(inode), sizeof(struct ext4_inode_info),
|
522 |
|
|
true);
|
523 |
|
|
dump_stack();
|
524 |
|
|
}
|
525 |
|
|
kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
|
526 |
|
|
}
|
527 |
|
|
|
528 |
|
|
static void init_once(struct kmem_cache *cachep, void *foo)
|
529 |
|
|
{
|
530 |
|
|
struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
|
531 |
|
|
|
532 |
|
|
INIT_LIST_HEAD(&ei->i_orphan);
|
533 |
|
|
#ifdef CONFIG_EXT4DEV_FS_XATTR
|
534 |
|
|
init_rwsem(&ei->xattr_sem);
|
535 |
|
|
#endif
|
536 |
|
|
mutex_init(&ei->truncate_mutex);
|
537 |
|
|
inode_init_once(&ei->vfs_inode);
|
538 |
|
|
}
|
539 |
|
|
|
540 |
|
|
static int init_inodecache(void)
|
541 |
|
|
{
|
542 |
|
|
ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
|
543 |
|
|
sizeof(struct ext4_inode_info),
|
544 |
|
|
0, (SLAB_RECLAIM_ACCOUNT|
|
545 |
|
|
SLAB_MEM_SPREAD),
|
546 |
|
|
init_once);
|
547 |
|
|
if (ext4_inode_cachep == NULL)
|
548 |
|
|
return -ENOMEM;
|
549 |
|
|
return 0;
|
550 |
|
|
}
|
551 |
|
|
|
552 |
|
|
static void destroy_inodecache(void)
|
553 |
|
|
{
|
554 |
|
|
kmem_cache_destroy(ext4_inode_cachep);
|
555 |
|
|
}
|
556 |
|
|
|
557 |
|
|
static void ext4_clear_inode(struct inode *inode)
|
558 |
|
|
{
|
559 |
|
|
struct ext4_block_alloc_info *rsv = EXT4_I(inode)->i_block_alloc_info;
|
560 |
|
|
#ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
|
561 |
|
|
if (EXT4_I(inode)->i_acl &&
|
562 |
|
|
EXT4_I(inode)->i_acl != EXT4_ACL_NOT_CACHED) {
|
563 |
|
|
posix_acl_release(EXT4_I(inode)->i_acl);
|
564 |
|
|
EXT4_I(inode)->i_acl = EXT4_ACL_NOT_CACHED;
|
565 |
|
|
}
|
566 |
|
|
if (EXT4_I(inode)->i_default_acl &&
|
567 |
|
|
EXT4_I(inode)->i_default_acl != EXT4_ACL_NOT_CACHED) {
|
568 |
|
|
posix_acl_release(EXT4_I(inode)->i_default_acl);
|
569 |
|
|
EXT4_I(inode)->i_default_acl = EXT4_ACL_NOT_CACHED;
|
570 |
|
|
}
|
571 |
|
|
#endif
|
572 |
|
|
ext4_discard_reservation(inode);
|
573 |
|
|
EXT4_I(inode)->i_block_alloc_info = NULL;
|
574 |
|
|
if (unlikely(rsv))
|
575 |
|
|
kfree(rsv);
|
576 |
|
|
}
|
577 |
|
|
|
578 |
|
|
static inline void ext4_show_quota_options(struct seq_file *seq, struct super_block *sb)
|
579 |
|
|
{
|
580 |
|
|
#if defined(CONFIG_QUOTA)
|
581 |
|
|
struct ext4_sb_info *sbi = EXT4_SB(sb);
|
582 |
|
|
|
583 |
|
|
if (sbi->s_jquota_fmt)
|
584 |
|
|
seq_printf(seq, ",jqfmt=%s",
|
585 |
|
|
(sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold": "vfsv0");
|
586 |
|
|
|
587 |
|
|
if (sbi->s_qf_names[USRQUOTA])
|
588 |
|
|
seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
|
589 |
|
|
|
590 |
|
|
if (sbi->s_qf_names[GRPQUOTA])
|
591 |
|
|
seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
|
592 |
|
|
|
593 |
|
|
if (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA)
|
594 |
|
|
seq_puts(seq, ",usrquota");
|
595 |
|
|
|
596 |
|
|
if (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)
|
597 |
|
|
seq_puts(seq, ",grpquota");
|
598 |
|
|
#endif
|
599 |
|
|
}
|
600 |
|
|
|
601 |
|
|
/*
|
602 |
|
|
* Show an option if
|
603 |
|
|
* - it's set to a non-default value OR
|
604 |
|
|
* - if the per-sb default is different from the global default
|
605 |
|
|
*/
|
606 |
|
|
static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs)
|
607 |
|
|
{
|
608 |
|
|
struct super_block *sb = vfs->mnt_sb;
|
609 |
|
|
struct ext4_sb_info *sbi = EXT4_SB(sb);
|
610 |
|
|
struct ext4_super_block *es = sbi->s_es;
|
611 |
|
|
unsigned long def_mount_opts;
|
612 |
|
|
|
613 |
|
|
def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
|
614 |
|
|
|
615 |
|
|
if (sbi->s_sb_block != 1)
|
616 |
|
|
seq_printf(seq, ",sb=%llu", sbi->s_sb_block);
|
617 |
|
|
if (test_opt(sb, MINIX_DF))
|
618 |
|
|
seq_puts(seq, ",minixdf");
|
619 |
|
|
if (test_opt(sb, GRPID))
|
620 |
|
|
seq_puts(seq, ",grpid");
|
621 |
|
|
if (!test_opt(sb, GRPID) && (def_mount_opts & EXT4_DEFM_BSDGROUPS))
|
622 |
|
|
seq_puts(seq, ",nogrpid");
|
623 |
|
|
if (sbi->s_resuid != EXT4_DEF_RESUID ||
|
624 |
|
|
le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) {
|
625 |
|
|
seq_printf(seq, ",resuid=%u", sbi->s_resuid);
|
626 |
|
|
}
|
627 |
|
|
if (sbi->s_resgid != EXT4_DEF_RESGID ||
|
628 |
|
|
le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) {
|
629 |
|
|
seq_printf(seq, ",resgid=%u", sbi->s_resgid);
|
630 |
|
|
}
|
631 |
|
|
if (test_opt(sb, ERRORS_CONT)) {
|
632 |
|
|
int def_errors = le16_to_cpu(es->s_errors);
|
633 |
|
|
|
634 |
|
|
if (def_errors == EXT4_ERRORS_PANIC ||
|
635 |
|
|
def_errors == EXT4_ERRORS_RO) {
|
636 |
|
|
seq_puts(seq, ",errors=continue");
|
637 |
|
|
}
|
638 |
|
|
}
|
639 |
|
|
if (test_opt(sb, ERRORS_RO))
|
640 |
|
|
seq_puts(seq, ",errors=remount-ro");
|
641 |
|
|
if (test_opt(sb, ERRORS_PANIC))
|
642 |
|
|
seq_puts(seq, ",errors=panic");
|
643 |
|
|
if (test_opt(sb, NO_UID32))
|
644 |
|
|
seq_puts(seq, ",nouid32");
|
645 |
|
|
if (test_opt(sb, DEBUG))
|
646 |
|
|
seq_puts(seq, ",debug");
|
647 |
|
|
if (test_opt(sb, OLDALLOC))
|
648 |
|
|
seq_puts(seq, ",oldalloc");
|
649 |
|
|
#ifdef CONFIG_EXT4_FS_XATTR
|
650 |
|
|
if (test_opt(sb, XATTR_USER))
|
651 |
|
|
seq_puts(seq, ",user_xattr");
|
652 |
|
|
if (!test_opt(sb, XATTR_USER) &&
|
653 |
|
|
(def_mount_opts & EXT4_DEFM_XATTR_USER)) {
|
654 |
|
|
seq_puts(seq, ",nouser_xattr");
|
655 |
|
|
}
|
656 |
|
|
#endif
|
657 |
|
|
#ifdef CONFIG_EXT4_FS_POSIX_ACL
|
658 |
|
|
if (test_opt(sb, POSIX_ACL))
|
659 |
|
|
seq_puts(seq, ",acl");
|
660 |
|
|
if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT4_DEFM_ACL))
|
661 |
|
|
seq_puts(seq, ",noacl");
|
662 |
|
|
#endif
|
663 |
|
|
if (!test_opt(sb, RESERVATION))
|
664 |
|
|
seq_puts(seq, ",noreservation");
|
665 |
|
|
if (sbi->s_commit_interval) {
|
666 |
|
|
seq_printf(seq, ",commit=%u",
|
667 |
|
|
(unsigned) (sbi->s_commit_interval / HZ));
|
668 |
|
|
}
|
669 |
|
|
if (test_opt(sb, BARRIER))
|
670 |
|
|
seq_puts(seq, ",barrier=1");
|
671 |
|
|
if (test_opt(sb, NOBH))
|
672 |
|
|
seq_puts(seq, ",nobh");
|
673 |
|
|
if (!test_opt(sb, EXTENTS))
|
674 |
|
|
seq_puts(seq, ",noextents");
|
675 |
|
|
|
676 |
|
|
if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
|
677 |
|
|
seq_puts(seq, ",data=journal");
|
678 |
|
|
else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
|
679 |
|
|
seq_puts(seq, ",data=ordered");
|
680 |
|
|
else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
|
681 |
|
|
seq_puts(seq, ",data=writeback");
|
682 |
|
|
|
683 |
|
|
ext4_show_quota_options(seq, sb);
|
684 |
|
|
|
685 |
|
|
return 0;
|
686 |
|
|
}
|
687 |
|
|
|
688 |
|
|
|
689 |
|
|
static struct inode *ext4_nfs_get_inode(struct super_block *sb,
|
690 |
|
|
u64 ino, u32 generation)
|
691 |
|
|
{
|
692 |
|
|
struct inode *inode;
|
693 |
|
|
|
694 |
|
|
if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
|
695 |
|
|
return ERR_PTR(-ESTALE);
|
696 |
|
|
if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
|
697 |
|
|
return ERR_PTR(-ESTALE);
|
698 |
|
|
|
699 |
|
|
/* iget isn't really right if the inode is currently unallocated!!
|
700 |
|
|
*
|
701 |
|
|
* ext4_read_inode will return a bad_inode if the inode had been
|
702 |
|
|
* deleted, so we should be safe.
|
703 |
|
|
*
|
704 |
|
|
* Currently we don't know the generation for parent directory, so
|
705 |
|
|
* a generation of 0 means "accept any"
|
706 |
|
|
*/
|
707 |
|
|
inode = iget(sb, ino);
|
708 |
|
|
if (inode == NULL)
|
709 |
|
|
return ERR_PTR(-ENOMEM);
|
710 |
|
|
if (is_bad_inode(inode) ||
|
711 |
|
|
(generation && inode->i_generation != generation)) {
|
712 |
|
|
iput(inode);
|
713 |
|
|
return ERR_PTR(-ESTALE);
|
714 |
|
|
}
|
715 |
|
|
|
716 |
|
|
return inode;
|
717 |
|
|
}
|
718 |
|
|
|
719 |
|
|
static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
|
720 |
|
|
int fh_len, int fh_type)
|
721 |
|
|
{
|
722 |
|
|
return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
|
723 |
|
|
ext4_nfs_get_inode);
|
724 |
|
|
}
|
725 |
|
|
|
726 |
|
|
static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
|
727 |
|
|
int fh_len, int fh_type)
|
728 |
|
|
{
|
729 |
|
|
return generic_fh_to_parent(sb, fid, fh_len, fh_type,
|
730 |
|
|
ext4_nfs_get_inode);
|
731 |
|
|
}
|
732 |
|
|
|
733 |
|
|
#ifdef CONFIG_QUOTA
|
734 |
|
|
#define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
|
735 |
|
|
#define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
|
736 |
|
|
|
737 |
|
|
static int ext4_dquot_initialize(struct inode *inode, int type);
|
738 |
|
|
static int ext4_dquot_drop(struct inode *inode);
|
739 |
|
|
static int ext4_write_dquot(struct dquot *dquot);
|
740 |
|
|
static int ext4_acquire_dquot(struct dquot *dquot);
|
741 |
|
|
static int ext4_release_dquot(struct dquot *dquot);
|
742 |
|
|
static int ext4_mark_dquot_dirty(struct dquot *dquot);
|
743 |
|
|
static int ext4_write_info(struct super_block *sb, int type);
|
744 |
|
|
static int ext4_quota_on(struct super_block *sb, int type, int format_id, char *path);
|
745 |
|
|
static int ext4_quota_on_mount(struct super_block *sb, int type);
|
746 |
|
|
static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
|
747 |
|
|
size_t len, loff_t off);
|
748 |
|
|
static ssize_t ext4_quota_write(struct super_block *sb, int type,
|
749 |
|
|
const char *data, size_t len, loff_t off);
|
750 |
|
|
|
751 |
|
|
static struct dquot_operations ext4_quota_operations = {
|
752 |
|
|
.initialize = ext4_dquot_initialize,
|
753 |
|
|
.drop = ext4_dquot_drop,
|
754 |
|
|
.alloc_space = dquot_alloc_space,
|
755 |
|
|
.alloc_inode = dquot_alloc_inode,
|
756 |
|
|
.free_space = dquot_free_space,
|
757 |
|
|
.free_inode = dquot_free_inode,
|
758 |
|
|
.transfer = dquot_transfer,
|
759 |
|
|
.write_dquot = ext4_write_dquot,
|
760 |
|
|
.acquire_dquot = ext4_acquire_dquot,
|
761 |
|
|
.release_dquot = ext4_release_dquot,
|
762 |
|
|
.mark_dirty = ext4_mark_dquot_dirty,
|
763 |
|
|
.write_info = ext4_write_info
|
764 |
|
|
};
|
765 |
|
|
|
766 |
|
|
static struct quotactl_ops ext4_qctl_operations = {
|
767 |
|
|
.quota_on = ext4_quota_on,
|
768 |
|
|
.quota_off = vfs_quota_off,
|
769 |
|
|
.quota_sync = vfs_quota_sync,
|
770 |
|
|
.get_info = vfs_get_dqinfo,
|
771 |
|
|
.set_info = vfs_set_dqinfo,
|
772 |
|
|
.get_dqblk = vfs_get_dqblk,
|
773 |
|
|
.set_dqblk = vfs_set_dqblk
|
774 |
|
|
};
|
775 |
|
|
#endif
|
776 |
|
|
|
777 |
|
|
static const struct super_operations ext4_sops = {
|
778 |
|
|
.alloc_inode = ext4_alloc_inode,
|
779 |
|
|
.destroy_inode = ext4_destroy_inode,
|
780 |
|
|
.read_inode = ext4_read_inode,
|
781 |
|
|
.write_inode = ext4_write_inode,
|
782 |
|
|
.dirty_inode = ext4_dirty_inode,
|
783 |
|
|
.delete_inode = ext4_delete_inode,
|
784 |
|
|
.put_super = ext4_put_super,
|
785 |
|
|
.write_super = ext4_write_super,
|
786 |
|
|
.sync_fs = ext4_sync_fs,
|
787 |
|
|
.write_super_lockfs = ext4_write_super_lockfs,
|
788 |
|
|
.unlockfs = ext4_unlockfs,
|
789 |
|
|
.statfs = ext4_statfs,
|
790 |
|
|
.remount_fs = ext4_remount,
|
791 |
|
|
.clear_inode = ext4_clear_inode,
|
792 |
|
|
.show_options = ext4_show_options,
|
793 |
|
|
#ifdef CONFIG_QUOTA
|
794 |
|
|
.quota_read = ext4_quota_read,
|
795 |
|
|
.quota_write = ext4_quota_write,
|
796 |
|
|
#endif
|
797 |
|
|
};
|
798 |
|
|
|
799 |
|
|
static const struct export_operations ext4_export_ops = {
|
800 |
|
|
.fh_to_dentry = ext4_fh_to_dentry,
|
801 |
|
|
.fh_to_parent = ext4_fh_to_parent,
|
802 |
|
|
.get_parent = ext4_get_parent,
|
803 |
|
|
};
|
804 |
|
|
|
805 |
|
|
enum {
|
806 |
|
|
Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
|
807 |
|
|
Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
|
808 |
|
|
Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
|
809 |
|
|
Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
|
810 |
|
|
Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
|
811 |
|
|
Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
|
812 |
|
|
Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
|
813 |
|
|
Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
|
814 |
|
|
Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
|
815 |
|
|
Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota,
|
816 |
|
|
Opt_grpquota, Opt_extents, Opt_noextents,
|
817 |
|
|
};
|
818 |
|
|
|
819 |
|
|
static match_table_t tokens = {
|
820 |
|
|
{Opt_bsd_df, "bsddf"},
|
821 |
|
|
{Opt_minix_df, "minixdf"},
|
822 |
|
|
{Opt_grpid, "grpid"},
|
823 |
|
|
{Opt_grpid, "bsdgroups"},
|
824 |
|
|
{Opt_nogrpid, "nogrpid"},
|
825 |
|
|
{Opt_nogrpid, "sysvgroups"},
|
826 |
|
|
{Opt_resgid, "resgid=%u"},
|
827 |
|
|
{Opt_resuid, "resuid=%u"},
|
828 |
|
|
{Opt_sb, "sb=%u"},
|
829 |
|
|
{Opt_err_cont, "errors=continue"},
|
830 |
|
|
{Opt_err_panic, "errors=panic"},
|
831 |
|
|
{Opt_err_ro, "errors=remount-ro"},
|
832 |
|
|
{Opt_nouid32, "nouid32"},
|
833 |
|
|
{Opt_nocheck, "nocheck"},
|
834 |
|
|
{Opt_nocheck, "check=none"},
|
835 |
|
|
{Opt_debug, "debug"},
|
836 |
|
|
{Opt_oldalloc, "oldalloc"},
|
837 |
|
|
{Opt_orlov, "orlov"},
|
838 |
|
|
{Opt_user_xattr, "user_xattr"},
|
839 |
|
|
{Opt_nouser_xattr, "nouser_xattr"},
|
840 |
|
|
{Opt_acl, "acl"},
|
841 |
|
|
{Opt_noacl, "noacl"},
|
842 |
|
|
{Opt_reservation, "reservation"},
|
843 |
|
|
{Opt_noreservation, "noreservation"},
|
844 |
|
|
{Opt_noload, "noload"},
|
845 |
|
|
{Opt_nobh, "nobh"},
|
846 |
|
|
{Opt_bh, "bh"},
|
847 |
|
|
{Opt_commit, "commit=%u"},
|
848 |
|
|
{Opt_journal_update, "journal=update"},
|
849 |
|
|
{Opt_journal_inum, "journal=%u"},
|
850 |
|
|
{Opt_journal_dev, "journal_dev=%u"},
|
851 |
|
|
{Opt_abort, "abort"},
|
852 |
|
|
{Opt_data_journal, "data=journal"},
|
853 |
|
|
{Opt_data_ordered, "data=ordered"},
|
854 |
|
|
{Opt_data_writeback, "data=writeback"},
|
855 |
|
|
{Opt_offusrjquota, "usrjquota="},
|
856 |
|
|
{Opt_usrjquota, "usrjquota=%s"},
|
857 |
|
|
{Opt_offgrpjquota, "grpjquota="},
|
858 |
|
|
{Opt_grpjquota, "grpjquota=%s"},
|
859 |
|
|
{Opt_jqfmt_vfsold, "jqfmt=vfsold"},
|
860 |
|
|
{Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
|
861 |
|
|
{Opt_grpquota, "grpquota"},
|
862 |
|
|
{Opt_noquota, "noquota"},
|
863 |
|
|
{Opt_quota, "quota"},
|
864 |
|
|
{Opt_usrquota, "usrquota"},
|
865 |
|
|
{Opt_barrier, "barrier=%u"},
|
866 |
|
|
{Opt_extents, "extents"},
|
867 |
|
|
{Opt_noextents, "noextents"},
|
868 |
|
|
{Opt_err, NULL},
|
869 |
|
|
{Opt_resize, "resize"},
|
870 |
|
|
};
|
871 |
|
|
|
872 |
|
|
static ext4_fsblk_t get_sb_block(void **data)
|
873 |
|
|
{
|
874 |
|
|
ext4_fsblk_t sb_block;
|
875 |
|
|
char *options = (char *) *data;
|
876 |
|
|
|
877 |
|
|
if (!options || strncmp(options, "sb=", 3) != 0)
|
878 |
|
|
return 1; /* Default location */
|
879 |
|
|
options += 3;
|
880 |
|
|
/*todo: use simple_strtoll with >32bit ext4 */
|
881 |
|
|
sb_block = simple_strtoul(options, &options, 0);
|
882 |
|
|
if (*options && *options != ',') {
|
883 |
|
|
printk("EXT4-fs: Invalid sb specification: %s\n",
|
884 |
|
|
(char *) *data);
|
885 |
|
|
return 1;
|
886 |
|
|
}
|
887 |
|
|
if (*options == ',')
|
888 |
|
|
options++;
|
889 |
|
|
*data = (void *) options;
|
890 |
|
|
return sb_block;
|
891 |
|
|
}
|
892 |
|
|
|
893 |
|
|
static int parse_options (char *options, struct super_block *sb,
|
894 |
|
|
unsigned int *inum, unsigned long *journal_devnum,
|
895 |
|
|
ext4_fsblk_t *n_blocks_count, int is_remount)
|
896 |
|
|
{
|
897 |
|
|
struct ext4_sb_info *sbi = EXT4_SB(sb);
|
898 |
|
|
char * p;
|
899 |
|
|
substring_t args[MAX_OPT_ARGS];
|
900 |
|
|
int data_opt = 0;
|
901 |
|
|
int option;
|
902 |
|
|
#ifdef CONFIG_QUOTA
|
903 |
|
|
int qtype;
|
904 |
|
|
char *qname;
|
905 |
|
|
#endif
|
906 |
|
|
|
907 |
|
|
if (!options)
|
908 |
|
|
return 1;
|
909 |
|
|
|
910 |
|
|
while ((p = strsep (&options, ",")) != NULL) {
|
911 |
|
|
int token;
|
912 |
|
|
if (!*p)
|
913 |
|
|
continue;
|
914 |
|
|
|
915 |
|
|
token = match_token(p, tokens, args);
|
916 |
|
|
switch (token) {
|
917 |
|
|
case Opt_bsd_df:
|
918 |
|
|
clear_opt (sbi->s_mount_opt, MINIX_DF);
|
919 |
|
|
break;
|
920 |
|
|
case Opt_minix_df:
|
921 |
|
|
set_opt (sbi->s_mount_opt, MINIX_DF);
|
922 |
|
|
break;
|
923 |
|
|
case Opt_grpid:
|
924 |
|
|
set_opt (sbi->s_mount_opt, GRPID);
|
925 |
|
|
break;
|
926 |
|
|
case Opt_nogrpid:
|
927 |
|
|
clear_opt (sbi->s_mount_opt, GRPID);
|
928 |
|
|
break;
|
929 |
|
|
case Opt_resuid:
|
930 |
|
|
if (match_int(&args[0], &option))
|
931 |
|
|
return 0;
|
932 |
|
|
sbi->s_resuid = option;
|
933 |
|
|
break;
|
934 |
|
|
case Opt_resgid:
|
935 |
|
|
if (match_int(&args[0], &option))
|
936 |
|
|
return 0;
|
937 |
|
|
sbi->s_resgid = option;
|
938 |
|
|
break;
|
939 |
|
|
case Opt_sb:
|
940 |
|
|
/* handled by get_sb_block() instead of here */
|
941 |
|
|
/* *sb_block = match_int(&args[0]); */
|
942 |
|
|
break;
|
943 |
|
|
case Opt_err_panic:
|
944 |
|
|
clear_opt (sbi->s_mount_opt, ERRORS_CONT);
|
945 |
|
|
clear_opt (sbi->s_mount_opt, ERRORS_RO);
|
946 |
|
|
set_opt (sbi->s_mount_opt, ERRORS_PANIC);
|
947 |
|
|
break;
|
948 |
|
|
case Opt_err_ro:
|
949 |
|
|
clear_opt (sbi->s_mount_opt, ERRORS_CONT);
|
950 |
|
|
clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
|
951 |
|
|
set_opt (sbi->s_mount_opt, ERRORS_RO);
|
952 |
|
|
break;
|
953 |
|
|
case Opt_err_cont:
|
954 |
|
|
clear_opt (sbi->s_mount_opt, ERRORS_RO);
|
955 |
|
|
clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
|
956 |
|
|
set_opt (sbi->s_mount_opt, ERRORS_CONT);
|
957 |
|
|
break;
|
958 |
|
|
case Opt_nouid32:
|
959 |
|
|
set_opt (sbi->s_mount_opt, NO_UID32);
|
960 |
|
|
break;
|
961 |
|
|
case Opt_nocheck:
|
962 |
|
|
clear_opt (sbi->s_mount_opt, CHECK);
|
963 |
|
|
break;
|
964 |
|
|
case Opt_debug:
|
965 |
|
|
set_opt (sbi->s_mount_opt, DEBUG);
|
966 |
|
|
break;
|
967 |
|
|
case Opt_oldalloc:
|
968 |
|
|
set_opt (sbi->s_mount_opt, OLDALLOC);
|
969 |
|
|
break;
|
970 |
|
|
case Opt_orlov:
|
971 |
|
|
clear_opt (sbi->s_mount_opt, OLDALLOC);
|
972 |
|
|
break;
|
973 |
|
|
#ifdef CONFIG_EXT4DEV_FS_XATTR
|
974 |
|
|
case Opt_user_xattr:
|
975 |
|
|
set_opt (sbi->s_mount_opt, XATTR_USER);
|
976 |
|
|
break;
|
977 |
|
|
case Opt_nouser_xattr:
|
978 |
|
|
clear_opt (sbi->s_mount_opt, XATTR_USER);
|
979 |
|
|
break;
|
980 |
|
|
#else
|
981 |
|
|
case Opt_user_xattr:
|
982 |
|
|
case Opt_nouser_xattr:
|
983 |
|
|
printk("EXT4 (no)user_xattr options not supported\n");
|
984 |
|
|
break;
|
985 |
|
|
#endif
|
986 |
|
|
#ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
|
987 |
|
|
case Opt_acl:
|
988 |
|
|
set_opt(sbi->s_mount_opt, POSIX_ACL);
|
989 |
|
|
break;
|
990 |
|
|
case Opt_noacl:
|
991 |
|
|
clear_opt(sbi->s_mount_opt, POSIX_ACL);
|
992 |
|
|
break;
|
993 |
|
|
#else
|
994 |
|
|
case Opt_acl:
|
995 |
|
|
case Opt_noacl:
|
996 |
|
|
printk("EXT4 (no)acl options not supported\n");
|
997 |
|
|
break;
|
998 |
|
|
#endif
|
999 |
|
|
case Opt_reservation:
|
1000 |
|
|
set_opt(sbi->s_mount_opt, RESERVATION);
|
1001 |
|
|
break;
|
1002 |
|
|
case Opt_noreservation:
|
1003 |
|
|
clear_opt(sbi->s_mount_opt, RESERVATION);
|
1004 |
|
|
break;
|
1005 |
|
|
case Opt_journal_update:
|
1006 |
|
|
/* @@@ FIXME */
|
1007 |
|
|
/* Eventually we will want to be able to create
|
1008 |
|
|
a journal file here. For now, only allow the
|
1009 |
|
|
user to specify an existing inode to be the
|
1010 |
|
|
journal file. */
|
1011 |
|
|
if (is_remount) {
|
1012 |
|
|
printk(KERN_ERR "EXT4-fs: cannot specify "
|
1013 |
|
|
"journal on remount\n");
|
1014 |
|
|
return 0;
|
1015 |
|
|
}
|
1016 |
|
|
set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
|
1017 |
|
|
break;
|
1018 |
|
|
case Opt_journal_inum:
|
1019 |
|
|
if (is_remount) {
|
1020 |
|
|
printk(KERN_ERR "EXT4-fs: cannot specify "
|
1021 |
|
|
"journal on remount\n");
|
1022 |
|
|
return 0;
|
1023 |
|
|
}
|
1024 |
|
|
if (match_int(&args[0], &option))
|
1025 |
|
|
return 0;
|
1026 |
|
|
*inum = option;
|
1027 |
|
|
break;
|
1028 |
|
|
case Opt_journal_dev:
|
1029 |
|
|
if (is_remount) {
|
1030 |
|
|
printk(KERN_ERR "EXT4-fs: cannot specify "
|
1031 |
|
|
"journal on remount\n");
|
1032 |
|
|
return 0;
|
1033 |
|
|
}
|
1034 |
|
|
if (match_int(&args[0], &option))
|
1035 |
|
|
return 0;
|
1036 |
|
|
*journal_devnum = option;
|
1037 |
|
|
break;
|
1038 |
|
|
case Opt_noload:
|
1039 |
|
|
set_opt (sbi->s_mount_opt, NOLOAD);
|
1040 |
|
|
break;
|
1041 |
|
|
case Opt_commit:
|
1042 |
|
|
if (match_int(&args[0], &option))
|
1043 |
|
|
return 0;
|
1044 |
|
|
if (option < 0)
|
1045 |
|
|
return 0;
|
1046 |
|
|
if (option == 0)
|
1047 |
|
|
option = JBD2_DEFAULT_MAX_COMMIT_AGE;
|
1048 |
|
|
sbi->s_commit_interval = HZ * option;
|
1049 |
|
|
break;
|
1050 |
|
|
case Opt_data_journal:
|
1051 |
|
|
data_opt = EXT4_MOUNT_JOURNAL_DATA;
|
1052 |
|
|
goto datacheck;
|
1053 |
|
|
case Opt_data_ordered:
|
1054 |
|
|
data_opt = EXT4_MOUNT_ORDERED_DATA;
|
1055 |
|
|
goto datacheck;
|
1056 |
|
|
case Opt_data_writeback:
|
1057 |
|
|
data_opt = EXT4_MOUNT_WRITEBACK_DATA;
|
1058 |
|
|
datacheck:
|
1059 |
|
|
if (is_remount) {
|
1060 |
|
|
if ((sbi->s_mount_opt & EXT4_MOUNT_DATA_FLAGS)
|
1061 |
|
|
!= data_opt) {
|
1062 |
|
|
printk(KERN_ERR
|
1063 |
|
|
"EXT4-fs: cannot change data "
|
1064 |
|
|
"mode on remount\n");
|
1065 |
|
|
return 0;
|
1066 |
|
|
}
|
1067 |
|
|
} else {
|
1068 |
|
|
sbi->s_mount_opt &= ~EXT4_MOUNT_DATA_FLAGS;
|
1069 |
|
|
sbi->s_mount_opt |= data_opt;
|
1070 |
|
|
}
|
1071 |
|
|
break;
|
1072 |
|
|
#ifdef CONFIG_QUOTA
|
1073 |
|
|
case Opt_usrjquota:
|
1074 |
|
|
qtype = USRQUOTA;
|
1075 |
|
|
goto set_qf_name;
|
1076 |
|
|
case Opt_grpjquota:
|
1077 |
|
|
qtype = GRPQUOTA;
|
1078 |
|
|
set_qf_name:
|
1079 |
|
|
if (sb_any_quota_enabled(sb)) {
|
1080 |
|
|
printk(KERN_ERR
|
1081 |
|
|
"EXT4-fs: Cannot change journalled "
|
1082 |
|
|
"quota options when quota turned on.\n");
|
1083 |
|
|
return 0;
|
1084 |
|
|
}
|
1085 |
|
|
qname = match_strdup(&args[0]);
|
1086 |
|
|
if (!qname) {
|
1087 |
|
|
printk(KERN_ERR
|
1088 |
|
|
"EXT4-fs: not enough memory for "
|
1089 |
|
|
"storing quotafile name.\n");
|
1090 |
|
|
return 0;
|
1091 |
|
|
}
|
1092 |
|
|
if (sbi->s_qf_names[qtype] &&
|
1093 |
|
|
strcmp(sbi->s_qf_names[qtype], qname)) {
|
1094 |
|
|
printk(KERN_ERR
|
1095 |
|
|
"EXT4-fs: %s quota file already "
|
1096 |
|
|
"specified.\n", QTYPE2NAME(qtype));
|
1097 |
|
|
kfree(qname);
|
1098 |
|
|
return 0;
|
1099 |
|
|
}
|
1100 |
|
|
sbi->s_qf_names[qtype] = qname;
|
1101 |
|
|
if (strchr(sbi->s_qf_names[qtype], '/')) {
|
1102 |
|
|
printk(KERN_ERR
|
1103 |
|
|
"EXT4-fs: quotafile must be on "
|
1104 |
|
|
"filesystem root.\n");
|
1105 |
|
|
kfree(sbi->s_qf_names[qtype]);
|
1106 |
|
|
sbi->s_qf_names[qtype] = NULL;
|
1107 |
|
|
return 0;
|
1108 |
|
|
}
|
1109 |
|
|
set_opt(sbi->s_mount_opt, QUOTA);
|
1110 |
|
|
break;
|
1111 |
|
|
case Opt_offusrjquota:
|
1112 |
|
|
qtype = USRQUOTA;
|
1113 |
|
|
goto clear_qf_name;
|
1114 |
|
|
case Opt_offgrpjquota:
|
1115 |
|
|
qtype = GRPQUOTA;
|
1116 |
|
|
clear_qf_name:
|
1117 |
|
|
if (sb_any_quota_enabled(sb)) {
|
1118 |
|
|
printk(KERN_ERR "EXT4-fs: Cannot change "
|
1119 |
|
|
"journalled quota options when "
|
1120 |
|
|
"quota turned on.\n");
|
1121 |
|
|
return 0;
|
1122 |
|
|
}
|
1123 |
|
|
/*
|
1124 |
|
|
* The space will be released later when all options
|
1125 |
|
|
* are confirmed to be correct
|
1126 |
|
|
*/
|
1127 |
|
|
sbi->s_qf_names[qtype] = NULL;
|
1128 |
|
|
break;
|
1129 |
|
|
case Opt_jqfmt_vfsold:
|
1130 |
|
|
sbi->s_jquota_fmt = QFMT_VFS_OLD;
|
1131 |
|
|
break;
|
1132 |
|
|
case Opt_jqfmt_vfsv0:
|
1133 |
|
|
sbi->s_jquota_fmt = QFMT_VFS_V0;
|
1134 |
|
|
break;
|
1135 |
|
|
case Opt_quota:
|
1136 |
|
|
case Opt_usrquota:
|
1137 |
|
|
set_opt(sbi->s_mount_opt, QUOTA);
|
1138 |
|
|
set_opt(sbi->s_mount_opt, USRQUOTA);
|
1139 |
|
|
break;
|
1140 |
|
|
case Opt_grpquota:
|
1141 |
|
|
set_opt(sbi->s_mount_opt, QUOTA);
|
1142 |
|
|
set_opt(sbi->s_mount_opt, GRPQUOTA);
|
1143 |
|
|
break;
|
1144 |
|
|
case Opt_noquota:
|
1145 |
|
|
if (sb_any_quota_enabled(sb)) {
|
1146 |
|
|
printk(KERN_ERR "EXT4-fs: Cannot change quota "
|
1147 |
|
|
"options when quota turned on.\n");
|
1148 |
|
|
return 0;
|
1149 |
|
|
}
|
1150 |
|
|
clear_opt(sbi->s_mount_opt, QUOTA);
|
1151 |
|
|
clear_opt(sbi->s_mount_opt, USRQUOTA);
|
1152 |
|
|
clear_opt(sbi->s_mount_opt, GRPQUOTA);
|
1153 |
|
|
break;
|
1154 |
|
|
#else
|
1155 |
|
|
case Opt_quota:
|
1156 |
|
|
case Opt_usrquota:
|
1157 |
|
|
case Opt_grpquota:
|
1158 |
|
|
case Opt_usrjquota:
|
1159 |
|
|
case Opt_grpjquota:
|
1160 |
|
|
case Opt_offusrjquota:
|
1161 |
|
|
case Opt_offgrpjquota:
|
1162 |
|
|
case Opt_jqfmt_vfsold:
|
1163 |
|
|
case Opt_jqfmt_vfsv0:
|
1164 |
|
|
printk(KERN_ERR
|
1165 |
|
|
"EXT4-fs: journalled quota options not "
|
1166 |
|
|
"supported.\n");
|
1167 |
|
|
break;
|
1168 |
|
|
case Opt_noquota:
|
1169 |
|
|
break;
|
1170 |
|
|
#endif
|
1171 |
|
|
case Opt_abort:
|
1172 |
|
|
set_opt(sbi->s_mount_opt, ABORT);
|
1173 |
|
|
break;
|
1174 |
|
|
case Opt_barrier:
|
1175 |
|
|
if (match_int(&args[0], &option))
|
1176 |
|
|
return 0;
|
1177 |
|
|
if (option)
|
1178 |
|
|
set_opt(sbi->s_mount_opt, BARRIER);
|
1179 |
|
|
else
|
1180 |
|
|
clear_opt(sbi->s_mount_opt, BARRIER);
|
1181 |
|
|
break;
|
1182 |
|
|
case Opt_ignore:
|
1183 |
|
|
break;
|
1184 |
|
|
case Opt_resize:
|
1185 |
|
|
if (!is_remount) {
|
1186 |
|
|
printk("EXT4-fs: resize option only available "
|
1187 |
|
|
"for remount\n");
|
1188 |
|
|
return 0;
|
1189 |
|
|
}
|
1190 |
|
|
if (match_int(&args[0], &option) != 0)
|
1191 |
|
|
return 0;
|
1192 |
|
|
*n_blocks_count = option;
|
1193 |
|
|
break;
|
1194 |
|
|
case Opt_nobh:
|
1195 |
|
|
set_opt(sbi->s_mount_opt, NOBH);
|
1196 |
|
|
break;
|
1197 |
|
|
case Opt_bh:
|
1198 |
|
|
clear_opt(sbi->s_mount_opt, NOBH);
|
1199 |
|
|
break;
|
1200 |
|
|
case Opt_extents:
|
1201 |
|
|
set_opt (sbi->s_mount_opt, EXTENTS);
|
1202 |
|
|
break;
|
1203 |
|
|
case Opt_noextents:
|
1204 |
|
|
clear_opt (sbi->s_mount_opt, EXTENTS);
|
1205 |
|
|
break;
|
1206 |
|
|
default:
|
1207 |
|
|
printk (KERN_ERR
|
1208 |
|
|
"EXT4-fs: Unrecognized mount option \"%s\" "
|
1209 |
|
|
"or missing value\n", p);
|
1210 |
|
|
return 0;
|
1211 |
|
|
}
|
1212 |
|
|
}
|
1213 |
|
|
#ifdef CONFIG_QUOTA
|
1214 |
|
|
if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
|
1215 |
|
|
if ((sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA) &&
|
1216 |
|
|
sbi->s_qf_names[USRQUOTA])
|
1217 |
|
|
clear_opt(sbi->s_mount_opt, USRQUOTA);
|
1218 |
|
|
|
1219 |
|
|
if ((sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA) &&
|
1220 |
|
|
sbi->s_qf_names[GRPQUOTA])
|
1221 |
|
|
clear_opt(sbi->s_mount_opt, GRPQUOTA);
|
1222 |
|
|
|
1223 |
|
|
if ((sbi->s_qf_names[USRQUOTA] &&
|
1224 |
|
|
(sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)) ||
|
1225 |
|
|
(sbi->s_qf_names[GRPQUOTA] &&
|
1226 |
|
|
(sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA))) {
|
1227 |
|
|
printk(KERN_ERR "EXT4-fs: old and new quota "
|
1228 |
|
|
"format mixing.\n");
|
1229 |
|
|
return 0;
|
1230 |
|
|
}
|
1231 |
|
|
|
1232 |
|
|
if (!sbi->s_jquota_fmt) {
|
1233 |
|
|
printk(KERN_ERR "EXT4-fs: journalled quota format "
|
1234 |
|
|
"not specified.\n");
|
1235 |
|
|
return 0;
|
1236 |
|
|
}
|
1237 |
|
|
} else {
|
1238 |
|
|
if (sbi->s_jquota_fmt) {
|
1239 |
|
|
printk(KERN_ERR "EXT4-fs: journalled quota format "
|
1240 |
|
|
"specified with no journalling "
|
1241 |
|
|
"enabled.\n");
|
1242 |
|
|
return 0;
|
1243 |
|
|
}
|
1244 |
|
|
}
|
1245 |
|
|
#endif
|
1246 |
|
|
return 1;
|
1247 |
|
|
}
|
1248 |
|
|
|
1249 |
|
|
static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
|
1250 |
|
|
int read_only)
|
1251 |
|
|
{
|
1252 |
|
|
struct ext4_sb_info *sbi = EXT4_SB(sb);
|
1253 |
|
|
int res = 0;
|
1254 |
|
|
|
1255 |
|
|
if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
|
1256 |
|
|
printk (KERN_ERR "EXT4-fs warning: revision level too high, "
|
1257 |
|
|
"forcing read-only mode\n");
|
1258 |
|
|
res = MS_RDONLY;
|
1259 |
|
|
}
|
1260 |
|
|
if (read_only)
|
1261 |
|
|
return res;
|
1262 |
|
|
if (!(sbi->s_mount_state & EXT4_VALID_FS))
|
1263 |
|
|
printk (KERN_WARNING "EXT4-fs warning: mounting unchecked fs, "
|
1264 |
|
|
"running e2fsck is recommended\n");
|
1265 |
|
|
else if ((sbi->s_mount_state & EXT4_ERROR_FS))
|
1266 |
|
|
printk (KERN_WARNING
|
1267 |
|
|
"EXT4-fs warning: mounting fs with errors, "
|
1268 |
|
|
"running e2fsck is recommended\n");
|
1269 |
|
|
else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
|
1270 |
|
|
le16_to_cpu(es->s_mnt_count) >=
|
1271 |
|
|
(unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
|
1272 |
|
|
printk (KERN_WARNING
|
1273 |
|
|
"EXT4-fs warning: maximal mount count reached, "
|
1274 |
|
|
"running e2fsck is recommended\n");
|
1275 |
|
|
else if (le32_to_cpu(es->s_checkinterval) &&
|
1276 |
|
|
(le32_to_cpu(es->s_lastcheck) +
|
1277 |
|
|
le32_to_cpu(es->s_checkinterval) <= get_seconds()))
|
1278 |
|
|
printk (KERN_WARNING
|
1279 |
|
|
"EXT4-fs warning: checktime reached, "
|
1280 |
|
|
"running e2fsck is recommended\n");
|
1281 |
|
|
#if 0
|
1282 |
|
|
/* @@@ We _will_ want to clear the valid bit if we find
|
1283 |
|
|
* inconsistencies, to force a fsck at reboot. But for
|
1284 |
|
|
* a plain journaled filesystem we can keep it set as
|
1285 |
|
|
* valid forever! :)
|
1286 |
|
|
*/
|
1287 |
|
|
es->s_state = cpu_to_le16(le16_to_cpu(es->s_state) & ~EXT4_VALID_FS);
|
1288 |
|
|
#endif
|
1289 |
|
|
if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
|
1290 |
|
|
es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
|
1291 |
|
|
es->s_mnt_count=cpu_to_le16(le16_to_cpu(es->s_mnt_count) + 1);
|
1292 |
|
|
es->s_mtime = cpu_to_le32(get_seconds());
|
1293 |
|
|
ext4_update_dynamic_rev(sb);
|
1294 |
|
|
EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
|
1295 |
|
|
|
1296 |
|
|
ext4_commit_super(sb, es, 1);
|
1297 |
|
|
if (test_opt(sb, DEBUG))
|
1298 |
|
|
printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%lu, "
|
1299 |
|
|
"bpg=%lu, ipg=%lu, mo=%04lx]\n",
|
1300 |
|
|
sb->s_blocksize,
|
1301 |
|
|
sbi->s_groups_count,
|
1302 |
|
|
EXT4_BLOCKS_PER_GROUP(sb),
|
1303 |
|
|
EXT4_INODES_PER_GROUP(sb),
|
1304 |
|
|
sbi->s_mount_opt);
|
1305 |
|
|
|
1306 |
|
|
printk(KERN_INFO "EXT4 FS on %s, ", sb->s_id);
|
1307 |
|
|
if (EXT4_SB(sb)->s_journal->j_inode == NULL) {
|
1308 |
|
|
char b[BDEVNAME_SIZE];
|
1309 |
|
|
|
1310 |
|
|
printk("external journal on %s\n",
|
1311 |
|
|
bdevname(EXT4_SB(sb)->s_journal->j_dev, b));
|
1312 |
|
|
} else {
|
1313 |
|
|
printk("internal journal\n");
|
1314 |
|
|
}
|
1315 |
|
|
return res;
|
1316 |
|
|
}
|
1317 |
|
|
|
1318 |
|
|
__le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
|
1319 |
|
|
struct ext4_group_desc *gdp)
|
1320 |
|
|
{
|
1321 |
|
|
__u16 crc = 0;
|
1322 |
|
|
|
1323 |
|
|
if (sbi->s_es->s_feature_ro_compat &
|
1324 |
|
|
cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) {
|
1325 |
|
|
int offset = offsetof(struct ext4_group_desc, bg_checksum);
|
1326 |
|
|
__le32 le_group = cpu_to_le32(block_group);
|
1327 |
|
|
|
1328 |
|
|
crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
|
1329 |
|
|
crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
|
1330 |
|
|
crc = crc16(crc, (__u8 *)gdp, offset);
|
1331 |
|
|
offset += sizeof(gdp->bg_checksum); /* skip checksum */
|
1332 |
|
|
/* for checksum of struct ext4_group_desc do the rest...*/
|
1333 |
|
|
if ((sbi->s_es->s_feature_incompat &
|
1334 |
|
|
cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
|
1335 |
|
|
offset < le16_to_cpu(sbi->s_es->s_desc_size))
|
1336 |
|
|
crc = crc16(crc, (__u8 *)gdp + offset,
|
1337 |
|
|
le16_to_cpu(sbi->s_es->s_desc_size) -
|
1338 |
|
|
offset);
|
1339 |
|
|
}
|
1340 |
|
|
|
1341 |
|
|
return cpu_to_le16(crc);
|
1342 |
|
|
}
|
1343 |
|
|
|
1344 |
|
|
int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 block_group,
|
1345 |
|
|
struct ext4_group_desc *gdp)
|
1346 |
|
|
{
|
1347 |
|
|
if ((sbi->s_es->s_feature_ro_compat &
|
1348 |
|
|
cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) &&
|
1349 |
|
|
(gdp->bg_checksum != ext4_group_desc_csum(sbi, block_group, gdp)))
|
1350 |
|
|
return 0;
|
1351 |
|
|
|
1352 |
|
|
return 1;
|
1353 |
|
|
}
|
1354 |
|
|
|
1355 |
|
|
/* Called at mount-time, super-block is locked */
|
1356 |
|
|
static int ext4_check_descriptors (struct super_block * sb)
|
1357 |
|
|
{
|
1358 |
|
|
struct ext4_sb_info *sbi = EXT4_SB(sb);
|
1359 |
|
|
ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
|
1360 |
|
|
ext4_fsblk_t last_block;
|
1361 |
|
|
ext4_fsblk_t block_bitmap;
|
1362 |
|
|
ext4_fsblk_t inode_bitmap;
|
1363 |
|
|
ext4_fsblk_t inode_table;
|
1364 |
|
|
struct ext4_group_desc * gdp = NULL;
|
1365 |
|
|
int desc_block = 0;
|
1366 |
|
|
int flexbg_flag = 0;
|
1367 |
|
|
int i;
|
1368 |
|
|
|
1369 |
|
|
if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
|
1370 |
|
|
flexbg_flag = 1;
|
1371 |
|
|
|
1372 |
|
|
ext4_debug ("Checking group descriptors");
|
1373 |
|
|
|
1374 |
|
|
for (i = 0; i < sbi->s_groups_count; i++)
|
1375 |
|
|
{
|
1376 |
|
|
if (i == sbi->s_groups_count - 1 || flexbg_flag)
|
1377 |
|
|
last_block = ext4_blocks_count(sbi->s_es) - 1;
|
1378 |
|
|
else
|
1379 |
|
|
last_block = first_block +
|
1380 |
|
|
(EXT4_BLOCKS_PER_GROUP(sb) - 1);
|
1381 |
|
|
|
1382 |
|
|
if ((i % EXT4_DESC_PER_BLOCK(sb)) == 0)
|
1383 |
|
|
gdp = (struct ext4_group_desc *)
|
1384 |
|
|
sbi->s_group_desc[desc_block++]->b_data;
|
1385 |
|
|
block_bitmap = ext4_block_bitmap(sb, gdp);
|
1386 |
|
|
if (block_bitmap < first_block || block_bitmap > last_block)
|
1387 |
|
|
{
|
1388 |
|
|
ext4_error (sb, "ext4_check_descriptors",
|
1389 |
|
|
"Block bitmap for group %d"
|
1390 |
|
|
" not in group (block %llu)!",
|
1391 |
|
|
i, block_bitmap);
|
1392 |
|
|
return 0;
|
1393 |
|
|
}
|
1394 |
|
|
inode_bitmap = ext4_inode_bitmap(sb, gdp);
|
1395 |
|
|
if (inode_bitmap < first_block || inode_bitmap > last_block)
|
1396 |
|
|
{
|
1397 |
|
|
ext4_error (sb, "ext4_check_descriptors",
|
1398 |
|
|
"Inode bitmap for group %d"
|
1399 |
|
|
" not in group (block %llu)!",
|
1400 |
|
|
i, inode_bitmap);
|
1401 |
|
|
return 0;
|
1402 |
|
|
}
|
1403 |
|
|
inode_table = ext4_inode_table(sb, gdp);
|
1404 |
|
|
if (inode_table < first_block ||
|
1405 |
|
|
inode_table + sbi->s_itb_per_group - 1 > last_block)
|
1406 |
|
|
{
|
1407 |
|
|
ext4_error (sb, "ext4_check_descriptors",
|
1408 |
|
|
"Inode table for group %d"
|
1409 |
|
|
" not in group (block %llu)!",
|
1410 |
|
|
i, inode_table);
|
1411 |
|
|
return 0;
|
1412 |
|
|
}
|
1413 |
|
|
if (!ext4_group_desc_csum_verify(sbi, i, gdp)) {
|
1414 |
|
|
ext4_error(sb, __FUNCTION__,
|
1415 |
|
|
"Checksum for group %d failed (%u!=%u)\n", i,
|
1416 |
|
|
le16_to_cpu(ext4_group_desc_csum(sbi, i,
|
1417 |
|
|
gdp)),
|
1418 |
|
|
le16_to_cpu(gdp->bg_checksum));
|
1419 |
|
|
return 0;
|
1420 |
|
|
}
|
1421 |
|
|
if (!flexbg_flag)
|
1422 |
|
|
first_block += EXT4_BLOCKS_PER_GROUP(sb);
|
1423 |
|
|
gdp = (struct ext4_group_desc *)
|
1424 |
|
|
((__u8 *)gdp + EXT4_DESC_SIZE(sb));
|
1425 |
|
|
}
|
1426 |
|
|
|
1427 |
|
|
ext4_free_blocks_count_set(sbi->s_es, ext4_count_free_blocks(sb));
|
1428 |
|
|
sbi->s_es->s_free_inodes_count=cpu_to_le32(ext4_count_free_inodes(sb));
|
1429 |
|
|
return 1;
|
1430 |
|
|
}
|
1431 |
|
|
|
1432 |
|
|
|
1433 |
|
|
/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
|
1434 |
|
|
* the superblock) which were deleted from all directories, but held open by
|
1435 |
|
|
* a process at the time of a crash. We walk the list and try to delete these
|
1436 |
|
|
* inodes at recovery time (only with a read-write filesystem).
|
1437 |
|
|
*
|
1438 |
|
|
* In order to keep the orphan inode chain consistent during traversal (in
|
1439 |
|
|
* case of crash during recovery), we link each inode into the superblock
|
1440 |
|
|
* orphan list_head and handle it the same way as an inode deletion during
|
1441 |
|
|
* normal operation (which journals the operations for us).
|
1442 |
|
|
*
|
1443 |
|
|
* We only do an iget() and an iput() on each inode, which is very safe if we
|
1444 |
|
|
* accidentally point at an in-use or already deleted inode. The worst that
|
1445 |
|
|
* can happen in this case is that we get a "bit already cleared" message from
|
1446 |
|
|
* ext4_free_inode(). The only reason we would point at a wrong inode is if
|
1447 |
|
|
* e2fsck was run on this filesystem, and it must have already done the orphan
|
1448 |
|
|
* inode cleanup for us, so we can safely abort without any further action.
|
1449 |
|
|
*/
|
1450 |
|
|
static void ext4_orphan_cleanup (struct super_block * sb,
|
1451 |
|
|
struct ext4_super_block * es)
|
1452 |
|
|
{
|
1453 |
|
|
unsigned int s_flags = sb->s_flags;
|
1454 |
|
|
int nr_orphans = 0, nr_truncates = 0;
|
1455 |
|
|
#ifdef CONFIG_QUOTA
|
1456 |
|
|
int i;
|
1457 |
|
|
#endif
|
1458 |
|
|
if (!es->s_last_orphan) {
|
1459 |
|
|
jbd_debug(4, "no orphan inodes to clean up\n");
|
1460 |
|
|
return;
|
1461 |
|
|
}
|
1462 |
|
|
|
1463 |
|
|
if (bdev_read_only(sb->s_bdev)) {
|
1464 |
|
|
printk(KERN_ERR "EXT4-fs: write access "
|
1465 |
|
|
"unavailable, skipping orphan cleanup.\n");
|
1466 |
|
|
return;
|
1467 |
|
|
}
|
1468 |
|
|
|
1469 |
|
|
if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
|
1470 |
|
|
if (es->s_last_orphan)
|
1471 |
|
|
jbd_debug(1, "Errors on filesystem, "
|
1472 |
|
|
"clearing orphan list.\n");
|
1473 |
|
|
es->s_last_orphan = 0;
|
1474 |
|
|
jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
|
1475 |
|
|
return;
|
1476 |
|
|
}
|
1477 |
|
|
|
1478 |
|
|
if (s_flags & MS_RDONLY) {
|
1479 |
|
|
printk(KERN_INFO "EXT4-fs: %s: orphan cleanup on readonly fs\n",
|
1480 |
|
|
sb->s_id);
|
1481 |
|
|
sb->s_flags &= ~MS_RDONLY;
|
1482 |
|
|
}
|
1483 |
|
|
#ifdef CONFIG_QUOTA
|
1484 |
|
|
/* Needed for iput() to work correctly and not trash data */
|
1485 |
|
|
sb->s_flags |= MS_ACTIVE;
|
1486 |
|
|
/* Turn on quotas so that they are updated correctly */
|
1487 |
|
|
for (i = 0; i < MAXQUOTAS; i++) {
|
1488 |
|
|
if (EXT4_SB(sb)->s_qf_names[i]) {
|
1489 |
|
|
int ret = ext4_quota_on_mount(sb, i);
|
1490 |
|
|
if (ret < 0)
|
1491 |
|
|
printk(KERN_ERR
|
1492 |
|
|
"EXT4-fs: Cannot turn on journalled "
|
1493 |
|
|
"quota: error %d\n", ret);
|
1494 |
|
|
}
|
1495 |
|
|
}
|
1496 |
|
|
#endif
|
1497 |
|
|
|
1498 |
|
|
while (es->s_last_orphan) {
|
1499 |
|
|
struct inode *inode;
|
1500 |
|
|
|
1501 |
|
|
if (!(inode =
|
1502 |
|
|
ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan)))) {
|
1503 |
|
|
es->s_last_orphan = 0;
|
1504 |
|
|
break;
|
1505 |
|
|
}
|
1506 |
|
|
|
1507 |
|
|
list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
|
1508 |
|
|
DQUOT_INIT(inode);
|
1509 |
|
|
if (inode->i_nlink) {
|
1510 |
|
|
printk(KERN_DEBUG
|
1511 |
|
|
"%s: truncating inode %lu to %Ld bytes\n",
|
1512 |
|
|
__FUNCTION__, inode->i_ino, inode->i_size);
|
1513 |
|
|
jbd_debug(2, "truncating inode %lu to %Ld bytes\n",
|
1514 |
|
|
inode->i_ino, inode->i_size);
|
1515 |
|
|
ext4_truncate(inode);
|
1516 |
|
|
nr_truncates++;
|
1517 |
|
|
} else {
|
1518 |
|
|
printk(KERN_DEBUG
|
1519 |
|
|
"%s: deleting unreferenced inode %lu\n",
|
1520 |
|
|
__FUNCTION__, inode->i_ino);
|
1521 |
|
|
jbd_debug(2, "deleting unreferenced inode %lu\n",
|
1522 |
|
|
inode->i_ino);
|
1523 |
|
|
nr_orphans++;
|
1524 |
|
|
}
|
1525 |
|
|
iput(inode); /* The delete magic happens here! */
|
1526 |
|
|
}
|
1527 |
|
|
|
1528 |
|
|
#define PLURAL(x) (x), ((x)==1) ? "" : "s"
|
1529 |
|
|
|
1530 |
|
|
if (nr_orphans)
|
1531 |
|
|
printk(KERN_INFO "EXT4-fs: %s: %d orphan inode%s deleted\n",
|
1532 |
|
|
sb->s_id, PLURAL(nr_orphans));
|
1533 |
|
|
if (nr_truncates)
|
1534 |
|
|
printk(KERN_INFO "EXT4-fs: %s: %d truncate%s cleaned up\n",
|
1535 |
|
|
sb->s_id, PLURAL(nr_truncates));
|
1536 |
|
|
#ifdef CONFIG_QUOTA
|
1537 |
|
|
/* Turn quotas off */
|
1538 |
|
|
for (i = 0; i < MAXQUOTAS; i++) {
|
1539 |
|
|
if (sb_dqopt(sb)->files[i])
|
1540 |
|
|
vfs_quota_off(sb, i);
|
1541 |
|
|
}
|
1542 |
|
|
#endif
|
1543 |
|
|
sb->s_flags = s_flags; /* Restore MS_RDONLY status */
|
1544 |
|
|
}
|
1545 |
|
|
|
1546 |
|
|
/*
|
1547 |
|
|
* Maximal file size. There is a direct, and {,double-,triple-}indirect
|
1548 |
|
|
* block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
|
1549 |
|
|
* We need to be 1 filesystem block less than the 2^32 sector limit.
|
1550 |
|
|
*/
|
1551 |
|
|
static loff_t ext4_max_size(int bits)
|
1552 |
|
|
{
|
1553 |
|
|
loff_t res = EXT4_NDIR_BLOCKS;
|
1554 |
|
|
/* This constant is calculated to be the largest file size for a
|
1555 |
|
|
* dense, 4k-blocksize file such that the total number of
|
1556 |
|
|
* sectors in the file, including data and all indirect blocks,
|
1557 |
|
|
* does not exceed 2^32. */
|
1558 |
|
|
const loff_t upper_limit = 0x1ff7fffd000LL;
|
1559 |
|
|
|
1560 |
|
|
res += 1LL << (bits-2);
|
1561 |
|
|
res += 1LL << (2*(bits-2));
|
1562 |
|
|
res += 1LL << (3*(bits-2));
|
1563 |
|
|
res <<= bits;
|
1564 |
|
|
if (res > upper_limit)
|
1565 |
|
|
res = upper_limit;
|
1566 |
|
|
return res;
|
1567 |
|
|
}
|
1568 |
|
|
|
1569 |
|
|
static ext4_fsblk_t descriptor_loc(struct super_block *sb,
|
1570 |
|
|
ext4_fsblk_t logical_sb_block, int nr)
|
1571 |
|
|
{
|
1572 |
|
|
struct ext4_sb_info *sbi = EXT4_SB(sb);
|
1573 |
|
|
unsigned long bg, first_meta_bg;
|
1574 |
|
|
int has_super = 0;
|
1575 |
|
|
|
1576 |
|
|
first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
|
1577 |
|
|
|
1578 |
|
|
if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
|
1579 |
|
|
nr < first_meta_bg)
|
1580 |
|
|
return logical_sb_block + nr + 1;
|
1581 |
|
|
bg = sbi->s_desc_per_block * nr;
|
1582 |
|
|
if (ext4_bg_has_super(sb, bg))
|
1583 |
|
|
has_super = 1;
|
1584 |
|
|
return (has_super + ext4_group_first_block_no(sb, bg));
|
1585 |
|
|
}
|
1586 |
|
|
|
1587 |
|
|
|
1588 |
|
|
static int ext4_fill_super (struct super_block *sb, void *data, int silent)
|
1589 |
|
|
{
|
1590 |
|
|
struct buffer_head * bh;
|
1591 |
|
|
struct ext4_super_block *es = NULL;
|
1592 |
|
|
struct ext4_sb_info *sbi;
|
1593 |
|
|
ext4_fsblk_t block;
|
1594 |
|
|
ext4_fsblk_t sb_block = get_sb_block(&data);
|
1595 |
|
|
ext4_fsblk_t logical_sb_block;
|
1596 |
|
|
unsigned long offset = 0;
|
1597 |
|
|
unsigned int journal_inum = 0;
|
1598 |
|
|
unsigned long journal_devnum = 0;
|
1599 |
|
|
unsigned long def_mount_opts;
|
1600 |
|
|
struct inode *root;
|
1601 |
|
|
int blocksize;
|
1602 |
|
|
int hblock;
|
1603 |
|
|
int db_count;
|
1604 |
|
|
int i;
|
1605 |
|
|
int needs_recovery;
|
1606 |
|
|
__le32 features;
|
1607 |
|
|
__u64 blocks_count;
|
1608 |
|
|
int err;
|
1609 |
|
|
|
1610 |
|
|
sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
|
1611 |
|
|
if (!sbi)
|
1612 |
|
|
return -ENOMEM;
|
1613 |
|
|
sb->s_fs_info = sbi;
|
1614 |
|
|
sbi->s_mount_opt = 0;
|
1615 |
|
|
sbi->s_resuid = EXT4_DEF_RESUID;
|
1616 |
|
|
sbi->s_resgid = EXT4_DEF_RESGID;
|
1617 |
|
|
sbi->s_sb_block = sb_block;
|
1618 |
|
|
|
1619 |
|
|
unlock_kernel();
|
1620 |
|
|
|
1621 |
|
|
blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
|
1622 |
|
|
if (!blocksize) {
|
1623 |
|
|
printk(KERN_ERR "EXT4-fs: unable to set blocksize\n");
|
1624 |
|
|
goto out_fail;
|
1625 |
|
|
}
|
1626 |
|
|
|
1627 |
|
|
/*
|
1628 |
|
|
* The ext4 superblock will not be buffer aligned for other than 1kB
|
1629 |
|
|
* block sizes. We need to calculate the offset from buffer start.
|
1630 |
|
|
*/
|
1631 |
|
|
if (blocksize != EXT4_MIN_BLOCK_SIZE) {
|
1632 |
|
|
logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
|
1633 |
|
|
offset = do_div(logical_sb_block, blocksize);
|
1634 |
|
|
} else {
|
1635 |
|
|
logical_sb_block = sb_block;
|
1636 |
|
|
}
|
1637 |
|
|
|
1638 |
|
|
if (!(bh = sb_bread(sb, logical_sb_block))) {
|
1639 |
|
|
printk (KERN_ERR "EXT4-fs: unable to read superblock\n");
|
1640 |
|
|
goto out_fail;
|
1641 |
|
|
}
|
1642 |
|
|
/*
|
1643 |
|
|
* Note: s_es must be initialized as soon as possible because
|
1644 |
|
|
* some ext4 macro-instructions depend on its value
|
1645 |
|
|
*/
|
1646 |
|
|
es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
|
1647 |
|
|
sbi->s_es = es;
|
1648 |
|
|
sb->s_magic = le16_to_cpu(es->s_magic);
|
1649 |
|
|
if (sb->s_magic != EXT4_SUPER_MAGIC)
|
1650 |
|
|
goto cantfind_ext4;
|
1651 |
|
|
|
1652 |
|
|
/* Set defaults before we parse the mount options */
|
1653 |
|
|
def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
|
1654 |
|
|
if (def_mount_opts & EXT4_DEFM_DEBUG)
|
1655 |
|
|
set_opt(sbi->s_mount_opt, DEBUG);
|
1656 |
|
|
if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
|
1657 |
|
|
set_opt(sbi->s_mount_opt, GRPID);
|
1658 |
|
|
if (def_mount_opts & EXT4_DEFM_UID16)
|
1659 |
|
|
set_opt(sbi->s_mount_opt, NO_UID32);
|
1660 |
|
|
#ifdef CONFIG_EXT4DEV_FS_XATTR
|
1661 |
|
|
if (def_mount_opts & EXT4_DEFM_XATTR_USER)
|
1662 |
|
|
set_opt(sbi->s_mount_opt, XATTR_USER);
|
1663 |
|
|
#endif
|
1664 |
|
|
#ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
|
1665 |
|
|
if (def_mount_opts & EXT4_DEFM_ACL)
|
1666 |
|
|
set_opt(sbi->s_mount_opt, POSIX_ACL);
|
1667 |
|
|
#endif
|
1668 |
|
|
if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
|
1669 |
|
|
sbi->s_mount_opt |= EXT4_MOUNT_JOURNAL_DATA;
|
1670 |
|
|
else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
|
1671 |
|
|
sbi->s_mount_opt |= EXT4_MOUNT_ORDERED_DATA;
|
1672 |
|
|
else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
|
1673 |
|
|
sbi->s_mount_opt |= EXT4_MOUNT_WRITEBACK_DATA;
|
1674 |
|
|
|
1675 |
|
|
if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
|
1676 |
|
|
set_opt(sbi->s_mount_opt, ERRORS_PANIC);
|
1677 |
|
|
else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_RO)
|
1678 |
|
|
set_opt(sbi->s_mount_opt, ERRORS_RO);
|
1679 |
|
|
else
|
1680 |
|
|
set_opt(sbi->s_mount_opt, ERRORS_CONT);
|
1681 |
|
|
|
1682 |
|
|
sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
|
1683 |
|
|
sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
|
1684 |
|
|
|
1685 |
|
|
set_opt(sbi->s_mount_opt, RESERVATION);
|
1686 |
|
|
|
1687 |
|
|
/*
|
1688 |
|
|
* turn on extents feature by default in ext4 filesystem
|
1689 |
|
|
* User -o noextents to turn it off
|
1690 |
|
|
*/
|
1691 |
|
|
set_opt(sbi->s_mount_opt, EXTENTS);
|
1692 |
|
|
|
1693 |
|
|
if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
|
1694 |
|
|
NULL, 0))
|
1695 |
|
|
goto failed_mount;
|
1696 |
|
|
|
1697 |
|
|
sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
|
1698 |
|
|
((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
|
1699 |
|
|
|
1700 |
|
|
if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
|
1701 |
|
|
(EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
|
1702 |
|
|
EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
|
1703 |
|
|
EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
|
1704 |
|
|
printk(KERN_WARNING
|
1705 |
|
|
"EXT4-fs warning: feature flags set on rev 0 fs, "
|
1706 |
|
|
"running e2fsck is recommended\n");
|
1707 |
|
|
/*
|
1708 |
|
|
* Check feature flags regardless of the revision level, since we
|
1709 |
|
|
* previously didn't change the revision level when setting the flags,
|
1710 |
|
|
* so there is a chance incompat flags are set on a rev 0 filesystem.
|
1711 |
|
|
*/
|
1712 |
|
|
features = EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP);
|
1713 |
|
|
if (features) {
|
1714 |
|
|
printk(KERN_ERR "EXT4-fs: %s: couldn't mount because of "
|
1715 |
|
|
"unsupported optional features (%x).\n",
|
1716 |
|
|
sb->s_id, le32_to_cpu(features));
|
1717 |
|
|
goto failed_mount;
|
1718 |
|
|
}
|
1719 |
|
|
features = EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP);
|
1720 |
|
|
if (!(sb->s_flags & MS_RDONLY) && features) {
|
1721 |
|
|
printk(KERN_ERR "EXT4-fs: %s: couldn't mount RDWR because of "
|
1722 |
|
|
"unsupported optional features (%x).\n",
|
1723 |
|
|
sb->s_id, le32_to_cpu(features));
|
1724 |
|
|
goto failed_mount;
|
1725 |
|
|
}
|
1726 |
|
|
blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
|
1727 |
|
|
|
1728 |
|
|
if (blocksize < EXT4_MIN_BLOCK_SIZE ||
|
1729 |
|
|
blocksize > EXT4_MAX_BLOCK_SIZE) {
|
1730 |
|
|
printk(KERN_ERR
|
1731 |
|
|
"EXT4-fs: Unsupported filesystem blocksize %d on %s.\n",
|
1732 |
|
|
blocksize, sb->s_id);
|
1733 |
|
|
goto failed_mount;
|
1734 |
|
|
}
|
1735 |
|
|
|
1736 |
|
|
hblock = bdev_hardsect_size(sb->s_bdev);
|
1737 |
|
|
if (sb->s_blocksize != blocksize) {
|
1738 |
|
|
/*
|
1739 |
|
|
* Make sure the blocksize for the filesystem is larger
|
1740 |
|
|
* than the hardware sectorsize for the machine.
|
1741 |
|
|
*/
|
1742 |
|
|
if (blocksize < hblock) {
|
1743 |
|
|
printk(KERN_ERR "EXT4-fs: blocksize %d too small for "
|
1744 |
|
|
"device blocksize %d.\n", blocksize, hblock);
|
1745 |
|
|
goto failed_mount;
|
1746 |
|
|
}
|
1747 |
|
|
|
1748 |
|
|
brelse (bh);
|
1749 |
|
|
sb_set_blocksize(sb, blocksize);
|
1750 |
|
|
logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
|
1751 |
|
|
offset = do_div(logical_sb_block, blocksize);
|
1752 |
|
|
bh = sb_bread(sb, logical_sb_block);
|
1753 |
|
|
if (!bh) {
|
1754 |
|
|
printk(KERN_ERR
|
1755 |
|
|
"EXT4-fs: Can't read superblock on 2nd try.\n");
|
1756 |
|
|
goto failed_mount;
|
1757 |
|
|
}
|
1758 |
|
|
es = (struct ext4_super_block *)(((char *)bh->b_data) + offset);
|
1759 |
|
|
sbi->s_es = es;
|
1760 |
|
|
if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
|
1761 |
|
|
printk (KERN_ERR
|
1762 |
|
|
"EXT4-fs: Magic mismatch, very weird !\n");
|
1763 |
|
|
goto failed_mount;
|
1764 |
|
|
}
|
1765 |
|
|
}
|
1766 |
|
|
|
1767 |
|
|
sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits);
|
1768 |
|
|
|
1769 |
|
|
if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
|
1770 |
|
|
sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
|
1771 |
|
|
sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
|
1772 |
|
|
} else {
|
1773 |
|
|
sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
|
1774 |
|
|
sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
|
1775 |
|
|
if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
|
1776 |
|
|
(!is_power_of_2(sbi->s_inode_size)) ||
|
1777 |
|
|
(sbi->s_inode_size > blocksize)) {
|
1778 |
|
|
printk (KERN_ERR
|
1779 |
|
|
"EXT4-fs: unsupported inode size: %d\n",
|
1780 |
|
|
sbi->s_inode_size);
|
1781 |
|
|
goto failed_mount;
|
1782 |
|
|
}
|
1783 |
|
|
if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
|
1784 |
|
|
sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
|
1785 |
|
|
}
|
1786 |
|
|
sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
|
1787 |
|
|
if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
|
1788 |
|
|
if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
|
1789 |
|
|
sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
|
1790 |
|
|
!is_power_of_2(sbi->s_desc_size)) {
|
1791 |
|
|
printk(KERN_ERR
|
1792 |
|
|
"EXT4-fs: unsupported descriptor size %lu\n",
|
1793 |
|
|
sbi->s_desc_size);
|
1794 |
|
|
goto failed_mount;
|
1795 |
|
|
}
|
1796 |
|
|
} else
|
1797 |
|
|
sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
|
1798 |
|
|
sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
|
1799 |
|
|
sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
|
1800 |
|
|
if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
|
1801 |
|
|
goto cantfind_ext4;
|
1802 |
|
|
sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
|
1803 |
|
|
if (sbi->s_inodes_per_block == 0)
|
1804 |
|
|
goto cantfind_ext4;
|
1805 |
|
|
sbi->s_itb_per_group = sbi->s_inodes_per_group /
|
1806 |
|
|
sbi->s_inodes_per_block;
|
1807 |
|
|
sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
|
1808 |
|
|
sbi->s_sbh = bh;
|
1809 |
|
|
sbi->s_mount_state = le16_to_cpu(es->s_state);
|
1810 |
|
|
sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
|
1811 |
|
|
sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
|
1812 |
|
|
for (i=0; i < 4; i++)
|
1813 |
|
|
sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
|
1814 |
|
|
sbi->s_def_hash_version = es->s_def_hash_version;
|
1815 |
|
|
|
1816 |
|
|
if (sbi->s_blocks_per_group > blocksize * 8) {
|
1817 |
|
|
printk (KERN_ERR
|
1818 |
|
|
"EXT4-fs: #blocks per group too big: %lu\n",
|
1819 |
|
|
sbi->s_blocks_per_group);
|
1820 |
|
|
goto failed_mount;
|
1821 |
|
|
}
|
1822 |
|
|
if (sbi->s_inodes_per_group > blocksize * 8) {
|
1823 |
|
|
printk (KERN_ERR
|
1824 |
|
|
"EXT4-fs: #inodes per group too big: %lu\n",
|
1825 |
|
|
sbi->s_inodes_per_group);
|
1826 |
|
|
goto failed_mount;
|
1827 |
|
|
}
|
1828 |
|
|
|
1829 |
|
|
if (ext4_blocks_count(es) >
|
1830 |
|
|
(sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) {
|
1831 |
|
|
printk(KERN_ERR "EXT4-fs: filesystem on %s:"
|
1832 |
|
|
" too large to mount safely\n", sb->s_id);
|
1833 |
|
|
if (sizeof(sector_t) < 8)
|
1834 |
|
|
printk(KERN_WARNING "EXT4-fs: CONFIG_LBD not "
|
1835 |
|
|
"enabled\n");
|
1836 |
|
|
goto failed_mount;
|
1837 |
|
|
}
|
1838 |
|
|
|
1839 |
|
|
if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
|
1840 |
|
|
goto cantfind_ext4;
|
1841 |
|
|
blocks_count = (ext4_blocks_count(es) -
|
1842 |
|
|
le32_to_cpu(es->s_first_data_block) +
|
1843 |
|
|
EXT4_BLOCKS_PER_GROUP(sb) - 1);
|
1844 |
|
|
do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
|
1845 |
|
|
sbi->s_groups_count = blocks_count;
|
1846 |
|
|
db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
|
1847 |
|
|
EXT4_DESC_PER_BLOCK(sb);
|
1848 |
|
|
sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
|
1849 |
|
|
GFP_KERNEL);
|
1850 |
|
|
if (sbi->s_group_desc == NULL) {
|
1851 |
|
|
printk (KERN_ERR "EXT4-fs: not enough memory\n");
|
1852 |
|
|
goto failed_mount;
|
1853 |
|
|
}
|
1854 |
|
|
|
1855 |
|
|
bgl_lock_init(&sbi->s_blockgroup_lock);
|
1856 |
|
|
|
1857 |
|
|
for (i = 0; i < db_count; i++) {
|
1858 |
|
|
block = descriptor_loc(sb, logical_sb_block, i);
|
1859 |
|
|
sbi->s_group_desc[i] = sb_bread(sb, block);
|
1860 |
|
|
if (!sbi->s_group_desc[i]) {
|
1861 |
|
|
printk (KERN_ERR "EXT4-fs: "
|
1862 |
|
|
"can't read group descriptor %d\n", i);
|
1863 |
|
|
db_count = i;
|
1864 |
|
|
goto failed_mount2;
|
1865 |
|
|
}
|
1866 |
|
|
}
|
1867 |
|
|
if (!ext4_check_descriptors (sb)) {
|
1868 |
|
|
printk(KERN_ERR "EXT4-fs: group descriptors corrupted!\n");
|
1869 |
|
|
goto failed_mount2;
|
1870 |
|
|
}
|
1871 |
|
|
sbi->s_gdb_count = db_count;
|
1872 |
|
|
get_random_bytes(&sbi->s_next_generation, sizeof(u32));
|
1873 |
|
|
spin_lock_init(&sbi->s_next_gen_lock);
|
1874 |
|
|
|
1875 |
|
|
err = percpu_counter_init(&sbi->s_freeblocks_counter,
|
1876 |
|
|
ext4_count_free_blocks(sb));
|
1877 |
|
|
if (!err) {
|
1878 |
|
|
err = percpu_counter_init(&sbi->s_freeinodes_counter,
|
1879 |
|
|
ext4_count_free_inodes(sb));
|
1880 |
|
|
}
|
1881 |
|
|
if (!err) {
|
1882 |
|
|
err = percpu_counter_init(&sbi->s_dirs_counter,
|
1883 |
|
|
ext4_count_dirs(sb));
|
1884 |
|
|
}
|
1885 |
|
|
if (err) {
|
1886 |
|
|
printk(KERN_ERR "EXT4-fs: insufficient memory\n");
|
1887 |
|
|
goto failed_mount3;
|
1888 |
|
|
}
|
1889 |
|
|
|
1890 |
|
|
/* per fileystem reservation list head & lock */
|
1891 |
|
|
spin_lock_init(&sbi->s_rsv_window_lock);
|
1892 |
|
|
sbi->s_rsv_window_root = RB_ROOT;
|
1893 |
|
|
/* Add a single, static dummy reservation to the start of the
|
1894 |
|
|
* reservation window list --- it gives us a placeholder for
|
1895 |
|
|
* append-at-start-of-list which makes the allocation logic
|
1896 |
|
|
* _much_ simpler. */
|
1897 |
|
|
sbi->s_rsv_window_head.rsv_start = EXT4_RESERVE_WINDOW_NOT_ALLOCATED;
|
1898 |
|
|
sbi->s_rsv_window_head.rsv_end = EXT4_RESERVE_WINDOW_NOT_ALLOCATED;
|
1899 |
|
|
sbi->s_rsv_window_head.rsv_alloc_hit = 0;
|
1900 |
|
|
sbi->s_rsv_window_head.rsv_goal_size = 0;
|
1901 |
|
|
ext4_rsv_window_add(sb, &sbi->s_rsv_window_head);
|
1902 |
|
|
|
1903 |
|
|
/*
|
1904 |
|
|
* set up enough so that it can read an inode
|
1905 |
|
|
*/
|
1906 |
|
|
sb->s_op = &ext4_sops;
|
1907 |
|
|
sb->s_export_op = &ext4_export_ops;
|
1908 |
|
|
sb->s_xattr = ext4_xattr_handlers;
|
1909 |
|
|
#ifdef CONFIG_QUOTA
|
1910 |
|
|
sb->s_qcop = &ext4_qctl_operations;
|
1911 |
|
|
sb->dq_op = &ext4_quota_operations;
|
1912 |
|
|
#endif
|
1913 |
|
|
INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
|
1914 |
|
|
|
1915 |
|
|
sb->s_root = NULL;
|
1916 |
|
|
|
1917 |
|
|
needs_recovery = (es->s_last_orphan != 0 ||
|
1918 |
|
|
EXT4_HAS_INCOMPAT_FEATURE(sb,
|
1919 |
|
|
EXT4_FEATURE_INCOMPAT_RECOVER));
|
1920 |
|
|
|
1921 |
|
|
/*
|
1922 |
|
|
* The first inode we look at is the journal inode. Don't try
|
1923 |
|
|
* root first: it may be modified in the journal!
|
1924 |
|
|
*/
|
1925 |
|
|
if (!test_opt(sb, NOLOAD) &&
|
1926 |
|
|
EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
|
1927 |
|
|
if (ext4_load_journal(sb, es, journal_devnum))
|
1928 |
|
|
goto failed_mount3;
|
1929 |
|
|
} else if (journal_inum) {
|
1930 |
|
|
if (ext4_create_journal(sb, es, journal_inum))
|
1931 |
|
|
goto failed_mount3;
|
1932 |
|
|
} else {
|
1933 |
|
|
if (!silent)
|
1934 |
|
|
printk (KERN_ERR
|
1935 |
|
|
"ext4: No journal on filesystem on %s\n",
|
1936 |
|
|
sb->s_id);
|
1937 |
|
|
goto failed_mount3;
|
1938 |
|
|
}
|
1939 |
|
|
|
1940 |
|
|
if (ext4_blocks_count(es) > 0xffffffffULL &&
|
1941 |
|
|
!jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
|
1942 |
|
|
JBD2_FEATURE_INCOMPAT_64BIT)) {
|
1943 |
|
|
printk(KERN_ERR "ext4: Failed to set 64-bit journal feature\n");
|
1944 |
|
|
goto failed_mount4;
|
1945 |
|
|
}
|
1946 |
|
|
|
1947 |
|
|
/* We have now updated the journal if required, so we can
|
1948 |
|
|
* validate the data journaling mode. */
|
1949 |
|
|
switch (test_opt(sb, DATA_FLAGS)) {
|
1950 |
|
|
case 0:
|
1951 |
|
|
/* No mode set, assume a default based on the journal
|
1952 |
|
|
* capabilities: ORDERED_DATA if the journal can
|
1953 |
|
|
* cope, else JOURNAL_DATA
|
1954 |
|
|
*/
|
1955 |
|
|
if (jbd2_journal_check_available_features
|
1956 |
|
|
(sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
|
1957 |
|
|
set_opt(sbi->s_mount_opt, ORDERED_DATA);
|
1958 |
|
|
else
|
1959 |
|
|
set_opt(sbi->s_mount_opt, JOURNAL_DATA);
|
1960 |
|
|
break;
|
1961 |
|
|
|
1962 |
|
|
case EXT4_MOUNT_ORDERED_DATA:
|
1963 |
|
|
case EXT4_MOUNT_WRITEBACK_DATA:
|
1964 |
|
|
if (!jbd2_journal_check_available_features
|
1965 |
|
|
(sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
|
1966 |
|
|
printk(KERN_ERR "EXT4-fs: Journal does not support "
|
1967 |
|
|
"requested data journaling mode\n");
|
1968 |
|
|
goto failed_mount4;
|
1969 |
|
|
}
|
1970 |
|
|
default:
|
1971 |
|
|
break;
|
1972 |
|
|
}
|
1973 |
|
|
|
1974 |
|
|
if (test_opt(sb, NOBH)) {
|
1975 |
|
|
if (!(test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)) {
|
1976 |
|
|
printk(KERN_WARNING "EXT4-fs: Ignoring nobh option - "
|
1977 |
|
|
"its supported only with writeback mode\n");
|
1978 |
|
|
clear_opt(sbi->s_mount_opt, NOBH);
|
1979 |
|
|
}
|
1980 |
|
|
}
|
1981 |
|
|
/*
|
1982 |
|
|
* The jbd2_journal_load will have done any necessary log recovery,
|
1983 |
|
|
* so we can safely mount the rest of the filesystem now.
|
1984 |
|
|
*/
|
1985 |
|
|
|
1986 |
|
|
root = iget(sb, EXT4_ROOT_INO);
|
1987 |
|
|
sb->s_root = d_alloc_root(root);
|
1988 |
|
|
if (!sb->s_root) {
|
1989 |
|
|
printk(KERN_ERR "EXT4-fs: get root inode failed\n");
|
1990 |
|
|
iput(root);
|
1991 |
|
|
goto failed_mount4;
|
1992 |
|
|
}
|
1993 |
|
|
if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
|
1994 |
|
|
dput(sb->s_root);
|
1995 |
|
|
sb->s_root = NULL;
|
1996 |
|
|
printk(KERN_ERR "EXT4-fs: corrupt root inode, run e2fsck\n");
|
1997 |
|
|
goto failed_mount4;
|
1998 |
|
|
}
|
1999 |
|
|
|
2000 |
|
|
ext4_setup_super (sb, es, sb->s_flags & MS_RDONLY);
|
2001 |
|
|
|
2002 |
|
|
/* determine the minimum size of new large inodes, if present */
|
2003 |
|
|
if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
|
2004 |
|
|
sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
|
2005 |
|
|
EXT4_GOOD_OLD_INODE_SIZE;
|
2006 |
|
|
if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
|
2007 |
|
|
EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
|
2008 |
|
|
if (sbi->s_want_extra_isize <
|
2009 |
|
|
le16_to_cpu(es->s_want_extra_isize))
|
2010 |
|
|
sbi->s_want_extra_isize =
|
2011 |
|
|
le16_to_cpu(es->s_want_extra_isize);
|
2012 |
|
|
if (sbi->s_want_extra_isize <
|
2013 |
|
|
le16_to_cpu(es->s_min_extra_isize))
|
2014 |
|
|
sbi->s_want_extra_isize =
|
2015 |
|
|
le16_to_cpu(es->s_min_extra_isize);
|
2016 |
|
|
}
|
2017 |
|
|
}
|
2018 |
|
|
/* Check if enough inode space is available */
|
2019 |
|
|
if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
|
2020 |
|
|
sbi->s_inode_size) {
|
2021 |
|
|
sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
|
2022 |
|
|
EXT4_GOOD_OLD_INODE_SIZE;
|
2023 |
|
|
printk(KERN_INFO "EXT4-fs: required extra inode space not"
|
2024 |
|
|
"available.\n");
|
2025 |
|
|
}
|
2026 |
|
|
|
2027 |
|
|
/*
|
2028 |
|
|
* akpm: core read_super() calls in here with the superblock locked.
|
2029 |
|
|
* That deadlocks, because orphan cleanup needs to lock the superblock
|
2030 |
|
|
* in numerous places. Here we just pop the lock - it's relatively
|
2031 |
|
|
* harmless, because we are now ready to accept write_super() requests,
|
2032 |
|
|
* and aviro says that's the only reason for hanging onto the
|
2033 |
|
|
* superblock lock.
|
2034 |
|
|
*/
|
2035 |
|
|
EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
|
2036 |
|
|
ext4_orphan_cleanup(sb, es);
|
2037 |
|
|
EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
|
2038 |
|
|
if (needs_recovery)
|
2039 |
|
|
printk (KERN_INFO "EXT4-fs: recovery complete.\n");
|
2040 |
|
|
ext4_mark_recovery_complete(sb, es);
|
2041 |
|
|
printk (KERN_INFO "EXT4-fs: mounted filesystem with %s data mode.\n",
|
2042 |
|
|
test_opt(sb,DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA ? "journal":
|
2043 |
|
|
test_opt(sb,DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA ? "ordered":
|
2044 |
|
|
"writeback");
|
2045 |
|
|
|
2046 |
|
|
ext4_ext_init(sb);
|
2047 |
|
|
|
2048 |
|
|
lock_kernel();
|
2049 |
|
|
return 0;
|
2050 |
|
|
|
2051 |
|
|
cantfind_ext4:
|
2052 |
|
|
if (!silent)
|
2053 |
|
|
printk(KERN_ERR "VFS: Can't find ext4 filesystem on dev %s.\n",
|
2054 |
|
|
sb->s_id);
|
2055 |
|
|
goto failed_mount;
|
2056 |
|
|
|
2057 |
|
|
failed_mount4:
|
2058 |
|
|
jbd2_journal_destroy(sbi->s_journal);
|
2059 |
|
|
failed_mount3:
|
2060 |
|
|
percpu_counter_destroy(&sbi->s_freeblocks_counter);
|
2061 |
|
|
percpu_counter_destroy(&sbi->s_freeinodes_counter);
|
2062 |
|
|
percpu_counter_destroy(&sbi->s_dirs_counter);
|
2063 |
|
|
failed_mount2:
|
2064 |
|
|
for (i = 0; i < db_count; i++)
|
2065 |
|
|
brelse(sbi->s_group_desc[i]);
|
2066 |
|
|
kfree(sbi->s_group_desc);
|
2067 |
|
|
failed_mount:
|
2068 |
|
|
#ifdef CONFIG_QUOTA
|
2069 |
|
|
for (i = 0; i < MAXQUOTAS; i++)
|
2070 |
|
|
kfree(sbi->s_qf_names[i]);
|
2071 |
|
|
#endif
|
2072 |
|
|
ext4_blkdev_remove(sbi);
|
2073 |
|
|
brelse(bh);
|
2074 |
|
|
out_fail:
|
2075 |
|
|
sb->s_fs_info = NULL;
|
2076 |
|
|
kfree(sbi);
|
2077 |
|
|
lock_kernel();
|
2078 |
|
|
return -EINVAL;
|
2079 |
|
|
}
|
2080 |
|
|
|
2081 |
|
|
/*
|
2082 |
|
|
* Setup any per-fs journal parameters now. We'll do this both on
|
2083 |
|
|
* initial mount, once the journal has been initialised but before we've
|
2084 |
|
|
* done any recovery; and again on any subsequent remount.
|
2085 |
|
|
*/
|
2086 |
|
|
static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
|
2087 |
|
|
{
|
2088 |
|
|
struct ext4_sb_info *sbi = EXT4_SB(sb);
|
2089 |
|
|
|
2090 |
|
|
if (sbi->s_commit_interval)
|
2091 |
|
|
journal->j_commit_interval = sbi->s_commit_interval;
|
2092 |
|
|
/* We could also set up an ext4-specific default for the commit
|
2093 |
|
|
* interval here, but for now we'll just fall back to the jbd
|
2094 |
|
|
* default. */
|
2095 |
|
|
|
2096 |
|
|
spin_lock(&journal->j_state_lock);
|
2097 |
|
|
if (test_opt(sb, BARRIER))
|
2098 |
|
|
journal->j_flags |= JBD2_BARRIER;
|
2099 |
|
|
else
|
2100 |
|
|
journal->j_flags &= ~JBD2_BARRIER;
|
2101 |
|
|
spin_unlock(&journal->j_state_lock);
|
2102 |
|
|
}
|
2103 |
|
|
|
2104 |
|
|
static journal_t *ext4_get_journal(struct super_block *sb,
|
2105 |
|
|
unsigned int journal_inum)
|
2106 |
|
|
{
|
2107 |
|
|
struct inode *journal_inode;
|
2108 |
|
|
journal_t *journal;
|
2109 |
|
|
|
2110 |
|
|
/* First, test for the existence of a valid inode on disk. Bad
|
2111 |
|
|
* things happen if we iget() an unused inode, as the subsequent
|
2112 |
|
|
* iput() will try to delete it. */
|
2113 |
|
|
|
2114 |
|
|
journal_inode = iget(sb, journal_inum);
|
2115 |
|
|
if (!journal_inode) {
|
2116 |
|
|
printk(KERN_ERR "EXT4-fs: no journal found.\n");
|
2117 |
|
|
return NULL;
|
2118 |
|
|
}
|
2119 |
|
|
if (!journal_inode->i_nlink) {
|
2120 |
|
|
make_bad_inode(journal_inode);
|
2121 |
|
|
iput(journal_inode);
|
2122 |
|
|
printk(KERN_ERR "EXT4-fs: journal inode is deleted.\n");
|
2123 |
|
|
return NULL;
|
2124 |
|
|
}
|
2125 |
|
|
|
2126 |
|
|
jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
|
2127 |
|
|
journal_inode, journal_inode->i_size);
|
2128 |
|
|
if (is_bad_inode(journal_inode) || !S_ISREG(journal_inode->i_mode)) {
|
2129 |
|
|
printk(KERN_ERR "EXT4-fs: invalid journal inode.\n");
|
2130 |
|
|
iput(journal_inode);
|
2131 |
|
|
return NULL;
|
2132 |
|
|
}
|
2133 |
|
|
|
2134 |
|
|
journal = jbd2_journal_init_inode(journal_inode);
|
2135 |
|
|
if (!journal) {
|
2136 |
|
|
printk(KERN_ERR "EXT4-fs: Could not load journal inode\n");
|
2137 |
|
|
iput(journal_inode);
|
2138 |
|
|
return NULL;
|
2139 |
|
|
}
|
2140 |
|
|
journal->j_private = sb;
|
2141 |
|
|
ext4_init_journal_params(sb, journal);
|
2142 |
|
|
return journal;
|
2143 |
|
|
}
|
2144 |
|
|
|
2145 |
|
|
static journal_t *ext4_get_dev_journal(struct super_block *sb,
|
2146 |
|
|
dev_t j_dev)
|
2147 |
|
|
{
|
2148 |
|
|
struct buffer_head * bh;
|
2149 |
|
|
journal_t *journal;
|
2150 |
|
|
ext4_fsblk_t start;
|
2151 |
|
|
ext4_fsblk_t len;
|
2152 |
|
|
int hblock, blocksize;
|
2153 |
|
|
ext4_fsblk_t sb_block;
|
2154 |
|
|
unsigned long offset;
|
2155 |
|
|
struct ext4_super_block * es;
|
2156 |
|
|
struct block_device *bdev;
|
2157 |
|
|
|
2158 |
|
|
bdev = ext4_blkdev_get(j_dev);
|
2159 |
|
|
if (bdev == NULL)
|
2160 |
|
|
return NULL;
|
2161 |
|
|
|
2162 |
|
|
if (bd_claim(bdev, sb)) {
|
2163 |
|
|
printk(KERN_ERR
|
2164 |
|
|
"EXT4: failed to claim external journal device.\n");
|
2165 |
|
|
blkdev_put(bdev);
|
2166 |
|
|
return NULL;
|
2167 |
|
|
}
|
2168 |
|
|
|
2169 |
|
|
blocksize = sb->s_blocksize;
|
2170 |
|
|
hblock = bdev_hardsect_size(bdev);
|
2171 |
|
|
if (blocksize < hblock) {
|
2172 |
|
|
printk(KERN_ERR
|
2173 |
|
|
"EXT4-fs: blocksize too small for journal device.\n");
|
2174 |
|
|
goto out_bdev;
|
2175 |
|
|
}
|
2176 |
|
|
|
2177 |
|
|
sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
|
2178 |
|
|
offset = EXT4_MIN_BLOCK_SIZE % blocksize;
|
2179 |
|
|
set_blocksize(bdev, blocksize);
|
2180 |
|
|
if (!(bh = __bread(bdev, sb_block, blocksize))) {
|
2181 |
|
|
printk(KERN_ERR "EXT4-fs: couldn't read superblock of "
|
2182 |
|
|
"external journal\n");
|
2183 |
|
|
goto out_bdev;
|
2184 |
|
|
}
|
2185 |
|
|
|
2186 |
|
|
es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
|
2187 |
|
|
if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
|
2188 |
|
|
!(le32_to_cpu(es->s_feature_incompat) &
|
2189 |
|
|
EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
|
2190 |
|
|
printk(KERN_ERR "EXT4-fs: external journal has "
|
2191 |
|
|
"bad superblock\n");
|
2192 |
|
|
brelse(bh);
|
2193 |
|
|
goto out_bdev;
|
2194 |
|
|
}
|
2195 |
|
|
|
2196 |
|
|
if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
|
2197 |
|
|
printk(KERN_ERR "EXT4-fs: journal UUID does not match\n");
|
2198 |
|
|
brelse(bh);
|
2199 |
|
|
goto out_bdev;
|
2200 |
|
|
}
|
2201 |
|
|
|
2202 |
|
|
len = ext4_blocks_count(es);
|
2203 |
|
|
start = sb_block + 1;
|
2204 |
|
|
brelse(bh); /* we're done with the superblock */
|
2205 |
|
|
|
2206 |
|
|
journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
|
2207 |
|
|
start, len, blocksize);
|
2208 |
|
|
if (!journal) {
|
2209 |
|
|
printk(KERN_ERR "EXT4-fs: failed to create device journal\n");
|
2210 |
|
|
goto out_bdev;
|
2211 |
|
|
}
|
2212 |
|
|
journal->j_private = sb;
|
2213 |
|
|
ll_rw_block(READ, 1, &journal->j_sb_buffer);
|
2214 |
|
|
wait_on_buffer(journal->j_sb_buffer);
|
2215 |
|
|
if (!buffer_uptodate(journal->j_sb_buffer)) {
|
2216 |
|
|
printk(KERN_ERR "EXT4-fs: I/O error on journal device\n");
|
2217 |
|
|
goto out_journal;
|
2218 |
|
|
}
|
2219 |
|
|
if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
|
2220 |
|
|
printk(KERN_ERR "EXT4-fs: External journal has more than one "
|
2221 |
|
|
"user (unsupported) - %d\n",
|
2222 |
|
|
be32_to_cpu(journal->j_superblock->s_nr_users));
|
2223 |
|
|
goto out_journal;
|
2224 |
|
|
}
|
2225 |
|
|
EXT4_SB(sb)->journal_bdev = bdev;
|
2226 |
|
|
ext4_init_journal_params(sb, journal);
|
2227 |
|
|
return journal;
|
2228 |
|
|
out_journal:
|
2229 |
|
|
jbd2_journal_destroy(journal);
|
2230 |
|
|
out_bdev:
|
2231 |
|
|
ext4_blkdev_put(bdev);
|
2232 |
|
|
return NULL;
|
2233 |
|
|
}
|
2234 |
|
|
|
2235 |
|
|
static int ext4_load_journal(struct super_block *sb,
|
2236 |
|
|
struct ext4_super_block *es,
|
2237 |
|
|
unsigned long journal_devnum)
|
2238 |
|
|
{
|
2239 |
|
|
journal_t *journal;
|
2240 |
|
|
unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
|
2241 |
|
|
dev_t journal_dev;
|
2242 |
|
|
int err = 0;
|
2243 |
|
|
int really_read_only;
|
2244 |
|
|
|
2245 |
|
|
if (journal_devnum &&
|
2246 |
|
|
journal_devnum != le32_to_cpu(es->s_journal_dev)) {
|
2247 |
|
|
printk(KERN_INFO "EXT4-fs: external journal device major/minor "
|
2248 |
|
|
"numbers have changed\n");
|
2249 |
|
|
journal_dev = new_decode_dev(journal_devnum);
|
2250 |
|
|
} else
|
2251 |
|
|
journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
|
2252 |
|
|
|
2253 |
|
|
really_read_only = bdev_read_only(sb->s_bdev);
|
2254 |
|
|
|
2255 |
|
|
/*
|
2256 |
|
|
* Are we loading a blank journal or performing recovery after a
|
2257 |
|
|
* crash? For recovery, we need to check in advance whether we
|
2258 |
|
|
* can get read-write access to the device.
|
2259 |
|
|
*/
|
2260 |
|
|
|
2261 |
|
|
if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
|
2262 |
|
|
if (sb->s_flags & MS_RDONLY) {
|
2263 |
|
|
printk(KERN_INFO "EXT4-fs: INFO: recovery "
|
2264 |
|
|
"required on readonly filesystem.\n");
|
2265 |
|
|
if (really_read_only) {
|
2266 |
|
|
printk(KERN_ERR "EXT4-fs: write access "
|
2267 |
|
|
"unavailable, cannot proceed.\n");
|
2268 |
|
|
return -EROFS;
|
2269 |
|
|
}
|
2270 |
|
|
printk (KERN_INFO "EXT4-fs: write access will "
|
2271 |
|
|
"be enabled during recovery.\n");
|
2272 |
|
|
}
|
2273 |
|
|
}
|
2274 |
|
|
|
2275 |
|
|
if (journal_inum && journal_dev) {
|
2276 |
|
|
printk(KERN_ERR "EXT4-fs: filesystem has both journal "
|
2277 |
|
|
"and inode journals!\n");
|
2278 |
|
|
return -EINVAL;
|
2279 |
|
|
}
|
2280 |
|
|
|
2281 |
|
|
if (journal_inum) {
|
2282 |
|
|
if (!(journal = ext4_get_journal(sb, journal_inum)))
|
2283 |
|
|
return -EINVAL;
|
2284 |
|
|
} else {
|
2285 |
|
|
if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
|
2286 |
|
|
return -EINVAL;
|
2287 |
|
|
}
|
2288 |
|
|
|
2289 |
|
|
if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
|
2290 |
|
|
err = jbd2_journal_update_format(journal);
|
2291 |
|
|
if (err) {
|
2292 |
|
|
printk(KERN_ERR "EXT4-fs: error updating journal.\n");
|
2293 |
|
|
jbd2_journal_destroy(journal);
|
2294 |
|
|
return err;
|
2295 |
|
|
}
|
2296 |
|
|
}
|
2297 |
|
|
|
2298 |
|
|
if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
|
2299 |
|
|
err = jbd2_journal_wipe(journal, !really_read_only);
|
2300 |
|
|
if (!err)
|
2301 |
|
|
err = jbd2_journal_load(journal);
|
2302 |
|
|
|
2303 |
|
|
if (err) {
|
2304 |
|
|
printk(KERN_ERR "EXT4-fs: error loading journal.\n");
|
2305 |
|
|
jbd2_journal_destroy(journal);
|
2306 |
|
|
return err;
|
2307 |
|
|
}
|
2308 |
|
|
|
2309 |
|
|
EXT4_SB(sb)->s_journal = journal;
|
2310 |
|
|
ext4_clear_journal_err(sb, es);
|
2311 |
|
|
|
2312 |
|
|
if (journal_devnum &&
|
2313 |
|
|
journal_devnum != le32_to_cpu(es->s_journal_dev)) {
|
2314 |
|
|
es->s_journal_dev = cpu_to_le32(journal_devnum);
|
2315 |
|
|
sb->s_dirt = 1;
|
2316 |
|
|
|
2317 |
|
|
/* Make sure we flush the recovery flag to disk. */
|
2318 |
|
|
ext4_commit_super(sb, es, 1);
|
2319 |
|
|
}
|
2320 |
|
|
|
2321 |
|
|
return 0;
|
2322 |
|
|
}
|
2323 |
|
|
|
2324 |
|
|
static int ext4_create_journal(struct super_block * sb,
|
2325 |
|
|
struct ext4_super_block * es,
|
2326 |
|
|
unsigned int journal_inum)
|
2327 |
|
|
{
|
2328 |
|
|
journal_t *journal;
|
2329 |
|
|
int err;
|
2330 |
|
|
|
2331 |
|
|
if (sb->s_flags & MS_RDONLY) {
|
2332 |
|
|
printk(KERN_ERR "EXT4-fs: readonly filesystem when trying to "
|
2333 |
|
|
"create journal.\n");
|
2334 |
|
|
return -EROFS;
|
2335 |
|
|
}
|
2336 |
|
|
|
2337 |
|
|
journal = ext4_get_journal(sb, journal_inum);
|
2338 |
|
|
if (!journal)
|
2339 |
|
|
return -EINVAL;
|
2340 |
|
|
|
2341 |
|
|
printk(KERN_INFO "EXT4-fs: creating new journal on inode %u\n",
|
2342 |
|
|
journal_inum);
|
2343 |
|
|
|
2344 |
|
|
err = jbd2_journal_create(journal);
|
2345 |
|
|
if (err) {
|
2346 |
|
|
printk(KERN_ERR "EXT4-fs: error creating journal.\n");
|
2347 |
|
|
jbd2_journal_destroy(journal);
|
2348 |
|
|
return -EIO;
|
2349 |
|
|
}
|
2350 |
|
|
|
2351 |
|
|
EXT4_SB(sb)->s_journal = journal;
|
2352 |
|
|
|
2353 |
|
|
ext4_update_dynamic_rev(sb);
|
2354 |
|
|
EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
|
2355 |
|
|
EXT4_SET_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL);
|
2356 |
|
|
|
2357 |
|
|
es->s_journal_inum = cpu_to_le32(journal_inum);
|
2358 |
|
|
sb->s_dirt = 1;
|
2359 |
|
|
|
2360 |
|
|
/* Make sure we flush the recovery flag to disk. */
|
2361 |
|
|
ext4_commit_super(sb, es, 1);
|
2362 |
|
|
|
2363 |
|
|
return 0;
|
2364 |
|
|
}
|
2365 |
|
|
|
2366 |
|
|
static void ext4_commit_super (struct super_block * sb,
|
2367 |
|
|
struct ext4_super_block * es,
|
2368 |
|
|
int sync)
|
2369 |
|
|
{
|
2370 |
|
|
struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
|
2371 |
|
|
|
2372 |
|
|
if (!sbh)
|
2373 |
|
|
return;
|
2374 |
|
|
es->s_wtime = cpu_to_le32(get_seconds());
|
2375 |
|
|
ext4_free_blocks_count_set(es, ext4_count_free_blocks(sb));
|
2376 |
|
|
es->s_free_inodes_count = cpu_to_le32(ext4_count_free_inodes(sb));
|
2377 |
|
|
BUFFER_TRACE(sbh, "marking dirty");
|
2378 |
|
|
mark_buffer_dirty(sbh);
|
2379 |
|
|
if (sync)
|
2380 |
|
|
sync_dirty_buffer(sbh);
|
2381 |
|
|
}
|
2382 |
|
|
|
2383 |
|
|
|
2384 |
|
|
/*
|
2385 |
|
|
* Have we just finished recovery? If so, and if we are mounting (or
|
2386 |
|
|
* remounting) the filesystem readonly, then we will end up with a
|
2387 |
|
|
* consistent fs on disk. Record that fact.
|
2388 |
|
|
*/
|
2389 |
|
|
static void ext4_mark_recovery_complete(struct super_block * sb,
|
2390 |
|
|
struct ext4_super_block * es)
|
2391 |
|
|
{
|
2392 |
|
|
journal_t *journal = EXT4_SB(sb)->s_journal;
|
2393 |
|
|
|
2394 |
|
|
jbd2_journal_lock_updates(journal);
|
2395 |
|
|
jbd2_journal_flush(journal);
|
2396 |
|
|
lock_super(sb);
|
2397 |
|
|
if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
|
2398 |
|
|
sb->s_flags & MS_RDONLY) {
|
2399 |
|
|
EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
|
2400 |
|
|
sb->s_dirt = 0;
|
2401 |
|
|
ext4_commit_super(sb, es, 1);
|
2402 |
|
|
}
|
2403 |
|
|
unlock_super(sb);
|
2404 |
|
|
jbd2_journal_unlock_updates(journal);
|
2405 |
|
|
}
|
2406 |
|
|
|
2407 |
|
|
/*
|
2408 |
|
|
* If we are mounting (or read-write remounting) a filesystem whose journal
|
2409 |
|
|
* has recorded an error from a previous lifetime, move that error to the
|
2410 |
|
|
* main filesystem now.
|
2411 |
|
|
*/
|
2412 |
|
|
static void ext4_clear_journal_err(struct super_block * sb,
|
2413 |
|
|
struct ext4_super_block * es)
|
2414 |
|
|
{
|
2415 |
|
|
journal_t *journal;
|
2416 |
|
|
int j_errno;
|
2417 |
|
|
const char *errstr;
|
2418 |
|
|
|
2419 |
|
|
journal = EXT4_SB(sb)->s_journal;
|
2420 |
|
|
|
2421 |
|
|
/*
|
2422 |
|
|
* Now check for any error status which may have been recorded in the
|
2423 |
|
|
* journal by a prior ext4_error() or ext4_abort()
|
2424 |
|
|
*/
|
2425 |
|
|
|
2426 |
|
|
j_errno = jbd2_journal_errno(journal);
|
2427 |
|
|
if (j_errno) {
|
2428 |
|
|
char nbuf[16];
|
2429 |
|
|
|
2430 |
|
|
errstr = ext4_decode_error(sb, j_errno, nbuf);
|
2431 |
|
|
ext4_warning(sb, __FUNCTION__, "Filesystem error recorded "
|
2432 |
|
|
"from previous mount: %s", errstr);
|
2433 |
|
|
ext4_warning(sb, __FUNCTION__, "Marking fs in need of "
|
2434 |
|
|
"filesystem check.");
|
2435 |
|
|
|
2436 |
|
|
EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
|
2437 |
|
|
es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
|
2438 |
|
|
ext4_commit_super (sb, es, 1);
|
2439 |
|
|
|
2440 |
|
|
jbd2_journal_clear_err(journal);
|
2441 |
|
|
}
|
2442 |
|
|
}
|
2443 |
|
|
|
2444 |
|
|
/*
|
2445 |
|
|
* Force the running and committing transactions to commit,
|
2446 |
|
|
* and wait on the commit.
|
2447 |
|
|
*/
|
2448 |
|
|
int ext4_force_commit(struct super_block *sb)
|
2449 |
|
|
{
|
2450 |
|
|
journal_t *journal;
|
2451 |
|
|
int ret;
|
2452 |
|
|
|
2453 |
|
|
if (sb->s_flags & MS_RDONLY)
|
2454 |
|
|
return 0;
|
2455 |
|
|
|
2456 |
|
|
journal = EXT4_SB(sb)->s_journal;
|
2457 |
|
|
sb->s_dirt = 0;
|
2458 |
|
|
ret = ext4_journal_force_commit(journal);
|
2459 |
|
|
return ret;
|
2460 |
|
|
}
|
2461 |
|
|
|
2462 |
|
|
/*
|
2463 |
|
|
* Ext4 always journals updates to the superblock itself, so we don't
|
2464 |
|
|
* have to propagate any other updates to the superblock on disk at this
|
2465 |
|
|
* point. Just start an async writeback to get the buffers on their way
|
2466 |
|
|
* to the disk.
|
2467 |
|
|
*
|
2468 |
|
|
* This implicitly triggers the writebehind on sync().
|
2469 |
|
|
*/
|
2470 |
|
|
|
2471 |
|
|
static void ext4_write_super (struct super_block * sb)
|
2472 |
|
|
{
|
2473 |
|
|
if (mutex_trylock(&sb->s_lock) != 0)
|
2474 |
|
|
BUG();
|
2475 |
|
|
sb->s_dirt = 0;
|
2476 |
|
|
}
|
2477 |
|
|
|
2478 |
|
|
static int ext4_sync_fs(struct super_block *sb, int wait)
|
2479 |
|
|
{
|
2480 |
|
|
tid_t target;
|
2481 |
|
|
|
2482 |
|
|
sb->s_dirt = 0;
|
2483 |
|
|
if (jbd2_journal_start_commit(EXT4_SB(sb)->s_journal, &target)) {
|
2484 |
|
|
if (wait)
|
2485 |
|
|
jbd2_log_wait_commit(EXT4_SB(sb)->s_journal, target);
|
2486 |
|
|
}
|
2487 |
|
|
return 0;
|
2488 |
|
|
}
|
2489 |
|
|
|
2490 |
|
|
/*
|
2491 |
|
|
* LVM calls this function before a (read-only) snapshot is created. This
|
2492 |
|
|
* gives us a chance to flush the journal completely and mark the fs clean.
|
2493 |
|
|
*/
|
2494 |
|
|
static void ext4_write_super_lockfs(struct super_block *sb)
|
2495 |
|
|
{
|
2496 |
|
|
sb->s_dirt = 0;
|
2497 |
|
|
|
2498 |
|
|
if (!(sb->s_flags & MS_RDONLY)) {
|
2499 |
|
|
journal_t *journal = EXT4_SB(sb)->s_journal;
|
2500 |
|
|
|
2501 |
|
|
/* Now we set up the journal barrier. */
|
2502 |
|
|
jbd2_journal_lock_updates(journal);
|
2503 |
|
|
jbd2_journal_flush(journal);
|
2504 |
|
|
|
2505 |
|
|
/* Journal blocked and flushed, clear needs_recovery flag. */
|
2506 |
|
|
EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
|
2507 |
|
|
ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1);
|
2508 |
|
|
}
|
2509 |
|
|
}
|
2510 |
|
|
|
2511 |
|
|
/*
|
2512 |
|
|
* Called by LVM after the snapshot is done. We need to reset the RECOVER
|
2513 |
|
|
* flag here, even though the filesystem is not technically dirty yet.
|
2514 |
|
|
*/
|
2515 |
|
|
static void ext4_unlockfs(struct super_block *sb)
|
2516 |
|
|
{
|
2517 |
|
|
if (!(sb->s_flags & MS_RDONLY)) {
|
2518 |
|
|
lock_super(sb);
|
2519 |
|
|
/* Reser the needs_recovery flag before the fs is unlocked. */
|
2520 |
|
|
EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
|
2521 |
|
|
ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1);
|
2522 |
|
|
unlock_super(sb);
|
2523 |
|
|
jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
|
2524 |
|
|
}
|
2525 |
|
|
}
|
2526 |
|
|
|
2527 |
|
|
static int ext4_remount (struct super_block * sb, int * flags, char * data)
|
2528 |
|
|
{
|
2529 |
|
|
struct ext4_super_block * es;
|
2530 |
|
|
struct ext4_sb_info *sbi = EXT4_SB(sb);
|
2531 |
|
|
ext4_fsblk_t n_blocks_count = 0;
|
2532 |
|
|
unsigned long old_sb_flags;
|
2533 |
|
|
struct ext4_mount_options old_opts;
|
2534 |
|
|
int err;
|
2535 |
|
|
#ifdef CONFIG_QUOTA
|
2536 |
|
|
int i;
|
2537 |
|
|
#endif
|
2538 |
|
|
|
2539 |
|
|
/* Store the original options */
|
2540 |
|
|
old_sb_flags = sb->s_flags;
|
2541 |
|
|
old_opts.s_mount_opt = sbi->s_mount_opt;
|
2542 |
|
|
old_opts.s_resuid = sbi->s_resuid;
|
2543 |
|
|
old_opts.s_resgid = sbi->s_resgid;
|
2544 |
|
|
old_opts.s_commit_interval = sbi->s_commit_interval;
|
2545 |
|
|
#ifdef CONFIG_QUOTA
|
2546 |
|
|
old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
|
2547 |
|
|
for (i = 0; i < MAXQUOTAS; i++)
|
2548 |
|
|
old_opts.s_qf_names[i] = sbi->s_qf_names[i];
|
2549 |
|
|
#endif
|
2550 |
|
|
|
2551 |
|
|
/*
|
2552 |
|
|
* Allow the "check" option to be passed as a remount option.
|
2553 |
|
|
*/
|
2554 |
|
|
if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
|
2555 |
|
|
err = -EINVAL;
|
2556 |
|
|
goto restore_opts;
|
2557 |
|
|
}
|
2558 |
|
|
|
2559 |
|
|
if (sbi->s_mount_opt & EXT4_MOUNT_ABORT)
|
2560 |
|
|
ext4_abort(sb, __FUNCTION__, "Abort forced by user");
|
2561 |
|
|
|
2562 |
|
|
sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
|
2563 |
|
|
((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
|
2564 |
|
|
|
2565 |
|
|
es = sbi->s_es;
|
2566 |
|
|
|
2567 |
|
|
ext4_init_journal_params(sb, sbi->s_journal);
|
2568 |
|
|
|
2569 |
|
|
if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
|
2570 |
|
|
n_blocks_count > ext4_blocks_count(es)) {
|
2571 |
|
|
if (sbi->s_mount_opt & EXT4_MOUNT_ABORT) {
|
2572 |
|
|
err = -EROFS;
|
2573 |
|
|
goto restore_opts;
|
2574 |
|
|
}
|
2575 |
|
|
|
2576 |
|
|
if (*flags & MS_RDONLY) {
|
2577 |
|
|
/*
|
2578 |
|
|
* First of all, the unconditional stuff we have to do
|
2579 |
|
|
* to disable replay of the journal when we next remount
|
2580 |
|
|
*/
|
2581 |
|
|
sb->s_flags |= MS_RDONLY;
|
2582 |
|
|
|
2583 |
|
|
/*
|
2584 |
|
|
* OK, test if we are remounting a valid rw partition
|
2585 |
|
|
* readonly, and if so set the rdonly flag and then
|
2586 |
|
|
* mark the partition as valid again.
|
2587 |
|
|
*/
|
2588 |
|
|
if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
|
2589 |
|
|
(sbi->s_mount_state & EXT4_VALID_FS))
|
2590 |
|
|
es->s_state = cpu_to_le16(sbi->s_mount_state);
|
2591 |
|
|
|
2592 |
|
|
/*
|
2593 |
|
|
* We have to unlock super so that we can wait for
|
2594 |
|
|
* transactions.
|
2595 |
|
|
*/
|
2596 |
|
|
unlock_super(sb);
|
2597 |
|
|
ext4_mark_recovery_complete(sb, es);
|
2598 |
|
|
lock_super(sb);
|
2599 |
|
|
} else {
|
2600 |
|
|
__le32 ret;
|
2601 |
|
|
if ((ret = EXT4_HAS_RO_COMPAT_FEATURE(sb,
|
2602 |
|
|
~EXT4_FEATURE_RO_COMPAT_SUPP))) {
|
2603 |
|
|
printk(KERN_WARNING "EXT4-fs: %s: couldn't "
|
2604 |
|
|
"remount RDWR because of unsupported "
|
2605 |
|
|
"optional features (%x).\n",
|
2606 |
|
|
sb->s_id, le32_to_cpu(ret));
|
2607 |
|
|
err = -EROFS;
|
2608 |
|
|
goto restore_opts;
|
2609 |
|
|
}
|
2610 |
|
|
|
2611 |
|
|
/*
|
2612 |
|
|
* If we have an unprocessed orphan list hanging
|
2613 |
|
|
* around from a previously readonly bdev mount,
|
2614 |
|
|
* require a full umount/remount for now.
|
2615 |
|
|
*/
|
2616 |
|
|
if (es->s_last_orphan) {
|
2617 |
|
|
printk(KERN_WARNING "EXT4-fs: %s: couldn't "
|
2618 |
|
|
"remount RDWR because of unprocessed "
|
2619 |
|
|
"orphan inode list. Please "
|
2620 |
|
|
"umount/remount instead.\n",
|
2621 |
|
|
sb->s_id);
|
2622 |
|
|
err = -EINVAL;
|
2623 |
|
|
goto restore_opts;
|
2624 |
|
|
}
|
2625 |
|
|
|
2626 |
|
|
/*
|
2627 |
|
|
* Mounting a RDONLY partition read-write, so reread
|
2628 |
|
|
* and store the current valid flag. (It may have
|
2629 |
|
|
* been changed by e2fsck since we originally mounted
|
2630 |
|
|
* the partition.)
|
2631 |
|
|
*/
|
2632 |
|
|
ext4_clear_journal_err(sb, es);
|
2633 |
|
|
sbi->s_mount_state = le16_to_cpu(es->s_state);
|
2634 |
|
|
if ((err = ext4_group_extend(sb, es, n_blocks_count)))
|
2635 |
|
|
goto restore_opts;
|
2636 |
|
|
if (!ext4_setup_super (sb, es, 0))
|
2637 |
|
|
sb->s_flags &= ~MS_RDONLY;
|
2638 |
|
|
}
|
2639 |
|
|
}
|
2640 |
|
|
#ifdef CONFIG_QUOTA
|
2641 |
|
|
/* Release old quota file names */
|
2642 |
|
|
for (i = 0; i < MAXQUOTAS; i++)
|
2643 |
|
|
if (old_opts.s_qf_names[i] &&
|
2644 |
|
|
old_opts.s_qf_names[i] != sbi->s_qf_names[i])
|
2645 |
|
|
kfree(old_opts.s_qf_names[i]);
|
2646 |
|
|
#endif
|
2647 |
|
|
return 0;
|
2648 |
|
|
restore_opts:
|
2649 |
|
|
sb->s_flags = old_sb_flags;
|
2650 |
|
|
sbi->s_mount_opt = old_opts.s_mount_opt;
|
2651 |
|
|
sbi->s_resuid = old_opts.s_resuid;
|
2652 |
|
|
sbi->s_resgid = old_opts.s_resgid;
|
2653 |
|
|
sbi->s_commit_interval = old_opts.s_commit_interval;
|
2654 |
|
|
#ifdef CONFIG_QUOTA
|
2655 |
|
|
sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
|
2656 |
|
|
for (i = 0; i < MAXQUOTAS; i++) {
|
2657 |
|
|
if (sbi->s_qf_names[i] &&
|
2658 |
|
|
old_opts.s_qf_names[i] != sbi->s_qf_names[i])
|
2659 |
|
|
kfree(sbi->s_qf_names[i]);
|
2660 |
|
|
sbi->s_qf_names[i] = old_opts.s_qf_names[i];
|
2661 |
|
|
}
|
2662 |
|
|
#endif
|
2663 |
|
|
return err;
|
2664 |
|
|
}
|
2665 |
|
|
|
2666 |
|
|
static int ext4_statfs (struct dentry * dentry, struct kstatfs * buf)
|
2667 |
|
|
{
|
2668 |
|
|
struct super_block *sb = dentry->d_sb;
|
2669 |
|
|
struct ext4_sb_info *sbi = EXT4_SB(sb);
|
2670 |
|
|
struct ext4_super_block *es = sbi->s_es;
|
2671 |
|
|
u64 fsid;
|
2672 |
|
|
|
2673 |
|
|
if (test_opt(sb, MINIX_DF)) {
|
2674 |
|
|
sbi->s_overhead_last = 0;
|
2675 |
|
|
} else if (sbi->s_blocks_last != ext4_blocks_count(es)) {
|
2676 |
|
|
unsigned long ngroups = sbi->s_groups_count, i;
|
2677 |
|
|
ext4_fsblk_t overhead = 0;
|
2678 |
|
|
smp_rmb();
|
2679 |
|
|
|
2680 |
|
|
/*
|
2681 |
|
|
* Compute the overhead (FS structures). This is constant
|
2682 |
|
|
* for a given filesystem unless the number of block groups
|
2683 |
|
|
* changes so we cache the previous value until it does.
|
2684 |
|
|
*/
|
2685 |
|
|
|
2686 |
|
|
/*
|
2687 |
|
|
* All of the blocks before first_data_block are
|
2688 |
|
|
* overhead
|
2689 |
|
|
*/
|
2690 |
|
|
overhead = le32_to_cpu(es->s_first_data_block);
|
2691 |
|
|
|
2692 |
|
|
/*
|
2693 |
|
|
* Add the overhead attributed to the superblock and
|
2694 |
|
|
* block group descriptors. If the sparse superblocks
|
2695 |
|
|
* feature is turned on, then not all groups have this.
|
2696 |
|
|
*/
|
2697 |
|
|
for (i = 0; i < ngroups; i++) {
|
2698 |
|
|
overhead += ext4_bg_has_super(sb, i) +
|
2699 |
|
|
ext4_bg_num_gdb(sb, i);
|
2700 |
|
|
cond_resched();
|
2701 |
|
|
}
|
2702 |
|
|
|
2703 |
|
|
/*
|
2704 |
|
|
* Every block group has an inode bitmap, a block
|
2705 |
|
|
* bitmap, and an inode table.
|
2706 |
|
|
*/
|
2707 |
|
|
overhead += ngroups * (2 + sbi->s_itb_per_group);
|
2708 |
|
|
sbi->s_overhead_last = overhead;
|
2709 |
|
|
smp_wmb();
|
2710 |
|
|
sbi->s_blocks_last = ext4_blocks_count(es);
|
2711 |
|
|
}
|
2712 |
|
|
|
2713 |
|
|
buf->f_type = EXT4_SUPER_MAGIC;
|
2714 |
|
|
buf->f_bsize = sb->s_blocksize;
|
2715 |
|
|
buf->f_blocks = ext4_blocks_count(es) - sbi->s_overhead_last;
|
2716 |
|
|
buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter);
|
2717 |
|
|
ext4_free_blocks_count_set(es, buf->f_bfree);
|
2718 |
|
|
buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es);
|
2719 |
|
|
if (buf->f_bfree < ext4_r_blocks_count(es))
|
2720 |
|
|
buf->f_bavail = 0;
|
2721 |
|
|
buf->f_files = le32_to_cpu(es->s_inodes_count);
|
2722 |
|
|
buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
|
2723 |
|
|
es->s_free_inodes_count = cpu_to_le32(buf->f_ffree);
|
2724 |
|
|
buf->f_namelen = EXT4_NAME_LEN;
|
2725 |
|
|
fsid = le64_to_cpup((void *)es->s_uuid) ^
|
2726 |
|
|
le64_to_cpup((void *)es->s_uuid + sizeof(u64));
|
2727 |
|
|
buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
|
2728 |
|
|
buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
|
2729 |
|
|
return 0;
|
2730 |
|
|
}
|
2731 |
|
|
|
2732 |
|
|
/* Helper function for writing quotas on sync - we need to start transaction before quota file
|
2733 |
|
|
* is locked for write. Otherwise the are possible deadlocks:
|
2734 |
|
|
* Process 1 Process 2
|
2735 |
|
|
* ext4_create() quota_sync()
|
2736 |
|
|
* jbd2_journal_start() write_dquot()
|
2737 |
|
|
* DQUOT_INIT() down(dqio_mutex)
|
2738 |
|
|
* down(dqio_mutex) jbd2_journal_start()
|
2739 |
|
|
*
|
2740 |
|
|
*/
|
2741 |
|
|
|
2742 |
|
|
#ifdef CONFIG_QUOTA
|
2743 |
|
|
|
2744 |
|
|
static inline struct inode *dquot_to_inode(struct dquot *dquot)
|
2745 |
|
|
{
|
2746 |
|
|
return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
|
2747 |
|
|
}
|
2748 |
|
|
|
2749 |
|
|
static int ext4_dquot_initialize(struct inode *inode, int type)
|
2750 |
|
|
{
|
2751 |
|
|
handle_t *handle;
|
2752 |
|
|
int ret, err;
|
2753 |
|
|
|
2754 |
|
|
/* We may create quota structure so we need to reserve enough blocks */
|
2755 |
|
|
handle = ext4_journal_start(inode, 2*EXT4_QUOTA_INIT_BLOCKS(inode->i_sb));
|
2756 |
|
|
if (IS_ERR(handle))
|
2757 |
|
|
return PTR_ERR(handle);
|
2758 |
|
|
ret = dquot_initialize(inode, type);
|
2759 |
|
|
err = ext4_journal_stop(handle);
|
2760 |
|
|
if (!ret)
|
2761 |
|
|
ret = err;
|
2762 |
|
|
return ret;
|
2763 |
|
|
}
|
2764 |
|
|
|
2765 |
|
|
static int ext4_dquot_drop(struct inode *inode)
|
2766 |
|
|
{
|
2767 |
|
|
handle_t *handle;
|
2768 |
|
|
int ret, err;
|
2769 |
|
|
|
2770 |
|
|
/* We may delete quota structure so we need to reserve enough blocks */
|
2771 |
|
|
handle = ext4_journal_start(inode, 2*EXT4_QUOTA_DEL_BLOCKS(inode->i_sb));
|
2772 |
|
|
if (IS_ERR(handle))
|
2773 |
|
|
return PTR_ERR(handle);
|
2774 |
|
|
ret = dquot_drop(inode);
|
2775 |
|
|
err = ext4_journal_stop(handle);
|
2776 |
|
|
if (!ret)
|
2777 |
|
|
ret = err;
|
2778 |
|
|
return ret;
|
2779 |
|
|
}
|
2780 |
|
|
|
2781 |
|
|
static int ext4_write_dquot(struct dquot *dquot)
|
2782 |
|
|
{
|
2783 |
|
|
int ret, err;
|
2784 |
|
|
handle_t *handle;
|
2785 |
|
|
struct inode *inode;
|
2786 |
|
|
|
2787 |
|
|
inode = dquot_to_inode(dquot);
|
2788 |
|
|
handle = ext4_journal_start(inode,
|
2789 |
|
|
EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
|
2790 |
|
|
if (IS_ERR(handle))
|
2791 |
|
|
return PTR_ERR(handle);
|
2792 |
|
|
ret = dquot_commit(dquot);
|
2793 |
|
|
err = ext4_journal_stop(handle);
|
2794 |
|
|
if (!ret)
|
2795 |
|
|
ret = err;
|
2796 |
|
|
return ret;
|
2797 |
|
|
}
|
2798 |
|
|
|
2799 |
|
|
static int ext4_acquire_dquot(struct dquot *dquot)
|
2800 |
|
|
{
|
2801 |
|
|
int ret, err;
|
2802 |
|
|
handle_t *handle;
|
2803 |
|
|
|
2804 |
|
|
handle = ext4_journal_start(dquot_to_inode(dquot),
|
2805 |
|
|
EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
|
2806 |
|
|
if (IS_ERR(handle))
|
2807 |
|
|
return PTR_ERR(handle);
|
2808 |
|
|
ret = dquot_acquire(dquot);
|
2809 |
|
|
err = ext4_journal_stop(handle);
|
2810 |
|
|
if (!ret)
|
2811 |
|
|
ret = err;
|
2812 |
|
|
return ret;
|
2813 |
|
|
}
|
2814 |
|
|
|
2815 |
|
|
static int ext4_release_dquot(struct dquot *dquot)
|
2816 |
|
|
{
|
2817 |
|
|
int ret, err;
|
2818 |
|
|
handle_t *handle;
|
2819 |
|
|
|
2820 |
|
|
handle = ext4_journal_start(dquot_to_inode(dquot),
|
2821 |
|
|
EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
|
2822 |
|
|
if (IS_ERR(handle)) {
|
2823 |
|
|
/* Release dquot anyway to avoid endless cycle in dqput() */
|
2824 |
|
|
dquot_release(dquot);
|
2825 |
|
|
return PTR_ERR(handle);
|
2826 |
|
|
}
|
2827 |
|
|
ret = dquot_release(dquot);
|
2828 |
|
|
err = ext4_journal_stop(handle);
|
2829 |
|
|
if (!ret)
|
2830 |
|
|
ret = err;
|
2831 |
|
|
return ret;
|
2832 |
|
|
}
|
2833 |
|
|
|
2834 |
|
|
static int ext4_mark_dquot_dirty(struct dquot *dquot)
|
2835 |
|
|
{
|
2836 |
|
|
/* Are we journalling quotas? */
|
2837 |
|
|
if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
|
2838 |
|
|
EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
|
2839 |
|
|
dquot_mark_dquot_dirty(dquot);
|
2840 |
|
|
return ext4_write_dquot(dquot);
|
2841 |
|
|
} else {
|
2842 |
|
|
return dquot_mark_dquot_dirty(dquot);
|
2843 |
|
|
}
|
2844 |
|
|
}
|
2845 |
|
|
|
2846 |
|
|
static int ext4_write_info(struct super_block *sb, int type)
|
2847 |
|
|
{
|
2848 |
|
|
int ret, err;
|
2849 |
|
|
handle_t *handle;
|
2850 |
|
|
|
2851 |
|
|
/* Data block + inode block */
|
2852 |
|
|
handle = ext4_journal_start(sb->s_root->d_inode, 2);
|
2853 |
|
|
if (IS_ERR(handle))
|
2854 |
|
|
return PTR_ERR(handle);
|
2855 |
|
|
ret = dquot_commit_info(sb, type);
|
2856 |
|
|
err = ext4_journal_stop(handle);
|
2857 |
|
|
if (!ret)
|
2858 |
|
|
ret = err;
|
2859 |
|
|
return ret;
|
2860 |
|
|
}
|
2861 |
|
|
|
2862 |
|
|
/*
|
2863 |
|
|
* Turn on quotas during mount time - we need to find
|
2864 |
|
|
* the quota file and such...
|
2865 |
|
|
*/
|
2866 |
|
|
static int ext4_quota_on_mount(struct super_block *sb, int type)
|
2867 |
|
|
{
|
2868 |
|
|
return vfs_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
|
2869 |
|
|
EXT4_SB(sb)->s_jquota_fmt, type);
|
2870 |
|
|
}
|
2871 |
|
|
|
2872 |
|
|
/*
|
2873 |
|
|
* Standard function to be called on quota_on
|
2874 |
|
|
*/
|
2875 |
|
|
static int ext4_quota_on(struct super_block *sb, int type, int format_id,
|
2876 |
|
|
char *path)
|
2877 |
|
|
{
|
2878 |
|
|
int err;
|
2879 |
|
|
struct nameidata nd;
|
2880 |
|
|
|
2881 |
|
|
if (!test_opt(sb, QUOTA))
|
2882 |
|
|
return -EINVAL;
|
2883 |
|
|
/* Not journalling quota? */
|
2884 |
|
|
if (!EXT4_SB(sb)->s_qf_names[USRQUOTA] &&
|
2885 |
|
|
!EXT4_SB(sb)->s_qf_names[GRPQUOTA])
|
2886 |
|
|
return vfs_quota_on(sb, type, format_id, path);
|
2887 |
|
|
err = path_lookup(path, LOOKUP_FOLLOW, &nd);
|
2888 |
|
|
if (err)
|
2889 |
|
|
return err;
|
2890 |
|
|
/* Quotafile not on the same filesystem? */
|
2891 |
|
|
if (nd.mnt->mnt_sb != sb) {
|
2892 |
|
|
path_release(&nd);
|
2893 |
|
|
return -EXDEV;
|
2894 |
|
|
}
|
2895 |
|
|
/* Quotafile not of fs root? */
|
2896 |
|
|
if (nd.dentry->d_parent->d_inode != sb->s_root->d_inode)
|
2897 |
|
|
printk(KERN_WARNING
|
2898 |
|
|
"EXT4-fs: Quota file not on filesystem root. "
|
2899 |
|
|
"Journalled quota will not work.\n");
|
2900 |
|
|
path_release(&nd);
|
2901 |
|
|
return vfs_quota_on(sb, type, format_id, path);
|
2902 |
|
|
}
|
2903 |
|
|
|
2904 |
|
|
/* Read data from quotafile - avoid pagecache and such because we cannot afford
|
2905 |
|
|
* acquiring the locks... As quota files are never truncated and quota code
|
2906 |
|
|
* itself serializes the operations (and noone else should touch the files)
|
2907 |
|
|
* we don't have to be afraid of races */
|
2908 |
|
|
static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
|
2909 |
|
|
size_t len, loff_t off)
|
2910 |
|
|
{
|
2911 |
|
|
struct inode *inode = sb_dqopt(sb)->files[type];
|
2912 |
|
|
sector_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
|
2913 |
|
|
int err = 0;
|
2914 |
|
|
int offset = off & (sb->s_blocksize - 1);
|
2915 |
|
|
int tocopy;
|
2916 |
|
|
size_t toread;
|
2917 |
|
|
struct buffer_head *bh;
|
2918 |
|
|
loff_t i_size = i_size_read(inode);
|
2919 |
|
|
|
2920 |
|
|
if (off > i_size)
|
2921 |
|
|
return 0;
|
2922 |
|
|
if (off+len > i_size)
|
2923 |
|
|
len = i_size-off;
|
2924 |
|
|
toread = len;
|
2925 |
|
|
while (toread > 0) {
|
2926 |
|
|
tocopy = sb->s_blocksize - offset < toread ?
|
2927 |
|
|
sb->s_blocksize - offset : toread;
|
2928 |
|
|
bh = ext4_bread(NULL, inode, blk, 0, &err);
|
2929 |
|
|
if (err)
|
2930 |
|
|
return err;
|
2931 |
|
|
if (!bh) /* A hole? */
|
2932 |
|
|
memset(data, 0, tocopy);
|
2933 |
|
|
else
|
2934 |
|
|
memcpy(data, bh->b_data+offset, tocopy);
|
2935 |
|
|
brelse(bh);
|
2936 |
|
|
offset = 0;
|
2937 |
|
|
toread -= tocopy;
|
2938 |
|
|
data += tocopy;
|
2939 |
|
|
blk++;
|
2940 |
|
|
}
|
2941 |
|
|
return len;
|
2942 |
|
|
}
|
2943 |
|
|
|
2944 |
|
|
/* Write to quotafile (we know the transaction is already started and has
|
2945 |
|
|
* enough credits) */
|
2946 |
|
|
static ssize_t ext4_quota_write(struct super_block *sb, int type,
|
2947 |
|
|
const char *data, size_t len, loff_t off)
|
2948 |
|
|
{
|
2949 |
|
|
struct inode *inode = sb_dqopt(sb)->files[type];
|
2950 |
|
|
sector_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
|
2951 |
|
|
int err = 0;
|
2952 |
|
|
int offset = off & (sb->s_blocksize - 1);
|
2953 |
|
|
int tocopy;
|
2954 |
|
|
int journal_quota = EXT4_SB(sb)->s_qf_names[type] != NULL;
|
2955 |
|
|
size_t towrite = len;
|
2956 |
|
|
struct buffer_head *bh;
|
2957 |
|
|
handle_t *handle = journal_current_handle();
|
2958 |
|
|
|
2959 |
|
|
if (!handle) {
|
2960 |
|
|
printk(KERN_WARNING "EXT4-fs: Quota write (off=%Lu, len=%Lu)"
|
2961 |
|
|
" cancelled because transaction is not started.\n",
|
2962 |
|
|
(unsigned long long)off, (unsigned long long)len);
|
2963 |
|
|
return -EIO;
|
2964 |
|
|
}
|
2965 |
|
|
mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
|
2966 |
|
|
while (towrite > 0) {
|
2967 |
|
|
tocopy = sb->s_blocksize - offset < towrite ?
|
2968 |
|
|
sb->s_blocksize - offset : towrite;
|
2969 |
|
|
bh = ext4_bread(handle, inode, blk, 1, &err);
|
2970 |
|
|
if (!bh)
|
2971 |
|
|
goto out;
|
2972 |
|
|
if (journal_quota) {
|
2973 |
|
|
err = ext4_journal_get_write_access(handle, bh);
|
2974 |
|
|
if (err) {
|
2975 |
|
|
brelse(bh);
|
2976 |
|
|
goto out;
|
2977 |
|
|
}
|
2978 |
|
|
}
|
2979 |
|
|
lock_buffer(bh);
|
2980 |
|
|
memcpy(bh->b_data+offset, data, tocopy);
|
2981 |
|
|
flush_dcache_page(bh->b_page);
|
2982 |
|
|
unlock_buffer(bh);
|
2983 |
|
|
if (journal_quota)
|
2984 |
|
|
err = ext4_journal_dirty_metadata(handle, bh);
|
2985 |
|
|
else {
|
2986 |
|
|
/* Always do at least ordered writes for quotas */
|
2987 |
|
|
err = ext4_journal_dirty_data(handle, bh);
|
2988 |
|
|
mark_buffer_dirty(bh);
|
2989 |
|
|
}
|
2990 |
|
|
brelse(bh);
|
2991 |
|
|
if (err)
|
2992 |
|
|
goto out;
|
2993 |
|
|
offset = 0;
|
2994 |
|
|
towrite -= tocopy;
|
2995 |
|
|
data += tocopy;
|
2996 |
|
|
blk++;
|
2997 |
|
|
}
|
2998 |
|
|
out:
|
2999 |
|
|
if (len == towrite)
|
3000 |
|
|
return err;
|
3001 |
|
|
if (inode->i_size < off+len-towrite) {
|
3002 |
|
|
i_size_write(inode, off+len-towrite);
|
3003 |
|
|
EXT4_I(inode)->i_disksize = inode->i_size;
|
3004 |
|
|
}
|
3005 |
|
|
inode->i_version++;
|
3006 |
|
|
inode->i_mtime = inode->i_ctime = CURRENT_TIME;
|
3007 |
|
|
ext4_mark_inode_dirty(handle, inode);
|
3008 |
|
|
mutex_unlock(&inode->i_mutex);
|
3009 |
|
|
return len - towrite;
|
3010 |
|
|
}
|
3011 |
|
|
|
3012 |
|
|
#endif
|
3013 |
|
|
|
3014 |
|
|
static int ext4_get_sb(struct file_system_type *fs_type,
|
3015 |
|
|
int flags, const char *dev_name, void *data, struct vfsmount *mnt)
|
3016 |
|
|
{
|
3017 |
|
|
return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super, mnt);
|
3018 |
|
|
}
|
3019 |
|
|
|
3020 |
|
|
static struct file_system_type ext4dev_fs_type = {
|
3021 |
|
|
.owner = THIS_MODULE,
|
3022 |
|
|
.name = "ext4dev",
|
3023 |
|
|
.get_sb = ext4_get_sb,
|
3024 |
|
|
.kill_sb = kill_block_super,
|
3025 |
|
|
.fs_flags = FS_REQUIRES_DEV,
|
3026 |
|
|
};
|
3027 |
|
|
|
3028 |
|
|
static int __init init_ext4_fs(void)
|
3029 |
|
|
{
|
3030 |
|
|
int err = init_ext4_xattr();
|
3031 |
|
|
if (err)
|
3032 |
|
|
return err;
|
3033 |
|
|
err = init_inodecache();
|
3034 |
|
|
if (err)
|
3035 |
|
|
goto out1;
|
3036 |
|
|
err = register_filesystem(&ext4dev_fs_type);
|
3037 |
|
|
if (err)
|
3038 |
|
|
goto out;
|
3039 |
|
|
return 0;
|
3040 |
|
|
out:
|
3041 |
|
|
destroy_inodecache();
|
3042 |
|
|
out1:
|
3043 |
|
|
exit_ext4_xattr();
|
3044 |
|
|
return err;
|
3045 |
|
|
}
|
3046 |
|
|
|
3047 |
|
|
static void __exit exit_ext4_fs(void)
|
3048 |
|
|
{
|
3049 |
|
|
unregister_filesystem(&ext4dev_fs_type);
|
3050 |
|
|
destroy_inodecache();
|
3051 |
|
|
exit_ext4_xattr();
|
3052 |
|
|
}
|
3053 |
|
|
|
3054 |
|
|
MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
|
3055 |
|
|
MODULE_DESCRIPTION("Fourth Extended Filesystem with extents");
|
3056 |
|
|
MODULE_LICENSE("GPL");
|
3057 |
|
|
module_init(init_ext4_fs)
|
3058 |
|
|
module_exit(exit_ext4_fs)
|