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1628 |
jcastillo |
/*
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| 2 |
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* linux/fs/ext2/ialloc.c
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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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* BSD ufs-inspired inode and directory allocation by
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* Stephen Tweedie (sct@dcs.ed.ac.uk), 1993
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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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/*
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* ialloc.c contains the inodes allocation and deallocation routines
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*/
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/*
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* The free inodes are managed by bitmaps. A file system contains several
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* blocks groups. Each group contains 1 bitmap block for blocks, 1 bitmap
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* block for inodes, N blocks for the inode table and data blocks.
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*
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* The file system contains group descriptors which are located after the
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* super block. Each descriptor contains the number of the bitmap block and
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* the free blocks count in the block. The descriptors are loaded in memory
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* when a file system is mounted (see ext2_read_super).
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*/
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#include <linux/fs.h>
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#include <linux/ext2_fs.h>
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#include <linux/sched.h>
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#include <linux/stat.h>
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#include <linux/string.h>
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#include <linux/locks.h>
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#include <asm/bitops.h>
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#include <asm/byteorder.h>
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static struct ext2_group_desc * get_group_desc (struct super_block * sb,
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unsigned int block_group,
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struct buffer_head ** bh)
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{
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unsigned long group_desc;
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unsigned long desc;
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struct ext2_group_desc * gdp;
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if (block_group >= sb->u.ext2_sb.s_groups_count)
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ext2_panic (sb, "get_group_desc",
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"block_group >= groups_count - "
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"block_group = %d, groups_count = %lu",
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block_group, sb->u.ext2_sb.s_groups_count);
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group_desc = block_group / EXT2_DESC_PER_BLOCK(sb);
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desc = block_group % EXT2_DESC_PER_BLOCK(sb);
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if (!sb->u.ext2_sb.s_group_desc[group_desc])
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ext2_panic (sb, "get_group_desc",
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"Group descriptor not loaded - "
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"block_group = %d, group_desc = %lu, desc = %lu",
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block_group, group_desc, desc);
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gdp = (struct ext2_group_desc *)
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sb->u.ext2_sb.s_group_desc[group_desc]->b_data;
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if (bh)
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*bh = sb->u.ext2_sb.s_group_desc[group_desc];
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return gdp + desc;
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}
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/*
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* Read the inode allocation bitmap for a given block_group, reading
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* into the specified slot in the superblock's bitmap cache.
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*
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* Return >=0 on success or a -ve error code.
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*/
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static int read_inode_bitmap (struct super_block * sb,
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unsigned long block_group,
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unsigned int bitmap_nr)
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{
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struct ext2_group_desc * gdp;
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struct buffer_head * bh;
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int retval = 0;
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gdp = get_group_desc (sb, block_group, NULL);
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bh = bread (sb->s_dev, swab32(gdp->bg_inode_bitmap), sb->s_blocksize);
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if (!bh) {
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ext2_error (sb, "read_inode_bitmap",
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"Cannot read inode bitmap - "
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"block_group = %lu, inode_bitmap = %lu",
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block_group, (unsigned long) swab32(gdp->bg_inode_bitmap));
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retval = -EIO;
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}
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/*
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* On IO error, just leave a zero in the superblock's block pointer for
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* this group. The IO will be retried next time.
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*/
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sb->u.ext2_sb.s_inode_bitmap_number[bitmap_nr] = block_group;
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sb->u.ext2_sb.s_inode_bitmap[bitmap_nr] = bh;
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return retval;
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}
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/*
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* load_inode_bitmap loads the inode bitmap for a blocks group
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*
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* It maintains a cache for the last bitmaps loaded. This cache is managed
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* with a LRU algorithm.
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*
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* Notes:
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* 1/ There is one cache per mounted file system.
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* 2/ If the file system contains less than EXT2_MAX_GROUP_LOADED groups,
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* this function reads the bitmap without maintaining a LRU cache.
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*
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* Return the slot used to store the bitmap, or a -ve error code.
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*/
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static int load_inode_bitmap (struct super_block * sb,
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unsigned int block_group)
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{
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int i, j, retval = 0;
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unsigned long inode_bitmap_number;
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struct buffer_head * inode_bitmap;
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if (block_group >= sb->u.ext2_sb.s_groups_count)
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ext2_panic (sb, "load_inode_bitmap",
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"block_group >= groups_count - "
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"block_group = %d, groups_count = %lu",
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block_group, sb->u.ext2_sb.s_groups_count);
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if (sb->u.ext2_sb.s_loaded_inode_bitmaps > 0 &&
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sb->u.ext2_sb.s_inode_bitmap_number[0] == block_group)
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return 0;
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if (sb->u.ext2_sb.s_groups_count <= EXT2_MAX_GROUP_LOADED) {
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if (sb->u.ext2_sb.s_inode_bitmap[block_group]) {
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if (sb->u.ext2_sb.s_inode_bitmap_number[block_group] != block_group)
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ext2_panic (sb, "load_inode_bitmap",
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"block_group != inode_bitmap_number");
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else
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return block_group;
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} else {
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retval = read_inode_bitmap (sb, block_group, block_group);
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if (retval < 0)
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return retval;
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return block_group;
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}
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}
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| 144 |
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for (i = 0; i < sb->u.ext2_sb.s_loaded_inode_bitmaps &&
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sb->u.ext2_sb.s_inode_bitmap_number[i] != block_group;
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i++)
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;
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if (i < sb->u.ext2_sb.s_loaded_inode_bitmaps &&
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sb->u.ext2_sb.s_inode_bitmap_number[i] == block_group) {
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inode_bitmap_number = sb->u.ext2_sb.s_inode_bitmap_number[i];
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inode_bitmap = sb->u.ext2_sb.s_inode_bitmap[i];
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for (j = i; j > 0; j--) {
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sb->u.ext2_sb.s_inode_bitmap_number[j] =
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sb->u.ext2_sb.s_inode_bitmap_number[j - 1];
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sb->u.ext2_sb.s_inode_bitmap[j] =
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sb->u.ext2_sb.s_inode_bitmap[j - 1];
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}
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sb->u.ext2_sb.s_inode_bitmap_number[0] = inode_bitmap_number;
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sb->u.ext2_sb.s_inode_bitmap[0] = inode_bitmap;
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/*
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* There's still one special case here --- if inode_bitmap == 0
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* then our last attempt to read the bitmap failed and we have
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| 164 |
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* just ended up caching that failure. Try again to read it.
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| 165 |
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*/
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if (!inode_bitmap)
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retval = read_inode_bitmap (sb, block_group, 0);
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} else {
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if (sb->u.ext2_sb.s_loaded_inode_bitmaps < EXT2_MAX_GROUP_LOADED)
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sb->u.ext2_sb.s_loaded_inode_bitmaps++;
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else
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brelse (sb->u.ext2_sb.s_inode_bitmap[EXT2_MAX_GROUP_LOADED - 1]);
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for (j = sb->u.ext2_sb.s_loaded_inode_bitmaps - 1; j > 0; j--) {
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sb->u.ext2_sb.s_inode_bitmap_number[j] =
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| 175 |
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sb->u.ext2_sb.s_inode_bitmap_number[j - 1];
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| 176 |
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sb->u.ext2_sb.s_inode_bitmap[j] =
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| 177 |
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sb->u.ext2_sb.s_inode_bitmap[j - 1];
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| 178 |
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}
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| 179 |
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retval = read_inode_bitmap (sb, block_group, 0);
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| 180 |
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}
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| 181 |
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return retval;
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| 182 |
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}
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| 183 |
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| 184 |
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void ext2_free_inode (struct inode * inode)
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| 185 |
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{
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| 186 |
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struct super_block * sb;
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| 187 |
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struct buffer_head * bh;
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| 188 |
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struct buffer_head * bh2;
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| 189 |
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unsigned long block_group;
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| 190 |
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unsigned long bit;
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| 191 |
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int bitmap_nr;
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| 192 |
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struct ext2_group_desc * gdp;
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| 193 |
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struct ext2_super_block * es;
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| 194 |
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| 195 |
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if (!inode)
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| 196 |
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return;
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| 197 |
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if (!inode->i_dev) {
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| 198 |
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printk ("ext2_free_inode: inode has no device\n");
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| 199 |
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return;
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| 200 |
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}
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| 201 |
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if (inode->i_count > 1) {
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| 202 |
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printk ("ext2_free_inode: inode has count=%ld\n",
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| 203 |
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inode->i_count);
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| 204 |
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return;
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| 205 |
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}
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| 206 |
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if (inode->i_nlink) {
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| 207 |
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printk ("ext2_free_inode: inode has nlink=%d\n",
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| 208 |
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inode->i_nlink);
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| 209 |
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return;
|
| 210 |
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}
|
| 211 |
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sb = inode->i_sb;
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| 212 |
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if (!sb) {
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| 213 |
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printk("ext2_free_inode: inode on nonexistent device\n");
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| 214 |
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return;
|
| 215 |
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}
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| 216 |
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|
|
| 217 |
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ext2_debug ("freeing inode %lu\n", inode->i_ino);
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| 218 |
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|
|
| 219 |
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/* We need to kill quota references now, before grabbing the
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| 220 |
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* superblock lock because writing the quota out to disk
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| 221 |
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* may need to lock the superblock as well.
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| 222 |
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*
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| 223 |
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* It is safe to do this early instead of the original
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| 224 |
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* places because we cannot be here in ext2_free_inode
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| 225 |
|
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* if any other references to this inode exist at all.
|
| 226 |
|
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*
|
| 227 |
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* Based upon a 2.1.x fix by Bill Hawes. --DaveM
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| 228 |
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*/
|
| 229 |
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if (sb->dq_op) {
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| 230 |
|
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sb->dq_op->free_inode (inode, 1);
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| 231 |
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if (IS_WRITABLE (inode))
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| 232 |
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sb->dq_op->drop(inode);
|
| 233 |
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}
|
| 234 |
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|
| 235 |
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lock_super (sb);
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| 236 |
|
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if (inode->i_ino < EXT2_FIRST_INO(sb) ||
|
| 237 |
|
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inode->i_ino > swab32(sb->u.ext2_sb.s_es->s_inodes_count)) {
|
| 238 |
|
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ext2_error (sb, "free_inode",
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| 239 |
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"reserved inode or nonexistent inode");
|
| 240 |
|
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unlock_super (sb);
|
| 241 |
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return;
|
| 242 |
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}
|
| 243 |
|
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es = sb->u.ext2_sb.s_es;
|
| 244 |
|
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block_group = (inode->i_ino - 1) / EXT2_INODES_PER_GROUP(sb);
|
| 245 |
|
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bit = (inode->i_ino - 1) % EXT2_INODES_PER_GROUP(sb);
|
| 246 |
|
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bitmap_nr = load_inode_bitmap (sb, block_group);
|
| 247 |
|
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if (bitmap_nr < 0) {
|
| 248 |
|
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unlock_super (sb);
|
| 249 |
|
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return;
|
| 250 |
|
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}
|
| 251 |
|
|
|
| 252 |
|
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bh = sb->u.ext2_sb.s_inode_bitmap[bitmap_nr];
|
| 253 |
|
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if (!__ext2_clear_bit (bit, bh->b_data))
|
| 254 |
|
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ext2_warning (sb, "ext2_free_inode",
|
| 255 |
|
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"bit already cleared for inode %lu", inode->i_ino);
|
| 256 |
|
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else {
|
| 257 |
|
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gdp = get_group_desc (sb, block_group, &bh2);
|
| 258 |
|
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gdp->bg_free_inodes_count =
|
| 259 |
|
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swab16(swab16(gdp->bg_free_inodes_count) + 1);
|
| 260 |
|
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if (S_ISDIR(inode->i_mode))
|
| 261 |
|
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gdp->bg_used_dirs_count =
|
| 262 |
|
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swab16(swab16(gdp->bg_used_dirs_count) - 1);
|
| 263 |
|
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mark_buffer_dirty(bh2, 1);
|
| 264 |
|
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es->s_free_inodes_count =
|
| 265 |
|
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swab32(swab32(es->s_free_inodes_count) + 1);
|
| 266 |
|
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mark_buffer_dirty(sb->u.ext2_sb.s_sbh, 1);
|
| 267 |
|
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inode->i_dirt = 0;
|
| 268 |
|
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}
|
| 269 |
|
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mark_buffer_dirty(bh, 1);
|
| 270 |
|
|
if (sb->s_flags & MS_SYNCHRONOUS) {
|
| 271 |
|
|
ll_rw_block (WRITE, 1, &bh);
|
| 272 |
|
|
wait_on_buffer (bh);
|
| 273 |
|
|
}
|
| 274 |
|
|
sb->s_dirt = 1;
|
| 275 |
|
|
clear_inode (inode);
|
| 276 |
|
|
unlock_super (sb);
|
| 277 |
|
|
}
|
| 278 |
|
|
|
| 279 |
|
|
/*
|
| 280 |
|
|
* This function increments the inode version number
|
| 281 |
|
|
*
|
| 282 |
|
|
* This may be used one day by the NFS server
|
| 283 |
|
|
*/
|
| 284 |
|
|
static void inc_inode_version (struct inode * inode,
|
| 285 |
|
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struct ext2_group_desc *gdp,
|
| 286 |
|
|
int mode)
|
| 287 |
|
|
{
|
| 288 |
|
|
inode->u.ext2_i.i_version++;
|
| 289 |
|
|
inode->i_dirt = 1;
|
| 290 |
|
|
|
| 291 |
|
|
return;
|
| 292 |
|
|
}
|
| 293 |
|
|
|
| 294 |
|
|
/*
|
| 295 |
|
|
* There are two policies for allocating an inode. If the new inode is
|
| 296 |
|
|
* a directory, then a forward search is made for a block group with both
|
| 297 |
|
|
* free space and a low directory-to-inode ratio; if that fails, then of
|
| 298 |
|
|
* the groups with above-average free space, that group with the fewest
|
| 299 |
|
|
* directories already is chosen.
|
| 300 |
|
|
*
|
| 301 |
|
|
* For other inodes, search forward from the parent directory\'s block
|
| 302 |
|
|
* group to find a free inode.
|
| 303 |
|
|
*/
|
| 304 |
|
|
struct inode * ext2_new_inode (const struct inode * dir, int mode, int * err)
|
| 305 |
|
|
{
|
| 306 |
|
|
struct super_block * sb;
|
| 307 |
|
|
struct buffer_head * bh;
|
| 308 |
|
|
struct buffer_head * bh2;
|
| 309 |
|
|
int i, j, avefreei;
|
| 310 |
|
|
struct inode * inode;
|
| 311 |
|
|
int bitmap_nr;
|
| 312 |
|
|
struct ext2_group_desc * gdp;
|
| 313 |
|
|
struct ext2_group_desc * tmp;
|
| 314 |
|
|
struct ext2_super_block * es;
|
| 315 |
|
|
|
| 316 |
|
|
if (!dir || !(inode = get_empty_inode ()))
|
| 317 |
|
|
{
|
| 318 |
|
|
*err=-ENOMEM;
|
| 319 |
|
|
return NULL;
|
| 320 |
|
|
}
|
| 321 |
|
|
sb = dir->i_sb;
|
| 322 |
|
|
inode->i_sb = sb;
|
| 323 |
|
|
inode->i_flags = sb->s_flags;
|
| 324 |
|
|
lock_super (sb);
|
| 325 |
|
|
es = sb->u.ext2_sb.s_es;
|
| 326 |
|
|
repeat:
|
| 327 |
|
|
gdp = NULL; i=0;
|
| 328 |
|
|
|
| 329 |
|
|
*err = -ENOSPC;
|
| 330 |
|
|
if (S_ISDIR(mode)) {
|
| 331 |
|
|
avefreei = swab32(es->s_free_inodes_count) /
|
| 332 |
|
|
sb->u.ext2_sb.s_groups_count;
|
| 333 |
|
|
/* I am not yet convinced that this next bit is necessary.
|
| 334 |
|
|
i = dir->u.ext2_i.i_block_group;
|
| 335 |
|
|
for (j = 0; j < sb->u.ext2_sb.s_groups_count; j++) {
|
| 336 |
|
|
tmp = get_group_desc (sb, i, &bh2);
|
| 337 |
|
|
if ((swab16(tmp->bg_used_dirs_count) << 8) <
|
| 338 |
|
|
swab16(tmp->bg_free_inodes_count)) {
|
| 339 |
|
|
gdp = tmp;
|
| 340 |
|
|
break;
|
| 341 |
|
|
}
|
| 342 |
|
|
else
|
| 343 |
|
|
i = ++i % sb->u.ext2_sb.s_groups_count;
|
| 344 |
|
|
}
|
| 345 |
|
|
*/
|
| 346 |
|
|
if (!gdp) {
|
| 347 |
|
|
for (j = 0; j < sb->u.ext2_sb.s_groups_count; j++) {
|
| 348 |
|
|
tmp = get_group_desc (sb, j, &bh2);
|
| 349 |
|
|
if (swab16(tmp->bg_free_inodes_count) &&
|
| 350 |
|
|
swab16(tmp->bg_free_inodes_count) >= avefreei) {
|
| 351 |
|
|
if (!gdp ||
|
| 352 |
|
|
(swab16(tmp->bg_free_blocks_count) >
|
| 353 |
|
|
swab16(gdp->bg_free_blocks_count))) {
|
| 354 |
|
|
i = j;
|
| 355 |
|
|
gdp = tmp;
|
| 356 |
|
|
}
|
| 357 |
|
|
}
|
| 358 |
|
|
}
|
| 359 |
|
|
}
|
| 360 |
|
|
}
|
| 361 |
|
|
else
|
| 362 |
|
|
{
|
| 363 |
|
|
/*
|
| 364 |
|
|
* Try to place the inode in its parent directory
|
| 365 |
|
|
*/
|
| 366 |
|
|
i = dir->u.ext2_i.i_block_group;
|
| 367 |
|
|
tmp = get_group_desc (sb, i, &bh2);
|
| 368 |
|
|
if (swab16(tmp->bg_free_inodes_count))
|
| 369 |
|
|
gdp = tmp;
|
| 370 |
|
|
else
|
| 371 |
|
|
{
|
| 372 |
|
|
/*
|
| 373 |
|
|
* Use a quadratic hash to find a group with a
|
| 374 |
|
|
* free inode
|
| 375 |
|
|
*/
|
| 376 |
|
|
for (j = 1; j < sb->u.ext2_sb.s_groups_count; j <<= 1) {
|
| 377 |
|
|
i += j;
|
| 378 |
|
|
if (i >= sb->u.ext2_sb.s_groups_count)
|
| 379 |
|
|
i -= sb->u.ext2_sb.s_groups_count;
|
| 380 |
|
|
tmp = get_group_desc (sb, i, &bh2);
|
| 381 |
|
|
if (swab16(tmp->bg_free_inodes_count)) {
|
| 382 |
|
|
gdp = tmp;
|
| 383 |
|
|
break;
|
| 384 |
|
|
}
|
| 385 |
|
|
}
|
| 386 |
|
|
}
|
| 387 |
|
|
if (!gdp) {
|
| 388 |
|
|
/*
|
| 389 |
|
|
* That failed: try linear search for a free inode
|
| 390 |
|
|
*/
|
| 391 |
|
|
i = dir->u.ext2_i.i_block_group + 1;
|
| 392 |
|
|
for (j = 2; j < sb->u.ext2_sb.s_groups_count; j++) {
|
| 393 |
|
|
if (++i >= sb->u.ext2_sb.s_groups_count)
|
| 394 |
|
|
i = 0;
|
| 395 |
|
|
tmp = get_group_desc (sb, i, &bh2);
|
| 396 |
|
|
if (swab16(tmp->bg_free_inodes_count)) {
|
| 397 |
|
|
gdp = tmp;
|
| 398 |
|
|
break;
|
| 399 |
|
|
}
|
| 400 |
|
|
}
|
| 401 |
|
|
}
|
| 402 |
|
|
}
|
| 403 |
|
|
|
| 404 |
|
|
if (!gdp) {
|
| 405 |
|
|
unlock_super (sb);
|
| 406 |
|
|
iput(inode);
|
| 407 |
|
|
return NULL;
|
| 408 |
|
|
}
|
| 409 |
|
|
bitmap_nr = load_inode_bitmap (sb, i);
|
| 410 |
|
|
if (bitmap_nr < 0) {
|
| 411 |
|
|
unlock_super (sb);
|
| 412 |
|
|
iput(inode);
|
| 413 |
|
|
*err = -EIO;
|
| 414 |
|
|
return NULL;
|
| 415 |
|
|
}
|
| 416 |
|
|
|
| 417 |
|
|
bh = sb->u.ext2_sb.s_inode_bitmap[bitmap_nr];
|
| 418 |
|
|
if ((j = __ext2_find_first_zero_bit ((unsigned long *) bh->b_data,
|
| 419 |
|
|
EXT2_INODES_PER_GROUP(sb))) <
|
| 420 |
|
|
EXT2_INODES_PER_GROUP(sb)) {
|
| 421 |
|
|
if (__ext2_set_bit (j, bh->b_data)) {
|
| 422 |
|
|
ext2_warning (sb, "ext2_new_inode",
|
| 423 |
|
|
"bit already set for inode %d", j);
|
| 424 |
|
|
goto repeat;
|
| 425 |
|
|
}
|
| 426 |
|
|
mark_buffer_dirty(bh, 1);
|
| 427 |
|
|
if (sb->s_flags & MS_SYNCHRONOUS) {
|
| 428 |
|
|
ll_rw_block (WRITE, 1, &bh);
|
| 429 |
|
|
wait_on_buffer (bh);
|
| 430 |
|
|
}
|
| 431 |
|
|
} else {
|
| 432 |
|
|
if (swab16(gdp->bg_free_inodes_count) != 0) {
|
| 433 |
|
|
ext2_error (sb, "ext2_new_inode",
|
| 434 |
|
|
"Free inodes count corrupted in group %d",
|
| 435 |
|
|
i);
|
| 436 |
|
|
unlock_super (sb);
|
| 437 |
|
|
iput (inode);
|
| 438 |
|
|
return NULL;
|
| 439 |
|
|
}
|
| 440 |
|
|
goto repeat;
|
| 441 |
|
|
}
|
| 442 |
|
|
j += i * EXT2_INODES_PER_GROUP(sb) + 1;
|
| 443 |
|
|
if (j < EXT2_FIRST_INO(sb) || j > swab32(es->s_inodes_count)) {
|
| 444 |
|
|
ext2_error (sb, "ext2_new_inode",
|
| 445 |
|
|
"reserved inode or inode > inodes count - "
|
| 446 |
|
|
"block_group = %d,inode=%d", i, j);
|
| 447 |
|
|
unlock_super (sb);
|
| 448 |
|
|
iput (inode);
|
| 449 |
|
|
return NULL;
|
| 450 |
|
|
}
|
| 451 |
|
|
gdp->bg_free_inodes_count =
|
| 452 |
|
|
swab16(swab16(gdp->bg_free_inodes_count) - 1);
|
| 453 |
|
|
if (S_ISDIR(mode))
|
| 454 |
|
|
gdp->bg_used_dirs_count =
|
| 455 |
|
|
swab16(swab16(gdp->bg_used_dirs_count) + 1);
|
| 456 |
|
|
mark_buffer_dirty(bh2, 1);
|
| 457 |
|
|
es->s_free_inodes_count =
|
| 458 |
|
|
swab32(swab32(es->s_free_inodes_count) - 1);
|
| 459 |
|
|
mark_buffer_dirty(sb->u.ext2_sb.s_sbh, 1);
|
| 460 |
|
|
sb->s_dirt = 1;
|
| 461 |
|
|
inode->i_mode = mode;
|
| 462 |
|
|
inode->i_sb = sb;
|
| 463 |
|
|
inode->i_count = 1;
|
| 464 |
|
|
inode->i_nlink = 1;
|
| 465 |
|
|
inode->i_dev = sb->s_dev;
|
| 466 |
|
|
inode->i_uid = current->fsuid;
|
| 467 |
|
|
if (test_opt (sb, GRPID))
|
| 468 |
|
|
inode->i_gid = dir->i_gid;
|
| 469 |
|
|
else if (dir->i_mode & S_ISGID) {
|
| 470 |
|
|
inode->i_gid = dir->i_gid;
|
| 471 |
|
|
if (S_ISDIR(mode))
|
| 472 |
|
|
mode |= S_ISGID;
|
| 473 |
|
|
} else
|
| 474 |
|
|
inode->i_gid = current->fsgid;
|
| 475 |
|
|
inode->i_dirt = 1;
|
| 476 |
|
|
inode->i_ino = j;
|
| 477 |
|
|
inode->i_blksize = PAGE_SIZE; /* This is the optimal IO size (for stat), not the fs block size */
|
| 478 |
|
|
inode->i_blocks = 0;
|
| 479 |
|
|
inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
|
| 480 |
|
|
inode->u.ext2_i.i_new_inode = 1;
|
| 481 |
|
|
inode->u.ext2_i.i_flags = dir->u.ext2_i.i_flags;
|
| 482 |
|
|
if (S_ISLNK(mode))
|
| 483 |
|
|
inode->u.ext2_i.i_flags &= ~(EXT2_IMMUTABLE_FL | EXT2_APPEND_FL);
|
| 484 |
|
|
inode->u.ext2_i.i_faddr = 0;
|
| 485 |
|
|
inode->u.ext2_i.i_frag_no = 0;
|
| 486 |
|
|
inode->u.ext2_i.i_frag_size = 0;
|
| 487 |
|
|
inode->u.ext2_i.i_file_acl = 0;
|
| 488 |
|
|
inode->u.ext2_i.i_dir_acl = 0;
|
| 489 |
|
|
inode->u.ext2_i.i_dtime = 0;
|
| 490 |
|
|
inode->u.ext2_i.i_block_group = i;
|
| 491 |
|
|
inode->i_op = NULL;
|
| 492 |
|
|
if (inode->u.ext2_i.i_flags & EXT2_SYNC_FL)
|
| 493 |
|
|
inode->i_flags |= MS_SYNCHRONOUS;
|
| 494 |
|
|
insert_inode_hash(inode);
|
| 495 |
|
|
inc_inode_version (inode, gdp, mode);
|
| 496 |
|
|
|
| 497 |
|
|
unlock_super (sb);
|
| 498 |
|
|
if (sb->dq_op) {
|
| 499 |
|
|
sb->dq_op->initialize (inode, -1);
|
| 500 |
|
|
if (sb->dq_op->alloc_inode (inode, 1)) {
|
| 501 |
|
|
sb->dq_op->drop (inode);
|
| 502 |
|
|
inode->i_nlink = 0;
|
| 503 |
|
|
iput (inode);
|
| 504 |
|
|
*err = -EDQUOT;
|
| 505 |
|
|
return NULL;
|
| 506 |
|
|
}
|
| 507 |
|
|
inode->i_flags |= S_WRITE;
|
| 508 |
|
|
}
|
| 509 |
|
|
ext2_debug ("allocating inode %lu\n", inode->i_ino);
|
| 510 |
|
|
|
| 511 |
|
|
*err = 0;
|
| 512 |
|
|
return inode;
|
| 513 |
|
|
}
|
| 514 |
|
|
|
| 515 |
|
|
unsigned long ext2_count_free_inodes (struct super_block * sb)
|
| 516 |
|
|
{
|
| 517 |
|
|
#ifdef EXT2FS_DEBUG
|
| 518 |
|
|
struct ext2_super_block * es;
|
| 519 |
|
|
unsigned long desc_count, bitmap_count, x;
|
| 520 |
|
|
int bitmap_nr;
|
| 521 |
|
|
struct ext2_group_desc * gdp;
|
| 522 |
|
|
int i;
|
| 523 |
|
|
|
| 524 |
|
|
lock_super (sb);
|
| 525 |
|
|
es = sb->u.ext2_sb.s_es;
|
| 526 |
|
|
desc_count = 0;
|
| 527 |
|
|
bitmap_count = 0;
|
| 528 |
|
|
gdp = NULL;
|
| 529 |
|
|
for (i = 0; i < sb->u.ext2_sb.s_groups_count; i++) {
|
| 530 |
|
|
gdp = get_group_desc (sb, i, NULL);
|
| 531 |
|
|
desc_count += swab16(gdp->bg_free_inodes_count);
|
| 532 |
|
|
bitmap_nr = load_inode_bitmap (sb, i);
|
| 533 |
|
|
if (bitmap_nr < 0)
|
| 534 |
|
|
continue;
|
| 535 |
|
|
|
| 536 |
|
|
x = ext2_count_free (sb->u.ext2_sb.s_inode_bitmap[bitmap_nr],
|
| 537 |
|
|
EXT2_INODES_PER_GROUP(sb) / 8);
|
| 538 |
|
|
printk ("group %d: stored = %d, counted = %lu\n",
|
| 539 |
|
|
i, swab16(gdp->bg_free_inodes_count), x);
|
| 540 |
|
|
bitmap_count += x;
|
| 541 |
|
|
}
|
| 542 |
|
|
printk("ext2_count_free_inodes: stored = %lu, computed = %lu, %lu\n",
|
| 543 |
|
|
swab32(es->s_free_inodes_count), desc_count, bitmap_count);
|
| 544 |
|
|
unlock_super (sb);
|
| 545 |
|
|
return desc_count;
|
| 546 |
|
|
#else
|
| 547 |
|
|
return swab32(sb->u.ext2_sb.s_es->s_free_inodes_count);
|
| 548 |
|
|
#endif
|
| 549 |
|
|
}
|
| 550 |
|
|
|
| 551 |
|
|
void ext2_check_inodes_bitmap (struct super_block * sb)
|
| 552 |
|
|
{
|
| 553 |
|
|
struct ext2_super_block * es;
|
| 554 |
|
|
unsigned long desc_count, bitmap_count, x;
|
| 555 |
|
|
int bitmap_nr;
|
| 556 |
|
|
struct ext2_group_desc * gdp;
|
| 557 |
|
|
int i;
|
| 558 |
|
|
|
| 559 |
|
|
lock_super (sb);
|
| 560 |
|
|
es = sb->u.ext2_sb.s_es;
|
| 561 |
|
|
desc_count = 0;
|
| 562 |
|
|
bitmap_count = 0;
|
| 563 |
|
|
gdp = NULL;
|
| 564 |
|
|
for (i = 0; i < sb->u.ext2_sb.s_groups_count; i++) {
|
| 565 |
|
|
gdp = get_group_desc (sb, i, NULL);
|
| 566 |
|
|
desc_count += swab16(gdp->bg_free_inodes_count);
|
| 567 |
|
|
bitmap_nr = load_inode_bitmap (sb, i);
|
| 568 |
|
|
if (bitmap_nr < 0)
|
| 569 |
|
|
continue;
|
| 570 |
|
|
|
| 571 |
|
|
x = ext2_count_free (sb->u.ext2_sb.s_inode_bitmap[bitmap_nr],
|
| 572 |
|
|
EXT2_INODES_PER_GROUP(sb) / 8);
|
| 573 |
|
|
if (swab16(gdp->bg_free_inodes_count) != x)
|
| 574 |
|
|
ext2_error (sb, "ext2_check_inodes_bitmap",
|
| 575 |
|
|
"Wrong free inodes count in group %d, "
|
| 576 |
|
|
"stored = %d, counted = %lu", i,
|
| 577 |
|
|
swab16(gdp->bg_free_inodes_count), x);
|
| 578 |
|
|
bitmap_count += x;
|
| 579 |
|
|
}
|
| 580 |
|
|
if (swab32(es->s_free_inodes_count) != bitmap_count)
|
| 581 |
|
|
ext2_error (sb, "ext2_check_inodes_bitmap",
|
| 582 |
|
|
"Wrong free inodes count in super block, "
|
| 583 |
|
|
"stored = %lu, counted = %lu",
|
| 584 |
|
|
(unsigned long) swab32(es->s_free_inodes_count),
|
| 585 |
|
|
bitmap_count);
|
| 586 |
|
|
unlock_super (sb);
|
| 587 |
|
|
}
|
