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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [fs/] [minix/] [inode.c] - Rev 1275
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/* * linux/fs/minix/inode.c * * Copyright (C) 1991, 1992 Linus Torvalds * * Copyright (C) 1996 Gertjan van Wingerde (gertjan@cs.vu.nl) * Minix V2 fs support. * * Modified for 680x0 by Andreas Schwab */ #include <linux/module.h> #include <linux/fs.h> #include <linux/minix_fs.h> #include <linux/slab.h> #include <linux/locks.h> #include <linux/init.h> #include <linux/smp_lock.h> #include <linux/highuid.h> #include <linux/blkdev.h> static void minix_read_inode(struct inode * inode); static void minix_write_inode(struct inode * inode, int wait); static int minix_statfs(struct super_block *sb, struct statfs *buf); static int minix_remount (struct super_block * sb, int * flags, char * data); static void minix_delete_inode(struct inode *inode) { lock_kernel(); inode->i_size = 0; minix_truncate(inode); minix_free_inode(inode); unlock_kernel(); } static void minix_commit_super(struct super_block * sb) { mark_buffer_dirty(sb->u.minix_sb.s_sbh); sb->s_dirt = 0; } static void minix_write_super(struct super_block * sb) { struct minix_super_block * ms; if (!(sb->s_flags & MS_RDONLY)) { ms = sb->u.minix_sb.s_ms; if (ms->s_state & MINIX_VALID_FS) ms->s_state &= ~MINIX_VALID_FS; minix_commit_super(sb); } sb->s_dirt = 0; } static void minix_put_super(struct super_block *sb) { int i; if (!(sb->s_flags & MS_RDONLY)) { sb->u.minix_sb.s_ms->s_state = sb->u.minix_sb.s_mount_state; mark_buffer_dirty(sb->u.minix_sb.s_sbh); } for (i = 0; i < sb->u.minix_sb.s_imap_blocks; i++) brelse(sb->u.minix_sb.s_imap[i]); for (i = 0; i < sb->u.minix_sb.s_zmap_blocks; i++) brelse(sb->u.minix_sb.s_zmap[i]); brelse (sb->u.minix_sb.s_sbh); kfree(sb->u.minix_sb.s_imap); return; } static struct super_operations minix_sops = { read_inode: minix_read_inode, write_inode: minix_write_inode, delete_inode: minix_delete_inode, put_super: minix_put_super, write_super: minix_write_super, statfs: minix_statfs, remount_fs: minix_remount, }; static int minix_remount (struct super_block * sb, int * flags, char * data) { struct minix_super_block * ms; ms = sb->u.minix_sb.s_ms; if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) return 0; if (*flags & MS_RDONLY) { if (ms->s_state & MINIX_VALID_FS || !(sb->u.minix_sb.s_mount_state & MINIX_VALID_FS)) return 0; /* Mounting a rw partition read-only. */ ms->s_state = sb->u.minix_sb.s_mount_state; mark_buffer_dirty(sb->u.minix_sb.s_sbh); sb->s_dirt = 1; minix_commit_super(sb); } else { /* Mount a partition which is read-only, read-write. */ sb->u.minix_sb.s_mount_state = ms->s_state; ms->s_state &= ~MINIX_VALID_FS; mark_buffer_dirty(sb->u.minix_sb.s_sbh); sb->s_dirt = 1; if (!(sb->u.minix_sb.s_mount_state & MINIX_VALID_FS)) printk ("MINIX-fs warning: remounting unchecked fs, " "running fsck is recommended.\n"); else if ((sb->u.minix_sb.s_mount_state & MINIX_ERROR_FS)) printk ("MINIX-fs warning: remounting fs with errors, " "running fsck is recommended.\n"); } return 0; } static struct super_block *minix_read_super(struct super_block *s, void *data, int silent) { struct buffer_head *bh; struct buffer_head **map; struct minix_super_block *ms; int i, block; kdev_t dev = s->s_dev; struct inode *root_inode; unsigned int hblock; struct minix_sb_info *sbi = &s->u.minix_sb; /* N.B. These should be compile-time tests. Unfortunately that is impossible. */ if (32 != sizeof (struct minix_inode)) panic("bad V1 i-node size"); if (64 != sizeof(struct minix2_inode)) panic("bad V2 i-node size"); hblock = get_hardsect_size(dev); if (hblock > BLOCK_SIZE) goto out_bad_hblock; set_blocksize(dev, BLOCK_SIZE); s->s_blocksize = BLOCK_SIZE; s->s_blocksize_bits = BLOCK_SIZE_BITS; if (!(bh = sb_bread(s, 1))) goto out_bad_sb; ms = (struct minix_super_block *) bh->b_data; sbi->s_ms = ms; sbi->s_sbh = bh; sbi->s_mount_state = ms->s_state; sbi->s_ninodes = ms->s_ninodes; sbi->s_nzones = ms->s_nzones; sbi->s_imap_blocks = ms->s_imap_blocks; sbi->s_zmap_blocks = ms->s_zmap_blocks; sbi->s_firstdatazone = ms->s_firstdatazone; sbi->s_log_zone_size = ms->s_log_zone_size; sbi->s_max_size = ms->s_max_size; s->s_magic = ms->s_magic; if (s->s_magic == MINIX_SUPER_MAGIC) { sbi->s_version = MINIX_V1; sbi->s_dirsize = 16; sbi->s_namelen = 14; sbi->s_link_max = MINIX_LINK_MAX; } else if (s->s_magic == MINIX_SUPER_MAGIC2) { sbi->s_version = MINIX_V1; sbi->s_dirsize = 32; sbi->s_namelen = 30; sbi->s_link_max = MINIX_LINK_MAX; } else if (s->s_magic == MINIX2_SUPER_MAGIC) { sbi->s_version = MINIX_V2; sbi->s_nzones = ms->s_zones; sbi->s_dirsize = 16; sbi->s_namelen = 14; sbi->s_link_max = MINIX2_LINK_MAX; } else if (s->s_magic == MINIX2_SUPER_MAGIC2) { sbi->s_version = MINIX_V2; sbi->s_nzones = ms->s_zones; sbi->s_dirsize = 32; sbi->s_namelen = 30; sbi->s_link_max = MINIX2_LINK_MAX; } else goto out_no_fs; /* * Allocate the buffer map to keep the superblock small. */ i = (sbi->s_imap_blocks + sbi->s_zmap_blocks) * sizeof(bh); map = kmalloc(i, GFP_KERNEL); if (!map) goto out_no_map; memset(map, 0, i); sbi->s_imap = &map[0]; sbi->s_zmap = &map[sbi->s_imap_blocks]; block=2; for (i=0 ; i < sbi->s_imap_blocks ; i++) { if (!(sbi->s_imap[i]=sb_bread(s, block))) goto out_no_bitmap; block++; } for (i=0 ; i < sbi->s_zmap_blocks ; i++) { if (!(sbi->s_zmap[i]=sb_bread(s, block))) goto out_no_bitmap; block++; } minix_set_bit(0,sbi->s_imap[0]->b_data); minix_set_bit(0,sbi->s_zmap[0]->b_data); /* set up enough so that it can read an inode */ s->s_op = &minix_sops; root_inode = iget(s, MINIX_ROOT_INO); if (!root_inode || is_bad_inode(root_inode)) goto out_no_root; s->s_root = d_alloc_root(root_inode); if (!s->s_root) goto out_iput; if (!NO_TRUNCATE) s->s_root->d_op = &minix_dentry_operations; if (!(s->s_flags & MS_RDONLY)) { ms->s_state &= ~MINIX_VALID_FS; mark_buffer_dirty(bh); s->s_dirt = 1; } if (!(sbi->s_mount_state & MINIX_VALID_FS)) printk ("MINIX-fs: mounting unchecked file system, " "running fsck is recommended.\n"); else if (sbi->s_mount_state & MINIX_ERROR_FS) printk ("MINIX-fs: mounting file system with errors, " "running fsck is recommended.\n"); return s; out_iput: iput(root_inode); goto out_freemap; out_no_root: if (!silent) printk("MINIX-fs: get root inode failed\n"); goto out_freemap; out_no_bitmap: printk("MINIX-fs: bad superblock or unable to read bitmaps\n"); out_freemap: for (i = 0; i < sbi->s_imap_blocks; i++) brelse(sbi->s_imap[i]); for (i = 0; i < sbi->s_zmap_blocks; i++) brelse(sbi->s_zmap[i]); kfree(sbi->s_imap); goto out_release; out_no_map: if (!silent) printk ("MINIX-fs: can't allocate map\n"); goto out_release; out_no_fs: if (!silent) printk("VFS: Can't find a Minix or Minix V2 filesystem on device " "%s.\n", kdevname(dev)); out_release: brelse(bh); goto out; out_bad_hblock: printk("MINIX-fs: blocksize too small for device.\n"); goto out; out_bad_sb: printk("MINIX-fs: unable to read superblock\n"); out: return NULL; } static int minix_statfs(struct super_block *sb, struct statfs *buf) { buf->f_type = sb->s_magic; buf->f_bsize = sb->s_blocksize; buf->f_blocks = (sb->u.minix_sb.s_nzones - sb->u.minix_sb.s_firstdatazone) << sb->u.minix_sb.s_log_zone_size; buf->f_bfree = minix_count_free_blocks(sb); buf->f_bavail = buf->f_bfree; buf->f_files = sb->u.minix_sb.s_ninodes; buf->f_ffree = minix_count_free_inodes(sb); buf->f_namelen = sb->u.minix_sb.s_namelen; return 0; } static int minix_get_block(struct inode *inode, long block, struct buffer_head *bh_result, int create) { if (INODE_VERSION(inode) == MINIX_V1) return V1_minix_get_block(inode, block, bh_result, create); else return V2_minix_get_block(inode, block, bh_result, create); } static int minix_writepage(struct page *page) { return block_write_full_page(page,minix_get_block); } static int minix_readpage(struct file *file, struct page *page) { return block_read_full_page(page,minix_get_block); } static int minix_prepare_write(struct file *file, struct page *page, unsigned from, unsigned to) { return block_prepare_write(page,from,to,minix_get_block); } static int minix_bmap(struct address_space *mapping, long block) { return generic_block_bmap(mapping,block,minix_get_block); } static struct address_space_operations minix_aops = { readpage: minix_readpage, writepage: minix_writepage, sync_page: block_sync_page, prepare_write: minix_prepare_write, commit_write: generic_commit_write, bmap: minix_bmap }; void minix_set_inode(struct inode *inode, dev_t rdev) { if (S_ISREG(inode->i_mode)) { inode->i_op = &minix_file_inode_operations; inode->i_fop = &minix_file_operations; inode->i_mapping->a_ops = &minix_aops; } else if (S_ISDIR(inode->i_mode)) { inode->i_op = &minix_dir_inode_operations; inode->i_fop = &minix_dir_operations; inode->i_mapping->a_ops = &minix_aops; } else if (S_ISLNK(inode->i_mode)) { inode->i_op = &page_symlink_inode_operations; inode->i_mapping->a_ops = &minix_aops; } else init_special_inode(inode, inode->i_mode, rdev); } /* * The minix V1 function to read an inode. */ static void V1_minix_read_inode(struct inode * inode) { struct buffer_head * bh; struct minix_inode * raw_inode; int i; raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh); if (!raw_inode) { make_bad_inode(inode); return; } inode->i_mode = raw_inode->i_mode; inode->i_uid = (uid_t)raw_inode->i_uid; inode->i_gid = (gid_t)raw_inode->i_gid; inode->i_nlink = raw_inode->i_nlinks; inode->i_size = raw_inode->i_size; inode->i_mtime = inode->i_atime = inode->i_ctime = raw_inode->i_time; inode->i_blocks = inode->i_blksize = 0; for (i = 0; i < 9; i++) inode->u.minix_i.u.i1_data[i] = raw_inode->i_zone[i]; minix_set_inode(inode, raw_inode->i_zone[0]); brelse(bh); } /* * The minix V2 function to read an inode. */ static void V2_minix_read_inode(struct inode * inode) { struct buffer_head * bh; struct minix2_inode * raw_inode; int i; raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh); if (!raw_inode) { make_bad_inode(inode); return; } inode->i_mode = raw_inode->i_mode; inode->i_uid = (uid_t)raw_inode->i_uid; inode->i_gid = (gid_t)raw_inode->i_gid; inode->i_nlink = raw_inode->i_nlinks; inode->i_size = raw_inode->i_size; inode->i_mtime = raw_inode->i_mtime; inode->i_atime = raw_inode->i_atime; inode->i_ctime = raw_inode->i_ctime; inode->i_blocks = inode->i_blksize = 0; for (i = 0; i < 10; i++) inode->u.minix_i.u.i2_data[i] = raw_inode->i_zone[i]; minix_set_inode(inode, raw_inode->i_zone[0]); brelse(bh); } /* * The global function to read an inode. */ static void minix_read_inode(struct inode * inode) { if (INODE_VERSION(inode) == MINIX_V1) V1_minix_read_inode(inode); else V2_minix_read_inode(inode); } /* * The minix V1 function to synchronize an inode. */ static struct buffer_head * V1_minix_update_inode(struct inode * inode) { struct buffer_head * bh; struct minix_inode * raw_inode; int i; raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh); if (!raw_inode) return 0; raw_inode->i_mode = inode->i_mode; raw_inode->i_uid = fs_high2lowuid(inode->i_uid); raw_inode->i_gid = fs_high2lowgid(inode->i_gid); raw_inode->i_nlinks = inode->i_nlink; raw_inode->i_size = inode->i_size; raw_inode->i_time = inode->i_mtime; if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) raw_inode->i_zone[0] = kdev_t_to_nr(inode->i_rdev); else for (i = 0; i < 9; i++) raw_inode->i_zone[i] = inode->u.minix_i.u.i1_data[i]; mark_buffer_dirty(bh); return bh; } /* * The minix V2 function to synchronize an inode. */ static struct buffer_head * V2_minix_update_inode(struct inode * inode) { struct buffer_head * bh; struct minix2_inode * raw_inode; int i; raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh); if (!raw_inode) return 0; raw_inode->i_mode = inode->i_mode; raw_inode->i_uid = fs_high2lowuid(inode->i_uid); raw_inode->i_gid = fs_high2lowgid(inode->i_gid); raw_inode->i_nlinks = inode->i_nlink; raw_inode->i_size = inode->i_size; raw_inode->i_mtime = inode->i_mtime; raw_inode->i_atime = inode->i_atime; raw_inode->i_ctime = inode->i_ctime; if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) raw_inode->i_zone[0] = kdev_t_to_nr(inode->i_rdev); else for (i = 0; i < 10; i++) raw_inode->i_zone[i] = inode->u.minix_i.u.i2_data[i]; mark_buffer_dirty(bh); return bh; } static struct buffer_head *minix_update_inode(struct inode *inode) { if (INODE_VERSION(inode) == MINIX_V1) return V1_minix_update_inode(inode); else return V2_minix_update_inode(inode); } static void minix_write_inode(struct inode * inode, int wait) { struct buffer_head *bh; lock_kernel(); bh = minix_update_inode(inode); unlock_kernel(); brelse(bh); } int minix_sync_inode(struct inode * inode) { int err = 0; struct buffer_head *bh; bh = minix_update_inode(inode); if (bh && buffer_dirty(bh)) { ll_rw_block(WRITE, 1, &bh); wait_on_buffer(bh); if (buffer_req(bh) && !buffer_uptodate(bh)) { printk ("IO error syncing minix inode [" "%s:%08lx]\n", kdevname(inode->i_dev), inode->i_ino); err = -1; } } else if (!bh) err = -1; brelse (bh); return err; } /* * The function that is called for file truncation. */ void minix_truncate(struct inode * inode) { if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode))) return; if (INODE_VERSION(inode) == MINIX_V1) V1_minix_truncate(inode); else V2_minix_truncate(inode); } static DECLARE_FSTYPE_DEV(minix_fs_type,"minix",minix_read_super); static int __init init_minix_fs(void) { return register_filesystem(&minix_fs_type); } static void __exit exit_minix_fs(void) { unregister_filesystem(&minix_fs_type); } EXPORT_NO_SYMBOLS; module_init(init_minix_fs) module_exit(exit_minix_fs) MODULE_LICENSE("GPL");
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