diff options
Diffstat (limited to 'fs/bfs')
-rw-r--r-- | fs/bfs/bfs.h | 1 | ||||
-rw-r--r-- | fs/bfs/file.c | 17 | ||||
-rw-r--r-- | fs/bfs/inode.c | 116 |
3 files changed, 50 insertions, 84 deletions
diff --git a/fs/bfs/bfs.h b/fs/bfs/bfs.h index 7109e45..f7f87e2 100644 --- a/fs/bfs/bfs.h +++ b/fs/bfs/bfs.h @@ -17,7 +17,6 @@ struct bfs_sb_info { unsigned long si_lf_eblk; unsigned long si_lasti; unsigned long *si_imap; - struct buffer_head *si_sbh; /* buffer header w/superblock */ struct mutex bfs_lock; }; diff --git a/fs/bfs/file.c b/fs/bfs/file.c index 88b9a3f..eb67edd 100644 --- a/fs/bfs/file.c +++ b/fs/bfs/file.c @@ -70,7 +70,6 @@ static int bfs_get_block(struct inode *inode, sector_t block, struct super_block *sb = inode->i_sb; struct bfs_sb_info *info = BFS_SB(sb); struct bfs_inode_info *bi = BFS_I(inode); - struct buffer_head *sbh = info->si_sbh; phys = bi->i_sblock + block; if (!create) { @@ -112,7 +111,6 @@ static int bfs_get_block(struct inode *inode, sector_t block, info->si_freeb -= phys - bi->i_eblock; info->si_lf_eblk = bi->i_eblock = phys; mark_inode_dirty(inode); - mark_buffer_dirty(sbh); err = 0; goto out; } @@ -147,7 +145,6 @@ static int bfs_get_block(struct inode *inode, sector_t block, */ info->si_freeb -= bi->i_eblock - bi->i_sblock + 1 - inode->i_blocks; mark_inode_dirty(inode); - mark_buffer_dirty(sbh); map_bh(bh_result, sb, phys); out: mutex_unlock(&info->bfs_lock); @@ -168,9 +165,17 @@ static int bfs_write_begin(struct file *file, struct address_space *mapping, loff_t pos, unsigned len, unsigned flags, struct page **pagep, void **fsdata) { - *pagep = NULL; - return block_write_begin(file, mapping, pos, len, flags, - pagep, fsdata, bfs_get_block); + int ret; + + ret = block_write_begin(mapping, pos, len, flags, pagep, + bfs_get_block); + if (unlikely(ret)) { + loff_t isize = mapping->host->i_size; + if (pos + len > isize) + vmtruncate(mapping->host, isize); + } + + return ret; } static sector_t bfs_bmap(struct address_space *mapping, sector_t block) diff --git a/fs/bfs/inode.c b/fs/bfs/inode.c index f22a7d3..c4daf0f 100644 --- a/fs/bfs/inode.c +++ b/fs/bfs/inode.c @@ -31,7 +31,6 @@ MODULE_LICENSE("GPL"); #define dprintf(x...) #endif -static void bfs_write_super(struct super_block *s); void dump_imap(const char *prefix, struct super_block *s); struct inode *bfs_iget(struct super_block *sb, unsigned long ino) @@ -99,6 +98,24 @@ error: return ERR_PTR(-EIO); } +static struct bfs_inode *find_inode(struct super_block *sb, u16 ino, struct buffer_head **p) +{ + if ((ino < BFS_ROOT_INO) || (ino > BFS_SB(sb)->si_lasti)) { + printf("Bad inode number %s:%08x\n", sb->s_id, ino); + return ERR_PTR(-EIO); + } + + ino -= BFS_ROOT_INO; + + *p = sb_bread(sb, 1 + ino / BFS_INODES_PER_BLOCK); + if (!*p) { + printf("Unable to read inode %s:%08x\n", sb->s_id, ino); + return ERR_PTR(-EIO); + } + + return (struct bfs_inode *)(*p)->b_data + ino % BFS_INODES_PER_BLOCK; +} + static int bfs_write_inode(struct inode *inode, struct writeback_control *wbc) { struct bfs_sb_info *info = BFS_SB(inode->i_sb); @@ -106,28 +123,15 @@ static int bfs_write_inode(struct inode *inode, struct writeback_control *wbc) unsigned long i_sblock; struct bfs_inode *di; struct buffer_head *bh; - int block, off; int err = 0; dprintf("ino=%08x\n", ino); - if ((ino < BFS_ROOT_INO) || (ino > BFS_SB(inode->i_sb)->si_lasti)) { - printf("Bad inode number %s:%08x\n", inode->i_sb->s_id, ino); - return -EIO; - } + di = find_inode(inode->i_sb, ino, &bh); + if (IS_ERR(di)) + return PTR_ERR(di); mutex_lock(&info->bfs_lock); - block = (ino - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1; - bh = sb_bread(inode->i_sb, block); - if (!bh) { - printf("Unable to read inode %s:%08x\n", - inode->i_sb->s_id, ino); - mutex_unlock(&info->bfs_lock); - return -EIO; - } - - off = (ino - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK; - di = (struct bfs_inode *)bh->b_data + off; if (ino == BFS_ROOT_INO) di->i_vtype = cpu_to_le32(BFS_VDIR); @@ -158,12 +162,11 @@ static int bfs_write_inode(struct inode *inode, struct writeback_control *wbc) return err; } -static void bfs_delete_inode(struct inode *inode) +static void bfs_evict_inode(struct inode *inode) { unsigned long ino = inode->i_ino; struct bfs_inode *di; struct buffer_head *bh; - int block, off; struct super_block *s = inode->i_sb; struct bfs_sb_info *info = BFS_SB(s); struct bfs_inode_info *bi = BFS_I(inode); @@ -171,28 +174,19 @@ static void bfs_delete_inode(struct inode *inode) dprintf("ino=%08lx\n", ino); truncate_inode_pages(&inode->i_data, 0); + invalidate_inode_buffers(inode); + end_writeback(inode); - if ((ino < BFS_ROOT_INO) || (ino > info->si_lasti)) { - printf("invalid ino=%08lx\n", ino); + if (inode->i_nlink) return; - } - - inode->i_size = 0; - inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC; - mutex_lock(&info->bfs_lock); - mark_inode_dirty(inode); - block = (ino - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1; - bh = sb_bread(s, block); - if (!bh) { - printf("Unable to read inode %s:%08lx\n", - inode->i_sb->s_id, ino); - mutex_unlock(&info->bfs_lock); + di = find_inode(s, inode->i_ino, &bh); + if (IS_ERR(di)) return; - } - off = (ino - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK; - di = (struct bfs_inode *)bh->b_data + off; - memset((void *)di, 0, sizeof(struct bfs_inode)); + + mutex_lock(&info->bfs_lock); + /* clear on-disk inode */ + memset(di, 0, sizeof(struct bfs_inode)); mark_buffer_dirty(bh); brelse(bh); @@ -209,32 +203,9 @@ static void bfs_delete_inode(struct inode *inode) * "last block of the last file" even if there is no * real file there, saves us 1 gap. */ - if (info->si_lf_eblk == bi->i_eblock) { + if (info->si_lf_eblk == bi->i_eblock) info->si_lf_eblk = bi->i_sblock - 1; - mark_buffer_dirty(info->si_sbh); - } mutex_unlock(&info->bfs_lock); - clear_inode(inode); -} - -static int bfs_sync_fs(struct super_block *sb, int wait) -{ - struct bfs_sb_info *info = BFS_SB(sb); - - mutex_lock(&info->bfs_lock); - mark_buffer_dirty(info->si_sbh); - sb->s_dirt = 0; - mutex_unlock(&info->bfs_lock); - - return 0; -} - -static void bfs_write_super(struct super_block *sb) -{ - if (!(sb->s_flags & MS_RDONLY)) - bfs_sync_fs(sb, 1); - else - sb->s_dirt = 0; } static void bfs_put_super(struct super_block *s) @@ -246,10 +217,6 @@ static void bfs_put_super(struct super_block *s) lock_kernel(); - if (s->s_dirt) - bfs_write_super(s); - - brelse(info->si_sbh); mutex_destroy(&info->bfs_lock); kfree(info->si_imap); kfree(info); @@ -319,10 +286,8 @@ static const struct super_operations bfs_sops = { .alloc_inode = bfs_alloc_inode, .destroy_inode = bfs_destroy_inode, .write_inode = bfs_write_inode, - .delete_inode = bfs_delete_inode, + .evict_inode = bfs_evict_inode, .put_super = bfs_put_super, - .write_super = bfs_write_super, - .sync_fs = bfs_sync_fs, .statfs = bfs_statfs, }; @@ -349,7 +314,7 @@ void dump_imap(const char *prefix, struct super_block *s) static int bfs_fill_super(struct super_block *s, void *data, int silent) { - struct buffer_head *bh; + struct buffer_head *bh, *sbh; struct bfs_super_block *bfs_sb; struct inode *inode; unsigned i, imap_len; @@ -365,10 +330,10 @@ static int bfs_fill_super(struct super_block *s, void *data, int silent) sb_set_blocksize(s, BFS_BSIZE); - info->si_sbh = sb_bread(s, 0); - if (!info->si_sbh) + sbh = sb_bread(s, 0); + if (!sbh) goto out; - bfs_sb = (struct bfs_super_block *)info->si_sbh->b_data; + bfs_sb = (struct bfs_super_block *)sbh->b_data; if (le32_to_cpu(bfs_sb->s_magic) != BFS_MAGIC) { if (!silent) printf("No BFS filesystem on %s (magic=%08x)\n", @@ -472,10 +437,7 @@ static int bfs_fill_super(struct super_block *s, void *data, int silent) info->si_lf_eblk = eblock; } brelse(bh); - if (!(s->s_flags & MS_RDONLY)) { - mark_buffer_dirty(info->si_sbh); - s->s_dirt = 1; - } + brelse(sbh); dump_imap("read_super", s); return 0; @@ -485,7 +447,7 @@ out3: out2: kfree(info->si_imap); out1: - brelse(info->si_sbh); + brelse(sbh); out: mutex_destroy(&info->bfs_lock); kfree(info); |