diff options
Diffstat (limited to 'fs/ext4/super.c')
| -rw-r--r-- | fs/ext4/super.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/fs/ext4/super.c b/fs/ext4/super.c index 53ff6c2a26ed..361624460431 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -140,6 +140,29 @@ MODULE_ALIAS_FS("ext3"); MODULE_ALIAS("ext3"); #define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type) +/* + * This works like sb_bread() except it uses ERR_PTR for error + * returns. Currently with sb_bread it's impossible to distinguish + * between ENOMEM and EIO situations (since both result in a NULL + * return. + */ +struct buffer_head * +ext4_sb_bread(struct super_block *sb, sector_t block, int op_flags) +{ + struct buffer_head *bh = sb_getblk(sb, block); + + if (bh == NULL) + return ERR_PTR(-ENOMEM); + if (buffer_uptodate(bh)) + return bh; + ll_rw_block(REQ_OP_READ, REQ_META | op_flags, 1, &bh); + wait_on_buffer(bh); + if (buffer_uptodate(bh)) + return bh; + put_bh(bh); + return ERR_PTR(-EIO); +} + static int ext4_verify_csum_type(struct super_block *sb, struct ext4_super_block *es) { |