korg/linux
0
0
Fork 0
mirror of https://mirrors.bfsu.edu.cn/git/linux.git synced 2024-11-29 23:24:11 +08:00
Code Issues Packages Projects Releases Wiki Activity

udf: Fix directory corruption after extent merging

Browse Source 
If udf_bread() called from udf_add_entry() managed to merge created extent to
an already existing one (or if previous extents could be merged), the code
truncating the last extent to proper size would just overwrite the freshly
allocated extent with an extent that used to be in that place.  This obviously
results in a directory corruption. Fix the problem by properly reloading the
last extent.

Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Jan Kara 2010-11-25 03:56:24 +01:00
parent 8754a3f718
commit 4651c5900e
1 changed files with 10 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
fs/udf/namei.c
View File

@ -471,15 +471,19 @@ add:
f_pos >> dir->i_sb->s_blocksize_bits, 1, err);
if (!fibh->ebh)
goto out_err;
/* Extents could have been merged, invalidate our position */
brelse(epos.bh);
epos.bh = NULL;
epos.block = dinfo->i_location;
epos.offset = udf_file_entry_alloc_offset(dir);
if (!fibh->soffset) {
if (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
(EXT_RECORDED_ALLOCATED >> 30)) {
block = eloc.logicalBlockNum + ((elen - 1) >>
/* Find the freshly allocated block */
while (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
(EXT_RECORDED_ALLOCATED >> 30))
;
block = eloc.logicalBlockNum + ((elen - 1) >>
dir->i_sb->s_blocksize_bits);
} else
block++;
brelse(fibh->sbh);
fibh->sbh = fibh->ebh;
fi = (struct fileIdentDesc *)(fibh->sbh->b_data);