luck/tmp_suning_uos_patched
1
0
Fork 1
Code Issues Pull Requests Packages Projects Releases Wiki Activity

GFS2: Lock i_mutex and use a local gfs2_holder for fallocate

Browse Source 
This patch causes GFS2 to lock the i_mutex during fallocate. It
also switches from using a dinode's inode glock to using a local
holder like the other GFS2 i_operations.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
This commit is contained in:
Bob Peterson 2014-02-06 10:43:50 -05:00 committed by Steven Whitehouse
parent 774016b2d4
commit a0846a534c
1 changed files with 9 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
fs/gfs2/file.c
View File

@ -811,6 +811,8 @@ static long gfs2_fallocate(struct file *file, int mode, loff_t offset,
loff_t bsize_mask = ~((loff_t)sdp->sd_sb.sb_bsize - 1);
loff_t next = (offset + len - 1) >> sdp->sd_sb.sb_bsize_shift;
loff_t max_chunk_size = UINT_MAX & bsize_mask;
struct gfs2_holder gh;
next = (next + 1) << sdp->sd_sb.sb_bsize_shift;
/* We only support the FALLOC_FL_KEEP_SIZE mode */
@ -831,8 +833,10 @@ static long gfs2_fallocate(struct file *file, int mode, loff_t offset,
if (error)
return error;
gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &ip->i_gh);
error = gfs2_glock_nq(&ip->i_gh);
mutex_lock(&inode->i_mutex);
gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
error = gfs2_glock_nq(&gh);
if (unlikely(error))
goto out_uninit;
@ -900,9 +904,10 @@ static long gfs2_fallocate(struct file *file, int mode, loff_t offset,
out_qunlock:
gfs2_quota_unlock(ip);
out_unlock:
gfs2_glock_dq(&ip->i_gh);
gfs2_glock_dq(&gh);
out_uninit:
gfs2_holder_uninit(&ip->i_gh);
gfs2_holder_uninit(&gh);
mutex_unlock(&inode->i_mutex);
return error;
}