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| author | Junxiao Bi <junxiao.bi@oracle.com> | 2016-05-12 15:42:15 -0700 |
|---|---|---|
| committer | Sasha Levin <sasha.levin@oracle.com> | 2016-05-17 22:25:33 -0400 |
| commit | 7879a58a1c6c13501c79418b82053007ebf04f88 (patch) | |
| tree | 1a7611605586cf314b90053ec0ba431c891e259b /fs/ocfs2 | |
| parent | c0ce2224531ad6c19a62db19c0ec7575af1cfb10 (diff) | |
| download | linux-stable-7879a58a1c6c13501c79418b82053007ebf04f88.tar.gz linux-stable-7879a58a1c6c13501c79418b82053007ebf04f88.tar.bz2 linux-stable-7879a58a1c6c13501c79418b82053007ebf04f88.zip | |
ocfs2: revert using ocfs2_acl_chmod to avoid inode cluster lock hang
[ Upstream commit 5ee0fbd50fdf1c1329de8bee35ea9d7c6a81a2e0 ]
Commit 743b5f1434f5 ("ocfs2: take inode lock in ocfs2_iop_set/get_acl()")
introduced this issue. ocfs2_setattr called by chmod command holds
cluster wide inode lock when calling posix_acl_chmod. This latter
function in turn calls ocfs2_iop_get_acl and ocfs2_iop_set_acl. These
two are also called directly from vfs layer for getfacl/setfacl commands
and therefore acquire the cluster wide inode lock. If a remote
conversion request comes after the first inode lock in ocfs2_setattr,
OCFS2_LOCK_BLOCKED will be set. And this will cause the second call to
inode lock from the ocfs2_iop_get_acl() to block indefinetly.
The deleted version of ocfs2_acl_chmod() calls __posix_acl_chmod() which
does not call back into the filesystem. Therefore, we restore
ocfs2_acl_chmod(), modify it slightly for locking as needed, and use that
instead.
Fixes: 743b5f1434f5 ("ocfs2: take inode lock in ocfs2_iop_set/get_acl()")
Signed-off-by: Tariq Saeed <tariq.x.saeed@oracle.com>
Signed-off-by: Junxiao Bi <junxiao.bi@oracle.com>
Cc: Mark Fasheh <mfasheh@suse.de>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Joseph Qi <joseph.qi@huawei.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
Diffstat (limited to 'fs/ocfs2')
| -rw-r--r-- | fs/ocfs2/acl.c | 24 | ||||
| -rw-r--r-- | fs/ocfs2/acl.h | 1 | ||||
| -rw-r--r-- | fs/ocfs2/file.c | 4 |
3 files changed, 27 insertions, 2 deletions
diff --git a/fs/ocfs2/acl.c b/fs/ocfs2/acl.c index 7e8282dcea2a..642da8340825 100644 --- a/fs/ocfs2/acl.c +++ b/fs/ocfs2/acl.c @@ -310,3 +310,27 @@ struct posix_acl *ocfs2_iop_get_acl(struct inode *inode, int type) return acl; } + +int ocfs2_acl_chmod(struct inode *inode, struct buffer_head *bh) +{ + struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); + struct posix_acl *acl; + int ret; + + if (S_ISLNK(inode->i_mode)) + return -EOPNOTSUPP; + + if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL)) + return 0; + + acl = ocfs2_get_acl_nolock(inode, ACL_TYPE_ACCESS, bh); + if (IS_ERR(acl) || !acl) + return PTR_ERR(acl); + ret = __posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode); + if (ret) + return ret; + ret = ocfs2_set_acl(NULL, inode, NULL, ACL_TYPE_ACCESS, + acl, NULL, NULL); + posix_acl_release(acl); + return ret; +} diff --git a/fs/ocfs2/acl.h b/fs/ocfs2/acl.h index 3fce68d08625..035e5878db06 100644 --- a/fs/ocfs2/acl.h +++ b/fs/ocfs2/acl.h @@ -35,5 +35,6 @@ int ocfs2_set_acl(handle_t *handle, struct posix_acl *acl, struct ocfs2_alloc_context *meta_ac, struct ocfs2_alloc_context *data_ac); +extern int ocfs2_acl_chmod(struct inode *, struct buffer_head *); #endif /* OCFS2_ACL_H */ diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c index e6e8d6449b47..9d5adfd6b326 100644 --- a/fs/ocfs2/file.c +++ b/fs/ocfs2/file.c @@ -1249,18 +1249,18 @@ bail_unlock_rw: if (size_change) ocfs2_rw_unlock(inode, 1); bail: - brelse(bh); /* Release quota pointers in case we acquired them */ for (qtype = 0; qtype < OCFS2_MAXQUOTAS; qtype++) dqput(transfer_to[qtype]); if (!status && attr->ia_valid & ATTR_MODE) { - status = posix_acl_chmod(inode, inode->i_mode); + status = ocfs2_acl_chmod(inode, bh); if (status < 0) mlog_errno(status); } + brelse(bh); return status; } |