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authorRyan Ding <ryan.ding@oracle.com>2016-03-25 14:21:18 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2016-03-25 16:37:42 -0700
commita86a72a4a4e0ec109a98e2737948864ed6794bf7 (patch)
tree8fcefc0392041d5406f8bf88300dd53fc23c82f8
parente63890f38ade9497b5609ddeb7f52df0fe55ea15 (diff)
downloadlinux-sh-a86a72a4a4e0ec109a98e2737948864ed6794bf7.tar.gz
ocfs2: take ip_alloc_sem in ocfs2_dio_get_block & ocfs2_dio_end_io_write
Take ip_alloc_sem to prevent concurrent access to extent tree, which may cause the extent tree in an unstable state. Signed-off-by: Ryan Ding <ryan.ding@oracle.com> Reviewed-by: Junxiao Bi <junxiao.bi@oracle.com> Cc: Joseph Qi <joseph.qi@huawei.com> Cc: Mark Fasheh <mfasheh@suse.de> Cc: Joel Becker <jlbec@evilplan.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--fs/ocfs2/aops.c23
1 files changed, 17 insertions, 6 deletions
diff --git a/fs/ocfs2/aops.c b/fs/ocfs2/aops.c
index 843475793504..0f3816325808 100644
--- a/fs/ocfs2/aops.c
+++ b/fs/ocfs2/aops.c
@@ -2151,6 +2151,7 @@ static int ocfs2_dio_get_block(struct inode *inode, sector_t iblock,
struct buffer_head *bh_result, int create)
{
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+ struct ocfs2_inode_info *oi = OCFS2_I(inode);
struct ocfs2_write_ctxt *wc;
struct ocfs2_write_cluster_desc *desc = NULL;
struct ocfs2_dio_write_ctxt *dwc = NULL;
@@ -2166,9 +2167,12 @@ static int ocfs2_dio_get_block(struct inode *inode, sector_t iblock,
mlog(0, "get block of %lu at %llu:%u req %u\n",
inode->i_ino, pos, len, total_len);
+ down_read(&oi->ip_alloc_sem);
/* This is the fast path for re-write. */
ret = ocfs2_get_block(inode, iblock, bh_result, create);
+ up_read(&oi->ip_alloc_sem);
+
if (buffer_mapped(bh_result) &&
!buffer_new(bh_result) &&
ret == 0)
@@ -2206,6 +2210,8 @@ static int ocfs2_dio_get_block(struct inode *inode, sector_t iblock,
goto out;
}
+ down_write(&oi->ip_alloc_sem);
+
if (first_get_block) {
if (ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb)))
ret = ocfs2_zero_tail(inode, di_bh, pos);
@@ -2259,6 +2265,7 @@ static int ocfs2_dio_get_block(struct inode *inode, sector_t iblock,
BUG_ON(ret != len);
ret = 0;
unlock:
+ up_write(&oi->ip_alloc_sem);
ocfs2_inode_unlock(inode, 1);
brelse(di_bh);
out:
@@ -2275,6 +2282,7 @@ static void ocfs2_dio_end_io_write(struct inode *inode,
struct ocfs2_cached_dealloc_ctxt dealloc;
struct ocfs2_extent_tree et;
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+ struct ocfs2_inode_info *oi = OCFS2_I(inode);
struct ocfs2_unwritten_extent *ue = NULL;
struct buffer_head *di_bh = NULL;
struct ocfs2_dinode *di;
@@ -2293,12 +2301,6 @@ static void ocfs2_dio_end_io_write(struct inode *inode,
!dwc->dw_orphaned)
goto out;
- ret = ocfs2_inode_lock(inode, &di_bh, 1);
- if (ret < 0) {
- mlog_errno(ret);
- goto out;
- }
-
/* ocfs2_file_write_iter will get i_mutex, so we need not lock if we
* are in that context. */
if (dwc->dw_writer_pid != task_pid_nr(current)) {
@@ -2306,6 +2308,14 @@ static void ocfs2_dio_end_io_write(struct inode *inode,
locked = 1;
}
+ ret = ocfs2_inode_lock(inode, &di_bh, 1);
+ if (ret < 0) {
+ mlog_errno(ret);
+ goto out;
+ }
+
+ down_write(&oi->ip_alloc_sem);
+
/* Delete orphan before acquire i_mutex. */
if (dwc->dw_orphaned) {
BUG_ON(dwc->dw_writer_pid != task_pid_nr(current));
@@ -2359,6 +2369,7 @@ static void ocfs2_dio_end_io_write(struct inode *inode,
commit:
ocfs2_commit_trans(osb, handle);
unlock:
+ up_write(&oi->ip_alloc_sem);
ocfs2_inode_unlock(inode, 1);
brelse(di_bh);
out: