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| author | Ryan Ding <ryan.ding@oracle.com> | 2016-03-26 00:21:18 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-03-26 02:37:42 +0300 |
| commit | a86a72a4a4e0ec109a98e2737948864ed6794bf7 (patch) | |
| tree | 8fcefc0392041d5406f8bf88300dd53fc23c82f8 /fs/ocfs2/aops.c | |
| parent | e63890f38ade9497b5609ddeb7f52df0fe55ea15 (diff) | |
| download | linux-a86a72a4a4e0ec109a98e2737948864ed6794bf7.tar.xz | |
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>
Diffstat (limited to 'fs/ocfs2/aops.c')
| -rw-r--r-- | fs/ocfs2/aops.c | 23 |
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: |