Commit a86a72a4 authored by Ryan Ding's avatar Ryan Ding Committed by Linus Torvalds
Browse files

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: default avatarRyan Ding <ryan.ding@oracle.com>
Reviewed-by: default avatarJunxiao 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: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent e63890f3
......@@ -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:
......
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