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| author | Miklos Szeredi <mszeredi@redhat.com> | 2020-07-14 14:45:41 +0200 |
|---|---|---|
| committer | Miklos Szeredi <mszeredi@redhat.com> | 2020-07-14 14:45:41 +0200 |
| commit | 69a6487ac0ea1bbc8d8b654cb5a4541f2d922f91 (patch) | |
| tree | c6a21a219d65de6f8a3569ed8ce6fbf62a1fda01 | |
| parent | b3a9e3b9622ae10064826dccb4f7a52bd88c7407 (diff) | |
| download | mvebu-69a6487ac0ea1bbc8d8b654cb5a4541f2d922f91.tar.gz | |
fuse: move rb_erase() before tree_insert()
In fuse_writepage_end() the old writepages entry needs to be removed from
the rbtree before inserting the new one, otherwise tree_insert() would
fail. This is a very rare codepath and no reproducer exists.
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
| -rw-r--r-- | fs/fuse/file.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/fuse/file.c b/fs/fuse/file.c index e573b0cd2737dc..7247c02adb32ae 100644 --- a/fs/fuse/file.c +++ b/fs/fuse/file.c @@ -1586,7 +1586,6 @@ static void fuse_writepage_finish(struct fuse_conn *fc, struct backing_dev_info *bdi = inode_to_bdi(inode); int i; - rb_erase(&wpa->writepages_entry, &fi->writepages); for (i = 0; i < ap->num_pages; i++) { dec_wb_stat(&bdi->wb, WB_WRITEBACK); dec_node_page_state(ap->pages[i], NR_WRITEBACK_TEMP); @@ -1637,6 +1636,7 @@ __acquires(fi->lock) out_free: fi->writectr--; + rb_erase(&wpa->writepages_entry, &fi->writepages); fuse_writepage_finish(fc, wpa); spin_unlock(&fi->lock); @@ -1714,6 +1714,7 @@ static void fuse_writepage_end(struct fuse_conn *fc, struct fuse_args *args, mapping_set_error(inode->i_mapping, error); spin_lock(&fi->lock); + rb_erase(&wpa->writepages_entry, &fi->writepages); while (wpa->next) { struct fuse_conn *fc = get_fuse_conn(inode); struct fuse_write_in *inarg = &wpa->ia.write.in; |