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fuse: writepages: roll back changes if request not found 

fuse_writepage_in_flight() returns false if it fails to find request with
given index in fi->writepages.  Then the caller proceeds with populating
data->orig_pages[] and incrementing req->num_pages.  Hence,
fuse_writepage_in_flight() must revert changes it made in request before
returning false.

Signed-off-by: Maxim Patlasov <MPatlasov@parallels.com>
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
This commit is contained in:
Maxim Patlasov 2013-10-02 15:01:07 +04:00 committed by Miklos Szeredi
parent cb2ffb26e6
commit f6011081f5
1 changed files with 4 additions and 2 deletions
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6
fs/fuse/file.c
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@ -1649,7 +1649,6 @@ static bool fuse_writepage_in_flight(struct fuse_req *new_req,
spin_lock(&fc->lock);
list_del(&new_req->writepages_entry);
new_req->num_pages = 1;
list_for_each_entry(old_req, &fi->writepages, writepages_entry) {
BUG_ON(old_req->inode != new_req->inode);
curr_index = old_req->misc.write.in.offset >> PAGE_CACHE_SHIFT;
@ -1659,9 +1658,12 @@ static bool fuse_writepage_in_flight(struct fuse_req *new_req,
break;
}
}
if (!found)
if (!found) {
list_add(&new_req->writepages_entry, &fi->writepages);
goto out_unlock;
}
new_req->num_pages = 1;
for (tmp = old_req; tmp != NULL; tmp = tmp->misc.write.next) {
BUG_ON(tmp->inode != new_req->inode);
curr_index = tmp->misc.write.in.offset >> PAGE_CACHE_SHIFT;