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exofs: clean up the correct page collection on write error 

if ore_write() fails, we would unlock the pages of pcol, which is now
empty, rather than pcol_copy which owns the pages when ore_write() is
called. this means that no pages will actually be unlocked
(pcol.nr_pages == 0) and the writing process (more accurately, the
syncing process) will hang waiting for a writeback notification that
never comes.

moreover, if ore_write() fails, pcol_free() is called for pcol, whereas
pcol_copy is the object owning the ore_io_state, thus leaking the
ore_io_state.

[Boaz]
I have simplified Idan's original patch a bit, everything else still
holds

Signed-off-by: Idan Kedar <idank@tonian.com>
Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
This commit is contained in:
Idan Kedar 2012-11-30 16:03:31 +02:00 committed by Boaz Harrosh
parent b6755ffb0c
commit af402ab2b0
1 changed files with 4 additions and 2 deletions
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6
fs/exofs/inode.c
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@ -676,8 +676,10 @@ static int write_exec(struct page_collect *pcol)
return 0;
err:
_unlock_pcol_pages(pcol, ret, WRITE);
pcol_free(pcol);
if (!pcol_copy) /* Failed before ownership transfer */
pcol_copy = pcol;
_unlock_pcol_pages(pcol_copy, ret, WRITE);
pcol_free(pcol_copy);
kfree(pcol_copy);
return ret;