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btrfs: extent_io: Handle errors better in extent_writepages()

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We can only get <=0 from extent_write_cache_pages, add an ASSERT() for
it just in case.

Then instead of submitting the write bio even if we got some error,
check the return value first.
If we have already hit some error, just clean up the corrupted or
half-baked bio, and return error.

If there is no error so far, then call flush_write_bio() and return the
result.

Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Qu Wenruo 2019-03-20 14:27:48 +08:00 committed by David Sterba
parent 2e3c25136a
commit a2a72fbd11
1 changed files with 6 additions and 3 deletions
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9
fs/btrfs/extent_io.c
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@ -4104,7 +4104,6 @@ int extent_writepages(struct address_space *mapping,
struct writeback_control *wbc)
{
int ret = 0;
int flush_ret;
struct extent_page_data epd = {
.bio = NULL,
.tree = &BTRFS_I(mapping->host)->io_tree,
@ -4113,8 +4112,12 @@ int extent_writepages(struct address_space *mapping,
};
ret = extent_write_cache_pages(mapping, wbc, &epd);
flush_ret = flush_write_bio(&epd);
BUG_ON(flush_ret < 0);
ASSERT(ret <= 0);
if (ret < 0) {
end_write_bio(&epd, ret);
return ret;
}
ret = flush_write_bio(&epd);
return ret;
}