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btrfs: extent_io: Move the BUG_ON() in flush_write_bio() one level up

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We have a BUG_ON() in flush_write_bio() to handle the return value of
submit_one_bio().

Move the BUG_ON() one level up to all its callers.

This patch will introduce temporary variable, @flush_ret to keep code
change minimal in this patch. That variable will be cleaned up when
enhancing the error handling later.

Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
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 14:27:41 +08:00 committed by David Sterba
parent 63489055e4
commit f4340622e0
1 changed files with 41 additions and 14 deletions
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55
fs/btrfs/extent_io.c
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@ -170,15 +170,28 @@ static int __must_check submit_one_bio(struct bio *bio, int mirror_num,
return blk_status_to_errno(ret);
}
static void flush_write_bio(struct extent_page_data *epd)
/*
* Submit bio from extent page data via submit_one_bio
*
* Return 0 if everything is OK.
* Return <0 for error.
*/
static int __must_check flush_write_bio(struct extent_page_data *epd)
{
if (epd->bio) {
int ret;
int ret = 0;
if (epd->bio) {
ret = submit_one_bio(epd->bio, 0, 0);
BUG_ON(ret < 0); /* -ENOMEM */
/*
* Clean up of epd->bio is handled by its endio function.
* And endio is either triggered by successful bio execution
* or the error handler of submit bio hook.
* So at this point, no matter what happened, we don't need
* to clean up epd->bio.
*/
epd->bio = NULL;
}
return ret;
}
int __init extent_io_init(void)
@ -3476,7 +3489,8 @@ lock_extent_buffer_for_io(struct extent_buffer *eb,
if (!btrfs_try_tree_write_lock(eb)) {
flush = 1;
flush_write_bio(epd);
ret = flush_write_bio(epd);
BUG_ON(ret < 0);
btrfs_tree_lock(eb);
}
@ -3485,7 +3499,8 @@ lock_extent_buffer_for_io(struct extent_buffer *eb,
if (!epd->sync_io)
return 0;
if (!flush) {
flush_write_bio(epd);
ret = flush_write_bio(epd);
BUG_ON(ret < 0);
flush = 1;
}
while (1) {
@ -3526,7 +3541,8 @@ lock_extent_buffer_for_io(struct extent_buffer *eb,
if (!trylock_page(p)) {
if (!flush) {
flush_write_bio(epd);
ret = flush_write_bio(epd);
BUG_ON(ret < 0);
flush = 1;
}
lock_page(p);
@ -3718,6 +3734,7 @@ int btree_write_cache_pages(struct address_space *mapping,
.sync_io = wbc->sync_mode == WB_SYNC_ALL,
};
int ret = 0;
int flush_ret;
int done = 0;
int nr_to_write_done = 0;
struct pagevec pvec;
@ -3817,7 +3834,8 @@ int btree_write_cache_pages(struct address_space *mapping,
index = 0;
goto retry;
}
flush_write_bio(&epd);
flush_ret = flush_write_bio(&epd);
BUG_ON(flush_ret < 0);
return ret;
}
@ -3914,7 +3932,8 @@ static int extent_write_cache_pages(struct address_space *mapping,
* tmpfs file mapping
*/
if (!trylock_page(page)) {
flush_write_bio(epd);
ret = flush_write_bio(epd);
BUG_ON(ret < 0);
lock_page(page);
}
@ -3924,8 +3943,10 @@ static int extent_write_cache_pages(struct address_space *mapping,
}
if (wbc->sync_mode != WB_SYNC_NONE) {
if (PageWriteback(page))
flush_write_bio(epd);
if (PageWriteback(page)) {
ret = flush_write_bio(epd);
BUG_ON(ret < 0);
}
wait_on_page_writeback(page);
}
@ -3986,6 +4007,7 @@ static int extent_write_cache_pages(struct address_space *mapping,
int extent_write_full_page(struct page *page, struct writeback_control *wbc)
{
int ret;
int flush_ret;
struct extent_page_data epd = {
.bio = NULL,
.tree = &BTRFS_I(page->mapping->host)->io_tree,
@ -3995,7 +4017,8 @@ int extent_write_full_page(struct page *page, struct writeback_control *wbc)
ret = __extent_writepage(page, wbc, &epd);
flush_write_bio(&epd);
flush_ret = flush_write_bio(&epd);
BUG_ON(flush_ret < 0);
return ret;
}
@ -4003,6 +4026,7 @@ int extent_write_locked_range(struct inode *inode, u64 start, u64 end,
int mode)
{
int ret = 0;
int flush_ret;
struct address_space *mapping = inode->i_mapping;
struct extent_io_tree *tree = &BTRFS_I(inode)->io_tree;
struct page *page;
@ -4035,7 +4059,8 @@ int extent_write_locked_range(struct inode *inode, u64 start, u64 end,
start += PAGE_SIZE;
}
flush_write_bio(&epd);
flush_ret = flush_write_bio(&epd);
BUG_ON(flush_ret < 0);
return ret;
}
@ -4043,6 +4068,7 @@ 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,
@ -4051,7 +4077,8 @@ int extent_writepages(struct address_space *mapping,
};
ret = extent_write_cache_pages(mapping, wbc, &epd);
flush_write_bio(&epd);
flush_ret = flush_write_bio(&epd);
BUG_ON(flush_ret < 0);
return ret;
}