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btrfs: add dummy callback for readpage_io_failed and drop checks

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Make extent_io_ops::readpage_io_failed_hook callback mandatory and
define a dummy function for btrfs_extent_io_ops. As the failed IO
callback is not performance critical, the branch vs extra trade off does
not hurt.

Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba
2017-02-17 16:24:29 +01:00
parent 20c9801d39
commit 20a7db8ab3
4 changed files with 10 additions and 3 deletions
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2
fs/btrfs/extent_io.h
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@@ -103,6 +103,7 @@ struct extent_io_ops {
int (*merge_bio_hook)(struct page *page, unsigned long offset,
size_t size, struct bio *bio,
unsigned long bio_flags);
int (*readpage_io_failed_hook)(struct page *page, int failed_mirror);
/*
* Optional hooks, called if the pointer is not NULL
@@ -110,7 +111,6 @@ struct extent_io_ops {
int (*fill_delalloc)(struct inode *inode, struct page *locked_page,
u64 start, u64 end, int *page_started,
unsigned long *nr_written);
int (*readpage_io_failed_hook)(struct page *page, int failed_mirror);
int (*writepage_start_hook)(struct page *page, u64 start, u64 end);
void (*writepage_end_io_hook)(struct page *page, u64 start, u64 end,