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| author | Carlos Maiolino <cmaiolino@redhat.com> | 2020-01-09 16:30:41 +0300 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2020-02-03 16:05:37 +0300 |
| commit | 30460e1ea3e62f8457e087db9a309ed1031630da (patch) | |
| tree | 5397a83545672205eda15c343eaa20b1427920d4 /mm | |
| parent | c79f46a282390e0f5b306007bf7b11a46d529538 (diff) | |
| download | linux-30460e1ea3e62f8457e087db9a309ed1031630da.tar.xz | |
fs: Enable bmap() function to properly return errors
By now, bmap() will either return the physical block number related to
the requested file offset or 0 in case of error or the requested offset
maps into a hole.
This patch makes the needed changes to enable bmap() to proper return
errors, using the return value as an error return, and now, a pointer
must be passed to bmap() to be filled with the mapped physical block.
It will change the behavior of bmap() on return:
- negative value in case of error
- zero on success or map fell into a hole
In case of a hole, the *block will be zero too
Since this is a prep patch, by now, the only error return is -EINVAL if
->bmap doesn't exist.
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Carlos Maiolino <cmaiolino@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/page_io.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/mm/page_io.c b/mm/page_io.c index 3a198deb8bb1..76965be1d40e 100644 --- a/mm/page_io.c +++ b/mm/page_io.c @@ -177,8 +177,9 @@ int generic_swapfile_activate(struct swap_info_struct *sis, cond_resched(); - first_block = bmap(inode, probe_block); - if (first_block == 0) + first_block = probe_block; + ret = bmap(inode, &first_block); + if (ret || !first_block) goto bad_bmap; /* @@ -193,9 +194,11 @@ int generic_swapfile_activate(struct swap_info_struct *sis, block_in_page++) { sector_t block; - block = bmap(inode, probe_block + block_in_page); - if (block == 0) + block = probe_block + block_in_page; + ret = bmap(inode, &block); + if (ret || !block) goto bad_bmap; + if (block != first_block + block_in_page) { /* Discontiguity */ probe_block++; |