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| author | Lukas Czerner <lczerner@redhat.com> | 2013-05-21 23:17:23 -0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2013-05-21 23:17:23 -0400 |
| commit | d47992f86b307985b3215bcf141d56d1849d71df (patch) | |
| tree | e1ae47bd19185371462c5a273c15276534447349 /include/linux/buffer_head.h | |
| parent | c7788792a5e7b0d5d7f96d0766b4cb6112d47d75 (diff) | |
| download | linux-d47992f86b307985b3215bcf141d56d1849d71df.tar.gz linux-d47992f86b307985b3215bcf141d56d1849d71df.tar.bz2 linux-d47992f86b307985b3215bcf141d56d1849d71df.zip | |
mm: change invalidatepage prototype to accept length
Currently there is no way to truncate partial page where the end
truncate point is not at the end of the page. This is because it was not
needed and the functionality was enough for file system truncate
operation to work properly. However more file systems now support punch
hole feature and it can benefit from mm supporting truncating page just
up to the certain point.
Specifically, with this functionality truncate_inode_pages_range() can
be changed so it supports truncating partial page at the end of the
range (currently it will BUG_ON() if 'end' is not at the end of the
page).
This commit changes the invalidatepage() address space operation
prototype to accept range to be invalidated and update all the instances
for it.
We also change the block_invalidatepage() in the same way and actually
make a use of the new length argument implementing range invalidation.
Actual file system implementations will follow except the file systems
where the changes are really simple and should not change the behaviour
in any way .Implementation for truncate_page_range() which will be able
to accept page unaligned ranges will follow as well.
Signed-off-by: Lukas Czerner <lczerner@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Hugh Dickins <hughd@google.com>
Diffstat (limited to 'include/linux/buffer_head.h')
| -rw-r--r-- | include/linux/buffer_head.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/include/linux/buffer_head.h b/include/linux/buffer_head.h index 9e52b0626b39..f5a3b838ddb0 100644 --- a/include/linux/buffer_head.h +++ b/include/linux/buffer_head.h @@ -198,7 +198,8 @@ extern int buffer_heads_over_limit; * Generic address_space_operations implementations for buffer_head-backed * address_spaces. */ -void block_invalidatepage(struct page *page, unsigned long offset); +void block_invalidatepage(struct page *page, unsigned int offset, + unsigned int length); int block_write_full_page(struct page *page, get_block_t *get_block, struct writeback_control *wbc); int block_write_full_page_endio(struct page *page, get_block_t *get_block, |