diff options
| author | Lukas Czerner <lczerner@redhat.com> | 2013-05-21 23:17:23 -0400 |
|---|---|---|
| committer | Mister Oyster <oysterized@gmail.com> | 2017-05-27 19:40:07 +0200 |
| commit | 0551d8297007e2b3c558299fd91a38ba9b174500 (patch) | |
| tree | 4c36f9e3e98af4095050c9c9e50bdd4357f8ef0f /include/linux | |
| parent | bd0921dfa2c44429d925d8daf29b2f8d0946ff43 (diff) | |
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.
Change-Id: Id47992f86b307985b3215bcf141d56d1849d71df
Signed-off-by: Lukas Czerner <lczerner@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Hugh Dickins <hughd@google.com>
(cherry picked from commit d47992f86b307985b3215bcf141d56d1849d71df)
f2fs: removed f2fs modifications bcs of f2fs backports
Signed-off-by: Mister Oyster <oysterized@gmail.com>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/buffer_head.h | 3 | ||||
| -rw-r--r-- | include/linux/fs.h | 2 | ||||
| -rw-r--r-- | include/linux/mm.h | 3 |
3 files changed, 5 insertions, 3 deletions
diff --git a/include/linux/buffer_head.h b/include/linux/buffer_head.h index c065c02af..011a37757 100644 --- a/include/linux/buffer_head.h +++ b/include/linux/buffer_head.h @@ -213,7 +213,8 @@ 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, diff --git a/include/linux/fs.h b/include/linux/fs.h index 16c7d1778..929816fd7 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -378,7 +378,7 @@ struct address_space_operations { /* Unfortunately this kludge is needed for FIBMAP. Don't use it */ sector_t (*bmap)(struct address_space *, sector_t); - void (*invalidatepage) (struct page *, unsigned long); + void (*invalidatepage) (struct page *, unsigned int, unsigned int); int (*releasepage) (struct page *, gfp_t); void (*freepage)(struct page *); ssize_t (*direct_IO)(int, struct kiocb *, const struct iovec *iov, diff --git a/include/linux/mm.h b/include/linux/mm.h index 6018d46d3..ff06e0e6c 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -1101,7 +1101,8 @@ int get_kernel_page(unsigned long start, int write, struct page **pages); struct page *get_dump_page(unsigned long addr); extern int try_to_release_page(struct page * page, gfp_t gfp_mask); -extern void do_invalidatepage(struct page *page, unsigned long offset); +extern void do_invalidatepage(struct page *page, unsigned int offset, + unsigned int length); int __set_page_dirty_nobuffers(struct page *page); int __set_page_dirty_no_writeback(struct page *page); |