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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 /fs/btrfs | |
| 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 'fs/btrfs')
| -rw-r--r-- | fs/btrfs/disk-io.c | 3 | ||||
| -rw-r--r-- | fs/btrfs/extent_io.c | 2 | ||||
| -rw-r--r-- | fs/btrfs/inode.c | 3 |
3 files changed, 5 insertions, 3 deletions
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c index e7b3cb5286a5..40c7bc300075 100644 --- a/fs/btrfs/disk-io.c +++ b/fs/btrfs/disk-io.c @@ -1013,7 +1013,8 @@ static int btree_releasepage(struct page *page, gfp_t gfp_flags) return try_release_extent_buffer(page); } -static void btree_invalidatepage(struct page *page, unsigned long offset) +static void btree_invalidatepage(struct page *page, unsigned int offset, + unsigned int length) { struct extent_io_tree *tree; tree = &BTRFS_I(page->mapping->host)->io_tree; diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c index e7e7afb4a872..6bca9472f313 100644 --- a/fs/btrfs/extent_io.c +++ b/fs/btrfs/extent_io.c @@ -2957,7 +2957,7 @@ static int __extent_writepage(struct page *page, struct writeback_control *wbc, pg_offset = i_size & (PAGE_CACHE_SIZE - 1); if (page->index > end_index || (page->index == end_index && !pg_offset)) { - page->mapping->a_ops->invalidatepage(page, 0); + page->mapping->a_ops->invalidatepage(page, 0, PAGE_CACHE_SIZE); unlock_page(page); return 0; } diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index af978f7682b3..db57e6384fbb 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -7510,7 +7510,8 @@ static int btrfs_releasepage(struct page *page, gfp_t gfp_flags) return __btrfs_releasepage(page, gfp_flags & GFP_NOFS); } -static void btrfs_invalidatepage(struct page *page, unsigned long offset) +static void btrfs_invalidatepage(struct page *page, unsigned int offset, + unsigned int length) { struct inode *inode = page->mapping->host; struct extent_io_tree *tree; |