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author | David Howells <dhowells@redhat.com> | 2006-08-29 19:05:54 +0100 |
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committer | Jens Axboe <axboe@nelson.home.kernel.dk> | 2006-09-30 20:31:19 +0200 |
commit | cf9a2ae8d49948f861b56e5333530e491a9da190 (patch) | |
tree | 21f0b0d781b3e60cc60464d39b6d95681201b37e /mm/filemap.c | |
parent | 4090959aee403817ff386415f9bc602c1a0882ef (diff) | |
download | kernel_samsung_smdk4412-cf9a2ae8d49948f861b56e5333530e491a9da190.zip kernel_samsung_smdk4412-cf9a2ae8d49948f861b56e5333530e491a9da190.tar.gz kernel_samsung_smdk4412-cf9a2ae8d49948f861b56e5333530e491a9da190.tar.bz2 |
[PATCH] BLOCK: Move functions out of buffer code [try #6]
Move some functions out of the buffering code that aren't strictly buffering
specific. This is a precursor to being able to disable the block layer.
(*) Moved some stuff out of fs/buffer.c:
(*) The file sync and general sync stuff moved to fs/sync.c.
(*) The superblock sync stuff moved to fs/super.c.
(*) do_invalidatepage() moved to mm/truncate.c.
(*) try_to_release_page() moved to mm/filemap.c.
(*) Moved some related declarations between header files:
(*) declarations for do_invalidatepage() and try_to_release_page() moved
to linux/mm.h.
(*) __set_page_dirty_buffers() moved to linux/buffer_head.h.
Signed-Off-By: David Howells <dhowells@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'mm/filemap.c')
-rw-r--r-- | mm/filemap.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/mm/filemap.c b/mm/filemap.c index 3277f3b..d6846de 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -2491,3 +2491,33 @@ generic_file_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov, } return retval; } + +/** + * try_to_release_page() - release old fs-specific metadata on a page + * + * @page: the page which the kernel is trying to free + * @gfp_mask: memory allocation flags (and I/O mode) + * + * The address_space is to try to release any data against the page + * (presumably at page->private). If the release was successful, return `1'. + * Otherwise return zero. + * + * The @gfp_mask argument specifies whether I/O may be performed to release + * this page (__GFP_IO), and whether the call may block (__GFP_WAIT). + * + * NOTE: @gfp_mask may go away, and this function may become non-blocking. + */ +int try_to_release_page(struct page *page, gfp_t gfp_mask) +{ + struct address_space * const mapping = page->mapping; + + BUG_ON(!PageLocked(page)); + if (PageWriteback(page)) + return 0; + + if (mapping && mapping->a_ops->releasepage) + return mapping->a_ops->releasepage(page, gfp_mask); + return try_to_free_buffers(page); +} + +EXPORT_SYMBOL(try_to_release_page); |