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author | Theodore Ts'o <tytso@mit.edu> | 2009-01-03 09:47:09 -0500 |
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committer | Theodore Ts'o <tytso@mit.edu> | 2009-01-03 09:47:09 -0500 |
commit | 87d8fe1ee6b8d2f95076142d58c440dba4e7bdc2 (patch) | |
tree | 8c91506978a16c22268b086f693e307de0ca57db /fs/block_dev.c | |
parent | 0087d9fb3f29f59e8d42c8b058376d80e5adde4c (diff) | |
download | kernel_samsung_smdk4412-87d8fe1ee6b8d2f95076142d58c440dba4e7bdc2.zip kernel_samsung_smdk4412-87d8fe1ee6b8d2f95076142d58c440dba4e7bdc2.tar.gz kernel_samsung_smdk4412-87d8fe1ee6b8d2f95076142d58c440dba4e7bdc2.tar.bz2 |
add releasepage hooks to block devices which can be used by file systems
Implement blkdev_releasepage() to release the buffer_heads and pages
after we release private data belonging to a mounted filesystem.
Cc: Toshiyuki Okajima <toshi.okajima@jp.fujitsu.com>
Cc: linux-fsdevel@vger.kernel.org
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'fs/block_dev.c')
-rw-r--r-- | fs/block_dev.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/fs/block_dev.c b/fs/block_dev.c index 349a26c..1dd07e6 100644 --- a/fs/block_dev.c +++ b/fs/block_dev.c @@ -1220,6 +1220,20 @@ static long block_ioctl(struct file *file, unsigned cmd, unsigned long arg) return blkdev_ioctl(bdev, mode, cmd, arg); } +/* + * Try to release a page associated with block device when the system + * is under memory pressure. + */ +static int blkdev_releasepage(struct page *page, gfp_t wait) +{ + struct super_block *super = BDEV_I(page->mapping->host)->bdev.bd_super; + + if (super && super->s_op->bdev_try_to_free_page) + return super->s_op->bdev_try_to_free_page(super, page, wait); + + return try_to_free_buffers(page); +} + static const struct address_space_operations def_blk_aops = { .readpage = blkdev_readpage, .writepage = blkdev_writepage, @@ -1227,6 +1241,7 @@ static const struct address_space_operations def_blk_aops = { .write_begin = blkdev_write_begin, .write_end = blkdev_write_end, .writepages = generic_writepages, + .releasepage = blkdev_releasepage, .direct_IO = blkdev_direct_IO, }; |