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authorLinus Torvalds <torvalds@linux-foundation.org>2009-01-08 17:14:59 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2009-01-08 17:14:59 -0800
commit2150edc6c5cf00f7adb54538b9ea2a3e9cedca3f (patch)
treef72a0d85e66f500b4cead348a231e3d3b9f357bc /fs/block_dev.c
parentcd764695b67386a81964f68e9c66efd9f13f4d29 (diff)
parent4b905671d2ea09fd48fed72c581df17e40823f39 (diff)
downloadop-kernel-dev-2150edc6c5cf00f7adb54538b9ea2a3e9cedca3f.zip
op-kernel-dev-2150edc6c5cf00f7adb54538b9ea2a3e9cedca3f.tar.gz
Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4
* 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4: (57 commits) jbd2: Fix oops in jbd2_journal_init_inode() on corrupted fs ext4: Remove "extents" mount option block: Add Kconfig help which notes that ext4 needs CONFIG_LBD ext4: Make printk's consistently prefixed with "EXT4-fs: " ext4: Add sanity checks for the superblock before mounting the filesystem ext4: Add mount option to set kjournald's I/O priority jbd2: Submit writes to the journal using WRITE_SYNC jbd2: Add pid and journal device name to the "kjournald2 starting" message ext4: Add markers for better debuggability ext4: Remove code to create the journal inode ext4: provide function to release metadata pages under memory pressure ext3: provide function to release metadata pages under memory pressure add releasepage hooks to block devices which can be used by file systems ext4: Fix s_dirty_blocks_counter if block allocation failed with nodelalloc ext4: Init the complete page while building buddy cache ext4: Don't allow new groups to be added during block allocation ext4: mark the blocks/inode bitmap beyond end of group as used ext4: Use new buffer_head flag to check uninit group bitmaps initialization ext4: Fix the race between read_inode_bitmap() and ext4_new_inode() ext4: code cleanup ...
Diffstat (limited to 'fs/block_dev.c')
-rw-r--r--fs/block_dev.c15
1 files changed, 15 insertions, 0 deletions
diff --git a/fs/block_dev.c b/fs/block_dev.c
index 8ebbfdf..ac7031f 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -1234,6 +1234,20 @@ 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,
@@ -1241,6 +1255,7 @@ 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,
};
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