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authorTheodore Ts'o <tytso@mit.edu>2009-01-03 09:47:09 -0500
committerTheodore Ts'o <tytso@mit.edu>2009-01-03 09:47:09 -0500
commit87d8fe1ee6b8d2f95076142d58c440dba4e7bdc2 (patch)
tree8c91506978a16c22268b086f693e307de0ca57db /fs
parent0087d9fb3f29f59e8d42c8b058376d80e5adde4c (diff)
downloadop-kernel-dev-87d8fe1ee6b8d2f95076142d58c440dba4e7bdc2.zip
op-kernel-dev-87d8fe1ee6b8d2f95076142d58c440dba4e7bdc2.tar.gz
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')
-rw-r--r--fs/block_dev.c15
-rw-r--r--fs/super.c2
2 files changed, 17 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,
};
diff --git a/fs/super.c b/fs/super.c
index ddba069..d5fd449 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -800,6 +800,7 @@ int get_sb_bdev(struct file_system_type *fs_type,
}
s->s_flags |= MS_ACTIVE;
+ bdev->bd_super = s;
}
return simple_set_mnt(mnt, s);
@@ -819,6 +820,7 @@ void kill_block_super(struct super_block *sb)
struct block_device *bdev = sb->s_bdev;
fmode_t mode = sb->s_mode;
+ bdev->bd_super = 0;
generic_shutdown_super(sb);
sync_blockdev(bdev);
close_bdev_exclusive(bdev, mode);
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