Messages in this thread Patch in this message | | | Date | Mon, 30 Mar 2009 10:36:11 +0900 | From | Fernando Luis Vázquez Cao <> | Subject | [PATCH 1/5] block: Add block_flush_device() |
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This patch adds a helper function that should be used by filesystems that need to flush the underlying block device on fsync()/fdatasync().
Signed-off-by: Fernando Luis Vazquez Cao <fernando@oss.ntt.co.jp> ---
diff -urNp linux-2.6.29-orig/fs/buffer.c linux-2.6.29/fs/buffer.c --- linux-2.6.29-orig/fs/buffer.c 2009-03-24 08:12:14.000000000 +0900 +++ linux-2.6.29/fs/buffer.c 2009-03-28 20:43:51.000000000 +0900 @@ -165,6 +165,17 @@ void end_buffer_write_sync(struct buffer put_bh(bh); }
+/* Issue flush of write caches on the block device */ +int block_flush_device(struct super_block *sb) +{ + int ret = 0; + + ret = blkdev_issue_flush(sb->s_bdev, NULL); + + return (ret == -EOPNOTSUPP) ? 0 : ret; +} +EXPORT_SYMBOL(block_flush_device); + /* * Write out and wait upon all the dirty data associated with a block * device via its mapping. Does not take the superblock lock. diff -urNp linux-2.6.29-orig/include/linux/buffer_head.h linux-2.6.29/include/linux/buffer_head.h --- linux-2.6.29-orig/include/linux/buffer_head.h 2009-03-24 08:12:14.000000000 +0900 +++ linux-2.6.29/include/linux/buffer_head.h 2009-03-28 20:43:51.000000000 +0900 @@ -238,6 +238,7 @@ int nobh_write_end(struct file *, struct int nobh_truncate_page(struct address_space *, loff_t, get_block_t *); int nobh_writepage(struct page *page, get_block_t *get_block, struct writeback_control *wbc); +int block_flush_device(struct super_block *sb);
void buffer_init(void);
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