Messages in this thread Patch in this message | | | Subject | block: Add block_flush_device() | From | Fernando Luis Vázquez Cao <> | Date | Thu, 12 Feb 2009 19:38:57 +0900 |
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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-rc3-orig/fs/buffer.c linux-2.6.29-rc3/fs/buffer.c --- linux-2.6.29-rc3-orig/fs/buffer.c 2009-01-29 09:47:51.000000000 +0900 +++ linux-2.6.29-rc3/fs/buffer.c 2009-01-29 20:11:29.000000000 +0900 @@ -165,6 +165,24 @@ 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; + + if (!(sb->s_flags & MS_FLUSHONFSYNC)) + return ret; + + ret = blkdev_issue_flush(sb->s_bdev, NULL); + + if (ret == -EOPNOTSUPP) + return 0; + + return 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-rc3-orig/include/linux/buffer_head.h linux-2.6.29-rc3/include/linux/buffer_head.h --- linux-2.6.29-rc3-orig/include/linux/buffer_head.h 2009-01-29 09:47:51.000000000 +0900 +++ linux-2.6.29-rc3/include/linux/buffer_head.h 2009-01-29 19:26:33.000000000 +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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