[v4,16/18] btrfs: dedup: add an inode nodedup flag
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Message ID 1452751054-2365-17-git-send-email-quwenruo@cn.fujitsu.com
State New
Headers show

Commit Message

Qu Wenruo Jan. 14, 2016, 5:57 a.m. UTC
From: Wang Xiaoguang <wangxg.fnst@cn.fujitsu.com>

Introduce BTRFS_INODE_NODEDUP flag, then we can explicitly disable
online data deduplication for specified files.

Signed-off-by: Wang Xiaoguang <wangxg.fnst@cn.fujitsu.com>
---
 fs/btrfs/ctree.h | 1 +
 fs/btrfs/ioctl.c | 6 +++++-
 2 files changed, 6 insertions(+), 1 deletion(-)

Patch
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diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index a68e23d..ddc6ff2 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -2400,6 +2400,7 @@  do {                                                                   \
 #define BTRFS_INODE_NOATIME		(1 << 9)
 #define BTRFS_INODE_DIRSYNC		(1 << 10)
 #define BTRFS_INODE_COMPRESS		(1 << 11)
+#define BTRFS_INODE_NODEDUP		(1 << 12)
 
 #define BTRFS_INODE_ROOT_ITEM_INIT	(1 << 31)
 
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index c18be18..32c3aa2 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -159,7 +159,8 @@  void btrfs_update_iflags(struct inode *inode)
 /*
  * Inherit flags from the parent inode.
  *
- * Currently only the compression flags and the cow flags are inherited.
+ * Currently only the compression flags, the dedup flags and the cow
+ * flags are inherited.
  */
 void btrfs_inherit_iflags(struct inode *inode, struct inode *dir)
 {
@@ -184,6 +185,9 @@  void btrfs_inherit_iflags(struct inode *inode, struct inode *dir)
 			BTRFS_I(inode)->flags |= BTRFS_INODE_NODATASUM;
 	}
 
+	if (flags & BTRFS_INODE_NODEDUP)
+		BTRFS_I(inode)->flags |= BTRFS_INODE_NODEDUP;
+
 	btrfs_update_iflags(inode);
 }