[PATCH v6 17/19] btrfs: dedup: add a property handler for online dedup
From: Qu Wenruo <hidden>
Date: 2016-02-05 01:25:03
Subsystem:
btrfs file system, filesystems (vfs and infrastructure), the rest · Maintainers:
Chris Mason, David Sterba, Alexander Viro, Christian Brauner, Linus Torvalds
From: Wang Xiaoguang <redacted> We use btrfs extended attribute "btrfs.dedup" to record per-file online dedup status, so add a dedup property handler. Signed-off-by: Wang Xiaoguang <redacted> --- fs/btrfs/props.c | 40 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 40 insertions(+)
diff --git a/fs/btrfs/props.c b/fs/btrfs/props.c
index f9e6023..fb82080 100644
--- a/fs/btrfs/props.c
+++ b/fs/btrfs/props.c@@ -41,6 +41,10 @@ static int prop_compression_apply(struct inode *inode, size_t len); static const char *prop_compression_extract(struct inode *inode); +static int prop_dedup_validate(const char *value, size_t len); +static int prop_dedup_apply(struct inode *inode, const char *value, size_t len); +static const char *prop_dedup_extract(struct inode *inode); + static struct prop_handler prop_handlers[] = { { .xattr_name = XATTR_BTRFS_PREFIX "compression",
@@ -49,6 +53,13 @@ static struct prop_handler prop_handlers[] = { .extract = prop_compression_extract, .inheritable = 1 }, + { + .xattr_name = XATTR_BTRFS_PREFIX "dedup", + .validate = prop_dedup_validate, + .apply = prop_dedup_apply, + .extract = prop_dedup_extract, + .inheritable = 1 + }, }; void __init btrfs_props_init(void)
@@ -425,4 +436,33 @@ static const char *prop_compression_extract(struct inode *inode) return NULL; } +static int prop_dedup_validate(const char *value, size_t len) +{ + if (!strncmp("disable", value, len)) + return 0; + + return -EINVAL; +} + +static int prop_dedup_apply(struct inode *inode, const char *value, size_t len) +{ + if (len == 0) { + BTRFS_I(inode)->flags &= ~BTRFS_INODE_NODEDUP; + return 0; + } + + if (!strncmp("disable", value, len)) { + BTRFS_I(inode)->flags |= BTRFS_INODE_NODEDUP; + return 0; + } + + return -EINVAL; +} + +static const char *prop_dedup_extract(struct inode *inode) +{ + if (BTRFS_I(inode)->flags & BTRFS_INODE_NODEDUP) + return "disable"; + return NULL; +}
--
2.7.0