From: Wang Xiaoguang <wangxg.f...@cn.fujitsu.com>
Add ioctl interface for inband deduplication, which includes:
1) enable
2) disable
3) status
We will later add ioctl to disable inband dedup for given file/dir.
Signed-off-by: Qu Wenruo <quwen...@cn.fujitsu.com>
Signed-off-by: Wang Xiaoguang <wangxg.f...@cn.fujitsu.com>
---
fs/btrfs/dedup.c | 48 ++++++++++++++++++++++++++++++++++++++-----
fs/btrfs/dedup.h | 10 ++++++++-
fs/btrfs/ioctl.c | 51 ++++++++++++++++++++++++++++++++++++++++++++++
fs/btrfs/sysfs.c | 2 ++
include/uapi/linux/btrfs.h | 24 ++++++++++++++++++++++
5 files changed, 129 insertions(+), 6 deletions(-)
diff --git a/fs/btrfs/dedup.c b/fs/btrfs/dedup.c
index 8972cff..b7ecb8f 100644
--- a/fs/btrfs/dedup.c
+++ b/fs/btrfs/dedup.c
@@ -135,12 +135,12 @@ out:
}
int btrfs_dedup_enable(struct btrfs_fs_info *fs_info, u16 type, u16 backend,
- u64 blocksize, u64 limit_nr)
+ u64 blocksize, u64 limit_nr, u64 limit_mem)
{
struct btrfs_dedup_info *dedup_info;
int create_tree;
u64 compat_ro_flag = btrfs_super_compat_ro_flags(fs_info->super_copy);
- u64 limit = limit_nr;
+ u64 limit;
int ret = 0;
/* Sanity check */
@@ -153,11 +153,22 @@ int btrfs_dedup_enable(struct btrfs_fs_info *fs_info, u16
type, u16 backend,
return -EINVAL;
if (backend >= BTRFS_DEDUP_BACKEND_LAST)
return -EINVAL;
+ /* Only one limit is accept */
+ if (limit_nr && limit_mem)
+ return -EINVAL;
- if (backend == BTRFS_DEDUP_BACKEND_INMEMORY && limit_nr == 0)
- limit = 4096; /* default value */
- if (backend == BTRFS_DEDUP_BACKEND_ONDISK && limit_nr != 0)
+ if (backend == BTRFS_DEDUP_BACKEND_INMEMORY) {
+ if (!limit_nr && !limit_mem)
+ limit = BTRFS_DEDUP_LIMIT_NR_DEFAULT;
+ else if (limit_nr)
+ limit = limit_nr;
+ else
+ limit = limit_mem / (sizeof(struct inmem_hash) +
+ btrfs_dedup_sizes[type]);
+ }
+ if (backend == BTRFS_DEDUP_BACKEND_ONDISK)
limit = 0;
+
/* Ondisk backend needs DEDUP RO compat feature */
if (!(compat_ro_flag & BTRFS_FEATURE_COMPAT_RO_DEDUP) &&
backend == BTRFS_DEDUP_BACKEND_ONDISK)
@@ -208,6 +219,33 @@ out:
return ret;
}
+void btrfs_dedup_status(struct btrfs_fs_info *fs_info,
+ struct btrfs_ioctl_dedup_args *dargs)
+{
+ struct btrfs_dedup_info *dedup_info = fs_info->dedup_info;
+
+ if (!fs_info->dedup_enabled || !dedup_info) {
+ dargs->status = 0;
+ dargs->blocksize = 0;
+ dargs->backend = 0;
+ dargs->hash_type = 0;
+ dargs->limit_nr = 0;
+ dargs->current_nr = 0;
+ return;
+ }
+ mutex_lock(&dedup_info->lock);
+ dargs->status = 1;
+ dargs->blocksize = dedup_info->blocksize;
+ dargs->backend = dedup_info->backend;
+ dargs->hash_type = dedup_info->hash_type;
+ dargs->limit_nr = dedup_info->limit_nr;
+ dargs->limit_mem = dedup_info->limit_nr *
+ (sizeof(struct inmem_hash) +
+ btrfs_dedup_sizes[dedup_info->hash_type]);
+ dargs->current_nr = dedup_info->current_nr;
+ mutex_unlock(&dedup_info->lock);
+}
+
int btrfs_dedup_resume(struct btrfs_fs_info *fs_info,
struct btrfs_root *dedup_root)
{
diff --git a/fs/btrfs/dedup.h b/fs/btrfs/dedup.h
index a580072..8a99a7f 100644
--- a/fs/btrfs/dedup.h
+++ b/fs/btrfs/dedup.h
@@ -100,7 +100,15 @@ static inline struct btrfs_dedup_hash
*btrfs_dedup_alloc_hash(u16 type)
* Called at dedup enable time.
*/
int btrfs_dedup_enable(struct btrfs_fs_info *fs_info, u16 type, u16 backend,
- u64 blocksize, u64 limit_nr);
+ u64 blocksize, u64 limit_nr, u64 limit_mem);
+
+/*
+ * Get inband dedup info
+ * Since it needs to access different backends' hash size, which
+ * is not exported, we need such simple function.
+ */
+void btrfs_dedup_status(struct btrfs_fs_info *fs_info,
+ struct btrfs_ioctl_dedup_args *dargs);
/*
* Disable dedup and invalidate all its dedup data.
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 1568f57..2bd1a97 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -59,6 +59,7 @@
#include "props.h"
#include "sysfs.h"
#include "qgroup.h"
+#include "dedup.h"
#ifdef CONFIG_64BIT
/* If we have a 32-bit userspace and 64-bit kernel, then the UAPI
@@ -3220,6 +3221,54 @@ out:
return ret;
}
+static long btrfs_ioctl_dedup_ctl(struct btrfs_root *root, void __user *args)
+{
+ struct btrfs_ioctl_dedup_args *dargs;
+ struct btrfs_fs_info *fs_info = root->fs_info;
+ int ret;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ dargs = memdup_user(args, sizeof(*dargs));
+ if (IS_ERR(dargs)) {
+ ret = PTR_ERR(dargs);
+ return ret;
+ }
+
+ if (dargs->cmd >= BTRFS_DEDUP_CTL_LAST) {
+ ret = -EINVAL;
+ goto out;
+ }
+ switch (dargs->cmd) {
+ case BTRFS_DEDUP_CTL_ENABLE:
+ mutex_lock(&fs_info->dedup_ioctl_lock);
+ ret = btrfs_dedup_enable(fs_info, dargs->hash_type,
+ dargs->backend, dargs->blocksize,
+ dargs->limit_nr, dargs->limit_mem);
+ mutex_unlock(&fs_info->dedup_ioctl_lock);
+ break;
+ case BTRFS_DEDUP_CTL_DISABLE:
+ mutex_lock(&fs_info->dedup_ioctl_lock);
+ ret = btrfs_dedup_disable(fs_info);
+ mutex_unlock(&fs_info->dedup_ioctl_lock);
+ break;
+ case BTRFS_DEDUP_CTL_STATUS:
+ btrfs_dedup_status(fs_info, dargs);
+ if (copy_to_user(args, dargs, sizeof(*dargs)))
+ ret = -EFAULT;
+ else
+ ret = 0;
+ break;
+ default:
+ ret = -EINVAL;
+ break;
+ }
+out:
+ kfree(dargs);
+ return ret;
+}
+
static int clone_finish_inode_update(struct btrfs_trans_handle *trans,
struct inode *inode,
u64 endoff,
@@ -5584,6 +5633,8 @@ long btrfs_ioctl(struct file *file, unsigned int
return btrfs_ioctl_set_fslabel(file, argp);
case BTRFS_IOC_FILE_EXTENT_SAME:
return btrfs_ioctl_file_extent_same(file, argp);
+ case BTRFS_IOC_DEDUP_CTL:
+ return btrfs_ioctl_dedup_ctl(root, argp);
case BTRFS_IOC_GET_SUPPORTED_FEATURES:
return btrfs_ioctl_get_supported_features(file, argp);
case BTRFS_IOC_GET_FEATURES:
diff --git a/fs/btrfs/sysfs.c b/fs/btrfs/sysfs.c
index 539e7b5..75e5ca85 100644
--- a/fs/btrfs/sysfs.c
+++ b/fs/btrfs/sysfs.c
@@ -203,6 +203,7 @@ BTRFS_FEAT_ATTR_INCOMPAT(raid56, RAID56);
BTRFS_FEAT_ATTR_INCOMPAT(skinny_metadata, SKINNY_METADATA);
BTRFS_FEAT_ATTR_INCOMPAT(no_holes, NO_HOLES);
BTRFS_FEAT_ATTR_COMPAT_RO(free_space_tree, FREE_SPACE_TREE);
+BTRFS_FEAT_ATTR_COMPAT_RO(dedup, DEDUP);
static struct attribute *btrfs_supported_feature_attrs[] = {
BTRFS_FEAT_ATTR_PTR(mixed_backref),
@@ -215,6 +216,7 @@ static struct attribute *btrfs_supported_feature_attrs[] = {
BTRFS_FEAT_ATTR_PTR(skinny_metadata),
BTRFS_FEAT_ATTR_PTR(no_holes),
BTRFS_FEAT_ATTR_PTR(free_space_tree),
+ BTRFS_FEAT_ATTR_PTR(dedup),
NULL
};
diff --git a/include/uapi/linux/btrfs.h b/include/uapi/linux/btrfs.h
index dea8931..666f940 100644
--- a/include/uapi/linux/btrfs.h
+++ b/include/uapi/linux/btrfs.h
@@ -445,6 +445,28 @@ struct btrfs_ioctl_get_dev_stats {
__u64 unused[128 - 2 - BTRFS_DEV_STAT_VALUES_MAX]; /* pad to 1k */
};
+/*
+ * de-duplication control modes
+ * For re-config, re-enable will handle it
+ * TODO: Add support to disable per-file/dir dedup operation
+ */
+#define BTRFS_DEDUP_CTL_ENABLE 1
+#define BTRFS_DEDUP_CTL_DISABLE 2
+#define BTRFS_DEDUP_CTL_STATUS 3
+#define BTRFS_DEDUP_CTL_LAST 4
+struct btrfs_ioctl_dedup_args {
+ __u16 cmd; /* In: command(see above macro) */
+ __u64 blocksize; /* In/Out: For enable/status */
+ __u64 limit_nr; /* In/Out: For enable/status */
+ __u64 limit_mem; /* In/Out: For enable/status */
+ __u64 current_nr; /* Out: For status output */
+ __u16 backend; /* In/Out: For enable/status */
+ __u16 hash_type; /* In/Out: For enable/status */
+ u8 status; /* Out: For status output */
+ /* pad to 512 bytes */
+ u8 __unused[473];
+};
+
#define BTRFS_QUOTA_CTL_ENABLE 1
#define BTRFS_QUOTA_CTL_DISABLE 2
#define BTRFS_QUOTA_CTL_RESCAN__NOTUSED 3
@@ -653,6 +675,8 @@ static inline char *btrfs_err_str(enum btrfs_err_code
err_code)
struct btrfs_ioctl_dev_replace_args)
#define BTRFS_IOC_FILE_EXTENT_SAME _IOWR(BTRFS_IOCTL_MAGIC, 54, \
struct btrfs_ioctl_same_args)
+#define BTRFS_IOC_DEDUP_CTL _IOWR(BTRFS_IOCTL_MAGIC, 55, \
+ struct btrfs_ioctl_dedup_args)
#define BTRFS_IOC_GET_FEATURES _IOR(BTRFS_IOCTL_MAGIC, 57, \
struct btrfs_ioctl_feature_flags)
#define BTRFS_IOC_SET_FEATURES _IOW(BTRFS_IOCTL_MAGIC, 57, \
--
2.7.0
--
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