From: Wang Xiaoguang <wangxg.fnst@xxxxxxxxxxxxxx>
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 <quwenruo@xxxxxxxxxxxxxx>
Signed-off-by: Wang Xiaoguang <wangxg.fnst@xxxxxxxxxxxxxx>
---
fs/btrfs/ctree.h | 1 +
fs/btrfs/disk-io.c | 1 +
fs/btrfs/ioctl.c | 63 ++++++++++++++++++++++++++++++++++++++++++++++
include/uapi/linux/btrfs.h | 23 +++++++++++++++++
4 files changed, 88 insertions(+)
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 60a10e4..9b9fbb6 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -1864,6 +1864,7 @@ struct btrfs_fs_info {
/* reference to inband de-duplication info */
struct btrfs_dedup_info *dedup_info;
+ struct mutex dedup_ioctl_mutex;
};
struct btrfs_subvolume_writers {
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 0d84e17..341f4f0 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -2562,6 +2562,7 @@ int open_ctree(struct super_block *sb,
mutex_init(&fs_info->delete_unused_bgs_mutex);
mutex_init(&fs_info->reloc_mutex);
mutex_init(&fs_info->delalloc_root_mutex);
+ mutex_init(&fs_info->dedup_ioctl_mutex);
seqlock_init(&fs_info->profiles_lock);
init_rwsem(&fs_info->delayed_iput_sem);
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 7375cf2..6749c84 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
@@ -3206,6 +3207,66 @@ 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;
+ struct btrfs_dedup_info *dedup_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:
+ ret = btrfs_dedup_enable(fs_info, dargs->hash_type,
+ dargs->backend, dargs->blocksize,
+ dargs->limit_nr);
+ break;
+ case BTRFS_DEDUP_CTL_DISABLE:
+ ret = btrfs_dedup_disable(fs_info);
+ break;
+ case BTRFS_DEDUP_CTL_STATUS:
+ dedup_info = fs_info->dedup_info;
+ if (dedup_info) {
+ 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->current_nr = dedup_info->current_nr;
+ } else {
+ dargs->status = 0;
+ dargs->blocksize = 0;
+ dargs->backend = 0;
+ dargs->hash_type = 0;
+ dargs->limit_nr = 0;
+ dargs->current_nr = 0;
+ }
+ 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,
@@ -5565,6 +5626,8 @@ 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/include/uapi/linux/btrfs.h b/include/uapi/linux/btrfs.h
index dea8931..b33da24 100644
--- a/include/uapi/linux/btrfs.h
+++ b/include/uapi/linux/btrfs.h
@@ -445,6 +445,27 @@ 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 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[489];
+};
+
#define BTRFS_QUOTA_CTL_ENABLE 1
#define BTRFS_QUOTA_CTL_DISABLE 2
#define BTRFS_QUOTA_CTL_RESCAN__NOTUSED 3
@@ -653,6 +674,8 @@ 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, \
--
2.6.4
--
To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
