@@ -41,6 +41,35 @@ static inline struct inmem_hash *inmem_alloc_hash(u16 algo)
GFP_NOFS);
}
+void btrfs_dedupe_status(struct btrfs_fs_info *fs_info,
+ struct btrfs_ioctl_dedupe_args *dargs)
+{
+ struct btrfs_dedupe_info *dedupe_info = fs_info->dedupe_info;
+
+ if (!fs_info->dedupe_enabled || !dedupe_info) {
+ dargs->status = 0;
+ dargs->blocksize = 0;
+ dargs->backend = 0;
+ dargs->hash_algo = 0;
+ dargs->limit_nr = 0;
+ dargs->current_nr = 0;
+ memset(dargs->__unused, -1, sizeof(dargs->__unused));
+ return;
+ }
+ mutex_lock(&dedupe_info->lock);
+ dargs->status = 1;
+ dargs->blocksize = dedupe_info->blocksize;
+ dargs->backend = dedupe_info->backend;
+ dargs->hash_algo = dedupe_info->hash_algo;
+ dargs->limit_nr = dedupe_info->limit_nr;
+ dargs->limit_mem = dedupe_info->limit_nr *
+ (sizeof(struct inmem_hash) +
+ btrfs_hash_sizes[dedupe_info->hash_algo]);
+ dargs->current_nr = dedupe_info->current_nr;
+ mutex_unlock(&dedupe_info->lock);
+ memset(dargs->__unused, -1, sizeof(dargs->__unused));
+}
+
static int init_dedupe_info(struct btrfs_dedupe_info **ret_info,
struct btrfs_ioctl_dedupe_args *dargs)
{
@@ -420,6 +449,27 @@ static void unblock_all_writers(struct btrfs_fs_info *fs_info)
percpu_up_write(sb->s_writers.rw_sem + SB_FREEZE_WRITE - 1);
}
+int btrfs_dedupe_cleanup(struct btrfs_fs_info *fs_info)
+{
+ struct btrfs_dedupe_info *dedupe_info;
+
+ fs_info->dedupe_enabled = 0;
+ /* same as disable */
+ smp_wmb();
+ dedupe_info = fs_info->dedupe_info;
+ fs_info->dedupe_info = NULL;
+
+ if (!dedupe_info)
+ return 0;
+
+ if (dedupe_info->backend == BTRFS_DEDUPE_BACKEND_INMEMORY)
+ inmem_destroy(dedupe_info);
+
+ crypto_free_shash(dedupe_info->dedupe_driver);
+ kfree(dedupe_info);
+ return 0;
+}
+
int btrfs_dedupe_disable(struct btrfs_fs_info *fs_info)
{
struct btrfs_dedupe_info *dedupe_info;
@@ -109,6 +109,15 @@ static inline struct btrfs_dedupe_hash *btrfs_dedupe_alloc_hash(u16 algo)
int btrfs_dedupe_enable(struct btrfs_fs_info *fs_info,
struct btrfs_ioctl_dedupe_args *dargs);
+
+ /*
+ * Get inband dedupe info
+ * Since it needs to access different backends' hash size, which
+ * is not exported, we need such simple function.
+ */
+void btrfs_dedupe_status(struct btrfs_fs_info *fs_info,
+ struct btrfs_ioctl_dedupe_args *dargs);
+
/*
* Disable dedupe and invalidate all its dedupe data.
* Called at dedupe disable time.
@@ -120,12 +129,10 @@ int btrfs_dedupe_enable(struct btrfs_fs_info *fs_info,
int btrfs_dedupe_disable(struct btrfs_fs_info *fs_info);
/*
- * Get current dedupe status.
- * Return 0 for success
- * No possible error yet
+ * Cleanup current btrfs_dedupe_info
+ * Called in umount time
*/
-void btrfs_dedupe_status(struct btrfs_fs_info *fs_info,
- struct btrfs_ioctl_dedupe_args *dargs);
+int btrfs_dedupe_cleanup(struct btrfs_fs_info *fs_info);
/*
* Calculate hash for dedupe.
@@ -50,6 +50,7 @@
#include "sysfs.h"
#include "qgroup.h"
#include "compression.h"
+#include "dedupe.h"
#ifdef CONFIG_X86
#include <asm/cpufeature.h>
@@ -3970,6 +3971,8 @@ void close_ctree(struct btrfs_root *root)
btrfs_free_qgroup_config(fs_info);
+ btrfs_dedupe_cleanup(fs_info);
+
if (percpu_counter_sum(&fs_info->delalloc_bytes)) {
btrfs_info(fs_info, "at unmount delalloc count %lld",
percpu_counter_sum(&fs_info->delalloc_bytes));
@@ -3284,6 +3284,69 @@ ssize_t btrfs_dedupe_file_range(struct file *src_file, u64 loff, u64 olen,
return olen;
}
+static long btrfs_ioctl_dedupe_ctl(struct btrfs_root *root, void __user *args)
+{
+ struct btrfs_ioctl_dedupe_args *dargs;
+ struct btrfs_fs_info *fs_info = root->fs_info;
+ int ret = 0;
+
+ 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_DEDUPE_CTL_LAST) {
+ ret = -EINVAL;
+ goto out;
+ }
+ switch (dargs->cmd) {
+ case BTRFS_DEDUPE_CTL_ENABLE:
+ mutex_lock(&fs_info->dedupe_ioctl_lock);
+ ret = btrfs_dedupe_enable(fs_info, dargs);
+ /*
+ * Also copy the result to caller for further use
+ * if enable succeeded.
+ * For error case, dargs is already set up with
+ * special values indicating error reason.
+ */
+ if (!ret)
+ btrfs_dedupe_status(fs_info, dargs);
+ mutex_unlock(&fs_info->dedupe_ioctl_lock);
+ break;
+ case BTRFS_DEDUPE_CTL_DISABLE:
+ mutex_lock(&fs_info->dedupe_ioctl_lock);
+ ret = btrfs_dedupe_disable(fs_info);
+ btrfs_dedupe_status(fs_info, dargs);
+ mutex_unlock(&fs_info->dedupe_ioctl_lock);
+ break;
+ case BTRFS_DEDUPE_CTL_STATUS:
+ mutex_lock(&fs_info->dedupe_ioctl_lock);
+ btrfs_dedupe_status(fs_info, dargs);
+ mutex_unlock(&fs_info->dedupe_ioctl_lock);
+ break;
+ default:
+ /*
+ * Use this return value to inform progs that kernel
+ * doesn't support such new command.
+ */
+ ret = -EOPNOTSUPP;
+ goto out;
+ }
+ /*
+ * All ioctl subcommand will modify user dargs,
+ * Don't override return value unless copy fails
+ */
+ if (copy_to_user(args, dargs, sizeof(*dargs)))
+ ret = -EFAULT;
+out:
+ kfree(dargs);
+ return ret;
+}
+
static int clone_finish_inode_update(struct btrfs_trans_handle *trans,
struct inode *inode,
u64 endoff,
@@ -5638,6 +5701,10 @@ long btrfs_ioctl(struct file *file, unsigned int
return btrfs_ioctl_get_fslabel(file, argp);
case BTRFS_IOC_SET_FSLABEL:
return btrfs_ioctl_set_fslabel(file, argp);
+#ifdef CONFIG_BTRFS_DEBUG
+ case BTRFS_IOC_DEDUPE_CTL:
+ return btrfs_ioctl_dedupe_ctl(root, argp);
+#endif
case BTRFS_IOC_GET_SUPPORTED_FEATURES:
return btrfs_ioctl_get_supported_features(argp);
case BTRFS_IOC_GET_FEATURES:
@@ -206,6 +206,7 @@ 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(dedupe, DEDUPE);
static struct attribute *btrfs_supported_feature_attrs[] = {
BTRFS_FEAT_ATTR_PTR(mixed_backref),
@@ -218,6 +219,7 @@ 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(dedupe),
NULL
};
@@ -250,6 +250,7 @@ struct btrfs_ioctl_fs_info_args {
* first mount when booting older kernel versions.
*/
#define BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE_VALID (1ULL << 1)
+#define BTRFS_FEATURE_COMPAT_RO_DEDUPE (1ULL << 2)
#define BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF (1ULL << 0)
#define BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL (1ULL << 1)
@@ -646,7 +647,14 @@ struct btrfs_ioctl_get_dev_stats {
/* Default dedupe limit on number of hash */
#define BTRFS_DEDUPE_LIMIT_NR_DEFAULT (32 * 1024)
-
+/*
+ * de-duplication control modes
+ * For re-config, re-enable will handle it
+ */
+#define BTRFS_DEDUPE_CTL_ENABLE 1
+#define BTRFS_DEDUPE_CTL_DISABLE 2
+#define BTRFS_DEDUPE_CTL_STATUS 3
+#define BTRFS_DEDUPE_CTL_LAST 4
/*
* This structure is used for dedupe enable/disable/configure
* and status ioctl.
@@ -873,6 +881,8 @@ 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_DEDUPE_CTL _IOWR(BTRFS_IOCTL_MAGIC, 55, \
+ struct btrfs_ioctl_dedupe_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, \