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btrfs: use new dedupe data function pointer

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Now that the VFS encapsulates the dedupe ioctl, wire up btrfs to it.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Darrick J. Wong 2015-12-19 00:56:05 -08:00 committed by Al Viro
parent 54dbc15172
commit 2b3909f8a7
3 changed files with 16 additions and 97 deletions
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2
fs/btrfs/ctree.h
View File

@ -4024,6 +4024,8 @@ void btrfs_get_block_group_info(struct list_head *groups_list,
struct btrfs_ioctl_space_info *space); struct btrfs_ioctl_space_info *space);
void update_ioctl_balance_args(struct btrfs_fs_info *fs_info, int lock, void update_ioctl_balance_args(struct btrfs_fs_info *fs_info, int lock,
struct btrfs_ioctl_balance_args *bargs); struct btrfs_ioctl_balance_args *bargs);
ssize_t btrfs_dedupe_file_range(struct file *src_file, u64 loff, u64 olen,
struct file *dst_file, u64 dst_loff);
/* file.c */ /* file.c */
int btrfs_auto_defrag_init(void); int btrfs_auto_defrag_init(void);

1
fs/btrfs/file.c
View File

@ -2926,6 +2926,7 @@ const struct file_operations btrfs_file_operations = {
#endif #endif
.copy_file_range = btrfs_copy_file_range, .copy_file_range = btrfs_copy_file_range,
.clone_file_range = btrfs_clone_file_range, .clone_file_range = btrfs_clone_file_range,
.dedupe_file_range = btrfs_dedupe_file_range,
}; };
void btrfs_auto_defrag_exit(void) void btrfs_auto_defrag_exit(void)

110
fs/btrfs/ioctl.c
View File

@ -2962,7 +2962,7 @@ static int btrfs_cmp_data(struct inode *src, u64 loff, struct inode *dst,
flush_dcache_page(dst_page); flush_dcache_page(dst_page);
if (memcmp(addr, dst_addr, cmp_len)) if (memcmp(addr, dst_addr, cmp_len))
ret = BTRFS_SAME_DATA_DIFFERS; ret = -EBADE;
kunmap_atomic(addr); kunmap_atomic(addr);
kunmap_atomic(dst_addr); kunmap_atomic(dst_addr);
@ -3098,53 +3098,16 @@ out_unlock:
#define BTRFS_MAX_DEDUPE_LEN (16 * 1024 * 1024) #define BTRFS_MAX_DEDUPE_LEN (16 * 1024 * 1024)
static long btrfs_ioctl_file_extent_same(struct file *file, ssize_t btrfs_dedupe_file_range(struct file *src_file, u64 loff, u64 olen,
struct btrfs_ioctl_same_args __user *argp) struct file *dst_file, u64 dst_loff)
{ {
struct btrfs_ioctl_same_args *same = NULL; struct inode *src = file_inode(src_file);
struct btrfs_ioctl_same_extent_info *info; struct inode *dst = file_inode(dst_file);
struct inode *src = file_inode(file);
u64 off;
u64 len;
int i;
int ret;
unsigned long size;
u64 bs = BTRFS_I(src)->root->fs_info->sb->s_blocksize; u64 bs = BTRFS_I(src)->root->fs_info->sb->s_blocksize;
bool is_admin = capable(CAP_SYS_ADMIN); ssize_t res;
u16 count;
if (!(file->f_mode & FMODE_READ)) if (olen > BTRFS_MAX_DEDUPE_LEN)
return -EINVAL; olen = BTRFS_MAX_DEDUPE_LEN;
ret = mnt_want_write_file(file);
if (ret)
return ret;
if (get_user(count, &argp->dest_count)) {
ret = -EFAULT;
goto out;
}
size = offsetof(struct btrfs_ioctl_same_args __user, info[count]);
same = memdup_user(argp, size);
if (IS_ERR(same)) {
ret = PTR_ERR(same);
same = NULL;
goto out;
}
off = same->logical_offset;
len = same->length;
/*
* Limit the total length we will dedupe for each operation.
* This is intended to bound the total time spent in this
* ioctl to something sane.
*/
if (len > BTRFS_MAX_DEDUPE_LEN)
len = BTRFS_MAX_DEDUPE_LEN;
if (WARN_ON_ONCE(bs < PAGE_CACHE_SIZE)) { if (WARN_ON_ONCE(bs < PAGE_CACHE_SIZE)) {
/* /*
@ -3152,58 +3115,13 @@ static long btrfs_ioctl_file_extent_same(struct file *file,
* result, btrfs_cmp_data() won't correctly handle * result, btrfs_cmp_data() won't correctly handle
* this situation without an update. * this situation without an update.
*/ */
ret = -EINVAL; return -EINVAL;
goto out;
} }
ret = -EISDIR; res = btrfs_extent_same(src, loff, olen, dst, dst_loff);
if (S_ISDIR(src->i_mode)) if (res)
goto out; return res;
return olen;
ret = -EACCES;
if (!S_ISREG(src->i_mode))
goto out;
/* pre-format output fields to sane values */
for (i = 0; i < count; i++) {
same->info[i].bytes_deduped = 0ULL;
same->info[i].status = 0;
}
for (i = 0, info = same->info; i < count; i++, info++) {
struct inode *dst;
struct fd dst_file = fdget(info->fd);
if (!dst_file.file) {
info->status = -EBADF;
continue;
}
dst = file_inode(dst_file.file);
if (!(is_admin || (dst_file.file->f_mode & FMODE_WRITE))) {
info->status = -EINVAL;
} else if (file->f_path.mnt != dst_file.file->f_path.mnt) {
info->status = -EXDEV;
} else if (S_ISDIR(dst->i_mode)) {
info->status = -EISDIR;
} else if (!S_ISREG(dst->i_mode)) {
info->status = -EACCES;
} else {
info->status = btrfs_extent_same(src, off, len, dst,
info->logical_offset);
if (info->status == 0)
info->bytes_deduped += len;
}
fdput(dst_file);
}
ret = copy_to_user(argp, same, size);
if (ret)
ret = -EFAULT;
out:
mnt_drop_write_file(file);
kfree(same);
return ret;
} }
static int clone_finish_inode_update(struct btrfs_trans_handle *trans, static int clone_finish_inode_update(struct btrfs_trans_handle *trans,
@ -5536,8 +5454,6 @@ long btrfs_ioctl(struct file *file, unsigned int
return btrfs_ioctl_get_fslabel(file, argp); return btrfs_ioctl_get_fslabel(file, argp);
case BTRFS_IOC_SET_FSLABEL: case BTRFS_IOC_SET_FSLABEL:
return btrfs_ioctl_set_fslabel(file, argp); return btrfs_ioctl_set_fslabel(file, argp);
case BTRFS_IOC_FILE_EXTENT_SAME:
return btrfs_ioctl_file_extent_same(file, argp);
case BTRFS_IOC_GET_SUPPORTED_FEATURES: case BTRFS_IOC_GET_SUPPORTED_FEATURES:
return btrfs_ioctl_get_supported_features(file, argp); return btrfs_ioctl_get_supported_features(file, argp);
case BTRFS_IOC_GET_FEATURES: case BTRFS_IOC_GET_FEATURES: