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Diffstat (limited to 'fs/btrfs/ioctl.c')
-rw-r--r--fs/btrfs/ioctl.c112
1 files changed, 102 insertions, 10 deletions
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 5fdb2abc4fa7..ffb48d6c5433 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -40,6 +40,7 @@
#include <linux/xattr.h>
#include <linux/vmalloc.h>
#include <linux/slab.h>
+#include <linux/blkdev.h>
#include "compat.h"
#include "ctree.h"
#include "disk-io.h"
@@ -138,6 +139,24 @@ static int btrfs_ioctl_getflags(struct file *file, void __user *arg)
return 0;
}
+static int check_flags(unsigned int flags)
+{
+ if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \
+ FS_NOATIME_FL | FS_NODUMP_FL | \
+ FS_SYNC_FL | FS_DIRSYNC_FL | \
+ FS_NOCOMP_FL | FS_COMPR_FL | \
+ FS_NOCOW_FL | FS_COW_FL))
+ return -EOPNOTSUPP;
+
+ if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL))
+ return -EINVAL;
+
+ if ((flags & FS_NOCOW_FL) && (flags & FS_COW_FL))
+ return -EINVAL;
+
+ return 0;
+}
+
static int btrfs_ioctl_setflags(struct file *file, void __user *arg)
{
struct inode *inode = file->f_path.dentry->d_inode;
@@ -153,12 +172,11 @@ static int btrfs_ioctl_setflags(struct file *file, void __user *arg)
if (copy_from_user(&flags, arg, sizeof(flags)))
return -EFAULT;
- if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \
- FS_NOATIME_FL | FS_NODUMP_FL | \
- FS_SYNC_FL | FS_DIRSYNC_FL))
- return -EOPNOTSUPP;
+ ret = check_flags(flags);
+ if (ret)
+ return ret;
- if (!is_owner_or_cap(inode))
+ if (!inode_owner_or_capable(inode))
return -EACCES;
mutex_lock(&inode->i_mutex);
@@ -201,6 +219,22 @@ static int btrfs_ioctl_setflags(struct file *file, void __user *arg)
else
ip->flags &= ~BTRFS_INODE_DIRSYNC;
+ /*
+ * The COMPRESS flag can only be changed by users, while the NOCOMPRESS
+ * flag may be changed automatically if compression code won't make
+ * things smaller.
+ */
+ if (flags & FS_NOCOMP_FL) {
+ ip->flags &= ~BTRFS_INODE_COMPRESS;
+ ip->flags |= BTRFS_INODE_NOCOMPRESS;
+ } else if (flags & FS_COMPR_FL) {
+ ip->flags |= BTRFS_INODE_COMPRESS;
+ ip->flags &= ~BTRFS_INODE_NOCOMPRESS;
+ }
+ if (flags & FS_NOCOW_FL)
+ ip->flags |= BTRFS_INODE_NODATACOW;
+ else if (flags & FS_COW_FL)
+ ip->flags &= ~BTRFS_INODE_NODATACOW;
trans = btrfs_join_transaction(root, 1);
BUG_ON(IS_ERR(trans));
@@ -213,9 +247,11 @@ static int btrfs_ioctl_setflags(struct file *file, void __user *arg)
btrfs_end_transaction(trans, root);
mnt_drop_write(file->f_path.mnt);
+
+ ret = 0;
out_unlock:
mutex_unlock(&inode->i_mutex);
- return 0;
+ return ret;
}
static int btrfs_ioctl_getversion(struct file *file, int __user *arg)
@@ -225,6 +261,49 @@ static int btrfs_ioctl_getversion(struct file *file, int __user *arg)
return put_user(inode->i_generation, arg);
}
+static noinline int btrfs_ioctl_fitrim(struct file *file, void __user *arg)
+{
+ struct btrfs_root *root = fdentry(file)->d_sb->s_fs_info;
+ struct btrfs_fs_info *fs_info = root->fs_info;
+ struct btrfs_device *device;
+ struct request_queue *q;
+ struct fstrim_range range;
+ u64 minlen = ULLONG_MAX;
+ u64 num_devices = 0;
+ int ret;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ mutex_lock(&fs_info->fs_devices->device_list_mutex);
+ list_for_each_entry(device, &fs_info->fs_devices->devices, dev_list) {
+ if (!device->bdev)
+ continue;
+ q = bdev_get_queue(device->bdev);
+ if (blk_queue_discard(q)) {
+ num_devices++;
+ minlen = min((u64)q->limits.discard_granularity,
+ minlen);
+ }
+ }
+ mutex_unlock(&fs_info->fs_devices->device_list_mutex);
+ if (!num_devices)
+ return -EOPNOTSUPP;
+
+ if (copy_from_user(&range, arg, sizeof(range)))
+ return -EFAULT;
+
+ range.minlen = max(range.minlen, minlen);
+ ret = btrfs_trim_fs(root, &range);
+ if (ret < 0)
+ return ret;
+
+ if (copy_to_user(arg, &range, sizeof(range)))
+ return -EFAULT;
+
+ return 0;
+}
+
static noinline int create_subvol(struct btrfs_root *root,
struct dentry *dentry,
char *name, int namelen,
@@ -294,6 +373,10 @@ static noinline int create_subvol(struct btrfs_root *root,
inode_item->nbytes = cpu_to_le64(root->leafsize);
inode_item->mode = cpu_to_le32(S_IFDIR | 0755);
+ root_item.flags = 0;
+ root_item.byte_limit = 0;
+ inode_item->flags = cpu_to_le64(BTRFS_INODE_ROOT_ITEM_INIT);
+
btrfs_set_root_bytenr(&root_item, leaf->start);
btrfs_set_root_generation(&root_item, trans->transid);
btrfs_set_root_level(&root_item, 0);
@@ -409,7 +492,9 @@ static int create_snapshot(struct btrfs_root *root, struct dentry *dentry,
if (ret)
goto fail;
- btrfs_orphan_cleanup(pending_snapshot->snap);
+ ret = btrfs_orphan_cleanup(pending_snapshot->snap);
+ if (ret)
+ goto fail;
parent = dget_parent(dentry);
inode = btrfs_lookup_dentry(parent->d_inode, dentry);
@@ -1077,7 +1162,7 @@ static noinline int btrfs_ioctl_subvol_setflags(struct file *file,
if (flags & ~BTRFS_SUBVOL_RDONLY)
return -EOPNOTSUPP;
- if (!is_owner_or_cap(inode))
+ if (!inode_owner_or_capable(inode))
return -EACCES;
down_write(&root->fs_info->subvol_sem);
@@ -2202,7 +2287,7 @@ long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg)
struct btrfs_ioctl_space_info space;
struct btrfs_ioctl_space_info *dest;
struct btrfs_ioctl_space_info *dest_orig;
- struct btrfs_ioctl_space_info *user_dest;
+ struct btrfs_ioctl_space_info __user *user_dest;
struct btrfs_space_info *info;
u64 types[] = {BTRFS_BLOCK_GROUP_DATA,
BTRFS_BLOCK_GROUP_SYSTEM,
@@ -2348,12 +2433,17 @@ static noinline long btrfs_ioctl_start_sync(struct file *file, void __user *argp
struct btrfs_root *root = BTRFS_I(file->f_dentry->d_inode)->root;
struct btrfs_trans_handle *trans;
u64 transid;
+ int ret;
trans = btrfs_start_transaction(root, 0);
if (IS_ERR(trans))
return PTR_ERR(trans);
transid = trans->transid;
- btrfs_commit_transaction_async(trans, root, 0);
+ ret = btrfs_commit_transaction_async(trans, root, 0);
+ if (ret) {
+ btrfs_end_transaction(trans, root);
+ return ret;
+ }
if (argp)
if (copy_to_user(argp, &transid, sizeof(transid)))
@@ -2388,6 +2478,8 @@ long btrfs_ioctl(struct file *file, unsigned int
return btrfs_ioctl_setflags(file, argp);
case FS_IOC_GETVERSION:
return btrfs_ioctl_getversion(file, argp);
+ case FITRIM:
+ return btrfs_ioctl_fitrim(file, argp);
case BTRFS_IOC_SNAP_CREATE:
return btrfs_ioctl_snap_create(file, argp, 0);
case BTRFS_IOC_SNAP_CREATE_V2:
generated by cgit v1.2.3 (git 2.39.0) at 2024-07-11 23:26:51 +0300