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path: root/fs/btrfs/ioctl.c
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Diffstat (limited to 'fs/btrfs/ioctl.c')
-rw-r--r--fs/btrfs/ioctl.c81
1 files changed, 29 insertions, 52 deletions
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index c2837a32d689..d3a5d2a41e5f 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -5,23 +5,18 @@
#include <linux/kernel.h>
#include <linux/bio.h>
-#include <linux/buffer_head.h>
#include <linux/file.h>
#include <linux/fs.h>
#include <linux/fsnotify.h>
#include <linux/pagemap.h>
#include <linux/highmem.h>
#include <linux/time.h>
-#include <linux/init.h>
#include <linux/string.h>
#include <linux/backing-dev.h>
#include <linux/mount.h>
-#include <linux/mpage.h>
#include <linux/namei.h>
-#include <linux/swap.h>
#include <linux/writeback.h>
#include <linux/compat.h>
-#include <linux/bit_spinlock.h>
#include <linux/security.h>
#include <linux/xattr.h>
#include <linux/mm.h>
@@ -606,7 +601,7 @@ static noinline int create_subvol(struct inode *dir,
trans->block_rsv = &block_rsv;
trans->bytes_reserved = block_rsv.size;
- ret = btrfs_qgroup_inherit(trans, fs_info, 0, objectid, inherit);
+ ret = btrfs_qgroup_inherit(trans, 0, objectid, inherit);
if (ret)
goto fail;
@@ -616,14 +611,6 @@ static noinline int create_subvol(struct inode *dir,
goto fail;
}
- memzero_extent_buffer(leaf, 0, sizeof(struct btrfs_header));
- btrfs_set_header_bytenr(leaf, leaf->start);
- btrfs_set_header_generation(leaf, trans->transid);
- btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV);
- btrfs_set_header_owner(leaf, objectid);
-
- write_extent_buffer_fsid(leaf, fs_info->fsid);
- write_extent_buffer_chunk_tree_uuid(leaf, fs_info->chunk_tree_uuid);
btrfs_mark_buffer_dirty(leaf);
inode_item = &root_item->inode;
@@ -711,8 +698,7 @@ static noinline int create_subvol(struct inode *dir,
ret = btrfs_update_inode(trans, root, dir);
BUG_ON(ret);
- ret = btrfs_add_root_ref(trans, fs_info,
- objectid, root->root_key.objectid,
+ ret = btrfs_add_root_ref(trans, objectid, root->root_key.objectid,
btrfs_ino(BTRFS_I(dir)), index, name, namelen);
BUG_ON(ret);
@@ -2507,8 +2493,8 @@ out:
static noinline int btrfs_ioctl_ino_lookup(struct file *file,
void __user *argp)
{
- struct btrfs_ioctl_ino_lookup_args *args;
- struct inode *inode;
+ struct btrfs_ioctl_ino_lookup_args *args;
+ struct inode *inode;
int ret = 0;
args = memdup_user(argp, sizeof(*args));
@@ -2941,8 +2927,14 @@ static int btrfs_ioctl_defrag(struct file *file, void __user *argp)
ret = btrfs_defrag_root(root);
break;
case S_IFREG:
- if (!(file->f_mode & FMODE_WRITE)) {
- ret = -EINVAL;
+ /*
+ * Note that this does not check the file descriptor for write
+ * access. This prevents defragmenting executables that are
+ * running and allows defrag on files open in read-only mode.
+ */
+ if (!capable(CAP_SYS_ADMIN) &&
+ inode_permission(inode, MAY_WRITE)) {
+ ret = -EPERM;
goto out;
}
@@ -3165,10 +3157,8 @@ static long btrfs_ioctl_dev_info(struct btrfs_fs_info *fs_info,
di_args->total_bytes = btrfs_device_get_total_bytes(dev);
memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid));
if (dev->name) {
- struct rcu_string *name;
-
- name = rcu_dereference(dev->name);
- strncpy(di_args->path, name->str, sizeof(di_args->path) - 1);
+ strncpy(di_args->path, rcu_str_deref(dev->name),
+ sizeof(di_args->path) - 1);
di_args->path[sizeof(di_args->path) - 1] = 0;
} else {
di_args->path[0] = '\0';
@@ -3327,11 +3317,13 @@ static void btrfs_cmp_data_free(struct cmp_pages *cmp)
if (pg) {
unlock_page(pg);
put_page(pg);
+ cmp->src_pages[i] = NULL;
}
pg = cmp->dst_pages[i];
if (pg) {
unlock_page(pg);
put_page(pg);
+ cmp->dst_pages[i] = NULL;
}
}
}
@@ -3577,7 +3569,7 @@ static int btrfs_extent_same(struct inode *src, u64 loff, u64 olen,
ret = btrfs_extent_same_range(src, loff, BTRFS_MAX_DEDUPE_LEN,
dst, dst_loff, &cmp);
if (ret)
- goto out_unlock;
+ goto out_free;
loff += BTRFS_MAX_DEDUPE_LEN;
dst_loff += BTRFS_MAX_DEDUPE_LEN;
@@ -3587,16 +3579,16 @@ static int btrfs_extent_same(struct inode *src, u64 loff, u64 olen,
ret = btrfs_extent_same_range(src, loff, tail_len, dst,
dst_loff, &cmp);
+out_free:
+ kvfree(cmp.src_pages);
+ kvfree(cmp.dst_pages);
+
out_unlock:
if (same_inode)
inode_unlock(src);
else
btrfs_double_inode_unlock(src, dst);
-out_free:
- kvfree(cmp.src_pages);
- kvfree(cmp.dst_pages);
-
return ret;
}
@@ -5116,9 +5108,7 @@ static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg)
struct inode *inode = file_inode(file);
struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
struct btrfs_ioctl_quota_ctl_args *sa;
- struct btrfs_trans_handle *trans = NULL;
int ret;
- int err;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
@@ -5134,28 +5124,19 @@ static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg)
}
down_write(&fs_info->subvol_sem);
- trans = btrfs_start_transaction(fs_info->tree_root, 2);
- if (IS_ERR(trans)) {
- ret = PTR_ERR(trans);
- goto out;
- }
switch (sa->cmd) {
case BTRFS_QUOTA_CTL_ENABLE:
- ret = btrfs_quota_enable(trans, fs_info);
+ ret = btrfs_quota_enable(fs_info);
break;
case BTRFS_QUOTA_CTL_DISABLE:
- ret = btrfs_quota_disable(trans, fs_info);
+ ret = btrfs_quota_disable(fs_info);
break;
default:
ret = -EINVAL;
break;
}
- err = btrfs_commit_transaction(trans);
- if (err && !ret)
- ret = err;
-out:
kfree(sa);
up_write(&fs_info->subvol_sem);
drop_write:
@@ -5193,15 +5174,13 @@ static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg)
}
if (sa->assign) {
- ret = btrfs_add_qgroup_relation(trans, fs_info,
- sa->src, sa->dst);
+ ret = btrfs_add_qgroup_relation(trans, sa->src, sa->dst);
} else {
- ret = btrfs_del_qgroup_relation(trans, fs_info,
- sa->src, sa->dst);
+ ret = btrfs_del_qgroup_relation(trans, sa->src, sa->dst);
}
/* update qgroup status and info */
- err = btrfs_run_qgroups(trans, fs_info);
+ err = btrfs_run_qgroups(trans);
if (err < 0)
btrfs_handle_fs_error(fs_info, err,
"failed to update qgroup status and info");
@@ -5219,7 +5198,6 @@ drop_write:
static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg)
{
struct inode *inode = file_inode(file);
- struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
struct btrfs_root *root = BTRFS_I(inode)->root;
struct btrfs_ioctl_qgroup_create_args *sa;
struct btrfs_trans_handle *trans;
@@ -5251,9 +5229,9 @@ static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg)
}
if (sa->create) {
- ret = btrfs_create_qgroup(trans, fs_info, sa->qgroupid);
+ ret = btrfs_create_qgroup(trans, sa->qgroupid);
} else {
- ret = btrfs_remove_qgroup(trans, fs_info, sa->qgroupid);
+ ret = btrfs_remove_qgroup(trans, sa->qgroupid);
}
err = btrfs_end_transaction(trans);
@@ -5270,7 +5248,6 @@ drop_write:
static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg)
{
struct inode *inode = file_inode(file);
- struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
struct btrfs_root *root = BTRFS_I(inode)->root;
struct btrfs_ioctl_qgroup_limit_args *sa;
struct btrfs_trans_handle *trans;
@@ -5303,7 +5280,7 @@ static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg)
qgroupid = root->root_key.objectid;
}
- ret = btrfs_limit_qgroup(trans, fs_info, qgroupid, &sa->lim);
+ ret = btrfs_limit_qgroup(trans, qgroupid, &sa->lim);
err = btrfs_end_transaction(trans);
if (err && !ret)
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