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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.c395
1 files changed, 286 insertions, 109 deletions
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 4b4516770f05..c83086fdda05 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -42,12 +42,12 @@
#include <linux/slab.h>
#include <linux/blkdev.h>
#include <linux/uuid.h>
+#include <linux/btrfs.h>
#include "compat.h"
#include "ctree.h"
#include "disk-io.h"
#include "transaction.h"
#include "btrfs_inode.h"
-#include "ioctl.h"
#include "print-tree.h"
#include "volumes.h"
#include "locking.h"
@@ -152,7 +152,7 @@ void btrfs_inherit_iflags(struct inode *inode, struct inode *dir)
static int btrfs_ioctl_getflags(struct file *file, void __user *arg)
{
- struct btrfs_inode *ip = BTRFS_I(file->f_path.dentry->d_inode);
+ struct btrfs_inode *ip = BTRFS_I(file_inode(file));
unsigned int flags = btrfs_flags_to_ioctl(ip->flags);
if (copy_to_user(arg, &flags, sizeof(flags)))
@@ -177,7 +177,7 @@ static int check_flags(unsigned int flags)
static int btrfs_ioctl_setflags(struct file *file, void __user *arg)
{
- struct inode *inode = file->f_path.dentry->d_inode;
+ struct inode *inode = file_inode(file);
struct btrfs_inode *ip = BTRFS_I(inode);
struct btrfs_root *root = ip->root;
struct btrfs_trans_handle *trans;
@@ -310,7 +310,7 @@ static int btrfs_ioctl_setflags(struct file *file, void __user *arg)
static int btrfs_ioctl_getversion(struct file *file, int __user *arg)
{
- struct inode *inode = file->f_path.dentry->d_inode;
+ struct inode *inode = file_inode(file);
return put_user(inode->i_generation, arg);
}
@@ -363,46 +363,52 @@ static noinline int btrfs_ioctl_fitrim(struct file *file, void __user *arg)
return 0;
}
-static noinline int create_subvol(struct btrfs_root *root,
+static noinline int create_subvol(struct inode *dir,
struct dentry *dentry,
char *name, int namelen,
u64 *async_transid,
- struct btrfs_qgroup_inherit **inherit)
+ struct btrfs_qgroup_inherit *inherit)
{
struct btrfs_trans_handle *trans;
struct btrfs_key key;
struct btrfs_root_item root_item;
struct btrfs_inode_item *inode_item;
struct extent_buffer *leaf;
+ struct btrfs_root *root = BTRFS_I(dir)->root;
struct btrfs_root *new_root;
- struct dentry *parent = dentry->d_parent;
- struct inode *dir;
+ struct btrfs_block_rsv block_rsv;
struct timespec cur_time = CURRENT_TIME;
int ret;
int err;
u64 objectid;
u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID;
u64 index = 0;
+ u64 qgroup_reserved;
uuid_le new_uuid;
ret = btrfs_find_free_objectid(root->fs_info->tree_root, &objectid);
if (ret)
return ret;
- dir = parent->d_inode;
-
+ btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP);
/*
- * 1 - inode item
- * 2 - refs
- * 1 - root item
- * 2 - dir items
+ * The same as the snapshot creation, please see the comment
+ * of create_snapshot().
*/
- trans = btrfs_start_transaction(root, 6);
- if (IS_ERR(trans))
- return PTR_ERR(trans);
+ ret = btrfs_subvolume_reserve_metadata(root, &block_rsv,
+ 7, &qgroup_reserved);
+ if (ret)
+ return ret;
- ret = btrfs_qgroup_inherit(trans, root->fs_info, 0, objectid,
- inherit ? *inherit : NULL);
+ trans = btrfs_start_transaction(root, 0);
+ if (IS_ERR(trans)) {
+ ret = PTR_ERR(trans);
+ goto out;
+ }
+ trans->block_rsv = &block_rsv;
+ trans->bytes_reserved = block_rsv.size;
+
+ ret = btrfs_qgroup_inherit(trans, root->fs_info, 0, objectid, inherit);
if (ret)
goto fail;
@@ -515,8 +521,9 @@ static noinline int create_subvol(struct btrfs_root *root,
BUG_ON(ret);
- d_instantiate(dentry, btrfs_lookup_dentry(dir, dentry));
fail:
+ trans->block_rsv = NULL;
+ trans->bytes_reserved = 0;
if (async_transid) {
*async_transid = trans->transid;
err = btrfs_commit_transaction_async(trans, root, 1);
@@ -525,12 +532,18 @@ fail:
}
if (err && !ret)
ret = err;
+
+ if (!ret)
+ d_instantiate(dentry, btrfs_lookup_dentry(dir, dentry));
+out:
+ btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved);
return ret;
}
-static int create_snapshot(struct btrfs_root *root, struct dentry *dentry,
- char *name, int namelen, u64 *async_transid,
- bool readonly, struct btrfs_qgroup_inherit **inherit)
+static int create_snapshot(struct btrfs_root *root, struct inode *dir,
+ struct dentry *dentry, char *name, int namelen,
+ u64 *async_transid, bool readonly,
+ struct btrfs_qgroup_inherit *inherit)
{
struct inode *inode;
struct btrfs_pending_snapshot *pending_snapshot;
@@ -546,23 +559,31 @@ static int create_snapshot(struct btrfs_root *root, struct dentry *dentry,
btrfs_init_block_rsv(&pending_snapshot->block_rsv,
BTRFS_BLOCK_RSV_TEMP);
+ /*
+ * 1 - parent dir inode
+ * 2 - dir entries
+ * 1 - root item
+ * 2 - root ref/backref
+ * 1 - root of snapshot
+ */
+ ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root,
+ &pending_snapshot->block_rsv, 7,
+ &pending_snapshot->qgroup_reserved);
+ if (ret)
+ goto out;
+
pending_snapshot->dentry = dentry;
pending_snapshot->root = root;
pending_snapshot->readonly = readonly;
- if (inherit) {
- pending_snapshot->inherit = *inherit;
- *inherit = NULL; /* take responsibility to free it */
- }
+ pending_snapshot->dir = dir;
+ pending_snapshot->inherit = inherit;
- trans = btrfs_start_transaction(root->fs_info->extent_root, 6);
+ trans = btrfs_start_transaction(root, 0);
if (IS_ERR(trans)) {
ret = PTR_ERR(trans);
goto fail;
}
- ret = btrfs_snap_reserve_metadata(trans, pending_snapshot);
- BUG_ON(ret);
-
spin_lock(&root->fs_info->trans_lock);
list_add(&pending_snapshot->list,
&trans->transaction->pending_snapshots);
@@ -599,6 +620,10 @@ static int create_snapshot(struct btrfs_root *root, struct dentry *dentry,
d_instantiate(dentry, inode);
ret = 0;
fail:
+ btrfs_subvolume_release_metadata(BTRFS_I(dir)->root,
+ &pending_snapshot->block_rsv,
+ pending_snapshot->qgroup_reserved);
+out:
kfree(pending_snapshot);
return ret;
}
@@ -692,7 +717,7 @@ static noinline int btrfs_mksubvol(struct path *parent,
char *name, int namelen,
struct btrfs_root *snap_src,
u64 *async_transid, bool readonly,
- struct btrfs_qgroup_inherit **inherit)
+ struct btrfs_qgroup_inherit *inherit)
{
struct inode *dir = parent->dentry->d_inode;
struct dentry *dentry;
@@ -729,11 +754,11 @@ static noinline int btrfs_mksubvol(struct path *parent,
goto out_up_read;
if (snap_src) {
- error = create_snapshot(snap_src, dentry, name, namelen,
+ error = create_snapshot(snap_src, dir, dentry, name, namelen,
async_transid, readonly, inherit);
} else {
- error = create_subvol(BTRFS_I(dir)->root, dentry,
- name, namelen, async_transid, inherit);
+ error = create_subvol(dir, dentry, name, namelen,
+ async_transid, inherit);
}
if (!error)
fsnotify_mkdir(dir, dentry);
@@ -815,7 +840,7 @@ static int find_new_extents(struct btrfs_root *root,
while(1) {
ret = btrfs_search_forward(root, &min_key, &max_key,
- path, 0, newer_than);
+ path, newer_than);
if (ret != 0)
goto none;
if (min_key.objectid != ino)
@@ -1203,6 +1228,12 @@ int btrfs_defrag_file(struct inode *inode, struct file *file,
if (!(inode->i_sb->s_flags & MS_ACTIVE))
break;
+ if (btrfs_defrag_cancelled(root->fs_info)) {
+ printk(KERN_DEBUG "btrfs: defrag_file cancelled\n");
+ ret = -EAGAIN;
+ break;
+ }
+
if (!should_defrag_range(inode, (u64)i << PAGE_CACHE_SHIFT,
extent_thresh, &last_len, &skip,
&defrag_end, range->flags &
@@ -1317,7 +1348,7 @@ static noinline int btrfs_ioctl_resize(struct file *file,
u64 new_size;
u64 old_size;
u64 devid = 1;
- struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
+ struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
struct btrfs_ioctl_vol_args *vol_args;
struct btrfs_trans_handle *trans;
struct btrfs_device *device = NULL;
@@ -1326,9 +1357,6 @@ static noinline int btrfs_ioctl_resize(struct file *file,
int ret = 0;
int mod = 0;
- if (root->fs_info->sb->s_flags & MS_RDONLY)
- return -EROFS;
-
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
@@ -1339,7 +1367,8 @@ static noinline int btrfs_ioctl_resize(struct file *file,
if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running,
1)) {
pr_info("btrfs: dev add/delete/balance/replace/resize operation in progress\n");
- return -EINPROGRESS;
+ mnt_drop_write_file(file);
+ return -EINVAL;
}
mutex_lock(&root->fs_info->volume_mutex);
@@ -1359,21 +1388,27 @@ static noinline int btrfs_ioctl_resize(struct file *file,
*devstr = '\0';
devstr = vol_args->name;
devid = simple_strtoull(devstr, &end, 10);
+ if (!devid) {
+ ret = -EINVAL;
+ goto out_free;
+ }
printk(KERN_INFO "btrfs: resizing devid %llu\n",
(unsigned long long)devid);
}
+
device = btrfs_find_device(root->fs_info, devid, NULL, NULL);
if (!device) {
printk(KERN_INFO "btrfs: resizer unable to find device %llu\n",
(unsigned long long)devid);
- ret = -EINVAL;
+ ret = -ENODEV;
goto out_free;
}
- if (device->fs_devices && device->fs_devices->seeding) {
+
+ if (!device->writeable) {
printk(KERN_INFO "btrfs: resizer unable to apply on "
- "seeding device %llu\n",
+ "readonly device %llu\n",
(unsigned long long)devid);
- ret = -EINVAL;
+ ret = -EPERM;
goto out_free;
}
@@ -1395,7 +1430,7 @@ static noinline int btrfs_ioctl_resize(struct file *file,
}
if (device->is_tgtdev_for_dev_replace) {
- ret = -EINVAL;
+ ret = -EPERM;
goto out_free;
}
@@ -1443,15 +1478,15 @@ out_free:
kfree(vol_args);
out:
mutex_unlock(&root->fs_info->volume_mutex);
- mnt_drop_write_file(file);
atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0);
+ mnt_drop_write_file(file);
return ret;
}
static noinline int btrfs_ioctl_snap_create_transid(struct file *file,
char *name, unsigned long fd, int subvol,
u64 *transid, bool readonly,
- struct btrfs_qgroup_inherit **inherit)
+ struct btrfs_qgroup_inherit *inherit)
{
int namelen;
int ret = 0;
@@ -1483,8 +1518,8 @@ static noinline int btrfs_ioctl_snap_create_transid(struct file *file,
goto out_drop_write;
}
- src_inode = src.file->f_path.dentry->d_inode;
- if (src_inode->i_sb != file->f_path.dentry->d_inode->i_sb) {
+ src_inode = file_inode(src.file);
+ if (src_inode->i_sb != file_inode(file)->i_sb) {
printk(KERN_INFO "btrfs: Snapshot src from "
"another FS\n");
ret = -EINVAL;
@@ -1560,7 +1595,7 @@ static noinline int btrfs_ioctl_snap_create_v2(struct file *file,
ret = btrfs_ioctl_snap_create_transid(file, vol_args->name,
vol_args->fd, subvol, ptr,
- readonly, &inherit);
+ readonly, inherit);
if (ret == 0 && ptr &&
copy_to_user(arg +
@@ -1576,7 +1611,7 @@ out:
static noinline int btrfs_ioctl_subvol_getflags(struct file *file,
void __user *arg)
{
- struct inode *inode = fdentry(file)->d_inode;
+ struct inode *inode = file_inode(file);
struct btrfs_root *root = BTRFS_I(inode)->root;
int ret = 0;
u64 flags = 0;
@@ -1598,7 +1633,7 @@ static noinline int btrfs_ioctl_subvol_getflags(struct file *file,
static noinline int btrfs_ioctl_subvol_setflags(struct file *file,
void __user *arg)
{
- struct inode *inode = fdentry(file)->d_inode;
+ struct inode *inode = file_inode(file);
struct btrfs_root *root = BTRFS_I(inode)->root;
struct btrfs_trans_handle *trans;
u64 root_flags;
@@ -1857,7 +1892,7 @@ static noinline int search_ioctl(struct inode *inode,
path->keep_locks = 1;
while(1) {
- ret = btrfs_search_forward(root, &key, &max_key, path, 0,
+ ret = btrfs_search_forward(root, &key, &max_key, path,
sk->min_transid);
if (ret != 0) {
if (ret > 0)
@@ -1892,7 +1927,7 @@ static noinline int btrfs_ioctl_tree_search(struct file *file,
if (IS_ERR(args))
return PTR_ERR(args);
- inode = fdentry(file)->d_inode;
+ inode = file_inode(file);
ret = search_ioctl(inode, args);
if (ret == 0 && copy_to_user(argp, args, sizeof(*args)))
ret = -EFAULT;
@@ -2002,7 +2037,7 @@ static noinline int btrfs_ioctl_ino_lookup(struct file *file,
if (IS_ERR(args))
return PTR_ERR(args);
- inode = fdentry(file)->d_inode;
+ inode = file_inode(file);
if (args->treeid == 0)
args->treeid = BTRFS_I(inode)->root->root_key.objectid;
@@ -2029,6 +2064,8 @@ static noinline int btrfs_ioctl_snap_destroy(struct file *file,
struct btrfs_root *dest = NULL;
struct btrfs_ioctl_vol_args *vol_args;
struct btrfs_trans_handle *trans;
+ struct btrfs_block_rsv block_rsv;
+ u64 qgroup_reserved;
int namelen;
int ret;
int err = 0;
@@ -2095,13 +2132,13 @@ static noinline int btrfs_ioctl_snap_destroy(struct file *file,
err = inode_permission(inode, MAY_WRITE | MAY_EXEC);
if (err)
goto out_dput;
-
- /* check if subvolume may be deleted by a non-root user */
- err = btrfs_may_delete(dir, dentry, 1);
- if (err)
- goto out_dput;
}
+ /* check if subvolume may be deleted by a user */
+ err = btrfs_may_delete(dir, dentry, 1);
+ if (err)
+ goto out_dput;
+
if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) {
err = -EINVAL;
goto out_dput;
@@ -2118,12 +2155,23 @@ static noinline int btrfs_ioctl_snap_destroy(struct file *file,
if (err)
goto out_up_write;
+ btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP);
+ /*
+ * One for dir inode, two for dir entries, two for root
+ * ref/backref.
+ */
+ err = btrfs_subvolume_reserve_metadata(root, &block_rsv,
+ 5, &qgroup_reserved);
+ if (err)
+ goto out_up_write;
+
trans = btrfs_start_transaction(root, 0);
if (IS_ERR(trans)) {
err = PTR_ERR(trans);
- goto out_up_write;
+ goto out_release;
}
- trans->block_rsv = &root->fs_info->global_block_rsv;
+ trans->block_rsv = &block_rsv;
+ trans->bytes_reserved = block_rsv.size;
ret = btrfs_unlink_subvol(trans, root, dir,
dest->root_key.objectid,
@@ -2153,10 +2201,14 @@ static noinline int btrfs_ioctl_snap_destroy(struct file *file,
}
}
out_end_trans:
+ trans->block_rsv = NULL;
+ trans->bytes_reserved = 0;
ret = btrfs_end_transaction(trans, root);
if (ret && !err)
err = ret;
inode->i_flags |= S_DEAD;
+out_release:
+ btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved);
out_up_write:
up_write(&root->fs_info->subvol_sem);
out_unlock:
@@ -2165,6 +2217,12 @@ out_unlock:
shrink_dcache_sb(root->fs_info->sb);
btrfs_invalidate_inodes(dest);
d_delete(dentry);
+
+ /* the last ref */
+ if (dest->cache_inode) {
+ iput(dest->cache_inode);
+ dest->cache_inode = NULL;
+ }
}
out_dput:
dput(dentry);
@@ -2178,24 +2236,25 @@ out:
static int btrfs_ioctl_defrag(struct file *file, void __user *argp)
{
- struct inode *inode = fdentry(file)->d_inode;
+ struct inode *inode = file_inode(file);
struct btrfs_root *root = BTRFS_I(inode)->root;
struct btrfs_ioctl_defrag_range_args *range;
int ret;
- if (btrfs_root_readonly(root))
- return -EROFS;
+ ret = mnt_want_write_file(file);
+ if (ret)
+ return ret;
if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running,
1)) {
pr_info("btrfs: dev add/delete/balance/replace/resize operation in progress\n");
- return -EINPROGRESS;
+ mnt_drop_write_file(file);
+ return -EINVAL;
}
- ret = mnt_want_write_file(file);
- if (ret) {
- atomic_set(&root->fs_info->mutually_exclusive_operation_running,
- 0);
- return ret;
+
+ if (btrfs_root_readonly(root)) {
+ ret = -EROFS;
+ goto out;
}
switch (inode->i_mode & S_IFMT) {
@@ -2204,10 +2263,10 @@ static int btrfs_ioctl_defrag(struct file *file, void __user *argp)
ret = -EPERM;
goto out;
}
- ret = btrfs_defrag_root(root, 0);
+ ret = btrfs_defrag_root(root);
if (ret)
goto out;
- ret = btrfs_defrag_root(root->fs_info->extent_root, 0);
+ ret = btrfs_defrag_root(root->fs_info->extent_root);
break;
case S_IFREG:
if (!(file->f_mode & FMODE_WRITE)) {
@@ -2237,7 +2296,7 @@ static int btrfs_ioctl_defrag(struct file *file, void __user *argp)
/* the rest are all set to zero by kzalloc */
range->len = (u64)-1;
}
- ret = btrfs_defrag_file(fdentry(file)->d_inode, file,
+ ret = btrfs_defrag_file(file_inode(file), file,
range, 0, 0);
if (ret > 0)
ret = 0;
@@ -2247,8 +2306,8 @@ static int btrfs_ioctl_defrag(struct file *file, void __user *argp)
ret = -EINVAL;
}
out:
- mnt_drop_write_file(file);
atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0);
+ mnt_drop_write_file(file);
return ret;
}
@@ -2263,7 +2322,7 @@ static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg)
if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running,
1)) {
pr_info("btrfs: dev add/delete/balance/replace/resize operation in progress\n");
- return -EINPROGRESS;
+ return -EINVAL;
}
mutex_lock(&root->fs_info->volume_mutex);
@@ -2285,7 +2344,7 @@ out:
static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg)
{
- struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
+ struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
struct btrfs_ioctl_vol_args *vol_args;
int ret;
@@ -2300,7 +2359,7 @@ static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg)
1)) {
pr_info("btrfs: dev add/delete/balance/replace/resize operation in progress\n");
mnt_drop_write_file(file);
- return -EINPROGRESS;
+ return -EINVAL;
}
mutex_lock(&root->fs_info->volume_mutex);
@@ -2316,8 +2375,8 @@ static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg)
kfree(vol_args);
out:
mutex_unlock(&root->fs_info->volume_mutex);
- mnt_drop_write_file(file);
atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0);
+ mnt_drop_write_file(file);
return ret;
}
@@ -2408,7 +2467,7 @@ out:
static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd,
u64 off, u64 olen, u64 destoff)
{
- struct inode *inode = fdentry(file)->d_inode;
+ struct inode *inode = file_inode(file);
struct btrfs_root *root = BTRFS_I(inode)->root;
struct fd src_file;
struct inode *src;
@@ -2454,7 +2513,7 @@ static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd,
if (src_file.file->f_path.mnt != file->f_path.mnt)
goto out_fput;
- src = src_file.file->f_dentry->d_inode;
+ src = file_inode(src_file.file);
ret = -EINVAL;
if (src == inode)
@@ -2816,7 +2875,7 @@ static long btrfs_ioctl_clone_range(struct file *file, void __user *argp)
*/
static long btrfs_ioctl_trans_start(struct file *file)
{
- struct inode *inode = fdentry(file)->d_inode;
+ struct inode *inode = file_inode(file);
struct btrfs_root *root = BTRFS_I(inode)->root;
struct btrfs_trans_handle *trans;
int ret;
@@ -2856,7 +2915,7 @@ out:
static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp)
{
- struct inode *inode = fdentry(file)->d_inode;
+ struct inode *inode = file_inode(file);
struct btrfs_root *root = BTRFS_I(inode)->root;
struct btrfs_root *new_root;
struct btrfs_dir_item *di;
@@ -3080,7 +3139,7 @@ out:
*/
long btrfs_ioctl_trans_end(struct file *file)
{
- struct inode *inode = fdentry(file)->d_inode;
+ struct inode *inode = file_inode(file);
struct btrfs_root *root = BTRFS_I(inode)->root;
struct btrfs_trans_handle *trans;
@@ -3104,7 +3163,7 @@ static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root,
u64 transid;
int ret;
- trans = btrfs_attach_transaction(root);
+ trans = btrfs_attach_transaction_barrier(root);
if (IS_ERR(trans)) {
if (PTR_ERR(trans) != -ENOENT)
return PTR_ERR(trans);
@@ -3142,7 +3201,7 @@ static noinline long btrfs_ioctl_wait_sync(struct btrfs_root *root,
static long btrfs_ioctl_scrub(struct file *file, void __user *arg)
{
- struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
+ struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
struct btrfs_ioctl_scrub_args *sa;
int ret;
@@ -3282,7 +3341,7 @@ static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg)
struct inode_fs_paths *ipath = NULL;
struct btrfs_path *path;
- if (!capable(CAP_SYS_ADMIN))
+ if (!capable(CAP_DAC_READ_SEARCH))
return -EPERM;
path = btrfs_alloc_path();
@@ -3433,12 +3492,12 @@ void update_ioctl_balance_args(struct btrfs_fs_info *fs_info, int lock,
static long btrfs_ioctl_balance(struct file *file, void __user *arg)
{
- struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
+ struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
struct btrfs_fs_info *fs_info = root->fs_info;
struct btrfs_ioctl_balance_args *bargs;
struct btrfs_balance_control *bctl;
+ bool need_unlock; /* for mut. excl. ops lock */
int ret;
- int need_to_clear_lock = 0;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
@@ -3447,14 +3506,61 @@ static long btrfs_ioctl_balance(struct file *file, void __user *arg)
if (ret)
return ret;
- mutex_lock(&fs_info->volume_mutex);
+again:
+ if (!atomic_xchg(&fs_info->mutually_exclusive_operation_running, 1)) {
+ mutex_lock(&fs_info->volume_mutex);
+ mutex_lock(&fs_info->balance_mutex);
+ need_unlock = true;
+ goto locked;
+ }
+
+ /*
+ * mut. excl. ops lock is locked. Three possibilites:
+ * (1) some other op is running
+ * (2) balance is running
+ * (3) balance is paused -- special case (think resume)
+ */
mutex_lock(&fs_info->balance_mutex);
+ if (fs_info->balance_ctl) {
+ /* this is either (2) or (3) */
+ if (!atomic_read(&fs_info->balance_running)) {
+ mutex_unlock(&fs_info->balance_mutex);
+ if (!mutex_trylock(&fs_info->volume_mutex))
+ goto again;
+ mutex_lock(&fs_info->balance_mutex);
+
+ if (fs_info->balance_ctl &&
+ !atomic_read(&fs_info->balance_running)) {
+ /* this is (3) */
+ need_unlock = false;
+ goto locked;
+ }
+
+ mutex_unlock(&fs_info->balance_mutex);
+ mutex_unlock(&fs_info->volume_mutex);
+ goto again;
+ } else {
+ /* this is (2) */
+ mutex_unlock(&fs_info->balance_mutex);
+ ret = -EINPROGRESS;
+ goto out;
+ }
+ } else {
+ /* this is (1) */
+ mutex_unlock(&fs_info->balance_mutex);
+ pr_info("btrfs: dev add/delete/balance/replace/resize operation in progress\n");
+ ret = -EINVAL;
+ goto out;
+ }
+
+locked:
+ BUG_ON(!atomic_read(&fs_info->mutually_exclusive_operation_running));
if (arg) {
bargs = memdup_user(arg, sizeof(*bargs));
if (IS_ERR(bargs)) {
ret = PTR_ERR(bargs);
- goto out;
+ goto out_unlock;
}
if (bargs->flags & BTRFS_BALANCE_RESUME) {
@@ -3474,13 +3580,10 @@ static long btrfs_ioctl_balance(struct file *file, void __user *arg)
bargs = NULL;
}
- if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running,
- 1)) {
- pr_info("btrfs: dev add/delete/balance/replace/resize operation in progress\n");
+ if (fs_info->balance_ctl) {
ret = -EINPROGRESS;
goto out_bargs;
}
- need_to_clear_lock = 1;
bctl = kzalloc(sizeof(*bctl), GFP_NOFS);
if (!bctl) {
@@ -3501,11 +3604,17 @@ static long btrfs_ioctl_balance(struct file *file, void __user *arg)
}
do_balance:
- ret = btrfs_balance(bctl, bargs);
/*
- * bctl is freed in __cancel_balance or in free_fs_info if
- * restriper was paused all the way until unmount
+ * Ownership of bctl and mutually_exclusive_operation_running
+ * goes to to btrfs_balance. bctl is freed in __cancel_balance,
+ * or, if restriper was paused all the way until unmount, in
+ * free_fs_info. mutually_exclusive_operation_running is
+ * cleared in __cancel_balance.
*/
+ need_unlock = false;
+
+ ret = btrfs_balance(bctl, bargs);
+
if (arg) {
if (copy_to_user(arg, bargs, sizeof(*bargs)))
ret = -EFAULT;
@@ -3513,12 +3622,12 @@ do_balance:
out_bargs:
kfree(bargs);
-out:
- if (need_to_clear_lock)
- atomic_set(&root->fs_info->mutually_exclusive_operation_running,
- 0);
+out_unlock:
mutex_unlock(&fs_info->balance_mutex);
mutex_unlock(&fs_info->volume_mutex);
+ if (need_unlock)
+ atomic_set(&fs_info->mutually_exclusive_operation_running, 0);
+out:
mnt_drop_write_file(file);
return ret;
}
@@ -3573,7 +3682,7 @@ out:
static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg)
{
- struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
+ struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
struct btrfs_ioctl_quota_ctl_args *sa;
struct btrfs_trans_handle *trans = NULL;
int ret;
@@ -3632,7 +3741,7 @@ drop_write:
static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg)
{
- struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
+ struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
struct btrfs_ioctl_qgroup_assign_args *sa;
struct btrfs_trans_handle *trans;
int ret;
@@ -3679,7 +3788,7 @@ drop_write:
static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg)
{
- struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
+ struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
struct btrfs_ioctl_qgroup_create_args *sa;
struct btrfs_trans_handle *trans;
int ret;
@@ -3698,6 +3807,11 @@ static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg)
goto drop_write;
}
+ if (!sa->qgroupid) {
+ ret = -EINVAL;
+ goto out;
+ }
+
trans = btrfs_join_transaction(root);
if (IS_ERR(trans)) {
ret = PTR_ERR(trans);
@@ -3725,7 +3839,7 @@ drop_write:
static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg)
{
- struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
+ struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
struct btrfs_ioctl_qgroup_limit_args *sa;
struct btrfs_trans_handle *trans;
int ret;
@@ -3775,7 +3889,7 @@ static long btrfs_ioctl_set_received_subvol(struct file *file,
void __user *arg)
{
struct btrfs_ioctl_received_subvol_args *sa = NULL;
- struct inode *inode = fdentry(file)->d_inode;
+ struct inode *inode = file_inode(file);
struct btrfs_root *root = BTRFS_I(inode)->root;
struct btrfs_root_item *root_item = &root->root_item;
struct btrfs_trans_handle *trans;
@@ -3852,10 +3966,69 @@ out:
return ret;
}
+static int btrfs_ioctl_get_fslabel(struct file *file, void __user *arg)
+{
+ struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
+ const char *label = root->fs_info->super_copy->label;
+ size_t len = strnlen(label, BTRFS_LABEL_SIZE);
+ int ret;
+
+ if (len == BTRFS_LABEL_SIZE) {
+ pr_warn("btrfs: label is too long, return the first %zu bytes\n",
+ --len);
+ }
+
+ mutex_lock(&root->fs_info->volume_mutex);
+ ret = copy_to_user(arg, label, len);
+ mutex_unlock(&root->fs_info->volume_mutex);
+
+ return ret ? -EFAULT : 0;
+}
+
+static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg)
+{
+ struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
+ struct btrfs_super_block *super_block = root->fs_info->super_copy;
+ struct btrfs_trans_handle *trans;
+ char label[BTRFS_LABEL_SIZE];
+ int ret;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ if (copy_from_user(label, arg, sizeof(label)))
+ return -EFAULT;
+
+ if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) {
+ pr_err("btrfs: unable to set label with more than %d bytes\n",
+ BTRFS_LABEL_SIZE - 1);
+ return -EINVAL;
+ }
+
+ ret = mnt_want_write_file(file);
+ if (ret)
+ return ret;
+
+ mutex_lock(&root->fs_info->volume_mutex);
+ trans = btrfs_start_transaction(root, 0);
+ if (IS_ERR(trans)) {
+ ret = PTR_ERR(trans);
+ goto out_unlock;
+ }
+
+ strcpy(super_block->label, label);
+ ret = btrfs_end_transaction(trans, root);
+
+out_unlock:
+ mutex_unlock(&root->fs_info->volume_mutex);
+ mnt_drop_write_file(file);
+ return ret;
+}
+
long btrfs_ioctl(struct file *file, unsigned int
cmd, unsigned long arg)
{
- struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
+ struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
void __user *argp = (void __user *)arg;
switch (cmd) {
@@ -3952,6 +4125,10 @@ long btrfs_ioctl(struct file *file, unsigned int
return btrfs_ioctl_qgroup_limit(file, argp);
case BTRFS_IOC_DEV_REPLACE:
return btrfs_ioctl_dev_replace(root, argp);
+ case BTRFS_IOC_GET_FSLABEL:
+ return btrfs_ioctl_get_fslabel(file, argp);
+ case BTRFS_IOC_SET_FSLABEL:
+ return btrfs_ioctl_set_fslabel(file, argp);
}
return -ENOTTY;
generated by cgit v1.2.3 (git 2.51.0) at 2025-09-20 22:42:28 +0000