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Diffstat (limited to 'fs/btrfs/ioctl.c')
-rw-r--r--fs/btrfs/ioctl.c976
1 files changed, 757 insertions, 219 deletions
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 0e92e576300..338f2597bf7 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -41,6 +41,7 @@
#include <linux/vmalloc.h>
#include <linux/slab.h>
#include <linux/blkdev.h>
+#include <linux/uuid.h>
#include "compat.h"
#include "ctree.h"
#include "disk-io.h"
@@ -53,6 +54,8 @@
#include "inode-map.h"
#include "backref.h"
#include "rcu-string.h"
+#include "send.h"
+#include "dev-replace.h"
/* Mask out flags that are inappropriate for the given type of inode. */
static inline __u32 btrfs_mask_flags(umode_t mode, __u32 flags)
@@ -138,8 +141,11 @@ void btrfs_inherit_iflags(struct inode *inode, struct inode *dir)
BTRFS_I(inode)->flags |= BTRFS_INODE_COMPRESS;
}
- if (flags & BTRFS_INODE_NODATACOW)
+ if (flags & BTRFS_INODE_NODATACOW) {
BTRFS_I(inode)->flags |= BTRFS_INODE_NODATACOW;
+ if (S_ISREG(inode->i_mode))
+ BTRFS_I(inode)->flags |= BTRFS_INODE_NODATASUM;
+ }
btrfs_update_iflags(inode);
}
@@ -179,6 +185,7 @@ static int btrfs_ioctl_setflags(struct file *file, void __user *arg)
int ret;
u64 ip_oldflags;
unsigned int i_oldflags;
+ umode_t mode;
if (btrfs_root_readonly(root))
return -EROFS;
@@ -193,10 +200,15 @@ static int btrfs_ioctl_setflags(struct file *file, void __user *arg)
if (!inode_owner_or_capable(inode))
return -EACCES;
+ ret = mnt_want_write_file(file);
+ if (ret)
+ return ret;
+
mutex_lock(&inode->i_mutex);
ip_oldflags = ip->flags;
i_oldflags = inode->i_flags;
+ mode = inode->i_mode;
flags = btrfs_mask_flags(inode->i_mode, flags);
oldflags = btrfs_flags_to_ioctl(ip->flags);
@@ -207,10 +219,6 @@ static int btrfs_ioctl_setflags(struct file *file, void __user *arg)
}
}
- ret = mnt_want_write_file(file);
- if (ret)
- goto out_unlock;
-
if (flags & FS_SYNC_FL)
ip->flags |= BTRFS_INODE_SYNC;
else
@@ -235,10 +243,31 @@ static int btrfs_ioctl_setflags(struct file *file, void __user *arg)
ip->flags |= BTRFS_INODE_DIRSYNC;
else
ip->flags &= ~BTRFS_INODE_DIRSYNC;
- if (flags & FS_NOCOW_FL)
- ip->flags |= BTRFS_INODE_NODATACOW;
- else
- ip->flags &= ~BTRFS_INODE_NODATACOW;
+ if (flags & FS_NOCOW_FL) {
+ if (S_ISREG(mode)) {
+ /*
+ * It's safe to turn csums off here, no extents exist.
+ * Otherwise we want the flag to reflect the real COW
+ * status of the file and will not set it.
+ */
+ if (inode->i_size == 0)
+ ip->flags |= BTRFS_INODE_NODATACOW
+ | BTRFS_INODE_NODATASUM;
+ } else {
+ ip->flags |= BTRFS_INODE_NODATACOW;
+ }
+ } else {
+ /*
+ * Revert back under same assuptions as above
+ */
+ if (S_ISREG(mode)) {
+ if (inode->i_size == 0)
+ ip->flags &= ~(BTRFS_INODE_NODATACOW
+ | BTRFS_INODE_NODATASUM);
+ } else {
+ ip->flags &= ~BTRFS_INODE_NODATACOW;
+ }
+ }
/*
* The COMPRESS flag can only be changed by users, while the NOCOMPRESS
@@ -273,9 +302,9 @@ static int btrfs_ioctl_setflags(struct file *file, void __user *arg)
inode->i_flags = i_oldflags;
}
- mnt_drop_write_file(file);
out_unlock:
mutex_unlock(&inode->i_mutex);
+ mnt_drop_write_file(file);
return ret;
}
@@ -318,7 +347,8 @@ static noinline int btrfs_ioctl_fitrim(struct file *file, void __user *arg)
return -EOPNOTSUPP;
if (copy_from_user(&range, arg, sizeof(range)))
return -EFAULT;
- if (range.start > total_bytes)
+ if (range.start > total_bytes ||
+ range.len < fs_info->sb->s_blocksize)
return -EINVAL;
range.len = min(range.len, total_bytes - range.start);
@@ -336,7 +366,8 @@ static noinline int btrfs_ioctl_fitrim(struct file *file, void __user *arg)
static noinline int create_subvol(struct btrfs_root *root,
struct dentry *dentry,
char *name, int namelen,
- u64 *async_transid)
+ u64 *async_transid,
+ struct btrfs_qgroup_inherit **inherit)
{
struct btrfs_trans_handle *trans;
struct btrfs_key key;
@@ -346,11 +377,13 @@ static noinline int create_subvol(struct btrfs_root *root,
struct btrfs_root *new_root;
struct dentry *parent = dentry->d_parent;
struct inode *dir;
+ struct timespec cur_time = CURRENT_TIME;
int ret;
int err;
u64 objectid;
u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID;
u64 index = 0;
+ uuid_le new_uuid;
ret = btrfs_find_free_objectid(root->fs_info->tree_root, &objectid);
if (ret)
@@ -368,6 +401,11 @@ static noinline int create_subvol(struct btrfs_root *root,
if (IS_ERR(trans))
return PTR_ERR(trans);
+ ret = btrfs_qgroup_inherit(trans, root->fs_info, 0, objectid,
+ inherit ? *inherit : NULL);
+ if (ret)
+ goto fail;
+
leaf = btrfs_alloc_free_block(trans, root, root->leafsize,
0, objectid, NULL, 0, 0, 0);
if (IS_ERR(leaf)) {
@@ -389,8 +427,9 @@ static noinline int create_subvol(struct btrfs_root *root,
BTRFS_UUID_SIZE);
btrfs_mark_buffer_dirty(leaf);
+ memset(&root_item, 0, sizeof(root_item));
+
inode_item = &root_item.inode;
- memset(inode_item, 0, sizeof(*inode_item));
inode_item->generation = cpu_to_le64(1);
inode_item->size = cpu_to_le64(3);
inode_item->nlink = cpu_to_le32(1);
@@ -408,8 +447,15 @@ static noinline int create_subvol(struct btrfs_root *root,
btrfs_set_root_used(&root_item, leaf->len);
btrfs_set_root_last_snapshot(&root_item, 0);
- memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress));
- root_item.drop_level = 0;
+ btrfs_set_root_generation_v2(&root_item,
+ btrfs_root_generation(&root_item));
+ uuid_le_gen(&new_uuid);
+ memcpy(root_item.uuid, new_uuid.b, BTRFS_UUID_SIZE);
+ root_item.otime.sec = cpu_to_le64(cur_time.tv_sec);
+ root_item.otime.nsec = cpu_to_le32(cur_time.tv_nsec);
+ root_item.ctime = root_item.otime;
+ btrfs_set_root_ctransid(&root_item, trans->transid);
+ btrfs_set_root_otransid(&root_item, trans->transid);
btrfs_tree_unlock(leaf);
free_extent_buffer(leaf);
@@ -469,7 +515,6 @@ static noinline int create_subvol(struct btrfs_root *root,
BUG_ON(ret);
- d_instantiate(dentry, btrfs_lookup_dentry(dir, dentry));
fail:
if (async_transid) {
*async_transid = trans->transid;
@@ -479,12 +524,16 @@ fail:
}
if (err && !ret)
ret = err;
+
+ if (!ret)
+ d_instantiate(dentry, btrfs_lookup_dentry(dir, dentry));
+
return ret;
}
static int create_snapshot(struct btrfs_root *root, struct dentry *dentry,
char *name, int namelen, u64 *async_transid,
- bool readonly)
+ bool readonly, struct btrfs_qgroup_inherit **inherit)
{
struct inode *inode;
struct btrfs_pending_snapshot *pending_snapshot;
@@ -498,12 +547,17 @@ static int create_snapshot(struct btrfs_root *root, struct dentry *dentry,
if (!pending_snapshot)
return -ENOMEM;
- btrfs_init_block_rsv(&pending_snapshot->block_rsv);
+ btrfs_init_block_rsv(&pending_snapshot->block_rsv,
+ BTRFS_BLOCK_RSV_TEMP);
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 */
+ }
- trans = btrfs_start_transaction(root->fs_info->extent_root, 5);
+ trans = btrfs_start_transaction(root->fs_info->extent_root, 6);
if (IS_ERR(trans)) {
ret = PTR_ERR(trans);
goto fail;
@@ -524,7 +578,12 @@ static int create_snapshot(struct btrfs_root *root, struct dentry *dentry,
ret = btrfs_commit_transaction(trans,
root->fs_info->extent_root);
}
- BUG_ON(ret);
+ if (ret) {
+ /* cleanup_transaction has freed this for us */
+ if (trans->aborted)
+ pending_snapshot = NULL;
+ goto fail;
+ }
ret = pending_snapshot->error;
if (ret)
@@ -553,13 +612,13 @@ fail:
*/
static inline int btrfs_check_sticky(struct inode *dir, struct inode *inode)
{
- uid_t fsuid = current_fsuid();
+ kuid_t fsuid = current_fsuid();
if (!(dir->i_mode & S_ISVTX))
return 0;
- if (inode->i_uid == fsuid)
+ if (uid_eq(inode->i_uid, fsuid))
return 0;
- if (dir->i_uid == fsuid)
+ if (uid_eq(dir->i_uid, fsuid))
return 0;
return !capable(CAP_FOWNER);
}
@@ -592,7 +651,7 @@ static int btrfs_may_delete(struct inode *dir,struct dentry *victim,int isdir)
return -ENOENT;
BUG_ON(victim->d_parent->d_inode != dir);
- audit_inode_child(victim, dir);
+ audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE);
error = inode_permission(dir, MAY_WRITE | MAY_EXEC);
if (error)
@@ -635,7 +694,8 @@ static inline int btrfs_may_create(struct inode *dir, struct dentry *child)
static noinline int btrfs_mksubvol(struct path *parent,
char *name, int namelen,
struct btrfs_root *snap_src,
- u64 *async_transid, bool readonly)
+ u64 *async_transid, bool readonly,
+ struct btrfs_qgroup_inherit **inherit)
{
struct inode *dir = parent->dentry->d_inode;
struct dentry *dentry;
@@ -652,13 +712,19 @@ static noinline int btrfs_mksubvol(struct path *parent,
if (dentry->d_inode)
goto out_dput;
- error = mnt_want_write(parent->mnt);
+ error = btrfs_may_create(dir, dentry);
if (error)
goto out_dput;
- error = btrfs_may_create(dir, dentry);
+ /*
+ * even if this name doesn't exist, we may get hash collisions.
+ * check for them now when we can safely fail
+ */
+ error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root,
+ dir->i_ino, name,
+ namelen);
if (error)
- goto out_drop_write;
+ goto out_dput;
down_read(&BTRFS_I(dir)->root->fs_info->subvol_sem);
@@ -666,18 +732,16 @@ static noinline int btrfs_mksubvol(struct path *parent,
goto out_up_read;
if (snap_src) {
- error = create_snapshot(snap_src, dentry,
- name, namelen, async_transid, readonly);
+ error = create_snapshot(snap_src, dentry, name, namelen,
+ async_transid, readonly, inherit);
} else {
error = create_subvol(BTRFS_I(dir)->root, dentry,
- name, namelen, async_transid);
+ name, namelen, async_transid, inherit);
}
if (!error)
fsnotify_mkdir(dir, dentry);
out_up_read:
up_read(&BTRFS_I(dir)->root->fs_info->subvol_sem);
-out_drop_write:
- mnt_drop_write(parent->mnt);
out_dput:
dput(dentry);
out_unlock:
@@ -832,7 +896,8 @@ static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em)
}
static int should_defrag_range(struct inode *inode, u64 start, int thresh,
- u64 *last_len, u64 *skip, u64 *defrag_end)
+ u64 *last_len, u64 *skip, u64 *defrag_end,
+ int compress)
{
struct extent_map *em;
int ret = 1;
@@ -863,7 +928,7 @@ static int should_defrag_range(struct inode *inode, u64 start, int thresh,
* we hit a real extent, if it is big or the next extent is not a
* real extent, don't bother defragging it
*/
- if ((*last_len == 0 || *last_len >= thresh) &&
+ if (!compress && (*last_len == 0 || *last_len >= thresh) &&
(em->len >= thresh || !next_mergeable))
ret = 0;
out:
@@ -1004,8 +1069,8 @@ again:
page_start, page_end - 1, 0, &cached_state);
clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start,
page_end - 1, EXTENT_DIRTY | EXTENT_DELALLOC |
- EXTENT_DO_ACCOUNTING, 0, 0, &cached_state,
- GFP_NOFS);
+ EXTENT_DO_ACCOUNTING | EXTENT_DEFRAG, 0, 0,
+ &cached_state, GFP_NOFS);
if (i_done != page_cnt) {
spin_lock(&BTRFS_I(inode)->lock);
@@ -1016,8 +1081,8 @@ again:
}
- btrfs_set_extent_delalloc(inode, page_start, page_end - 1,
- &cached_state);
+ set_extent_defrag(&BTRFS_I(inode)->io_tree, page_start, page_end - 1,
+ &cached_state, GFP_NOFS);
unlock_extent_cached(&BTRFS_I(inode)->io_tree,
page_start, page_end - 1, &cached_state,
@@ -1047,11 +1112,9 @@ int btrfs_defrag_file(struct inode *inode, struct file *file,
u64 newer_than, unsigned long max_to_defrag)
{
struct btrfs_root *root = BTRFS_I(inode)->root;
- struct btrfs_super_block *disk_super;
struct file_ra_state *ra = NULL;
unsigned long last_index;
u64 isize = i_size_read(inode);
- u64 features;
u64 last_len = 0;
u64 skip = 0;
u64 defrag_end = 0;
@@ -1145,7 +1208,8 @@ int btrfs_defrag_file(struct inode *inode, struct file *file,
if (!should_defrag_range(inode, (u64)i << PAGE_CACHE_SHIFT,
extent_thresh, &last_len, &skip,
- &defrag_end)) {
+ &defrag_end, range->flags &
+ BTRFS_DEFRAG_RANGE_COMPRESS)) {
unsigned long next;
/*
* the should_defrag function tells us how much to skip
@@ -1182,7 +1246,7 @@ int btrfs_defrag_file(struct inode *inode, struct file *file,
}
defrag_count += ret;
- balance_dirty_pages_ratelimited_nr(inode->i_mapping, ret);
+ balance_dirty_pages_ratelimited(inode->i_mapping);
mutex_unlock(&inode->i_mutex);
if (newer_than) {
@@ -1237,11 +1301,8 @@ int btrfs_defrag_file(struct inode *inode, struct file *file,
mutex_unlock(&inode->i_mutex);
}
- disk_super = root->fs_info->super_copy;
- features = btrfs_super_incompat_flags(disk_super);
if (range->compress_type == BTRFS_COMPRESS_LZO) {
- features |= BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO;
- btrfs_set_super_incompat_flags(disk_super, features);
+ btrfs_set_fs_incompat(root->fs_info, COMPRESS_LZO);
}
ret = defrag_count;
@@ -1253,12 +1314,13 @@ out_ra:
return ret;
}
-static noinline int btrfs_ioctl_resize(struct btrfs_root *root,
+static noinline int btrfs_ioctl_resize(struct file *file,
void __user *arg)
{
u64 new_size;
u64 old_size;
u64 devid = 1;
+ struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
struct btrfs_ioctl_vol_args *vol_args;
struct btrfs_trans_handle *trans;
struct btrfs_device *device = NULL;
@@ -1273,13 +1335,18 @@ static noinline int btrfs_ioctl_resize(struct btrfs_root *root,
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
- mutex_lock(&root->fs_info->volume_mutex);
- if (root->fs_info->balance_ctl) {
- printk(KERN_INFO "btrfs: balance in progress\n");
- ret = -EINVAL;
- goto out;
+ 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");
+ mnt_drop_write_file(file);
+ return -EINVAL;
}
+ mutex_lock(&root->fs_info->volume_mutex);
vol_args = memdup_user(arg, sizeof(*vol_args));
if (IS_ERR(vol_args)) {
ret = PTR_ERR(vol_args);
@@ -1299,16 +1366,18 @@ static noinline int btrfs_ioctl_resize(struct btrfs_root *root,
printk(KERN_INFO "btrfs: resizing devid %llu\n",
(unsigned long long)devid);
}
- device = btrfs_find_device(root, devid, NULL, NULL);
+
+ 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;
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;
goto out_free;
@@ -1331,6 +1400,11 @@ static noinline int btrfs_ioctl_resize(struct btrfs_root *root,
}
}
+ if (device->is_tgtdev_for_dev_replace) {
+ ret = -EINVAL;
+ goto out_free;
+ }
+
old_size = device->total_bytes;
if (mod < 0) {
@@ -1369,66 +1443,66 @@ static noinline int btrfs_ioctl_resize(struct btrfs_root *root,
btrfs_commit_transaction(trans, root);
} else if (new_size < old_size) {
ret = btrfs_shrink_device(device, new_size);
- }
+ } /* equal, nothing need to do */
out_free:
kfree(vol_args);
out:
mutex_unlock(&root->fs_info->volume_mutex);
+ 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)
+ char *name, unsigned long fd, int subvol,
+ u64 *transid, bool readonly,
+ struct btrfs_qgroup_inherit **inherit)
{
- struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
- struct file *src_file;
int namelen;
int ret = 0;
- if (root->fs_info->sb->s_flags & MS_RDONLY)
- return -EROFS;
+ ret = mnt_want_write_file(file);
+ if (ret)
+ goto out;
namelen = strlen(name);
if (strchr(name, '/')) {
ret = -EINVAL;
- goto out;
+ goto out_drop_write;
}
if (name[0] == '.' &&
(namelen == 1 || (name[1] == '.' && namelen == 2))) {
ret = -EEXIST;
- goto out;
+ goto out_drop_write;
}
if (subvol) {
ret = btrfs_mksubvol(&file->f_path, name, namelen,
- NULL, transid, readonly);
+ NULL, transid, readonly, inherit);
} else {
+ struct fd src = fdget(fd);
struct inode *src_inode;
- src_file = fget(fd);
- if (!src_file) {
+ if (!src.file) {
ret = -EINVAL;
- goto out;
+ goto out_drop_write;
}
- src_inode = src_file->f_path.dentry->d_inode;
+ src_inode = src.file->f_path.dentry->d_inode;
if (src_inode->i_sb != file->f_path.dentry->d_inode->i_sb) {
printk(KERN_INFO "btrfs: Snapshot src from "
"another FS\n");
ret = -EINVAL;
- fput(src_file);
- goto out;
+ } else {
+ ret = btrfs_mksubvol(&file->f_path, name, namelen,
+ BTRFS_I(src_inode)->root,
+ transid, readonly, inherit);
}
- ret = btrfs_mksubvol(&file->f_path, name, namelen,
- BTRFS_I(src_inode)->root,
- transid, readonly);
- fput(src_file);
+ fdput(src);
}
+out_drop_write:
+ mnt_drop_write_file(file);
out:
return ret;
}
@@ -1446,7 +1520,7 @@ static noinline int btrfs_ioctl_snap_create(struct file *file,
ret = btrfs_ioctl_snap_create_transid(file, vol_args->name,
vol_args->fd, subvol,
- NULL, false);
+ NULL, false, NULL);
kfree(vol_args);
return ret;
@@ -1460,6 +1534,7 @@ static noinline int btrfs_ioctl_snap_create_v2(struct file *file,
u64 transid = 0;
u64 *ptr = NULL;
bool readonly = false;
+ struct btrfs_qgroup_inherit *inherit = NULL;
vol_args = memdup_user(arg, sizeof(*vol_args));
if (IS_ERR(vol_args))
@@ -1467,7 +1542,8 @@ static noinline int btrfs_ioctl_snap_create_v2(struct file *file,
vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0';
if (vol_args->flags &
- ~(BTRFS_SUBVOL_CREATE_ASYNC | BTRFS_SUBVOL_RDONLY)) {
+ ~(BTRFS_SUBVOL_CREATE_ASYNC | BTRFS_SUBVOL_RDONLY |
+ BTRFS_SUBVOL_QGROUP_INHERIT)) {
ret = -EOPNOTSUPP;
goto out;
}
@@ -1476,10 +1552,21 @@ static noinline int btrfs_ioctl_snap_create_v2(struct file *file,
ptr = &transid;
if (vol_args->flags & BTRFS_SUBVOL_RDONLY)
readonly = true;
+ if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) {
+ if (vol_args->size > PAGE_CACHE_SIZE) {
+ ret = -EINVAL;
+ goto out;
+ }
+ inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size);
+ if (IS_ERR(inherit)) {
+ ret = PTR_ERR(inherit);
+ goto out;
+ }
+ }
ret = btrfs_ioctl_snap_create_transid(file, vol_args->name,
- vol_args->fd, subvol,
- ptr, readonly);
+ vol_args->fd, subvol, ptr,
+ readonly, &inherit);
if (ret == 0 && ptr &&
copy_to_user(arg +
@@ -1488,6 +1575,7 @@ static noinline int btrfs_ioctl_snap_create_v2(struct file *file,
ret = -EFAULT;
out:
kfree(vol_args);
+ kfree(inherit);
return ret;
}
@@ -1523,29 +1611,40 @@ static noinline int btrfs_ioctl_subvol_setflags(struct file *file,
u64 flags;
int ret = 0;
- if (root->fs_info->sb->s_flags & MS_RDONLY)
- return -EROFS;
+ ret = mnt_want_write_file(file);
+ if (ret)
+ goto out;
- if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID)
- return -EINVAL;
+ if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) {
+ ret = -EINVAL;
+ goto out_drop_write;
+ }
- if (copy_from_user(&flags, arg, sizeof(flags)))
- return -EFAULT;
+ if (copy_from_user(&flags, arg, sizeof(flags))) {
+ ret = -EFAULT;
+ goto out_drop_write;
+ }
- if (flags & BTRFS_SUBVOL_CREATE_ASYNC)
- return -EINVAL;
+ if (flags & BTRFS_SUBVOL_CREATE_ASYNC) {
+ ret = -EINVAL;
+ goto out_drop_write;
+ }
- if (flags & ~BTRFS_SUBVOL_RDONLY)
- return -EOPNOTSUPP;
+ if (flags & ~BTRFS_SUBVOL_RDONLY) {
+ ret = -EOPNOTSUPP;
+ goto out_drop_write;
+ }
- if (!inode_owner_or_capable(inode))
- return -EACCES;
+ if (!inode_owner_or_capable(inode)) {
+ ret = -EACCES;
+ goto out_drop_write;
+ }
down_write(&root->fs_info->subvol_sem);
/* nothing to do */
if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root))
- goto out;
+ goto out_drop_sem;
root_flags = btrfs_root_flags(&root->root_item);
if (flags & BTRFS_SUBVOL_RDONLY)
@@ -1568,8 +1667,11 @@ static noinline int btrfs_ioctl_subvol_setflags(struct file *file,
out_reset:
if (ret)
btrfs_set_root_flags(&root->root_item, root_flags);
-out:
+out_drop_sem:
up_write(&root->fs_info->subvol_sem);
+out_drop_write:
+ mnt_drop_write_file(file);
+out:
return ret;
}
@@ -1999,13 +2101,13 @@ 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;
@@ -2087,13 +2189,22 @@ static int btrfs_ioctl_defrag(struct file *file, void __user *argp)
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");
+ mnt_drop_write_file(file);
+ return -EINVAL;
+ }
+
+ if (btrfs_root_readonly(root)) {
+ ret = -EROFS;
+ goto out;
+ }
+
switch (inode->i_mode & S_IFMT) {
case S_IFDIR:
if (!capable(CAP_SYS_ADMIN)) {
@@ -2143,6 +2254,7 @@ static int btrfs_ioctl_defrag(struct file *file, void __user *argp)
ret = -EINVAL;
}
out:
+ atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0);
mnt_drop_write_file(file);
return ret;
}
@@ -2155,13 +2267,13 @@ static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg)
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
- mutex_lock(&root->fs_info->volume_mutex);
- if (root->fs_info->balance_ctl) {
- printk(KERN_INFO "btrfs: balance in progress\n");
- ret = -EINVAL;
- goto out;
+ 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 -EINVAL;
}
+ mutex_lock(&root->fs_info->volume_mutex);
vol_args = memdup_user(arg, sizeof(*vol_args));
if (IS_ERR(vol_args)) {
ret = PTR_ERR(vol_args);
@@ -2174,27 +2286,31 @@ static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg)
kfree(vol_args);
out:
mutex_unlock(&root->fs_info->volume_mutex);
+ atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0);
return ret;
}
-static long btrfs_ioctl_rm_dev(struct btrfs_root *root, void __user *arg)
+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_ioctl_vol_args *vol_args;
int ret;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
- if (root->fs_info->sb->s_flags & MS_RDONLY)
- return -EROFS;
+ ret = mnt_want_write_file(file);
+ if (ret)
+ return ret;
- mutex_lock(&root->fs_info->volume_mutex);
- if (root->fs_info->balance_ctl) {
- printk(KERN_INFO "btrfs: balance in progress\n");
- ret = -EINVAL;
- goto out;
+ if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running,
+ 1)) {
+ pr_info("btrfs: dev add/delete/balance/replace/resize operation in progress\n");
+ mnt_drop_write_file(file);
+ return -EINVAL;
}
+ mutex_lock(&root->fs_info->volume_mutex);
vol_args = memdup_user(arg, sizeof(*vol_args));
if (IS_ERR(vol_args)) {
ret = PTR_ERR(vol_args);
@@ -2207,6 +2323,8 @@ static long btrfs_ioctl_rm_dev(struct btrfs_root *root, void __user *arg)
kfree(vol_args);
out:
mutex_unlock(&root->fs_info->volume_mutex);
+ atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0);
+ mnt_drop_write_file(file);
return ret;
}
@@ -2262,7 +2380,7 @@ static long btrfs_ioctl_dev_info(struct btrfs_root *root, void __user *arg)
s_uuid = di_args->uuid;
mutex_lock(&fs_devices->device_list_mutex);
- dev = btrfs_find_device(root, di_args->devid, s_uuid, NULL);
+ dev = btrfs_find_device(root->fs_info, di_args->devid, s_uuid, NULL);
mutex_unlock(&fs_devices->device_list_mutex);
if (!dev) {
@@ -2299,7 +2417,7 @@ static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd,
{
struct inode *inode = fdentry(file)->d_inode;
struct btrfs_root *root = BTRFS_I(inode)->root;
- struct file *src_file;
+ struct fd src_file;
struct inode *src;
struct btrfs_trans_handle *trans;
struct btrfs_path *path;
@@ -2311,7 +2429,6 @@ static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd,
int ret;
u64 len = olen;
u64 bs = root->fs_info->sb->s_blocksize;
- u64 hint_byte;
/*
* TODO:
@@ -2334,20 +2451,24 @@ static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd,
if (ret)
return ret;
- src_file = fget(srcfd);
- if (!src_file) {
+ src_file = fdget(srcfd);
+ if (!src_file.file) {
ret = -EBADF;
goto out_drop_write;
}
- src = src_file->f_dentry->d_inode;
+ ret = -EXDEV;
+ if (src_file.file->f_path.mnt != file->f_path.mnt)
+ goto out_fput;
+
+ src = src_file.file->f_dentry->d_inode;
ret = -EINVAL;
if (src == inode)
goto out_fput;
/* the src must be open for reading */
- if (!(src_file->f_mode & FMODE_READ))
+ if (!(src_file.file->f_mode & FMODE_READ))
goto out_fput;
/* don't make the dst file partly checksummed */
@@ -2360,7 +2481,7 @@ static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd,
goto out_fput;
ret = -EXDEV;
- if (src->i_sb != inode->i_sb || BTRFS_I(src)->root != root)
+ if (src->i_sb != inode->i_sb)
goto out_fput;
ret = -ENOMEM;
@@ -2412,13 +2533,13 @@ static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd,
another, and lock file content */
while (1) {
struct btrfs_ordered_extent *ordered;
- lock_extent(&BTRFS_I(src)->io_tree, off, off+len);
- ordered = btrfs_lookup_first_ordered_extent(src, off+len);
+ lock_extent(&BTRFS_I(src)->io_tree, off, off + len - 1);
+ ordered = btrfs_lookup_first_ordered_extent(src, off + len - 1);
if (!ordered &&
- !test_range_bit(&BTRFS_I(src)->io_tree, off, off+len,
- EXTENT_DELALLOC, 0, NULL))
+ !test_range_bit(&BTRFS_I(src)->io_tree, off, off + len - 1,
+ EXTENT_DELALLOC, 0, NULL))
break;
- unlock_extent(&BTRFS_I(src)->io_tree, off, off+len);
+ unlock_extent(&BTRFS_I(src)->io_tree, off, off + len - 1);
if (ordered)
btrfs_put_ordered_extent(ordered);
btrfs_wait_ordered_range(src, off, len);
@@ -2434,13 +2555,14 @@ static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd,
* note the key will change type as we walk through the
* tree.
*/
- ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
+ ret = btrfs_search_slot(NULL, BTRFS_I(src)->root, &key, path,
+ 0, 0);
if (ret < 0)
goto out;
nritems = btrfs_header_nritems(path->nodes[0]);
if (path->slots[0] >= nritems) {
- ret = btrfs_next_leaf(root, path);
+ ret = btrfs_next_leaf(BTRFS_I(src)->root, path);
if (ret < 0)
goto out;
if (ret > 0)
@@ -2491,7 +2613,7 @@ static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd,
btrfs_release_path(path);
if (key.offset + datal <= off ||
- key.offset >= off+len)
+ key.offset >= off + len - 1)
goto next;
memcpy(&new_key, &key, sizeof(new_key));
@@ -2529,10 +2651,10 @@ static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd,
datal -= off - key.offset;
}
- ret = btrfs_drop_extents(trans, inode,
+ ret = btrfs_drop_extents(trans, root, inode,
new_key.offset,
new_key.offset + datal,
- &hint_byte, 1);
+ 1);
if (ret) {
btrfs_abort_transaction(trans, root,
ret);
@@ -2592,8 +2714,8 @@ static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd,
new_key.offset += skip;
}
- if (key.offset + datal > off+len)
- trim = key.offset + datal - (off+len);
+ if (key.offset + datal > off + len)
+ trim = key.offset + datal - (off + len);
if (comp && (skip || trim)) {
ret = -EINVAL;
@@ -2603,10 +2725,10 @@ static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd,
size -= skip + trim;
datal -= skip + trim;
- ret = btrfs_drop_extents(trans, inode,
+ ret = btrfs_drop_extents(trans, root, inode,
new_key.offset,
new_key.offset + datal,
- &hint_byte, 1);
+ 1);
if (ret) {
btrfs_abort_transaction(trans, root,
ret);
@@ -2670,14 +2792,14 @@ next:
ret = 0;
out:
btrfs_release_path(path);
- unlock_extent(&BTRFS_I(src)->io_tree, off, off+len);
+ unlock_extent(&BTRFS_I(src)->io_tree, off, off + len - 1);
out_unlock:
mutex_unlock(&src->i_mutex);
mutex_unlock(&inode->i_mutex);
vfree(buf);
btrfs_free_path(path);
out_fput:
- fput(src_file);
+ fdput(src_file);
out_drop_write:
mnt_drop_write_file(file);
return ret;
@@ -2749,16 +2871,21 @@ static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp)
struct btrfs_path *path;
struct btrfs_key location;
struct btrfs_disk_key disk_key;
- struct btrfs_super_block *disk_super;
- u64 features;
u64 objectid = 0;
u64 dir_id;
+ int ret;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
- if (copy_from_user(&objectid, argp, sizeof(objectid)))
- return -EFAULT;
+ ret = mnt_want_write_file(file);
+ if (ret)
+ return ret;
+
+ if (copy_from_user(&objectid, argp, sizeof(objectid))) {
+ ret = -EFAULT;
+ goto out;
+ }
if (!objectid)
objectid = root->root_key.objectid;
@@ -2768,21 +2895,28 @@ static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp)
location.offset = (u64)-1;
new_root = btrfs_read_fs_root_no_name(root->fs_info, &location);
- if (IS_ERR(new_root))
- return PTR_ERR(new_root);
+ if (IS_ERR(new_root)) {
+ ret = PTR_ERR(new_root);
+ goto out;
+ }
- if (btrfs_root_refs(&new_root->root_item) == 0)
- return -ENOENT;
+ if (btrfs_root_refs(&new_root->root_item) == 0) {
+ ret = -ENOENT;
+ goto out;
+ }
path = btrfs_alloc_path();
- if (!path)
- return -ENOMEM;
+ if (!path) {
+ ret = -ENOMEM;
+ goto out;
+ }
path->leave_spinning = 1;
trans = btrfs_start_transaction(root, 1);
if (IS_ERR(trans)) {
btrfs_free_path(path);
- return PTR_ERR(trans);
+ ret = PTR_ERR(trans);
+ goto out;
}
dir_id = btrfs_super_root_dir(root->fs_info->super_copy);
@@ -2793,7 +2927,8 @@ static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp)
btrfs_end_transaction(trans, root);
printk(KERN_ERR "Umm, you don't have the default dir item, "
"this isn't going to work\n");
- return -ENOENT;
+ ret = -ENOENT;
+ goto out;
}
btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key);
@@ -2801,19 +2936,15 @@ static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp)
btrfs_mark_buffer_dirty(path->nodes[0]);
btrfs_free_path(path);
- disk_super = root->fs_info->super_copy;
- features = btrfs_super_incompat_flags(disk_super);
- if (!(features & BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL)) {
- features |= BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL;
- btrfs_set_super_incompat_flags(disk_super, features);
- }
+ btrfs_set_fs_incompat(root->fs_info, DEFAULT_SUBVOL);
btrfs_end_transaction(trans, root);
-
- return 0;
+out:
+ mnt_drop_write_file(file);
+ return ret;
}
-static void get_block_group_info(struct list_head *groups_list,
- struct btrfs_ioctl_space_info *space)
+void btrfs_get_block_group_info(struct list_head *groups_list,
+ struct btrfs_ioctl_space_info *space)
{
struct btrfs_block_group_cache *block_group;
@@ -2921,8 +3052,8 @@ long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg)
down_read(&info->groups_sem);
for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) {
if (!list_empty(&info->block_groups[c])) {
- get_block_group_info(&info->block_groups[c],
- &space);
+ btrfs_get_block_group_info(
+ &info->block_groups[c], &space);
memcpy(dest, &space, sizeof(space));
dest++;
space_args.total_spaces++;
@@ -2973,32 +3104,38 @@ long btrfs_ioctl_trans_end(struct file *file)
return 0;
}
-static noinline long btrfs_ioctl_start_sync(struct file *file, void __user *argp)
+static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root,
+ 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);
+ trans = btrfs_attach_transaction(root);
+ if (IS_ERR(trans)) {
+ if (PTR_ERR(trans) != -ENOENT)
+ return PTR_ERR(trans);
+
+ /* No running transaction, don't bother */
+ transid = root->fs_info->last_trans_committed;
+ goto out;
+ }
transid = trans->transid;
ret = btrfs_commit_transaction_async(trans, root, 0);
if (ret) {
btrfs_end_transaction(trans, root);
return ret;
}
-
+out:
if (argp)
if (copy_to_user(argp, &transid, sizeof(transid)))
return -EFAULT;
return 0;
}
-static noinline long btrfs_ioctl_wait_sync(struct file *file, void __user *argp)
+static noinline long btrfs_ioctl_wait_sync(struct btrfs_root *root,
+ void __user *argp)
{
- struct btrfs_root *root = BTRFS_I(file->f_dentry->d_inode)->root;
u64 transid;
if (argp) {
@@ -3010,10 +3147,11 @@ static noinline long btrfs_ioctl_wait_sync(struct file *file, void __user *argp)
return btrfs_wait_for_commit(root, transid);
}
-static long btrfs_ioctl_scrub(struct btrfs_root *root, void __user *arg)
+static long btrfs_ioctl_scrub(struct file *file, void __user *arg)
{
- int ret;
+ struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
struct btrfs_ioctl_scrub_args *sa;
+ int ret;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
@@ -3022,12 +3160,22 @@ static long btrfs_ioctl_scrub(struct btrfs_root *root, void __user *arg)
if (IS_ERR(sa))
return PTR_ERR(sa);
- ret = btrfs_scrub_dev(root, sa->devid, sa->start, sa->end,
- &sa->progress, sa->flags & BTRFS_SCRUB_READONLY);
+ if (!(sa->flags & BTRFS_SCRUB_READONLY)) {
+ ret = mnt_want_write_file(file);
+ if (ret)
+ goto out;
+ }
+
+ ret = btrfs_scrub_dev(root->fs_info, sa->devid, sa->start, sa->end,
+ &sa->progress, sa->flags & BTRFS_SCRUB_READONLY,
+ 0);
if (copy_to_user(arg, sa, sizeof(*sa)))
ret = -EFAULT;
+ if (!(sa->flags & BTRFS_SCRUB_READONLY))
+ mnt_drop_write_file(file);
+out:
kfree(sa);
return ret;
}
@@ -3037,7 +3185,7 @@ static long btrfs_ioctl_scrub_cancel(struct btrfs_root *root, void __user *arg)
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
- return btrfs_scrub_cancel(root);
+ return btrfs_scrub_cancel(root->fs_info);
}
static long btrfs_ioctl_scrub_progress(struct btrfs_root *root,
@@ -3063,19 +3211,21 @@ static long btrfs_ioctl_scrub_progress(struct btrfs_root *root,
}
static long btrfs_ioctl_get_dev_stats(struct btrfs_root *root,
- void __user *arg, int reset_after_read)
+ void __user *arg)
{
struct btrfs_ioctl_get_dev_stats *sa;
int ret;
- if (reset_after_read && !capable(CAP_SYS_ADMIN))
- return -EPERM;
-
sa = memdup_user(arg, sizeof(*sa));
if (IS_ERR(sa))
return PTR_ERR(sa);
- ret = btrfs_get_dev_stats(root, sa, reset_after_read);
+ if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) {
+ kfree(sa);
+ return -EPERM;
+ }
+
+ ret = btrfs_get_dev_stats(root, sa);
if (copy_to_user(arg, sa, sizeof(*sa)))
ret = -EFAULT;
@@ -3084,6 +3234,51 @@ static long btrfs_ioctl_get_dev_stats(struct btrfs_root *root,
return ret;
}
+static long btrfs_ioctl_dev_replace(struct btrfs_root *root, void __user *arg)
+{
+ struct btrfs_ioctl_dev_replace_args *p;
+ int ret;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ p = memdup_user(arg, sizeof(*p));
+ if (IS_ERR(p))
+ return PTR_ERR(p);
+
+ switch (p->cmd) {
+ case BTRFS_IOCTL_DEV_REPLACE_CMD_START:
+ if (atomic_xchg(
+ &root->fs_info->mutually_exclusive_operation_running,
+ 1)) {
+ pr_info("btrfs: dev add/delete/balance/replace/resize operation in progress\n");
+ ret = -EINPROGRESS;
+ } else {
+ ret = btrfs_dev_replace_start(root, p);
+ atomic_set(
+ &root->fs_info->mutually_exclusive_operation_running,
+ 0);
+ }
+ break;
+ case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS:
+ btrfs_dev_replace_status(root->fs_info, p);
+ ret = 0;
+ break;
+ case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL:
+ ret = btrfs_dev_replace_cancel(root->fs_info, p);
+ break;
+ default:
+ ret = -EINVAL;
+ break;
+ }
+
+ if (copy_to_user(arg, p, sizeof(*p)))
+ ret = -EFAULT;
+
+ kfree(p);
+ return ret;
+}
+
static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg)
{
int ret = 0;
@@ -3168,11 +3363,9 @@ static long btrfs_ioctl_logical_to_ino(struct btrfs_root *root,
{
int ret = 0;
int size;
- u64 extent_item_pos;
struct btrfs_ioctl_logical_ino_args *loi;
struct btrfs_data_container *inodes = NULL;
struct btrfs_path *path = NULL;
- struct btrfs_key key;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
@@ -3190,7 +3383,7 @@ static long btrfs_ioctl_logical_to_ino(struct btrfs_root *root,
goto out;
}
- size = min_t(u32, loi->size, 4096);
+ size = min_t(u32, loi->size, 64 * 1024);
inodes = init_data_container(size);
if (IS_ERR(inodes)) {
ret = PTR_ERR(inodes);
@@ -3198,22 +3391,13 @@ static long btrfs_ioctl_logical_to_ino(struct btrfs_root *root,
goto out;
}
- ret = extent_from_logical(root->fs_info, loi->logical, path, &key);
- btrfs_release_path(path);
-
- if (ret & BTRFS_EXTENT_FLAG_TREE_BLOCK)
+ ret = iterate_inodes_from_logical(loi->logical, root->fs_info, path,
+ build_ino_list, inodes);
+ if (ret == -EINVAL)
ret = -ENOENT;
if (ret < 0)
goto out;
- extent_item_pos = loi->logical - key.objectid;
- ret = iterate_extent_inodes(root->fs_info, key.objectid,
- extent_item_pos, 0, build_ino_list,
- inodes);
-
- if (ret < 0)
- goto out;
-
ret = copy_to_user((void *)(unsigned long)loi->inodes,
(void *)(unsigned long)inodes, size);
if (ret)
@@ -3221,7 +3405,7 @@ static long btrfs_ioctl_logical_to_ino(struct btrfs_root *root,
out:
btrfs_free_path(path);
- kfree(inodes);
+ vfree(inodes);
kfree(loi);
return ret;
@@ -3260,26 +3444,71 @@ static long btrfs_ioctl_balance(struct file *file, void __user *arg)
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;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
- if (fs_info->sb->s_flags & MS_RDONLY)
- return -EROFS;
-
- ret = mnt_want_write(file->f_path.mnt);
+ ret = mnt_want_write_file(file);
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) {
@@ -3323,11 +3552,17 @@ 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;
@@ -3335,10 +3570,13 @@ do_balance:
out_bargs:
kfree(bargs);
-out:
+out_unlock:
mutex_unlock(&fs_info->balance_mutex);
mutex_unlock(&fs_info->volume_mutex);
- mnt_drop_write(file->f_path.mnt);
+ if (need_unlock)
+ atomic_set(&fs_info->mutually_exclusive_operation_running, 0);
+out:
+ mnt_drop_write_file(file);
return ret;
}
@@ -3390,6 +3628,292 @@ out:
return ret;
}
+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_ioctl_quota_ctl_args *sa;
+ struct btrfs_trans_handle *trans = NULL;
+ int ret;
+ int err;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ ret = mnt_want_write_file(file);
+ if (ret)
+ return ret;
+
+ sa = memdup_user(arg, sizeof(*sa));
+ if (IS_ERR(sa)) {
+ ret = PTR_ERR(sa);
+ goto drop_write;
+ }
+
+ if (sa->cmd != BTRFS_QUOTA_CTL_RESCAN) {
+ trans = btrfs_start_transaction(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, root->fs_info);
+ break;
+ case BTRFS_QUOTA_CTL_DISABLE:
+ ret = btrfs_quota_disable(trans, root->fs_info);
+ break;
+ case BTRFS_QUOTA_CTL_RESCAN:
+ ret = btrfs_quota_rescan(root->fs_info);
+ break;
+ default:
+ ret = -EINVAL;
+ break;
+ }
+
+ if (copy_to_user(arg, sa, sizeof(*sa)))
+ ret = -EFAULT;
+
+ if (trans) {
+ err = btrfs_commit_transaction(trans, root);
+ if (err && !ret)
+ ret = err;
+ }
+out:
+ kfree(sa);
+drop_write:
+ mnt_drop_write_file(file);
+ return ret;
+}
+
+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_ioctl_qgroup_assign_args *sa;
+ struct btrfs_trans_handle *trans;
+ int ret;
+ int err;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ ret = mnt_want_write_file(file);
+ if (ret)
+ return ret;
+
+ sa = memdup_user(arg, sizeof(*sa));
+ if (IS_ERR(sa)) {
+ ret = PTR_ERR(sa);
+ goto drop_write;
+ }
+
+ trans = btrfs_join_transaction(root);
+ if (IS_ERR(trans)) {
+ ret = PTR_ERR(trans);
+ goto out;
+ }
+
+ /* FIXME: check if the IDs really exist */
+ if (sa->assign) {
+ ret = btrfs_add_qgroup_relation(trans, root->fs_info,
+ sa->src, sa->dst);
+ } else {
+ ret = btrfs_del_qgroup_relation(trans, root->fs_info,
+ sa->src, sa->dst);
+ }
+
+ err = btrfs_end_transaction(trans, root);
+ if (err && !ret)
+ ret = err;
+
+out:
+ kfree(sa);
+drop_write:
+ mnt_drop_write_file(file);
+ return ret;
+}
+
+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_ioctl_qgroup_create_args *sa;
+ struct btrfs_trans_handle *trans;
+ int ret;
+ int err;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ ret = mnt_want_write_file(file);
+ if (ret)
+ return ret;
+
+ sa = memdup_user(arg, sizeof(*sa));
+ if (IS_ERR(sa)) {
+ ret = PTR_ERR(sa);
+ goto drop_write;
+ }
+
+ if (!sa->qgroupid) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ trans = btrfs_join_transaction(root);
+ if (IS_ERR(trans)) {
+ ret = PTR_ERR(trans);
+ goto out;
+ }
+
+ /* FIXME: check if the IDs really exist */
+ if (sa->create) {
+ ret = btrfs_create_qgroup(trans, root->fs_info, sa->qgroupid,
+ NULL);
+ } else {
+ ret = btrfs_remove_qgroup(trans, root->fs_info, sa->qgroupid);
+ }
+
+ err = btrfs_end_transaction(trans, root);
+ if (err && !ret)
+ ret = err;
+
+out:
+ kfree(sa);
+drop_write:
+ mnt_drop_write_file(file);
+ return ret;
+}
+
+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_ioctl_qgroup_limit_args *sa;
+ struct btrfs_trans_handle *trans;
+ int ret;
+ int err;
+ u64 qgroupid;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ ret = mnt_want_write_file(file);
+ if (ret)
+ return ret;
+
+ sa = memdup_user(arg, sizeof(*sa));
+ if (IS_ERR(sa)) {
+ ret = PTR_ERR(sa);
+ goto drop_write;
+ }
+
+ trans = btrfs_join_transaction(root);
+ if (IS_ERR(trans)) {
+ ret = PTR_ERR(trans);
+ goto out;
+ }
+
+ qgroupid = sa->qgroupid;
+ if (!qgroupid) {
+ /* take the current subvol as qgroup */
+ qgroupid = root->root_key.objectid;
+ }
+
+ /* FIXME: check if the IDs really exist */
+ ret = btrfs_limit_qgroup(trans, root->fs_info, qgroupid, &sa->lim);
+
+ err = btrfs_end_transaction(trans, root);
+ if (err && !ret)
+ ret = err;
+
+out:
+ kfree(sa);
+drop_write:
+ mnt_drop_write_file(file);
+ return ret;
+}
+
+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 btrfs_root *root = BTRFS_I(inode)->root;
+ struct btrfs_root_item *root_item = &root->root_item;
+ struct btrfs_trans_handle *trans;
+ struct timespec ct = CURRENT_TIME;
+ int ret = 0;
+
+ ret = mnt_want_write_file(file);
+ if (ret < 0)
+ return ret;
+
+ down_write(&root->fs_info->subvol_sem);
+
+ if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ if (btrfs_root_readonly(root)) {
+ ret = -EROFS;
+ goto out;
+ }
+
+ if (!inode_owner_or_capable(inode)) {
+ ret = -EACCES;
+ goto out;
+ }
+
+ sa = memdup_user(arg, sizeof(*sa));
+ if (IS_ERR(sa)) {
+ ret = PTR_ERR(sa);
+ sa = NULL;
+ goto out;
+ }
+
+ trans = btrfs_start_transaction(root, 1);
+ if (IS_ERR(trans)) {
+ ret = PTR_ERR(trans);
+ trans = NULL;
+ goto out;
+ }
+
+ sa->rtransid = trans->transid;
+ sa->rtime.sec = ct.tv_sec;
+ sa->rtime.nsec = ct.tv_nsec;
+
+ memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE);
+ btrfs_set_root_stransid(root_item, sa->stransid);
+ btrfs_set_root_rtransid(root_item, sa->rtransid);
+ root_item->stime.sec = cpu_to_le64(sa->stime.sec);
+ root_item->stime.nsec = cpu_to_le32(sa->stime.nsec);
+ root_item->rtime.sec = cpu_to_le64(sa->rtime.sec);
+ root_item->rtime.nsec = cpu_to_le32(sa->rtime.nsec);
+
+ ret = btrfs_update_root(trans, root->fs_info->tree_root,
+ &root->root_key, &root->root_item);
+ if (ret < 0) {
+ btrfs_end_transaction(trans, root);
+ trans = NULL;
+ goto out;
+ } else {
+ ret = btrfs_commit_transaction(trans, root);
+ if (ret < 0)
+ goto out;
+ }
+
+ ret = copy_to_user(arg, sa, sizeof(*sa));
+ if (ret)
+ ret = -EFAULT;
+
+out:
+ kfree(sa);
+ up_write(&root->fs_info->subvol_sem);
+ mnt_drop_write_file(file);
+ return ret;
+}
+
long btrfs_ioctl(struct file *file, unsigned int
cmd, unsigned long arg)
{
@@ -3411,6 +3935,8 @@ long btrfs_ioctl(struct file *file, unsigned int
return btrfs_ioctl_snap_create_v2(file, argp, 0);
case BTRFS_IOC_SUBVOL_CREATE:
return btrfs_ioctl_snap_create(file, argp, 1);
+ case BTRFS_IOC_SUBVOL_CREATE_V2:
+ return btrfs_ioctl_snap_create_v2(file, argp, 1);
case BTRFS_IOC_SNAP_DESTROY:
return btrfs_ioctl_snap_destroy(file, argp);
case BTRFS_IOC_SUBVOL_GETFLAGS:
@@ -3424,11 +3950,11 @@ long btrfs_ioctl(struct file *file, unsigned int
case BTRFS_IOC_DEFRAG_RANGE:
return btrfs_ioctl_defrag(file, argp);
case BTRFS_IOC_RESIZE:
- return btrfs_ioctl_resize(root, argp);
+ return btrfs_ioctl_resize(file, argp);
case BTRFS_IOC_ADD_DEV:
return btrfs_ioctl_add_dev(root, argp);
case BTRFS_IOC_RM_DEV:
- return btrfs_ioctl_rm_dev(root, argp);
+ return btrfs_ioctl_rm_dev(file, argp);
case BTRFS_IOC_FS_INFO:
return btrfs_ioctl_fs_info(root, argp);
case BTRFS_IOC_DEV_INFO:
@@ -3457,11 +3983,11 @@ long btrfs_ioctl(struct file *file, unsigned int
btrfs_sync_fs(file->f_dentry->d_sb, 1);
return 0;
case BTRFS_IOC_START_SYNC:
- return btrfs_ioctl_start_sync(file, argp);
+ return btrfs_ioctl_start_sync(root, argp);
case BTRFS_IOC_WAIT_SYNC:
- return btrfs_ioctl_wait_sync(file, argp);
+ return btrfs_ioctl_wait_sync(root, argp);
case BTRFS_IOC_SCRUB:
- return btrfs_ioctl_scrub(root, argp);
+ return btrfs_ioctl_scrub(file, argp);
case BTRFS_IOC_SCRUB_CANCEL:
return btrfs_ioctl_scrub_cancel(root, argp);
case BTRFS_IOC_SCRUB_PROGRESS:
@@ -3472,10 +3998,22 @@ long btrfs_ioctl(struct file *file, unsigned int
return btrfs_ioctl_balance_ctl(root, arg);
case BTRFS_IOC_BALANCE_PROGRESS:
return btrfs_ioctl_balance_progress(root, argp);
+ case BTRFS_IOC_SET_RECEIVED_SUBVOL:
+ return btrfs_ioctl_set_received_subvol(file, argp);
+ case BTRFS_IOC_SEND:
+ return btrfs_ioctl_send(file, argp);
case BTRFS_IOC_GET_DEV_STATS:
- return btrfs_ioctl_get_dev_stats(root, argp, 0);
- case BTRFS_IOC_GET_AND_RESET_DEV_STATS:
- return btrfs_ioctl_get_dev_stats(root, argp, 1);
+ return btrfs_ioctl_get_dev_stats(root, argp);
+ case BTRFS_IOC_QUOTA_CTL:
+ return btrfs_ioctl_quota_ctl(file, argp);
+ case BTRFS_IOC_QGROUP_ASSIGN:
+ return btrfs_ioctl_qgroup_assign(file, argp);
+ case BTRFS_IOC_QGROUP_CREATE:
+ return btrfs_ioctl_qgroup_create(file, argp);
+ case BTRFS_IOC_QGROUP_LIMIT:
+ return btrfs_ioctl_qgroup_limit(file, argp);
+ case BTRFS_IOC_DEV_REPLACE:
+ return btrfs_ioctl_dev_replace(root, argp);
}
return -ENOTTY;