Merge branch 'mutex-ops@next-for-chris' of git://github.com/idryomov/btrfs-unstable into linus
This commit is contained in:
Chris Mason
commit
83bfccb5c0
107
fs/btrfs/ioctl.c
107
fs/btrfs/ioctl.c
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@ -1340,7 +1340,7 @@ static noinline int btrfs_ioctl_resize(struct file *file,
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1)) {
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pr_info("btrfs: dev add/delete/balance/replace/resize operation in progress\n");
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mnt_drop_write_file(file);
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return -EINPROGRESS;
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return -EINVAL;
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}
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mutex_lock(&root->fs_info->volume_mutex);
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@ -1446,8 +1446,8 @@ out_free:
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kfree(vol_args);
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out:
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mutex_unlock(&root->fs_info->volume_mutex);
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mnt_drop_write_file(file);
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atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0);
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mnt_drop_write_file(file);
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return ret;
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}
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@ -2186,19 +2186,20 @@ static int btrfs_ioctl_defrag(struct file *file, void __user *argp)
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struct btrfs_ioctl_defrag_range_args *range;
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int ret;
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if (btrfs_root_readonly(root))
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return -EROFS;
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ret = mnt_want_write_file(file);
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if (ret)
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return ret;
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if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running,
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1)) {
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pr_info("btrfs: dev add/delete/balance/replace/resize operation in progress\n");
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return -EINPROGRESS;
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mnt_drop_write_file(file);
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return -EINVAL;
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}
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ret = mnt_want_write_file(file);
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if (ret) {
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atomic_set(&root->fs_info->mutually_exclusive_operation_running,
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0);
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return ret;
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if (btrfs_root_readonly(root)) {
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ret = -EROFS;
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goto out;
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}
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switch (inode->i_mode & S_IFMT) {
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@ -2250,8 +2251,8 @@ static int btrfs_ioctl_defrag(struct file *file, void __user *argp)
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ret = -EINVAL;
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}
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out:
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mnt_drop_write_file(file);
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atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0);
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mnt_drop_write_file(file);
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return ret;
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}
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@ -2266,7 +2267,7 @@ static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg)
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if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running,
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1)) {
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pr_info("btrfs: dev add/delete/balance/replace/resize operation in progress\n");
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return -EINPROGRESS;
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return -EINVAL;
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}
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mutex_lock(&root->fs_info->volume_mutex);
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@ -2303,7 +2304,7 @@ static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg)
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1)) {
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pr_info("btrfs: dev add/delete/balance/replace/resize operation in progress\n");
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mnt_drop_write_file(file);
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return -EINPROGRESS;
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return -EINVAL;
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}
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mutex_lock(&root->fs_info->volume_mutex);
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@ -2319,8 +2320,8 @@ static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg)
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kfree(vol_args);
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out:
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mutex_unlock(&root->fs_info->volume_mutex);
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mnt_drop_write_file(file);
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atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0);
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mnt_drop_write_file(file);
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return ret;
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}
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@ -3440,8 +3441,8 @@ static long btrfs_ioctl_balance(struct file *file, void __user *arg)
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struct btrfs_fs_info *fs_info = root->fs_info;
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struct btrfs_ioctl_balance_args *bargs;
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struct btrfs_balance_control *bctl;
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bool need_unlock; /* for mut. excl. ops lock */
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int ret;
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int need_to_clear_lock = 0;
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if (!capable(CAP_SYS_ADMIN))
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return -EPERM;
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@ -3450,14 +3451,61 @@ static long btrfs_ioctl_balance(struct file *file, void __user *arg)
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if (ret)
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return ret;
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mutex_lock(&fs_info->volume_mutex);
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again:
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if (!atomic_xchg(&fs_info->mutually_exclusive_operation_running, 1)) {
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mutex_lock(&fs_info->volume_mutex);
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mutex_lock(&fs_info->balance_mutex);
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need_unlock = true;
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goto locked;
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}
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/*
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* mut. excl. ops lock is locked. Three possibilites:
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* (1) some other op is running
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* (2) balance is running
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* (3) balance is paused -- special case (think resume)
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*/
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mutex_lock(&fs_info->balance_mutex);
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if (fs_info->balance_ctl) {
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/* this is either (2) or (3) */
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if (!atomic_read(&fs_info->balance_running)) {
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mutex_unlock(&fs_info->balance_mutex);
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if (!mutex_trylock(&fs_info->volume_mutex))
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goto again;
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mutex_lock(&fs_info->balance_mutex);
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if (fs_info->balance_ctl &&
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!atomic_read(&fs_info->balance_running)) {
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/* this is (3) */
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need_unlock = false;
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goto locked;
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}
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mutex_unlock(&fs_info->balance_mutex);
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mutex_unlock(&fs_info->volume_mutex);
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goto again;
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} else {
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/* this is (2) */
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mutex_unlock(&fs_info->balance_mutex);
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ret = -EINPROGRESS;
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goto out;
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}
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} else {
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/* this is (1) */
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mutex_unlock(&fs_info->balance_mutex);
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pr_info("btrfs: dev add/delete/balance/replace/resize operation in progress\n");
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ret = -EINVAL;
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goto out;
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}
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locked:
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BUG_ON(!atomic_read(&fs_info->mutually_exclusive_operation_running));
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if (arg) {
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bargs = memdup_user(arg, sizeof(*bargs));
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if (IS_ERR(bargs)) {
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ret = PTR_ERR(bargs);
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goto out;
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goto out_unlock;
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}
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if (bargs->flags & BTRFS_BALANCE_RESUME) {
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@ -3477,13 +3525,10 @@ static long btrfs_ioctl_balance(struct file *file, void __user *arg)
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bargs = NULL;
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}
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if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running,
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1)) {
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pr_info("btrfs: dev add/delete/balance/replace/resize operation in progress\n");
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if (fs_info->balance_ctl) {
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ret = -EINPROGRESS;
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goto out_bargs;
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}
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need_to_clear_lock = 1;
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bctl = kzalloc(sizeof(*bctl), GFP_NOFS);
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if (!bctl) {
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@ -3504,11 +3549,17 @@ static long btrfs_ioctl_balance(struct file *file, void __user *arg)
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}
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do_balance:
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ret = btrfs_balance(bctl, bargs);
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/*
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* bctl is freed in __cancel_balance or in free_fs_info if
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* restriper was paused all the way until unmount
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* Ownership of bctl and mutually_exclusive_operation_running
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* goes to to btrfs_balance. bctl is freed in __cancel_balance,
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* or, if restriper was paused all the way until unmount, in
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* free_fs_info. mutually_exclusive_operation_running is
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* cleared in __cancel_balance.
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*/
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need_unlock = false;
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ret = btrfs_balance(bctl, bargs);
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if (arg) {
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if (copy_to_user(arg, bargs, sizeof(*bargs)))
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ret = -EFAULT;
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@ -3516,12 +3567,12 @@ do_balance:
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out_bargs:
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kfree(bargs);
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out:
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if (need_to_clear_lock)
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atomic_set(&root->fs_info->mutually_exclusive_operation_running,
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0);
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out_unlock:
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mutex_unlock(&fs_info->balance_mutex);
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mutex_unlock(&fs_info->volume_mutex);
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if (need_unlock)
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atomic_set(&fs_info->mutually_exclusive_operation_running, 0);
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out:
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mnt_drop_write_file(file);
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return ret;
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}
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@ -2959,6 +2959,8 @@ static void __cancel_balance(struct btrfs_fs_info *fs_info)
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unset_balance_control(fs_info);
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ret = del_balance_item(fs_info->tree_root);
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BUG_ON(ret);
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atomic_set(&fs_info->mutually_exclusive_operation_running, 0);
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}
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void update_ioctl_balance_args(struct btrfs_fs_info *fs_info, int lock,
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@ -3138,8 +3140,10 @@ int btrfs_balance(struct btrfs_balance_control *bctl,
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out:
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if (bctl->flags & BTRFS_BALANCE_RESUME)
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__cancel_balance(fs_info);
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else
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else {
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kfree(bctl);
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atomic_set(&fs_info->mutually_exclusive_operation_running, 0);
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}
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return ret;
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}
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@ -3156,7 +3160,6 @@ static int balance_kthread(void *data)
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ret = btrfs_balance(fs_info->balance_ctl, NULL);
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}
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atomic_set(&fs_info->mutually_exclusive_operation_running, 0);
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mutex_unlock(&fs_info->balance_mutex);
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mutex_unlock(&fs_info->volume_mutex);
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@ -3179,7 +3182,6 @@ int btrfs_resume_balance_async(struct btrfs_fs_info *fs_info)
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return 0;
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}
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WARN_ON(atomic_xchg(&fs_info->mutually_exclusive_operation_running, 1));
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tsk = kthread_run(balance_kthread, fs_info, "btrfs-balance");
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if (IS_ERR(tsk))
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return PTR_ERR(tsk);
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@ -3233,6 +3235,8 @@ int btrfs_recover_balance(struct btrfs_fs_info *fs_info)
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btrfs_balance_sys(leaf, item, &disk_bargs);
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btrfs_disk_balance_args_to_cpu(&bctl->sys, &disk_bargs);
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WARN_ON(atomic_xchg(&fs_info->mutually_exclusive_operation_running, 1));
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mutex_lock(&fs_info->volume_mutex);
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mutex_lock(&fs_info->balance_mutex);
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