forked from luck/tmp_suning_uos_patched
btrfs: Require CAP_SYS_ADMIN for filesystem rebalance
Filesystem rebalancing (BTRFS_IOC_BALANCE) affects the entire filesystem and may run uninterruptibly for a long time. This does not seem to be something that an unprivileged user should be able to do. Reported-by: Aron Xu <happyaron.xu@gmail.com> Signed-off-by: Ben Hutchings <ben@decadent.org.uk> Signed-off-by: Chris Mason <chris.mason@oracle.com>
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@ -22,6 +22,7 @@
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#include <linux/blkdev.h>
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#include <linux/random.h>
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#include <linux/iocontext.h>
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#include <linux/capability.h>
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#include <asm/div64.h>
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#include "compat.h"
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#include "ctree.h"
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@ -2024,6 +2025,9 @@ int btrfs_balance(struct btrfs_root *dev_root)
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if (dev_root->fs_info->sb->s_flags & MS_RDONLY)
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return -EROFS;
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if (!capable(CAP_SYS_ADMIN))
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return -EPERM;
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mutex_lock(&dev_root->fs_info->volume_mutex);
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dev_root = dev_root->fs_info->dev_root;
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