diff options
Diffstat (limited to 'fs/quota/quota.c')
| -rw-r--r-- | fs/quota/quota.c | 40 |
1 files changed, 28 insertions, 12 deletions
diff --git a/fs/quota/quota.c b/fs/quota/quota.c index 9af95c7a0bbe..6d16b2be5ac4 100644 --- a/fs/quota/quota.c +++ b/fs/quota/quota.c @@ -20,6 +20,7 @@ #include <linux/writeback.h> #include <linux/nospec.h> #include "compat.h" +#include "../internal.h" static int check_quotactl_permission(struct super_block *sb, int type, int cmd, qid_t id) @@ -865,27 +866,42 @@ static bool quotactl_cmd_onoff(int cmd) static struct super_block *quotactl_block(const char __user *special, int cmd) { #ifdef CONFIG_BLOCK - struct block_device *bdev; struct super_block *sb; struct filename *tmp = getname(special); + bool excl = false, thawed = false; + int error; + dev_t dev; if (IS_ERR(tmp)) return ERR_CAST(tmp); - bdev = lookup_bdev(tmp->name); + error = lookup_bdev(tmp->name, &dev); putname(tmp); - if (IS_ERR(bdev)) - return ERR_CAST(bdev); - if (quotactl_cmd_onoff(cmd)) - sb = get_super_exclusive_thawed(bdev); - else if (quotactl_cmd_write(cmd)) - sb = get_super_thawed(bdev); - else - sb = get_super(bdev); - bdput(bdev); + if (error) + return ERR_PTR(error); + + if (quotactl_cmd_onoff(cmd)) { + excl = true; + thawed = true; + } else if (quotactl_cmd_write(cmd)) { + thawed = true; + } + +retry: + sb = user_get_super(dev, excl); if (!sb) return ERR_PTR(-ENODEV); - + if (thawed && sb->s_writers.frozen != SB_UNFROZEN) { + if (excl) + up_write(&sb->s_umount); + else + up_read(&sb->s_umount); + wait_event(sb->s_writers.wait_unfrozen, + sb->s_writers.frozen == SB_UNFROZEN); + put_super(sb); + goto retry; + } return sb; + #else return ERR_PTR(-ENODEV); #endif |