quota: Cleanup S_NOQUOTA handling

Cleanup handling of S_NOQUOTA inode flag and document it a bit. The flag
does not have to be set under dqptr_sem. Only functions modifying inode's
dquot pointers have to check the flag under dqptr_sem before going forward
with the modification. This way we are sure that we cannot add new dquot
pointers to the inode which is just becoming a quota file.

The good thing about this cleanup is that there are no more places in quota
code which enforce i_mutex vs. dqptr_sem lock ordering (in particular that
dqptr_sem -> i_mutex of quota file). This should silence some (false) lockdep
warnings with ext4 + quota and generally make life of some filesystems easier.

Signed-off-by: Jan Kara <jack@suse.cz>

diff --git a/fs/quota/dquot.c b/fs/quota/dquot.c
index 3fc62b0..f6eaf0d 100644 (file)
--- a/fs/quota/dquot.c
+++ b/fs/quota/dquot.c
@@ -100,9 +100,13 @@
  *
  * Any operation working on dquots via inode pointers must hold dqptr_sem.  If
  * operation is just reading pointers from inode (or not using them at all) the
- * read lock is enough. If pointers are altered function must hold write lock
- * (these locking rules also apply for S_NOQUOTA flag in the inode - note that
- * for altering the flag i_mutex is also needed).
+ * read lock is enough. If pointers are altered function must hold write lock.
+ * Special care needs to be taken about S_NOQUOTA inode flag (marking that
+ * inode is a quota file). Functions adding pointers from inode to dquots have
+ * to check this flag under dqptr_sem and then (if S_NOQUOTA is not set) they
+ * have to do all pointer modifications before dropping dqptr_sem. This makes
+ * sure they cannot race with quotaon which first sets S_NOQUOTA flag and
+ * then drops all pointers to dquots from an inode.
  *
  * Each dquot has its dq_lock mutex. Locked dquots might not be referenced
  * from inodes (dquot_alloc_space() and such don't check the dq_lock).
@@ -1275,7 +1279,6 @@ int dquot_initialize(struct inode *inode, int type)
        }
 
        down_write(&sb_dqopt(sb)->dqptr_sem);
-       /* Having dqptr_sem we know NOQUOTA flags can't be altered... */
        if (IS_NOQUOTA(inode))
                goto out_err;
        for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
@@ -1431,11 +1434,6 @@ int __dquot_alloc_space(struct inode *inode, qsize_t number,
        }
 
        down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
-       if (IS_NOQUOTA(inode)) {
-               inode_incr_space(inode, number, reserve);
-               goto out_unlock;
-       }
-
        for (cnt = 0; cnt < MAXQUOTAS; cnt++)
                warntype[cnt] = QUOTA_NL_NOWARN;
 
@@ -1466,7 +1464,6 @@ int __dquot_alloc_space(struct inode *inode, qsize_t number,
        mark_all_dquot_dirty(inode->i_dquot);
 out_flush_warn:
        flush_warnings(inode->i_dquot, warntype);
-out_unlock:
        up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
 out:
        return ret;
@@ -1499,10 +1496,6 @@ int dquot_alloc_inode(const struct inode *inode, qsize_t number)
        for (cnt = 0; cnt < MAXQUOTAS; cnt++)
                warntype[cnt] = QUOTA_NL_NOWARN;
        down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
-       if (IS_NOQUOTA(inode)) {
-               up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
-               return QUOTA_OK;
-       }
        spin_lock(&dq_data_lock);
        for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
                if (!inode->i_dquot[cnt])
@@ -1539,12 +1532,6 @@ int dquot_claim_space(struct inode *inode, qsize_t number)
        }
 
        down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
-       if (IS_NOQUOTA(inode))  {
-               up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
-               inode_claim_rsv_space(inode, number);
-               goto out;
-       }
-
        spin_lock(&dq_data_lock);
        /* Claim reserved quotas to allocated quotas */
        for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
@@ -1573,17 +1560,11 @@ int __dquot_free_space(struct inode *inode, qsize_t number, int reserve)
        /* First test before acquiring mutex - solves deadlocks when we
          * re-enter the quota code and are already holding the mutex */
        if (IS_NOQUOTA(inode)) {
-out_sub:
                inode_decr_space(inode, number, reserve);
                return QUOTA_OK;
        }
 
        down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
-       /* Now recheck reliably when holding dqptr_sem */
-       if (IS_NOQUOTA(inode)) {
-               up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
-               goto out_sub;
-       }
        spin_lock(&dq_data_lock);
        for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
                if (!inode->i_dquot[cnt])
@@ -1636,11 +1617,6 @@ int dquot_free_inode(const struct inode *inode, qsize_t number)
                return QUOTA_OK;
 
        down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
-       /* Now recheck reliably when holding dqptr_sem */
-       if (IS_NOQUOTA(inode)) {
-               up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
-               return QUOTA_OK;
-       }
        spin_lock(&dq_data_lock);
        for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
                if (!inode->i_dquot[cnt])
@@ -1692,7 +1668,6 @@ int dquot_transfer(struct inode *inode, struct iattr *iattr)
                                              GRPQUOTA);
 
        down_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
-       /* Now recheck reliably when holding dqptr_sem */
        if (IS_NOQUOTA(inode)) {        /* File without quota accounting? */
                up_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
                goto put_all;
@@ -2010,13 +1985,15 @@ static int vfs_load_quota_inode(struct inode *inode, int type, int format_id,
                /* We don't want quota and atime on quota files (deadlocks
                 * possible) Also nobody should write to the file - we use
                 * special IO operations which ignore the immutable bit. */
-               down_write(&dqopt->dqptr_sem);
                mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
                oldflags = inode->i_flags & (S_NOATIME | S_IMMUTABLE |
                                             S_NOQUOTA);
                inode->i_flags |= S_NOQUOTA | S_NOATIME | S_IMMUTABLE;
                mutex_unlock(&inode->i_mutex);
-               up_write(&dqopt->dqptr_sem);
+               /*
+                * When S_NOQUOTA is set, remove dquot references as no more
+                * references can be added
+                */
                sb->dq_op->drop(inode);
        }
 
@@ -2053,14 +2030,12 @@ out_file_init:
        iput(inode);
 out_lock:
        if (oldflags != -1) {
-               down_write(&dqopt->dqptr_sem);
                mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
                /* Set the flags back (in the case of accidental quotaon()
                 * on a wrong file we don't want to mess up the flags) */
                inode->i_flags &= ~(S_NOATIME | S_NOQUOTA | S_IMMUTABLE);
                inode->i_flags |= oldflags;
                mutex_unlock(&inode->i_mutex);
-               up_write(&dqopt->dqptr_sem);
        }
        mutex_unlock(&dqopt->dqonoff_mutex);
 out_fmt: