[PATCH] sem2mutex: quota
Semaphore to mutex conversion. The conversion was generated via scripts, and the result was validated automatically via a script as well. Signed-off-by: Ingo Molnar <mingo@elte.hu> Cc: Jan Kara <jack@ucw.cz> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Ingo Molnar
Linus Torvalds
Родитель
c039e3134a
Коммит
d3be915fc5
117
fs/dquot.c
117
fs/dquot.c
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@ -103,12 +103,12 @@
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* (these locking rules also apply for S_NOQUOTA flag in the inode - note that
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* for altering the flag i_mutex is also needed). If operation is holding
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* reference to dquot in other way (e.g. quotactl ops) it must be guarded by
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* dqonoff_sem.
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* dqonoff_mutex.
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* This locking assures that:
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* a) update/access to dquot pointers in inode is serialized
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* b) everyone is guarded against invalidate_dquots()
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*
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* Each dquot has its dq_lock semaphore. Locked dquots might not be referenced
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* Each dquot has its dq_lock mutex. Locked dquots might not be referenced
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* from inodes (dquot_alloc_space() and such don't check the dq_lock).
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* Currently dquot is locked only when it is being read to memory (or space for
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* it is being allocated) on the first dqget() and when it is being released on
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@ -118,8 +118,9 @@
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* spinlock to internal buffers before writing.
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*
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* Lock ordering (including related VFS locks) is the following:
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* i_mutex > dqonoff_sem > journal_lock > dqptr_sem > dquot->dq_lock > dqio_sem
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* i_mutex on quota files is special (it's below dqio_sem)
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* i_mutex > dqonoff_sem > journal_lock > dqptr_sem > dquot->dq_lock >
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* dqio_mutex
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* i_mutex on quota files is special (it's below dqio_mutex)
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*/
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static DEFINE_SPINLOCK(dq_list_lock);
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@ -280,8 +281,8 @@ static inline void remove_inuse(struct dquot *dquot)
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static void wait_on_dquot(struct dquot *dquot)
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{
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down(&dquot->dq_lock);
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up(&dquot->dq_lock);
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mutex_lock(&dquot->dq_lock);
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mutex_unlock(&dquot->dq_lock);
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}
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#define mark_dquot_dirty(dquot) ((dquot)->dq_sb->dq_op->mark_dirty(dquot))
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@ -320,8 +321,8 @@ int dquot_acquire(struct dquot *dquot)
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int ret = 0, ret2 = 0;
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struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
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down(&dquot->dq_lock);
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down(&dqopt->dqio_sem);
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mutex_lock(&dquot->dq_lock);
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mutex_lock(&dqopt->dqio_mutex);
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if (!test_bit(DQ_READ_B, &dquot->dq_flags))
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ret = dqopt->ops[dquot->dq_type]->read_dqblk(dquot);
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if (ret < 0)
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@ -342,8 +343,8 @@ int dquot_acquire(struct dquot *dquot)
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}
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set_bit(DQ_ACTIVE_B, &dquot->dq_flags);
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out_iolock:
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up(&dqopt->dqio_sem);
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up(&dquot->dq_lock);
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mutex_unlock(&dqopt->dqio_mutex);
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mutex_unlock(&dquot->dq_lock);
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return ret;
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}
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@ -355,7 +356,7 @@ int dquot_commit(struct dquot *dquot)
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int ret = 0, ret2 = 0;
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struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
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down(&dqopt->dqio_sem);
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mutex_lock(&dqopt->dqio_mutex);
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spin_lock(&dq_list_lock);
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if (!clear_dquot_dirty(dquot)) {
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spin_unlock(&dq_list_lock);
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@ -372,7 +373,7 @@ int dquot_commit(struct dquot *dquot)
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ret = ret2;
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}
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out_sem:
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up(&dqopt->dqio_sem);
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mutex_unlock(&dqopt->dqio_mutex);
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return ret;
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}
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@ -384,11 +385,11 @@ int dquot_release(struct dquot *dquot)
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int ret = 0, ret2 = 0;
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struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
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down(&dquot->dq_lock);
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mutex_lock(&dquot->dq_lock);
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/* Check whether we are not racing with some other dqget() */
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if (atomic_read(&dquot->dq_count) > 1)
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goto out_dqlock;
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down(&dqopt->dqio_sem);
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mutex_lock(&dqopt->dqio_mutex);
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if (dqopt->ops[dquot->dq_type]->release_dqblk) {
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ret = dqopt->ops[dquot->dq_type]->release_dqblk(dquot);
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/* Write the info */
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@ -398,9 +399,9 @@ int dquot_release(struct dquot *dquot)
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ret = ret2;
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}
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clear_bit(DQ_ACTIVE_B, &dquot->dq_flags);
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up(&dqopt->dqio_sem);
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mutex_unlock(&dqopt->dqio_mutex);
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out_dqlock:
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up(&dquot->dq_lock);
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mutex_unlock(&dquot->dq_lock);
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return ret;
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}
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@ -464,7 +465,7 @@ int vfs_quota_sync(struct super_block *sb, int type)
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struct quota_info *dqopt = sb_dqopt(sb);
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int cnt;
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down(&dqopt->dqonoff_sem);
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mutex_lock(&dqopt->dqonoff_mutex);
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for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
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if (type != -1 && cnt != type)
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continue;
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@ -499,7 +500,7 @@ int vfs_quota_sync(struct super_block *sb, int type)
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spin_lock(&dq_list_lock);
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dqstats.syncs++;
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spin_unlock(&dq_list_lock);
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up(&dqopt->dqonoff_sem);
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mutex_unlock(&dqopt->dqonoff_mutex);
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return 0;
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}
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@ -540,7 +541,7 @@ static int shrink_dqcache_memory(int nr, gfp_t gfp_mask)
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/*
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* Put reference to dquot
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* NOTE: If you change this function please check whether dqput_blocks() works right...
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* MUST be called with either dqptr_sem or dqonoff_sem held
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* MUST be called with either dqptr_sem or dqonoff_mutex held
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*/
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static void dqput(struct dquot *dquot)
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{
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@ -605,7 +606,7 @@ static struct dquot *get_empty_dquot(struct super_block *sb, int type)
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return NODQUOT;
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memset((caddr_t)dquot, 0, sizeof(struct dquot));
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sema_init(&dquot->dq_lock, 1);
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mutex_init(&dquot->dq_lock);
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INIT_LIST_HEAD(&dquot->dq_free);
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INIT_LIST_HEAD(&dquot->dq_inuse);
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INIT_HLIST_NODE(&dquot->dq_hash);
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@ -620,7 +621,7 @@ static struct dquot *get_empty_dquot(struct super_block *sb, int type)
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/*
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* Get reference to dquot
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* MUST be called with either dqptr_sem or dqonoff_sem held
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* MUST be called with either dqptr_sem or dqonoff_mutex held
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*/
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static struct dquot *dqget(struct super_block *sb, unsigned int id, int type)
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{
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@ -686,7 +687,7 @@ static int dqinit_needed(struct inode *inode, int type)
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return 0;
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}
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/* This routine is guarded by dqonoff_sem semaphore */
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/* This routine is guarded by dqonoff_mutex mutex */
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static void add_dquot_ref(struct super_block *sb, int type)
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{
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struct list_head *p;
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@ -964,8 +965,8 @@ int dquot_initialize(struct inode *inode, int type)
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unsigned int id = 0;
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int cnt, ret = 0;
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/* First test before acquiring semaphore - solves deadlocks when we
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* re-enter the quota code and are already holding the semaphore */
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/* First test before acquiring mutex - solves deadlocks when we
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* re-enter the quota code and are already holding the mutex */
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if (IS_NOQUOTA(inode))
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return 0;
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down_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
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@ -1028,8 +1029,8 @@ int dquot_alloc_space(struct inode *inode, qsize_t number, int warn)
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int cnt, ret = NO_QUOTA;
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char warntype[MAXQUOTAS];
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/* First test before acquiring semaphore - solves deadlocks when we
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* re-enter the quota code and are already holding the semaphore */
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/* First test before acquiring mutex - solves deadlocks when we
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* re-enter the quota code and are already holding the mutex */
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if (IS_NOQUOTA(inode)) {
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out_add:
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inode_add_bytes(inode, number);
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@ -1077,8 +1078,8 @@ int dquot_alloc_inode(const struct inode *inode, unsigned long number)
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int cnt, ret = NO_QUOTA;
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char warntype[MAXQUOTAS];
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/* First test before acquiring semaphore - solves deadlocks when we
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* re-enter the quota code and are already holding the semaphore */
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/* First test before acquiring mutex - solves deadlocks when we
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* re-enter the quota code and are already holding the mutex */
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if (IS_NOQUOTA(inode))
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return QUOTA_OK;
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for (cnt = 0; cnt < MAXQUOTAS; cnt++)
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@ -1121,8 +1122,8 @@ int dquot_free_space(struct inode *inode, qsize_t number)
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{
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unsigned int cnt;
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/* First test before acquiring semaphore - solves deadlocks when we
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* re-enter the quota code and are already holding the semaphore */
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/* First test before acquiring mutex - solves deadlocks when we
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* re-enter the quota code and are already holding the mutex */
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if (IS_NOQUOTA(inode)) {
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out_sub:
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inode_sub_bytes(inode, number);
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@ -1157,8 +1158,8 @@ int dquot_free_inode(const struct inode *inode, unsigned long number)
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{
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unsigned int cnt;
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/* First test before acquiring semaphore - solves deadlocks when we
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* re-enter the quota code and are already holding the semaphore */
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/* First test before acquiring mutex - solves deadlocks when we
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* re-enter the quota code and are already holding the mutex */
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if (IS_NOQUOTA(inode))
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return QUOTA_OK;
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down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
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@ -1197,8 +1198,8 @@ int dquot_transfer(struct inode *inode, struct iattr *iattr)
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chgid = (iattr->ia_valid & ATTR_GID) && inode->i_gid != iattr->ia_gid;
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char warntype[MAXQUOTAS];
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/* First test before acquiring semaphore - solves deadlocks when we
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* re-enter the quota code and are already holding the semaphore */
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/* First test before acquiring mutex - solves deadlocks when we
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* re-enter the quota code and are already holding the mutex */
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if (IS_NOQUOTA(inode))
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return QUOTA_OK;
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/* Clear the arrays */
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@ -1292,9 +1293,9 @@ int dquot_commit_info(struct super_block *sb, int type)
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int ret;
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struct quota_info *dqopt = sb_dqopt(sb);
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down(&dqopt->dqio_sem);
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mutex_lock(&dqopt->dqio_mutex);
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ret = dqopt->ops[type]->write_file_info(sb, type);
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up(&dqopt->dqio_sem);
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mutex_unlock(&dqopt->dqio_mutex);
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return ret;
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}
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@ -1350,7 +1351,7 @@ int vfs_quota_off(struct super_block *sb, int type)
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struct inode *toputinode[MAXQUOTAS];
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/* We need to serialize quota_off() for device */
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down(&dqopt->dqonoff_sem);
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mutex_lock(&dqopt->dqonoff_mutex);
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for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
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toputinode[cnt] = NULL;
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if (type != -1 && cnt != type)
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@ -1379,7 +1380,7 @@ int vfs_quota_off(struct super_block *sb, int type)
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dqopt->info[cnt].dqi_bgrace = 0;
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dqopt->ops[cnt] = NULL;
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}
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up(&dqopt->dqonoff_sem);
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mutex_unlock(&dqopt->dqonoff_mutex);
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/* Sync the superblock so that buffers with quota data are written to
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* disk (and so userspace sees correct data afterwards). */
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if (sb->s_op->sync_fs)
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@ -1392,7 +1393,7 @@ int vfs_quota_off(struct super_block *sb, int type)
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* changes done by userspace on the next quotaon() */
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for (cnt = 0; cnt < MAXQUOTAS; cnt++)
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if (toputinode[cnt]) {
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down(&dqopt->dqonoff_sem);
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mutex_lock(&dqopt->dqonoff_mutex);
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/* If quota was reenabled in the meantime, we have
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* nothing to do */
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if (!sb_has_quota_enabled(sb, cnt)) {
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@ -1404,7 +1405,7 @@ int vfs_quota_off(struct super_block *sb, int type)
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mark_inode_dirty(toputinode[cnt]);
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iput(toputinode[cnt]);
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}
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up(&dqopt->dqonoff_sem);
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mutex_unlock(&dqopt->dqonoff_mutex);
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}
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if (sb->s_bdev)
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invalidate_bdev(sb->s_bdev, 0);
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@ -1445,7 +1446,7 @@ static int vfs_quota_on_inode(struct inode *inode, int type, int format_id)
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/* And now flush the block cache so that kernel sees the changes */
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invalidate_bdev(sb->s_bdev, 0);
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mutex_lock(&inode->i_mutex);
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down(&dqopt->dqonoff_sem);
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mutex_lock(&dqopt->dqonoff_mutex);
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if (sb_has_quota_enabled(sb, type)) {
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error = -EBUSY;
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goto out_lock;
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@ -1470,17 +1471,17 @@ static int vfs_quota_on_inode(struct inode *inode, int type, int format_id)
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dqopt->ops[type] = fmt->qf_ops;
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dqopt->info[type].dqi_format = fmt;
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INIT_LIST_HEAD(&dqopt->info[type].dqi_dirty_list);
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down(&dqopt->dqio_sem);
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mutex_lock(&dqopt->dqio_mutex);
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if ((error = dqopt->ops[type]->read_file_info(sb, type)) < 0) {
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up(&dqopt->dqio_sem);
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mutex_unlock(&dqopt->dqio_mutex);
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goto out_file_init;
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}
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up(&dqopt->dqio_sem);
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mutex_unlock(&dqopt->dqio_mutex);
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mutex_unlock(&inode->i_mutex);
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set_enable_flags(dqopt, type);
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add_dquot_ref(sb, type);
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up(&dqopt->dqonoff_sem);
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mutex_unlock(&dqopt->dqonoff_mutex);
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return 0;
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@ -1488,7 +1489,7 @@ out_file_init:
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dqopt->files[type] = NULL;
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iput(inode);
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out_lock:
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up(&dqopt->dqonoff_sem);
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mutex_unlock(&dqopt->dqonoff_mutex);
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if (oldflags != -1) {
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down_write(&dqopt->dqptr_sem);
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/* Set the flags back (in the case of accidental quotaon()
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@ -1576,14 +1577,14 @@ int vfs_get_dqblk(struct super_block *sb, int type, qid_t id, struct if_dqblk *d
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{
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struct dquot *dquot;
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down(&sb_dqopt(sb)->dqonoff_sem);
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mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
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if (!(dquot = dqget(sb, id, type))) {
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up(&sb_dqopt(sb)->dqonoff_sem);
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mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
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return -ESRCH;
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}
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do_get_dqblk(dquot, di);
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dqput(dquot);
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up(&sb_dqopt(sb)->dqonoff_sem);
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mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
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return 0;
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}
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@ -1645,14 +1646,14 @@ int vfs_set_dqblk(struct super_block *sb, int type, qid_t id, struct if_dqblk *d
|
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{
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struct dquot *dquot;
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down(&sb_dqopt(sb)->dqonoff_sem);
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mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
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if (!(dquot = dqget(sb, id, type))) {
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up(&sb_dqopt(sb)->dqonoff_sem);
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mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
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return -ESRCH;
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}
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do_set_dqblk(dquot, di);
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dqput(dquot);
|
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up(&sb_dqopt(sb)->dqonoff_sem);
|
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mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
|
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return 0;
|
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}
|
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|
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|
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@ -1661,9 +1662,9 @@ int vfs_get_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii)
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{
|
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struct mem_dqinfo *mi;
|
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|
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down(&sb_dqopt(sb)->dqonoff_sem);
|
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mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
|
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if (!sb_has_quota_enabled(sb, type)) {
|
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up(&sb_dqopt(sb)->dqonoff_sem);
|
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mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
|
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return -ESRCH;
|
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}
|
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mi = sb_dqopt(sb)->info + type;
|
||||
|
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@ -1673,7 +1674,7 @@ int vfs_get_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii)
|
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ii->dqi_flags = mi->dqi_flags & DQF_MASK;
|
||||
ii->dqi_valid = IIF_ALL;
|
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spin_unlock(&dq_data_lock);
|
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up(&sb_dqopt(sb)->dqonoff_sem);
|
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mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
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@ -1682,9 +1683,9 @@ int vfs_set_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii)
|
|||
{
|
||||
struct mem_dqinfo *mi;
|
||||
|
||||
down(&sb_dqopt(sb)->dqonoff_sem);
|
||||
mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
|
||||
if (!sb_has_quota_enabled(sb, type)) {
|
||||
up(&sb_dqopt(sb)->dqonoff_sem);
|
||||
mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
|
||||
return -ESRCH;
|
||||
}
|
||||
mi = sb_dqopt(sb)->info + type;
|
||||
|
|
@ -1699,7 +1700,7 @@ int vfs_set_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii)
|
|||
mark_info_dirty(sb, type);
|
||||
/* Force write to disk */
|
||||
sb->dq_op->write_info(sb, type);
|
||||
up(&sb_dqopt(sb)->dqonoff_sem);
|
||||
mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
|
|
|||
|
|
@ -2382,8 +2382,8 @@ static int ext3_statfs (struct super_block * sb, struct kstatfs * buf)
|
|||
* Process 1 Process 2
|
||||
* ext3_create() quota_sync()
|
||||
* journal_start() write_dquot()
|
||||
* DQUOT_INIT() down(dqio_sem)
|
||||
* down(dqio_sem) journal_start()
|
||||
* DQUOT_INIT() down(dqio_mutex)
|
||||
* down(dqio_mutex) journal_start()
|
||||
*
|
||||
*/
|
||||
|
||||
|
|
|
|||
|
|
@ -170,10 +170,10 @@ static void quota_sync_sb(struct super_block *sb, int type)
|
|||
|
||||
/* Now when everything is written we can discard the pagecache so
|
||||
* that userspace sees the changes. We need i_mutex and so we could
|
||||
* not do it inside dqonoff_sem. Moreover we need to be carefull
|
||||
* not do it inside dqonoff_mutex. Moreover we need to be carefull
|
||||
* about races with quotaoff() (that is the reason why we have own
|
||||
* reference to inode). */
|
||||
down(&sb_dqopt(sb)->dqonoff_sem);
|
||||
mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
|
||||
for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
|
||||
discard[cnt] = NULL;
|
||||
if (type != -1 && cnt != type)
|
||||
|
|
@ -182,7 +182,7 @@ static void quota_sync_sb(struct super_block *sb, int type)
|
|||
continue;
|
||||
discard[cnt] = igrab(sb_dqopt(sb)->files[cnt]);
|
||||
}
|
||||
up(&sb_dqopt(sb)->dqonoff_sem);
|
||||
mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
|
||||
for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
|
||||
if (discard[cnt]) {
|
||||
mutex_lock(&discard[cnt]->i_mutex);
|
||||
|
|
|
|||
|
|
@ -394,7 +394,7 @@ static int v2_write_dquot(struct dquot *dquot)
|
|||
ssize_t ret;
|
||||
struct v2_disk_dqblk ddquot, empty;
|
||||
|
||||
/* dq_off is guarded by dqio_sem */
|
||||
/* dq_off is guarded by dqio_mutex */
|
||||
if (!dquot->dq_off)
|
||||
if ((ret = dq_insert_tree(dquot)) < 0) {
|
||||
printk(KERN_ERR "VFS: Error %zd occurred while creating quota.\n", ret);
|
||||
|
|
|
|||
|
|
@ -77,8 +77,8 @@ static struct super_block *alloc_super(void)
|
|||
s->s_count = S_BIAS;
|
||||
atomic_set(&s->s_active, 1);
|
||||
sema_init(&s->s_vfs_rename_sem,1);
|
||||
sema_init(&s->s_dquot.dqio_sem, 1);
|
||||
sema_init(&s->s_dquot.dqonoff_sem, 1);
|
||||
mutex_init(&s->s_dquot.dqio_mutex);
|
||||
mutex_init(&s->s_dquot.dqonoff_mutex);
|
||||
init_rwsem(&s->s_dquot.dqptr_sem);
|
||||
init_waitqueue_head(&s->s_wait_unfrozen);
|
||||
s->s_maxbytes = MAX_NON_LFS;
|
||||
|
|
|
|||
|
|
@ -38,6 +38,7 @@
|
|||
#include <linux/errno.h>
|
||||
#include <linux/types.h>
|
||||
#include <linux/spinlock.h>
|
||||
#include <linux/mutex.h>
|
||||
|
||||
#define __DQUOT_VERSION__ "dquot_6.5.1"
|
||||
#define __DQUOT_NUM_VERSION__ 6*10000+5*100+1
|
||||
|
|
@ -215,7 +216,7 @@ struct dquot {
|
|||
struct list_head dq_inuse; /* List of all quotas */
|
||||
struct list_head dq_free; /* Free list element */
|
||||
struct list_head dq_dirty; /* List of dirty dquots */
|
||||
struct semaphore dq_lock; /* dquot IO lock */
|
||||
struct mutex dq_lock; /* dquot IO lock */
|
||||
atomic_t dq_count; /* Use count */
|
||||
wait_queue_head_t dq_wait_unused; /* Wait queue for dquot to become unused */
|
||||
struct super_block *dq_sb; /* superblock this applies to */
|
||||
|
|
@ -285,8 +286,8 @@ struct quota_format_type {
|
|||
|
||||
struct quota_info {
|
||||
unsigned int flags; /* Flags for diskquotas on this device */
|
||||
struct semaphore dqio_sem; /* lock device while I/O in progress */
|
||||
struct semaphore dqonoff_sem; /* Serialize quotaon & quotaoff */
|
||||
struct mutex dqio_mutex; /* lock device while I/O in progress */
|
||||
struct mutex dqonoff_mutex; /* Serialize quotaon & quotaoff */
|
||||
struct rw_semaphore dqptr_sem; /* serialize ops using quota_info struct, pointers from inode to dquots */
|
||||
struct inode *files[MAXQUOTAS]; /* inodes of quotafiles */
|
||||
struct mem_dqinfo info[MAXQUOTAS]; /* Information for each quota type */
|
||||
|
|
|
|||
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