quota: Move quota files into separate directory

Quota subsystem has more and more files. It's time to create a dir for it.

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

1 files changed, 0 insertions, 2564 deletions

diff --git a/fs/dquot.c b/fs/dquot.c
deleted file mode 100644
index 28aa1466760..00000000000
--- a/fs/dquot.c
+++ /dev/null
@@ -1,2564 +0,0 @@
-/*
- * Implementation of the diskquota system for the LINUX operating system. QUOTA
- * is implemented using the BSD system call interface as the means of
- * communication with the user level. This file contains the generic routines
- * called by the different filesystems on allocation of an inode or block.
- * These routines take care of the administration needed to have a consistent
- * diskquota tracking system. The ideas of both user and group quotas are based
- * on the Melbourne quota system as used on BSD derived systems. The internal
- * implementation is based on one of the several variants of the LINUX
- * inode-subsystem with added complexity of the diskquota system.
- * 
- * Author:	Marco van Wieringen <mvw@planets.elm.net>
- *
- * Fixes:   Dmitry Gorodchanin <pgmdsg@ibi.com>, 11 Feb 96
- *
- *		Revised list management to avoid races
- *		-- Bill Hawes, <whawes@star.net>, 9/98
- *
- *		Fixed races in dquot_transfer(), dqget() and dquot_alloc_...().
- *		As the consequence the locking was moved from dquot_decr_...(),
- *		dquot_incr_...() to calling functions.
- *		invalidate_dquots() now writes modified dquots.
- *		Serialized quota_off() and quota_on() for mount point.
- *		Fixed a few bugs in grow_dquots().
- *		Fixed deadlock in write_dquot() - we no longer account quotas on
- *		quota files
- *		remove_dquot_ref() moved to inode.c - it now traverses through inodes
- *		add_dquot_ref() restarts after blocking
- *		Added check for bogus uid and fixed check for group in quotactl.
- *		Jan Kara, <jack@suse.cz>, sponsored by SuSE CR, 10-11/99
- *
- *		Used struct list_head instead of own list struct
- *		Invalidation of referenced dquots is no longer possible
- *		Improved free_dquots list management
- *		Quota and i_blocks are now updated in one place to avoid races
- *		Warnings are now delayed so we won't block in critical section
- *		Write updated not to require dquot lock
- *		Jan Kara, <jack@suse.cz>, 9/2000
- *
- *		Added dynamic quota structure allocation
- *		Jan Kara <jack@suse.cz> 12/2000
- *
- *		Rewritten quota interface. Implemented new quota format and
- *		formats registering.
- *		Jan Kara, <jack@suse.cz>, 2001,2002
- *
- *		New SMP locking.
- *		Jan Kara, <jack@suse.cz>, 10/2002
- *
- *		Added journalled quota support, fix lock inversion problems
- *		Jan Kara, <jack@suse.cz>, 2003,2004
- *
- * (C) Copyright 1994 - 1997 Marco van Wieringen 
- */
-
-#include <linux/errno.h>
-#include <linux/kernel.h>
-#include <linux/fs.h>
-#include <linux/mount.h>
-#include <linux/mm.h>
-#include <linux/time.h>
-#include <linux/types.h>
-#include <linux/string.h>
-#include <linux/fcntl.h>
-#include <linux/stat.h>
-#include <linux/tty.h>
-#include <linux/file.h>
-#include <linux/slab.h>
-#include <linux/sysctl.h>
-#include <linux/init.h>
-#include <linux/module.h>
-#include <linux/proc_fs.h>
-#include <linux/security.h>
-#include <linux/kmod.h>
-#include <linux/namei.h>
-#include <linux/buffer_head.h>
-#include <linux/capability.h>
-#include <linux/quotaops.h>
-#include <linux/writeback.h> /* for inode_lock, oddly enough.. */
-#ifdef CONFIG_QUOTA_NETLINK_INTERFACE
-#include <net/netlink.h>
-#include <net/genetlink.h>
-#endif
-
-#include <asm/uaccess.h>
-
-#define __DQUOT_PARANOIA
-
-/*
- * There are three quota SMP locks. dq_list_lock protects all lists with quotas
- * and quota formats, dqstats structure containing statistics about the lists
- * dq_data_lock protects data from dq_dqb and also mem_dqinfo structures and
- * also guards consistency of dquot->dq_dqb with inode->i_blocks, i_bytes.
- * i_blocks and i_bytes updates itself are guarded by i_lock acquired directly
- * in inode_add_bytes() and inode_sub_bytes(). dq_state_lock protects
- * modifications of quota state (on quotaon and quotaoff) and readers who care
- * about latest values take it as well.
- *
- * The spinlock ordering is hence: dq_data_lock > dq_list_lock > i_lock,
- *   dq_list_lock > dq_state_lock
- *
- * Note that some things (eg. sb pointer, type, id) doesn't change during
- * the life of the dquot structure and so needn't to be protected by a lock
- *
- * 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).
- *
- * 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).
- * Currently dquot is locked only when it is being read to memory (or space for
- * it is being allocated) on the first dqget() and when it is being released on
- * the last dqput(). The allocation and release oparations are serialized by
- * the dq_lock and by checking the use count in dquot_release().  Write
- * operations on dquots don't hold dq_lock as they copy data under dq_data_lock
- * spinlock to internal buffers before writing.
- *
- * Lock ordering (including related VFS locks) is the following:
- *   i_mutex > dqonoff_sem > journal_lock > dqptr_sem > dquot->dq_lock >
- *   dqio_mutex
- * The lock ordering of dqptr_sem imposed by quota code is only dqonoff_sem >
- * dqptr_sem. But filesystem has to count with the fact that functions such as
- * dquot_alloc_space() acquire dqptr_sem and they usually have to be called
- * from inside a transaction to keep filesystem consistency after a crash. Also
- * filesystems usually want to do some IO on dquot from ->mark_dirty which is
- * called with dqptr_sem held.
- * i_mutex on quota files is special (it's below dqio_mutex)
- */
-
-static DEFINE_SPINLOCK(dq_list_lock);
-static DEFINE_SPINLOCK(dq_state_lock);
-DEFINE_SPINLOCK(dq_data_lock);
-EXPORT_SYMBOL(dq_data_lock);
-
-static char *quotatypes[] = INITQFNAMES;
-static struct quota_format_type *quota_formats;	/* List of registered formats */
-static struct quota_module_name module_names[] = INIT_QUOTA_MODULE_NAMES;
-
-/* SLAB cache for dquot structures */
-static struct kmem_cache *dquot_cachep;
-
-int register_quota_format(struct quota_format_type *fmt)
-{
-	spin_lock(&dq_list_lock);
-	fmt->qf_next = quota_formats;
-	quota_formats = fmt;
-	spin_unlock(&dq_list_lock);
-	return 0;
-}
-EXPORT_SYMBOL(register_quota_format);
-
-void unregister_quota_format(struct quota_format_type *fmt)
-{
-	struct quota_format_type **actqf;
-
-	spin_lock(&dq_list_lock);
-	for (actqf = &quota_formats; *actqf && *actqf != fmt; actqf = &(*actqf)->qf_next);
-	if (*actqf)
-		*actqf = (*actqf)->qf_next;
-	spin_unlock(&dq_list_lock);
-}
-EXPORT_SYMBOL(unregister_quota_format);
-
-static struct quota_format_type *find_quota_format(int id)
-{
-	struct quota_format_type *actqf;
-
-	spin_lock(&dq_list_lock);
-	for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id; actqf = actqf->qf_next);
-	if (!actqf || !try_module_get(actqf->qf_owner)) {
-		int qm;
-
-		spin_unlock(&dq_list_lock);
-		
-		for (qm = 0; module_names[qm].qm_fmt_id && module_names[qm].qm_fmt_id != id; qm++);
-		if (!module_names[qm].qm_fmt_id || request_module(module_names[qm].qm_mod_name))
-			return NULL;
-
-		spin_lock(&dq_list_lock);
-		for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id; actqf = actqf->qf_next);
-		if (actqf && !try_module_get(actqf->qf_owner))
-			actqf = NULL;
-	}
-	spin_unlock(&dq_list_lock);
-	return actqf;
-}
-
-static void put_quota_format(struct quota_format_type *fmt)
-{
-	module_put(fmt->qf_owner);
-}
-
-/*
- * Dquot List Management:
- * The quota code uses three lists for dquot management: the inuse_list,
- * free_dquots, and dquot_hash[] array. A single dquot structure may be
- * on all three lists, depending on its current state.
- *
- * All dquots are placed to the end of inuse_list when first created, and this
- * list is used for invalidate operation, which must look at every dquot.
- *
- * Unused dquots (dq_count == 0) are added to the free_dquots list when freed,
- * and this list is searched whenever we need an available dquot.  Dquots are
- * removed from the list as soon as they are used again, and
- * dqstats.free_dquots gives the number of dquots on the list. When
- * dquot is invalidated it's completely released from memory.
- *
- * Dquots with a specific identity (device, type and id) are placed on
- * one of the dquot_hash[] hash chains. The provides an efficient search
- * mechanism to locate a specific dquot.
- */
-
-static LIST_HEAD(inuse_list);
-static LIST_HEAD(free_dquots);
-static unsigned int dq_hash_bits, dq_hash_mask;
-static struct hlist_head *dquot_hash;
-
-struct dqstats dqstats;
-EXPORT_SYMBOL(dqstats);
-
-static inline unsigned int
-hashfn(const struct super_block *sb, unsigned int id, int type)
-{
-	unsigned long tmp;
-
-	tmp = (((unsigned long)sb>>L1_CACHE_SHIFT) ^ id) * (MAXQUOTAS - type);
-	return (tmp + (tmp >> dq_hash_bits)) & dq_hash_mask;
-}
-
-/*
- * Following list functions expect dq_list_lock to be held
- */
-static inline void insert_dquot_hash(struct dquot *dquot)
-{
-	struct hlist_head *head = dquot_hash + hashfn(dquot->dq_sb, dquot->dq_id, dquot->dq_type);
-	hlist_add_head(&dquot->dq_hash, head);
-}
-
-static inline void remove_dquot_hash(struct dquot *dquot)
-{
-	hlist_del_init(&dquot->dq_hash);
-}
-
-static inline struct dquot *find_dquot(unsigned int hashent, struct super_block *sb, unsigned int id, int type)
-{
-	struct hlist_node *node;
-	struct dquot *dquot;
-
-	hlist_for_each (node, dquot_hash+hashent) {
-		dquot = hlist_entry(node, struct dquot, dq_hash);
-		if (dquot->dq_sb == sb && dquot->dq_id == id && dquot->dq_type == type)
-			return dquot;
-	}
-	return NODQUOT;
-}
-
-/* Add a dquot to the tail of the free list */
-static inline void put_dquot_last(struct dquot *dquot)
-{
-	list_add_tail(&dquot->dq_free, &free_dquots);
-	dqstats.free_dquots++;
-}
-
-static inline void remove_free_dquot(struct dquot *dquot)
-{
-	if (list_empty(&dquot->dq_free))
-		return;
-	list_del_init(&dquot->dq_free);
-	dqstats.free_dquots--;
-}
-
-static inline void put_inuse(struct dquot *dquot)
-{
-	/* We add to the back of inuse list so we don't have to restart
-	 * when traversing this list and we block */
-	list_add_tail(&dquot->dq_inuse, &inuse_list);
-	dqstats.allocated_dquots++;
-}
-
-static inline void remove_inuse(struct dquot *dquot)
-{
-	dqstats.allocated_dquots--;
-	list_del(&dquot->dq_inuse);
-}
-/*
- * End of list functions needing dq_list_lock
- */
-
-static void wait_on_dquot(struct dquot *dquot)
-{
-	mutex_lock(&dquot->dq_lock);
-	mutex_unlock(&dquot->dq_lock);
-}
-
-static inline int dquot_dirty(struct dquot *dquot)
-{
-	return test_bit(DQ_MOD_B, &dquot->dq_flags);
-}
-
-static inline int mark_dquot_dirty(struct dquot *dquot)
-{
-	return dquot->dq_sb->dq_op->mark_dirty(dquot);
-}
-
-int dquot_mark_dquot_dirty(struct dquot *dquot)
-{
-	spin_lock(&dq_list_lock);
-	if (!test_and_set_bit(DQ_MOD_B, &dquot->dq_flags))
-		list_add(&dquot->dq_dirty, &sb_dqopt(dquot->dq_sb)->
-				info[dquot->dq_type].dqi_dirty_list);
-	spin_unlock(&dq_list_lock);
-	return 0;
-}
-EXPORT_SYMBOL(dquot_mark_dquot_dirty);
-
-/* This function needs dq_list_lock */
-static inline int clear_dquot_dirty(struct dquot *dquot)
-{
-	if (!test_and_clear_bit(DQ_MOD_B, &dquot->dq_flags))
-		return 0;
-	list_del_init(&dquot->dq_dirty);
-	return 1;
-}
-
-void mark_info_dirty(struct super_block *sb, int type)
-{
-	set_bit(DQF_INFO_DIRTY_B, &sb_dqopt(sb)->info[type].dqi_flags);
-}
-EXPORT_SYMBOL(mark_info_dirty);
-
-/*
- *	Read dquot from disk and alloc space for it
- */
-
-int dquot_acquire(struct dquot *dquot)
-{
-	int ret = 0, ret2 = 0;
-	struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
-
-	mutex_lock(&dquot->dq_lock);
-	mutex_lock(&dqopt->dqio_mutex);
-	if (!test_bit(DQ_READ_B, &dquot->dq_flags))
-		ret = dqopt->ops[dquot->dq_type]->read_dqblk(dquot);
-	if (ret < 0)
-		goto out_iolock;
-	set_bit(DQ_READ_B, &dquot->dq_flags);
-	/* Instantiate dquot if needed */
-	if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && !dquot->dq_off) {
-		ret = dqopt->ops[dquot->dq_type]->commit_dqblk(dquot);
-		/* Write the info if needed */
-		if (info_dirty(&dqopt->info[dquot->dq_type]))
-			ret2 = dqopt->ops[dquot->dq_type]->write_file_info(dquot->dq_sb, dquot->dq_type);
-		if (ret < 0)
-			goto out_iolock;
-		if (ret2 < 0) {
-			ret = ret2;
-			goto out_iolock;
-		}
-	}
-	set_bit(DQ_ACTIVE_B, &dquot->dq_flags);
-out_iolock:
-	mutex_unlock(&dqopt->dqio_mutex);
-	mutex_unlock(&dquot->dq_lock);
-	return ret;
-}
-EXPORT_SYMBOL(dquot_acquire);
-
-/*
- *	Write dquot to disk
- */
-int dquot_commit(struct dquot *dquot)
-{
-	int ret = 0, ret2 = 0;
-	struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
-
-	mutex_lock(&dqopt->dqio_mutex);
-	spin_lock(&dq_list_lock);
-	if (!clear_dquot_dirty(dquot)) {
-		spin_unlock(&dq_list_lock);
-		goto out_sem;
-	}
-	spin_unlock(&dq_list_lock);
-	/* Inactive dquot can be only if there was error during read/init
-	 * => we have better not writing it */
-	if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) {
-		ret = dqopt->ops[dquot->dq_type]->commit_dqblk(dquot);
-		if (info_dirty(&dqopt->info[dquot->dq_type]))
-			ret2 = dqopt->ops[dquot->dq_type]->write_file_info(dquot->dq_sb, dquot->dq_type);
-		if (ret >= 0)
-			ret = ret2;
-	}
-out_sem:
-	mutex_unlock(&dqopt->dqio_mutex);
-	return ret;
-}
-EXPORT_SYMBOL(dquot_commit);
-
-/*
- *	Release dquot
- */
-int dquot_release(struct dquot *dquot)
-{
-	int ret = 0, ret2 = 0;
-	struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
-
-	mutex_lock(&dquot->dq_lock);
-	/* Check whether we are not racing with some other dqget() */
-	if (atomic_read(&dquot->dq_count) > 1)
-		goto out_dqlock;
-	mutex_lock(&dqopt->dqio_mutex);
-	if (dqopt->ops[dquot->dq_type]->release_dqblk) {
-		ret = dqopt->ops[dquot->dq_type]->release_dqblk(dquot);
-		/* Write the info */
-		if (info_dirty(&dqopt->info[dquot->dq_type]))
-			ret2 = dqopt->ops[dquot->dq_type]->write_file_info(dquot->dq_sb, dquot->dq_type);
-		if (ret >= 0)
-			ret = ret2;
-	}
-	clear_bit(DQ_ACTIVE_B, &dquot->dq_flags);
-	mutex_unlock(&dqopt->dqio_mutex);
-out_dqlock:
-	mutex_unlock(&dquot->dq_lock);
-	return ret;
-}
-EXPORT_SYMBOL(dquot_release);
-
-void dquot_destroy(struct dquot *dquot)
-{
-	kmem_cache_free(dquot_cachep, dquot);
-}
-EXPORT_SYMBOL(dquot_destroy);
-
-static inline void do_destroy_dquot(struct dquot *dquot)
-{
-	dquot->dq_sb->dq_op->destroy_dquot(dquot);
-}
-
-/* Invalidate all dquots on the list. Note that this function is called after
- * quota is disabled and pointers from inodes removed so there cannot be new
- * quota users. There can still be some users of quotas due to inodes being
- * just deleted or pruned by prune_icache() (those are not attached to any
- * list) or parallel quotactl call. We have to wait for such users.
- */
-static void invalidate_dquots(struct super_block *sb, int type)
-{
-	struct dquot *dquot, *tmp;
-
-restart:
-	spin_lock(&dq_list_lock);
-	list_for_each_entry_safe(dquot, tmp, &inuse_list, dq_inuse) {
-		if (dquot->dq_sb != sb)
-			continue;
-		if (dquot->dq_type != type)
-			continue;
-		/* Wait for dquot users */
-		if (atomic_read(&dquot->dq_count)) {
-			DEFINE_WAIT(wait);
-
-			atomic_inc(&dquot->dq_count);
-			prepare_to_wait(&dquot->dq_wait_unused, &wait,
-					TASK_UNINTERRUPTIBLE);
-			spin_unlock(&dq_list_lock);
-			/* Once dqput() wakes us up, we know it's time to free
-			 * the dquot.
-			 * IMPORTANT: we rely on the fact that there is always
-			 * at most one process waiting for dquot to free.
-			 * Otherwise dq_count would be > 1 and we would never
-			 * wake up.
-			 */
-			if (atomic_read(&dquot->dq_count) > 1)
-				schedule();
-			finish_wait(&dquot->dq_wait_unused, &wait);
-			dqput(dquot);
-			/* At this moment dquot() need not exist (it could be
-			 * reclaimed by prune_dqcache(). Hence we must
-			 * restart. */
-			goto restart;
-		}
-		/*
-		 * Quota now has no users and it has been written on last
-		 * dqput()
-		 */
-		remove_dquot_hash(dquot);
-		remove_free_dquot(dquot);
-		remove_inuse(dquot);
-		do_destroy_dquot(dquot);
-	}
-	spin_unlock(&dq_list_lock);
-}
-
-/* Call callback for every active dquot on given filesystem */
-int dquot_scan_active(struct super_block *sb,
-		      int (*fn)(struct dquot *dquot, unsigned long priv),
-		      unsigned long priv)
-{
-	struct dquot *dquot, *old_dquot = NULL;
-	int ret = 0;
-
-	mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
-	spin_lock(&dq_list_lock);
-	list_for_each_entry(dquot, &inuse_list, dq_inuse) {
-		if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags))
-			continue;
-		if (dquot->dq_sb != sb)
-			continue;
-		/* Now we have active dquot so we can just increase use count */
-		atomic_inc(&dquot->dq_count);
-		dqstats.lookups++;
-		spin_unlock(&dq_list_lock);
-		dqput(old_dquot);
-		old_dquot = dquot;
-		ret = fn(dquot, priv);
-		if (ret < 0)
-			goto out;
-		spin_lock(&dq_list_lock);
-		/* We are safe to continue now because our dquot could not
-		 * be moved out of the inuse list while we hold the reference */
-	}
-	spin_unlock(&dq_list_lock);
-out:
-	dqput(old_dquot);
-	mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
-	return ret;
-}
-EXPORT_SYMBOL(dquot_scan_active);
-
-int vfs_quota_sync(struct super_block *sb, int type)
-{
-	struct list_head *dirty;
-	struct dquot *dquot;
-	struct quota_info *dqopt = sb_dqopt(sb);
-	int cnt;
-
-	mutex_lock(&dqopt->dqonoff_mutex);
-	for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
-		if (type != -1 && cnt != type)
-			continue;
-		if (!sb_has_quota_active(sb, cnt))
-			continue;
-		spin_lock(&dq_list_lock);
-		dirty = &dqopt->info[cnt].dqi_dirty_list;
-		while (!list_empty(dirty)) {
-			dquot = list_first_entry(dirty, struct dquot, dq_dirty);
-			/* Dirty and inactive can be only bad dquot... */
-			if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) {
-				clear_dquot_dirty(dquot);
-				continue;
-			}
-			/* Now we have active dquot from which someone is
- 			 * holding reference so we can safely just increase
-			 * use count */
-			atomic_inc(&dquot->dq_count);
-			dqstats.lookups++;
-			spin_unlock(&dq_list_lock);
-			sb->dq_op->write_dquot(dquot);
-			dqput(dquot);
-			spin_lock(&dq_list_lock);
-		}
-		spin_unlock(&dq_list_lock);
-	}
-
-	for (cnt = 0; cnt < MAXQUOTAS; cnt++)
-		if ((cnt == type || type == -1) && sb_has_quota_active(sb, cnt)
-		    && info_dirty(&dqopt->info[cnt]))
-			sb->dq_op->write_info(sb, cnt);
-	spin_lock(&dq_list_lock);
-	dqstats.syncs++;
-	spin_unlock(&dq_list_lock);
-	mutex_unlock(&dqopt->dqonoff_mutex);
-
-	return 0;
-}
-EXPORT_SYMBOL(vfs_quota_sync);
-
-/* Free unused dquots from cache */
-static void prune_dqcache(int count)
-{
-	struct list_head *head;
-	struct dquot *dquot;
-
-	head = free_dquots.prev;
-	while (head != &free_dquots && count) {
-		dquot = list_entry(head, struct dquot, dq_free);
-		remove_dquot_hash(dquot);
-		remove_free_dquot(dquot);
-		remove_inuse(dquot);
-		do_destroy_dquot(dquot);
-		count--;
-		head = free_dquots.prev;
-	}
-}
-
-/*
- * This is called from kswapd when we think we need some
- * more memory
- */
-
-static int shrink_dqcache_memory(int nr, gfp_t gfp_mask)
-{
-	if (nr) {
-		spin_lock(&dq_list_lock);
-		prune_dqcache(nr);
-		spin_unlock(&dq_list_lock);
-	}
-	return (dqstats.free_dquots / 100) * sysctl_vfs_cache_pressure;
-}
-
-static struct shrinker dqcache_shrinker = {
-	.shrink = shrink_dqcache_memory,
-	.seeks = DEFAULT_SEEKS,
-};
-
-/*
- * Put reference to dquot
- * NOTE: If you change this function please check whether dqput_blocks() works right...
- */
-void dqput(struct dquot *dquot)
-{
-	int ret;
-
-	if (!dquot)
-		return;
-#ifdef __DQUOT_PARANOIA
-	if (!atomic_read(&dquot->dq_count)) {
-		printk("VFS: dqput: trying to free free dquot\n");
-		printk("VFS: device %s, dquot of %s %d\n",
-			dquot->dq_sb->s_id,
-			quotatypes[dquot->dq_type],
-			dquot->dq_id);
-		BUG();
-	}
-#endif
-	
-	spin_lock(&dq_list_lock);
-	dqstats.drops++;
-	spin_unlock(&dq_list_lock);
-we_slept:
-	spin_lock(&dq_list_lock);
-	if (atomic_read(&dquot->dq_count) > 1) {
-		/* We have more than one user... nothing to do */
-		atomic_dec(&dquot->dq_count);
-		/* Releasing dquot during quotaoff phase? */
-		if (!sb_has_quota_active(dquot->dq_sb, dquot->dq_type) &&
-		    atomic_read(&dquot->dq_count) == 1)
-			wake_up(&dquot->dq_wait_unused);
-		spin_unlock(&dq_list_lock);
-		return;
-	}
-	/* Need to release dquot? */
-	if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && dquot_dirty(dquot)) {
-		spin_unlock(&dq_list_lock);
-		/* Commit dquot before releasing */
-		ret = dquot->dq_sb->dq_op->write_dquot(dquot);
-		if (ret < 0) {
-			printk(KERN_ERR "VFS: cannot write quota structure on "
-				"device %s (error %d). Quota may get out of "
-				"sync!\n", dquot->dq_sb->s_id, ret);
-			/*
-			 * We clear dirty bit anyway, so that we avoid
-			 * infinite loop here
-			 */
-			spin_lock(&dq_list_lock);
-			clear_dquot_dirty(dquot);
-			spin_unlock(&dq_list_lock);
-		}
-		goto we_slept;
-	}
-	/* Clear flag in case dquot was inactive (something bad happened) */
-	clear_dquot_dirty(dquot);
-	if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) {
-		spin_unlock(&dq_list_lock);
-		dquot->dq_sb->dq_op->release_dquot(dquot);
-		goto we_slept;
-	}
-	atomic_dec(&dquot->dq_count);
-#ifdef __DQUOT_PARANOIA
-	/* sanity check */
-	BUG_ON(!list_empty(&dquot->dq_free));
-#endif
-	put_dquot_last(dquot);
-	spin_unlock(&dq_list_lock);
-}
-EXPORT_SYMBOL(dqput);
-
-struct dquot *dquot_alloc(struct super_block *sb, int type)
-{
-	return kmem_cache_zalloc(dquot_cachep, GFP_NOFS);
-}
-EXPORT_SYMBOL(dquot_alloc);
-
-static struct dquot *get_empty_dquot(struct super_block *sb, int type)
-{
-	struct dquot *dquot;
-
-	dquot = sb->dq_op->alloc_dquot(sb, type);
-	if(!dquot)
-		return NODQUOT;
-
-	mutex_init(&dquot->dq_lock);
-	INIT_LIST_HEAD(&dquot->dq_free);
-	INIT_LIST_HEAD(&dquot->dq_inuse);
-	INIT_HLIST_NODE(&dquot->dq_hash);
-	INIT_LIST_HEAD(&dquot->dq_dirty);
-	init_waitqueue_head(&dquot->dq_wait_unused);
-	dquot->dq_sb = sb;
-	dquot->dq_type = type;
-	atomic_set(&dquot->dq_count, 1);
-
-	return dquot;
-}
-
-/*
- * Get reference to dquot
- *
- * Locking is slightly tricky here. We are guarded from parallel quotaoff()
- * destroying our dquot by:
- *   a) checking for quota flags under dq_list_lock and
- *   b) getting a reference to dquot before we release dq_list_lock
- */
-struct dquot *dqget(struct super_block *sb, unsigned int id, int type)
-{
-	unsigned int hashent = hashfn(sb, id, type);
-	struct dquot *dquot = NODQUOT, *empty = NODQUOT;
-
-        if (!sb_has_quota_active(sb, type))
-		return NODQUOT;
-we_slept:
-	spin_lock(&dq_list_lock);
-	spin_lock(&dq_state_lock);
-	if (!sb_has_quota_active(sb, type)) {
-		spin_unlock(&dq_state_lock);
-		spin_unlock(&dq_list_lock);
-		goto out;
-	}
-	spin_unlock(&dq_state_lock);
-
-	if ((dquot = find_dquot(hashent, sb, id, type)) == NODQUOT) {
-		if (empty == NODQUOT) {
-			spin_unlock(&dq_list_lock);
-			if ((empty = get_empty_dquot(sb, type)) == NODQUOT)
-				schedule();	/* Try to wait for a moment... */
-			goto we_slept;
-		}
-		dquot = empty;
-		empty = NODQUOT;
-		dquot->dq_id = id;
-		/* all dquots go on the inuse_list */
-		put_inuse(dquot);
-		/* hash it first so it can be found */
-		insert_dquot_hash(dquot);
-		dqstats.lookups++;
-		spin_unlock(&dq_list_lock);
-	} else {
-		if (!atomic_read(&dquot->dq_count))
-			remove_free_dquot(dquot);
-		atomic_inc(&dquot->dq_count);
-		dqstats.cache_hits++;
-		dqstats.lookups++;
-		spin_unlock(&dq_list_lock);
-	}
-	/* Wait for dq_lock - after this we know that either dquot_release() is already
-	 * finished or it will be canceled due to dq_count > 1 test */
-	wait_on_dquot(dquot);
-	/* Read the dquot and instantiate it (everything done only if needed) */
-	if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && sb->dq_op->acquire_dquot(dquot) < 0) {
-		dqput(dquot);
-		dquot = NODQUOT;
-		goto out;
-	}
-#ifdef __DQUOT_PARANOIA
-	BUG_ON(!dquot->dq_sb);	/* Has somebody invalidated entry under us? */
-#endif
-out:
-	if (empty)
-		do_destroy_dquot(empty);
-
-	return dquot;
-}
-EXPORT_SYMBOL(dqget);
-
-static int dqinit_needed(struct inode *inode, int type)
-{
-	int cnt;
-
-	if (IS_NOQUOTA(inode))
-		return 0;
-	if (type != -1)
-		return inode->i_dquot[type] == NODQUOT;
-	for (cnt = 0; cnt < MAXQUOTAS; cnt++)
-		if (inode->i_dquot[cnt] == NODQUOT)
-			return 1;
-	return 0;
-}
-
-/* This routine is guarded by dqonoff_mutex mutex */
-static void add_dquot_ref(struct super_block *sb, int type)
-{
-	struct inode *inode, *old_inode = NULL;
-
-	spin_lock(&inode_lock);
-	list_for_each_entry(inode, &sb->s_inodes, i_sb_list) {
-		if (!atomic_read(&inode->i_writecount))
-			continue;
-		if (!dqinit_needed(inode, type))
-			continue;
-		if (inode->i_state & (I_FREEING|I_WILL_FREE))
-			continue;
-
-		__iget(inode);
-		spin_unlock(&inode_lock);
-
-		iput(old_inode);
-		sb->dq_op->initialize(inode, type);
-		/* We hold a reference to 'inode' so it couldn't have been
-		 * removed from s_inodes list while we dropped the inode_lock.
-		 * We cannot iput the inode now as we can be holding the last
-		 * reference and we cannot iput it under inode_lock. So we
-		 * keep the reference and iput it later. */
-		old_inode = inode;
-		spin_lock(&inode_lock);
-	}
-	spin_unlock(&inode_lock);
-	iput(old_inode);
-}
-
-/* Return 0 if dqput() won't block (note that 1 doesn't necessarily mean blocking) */
-static inline int dqput_blocks(struct dquot *dquot)
-{
-	if (atomic_read(&dquot->dq_count) <= 1)
-		return 1;
-	return 0;
-}
-
-/* Remove references to dquots from inode - add dquot to list for freeing if needed */
-/* We can't race with anybody because we hold dqptr_sem for writing... */
-static int remove_inode_dquot_ref(struct inode *inode, int type,
-				  struct list_head *tofree_head)
-{
-	struct dquot *dquot = inode->i_dquot[type];
-
-	inode->i_dquot[type] = NODQUOT;
-	if (dquot != NODQUOT) {
-		if (dqput_blocks(dquot)) {
-#ifdef __DQUOT_PARANOIA
-			if (atomic_read(&dquot->dq_count) != 1)
-				printk(KERN_WARNING "VFS: Adding dquot with dq_count %d to dispose list.\n", atomic_read(&dquot->dq_count));
-#endif
-			spin_lock(&dq_list_lock);
-			list_add(&dquot->dq_free, tofree_head);	/* As dquot must have currently users it can't be on the free list... */
-			spin_unlock(&dq_list_lock);
-			return 1;
-		}
-		else
-			dqput(dquot);   /* We have guaranteed we won't block */
-	}
-	return 0;
-}
-
-/* Free list of dquots - called from inode.c */
-/* dquots are removed from inodes, no new references can be got so we are the only ones holding reference */
-static void put_dquot_list(struct list_head *tofree_head)
-{
-	struct list_head *act_head;
-	struct dquot *dquot;
-
-	act_head = tofree_head->next;
-	/* So now we have dquots on the list... Just free them */
-	while (act_head != tofree_head) {
-		dquot = list_entry(act_head, struct dquot, dq_free);
-		act_head = act_head->next;
-		list_del_init(&dquot->dq_free);	/* Remove dquot from the list so we won't have problems... */
-		dqput(dquot);
-	}
-}
-
-static void remove_dquot_ref(struct super_block *sb, int type,
-		struct list_head *tofree_head)
-{
-	struct inode *inode;
-
-	spin_lock(&inode_lock);
-	list_for_each_entry(inode, &sb->s_inodes, i_sb_list) {
-		if (!IS_NOQUOTA(inode))
-			remove_inode_dquot_ref(inode, type, tofree_head);
-	}
-	spin_unlock(&inode_lock);
-}
-
-/* Gather all references from inodes and drop them */
-static void drop_dquot_ref(struct super_block *sb, int type)
-{
-	LIST_HEAD(tofree_head);
-
-	if (sb->dq_op) {
-		down_write(&sb_dqopt(sb)->dqptr_sem);
-		remove_dquot_ref(sb, type, &tofree_head);
-		up_write(&sb_dqopt(sb)->dqptr_sem);
-		put_dquot_list(&tofree_head);
-	}
-}
-
-static inline void dquot_incr_inodes(struct dquot *dquot, qsize_t number)
-{
-	dquot->dq_dqb.dqb_curinodes += number;
-}
-
-static inline void dquot_incr_space(struct dquot *dquot, qsize_t number)
-{
-	dquot->dq_dqb.dqb_curspace += number;
-}
-
-static inline void dquot_resv_space(struct dquot *dquot, qsize_t number)
-{
-	dquot->dq_dqb.dqb_rsvspace += number;
-}
-
-/*
- * Claim reserved quota space
- */
-static void dquot_claim_reserved_space(struct dquot *dquot,
-						qsize_t number)
-{
-	WARN_ON(dquot->dq_dqb.dqb_rsvspace < number);
-	dquot->dq_dqb.dqb_curspace += number;
-	dquot->dq_dqb.dqb_rsvspace -= number;
-}
-
-static inline
-void dquot_free_reserved_space(struct dquot *dquot, qsize_t number)
-{
-	dquot->dq_dqb.dqb_rsvspace -= number;
-}
-
-static inline void dquot_decr_inodes(struct dquot *dquot, qsize_t number)
-{
-	if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE ||
-	    dquot->dq_dqb.dqb_curinodes >= number)
-		dquot->dq_dqb.dqb_curinodes -= number;
-	else
-		dquot->dq_dqb.dqb_curinodes = 0;
-	if (dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit)
-		dquot->dq_dqb.dqb_itime = (time_t) 0;
-	clear_bit(DQ_INODES_B, &dquot->dq_flags);
-}
-
-static inline void dquot_decr_space(struct dquot *dquot, qsize_t number)
-{
-	if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE ||
-	    dquot->dq_dqb.dqb_curspace >= number)
-		dquot->dq_dqb.dqb_curspace -= number;
-	else
-		dquot->dq_dqb.dqb_curspace = 0;
-	if (dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit)
-		dquot->dq_dqb.dqb_btime = (time_t) 0;
-	clear_bit(DQ_BLKS_B, &dquot->dq_flags);
-}
-
-static int warning_issued(struct dquot *dquot, const int warntype)
-{
-	int flag = (warntype == QUOTA_NL_BHARDWARN ||
-		warntype == QUOTA_NL_BSOFTLONGWARN) ? DQ_BLKS_B :
-		((warntype == QUOTA_NL_IHARDWARN ||
-		warntype == QUOTA_NL_ISOFTLONGWARN) ? DQ_INODES_B : 0);
-
-	if (!flag)
-		return 0;
-	return test_and_set_bit(flag, &dquot->dq_flags);
-}
-
-#ifdef CONFIG_PRINT_QUOTA_WARNING
-static int flag_print_warnings = 1;
-
-static inline int need_print_warning(struct dquot *dquot)
-{
-	if (!flag_print_warnings)
-		return 0;
-
-	switch (dquot->dq_type) {
-		case USRQUOTA:
-			return current_fsuid() == dquot->dq_id;
-		case GRPQUOTA:
-			return in_group_p(dquot->dq_id);
-	}
-	return 0;
-}
-
-/* Print warning to user which exceeded quota */
-static void print_warning(struct dquot *dquot, const int warntype)
-{
-	char *msg = NULL;
-	struct tty_struct *tty;
-
-	if (warntype == QUOTA_NL_IHARDBELOW ||
-	    warntype == QUOTA_NL_ISOFTBELOW ||
-	    warntype == QUOTA_NL_BHARDBELOW ||
-	    warntype == QUOTA_NL_BSOFTBELOW || !need_print_warning(dquot))
-		return;
-
-	tty = get_current_tty();
-	if (!tty)
-		return;
-	tty_write_message(tty, dquot->dq_sb->s_id);
-	if (warntype == QUOTA_NL_ISOFTWARN || warntype == QUOTA_NL_BSOFTWARN)
-		tty_write_message(tty, ": warning, ");
-	else
-		tty_write_message(tty, ": write failed, ");
-	tty_write_message(tty, quotatypes[dquot->dq_type]);
-	switch (warntype) {
-		case QUOTA_NL_IHARDWARN:
-			msg = " file limit reached.\r\n";
-			break;
-		case QUOTA_NL_ISOFTLONGWARN:
-			msg = " file quota exceeded too long.\r\n";
-			break;
-		case QUOTA_NL_ISOFTWARN:
-			msg = " file quota exceeded.\r\n";
-			break;
-		case QUOTA_NL_BHARDWARN:
-			msg = " block limit reached.\r\n";
-			break;
-		case QUOTA_NL_BSOFTLONGWARN:
-			msg = " block quota exceeded too long.\r\n";
-			break;
-		case QUOTA_NL_BSOFTWARN:
-			msg = " block quota exceeded.\r\n";
-			break;
-	}
-	tty_write_message(tty, msg);
-	tty_kref_put(tty);
-}
-#endif
-
-#ifdef CONFIG_QUOTA_NETLINK_INTERFACE
-
-/* Netlink family structure for quota */
-static struct genl_family quota_genl_family = {
-	.id = GENL_ID_GENERATE,
-	.hdrsize = 0,
-	.name = "VFS_DQUOT",
-	.version = 1,
-	.maxattr = QUOTA_NL_A_MAX,
-};
-
-/* Send warning to userspace about user which exceeded quota */
-static void send_warning(const struct dquot *dquot, const char warntype)
-{
-	static atomic_t seq;
-	struct sk_buff *skb;
-	void *msg_head;
-	int ret;
-	int msg_size = 4 * nla_total_size(sizeof(u32)) +
-		       2 * nla_total_size(sizeof(u64));
-
-	/* We have to allocate using GFP_NOFS as we are called from a
-	 * filesystem performing write and thus further recursion into
-	 * the fs to free some data could cause deadlocks. */
-	skb = genlmsg_new(msg_size, GFP_NOFS);
-	if (!skb) {
-		printk(KERN_ERR
-		  "VFS: Not enough memory to send quota warning.\n");
-		return;
-	}
-	msg_head = genlmsg_put(skb, 0, atomic_add_return(1, &seq),
-			&quota_genl_family, 0, QUOTA_NL_C_WARNING);
-	if (!msg_head) {
-		printk(KERN_ERR
-		  "VFS: Cannot store netlink header in quota warning.\n");
-		goto err_out;
-	}
-	ret = nla_put_u32(skb, QUOTA_NL_A_QTYPE, dquot->dq_type);
-	if (ret)
-		goto attr_err_out;
-	ret = nla_put_u64(skb, QUOTA_NL_A_EXCESS_ID, dquot->dq_id);
-	if (ret)
-		goto attr_err_out;
-	ret = nla_put_u32(skb, QUOTA_NL_A_WARNING, warntype);
-	if (ret)
-		goto attr_err_out;
-	ret = nla_put_u32(skb, QUOTA_NL_A_DEV_MAJOR,
-		MAJOR(dquot->dq_sb->s_dev));
-	if (ret)
-		goto attr_err_out;
-	ret = nla_put_u32(skb, QUOTA_NL_A_DEV_MINOR,
-		MINOR(dquot->dq_sb->s_dev));
-	if (ret)
-		goto attr_err_out;
-	ret = nla_put_u64(skb, QUOTA_NL_A_CAUSED_ID, current_uid());
-	if (ret)
-		goto attr_err_out;
-	genlmsg_end(skb, msg_head);
-
-	ret = genlmsg_multicast(skb, 0, quota_genl_family.i