Release 4.11 fs/quota/dquot.c

/*
 * 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/sched.h>
#include <linux/cred.h>
#include <linux/kmod.h>
#include <linux/namei.h>
#include <linux/capability.h>
#include <linux/quotaops.h>
#include "../internal.h" /* ugh */

#include <linux/uaccess.h>

/*
 * There are three quota SMP locks. dq_list_lock protects all lists with quotas
 * and quota formats.
 * 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
 *
 * Operation accessing dquots via inode pointers are protected by dquot_srcu.
 * Operation of reading pointer needs srcu_read_lock(&dquot_srcu), and
 * synchronize_srcu(&dquot_srcu) is called after clearing pointers from
 * inode and before dropping dquot references to avoid use of dquots after
 * they are freed. dq_data_lock is used to serialize the pointer setting and
 * clearing operations.
 * 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 dq_data_lock and then (if S_NOQUOTA is not set) they
 * have to do all pointer modifications before dropping dq_data_lock. 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).
 * 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:
 *   s_umount > i_mutex > journal_lock > dquot->dq_lock > dqio_mutex
 */

static __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_list_lock);
static __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_state_lock);
__cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_data_lock);

EXPORT_SYMBOL(dq_data_lock);

DEFINE_STATIC_SRCU(dquot_srcu);



void __quota_error(struct super_block *sb, const char *func,
		   const char *fmt, ...)
{
	if (printk_ratelimit()) {
		va_list args;
		struct va_format vaf;

		va_start(args, fmt);

		vaf.fmt = fmt;
		vaf.va = &args;

		printk(KERN_ERR "Quota error (device %s): %s: %pV\n",
		       sb->s_id, func, &vaf);

		va_end(args);
	}
}
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EXPORT_SYMBOL(__quota_error);

#if defined(CONFIG_QUOTA_DEBUG) || defined(CONFIG_PRINT_QUOTA_WARNING)

static char *quotatypes[] = INITQFNAMES;
#endif

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;
}
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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);
}
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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;
}

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38.69%
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Christoph Hellwig
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Linus Torvalds (pre-git)
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1
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static void put_quota_format(struct quota_format_type *fmt)
{
	module_put(fmt->qf_owner);
}

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/*
 * 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 qsize_t inode_get_rsv_space(struct inode *inode);
static int __dquot_initialize(struct inode *inode, int type);


static inline unsigned int

hashfn(const struct super_block *sb, struct kqid qid)
{
	unsigned int id = from_kqid(&init_user_ns, qid);
	int type = qid.type;
	unsigned long tmp;

	tmp = (((unsigned long)sb>>L1_CACHE_SHIFT) ^ id) * (MAXQUOTAS - type);
	return (tmp + (tmp >> dq_hash_bits)) & dq_hash_mask;
}

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Eric W. Biedermann
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Andrew Morton
14
18.42%
1
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Al Viro
8
10.53%
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Mika Kukkonen
6
7.89%
1
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Linus Torvalds
5
6.58%
1
12.50%
Jan Kara
1
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1
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8
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/*
 * Following list functions expect dq_list_lock to be held
 */


static inline void insert_dquot_hash(struct dquot *dquot)
{
	struct hlist_head *head;
	head = dquot_hash + hashfn(dquot->dq_sb, dquot->dq_id);
	hlist_add_head(&dquot->dq_hash, head);
}

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Linus Torvalds
7
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2
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Jan Kara
4
9.52%
1
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Andrew Morton
2
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static inline void remove_dquot_hash(struct dquot *dquot)
{
	hlist_del_init(&dquot->dq_hash);
}

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static struct dquot *find_dquot(unsigned int hashent, struct super_block *sb,
				struct kqid qid)
{
	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 && qid_eq(dquot->dq_id, qid))
			return dquot;
	}
	return NULL;
}

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Linus Torvalds (pre-git)
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Linus Torvalds
23
31.08%
2
28.57%
Andrew Morton
10
13.51%
1
14.29%
Eric W. Biedermann
7
9.46%
1
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Jan Kara
1
1.35%
1
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/* 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_inc(DQST_FREE_DQUOTS);
}

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Linus Torvalds (pre-git)
22
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Dmitriy Monakhov
4
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Akinobu Mita
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static inline void remove_free_dquot(struct dquot *dquot)
{
	if (list_empty(&dquot->dq_free))
		return;
	list_del_init(&dquot->dq_free);
	dqstats_dec(DQST_FREE_DQUOTS);
}

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31
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4
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Dmitriy Monakhov
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Dave Jones
1
2.78%
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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_inc(DQST_ALLOC_DQUOTS);
}

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Linus Torvalds
7
24.14%
1
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Dmitriy Monakhov
4
13.79%
1
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Akinobu Mita
2
6.90%
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static inline void remove_inuse(struct dquot *dquot)
{
	dqstats_dec(DQST_ALLOC_DQUOTS);
	list_del(&dquot->dq_inuse);
}
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/*
 * 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);
}

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Andrew Morton
3
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Ingo Molnar
2
7.41%
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static inline int dquot_dirty(struct dquot *dquot)
{
	return test_bit(DQ_MOD_B, &dquot->dq_flags);
}

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static inline int mark_dquot_dirty(struct dquot *dquot)
{
	return dquot->dq_sb->dq_op->mark_dirty(dquot);
}

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/* Mark dquot dirty in atomic manner, and return it's old dirty flag state */


int dquot_mark_dquot_dirty(struct dquot *dquot)
{
	int ret = 1;

	/* If quota is dirty already, we don't have to acquire dq_list_lock */
	if (test_bit(DQ_MOD_B, &dquot->dq_flags))
		return 1;

	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_id.type].dqi_dirty_list);
		ret = 0;
	}
	spin_unlock(&dq_list_lock);
	return ret;
}
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Andrew Morton
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28
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Eric W. Biedermann
3
3.26%
1
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EXPORT_SYMBOL(dquot_mark_dquot_dirty);

/* Dirtify all the dquots - this can block when journalling */


static inline int mark_all_dquot_dirty(struct dquot * const *dquot)
{
	int ret, err, cnt;

	ret = err = 0;
	for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
		if (dquot[cnt])
			/* Even in case of error we have to continue */
			ret = mark_dquot_dirty(dquot[cnt]);
		if (!err)
			err = ret;
	}
	return err;
}

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static inline void dqput_all(struct dquot **dquot)
{
	unsigned int cnt;

	for (cnt = 0; cnt < MAXQUOTAS; cnt++)
		dqput(dquot[cnt]);
}

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/* 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;
}

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void mark_info_dirty(struct super_block *sb, int type)
{
	set_bit(DQF_INFO_DIRTY_B, &sb_dqopt(sb)->info[type].dqi_flags);
}
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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_id.type]->read_dqblk(dquot);
	if (ret < 0)
		goto out_iolock;
	/* Make sure flags update is visible after dquot has been filled */
	smp_mb__before_atomic();
	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_id.type]->commit_dqblk(dquot);
		/* Write the info if needed */
		if (info_dirty(&dqopt->info[dquot->dq_id.type])) {
			ret2 = dqopt->ops[dquot->dq_id.type]->write_file_info(
					dquot->dq_sb, dquot->dq_id.type);
		}
		if (ret < 0)
			goto out_iolock;
		if (ret2 < 0) {
			ret = ret2;
			goto out_iolock;
		}
	}
	/*
         * Make sure flags update is visible after on-disk struct has been
         * allocated. Paired with smp_rmb() in dqget().
         */
	smp_mb__before_atomic();
	set_bit(DQ_ACTIVE_B, &dquot->dq_flags);
out_iolock:
	mutex_unlock(&dqopt->dqio_mutex);
	mutex_unlock(&dquot->dq_lock);
	return ret;
}
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14.69%
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Linus Torvalds (pre-git)
29
11.84%
4
30.77%
Eric W. Biedermann
15
6.12%
1
7.69%
Linus Torvalds
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2.45%
1
7.69%
Ingo Molnar
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EXPORT_SYMBOL(dquot_acquire);

/*
 *      Write dquot to disk
 */


int dquot_commit(struct dquot *dquot)
{
	int ret = 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_id.type]->commit_dqblk(dquot);
	else
		ret = -EIO;
out_sem:
	mutex_unlock(&dqopt->dqio_mutex);
	return ret;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Andrew Morton
58
50.00%
3
27.27%
Jan Kara
37
31.90%
2
18.18%
Linus Torvalds (pre-git)
13
11.21%
3
27.27%
Ingo Molnar
4
3.45%
1
9.09%
Eric W. Biedermann
3
2.59%
1
9.09%
Linus Torvalds
1
0.86%
1
9.09%
Total
116
100.00%
11
100.00%


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_id.type]->release_dqblk) {
		ret = dqopt->ops[dquot->dq_id.type]->release_dqblk(dquot);
		/* Write the info */
		if (info_dirty(&dqopt->info[dquot->dq_id.type])) {
			ret2 = dqopt->ops[dquot->dq_id.type]->write_file_info(
						dquot->dq_sb, dquot->dq_id.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;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Andrew Morton
162
87.57%
3
50.00%
Eric W. Biedermann
15
8.11%
1
16.67%
Ingo Molnar
6
3.24%
1
16.67%
Jan Kara
2
1.08%
1
16.67%
Total
185
100.00%
6
100.00%


EXPORT_SYMBOL(dquot_release);



void dquot_destroy(struct dquot *dquot)
{
	kmem_cache_free(dquot_cachep, dquot);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Jan Kara
17
100.00%
1
100.00%
Total
17
100.00%
1
100.00%


EXPORT_SYMBOL(dquot_destroy);



static inline void do_destroy_dquot(struct dquot *dquot)
{
	dquot->dq_sb->dq_op->destroy_dquot(dquot);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jan Kara
23
100.00%
1
100.00%
Total
23
100.00%
1
100.00%

/* 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_id.type != type)
			continue;
		/* Wait for dquot users */
		if (atomic_read(&dquot->dq_count)) {
			DEFINE_WAIT(wait);

			dqgrab(dquot);
			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);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jan Kara
89
53.29%
5
35.71%
Linus Torvalds (pre-git)
40
23.95%
5
35.71%
Andrew Morton
15
8.98%
1
7.14%
Linus Torvalds
11
6.59%
1
7.14%
Domen Puncer
9
5.39%
1
7.14%
Eric W. Biedermann
3
1.80%
1
7.14%
Total
167
100.00%
14
100.00%

/* 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;

	WARN_ON_ONCE(!rwsem_is_locked(&sb->s_umount));

	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);
		spin_unlock(&dq_list_lock);
		dqstats_inc(DQST_LOOKUPS);
		dqput(old_dquot);
		old_dquot = dquot;
		/*
                 * ->release_dquot() can be racing with us. Our reference
                 * protects us from new calls to it so just wait for any
                 * outstanding call and recheck the DQ_ACTIVE_B after that.
                 */
		wait_on_dquot(dquot);
		if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) {
			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);
	return ret;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Jan Kara
181
97.31%
3
75.00%
Dmitriy Monakhov
5
2.69%
1
25.00%
Total
186
100.00%
4
100.00%


EXPORT_SYMBOL(dquot_scan_active);

/* Write all dquot structures to quota files */


int dquot_writeback_dquots(struct super_block *sb, int type)
{
	struct list_head *dirty;
	struct dquot *dquot;
	struct quota_info *dqopt = sb_dqopt(sb);
	int cnt;
	int err, ret = 0;

	WARN_ON_ONCE(!rwsem_is_locked(&sb->s_umount));

	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 */
			dqgrab(dquot);
			spin_unlock(&dq_list_lock);
			dqstats_inc(DQST_LOOKUPS);
			err = sb->dq_op->write_dquot(dquot);
			if (!ret && err)
				ret = err;
			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);
	dqstats_inc(DQST_SYNCS);

	return ret;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Andrew Morton
128
46.72%
6
26.09%
Jan Kara
95
34.67%
8
34.78%
Linus Torvalds (pre-git)
23
8.39%
4
17.39%
Linus Torvalds
18
6.57%
2
8.70%
Dmitriy Monakhov
7
2.55%
1
4.35%
Dave Jones
2
0.73%
1
4.35%
Pavel Emelyanov
1
0.36%
1
4.35%
Total
274
100.00%
23
100.00%


EXPORT_SYMBOL(dquot_writeback_dquots);

/* Write all dquot structures to disk and make them visible from userspace */


int dquot_quota_sync(struct super_block *sb, int type)
{
	struct quota_info *dqopt = sb_dqopt(sb);
	int cnt;
	int ret;

	ret = dquot_writeback_dquots(sb, type);
	if (ret)
		return ret;
	if (dqopt->flags & DQUOT_QUOTA_SYS_FILE)
		return 0;

	/* This is not very clever (and fast) but currently I don't know about
         * any other simple way of getting quota data to disk and we must get
         * them there for userspace to be visible... */
	if (sb->s_op->sync_fs)
		sb->s_op->sync_fs(sb, 1);
	sync_blockdev(sb->s_bdev);

	/*
         * Now when everything is written we can discard the pagecache so
         * that userspace sees the changes.
         */
	for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
		if (type != -1 && cnt != type)
			continue;
		if (!sb_has_quota_active(sb, cnt))
			continue;
		inode_lock(dqopt->files[cnt]);
		truncate_inode_pages(&dqopt->files[cnt]->i_data, 0);
		inode_unlock(dqopt->files[cnt]);
	}

	return 0;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Hellwig
106
66.25%
1
16.67%
Jan Kara
48
30.00%
2
33.33%
Al Viro
2
1.25%
1
16.67%
Linus Torvalds
2
1.25%
1
16.67%
Linus Torvalds (pre-git)
2
1.25%
1
16.67%
Total
160
100.00%
6
100.00%


EXPORT_SYMBOL(dquot_quota_sync);


static unsigned long

dqcache_shrink_scan(struct shrinker *shrink, struct shrink_control *sc)
{
	struct list_head *head;
	struct dquot *dquot;
	unsigned long freed = 0;

	spin_lock(&dq_list_lock);
	head = free_dquots.prev;
	while (head != &free_dquots && sc->nr_to_scan) {
		dquot = list_entry(head, struct dquot, dq_free);
		remove_dquot_hash(dquot);
		remove_free_dquot(dquot);
		remove_inuse(dquot);
		do_destroy_dquot(dquot);
		sc->nr_to_scan--;
		freed++;
		head = free_dquots.prev;
	}
	spin_unlock(&dq_list_lock);
	return freed;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds
70
61.95%
1
25.00%
Dave Chinner
30
26.55%
1
25.00%
Niu YaWei
12
10.62%
1
25.00%
Jan Kara
1
0.88%
1
25.00%
Total
113
100.00%
4
100.00%


static unsigned long

dqcache_shrink_count(struct shrinker *shrink, struct shrink_control *sc)
{
	return vfs_pressure_ratio(
	percpu_counter_read_positive(&dqstats.counter[DQST_FREE_DQUOTS]));
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Dmitriy Monakhov
10
31.25%
2
18.18%
Dave Chinner
8
25.00%
2
18.18%
Ying Han
4
12.50%
1
9.09%
Glauber de Oliveira Costa
3
9.38%
1
9.09%
Linus Torvalds
3
9.38%
1
9.09%
Andrew Morton
2
6.25%
2
18.18%
Linus Torvalds (pre-git)
2
6.25%
2
18.18%
Total
32
100.00%
11
100.00%


static struct shrinker dqcache_shrinker = {
	.count_objects = dqcache_shrink_count,
	.scan_objects = dqcache_shrink_scan,
	.seeks = DEFAULT_SEEKS,
};

/*
 * Put reference to dquot
 */


void dqput(struct dquot *dquot)
{
	int ret;

	if (!dquot)
		return;
#ifdef CONFIG_QUOTA_DEBUG
	if (!atomic_read(&dquot->dq_count)) {
		quota_error(dquot->dq_sb, "trying to free free dquot of %s %d",
			    quotatypes[dquot->dq_id.type],
			    from_kqid(&init_user_ns, dquot->dq_id));
		BUG();
	}
#endif
	dqstats_inc(DQST_DROPS);
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_id.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) {
			quota_error(dquot->dq_sb, "Can't write quota structure"
				    " (error %d). Quota may get out of sync!",
				    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 CONFIG_QUOTA_DEBUG
	/* sanity check */
	BUG_ON(!list_empty(&dquot->dq_free));
#endif
	put_dquot_last(dquot);
	spin_unlock(&dq_list_lock);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Andrew Morton
107
35.20%
5
25.00%
Jan Kara
92
30.26%
6
30.00%
Linus Torvalds (pre-git)
80
26.32%
4
20.00%
Eric W. Biedermann
12
3.95%
1
5.00%
Jiaying Zhang
7
2.30%
1
5.00%
Eric Sesterhenn / Snakebyte
3
0.99%
1
5.00%
Dmitriy Monakhov
2
0.66%
1
5.00%
Linus Torvalds
1
0.33%
1
5.00%
Total
304
100.00%
20
100.00%


EXPORT_SYMBOL(dqput);



struct dquot *dquot_alloc(struct super_block *sb, int type)
{
	return kmem_cache_zalloc(dquot_cachep, GFP_NOFS);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Jan Kara
23
100.00%
1
100.00%
Total
23
100.00%
1
100.00%


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 NULL;

	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_id = make_kqid_invalid(type);
	atomic_set(&dquot->dq_count, 1);

	return dquot;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
50
42.37%
4
25.00%
Jan Kara
34
28.81%
4
25.00%
Linus Torvalds
15
12.71%
2
12.50%
Andrew Morton
14
11.86%
3
18.75%
Eric W. Biedermann
4
3.39%
2
12.50%
Ingo Molnar
1
0.85%
1
6.25%
Total
118
100.00%
16
100.00%

/*
 * 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, struct kqid qid)
{
	unsigned int hashent = hashfn(sb, qid);
	struct dquot *dquot, *empty = NULL;

	if (!qid_has_mapping(sb->s_user_ns, qid))
		return ERR_PTR(-EINVAL);

        if (!sb_has_quota_active(sb, qid.type))
		return ERR_PTR(-ESRCH);
we_slept:
	spin_lock(&dq_list_lock);
	spin_lock(&dq_state_lock);
	if (!sb_has_quota_active(sb, qid.type)) {
		spin_unlock(&dq_state_lock);
		spin_unlock(&dq_list_lock);
		dquot = ERR_PTR(-ESRCH);
		goto out;
	}
	spin_unlock(&dq_state_lock);

	dquot = find_dquot(hashent, sb, qid);
	if (!dquot) {
		if (!empty) {
			spin_unlock(&dq_list_lock);
			empty = get_empty_dquot(sb, qid.type);
			if (!empty)
				schedule();	/* Try to wait for a moment... */
			goto we_slept;
		}
		dquot = empty;
		empty = NULL;
		dquot->dq_id = qid;
		/* all dquots go on the inuse_list */
		put_inuse(dquot);
		/* hash it first so it can be found */
		insert_dquot_hash(dquot);
		spin_unlock(&dq_list_lock);
		dqstats_inc(DQST_LOOKUPS);
	} else {
		if (!atomic_read(&dquot->dq_count))
			remove_free_dquot(dquot);
		atomic_inc(&dquot->dq_count);
		spin_unlock(&dq_list_lock);
		dqstats_inc(DQST_CACHE_HITS);
		dqstats_inc(DQST_LOOKUPS);
	}
	/* 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 / allocate space in quota file */
	if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) {
		int err;

		err = sb->dq_op->acquire_dquot(dquot);
		if (err < 0) {
			dqput(dquot);
			dquot = ERR_PTR(err);
			goto out;
		}
	}
	/*
         * Make sure following reads see filled structure - paired with
         * smp_mb__before_atomic() in dquot_acquire().
         */
	smp_rmb();
#ifdef CONFIG_QUOTA_DEBUG
	BUG_ON(!dquot->dq_sb);	/* Has somebody invalidated entry under us? */
#endif
out:
	if (empty)
		do_destroy_dquot(empty);

	return dquot;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Jan Kara
172
48.18%
9
37.50%
Andrew Morton
74
20.73%
3
12.50%
Linus Torvalds (pre-git)
54
15.13%
5
20.83%
Eric W. Biedermann
31
8.68%
4
16.67%
Dmitriy Monakhov
15
4.20%
1
4.17%
Linus Torvalds
7
1.96%
1
4.17%
Eric Sesterhenn / Snakebyte
4
1.12%
1
4.17%
Total
357
100.00%
24
100.00%


EXPORT_SYMBOL(dqget);



static inline struct dquot **i_dquot(struct inode *inode)
{
	return inode->i_sb->s_op->get_dquots(inode);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jan Kara
27
100.00%
1
100.00%
Total
27
100.00%
1
100.00%



static int dqinit_needed(struct inode *inode, int type)
{
	struct dquot * const *dquots;
	int cnt;

	if (IS_NOQUOTA(inode))
		return 0;

	dquots = i_dquot(inode);
	if (type != -1)
		return !dquots[type];
	for (cnt = 0; cnt < MAXQUOTAS; cnt++)
		if (!dquots[cnt])
			return 1;
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
62
75.61%
1
20.00%
Konstantin Khlebnikov
16
19.51%
1
20.00%
Jan Kara
3
3.66%
2
40.00%
Linus Torvalds
1
1.22%
1
20.00%
Total
82
100.00%
5
100.00%

/* This routine is guarded by s_umount semaphore */


static void add_dquot_ref(struct super_block *sb, int type)
{
	struct inode *inode, *old_inode = NULL;
#ifdef CONFIG_QUOTA_DEBUG
	int reserved = 0;
#endif

	spin_lock(&sb->s_inode_list_lock);
	list_for_each_entry(inode, &sb->s_inodes, i_sb_list) {
		spin_lock(&inode->i_lock);
		if ((inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW)) ||
		    !atomic_read(&inode->i_writecount) ||
		    !dqinit_needed(inode, type)) {
			spin_unlock(&inode->i_lock);
			continue;
		}
		__iget(inode);
		spin_unlock(&inode->i_lock);
		spin_unlock(&sb->s_inode_list_lock);

#ifdef CONFIG_QUOTA_DEBUG
		if (unlikely(inode_get_rsv_space(inode) > 0))
			reserved = 1;
#endif
		iput(old_inode);
		__dquot_initialize(inode, type);

		/*
                 * We hold a reference to 'inode' so it couldn't have been
                 * removed from s_inodes list while we dropped the
                 * s_inode_list_lock. We cannot iput the inode now as we can be
                 * holding the last reference and we cannot iput it under
                 * s_inode_list_lock. So we keep the reference and iput it
                 * later.
                 */
		old_inode = inode;
		spin_lock(&sb->s_inode_list_lock);
	}
	spin_unlock(&sb->s_inode_list_lock);
	iput(old_inode);

#ifdef CONFIG_QUOTA_DEBUG
	if (reserved) {
		quota_error(sb, "Writes happened before quota was turned on "
			"thus quota information is probably inconsistent. "
			"Please run quotacheck(8)");
	}
#endif
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jan Kara
84
41.18%
6
33.33%
Dave Chinner
50
24.51%
2
11.11%
Linus Torvalds (pre-git)
28
13.73%
4
22.22%
Christoph Hellwig
18
8.82%
2
11.11%
Nicholas Piggin
15
7.35%
1
5.56%
Jiaying Zhang
5
2.45%
1
5.56%
Linus Torvalds
2
0.98%
1
5.56%
Dave Jones
2
0.98%
1
5.56%
Total
204
100.00%
18
100.00%

/*
 * Remove references to dquots from inode and add dquot to list for freeing
 * if we have the last reference to dquot
 */


static void remove_inode_dquot_ref(struct inode *inode, int type,
				   struct list_head *tofree_head)
{
	struct dquot **dquots = i_dquot(inode);
	struct dquot *dquot = dquots[type];

	if (!dquot)
		return;

	dquots[type] = NULL;
	if (list_empty(&dquot->dq_free)) {
		/*
                 * The inode still has reference to dquot so it can't be in the
                 * free list
                 */
		spin_lock(&dq_list_lock);
		list_add(&dquot->dq_free, tofree_head);
		spin_unlock(&dq_list_lock);
	} else {
		/*
                 * Dquot is already in a list to put so we won't drop the last
                 * reference here.
                 */
		dqput(dquot);
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
53
54.64%
5
45.45%
Konstantin Khlebnikov
16
16.49%
1
9.09%
Andrew Morton
14
14.43%
1
9.09%
Niu YaWei
9
9.28%
1
9.09%
Jan Kara
4
4.12%
2
18.18%
Adrian Bunk
1
1.03%
1
9.09%
Total
97
100.00%
11
100.00%

/*
 * Free list of dquots
 * Dquots are removed from inodes and 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;
	while (act_head != tofree_head) {
		dquot = list_entry(act_head, struct dquot, dq_free);
		act_head = act_head->next;
		/* Remove dquot from the list so we won't have problems... */
		list_del_init(&dquot->dq_free);
		dqput(dquot);
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
58
86.57%
3
42.86%
Linus Torvalds
6
8.96%
1
14.29%
Andrew Morton
1
1.49%
1
14.29%
Dave Jones
1
1.49%
1
14.29%
Jan Kara
1
1.49%
1
14.29%
Total
67
100.00%
7
100.00%



static void remove_dquot_ref(struct super_block *sb, int type,
		struct list_head *tofree_head)
{
	struct inode *inode;
	int reserved = 0;

	spin_lock(&sb->s_inode_list_lock);
	list_for_each_entry(inode, &sb->s_inodes, i_sb_list) {
		/*
                 *  We have to scan also I_NEW inodes because they can already
                 *  have quota pointer initialized. Luckily, we need to touch
                 *  only quota pointers and these have separate locking
                 *  (dq_data_lock).
                 */
		spin_lock(&dq_data_lock);
		if (!IS_NOQUOTA(inode)) {
			if (unlikely(inode_get_rsv_space(inode) > 0))
				reserved = 1;
			remove_inode_dquot_ref(inode, type, tofree_head);
		}
		spin_unlock(&dq_data_lock);
	}
	spin_unlock(&sb->s_inode_list_lock);
#ifdef CONFIG_QUOTA_DEBUG
	if (reserved) {
		printk(KERN_WARNING "VFS (%s): Writes happened after quota"
			" was disabled thus quota information is probably "
			"inconsistent. Please run quotacheck(8).\n", sb->s_id);
	}
#endif
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Hellwig
61
48.41%
1
25.00%
Dmitriy Monakhov
46
36.51%
1
25.00%
Niu YaWei
13
10.32%
1
25.00%
Dave Chinner
6
4.76%
1
25.00%
Total
126
100.00%
4
100.00%

/* 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) {
		remove_dquot_ref(sb, type, &tofree_head);
		synchronize_srcu(&dquot_srcu);
		put_dquot_list(&tofree_head);
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Andrew Morton
39
79.59%
1
33.33%
Christoph Hellwig
8
16.33%
1
33.33%
Niu YaWei
2
4.08%
1
33.33%
Total
49
100.00%
3
100.00%



static inline void dquot_incr_inodes(struct dquot *dquot, qsize_t number)
{
	dquot->dq_dqb.dqb_curinodes += number;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
19
82.61%
2
50.00%
Jan Kara
4
17.39%
2
50.00%
Total
23
100.00%
4
100.00%



static inline void dquot_incr_space(struct dquot *dquot, qsize_t number)
{
	dquot->dq_dqb.dqb_curspace += number;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
18
78.26%
2
50.00%
Jan Kara
5
21.74%
2
50.00%
Total
23
100.00%
4
100.00%



static inline void dquot_resv_space(struct dquot *dquot, qsize_t number)
{
	dquot->dq_dqb.dqb_rsvspace += number;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Mingming Cao
23
100.00%
1
100.00%
Total
23
100.00%
1
100.00%

/*
 * Claim reserved quota space
 */


static void dquot_claim_reserved_space(struct dquot *dquot, qsize_t number)
{
	if (dquot->dq_dqb.dqb_rsvspace < number) {
		WARN_ON_ONCE(1);
		number = dquot->dq_dqb.dqb_rsvspace;
	}
	dquot->dq_dqb.dqb_curspace += number;
	dquot->dq_dqb.dqb_rsvspace -= number;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Mingming Cao
39
70.91%
1
50.00%
Jan Kara
16
29.09%
1
50.00%
Total
55
100.00%
2
100.00%



static void dquot_reclaim_reserved_space(struct dquot *dquot, qsize_t number)
{
	if (WARN_ON_ONCE(dquot->dq_dqb.dqb_curspace < number))
		number = dquot->dq_dqb.dqb_curspace;
	dquot->dq_dqb.dqb_rsvspace += number;
	dquot->dq_dqb.dqb_curspace -= number;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jan Kara
51
100.00%
1
100.00%
Total
51
100.00%
1
100.00%


static inline

void dquot_free_reserved_space(struct dquot *dquot, qsize_t number)
{
	if (dquot->dq_dqb.dqb_rsvspace >= number)
		dquot->dq_dqb.dqb_rsvspace -= number;
	else {
		WARN_ON_ONCE(1);
		dquot->dq_dqb.dqb_rsvspace = 0;
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jan Kara
26
53.06%
1
25.00%
Mingming Cao
21
42.86%
1
25.00%
Linus Torvalds (pre-git)
2
4.08%
2
50.00%
Total
49
100.00%
4
100.00%



static 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 = (time64_t) 0;
	clear_bit(DQ_INODES_B, &dquot->dq_flags);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
48
55.17%
2
25.00%
Jan Kara
32
36.78%
4
50.00%
Andrew Morton
6
6.90%
1
12.50%
Arnd Bergmann
1
1.15%
1
12.50%
Total
87
100.00%
8
100.00%



static 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 = (time64_t) 0;
	clear_bit(DQ_BLKS_B, &dquot->dq_flags);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
47
54.02%
2
25.00%
Jan Kara
33
37.93%
4
50.00%
Andrew Morton
6
6.90%
1
12.50%
Arnd Bergmann
1
1.15%
1
12.50%
Total
87
100.00%
8
100.00%


struct dquot_warn {
	
struct super_block *w_sb;
	
struct kqid w_dq_id;
	
short w_type;
};



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);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jan Kara
65
100.00%
1
100.00%
Total
65
100.00%
1
100.00%

#ifdef CONFIG_PRINT_QUOTA_WARNING

static int flag_print_warnings = 1;



static int need_print_warning(struct dquot_warn *warn)
{
	if (!flag_print_warnings)
		return 0;

	switch (warn->w_dq_id.type) {
		case USRQUOTA:
			return uid_eq(current_fsuid(), warn->w_dq_id.uid);
		case GRPQUOTA:
			return in_group_p(warn->w_dq_id.gid);
		case PRJQUOTA:
			return 1;
	}
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
33
49.25%
3
30.00%
Jan Kara
20
29.85%
3
30.00%
Eric W. Biedermann
11
16.42%
2
20.00%
David Howells
2
2.99%
1
10.00%
Li Xi
1
1.49%
1
10.00%
Total
67
100.00%
10
100.00%

/* Print warning to user which exceeded quota */


static void print_warning(struct dquot_warn *warn)
{
	char *msg = NULL;
	struct tty_struct *tty;
	int warntype = warn->w_type;

	if (warntype == QUOTA_NL_IHARDBELOW ||
	    warntype == QUOTA_NL_ISOFTBELOW ||
	    warntype == QUOTA_NL_BHARDBELOW ||
	    warntype == QUOTA_NL_BSOFTBELOW || !need_print_warning(warn))
		return;

	tty = get_current_tty();
	if (!tty)
		return;
	tty_write_message(tty, warn->w_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[warn->w_dq_id.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);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds
81
44.75%
2
13.33%
Jan Kara
51
28.18%
5
33.33%
Linus Torvalds (pre-git)
30
16.57%
3
20.00%
Peter Zijlstra
10
5.52%
1
6.67%
Eric W. Biedermann
3
1.66%
1
6.67%
Alan Cox
3
1.66%
1
6.67%
Andrew Morton
2
1.10%
1
6.67%
Al Viro
1
0.55%
1
6.67%
Total
181
100.00%
15
100.00%

#endif



static void prepare_warning(struct dquot_warn *warn, struct dquot *dquot,
			    int warntype)
{
	if (warning_issued(dquot, warntype))
		return;
	warn->w_type = warntype;
	warn->w_sb = dquot->dq_sb;
	warn->w_dq_id = dquot->dq_id;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jan Kara
41
80.39%
1
50.00%
Linus Torvalds
10
19.61%
1
50.00%
Total
51
100.00%
2
100.00%

/*
 * Write warnings to the console and send warning messages over netlink.
 *
 * Note that this function can call into tty and networking code.
 */


static void flush_warnings(struct dquot_warn *warn)
{
	int i;

	for (i = 0; i < MAXQUOTAS; i++) {
		if (warn[i].w_type == QUOTA_NL_NOWARN)
			continue;
#ifdef CONFIG_PRINT_QUOTA_WARNING
		print_warning(&warn[i]);
#endif
		quota_send_warning(warn[i].w_dq_id,
				   warn[i].w_sb->s_dev, warn[i].w_type);
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jan Kara
45
55.56%
2
40.00%
Linus Torvalds
26
32.10%
1
20.00%
Steven Whitehouse
9
11.11%
1
20.00%
Linus Torvalds (pre-git)
1
1.23%
1
20.00%
Total
81
100.00%
5
100.00%



static int ignore_hardlimit(struct dquot *dquot)
{
	struct mem_dqinfo *info = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_id.type];

	return capable(CAP_SYS_RESOURCE) &&
	       (info->dqi_format->qf_fmt_id != QFMT_VFS_OLD ||
		!(info->dqi_flags & DQF_ROOT_SQUASH));
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jan Kara
39
67.24%
3
42.86%
Linus Torvalds (pre-git)
16
27.59%
3
42.86%
Eric W. Biedermann
3
5.17%
1
14.29%
Total
58
100.00%
7
100.00%

/* needs dq_data_lock */


static int check_idq(struct dquot *dquot, qsize_t inodes,
		     struct dquot_warn *warn)
{
	qsize_t newinodes = dquot->dq_dqb.dqb_curinodes + inodes;

	if (!sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_id.type) ||
	    test_bit(DQ_FAKE_B, &dquot->dq_flags))
		return 0;

	if (dquot->dq_dqb.dqb_ihardlimit &&
	    newinodes > dquot->dq_dqb.dqb_ihardlimit &&
            !ignore_hardlimit(dquot)) {
		prepare_warning(warn, dquot, QUOTA_NL_IHARDWARN);
		return -EDQUOT;
	}

	if (dquot->dq_dqb.dqb_isoftlimit &&
	    newinodes > dquot->dq_dqb.dqb_isoftlimit &&
	    dquot->dq_dqb.dqb_itime &&
	    ktime_get_real_seconds() >= dquot->dq_dqb.dqb_itime &&
            !ignore_hardlimit(dquot)) {
		prepare_warning(warn, dquot, QUOTA_NL_ISOFTLONGWARN);
		return -EDQUOT;
	}

	if (dquot->dq_dqb.dqb_isoftlimit &&
	    newinodes > dquot->dq_dqb.dqb_isoftlimit &&
	    dquot->dq_dqb.dqb_itime == 0) {
		prepare_warning(warn, dquot, QUOTA_NL_ISOFTWARN);
		dquot->dq_dqb.dqb_itime = ktime_get_real_seconds() +
		    sb_dqopt(dquot->dq_sb)->info[dquot->dq_id.type].dqi_igrace;
	}

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
100
46.95%
4
23.53%
Jan Kara
89
41.78%
7
41.18%
Andrew Morton
6
2.82%
1
5.88%
Eric W. Biedermann
6
2.82%
1
5.88%
Christoph Hellwig
6
2.82%
1
5.88%
Linus Torvalds
2
0.94%
1
5.88%
Arnd Bergmann
2
0.94%
1
5.88%
Andi Kleen
2
0.94%
1
5.88%
Total
213
100.00%
17
100.00%

/* needs dq_data_lock */


static int check_bdq(struct dquot *dquot, qsize_t space, int prealloc,
		     struct dquot_warn *warn)
{
	qsize_t tspace;
	struct super_block *sb = dquot->dq_sb;

	if (!sb_has_quota_limits_enabled(sb, dquot->dq_id.type) ||
	    test_bit(DQ_FAKE_B, &dquot->dq_flags))
		return 0;

	tspace = dquot->dq_dqb.dqb_curspace + dquot->dq_dqb.dqb_rsvspace
		+ space;

	if (dquot->dq_dqb.dqb_bhardlimit &&
	    tspace > dquot->dq_dqb.dqb_bhardlimit &&
            !ignore_hardlimit(dquot)) {
		if (!prealloc)
			prepare_warning(warn, dquot, QUOTA_NL_BHARDWARN);
		return -EDQUOT;
	}

	if (dquot->dq_dqb.dqb_bsoftlimit &&
	    tspace > dquot->dq_dqb.dqb_bsoftlimit &&
	    dquot->dq_dqb.dqb_btime &&
	    ktime_get_real_seconds() >= dquot->dq_dqb.dqb_btime &&
            !ignore_hardlimit(dquot)) {
		if (!prealloc)
			prepare_warning(warn, dquot, QUOTA_NL_BSOFTLONGWARN);
		return -EDQUOT;
	}

	if (dquot->dq_dqb.dqb_bsoftlimit &&
	    tspace > dquot->dq_dqb.dqb_bsoftlimit &&
	    dquot->dq_dqb.dqb_btime == 0) {
		if (!prealloc) {
			prepare_warning(warn, dquot, QUOTA_NL_BSOFTWARN);
			dquot->dq_dqb.dqb_btime = ktime_get_real_seconds() +
			    sb_dqopt(sb)->info[dquot->dq_id.type].dqi_bgrace;
		}
		else
			/*
                         * We don't allow preallocation to exceed softlimit so exceeding will
                         * be always printed
                         */
			return -EDQUOT;
	}

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
109
43.25%
5
26.32%
Jan Kara
97
38.49%
7
36.84%
Mingming Cao
20
7.94%
1
5.26%
Christoph Hellwig
8
3.17%
1
5.26%
Andrew Morton
6
2.38%
1
5.26%
Eric W. Biedermann
6
2.38%
1
5.26%
Arnd Bergmann
2
0.79%
1
5.26%
Linus Torvalds
2
0.79%
1
5.26%
Andi Kleen
2
0.79%
1
5.26%
Total
252
100.00%
19
100.00%



static int info_idq_free(struct dquot *dquot, qsize_t inodes)
{
	qsize_t newinodes;

	if (test_bit(DQ_FAKE_B, &dquot->dq_flags) ||
	    dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit ||
	    !sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_id.type))
		return QUOTA_NL_NOWARN;

	newinodes = dquot->dq_dqb.dqb_curinodes - inodes;
	if (newinodes <= dquot->dq_dqb.dqb_isoftlimit)
		return QUOTA_NL_ISOFTBELOW;
	if (dquot->dq_dqb.dqb_curinodes >= dquot->dq_dqb.dqb_ihardlimit &&
	    newinodes < dquot->dq_dqb.dqb_ihardlimit)
		return QUOTA_NL_IHARDBELOW;
	return QUOTA_NL_NOWARN;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jan Kara
106
97.25%
4
80.00%
Eric W. Biedermann
3
2.75%
1
20.00%
Total
109
100.00%
5
100.00%



static int info_bdq_free(struct dquot *dquot, qsize_t space)
{
	if (test_bit(DQ_FAKE_B, &dquot->dq_flags) ||
	    dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit)
		return QUOTA_NL_NOWARN;

	if (dquot->dq_dqb.dqb_curspace - space <= dquot->dq_dqb.dqb_bsoftlimit)
		return QUOTA_NL_BSOFTBELOW;
	if (dquot->dq_dqb.dqb_curspace >= dquot->dq_dqb.dqb_bhardlimit &&
	    dquot->dq_dqb.dqb_curspace - space < dquot->dq_dqb.dqb_bhardlimit)
		return QUOTA_NL_BHARDBELOW;
	return QUOTA_NL_NOWARN;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jan Kara
94
100.00%
1
100.00%
Total
94
100.00%
1
100.00%



static int dquot_active(const struct inode *inode)
{
	struct super_block *sb = inode->i_sb;

	if (IS_NOQUOTA(inode))
		return 0;
	return sb_any_quota_loaded(sb) & ~sb_any_quota_suspended(sb);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Hellwig
43
100.00%
1
100.00%
Total
43
100.00%
1
100.00%

/*
 * Initialize quota pointers in inode
 *
 * It is better to call this function outside of any transaction as it
 * might need a lot of space in journal for dquot structure allocation.
 */


static int __dquot_initialize(struct inode *inode, int type)
{
	int cnt, init_needed = 0;
	struct dquot **dquots, *got[MAXQUOTAS] = {};
	struct super_block *sb = inode->i_sb;
	qsize_t rsv;
	int ret = 0;

	if (!dquot_active(inode))
		return 0;

	dquots = i_dquot(inode);

	/* First get references to structures we might need. */
	for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
		struct kqid qid;
		kprojid_t projid;
		int rc;
		struct dquot *dquot;

		if (type != -1 && cnt != type)
			continue;
		/*
                 * The i_dquot should have been initialized in most cases,
                 * we check it without locking here to avoid unnecessary
                 * dqget()/dqput() calls.
                 */
		if (dquots[cnt])
			continue;

		if (!sb_has_quota_active(sb, cnt))
			continue;

		init_needed = 1;

		switch (cnt) {
		case USRQUOTA:
			qid = make_kqid_uid(inode->i_uid);
			break;
		case GRPQUOTA:
			qid = make_kqid_gid(inode->i_gid);
			break;
		case PRJQUOTA:
			rc = inode->i_sb->dq_op->get_projid(inode, &projid);
			if (rc)
				continue;
			qid = make_kqid_projid(projid);
			break;
		}
		dquot = dqget(sb, qid);
		if (IS_ERR(dquot)) {
			/* We raced with somebody turning quotas off... */
			if (PTR_ERR(dquot) != -ESRCH) {
				ret = PTR_ERR(dquot);
				goto out_put;
			}
			dquot = NULL;
		}
		got[cnt] = dquot;
	}

	/* All required i_dquot has been initialized */
	if (!init_needed)
		return 0;

	spin_lock(&dq_data_lock);
	if (IS_NOQUOTA(inode))
		goto out_lock;
	for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
		if (type != -1 && cnt != type)
			continue;
		/* Avoid races with quotaoff() */
		if (!sb_has_quota_active(sb, cnt))
			continue;
		/* We could race with quotaon or dqget() could have failed */
		if (!got[cnt])
			continue;
		if (!dquots[cnt]) {
			dquots[cnt] = got[cnt];
			got[cnt] = NULL;
			/*
                         * Make quota reservation system happy if someone
                         * did a write before quota was turned on
                         */
			rsv = inode_get_rsv_space(inode);
			if (unlikely(rsv))
				dquot_resv_space(dquots[cnt], rsv);
		}
	}
out_lock:
	spin_unlock(&dq_data_lock);
out_put:
	/* Drop unused references */
	dqput_all(got);

	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jan Kara
176
44.22%
6
28.57%
Linus Torvalds (pre-git)
95
23.87%
3
14.29%
Li Xi
49
12.31%
1
4.76%
Niu YaWei
26
6.53%
2
9.52%
Konstantin Khlebnikov
15
3.77%
1
4.76%
Andrew Morton
14
3.52%
2
9.52%
Eric W. Biedermann
13
3.27%
1
4.76%
Christoph Hellwig
5
1.26%
2
9.52%
Linus Torvalds
2
0.50%
1
4.76%
Nikolay Borisov
2
0.50%
1
4.76%
Dmitriy Monakhov
1
0.25%
1
4.76%
Total
398
100.00%
21
100.00%



int dquot_initialize(struct inode *inode)
{
	return __dquot_initialize(inode, -1);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Hellwig
15
78.95%
1
33.33%
Jan Kara
4
21.05%
2
66.67%
Total
19
100.00%
3
100.00%


EXPORT_SYMBOL(dquot_initialize);

/*
 * Release all quotas referenced by inode.
 *
 * This function only be called on inode free or converting
 * a file to quota file, no other users for the i_dquot in
 * both cases, so we needn't call synchronize_srcu() after
 * clearing i_dquot.
 */


static void __dquot_drop(struct inode *inode)
{
	int cnt;
	struct dquot **dquots = i_dquot(inode);
	struct dquot *put[MAXQUOTAS];

	spin_lock(&dq_data_lock);
	for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
		put[cnt] = dquots[cnt];
		dquots[cnt] = NULL;
	}
	spin_unlock(&dq_data_lock);
	dqput_all(put);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jan Kara
56
68.29%
3
37.50%
Konstantin Khlebnikov
13
15.85%
1
12.50%
Andrew Morton
5
6.10%
1
12.50%
Niu YaWei
4
4.88%
1
12.50%
Christoph Hellwig
3
3.66%
1
12.50%
Dmitriy Monakhov
1
1.22%
1
12.50%
Total
82
100.00%
8
100.00%



void dquot_drop(struct inode *inode)
{
	struct dquot * const *dquots;
	int cnt;

	if (IS_NOQUOTA(inode))
		return;

	/*
         * Test before calling to rule out calls from proc and such
         * where we are not allowed to block. Note that this is
         * actually reliable test even without the lock - the caller
         * must assure that nobody can come after the DQUOT_DROP and
         * add quota pointers back anyway.
         */
	dquots = i_dquot(inode);
	for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
		if (dquots[cnt])
			break;
	}

	if (cnt < MAXQUOTAS)
		__dquot_drop(inode);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Jan Kara
46
65.71%
1
33.33%
Konstantin Khlebnikov
15
21.43%
1
33.33%
Christoph Hellwig
9
12.86%
1
33.33%
Total
70
100.00%
3
100.00%


EXPORT_SYMBOL(dquot_drop);

/*
 * inode_reserved_space is managed internally by quota, and protected by
 * i_lock similar to i_blocks+i_bytes.
 */


static qsize_t *inode_reserved_space(struct inode * inode)
{
	/* Filesystem must explicitly define it's own method in order to use
         * quota reservation interface */
	BUG_ON(!inode->i_sb->dq_op->get_reserved_space);
	return inode->i_sb->dq_op->get_reserved_space(inode);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Dmitriy Monakhov
37
100.00%
1
100.00%
Total
37
100.00%
1
100.00%



void inode_add_rsv_space(struct inode *inode, qsize_t number)
{
	spin_lock(&inode->i_lock);
	*inode_reserved_space(inode) += number;
	spin_unlock(&inode->i_lock);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Dmitriy Monakhov
37
100.00%
1
100.00%
Total
37
100.00%
1
100.00%


EXPORT_SYMBOL(inode_add_rsv_space);



void inode_claim_rsv_space(struct inode *inode, qsize_t number)
{
	spin_lock(&inode->i_lock);
	*inode_reserved_space(inode) -= number;
	__inode_add_bytes(inode, number);
	spin_unlock(&inode->i_lock);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Dmitriy Monakhov
44
100.00%
1
100.00%
Total
44
100.00%
1
100.00%


EXPORT_SYMBOL(inode_claim_rsv_space);



void inode_reclaim_rsv_space(struct inode *inode, qsize_t number)
{
	spin_lock(&inode->i_lock);
	*inode_reserved_space(inode) += number;
	__inode_sub_bytes(inode, number);
	spin_unlock(&inode->i_lock);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Jan Kara
44
100.00%
1
100.00%
Total
44
100.00%
1
100.00%


EXPORT_SYMBOL(inode_reclaim_rsv_space);



void inode_sub_rsv_space(struct inode *inode, qsize_t number)
{
	spin_lock(&inode->i_lock);
	*inode_reserved_space(inode) -= number;
	spin_unlock(&inode->i_lock);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Dmitriy Monakhov
37
100.00%
1
100.00%
Total
37
100.00%
1
100.00%


EXPORT_SYMBOL(inode_sub_rsv_space);



static qsize_t inode_get_rsv_space(struct inode *inode)
{
	qsize_t ret;

	if (!inode->i_sb->dq_op->get_reserved_space)
		return 0;
	spin_lock(&inode->i_lock);
	ret = *inode_reserved_space(inode);
	spin_unlock(&inode->i_lock);
	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Dmitriy Monakhov
41
74.55%
1
50.00%
Jan Kara
14
25.45%
1
50.00%
Total
55
100.00%
2
100.00%



static void inode_incr_space(struct inode *inode, qsize_t number,
				int reserve)
{
	if (reserve)
		inode_add_rsv_space(inode, number);
	else
		inode_add_bytes(inode, number);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Dmitriy Monakhov
36
100.00%
1
100.00%
Total
36
100.00%
1
100.00%



static void inode_decr_space(struct inode *inode, qsize_t number, int reserve)
{
	if (reserve)
		inode_sub_rsv_space(inode, number);
	else
		inode_sub_bytes(inode, number);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Dmitriy Monakhov
36
100.00%
1
100.00%
Total
36
100.00%
1
100.00%

/*
 * This functions updates i_blocks+i_bytes fields and quota information
 * (together with appropriate checks).
 *
 * NOTE: We absolutely rely on the fact that caller dirties the inode
 * (usually helpers in quotaops.h care about this) and holds a handle for
 * the current transaction so that dquot write and inode write go into the
 * same transaction.
 */

/*
 * This operation can block, but only after everything is updated
 */


int __dquot_alloc_space(struct inode *inode, qsize_t number, int flags)
{
	int cnt, ret = 0, index;
	struct dquot_warn warn[MAXQUOTAS];
	int reserve = flags & DQUOT_SPACE_RESERVE;
	struct dquot **dquots;

	if (!dquot_active(inode)) {
		inode_incr_space(inode, number, reserve);
		goto out;
	}

	for (cnt = 0; cnt < MAXQUOTAS; cnt++)
		warn[cnt].w_type = QUOTA_NL_NOWARN;

	dquots = i_dquot(inode);
	index = srcu_read_lock(&dquot_srcu);
	spin_lock(&dq_data_lock);
	for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
		if (!dquots[cnt])
			continue;
		ret = check_bdq(dquots[cnt], number,
				!(flags & DQUOT_SPACE_WARN), &warn[cnt]);
		if (ret && !(flags & DQUOT_SPACE_NOFAIL)) {
			spin_unlock(&dq_data_lock);
			goto out_flush_warn;
		}
	}
	for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
		if (!dquots[cnt])
			continue;
		if (reserve)
			dquot_resv_space(dquots[cnt], number);
		else
			dquot_incr_space(dquots[cnt], number);
	}
	inode_incr_space(inode, number, reserve);
	spin_unlock(&dq_data_lock);

	if (reserve)
		goto out_flush_warn;
	mark_all_dquot_dirty(dquots);
out_flush_warn:
	srcu_read_unlock(&dquot_srcu, index);
	flush_warnings(warn);
out:
	return ret;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Andrew Morton
84
30.32%
4
16.67%
Linus Torvalds (pre-git)
41
14.80%
3
12.50%
Jan Kara
36
13.00%
5
20.83%
Dmitriy Monakhov
35
12.64%
2
8.33%
Mingming Cao
31
11.19%
1
4.17%
Konstantin Khlebnikov
13
4.69%
1
4.17%
Eric Sandeen
10
3.61%
2
8.33%
Niu YaWei
10
3.61%
1
4.17%
Christoph Hellwig
10
3.61%
3
12.50%
Jie Liu
4
1.44%
1
4.17%
Linus Torvalds
3
1.08%
1
4.17%
Total
277
100.00%
24
100.00%


EXPORT_SYMBOL(__dquot_alloc_space);

/*
 * This operation can block, but only after everything is updated
 */


int dquot_alloc_inode(struct inode *inode)
{
	int cnt, ret = 0, index;
	struct dquot_warn warn[MAXQUOTAS];
	struct dquot * const *dquots;

	if (!dquot_active(inode))
		return 0;
	for (cnt = 0; cnt < MAXQUOTAS; cnt++)
		warn[cnt].w_type = QUOTA_NL_NOWARN;

	dquots = i_dquot(inode);
	index = srcu_read_lock(&dquot_srcu);
	spin_lock(&dq_data_lock);
	for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
		if (!dquots[cnt])
			continue;
		ret = check_idq(dquots[cnt], 1, &warn[cnt]);
		if (ret)
			goto warn_put_all;
	}

	for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
		if (!dquots[cnt])
			continue;
		dquot_incr_inodes(dquots[cnt], 1);
	}

warn_put_all:
	spin_unlock(&dq_data_lock);
	if (ret == 0)
		mark_all_dquot_dirty(dquots);
	srcu_read_unlock(&dquot_srcu, index);
	flush_warnings(warn);
	return ret;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
74
36.10%
2
11.76%
Andrew Morton
33
16.10%
3
17.65%
Jan Kara
30
14.63%
3
17.65%
Linus Torvalds
29
14.15%
1
5.88%
Christoph Hellwig
13
6.34%
3
17.65%
Niu YaWei
10
4.88%
1
5.88%
Mingming Cao
7
3.41%
1
5.88%
Konstantin Khlebnikov
7
3.41%
1
5.88%
Al Viro
1
0.49%
1
5.88%
Dmitriy Monakhov
1
0.49%
1
5.88%
Total
205
100.00%
17
100.00%


EXPORT_SYMBOL(dquot_alloc_inode);

/*
 * Convert in-memory reserved quotas to real consumed quotas
 */


int dquot_claim_space_nodirty(struct inode *inode, qsize_t number)
{
	struct dquot **dquots;
	int cnt, index;

	if (!dquot_active(inode)) {
		inode_claim_rsv_space(inode, number);
		return 0;
	}

	dquots = i_dquot(inode);
	index = srcu_read_lock(&dquot_srcu);
	spin_lock(&dq_data_lock);
	/* Claim reserved quotas to allocated quotas */
	for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
		if (dquots[cnt])
			dquot_claim_reserved_space(dquots[cnt], number);
	}
	/* Update inode bytes */
	inode_claim_rsv_space(inode, number);
	spin_unlock(&dq_data_lock);
	mark_all_dquot_dirty(dquots);
	srcu_read_unlock(&dquot_srcu, index);
	return 0;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Andrew Morton
33
25.78%
2
14.29%
Mingming Cao
27
21.09%
1
7.14%
Dmitriy Monakhov
26
20.31%
2
14.29%
Konstantin Khlebnikov
16
12.50%
1
7.14%
Niu YaWei
10
7.81%
1
7.14%
Christoph Hellwig
7
5.47%
2
14.29%
Jan Kara
4
3.12%
2
14.29%
Linus Torvalds
3
2.34%
1
7.14%
Linus Torvalds (pre-git)
1
0.78%
1
7.14%
Al Viro
1
0.78%
1
7.14%
Total
128
100.00%
14
100.00%


EXPORT_SYMBOL(dquot_claim_space_nodirty);

/*
 * Convert allocated space back to in-memory reserved quotas
 */


void dquot_reclaim_space_nodirty(struct inode *inode, qsize_t number)
{
	struct dquot **dquots;
	int cnt, index;

	if (!dquot_active(inode)) {
		inode_reclaim_rsv_space(inode, number);
		return;
	}

	dquots = i_dquot(inode);
	index = srcu_read_lock(&dquot_srcu);
	spin_lock(&dq_data_lock);
	/* Claim reserved quotas to allocated quotas */
	for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
		if (dquots[cnt])
			dquot_reclaim_reserved_space(dquots[cnt], number);
	}
	/* Update inode bytes */
	inode_reclaim_rsv_space(inode, number);
	spin_unlock(&dq_data_lock);
	mark_all_dquot_dirty(dquots);
	srcu_read_unlock(&dquot_srcu, index);
	return;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Jan Kara
98
79.03%
1
33.33%
Konstantin Khlebnikov
16
12.90%
1
33.33%
Niu YaWei
10
8.06%
1
33.33%
Total
124
100.00%
3
100.00%


EXPORT_SYMBOL(dquot_reclaim_space_nodirty);

/*
 * This operation can block, but only after everything is updated
 */


void __dquot_free_space(struct inode *inode, qsize_t number, int flags)
{
	unsigned int cnt;
	struct dquot_warn warn[MAXQUOTAS];
	struct dquot **dquots;
	int reserve = flags & DQUOT_SPACE_RESERVE, index;

	if (!dquot_active(inode)) {
		inode_decr_space(inode, number, reserve);
		return;
	}

	dquots = i_dquot(inode);
	index = srcu_read_lock(&dquot_srcu);
	spin_lock(&dq_data_lock);
	for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
		int wtype;

		warn[cnt].w_type = QUOTA_NL_NOWARN;
		if (!dquots[cnt])
			continue;
		wtype = info_bdq_free(dquots[cnt], number);
		if (wtype != QUOTA_NL_NOWARN)
			prepare_warning(&warn[cnt], dquots[cnt], wtype);
		if (reserve)
			dquot_free_reserved_space(dquots[cnt], number);
		else
			dquot_decr_space(dquots[cnt], number);
	}
	inode_decr_space(inode, number, reserve);
	spin_unlock(&dq_data_lock);

	if (reserve)
		goto out_unlock;
	mark_all_dquot_dirty(dquots);
out_unlock:
	srcu_read_unlock(&dquot_srcu, index);
	flush_warnings(warn);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Jan Kara
75
34.09%
7
33.33%
Andrew Morton
38
17.27%
3
14.29%
Linus Torvalds (pre-git)
37
16.82%
2
9.52%
Dmitriy Monakhov
34
15.45%
2
9.52%
Niu YaWei
10
4.55%
1
4.76%
Eric Sandeen
8
3.64%
1
4.76%
Konstantin Khlebnikov
7
3.18%
1
4.76%
Linus Torvalds
5
2.27%
1
4.76%
Christoph Hellwig
4
1.82%
2
9.52%
Al Viro
2
0.91%
1
4.76%
Total
220
100.00%
21
100.00%


EXPORT_SYMBOL(__dquot_free_space);

/*
 * This operation can block, but only after everything is updated
 */


void dquot_free_inode(struct inode *inode)
{
	unsigned int cnt;
	struct dquot_warn warn[MAXQUOTAS];
	struct dquot * const *dquots;
	int index;

	if (!dquot_active(inode))
		return;

	dquots = i_dquot(inode);
	index = srcu_read_lock(&dquot_srcu);
	spin_lock(&dq_data_lock);
	for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
		int wtype;

		warn[cnt].w_type = QUOTA_NL_NOWARN;
		if (!dquots[cnt])
			continue;
		wtype = info_idq_free(dquots[cnt], 1);
		if (wtype != QUOTA_NL_NOWARN)
			prepare_warning(&warn[cnt], dquots[cnt], wtype);
		dquot_decr_inodes(dquots[cnt], 1);
	}
	spin_unlock(&dq_data_lock);
	mark_all_dquot_dirty(dquots);
	srcu_read_unlock(&dquot_srcu, index);
	flush_warnings(warn);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Jan Kara
64
38.79%
5
29.41%
Linus Torvalds (pre-git)
41
24.85%
3
17.65%
Andrew Morton
18
10.91%
3
17.65%
Linus Torvalds
17
10.30%
1
5.88%
Niu YaWei
11
6.67%
1
5.88%
Konstantin Khlebnikov
7
4.24%
1
5.88%
Christoph Hellwig
6
3.64%
2
11.76%
Dmitriy Monakhov
1
0.61%
1
5.88%
Total
165
100.00%
17
100.00%


EXPORT_SYMBOL(dquot_free_inode);

/*
 * Transfer the number of inode and blocks from one diskquota to an other.
 * On success, dquot references in transfer_to are consumed and references
 * to original dquots that need to be released are placed there. On failure,
 * references are kept untouched.
 *
 * This operation can block, but only after everything is updated
 * A transaction must be started when entering this function.
 *
 * We are holding reference on transfer_from & transfer_to, no need to
 * protect them by srcu_read_lock().
 */


int __dquot_transfer(struct inode *inode, struct dquot **transfer_to)
{
	qsize_t space, cur_space;
	qsize_t rsv_space = 0;
	struct dquot *transfer_from[MAXQUOTAS] = {};
	int cnt, ret = 0;
	char is_valid[MAXQUOTAS] = {};
	struct dquot_warn warn_to[MAXQUOTAS];
	struct dquot_warn warn_from_inodes[MAXQUOTAS];
	struct dquot_warn warn_from_space[MAXQUOTAS];

	if (IS_NOQUOTA(inode))
		return 0;
	/* Initialize the arrays */
	for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
		warn_to[cnt].w_type = QUOTA_NL_NOWARN;
		warn_from_inodes[cnt].w_type = QUOTA_NL_NOWARN;
		warn_from_space[cnt].w_type = QUOTA_NL_NOWARN;
	}

	spin_lock(&dq_data_lock);
	if (IS_NOQUOTA(inode)) {	/* File without quota accounting? */
		spin_unlock(&dq_data_lock);
		return 0;
	}
	cur_space = inode_get_bytes(inode);
	rsv_space = inode_get_rsv_space(inode);
	space = cur_space + rsv_space;
	/* Build the transfer_from list and check the limits */
	for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
		/*
                 * Skip changes for same uid or gid or for turned off quota-type.
                 */
		if (!transfer_to[cnt])
			continue;
		/* Avoid races with quotaoff() */
		if (!sb_has_quota_active(inode->i_sb, cnt))
			continue;
		is_valid[cnt] = 1;
		transfer_from[cnt] = i_dquot(inode)[cnt];
		ret = check_idq(transfer_to[cnt], 1, &warn_to[cnt]);
		if (ret)
			goto over_quota;
		ret = check_bdq(transfer_to[cnt], space, 0, &warn_to[cnt]);
		if (ret)
			goto over_quota;
	}

	/*
         * Finally perform the needed transfer from transfer_from to transfer_to
         */
	for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
		if (!is_valid[cnt])
			continue;
		/* Due to IO error we might not have transfer_from[] structure */
		if (transfer_from[cnt]) {
			int wtype;
			wtype = info_idq_free(transfer_from[cnt], 1);
			if (wtype != QUOTA_NL_NOWARN)
				prepare_warning(&warn_from_inodes[cnt],
						transfer_from[cnt], wtype);
			wtype = info_bdq_free(transfer_from[cnt], space);
			if (wtype != QUOTA_NL_NOWARN)
				prepare_warning(&warn_from_space[cnt],
						transfer_from[cnt], wtype);
			dquot_decr_inodes(transfer_from[cnt], 1);
			dquot_decr_space(transfer_from[cnt], cur_space);
			dquot_free_reserved_space(transfer_from[cnt],
						  rsv_space);
		}

		dquot_incr_inodes(transfer_to[cnt], 1);
		dquot_incr_space(transfer_to[cnt], cur_space);
		dquot_resv_space(transfer_to[cnt], rsv_space);

		i_dquot(inode)[cnt] = transfer_to[cnt];
	}
	spin_unlock(&dq_data_lock);

	mark_all_dquot_dirty(transfer_from);
	mark_all_dquot_dirty(transfer_to);
	flush_warnings(warn_to);
	flush_warnings(warn_from_inodes);
	flush_warnings(warn_from_space);
	/* Pass back references to put */
	for (cnt = 0; cnt < MAXQUOTAS; cnt++)
		if (is_valid[cnt])
			transfer_to[cnt] = transfer_from[cnt];
	return 0;
over_quota:
	spin_unlock(&dq_data_lock);
	flush_warnings(warn_to);
	return ret;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Jan Kara
235
43.36%
11
37.93%
Linus Torvalds (pre-git)
100
18.45%
5
17.24%
Andrew Morton
66
12.18%
5
17.24%
Dmitriy Monakhov
48
8.86%
3
10.34%
Mingming Cao
42
7.75%
1
3.45%
Linus Torvalds
28
5.17%
1
3.45%
Christoph Hellwig
19
3.51%
2
6.90%
Niu YaWei
4
0.74%
1
3.45%
Total
542
100.00%
29
100.00%


EXPORT_SYMBOL(__dquot_transfer);

/* Wrapper for transferring ownership of an inode for uid/gid only
 * Called from FSXXX_setattr()
 */


int dquot_transfer(struct inode *inode, struct iattr *iattr)
{
	struct dquot *transfer_to[MAXQUOTAS] = {};
	struct dquot *dquot;
	struct super_block *sb = inode->i_sb;
	int ret;

	if (!dquot_active(inode))
		return 0;

	if (iattr->ia_valid & ATTR_UID && !uid_eq(iattr->ia_uid, inode->i_uid)){
		dquot = dqget(sb, make_kqid_uid(iattr->ia_uid));
		if (IS_ERR(dquot)) {
			if (PTR_ERR(dquot) != -ESRCH) {
				ret = PTR_ERR(dquot);
				goto out_put;
			}
			dquot = NULL;
		}
		transfer_to[USRQUOTA] = dquot;
	}
	if (iattr->ia_valid & ATTR_GID && !gid_eq(iattr->ia_gid, inode->i_gid)){
		dquot = dqget(sb, make_kqid_gid(iattr->ia_gid));
		if (IS_ERR(dquot)) {
			if (PTR_ERR(dquot) != -ESRCH) {
				ret = PTR_ERR(dquot);
				goto out_put;
			}
			dquot = NULL;
		}
		transfer_to[GRPQUOTA] = dquot;
	}
	ret = __dquot_transfer(inode, transfer_to);
out_put:
	dqput_all(transfer_to);
	return ret;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Jan Kara
167
73.25%
4
44.44%
Dmitriy Monakhov
42
18.42%
1
11.11%
Eric W. Biedermann
16
7.02%
2
22.22%
Christoph Hellwig
3
1.32%
2
22.22%
Total
228
100.00%
9
100.00%


EXPORT_SYMBOL(dquot_transfer);

/*
 * Write info of quota file to disk
 */


int dquot_commit_info(struct super_block *sb, int type)
{
	int ret;
	struct quota_info *dqopt = sb_dqopt(sb);

	mutex_lock(&dqopt->dqio_mutex);
	ret = dqopt->ops[type]->write_file_info(sb, type);
	mutex_unlock(&dqopt->dqio_mutex);
	return ret;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Andrew Morton
53
86.89%
2
40.00%
Ingo Molnar
4
6.56%
1
20.00%
Linus Torvalds (pre-git)
3
4.92%
1
20.00%
Linus Torvalds
1
1.64%
1
20.00%
Total
61
100.00%
5
100.00%


EXPORT_SYMBOL(dquot_commit_info);



int dquot_get_next_id(struct super_block *sb, struct kqid *qid)
{
	struct quota_info *dqopt = sb_dqopt(sb);
	int err;

	if (!sb_has_quota_active(sb, qid->type))
		return -ESRCH;
	if (!dqopt->ops[qid->type]->get_next_id)
		return -ENOSYS;
	mutex_lock(&dqopt->dqio_mutex);
	err = dqopt->ops[qid->type]->get_next_id(sb, qid);
	mutex_unlock(&dqopt->dqio_mutex);
	return err;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Jan Kara
99
100.00%
3
100.00%
Total
99
100.00%
3
100.00%


EXPORT_SYMBOL(dquot_get_next_id);

/*
 * Definitions of diskquota operations.
 */

const struct dquot_operations dquot_operations = {
	.write_dquot	= dquot_commit,
	.acquire_dquot	= dquot_acquire,
	.release_dquot	= dquot_release,
	.mark_dirty	= dquot_mark_dquot_dirty,
	.write_info	= dquot_commit_info,
	.alloc_dquot	= dquot_alloc,
	.destroy_dquot	= dquot_destroy,
	.get_next_id	= dquot_get_next_id,
};

EXPORT_SYMBOL(dquot_operations);

/*
 * Generic helper for ->open on filesystems supporting disk quotas.
 */


int dquot_file_open(struct inode *inode, struct file *file)
{
	int error;

	error = generic_file_open(inode, file);
	if (!error && (file->f_mode & FMODE_WRITE))
		dquot_initialize(inode);
	return error;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Hellwig
48
100.00%
2
100.00%
Total
48
100.00%
2
100.00%


EXPORT_SYMBOL(dquot_file_open);

/*
 * Turn quota off on a device. type == -1 ==> quotaoff for all types (umount)
 */


int dquot_disable(struct super_block *sb, int type, unsigned int flags)
{
	int cnt, ret = 0;
	struct quota_info *dqopt = sb_dqopt(sb);
	struct inode *toputinode[MAXQUOTAS];

	/* s_umount should be held in exclusive mode */
	if (WARN_ON_ONCE(down_read_trylock(&sb->s_umount)))
		up_read(&sb->s_umount);

	/* Cannot turn off usage accounting without turning off limits, or
         * suspend quotas and simultaneously turn quotas off. */
	if ((flags & DQUOT_USAGE_ENABLED && !(flags & DQUOT_LIMITS_ENABLED))
	    || (flags & DQUOT_SUSPENDED && flags & (DQUOT_LIMITS_ENABLED |
	    DQUOT_USAGE_ENABLED)))
		return -EINVAL;

	/*
         * Skip everything if there's nothing to do. We have to do this because
         * sometimes we are called when fill_super() failed and calling
         * sync_fs() in such cases does no good.
         */
	if (!sb_any_quota_loaded(sb))
		return 0;

	for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
		toputinode[cnt] = NULL;
		if (type != -1 && cnt != type)
			continue;
		if (!sb_has_quota_loaded(sb, cnt))
			continue;

		if (flags & DQUOT_SUSPENDED) {
			spin_lock(&dq_state_lock);
			dqopt->flags |=
				dquot_state_flag(DQUOT_SUSPENDED, cnt);
			spin_unlock(&dq_state_lock);
		} else {
			spin_lock(&dq_state_lock);
			dqopt->flags &= ~dquot_state_flag(flags, cnt);
			/* Turning off suspended quotas? */
			if (!sb_has_quota_loaded(sb, cnt) &&
			    sb_has_quota_suspended(sb, cnt)) {
				dqopt->flags &=	~dquot_state_flag(
							DQUOT_SUSPENDED, cnt);
				spin_unlock(&dq_state_lock);
				iput(dqopt->files[cnt]);
				dqopt->files[cnt] = NULL;
				continue;
			}
			spin_unlock(&dq_state_lock);
		}

		/* We still have to keep quota loaded? */
		if (sb_has_quota_loaded(sb, cnt) && !(flags & DQUOT_SUSPENDED))
			continue;

		/* Note: these are blocking operations */
		drop_dquot_ref(sb, cnt);
		invalidate_dquots(sb, cnt);
		/*
                 * Now all dquots should be invalidated, all writes done so we
                 * should be only users of the info. No locks needed.
                 */
		if (info_dirty(&dqopt->info[cnt]))
			sb->dq_op->write_info(sb, cnt);
		if (dqopt->ops[cnt]->free_file_info)
			dqopt->ops[cnt]->free_file_info(sb, cnt);
		put_quota_format(dqopt->info[cnt].dqi_format);

		toputinode[cnt] = dqopt->files[cnt];
		if (!sb_has_quota_loaded(sb, cnt))
			dqopt->files[cnt] = NULL;
		dqopt->info[cnt].dqi_flags = 0;
		dqopt->info[cnt].dqi_igrace = 0;
		dqopt->info[cnt].dqi_bgrace = 0;
		dqopt->ops[cnt] = NULL;
	}

	/* Skip syncing and setting flags if quota files are hidden */
	if (dqopt->flags & DQUOT_QUOTA_SYS_FILE)
		goto put_inodes;

	/* Sync the superblock so that buffers with quota data are written to
         * disk (and so userspace sees correct data afterwards). */
	if (sb->s_op->sync_fs)
		sb->s_op->sync_fs(sb, 1);
	sync_blockdev(sb->s_bdev);
	/* Now the quota files are just ordinary files and we can set the
         * inode flags back. Moreover we discard the pagecache so that
         * userspace sees the writes we did bypassing the pagecache. We
         * must also discard the blockdev buffers so that we see the
         * changes done by userspace on the next quotaon() */
	for (cnt = 0; cnt < MAXQUOTAS; cnt++)
		/* This can happen when suspending quotas on remount-ro... */
		if (toputinode[cnt] && !sb_has_quota_loaded(sb, cnt)) {
			inode_lock(toputinode[cnt]);
			toputinode[cnt]->i_flags &= ~(S_IMMUTABLE |
				  S_NOATIME | S_NOQUOTA);
			truncate_inode_pages(&toputinode[cnt]->i_data, 0);
			inode_unlock(toputinode[cnt]);
			mark_inode_dirty_sync(toputinode[cnt]);
		}
	if (sb->s_bdev)
		invalidate_bdev(sb->s_bdev);
put_inodes:
	for (cnt = 0; cnt < MAXQUOTAS; cnt++)
		if (toputinode[cnt]) {
			/* On remount RO, we keep the inode pointer so that we
                         * can reenable quota on the subsequent remount RW. We
                         * have to check 'flags' variable and not use sb_has_
                         * function because another quotaon / quotaoff could
                         * change global state before we got here. We refuse
                         * to suspend quotas when there is pending delete on
                         * the quota file... */
			if (!(flags & DQUOT_SUSPENDED))
				iput(toputinode[cnt]);
			else if (!toputinode[cnt]->i_nlink)
				ret = -EBUSY;
		}
	return ret;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Jan Kara
527
82.73%
15
60.00%
Linus Torvalds (pre-git)
102
16.01%
5
20.00%
Andrew Morton
4
0.63%
2
8.00%
Al Viro
3
0.47%
2
8.00%
Christoph Hellwig
1
0.16%
1
4.00%
Total
637
100.00%
25
100.00%


EXPORT_SYMBOL(dquot_disable);



int dquot_quota_off(struct super_block *sb, int type)
{
	return dquot_disable(sb, type,
			     DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Jan Kara
23
92.00%
1
33.33%
Christoph Hellwig
2
8.00%
2
66.67%
Total
25
100.00%
3
100.00%


EXPORT_SYMBOL(dquot_quota_off);

/*
 *      Turn quotas on on a device
 */

/*
 * Helper function to turn quotas on when we already have the inode of
 * quota file and no quota information is loaded.
 */


static int vfs_load_quota_inode(struct inode *inode, int type, int format_id,
	unsigned int flags)
{
	struct quota_format_type *fmt = find_quota_format(format_id);
	struct super_block *sb = inode->i_sb;
	struct quota_info *dqopt = sb_dqopt(sb);
	int error;
	int oldflags = -1;

	if (!fmt)
		return -ESRCH;
	if (!S_ISREG(inode->i_mode)) {
		error = -EACCES;
		goto out_fmt;
	}
	if (IS_RDONLY(inode)) {
		error = -EROFS;
		goto out_fmt;
	}
	if (!sb->s_op->quota_write || !sb->s_op->quota_read ||
	    (type == PRJQUOTA && sb->dq_op->get_projid == NULL)) {
		error = -EINVAL;
		goto out_fmt;
	}
	/* Filesystems outside of init_user_ns not yet supported */
	if (sb->s_user_ns != &init_user_ns) {
		error = -EINVAL;
		goto out_fmt;
	}
	/* Usage always has to be set... */
	if (!(flags & DQUOT_USAGE_ENABLED)) {
		error = -EINVAL;
		goto out_fmt;
	}
	if (sb_has_quota_loaded(sb, type)) {
		error = -EBUSY;
		goto out_fmt;
	}

	if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) {
		/* As we bypass the pagecache we must now flush all the
                 * dirty data and invalidate caches so that kernel sees
                 * changes from userspace. It is not enough to just flush
                 * the quota file since if blocksize < pagesize, invalidation
                 * of the cache could fail because of other unrelated dirty
                 * data */
		sync_filesystem(sb);
		invalidate_bdev(sb->s_bdev);
	}

	if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) {
		/* 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. */
		inode_lock(inode);
		oldflags = inode->i_flags & (S_NOATIME | S_IMMUTABLE |
					     S_NOQUOTA);
		inode->i_flags |= S_NOQUOTA | S_NOATIME | S_IMMUTABLE;
		inode_unlock(inode);
		/*
                 * When S_NOQUOTA is set, remove dquot references as no more
                 * references can be added
                 */
		__dquot_drop(inode);
	}

	error = -EIO;
	dqopt->files[type] = igrab(inode);
	if (!dqopt->files[type])
		goto out_file_flags;
	error = -EINVAL;
	if (!fmt->qf_ops->check_quota_file(sb, type))
		goto out_file_init;

	dqopt->ops[type] = fmt->qf_ops;
	dqopt->info[type].dqi_format = fmt;
	dqopt->info[type].dqi_fmt_id = format_id;
	INIT_LIST_HEAD(&dqopt->info[type].dqi_dirty_list);
	mutex_lock(&dqopt->dqio_mutex);
	error = dqopt->ops[type]->read_file_info(sb, type);
	if (error < 0) {
		mutex_unlock(&dqopt->dqio_mutex);
		goto out_file_init;
	}
	if (dqopt->flags & DQUOT_QUOTA_SYS_FILE)
		dqopt->info[type].dqi_flags |= DQF_SYS_FILE;
	mutex_unlock(&dqopt->dqio_mutex);
	spin_lock(&dq_state_lock);
	dqopt->flags |= dquot_state_flag(flags, type);
	spin_unlock(&dq_state_lock);

	add_dquot_ref(sb, type);

	return 0;

out_file_init:
	dqopt->files[type] = NULL;
	iput(inode);
out_file_flags:
	if (oldflags != -1) {
		inode_lock(inode);
		/* 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;
		inode_unlock(inode);
	}
out_fmt:
	put_quota_format(fmt);

	return error; 
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jan Kara
317
57.43%
17
50.00%
Andrew Morton
129
23.37%
4
11.76%
Linus Torvalds (pre-git)
60
10.87%
7
20.59%
Eric W. Biedermann
20
3.62%
1
2.94%
Li Xi
14
2.54%
1
2.94%
Ingo Molnar
6
1.09%
1
2.94%
Al Viro
4
0.72%
1
2.94%
Linus Torvalds
1
0.18%
1
2.94%
Christoph Hellwig
1
0.18%
1
2.94%
Total
552
100.00%
34
100.00%

/* Reenable quotas on remount RW */


int dquot_resume(struct super_block *sb, int type)
{
	struct quota_info *dqopt = sb_dqopt(sb);
	struct inode *inode;
	int ret = 0, cnt;
	unsigned int flags;

	/* s_umount should be held in exclusive mode */
	if (WARN_ON_ONCE(down_read_trylock(&sb->s_umount)))
		up_read(&sb->s_umount);

	for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
		if (type != -1 && cnt != type)
			continue;
		if (!sb_has_quota_suspended(sb, cnt))
			continue;

		inode = dqopt->files[cnt];
		dqopt->files[cnt] = NULL;
		spin_lock(&dq_state_lock);
		flags = dqopt->flags & dquot_state_flag(DQUOT_USAGE_ENABLED |
							DQUOT_LIMITS_ENABLED,
							cnt);
		dqopt->flags &= ~dquot_state_flag(DQUOT_STATE_FLAGS, cnt);
		spin_unlock(&dq_state_lock);

		flags = dquot_generic_flag(flags, cnt);
		ret = vfs_load_quota_inode(inode, cnt,
				dqopt->info[cnt].dqi_fmt_id, flags);
		iput(inode);
	}

	return ret;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Jan Kara
152
78.76%
4
80.00%
Christoph Hellwig
41
21.24%
1
20.00%
Total
193
100.00%
5
100.00%


EXPORT_SYMBOL(dquot_resume);



int dquot_quota_on(struct super_block *sb, int type, int format_id,
		   const struct path *path)
{
	int error = security_quota_on(path->dentry);
	if (error)
		return error;
	/* Quota file not on the same filesystem? */
	if (path->dentry->d_sb != sb)
		error = -EXDEV;
	else
		error = vfs_load_quota_inode(d_inode(path->dentry), type,
					     format_id, DQUOT_USAGE_ENABLED |
					     DQUOT_LIMITS_ENABLED);
	return error;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Al Viro
70
88.61%
3
50.00%
Jan Kara
6
7.59%
2
33.33%
David Howells
3
3.80%
1
16.67%
Total
79
100.00%
6
100.00%


EXPORT_SYMBOL(dquot_quota_on);

/*
 * More powerful function for turning on quotas allowing setting
 * of individual quota flags
 */


int dquot_enable(struct inode *inode, int type, int format_id,
		 unsigned int flags)
{
	struct super_block *sb = inode->i_sb;

	/* Just unsuspend quotas? */
	BUG_ON(flags & DQUOT_SUSPENDED);
	/* s_umount should be held in exclusive mode */
	if (WARN_ON_ONCE(down_read_trylock(&sb->s_umount)))
		up_read(&sb->s_umount);

	if (!flags)
		return 0;
	/* Just updating flags needed? */
	if (sb_has_quota_loaded(sb, type)) {
		if (flags & DQUOT_USAGE_ENABLED &&
		    sb_has_quota_usage_enabled(sb, type))
			return -EBUSY;
		if (flags & DQUOT_LIMITS_ENABLED &&
		    sb_has_quota_limits_enabled(sb, type))
			return -EBUSY;
		spin_lock(&dq_state_lock);
		sb_dqopt(sb)->flags |= dquot_state_flag(flags, type);
		spin_unlock(&dq_state_lock);
		return 0;
	}

	return vfs_load_quota_inode(inode, type, format_id, flags);
}
Contributors
Person
Tokens
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Commits
CommitProp
Jan Kara
150
97.40%
4
66.67%
Christoph Hellwig
4
2.60%
2
33.33%
Total
154
100.00%
6
100.00%


EXPORT_SYMBOL(dquot_enable);

/*
 * This function is used when filesystem needs to initialize quotas
 * during mount time.
 */


int dquot_quota_on_mount(struct super_block *sb, char *qf_name,
		int format_id, int type)
{
	struct dentry *dentry;
	int error;

	dentry = lookup_one_len_unlocked(qf_name, sb->s_root, strlen(qf_name));
	if (IS_ERR(dentry))
		return PTR_ERR(dentry);

	if (d_really_is_negative(dentry)) {
		error = -ENOENT;
		goto out;
	}

	error = security_quota_on(dentry);
	if (!error)
		error = vfs_load_quota_inode(d_inode(dentry), type, format_id,
				DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);

out:
	dput(dentry);
	return error;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Hellwig
53
46.49%
3
25.00%
Jan Kara
25
21.93%
3
25.00%
Andrew Morton
22
19.30%
1
8.33%
David Howells
6
5.26%
1
8.33%
Linus Torvalds (pre-git)
4
3.51%
2
16.67%
Linus Torvalds
3
2.63%
1
8.33%
Al Viro
1
0.88%
1
8.33%
Total
114
100.00%
12
100.00%


EXPORT_SYMBOL(dquot_quota_on_mount);



static int dquot_quota_enable(struct super_block *sb, unsigned int flags)
{
	int ret;
	int type;
	struct quota_info *dqopt = sb_dqopt(sb);

	if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE))
		return -ENOSYS;
	/* Accounting cannot be turned on while fs is mounted */
	flags &= ~(FS_QUOTA_UDQ_ACCT | FS_QUOTA_GDQ_ACCT | FS_QUOTA_PDQ_ACCT);
	if (!flags)
		return -EINVAL;
	for (type = 0; type < MAXQUOTAS; type++) {
		if (!(flags & qtype_enforce_flag(type)))
			continue;
		/* Can't enforce without accounting */
		if (!sb_has_quota_usage_enabled(sb, type))
			return -EINVAL;
		ret = dquot_enable(dqopt->files[type], type,
				   dqopt->info[type].dqi_fmt_id,
				   DQUOT_LIMITS_ENABLED);
		if (ret < 0)
			goto out_err;
	}
	return 0;
out_err:
	/* Backout enforcement enablement we already did */
	for (type--; type >= 0; type--)  {
		if (flags & qtype_enforce_flag(type))
			dquot_disable(sb, type, DQUOT_LIMITS_ENABLED);
	}
	/* Error code translation for better compatibility with XFS */
	if (ret == -EBUSY)
		ret = -EEXIST;
	return ret;
}

Contributors
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Jan Kara
198
100.00%
1
100.00%
Total
198
100.00%
1
100.00%



static int dquot_quota_disable(struct super_block *sb, unsigned int flags)
{
	int ret;
	int type;
	struct quota_info *dqopt = sb_dqopt(sb);

	if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE))
		return -ENOSYS;
	/*
         * We don't support turning off accounting via quotactl. In principle
         * quota infrastructure can do this but filesystems don't expect
         * userspace to be able to do it.
         */
	if (flags &
		  (FS_QUOTA_UDQ_ACCT | FS_QUOTA_GDQ_ACCT | FS_QUOTA_PDQ_ACCT))
		return -EOPNOTSUPP;

	/* Filter out limits not enabled */
	for (type = 0; type < MAXQUOTAS; type++)
		if (!sb_has_quota_limits_enabled(sb, type))
			flags &= ~qtype_enforce_flag(type);
	/* Nothing left? */
	if (!flags)
		return -EEXIST;
	for (type = 0; type < MAXQUOTAS; type++) {
		if (flags & qtype_enforce_flag(type)) {
			ret = dquot_disable(sb, type, DQUOT_LIMITS_ENABLED);
			if (ret < 0)
				goto out_err;
		}
	}
	return 0;
out_err:
	/* Backout enforcement disabling we already did */
	for (type--; type >= 0; type--)  {
		if (flags & qtype_enforce_flag(type))
			dquot_enable(dqopt->files[type], type,
				     dqopt->info[type].dqi_fmt_id,
				     DQUOT_LIMITS_ENABLED);
	}
	return ret;
}

Contributors
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Jan Kara
206
100.00%
1
100.00%
Total
206
100.00%
1
100.00%

/* Generic routine for getting common part of quota structure */


static void do_get_dqblk(struct dquot *dquot, struct qc_dqblk *di)
{
	struct mem_dqblk *dm = &dquot->dq_dqb;

	memset(di, 0, sizeof(*di));
	spin_lock(&dq_data_lock);
	di->d_spc_hardlimit = dm->dqb_bhardlimit;
	di->d_spc_softlimit = dm->dqb_bsoftlimit;
	di->d_ino_hardlimit = dm->dqb_ihardlimit;
	di->d_ino_softlimit = dm->dqb_isoftlimit;
	di->d_space = dm->dqb_curspace + dm->dqb_rsvspace;
	di->d_ino_count = dm->dqb_curinodes;
	di->d_spc_timer = dm->dqb_btime;
	di->d_ino_timer = dm->dqb_itime;
	spin_unlock(&dq_data_lock);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jan Kara
73
61.34%
2
28.57%
Christoph Hellwig
22
18.49%
1
14.29%
Linus Torvalds (pre-git)
12
10.08%
3
42.86%
Andrew Morton
12
10.08%
1
14.29%
Total
119
100.00%
7
100.00%



int dquot_get_dqblk(struct super_block *sb, struct kqid qid,
		    struct qc_dqblk *di)
{
	struct dquot *dquot;

	dquot = dqget(sb, qid);
	if (IS_ERR(dquot))
		return PTR_ERR(dquot);
	do_get_dqblk(dquot, di);
	dqput(dquot);

	return 0;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Jan Kara
47
77.05%
4
44.44%
Linus Torvalds (pre-git)
5
8.20%
2
22.22%
Eric W. Biedermann
4
6.56%
1
11.11%
Andrew Morton
4
6.56%
1
11.11%
Christoph Hellwig
1
1.64%
1
11.11%
Total
61
100.00%
9
100.00%


EXPORT_SYMBOL(dquot_get_dqblk);



int dquot_get_next_dqblk(struct super_block *sb, struct kqid *qid,
			 struct qc_dqblk *di)
{
	struct dquot *dquot;
	int err;

	if (!sb->dq_op->get_next_id)
		return -ENOSYS;
	err = sb->dq_op->get_next_id(sb, qid);
	if (err < 0)
		return err;
	dquot = dqget(sb, *qid);
	if (IS_ERR(dquot))
		return PTR_ERR(dquot);
	do_get_dqblk(dquot, di);
	dqput(dquot);

	return 0;
}
Contributors
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Tokens
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CommitProp
Jan Kara
101
100.00%
1
100.00%
Total
101
100.00%
1
100.00%


EXPORT_SYMBOL(dquot_get_next_dqblk);


#define VFS_QC_MASK \
	(QC_SPACE | QC_SPC_SOFT | QC_SPC_HARD | \
         QC_INO_COUNT | QC_INO_SOFT | QC_INO_HARD | \
         QC_SPC_TIMER | QC_INO_TIMER)

/* Generic routine for setting common part of quota structure */


static int do_set_dqblk(struct dquot *dquot, struct qc_dqblk *di)
{
	struct mem_dqblk *dm = &dquot->dq_dqb;
	int check_blim = 0, check_ilim = 0;
	struct mem_dqinfo *dqi = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_id.type];

	if (di->d_fieldmask & ~VFS_QC_MASK)
		return -EINVAL;

	if (((di->d_fieldmask & QC_SPC_SOFT) &&
	     di->d_spc_softlimit > dqi->dqi_max_spc_limit) ||
	    ((di->d_fieldmask & QC_SPC_HARD) &&
	     di->d_spc_hardlimit > dqi->dqi_max_spc_limit) ||
	    ((di->d_fieldmask & QC_INO_SOFT) &&
	     (di->d_ino_softlimit > dqi->dqi_max_ino_limit)) ||
	    ((di->d_fieldmask & QC_INO_HARD) &&
	     (di->d_ino_hardlimit > dqi->dqi_max_ino_limit)))
		return -ERANGE;

	spin_lock(&dq_data_lock);
	if (di->d_fieldmask & QC_SPACE) {
		dm->dqb_curspace = di->d_space - dm->dqb_rsvspace;
		check_blim = 1;
		set_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags);
	}

	if (di->d_fieldmask & QC_SPC_SOFT)
		dm->dqb_bsoftlimit = di->d_spc_softlimit;
	if (di->d_fieldmask & QC_SPC_HARD)
		dm->dqb_bhardlimit = di->d_spc_hardlimit;
	if (di->d_fieldmask & (QC_SPC_SOFT | QC_SPC_HARD)) {
		check_blim = 1;
		set_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags);
	}

	if (di->d_fieldmask & QC_INO_COUNT) {
		dm->dqb_curinodes = di->d_ino_count;
		check_ilim = 1;
		set_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags);
	}

	if (di->d_fieldmask & QC_INO_SOFT)
		dm->dqb_isoftlimit = di->d_ino_softlimit;
	if (di->d_fieldmask & QC_INO_HARD)
		dm->dqb_ihardlimit = di->d_ino_hardlimit;
	if (di->d_fieldmask & (QC_INO_SOFT | QC_INO_HARD)) {
		check_ilim = 1;
		set_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags);
	}

	if (di->d_fieldmask & QC_SPC_TIMER) {
		dm->dqb_btime = di->d_spc_timer;
		check_blim = 1;
		set_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags);
	}

	if (di->d_fieldmask & QC_INO_TIMER) {
		dm->dqb_itime = di->d_ino_timer;
		check_ilim = 1;
		set_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags);
	}

	if (check_blim) {
		if (!dm->dqb_bsoftlimit ||
		    dm->dqb_curspace < dm->dqb_bsoftlimit) {
			dm->dqb_btime = 0;
			clear_bit(DQ_BLKS_B, &dquot->dq_flags);
		} else if (!(di->d_fieldmask & QC_SPC_TIMER))
			/* Set grace only if user hasn't provided his own... */
			dm->dqb_btime = ktime_get_real_seconds() + dqi->dqi_bgrace;
	}
	if (check_ilim) {
		if (!dm->dqb_isoftlimit ||
		    dm->dqb_curinodes < dm->dqb_isoftlimit) {
			dm->dqb_itime = 0;
			clear_bit(DQ_INODES_B, &dquot->dq_flags);
		} else if (!(di->d_fieldmask & QC_INO_TIMER))
			/* Set grace only if user hasn't provided his own... */
			dm->dqb_itime = ktime_get_real_seconds() + dqi->dqi_igrace;
	}
	if (dm->dqb_bhardlimit || dm->dqb_bsoftlimit || dm->dqb_ihardlimit ||
	    dm->dqb_isoftlimit)
		clear_bit(DQ_FAKE_B, &dquot->dq_flags);
	else
		set_bit(DQ_FAKE_B, &dquot->dq_flags);
	spin_unlock(&dq_data_lock);
	mark_dquot_dirty(dquot);

	return 0;
}

Contributors
Person
Tokens
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Commits
CommitProp
Jan Kara
347
57.74%
5
23.81%
Christoph Hellwig
86
14.31%
1
4.76%
Andrew Perepechko
75
12.48%
2
9.52%
Andrew Morton
40
6.66%
2
9.52%
Linus Torvalds (pre-git)
36
5.99%
6
28.57%
Linus Torvalds
6
1.00%
1
4.76%
Mingming Cao
4
0.67%
1
4.76%
Eric W. Biedermann
3
0.50%
1
4.76%
Andi Kleen
2
0.33%
1
4.76%
Arnd Bergmann
2
0.33%
1
4.76%
Total
601
100.00%
21
100.00%



int dquot_set_dqblk(struct super_block *sb, struct kqid qid,
		  struct qc_dqblk *di)
{
	struct dquot *dquot;
	int rc;

	dquot = dqget(sb, qid);
	if (IS_ERR(dquot)) {
		rc = PTR_ERR(dquot);
		goto out;
	}
	rc = do_set_dqblk(dquot, di);
	dqput(dquot);
out:
	return rc;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Jan Kara
46
62.16%
4
36.36%
Linus Torvalds (pre-git)
12
16.22%
3
27.27%
Andrew Perepechko
6
8.11%
1
9.09%
Andrew Morton
5
6.76%
1
9.09%
Eric W. Biedermann
4
5.41%
1
9.09%
Christoph Hellwig
1
1.35%
1
9.09%
Total
74
100.00%
11
100.00%


EXPORT_SYMBOL(dquot_set_dqblk);

/* Generic routine for getting common part of quota file information */


int dquot_get_state(struct super_block *sb, struct qc_state *state)
{
	struct mem_dqinfo *mi;
	struct qc_type_state *tstate;
	struct quota_info *dqopt = sb_dqopt(sb);
	int type;
  
	memset(state, 0, sizeof(*state));
	for (type = 0; type < MAXQUOTAS; type++) {
		if (!sb_has_quota_active(sb, type))
			continue;
		tstate = state->s_state + type;
		mi = sb_dqopt(sb)->info + type;
		tstate->flags = QCI_ACCT_ENABLED;
		spin_lock(&dq_data_lock);
		if (mi->dqi_flags & DQF_SYS_FILE)
			tstate->flags |= QCI_SYSFILE;
		if (mi->dqi_flags & DQF_ROOT_SQUASH)
			tstate->flags |= QCI_ROOT_SQUASH;
		if (sb_has_quota_limits_enabled(sb, type))
			tstate->flags |= QCI_LIMITS_ENFORCED;
		tstate->spc_timelimit = mi->dqi_bgrace;
		tstate->ino_timelimit = mi->dqi_igrace;
		tstate->ino = dqopt->files[type]->i_ino;
		tstate->blocks = dqopt->files[type]->i_blocks;
		tstate->nextents = 1;	/* We don't know... */
		spin_unlock(&dq_data_lock);
	}
	return 0;
}
Contributors
Person
Tokens
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Commits
CommitProp
Jan Kara
177
84.69%
3
42.86%
Andrew Morton
27
12.92%
1
14.29%
Linus Torvalds (pre-git)
5
2.39%
3
42.86%
Total
209
100.00%
7
100.00%


EXPORT_SYMBOL(dquot_get_state);

/* Generic routine for setting common part of quota file information */


int dquot_set_dqinfo(struct super_block *sb, int type, struct qc_info *ii)
{
	struct mem_dqinfo *mi;
	int err = 0;

	if ((ii->i_fieldmask & QC_WARNS_MASK) ||
	    (ii->i_fieldmask & QC_RT_SPC_TIMER))
		return -EINVAL;
	if (!sb_has_quota_active(sb, type))
		return -ESRCH;
	mi = sb_dqopt(sb)->info + type;
	if (ii->i_fieldmask & QC_FLAGS) {
		if ((ii->i_flags & QCI_ROOT_SQUASH &&
		     mi->dqi_format->qf_fmt_id != QFMT_VFS_OLD))
			return -EINVAL;
	}
	spin_lock(&dq_data_lock);
	if (ii->i_fieldmask & QC_SPC_TIMER)
		mi->dqi_bgrace = ii->i_spc_timelimit;
	if (ii->i_fieldmask & QC_INO_TIMER)
		mi->dqi_igrace = ii->i_ino_timelimit;
	if (ii->i_fieldmask & QC_FLAGS) {
		if (ii->i_flags & QCI_ROOT_SQUASH)
			mi->dqi_flags |= DQF_ROOT_SQUASH;
		else
			mi->dqi_flags &= ~DQF_ROOT_SQUASH;
	}
	spin_unlock(&dq_data_lock);
	mark_info_dirty(sb, type);
	/* Force write to disk */
	sb->dq_op->write_info(sb, type);
	return err;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Jan Kara
146
71.22%
5
41.67%
Andrew Morton
42
20.49%
2
16.67%
Linus Torvalds (pre-git)
10
4.88%
3
25.00%
Linus Torvalds
6
2.93%
1
8.33%
Christoph Hellwig
1
0.49%
1
8.33%
Total
205
100.00%
12
100.00%


EXPORT_SYMBOL(dquot_set_dqinfo);


const struct quotactl_ops dquot_quotactl_ops = {
	.quota_on	= dquot_quota_on,
	.quota_off	= dquot_quota_off,
	.quota_sync	= dquot_quota_sync,
	.get_state	= dquot_get_state,
	.set_info	= dquot_set_dqinfo,
	.get_dqblk	= dquot_get_dqblk,
	.get_nextdqblk	= dquot_get_next_dqblk,
	.set_dqblk	= dquot_set_dqblk
};

EXPORT_SYMBOL(dquot_quotactl_ops);


const struct quotactl_ops dquot_quotactl_sysfile_ops = {
	.quota_enable	= dquot_quota_enable,
	.quota_disable	= dquot_quota_disable,
	.quota_sync	= dquot_quota_sync,
	.get_state	= dquot_get_state,
	.set_info	= dquot_set_dqinfo,
	.get_dqblk	= dquot_get_dqblk,
	.get_nextdqblk	= dquot_get_next_dqblk,
	.set_dqblk	= dquot_set_dqblk
};

EXPORT_SYMBOL(dquot_quotactl_sysfile_ops);



static int do_proc_dqstats(struct ctl_table *table, int write,
		     void __user *buffer, size_t *lenp, loff_t *ppos)
{
	unsigned int type = (int *)table->data - dqstats.stat;

	/* Update global table */
	dqstats.stat[type] =
			percpu_counter_sum_positive(&dqstats.counter[type]);
	return proc_dointvec(table, write, buffer, lenp, ppos);
}

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Dmitriy Monakhov
76
100.00%
2
100.00%
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76
100.00%
2
100.00%


static struct ctl_table fs_dqstats_table[] = {
	{
		.procname	= "lookups",
		.data		= &dqstats.stat[DQST_LOOKUPS],
		.maxlen		= sizeof(int),
		.mode		= 0444,
		.proc_handler	= do_proc_dqstats,
        },
	{
		.procname	= "drops",
		.data		= &dqstats.stat[DQST_DROPS],
		.maxlen		= sizeof(int),
		.mode		= 0444,
		.proc_handler	= do_proc_dqstats,
        },
	{
		.procname	= "reads",
		.data		= &dqstats.stat[DQST_READS],
		.maxlen		= sizeof(int),
		.mode		= 0444,
		.proc_handler	= do_proc_dqstats,
        },
	{
		.procname	= "writes",
		.data		= &dqstats.stat[DQST_WRITES],
		.maxlen		= sizeof(int),
		.mode		= 0444,
		.proc_handler	= do_proc_dqstats,
        },
	{
		.procname	= "cache_hits",
		.data		= &dqstats.stat[DQST_CACHE_HITS],
		.maxlen		= sizeof(int),
		.mode		= 0444,
		.proc_handler	= do_proc_dqstats,
        },
	{
		.procname	= "allocated_dquots",
		.data		= &dqstats.stat[DQST_ALLOC_DQUOTS],
		.maxlen		= sizeof(int),
		.mode		= 0444,
		.proc_handler	= do_proc_dqstats,
        },
	{
		.procname	= "free_dquots",
		.data		= &dqstats.stat[DQST_FREE_DQUOTS],
		.maxlen		= sizeof(int),
		.mode		= 0444,
		.proc_handler	= do_proc_dqstats,
        },
	{
		.procname	= "syncs",
		.data		= &dqstats.stat[DQST_SYNCS],
		.maxlen		= sizeof(int),
		.mode		= 0444,
		.proc_handler	= do_proc_dqstats,
        },
#ifdef CONFIG_PRINT_QUOTA_WARNING
	{
		.procname	= "warnings",
		.data		= &flag_print_warnings,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= proc_dointvec,
        },
#endif
	{ },
};


static struct ctl_table fs_table[] = {
	{
		.procname	= "quota",
		.mode		= 0555,
		.child		= fs_dqstats_table,
        },
	{ },
};


static struct ctl_table sys_table[] = {
	{
		.procname	= "fs",
		.mode		= 0555,
		.child		= fs_table,
        },
	{ },
};



static int __init dquot_init(void)
{
	int i, ret;
	unsigned long nr_hash, order;

	printk(KERN_NOTICE "VFS: Disk quotas %s\n", __DQUOT_VERSION__);

	register_sysctl_table(sys_table);

	dquot_cachep = kmem_cache_create("dquot",
			sizeof(struct dquot), sizeof(unsigned long) * 4,
			(SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
				SLAB_MEM_SPREAD|SLAB_PANIC),
			NULL);

	order = 0;
	dquot_hash = (struct hlist_head *)__get_free_pages(GFP_ATOMIC, order);
	if (!dquot_hash)
		panic("Cannot create dquot hash table");

	for (i = 0; i < _DQST_DQSTAT_LAST; i++) {
		ret = percpu_counter_init(&dqstats.counter[i], 0, GFP_KERNEL);
		if (ret)
			panic("Cannot create dquot stat counters");
	}

	/* Find power-of-two hlist_heads which can fit into allocation */
	nr_hash = (1UL << order) * PAGE_SIZE / sizeof(struct hlist_head);
	dq_hash_bits = 0;
	do {
		dq_hash_bits++;
	} while (nr_hash >> dq_hash_bits);
	dq_hash_bits--;

	nr_hash = 1UL << dq_hash_bits;
	dq_hash_mask = nr_hash - 1;
	for (i = 0; i < nr_hash; i++)
		INIT_HLIST_HEAD(dquot_hash + i);

	pr_info("VFS: Dquot-cache hash table entries: %ld (order %ld,"
		" %ld bytes)\n", nr_hash, order, (PAGE_SIZE << order));

	register_shrinker(&dqcache_shrinker);

	return 0;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Andrew Morton
152
66.38%
8
44.44%
Dmitriy Monakhov
41
17.90%
2
11.11%
Jan Kara
24
10.48%
3
16.67%
Paul Jackson
4
1.75%
2
11.11%
Anton Blanchard
3
1.31%
1
5.56%
Rusty Russell
3
1.31%
1
5.56%
Tejun Heo
2
0.87%
1
5.56%
Total
229
100.00%
18
100.00%


fs_initcall(dquot_init);
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Jan Kara
6126
45.27%
90
35.16%
Andrew Morton
1923
14.21%
19
7.42%
Linus Torvalds (pre-git)
1824
13.48%
23
8.98%
Dmitriy Monakhov
878
6.49%
9
3.52%
Christoph Hellwig
669
4.94%
22
8.59%
Linus Torvalds
444
3.28%
9
3.52%
Mingming Cao
338
2.50%
3
1.17%
Eric W. Biedermann
209
1.54%
8
3.12%
Art Haas
165
1.22%
2
0.78%
Niu YaWei
141
1.04%
4
1.56%
Konstantin Khlebnikov
141
1.04%
1
0.39%
Dave Chinner
103
0.76%
5
1.95%
Al Viro
99
0.73%
12
4.69%
Andrew Perepechko
81
0.60%
2
0.78%
Jiaying Zhang
70
0.52%
1
0.39%
Li Xi
64
0.47%
1
0.39%
Ingo Molnar
32
0.24%
2
0.78%
Joe Perches
26
0.19%
2
0.78%
Eric Sandeen
18
0.13%
2
0.78%
Rusty Russell
18
0.13%
1
0.39%
Nicholas Piggin
15
0.11%
1
0.39%
Sergey Senozhatsky
13
0.10%
1
0.39%
Adrian Bunk
11
0.08%
4
1.56%
David Howells
11
0.08%
2
0.78%
Peter Zijlstra
10
0.07%
1
0.39%
Steven Whitehouse
9
0.07%
1
0.39%
Domen Puncer
9
0.07%
1
0.39%
Arnd Bergmann
8
0.06%
1
0.39%
Dave Jones
7
0.05%
3
1.17%
Eric Sesterhenn / Snakebyte
7
0.05%
1
0.39%
Andi Kleen
6
0.04%
1
0.39%
Mika Kukkonen
6
0.04%
1
0.39%
Jie Liu
5
0.04%
2
0.78%
Thomas Gleixner
5
0.04%
1
0.39%
Akinobu Mita
4
0.03%
1
0.39%
Paul Jackson
4
0.03%
2
0.78%
Ying Han
4
0.03%
1
0.39%
Anton Blanchard
3
0.02%
1
0.39%
Alan Cox
3
0.02%
1
0.39%
Greg Kroah-Hartman
3
0.02%
1
0.39%
Glauber de Oliveira Costa
3
0.02%
1
0.39%
Randy Dunlap
3
0.02%
1
0.39%
Arnaldo Carvalho de Melo
3
0.02%
1
0.39%
Nikolay Borisov
2
0.01%
1
0.39%
Christoph Lameter
2
0.01%
1
0.39%
Alexey Dobriyan
2
0.01%
2
0.78%
Tejun Heo
2
0.01%
1
0.39%
Paul Gortmaker
1
0.01%
1
0.39%
Pavel Emelyanov
1
0.01%
1
0.39%
Total
13531
100.00%
256
100.00%
Directory: fs/quota

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