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-rw-r--r--ANDROID_3.4.5/fs/quota/dquot.c2700
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diff --git a/ANDROID_3.4.5/fs/quota/dquot.c b/ANDROID_3.4.5/fs/quota/dquot.c
deleted file mode 100644
index d69a1d1d..00000000
--- a/ANDROID_3.4.5/fs/quota/dquot.c
+++ /dev/null
@@ -1,2700 +0,0 @@
-/*
- * Implementation of the diskquota system for the LINUX operating system. QUOTA
- * is implemented using the BSD system call interface as the means of
- * communication with the user level. This file contains the generic routines
- * called by the different filesystems on allocation of an inode or block.
- * These routines take care of the administration needed to have a consistent
- * diskquota tracking system. The ideas of both user and group quotas are based
- * on the Melbourne quota system as used on BSD derived systems. The internal
- * implementation is based on one of the several variants of the LINUX
- * inode-subsystem with added complexity of the diskquota system.
- *
- * Author: Marco van Wieringen <mvw@planets.elm.net>
- *
- * Fixes: Dmitry Gorodchanin <pgmdsg@ibi.com>, 11 Feb 96
- *
- * Revised list management to avoid races
- * -- Bill Hawes, <whawes@star.net>, 9/98
- *
- * Fixed races in dquot_transfer(), dqget() and dquot_alloc_...().
- * As the consequence the locking was moved from dquot_decr_...(),
- * dquot_incr_...() to calling functions.
- * invalidate_dquots() now writes modified dquots.
- * Serialized quota_off() and quota_on() for mount point.
- * Fixed a few bugs in grow_dquots().
- * Fixed deadlock in write_dquot() - we no longer account quotas on
- * quota files
- * remove_dquot_ref() moved to inode.c - it now traverses through inodes
- * add_dquot_ref() restarts after blocking
- * Added check for bogus uid and fixed check for group in quotactl.
- * Jan Kara, <jack@suse.cz>, sponsored by SuSE CR, 10-11/99
- *
- * Used struct list_head instead of own list struct
- * Invalidation of referenced dquots is no longer possible
- * Improved free_dquots list management
- * Quota and i_blocks are now updated in one place to avoid races
- * Warnings are now delayed so we won't block in critical section
- * Write updated not to require dquot lock
- * Jan Kara, <jack@suse.cz>, 9/2000
- *
- * Added dynamic quota structure allocation
- * Jan Kara <jack@suse.cz> 12/2000
- *
- * Rewritten quota interface. Implemented new quota format and
- * formats registering.
- * Jan Kara, <jack@suse.cz>, 2001,2002
- *
- * New SMP locking.
- * Jan Kara, <jack@suse.cz>, 10/2002
- *
- * Added journalled quota support, fix lock inversion problems
- * Jan Kara, <jack@suse.cz>, 2003,2004
- *
- * (C) Copyright 1994 - 1997 Marco van Wieringen
- */
-
-#include <linux/errno.h>
-#include <linux/kernel.h>
-#include <linux/fs.h>
-#include <linux/mount.h>
-#include <linux/mm.h>
-#include <linux/time.h>
-#include <linux/types.h>
-#include <linux/string.h>
-#include <linux/fcntl.h>
-#include <linux/stat.h>
-#include <linux/tty.h>
-#include <linux/file.h>
-#include <linux/slab.h>
-#include <linux/sysctl.h>
-#include <linux/init.h>
-#include <linux/module.h>
-#include <linux/proc_fs.h>
-#include <linux/security.h>
-#include <linux/sched.h>
-#include <linux/kmod.h>
-#include <linux/namei.h>
-#include <linux/capability.h>
-#include <linux/quotaops.h>
-#include "../internal.h" /* ugh */
-
-#include <asm/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
- *
- * Any operation working on dquots via inode pointers must hold dqptr_sem. If
- * operation is just reading pointers from inode (or not using them at all) the
- * read lock is enough. If pointers are altered function must hold write lock.
- * Special care needs to be taken about S_NOQUOTA inode flag (marking that
- * inode is a quota file). Functions adding pointers from inode to dquots have
- * to check this flag under dqptr_sem and then (if S_NOQUOTA is not set) they
- * have to do all pointer modifications before dropping dqptr_sem. This makes
- * sure they cannot race with quotaon which first sets S_NOQUOTA flag and
- * then drops all pointers to dquots from an inode.
- *
- * Each dquot has its dq_lock mutex. Locked dquots might not be referenced
- * from inodes (dquot_alloc_space() and such don't check the dq_lock).
- * Currently dquot is locked only when it is being read to memory (or space for
- * it is being allocated) on the first dqget() and when it is being released on
- * the last dqput(). The allocation and release oparations are serialized by
- * the dq_lock and by checking the use count in dquot_release(). Write
- * operations on dquots don't hold dq_lock as they copy data under dq_data_lock
- * spinlock to internal buffers before writing.
- *
- * Lock ordering (including related VFS locks) is the following:
- * i_mutex > dqonoff_sem > journal_lock > dqptr_sem > dquot->dq_lock >
- * dqio_mutex
- * The lock ordering of dqptr_sem imposed by quota code is only dqonoff_sem >
- * dqptr_sem. But filesystem has to count with the fact that functions such as
- * dquot_alloc_space() acquire dqptr_sem and they usually have to be called
- * from inside a transaction to keep filesystem consistency after a crash. Also
- * filesystems usually want to do some IO on dquot from ->mark_dirty which is
- * called with dqptr_sem held.
- * i_mutex on quota files is special (it's below dqio_mutex)
- */
-
-static __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);
-
-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);
- }
-}
-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;
-}
-EXPORT_SYMBOL(register_quota_format);
-
-void unregister_quota_format(struct quota_format_type *fmt)
-{
- struct quota_format_type **actqf;
-
- spin_lock(&dq_list_lock);
- for (actqf = &quota_formats; *actqf && *actqf != fmt;
- actqf = &(*actqf)->qf_next)
- ;
- if (*actqf)
- *actqf = (*actqf)->qf_next;
- spin_unlock(&dq_list_lock);
-}
-EXPORT_SYMBOL(unregister_quota_format);
-
-static struct quota_format_type *find_quota_format(int id)
-{
- struct quota_format_type *actqf;
-
- spin_lock(&dq_list_lock);
- for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id;
- actqf = actqf->qf_next)
- ;
- if (!actqf || !try_module_get(actqf->qf_owner)) {
- int qm;
-
- spin_unlock(&dq_list_lock);
-
- for (qm = 0; module_names[qm].qm_fmt_id &&
- module_names[qm].qm_fmt_id != id; qm++)
- ;
- if (!module_names[qm].qm_fmt_id ||
- request_module(module_names[qm].qm_mod_name))
- return NULL;
-
- spin_lock(&dq_list_lock);
- for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id;
- actqf = actqf->qf_next)
- ;
- if (actqf && !try_module_get(actqf->qf_owner))
- actqf = NULL;
- }
- spin_unlock(&dq_list_lock);
- return actqf;
-}
-
-static void put_quota_format(struct quota_format_type *fmt)
-{
- module_put(fmt->qf_owner);
-}
-
-/*
- * Dquot List Management:
- * The quota code uses three lists for dquot management: the inuse_list,
- * free_dquots, and dquot_hash[] array. A single dquot structure may be
- * on all three lists, depending on its current state.
- *
- * All dquots are placed to the end of inuse_list when first created, and this
- * list is used for invalidate operation, which must look at every dquot.
- *
- * Unused dquots (dq_count == 0) are added to the free_dquots list when freed,
- * and this list is searched whenever we need an available dquot. Dquots are
- * removed from the list as soon as they are used again, and
- * dqstats.free_dquots gives the number of dquots on the list. When
- * dquot is invalidated it's completely released from memory.
- *
- * Dquots with a specific identity (device, type and id) are placed on
- * one of the dquot_hash[] hash chains. The provides an efficient search
- * mechanism to locate a specific dquot.
- */
-
-static LIST_HEAD(inuse_list);
-static LIST_HEAD(free_dquots);
-static unsigned int dq_hash_bits, dq_hash_mask;
-static struct hlist_head *dquot_hash;
-
-struct dqstats dqstats;
-EXPORT_SYMBOL(dqstats);
-
-static qsize_t inode_get_rsv_space(struct inode *inode);
-static void __dquot_initialize(struct inode *inode, int type);
-
-static inline unsigned int
-hashfn(const struct super_block *sb, unsigned int id, int type)
-{
- unsigned long tmp;
-
- tmp = (((unsigned long)sb>>L1_CACHE_SHIFT) ^ id) * (MAXQUOTAS - type);
- return (tmp + (tmp >> dq_hash_bits)) & dq_hash_mask;
-}
-
-/*
- * Following list functions expect dq_list_lock to be held
- */
-static inline void insert_dquot_hash(struct dquot *dquot)
-{
- struct hlist_head *head;
- head = dquot_hash + hashfn(dquot->dq_sb, dquot->dq_id, dquot->dq_type);
- hlist_add_head(&dquot->dq_hash, head);
-}
-
-static inline void remove_dquot_hash(struct dquot *dquot)
-{
- hlist_del_init(&dquot->dq_hash);
-}
-
-static struct dquot *find_dquot(unsigned int hashent, struct super_block *sb,
- unsigned int id, int type)
-{
- struct hlist_node *node;
- struct dquot *dquot;
-
- hlist_for_each (node, dquot_hash+hashent) {
- dquot = hlist_entry(node, struct dquot, dq_hash);
- if (dquot->dq_sb == sb && dquot->dq_id == id &&
- dquot->dq_type == type)
- return dquot;
- }
- return NULL;
-}
-
-/* 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);
-}
-
-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);
-}
-
-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);
-}
-
-static inline void remove_inuse(struct dquot *dquot)
-{
- dqstats_dec(DQST_ALLOC_DQUOTS);
- list_del(&dquot->dq_inuse);
-}
-/*
- * End of list functions needing dq_list_lock
- */
-
-static void wait_on_dquot(struct dquot *dquot)
-{
- mutex_lock(&dquot->dq_lock);
- mutex_unlock(&dquot->dq_lock);
-}
-
-static inline int dquot_dirty(struct dquot *dquot)
-{
- return test_bit(DQ_MOD_B, &dquot->dq_flags);
-}
-
-static inline int mark_dquot_dirty(struct dquot *dquot)
-{
- return dquot->dq_sb->dq_op->mark_dirty(dquot);
-}
-
-/* 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_type].dqi_dirty_list);
- ret = 0;
- }
- spin_unlock(&dq_list_lock);
- return ret;
-}
-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;
-}
-
-static inline void dqput_all(struct dquot **dquot)
-{
- unsigned int cnt;
-
- for (cnt = 0; cnt < MAXQUOTAS; cnt++)
- dqput(dquot[cnt]);
-}
-
-/* This function needs dq_list_lock */
-static inline int clear_dquot_dirty(struct dquot *dquot)
-{
- if (!test_and_clear_bit(DQ_MOD_B, &dquot->dq_flags))
- return 0;
- list_del_init(&dquot->dq_dirty);
- return 1;
-}
-
-void mark_info_dirty(struct super_block *sb, int type)
-{
- set_bit(DQF_INFO_DIRTY_B, &sb_dqopt(sb)->info[type].dqi_flags);
-}
-EXPORT_SYMBOL(mark_info_dirty);
-
-/*
- * Read dquot from disk and alloc space for it
- */
-
-int dquot_acquire(struct dquot *dquot)
-{
- int ret = 0, ret2 = 0;
- struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
-
- mutex_lock(&dquot->dq_lock);
- mutex_lock(&dqopt->dqio_mutex);
- if (!test_bit(DQ_READ_B, &dquot->dq_flags))
- ret = dqopt->ops[dquot->dq_type]->read_dqblk(dquot);
- if (ret < 0)
- goto out_iolock;
- set_bit(DQ_READ_B, &dquot->dq_flags);
- /* Instantiate dquot if needed */
- if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && !dquot->dq_off) {
- ret = dqopt->ops[dquot->dq_type]->commit_dqblk(dquot);
- /* Write the info if needed */
- if (info_dirty(&dqopt->info[dquot->dq_type])) {
- ret2 = dqopt->ops[dquot->dq_type]->write_file_info(
- dquot->dq_sb, dquot->dq_type);
- }
- if (ret < 0)
- goto out_iolock;
- if (ret2 < 0) {
- ret = ret2;
- goto out_iolock;
- }
- }
- set_bit(DQ_ACTIVE_B, &dquot->dq_flags);
-out_iolock:
- mutex_unlock(&dqopt->dqio_mutex);
- mutex_unlock(&dquot->dq_lock);
- return ret;
-}
-EXPORT_SYMBOL(dquot_acquire);
-
-/*
- * Write dquot to disk
- */
-int dquot_commit(struct dquot *dquot)
-{
- int ret = 0;
- struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
-
- mutex_lock(&dqopt->dqio_mutex);
- spin_lock(&dq_list_lock);
- if (!clear_dquot_dirty(dquot)) {
- spin_unlock(&dq_list_lock);
- goto out_sem;
- }
- spin_unlock(&dq_list_lock);
- /* Inactive dquot can be only if there was error during read/init
- * => we have better not writing it */
- if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags))
- ret = dqopt->ops[dquot->dq_type]->commit_dqblk(dquot);
- else
- ret = -EIO;
-out_sem:
- mutex_unlock(&dqopt->dqio_mutex);
- return ret;
-}
-EXPORT_SYMBOL(dquot_commit);
-
-/*
- * Release dquot
- */
-int dquot_release(struct dquot *dquot)
-{
- int ret = 0, ret2 = 0;
- struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
-
- mutex_lock(&dquot->dq_lock);
- /* Check whether we are not racing with some other dqget() */
- if (atomic_read(&dquot->dq_count) > 1)
- goto out_dqlock;
- mutex_lock(&dqopt->dqio_mutex);
- if (dqopt->ops[dquot->dq_type]->release_dqblk) {
- ret = dqopt->ops[dquot->dq_type]->release_dqblk(dquot);
- /* Write the info */
- if (info_dirty(&dqopt->info[dquot->dq_type])) {
- ret2 = dqopt->ops[dquot->dq_type]->write_file_info(
- dquot->dq_sb, dquot->dq_type);
- }
- if (ret >= 0)
- ret = ret2;
- }
- clear_bit(DQ_ACTIVE_B, &dquot->dq_flags);
- mutex_unlock(&dqopt->dqio_mutex);
-out_dqlock:
- mutex_unlock(&dquot->dq_lock);
- return ret;
-}
-EXPORT_SYMBOL(dquot_release);
-
-void dquot_destroy(struct dquot *dquot)
-{
- kmem_cache_free(dquot_cachep, dquot);
-}
-EXPORT_SYMBOL(dquot_destroy);
-
-static inline void do_destroy_dquot(struct dquot *dquot)
-{
- dquot->dq_sb->dq_op->destroy_dquot(dquot);
-}
-
-/* Invalidate all dquots on the list. Note that this function is called after
- * quota is disabled and pointers from inodes removed so there cannot be new
- * quota users. There can still be some users of quotas due to inodes being
- * just deleted or pruned by prune_icache() (those are not attached to any
- * list) or parallel quotactl call. We have to wait for such users.
- */
-static void invalidate_dquots(struct super_block *sb, int type)
-{
- struct dquot *dquot, *tmp;
-
-restart:
- spin_lock(&dq_list_lock);
- list_for_each_entry_safe(dquot, tmp, &inuse_list, dq_inuse) {
- if (dquot->dq_sb != sb)
- continue;
- if (dquot->dq_type != type)
- continue;
- /* Wait for dquot users */
- if (atomic_read(&dquot->dq_count)) {
- DEFINE_WAIT(wait);
-
- atomic_inc(&dquot->dq_count);
- prepare_to_wait(&dquot->dq_wait_unused, &wait,
- TASK_UNINTERRUPTIBLE);
- spin_unlock(&dq_list_lock);
- /* Once dqput() wakes us up, we know it's time to free
- * the dquot.
- * IMPORTANT: we rely on the fact that there is always
- * at most one process waiting for dquot to free.
- * Otherwise dq_count would be > 1 and we would never
- * wake up.
- */
- if (atomic_read(&dquot->dq_count) > 1)
- schedule();
- finish_wait(&dquot->dq_wait_unused, &wait);
- dqput(dquot);
- /* At this moment dquot() need not exist (it could be
- * reclaimed by prune_dqcache(). Hence we must
- * restart. */
- goto restart;
- }
- /*
- * Quota now has no users and it has been written on last
- * dqput()
- */
- remove_dquot_hash(dquot);
- remove_free_dquot(dquot);
- remove_inuse(dquot);
- do_destroy_dquot(dquot);
- }
- spin_unlock(&dq_list_lock);
-}
-
-/* Call callback for every active dquot on given filesystem */
-int dquot_scan_active(struct super_block *sb,
- int (*fn)(struct dquot *dquot, unsigned long priv),
- unsigned long priv)
-{
- struct dquot *dquot, *old_dquot = NULL;
- int ret = 0;
-
- mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
- spin_lock(&dq_list_lock);
- list_for_each_entry(dquot, &inuse_list, dq_inuse) {
- if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags))
- continue;
- if (dquot->dq_sb != sb)
- continue;
- /* Now we have active dquot so we can just increase use count */
- atomic_inc(&dquot->dq_count);
- spin_unlock(&dq_list_lock);
- dqstats_inc(DQST_LOOKUPS);
- dqput(old_dquot);
- old_dquot = dquot;
- ret = fn(dquot, priv);
- if (ret < 0)
- goto out;
- spin_lock(&dq_list_lock);
- /* We are safe to continue now because our dquot could not
- * be moved out of the inuse list while we hold the reference */
- }
- spin_unlock(&dq_list_lock);
-out:
- dqput(old_dquot);
- mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
- return ret;
-}
-EXPORT_SYMBOL(dquot_scan_active);
-
-int dquot_quota_sync(struct super_block *sb, int type, int wait)
-{
- struct list_head *dirty;
- struct dquot *dquot;
- struct quota_info *dqopt = sb_dqopt(sb);
- int cnt;
-
- mutex_lock(&dqopt->dqonoff_mutex);
- for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
- if (type != -1 && cnt != type)
- continue;
- if (!sb_has_quota_active(sb, cnt))
- continue;
- spin_lock(&dq_list_lock);
- dirty = &dqopt->info[cnt].dqi_dirty_list;
- while (!list_empty(dirty)) {
- dquot = list_first_entry(dirty, struct dquot,
- dq_dirty);
- /* Dirty and inactive can be only bad dquot... */
- if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) {
- clear_dquot_dirty(dquot);
- continue;
- }
- /* Now we have active dquot from which someone is
- * holding reference so we can safely just increase
- * use count */
- atomic_inc(&dquot->dq_count);
- spin_unlock(&dq_list_lock);
- dqstats_inc(DQST_LOOKUPS);
- sb->dq_op->write_dquot(dquot);
- dqput(dquot);
- spin_lock(&dq_list_lock);
- }
- spin_unlock(&dq_list_lock);
- }
-
- for (cnt = 0; cnt < MAXQUOTAS; cnt++)
- if ((cnt == type || type == -1) && sb_has_quota_active(sb, cnt)
- && info_dirty(&dqopt->info[cnt]))
- sb->dq_op->write_info(sb, cnt);
- dqstats_inc(DQST_SYNCS);
- mutex_unlock(&dqopt->dqonoff_mutex);
-
- if (!wait || (sb_dqopt(sb)->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.
- */
- mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
- for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
- if (type != -1 && cnt != type)
- continue;
- if (!sb_has_quota_active(sb, cnt))
- continue;
- mutex_lock_nested(&sb_dqopt(sb)->files[cnt]->i_mutex,
- I_MUTEX_QUOTA);
- truncate_inode_pages(&sb_dqopt(sb)->files[cnt]->i_data, 0);
- mutex_unlock(&sb_dqopt(sb)->files[cnt]->i_mutex);
- }
- mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
-
- return 0;
-}
-EXPORT_SYMBOL(dquot_quota_sync);
-
-/* Free unused dquots from cache */
-static void prune_dqcache(int count)
-{
- struct list_head *head;
- struct dquot *dquot;
-
- head = free_dquots.prev;
- while (head != &free_dquots && count) {
- dquot = list_entry(head, struct dquot, dq_free);
- remove_dquot_hash(dquot);
- remove_free_dquot(dquot);
- remove_inuse(dquot);
- do_destroy_dquot(dquot);
- count--;
- head = free_dquots.prev;
- }
-}
-
-/*
- * This is called from kswapd when we think we need some
- * more memory
- */
-static int shrink_dqcache_memory(struct shrinker *shrink,
- struct shrink_control *sc)
-{
- int nr = sc->nr_to_scan;
-
- if (nr) {
- spin_lock(&dq_list_lock);
- prune_dqcache(nr);
- spin_unlock(&dq_list_lock);
- }
- return ((unsigned)
- percpu_counter_read_positive(&dqstats.counter[DQST_FREE_DQUOTS])
- /100) * sysctl_vfs_cache_pressure;
-}
-
-static struct shrinker dqcache_shrinker = {
- .shrink = shrink_dqcache_memory,
- .seeks = DEFAULT_SEEKS,
-};
-
-/*
- * Put reference to dquot
- * NOTE: If you change this function please check whether dqput_blocks() works right...
- */
-void dqput(struct dquot *dquot)
-{
- int ret;
-
- if (!dquot)
- return;
-#ifdef 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_type], 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_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);
-}
-EXPORT_SYMBOL(dqput);
-
-struct dquot *dquot_alloc(struct super_block *sb, int type)
-{
- return kmem_cache_zalloc(dquot_cachep, GFP_NOFS);
-}
-EXPORT_SYMBOL(dquot_alloc);
-
-static struct dquot *get_empty_dquot(struct super_block *sb, int type)
-{
- struct dquot *dquot;
-
- dquot = sb->dq_op->alloc_dquot(sb, type);
- if(!dquot)
- return 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_type = type;
- atomic_set(&dquot->dq_count, 1);
-
- return dquot;
-}
-
-/*
- * Get reference to dquot
- *
- * Locking is slightly tricky here. We are guarded from parallel quotaoff()
- * destroying our dquot by:
- * a) checking for quota flags under dq_list_lock and
- * b) getting a reference to dquot before we release dq_list_lock
- */
-struct dquot *dqget(struct super_block *sb, unsigned int id, int type)
-{
- unsigned int hashent = hashfn(sb, id, type);
- struct dquot *dquot = NULL, *empty = NULL;
-
- if (!sb_has_quota_active(sb, type))
- return NULL;
-we_slept:
- spin_lock(&dq_list_lock);
- spin_lock(&dq_state_lock);
- if (!sb_has_quota_active(sb, type)) {
- spin_unlock(&dq_state_lock);
- spin_unlock(&dq_list_lock);
- goto out;
- }
- spin_unlock(&dq_state_lock);
-
- dquot = find_dquot(hashent, sb, id, type);
- if (!dquot) {
- if (!empty) {
- spin_unlock(&dq_list_lock);
- empty = get_empty_dquot(sb, type);
- if (!empty)
- schedule(); /* Try to wait for a moment... */
- goto we_slept;
- }
- dquot = empty;
- empty = NULL;
- dquot->dq_id = id;
- /* all dquots go on the inuse_list */
- put_inuse(dquot);
- /* hash it first so it can be found */
- insert_dquot_hash(dquot);
- 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) &&
- sb->dq_op->acquire_dquot(dquot) < 0) {
- dqput(dquot);
- dquot = NULL;
- goto out;
- }
-#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;
-}
-EXPORT_SYMBOL(dqget);
-
-static int dqinit_needed(struct inode *inode, int type)
-{
- int cnt;
-
- if (IS_NOQUOTA(inode))
- return 0;
- if (type != -1)
- return !inode->i_dquot[type];
- for (cnt = 0; cnt < MAXQUOTAS; cnt++)
- if (!inode->i_dquot[cnt])
- return 1;
- return 0;
-}
-
-/* This routine is guarded by dqonoff_mutex mutex */
-static void add_dquot_ref(struct super_block *sb, int type)
-{
- struct inode *inode, *old_inode = NULL;
-#ifdef CONFIG_QUOTA_DEBUG
- int reserved = 0;
-#endif
-
- spin_lock(&inode_sb_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;
- }
-#ifdef CONFIG_QUOTA_DEBUG
- if (unlikely(inode_get_rsv_space(inode) > 0))
- reserved = 1;
-#endif
- __iget(inode);
- spin_unlock(&inode->i_lock);
- spin_unlock(&inode_sb_list_lock);
-
- 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
- * inode_sb_list_lock We cannot iput the inode now as we can be
- * holding the last reference and we cannot iput it under
- * inode_sb_list_lock. So we keep the reference and iput it
- * later.
- */
- old_inode = inode;
- spin_lock(&inode_sb_list_lock);
- }
- spin_unlock(&inode_sb_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
-}
-
-/*
- * Return 0 if dqput() won't block.
- * (note that 1 doesn't necessarily mean blocking)
- */
-static inline int dqput_blocks(struct dquot *dquot)
-{
- if (atomic_read(&dquot->dq_count) <= 1)
- return 1;
- return 0;
-}
-
-/*
- * Remove references to dquots from inode and add dquot to list for freeing
- * if we have the last reference to dquot
- * We can't race with anybody because we hold dqptr_sem for writing...
- */
-static int remove_inode_dquot_ref(struct inode *inode, int type,
- struct list_head *tofree_head)
-{
- struct dquot *dquot = inode->i_dquot[type];
-
- inode->i_dquot[type] = NULL;
- if (dquot) {
- if (dqput_blocks(dquot)) {
-#ifdef CONFIG_QUOTA_DEBUG
- if (atomic_read(&dquot->dq_count) != 1)
- quota_error(inode->i_sb, "Adding dquot with "
- "dq_count %d to dispose list",
- atomic_read(&dquot->dq_count));
-#endif
- spin_lock(&dq_list_lock);
- /* As dquot must have currently users it can't be on
- * the free list... */
- list_add(&dquot->dq_free, tofree_head);
- spin_unlock(&dq_list_lock);
- return 1;
- }
- else
- dqput(dquot); /* We have guaranteed we won't block */
- }
- return 0;
-}
-
-/*
- * 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);
- }
-}
-
-static void remove_dquot_ref(struct super_block *sb, int type,
- struct list_head *tofree_head)
-{
- struct inode *inode;
- int reserved = 0;
-
- spin_lock(&inode_sb_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
- * (dqptr_sem).
- */
- if (!IS_NOQUOTA(inode)) {
- if (unlikely(inode_get_rsv_space(inode) > 0))
- reserved = 1;
- remove_inode_dquot_ref(inode, type, tofree_head);
- }
- }
- spin_unlock(&inode_sb_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
-}
-
-/* Gather all references from inodes and drop them */
-static void drop_dquot_ref(struct super_block *sb, int type)
-{
- LIST_HEAD(tofree_head);
-
- if (sb->dq_op) {
- down_write(&sb_dqopt(sb)->dqptr_sem);
- remove_dquot_ref(sb, type, &tofree_head);
- up_write(&sb_dqopt(sb)->dqptr_sem);
- put_dquot_list(&tofree_head);
- }
-}
-
-static inline void dquot_incr_inodes(struct dquot *dquot, qsize_t number)
-{
- dquot->dq_dqb.dqb_curinodes += number;
-}
-
-static inline void dquot_incr_space(struct dquot *dquot, qsize_t number)
-{
- dquot->dq_dqb.dqb_curspace += number;
-}
-
-static inline void dquot_resv_space(struct dquot *dquot, qsize_t number)
-{
- dquot->dq_dqb.dqb_rsvspace += number;
-}
-
-/*
- * Claim reserved quota space
- */
-static void dquot_claim_reserved_space(struct dquot *dquot, qsize_t number)
-{
- 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;
-}
-
-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;
- }
-}
-
-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 = (time_t) 0;
- clear_bit(DQ_INODES_B, &dquot->dq_flags);
-}
-
-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 = (time_t) 0;
- clear_bit(DQ_BLKS_B, &dquot->dq_flags);
-}
-
-struct dquot_warn {
- struct super_block *w_sb;
- qid_t w_dq_id;
- short w_dq_type;
- 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);
-}
-
-#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_type) {
- case USRQUOTA:
- return current_fsuid() == warn->w_dq_id;
- case GRPQUOTA:
- return in_group_p(warn->w_dq_id);
- }
- return 0;
-}
-
-/* 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_type]);
- switch (warntype) {
- case QUOTA_NL_IHARDWARN:
- msg = " file limit reached.\r\n";
- break;
- case QUOTA_NL_ISOFTLONGWARN:
- msg = " file quota exceeded too long.\r\n";
- break;
- case QUOTA_NL_ISOFTWARN:
- msg = " file quota exceeded.\r\n";
- break;
- case QUOTA_NL_BHARDWARN:
- msg = " block limit reached.\r\n";
- break;
- case QUOTA_NL_BSOFTLONGWARN:
- msg = " block quota exceeded too long.\r\n";
- break;
- case QUOTA_NL_BSOFTWARN:
- msg = " block quota exceeded.\r\n";
- break;
- }
- tty_write_message(tty, msg);
- tty_kref_put(tty);
-}
-#endif
-
-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;
- warn->w_dq_type = dquot->dq_type;
-}
-
-/*
- * 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_type, warn[i].w_dq_id,
- warn[i].w_sb->s_dev, warn[i].w_type);
- }
-}
-
-static int ignore_hardlimit(struct dquot *dquot)
-{
- struct mem_dqinfo *info = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_type];
-
- return capable(CAP_SYS_RESOURCE) &&
- (info->dqi_format->qf_fmt_id != QFMT_VFS_OLD ||
- !(info->dqi_flags & V1_DQF_RSQUASH));
-}
-
-/* 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_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 &&
- get_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 = get_seconds() +
- sb_dqopt(dquot->dq_sb)->info[dquot->dq_type].dqi_igrace;
- }
-
- return 0;
-}
-
-/* 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_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 &&
- get_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 = get_seconds() +
- sb_dqopt(sb)->info[dquot->dq_type].dqi_bgrace;
- }
- else
- /*
- * We don't allow preallocation to exceed softlimit so exceeding will
- * be always printed
- */
- return -EDQUOT;
- }
-
- return 0;
-}
-
-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_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;
-}
-
-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;
-}
-
-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);
-}
-
-/*
- * Initialize quota pointers in inode
- *
- * We do things in a bit complicated way but by that we avoid calling
- * dqget() and thus filesystem callbacks under dqptr_sem.
- *
- * 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 void __dquot_initialize(struct inode *inode, int type)
-{
- unsigned int id = 0;
- int cnt;
- struct dquot *got[MAXQUOTAS];
- struct super_block *sb = inode->i_sb;
- qsize_t rsv;
-
- /* First test before acquiring mutex - solves deadlocks when we
- * re-enter the quota code and are already holding the mutex */
- if (!dquot_active(inode))
- return;
-
- /* First get references to structures we might need. */
- for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
- got[cnt] = NULL;
- if (type != -1 && cnt != type)
- continue;
- switch (cnt) {
- case USRQUOTA:
- id = inode->i_uid;
- break;
- case GRPQUOTA:
- id = inode->i_gid;
- break;
- }
- got[cnt] = dqget(sb, id, cnt);
- }
-
- down_write(&sb_dqopt(sb)->dqptr_sem);
- if (IS_NOQUOTA(inode))
- goto out_err;
- 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 (!inode->i_dquot[cnt]) {
- inode->i_dquot[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(inode->i_dquot[cnt], rsv);
- }
- }
-out_err:
- up_write(&sb_dqopt(sb)->dqptr_sem);
- /* Drop unused references */
- dqput_all(got);
-}
-
-void dquot_initialize(struct inode *inode)
-{
- __dquot_initialize(inode, -1);
-}
-EXPORT_SYMBOL(dquot_initialize);
-
-/*
- * Release all quotas referenced by inode
- */
-static void __dquot_drop(struct inode *inode)
-{
- int cnt;
- struct dquot *put[MAXQUOTAS];
-
- down_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
- for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
- put[cnt] = inode->i_dquot[cnt];
- inode->i_dquot[cnt] = NULL;
- }
- up_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
- dqput_all(put);
-}
-
-void dquot_drop(struct inode *inode)
-{
- 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.
- */
- for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
- if (inode->i_dquot[cnt])
- break;
- }
-
- if (cnt < MAXQUOTAS)
- __dquot_drop(inode);
-}
-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);
-}
-
-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);
-}
-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);
-}
-EXPORT_SYMBOL(inode_claim_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);
-}
-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;
-}
-
-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);
-}
-
-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);
-}
-
-/*
- * 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;
- struct dquot_warn warn[MAXQUOTAS];
- struct dquot **dquots = inode->i_dquot;
- int reserve = flags & DQUOT_SPACE_RESERVE;
-
- /*
- * First test before acquiring mutex - solves deadlocks when we
- * re-enter the quota code and are already holding the mutex
- */
- if (!dquot_active(inode)) {
- inode_incr_space(inode, number, reserve);
- goto out;
- }
-
- down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
- for (cnt = 0; cnt < MAXQUOTAS; cnt++)
- warn[cnt].w_type = QUOTA_NL_NOWARN;
-
- 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:
- up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
- flush_warnings(warn);
-out:
- return ret;
-}
-EXPORT_SYMBOL(__dquot_alloc_space);
-
-/*
- * This operation can block, but only after everything is updated
- */
-int dquot_alloc_inode(const struct inode *inode)
-{
- int cnt, ret = 0;
- struct dquot_warn warn[MAXQUOTAS];
- struct dquot * const *dquots = inode->i_dquot;
-
- /* First test before acquiring mutex - solves deadlocks when we
- * re-enter the quota code and are already holding the mutex */
- if (!dquot_active(inode))
- return 0;
- for (cnt = 0; cnt < MAXQUOTAS; cnt++)
- warn[cnt].w_type = QUOTA_NL_NOWARN;
- down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
- 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);
- up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
- flush_warnings(warn);
- return ret;
-}
-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)
-{
- int cnt;
-
- if (!dquot_active(inode)) {
- inode_claim_rsv_space(inode, number);
- return 0;
- }
-
- down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
- spin_lock(&dq_data_lock);
- /* Claim reserved quotas to allocated quotas */
- for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
- if (inode->i_dquot[cnt])
- dquot_claim_reserved_space(inode->i_dquot[cnt],
- number);
- }
- /* Update inode bytes */
- inode_claim_rsv_space(inode, number);
- spin_unlock(&dq_data_lock);
- mark_all_dquot_dirty(inode->i_dquot);
- up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
- return 0;
-}
-EXPORT_SYMBOL(dquot_claim_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 = inode->i_dquot;
- int reserve = flags & DQUOT_SPACE_RESERVE;
-
- /* First test before acquiring mutex - solves deadlocks when we
- * re-enter the quota code and are already holding the mutex */
- if (!dquot_active(inode)) {
- inode_decr_space(inode, number, reserve);
- return;
- }
-
- down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
- 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:
- up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
- flush_warnings(warn);
-}
-EXPORT_SYMBOL(__dquot_free_space);
-
-/*
- * This operation can block, but only after everything is updated
- */
-void dquot_free_inode(const struct inode *inode)
-{
- unsigned int cnt;
- struct dquot_warn warn[MAXQUOTAS];
- struct dquot * const *dquots = inode->i_dquot;
-
- /* First test before acquiring mutex - solves deadlocks when we
- * re-enter the quota code and are already holding the mutex */
- if (!dquot_active(inode))
- return;
-
- down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
- 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);
- up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
- flush_warnings(warn);
-}
-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.
- *
- */
-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];
-
- /* First test before acquiring mutex - solves deadlocks when we
- * re-enter the quota code and are already holding the mutex */
- 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;
- }
- down_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
- if (IS_NOQUOTA(inode)) { /* File without quota accounting? */
- up_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
- return 0;
- }
- spin_lock(&dq_data_lock);
- 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] = inode->i_dquot[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);
-
- inode->i_dquot[cnt] = transfer_to[cnt];
- }
- spin_unlock(&dq_data_lock);
- up_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
-
- 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);
- up_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
- flush_warnings(warn_to);
- return ret;
-}
-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 super_block *sb = inode->i_sb;
- int ret;
-
- if (!dquot_active(inode))
- return 0;
-
- if (iattr->ia_valid & ATTR_UID && iattr->ia_uid != inode->i_uid)
- transfer_to[USRQUOTA] = dqget(sb, iattr->ia_uid, USRQUOTA);
- if (iattr->ia_valid & ATTR_GID && iattr->ia_gid != inode->i_gid)
- transfer_to[GRPQUOTA] = dqget(sb, iattr->ia_gid, GRPQUOTA);
-
- ret = __dquot_transfer(inode, transfer_to);
- dqput_all(transfer_to);
- return ret;
-}
-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;
-}
-EXPORT_SYMBOL(dquot_commit_info);
-
-/*
- * 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,
-};
-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;
-}
-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];
-
- /* 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;
-
- /* We need to serialize quota_off() for device */
- mutex_lock(&dqopt->dqonoff_mutex);
-
- /*
- * 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)) {
- mutex_unlock(&dqopt->dqonoff_mutex);
- 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;
- }
- mutex_unlock(&dqopt->dqonoff_mutex);
-
- /* 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++)
- if (toputinode[cnt]) {
- mutex_lock(&dqopt->dqonoff_mutex);
- /* If quota was reenabled in the meantime, we have
- * nothing to do */
- if (!sb_has_quota_loaded(sb, cnt)) {
- mutex_lock_nested(&toputinode[cnt]->i_mutex,
- I_MUTEX_QUOTA);
- toputinode[cnt]->i_flags &= ~(S_IMMUTABLE |
- S_NOATIME | S_NOQUOTA);
- truncate_inode_pages(&toputinode[cnt]->i_data,
- 0);
- mutex_unlock(&toputinode[cnt]->i_mutex);
- mark_inode_dirty_sync(toputinode[cnt]);
- }
- mutex_unlock(&dqopt->dqonoff_mutex);
- }
- 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;
-}
-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);
-}
-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) {
- error = -EINVAL;
- goto out_fmt;
- }
- /* Usage always has to be set... */
- if (!(flags & DQUOT_USAGE_ENABLED)) {
- error = -EINVAL;
- 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);
- }
- mutex_lock(&dqopt->dqonoff_mutex);
- if (sb_has_quota_loaded(sb, type)) {
- error = -EBUSY;
- goto out_lock;
- }
-
- 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. */
- mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
- oldflags = inode->i_flags & (S_NOATIME | S_IMMUTABLE |
- S_NOQUOTA);
- inode->i_flags |= S_NOQUOTA | S_NOATIME | S_IMMUTABLE;
- mutex_unlock(&inode->i_mutex);
- /*
- * 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_lock;
- 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);
- mutex_unlock(&dqopt->dqonoff_mutex);
-
- return 0;
-
-out_file_init:
- dqopt->files[type] = NULL;
- iput(inode);
-out_lock:
- if (oldflags != -1) {
- mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
- /* Set the flags back (in the case of accidental quotaon()
- * on a wrong file we don't want to mess up the flags) */
- inode->i_flags &= ~(S_NOATIME | S_NOQUOTA | S_IMMUTABLE);
- inode->i_flags |= oldflags;
- mutex_unlock(&inode->i_mutex);
- }
- mutex_unlock(&dqopt->dqonoff_mutex);
-out_fmt:
- put_quota_format(fmt);
-
- return error;
-}
-
-/* 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;
-
- for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
- if (type != -1 && cnt != type)
- continue;
-
- mutex_lock(&dqopt->dqonoff_mutex);
- if (!sb_has_quota_suspended(sb, cnt)) {
- mutex_unlock(&dqopt->dqonoff_mutex);
- 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);
- mutex_unlock(&dqopt->dqonoff_mutex);
-
- flags = dquot_generic_flag(flags, cnt);
- ret = vfs_load_quota_inode(inode, cnt,
- dqopt->info[cnt].dqi_fmt_id, flags);
- iput(inode);
- }
-
- return ret;
-}
-EXPORT_SYMBOL(dquot_resume);
-
-int dquot_quota_on(struct super_block *sb, int type, int format_id,
- 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(path->dentry->d_inode, type,
- format_id, DQUOT_USAGE_ENABLED |
- DQUOT_LIMITS_ENABLED);
- return error;
-}
-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)
-{
- int ret = 0;
- struct super_block *sb = inode->i_sb;
- struct quota_info *dqopt = sb_dqopt(sb);
-
- /* Just unsuspend quotas? */
- BUG_ON(flags & DQUOT_SUSPENDED);
-
- if (!flags)
- return 0;
- /* Just updating flags needed? */
- if (sb_has_quota_loaded(sb, type)) {
- mutex_lock(&dqopt->dqonoff_mutex);
- /* Now do a reliable test... */
- if (!sb_has_quota_loaded(sb, type)) {
- mutex_unlock(&dqopt->dqonoff_mutex);
- goto load_quota;
- }
- if (flags & DQUOT_USAGE_ENABLED &&
- sb_has_quota_usage_enabled(sb, type)) {
- ret = -EBUSY;
- goto out_lock;
- }
- if (flags & DQUOT_LIMITS_ENABLED &&
- sb_has_quota_limits_enabled(sb, type)) {
- ret = -EBUSY;
- goto out_lock;
- }
- spin_lock(&dq_state_lock);
- sb_dqopt(sb)->flags |= dquot_state_flag(flags, type);
- spin_unlock(&dq_state_lock);
-out_lock:
- mutex_unlock(&dqopt->dqonoff_mutex);
- return ret;
- }
-
-load_quota:
- return vfs_load_quota_inode(inode, type, format_id, flags);
-}
-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;
-
- mutex_lock(&sb->s_root->d_inode->i_mutex);
- dentry = lookup_one_len(qf_name, sb->s_root, strlen(qf_name));
- mutex_unlock(&sb->s_root->d_inode->i_mutex);
- if (IS_ERR(dentry))
- return PTR_ERR(dentry);
-
- if (!dentry->d_inode) {
- error = -ENOENT;
- goto out;
- }
-
- error = security_quota_on(dentry);
- if (!error)
- error = vfs_load_quota_inode(dentry->d_inode, type, format_id,
- DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
-
-out:
- dput(dentry);
- return error;
-}
-EXPORT_SYMBOL(dquot_quota_on_mount);
-
-static inline qsize_t qbtos(qsize_t blocks)
-{
- return blocks << QIF_DQBLKSIZE_BITS;
-}
-
-static inline qsize_t stoqb(qsize_t space)
-{
- return (space + QIF_DQBLKSIZE - 1) >> QIF_DQBLKSIZE_BITS;
-}
-
-/* Generic routine for getting common part of quota structure */
-static void do_get_dqblk(struct dquot *dquot, struct fs_disk_quota *di)
-{
- struct mem_dqblk *dm = &dquot->dq_dqb;
-
- memset(di, 0, sizeof(*di));
- di->d_version = FS_DQUOT_VERSION;
- di->d_flags = dquot->dq_type == USRQUOTA ?
- FS_USER_QUOTA : FS_GROUP_QUOTA;
- di->d_id = dquot->dq_id;
-
- spin_lock(&dq_data_lock);
- di->d_blk_hardlimit = stoqb(dm->dqb_bhardlimit);
- di->d_blk_softlimit = stoqb(dm->dqb_bsoftlimit);
- di->d_ino_hardlimit = dm->dqb_ihardlimit;
- di->d_ino_softlimit = dm->dqb_isoftlimit;
- di->d_bcount = dm->dqb_curspace + dm->dqb_rsvspace;
- di->d_icount = dm->dqb_curinodes;
- di->d_btimer = dm->dqb_btime;
- di->d_itimer = dm->dqb_itime;
- spin_unlock(&dq_data_lock);
-}
-
-int dquot_get_dqblk(struct super_block *sb, int type, qid_t id,
- struct fs_disk_quota *di)
-{
- struct dquot *dquot;
-
- dquot = dqget(sb, id, type);
- if (!dquot)
- return -ESRCH;
- do_get_dqblk(dquot, di);
- dqput(dquot);
-
- return 0;
-}
-EXPORT_SYMBOL(dquot_get_dqblk);
-
-#define VFS_FS_DQ_MASK \
- (FS_DQ_BCOUNT | FS_DQ_BSOFT | FS_DQ_BHARD | \
- FS_DQ_ICOUNT | FS_DQ_ISOFT | FS_DQ_IHARD | \
- FS_DQ_BTIMER | FS_DQ_ITIMER)
-
-/* Generic routine for setting common part of quota structure */
-static int do_set_dqblk(struct dquot *dquot, struct fs_disk_quota *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_type];
-
- if (di->d_fieldmask & ~VFS_FS_DQ_MASK)
- return -EINVAL;
-
- if (((di->d_fieldmask & FS_DQ_BSOFT) &&
- (di->d_blk_softlimit > dqi->dqi_maxblimit)) ||
- ((di->d_fieldmask & FS_DQ_BHARD) &&
- (di->d_blk_hardlimit > dqi->dqi_maxblimit)) ||
- ((di->d_fieldmask & FS_DQ_ISOFT) &&
- (di->d_ino_softlimit > dqi->dqi_maxilimit)) ||
- ((di->d_fieldmask & FS_DQ_IHARD) &&
- (di->d_ino_hardlimit > dqi->dqi_maxilimit)))
- return -ERANGE;
-
- spin_lock(&dq_data_lock);
- if (di->d_fieldmask & FS_DQ_BCOUNT) {
- dm->dqb_curspace = di->d_bcount - dm->dqb_rsvspace;
- check_blim = 1;
- set_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags);
- }
-
- if (di->d_fieldmask & FS_DQ_BSOFT)
- dm->dqb_bsoftlimit = qbtos(di->d_blk_softlimit);
- if (di->d_fieldmask & FS_DQ_BHARD)
- dm->dqb_bhardlimit = qbtos(di->d_blk_hardlimit);
- if (di->d_fieldmask & (FS_DQ_BSOFT | FS_DQ_BHARD)) {
- check_blim = 1;
- set_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags);
- }
-
- if (di->d_fieldmask & FS_DQ_ICOUNT) {
- dm->dqb_curinodes = di->d_icount;
- check_ilim = 1;
- set_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags);
- }
-
- if (di->d_fieldmask & FS_DQ_ISOFT)
- dm->dqb_isoftlimit = di->d_ino_softlimit;
- if (di->d_fieldmask & FS_DQ_IHARD)
- dm->dqb_ihardlimit = di->d_ino_hardlimit;
- if (di->d_fieldmask & (FS_DQ_ISOFT | FS_DQ_IHARD)) {
- check_ilim = 1;
- set_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags);
- }
-
- if (di->d_fieldmask & FS_DQ_BTIMER) {
- dm->dqb_btime = di->d_btimer;
- check_blim = 1;
- set_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags);
- }
-
- if (di->d_fieldmask & FS_DQ_ITIMER) {
- dm->dqb_itime = di->d_itimer;
- 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 & FS_DQ_BTIMER))
- /* Set grace only if user hasn't provided his own... */
- dm->dqb_btime = get_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 & FS_DQ_ITIMER))
- /* Set grace only if user hasn't provided his own... */
- dm->dqb_itime = get_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;
-}
-
-int dquot_set_dqblk(struct super_block *sb, int type, qid_t id,
- struct fs_disk_quota *di)
-{
- struct dquot *dquot;
- int rc;
-
- dquot = dqget(sb, id, type);
- if (!dquot) {
- rc = -ESRCH;
- goto out;
- }
- rc = do_set_dqblk(dquot, di);
- dqput(dquot);
-out:
- return rc;
-}
-EXPORT_SYMBOL(dquot_set_dqblk);
-
-/* Generic routine for getting common part of quota file information */
-int dquot_get_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii)
-{
- struct mem_dqinfo *mi;
-
- mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
- if (!sb_has_quota_active(sb, type)) {
- mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
- return -ESRCH;
- }
- mi = sb_dqopt(sb)->info + type;
- spin_lock(&dq_data_lock);
- ii->dqi_bgrace = mi->dqi_bgrace;
- ii->dqi_igrace = mi->dqi_igrace;
- ii->dqi_flags = mi->dqi_flags & DQF_GETINFO_MASK;
- ii->dqi_valid = IIF_ALL;
- spin_unlock(&dq_data_lock);
- mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
- return 0;
-}
-EXPORT_SYMBOL(dquot_get_dqinfo);
-
-/* Generic routine for setting common part of quota file information */
-int dquot_set_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii)
-{
- struct mem_dqinfo *mi;
- int err = 0;
-
- mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
- if (!sb_has_quota_active(sb, type)) {
- err = -ESRCH;
- goto out;
- }
- mi = sb_dqopt(sb)->info + type;
- spin_lock(&dq_data_lock);
- if (ii->dqi_valid & IIF_BGRACE)
- mi->dqi_bgrace = ii->dqi_bgrace;
- if (ii->dqi_valid & IIF_IGRACE)
- mi->dqi_igrace = ii->dqi_igrace;
- if (ii->dqi_valid & IIF_FLAGS)
- mi->dqi_flags = (mi->dqi_flags & ~DQF_SETINFO_MASK) |
- (ii->dqi_flags & DQF_SETINFO_MASK);
- spin_unlock(&dq_data_lock);
- mark_info_dirty(sb, type);
- /* Force write to disk */
- sb->dq_op->write_info(sb, type);
-out:
- mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
- return err;
-}
-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_info = dquot_get_dqinfo,
- .set_info = dquot_set_dqinfo,
- .get_dqblk = dquot_get_dqblk,
- .set_dqblk = dquot_set_dqblk
-};
-EXPORT_SYMBOL(dquot_quotactl_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);
-}
-
-static 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 ctl_table fs_table[] = {
- {
- .procname = "quota",
- .mode = 0555,
- .child = fs_dqstats_table,
- },
- { },
-};
-
-static 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);
- 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);
-
- printk("Dquot-cache hash table entries: %ld (order %ld, %ld bytes)\n",
- nr_hash, order, (PAGE_SIZE << order));
-
- register_shrinker(&dqcache_shrinker);
-
- return 0;
-}
-module_init(dquot_init);