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authorJan Kara <jack@suse.cz>2009-01-26 15:28:09 +0100
committerJan Kara <jack@suse.cz>2009-03-26 02:18:35 +0100
commit884d179dff3aa98a73c3ba9dee05fd6050d664f0 (patch)
tree68c18e3ff8decd2af861e807bed96cca2dea30d4 /fs/dquot.c
parent60e58e0f30e723464c2a7d34b71b8675566c572d (diff)
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quota: Move quota files into separate directory
Quota subsystem has more and more files. It's time to create a dir for it. Signed-off-by: Jan Kara <jack@suse.cz>
Diffstat (limited to 'fs/dquot.c')
-rw-r--r--fs/dquot.c2564
1 files changed, 0 insertions, 2564 deletions
diff --git a/fs/dquot.c b/fs/dquot.c
deleted file mode 100644
index 28aa14667602..000000000000
--- a/fs/dquot.c
+++ /dev/null
@@ -1,2564 +0,0 @@
-/*
- * Implementation of the diskquota system for the LINUX operating system. QUOTA
- * is implemented using the BSD system call interface as the means of
- * communication with the user level. This file contains the generic routines
- * called by the different filesystems on allocation of an inode or block.
- * These routines take care of the administration needed to have a consistent
- * diskquota tracking system. The ideas of both user and group quotas are based
- * on the Melbourne quota system as used on BSD derived systems. The internal
- * implementation is based on one of the several variants of the LINUX
- * inode-subsystem with added complexity of the diskquota system.
- *
- * Author: Marco van Wieringen <mvw@planets.elm.net>
- *
- * Fixes: Dmitry Gorodchanin <pgmdsg@ibi.com>, 11 Feb 96
- *
- * Revised list management to avoid races
- * -- Bill Hawes, <whawes@star.net>, 9/98
- *
- * Fixed races in dquot_transfer(), dqget() and dquot_alloc_...().
- * As the consequence the locking was moved from dquot_decr_...(),
- * dquot_incr_...() to calling functions.
- * invalidate_dquots() now writes modified dquots.
- * Serialized quota_off() and quota_on() for mount point.
- * Fixed a few bugs in grow_dquots().
- * Fixed deadlock in write_dquot() - we no longer account quotas on
- * quota files
- * remove_dquot_ref() moved to inode.c - it now traverses through inodes
- * add_dquot_ref() restarts after blocking
- * Added check for bogus uid and fixed check for group in quotactl.
- * Jan Kara, <jack@suse.cz>, sponsored by SuSE CR, 10-11/99
- *
- * Used struct list_head instead of own list struct
- * Invalidation of referenced dquots is no longer possible
- * Improved free_dquots list management
- * Quota and i_blocks are now updated in one place to avoid races
- * Warnings are now delayed so we won't block in critical section
- * Write updated not to require dquot lock
- * Jan Kara, <jack@suse.cz>, 9/2000
- *
- * Added dynamic quota structure allocation
- * Jan Kara <jack@suse.cz> 12/2000
- *
- * Rewritten quota interface. Implemented new quota format and
- * formats registering.
- * Jan Kara, <jack@suse.cz>, 2001,2002
- *
- * New SMP locking.
- * Jan Kara, <jack@suse.cz>, 10/2002
- *
- * Added journalled quota support, fix lock inversion problems
- * Jan Kara, <jack@suse.cz>, 2003,2004
- *
- * (C) Copyright 1994 - 1997 Marco van Wieringen
- */
-
-#include <linux/errno.h>
-#include <linux/kernel.h>
-#include <linux/fs.h>
-#include <linux/mount.h>
-#include <linux/mm.h>
-#include <linux/time.h>
-#include <linux/types.h>
-#include <linux/string.h>
-#include <linux/fcntl.h>
-#include <linux/stat.h>
-#include <linux/tty.h>
-#include <linux/file.h>
-#include <linux/slab.h>
-#include <linux/sysctl.h>
-#include <linux/init.h>
-#include <linux/module.h>
-#include <linux/proc_fs.h>
-#include <linux/security.h>
-#include <linux/kmod.h>
-#include <linux/namei.h>
-#include <linux/buffer_head.h>
-#include <linux/capability.h>
-#include <linux/quotaops.h>
-#include <linux/writeback.h> /* for inode_lock, oddly enough.. */
-#ifdef CONFIG_QUOTA_NETLINK_INTERFACE
-#include <net/netlink.h>
-#include <net/genetlink.h>
-#endif
-
-#include <asm/uaccess.h>
-
-#define __DQUOT_PARANOIA
-
-/*
- * There are three quota SMP locks. dq_list_lock protects all lists with quotas
- * and quota formats, dqstats structure containing statistics about the lists
- * dq_data_lock protects data from dq_dqb and also mem_dqinfo structures and
- * also guards consistency of dquot->dq_dqb with inode->i_blocks, i_bytes.
- * i_blocks and i_bytes updates itself are guarded by i_lock acquired directly
- * in inode_add_bytes() and inode_sub_bytes(). dq_state_lock protects
- * modifications of quota state (on quotaon and quotaoff) and readers who care
- * about latest values take it as well.
- *
- * The spinlock ordering is hence: dq_data_lock > dq_list_lock > i_lock,
- * dq_list_lock > dq_state_lock
- *
- * Note that some things (eg. sb pointer, type, id) doesn't change during
- * the life of the dquot structure and so needn't to be protected by a lock
- *
- * Any operation working on dquots via inode pointers must hold dqptr_sem. If
- * operation is just reading pointers from inode (or not using them at all) the
- * read lock is enough. If pointers are altered function must hold write lock
- * (these locking rules also apply for S_NOQUOTA flag in the inode - note that
- * for altering the flag i_mutex is also needed).
- *
- * Each dquot has its dq_lock mutex. Locked dquots might not be referenced
- * from inodes (dquot_alloc_space() and such don't check the dq_lock).
- * Currently dquot is locked only when it is being read to memory (or space for
- * it is being allocated) on the first dqget() and when it is being released on
- * the last dqput(). The allocation and release oparations are serialized by
- * the dq_lock and by checking the use count in dquot_release(). Write
- * operations on dquots don't hold dq_lock as they copy data under dq_data_lock
- * spinlock to internal buffers before writing.
- *
- * Lock ordering (including related VFS locks) is the following:
- * i_mutex > dqonoff_sem > journal_lock > dqptr_sem > dquot->dq_lock >
- * dqio_mutex
- * The lock ordering of dqptr_sem imposed by quota code is only dqonoff_sem >
- * dqptr_sem. But filesystem has to count with the fact that functions such as
- * dquot_alloc_space() acquire dqptr_sem and they usually have to be called
- * from inside a transaction to keep filesystem consistency after a crash. Also
- * filesystems usually want to do some IO on dquot from ->mark_dirty which is
- * called with dqptr_sem held.
- * i_mutex on quota files is special (it's below dqio_mutex)
- */
-
-static DEFINE_SPINLOCK(dq_list_lock);
-static DEFINE_SPINLOCK(dq_state_lock);
-DEFINE_SPINLOCK(dq_data_lock);
-EXPORT_SYMBOL(dq_data_lock);
-
-static char *quotatypes[] = INITQFNAMES;
-static struct quota_format_type *quota_formats; /* List of registered formats */
-static struct quota_module_name module_names[] = INIT_QUOTA_MODULE_NAMES;
-
-/* SLAB cache for dquot structures */
-static struct kmem_cache *dquot_cachep;
-
-int register_quota_format(struct quota_format_type *fmt)
-{
- spin_lock(&dq_list_lock);
- fmt->qf_next = quota_formats;
- quota_formats = fmt;
- spin_unlock(&dq_list_lock);
- return 0;
-}
-EXPORT_SYMBOL(register_quota_format);
-
-void unregister_quota_format(struct quota_format_type *fmt)
-{
- struct quota_format_type **actqf;
-
- spin_lock(&dq_list_lock);
- for (actqf = &quota_formats; *actqf && *actqf != fmt; actqf = &(*actqf)->qf_next);
- if (*actqf)
- *actqf = (*actqf)->qf_next;
- spin_unlock(&dq_list_lock);
-}
-EXPORT_SYMBOL(unregister_quota_format);
-
-static struct quota_format_type *find_quota_format(int id)
-{
- struct quota_format_type *actqf;
-
- spin_lock(&dq_list_lock);
- for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id; actqf = actqf->qf_next);
- if (!actqf || !try_module_get(actqf->qf_owner)) {
- int qm;
-
- spin_unlock(&dq_list_lock);
-
- for (qm = 0; module_names[qm].qm_fmt_id && module_names[qm].qm_fmt_id != id; qm++);
- if (!module_names[qm].qm_fmt_id || request_module(module_names[qm].qm_mod_name))
- return NULL;
-
- spin_lock(&dq_list_lock);
- for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id; actqf = actqf->qf_next);
- if (actqf && !try_module_get(actqf->qf_owner))
- actqf = NULL;
- }
- spin_unlock(&dq_list_lock);
- return actqf;
-}
-
-static void put_quota_format(struct quota_format_type *fmt)
-{
- module_put(fmt->qf_owner);
-}
-
-/*
- * Dquot List Management:
- * The quota code uses three lists for dquot management: the inuse_list,
- * free_dquots, and dquot_hash[] array. A single dquot structure may be
- * on all three lists, depending on its current state.
- *
- * All dquots are placed to the end of inuse_list when first created, and this
- * list is used for invalidate operation, which must look at every dquot.
- *
- * Unused dquots (dq_count == 0) are added to the free_dquots list when freed,
- * and this list is searched whenever we need an available dquot. Dquots are
- * removed from the list as soon as they are used again, and
- * dqstats.free_dquots gives the number of dquots on the list. When
- * dquot is invalidated it's completely released from memory.
- *
- * Dquots with a specific identity (device, type and id) are placed on
- * one of the dquot_hash[] hash chains. The provides an efficient search
- * mechanism to locate a specific dquot.
- */
-
-static LIST_HEAD(inuse_list);
-static LIST_HEAD(free_dquots);
-static unsigned int dq_hash_bits, dq_hash_mask;
-static struct hlist_head *dquot_hash;
-
-struct dqstats dqstats;
-EXPORT_SYMBOL(dqstats);
-
-static inline unsigned int
-hashfn(const struct super_block *sb, unsigned int id, int type)
-{
- unsigned long tmp;
-
- tmp = (((unsigned long)sb>>L1_CACHE_SHIFT) ^ id) * (MAXQUOTAS - type);
- return (tmp + (tmp >> dq_hash_bits)) & dq_hash_mask;
-}
-
-/*
- * Following list functions expect dq_list_lock to be held
- */
-static inline void insert_dquot_hash(struct dquot *dquot)
-{
- struct hlist_head *head = dquot_hash + hashfn(dquot->dq_sb, dquot->dq_id, dquot->dq_type);
- hlist_add_head(&dquot->dq_hash, head);
-}
-
-static inline void remove_dquot_hash(struct dquot *dquot)
-{
- hlist_del_init(&dquot->dq_hash);
-}
-
-static inline struct dquot *find_dquot(unsigned int hashent, struct super_block *sb, unsigned int id, int type)
-{
- struct hlist_node *node;
- struct dquot *dquot;
-
- hlist_for_each (node, dquot_hash+hashent) {
- dquot = hlist_entry(node, struct dquot, dq_hash);
- if (dquot->dq_sb == sb && dquot->dq_id == id && dquot->dq_type == type)
- return dquot;
- }
- return NODQUOT;
-}
-
-/* Add a dquot to the tail of the free list */
-static inline void put_dquot_last(struct dquot *dquot)
-{
- list_add_tail(&dquot->dq_free, &free_dquots);
- dqstats.free_dquots++;
-}
-
-static inline void remove_free_dquot(struct dquot *dquot)
-{
- if (list_empty(&dquot->dq_free))
- return;
- list_del_init(&dquot->dq_free);
- dqstats.free_dquots--;
-}
-
-static inline void put_inuse(struct dquot *dquot)
-{
- /* We add to the back of inuse list so we don't have to restart
- * when traversing this list and we block */
- list_add_tail(&dquot->dq_inuse, &inuse_list);
- dqstats.allocated_dquots++;
-}
-
-static inline void remove_inuse(struct dquot *dquot)
-{
- dqstats.allocated_dquots--;
- list_del(&dquot->dq_inuse);
-}
-/*
- * End of list functions needing dq_list_lock
- */
-
-static void wait_on_dquot(struct dquot *dquot)
-{
- mutex_lock(&dquot->dq_lock);
- mutex_unlock(&dquot->dq_lock);
-}
-
-static inline int dquot_dirty(struct dquot *dquot)
-{
- return test_bit(DQ_MOD_B, &dquot->dq_flags);
-}
-
-static inline int mark_dquot_dirty(struct dquot *dquot)
-{
- return dquot->dq_sb->dq_op->mark_dirty(dquot);
-}
-
-int dquot_mark_dquot_dirty(struct dquot *dquot)
-{
- spin_lock(&dq_list_lock);
- if (!test_and_set_bit(DQ_MOD_B, &dquot->dq_flags))
- list_add(&dquot->dq_dirty, &sb_dqopt(dquot->dq_sb)->
- info[dquot->dq_type].dqi_dirty_list);
- spin_unlock(&dq_list_lock);
- return 0;
-}
-EXPORT_SYMBOL(dquot_mark_dquot_dirty);
-
-/* This function needs dq_list_lock */
-static inline int clear_dquot_dirty(struct dquot *dquot)
-{
- if (!test_and_clear_bit(DQ_MOD_B, &dquot->dq_flags))
- return 0;
- list_del_init(&dquot->dq_dirty);
- return 1;
-}
-
-void mark_info_dirty(struct super_block *sb, int type)
-{
- set_bit(DQF_INFO_DIRTY_B, &sb_dqopt(sb)->info[type].dqi_flags);
-}
-EXPORT_SYMBOL(mark_info_dirty);
-
-/*
- * Read dquot from disk and alloc space for it
- */
-
-int dquot_acquire(struct dquot *dquot)
-{
- int ret = 0, ret2 = 0;
- struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
-
- mutex_lock(&dquot->dq_lock);
- mutex_lock(&dqopt->dqio_mutex);
- if (!test_bit(DQ_READ_B, &dquot->dq_flags))
- ret = dqopt->ops[dquot->dq_type]->read_dqblk(dquot);
- if (ret < 0)
- goto out_iolock;
- set_bit(DQ_READ_B, &dquot->dq_flags);
- /* Instantiate dquot if needed */
- if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && !dquot->dq_off) {
- ret = dqopt->ops[dquot->dq_type]->commit_dqblk(dquot);
- /* Write the info if needed */
- if (info_dirty(&dqopt->info[dquot->dq_type]))
- ret2 = dqopt->ops[dquot->dq_type]->write_file_info(dquot->dq_sb, dquot->dq_type);
- if (ret < 0)
- goto out_iolock;
- if (ret2 < 0) {
- ret = ret2;
- goto out_iolock;
- }
- }
- set_bit(DQ_ACTIVE_B, &dquot->dq_flags);
-out_iolock:
- mutex_unlock(&dqopt->dqio_mutex);
- mutex_unlock(&dquot->dq_lock);
- return ret;
-}
-EXPORT_SYMBOL(dquot_acquire);
-
-/*
- * Write dquot to disk
- */
-int dquot_commit(struct dquot *dquot)
-{
- int ret = 0, ret2 = 0;
- struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
-
- mutex_lock(&dqopt->dqio_mutex);
- spin_lock(&dq_list_lock);
- if (!clear_dquot_dirty(dquot)) {
- spin_unlock(&dq_list_lock);
- goto out_sem;
- }
- spin_unlock(&dq_list_lock);
- /* Inactive dquot can be only if there was error during read/init
- * => we have better not writing it */
- if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) {
- ret = dqopt->ops[dquot->dq_type]->commit_dqblk(dquot);
- if (info_dirty(&dqopt->info[dquot->dq_type]))
- ret2 = dqopt->ops[dquot->dq_type]->write_file_info(dquot->dq_sb, dquot->dq_type);
- if (ret >= 0)
- ret = ret2;
- }
-out_sem:
- mutex_unlock(&dqopt->dqio_mutex);
- return ret;
-}
-EXPORT_SYMBOL(dquot_commit);
-
-/*
- * Release dquot
- */
-int dquot_release(struct dquot *dquot)
-{
- int ret = 0, ret2 = 0;
- struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
-
- mutex_lock(&dquot->dq_lock);
- /* Check whether we are not racing with some other dqget() */
- if (atomic_read(&dquot->dq_count) > 1)
- goto out_dqlock;
- mutex_lock(&dqopt->dqio_mutex);
- if (dqopt->ops[dquot->dq_type]->release_dqblk) {
- ret = dqopt->ops[dquot->dq_type]->release_dqblk(dquot);
- /* Write the info */
- if (info_dirty(&dqopt->info[dquot->dq_type]))
- ret2 = dqopt->ops[dquot->dq_type]->write_file_info(dquot->dq_sb, dquot->dq_type);
- if (ret >= 0)
- ret = ret2;
- }
- clear_bit(DQ_ACTIVE_B, &dquot->dq_flags);
- mutex_unlock(&dqopt->dqio_mutex);
-out_dqlock:
- mutex_unlock(&dquot->dq_lock);
- return ret;
-}
-EXPORT_SYMBOL(dquot_release);
-
-void dquot_destroy(struct dquot *dquot)
-{
- kmem_cache_free(dquot_cachep, dquot);
-}
-EXPORT_SYMBOL(dquot_destroy);
-
-static inline void do_destroy_dquot(struct dquot *dquot)
-{
- dquot->dq_sb->dq_op->destroy_dquot(dquot);
-}
-
-/* Invalidate all dquots on the list. Note that this function is called after
- * quota is disabled and pointers from inodes removed so there cannot be new
- * quota users. There can still be some users of quotas due to inodes being
- * just deleted or pruned by prune_icache() (those are not attached to any
- * list) or parallel quotactl call. We have to wait for such users.
- */
-static void invalidate_dquots(struct super_block *sb, int type)
-{
- struct dquot *dquot, *tmp;
-
-restart:
- spin_lock(&dq_list_lock);
- list_for_each_entry_safe(dquot, tmp, &inuse_list, dq_inuse) {
- if (dquot->dq_sb != sb)
- continue;
- if (dquot->dq_type != type)
- continue;
- /* Wait for dquot users */
- if (atomic_read(&dquot->dq_count)) {
- DEFINE_WAIT(wait);
-
- atomic_inc(&dquot->dq_count);
- prepare_to_wait(&dquot->dq_wait_unused, &wait,
- TASK_UNINTERRUPTIBLE);
- spin_unlock(&dq_list_lock);
- /* Once dqput() wakes us up, we know it's time to free
- * the dquot.
- * IMPORTANT: we rely on the fact that there is always
- * at most one process waiting for dquot to free.
- * Otherwise dq_count would be > 1 and we would never
- * wake up.
- */
- if (atomic_read(&dquot->dq_count) > 1)
- schedule();
- finish_wait(&dquot->dq_wait_unused, &wait);
- dqput(dquot);
- /* At this moment dquot() need not exist (it could be
- * reclaimed by prune_dqcache(). Hence we must
- * restart. */
- goto restart;
- }
- /*
- * Quota now has no users and it has been written on last
- * dqput()
- */
- remove_dquot_hash(dquot);
- remove_free_dquot(dquot);
- remove_inuse(dquot);
- do_destroy_dquot(dquot);
- }
- spin_unlock(&dq_list_lock);
-}
-
-/* Call callback for every active dquot on given filesystem */
-int dquot_scan_active(struct super_block *sb,
- int (*fn)(struct dquot *dquot, unsigned long priv),
- unsigned long priv)
-{
- struct dquot *dquot, *old_dquot = NULL;
- int ret = 0;
-
- mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
- spin_lock(&dq_list_lock);
- list_for_each_entry(dquot, &inuse_list, dq_inuse) {
- if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags))
- continue;
- if (dquot->dq_sb != sb)
- continue;
- /* Now we have active dquot so we can just increase use count */
- atomic_inc(&dquot->dq_count);
- dqstats.lookups++;
- spin_unlock(&dq_list_lock);
- dqput(old_dquot);
- old_dquot = dquot;
- ret = fn(dquot, priv);
- if (ret < 0)
- goto out;
- spin_lock(&dq_list_lock);
- /* We are safe to continue now because our dquot could not
- * be moved out of the inuse list while we hold the reference */
- }
- spin_unlock(&dq_list_lock);
-out:
- dqput(old_dquot);
- mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
- return ret;
-}
-EXPORT_SYMBOL(dquot_scan_active);
-
-int vfs_quota_sync(struct super_block *sb, int type)
-{
- struct list_head *dirty;
- struct dquot *dquot;
- struct quota_info *dqopt = sb_dqopt(sb);
- int cnt;
-
- mutex_lock(&dqopt->dqonoff_mutex);
- for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
- if (type != -1 && cnt != type)
- continue;
- if (!sb_has_quota_active(sb, cnt))
- continue;
- spin_lock(&dq_list_lock);
- dirty = &dqopt->info[cnt].dqi_dirty_list;
- while (!list_empty(dirty)) {
- dquot = list_first_entry(dirty, struct dquot, dq_dirty);
- /* Dirty and inactive can be only bad dquot... */
- if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) {
- clear_dquot_dirty(dquot);
- continue;
- }
- /* Now we have active dquot from which someone is
- * holding reference so we can safely just increase
- * use count */
- atomic_inc(&dquot->dq_count);
- dqstats.lookups++;
- spin_unlock(&dq_list_lock);
- sb->dq_op->write_dquot(dquot);
- dqput(dquot);
- spin_lock(&dq_list_lock);
- }
- spin_unlock(&dq_list_lock);
- }
-
- for (cnt = 0; cnt < MAXQUOTAS; cnt++)
- if ((cnt == type || type == -1) && sb_has_quota_active(sb, cnt)
- && info_dirty(&dqopt->info[cnt]))
- sb->dq_op->write_info(sb, cnt);
- spin_lock(&dq_list_lock);
- dqstats.syncs++;
- spin_unlock(&dq_list_lock);
- mutex_unlock(&dqopt->dqonoff_mutex);
-
- return 0;
-}
-EXPORT_SYMBOL(vfs_quota_sync);
-
-/* Free unused dquots from cache */
-static void prune_dqcache(int count)
-{
- struct list_head *head;
- struct dquot *dquot;
-
- head = free_dquots.prev;
- while (head != &free_dquots && count) {
- dquot = list_entry(head, struct dquot, dq_free);
- remove_dquot_hash(dquot);
- remove_free_dquot(dquot);
- remove_inuse(dquot);
- do_destroy_dquot(dquot);
- count--;
- head = free_dquots.prev;
- }
-}
-
-/*
- * This is called from kswapd when we think we need some
- * more memory
- */
-
-static int shrink_dqcache_memory(int nr, gfp_t gfp_mask)
-{
- if (nr) {
- spin_lock(&dq_list_lock);
- prune_dqcache(nr);
- spin_unlock(&dq_list_lock);
- }
- return (dqstats.free_dquots / 100) * sysctl_vfs_cache_pressure;
-}
-
-static struct shrinker dqcache_shrinker = {
- .shrink = shrink_dqcache_memory,
- .seeks = DEFAULT_SEEKS,
-};
-
-/*
- * Put reference to dquot
- * NOTE: If you change this function please check whether dqput_blocks() works right...
- */
-void dqput(struct dquot *dquot)
-{
- int ret;
-
- if (!dquot)
- return;
-#ifdef __DQUOT_PARANOIA
- if (!atomic_read(&dquot->dq_count)) {
- printk("VFS: dqput: trying to free free dquot\n");
- printk("VFS: device %s, dquot of %s %d\n",
- dquot->dq_sb->s_id,
- quotatypes[dquot->dq_type],
- dquot->dq_id);
- BUG();
- }
-#endif
-
- spin_lock(&dq_list_lock);
- dqstats.drops++;
- spin_unlock(&dq_list_lock);
-we_slept:
- spin_lock(&dq_list_lock);
- if (atomic_read(&dquot->dq_count) > 1) {
- /* We have more than one user... nothing to do */
- atomic_dec(&dquot->dq_count);
- /* Releasing dquot during quotaoff phase? */
- if (!sb_has_quota_active(dquot->dq_sb, dquot->dq_type) &&
- atomic_read(&dquot->dq_count) == 1)
- wake_up(&dquot->dq_wait_unused);
- spin_unlock(&dq_list_lock);
- return;
- }
- /* Need to release dquot? */
- if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && dquot_dirty(dquot)) {
- spin_unlock(&dq_list_lock);
- /* Commit dquot before releasing */
- ret = dquot->dq_sb->dq_op->write_dquot(dquot);
- if (ret < 0) {
- printk(KERN_ERR "VFS: cannot write quota structure on "
- "device %s (error %d). Quota may get out of "
- "sync!\n", dquot->dq_sb->s_id, ret);
- /*
- * We clear dirty bit anyway, so that we avoid
- * infinite loop here
- */
- spin_lock(&dq_list_lock);
- clear_dquot_dirty(dquot);
- spin_unlock(&dq_list_lock);
- }
- goto we_slept;
- }
- /* Clear flag in case dquot was inactive (something bad happened) */
- clear_dquot_dirty(dquot);
- if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) {
- spin_unlock(&dq_list_lock);
- dquot->dq_sb->dq_op->release_dquot(dquot);
- goto we_slept;
- }
- atomic_dec(&dquot->dq_count);
-#ifdef __DQUOT_PARANOIA
- /* sanity check */
- BUG_ON(!list_empty(&dquot->dq_free));
-#endif
- put_dquot_last(dquot);
- spin_unlock(&dq_list_lock);
-}
-EXPORT_SYMBOL(dqput);
-
-struct dquot *dquot_alloc(struct super_block *sb, int type)
-{
- return kmem_cache_zalloc(dquot_cachep, GFP_NOFS);
-}
-EXPORT_SYMBOL(dquot_alloc);
-
-static struct dquot *get_empty_dquot(struct super_block *sb, int type)
-{
- struct dquot *dquot;
-
- dquot = sb->dq_op->alloc_dquot(sb, type);
- if(!dquot)
- return NODQUOT;
-
- mutex_init(&dquot->dq_lock);
- INIT_LIST_HEAD(&dquot->dq_free);
- INIT_LIST_HEAD(&dquot->dq_inuse);
- INIT_HLIST_NODE(&dquot->dq_hash);
- INIT_LIST_HEAD(&dquot->dq_dirty);
- init_waitqueue_head(&dquot->dq_wait_unused);
- dquot->dq_sb = sb;
- dquot->dq_type = type;
- atomic_set(&dquot->dq_count, 1);
-
- return dquot;
-}
-
-/*
- * Get reference to dquot
- *
- * Locking is slightly tricky here. We are guarded from parallel quotaoff()
- * destroying our dquot by:
- * a) checking for quota flags under dq_list_lock and
- * b) getting a reference to dquot before we release dq_list_lock
- */
-struct dquot *dqget(struct super_block *sb, unsigned int id, int type)
-{
- unsigned int hashent = hashfn(sb, id, type);
- struct dquot *dquot = NODQUOT, *empty = NODQUOT;
-
- if (!sb_has_quota_active(sb, type))
- return NODQUOT;
-we_slept:
- spin_lock(&dq_list_lock);
- spin_lock(&dq_state_lock);
- if (!sb_has_quota_active(sb, type)) {
- spin_unlock(&dq_state_lock);
- spin_unlock(&dq_list_lock);
- goto out;
- }
- spin_unlock(&dq_state_lock);
-
- if ((dquot = find_dquot(hashent, sb, id, type)) == NODQUOT) {
- if (empty == NODQUOT) {
- spin_unlock(&dq_list_lock);
- if ((empty = get_empty_dquot(sb, type)) == NODQUOT)
- schedule(); /* Try to wait for a moment... */
- goto we_slept;
- }
- dquot = empty;
- empty = NODQUOT;
- dquot->dq_id = id;
- /* all dquots go on the inuse_list */
- put_inuse(dquot);
- /* hash it first so it can be found */
- insert_dquot_hash(dquot);
- dqstats.lookups++;
- spin_unlock(&dq_list_lock);
- } else {
- if (!atomic_read(&dquot->dq_count))
- remove_free_dquot(dquot);
- atomic_inc(&dquot->dq_count);
- dqstats.cache_hits++;
- dqstats.lookups++;
- spin_unlock(&dq_list_lock);
- }
- /* Wait for dq_lock - after this we know that either dquot_release() is already
- * finished or it will be canceled due to dq_count > 1 test */
- wait_on_dquot(dquot);
- /* Read the dquot and instantiate it (everything done only if needed) */
- if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && sb->dq_op->acquire_dquot(dquot) < 0) {
- dqput(dquot);
- dquot = NODQUOT;
- goto out;
- }
-#ifdef __DQUOT_PARANOIA
- BUG_ON(!dquot->dq_sb); /* Has somebody invalidated entry under us? */
-#endif
-out:
- if (empty)
- do_destroy_dquot(empty);
-
- return dquot;
-}
-EXPORT_SYMBOL(dqget);
-
-static int dqinit_needed(struct inode *inode, int type)
-{
- int cnt;
-
- if (IS_NOQUOTA(inode))
- return 0;
- if (type != -1)
- return inode->i_dquot[type] == NODQUOT;
- for (cnt = 0; cnt < MAXQUOTAS; cnt++)
- if (inode->i_dquot[cnt] == NODQUOT)
- return 1;
- return 0;
-}
-
-/* This routine is guarded by dqonoff_mutex mutex */
-static void add_dquot_ref(struct super_block *sb, int type)
-{
- struct inode *inode, *old_inode = NULL;
-
- spin_lock(&inode_lock);
- list_for_each_entry(inode, &sb->s_inodes, i_sb_list) {
- if (!atomic_read(&inode->i_writecount))
- continue;
- if (!dqinit_needed(inode, type))
- continue;
- if (inode->i_state & (I_FREEING|I_WILL_FREE))
- continue;
-
- __iget(inode);
- spin_unlock(&inode_lock);
-
- iput(old_inode);
- sb->dq_op->initialize(inode, type);
- /* We hold a reference to 'inode' so it couldn't have been
- * removed from s_inodes list while we dropped the inode_lock.
- * We cannot iput the inode now as we can be holding the last
- * reference and we cannot iput it under inode_lock. So we
- * keep the reference and iput it later. */
- old_inode = inode;
- spin_lock(&inode_lock);
- }
- spin_unlock(&inode_lock);
- iput(old_inode);
-}
-
-/* Return 0 if dqput() won't block (note that 1 doesn't necessarily mean blocking) */
-static inline int dqput_blocks(struct dquot *dquot)
-{
- if (atomic_read(&dquot->dq_count) <= 1)
- return 1;
- return 0;
-}
-
-/* Remove references to dquots from inode - add dquot to list for freeing if needed */
-/* We can't race with anybody because we hold dqptr_sem for writing... */
-static int remove_inode_dquot_ref(struct inode *inode, int type,
- struct list_head *tofree_head)
-{
- struct dquot *dquot = inode->i_dquot[type];
-
- inode->i_dquot[type] = NODQUOT;
- if (dquot != NODQUOT) {
- if (dqput_blocks(dquot)) {
-#ifdef __DQUOT_PARANOIA
- if (atomic_read(&dquot->dq_count) != 1)
- printk(KERN_WARNING "VFS: Adding dquot with dq_count %d to dispose list.\n", atomic_read(&dquot->dq_count));
-#endif
- spin_lock(&dq_list_lock);
- list_add(&dquot->dq_free, tofree_head); /* As dquot must have currently users it can't be on the free list... */
- spin_unlock(&dq_list_lock);
- return 1;
- }
- else
- dqput(dquot); /* We have guaranteed we won't block */
- }
- return 0;
-}
-
-/* Free list of dquots - called from inode.c */
-/* dquots are removed from inodes, no new references can be got so we are the only ones holding reference */
-static void put_dquot_list(struct list_head *tofree_head)
-{
- struct list_head *act_head;
- struct dquot *dquot;
-
- act_head = tofree_head->next;
- /* So now we have dquots on the list... Just free them */
- while (act_head != tofree_head) {
- dquot = list_entry(act_head, struct dquot, dq_free);
- act_head = act_head->next;
- list_del_init(&dquot->dq_free); /* Remove dquot from the list so we won't have problems... */
- dqput(dquot);
- }
-}
-
-static void remove_dquot_ref(struct super_block *sb, int type,
- struct list_head *tofree_head)
-{
- struct inode *inode;
-
- spin_lock(&inode_lock);
- list_for_each_entry(inode, &sb->s_inodes, i_sb_list) {
- if (!IS_NOQUOTA(inode))
- remove_inode_dquot_ref(inode, type, tofree_head);
- }
- spin_unlock(&inode_lock);
-}
-
-/* Gather all references from inodes and drop them */
-static void drop_dquot_ref(struct super_block *sb, int type)
-{
- LIST_HEAD(tofree_head);
-
- if (sb->dq_op) {
- down_write(&sb_dqopt(sb)->dqptr_sem);
- remove_dquot_ref(sb, type, &tofree_head);
- up_write(&sb_dqopt(sb)->dqptr_sem);
- put_dquot_list(&tofree_head);
- }
-}
-
-static inline void dquot_incr_inodes(struct dquot *dquot, qsize_t number)
-{
- dquot->dq_dqb.dqb_curinodes += number;
-}
-
-static inline void dquot_incr_space(struct dquot *dquot, qsize_t number)
-{
- dquot->dq_dqb.dqb_curspace += number;
-}
-
-static inline void dquot_resv_space(struct dquot *dquot, qsize_t number)
-{
- dquot->dq_dqb.dqb_rsvspace += number;
-}
-
-/*
- * Claim reserved quota space
- */
-static void dquot_claim_reserved_space(struct dquot *dquot,
- qsize_t number)
-{
- WARN_ON(dquot->dq_dqb.dqb_rsvspace < number);
- dquot->dq_dqb.dqb_curspace += number;
- dquot->dq_dqb.dqb_rsvspace -= number;
-}
-
-static inline
-void dquot_free_reserved_space(struct dquot *dquot, qsize_t number)
-{
- dquot->dq_dqb.dqb_rsvspace -= number;
-}
-
-static inline void dquot_decr_inodes(struct dquot *dquot, qsize_t number)
-{
- if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE ||
- dquot->dq_dqb.dqb_curinodes >= number)
- dquot->dq_dqb.dqb_curinodes -= number;
- else
- dquot->dq_dqb.dqb_curinodes = 0;
- if (dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit)
- dquot->dq_dqb.dqb_itime = (time_t) 0;
- clear_bit(DQ_INODES_B, &dquot->dq_flags);
-}
-
-static inline void dquot_decr_space(struct dquot *dquot, qsize_t number)
-{
- if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE ||
- dquot->dq_dqb.dqb_curspace >= number)
- dquot->dq_dqb.dqb_curspace -= number;
- else
- dquot->dq_dqb.dqb_curspace = 0;
- if (dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit)
- dquot->dq_dqb.dqb_btime = (time_t) 0;
- clear_bit(DQ_BLKS_B, &dquot->dq_flags);
-}
-
-static int warning_issued(struct dquot *dquot, const int warntype)
-{
- int flag = (warntype == QUOTA_NL_BHARDWARN ||
- warntype == QUOTA_NL_BSOFTLONGWARN) ? DQ_BLKS_B :
- ((warntype == QUOTA_NL_IHARDWARN ||
- warntype == QUOTA_NL_ISOFTLONGWARN) ? DQ_INODES_B : 0);
-
- if (!flag)
- return 0;
- return test_and_set_bit(flag, &dquot->dq_flags);
-}
-
-#ifdef CONFIG_PRINT_QUOTA_WARNING
-static int flag_print_warnings = 1;
-
-static inline int need_print_warning(struct dquot *dquot)
-{
- if (!flag_print_warnings)
- return 0;
-
- switch (dquot->dq_type) {
- case USRQUOTA:
- return current_fsuid() == dquot->dq_id;
- case GRPQUOTA:
- return in_group_p(dquot->dq_id);
- }
- return 0;
-}
-
-/* Print warning to user which exceeded quota */
-static void print_warning(struct dquot *dquot, const int warntype)
-{
- char *msg = NULL;
- struct tty_struct *tty;
-
- if (warntype == QUOTA_NL_IHARDBELOW ||
- warntype == QUOTA_NL_ISOFTBELOW ||
- warntype == QUOTA_NL_BHARDBELOW ||
- warntype == QUOTA_NL_BSOFTBELOW || !need_print_warning(dquot))
- return;
-
- tty = get_current_tty();
- if (!tty)
- return;
- tty_write_message(tty, dquot->dq_sb->s_id);
- if (warntype == QUOTA_NL_ISOFTWARN || warntype == QUOTA_NL_BSOFTWARN)
- tty_write_message(tty, ": warning, ");
- else
- tty_write_message(tty, ": write failed, ");
- tty_write_message(tty, quotatypes[dquot->dq_type]);
- switch (warntype) {
- case QUOTA_NL_IHARDWARN:
- msg = " file limit reached.\r\n";
- break;
- case QUOTA_NL_ISOFTLONGWARN:
- msg = " file quota exceeded too long.\r\n";
- break;
- case QUOTA_NL_ISOFTWARN:
- msg = " file quota exceeded.\r\n";
- break;
- case QUOTA_NL_BHARDWARN:
- msg = " block limit reached.\r\n";
- break;
- case QUOTA_NL_BSOFTLONGWARN:
- msg = " block quota exceeded too long.\r\n";
- break;
- case QUOTA_NL_BSOFTWARN:
- msg = " block quota exceeded.\r\n";
- break;
- }
- tty_write_message(tty, msg);
- tty_kref_put(tty);
-}
-#endif
-
-#ifdef CONFIG_QUOTA_NETLINK_INTERFACE
-
-/* Netlink family structure for quota */
-static struct genl_family quota_genl_family = {
- .id = GENL_ID_GENERATE,
- .hdrsize = 0,
- .name = "VFS_DQUOT",
- .version = 1,
- .maxattr = QUOTA_NL_A_MAX,
-};
-
-/* Send warning to userspace about user which exceeded quota */
-static void send_warning(const struct dquot *dquot, const char warntype)
-{
- static atomic_t seq;
- struct sk_buff *skb;
- void *msg_head;
- int ret;
- int msg_size = 4 * nla_total_size(sizeof(u32)) +
- 2 * nla_total_size(sizeof(u64));
-
- /* We have to allocate using GFP_NOFS as we are called from a
- * filesystem performing write and thus further recursion into
- * the fs to free some data could cause deadlocks. */
- skb = genlmsg_new(msg_size, GFP_NOFS);
- if (!skb) {
- printk(KERN_ERR
- "VFS: Not enough memory to send quota warning.\n");
- return;
- }
- msg_head = genlmsg_put(skb, 0, atomic_add_return(1, &seq),
- &quota_genl_family, 0, QUOTA_NL_C_WARNING);
- if (!msg_head) {
- printk(KERN_ERR
- "VFS: Cannot store netlink header in quota warning.\n");
- goto err_out;
- }
- ret = nla_put_u32(skb, QUOTA_NL_A_QTYPE, dquot->dq_type);
- if (ret)
- goto attr_err_out;
- ret = nla_put_u64(skb, QUOTA_NL_A_EXCESS_ID, dquot->dq_id);
- if (ret)
- goto attr_err_out;
- ret = nla_put_u32(skb, QUOTA_NL_A_WARNING, warntype);
- if (ret)
- goto attr_err_out;
- ret = nla_put_u32(skb, QUOTA_NL_A_DEV_MAJOR,
- MAJOR(dquot->dq_sb->s_dev));
- if (ret)
- goto attr_err_out;
- ret = nla_put_u32(skb, QUOTA_NL_A_DEV_MINOR,
- MINOR(dquot->dq_sb->s_dev));
- if (ret)
- goto attr_err_out;
- ret = nla_put_u64(skb, QUOTA_NL_A_CAUSED_ID, current_uid());
- if (ret)
- goto attr_err_out;
- genlmsg_end(skb, msg_head);
-
- ret = genlmsg_multicast(skb, 0, quota_genl_family.id, GFP_NOFS);
- if (ret < 0 && ret != -ESRCH)
- printk(KERN_ERR
- "VFS: Failed to send notification message: %d\n", ret);
- return;
-attr_err_out:
- printk(KERN_ERR "VFS: Not enough space to compose quota message!\n");
-err_out:
- kfree_skb(skb);
-}
-#endif
-/*
- * Write warnings to the console and send warning messages over netlink.
- *
- * Note that this function can sleep.
- */
-static inline void flush_warnings(struct dquot * const *dquots, char *warntype)
-{
- int i;
-
- for (i = 0; i < MAXQUOTAS; i++)
- if (dquots[i] != NODQUOT && warntype[i] != QUOTA_NL_NOWARN &&
- !warning_issued(dquots[i], warntype[i])) {
-#ifdef CONFIG_PRINT_QUOTA_WARNING
- print_warning(dquots[i], warntype[i]);
-#endif
-#ifdef CONFIG_QUOTA_NETLINK_INTERFACE
- send_warning(dquots[i], warntype[i]);
-#endif
- }
-}
-
-static inline char 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, char *warntype)
-{
- *warntype = QUOTA_NL_NOWARN;
- if (!sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_type) ||
- test_bit(DQ_FAKE_B, &dquot->dq_flags))
- return QUOTA_OK;
-
- if (dquot->dq_dqb.dqb_ihardlimit &&
- (dquot->dq_dqb.dqb_curinodes + inodes) > dquot->dq_dqb.dqb_ihardlimit &&
- !ignore_hardlimit(dquot)) {
- *warntype = QUOTA_NL_IHARDWARN;
- return NO_QUOTA;
- }
-
- if (dquot->dq_dqb.dqb_isoftlimit &&
- (dquot->dq_dqb.dqb_curinodes + inodes) > dquot->dq_dqb.dqb_isoftlimit &&
- dquot->dq_dqb.dqb_itime && get_seconds() >= dquot->dq_dqb.dqb_itime &&
- !ignore_hardlimit(dquot)) {
- *warntype = QUOTA_NL_ISOFTLONGWARN;
- return NO_QUOTA;
- }
-
- if (dquot->dq_dqb.dqb_isoftlimit &&
- (dquot->dq_dqb.dqb_curinodes + inodes) > dquot->dq_dqb.dqb_isoftlimit &&
- dquot->dq_dqb.dqb_itime == 0) {
- *warntype = QUOTA_NL_ISOFTWARN;
- dquot->dq_dqb.dqb_itime = get_seconds() + sb_dqopt(dquot->dq_sb)->info[dquot->dq_type].dqi_igrace;
- }
-
- return QUOTA_OK;
-}
-
-/* needs dq_data_lock */
-static int check_bdq(struct dquot *dquot, qsize_t space, int prealloc, char *warntype)
-{
- qsize_t tspace;
-
- *warntype = QUOTA_NL_NOWARN;
- if (!sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_type) ||
- test_bit(DQ_FAKE_B, &dquot->dq_flags))
- return QUOTA_OK;
-
- 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)
- *warntype = QUOTA_NL_BHARDWARN;
- return NO_QUOTA;
- }
-
- 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)
- *warntype = QUOTA_NL_BSOFTLONGWARN;
- return NO_QUOTA;
- }
-
- if (dquot->dq_dqb.dqb_bsoftlimit &&
- tspace > dquot->dq_dqb.dqb_bsoftlimit &&
- dquot->dq_dqb.dqb_btime == 0) {
- if (!prealloc) {
- *warntype = QUOTA_NL_BSOFTWARN;
- dquot->dq_dqb.dqb_btime = get_seconds() + sb_dqopt(dquot->dq_sb)->info[dquot->dq_type].dqi_bgrace;
- }
- else
- /*
- * We don't allow preallocation to exceed softlimit so exceeding will
- * be always printed
- */
- return NO_QUOTA;
- }
-
- return QUOTA_OK;
-}
-
-static int info_idq_free(struct dquot *dquot, qsize_t inodes)
-{
- 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;
-
- if (dquot->dq_dqb.dqb_curinodes - inodes <= dquot->dq_dqb.dqb_isoftlimit)
- return QUOTA_NL_ISOFTBELOW;
- if (dquot->dq_dqb.dqb_curinodes >= dquot->dq_dqb.dqb_ihardlimit &&
- dquot->dq_dqb.dqb_curinodes - inodes < 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;
-}
-/*
- * 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.
- */
-int dquot_initialize(struct inode *inode, int type)
-{
- unsigned int id = 0;
- int cnt, ret = 0;
- struct dquot *got[MAXQUOTAS] = { NODQUOT, NODQUOT };
- struct super_block *sb = inode->i_sb;
-
- /* 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;
-
- /* First get references to structures we might need. */
- for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
- 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);
- /* Having dqptr_sem we know NOQUOTA flags can't be altered... */
- 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;
- if (inode->i_dquot[cnt] == NODQUOT) {
- inode->i_dquot[cnt] = got[cnt];
- got[cnt] = NODQUOT;
- }
- }
-out_err:
- up_write(&sb_dqopt(sb)->dqptr_sem);
- /* Drop unused references */
- for (cnt = 0; cnt < MAXQUOTAS; cnt++)
- dqput(got[cnt]);
- return ret;
-}
-EXPORT_SYMBOL(dquot_initialize);
-
-/*
- * Release all quotas referenced by inode
- */
-int 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] = NODQUOT;
- }
- up_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
-
- for (cnt = 0; cnt < MAXQUOTAS; cnt++)
- dqput(put[cnt]);
- return 0;
-}
-EXPORT_SYMBOL(dquot_drop);
-
-/* Wrapper to remove references to quota structures from inode */
-void vfs_dq_drop(struct inode *inode)
-{
- /* Here we can get arbitrary inode from clear_inode() so we have
- * to be careful. OTOH we don't need locking as quota operations
- * are allowed to change only at mount time */
- if (!IS_NOQUOTA(inode) && inode->i_sb && inode->i_sb->dq_op
- && inode->i_sb->dq_op->drop) {
- int cnt;
- /* 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] != NODQUOT)
- break;
- if (cnt < MAXQUOTAS)
- inode->i_sb->dq_op->drop(inode);
- }
-}
-EXPORT_SYMBOL(vfs_dq_drop);
-
-/*
- * Following four functions update 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 macros 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 warn, int reserve)
-{
- int cnt, ret = QUOTA_OK;
- char warntype[MAXQUOTAS];
-
- for (cnt = 0; cnt < MAXQUOTAS; cnt++)
- warntype[cnt] = QUOTA_NL_NOWARN;
-
- spin_lock(&dq_data_lock);
- for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
- if (inode->i_dquot[cnt] == NODQUOT)
- continue;
- if (check_bdq(inode->i_dquot[cnt], number, warn, warntype+cnt)
- == NO_QUOTA) {
- ret = NO_QUOTA;
- goto out_unlock;
- }
- }
- for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
- if (inode->i_dquot[cnt] == NODQUOT)
- continue;
- if (reserve)
- dquot_resv_space(inode->i_dquot[cnt], number);
- else
- dquot_incr_space(inode->i_dquot[cnt], number);
- }
- if (!reserve)
- inode_add_bytes(inode, number);
-out_unlock:
- spin_unlock(&dq_data_lock);
- flush_warnings(inode->i_dquot, warntype);
- return ret;
-}
-
-int dquot_alloc_space(struct inode *inode, qsize_t number, int warn)
-{
- int cnt, ret = QUOTA_OK;
-
- /*
- * First test before acquiring mutex - solves deadlocks when we
- * re-enter the quota code and are already holding the mutex
- */
- if (IS_NOQUOTA(inode)) {
- inode_add_bytes(inode, number);
- goto out;
- }
-
- down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
- if (IS_NOQUOTA(inode)) {
- inode_add_bytes(inode, number);
- goto out_unlock;
- }
-
- ret = __dquot_alloc_space(inode, number, warn, 0);
- if (ret == NO_QUOTA)
- goto out_unlock;
-
- /* Dirtify all the dquots - this can block when journalling */
- for (cnt = 0; cnt < MAXQUOTAS; cnt++)
- if (inode->i_dquot[cnt])
- mark_dquot_dirty(inode->i_dquot[cnt]);
-out_unlock:
- up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
-out:
- return ret;
-}
-EXPORT_SYMBOL(dquot_alloc_space);
-
-int dquot_reserve_space(struct inode *inode, qsize_t number, int warn)
-{
- int ret = QUOTA_OK;
-
- if (IS_NOQUOTA(inode))
- goto out;
-
- down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
- if (IS_NOQUOTA(inode))
- goto out_unlock;
-
- ret = __dquot_alloc_space(inode, number, warn, 1);
-out_unlock:
- up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
-out:
- return ret;
-}
-EXPORT_SYMBOL(dquot_reserve_space);
-
-/*
- * This operation can block, but only after everything is updated
- */
-int dquot_alloc_inode(const struct inode *inode, qsize_t number)
-{
- int cnt, ret = NO_QUOTA;
- char warntype[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 QUOTA_OK;
- for (cnt = 0; cnt < MAXQUOTAS; cnt++)
- warntype[cnt] = QUOTA_NL_NOWARN;
- down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
- if (IS_NOQUOTA(inode)) {
- up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
- return QUOTA_OK;
- }
- spin_lock(&dq_data_lock);
- for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
- if (inode->i_dquot[cnt] == NODQUOT)
- continue;
- if (check_idq(inode->i_dquot[cnt], number, warntype+cnt) == NO_QUOTA)
- goto warn_put_all;
- }
-
- for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
- if (inode->i_dquot[cnt] == NODQUOT)
- continue;
- dquot_incr_inodes(inode->i_dquot[cnt], number);
- }
- ret = QUOTA_OK;
-warn_put_all:
- spin_unlock(&dq_data_lock);
- if (ret == QUOTA_OK)
- /* Dirtify all the dquots - this can block when journalling */
- for (cnt = 0; cnt < MAXQUOTAS; cnt++)
- if (inode->i_dquot[cnt])
- mark_dquot_dirty(inode->i_dquot[cnt]);
- flush_warnings(inode->i_dquot, warntype);
- up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
- return ret;
-}
-EXPORT_SYMBOL(dquot_alloc_inode);
-
-int dquot_claim_space(struct inode *inode, qsize_t number)
-{
- int cnt;
- int ret = QUOTA_OK;
-
- if (IS_NOQUOTA(inode)) {
- inode_add_bytes(inode, number);
- goto out;
- }
-
- down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
- if (IS_NOQUOTA(inode)) {
- up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
- inode_add_bytes(inode, number);
- goto out;
- }
-
- spin_lock(&dq_data_lock);
- /* Claim reserved quotas to allocated quotas */
- for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
- if (inode->i_dquot[cnt] != NODQUOT)
- dquot_claim_reserved_space(inode->i_dquot[cnt],
- number);
- }
- /* Update inode bytes */
- inode_add_bytes(inode, number);
- spin_unlock(&dq_data_lock);
- /* Dirtify all the dquots - this can block when journalling */
- for (cnt = 0; cnt < MAXQUOTAS; cnt++)
- if (inode->i_dquot[cnt])
- mark_dquot_dirty(inode->i_dquot[cnt]);
- up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
-out:
- return ret;
-}
-EXPORT_SYMBOL(dquot_claim_space);
-
-/*
- * Release reserved quota space
- */
-void dquot_release_reserved_space(struct inode *inode, qsize_t number)
-{
- int cnt;
-
- if (IS_NOQUOTA(inode))
- goto out;
-
- down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
- if (IS_NOQUOTA(inode))
- goto out_unlock;
-
- spin_lock(&dq_data_lock);
- /* Release reserved dquots */
- for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
- if (inode->i_dquot[cnt] != NODQUOT)
- dquot_free_reserved_space(inode->i_dquot[cnt], number);
- }
- spin_unlock(&dq_data_lock);
-
-out_unlock:
- up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
-out:
- return;
-}
-EXPORT_SYMBOL(dquot_release_reserved_space);
-
-/*
- * This operation can block, but only after everything is updated
- */
-int dquot_free_space(struct inode *inode, qsize_t number)
-{
- unsigned int cnt;
- char warntype[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)) {
-out_sub:
- inode_sub_bytes(inode, number);
- return QUOTA_OK;
- }
-
- down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
- /* Now recheck reliably when holding dqptr_sem */
- if (IS_NOQUOTA(inode)) {
- up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
- goto out_sub;
- }
- spin_lock(&dq_data_lock);
- for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
- if (inode->i_dquot[cnt] == NODQUOT)
- continue;
- warntype[cnt] = info_bdq_free(inode->i_dquot[cnt], number);
- dquot_decr_space(inode->i_dquot[cnt], number);
- }
- inode_sub_bytes(inode, number);
- spin_unlock(&dq_data_lock);
- /* Dirtify all the dquots - this can block when journalling */
- for (cnt = 0; cnt < MAXQUOTAS; cnt++)
- if (inode->i_dquot[cnt])
- mark_dquot_dirty(inode->i_dquot[cnt]);
- flush_warnings(inode->i_dquot, warntype);
- up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
- return QUOTA_OK;
-}
-EXPORT_SYMBOL(dquot_free_space);
-
-/*
- * This operation can block, but only after everything is updated
- */
-int dquot_free_inode(const struct inode *inode, qsize_t number)
-{
- unsigned int cnt;
- char warntype[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 QUOTA_OK;
-
- down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
- /* Now recheck reliably when holding dqptr_sem */
- if (IS_NOQUOTA(inode)) {
- up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
- return QUOTA_OK;
- }
- spin_lock(&dq_data_lock);
- for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
- if (inode->i_dquot[cnt] == NODQUOT)
- continue;
- warntype[cnt] = info_idq_free(inode->i_dquot[cnt], number);
- dquot_decr_inodes(inode->i_dquot[cnt], number);
- }
- spin_unlock(&dq_data_lock);
- /* Dirtify all the dquots - this can block when journalling */
- for (cnt = 0; cnt < MAXQUOTAS; cnt++)
- if (inode->i_dquot[cnt])
- mark_dquot_dirty(inode->i_dquot[cnt]);
- flush_warnings(inode->i_dquot, warntype);
- up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
- return QUOTA_OK;
-}
-EXPORT_SYMBOL(dquot_free_inode);
-
-/*
- * call back function, get reserved quota space from underlying fs
- */
-qsize_t dquot_get_reserved_space(struct inode *inode)
-{
- qsize_t reserved_space = 0;
-
- if (sb_any_quota_active(inode->i_sb) &&
- inode->i_sb->dq_op->get_reserved_space)
- reserved_space = inode->i_sb->dq_op->get_reserved_space(inode);
- return reserved_space;
-}
-
-/*
- * Transfer the number of inode and blocks from one diskquota to an other.
- *
- * 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 iattr *iattr)
-{
- qsize_t space, cur_space;
- qsize_t rsv_space = 0;
- struct dquot *transfer_from[MAXQUOTAS];
- struct dquot *transfer_to[MAXQUOTAS];
- int cnt, ret = QUOTA_OK;
- int chuid = iattr->ia_valid & ATTR_UID && inode->i_uid != iattr->ia_uid,
- chgid = iattr->ia_valid & ATTR_GID && inode->i_gid != iattr->ia_gid;
- char warntype_to[MAXQUOTAS];
- char warntype_from_inodes[MAXQUOTAS], warntype_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 QUOTA_OK;
- /* Initialize the arrays */
- for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
- transfer_from[cnt] = NODQUOT;
- transfer_to[cnt] = NODQUOT;
- warntype_to[cnt] = QUOTA_NL_NOWARN;
- switch (cnt) {
- case USRQUOTA:
- if (!chuid)
- continue;
- transfer_to[cnt] = dqget(inode->i_sb, iattr->ia_uid, cnt);
- break;
- case GRPQUOTA:
- if (!chgid)
- continue;
- transfer_to[cnt] = dqget(inode->i_sb, iattr->ia_gid, cnt);
- break;
- }
- }
-
- down_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
- /* Now recheck reliably when holding dqptr_sem */
- if (IS_NOQUOTA(inode)) { /* File without quota accounting? */
- up_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
- goto put_all;
- }
- spin_lock(&dq_data_lock);
- cur_space = inode_get_bytes(inode);
- rsv_space = dquot_get_reserved_space(inode);
- space = cur_space + rsv_space;
- /* Build the transfer_from list and check the limits */
- for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
- if (transfer_to[cnt] == NODQUOT)
- continue;
- transfer_from[cnt] = inode->i_dquot[cnt];
- if (check_idq(transfer_to[cnt], 1, warntype_to + cnt) ==
- NO_QUOTA || check_bdq(transfer_to[cnt], space, 0,
- warntype_to + cnt) == NO_QUOTA)
- goto over_quota;
- }
-
- /*
- * Finally perform the needed transfer from transfer_from to transfer_to
- */
- for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
- /*
- * Skip changes for same uid or gid or for turned off quota-type.
- */
- if (transfer_to[cnt] == NODQUOT)
- continue;
-
- /* Due to IO error we might not have transfer_from[] structure */
- if (transfer_from[cnt]) {
- warntype_from_inodes[cnt] =
- info_idq_free(transfer_from[cnt], 1);
- warntype_from_space[cnt] =
- info_bdq_free(transfer_from[cnt], space);
- 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);
-
- /* Dirtify all the dquots - this can block when journalling */
- for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
- if (transfer_from[cnt])
- mark_dquot_dirty(transfer_from[cnt]);
- if (transfer_to[cnt]) {
- mark_dquot_dirty(transfer_to[cnt]);
- /* The reference we got is transferred to the inode */
- transfer_to[cnt] = NODQUOT;
- }
- }
-warn_put_all:
- flush_warnings(transfer_to, warntype_to);
- flush_warnings(transfer_from, warntype_from_inodes);
- flush_warnings(transfer_from, warntype_from_space);
-put_all:
- for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
- dqput(transfer_from[cnt]);
- dqput(transfer_to[cnt]);
- }
- return ret;
-over_quota:
- spin_unlock(&dq_data_lock);
- up_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
- /* Clear dquot pointers we don't want to dqput() */
- for (cnt = 0; cnt < MAXQUOTAS; cnt++)
- transfer_from[cnt] = NODQUOT;
- ret = NO_QUOTA;
- goto warn_put_all;
-}
-EXPORT_SYMBOL(dquot_transfer);
-
-/* Wrapper for transferring ownership of an inode */
-int vfs_dq_transfer(struct inode *inode, struct iattr *iattr)
-{
- if (sb_any_quota_active(inode->i_sb) && !IS_NOQUOTA(inode)) {
- vfs_dq_init(inode);
- if (inode->i_sb->dq_op->transfer(inode, iattr) == NO_QUOTA)
- return 1;
- }
- return 0;
-}
-EXPORT_SYMBOL(vfs_dq_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.
- */
-struct dquot_operations dquot_operations = {
- .initialize = dquot_initialize,
- .drop = dquot_drop,
- .alloc_space = dquot_alloc_space,
- .alloc_inode = dquot_alloc_inode,
- .free_space = dquot_free_space,
- .free_inode = dquot_free_inode,
- .transfer = dquot_transfer,
- .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,
-};
-
-/*
- * Turn quota off on a device. type == -1 ==> quotaoff for all types (umount)
- */
-int vfs_quota_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(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(vfs_quota_disable);
-
-int vfs_quota_off(struct super_block *sb, int type, int remount)
-{
- return vfs_quota_disable(sb, type, remount ? DQUOT_SUSPENDED :
- (DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED));
-}
-EXPORT_SYMBOL(vfs_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 the inode so
- * that we see all the changes from userspace... */
- write_inode_now(inode, 1);
- /* And now flush the block cache so that kernel sees the
- * changes */
- invalidate_bdev(sb->s_bdev);
- }
- mutex_lock(&inode->i_mutex);
- 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. */
- down_write(&dqopt->dqptr_sem);
- oldflags = inode->i_flags & (S_NOATIME | S_IMMUTABLE | S_NOQUOTA);
- inode->i_flags |= S_NOQUOTA | S_NOATIME | S_IMMUTABLE;
- up_write(&dqopt->dqptr_sem);
- sb->dq_op->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);
- if ((error = dqopt->ops[type]->read_file_info(sb, type)) < 0) {
- mutex_unlock(&dqopt->dqio_mutex);
- goto out_file_init;
- }
- mutex_unlock(&dqopt->dqio_mutex);
- mutex_unlock(&inode->i_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:
- mutex_unlock(&dqopt->dqonoff_mutex);
- if (oldflags != -1) {
- down_write(&dqopt->dqptr_sem);
- /* 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;
- up_write(&dqopt->dqptr_sem);
- }
- mutex_unlock(&inode->i_mutex);
-out_fmt:
- put_quota_format(fmt);
-
- return error;
-}
-
-/* Reenable quotas on remount RW */
-static int vfs_quota_on_remount(struct super_block *sb, int type)
-{
- struct quota_info *dqopt = sb_dqopt(sb);
- struct inode *inode;
- int ret;
- unsigned int flags;
-
- mutex_lock(&dqopt->dqonoff_mutex);
- if (!sb_has_quota_suspended(sb, type)) {
- mutex_unlock(&dqopt->dqonoff_mutex);
- return 0;
- }
- inode = dqopt->files[type];
- dqopt->files[type] = NULL;
- spin_lock(&dq_state_lock);
- flags = dqopt->flags & dquot_state_flag(DQUOT_USAGE_ENABLED |
- DQUOT_LIMITS_ENABLED, type);
- dqopt->flags &= ~dquot_state_flag(DQUOT_STATE_FLAGS, type);
- spin_unlock(&dq_state_lock);
- mutex_unlock(&dqopt->dqonoff_mutex);
-
- flags = dquot_generic_flag(flags, type);
- ret = vfs_load_quota_inode(inode, type, dqopt->info[type].dqi_fmt_id,
- flags);
- iput(inode);
-
- return ret;
-}
-
-int vfs_quota_on_path(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->mnt->mnt_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(vfs_quota_on_path);
-
-int vfs_quota_on(struct super_block *sb, int type, int format_id, char *name,
- int remount)
-{
- struct path path;
- int error;
-
- if (remount)
- return vfs_quota_on_remount(sb, type);
-
- error = kern_path(name, LOOKUP_FOLLOW, &path);
- if (!error) {
- error = vfs_quota_on_path(sb, type, format_id, &path);
- path_put(&path);
- }
- return error;
-}
-EXPORT_SYMBOL(vfs_quota_on);
-
-/*
- * More powerful function for turning on quotas allowing setting
- * of individual quota flags
- */
-int vfs_quota_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? */
- if (flags & DQUOT_SUSPENDED)
- return vfs_quota_on_remount(sb, type);
- 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(vfs_quota_enable);
-
-/*
- * This function is used when filesystem needs to initialize quotas
- * during mount time.
- */
-int vfs_quota_on_mount(struct super_block *sb, char *qf_name,
- int format_id, int type)
-{
- struct dentry *dentry;
- int error;
-
- dentry = lookup_one_len(qf_name, sb->s_root, strlen(qf_name));
- 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(vfs_quota_on_mount);
-
-/* Wrapper to turn on quotas when remounting rw */
-int vfs_dq_quota_on_remount(struct super_block *sb)
-{
- int cnt;
- int ret = 0, err;
-
- if (!sb->s_qcop || !sb->s_qcop->quota_on)
- return -ENOSYS;
- for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
- err = sb->s_qcop->quota_on(sb, cnt, 0, NULL, 1);
- if (err < 0 && !ret)
- ret = err;
- }
- return ret;
-}
-EXPORT_SYMBOL(vfs_dq_quota_on_remount);
-
-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 if_dqblk *di)
-{
- struct mem_dqblk *dm = &dquot->dq_dqb;
-
- spin_lock(&dq_data_lock);
- di->dqb_bhardlimit = stoqb(dm->dqb_bhardlimit);
- di->dqb_bsoftlimit = stoqb(dm->dqb_bsoftlimit);
- di->dqb_curspace = dm->dqb_curspace + dm->dqb_rsvspace;
- di->dqb_ihardlimit = dm->dqb_ihardlimit;
- di->dqb_isoftlimit = dm->dqb_isoftlimit;
- di->dqb_curinodes = dm->dqb_curinodes;
- di->dqb_btime = dm->dqb_btime;
- di->dqb_itime = dm->dqb_itime;
- di->dqb_valid = QIF_ALL;
- spin_unlock(&dq_data_lock);
-}
-
-int vfs_get_dqblk(struct super_block *sb, int type, qid_t id, struct if_dqblk *di)
-{
- struct dquot *dquot;
-
- dquot = dqget(sb, id, type);
- if (dquot == NODQUOT)
- return -ESRCH;
- do_get_dqblk(dquot, di);
- dqput(dquot);
-
- return 0;
-}
-EXPORT_SYMBOL(vfs_get_dqblk);
-
-/* Generic routine for setting common part of quota structure */
-static int do_set_dqblk(struct dquot *dquot, struct if_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_type];
-
- if ((di->dqb_valid & QIF_BLIMITS &&
- (di->dqb_bhardlimit > dqi->dqi_maxblimit ||
- di->dqb_bsoftlimit > dqi->dqi_maxblimit)) ||
- (di->dqb_valid & QIF_ILIMITS &&
- (di->dqb_ihardlimit > dqi->dqi_maxilimit ||
- di->dqb_isoftlimit > dqi->dqi_maxilimit)))
- return -ERANGE;
-
- spin_lock(&dq_data_lock);
- if (di->dqb_valid & QIF_SPACE) {
- dm->dqb_curspace = di->dqb_curspace - dm->dqb_rsvspace;
- check_blim = 1;
- __set_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags);
- }
- if (di->dqb_valid & QIF_BLIMITS) {
- dm->dqb_bsoftlimit = qbtos(di->dqb_bsoftlimit);
- dm->dqb_bhardlimit = qbtos(di->dqb_bhardlimit);
- check_blim = 1;
- __set_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags);
- }
- if (di->dqb_valid & QIF_INODES) {
- dm->dqb_curinodes = di->dqb_curinodes;
- check_ilim = 1;
- __set_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags);
- }
- if (di->dqb_valid & QIF_ILIMITS) {
- dm->dqb_isoftlimit = di->dqb_isoftlimit;
- dm->dqb_ihardlimit = di->dqb_ihardlimit;
- check_ilim = 1;
- __set_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags);
- }
- if (di->dqb_valid & QIF_BTIME) {
- dm->dqb_btime = di->dqb_btime;
- check_blim = 1;
- __set_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags);
- }
- if (di->dqb_valid & QIF_ITIME) {
- dm->dqb_itime = di->dqb_itime;
- 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->dqb_valid & QIF_BTIME)) /* 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->dqb_valid & QIF_ITIME)) /* 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 vfs_set_dqblk(struct super_block *sb, int type, qid_t id, struct if_dqblk *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(vfs_set_dqblk);
-
-/* Generic routine for getting common part of quota file information */
-int vfs_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_MASK;
- ii->dqi_valid = IIF_ALL;
- spin_unlock(&dq_data_lock);
- mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
- return 0;
-}
-EXPORT_SYMBOL(vfs_get_dqinfo);
-
-/* Generic routine for setting common part of quota file information */
-int vfs_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_MASK) | (ii->dqi_flags & DQF_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(vfs_set_dqinfo);
-
-struct quotactl_ops vfs_quotactl_ops = {
- .quota_on = vfs_quota_on,
- .quota_off = vfs_quota_off,
- .quota_sync = vfs_quota_sync,
- .get_info = vfs_get_dqinfo,
- .set_info = vfs_set_dqinfo,
- .get_dqblk = vfs_get_dqblk,
- .set_dqblk = vfs_set_dqblk
-};
-
-static ctl_table fs_dqstats_table[] = {
- {
- .ctl_name = FS_DQ_LOOKUPS,
- .procname = "lookups",
- .data = &dqstats.lookups,
- .maxlen = sizeof(int),
- .mode = 0444,
- .proc_handler = &proc_dointvec,
- },
- {
- .ctl_name = FS_DQ_DROPS,
- .procname = "drops",
- .data = &dqstats.drops,
- .maxlen = sizeof(int),
- .mode = 0444,
- .proc_handler = &proc_dointvec,
- },
- {
- .ctl_name = FS_DQ_READS,
- .procname = "reads",
- .data = &dqstats.reads,
- .maxlen = sizeof(int),
- .mode = 0444,
- .proc_handler = &proc_dointvec,
- },
- {
- .ctl_name = FS_DQ_WRITES,
- .procname = "writes",
- .data = &dqstats.writes,
- .maxlen = sizeof(int),
- .mode = 0444,
- .proc_handler = &proc_dointvec,
- },
- {
- .ctl_name = FS_DQ_CACHE_HITS,
- .procname = "cache_hits",
- .data = &dqstats.cache_hits,
- .maxlen = sizeof(int),
- .mode = 0444,
- .proc_handler = &proc_dointvec,
- },
- {
- .ctl_name = FS_DQ_ALLOCATED,
- .procname = "allocated_dquots",
- .data = &dqstats.allocated_dquots,
- .maxlen = sizeof(int),
- .mode = 0444,
- .proc_handler = &proc_dointvec,
- },
- {
- .ctl_name = FS_DQ_FREE,
- .procname = "free_dquots",
- .data = &dqstats.free_dquots,
- .maxlen = sizeof(int),
- .mode = 0444,
- .proc_handler = &proc_dointvec,
- },
- {
- .ctl_name = FS_DQ_SYNCS,
- .procname = "syncs",
- .data = &dqstats.syncs,
- .maxlen = sizeof(int),
- .mode = 0444,
- .proc_handler = &proc_dointvec,
- },
-#ifdef CONFIG_PRINT_QUOTA_WARNING
- {
- .ctl_name = FS_DQ_WARNINGS,
- .procname = "warnings",
- .data = &flag_print_warnings,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = &proc_dointvec,
- },
-#endif
- { .ctl_name = 0 },
-};
-
-static ctl_table fs_table[] = {
- {
- .ctl_name = FS_DQSTATS,
- .procname = "quota",
- .mode = 0555,
- .child = fs_dqstats_table,
- },
- { .ctl_name = 0 },
-};
-
-static ctl_table sys_table[] = {
- {
- .ctl_name = CTL_FS,
- .procname = "fs",
- .mode = 0555,
- .child = fs_table,
- },
- { .ctl_name = 0 },
-};
-
-static int __init dquot_init(void)
-{
- int i;
- 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");
-
- /* 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);
-
-#ifdef CONFIG_QUOTA_NETLINK_INTERFACE
- if (genl_register_family(&quota_genl_family) != 0)
- printk(KERN_ERR "VFS: Failed to create quota netlink interface.\n");
-#endif
-
- return 0;
-}
-module_init(dquot_init);