| /* |
| * 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. |
| * |
| * Version: $Id: dquot.c,v 6.3 1996/11/17 18:35:34 mvw Exp mvw $ |
| * |
| * 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 two quota SMP locks. dq_list_lock protects all lists with quotas |
| * and quota formats and also 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(). |
| * |
| * The spinlock ordering is hence: dq_data_lock > dq_list_lock > i_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). If operation is holding |
| * reference to dquot in other way (e.g. quotactl ops) it must be guarded by |
| * dqonoff_mutex. |
| * This locking assures that: |
| * a) update/access to dquot pointers in inode is serialized |
| * b) everyone is guarded against invalidate_dquots() |
| * |
| * 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 |
| * i_mutex on quota files is special (it's below dqio_mutex) |
| */ |
| |
| static DEFINE_SPINLOCK(dq_list_lock); |
| DEFINE_SPINLOCK(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; |
| } |
| |
| void unregister_quota_format(struct quota_format_type *fmt) |
| { |
| struct quota_format_type **actqf; |
| |
| spin_lock(&dq_list_lock); |
| for (actqf = "a_formats; *actqf && *actqf != fmt; actqf = &(*actqf)->qf_next); |
| if (*actqf) |
| *actqf = (*actqf)->qf_next; |
| spin_unlock(&dq_list_lock); |
| } |
| |
| 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; |
| |
| static void dqput(struct dquot *dquot); |
| |
| 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; |
| } |
| |
| /* 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; |
| } |
| |
| /* |
| * 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; |
| } |
| |
| /* |
| * 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; |
| } |
| |
| /* 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). 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); |
| kmem_cache_free(dquot_cachep, dquot); |
| } |
| spin_unlock(&dq_list_lock); |
| } |
| |
| 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_enabled(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_enabled(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; |
| } |
| |
| /* 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); |
| kmem_cache_free(dquot_cachep, 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... |
| * MUST be called with either dqptr_sem or dqonoff_mutex held |
| */ |
| static void dqput(struct dquot *dquot) |
| { |
| 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_enabled(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 */ |
| dquot->dq_sb->dq_op->write_dquot(dquot); |
| 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); |
| } |
| |
| static struct dquot *get_empty_dquot(struct super_block *sb, int type) |
| { |
| struct dquot *dquot; |
| |
| dquot = kmem_cache_zalloc(dquot_cachep, GFP_NOFS); |
| 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 |
| * MUST be called with either dqptr_sem or dqonoff_mutex held |
| */ |
| static struct dquot *dqget(struct super_block *sb, unsigned int id, int type) |
| { |
| unsigned int hashent = hashfn(sb, id, type); |
| struct dquot *dquot, *empty = NODQUOT; |
| |
| if (!sb_has_quota_enabled(sb, type)) |
| return NODQUOT; |
| we_slept: |
| spin_lock(&dq_list_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; |
| 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); |
| if (empty) |
| kmem_cache_free(dquot_cachep, empty); |
| } |
| /* 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); |
| return NODQUOT; |
| } |
| #ifdef __DQUOT_PARANOIA |
| BUG_ON(!dquot->dq_sb); /* Has somebody invalidated entry under us? */ |
| #endif |
| |
| return dquot; |
| } |
| |
| 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, unsigned long 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_decr_inodes(struct dquot *dquot, unsigned long number) |
| { |
| if (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 (dquot->dq_dqb.dqb_curspace > number) |
| dquot->dq_dqb.dqb_curspace -= number; |
| else |
| dquot->dq_dqb.dqb_curspace = 0; |
| if (toqb(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 (!need_print_warning(dquot)) |
| return; |
| |
| mutex_lock(&tty_mutex); |
| tty = get_current_tty(); |
| if (!tty) |
| goto out_lock; |
| 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); |
| out_lock: |
| mutex_unlock(&tty_mutex); |
| } |
| #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), |
| "a_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->user->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 |
| |
| 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, ulong inodes, char *warntype) |
| { |
| *warntype = QUOTA_NL_NOWARN; |
| if (inodes <= 0 || 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) |
| { |
| *warntype = QUOTA_NL_NOWARN; |
| if (space <= 0 || test_bit(DQ_FAKE_B, &dquot->dq_flags)) |
| return QUOTA_OK; |
| |
| if (dquot->dq_dqb.dqb_bhardlimit && |
| toqb(dquot->dq_dqb.dqb_curspace + space) > dquot->dq_dqb.dqb_bhardlimit && |
| !ignore_hardlimit(dquot)) { |
| if (!prealloc) |
| *warntype = QUOTA_NL_BHARDWARN; |
| return NO_QUOTA; |
| } |
| |
| if (dquot->dq_dqb.dqb_bsoftlimit && |
| toqb(dquot->dq_dqb.dqb_curspace + space) > 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 && |
| toqb(dquot->dq_dqb.dqb_curspace + space) > 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; |
| } |
| |
| /* |
| * Initialize quota pointers in inode |
| * Transaction must be started at entry |
| */ |
| int dquot_initialize(struct inode *inode, int type) |
| { |
| unsigned int id = 0; |
| int cnt, ret = 0; |
| |
| /* 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; |
| down_write(&sb_dqopt(inode->i_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; |
| if (inode->i_dquot[cnt] == NODQUOT) { |
| switch (cnt) { |
| case USRQUOTA: |
| id = inode->i_uid; |
| break; |
| case GRPQUOTA: |
| id = inode->i_gid; |
| break; |
| } |
| inode->i_dquot[cnt] = dqget(inode->i_sb, id, cnt); |
| } |
| } |
| out_err: |
| up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); |
| return ret; |
| } |
| |
| /* |
| * Release all quotas referenced by inode |
| * Transaction must be started at an entry |
| */ |
| int dquot_drop(struct inode *inode) |
| { |
| int cnt; |
| |
| down_write(&sb_dqopt(inode->i_sb)->dqptr_sem); |
| for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
| if (inode->i_dquot[cnt] != NODQUOT) { |
| dqput(inode->i_dquot[cnt]); |
| inode->i_dquot[cnt] = NODQUOT; |
| } |
| } |
| up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); |
| return 0; |
| } |
| |
| /* |
| * 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 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)) { |
| out_add: |
| inode_add_bytes(inode, number); |
| 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)) { /* Now we can do reliable test... */ |
| up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); |
| goto out_add; |
| } |
| 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) |
| goto warn_put_all; |
| } |
| for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
| if (inode->i_dquot[cnt] == NODQUOT) |
| continue; |
| dquot_incr_space(inode->i_dquot[cnt], number); |
| } |
| inode_add_bytes(inode, 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; |
| } |
| |
| /* |
| * This operation can block, but only after everything is updated |
| */ |
| int dquot_alloc_inode(const struct inode *inode, unsigned long 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; |
| } |
| |
| /* |
| * This operation can block, but only after everything is updated |
| */ |
| int dquot_free_space(struct inode *inode, qsize_t number) |
| { |
| unsigned int cnt; |
| |
| /* 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; |
| 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]); |
| up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); |
| return QUOTA_OK; |
| } |
| |
| /* |
| * This operation can block, but only after everything is updated |
| */ |
| int dquot_free_inode(const struct inode *inode, unsigned long number) |
| { |
| unsigned int cnt; |
| |
| /* 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; |
| 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]); |
| up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); |
| return QUOTA_OK; |
| } |
| |
| /* |
| * 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; |
| struct dquot *transfer_from[MAXQUOTAS]; |
| struct dquot *transfer_to[MAXQUOTAS]; |
| int cnt, ret = NO_QUOTA, 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[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; |
| /* Clear the arrays */ |
| for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
| transfer_to[cnt] = transfer_from[cnt] = NODQUOT; |
| warntype[cnt] = QUOTA_NL_NOWARN; |
| } |
| 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); |
| return QUOTA_OK; |
| } |
| /* First build the transfer_to list - here we can block on |
| * reading/instantiating of dquots. We know that the transaction for |
| * us was already started so we don't violate lock ranking here */ |
| for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
| 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; |
| } |
| } |
| spin_lock(&dq_data_lock); |
| space = inode_get_bytes(inode); |
| /* 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+cnt) == NO_QUOTA || |
| check_bdq(transfer_to[cnt], space, 0, warntype+cnt) == NO_QUOTA) |
| goto warn_put_all; |
| } |
| |
| /* |
| * 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]) { |
| dquot_decr_inodes(transfer_from[cnt], 1); |
| dquot_decr_space(transfer_from[cnt], space); |
| } |
| |
| dquot_incr_inodes(transfer_to[cnt], 1); |
| dquot_incr_space(transfer_to[cnt], space); |
| |
| inode->i_dquot[cnt] = transfer_to[cnt]; |
| } |
| ret = QUOTA_OK; |
| warn_put_all: |
| spin_unlock(&dq_data_lock); |
| /* 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]); |
| } |
| flush_warnings(transfer_to, warntype); |
| |
| for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
| if (ret == QUOTA_OK && transfer_from[cnt] != NODQUOT) |
| dqput(transfer_from[cnt]); |
| if (ret == NO_QUOTA && transfer_to[cnt] != NODQUOT) |
| dqput(transfer_to[cnt]); |
| } |
| up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); |
| return ret; |
| } |
| |
| /* |
| * 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; |
| } |
| |
| /* |
| * 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 |
| }; |
| |
| static inline void set_enable_flags(struct quota_info *dqopt, int type) |
| { |
| switch (type) { |
| case USRQUOTA: |
| dqopt->flags |= DQUOT_USR_ENABLED; |
| break; |
| case GRPQUOTA: |
| dqopt->flags |= DQUOT_GRP_ENABLED; |
| break; |
| } |
| } |
| |
| static inline void reset_enable_flags(struct quota_info *dqopt, int type) |
| { |
| switch (type) { |
| case USRQUOTA: |
| dqopt->flags &= ~DQUOT_USR_ENABLED; |
| break; |
| case GRPQUOTA: |
| dqopt->flags &= ~DQUOT_GRP_ENABLED; |
| break; |
| } |
| } |
| |
| /* |
| * Turn quota off on a device. type == -1 ==> quotaoff for all types (umount) |
| */ |
| int vfs_quota_off(struct super_block *sb, int type) |
| { |
| int cnt; |
| struct quota_info *dqopt = sb_dqopt(sb); |
| struct inode *toputinode[MAXQUOTAS]; |
| |
| /* We need to serialize quota_off() for device */ |
| mutex_lock(&dqopt->dqonoff_mutex); |
| for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
| toputinode[cnt] = NULL; |
| if (type != -1 && cnt != type) |
| continue; |
| if (!sb_has_quota_enabled(sb, cnt)) |
| continue; |
| reset_enable_flags(dqopt, cnt); |
| |
| /* 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]; |
| 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); |
| /* 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_enabled(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]); |
| } |
| iput(toputinode[cnt]); |
| mutex_unlock(&dqopt->dqonoff_mutex); |
| } |
| if (sb->s_bdev) |
| invalidate_bdev(sb->s_bdev); |
| return 0; |
| } |
| |
| /* |
| * Turn quotas on on a device |
| */ |
| |
| /* Helper function when we already have the inode */ |
| static int vfs_quota_on_inode(struct inode *inode, int type, int format_id) |
| { |
| 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; |
| } |
| |
| /* 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_enabled(sb, type)) { |
| error = -EBUSY; |
| goto out_lock; |
| } |
| /* 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; |
| 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); |
| set_enable_flags(dqopt, type); |
| |
| 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; |
| } |
| |
| /* Actual function called from quotactl() */ |
| int vfs_quota_on(struct super_block *sb, int type, int format_id, char *path) |
| { |
| struct nameidata nd; |
| int error; |
| |
| error = path_lookup(path, LOOKUP_FOLLOW, &nd); |
| if (error < 0) |
| return error; |
| error = security_quota_on(nd.path.dentry); |
| if (error) |
| goto out_path; |
| /* Quota file not on the same filesystem? */ |
| if (nd.path.mnt->mnt_sb != sb) |
| error = -EXDEV; |
| else |
| error = vfs_quota_on_inode(nd.path.dentry->d_inode, type, |
| format_id); |
| out_path: |
| path_put(&nd.path); |
| return error; |
| } |
| |
| /* |
| * 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_quota_on_inode(dentry->d_inode, type, format_id); |
| |
| out: |
| dput(dentry); |
| return error; |
| } |
| |
| /* 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 = dm->dqb_bhardlimit; |
| di->dqb_bsoftlimit = dm->dqb_bsoftlimit; |
| di->dqb_curspace = dm->dqb_curspace; |
| 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; |
| |
| mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); |
| if (!(dquot = dqget(sb, id, type))) { |
| mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); |
| return -ESRCH; |
| } |
| do_get_dqblk(dquot, di); |
| dqput(dquot); |
| mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); |
| return 0; |
| } |
| |
| /* 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; |
| check_blim = 1; |
| } |
| if (di->dqb_valid & QIF_BLIMITS) { |
| dm->dqb_bsoftlimit = di->dqb_bsoftlimit; |
| dm->dqb_bhardlimit = di->dqb_bhardlimit; |
| check_blim = 1; |
| } |
| if (di->dqb_valid & QIF_INODES) { |
| dm->dqb_curinodes = di->dqb_curinodes; |
| check_ilim = 1; |
| } |
| if (di->dqb_valid & QIF_ILIMITS) { |
| dm->dqb_isoftlimit = di->dqb_isoftlimit; |
| dm->dqb_ihardlimit = di->dqb_ihardlimit; |
| check_ilim = 1; |
| } |
| if (di->dqb_valid & QIF_BTIME) |
| dm->dqb_btime = di->dqb_btime; |
| if (di->dqb_valid & QIF_ITIME) |
| dm->dqb_itime = di->dqb_itime; |
| |
| if (check_blim) { |
| if (!dm->dqb_bsoftlimit || toqb(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; |
| |
| mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); |
| if (!(dquot = dqget(sb, id, type))) { |
| mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); |
| return -ESRCH; |
| } |
| rc = do_set_dqblk(dquot, di); |
| dqput(dquot); |
| mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); |
| return rc; |
| } |
| |
| /* 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_enabled(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; |
| } |
| |
| /* 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; |
| |
| mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); |
| if (!sb_has_quota_enabled(sb, type)) { |
| mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); |
| return -ESRCH; |
| } |
| 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); |
| mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); |
| return 0; |
| } |
| |
| 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("a_genl_family) != 0) |
| printk(KERN_ERR "VFS: Failed to create quota netlink interface.\n"); |
| #endif |
| |
| return 0; |
| } |
| module_init(dquot_init); |
| |
| EXPORT_SYMBOL(register_quota_format); |
| EXPORT_SYMBOL(unregister_quota_format); |
| EXPORT_SYMBOL(dqstats); |
| EXPORT_SYMBOL(dq_data_lock); |
| EXPORT_SYMBOL(vfs_quota_on); |
| EXPORT_SYMBOL(vfs_quota_on_mount); |
| EXPORT_SYMBOL(vfs_quota_off); |
| EXPORT_SYMBOL(vfs_quota_sync); |
| EXPORT_SYMBOL(vfs_get_dqinfo); |
| EXPORT_SYMBOL(vfs_set_dqinfo); |
| EXPORT_SYMBOL(vfs_get_dqblk); |
| EXPORT_SYMBOL(vfs_set_dqblk); |
| EXPORT_SYMBOL(dquot_commit); |
| EXPORT_SYMBOL(dquot_commit_info); |
| EXPORT_SYMBOL(dquot_acquire); |
| EXPORT_SYMBOL(dquot_release); |
| EXPORT_SYMBOL(dquot_mark_dquot_dirty); |
| EXPORT_SYMBOL(dquot_initialize); |
| EXPORT_SYMBOL(dquot_drop); |
| EXPORT_SYMBOL(dquot_alloc_space); |
| EXPORT_SYMBOL(dquot_alloc_inode); |
| EXPORT_SYMBOL(dquot_free_space); |
| EXPORT_SYMBOL(dquot_free_inode); |
| EXPORT_SYMBOL(dquot_transfer); |