/* * 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 * 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/smp_lock.h> #include <linux/init.h> #include <linux/module.h> #include <linux/proc_fs.h> #include <linux/security.h> #include <linux/kmod.h> #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. * If operation is holding reference to dquot in other way (e.g. quotactl ops) * it must be guarded by dqonoff_sem. * 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 semaphore. 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 journal_lock) is following: * dqonoff_sem > journal_lock > dqptr_sem > dquot->dq_lock > dqio_sem */ spinlock_t dq_list_lock = SPIN_LOCK_UNLOCKED; spinlock_t dq_data_lock = SPIN_LOCK_UNLOCKED; 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; 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 the sync and invalidate operations, 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 struct list_head dquot_hash[NR_DQHASH]; struct dqstats dqstats; static void dqput(struct dquot *dquot); static inline int const hashfn(struct super_block *sb, unsigned int id, int type) { return((((unsigned long)sb>>L1_CACHE_SHIFT) ^ id) * (MAXQUOTAS - type)) % NR_DQHASH; } /* * Following list functions expect dq_list_lock to be held */ static inline void insert_dquot_hash(struct dquot *dquot) { struct list_head *head = dquot_hash + hashfn(dquot->dq_sb, dquot->dq_id, dquot->dq_type); list_add(&dquot->dq_hash, head); } static inline void remove_dquot_hash(struct dquot *dquot) { list_del_init(&dquot->dq_hash); } static inline struct dquot *find_dquot(unsigned int hashent, struct super_block *sb, unsigned int id, int type) { struct list_head *head; struct dquot *dquot; for (head = dquot_hash[hashent].next; head != dquot_hash+hashent; head = head->next) { dquot = list_entry(head, 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(&dquot->dq_free, free_dquots.prev); 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(&dquot->dq_inuse, inuse_list.prev); 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) { down(&dquot->dq_lock); up(&dquot->dq_lock); } #define mark_dquot_dirty(dquot) ((dquot)->dq_sb->dq_op->mark_dirty(dquot)) /* No locks needed here as ANY_DQUOT_DIRTY is used just by sync and so the * worst what can happen is that dquot is not written by concurrent sync... */ int dquot_mark_dquot_dirty(struct dquot *dquot) { set_bit(DQ_MOD_B, &(dquot)->dq_flags); set_bit(DQF_ANY_DQUOT_DIRTY_B, &(sb_dqopt((dquot)->dq_sb)-> info[(dquot)->dq_type].dqi_flags)); return 0; } 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; struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); down(&dquot->dq_lock); down(&dqopt->dqio_sem); 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); if (ret < 0) goto out_iolock; } set_bit(DQ_ACTIVE_B, &dquot->dq_flags); out_iolock: up(&dqopt->dqio_sem); up(&dquot->dq_lock); return ret; } /* * Write dquot to disk */ int dquot_commit(struct dquot *dquot) { int ret = 0; struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); down(&dqopt->dqio_sem); clear_bit(DQ_MOD_B, &dquot->dq_flags); /* 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); up(&dqopt->dqio_sem); if (info_dirty(&dqopt->info[dquot->dq_type])) dquot->dq_sb->dq_op->write_info(dquot->dq_sb, dquot->dq_type); return ret; } /* * Release dquot */ int dquot_release(struct dquot *dquot) { int ret = 0; struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); down(&dquot->dq_lock); /* Check whether we are not racing with some other dqget() */ if (atomic_read(&dquot->dq_count) > 1) goto out_dqlock; down(&dqopt->dqio_sem); ret = dqopt->ops[dquot->dq_type]->release_dqblk(dquot); clear_bit(DQ_ACTIVE_B, &dquot->dq_flags); up(&dqopt->dqio_sem); out_dqlock: up(&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. Also because we hold dqonoff_sem there can be no quota users * for this sb+type at all. */ static void invalidate_dquots(struct super_block *sb, int type) { struct dquot *dquot; struct list_head *head; spin_lock(&dq_list_lock); for (head = inuse_list.next; head != &inuse_list;) { dquot = list_entry(head, struct dquot, dq_inuse); head = head->next; if (dquot->dq_sb != sb) continue; if (dquot->dq_type != type) continue; #ifdef __DQUOT_PARANOIA if (atomic_read(&dquot->dq_count)) BUG(); #endif /* 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 *head; struct dquot *dquot; struct quota_info *dqopt = sb_dqopt(sb); int cnt; down(&dqopt->dqonoff_sem); restart: /* At this point any dirty dquot will definitely be written so we can clear dirty flag from info */ spin_lock(&dq_data_lock); for (cnt = 0; cnt < MAXQUOTAS; cnt++) if ((cnt == type || type == -1) && sb_has_quota_enabled(sb, cnt)) clear_bit(DQF_ANY_DQUOT_DIRTY_B, &dqopt->info[cnt].dqi_flags); spin_unlock(&dq_data_lock); spin_lock(&dq_list_lock); list_for_each(head, &inuse_list) { dquot = list_entry(head, struct dquot, dq_inuse); if (sb && dquot->dq_sb != sb) continue; if (type != -1 && dquot->dq_type != type) continue; if (!dquot_dirty(dquot)) continue; /* Dirty and inactive can be only bad dquot... */ if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) 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); goto restart; } 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); up(&dqopt->dqonoff_sem); 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, unsigned int gfp_mask) { int ret; spin_lock(&dq_list_lock); if (nr) prune_dqcache(nr); ret = dqstats.allocated_dquots; spin_unlock(&dq_list_lock); return ret; } /* * 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_sem 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); 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_bit(DQ_MOD_B, &dquot->dq_flags); if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { spin_unlock(&dq_list_lock); dquot_release(dquot); goto we_slept; } atomic_dec(&dquot->dq_count); #ifdef __DQUOT_PARANOIA /* sanity check */ if (!list_empty(&dquot->dq_free)) BUG(); #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_alloc(dquot_cachep, SLAB_KERNEL); if(!dquot) return NODQUOT; memset((caddr_t)dquot, 0, sizeof(struct dquot)); sema_init(&dquot->dq_lock, 1); INIT_LIST_HEAD(&dquot->dq_free); INIT_LIST_HEAD(&dquot->dq_inuse); INIT_LIST_HEAD(&dquot->dq_hash); 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_sem 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) && dquot_acquire(dquot) < 0) { dqput(dquot); return NODQUOT; } #ifdef __DQUOT_PARANOIA if (!dquot->dq_sb) /* Has somebody invalidated entry under us? */ BUG(); #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_sem semaphore */ static void add_dquot_ref(struct super_block *sb, int type) { struct list_head *p; restart: file_list_lock(); list_for_each(p, &sb->s_files) { struct file *filp = list_entry(p, struct file, f_list); struct inode *inode = filp->f_dentry->d_inode; if (filp->f_mode & FMODE_WRITE && dqinit_needed(inode, type)) { struct dentry *dentry = dget(filp->f_dentry); file_list_unlock(); sb->dq_op->initialize(inode, type); dput(dentry); /* As we may have blocked we had better restart... */ goto restart; } } file_list_unlock(); } /* 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... */ int remove_inode_dquot_ref(struct inode *inode, int type, struct list_head *tofree_head) { struct dquot *dquot = inode->i_dquot[type]; int cnt; inode->i_dquot[type] = NODQUOT; /* any other quota in use? */ for (cnt = 0; cnt < MAXQUOTAS; cnt++) { if (inode->i_dquot[cnt] != NODQUOT) goto put_it; } inode->i_flags &= ~S_QUOTA; put_it: 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); } } /* Function in inode.c - remove pointers to dquots in icache */ extern void remove_dquot_ref(struct super_block *, int, struct list_head *); /* Gather all references from inodes and drop them */ static void drop_dquot_ref(struct super_block *sb, int type) { LIST_HEAD(tofree_head); 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 inline int need_print_warning(struct dquot *dquot) { switch (dquot->dq_type) { case USRQUOTA: return current->fsuid == dquot->dq_id; case GRPQUOTA: return in_group_p(dquot->dq_id); } return 0; } /* Values of warnings */ #define NOWARN 0 #define IHARDWARN 1 #define ISOFTLONGWARN 2 #define ISOFTWARN 3 #define BHARDWARN 4 #define BSOFTLONGWARN 5 #define BSOFTWARN 6 /* Print warning to user which exceeded quota */ static void print_warning(struct dquot *dquot, const char warntype) { char *msg = NULL; int flag = (warntype == BHARDWARN || warntype == BSOFTLONGWARN) ? DQ_BLKS_B : ((warntype == IHARDWARN || warntype == ISOFTLONGWARN) ? DQ_INODES_B : 0); if (!need_print_warning(dquot) || (flag && test_and_set_bit(flag, &dquot->dq_flags))) return; tty_write_message(current->signal->tty, dquot->dq_sb->s_id); if (warntype == ISOFTWARN || warntype == BSOFTWARN) tty_write_message(current->signal->tty, ": warning, "); else tty_write_message(current->signal->tty, ": write failed, "); tty_write_message(current->signal->tty, quotatypes[dquot->dq_type]); switch (warntype) { case IHARDWARN: msg = " file limit reached.\n"; break; case ISOFTLONGWARN: msg = " file quota exceeded too long.\n"; break; case ISOFTWARN: msg = " file quota exceeded.\n"; break; case BHARDWARN: msg = " block limit reached.\n"; break; case BSOFTLONGWARN: msg = " block quota exceeded too long.\n"; break; case BSOFTWARN: msg = " block quota exceeded.\n"; break; } tty_write_message(current->signal->tty, msg); } static inline void flush_warnings(struct dquot **dquots, char *warntype) { int i; for (i = 0; i < MAXQUOTAS; i++) if (dquots[i] != NODQUOT && warntype[i] != NOWARN) print_warning(dquots[i], warntype[i]); } 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 = 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 = 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 = 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 = 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 = 0; 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 = 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 = 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 = 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 semaphore - solves deadlocks when we * re-enter the quota code and are already holding the semaphore */ 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); if (inode->i_dquot[cnt]) inode->i_flags |= S_QUOTA; } } 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); inode->i_flags &= ~S_QUOTA; 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 semaphore - solves deadlocks when we * re-enter the quota code and are already holding the semaphore */ if (IS_NOQUOTA(inode)) { out_add: inode_add_bytes(inode, number); return QUOTA_OK; } for (cnt = 0; cnt < MAXQUOTAS; cnt++) warntype[cnt] = 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 semaphore - solves deadlocks when we * re-enter the quota code and are already holding the semaphore */ if (IS_NOQUOTA(inode)) return QUOTA_OK; for (cnt = 0; cnt < MAXQUOTAS; cnt++) warntype[cnt] = 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((struct dquot **)inode->i_dquot, warntype); up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); return ret; } /* * This is a non-blocking operation. */ int dquot_free_space(struct inode *inode, qsize_t number) { unsigned int cnt; /* First test before acquiring semaphore - solves deadlocks when we * re-enter the quota code and are already holding the semaphore */ 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 is a non-blocking operation. */ int dquot_free_inode(const struct inode *inode, unsigned long number) { unsigned int cnt; /* First test before acquiring semaphore - solves deadlocks when we * re-enter the quota code and are already holding the semaphore */ 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 */ 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 semaphore - solves deadlocks when we * re-enter the quota code and are already holding the semaphore */ 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] = 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; 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); down(&dqopt->dqio_sem); ret = dqopt->ops[type]->write_file_info(sb, type); up(&dqopt->dqio_sem); 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, .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); if (!sb) goto out; /* We need to serialize quota_off() for device */ down(&dqopt->dqonoff_sem); for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 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); fput(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; } up(&dqopt->dqonoff_sem); out: return 0; } /* * Turn quotas on on a device */ /* Helper function when we already have file open */ static int vfs_quota_on_file(struct file *f, int type, int format_id) { struct quota_format_type *fmt = find_quota_format(format_id); struct inode *inode; struct super_block *sb = f->f_dentry->d_sb; struct quota_info *dqopt = sb_dqopt(sb); struct dquot *to_drop[MAXQUOTAS]; int error, cnt; unsigned int oldflags; if (!fmt) return -ESRCH; error = -EIO; if (!f->f_op || !f->f_op->read || !f->f_op->write) goto out_fmt; inode = f->f_dentry->d_inode; error = -EACCES; if (!S_ISREG(inode->i_mode)) goto out_fmt; down(&dqopt->dqonoff_sem); if (sb_has_quota_enabled(sb, type)) { error = -EBUSY; goto out_lock; } oldflags = inode->i_flags; dqopt->files[type] = f; error = -EINVAL; if (!fmt->qf_ops->check_quota_file(sb, type)) goto out_file_init; /* We don't want quota and atime on quota files (deadlocks possible) */ down_write(&dqopt->dqptr_sem); inode->i_flags |= S_NOQUOTA | S_NOATIME; for (cnt = 0; cnt < MAXQUOTAS; cnt++) { to_drop[cnt] = inode->i_dquot[cnt]; inode->i_dquot[cnt] = NODQUOT; } inode->i_flags &= ~S_QUOTA; up_write(&dqopt->dqptr_sem); /* We must put dquots outside of dqptr_sem because we may need to * start transaction for dquot_release() */ for (cnt = 0; cnt < MAXQUOTAS; cnt++) { if (to_drop[cnt]) dqput(to_drop[cnt]); } dqopt->ops[type] = fmt->qf_ops; dqopt->info[type].dqi_format = fmt; down(&dqopt->dqio_sem); if ((error = dqopt->ops[type]->read_file_info(sb, type)) < 0) { up(&dqopt->dqio_sem); goto out_file_init; } up(&dqopt->dqio_sem); set_enable_flags(dqopt, type); add_dquot_ref(sb, type); up(&dqopt->dqonoff_sem); return 0; out_file_init: inode->i_flags = oldflags; dqopt->files[type] = NULL; out_lock: up_write(&dqopt->dqptr_sem); up(&dqopt->dqonoff_sem); 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 file *f; int error; f = filp_open(path, O_RDWR, 0600); if (IS_ERR(f)) return PTR_ERR(f); error = security_quota_on(f); if (error) goto out_f; error = vfs_quota_on_file(f, type, format_id); if (!error) return 0; out_f: filp_close(f, NULL); return error; } /* * Function used by filesystems when filp_open() would fail (filesystem is * being mounted now). We will use a private file structure. Caller is * responsible that it's IO functions won't need vfsmnt structure or * some dentry tricks... */ int vfs_quota_on_mount(int type, int format_id, struct dentry *dentry) { struct file *f; int error; dget(dentry); /* Get a reference for struct file */ f = dentry_open(dentry, NULL, O_RDWR); if (IS_ERR(f)) { error = PTR_ERR(f); goto out_dentry; } error = vfs_quota_on_file(f, type, format_id); if (!error) return 0; fput(f); out_dentry: 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; down(&sb_dqopt(sb)->dqonoff_sem); if (!(dquot = dqget(sb, id, type))) { up(&sb_dqopt(sb)->dqonoff_sem); return -ESRCH; } do_get_dqblk(dquot, di); dqput(dquot); up(&sb_dqopt(sb)->dqonoff_sem); return 0; } /* Generic routine for setting common part of quota structure */ static void do_set_dqblk(struct dquot *dquot, struct if_dqblk *di) { struct mem_dqblk *dm = &dquot->dq_dqb; int check_blim = 0, check_ilim = 0; 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() + sb_dqopt(dquot->dq_sb)->info[dquot->dq_type].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() + sb_dqopt(dquot->dq_sb)->info[dquot->dq_type].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); } int vfs_set_dqblk(struct super_block *sb, int type, qid_t id, struct if_dqblk *di) { struct dquot *dquot; down(&sb_dqopt(sb)->dqonoff_sem); if (!(dquot = dqget(sb, id, type))) { up(&sb_dqopt(sb)->dqonoff_sem); return -ESRCH; } do_set_dqblk(dquot, di); dqput(dquot); up(&sb_dqopt(sb)->dqonoff_sem); return 0; } /* 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; down(&sb_dqopt(sb)->dqonoff_sem); if (!sb_has_quota_enabled(sb, type)) { up(&sb_dqopt(sb)->dqonoff_sem); 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); up(&sb_dqopt(sb)->dqonoff_sem); 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; down(&sb_dqopt(sb)->dqonoff_sem); if (!sb_has_quota_enabled(sb, type)) { up(&sb_dqopt(sb)->dqonoff_sem); 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); up(&sb_dqopt(sb)->dqonoff_sem); 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, }, { .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 }, }; /* SLAB cache for dquot structures */ kmem_cache_t *dquot_cachep; static int __init dquot_init(void) { int i; register_sysctl_table(sys_table, 0); for (i = 0; i < NR_DQHASH; i++) INIT_LIST_HEAD(dquot_hash + i); printk(KERN_NOTICE "VFS: Disk quotas %s\n", __DQUOT_VERSION__); dquot_cachep = kmem_cache_create("dquot", sizeof(struct dquot), sizeof(unsigned long) * 4, SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT, NULL, NULL); if (!dquot_cachep) panic("Cannot create dquot SLAB cache"); set_shrinker(DEFAULT_SEEKS, shrink_dqcache_memory); return 0; } module_init(dquot_init); EXPORT_SYMBOL(register_quota_format); EXPORT_SYMBOL(unregister_quota_format); EXPORT_SYMBOL(dqstats); EXPORT_SYMBOL(dq_list_lock); 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_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);