1884d179dSJan Kara /* 2884d179dSJan Kara * Implementation of the diskquota system for the LINUX operating system. QUOTA 3884d179dSJan Kara * is implemented using the BSD system call interface as the means of 4884d179dSJan Kara * communication with the user level. This file contains the generic routines 5884d179dSJan Kara * called by the different filesystems on allocation of an inode or block. 6884d179dSJan Kara * These routines take care of the administration needed to have a consistent 7884d179dSJan Kara * diskquota tracking system. The ideas of both user and group quotas are based 8884d179dSJan Kara * on the Melbourne quota system as used on BSD derived systems. The internal 9884d179dSJan Kara * implementation is based on one of the several variants of the LINUX 10884d179dSJan Kara * inode-subsystem with added complexity of the diskquota system. 11884d179dSJan Kara * 12884d179dSJan Kara * Author: Marco van Wieringen <mvw@planets.elm.net> 13884d179dSJan Kara * 14884d179dSJan Kara * Fixes: Dmitry Gorodchanin <pgmdsg@ibi.com>, 11 Feb 96 15884d179dSJan Kara * 16884d179dSJan Kara * Revised list management to avoid races 17884d179dSJan Kara * -- Bill Hawes, <whawes@star.net>, 9/98 18884d179dSJan Kara * 19884d179dSJan Kara * Fixed races in dquot_transfer(), dqget() and dquot_alloc_...(). 20884d179dSJan Kara * As the consequence the locking was moved from dquot_decr_...(), 21884d179dSJan Kara * dquot_incr_...() to calling functions. 22884d179dSJan Kara * invalidate_dquots() now writes modified dquots. 23884d179dSJan Kara * Serialized quota_off() and quota_on() for mount point. 24884d179dSJan Kara * Fixed a few bugs in grow_dquots(). 25884d179dSJan Kara * Fixed deadlock in write_dquot() - we no longer account quotas on 26884d179dSJan Kara * quota files 27884d179dSJan Kara * remove_dquot_ref() moved to inode.c - it now traverses through inodes 28884d179dSJan Kara * add_dquot_ref() restarts after blocking 29884d179dSJan Kara * Added check for bogus uid and fixed check for group in quotactl. 30884d179dSJan Kara * Jan Kara, <jack@suse.cz>, sponsored by SuSE CR, 10-11/99 31884d179dSJan Kara * 32884d179dSJan Kara * Used struct list_head instead of own list struct 33884d179dSJan Kara * Invalidation of referenced dquots is no longer possible 34884d179dSJan Kara * Improved free_dquots list management 35884d179dSJan Kara * Quota and i_blocks are now updated in one place to avoid races 36884d179dSJan Kara * Warnings are now delayed so we won't block in critical section 37884d179dSJan Kara * Write updated not to require dquot lock 38884d179dSJan Kara * Jan Kara, <jack@suse.cz>, 9/2000 39884d179dSJan Kara * 40884d179dSJan Kara * Added dynamic quota structure allocation 41884d179dSJan Kara * Jan Kara <jack@suse.cz> 12/2000 42884d179dSJan Kara * 43884d179dSJan Kara * Rewritten quota interface. Implemented new quota format and 44884d179dSJan Kara * formats registering. 45884d179dSJan Kara * Jan Kara, <jack@suse.cz>, 2001,2002 46884d179dSJan Kara * 47884d179dSJan Kara * New SMP locking. 48884d179dSJan Kara * Jan Kara, <jack@suse.cz>, 10/2002 49884d179dSJan Kara * 50884d179dSJan Kara * Added journalled quota support, fix lock inversion problems 51884d179dSJan Kara * Jan Kara, <jack@suse.cz>, 2003,2004 52884d179dSJan Kara * 53884d179dSJan Kara * (C) Copyright 1994 - 1997 Marco van Wieringen 54884d179dSJan Kara */ 55884d179dSJan Kara 56884d179dSJan Kara #include <linux/errno.h> 57884d179dSJan Kara #include <linux/kernel.h> 58884d179dSJan Kara #include <linux/fs.h> 59884d179dSJan Kara #include <linux/mount.h> 60884d179dSJan Kara #include <linux/mm.h> 61884d179dSJan Kara #include <linux/time.h> 62884d179dSJan Kara #include <linux/types.h> 63884d179dSJan Kara #include <linux/string.h> 64884d179dSJan Kara #include <linux/fcntl.h> 65884d179dSJan Kara #include <linux/stat.h> 66884d179dSJan Kara #include <linux/tty.h> 67884d179dSJan Kara #include <linux/file.h> 68884d179dSJan Kara #include <linux/slab.h> 69884d179dSJan Kara #include <linux/sysctl.h> 70884d179dSJan Kara #include <linux/init.h> 71884d179dSJan Kara #include <linux/module.h> 72884d179dSJan Kara #include <linux/proc_fs.h> 73884d179dSJan Kara #include <linux/security.h> 74884d179dSJan Kara #include <linux/kmod.h> 75884d179dSJan Kara #include <linux/namei.h> 76884d179dSJan Kara #include <linux/buffer_head.h> 77884d179dSJan Kara #include <linux/capability.h> 78884d179dSJan Kara #include <linux/quotaops.h> 79884d179dSJan Kara #include <linux/writeback.h> /* for inode_lock, oddly enough.. */ 80884d179dSJan Kara 81884d179dSJan Kara #include <asm/uaccess.h> 82884d179dSJan Kara 83884d179dSJan Kara /* 84884d179dSJan Kara * There are three quota SMP locks. dq_list_lock protects all lists with quotas 85dde95888SDmitry Monakhov * and quota formats. 86884d179dSJan Kara * dq_data_lock protects data from dq_dqb and also mem_dqinfo structures and 87884d179dSJan Kara * also guards consistency of dquot->dq_dqb with inode->i_blocks, i_bytes. 88884d179dSJan Kara * i_blocks and i_bytes updates itself are guarded by i_lock acquired directly 89884d179dSJan Kara * in inode_add_bytes() and inode_sub_bytes(). dq_state_lock protects 90884d179dSJan Kara * modifications of quota state (on quotaon and quotaoff) and readers who care 91884d179dSJan Kara * about latest values take it as well. 92884d179dSJan Kara * 93884d179dSJan Kara * The spinlock ordering is hence: dq_data_lock > dq_list_lock > i_lock, 94884d179dSJan Kara * dq_list_lock > dq_state_lock 95884d179dSJan Kara * 96884d179dSJan Kara * Note that some things (eg. sb pointer, type, id) doesn't change during 97884d179dSJan Kara * the life of the dquot structure and so needn't to be protected by a lock 98884d179dSJan Kara * 99884d179dSJan Kara * Any operation working on dquots via inode pointers must hold dqptr_sem. If 100884d179dSJan Kara * operation is just reading pointers from inode (or not using them at all) the 10126245c94SJan Kara * read lock is enough. If pointers are altered function must hold write lock. 10226245c94SJan Kara * Special care needs to be taken about S_NOQUOTA inode flag (marking that 10326245c94SJan Kara * inode is a quota file). Functions adding pointers from inode to dquots have 10426245c94SJan Kara * to check this flag under dqptr_sem and then (if S_NOQUOTA is not set) they 10526245c94SJan Kara * have to do all pointer modifications before dropping dqptr_sem. This makes 10626245c94SJan Kara * sure they cannot race with quotaon which first sets S_NOQUOTA flag and 10726245c94SJan Kara * then drops all pointers to dquots from an inode. 108884d179dSJan Kara * 109884d179dSJan Kara * Each dquot has its dq_lock mutex. Locked dquots might not be referenced 110884d179dSJan Kara * from inodes (dquot_alloc_space() and such don't check the dq_lock). 111884d179dSJan Kara * Currently dquot is locked only when it is being read to memory (or space for 112884d179dSJan Kara * it is being allocated) on the first dqget() and when it is being released on 113884d179dSJan Kara * the last dqput(). The allocation and release oparations are serialized by 114884d179dSJan Kara * the dq_lock and by checking the use count in dquot_release(). Write 115884d179dSJan Kara * operations on dquots don't hold dq_lock as they copy data under dq_data_lock 116884d179dSJan Kara * spinlock to internal buffers before writing. 117884d179dSJan Kara * 118884d179dSJan Kara * Lock ordering (including related VFS locks) is the following: 119884d179dSJan Kara * i_mutex > dqonoff_sem > journal_lock > dqptr_sem > dquot->dq_lock > 120884d179dSJan Kara * dqio_mutex 121884d179dSJan Kara * The lock ordering of dqptr_sem imposed by quota code is only dqonoff_sem > 122884d179dSJan Kara * dqptr_sem. But filesystem has to count with the fact that functions such as 123884d179dSJan Kara * dquot_alloc_space() acquire dqptr_sem and they usually have to be called 124884d179dSJan Kara * from inside a transaction to keep filesystem consistency after a crash. Also 125884d179dSJan Kara * filesystems usually want to do some IO on dquot from ->mark_dirty which is 126884d179dSJan Kara * called with dqptr_sem held. 127884d179dSJan Kara * i_mutex on quota files is special (it's below dqio_mutex) 128884d179dSJan Kara */ 129884d179dSJan Kara 130c516610cSJan Kara static __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_list_lock); 131c516610cSJan Kara static __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_state_lock); 132c516610cSJan Kara __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_data_lock); 133884d179dSJan Kara EXPORT_SYMBOL(dq_data_lock); 134884d179dSJan Kara 135fb5ffb0eSJiaying Zhang void __quota_error(struct super_block *sb, const char *func, 136fb5ffb0eSJiaying Zhang const char *fmt, ...) 137fb5ffb0eSJiaying Zhang { 138fb5ffb0eSJiaying Zhang if (printk_ratelimit()) { 139055adcbdSJoe Perches va_list args; 140055adcbdSJoe Perches struct va_format vaf; 141055adcbdSJoe Perches 142fb5ffb0eSJiaying Zhang va_start(args, fmt); 143055adcbdSJoe Perches 144055adcbdSJoe Perches vaf.fmt = fmt; 145055adcbdSJoe Perches vaf.va = &args; 146055adcbdSJoe Perches 147055adcbdSJoe Perches printk(KERN_ERR "Quota error (device %s): %s: %pV\n", 148055adcbdSJoe Perches sb->s_id, func, &vaf); 149055adcbdSJoe Perches 150fb5ffb0eSJiaying Zhang va_end(args); 151fb5ffb0eSJiaying Zhang } 152fb5ffb0eSJiaying Zhang } 153fb5ffb0eSJiaying Zhang EXPORT_SYMBOL(__quota_error); 154fb5ffb0eSJiaying Zhang 155da8d1ba2SSergey Senozhatsky #if defined(CONFIG_QUOTA_DEBUG) || defined(CONFIG_PRINT_QUOTA_WARNING) 156884d179dSJan Kara static char *quotatypes[] = INITQFNAMES; 157da8d1ba2SSergey Senozhatsky #endif 158884d179dSJan Kara static struct quota_format_type *quota_formats; /* List of registered formats */ 159884d179dSJan Kara static struct quota_module_name module_names[] = INIT_QUOTA_MODULE_NAMES; 160884d179dSJan Kara 161884d179dSJan Kara /* SLAB cache for dquot structures */ 162884d179dSJan Kara static struct kmem_cache *dquot_cachep; 163884d179dSJan Kara 164884d179dSJan Kara int register_quota_format(struct quota_format_type *fmt) 165884d179dSJan Kara { 166884d179dSJan Kara spin_lock(&dq_list_lock); 167884d179dSJan Kara fmt->qf_next = quota_formats; 168884d179dSJan Kara quota_formats = fmt; 169884d179dSJan Kara spin_unlock(&dq_list_lock); 170884d179dSJan Kara return 0; 171884d179dSJan Kara } 172884d179dSJan Kara EXPORT_SYMBOL(register_quota_format); 173884d179dSJan Kara 174884d179dSJan Kara void unregister_quota_format(struct quota_format_type *fmt) 175884d179dSJan Kara { 176884d179dSJan Kara struct quota_format_type **actqf; 177884d179dSJan Kara 178884d179dSJan Kara spin_lock(&dq_list_lock); 179268157baSJan Kara for (actqf = "a_formats; *actqf && *actqf != fmt; 180268157baSJan Kara actqf = &(*actqf)->qf_next) 181268157baSJan Kara ; 182884d179dSJan Kara if (*actqf) 183884d179dSJan Kara *actqf = (*actqf)->qf_next; 184884d179dSJan Kara spin_unlock(&dq_list_lock); 185884d179dSJan Kara } 186884d179dSJan Kara EXPORT_SYMBOL(unregister_quota_format); 187884d179dSJan Kara 188884d179dSJan Kara static struct quota_format_type *find_quota_format(int id) 189884d179dSJan Kara { 190884d179dSJan Kara struct quota_format_type *actqf; 191884d179dSJan Kara 192884d179dSJan Kara spin_lock(&dq_list_lock); 193268157baSJan Kara for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id; 194268157baSJan Kara actqf = actqf->qf_next) 195268157baSJan Kara ; 196884d179dSJan Kara if (!actqf || !try_module_get(actqf->qf_owner)) { 197884d179dSJan Kara int qm; 198884d179dSJan Kara 199884d179dSJan Kara spin_unlock(&dq_list_lock); 200884d179dSJan Kara 201268157baSJan Kara for (qm = 0; module_names[qm].qm_fmt_id && 202268157baSJan Kara module_names[qm].qm_fmt_id != id; qm++) 203268157baSJan Kara ; 204268157baSJan Kara if (!module_names[qm].qm_fmt_id || 205268157baSJan Kara request_module(module_names[qm].qm_mod_name)) 206884d179dSJan Kara return NULL; 207884d179dSJan Kara 208884d179dSJan Kara spin_lock(&dq_list_lock); 209268157baSJan Kara for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id; 210268157baSJan Kara actqf = actqf->qf_next) 211268157baSJan Kara ; 212884d179dSJan Kara if (actqf && !try_module_get(actqf->qf_owner)) 213884d179dSJan Kara actqf = NULL; 214884d179dSJan Kara } 215884d179dSJan Kara spin_unlock(&dq_list_lock); 216884d179dSJan Kara return actqf; 217884d179dSJan Kara } 218884d179dSJan Kara 219884d179dSJan Kara static void put_quota_format(struct quota_format_type *fmt) 220884d179dSJan Kara { 221884d179dSJan Kara module_put(fmt->qf_owner); 222884d179dSJan Kara } 223884d179dSJan Kara 224884d179dSJan Kara /* 225884d179dSJan Kara * Dquot List Management: 226884d179dSJan Kara * The quota code uses three lists for dquot management: the inuse_list, 227884d179dSJan Kara * free_dquots, and dquot_hash[] array. A single dquot structure may be 228884d179dSJan Kara * on all three lists, depending on its current state. 229884d179dSJan Kara * 230884d179dSJan Kara * All dquots are placed to the end of inuse_list when first created, and this 231884d179dSJan Kara * list is used for invalidate operation, which must look at every dquot. 232884d179dSJan Kara * 233884d179dSJan Kara * Unused dquots (dq_count == 0) are added to the free_dquots list when freed, 234884d179dSJan Kara * and this list is searched whenever we need an available dquot. Dquots are 235884d179dSJan Kara * removed from the list as soon as they are used again, and 236884d179dSJan Kara * dqstats.free_dquots gives the number of dquots on the list. When 237884d179dSJan Kara * dquot is invalidated it's completely released from memory. 238884d179dSJan Kara * 239884d179dSJan Kara * Dquots with a specific identity (device, type and id) are placed on 240884d179dSJan Kara * one of the dquot_hash[] hash chains. The provides an efficient search 241884d179dSJan Kara * mechanism to locate a specific dquot. 242884d179dSJan Kara */ 243884d179dSJan Kara 244884d179dSJan Kara static LIST_HEAD(inuse_list); 245884d179dSJan Kara static LIST_HEAD(free_dquots); 246884d179dSJan Kara static unsigned int dq_hash_bits, dq_hash_mask; 247884d179dSJan Kara static struct hlist_head *dquot_hash; 248884d179dSJan Kara 249884d179dSJan Kara struct dqstats dqstats; 250884d179dSJan Kara EXPORT_SYMBOL(dqstats); 251884d179dSJan Kara 2520a5a9c72SJan Kara static qsize_t inode_get_rsv_space(struct inode *inode); 253871a2931SChristoph Hellwig static void __dquot_initialize(struct inode *inode, int type); 2540a5a9c72SJan Kara 255884d179dSJan Kara static inline unsigned int 256884d179dSJan Kara hashfn(const struct super_block *sb, unsigned int id, int type) 257884d179dSJan Kara { 258884d179dSJan Kara unsigned long tmp; 259884d179dSJan Kara 260884d179dSJan Kara tmp = (((unsigned long)sb>>L1_CACHE_SHIFT) ^ id) * (MAXQUOTAS - type); 261884d179dSJan Kara return (tmp + (tmp >> dq_hash_bits)) & dq_hash_mask; 262884d179dSJan Kara } 263884d179dSJan Kara 264884d179dSJan Kara /* 265884d179dSJan Kara * Following list functions expect dq_list_lock to be held 266884d179dSJan Kara */ 267884d179dSJan Kara static inline void insert_dquot_hash(struct dquot *dquot) 268884d179dSJan Kara { 269268157baSJan Kara struct hlist_head *head; 270268157baSJan Kara head = dquot_hash + hashfn(dquot->dq_sb, dquot->dq_id, dquot->dq_type); 271884d179dSJan Kara hlist_add_head(&dquot->dq_hash, head); 272884d179dSJan Kara } 273884d179dSJan Kara 274884d179dSJan Kara static inline void remove_dquot_hash(struct dquot *dquot) 275884d179dSJan Kara { 276884d179dSJan Kara hlist_del_init(&dquot->dq_hash); 277884d179dSJan Kara } 278884d179dSJan Kara 2797a2435d8SJan Kara static struct dquot *find_dquot(unsigned int hashent, struct super_block *sb, 2807a2435d8SJan Kara unsigned int id, int type) 281884d179dSJan Kara { 282884d179dSJan Kara struct hlist_node *node; 283884d179dSJan Kara struct dquot *dquot; 284884d179dSJan Kara 285884d179dSJan Kara hlist_for_each (node, dquot_hash+hashent) { 286884d179dSJan Kara dquot = hlist_entry(node, struct dquot, dq_hash); 287268157baSJan Kara if (dquot->dq_sb == sb && dquot->dq_id == id && 288268157baSJan Kara dquot->dq_type == type) 289884d179dSJan Kara return dquot; 290884d179dSJan Kara } 291dd6f3c6dSJan Kara return NULL; 292884d179dSJan Kara } 293884d179dSJan Kara 294884d179dSJan Kara /* Add a dquot to the tail of the free list */ 295884d179dSJan Kara static inline void put_dquot_last(struct dquot *dquot) 296884d179dSJan Kara { 297884d179dSJan Kara list_add_tail(&dquot->dq_free, &free_dquots); 298dde95888SDmitry Monakhov dqstats_inc(DQST_FREE_DQUOTS); 299884d179dSJan Kara } 300884d179dSJan Kara 301884d179dSJan Kara static inline void remove_free_dquot(struct dquot *dquot) 302884d179dSJan Kara { 303884d179dSJan Kara if (list_empty(&dquot->dq_free)) 304884d179dSJan Kara return; 305884d179dSJan Kara list_del_init(&dquot->dq_free); 306dde95888SDmitry Monakhov dqstats_dec(DQST_FREE_DQUOTS); 307884d179dSJan Kara } 308884d179dSJan Kara 309884d179dSJan Kara static inline void put_inuse(struct dquot *dquot) 310884d179dSJan Kara { 311884d179dSJan Kara /* We add to the back of inuse list so we don't have to restart 312884d179dSJan Kara * when traversing this list and we block */ 313884d179dSJan Kara list_add_tail(&dquot->dq_inuse, &inuse_list); 314dde95888SDmitry Monakhov dqstats_inc(DQST_ALLOC_DQUOTS); 315884d179dSJan Kara } 316884d179dSJan Kara 317884d179dSJan Kara static inline void remove_inuse(struct dquot *dquot) 318884d179dSJan Kara { 319dde95888SDmitry Monakhov dqstats_dec(DQST_ALLOC_DQUOTS); 320884d179dSJan Kara list_del(&dquot->dq_inuse); 321884d179dSJan Kara } 322884d179dSJan Kara /* 323884d179dSJan Kara * End of list functions needing dq_list_lock 324884d179dSJan Kara */ 325884d179dSJan Kara 326884d179dSJan Kara static void wait_on_dquot(struct dquot *dquot) 327884d179dSJan Kara { 328884d179dSJan Kara mutex_lock(&dquot->dq_lock); 329884d179dSJan Kara mutex_unlock(&dquot->dq_lock); 330884d179dSJan Kara } 331884d179dSJan Kara 332884d179dSJan Kara static inline int dquot_dirty(struct dquot *dquot) 333884d179dSJan Kara { 334884d179dSJan Kara return test_bit(DQ_MOD_B, &dquot->dq_flags); 335884d179dSJan Kara } 336884d179dSJan Kara 337884d179dSJan Kara static inline int mark_dquot_dirty(struct dquot *dquot) 338884d179dSJan Kara { 339884d179dSJan Kara return dquot->dq_sb->dq_op->mark_dirty(dquot); 340884d179dSJan Kara } 341884d179dSJan Kara 342eabf290dSDmitry Monakhov /* Mark dquot dirty in atomic manner, and return it's old dirty flag state */ 343884d179dSJan Kara int dquot_mark_dquot_dirty(struct dquot *dquot) 344884d179dSJan Kara { 345eabf290dSDmitry Monakhov int ret = 1; 346eabf290dSDmitry Monakhov 347eabf290dSDmitry Monakhov /* If quota is dirty already, we don't have to acquire dq_list_lock */ 348eabf290dSDmitry Monakhov if (test_bit(DQ_MOD_B, &dquot->dq_flags)) 349eabf290dSDmitry Monakhov return 1; 350eabf290dSDmitry Monakhov 351884d179dSJan Kara spin_lock(&dq_list_lock); 352eabf290dSDmitry Monakhov if (!test_and_set_bit(DQ_MOD_B, &dquot->dq_flags)) { 353884d179dSJan Kara list_add(&dquot->dq_dirty, &sb_dqopt(dquot->dq_sb)-> 354884d179dSJan Kara info[dquot->dq_type].dqi_dirty_list); 355eabf290dSDmitry Monakhov ret = 0; 356eabf290dSDmitry Monakhov } 357884d179dSJan Kara spin_unlock(&dq_list_lock); 358eabf290dSDmitry Monakhov return ret; 359884d179dSJan Kara } 360884d179dSJan Kara EXPORT_SYMBOL(dquot_mark_dquot_dirty); 361884d179dSJan Kara 362dc52dd3aSDmitry Monakhov /* Dirtify all the dquots - this can block when journalling */ 363dc52dd3aSDmitry Monakhov static inline int mark_all_dquot_dirty(struct dquot * const *dquot) 364dc52dd3aSDmitry Monakhov { 365dc52dd3aSDmitry Monakhov int ret, err, cnt; 366dc52dd3aSDmitry Monakhov 367dc52dd3aSDmitry Monakhov ret = err = 0; 368dc52dd3aSDmitry Monakhov for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 369dc52dd3aSDmitry Monakhov if (dquot[cnt]) 370dc52dd3aSDmitry Monakhov /* Even in case of error we have to continue */ 371dc52dd3aSDmitry Monakhov ret = mark_dquot_dirty(dquot[cnt]); 372dc52dd3aSDmitry Monakhov if (!err) 373dc52dd3aSDmitry Monakhov err = ret; 374dc52dd3aSDmitry Monakhov } 375dc52dd3aSDmitry Monakhov return err; 376dc52dd3aSDmitry Monakhov } 377dc52dd3aSDmitry Monakhov 378dc52dd3aSDmitry Monakhov static inline void dqput_all(struct dquot **dquot) 379dc52dd3aSDmitry Monakhov { 380dc52dd3aSDmitry Monakhov unsigned int cnt; 381dc52dd3aSDmitry Monakhov 382dc52dd3aSDmitry Monakhov for (cnt = 0; cnt < MAXQUOTAS; cnt++) 383dc52dd3aSDmitry Monakhov dqput(dquot[cnt]); 384dc52dd3aSDmitry Monakhov } 385dc52dd3aSDmitry Monakhov 386884d179dSJan Kara /* This function needs dq_list_lock */ 387884d179dSJan Kara static inline int clear_dquot_dirty(struct dquot *dquot) 388884d179dSJan Kara { 389884d179dSJan Kara if (!test_and_clear_bit(DQ_MOD_B, &dquot->dq_flags)) 390884d179dSJan Kara return 0; 391884d179dSJan Kara list_del_init(&dquot->dq_dirty); 392884d179dSJan Kara return 1; 393884d179dSJan Kara } 394884d179dSJan Kara 395884d179dSJan Kara void mark_info_dirty(struct super_block *sb, int type) 396884d179dSJan Kara { 397884d179dSJan Kara set_bit(DQF_INFO_DIRTY_B, &sb_dqopt(sb)->info[type].dqi_flags); 398884d179dSJan Kara } 399884d179dSJan Kara EXPORT_SYMBOL(mark_info_dirty); 400884d179dSJan Kara 401884d179dSJan Kara /* 402884d179dSJan Kara * Read dquot from disk and alloc space for it 403884d179dSJan Kara */ 404884d179dSJan Kara 405884d179dSJan Kara int dquot_acquire(struct dquot *dquot) 406884d179dSJan Kara { 407884d179dSJan Kara int ret = 0, ret2 = 0; 408884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); 409884d179dSJan Kara 410884d179dSJan Kara mutex_lock(&dquot->dq_lock); 411884d179dSJan Kara mutex_lock(&dqopt->dqio_mutex); 412884d179dSJan Kara if (!test_bit(DQ_READ_B, &dquot->dq_flags)) 413884d179dSJan Kara ret = dqopt->ops[dquot->dq_type]->read_dqblk(dquot); 414884d179dSJan Kara if (ret < 0) 415884d179dSJan Kara goto out_iolock; 416884d179dSJan Kara set_bit(DQ_READ_B, &dquot->dq_flags); 417884d179dSJan Kara /* Instantiate dquot if needed */ 418884d179dSJan Kara if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && !dquot->dq_off) { 419884d179dSJan Kara ret = dqopt->ops[dquot->dq_type]->commit_dqblk(dquot); 420884d179dSJan Kara /* Write the info if needed */ 421268157baSJan Kara if (info_dirty(&dqopt->info[dquot->dq_type])) { 422268157baSJan Kara ret2 = dqopt->ops[dquot->dq_type]->write_file_info( 423268157baSJan Kara dquot->dq_sb, dquot->dq_type); 424268157baSJan Kara } 425884d179dSJan Kara if (ret < 0) 426884d179dSJan Kara goto out_iolock; 427884d179dSJan Kara if (ret2 < 0) { 428884d179dSJan Kara ret = ret2; 429884d179dSJan Kara goto out_iolock; 430884d179dSJan Kara } 431884d179dSJan Kara } 432884d179dSJan Kara set_bit(DQ_ACTIVE_B, &dquot->dq_flags); 433884d179dSJan Kara out_iolock: 434884d179dSJan Kara mutex_unlock(&dqopt->dqio_mutex); 435884d179dSJan Kara mutex_unlock(&dquot->dq_lock); 436884d179dSJan Kara return ret; 437884d179dSJan Kara } 438884d179dSJan Kara EXPORT_SYMBOL(dquot_acquire); 439884d179dSJan Kara 440884d179dSJan Kara /* 441884d179dSJan Kara * Write dquot to disk 442884d179dSJan Kara */ 443884d179dSJan Kara int dquot_commit(struct dquot *dquot) 444884d179dSJan Kara { 445884d179dSJan Kara int ret = 0, ret2 = 0; 446884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); 447884d179dSJan Kara 448884d179dSJan Kara mutex_lock(&dqopt->dqio_mutex); 449884d179dSJan Kara spin_lock(&dq_list_lock); 450884d179dSJan Kara if (!clear_dquot_dirty(dquot)) { 451884d179dSJan Kara spin_unlock(&dq_list_lock); 452884d179dSJan Kara goto out_sem; 453884d179dSJan Kara } 454884d179dSJan Kara spin_unlock(&dq_list_lock); 455884d179dSJan Kara /* Inactive dquot can be only if there was error during read/init 456884d179dSJan Kara * => we have better not writing it */ 457884d179dSJan Kara if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { 458884d179dSJan Kara ret = dqopt->ops[dquot->dq_type]->commit_dqblk(dquot); 459268157baSJan Kara if (info_dirty(&dqopt->info[dquot->dq_type])) { 460268157baSJan Kara ret2 = dqopt->ops[dquot->dq_type]->write_file_info( 461268157baSJan Kara dquot->dq_sb, dquot->dq_type); 462268157baSJan Kara } 463884d179dSJan Kara if (ret >= 0) 464884d179dSJan Kara ret = ret2; 465884d179dSJan Kara } 466884d179dSJan Kara out_sem: 467884d179dSJan Kara mutex_unlock(&dqopt->dqio_mutex); 468884d179dSJan Kara return ret; 469884d179dSJan Kara } 470884d179dSJan Kara EXPORT_SYMBOL(dquot_commit); 471884d179dSJan Kara 472884d179dSJan Kara /* 473884d179dSJan Kara * Release dquot 474884d179dSJan Kara */ 475884d179dSJan Kara int dquot_release(struct dquot *dquot) 476884d179dSJan Kara { 477884d179dSJan Kara int ret = 0, ret2 = 0; 478884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); 479884d179dSJan Kara 480884d179dSJan Kara mutex_lock(&dquot->dq_lock); 481884d179dSJan Kara /* Check whether we are not racing with some other dqget() */ 482884d179dSJan Kara if (atomic_read(&dquot->dq_count) > 1) 483884d179dSJan Kara goto out_dqlock; 484884d179dSJan Kara mutex_lock(&dqopt->dqio_mutex); 485884d179dSJan Kara if (dqopt->ops[dquot->dq_type]->release_dqblk) { 486884d179dSJan Kara ret = dqopt->ops[dquot->dq_type]->release_dqblk(dquot); 487884d179dSJan Kara /* Write the info */ 488268157baSJan Kara if (info_dirty(&dqopt->info[dquot->dq_type])) { 489268157baSJan Kara ret2 = dqopt->ops[dquot->dq_type]->write_file_info( 490268157baSJan Kara dquot->dq_sb, dquot->dq_type); 491268157baSJan Kara } 492884d179dSJan Kara if (ret >= 0) 493884d179dSJan Kara ret = ret2; 494884d179dSJan Kara } 495884d179dSJan Kara clear_bit(DQ_ACTIVE_B, &dquot->dq_flags); 496884d179dSJan Kara mutex_unlock(&dqopt->dqio_mutex); 497884d179dSJan Kara out_dqlock: 498884d179dSJan Kara mutex_unlock(&dquot->dq_lock); 499884d179dSJan Kara return ret; 500884d179dSJan Kara } 501884d179dSJan Kara EXPORT_SYMBOL(dquot_release); 502884d179dSJan Kara 503884d179dSJan Kara void dquot_destroy(struct dquot *dquot) 504884d179dSJan Kara { 505884d179dSJan Kara kmem_cache_free(dquot_cachep, dquot); 506884d179dSJan Kara } 507884d179dSJan Kara EXPORT_SYMBOL(dquot_destroy); 508884d179dSJan Kara 509884d179dSJan Kara static inline void do_destroy_dquot(struct dquot *dquot) 510884d179dSJan Kara { 511884d179dSJan Kara dquot->dq_sb->dq_op->destroy_dquot(dquot); 512884d179dSJan Kara } 513884d179dSJan Kara 514884d179dSJan Kara /* Invalidate all dquots on the list. Note that this function is called after 515884d179dSJan Kara * quota is disabled and pointers from inodes removed so there cannot be new 516884d179dSJan Kara * quota users. There can still be some users of quotas due to inodes being 517884d179dSJan Kara * just deleted or pruned by prune_icache() (those are not attached to any 518884d179dSJan Kara * list) or parallel quotactl call. We have to wait for such users. 519884d179dSJan Kara */ 520884d179dSJan Kara static void invalidate_dquots(struct super_block *sb, int type) 521884d179dSJan Kara { 522884d179dSJan Kara struct dquot *dquot, *tmp; 523884d179dSJan Kara 524884d179dSJan Kara restart: 525884d179dSJan Kara spin_lock(&dq_list_lock); 526884d179dSJan Kara list_for_each_entry_safe(dquot, tmp, &inuse_list, dq_inuse) { 527884d179dSJan Kara if (dquot->dq_sb != sb) 528884d179dSJan Kara continue; 529884d179dSJan Kara if (dquot->dq_type != type) 530884d179dSJan Kara continue; 531884d179dSJan Kara /* Wait for dquot users */ 532884d179dSJan Kara if (atomic_read(&dquot->dq_count)) { 533884d179dSJan Kara DEFINE_WAIT(wait); 534884d179dSJan Kara 535884d179dSJan Kara atomic_inc(&dquot->dq_count); 536884d179dSJan Kara prepare_to_wait(&dquot->dq_wait_unused, &wait, 537884d179dSJan Kara TASK_UNINTERRUPTIBLE); 538884d179dSJan Kara spin_unlock(&dq_list_lock); 539884d179dSJan Kara /* Once dqput() wakes us up, we know it's time to free 540884d179dSJan Kara * the dquot. 541884d179dSJan Kara * IMPORTANT: we rely on the fact that there is always 542884d179dSJan Kara * at most one process waiting for dquot to free. 543884d179dSJan Kara * Otherwise dq_count would be > 1 and we would never 544884d179dSJan Kara * wake up. 545884d179dSJan Kara */ 546884d179dSJan Kara if (atomic_read(&dquot->dq_count) > 1) 547884d179dSJan Kara schedule(); 548884d179dSJan Kara finish_wait(&dquot->dq_wait_unused, &wait); 549884d179dSJan Kara dqput(dquot); 550884d179dSJan Kara /* At this moment dquot() need not exist (it could be 551884d179dSJan Kara * reclaimed by prune_dqcache(). Hence we must 552884d179dSJan Kara * restart. */ 553884d179dSJan Kara goto restart; 554884d179dSJan Kara } 555884d179dSJan Kara /* 556884d179dSJan Kara * Quota now has no users and it has been written on last 557884d179dSJan Kara * dqput() 558884d179dSJan Kara */ 559884d179dSJan Kara remove_dquot_hash(dquot); 560884d179dSJan Kara remove_free_dquot(dquot); 561884d179dSJan Kara remove_inuse(dquot); 562884d179dSJan Kara do_destroy_dquot(dquot); 563884d179dSJan Kara } 564884d179dSJan Kara spin_unlock(&dq_list_lock); 565884d179dSJan Kara } 566884d179dSJan Kara 567884d179dSJan Kara /* Call callback for every active dquot on given filesystem */ 568884d179dSJan Kara int dquot_scan_active(struct super_block *sb, 569884d179dSJan Kara int (*fn)(struct dquot *dquot, unsigned long priv), 570884d179dSJan Kara unsigned long priv) 571884d179dSJan Kara { 572884d179dSJan Kara struct dquot *dquot, *old_dquot = NULL; 573884d179dSJan Kara int ret = 0; 574884d179dSJan Kara 575884d179dSJan Kara mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); 576884d179dSJan Kara spin_lock(&dq_list_lock); 577884d179dSJan Kara list_for_each_entry(dquot, &inuse_list, dq_inuse) { 578884d179dSJan Kara if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) 579884d179dSJan Kara continue; 580884d179dSJan Kara if (dquot->dq_sb != sb) 581884d179dSJan Kara continue; 582884d179dSJan Kara /* Now we have active dquot so we can just increase use count */ 583884d179dSJan Kara atomic_inc(&dquot->dq_count); 584884d179dSJan Kara spin_unlock(&dq_list_lock); 585dde95888SDmitry Monakhov dqstats_inc(DQST_LOOKUPS); 586884d179dSJan Kara dqput(old_dquot); 587884d179dSJan Kara old_dquot = dquot; 588884d179dSJan Kara ret = fn(dquot, priv); 589884d179dSJan Kara if (ret < 0) 590884d179dSJan Kara goto out; 591884d179dSJan Kara spin_lock(&dq_list_lock); 592884d179dSJan Kara /* We are safe to continue now because our dquot could not 593884d179dSJan Kara * be moved out of the inuse list while we hold the reference */ 594884d179dSJan Kara } 595884d179dSJan Kara spin_unlock(&dq_list_lock); 596884d179dSJan Kara out: 597884d179dSJan Kara dqput(old_dquot); 598884d179dSJan Kara mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); 599884d179dSJan Kara return ret; 600884d179dSJan Kara } 601884d179dSJan Kara EXPORT_SYMBOL(dquot_scan_active); 602884d179dSJan Kara 603287a8095SChristoph Hellwig int dquot_quota_sync(struct super_block *sb, int type, int wait) 604884d179dSJan Kara { 605884d179dSJan Kara struct list_head *dirty; 606884d179dSJan Kara struct dquot *dquot; 607884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 608884d179dSJan Kara int cnt; 609884d179dSJan Kara 610884d179dSJan Kara mutex_lock(&dqopt->dqonoff_mutex); 611884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 612884d179dSJan Kara if (type != -1 && cnt != type) 613884d179dSJan Kara continue; 614884d179dSJan Kara if (!sb_has_quota_active(sb, cnt)) 615884d179dSJan Kara continue; 616884d179dSJan Kara spin_lock(&dq_list_lock); 617884d179dSJan Kara dirty = &dqopt->info[cnt].dqi_dirty_list; 618884d179dSJan Kara while (!list_empty(dirty)) { 619268157baSJan Kara dquot = list_first_entry(dirty, struct dquot, 620268157baSJan Kara dq_dirty); 621884d179dSJan Kara /* Dirty and inactive can be only bad dquot... */ 622884d179dSJan Kara if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { 623884d179dSJan Kara clear_dquot_dirty(dquot); 624884d179dSJan Kara continue; 625884d179dSJan Kara } 626884d179dSJan Kara /* Now we have active dquot from which someone is 627884d179dSJan Kara * holding reference so we can safely just increase 628884d179dSJan Kara * use count */ 629884d179dSJan Kara atomic_inc(&dquot->dq_count); 630884d179dSJan Kara spin_unlock(&dq_list_lock); 631dde95888SDmitry Monakhov dqstats_inc(DQST_LOOKUPS); 632884d179dSJan Kara sb->dq_op->write_dquot(dquot); 633884d179dSJan Kara dqput(dquot); 634884d179dSJan Kara spin_lock(&dq_list_lock); 635884d179dSJan Kara } 636884d179dSJan Kara spin_unlock(&dq_list_lock); 637884d179dSJan Kara } 638884d179dSJan Kara 639884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 640884d179dSJan Kara if ((cnt == type || type == -1) && sb_has_quota_active(sb, cnt) 641884d179dSJan Kara && info_dirty(&dqopt->info[cnt])) 642884d179dSJan Kara sb->dq_op->write_info(sb, cnt); 643dde95888SDmitry Monakhov dqstats_inc(DQST_SYNCS); 644884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 645884d179dSJan Kara 6465fb324adSChristoph Hellwig if (!wait || (sb_dqopt(sb)->flags & DQUOT_QUOTA_SYS_FILE)) 6475fb324adSChristoph Hellwig return 0; 6485fb324adSChristoph Hellwig 6495fb324adSChristoph Hellwig /* This is not very clever (and fast) but currently I don't know about 6505fb324adSChristoph Hellwig * any other simple way of getting quota data to disk and we must get 6515fb324adSChristoph Hellwig * them there for userspace to be visible... */ 6525fb324adSChristoph Hellwig if (sb->s_op->sync_fs) 6535fb324adSChristoph Hellwig sb->s_op->sync_fs(sb, 1); 6545fb324adSChristoph Hellwig sync_blockdev(sb->s_bdev); 6555fb324adSChristoph Hellwig 6565fb324adSChristoph Hellwig /* 6575fb324adSChristoph Hellwig * Now when everything is written we can discard the pagecache so 6585fb324adSChristoph Hellwig * that userspace sees the changes. 6595fb324adSChristoph Hellwig */ 6605fb324adSChristoph Hellwig mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); 6615fb324adSChristoph Hellwig for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 6625fb324adSChristoph Hellwig if (type != -1 && cnt != type) 6635fb324adSChristoph Hellwig continue; 6645fb324adSChristoph Hellwig if (!sb_has_quota_active(sb, cnt)) 6655fb324adSChristoph Hellwig continue; 6665fb324adSChristoph Hellwig mutex_lock_nested(&sb_dqopt(sb)->files[cnt]->i_mutex, 6675fb324adSChristoph Hellwig I_MUTEX_QUOTA); 6685fb324adSChristoph Hellwig truncate_inode_pages(&sb_dqopt(sb)->files[cnt]->i_data, 0); 6695fb324adSChristoph Hellwig mutex_unlock(&sb_dqopt(sb)->files[cnt]->i_mutex); 6705fb324adSChristoph Hellwig } 6715fb324adSChristoph Hellwig mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); 6725fb324adSChristoph Hellwig 673884d179dSJan Kara return 0; 674884d179dSJan Kara } 675287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_quota_sync); 676884d179dSJan Kara 677884d179dSJan Kara /* Free unused dquots from cache */ 678884d179dSJan Kara static void prune_dqcache(int count) 679884d179dSJan Kara { 680884d179dSJan Kara struct list_head *head; 681884d179dSJan Kara struct dquot *dquot; 682884d179dSJan Kara 683884d179dSJan Kara head = free_dquots.prev; 684884d179dSJan Kara while (head != &free_dquots && count) { 685884d179dSJan Kara dquot = list_entry(head, struct dquot, dq_free); 686884d179dSJan Kara remove_dquot_hash(dquot); 687884d179dSJan Kara remove_free_dquot(dquot); 688884d179dSJan Kara remove_inuse(dquot); 689884d179dSJan Kara do_destroy_dquot(dquot); 690884d179dSJan Kara count--; 691884d179dSJan Kara head = free_dquots.prev; 692884d179dSJan Kara } 693884d179dSJan Kara } 694884d179dSJan Kara 695884d179dSJan Kara /* 696884d179dSJan Kara * This is called from kswapd when we think we need some 697884d179dSJan Kara * more memory 698884d179dSJan Kara */ 6997f8275d0SDave Chinner static int shrink_dqcache_memory(struct shrinker *shrink, int nr, gfp_t gfp_mask) 700884d179dSJan Kara { 701884d179dSJan Kara if (nr) { 702884d179dSJan Kara spin_lock(&dq_list_lock); 703884d179dSJan Kara prune_dqcache(nr); 704884d179dSJan Kara spin_unlock(&dq_list_lock); 705884d179dSJan Kara } 706f32764bdSDmitry Monakhov return ((unsigned) 707f32764bdSDmitry Monakhov percpu_counter_read_positive(&dqstats.counter[DQST_FREE_DQUOTS]) 708f32764bdSDmitry Monakhov /100) * sysctl_vfs_cache_pressure; 709884d179dSJan Kara } 710884d179dSJan Kara 711884d179dSJan Kara static struct shrinker dqcache_shrinker = { 712884d179dSJan Kara .shrink = shrink_dqcache_memory, 713884d179dSJan Kara .seeks = DEFAULT_SEEKS, 714884d179dSJan Kara }; 715884d179dSJan Kara 716884d179dSJan Kara /* 717884d179dSJan Kara * Put reference to dquot 718884d179dSJan Kara * NOTE: If you change this function please check whether dqput_blocks() works right... 719884d179dSJan Kara */ 720884d179dSJan Kara void dqput(struct dquot *dquot) 721884d179dSJan Kara { 722884d179dSJan Kara int ret; 723884d179dSJan Kara 724884d179dSJan Kara if (!dquot) 725884d179dSJan Kara return; 72662af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 727884d179dSJan Kara if (!atomic_read(&dquot->dq_count)) { 728fb5ffb0eSJiaying Zhang quota_error(dquot->dq_sb, "trying to free free dquot of %s %d", 729fb5ffb0eSJiaying Zhang quotatypes[dquot->dq_type], dquot->dq_id); 730884d179dSJan Kara BUG(); 731884d179dSJan Kara } 732884d179dSJan Kara #endif 733dde95888SDmitry Monakhov dqstats_inc(DQST_DROPS); 734884d179dSJan Kara we_slept: 735884d179dSJan Kara spin_lock(&dq_list_lock); 736884d179dSJan Kara if (atomic_read(&dquot->dq_count) > 1) { 737884d179dSJan Kara /* We have more than one user... nothing to do */ 738884d179dSJan Kara atomic_dec(&dquot->dq_count); 739884d179dSJan Kara /* Releasing dquot during quotaoff phase? */ 740884d179dSJan Kara if (!sb_has_quota_active(dquot->dq_sb, dquot->dq_type) && 741884d179dSJan Kara atomic_read(&dquot->dq_count) == 1) 742884d179dSJan Kara wake_up(&dquot->dq_wait_unused); 743884d179dSJan Kara spin_unlock(&dq_list_lock); 744884d179dSJan Kara return; 745884d179dSJan Kara } 746884d179dSJan Kara /* Need to release dquot? */ 747884d179dSJan Kara if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && dquot_dirty(dquot)) { 748884d179dSJan Kara spin_unlock(&dq_list_lock); 749884d179dSJan Kara /* Commit dquot before releasing */ 750884d179dSJan Kara ret = dquot->dq_sb->dq_op->write_dquot(dquot); 751884d179dSJan Kara if (ret < 0) { 752fb5ffb0eSJiaying Zhang quota_error(dquot->dq_sb, "Can't write quota structure" 753fb5ffb0eSJiaying Zhang " (error %d). Quota may get out of sync!", 754fb5ffb0eSJiaying Zhang ret); 755884d179dSJan Kara /* 756884d179dSJan Kara * We clear dirty bit anyway, so that we avoid 757884d179dSJan Kara * infinite loop here 758884d179dSJan Kara */ 759884d179dSJan Kara spin_lock(&dq_list_lock); 760884d179dSJan Kara clear_dquot_dirty(dquot); 761884d179dSJan Kara spin_unlock(&dq_list_lock); 762884d179dSJan Kara } 763884d179dSJan Kara goto we_slept; 764884d179dSJan Kara } 765884d179dSJan Kara /* Clear flag in case dquot was inactive (something bad happened) */ 766884d179dSJan Kara clear_dquot_dirty(dquot); 767884d179dSJan Kara if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { 768884d179dSJan Kara spin_unlock(&dq_list_lock); 769884d179dSJan Kara dquot->dq_sb->dq_op->release_dquot(dquot); 770884d179dSJan Kara goto we_slept; 771884d179dSJan Kara } 772884d179dSJan Kara atomic_dec(&dquot->dq_count); 77362af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 774884d179dSJan Kara /* sanity check */ 775884d179dSJan Kara BUG_ON(!list_empty(&dquot->dq_free)); 776884d179dSJan Kara #endif 777884d179dSJan Kara put_dquot_last(dquot); 778884d179dSJan Kara spin_unlock(&dq_list_lock); 779884d179dSJan Kara } 780884d179dSJan Kara EXPORT_SYMBOL(dqput); 781884d179dSJan Kara 782884d179dSJan Kara struct dquot *dquot_alloc(struct super_block *sb, int type) 783884d179dSJan Kara { 784884d179dSJan Kara return kmem_cache_zalloc(dquot_cachep, GFP_NOFS); 785884d179dSJan Kara } 786884d179dSJan Kara EXPORT_SYMBOL(dquot_alloc); 787884d179dSJan Kara 788884d179dSJan Kara static struct dquot *get_empty_dquot(struct super_block *sb, int type) 789884d179dSJan Kara { 790884d179dSJan Kara struct dquot *dquot; 791884d179dSJan Kara 792884d179dSJan Kara dquot = sb->dq_op->alloc_dquot(sb, type); 793884d179dSJan Kara if(!dquot) 794dd6f3c6dSJan Kara return NULL; 795884d179dSJan Kara 796884d179dSJan Kara mutex_init(&dquot->dq_lock); 797884d179dSJan Kara INIT_LIST_HEAD(&dquot->dq_free); 798884d179dSJan Kara INIT_LIST_HEAD(&dquot->dq_inuse); 799884d179dSJan Kara INIT_HLIST_NODE(&dquot->dq_hash); 800884d179dSJan Kara INIT_LIST_HEAD(&dquot->dq_dirty); 801884d179dSJan Kara init_waitqueue_head(&dquot->dq_wait_unused); 802884d179dSJan Kara dquot->dq_sb = sb; 803884d179dSJan Kara dquot->dq_type = type; 804884d179dSJan Kara atomic_set(&dquot->dq_count, 1); 805884d179dSJan Kara 806884d179dSJan Kara return dquot; 807884d179dSJan Kara } 808884d179dSJan Kara 809884d179dSJan Kara /* 810884d179dSJan Kara * Get reference to dquot 811884d179dSJan Kara * 812884d179dSJan Kara * Locking is slightly tricky here. We are guarded from parallel quotaoff() 813884d179dSJan Kara * destroying our dquot by: 814884d179dSJan Kara * a) checking for quota flags under dq_list_lock and 815884d179dSJan Kara * b) getting a reference to dquot before we release dq_list_lock 816884d179dSJan Kara */ 817884d179dSJan Kara struct dquot *dqget(struct super_block *sb, unsigned int id, int type) 818884d179dSJan Kara { 819884d179dSJan Kara unsigned int hashent = hashfn(sb, id, type); 820dd6f3c6dSJan Kara struct dquot *dquot = NULL, *empty = NULL; 821884d179dSJan Kara 822884d179dSJan Kara if (!sb_has_quota_active(sb, type)) 823dd6f3c6dSJan Kara return NULL; 824884d179dSJan Kara we_slept: 825884d179dSJan Kara spin_lock(&dq_list_lock); 826884d179dSJan Kara spin_lock(&dq_state_lock); 827884d179dSJan Kara if (!sb_has_quota_active(sb, type)) { 828884d179dSJan Kara spin_unlock(&dq_state_lock); 829884d179dSJan Kara spin_unlock(&dq_list_lock); 830884d179dSJan Kara goto out; 831884d179dSJan Kara } 832884d179dSJan Kara spin_unlock(&dq_state_lock); 833884d179dSJan Kara 834dd6f3c6dSJan Kara dquot = find_dquot(hashent, sb, id, type); 835dd6f3c6dSJan Kara if (!dquot) { 836dd6f3c6dSJan Kara if (!empty) { 837884d179dSJan Kara spin_unlock(&dq_list_lock); 838dd6f3c6dSJan Kara empty = get_empty_dquot(sb, type); 839dd6f3c6dSJan Kara if (!empty) 840884d179dSJan Kara schedule(); /* Try to wait for a moment... */ 841884d179dSJan Kara goto we_slept; 842884d179dSJan Kara } 843884d179dSJan Kara dquot = empty; 844dd6f3c6dSJan Kara empty = NULL; 845884d179dSJan Kara dquot->dq_id = id; 846884d179dSJan Kara /* all dquots go on the inuse_list */ 847884d179dSJan Kara put_inuse(dquot); 848884d179dSJan Kara /* hash it first so it can be found */ 849884d179dSJan Kara insert_dquot_hash(dquot); 850884d179dSJan Kara spin_unlock(&dq_list_lock); 851dde95888SDmitry Monakhov dqstats_inc(DQST_LOOKUPS); 852884d179dSJan Kara } else { 853884d179dSJan Kara if (!atomic_read(&dquot->dq_count)) 854884d179dSJan Kara remove_free_dquot(dquot); 855884d179dSJan Kara atomic_inc(&dquot->dq_count); 856884d179dSJan Kara spin_unlock(&dq_list_lock); 857dde95888SDmitry Monakhov dqstats_inc(DQST_CACHE_HITS); 858dde95888SDmitry Monakhov dqstats_inc(DQST_LOOKUPS); 859884d179dSJan Kara } 860268157baSJan Kara /* Wait for dq_lock - after this we know that either dquot_release() is 861268157baSJan Kara * already finished or it will be canceled due to dq_count > 1 test */ 862884d179dSJan Kara wait_on_dquot(dquot); 863268157baSJan Kara /* Read the dquot / allocate space in quota file */ 864268157baSJan Kara if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && 865268157baSJan Kara sb->dq_op->acquire_dquot(dquot) < 0) { 866884d179dSJan Kara dqput(dquot); 867dd6f3c6dSJan Kara dquot = NULL; 868884d179dSJan Kara goto out; 869884d179dSJan Kara } 87062af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 871884d179dSJan Kara BUG_ON(!dquot->dq_sb); /* Has somebody invalidated entry under us? */ 872884d179dSJan Kara #endif 873884d179dSJan Kara out: 874884d179dSJan Kara if (empty) 875884d179dSJan Kara do_destroy_dquot(empty); 876884d179dSJan Kara 877884d179dSJan Kara return dquot; 878884d179dSJan Kara } 879884d179dSJan Kara EXPORT_SYMBOL(dqget); 880884d179dSJan Kara 881884d179dSJan Kara static int dqinit_needed(struct inode *inode, int type) 882884d179dSJan Kara { 883884d179dSJan Kara int cnt; 884884d179dSJan Kara 885884d179dSJan Kara if (IS_NOQUOTA(inode)) 886884d179dSJan Kara return 0; 887884d179dSJan Kara if (type != -1) 888dd6f3c6dSJan Kara return !inode->i_dquot[type]; 889884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 890dd6f3c6dSJan Kara if (!inode->i_dquot[cnt]) 891884d179dSJan Kara return 1; 892884d179dSJan Kara return 0; 893884d179dSJan Kara } 894884d179dSJan Kara 895884d179dSJan Kara /* This routine is guarded by dqonoff_mutex mutex */ 896884d179dSJan Kara static void add_dquot_ref(struct super_block *sb, int type) 897884d179dSJan Kara { 898884d179dSJan Kara struct inode *inode, *old_inode = NULL; 89962af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 9000a5a9c72SJan Kara int reserved = 0; 9014c5e6c0eSJan Kara #endif 902884d179dSJan Kara 903884d179dSJan Kara spin_lock(&inode_lock); 904884d179dSJan Kara list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { 905*250df6edSDave Chinner spin_lock(&inode->i_lock); 906*250df6edSDave Chinner if ((inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW)) || 907*250df6edSDave Chinner !atomic_read(&inode->i_writecount) || 908*250df6edSDave Chinner !dqinit_needed(inode, type)) { 909*250df6edSDave Chinner spin_unlock(&inode->i_lock); 9103ae5080fSLinus Torvalds continue; 911*250df6edSDave Chinner } 91262af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 9130a5a9c72SJan Kara if (unlikely(inode_get_rsv_space(inode) > 0)) 9140a5a9c72SJan Kara reserved = 1; 9154c5e6c0eSJan Kara #endif 916884d179dSJan Kara __iget(inode); 917*250df6edSDave Chinner spin_unlock(&inode->i_lock); 918884d179dSJan Kara spin_unlock(&inode_lock); 919884d179dSJan Kara 920884d179dSJan Kara iput(old_inode); 921871a2931SChristoph Hellwig __dquot_initialize(inode, type); 922884d179dSJan Kara /* We hold a reference to 'inode' so it couldn't have been 923884d179dSJan Kara * removed from s_inodes list while we dropped the inode_lock. 924884d179dSJan Kara * We cannot iput the inode now as we can be holding the last 925884d179dSJan Kara * reference and we cannot iput it under inode_lock. So we 926884d179dSJan Kara * keep the reference and iput it later. */ 927884d179dSJan Kara old_inode = inode; 928884d179dSJan Kara spin_lock(&inode_lock); 929884d179dSJan Kara } 930884d179dSJan Kara spin_unlock(&inode_lock); 931884d179dSJan Kara iput(old_inode); 9320a5a9c72SJan Kara 93362af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 9340a5a9c72SJan Kara if (reserved) { 935fb5ffb0eSJiaying Zhang quota_error(sb, "Writes happened before quota was turned on " 936fb5ffb0eSJiaying Zhang "thus quota information is probably inconsistent. " 937fb5ffb0eSJiaying Zhang "Please run quotacheck(8)"); 9380a5a9c72SJan Kara } 9394c5e6c0eSJan Kara #endif 940884d179dSJan Kara } 941884d179dSJan Kara 942268157baSJan Kara /* 943268157baSJan Kara * Return 0 if dqput() won't block. 944268157baSJan Kara * (note that 1 doesn't necessarily mean blocking) 945268157baSJan Kara */ 946884d179dSJan Kara static inline int dqput_blocks(struct dquot *dquot) 947884d179dSJan Kara { 948884d179dSJan Kara if (atomic_read(&dquot->dq_count) <= 1) 949884d179dSJan Kara return 1; 950884d179dSJan Kara return 0; 951884d179dSJan Kara } 952884d179dSJan Kara 953268157baSJan Kara /* 954268157baSJan Kara * Remove references to dquots from inode and add dquot to list for freeing 955268157baSJan Kara * if we have the last referece to dquot 956268157baSJan Kara * We can't race with anybody because we hold dqptr_sem for writing... 957268157baSJan Kara */ 958884d179dSJan Kara static int remove_inode_dquot_ref(struct inode *inode, int type, 959884d179dSJan Kara struct list_head *tofree_head) 960884d179dSJan Kara { 961884d179dSJan Kara struct dquot *dquot = inode->i_dquot[type]; 962884d179dSJan Kara 963dd6f3c6dSJan Kara inode->i_dquot[type] = NULL; 964dd6f3c6dSJan Kara if (dquot) { 965884d179dSJan Kara if (dqput_blocks(dquot)) { 96662af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 967884d179dSJan Kara if (atomic_read(&dquot->dq_count) != 1) 968fb5ffb0eSJiaying Zhang quota_error(inode->i_sb, "Adding dquot with " 969fb5ffb0eSJiaying Zhang "dq_count %d to dispose list", 970fb5ffb0eSJiaying Zhang atomic_read(&dquot->dq_count)); 971884d179dSJan Kara #endif 972884d179dSJan Kara spin_lock(&dq_list_lock); 973268157baSJan Kara /* As dquot must have currently users it can't be on 974268157baSJan Kara * the free list... */ 975268157baSJan Kara list_add(&dquot->dq_free, tofree_head); 976884d179dSJan Kara spin_unlock(&dq_list_lock); 977884d179dSJan Kara return 1; 978884d179dSJan Kara } 979884d179dSJan Kara else 980884d179dSJan Kara dqput(dquot); /* We have guaranteed we won't block */ 981884d179dSJan Kara } 982884d179dSJan Kara return 0; 983884d179dSJan Kara } 984884d179dSJan Kara 985268157baSJan Kara /* 986268157baSJan Kara * Free list of dquots 987268157baSJan Kara * Dquots are removed from inodes and no new references can be got so we are 988268157baSJan Kara * the only ones holding reference 989268157baSJan Kara */ 990884d179dSJan Kara static void put_dquot_list(struct list_head *tofree_head) 991884d179dSJan Kara { 992884d179dSJan Kara struct list_head *act_head; 993884d179dSJan Kara struct dquot *dquot; 994884d179dSJan Kara 995884d179dSJan Kara act_head = tofree_head->next; 996884d179dSJan Kara while (act_head != tofree_head) { 997884d179dSJan Kara dquot = list_entry(act_head, struct dquot, dq_free); 998884d179dSJan Kara act_head = act_head->next; 999268157baSJan Kara /* Remove dquot from the list so we won't have problems... */ 1000268157baSJan Kara list_del_init(&dquot->dq_free); 1001884d179dSJan Kara dqput(dquot); 1002884d179dSJan Kara } 1003884d179dSJan Kara } 1004884d179dSJan Kara 1005884d179dSJan Kara static void remove_dquot_ref(struct super_block *sb, int type, 1006884d179dSJan Kara struct list_head *tofree_head) 1007884d179dSJan Kara { 1008884d179dSJan Kara struct inode *inode; 10097af9cce8SDmitry Monakhov int reserved = 0; 1010884d179dSJan Kara 1011884d179dSJan Kara spin_lock(&inode_lock); 1012884d179dSJan Kara list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { 10133ae5080fSLinus Torvalds /* 10143ae5080fSLinus Torvalds * We have to scan also I_NEW inodes because they can already 10153ae5080fSLinus Torvalds * have quota pointer initialized. Luckily, we need to touch 10163ae5080fSLinus Torvalds * only quota pointers and these have separate locking 10173ae5080fSLinus Torvalds * (dqptr_sem). 10183ae5080fSLinus Torvalds */ 10197af9cce8SDmitry Monakhov if (!IS_NOQUOTA(inode)) { 10207af9cce8SDmitry Monakhov if (unlikely(inode_get_rsv_space(inode) > 0)) 10217af9cce8SDmitry Monakhov reserved = 1; 1022884d179dSJan Kara remove_inode_dquot_ref(inode, type, tofree_head); 1023884d179dSJan Kara } 10247af9cce8SDmitry Monakhov } 1025884d179dSJan Kara spin_unlock(&inode_lock); 10267af9cce8SDmitry Monakhov #ifdef CONFIG_QUOTA_DEBUG 10277af9cce8SDmitry Monakhov if (reserved) { 10287af9cce8SDmitry Monakhov printk(KERN_WARNING "VFS (%s): Writes happened after quota" 10297af9cce8SDmitry Monakhov " was disabled thus quota information is probably " 10307af9cce8SDmitry Monakhov "inconsistent. Please run quotacheck(8).\n", sb->s_id); 10317af9cce8SDmitry Monakhov } 10327af9cce8SDmitry Monakhov #endif 1033884d179dSJan Kara } 1034884d179dSJan Kara 1035884d179dSJan Kara /* Gather all references from inodes and drop them */ 1036884d179dSJan Kara static void drop_dquot_ref(struct super_block *sb, int type) 1037884d179dSJan Kara { 1038884d179dSJan Kara LIST_HEAD(tofree_head); 1039884d179dSJan Kara 1040884d179dSJan Kara if (sb->dq_op) { 1041884d179dSJan Kara down_write(&sb_dqopt(sb)->dqptr_sem); 1042884d179dSJan Kara remove_dquot_ref(sb, type, &tofree_head); 1043884d179dSJan Kara up_write(&sb_dqopt(sb)->dqptr_sem); 1044884d179dSJan Kara put_dquot_list(&tofree_head); 1045884d179dSJan Kara } 1046884d179dSJan Kara } 1047884d179dSJan Kara 1048884d179dSJan Kara static inline void dquot_incr_inodes(struct dquot *dquot, qsize_t number) 1049884d179dSJan Kara { 1050884d179dSJan Kara dquot->dq_dqb.dqb_curinodes += number; 1051884d179dSJan Kara } 1052884d179dSJan Kara 1053884d179dSJan Kara static inline void dquot_incr_space(struct dquot *dquot, qsize_t number) 1054884d179dSJan Kara { 1055884d179dSJan Kara dquot->dq_dqb.dqb_curspace += number; 1056884d179dSJan Kara } 1057884d179dSJan Kara 1058884d179dSJan Kara static inline void dquot_resv_space(struct dquot *dquot, qsize_t number) 1059884d179dSJan Kara { 1060884d179dSJan Kara dquot->dq_dqb.dqb_rsvspace += number; 1061884d179dSJan Kara } 1062884d179dSJan Kara 1063884d179dSJan Kara /* 1064884d179dSJan Kara * Claim reserved quota space 1065884d179dSJan Kara */ 10660a5a9c72SJan Kara static void dquot_claim_reserved_space(struct dquot *dquot, qsize_t number) 1067884d179dSJan Kara { 10680a5a9c72SJan Kara if (dquot->dq_dqb.dqb_rsvspace < number) { 10690a5a9c72SJan Kara WARN_ON_ONCE(1); 10700a5a9c72SJan Kara number = dquot->dq_dqb.dqb_rsvspace; 10710a5a9c72SJan Kara } 1072884d179dSJan Kara dquot->dq_dqb.dqb_curspace += number; 1073884d179dSJan Kara dquot->dq_dqb.dqb_rsvspace -= number; 1074884d179dSJan Kara } 1075884d179dSJan Kara 1076884d179dSJan Kara static inline 1077884d179dSJan Kara void dquot_free_reserved_space(struct dquot *dquot, qsize_t number) 1078884d179dSJan Kara { 10790a5a9c72SJan Kara if (dquot->dq_dqb.dqb_rsvspace >= number) 1080884d179dSJan Kara dquot->dq_dqb.dqb_rsvspace -= number; 10810a5a9c72SJan Kara else { 10820a5a9c72SJan Kara WARN_ON_ONCE(1); 10830a5a9c72SJan Kara dquot->dq_dqb.dqb_rsvspace = 0; 10840a5a9c72SJan Kara } 1085884d179dSJan Kara } 1086884d179dSJan Kara 10877a2435d8SJan Kara static void dquot_decr_inodes(struct dquot *dquot, qsize_t number) 1088884d179dSJan Kara { 1089884d179dSJan Kara if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE || 1090884d179dSJan Kara dquot->dq_dqb.dqb_curinodes >= number) 1091884d179dSJan Kara dquot->dq_dqb.dqb_curinodes -= number; 1092884d179dSJan Kara else 1093884d179dSJan Kara dquot->dq_dqb.dqb_curinodes = 0; 1094884d179dSJan Kara if (dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit) 1095884d179dSJan Kara dquot->dq_dqb.dqb_itime = (time_t) 0; 1096884d179dSJan Kara clear_bit(DQ_INODES_B, &dquot->dq_flags); 1097884d179dSJan Kara } 1098884d179dSJan Kara 10997a2435d8SJan Kara static void dquot_decr_space(struct dquot *dquot, qsize_t number) 1100884d179dSJan Kara { 1101884d179dSJan Kara if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE || 1102884d179dSJan Kara dquot->dq_dqb.dqb_curspace >= number) 1103884d179dSJan Kara dquot->dq_dqb.dqb_curspace -= number; 1104884d179dSJan Kara else 1105884d179dSJan Kara dquot->dq_dqb.dqb_curspace = 0; 1106884d179dSJan Kara if (dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit) 1107884d179dSJan Kara dquot->dq_dqb.dqb_btime = (time_t) 0; 1108884d179dSJan Kara clear_bit(DQ_BLKS_B, &dquot->dq_flags); 1109884d179dSJan Kara } 1110884d179dSJan Kara 1111884d179dSJan Kara static int warning_issued(struct dquot *dquot, const int warntype) 1112884d179dSJan Kara { 1113884d179dSJan Kara int flag = (warntype == QUOTA_NL_BHARDWARN || 1114884d179dSJan Kara warntype == QUOTA_NL_BSOFTLONGWARN) ? DQ_BLKS_B : 1115884d179dSJan Kara ((warntype == QUOTA_NL_IHARDWARN || 1116884d179dSJan Kara warntype == QUOTA_NL_ISOFTLONGWARN) ? DQ_INODES_B : 0); 1117884d179dSJan Kara 1118884d179dSJan Kara if (!flag) 1119884d179dSJan Kara return 0; 1120884d179dSJan Kara return test_and_set_bit(flag, &dquot->dq_flags); 1121884d179dSJan Kara } 1122884d179dSJan Kara 1123884d179dSJan Kara #ifdef CONFIG_PRINT_QUOTA_WARNING 1124884d179dSJan Kara static int flag_print_warnings = 1; 1125884d179dSJan Kara 11267a2435d8SJan Kara static int need_print_warning(struct dquot *dquot) 1127884d179dSJan Kara { 1128884d179dSJan Kara if (!flag_print_warnings) 1129884d179dSJan Kara return 0; 1130884d179dSJan Kara 1131884d179dSJan Kara switch (dquot->dq_type) { 1132884d179dSJan Kara case USRQUOTA: 1133884d179dSJan Kara return current_fsuid() == dquot->dq_id; 1134884d179dSJan Kara case GRPQUOTA: 1135884d179dSJan Kara return in_group_p(dquot->dq_id); 1136884d179dSJan Kara } 1137884d179dSJan Kara return 0; 1138884d179dSJan Kara } 1139884d179dSJan Kara 1140884d179dSJan Kara /* Print warning to user which exceeded quota */ 1141884d179dSJan Kara static void print_warning(struct dquot *dquot, const int warntype) 1142884d179dSJan Kara { 1143884d179dSJan Kara char *msg = NULL; 1144884d179dSJan Kara struct tty_struct *tty; 1145884d179dSJan Kara 1146884d179dSJan Kara if (warntype == QUOTA_NL_IHARDBELOW || 1147884d179dSJan Kara warntype == QUOTA_NL_ISOFTBELOW || 1148884d179dSJan Kara warntype == QUOTA_NL_BHARDBELOW || 1149884d179dSJan Kara warntype == QUOTA_NL_BSOFTBELOW || !need_print_warning(dquot)) 1150884d179dSJan Kara return; 1151884d179dSJan Kara 1152884d179dSJan Kara tty = get_current_tty(); 1153884d179dSJan Kara if (!tty) 1154884d179dSJan Kara return; 1155884d179dSJan Kara tty_write_message(tty, dquot->dq_sb->s_id); 1156884d179dSJan Kara if (warntype == QUOTA_NL_ISOFTWARN || warntype == QUOTA_NL_BSOFTWARN) 1157884d179dSJan Kara tty_write_message(tty, ": warning, "); 1158884d179dSJan Kara else 1159884d179dSJan Kara tty_write_message(tty, ": write failed, "); 1160884d179dSJan Kara tty_write_message(tty, quotatypes[dquot->dq_type]); 1161884d179dSJan Kara switch (warntype) { 1162884d179dSJan Kara case QUOTA_NL_IHARDWARN: 1163884d179dSJan Kara msg = " file limit reached.\r\n"; 1164884d179dSJan Kara break; 1165884d179dSJan Kara case QUOTA_NL_ISOFTLONGWARN: 1166884d179dSJan Kara msg = " file quota exceeded too long.\r\n"; 1167884d179dSJan Kara break; 1168884d179dSJan Kara case QUOTA_NL_ISOFTWARN: 1169884d179dSJan Kara msg = " file quota exceeded.\r\n"; 1170884d179dSJan Kara break; 1171884d179dSJan Kara case QUOTA_NL_BHARDWARN: 1172884d179dSJan Kara msg = " block limit reached.\r\n"; 1173884d179dSJan Kara break; 1174884d179dSJan Kara case QUOTA_NL_BSOFTLONGWARN: 1175884d179dSJan Kara msg = " block quota exceeded too long.\r\n"; 1176884d179dSJan Kara break; 1177884d179dSJan Kara case QUOTA_NL_BSOFTWARN: 1178884d179dSJan Kara msg = " block quota exceeded.\r\n"; 1179884d179dSJan Kara break; 1180884d179dSJan Kara } 1181884d179dSJan Kara tty_write_message(tty, msg); 1182884d179dSJan Kara tty_kref_put(tty); 1183884d179dSJan Kara } 1184884d179dSJan Kara #endif 1185884d179dSJan Kara 1186884d179dSJan Kara /* 1187884d179dSJan Kara * Write warnings to the console and send warning messages over netlink. 1188884d179dSJan Kara * 1189884d179dSJan Kara * Note that this function can sleep. 1190884d179dSJan Kara */ 11917a2435d8SJan Kara static void flush_warnings(struct dquot *const *dquots, char *warntype) 1192884d179dSJan Kara { 119386e931a3SSteven Whitehouse struct dquot *dq; 1194884d179dSJan Kara int i; 1195884d179dSJan Kara 119686e931a3SSteven Whitehouse for (i = 0; i < MAXQUOTAS; i++) { 119786e931a3SSteven Whitehouse dq = dquots[i]; 119886e931a3SSteven Whitehouse if (dq && warntype[i] != QUOTA_NL_NOWARN && 119986e931a3SSteven Whitehouse !warning_issued(dq, warntype[i])) { 1200884d179dSJan Kara #ifdef CONFIG_PRINT_QUOTA_WARNING 120186e931a3SSteven Whitehouse print_warning(dq, warntype[i]); 1202884d179dSJan Kara #endif 120386e931a3SSteven Whitehouse quota_send_warning(dq->dq_type, dq->dq_id, 120486e931a3SSteven Whitehouse dq->dq_sb->s_dev, warntype[i]); 120586e931a3SSteven Whitehouse } 1206884d179dSJan Kara } 1207884d179dSJan Kara } 1208884d179dSJan Kara 12097a2435d8SJan Kara static int ignore_hardlimit(struct dquot *dquot) 1210884d179dSJan Kara { 1211884d179dSJan Kara struct mem_dqinfo *info = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_type]; 1212884d179dSJan Kara 1213884d179dSJan Kara return capable(CAP_SYS_RESOURCE) && 1214268157baSJan Kara (info->dqi_format->qf_fmt_id != QFMT_VFS_OLD || 1215268157baSJan Kara !(info->dqi_flags & V1_DQF_RSQUASH)); 1216884d179dSJan Kara } 1217884d179dSJan Kara 1218884d179dSJan Kara /* needs dq_data_lock */ 1219884d179dSJan Kara static int check_idq(struct dquot *dquot, qsize_t inodes, char *warntype) 1220884d179dSJan Kara { 1221268157baSJan Kara qsize_t newinodes = dquot->dq_dqb.dqb_curinodes + inodes; 1222268157baSJan Kara 1223884d179dSJan Kara *warntype = QUOTA_NL_NOWARN; 1224884d179dSJan Kara if (!sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_type) || 1225884d179dSJan Kara test_bit(DQ_FAKE_B, &dquot->dq_flags)) 1226efd8f0e6SChristoph Hellwig return 0; 1227884d179dSJan Kara 1228884d179dSJan Kara if (dquot->dq_dqb.dqb_ihardlimit && 1229268157baSJan Kara newinodes > dquot->dq_dqb.dqb_ihardlimit && 1230884d179dSJan Kara !ignore_hardlimit(dquot)) { 1231884d179dSJan Kara *warntype = QUOTA_NL_IHARDWARN; 1232efd8f0e6SChristoph Hellwig return -EDQUOT; 1233884d179dSJan Kara } 1234884d179dSJan Kara 1235884d179dSJan Kara if (dquot->dq_dqb.dqb_isoftlimit && 1236268157baSJan Kara newinodes > dquot->dq_dqb.dqb_isoftlimit && 1237268157baSJan Kara dquot->dq_dqb.dqb_itime && 1238268157baSJan Kara get_seconds() >= dquot->dq_dqb.dqb_itime && 1239884d179dSJan Kara !ignore_hardlimit(dquot)) { 1240884d179dSJan Kara *warntype = QUOTA_NL_ISOFTLONGWARN; 1241efd8f0e6SChristoph Hellwig return -EDQUOT; 1242884d179dSJan Kara } 1243884d179dSJan Kara 1244884d179dSJan Kara if (dquot->dq_dqb.dqb_isoftlimit && 1245268157baSJan Kara newinodes > dquot->dq_dqb.dqb_isoftlimit && 1246884d179dSJan Kara dquot->dq_dqb.dqb_itime == 0) { 1247884d179dSJan Kara *warntype = QUOTA_NL_ISOFTWARN; 1248268157baSJan Kara dquot->dq_dqb.dqb_itime = get_seconds() + 1249268157baSJan Kara sb_dqopt(dquot->dq_sb)->info[dquot->dq_type].dqi_igrace; 1250884d179dSJan Kara } 1251884d179dSJan Kara 1252efd8f0e6SChristoph Hellwig return 0; 1253884d179dSJan Kara } 1254884d179dSJan Kara 1255884d179dSJan Kara /* needs dq_data_lock */ 1256884d179dSJan Kara static int check_bdq(struct dquot *dquot, qsize_t space, int prealloc, char *warntype) 1257884d179dSJan Kara { 1258884d179dSJan Kara qsize_t tspace; 1259268157baSJan Kara struct super_block *sb = dquot->dq_sb; 1260884d179dSJan Kara 1261884d179dSJan Kara *warntype = QUOTA_NL_NOWARN; 1262268157baSJan Kara if (!sb_has_quota_limits_enabled(sb, dquot->dq_type) || 1263884d179dSJan Kara test_bit(DQ_FAKE_B, &dquot->dq_flags)) 1264efd8f0e6SChristoph Hellwig return 0; 1265884d179dSJan Kara 1266884d179dSJan Kara tspace = dquot->dq_dqb.dqb_curspace + dquot->dq_dqb.dqb_rsvspace 1267884d179dSJan Kara + space; 1268884d179dSJan Kara 1269884d179dSJan Kara if (dquot->dq_dqb.dqb_bhardlimit && 1270884d179dSJan Kara tspace > dquot->dq_dqb.dqb_bhardlimit && 1271884d179dSJan Kara !ignore_hardlimit(dquot)) { 1272884d179dSJan Kara if (!prealloc) 1273884d179dSJan Kara *warntype = QUOTA_NL_BHARDWARN; 1274efd8f0e6SChristoph Hellwig return -EDQUOT; 1275884d179dSJan Kara } 1276884d179dSJan Kara 1277884d179dSJan Kara if (dquot->dq_dqb.dqb_bsoftlimit && 1278884d179dSJan Kara tspace > dquot->dq_dqb.dqb_bsoftlimit && 1279268157baSJan Kara dquot->dq_dqb.dqb_btime && 1280268157baSJan Kara get_seconds() >= dquot->dq_dqb.dqb_btime && 1281884d179dSJan Kara !ignore_hardlimit(dquot)) { 1282884d179dSJan Kara if (!prealloc) 1283884d179dSJan Kara *warntype = QUOTA_NL_BSOFTLONGWARN; 1284efd8f0e6SChristoph Hellwig return -EDQUOT; 1285884d179dSJan Kara } 1286884d179dSJan Kara 1287884d179dSJan Kara if (dquot->dq_dqb.dqb_bsoftlimit && 1288884d179dSJan Kara tspace > dquot->dq_dqb.dqb_bsoftlimit && 1289884d179dSJan Kara dquot->dq_dqb.dqb_btime == 0) { 1290884d179dSJan Kara if (!prealloc) { 1291884d179dSJan Kara *warntype = QUOTA_NL_BSOFTWARN; 1292268157baSJan Kara dquot->dq_dqb.dqb_btime = get_seconds() + 1293268157baSJan Kara sb_dqopt(sb)->info[dquot->dq_type].dqi_bgrace; 1294884d179dSJan Kara } 1295884d179dSJan Kara else 1296884d179dSJan Kara /* 1297884d179dSJan Kara * We don't allow preallocation to exceed softlimit so exceeding will 1298884d179dSJan Kara * be always printed 1299884d179dSJan Kara */ 1300efd8f0e6SChristoph Hellwig return -EDQUOT; 1301884d179dSJan Kara } 1302884d179dSJan Kara 1303efd8f0e6SChristoph Hellwig return 0; 1304884d179dSJan Kara } 1305884d179dSJan Kara 1306884d179dSJan Kara static int info_idq_free(struct dquot *dquot, qsize_t inodes) 1307884d179dSJan Kara { 1308268157baSJan Kara qsize_t newinodes; 1309268157baSJan Kara 1310884d179dSJan Kara if (test_bit(DQ_FAKE_B, &dquot->dq_flags) || 1311884d179dSJan Kara dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit || 1312884d179dSJan Kara !sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_type)) 1313884d179dSJan Kara return QUOTA_NL_NOWARN; 1314884d179dSJan Kara 1315268157baSJan Kara newinodes = dquot->dq_dqb.dqb_curinodes - inodes; 1316268157baSJan Kara if (newinodes <= dquot->dq_dqb.dqb_isoftlimit) 1317884d179dSJan Kara return QUOTA_NL_ISOFTBELOW; 1318884d179dSJan Kara if (dquot->dq_dqb.dqb_curinodes >= dquot->dq_dqb.dqb_ihardlimit && 1319268157baSJan Kara newinodes < dquot->dq_dqb.dqb_ihardlimit) 1320884d179dSJan Kara return QUOTA_NL_IHARDBELOW; 1321884d179dSJan Kara return QUOTA_NL_NOWARN; 1322884d179dSJan Kara } 1323884d179dSJan Kara 1324884d179dSJan Kara static int info_bdq_free(struct dquot *dquot, qsize_t space) 1325884d179dSJan Kara { 1326884d179dSJan Kara if (test_bit(DQ_FAKE_B, &dquot->dq_flags) || 1327884d179dSJan Kara dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit) 1328884d179dSJan Kara return QUOTA_NL_NOWARN; 1329884d179dSJan Kara 1330884d179dSJan Kara if (dquot->dq_dqb.dqb_curspace - space <= dquot->dq_dqb.dqb_bsoftlimit) 1331884d179dSJan Kara return QUOTA_NL_BSOFTBELOW; 1332884d179dSJan Kara if (dquot->dq_dqb.dqb_curspace >= dquot->dq_dqb.dqb_bhardlimit && 1333884d179dSJan Kara dquot->dq_dqb.dqb_curspace - space < dquot->dq_dqb.dqb_bhardlimit) 1334884d179dSJan Kara return QUOTA_NL_BHARDBELOW; 1335884d179dSJan Kara return QUOTA_NL_NOWARN; 1336884d179dSJan Kara } 13370a5a9c72SJan Kara 1338189eef59SChristoph Hellwig static int dquot_active(const struct inode *inode) 1339189eef59SChristoph Hellwig { 1340189eef59SChristoph Hellwig struct super_block *sb = inode->i_sb; 1341189eef59SChristoph Hellwig 1342189eef59SChristoph Hellwig if (IS_NOQUOTA(inode)) 1343189eef59SChristoph Hellwig return 0; 1344189eef59SChristoph Hellwig return sb_any_quota_loaded(sb) & ~sb_any_quota_suspended(sb); 1345189eef59SChristoph Hellwig } 1346189eef59SChristoph Hellwig 1347884d179dSJan Kara /* 1348884d179dSJan Kara * Initialize quota pointers in inode 1349871a2931SChristoph Hellwig * 1350884d179dSJan Kara * We do things in a bit complicated way but by that we avoid calling 1351884d179dSJan Kara * dqget() and thus filesystem callbacks under dqptr_sem. 1352871a2931SChristoph Hellwig * 1353871a2931SChristoph Hellwig * It is better to call this function outside of any transaction as it 1354871a2931SChristoph Hellwig * might need a lot of space in journal for dquot structure allocation. 1355884d179dSJan Kara */ 1356871a2931SChristoph Hellwig static void __dquot_initialize(struct inode *inode, int type) 1357884d179dSJan Kara { 1358884d179dSJan Kara unsigned int id = 0; 1359871a2931SChristoph Hellwig int cnt; 1360ad1e6e8dSDmitry Monakhov struct dquot *got[MAXQUOTAS]; 1361884d179dSJan Kara struct super_block *sb = inode->i_sb; 13620a5a9c72SJan Kara qsize_t rsv; 1363884d179dSJan Kara 1364884d179dSJan Kara /* First test before acquiring mutex - solves deadlocks when we 1365884d179dSJan Kara * re-enter the quota code and are already holding the mutex */ 1366189eef59SChristoph Hellwig if (!dquot_active(inode)) 1367871a2931SChristoph Hellwig return; 1368884d179dSJan Kara 1369884d179dSJan Kara /* First get references to structures we might need. */ 1370884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1371ad1e6e8dSDmitry Monakhov got[cnt] = NULL; 1372884d179dSJan Kara if (type != -1 && cnt != type) 1373884d179dSJan Kara continue; 1374884d179dSJan Kara switch (cnt) { 1375884d179dSJan Kara case USRQUOTA: 1376884d179dSJan Kara id = inode->i_uid; 1377884d179dSJan Kara break; 1378884d179dSJan Kara case GRPQUOTA: 1379884d179dSJan Kara id = inode->i_gid; 1380884d179dSJan Kara break; 1381884d179dSJan Kara } 1382884d179dSJan Kara got[cnt] = dqget(sb, id, cnt); 1383884d179dSJan Kara } 1384884d179dSJan Kara 1385884d179dSJan Kara down_write(&sb_dqopt(sb)->dqptr_sem); 1386884d179dSJan Kara if (IS_NOQUOTA(inode)) 1387884d179dSJan Kara goto out_err; 1388884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1389884d179dSJan Kara if (type != -1 && cnt != type) 1390884d179dSJan Kara continue; 1391884d179dSJan Kara /* Avoid races with quotaoff() */ 1392884d179dSJan Kara if (!sb_has_quota_active(sb, cnt)) 1393884d179dSJan Kara continue; 13944408ea41SJan Kara /* We could race with quotaon or dqget() could have failed */ 13954408ea41SJan Kara if (!got[cnt]) 13964408ea41SJan Kara continue; 1397dd6f3c6dSJan Kara if (!inode->i_dquot[cnt]) { 1398884d179dSJan Kara inode->i_dquot[cnt] = got[cnt]; 1399dd6f3c6dSJan Kara got[cnt] = NULL; 14000a5a9c72SJan Kara /* 14010a5a9c72SJan Kara * Make quota reservation system happy if someone 14020a5a9c72SJan Kara * did a write before quota was turned on 14030a5a9c72SJan Kara */ 14040a5a9c72SJan Kara rsv = inode_get_rsv_space(inode); 14050a5a9c72SJan Kara if (unlikely(rsv)) 14060a5a9c72SJan Kara dquot_resv_space(inode->i_dquot[cnt], rsv); 1407884d179dSJan Kara } 1408884d179dSJan Kara } 1409884d179dSJan Kara out_err: 1410884d179dSJan Kara up_write(&sb_dqopt(sb)->dqptr_sem); 1411884d179dSJan Kara /* Drop unused references */ 1412dc52dd3aSDmitry Monakhov dqput_all(got); 1413871a2931SChristoph Hellwig } 1414871a2931SChristoph Hellwig 1415871a2931SChristoph Hellwig void dquot_initialize(struct inode *inode) 1416871a2931SChristoph Hellwig { 1417871a2931SChristoph Hellwig __dquot_initialize(inode, -1); 1418884d179dSJan Kara } 1419884d179dSJan Kara EXPORT_SYMBOL(dquot_initialize); 1420884d179dSJan Kara 1421884d179dSJan Kara /* 1422884d179dSJan Kara * Release all quotas referenced by inode 1423884d179dSJan Kara */ 14249f754758SChristoph Hellwig static void __dquot_drop(struct inode *inode) 1425884d179dSJan Kara { 1426884d179dSJan Kara int cnt; 1427884d179dSJan Kara struct dquot *put[MAXQUOTAS]; 1428884d179dSJan Kara 1429884d179dSJan Kara down_write(&sb_dqopt(inode->i_sb)->dqptr_sem); 1430884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1431884d179dSJan Kara put[cnt] = inode->i_dquot[cnt]; 1432dd6f3c6dSJan Kara inode->i_dquot[cnt] = NULL; 1433884d179dSJan Kara } 1434884d179dSJan Kara up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); 1435dc52dd3aSDmitry Monakhov dqput_all(put); 1436884d179dSJan Kara } 1437884d179dSJan Kara 14389f754758SChristoph Hellwig void dquot_drop(struct inode *inode) 1439884d179dSJan Kara { 1440884d179dSJan Kara int cnt; 14419f754758SChristoph Hellwig 14429f754758SChristoph Hellwig if (IS_NOQUOTA(inode)) 14439f754758SChristoph Hellwig return; 14449f754758SChristoph Hellwig 14459f754758SChristoph Hellwig /* 14469f754758SChristoph Hellwig * Test before calling to rule out calls from proc and such 1447884d179dSJan Kara * where we are not allowed to block. Note that this is 1448884d179dSJan Kara * actually reliable test even without the lock - the caller 1449884d179dSJan Kara * must assure that nobody can come after the DQUOT_DROP and 14509f754758SChristoph Hellwig * add quota pointers back anyway. 14519f754758SChristoph Hellwig */ 14529f754758SChristoph Hellwig for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1453dd6f3c6dSJan Kara if (inode->i_dquot[cnt]) 1454884d179dSJan Kara break; 14559f754758SChristoph Hellwig } 14569f754758SChristoph Hellwig 1457884d179dSJan Kara if (cnt < MAXQUOTAS) 14589f754758SChristoph Hellwig __dquot_drop(inode); 1459884d179dSJan Kara } 14609f754758SChristoph Hellwig EXPORT_SYMBOL(dquot_drop); 1461884d179dSJan Kara 1462884d179dSJan Kara /* 1463fd8fbfc1SDmitry Monakhov * inode_reserved_space is managed internally by quota, and protected by 1464fd8fbfc1SDmitry Monakhov * i_lock similar to i_blocks+i_bytes. 1465fd8fbfc1SDmitry Monakhov */ 1466fd8fbfc1SDmitry Monakhov static qsize_t *inode_reserved_space(struct inode * inode) 1467fd8fbfc1SDmitry Monakhov { 1468fd8fbfc1SDmitry Monakhov /* Filesystem must explicitly define it's own method in order to use 1469fd8fbfc1SDmitry Monakhov * quota reservation interface */ 1470fd8fbfc1SDmitry Monakhov BUG_ON(!inode->i_sb->dq_op->get_reserved_space); 1471fd8fbfc1SDmitry Monakhov return inode->i_sb->dq_op->get_reserved_space(inode); 1472fd8fbfc1SDmitry Monakhov } 1473fd8fbfc1SDmitry Monakhov 1474c469070aSDmitry Monakhov void inode_add_rsv_space(struct inode *inode, qsize_t number) 1475fd8fbfc1SDmitry Monakhov { 1476fd8fbfc1SDmitry Monakhov spin_lock(&inode->i_lock); 1477fd8fbfc1SDmitry Monakhov *inode_reserved_space(inode) += number; 1478fd8fbfc1SDmitry Monakhov spin_unlock(&inode->i_lock); 1479fd8fbfc1SDmitry Monakhov } 1480c469070aSDmitry Monakhov EXPORT_SYMBOL(inode_add_rsv_space); 1481fd8fbfc1SDmitry Monakhov 1482c469070aSDmitry Monakhov void inode_claim_rsv_space(struct inode *inode, qsize_t number) 1483fd8fbfc1SDmitry Monakhov { 1484fd8fbfc1SDmitry Monakhov spin_lock(&inode->i_lock); 1485fd8fbfc1SDmitry Monakhov *inode_reserved_space(inode) -= number; 1486fd8fbfc1SDmitry Monakhov __inode_add_bytes(inode, number); 1487fd8fbfc1SDmitry Monakhov spin_unlock(&inode->i_lock); 1488fd8fbfc1SDmitry Monakhov } 1489c469070aSDmitry Monakhov EXPORT_SYMBOL(inode_claim_rsv_space); 1490fd8fbfc1SDmitry Monakhov 1491c469070aSDmitry Monakhov void inode_sub_rsv_space(struct inode *inode, qsize_t number) 1492fd8fbfc1SDmitry Monakhov { 1493fd8fbfc1SDmitry Monakhov spin_lock(&inode->i_lock); 1494fd8fbfc1SDmitry Monakhov *inode_reserved_space(inode) -= number; 1495fd8fbfc1SDmitry Monakhov spin_unlock(&inode->i_lock); 1496fd8fbfc1SDmitry Monakhov } 1497c469070aSDmitry Monakhov EXPORT_SYMBOL(inode_sub_rsv_space); 1498fd8fbfc1SDmitry Monakhov 1499fd8fbfc1SDmitry Monakhov static qsize_t inode_get_rsv_space(struct inode *inode) 1500fd8fbfc1SDmitry Monakhov { 1501fd8fbfc1SDmitry Monakhov qsize_t ret; 150205b5d898SJan Kara 150305b5d898SJan Kara if (!inode->i_sb->dq_op->get_reserved_space) 150405b5d898SJan Kara return 0; 1505fd8fbfc1SDmitry Monakhov spin_lock(&inode->i_lock); 1506fd8fbfc1SDmitry Monakhov ret = *inode_reserved_space(inode); 1507fd8fbfc1SDmitry Monakhov spin_unlock(&inode->i_lock); 1508fd8fbfc1SDmitry Monakhov return ret; 1509fd8fbfc1SDmitry Monakhov } 1510fd8fbfc1SDmitry Monakhov 1511fd8fbfc1SDmitry Monakhov static void inode_incr_space(struct inode *inode, qsize_t number, 1512fd8fbfc1SDmitry Monakhov int reserve) 1513fd8fbfc1SDmitry Monakhov { 1514fd8fbfc1SDmitry Monakhov if (reserve) 1515fd8fbfc1SDmitry Monakhov inode_add_rsv_space(inode, number); 1516fd8fbfc1SDmitry Monakhov else 1517fd8fbfc1SDmitry Monakhov inode_add_bytes(inode, number); 1518fd8fbfc1SDmitry Monakhov } 1519fd8fbfc1SDmitry Monakhov 1520fd8fbfc1SDmitry Monakhov static void inode_decr_space(struct inode *inode, qsize_t number, int reserve) 1521fd8fbfc1SDmitry Monakhov { 1522fd8fbfc1SDmitry Monakhov if (reserve) 1523fd8fbfc1SDmitry Monakhov inode_sub_rsv_space(inode, number); 1524fd8fbfc1SDmitry Monakhov else 1525fd8fbfc1SDmitry Monakhov inode_sub_bytes(inode, number); 1526fd8fbfc1SDmitry Monakhov } 1527fd8fbfc1SDmitry Monakhov 1528fd8fbfc1SDmitry Monakhov /* 15295dd4056dSChristoph Hellwig * This functions updates i_blocks+i_bytes fields and quota information 15305dd4056dSChristoph Hellwig * (together with appropriate checks). 15315dd4056dSChristoph Hellwig * 15325dd4056dSChristoph Hellwig * NOTE: We absolutely rely on the fact that caller dirties the inode 15335dd4056dSChristoph Hellwig * (usually helpers in quotaops.h care about this) and holds a handle for 15345dd4056dSChristoph Hellwig * the current transaction so that dquot write and inode write go into the 15355dd4056dSChristoph Hellwig * same transaction. 1536884d179dSJan Kara */ 1537884d179dSJan Kara 1538884d179dSJan Kara /* 1539884d179dSJan Kara * This operation can block, but only after everything is updated 1540884d179dSJan Kara */ 154156246f9aSEric Sandeen int __dquot_alloc_space(struct inode *inode, qsize_t number, int flags) 1542884d179dSJan Kara { 15435dd4056dSChristoph Hellwig int cnt, ret = 0; 1544884d179dSJan Kara char warntype[MAXQUOTAS]; 154556246f9aSEric Sandeen int warn = flags & DQUOT_SPACE_WARN; 154656246f9aSEric Sandeen int reserve = flags & DQUOT_SPACE_RESERVE; 15470e05842bSEric Sandeen int nofail = flags & DQUOT_SPACE_NOFAIL; 1548884d179dSJan Kara 1549fd8fbfc1SDmitry Monakhov /* 1550fd8fbfc1SDmitry Monakhov * First test before acquiring mutex - solves deadlocks when we 1551fd8fbfc1SDmitry Monakhov * re-enter the quota code and are already holding the mutex 1552fd8fbfc1SDmitry Monakhov */ 1553189eef59SChristoph Hellwig if (!dquot_active(inode)) { 1554fd8fbfc1SDmitry Monakhov inode_incr_space(inode, number, reserve); 1555fd8fbfc1SDmitry Monakhov goto out; 1556fd8fbfc1SDmitry Monakhov } 1557fd8fbfc1SDmitry Monakhov 1558fd8fbfc1SDmitry Monakhov down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1559884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 1560884d179dSJan Kara warntype[cnt] = QUOTA_NL_NOWARN; 1561884d179dSJan Kara 1562884d179dSJan Kara spin_lock(&dq_data_lock); 1563884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1564dd6f3c6dSJan Kara if (!inode->i_dquot[cnt]) 1565884d179dSJan Kara continue; 1566efd8f0e6SChristoph Hellwig ret = check_bdq(inode->i_dquot[cnt], number, !warn, 1567efd8f0e6SChristoph Hellwig warntype+cnt); 15680e05842bSEric Sandeen if (ret && !nofail) { 1569fd8fbfc1SDmitry Monakhov spin_unlock(&dq_data_lock); 1570fd8fbfc1SDmitry Monakhov goto out_flush_warn; 1571884d179dSJan Kara } 1572884d179dSJan Kara } 1573884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1574dd6f3c6dSJan Kara if (!inode->i_dquot[cnt]) 1575884d179dSJan Kara continue; 1576884d179dSJan Kara if (reserve) 1577884d179dSJan Kara dquot_resv_space(inode->i_dquot[cnt], number); 1578884d179dSJan Kara else 1579884d179dSJan Kara dquot_incr_space(inode->i_dquot[cnt], number); 1580884d179dSJan Kara } 1581fd8fbfc1SDmitry Monakhov inode_incr_space(inode, number, reserve); 1582884d179dSJan Kara spin_unlock(&dq_data_lock); 1583fd8fbfc1SDmitry Monakhov 1584fd8fbfc1SDmitry Monakhov if (reserve) 1585fd8fbfc1SDmitry Monakhov goto out_flush_warn; 1586dc52dd3aSDmitry Monakhov mark_all_dquot_dirty(inode->i_dquot); 1587fd8fbfc1SDmitry Monakhov out_flush_warn: 1588884d179dSJan Kara flush_warnings(inode->i_dquot, warntype); 1589fd8fbfc1SDmitry Monakhov up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1590fd8fbfc1SDmitry Monakhov out: 1591884d179dSJan Kara return ret; 1592884d179dSJan Kara } 15935dd4056dSChristoph Hellwig EXPORT_SYMBOL(__dquot_alloc_space); 1594884d179dSJan Kara 1595884d179dSJan Kara /* 1596884d179dSJan Kara * This operation can block, but only after everything is updated 1597884d179dSJan Kara */ 159863936ddaSChristoph Hellwig int dquot_alloc_inode(const struct inode *inode) 1599884d179dSJan Kara { 1600efd8f0e6SChristoph Hellwig int cnt, ret = 0; 1601884d179dSJan Kara char warntype[MAXQUOTAS]; 1602884d179dSJan Kara 1603884d179dSJan Kara /* First test before acquiring mutex - solves deadlocks when we 1604884d179dSJan Kara * re-enter the quota code and are already holding the mutex */ 1605189eef59SChristoph Hellwig if (!dquot_active(inode)) 160663936ddaSChristoph Hellwig return 0; 1607884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 1608884d179dSJan Kara warntype[cnt] = QUOTA_NL_NOWARN; 1609884d179dSJan Kara down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1610884d179dSJan Kara spin_lock(&dq_data_lock); 1611884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1612dd6f3c6dSJan Kara if (!inode->i_dquot[cnt]) 1613884d179dSJan Kara continue; 1614efd8f0e6SChristoph Hellwig ret = check_idq(inode->i_dquot[cnt], 1, warntype + cnt); 1615efd8f0e6SChristoph Hellwig if (ret) 1616884d179dSJan Kara goto warn_put_all; 1617884d179dSJan Kara } 1618884d179dSJan Kara 1619884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1620dd6f3c6dSJan Kara if (!inode->i_dquot[cnt]) 1621884d179dSJan Kara continue; 162263936ddaSChristoph Hellwig dquot_incr_inodes(inode->i_dquot[cnt], 1); 1623884d179dSJan Kara } 1624efd8f0e6SChristoph Hellwig 1625884d179dSJan Kara warn_put_all: 1626884d179dSJan Kara spin_unlock(&dq_data_lock); 162763936ddaSChristoph Hellwig if (ret == 0) 1628dc52dd3aSDmitry Monakhov mark_all_dquot_dirty(inode->i_dquot); 1629884d179dSJan Kara flush_warnings(inode->i_dquot, warntype); 1630884d179dSJan Kara up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1631884d179dSJan Kara return ret; 1632884d179dSJan Kara } 1633884d179dSJan Kara EXPORT_SYMBOL(dquot_alloc_inode); 1634884d179dSJan Kara 16355dd4056dSChristoph Hellwig /* 16365dd4056dSChristoph Hellwig * Convert in-memory reserved quotas to real consumed quotas 16375dd4056dSChristoph Hellwig */ 16385dd4056dSChristoph Hellwig int dquot_claim_space_nodirty(struct inode *inode, qsize_t number) 1639884d179dSJan Kara { 1640884d179dSJan Kara int cnt; 1641884d179dSJan Kara 1642189eef59SChristoph Hellwig if (!dquot_active(inode)) { 1643fd8fbfc1SDmitry Monakhov inode_claim_rsv_space(inode, number); 16445dd4056dSChristoph Hellwig return 0; 1645884d179dSJan Kara } 1646884d179dSJan Kara 1647884d179dSJan Kara down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1648884d179dSJan Kara spin_lock(&dq_data_lock); 1649884d179dSJan Kara /* Claim reserved quotas to allocated quotas */ 1650884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1651dd6f3c6dSJan Kara if (inode->i_dquot[cnt]) 1652884d179dSJan Kara dquot_claim_reserved_space(inode->i_dquot[cnt], 1653884d179dSJan Kara number); 1654884d179dSJan Kara } 1655884d179dSJan Kara /* Update inode bytes */ 1656fd8fbfc1SDmitry Monakhov inode_claim_rsv_space(inode, number); 1657884d179dSJan Kara spin_unlock(&dq_data_lock); 1658dc52dd3aSDmitry Monakhov mark_all_dquot_dirty(inode->i_dquot); 1659884d179dSJan Kara up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 16605dd4056dSChristoph Hellwig return 0; 1661884d179dSJan Kara } 16625dd4056dSChristoph Hellwig EXPORT_SYMBOL(dquot_claim_space_nodirty); 1663884d179dSJan Kara 1664884d179dSJan Kara /* 1665884d179dSJan Kara * This operation can block, but only after everything is updated 1666884d179dSJan Kara */ 166756246f9aSEric Sandeen void __dquot_free_space(struct inode *inode, qsize_t number, int flags) 1668884d179dSJan Kara { 1669884d179dSJan Kara unsigned int cnt; 1670884d179dSJan Kara char warntype[MAXQUOTAS]; 167156246f9aSEric Sandeen int reserve = flags & DQUOT_SPACE_RESERVE; 1672884d179dSJan Kara 1673884d179dSJan Kara /* First test before acquiring mutex - solves deadlocks when we 1674884d179dSJan Kara * re-enter the quota code and are already holding the mutex */ 1675189eef59SChristoph Hellwig if (!dquot_active(inode)) { 1676fd8fbfc1SDmitry Monakhov inode_decr_space(inode, number, reserve); 16775dd4056dSChristoph Hellwig return; 1678884d179dSJan Kara } 1679884d179dSJan Kara 1680884d179dSJan Kara down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1681884d179dSJan Kara spin_lock(&dq_data_lock); 1682884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1683dd6f3c6dSJan Kara if (!inode->i_dquot[cnt]) 1684884d179dSJan Kara continue; 1685884d179dSJan Kara warntype[cnt] = info_bdq_free(inode->i_dquot[cnt], number); 1686fd8fbfc1SDmitry Monakhov if (reserve) 1687fd8fbfc1SDmitry Monakhov dquot_free_reserved_space(inode->i_dquot[cnt], number); 1688fd8fbfc1SDmitry Monakhov else 1689884d179dSJan Kara dquot_decr_space(inode->i_dquot[cnt], number); 1690884d179dSJan Kara } 1691fd8fbfc1SDmitry Monakhov inode_decr_space(inode, number, reserve); 1692884d179dSJan Kara spin_unlock(&dq_data_lock); 1693fd8fbfc1SDmitry Monakhov 1694fd8fbfc1SDmitry Monakhov if (reserve) 1695fd8fbfc1SDmitry Monakhov goto out_unlock; 1696dc52dd3aSDmitry Monakhov mark_all_dquot_dirty(inode->i_dquot); 1697fd8fbfc1SDmitry Monakhov out_unlock: 1698884d179dSJan Kara flush_warnings(inode->i_dquot, warntype); 1699884d179dSJan Kara up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1700884d179dSJan Kara } 17015dd4056dSChristoph Hellwig EXPORT_SYMBOL(__dquot_free_space); 1702fd8fbfc1SDmitry Monakhov 1703fd8fbfc1SDmitry Monakhov /* 1704884d179dSJan Kara * This operation can block, but only after everything is updated 1705884d179dSJan Kara */ 170663936ddaSChristoph Hellwig void dquot_free_inode(const struct inode *inode) 1707884d179dSJan Kara { 1708884d179dSJan Kara unsigned int cnt; 1709884d179dSJan Kara char warntype[MAXQUOTAS]; 1710884d179dSJan Kara 1711884d179dSJan Kara /* First test before acquiring mutex - solves deadlocks when we 1712884d179dSJan Kara * re-enter the quota code and are already holding the mutex */ 1713189eef59SChristoph Hellwig if (!dquot_active(inode)) 171463936ddaSChristoph Hellwig return; 1715884d179dSJan Kara 1716884d179dSJan Kara down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1717884d179dSJan Kara spin_lock(&dq_data_lock); 1718884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1719dd6f3c6dSJan Kara if (!inode->i_dquot[cnt]) 1720884d179dSJan Kara continue; 172163936ddaSChristoph Hellwig warntype[cnt] = info_idq_free(inode->i_dquot[cnt], 1); 172263936ddaSChristoph Hellwig dquot_decr_inodes(inode->i_dquot[cnt], 1); 1723884d179dSJan Kara } 1724884d179dSJan Kara spin_unlock(&dq_data_lock); 1725dc52dd3aSDmitry Monakhov mark_all_dquot_dirty(inode->i_dquot); 1726884d179dSJan Kara flush_warnings(inode->i_dquot, warntype); 1727884d179dSJan Kara up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1728884d179dSJan Kara } 1729884d179dSJan Kara EXPORT_SYMBOL(dquot_free_inode); 1730884d179dSJan Kara 1731884d179dSJan Kara /* 1732884d179dSJan Kara * Transfer the number of inode and blocks from one diskquota to an other. 1733bc8e5f07SJan Kara * On success, dquot references in transfer_to are consumed and references 1734bc8e5f07SJan Kara * to original dquots that need to be released are placed there. On failure, 1735bc8e5f07SJan Kara * references are kept untouched. 1736884d179dSJan Kara * 1737884d179dSJan Kara * This operation can block, but only after everything is updated 1738884d179dSJan Kara * A transaction must be started when entering this function. 1739bc8e5f07SJan Kara * 1740884d179dSJan Kara */ 1741bc8e5f07SJan Kara int __dquot_transfer(struct inode *inode, struct dquot **transfer_to) 1742884d179dSJan Kara { 1743884d179dSJan Kara qsize_t space, cur_space; 1744884d179dSJan Kara qsize_t rsv_space = 0; 1745bc8e5f07SJan Kara struct dquot *transfer_from[MAXQUOTAS] = {}; 1746efd8f0e6SChristoph Hellwig int cnt, ret = 0; 17479e32784bSDmitry char is_valid[MAXQUOTAS] = {}; 1748884d179dSJan Kara char warntype_to[MAXQUOTAS]; 1749884d179dSJan Kara char warntype_from_inodes[MAXQUOTAS], warntype_from_space[MAXQUOTAS]; 1750884d179dSJan Kara 1751884d179dSJan Kara /* First test before acquiring mutex - solves deadlocks when we 1752884d179dSJan Kara * re-enter the quota code and are already holding the mutex */ 1753884d179dSJan Kara if (IS_NOQUOTA(inode)) 1754efd8f0e6SChristoph Hellwig return 0; 1755884d179dSJan Kara /* Initialize the arrays */ 1756bc8e5f07SJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 1757884d179dSJan Kara warntype_to[cnt] = QUOTA_NL_NOWARN; 1758884d179dSJan Kara down_write(&sb_dqopt(inode->i_sb)->dqptr_sem); 1759884d179dSJan Kara if (IS_NOQUOTA(inode)) { /* File without quota accounting? */ 1760884d179dSJan Kara up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); 1761bc8e5f07SJan Kara return 0; 1762884d179dSJan Kara } 1763884d179dSJan Kara spin_lock(&dq_data_lock); 1764884d179dSJan Kara cur_space = inode_get_bytes(inode); 1765fd8fbfc1SDmitry Monakhov rsv_space = inode_get_rsv_space(inode); 1766884d179dSJan Kara space = cur_space + rsv_space; 1767884d179dSJan Kara /* Build the transfer_from list and check the limits */ 1768884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 17699e32784bSDmitry /* 17709e32784bSDmitry * Skip changes for same uid or gid or for turned off quota-type. 17719e32784bSDmitry */ 1772dd6f3c6dSJan Kara if (!transfer_to[cnt]) 1773884d179dSJan Kara continue; 17749e32784bSDmitry /* Avoid races with quotaoff() */ 17759e32784bSDmitry if (!sb_has_quota_active(inode->i_sb, cnt)) 17769e32784bSDmitry continue; 17779e32784bSDmitry is_valid[cnt] = 1; 1778884d179dSJan Kara transfer_from[cnt] = inode->i_dquot[cnt]; 1779efd8f0e6SChristoph Hellwig ret = check_idq(transfer_to[cnt], 1, warntype_to + cnt); 1780efd8f0e6SChristoph Hellwig if (ret) 1781efd8f0e6SChristoph Hellwig goto over_quota; 1782efd8f0e6SChristoph Hellwig ret = check_bdq(transfer_to[cnt], space, 0, warntype_to + cnt); 1783efd8f0e6SChristoph Hellwig if (ret) 1784884d179dSJan Kara goto over_quota; 1785884d179dSJan Kara } 1786884d179dSJan Kara 1787884d179dSJan Kara /* 1788884d179dSJan Kara * Finally perform the needed transfer from transfer_from to transfer_to 1789884d179dSJan Kara */ 1790884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 17919e32784bSDmitry if (!is_valid[cnt]) 1792884d179dSJan Kara continue; 1793884d179dSJan Kara /* Due to IO error we might not have transfer_from[] structure */ 1794884d179dSJan Kara if (transfer_from[cnt]) { 1795884d179dSJan Kara warntype_from_inodes[cnt] = 1796884d179dSJan Kara info_idq_free(transfer_from[cnt], 1); 1797884d179dSJan Kara warntype_from_space[cnt] = 1798884d179dSJan Kara info_bdq_free(transfer_from[cnt], space); 1799884d179dSJan Kara dquot_decr_inodes(transfer_from[cnt], 1); 1800884d179dSJan Kara dquot_decr_space(transfer_from[cnt], cur_space); 1801884d179dSJan Kara dquot_free_reserved_space(transfer_from[cnt], 1802884d179dSJan Kara rsv_space); 1803884d179dSJan Kara } 1804884d179dSJan Kara 1805884d179dSJan Kara dquot_incr_inodes(transfer_to[cnt], 1); 1806884d179dSJan Kara dquot_incr_space(transfer_to[cnt], cur_space); 1807884d179dSJan Kara dquot_resv_space(transfer_to[cnt], rsv_space); 1808884d179dSJan Kara 1809884d179dSJan Kara inode->i_dquot[cnt] = transfer_to[cnt]; 1810884d179dSJan Kara } 1811884d179dSJan Kara spin_unlock(&dq_data_lock); 1812884d179dSJan Kara up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); 1813884d179dSJan Kara 1814dc52dd3aSDmitry Monakhov mark_all_dquot_dirty(transfer_from); 1815dc52dd3aSDmitry Monakhov mark_all_dquot_dirty(transfer_to); 181686f3cbecSJan Kara flush_warnings(transfer_to, warntype_to); 181786f3cbecSJan Kara flush_warnings(transfer_from, warntype_from_inodes); 181886f3cbecSJan Kara flush_warnings(transfer_from, warntype_from_space); 1819bc8e5f07SJan Kara /* Pass back references to put */ 1820dc52dd3aSDmitry Monakhov for (cnt = 0; cnt < MAXQUOTAS; cnt++) 18219e32784bSDmitry if (is_valid[cnt]) 1822bc8e5f07SJan Kara transfer_to[cnt] = transfer_from[cnt]; 182386f3cbecSJan Kara return 0; 1824884d179dSJan Kara over_quota: 1825884d179dSJan Kara spin_unlock(&dq_data_lock); 1826884d179dSJan Kara up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); 182786f3cbecSJan Kara flush_warnings(transfer_to, warntype_to); 182886f3cbecSJan Kara return ret; 1829884d179dSJan Kara } 1830bc8e5f07SJan Kara EXPORT_SYMBOL(__dquot_transfer); 1831884d179dSJan Kara 18328ddd69d6SDmitry Monakhov /* Wrapper for transferring ownership of an inode for uid/gid only 18338ddd69d6SDmitry Monakhov * Called from FSXXX_setattr() 18348ddd69d6SDmitry Monakhov */ 1835b43fa828SChristoph Hellwig int dquot_transfer(struct inode *inode, struct iattr *iattr) 1836884d179dSJan Kara { 1837bc8e5f07SJan Kara struct dquot *transfer_to[MAXQUOTAS] = {}; 1838bc8e5f07SJan Kara struct super_block *sb = inode->i_sb; 1839bc8e5f07SJan Kara int ret; 18408ddd69d6SDmitry Monakhov 1841189eef59SChristoph Hellwig if (!dquot_active(inode)) 1842884d179dSJan Kara return 0; 1843bc8e5f07SJan Kara 1844bc8e5f07SJan Kara if (iattr->ia_valid & ATTR_UID && iattr->ia_uid != inode->i_uid) 1845bc8e5f07SJan Kara transfer_to[USRQUOTA] = dqget(sb, iattr->ia_uid, USRQUOTA); 1846bc8e5f07SJan Kara if (iattr->ia_valid & ATTR_GID && iattr->ia_gid != inode->i_gid) 18474dea4969SJan Kara transfer_to[GRPQUOTA] = dqget(sb, iattr->ia_gid, GRPQUOTA); 1848bc8e5f07SJan Kara 1849bc8e5f07SJan Kara ret = __dquot_transfer(inode, transfer_to); 1850bc8e5f07SJan Kara dqput_all(transfer_to); 1851bc8e5f07SJan Kara return ret; 1852884d179dSJan Kara } 1853b43fa828SChristoph Hellwig EXPORT_SYMBOL(dquot_transfer); 1854884d179dSJan Kara 1855884d179dSJan Kara /* 1856884d179dSJan Kara * Write info of quota file to disk 1857884d179dSJan Kara */ 1858884d179dSJan Kara int dquot_commit_info(struct super_block *sb, int type) 1859884d179dSJan Kara { 1860884d179dSJan Kara int ret; 1861884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 1862884d179dSJan Kara 1863884d179dSJan Kara mutex_lock(&dqopt->dqio_mutex); 1864884d179dSJan Kara ret = dqopt->ops[type]->write_file_info(sb, type); 1865884d179dSJan Kara mutex_unlock(&dqopt->dqio_mutex); 1866884d179dSJan Kara return ret; 1867884d179dSJan Kara } 1868884d179dSJan Kara EXPORT_SYMBOL(dquot_commit_info); 1869884d179dSJan Kara 1870884d179dSJan Kara /* 1871884d179dSJan Kara * Definitions of diskquota operations. 1872884d179dSJan Kara */ 187361e225dcSAlexey Dobriyan const struct dquot_operations dquot_operations = { 1874884d179dSJan Kara .write_dquot = dquot_commit, 1875884d179dSJan Kara .acquire_dquot = dquot_acquire, 1876884d179dSJan Kara .release_dquot = dquot_release, 1877884d179dSJan Kara .mark_dirty = dquot_mark_dquot_dirty, 1878884d179dSJan Kara .write_info = dquot_commit_info, 1879884d179dSJan Kara .alloc_dquot = dquot_alloc, 1880884d179dSJan Kara .destroy_dquot = dquot_destroy, 1881884d179dSJan Kara }; 1882123e9cafSChristoph Hellwig EXPORT_SYMBOL(dquot_operations); 1883884d179dSJan Kara 1884884d179dSJan Kara /* 1885907f4554SChristoph Hellwig * Generic helper for ->open on filesystems supporting disk quotas. 1886907f4554SChristoph Hellwig */ 1887907f4554SChristoph Hellwig int dquot_file_open(struct inode *inode, struct file *file) 1888907f4554SChristoph Hellwig { 1889907f4554SChristoph Hellwig int error; 1890907f4554SChristoph Hellwig 1891907f4554SChristoph Hellwig error = generic_file_open(inode, file); 1892907f4554SChristoph Hellwig if (!error && (file->f_mode & FMODE_WRITE)) 1893871a2931SChristoph Hellwig dquot_initialize(inode); 1894907f4554SChristoph Hellwig return error; 1895907f4554SChristoph Hellwig } 1896907f4554SChristoph Hellwig EXPORT_SYMBOL(dquot_file_open); 1897907f4554SChristoph Hellwig 1898907f4554SChristoph Hellwig /* 1899884d179dSJan Kara * Turn quota off on a device. type == -1 ==> quotaoff for all types (umount) 1900884d179dSJan Kara */ 19010f0dd62fSChristoph Hellwig int dquot_disable(struct super_block *sb, int type, unsigned int flags) 1902884d179dSJan Kara { 1903884d179dSJan Kara int cnt, ret = 0; 1904884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 1905884d179dSJan Kara struct inode *toputinode[MAXQUOTAS]; 1906884d179dSJan Kara 1907884d179dSJan Kara /* Cannot turn off usage accounting without turning off limits, or 1908884d179dSJan Kara * suspend quotas and simultaneously turn quotas off. */ 1909884d179dSJan Kara if ((flags & DQUOT_USAGE_ENABLED && !(flags & DQUOT_LIMITS_ENABLED)) 1910884d179dSJan Kara || (flags & DQUOT_SUSPENDED && flags & (DQUOT_LIMITS_ENABLED | 1911884d179dSJan Kara DQUOT_USAGE_ENABLED))) 1912884d179dSJan Kara return -EINVAL; 1913884d179dSJan Kara 1914884d179dSJan Kara /* We need to serialize quota_off() for device */ 1915884d179dSJan Kara mutex_lock(&dqopt->dqonoff_mutex); 1916884d179dSJan Kara 1917884d179dSJan Kara /* 1918884d179dSJan Kara * Skip everything if there's nothing to do. We have to do this because 1919884d179dSJan Kara * sometimes we are called when fill_super() failed and calling 1920884d179dSJan Kara * sync_fs() in such cases does no good. 1921884d179dSJan Kara */ 1922884d179dSJan Kara if (!sb_any_quota_loaded(sb)) { 1923884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 1924884d179dSJan Kara return 0; 1925884d179dSJan Kara } 1926884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1927884d179dSJan Kara toputinode[cnt] = NULL; 1928884d179dSJan Kara if (type != -1 && cnt != type) 1929884d179dSJan Kara continue; 1930884d179dSJan Kara if (!sb_has_quota_loaded(sb, cnt)) 1931884d179dSJan Kara continue; 1932884d179dSJan Kara 1933884d179dSJan Kara if (flags & DQUOT_SUSPENDED) { 1934884d179dSJan Kara spin_lock(&dq_state_lock); 1935884d179dSJan Kara dqopt->flags |= 1936884d179dSJan Kara dquot_state_flag(DQUOT_SUSPENDED, cnt); 1937884d179dSJan Kara spin_unlock(&dq_state_lock); 1938884d179dSJan Kara } else { 1939884d179dSJan Kara spin_lock(&dq_state_lock); 1940884d179dSJan Kara dqopt->flags &= ~dquot_state_flag(flags, cnt); 1941884d179dSJan Kara /* Turning off suspended quotas? */ 1942884d179dSJan Kara if (!sb_has_quota_loaded(sb, cnt) && 1943884d179dSJan Kara sb_has_quota_suspended(sb, cnt)) { 1944884d179dSJan Kara dqopt->flags &= ~dquot_state_flag( 1945884d179dSJan Kara DQUOT_SUSPENDED, cnt); 1946884d179dSJan Kara spin_unlock(&dq_state_lock); 1947884d179dSJan Kara iput(dqopt->files[cnt]); 1948884d179dSJan Kara dqopt->files[cnt] = NULL; 1949884d179dSJan Kara continue; 1950884d179dSJan Kara } 1951884d179dSJan Kara spin_unlock(&dq_state_lock); 1952884d179dSJan Kara } 1953884d179dSJan Kara 1954884d179dSJan Kara /* We still have to keep quota loaded? */ 1955884d179dSJan Kara if (sb_has_quota_loaded(sb, cnt) && !(flags & DQUOT_SUSPENDED)) 1956884d179dSJan Kara continue; 1957884d179dSJan Kara 1958884d179dSJan Kara /* Note: these are blocking operations */ 1959884d179dSJan Kara drop_dquot_ref(sb, cnt); 1960884d179dSJan Kara invalidate_dquots(sb, cnt); 1961884d179dSJan Kara /* 1962268157baSJan Kara * Now all dquots should be invalidated, all writes done so we 1963268157baSJan Kara * should be only users of the info. No locks needed. 1964884d179dSJan Kara */ 1965884d179dSJan Kara if (info_dirty(&dqopt->info[cnt])) 1966884d179dSJan Kara sb->dq_op->write_info(sb, cnt); 1967884d179dSJan Kara if (dqopt->ops[cnt]->free_file_info) 1968884d179dSJan Kara dqopt->ops[cnt]->free_file_info(sb, cnt); 1969884d179dSJan Kara put_quota_format(dqopt->info[cnt].dqi_format); 1970884d179dSJan Kara 1971884d179dSJan Kara toputinode[cnt] = dqopt->files[cnt]; 1972884d179dSJan Kara if (!sb_has_quota_loaded(sb, cnt)) 1973884d179dSJan Kara dqopt->files[cnt] = NULL; 1974884d179dSJan Kara dqopt->info[cnt].dqi_flags = 0; 1975884d179dSJan Kara dqopt->info[cnt].dqi_igrace = 0; 1976884d179dSJan Kara dqopt->info[cnt].dqi_bgrace = 0; 1977884d179dSJan Kara dqopt->ops[cnt] = NULL; 1978884d179dSJan Kara } 1979884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 1980884d179dSJan Kara 1981884d179dSJan Kara /* Skip syncing and setting flags if quota files are hidden */ 1982884d179dSJan Kara if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) 1983884d179dSJan Kara goto put_inodes; 1984884d179dSJan Kara 1985884d179dSJan Kara /* Sync the superblock so that buffers with quota data are written to 1986884d179dSJan Kara * disk (and so userspace sees correct data afterwards). */ 1987884d179dSJan Kara if (sb->s_op->sync_fs) 1988884d179dSJan Kara sb->s_op->sync_fs(sb, 1); 1989884d179dSJan Kara sync_blockdev(sb->s_bdev); 1990884d179dSJan Kara /* Now the quota files are just ordinary files and we can set the 1991884d179dSJan Kara * inode flags back. Moreover we discard the pagecache so that 1992884d179dSJan Kara * userspace sees the writes we did bypassing the pagecache. We 1993884d179dSJan Kara * must also discard the blockdev buffers so that we see the 1994884d179dSJan Kara * changes done by userspace on the next quotaon() */ 1995884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 1996884d179dSJan Kara if (toputinode[cnt]) { 1997884d179dSJan Kara mutex_lock(&dqopt->dqonoff_mutex); 1998884d179dSJan Kara /* If quota was reenabled in the meantime, we have 1999884d179dSJan Kara * nothing to do */ 2000884d179dSJan Kara if (!sb_has_quota_loaded(sb, cnt)) { 2001268157baSJan Kara mutex_lock_nested(&toputinode[cnt]->i_mutex, 2002268157baSJan Kara I_MUTEX_QUOTA); 2003884d179dSJan Kara toputinode[cnt]->i_flags &= ~(S_IMMUTABLE | 2004884d179dSJan Kara S_NOATIME | S_NOQUOTA); 2005268157baSJan Kara truncate_inode_pages(&toputinode[cnt]->i_data, 2006268157baSJan Kara 0); 2007884d179dSJan Kara mutex_unlock(&toputinode[cnt]->i_mutex); 200843d2932dSJan Kara mark_inode_dirty_sync(toputinode[cnt]); 2009884d179dSJan Kara } 2010884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 2011884d179dSJan Kara } 2012884d179dSJan Kara if (sb->s_bdev) 2013884d179dSJan Kara invalidate_bdev(sb->s_bdev); 2014884d179dSJan Kara put_inodes: 2015884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 2016884d179dSJan Kara if (toputinode[cnt]) { 2017884d179dSJan Kara /* On remount RO, we keep the inode pointer so that we 2018884d179dSJan Kara * can reenable quota on the subsequent remount RW. We 2019884d179dSJan Kara * have to check 'flags' variable and not use sb_has_ 2020884d179dSJan Kara * function because another quotaon / quotaoff could 2021884d179dSJan Kara * change global state before we got here. We refuse 2022884d179dSJan Kara * to suspend quotas when there is pending delete on 2023884d179dSJan Kara * the quota file... */ 2024884d179dSJan Kara if (!(flags & DQUOT_SUSPENDED)) 2025884d179dSJan Kara iput(toputinode[cnt]); 2026884d179dSJan Kara else if (!toputinode[cnt]->i_nlink) 2027884d179dSJan Kara ret = -EBUSY; 2028884d179dSJan Kara } 2029884d179dSJan Kara return ret; 2030884d179dSJan Kara } 20310f0dd62fSChristoph Hellwig EXPORT_SYMBOL(dquot_disable); 2032884d179dSJan Kara 2033287a8095SChristoph Hellwig int dquot_quota_off(struct super_block *sb, int type) 2034884d179dSJan Kara { 20350f0dd62fSChristoph Hellwig return dquot_disable(sb, type, 20360f0dd62fSChristoph Hellwig DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); 2037884d179dSJan Kara } 2038287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_quota_off); 20390f0dd62fSChristoph Hellwig 2040884d179dSJan Kara /* 2041884d179dSJan Kara * Turn quotas on on a device 2042884d179dSJan Kara */ 2043884d179dSJan Kara 2044884d179dSJan Kara /* 2045884d179dSJan Kara * Helper function to turn quotas on when we already have the inode of 2046884d179dSJan Kara * quota file and no quota information is loaded. 2047884d179dSJan Kara */ 2048884d179dSJan Kara static int vfs_load_quota_inode(struct inode *inode, int type, int format_id, 2049884d179dSJan Kara unsigned int flags) 2050884d179dSJan Kara { 2051884d179dSJan Kara struct quota_format_type *fmt = find_quota_format(format_id); 2052884d179dSJan Kara struct super_block *sb = inode->i_sb; 2053884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 2054884d179dSJan Kara int error; 2055884d179dSJan Kara int oldflags = -1; 2056884d179dSJan Kara 2057884d179dSJan Kara if (!fmt) 2058884d179dSJan Kara return -ESRCH; 2059884d179dSJan Kara if (!S_ISREG(inode->i_mode)) { 2060884d179dSJan Kara error = -EACCES; 2061884d179dSJan Kara goto out_fmt; 2062884d179dSJan Kara } 2063884d179dSJan Kara if (IS_RDONLY(inode)) { 2064884d179dSJan Kara error = -EROFS; 2065884d179dSJan Kara goto out_fmt; 2066884d179dSJan Kara } 2067884d179dSJan Kara if (!sb->s_op->quota_write || !sb->s_op->quota_read) { 2068884d179dSJan Kara error = -EINVAL; 2069884d179dSJan Kara goto out_fmt; 2070884d179dSJan Kara } 2071884d179dSJan Kara /* Usage always has to be set... */ 2072884d179dSJan Kara if (!(flags & DQUOT_USAGE_ENABLED)) { 2073884d179dSJan Kara error = -EINVAL; 2074884d179dSJan Kara goto out_fmt; 2075884d179dSJan Kara } 2076884d179dSJan Kara 2077884d179dSJan Kara if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) { 2078ab94c39bSJan Kara /* As we bypass the pagecache we must now flush all the 2079ab94c39bSJan Kara * dirty data and invalidate caches so that kernel sees 2080ab94c39bSJan Kara * changes from userspace. It is not enough to just flush 2081ab94c39bSJan Kara * the quota file since if blocksize < pagesize, invalidation 2082ab94c39bSJan Kara * of the cache could fail because of other unrelated dirty 2083ab94c39bSJan Kara * data */ 2084ab94c39bSJan Kara sync_filesystem(sb); 2085884d179dSJan Kara invalidate_bdev(sb->s_bdev); 2086884d179dSJan Kara } 2087884d179dSJan Kara mutex_lock(&dqopt->dqonoff_mutex); 2088884d179dSJan Kara if (sb_has_quota_loaded(sb, type)) { 2089884d179dSJan Kara error = -EBUSY; 2090884d179dSJan Kara goto out_lock; 2091884d179dSJan Kara } 2092884d179dSJan Kara 2093884d179dSJan Kara if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) { 2094884d179dSJan Kara /* We don't want quota and atime on quota files (deadlocks 2095884d179dSJan Kara * possible) Also nobody should write to the file - we use 2096884d179dSJan Kara * special IO operations which ignore the immutable bit. */ 2097dee86565SJan Kara mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA); 2098268157baSJan Kara oldflags = inode->i_flags & (S_NOATIME | S_IMMUTABLE | 2099268157baSJan Kara S_NOQUOTA); 2100884d179dSJan Kara inode->i_flags |= S_NOQUOTA | S_NOATIME | S_IMMUTABLE; 2101dee86565SJan Kara mutex_unlock(&inode->i_mutex); 210226245c94SJan Kara /* 210326245c94SJan Kara * When S_NOQUOTA is set, remove dquot references as no more 210426245c94SJan Kara * references can be added 210526245c94SJan Kara */ 21069f754758SChristoph Hellwig __dquot_drop(inode); 2107884d179dSJan Kara } 2108884d179dSJan Kara 2109884d179dSJan Kara error = -EIO; 2110884d179dSJan Kara dqopt->files[type] = igrab(inode); 2111884d179dSJan Kara if (!dqopt->files[type]) 2112884d179dSJan Kara goto out_lock; 2113884d179dSJan Kara error = -EINVAL; 2114884d179dSJan Kara if (!fmt->qf_ops->check_quota_file(sb, type)) 2115884d179dSJan Kara goto out_file_init; 2116884d179dSJan Kara 2117884d179dSJan Kara dqopt->ops[type] = fmt->qf_ops; 2118884d179dSJan Kara dqopt->info[type].dqi_format = fmt; 2119884d179dSJan Kara dqopt->info[type].dqi_fmt_id = format_id; 2120884d179dSJan Kara INIT_LIST_HEAD(&dqopt->info[type].dqi_dirty_list); 2121884d179dSJan Kara mutex_lock(&dqopt->dqio_mutex); 2122268157baSJan Kara error = dqopt->ops[type]->read_file_info(sb, type); 2123268157baSJan Kara if (error < 0) { 2124884d179dSJan Kara mutex_unlock(&dqopt->dqio_mutex); 2125884d179dSJan Kara goto out_file_init; 2126884d179dSJan Kara } 2127884d179dSJan Kara mutex_unlock(&dqopt->dqio_mutex); 2128884d179dSJan Kara spin_lock(&dq_state_lock); 2129884d179dSJan Kara dqopt->flags |= dquot_state_flag(flags, type); 2130884d179dSJan Kara spin_unlock(&dq_state_lock); 2131884d179dSJan Kara 2132884d179dSJan Kara add_dquot_ref(sb, type); 2133884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 2134884d179dSJan Kara 2135884d179dSJan Kara return 0; 2136884d179dSJan Kara 2137884d179dSJan Kara out_file_init: 2138884d179dSJan Kara dqopt->files[type] = NULL; 2139884d179dSJan Kara iput(inode); 2140884d179dSJan Kara out_lock: 2141884d179dSJan Kara if (oldflags != -1) { 2142dee86565SJan Kara mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA); 2143884d179dSJan Kara /* Set the flags back (in the case of accidental quotaon() 2144884d179dSJan Kara * on a wrong file we don't want to mess up the flags) */ 2145884d179dSJan Kara inode->i_flags &= ~(S_NOATIME | S_NOQUOTA | S_IMMUTABLE); 2146884d179dSJan Kara inode->i_flags |= oldflags; 2147dee86565SJan Kara mutex_unlock(&inode->i_mutex); 2148884d179dSJan Kara } 2149d01730d7SJiaying Zhang mutex_unlock(&dqopt->dqonoff_mutex); 2150884d179dSJan Kara out_fmt: 2151884d179dSJan Kara put_quota_format(fmt); 2152884d179dSJan Kara 2153884d179dSJan Kara return error; 2154884d179dSJan Kara } 2155884d179dSJan Kara 2156884d179dSJan Kara /* Reenable quotas on remount RW */ 21570f0dd62fSChristoph Hellwig int dquot_resume(struct super_block *sb, int type) 2158884d179dSJan Kara { 2159884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 2160884d179dSJan Kara struct inode *inode; 21610f0dd62fSChristoph Hellwig int ret = 0, cnt; 2162884d179dSJan Kara unsigned int flags; 2163884d179dSJan Kara 21640f0dd62fSChristoph Hellwig for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 21650f0dd62fSChristoph Hellwig if (type != -1 && cnt != type) 21660f0dd62fSChristoph Hellwig continue; 21670f0dd62fSChristoph Hellwig 2168884d179dSJan Kara mutex_lock(&dqopt->dqonoff_mutex); 21690f0dd62fSChristoph Hellwig if (!sb_has_quota_suspended(sb, cnt)) { 2170884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 21710f0dd62fSChristoph Hellwig continue; 2172884d179dSJan Kara } 21730f0dd62fSChristoph Hellwig inode = dqopt->files[cnt]; 21740f0dd62fSChristoph Hellwig dqopt->files[cnt] = NULL; 2175884d179dSJan Kara spin_lock(&dq_state_lock); 2176884d179dSJan Kara flags = dqopt->flags & dquot_state_flag(DQUOT_USAGE_ENABLED | 21770f0dd62fSChristoph Hellwig DQUOT_LIMITS_ENABLED, 21780f0dd62fSChristoph Hellwig cnt); 21790f0dd62fSChristoph Hellwig dqopt->flags &= ~dquot_state_flag(DQUOT_STATE_FLAGS, cnt); 2180884d179dSJan Kara spin_unlock(&dq_state_lock); 2181884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 2182884d179dSJan Kara 21830f0dd62fSChristoph Hellwig flags = dquot_generic_flag(flags, cnt); 21840f0dd62fSChristoph Hellwig ret = vfs_load_quota_inode(inode, cnt, 21850f0dd62fSChristoph Hellwig dqopt->info[cnt].dqi_fmt_id, flags); 2186884d179dSJan Kara iput(inode); 21870f0dd62fSChristoph Hellwig } 2188884d179dSJan Kara 2189884d179dSJan Kara return ret; 2190884d179dSJan Kara } 21910f0dd62fSChristoph Hellwig EXPORT_SYMBOL(dquot_resume); 2192884d179dSJan Kara 2193f00c9e44SJan Kara int dquot_quota_on(struct super_block *sb, int type, int format_id, 2194884d179dSJan Kara struct path *path) 2195884d179dSJan Kara { 2196884d179dSJan Kara int error = security_quota_on(path->dentry); 2197884d179dSJan Kara if (error) 2198884d179dSJan Kara return error; 2199884d179dSJan Kara /* Quota file not on the same filesystem? */ 2200884d179dSJan Kara if (path->mnt->mnt_sb != sb) 2201884d179dSJan Kara error = -EXDEV; 2202884d179dSJan Kara else 2203884d179dSJan Kara error = vfs_load_quota_inode(path->dentry->d_inode, type, 2204884d179dSJan Kara format_id, DQUOT_USAGE_ENABLED | 2205884d179dSJan Kara DQUOT_LIMITS_ENABLED); 2206884d179dSJan Kara return error; 2207884d179dSJan Kara } 2208287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_quota_on); 2209884d179dSJan Kara 2210884d179dSJan Kara /* 2211884d179dSJan Kara * More powerful function for turning on quotas allowing setting 2212884d179dSJan Kara * of individual quota flags 2213884d179dSJan Kara */ 2214287a8095SChristoph Hellwig int dquot_enable(struct inode *inode, int type, int format_id, 2215884d179dSJan Kara unsigned int flags) 2216884d179dSJan Kara { 2217884d179dSJan Kara int ret = 0; 2218884d179dSJan Kara struct super_block *sb = inode->i_sb; 2219884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 2220884d179dSJan Kara 2221884d179dSJan Kara /* Just unsuspend quotas? */ 22220f0dd62fSChristoph Hellwig BUG_ON(flags & DQUOT_SUSPENDED); 22230f0dd62fSChristoph Hellwig 2224884d179dSJan Kara if (!flags) 2225884d179dSJan Kara return 0; 2226884d179dSJan Kara /* Just updating flags needed? */ 2227884d179dSJan Kara if (sb_has_quota_loaded(sb, type)) { 2228884d179dSJan Kara mutex_lock(&dqopt->dqonoff_mutex); 2229884d179dSJan Kara /* Now do a reliable test... */ 2230884d179dSJan Kara if (!sb_has_quota_loaded(sb, type)) { 2231884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 2232884d179dSJan Kara goto load_quota; 2233884d179dSJan Kara } 2234884d179dSJan Kara if (flags & DQUOT_USAGE_ENABLED && 2235884d179dSJan Kara sb_has_quota_usage_enabled(sb, type)) { 2236884d179dSJan Kara ret = -EBUSY; 2237884d179dSJan Kara goto out_lock; 2238884d179dSJan Kara } 2239884d179dSJan Kara if (flags & DQUOT_LIMITS_ENABLED && 2240884d179dSJan Kara sb_has_quota_limits_enabled(sb, type)) { 2241884d179dSJan Kara ret = -EBUSY; 2242884d179dSJan Kara goto out_lock; 2243884d179dSJan Kara } 2244884d179dSJan Kara spin_lock(&dq_state_lock); 2245884d179dSJan Kara sb_dqopt(sb)->flags |= dquot_state_flag(flags, type); 2246884d179dSJan Kara spin_unlock(&dq_state_lock); 2247884d179dSJan Kara out_lock: 2248884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 2249884d179dSJan Kara return ret; 2250884d179dSJan Kara } 2251884d179dSJan Kara 2252884d179dSJan Kara load_quota: 2253884d179dSJan Kara return vfs_load_quota_inode(inode, type, format_id, flags); 2254884d179dSJan Kara } 2255287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_enable); 2256884d179dSJan Kara 2257884d179dSJan Kara /* 2258884d179dSJan Kara * This function is used when filesystem needs to initialize quotas 2259884d179dSJan Kara * during mount time. 2260884d179dSJan Kara */ 2261287a8095SChristoph Hellwig int dquot_quota_on_mount(struct super_block *sb, char *qf_name, 2262884d179dSJan Kara int format_id, int type) 2263884d179dSJan Kara { 2264884d179dSJan Kara struct dentry *dentry; 2265884d179dSJan Kara int error; 2266884d179dSJan Kara 2267c56818d7SJan Kara mutex_lock(&sb->s_root->d_inode->i_mutex); 2268884d179dSJan Kara dentry = lookup_one_len(qf_name, sb->s_root, strlen(qf_name)); 2269c56818d7SJan Kara mutex_unlock(&sb->s_root->d_inode->i_mutex); 2270884d179dSJan Kara if (IS_ERR(dentry)) 2271884d179dSJan Kara return PTR_ERR(dentry); 2272884d179dSJan Kara 2273884d179dSJan Kara if (!dentry->d_inode) { 2274884d179dSJan Kara error = -ENOENT; 2275884d179dSJan Kara goto out; 2276884d179dSJan Kara } 2277884d179dSJan Kara 2278884d179dSJan Kara error = security_quota_on(dentry); 2279884d179dSJan Kara if (!error) 2280884d179dSJan Kara error = vfs_load_quota_inode(dentry->d_inode, type, format_id, 2281884d179dSJan Kara DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); 2282884d179dSJan Kara 2283884d179dSJan Kara out: 2284884d179dSJan Kara dput(dentry); 2285884d179dSJan Kara return error; 2286884d179dSJan Kara } 2287287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_quota_on_mount); 2288884d179dSJan Kara 2289884d179dSJan Kara static inline qsize_t qbtos(qsize_t blocks) 2290884d179dSJan Kara { 2291884d179dSJan Kara return blocks << QIF_DQBLKSIZE_BITS; 2292884d179dSJan Kara } 2293884d179dSJan Kara 2294884d179dSJan Kara static inline qsize_t stoqb(qsize_t space) 2295884d179dSJan Kara { 2296884d179dSJan Kara return (space + QIF_DQBLKSIZE - 1) >> QIF_DQBLKSIZE_BITS; 2297884d179dSJan Kara } 2298884d179dSJan Kara 2299884d179dSJan Kara /* Generic routine for getting common part of quota structure */ 2300b9b2dd36SChristoph Hellwig static void do_get_dqblk(struct dquot *dquot, struct fs_disk_quota *di) 2301884d179dSJan Kara { 2302884d179dSJan Kara struct mem_dqblk *dm = &dquot->dq_dqb; 2303884d179dSJan Kara 2304b9b2dd36SChristoph Hellwig memset(di, 0, sizeof(*di)); 2305b9b2dd36SChristoph Hellwig di->d_version = FS_DQUOT_VERSION; 2306b9b2dd36SChristoph Hellwig di->d_flags = dquot->dq_type == USRQUOTA ? 2307ade7ce31SChristoph Hellwig FS_USER_QUOTA : FS_GROUP_QUOTA; 2308b9b2dd36SChristoph Hellwig di->d_id = dquot->dq_id; 2309b9b2dd36SChristoph Hellwig 2310884d179dSJan Kara spin_lock(&dq_data_lock); 2311b9b2dd36SChristoph Hellwig di->d_blk_hardlimit = stoqb(dm->dqb_bhardlimit); 2312b9b2dd36SChristoph Hellwig di->d_blk_softlimit = stoqb(dm->dqb_bsoftlimit); 2313b9b2dd36SChristoph Hellwig di->d_ino_hardlimit = dm->dqb_ihardlimit; 2314b9b2dd36SChristoph Hellwig di->d_ino_softlimit = dm->dqb_isoftlimit; 2315b9b2dd36SChristoph Hellwig di->d_bcount = dm->dqb_curspace + dm->dqb_rsvspace; 2316b9b2dd36SChristoph Hellwig di->d_icount = dm->dqb_curinodes; 2317b9b2dd36SChristoph Hellwig di->d_btimer = dm->dqb_btime; 2318b9b2dd36SChristoph Hellwig di->d_itimer = dm->dqb_itime; 2319884d179dSJan Kara spin_unlock(&dq_data_lock); 2320884d179dSJan Kara } 2321884d179dSJan Kara 2322287a8095SChristoph Hellwig int dquot_get_dqblk(struct super_block *sb, int type, qid_t id, 2323b9b2dd36SChristoph Hellwig struct fs_disk_quota *di) 2324884d179dSJan Kara { 2325884d179dSJan Kara struct dquot *dquot; 2326884d179dSJan Kara 2327884d179dSJan Kara dquot = dqget(sb, id, type); 2328dd6f3c6dSJan Kara if (!dquot) 2329884d179dSJan Kara return -ESRCH; 2330884d179dSJan Kara do_get_dqblk(dquot, di); 2331884d179dSJan Kara dqput(dquot); 2332884d179dSJan Kara 2333884d179dSJan Kara return 0; 2334884d179dSJan Kara } 2335287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_get_dqblk); 2336884d179dSJan Kara 2337c472b432SChristoph Hellwig #define VFS_FS_DQ_MASK \ 2338c472b432SChristoph Hellwig (FS_DQ_BCOUNT | FS_DQ_BSOFT | FS_DQ_BHARD | \ 2339c472b432SChristoph Hellwig FS_DQ_ICOUNT | FS_DQ_ISOFT | FS_DQ_IHARD | \ 2340c472b432SChristoph Hellwig FS_DQ_BTIMER | FS_DQ_ITIMER) 2341c472b432SChristoph Hellwig 2342884d179dSJan Kara /* Generic routine for setting common part of quota structure */ 2343c472b432SChristoph Hellwig static int do_set_dqblk(struct dquot *dquot, struct fs_disk_quota *di) 2344884d179dSJan Kara { 2345884d179dSJan Kara struct mem_dqblk *dm = &dquot->dq_dqb; 2346884d179dSJan Kara int check_blim = 0, check_ilim = 0; 2347884d179dSJan Kara struct mem_dqinfo *dqi = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_type]; 2348884d179dSJan Kara 2349c472b432SChristoph Hellwig if (di->d_fieldmask & ~VFS_FS_DQ_MASK) 2350c472b432SChristoph Hellwig return -EINVAL; 2351c472b432SChristoph Hellwig 2352c472b432SChristoph Hellwig if (((di->d_fieldmask & FS_DQ_BSOFT) && 2353c472b432SChristoph Hellwig (di->d_blk_softlimit > dqi->dqi_maxblimit)) || 2354c472b432SChristoph Hellwig ((di->d_fieldmask & FS_DQ_BHARD) && 2355c472b432SChristoph Hellwig (di->d_blk_hardlimit > dqi->dqi_maxblimit)) || 2356c472b432SChristoph Hellwig ((di->d_fieldmask & FS_DQ_ISOFT) && 2357c472b432SChristoph Hellwig (di->d_ino_softlimit > dqi->dqi_maxilimit)) || 2358c472b432SChristoph Hellwig ((di->d_fieldmask & FS_DQ_IHARD) && 2359c472b432SChristoph Hellwig (di->d_ino_hardlimit > dqi->dqi_maxilimit))) 2360884d179dSJan Kara return -ERANGE; 2361884d179dSJan Kara 2362884d179dSJan Kara spin_lock(&dq_data_lock); 2363c472b432SChristoph Hellwig if (di->d_fieldmask & FS_DQ_BCOUNT) { 2364c472b432SChristoph Hellwig dm->dqb_curspace = di->d_bcount - dm->dqb_rsvspace; 2365884d179dSJan Kara check_blim = 1; 236608261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags); 2367884d179dSJan Kara } 2368c472b432SChristoph Hellwig 2369c472b432SChristoph Hellwig if (di->d_fieldmask & FS_DQ_BSOFT) 2370c472b432SChristoph Hellwig dm->dqb_bsoftlimit = qbtos(di->d_blk_softlimit); 2371c472b432SChristoph Hellwig if (di->d_fieldmask & FS_DQ_BHARD) 2372c472b432SChristoph Hellwig dm->dqb_bhardlimit = qbtos(di->d_blk_hardlimit); 2373c472b432SChristoph Hellwig if (di->d_fieldmask & (FS_DQ_BSOFT | FS_DQ_BHARD)) { 2374884d179dSJan Kara check_blim = 1; 237508261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags); 2376884d179dSJan Kara } 2377c472b432SChristoph Hellwig 2378c472b432SChristoph Hellwig if (di->d_fieldmask & FS_DQ_ICOUNT) { 2379c472b432SChristoph Hellwig dm->dqb_curinodes = di->d_icount; 2380884d179dSJan Kara check_ilim = 1; 238108261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags); 2382884d179dSJan Kara } 2383c472b432SChristoph Hellwig 2384c472b432SChristoph Hellwig if (di->d_fieldmask & FS_DQ_ISOFT) 2385c472b432SChristoph Hellwig dm->dqb_isoftlimit = di->d_ino_softlimit; 2386c472b432SChristoph Hellwig if (di->d_fieldmask & FS_DQ_IHARD) 2387c472b432SChristoph Hellwig dm->dqb_ihardlimit = di->d_ino_hardlimit; 2388c472b432SChristoph Hellwig if (di->d_fieldmask & (FS_DQ_ISOFT | FS_DQ_IHARD)) { 2389884d179dSJan Kara check_ilim = 1; 239008261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags); 2391884d179dSJan Kara } 2392c472b432SChristoph Hellwig 2393c472b432SChristoph Hellwig if (di->d_fieldmask & FS_DQ_BTIMER) { 2394c472b432SChristoph Hellwig dm->dqb_btime = di->d_btimer; 2395884d179dSJan Kara check_blim = 1; 239608261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags); 2397884d179dSJan Kara } 2398c472b432SChristoph Hellwig 2399c472b432SChristoph Hellwig if (di->d_fieldmask & FS_DQ_ITIMER) { 2400c472b432SChristoph Hellwig dm->dqb_itime = di->d_itimer; 2401884d179dSJan Kara check_ilim = 1; 240208261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags); 2403884d179dSJan Kara } 2404884d179dSJan Kara 2405884d179dSJan Kara if (check_blim) { 2406268157baSJan Kara if (!dm->dqb_bsoftlimit || 2407268157baSJan Kara dm->dqb_curspace < dm->dqb_bsoftlimit) { 2408884d179dSJan Kara dm->dqb_btime = 0; 2409884d179dSJan Kara clear_bit(DQ_BLKS_B, &dquot->dq_flags); 2410c472b432SChristoph Hellwig } else if (!(di->d_fieldmask & FS_DQ_BTIMER)) 2411268157baSJan Kara /* Set grace only if user hasn't provided his own... */ 2412884d179dSJan Kara dm->dqb_btime = get_seconds() + dqi->dqi_bgrace; 2413884d179dSJan Kara } 2414884d179dSJan Kara if (check_ilim) { 2415268157baSJan Kara if (!dm->dqb_isoftlimit || 2416268157baSJan Kara dm->dqb_curinodes < dm->dqb_isoftlimit) { 2417884d179dSJan Kara dm->dqb_itime = 0; 2418884d179dSJan Kara clear_bit(DQ_INODES_B, &dquot->dq_flags); 2419c472b432SChristoph Hellwig } else if (!(di->d_fieldmask & FS_DQ_ITIMER)) 2420268157baSJan Kara /* Set grace only if user hasn't provided his own... */ 2421884d179dSJan Kara dm->dqb_itime = get_seconds() + dqi->dqi_igrace; 2422884d179dSJan Kara } 2423268157baSJan Kara if (dm->dqb_bhardlimit || dm->dqb_bsoftlimit || dm->dqb_ihardlimit || 2424268157baSJan Kara dm->dqb_isoftlimit) 2425884d179dSJan Kara clear_bit(DQ_FAKE_B, &dquot->dq_flags); 2426884d179dSJan Kara else 2427884d179dSJan Kara set_bit(DQ_FAKE_B, &dquot->dq_flags); 2428884d179dSJan Kara spin_unlock(&dq_data_lock); 2429884d179dSJan Kara mark_dquot_dirty(dquot); 2430884d179dSJan Kara 2431884d179dSJan Kara return 0; 2432884d179dSJan Kara } 2433884d179dSJan Kara 2434287a8095SChristoph Hellwig int dquot_set_dqblk(struct super_block *sb, int type, qid_t id, 2435c472b432SChristoph Hellwig struct fs_disk_quota *di) 2436884d179dSJan Kara { 2437884d179dSJan Kara struct dquot *dquot; 2438884d179dSJan Kara int rc; 2439884d179dSJan Kara 2440884d179dSJan Kara dquot = dqget(sb, id, type); 2441884d179dSJan Kara if (!dquot) { 2442884d179dSJan Kara rc = -ESRCH; 2443884d179dSJan Kara goto out; 2444884d179dSJan Kara } 2445884d179dSJan Kara rc = do_set_dqblk(dquot, di); 2446884d179dSJan Kara dqput(dquot); 2447884d179dSJan Kara out: 2448884d179dSJan Kara return rc; 2449884d179dSJan Kara } 2450287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_set_dqblk); 2451884d179dSJan Kara 2452884d179dSJan Kara /* Generic routine for getting common part of quota file information */ 2453287a8095SChristoph Hellwig int dquot_get_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii) 2454884d179dSJan Kara { 2455884d179dSJan Kara struct mem_dqinfo *mi; 2456884d179dSJan Kara 2457884d179dSJan Kara mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); 2458884d179dSJan Kara if (!sb_has_quota_active(sb, type)) { 2459884d179dSJan Kara mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); 2460884d179dSJan Kara return -ESRCH; 2461884d179dSJan Kara } 2462884d179dSJan Kara mi = sb_dqopt(sb)->info + type; 2463884d179dSJan Kara spin_lock(&dq_data_lock); 2464884d179dSJan Kara ii->dqi_bgrace = mi->dqi_bgrace; 2465884d179dSJan Kara ii->dqi_igrace = mi->dqi_igrace; 2466884d179dSJan Kara ii->dqi_flags = mi->dqi_flags & DQF_MASK; 2467884d179dSJan Kara ii->dqi_valid = IIF_ALL; 2468884d179dSJan Kara spin_unlock(&dq_data_lock); 2469884d179dSJan Kara mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); 2470884d179dSJan Kara return 0; 2471884d179dSJan Kara } 2472287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_get_dqinfo); 2473884d179dSJan Kara 2474884d179dSJan Kara /* Generic routine for setting common part of quota file information */ 2475287a8095SChristoph Hellwig int dquot_set_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii) 2476884d179dSJan Kara { 2477884d179dSJan Kara struct mem_dqinfo *mi; 2478884d179dSJan Kara int err = 0; 2479884d179dSJan Kara 2480884d179dSJan Kara mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); 2481884d179dSJan Kara if (!sb_has_quota_active(sb, type)) { 2482884d179dSJan Kara err = -ESRCH; 2483884d179dSJan Kara goto out; 2484884d179dSJan Kara } 2485884d179dSJan Kara mi = sb_dqopt(sb)->info + type; 2486884d179dSJan Kara spin_lock(&dq_data_lock); 2487884d179dSJan Kara if (ii->dqi_valid & IIF_BGRACE) 2488884d179dSJan Kara mi->dqi_bgrace = ii->dqi_bgrace; 2489884d179dSJan Kara if (ii->dqi_valid & IIF_IGRACE) 2490884d179dSJan Kara mi->dqi_igrace = ii->dqi_igrace; 2491884d179dSJan Kara if (ii->dqi_valid & IIF_FLAGS) 2492268157baSJan Kara mi->dqi_flags = (mi->dqi_flags & ~DQF_MASK) | 2493268157baSJan Kara (ii->dqi_flags & DQF_MASK); 2494884d179dSJan Kara spin_unlock(&dq_data_lock); 2495884d179dSJan Kara mark_info_dirty(sb, type); 2496884d179dSJan Kara /* Force write to disk */ 2497884d179dSJan Kara sb->dq_op->write_info(sb, type); 2498884d179dSJan Kara out: 2499884d179dSJan Kara mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); 2500884d179dSJan Kara return err; 2501884d179dSJan Kara } 2502287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_set_dqinfo); 2503884d179dSJan Kara 2504287a8095SChristoph Hellwig const struct quotactl_ops dquot_quotactl_ops = { 2505287a8095SChristoph Hellwig .quota_on = dquot_quota_on, 2506287a8095SChristoph Hellwig .quota_off = dquot_quota_off, 2507287a8095SChristoph Hellwig .quota_sync = dquot_quota_sync, 2508287a8095SChristoph Hellwig .get_info = dquot_get_dqinfo, 2509287a8095SChristoph Hellwig .set_info = dquot_set_dqinfo, 2510287a8095SChristoph Hellwig .get_dqblk = dquot_get_dqblk, 2511287a8095SChristoph Hellwig .set_dqblk = dquot_set_dqblk 2512884d179dSJan Kara }; 2513287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_quotactl_ops); 2514dde95888SDmitry Monakhov 2515dde95888SDmitry Monakhov static int do_proc_dqstats(struct ctl_table *table, int write, 2516dde95888SDmitry Monakhov void __user *buffer, size_t *lenp, loff_t *ppos) 2517dde95888SDmitry Monakhov { 2518dde95888SDmitry Monakhov unsigned int type = (int *)table->data - dqstats.stat; 2519f32764bdSDmitry Monakhov 2520f32764bdSDmitry Monakhov /* Update global table */ 2521f32764bdSDmitry Monakhov dqstats.stat[type] = 2522f32764bdSDmitry Monakhov percpu_counter_sum_positive(&dqstats.counter[type]); 2523dde95888SDmitry Monakhov return proc_dointvec(table, write, buffer, lenp, ppos); 2524dde95888SDmitry Monakhov } 2525dde95888SDmitry Monakhov 2526884d179dSJan Kara static ctl_table fs_dqstats_table[] = { 2527884d179dSJan Kara { 2528884d179dSJan Kara .procname = "lookups", 2529dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_LOOKUPS], 2530884d179dSJan Kara .maxlen = sizeof(int), 2531884d179dSJan Kara .mode = 0444, 2532dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2533884d179dSJan Kara }, 2534884d179dSJan Kara { 2535884d179dSJan Kara .procname = "drops", 2536dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_DROPS], 2537884d179dSJan Kara .maxlen = sizeof(int), 2538884d179dSJan Kara .mode = 0444, 2539dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2540884d179dSJan Kara }, 2541884d179dSJan Kara { 2542884d179dSJan Kara .procname = "reads", 2543dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_READS], 2544884d179dSJan Kara .maxlen = sizeof(int), 2545884d179dSJan Kara .mode = 0444, 2546dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2547884d179dSJan Kara }, 2548884d179dSJan Kara { 2549884d179dSJan Kara .procname = "writes", 2550dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_WRITES], 2551884d179dSJan Kara .maxlen = sizeof(int), 2552884d179dSJan Kara .mode = 0444, 2553dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2554884d179dSJan Kara }, 2555884d179dSJan Kara { 2556884d179dSJan Kara .procname = "cache_hits", 2557dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_CACHE_HITS], 2558884d179dSJan Kara .maxlen = sizeof(int), 2559884d179dSJan Kara .mode = 0444, 2560dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2561884d179dSJan Kara }, 2562884d179dSJan Kara { 2563884d179dSJan Kara .procname = "allocated_dquots", 2564dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_ALLOC_DQUOTS], 2565884d179dSJan Kara .maxlen = sizeof(int), 2566884d179dSJan Kara .mode = 0444, 2567dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2568884d179dSJan Kara }, 2569884d179dSJan Kara { 2570884d179dSJan Kara .procname = "free_dquots", 2571dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_FREE_DQUOTS], 2572884d179dSJan Kara .maxlen = sizeof(int), 2573884d179dSJan Kara .mode = 0444, 2574dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2575884d179dSJan Kara }, 2576884d179dSJan Kara { 2577884d179dSJan Kara .procname = "syncs", 2578dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_SYNCS], 2579884d179dSJan Kara .maxlen = sizeof(int), 2580884d179dSJan Kara .mode = 0444, 2581dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2582884d179dSJan Kara }, 2583884d179dSJan Kara #ifdef CONFIG_PRINT_QUOTA_WARNING 2584884d179dSJan Kara { 2585884d179dSJan Kara .procname = "warnings", 2586884d179dSJan Kara .data = &flag_print_warnings, 2587884d179dSJan Kara .maxlen = sizeof(int), 2588884d179dSJan Kara .mode = 0644, 25896d456111SEric W. Biederman .proc_handler = proc_dointvec, 2590884d179dSJan Kara }, 2591884d179dSJan Kara #endif 2592ab09203eSEric W. Biederman { }, 2593884d179dSJan Kara }; 2594884d179dSJan Kara 2595884d179dSJan Kara static ctl_table fs_table[] = { 2596884d179dSJan Kara { 2597884d179dSJan Kara .procname = "quota", 2598884d179dSJan Kara .mode = 0555, 2599884d179dSJan Kara .child = fs_dqstats_table, 2600884d179dSJan Kara }, 2601ab09203eSEric W. Biederman { }, 2602884d179dSJan Kara }; 2603884d179dSJan Kara 2604884d179dSJan Kara static ctl_table sys_table[] = { 2605884d179dSJan Kara { 2606884d179dSJan Kara .procname = "fs", 2607884d179dSJan Kara .mode = 0555, 2608884d179dSJan Kara .child = fs_table, 2609884d179dSJan Kara }, 2610ab09203eSEric W. Biederman { }, 2611884d179dSJan Kara }; 2612884d179dSJan Kara 2613884d179dSJan Kara static int __init dquot_init(void) 2614884d179dSJan Kara { 2615f32764bdSDmitry Monakhov int i, ret; 2616884d179dSJan Kara unsigned long nr_hash, order; 2617884d179dSJan Kara 2618884d179dSJan Kara printk(KERN_NOTICE "VFS: Disk quotas %s\n", __DQUOT_VERSION__); 2619884d179dSJan Kara 2620884d179dSJan Kara register_sysctl_table(sys_table); 2621884d179dSJan Kara 2622884d179dSJan Kara dquot_cachep = kmem_cache_create("dquot", 2623884d179dSJan Kara sizeof(struct dquot), sizeof(unsigned long) * 4, 2624884d179dSJan Kara (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| 2625884d179dSJan Kara SLAB_MEM_SPREAD|SLAB_PANIC), 2626884d179dSJan Kara NULL); 2627884d179dSJan Kara 2628884d179dSJan Kara order = 0; 2629884d179dSJan Kara dquot_hash = (struct hlist_head *)__get_free_pages(GFP_ATOMIC, order); 2630884d179dSJan Kara if (!dquot_hash) 2631884d179dSJan Kara panic("Cannot create dquot hash table"); 2632884d179dSJan Kara 2633f32764bdSDmitry Monakhov for (i = 0; i < _DQST_DQSTAT_LAST; i++) { 2634f32764bdSDmitry Monakhov ret = percpu_counter_init(&dqstats.counter[i], 0); 2635f32764bdSDmitry Monakhov if (ret) 2636f32764bdSDmitry Monakhov panic("Cannot create dquot stat counters"); 2637f32764bdSDmitry Monakhov } 2638dde95888SDmitry Monakhov 2639884d179dSJan Kara /* Find power-of-two hlist_heads which can fit into allocation */ 2640884d179dSJan Kara nr_hash = (1UL << order) * PAGE_SIZE / sizeof(struct hlist_head); 2641884d179dSJan Kara dq_hash_bits = 0; 2642884d179dSJan Kara do { 2643884d179dSJan Kara dq_hash_bits++; 2644884d179dSJan Kara } while (nr_hash >> dq_hash_bits); 2645884d179dSJan Kara dq_hash_bits--; 2646884d179dSJan Kara 2647884d179dSJan Kara nr_hash = 1UL << dq_hash_bits; 2648884d179dSJan Kara dq_hash_mask = nr_hash - 1; 2649884d179dSJan Kara for (i = 0; i < nr_hash; i++) 2650884d179dSJan Kara INIT_HLIST_HEAD(dquot_hash + i); 2651884d179dSJan Kara 2652884d179dSJan Kara printk("Dquot-cache hash table entries: %ld (order %ld, %ld bytes)\n", 2653884d179dSJan Kara nr_hash, order, (PAGE_SIZE << order)); 2654884d179dSJan Kara 2655884d179dSJan Kara register_shrinker(&dqcache_shrinker); 2656884d179dSJan Kara 2657884d179dSJan Kara return 0; 2658884d179dSJan Kara } 2659884d179dSJan Kara module_init(dquot_init); 2660