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> 7440401530SAl Viro #include <linux/sched.h> 75884d179dSJan Kara #include <linux/kmod.h> 76884d179dSJan Kara #include <linux/namei.h> 77884d179dSJan Kara #include <linux/capability.h> 78884d179dSJan Kara #include <linux/quotaops.h> 7955fa6091SDave Chinner #include "../internal.h" /* ugh */ 80884d179dSJan Kara 81f3da9310SJeff Liu #include <linux/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: 119a80b12c3SJan Kara * dqonoff_mutex > i_mutex > journal_lock > dqptr_sem > dquot->dq_lock > 120884d179dSJan Kara * dqio_mutex 121a80b12c3SJan Kara * dqonoff_mutex > i_mutex comes from dquot_quota_sync, dquot_enable, etc. 122884d179dSJan Kara * The lock ordering of dqptr_sem imposed by quota code is only dqonoff_sem > 123884d179dSJan Kara * dqptr_sem. But filesystem has to count with the fact that functions such as 124884d179dSJan Kara * dquot_alloc_space() acquire dqptr_sem and they usually have to be called 125884d179dSJan Kara * from inside a transaction to keep filesystem consistency after a crash. Also 126884d179dSJan Kara * filesystems usually want to do some IO on dquot from ->mark_dirty which is 127884d179dSJan Kara * called with dqptr_sem held. 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 { 445b03f2456SJan Kara int ret = 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 */ 457b03f2456SJan Kara if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) 458884d179dSJan Kara ret = dqopt->ops[dquot->dq_type]->commit_dqblk(dquot); 459b03f2456SJan Kara else 460b03f2456SJan Kara ret = -EIO; 461884d179dSJan Kara out_sem: 462884d179dSJan Kara mutex_unlock(&dqopt->dqio_mutex); 463884d179dSJan Kara return ret; 464884d179dSJan Kara } 465884d179dSJan Kara EXPORT_SYMBOL(dquot_commit); 466884d179dSJan Kara 467884d179dSJan Kara /* 468884d179dSJan Kara * Release dquot 469884d179dSJan Kara */ 470884d179dSJan Kara int dquot_release(struct dquot *dquot) 471884d179dSJan Kara { 472884d179dSJan Kara int ret = 0, ret2 = 0; 473884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); 474884d179dSJan Kara 475884d179dSJan Kara mutex_lock(&dquot->dq_lock); 476884d179dSJan Kara /* Check whether we are not racing with some other dqget() */ 477884d179dSJan Kara if (atomic_read(&dquot->dq_count) > 1) 478884d179dSJan Kara goto out_dqlock; 479884d179dSJan Kara mutex_lock(&dqopt->dqio_mutex); 480884d179dSJan Kara if (dqopt->ops[dquot->dq_type]->release_dqblk) { 481884d179dSJan Kara ret = dqopt->ops[dquot->dq_type]->release_dqblk(dquot); 482884d179dSJan Kara /* Write the info */ 483268157baSJan Kara if (info_dirty(&dqopt->info[dquot->dq_type])) { 484268157baSJan Kara ret2 = dqopt->ops[dquot->dq_type]->write_file_info( 485268157baSJan Kara dquot->dq_sb, dquot->dq_type); 486268157baSJan Kara } 487884d179dSJan Kara if (ret >= 0) 488884d179dSJan Kara ret = ret2; 489884d179dSJan Kara } 490884d179dSJan Kara clear_bit(DQ_ACTIVE_B, &dquot->dq_flags); 491884d179dSJan Kara mutex_unlock(&dqopt->dqio_mutex); 492884d179dSJan Kara out_dqlock: 493884d179dSJan Kara mutex_unlock(&dquot->dq_lock); 494884d179dSJan Kara return ret; 495884d179dSJan Kara } 496884d179dSJan Kara EXPORT_SYMBOL(dquot_release); 497884d179dSJan Kara 498884d179dSJan Kara void dquot_destroy(struct dquot *dquot) 499884d179dSJan Kara { 500884d179dSJan Kara kmem_cache_free(dquot_cachep, dquot); 501884d179dSJan Kara } 502884d179dSJan Kara EXPORT_SYMBOL(dquot_destroy); 503884d179dSJan Kara 504884d179dSJan Kara static inline void do_destroy_dquot(struct dquot *dquot) 505884d179dSJan Kara { 506884d179dSJan Kara dquot->dq_sb->dq_op->destroy_dquot(dquot); 507884d179dSJan Kara } 508884d179dSJan Kara 509884d179dSJan Kara /* Invalidate all dquots on the list. Note that this function is called after 510884d179dSJan Kara * quota is disabled and pointers from inodes removed so there cannot be new 511884d179dSJan Kara * quota users. There can still be some users of quotas due to inodes being 512884d179dSJan Kara * just deleted or pruned by prune_icache() (those are not attached to any 513884d179dSJan Kara * list) or parallel quotactl call. We have to wait for such users. 514884d179dSJan Kara */ 515884d179dSJan Kara static void invalidate_dquots(struct super_block *sb, int type) 516884d179dSJan Kara { 517884d179dSJan Kara struct dquot *dquot, *tmp; 518884d179dSJan Kara 519884d179dSJan Kara restart: 520884d179dSJan Kara spin_lock(&dq_list_lock); 521884d179dSJan Kara list_for_each_entry_safe(dquot, tmp, &inuse_list, dq_inuse) { 522884d179dSJan Kara if (dquot->dq_sb != sb) 523884d179dSJan Kara continue; 524884d179dSJan Kara if (dquot->dq_type != type) 525884d179dSJan Kara continue; 526884d179dSJan Kara /* Wait for dquot users */ 527884d179dSJan Kara if (atomic_read(&dquot->dq_count)) { 528884d179dSJan Kara DEFINE_WAIT(wait); 529884d179dSJan Kara 530884d179dSJan Kara atomic_inc(&dquot->dq_count); 531884d179dSJan Kara prepare_to_wait(&dquot->dq_wait_unused, &wait, 532884d179dSJan Kara TASK_UNINTERRUPTIBLE); 533884d179dSJan Kara spin_unlock(&dq_list_lock); 534884d179dSJan Kara /* Once dqput() wakes us up, we know it's time to free 535884d179dSJan Kara * the dquot. 536884d179dSJan Kara * IMPORTANT: we rely on the fact that there is always 537884d179dSJan Kara * at most one process waiting for dquot to free. 538884d179dSJan Kara * Otherwise dq_count would be > 1 and we would never 539884d179dSJan Kara * wake up. 540884d179dSJan Kara */ 541884d179dSJan Kara if (atomic_read(&dquot->dq_count) > 1) 542884d179dSJan Kara schedule(); 543884d179dSJan Kara finish_wait(&dquot->dq_wait_unused, &wait); 544884d179dSJan Kara dqput(dquot); 545884d179dSJan Kara /* At this moment dquot() need not exist (it could be 546884d179dSJan Kara * reclaimed by prune_dqcache(). Hence we must 547884d179dSJan Kara * restart. */ 548884d179dSJan Kara goto restart; 549884d179dSJan Kara } 550884d179dSJan Kara /* 551884d179dSJan Kara * Quota now has no users and it has been written on last 552884d179dSJan Kara * dqput() 553884d179dSJan Kara */ 554884d179dSJan Kara remove_dquot_hash(dquot); 555884d179dSJan Kara remove_free_dquot(dquot); 556884d179dSJan Kara remove_inuse(dquot); 557884d179dSJan Kara do_destroy_dquot(dquot); 558884d179dSJan Kara } 559884d179dSJan Kara spin_unlock(&dq_list_lock); 560884d179dSJan Kara } 561884d179dSJan Kara 562884d179dSJan Kara /* Call callback for every active dquot on given filesystem */ 563884d179dSJan Kara int dquot_scan_active(struct super_block *sb, 564884d179dSJan Kara int (*fn)(struct dquot *dquot, unsigned long priv), 565884d179dSJan Kara unsigned long priv) 566884d179dSJan Kara { 567884d179dSJan Kara struct dquot *dquot, *old_dquot = NULL; 568884d179dSJan Kara int ret = 0; 569884d179dSJan Kara 570884d179dSJan Kara mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); 571884d179dSJan Kara spin_lock(&dq_list_lock); 572884d179dSJan Kara list_for_each_entry(dquot, &inuse_list, dq_inuse) { 573884d179dSJan Kara if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) 574884d179dSJan Kara continue; 575884d179dSJan Kara if (dquot->dq_sb != sb) 576884d179dSJan Kara continue; 577884d179dSJan Kara /* Now we have active dquot so we can just increase use count */ 578884d179dSJan Kara atomic_inc(&dquot->dq_count); 579884d179dSJan Kara spin_unlock(&dq_list_lock); 580dde95888SDmitry Monakhov dqstats_inc(DQST_LOOKUPS); 581884d179dSJan Kara dqput(old_dquot); 582884d179dSJan Kara old_dquot = dquot; 583884d179dSJan Kara ret = fn(dquot, priv); 584884d179dSJan Kara if (ret < 0) 585884d179dSJan Kara goto out; 586884d179dSJan Kara spin_lock(&dq_list_lock); 587884d179dSJan Kara /* We are safe to continue now because our dquot could not 588884d179dSJan Kara * be moved out of the inuse list while we hold the reference */ 589884d179dSJan Kara } 590884d179dSJan Kara spin_unlock(&dq_list_lock); 591884d179dSJan Kara out: 592884d179dSJan Kara dqput(old_dquot); 593884d179dSJan Kara mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); 594884d179dSJan Kara return ret; 595884d179dSJan Kara } 596884d179dSJan Kara EXPORT_SYMBOL(dquot_scan_active); 597884d179dSJan Kara 598ceed1723SJan Kara /* Write all dquot structures to quota files */ 599ceed1723SJan Kara int dquot_writeback_dquots(struct super_block *sb, int type) 600884d179dSJan Kara { 601884d179dSJan Kara struct list_head *dirty; 602884d179dSJan Kara struct dquot *dquot; 603884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 604884d179dSJan Kara int cnt; 605ceed1723SJan Kara int err, ret = 0; 606884d179dSJan Kara 607884d179dSJan Kara mutex_lock(&dqopt->dqonoff_mutex); 608884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 609884d179dSJan Kara if (type != -1 && cnt != type) 610884d179dSJan Kara continue; 611884d179dSJan Kara if (!sb_has_quota_active(sb, cnt)) 612884d179dSJan Kara continue; 613884d179dSJan Kara spin_lock(&dq_list_lock); 614884d179dSJan Kara dirty = &dqopt->info[cnt].dqi_dirty_list; 615884d179dSJan Kara while (!list_empty(dirty)) { 616268157baSJan Kara dquot = list_first_entry(dirty, struct dquot, 617268157baSJan Kara dq_dirty); 618884d179dSJan Kara /* Dirty and inactive can be only bad dquot... */ 619884d179dSJan Kara if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { 620884d179dSJan Kara clear_dquot_dirty(dquot); 621884d179dSJan Kara continue; 622884d179dSJan Kara } 623884d179dSJan Kara /* Now we have active dquot from which someone is 624884d179dSJan Kara * holding reference so we can safely just increase 625884d179dSJan Kara * use count */ 626884d179dSJan Kara atomic_inc(&dquot->dq_count); 627884d179dSJan Kara spin_unlock(&dq_list_lock); 628dde95888SDmitry Monakhov dqstats_inc(DQST_LOOKUPS); 629ceed1723SJan Kara err = sb->dq_op->write_dquot(dquot); 630ceed1723SJan Kara if (!ret && err) 631ceed1723SJan Kara err = ret; 632884d179dSJan Kara dqput(dquot); 633884d179dSJan Kara spin_lock(&dq_list_lock); 634884d179dSJan Kara } 635884d179dSJan Kara spin_unlock(&dq_list_lock); 636884d179dSJan Kara } 637884d179dSJan Kara 638884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 639884d179dSJan Kara if ((cnt == type || type == -1) && sb_has_quota_active(sb, cnt) 640884d179dSJan Kara && info_dirty(&dqopt->info[cnt])) 641884d179dSJan Kara sb->dq_op->write_info(sb, cnt); 642dde95888SDmitry Monakhov dqstats_inc(DQST_SYNCS); 643884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 644884d179dSJan Kara 645ceed1723SJan Kara return ret; 646ceed1723SJan Kara } 647ceed1723SJan Kara EXPORT_SYMBOL(dquot_writeback_dquots); 648ceed1723SJan Kara 649ceed1723SJan Kara /* Write all dquot structures to disk and make them visible from userspace */ 650ceed1723SJan Kara int dquot_quota_sync(struct super_block *sb, int type) 651ceed1723SJan Kara { 652ceed1723SJan Kara struct quota_info *dqopt = sb_dqopt(sb); 653ceed1723SJan Kara int cnt; 654ceed1723SJan Kara int ret; 655ceed1723SJan Kara 656ceed1723SJan Kara ret = dquot_writeback_dquots(sb, type); 657ceed1723SJan Kara if (ret) 658ceed1723SJan Kara return ret; 659ceed1723SJan Kara if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) 6605fb324adSChristoph Hellwig return 0; 6615fb324adSChristoph Hellwig 6625fb324adSChristoph Hellwig /* This is not very clever (and fast) but currently I don't know about 6635fb324adSChristoph Hellwig * any other simple way of getting quota data to disk and we must get 6645fb324adSChristoph Hellwig * them there for userspace to be visible... */ 6655fb324adSChristoph Hellwig if (sb->s_op->sync_fs) 6665fb324adSChristoph Hellwig sb->s_op->sync_fs(sb, 1); 6675fb324adSChristoph Hellwig sync_blockdev(sb->s_bdev); 6685fb324adSChristoph Hellwig 6695fb324adSChristoph Hellwig /* 6705fb324adSChristoph Hellwig * Now when everything is written we can discard the pagecache so 6715fb324adSChristoph Hellwig * that userspace sees the changes. 6725fb324adSChristoph Hellwig */ 673f9ef1784SJan Kara mutex_lock(&dqopt->dqonoff_mutex); 6745fb324adSChristoph Hellwig for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 6755fb324adSChristoph Hellwig if (type != -1 && cnt != type) 6765fb324adSChristoph Hellwig continue; 6775fb324adSChristoph Hellwig if (!sb_has_quota_active(sb, cnt)) 6785fb324adSChristoph Hellwig continue; 679a80b12c3SJan Kara mutex_lock(&dqopt->files[cnt]->i_mutex); 680f9ef1784SJan Kara truncate_inode_pages(&dqopt->files[cnt]->i_data, 0); 681f9ef1784SJan Kara mutex_unlock(&dqopt->files[cnt]->i_mutex); 6825fb324adSChristoph Hellwig } 683f9ef1784SJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 6845fb324adSChristoph Hellwig 685884d179dSJan Kara return 0; 686884d179dSJan Kara } 687287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_quota_sync); 688884d179dSJan Kara 689884d179dSJan Kara /* Free unused dquots from cache */ 690884d179dSJan Kara static void prune_dqcache(int count) 691884d179dSJan Kara { 692884d179dSJan Kara struct list_head *head; 693884d179dSJan Kara struct dquot *dquot; 694884d179dSJan Kara 695884d179dSJan Kara head = free_dquots.prev; 696884d179dSJan Kara while (head != &free_dquots && count) { 697884d179dSJan Kara dquot = list_entry(head, struct dquot, dq_free); 698884d179dSJan Kara remove_dquot_hash(dquot); 699884d179dSJan Kara remove_free_dquot(dquot); 700884d179dSJan Kara remove_inuse(dquot); 701884d179dSJan Kara do_destroy_dquot(dquot); 702884d179dSJan Kara count--; 703884d179dSJan Kara head = free_dquots.prev; 704884d179dSJan Kara } 705884d179dSJan Kara } 706884d179dSJan Kara 707884d179dSJan Kara /* 708884d179dSJan Kara * This is called from kswapd when we think we need some 709884d179dSJan Kara * more memory 710884d179dSJan Kara */ 7111495f230SYing Han static int shrink_dqcache_memory(struct shrinker *shrink, 7121495f230SYing Han struct shrink_control *sc) 713884d179dSJan Kara { 7141495f230SYing Han int nr = sc->nr_to_scan; 7151495f230SYing Han 716884d179dSJan Kara if (nr) { 717884d179dSJan Kara spin_lock(&dq_list_lock); 718884d179dSJan Kara prune_dqcache(nr); 719884d179dSJan Kara spin_unlock(&dq_list_lock); 720884d179dSJan Kara } 721f32764bdSDmitry Monakhov return ((unsigned) 722f32764bdSDmitry Monakhov percpu_counter_read_positive(&dqstats.counter[DQST_FREE_DQUOTS]) 723f32764bdSDmitry Monakhov /100) * sysctl_vfs_cache_pressure; 724884d179dSJan Kara } 725884d179dSJan Kara 726884d179dSJan Kara static struct shrinker dqcache_shrinker = { 727884d179dSJan Kara .shrink = shrink_dqcache_memory, 728884d179dSJan Kara .seeks = DEFAULT_SEEKS, 729884d179dSJan Kara }; 730884d179dSJan Kara 731884d179dSJan Kara /* 732884d179dSJan Kara * Put reference to dquot 733884d179dSJan Kara * NOTE: If you change this function please check whether dqput_blocks() works right... 734884d179dSJan Kara */ 735884d179dSJan Kara void dqput(struct dquot *dquot) 736884d179dSJan Kara { 737884d179dSJan Kara int ret; 738884d179dSJan Kara 739884d179dSJan Kara if (!dquot) 740884d179dSJan Kara return; 74162af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 742884d179dSJan Kara if (!atomic_read(&dquot->dq_count)) { 743fb5ffb0eSJiaying Zhang quota_error(dquot->dq_sb, "trying to free free dquot of %s %d", 744fb5ffb0eSJiaying Zhang quotatypes[dquot->dq_type], dquot->dq_id); 745884d179dSJan Kara BUG(); 746884d179dSJan Kara } 747884d179dSJan Kara #endif 748dde95888SDmitry Monakhov dqstats_inc(DQST_DROPS); 749884d179dSJan Kara we_slept: 750884d179dSJan Kara spin_lock(&dq_list_lock); 751884d179dSJan Kara if (atomic_read(&dquot->dq_count) > 1) { 752884d179dSJan Kara /* We have more than one user... nothing to do */ 753884d179dSJan Kara atomic_dec(&dquot->dq_count); 754884d179dSJan Kara /* Releasing dquot during quotaoff phase? */ 755884d179dSJan Kara if (!sb_has_quota_active(dquot->dq_sb, dquot->dq_type) && 756884d179dSJan Kara atomic_read(&dquot->dq_count) == 1) 757884d179dSJan Kara wake_up(&dquot->dq_wait_unused); 758884d179dSJan Kara spin_unlock(&dq_list_lock); 759884d179dSJan Kara return; 760884d179dSJan Kara } 761884d179dSJan Kara /* Need to release dquot? */ 762884d179dSJan Kara if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && dquot_dirty(dquot)) { 763884d179dSJan Kara spin_unlock(&dq_list_lock); 764884d179dSJan Kara /* Commit dquot before releasing */ 765884d179dSJan Kara ret = dquot->dq_sb->dq_op->write_dquot(dquot); 766884d179dSJan Kara if (ret < 0) { 767fb5ffb0eSJiaying Zhang quota_error(dquot->dq_sb, "Can't write quota structure" 768fb5ffb0eSJiaying Zhang " (error %d). Quota may get out of sync!", 769fb5ffb0eSJiaying Zhang ret); 770884d179dSJan Kara /* 771884d179dSJan Kara * We clear dirty bit anyway, so that we avoid 772884d179dSJan Kara * infinite loop here 773884d179dSJan Kara */ 774884d179dSJan Kara spin_lock(&dq_list_lock); 775884d179dSJan Kara clear_dquot_dirty(dquot); 776884d179dSJan Kara spin_unlock(&dq_list_lock); 777884d179dSJan Kara } 778884d179dSJan Kara goto we_slept; 779884d179dSJan Kara } 780884d179dSJan Kara /* Clear flag in case dquot was inactive (something bad happened) */ 781884d179dSJan Kara clear_dquot_dirty(dquot); 782884d179dSJan Kara if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { 783884d179dSJan Kara spin_unlock(&dq_list_lock); 784884d179dSJan Kara dquot->dq_sb->dq_op->release_dquot(dquot); 785884d179dSJan Kara goto we_slept; 786884d179dSJan Kara } 787884d179dSJan Kara atomic_dec(&dquot->dq_count); 78862af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 789884d179dSJan Kara /* sanity check */ 790884d179dSJan Kara BUG_ON(!list_empty(&dquot->dq_free)); 791884d179dSJan Kara #endif 792884d179dSJan Kara put_dquot_last(dquot); 793884d179dSJan Kara spin_unlock(&dq_list_lock); 794884d179dSJan Kara } 795884d179dSJan Kara EXPORT_SYMBOL(dqput); 796884d179dSJan Kara 797884d179dSJan Kara struct dquot *dquot_alloc(struct super_block *sb, int type) 798884d179dSJan Kara { 799884d179dSJan Kara return kmem_cache_zalloc(dquot_cachep, GFP_NOFS); 800884d179dSJan Kara } 801884d179dSJan Kara EXPORT_SYMBOL(dquot_alloc); 802884d179dSJan Kara 803884d179dSJan Kara static struct dquot *get_empty_dquot(struct super_block *sb, int type) 804884d179dSJan Kara { 805884d179dSJan Kara struct dquot *dquot; 806884d179dSJan Kara 807884d179dSJan Kara dquot = sb->dq_op->alloc_dquot(sb, type); 808884d179dSJan Kara if(!dquot) 809dd6f3c6dSJan Kara return NULL; 810884d179dSJan Kara 811884d179dSJan Kara mutex_init(&dquot->dq_lock); 812884d179dSJan Kara INIT_LIST_HEAD(&dquot->dq_free); 813884d179dSJan Kara INIT_LIST_HEAD(&dquot->dq_inuse); 814884d179dSJan Kara INIT_HLIST_NODE(&dquot->dq_hash); 815884d179dSJan Kara INIT_LIST_HEAD(&dquot->dq_dirty); 816884d179dSJan Kara init_waitqueue_head(&dquot->dq_wait_unused); 817884d179dSJan Kara dquot->dq_sb = sb; 818884d179dSJan Kara dquot->dq_type = type; 819884d179dSJan Kara atomic_set(&dquot->dq_count, 1); 820884d179dSJan Kara 821884d179dSJan Kara return dquot; 822884d179dSJan Kara } 823884d179dSJan Kara 824884d179dSJan Kara /* 825884d179dSJan Kara * Get reference to dquot 826884d179dSJan Kara * 827884d179dSJan Kara * Locking is slightly tricky here. We are guarded from parallel quotaoff() 828884d179dSJan Kara * destroying our dquot by: 829884d179dSJan Kara * a) checking for quota flags under dq_list_lock and 830884d179dSJan Kara * b) getting a reference to dquot before we release dq_list_lock 831884d179dSJan Kara */ 832884d179dSJan Kara struct dquot *dqget(struct super_block *sb, unsigned int id, int type) 833884d179dSJan Kara { 834884d179dSJan Kara unsigned int hashent = hashfn(sb, id, type); 835dd6f3c6dSJan Kara struct dquot *dquot = NULL, *empty = NULL; 836884d179dSJan Kara 837884d179dSJan Kara if (!sb_has_quota_active(sb, type)) 838dd6f3c6dSJan Kara return NULL; 839884d179dSJan Kara we_slept: 840884d179dSJan Kara spin_lock(&dq_list_lock); 841884d179dSJan Kara spin_lock(&dq_state_lock); 842884d179dSJan Kara if (!sb_has_quota_active(sb, type)) { 843884d179dSJan Kara spin_unlock(&dq_state_lock); 844884d179dSJan Kara spin_unlock(&dq_list_lock); 845884d179dSJan Kara goto out; 846884d179dSJan Kara } 847884d179dSJan Kara spin_unlock(&dq_state_lock); 848884d179dSJan Kara 849dd6f3c6dSJan Kara dquot = find_dquot(hashent, sb, id, type); 850dd6f3c6dSJan Kara if (!dquot) { 851dd6f3c6dSJan Kara if (!empty) { 852884d179dSJan Kara spin_unlock(&dq_list_lock); 853dd6f3c6dSJan Kara empty = get_empty_dquot(sb, type); 854dd6f3c6dSJan Kara if (!empty) 855884d179dSJan Kara schedule(); /* Try to wait for a moment... */ 856884d179dSJan Kara goto we_slept; 857884d179dSJan Kara } 858884d179dSJan Kara dquot = empty; 859dd6f3c6dSJan Kara empty = NULL; 860884d179dSJan Kara dquot->dq_id = id; 861884d179dSJan Kara /* all dquots go on the inuse_list */ 862884d179dSJan Kara put_inuse(dquot); 863884d179dSJan Kara /* hash it first so it can be found */ 864884d179dSJan Kara insert_dquot_hash(dquot); 865884d179dSJan Kara spin_unlock(&dq_list_lock); 866dde95888SDmitry Monakhov dqstats_inc(DQST_LOOKUPS); 867884d179dSJan Kara } else { 868884d179dSJan Kara if (!atomic_read(&dquot->dq_count)) 869884d179dSJan Kara remove_free_dquot(dquot); 870884d179dSJan Kara atomic_inc(&dquot->dq_count); 871884d179dSJan Kara spin_unlock(&dq_list_lock); 872dde95888SDmitry Monakhov dqstats_inc(DQST_CACHE_HITS); 873dde95888SDmitry Monakhov dqstats_inc(DQST_LOOKUPS); 874884d179dSJan Kara } 875268157baSJan Kara /* Wait for dq_lock - after this we know that either dquot_release() is 876268157baSJan Kara * already finished or it will be canceled due to dq_count > 1 test */ 877884d179dSJan Kara wait_on_dquot(dquot); 878268157baSJan Kara /* Read the dquot / allocate space in quota file */ 879268157baSJan Kara if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && 880268157baSJan Kara sb->dq_op->acquire_dquot(dquot) < 0) { 881884d179dSJan Kara dqput(dquot); 882dd6f3c6dSJan Kara dquot = NULL; 883884d179dSJan Kara goto out; 884884d179dSJan Kara } 88562af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 886884d179dSJan Kara BUG_ON(!dquot->dq_sb); /* Has somebody invalidated entry under us? */ 887884d179dSJan Kara #endif 888884d179dSJan Kara out: 889884d179dSJan Kara if (empty) 890884d179dSJan Kara do_destroy_dquot(empty); 891884d179dSJan Kara 892884d179dSJan Kara return dquot; 893884d179dSJan Kara } 894884d179dSJan Kara EXPORT_SYMBOL(dqget); 895884d179dSJan Kara 896884d179dSJan Kara static int dqinit_needed(struct inode *inode, int type) 897884d179dSJan Kara { 898884d179dSJan Kara int cnt; 899884d179dSJan Kara 900884d179dSJan Kara if (IS_NOQUOTA(inode)) 901884d179dSJan Kara return 0; 902884d179dSJan Kara if (type != -1) 903dd6f3c6dSJan Kara return !inode->i_dquot[type]; 904884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 905dd6f3c6dSJan Kara if (!inode->i_dquot[cnt]) 906884d179dSJan Kara return 1; 907884d179dSJan Kara return 0; 908884d179dSJan Kara } 909884d179dSJan Kara 910884d179dSJan Kara /* This routine is guarded by dqonoff_mutex mutex */ 911884d179dSJan Kara static void add_dquot_ref(struct super_block *sb, int type) 912884d179dSJan Kara { 913884d179dSJan Kara struct inode *inode, *old_inode = NULL; 91462af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 9150a5a9c72SJan Kara int reserved = 0; 9164c5e6c0eSJan Kara #endif 917884d179dSJan Kara 91855fa6091SDave Chinner spin_lock(&inode_sb_list_lock); 919884d179dSJan Kara list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { 920250df6edSDave Chinner spin_lock(&inode->i_lock); 921250df6edSDave Chinner if ((inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW)) || 922250df6edSDave Chinner !atomic_read(&inode->i_writecount) || 923250df6edSDave Chinner !dqinit_needed(inode, type)) { 924250df6edSDave Chinner spin_unlock(&inode->i_lock); 9253ae5080fSLinus Torvalds continue; 926250df6edSDave Chinner } 927884d179dSJan Kara __iget(inode); 928250df6edSDave Chinner spin_unlock(&inode->i_lock); 92955fa6091SDave Chinner spin_unlock(&inode_sb_list_lock); 930884d179dSJan Kara 931d7e97117SJan Kara #ifdef CONFIG_QUOTA_DEBUG 932d7e97117SJan Kara if (unlikely(inode_get_rsv_space(inode) > 0)) 933d7e97117SJan Kara reserved = 1; 934d7e97117SJan Kara #endif 935884d179dSJan Kara iput(old_inode); 936871a2931SChristoph Hellwig __dquot_initialize(inode, type); 93755fa6091SDave Chinner 93855fa6091SDave Chinner /* 93955fa6091SDave Chinner * We hold a reference to 'inode' so it couldn't have been 94055fa6091SDave Chinner * removed from s_inodes list while we dropped the 94155fa6091SDave Chinner * inode_sb_list_lock We cannot iput the inode now as we can be 94255fa6091SDave Chinner * holding the last reference and we cannot iput it under 94355fa6091SDave Chinner * inode_sb_list_lock. So we keep the reference and iput it 94455fa6091SDave Chinner * later. 94555fa6091SDave Chinner */ 946884d179dSJan Kara old_inode = inode; 94755fa6091SDave Chinner spin_lock(&inode_sb_list_lock); 948884d179dSJan Kara } 94955fa6091SDave Chinner spin_unlock(&inode_sb_list_lock); 950884d179dSJan Kara iput(old_inode); 9510a5a9c72SJan Kara 95262af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 9530a5a9c72SJan Kara if (reserved) { 954fb5ffb0eSJiaying Zhang quota_error(sb, "Writes happened before quota was turned on " 955fb5ffb0eSJiaying Zhang "thus quota information is probably inconsistent. " 956fb5ffb0eSJiaying Zhang "Please run quotacheck(8)"); 9570a5a9c72SJan Kara } 9584c5e6c0eSJan Kara #endif 959884d179dSJan Kara } 960884d179dSJan Kara 961268157baSJan Kara /* 962268157baSJan Kara * Return 0 if dqput() won't block. 963268157baSJan Kara * (note that 1 doesn't necessarily mean blocking) 964268157baSJan Kara */ 965884d179dSJan Kara static inline int dqput_blocks(struct dquot *dquot) 966884d179dSJan Kara { 967884d179dSJan Kara if (atomic_read(&dquot->dq_count) <= 1) 968884d179dSJan Kara return 1; 969884d179dSJan Kara return 0; 970884d179dSJan Kara } 971884d179dSJan Kara 972268157baSJan Kara /* 973268157baSJan Kara * Remove references to dquots from inode and add dquot to list for freeing 97425985edcSLucas De Marchi * if we have the last reference to dquot 975268157baSJan Kara * We can't race with anybody because we hold dqptr_sem for writing... 976268157baSJan Kara */ 977884d179dSJan Kara static int remove_inode_dquot_ref(struct inode *inode, int type, 978884d179dSJan Kara struct list_head *tofree_head) 979884d179dSJan Kara { 980884d179dSJan Kara struct dquot *dquot = inode->i_dquot[type]; 981884d179dSJan Kara 982dd6f3c6dSJan Kara inode->i_dquot[type] = NULL; 983dd6f3c6dSJan Kara if (dquot) { 984884d179dSJan Kara if (dqput_blocks(dquot)) { 98562af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 986884d179dSJan Kara if (atomic_read(&dquot->dq_count) != 1) 987fb5ffb0eSJiaying Zhang quota_error(inode->i_sb, "Adding dquot with " 988fb5ffb0eSJiaying Zhang "dq_count %d to dispose list", 989fb5ffb0eSJiaying Zhang atomic_read(&dquot->dq_count)); 990884d179dSJan Kara #endif 991884d179dSJan Kara spin_lock(&dq_list_lock); 992268157baSJan Kara /* As dquot must have currently users it can't be on 993268157baSJan Kara * the free list... */ 994268157baSJan Kara list_add(&dquot->dq_free, tofree_head); 995884d179dSJan Kara spin_unlock(&dq_list_lock); 996884d179dSJan Kara return 1; 997884d179dSJan Kara } 998884d179dSJan Kara else 999884d179dSJan Kara dqput(dquot); /* We have guaranteed we won't block */ 1000884d179dSJan Kara } 1001884d179dSJan Kara return 0; 1002884d179dSJan Kara } 1003884d179dSJan Kara 1004268157baSJan Kara /* 1005268157baSJan Kara * Free list of dquots 1006268157baSJan Kara * Dquots are removed from inodes and no new references can be got so we are 1007268157baSJan Kara * the only ones holding reference 1008268157baSJan Kara */ 1009884d179dSJan Kara static void put_dquot_list(struct list_head *tofree_head) 1010884d179dSJan Kara { 1011884d179dSJan Kara struct list_head *act_head; 1012884d179dSJan Kara struct dquot *dquot; 1013884d179dSJan Kara 1014884d179dSJan Kara act_head = tofree_head->next; 1015884d179dSJan Kara while (act_head != tofree_head) { 1016884d179dSJan Kara dquot = list_entry(act_head, struct dquot, dq_free); 1017884d179dSJan Kara act_head = act_head->next; 1018268157baSJan Kara /* Remove dquot from the list so we won't have problems... */ 1019268157baSJan Kara list_del_init(&dquot->dq_free); 1020884d179dSJan Kara dqput(dquot); 1021884d179dSJan Kara } 1022884d179dSJan Kara } 1023884d179dSJan Kara 1024884d179dSJan Kara static void remove_dquot_ref(struct super_block *sb, int type, 1025884d179dSJan Kara struct list_head *tofree_head) 1026884d179dSJan Kara { 1027884d179dSJan Kara struct inode *inode; 10287af9cce8SDmitry Monakhov int reserved = 0; 1029884d179dSJan Kara 103055fa6091SDave Chinner spin_lock(&inode_sb_list_lock); 1031884d179dSJan Kara list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { 10323ae5080fSLinus Torvalds /* 10333ae5080fSLinus Torvalds * We have to scan also I_NEW inodes because they can already 10343ae5080fSLinus Torvalds * have quota pointer initialized. Luckily, we need to touch 10353ae5080fSLinus Torvalds * only quota pointers and these have separate locking 10363ae5080fSLinus Torvalds * (dqptr_sem). 10373ae5080fSLinus Torvalds */ 10387af9cce8SDmitry Monakhov if (!IS_NOQUOTA(inode)) { 10397af9cce8SDmitry Monakhov if (unlikely(inode_get_rsv_space(inode) > 0)) 10407af9cce8SDmitry Monakhov reserved = 1; 1041884d179dSJan Kara remove_inode_dquot_ref(inode, type, tofree_head); 1042884d179dSJan Kara } 10437af9cce8SDmitry Monakhov } 104455fa6091SDave Chinner spin_unlock(&inode_sb_list_lock); 10457af9cce8SDmitry Monakhov #ifdef CONFIG_QUOTA_DEBUG 10467af9cce8SDmitry Monakhov if (reserved) { 10477af9cce8SDmitry Monakhov printk(KERN_WARNING "VFS (%s): Writes happened after quota" 10487af9cce8SDmitry Monakhov " was disabled thus quota information is probably " 10497af9cce8SDmitry Monakhov "inconsistent. Please run quotacheck(8).\n", sb->s_id); 10507af9cce8SDmitry Monakhov } 10517af9cce8SDmitry Monakhov #endif 1052884d179dSJan Kara } 1053884d179dSJan Kara 1054884d179dSJan Kara /* Gather all references from inodes and drop them */ 1055884d179dSJan Kara static void drop_dquot_ref(struct super_block *sb, int type) 1056884d179dSJan Kara { 1057884d179dSJan Kara LIST_HEAD(tofree_head); 1058884d179dSJan Kara 1059884d179dSJan Kara if (sb->dq_op) { 1060884d179dSJan Kara down_write(&sb_dqopt(sb)->dqptr_sem); 1061884d179dSJan Kara remove_dquot_ref(sb, type, &tofree_head); 1062884d179dSJan Kara up_write(&sb_dqopt(sb)->dqptr_sem); 1063884d179dSJan Kara put_dquot_list(&tofree_head); 1064884d179dSJan Kara } 1065884d179dSJan Kara } 1066884d179dSJan Kara 1067884d179dSJan Kara static inline void dquot_incr_inodes(struct dquot *dquot, qsize_t number) 1068884d179dSJan Kara { 1069884d179dSJan Kara dquot->dq_dqb.dqb_curinodes += number; 1070884d179dSJan Kara } 1071884d179dSJan Kara 1072884d179dSJan Kara static inline void dquot_incr_space(struct dquot *dquot, qsize_t number) 1073884d179dSJan Kara { 1074884d179dSJan Kara dquot->dq_dqb.dqb_curspace += number; 1075884d179dSJan Kara } 1076884d179dSJan Kara 1077884d179dSJan Kara static inline void dquot_resv_space(struct dquot *dquot, qsize_t number) 1078884d179dSJan Kara { 1079884d179dSJan Kara dquot->dq_dqb.dqb_rsvspace += number; 1080884d179dSJan Kara } 1081884d179dSJan Kara 1082884d179dSJan Kara /* 1083884d179dSJan Kara * Claim reserved quota space 1084884d179dSJan Kara */ 10850a5a9c72SJan Kara static void dquot_claim_reserved_space(struct dquot *dquot, qsize_t number) 1086884d179dSJan Kara { 10870a5a9c72SJan Kara if (dquot->dq_dqb.dqb_rsvspace < number) { 10880a5a9c72SJan Kara WARN_ON_ONCE(1); 10890a5a9c72SJan Kara number = dquot->dq_dqb.dqb_rsvspace; 10900a5a9c72SJan Kara } 1091884d179dSJan Kara dquot->dq_dqb.dqb_curspace += number; 1092884d179dSJan Kara dquot->dq_dqb.dqb_rsvspace -= number; 1093884d179dSJan Kara } 1094884d179dSJan Kara 1095884d179dSJan Kara static inline 1096884d179dSJan Kara void dquot_free_reserved_space(struct dquot *dquot, qsize_t number) 1097884d179dSJan Kara { 10980a5a9c72SJan Kara if (dquot->dq_dqb.dqb_rsvspace >= number) 1099884d179dSJan Kara dquot->dq_dqb.dqb_rsvspace -= number; 11000a5a9c72SJan Kara else { 11010a5a9c72SJan Kara WARN_ON_ONCE(1); 11020a5a9c72SJan Kara dquot->dq_dqb.dqb_rsvspace = 0; 11030a5a9c72SJan Kara } 1104884d179dSJan Kara } 1105884d179dSJan Kara 11067a2435d8SJan Kara static void dquot_decr_inodes(struct dquot *dquot, qsize_t number) 1107884d179dSJan Kara { 1108884d179dSJan Kara if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE || 1109884d179dSJan Kara dquot->dq_dqb.dqb_curinodes >= number) 1110884d179dSJan Kara dquot->dq_dqb.dqb_curinodes -= number; 1111884d179dSJan Kara else 1112884d179dSJan Kara dquot->dq_dqb.dqb_curinodes = 0; 1113884d179dSJan Kara if (dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit) 1114884d179dSJan Kara dquot->dq_dqb.dqb_itime = (time_t) 0; 1115884d179dSJan Kara clear_bit(DQ_INODES_B, &dquot->dq_flags); 1116884d179dSJan Kara } 1117884d179dSJan Kara 11187a2435d8SJan Kara static void dquot_decr_space(struct dquot *dquot, qsize_t number) 1119884d179dSJan Kara { 1120884d179dSJan Kara if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE || 1121884d179dSJan Kara dquot->dq_dqb.dqb_curspace >= number) 1122884d179dSJan Kara dquot->dq_dqb.dqb_curspace -= number; 1123884d179dSJan Kara else 1124884d179dSJan Kara dquot->dq_dqb.dqb_curspace = 0; 1125884d179dSJan Kara if (dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit) 1126884d179dSJan Kara dquot->dq_dqb.dqb_btime = (time_t) 0; 1127884d179dSJan Kara clear_bit(DQ_BLKS_B, &dquot->dq_flags); 1128884d179dSJan Kara } 1129884d179dSJan Kara 1130bf097aafSJan Kara struct dquot_warn { 1131bf097aafSJan Kara struct super_block *w_sb; 1132bf097aafSJan Kara qid_t w_dq_id; 1133bf097aafSJan Kara short w_dq_type; 1134bf097aafSJan Kara short w_type; 1135bf097aafSJan Kara }; 1136bf097aafSJan Kara 1137884d179dSJan Kara static int warning_issued(struct dquot *dquot, const int warntype) 1138884d179dSJan Kara { 1139884d179dSJan Kara int flag = (warntype == QUOTA_NL_BHARDWARN || 1140884d179dSJan Kara warntype == QUOTA_NL_BSOFTLONGWARN) ? DQ_BLKS_B : 1141884d179dSJan Kara ((warntype == QUOTA_NL_IHARDWARN || 1142884d179dSJan Kara warntype == QUOTA_NL_ISOFTLONGWARN) ? DQ_INODES_B : 0); 1143884d179dSJan Kara 1144884d179dSJan Kara if (!flag) 1145884d179dSJan Kara return 0; 1146884d179dSJan Kara return test_and_set_bit(flag, &dquot->dq_flags); 1147884d179dSJan Kara } 1148884d179dSJan Kara 1149884d179dSJan Kara #ifdef CONFIG_PRINT_QUOTA_WARNING 1150884d179dSJan Kara static int flag_print_warnings = 1; 1151884d179dSJan Kara 1152bf097aafSJan Kara static int need_print_warning(struct dquot_warn *warn) 1153884d179dSJan Kara { 1154884d179dSJan Kara if (!flag_print_warnings) 1155884d179dSJan Kara return 0; 1156884d179dSJan Kara 1157bf097aafSJan Kara switch (warn->w_dq_type) { 1158884d179dSJan Kara case USRQUOTA: 1159bf097aafSJan Kara return current_fsuid() == warn->w_dq_id; 1160884d179dSJan Kara case GRPQUOTA: 1161bf097aafSJan Kara return in_group_p(warn->w_dq_id); 1162884d179dSJan Kara } 1163884d179dSJan Kara return 0; 1164884d179dSJan Kara } 1165884d179dSJan Kara 1166884d179dSJan Kara /* Print warning to user which exceeded quota */ 1167bf097aafSJan Kara static void print_warning(struct dquot_warn *warn) 1168884d179dSJan Kara { 1169884d179dSJan Kara char *msg = NULL; 1170884d179dSJan Kara struct tty_struct *tty; 1171bf097aafSJan Kara int warntype = warn->w_type; 1172884d179dSJan Kara 1173884d179dSJan Kara if (warntype == QUOTA_NL_IHARDBELOW || 1174884d179dSJan Kara warntype == QUOTA_NL_ISOFTBELOW || 1175884d179dSJan Kara warntype == QUOTA_NL_BHARDBELOW || 1176bf097aafSJan Kara warntype == QUOTA_NL_BSOFTBELOW || !need_print_warning(warn)) 1177884d179dSJan Kara return; 1178884d179dSJan Kara 1179884d179dSJan Kara tty = get_current_tty(); 1180884d179dSJan Kara if (!tty) 1181884d179dSJan Kara return; 1182bf097aafSJan Kara tty_write_message(tty, warn->w_sb->s_id); 1183884d179dSJan Kara if (warntype == QUOTA_NL_ISOFTWARN || warntype == QUOTA_NL_BSOFTWARN) 1184884d179dSJan Kara tty_write_message(tty, ": warning, "); 1185884d179dSJan Kara else 1186884d179dSJan Kara tty_write_message(tty, ": write failed, "); 1187bf097aafSJan Kara tty_write_message(tty, quotatypes[warn->w_dq_type]); 1188884d179dSJan Kara switch (warntype) { 1189884d179dSJan Kara case QUOTA_NL_IHARDWARN: 1190884d179dSJan Kara msg = " file limit reached.\r\n"; 1191884d179dSJan Kara break; 1192884d179dSJan Kara case QUOTA_NL_ISOFTLONGWARN: 1193884d179dSJan Kara msg = " file quota exceeded too long.\r\n"; 1194884d179dSJan Kara break; 1195884d179dSJan Kara case QUOTA_NL_ISOFTWARN: 1196884d179dSJan Kara msg = " file quota exceeded.\r\n"; 1197884d179dSJan Kara break; 1198884d179dSJan Kara case QUOTA_NL_BHARDWARN: 1199884d179dSJan Kara msg = " block limit reached.\r\n"; 1200884d179dSJan Kara break; 1201884d179dSJan Kara case QUOTA_NL_BSOFTLONGWARN: 1202884d179dSJan Kara msg = " block quota exceeded too long.\r\n"; 1203884d179dSJan Kara break; 1204884d179dSJan Kara case QUOTA_NL_BSOFTWARN: 1205884d179dSJan Kara msg = " block quota exceeded.\r\n"; 1206884d179dSJan Kara break; 1207884d179dSJan Kara } 1208884d179dSJan Kara tty_write_message(tty, msg); 1209884d179dSJan Kara tty_kref_put(tty); 1210884d179dSJan Kara } 1211884d179dSJan Kara #endif 1212884d179dSJan Kara 1213bf097aafSJan Kara static void prepare_warning(struct dquot_warn *warn, struct dquot *dquot, 1214bf097aafSJan Kara int warntype) 1215bf097aafSJan Kara { 1216bf097aafSJan Kara if (warning_issued(dquot, warntype)) 1217bf097aafSJan Kara return; 1218bf097aafSJan Kara warn->w_type = warntype; 1219bf097aafSJan Kara warn->w_sb = dquot->dq_sb; 1220bf097aafSJan Kara warn->w_dq_id = dquot->dq_id; 1221bf097aafSJan Kara warn->w_dq_type = dquot->dq_type; 1222bf097aafSJan Kara } 1223bf097aafSJan Kara 1224884d179dSJan Kara /* 1225884d179dSJan Kara * Write warnings to the console and send warning messages over netlink. 1226884d179dSJan Kara * 1227bf097aafSJan Kara * Note that this function can call into tty and networking code. 1228884d179dSJan Kara */ 1229bf097aafSJan Kara static void flush_warnings(struct dquot_warn *warn) 1230884d179dSJan Kara { 1231884d179dSJan Kara int i; 1232884d179dSJan Kara 123386e931a3SSteven Whitehouse for (i = 0; i < MAXQUOTAS; i++) { 1234bf097aafSJan Kara if (warn[i].w_type == QUOTA_NL_NOWARN) 1235bf097aafSJan Kara continue; 1236884d179dSJan Kara #ifdef CONFIG_PRINT_QUOTA_WARNING 1237bf097aafSJan Kara print_warning(&warn[i]); 1238884d179dSJan Kara #endif 1239bf097aafSJan Kara quota_send_warning(warn[i].w_dq_type, warn[i].w_dq_id, 1240bf097aafSJan Kara warn[i].w_sb->s_dev, warn[i].w_type); 1241884d179dSJan Kara } 1242884d179dSJan Kara } 1243884d179dSJan Kara 12447a2435d8SJan Kara static int ignore_hardlimit(struct dquot *dquot) 1245884d179dSJan Kara { 1246884d179dSJan Kara struct mem_dqinfo *info = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_type]; 1247884d179dSJan Kara 1248884d179dSJan Kara return capable(CAP_SYS_RESOURCE) && 1249268157baSJan Kara (info->dqi_format->qf_fmt_id != QFMT_VFS_OLD || 1250268157baSJan Kara !(info->dqi_flags & V1_DQF_RSQUASH)); 1251884d179dSJan Kara } 1252884d179dSJan Kara 1253884d179dSJan Kara /* needs dq_data_lock */ 1254bf097aafSJan Kara static int check_idq(struct dquot *dquot, qsize_t inodes, 1255bf097aafSJan Kara struct dquot_warn *warn) 1256884d179dSJan Kara { 1257268157baSJan Kara qsize_t newinodes = dquot->dq_dqb.dqb_curinodes + inodes; 1258268157baSJan Kara 1259884d179dSJan Kara if (!sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_type) || 1260884d179dSJan Kara test_bit(DQ_FAKE_B, &dquot->dq_flags)) 1261efd8f0e6SChristoph Hellwig return 0; 1262884d179dSJan Kara 1263884d179dSJan Kara if (dquot->dq_dqb.dqb_ihardlimit && 1264268157baSJan Kara newinodes > dquot->dq_dqb.dqb_ihardlimit && 1265884d179dSJan Kara !ignore_hardlimit(dquot)) { 1266bf097aafSJan Kara prepare_warning(warn, dquot, QUOTA_NL_IHARDWARN); 1267efd8f0e6SChristoph Hellwig return -EDQUOT; 1268884d179dSJan Kara } 1269884d179dSJan Kara 1270884d179dSJan Kara if (dquot->dq_dqb.dqb_isoftlimit && 1271268157baSJan Kara newinodes > dquot->dq_dqb.dqb_isoftlimit && 1272268157baSJan Kara dquot->dq_dqb.dqb_itime && 1273268157baSJan Kara get_seconds() >= dquot->dq_dqb.dqb_itime && 1274884d179dSJan Kara !ignore_hardlimit(dquot)) { 1275bf097aafSJan Kara prepare_warning(warn, dquot, QUOTA_NL_ISOFTLONGWARN); 1276efd8f0e6SChristoph Hellwig return -EDQUOT; 1277884d179dSJan Kara } 1278884d179dSJan Kara 1279884d179dSJan Kara if (dquot->dq_dqb.dqb_isoftlimit && 1280268157baSJan Kara newinodes > dquot->dq_dqb.dqb_isoftlimit && 1281884d179dSJan Kara dquot->dq_dqb.dqb_itime == 0) { 1282bf097aafSJan Kara prepare_warning(warn, dquot, QUOTA_NL_ISOFTWARN); 1283268157baSJan Kara dquot->dq_dqb.dqb_itime = get_seconds() + 1284268157baSJan Kara sb_dqopt(dquot->dq_sb)->info[dquot->dq_type].dqi_igrace; 1285884d179dSJan Kara } 1286884d179dSJan Kara 1287efd8f0e6SChristoph Hellwig return 0; 1288884d179dSJan Kara } 1289884d179dSJan Kara 1290884d179dSJan Kara /* needs dq_data_lock */ 1291bf097aafSJan Kara static int check_bdq(struct dquot *dquot, qsize_t space, int prealloc, 1292bf097aafSJan Kara struct dquot_warn *warn) 1293884d179dSJan Kara { 1294884d179dSJan Kara qsize_t tspace; 1295268157baSJan Kara struct super_block *sb = dquot->dq_sb; 1296884d179dSJan Kara 1297268157baSJan Kara if (!sb_has_quota_limits_enabled(sb, dquot->dq_type) || 1298884d179dSJan Kara test_bit(DQ_FAKE_B, &dquot->dq_flags)) 1299efd8f0e6SChristoph Hellwig return 0; 1300884d179dSJan Kara 1301884d179dSJan Kara tspace = dquot->dq_dqb.dqb_curspace + dquot->dq_dqb.dqb_rsvspace 1302884d179dSJan Kara + space; 1303884d179dSJan Kara 1304884d179dSJan Kara if (dquot->dq_dqb.dqb_bhardlimit && 1305884d179dSJan Kara tspace > dquot->dq_dqb.dqb_bhardlimit && 1306884d179dSJan Kara !ignore_hardlimit(dquot)) { 1307884d179dSJan Kara if (!prealloc) 1308bf097aafSJan Kara prepare_warning(warn, dquot, QUOTA_NL_BHARDWARN); 1309efd8f0e6SChristoph Hellwig return -EDQUOT; 1310884d179dSJan Kara } 1311884d179dSJan Kara 1312884d179dSJan Kara if (dquot->dq_dqb.dqb_bsoftlimit && 1313884d179dSJan Kara tspace > dquot->dq_dqb.dqb_bsoftlimit && 1314268157baSJan Kara dquot->dq_dqb.dqb_btime && 1315268157baSJan Kara get_seconds() >= dquot->dq_dqb.dqb_btime && 1316884d179dSJan Kara !ignore_hardlimit(dquot)) { 1317884d179dSJan Kara if (!prealloc) 1318bf097aafSJan Kara prepare_warning(warn, dquot, QUOTA_NL_BSOFTLONGWARN); 1319efd8f0e6SChristoph Hellwig return -EDQUOT; 1320884d179dSJan Kara } 1321884d179dSJan Kara 1322884d179dSJan Kara if (dquot->dq_dqb.dqb_bsoftlimit && 1323884d179dSJan Kara tspace > dquot->dq_dqb.dqb_bsoftlimit && 1324884d179dSJan Kara dquot->dq_dqb.dqb_btime == 0) { 1325884d179dSJan Kara if (!prealloc) { 1326bf097aafSJan Kara prepare_warning(warn, dquot, QUOTA_NL_BSOFTWARN); 1327268157baSJan Kara dquot->dq_dqb.dqb_btime = get_seconds() + 1328268157baSJan Kara sb_dqopt(sb)->info[dquot->dq_type].dqi_bgrace; 1329884d179dSJan Kara } 1330884d179dSJan Kara else 1331884d179dSJan Kara /* 1332884d179dSJan Kara * We don't allow preallocation to exceed softlimit so exceeding will 1333884d179dSJan Kara * be always printed 1334884d179dSJan Kara */ 1335efd8f0e6SChristoph Hellwig return -EDQUOT; 1336884d179dSJan Kara } 1337884d179dSJan Kara 1338efd8f0e6SChristoph Hellwig return 0; 1339884d179dSJan Kara } 1340884d179dSJan Kara 1341884d179dSJan Kara static int info_idq_free(struct dquot *dquot, qsize_t inodes) 1342884d179dSJan Kara { 1343268157baSJan Kara qsize_t newinodes; 1344268157baSJan Kara 1345884d179dSJan Kara if (test_bit(DQ_FAKE_B, &dquot->dq_flags) || 1346884d179dSJan Kara dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit || 1347884d179dSJan Kara !sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_type)) 1348884d179dSJan Kara return QUOTA_NL_NOWARN; 1349884d179dSJan Kara 1350268157baSJan Kara newinodes = dquot->dq_dqb.dqb_curinodes - inodes; 1351268157baSJan Kara if (newinodes <= dquot->dq_dqb.dqb_isoftlimit) 1352884d179dSJan Kara return QUOTA_NL_ISOFTBELOW; 1353884d179dSJan Kara if (dquot->dq_dqb.dqb_curinodes >= dquot->dq_dqb.dqb_ihardlimit && 1354268157baSJan Kara newinodes < dquot->dq_dqb.dqb_ihardlimit) 1355884d179dSJan Kara return QUOTA_NL_IHARDBELOW; 1356884d179dSJan Kara return QUOTA_NL_NOWARN; 1357884d179dSJan Kara } 1358884d179dSJan Kara 1359884d179dSJan Kara static int info_bdq_free(struct dquot *dquot, qsize_t space) 1360884d179dSJan Kara { 1361884d179dSJan Kara if (test_bit(DQ_FAKE_B, &dquot->dq_flags) || 1362884d179dSJan Kara dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit) 1363884d179dSJan Kara return QUOTA_NL_NOWARN; 1364884d179dSJan Kara 1365884d179dSJan Kara if (dquot->dq_dqb.dqb_curspace - space <= dquot->dq_dqb.dqb_bsoftlimit) 1366884d179dSJan Kara return QUOTA_NL_BSOFTBELOW; 1367884d179dSJan Kara if (dquot->dq_dqb.dqb_curspace >= dquot->dq_dqb.dqb_bhardlimit && 1368884d179dSJan Kara dquot->dq_dqb.dqb_curspace - space < dquot->dq_dqb.dqb_bhardlimit) 1369884d179dSJan Kara return QUOTA_NL_BHARDBELOW; 1370884d179dSJan Kara return QUOTA_NL_NOWARN; 1371884d179dSJan Kara } 13720a5a9c72SJan Kara 1373189eef59SChristoph Hellwig static int dquot_active(const struct inode *inode) 1374189eef59SChristoph Hellwig { 1375189eef59SChristoph Hellwig struct super_block *sb = inode->i_sb; 1376189eef59SChristoph Hellwig 1377189eef59SChristoph Hellwig if (IS_NOQUOTA(inode)) 1378189eef59SChristoph Hellwig return 0; 1379189eef59SChristoph Hellwig return sb_any_quota_loaded(sb) & ~sb_any_quota_suspended(sb); 1380189eef59SChristoph Hellwig } 1381189eef59SChristoph Hellwig 1382884d179dSJan Kara /* 1383884d179dSJan Kara * Initialize quota pointers in inode 1384871a2931SChristoph Hellwig * 1385884d179dSJan Kara * We do things in a bit complicated way but by that we avoid calling 1386884d179dSJan Kara * dqget() and thus filesystem callbacks under dqptr_sem. 1387871a2931SChristoph Hellwig * 1388871a2931SChristoph Hellwig * It is better to call this function outside of any transaction as it 1389871a2931SChristoph Hellwig * might need a lot of space in journal for dquot structure allocation. 1390884d179dSJan Kara */ 1391871a2931SChristoph Hellwig static void __dquot_initialize(struct inode *inode, int type) 1392884d179dSJan Kara { 1393884d179dSJan Kara unsigned int id = 0; 1394871a2931SChristoph Hellwig int cnt; 1395ad1e6e8dSDmitry Monakhov struct dquot *got[MAXQUOTAS]; 1396884d179dSJan Kara struct super_block *sb = inode->i_sb; 13970a5a9c72SJan Kara qsize_t rsv; 1398884d179dSJan Kara 1399884d179dSJan Kara /* First test before acquiring mutex - solves deadlocks when we 1400884d179dSJan Kara * re-enter the quota code and are already holding the mutex */ 1401189eef59SChristoph Hellwig if (!dquot_active(inode)) 1402871a2931SChristoph Hellwig return; 1403884d179dSJan Kara 1404884d179dSJan Kara /* First get references to structures we might need. */ 1405884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1406ad1e6e8dSDmitry Monakhov got[cnt] = NULL; 1407884d179dSJan Kara if (type != -1 && cnt != type) 1408884d179dSJan Kara continue; 1409884d179dSJan Kara switch (cnt) { 1410884d179dSJan Kara case USRQUOTA: 1411884d179dSJan Kara id = inode->i_uid; 1412884d179dSJan Kara break; 1413884d179dSJan Kara case GRPQUOTA: 1414884d179dSJan Kara id = inode->i_gid; 1415884d179dSJan Kara break; 1416884d179dSJan Kara } 1417884d179dSJan Kara got[cnt] = dqget(sb, id, cnt); 1418884d179dSJan Kara } 1419884d179dSJan Kara 1420884d179dSJan Kara down_write(&sb_dqopt(sb)->dqptr_sem); 1421884d179dSJan Kara if (IS_NOQUOTA(inode)) 1422884d179dSJan Kara goto out_err; 1423884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1424884d179dSJan Kara if (type != -1 && cnt != type) 1425884d179dSJan Kara continue; 1426884d179dSJan Kara /* Avoid races with quotaoff() */ 1427884d179dSJan Kara if (!sb_has_quota_active(sb, cnt)) 1428884d179dSJan Kara continue; 14294408ea41SJan Kara /* We could race with quotaon or dqget() could have failed */ 14304408ea41SJan Kara if (!got[cnt]) 14314408ea41SJan Kara continue; 1432dd6f3c6dSJan Kara if (!inode->i_dquot[cnt]) { 1433884d179dSJan Kara inode->i_dquot[cnt] = got[cnt]; 1434dd6f3c6dSJan Kara got[cnt] = NULL; 14350a5a9c72SJan Kara /* 14360a5a9c72SJan Kara * Make quota reservation system happy if someone 14370a5a9c72SJan Kara * did a write before quota was turned on 14380a5a9c72SJan Kara */ 14390a5a9c72SJan Kara rsv = inode_get_rsv_space(inode); 14400a5a9c72SJan Kara if (unlikely(rsv)) 14410a5a9c72SJan Kara dquot_resv_space(inode->i_dquot[cnt], rsv); 1442884d179dSJan Kara } 1443884d179dSJan Kara } 1444884d179dSJan Kara out_err: 1445884d179dSJan Kara up_write(&sb_dqopt(sb)->dqptr_sem); 1446884d179dSJan Kara /* Drop unused references */ 1447dc52dd3aSDmitry Monakhov dqput_all(got); 1448871a2931SChristoph Hellwig } 1449871a2931SChristoph Hellwig 1450871a2931SChristoph Hellwig void dquot_initialize(struct inode *inode) 1451871a2931SChristoph Hellwig { 1452871a2931SChristoph Hellwig __dquot_initialize(inode, -1); 1453884d179dSJan Kara } 1454884d179dSJan Kara EXPORT_SYMBOL(dquot_initialize); 1455884d179dSJan Kara 1456884d179dSJan Kara /* 1457884d179dSJan Kara * Release all quotas referenced by inode 1458884d179dSJan Kara */ 14599f754758SChristoph Hellwig static void __dquot_drop(struct inode *inode) 1460884d179dSJan Kara { 1461884d179dSJan Kara int cnt; 1462884d179dSJan Kara struct dquot *put[MAXQUOTAS]; 1463884d179dSJan Kara 1464884d179dSJan Kara down_write(&sb_dqopt(inode->i_sb)->dqptr_sem); 1465884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1466884d179dSJan Kara put[cnt] = inode->i_dquot[cnt]; 1467dd6f3c6dSJan Kara inode->i_dquot[cnt] = NULL; 1468884d179dSJan Kara } 1469884d179dSJan Kara up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); 1470dc52dd3aSDmitry Monakhov dqput_all(put); 1471884d179dSJan Kara } 1472884d179dSJan Kara 14739f754758SChristoph Hellwig void dquot_drop(struct inode *inode) 1474884d179dSJan Kara { 1475884d179dSJan Kara int cnt; 14769f754758SChristoph Hellwig 14779f754758SChristoph Hellwig if (IS_NOQUOTA(inode)) 14789f754758SChristoph Hellwig return; 14799f754758SChristoph Hellwig 14809f754758SChristoph Hellwig /* 14819f754758SChristoph Hellwig * Test before calling to rule out calls from proc and such 1482884d179dSJan Kara * where we are not allowed to block. Note that this is 1483884d179dSJan Kara * actually reliable test even without the lock - the caller 1484884d179dSJan Kara * must assure that nobody can come after the DQUOT_DROP and 14859f754758SChristoph Hellwig * add quota pointers back anyway. 14869f754758SChristoph Hellwig */ 14879f754758SChristoph Hellwig for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1488dd6f3c6dSJan Kara if (inode->i_dquot[cnt]) 1489884d179dSJan Kara break; 14909f754758SChristoph Hellwig } 14919f754758SChristoph Hellwig 1492884d179dSJan Kara if (cnt < MAXQUOTAS) 14939f754758SChristoph Hellwig __dquot_drop(inode); 1494884d179dSJan Kara } 14959f754758SChristoph Hellwig EXPORT_SYMBOL(dquot_drop); 1496884d179dSJan Kara 1497884d179dSJan Kara /* 1498fd8fbfc1SDmitry Monakhov * inode_reserved_space is managed internally by quota, and protected by 1499fd8fbfc1SDmitry Monakhov * i_lock similar to i_blocks+i_bytes. 1500fd8fbfc1SDmitry Monakhov */ 1501fd8fbfc1SDmitry Monakhov static qsize_t *inode_reserved_space(struct inode * inode) 1502fd8fbfc1SDmitry Monakhov { 1503fd8fbfc1SDmitry Monakhov /* Filesystem must explicitly define it's own method in order to use 1504fd8fbfc1SDmitry Monakhov * quota reservation interface */ 1505fd8fbfc1SDmitry Monakhov BUG_ON(!inode->i_sb->dq_op->get_reserved_space); 1506fd8fbfc1SDmitry Monakhov return inode->i_sb->dq_op->get_reserved_space(inode); 1507fd8fbfc1SDmitry Monakhov } 1508fd8fbfc1SDmitry Monakhov 1509c469070aSDmitry Monakhov void inode_add_rsv_space(struct inode *inode, qsize_t number) 1510fd8fbfc1SDmitry Monakhov { 1511fd8fbfc1SDmitry Monakhov spin_lock(&inode->i_lock); 1512fd8fbfc1SDmitry Monakhov *inode_reserved_space(inode) += number; 1513fd8fbfc1SDmitry Monakhov spin_unlock(&inode->i_lock); 1514fd8fbfc1SDmitry Monakhov } 1515c469070aSDmitry Monakhov EXPORT_SYMBOL(inode_add_rsv_space); 1516fd8fbfc1SDmitry Monakhov 1517c469070aSDmitry Monakhov void inode_claim_rsv_space(struct inode *inode, qsize_t number) 1518fd8fbfc1SDmitry Monakhov { 1519fd8fbfc1SDmitry Monakhov spin_lock(&inode->i_lock); 1520fd8fbfc1SDmitry Monakhov *inode_reserved_space(inode) -= number; 1521fd8fbfc1SDmitry Monakhov __inode_add_bytes(inode, number); 1522fd8fbfc1SDmitry Monakhov spin_unlock(&inode->i_lock); 1523fd8fbfc1SDmitry Monakhov } 1524c469070aSDmitry Monakhov EXPORT_SYMBOL(inode_claim_rsv_space); 1525fd8fbfc1SDmitry Monakhov 1526c469070aSDmitry Monakhov void inode_sub_rsv_space(struct inode *inode, qsize_t number) 1527fd8fbfc1SDmitry Monakhov { 1528fd8fbfc1SDmitry Monakhov spin_lock(&inode->i_lock); 1529fd8fbfc1SDmitry Monakhov *inode_reserved_space(inode) -= number; 1530fd8fbfc1SDmitry Monakhov spin_unlock(&inode->i_lock); 1531fd8fbfc1SDmitry Monakhov } 1532c469070aSDmitry Monakhov EXPORT_SYMBOL(inode_sub_rsv_space); 1533fd8fbfc1SDmitry Monakhov 1534fd8fbfc1SDmitry Monakhov static qsize_t inode_get_rsv_space(struct inode *inode) 1535fd8fbfc1SDmitry Monakhov { 1536fd8fbfc1SDmitry Monakhov qsize_t ret; 153705b5d898SJan Kara 153805b5d898SJan Kara if (!inode->i_sb->dq_op->get_reserved_space) 153905b5d898SJan Kara return 0; 1540fd8fbfc1SDmitry Monakhov spin_lock(&inode->i_lock); 1541fd8fbfc1SDmitry Monakhov ret = *inode_reserved_space(inode); 1542fd8fbfc1SDmitry Monakhov spin_unlock(&inode->i_lock); 1543fd8fbfc1SDmitry Monakhov return ret; 1544fd8fbfc1SDmitry Monakhov } 1545fd8fbfc1SDmitry Monakhov 1546fd8fbfc1SDmitry Monakhov static void inode_incr_space(struct inode *inode, qsize_t number, 1547fd8fbfc1SDmitry Monakhov int reserve) 1548fd8fbfc1SDmitry Monakhov { 1549fd8fbfc1SDmitry Monakhov if (reserve) 1550fd8fbfc1SDmitry Monakhov inode_add_rsv_space(inode, number); 1551fd8fbfc1SDmitry Monakhov else 1552fd8fbfc1SDmitry Monakhov inode_add_bytes(inode, number); 1553fd8fbfc1SDmitry Monakhov } 1554fd8fbfc1SDmitry Monakhov 1555fd8fbfc1SDmitry Monakhov static void inode_decr_space(struct inode *inode, qsize_t number, int reserve) 1556fd8fbfc1SDmitry Monakhov { 1557fd8fbfc1SDmitry Monakhov if (reserve) 1558fd8fbfc1SDmitry Monakhov inode_sub_rsv_space(inode, number); 1559fd8fbfc1SDmitry Monakhov else 1560fd8fbfc1SDmitry Monakhov inode_sub_bytes(inode, number); 1561fd8fbfc1SDmitry Monakhov } 1562fd8fbfc1SDmitry Monakhov 1563fd8fbfc1SDmitry Monakhov /* 15645dd4056dSChristoph Hellwig * This functions updates i_blocks+i_bytes fields and quota information 15655dd4056dSChristoph Hellwig * (together with appropriate checks). 15665dd4056dSChristoph Hellwig * 15675dd4056dSChristoph Hellwig * NOTE: We absolutely rely on the fact that caller dirties the inode 15685dd4056dSChristoph Hellwig * (usually helpers in quotaops.h care about this) and holds a handle for 15695dd4056dSChristoph Hellwig * the current transaction so that dquot write and inode write go into the 15705dd4056dSChristoph Hellwig * same transaction. 1571884d179dSJan Kara */ 1572884d179dSJan Kara 1573884d179dSJan Kara /* 1574884d179dSJan Kara * This operation can block, but only after everything is updated 1575884d179dSJan Kara */ 157656246f9aSEric Sandeen int __dquot_alloc_space(struct inode *inode, qsize_t number, int flags) 1577884d179dSJan Kara { 15785dd4056dSChristoph Hellwig int cnt, ret = 0; 1579bf097aafSJan Kara struct dquot_warn warn[MAXQUOTAS]; 1580bf097aafSJan Kara struct dquot **dquots = inode->i_dquot; 158156246f9aSEric Sandeen int reserve = flags & DQUOT_SPACE_RESERVE; 1582884d179dSJan Kara 1583fd8fbfc1SDmitry Monakhov /* 1584fd8fbfc1SDmitry Monakhov * First test before acquiring mutex - solves deadlocks when we 1585fd8fbfc1SDmitry Monakhov * re-enter the quota code and are already holding the mutex 1586fd8fbfc1SDmitry Monakhov */ 1587189eef59SChristoph Hellwig if (!dquot_active(inode)) { 1588fd8fbfc1SDmitry Monakhov inode_incr_space(inode, number, reserve); 1589fd8fbfc1SDmitry Monakhov goto out; 1590fd8fbfc1SDmitry Monakhov } 1591fd8fbfc1SDmitry Monakhov 1592884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 1593bf097aafSJan Kara warn[cnt].w_type = QUOTA_NL_NOWARN; 1594884d179dSJan Kara 1595*6ea2eea1SJeff Liu down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1596884d179dSJan Kara spin_lock(&dq_data_lock); 1597884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1598bf097aafSJan Kara if (!dquots[cnt]) 1599884d179dSJan Kara continue; 1600bf097aafSJan Kara ret = check_bdq(dquots[cnt], number, 1601bf097aafSJan Kara !(flags & DQUOT_SPACE_WARN), &warn[cnt]); 1602bf097aafSJan Kara if (ret && !(flags & DQUOT_SPACE_NOFAIL)) { 1603fd8fbfc1SDmitry Monakhov spin_unlock(&dq_data_lock); 1604fd8fbfc1SDmitry Monakhov goto out_flush_warn; 1605884d179dSJan Kara } 1606884d179dSJan Kara } 1607884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1608bf097aafSJan Kara if (!dquots[cnt]) 1609884d179dSJan Kara continue; 1610884d179dSJan Kara if (reserve) 1611bf097aafSJan Kara dquot_resv_space(dquots[cnt], number); 1612884d179dSJan Kara else 1613bf097aafSJan Kara dquot_incr_space(dquots[cnt], number); 1614884d179dSJan Kara } 1615fd8fbfc1SDmitry Monakhov inode_incr_space(inode, number, reserve); 1616884d179dSJan Kara spin_unlock(&dq_data_lock); 1617fd8fbfc1SDmitry Monakhov 1618fd8fbfc1SDmitry Monakhov if (reserve) 1619fd8fbfc1SDmitry Monakhov goto out_flush_warn; 1620bf097aafSJan Kara mark_all_dquot_dirty(dquots); 1621fd8fbfc1SDmitry Monakhov out_flush_warn: 1622fd8fbfc1SDmitry Monakhov up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1623bf097aafSJan Kara flush_warnings(warn); 1624fd8fbfc1SDmitry Monakhov out: 1625884d179dSJan Kara return ret; 1626884d179dSJan Kara } 16275dd4056dSChristoph Hellwig EXPORT_SYMBOL(__dquot_alloc_space); 1628884d179dSJan Kara 1629884d179dSJan Kara /* 1630884d179dSJan Kara * This operation can block, but only after everything is updated 1631884d179dSJan Kara */ 163263936ddaSChristoph Hellwig int dquot_alloc_inode(const struct inode *inode) 1633884d179dSJan Kara { 1634efd8f0e6SChristoph Hellwig int cnt, ret = 0; 1635bf097aafSJan Kara struct dquot_warn warn[MAXQUOTAS]; 1636bf097aafSJan Kara struct dquot * const *dquots = inode->i_dquot; 1637884d179dSJan Kara 1638884d179dSJan Kara /* First test before acquiring mutex - solves deadlocks when we 1639884d179dSJan Kara * re-enter the quota code and are already holding the mutex */ 1640189eef59SChristoph Hellwig if (!dquot_active(inode)) 164163936ddaSChristoph Hellwig return 0; 1642884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 1643bf097aafSJan Kara warn[cnt].w_type = QUOTA_NL_NOWARN; 1644884d179dSJan Kara down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1645884d179dSJan Kara spin_lock(&dq_data_lock); 1646884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1647bf097aafSJan Kara if (!dquots[cnt]) 1648884d179dSJan Kara continue; 1649bf097aafSJan Kara ret = check_idq(dquots[cnt], 1, &warn[cnt]); 1650efd8f0e6SChristoph Hellwig if (ret) 1651884d179dSJan Kara goto warn_put_all; 1652884d179dSJan Kara } 1653884d179dSJan Kara 1654884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1655bf097aafSJan Kara if (!dquots[cnt]) 1656884d179dSJan Kara continue; 1657bf097aafSJan Kara dquot_incr_inodes(dquots[cnt], 1); 1658884d179dSJan Kara } 1659efd8f0e6SChristoph Hellwig 1660884d179dSJan Kara warn_put_all: 1661884d179dSJan Kara spin_unlock(&dq_data_lock); 166263936ddaSChristoph Hellwig if (ret == 0) 1663bf097aafSJan Kara mark_all_dquot_dirty(dquots); 1664884d179dSJan Kara up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1665bf097aafSJan Kara flush_warnings(warn); 1666884d179dSJan Kara return ret; 1667884d179dSJan Kara } 1668884d179dSJan Kara EXPORT_SYMBOL(dquot_alloc_inode); 1669884d179dSJan Kara 16705dd4056dSChristoph Hellwig /* 16715dd4056dSChristoph Hellwig * Convert in-memory reserved quotas to real consumed quotas 16725dd4056dSChristoph Hellwig */ 16735dd4056dSChristoph Hellwig int dquot_claim_space_nodirty(struct inode *inode, qsize_t number) 1674884d179dSJan Kara { 1675884d179dSJan Kara int cnt; 1676884d179dSJan Kara 1677189eef59SChristoph Hellwig if (!dquot_active(inode)) { 1678fd8fbfc1SDmitry Monakhov inode_claim_rsv_space(inode, number); 16795dd4056dSChristoph Hellwig return 0; 1680884d179dSJan Kara } 1681884d179dSJan Kara 1682884d179dSJan Kara down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1683884d179dSJan Kara spin_lock(&dq_data_lock); 1684884d179dSJan Kara /* Claim reserved quotas to allocated quotas */ 1685884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1686dd6f3c6dSJan Kara if (inode->i_dquot[cnt]) 1687884d179dSJan Kara dquot_claim_reserved_space(inode->i_dquot[cnt], 1688884d179dSJan Kara number); 1689884d179dSJan Kara } 1690884d179dSJan Kara /* Update inode bytes */ 1691fd8fbfc1SDmitry Monakhov inode_claim_rsv_space(inode, number); 1692884d179dSJan Kara spin_unlock(&dq_data_lock); 1693dc52dd3aSDmitry Monakhov mark_all_dquot_dirty(inode->i_dquot); 1694884d179dSJan Kara up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 16955dd4056dSChristoph Hellwig return 0; 1696884d179dSJan Kara } 16975dd4056dSChristoph Hellwig EXPORT_SYMBOL(dquot_claim_space_nodirty); 1698884d179dSJan Kara 1699884d179dSJan Kara /* 1700884d179dSJan Kara * This operation can block, but only after everything is updated 1701884d179dSJan Kara */ 170256246f9aSEric Sandeen void __dquot_free_space(struct inode *inode, qsize_t number, int flags) 1703884d179dSJan Kara { 1704884d179dSJan Kara unsigned int cnt; 1705bf097aafSJan Kara struct dquot_warn warn[MAXQUOTAS]; 1706bf097aafSJan Kara struct dquot **dquots = inode->i_dquot; 170756246f9aSEric Sandeen int reserve = flags & DQUOT_SPACE_RESERVE; 1708884d179dSJan Kara 1709884d179dSJan Kara /* First test before acquiring mutex - solves deadlocks when we 1710884d179dSJan Kara * re-enter the quota code and are already holding the mutex */ 1711189eef59SChristoph Hellwig if (!dquot_active(inode)) { 1712fd8fbfc1SDmitry Monakhov inode_decr_space(inode, number, reserve); 17135dd4056dSChristoph Hellwig return; 1714884d179dSJan Kara } 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++) { 1719bf097aafSJan Kara int wtype; 1720bf097aafSJan Kara 1721bf097aafSJan Kara warn[cnt].w_type = QUOTA_NL_NOWARN; 1722bf097aafSJan Kara if (!dquots[cnt]) 1723884d179dSJan Kara continue; 1724bf097aafSJan Kara wtype = info_bdq_free(dquots[cnt], number); 1725bf097aafSJan Kara if (wtype != QUOTA_NL_NOWARN) 1726bf097aafSJan Kara prepare_warning(&warn[cnt], dquots[cnt], wtype); 1727fd8fbfc1SDmitry Monakhov if (reserve) 1728bf097aafSJan Kara dquot_free_reserved_space(dquots[cnt], number); 1729fd8fbfc1SDmitry Monakhov else 1730bf097aafSJan Kara dquot_decr_space(dquots[cnt], number); 1731884d179dSJan Kara } 1732fd8fbfc1SDmitry Monakhov inode_decr_space(inode, number, reserve); 1733884d179dSJan Kara spin_unlock(&dq_data_lock); 1734fd8fbfc1SDmitry Monakhov 1735fd8fbfc1SDmitry Monakhov if (reserve) 1736fd8fbfc1SDmitry Monakhov goto out_unlock; 1737bf097aafSJan Kara mark_all_dquot_dirty(dquots); 1738fd8fbfc1SDmitry Monakhov out_unlock: 1739884d179dSJan Kara up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1740bf097aafSJan Kara flush_warnings(warn); 1741884d179dSJan Kara } 17425dd4056dSChristoph Hellwig EXPORT_SYMBOL(__dquot_free_space); 1743fd8fbfc1SDmitry Monakhov 1744fd8fbfc1SDmitry Monakhov /* 1745884d179dSJan Kara * This operation can block, but only after everything is updated 1746884d179dSJan Kara */ 174763936ddaSChristoph Hellwig void dquot_free_inode(const struct inode *inode) 1748884d179dSJan Kara { 1749884d179dSJan Kara unsigned int cnt; 1750bf097aafSJan Kara struct dquot_warn warn[MAXQUOTAS]; 1751bf097aafSJan Kara struct dquot * const *dquots = inode->i_dquot; 1752884d179dSJan Kara 1753884d179dSJan Kara /* First test before acquiring mutex - solves deadlocks when we 1754884d179dSJan Kara * re-enter the quota code and are already holding the mutex */ 1755189eef59SChristoph Hellwig if (!dquot_active(inode)) 175663936ddaSChristoph Hellwig return; 1757884d179dSJan Kara 1758884d179dSJan Kara down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1759884d179dSJan Kara spin_lock(&dq_data_lock); 1760884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1761bf097aafSJan Kara int wtype; 1762bf097aafSJan Kara 1763bf097aafSJan Kara warn[cnt].w_type = QUOTA_NL_NOWARN; 1764bf097aafSJan Kara if (!dquots[cnt]) 1765884d179dSJan Kara continue; 1766bf097aafSJan Kara wtype = info_idq_free(dquots[cnt], 1); 1767bf097aafSJan Kara if (wtype != QUOTA_NL_NOWARN) 1768bf097aafSJan Kara prepare_warning(&warn[cnt], dquots[cnt], wtype); 1769bf097aafSJan Kara dquot_decr_inodes(dquots[cnt], 1); 1770884d179dSJan Kara } 1771884d179dSJan Kara spin_unlock(&dq_data_lock); 1772bf097aafSJan Kara mark_all_dquot_dirty(dquots); 1773884d179dSJan Kara up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1774bf097aafSJan Kara flush_warnings(warn); 1775884d179dSJan Kara } 1776884d179dSJan Kara EXPORT_SYMBOL(dquot_free_inode); 1777884d179dSJan Kara 1778884d179dSJan Kara /* 1779884d179dSJan Kara * Transfer the number of inode and blocks from one diskquota to an other. 1780bc8e5f07SJan Kara * On success, dquot references in transfer_to are consumed and references 1781bc8e5f07SJan Kara * to original dquots that need to be released are placed there. On failure, 1782bc8e5f07SJan Kara * references are kept untouched. 1783884d179dSJan Kara * 1784884d179dSJan Kara * This operation can block, but only after everything is updated 1785884d179dSJan Kara * A transaction must be started when entering this function. 1786bc8e5f07SJan Kara * 1787884d179dSJan Kara */ 1788bc8e5f07SJan Kara int __dquot_transfer(struct inode *inode, struct dquot **transfer_to) 1789884d179dSJan Kara { 1790884d179dSJan Kara qsize_t space, cur_space; 1791884d179dSJan Kara qsize_t rsv_space = 0; 1792bc8e5f07SJan Kara struct dquot *transfer_from[MAXQUOTAS] = {}; 1793efd8f0e6SChristoph Hellwig int cnt, ret = 0; 17949e32784bSDmitry char is_valid[MAXQUOTAS] = {}; 1795bf097aafSJan Kara struct dquot_warn warn_to[MAXQUOTAS]; 1796bf097aafSJan Kara struct dquot_warn warn_from_inodes[MAXQUOTAS]; 1797bf097aafSJan Kara struct dquot_warn warn_from_space[MAXQUOTAS]; 1798884d179dSJan Kara 1799884d179dSJan Kara /* First test before acquiring mutex - solves deadlocks when we 1800884d179dSJan Kara * re-enter the quota code and are already holding the mutex */ 1801884d179dSJan Kara if (IS_NOQUOTA(inode)) 1802efd8f0e6SChristoph Hellwig return 0; 1803884d179dSJan Kara /* Initialize the arrays */ 1804bf097aafSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1805bf097aafSJan Kara warn_to[cnt].w_type = QUOTA_NL_NOWARN; 1806bf097aafSJan Kara warn_from_inodes[cnt].w_type = QUOTA_NL_NOWARN; 1807bf097aafSJan Kara warn_from_space[cnt].w_type = QUOTA_NL_NOWARN; 1808bf097aafSJan Kara } 1809884d179dSJan Kara down_write(&sb_dqopt(inode->i_sb)->dqptr_sem); 1810884d179dSJan Kara if (IS_NOQUOTA(inode)) { /* File without quota accounting? */ 1811884d179dSJan Kara up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); 1812bc8e5f07SJan Kara return 0; 1813884d179dSJan Kara } 1814884d179dSJan Kara spin_lock(&dq_data_lock); 1815884d179dSJan Kara cur_space = inode_get_bytes(inode); 1816fd8fbfc1SDmitry Monakhov rsv_space = inode_get_rsv_space(inode); 1817884d179dSJan Kara space = cur_space + rsv_space; 1818884d179dSJan Kara /* Build the transfer_from list and check the limits */ 1819884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 18209e32784bSDmitry /* 18219e32784bSDmitry * Skip changes for same uid or gid or for turned off quota-type. 18229e32784bSDmitry */ 1823dd6f3c6dSJan Kara if (!transfer_to[cnt]) 1824884d179dSJan Kara continue; 18259e32784bSDmitry /* Avoid races with quotaoff() */ 18269e32784bSDmitry if (!sb_has_quota_active(inode->i_sb, cnt)) 18279e32784bSDmitry continue; 18289e32784bSDmitry is_valid[cnt] = 1; 1829884d179dSJan Kara transfer_from[cnt] = inode->i_dquot[cnt]; 1830bf097aafSJan Kara ret = check_idq(transfer_to[cnt], 1, &warn_to[cnt]); 1831efd8f0e6SChristoph Hellwig if (ret) 1832efd8f0e6SChristoph Hellwig goto over_quota; 1833bf097aafSJan Kara ret = check_bdq(transfer_to[cnt], space, 0, &warn_to[cnt]); 1834efd8f0e6SChristoph Hellwig if (ret) 1835884d179dSJan Kara goto over_quota; 1836884d179dSJan Kara } 1837884d179dSJan Kara 1838884d179dSJan Kara /* 1839884d179dSJan Kara * Finally perform the needed transfer from transfer_from to transfer_to 1840884d179dSJan Kara */ 1841884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 18429e32784bSDmitry if (!is_valid[cnt]) 1843884d179dSJan Kara continue; 1844884d179dSJan Kara /* Due to IO error we might not have transfer_from[] structure */ 1845884d179dSJan Kara if (transfer_from[cnt]) { 1846bf097aafSJan Kara int wtype; 1847bf097aafSJan Kara wtype = info_idq_free(transfer_from[cnt], 1); 1848bf097aafSJan Kara if (wtype != QUOTA_NL_NOWARN) 1849bf097aafSJan Kara prepare_warning(&warn_from_inodes[cnt], 1850bf097aafSJan Kara transfer_from[cnt], wtype); 1851bf097aafSJan Kara wtype = info_bdq_free(transfer_from[cnt], space); 1852bf097aafSJan Kara if (wtype != QUOTA_NL_NOWARN) 1853bf097aafSJan Kara prepare_warning(&warn_from_space[cnt], 1854bf097aafSJan Kara transfer_from[cnt], wtype); 1855884d179dSJan Kara dquot_decr_inodes(transfer_from[cnt], 1); 1856884d179dSJan Kara dquot_decr_space(transfer_from[cnt], cur_space); 1857884d179dSJan Kara dquot_free_reserved_space(transfer_from[cnt], 1858884d179dSJan Kara rsv_space); 1859884d179dSJan Kara } 1860884d179dSJan Kara 1861884d179dSJan Kara dquot_incr_inodes(transfer_to[cnt], 1); 1862884d179dSJan Kara dquot_incr_space(transfer_to[cnt], cur_space); 1863884d179dSJan Kara dquot_resv_space(transfer_to[cnt], rsv_space); 1864884d179dSJan Kara 1865884d179dSJan Kara inode->i_dquot[cnt] = transfer_to[cnt]; 1866884d179dSJan Kara } 1867884d179dSJan Kara spin_unlock(&dq_data_lock); 1868884d179dSJan Kara up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); 1869884d179dSJan Kara 1870dc52dd3aSDmitry Monakhov mark_all_dquot_dirty(transfer_from); 1871dc52dd3aSDmitry Monakhov mark_all_dquot_dirty(transfer_to); 1872bf097aafSJan Kara flush_warnings(warn_to); 1873bf097aafSJan Kara flush_warnings(warn_from_inodes); 1874bf097aafSJan Kara flush_warnings(warn_from_space); 1875bc8e5f07SJan Kara /* Pass back references to put */ 1876dc52dd3aSDmitry Monakhov for (cnt = 0; cnt < MAXQUOTAS; cnt++) 18779e32784bSDmitry if (is_valid[cnt]) 1878bc8e5f07SJan Kara transfer_to[cnt] = transfer_from[cnt]; 187986f3cbecSJan Kara return 0; 1880884d179dSJan Kara over_quota: 1881884d179dSJan Kara spin_unlock(&dq_data_lock); 1882884d179dSJan Kara up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); 1883bf097aafSJan Kara flush_warnings(warn_to); 188486f3cbecSJan Kara return ret; 1885884d179dSJan Kara } 1886bc8e5f07SJan Kara EXPORT_SYMBOL(__dquot_transfer); 1887884d179dSJan Kara 18888ddd69d6SDmitry Monakhov /* Wrapper for transferring ownership of an inode for uid/gid only 18898ddd69d6SDmitry Monakhov * Called from FSXXX_setattr() 18908ddd69d6SDmitry Monakhov */ 1891b43fa828SChristoph Hellwig int dquot_transfer(struct inode *inode, struct iattr *iattr) 1892884d179dSJan Kara { 1893bc8e5f07SJan Kara struct dquot *transfer_to[MAXQUOTAS] = {}; 1894bc8e5f07SJan Kara struct super_block *sb = inode->i_sb; 1895bc8e5f07SJan Kara int ret; 18968ddd69d6SDmitry Monakhov 1897189eef59SChristoph Hellwig if (!dquot_active(inode)) 1898884d179dSJan Kara return 0; 1899bc8e5f07SJan Kara 1900bc8e5f07SJan Kara if (iattr->ia_valid & ATTR_UID && iattr->ia_uid != inode->i_uid) 1901bc8e5f07SJan Kara transfer_to[USRQUOTA] = dqget(sb, iattr->ia_uid, USRQUOTA); 1902bc8e5f07SJan Kara if (iattr->ia_valid & ATTR_GID && iattr->ia_gid != inode->i_gid) 19034dea4969SJan Kara transfer_to[GRPQUOTA] = dqget(sb, iattr->ia_gid, GRPQUOTA); 1904bc8e5f07SJan Kara 1905bc8e5f07SJan Kara ret = __dquot_transfer(inode, transfer_to); 1906bc8e5f07SJan Kara dqput_all(transfer_to); 1907bc8e5f07SJan Kara return ret; 1908884d179dSJan Kara } 1909b43fa828SChristoph Hellwig EXPORT_SYMBOL(dquot_transfer); 1910884d179dSJan Kara 1911884d179dSJan Kara /* 1912884d179dSJan Kara * Write info of quota file to disk 1913884d179dSJan Kara */ 1914884d179dSJan Kara int dquot_commit_info(struct super_block *sb, int type) 1915884d179dSJan Kara { 1916884d179dSJan Kara int ret; 1917884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 1918884d179dSJan Kara 1919884d179dSJan Kara mutex_lock(&dqopt->dqio_mutex); 1920884d179dSJan Kara ret = dqopt->ops[type]->write_file_info(sb, type); 1921884d179dSJan Kara mutex_unlock(&dqopt->dqio_mutex); 1922884d179dSJan Kara return ret; 1923884d179dSJan Kara } 1924884d179dSJan Kara EXPORT_SYMBOL(dquot_commit_info); 1925884d179dSJan Kara 1926884d179dSJan Kara /* 1927884d179dSJan Kara * Definitions of diskquota operations. 1928884d179dSJan Kara */ 192961e225dcSAlexey Dobriyan const struct dquot_operations dquot_operations = { 1930884d179dSJan Kara .write_dquot = dquot_commit, 1931884d179dSJan Kara .acquire_dquot = dquot_acquire, 1932884d179dSJan Kara .release_dquot = dquot_release, 1933884d179dSJan Kara .mark_dirty = dquot_mark_dquot_dirty, 1934884d179dSJan Kara .write_info = dquot_commit_info, 1935884d179dSJan Kara .alloc_dquot = dquot_alloc, 1936884d179dSJan Kara .destroy_dquot = dquot_destroy, 1937884d179dSJan Kara }; 1938123e9cafSChristoph Hellwig EXPORT_SYMBOL(dquot_operations); 1939884d179dSJan Kara 1940884d179dSJan Kara /* 1941907f4554SChristoph Hellwig * Generic helper for ->open on filesystems supporting disk quotas. 1942907f4554SChristoph Hellwig */ 1943907f4554SChristoph Hellwig int dquot_file_open(struct inode *inode, struct file *file) 1944907f4554SChristoph Hellwig { 1945907f4554SChristoph Hellwig int error; 1946907f4554SChristoph Hellwig 1947907f4554SChristoph Hellwig error = generic_file_open(inode, file); 1948907f4554SChristoph Hellwig if (!error && (file->f_mode & FMODE_WRITE)) 1949871a2931SChristoph Hellwig dquot_initialize(inode); 1950907f4554SChristoph Hellwig return error; 1951907f4554SChristoph Hellwig } 1952907f4554SChristoph Hellwig EXPORT_SYMBOL(dquot_file_open); 1953907f4554SChristoph Hellwig 1954907f4554SChristoph Hellwig /* 1955884d179dSJan Kara * Turn quota off on a device. type == -1 ==> quotaoff for all types (umount) 1956884d179dSJan Kara */ 19570f0dd62fSChristoph Hellwig int dquot_disable(struct super_block *sb, int type, unsigned int flags) 1958884d179dSJan Kara { 1959884d179dSJan Kara int cnt, ret = 0; 1960884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 1961884d179dSJan Kara struct inode *toputinode[MAXQUOTAS]; 1962884d179dSJan Kara 1963884d179dSJan Kara /* Cannot turn off usage accounting without turning off limits, or 1964884d179dSJan Kara * suspend quotas and simultaneously turn quotas off. */ 1965884d179dSJan Kara if ((flags & DQUOT_USAGE_ENABLED && !(flags & DQUOT_LIMITS_ENABLED)) 1966884d179dSJan Kara || (flags & DQUOT_SUSPENDED && flags & (DQUOT_LIMITS_ENABLED | 1967884d179dSJan Kara DQUOT_USAGE_ENABLED))) 1968884d179dSJan Kara return -EINVAL; 1969884d179dSJan Kara 1970884d179dSJan Kara /* We need to serialize quota_off() for device */ 1971884d179dSJan Kara mutex_lock(&dqopt->dqonoff_mutex); 1972884d179dSJan Kara 1973884d179dSJan Kara /* 1974884d179dSJan Kara * Skip everything if there's nothing to do. We have to do this because 1975884d179dSJan Kara * sometimes we are called when fill_super() failed and calling 1976884d179dSJan Kara * sync_fs() in such cases does no good. 1977884d179dSJan Kara */ 1978884d179dSJan Kara if (!sb_any_quota_loaded(sb)) { 1979884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 1980884d179dSJan Kara return 0; 1981884d179dSJan Kara } 1982884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1983884d179dSJan Kara toputinode[cnt] = NULL; 1984884d179dSJan Kara if (type != -1 && cnt != type) 1985884d179dSJan Kara continue; 1986884d179dSJan Kara if (!sb_has_quota_loaded(sb, cnt)) 1987884d179dSJan Kara continue; 1988884d179dSJan Kara 1989884d179dSJan Kara if (flags & DQUOT_SUSPENDED) { 1990884d179dSJan Kara spin_lock(&dq_state_lock); 1991884d179dSJan Kara dqopt->flags |= 1992884d179dSJan Kara dquot_state_flag(DQUOT_SUSPENDED, cnt); 1993884d179dSJan Kara spin_unlock(&dq_state_lock); 1994884d179dSJan Kara } else { 1995884d179dSJan Kara spin_lock(&dq_state_lock); 1996884d179dSJan Kara dqopt->flags &= ~dquot_state_flag(flags, cnt); 1997884d179dSJan Kara /* Turning off suspended quotas? */ 1998884d179dSJan Kara if (!sb_has_quota_loaded(sb, cnt) && 1999884d179dSJan Kara sb_has_quota_suspended(sb, cnt)) { 2000884d179dSJan Kara dqopt->flags &= ~dquot_state_flag( 2001884d179dSJan Kara DQUOT_SUSPENDED, cnt); 2002884d179dSJan Kara spin_unlock(&dq_state_lock); 2003884d179dSJan Kara iput(dqopt->files[cnt]); 2004884d179dSJan Kara dqopt->files[cnt] = NULL; 2005884d179dSJan Kara continue; 2006884d179dSJan Kara } 2007884d179dSJan Kara spin_unlock(&dq_state_lock); 2008884d179dSJan Kara } 2009884d179dSJan Kara 2010884d179dSJan Kara /* We still have to keep quota loaded? */ 2011884d179dSJan Kara if (sb_has_quota_loaded(sb, cnt) && !(flags & DQUOT_SUSPENDED)) 2012884d179dSJan Kara continue; 2013884d179dSJan Kara 2014884d179dSJan Kara /* Note: these are blocking operations */ 2015884d179dSJan Kara drop_dquot_ref(sb, cnt); 2016884d179dSJan Kara invalidate_dquots(sb, cnt); 2017884d179dSJan Kara /* 2018268157baSJan Kara * Now all dquots should be invalidated, all writes done so we 2019268157baSJan Kara * should be only users of the info. No locks needed. 2020884d179dSJan Kara */ 2021884d179dSJan Kara if (info_dirty(&dqopt->info[cnt])) 2022884d179dSJan Kara sb->dq_op->write_info(sb, cnt); 2023884d179dSJan Kara if (dqopt->ops[cnt]->free_file_info) 2024884d179dSJan Kara dqopt->ops[cnt]->free_file_info(sb, cnt); 2025884d179dSJan Kara put_quota_format(dqopt->info[cnt].dqi_format); 2026884d179dSJan Kara 2027884d179dSJan Kara toputinode[cnt] = dqopt->files[cnt]; 2028884d179dSJan Kara if (!sb_has_quota_loaded(sb, cnt)) 2029884d179dSJan Kara dqopt->files[cnt] = NULL; 2030884d179dSJan Kara dqopt->info[cnt].dqi_flags = 0; 2031884d179dSJan Kara dqopt->info[cnt].dqi_igrace = 0; 2032884d179dSJan Kara dqopt->info[cnt].dqi_bgrace = 0; 2033884d179dSJan Kara dqopt->ops[cnt] = NULL; 2034884d179dSJan Kara } 2035884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 2036884d179dSJan Kara 2037884d179dSJan Kara /* Skip syncing and setting flags if quota files are hidden */ 2038884d179dSJan Kara if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) 2039884d179dSJan Kara goto put_inodes; 2040884d179dSJan Kara 2041884d179dSJan Kara /* Sync the superblock so that buffers with quota data are written to 2042884d179dSJan Kara * disk (and so userspace sees correct data afterwards). */ 2043884d179dSJan Kara if (sb->s_op->sync_fs) 2044884d179dSJan Kara sb->s_op->sync_fs(sb, 1); 2045884d179dSJan Kara sync_blockdev(sb->s_bdev); 2046884d179dSJan Kara /* Now the quota files are just ordinary files and we can set the 2047884d179dSJan Kara * inode flags back. Moreover we discard the pagecache so that 2048884d179dSJan Kara * userspace sees the writes we did bypassing the pagecache. We 2049884d179dSJan Kara * must also discard the blockdev buffers so that we see the 2050884d179dSJan Kara * changes done by userspace on the next quotaon() */ 2051884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 2052884d179dSJan Kara if (toputinode[cnt]) { 2053884d179dSJan Kara mutex_lock(&dqopt->dqonoff_mutex); 2054884d179dSJan Kara /* If quota was reenabled in the meantime, we have 2055884d179dSJan Kara * nothing to do */ 2056884d179dSJan Kara if (!sb_has_quota_loaded(sb, cnt)) { 2057a80b12c3SJan Kara mutex_lock(&toputinode[cnt]->i_mutex); 2058884d179dSJan Kara toputinode[cnt]->i_flags &= ~(S_IMMUTABLE | 2059884d179dSJan Kara S_NOATIME | S_NOQUOTA); 2060268157baSJan Kara truncate_inode_pages(&toputinode[cnt]->i_data, 2061268157baSJan Kara 0); 2062884d179dSJan Kara mutex_unlock(&toputinode[cnt]->i_mutex); 206343d2932dSJan Kara mark_inode_dirty_sync(toputinode[cnt]); 2064884d179dSJan Kara } 2065884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 2066884d179dSJan Kara } 2067884d179dSJan Kara if (sb->s_bdev) 2068884d179dSJan Kara invalidate_bdev(sb->s_bdev); 2069884d179dSJan Kara put_inodes: 2070884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 2071884d179dSJan Kara if (toputinode[cnt]) { 2072884d179dSJan Kara /* On remount RO, we keep the inode pointer so that we 2073884d179dSJan Kara * can reenable quota on the subsequent remount RW. We 2074884d179dSJan Kara * have to check 'flags' variable and not use sb_has_ 2075884d179dSJan Kara * function because another quotaon / quotaoff could 2076884d179dSJan Kara * change global state before we got here. We refuse 2077884d179dSJan Kara * to suspend quotas when there is pending delete on 2078884d179dSJan Kara * the quota file... */ 2079884d179dSJan Kara if (!(flags & DQUOT_SUSPENDED)) 2080884d179dSJan Kara iput(toputinode[cnt]); 2081884d179dSJan Kara else if (!toputinode[cnt]->i_nlink) 2082884d179dSJan Kara ret = -EBUSY; 2083884d179dSJan Kara } 2084884d179dSJan Kara return ret; 2085884d179dSJan Kara } 20860f0dd62fSChristoph Hellwig EXPORT_SYMBOL(dquot_disable); 2087884d179dSJan Kara 2088287a8095SChristoph Hellwig int dquot_quota_off(struct super_block *sb, int type) 2089884d179dSJan Kara { 20900f0dd62fSChristoph Hellwig return dquot_disable(sb, type, 20910f0dd62fSChristoph Hellwig DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); 2092884d179dSJan Kara } 2093287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_quota_off); 20940f0dd62fSChristoph Hellwig 2095884d179dSJan Kara /* 2096884d179dSJan Kara * Turn quotas on on a device 2097884d179dSJan Kara */ 2098884d179dSJan Kara 2099884d179dSJan Kara /* 2100884d179dSJan Kara * Helper function to turn quotas on when we already have the inode of 2101884d179dSJan Kara * quota file and no quota information is loaded. 2102884d179dSJan Kara */ 2103884d179dSJan Kara static int vfs_load_quota_inode(struct inode *inode, int type, int format_id, 2104884d179dSJan Kara unsigned int flags) 2105884d179dSJan Kara { 2106884d179dSJan Kara struct quota_format_type *fmt = find_quota_format(format_id); 2107884d179dSJan Kara struct super_block *sb = inode->i_sb; 2108884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 2109884d179dSJan Kara int error; 2110884d179dSJan Kara int oldflags = -1; 2111884d179dSJan Kara 2112884d179dSJan Kara if (!fmt) 2113884d179dSJan Kara return -ESRCH; 2114884d179dSJan Kara if (!S_ISREG(inode->i_mode)) { 2115884d179dSJan Kara error = -EACCES; 2116884d179dSJan Kara goto out_fmt; 2117884d179dSJan Kara } 2118884d179dSJan Kara if (IS_RDONLY(inode)) { 2119884d179dSJan Kara error = -EROFS; 2120884d179dSJan Kara goto out_fmt; 2121884d179dSJan Kara } 2122884d179dSJan Kara if (!sb->s_op->quota_write || !sb->s_op->quota_read) { 2123884d179dSJan Kara error = -EINVAL; 2124884d179dSJan Kara goto out_fmt; 2125884d179dSJan Kara } 2126884d179dSJan Kara /* Usage always has to be set... */ 2127884d179dSJan Kara if (!(flags & DQUOT_USAGE_ENABLED)) { 2128884d179dSJan Kara error = -EINVAL; 2129884d179dSJan Kara goto out_fmt; 2130884d179dSJan Kara } 2131884d179dSJan Kara 2132884d179dSJan Kara if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) { 2133ab94c39bSJan Kara /* As we bypass the pagecache we must now flush all the 2134ab94c39bSJan Kara * dirty data and invalidate caches so that kernel sees 2135ab94c39bSJan Kara * changes from userspace. It is not enough to just flush 2136ab94c39bSJan Kara * the quota file since if blocksize < pagesize, invalidation 2137ab94c39bSJan Kara * of the cache could fail because of other unrelated dirty 2138ab94c39bSJan Kara * data */ 2139ab94c39bSJan Kara sync_filesystem(sb); 2140884d179dSJan Kara invalidate_bdev(sb->s_bdev); 2141884d179dSJan Kara } 2142884d179dSJan Kara mutex_lock(&dqopt->dqonoff_mutex); 2143884d179dSJan Kara if (sb_has_quota_loaded(sb, type)) { 2144884d179dSJan Kara error = -EBUSY; 2145884d179dSJan Kara goto out_lock; 2146884d179dSJan Kara } 2147884d179dSJan Kara 2148884d179dSJan Kara if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) { 2149884d179dSJan Kara /* We don't want quota and atime on quota files (deadlocks 2150884d179dSJan Kara * possible) Also nobody should write to the file - we use 2151884d179dSJan Kara * special IO operations which ignore the immutable bit. */ 2152a80b12c3SJan Kara mutex_lock(&inode->i_mutex); 2153268157baSJan Kara oldflags = inode->i_flags & (S_NOATIME | S_IMMUTABLE | 2154268157baSJan Kara S_NOQUOTA); 2155884d179dSJan Kara inode->i_flags |= S_NOQUOTA | S_NOATIME | S_IMMUTABLE; 2156dee86565SJan Kara mutex_unlock(&inode->i_mutex); 215726245c94SJan Kara /* 215826245c94SJan Kara * When S_NOQUOTA is set, remove dquot references as no more 215926245c94SJan Kara * references can be added 216026245c94SJan Kara */ 21619f754758SChristoph Hellwig __dquot_drop(inode); 2162884d179dSJan Kara } 2163884d179dSJan Kara 2164884d179dSJan Kara error = -EIO; 2165884d179dSJan Kara dqopt->files[type] = igrab(inode); 2166884d179dSJan Kara if (!dqopt->files[type]) 2167884d179dSJan Kara goto out_lock; 2168884d179dSJan Kara error = -EINVAL; 2169884d179dSJan Kara if (!fmt->qf_ops->check_quota_file(sb, type)) 2170884d179dSJan Kara goto out_file_init; 2171884d179dSJan Kara 2172884d179dSJan Kara dqopt->ops[type] = fmt->qf_ops; 2173884d179dSJan Kara dqopt->info[type].dqi_format = fmt; 2174884d179dSJan Kara dqopt->info[type].dqi_fmt_id = format_id; 2175884d179dSJan Kara INIT_LIST_HEAD(&dqopt->info[type].dqi_dirty_list); 2176884d179dSJan Kara mutex_lock(&dqopt->dqio_mutex); 2177268157baSJan Kara error = dqopt->ops[type]->read_file_info(sb, type); 2178268157baSJan Kara if (error < 0) { 2179884d179dSJan Kara mutex_unlock(&dqopt->dqio_mutex); 2180884d179dSJan Kara goto out_file_init; 2181884d179dSJan Kara } 218246fe44ceSJan Kara if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) 218346fe44ceSJan Kara dqopt->info[type].dqi_flags |= DQF_SYS_FILE; 2184884d179dSJan Kara mutex_unlock(&dqopt->dqio_mutex); 2185884d179dSJan Kara spin_lock(&dq_state_lock); 2186884d179dSJan Kara dqopt->flags |= dquot_state_flag(flags, type); 2187884d179dSJan Kara spin_unlock(&dq_state_lock); 2188884d179dSJan Kara 2189884d179dSJan Kara add_dquot_ref(sb, type); 2190884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 2191884d179dSJan Kara 2192884d179dSJan Kara return 0; 2193884d179dSJan Kara 2194884d179dSJan Kara out_file_init: 2195884d179dSJan Kara dqopt->files[type] = NULL; 2196884d179dSJan Kara iput(inode); 2197884d179dSJan Kara out_lock: 2198884d179dSJan Kara if (oldflags != -1) { 2199a80b12c3SJan Kara mutex_lock(&inode->i_mutex); 2200884d179dSJan Kara /* Set the flags back (in the case of accidental quotaon() 2201884d179dSJan Kara * on a wrong file we don't want to mess up the flags) */ 2202884d179dSJan Kara inode->i_flags &= ~(S_NOATIME | S_NOQUOTA | S_IMMUTABLE); 2203884d179dSJan Kara inode->i_flags |= oldflags; 2204dee86565SJan Kara mutex_unlock(&inode->i_mutex); 2205884d179dSJan Kara } 2206d01730d7SJiaying Zhang mutex_unlock(&dqopt->dqonoff_mutex); 2207884d179dSJan Kara out_fmt: 2208884d179dSJan Kara put_quota_format(fmt); 2209884d179dSJan Kara 2210884d179dSJan Kara return error; 2211884d179dSJan Kara } 2212884d179dSJan Kara 2213884d179dSJan Kara /* Reenable quotas on remount RW */ 22140f0dd62fSChristoph Hellwig int dquot_resume(struct super_block *sb, int type) 2215884d179dSJan Kara { 2216884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 2217884d179dSJan Kara struct inode *inode; 22180f0dd62fSChristoph Hellwig int ret = 0, cnt; 2219884d179dSJan Kara unsigned int flags; 2220884d179dSJan Kara 22210f0dd62fSChristoph Hellwig for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 22220f0dd62fSChristoph Hellwig if (type != -1 && cnt != type) 22230f0dd62fSChristoph Hellwig continue; 22240f0dd62fSChristoph Hellwig 2225884d179dSJan Kara mutex_lock(&dqopt->dqonoff_mutex); 22260f0dd62fSChristoph Hellwig if (!sb_has_quota_suspended(sb, cnt)) { 2227884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 22280f0dd62fSChristoph Hellwig continue; 2229884d179dSJan Kara } 22300f0dd62fSChristoph Hellwig inode = dqopt->files[cnt]; 22310f0dd62fSChristoph Hellwig dqopt->files[cnt] = NULL; 2232884d179dSJan Kara spin_lock(&dq_state_lock); 2233884d179dSJan Kara flags = dqopt->flags & dquot_state_flag(DQUOT_USAGE_ENABLED | 22340f0dd62fSChristoph Hellwig DQUOT_LIMITS_ENABLED, 22350f0dd62fSChristoph Hellwig cnt); 22360f0dd62fSChristoph Hellwig dqopt->flags &= ~dquot_state_flag(DQUOT_STATE_FLAGS, cnt); 2237884d179dSJan Kara spin_unlock(&dq_state_lock); 2238884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 2239884d179dSJan Kara 22400f0dd62fSChristoph Hellwig flags = dquot_generic_flag(flags, cnt); 22410f0dd62fSChristoph Hellwig ret = vfs_load_quota_inode(inode, cnt, 22420f0dd62fSChristoph Hellwig dqopt->info[cnt].dqi_fmt_id, flags); 2243884d179dSJan Kara iput(inode); 22440f0dd62fSChristoph Hellwig } 2245884d179dSJan Kara 2246884d179dSJan Kara return ret; 2247884d179dSJan Kara } 22480f0dd62fSChristoph Hellwig EXPORT_SYMBOL(dquot_resume); 2249884d179dSJan Kara 2250f00c9e44SJan Kara int dquot_quota_on(struct super_block *sb, int type, int format_id, 2251884d179dSJan Kara struct path *path) 2252884d179dSJan Kara { 2253884d179dSJan Kara int error = security_quota_on(path->dentry); 2254884d179dSJan Kara if (error) 2255884d179dSJan Kara return error; 2256884d179dSJan Kara /* Quota file not on the same filesystem? */ 2257d8c9584eSAl Viro if (path->dentry->d_sb != sb) 2258884d179dSJan Kara error = -EXDEV; 2259884d179dSJan Kara else 2260884d179dSJan Kara error = vfs_load_quota_inode(path->dentry->d_inode, type, 2261884d179dSJan Kara format_id, DQUOT_USAGE_ENABLED | 2262884d179dSJan Kara DQUOT_LIMITS_ENABLED); 2263884d179dSJan Kara return error; 2264884d179dSJan Kara } 2265287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_quota_on); 2266884d179dSJan Kara 2267884d179dSJan Kara /* 2268884d179dSJan Kara * More powerful function for turning on quotas allowing setting 2269884d179dSJan Kara * of individual quota flags 2270884d179dSJan Kara */ 2271287a8095SChristoph Hellwig int dquot_enable(struct inode *inode, int type, int format_id, 2272884d179dSJan Kara unsigned int flags) 2273884d179dSJan Kara { 2274884d179dSJan Kara int ret = 0; 2275884d179dSJan Kara struct super_block *sb = inode->i_sb; 2276884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 2277884d179dSJan Kara 2278884d179dSJan Kara /* Just unsuspend quotas? */ 22790f0dd62fSChristoph Hellwig BUG_ON(flags & DQUOT_SUSPENDED); 22800f0dd62fSChristoph Hellwig 2281884d179dSJan Kara if (!flags) 2282884d179dSJan Kara return 0; 2283884d179dSJan Kara /* Just updating flags needed? */ 2284884d179dSJan Kara if (sb_has_quota_loaded(sb, type)) { 2285884d179dSJan Kara mutex_lock(&dqopt->dqonoff_mutex); 2286884d179dSJan Kara /* Now do a reliable test... */ 2287884d179dSJan Kara if (!sb_has_quota_loaded(sb, type)) { 2288884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 2289884d179dSJan Kara goto load_quota; 2290884d179dSJan Kara } 2291884d179dSJan Kara if (flags & DQUOT_USAGE_ENABLED && 2292884d179dSJan Kara sb_has_quota_usage_enabled(sb, type)) { 2293884d179dSJan Kara ret = -EBUSY; 2294884d179dSJan Kara goto out_lock; 2295884d179dSJan Kara } 2296884d179dSJan Kara if (flags & DQUOT_LIMITS_ENABLED && 2297884d179dSJan Kara sb_has_quota_limits_enabled(sb, type)) { 2298884d179dSJan Kara ret = -EBUSY; 2299884d179dSJan Kara goto out_lock; 2300884d179dSJan Kara } 2301884d179dSJan Kara spin_lock(&dq_state_lock); 2302884d179dSJan Kara sb_dqopt(sb)->flags |= dquot_state_flag(flags, type); 2303884d179dSJan Kara spin_unlock(&dq_state_lock); 2304884d179dSJan Kara out_lock: 2305884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 2306884d179dSJan Kara return ret; 2307884d179dSJan Kara } 2308884d179dSJan Kara 2309884d179dSJan Kara load_quota: 2310884d179dSJan Kara return vfs_load_quota_inode(inode, type, format_id, flags); 2311884d179dSJan Kara } 2312287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_enable); 2313884d179dSJan Kara 2314884d179dSJan Kara /* 2315884d179dSJan Kara * This function is used when filesystem needs to initialize quotas 2316884d179dSJan Kara * during mount time. 2317884d179dSJan Kara */ 2318287a8095SChristoph Hellwig int dquot_quota_on_mount(struct super_block *sb, char *qf_name, 2319884d179dSJan Kara int format_id, int type) 2320884d179dSJan Kara { 2321884d179dSJan Kara struct dentry *dentry; 2322884d179dSJan Kara int error; 2323884d179dSJan Kara 2324c56818d7SJan Kara mutex_lock(&sb->s_root->d_inode->i_mutex); 2325884d179dSJan Kara dentry = lookup_one_len(qf_name, sb->s_root, strlen(qf_name)); 2326c56818d7SJan Kara mutex_unlock(&sb->s_root->d_inode->i_mutex); 2327884d179dSJan Kara if (IS_ERR(dentry)) 2328884d179dSJan Kara return PTR_ERR(dentry); 2329884d179dSJan Kara 2330884d179dSJan Kara if (!dentry->d_inode) { 2331884d179dSJan Kara error = -ENOENT; 2332884d179dSJan Kara goto out; 2333884d179dSJan Kara } 2334884d179dSJan Kara 2335884d179dSJan Kara error = security_quota_on(dentry); 2336884d179dSJan Kara if (!error) 2337884d179dSJan Kara error = vfs_load_quota_inode(dentry->d_inode, type, format_id, 2338884d179dSJan Kara DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); 2339884d179dSJan Kara 2340884d179dSJan Kara out: 2341884d179dSJan Kara dput(dentry); 2342884d179dSJan Kara return error; 2343884d179dSJan Kara } 2344287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_quota_on_mount); 2345884d179dSJan Kara 2346884d179dSJan Kara static inline qsize_t qbtos(qsize_t blocks) 2347884d179dSJan Kara { 2348884d179dSJan Kara return blocks << QIF_DQBLKSIZE_BITS; 2349884d179dSJan Kara } 2350884d179dSJan Kara 2351884d179dSJan Kara static inline qsize_t stoqb(qsize_t space) 2352884d179dSJan Kara { 2353884d179dSJan Kara return (space + QIF_DQBLKSIZE - 1) >> QIF_DQBLKSIZE_BITS; 2354884d179dSJan Kara } 2355884d179dSJan Kara 2356884d179dSJan Kara /* Generic routine for getting common part of quota structure */ 2357b9b2dd36SChristoph Hellwig static void do_get_dqblk(struct dquot *dquot, struct fs_disk_quota *di) 2358884d179dSJan Kara { 2359884d179dSJan Kara struct mem_dqblk *dm = &dquot->dq_dqb; 2360884d179dSJan Kara 2361b9b2dd36SChristoph Hellwig memset(di, 0, sizeof(*di)); 2362b9b2dd36SChristoph Hellwig di->d_version = FS_DQUOT_VERSION; 2363b9b2dd36SChristoph Hellwig di->d_flags = dquot->dq_type == USRQUOTA ? 2364ade7ce31SChristoph Hellwig FS_USER_QUOTA : FS_GROUP_QUOTA; 2365b9b2dd36SChristoph Hellwig di->d_id = dquot->dq_id; 2366b9b2dd36SChristoph Hellwig 2367884d179dSJan Kara spin_lock(&dq_data_lock); 2368b9b2dd36SChristoph Hellwig di->d_blk_hardlimit = stoqb(dm->dqb_bhardlimit); 2369b9b2dd36SChristoph Hellwig di->d_blk_softlimit = stoqb(dm->dqb_bsoftlimit); 2370b9b2dd36SChristoph Hellwig di->d_ino_hardlimit = dm->dqb_ihardlimit; 2371b9b2dd36SChristoph Hellwig di->d_ino_softlimit = dm->dqb_isoftlimit; 2372b9b2dd36SChristoph Hellwig di->d_bcount = dm->dqb_curspace + dm->dqb_rsvspace; 2373b9b2dd36SChristoph Hellwig di->d_icount = dm->dqb_curinodes; 2374b9b2dd36SChristoph Hellwig di->d_btimer = dm->dqb_btime; 2375b9b2dd36SChristoph Hellwig di->d_itimer = dm->dqb_itime; 2376884d179dSJan Kara spin_unlock(&dq_data_lock); 2377884d179dSJan Kara } 2378884d179dSJan Kara 2379287a8095SChristoph Hellwig int dquot_get_dqblk(struct super_block *sb, int type, qid_t id, 2380b9b2dd36SChristoph Hellwig struct fs_disk_quota *di) 2381884d179dSJan Kara { 2382884d179dSJan Kara struct dquot *dquot; 2383884d179dSJan Kara 2384884d179dSJan Kara dquot = dqget(sb, id, type); 2385dd6f3c6dSJan Kara if (!dquot) 2386884d179dSJan Kara return -ESRCH; 2387884d179dSJan Kara do_get_dqblk(dquot, di); 2388884d179dSJan Kara dqput(dquot); 2389884d179dSJan Kara 2390884d179dSJan Kara return 0; 2391884d179dSJan Kara } 2392287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_get_dqblk); 2393884d179dSJan Kara 2394c472b432SChristoph Hellwig #define VFS_FS_DQ_MASK \ 2395c472b432SChristoph Hellwig (FS_DQ_BCOUNT | FS_DQ_BSOFT | FS_DQ_BHARD | \ 2396c472b432SChristoph Hellwig FS_DQ_ICOUNT | FS_DQ_ISOFT | FS_DQ_IHARD | \ 2397c472b432SChristoph Hellwig FS_DQ_BTIMER | FS_DQ_ITIMER) 2398c472b432SChristoph Hellwig 2399884d179dSJan Kara /* Generic routine for setting common part of quota structure */ 2400c472b432SChristoph Hellwig static int do_set_dqblk(struct dquot *dquot, struct fs_disk_quota *di) 2401884d179dSJan Kara { 2402884d179dSJan Kara struct mem_dqblk *dm = &dquot->dq_dqb; 2403884d179dSJan Kara int check_blim = 0, check_ilim = 0; 2404884d179dSJan Kara struct mem_dqinfo *dqi = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_type]; 2405884d179dSJan Kara 2406c472b432SChristoph Hellwig if (di->d_fieldmask & ~VFS_FS_DQ_MASK) 2407c472b432SChristoph Hellwig return -EINVAL; 2408c472b432SChristoph Hellwig 2409c472b432SChristoph Hellwig if (((di->d_fieldmask & FS_DQ_BSOFT) && 2410c472b432SChristoph Hellwig (di->d_blk_softlimit > dqi->dqi_maxblimit)) || 2411c472b432SChristoph Hellwig ((di->d_fieldmask & FS_DQ_BHARD) && 2412c472b432SChristoph Hellwig (di->d_blk_hardlimit > dqi->dqi_maxblimit)) || 2413c472b432SChristoph Hellwig ((di->d_fieldmask & FS_DQ_ISOFT) && 2414c472b432SChristoph Hellwig (di->d_ino_softlimit > dqi->dqi_maxilimit)) || 2415c472b432SChristoph Hellwig ((di->d_fieldmask & FS_DQ_IHARD) && 2416c472b432SChristoph Hellwig (di->d_ino_hardlimit > dqi->dqi_maxilimit))) 2417884d179dSJan Kara return -ERANGE; 2418884d179dSJan Kara 2419884d179dSJan Kara spin_lock(&dq_data_lock); 2420c472b432SChristoph Hellwig if (di->d_fieldmask & FS_DQ_BCOUNT) { 2421c472b432SChristoph Hellwig dm->dqb_curspace = di->d_bcount - dm->dqb_rsvspace; 2422884d179dSJan Kara check_blim = 1; 242308261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags); 2424884d179dSJan Kara } 2425c472b432SChristoph Hellwig 2426c472b432SChristoph Hellwig if (di->d_fieldmask & FS_DQ_BSOFT) 2427c472b432SChristoph Hellwig dm->dqb_bsoftlimit = qbtos(di->d_blk_softlimit); 2428c472b432SChristoph Hellwig if (di->d_fieldmask & FS_DQ_BHARD) 2429c472b432SChristoph Hellwig dm->dqb_bhardlimit = qbtos(di->d_blk_hardlimit); 2430c472b432SChristoph Hellwig if (di->d_fieldmask & (FS_DQ_BSOFT | FS_DQ_BHARD)) { 2431884d179dSJan Kara check_blim = 1; 243208261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags); 2433884d179dSJan Kara } 2434c472b432SChristoph Hellwig 2435c472b432SChristoph Hellwig if (di->d_fieldmask & FS_DQ_ICOUNT) { 2436c472b432SChristoph Hellwig dm->dqb_curinodes = di->d_icount; 2437884d179dSJan Kara check_ilim = 1; 243808261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags); 2439884d179dSJan Kara } 2440c472b432SChristoph Hellwig 2441c472b432SChristoph Hellwig if (di->d_fieldmask & FS_DQ_ISOFT) 2442c472b432SChristoph Hellwig dm->dqb_isoftlimit = di->d_ino_softlimit; 2443c472b432SChristoph Hellwig if (di->d_fieldmask & FS_DQ_IHARD) 2444c472b432SChristoph Hellwig dm->dqb_ihardlimit = di->d_ino_hardlimit; 2445c472b432SChristoph Hellwig if (di->d_fieldmask & (FS_DQ_ISOFT | FS_DQ_IHARD)) { 2446884d179dSJan Kara check_ilim = 1; 244708261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags); 2448884d179dSJan Kara } 2449c472b432SChristoph Hellwig 2450c472b432SChristoph Hellwig if (di->d_fieldmask & FS_DQ_BTIMER) { 2451c472b432SChristoph Hellwig dm->dqb_btime = di->d_btimer; 2452884d179dSJan Kara check_blim = 1; 245308261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags); 2454884d179dSJan Kara } 2455c472b432SChristoph Hellwig 2456c472b432SChristoph Hellwig if (di->d_fieldmask & FS_DQ_ITIMER) { 2457c472b432SChristoph Hellwig dm->dqb_itime = di->d_itimer; 2458884d179dSJan Kara check_ilim = 1; 245908261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags); 2460884d179dSJan Kara } 2461884d179dSJan Kara 2462884d179dSJan Kara if (check_blim) { 2463268157baSJan Kara if (!dm->dqb_bsoftlimit || 2464268157baSJan Kara dm->dqb_curspace < dm->dqb_bsoftlimit) { 2465884d179dSJan Kara dm->dqb_btime = 0; 2466884d179dSJan Kara clear_bit(DQ_BLKS_B, &dquot->dq_flags); 2467c472b432SChristoph Hellwig } else if (!(di->d_fieldmask & FS_DQ_BTIMER)) 2468268157baSJan Kara /* Set grace only if user hasn't provided his own... */ 2469884d179dSJan Kara dm->dqb_btime = get_seconds() + dqi->dqi_bgrace; 2470884d179dSJan Kara } 2471884d179dSJan Kara if (check_ilim) { 2472268157baSJan Kara if (!dm->dqb_isoftlimit || 2473268157baSJan Kara dm->dqb_curinodes < dm->dqb_isoftlimit) { 2474884d179dSJan Kara dm->dqb_itime = 0; 2475884d179dSJan Kara clear_bit(DQ_INODES_B, &dquot->dq_flags); 2476c472b432SChristoph Hellwig } else if (!(di->d_fieldmask & FS_DQ_ITIMER)) 2477268157baSJan Kara /* Set grace only if user hasn't provided his own... */ 2478884d179dSJan Kara dm->dqb_itime = get_seconds() + dqi->dqi_igrace; 2479884d179dSJan Kara } 2480268157baSJan Kara if (dm->dqb_bhardlimit || dm->dqb_bsoftlimit || dm->dqb_ihardlimit || 2481268157baSJan Kara dm->dqb_isoftlimit) 2482884d179dSJan Kara clear_bit(DQ_FAKE_B, &dquot->dq_flags); 2483884d179dSJan Kara else 2484884d179dSJan Kara set_bit(DQ_FAKE_B, &dquot->dq_flags); 2485884d179dSJan Kara spin_unlock(&dq_data_lock); 2486884d179dSJan Kara mark_dquot_dirty(dquot); 2487884d179dSJan Kara 2488884d179dSJan Kara return 0; 2489884d179dSJan Kara } 2490884d179dSJan Kara 2491287a8095SChristoph Hellwig int dquot_set_dqblk(struct super_block *sb, int type, qid_t id, 2492c472b432SChristoph Hellwig struct fs_disk_quota *di) 2493884d179dSJan Kara { 2494884d179dSJan Kara struct dquot *dquot; 2495884d179dSJan Kara int rc; 2496884d179dSJan Kara 2497884d179dSJan Kara dquot = dqget(sb, id, type); 2498884d179dSJan Kara if (!dquot) { 2499884d179dSJan Kara rc = -ESRCH; 2500884d179dSJan Kara goto out; 2501884d179dSJan Kara } 2502884d179dSJan Kara rc = do_set_dqblk(dquot, di); 2503884d179dSJan Kara dqput(dquot); 2504884d179dSJan Kara out: 2505884d179dSJan Kara return rc; 2506884d179dSJan Kara } 2507287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_set_dqblk); 2508884d179dSJan Kara 2509884d179dSJan Kara /* Generic routine for getting common part of quota file information */ 2510287a8095SChristoph Hellwig int dquot_get_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii) 2511884d179dSJan Kara { 2512884d179dSJan Kara struct mem_dqinfo *mi; 2513884d179dSJan Kara 2514884d179dSJan Kara mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); 2515884d179dSJan Kara if (!sb_has_quota_active(sb, type)) { 2516884d179dSJan Kara mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); 2517884d179dSJan Kara return -ESRCH; 2518884d179dSJan Kara } 2519884d179dSJan Kara mi = sb_dqopt(sb)->info + type; 2520884d179dSJan Kara spin_lock(&dq_data_lock); 2521884d179dSJan Kara ii->dqi_bgrace = mi->dqi_bgrace; 2522884d179dSJan Kara ii->dqi_igrace = mi->dqi_igrace; 252346fe44ceSJan Kara ii->dqi_flags = mi->dqi_flags & DQF_GETINFO_MASK; 2524884d179dSJan Kara ii->dqi_valid = IIF_ALL; 2525884d179dSJan Kara spin_unlock(&dq_data_lock); 2526884d179dSJan Kara mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); 2527884d179dSJan Kara return 0; 2528884d179dSJan Kara } 2529287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_get_dqinfo); 2530884d179dSJan Kara 2531884d179dSJan Kara /* Generic routine for setting common part of quota file information */ 2532287a8095SChristoph Hellwig int dquot_set_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii) 2533884d179dSJan Kara { 2534884d179dSJan Kara struct mem_dqinfo *mi; 2535884d179dSJan Kara int err = 0; 2536884d179dSJan Kara 2537884d179dSJan Kara mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); 2538884d179dSJan Kara if (!sb_has_quota_active(sb, type)) { 2539884d179dSJan Kara err = -ESRCH; 2540884d179dSJan Kara goto out; 2541884d179dSJan Kara } 2542884d179dSJan Kara mi = sb_dqopt(sb)->info + type; 2543884d179dSJan Kara spin_lock(&dq_data_lock); 2544884d179dSJan Kara if (ii->dqi_valid & IIF_BGRACE) 2545884d179dSJan Kara mi->dqi_bgrace = ii->dqi_bgrace; 2546884d179dSJan Kara if (ii->dqi_valid & IIF_IGRACE) 2547884d179dSJan Kara mi->dqi_igrace = ii->dqi_igrace; 2548884d179dSJan Kara if (ii->dqi_valid & IIF_FLAGS) 254946fe44ceSJan Kara mi->dqi_flags = (mi->dqi_flags & ~DQF_SETINFO_MASK) | 255046fe44ceSJan Kara (ii->dqi_flags & DQF_SETINFO_MASK); 2551884d179dSJan Kara spin_unlock(&dq_data_lock); 2552884d179dSJan Kara mark_info_dirty(sb, type); 2553884d179dSJan Kara /* Force write to disk */ 2554884d179dSJan Kara sb->dq_op->write_info(sb, type); 2555884d179dSJan Kara out: 2556884d179dSJan Kara mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); 2557884d179dSJan Kara return err; 2558884d179dSJan Kara } 2559287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_set_dqinfo); 2560884d179dSJan Kara 2561287a8095SChristoph Hellwig const struct quotactl_ops dquot_quotactl_ops = { 2562287a8095SChristoph Hellwig .quota_on = dquot_quota_on, 2563287a8095SChristoph Hellwig .quota_off = dquot_quota_off, 2564287a8095SChristoph Hellwig .quota_sync = dquot_quota_sync, 2565287a8095SChristoph Hellwig .get_info = dquot_get_dqinfo, 2566287a8095SChristoph Hellwig .set_info = dquot_set_dqinfo, 2567287a8095SChristoph Hellwig .get_dqblk = dquot_get_dqblk, 2568287a8095SChristoph Hellwig .set_dqblk = dquot_set_dqblk 2569884d179dSJan Kara }; 2570287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_quotactl_ops); 2571dde95888SDmitry Monakhov 2572dde95888SDmitry Monakhov static int do_proc_dqstats(struct ctl_table *table, int write, 2573dde95888SDmitry Monakhov void __user *buffer, size_t *lenp, loff_t *ppos) 2574dde95888SDmitry Monakhov { 2575dde95888SDmitry Monakhov unsigned int type = (int *)table->data - dqstats.stat; 2576f32764bdSDmitry Monakhov 2577f32764bdSDmitry Monakhov /* Update global table */ 2578f32764bdSDmitry Monakhov dqstats.stat[type] = 2579f32764bdSDmitry Monakhov percpu_counter_sum_positive(&dqstats.counter[type]); 2580dde95888SDmitry Monakhov return proc_dointvec(table, write, buffer, lenp, ppos); 2581dde95888SDmitry Monakhov } 2582dde95888SDmitry Monakhov 2583884d179dSJan Kara static ctl_table fs_dqstats_table[] = { 2584884d179dSJan Kara { 2585884d179dSJan Kara .procname = "lookups", 2586dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_LOOKUPS], 2587884d179dSJan Kara .maxlen = sizeof(int), 2588884d179dSJan Kara .mode = 0444, 2589dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2590884d179dSJan Kara }, 2591884d179dSJan Kara { 2592884d179dSJan Kara .procname = "drops", 2593dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_DROPS], 2594884d179dSJan Kara .maxlen = sizeof(int), 2595884d179dSJan Kara .mode = 0444, 2596dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2597884d179dSJan Kara }, 2598884d179dSJan Kara { 2599884d179dSJan Kara .procname = "reads", 2600dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_READS], 2601884d179dSJan Kara .maxlen = sizeof(int), 2602884d179dSJan Kara .mode = 0444, 2603dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2604884d179dSJan Kara }, 2605884d179dSJan Kara { 2606884d179dSJan Kara .procname = "writes", 2607dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_WRITES], 2608884d179dSJan Kara .maxlen = sizeof(int), 2609884d179dSJan Kara .mode = 0444, 2610dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2611884d179dSJan Kara }, 2612884d179dSJan Kara { 2613884d179dSJan Kara .procname = "cache_hits", 2614dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_CACHE_HITS], 2615884d179dSJan Kara .maxlen = sizeof(int), 2616884d179dSJan Kara .mode = 0444, 2617dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2618884d179dSJan Kara }, 2619884d179dSJan Kara { 2620884d179dSJan Kara .procname = "allocated_dquots", 2621dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_ALLOC_DQUOTS], 2622884d179dSJan Kara .maxlen = sizeof(int), 2623884d179dSJan Kara .mode = 0444, 2624dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2625884d179dSJan Kara }, 2626884d179dSJan Kara { 2627884d179dSJan Kara .procname = "free_dquots", 2628dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_FREE_DQUOTS], 2629884d179dSJan Kara .maxlen = sizeof(int), 2630884d179dSJan Kara .mode = 0444, 2631dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2632884d179dSJan Kara }, 2633884d179dSJan Kara { 2634884d179dSJan Kara .procname = "syncs", 2635dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_SYNCS], 2636884d179dSJan Kara .maxlen = sizeof(int), 2637884d179dSJan Kara .mode = 0444, 2638dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2639884d179dSJan Kara }, 2640884d179dSJan Kara #ifdef CONFIG_PRINT_QUOTA_WARNING 2641884d179dSJan Kara { 2642884d179dSJan Kara .procname = "warnings", 2643884d179dSJan Kara .data = &flag_print_warnings, 2644884d179dSJan Kara .maxlen = sizeof(int), 2645884d179dSJan Kara .mode = 0644, 26466d456111SEric W. Biederman .proc_handler = proc_dointvec, 2647884d179dSJan Kara }, 2648884d179dSJan Kara #endif 2649ab09203eSEric W. Biederman { }, 2650884d179dSJan Kara }; 2651884d179dSJan Kara 2652884d179dSJan Kara static ctl_table fs_table[] = { 2653884d179dSJan Kara { 2654884d179dSJan Kara .procname = "quota", 2655884d179dSJan Kara .mode = 0555, 2656884d179dSJan Kara .child = fs_dqstats_table, 2657884d179dSJan Kara }, 2658ab09203eSEric W. Biederman { }, 2659884d179dSJan Kara }; 2660884d179dSJan Kara 2661884d179dSJan Kara static ctl_table sys_table[] = { 2662884d179dSJan Kara { 2663884d179dSJan Kara .procname = "fs", 2664884d179dSJan Kara .mode = 0555, 2665884d179dSJan Kara .child = fs_table, 2666884d179dSJan Kara }, 2667ab09203eSEric W. Biederman { }, 2668884d179dSJan Kara }; 2669884d179dSJan Kara 2670884d179dSJan Kara static int __init dquot_init(void) 2671884d179dSJan Kara { 2672f32764bdSDmitry Monakhov int i, ret; 2673884d179dSJan Kara unsigned long nr_hash, order; 2674884d179dSJan Kara 2675884d179dSJan Kara printk(KERN_NOTICE "VFS: Disk quotas %s\n", __DQUOT_VERSION__); 2676884d179dSJan Kara 2677884d179dSJan Kara register_sysctl_table(sys_table); 2678884d179dSJan Kara 2679884d179dSJan Kara dquot_cachep = kmem_cache_create("dquot", 2680884d179dSJan Kara sizeof(struct dquot), sizeof(unsigned long) * 4, 2681884d179dSJan Kara (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| 2682884d179dSJan Kara SLAB_MEM_SPREAD|SLAB_PANIC), 2683884d179dSJan Kara NULL); 2684884d179dSJan Kara 2685884d179dSJan Kara order = 0; 2686884d179dSJan Kara dquot_hash = (struct hlist_head *)__get_free_pages(GFP_ATOMIC, order); 2687884d179dSJan Kara if (!dquot_hash) 2688884d179dSJan Kara panic("Cannot create dquot hash table"); 2689884d179dSJan Kara 2690f32764bdSDmitry Monakhov for (i = 0; i < _DQST_DQSTAT_LAST; i++) { 2691f32764bdSDmitry Monakhov ret = percpu_counter_init(&dqstats.counter[i], 0); 2692f32764bdSDmitry Monakhov if (ret) 2693f32764bdSDmitry Monakhov panic("Cannot create dquot stat counters"); 2694f32764bdSDmitry Monakhov } 2695dde95888SDmitry Monakhov 2696884d179dSJan Kara /* Find power-of-two hlist_heads which can fit into allocation */ 2697884d179dSJan Kara nr_hash = (1UL << order) * PAGE_SIZE / sizeof(struct hlist_head); 2698884d179dSJan Kara dq_hash_bits = 0; 2699884d179dSJan Kara do { 2700884d179dSJan Kara dq_hash_bits++; 2701884d179dSJan Kara } while (nr_hash >> dq_hash_bits); 2702884d179dSJan Kara dq_hash_bits--; 2703884d179dSJan Kara 2704884d179dSJan Kara nr_hash = 1UL << dq_hash_bits; 2705884d179dSJan Kara dq_hash_mask = nr_hash - 1; 2706884d179dSJan Kara for (i = 0; i < nr_hash; i++) 2707884d179dSJan Kara INIT_HLIST_HEAD(dquot_hash + i); 2708884d179dSJan Kara 2709884d179dSJan Kara printk("Dquot-cache hash table entries: %ld (order %ld, %ld bytes)\n", 2710884d179dSJan Kara nr_hash, order, (PAGE_SIZE << order)); 2711884d179dSJan Kara 2712884d179dSJan Kara register_shrinker(&dqcache_shrinker); 2713884d179dSJan Kara 2714884d179dSJan Kara return 0; 2715884d179dSJan Kara } 2716884d179dSJan Kara module_init(dquot_init); 2717