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 81884d179dSJan Kara #include <asm/uaccess.h> 82884d179dSJan Kara 83884d179dSJan Kara /* 84884d179dSJan Kara * There are three quota SMP locks. dq_list_lock protects all lists with quotas 85dde95888SDmitry Monakhov * and quota formats. 86884d179dSJan Kara * dq_data_lock protects data from dq_dqb and also mem_dqinfo structures and 87884d179dSJan Kara * also guards consistency of dquot->dq_dqb with inode->i_blocks, i_bytes. 88884d179dSJan Kara * i_blocks and i_bytes updates itself are guarded by i_lock acquired directly 89884d179dSJan Kara * in inode_add_bytes() and inode_sub_bytes(). dq_state_lock protects 90884d179dSJan Kara * modifications of quota state (on quotaon and quotaoff) and readers who care 91884d179dSJan Kara * about latest values take it as well. 92884d179dSJan Kara * 93884d179dSJan Kara * The spinlock ordering is hence: dq_data_lock > dq_list_lock > i_lock, 94884d179dSJan Kara * dq_list_lock > dq_state_lock 95884d179dSJan Kara * 96884d179dSJan Kara * Note that some things (eg. sb pointer, type, id) doesn't change during 97884d179dSJan Kara * the life of the dquot structure and so needn't to be protected by a lock 98884d179dSJan Kara * 99884d179dSJan Kara * Any operation working on dquots via inode pointers must hold dqptr_sem. If 100884d179dSJan Kara * operation is just reading pointers from inode (or not using them at all) the 10126245c94SJan Kara * read lock is enough. If pointers are altered function must hold write lock. 10226245c94SJan Kara * Special care needs to be taken about S_NOQUOTA inode flag (marking that 10326245c94SJan Kara * inode is a quota file). Functions adding pointers from inode to dquots have 10426245c94SJan Kara * to check this flag under dqptr_sem and then (if S_NOQUOTA is not set) they 10526245c94SJan Kara * have to do all pointer modifications before dropping dqptr_sem. This makes 10626245c94SJan Kara * sure they cannot race with quotaon which first sets S_NOQUOTA flag and 10726245c94SJan Kara * then drops all pointers to dquots from an inode. 108884d179dSJan Kara * 109884d179dSJan Kara * Each dquot has its dq_lock mutex. Locked dquots might not be referenced 110884d179dSJan Kara * from inodes (dquot_alloc_space() and such don't check the dq_lock). 111884d179dSJan Kara * Currently dquot is locked only when it is being read to memory (or space for 112884d179dSJan Kara * it is being allocated) on the first dqget() and when it is being released on 113884d179dSJan Kara * the last dqput(). The allocation and release oparations are serialized by 114884d179dSJan Kara * the dq_lock and by checking the use count in dquot_release(). Write 115884d179dSJan Kara * operations on dquots don't hold dq_lock as they copy data under dq_data_lock 116884d179dSJan Kara * spinlock to internal buffers before writing. 117884d179dSJan Kara * 118884d179dSJan Kara * Lock ordering (including related VFS locks) is the following: 119*a80b12c3SJan Kara * dqonoff_mutex > i_mutex > journal_lock > dqptr_sem > dquot->dq_lock > 120884d179dSJan Kara * dqio_mutex 121*a80b12c3SJan 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 598287a8095SChristoph Hellwig int dquot_quota_sync(struct super_block *sb, int type, int wait) 599884d179dSJan Kara { 600884d179dSJan Kara struct list_head *dirty; 601884d179dSJan Kara struct dquot *dquot; 602884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 603884d179dSJan Kara int cnt; 604884d179dSJan Kara 605884d179dSJan Kara mutex_lock(&dqopt->dqonoff_mutex); 606884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 607884d179dSJan Kara if (type != -1 && cnt != type) 608884d179dSJan Kara continue; 609884d179dSJan Kara if (!sb_has_quota_active(sb, cnt)) 610884d179dSJan Kara continue; 611884d179dSJan Kara spin_lock(&dq_list_lock); 612884d179dSJan Kara dirty = &dqopt->info[cnt].dqi_dirty_list; 613884d179dSJan Kara while (!list_empty(dirty)) { 614268157baSJan Kara dquot = list_first_entry(dirty, struct dquot, 615268157baSJan Kara dq_dirty); 616884d179dSJan Kara /* Dirty and inactive can be only bad dquot... */ 617884d179dSJan Kara if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { 618884d179dSJan Kara clear_dquot_dirty(dquot); 619884d179dSJan Kara continue; 620884d179dSJan Kara } 621884d179dSJan Kara /* Now we have active dquot from which someone is 622884d179dSJan Kara * holding reference so we can safely just increase 623884d179dSJan Kara * use count */ 624884d179dSJan Kara atomic_inc(&dquot->dq_count); 625884d179dSJan Kara spin_unlock(&dq_list_lock); 626dde95888SDmitry Monakhov dqstats_inc(DQST_LOOKUPS); 627884d179dSJan Kara sb->dq_op->write_dquot(dquot); 628884d179dSJan Kara dqput(dquot); 629884d179dSJan Kara spin_lock(&dq_list_lock); 630884d179dSJan Kara } 631884d179dSJan Kara spin_unlock(&dq_list_lock); 632884d179dSJan Kara } 633884d179dSJan Kara 634884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 635884d179dSJan Kara if ((cnt == type || type == -1) && sb_has_quota_active(sb, cnt) 636884d179dSJan Kara && info_dirty(&dqopt->info[cnt])) 637884d179dSJan Kara sb->dq_op->write_info(sb, cnt); 638dde95888SDmitry Monakhov dqstats_inc(DQST_SYNCS); 639884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 640884d179dSJan Kara 641f9ef1784SJan Kara if (!wait || (dqopt->flags & DQUOT_QUOTA_SYS_FILE)) 6425fb324adSChristoph Hellwig return 0; 6435fb324adSChristoph Hellwig 6445fb324adSChristoph Hellwig /* This is not very clever (and fast) but currently I don't know about 6455fb324adSChristoph Hellwig * any other simple way of getting quota data to disk and we must get 6465fb324adSChristoph Hellwig * them there for userspace to be visible... */ 6475fb324adSChristoph Hellwig if (sb->s_op->sync_fs) 6485fb324adSChristoph Hellwig sb->s_op->sync_fs(sb, 1); 6495fb324adSChristoph Hellwig sync_blockdev(sb->s_bdev); 6505fb324adSChristoph Hellwig 6515fb324adSChristoph Hellwig /* 6525fb324adSChristoph Hellwig * Now when everything is written we can discard the pagecache so 6535fb324adSChristoph Hellwig * that userspace sees the changes. 6545fb324adSChristoph Hellwig */ 655f9ef1784SJan Kara mutex_lock(&dqopt->dqonoff_mutex); 6565fb324adSChristoph Hellwig for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 6575fb324adSChristoph Hellwig if (type != -1 && cnt != type) 6585fb324adSChristoph Hellwig continue; 6595fb324adSChristoph Hellwig if (!sb_has_quota_active(sb, cnt)) 6605fb324adSChristoph Hellwig continue; 661*a80b12c3SJan Kara mutex_lock(&dqopt->files[cnt]->i_mutex); 662f9ef1784SJan Kara truncate_inode_pages(&dqopt->files[cnt]->i_data, 0); 663f9ef1784SJan Kara mutex_unlock(&dqopt->files[cnt]->i_mutex); 6645fb324adSChristoph Hellwig } 665f9ef1784SJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 6665fb324adSChristoph Hellwig 667884d179dSJan Kara return 0; 668884d179dSJan Kara } 669287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_quota_sync); 670884d179dSJan Kara 671884d179dSJan Kara /* Free unused dquots from cache */ 672884d179dSJan Kara static void prune_dqcache(int count) 673884d179dSJan Kara { 674884d179dSJan Kara struct list_head *head; 675884d179dSJan Kara struct dquot *dquot; 676884d179dSJan Kara 677884d179dSJan Kara head = free_dquots.prev; 678884d179dSJan Kara while (head != &free_dquots && count) { 679884d179dSJan Kara dquot = list_entry(head, struct dquot, dq_free); 680884d179dSJan Kara remove_dquot_hash(dquot); 681884d179dSJan Kara remove_free_dquot(dquot); 682884d179dSJan Kara remove_inuse(dquot); 683884d179dSJan Kara do_destroy_dquot(dquot); 684884d179dSJan Kara count--; 685884d179dSJan Kara head = free_dquots.prev; 686884d179dSJan Kara } 687884d179dSJan Kara } 688884d179dSJan Kara 689884d179dSJan Kara /* 690884d179dSJan Kara * This is called from kswapd when we think we need some 691884d179dSJan Kara * more memory 692884d179dSJan Kara */ 6931495f230SYing Han static int shrink_dqcache_memory(struct shrinker *shrink, 6941495f230SYing Han struct shrink_control *sc) 695884d179dSJan Kara { 6961495f230SYing Han int nr = sc->nr_to_scan; 6971495f230SYing Han 698884d179dSJan Kara if (nr) { 699884d179dSJan Kara spin_lock(&dq_list_lock); 700884d179dSJan Kara prune_dqcache(nr); 701884d179dSJan Kara spin_unlock(&dq_list_lock); 702884d179dSJan Kara } 703f32764bdSDmitry Monakhov return ((unsigned) 704f32764bdSDmitry Monakhov percpu_counter_read_positive(&dqstats.counter[DQST_FREE_DQUOTS]) 705f32764bdSDmitry Monakhov /100) * sysctl_vfs_cache_pressure; 706884d179dSJan Kara } 707884d179dSJan Kara 708884d179dSJan Kara static struct shrinker dqcache_shrinker = { 709884d179dSJan Kara .shrink = shrink_dqcache_memory, 710884d179dSJan Kara .seeks = DEFAULT_SEEKS, 711884d179dSJan Kara }; 712884d179dSJan Kara 713884d179dSJan Kara /* 714884d179dSJan Kara * Put reference to dquot 715884d179dSJan Kara * NOTE: If you change this function please check whether dqput_blocks() works right... 716884d179dSJan Kara */ 717884d179dSJan Kara void dqput(struct dquot *dquot) 718884d179dSJan Kara { 719884d179dSJan Kara int ret; 720884d179dSJan Kara 721884d179dSJan Kara if (!dquot) 722884d179dSJan Kara return; 72362af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 724884d179dSJan Kara if (!atomic_read(&dquot->dq_count)) { 725fb5ffb0eSJiaying Zhang quota_error(dquot->dq_sb, "trying to free free dquot of %s %d", 726fb5ffb0eSJiaying Zhang quotatypes[dquot->dq_type], dquot->dq_id); 727884d179dSJan Kara BUG(); 728884d179dSJan Kara } 729884d179dSJan Kara #endif 730dde95888SDmitry Monakhov dqstats_inc(DQST_DROPS); 731884d179dSJan Kara we_slept: 732884d179dSJan Kara spin_lock(&dq_list_lock); 733884d179dSJan Kara if (atomic_read(&dquot->dq_count) > 1) { 734884d179dSJan Kara /* We have more than one user... nothing to do */ 735884d179dSJan Kara atomic_dec(&dquot->dq_count); 736884d179dSJan Kara /* Releasing dquot during quotaoff phase? */ 737884d179dSJan Kara if (!sb_has_quota_active(dquot->dq_sb, dquot->dq_type) && 738884d179dSJan Kara atomic_read(&dquot->dq_count) == 1) 739884d179dSJan Kara wake_up(&dquot->dq_wait_unused); 740884d179dSJan Kara spin_unlock(&dq_list_lock); 741884d179dSJan Kara return; 742884d179dSJan Kara } 743884d179dSJan Kara /* Need to release dquot? */ 744884d179dSJan Kara if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && dquot_dirty(dquot)) { 745884d179dSJan Kara spin_unlock(&dq_list_lock); 746884d179dSJan Kara /* Commit dquot before releasing */ 747884d179dSJan Kara ret = dquot->dq_sb->dq_op->write_dquot(dquot); 748884d179dSJan Kara if (ret < 0) { 749fb5ffb0eSJiaying Zhang quota_error(dquot->dq_sb, "Can't write quota structure" 750fb5ffb0eSJiaying Zhang " (error %d). Quota may get out of sync!", 751fb5ffb0eSJiaying Zhang ret); 752884d179dSJan Kara /* 753884d179dSJan Kara * We clear dirty bit anyway, so that we avoid 754884d179dSJan Kara * infinite loop here 755884d179dSJan Kara */ 756884d179dSJan Kara spin_lock(&dq_list_lock); 757884d179dSJan Kara clear_dquot_dirty(dquot); 758884d179dSJan Kara spin_unlock(&dq_list_lock); 759884d179dSJan Kara } 760884d179dSJan Kara goto we_slept; 761884d179dSJan Kara } 762884d179dSJan Kara /* Clear flag in case dquot was inactive (something bad happened) */ 763884d179dSJan Kara clear_dquot_dirty(dquot); 764884d179dSJan Kara if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { 765884d179dSJan Kara spin_unlock(&dq_list_lock); 766884d179dSJan Kara dquot->dq_sb->dq_op->release_dquot(dquot); 767884d179dSJan Kara goto we_slept; 768884d179dSJan Kara } 769884d179dSJan Kara atomic_dec(&dquot->dq_count); 77062af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 771884d179dSJan Kara /* sanity check */ 772884d179dSJan Kara BUG_ON(!list_empty(&dquot->dq_free)); 773884d179dSJan Kara #endif 774884d179dSJan Kara put_dquot_last(dquot); 775884d179dSJan Kara spin_unlock(&dq_list_lock); 776884d179dSJan Kara } 777884d179dSJan Kara EXPORT_SYMBOL(dqput); 778884d179dSJan Kara 779884d179dSJan Kara struct dquot *dquot_alloc(struct super_block *sb, int type) 780884d179dSJan Kara { 781884d179dSJan Kara return kmem_cache_zalloc(dquot_cachep, GFP_NOFS); 782884d179dSJan Kara } 783884d179dSJan Kara EXPORT_SYMBOL(dquot_alloc); 784884d179dSJan Kara 785884d179dSJan Kara static struct dquot *get_empty_dquot(struct super_block *sb, int type) 786884d179dSJan Kara { 787884d179dSJan Kara struct dquot *dquot; 788884d179dSJan Kara 789884d179dSJan Kara dquot = sb->dq_op->alloc_dquot(sb, type); 790884d179dSJan Kara if(!dquot) 791dd6f3c6dSJan Kara return NULL; 792884d179dSJan Kara 793884d179dSJan Kara mutex_init(&dquot->dq_lock); 794884d179dSJan Kara INIT_LIST_HEAD(&dquot->dq_free); 795884d179dSJan Kara INIT_LIST_HEAD(&dquot->dq_inuse); 796884d179dSJan Kara INIT_HLIST_NODE(&dquot->dq_hash); 797884d179dSJan Kara INIT_LIST_HEAD(&dquot->dq_dirty); 798884d179dSJan Kara init_waitqueue_head(&dquot->dq_wait_unused); 799884d179dSJan Kara dquot->dq_sb = sb; 800884d179dSJan Kara dquot->dq_type = type; 801884d179dSJan Kara atomic_set(&dquot->dq_count, 1); 802884d179dSJan Kara 803884d179dSJan Kara return dquot; 804884d179dSJan Kara } 805884d179dSJan Kara 806884d179dSJan Kara /* 807884d179dSJan Kara * Get reference to dquot 808884d179dSJan Kara * 809884d179dSJan Kara * Locking is slightly tricky here. We are guarded from parallel quotaoff() 810884d179dSJan Kara * destroying our dquot by: 811884d179dSJan Kara * a) checking for quota flags under dq_list_lock and 812884d179dSJan Kara * b) getting a reference to dquot before we release dq_list_lock 813884d179dSJan Kara */ 814884d179dSJan Kara struct dquot *dqget(struct super_block *sb, unsigned int id, int type) 815884d179dSJan Kara { 816884d179dSJan Kara unsigned int hashent = hashfn(sb, id, type); 817dd6f3c6dSJan Kara struct dquot *dquot = NULL, *empty = NULL; 818884d179dSJan Kara 819884d179dSJan Kara if (!sb_has_quota_active(sb, type)) 820dd6f3c6dSJan Kara return NULL; 821884d179dSJan Kara we_slept: 822884d179dSJan Kara spin_lock(&dq_list_lock); 823884d179dSJan Kara spin_lock(&dq_state_lock); 824884d179dSJan Kara if (!sb_has_quota_active(sb, type)) { 825884d179dSJan Kara spin_unlock(&dq_state_lock); 826884d179dSJan Kara spin_unlock(&dq_list_lock); 827884d179dSJan Kara goto out; 828884d179dSJan Kara } 829884d179dSJan Kara spin_unlock(&dq_state_lock); 830884d179dSJan Kara 831dd6f3c6dSJan Kara dquot = find_dquot(hashent, sb, id, type); 832dd6f3c6dSJan Kara if (!dquot) { 833dd6f3c6dSJan Kara if (!empty) { 834884d179dSJan Kara spin_unlock(&dq_list_lock); 835dd6f3c6dSJan Kara empty = get_empty_dquot(sb, type); 836dd6f3c6dSJan Kara if (!empty) 837884d179dSJan Kara schedule(); /* Try to wait for a moment... */ 838884d179dSJan Kara goto we_slept; 839884d179dSJan Kara } 840884d179dSJan Kara dquot = empty; 841dd6f3c6dSJan Kara empty = NULL; 842884d179dSJan Kara dquot->dq_id = id; 843884d179dSJan Kara /* all dquots go on the inuse_list */ 844884d179dSJan Kara put_inuse(dquot); 845884d179dSJan Kara /* hash it first so it can be found */ 846884d179dSJan Kara insert_dquot_hash(dquot); 847884d179dSJan Kara spin_unlock(&dq_list_lock); 848dde95888SDmitry Monakhov dqstats_inc(DQST_LOOKUPS); 849884d179dSJan Kara } else { 850884d179dSJan Kara if (!atomic_read(&dquot->dq_count)) 851884d179dSJan Kara remove_free_dquot(dquot); 852884d179dSJan Kara atomic_inc(&dquot->dq_count); 853884d179dSJan Kara spin_unlock(&dq_list_lock); 854dde95888SDmitry Monakhov dqstats_inc(DQST_CACHE_HITS); 855dde95888SDmitry Monakhov dqstats_inc(DQST_LOOKUPS); 856884d179dSJan Kara } 857268157baSJan Kara /* Wait for dq_lock - after this we know that either dquot_release() is 858268157baSJan Kara * already finished or it will be canceled due to dq_count > 1 test */ 859884d179dSJan Kara wait_on_dquot(dquot); 860268157baSJan Kara /* Read the dquot / allocate space in quota file */ 861268157baSJan Kara if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && 862268157baSJan Kara sb->dq_op->acquire_dquot(dquot) < 0) { 863884d179dSJan Kara dqput(dquot); 864dd6f3c6dSJan Kara dquot = NULL; 865884d179dSJan Kara goto out; 866884d179dSJan Kara } 86762af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 868884d179dSJan Kara BUG_ON(!dquot->dq_sb); /* Has somebody invalidated entry under us? */ 869884d179dSJan Kara #endif 870884d179dSJan Kara out: 871884d179dSJan Kara if (empty) 872884d179dSJan Kara do_destroy_dquot(empty); 873884d179dSJan Kara 874884d179dSJan Kara return dquot; 875884d179dSJan Kara } 876884d179dSJan Kara EXPORT_SYMBOL(dqget); 877884d179dSJan Kara 878884d179dSJan Kara static int dqinit_needed(struct inode *inode, int type) 879884d179dSJan Kara { 880884d179dSJan Kara int cnt; 881884d179dSJan Kara 882884d179dSJan Kara if (IS_NOQUOTA(inode)) 883884d179dSJan Kara return 0; 884884d179dSJan Kara if (type != -1) 885dd6f3c6dSJan Kara return !inode->i_dquot[type]; 886884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 887dd6f3c6dSJan Kara if (!inode->i_dquot[cnt]) 888884d179dSJan Kara return 1; 889884d179dSJan Kara return 0; 890884d179dSJan Kara } 891884d179dSJan Kara 892884d179dSJan Kara /* This routine is guarded by dqonoff_mutex mutex */ 893884d179dSJan Kara static void add_dquot_ref(struct super_block *sb, int type) 894884d179dSJan Kara { 895884d179dSJan Kara struct inode *inode, *old_inode = NULL; 89662af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 8970a5a9c72SJan Kara int reserved = 0; 8984c5e6c0eSJan Kara #endif 899884d179dSJan Kara 90055fa6091SDave Chinner spin_lock(&inode_sb_list_lock); 901884d179dSJan Kara list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { 902250df6edSDave Chinner spin_lock(&inode->i_lock); 903250df6edSDave Chinner if ((inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW)) || 904250df6edSDave Chinner !atomic_read(&inode->i_writecount) || 905250df6edSDave Chinner !dqinit_needed(inode, type)) { 906250df6edSDave Chinner spin_unlock(&inode->i_lock); 9073ae5080fSLinus Torvalds continue; 908250df6edSDave Chinner } 909884d179dSJan Kara __iget(inode); 910250df6edSDave Chinner spin_unlock(&inode->i_lock); 91155fa6091SDave Chinner spin_unlock(&inode_sb_list_lock); 912884d179dSJan Kara 913d7e97117SJan Kara #ifdef CONFIG_QUOTA_DEBUG 914d7e97117SJan Kara if (unlikely(inode_get_rsv_space(inode) > 0)) 915d7e97117SJan Kara reserved = 1; 916d7e97117SJan Kara #endif 917884d179dSJan Kara iput(old_inode); 918871a2931SChristoph Hellwig __dquot_initialize(inode, type); 91955fa6091SDave Chinner 92055fa6091SDave Chinner /* 92155fa6091SDave Chinner * We hold a reference to 'inode' so it couldn't have been 92255fa6091SDave Chinner * removed from s_inodes list while we dropped the 92355fa6091SDave Chinner * inode_sb_list_lock We cannot iput the inode now as we can be 92455fa6091SDave Chinner * holding the last reference and we cannot iput it under 92555fa6091SDave Chinner * inode_sb_list_lock. So we keep the reference and iput it 92655fa6091SDave Chinner * later. 92755fa6091SDave Chinner */ 928884d179dSJan Kara old_inode = inode; 92955fa6091SDave Chinner spin_lock(&inode_sb_list_lock); 930884d179dSJan Kara } 93155fa6091SDave Chinner spin_unlock(&inode_sb_list_lock); 932884d179dSJan Kara iput(old_inode); 9330a5a9c72SJan Kara 93462af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 9350a5a9c72SJan Kara if (reserved) { 936fb5ffb0eSJiaying Zhang quota_error(sb, "Writes happened before quota was turned on " 937fb5ffb0eSJiaying Zhang "thus quota information is probably inconsistent. " 938fb5ffb0eSJiaying Zhang "Please run quotacheck(8)"); 9390a5a9c72SJan Kara } 9404c5e6c0eSJan Kara #endif 941884d179dSJan Kara } 942884d179dSJan Kara 943268157baSJan Kara /* 944268157baSJan Kara * Return 0 if dqput() won't block. 945268157baSJan Kara * (note that 1 doesn't necessarily mean blocking) 946268157baSJan Kara */ 947884d179dSJan Kara static inline int dqput_blocks(struct dquot *dquot) 948884d179dSJan Kara { 949884d179dSJan Kara if (atomic_read(&dquot->dq_count) <= 1) 950884d179dSJan Kara return 1; 951884d179dSJan Kara return 0; 952884d179dSJan Kara } 953884d179dSJan Kara 954268157baSJan Kara /* 955268157baSJan Kara * Remove references to dquots from inode and add dquot to list for freeing 95625985edcSLucas De Marchi * if we have the last reference to dquot 957268157baSJan Kara * We can't race with anybody because we hold dqptr_sem for writing... 958268157baSJan Kara */ 959884d179dSJan Kara static int remove_inode_dquot_ref(struct inode *inode, int type, 960884d179dSJan Kara struct list_head *tofree_head) 961884d179dSJan Kara { 962884d179dSJan Kara struct dquot *dquot = inode->i_dquot[type]; 963884d179dSJan Kara 964dd6f3c6dSJan Kara inode->i_dquot[type] = NULL; 965dd6f3c6dSJan Kara if (dquot) { 966884d179dSJan Kara if (dqput_blocks(dquot)) { 96762af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 968884d179dSJan Kara if (atomic_read(&dquot->dq_count) != 1) 969fb5ffb0eSJiaying Zhang quota_error(inode->i_sb, "Adding dquot with " 970fb5ffb0eSJiaying Zhang "dq_count %d to dispose list", 971fb5ffb0eSJiaying Zhang atomic_read(&dquot->dq_count)); 972884d179dSJan Kara #endif 973884d179dSJan Kara spin_lock(&dq_list_lock); 974268157baSJan Kara /* As dquot must have currently users it can't be on 975268157baSJan Kara * the free list... */ 976268157baSJan Kara list_add(&dquot->dq_free, tofree_head); 977884d179dSJan Kara spin_unlock(&dq_list_lock); 978884d179dSJan Kara return 1; 979884d179dSJan Kara } 980884d179dSJan Kara else 981884d179dSJan Kara dqput(dquot); /* We have guaranteed we won't block */ 982884d179dSJan Kara } 983884d179dSJan Kara return 0; 984884d179dSJan Kara } 985884d179dSJan Kara 986268157baSJan Kara /* 987268157baSJan Kara * Free list of dquots 988268157baSJan Kara * Dquots are removed from inodes and no new references can be got so we are 989268157baSJan Kara * the only ones holding reference 990268157baSJan Kara */ 991884d179dSJan Kara static void put_dquot_list(struct list_head *tofree_head) 992884d179dSJan Kara { 993884d179dSJan Kara struct list_head *act_head; 994884d179dSJan Kara struct dquot *dquot; 995884d179dSJan Kara 996884d179dSJan Kara act_head = tofree_head->next; 997884d179dSJan Kara while (act_head != tofree_head) { 998884d179dSJan Kara dquot = list_entry(act_head, struct dquot, dq_free); 999884d179dSJan Kara act_head = act_head->next; 1000268157baSJan Kara /* Remove dquot from the list so we won't have problems... */ 1001268157baSJan Kara list_del_init(&dquot->dq_free); 1002884d179dSJan Kara dqput(dquot); 1003884d179dSJan Kara } 1004884d179dSJan Kara } 1005884d179dSJan Kara 1006884d179dSJan Kara static void remove_dquot_ref(struct super_block *sb, int type, 1007884d179dSJan Kara struct list_head *tofree_head) 1008884d179dSJan Kara { 1009884d179dSJan Kara struct inode *inode; 10107af9cce8SDmitry Monakhov int reserved = 0; 1011884d179dSJan Kara 101255fa6091SDave Chinner spin_lock(&inode_sb_list_lock); 1013884d179dSJan Kara list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { 10143ae5080fSLinus Torvalds /* 10153ae5080fSLinus Torvalds * We have to scan also I_NEW inodes because they can already 10163ae5080fSLinus Torvalds * have quota pointer initialized. Luckily, we need to touch 10173ae5080fSLinus Torvalds * only quota pointers and these have separate locking 10183ae5080fSLinus Torvalds * (dqptr_sem). 10193ae5080fSLinus Torvalds */ 10207af9cce8SDmitry Monakhov if (!IS_NOQUOTA(inode)) { 10217af9cce8SDmitry Monakhov if (unlikely(inode_get_rsv_space(inode) > 0)) 10227af9cce8SDmitry Monakhov reserved = 1; 1023884d179dSJan Kara remove_inode_dquot_ref(inode, type, tofree_head); 1024884d179dSJan Kara } 10257af9cce8SDmitry Monakhov } 102655fa6091SDave Chinner spin_unlock(&inode_sb_list_lock); 10277af9cce8SDmitry Monakhov #ifdef CONFIG_QUOTA_DEBUG 10287af9cce8SDmitry Monakhov if (reserved) { 10297af9cce8SDmitry Monakhov printk(KERN_WARNING "VFS (%s): Writes happened after quota" 10307af9cce8SDmitry Monakhov " was disabled thus quota information is probably " 10317af9cce8SDmitry Monakhov "inconsistent. Please run quotacheck(8).\n", sb->s_id); 10327af9cce8SDmitry Monakhov } 10337af9cce8SDmitry Monakhov #endif 1034884d179dSJan Kara } 1035884d179dSJan Kara 1036884d179dSJan Kara /* Gather all references from inodes and drop them */ 1037884d179dSJan Kara static void drop_dquot_ref(struct super_block *sb, int type) 1038884d179dSJan Kara { 1039884d179dSJan Kara LIST_HEAD(tofree_head); 1040884d179dSJan Kara 1041884d179dSJan Kara if (sb->dq_op) { 1042884d179dSJan Kara down_write(&sb_dqopt(sb)->dqptr_sem); 1043884d179dSJan Kara remove_dquot_ref(sb, type, &tofree_head); 1044884d179dSJan Kara up_write(&sb_dqopt(sb)->dqptr_sem); 1045884d179dSJan Kara put_dquot_list(&tofree_head); 1046884d179dSJan Kara } 1047884d179dSJan Kara } 1048884d179dSJan Kara 1049884d179dSJan Kara static inline void dquot_incr_inodes(struct dquot *dquot, qsize_t number) 1050884d179dSJan Kara { 1051884d179dSJan Kara dquot->dq_dqb.dqb_curinodes += number; 1052884d179dSJan Kara } 1053884d179dSJan Kara 1054884d179dSJan Kara static inline void dquot_incr_space(struct dquot *dquot, qsize_t number) 1055884d179dSJan Kara { 1056884d179dSJan Kara dquot->dq_dqb.dqb_curspace += number; 1057884d179dSJan Kara } 1058884d179dSJan Kara 1059884d179dSJan Kara static inline void dquot_resv_space(struct dquot *dquot, qsize_t number) 1060884d179dSJan Kara { 1061884d179dSJan Kara dquot->dq_dqb.dqb_rsvspace += number; 1062884d179dSJan Kara } 1063884d179dSJan Kara 1064884d179dSJan Kara /* 1065884d179dSJan Kara * Claim reserved quota space 1066884d179dSJan Kara */ 10670a5a9c72SJan Kara static void dquot_claim_reserved_space(struct dquot *dquot, qsize_t number) 1068884d179dSJan Kara { 10690a5a9c72SJan Kara if (dquot->dq_dqb.dqb_rsvspace < number) { 10700a5a9c72SJan Kara WARN_ON_ONCE(1); 10710a5a9c72SJan Kara number = dquot->dq_dqb.dqb_rsvspace; 10720a5a9c72SJan Kara } 1073884d179dSJan Kara dquot->dq_dqb.dqb_curspace += number; 1074884d179dSJan Kara dquot->dq_dqb.dqb_rsvspace -= number; 1075884d179dSJan Kara } 1076884d179dSJan Kara 1077884d179dSJan Kara static inline 1078884d179dSJan Kara void dquot_free_reserved_space(struct dquot *dquot, qsize_t number) 1079884d179dSJan Kara { 10800a5a9c72SJan Kara if (dquot->dq_dqb.dqb_rsvspace >= number) 1081884d179dSJan Kara dquot->dq_dqb.dqb_rsvspace -= number; 10820a5a9c72SJan Kara else { 10830a5a9c72SJan Kara WARN_ON_ONCE(1); 10840a5a9c72SJan Kara dquot->dq_dqb.dqb_rsvspace = 0; 10850a5a9c72SJan Kara } 1086884d179dSJan Kara } 1087884d179dSJan Kara 10887a2435d8SJan Kara static void dquot_decr_inodes(struct dquot *dquot, qsize_t number) 1089884d179dSJan Kara { 1090884d179dSJan Kara if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE || 1091884d179dSJan Kara dquot->dq_dqb.dqb_curinodes >= number) 1092884d179dSJan Kara dquot->dq_dqb.dqb_curinodes -= number; 1093884d179dSJan Kara else 1094884d179dSJan Kara dquot->dq_dqb.dqb_curinodes = 0; 1095884d179dSJan Kara if (dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit) 1096884d179dSJan Kara dquot->dq_dqb.dqb_itime = (time_t) 0; 1097884d179dSJan Kara clear_bit(DQ_INODES_B, &dquot->dq_flags); 1098884d179dSJan Kara } 1099884d179dSJan Kara 11007a2435d8SJan Kara static void dquot_decr_space(struct dquot *dquot, qsize_t number) 1101884d179dSJan Kara { 1102884d179dSJan Kara if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE || 1103884d179dSJan Kara dquot->dq_dqb.dqb_curspace >= number) 1104884d179dSJan Kara dquot->dq_dqb.dqb_curspace -= number; 1105884d179dSJan Kara else 1106884d179dSJan Kara dquot->dq_dqb.dqb_curspace = 0; 1107884d179dSJan Kara if (dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit) 1108884d179dSJan Kara dquot->dq_dqb.dqb_btime = (time_t) 0; 1109884d179dSJan Kara clear_bit(DQ_BLKS_B, &dquot->dq_flags); 1110884d179dSJan Kara } 1111884d179dSJan Kara 1112bf097aafSJan Kara struct dquot_warn { 1113bf097aafSJan Kara struct super_block *w_sb; 1114bf097aafSJan Kara qid_t w_dq_id; 1115bf097aafSJan Kara short w_dq_type; 1116bf097aafSJan Kara short w_type; 1117bf097aafSJan Kara }; 1118bf097aafSJan Kara 1119884d179dSJan Kara static int warning_issued(struct dquot *dquot, const int warntype) 1120884d179dSJan Kara { 1121884d179dSJan Kara int flag = (warntype == QUOTA_NL_BHARDWARN || 1122884d179dSJan Kara warntype == QUOTA_NL_BSOFTLONGWARN) ? DQ_BLKS_B : 1123884d179dSJan Kara ((warntype == QUOTA_NL_IHARDWARN || 1124884d179dSJan Kara warntype == QUOTA_NL_ISOFTLONGWARN) ? DQ_INODES_B : 0); 1125884d179dSJan Kara 1126884d179dSJan Kara if (!flag) 1127884d179dSJan Kara return 0; 1128884d179dSJan Kara return test_and_set_bit(flag, &dquot->dq_flags); 1129884d179dSJan Kara } 1130884d179dSJan Kara 1131884d179dSJan Kara #ifdef CONFIG_PRINT_QUOTA_WARNING 1132884d179dSJan Kara static int flag_print_warnings = 1; 1133884d179dSJan Kara 1134bf097aafSJan Kara static int need_print_warning(struct dquot_warn *warn) 1135884d179dSJan Kara { 1136884d179dSJan Kara if (!flag_print_warnings) 1137884d179dSJan Kara return 0; 1138884d179dSJan Kara 1139bf097aafSJan Kara switch (warn->w_dq_type) { 1140884d179dSJan Kara case USRQUOTA: 1141bf097aafSJan Kara return current_fsuid() == warn->w_dq_id; 1142884d179dSJan Kara case GRPQUOTA: 1143bf097aafSJan Kara return in_group_p(warn->w_dq_id); 1144884d179dSJan Kara } 1145884d179dSJan Kara return 0; 1146884d179dSJan Kara } 1147884d179dSJan Kara 1148884d179dSJan Kara /* Print warning to user which exceeded quota */ 1149bf097aafSJan Kara static void print_warning(struct dquot_warn *warn) 1150884d179dSJan Kara { 1151884d179dSJan Kara char *msg = NULL; 1152884d179dSJan Kara struct tty_struct *tty; 1153bf097aafSJan Kara int warntype = warn->w_type; 1154884d179dSJan Kara 1155884d179dSJan Kara if (warntype == QUOTA_NL_IHARDBELOW || 1156884d179dSJan Kara warntype == QUOTA_NL_ISOFTBELOW || 1157884d179dSJan Kara warntype == QUOTA_NL_BHARDBELOW || 1158bf097aafSJan Kara warntype == QUOTA_NL_BSOFTBELOW || !need_print_warning(warn)) 1159884d179dSJan Kara return; 1160884d179dSJan Kara 1161884d179dSJan Kara tty = get_current_tty(); 1162884d179dSJan Kara if (!tty) 1163884d179dSJan Kara return; 1164bf097aafSJan Kara tty_write_message(tty, warn->w_sb->s_id); 1165884d179dSJan Kara if (warntype == QUOTA_NL_ISOFTWARN || warntype == QUOTA_NL_BSOFTWARN) 1166884d179dSJan Kara tty_write_message(tty, ": warning, "); 1167884d179dSJan Kara else 1168884d179dSJan Kara tty_write_message(tty, ": write failed, "); 1169bf097aafSJan Kara tty_write_message(tty, quotatypes[warn->w_dq_type]); 1170884d179dSJan Kara switch (warntype) { 1171884d179dSJan Kara case QUOTA_NL_IHARDWARN: 1172884d179dSJan Kara msg = " file limit reached.\r\n"; 1173884d179dSJan Kara break; 1174884d179dSJan Kara case QUOTA_NL_ISOFTLONGWARN: 1175884d179dSJan Kara msg = " file quota exceeded too long.\r\n"; 1176884d179dSJan Kara break; 1177884d179dSJan Kara case QUOTA_NL_ISOFTWARN: 1178884d179dSJan Kara msg = " file quota exceeded.\r\n"; 1179884d179dSJan Kara break; 1180884d179dSJan Kara case QUOTA_NL_BHARDWARN: 1181884d179dSJan Kara msg = " block limit reached.\r\n"; 1182884d179dSJan Kara break; 1183884d179dSJan Kara case QUOTA_NL_BSOFTLONGWARN: 1184884d179dSJan Kara msg = " block quota exceeded too long.\r\n"; 1185884d179dSJan Kara break; 1186884d179dSJan Kara case QUOTA_NL_BSOFTWARN: 1187884d179dSJan Kara msg = " block quota exceeded.\r\n"; 1188884d179dSJan Kara break; 1189884d179dSJan Kara } 1190884d179dSJan Kara tty_write_message(tty, msg); 1191884d179dSJan Kara tty_kref_put(tty); 1192884d179dSJan Kara } 1193884d179dSJan Kara #endif 1194884d179dSJan Kara 1195bf097aafSJan Kara static void prepare_warning(struct dquot_warn *warn, struct dquot *dquot, 1196bf097aafSJan Kara int warntype) 1197bf097aafSJan Kara { 1198bf097aafSJan Kara if (warning_issued(dquot, warntype)) 1199bf097aafSJan Kara return; 1200bf097aafSJan Kara warn->w_type = warntype; 1201bf097aafSJan Kara warn->w_sb = dquot->dq_sb; 1202bf097aafSJan Kara warn->w_dq_id = dquot->dq_id; 1203bf097aafSJan Kara warn->w_dq_type = dquot->dq_type; 1204bf097aafSJan Kara } 1205bf097aafSJan Kara 1206884d179dSJan Kara /* 1207884d179dSJan Kara * Write warnings to the console and send warning messages over netlink. 1208884d179dSJan Kara * 1209bf097aafSJan Kara * Note that this function can call into tty and networking code. 1210884d179dSJan Kara */ 1211bf097aafSJan Kara static void flush_warnings(struct dquot_warn *warn) 1212884d179dSJan Kara { 1213884d179dSJan Kara int i; 1214884d179dSJan Kara 121586e931a3SSteven Whitehouse for (i = 0; i < MAXQUOTAS; i++) { 1216bf097aafSJan Kara if (warn[i].w_type == QUOTA_NL_NOWARN) 1217bf097aafSJan Kara continue; 1218884d179dSJan Kara #ifdef CONFIG_PRINT_QUOTA_WARNING 1219bf097aafSJan Kara print_warning(&warn[i]); 1220884d179dSJan Kara #endif 1221bf097aafSJan Kara quota_send_warning(warn[i].w_dq_type, warn[i].w_dq_id, 1222bf097aafSJan Kara warn[i].w_sb->s_dev, warn[i].w_type); 1223884d179dSJan Kara } 1224884d179dSJan Kara } 1225884d179dSJan Kara 12267a2435d8SJan Kara static int ignore_hardlimit(struct dquot *dquot) 1227884d179dSJan Kara { 1228884d179dSJan Kara struct mem_dqinfo *info = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_type]; 1229884d179dSJan Kara 1230884d179dSJan Kara return capable(CAP_SYS_RESOURCE) && 1231268157baSJan Kara (info->dqi_format->qf_fmt_id != QFMT_VFS_OLD || 1232268157baSJan Kara !(info->dqi_flags & V1_DQF_RSQUASH)); 1233884d179dSJan Kara } 1234884d179dSJan Kara 1235884d179dSJan Kara /* needs dq_data_lock */ 1236bf097aafSJan Kara static int check_idq(struct dquot *dquot, qsize_t inodes, 1237bf097aafSJan Kara struct dquot_warn *warn) 1238884d179dSJan Kara { 1239268157baSJan Kara qsize_t newinodes = dquot->dq_dqb.dqb_curinodes + inodes; 1240268157baSJan Kara 1241884d179dSJan Kara if (!sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_type) || 1242884d179dSJan Kara test_bit(DQ_FAKE_B, &dquot->dq_flags)) 1243efd8f0e6SChristoph Hellwig return 0; 1244884d179dSJan Kara 1245884d179dSJan Kara if (dquot->dq_dqb.dqb_ihardlimit && 1246268157baSJan Kara newinodes > dquot->dq_dqb.dqb_ihardlimit && 1247884d179dSJan Kara !ignore_hardlimit(dquot)) { 1248bf097aafSJan Kara prepare_warning(warn, dquot, QUOTA_NL_IHARDWARN); 1249efd8f0e6SChristoph Hellwig return -EDQUOT; 1250884d179dSJan Kara } 1251884d179dSJan Kara 1252884d179dSJan Kara if (dquot->dq_dqb.dqb_isoftlimit && 1253268157baSJan Kara newinodes > dquot->dq_dqb.dqb_isoftlimit && 1254268157baSJan Kara dquot->dq_dqb.dqb_itime && 1255268157baSJan Kara get_seconds() >= dquot->dq_dqb.dqb_itime && 1256884d179dSJan Kara !ignore_hardlimit(dquot)) { 1257bf097aafSJan Kara prepare_warning(warn, dquot, QUOTA_NL_ISOFTLONGWARN); 1258efd8f0e6SChristoph Hellwig return -EDQUOT; 1259884d179dSJan Kara } 1260884d179dSJan Kara 1261884d179dSJan Kara if (dquot->dq_dqb.dqb_isoftlimit && 1262268157baSJan Kara newinodes > dquot->dq_dqb.dqb_isoftlimit && 1263884d179dSJan Kara dquot->dq_dqb.dqb_itime == 0) { 1264bf097aafSJan Kara prepare_warning(warn, dquot, QUOTA_NL_ISOFTWARN); 1265268157baSJan Kara dquot->dq_dqb.dqb_itime = get_seconds() + 1266268157baSJan Kara sb_dqopt(dquot->dq_sb)->info[dquot->dq_type].dqi_igrace; 1267884d179dSJan Kara } 1268884d179dSJan Kara 1269efd8f0e6SChristoph Hellwig return 0; 1270884d179dSJan Kara } 1271884d179dSJan Kara 1272884d179dSJan Kara /* needs dq_data_lock */ 1273bf097aafSJan Kara static int check_bdq(struct dquot *dquot, qsize_t space, int prealloc, 1274bf097aafSJan Kara struct dquot_warn *warn) 1275884d179dSJan Kara { 1276884d179dSJan Kara qsize_t tspace; 1277268157baSJan Kara struct super_block *sb = dquot->dq_sb; 1278884d179dSJan Kara 1279268157baSJan Kara if (!sb_has_quota_limits_enabled(sb, dquot->dq_type) || 1280884d179dSJan Kara test_bit(DQ_FAKE_B, &dquot->dq_flags)) 1281efd8f0e6SChristoph Hellwig return 0; 1282884d179dSJan Kara 1283884d179dSJan Kara tspace = dquot->dq_dqb.dqb_curspace + dquot->dq_dqb.dqb_rsvspace 1284884d179dSJan Kara + space; 1285884d179dSJan Kara 1286884d179dSJan Kara if (dquot->dq_dqb.dqb_bhardlimit && 1287884d179dSJan Kara tspace > dquot->dq_dqb.dqb_bhardlimit && 1288884d179dSJan Kara !ignore_hardlimit(dquot)) { 1289884d179dSJan Kara if (!prealloc) 1290bf097aafSJan Kara prepare_warning(warn, dquot, QUOTA_NL_BHARDWARN); 1291efd8f0e6SChristoph Hellwig return -EDQUOT; 1292884d179dSJan Kara } 1293884d179dSJan Kara 1294884d179dSJan Kara if (dquot->dq_dqb.dqb_bsoftlimit && 1295884d179dSJan Kara tspace > dquot->dq_dqb.dqb_bsoftlimit && 1296268157baSJan Kara dquot->dq_dqb.dqb_btime && 1297268157baSJan Kara get_seconds() >= dquot->dq_dqb.dqb_btime && 1298884d179dSJan Kara !ignore_hardlimit(dquot)) { 1299884d179dSJan Kara if (!prealloc) 1300bf097aafSJan Kara prepare_warning(warn, dquot, QUOTA_NL_BSOFTLONGWARN); 1301efd8f0e6SChristoph Hellwig return -EDQUOT; 1302884d179dSJan Kara } 1303884d179dSJan Kara 1304884d179dSJan Kara if (dquot->dq_dqb.dqb_bsoftlimit && 1305884d179dSJan Kara tspace > dquot->dq_dqb.dqb_bsoftlimit && 1306884d179dSJan Kara dquot->dq_dqb.dqb_btime == 0) { 1307884d179dSJan Kara if (!prealloc) { 1308bf097aafSJan Kara prepare_warning(warn, dquot, QUOTA_NL_BSOFTWARN); 1309268157baSJan Kara dquot->dq_dqb.dqb_btime = get_seconds() + 1310268157baSJan Kara sb_dqopt(sb)->info[dquot->dq_type].dqi_bgrace; 1311884d179dSJan Kara } 1312884d179dSJan Kara else 1313884d179dSJan Kara /* 1314884d179dSJan Kara * We don't allow preallocation to exceed softlimit so exceeding will 1315884d179dSJan Kara * be always printed 1316884d179dSJan Kara */ 1317efd8f0e6SChristoph Hellwig return -EDQUOT; 1318884d179dSJan Kara } 1319884d179dSJan Kara 1320efd8f0e6SChristoph Hellwig return 0; 1321884d179dSJan Kara } 1322884d179dSJan Kara 1323884d179dSJan Kara static int info_idq_free(struct dquot *dquot, qsize_t inodes) 1324884d179dSJan Kara { 1325268157baSJan Kara qsize_t newinodes; 1326268157baSJan Kara 1327884d179dSJan Kara if (test_bit(DQ_FAKE_B, &dquot->dq_flags) || 1328884d179dSJan Kara dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit || 1329884d179dSJan Kara !sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_type)) 1330884d179dSJan Kara return QUOTA_NL_NOWARN; 1331884d179dSJan Kara 1332268157baSJan Kara newinodes = dquot->dq_dqb.dqb_curinodes - inodes; 1333268157baSJan Kara if (newinodes <= dquot->dq_dqb.dqb_isoftlimit) 1334884d179dSJan Kara return QUOTA_NL_ISOFTBELOW; 1335884d179dSJan Kara if (dquot->dq_dqb.dqb_curinodes >= dquot->dq_dqb.dqb_ihardlimit && 1336268157baSJan Kara newinodes < dquot->dq_dqb.dqb_ihardlimit) 1337884d179dSJan Kara return QUOTA_NL_IHARDBELOW; 1338884d179dSJan Kara return QUOTA_NL_NOWARN; 1339884d179dSJan Kara } 1340884d179dSJan Kara 1341884d179dSJan Kara static int info_bdq_free(struct dquot *dquot, qsize_t space) 1342884d179dSJan Kara { 1343884d179dSJan Kara if (test_bit(DQ_FAKE_B, &dquot->dq_flags) || 1344884d179dSJan Kara dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit) 1345884d179dSJan Kara return QUOTA_NL_NOWARN; 1346884d179dSJan Kara 1347884d179dSJan Kara if (dquot->dq_dqb.dqb_curspace - space <= dquot->dq_dqb.dqb_bsoftlimit) 1348884d179dSJan Kara return QUOTA_NL_BSOFTBELOW; 1349884d179dSJan Kara if (dquot->dq_dqb.dqb_curspace >= dquot->dq_dqb.dqb_bhardlimit && 1350884d179dSJan Kara dquot->dq_dqb.dqb_curspace - space < dquot->dq_dqb.dqb_bhardlimit) 1351884d179dSJan Kara return QUOTA_NL_BHARDBELOW; 1352884d179dSJan Kara return QUOTA_NL_NOWARN; 1353884d179dSJan Kara } 13540a5a9c72SJan Kara 1355189eef59SChristoph Hellwig static int dquot_active(const struct inode *inode) 1356189eef59SChristoph Hellwig { 1357189eef59SChristoph Hellwig struct super_block *sb = inode->i_sb; 1358189eef59SChristoph Hellwig 1359189eef59SChristoph Hellwig if (IS_NOQUOTA(inode)) 1360189eef59SChristoph Hellwig return 0; 1361189eef59SChristoph Hellwig return sb_any_quota_loaded(sb) & ~sb_any_quota_suspended(sb); 1362189eef59SChristoph Hellwig } 1363189eef59SChristoph Hellwig 1364884d179dSJan Kara /* 1365884d179dSJan Kara * Initialize quota pointers in inode 1366871a2931SChristoph Hellwig * 1367884d179dSJan Kara * We do things in a bit complicated way but by that we avoid calling 1368884d179dSJan Kara * dqget() and thus filesystem callbacks under dqptr_sem. 1369871a2931SChristoph Hellwig * 1370871a2931SChristoph Hellwig * It is better to call this function outside of any transaction as it 1371871a2931SChristoph Hellwig * might need a lot of space in journal for dquot structure allocation. 1372884d179dSJan Kara */ 1373871a2931SChristoph Hellwig static void __dquot_initialize(struct inode *inode, int type) 1374884d179dSJan Kara { 1375884d179dSJan Kara unsigned int id = 0; 1376871a2931SChristoph Hellwig int cnt; 1377ad1e6e8dSDmitry Monakhov struct dquot *got[MAXQUOTAS]; 1378884d179dSJan Kara struct super_block *sb = inode->i_sb; 13790a5a9c72SJan Kara qsize_t rsv; 1380884d179dSJan Kara 1381884d179dSJan Kara /* First test before acquiring mutex - solves deadlocks when we 1382884d179dSJan Kara * re-enter the quota code and are already holding the mutex */ 1383189eef59SChristoph Hellwig if (!dquot_active(inode)) 1384871a2931SChristoph Hellwig return; 1385884d179dSJan Kara 1386884d179dSJan Kara /* First get references to structures we might need. */ 1387884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1388ad1e6e8dSDmitry Monakhov got[cnt] = NULL; 1389884d179dSJan Kara if (type != -1 && cnt != type) 1390884d179dSJan Kara continue; 1391884d179dSJan Kara switch (cnt) { 1392884d179dSJan Kara case USRQUOTA: 1393884d179dSJan Kara id = inode->i_uid; 1394884d179dSJan Kara break; 1395884d179dSJan Kara case GRPQUOTA: 1396884d179dSJan Kara id = inode->i_gid; 1397884d179dSJan Kara break; 1398884d179dSJan Kara } 1399884d179dSJan Kara got[cnt] = dqget(sb, id, cnt); 1400884d179dSJan Kara } 1401884d179dSJan Kara 1402884d179dSJan Kara down_write(&sb_dqopt(sb)->dqptr_sem); 1403884d179dSJan Kara if (IS_NOQUOTA(inode)) 1404884d179dSJan Kara goto out_err; 1405884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1406884d179dSJan Kara if (type != -1 && cnt != type) 1407884d179dSJan Kara continue; 1408884d179dSJan Kara /* Avoid races with quotaoff() */ 1409884d179dSJan Kara if (!sb_has_quota_active(sb, cnt)) 1410884d179dSJan Kara continue; 14114408ea41SJan Kara /* We could race with quotaon or dqget() could have failed */ 14124408ea41SJan Kara if (!got[cnt]) 14134408ea41SJan Kara continue; 1414dd6f3c6dSJan Kara if (!inode->i_dquot[cnt]) { 1415884d179dSJan Kara inode->i_dquot[cnt] = got[cnt]; 1416dd6f3c6dSJan Kara got[cnt] = NULL; 14170a5a9c72SJan Kara /* 14180a5a9c72SJan Kara * Make quota reservation system happy if someone 14190a5a9c72SJan Kara * did a write before quota was turned on 14200a5a9c72SJan Kara */ 14210a5a9c72SJan Kara rsv = inode_get_rsv_space(inode); 14220a5a9c72SJan Kara if (unlikely(rsv)) 14230a5a9c72SJan Kara dquot_resv_space(inode->i_dquot[cnt], rsv); 1424884d179dSJan Kara } 1425884d179dSJan Kara } 1426884d179dSJan Kara out_err: 1427884d179dSJan Kara up_write(&sb_dqopt(sb)->dqptr_sem); 1428884d179dSJan Kara /* Drop unused references */ 1429dc52dd3aSDmitry Monakhov dqput_all(got); 1430871a2931SChristoph Hellwig } 1431871a2931SChristoph Hellwig 1432871a2931SChristoph Hellwig void dquot_initialize(struct inode *inode) 1433871a2931SChristoph Hellwig { 1434871a2931SChristoph Hellwig __dquot_initialize(inode, -1); 1435884d179dSJan Kara } 1436884d179dSJan Kara EXPORT_SYMBOL(dquot_initialize); 1437884d179dSJan Kara 1438884d179dSJan Kara /* 1439884d179dSJan Kara * Release all quotas referenced by inode 1440884d179dSJan Kara */ 14419f754758SChristoph Hellwig static void __dquot_drop(struct inode *inode) 1442884d179dSJan Kara { 1443884d179dSJan Kara int cnt; 1444884d179dSJan Kara struct dquot *put[MAXQUOTAS]; 1445884d179dSJan Kara 1446884d179dSJan Kara down_write(&sb_dqopt(inode->i_sb)->dqptr_sem); 1447884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1448884d179dSJan Kara put[cnt] = inode->i_dquot[cnt]; 1449dd6f3c6dSJan Kara inode->i_dquot[cnt] = NULL; 1450884d179dSJan Kara } 1451884d179dSJan Kara up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); 1452dc52dd3aSDmitry Monakhov dqput_all(put); 1453884d179dSJan Kara } 1454884d179dSJan Kara 14559f754758SChristoph Hellwig void dquot_drop(struct inode *inode) 1456884d179dSJan Kara { 1457884d179dSJan Kara int cnt; 14589f754758SChristoph Hellwig 14599f754758SChristoph Hellwig if (IS_NOQUOTA(inode)) 14609f754758SChristoph Hellwig return; 14619f754758SChristoph Hellwig 14629f754758SChristoph Hellwig /* 14639f754758SChristoph Hellwig * Test before calling to rule out calls from proc and such 1464884d179dSJan Kara * where we are not allowed to block. Note that this is 1465884d179dSJan Kara * actually reliable test even without the lock - the caller 1466884d179dSJan Kara * must assure that nobody can come after the DQUOT_DROP and 14679f754758SChristoph Hellwig * add quota pointers back anyway. 14689f754758SChristoph Hellwig */ 14699f754758SChristoph Hellwig for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1470dd6f3c6dSJan Kara if (inode->i_dquot[cnt]) 1471884d179dSJan Kara break; 14729f754758SChristoph Hellwig } 14739f754758SChristoph Hellwig 1474884d179dSJan Kara if (cnt < MAXQUOTAS) 14759f754758SChristoph Hellwig __dquot_drop(inode); 1476884d179dSJan Kara } 14779f754758SChristoph Hellwig EXPORT_SYMBOL(dquot_drop); 1478884d179dSJan Kara 1479884d179dSJan Kara /* 1480fd8fbfc1SDmitry Monakhov * inode_reserved_space is managed internally by quota, and protected by 1481fd8fbfc1SDmitry Monakhov * i_lock similar to i_blocks+i_bytes. 1482fd8fbfc1SDmitry Monakhov */ 1483fd8fbfc1SDmitry Monakhov static qsize_t *inode_reserved_space(struct inode * inode) 1484fd8fbfc1SDmitry Monakhov { 1485fd8fbfc1SDmitry Monakhov /* Filesystem must explicitly define it's own method in order to use 1486fd8fbfc1SDmitry Monakhov * quota reservation interface */ 1487fd8fbfc1SDmitry Monakhov BUG_ON(!inode->i_sb->dq_op->get_reserved_space); 1488fd8fbfc1SDmitry Monakhov return inode->i_sb->dq_op->get_reserved_space(inode); 1489fd8fbfc1SDmitry Monakhov } 1490fd8fbfc1SDmitry Monakhov 1491c469070aSDmitry Monakhov void inode_add_rsv_space(struct inode *inode, qsize_t number) 1492fd8fbfc1SDmitry Monakhov { 1493fd8fbfc1SDmitry Monakhov spin_lock(&inode->i_lock); 1494fd8fbfc1SDmitry Monakhov *inode_reserved_space(inode) += number; 1495fd8fbfc1SDmitry Monakhov spin_unlock(&inode->i_lock); 1496fd8fbfc1SDmitry Monakhov } 1497c469070aSDmitry Monakhov EXPORT_SYMBOL(inode_add_rsv_space); 1498fd8fbfc1SDmitry Monakhov 1499c469070aSDmitry Monakhov void inode_claim_rsv_space(struct inode *inode, qsize_t number) 1500fd8fbfc1SDmitry Monakhov { 1501fd8fbfc1SDmitry Monakhov spin_lock(&inode->i_lock); 1502fd8fbfc1SDmitry Monakhov *inode_reserved_space(inode) -= number; 1503fd8fbfc1SDmitry Monakhov __inode_add_bytes(inode, number); 1504fd8fbfc1SDmitry Monakhov spin_unlock(&inode->i_lock); 1505fd8fbfc1SDmitry Monakhov } 1506c469070aSDmitry Monakhov EXPORT_SYMBOL(inode_claim_rsv_space); 1507fd8fbfc1SDmitry Monakhov 1508c469070aSDmitry Monakhov void inode_sub_rsv_space(struct inode *inode, qsize_t number) 1509fd8fbfc1SDmitry Monakhov { 1510fd8fbfc1SDmitry Monakhov spin_lock(&inode->i_lock); 1511fd8fbfc1SDmitry Monakhov *inode_reserved_space(inode) -= number; 1512fd8fbfc1SDmitry Monakhov spin_unlock(&inode->i_lock); 1513fd8fbfc1SDmitry Monakhov } 1514c469070aSDmitry Monakhov EXPORT_SYMBOL(inode_sub_rsv_space); 1515fd8fbfc1SDmitry Monakhov 1516fd8fbfc1SDmitry Monakhov static qsize_t inode_get_rsv_space(struct inode *inode) 1517fd8fbfc1SDmitry Monakhov { 1518fd8fbfc1SDmitry Monakhov qsize_t ret; 151905b5d898SJan Kara 152005b5d898SJan Kara if (!inode->i_sb->dq_op->get_reserved_space) 152105b5d898SJan Kara return 0; 1522fd8fbfc1SDmitry Monakhov spin_lock(&inode->i_lock); 1523fd8fbfc1SDmitry Monakhov ret = *inode_reserved_space(inode); 1524fd8fbfc1SDmitry Monakhov spin_unlock(&inode->i_lock); 1525fd8fbfc1SDmitry Monakhov return ret; 1526fd8fbfc1SDmitry Monakhov } 1527fd8fbfc1SDmitry Monakhov 1528fd8fbfc1SDmitry Monakhov static void inode_incr_space(struct inode *inode, qsize_t number, 1529fd8fbfc1SDmitry Monakhov int reserve) 1530fd8fbfc1SDmitry Monakhov { 1531fd8fbfc1SDmitry Monakhov if (reserve) 1532fd8fbfc1SDmitry Monakhov inode_add_rsv_space(inode, number); 1533fd8fbfc1SDmitry Monakhov else 1534fd8fbfc1SDmitry Monakhov inode_add_bytes(inode, number); 1535fd8fbfc1SDmitry Monakhov } 1536fd8fbfc1SDmitry Monakhov 1537fd8fbfc1SDmitry Monakhov static void inode_decr_space(struct inode *inode, qsize_t number, int reserve) 1538fd8fbfc1SDmitry Monakhov { 1539fd8fbfc1SDmitry Monakhov if (reserve) 1540fd8fbfc1SDmitry Monakhov inode_sub_rsv_space(inode, number); 1541fd8fbfc1SDmitry Monakhov else 1542fd8fbfc1SDmitry Monakhov inode_sub_bytes(inode, number); 1543fd8fbfc1SDmitry Monakhov } 1544fd8fbfc1SDmitry Monakhov 1545fd8fbfc1SDmitry Monakhov /* 15465dd4056dSChristoph Hellwig * This functions updates i_blocks+i_bytes fields and quota information 15475dd4056dSChristoph Hellwig * (together with appropriate checks). 15485dd4056dSChristoph Hellwig * 15495dd4056dSChristoph Hellwig * NOTE: We absolutely rely on the fact that caller dirties the inode 15505dd4056dSChristoph Hellwig * (usually helpers in quotaops.h care about this) and holds a handle for 15515dd4056dSChristoph Hellwig * the current transaction so that dquot write and inode write go into the 15525dd4056dSChristoph Hellwig * same transaction. 1553884d179dSJan Kara */ 1554884d179dSJan Kara 1555884d179dSJan Kara /* 1556884d179dSJan Kara * This operation can block, but only after everything is updated 1557884d179dSJan Kara */ 155856246f9aSEric Sandeen int __dquot_alloc_space(struct inode *inode, qsize_t number, int flags) 1559884d179dSJan Kara { 15605dd4056dSChristoph Hellwig int cnt, ret = 0; 1561bf097aafSJan Kara struct dquot_warn warn[MAXQUOTAS]; 1562bf097aafSJan Kara struct dquot **dquots = inode->i_dquot; 156356246f9aSEric Sandeen int reserve = flags & DQUOT_SPACE_RESERVE; 1564884d179dSJan Kara 1565fd8fbfc1SDmitry Monakhov /* 1566fd8fbfc1SDmitry Monakhov * First test before acquiring mutex - solves deadlocks when we 1567fd8fbfc1SDmitry Monakhov * re-enter the quota code and are already holding the mutex 1568fd8fbfc1SDmitry Monakhov */ 1569189eef59SChristoph Hellwig if (!dquot_active(inode)) { 1570fd8fbfc1SDmitry Monakhov inode_incr_space(inode, number, reserve); 1571fd8fbfc1SDmitry Monakhov goto out; 1572fd8fbfc1SDmitry Monakhov } 1573fd8fbfc1SDmitry Monakhov 1574fd8fbfc1SDmitry Monakhov down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1575884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 1576bf097aafSJan Kara warn[cnt].w_type = QUOTA_NL_NOWARN; 1577884d179dSJan Kara 1578884d179dSJan Kara spin_lock(&dq_data_lock); 1579884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1580bf097aafSJan Kara if (!dquots[cnt]) 1581884d179dSJan Kara continue; 1582bf097aafSJan Kara ret = check_bdq(dquots[cnt], number, 1583bf097aafSJan Kara !(flags & DQUOT_SPACE_WARN), &warn[cnt]); 1584bf097aafSJan Kara if (ret && !(flags & DQUOT_SPACE_NOFAIL)) { 1585fd8fbfc1SDmitry Monakhov spin_unlock(&dq_data_lock); 1586fd8fbfc1SDmitry Monakhov goto out_flush_warn; 1587884d179dSJan Kara } 1588884d179dSJan Kara } 1589884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1590bf097aafSJan Kara if (!dquots[cnt]) 1591884d179dSJan Kara continue; 1592884d179dSJan Kara if (reserve) 1593bf097aafSJan Kara dquot_resv_space(dquots[cnt], number); 1594884d179dSJan Kara else 1595bf097aafSJan Kara dquot_incr_space(dquots[cnt], number); 1596884d179dSJan Kara } 1597fd8fbfc1SDmitry Monakhov inode_incr_space(inode, number, reserve); 1598884d179dSJan Kara spin_unlock(&dq_data_lock); 1599fd8fbfc1SDmitry Monakhov 1600fd8fbfc1SDmitry Monakhov if (reserve) 1601fd8fbfc1SDmitry Monakhov goto out_flush_warn; 1602bf097aafSJan Kara mark_all_dquot_dirty(dquots); 1603fd8fbfc1SDmitry Monakhov out_flush_warn: 1604fd8fbfc1SDmitry Monakhov up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1605bf097aafSJan Kara flush_warnings(warn); 1606fd8fbfc1SDmitry Monakhov out: 1607884d179dSJan Kara return ret; 1608884d179dSJan Kara } 16095dd4056dSChristoph Hellwig EXPORT_SYMBOL(__dquot_alloc_space); 1610884d179dSJan Kara 1611884d179dSJan Kara /* 1612884d179dSJan Kara * This operation can block, but only after everything is updated 1613884d179dSJan Kara */ 161463936ddaSChristoph Hellwig int dquot_alloc_inode(const struct inode *inode) 1615884d179dSJan Kara { 1616efd8f0e6SChristoph Hellwig int cnt, ret = 0; 1617bf097aafSJan Kara struct dquot_warn warn[MAXQUOTAS]; 1618bf097aafSJan Kara struct dquot * const *dquots = inode->i_dquot; 1619884d179dSJan Kara 1620884d179dSJan Kara /* First test before acquiring mutex - solves deadlocks when we 1621884d179dSJan Kara * re-enter the quota code and are already holding the mutex */ 1622189eef59SChristoph Hellwig if (!dquot_active(inode)) 162363936ddaSChristoph Hellwig return 0; 1624884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 1625bf097aafSJan Kara warn[cnt].w_type = QUOTA_NL_NOWARN; 1626884d179dSJan Kara down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1627884d179dSJan Kara spin_lock(&dq_data_lock); 1628884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1629bf097aafSJan Kara if (!dquots[cnt]) 1630884d179dSJan Kara continue; 1631bf097aafSJan Kara ret = check_idq(dquots[cnt], 1, &warn[cnt]); 1632efd8f0e6SChristoph Hellwig if (ret) 1633884d179dSJan Kara goto warn_put_all; 1634884d179dSJan Kara } 1635884d179dSJan Kara 1636884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1637bf097aafSJan Kara if (!dquots[cnt]) 1638884d179dSJan Kara continue; 1639bf097aafSJan Kara dquot_incr_inodes(dquots[cnt], 1); 1640884d179dSJan Kara } 1641efd8f0e6SChristoph Hellwig 1642884d179dSJan Kara warn_put_all: 1643884d179dSJan Kara spin_unlock(&dq_data_lock); 164463936ddaSChristoph Hellwig if (ret == 0) 1645bf097aafSJan Kara mark_all_dquot_dirty(dquots); 1646884d179dSJan Kara up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1647bf097aafSJan Kara flush_warnings(warn); 1648884d179dSJan Kara return ret; 1649884d179dSJan Kara } 1650884d179dSJan Kara EXPORT_SYMBOL(dquot_alloc_inode); 1651884d179dSJan Kara 16525dd4056dSChristoph Hellwig /* 16535dd4056dSChristoph Hellwig * Convert in-memory reserved quotas to real consumed quotas 16545dd4056dSChristoph Hellwig */ 16555dd4056dSChristoph Hellwig int dquot_claim_space_nodirty(struct inode *inode, qsize_t number) 1656884d179dSJan Kara { 1657884d179dSJan Kara int cnt; 1658884d179dSJan Kara 1659189eef59SChristoph Hellwig if (!dquot_active(inode)) { 1660fd8fbfc1SDmitry Monakhov inode_claim_rsv_space(inode, number); 16615dd4056dSChristoph Hellwig return 0; 1662884d179dSJan Kara } 1663884d179dSJan Kara 1664884d179dSJan Kara down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1665884d179dSJan Kara spin_lock(&dq_data_lock); 1666884d179dSJan Kara /* Claim reserved quotas to allocated quotas */ 1667884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1668dd6f3c6dSJan Kara if (inode->i_dquot[cnt]) 1669884d179dSJan Kara dquot_claim_reserved_space(inode->i_dquot[cnt], 1670884d179dSJan Kara number); 1671884d179dSJan Kara } 1672884d179dSJan Kara /* Update inode bytes */ 1673fd8fbfc1SDmitry Monakhov inode_claim_rsv_space(inode, number); 1674884d179dSJan Kara spin_unlock(&dq_data_lock); 1675dc52dd3aSDmitry Monakhov mark_all_dquot_dirty(inode->i_dquot); 1676884d179dSJan Kara up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 16775dd4056dSChristoph Hellwig return 0; 1678884d179dSJan Kara } 16795dd4056dSChristoph Hellwig EXPORT_SYMBOL(dquot_claim_space_nodirty); 1680884d179dSJan Kara 1681884d179dSJan Kara /* 1682884d179dSJan Kara * This operation can block, but only after everything is updated 1683884d179dSJan Kara */ 168456246f9aSEric Sandeen void __dquot_free_space(struct inode *inode, qsize_t number, int flags) 1685884d179dSJan Kara { 1686884d179dSJan Kara unsigned int cnt; 1687bf097aafSJan Kara struct dquot_warn warn[MAXQUOTAS]; 1688bf097aafSJan Kara struct dquot **dquots = inode->i_dquot; 168956246f9aSEric Sandeen int reserve = flags & DQUOT_SPACE_RESERVE; 1690884d179dSJan Kara 1691884d179dSJan Kara /* First test before acquiring mutex - solves deadlocks when we 1692884d179dSJan Kara * re-enter the quota code and are already holding the mutex */ 1693189eef59SChristoph Hellwig if (!dquot_active(inode)) { 1694fd8fbfc1SDmitry Monakhov inode_decr_space(inode, number, reserve); 16955dd4056dSChristoph Hellwig return; 1696884d179dSJan Kara } 1697884d179dSJan Kara 1698884d179dSJan Kara down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1699884d179dSJan Kara spin_lock(&dq_data_lock); 1700884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1701bf097aafSJan Kara int wtype; 1702bf097aafSJan Kara 1703bf097aafSJan Kara warn[cnt].w_type = QUOTA_NL_NOWARN; 1704bf097aafSJan Kara if (!dquots[cnt]) 1705884d179dSJan Kara continue; 1706bf097aafSJan Kara wtype = info_bdq_free(dquots[cnt], number); 1707bf097aafSJan Kara if (wtype != QUOTA_NL_NOWARN) 1708bf097aafSJan Kara prepare_warning(&warn[cnt], dquots[cnt], wtype); 1709fd8fbfc1SDmitry Monakhov if (reserve) 1710bf097aafSJan Kara dquot_free_reserved_space(dquots[cnt], number); 1711fd8fbfc1SDmitry Monakhov else 1712bf097aafSJan Kara dquot_decr_space(dquots[cnt], number); 1713884d179dSJan Kara } 1714fd8fbfc1SDmitry Monakhov inode_decr_space(inode, number, reserve); 1715884d179dSJan Kara spin_unlock(&dq_data_lock); 1716fd8fbfc1SDmitry Monakhov 1717fd8fbfc1SDmitry Monakhov if (reserve) 1718fd8fbfc1SDmitry Monakhov goto out_unlock; 1719bf097aafSJan Kara mark_all_dquot_dirty(dquots); 1720fd8fbfc1SDmitry Monakhov out_unlock: 1721884d179dSJan Kara up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1722bf097aafSJan Kara flush_warnings(warn); 1723884d179dSJan Kara } 17245dd4056dSChristoph Hellwig EXPORT_SYMBOL(__dquot_free_space); 1725fd8fbfc1SDmitry Monakhov 1726fd8fbfc1SDmitry Monakhov /* 1727884d179dSJan Kara * This operation can block, but only after everything is updated 1728884d179dSJan Kara */ 172963936ddaSChristoph Hellwig void dquot_free_inode(const struct inode *inode) 1730884d179dSJan Kara { 1731884d179dSJan Kara unsigned int cnt; 1732bf097aafSJan Kara struct dquot_warn warn[MAXQUOTAS]; 1733bf097aafSJan Kara struct dquot * const *dquots = inode->i_dquot; 1734884d179dSJan Kara 1735884d179dSJan Kara /* First test before acquiring mutex - solves deadlocks when we 1736884d179dSJan Kara * re-enter the quota code and are already holding the mutex */ 1737189eef59SChristoph Hellwig if (!dquot_active(inode)) 173863936ddaSChristoph Hellwig return; 1739884d179dSJan Kara 1740884d179dSJan Kara down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1741884d179dSJan Kara spin_lock(&dq_data_lock); 1742884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1743bf097aafSJan Kara int wtype; 1744bf097aafSJan Kara 1745bf097aafSJan Kara warn[cnt].w_type = QUOTA_NL_NOWARN; 1746bf097aafSJan Kara if (!dquots[cnt]) 1747884d179dSJan Kara continue; 1748bf097aafSJan Kara wtype = info_idq_free(dquots[cnt], 1); 1749bf097aafSJan Kara if (wtype != QUOTA_NL_NOWARN) 1750bf097aafSJan Kara prepare_warning(&warn[cnt], dquots[cnt], wtype); 1751bf097aafSJan Kara dquot_decr_inodes(dquots[cnt], 1); 1752884d179dSJan Kara } 1753884d179dSJan Kara spin_unlock(&dq_data_lock); 1754bf097aafSJan Kara mark_all_dquot_dirty(dquots); 1755884d179dSJan Kara up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1756bf097aafSJan Kara flush_warnings(warn); 1757884d179dSJan Kara } 1758884d179dSJan Kara EXPORT_SYMBOL(dquot_free_inode); 1759884d179dSJan Kara 1760884d179dSJan Kara /* 1761884d179dSJan Kara * Transfer the number of inode and blocks from one diskquota to an other. 1762bc8e5f07SJan Kara * On success, dquot references in transfer_to are consumed and references 1763bc8e5f07SJan Kara * to original dquots that need to be released are placed there. On failure, 1764bc8e5f07SJan Kara * references are kept untouched. 1765884d179dSJan Kara * 1766884d179dSJan Kara * This operation can block, but only after everything is updated 1767884d179dSJan Kara * A transaction must be started when entering this function. 1768bc8e5f07SJan Kara * 1769884d179dSJan Kara */ 1770bc8e5f07SJan Kara int __dquot_transfer(struct inode *inode, struct dquot **transfer_to) 1771884d179dSJan Kara { 1772884d179dSJan Kara qsize_t space, cur_space; 1773884d179dSJan Kara qsize_t rsv_space = 0; 1774bc8e5f07SJan Kara struct dquot *transfer_from[MAXQUOTAS] = {}; 1775efd8f0e6SChristoph Hellwig int cnt, ret = 0; 17769e32784bSDmitry char is_valid[MAXQUOTAS] = {}; 1777bf097aafSJan Kara struct dquot_warn warn_to[MAXQUOTAS]; 1778bf097aafSJan Kara struct dquot_warn warn_from_inodes[MAXQUOTAS]; 1779bf097aafSJan Kara struct dquot_warn warn_from_space[MAXQUOTAS]; 1780884d179dSJan Kara 1781884d179dSJan Kara /* First test before acquiring mutex - solves deadlocks when we 1782884d179dSJan Kara * re-enter the quota code and are already holding the mutex */ 1783884d179dSJan Kara if (IS_NOQUOTA(inode)) 1784efd8f0e6SChristoph Hellwig return 0; 1785884d179dSJan Kara /* Initialize the arrays */ 1786bf097aafSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1787bf097aafSJan Kara warn_to[cnt].w_type = QUOTA_NL_NOWARN; 1788bf097aafSJan Kara warn_from_inodes[cnt].w_type = QUOTA_NL_NOWARN; 1789bf097aafSJan Kara warn_from_space[cnt].w_type = QUOTA_NL_NOWARN; 1790bf097aafSJan Kara } 1791884d179dSJan Kara down_write(&sb_dqopt(inode->i_sb)->dqptr_sem); 1792884d179dSJan Kara if (IS_NOQUOTA(inode)) { /* File without quota accounting? */ 1793884d179dSJan Kara up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); 1794bc8e5f07SJan Kara return 0; 1795884d179dSJan Kara } 1796884d179dSJan Kara spin_lock(&dq_data_lock); 1797884d179dSJan Kara cur_space = inode_get_bytes(inode); 1798fd8fbfc1SDmitry Monakhov rsv_space = inode_get_rsv_space(inode); 1799884d179dSJan Kara space = cur_space + rsv_space; 1800884d179dSJan Kara /* Build the transfer_from list and check the limits */ 1801884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 18029e32784bSDmitry /* 18039e32784bSDmitry * Skip changes for same uid or gid or for turned off quota-type. 18049e32784bSDmitry */ 1805dd6f3c6dSJan Kara if (!transfer_to[cnt]) 1806884d179dSJan Kara continue; 18079e32784bSDmitry /* Avoid races with quotaoff() */ 18089e32784bSDmitry if (!sb_has_quota_active(inode->i_sb, cnt)) 18099e32784bSDmitry continue; 18109e32784bSDmitry is_valid[cnt] = 1; 1811884d179dSJan Kara transfer_from[cnt] = inode->i_dquot[cnt]; 1812bf097aafSJan Kara ret = check_idq(transfer_to[cnt], 1, &warn_to[cnt]); 1813efd8f0e6SChristoph Hellwig if (ret) 1814efd8f0e6SChristoph Hellwig goto over_quota; 1815bf097aafSJan Kara ret = check_bdq(transfer_to[cnt], space, 0, &warn_to[cnt]); 1816efd8f0e6SChristoph Hellwig if (ret) 1817884d179dSJan Kara goto over_quota; 1818884d179dSJan Kara } 1819884d179dSJan Kara 1820884d179dSJan Kara /* 1821884d179dSJan Kara * Finally perform the needed transfer from transfer_from to transfer_to 1822884d179dSJan Kara */ 1823884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 18249e32784bSDmitry if (!is_valid[cnt]) 1825884d179dSJan Kara continue; 1826884d179dSJan Kara /* Due to IO error we might not have transfer_from[] structure */ 1827884d179dSJan Kara if (transfer_from[cnt]) { 1828bf097aafSJan Kara int wtype; 1829bf097aafSJan Kara wtype = info_idq_free(transfer_from[cnt], 1); 1830bf097aafSJan Kara if (wtype != QUOTA_NL_NOWARN) 1831bf097aafSJan Kara prepare_warning(&warn_from_inodes[cnt], 1832bf097aafSJan Kara transfer_from[cnt], wtype); 1833bf097aafSJan Kara wtype = info_bdq_free(transfer_from[cnt], space); 1834bf097aafSJan Kara if (wtype != QUOTA_NL_NOWARN) 1835bf097aafSJan Kara prepare_warning(&warn_from_space[cnt], 1836bf097aafSJan Kara transfer_from[cnt], wtype); 1837884d179dSJan Kara dquot_decr_inodes(transfer_from[cnt], 1); 1838884d179dSJan Kara dquot_decr_space(transfer_from[cnt], cur_space); 1839884d179dSJan Kara dquot_free_reserved_space(transfer_from[cnt], 1840884d179dSJan Kara rsv_space); 1841884d179dSJan Kara } 1842884d179dSJan Kara 1843884d179dSJan Kara dquot_incr_inodes(transfer_to[cnt], 1); 1844884d179dSJan Kara dquot_incr_space(transfer_to[cnt], cur_space); 1845884d179dSJan Kara dquot_resv_space(transfer_to[cnt], rsv_space); 1846884d179dSJan Kara 1847884d179dSJan Kara inode->i_dquot[cnt] = transfer_to[cnt]; 1848884d179dSJan Kara } 1849884d179dSJan Kara spin_unlock(&dq_data_lock); 1850884d179dSJan Kara up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); 1851884d179dSJan Kara 1852dc52dd3aSDmitry Monakhov mark_all_dquot_dirty(transfer_from); 1853dc52dd3aSDmitry Monakhov mark_all_dquot_dirty(transfer_to); 1854bf097aafSJan Kara flush_warnings(warn_to); 1855bf097aafSJan Kara flush_warnings(warn_from_inodes); 1856bf097aafSJan Kara flush_warnings(warn_from_space); 1857bc8e5f07SJan Kara /* Pass back references to put */ 1858dc52dd3aSDmitry Monakhov for (cnt = 0; cnt < MAXQUOTAS; cnt++) 18599e32784bSDmitry if (is_valid[cnt]) 1860bc8e5f07SJan Kara transfer_to[cnt] = transfer_from[cnt]; 186186f3cbecSJan Kara return 0; 1862884d179dSJan Kara over_quota: 1863884d179dSJan Kara spin_unlock(&dq_data_lock); 1864884d179dSJan Kara up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); 1865bf097aafSJan Kara flush_warnings(warn_to); 186686f3cbecSJan Kara return ret; 1867884d179dSJan Kara } 1868bc8e5f07SJan Kara EXPORT_SYMBOL(__dquot_transfer); 1869884d179dSJan Kara 18708ddd69d6SDmitry Monakhov /* Wrapper for transferring ownership of an inode for uid/gid only 18718ddd69d6SDmitry Monakhov * Called from FSXXX_setattr() 18728ddd69d6SDmitry Monakhov */ 1873b43fa828SChristoph Hellwig int dquot_transfer(struct inode *inode, struct iattr *iattr) 1874884d179dSJan Kara { 1875bc8e5f07SJan Kara struct dquot *transfer_to[MAXQUOTAS] = {}; 1876bc8e5f07SJan Kara struct super_block *sb = inode->i_sb; 1877bc8e5f07SJan Kara int ret; 18788ddd69d6SDmitry Monakhov 1879189eef59SChristoph Hellwig if (!dquot_active(inode)) 1880884d179dSJan Kara return 0; 1881bc8e5f07SJan Kara 1882bc8e5f07SJan Kara if (iattr->ia_valid & ATTR_UID && iattr->ia_uid != inode->i_uid) 1883bc8e5f07SJan Kara transfer_to[USRQUOTA] = dqget(sb, iattr->ia_uid, USRQUOTA); 1884bc8e5f07SJan Kara if (iattr->ia_valid & ATTR_GID && iattr->ia_gid != inode->i_gid) 18854dea4969SJan Kara transfer_to[GRPQUOTA] = dqget(sb, iattr->ia_gid, GRPQUOTA); 1886bc8e5f07SJan Kara 1887bc8e5f07SJan Kara ret = __dquot_transfer(inode, transfer_to); 1888bc8e5f07SJan Kara dqput_all(transfer_to); 1889bc8e5f07SJan Kara return ret; 1890884d179dSJan Kara } 1891b43fa828SChristoph Hellwig EXPORT_SYMBOL(dquot_transfer); 1892884d179dSJan Kara 1893884d179dSJan Kara /* 1894884d179dSJan Kara * Write info of quota file to disk 1895884d179dSJan Kara */ 1896884d179dSJan Kara int dquot_commit_info(struct super_block *sb, int type) 1897884d179dSJan Kara { 1898884d179dSJan Kara int ret; 1899884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 1900884d179dSJan Kara 1901884d179dSJan Kara mutex_lock(&dqopt->dqio_mutex); 1902884d179dSJan Kara ret = dqopt->ops[type]->write_file_info(sb, type); 1903884d179dSJan Kara mutex_unlock(&dqopt->dqio_mutex); 1904884d179dSJan Kara return ret; 1905884d179dSJan Kara } 1906884d179dSJan Kara EXPORT_SYMBOL(dquot_commit_info); 1907884d179dSJan Kara 1908884d179dSJan Kara /* 1909884d179dSJan Kara * Definitions of diskquota operations. 1910884d179dSJan Kara */ 191161e225dcSAlexey Dobriyan const struct dquot_operations dquot_operations = { 1912884d179dSJan Kara .write_dquot = dquot_commit, 1913884d179dSJan Kara .acquire_dquot = dquot_acquire, 1914884d179dSJan Kara .release_dquot = dquot_release, 1915884d179dSJan Kara .mark_dirty = dquot_mark_dquot_dirty, 1916884d179dSJan Kara .write_info = dquot_commit_info, 1917884d179dSJan Kara .alloc_dquot = dquot_alloc, 1918884d179dSJan Kara .destroy_dquot = dquot_destroy, 1919884d179dSJan Kara }; 1920123e9cafSChristoph Hellwig EXPORT_SYMBOL(dquot_operations); 1921884d179dSJan Kara 1922884d179dSJan Kara /* 1923907f4554SChristoph Hellwig * Generic helper for ->open on filesystems supporting disk quotas. 1924907f4554SChristoph Hellwig */ 1925907f4554SChristoph Hellwig int dquot_file_open(struct inode *inode, struct file *file) 1926907f4554SChristoph Hellwig { 1927907f4554SChristoph Hellwig int error; 1928907f4554SChristoph Hellwig 1929907f4554SChristoph Hellwig error = generic_file_open(inode, file); 1930907f4554SChristoph Hellwig if (!error && (file->f_mode & FMODE_WRITE)) 1931871a2931SChristoph Hellwig dquot_initialize(inode); 1932907f4554SChristoph Hellwig return error; 1933907f4554SChristoph Hellwig } 1934907f4554SChristoph Hellwig EXPORT_SYMBOL(dquot_file_open); 1935907f4554SChristoph Hellwig 1936907f4554SChristoph Hellwig /* 1937884d179dSJan Kara * Turn quota off on a device. type == -1 ==> quotaoff for all types (umount) 1938884d179dSJan Kara */ 19390f0dd62fSChristoph Hellwig int dquot_disable(struct super_block *sb, int type, unsigned int flags) 1940884d179dSJan Kara { 1941884d179dSJan Kara int cnt, ret = 0; 1942884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 1943884d179dSJan Kara struct inode *toputinode[MAXQUOTAS]; 1944884d179dSJan Kara 1945884d179dSJan Kara /* Cannot turn off usage accounting without turning off limits, or 1946884d179dSJan Kara * suspend quotas and simultaneously turn quotas off. */ 1947884d179dSJan Kara if ((flags & DQUOT_USAGE_ENABLED && !(flags & DQUOT_LIMITS_ENABLED)) 1948884d179dSJan Kara || (flags & DQUOT_SUSPENDED && flags & (DQUOT_LIMITS_ENABLED | 1949884d179dSJan Kara DQUOT_USAGE_ENABLED))) 1950884d179dSJan Kara return -EINVAL; 1951884d179dSJan Kara 1952884d179dSJan Kara /* We need to serialize quota_off() for device */ 1953884d179dSJan Kara mutex_lock(&dqopt->dqonoff_mutex); 1954884d179dSJan Kara 1955884d179dSJan Kara /* 1956884d179dSJan Kara * Skip everything if there's nothing to do. We have to do this because 1957884d179dSJan Kara * sometimes we are called when fill_super() failed and calling 1958884d179dSJan Kara * sync_fs() in such cases does no good. 1959884d179dSJan Kara */ 1960884d179dSJan Kara if (!sb_any_quota_loaded(sb)) { 1961884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 1962884d179dSJan Kara return 0; 1963884d179dSJan Kara } 1964884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1965884d179dSJan Kara toputinode[cnt] = NULL; 1966884d179dSJan Kara if (type != -1 && cnt != type) 1967884d179dSJan Kara continue; 1968884d179dSJan Kara if (!sb_has_quota_loaded(sb, cnt)) 1969884d179dSJan Kara continue; 1970884d179dSJan Kara 1971884d179dSJan Kara if (flags & DQUOT_SUSPENDED) { 1972884d179dSJan Kara spin_lock(&dq_state_lock); 1973884d179dSJan Kara dqopt->flags |= 1974884d179dSJan Kara dquot_state_flag(DQUOT_SUSPENDED, cnt); 1975884d179dSJan Kara spin_unlock(&dq_state_lock); 1976884d179dSJan Kara } else { 1977884d179dSJan Kara spin_lock(&dq_state_lock); 1978884d179dSJan Kara dqopt->flags &= ~dquot_state_flag(flags, cnt); 1979884d179dSJan Kara /* Turning off suspended quotas? */ 1980884d179dSJan Kara if (!sb_has_quota_loaded(sb, cnt) && 1981884d179dSJan Kara sb_has_quota_suspended(sb, cnt)) { 1982884d179dSJan Kara dqopt->flags &= ~dquot_state_flag( 1983884d179dSJan Kara DQUOT_SUSPENDED, cnt); 1984884d179dSJan Kara spin_unlock(&dq_state_lock); 1985884d179dSJan Kara iput(dqopt->files[cnt]); 1986884d179dSJan Kara dqopt->files[cnt] = NULL; 1987884d179dSJan Kara continue; 1988884d179dSJan Kara } 1989884d179dSJan Kara spin_unlock(&dq_state_lock); 1990884d179dSJan Kara } 1991884d179dSJan Kara 1992884d179dSJan Kara /* We still have to keep quota loaded? */ 1993884d179dSJan Kara if (sb_has_quota_loaded(sb, cnt) && !(flags & DQUOT_SUSPENDED)) 1994884d179dSJan Kara continue; 1995884d179dSJan Kara 1996884d179dSJan Kara /* Note: these are blocking operations */ 1997884d179dSJan Kara drop_dquot_ref(sb, cnt); 1998884d179dSJan Kara invalidate_dquots(sb, cnt); 1999884d179dSJan Kara /* 2000268157baSJan Kara * Now all dquots should be invalidated, all writes done so we 2001268157baSJan Kara * should be only users of the info. No locks needed. 2002884d179dSJan Kara */ 2003884d179dSJan Kara if (info_dirty(&dqopt->info[cnt])) 2004884d179dSJan Kara sb->dq_op->write_info(sb, cnt); 2005884d179dSJan Kara if (dqopt->ops[cnt]->free_file_info) 2006884d179dSJan Kara dqopt->ops[cnt]->free_file_info(sb, cnt); 2007884d179dSJan Kara put_quota_format(dqopt->info[cnt].dqi_format); 2008884d179dSJan Kara 2009884d179dSJan Kara toputinode[cnt] = dqopt->files[cnt]; 2010884d179dSJan Kara if (!sb_has_quota_loaded(sb, cnt)) 2011884d179dSJan Kara dqopt->files[cnt] = NULL; 2012884d179dSJan Kara dqopt->info[cnt].dqi_flags = 0; 2013884d179dSJan Kara dqopt->info[cnt].dqi_igrace = 0; 2014884d179dSJan Kara dqopt->info[cnt].dqi_bgrace = 0; 2015884d179dSJan Kara dqopt->ops[cnt] = NULL; 2016884d179dSJan Kara } 2017884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 2018884d179dSJan Kara 2019884d179dSJan Kara /* Skip syncing and setting flags if quota files are hidden */ 2020884d179dSJan Kara if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) 2021884d179dSJan Kara goto put_inodes; 2022884d179dSJan Kara 2023884d179dSJan Kara /* Sync the superblock so that buffers with quota data are written to 2024884d179dSJan Kara * disk (and so userspace sees correct data afterwards). */ 2025884d179dSJan Kara if (sb->s_op->sync_fs) 2026884d179dSJan Kara sb->s_op->sync_fs(sb, 1); 2027884d179dSJan Kara sync_blockdev(sb->s_bdev); 2028884d179dSJan Kara /* Now the quota files are just ordinary files and we can set the 2029884d179dSJan Kara * inode flags back. Moreover we discard the pagecache so that 2030884d179dSJan Kara * userspace sees the writes we did bypassing the pagecache. We 2031884d179dSJan Kara * must also discard the blockdev buffers so that we see the 2032884d179dSJan Kara * changes done by userspace on the next quotaon() */ 2033884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 2034884d179dSJan Kara if (toputinode[cnt]) { 2035884d179dSJan Kara mutex_lock(&dqopt->dqonoff_mutex); 2036884d179dSJan Kara /* If quota was reenabled in the meantime, we have 2037884d179dSJan Kara * nothing to do */ 2038884d179dSJan Kara if (!sb_has_quota_loaded(sb, cnt)) { 2039*a80b12c3SJan Kara mutex_lock(&toputinode[cnt]->i_mutex); 2040884d179dSJan Kara toputinode[cnt]->i_flags &= ~(S_IMMUTABLE | 2041884d179dSJan Kara S_NOATIME | S_NOQUOTA); 2042268157baSJan Kara truncate_inode_pages(&toputinode[cnt]->i_data, 2043268157baSJan Kara 0); 2044884d179dSJan Kara mutex_unlock(&toputinode[cnt]->i_mutex); 204543d2932dSJan Kara mark_inode_dirty_sync(toputinode[cnt]); 2046884d179dSJan Kara } 2047884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 2048884d179dSJan Kara } 2049884d179dSJan Kara if (sb->s_bdev) 2050884d179dSJan Kara invalidate_bdev(sb->s_bdev); 2051884d179dSJan Kara put_inodes: 2052884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 2053884d179dSJan Kara if (toputinode[cnt]) { 2054884d179dSJan Kara /* On remount RO, we keep the inode pointer so that we 2055884d179dSJan Kara * can reenable quota on the subsequent remount RW. We 2056884d179dSJan Kara * have to check 'flags' variable and not use sb_has_ 2057884d179dSJan Kara * function because another quotaon / quotaoff could 2058884d179dSJan Kara * change global state before we got here. We refuse 2059884d179dSJan Kara * to suspend quotas when there is pending delete on 2060884d179dSJan Kara * the quota file... */ 2061884d179dSJan Kara if (!(flags & DQUOT_SUSPENDED)) 2062884d179dSJan Kara iput(toputinode[cnt]); 2063884d179dSJan Kara else if (!toputinode[cnt]->i_nlink) 2064884d179dSJan Kara ret = -EBUSY; 2065884d179dSJan Kara } 2066884d179dSJan Kara return ret; 2067884d179dSJan Kara } 20680f0dd62fSChristoph Hellwig EXPORT_SYMBOL(dquot_disable); 2069884d179dSJan Kara 2070287a8095SChristoph Hellwig int dquot_quota_off(struct super_block *sb, int type) 2071884d179dSJan Kara { 20720f0dd62fSChristoph Hellwig return dquot_disable(sb, type, 20730f0dd62fSChristoph Hellwig DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); 2074884d179dSJan Kara } 2075287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_quota_off); 20760f0dd62fSChristoph Hellwig 2077884d179dSJan Kara /* 2078884d179dSJan Kara * Turn quotas on on a device 2079884d179dSJan Kara */ 2080884d179dSJan Kara 2081884d179dSJan Kara /* 2082884d179dSJan Kara * Helper function to turn quotas on when we already have the inode of 2083884d179dSJan Kara * quota file and no quota information is loaded. 2084884d179dSJan Kara */ 2085884d179dSJan Kara static int vfs_load_quota_inode(struct inode *inode, int type, int format_id, 2086884d179dSJan Kara unsigned int flags) 2087884d179dSJan Kara { 2088884d179dSJan Kara struct quota_format_type *fmt = find_quota_format(format_id); 2089884d179dSJan Kara struct super_block *sb = inode->i_sb; 2090884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 2091884d179dSJan Kara int error; 2092884d179dSJan Kara int oldflags = -1; 2093884d179dSJan Kara 2094884d179dSJan Kara if (!fmt) 2095884d179dSJan Kara return -ESRCH; 2096884d179dSJan Kara if (!S_ISREG(inode->i_mode)) { 2097884d179dSJan Kara error = -EACCES; 2098884d179dSJan Kara goto out_fmt; 2099884d179dSJan Kara } 2100884d179dSJan Kara if (IS_RDONLY(inode)) { 2101884d179dSJan Kara error = -EROFS; 2102884d179dSJan Kara goto out_fmt; 2103884d179dSJan Kara } 2104884d179dSJan Kara if (!sb->s_op->quota_write || !sb->s_op->quota_read) { 2105884d179dSJan Kara error = -EINVAL; 2106884d179dSJan Kara goto out_fmt; 2107884d179dSJan Kara } 2108884d179dSJan Kara /* Usage always has to be set... */ 2109884d179dSJan Kara if (!(flags & DQUOT_USAGE_ENABLED)) { 2110884d179dSJan Kara error = -EINVAL; 2111884d179dSJan Kara goto out_fmt; 2112884d179dSJan Kara } 2113884d179dSJan Kara 2114884d179dSJan Kara if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) { 2115ab94c39bSJan Kara /* As we bypass the pagecache we must now flush all the 2116ab94c39bSJan Kara * dirty data and invalidate caches so that kernel sees 2117ab94c39bSJan Kara * changes from userspace. It is not enough to just flush 2118ab94c39bSJan Kara * the quota file since if blocksize < pagesize, invalidation 2119ab94c39bSJan Kara * of the cache could fail because of other unrelated dirty 2120ab94c39bSJan Kara * data */ 2121ab94c39bSJan Kara sync_filesystem(sb); 2122884d179dSJan Kara invalidate_bdev(sb->s_bdev); 2123884d179dSJan Kara } 2124884d179dSJan Kara mutex_lock(&dqopt->dqonoff_mutex); 2125884d179dSJan Kara if (sb_has_quota_loaded(sb, type)) { 2126884d179dSJan Kara error = -EBUSY; 2127884d179dSJan Kara goto out_lock; 2128884d179dSJan Kara } 2129884d179dSJan Kara 2130884d179dSJan Kara if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) { 2131884d179dSJan Kara /* We don't want quota and atime on quota files (deadlocks 2132884d179dSJan Kara * possible) Also nobody should write to the file - we use 2133884d179dSJan Kara * special IO operations which ignore the immutable bit. */ 2134*a80b12c3SJan Kara mutex_lock(&inode->i_mutex); 2135268157baSJan Kara oldflags = inode->i_flags & (S_NOATIME | S_IMMUTABLE | 2136268157baSJan Kara S_NOQUOTA); 2137884d179dSJan Kara inode->i_flags |= S_NOQUOTA | S_NOATIME | S_IMMUTABLE; 2138dee86565SJan Kara mutex_unlock(&inode->i_mutex); 213926245c94SJan Kara /* 214026245c94SJan Kara * When S_NOQUOTA is set, remove dquot references as no more 214126245c94SJan Kara * references can be added 214226245c94SJan Kara */ 21439f754758SChristoph Hellwig __dquot_drop(inode); 2144884d179dSJan Kara } 2145884d179dSJan Kara 2146884d179dSJan Kara error = -EIO; 2147884d179dSJan Kara dqopt->files[type] = igrab(inode); 2148884d179dSJan Kara if (!dqopt->files[type]) 2149884d179dSJan Kara goto out_lock; 2150884d179dSJan Kara error = -EINVAL; 2151884d179dSJan Kara if (!fmt->qf_ops->check_quota_file(sb, type)) 2152884d179dSJan Kara goto out_file_init; 2153884d179dSJan Kara 2154884d179dSJan Kara dqopt->ops[type] = fmt->qf_ops; 2155884d179dSJan Kara dqopt->info[type].dqi_format = fmt; 2156884d179dSJan Kara dqopt->info[type].dqi_fmt_id = format_id; 2157884d179dSJan Kara INIT_LIST_HEAD(&dqopt->info[type].dqi_dirty_list); 2158884d179dSJan Kara mutex_lock(&dqopt->dqio_mutex); 2159268157baSJan Kara error = dqopt->ops[type]->read_file_info(sb, type); 2160268157baSJan Kara if (error < 0) { 2161884d179dSJan Kara mutex_unlock(&dqopt->dqio_mutex); 2162884d179dSJan Kara goto out_file_init; 2163884d179dSJan Kara } 216446fe44ceSJan Kara if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) 216546fe44ceSJan Kara dqopt->info[type].dqi_flags |= DQF_SYS_FILE; 2166884d179dSJan Kara mutex_unlock(&dqopt->dqio_mutex); 2167884d179dSJan Kara spin_lock(&dq_state_lock); 2168884d179dSJan Kara dqopt->flags |= dquot_state_flag(flags, type); 2169884d179dSJan Kara spin_unlock(&dq_state_lock); 2170884d179dSJan Kara 2171884d179dSJan Kara add_dquot_ref(sb, type); 2172884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 2173884d179dSJan Kara 2174884d179dSJan Kara return 0; 2175884d179dSJan Kara 2176884d179dSJan Kara out_file_init: 2177884d179dSJan Kara dqopt->files[type] = NULL; 2178884d179dSJan Kara iput(inode); 2179884d179dSJan Kara out_lock: 2180884d179dSJan Kara if (oldflags != -1) { 2181*a80b12c3SJan Kara mutex_lock(&inode->i_mutex); 2182884d179dSJan Kara /* Set the flags back (in the case of accidental quotaon() 2183884d179dSJan Kara * on a wrong file we don't want to mess up the flags) */ 2184884d179dSJan Kara inode->i_flags &= ~(S_NOATIME | S_NOQUOTA | S_IMMUTABLE); 2185884d179dSJan Kara inode->i_flags |= oldflags; 2186dee86565SJan Kara mutex_unlock(&inode->i_mutex); 2187884d179dSJan Kara } 2188d01730d7SJiaying Zhang mutex_unlock(&dqopt->dqonoff_mutex); 2189884d179dSJan Kara out_fmt: 2190884d179dSJan Kara put_quota_format(fmt); 2191884d179dSJan Kara 2192884d179dSJan Kara return error; 2193884d179dSJan Kara } 2194884d179dSJan Kara 2195884d179dSJan Kara /* Reenable quotas on remount RW */ 21960f0dd62fSChristoph Hellwig int dquot_resume(struct super_block *sb, int type) 2197884d179dSJan Kara { 2198884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 2199884d179dSJan Kara struct inode *inode; 22000f0dd62fSChristoph Hellwig int ret = 0, cnt; 2201884d179dSJan Kara unsigned int flags; 2202884d179dSJan Kara 22030f0dd62fSChristoph Hellwig for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 22040f0dd62fSChristoph Hellwig if (type != -1 && cnt != type) 22050f0dd62fSChristoph Hellwig continue; 22060f0dd62fSChristoph Hellwig 2207884d179dSJan Kara mutex_lock(&dqopt->dqonoff_mutex); 22080f0dd62fSChristoph Hellwig if (!sb_has_quota_suspended(sb, cnt)) { 2209884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 22100f0dd62fSChristoph Hellwig continue; 2211884d179dSJan Kara } 22120f0dd62fSChristoph Hellwig inode = dqopt->files[cnt]; 22130f0dd62fSChristoph Hellwig dqopt->files[cnt] = NULL; 2214884d179dSJan Kara spin_lock(&dq_state_lock); 2215884d179dSJan Kara flags = dqopt->flags & dquot_state_flag(DQUOT_USAGE_ENABLED | 22160f0dd62fSChristoph Hellwig DQUOT_LIMITS_ENABLED, 22170f0dd62fSChristoph Hellwig cnt); 22180f0dd62fSChristoph Hellwig dqopt->flags &= ~dquot_state_flag(DQUOT_STATE_FLAGS, cnt); 2219884d179dSJan Kara spin_unlock(&dq_state_lock); 2220884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 2221884d179dSJan Kara 22220f0dd62fSChristoph Hellwig flags = dquot_generic_flag(flags, cnt); 22230f0dd62fSChristoph Hellwig ret = vfs_load_quota_inode(inode, cnt, 22240f0dd62fSChristoph Hellwig dqopt->info[cnt].dqi_fmt_id, flags); 2225884d179dSJan Kara iput(inode); 22260f0dd62fSChristoph Hellwig } 2227884d179dSJan Kara 2228884d179dSJan Kara return ret; 2229884d179dSJan Kara } 22300f0dd62fSChristoph Hellwig EXPORT_SYMBOL(dquot_resume); 2231884d179dSJan Kara 2232f00c9e44SJan Kara int dquot_quota_on(struct super_block *sb, int type, int format_id, 2233884d179dSJan Kara struct path *path) 2234884d179dSJan Kara { 2235884d179dSJan Kara int error = security_quota_on(path->dentry); 2236884d179dSJan Kara if (error) 2237884d179dSJan Kara return error; 2238884d179dSJan Kara /* Quota file not on the same filesystem? */ 2239d8c9584eSAl Viro if (path->dentry->d_sb != sb) 2240884d179dSJan Kara error = -EXDEV; 2241884d179dSJan Kara else 2242884d179dSJan Kara error = vfs_load_quota_inode(path->dentry->d_inode, type, 2243884d179dSJan Kara format_id, DQUOT_USAGE_ENABLED | 2244884d179dSJan Kara DQUOT_LIMITS_ENABLED); 2245884d179dSJan Kara return error; 2246884d179dSJan Kara } 2247287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_quota_on); 2248884d179dSJan Kara 2249884d179dSJan Kara /* 2250884d179dSJan Kara * More powerful function for turning on quotas allowing setting 2251884d179dSJan Kara * of individual quota flags 2252884d179dSJan Kara */ 2253287a8095SChristoph Hellwig int dquot_enable(struct inode *inode, int type, int format_id, 2254884d179dSJan Kara unsigned int flags) 2255884d179dSJan Kara { 2256884d179dSJan Kara int ret = 0; 2257884d179dSJan Kara struct super_block *sb = inode->i_sb; 2258884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 2259884d179dSJan Kara 2260884d179dSJan Kara /* Just unsuspend quotas? */ 22610f0dd62fSChristoph Hellwig BUG_ON(flags & DQUOT_SUSPENDED); 22620f0dd62fSChristoph Hellwig 2263884d179dSJan Kara if (!flags) 2264884d179dSJan Kara return 0; 2265884d179dSJan Kara /* Just updating flags needed? */ 2266884d179dSJan Kara if (sb_has_quota_loaded(sb, type)) { 2267884d179dSJan Kara mutex_lock(&dqopt->dqonoff_mutex); 2268884d179dSJan Kara /* Now do a reliable test... */ 2269884d179dSJan Kara if (!sb_has_quota_loaded(sb, type)) { 2270884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 2271884d179dSJan Kara goto load_quota; 2272884d179dSJan Kara } 2273884d179dSJan Kara if (flags & DQUOT_USAGE_ENABLED && 2274884d179dSJan Kara sb_has_quota_usage_enabled(sb, type)) { 2275884d179dSJan Kara ret = -EBUSY; 2276884d179dSJan Kara goto out_lock; 2277884d179dSJan Kara } 2278884d179dSJan Kara if (flags & DQUOT_LIMITS_ENABLED && 2279884d179dSJan Kara sb_has_quota_limits_enabled(sb, type)) { 2280884d179dSJan Kara ret = -EBUSY; 2281884d179dSJan Kara goto out_lock; 2282884d179dSJan Kara } 2283884d179dSJan Kara spin_lock(&dq_state_lock); 2284884d179dSJan Kara sb_dqopt(sb)->flags |= dquot_state_flag(flags, type); 2285884d179dSJan Kara spin_unlock(&dq_state_lock); 2286884d179dSJan Kara out_lock: 2287884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 2288884d179dSJan Kara return ret; 2289884d179dSJan Kara } 2290884d179dSJan Kara 2291884d179dSJan Kara load_quota: 2292884d179dSJan Kara return vfs_load_quota_inode(inode, type, format_id, flags); 2293884d179dSJan Kara } 2294287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_enable); 2295884d179dSJan Kara 2296884d179dSJan Kara /* 2297884d179dSJan Kara * This function is used when filesystem needs to initialize quotas 2298884d179dSJan Kara * during mount time. 2299884d179dSJan Kara */ 2300287a8095SChristoph Hellwig int dquot_quota_on_mount(struct super_block *sb, char *qf_name, 2301884d179dSJan Kara int format_id, int type) 2302884d179dSJan Kara { 2303884d179dSJan Kara struct dentry *dentry; 2304884d179dSJan Kara int error; 2305884d179dSJan Kara 2306c56818d7SJan Kara mutex_lock(&sb->s_root->d_inode->i_mutex); 2307884d179dSJan Kara dentry = lookup_one_len(qf_name, sb->s_root, strlen(qf_name)); 2308c56818d7SJan Kara mutex_unlock(&sb->s_root->d_inode->i_mutex); 2309884d179dSJan Kara if (IS_ERR(dentry)) 2310884d179dSJan Kara return PTR_ERR(dentry); 2311884d179dSJan Kara 2312884d179dSJan Kara if (!dentry->d_inode) { 2313884d179dSJan Kara error = -ENOENT; 2314884d179dSJan Kara goto out; 2315884d179dSJan Kara } 2316884d179dSJan Kara 2317884d179dSJan Kara error = security_quota_on(dentry); 2318884d179dSJan Kara if (!error) 2319884d179dSJan Kara error = vfs_load_quota_inode(dentry->d_inode, type, format_id, 2320884d179dSJan Kara DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); 2321884d179dSJan Kara 2322884d179dSJan Kara out: 2323884d179dSJan Kara dput(dentry); 2324884d179dSJan Kara return error; 2325884d179dSJan Kara } 2326287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_quota_on_mount); 2327884d179dSJan Kara 2328884d179dSJan Kara static inline qsize_t qbtos(qsize_t blocks) 2329884d179dSJan Kara { 2330884d179dSJan Kara return blocks << QIF_DQBLKSIZE_BITS; 2331884d179dSJan Kara } 2332884d179dSJan Kara 2333884d179dSJan Kara static inline qsize_t stoqb(qsize_t space) 2334884d179dSJan Kara { 2335884d179dSJan Kara return (space + QIF_DQBLKSIZE - 1) >> QIF_DQBLKSIZE_BITS; 2336884d179dSJan Kara } 2337884d179dSJan Kara 2338884d179dSJan Kara /* Generic routine for getting common part of quota structure */ 2339b9b2dd36SChristoph Hellwig static void do_get_dqblk(struct dquot *dquot, struct fs_disk_quota *di) 2340884d179dSJan Kara { 2341884d179dSJan Kara struct mem_dqblk *dm = &dquot->dq_dqb; 2342884d179dSJan Kara 2343b9b2dd36SChristoph Hellwig memset(di, 0, sizeof(*di)); 2344b9b2dd36SChristoph Hellwig di->d_version = FS_DQUOT_VERSION; 2345b9b2dd36SChristoph Hellwig di->d_flags = dquot->dq_type == USRQUOTA ? 2346ade7ce31SChristoph Hellwig FS_USER_QUOTA : FS_GROUP_QUOTA; 2347b9b2dd36SChristoph Hellwig di->d_id = dquot->dq_id; 2348b9b2dd36SChristoph Hellwig 2349884d179dSJan Kara spin_lock(&dq_data_lock); 2350b9b2dd36SChristoph Hellwig di->d_blk_hardlimit = stoqb(dm->dqb_bhardlimit); 2351b9b2dd36SChristoph Hellwig di->d_blk_softlimit = stoqb(dm->dqb_bsoftlimit); 2352b9b2dd36SChristoph Hellwig di->d_ino_hardlimit = dm->dqb_ihardlimit; 2353b9b2dd36SChristoph Hellwig di->d_ino_softlimit = dm->dqb_isoftlimit; 2354b9b2dd36SChristoph Hellwig di->d_bcount = dm->dqb_curspace + dm->dqb_rsvspace; 2355b9b2dd36SChristoph Hellwig di->d_icount = dm->dqb_curinodes; 2356b9b2dd36SChristoph Hellwig di->d_btimer = dm->dqb_btime; 2357b9b2dd36SChristoph Hellwig di->d_itimer = dm->dqb_itime; 2358884d179dSJan Kara spin_unlock(&dq_data_lock); 2359884d179dSJan Kara } 2360884d179dSJan Kara 2361287a8095SChristoph Hellwig int dquot_get_dqblk(struct super_block *sb, int type, qid_t id, 2362b9b2dd36SChristoph Hellwig struct fs_disk_quota *di) 2363884d179dSJan Kara { 2364884d179dSJan Kara struct dquot *dquot; 2365884d179dSJan Kara 2366884d179dSJan Kara dquot = dqget(sb, id, type); 2367dd6f3c6dSJan Kara if (!dquot) 2368884d179dSJan Kara return -ESRCH; 2369884d179dSJan Kara do_get_dqblk(dquot, di); 2370884d179dSJan Kara dqput(dquot); 2371884d179dSJan Kara 2372884d179dSJan Kara return 0; 2373884d179dSJan Kara } 2374287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_get_dqblk); 2375884d179dSJan Kara 2376c472b432SChristoph Hellwig #define VFS_FS_DQ_MASK \ 2377c472b432SChristoph Hellwig (FS_DQ_BCOUNT | FS_DQ_BSOFT | FS_DQ_BHARD | \ 2378c472b432SChristoph Hellwig FS_DQ_ICOUNT | FS_DQ_ISOFT | FS_DQ_IHARD | \ 2379c472b432SChristoph Hellwig FS_DQ_BTIMER | FS_DQ_ITIMER) 2380c472b432SChristoph Hellwig 2381884d179dSJan Kara /* Generic routine for setting common part of quota structure */ 2382c472b432SChristoph Hellwig static int do_set_dqblk(struct dquot *dquot, struct fs_disk_quota *di) 2383884d179dSJan Kara { 2384884d179dSJan Kara struct mem_dqblk *dm = &dquot->dq_dqb; 2385884d179dSJan Kara int check_blim = 0, check_ilim = 0; 2386884d179dSJan Kara struct mem_dqinfo *dqi = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_type]; 2387884d179dSJan Kara 2388c472b432SChristoph Hellwig if (di->d_fieldmask & ~VFS_FS_DQ_MASK) 2389c472b432SChristoph Hellwig return -EINVAL; 2390c472b432SChristoph Hellwig 2391c472b432SChristoph Hellwig if (((di->d_fieldmask & FS_DQ_BSOFT) && 2392c472b432SChristoph Hellwig (di->d_blk_softlimit > dqi->dqi_maxblimit)) || 2393c472b432SChristoph Hellwig ((di->d_fieldmask & FS_DQ_BHARD) && 2394c472b432SChristoph Hellwig (di->d_blk_hardlimit > dqi->dqi_maxblimit)) || 2395c472b432SChristoph Hellwig ((di->d_fieldmask & FS_DQ_ISOFT) && 2396c472b432SChristoph Hellwig (di->d_ino_softlimit > dqi->dqi_maxilimit)) || 2397c472b432SChristoph Hellwig ((di->d_fieldmask & FS_DQ_IHARD) && 2398c472b432SChristoph Hellwig (di->d_ino_hardlimit > dqi->dqi_maxilimit))) 2399884d179dSJan Kara return -ERANGE; 2400884d179dSJan Kara 2401884d179dSJan Kara spin_lock(&dq_data_lock); 2402c472b432SChristoph Hellwig if (di->d_fieldmask & FS_DQ_BCOUNT) { 2403c472b432SChristoph Hellwig dm->dqb_curspace = di->d_bcount - dm->dqb_rsvspace; 2404884d179dSJan Kara check_blim = 1; 240508261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags); 2406884d179dSJan Kara } 2407c472b432SChristoph Hellwig 2408c472b432SChristoph Hellwig if (di->d_fieldmask & FS_DQ_BSOFT) 2409c472b432SChristoph Hellwig dm->dqb_bsoftlimit = qbtos(di->d_blk_softlimit); 2410c472b432SChristoph Hellwig if (di->d_fieldmask & FS_DQ_BHARD) 2411c472b432SChristoph Hellwig dm->dqb_bhardlimit = qbtos(di->d_blk_hardlimit); 2412c472b432SChristoph Hellwig if (di->d_fieldmask & (FS_DQ_BSOFT | FS_DQ_BHARD)) { 2413884d179dSJan Kara check_blim = 1; 241408261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags); 2415884d179dSJan Kara } 2416c472b432SChristoph Hellwig 2417c472b432SChristoph Hellwig if (di->d_fieldmask & FS_DQ_ICOUNT) { 2418c472b432SChristoph Hellwig dm->dqb_curinodes = di->d_icount; 2419884d179dSJan Kara check_ilim = 1; 242008261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags); 2421884d179dSJan Kara } 2422c472b432SChristoph Hellwig 2423c472b432SChristoph Hellwig if (di->d_fieldmask & FS_DQ_ISOFT) 2424c472b432SChristoph Hellwig dm->dqb_isoftlimit = di->d_ino_softlimit; 2425c472b432SChristoph Hellwig if (di->d_fieldmask & FS_DQ_IHARD) 2426c472b432SChristoph Hellwig dm->dqb_ihardlimit = di->d_ino_hardlimit; 2427c472b432SChristoph Hellwig if (di->d_fieldmask & (FS_DQ_ISOFT | FS_DQ_IHARD)) { 2428884d179dSJan Kara check_ilim = 1; 242908261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags); 2430884d179dSJan Kara } 2431c472b432SChristoph Hellwig 2432c472b432SChristoph Hellwig if (di->d_fieldmask & FS_DQ_BTIMER) { 2433c472b432SChristoph Hellwig dm->dqb_btime = di->d_btimer; 2434884d179dSJan Kara check_blim = 1; 243508261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags); 2436884d179dSJan Kara } 2437c472b432SChristoph Hellwig 2438c472b432SChristoph Hellwig if (di->d_fieldmask & FS_DQ_ITIMER) { 2439c472b432SChristoph Hellwig dm->dqb_itime = di->d_itimer; 2440884d179dSJan Kara check_ilim = 1; 244108261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags); 2442884d179dSJan Kara } 2443884d179dSJan Kara 2444884d179dSJan Kara if (check_blim) { 2445268157baSJan Kara if (!dm->dqb_bsoftlimit || 2446268157baSJan Kara dm->dqb_curspace < dm->dqb_bsoftlimit) { 2447884d179dSJan Kara dm->dqb_btime = 0; 2448884d179dSJan Kara clear_bit(DQ_BLKS_B, &dquot->dq_flags); 2449c472b432SChristoph Hellwig } else if (!(di->d_fieldmask & FS_DQ_BTIMER)) 2450268157baSJan Kara /* Set grace only if user hasn't provided his own... */ 2451884d179dSJan Kara dm->dqb_btime = get_seconds() + dqi->dqi_bgrace; 2452884d179dSJan Kara } 2453884d179dSJan Kara if (check_ilim) { 2454268157baSJan Kara if (!dm->dqb_isoftlimit || 2455268157baSJan Kara dm->dqb_curinodes < dm->dqb_isoftlimit) { 2456884d179dSJan Kara dm->dqb_itime = 0; 2457884d179dSJan Kara clear_bit(DQ_INODES_B, &dquot->dq_flags); 2458c472b432SChristoph Hellwig } else if (!(di->d_fieldmask & FS_DQ_ITIMER)) 2459268157baSJan Kara /* Set grace only if user hasn't provided his own... */ 2460884d179dSJan Kara dm->dqb_itime = get_seconds() + dqi->dqi_igrace; 2461884d179dSJan Kara } 2462268157baSJan Kara if (dm->dqb_bhardlimit || dm->dqb_bsoftlimit || dm->dqb_ihardlimit || 2463268157baSJan Kara dm->dqb_isoftlimit) 2464884d179dSJan Kara clear_bit(DQ_FAKE_B, &dquot->dq_flags); 2465884d179dSJan Kara else 2466884d179dSJan Kara set_bit(DQ_FAKE_B, &dquot->dq_flags); 2467884d179dSJan Kara spin_unlock(&dq_data_lock); 2468884d179dSJan Kara mark_dquot_dirty(dquot); 2469884d179dSJan Kara 2470884d179dSJan Kara return 0; 2471884d179dSJan Kara } 2472884d179dSJan Kara 2473287a8095SChristoph Hellwig int dquot_set_dqblk(struct super_block *sb, int type, qid_t id, 2474c472b432SChristoph Hellwig struct fs_disk_quota *di) 2475884d179dSJan Kara { 2476884d179dSJan Kara struct dquot *dquot; 2477884d179dSJan Kara int rc; 2478884d179dSJan Kara 2479884d179dSJan Kara dquot = dqget(sb, id, type); 2480884d179dSJan Kara if (!dquot) { 2481884d179dSJan Kara rc = -ESRCH; 2482884d179dSJan Kara goto out; 2483884d179dSJan Kara } 2484884d179dSJan Kara rc = do_set_dqblk(dquot, di); 2485884d179dSJan Kara dqput(dquot); 2486884d179dSJan Kara out: 2487884d179dSJan Kara return rc; 2488884d179dSJan Kara } 2489287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_set_dqblk); 2490884d179dSJan Kara 2491884d179dSJan Kara /* Generic routine for getting common part of quota file information */ 2492287a8095SChristoph Hellwig int dquot_get_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii) 2493884d179dSJan Kara { 2494884d179dSJan Kara struct mem_dqinfo *mi; 2495884d179dSJan Kara 2496884d179dSJan Kara mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); 2497884d179dSJan Kara if (!sb_has_quota_active(sb, type)) { 2498884d179dSJan Kara mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); 2499884d179dSJan Kara return -ESRCH; 2500884d179dSJan Kara } 2501884d179dSJan Kara mi = sb_dqopt(sb)->info + type; 2502884d179dSJan Kara spin_lock(&dq_data_lock); 2503884d179dSJan Kara ii->dqi_bgrace = mi->dqi_bgrace; 2504884d179dSJan Kara ii->dqi_igrace = mi->dqi_igrace; 250546fe44ceSJan Kara ii->dqi_flags = mi->dqi_flags & DQF_GETINFO_MASK; 2506884d179dSJan Kara ii->dqi_valid = IIF_ALL; 2507884d179dSJan Kara spin_unlock(&dq_data_lock); 2508884d179dSJan Kara mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); 2509884d179dSJan Kara return 0; 2510884d179dSJan Kara } 2511287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_get_dqinfo); 2512884d179dSJan Kara 2513884d179dSJan Kara /* Generic routine for setting common part of quota file information */ 2514287a8095SChristoph Hellwig int dquot_set_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii) 2515884d179dSJan Kara { 2516884d179dSJan Kara struct mem_dqinfo *mi; 2517884d179dSJan Kara int err = 0; 2518884d179dSJan Kara 2519884d179dSJan Kara mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); 2520884d179dSJan Kara if (!sb_has_quota_active(sb, type)) { 2521884d179dSJan Kara err = -ESRCH; 2522884d179dSJan Kara goto out; 2523884d179dSJan Kara } 2524884d179dSJan Kara mi = sb_dqopt(sb)->info + type; 2525884d179dSJan Kara spin_lock(&dq_data_lock); 2526884d179dSJan Kara if (ii->dqi_valid & IIF_BGRACE) 2527884d179dSJan Kara mi->dqi_bgrace = ii->dqi_bgrace; 2528884d179dSJan Kara if (ii->dqi_valid & IIF_IGRACE) 2529884d179dSJan Kara mi->dqi_igrace = ii->dqi_igrace; 2530884d179dSJan Kara if (ii->dqi_valid & IIF_FLAGS) 253146fe44ceSJan Kara mi->dqi_flags = (mi->dqi_flags & ~DQF_SETINFO_MASK) | 253246fe44ceSJan Kara (ii->dqi_flags & DQF_SETINFO_MASK); 2533884d179dSJan Kara spin_unlock(&dq_data_lock); 2534884d179dSJan Kara mark_info_dirty(sb, type); 2535884d179dSJan Kara /* Force write to disk */ 2536884d179dSJan Kara sb->dq_op->write_info(sb, type); 2537884d179dSJan Kara out: 2538884d179dSJan Kara mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); 2539884d179dSJan Kara return err; 2540884d179dSJan Kara } 2541287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_set_dqinfo); 2542884d179dSJan Kara 2543287a8095SChristoph Hellwig const struct quotactl_ops dquot_quotactl_ops = { 2544287a8095SChristoph Hellwig .quota_on = dquot_quota_on, 2545287a8095SChristoph Hellwig .quota_off = dquot_quota_off, 2546287a8095SChristoph Hellwig .quota_sync = dquot_quota_sync, 2547287a8095SChristoph Hellwig .get_info = dquot_get_dqinfo, 2548287a8095SChristoph Hellwig .set_info = dquot_set_dqinfo, 2549287a8095SChristoph Hellwig .get_dqblk = dquot_get_dqblk, 2550287a8095SChristoph Hellwig .set_dqblk = dquot_set_dqblk 2551884d179dSJan Kara }; 2552287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_quotactl_ops); 2553dde95888SDmitry Monakhov 2554dde95888SDmitry Monakhov static int do_proc_dqstats(struct ctl_table *table, int write, 2555dde95888SDmitry Monakhov void __user *buffer, size_t *lenp, loff_t *ppos) 2556dde95888SDmitry Monakhov { 2557dde95888SDmitry Monakhov unsigned int type = (int *)table->data - dqstats.stat; 2558f32764bdSDmitry Monakhov 2559f32764bdSDmitry Monakhov /* Update global table */ 2560f32764bdSDmitry Monakhov dqstats.stat[type] = 2561f32764bdSDmitry Monakhov percpu_counter_sum_positive(&dqstats.counter[type]); 2562dde95888SDmitry Monakhov return proc_dointvec(table, write, buffer, lenp, ppos); 2563dde95888SDmitry Monakhov } 2564dde95888SDmitry Monakhov 2565884d179dSJan Kara static ctl_table fs_dqstats_table[] = { 2566884d179dSJan Kara { 2567884d179dSJan Kara .procname = "lookups", 2568dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_LOOKUPS], 2569884d179dSJan Kara .maxlen = sizeof(int), 2570884d179dSJan Kara .mode = 0444, 2571dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2572884d179dSJan Kara }, 2573884d179dSJan Kara { 2574884d179dSJan Kara .procname = "drops", 2575dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_DROPS], 2576884d179dSJan Kara .maxlen = sizeof(int), 2577884d179dSJan Kara .mode = 0444, 2578dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2579884d179dSJan Kara }, 2580884d179dSJan Kara { 2581884d179dSJan Kara .procname = "reads", 2582dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_READS], 2583884d179dSJan Kara .maxlen = sizeof(int), 2584884d179dSJan Kara .mode = 0444, 2585dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2586884d179dSJan Kara }, 2587884d179dSJan Kara { 2588884d179dSJan Kara .procname = "writes", 2589dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_WRITES], 2590884d179dSJan Kara .maxlen = sizeof(int), 2591884d179dSJan Kara .mode = 0444, 2592dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2593884d179dSJan Kara }, 2594884d179dSJan Kara { 2595884d179dSJan Kara .procname = "cache_hits", 2596dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_CACHE_HITS], 2597884d179dSJan Kara .maxlen = sizeof(int), 2598884d179dSJan Kara .mode = 0444, 2599dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2600884d179dSJan Kara }, 2601884d179dSJan Kara { 2602884d179dSJan Kara .procname = "allocated_dquots", 2603dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_ALLOC_DQUOTS], 2604884d179dSJan Kara .maxlen = sizeof(int), 2605884d179dSJan Kara .mode = 0444, 2606dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2607884d179dSJan Kara }, 2608884d179dSJan Kara { 2609884d179dSJan Kara .procname = "free_dquots", 2610dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_FREE_DQUOTS], 2611884d179dSJan Kara .maxlen = sizeof(int), 2612884d179dSJan Kara .mode = 0444, 2613dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2614884d179dSJan Kara }, 2615884d179dSJan Kara { 2616884d179dSJan Kara .procname = "syncs", 2617dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_SYNCS], 2618884d179dSJan Kara .maxlen = sizeof(int), 2619884d179dSJan Kara .mode = 0444, 2620dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2621884d179dSJan Kara }, 2622884d179dSJan Kara #ifdef CONFIG_PRINT_QUOTA_WARNING 2623884d179dSJan Kara { 2624884d179dSJan Kara .procname = "warnings", 2625884d179dSJan Kara .data = &flag_print_warnings, 2626884d179dSJan Kara .maxlen = sizeof(int), 2627884d179dSJan Kara .mode = 0644, 26286d456111SEric W. Biederman .proc_handler = proc_dointvec, 2629884d179dSJan Kara }, 2630884d179dSJan Kara #endif 2631ab09203eSEric W. Biederman { }, 2632884d179dSJan Kara }; 2633884d179dSJan Kara 2634884d179dSJan Kara static ctl_table fs_table[] = { 2635884d179dSJan Kara { 2636884d179dSJan Kara .procname = "quota", 2637884d179dSJan Kara .mode = 0555, 2638884d179dSJan Kara .child = fs_dqstats_table, 2639884d179dSJan Kara }, 2640ab09203eSEric W. Biederman { }, 2641884d179dSJan Kara }; 2642884d179dSJan Kara 2643884d179dSJan Kara static ctl_table sys_table[] = { 2644884d179dSJan Kara { 2645884d179dSJan Kara .procname = "fs", 2646884d179dSJan Kara .mode = 0555, 2647884d179dSJan Kara .child = fs_table, 2648884d179dSJan Kara }, 2649ab09203eSEric W. Biederman { }, 2650884d179dSJan Kara }; 2651884d179dSJan Kara 2652884d179dSJan Kara static int __init dquot_init(void) 2653884d179dSJan Kara { 2654f32764bdSDmitry Monakhov int i, ret; 2655884d179dSJan Kara unsigned long nr_hash, order; 2656884d179dSJan Kara 2657884d179dSJan Kara printk(KERN_NOTICE "VFS: Disk quotas %s\n", __DQUOT_VERSION__); 2658884d179dSJan Kara 2659884d179dSJan Kara register_sysctl_table(sys_table); 2660884d179dSJan Kara 2661884d179dSJan Kara dquot_cachep = kmem_cache_create("dquot", 2662884d179dSJan Kara sizeof(struct dquot), sizeof(unsigned long) * 4, 2663884d179dSJan Kara (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| 2664884d179dSJan Kara SLAB_MEM_SPREAD|SLAB_PANIC), 2665884d179dSJan Kara NULL); 2666884d179dSJan Kara 2667884d179dSJan Kara order = 0; 2668884d179dSJan Kara dquot_hash = (struct hlist_head *)__get_free_pages(GFP_ATOMIC, order); 2669884d179dSJan Kara if (!dquot_hash) 2670884d179dSJan Kara panic("Cannot create dquot hash table"); 2671884d179dSJan Kara 2672f32764bdSDmitry Monakhov for (i = 0; i < _DQST_DQSTAT_LAST; i++) { 2673f32764bdSDmitry Monakhov ret = percpu_counter_init(&dqstats.counter[i], 0); 2674f32764bdSDmitry Monakhov if (ret) 2675f32764bdSDmitry Monakhov panic("Cannot create dquot stat counters"); 2676f32764bdSDmitry Monakhov } 2677dde95888SDmitry Monakhov 2678884d179dSJan Kara /* Find power-of-two hlist_heads which can fit into allocation */ 2679884d179dSJan Kara nr_hash = (1UL << order) * PAGE_SIZE / sizeof(struct hlist_head); 2680884d179dSJan Kara dq_hash_bits = 0; 2681884d179dSJan Kara do { 2682884d179dSJan Kara dq_hash_bits++; 2683884d179dSJan Kara } while (nr_hash >> dq_hash_bits); 2684884d179dSJan Kara dq_hash_bits--; 2685884d179dSJan Kara 2686884d179dSJan Kara nr_hash = 1UL << dq_hash_bits; 2687884d179dSJan Kara dq_hash_mask = nr_hash - 1; 2688884d179dSJan Kara for (i = 0; i < nr_hash; i++) 2689884d179dSJan Kara INIT_HLIST_HEAD(dquot_hash + i); 2690884d179dSJan Kara 2691884d179dSJan Kara printk("Dquot-cache hash table entries: %ld (order %ld, %ld bytes)\n", 2692884d179dSJan Kara nr_hash, order, (PAGE_SIZE << order)); 2693884d179dSJan Kara 2694884d179dSJan Kara register_shrinker(&dqcache_shrinker); 2695884d179dSJan Kara 2696884d179dSJan Kara return 0; 2697884d179dSJan Kara } 2698884d179dSJan Kara module_init(dquot_init); 2699