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> 755b825c3aSIngo Molnar #include <linux/cred.h> 76884d179dSJan Kara #include <linux/kmod.h> 77884d179dSJan Kara #include <linux/namei.h> 78884d179dSJan Kara #include <linux/capability.h> 79884d179dSJan Kara #include <linux/quotaops.h> 8055fa6091SDave Chinner #include "../internal.h" /* ugh */ 81884d179dSJan Kara 82f3da9310SJeff Liu #include <linux/uaccess.h> 83884d179dSJan Kara 84884d179dSJan Kara /* 85884d179dSJan Kara * There are three quota SMP locks. dq_list_lock protects all lists with quotas 86dde95888SDmitry Monakhov * and quota formats. 87884d179dSJan Kara * dq_data_lock protects data from dq_dqb and also mem_dqinfo structures and 88884d179dSJan Kara * also guards consistency of dquot->dq_dqb with inode->i_blocks, i_bytes. 89884d179dSJan Kara * i_blocks and i_bytes updates itself are guarded by i_lock acquired directly 90884d179dSJan Kara * in inode_add_bytes() and inode_sub_bytes(). dq_state_lock protects 91884d179dSJan Kara * modifications of quota state (on quotaon and quotaoff) and readers who care 92884d179dSJan Kara * about latest values take it as well. 93884d179dSJan Kara * 94884d179dSJan Kara * The spinlock ordering is hence: dq_data_lock > dq_list_lock > i_lock, 95884d179dSJan Kara * dq_list_lock > dq_state_lock 96884d179dSJan Kara * 97884d179dSJan Kara * Note that some things (eg. sb pointer, type, id) doesn't change during 98884d179dSJan Kara * the life of the dquot structure and so needn't to be protected by a lock 99884d179dSJan Kara * 100b9ba6f94SNiu Yawei * Operation accessing dquots via inode pointers are protected by dquot_srcu. 101b9ba6f94SNiu Yawei * Operation of reading pointer needs srcu_read_lock(&dquot_srcu), and 102b9ba6f94SNiu Yawei * synchronize_srcu(&dquot_srcu) is called after clearing pointers from 103b9ba6f94SNiu Yawei * inode and before dropping dquot references to avoid use of dquots after 104b9ba6f94SNiu Yawei * they are freed. dq_data_lock is used to serialize the pointer setting and 105b9ba6f94SNiu Yawei * clearing operations. 10626245c94SJan Kara * Special care needs to be taken about S_NOQUOTA inode flag (marking that 10726245c94SJan Kara * inode is a quota file). Functions adding pointers from inode to dquots have 108b9ba6f94SNiu Yawei * to check this flag under dq_data_lock and then (if S_NOQUOTA is not set) they 109b9ba6f94SNiu Yawei * have to do all pointer modifications before dropping dq_data_lock. This makes 11026245c94SJan Kara * sure they cannot race with quotaon which first sets S_NOQUOTA flag and 11126245c94SJan Kara * then drops all pointers to dquots from an inode. 112884d179dSJan Kara * 113884d179dSJan Kara * Each dquot has its dq_lock mutex. Locked dquots might not be referenced 114884d179dSJan Kara * from inodes (dquot_alloc_space() and such don't check the dq_lock). 115884d179dSJan Kara * Currently dquot is locked only when it is being read to memory (or space for 116884d179dSJan Kara * it is being allocated) on the first dqget() and when it is being released on 117884d179dSJan Kara * the last dqput(). The allocation and release oparations are serialized by 118884d179dSJan Kara * the dq_lock and by checking the use count in dquot_release(). Write 119884d179dSJan Kara * operations on dquots don't hold dq_lock as they copy data under dq_data_lock 120884d179dSJan Kara * spinlock to internal buffers before writing. 121884d179dSJan Kara * 122884d179dSJan Kara * Lock ordering (including related VFS locks) is the following: 123bc8230eeSJan Kara * s_umount > i_mutex > journal_lock > dquot->dq_lock > dqio_sem 124884d179dSJan Kara */ 125884d179dSJan Kara 126c516610cSJan Kara static __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_list_lock); 127c516610cSJan Kara static __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_state_lock); 128c516610cSJan Kara __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_data_lock); 129884d179dSJan Kara EXPORT_SYMBOL(dq_data_lock); 130b9ba6f94SNiu Yawei DEFINE_STATIC_SRCU(dquot_srcu); 131884d179dSJan Kara 132fb5ffb0eSJiaying Zhang void __quota_error(struct super_block *sb, const char *func, 133fb5ffb0eSJiaying Zhang const char *fmt, ...) 134fb5ffb0eSJiaying Zhang { 135fb5ffb0eSJiaying Zhang if (printk_ratelimit()) { 136055adcbdSJoe Perches va_list args; 137055adcbdSJoe Perches struct va_format vaf; 138055adcbdSJoe Perches 139fb5ffb0eSJiaying Zhang va_start(args, fmt); 140055adcbdSJoe Perches 141055adcbdSJoe Perches vaf.fmt = fmt; 142055adcbdSJoe Perches vaf.va = &args; 143055adcbdSJoe Perches 144055adcbdSJoe Perches printk(KERN_ERR "Quota error (device %s): %s: %pV\n", 145055adcbdSJoe Perches sb->s_id, func, &vaf); 146055adcbdSJoe Perches 147fb5ffb0eSJiaying Zhang va_end(args); 148fb5ffb0eSJiaying Zhang } 149fb5ffb0eSJiaying Zhang } 150fb5ffb0eSJiaying Zhang EXPORT_SYMBOL(__quota_error); 151fb5ffb0eSJiaying Zhang 152da8d1ba2SSergey Senozhatsky #if defined(CONFIG_QUOTA_DEBUG) || defined(CONFIG_PRINT_QUOTA_WARNING) 153884d179dSJan Kara static char *quotatypes[] = INITQFNAMES; 154da8d1ba2SSergey Senozhatsky #endif 155884d179dSJan Kara static struct quota_format_type *quota_formats; /* List of registered formats */ 156884d179dSJan Kara static struct quota_module_name module_names[] = INIT_QUOTA_MODULE_NAMES; 157884d179dSJan Kara 158884d179dSJan Kara /* SLAB cache for dquot structures */ 159884d179dSJan Kara static struct kmem_cache *dquot_cachep; 160884d179dSJan Kara 161884d179dSJan Kara int register_quota_format(struct quota_format_type *fmt) 162884d179dSJan Kara { 163884d179dSJan Kara spin_lock(&dq_list_lock); 164884d179dSJan Kara fmt->qf_next = quota_formats; 165884d179dSJan Kara quota_formats = fmt; 166884d179dSJan Kara spin_unlock(&dq_list_lock); 167884d179dSJan Kara return 0; 168884d179dSJan Kara } 169884d179dSJan Kara EXPORT_SYMBOL(register_quota_format); 170884d179dSJan Kara 171884d179dSJan Kara void unregister_quota_format(struct quota_format_type *fmt) 172884d179dSJan Kara { 173884d179dSJan Kara struct quota_format_type **actqf; 174884d179dSJan Kara 175884d179dSJan Kara spin_lock(&dq_list_lock); 176268157baSJan Kara for (actqf = "a_formats; *actqf && *actqf != fmt; 177268157baSJan Kara actqf = &(*actqf)->qf_next) 178268157baSJan Kara ; 179884d179dSJan Kara if (*actqf) 180884d179dSJan Kara *actqf = (*actqf)->qf_next; 181884d179dSJan Kara spin_unlock(&dq_list_lock); 182884d179dSJan Kara } 183884d179dSJan Kara EXPORT_SYMBOL(unregister_quota_format); 184884d179dSJan Kara 185884d179dSJan Kara static struct quota_format_type *find_quota_format(int id) 186884d179dSJan Kara { 187884d179dSJan Kara struct quota_format_type *actqf; 188884d179dSJan Kara 189884d179dSJan Kara spin_lock(&dq_list_lock); 190268157baSJan Kara for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id; 191268157baSJan Kara actqf = actqf->qf_next) 192268157baSJan Kara ; 193884d179dSJan Kara if (!actqf || !try_module_get(actqf->qf_owner)) { 194884d179dSJan Kara int qm; 195884d179dSJan Kara 196884d179dSJan Kara spin_unlock(&dq_list_lock); 197884d179dSJan Kara 198268157baSJan Kara for (qm = 0; module_names[qm].qm_fmt_id && 199268157baSJan Kara module_names[qm].qm_fmt_id != id; qm++) 200268157baSJan Kara ; 201268157baSJan Kara if (!module_names[qm].qm_fmt_id || 202268157baSJan Kara request_module(module_names[qm].qm_mod_name)) 203884d179dSJan Kara return NULL; 204884d179dSJan Kara 205884d179dSJan Kara spin_lock(&dq_list_lock); 206268157baSJan Kara for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id; 207268157baSJan Kara actqf = actqf->qf_next) 208268157baSJan Kara ; 209884d179dSJan Kara if (actqf && !try_module_get(actqf->qf_owner)) 210884d179dSJan Kara actqf = NULL; 211884d179dSJan Kara } 212884d179dSJan Kara spin_unlock(&dq_list_lock); 213884d179dSJan Kara return actqf; 214884d179dSJan Kara } 215884d179dSJan Kara 216884d179dSJan Kara static void put_quota_format(struct quota_format_type *fmt) 217884d179dSJan Kara { 218884d179dSJan Kara module_put(fmt->qf_owner); 219884d179dSJan Kara } 220884d179dSJan Kara 221884d179dSJan Kara /* 222884d179dSJan Kara * Dquot List Management: 223884d179dSJan Kara * The quota code uses three lists for dquot management: the inuse_list, 224884d179dSJan Kara * free_dquots, and dquot_hash[] array. A single dquot structure may be 225884d179dSJan Kara * on all three lists, depending on its current state. 226884d179dSJan Kara * 227884d179dSJan Kara * All dquots are placed to the end of inuse_list when first created, and this 228884d179dSJan Kara * list is used for invalidate operation, which must look at every dquot. 229884d179dSJan Kara * 230884d179dSJan Kara * Unused dquots (dq_count == 0) are added to the free_dquots list when freed, 231884d179dSJan Kara * and this list is searched whenever we need an available dquot. Dquots are 232884d179dSJan Kara * removed from the list as soon as they are used again, and 233884d179dSJan Kara * dqstats.free_dquots gives the number of dquots on the list. When 234884d179dSJan Kara * dquot is invalidated it's completely released from memory. 235884d179dSJan Kara * 236884d179dSJan Kara * Dquots with a specific identity (device, type and id) are placed on 237884d179dSJan Kara * one of the dquot_hash[] hash chains. The provides an efficient search 238884d179dSJan Kara * mechanism to locate a specific dquot. 239884d179dSJan Kara */ 240884d179dSJan Kara 241884d179dSJan Kara static LIST_HEAD(inuse_list); 242884d179dSJan Kara static LIST_HEAD(free_dquots); 243884d179dSJan Kara static unsigned int dq_hash_bits, dq_hash_mask; 244884d179dSJan Kara static struct hlist_head *dquot_hash; 245884d179dSJan Kara 246884d179dSJan Kara struct dqstats dqstats; 247884d179dSJan Kara EXPORT_SYMBOL(dqstats); 248884d179dSJan Kara 2490a5a9c72SJan Kara static qsize_t inode_get_rsv_space(struct inode *inode); 2506184fc0bSJan Kara static int __dquot_initialize(struct inode *inode, int type); 2510a5a9c72SJan Kara 252884d179dSJan Kara static inline unsigned int 2531a06d420SEric W. Biederman hashfn(const struct super_block *sb, struct kqid qid) 254884d179dSJan Kara { 2551a06d420SEric W. Biederman unsigned int id = from_kqid(&init_user_ns, qid); 2561a06d420SEric W. Biederman int type = qid.type; 257884d179dSJan Kara unsigned long tmp; 258884d179dSJan Kara 259884d179dSJan Kara tmp = (((unsigned long)sb>>L1_CACHE_SHIFT) ^ id) * (MAXQUOTAS - type); 260884d179dSJan Kara return (tmp + (tmp >> dq_hash_bits)) & dq_hash_mask; 261884d179dSJan Kara } 262884d179dSJan Kara 263884d179dSJan Kara /* 264884d179dSJan Kara * Following list functions expect dq_list_lock to be held 265884d179dSJan Kara */ 266884d179dSJan Kara static inline void insert_dquot_hash(struct dquot *dquot) 267884d179dSJan Kara { 268268157baSJan Kara struct hlist_head *head; 2691a06d420SEric W. Biederman head = dquot_hash + hashfn(dquot->dq_sb, dquot->dq_id); 270884d179dSJan Kara hlist_add_head(&dquot->dq_hash, head); 271884d179dSJan Kara } 272884d179dSJan Kara 273884d179dSJan Kara static inline void remove_dquot_hash(struct dquot *dquot) 274884d179dSJan Kara { 275884d179dSJan Kara hlist_del_init(&dquot->dq_hash); 276884d179dSJan Kara } 277884d179dSJan Kara 2787a2435d8SJan Kara static struct dquot *find_dquot(unsigned int hashent, struct super_block *sb, 2791a06d420SEric W. Biederman struct kqid qid) 280884d179dSJan Kara { 281884d179dSJan Kara struct hlist_node *node; 282884d179dSJan Kara struct dquot *dquot; 283884d179dSJan Kara 284884d179dSJan Kara hlist_for_each (node, dquot_hash+hashent) { 285884d179dSJan Kara dquot = hlist_entry(node, struct dquot, dq_hash); 2864c376dcaSEric W. Biederman if (dquot->dq_sb == sb && qid_eq(dquot->dq_id, qid)) 287884d179dSJan Kara return dquot; 288884d179dSJan Kara } 289dd6f3c6dSJan Kara return NULL; 290884d179dSJan Kara } 291884d179dSJan Kara 292884d179dSJan Kara /* Add a dquot to the tail of the free list */ 293884d179dSJan Kara static inline void put_dquot_last(struct dquot *dquot) 294884d179dSJan Kara { 295884d179dSJan Kara list_add_tail(&dquot->dq_free, &free_dquots); 296dde95888SDmitry Monakhov dqstats_inc(DQST_FREE_DQUOTS); 297884d179dSJan Kara } 298884d179dSJan Kara 299884d179dSJan Kara static inline void remove_free_dquot(struct dquot *dquot) 300884d179dSJan Kara { 301884d179dSJan Kara if (list_empty(&dquot->dq_free)) 302884d179dSJan Kara return; 303884d179dSJan Kara list_del_init(&dquot->dq_free); 304dde95888SDmitry Monakhov dqstats_dec(DQST_FREE_DQUOTS); 305884d179dSJan Kara } 306884d179dSJan Kara 307884d179dSJan Kara static inline void put_inuse(struct dquot *dquot) 308884d179dSJan Kara { 309884d179dSJan Kara /* We add to the back of inuse list so we don't have to restart 310884d179dSJan Kara * when traversing this list and we block */ 311884d179dSJan Kara list_add_tail(&dquot->dq_inuse, &inuse_list); 312dde95888SDmitry Monakhov dqstats_inc(DQST_ALLOC_DQUOTS); 313884d179dSJan Kara } 314884d179dSJan Kara 315884d179dSJan Kara static inline void remove_inuse(struct dquot *dquot) 316884d179dSJan Kara { 317dde95888SDmitry Monakhov dqstats_dec(DQST_ALLOC_DQUOTS); 318884d179dSJan Kara list_del(&dquot->dq_inuse); 319884d179dSJan Kara } 320884d179dSJan Kara /* 321884d179dSJan Kara * End of list functions needing dq_list_lock 322884d179dSJan Kara */ 323884d179dSJan Kara 324884d179dSJan Kara static void wait_on_dquot(struct dquot *dquot) 325884d179dSJan Kara { 326884d179dSJan Kara mutex_lock(&dquot->dq_lock); 327884d179dSJan Kara mutex_unlock(&dquot->dq_lock); 328884d179dSJan Kara } 329884d179dSJan Kara 330884d179dSJan Kara static inline int dquot_dirty(struct dquot *dquot) 331884d179dSJan Kara { 332884d179dSJan Kara return test_bit(DQ_MOD_B, &dquot->dq_flags); 333884d179dSJan Kara } 334884d179dSJan Kara 335884d179dSJan Kara static inline int mark_dquot_dirty(struct dquot *dquot) 336884d179dSJan Kara { 337884d179dSJan Kara return dquot->dq_sb->dq_op->mark_dirty(dquot); 338884d179dSJan Kara } 339884d179dSJan Kara 340eabf290dSDmitry Monakhov /* Mark dquot dirty in atomic manner, and return it's old dirty flag state */ 341884d179dSJan Kara int dquot_mark_dquot_dirty(struct dquot *dquot) 342884d179dSJan Kara { 343eabf290dSDmitry Monakhov int ret = 1; 344eabf290dSDmitry Monakhov 345eabf290dSDmitry Monakhov /* If quota is dirty already, we don't have to acquire dq_list_lock */ 346eabf290dSDmitry Monakhov if (test_bit(DQ_MOD_B, &dquot->dq_flags)) 347eabf290dSDmitry Monakhov return 1; 348eabf290dSDmitry Monakhov 349884d179dSJan Kara spin_lock(&dq_list_lock); 350eabf290dSDmitry Monakhov if (!test_and_set_bit(DQ_MOD_B, &dquot->dq_flags)) { 351884d179dSJan Kara list_add(&dquot->dq_dirty, &sb_dqopt(dquot->dq_sb)-> 3524c376dcaSEric W. Biederman info[dquot->dq_id.type].dqi_dirty_list); 353eabf290dSDmitry Monakhov ret = 0; 354eabf290dSDmitry Monakhov } 355884d179dSJan Kara spin_unlock(&dq_list_lock); 356eabf290dSDmitry Monakhov return ret; 357884d179dSJan Kara } 358884d179dSJan Kara EXPORT_SYMBOL(dquot_mark_dquot_dirty); 359884d179dSJan Kara 360dc52dd3aSDmitry Monakhov /* Dirtify all the dquots - this can block when journalling */ 361dc52dd3aSDmitry Monakhov static inline int mark_all_dquot_dirty(struct dquot * const *dquot) 362dc52dd3aSDmitry Monakhov { 363dc52dd3aSDmitry Monakhov int ret, err, cnt; 364dc52dd3aSDmitry Monakhov 365dc52dd3aSDmitry Monakhov ret = err = 0; 366dc52dd3aSDmitry Monakhov for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 367dc52dd3aSDmitry Monakhov if (dquot[cnt]) 368dc52dd3aSDmitry Monakhov /* Even in case of error we have to continue */ 369dc52dd3aSDmitry Monakhov ret = mark_dquot_dirty(dquot[cnt]); 370dc52dd3aSDmitry Monakhov if (!err) 371dc52dd3aSDmitry Monakhov err = ret; 372dc52dd3aSDmitry Monakhov } 373dc52dd3aSDmitry Monakhov return err; 374dc52dd3aSDmitry Monakhov } 375dc52dd3aSDmitry Monakhov 376dc52dd3aSDmitry Monakhov static inline void dqput_all(struct dquot **dquot) 377dc52dd3aSDmitry Monakhov { 378dc52dd3aSDmitry Monakhov unsigned int cnt; 379dc52dd3aSDmitry Monakhov 380dc52dd3aSDmitry Monakhov for (cnt = 0; cnt < MAXQUOTAS; cnt++) 381dc52dd3aSDmitry Monakhov dqput(dquot[cnt]); 382dc52dd3aSDmitry Monakhov } 383dc52dd3aSDmitry Monakhov 384884d179dSJan Kara /* This function needs dq_list_lock */ 385884d179dSJan Kara static inline int clear_dquot_dirty(struct dquot *dquot) 386884d179dSJan Kara { 387884d179dSJan Kara if (!test_and_clear_bit(DQ_MOD_B, &dquot->dq_flags)) 388884d179dSJan Kara return 0; 389884d179dSJan Kara list_del_init(&dquot->dq_dirty); 390884d179dSJan Kara return 1; 391884d179dSJan Kara } 392884d179dSJan Kara 393884d179dSJan Kara void mark_info_dirty(struct super_block *sb, int type) 394884d179dSJan Kara { 395884d179dSJan Kara set_bit(DQF_INFO_DIRTY_B, &sb_dqopt(sb)->info[type].dqi_flags); 396884d179dSJan Kara } 397884d179dSJan Kara EXPORT_SYMBOL(mark_info_dirty); 398884d179dSJan Kara 399884d179dSJan Kara /* 400884d179dSJan Kara * Read dquot from disk and alloc space for it 401884d179dSJan Kara */ 402884d179dSJan Kara 403884d179dSJan Kara int dquot_acquire(struct dquot *dquot) 404884d179dSJan Kara { 405884d179dSJan Kara int ret = 0, ret2 = 0; 406884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); 407884d179dSJan Kara 408884d179dSJan Kara mutex_lock(&dquot->dq_lock); 40962676838SJan Kara if (!test_bit(DQ_READ_B, &dquot->dq_flags)) { 41062676838SJan Kara down_read(&dqopt->dqio_sem); 4114c376dcaSEric W. Biederman ret = dqopt->ops[dquot->dq_id.type]->read_dqblk(dquot); 41262676838SJan Kara up_read(&dqopt->dqio_sem); 41362676838SJan Kara } 414884d179dSJan Kara if (ret < 0) 415884d179dSJan Kara goto out_iolock; 416044c9b67SJan Kara /* Make sure flags update is visible after dquot has been filled */ 417044c9b67SJan Kara smp_mb__before_atomic(); 418884d179dSJan Kara set_bit(DQ_READ_B, &dquot->dq_flags); 419884d179dSJan Kara /* Instantiate dquot if needed */ 420884d179dSJan Kara if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && !dquot->dq_off) { 42162676838SJan Kara down_write(&dqopt->dqio_sem); 4224c376dcaSEric W. Biederman ret = dqopt->ops[dquot->dq_id.type]->commit_dqblk(dquot); 423884d179dSJan Kara /* Write the info if needed */ 4244c376dcaSEric W. Biederman if (info_dirty(&dqopt->info[dquot->dq_id.type])) { 4254c376dcaSEric W. Biederman ret2 = dqopt->ops[dquot->dq_id.type]->write_file_info( 4264c376dcaSEric W. Biederman dquot->dq_sb, dquot->dq_id.type); 427268157baSJan Kara } 42862676838SJan Kara up_write(&dqopt->dqio_sem); 429884d179dSJan Kara if (ret < 0) 430884d179dSJan Kara goto out_iolock; 431884d179dSJan Kara if (ret2 < 0) { 432884d179dSJan Kara ret = ret2; 433884d179dSJan Kara goto out_iolock; 434884d179dSJan Kara } 435884d179dSJan Kara } 436044c9b67SJan Kara /* 437044c9b67SJan Kara * Make sure flags update is visible after on-disk struct has been 438044c9b67SJan Kara * allocated. Paired with smp_rmb() in dqget(). 439044c9b67SJan Kara */ 440044c9b67SJan Kara smp_mb__before_atomic(); 441884d179dSJan Kara set_bit(DQ_ACTIVE_B, &dquot->dq_flags); 442884d179dSJan Kara out_iolock: 443884d179dSJan Kara mutex_unlock(&dquot->dq_lock); 444884d179dSJan Kara return ret; 445884d179dSJan Kara } 446884d179dSJan Kara EXPORT_SYMBOL(dquot_acquire); 447884d179dSJan Kara 448884d179dSJan Kara /* 449884d179dSJan Kara * Write dquot to disk 450884d179dSJan Kara */ 451884d179dSJan Kara int dquot_commit(struct dquot *dquot) 452884d179dSJan Kara { 453b03f2456SJan Kara int ret = 0; 454884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); 455884d179dSJan Kara 456bc8230eeSJan Kara down_write(&dqopt->dqio_sem); 457884d179dSJan Kara spin_lock(&dq_list_lock); 458884d179dSJan Kara if (!clear_dquot_dirty(dquot)) { 459884d179dSJan Kara spin_unlock(&dq_list_lock); 460884d179dSJan Kara goto out_sem; 461884d179dSJan Kara } 462884d179dSJan Kara spin_unlock(&dq_list_lock); 463884d179dSJan Kara /* Inactive dquot can be only if there was error during read/init 464884d179dSJan Kara * => we have better not writing it */ 465b03f2456SJan Kara if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) 4664c376dcaSEric W. Biederman ret = dqopt->ops[dquot->dq_id.type]->commit_dqblk(dquot); 467b03f2456SJan Kara else 468b03f2456SJan Kara ret = -EIO; 469884d179dSJan Kara out_sem: 470bc8230eeSJan Kara up_write(&dqopt->dqio_sem); 471884d179dSJan Kara return ret; 472884d179dSJan Kara } 473884d179dSJan Kara EXPORT_SYMBOL(dquot_commit); 474884d179dSJan Kara 475884d179dSJan Kara /* 476884d179dSJan Kara * Release dquot 477884d179dSJan Kara */ 478884d179dSJan Kara int dquot_release(struct dquot *dquot) 479884d179dSJan Kara { 480884d179dSJan Kara int ret = 0, ret2 = 0; 481884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); 482884d179dSJan Kara 483884d179dSJan Kara mutex_lock(&dquot->dq_lock); 484884d179dSJan Kara /* Check whether we are not racing with some other dqget() */ 485884d179dSJan Kara if (atomic_read(&dquot->dq_count) > 1) 486884d179dSJan Kara goto out_dqlock; 487bc8230eeSJan Kara down_write(&dqopt->dqio_sem); 4884c376dcaSEric W. Biederman if (dqopt->ops[dquot->dq_id.type]->release_dqblk) { 4894c376dcaSEric W. Biederman ret = dqopt->ops[dquot->dq_id.type]->release_dqblk(dquot); 490884d179dSJan Kara /* Write the info */ 4914c376dcaSEric W. Biederman if (info_dirty(&dqopt->info[dquot->dq_id.type])) { 4924c376dcaSEric W. Biederman ret2 = dqopt->ops[dquot->dq_id.type]->write_file_info( 4934c376dcaSEric W. Biederman dquot->dq_sb, dquot->dq_id.type); 494268157baSJan Kara } 495884d179dSJan Kara if (ret >= 0) 496884d179dSJan Kara ret = ret2; 497884d179dSJan Kara } 498884d179dSJan Kara clear_bit(DQ_ACTIVE_B, &dquot->dq_flags); 499bc8230eeSJan Kara up_write(&dqopt->dqio_sem); 500884d179dSJan Kara out_dqlock: 501884d179dSJan Kara mutex_unlock(&dquot->dq_lock); 502884d179dSJan Kara return ret; 503884d179dSJan Kara } 504884d179dSJan Kara EXPORT_SYMBOL(dquot_release); 505884d179dSJan Kara 506884d179dSJan Kara void dquot_destroy(struct dquot *dquot) 507884d179dSJan Kara { 508884d179dSJan Kara kmem_cache_free(dquot_cachep, dquot); 509884d179dSJan Kara } 510884d179dSJan Kara EXPORT_SYMBOL(dquot_destroy); 511884d179dSJan Kara 512884d179dSJan Kara static inline void do_destroy_dquot(struct dquot *dquot) 513884d179dSJan Kara { 514884d179dSJan Kara dquot->dq_sb->dq_op->destroy_dquot(dquot); 515884d179dSJan Kara } 516884d179dSJan Kara 517884d179dSJan Kara /* Invalidate all dquots on the list. Note that this function is called after 518884d179dSJan Kara * quota is disabled and pointers from inodes removed so there cannot be new 519884d179dSJan Kara * quota users. There can still be some users of quotas due to inodes being 520884d179dSJan Kara * just deleted or pruned by prune_icache() (those are not attached to any 521884d179dSJan Kara * list) or parallel quotactl call. We have to wait for such users. 522884d179dSJan Kara */ 523884d179dSJan Kara static void invalidate_dquots(struct super_block *sb, int type) 524884d179dSJan Kara { 525884d179dSJan Kara struct dquot *dquot, *tmp; 526884d179dSJan Kara 527884d179dSJan Kara restart: 528884d179dSJan Kara spin_lock(&dq_list_lock); 529884d179dSJan Kara list_for_each_entry_safe(dquot, tmp, &inuse_list, dq_inuse) { 530884d179dSJan Kara if (dquot->dq_sb != sb) 531884d179dSJan Kara continue; 5324c376dcaSEric W. Biederman if (dquot->dq_id.type != type) 533884d179dSJan Kara continue; 534884d179dSJan Kara /* Wait for dquot users */ 535884d179dSJan Kara if (atomic_read(&dquot->dq_count)) { 536884d179dSJan Kara DEFINE_WAIT(wait); 537884d179dSJan Kara 5389f985cb6SJan Kara dqgrab(dquot); 539884d179dSJan Kara prepare_to_wait(&dquot->dq_wait_unused, &wait, 540884d179dSJan Kara TASK_UNINTERRUPTIBLE); 541884d179dSJan Kara spin_unlock(&dq_list_lock); 542884d179dSJan Kara /* Once dqput() wakes us up, we know it's time to free 543884d179dSJan Kara * the dquot. 544884d179dSJan Kara * IMPORTANT: we rely on the fact that there is always 545884d179dSJan Kara * at most one process waiting for dquot to free. 546884d179dSJan Kara * Otherwise dq_count would be > 1 and we would never 547884d179dSJan Kara * wake up. 548884d179dSJan Kara */ 549884d179dSJan Kara if (atomic_read(&dquot->dq_count) > 1) 550884d179dSJan Kara schedule(); 551884d179dSJan Kara finish_wait(&dquot->dq_wait_unused, &wait); 552884d179dSJan Kara dqput(dquot); 553884d179dSJan Kara /* At this moment dquot() need not exist (it could be 554884d179dSJan Kara * reclaimed by prune_dqcache(). Hence we must 555884d179dSJan Kara * restart. */ 556884d179dSJan Kara goto restart; 557884d179dSJan Kara } 558884d179dSJan Kara /* 559884d179dSJan Kara * Quota now has no users and it has been written on last 560884d179dSJan Kara * dqput() 561884d179dSJan Kara */ 562884d179dSJan Kara remove_dquot_hash(dquot); 563884d179dSJan Kara remove_free_dquot(dquot); 564884d179dSJan Kara remove_inuse(dquot); 565884d179dSJan Kara do_destroy_dquot(dquot); 566884d179dSJan Kara } 567884d179dSJan Kara spin_unlock(&dq_list_lock); 568884d179dSJan Kara } 569884d179dSJan Kara 570884d179dSJan Kara /* Call callback for every active dquot on given filesystem */ 571884d179dSJan Kara int dquot_scan_active(struct super_block *sb, 572884d179dSJan Kara int (*fn)(struct dquot *dquot, unsigned long priv), 573884d179dSJan Kara unsigned long priv) 574884d179dSJan Kara { 575884d179dSJan Kara struct dquot *dquot, *old_dquot = NULL; 576884d179dSJan Kara int ret = 0; 577884d179dSJan Kara 578ee1ac541SJan Kara WARN_ON_ONCE(!rwsem_is_locked(&sb->s_umount)); 579ee1ac541SJan Kara 580884d179dSJan Kara spin_lock(&dq_list_lock); 581884d179dSJan Kara list_for_each_entry(dquot, &inuse_list, dq_inuse) { 582884d179dSJan Kara if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) 583884d179dSJan Kara continue; 584884d179dSJan Kara if (dquot->dq_sb != sb) 585884d179dSJan Kara continue; 586884d179dSJan Kara /* Now we have active dquot so we can just increase use count */ 587884d179dSJan Kara atomic_inc(&dquot->dq_count); 588884d179dSJan Kara spin_unlock(&dq_list_lock); 589dde95888SDmitry Monakhov dqstats_inc(DQST_LOOKUPS); 590884d179dSJan Kara dqput(old_dquot); 591884d179dSJan Kara old_dquot = dquot; 5921362f4eaSJan Kara /* 5931362f4eaSJan Kara * ->release_dquot() can be racing with us. Our reference 5941362f4eaSJan Kara * protects us from new calls to it so just wait for any 5951362f4eaSJan Kara * outstanding call and recheck the DQ_ACTIVE_B after that. 5961362f4eaSJan Kara */ 5971362f4eaSJan Kara wait_on_dquot(dquot); 5981362f4eaSJan Kara if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { 599884d179dSJan Kara ret = fn(dquot, priv); 600884d179dSJan Kara if (ret < 0) 601884d179dSJan Kara goto out; 6021362f4eaSJan Kara } 603884d179dSJan Kara spin_lock(&dq_list_lock); 604884d179dSJan Kara /* We are safe to continue now because our dquot could not 605884d179dSJan Kara * be moved out of the inuse list while we hold the reference */ 606884d179dSJan Kara } 607884d179dSJan Kara spin_unlock(&dq_list_lock); 608884d179dSJan Kara out: 609884d179dSJan Kara dqput(old_dquot); 610884d179dSJan Kara return ret; 611884d179dSJan Kara } 612884d179dSJan Kara EXPORT_SYMBOL(dquot_scan_active); 613884d179dSJan Kara 614ceed1723SJan Kara /* Write all dquot structures to quota files */ 615ceed1723SJan Kara int dquot_writeback_dquots(struct super_block *sb, int type) 616884d179dSJan Kara { 617884d179dSJan Kara struct list_head *dirty; 618884d179dSJan Kara struct dquot *dquot; 619884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 620884d179dSJan Kara int cnt; 621ceed1723SJan Kara int err, ret = 0; 622884d179dSJan Kara 6239d1ccbe7SJan Kara WARN_ON_ONCE(!rwsem_is_locked(&sb->s_umount)); 6249d1ccbe7SJan Kara 625884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 626884d179dSJan Kara if (type != -1 && cnt != type) 627884d179dSJan Kara continue; 628884d179dSJan Kara if (!sb_has_quota_active(sb, cnt)) 629884d179dSJan Kara continue; 630884d179dSJan Kara spin_lock(&dq_list_lock); 631884d179dSJan Kara dirty = &dqopt->info[cnt].dqi_dirty_list; 632884d179dSJan Kara while (!list_empty(dirty)) { 633268157baSJan Kara dquot = list_first_entry(dirty, struct dquot, 634268157baSJan Kara dq_dirty); 635884d179dSJan Kara /* Dirty and inactive can be only bad dquot... */ 636884d179dSJan Kara if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { 637884d179dSJan Kara clear_dquot_dirty(dquot); 638884d179dSJan Kara continue; 639884d179dSJan Kara } 640884d179dSJan Kara /* Now we have active dquot from which someone is 641884d179dSJan Kara * holding reference so we can safely just increase 642884d179dSJan Kara * use count */ 6439f985cb6SJan Kara dqgrab(dquot); 644884d179dSJan Kara spin_unlock(&dq_list_lock); 645dde95888SDmitry Monakhov dqstats_inc(DQST_LOOKUPS); 646ceed1723SJan Kara err = sb->dq_op->write_dquot(dquot); 647ceed1723SJan Kara if (!ret && err) 648474d2605SJan Kara ret = err; 649884d179dSJan Kara dqput(dquot); 650884d179dSJan Kara spin_lock(&dq_list_lock); 651884d179dSJan Kara } 652884d179dSJan Kara spin_unlock(&dq_list_lock); 653884d179dSJan Kara } 654884d179dSJan Kara 655884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 656884d179dSJan Kara if ((cnt == type || type == -1) && sb_has_quota_active(sb, cnt) 657884d179dSJan Kara && info_dirty(&dqopt->info[cnt])) 658884d179dSJan Kara sb->dq_op->write_info(sb, cnt); 659dde95888SDmitry Monakhov dqstats_inc(DQST_SYNCS); 660884d179dSJan Kara 661ceed1723SJan Kara return ret; 662ceed1723SJan Kara } 663ceed1723SJan Kara EXPORT_SYMBOL(dquot_writeback_dquots); 664ceed1723SJan Kara 665ceed1723SJan Kara /* Write all dquot structures to disk and make them visible from userspace */ 666ceed1723SJan Kara int dquot_quota_sync(struct super_block *sb, int type) 667ceed1723SJan Kara { 668ceed1723SJan Kara struct quota_info *dqopt = sb_dqopt(sb); 669ceed1723SJan Kara int cnt; 670ceed1723SJan Kara int ret; 671ceed1723SJan Kara 672ceed1723SJan Kara ret = dquot_writeback_dquots(sb, type); 673ceed1723SJan Kara if (ret) 674ceed1723SJan Kara return ret; 675ceed1723SJan Kara if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) 6765fb324adSChristoph Hellwig return 0; 6775fb324adSChristoph Hellwig 6785fb324adSChristoph Hellwig /* This is not very clever (and fast) but currently I don't know about 6795fb324adSChristoph Hellwig * any other simple way of getting quota data to disk and we must get 6805fb324adSChristoph Hellwig * them there for userspace to be visible... */ 6815fb324adSChristoph Hellwig if (sb->s_op->sync_fs) 6825fb324adSChristoph Hellwig sb->s_op->sync_fs(sb, 1); 6835fb324adSChristoph Hellwig sync_blockdev(sb->s_bdev); 6845fb324adSChristoph Hellwig 6855fb324adSChristoph Hellwig /* 6865fb324adSChristoph Hellwig * Now when everything is written we can discard the pagecache so 6875fb324adSChristoph Hellwig * that userspace sees the changes. 6885fb324adSChristoph Hellwig */ 6895fb324adSChristoph Hellwig for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 6905fb324adSChristoph Hellwig if (type != -1 && cnt != type) 6915fb324adSChristoph Hellwig continue; 6925fb324adSChristoph Hellwig if (!sb_has_quota_active(sb, cnt)) 6935fb324adSChristoph Hellwig continue; 6945955102cSAl Viro inode_lock(dqopt->files[cnt]); 695f9ef1784SJan Kara truncate_inode_pages(&dqopt->files[cnt]->i_data, 0); 6965955102cSAl Viro inode_unlock(dqopt->files[cnt]); 6975fb324adSChristoph Hellwig } 6985fb324adSChristoph Hellwig 699884d179dSJan Kara return 0; 700884d179dSJan Kara } 701287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_quota_sync); 702884d179dSJan Kara 7031ab6c499SDave Chinner static unsigned long 7041ab6c499SDave Chinner dqcache_shrink_scan(struct shrinker *shrink, struct shrink_control *sc) 705884d179dSJan Kara { 706884d179dSJan Kara struct list_head *head; 707884d179dSJan Kara struct dquot *dquot; 7081ab6c499SDave Chinner unsigned long freed = 0; 709884d179dSJan Kara 710d68aab6bSNiu Yawei spin_lock(&dq_list_lock); 711884d179dSJan Kara head = free_dquots.prev; 7121ab6c499SDave Chinner while (head != &free_dquots && sc->nr_to_scan) { 713884d179dSJan Kara dquot = list_entry(head, struct dquot, dq_free); 714884d179dSJan Kara remove_dquot_hash(dquot); 715884d179dSJan Kara remove_free_dquot(dquot); 716884d179dSJan Kara remove_inuse(dquot); 717884d179dSJan Kara do_destroy_dquot(dquot); 7181ab6c499SDave Chinner sc->nr_to_scan--; 7191ab6c499SDave Chinner freed++; 720884d179dSJan Kara head = free_dquots.prev; 721884d179dSJan Kara } 722d68aab6bSNiu Yawei spin_unlock(&dq_list_lock); 7231ab6c499SDave Chinner return freed; 724884d179dSJan Kara } 725884d179dSJan Kara 7261ab6c499SDave Chinner static unsigned long 7271ab6c499SDave Chinner dqcache_shrink_count(struct shrinker *shrink, struct shrink_control *sc) 728884d179dSJan Kara { 72955f841ceSGlauber Costa return vfs_pressure_ratio( 73055f841ceSGlauber Costa percpu_counter_read_positive(&dqstats.counter[DQST_FREE_DQUOTS])); 731884d179dSJan Kara } 732884d179dSJan Kara 733884d179dSJan Kara static struct shrinker dqcache_shrinker = { 7341ab6c499SDave Chinner .count_objects = dqcache_shrink_count, 7351ab6c499SDave Chinner .scan_objects = dqcache_shrink_scan, 736884d179dSJan Kara .seeks = DEFAULT_SEEKS, 737884d179dSJan Kara }; 738884d179dSJan Kara 739884d179dSJan Kara /* 740884d179dSJan Kara * Put reference to dquot 741884d179dSJan Kara */ 742884d179dSJan Kara void dqput(struct dquot *dquot) 743884d179dSJan Kara { 744884d179dSJan Kara int ret; 745884d179dSJan Kara 746884d179dSJan Kara if (!dquot) 747884d179dSJan Kara return; 74862af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 749884d179dSJan Kara if (!atomic_read(&dquot->dq_count)) { 750fb5ffb0eSJiaying Zhang quota_error(dquot->dq_sb, "trying to free free dquot of %s %d", 7514c376dcaSEric W. Biederman quotatypes[dquot->dq_id.type], 7524c376dcaSEric W. Biederman from_kqid(&init_user_ns, dquot->dq_id)); 753884d179dSJan Kara BUG(); 754884d179dSJan Kara } 755884d179dSJan Kara #endif 756dde95888SDmitry Monakhov dqstats_inc(DQST_DROPS); 757884d179dSJan Kara we_slept: 758884d179dSJan Kara spin_lock(&dq_list_lock); 759884d179dSJan Kara if (atomic_read(&dquot->dq_count) > 1) { 760884d179dSJan Kara /* We have more than one user... nothing to do */ 761884d179dSJan Kara atomic_dec(&dquot->dq_count); 762884d179dSJan Kara /* Releasing dquot during quotaoff phase? */ 7634c376dcaSEric W. Biederman if (!sb_has_quota_active(dquot->dq_sb, dquot->dq_id.type) && 764884d179dSJan Kara atomic_read(&dquot->dq_count) == 1) 765884d179dSJan Kara wake_up(&dquot->dq_wait_unused); 766884d179dSJan Kara spin_unlock(&dq_list_lock); 767884d179dSJan Kara return; 768884d179dSJan Kara } 769884d179dSJan Kara /* Need to release dquot? */ 770884d179dSJan Kara if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && dquot_dirty(dquot)) { 771884d179dSJan Kara spin_unlock(&dq_list_lock); 772884d179dSJan Kara /* Commit dquot before releasing */ 773884d179dSJan Kara ret = dquot->dq_sb->dq_op->write_dquot(dquot); 774884d179dSJan Kara if (ret < 0) { 775fb5ffb0eSJiaying Zhang quota_error(dquot->dq_sb, "Can't write quota structure" 776fb5ffb0eSJiaying Zhang " (error %d). Quota may get out of sync!", 777fb5ffb0eSJiaying Zhang ret); 778884d179dSJan Kara /* 779884d179dSJan Kara * We clear dirty bit anyway, so that we avoid 780884d179dSJan Kara * infinite loop here 781884d179dSJan Kara */ 782884d179dSJan Kara spin_lock(&dq_list_lock); 783884d179dSJan Kara clear_dquot_dirty(dquot); 784884d179dSJan Kara spin_unlock(&dq_list_lock); 785884d179dSJan Kara } 786884d179dSJan Kara goto we_slept; 787884d179dSJan Kara } 788884d179dSJan Kara /* Clear flag in case dquot was inactive (something bad happened) */ 789884d179dSJan Kara clear_dquot_dirty(dquot); 790884d179dSJan Kara if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { 791884d179dSJan Kara spin_unlock(&dq_list_lock); 792884d179dSJan Kara dquot->dq_sb->dq_op->release_dquot(dquot); 793884d179dSJan Kara goto we_slept; 794884d179dSJan Kara } 795884d179dSJan Kara atomic_dec(&dquot->dq_count); 79662af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 797884d179dSJan Kara /* sanity check */ 798884d179dSJan Kara BUG_ON(!list_empty(&dquot->dq_free)); 799884d179dSJan Kara #endif 800884d179dSJan Kara put_dquot_last(dquot); 801884d179dSJan Kara spin_unlock(&dq_list_lock); 802884d179dSJan Kara } 803884d179dSJan Kara EXPORT_SYMBOL(dqput); 804884d179dSJan Kara 805884d179dSJan Kara struct dquot *dquot_alloc(struct super_block *sb, int type) 806884d179dSJan Kara { 807884d179dSJan Kara return kmem_cache_zalloc(dquot_cachep, GFP_NOFS); 808884d179dSJan Kara } 809884d179dSJan Kara EXPORT_SYMBOL(dquot_alloc); 810884d179dSJan Kara 811884d179dSJan Kara static struct dquot *get_empty_dquot(struct super_block *sb, int type) 812884d179dSJan Kara { 813884d179dSJan Kara struct dquot *dquot; 814884d179dSJan Kara 815884d179dSJan Kara dquot = sb->dq_op->alloc_dquot(sb, type); 816884d179dSJan Kara if(!dquot) 817dd6f3c6dSJan Kara return NULL; 818884d179dSJan Kara 819884d179dSJan Kara mutex_init(&dquot->dq_lock); 820884d179dSJan Kara INIT_LIST_HEAD(&dquot->dq_free); 821884d179dSJan Kara INIT_LIST_HEAD(&dquot->dq_inuse); 822884d179dSJan Kara INIT_HLIST_NODE(&dquot->dq_hash); 823884d179dSJan Kara INIT_LIST_HEAD(&dquot->dq_dirty); 824884d179dSJan Kara init_waitqueue_head(&dquot->dq_wait_unused); 825884d179dSJan Kara dquot->dq_sb = sb; 8261a06d420SEric W. Biederman dquot->dq_id = make_kqid_invalid(type); 827884d179dSJan Kara atomic_set(&dquot->dq_count, 1); 828884d179dSJan Kara 829884d179dSJan Kara return dquot; 830884d179dSJan Kara } 831884d179dSJan Kara 832884d179dSJan Kara /* 833884d179dSJan Kara * Get reference to dquot 834884d179dSJan Kara * 835884d179dSJan Kara * Locking is slightly tricky here. We are guarded from parallel quotaoff() 836884d179dSJan Kara * destroying our dquot by: 837884d179dSJan Kara * a) checking for quota flags under dq_list_lock and 838884d179dSJan Kara * b) getting a reference to dquot before we release dq_list_lock 839884d179dSJan Kara */ 840aca645a6SEric W. Biederman struct dquot *dqget(struct super_block *sb, struct kqid qid) 841884d179dSJan Kara { 8421a06d420SEric W. Biederman unsigned int hashent = hashfn(sb, qid); 8436184fc0bSJan Kara struct dquot *dquot, *empty = NULL; 844884d179dSJan Kara 845d49d3762SEric W. Biederman if (!qid_has_mapping(sb->s_user_ns, qid)) 846d49d3762SEric W. Biederman return ERR_PTR(-EINVAL); 847d49d3762SEric W. Biederman 8481a06d420SEric W. Biederman if (!sb_has_quota_active(sb, qid.type)) 8496184fc0bSJan Kara return ERR_PTR(-ESRCH); 850884d179dSJan Kara we_slept: 851884d179dSJan Kara spin_lock(&dq_list_lock); 852884d179dSJan Kara spin_lock(&dq_state_lock); 8531a06d420SEric W. Biederman if (!sb_has_quota_active(sb, qid.type)) { 854884d179dSJan Kara spin_unlock(&dq_state_lock); 855884d179dSJan Kara spin_unlock(&dq_list_lock); 8566184fc0bSJan Kara dquot = ERR_PTR(-ESRCH); 857884d179dSJan Kara goto out; 858884d179dSJan Kara } 859884d179dSJan Kara spin_unlock(&dq_state_lock); 860884d179dSJan Kara 8611a06d420SEric W. Biederman dquot = find_dquot(hashent, sb, qid); 862dd6f3c6dSJan Kara if (!dquot) { 863dd6f3c6dSJan Kara if (!empty) { 864884d179dSJan Kara spin_unlock(&dq_list_lock); 8651a06d420SEric W. Biederman empty = get_empty_dquot(sb, qid.type); 866dd6f3c6dSJan Kara if (!empty) 867884d179dSJan Kara schedule(); /* Try to wait for a moment... */ 868884d179dSJan Kara goto we_slept; 869884d179dSJan Kara } 870884d179dSJan Kara dquot = empty; 871dd6f3c6dSJan Kara empty = NULL; 8724c376dcaSEric W. Biederman dquot->dq_id = qid; 873884d179dSJan Kara /* all dquots go on the inuse_list */ 874884d179dSJan Kara put_inuse(dquot); 875884d179dSJan Kara /* hash it first so it can be found */ 876884d179dSJan Kara insert_dquot_hash(dquot); 877884d179dSJan Kara spin_unlock(&dq_list_lock); 878dde95888SDmitry Monakhov dqstats_inc(DQST_LOOKUPS); 879884d179dSJan Kara } else { 880884d179dSJan Kara if (!atomic_read(&dquot->dq_count)) 881884d179dSJan Kara remove_free_dquot(dquot); 882884d179dSJan Kara atomic_inc(&dquot->dq_count); 883884d179dSJan Kara spin_unlock(&dq_list_lock); 884dde95888SDmitry Monakhov dqstats_inc(DQST_CACHE_HITS); 885dde95888SDmitry Monakhov dqstats_inc(DQST_LOOKUPS); 886884d179dSJan Kara } 887268157baSJan Kara /* Wait for dq_lock - after this we know that either dquot_release() is 888268157baSJan Kara * already finished or it will be canceled due to dq_count > 1 test */ 889884d179dSJan Kara wait_on_dquot(dquot); 890268157baSJan Kara /* Read the dquot / allocate space in quota file */ 8916184fc0bSJan Kara if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { 8926184fc0bSJan Kara int err; 8936184fc0bSJan Kara 8946184fc0bSJan Kara err = sb->dq_op->acquire_dquot(dquot); 8956184fc0bSJan Kara if (err < 0) { 896884d179dSJan Kara dqput(dquot); 8976184fc0bSJan Kara dquot = ERR_PTR(err); 898884d179dSJan Kara goto out; 899884d179dSJan Kara } 9006184fc0bSJan Kara } 901044c9b67SJan Kara /* 902044c9b67SJan Kara * Make sure following reads see filled structure - paired with 903044c9b67SJan Kara * smp_mb__before_atomic() in dquot_acquire(). 904044c9b67SJan Kara */ 905044c9b67SJan Kara smp_rmb(); 90662af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 907884d179dSJan Kara BUG_ON(!dquot->dq_sb); /* Has somebody invalidated entry under us? */ 908884d179dSJan Kara #endif 909884d179dSJan Kara out: 910884d179dSJan Kara if (empty) 911884d179dSJan Kara do_destroy_dquot(empty); 912884d179dSJan Kara 913884d179dSJan Kara return dquot; 914884d179dSJan Kara } 915884d179dSJan Kara EXPORT_SYMBOL(dqget); 916884d179dSJan Kara 9172d0fa467SJan Kara static inline struct dquot **i_dquot(struct inode *inode) 9182d0fa467SJan Kara { 9192d0fa467SJan Kara return inode->i_sb->s_op->get_dquots(inode); 9202d0fa467SJan Kara } 9212d0fa467SJan Kara 922884d179dSJan Kara static int dqinit_needed(struct inode *inode, int type) 923884d179dSJan Kara { 9245bcd3b6fSKonstantin Khlebnikov struct dquot * const *dquots; 925884d179dSJan Kara int cnt; 926884d179dSJan Kara 927884d179dSJan Kara if (IS_NOQUOTA(inode)) 928884d179dSJan Kara return 0; 9295bcd3b6fSKonstantin Khlebnikov 9305bcd3b6fSKonstantin Khlebnikov dquots = i_dquot(inode); 931884d179dSJan Kara if (type != -1) 9325bcd3b6fSKonstantin Khlebnikov return !dquots[type]; 933884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 9345bcd3b6fSKonstantin Khlebnikov if (!dquots[cnt]) 935884d179dSJan Kara return 1; 936884d179dSJan Kara return 0; 937884d179dSJan Kara } 938884d179dSJan Kara 939c3b00446SJan Kara /* This routine is guarded by s_umount semaphore */ 940884d179dSJan Kara static void add_dquot_ref(struct super_block *sb, int type) 941884d179dSJan Kara { 942884d179dSJan Kara struct inode *inode, *old_inode = NULL; 94362af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 9440a5a9c72SJan Kara int reserved = 0; 9454c5e6c0eSJan Kara #endif 946884d179dSJan Kara 94774278da9SDave Chinner spin_lock(&sb->s_inode_list_lock); 948884d179dSJan Kara list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { 949250df6edSDave Chinner spin_lock(&inode->i_lock); 950250df6edSDave Chinner if ((inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW)) || 951250df6edSDave Chinner !atomic_read(&inode->i_writecount) || 952250df6edSDave Chinner !dqinit_needed(inode, type)) { 953250df6edSDave Chinner spin_unlock(&inode->i_lock); 9543ae5080fSLinus Torvalds continue; 955250df6edSDave Chinner } 956884d179dSJan Kara __iget(inode); 957250df6edSDave Chinner spin_unlock(&inode->i_lock); 95874278da9SDave Chinner spin_unlock(&sb->s_inode_list_lock); 959884d179dSJan Kara 960d7e97117SJan Kara #ifdef CONFIG_QUOTA_DEBUG 961d7e97117SJan Kara if (unlikely(inode_get_rsv_space(inode) > 0)) 962d7e97117SJan Kara reserved = 1; 963d7e97117SJan Kara #endif 964884d179dSJan Kara iput(old_inode); 965871a2931SChristoph Hellwig __dquot_initialize(inode, type); 96655fa6091SDave Chinner 96755fa6091SDave Chinner /* 96855fa6091SDave Chinner * We hold a reference to 'inode' so it couldn't have been 96955fa6091SDave Chinner * removed from s_inodes list while we dropped the 97074278da9SDave Chinner * s_inode_list_lock. We cannot iput the inode now as we can be 97155fa6091SDave Chinner * holding the last reference and we cannot iput it under 97274278da9SDave Chinner * s_inode_list_lock. So we keep the reference and iput it 97355fa6091SDave Chinner * later. 97455fa6091SDave Chinner */ 975884d179dSJan Kara old_inode = inode; 97674278da9SDave Chinner spin_lock(&sb->s_inode_list_lock); 977884d179dSJan Kara } 97874278da9SDave Chinner spin_unlock(&sb->s_inode_list_lock); 979884d179dSJan Kara iput(old_inode); 9800a5a9c72SJan Kara 98162af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 9820a5a9c72SJan Kara if (reserved) { 983fb5ffb0eSJiaying Zhang quota_error(sb, "Writes happened before quota was turned on " 984fb5ffb0eSJiaying Zhang "thus quota information is probably inconsistent. " 985fb5ffb0eSJiaying Zhang "Please run quotacheck(8)"); 9860a5a9c72SJan Kara } 9874c5e6c0eSJan Kara #endif 988884d179dSJan Kara } 989884d179dSJan Kara 990268157baSJan Kara /* 991268157baSJan Kara * Remove references to dquots from inode and add dquot to list for freeing 99225985edcSLucas De Marchi * if we have the last reference to dquot 993268157baSJan Kara */ 9949eb6463fSNiu Yawei static void remove_inode_dquot_ref(struct inode *inode, int type, 995884d179dSJan Kara struct list_head *tofree_head) 996884d179dSJan Kara { 9975bcd3b6fSKonstantin Khlebnikov struct dquot **dquots = i_dquot(inode); 9985bcd3b6fSKonstantin Khlebnikov struct dquot *dquot = dquots[type]; 999884d179dSJan Kara 10009eb6463fSNiu Yawei if (!dquot) 10019eb6463fSNiu Yawei return; 10029eb6463fSNiu Yawei 10035bcd3b6fSKonstantin Khlebnikov dquots[type] = NULL; 10049eb6463fSNiu Yawei if (list_empty(&dquot->dq_free)) { 10059eb6463fSNiu Yawei /* 10069eb6463fSNiu Yawei * The inode still has reference to dquot so it can't be in the 10079eb6463fSNiu Yawei * free list 10089eb6463fSNiu Yawei */ 1009884d179dSJan Kara spin_lock(&dq_list_lock); 1010268157baSJan Kara list_add(&dquot->dq_free, tofree_head); 1011884d179dSJan Kara spin_unlock(&dq_list_lock); 10129eb6463fSNiu Yawei } else { 10139eb6463fSNiu Yawei /* 10149eb6463fSNiu Yawei * Dquot is already in a list to put so we won't drop the last 10159eb6463fSNiu Yawei * reference here. 10169eb6463fSNiu Yawei */ 10179eb6463fSNiu Yawei dqput(dquot); 1018884d179dSJan Kara } 1019884d179dSJan Kara } 1020884d179dSJan Kara 1021268157baSJan Kara /* 1022268157baSJan Kara * Free list of dquots 1023268157baSJan Kara * Dquots are removed from inodes and no new references can be got so we are 1024268157baSJan Kara * the only ones holding reference 1025268157baSJan Kara */ 1026884d179dSJan Kara static void put_dquot_list(struct list_head *tofree_head) 1027884d179dSJan Kara { 1028884d179dSJan Kara struct list_head *act_head; 1029884d179dSJan Kara struct dquot *dquot; 1030884d179dSJan Kara 1031884d179dSJan Kara act_head = tofree_head->next; 1032884d179dSJan Kara while (act_head != tofree_head) { 1033884d179dSJan Kara dquot = list_entry(act_head, struct dquot, dq_free); 1034884d179dSJan Kara act_head = act_head->next; 1035268157baSJan Kara /* Remove dquot from the list so we won't have problems... */ 1036268157baSJan Kara list_del_init(&dquot->dq_free); 1037884d179dSJan Kara dqput(dquot); 1038884d179dSJan Kara } 1039884d179dSJan Kara } 1040884d179dSJan Kara 1041884d179dSJan Kara static void remove_dquot_ref(struct super_block *sb, int type, 1042884d179dSJan Kara struct list_head *tofree_head) 1043884d179dSJan Kara { 1044884d179dSJan Kara struct inode *inode; 10457af9cce8SDmitry Monakhov int reserved = 0; 1046884d179dSJan Kara 104774278da9SDave Chinner spin_lock(&sb->s_inode_list_lock); 1048884d179dSJan Kara list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { 10493ae5080fSLinus Torvalds /* 10503ae5080fSLinus Torvalds * We have to scan also I_NEW inodes because they can already 10513ae5080fSLinus Torvalds * have quota pointer initialized. Luckily, we need to touch 10523ae5080fSLinus Torvalds * only quota pointers and these have separate locking 1053b9ba6f94SNiu Yawei * (dq_data_lock). 10543ae5080fSLinus Torvalds */ 1055b9ba6f94SNiu Yawei spin_lock(&dq_data_lock); 10567af9cce8SDmitry Monakhov if (!IS_NOQUOTA(inode)) { 10577af9cce8SDmitry Monakhov if (unlikely(inode_get_rsv_space(inode) > 0)) 10587af9cce8SDmitry Monakhov reserved = 1; 1059884d179dSJan Kara remove_inode_dquot_ref(inode, type, tofree_head); 1060884d179dSJan Kara } 1061b9ba6f94SNiu Yawei spin_unlock(&dq_data_lock); 10627af9cce8SDmitry Monakhov } 106374278da9SDave Chinner spin_unlock(&sb->s_inode_list_lock); 10647af9cce8SDmitry Monakhov #ifdef CONFIG_QUOTA_DEBUG 10657af9cce8SDmitry Monakhov if (reserved) { 10667af9cce8SDmitry Monakhov printk(KERN_WARNING "VFS (%s): Writes happened after quota" 10677af9cce8SDmitry Monakhov " was disabled thus quota information is probably " 10687af9cce8SDmitry Monakhov "inconsistent. Please run quotacheck(8).\n", sb->s_id); 10697af9cce8SDmitry Monakhov } 10707af9cce8SDmitry Monakhov #endif 1071884d179dSJan Kara } 1072884d179dSJan Kara 1073884d179dSJan Kara /* Gather all references from inodes and drop them */ 1074884d179dSJan Kara static void drop_dquot_ref(struct super_block *sb, int type) 1075884d179dSJan Kara { 1076884d179dSJan Kara LIST_HEAD(tofree_head); 1077884d179dSJan Kara 1078884d179dSJan Kara if (sb->dq_op) { 1079884d179dSJan Kara remove_dquot_ref(sb, type, &tofree_head); 1080b9ba6f94SNiu Yawei synchronize_srcu(&dquot_srcu); 1081884d179dSJan Kara put_dquot_list(&tofree_head); 1082884d179dSJan Kara } 1083884d179dSJan Kara } 1084884d179dSJan Kara 1085884d179dSJan Kara static inline void dquot_incr_inodes(struct dquot *dquot, qsize_t number) 1086884d179dSJan Kara { 1087884d179dSJan Kara dquot->dq_dqb.dqb_curinodes += number; 1088884d179dSJan Kara } 1089884d179dSJan Kara 1090884d179dSJan Kara static inline void dquot_incr_space(struct dquot *dquot, qsize_t number) 1091884d179dSJan Kara { 1092884d179dSJan Kara dquot->dq_dqb.dqb_curspace += number; 1093884d179dSJan Kara } 1094884d179dSJan Kara 1095884d179dSJan Kara static inline void dquot_resv_space(struct dquot *dquot, qsize_t number) 1096884d179dSJan Kara { 1097884d179dSJan Kara dquot->dq_dqb.dqb_rsvspace += number; 1098884d179dSJan Kara } 1099884d179dSJan Kara 1100884d179dSJan Kara /* 1101884d179dSJan Kara * Claim reserved quota space 1102884d179dSJan Kara */ 11030a5a9c72SJan Kara static void dquot_claim_reserved_space(struct dquot *dquot, qsize_t number) 1104884d179dSJan Kara { 11050a5a9c72SJan Kara if (dquot->dq_dqb.dqb_rsvspace < number) { 11060a5a9c72SJan Kara WARN_ON_ONCE(1); 11070a5a9c72SJan Kara number = dquot->dq_dqb.dqb_rsvspace; 11080a5a9c72SJan Kara } 1109884d179dSJan Kara dquot->dq_dqb.dqb_curspace += number; 1110884d179dSJan Kara dquot->dq_dqb.dqb_rsvspace -= number; 1111884d179dSJan Kara } 1112884d179dSJan Kara 11131c8924ebSJan Kara static void dquot_reclaim_reserved_space(struct dquot *dquot, qsize_t number) 11141c8924ebSJan Kara { 11151c8924ebSJan Kara if (WARN_ON_ONCE(dquot->dq_dqb.dqb_curspace < number)) 11161c8924ebSJan Kara number = dquot->dq_dqb.dqb_curspace; 11171c8924ebSJan Kara dquot->dq_dqb.dqb_rsvspace += number; 11181c8924ebSJan Kara dquot->dq_dqb.dqb_curspace -= number; 11191c8924ebSJan Kara } 11201c8924ebSJan Kara 1121884d179dSJan Kara static inline 1122884d179dSJan Kara void dquot_free_reserved_space(struct dquot *dquot, qsize_t number) 1123884d179dSJan Kara { 11240a5a9c72SJan Kara if (dquot->dq_dqb.dqb_rsvspace >= number) 1125884d179dSJan Kara dquot->dq_dqb.dqb_rsvspace -= number; 11260a5a9c72SJan Kara else { 11270a5a9c72SJan Kara WARN_ON_ONCE(1); 11280a5a9c72SJan Kara dquot->dq_dqb.dqb_rsvspace = 0; 11290a5a9c72SJan Kara } 1130884d179dSJan Kara } 1131884d179dSJan Kara 11327a2435d8SJan Kara static void dquot_decr_inodes(struct dquot *dquot, qsize_t number) 1133884d179dSJan Kara { 1134884d179dSJan Kara if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE || 1135884d179dSJan Kara dquot->dq_dqb.dqb_curinodes >= number) 1136884d179dSJan Kara dquot->dq_dqb.dqb_curinodes -= number; 1137884d179dSJan Kara else 1138884d179dSJan Kara dquot->dq_dqb.dqb_curinodes = 0; 1139884d179dSJan Kara if (dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit) 1140e008bb61SArnd Bergmann dquot->dq_dqb.dqb_itime = (time64_t) 0; 1141884d179dSJan Kara clear_bit(DQ_INODES_B, &dquot->dq_flags); 1142884d179dSJan Kara } 1143884d179dSJan Kara 11447a2435d8SJan Kara static void dquot_decr_space(struct dquot *dquot, qsize_t number) 1145884d179dSJan Kara { 1146884d179dSJan Kara if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE || 1147884d179dSJan Kara dquot->dq_dqb.dqb_curspace >= number) 1148884d179dSJan Kara dquot->dq_dqb.dqb_curspace -= number; 1149884d179dSJan Kara else 1150884d179dSJan Kara dquot->dq_dqb.dqb_curspace = 0; 1151884d179dSJan Kara if (dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit) 1152e008bb61SArnd Bergmann dquot->dq_dqb.dqb_btime = (time64_t) 0; 1153884d179dSJan Kara clear_bit(DQ_BLKS_B, &dquot->dq_flags); 1154884d179dSJan Kara } 1155884d179dSJan Kara 1156bf097aafSJan Kara struct dquot_warn { 1157bf097aafSJan Kara struct super_block *w_sb; 11587b9c7321SEric W. Biederman struct kqid w_dq_id; 1159bf097aafSJan Kara short w_type; 1160bf097aafSJan Kara }; 1161bf097aafSJan Kara 1162884d179dSJan Kara static int warning_issued(struct dquot *dquot, const int warntype) 1163884d179dSJan Kara { 1164884d179dSJan Kara int flag = (warntype == QUOTA_NL_BHARDWARN || 1165884d179dSJan Kara warntype == QUOTA_NL_BSOFTLONGWARN) ? DQ_BLKS_B : 1166884d179dSJan Kara ((warntype == QUOTA_NL_IHARDWARN || 1167884d179dSJan Kara warntype == QUOTA_NL_ISOFTLONGWARN) ? DQ_INODES_B : 0); 1168884d179dSJan Kara 1169884d179dSJan Kara if (!flag) 1170884d179dSJan Kara return 0; 1171884d179dSJan Kara return test_and_set_bit(flag, &dquot->dq_flags); 1172884d179dSJan Kara } 1173884d179dSJan Kara 1174884d179dSJan Kara #ifdef CONFIG_PRINT_QUOTA_WARNING 1175884d179dSJan Kara static int flag_print_warnings = 1; 1176884d179dSJan Kara 1177bf097aafSJan Kara static int need_print_warning(struct dquot_warn *warn) 1178884d179dSJan Kara { 1179884d179dSJan Kara if (!flag_print_warnings) 1180884d179dSJan Kara return 0; 1181884d179dSJan Kara 11827b9c7321SEric W. Biederman switch (warn->w_dq_id.type) { 1183884d179dSJan Kara case USRQUOTA: 11841a06d420SEric W. Biederman return uid_eq(current_fsuid(), warn->w_dq_id.uid); 1185884d179dSJan Kara case GRPQUOTA: 11867b9c7321SEric W. Biederman return in_group_p(warn->w_dq_id.gid); 1187847aac64SLi Xi case PRJQUOTA: 1188847aac64SLi Xi return 1; 1189884d179dSJan Kara } 1190884d179dSJan Kara return 0; 1191884d179dSJan Kara } 1192884d179dSJan Kara 1193884d179dSJan Kara /* Print warning to user which exceeded quota */ 1194bf097aafSJan Kara static void print_warning(struct dquot_warn *warn) 1195884d179dSJan Kara { 1196884d179dSJan Kara char *msg = NULL; 1197884d179dSJan Kara struct tty_struct *tty; 1198bf097aafSJan Kara int warntype = warn->w_type; 1199884d179dSJan Kara 1200884d179dSJan Kara if (warntype == QUOTA_NL_IHARDBELOW || 1201884d179dSJan Kara warntype == QUOTA_NL_ISOFTBELOW || 1202884d179dSJan Kara warntype == QUOTA_NL_BHARDBELOW || 1203bf097aafSJan Kara warntype == QUOTA_NL_BSOFTBELOW || !need_print_warning(warn)) 1204884d179dSJan Kara return; 1205884d179dSJan Kara 1206884d179dSJan Kara tty = get_current_tty(); 1207884d179dSJan Kara if (!tty) 1208884d179dSJan Kara return; 1209bf097aafSJan Kara tty_write_message(tty, warn->w_sb->s_id); 1210884d179dSJan Kara if (warntype == QUOTA_NL_ISOFTWARN || warntype == QUOTA_NL_BSOFTWARN) 1211884d179dSJan Kara tty_write_message(tty, ": warning, "); 1212884d179dSJan Kara else 1213884d179dSJan Kara tty_write_message(tty, ": write failed, "); 12147b9c7321SEric W. Biederman tty_write_message(tty, quotatypes[warn->w_dq_id.type]); 1215884d179dSJan Kara switch (warntype) { 1216884d179dSJan Kara case QUOTA_NL_IHARDWARN: 1217884d179dSJan Kara msg = " file limit reached.\r\n"; 1218884d179dSJan Kara break; 1219884d179dSJan Kara case QUOTA_NL_ISOFTLONGWARN: 1220884d179dSJan Kara msg = " file quota exceeded too long.\r\n"; 1221884d179dSJan Kara break; 1222884d179dSJan Kara case QUOTA_NL_ISOFTWARN: 1223884d179dSJan Kara msg = " file quota exceeded.\r\n"; 1224884d179dSJan Kara break; 1225884d179dSJan Kara case QUOTA_NL_BHARDWARN: 1226884d179dSJan Kara msg = " block limit reached.\r\n"; 1227884d179dSJan Kara break; 1228884d179dSJan Kara case QUOTA_NL_BSOFTLONGWARN: 1229884d179dSJan Kara msg = " block quota exceeded too long.\r\n"; 1230884d179dSJan Kara break; 1231884d179dSJan Kara case QUOTA_NL_BSOFTWARN: 1232884d179dSJan Kara msg = " block quota exceeded.\r\n"; 1233884d179dSJan Kara break; 1234884d179dSJan Kara } 1235884d179dSJan Kara tty_write_message(tty, msg); 1236884d179dSJan Kara tty_kref_put(tty); 1237884d179dSJan Kara } 1238884d179dSJan Kara #endif 1239884d179dSJan Kara 1240bf097aafSJan Kara static void prepare_warning(struct dquot_warn *warn, struct dquot *dquot, 1241bf097aafSJan Kara int warntype) 1242bf097aafSJan Kara { 1243bf097aafSJan Kara if (warning_issued(dquot, warntype)) 1244bf097aafSJan Kara return; 1245bf097aafSJan Kara warn->w_type = warntype; 1246bf097aafSJan Kara warn->w_sb = dquot->dq_sb; 1247bf097aafSJan Kara warn->w_dq_id = dquot->dq_id; 1248bf097aafSJan Kara } 1249bf097aafSJan Kara 1250884d179dSJan Kara /* 1251884d179dSJan Kara * Write warnings to the console and send warning messages over netlink. 1252884d179dSJan Kara * 1253bf097aafSJan Kara * Note that this function can call into tty and networking code. 1254884d179dSJan Kara */ 1255bf097aafSJan Kara static void flush_warnings(struct dquot_warn *warn) 1256884d179dSJan Kara { 1257884d179dSJan Kara int i; 1258884d179dSJan Kara 125986e931a3SSteven Whitehouse for (i = 0; i < MAXQUOTAS; i++) { 1260bf097aafSJan Kara if (warn[i].w_type == QUOTA_NL_NOWARN) 1261bf097aafSJan Kara continue; 1262884d179dSJan Kara #ifdef CONFIG_PRINT_QUOTA_WARNING 1263bf097aafSJan Kara print_warning(&warn[i]); 1264884d179dSJan Kara #endif 12657b9c7321SEric W. Biederman quota_send_warning(warn[i].w_dq_id, 1266bf097aafSJan Kara warn[i].w_sb->s_dev, warn[i].w_type); 1267884d179dSJan Kara } 1268884d179dSJan Kara } 1269884d179dSJan Kara 12707a2435d8SJan Kara static int ignore_hardlimit(struct dquot *dquot) 1271884d179dSJan Kara { 12724c376dcaSEric W. Biederman struct mem_dqinfo *info = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_id.type]; 1273884d179dSJan Kara 1274884d179dSJan Kara return capable(CAP_SYS_RESOURCE) && 1275268157baSJan Kara (info->dqi_format->qf_fmt_id != QFMT_VFS_OLD || 12769c45101eSJan Kara !(info->dqi_flags & DQF_ROOT_SQUASH)); 1277884d179dSJan Kara } 1278884d179dSJan Kara 1279884d179dSJan Kara /* needs dq_data_lock */ 1280bf097aafSJan Kara static int check_idq(struct dquot *dquot, qsize_t inodes, 1281bf097aafSJan Kara struct dquot_warn *warn) 1282884d179dSJan Kara { 1283268157baSJan Kara qsize_t newinodes = dquot->dq_dqb.dqb_curinodes + inodes; 1284268157baSJan Kara 12854c376dcaSEric W. Biederman if (!sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_id.type) || 1286884d179dSJan Kara test_bit(DQ_FAKE_B, &dquot->dq_flags)) 1287efd8f0e6SChristoph Hellwig return 0; 1288884d179dSJan Kara 1289884d179dSJan Kara if (dquot->dq_dqb.dqb_ihardlimit && 1290268157baSJan Kara newinodes > dquot->dq_dqb.dqb_ihardlimit && 1291884d179dSJan Kara !ignore_hardlimit(dquot)) { 1292bf097aafSJan Kara prepare_warning(warn, dquot, QUOTA_NL_IHARDWARN); 1293efd8f0e6SChristoph Hellwig return -EDQUOT; 1294884d179dSJan Kara } 1295884d179dSJan Kara 1296884d179dSJan Kara if (dquot->dq_dqb.dqb_isoftlimit && 1297268157baSJan Kara newinodes > dquot->dq_dqb.dqb_isoftlimit && 1298268157baSJan Kara dquot->dq_dqb.dqb_itime && 1299e008bb61SArnd Bergmann ktime_get_real_seconds() >= dquot->dq_dqb.dqb_itime && 1300884d179dSJan Kara !ignore_hardlimit(dquot)) { 1301bf097aafSJan Kara prepare_warning(warn, dquot, QUOTA_NL_ISOFTLONGWARN); 1302efd8f0e6SChristoph Hellwig return -EDQUOT; 1303884d179dSJan Kara } 1304884d179dSJan Kara 1305884d179dSJan Kara if (dquot->dq_dqb.dqb_isoftlimit && 1306268157baSJan Kara newinodes > dquot->dq_dqb.dqb_isoftlimit && 1307884d179dSJan Kara dquot->dq_dqb.dqb_itime == 0) { 1308bf097aafSJan Kara prepare_warning(warn, dquot, QUOTA_NL_ISOFTWARN); 1309e008bb61SArnd Bergmann dquot->dq_dqb.dqb_itime = ktime_get_real_seconds() + 13104c376dcaSEric W. Biederman sb_dqopt(dquot->dq_sb)->info[dquot->dq_id.type].dqi_igrace; 1311884d179dSJan Kara } 1312884d179dSJan Kara 1313efd8f0e6SChristoph Hellwig return 0; 1314884d179dSJan Kara } 1315884d179dSJan Kara 1316884d179dSJan Kara /* needs dq_data_lock */ 1317bf097aafSJan Kara static int check_bdq(struct dquot *dquot, qsize_t space, int prealloc, 1318bf097aafSJan Kara struct dquot_warn *warn) 1319884d179dSJan Kara { 1320884d179dSJan Kara qsize_t tspace; 1321268157baSJan Kara struct super_block *sb = dquot->dq_sb; 1322884d179dSJan Kara 13234c376dcaSEric W. Biederman if (!sb_has_quota_limits_enabled(sb, dquot->dq_id.type) || 1324884d179dSJan Kara test_bit(DQ_FAKE_B, &dquot->dq_flags)) 1325efd8f0e6SChristoph Hellwig return 0; 1326884d179dSJan Kara 1327884d179dSJan Kara tspace = dquot->dq_dqb.dqb_curspace + dquot->dq_dqb.dqb_rsvspace 1328884d179dSJan Kara + space; 1329884d179dSJan Kara 1330884d179dSJan Kara if (dquot->dq_dqb.dqb_bhardlimit && 1331884d179dSJan Kara tspace > dquot->dq_dqb.dqb_bhardlimit && 1332884d179dSJan Kara !ignore_hardlimit(dquot)) { 1333884d179dSJan Kara if (!prealloc) 1334bf097aafSJan Kara prepare_warning(warn, dquot, QUOTA_NL_BHARDWARN); 1335efd8f0e6SChristoph Hellwig return -EDQUOT; 1336884d179dSJan Kara } 1337884d179dSJan Kara 1338884d179dSJan Kara if (dquot->dq_dqb.dqb_bsoftlimit && 1339884d179dSJan Kara tspace > dquot->dq_dqb.dqb_bsoftlimit && 1340268157baSJan Kara dquot->dq_dqb.dqb_btime && 1341e008bb61SArnd Bergmann ktime_get_real_seconds() >= dquot->dq_dqb.dqb_btime && 1342884d179dSJan Kara !ignore_hardlimit(dquot)) { 1343884d179dSJan Kara if (!prealloc) 1344bf097aafSJan Kara prepare_warning(warn, dquot, QUOTA_NL_BSOFTLONGWARN); 1345efd8f0e6SChristoph Hellwig return -EDQUOT; 1346884d179dSJan Kara } 1347884d179dSJan Kara 1348884d179dSJan Kara if (dquot->dq_dqb.dqb_bsoftlimit && 1349884d179dSJan Kara tspace > dquot->dq_dqb.dqb_bsoftlimit && 1350884d179dSJan Kara dquot->dq_dqb.dqb_btime == 0) { 1351884d179dSJan Kara if (!prealloc) { 1352bf097aafSJan Kara prepare_warning(warn, dquot, QUOTA_NL_BSOFTWARN); 1353e008bb61SArnd Bergmann dquot->dq_dqb.dqb_btime = ktime_get_real_seconds() + 13544c376dcaSEric W. Biederman sb_dqopt(sb)->info[dquot->dq_id.type].dqi_bgrace; 1355884d179dSJan Kara } 1356884d179dSJan Kara else 1357884d179dSJan Kara /* 1358884d179dSJan Kara * We don't allow preallocation to exceed softlimit so exceeding will 1359884d179dSJan Kara * be always printed 1360884d179dSJan Kara */ 1361efd8f0e6SChristoph Hellwig return -EDQUOT; 1362884d179dSJan Kara } 1363884d179dSJan Kara 1364efd8f0e6SChristoph Hellwig return 0; 1365884d179dSJan Kara } 1366884d179dSJan Kara 1367884d179dSJan Kara static int info_idq_free(struct dquot *dquot, qsize_t inodes) 1368884d179dSJan Kara { 1369268157baSJan Kara qsize_t newinodes; 1370268157baSJan Kara 1371884d179dSJan Kara if (test_bit(DQ_FAKE_B, &dquot->dq_flags) || 1372884d179dSJan Kara dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit || 13734c376dcaSEric W. Biederman !sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_id.type)) 1374884d179dSJan Kara return QUOTA_NL_NOWARN; 1375884d179dSJan Kara 1376268157baSJan Kara newinodes = dquot->dq_dqb.dqb_curinodes - inodes; 1377268157baSJan Kara if (newinodes <= dquot->dq_dqb.dqb_isoftlimit) 1378884d179dSJan Kara return QUOTA_NL_ISOFTBELOW; 1379884d179dSJan Kara if (dquot->dq_dqb.dqb_curinodes >= dquot->dq_dqb.dqb_ihardlimit && 1380268157baSJan Kara newinodes < dquot->dq_dqb.dqb_ihardlimit) 1381884d179dSJan Kara return QUOTA_NL_IHARDBELOW; 1382884d179dSJan Kara return QUOTA_NL_NOWARN; 1383884d179dSJan Kara } 1384884d179dSJan Kara 1385884d179dSJan Kara static int info_bdq_free(struct dquot *dquot, qsize_t space) 1386884d179dSJan Kara { 1387884d179dSJan Kara if (test_bit(DQ_FAKE_B, &dquot->dq_flags) || 1388884d179dSJan Kara dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit) 1389884d179dSJan Kara return QUOTA_NL_NOWARN; 1390884d179dSJan Kara 1391884d179dSJan Kara if (dquot->dq_dqb.dqb_curspace - space <= dquot->dq_dqb.dqb_bsoftlimit) 1392884d179dSJan Kara return QUOTA_NL_BSOFTBELOW; 1393884d179dSJan Kara if (dquot->dq_dqb.dqb_curspace >= dquot->dq_dqb.dqb_bhardlimit && 1394884d179dSJan Kara dquot->dq_dqb.dqb_curspace - space < dquot->dq_dqb.dqb_bhardlimit) 1395884d179dSJan Kara return QUOTA_NL_BHARDBELOW; 1396884d179dSJan Kara return QUOTA_NL_NOWARN; 1397884d179dSJan Kara } 13980a5a9c72SJan Kara 1399189eef59SChristoph Hellwig static int dquot_active(const struct inode *inode) 1400189eef59SChristoph Hellwig { 1401189eef59SChristoph Hellwig struct super_block *sb = inode->i_sb; 1402189eef59SChristoph Hellwig 1403189eef59SChristoph Hellwig if (IS_NOQUOTA(inode)) 1404189eef59SChristoph Hellwig return 0; 1405189eef59SChristoph Hellwig return sb_any_quota_loaded(sb) & ~sb_any_quota_suspended(sb); 1406189eef59SChristoph Hellwig } 1407189eef59SChristoph Hellwig 1408884d179dSJan Kara /* 1409884d179dSJan Kara * Initialize quota pointers in inode 1410871a2931SChristoph Hellwig * 1411871a2931SChristoph Hellwig * It is better to call this function outside of any transaction as it 1412871a2931SChristoph Hellwig * might need a lot of space in journal for dquot structure allocation. 1413884d179dSJan Kara */ 14146184fc0bSJan Kara static int __dquot_initialize(struct inode *inode, int type) 1415884d179dSJan Kara { 14161ea06becSNiu Yawei int cnt, init_needed = 0; 1417ab73ef46SNikolay Borisov struct dquot **dquots, *got[MAXQUOTAS] = {}; 1418884d179dSJan Kara struct super_block *sb = inode->i_sb; 14190a5a9c72SJan Kara qsize_t rsv; 14206184fc0bSJan Kara int ret = 0; 1421884d179dSJan Kara 1422189eef59SChristoph Hellwig if (!dquot_active(inode)) 14236184fc0bSJan Kara return 0; 1424884d179dSJan Kara 14255bcd3b6fSKonstantin Khlebnikov dquots = i_dquot(inode); 14265bcd3b6fSKonstantin Khlebnikov 1427884d179dSJan Kara /* First get references to structures we might need. */ 1428884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1429aca645a6SEric W. Biederman struct kqid qid; 1430847aac64SLi Xi kprojid_t projid; 1431847aac64SLi Xi int rc; 14326184fc0bSJan Kara struct dquot *dquot; 1433847aac64SLi Xi 1434884d179dSJan Kara if (type != -1 && cnt != type) 1435884d179dSJan Kara continue; 14361ea06becSNiu Yawei /* 14371ea06becSNiu Yawei * The i_dquot should have been initialized in most cases, 14381ea06becSNiu Yawei * we check it without locking here to avoid unnecessary 14391ea06becSNiu Yawei * dqget()/dqput() calls. 14401ea06becSNiu Yawei */ 14415bcd3b6fSKonstantin Khlebnikov if (dquots[cnt]) 14421ea06becSNiu Yawei continue; 1443847aac64SLi Xi 1444847aac64SLi Xi if (!sb_has_quota_active(sb, cnt)) 1445847aac64SLi Xi continue; 1446847aac64SLi Xi 14471ea06becSNiu Yawei init_needed = 1; 14481ea06becSNiu Yawei 1449884d179dSJan Kara switch (cnt) { 1450884d179dSJan Kara case USRQUOTA: 1451aca645a6SEric W. Biederman qid = make_kqid_uid(inode->i_uid); 1452884d179dSJan Kara break; 1453884d179dSJan Kara case GRPQUOTA: 1454aca645a6SEric W. Biederman qid = make_kqid_gid(inode->i_gid); 1455884d179dSJan Kara break; 1456847aac64SLi Xi case PRJQUOTA: 1457847aac64SLi Xi rc = inode->i_sb->dq_op->get_projid(inode, &projid); 1458847aac64SLi Xi if (rc) 1459847aac64SLi Xi continue; 1460847aac64SLi Xi qid = make_kqid_projid(projid); 1461847aac64SLi Xi break; 1462884d179dSJan Kara } 14636184fc0bSJan Kara dquot = dqget(sb, qid); 14646184fc0bSJan Kara if (IS_ERR(dquot)) { 14656184fc0bSJan Kara /* We raced with somebody turning quotas off... */ 14666184fc0bSJan Kara if (PTR_ERR(dquot) != -ESRCH) { 14676184fc0bSJan Kara ret = PTR_ERR(dquot); 14686184fc0bSJan Kara goto out_put; 14696184fc0bSJan Kara } 14706184fc0bSJan Kara dquot = NULL; 14716184fc0bSJan Kara } 14726184fc0bSJan Kara got[cnt] = dquot; 1473884d179dSJan Kara } 1474884d179dSJan Kara 14751ea06becSNiu Yawei /* All required i_dquot has been initialized */ 14761ea06becSNiu Yawei if (!init_needed) 14776184fc0bSJan Kara return 0; 14781ea06becSNiu Yawei 1479b9ba6f94SNiu Yawei spin_lock(&dq_data_lock); 1480884d179dSJan Kara if (IS_NOQUOTA(inode)) 14816184fc0bSJan Kara goto out_lock; 1482884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1483884d179dSJan Kara if (type != -1 && cnt != type) 1484884d179dSJan Kara continue; 1485884d179dSJan Kara /* Avoid races with quotaoff() */ 1486884d179dSJan Kara if (!sb_has_quota_active(sb, cnt)) 1487884d179dSJan Kara continue; 14884408ea41SJan Kara /* We could race with quotaon or dqget() could have failed */ 14894408ea41SJan Kara if (!got[cnt]) 14904408ea41SJan Kara continue; 14915bcd3b6fSKonstantin Khlebnikov if (!dquots[cnt]) { 14925bcd3b6fSKonstantin Khlebnikov dquots[cnt] = got[cnt]; 1493dd6f3c6dSJan Kara got[cnt] = NULL; 14940a5a9c72SJan Kara /* 14950a5a9c72SJan Kara * Make quota reservation system happy if someone 14960a5a9c72SJan Kara * did a write before quota was turned on 14970a5a9c72SJan Kara */ 14980a5a9c72SJan Kara rsv = inode_get_rsv_space(inode); 1499b9ba6f94SNiu Yawei if (unlikely(rsv)) 15005bcd3b6fSKonstantin Khlebnikov dquot_resv_space(dquots[cnt], rsv); 1501884d179dSJan Kara } 1502884d179dSJan Kara } 15036184fc0bSJan Kara out_lock: 1504b9ba6f94SNiu Yawei spin_unlock(&dq_data_lock); 15056184fc0bSJan Kara out_put: 1506884d179dSJan Kara /* Drop unused references */ 1507dc52dd3aSDmitry Monakhov dqput_all(got); 15086184fc0bSJan Kara 15096184fc0bSJan Kara return ret; 1510871a2931SChristoph Hellwig } 1511871a2931SChristoph Hellwig 15126184fc0bSJan Kara int dquot_initialize(struct inode *inode) 1513871a2931SChristoph Hellwig { 15146184fc0bSJan Kara return __dquot_initialize(inode, -1); 1515884d179dSJan Kara } 1516884d179dSJan Kara EXPORT_SYMBOL(dquot_initialize); 1517884d179dSJan Kara 1518b8cb5a54STahsin Erdogan bool dquot_initialize_needed(struct inode *inode) 1519b8cb5a54STahsin Erdogan { 1520b8cb5a54STahsin Erdogan struct dquot **dquots; 1521b8cb5a54STahsin Erdogan int i; 1522b8cb5a54STahsin Erdogan 1523b8cb5a54STahsin Erdogan if (!dquot_active(inode)) 1524b8cb5a54STahsin Erdogan return false; 1525b8cb5a54STahsin Erdogan 1526b8cb5a54STahsin Erdogan dquots = i_dquot(inode); 1527b8cb5a54STahsin Erdogan for (i = 0; i < MAXQUOTAS; i++) 1528b8cb5a54STahsin Erdogan if (!dquots[i] && sb_has_quota_active(inode->i_sb, i)) 1529b8cb5a54STahsin Erdogan return true; 1530b8cb5a54STahsin Erdogan return false; 1531b8cb5a54STahsin Erdogan } 1532b8cb5a54STahsin Erdogan EXPORT_SYMBOL(dquot_initialize_needed); 1533b8cb5a54STahsin Erdogan 1534884d179dSJan Kara /* 1535b9ba6f94SNiu Yawei * Release all quotas referenced by inode. 1536b9ba6f94SNiu Yawei * 1537b9ba6f94SNiu Yawei * This function only be called on inode free or converting 1538b9ba6f94SNiu Yawei * a file to quota file, no other users for the i_dquot in 1539b9ba6f94SNiu Yawei * both cases, so we needn't call synchronize_srcu() after 1540b9ba6f94SNiu Yawei * clearing i_dquot. 1541884d179dSJan Kara */ 15429f754758SChristoph Hellwig static void __dquot_drop(struct inode *inode) 1543884d179dSJan Kara { 1544884d179dSJan Kara int cnt; 15455bcd3b6fSKonstantin Khlebnikov struct dquot **dquots = i_dquot(inode); 1546884d179dSJan Kara struct dquot *put[MAXQUOTAS]; 1547884d179dSJan Kara 1548b9ba6f94SNiu Yawei spin_lock(&dq_data_lock); 1549884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 15505bcd3b6fSKonstantin Khlebnikov put[cnt] = dquots[cnt]; 15515bcd3b6fSKonstantin Khlebnikov dquots[cnt] = NULL; 1552884d179dSJan Kara } 1553b9ba6f94SNiu Yawei spin_unlock(&dq_data_lock); 1554dc52dd3aSDmitry Monakhov dqput_all(put); 1555884d179dSJan Kara } 1556884d179dSJan Kara 15579f754758SChristoph Hellwig void dquot_drop(struct inode *inode) 1558884d179dSJan Kara { 15595bcd3b6fSKonstantin Khlebnikov struct dquot * const *dquots; 1560884d179dSJan Kara int cnt; 15619f754758SChristoph Hellwig 15629f754758SChristoph Hellwig if (IS_NOQUOTA(inode)) 15639f754758SChristoph Hellwig return; 15649f754758SChristoph Hellwig 15659f754758SChristoph Hellwig /* 15669f754758SChristoph Hellwig * Test before calling to rule out calls from proc and such 1567884d179dSJan Kara * where we are not allowed to block. Note that this is 1568884d179dSJan Kara * actually reliable test even without the lock - the caller 1569884d179dSJan Kara * must assure that nobody can come after the DQUOT_DROP and 15709f754758SChristoph Hellwig * add quota pointers back anyway. 15719f754758SChristoph Hellwig */ 15725bcd3b6fSKonstantin Khlebnikov dquots = i_dquot(inode); 15739f754758SChristoph Hellwig for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 15745bcd3b6fSKonstantin Khlebnikov if (dquots[cnt]) 1575884d179dSJan Kara break; 15769f754758SChristoph Hellwig } 15779f754758SChristoph Hellwig 1578884d179dSJan Kara if (cnt < MAXQUOTAS) 15799f754758SChristoph Hellwig __dquot_drop(inode); 1580884d179dSJan Kara } 15819f754758SChristoph Hellwig EXPORT_SYMBOL(dquot_drop); 1582884d179dSJan Kara 1583884d179dSJan Kara /* 1584fd8fbfc1SDmitry Monakhov * inode_reserved_space is managed internally by quota, and protected by 1585fd8fbfc1SDmitry Monakhov * i_lock similar to i_blocks+i_bytes. 1586fd8fbfc1SDmitry Monakhov */ 1587fd8fbfc1SDmitry Monakhov static qsize_t *inode_reserved_space(struct inode * inode) 1588fd8fbfc1SDmitry Monakhov { 1589fd8fbfc1SDmitry Monakhov /* Filesystem must explicitly define it's own method in order to use 1590fd8fbfc1SDmitry Monakhov * quota reservation interface */ 1591fd8fbfc1SDmitry Monakhov BUG_ON(!inode->i_sb->dq_op->get_reserved_space); 1592fd8fbfc1SDmitry Monakhov return inode->i_sb->dq_op->get_reserved_space(inode); 1593fd8fbfc1SDmitry Monakhov } 1594fd8fbfc1SDmitry Monakhov 1595c469070aSDmitry Monakhov void inode_add_rsv_space(struct inode *inode, qsize_t number) 1596fd8fbfc1SDmitry Monakhov { 1597fd8fbfc1SDmitry Monakhov spin_lock(&inode->i_lock); 1598fd8fbfc1SDmitry Monakhov *inode_reserved_space(inode) += number; 1599fd8fbfc1SDmitry Monakhov spin_unlock(&inode->i_lock); 1600fd8fbfc1SDmitry Monakhov } 1601c469070aSDmitry Monakhov EXPORT_SYMBOL(inode_add_rsv_space); 1602fd8fbfc1SDmitry Monakhov 1603c469070aSDmitry Monakhov void inode_claim_rsv_space(struct inode *inode, qsize_t number) 1604fd8fbfc1SDmitry Monakhov { 1605fd8fbfc1SDmitry Monakhov spin_lock(&inode->i_lock); 1606fd8fbfc1SDmitry Monakhov *inode_reserved_space(inode) -= number; 1607fd8fbfc1SDmitry Monakhov __inode_add_bytes(inode, number); 1608fd8fbfc1SDmitry Monakhov spin_unlock(&inode->i_lock); 1609fd8fbfc1SDmitry Monakhov } 1610c469070aSDmitry Monakhov EXPORT_SYMBOL(inode_claim_rsv_space); 1611fd8fbfc1SDmitry Monakhov 16121c8924ebSJan Kara void inode_reclaim_rsv_space(struct inode *inode, qsize_t number) 16131c8924ebSJan Kara { 16141c8924ebSJan Kara spin_lock(&inode->i_lock); 16151c8924ebSJan Kara *inode_reserved_space(inode) += number; 16161c8924ebSJan Kara __inode_sub_bytes(inode, number); 16171c8924ebSJan Kara spin_unlock(&inode->i_lock); 16181c8924ebSJan Kara } 16191c8924ebSJan Kara EXPORT_SYMBOL(inode_reclaim_rsv_space); 16201c8924ebSJan Kara 1621c469070aSDmitry Monakhov void inode_sub_rsv_space(struct inode *inode, qsize_t number) 1622fd8fbfc1SDmitry Monakhov { 1623fd8fbfc1SDmitry Monakhov spin_lock(&inode->i_lock); 1624fd8fbfc1SDmitry Monakhov *inode_reserved_space(inode) -= number; 1625fd8fbfc1SDmitry Monakhov spin_unlock(&inode->i_lock); 1626fd8fbfc1SDmitry Monakhov } 1627c469070aSDmitry Monakhov EXPORT_SYMBOL(inode_sub_rsv_space); 1628fd8fbfc1SDmitry Monakhov 1629fd8fbfc1SDmitry Monakhov static qsize_t inode_get_rsv_space(struct inode *inode) 1630fd8fbfc1SDmitry Monakhov { 1631fd8fbfc1SDmitry Monakhov qsize_t ret; 163205b5d898SJan Kara 163305b5d898SJan Kara if (!inode->i_sb->dq_op->get_reserved_space) 163405b5d898SJan Kara return 0; 1635fd8fbfc1SDmitry Monakhov spin_lock(&inode->i_lock); 1636fd8fbfc1SDmitry Monakhov ret = *inode_reserved_space(inode); 1637fd8fbfc1SDmitry Monakhov spin_unlock(&inode->i_lock); 1638fd8fbfc1SDmitry Monakhov return ret; 1639fd8fbfc1SDmitry Monakhov } 1640fd8fbfc1SDmitry Monakhov 1641fd8fbfc1SDmitry Monakhov static void inode_incr_space(struct inode *inode, qsize_t number, 1642fd8fbfc1SDmitry Monakhov int reserve) 1643fd8fbfc1SDmitry Monakhov { 1644fd8fbfc1SDmitry Monakhov if (reserve) 1645fd8fbfc1SDmitry Monakhov inode_add_rsv_space(inode, number); 1646fd8fbfc1SDmitry Monakhov else 1647fd8fbfc1SDmitry Monakhov inode_add_bytes(inode, number); 1648fd8fbfc1SDmitry Monakhov } 1649fd8fbfc1SDmitry Monakhov 1650fd8fbfc1SDmitry Monakhov static void inode_decr_space(struct inode *inode, qsize_t number, int reserve) 1651fd8fbfc1SDmitry Monakhov { 1652fd8fbfc1SDmitry Monakhov if (reserve) 1653fd8fbfc1SDmitry Monakhov inode_sub_rsv_space(inode, number); 1654fd8fbfc1SDmitry Monakhov else 1655fd8fbfc1SDmitry Monakhov inode_sub_bytes(inode, number); 1656fd8fbfc1SDmitry Monakhov } 1657fd8fbfc1SDmitry Monakhov 1658fd8fbfc1SDmitry Monakhov /* 16595dd4056dSChristoph Hellwig * This functions updates i_blocks+i_bytes fields and quota information 16605dd4056dSChristoph Hellwig * (together with appropriate checks). 16615dd4056dSChristoph Hellwig * 16625dd4056dSChristoph Hellwig * NOTE: We absolutely rely on the fact that caller dirties the inode 16635dd4056dSChristoph Hellwig * (usually helpers in quotaops.h care about this) and holds a handle for 16645dd4056dSChristoph Hellwig * the current transaction so that dquot write and inode write go into the 16655dd4056dSChristoph Hellwig * same transaction. 1666884d179dSJan Kara */ 1667884d179dSJan Kara 1668884d179dSJan Kara /* 1669884d179dSJan Kara * This operation can block, but only after everything is updated 1670884d179dSJan Kara */ 167156246f9aSEric Sandeen int __dquot_alloc_space(struct inode *inode, qsize_t number, int flags) 1672884d179dSJan Kara { 1673b9ba6f94SNiu Yawei int cnt, ret = 0, index; 1674bf097aafSJan Kara struct dquot_warn warn[MAXQUOTAS]; 167556246f9aSEric Sandeen int reserve = flags & DQUOT_SPACE_RESERVE; 16765bcd3b6fSKonstantin Khlebnikov struct dquot **dquots; 1677884d179dSJan Kara 1678189eef59SChristoph Hellwig if (!dquot_active(inode)) { 1679fd8fbfc1SDmitry Monakhov inode_incr_space(inode, number, reserve); 1680fd8fbfc1SDmitry Monakhov goto out; 1681fd8fbfc1SDmitry Monakhov } 1682fd8fbfc1SDmitry Monakhov 1683884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 1684bf097aafSJan Kara warn[cnt].w_type = QUOTA_NL_NOWARN; 1685884d179dSJan Kara 16865bcd3b6fSKonstantin Khlebnikov dquots = i_dquot(inode); 1687b9ba6f94SNiu Yawei index = srcu_read_lock(&dquot_srcu); 1688884d179dSJan Kara spin_lock(&dq_data_lock); 1689884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1690bf097aafSJan Kara if (!dquots[cnt]) 1691884d179dSJan Kara continue; 1692bf097aafSJan Kara ret = check_bdq(dquots[cnt], number, 1693bf097aafSJan Kara !(flags & DQUOT_SPACE_WARN), &warn[cnt]); 1694bf097aafSJan Kara if (ret && !(flags & DQUOT_SPACE_NOFAIL)) { 1695fd8fbfc1SDmitry Monakhov spin_unlock(&dq_data_lock); 1696fd8fbfc1SDmitry Monakhov goto out_flush_warn; 1697884d179dSJan Kara } 1698884d179dSJan Kara } 1699884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1700bf097aafSJan Kara if (!dquots[cnt]) 1701884d179dSJan Kara continue; 1702884d179dSJan Kara if (reserve) 1703bf097aafSJan Kara dquot_resv_space(dquots[cnt], number); 1704884d179dSJan Kara else 1705bf097aafSJan Kara dquot_incr_space(dquots[cnt], number); 1706884d179dSJan Kara } 1707fd8fbfc1SDmitry Monakhov inode_incr_space(inode, number, reserve); 1708884d179dSJan Kara spin_unlock(&dq_data_lock); 1709fd8fbfc1SDmitry Monakhov 1710fd8fbfc1SDmitry Monakhov if (reserve) 1711fd8fbfc1SDmitry Monakhov goto out_flush_warn; 1712bf097aafSJan Kara mark_all_dquot_dirty(dquots); 1713fd8fbfc1SDmitry Monakhov out_flush_warn: 1714b9ba6f94SNiu Yawei srcu_read_unlock(&dquot_srcu, index); 1715bf097aafSJan Kara flush_warnings(warn); 1716fd8fbfc1SDmitry Monakhov out: 1717884d179dSJan Kara return ret; 1718884d179dSJan Kara } 17195dd4056dSChristoph Hellwig EXPORT_SYMBOL(__dquot_alloc_space); 1720884d179dSJan Kara 1721884d179dSJan Kara /* 1722884d179dSJan Kara * This operation can block, but only after everything is updated 1723884d179dSJan Kara */ 17246bab3596SJan Kara int dquot_alloc_inode(struct inode *inode) 1725884d179dSJan Kara { 1726b9ba6f94SNiu Yawei int cnt, ret = 0, index; 1727bf097aafSJan Kara struct dquot_warn warn[MAXQUOTAS]; 17285bcd3b6fSKonstantin Khlebnikov struct dquot * const *dquots; 1729884d179dSJan Kara 1730189eef59SChristoph Hellwig if (!dquot_active(inode)) 173163936ddaSChristoph Hellwig return 0; 1732884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 1733bf097aafSJan Kara warn[cnt].w_type = QUOTA_NL_NOWARN; 1734b9ba6f94SNiu Yawei 17355bcd3b6fSKonstantin Khlebnikov dquots = i_dquot(inode); 1736b9ba6f94SNiu Yawei index = srcu_read_lock(&dquot_srcu); 1737884d179dSJan Kara spin_lock(&dq_data_lock); 1738884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1739bf097aafSJan Kara if (!dquots[cnt]) 1740884d179dSJan Kara continue; 1741bf097aafSJan Kara ret = check_idq(dquots[cnt], 1, &warn[cnt]); 1742efd8f0e6SChristoph Hellwig if (ret) 1743884d179dSJan Kara goto warn_put_all; 1744884d179dSJan Kara } 1745884d179dSJan Kara 1746884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1747bf097aafSJan Kara if (!dquots[cnt]) 1748884d179dSJan Kara continue; 1749bf097aafSJan Kara dquot_incr_inodes(dquots[cnt], 1); 1750884d179dSJan Kara } 1751efd8f0e6SChristoph Hellwig 1752884d179dSJan Kara warn_put_all: 1753884d179dSJan Kara spin_unlock(&dq_data_lock); 175463936ddaSChristoph Hellwig if (ret == 0) 1755bf097aafSJan Kara mark_all_dquot_dirty(dquots); 1756b9ba6f94SNiu Yawei srcu_read_unlock(&dquot_srcu, index); 1757bf097aafSJan Kara flush_warnings(warn); 1758884d179dSJan Kara return ret; 1759884d179dSJan Kara } 1760884d179dSJan Kara EXPORT_SYMBOL(dquot_alloc_inode); 1761884d179dSJan Kara 17625dd4056dSChristoph Hellwig /* 17635dd4056dSChristoph Hellwig * Convert in-memory reserved quotas to real consumed quotas 17645dd4056dSChristoph Hellwig */ 17655dd4056dSChristoph Hellwig int dquot_claim_space_nodirty(struct inode *inode, qsize_t number) 1766884d179dSJan Kara { 17675bcd3b6fSKonstantin Khlebnikov struct dquot **dquots; 1768b9ba6f94SNiu Yawei int cnt, index; 1769884d179dSJan Kara 1770189eef59SChristoph Hellwig if (!dquot_active(inode)) { 1771fd8fbfc1SDmitry Monakhov inode_claim_rsv_space(inode, number); 17725dd4056dSChristoph Hellwig return 0; 1773884d179dSJan Kara } 1774884d179dSJan Kara 17755bcd3b6fSKonstantin Khlebnikov dquots = i_dquot(inode); 1776b9ba6f94SNiu Yawei index = srcu_read_lock(&dquot_srcu); 1777884d179dSJan Kara spin_lock(&dq_data_lock); 1778884d179dSJan Kara /* Claim reserved quotas to allocated quotas */ 1779884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 17805bcd3b6fSKonstantin Khlebnikov if (dquots[cnt]) 17815bcd3b6fSKonstantin Khlebnikov dquot_claim_reserved_space(dquots[cnt], number); 1782884d179dSJan Kara } 1783884d179dSJan Kara /* Update inode bytes */ 1784fd8fbfc1SDmitry Monakhov inode_claim_rsv_space(inode, number); 1785884d179dSJan Kara spin_unlock(&dq_data_lock); 17865bcd3b6fSKonstantin Khlebnikov mark_all_dquot_dirty(dquots); 1787b9ba6f94SNiu Yawei srcu_read_unlock(&dquot_srcu, index); 17885dd4056dSChristoph Hellwig return 0; 1789884d179dSJan Kara } 17905dd4056dSChristoph Hellwig EXPORT_SYMBOL(dquot_claim_space_nodirty); 1791884d179dSJan Kara 1792884d179dSJan Kara /* 17931c8924ebSJan Kara * Convert allocated space back to in-memory reserved quotas 17941c8924ebSJan Kara */ 17951c8924ebSJan Kara void dquot_reclaim_space_nodirty(struct inode *inode, qsize_t number) 17961c8924ebSJan Kara { 17975bcd3b6fSKonstantin Khlebnikov struct dquot **dquots; 1798b9ba6f94SNiu Yawei int cnt, index; 17991c8924ebSJan Kara 18001c8924ebSJan Kara if (!dquot_active(inode)) { 18011c8924ebSJan Kara inode_reclaim_rsv_space(inode, number); 18021c8924ebSJan Kara return; 18031c8924ebSJan Kara } 18041c8924ebSJan Kara 18055bcd3b6fSKonstantin Khlebnikov dquots = i_dquot(inode); 1806b9ba6f94SNiu Yawei index = srcu_read_lock(&dquot_srcu); 18071c8924ebSJan Kara spin_lock(&dq_data_lock); 18081c8924ebSJan Kara /* Claim reserved quotas to allocated quotas */ 18091c8924ebSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 18105bcd3b6fSKonstantin Khlebnikov if (dquots[cnt]) 18115bcd3b6fSKonstantin Khlebnikov dquot_reclaim_reserved_space(dquots[cnt], number); 18121c8924ebSJan Kara } 18131c8924ebSJan Kara /* Update inode bytes */ 18141c8924ebSJan Kara inode_reclaim_rsv_space(inode, number); 18151c8924ebSJan Kara spin_unlock(&dq_data_lock); 18165bcd3b6fSKonstantin Khlebnikov mark_all_dquot_dirty(dquots); 1817b9ba6f94SNiu Yawei srcu_read_unlock(&dquot_srcu, index); 18181c8924ebSJan Kara return; 18191c8924ebSJan Kara } 18201c8924ebSJan Kara EXPORT_SYMBOL(dquot_reclaim_space_nodirty); 18211c8924ebSJan Kara 18221c8924ebSJan Kara /* 1823884d179dSJan Kara * This operation can block, but only after everything is updated 1824884d179dSJan Kara */ 182556246f9aSEric Sandeen void __dquot_free_space(struct inode *inode, qsize_t number, int flags) 1826884d179dSJan Kara { 1827884d179dSJan Kara unsigned int cnt; 1828bf097aafSJan Kara struct dquot_warn warn[MAXQUOTAS]; 18295bcd3b6fSKonstantin Khlebnikov struct dquot **dquots; 1830b9ba6f94SNiu Yawei int reserve = flags & DQUOT_SPACE_RESERVE, index; 1831884d179dSJan Kara 1832189eef59SChristoph Hellwig if (!dquot_active(inode)) { 1833fd8fbfc1SDmitry Monakhov inode_decr_space(inode, number, reserve); 18345dd4056dSChristoph Hellwig return; 1835884d179dSJan Kara } 1836884d179dSJan Kara 18375bcd3b6fSKonstantin Khlebnikov dquots = i_dquot(inode); 1838b9ba6f94SNiu Yawei index = srcu_read_lock(&dquot_srcu); 1839884d179dSJan Kara spin_lock(&dq_data_lock); 1840884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1841bf097aafSJan Kara int wtype; 1842bf097aafSJan Kara 1843bf097aafSJan Kara warn[cnt].w_type = QUOTA_NL_NOWARN; 1844bf097aafSJan Kara if (!dquots[cnt]) 1845884d179dSJan Kara continue; 1846bf097aafSJan Kara wtype = info_bdq_free(dquots[cnt], number); 1847bf097aafSJan Kara if (wtype != QUOTA_NL_NOWARN) 1848bf097aafSJan Kara prepare_warning(&warn[cnt], dquots[cnt], wtype); 1849fd8fbfc1SDmitry Monakhov if (reserve) 1850bf097aafSJan Kara dquot_free_reserved_space(dquots[cnt], number); 1851fd8fbfc1SDmitry Monakhov else 1852bf097aafSJan Kara dquot_decr_space(dquots[cnt], number); 1853884d179dSJan Kara } 1854fd8fbfc1SDmitry Monakhov inode_decr_space(inode, number, reserve); 1855884d179dSJan Kara spin_unlock(&dq_data_lock); 1856fd8fbfc1SDmitry Monakhov 1857fd8fbfc1SDmitry Monakhov if (reserve) 1858fd8fbfc1SDmitry Monakhov goto out_unlock; 1859bf097aafSJan Kara mark_all_dquot_dirty(dquots); 1860fd8fbfc1SDmitry Monakhov out_unlock: 1861b9ba6f94SNiu Yawei srcu_read_unlock(&dquot_srcu, index); 1862bf097aafSJan Kara flush_warnings(warn); 1863884d179dSJan Kara } 18645dd4056dSChristoph Hellwig EXPORT_SYMBOL(__dquot_free_space); 1865fd8fbfc1SDmitry Monakhov 1866fd8fbfc1SDmitry Monakhov /* 1867884d179dSJan Kara * This operation can block, but only after everything is updated 1868884d179dSJan Kara */ 18696bab3596SJan Kara void dquot_free_inode(struct inode *inode) 1870884d179dSJan Kara { 1871884d179dSJan Kara unsigned int cnt; 1872bf097aafSJan Kara struct dquot_warn warn[MAXQUOTAS]; 18735bcd3b6fSKonstantin Khlebnikov struct dquot * const *dquots; 1874b9ba6f94SNiu Yawei int index; 1875884d179dSJan Kara 1876189eef59SChristoph Hellwig if (!dquot_active(inode)) 187763936ddaSChristoph Hellwig return; 1878884d179dSJan Kara 18795bcd3b6fSKonstantin Khlebnikov dquots = i_dquot(inode); 1880b9ba6f94SNiu Yawei index = srcu_read_lock(&dquot_srcu); 1881884d179dSJan Kara spin_lock(&dq_data_lock); 1882884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1883bf097aafSJan Kara int wtype; 1884bf097aafSJan Kara 1885bf097aafSJan Kara warn[cnt].w_type = QUOTA_NL_NOWARN; 1886bf097aafSJan Kara if (!dquots[cnt]) 1887884d179dSJan Kara continue; 1888bf097aafSJan Kara wtype = info_idq_free(dquots[cnt], 1); 1889bf097aafSJan Kara if (wtype != QUOTA_NL_NOWARN) 1890bf097aafSJan Kara prepare_warning(&warn[cnt], dquots[cnt], wtype); 1891bf097aafSJan Kara dquot_decr_inodes(dquots[cnt], 1); 1892884d179dSJan Kara } 1893884d179dSJan Kara spin_unlock(&dq_data_lock); 1894bf097aafSJan Kara mark_all_dquot_dirty(dquots); 1895b9ba6f94SNiu Yawei srcu_read_unlock(&dquot_srcu, index); 1896bf097aafSJan Kara flush_warnings(warn); 1897884d179dSJan Kara } 1898884d179dSJan Kara EXPORT_SYMBOL(dquot_free_inode); 1899884d179dSJan Kara 1900884d179dSJan Kara /* 1901884d179dSJan Kara * Transfer the number of inode and blocks from one diskquota to an other. 1902bc8e5f07SJan Kara * On success, dquot references in transfer_to are consumed and references 1903bc8e5f07SJan Kara * to original dquots that need to be released are placed there. On failure, 1904bc8e5f07SJan Kara * references are kept untouched. 1905884d179dSJan Kara * 1906884d179dSJan Kara * This operation can block, but only after everything is updated 1907884d179dSJan Kara * A transaction must be started when entering this function. 1908bc8e5f07SJan Kara * 1909b9ba6f94SNiu Yawei * We are holding reference on transfer_from & transfer_to, no need to 1910b9ba6f94SNiu Yawei * protect them by srcu_read_lock(). 1911884d179dSJan Kara */ 1912bc8e5f07SJan Kara int __dquot_transfer(struct inode *inode, struct dquot **transfer_to) 1913884d179dSJan Kara { 1914884d179dSJan Kara qsize_t space, cur_space; 1915884d179dSJan Kara qsize_t rsv_space = 0; 19167a9ca53aSTahsin Erdogan qsize_t inode_usage = 1; 1917bc8e5f07SJan Kara struct dquot *transfer_from[MAXQUOTAS] = {}; 1918efd8f0e6SChristoph Hellwig int cnt, ret = 0; 19199e32784bSDmitry char is_valid[MAXQUOTAS] = {}; 1920bf097aafSJan Kara struct dquot_warn warn_to[MAXQUOTAS]; 1921bf097aafSJan Kara struct dquot_warn warn_from_inodes[MAXQUOTAS]; 1922bf097aafSJan Kara struct dquot_warn warn_from_space[MAXQUOTAS]; 1923884d179dSJan Kara 1924884d179dSJan Kara if (IS_NOQUOTA(inode)) 1925efd8f0e6SChristoph Hellwig return 0; 19267a9ca53aSTahsin Erdogan 19277a9ca53aSTahsin Erdogan if (inode->i_sb->dq_op->get_inode_usage) { 19287a9ca53aSTahsin Erdogan ret = inode->i_sb->dq_op->get_inode_usage(inode, &inode_usage); 19297a9ca53aSTahsin Erdogan if (ret) 19307a9ca53aSTahsin Erdogan return ret; 19317a9ca53aSTahsin Erdogan } 19327a9ca53aSTahsin Erdogan 1933884d179dSJan Kara /* Initialize the arrays */ 1934bf097aafSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1935bf097aafSJan Kara warn_to[cnt].w_type = QUOTA_NL_NOWARN; 1936bf097aafSJan Kara warn_from_inodes[cnt].w_type = QUOTA_NL_NOWARN; 1937bf097aafSJan Kara warn_from_space[cnt].w_type = QUOTA_NL_NOWARN; 1938bf097aafSJan Kara } 1939b9ba6f94SNiu Yawei 1940b9ba6f94SNiu Yawei spin_lock(&dq_data_lock); 1941884d179dSJan Kara if (IS_NOQUOTA(inode)) { /* File without quota accounting? */ 1942b9ba6f94SNiu Yawei spin_unlock(&dq_data_lock); 1943bc8e5f07SJan Kara return 0; 1944884d179dSJan Kara } 1945884d179dSJan Kara cur_space = inode_get_bytes(inode); 1946fd8fbfc1SDmitry Monakhov rsv_space = inode_get_rsv_space(inode); 1947884d179dSJan Kara space = cur_space + rsv_space; 1948884d179dSJan Kara /* Build the transfer_from list and check the limits */ 1949884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 19509e32784bSDmitry /* 19519e32784bSDmitry * Skip changes for same uid or gid or for turned off quota-type. 19529e32784bSDmitry */ 1953dd6f3c6dSJan Kara if (!transfer_to[cnt]) 1954884d179dSJan Kara continue; 19559e32784bSDmitry /* Avoid races with quotaoff() */ 19569e32784bSDmitry if (!sb_has_quota_active(inode->i_sb, cnt)) 19579e32784bSDmitry continue; 19589e32784bSDmitry is_valid[cnt] = 1; 19592d0fa467SJan Kara transfer_from[cnt] = i_dquot(inode)[cnt]; 19607a9ca53aSTahsin Erdogan ret = check_idq(transfer_to[cnt], inode_usage, &warn_to[cnt]); 1961efd8f0e6SChristoph Hellwig if (ret) 1962efd8f0e6SChristoph Hellwig goto over_quota; 1963bf097aafSJan Kara ret = check_bdq(transfer_to[cnt], space, 0, &warn_to[cnt]); 1964efd8f0e6SChristoph Hellwig if (ret) 1965884d179dSJan Kara goto over_quota; 1966884d179dSJan Kara } 1967884d179dSJan Kara 1968884d179dSJan Kara /* 1969884d179dSJan Kara * Finally perform the needed transfer from transfer_from to transfer_to 1970884d179dSJan Kara */ 1971884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 19729e32784bSDmitry if (!is_valid[cnt]) 1973884d179dSJan Kara continue; 1974884d179dSJan Kara /* Due to IO error we might not have transfer_from[] structure */ 1975884d179dSJan Kara if (transfer_from[cnt]) { 1976bf097aafSJan Kara int wtype; 19777a9ca53aSTahsin Erdogan wtype = info_idq_free(transfer_from[cnt], inode_usage); 1978bf097aafSJan Kara if (wtype != QUOTA_NL_NOWARN) 1979bf097aafSJan Kara prepare_warning(&warn_from_inodes[cnt], 1980bf097aafSJan Kara transfer_from[cnt], wtype); 1981bf097aafSJan Kara wtype = info_bdq_free(transfer_from[cnt], space); 1982bf097aafSJan Kara if (wtype != QUOTA_NL_NOWARN) 1983bf097aafSJan Kara prepare_warning(&warn_from_space[cnt], 1984bf097aafSJan Kara transfer_from[cnt], wtype); 19857a9ca53aSTahsin Erdogan dquot_decr_inodes(transfer_from[cnt], inode_usage); 1986884d179dSJan Kara dquot_decr_space(transfer_from[cnt], cur_space); 1987884d179dSJan Kara dquot_free_reserved_space(transfer_from[cnt], 1988884d179dSJan Kara rsv_space); 1989884d179dSJan Kara } 1990884d179dSJan Kara 19917a9ca53aSTahsin Erdogan dquot_incr_inodes(transfer_to[cnt], inode_usage); 1992884d179dSJan Kara dquot_incr_space(transfer_to[cnt], cur_space); 1993884d179dSJan Kara dquot_resv_space(transfer_to[cnt], rsv_space); 1994884d179dSJan Kara 19952d0fa467SJan Kara i_dquot(inode)[cnt] = transfer_to[cnt]; 1996884d179dSJan Kara } 1997884d179dSJan Kara spin_unlock(&dq_data_lock); 1998884d179dSJan Kara 1999dc52dd3aSDmitry Monakhov mark_all_dquot_dirty(transfer_from); 2000dc52dd3aSDmitry Monakhov mark_all_dquot_dirty(transfer_to); 2001bf097aafSJan Kara flush_warnings(warn_to); 2002bf097aafSJan Kara flush_warnings(warn_from_inodes); 2003bf097aafSJan Kara flush_warnings(warn_from_space); 2004bc8e5f07SJan Kara /* Pass back references to put */ 2005dc52dd3aSDmitry Monakhov for (cnt = 0; cnt < MAXQUOTAS; cnt++) 20069e32784bSDmitry if (is_valid[cnt]) 2007bc8e5f07SJan Kara transfer_to[cnt] = transfer_from[cnt]; 200886f3cbecSJan Kara return 0; 2009884d179dSJan Kara over_quota: 2010884d179dSJan Kara spin_unlock(&dq_data_lock); 2011bf097aafSJan Kara flush_warnings(warn_to); 201286f3cbecSJan Kara return ret; 2013884d179dSJan Kara } 2014bc8e5f07SJan Kara EXPORT_SYMBOL(__dquot_transfer); 2015884d179dSJan Kara 20168ddd69d6SDmitry Monakhov /* Wrapper for transferring ownership of an inode for uid/gid only 20178ddd69d6SDmitry Monakhov * Called from FSXXX_setattr() 20188ddd69d6SDmitry Monakhov */ 2019b43fa828SChristoph Hellwig int dquot_transfer(struct inode *inode, struct iattr *iattr) 2020884d179dSJan Kara { 2021bc8e5f07SJan Kara struct dquot *transfer_to[MAXQUOTAS] = {}; 20226184fc0bSJan Kara struct dquot *dquot; 2023bc8e5f07SJan Kara struct super_block *sb = inode->i_sb; 2024bc8e5f07SJan Kara int ret; 20258ddd69d6SDmitry Monakhov 2026189eef59SChristoph Hellwig if (!dquot_active(inode)) 2027884d179dSJan Kara return 0; 2028bc8e5f07SJan Kara 20296184fc0bSJan Kara if (iattr->ia_valid & ATTR_UID && !uid_eq(iattr->ia_uid, inode->i_uid)){ 20306184fc0bSJan Kara dquot = dqget(sb, make_kqid_uid(iattr->ia_uid)); 20316184fc0bSJan Kara if (IS_ERR(dquot)) { 20326184fc0bSJan Kara if (PTR_ERR(dquot) != -ESRCH) { 20336184fc0bSJan Kara ret = PTR_ERR(dquot); 20346184fc0bSJan Kara goto out_put; 20356184fc0bSJan Kara } 20366184fc0bSJan Kara dquot = NULL; 20376184fc0bSJan Kara } 20386184fc0bSJan Kara transfer_to[USRQUOTA] = dquot; 20396184fc0bSJan Kara } 20406184fc0bSJan Kara if (iattr->ia_valid & ATTR_GID && !gid_eq(iattr->ia_gid, inode->i_gid)){ 20416184fc0bSJan Kara dquot = dqget(sb, make_kqid_gid(iattr->ia_gid)); 20426184fc0bSJan Kara if (IS_ERR(dquot)) { 20436184fc0bSJan Kara if (PTR_ERR(dquot) != -ESRCH) { 20446184fc0bSJan Kara ret = PTR_ERR(dquot); 20456184fc0bSJan Kara goto out_put; 20466184fc0bSJan Kara } 20476184fc0bSJan Kara dquot = NULL; 20486184fc0bSJan Kara } 20496184fc0bSJan Kara transfer_to[GRPQUOTA] = dquot; 20506184fc0bSJan Kara } 2051bc8e5f07SJan Kara ret = __dquot_transfer(inode, transfer_to); 20526184fc0bSJan Kara out_put: 2053bc8e5f07SJan Kara dqput_all(transfer_to); 2054bc8e5f07SJan Kara return ret; 2055884d179dSJan Kara } 2056b43fa828SChristoph Hellwig EXPORT_SYMBOL(dquot_transfer); 2057884d179dSJan Kara 2058884d179dSJan Kara /* 2059884d179dSJan Kara * Write info of quota file to disk 2060884d179dSJan Kara */ 2061884d179dSJan Kara int dquot_commit_info(struct super_block *sb, int type) 2062884d179dSJan Kara { 2063884d179dSJan Kara int ret; 2064884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 2065884d179dSJan Kara 2066bc8230eeSJan Kara down_write(&dqopt->dqio_sem); 2067884d179dSJan Kara ret = dqopt->ops[type]->write_file_info(sb, type); 2068bc8230eeSJan Kara up_write(&dqopt->dqio_sem); 2069884d179dSJan Kara return ret; 2070884d179dSJan Kara } 2071884d179dSJan Kara EXPORT_SYMBOL(dquot_commit_info); 2072884d179dSJan Kara 2073be6257b2SJan Kara int dquot_get_next_id(struct super_block *sb, struct kqid *qid) 2074be6257b2SJan Kara { 2075be6257b2SJan Kara struct quota_info *dqopt = sb_dqopt(sb); 2076be6257b2SJan Kara int err; 2077be6257b2SJan Kara 20789d1ccbe7SJan Kara if (!sb_has_quota_active(sb, qid->type)) 20799d1ccbe7SJan Kara return -ESRCH; 20809d1ccbe7SJan Kara if (!dqopt->ops[qid->type]->get_next_id) 20819d1ccbe7SJan Kara return -ENOSYS; 2082*0cff9151SJan Kara down_read(&dqopt->dqio_sem); 2083be6257b2SJan Kara err = dqopt->ops[qid->type]->get_next_id(sb, qid); 2084*0cff9151SJan Kara up_read(&dqopt->dqio_sem); 2085be6257b2SJan Kara return err; 2086be6257b2SJan Kara } 2087be6257b2SJan Kara EXPORT_SYMBOL(dquot_get_next_id); 2088be6257b2SJan Kara 2089884d179dSJan Kara /* 2090884d179dSJan Kara * Definitions of diskquota operations. 2091884d179dSJan Kara */ 209261e225dcSAlexey Dobriyan const struct dquot_operations dquot_operations = { 2093884d179dSJan Kara .write_dquot = dquot_commit, 2094884d179dSJan Kara .acquire_dquot = dquot_acquire, 2095884d179dSJan Kara .release_dquot = dquot_release, 2096884d179dSJan Kara .mark_dirty = dquot_mark_dquot_dirty, 2097884d179dSJan Kara .write_info = dquot_commit_info, 2098884d179dSJan Kara .alloc_dquot = dquot_alloc, 2099884d179dSJan Kara .destroy_dquot = dquot_destroy, 2100be6257b2SJan Kara .get_next_id = dquot_get_next_id, 2101884d179dSJan Kara }; 2102123e9cafSChristoph Hellwig EXPORT_SYMBOL(dquot_operations); 2103884d179dSJan Kara 2104884d179dSJan Kara /* 2105907f4554SChristoph Hellwig * Generic helper for ->open on filesystems supporting disk quotas. 2106907f4554SChristoph Hellwig */ 2107907f4554SChristoph Hellwig int dquot_file_open(struct inode *inode, struct file *file) 2108907f4554SChristoph Hellwig { 2109907f4554SChristoph Hellwig int error; 2110907f4554SChristoph Hellwig 2111907f4554SChristoph Hellwig error = generic_file_open(inode, file); 2112907f4554SChristoph Hellwig if (!error && (file->f_mode & FMODE_WRITE)) 2113871a2931SChristoph Hellwig dquot_initialize(inode); 2114907f4554SChristoph Hellwig return error; 2115907f4554SChristoph Hellwig } 2116907f4554SChristoph Hellwig EXPORT_SYMBOL(dquot_file_open); 2117907f4554SChristoph Hellwig 2118907f4554SChristoph Hellwig /* 2119884d179dSJan Kara * Turn quota off on a device. type == -1 ==> quotaoff for all types (umount) 2120884d179dSJan Kara */ 21210f0dd62fSChristoph Hellwig int dquot_disable(struct super_block *sb, int type, unsigned int flags) 2122884d179dSJan Kara { 2123884d179dSJan Kara int cnt, ret = 0; 2124884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 2125884d179dSJan Kara struct inode *toputinode[MAXQUOTAS]; 2126884d179dSJan Kara 21277d6cd73dSJan Kara /* s_umount should be held in exclusive mode */ 21287d6cd73dSJan Kara if (WARN_ON_ONCE(down_read_trylock(&sb->s_umount))) 21297d6cd73dSJan Kara up_read(&sb->s_umount); 21307d6cd73dSJan Kara 2131884d179dSJan Kara /* Cannot turn off usage accounting without turning off limits, or 2132884d179dSJan Kara * suspend quotas and simultaneously turn quotas off. */ 2133884d179dSJan Kara if ((flags & DQUOT_USAGE_ENABLED && !(flags & DQUOT_LIMITS_ENABLED)) 2134884d179dSJan Kara || (flags & DQUOT_SUSPENDED && flags & (DQUOT_LIMITS_ENABLED | 2135884d179dSJan Kara DQUOT_USAGE_ENABLED))) 2136884d179dSJan Kara return -EINVAL; 2137884d179dSJan Kara 2138884d179dSJan Kara /* 2139884d179dSJan Kara * Skip everything if there's nothing to do. We have to do this because 2140884d179dSJan Kara * sometimes we are called when fill_super() failed and calling 2141884d179dSJan Kara * sync_fs() in such cases does no good. 2142884d179dSJan Kara */ 2143c3b00446SJan Kara if (!sb_any_quota_loaded(sb)) 2144884d179dSJan Kara return 0; 2145c3b00446SJan Kara 2146884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 2147884d179dSJan Kara toputinode[cnt] = NULL; 2148884d179dSJan Kara if (type != -1 && cnt != type) 2149884d179dSJan Kara continue; 2150884d179dSJan Kara if (!sb_has_quota_loaded(sb, cnt)) 2151884d179dSJan Kara continue; 2152884d179dSJan Kara 2153884d179dSJan Kara if (flags & DQUOT_SUSPENDED) { 2154884d179dSJan Kara spin_lock(&dq_state_lock); 2155884d179dSJan Kara dqopt->flags |= 2156884d179dSJan Kara dquot_state_flag(DQUOT_SUSPENDED, cnt); 2157884d179dSJan Kara spin_unlock(&dq_state_lock); 2158884d179dSJan Kara } else { 2159884d179dSJan Kara spin_lock(&dq_state_lock); 2160884d179dSJan Kara dqopt->flags &= ~dquot_state_flag(flags, cnt); 2161884d179dSJan Kara /* Turning off suspended quotas? */ 2162884d179dSJan Kara if (!sb_has_quota_loaded(sb, cnt) && 2163884d179dSJan Kara sb_has_quota_suspended(sb, cnt)) { 2164884d179dSJan Kara dqopt->flags &= ~dquot_state_flag( 2165884d179dSJan Kara DQUOT_SUSPENDED, cnt); 2166884d179dSJan Kara spin_unlock(&dq_state_lock); 2167884d179dSJan Kara iput(dqopt->files[cnt]); 2168884d179dSJan Kara dqopt->files[cnt] = NULL; 2169884d179dSJan Kara continue; 2170884d179dSJan Kara } 2171884d179dSJan Kara spin_unlock(&dq_state_lock); 2172884d179dSJan Kara } 2173884d179dSJan Kara 2174884d179dSJan Kara /* We still have to keep quota loaded? */ 2175884d179dSJan Kara if (sb_has_quota_loaded(sb, cnt) && !(flags & DQUOT_SUSPENDED)) 2176884d179dSJan Kara continue; 2177884d179dSJan Kara 2178884d179dSJan Kara /* Note: these are blocking operations */ 2179884d179dSJan Kara drop_dquot_ref(sb, cnt); 2180884d179dSJan Kara invalidate_dquots(sb, cnt); 2181884d179dSJan Kara /* 2182268157baSJan Kara * Now all dquots should be invalidated, all writes done so we 2183268157baSJan Kara * should be only users of the info. No locks needed. 2184884d179dSJan Kara */ 2185884d179dSJan Kara if (info_dirty(&dqopt->info[cnt])) 2186884d179dSJan Kara sb->dq_op->write_info(sb, cnt); 2187884d179dSJan Kara if (dqopt->ops[cnt]->free_file_info) 2188884d179dSJan Kara dqopt->ops[cnt]->free_file_info(sb, cnt); 2189884d179dSJan Kara put_quota_format(dqopt->info[cnt].dqi_format); 2190884d179dSJan Kara 2191884d179dSJan Kara toputinode[cnt] = dqopt->files[cnt]; 2192884d179dSJan Kara if (!sb_has_quota_loaded(sb, cnt)) 2193884d179dSJan Kara dqopt->files[cnt] = NULL; 2194884d179dSJan Kara dqopt->info[cnt].dqi_flags = 0; 2195884d179dSJan Kara dqopt->info[cnt].dqi_igrace = 0; 2196884d179dSJan Kara dqopt->info[cnt].dqi_bgrace = 0; 2197884d179dSJan Kara dqopt->ops[cnt] = NULL; 2198884d179dSJan Kara } 2199884d179dSJan Kara 2200884d179dSJan Kara /* Skip syncing and setting flags if quota files are hidden */ 2201884d179dSJan Kara if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) 2202884d179dSJan Kara goto put_inodes; 2203884d179dSJan Kara 2204884d179dSJan Kara /* Sync the superblock so that buffers with quota data are written to 2205884d179dSJan Kara * disk (and so userspace sees correct data afterwards). */ 2206884d179dSJan Kara if (sb->s_op->sync_fs) 2207884d179dSJan Kara sb->s_op->sync_fs(sb, 1); 2208884d179dSJan Kara sync_blockdev(sb->s_bdev); 2209884d179dSJan Kara /* Now the quota files are just ordinary files and we can set the 2210884d179dSJan Kara * inode flags back. Moreover we discard the pagecache so that 2211884d179dSJan Kara * userspace sees the writes we did bypassing the pagecache. We 2212884d179dSJan Kara * must also discard the blockdev buffers so that we see the 2213884d179dSJan Kara * changes done by userspace on the next quotaon() */ 2214884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 22152700e606SJan Kara /* This can happen when suspending quotas on remount-ro... */ 22162700e606SJan Kara if (toputinode[cnt] && !sb_has_quota_loaded(sb, cnt)) { 22175955102cSAl Viro inode_lock(toputinode[cnt]); 2218aad6cde9SJan Kara toputinode[cnt]->i_flags &= ~S_NOQUOTA; 2219c3b00446SJan Kara truncate_inode_pages(&toputinode[cnt]->i_data, 0); 22205955102cSAl Viro inode_unlock(toputinode[cnt]); 222143d2932dSJan Kara mark_inode_dirty_sync(toputinode[cnt]); 2222884d179dSJan Kara } 2223884d179dSJan Kara if (sb->s_bdev) 2224884d179dSJan Kara invalidate_bdev(sb->s_bdev); 2225884d179dSJan Kara put_inodes: 2226884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 2227884d179dSJan Kara if (toputinode[cnt]) { 2228884d179dSJan Kara /* On remount RO, we keep the inode pointer so that we 2229884d179dSJan Kara * can reenable quota on the subsequent remount RW. We 2230884d179dSJan Kara * have to check 'flags' variable and not use sb_has_ 2231884d179dSJan Kara * function because another quotaon / quotaoff could 2232884d179dSJan Kara * change global state before we got here. We refuse 2233884d179dSJan Kara * to suspend quotas when there is pending delete on 2234884d179dSJan Kara * the quota file... */ 2235884d179dSJan Kara if (!(flags & DQUOT_SUSPENDED)) 2236884d179dSJan Kara iput(toputinode[cnt]); 2237884d179dSJan Kara else if (!toputinode[cnt]->i_nlink) 2238884d179dSJan Kara ret = -EBUSY; 2239884d179dSJan Kara } 2240884d179dSJan Kara return ret; 2241884d179dSJan Kara } 22420f0dd62fSChristoph Hellwig EXPORT_SYMBOL(dquot_disable); 2243884d179dSJan Kara 2244287a8095SChristoph Hellwig int dquot_quota_off(struct super_block *sb, int type) 2245884d179dSJan Kara { 22460f0dd62fSChristoph Hellwig return dquot_disable(sb, type, 22470f0dd62fSChristoph Hellwig DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); 2248884d179dSJan Kara } 2249287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_quota_off); 22500f0dd62fSChristoph Hellwig 2251884d179dSJan Kara /* 2252884d179dSJan Kara * Turn quotas on on a device 2253884d179dSJan Kara */ 2254884d179dSJan Kara 2255884d179dSJan Kara /* 2256884d179dSJan Kara * Helper function to turn quotas on when we already have the inode of 2257884d179dSJan Kara * quota file and no quota information is loaded. 2258884d179dSJan Kara */ 2259884d179dSJan Kara static int vfs_load_quota_inode(struct inode *inode, int type, int format_id, 2260884d179dSJan Kara unsigned int flags) 2261884d179dSJan Kara { 2262884d179dSJan Kara struct quota_format_type *fmt = find_quota_format(format_id); 2263884d179dSJan Kara struct super_block *sb = inode->i_sb; 2264884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 2265884d179dSJan Kara int error; 2266884d179dSJan Kara 2267884d179dSJan Kara if (!fmt) 2268884d179dSJan Kara return -ESRCH; 2269884d179dSJan Kara if (!S_ISREG(inode->i_mode)) { 2270884d179dSJan Kara error = -EACCES; 2271884d179dSJan Kara goto out_fmt; 2272884d179dSJan Kara } 2273884d179dSJan Kara if (IS_RDONLY(inode)) { 2274884d179dSJan Kara error = -EROFS; 2275884d179dSJan Kara goto out_fmt; 2276884d179dSJan Kara } 2277847aac64SLi Xi if (!sb->s_op->quota_write || !sb->s_op->quota_read || 2278847aac64SLi Xi (type == PRJQUOTA && sb->dq_op->get_projid == NULL)) { 2279884d179dSJan Kara error = -EINVAL; 2280884d179dSJan Kara goto out_fmt; 2281884d179dSJan Kara } 22825c004828SEric W. Biederman /* Filesystems outside of init_user_ns not yet supported */ 22835c004828SEric W. Biederman if (sb->s_user_ns != &init_user_ns) { 22845c004828SEric W. Biederman error = -EINVAL; 22855c004828SEric W. Biederman goto out_fmt; 22865c004828SEric W. Biederman } 2287884d179dSJan Kara /* Usage always has to be set... */ 2288884d179dSJan Kara if (!(flags & DQUOT_USAGE_ENABLED)) { 2289884d179dSJan Kara error = -EINVAL; 2290884d179dSJan Kara goto out_fmt; 2291884d179dSJan Kara } 2292c3b00446SJan Kara if (sb_has_quota_loaded(sb, type)) { 2293c3b00446SJan Kara error = -EBUSY; 2294c3b00446SJan Kara goto out_fmt; 2295c3b00446SJan Kara } 2296884d179dSJan Kara 2297884d179dSJan Kara if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) { 2298ab94c39bSJan Kara /* As we bypass the pagecache we must now flush all the 2299ab94c39bSJan Kara * dirty data and invalidate caches so that kernel sees 2300ab94c39bSJan Kara * changes from userspace. It is not enough to just flush 2301ab94c39bSJan Kara * the quota file since if blocksize < pagesize, invalidation 2302ab94c39bSJan Kara * of the cache could fail because of other unrelated dirty 2303ab94c39bSJan Kara * data */ 2304ab94c39bSJan Kara sync_filesystem(sb); 2305884d179dSJan Kara invalidate_bdev(sb->s_bdev); 2306884d179dSJan Kara } 2307884d179dSJan Kara 2308884d179dSJan Kara if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) { 2309884d179dSJan Kara /* We don't want quota and atime on quota files (deadlocks 2310884d179dSJan Kara * possible) Also nobody should write to the file - we use 2311884d179dSJan Kara * special IO operations which ignore the immutable bit. */ 23125955102cSAl Viro inode_lock(inode); 2313aad6cde9SJan Kara inode->i_flags |= S_NOQUOTA; 23145955102cSAl Viro inode_unlock(inode); 231526245c94SJan Kara /* 231626245c94SJan Kara * When S_NOQUOTA is set, remove dquot references as no more 231726245c94SJan Kara * references can be added 231826245c94SJan Kara */ 23199f754758SChristoph Hellwig __dquot_drop(inode); 2320884d179dSJan Kara } 2321884d179dSJan Kara 2322884d179dSJan Kara error = -EIO; 2323884d179dSJan Kara dqopt->files[type] = igrab(inode); 2324884d179dSJan Kara if (!dqopt->files[type]) 2325c3b00446SJan Kara goto out_file_flags; 2326884d179dSJan Kara error = -EINVAL; 2327884d179dSJan Kara if (!fmt->qf_ops->check_quota_file(sb, type)) 2328884d179dSJan Kara goto out_file_init; 2329884d179dSJan Kara 2330884d179dSJan Kara dqopt->ops[type] = fmt->qf_ops; 2331884d179dSJan Kara dqopt->info[type].dqi_format = fmt; 2332884d179dSJan Kara dqopt->info[type].dqi_fmt_id = format_id; 2333884d179dSJan Kara INIT_LIST_HEAD(&dqopt->info[type].dqi_dirty_list); 2334bc8230eeSJan Kara down_write(&dqopt->dqio_sem); 2335268157baSJan Kara error = dqopt->ops[type]->read_file_info(sb, type); 2336268157baSJan Kara if (error < 0) { 2337bc8230eeSJan Kara up_write(&dqopt->dqio_sem); 2338884d179dSJan Kara goto out_file_init; 2339884d179dSJan Kara } 234046fe44ceSJan Kara if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) 234146fe44ceSJan Kara dqopt->info[type].dqi_flags |= DQF_SYS_FILE; 2342bc8230eeSJan Kara up_write(&dqopt->dqio_sem); 2343884d179dSJan Kara spin_lock(&dq_state_lock); 2344884d179dSJan Kara dqopt->flags |= dquot_state_flag(flags, type); 2345884d179dSJan Kara spin_unlock(&dq_state_lock); 2346884d179dSJan Kara 2347884d179dSJan Kara add_dquot_ref(sb, type); 2348884d179dSJan Kara 2349884d179dSJan Kara return 0; 2350884d179dSJan Kara 2351884d179dSJan Kara out_file_init: 2352884d179dSJan Kara dqopt->files[type] = NULL; 2353884d179dSJan Kara iput(inode); 2354c3b00446SJan Kara out_file_flags: 23555955102cSAl Viro inode_lock(inode); 2356aad6cde9SJan Kara inode->i_flags &= ~S_NOQUOTA; 23575955102cSAl Viro inode_unlock(inode); 2358884d179dSJan Kara out_fmt: 2359884d179dSJan Kara put_quota_format(fmt); 2360884d179dSJan Kara 2361884d179dSJan Kara return error; 2362884d179dSJan Kara } 2363884d179dSJan Kara 2364884d179dSJan Kara /* Reenable quotas on remount RW */ 23650f0dd62fSChristoph Hellwig int dquot_resume(struct super_block *sb, int type) 2366884d179dSJan Kara { 2367884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 2368884d179dSJan Kara struct inode *inode; 23690f0dd62fSChristoph Hellwig int ret = 0, cnt; 2370884d179dSJan Kara unsigned int flags; 2371884d179dSJan Kara 23727d6cd73dSJan Kara /* s_umount should be held in exclusive mode */ 23737d6cd73dSJan Kara if (WARN_ON_ONCE(down_read_trylock(&sb->s_umount))) 23747d6cd73dSJan Kara up_read(&sb->s_umount); 23757d6cd73dSJan Kara 23760f0dd62fSChristoph Hellwig for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 23770f0dd62fSChristoph Hellwig if (type != -1 && cnt != type) 23780f0dd62fSChristoph Hellwig continue; 2379c3b00446SJan Kara if (!sb_has_quota_suspended(sb, cnt)) 23800f0dd62fSChristoph Hellwig continue; 2381c3b00446SJan Kara 23820f0dd62fSChristoph Hellwig inode = dqopt->files[cnt]; 23830f0dd62fSChristoph Hellwig dqopt->files[cnt] = NULL; 2384884d179dSJan Kara spin_lock(&dq_state_lock); 2385884d179dSJan Kara flags = dqopt->flags & dquot_state_flag(DQUOT_USAGE_ENABLED | 23860f0dd62fSChristoph Hellwig DQUOT_LIMITS_ENABLED, 23870f0dd62fSChristoph Hellwig cnt); 23880f0dd62fSChristoph Hellwig dqopt->flags &= ~dquot_state_flag(DQUOT_STATE_FLAGS, cnt); 2389884d179dSJan Kara spin_unlock(&dq_state_lock); 2390884d179dSJan Kara 23910f0dd62fSChristoph Hellwig flags = dquot_generic_flag(flags, cnt); 23920f0dd62fSChristoph Hellwig ret = vfs_load_quota_inode(inode, cnt, 23930f0dd62fSChristoph Hellwig dqopt->info[cnt].dqi_fmt_id, flags); 2394884d179dSJan Kara iput(inode); 23950f0dd62fSChristoph Hellwig } 2396884d179dSJan Kara 2397884d179dSJan Kara return ret; 2398884d179dSJan Kara } 23990f0dd62fSChristoph Hellwig EXPORT_SYMBOL(dquot_resume); 2400884d179dSJan Kara 2401f00c9e44SJan Kara int dquot_quota_on(struct super_block *sb, int type, int format_id, 24028c54ca9cSAl Viro const struct path *path) 2403884d179dSJan Kara { 2404884d179dSJan Kara int error = security_quota_on(path->dentry); 2405884d179dSJan Kara if (error) 2406884d179dSJan Kara return error; 2407884d179dSJan Kara /* Quota file not on the same filesystem? */ 2408d8c9584eSAl Viro if (path->dentry->d_sb != sb) 2409884d179dSJan Kara error = -EXDEV; 2410884d179dSJan Kara else 2411dea655c2SDavid Howells error = vfs_load_quota_inode(d_inode(path->dentry), type, 2412884d179dSJan Kara format_id, DQUOT_USAGE_ENABLED | 2413884d179dSJan Kara DQUOT_LIMITS_ENABLED); 2414884d179dSJan Kara return error; 2415884d179dSJan Kara } 2416287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_quota_on); 2417884d179dSJan Kara 2418884d179dSJan Kara /* 2419884d179dSJan Kara * More powerful function for turning on quotas allowing setting 2420884d179dSJan Kara * of individual quota flags 2421884d179dSJan Kara */ 2422287a8095SChristoph Hellwig int dquot_enable(struct inode *inode, int type, int format_id, 2423884d179dSJan Kara unsigned int flags) 2424884d179dSJan Kara { 2425884d179dSJan Kara struct super_block *sb = inode->i_sb; 2426884d179dSJan Kara 2427884d179dSJan Kara /* Just unsuspend quotas? */ 24280f0dd62fSChristoph Hellwig BUG_ON(flags & DQUOT_SUSPENDED); 24297d6cd73dSJan Kara /* s_umount should be held in exclusive mode */ 24307d6cd73dSJan Kara if (WARN_ON_ONCE(down_read_trylock(&sb->s_umount))) 24317d6cd73dSJan Kara up_read(&sb->s_umount); 24320f0dd62fSChristoph Hellwig 2433884d179dSJan Kara if (!flags) 2434884d179dSJan Kara return 0; 2435884d179dSJan Kara /* Just updating flags needed? */ 2436884d179dSJan Kara if (sb_has_quota_loaded(sb, type)) { 2437884d179dSJan Kara if (flags & DQUOT_USAGE_ENABLED && 2438c3b00446SJan Kara sb_has_quota_usage_enabled(sb, type)) 2439c3b00446SJan Kara return -EBUSY; 2440884d179dSJan Kara if (flags & DQUOT_LIMITS_ENABLED && 2441c3b00446SJan Kara sb_has_quota_limits_enabled(sb, type)) 2442c3b00446SJan Kara return -EBUSY; 2443884d179dSJan Kara spin_lock(&dq_state_lock); 2444884d179dSJan Kara sb_dqopt(sb)->flags |= dquot_state_flag(flags, type); 2445884d179dSJan Kara spin_unlock(&dq_state_lock); 2446c3b00446SJan Kara return 0; 2447884d179dSJan Kara } 2448884d179dSJan Kara 2449884d179dSJan Kara return vfs_load_quota_inode(inode, type, format_id, flags); 2450884d179dSJan Kara } 2451287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_enable); 2452884d179dSJan Kara 2453884d179dSJan Kara /* 2454884d179dSJan Kara * This function is used when filesystem needs to initialize quotas 2455884d179dSJan Kara * during mount time. 2456884d179dSJan Kara */ 2457287a8095SChristoph Hellwig int dquot_quota_on_mount(struct super_block *sb, char *qf_name, 2458884d179dSJan Kara int format_id, int type) 2459884d179dSJan Kara { 2460884d179dSJan Kara struct dentry *dentry; 2461884d179dSJan Kara int error; 2462884d179dSJan Kara 2463e12a4e8aSAl Viro dentry = lookup_one_len_unlocked(qf_name, sb->s_root, strlen(qf_name)); 2464884d179dSJan Kara if (IS_ERR(dentry)) 2465884d179dSJan Kara return PTR_ERR(dentry); 2466884d179dSJan Kara 2467dea655c2SDavid Howells if (d_really_is_negative(dentry)) { 2468884d179dSJan Kara error = -ENOENT; 2469884d179dSJan Kara goto out; 2470884d179dSJan Kara } 2471884d179dSJan Kara 2472884d179dSJan Kara error = security_quota_on(dentry); 2473884d179dSJan Kara if (!error) 2474dea655c2SDavid Howells error = vfs_load_quota_inode(d_inode(dentry), type, format_id, 2475884d179dSJan Kara DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); 2476884d179dSJan Kara 2477884d179dSJan Kara out: 2478884d179dSJan Kara dput(dentry); 2479884d179dSJan Kara return error; 2480884d179dSJan Kara } 2481287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_quota_on_mount); 2482884d179dSJan Kara 24833e2af67eSJan Kara static int dquot_quota_enable(struct super_block *sb, unsigned int flags) 24843e2af67eSJan Kara { 24853e2af67eSJan Kara int ret; 24863e2af67eSJan Kara int type; 24873e2af67eSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 24883e2af67eSJan Kara 24893e2af67eSJan Kara if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) 24903e2af67eSJan Kara return -ENOSYS; 24913e2af67eSJan Kara /* Accounting cannot be turned on while fs is mounted */ 24923e2af67eSJan Kara flags &= ~(FS_QUOTA_UDQ_ACCT | FS_QUOTA_GDQ_ACCT | FS_QUOTA_PDQ_ACCT); 24933e2af67eSJan Kara if (!flags) 24943e2af67eSJan Kara return -EINVAL; 24953e2af67eSJan Kara for (type = 0; type < MAXQUOTAS; type++) { 24963e2af67eSJan Kara if (!(flags & qtype_enforce_flag(type))) 24973e2af67eSJan Kara continue; 24983e2af67eSJan Kara /* Can't enforce without accounting */ 24993e2af67eSJan Kara if (!sb_has_quota_usage_enabled(sb, type)) 25003e2af67eSJan Kara return -EINVAL; 25013e2af67eSJan Kara ret = dquot_enable(dqopt->files[type], type, 25023e2af67eSJan Kara dqopt->info[type].dqi_fmt_id, 25033e2af67eSJan Kara DQUOT_LIMITS_ENABLED); 25043e2af67eSJan Kara if (ret < 0) 25053e2af67eSJan Kara goto out_err; 25063e2af67eSJan Kara } 25073e2af67eSJan Kara return 0; 25083e2af67eSJan Kara out_err: 25093e2af67eSJan Kara /* Backout enforcement enablement we already did */ 25103e2af67eSJan Kara for (type--; type >= 0; type--) { 25113e2af67eSJan Kara if (flags & qtype_enforce_flag(type)) 25123e2af67eSJan Kara dquot_disable(sb, type, DQUOT_LIMITS_ENABLED); 25133e2af67eSJan Kara } 25143e2af67eSJan Kara /* Error code translation for better compatibility with XFS */ 25153e2af67eSJan Kara if (ret == -EBUSY) 25163e2af67eSJan Kara ret = -EEXIST; 25173e2af67eSJan Kara return ret; 25183e2af67eSJan Kara } 25193e2af67eSJan Kara 25203e2af67eSJan Kara static int dquot_quota_disable(struct super_block *sb, unsigned int flags) 25213e2af67eSJan Kara { 25223e2af67eSJan Kara int ret; 25233e2af67eSJan Kara int type; 25243e2af67eSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 25253e2af67eSJan Kara 25263e2af67eSJan Kara if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) 25273e2af67eSJan Kara return -ENOSYS; 25283e2af67eSJan Kara /* 25293e2af67eSJan Kara * We don't support turning off accounting via quotactl. In principle 25303e2af67eSJan Kara * quota infrastructure can do this but filesystems don't expect 25313e2af67eSJan Kara * userspace to be able to do it. 25323e2af67eSJan Kara */ 25333e2af67eSJan Kara if (flags & 25343e2af67eSJan Kara (FS_QUOTA_UDQ_ACCT | FS_QUOTA_GDQ_ACCT | FS_QUOTA_PDQ_ACCT)) 25353e2af67eSJan Kara return -EOPNOTSUPP; 25363e2af67eSJan Kara 25373e2af67eSJan Kara /* Filter out limits not enabled */ 25383e2af67eSJan Kara for (type = 0; type < MAXQUOTAS; type++) 25393e2af67eSJan Kara if (!sb_has_quota_limits_enabled(sb, type)) 25403e2af67eSJan Kara flags &= ~qtype_enforce_flag(type); 25413e2af67eSJan Kara /* Nothing left? */ 25423e2af67eSJan Kara if (!flags) 25433e2af67eSJan Kara return -EEXIST; 25443e2af67eSJan Kara for (type = 0; type < MAXQUOTAS; type++) { 25453e2af67eSJan Kara if (flags & qtype_enforce_flag(type)) { 25463e2af67eSJan Kara ret = dquot_disable(sb, type, DQUOT_LIMITS_ENABLED); 25473e2af67eSJan Kara if (ret < 0) 25483e2af67eSJan Kara goto out_err; 25493e2af67eSJan Kara } 25503e2af67eSJan Kara } 25513e2af67eSJan Kara return 0; 25523e2af67eSJan Kara out_err: 25533e2af67eSJan Kara /* Backout enforcement disabling we already did */ 25543e2af67eSJan Kara for (type--; type >= 0; type--) { 25553e2af67eSJan Kara if (flags & qtype_enforce_flag(type)) 25563e2af67eSJan Kara dquot_enable(dqopt->files[type], type, 25573e2af67eSJan Kara dqopt->info[type].dqi_fmt_id, 25583e2af67eSJan Kara DQUOT_LIMITS_ENABLED); 25593e2af67eSJan Kara } 25603e2af67eSJan Kara return ret; 25613e2af67eSJan Kara } 25623e2af67eSJan Kara 2563884d179dSJan Kara /* Generic routine for getting common part of quota structure */ 256414bf61ffSJan Kara static void do_get_dqblk(struct dquot *dquot, struct qc_dqblk *di) 2565884d179dSJan Kara { 2566884d179dSJan Kara struct mem_dqblk *dm = &dquot->dq_dqb; 2567884d179dSJan Kara 2568b9b2dd36SChristoph Hellwig memset(di, 0, sizeof(*di)); 2569884d179dSJan Kara spin_lock(&dq_data_lock); 257014bf61ffSJan Kara di->d_spc_hardlimit = dm->dqb_bhardlimit; 257114bf61ffSJan Kara di->d_spc_softlimit = dm->dqb_bsoftlimit; 2572b9b2dd36SChristoph Hellwig di->d_ino_hardlimit = dm->dqb_ihardlimit; 2573b9b2dd36SChristoph Hellwig di->d_ino_softlimit = dm->dqb_isoftlimit; 257414bf61ffSJan Kara di->d_space = dm->dqb_curspace + dm->dqb_rsvspace; 257514bf61ffSJan Kara di->d_ino_count = dm->dqb_curinodes; 257614bf61ffSJan Kara di->d_spc_timer = dm->dqb_btime; 257714bf61ffSJan Kara di->d_ino_timer = dm->dqb_itime; 2578884d179dSJan Kara spin_unlock(&dq_data_lock); 2579884d179dSJan Kara } 2580884d179dSJan Kara 258174a8a103SEric W. Biederman int dquot_get_dqblk(struct super_block *sb, struct kqid qid, 258214bf61ffSJan Kara struct qc_dqblk *di) 2583884d179dSJan Kara { 2584884d179dSJan Kara struct dquot *dquot; 2585884d179dSJan Kara 2586aca645a6SEric W. Biederman dquot = dqget(sb, qid); 25876184fc0bSJan Kara if (IS_ERR(dquot)) 25886184fc0bSJan Kara return PTR_ERR(dquot); 2589884d179dSJan Kara do_get_dqblk(dquot, di); 2590884d179dSJan Kara dqput(dquot); 2591884d179dSJan Kara 2592884d179dSJan Kara return 0; 2593884d179dSJan Kara } 2594287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_get_dqblk); 2595884d179dSJan Kara 2596be6257b2SJan Kara int dquot_get_next_dqblk(struct super_block *sb, struct kqid *qid, 2597be6257b2SJan Kara struct qc_dqblk *di) 2598be6257b2SJan Kara { 2599be6257b2SJan Kara struct dquot *dquot; 2600be6257b2SJan Kara int err; 2601be6257b2SJan Kara 2602be6257b2SJan Kara if (!sb->dq_op->get_next_id) 2603be6257b2SJan Kara return -ENOSYS; 2604be6257b2SJan Kara err = sb->dq_op->get_next_id(sb, qid); 2605be6257b2SJan Kara if (err < 0) 2606be6257b2SJan Kara return err; 2607be6257b2SJan Kara dquot = dqget(sb, *qid); 2608be6257b2SJan Kara if (IS_ERR(dquot)) 2609be6257b2SJan Kara return PTR_ERR(dquot); 2610be6257b2SJan Kara do_get_dqblk(dquot, di); 2611be6257b2SJan Kara dqput(dquot); 2612be6257b2SJan Kara 2613be6257b2SJan Kara return 0; 2614be6257b2SJan Kara } 2615be6257b2SJan Kara EXPORT_SYMBOL(dquot_get_next_dqblk); 2616be6257b2SJan Kara 261714bf61ffSJan Kara #define VFS_QC_MASK \ 261814bf61ffSJan Kara (QC_SPACE | QC_SPC_SOFT | QC_SPC_HARD | \ 261914bf61ffSJan Kara QC_INO_COUNT | QC_INO_SOFT | QC_INO_HARD | \ 262014bf61ffSJan Kara QC_SPC_TIMER | QC_INO_TIMER) 2621c472b432SChristoph Hellwig 2622884d179dSJan Kara /* Generic routine for setting common part of quota structure */ 262314bf61ffSJan Kara static int do_set_dqblk(struct dquot *dquot, struct qc_dqblk *di) 2624884d179dSJan Kara { 2625884d179dSJan Kara struct mem_dqblk *dm = &dquot->dq_dqb; 2626884d179dSJan Kara int check_blim = 0, check_ilim = 0; 26274c376dcaSEric W. Biederman struct mem_dqinfo *dqi = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_id.type]; 2628884d179dSJan Kara 262914bf61ffSJan Kara if (di->d_fieldmask & ~VFS_QC_MASK) 2630c472b432SChristoph Hellwig return -EINVAL; 2631c472b432SChristoph Hellwig 263214bf61ffSJan Kara if (((di->d_fieldmask & QC_SPC_SOFT) && 2633b10a0819SJan Kara di->d_spc_softlimit > dqi->dqi_max_spc_limit) || 263414bf61ffSJan Kara ((di->d_fieldmask & QC_SPC_HARD) && 2635b10a0819SJan Kara di->d_spc_hardlimit > dqi->dqi_max_spc_limit) || 263614bf61ffSJan Kara ((di->d_fieldmask & QC_INO_SOFT) && 2637b10a0819SJan Kara (di->d_ino_softlimit > dqi->dqi_max_ino_limit)) || 263814bf61ffSJan Kara ((di->d_fieldmask & QC_INO_HARD) && 2639b10a0819SJan Kara (di->d_ino_hardlimit > dqi->dqi_max_ino_limit))) 2640884d179dSJan Kara return -ERANGE; 2641884d179dSJan Kara 2642884d179dSJan Kara spin_lock(&dq_data_lock); 264314bf61ffSJan Kara if (di->d_fieldmask & QC_SPACE) { 264414bf61ffSJan Kara dm->dqb_curspace = di->d_space - dm->dqb_rsvspace; 2645884d179dSJan Kara check_blim = 1; 264608261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags); 2647884d179dSJan Kara } 2648c472b432SChristoph Hellwig 264914bf61ffSJan Kara if (di->d_fieldmask & QC_SPC_SOFT) 265014bf61ffSJan Kara dm->dqb_bsoftlimit = di->d_spc_softlimit; 265114bf61ffSJan Kara if (di->d_fieldmask & QC_SPC_HARD) 265214bf61ffSJan Kara dm->dqb_bhardlimit = di->d_spc_hardlimit; 265314bf61ffSJan Kara if (di->d_fieldmask & (QC_SPC_SOFT | QC_SPC_HARD)) { 2654884d179dSJan Kara check_blim = 1; 265508261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags); 2656884d179dSJan Kara } 2657c472b432SChristoph Hellwig 265814bf61ffSJan Kara if (di->d_fieldmask & QC_INO_COUNT) { 265914bf61ffSJan Kara dm->dqb_curinodes = di->d_ino_count; 2660884d179dSJan Kara check_ilim = 1; 266108261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags); 2662884d179dSJan Kara } 2663c472b432SChristoph Hellwig 266414bf61ffSJan Kara if (di->d_fieldmask & QC_INO_SOFT) 2665c472b432SChristoph Hellwig dm->dqb_isoftlimit = di->d_ino_softlimit; 266614bf61ffSJan Kara if (di->d_fieldmask & QC_INO_HARD) 2667c472b432SChristoph Hellwig dm->dqb_ihardlimit = di->d_ino_hardlimit; 266814bf61ffSJan Kara if (di->d_fieldmask & (QC_INO_SOFT | QC_INO_HARD)) { 2669884d179dSJan Kara check_ilim = 1; 267008261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags); 2671884d179dSJan Kara } 2672c472b432SChristoph Hellwig 267314bf61ffSJan Kara if (di->d_fieldmask & QC_SPC_TIMER) { 267414bf61ffSJan Kara dm->dqb_btime = di->d_spc_timer; 2675884d179dSJan Kara check_blim = 1; 267608261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags); 2677884d179dSJan Kara } 2678c472b432SChristoph Hellwig 267914bf61ffSJan Kara if (di->d_fieldmask & QC_INO_TIMER) { 268014bf61ffSJan Kara dm->dqb_itime = di->d_ino_timer; 2681884d179dSJan Kara check_ilim = 1; 268208261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags); 2683884d179dSJan Kara } 2684884d179dSJan Kara 2685884d179dSJan Kara if (check_blim) { 2686268157baSJan Kara if (!dm->dqb_bsoftlimit || 2687268157baSJan Kara dm->dqb_curspace < dm->dqb_bsoftlimit) { 2688884d179dSJan Kara dm->dqb_btime = 0; 2689884d179dSJan Kara clear_bit(DQ_BLKS_B, &dquot->dq_flags); 269014bf61ffSJan Kara } else if (!(di->d_fieldmask & QC_SPC_TIMER)) 2691268157baSJan Kara /* Set grace only if user hasn't provided his own... */ 2692e008bb61SArnd Bergmann dm->dqb_btime = ktime_get_real_seconds() + dqi->dqi_bgrace; 2693884d179dSJan Kara } 2694884d179dSJan Kara if (check_ilim) { 2695268157baSJan Kara if (!dm->dqb_isoftlimit || 2696268157baSJan Kara dm->dqb_curinodes < dm->dqb_isoftlimit) { 2697884d179dSJan Kara dm->dqb_itime = 0; 2698884d179dSJan Kara clear_bit(DQ_INODES_B, &dquot->dq_flags); 269914bf61ffSJan Kara } else if (!(di->d_fieldmask & QC_INO_TIMER)) 2700268157baSJan Kara /* Set grace only if user hasn't provided his own... */ 2701e008bb61SArnd Bergmann dm->dqb_itime = ktime_get_real_seconds() + dqi->dqi_igrace; 2702884d179dSJan Kara } 2703268157baSJan Kara if (dm->dqb_bhardlimit || dm->dqb_bsoftlimit || dm->dqb_ihardlimit || 2704268157baSJan Kara dm->dqb_isoftlimit) 2705884d179dSJan Kara clear_bit(DQ_FAKE_B, &dquot->dq_flags); 2706884d179dSJan Kara else 2707884d179dSJan Kara set_bit(DQ_FAKE_B, &dquot->dq_flags); 2708884d179dSJan Kara spin_unlock(&dq_data_lock); 2709884d179dSJan Kara mark_dquot_dirty(dquot); 2710884d179dSJan Kara 2711884d179dSJan Kara return 0; 2712884d179dSJan Kara } 2713884d179dSJan Kara 271474a8a103SEric W. Biederman int dquot_set_dqblk(struct super_block *sb, struct kqid qid, 271514bf61ffSJan Kara struct qc_dqblk *di) 2716884d179dSJan Kara { 2717884d179dSJan Kara struct dquot *dquot; 2718884d179dSJan Kara int rc; 2719884d179dSJan Kara 2720aca645a6SEric W. Biederman dquot = dqget(sb, qid); 27216184fc0bSJan Kara if (IS_ERR(dquot)) { 27226184fc0bSJan Kara rc = PTR_ERR(dquot); 2723884d179dSJan Kara goto out; 2724884d179dSJan Kara } 2725884d179dSJan Kara rc = do_set_dqblk(dquot, di); 2726884d179dSJan Kara dqput(dquot); 2727884d179dSJan Kara out: 2728884d179dSJan Kara return rc; 2729884d179dSJan Kara } 2730287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_set_dqblk); 2731884d179dSJan Kara 2732884d179dSJan Kara /* Generic routine for getting common part of quota file information */ 27330a240339SJan Kara int dquot_get_state(struct super_block *sb, struct qc_state *state) 2734884d179dSJan Kara { 2735884d179dSJan Kara struct mem_dqinfo *mi; 27360a240339SJan Kara struct qc_type_state *tstate; 27370a240339SJan Kara struct quota_info *dqopt = sb_dqopt(sb); 27380a240339SJan Kara int type; 2739884d179dSJan Kara 27400a240339SJan Kara memset(state, 0, sizeof(*state)); 27410a240339SJan Kara for (type = 0; type < MAXQUOTAS; type++) { 27420a240339SJan Kara if (!sb_has_quota_active(sb, type)) 27430a240339SJan Kara continue; 27440a240339SJan Kara tstate = state->s_state + type; 2745884d179dSJan Kara mi = sb_dqopt(sb)->info + type; 27460a240339SJan Kara tstate->flags = QCI_ACCT_ENABLED; 2747884d179dSJan Kara spin_lock(&dq_data_lock); 27480a240339SJan Kara if (mi->dqi_flags & DQF_SYS_FILE) 27490a240339SJan Kara tstate->flags |= QCI_SYSFILE; 27500a240339SJan Kara if (mi->dqi_flags & DQF_ROOT_SQUASH) 27510a240339SJan Kara tstate->flags |= QCI_ROOT_SQUASH; 27520a240339SJan Kara if (sb_has_quota_limits_enabled(sb, type)) 27530a240339SJan Kara tstate->flags |= QCI_LIMITS_ENFORCED; 27540a240339SJan Kara tstate->spc_timelimit = mi->dqi_bgrace; 27550a240339SJan Kara tstate->ino_timelimit = mi->dqi_igrace; 27560a240339SJan Kara tstate->ino = dqopt->files[type]->i_ino; 27570a240339SJan Kara tstate->blocks = dqopt->files[type]->i_blocks; 27580a240339SJan Kara tstate->nextents = 1; /* We don't know... */ 2759884d179dSJan Kara spin_unlock(&dq_data_lock); 27600a240339SJan Kara } 2761884d179dSJan Kara return 0; 2762884d179dSJan Kara } 27630a240339SJan Kara EXPORT_SYMBOL(dquot_get_state); 2764884d179dSJan Kara 2765884d179dSJan Kara /* Generic routine for setting common part of quota file information */ 27665eacb2acSJan Kara int dquot_set_dqinfo(struct super_block *sb, int type, struct qc_info *ii) 2767884d179dSJan Kara { 2768884d179dSJan Kara struct mem_dqinfo *mi; 2769884d179dSJan Kara int err = 0; 2770884d179dSJan Kara 27715eacb2acSJan Kara if ((ii->i_fieldmask & QC_WARNS_MASK) || 27725eacb2acSJan Kara (ii->i_fieldmask & QC_RT_SPC_TIMER)) 27735eacb2acSJan Kara return -EINVAL; 27749d1ccbe7SJan Kara if (!sb_has_quota_active(sb, type)) 27759d1ccbe7SJan Kara return -ESRCH; 2776884d179dSJan Kara mi = sb_dqopt(sb)->info + type; 27775eacb2acSJan Kara if (ii->i_fieldmask & QC_FLAGS) { 27785eacb2acSJan Kara if ((ii->i_flags & QCI_ROOT_SQUASH && 27799d1ccbe7SJan Kara mi->dqi_format->qf_fmt_id != QFMT_VFS_OLD)) 27809d1ccbe7SJan Kara return -EINVAL; 2781ca6cb091SJan Kara } 2782884d179dSJan Kara spin_lock(&dq_data_lock); 27835eacb2acSJan Kara if (ii->i_fieldmask & QC_SPC_TIMER) 27845eacb2acSJan Kara mi->dqi_bgrace = ii->i_spc_timelimit; 27855eacb2acSJan Kara if (ii->i_fieldmask & QC_INO_TIMER) 27865eacb2acSJan Kara mi->dqi_igrace = ii->i_ino_timelimit; 27875eacb2acSJan Kara if (ii->i_fieldmask & QC_FLAGS) { 27885eacb2acSJan Kara if (ii->i_flags & QCI_ROOT_SQUASH) 27895eacb2acSJan Kara mi->dqi_flags |= DQF_ROOT_SQUASH; 27905eacb2acSJan Kara else 27915eacb2acSJan Kara mi->dqi_flags &= ~DQF_ROOT_SQUASH; 27925eacb2acSJan Kara } 2793884d179dSJan Kara spin_unlock(&dq_data_lock); 2794884d179dSJan Kara mark_info_dirty(sb, type); 2795884d179dSJan Kara /* Force write to disk */ 2796884d179dSJan Kara sb->dq_op->write_info(sb, type); 2797884d179dSJan Kara return err; 2798884d179dSJan Kara } 2799287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_set_dqinfo); 2800884d179dSJan Kara 28013e2af67eSJan Kara const struct quotactl_ops dquot_quotactl_sysfile_ops = { 28023e2af67eSJan Kara .quota_enable = dquot_quota_enable, 28033e2af67eSJan Kara .quota_disable = dquot_quota_disable, 28043e2af67eSJan Kara .quota_sync = dquot_quota_sync, 28050a240339SJan Kara .get_state = dquot_get_state, 28063e2af67eSJan Kara .set_info = dquot_set_dqinfo, 28073e2af67eSJan Kara .get_dqblk = dquot_get_dqblk, 2808be6257b2SJan Kara .get_nextdqblk = dquot_get_next_dqblk, 28093e2af67eSJan Kara .set_dqblk = dquot_set_dqblk 28103e2af67eSJan Kara }; 28113e2af67eSJan Kara EXPORT_SYMBOL(dquot_quotactl_sysfile_ops); 28123e2af67eSJan Kara 2813dde95888SDmitry Monakhov static int do_proc_dqstats(struct ctl_table *table, int write, 2814dde95888SDmitry Monakhov void __user *buffer, size_t *lenp, loff_t *ppos) 2815dde95888SDmitry Monakhov { 2816dde95888SDmitry Monakhov unsigned int type = (int *)table->data - dqstats.stat; 2817f32764bdSDmitry Monakhov 2818f32764bdSDmitry Monakhov /* Update global table */ 2819f32764bdSDmitry Monakhov dqstats.stat[type] = 2820f32764bdSDmitry Monakhov percpu_counter_sum_positive(&dqstats.counter[type]); 2821dde95888SDmitry Monakhov return proc_dointvec(table, write, buffer, lenp, ppos); 2822dde95888SDmitry Monakhov } 2823dde95888SDmitry Monakhov 2824e628753bSJoe Perches static struct ctl_table fs_dqstats_table[] = { 2825884d179dSJan Kara { 2826884d179dSJan Kara .procname = "lookups", 2827dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_LOOKUPS], 2828884d179dSJan Kara .maxlen = sizeof(int), 2829884d179dSJan Kara .mode = 0444, 2830dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2831884d179dSJan Kara }, 2832884d179dSJan Kara { 2833884d179dSJan Kara .procname = "drops", 2834dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_DROPS], 2835884d179dSJan Kara .maxlen = sizeof(int), 2836884d179dSJan Kara .mode = 0444, 2837dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2838884d179dSJan Kara }, 2839884d179dSJan Kara { 2840884d179dSJan Kara .procname = "reads", 2841dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_READS], 2842884d179dSJan Kara .maxlen = sizeof(int), 2843884d179dSJan Kara .mode = 0444, 2844dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2845884d179dSJan Kara }, 2846884d179dSJan Kara { 2847884d179dSJan Kara .procname = "writes", 2848dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_WRITES], 2849884d179dSJan Kara .maxlen = sizeof(int), 2850884d179dSJan Kara .mode = 0444, 2851dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2852884d179dSJan Kara }, 2853884d179dSJan Kara { 2854884d179dSJan Kara .procname = "cache_hits", 2855dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_CACHE_HITS], 2856884d179dSJan Kara .maxlen = sizeof(int), 2857884d179dSJan Kara .mode = 0444, 2858dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2859884d179dSJan Kara }, 2860884d179dSJan Kara { 2861884d179dSJan Kara .procname = "allocated_dquots", 2862dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_ALLOC_DQUOTS], 2863884d179dSJan Kara .maxlen = sizeof(int), 2864884d179dSJan Kara .mode = 0444, 2865dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2866884d179dSJan Kara }, 2867884d179dSJan Kara { 2868884d179dSJan Kara .procname = "free_dquots", 2869dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_FREE_DQUOTS], 2870884d179dSJan Kara .maxlen = sizeof(int), 2871884d179dSJan Kara .mode = 0444, 2872dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2873884d179dSJan Kara }, 2874884d179dSJan Kara { 2875884d179dSJan Kara .procname = "syncs", 2876dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_SYNCS], 2877884d179dSJan Kara .maxlen = sizeof(int), 2878884d179dSJan Kara .mode = 0444, 2879dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2880884d179dSJan Kara }, 2881884d179dSJan Kara #ifdef CONFIG_PRINT_QUOTA_WARNING 2882884d179dSJan Kara { 2883884d179dSJan Kara .procname = "warnings", 2884884d179dSJan Kara .data = &flag_print_warnings, 2885884d179dSJan Kara .maxlen = sizeof(int), 2886884d179dSJan Kara .mode = 0644, 28876d456111SEric W. Biederman .proc_handler = proc_dointvec, 2888884d179dSJan Kara }, 2889884d179dSJan Kara #endif 2890ab09203eSEric W. Biederman { }, 2891884d179dSJan Kara }; 2892884d179dSJan Kara 2893e628753bSJoe Perches static struct ctl_table fs_table[] = { 2894884d179dSJan Kara { 2895884d179dSJan Kara .procname = "quota", 2896884d179dSJan Kara .mode = 0555, 2897884d179dSJan Kara .child = fs_dqstats_table, 2898884d179dSJan Kara }, 2899ab09203eSEric W. Biederman { }, 2900884d179dSJan Kara }; 2901884d179dSJan Kara 2902e628753bSJoe Perches static struct ctl_table sys_table[] = { 2903884d179dSJan Kara { 2904884d179dSJan Kara .procname = "fs", 2905884d179dSJan Kara .mode = 0555, 2906884d179dSJan Kara .child = fs_table, 2907884d179dSJan Kara }, 2908ab09203eSEric W. Biederman { }, 2909884d179dSJan Kara }; 2910884d179dSJan Kara 2911884d179dSJan Kara static int __init dquot_init(void) 2912884d179dSJan Kara { 2913f32764bdSDmitry Monakhov int i, ret; 2914884d179dSJan Kara unsigned long nr_hash, order; 2915884d179dSJan Kara 2916884d179dSJan Kara printk(KERN_NOTICE "VFS: Disk quotas %s\n", __DQUOT_VERSION__); 2917884d179dSJan Kara 2918884d179dSJan Kara register_sysctl_table(sys_table); 2919884d179dSJan Kara 2920884d179dSJan Kara dquot_cachep = kmem_cache_create("dquot", 2921884d179dSJan Kara sizeof(struct dquot), sizeof(unsigned long) * 4, 2922884d179dSJan Kara (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| 2923884d179dSJan Kara SLAB_MEM_SPREAD|SLAB_PANIC), 2924884d179dSJan Kara NULL); 2925884d179dSJan Kara 2926884d179dSJan Kara order = 0; 2927884d179dSJan Kara dquot_hash = (struct hlist_head *)__get_free_pages(GFP_ATOMIC, order); 2928884d179dSJan Kara if (!dquot_hash) 2929884d179dSJan Kara panic("Cannot create dquot hash table"); 2930884d179dSJan Kara 2931f32764bdSDmitry Monakhov for (i = 0; i < _DQST_DQSTAT_LAST; i++) { 2932908c7f19STejun Heo ret = percpu_counter_init(&dqstats.counter[i], 0, GFP_KERNEL); 2933f32764bdSDmitry Monakhov if (ret) 2934f32764bdSDmitry Monakhov panic("Cannot create dquot stat counters"); 2935f32764bdSDmitry Monakhov } 2936dde95888SDmitry Monakhov 2937884d179dSJan Kara /* Find power-of-two hlist_heads which can fit into allocation */ 2938884d179dSJan Kara nr_hash = (1UL << order) * PAGE_SIZE / sizeof(struct hlist_head); 2939884d179dSJan Kara dq_hash_bits = 0; 2940884d179dSJan Kara do { 2941884d179dSJan Kara dq_hash_bits++; 2942884d179dSJan Kara } while (nr_hash >> dq_hash_bits); 2943884d179dSJan Kara dq_hash_bits--; 2944884d179dSJan Kara 2945884d179dSJan Kara nr_hash = 1UL << dq_hash_bits; 2946884d179dSJan Kara dq_hash_mask = nr_hash - 1; 2947884d179dSJan Kara for (i = 0; i < nr_hash; i++) 2948884d179dSJan Kara INIT_HLIST_HEAD(dquot_hash + i); 2949884d179dSJan Kara 295019858e7bSAnton Blanchard pr_info("VFS: Dquot-cache hash table entries: %ld (order %ld," 295119858e7bSAnton Blanchard " %ld bytes)\n", nr_hash, order, (PAGE_SIZE << order)); 2952884d179dSJan Kara 2953884d179dSJan Kara register_shrinker(&dqcache_shrinker); 2954884d179dSJan Kara 2955884d179dSJan Kara return 0; 2956884d179dSJan Kara } 2957331221faSPaul Gortmaker fs_initcall(dquot_init); 2958