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 * 1135e8cb9b6SJan Kara * Each dquot has its dq_lock mutex. Dquot is locked when it is being read to 1145e8cb9b6SJan Kara * memory (or space for it is being allocated) on the first dqget(), when it is 1155e8cb9b6SJan Kara * being written out, and when it is being released on the last dqput(). The 1165e8cb9b6SJan Kara * allocation and release operations are serialized by the dq_lock and by 1175e8cb9b6SJan Kara * checking the use count in dquot_release(). 118884d179dSJan Kara * 119884d179dSJan Kara * Lock ordering (including related VFS locks) is the following: 120bc8230eeSJan Kara * s_umount > i_mutex > journal_lock > dquot->dq_lock > dqio_sem 121884d179dSJan Kara */ 122884d179dSJan Kara 123c516610cSJan Kara static __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_list_lock); 124c516610cSJan Kara static __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_state_lock); 125c516610cSJan Kara __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_data_lock); 126884d179dSJan Kara EXPORT_SYMBOL(dq_data_lock); 127b9ba6f94SNiu Yawei DEFINE_STATIC_SRCU(dquot_srcu); 128884d179dSJan Kara 129*503330f3SJan Kara static DECLARE_WAIT_QUEUE_HEAD(dquot_ref_wq); 130*503330f3SJan Kara 131fb5ffb0eSJiaying Zhang void __quota_error(struct super_block *sb, const char *func, 132fb5ffb0eSJiaying Zhang const char *fmt, ...) 133fb5ffb0eSJiaying Zhang { 134fb5ffb0eSJiaying Zhang if (printk_ratelimit()) { 135055adcbdSJoe Perches va_list args; 136055adcbdSJoe Perches struct va_format vaf; 137055adcbdSJoe Perches 138fb5ffb0eSJiaying Zhang va_start(args, fmt); 139055adcbdSJoe Perches 140055adcbdSJoe Perches vaf.fmt = fmt; 141055adcbdSJoe Perches vaf.va = &args; 142055adcbdSJoe Perches 143055adcbdSJoe Perches printk(KERN_ERR "Quota error (device %s): %s: %pV\n", 144055adcbdSJoe Perches sb->s_id, func, &vaf); 145055adcbdSJoe Perches 146fb5ffb0eSJiaying Zhang va_end(args); 147fb5ffb0eSJiaying Zhang } 148fb5ffb0eSJiaying Zhang } 149fb5ffb0eSJiaying Zhang EXPORT_SYMBOL(__quota_error); 150fb5ffb0eSJiaying Zhang 151da8d1ba2SSergey Senozhatsky #if defined(CONFIG_QUOTA_DEBUG) || defined(CONFIG_PRINT_QUOTA_WARNING) 152884d179dSJan Kara static char *quotatypes[] = INITQFNAMES; 153da8d1ba2SSergey Senozhatsky #endif 154884d179dSJan Kara static struct quota_format_type *quota_formats; /* List of registered formats */ 155884d179dSJan Kara static struct quota_module_name module_names[] = INIT_QUOTA_MODULE_NAMES; 156884d179dSJan Kara 157884d179dSJan Kara /* SLAB cache for dquot structures */ 158884d179dSJan Kara static struct kmem_cache *dquot_cachep; 159884d179dSJan Kara 160884d179dSJan Kara int register_quota_format(struct quota_format_type *fmt) 161884d179dSJan Kara { 162884d179dSJan Kara spin_lock(&dq_list_lock); 163884d179dSJan Kara fmt->qf_next = quota_formats; 164884d179dSJan Kara quota_formats = fmt; 165884d179dSJan Kara spin_unlock(&dq_list_lock); 166884d179dSJan Kara return 0; 167884d179dSJan Kara } 168884d179dSJan Kara EXPORT_SYMBOL(register_quota_format); 169884d179dSJan Kara 170884d179dSJan Kara void unregister_quota_format(struct quota_format_type *fmt) 171884d179dSJan Kara { 172884d179dSJan Kara struct quota_format_type **actqf; 173884d179dSJan Kara 174884d179dSJan Kara spin_lock(&dq_list_lock); 175268157baSJan Kara for (actqf = "a_formats; *actqf && *actqf != fmt; 176268157baSJan Kara actqf = &(*actqf)->qf_next) 177268157baSJan Kara ; 178884d179dSJan Kara if (*actqf) 179884d179dSJan Kara *actqf = (*actqf)->qf_next; 180884d179dSJan Kara spin_unlock(&dq_list_lock); 181884d179dSJan Kara } 182884d179dSJan Kara EXPORT_SYMBOL(unregister_quota_format); 183884d179dSJan Kara 184884d179dSJan Kara static struct quota_format_type *find_quota_format(int id) 185884d179dSJan Kara { 186884d179dSJan Kara struct quota_format_type *actqf; 187884d179dSJan Kara 188884d179dSJan Kara spin_lock(&dq_list_lock); 189268157baSJan Kara for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id; 190268157baSJan Kara actqf = actqf->qf_next) 191268157baSJan Kara ; 192884d179dSJan Kara if (!actqf || !try_module_get(actqf->qf_owner)) { 193884d179dSJan Kara int qm; 194884d179dSJan Kara 195884d179dSJan Kara spin_unlock(&dq_list_lock); 196884d179dSJan Kara 197268157baSJan Kara for (qm = 0; module_names[qm].qm_fmt_id && 198268157baSJan Kara module_names[qm].qm_fmt_id != id; qm++) 199268157baSJan Kara ; 200268157baSJan Kara if (!module_names[qm].qm_fmt_id || 201268157baSJan Kara request_module(module_names[qm].qm_mod_name)) 202884d179dSJan Kara return NULL; 203884d179dSJan Kara 204884d179dSJan Kara spin_lock(&dq_list_lock); 205268157baSJan Kara for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id; 206268157baSJan Kara actqf = actqf->qf_next) 207268157baSJan Kara ; 208884d179dSJan Kara if (actqf && !try_module_get(actqf->qf_owner)) 209884d179dSJan Kara actqf = NULL; 210884d179dSJan Kara } 211884d179dSJan Kara spin_unlock(&dq_list_lock); 212884d179dSJan Kara return actqf; 213884d179dSJan Kara } 214884d179dSJan Kara 215884d179dSJan Kara static void put_quota_format(struct quota_format_type *fmt) 216884d179dSJan Kara { 217884d179dSJan Kara module_put(fmt->qf_owner); 218884d179dSJan Kara } 219884d179dSJan Kara 220884d179dSJan Kara /* 221884d179dSJan Kara * Dquot List Management: 222884d179dSJan Kara * The quota code uses three lists for dquot management: the inuse_list, 223884d179dSJan Kara * free_dquots, and dquot_hash[] array. A single dquot structure may be 224884d179dSJan Kara * on all three lists, depending on its current state. 225884d179dSJan Kara * 226884d179dSJan Kara * All dquots are placed to the end of inuse_list when first created, and this 227884d179dSJan Kara * list is used for invalidate operation, which must look at every dquot. 228884d179dSJan Kara * 229884d179dSJan Kara * Unused dquots (dq_count == 0) are added to the free_dquots list when freed, 230884d179dSJan Kara * and this list is searched whenever we need an available dquot. Dquots are 231884d179dSJan Kara * removed from the list as soon as they are used again, and 232884d179dSJan Kara * dqstats.free_dquots gives the number of dquots on the list. When 233884d179dSJan Kara * dquot is invalidated it's completely released from memory. 234884d179dSJan Kara * 235884d179dSJan Kara * Dquots with a specific identity (device, type and id) are placed on 236884d179dSJan Kara * one of the dquot_hash[] hash chains. The provides an efficient search 237884d179dSJan Kara * mechanism to locate a specific dquot. 238884d179dSJan Kara */ 239884d179dSJan Kara 240884d179dSJan Kara static LIST_HEAD(inuse_list); 241884d179dSJan Kara static LIST_HEAD(free_dquots); 242884d179dSJan Kara static unsigned int dq_hash_bits, dq_hash_mask; 243884d179dSJan Kara static struct hlist_head *dquot_hash; 244884d179dSJan Kara 245884d179dSJan Kara struct dqstats dqstats; 246884d179dSJan Kara EXPORT_SYMBOL(dqstats); 247884d179dSJan Kara 2480a5a9c72SJan Kara static qsize_t inode_get_rsv_space(struct inode *inode); 2496184fc0bSJan Kara static int __dquot_initialize(struct inode *inode, int type); 2500a5a9c72SJan Kara 251884d179dSJan Kara static inline unsigned int 2521a06d420SEric W. Biederman hashfn(const struct super_block *sb, struct kqid qid) 253884d179dSJan Kara { 2541a06d420SEric W. Biederman unsigned int id = from_kqid(&init_user_ns, qid); 2551a06d420SEric W. Biederman int type = qid.type; 256884d179dSJan Kara unsigned long tmp; 257884d179dSJan Kara 258884d179dSJan Kara tmp = (((unsigned long)sb>>L1_CACHE_SHIFT) ^ id) * (MAXQUOTAS - type); 259884d179dSJan Kara return (tmp + (tmp >> dq_hash_bits)) & dq_hash_mask; 260884d179dSJan Kara } 261884d179dSJan Kara 262884d179dSJan Kara /* 263884d179dSJan Kara * Following list functions expect dq_list_lock to be held 264884d179dSJan Kara */ 265884d179dSJan Kara static inline void insert_dquot_hash(struct dquot *dquot) 266884d179dSJan Kara { 267268157baSJan Kara struct hlist_head *head; 2681a06d420SEric W. Biederman head = dquot_hash + hashfn(dquot->dq_sb, dquot->dq_id); 269884d179dSJan Kara hlist_add_head(&dquot->dq_hash, head); 270884d179dSJan Kara } 271884d179dSJan Kara 272884d179dSJan Kara static inline void remove_dquot_hash(struct dquot *dquot) 273884d179dSJan Kara { 274884d179dSJan Kara hlist_del_init(&dquot->dq_hash); 275884d179dSJan Kara } 276884d179dSJan Kara 2777a2435d8SJan Kara static struct dquot *find_dquot(unsigned int hashent, struct super_block *sb, 2781a06d420SEric W. Biederman struct kqid qid) 279884d179dSJan Kara { 280884d179dSJan Kara struct hlist_node *node; 281884d179dSJan Kara struct dquot *dquot; 282884d179dSJan Kara 283884d179dSJan Kara hlist_for_each (node, dquot_hash+hashent) { 284884d179dSJan Kara dquot = hlist_entry(node, struct dquot, dq_hash); 2854c376dcaSEric W. Biederman if (dquot->dq_sb == sb && qid_eq(dquot->dq_id, qid)) 286884d179dSJan Kara return dquot; 287884d179dSJan Kara } 288dd6f3c6dSJan Kara return NULL; 289884d179dSJan Kara } 290884d179dSJan Kara 291884d179dSJan Kara /* Add a dquot to the tail of the free list */ 292884d179dSJan Kara static inline void put_dquot_last(struct dquot *dquot) 293884d179dSJan Kara { 294884d179dSJan Kara list_add_tail(&dquot->dq_free, &free_dquots); 295dde95888SDmitry Monakhov dqstats_inc(DQST_FREE_DQUOTS); 296884d179dSJan Kara } 297884d179dSJan Kara 298884d179dSJan Kara static inline void remove_free_dquot(struct dquot *dquot) 299884d179dSJan Kara { 300884d179dSJan Kara if (list_empty(&dquot->dq_free)) 301884d179dSJan Kara return; 302884d179dSJan Kara list_del_init(&dquot->dq_free); 303dde95888SDmitry Monakhov dqstats_dec(DQST_FREE_DQUOTS); 304884d179dSJan Kara } 305884d179dSJan Kara 306884d179dSJan Kara static inline void put_inuse(struct dquot *dquot) 307884d179dSJan Kara { 308884d179dSJan Kara /* We add to the back of inuse list so we don't have to restart 309884d179dSJan Kara * when traversing this list and we block */ 310884d179dSJan Kara list_add_tail(&dquot->dq_inuse, &inuse_list); 311dde95888SDmitry Monakhov dqstats_inc(DQST_ALLOC_DQUOTS); 312884d179dSJan Kara } 313884d179dSJan Kara 314884d179dSJan Kara static inline void remove_inuse(struct dquot *dquot) 315884d179dSJan Kara { 316dde95888SDmitry Monakhov dqstats_dec(DQST_ALLOC_DQUOTS); 317884d179dSJan Kara list_del(&dquot->dq_inuse); 318884d179dSJan Kara } 319884d179dSJan Kara /* 320884d179dSJan Kara * End of list functions needing dq_list_lock 321884d179dSJan Kara */ 322884d179dSJan Kara 323884d179dSJan Kara static void wait_on_dquot(struct dquot *dquot) 324884d179dSJan Kara { 325884d179dSJan Kara mutex_lock(&dquot->dq_lock); 326884d179dSJan Kara mutex_unlock(&dquot->dq_lock); 327884d179dSJan Kara } 328884d179dSJan Kara 329884d179dSJan Kara static inline int dquot_dirty(struct dquot *dquot) 330884d179dSJan Kara { 331884d179dSJan Kara return test_bit(DQ_MOD_B, &dquot->dq_flags); 332884d179dSJan Kara } 333884d179dSJan Kara 334884d179dSJan Kara static inline int mark_dquot_dirty(struct dquot *dquot) 335884d179dSJan Kara { 336884d179dSJan Kara return dquot->dq_sb->dq_op->mark_dirty(dquot); 337884d179dSJan Kara } 338884d179dSJan Kara 339eabf290dSDmitry Monakhov /* Mark dquot dirty in atomic manner, and return it's old dirty flag state */ 340884d179dSJan Kara int dquot_mark_dquot_dirty(struct dquot *dquot) 341884d179dSJan Kara { 342eabf290dSDmitry Monakhov int ret = 1; 343eabf290dSDmitry Monakhov 3444580b30eSJan Kara if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) 3454580b30eSJan Kara return 0; 3464580b30eSJan Kara 347eabf290dSDmitry Monakhov /* If quota is dirty already, we don't have to acquire dq_list_lock */ 348eabf290dSDmitry Monakhov if (test_bit(DQ_MOD_B, &dquot->dq_flags)) 349eabf290dSDmitry Monakhov return 1; 350eabf290dSDmitry Monakhov 351884d179dSJan Kara spin_lock(&dq_list_lock); 352eabf290dSDmitry Monakhov if (!test_and_set_bit(DQ_MOD_B, &dquot->dq_flags)) { 353884d179dSJan Kara list_add(&dquot->dq_dirty, &sb_dqopt(dquot->dq_sb)-> 3544c376dcaSEric W. Biederman info[dquot->dq_id.type].dqi_dirty_list); 355eabf290dSDmitry Monakhov ret = 0; 356eabf290dSDmitry Monakhov } 357884d179dSJan Kara spin_unlock(&dq_list_lock); 358eabf290dSDmitry Monakhov return ret; 359884d179dSJan Kara } 360884d179dSJan Kara EXPORT_SYMBOL(dquot_mark_dquot_dirty); 361884d179dSJan Kara 362dc52dd3aSDmitry Monakhov /* Dirtify all the dquots - this can block when journalling */ 363dc52dd3aSDmitry Monakhov static inline int mark_all_dquot_dirty(struct dquot * const *dquot) 364dc52dd3aSDmitry Monakhov { 365dc52dd3aSDmitry Monakhov int ret, err, cnt; 366dc52dd3aSDmitry Monakhov 367dc52dd3aSDmitry Monakhov ret = err = 0; 368dc52dd3aSDmitry Monakhov for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 369dc52dd3aSDmitry Monakhov if (dquot[cnt]) 370dc52dd3aSDmitry Monakhov /* Even in case of error we have to continue */ 371dc52dd3aSDmitry Monakhov ret = mark_dquot_dirty(dquot[cnt]); 372dc52dd3aSDmitry Monakhov if (!err) 373dc52dd3aSDmitry Monakhov err = ret; 374dc52dd3aSDmitry Monakhov } 375dc52dd3aSDmitry Monakhov return err; 376dc52dd3aSDmitry Monakhov } 377dc52dd3aSDmitry Monakhov 378dc52dd3aSDmitry Monakhov static inline void dqput_all(struct dquot **dquot) 379dc52dd3aSDmitry Monakhov { 380dc52dd3aSDmitry Monakhov unsigned int cnt; 381dc52dd3aSDmitry Monakhov 382dc52dd3aSDmitry Monakhov for (cnt = 0; cnt < MAXQUOTAS; cnt++) 383dc52dd3aSDmitry Monakhov dqput(dquot[cnt]); 384dc52dd3aSDmitry Monakhov } 385dc52dd3aSDmitry Monakhov 386884d179dSJan Kara static inline int clear_dquot_dirty(struct dquot *dquot) 387884d179dSJan Kara { 3881e0b7cb0SJan Kara spin_lock(&dq_list_lock); 3891e0b7cb0SJan Kara if (!test_and_clear_bit(DQ_MOD_B, &dquot->dq_flags)) { 3901e0b7cb0SJan Kara spin_unlock(&dq_list_lock); 391884d179dSJan Kara return 0; 3921e0b7cb0SJan Kara } 393884d179dSJan Kara list_del_init(&dquot->dq_dirty); 3941e0b7cb0SJan Kara spin_unlock(&dq_list_lock); 395884d179dSJan Kara return 1; 396884d179dSJan Kara } 397884d179dSJan Kara 398884d179dSJan Kara void mark_info_dirty(struct super_block *sb, int type) 399884d179dSJan Kara { 40015512377SJan Kara spin_lock(&dq_data_lock); 40115512377SJan Kara sb_dqopt(sb)->info[type].dqi_flags |= DQF_INFO_DIRTY; 40215512377SJan Kara spin_unlock(&dq_data_lock); 403884d179dSJan Kara } 404884d179dSJan Kara EXPORT_SYMBOL(mark_info_dirty); 405884d179dSJan Kara 406884d179dSJan Kara /* 407884d179dSJan Kara * Read dquot from disk and alloc space for it 408884d179dSJan Kara */ 409884d179dSJan Kara 410884d179dSJan Kara int dquot_acquire(struct dquot *dquot) 411884d179dSJan Kara { 412884d179dSJan Kara int ret = 0, ret2 = 0; 413884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); 414884d179dSJan Kara 415884d179dSJan Kara mutex_lock(&dquot->dq_lock); 416e342e38dSJan Kara if (!test_bit(DQ_READ_B, &dquot->dq_flags)) 4174c376dcaSEric W. Biederman ret = dqopt->ops[dquot->dq_id.type]->read_dqblk(dquot); 418884d179dSJan Kara if (ret < 0) 419884d179dSJan Kara goto out_iolock; 420044c9b67SJan Kara /* Make sure flags update is visible after dquot has been filled */ 421044c9b67SJan Kara smp_mb__before_atomic(); 422884d179dSJan Kara set_bit(DQ_READ_B, &dquot->dq_flags); 423884d179dSJan Kara /* Instantiate dquot if needed */ 424884d179dSJan Kara if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && !dquot->dq_off) { 4254c376dcaSEric W. Biederman ret = dqopt->ops[dquot->dq_id.type]->commit_dqblk(dquot); 426884d179dSJan Kara /* Write the info if needed */ 4274c376dcaSEric W. Biederman if (info_dirty(&dqopt->info[dquot->dq_id.type])) { 4284c376dcaSEric W. Biederman ret2 = dqopt->ops[dquot->dq_id.type]->write_file_info( 4294c376dcaSEric W. Biederman dquot->dq_sb, dquot->dq_id.type); 4308fc32c2bSJan Kara } 431884d179dSJan Kara if (ret < 0) 432884d179dSJan Kara goto out_iolock; 433884d179dSJan Kara if (ret2 < 0) { 434884d179dSJan Kara ret = ret2; 435884d179dSJan Kara goto out_iolock; 436884d179dSJan Kara } 437884d179dSJan Kara } 438044c9b67SJan Kara /* 439044c9b67SJan Kara * Make sure flags update is visible after on-disk struct has been 440044c9b67SJan Kara * allocated. Paired with smp_rmb() in dqget(). 441044c9b67SJan Kara */ 442044c9b67SJan Kara smp_mb__before_atomic(); 443884d179dSJan Kara set_bit(DQ_ACTIVE_B, &dquot->dq_flags); 444884d179dSJan Kara out_iolock: 445884d179dSJan Kara mutex_unlock(&dquot->dq_lock); 446884d179dSJan Kara return ret; 447884d179dSJan Kara } 448884d179dSJan Kara EXPORT_SYMBOL(dquot_acquire); 449884d179dSJan Kara 450884d179dSJan Kara /* 451884d179dSJan Kara * Write dquot to disk 452884d179dSJan Kara */ 453884d179dSJan Kara int dquot_commit(struct dquot *dquot) 454884d179dSJan Kara { 455b03f2456SJan Kara int ret = 0; 456884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); 457884d179dSJan Kara 4585e8cb9b6SJan Kara mutex_lock(&dquot->dq_lock); 4591e0b7cb0SJan Kara if (!clear_dquot_dirty(dquot)) 4605e8cb9b6SJan Kara goto out_lock; 461884d179dSJan Kara /* Inactive dquot can be only if there was error during read/init 462884d179dSJan Kara * => we have better not writing it */ 4638fc32c2bSJan Kara if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) 4644c376dcaSEric W. Biederman ret = dqopt->ops[dquot->dq_id.type]->commit_dqblk(dquot); 4658fc32c2bSJan Kara else 4665e8cb9b6SJan Kara ret = -EIO; 4675e8cb9b6SJan Kara out_lock: 4685e8cb9b6SJan Kara mutex_unlock(&dquot->dq_lock); 469884d179dSJan Kara return ret; 470884d179dSJan Kara } 471884d179dSJan Kara EXPORT_SYMBOL(dquot_commit); 472884d179dSJan Kara 473884d179dSJan Kara /* 474884d179dSJan Kara * Release dquot 475884d179dSJan Kara */ 476884d179dSJan Kara int dquot_release(struct dquot *dquot) 477884d179dSJan Kara { 478884d179dSJan Kara int ret = 0, ret2 = 0; 479884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); 480884d179dSJan Kara 481884d179dSJan Kara mutex_lock(&dquot->dq_lock); 482884d179dSJan Kara /* Check whether we are not racing with some other dqget() */ 483884d179dSJan Kara if (atomic_read(&dquot->dq_count) > 1) 484884d179dSJan Kara goto out_dqlock; 4854c376dcaSEric W. Biederman if (dqopt->ops[dquot->dq_id.type]->release_dqblk) { 4864c376dcaSEric W. Biederman ret = dqopt->ops[dquot->dq_id.type]->release_dqblk(dquot); 487884d179dSJan Kara /* Write the info */ 4884c376dcaSEric W. Biederman if (info_dirty(&dqopt->info[dquot->dq_id.type])) { 4894c376dcaSEric W. Biederman ret2 = dqopt->ops[dquot->dq_id.type]->write_file_info( 4904c376dcaSEric W. Biederman dquot->dq_sb, dquot->dq_id.type); 491268157baSJan Kara } 492884d179dSJan Kara if (ret >= 0) 493884d179dSJan Kara ret = ret2; 494884d179dSJan Kara } 495884d179dSJan Kara clear_bit(DQ_ACTIVE_B, &dquot->dq_flags); 496884d179dSJan Kara out_dqlock: 497884d179dSJan Kara mutex_unlock(&dquot->dq_lock); 498884d179dSJan Kara return ret; 499884d179dSJan Kara } 500884d179dSJan Kara EXPORT_SYMBOL(dquot_release); 501884d179dSJan Kara 502884d179dSJan Kara void dquot_destroy(struct dquot *dquot) 503884d179dSJan Kara { 504884d179dSJan Kara kmem_cache_free(dquot_cachep, dquot); 505884d179dSJan Kara } 506884d179dSJan Kara EXPORT_SYMBOL(dquot_destroy); 507884d179dSJan Kara 508884d179dSJan Kara static inline void do_destroy_dquot(struct dquot *dquot) 509884d179dSJan Kara { 510884d179dSJan Kara dquot->dq_sb->dq_op->destroy_dquot(dquot); 511884d179dSJan Kara } 512884d179dSJan Kara 513884d179dSJan Kara /* Invalidate all dquots on the list. Note that this function is called after 514884d179dSJan Kara * quota is disabled and pointers from inodes removed so there cannot be new 515884d179dSJan Kara * quota users. There can still be some users of quotas due to inodes being 516884d179dSJan Kara * just deleted or pruned by prune_icache() (those are not attached to any 517884d179dSJan Kara * list) or parallel quotactl call. We have to wait for such users. 518884d179dSJan Kara */ 519884d179dSJan Kara static void invalidate_dquots(struct super_block *sb, int type) 520884d179dSJan Kara { 521884d179dSJan Kara struct dquot *dquot, *tmp; 522884d179dSJan Kara 523884d179dSJan Kara restart: 524884d179dSJan Kara spin_lock(&dq_list_lock); 525884d179dSJan Kara list_for_each_entry_safe(dquot, tmp, &inuse_list, dq_inuse) { 526884d179dSJan Kara if (dquot->dq_sb != sb) 527884d179dSJan Kara continue; 5284c376dcaSEric W. Biederman if (dquot->dq_id.type != type) 529884d179dSJan Kara continue; 530884d179dSJan Kara /* Wait for dquot users */ 531884d179dSJan Kara if (atomic_read(&dquot->dq_count)) { 5329f985cb6SJan Kara dqgrab(dquot); 533884d179dSJan Kara spin_unlock(&dq_list_lock); 534*503330f3SJan Kara /* 535*503330f3SJan Kara * Once dqput() wakes us up, we know it's time to free 536884d179dSJan Kara * the dquot. 537884d179dSJan Kara * IMPORTANT: we rely on the fact that there is always 538884d179dSJan Kara * at most one process waiting for dquot to free. 539884d179dSJan Kara * Otherwise dq_count would be > 1 and we would never 540884d179dSJan Kara * wake up. 541884d179dSJan Kara */ 542*503330f3SJan Kara wait_event(dquot_ref_wq, 543*503330f3SJan Kara atomic_read(&dquot->dq_count) == 1); 544884d179dSJan Kara dqput(dquot); 545884d179dSJan Kara /* At this moment dquot() need not exist (it could be 546884d179dSJan Kara * reclaimed by prune_dqcache(). Hence we must 547884d179dSJan Kara * restart. */ 548884d179dSJan Kara goto restart; 549884d179dSJan Kara } 550884d179dSJan Kara /* 551884d179dSJan Kara * Quota now has no users and it has been written on last 552884d179dSJan Kara * dqput() 553884d179dSJan Kara */ 554884d179dSJan Kara remove_dquot_hash(dquot); 555884d179dSJan Kara remove_free_dquot(dquot); 556884d179dSJan Kara remove_inuse(dquot); 557884d179dSJan Kara do_destroy_dquot(dquot); 558884d179dSJan Kara } 559884d179dSJan Kara spin_unlock(&dq_list_lock); 560884d179dSJan Kara } 561884d179dSJan Kara 562884d179dSJan Kara /* Call callback for every active dquot on given filesystem */ 563884d179dSJan Kara int dquot_scan_active(struct super_block *sb, 564884d179dSJan Kara int (*fn)(struct dquot *dquot, unsigned long priv), 565884d179dSJan Kara unsigned long priv) 566884d179dSJan Kara { 567884d179dSJan Kara struct dquot *dquot, *old_dquot = NULL; 568884d179dSJan Kara int ret = 0; 569884d179dSJan Kara 570ee1ac541SJan Kara WARN_ON_ONCE(!rwsem_is_locked(&sb->s_umount)); 571ee1ac541SJan Kara 572884d179dSJan Kara spin_lock(&dq_list_lock); 573884d179dSJan Kara list_for_each_entry(dquot, &inuse_list, dq_inuse) { 574884d179dSJan Kara if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) 575884d179dSJan Kara continue; 576884d179dSJan Kara if (dquot->dq_sb != sb) 577884d179dSJan Kara continue; 578884d179dSJan Kara /* Now we have active dquot so we can just increase use count */ 579884d179dSJan Kara atomic_inc(&dquot->dq_count); 580884d179dSJan Kara spin_unlock(&dq_list_lock); 581dde95888SDmitry Monakhov dqstats_inc(DQST_LOOKUPS); 582884d179dSJan Kara dqput(old_dquot); 583884d179dSJan Kara old_dquot = dquot; 5841362f4eaSJan Kara /* 5851362f4eaSJan Kara * ->release_dquot() can be racing with us. Our reference 5861362f4eaSJan Kara * protects us from new calls to it so just wait for any 5871362f4eaSJan Kara * outstanding call and recheck the DQ_ACTIVE_B after that. 5881362f4eaSJan Kara */ 5891362f4eaSJan Kara wait_on_dquot(dquot); 5901362f4eaSJan Kara if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { 591884d179dSJan Kara ret = fn(dquot, priv); 592884d179dSJan Kara if (ret < 0) 593884d179dSJan Kara goto out; 5941362f4eaSJan Kara } 595884d179dSJan Kara spin_lock(&dq_list_lock); 596884d179dSJan Kara /* We are safe to continue now because our dquot could not 597884d179dSJan Kara * be moved out of the inuse list while we hold the reference */ 598884d179dSJan Kara } 599884d179dSJan Kara spin_unlock(&dq_list_lock); 600884d179dSJan Kara out: 601884d179dSJan Kara dqput(old_dquot); 602884d179dSJan Kara return ret; 603884d179dSJan Kara } 604884d179dSJan Kara EXPORT_SYMBOL(dquot_scan_active); 605884d179dSJan Kara 606ceed1723SJan Kara /* Write all dquot structures to quota files */ 607ceed1723SJan Kara int dquot_writeback_dquots(struct super_block *sb, int type) 608884d179dSJan Kara { 609884d179dSJan Kara struct list_head *dirty; 610884d179dSJan Kara struct dquot *dquot; 611884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 612884d179dSJan Kara int cnt; 613ceed1723SJan Kara int err, ret = 0; 614884d179dSJan Kara 6159d1ccbe7SJan Kara WARN_ON_ONCE(!rwsem_is_locked(&sb->s_umount)); 6169d1ccbe7SJan Kara 617884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 618884d179dSJan Kara if (type != -1 && cnt != type) 619884d179dSJan Kara continue; 620884d179dSJan Kara if (!sb_has_quota_active(sb, cnt)) 621884d179dSJan Kara continue; 622884d179dSJan Kara spin_lock(&dq_list_lock); 623884d179dSJan Kara dirty = &dqopt->info[cnt].dqi_dirty_list; 624884d179dSJan Kara while (!list_empty(dirty)) { 625268157baSJan Kara dquot = list_first_entry(dirty, struct dquot, 626268157baSJan Kara dq_dirty); 6274580b30eSJan Kara 6284580b30eSJan Kara WARN_ON(!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)); 6294580b30eSJan Kara 630884d179dSJan Kara /* Now we have active dquot from which someone is 631884d179dSJan Kara * holding reference so we can safely just increase 632884d179dSJan Kara * use count */ 6339f985cb6SJan Kara dqgrab(dquot); 634884d179dSJan Kara spin_unlock(&dq_list_lock); 635dde95888SDmitry Monakhov dqstats_inc(DQST_LOOKUPS); 636ceed1723SJan Kara err = sb->dq_op->write_dquot(dquot); 637ceed1723SJan Kara if (!ret && err) 638474d2605SJan Kara ret = err; 639884d179dSJan Kara dqput(dquot); 640884d179dSJan Kara spin_lock(&dq_list_lock); 641884d179dSJan Kara } 642884d179dSJan Kara spin_unlock(&dq_list_lock); 643884d179dSJan Kara } 644884d179dSJan Kara 645884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 646884d179dSJan Kara if ((cnt == type || type == -1) && sb_has_quota_active(sb, cnt) 647884d179dSJan Kara && info_dirty(&dqopt->info[cnt])) 648884d179dSJan Kara sb->dq_op->write_info(sb, cnt); 649dde95888SDmitry Monakhov dqstats_inc(DQST_SYNCS); 650884d179dSJan Kara 651ceed1723SJan Kara return ret; 652ceed1723SJan Kara } 653ceed1723SJan Kara EXPORT_SYMBOL(dquot_writeback_dquots); 654ceed1723SJan Kara 655ceed1723SJan Kara /* Write all dquot structures to disk and make them visible from userspace */ 656ceed1723SJan Kara int dquot_quota_sync(struct super_block *sb, int type) 657ceed1723SJan Kara { 658ceed1723SJan Kara struct quota_info *dqopt = sb_dqopt(sb); 659ceed1723SJan Kara int cnt; 660ceed1723SJan Kara int ret; 661ceed1723SJan Kara 662ceed1723SJan Kara ret = dquot_writeback_dquots(sb, type); 663ceed1723SJan Kara if (ret) 664ceed1723SJan Kara return ret; 665ceed1723SJan Kara if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) 6665fb324adSChristoph Hellwig return 0; 6675fb324adSChristoph Hellwig 6685fb324adSChristoph Hellwig /* This is not very clever (and fast) but currently I don't know about 6695fb324adSChristoph Hellwig * any other simple way of getting quota data to disk and we must get 6705fb324adSChristoph Hellwig * them there for userspace to be visible... */ 6715fb324adSChristoph Hellwig if (sb->s_op->sync_fs) 6725fb324adSChristoph Hellwig sb->s_op->sync_fs(sb, 1); 6735fb324adSChristoph Hellwig sync_blockdev(sb->s_bdev); 6745fb324adSChristoph Hellwig 6755fb324adSChristoph Hellwig /* 6765fb324adSChristoph Hellwig * Now when everything is written we can discard the pagecache so 6775fb324adSChristoph Hellwig * that userspace sees the changes. 6785fb324adSChristoph Hellwig */ 6795fb324adSChristoph Hellwig for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 6805fb324adSChristoph Hellwig if (type != -1 && cnt != type) 6815fb324adSChristoph Hellwig continue; 6825fb324adSChristoph Hellwig if (!sb_has_quota_active(sb, cnt)) 6835fb324adSChristoph Hellwig continue; 6845955102cSAl Viro inode_lock(dqopt->files[cnt]); 685f9ef1784SJan Kara truncate_inode_pages(&dqopt->files[cnt]->i_data, 0); 6865955102cSAl Viro inode_unlock(dqopt->files[cnt]); 6875fb324adSChristoph Hellwig } 6885fb324adSChristoph Hellwig 689884d179dSJan Kara return 0; 690884d179dSJan Kara } 691287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_quota_sync); 692884d179dSJan Kara 6931ab6c499SDave Chinner static unsigned long 6941ab6c499SDave Chinner dqcache_shrink_scan(struct shrinker *shrink, struct shrink_control *sc) 695884d179dSJan Kara { 696884d179dSJan Kara struct list_head *head; 697884d179dSJan Kara struct dquot *dquot; 6981ab6c499SDave Chinner unsigned long freed = 0; 699884d179dSJan Kara 700d68aab6bSNiu Yawei spin_lock(&dq_list_lock); 701884d179dSJan Kara head = free_dquots.prev; 7021ab6c499SDave Chinner while (head != &free_dquots && sc->nr_to_scan) { 703884d179dSJan Kara dquot = list_entry(head, struct dquot, dq_free); 704884d179dSJan Kara remove_dquot_hash(dquot); 705884d179dSJan Kara remove_free_dquot(dquot); 706884d179dSJan Kara remove_inuse(dquot); 707884d179dSJan Kara do_destroy_dquot(dquot); 7081ab6c499SDave Chinner sc->nr_to_scan--; 7091ab6c499SDave Chinner freed++; 710884d179dSJan Kara head = free_dquots.prev; 711884d179dSJan Kara } 712d68aab6bSNiu Yawei spin_unlock(&dq_list_lock); 7131ab6c499SDave Chinner return freed; 714884d179dSJan Kara } 715884d179dSJan Kara 7161ab6c499SDave Chinner static unsigned long 7171ab6c499SDave Chinner dqcache_shrink_count(struct shrinker *shrink, struct shrink_control *sc) 718884d179dSJan Kara { 71955f841ceSGlauber Costa return vfs_pressure_ratio( 72055f841ceSGlauber Costa percpu_counter_read_positive(&dqstats.counter[DQST_FREE_DQUOTS])); 721884d179dSJan Kara } 722884d179dSJan Kara 723884d179dSJan Kara static struct shrinker dqcache_shrinker = { 7241ab6c499SDave Chinner .count_objects = dqcache_shrink_count, 7251ab6c499SDave Chinner .scan_objects = dqcache_shrink_scan, 726884d179dSJan Kara .seeks = DEFAULT_SEEKS, 727884d179dSJan Kara }; 728884d179dSJan Kara 729884d179dSJan Kara /* 730884d179dSJan Kara * Put reference to dquot 731884d179dSJan Kara */ 732884d179dSJan Kara void dqput(struct dquot *dquot) 733884d179dSJan Kara { 734884d179dSJan Kara int ret; 735884d179dSJan Kara 736884d179dSJan Kara if (!dquot) 737884d179dSJan Kara return; 73862af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 739884d179dSJan Kara if (!atomic_read(&dquot->dq_count)) { 740fb5ffb0eSJiaying Zhang quota_error(dquot->dq_sb, "trying to free free dquot of %s %d", 7414c376dcaSEric W. Biederman quotatypes[dquot->dq_id.type], 7424c376dcaSEric W. Biederman from_kqid(&init_user_ns, dquot->dq_id)); 743884d179dSJan Kara BUG(); 744884d179dSJan Kara } 745884d179dSJan Kara #endif 746dde95888SDmitry Monakhov dqstats_inc(DQST_DROPS); 747884d179dSJan Kara we_slept: 748884d179dSJan Kara spin_lock(&dq_list_lock); 749884d179dSJan Kara if (atomic_read(&dquot->dq_count) > 1) { 750884d179dSJan Kara /* We have more than one user... nothing to do */ 751884d179dSJan Kara atomic_dec(&dquot->dq_count); 752884d179dSJan Kara /* Releasing dquot during quotaoff phase? */ 7534c376dcaSEric W. Biederman if (!sb_has_quota_active(dquot->dq_sb, dquot->dq_id.type) && 754884d179dSJan Kara atomic_read(&dquot->dq_count) == 1) 755*503330f3SJan Kara wake_up(&dquot_ref_wq); 756884d179dSJan Kara spin_unlock(&dq_list_lock); 757884d179dSJan Kara return; 758884d179dSJan Kara } 759884d179dSJan Kara /* Need to release dquot? */ 7604580b30eSJan Kara if (dquot_dirty(dquot)) { 761884d179dSJan Kara spin_unlock(&dq_list_lock); 762884d179dSJan Kara /* Commit dquot before releasing */ 763884d179dSJan Kara ret = dquot->dq_sb->dq_op->write_dquot(dquot); 764884d179dSJan Kara if (ret < 0) { 765fb5ffb0eSJiaying Zhang quota_error(dquot->dq_sb, "Can't write quota structure" 766fb5ffb0eSJiaying Zhang " (error %d). Quota may get out of sync!", 767fb5ffb0eSJiaying Zhang ret); 768884d179dSJan Kara /* 769884d179dSJan Kara * We clear dirty bit anyway, so that we avoid 770884d179dSJan Kara * infinite loop here 771884d179dSJan Kara */ 772884d179dSJan Kara clear_dquot_dirty(dquot); 773884d179dSJan Kara } 774884d179dSJan Kara goto we_slept; 775884d179dSJan Kara } 776884d179dSJan Kara if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { 777884d179dSJan Kara spin_unlock(&dq_list_lock); 778884d179dSJan Kara dquot->dq_sb->dq_op->release_dquot(dquot); 779884d179dSJan Kara goto we_slept; 780884d179dSJan Kara } 781884d179dSJan Kara atomic_dec(&dquot->dq_count); 78262af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 783884d179dSJan Kara /* sanity check */ 784884d179dSJan Kara BUG_ON(!list_empty(&dquot->dq_free)); 785884d179dSJan Kara #endif 786884d179dSJan Kara put_dquot_last(dquot); 787884d179dSJan Kara spin_unlock(&dq_list_lock); 788884d179dSJan Kara } 789884d179dSJan Kara EXPORT_SYMBOL(dqput); 790884d179dSJan Kara 791884d179dSJan Kara struct dquot *dquot_alloc(struct super_block *sb, int type) 792884d179dSJan Kara { 793884d179dSJan Kara return kmem_cache_zalloc(dquot_cachep, GFP_NOFS); 794884d179dSJan Kara } 795884d179dSJan Kara EXPORT_SYMBOL(dquot_alloc); 796884d179dSJan Kara 797884d179dSJan Kara static struct dquot *get_empty_dquot(struct super_block *sb, int type) 798884d179dSJan Kara { 799884d179dSJan Kara struct dquot *dquot; 800884d179dSJan Kara 801884d179dSJan Kara dquot = sb->dq_op->alloc_dquot(sb, type); 802884d179dSJan Kara if(!dquot) 803dd6f3c6dSJan Kara return NULL; 804884d179dSJan Kara 805884d179dSJan Kara mutex_init(&dquot->dq_lock); 806884d179dSJan Kara INIT_LIST_HEAD(&dquot->dq_free); 807884d179dSJan Kara INIT_LIST_HEAD(&dquot->dq_inuse); 808884d179dSJan Kara INIT_HLIST_NODE(&dquot->dq_hash); 809884d179dSJan Kara INIT_LIST_HEAD(&dquot->dq_dirty); 810884d179dSJan Kara dquot->dq_sb = sb; 8111a06d420SEric W. Biederman dquot->dq_id = make_kqid_invalid(type); 812884d179dSJan Kara atomic_set(&dquot->dq_count, 1); 813884d179dSJan Kara 814884d179dSJan Kara return dquot; 815884d179dSJan Kara } 816884d179dSJan Kara 817884d179dSJan Kara /* 818884d179dSJan Kara * Get reference to dquot 819884d179dSJan Kara * 820884d179dSJan Kara * Locking is slightly tricky here. We are guarded from parallel quotaoff() 821884d179dSJan Kara * destroying our dquot by: 822884d179dSJan Kara * a) checking for quota flags under dq_list_lock and 823884d179dSJan Kara * b) getting a reference to dquot before we release dq_list_lock 824884d179dSJan Kara */ 825aca645a6SEric W. Biederman struct dquot *dqget(struct super_block *sb, struct kqid qid) 826884d179dSJan Kara { 8271a06d420SEric W. Biederman unsigned int hashent = hashfn(sb, qid); 8286184fc0bSJan Kara struct dquot *dquot, *empty = NULL; 829884d179dSJan Kara 830d49d3762SEric W. Biederman if (!qid_has_mapping(sb->s_user_ns, qid)) 831d49d3762SEric W. Biederman return ERR_PTR(-EINVAL); 832d49d3762SEric W. Biederman 8331a06d420SEric W. Biederman if (!sb_has_quota_active(sb, qid.type)) 8346184fc0bSJan Kara return ERR_PTR(-ESRCH); 835884d179dSJan Kara we_slept: 836884d179dSJan Kara spin_lock(&dq_list_lock); 837884d179dSJan Kara spin_lock(&dq_state_lock); 8381a06d420SEric W. Biederman if (!sb_has_quota_active(sb, qid.type)) { 839884d179dSJan Kara spin_unlock(&dq_state_lock); 840884d179dSJan Kara spin_unlock(&dq_list_lock); 8416184fc0bSJan Kara dquot = ERR_PTR(-ESRCH); 842884d179dSJan Kara goto out; 843884d179dSJan Kara } 844884d179dSJan Kara spin_unlock(&dq_state_lock); 845884d179dSJan Kara 8461a06d420SEric W. Biederman dquot = find_dquot(hashent, sb, qid); 847dd6f3c6dSJan Kara if (!dquot) { 848dd6f3c6dSJan Kara if (!empty) { 849884d179dSJan Kara spin_unlock(&dq_list_lock); 8501a06d420SEric W. Biederman empty = get_empty_dquot(sb, qid.type); 851dd6f3c6dSJan Kara if (!empty) 852884d179dSJan Kara schedule(); /* Try to wait for a moment... */ 853884d179dSJan Kara goto we_slept; 854884d179dSJan Kara } 855884d179dSJan Kara dquot = empty; 856dd6f3c6dSJan Kara empty = NULL; 8574c376dcaSEric W. Biederman dquot->dq_id = qid; 858884d179dSJan Kara /* all dquots go on the inuse_list */ 859884d179dSJan Kara put_inuse(dquot); 860884d179dSJan Kara /* hash it first so it can be found */ 861884d179dSJan Kara insert_dquot_hash(dquot); 862884d179dSJan Kara spin_unlock(&dq_list_lock); 863dde95888SDmitry Monakhov dqstats_inc(DQST_LOOKUPS); 864884d179dSJan Kara } else { 865884d179dSJan Kara if (!atomic_read(&dquot->dq_count)) 866884d179dSJan Kara remove_free_dquot(dquot); 867884d179dSJan Kara atomic_inc(&dquot->dq_count); 868884d179dSJan Kara spin_unlock(&dq_list_lock); 869dde95888SDmitry Monakhov dqstats_inc(DQST_CACHE_HITS); 870dde95888SDmitry Monakhov dqstats_inc(DQST_LOOKUPS); 871884d179dSJan Kara } 872268157baSJan Kara /* Wait for dq_lock - after this we know that either dquot_release() is 873268157baSJan Kara * already finished or it will be canceled due to dq_count > 1 test */ 874884d179dSJan Kara wait_on_dquot(dquot); 875268157baSJan Kara /* Read the dquot / allocate space in quota file */ 8766184fc0bSJan Kara if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { 8776184fc0bSJan Kara int err; 8786184fc0bSJan Kara 8796184fc0bSJan Kara err = sb->dq_op->acquire_dquot(dquot); 8806184fc0bSJan Kara if (err < 0) { 881884d179dSJan Kara dqput(dquot); 8826184fc0bSJan Kara dquot = ERR_PTR(err); 883884d179dSJan Kara goto out; 884884d179dSJan Kara } 8856184fc0bSJan Kara } 886044c9b67SJan Kara /* 887044c9b67SJan Kara * Make sure following reads see filled structure - paired with 888044c9b67SJan Kara * smp_mb__before_atomic() in dquot_acquire(). 889044c9b67SJan Kara */ 890044c9b67SJan Kara smp_rmb(); 89162af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 892884d179dSJan Kara BUG_ON(!dquot->dq_sb); /* Has somebody invalidated entry under us? */ 893884d179dSJan Kara #endif 894884d179dSJan Kara out: 895884d179dSJan Kara if (empty) 896884d179dSJan Kara do_destroy_dquot(empty); 897884d179dSJan Kara 898884d179dSJan Kara return dquot; 899884d179dSJan Kara } 900884d179dSJan Kara EXPORT_SYMBOL(dqget); 901884d179dSJan Kara 9022d0fa467SJan Kara static inline struct dquot **i_dquot(struct inode *inode) 9032d0fa467SJan Kara { 9042d0fa467SJan Kara return inode->i_sb->s_op->get_dquots(inode); 9052d0fa467SJan Kara } 9062d0fa467SJan Kara 907884d179dSJan Kara static int dqinit_needed(struct inode *inode, int type) 908884d179dSJan Kara { 9095bcd3b6fSKonstantin Khlebnikov struct dquot * const *dquots; 910884d179dSJan Kara int cnt; 911884d179dSJan Kara 912884d179dSJan Kara if (IS_NOQUOTA(inode)) 913884d179dSJan Kara return 0; 9145bcd3b6fSKonstantin Khlebnikov 9155bcd3b6fSKonstantin Khlebnikov dquots = i_dquot(inode); 916884d179dSJan Kara if (type != -1) 9175bcd3b6fSKonstantin Khlebnikov return !dquots[type]; 918884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 9195bcd3b6fSKonstantin Khlebnikov if (!dquots[cnt]) 920884d179dSJan Kara return 1; 921884d179dSJan Kara return 0; 922884d179dSJan Kara } 923884d179dSJan Kara 924c3b00446SJan Kara /* This routine is guarded by s_umount semaphore */ 925884d179dSJan Kara static void add_dquot_ref(struct super_block *sb, int type) 926884d179dSJan Kara { 927884d179dSJan Kara struct inode *inode, *old_inode = NULL; 92862af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 9290a5a9c72SJan Kara int reserved = 0; 9304c5e6c0eSJan Kara #endif 931884d179dSJan Kara 93274278da9SDave Chinner spin_lock(&sb->s_inode_list_lock); 933884d179dSJan Kara list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { 934250df6edSDave Chinner spin_lock(&inode->i_lock); 935250df6edSDave Chinner if ((inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW)) || 936250df6edSDave Chinner !atomic_read(&inode->i_writecount) || 937250df6edSDave Chinner !dqinit_needed(inode, type)) { 938250df6edSDave Chinner spin_unlock(&inode->i_lock); 9393ae5080fSLinus Torvalds continue; 940250df6edSDave Chinner } 941884d179dSJan Kara __iget(inode); 942250df6edSDave Chinner spin_unlock(&inode->i_lock); 94374278da9SDave Chinner spin_unlock(&sb->s_inode_list_lock); 944884d179dSJan Kara 945d7e97117SJan Kara #ifdef CONFIG_QUOTA_DEBUG 946d7e97117SJan Kara if (unlikely(inode_get_rsv_space(inode) > 0)) 947d7e97117SJan Kara reserved = 1; 948d7e97117SJan Kara #endif 949884d179dSJan Kara iput(old_inode); 950871a2931SChristoph Hellwig __dquot_initialize(inode, type); 95155fa6091SDave Chinner 95255fa6091SDave Chinner /* 95355fa6091SDave Chinner * We hold a reference to 'inode' so it couldn't have been 95455fa6091SDave Chinner * removed from s_inodes list while we dropped the 95574278da9SDave Chinner * s_inode_list_lock. We cannot iput the inode now as we can be 95655fa6091SDave Chinner * holding the last reference and we cannot iput it under 95774278da9SDave Chinner * s_inode_list_lock. So we keep the reference and iput it 95855fa6091SDave Chinner * later. 95955fa6091SDave Chinner */ 960884d179dSJan Kara old_inode = inode; 96174278da9SDave Chinner spin_lock(&sb->s_inode_list_lock); 962884d179dSJan Kara } 96374278da9SDave Chinner spin_unlock(&sb->s_inode_list_lock); 964884d179dSJan Kara iput(old_inode); 9650a5a9c72SJan Kara 96662af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 9670a5a9c72SJan Kara if (reserved) { 968fb5ffb0eSJiaying Zhang quota_error(sb, "Writes happened before quota was turned on " 969fb5ffb0eSJiaying Zhang "thus quota information is probably inconsistent. " 970fb5ffb0eSJiaying Zhang "Please run quotacheck(8)"); 9710a5a9c72SJan Kara } 9724c5e6c0eSJan Kara #endif 973884d179dSJan Kara } 974884d179dSJan Kara 975268157baSJan Kara /* 976268157baSJan Kara * Remove references to dquots from inode and add dquot to list for freeing 97725985edcSLucas De Marchi * if we have the last reference to dquot 978268157baSJan Kara */ 9799eb6463fSNiu Yawei static void remove_inode_dquot_ref(struct inode *inode, int type, 980884d179dSJan Kara struct list_head *tofree_head) 981884d179dSJan Kara { 9825bcd3b6fSKonstantin Khlebnikov struct dquot **dquots = i_dquot(inode); 9835bcd3b6fSKonstantin Khlebnikov struct dquot *dquot = dquots[type]; 984884d179dSJan Kara 9859eb6463fSNiu Yawei if (!dquot) 9869eb6463fSNiu Yawei return; 9879eb6463fSNiu Yawei 9885bcd3b6fSKonstantin Khlebnikov dquots[type] = NULL; 9899eb6463fSNiu Yawei if (list_empty(&dquot->dq_free)) { 9909eb6463fSNiu Yawei /* 9919eb6463fSNiu Yawei * The inode still has reference to dquot so it can't be in the 9929eb6463fSNiu Yawei * free list 9939eb6463fSNiu Yawei */ 994884d179dSJan Kara spin_lock(&dq_list_lock); 995268157baSJan Kara list_add(&dquot->dq_free, tofree_head); 996884d179dSJan Kara spin_unlock(&dq_list_lock); 9979eb6463fSNiu Yawei } else { 9989eb6463fSNiu Yawei /* 9999eb6463fSNiu Yawei * Dquot is already in a list to put so we won't drop the last 10009eb6463fSNiu Yawei * reference here. 10019eb6463fSNiu Yawei */ 10029eb6463fSNiu Yawei dqput(dquot); 1003884d179dSJan Kara } 1004884d179dSJan Kara } 1005884d179dSJan Kara 1006268157baSJan Kara /* 1007268157baSJan Kara * Free list of dquots 1008268157baSJan Kara * Dquots are removed from inodes and no new references can be got so we are 1009268157baSJan Kara * the only ones holding reference 1010268157baSJan Kara */ 1011884d179dSJan Kara static void put_dquot_list(struct list_head *tofree_head) 1012884d179dSJan Kara { 1013884d179dSJan Kara struct list_head *act_head; 1014884d179dSJan Kara struct dquot *dquot; 1015884d179dSJan Kara 1016884d179dSJan Kara act_head = tofree_head->next; 1017884d179dSJan Kara while (act_head != tofree_head) { 1018884d179dSJan Kara dquot = list_entry(act_head, struct dquot, dq_free); 1019884d179dSJan Kara act_head = act_head->next; 1020268157baSJan Kara /* Remove dquot from the list so we won't have problems... */ 1021268157baSJan Kara list_del_init(&dquot->dq_free); 1022884d179dSJan Kara dqput(dquot); 1023884d179dSJan Kara } 1024884d179dSJan Kara } 1025884d179dSJan Kara 1026884d179dSJan Kara static void remove_dquot_ref(struct super_block *sb, int type, 1027884d179dSJan Kara struct list_head *tofree_head) 1028884d179dSJan Kara { 1029884d179dSJan Kara struct inode *inode; 10307af9cce8SDmitry Monakhov int reserved = 0; 1031884d179dSJan Kara 103274278da9SDave Chinner spin_lock(&sb->s_inode_list_lock); 1033884d179dSJan Kara list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { 10343ae5080fSLinus Torvalds /* 10353ae5080fSLinus Torvalds * We have to scan also I_NEW inodes because they can already 10363ae5080fSLinus Torvalds * have quota pointer initialized. Luckily, we need to touch 10373ae5080fSLinus Torvalds * only quota pointers and these have separate locking 1038b9ba6f94SNiu Yawei * (dq_data_lock). 10393ae5080fSLinus Torvalds */ 1040b9ba6f94SNiu Yawei spin_lock(&dq_data_lock); 10417af9cce8SDmitry Monakhov if (!IS_NOQUOTA(inode)) { 10427af9cce8SDmitry Monakhov if (unlikely(inode_get_rsv_space(inode) > 0)) 10437af9cce8SDmitry Monakhov reserved = 1; 1044884d179dSJan Kara remove_inode_dquot_ref(inode, type, tofree_head); 1045884d179dSJan Kara } 1046b9ba6f94SNiu Yawei spin_unlock(&dq_data_lock); 10477af9cce8SDmitry Monakhov } 104874278da9SDave Chinner spin_unlock(&sb->s_inode_list_lock); 10497af9cce8SDmitry Monakhov #ifdef CONFIG_QUOTA_DEBUG 10507af9cce8SDmitry Monakhov if (reserved) { 10517af9cce8SDmitry Monakhov printk(KERN_WARNING "VFS (%s): Writes happened after quota" 10527af9cce8SDmitry Monakhov " was disabled thus quota information is probably " 10537af9cce8SDmitry Monakhov "inconsistent. Please run quotacheck(8).\n", sb->s_id); 10547af9cce8SDmitry Monakhov } 10557af9cce8SDmitry Monakhov #endif 1056884d179dSJan Kara } 1057884d179dSJan Kara 1058884d179dSJan Kara /* Gather all references from inodes and drop them */ 1059884d179dSJan Kara static void drop_dquot_ref(struct super_block *sb, int type) 1060884d179dSJan Kara { 1061884d179dSJan Kara LIST_HEAD(tofree_head); 1062884d179dSJan Kara 1063884d179dSJan Kara if (sb->dq_op) { 1064884d179dSJan Kara remove_dquot_ref(sb, type, &tofree_head); 1065b9ba6f94SNiu Yawei synchronize_srcu(&dquot_srcu); 1066884d179dSJan Kara put_dquot_list(&tofree_head); 1067884d179dSJan Kara } 1068884d179dSJan Kara } 1069884d179dSJan Kara 1070884d179dSJan Kara static inline void dquot_incr_inodes(struct dquot *dquot, qsize_t number) 1071884d179dSJan Kara { 1072884d179dSJan Kara dquot->dq_dqb.dqb_curinodes += number; 1073884d179dSJan Kara } 1074884d179dSJan Kara 1075884d179dSJan Kara static inline void dquot_incr_space(struct dquot *dquot, qsize_t number) 1076884d179dSJan Kara { 1077884d179dSJan Kara dquot->dq_dqb.dqb_curspace += number; 1078884d179dSJan Kara } 1079884d179dSJan Kara 1080884d179dSJan Kara static inline void dquot_resv_space(struct dquot *dquot, qsize_t number) 1081884d179dSJan Kara { 1082884d179dSJan Kara dquot->dq_dqb.dqb_rsvspace += number; 1083884d179dSJan Kara } 1084884d179dSJan Kara 1085884d179dSJan Kara /* 1086884d179dSJan Kara * Claim reserved quota space 1087884d179dSJan Kara */ 10880a5a9c72SJan Kara static void dquot_claim_reserved_space(struct dquot *dquot, qsize_t number) 1089884d179dSJan Kara { 10900a5a9c72SJan Kara if (dquot->dq_dqb.dqb_rsvspace < number) { 10910a5a9c72SJan Kara WARN_ON_ONCE(1); 10920a5a9c72SJan Kara number = dquot->dq_dqb.dqb_rsvspace; 10930a5a9c72SJan Kara } 1094884d179dSJan Kara dquot->dq_dqb.dqb_curspace += number; 1095884d179dSJan Kara dquot->dq_dqb.dqb_rsvspace -= number; 1096884d179dSJan Kara } 1097884d179dSJan Kara 10981c8924ebSJan Kara static void dquot_reclaim_reserved_space(struct dquot *dquot, qsize_t number) 10991c8924ebSJan Kara { 11001c8924ebSJan Kara if (WARN_ON_ONCE(dquot->dq_dqb.dqb_curspace < number)) 11011c8924ebSJan Kara number = dquot->dq_dqb.dqb_curspace; 11021c8924ebSJan Kara dquot->dq_dqb.dqb_rsvspace += number; 11031c8924ebSJan Kara dquot->dq_dqb.dqb_curspace -= number; 11041c8924ebSJan Kara } 11051c8924ebSJan Kara 1106884d179dSJan Kara static inline 1107884d179dSJan Kara void dquot_free_reserved_space(struct dquot *dquot, qsize_t number) 1108884d179dSJan Kara { 11090a5a9c72SJan Kara if (dquot->dq_dqb.dqb_rsvspace >= number) 1110884d179dSJan Kara dquot->dq_dqb.dqb_rsvspace -= number; 11110a5a9c72SJan Kara else { 11120a5a9c72SJan Kara WARN_ON_ONCE(1); 11130a5a9c72SJan Kara dquot->dq_dqb.dqb_rsvspace = 0; 11140a5a9c72SJan Kara } 1115884d179dSJan Kara } 1116884d179dSJan Kara 11177a2435d8SJan Kara static void dquot_decr_inodes(struct dquot *dquot, qsize_t number) 1118884d179dSJan Kara { 1119884d179dSJan Kara if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE || 1120884d179dSJan Kara dquot->dq_dqb.dqb_curinodes >= number) 1121884d179dSJan Kara dquot->dq_dqb.dqb_curinodes -= number; 1122884d179dSJan Kara else 1123884d179dSJan Kara dquot->dq_dqb.dqb_curinodes = 0; 1124884d179dSJan Kara if (dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit) 1125e008bb61SArnd Bergmann dquot->dq_dqb.dqb_itime = (time64_t) 0; 1126884d179dSJan Kara clear_bit(DQ_INODES_B, &dquot->dq_flags); 1127884d179dSJan Kara } 1128884d179dSJan Kara 11297a2435d8SJan Kara static void dquot_decr_space(struct dquot *dquot, qsize_t number) 1130884d179dSJan Kara { 1131884d179dSJan Kara if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE || 1132884d179dSJan Kara dquot->dq_dqb.dqb_curspace >= number) 1133884d179dSJan Kara dquot->dq_dqb.dqb_curspace -= number; 1134884d179dSJan Kara else 1135884d179dSJan Kara dquot->dq_dqb.dqb_curspace = 0; 1136884d179dSJan Kara if (dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit) 1137e008bb61SArnd Bergmann dquot->dq_dqb.dqb_btime = (time64_t) 0; 1138884d179dSJan Kara clear_bit(DQ_BLKS_B, &dquot->dq_flags); 1139884d179dSJan Kara } 1140884d179dSJan Kara 1141bf097aafSJan Kara struct dquot_warn { 1142bf097aafSJan Kara struct super_block *w_sb; 11437b9c7321SEric W. Biederman struct kqid w_dq_id; 1144bf097aafSJan Kara short w_type; 1145bf097aafSJan Kara }; 1146bf097aafSJan Kara 1147884d179dSJan Kara static int warning_issued(struct dquot *dquot, const int warntype) 1148884d179dSJan Kara { 1149884d179dSJan Kara int flag = (warntype == QUOTA_NL_BHARDWARN || 1150884d179dSJan Kara warntype == QUOTA_NL_BSOFTLONGWARN) ? DQ_BLKS_B : 1151884d179dSJan Kara ((warntype == QUOTA_NL_IHARDWARN || 1152884d179dSJan Kara warntype == QUOTA_NL_ISOFTLONGWARN) ? DQ_INODES_B : 0); 1153884d179dSJan Kara 1154884d179dSJan Kara if (!flag) 1155884d179dSJan Kara return 0; 1156884d179dSJan Kara return test_and_set_bit(flag, &dquot->dq_flags); 1157884d179dSJan Kara } 1158884d179dSJan Kara 1159884d179dSJan Kara #ifdef CONFIG_PRINT_QUOTA_WARNING 1160884d179dSJan Kara static int flag_print_warnings = 1; 1161884d179dSJan Kara 1162bf097aafSJan Kara static int need_print_warning(struct dquot_warn *warn) 1163884d179dSJan Kara { 1164884d179dSJan Kara if (!flag_print_warnings) 1165884d179dSJan Kara return 0; 1166884d179dSJan Kara 11677b9c7321SEric W. Biederman switch (warn->w_dq_id.type) { 1168884d179dSJan Kara case USRQUOTA: 11691a06d420SEric W. Biederman return uid_eq(current_fsuid(), warn->w_dq_id.uid); 1170884d179dSJan Kara case GRPQUOTA: 11717b9c7321SEric W. Biederman return in_group_p(warn->w_dq_id.gid); 1172847aac64SLi Xi case PRJQUOTA: 1173847aac64SLi Xi return 1; 1174884d179dSJan Kara } 1175884d179dSJan Kara return 0; 1176884d179dSJan Kara } 1177884d179dSJan Kara 1178884d179dSJan Kara /* Print warning to user which exceeded quota */ 1179bf097aafSJan Kara static void print_warning(struct dquot_warn *warn) 1180884d179dSJan Kara { 1181884d179dSJan Kara char *msg = NULL; 1182884d179dSJan Kara struct tty_struct *tty; 1183bf097aafSJan Kara int warntype = warn->w_type; 1184884d179dSJan Kara 1185884d179dSJan Kara if (warntype == QUOTA_NL_IHARDBELOW || 1186884d179dSJan Kara warntype == QUOTA_NL_ISOFTBELOW || 1187884d179dSJan Kara warntype == QUOTA_NL_BHARDBELOW || 1188bf097aafSJan Kara warntype == QUOTA_NL_BSOFTBELOW || !need_print_warning(warn)) 1189884d179dSJan Kara return; 1190884d179dSJan Kara 1191884d179dSJan Kara tty = get_current_tty(); 1192884d179dSJan Kara if (!tty) 1193884d179dSJan Kara return; 1194bf097aafSJan Kara tty_write_message(tty, warn->w_sb->s_id); 1195884d179dSJan Kara if (warntype == QUOTA_NL_ISOFTWARN || warntype == QUOTA_NL_BSOFTWARN) 1196884d179dSJan Kara tty_write_message(tty, ": warning, "); 1197884d179dSJan Kara else 1198884d179dSJan Kara tty_write_message(tty, ": write failed, "); 11997b9c7321SEric W. Biederman tty_write_message(tty, quotatypes[warn->w_dq_id.type]); 1200884d179dSJan Kara switch (warntype) { 1201884d179dSJan Kara case QUOTA_NL_IHARDWARN: 1202884d179dSJan Kara msg = " file limit reached.\r\n"; 1203884d179dSJan Kara break; 1204884d179dSJan Kara case QUOTA_NL_ISOFTLONGWARN: 1205884d179dSJan Kara msg = " file quota exceeded too long.\r\n"; 1206884d179dSJan Kara break; 1207884d179dSJan Kara case QUOTA_NL_ISOFTWARN: 1208884d179dSJan Kara msg = " file quota exceeded.\r\n"; 1209884d179dSJan Kara break; 1210884d179dSJan Kara case QUOTA_NL_BHARDWARN: 1211884d179dSJan Kara msg = " block limit reached.\r\n"; 1212884d179dSJan Kara break; 1213884d179dSJan Kara case QUOTA_NL_BSOFTLONGWARN: 1214884d179dSJan Kara msg = " block quota exceeded too long.\r\n"; 1215884d179dSJan Kara break; 1216884d179dSJan Kara case QUOTA_NL_BSOFTWARN: 1217884d179dSJan Kara msg = " block quota exceeded.\r\n"; 1218884d179dSJan Kara break; 1219884d179dSJan Kara } 1220884d179dSJan Kara tty_write_message(tty, msg); 1221884d179dSJan Kara tty_kref_put(tty); 1222884d179dSJan Kara } 1223884d179dSJan Kara #endif 1224884d179dSJan Kara 1225bf097aafSJan Kara static void prepare_warning(struct dquot_warn *warn, struct dquot *dquot, 1226bf097aafSJan Kara int warntype) 1227bf097aafSJan Kara { 1228bf097aafSJan Kara if (warning_issued(dquot, warntype)) 1229bf097aafSJan Kara return; 1230bf097aafSJan Kara warn->w_type = warntype; 1231bf097aafSJan Kara warn->w_sb = dquot->dq_sb; 1232bf097aafSJan Kara warn->w_dq_id = dquot->dq_id; 1233bf097aafSJan Kara } 1234bf097aafSJan Kara 1235884d179dSJan Kara /* 1236884d179dSJan Kara * Write warnings to the console and send warning messages over netlink. 1237884d179dSJan Kara * 1238bf097aafSJan Kara * Note that this function can call into tty and networking code. 1239884d179dSJan Kara */ 1240bf097aafSJan Kara static void flush_warnings(struct dquot_warn *warn) 1241884d179dSJan Kara { 1242884d179dSJan Kara int i; 1243884d179dSJan Kara 124486e931a3SSteven Whitehouse for (i = 0; i < MAXQUOTAS; i++) { 1245bf097aafSJan Kara if (warn[i].w_type == QUOTA_NL_NOWARN) 1246bf097aafSJan Kara continue; 1247884d179dSJan Kara #ifdef CONFIG_PRINT_QUOTA_WARNING 1248bf097aafSJan Kara print_warning(&warn[i]); 1249884d179dSJan Kara #endif 12507b9c7321SEric W. Biederman quota_send_warning(warn[i].w_dq_id, 1251bf097aafSJan Kara warn[i].w_sb->s_dev, warn[i].w_type); 1252884d179dSJan Kara } 1253884d179dSJan Kara } 1254884d179dSJan Kara 12557a2435d8SJan Kara static int ignore_hardlimit(struct dquot *dquot) 1256884d179dSJan Kara { 12574c376dcaSEric W. Biederman struct mem_dqinfo *info = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_id.type]; 1258884d179dSJan Kara 1259884d179dSJan Kara return capable(CAP_SYS_RESOURCE) && 1260268157baSJan Kara (info->dqi_format->qf_fmt_id != QFMT_VFS_OLD || 12619c45101eSJan Kara !(info->dqi_flags & DQF_ROOT_SQUASH)); 1262884d179dSJan Kara } 1263884d179dSJan Kara 1264884d179dSJan Kara /* needs dq_data_lock */ 1265bf097aafSJan Kara static int check_idq(struct dquot *dquot, qsize_t inodes, 1266bf097aafSJan Kara struct dquot_warn *warn) 1267884d179dSJan Kara { 1268268157baSJan Kara qsize_t newinodes = dquot->dq_dqb.dqb_curinodes + inodes; 1269268157baSJan Kara 12704c376dcaSEric W. Biederman if (!sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_id.type) || 1271884d179dSJan Kara test_bit(DQ_FAKE_B, &dquot->dq_flags)) 1272efd8f0e6SChristoph Hellwig return 0; 1273884d179dSJan Kara 1274884d179dSJan Kara if (dquot->dq_dqb.dqb_ihardlimit && 1275268157baSJan Kara newinodes > dquot->dq_dqb.dqb_ihardlimit && 1276884d179dSJan Kara !ignore_hardlimit(dquot)) { 1277bf097aafSJan Kara prepare_warning(warn, dquot, QUOTA_NL_IHARDWARN); 1278efd8f0e6SChristoph Hellwig return -EDQUOT; 1279884d179dSJan Kara } 1280884d179dSJan Kara 1281884d179dSJan Kara if (dquot->dq_dqb.dqb_isoftlimit && 1282268157baSJan Kara newinodes > dquot->dq_dqb.dqb_isoftlimit && 1283268157baSJan Kara dquot->dq_dqb.dqb_itime && 1284e008bb61SArnd Bergmann ktime_get_real_seconds() >= dquot->dq_dqb.dqb_itime && 1285884d179dSJan Kara !ignore_hardlimit(dquot)) { 1286bf097aafSJan Kara prepare_warning(warn, dquot, QUOTA_NL_ISOFTLONGWARN); 1287efd8f0e6SChristoph Hellwig return -EDQUOT; 1288884d179dSJan Kara } 1289884d179dSJan Kara 1290884d179dSJan Kara if (dquot->dq_dqb.dqb_isoftlimit && 1291268157baSJan Kara newinodes > dquot->dq_dqb.dqb_isoftlimit && 1292884d179dSJan Kara dquot->dq_dqb.dqb_itime == 0) { 1293bf097aafSJan Kara prepare_warning(warn, dquot, QUOTA_NL_ISOFTWARN); 1294e008bb61SArnd Bergmann dquot->dq_dqb.dqb_itime = ktime_get_real_seconds() + 12954c376dcaSEric W. Biederman sb_dqopt(dquot->dq_sb)->info[dquot->dq_id.type].dqi_igrace; 1296884d179dSJan Kara } 1297884d179dSJan Kara 1298efd8f0e6SChristoph Hellwig return 0; 1299884d179dSJan Kara } 1300884d179dSJan Kara 1301884d179dSJan Kara /* needs dq_data_lock */ 1302bf097aafSJan Kara static int check_bdq(struct dquot *dquot, qsize_t space, int prealloc, 1303bf097aafSJan Kara struct dquot_warn *warn) 1304884d179dSJan Kara { 1305884d179dSJan Kara qsize_t tspace; 1306268157baSJan Kara struct super_block *sb = dquot->dq_sb; 1307884d179dSJan Kara 13084c376dcaSEric W. Biederman if (!sb_has_quota_limits_enabled(sb, dquot->dq_id.type) || 1309884d179dSJan Kara test_bit(DQ_FAKE_B, &dquot->dq_flags)) 1310efd8f0e6SChristoph Hellwig return 0; 1311884d179dSJan Kara 1312884d179dSJan Kara tspace = dquot->dq_dqb.dqb_curspace + dquot->dq_dqb.dqb_rsvspace 1313884d179dSJan Kara + space; 1314884d179dSJan Kara 1315884d179dSJan Kara if (dquot->dq_dqb.dqb_bhardlimit && 1316884d179dSJan Kara tspace > dquot->dq_dqb.dqb_bhardlimit && 1317884d179dSJan Kara !ignore_hardlimit(dquot)) { 1318884d179dSJan Kara if (!prealloc) 1319bf097aafSJan Kara prepare_warning(warn, dquot, QUOTA_NL_BHARDWARN); 1320efd8f0e6SChristoph Hellwig return -EDQUOT; 1321884d179dSJan Kara } 1322884d179dSJan Kara 1323884d179dSJan Kara if (dquot->dq_dqb.dqb_bsoftlimit && 1324884d179dSJan Kara tspace > dquot->dq_dqb.dqb_bsoftlimit && 1325268157baSJan Kara dquot->dq_dqb.dqb_btime && 1326e008bb61SArnd Bergmann ktime_get_real_seconds() >= dquot->dq_dqb.dqb_btime && 1327884d179dSJan Kara !ignore_hardlimit(dquot)) { 1328884d179dSJan Kara if (!prealloc) 1329bf097aafSJan Kara prepare_warning(warn, dquot, QUOTA_NL_BSOFTLONGWARN); 1330efd8f0e6SChristoph Hellwig return -EDQUOT; 1331884d179dSJan Kara } 1332884d179dSJan Kara 1333884d179dSJan Kara if (dquot->dq_dqb.dqb_bsoftlimit && 1334884d179dSJan Kara tspace > dquot->dq_dqb.dqb_bsoftlimit && 1335884d179dSJan Kara dquot->dq_dqb.dqb_btime == 0) { 1336884d179dSJan Kara if (!prealloc) { 1337bf097aafSJan Kara prepare_warning(warn, dquot, QUOTA_NL_BSOFTWARN); 1338e008bb61SArnd Bergmann dquot->dq_dqb.dqb_btime = ktime_get_real_seconds() + 13394c376dcaSEric W. Biederman sb_dqopt(sb)->info[dquot->dq_id.type].dqi_bgrace; 1340884d179dSJan Kara } 1341884d179dSJan Kara else 1342884d179dSJan Kara /* 1343884d179dSJan Kara * We don't allow preallocation to exceed softlimit so exceeding will 1344884d179dSJan Kara * be always printed 1345884d179dSJan Kara */ 1346efd8f0e6SChristoph Hellwig return -EDQUOT; 1347884d179dSJan Kara } 1348884d179dSJan Kara 1349efd8f0e6SChristoph Hellwig return 0; 1350884d179dSJan Kara } 1351884d179dSJan Kara 1352884d179dSJan Kara static int info_idq_free(struct dquot *dquot, qsize_t inodes) 1353884d179dSJan Kara { 1354268157baSJan Kara qsize_t newinodes; 1355268157baSJan Kara 1356884d179dSJan Kara if (test_bit(DQ_FAKE_B, &dquot->dq_flags) || 1357884d179dSJan Kara dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit || 13584c376dcaSEric W. Biederman !sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_id.type)) 1359884d179dSJan Kara return QUOTA_NL_NOWARN; 1360884d179dSJan Kara 1361268157baSJan Kara newinodes = dquot->dq_dqb.dqb_curinodes - inodes; 1362268157baSJan Kara if (newinodes <= dquot->dq_dqb.dqb_isoftlimit) 1363884d179dSJan Kara return QUOTA_NL_ISOFTBELOW; 1364884d179dSJan Kara if (dquot->dq_dqb.dqb_curinodes >= dquot->dq_dqb.dqb_ihardlimit && 1365268157baSJan Kara newinodes < dquot->dq_dqb.dqb_ihardlimit) 1366884d179dSJan Kara return QUOTA_NL_IHARDBELOW; 1367884d179dSJan Kara return QUOTA_NL_NOWARN; 1368884d179dSJan Kara } 1369884d179dSJan Kara 1370884d179dSJan Kara static int info_bdq_free(struct dquot *dquot, qsize_t space) 1371884d179dSJan Kara { 1372884d179dSJan Kara if (test_bit(DQ_FAKE_B, &dquot->dq_flags) || 1373884d179dSJan Kara dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit) 1374884d179dSJan Kara return QUOTA_NL_NOWARN; 1375884d179dSJan Kara 1376884d179dSJan Kara if (dquot->dq_dqb.dqb_curspace - space <= dquot->dq_dqb.dqb_bsoftlimit) 1377884d179dSJan Kara return QUOTA_NL_BSOFTBELOW; 1378884d179dSJan Kara if (dquot->dq_dqb.dqb_curspace >= dquot->dq_dqb.dqb_bhardlimit && 1379884d179dSJan Kara dquot->dq_dqb.dqb_curspace - space < dquot->dq_dqb.dqb_bhardlimit) 1380884d179dSJan Kara return QUOTA_NL_BHARDBELOW; 1381884d179dSJan Kara return QUOTA_NL_NOWARN; 1382884d179dSJan Kara } 13830a5a9c72SJan Kara 1384189eef59SChristoph Hellwig static int dquot_active(const struct inode *inode) 1385189eef59SChristoph Hellwig { 1386189eef59SChristoph Hellwig struct super_block *sb = inode->i_sb; 1387189eef59SChristoph Hellwig 1388189eef59SChristoph Hellwig if (IS_NOQUOTA(inode)) 1389189eef59SChristoph Hellwig return 0; 1390189eef59SChristoph Hellwig return sb_any_quota_loaded(sb) & ~sb_any_quota_suspended(sb); 1391189eef59SChristoph Hellwig } 1392189eef59SChristoph Hellwig 1393884d179dSJan Kara /* 1394884d179dSJan Kara * Initialize quota pointers in inode 1395871a2931SChristoph Hellwig * 1396871a2931SChristoph Hellwig * It is better to call this function outside of any transaction as it 1397871a2931SChristoph Hellwig * might need a lot of space in journal for dquot structure allocation. 1398884d179dSJan Kara */ 13996184fc0bSJan Kara static int __dquot_initialize(struct inode *inode, int type) 1400884d179dSJan Kara { 14011ea06becSNiu Yawei int cnt, init_needed = 0; 1402ab73ef46SNikolay Borisov struct dquot **dquots, *got[MAXQUOTAS] = {}; 1403884d179dSJan Kara struct super_block *sb = inode->i_sb; 14040a5a9c72SJan Kara qsize_t rsv; 14056184fc0bSJan Kara int ret = 0; 1406884d179dSJan Kara 1407189eef59SChristoph Hellwig if (!dquot_active(inode)) 14086184fc0bSJan Kara return 0; 1409884d179dSJan Kara 14105bcd3b6fSKonstantin Khlebnikov dquots = i_dquot(inode); 14115bcd3b6fSKonstantin Khlebnikov 1412884d179dSJan Kara /* First get references to structures we might need. */ 1413884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1414aca645a6SEric W. Biederman struct kqid qid; 1415847aac64SLi Xi kprojid_t projid; 1416847aac64SLi Xi int rc; 14176184fc0bSJan Kara struct dquot *dquot; 1418847aac64SLi Xi 1419884d179dSJan Kara if (type != -1 && cnt != type) 1420884d179dSJan Kara continue; 14211ea06becSNiu Yawei /* 14221ea06becSNiu Yawei * The i_dquot should have been initialized in most cases, 14231ea06becSNiu Yawei * we check it without locking here to avoid unnecessary 14241ea06becSNiu Yawei * dqget()/dqput() calls. 14251ea06becSNiu Yawei */ 14265bcd3b6fSKonstantin Khlebnikov if (dquots[cnt]) 14271ea06becSNiu Yawei continue; 1428847aac64SLi Xi 1429847aac64SLi Xi if (!sb_has_quota_active(sb, cnt)) 1430847aac64SLi Xi continue; 1431847aac64SLi Xi 14321ea06becSNiu Yawei init_needed = 1; 14331ea06becSNiu Yawei 1434884d179dSJan Kara switch (cnt) { 1435884d179dSJan Kara case USRQUOTA: 1436aca645a6SEric W. Biederman qid = make_kqid_uid(inode->i_uid); 1437884d179dSJan Kara break; 1438884d179dSJan Kara case GRPQUOTA: 1439aca645a6SEric W. Biederman qid = make_kqid_gid(inode->i_gid); 1440884d179dSJan Kara break; 1441847aac64SLi Xi case PRJQUOTA: 1442847aac64SLi Xi rc = inode->i_sb->dq_op->get_projid(inode, &projid); 1443847aac64SLi Xi if (rc) 1444847aac64SLi Xi continue; 1445847aac64SLi Xi qid = make_kqid_projid(projid); 1446847aac64SLi Xi break; 1447884d179dSJan Kara } 14486184fc0bSJan Kara dquot = dqget(sb, qid); 14496184fc0bSJan Kara if (IS_ERR(dquot)) { 14506184fc0bSJan Kara /* We raced with somebody turning quotas off... */ 14516184fc0bSJan Kara if (PTR_ERR(dquot) != -ESRCH) { 14526184fc0bSJan Kara ret = PTR_ERR(dquot); 14536184fc0bSJan Kara goto out_put; 14546184fc0bSJan Kara } 14556184fc0bSJan Kara dquot = NULL; 14566184fc0bSJan Kara } 14576184fc0bSJan Kara got[cnt] = dquot; 1458884d179dSJan Kara } 1459884d179dSJan Kara 14601ea06becSNiu Yawei /* All required i_dquot has been initialized */ 14611ea06becSNiu Yawei if (!init_needed) 14626184fc0bSJan Kara return 0; 14631ea06becSNiu Yawei 1464b9ba6f94SNiu Yawei spin_lock(&dq_data_lock); 1465884d179dSJan Kara if (IS_NOQUOTA(inode)) 14666184fc0bSJan Kara goto out_lock; 1467884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1468884d179dSJan Kara if (type != -1 && cnt != type) 1469884d179dSJan Kara continue; 1470884d179dSJan Kara /* Avoid races with quotaoff() */ 1471884d179dSJan Kara if (!sb_has_quota_active(sb, cnt)) 1472884d179dSJan Kara continue; 14734408ea41SJan Kara /* We could race with quotaon or dqget() could have failed */ 14744408ea41SJan Kara if (!got[cnt]) 14754408ea41SJan Kara continue; 14765bcd3b6fSKonstantin Khlebnikov if (!dquots[cnt]) { 14775bcd3b6fSKonstantin Khlebnikov dquots[cnt] = got[cnt]; 1478dd6f3c6dSJan Kara got[cnt] = NULL; 14790a5a9c72SJan Kara /* 14800a5a9c72SJan Kara * Make quota reservation system happy if someone 14810a5a9c72SJan Kara * did a write before quota was turned on 14820a5a9c72SJan Kara */ 14830a5a9c72SJan Kara rsv = inode_get_rsv_space(inode); 1484b9ba6f94SNiu Yawei if (unlikely(rsv)) 14855bcd3b6fSKonstantin Khlebnikov dquot_resv_space(dquots[cnt], rsv); 1486884d179dSJan Kara } 1487884d179dSJan Kara } 14886184fc0bSJan Kara out_lock: 1489b9ba6f94SNiu Yawei spin_unlock(&dq_data_lock); 14906184fc0bSJan Kara out_put: 1491884d179dSJan Kara /* Drop unused references */ 1492dc52dd3aSDmitry Monakhov dqput_all(got); 14936184fc0bSJan Kara 14946184fc0bSJan Kara return ret; 1495871a2931SChristoph Hellwig } 1496871a2931SChristoph Hellwig 14976184fc0bSJan Kara int dquot_initialize(struct inode *inode) 1498871a2931SChristoph Hellwig { 14996184fc0bSJan Kara return __dquot_initialize(inode, -1); 1500884d179dSJan Kara } 1501884d179dSJan Kara EXPORT_SYMBOL(dquot_initialize); 1502884d179dSJan Kara 1503b8cb5a54STahsin Erdogan bool dquot_initialize_needed(struct inode *inode) 1504b8cb5a54STahsin Erdogan { 1505b8cb5a54STahsin Erdogan struct dquot **dquots; 1506b8cb5a54STahsin Erdogan int i; 1507b8cb5a54STahsin Erdogan 1508b8cb5a54STahsin Erdogan if (!dquot_active(inode)) 1509b8cb5a54STahsin Erdogan return false; 1510b8cb5a54STahsin Erdogan 1511b8cb5a54STahsin Erdogan dquots = i_dquot(inode); 1512b8cb5a54STahsin Erdogan for (i = 0; i < MAXQUOTAS; i++) 1513b8cb5a54STahsin Erdogan if (!dquots[i] && sb_has_quota_active(inode->i_sb, i)) 1514b8cb5a54STahsin Erdogan return true; 1515b8cb5a54STahsin Erdogan return false; 1516b8cb5a54STahsin Erdogan } 1517b8cb5a54STahsin Erdogan EXPORT_SYMBOL(dquot_initialize_needed); 1518b8cb5a54STahsin Erdogan 1519884d179dSJan Kara /* 1520b9ba6f94SNiu Yawei * Release all quotas referenced by inode. 1521b9ba6f94SNiu Yawei * 1522b9ba6f94SNiu Yawei * This function only be called on inode free or converting 1523b9ba6f94SNiu Yawei * a file to quota file, no other users for the i_dquot in 1524b9ba6f94SNiu Yawei * both cases, so we needn't call synchronize_srcu() after 1525b9ba6f94SNiu Yawei * clearing i_dquot. 1526884d179dSJan Kara */ 15279f754758SChristoph Hellwig static void __dquot_drop(struct inode *inode) 1528884d179dSJan Kara { 1529884d179dSJan Kara int cnt; 15305bcd3b6fSKonstantin Khlebnikov struct dquot **dquots = i_dquot(inode); 1531884d179dSJan Kara struct dquot *put[MAXQUOTAS]; 1532884d179dSJan Kara 1533b9ba6f94SNiu Yawei spin_lock(&dq_data_lock); 1534884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 15355bcd3b6fSKonstantin Khlebnikov put[cnt] = dquots[cnt]; 15365bcd3b6fSKonstantin Khlebnikov dquots[cnt] = NULL; 1537884d179dSJan Kara } 1538b9ba6f94SNiu Yawei spin_unlock(&dq_data_lock); 1539dc52dd3aSDmitry Monakhov dqput_all(put); 1540884d179dSJan Kara } 1541884d179dSJan Kara 15429f754758SChristoph Hellwig void dquot_drop(struct inode *inode) 1543884d179dSJan Kara { 15445bcd3b6fSKonstantin Khlebnikov struct dquot * const *dquots; 1545884d179dSJan Kara int cnt; 15469f754758SChristoph Hellwig 15479f754758SChristoph Hellwig if (IS_NOQUOTA(inode)) 15489f754758SChristoph Hellwig return; 15499f754758SChristoph Hellwig 15509f754758SChristoph Hellwig /* 15519f754758SChristoph Hellwig * Test before calling to rule out calls from proc and such 1552884d179dSJan Kara * where we are not allowed to block. Note that this is 1553884d179dSJan Kara * actually reliable test even without the lock - the caller 1554884d179dSJan Kara * must assure that nobody can come after the DQUOT_DROP and 15559f754758SChristoph Hellwig * add quota pointers back anyway. 15569f754758SChristoph Hellwig */ 15575bcd3b6fSKonstantin Khlebnikov dquots = i_dquot(inode); 15589f754758SChristoph Hellwig for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 15595bcd3b6fSKonstantin Khlebnikov if (dquots[cnt]) 1560884d179dSJan Kara break; 15619f754758SChristoph Hellwig } 15629f754758SChristoph Hellwig 1563884d179dSJan Kara if (cnt < MAXQUOTAS) 15649f754758SChristoph Hellwig __dquot_drop(inode); 1565884d179dSJan Kara } 15669f754758SChristoph Hellwig EXPORT_SYMBOL(dquot_drop); 1567884d179dSJan Kara 1568884d179dSJan Kara /* 1569fd8fbfc1SDmitry Monakhov * inode_reserved_space is managed internally by quota, and protected by 1570fd8fbfc1SDmitry Monakhov * i_lock similar to i_blocks+i_bytes. 1571fd8fbfc1SDmitry Monakhov */ 1572fd8fbfc1SDmitry Monakhov static qsize_t *inode_reserved_space(struct inode * inode) 1573fd8fbfc1SDmitry Monakhov { 1574fd8fbfc1SDmitry Monakhov /* Filesystem must explicitly define it's own method in order to use 1575fd8fbfc1SDmitry Monakhov * quota reservation interface */ 1576fd8fbfc1SDmitry Monakhov BUG_ON(!inode->i_sb->dq_op->get_reserved_space); 1577fd8fbfc1SDmitry Monakhov return inode->i_sb->dq_op->get_reserved_space(inode); 1578fd8fbfc1SDmitry Monakhov } 1579fd8fbfc1SDmitry Monakhov 1580c469070aSDmitry Monakhov void inode_add_rsv_space(struct inode *inode, qsize_t number) 1581fd8fbfc1SDmitry Monakhov { 1582fd8fbfc1SDmitry Monakhov spin_lock(&inode->i_lock); 1583fd8fbfc1SDmitry Monakhov *inode_reserved_space(inode) += number; 1584fd8fbfc1SDmitry Monakhov spin_unlock(&inode->i_lock); 1585fd8fbfc1SDmitry Monakhov } 1586c469070aSDmitry Monakhov EXPORT_SYMBOL(inode_add_rsv_space); 1587fd8fbfc1SDmitry Monakhov 1588c469070aSDmitry Monakhov void inode_claim_rsv_space(struct inode *inode, qsize_t number) 1589fd8fbfc1SDmitry Monakhov { 1590fd8fbfc1SDmitry Monakhov spin_lock(&inode->i_lock); 1591fd8fbfc1SDmitry Monakhov *inode_reserved_space(inode) -= number; 1592fd8fbfc1SDmitry Monakhov __inode_add_bytes(inode, number); 1593fd8fbfc1SDmitry Monakhov spin_unlock(&inode->i_lock); 1594fd8fbfc1SDmitry Monakhov } 1595c469070aSDmitry Monakhov EXPORT_SYMBOL(inode_claim_rsv_space); 1596fd8fbfc1SDmitry Monakhov 15971c8924ebSJan Kara void inode_reclaim_rsv_space(struct inode *inode, qsize_t number) 15981c8924ebSJan Kara { 15991c8924ebSJan Kara spin_lock(&inode->i_lock); 16001c8924ebSJan Kara *inode_reserved_space(inode) += number; 16011c8924ebSJan Kara __inode_sub_bytes(inode, number); 16021c8924ebSJan Kara spin_unlock(&inode->i_lock); 16031c8924ebSJan Kara } 16041c8924ebSJan Kara EXPORT_SYMBOL(inode_reclaim_rsv_space); 16051c8924ebSJan Kara 1606c469070aSDmitry Monakhov void inode_sub_rsv_space(struct inode *inode, qsize_t number) 1607fd8fbfc1SDmitry Monakhov { 1608fd8fbfc1SDmitry Monakhov spin_lock(&inode->i_lock); 1609fd8fbfc1SDmitry Monakhov *inode_reserved_space(inode) -= number; 1610fd8fbfc1SDmitry Monakhov spin_unlock(&inode->i_lock); 1611fd8fbfc1SDmitry Monakhov } 1612c469070aSDmitry Monakhov EXPORT_SYMBOL(inode_sub_rsv_space); 1613fd8fbfc1SDmitry Monakhov 1614fd8fbfc1SDmitry Monakhov static qsize_t inode_get_rsv_space(struct inode *inode) 1615fd8fbfc1SDmitry Monakhov { 1616fd8fbfc1SDmitry Monakhov qsize_t ret; 161705b5d898SJan Kara 161805b5d898SJan Kara if (!inode->i_sb->dq_op->get_reserved_space) 161905b5d898SJan Kara return 0; 1620fd8fbfc1SDmitry Monakhov spin_lock(&inode->i_lock); 1621fd8fbfc1SDmitry Monakhov ret = *inode_reserved_space(inode); 1622fd8fbfc1SDmitry Monakhov spin_unlock(&inode->i_lock); 1623fd8fbfc1SDmitry Monakhov return ret; 1624fd8fbfc1SDmitry Monakhov } 1625fd8fbfc1SDmitry Monakhov 1626fd8fbfc1SDmitry Monakhov static void inode_incr_space(struct inode *inode, qsize_t number, 1627fd8fbfc1SDmitry Monakhov int reserve) 1628fd8fbfc1SDmitry Monakhov { 1629fd8fbfc1SDmitry Monakhov if (reserve) 1630fd8fbfc1SDmitry Monakhov inode_add_rsv_space(inode, number); 1631fd8fbfc1SDmitry Monakhov else 1632fd8fbfc1SDmitry Monakhov inode_add_bytes(inode, number); 1633fd8fbfc1SDmitry Monakhov } 1634fd8fbfc1SDmitry Monakhov 1635fd8fbfc1SDmitry Monakhov static void inode_decr_space(struct inode *inode, qsize_t number, int reserve) 1636fd8fbfc1SDmitry Monakhov { 1637fd8fbfc1SDmitry Monakhov if (reserve) 1638fd8fbfc1SDmitry Monakhov inode_sub_rsv_space(inode, number); 1639fd8fbfc1SDmitry Monakhov else 1640fd8fbfc1SDmitry Monakhov inode_sub_bytes(inode, number); 1641fd8fbfc1SDmitry Monakhov } 1642fd8fbfc1SDmitry Monakhov 1643fd8fbfc1SDmitry Monakhov /* 16445dd4056dSChristoph Hellwig * This functions updates i_blocks+i_bytes fields and quota information 16455dd4056dSChristoph Hellwig * (together with appropriate checks). 16465dd4056dSChristoph Hellwig * 16475dd4056dSChristoph Hellwig * NOTE: We absolutely rely on the fact that caller dirties the inode 16485dd4056dSChristoph Hellwig * (usually helpers in quotaops.h care about this) and holds a handle for 16495dd4056dSChristoph Hellwig * the current transaction so that dquot write and inode write go into the 16505dd4056dSChristoph Hellwig * same transaction. 1651884d179dSJan Kara */ 1652884d179dSJan Kara 1653884d179dSJan Kara /* 1654884d179dSJan Kara * This operation can block, but only after everything is updated 1655884d179dSJan Kara */ 165656246f9aSEric Sandeen int __dquot_alloc_space(struct inode *inode, qsize_t number, int flags) 1657884d179dSJan Kara { 1658b9ba6f94SNiu Yawei int cnt, ret = 0, index; 1659bf097aafSJan Kara struct dquot_warn warn[MAXQUOTAS]; 166056246f9aSEric Sandeen int reserve = flags & DQUOT_SPACE_RESERVE; 16615bcd3b6fSKonstantin Khlebnikov struct dquot **dquots; 1662884d179dSJan Kara 1663189eef59SChristoph Hellwig if (!dquot_active(inode)) { 1664fd8fbfc1SDmitry Monakhov inode_incr_space(inode, number, reserve); 1665fd8fbfc1SDmitry Monakhov goto out; 1666fd8fbfc1SDmitry Monakhov } 1667fd8fbfc1SDmitry Monakhov 1668884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 1669bf097aafSJan Kara warn[cnt].w_type = QUOTA_NL_NOWARN; 1670884d179dSJan Kara 16715bcd3b6fSKonstantin Khlebnikov dquots = i_dquot(inode); 1672b9ba6f94SNiu Yawei index = srcu_read_lock(&dquot_srcu); 1673884d179dSJan Kara spin_lock(&dq_data_lock); 1674884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1675bf097aafSJan Kara if (!dquots[cnt]) 1676884d179dSJan Kara continue; 1677bf097aafSJan Kara ret = check_bdq(dquots[cnt], number, 1678bf097aafSJan Kara !(flags & DQUOT_SPACE_WARN), &warn[cnt]); 1679bf097aafSJan Kara if (ret && !(flags & DQUOT_SPACE_NOFAIL)) { 1680fd8fbfc1SDmitry Monakhov spin_unlock(&dq_data_lock); 1681fd8fbfc1SDmitry Monakhov goto out_flush_warn; 1682884d179dSJan Kara } 1683884d179dSJan Kara } 1684884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1685bf097aafSJan Kara if (!dquots[cnt]) 1686884d179dSJan Kara continue; 1687884d179dSJan Kara if (reserve) 1688bf097aafSJan Kara dquot_resv_space(dquots[cnt], number); 1689884d179dSJan Kara else 1690bf097aafSJan Kara dquot_incr_space(dquots[cnt], number); 1691884d179dSJan Kara } 1692fd8fbfc1SDmitry Monakhov inode_incr_space(inode, number, reserve); 1693884d179dSJan Kara spin_unlock(&dq_data_lock); 1694fd8fbfc1SDmitry Monakhov 1695fd8fbfc1SDmitry Monakhov if (reserve) 1696fd8fbfc1SDmitry Monakhov goto out_flush_warn; 1697bf097aafSJan Kara mark_all_dquot_dirty(dquots); 1698fd8fbfc1SDmitry Monakhov out_flush_warn: 1699b9ba6f94SNiu Yawei srcu_read_unlock(&dquot_srcu, index); 1700bf097aafSJan Kara flush_warnings(warn); 1701fd8fbfc1SDmitry Monakhov out: 1702884d179dSJan Kara return ret; 1703884d179dSJan Kara } 17045dd4056dSChristoph Hellwig EXPORT_SYMBOL(__dquot_alloc_space); 1705884d179dSJan Kara 1706884d179dSJan Kara /* 1707884d179dSJan Kara * This operation can block, but only after everything is updated 1708884d179dSJan Kara */ 17096bab3596SJan Kara int dquot_alloc_inode(struct inode *inode) 1710884d179dSJan Kara { 1711b9ba6f94SNiu Yawei int cnt, ret = 0, index; 1712bf097aafSJan Kara struct dquot_warn warn[MAXQUOTAS]; 17135bcd3b6fSKonstantin Khlebnikov struct dquot * const *dquots; 1714884d179dSJan Kara 1715189eef59SChristoph Hellwig if (!dquot_active(inode)) 171663936ddaSChristoph Hellwig return 0; 1717884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 1718bf097aafSJan Kara warn[cnt].w_type = QUOTA_NL_NOWARN; 1719b9ba6f94SNiu Yawei 17205bcd3b6fSKonstantin Khlebnikov dquots = i_dquot(inode); 1721b9ba6f94SNiu Yawei index = srcu_read_lock(&dquot_srcu); 1722884d179dSJan Kara spin_lock(&dq_data_lock); 1723884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1724bf097aafSJan Kara if (!dquots[cnt]) 1725884d179dSJan Kara continue; 1726bf097aafSJan Kara ret = check_idq(dquots[cnt], 1, &warn[cnt]); 1727efd8f0e6SChristoph Hellwig if (ret) 1728884d179dSJan Kara goto warn_put_all; 1729884d179dSJan Kara } 1730884d179dSJan Kara 1731884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1732bf097aafSJan Kara if (!dquots[cnt]) 1733884d179dSJan Kara continue; 1734bf097aafSJan Kara dquot_incr_inodes(dquots[cnt], 1); 1735884d179dSJan Kara } 1736efd8f0e6SChristoph Hellwig 1737884d179dSJan Kara warn_put_all: 1738884d179dSJan Kara spin_unlock(&dq_data_lock); 173963936ddaSChristoph Hellwig if (ret == 0) 1740bf097aafSJan Kara mark_all_dquot_dirty(dquots); 1741b9ba6f94SNiu Yawei srcu_read_unlock(&dquot_srcu, index); 1742bf097aafSJan Kara flush_warnings(warn); 1743884d179dSJan Kara return ret; 1744884d179dSJan Kara } 1745884d179dSJan Kara EXPORT_SYMBOL(dquot_alloc_inode); 1746884d179dSJan Kara 17475dd4056dSChristoph Hellwig /* 17485dd4056dSChristoph Hellwig * Convert in-memory reserved quotas to real consumed quotas 17495dd4056dSChristoph Hellwig */ 17505dd4056dSChristoph Hellwig int dquot_claim_space_nodirty(struct inode *inode, qsize_t number) 1751884d179dSJan Kara { 17525bcd3b6fSKonstantin Khlebnikov struct dquot **dquots; 1753b9ba6f94SNiu Yawei int cnt, index; 1754884d179dSJan Kara 1755189eef59SChristoph Hellwig if (!dquot_active(inode)) { 1756fd8fbfc1SDmitry Monakhov inode_claim_rsv_space(inode, number); 17575dd4056dSChristoph Hellwig return 0; 1758884d179dSJan Kara } 1759884d179dSJan Kara 17605bcd3b6fSKonstantin Khlebnikov dquots = i_dquot(inode); 1761b9ba6f94SNiu Yawei index = srcu_read_lock(&dquot_srcu); 1762884d179dSJan Kara spin_lock(&dq_data_lock); 1763884d179dSJan Kara /* Claim reserved quotas to allocated quotas */ 1764884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 17655bcd3b6fSKonstantin Khlebnikov if (dquots[cnt]) 17665bcd3b6fSKonstantin Khlebnikov dquot_claim_reserved_space(dquots[cnt], number); 1767884d179dSJan Kara } 1768884d179dSJan Kara /* Update inode bytes */ 1769fd8fbfc1SDmitry Monakhov inode_claim_rsv_space(inode, number); 1770884d179dSJan Kara spin_unlock(&dq_data_lock); 17715bcd3b6fSKonstantin Khlebnikov mark_all_dquot_dirty(dquots); 1772b9ba6f94SNiu Yawei srcu_read_unlock(&dquot_srcu, index); 17735dd4056dSChristoph Hellwig return 0; 1774884d179dSJan Kara } 17755dd4056dSChristoph Hellwig EXPORT_SYMBOL(dquot_claim_space_nodirty); 1776884d179dSJan Kara 1777884d179dSJan Kara /* 17781c8924ebSJan Kara * Convert allocated space back to in-memory reserved quotas 17791c8924ebSJan Kara */ 17801c8924ebSJan Kara void dquot_reclaim_space_nodirty(struct inode *inode, qsize_t number) 17811c8924ebSJan Kara { 17825bcd3b6fSKonstantin Khlebnikov struct dquot **dquots; 1783b9ba6f94SNiu Yawei int cnt, index; 17841c8924ebSJan Kara 17851c8924ebSJan Kara if (!dquot_active(inode)) { 17861c8924ebSJan Kara inode_reclaim_rsv_space(inode, number); 17871c8924ebSJan Kara return; 17881c8924ebSJan Kara } 17891c8924ebSJan Kara 17905bcd3b6fSKonstantin Khlebnikov dquots = i_dquot(inode); 1791b9ba6f94SNiu Yawei index = srcu_read_lock(&dquot_srcu); 17921c8924ebSJan Kara spin_lock(&dq_data_lock); 17931c8924ebSJan Kara /* Claim reserved quotas to allocated quotas */ 17941c8924ebSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 17955bcd3b6fSKonstantin Khlebnikov if (dquots[cnt]) 17965bcd3b6fSKonstantin Khlebnikov dquot_reclaim_reserved_space(dquots[cnt], number); 17971c8924ebSJan Kara } 17981c8924ebSJan Kara /* Update inode bytes */ 17991c8924ebSJan Kara inode_reclaim_rsv_space(inode, number); 18001c8924ebSJan Kara spin_unlock(&dq_data_lock); 18015bcd3b6fSKonstantin Khlebnikov mark_all_dquot_dirty(dquots); 1802b9ba6f94SNiu Yawei srcu_read_unlock(&dquot_srcu, index); 18031c8924ebSJan Kara return; 18041c8924ebSJan Kara } 18051c8924ebSJan Kara EXPORT_SYMBOL(dquot_reclaim_space_nodirty); 18061c8924ebSJan Kara 18071c8924ebSJan Kara /* 1808884d179dSJan Kara * This operation can block, but only after everything is updated 1809884d179dSJan Kara */ 181056246f9aSEric Sandeen void __dquot_free_space(struct inode *inode, qsize_t number, int flags) 1811884d179dSJan Kara { 1812884d179dSJan Kara unsigned int cnt; 1813bf097aafSJan Kara struct dquot_warn warn[MAXQUOTAS]; 18145bcd3b6fSKonstantin Khlebnikov struct dquot **dquots; 1815b9ba6f94SNiu Yawei int reserve = flags & DQUOT_SPACE_RESERVE, index; 1816884d179dSJan Kara 1817189eef59SChristoph Hellwig if (!dquot_active(inode)) { 1818fd8fbfc1SDmitry Monakhov inode_decr_space(inode, number, reserve); 18195dd4056dSChristoph Hellwig return; 1820884d179dSJan Kara } 1821884d179dSJan Kara 18225bcd3b6fSKonstantin Khlebnikov dquots = i_dquot(inode); 1823b9ba6f94SNiu Yawei index = srcu_read_lock(&dquot_srcu); 1824884d179dSJan Kara spin_lock(&dq_data_lock); 1825884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1826bf097aafSJan Kara int wtype; 1827bf097aafSJan Kara 1828bf097aafSJan Kara warn[cnt].w_type = QUOTA_NL_NOWARN; 1829bf097aafSJan Kara if (!dquots[cnt]) 1830884d179dSJan Kara continue; 1831bf097aafSJan Kara wtype = info_bdq_free(dquots[cnt], number); 1832bf097aafSJan Kara if (wtype != QUOTA_NL_NOWARN) 1833bf097aafSJan Kara prepare_warning(&warn[cnt], dquots[cnt], wtype); 1834fd8fbfc1SDmitry Monakhov if (reserve) 1835bf097aafSJan Kara dquot_free_reserved_space(dquots[cnt], number); 1836fd8fbfc1SDmitry Monakhov else 1837bf097aafSJan Kara dquot_decr_space(dquots[cnt], number); 1838884d179dSJan Kara } 1839fd8fbfc1SDmitry Monakhov inode_decr_space(inode, number, reserve); 1840884d179dSJan Kara spin_unlock(&dq_data_lock); 1841fd8fbfc1SDmitry Monakhov 1842fd8fbfc1SDmitry Monakhov if (reserve) 1843fd8fbfc1SDmitry Monakhov goto out_unlock; 1844bf097aafSJan Kara mark_all_dquot_dirty(dquots); 1845fd8fbfc1SDmitry Monakhov out_unlock: 1846b9ba6f94SNiu Yawei srcu_read_unlock(&dquot_srcu, index); 1847bf097aafSJan Kara flush_warnings(warn); 1848884d179dSJan Kara } 18495dd4056dSChristoph Hellwig EXPORT_SYMBOL(__dquot_free_space); 1850fd8fbfc1SDmitry Monakhov 1851fd8fbfc1SDmitry Monakhov /* 1852884d179dSJan Kara * This operation can block, but only after everything is updated 1853884d179dSJan Kara */ 18546bab3596SJan Kara void dquot_free_inode(struct inode *inode) 1855884d179dSJan Kara { 1856884d179dSJan Kara unsigned int cnt; 1857bf097aafSJan Kara struct dquot_warn warn[MAXQUOTAS]; 18585bcd3b6fSKonstantin Khlebnikov struct dquot * const *dquots; 1859b9ba6f94SNiu Yawei int index; 1860884d179dSJan Kara 1861189eef59SChristoph Hellwig if (!dquot_active(inode)) 186263936ddaSChristoph Hellwig return; 1863884d179dSJan Kara 18645bcd3b6fSKonstantin Khlebnikov dquots = i_dquot(inode); 1865b9ba6f94SNiu Yawei index = srcu_read_lock(&dquot_srcu); 1866884d179dSJan Kara spin_lock(&dq_data_lock); 1867884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1868bf097aafSJan Kara int wtype; 1869bf097aafSJan Kara 1870bf097aafSJan Kara warn[cnt].w_type = QUOTA_NL_NOWARN; 1871bf097aafSJan Kara if (!dquots[cnt]) 1872884d179dSJan Kara continue; 1873bf097aafSJan Kara wtype = info_idq_free(dquots[cnt], 1); 1874bf097aafSJan Kara if (wtype != QUOTA_NL_NOWARN) 1875bf097aafSJan Kara prepare_warning(&warn[cnt], dquots[cnt], wtype); 1876bf097aafSJan Kara dquot_decr_inodes(dquots[cnt], 1); 1877884d179dSJan Kara } 1878884d179dSJan Kara spin_unlock(&dq_data_lock); 1879bf097aafSJan Kara mark_all_dquot_dirty(dquots); 1880b9ba6f94SNiu Yawei srcu_read_unlock(&dquot_srcu, index); 1881bf097aafSJan Kara flush_warnings(warn); 1882884d179dSJan Kara } 1883884d179dSJan Kara EXPORT_SYMBOL(dquot_free_inode); 1884884d179dSJan Kara 1885884d179dSJan Kara /* 1886884d179dSJan Kara * Transfer the number of inode and blocks from one diskquota to an other. 1887bc8e5f07SJan Kara * On success, dquot references in transfer_to are consumed and references 1888bc8e5f07SJan Kara * to original dquots that need to be released are placed there. On failure, 1889bc8e5f07SJan Kara * references are kept untouched. 1890884d179dSJan Kara * 1891884d179dSJan Kara * This operation can block, but only after everything is updated 1892884d179dSJan Kara * A transaction must be started when entering this function. 1893bc8e5f07SJan Kara * 1894b9ba6f94SNiu Yawei * We are holding reference on transfer_from & transfer_to, no need to 1895b9ba6f94SNiu Yawei * protect them by srcu_read_lock(). 1896884d179dSJan Kara */ 1897bc8e5f07SJan Kara int __dquot_transfer(struct inode *inode, struct dquot **transfer_to) 1898884d179dSJan Kara { 1899884d179dSJan Kara qsize_t space, cur_space; 1900884d179dSJan Kara qsize_t rsv_space = 0; 19017a9ca53aSTahsin Erdogan qsize_t inode_usage = 1; 1902bc8e5f07SJan Kara struct dquot *transfer_from[MAXQUOTAS] = {}; 1903efd8f0e6SChristoph Hellwig int cnt, ret = 0; 19049e32784bSDmitry char is_valid[MAXQUOTAS] = {}; 1905bf097aafSJan Kara struct dquot_warn warn_to[MAXQUOTAS]; 1906bf097aafSJan Kara struct dquot_warn warn_from_inodes[MAXQUOTAS]; 1907bf097aafSJan Kara struct dquot_warn warn_from_space[MAXQUOTAS]; 1908884d179dSJan Kara 1909884d179dSJan Kara if (IS_NOQUOTA(inode)) 1910efd8f0e6SChristoph Hellwig return 0; 19117a9ca53aSTahsin Erdogan 19127a9ca53aSTahsin Erdogan if (inode->i_sb->dq_op->get_inode_usage) { 19137a9ca53aSTahsin Erdogan ret = inode->i_sb->dq_op->get_inode_usage(inode, &inode_usage); 19147a9ca53aSTahsin Erdogan if (ret) 19157a9ca53aSTahsin Erdogan return ret; 19167a9ca53aSTahsin Erdogan } 19177a9ca53aSTahsin Erdogan 1918884d179dSJan Kara /* Initialize the arrays */ 1919bf097aafSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1920bf097aafSJan Kara warn_to[cnt].w_type = QUOTA_NL_NOWARN; 1921bf097aafSJan Kara warn_from_inodes[cnt].w_type = QUOTA_NL_NOWARN; 1922bf097aafSJan Kara warn_from_space[cnt].w_type = QUOTA_NL_NOWARN; 1923bf097aafSJan Kara } 1924b9ba6f94SNiu Yawei 1925b9ba6f94SNiu Yawei spin_lock(&dq_data_lock); 1926884d179dSJan Kara if (IS_NOQUOTA(inode)) { /* File without quota accounting? */ 1927b9ba6f94SNiu Yawei spin_unlock(&dq_data_lock); 1928bc8e5f07SJan Kara return 0; 1929884d179dSJan Kara } 1930884d179dSJan Kara cur_space = inode_get_bytes(inode); 1931fd8fbfc1SDmitry Monakhov rsv_space = inode_get_rsv_space(inode); 1932884d179dSJan Kara space = cur_space + rsv_space; 1933884d179dSJan Kara /* Build the transfer_from list and check the limits */ 1934884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 19359e32784bSDmitry /* 19369e32784bSDmitry * Skip changes for same uid or gid or for turned off quota-type. 19379e32784bSDmitry */ 1938dd6f3c6dSJan Kara if (!transfer_to[cnt]) 1939884d179dSJan Kara continue; 19409e32784bSDmitry /* Avoid races with quotaoff() */ 19419e32784bSDmitry if (!sb_has_quota_active(inode->i_sb, cnt)) 19429e32784bSDmitry continue; 19439e32784bSDmitry is_valid[cnt] = 1; 19442d0fa467SJan Kara transfer_from[cnt] = i_dquot(inode)[cnt]; 19457a9ca53aSTahsin Erdogan ret = check_idq(transfer_to[cnt], inode_usage, &warn_to[cnt]); 1946efd8f0e6SChristoph Hellwig if (ret) 1947efd8f0e6SChristoph Hellwig goto over_quota; 1948bf097aafSJan Kara ret = check_bdq(transfer_to[cnt], space, 0, &warn_to[cnt]); 1949efd8f0e6SChristoph Hellwig if (ret) 1950884d179dSJan Kara goto over_quota; 1951884d179dSJan Kara } 1952884d179dSJan Kara 1953884d179dSJan Kara /* 1954884d179dSJan Kara * Finally perform the needed transfer from transfer_from to transfer_to 1955884d179dSJan Kara */ 1956884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 19579e32784bSDmitry if (!is_valid[cnt]) 1958884d179dSJan Kara continue; 1959884d179dSJan Kara /* Due to IO error we might not have transfer_from[] structure */ 1960884d179dSJan Kara if (transfer_from[cnt]) { 1961bf097aafSJan Kara int wtype; 19627a9ca53aSTahsin Erdogan wtype = info_idq_free(transfer_from[cnt], inode_usage); 1963bf097aafSJan Kara if (wtype != QUOTA_NL_NOWARN) 1964bf097aafSJan Kara prepare_warning(&warn_from_inodes[cnt], 1965bf097aafSJan Kara transfer_from[cnt], wtype); 1966bf097aafSJan Kara wtype = info_bdq_free(transfer_from[cnt], space); 1967bf097aafSJan Kara if (wtype != QUOTA_NL_NOWARN) 1968bf097aafSJan Kara prepare_warning(&warn_from_space[cnt], 1969bf097aafSJan Kara transfer_from[cnt], wtype); 19707a9ca53aSTahsin Erdogan dquot_decr_inodes(transfer_from[cnt], inode_usage); 1971884d179dSJan Kara dquot_decr_space(transfer_from[cnt], cur_space); 1972884d179dSJan Kara dquot_free_reserved_space(transfer_from[cnt], 1973884d179dSJan Kara rsv_space); 1974884d179dSJan Kara } 1975884d179dSJan Kara 19767a9ca53aSTahsin Erdogan dquot_incr_inodes(transfer_to[cnt], inode_usage); 1977884d179dSJan Kara dquot_incr_space(transfer_to[cnt], cur_space); 1978884d179dSJan Kara dquot_resv_space(transfer_to[cnt], rsv_space); 1979884d179dSJan Kara 19802d0fa467SJan Kara i_dquot(inode)[cnt] = transfer_to[cnt]; 1981884d179dSJan Kara } 1982884d179dSJan Kara spin_unlock(&dq_data_lock); 1983884d179dSJan Kara 1984dc52dd3aSDmitry Monakhov mark_all_dquot_dirty(transfer_from); 1985dc52dd3aSDmitry Monakhov mark_all_dquot_dirty(transfer_to); 1986bf097aafSJan Kara flush_warnings(warn_to); 1987bf097aafSJan Kara flush_warnings(warn_from_inodes); 1988bf097aafSJan Kara flush_warnings(warn_from_space); 1989bc8e5f07SJan Kara /* Pass back references to put */ 1990dc52dd3aSDmitry Monakhov for (cnt = 0; cnt < MAXQUOTAS; cnt++) 19919e32784bSDmitry if (is_valid[cnt]) 1992bc8e5f07SJan Kara transfer_to[cnt] = transfer_from[cnt]; 199386f3cbecSJan Kara return 0; 1994884d179dSJan Kara over_quota: 1995884d179dSJan Kara spin_unlock(&dq_data_lock); 1996bf097aafSJan Kara flush_warnings(warn_to); 199786f3cbecSJan Kara return ret; 1998884d179dSJan Kara } 1999bc8e5f07SJan Kara EXPORT_SYMBOL(__dquot_transfer); 2000884d179dSJan Kara 20018ddd69d6SDmitry Monakhov /* Wrapper for transferring ownership of an inode for uid/gid only 20028ddd69d6SDmitry Monakhov * Called from FSXXX_setattr() 20038ddd69d6SDmitry Monakhov */ 2004b43fa828SChristoph Hellwig int dquot_transfer(struct inode *inode, struct iattr *iattr) 2005884d179dSJan Kara { 2006bc8e5f07SJan Kara struct dquot *transfer_to[MAXQUOTAS] = {}; 20076184fc0bSJan Kara struct dquot *dquot; 2008bc8e5f07SJan Kara struct super_block *sb = inode->i_sb; 2009bc8e5f07SJan Kara int ret; 20108ddd69d6SDmitry Monakhov 2011189eef59SChristoph Hellwig if (!dquot_active(inode)) 2012884d179dSJan Kara return 0; 2013bc8e5f07SJan Kara 20146184fc0bSJan Kara if (iattr->ia_valid & ATTR_UID && !uid_eq(iattr->ia_uid, inode->i_uid)){ 20156184fc0bSJan Kara dquot = dqget(sb, make_kqid_uid(iattr->ia_uid)); 20166184fc0bSJan Kara if (IS_ERR(dquot)) { 20176184fc0bSJan Kara if (PTR_ERR(dquot) != -ESRCH) { 20186184fc0bSJan Kara ret = PTR_ERR(dquot); 20196184fc0bSJan Kara goto out_put; 20206184fc0bSJan Kara } 20216184fc0bSJan Kara dquot = NULL; 20226184fc0bSJan Kara } 20236184fc0bSJan Kara transfer_to[USRQUOTA] = dquot; 20246184fc0bSJan Kara } 20256184fc0bSJan Kara if (iattr->ia_valid & ATTR_GID && !gid_eq(iattr->ia_gid, inode->i_gid)){ 20266184fc0bSJan Kara dquot = dqget(sb, make_kqid_gid(iattr->ia_gid)); 20276184fc0bSJan Kara if (IS_ERR(dquot)) { 20286184fc0bSJan Kara if (PTR_ERR(dquot) != -ESRCH) { 20296184fc0bSJan Kara ret = PTR_ERR(dquot); 20306184fc0bSJan Kara goto out_put; 20316184fc0bSJan Kara } 20326184fc0bSJan Kara dquot = NULL; 20336184fc0bSJan Kara } 20346184fc0bSJan Kara transfer_to[GRPQUOTA] = dquot; 20356184fc0bSJan Kara } 2036bc8e5f07SJan Kara ret = __dquot_transfer(inode, transfer_to); 20376184fc0bSJan Kara out_put: 2038bc8e5f07SJan Kara dqput_all(transfer_to); 2039bc8e5f07SJan Kara return ret; 2040884d179dSJan Kara } 2041b43fa828SChristoph Hellwig EXPORT_SYMBOL(dquot_transfer); 2042884d179dSJan Kara 2043884d179dSJan Kara /* 2044884d179dSJan Kara * Write info of quota file to disk 2045884d179dSJan Kara */ 2046884d179dSJan Kara int dquot_commit_info(struct super_block *sb, int type) 2047884d179dSJan Kara { 2048884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 2049884d179dSJan Kara 20509a8ae30eSJan Kara return dqopt->ops[type]->write_file_info(sb, type); 2051884d179dSJan Kara } 2052884d179dSJan Kara EXPORT_SYMBOL(dquot_commit_info); 2053884d179dSJan Kara 2054be6257b2SJan Kara int dquot_get_next_id(struct super_block *sb, struct kqid *qid) 2055be6257b2SJan Kara { 2056be6257b2SJan Kara struct quota_info *dqopt = sb_dqopt(sb); 2057be6257b2SJan Kara 20589d1ccbe7SJan Kara if (!sb_has_quota_active(sb, qid->type)) 20599d1ccbe7SJan Kara return -ESRCH; 20609d1ccbe7SJan Kara if (!dqopt->ops[qid->type]->get_next_id) 20619d1ccbe7SJan Kara return -ENOSYS; 2062f14618c6SJan Kara return dqopt->ops[qid->type]->get_next_id(sb, qid); 2063be6257b2SJan Kara } 2064be6257b2SJan Kara EXPORT_SYMBOL(dquot_get_next_id); 2065be6257b2SJan Kara 2066884d179dSJan Kara /* 2067884d179dSJan Kara * Definitions of diskquota operations. 2068884d179dSJan Kara */ 206961e225dcSAlexey Dobriyan const struct dquot_operations dquot_operations = { 2070884d179dSJan Kara .write_dquot = dquot_commit, 2071884d179dSJan Kara .acquire_dquot = dquot_acquire, 2072884d179dSJan Kara .release_dquot = dquot_release, 2073884d179dSJan Kara .mark_dirty = dquot_mark_dquot_dirty, 2074884d179dSJan Kara .write_info = dquot_commit_info, 2075884d179dSJan Kara .alloc_dquot = dquot_alloc, 2076884d179dSJan Kara .destroy_dquot = dquot_destroy, 2077be6257b2SJan Kara .get_next_id = dquot_get_next_id, 2078884d179dSJan Kara }; 2079123e9cafSChristoph Hellwig EXPORT_SYMBOL(dquot_operations); 2080884d179dSJan Kara 2081884d179dSJan Kara /* 2082907f4554SChristoph Hellwig * Generic helper for ->open on filesystems supporting disk quotas. 2083907f4554SChristoph Hellwig */ 2084907f4554SChristoph Hellwig int dquot_file_open(struct inode *inode, struct file *file) 2085907f4554SChristoph Hellwig { 2086907f4554SChristoph Hellwig int error; 2087907f4554SChristoph Hellwig 2088907f4554SChristoph Hellwig error = generic_file_open(inode, file); 2089907f4554SChristoph Hellwig if (!error && (file->f_mode & FMODE_WRITE)) 2090871a2931SChristoph Hellwig dquot_initialize(inode); 2091907f4554SChristoph Hellwig return error; 2092907f4554SChristoph Hellwig } 2093907f4554SChristoph Hellwig EXPORT_SYMBOL(dquot_file_open); 2094907f4554SChristoph Hellwig 2095907f4554SChristoph Hellwig /* 2096884d179dSJan Kara * Turn quota off on a device. type == -1 ==> quotaoff for all types (umount) 2097884d179dSJan Kara */ 20980f0dd62fSChristoph Hellwig int dquot_disable(struct super_block *sb, int type, unsigned int flags) 2099884d179dSJan Kara { 2100884d179dSJan Kara int cnt, ret = 0; 2101884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 2102884d179dSJan Kara struct inode *toputinode[MAXQUOTAS]; 2103884d179dSJan Kara 21047d6cd73dSJan Kara /* s_umount should be held in exclusive mode */ 21057d6cd73dSJan Kara if (WARN_ON_ONCE(down_read_trylock(&sb->s_umount))) 21067d6cd73dSJan Kara up_read(&sb->s_umount); 21077d6cd73dSJan Kara 2108884d179dSJan Kara /* Cannot turn off usage accounting without turning off limits, or 2109884d179dSJan Kara * suspend quotas and simultaneously turn quotas off. */ 2110884d179dSJan Kara if ((flags & DQUOT_USAGE_ENABLED && !(flags & DQUOT_LIMITS_ENABLED)) 2111884d179dSJan Kara || (flags & DQUOT_SUSPENDED && flags & (DQUOT_LIMITS_ENABLED | 2112884d179dSJan Kara DQUOT_USAGE_ENABLED))) 2113884d179dSJan Kara return -EINVAL; 2114884d179dSJan Kara 2115884d179dSJan Kara /* 2116884d179dSJan Kara * Skip everything if there's nothing to do. We have to do this because 2117884d179dSJan Kara * sometimes we are called when fill_super() failed and calling 2118884d179dSJan Kara * sync_fs() in such cases does no good. 2119884d179dSJan Kara */ 2120c3b00446SJan Kara if (!sb_any_quota_loaded(sb)) 2121884d179dSJan Kara return 0; 2122c3b00446SJan Kara 2123884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 2124884d179dSJan Kara toputinode[cnt] = NULL; 2125884d179dSJan Kara if (type != -1 && cnt != type) 2126884d179dSJan Kara continue; 2127884d179dSJan Kara if (!sb_has_quota_loaded(sb, cnt)) 2128884d179dSJan Kara continue; 2129884d179dSJan Kara 2130884d179dSJan Kara if (flags & DQUOT_SUSPENDED) { 2131884d179dSJan Kara spin_lock(&dq_state_lock); 2132884d179dSJan Kara dqopt->flags |= 2133884d179dSJan Kara dquot_state_flag(DQUOT_SUSPENDED, cnt); 2134884d179dSJan Kara spin_unlock(&dq_state_lock); 2135884d179dSJan Kara } else { 2136884d179dSJan Kara spin_lock(&dq_state_lock); 2137884d179dSJan Kara dqopt->flags &= ~dquot_state_flag(flags, cnt); 2138884d179dSJan Kara /* Turning off suspended quotas? */ 2139884d179dSJan Kara if (!sb_has_quota_loaded(sb, cnt) && 2140884d179dSJan Kara sb_has_quota_suspended(sb, cnt)) { 2141884d179dSJan Kara dqopt->flags &= ~dquot_state_flag( 2142884d179dSJan Kara DQUOT_SUSPENDED, cnt); 2143884d179dSJan Kara spin_unlock(&dq_state_lock); 2144884d179dSJan Kara iput(dqopt->files[cnt]); 2145884d179dSJan Kara dqopt->files[cnt] = NULL; 2146884d179dSJan Kara continue; 2147884d179dSJan Kara } 2148884d179dSJan Kara spin_unlock(&dq_state_lock); 2149884d179dSJan Kara } 2150884d179dSJan Kara 2151884d179dSJan Kara /* We still have to keep quota loaded? */ 2152884d179dSJan Kara if (sb_has_quota_loaded(sb, cnt) && !(flags & DQUOT_SUSPENDED)) 2153884d179dSJan Kara continue; 2154884d179dSJan Kara 2155884d179dSJan Kara /* Note: these are blocking operations */ 2156884d179dSJan Kara drop_dquot_ref(sb, cnt); 2157884d179dSJan Kara invalidate_dquots(sb, cnt); 2158884d179dSJan Kara /* 2159268157baSJan Kara * Now all dquots should be invalidated, all writes done so we 2160268157baSJan Kara * should be only users of the info. No locks needed. 2161884d179dSJan Kara */ 2162884d179dSJan Kara if (info_dirty(&dqopt->info[cnt])) 2163884d179dSJan Kara sb->dq_op->write_info(sb, cnt); 2164884d179dSJan Kara if (dqopt->ops[cnt]->free_file_info) 2165884d179dSJan Kara dqopt->ops[cnt]->free_file_info(sb, cnt); 2166884d179dSJan Kara put_quota_format(dqopt->info[cnt].dqi_format); 2167884d179dSJan Kara 2168884d179dSJan Kara toputinode[cnt] = dqopt->files[cnt]; 2169884d179dSJan Kara if (!sb_has_quota_loaded(sb, cnt)) 2170884d179dSJan Kara dqopt->files[cnt] = NULL; 2171884d179dSJan Kara dqopt->info[cnt].dqi_flags = 0; 2172884d179dSJan Kara dqopt->info[cnt].dqi_igrace = 0; 2173884d179dSJan Kara dqopt->info[cnt].dqi_bgrace = 0; 2174884d179dSJan Kara dqopt->ops[cnt] = NULL; 2175884d179dSJan Kara } 2176884d179dSJan Kara 2177884d179dSJan Kara /* Skip syncing and setting flags if quota files are hidden */ 2178884d179dSJan Kara if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) 2179884d179dSJan Kara goto put_inodes; 2180884d179dSJan Kara 2181884d179dSJan Kara /* Sync the superblock so that buffers with quota data are written to 2182884d179dSJan Kara * disk (and so userspace sees correct data afterwards). */ 2183884d179dSJan Kara if (sb->s_op->sync_fs) 2184884d179dSJan Kara sb->s_op->sync_fs(sb, 1); 2185884d179dSJan Kara sync_blockdev(sb->s_bdev); 2186884d179dSJan Kara /* Now the quota files are just ordinary files and we can set the 2187884d179dSJan Kara * inode flags back. Moreover we discard the pagecache so that 2188884d179dSJan Kara * userspace sees the writes we did bypassing the pagecache. We 2189884d179dSJan Kara * must also discard the blockdev buffers so that we see the 2190884d179dSJan Kara * changes done by userspace on the next quotaon() */ 2191884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 21922700e606SJan Kara /* This can happen when suspending quotas on remount-ro... */ 21932700e606SJan Kara if (toputinode[cnt] && !sb_has_quota_loaded(sb, cnt)) { 21945955102cSAl Viro inode_lock(toputinode[cnt]); 2195aad6cde9SJan Kara toputinode[cnt]->i_flags &= ~S_NOQUOTA; 2196c3b00446SJan Kara truncate_inode_pages(&toputinode[cnt]->i_data, 0); 21975955102cSAl Viro inode_unlock(toputinode[cnt]); 219843d2932dSJan Kara mark_inode_dirty_sync(toputinode[cnt]); 2199884d179dSJan Kara } 2200884d179dSJan Kara if (sb->s_bdev) 2201884d179dSJan Kara invalidate_bdev(sb->s_bdev); 2202884d179dSJan Kara put_inodes: 2203884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 2204884d179dSJan Kara if (toputinode[cnt]) { 2205884d179dSJan Kara /* On remount RO, we keep the inode pointer so that we 2206884d179dSJan Kara * can reenable quota on the subsequent remount RW. We 2207884d179dSJan Kara * have to check 'flags' variable and not use sb_has_ 2208884d179dSJan Kara * function because another quotaon / quotaoff could 2209884d179dSJan Kara * change global state before we got here. We refuse 2210884d179dSJan Kara * to suspend quotas when there is pending delete on 2211884d179dSJan Kara * the quota file... */ 2212884d179dSJan Kara if (!(flags & DQUOT_SUSPENDED)) 2213884d179dSJan Kara iput(toputinode[cnt]); 2214884d179dSJan Kara else if (!toputinode[cnt]->i_nlink) 2215884d179dSJan Kara ret = -EBUSY; 2216884d179dSJan Kara } 2217884d179dSJan Kara return ret; 2218884d179dSJan Kara } 22190f0dd62fSChristoph Hellwig EXPORT_SYMBOL(dquot_disable); 2220884d179dSJan Kara 2221287a8095SChristoph Hellwig int dquot_quota_off(struct super_block *sb, int type) 2222884d179dSJan Kara { 22230f0dd62fSChristoph Hellwig return dquot_disable(sb, type, 22240f0dd62fSChristoph Hellwig DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); 2225884d179dSJan Kara } 2226287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_quota_off); 22270f0dd62fSChristoph Hellwig 2228884d179dSJan Kara /* 2229884d179dSJan Kara * Turn quotas on on a device 2230884d179dSJan Kara */ 2231884d179dSJan Kara 2232884d179dSJan Kara /* 2233884d179dSJan Kara * Helper function to turn quotas on when we already have the inode of 2234884d179dSJan Kara * quota file and no quota information is loaded. 2235884d179dSJan Kara */ 2236884d179dSJan Kara static int vfs_load_quota_inode(struct inode *inode, int type, int format_id, 2237884d179dSJan Kara unsigned int flags) 2238884d179dSJan Kara { 2239884d179dSJan Kara struct quota_format_type *fmt = find_quota_format(format_id); 2240884d179dSJan Kara struct super_block *sb = inode->i_sb; 2241884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 2242884d179dSJan Kara int error; 2243884d179dSJan Kara 2244884d179dSJan Kara if (!fmt) 2245884d179dSJan Kara return -ESRCH; 2246884d179dSJan Kara if (!S_ISREG(inode->i_mode)) { 2247884d179dSJan Kara error = -EACCES; 2248884d179dSJan Kara goto out_fmt; 2249884d179dSJan Kara } 2250884d179dSJan Kara if (IS_RDONLY(inode)) { 2251884d179dSJan Kara error = -EROFS; 2252884d179dSJan Kara goto out_fmt; 2253884d179dSJan Kara } 2254847aac64SLi Xi if (!sb->s_op->quota_write || !sb->s_op->quota_read || 2255847aac64SLi Xi (type == PRJQUOTA && sb->dq_op->get_projid == NULL)) { 2256884d179dSJan Kara error = -EINVAL; 2257884d179dSJan Kara goto out_fmt; 2258884d179dSJan Kara } 22595c004828SEric W. Biederman /* Filesystems outside of init_user_ns not yet supported */ 22605c004828SEric W. Biederman if (sb->s_user_ns != &init_user_ns) { 22615c004828SEric W. Biederman error = -EINVAL; 22625c004828SEric W. Biederman goto out_fmt; 22635c004828SEric W. Biederman } 2264884d179dSJan Kara /* Usage always has to be set... */ 2265884d179dSJan Kara if (!(flags & DQUOT_USAGE_ENABLED)) { 2266884d179dSJan Kara error = -EINVAL; 2267884d179dSJan Kara goto out_fmt; 2268884d179dSJan Kara } 2269c3b00446SJan Kara if (sb_has_quota_loaded(sb, type)) { 2270c3b00446SJan Kara error = -EBUSY; 2271c3b00446SJan Kara goto out_fmt; 2272c3b00446SJan Kara } 2273884d179dSJan Kara 2274884d179dSJan Kara if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) { 2275ab94c39bSJan Kara /* As we bypass the pagecache we must now flush all the 2276ab94c39bSJan Kara * dirty data and invalidate caches so that kernel sees 2277ab94c39bSJan Kara * changes from userspace. It is not enough to just flush 2278ab94c39bSJan Kara * the quota file since if blocksize < pagesize, invalidation 2279ab94c39bSJan Kara * of the cache could fail because of other unrelated dirty 2280ab94c39bSJan Kara * data */ 2281ab94c39bSJan Kara sync_filesystem(sb); 2282884d179dSJan Kara invalidate_bdev(sb->s_bdev); 2283884d179dSJan Kara } 2284884d179dSJan Kara 2285884d179dSJan Kara if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) { 2286884d179dSJan Kara /* We don't want quota and atime on quota files (deadlocks 2287884d179dSJan Kara * possible) Also nobody should write to the file - we use 2288884d179dSJan Kara * special IO operations which ignore the immutable bit. */ 22895955102cSAl Viro inode_lock(inode); 2290aad6cde9SJan Kara inode->i_flags |= S_NOQUOTA; 22915955102cSAl Viro inode_unlock(inode); 229226245c94SJan Kara /* 229326245c94SJan Kara * When S_NOQUOTA is set, remove dquot references as no more 229426245c94SJan Kara * references can be added 229526245c94SJan Kara */ 22969f754758SChristoph Hellwig __dquot_drop(inode); 2297884d179dSJan Kara } 2298884d179dSJan Kara 2299884d179dSJan Kara error = -EIO; 2300884d179dSJan Kara dqopt->files[type] = igrab(inode); 2301884d179dSJan Kara if (!dqopt->files[type]) 2302c3b00446SJan Kara goto out_file_flags; 2303884d179dSJan Kara error = -EINVAL; 2304884d179dSJan Kara if (!fmt->qf_ops->check_quota_file(sb, type)) 2305884d179dSJan Kara goto out_file_init; 2306884d179dSJan Kara 2307884d179dSJan Kara dqopt->ops[type] = fmt->qf_ops; 2308884d179dSJan Kara dqopt->info[type].dqi_format = fmt; 2309884d179dSJan Kara dqopt->info[type].dqi_fmt_id = format_id; 2310884d179dSJan Kara INIT_LIST_HEAD(&dqopt->info[type].dqi_dirty_list); 2311268157baSJan Kara error = dqopt->ops[type]->read_file_info(sb, type); 231242fdb858SJan Kara if (error < 0) 2313884d179dSJan Kara goto out_file_init; 231415512377SJan Kara if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) { 231515512377SJan Kara spin_lock(&dq_data_lock); 231646fe44ceSJan Kara dqopt->info[type].dqi_flags |= DQF_SYS_FILE; 231715512377SJan Kara spin_unlock(&dq_data_lock); 231815512377SJan Kara } 2319884d179dSJan Kara spin_lock(&dq_state_lock); 2320884d179dSJan Kara dqopt->flags |= dquot_state_flag(flags, type); 2321884d179dSJan Kara spin_unlock(&dq_state_lock); 2322884d179dSJan Kara 2323884d179dSJan Kara add_dquot_ref(sb, type); 2324884d179dSJan Kara 2325884d179dSJan Kara return 0; 2326884d179dSJan Kara 2327884d179dSJan Kara out_file_init: 2328884d179dSJan Kara dqopt->files[type] = NULL; 2329884d179dSJan Kara iput(inode); 2330c3b00446SJan Kara out_file_flags: 23315955102cSAl Viro inode_lock(inode); 2332aad6cde9SJan Kara inode->i_flags &= ~S_NOQUOTA; 23335955102cSAl Viro inode_unlock(inode); 2334884d179dSJan Kara out_fmt: 2335884d179dSJan Kara put_quota_format(fmt); 2336884d179dSJan Kara 2337884d179dSJan Kara return error; 2338884d179dSJan Kara } 2339884d179dSJan Kara 2340884d179dSJan Kara /* Reenable quotas on remount RW */ 23410f0dd62fSChristoph Hellwig int dquot_resume(struct super_block *sb, int type) 2342884d179dSJan Kara { 2343884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 2344884d179dSJan Kara struct inode *inode; 23450f0dd62fSChristoph Hellwig int ret = 0, cnt; 2346884d179dSJan Kara unsigned int flags; 2347884d179dSJan Kara 23487d6cd73dSJan Kara /* s_umount should be held in exclusive mode */ 23497d6cd73dSJan Kara if (WARN_ON_ONCE(down_read_trylock(&sb->s_umount))) 23507d6cd73dSJan Kara up_read(&sb->s_umount); 23517d6cd73dSJan Kara 23520f0dd62fSChristoph Hellwig for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 23530f0dd62fSChristoph Hellwig if (type != -1 && cnt != type) 23540f0dd62fSChristoph Hellwig continue; 2355c3b00446SJan Kara if (!sb_has_quota_suspended(sb, cnt)) 23560f0dd62fSChristoph Hellwig continue; 2357c3b00446SJan Kara 23580f0dd62fSChristoph Hellwig inode = dqopt->files[cnt]; 23590f0dd62fSChristoph Hellwig dqopt->files[cnt] = NULL; 2360884d179dSJan Kara spin_lock(&dq_state_lock); 2361884d179dSJan Kara flags = dqopt->flags & dquot_state_flag(DQUOT_USAGE_ENABLED | 23620f0dd62fSChristoph Hellwig DQUOT_LIMITS_ENABLED, 23630f0dd62fSChristoph Hellwig cnt); 23640f0dd62fSChristoph Hellwig dqopt->flags &= ~dquot_state_flag(DQUOT_STATE_FLAGS, cnt); 2365884d179dSJan Kara spin_unlock(&dq_state_lock); 2366884d179dSJan Kara 23670f0dd62fSChristoph Hellwig flags = dquot_generic_flag(flags, cnt); 23680f0dd62fSChristoph Hellwig ret = vfs_load_quota_inode(inode, cnt, 23690f0dd62fSChristoph Hellwig dqopt->info[cnt].dqi_fmt_id, flags); 2370884d179dSJan Kara iput(inode); 23710f0dd62fSChristoph Hellwig } 2372884d179dSJan Kara 2373884d179dSJan Kara return ret; 2374884d179dSJan Kara } 23750f0dd62fSChristoph Hellwig EXPORT_SYMBOL(dquot_resume); 2376884d179dSJan Kara 2377f00c9e44SJan Kara int dquot_quota_on(struct super_block *sb, int type, int format_id, 23788c54ca9cSAl Viro const struct path *path) 2379884d179dSJan Kara { 2380884d179dSJan Kara int error = security_quota_on(path->dentry); 2381884d179dSJan Kara if (error) 2382884d179dSJan Kara return error; 2383884d179dSJan Kara /* Quota file not on the same filesystem? */ 2384d8c9584eSAl Viro if (path->dentry->d_sb != sb) 2385884d179dSJan Kara error = -EXDEV; 2386884d179dSJan Kara else 2387dea655c2SDavid Howells error = vfs_load_quota_inode(d_inode(path->dentry), type, 2388884d179dSJan Kara format_id, DQUOT_USAGE_ENABLED | 2389884d179dSJan Kara DQUOT_LIMITS_ENABLED); 2390884d179dSJan Kara return error; 2391884d179dSJan Kara } 2392287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_quota_on); 2393884d179dSJan Kara 2394884d179dSJan Kara /* 2395884d179dSJan Kara * More powerful function for turning on quotas allowing setting 2396884d179dSJan Kara * of individual quota flags 2397884d179dSJan Kara */ 2398287a8095SChristoph Hellwig int dquot_enable(struct inode *inode, int type, int format_id, 2399884d179dSJan Kara unsigned int flags) 2400884d179dSJan Kara { 2401884d179dSJan Kara struct super_block *sb = inode->i_sb; 2402884d179dSJan Kara 2403884d179dSJan Kara /* Just unsuspend quotas? */ 24040f0dd62fSChristoph Hellwig BUG_ON(flags & DQUOT_SUSPENDED); 24057d6cd73dSJan Kara /* s_umount should be held in exclusive mode */ 24067d6cd73dSJan Kara if (WARN_ON_ONCE(down_read_trylock(&sb->s_umount))) 24077d6cd73dSJan Kara up_read(&sb->s_umount); 24080f0dd62fSChristoph Hellwig 2409884d179dSJan Kara if (!flags) 2410884d179dSJan Kara return 0; 2411884d179dSJan Kara /* Just updating flags needed? */ 2412884d179dSJan Kara if (sb_has_quota_loaded(sb, type)) { 2413884d179dSJan Kara if (flags & DQUOT_USAGE_ENABLED && 2414c3b00446SJan Kara sb_has_quota_usage_enabled(sb, type)) 2415c3b00446SJan Kara return -EBUSY; 2416884d179dSJan Kara if (flags & DQUOT_LIMITS_ENABLED && 2417c3b00446SJan Kara sb_has_quota_limits_enabled(sb, type)) 2418c3b00446SJan Kara return -EBUSY; 2419884d179dSJan Kara spin_lock(&dq_state_lock); 2420884d179dSJan Kara sb_dqopt(sb)->flags |= dquot_state_flag(flags, type); 2421884d179dSJan Kara spin_unlock(&dq_state_lock); 2422c3b00446SJan Kara return 0; 2423884d179dSJan Kara } 2424884d179dSJan Kara 2425884d179dSJan Kara return vfs_load_quota_inode(inode, type, format_id, flags); 2426884d179dSJan Kara } 2427287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_enable); 2428884d179dSJan Kara 2429884d179dSJan Kara /* 2430884d179dSJan Kara * This function is used when filesystem needs to initialize quotas 2431884d179dSJan Kara * during mount time. 2432884d179dSJan Kara */ 2433287a8095SChristoph Hellwig int dquot_quota_on_mount(struct super_block *sb, char *qf_name, 2434884d179dSJan Kara int format_id, int type) 2435884d179dSJan Kara { 2436884d179dSJan Kara struct dentry *dentry; 2437884d179dSJan Kara int error; 2438884d179dSJan Kara 2439e12a4e8aSAl Viro dentry = lookup_one_len_unlocked(qf_name, sb->s_root, strlen(qf_name)); 2440884d179dSJan Kara if (IS_ERR(dentry)) 2441884d179dSJan Kara return PTR_ERR(dentry); 2442884d179dSJan Kara 2443dea655c2SDavid Howells if (d_really_is_negative(dentry)) { 2444884d179dSJan Kara error = -ENOENT; 2445884d179dSJan Kara goto out; 2446884d179dSJan Kara } 2447884d179dSJan Kara 2448884d179dSJan Kara error = security_quota_on(dentry); 2449884d179dSJan Kara if (!error) 2450dea655c2SDavid Howells error = vfs_load_quota_inode(d_inode(dentry), type, format_id, 2451884d179dSJan Kara DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); 2452884d179dSJan Kara 2453884d179dSJan Kara out: 2454884d179dSJan Kara dput(dentry); 2455884d179dSJan Kara return error; 2456884d179dSJan Kara } 2457287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_quota_on_mount); 2458884d179dSJan Kara 24593e2af67eSJan Kara static int dquot_quota_enable(struct super_block *sb, unsigned int flags) 24603e2af67eSJan Kara { 24613e2af67eSJan Kara int ret; 24623e2af67eSJan Kara int type; 24633e2af67eSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 24643e2af67eSJan Kara 24653e2af67eSJan Kara if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) 24663e2af67eSJan Kara return -ENOSYS; 24673e2af67eSJan Kara /* Accounting cannot be turned on while fs is mounted */ 24683e2af67eSJan Kara flags &= ~(FS_QUOTA_UDQ_ACCT | FS_QUOTA_GDQ_ACCT | FS_QUOTA_PDQ_ACCT); 24693e2af67eSJan Kara if (!flags) 24703e2af67eSJan Kara return -EINVAL; 24713e2af67eSJan Kara for (type = 0; type < MAXQUOTAS; type++) { 24723e2af67eSJan Kara if (!(flags & qtype_enforce_flag(type))) 24733e2af67eSJan Kara continue; 24743e2af67eSJan Kara /* Can't enforce without accounting */ 24753e2af67eSJan Kara if (!sb_has_quota_usage_enabled(sb, type)) 24763e2af67eSJan Kara return -EINVAL; 24773e2af67eSJan Kara ret = dquot_enable(dqopt->files[type], type, 24783e2af67eSJan Kara dqopt->info[type].dqi_fmt_id, 24793e2af67eSJan Kara DQUOT_LIMITS_ENABLED); 24803e2af67eSJan Kara if (ret < 0) 24813e2af67eSJan Kara goto out_err; 24823e2af67eSJan Kara } 24833e2af67eSJan Kara return 0; 24843e2af67eSJan Kara out_err: 24853e2af67eSJan Kara /* Backout enforcement enablement we already did */ 24863e2af67eSJan Kara for (type--; type >= 0; type--) { 24873e2af67eSJan Kara if (flags & qtype_enforce_flag(type)) 24883e2af67eSJan Kara dquot_disable(sb, type, DQUOT_LIMITS_ENABLED); 24893e2af67eSJan Kara } 24903e2af67eSJan Kara /* Error code translation for better compatibility with XFS */ 24913e2af67eSJan Kara if (ret == -EBUSY) 24923e2af67eSJan Kara ret = -EEXIST; 24933e2af67eSJan Kara return ret; 24943e2af67eSJan Kara } 24953e2af67eSJan Kara 24963e2af67eSJan Kara static int dquot_quota_disable(struct super_block *sb, unsigned int flags) 24973e2af67eSJan Kara { 24983e2af67eSJan Kara int ret; 24993e2af67eSJan Kara int type; 25003e2af67eSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 25013e2af67eSJan Kara 25023e2af67eSJan Kara if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) 25033e2af67eSJan Kara return -ENOSYS; 25043e2af67eSJan Kara /* 25053e2af67eSJan Kara * We don't support turning off accounting via quotactl. In principle 25063e2af67eSJan Kara * quota infrastructure can do this but filesystems don't expect 25073e2af67eSJan Kara * userspace to be able to do it. 25083e2af67eSJan Kara */ 25093e2af67eSJan Kara if (flags & 25103e2af67eSJan Kara (FS_QUOTA_UDQ_ACCT | FS_QUOTA_GDQ_ACCT | FS_QUOTA_PDQ_ACCT)) 25113e2af67eSJan Kara return -EOPNOTSUPP; 25123e2af67eSJan Kara 25133e2af67eSJan Kara /* Filter out limits not enabled */ 25143e2af67eSJan Kara for (type = 0; type < MAXQUOTAS; type++) 25153e2af67eSJan Kara if (!sb_has_quota_limits_enabled(sb, type)) 25163e2af67eSJan Kara flags &= ~qtype_enforce_flag(type); 25173e2af67eSJan Kara /* Nothing left? */ 25183e2af67eSJan Kara if (!flags) 25193e2af67eSJan Kara return -EEXIST; 25203e2af67eSJan Kara for (type = 0; type < MAXQUOTAS; type++) { 25213e2af67eSJan Kara if (flags & qtype_enforce_flag(type)) { 25223e2af67eSJan Kara ret = dquot_disable(sb, type, DQUOT_LIMITS_ENABLED); 25233e2af67eSJan Kara if (ret < 0) 25243e2af67eSJan Kara goto out_err; 25253e2af67eSJan Kara } 25263e2af67eSJan Kara } 25273e2af67eSJan Kara return 0; 25283e2af67eSJan Kara out_err: 25293e2af67eSJan Kara /* Backout enforcement disabling we already did */ 25303e2af67eSJan Kara for (type--; type >= 0; type--) { 25313e2af67eSJan Kara if (flags & qtype_enforce_flag(type)) 25323e2af67eSJan Kara dquot_enable(dqopt->files[type], type, 25333e2af67eSJan Kara dqopt->info[type].dqi_fmt_id, 25343e2af67eSJan Kara DQUOT_LIMITS_ENABLED); 25353e2af67eSJan Kara } 25363e2af67eSJan Kara return ret; 25373e2af67eSJan Kara } 25383e2af67eSJan Kara 2539884d179dSJan Kara /* Generic routine for getting common part of quota structure */ 254014bf61ffSJan Kara static void do_get_dqblk(struct dquot *dquot, struct qc_dqblk *di) 2541884d179dSJan Kara { 2542884d179dSJan Kara struct mem_dqblk *dm = &dquot->dq_dqb; 2543884d179dSJan Kara 2544b9b2dd36SChristoph Hellwig memset(di, 0, sizeof(*di)); 2545884d179dSJan Kara spin_lock(&dq_data_lock); 254614bf61ffSJan Kara di->d_spc_hardlimit = dm->dqb_bhardlimit; 254714bf61ffSJan Kara di->d_spc_softlimit = dm->dqb_bsoftlimit; 2548b9b2dd36SChristoph Hellwig di->d_ino_hardlimit = dm->dqb_ihardlimit; 2549b9b2dd36SChristoph Hellwig di->d_ino_softlimit = dm->dqb_isoftlimit; 255014bf61ffSJan Kara di->d_space = dm->dqb_curspace + dm->dqb_rsvspace; 255114bf61ffSJan Kara di->d_ino_count = dm->dqb_curinodes; 255214bf61ffSJan Kara di->d_spc_timer = dm->dqb_btime; 255314bf61ffSJan Kara di->d_ino_timer = dm->dqb_itime; 2554884d179dSJan Kara spin_unlock(&dq_data_lock); 2555884d179dSJan Kara } 2556884d179dSJan Kara 255774a8a103SEric W. Biederman int dquot_get_dqblk(struct super_block *sb, struct kqid qid, 255814bf61ffSJan Kara struct qc_dqblk *di) 2559884d179dSJan Kara { 2560884d179dSJan Kara struct dquot *dquot; 2561884d179dSJan Kara 2562aca645a6SEric W. Biederman dquot = dqget(sb, qid); 25636184fc0bSJan Kara if (IS_ERR(dquot)) 25646184fc0bSJan Kara return PTR_ERR(dquot); 2565884d179dSJan Kara do_get_dqblk(dquot, di); 2566884d179dSJan Kara dqput(dquot); 2567884d179dSJan Kara 2568884d179dSJan Kara return 0; 2569884d179dSJan Kara } 2570287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_get_dqblk); 2571884d179dSJan Kara 2572be6257b2SJan Kara int dquot_get_next_dqblk(struct super_block *sb, struct kqid *qid, 2573be6257b2SJan Kara struct qc_dqblk *di) 2574be6257b2SJan Kara { 2575be6257b2SJan Kara struct dquot *dquot; 2576be6257b2SJan Kara int err; 2577be6257b2SJan Kara 2578be6257b2SJan Kara if (!sb->dq_op->get_next_id) 2579be6257b2SJan Kara return -ENOSYS; 2580be6257b2SJan Kara err = sb->dq_op->get_next_id(sb, qid); 2581be6257b2SJan Kara if (err < 0) 2582be6257b2SJan Kara return err; 2583be6257b2SJan Kara dquot = dqget(sb, *qid); 2584be6257b2SJan Kara if (IS_ERR(dquot)) 2585be6257b2SJan Kara return PTR_ERR(dquot); 2586be6257b2SJan Kara do_get_dqblk(dquot, di); 2587be6257b2SJan Kara dqput(dquot); 2588be6257b2SJan Kara 2589be6257b2SJan Kara return 0; 2590be6257b2SJan Kara } 2591be6257b2SJan Kara EXPORT_SYMBOL(dquot_get_next_dqblk); 2592be6257b2SJan Kara 259314bf61ffSJan Kara #define VFS_QC_MASK \ 259414bf61ffSJan Kara (QC_SPACE | QC_SPC_SOFT | QC_SPC_HARD | \ 259514bf61ffSJan Kara QC_INO_COUNT | QC_INO_SOFT | QC_INO_HARD | \ 259614bf61ffSJan Kara QC_SPC_TIMER | QC_INO_TIMER) 2597c472b432SChristoph Hellwig 2598884d179dSJan Kara /* Generic routine for setting common part of quota structure */ 259914bf61ffSJan Kara static int do_set_dqblk(struct dquot *dquot, struct qc_dqblk *di) 2600884d179dSJan Kara { 2601884d179dSJan Kara struct mem_dqblk *dm = &dquot->dq_dqb; 2602884d179dSJan Kara int check_blim = 0, check_ilim = 0; 26034c376dcaSEric W. Biederman struct mem_dqinfo *dqi = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_id.type]; 2604884d179dSJan Kara 260514bf61ffSJan Kara if (di->d_fieldmask & ~VFS_QC_MASK) 2606c472b432SChristoph Hellwig return -EINVAL; 2607c472b432SChristoph Hellwig 260814bf61ffSJan Kara if (((di->d_fieldmask & QC_SPC_SOFT) && 2609b10a0819SJan Kara di->d_spc_softlimit > dqi->dqi_max_spc_limit) || 261014bf61ffSJan Kara ((di->d_fieldmask & QC_SPC_HARD) && 2611b10a0819SJan Kara di->d_spc_hardlimit > dqi->dqi_max_spc_limit) || 261214bf61ffSJan Kara ((di->d_fieldmask & QC_INO_SOFT) && 2613b10a0819SJan Kara (di->d_ino_softlimit > dqi->dqi_max_ino_limit)) || 261414bf61ffSJan Kara ((di->d_fieldmask & QC_INO_HARD) && 2615b10a0819SJan Kara (di->d_ino_hardlimit > dqi->dqi_max_ino_limit))) 2616884d179dSJan Kara return -ERANGE; 2617884d179dSJan Kara 2618884d179dSJan Kara spin_lock(&dq_data_lock); 261914bf61ffSJan Kara if (di->d_fieldmask & QC_SPACE) { 262014bf61ffSJan Kara dm->dqb_curspace = di->d_space - dm->dqb_rsvspace; 2621884d179dSJan Kara check_blim = 1; 262208261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags); 2623884d179dSJan Kara } 2624c472b432SChristoph Hellwig 262514bf61ffSJan Kara if (di->d_fieldmask & QC_SPC_SOFT) 262614bf61ffSJan Kara dm->dqb_bsoftlimit = di->d_spc_softlimit; 262714bf61ffSJan Kara if (di->d_fieldmask & QC_SPC_HARD) 262814bf61ffSJan Kara dm->dqb_bhardlimit = di->d_spc_hardlimit; 262914bf61ffSJan Kara if (di->d_fieldmask & (QC_SPC_SOFT | QC_SPC_HARD)) { 2630884d179dSJan Kara check_blim = 1; 263108261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags); 2632884d179dSJan Kara } 2633c472b432SChristoph Hellwig 263414bf61ffSJan Kara if (di->d_fieldmask & QC_INO_COUNT) { 263514bf61ffSJan Kara dm->dqb_curinodes = di->d_ino_count; 2636884d179dSJan Kara check_ilim = 1; 263708261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags); 2638884d179dSJan Kara } 2639c472b432SChristoph Hellwig 264014bf61ffSJan Kara if (di->d_fieldmask & QC_INO_SOFT) 2641c472b432SChristoph Hellwig dm->dqb_isoftlimit = di->d_ino_softlimit; 264214bf61ffSJan Kara if (di->d_fieldmask & QC_INO_HARD) 2643c472b432SChristoph Hellwig dm->dqb_ihardlimit = di->d_ino_hardlimit; 264414bf61ffSJan Kara if (di->d_fieldmask & (QC_INO_SOFT | QC_INO_HARD)) { 2645884d179dSJan Kara check_ilim = 1; 264608261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags); 2647884d179dSJan Kara } 2648c472b432SChristoph Hellwig 264914bf61ffSJan Kara if (di->d_fieldmask & QC_SPC_TIMER) { 265014bf61ffSJan Kara dm->dqb_btime = di->d_spc_timer; 2651884d179dSJan Kara check_blim = 1; 265208261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags); 2653884d179dSJan Kara } 2654c472b432SChristoph Hellwig 265514bf61ffSJan Kara if (di->d_fieldmask & QC_INO_TIMER) { 265614bf61ffSJan Kara dm->dqb_itime = di->d_ino_timer; 2657884d179dSJan Kara check_ilim = 1; 265808261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags); 2659884d179dSJan Kara } 2660884d179dSJan Kara 2661884d179dSJan Kara if (check_blim) { 2662268157baSJan Kara if (!dm->dqb_bsoftlimit || 2663268157baSJan Kara dm->dqb_curspace < dm->dqb_bsoftlimit) { 2664884d179dSJan Kara dm->dqb_btime = 0; 2665884d179dSJan Kara clear_bit(DQ_BLKS_B, &dquot->dq_flags); 266614bf61ffSJan Kara } else if (!(di->d_fieldmask & QC_SPC_TIMER)) 2667268157baSJan Kara /* Set grace only if user hasn't provided his own... */ 2668e008bb61SArnd Bergmann dm->dqb_btime = ktime_get_real_seconds() + dqi->dqi_bgrace; 2669884d179dSJan Kara } 2670884d179dSJan Kara if (check_ilim) { 2671268157baSJan Kara if (!dm->dqb_isoftlimit || 2672268157baSJan Kara dm->dqb_curinodes < dm->dqb_isoftlimit) { 2673884d179dSJan Kara dm->dqb_itime = 0; 2674884d179dSJan Kara clear_bit(DQ_INODES_B, &dquot->dq_flags); 267514bf61ffSJan Kara } else if (!(di->d_fieldmask & QC_INO_TIMER)) 2676268157baSJan Kara /* Set grace only if user hasn't provided his own... */ 2677e008bb61SArnd Bergmann dm->dqb_itime = ktime_get_real_seconds() + dqi->dqi_igrace; 2678884d179dSJan Kara } 2679268157baSJan Kara if (dm->dqb_bhardlimit || dm->dqb_bsoftlimit || dm->dqb_ihardlimit || 2680268157baSJan Kara dm->dqb_isoftlimit) 2681884d179dSJan Kara clear_bit(DQ_FAKE_B, &dquot->dq_flags); 2682884d179dSJan Kara else 2683884d179dSJan Kara set_bit(DQ_FAKE_B, &dquot->dq_flags); 2684884d179dSJan Kara spin_unlock(&dq_data_lock); 2685884d179dSJan Kara mark_dquot_dirty(dquot); 2686884d179dSJan Kara 2687884d179dSJan Kara return 0; 2688884d179dSJan Kara } 2689884d179dSJan Kara 269074a8a103SEric W. Biederman int dquot_set_dqblk(struct super_block *sb, struct kqid qid, 269114bf61ffSJan Kara struct qc_dqblk *di) 2692884d179dSJan Kara { 2693884d179dSJan Kara struct dquot *dquot; 2694884d179dSJan Kara int rc; 2695884d179dSJan Kara 2696aca645a6SEric W. Biederman dquot = dqget(sb, qid); 26976184fc0bSJan Kara if (IS_ERR(dquot)) { 26986184fc0bSJan Kara rc = PTR_ERR(dquot); 2699884d179dSJan Kara goto out; 2700884d179dSJan Kara } 2701884d179dSJan Kara rc = do_set_dqblk(dquot, di); 2702884d179dSJan Kara dqput(dquot); 2703884d179dSJan Kara out: 2704884d179dSJan Kara return rc; 2705884d179dSJan Kara } 2706287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_set_dqblk); 2707884d179dSJan Kara 2708884d179dSJan Kara /* Generic routine for getting common part of quota file information */ 27090a240339SJan Kara int dquot_get_state(struct super_block *sb, struct qc_state *state) 2710884d179dSJan Kara { 2711884d179dSJan Kara struct mem_dqinfo *mi; 27120a240339SJan Kara struct qc_type_state *tstate; 27130a240339SJan Kara struct quota_info *dqopt = sb_dqopt(sb); 27140a240339SJan Kara int type; 2715884d179dSJan Kara 27160a240339SJan Kara memset(state, 0, sizeof(*state)); 27170a240339SJan Kara for (type = 0; type < MAXQUOTAS; type++) { 27180a240339SJan Kara if (!sb_has_quota_active(sb, type)) 27190a240339SJan Kara continue; 27200a240339SJan Kara tstate = state->s_state + type; 2721884d179dSJan Kara mi = sb_dqopt(sb)->info + type; 27220a240339SJan Kara tstate->flags = QCI_ACCT_ENABLED; 2723884d179dSJan Kara spin_lock(&dq_data_lock); 27240a240339SJan Kara if (mi->dqi_flags & DQF_SYS_FILE) 27250a240339SJan Kara tstate->flags |= QCI_SYSFILE; 27260a240339SJan Kara if (mi->dqi_flags & DQF_ROOT_SQUASH) 27270a240339SJan Kara tstate->flags |= QCI_ROOT_SQUASH; 27280a240339SJan Kara if (sb_has_quota_limits_enabled(sb, type)) 27290a240339SJan Kara tstate->flags |= QCI_LIMITS_ENFORCED; 27300a240339SJan Kara tstate->spc_timelimit = mi->dqi_bgrace; 27310a240339SJan Kara tstate->ino_timelimit = mi->dqi_igrace; 27320a240339SJan Kara tstate->ino = dqopt->files[type]->i_ino; 27330a240339SJan Kara tstate->blocks = dqopt->files[type]->i_blocks; 27340a240339SJan Kara tstate->nextents = 1; /* We don't know... */ 2735884d179dSJan Kara spin_unlock(&dq_data_lock); 27360a240339SJan Kara } 2737884d179dSJan Kara return 0; 2738884d179dSJan Kara } 27390a240339SJan Kara EXPORT_SYMBOL(dquot_get_state); 2740884d179dSJan Kara 2741884d179dSJan Kara /* Generic routine for setting common part of quota file information */ 27425eacb2acSJan Kara int dquot_set_dqinfo(struct super_block *sb, int type, struct qc_info *ii) 2743884d179dSJan Kara { 2744884d179dSJan Kara struct mem_dqinfo *mi; 2745884d179dSJan Kara int err = 0; 2746884d179dSJan Kara 27475eacb2acSJan Kara if ((ii->i_fieldmask & QC_WARNS_MASK) || 27485eacb2acSJan Kara (ii->i_fieldmask & QC_RT_SPC_TIMER)) 27495eacb2acSJan Kara return -EINVAL; 27509d1ccbe7SJan Kara if (!sb_has_quota_active(sb, type)) 27519d1ccbe7SJan Kara return -ESRCH; 2752884d179dSJan Kara mi = sb_dqopt(sb)->info + type; 27535eacb2acSJan Kara if (ii->i_fieldmask & QC_FLAGS) { 27545eacb2acSJan Kara if ((ii->i_flags & QCI_ROOT_SQUASH && 27559d1ccbe7SJan Kara mi->dqi_format->qf_fmt_id != QFMT_VFS_OLD)) 27569d1ccbe7SJan Kara return -EINVAL; 2757ca6cb091SJan Kara } 2758884d179dSJan Kara spin_lock(&dq_data_lock); 27595eacb2acSJan Kara if (ii->i_fieldmask & QC_SPC_TIMER) 27605eacb2acSJan Kara mi->dqi_bgrace = ii->i_spc_timelimit; 27615eacb2acSJan Kara if (ii->i_fieldmask & QC_INO_TIMER) 27625eacb2acSJan Kara mi->dqi_igrace = ii->i_ino_timelimit; 27635eacb2acSJan Kara if (ii->i_fieldmask & QC_FLAGS) { 27645eacb2acSJan Kara if (ii->i_flags & QCI_ROOT_SQUASH) 27655eacb2acSJan Kara mi->dqi_flags |= DQF_ROOT_SQUASH; 27665eacb2acSJan Kara else 27675eacb2acSJan Kara mi->dqi_flags &= ~DQF_ROOT_SQUASH; 27685eacb2acSJan Kara } 2769884d179dSJan Kara spin_unlock(&dq_data_lock); 2770884d179dSJan Kara mark_info_dirty(sb, type); 2771884d179dSJan Kara /* Force write to disk */ 2772884d179dSJan Kara sb->dq_op->write_info(sb, type); 2773884d179dSJan Kara return err; 2774884d179dSJan Kara } 2775287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_set_dqinfo); 2776884d179dSJan Kara 27773e2af67eSJan Kara const struct quotactl_ops dquot_quotactl_sysfile_ops = { 27783e2af67eSJan Kara .quota_enable = dquot_quota_enable, 27793e2af67eSJan Kara .quota_disable = dquot_quota_disable, 27803e2af67eSJan Kara .quota_sync = dquot_quota_sync, 27810a240339SJan Kara .get_state = dquot_get_state, 27823e2af67eSJan Kara .set_info = dquot_set_dqinfo, 27833e2af67eSJan Kara .get_dqblk = dquot_get_dqblk, 2784be6257b2SJan Kara .get_nextdqblk = dquot_get_next_dqblk, 27853e2af67eSJan Kara .set_dqblk = dquot_set_dqblk 27863e2af67eSJan Kara }; 27873e2af67eSJan Kara EXPORT_SYMBOL(dquot_quotactl_sysfile_ops); 27883e2af67eSJan Kara 2789dde95888SDmitry Monakhov static int do_proc_dqstats(struct ctl_table *table, int write, 2790dde95888SDmitry Monakhov void __user *buffer, size_t *lenp, loff_t *ppos) 2791dde95888SDmitry Monakhov { 2792dde95888SDmitry Monakhov unsigned int type = (int *)table->data - dqstats.stat; 2793f32764bdSDmitry Monakhov 2794f32764bdSDmitry Monakhov /* Update global table */ 2795f32764bdSDmitry Monakhov dqstats.stat[type] = 2796f32764bdSDmitry Monakhov percpu_counter_sum_positive(&dqstats.counter[type]); 2797dde95888SDmitry Monakhov return proc_dointvec(table, write, buffer, lenp, ppos); 2798dde95888SDmitry Monakhov } 2799dde95888SDmitry Monakhov 2800e628753bSJoe Perches static struct ctl_table fs_dqstats_table[] = { 2801884d179dSJan Kara { 2802884d179dSJan Kara .procname = "lookups", 2803dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_LOOKUPS], 2804884d179dSJan Kara .maxlen = sizeof(int), 2805884d179dSJan Kara .mode = 0444, 2806dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2807884d179dSJan Kara }, 2808884d179dSJan Kara { 2809884d179dSJan Kara .procname = "drops", 2810dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_DROPS], 2811884d179dSJan Kara .maxlen = sizeof(int), 2812884d179dSJan Kara .mode = 0444, 2813dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2814884d179dSJan Kara }, 2815884d179dSJan Kara { 2816884d179dSJan Kara .procname = "reads", 2817dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_READS], 2818884d179dSJan Kara .maxlen = sizeof(int), 2819884d179dSJan Kara .mode = 0444, 2820dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2821884d179dSJan Kara }, 2822884d179dSJan Kara { 2823884d179dSJan Kara .procname = "writes", 2824dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_WRITES], 2825884d179dSJan Kara .maxlen = sizeof(int), 2826884d179dSJan Kara .mode = 0444, 2827dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2828884d179dSJan Kara }, 2829884d179dSJan Kara { 2830884d179dSJan Kara .procname = "cache_hits", 2831dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_CACHE_HITS], 2832884d179dSJan Kara .maxlen = sizeof(int), 2833884d179dSJan Kara .mode = 0444, 2834dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2835884d179dSJan Kara }, 2836884d179dSJan Kara { 2837884d179dSJan Kara .procname = "allocated_dquots", 2838dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_ALLOC_DQUOTS], 2839884d179dSJan Kara .maxlen = sizeof(int), 2840884d179dSJan Kara .mode = 0444, 2841dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2842884d179dSJan Kara }, 2843884d179dSJan Kara { 2844884d179dSJan Kara .procname = "free_dquots", 2845dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_FREE_DQUOTS], 2846884d179dSJan Kara .maxlen = sizeof(int), 2847884d179dSJan Kara .mode = 0444, 2848dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2849884d179dSJan Kara }, 2850884d179dSJan Kara { 2851884d179dSJan Kara .procname = "syncs", 2852dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_SYNCS], 2853884d179dSJan Kara .maxlen = sizeof(int), 2854884d179dSJan Kara .mode = 0444, 2855dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2856884d179dSJan Kara }, 2857884d179dSJan Kara #ifdef CONFIG_PRINT_QUOTA_WARNING 2858884d179dSJan Kara { 2859884d179dSJan Kara .procname = "warnings", 2860884d179dSJan Kara .data = &flag_print_warnings, 2861884d179dSJan Kara .maxlen = sizeof(int), 2862884d179dSJan Kara .mode = 0644, 28636d456111SEric W. Biederman .proc_handler = proc_dointvec, 2864884d179dSJan Kara }, 2865884d179dSJan Kara #endif 2866ab09203eSEric W. Biederman { }, 2867884d179dSJan Kara }; 2868884d179dSJan Kara 2869e628753bSJoe Perches static struct ctl_table fs_table[] = { 2870884d179dSJan Kara { 2871884d179dSJan Kara .procname = "quota", 2872884d179dSJan Kara .mode = 0555, 2873884d179dSJan Kara .child = fs_dqstats_table, 2874884d179dSJan Kara }, 2875ab09203eSEric W. Biederman { }, 2876884d179dSJan Kara }; 2877884d179dSJan Kara 2878e628753bSJoe Perches static struct ctl_table sys_table[] = { 2879884d179dSJan Kara { 2880884d179dSJan Kara .procname = "fs", 2881884d179dSJan Kara .mode = 0555, 2882884d179dSJan Kara .child = fs_table, 2883884d179dSJan Kara }, 2884ab09203eSEric W. Biederman { }, 2885884d179dSJan Kara }; 2886884d179dSJan Kara 2887884d179dSJan Kara static int __init dquot_init(void) 2888884d179dSJan Kara { 2889f32764bdSDmitry Monakhov int i, ret; 2890884d179dSJan Kara unsigned long nr_hash, order; 2891884d179dSJan Kara 2892884d179dSJan Kara printk(KERN_NOTICE "VFS: Disk quotas %s\n", __DQUOT_VERSION__); 2893884d179dSJan Kara 2894884d179dSJan Kara register_sysctl_table(sys_table); 2895884d179dSJan Kara 2896884d179dSJan Kara dquot_cachep = kmem_cache_create("dquot", 2897884d179dSJan Kara sizeof(struct dquot), sizeof(unsigned long) * 4, 2898884d179dSJan Kara (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| 2899884d179dSJan Kara SLAB_MEM_SPREAD|SLAB_PANIC), 2900884d179dSJan Kara NULL); 2901884d179dSJan Kara 2902884d179dSJan Kara order = 0; 2903884d179dSJan Kara dquot_hash = (struct hlist_head *)__get_free_pages(GFP_ATOMIC, order); 2904884d179dSJan Kara if (!dquot_hash) 2905884d179dSJan Kara panic("Cannot create dquot hash table"); 2906884d179dSJan Kara 2907f32764bdSDmitry Monakhov for (i = 0; i < _DQST_DQSTAT_LAST; i++) { 2908908c7f19STejun Heo ret = percpu_counter_init(&dqstats.counter[i], 0, GFP_KERNEL); 2909f32764bdSDmitry Monakhov if (ret) 2910f32764bdSDmitry Monakhov panic("Cannot create dquot stat counters"); 2911f32764bdSDmitry Monakhov } 2912dde95888SDmitry Monakhov 2913884d179dSJan Kara /* Find power-of-two hlist_heads which can fit into allocation */ 2914884d179dSJan Kara nr_hash = (1UL << order) * PAGE_SIZE / sizeof(struct hlist_head); 2915884d179dSJan Kara dq_hash_bits = 0; 2916884d179dSJan Kara do { 2917884d179dSJan Kara dq_hash_bits++; 2918884d179dSJan Kara } while (nr_hash >> dq_hash_bits); 2919884d179dSJan Kara dq_hash_bits--; 2920884d179dSJan Kara 2921884d179dSJan Kara nr_hash = 1UL << dq_hash_bits; 2922884d179dSJan Kara dq_hash_mask = nr_hash - 1; 2923884d179dSJan Kara for (i = 0; i < nr_hash; i++) 2924884d179dSJan Kara INIT_HLIST_HEAD(dquot_hash + i); 2925884d179dSJan Kara 292619858e7bSAnton Blanchard pr_info("VFS: Dquot-cache hash table entries: %ld (order %ld," 292719858e7bSAnton Blanchard " %ld bytes)\n", nr_hash, order, (PAGE_SIZE << order)); 2928884d179dSJan Kara 2929884d179dSJan Kara register_shrinker(&dqcache_shrinker); 2930884d179dSJan Kara 2931884d179dSJan Kara return 0; 2932884d179dSJan Kara } 2933331221faSPaul Gortmaker fs_initcall(dquot_init); 2934