1884d179dSJan Kara /* 2884d179dSJan Kara * Implementation of the diskquota system for the LINUX operating system. QUOTA 3884d179dSJan Kara * is implemented using the BSD system call interface as the means of 4884d179dSJan Kara * communication with the user level. This file contains the generic routines 5884d179dSJan Kara * called by the different filesystems on allocation of an inode or block. 6884d179dSJan Kara * These routines take care of the administration needed to have a consistent 7884d179dSJan Kara * diskquota tracking system. The ideas of both user and group quotas are based 8884d179dSJan Kara * on the Melbourne quota system as used on BSD derived systems. The internal 9884d179dSJan Kara * implementation is based on one of the several variants of the LINUX 10884d179dSJan Kara * inode-subsystem with added complexity of the diskquota system. 11884d179dSJan Kara * 12884d179dSJan Kara * Author: Marco van Wieringen <mvw@planets.elm.net> 13884d179dSJan Kara * 14884d179dSJan Kara * Fixes: Dmitry Gorodchanin <pgmdsg@ibi.com>, 11 Feb 96 15884d179dSJan Kara * 16884d179dSJan Kara * Revised list management to avoid races 17884d179dSJan Kara * -- Bill Hawes, <whawes@star.net>, 9/98 18884d179dSJan Kara * 19884d179dSJan Kara * Fixed races in dquot_transfer(), dqget() and dquot_alloc_...(). 20884d179dSJan Kara * As the consequence the locking was moved from dquot_decr_...(), 21884d179dSJan Kara * dquot_incr_...() to calling functions. 22884d179dSJan Kara * invalidate_dquots() now writes modified dquots. 23884d179dSJan Kara * Serialized quota_off() and quota_on() for mount point. 24884d179dSJan Kara * Fixed a few bugs in grow_dquots(). 25884d179dSJan Kara * Fixed deadlock in write_dquot() - we no longer account quotas on 26884d179dSJan Kara * quota files 27884d179dSJan Kara * remove_dquot_ref() moved to inode.c - it now traverses through inodes 28884d179dSJan Kara * add_dquot_ref() restarts after blocking 29884d179dSJan Kara * Added check for bogus uid and fixed check for group in quotactl. 30884d179dSJan Kara * Jan Kara, <jack@suse.cz>, sponsored by SuSE CR, 10-11/99 31884d179dSJan Kara * 32884d179dSJan Kara * Used struct list_head instead of own list struct 33884d179dSJan Kara * Invalidation of referenced dquots is no longer possible 34884d179dSJan Kara * Improved free_dquots list management 35884d179dSJan Kara * Quota and i_blocks are now updated in one place to avoid races 36884d179dSJan Kara * Warnings are now delayed so we won't block in critical section 37884d179dSJan Kara * Write updated not to require dquot lock 38884d179dSJan Kara * Jan Kara, <jack@suse.cz>, 9/2000 39884d179dSJan Kara * 40884d179dSJan Kara * Added dynamic quota structure allocation 41884d179dSJan Kara * Jan Kara <jack@suse.cz> 12/2000 42884d179dSJan Kara * 43884d179dSJan Kara * Rewritten quota interface. Implemented new quota format and 44884d179dSJan Kara * formats registering. 45884d179dSJan Kara * Jan Kara, <jack@suse.cz>, 2001,2002 46884d179dSJan Kara * 47884d179dSJan Kara * New SMP locking. 48884d179dSJan Kara * Jan Kara, <jack@suse.cz>, 10/2002 49884d179dSJan Kara * 50884d179dSJan Kara * Added journalled quota support, fix lock inversion problems 51884d179dSJan Kara * Jan Kara, <jack@suse.cz>, 2003,2004 52884d179dSJan Kara * 53884d179dSJan Kara * (C) Copyright 1994 - 1997 Marco van Wieringen 54884d179dSJan Kara */ 55884d179dSJan Kara 56884d179dSJan Kara #include <linux/errno.h> 57884d179dSJan Kara #include <linux/kernel.h> 58884d179dSJan Kara #include <linux/fs.h> 59884d179dSJan Kara #include <linux/mount.h> 60884d179dSJan Kara #include <linux/mm.h> 61884d179dSJan Kara #include <linux/time.h> 62884d179dSJan Kara #include <linux/types.h> 63884d179dSJan Kara #include <linux/string.h> 64884d179dSJan Kara #include <linux/fcntl.h> 65884d179dSJan Kara #include <linux/stat.h> 66884d179dSJan Kara #include <linux/tty.h> 67884d179dSJan Kara #include <linux/file.h> 68884d179dSJan Kara #include <linux/slab.h> 69884d179dSJan Kara #include <linux/sysctl.h> 70884d179dSJan Kara #include <linux/init.h> 71884d179dSJan Kara #include <linux/module.h> 72884d179dSJan Kara #include <linux/proc_fs.h> 73884d179dSJan Kara #include <linux/security.h> 7440401530SAl Viro #include <linux/sched.h> 75884d179dSJan Kara #include <linux/kmod.h> 76884d179dSJan Kara #include <linux/namei.h> 77884d179dSJan Kara #include <linux/capability.h> 78884d179dSJan Kara #include <linux/quotaops.h> 7955fa6091SDave Chinner #include "../internal.h" /* ugh */ 80884d179dSJan Kara 81f3da9310SJeff Liu #include <linux/uaccess.h> 82884d179dSJan Kara 83884d179dSJan Kara /* 84884d179dSJan Kara * There are three quota SMP locks. dq_list_lock protects all lists with quotas 85dde95888SDmitry Monakhov * and quota formats. 86884d179dSJan Kara * dq_data_lock protects data from dq_dqb and also mem_dqinfo structures and 87884d179dSJan Kara * also guards consistency of dquot->dq_dqb with inode->i_blocks, i_bytes. 88884d179dSJan Kara * i_blocks and i_bytes updates itself are guarded by i_lock acquired directly 89884d179dSJan Kara * in inode_add_bytes() and inode_sub_bytes(). dq_state_lock protects 90884d179dSJan Kara * modifications of quota state (on quotaon and quotaoff) and readers who care 91884d179dSJan Kara * about latest values take it as well. 92884d179dSJan Kara * 93884d179dSJan Kara * The spinlock ordering is hence: dq_data_lock > dq_list_lock > i_lock, 94884d179dSJan Kara * dq_list_lock > dq_state_lock 95884d179dSJan Kara * 96884d179dSJan Kara * Note that some things (eg. sb pointer, type, id) doesn't change during 97884d179dSJan Kara * the life of the dquot structure and so needn't to be protected by a lock 98884d179dSJan Kara * 99b9ba6f94SNiu Yawei * Operation accessing dquots via inode pointers are protected by dquot_srcu. 100b9ba6f94SNiu Yawei * Operation of reading pointer needs srcu_read_lock(&dquot_srcu), and 101b9ba6f94SNiu Yawei * synchronize_srcu(&dquot_srcu) is called after clearing pointers from 102b9ba6f94SNiu Yawei * inode and before dropping dquot references to avoid use of dquots after 103b9ba6f94SNiu Yawei * they are freed. dq_data_lock is used to serialize the pointer setting and 104b9ba6f94SNiu Yawei * clearing operations. 10526245c94SJan Kara * Special care needs to be taken about S_NOQUOTA inode flag (marking that 10626245c94SJan Kara * inode is a quota file). Functions adding pointers from inode to dquots have 107b9ba6f94SNiu Yawei * to check this flag under dq_data_lock and then (if S_NOQUOTA is not set) they 108b9ba6f94SNiu Yawei * have to do all pointer modifications before dropping dq_data_lock. This makes 10926245c94SJan Kara * sure they cannot race with quotaon which first sets S_NOQUOTA flag and 11026245c94SJan Kara * then drops all pointers to dquots from an inode. 111884d179dSJan Kara * 112884d179dSJan Kara * Each dquot has its dq_lock mutex. Locked dquots might not be referenced 113884d179dSJan Kara * from inodes (dquot_alloc_space() and such don't check the dq_lock). 114884d179dSJan Kara * Currently dquot is locked only when it is being read to memory (or space for 115884d179dSJan Kara * it is being allocated) on the first dqget() and when it is being released on 116884d179dSJan Kara * the last dqput(). The allocation and release oparations are serialized by 117884d179dSJan Kara * the dq_lock and by checking the use count in dquot_release(). Write 118884d179dSJan Kara * operations on dquots don't hold dq_lock as they copy data under dq_data_lock 119884d179dSJan Kara * spinlock to internal buffers before writing. 120884d179dSJan Kara * 121884d179dSJan Kara * Lock ordering (including related VFS locks) is the following: 122b9ba6f94SNiu Yawei * dqonoff_mutex > i_mutex > journal_lock > dquot->dq_lock > dqio_mutex 123a80b12c3SJan Kara * dqonoff_mutex > i_mutex comes from dquot_quota_sync, dquot_enable, etc. 124884d179dSJan Kara */ 125884d179dSJan Kara 126c516610cSJan Kara static __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_list_lock); 127c516610cSJan Kara static __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_state_lock); 128c516610cSJan Kara __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_data_lock); 129884d179dSJan Kara EXPORT_SYMBOL(dq_data_lock); 130b9ba6f94SNiu Yawei DEFINE_STATIC_SRCU(dquot_srcu); 131884d179dSJan Kara 132fb5ffb0eSJiaying Zhang void __quota_error(struct super_block *sb, const char *func, 133fb5ffb0eSJiaying Zhang const char *fmt, ...) 134fb5ffb0eSJiaying Zhang { 135fb5ffb0eSJiaying Zhang if (printk_ratelimit()) { 136055adcbdSJoe Perches va_list args; 137055adcbdSJoe Perches struct va_format vaf; 138055adcbdSJoe Perches 139fb5ffb0eSJiaying Zhang va_start(args, fmt); 140055adcbdSJoe Perches 141055adcbdSJoe Perches vaf.fmt = fmt; 142055adcbdSJoe Perches vaf.va = &args; 143055adcbdSJoe Perches 144055adcbdSJoe Perches printk(KERN_ERR "Quota error (device %s): %s: %pV\n", 145055adcbdSJoe Perches sb->s_id, func, &vaf); 146055adcbdSJoe Perches 147fb5ffb0eSJiaying Zhang va_end(args); 148fb5ffb0eSJiaying Zhang } 149fb5ffb0eSJiaying Zhang } 150fb5ffb0eSJiaying Zhang EXPORT_SYMBOL(__quota_error); 151fb5ffb0eSJiaying Zhang 152da8d1ba2SSergey Senozhatsky #if defined(CONFIG_QUOTA_DEBUG) || defined(CONFIG_PRINT_QUOTA_WARNING) 153884d179dSJan Kara static char *quotatypes[] = INITQFNAMES; 154da8d1ba2SSergey Senozhatsky #endif 155884d179dSJan Kara static struct quota_format_type *quota_formats; /* List of registered formats */ 156884d179dSJan Kara static struct quota_module_name module_names[] = INIT_QUOTA_MODULE_NAMES; 157884d179dSJan Kara 158884d179dSJan Kara /* SLAB cache for dquot structures */ 159884d179dSJan Kara static struct kmem_cache *dquot_cachep; 160884d179dSJan Kara 161884d179dSJan Kara int register_quota_format(struct quota_format_type *fmt) 162884d179dSJan Kara { 163884d179dSJan Kara spin_lock(&dq_list_lock); 164884d179dSJan Kara fmt->qf_next = quota_formats; 165884d179dSJan Kara quota_formats = fmt; 166884d179dSJan Kara spin_unlock(&dq_list_lock); 167884d179dSJan Kara return 0; 168884d179dSJan Kara } 169884d179dSJan Kara EXPORT_SYMBOL(register_quota_format); 170884d179dSJan Kara 171884d179dSJan Kara void unregister_quota_format(struct quota_format_type *fmt) 172884d179dSJan Kara { 173884d179dSJan Kara struct quota_format_type **actqf; 174884d179dSJan Kara 175884d179dSJan Kara spin_lock(&dq_list_lock); 176268157baSJan Kara for (actqf = "a_formats; *actqf && *actqf != fmt; 177268157baSJan Kara actqf = &(*actqf)->qf_next) 178268157baSJan Kara ; 179884d179dSJan Kara if (*actqf) 180884d179dSJan Kara *actqf = (*actqf)->qf_next; 181884d179dSJan Kara spin_unlock(&dq_list_lock); 182884d179dSJan Kara } 183884d179dSJan Kara EXPORT_SYMBOL(unregister_quota_format); 184884d179dSJan Kara 185884d179dSJan Kara static struct quota_format_type *find_quota_format(int id) 186884d179dSJan Kara { 187884d179dSJan Kara struct quota_format_type *actqf; 188884d179dSJan Kara 189884d179dSJan Kara spin_lock(&dq_list_lock); 190268157baSJan Kara for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id; 191268157baSJan Kara actqf = actqf->qf_next) 192268157baSJan Kara ; 193884d179dSJan Kara if (!actqf || !try_module_get(actqf->qf_owner)) { 194884d179dSJan Kara int qm; 195884d179dSJan Kara 196884d179dSJan Kara spin_unlock(&dq_list_lock); 197884d179dSJan Kara 198268157baSJan Kara for (qm = 0; module_names[qm].qm_fmt_id && 199268157baSJan Kara module_names[qm].qm_fmt_id != id; qm++) 200268157baSJan Kara ; 201268157baSJan Kara if (!module_names[qm].qm_fmt_id || 202268157baSJan Kara request_module(module_names[qm].qm_mod_name)) 203884d179dSJan Kara return NULL; 204884d179dSJan Kara 205884d179dSJan Kara spin_lock(&dq_list_lock); 206268157baSJan Kara for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id; 207268157baSJan Kara actqf = actqf->qf_next) 208268157baSJan Kara ; 209884d179dSJan Kara if (actqf && !try_module_get(actqf->qf_owner)) 210884d179dSJan Kara actqf = NULL; 211884d179dSJan Kara } 212884d179dSJan Kara spin_unlock(&dq_list_lock); 213884d179dSJan Kara return actqf; 214884d179dSJan Kara } 215884d179dSJan Kara 216884d179dSJan Kara static void put_quota_format(struct quota_format_type *fmt) 217884d179dSJan Kara { 218884d179dSJan Kara module_put(fmt->qf_owner); 219884d179dSJan Kara } 220884d179dSJan Kara 221884d179dSJan Kara /* 222884d179dSJan Kara * Dquot List Management: 223884d179dSJan Kara * The quota code uses three lists for dquot management: the inuse_list, 224884d179dSJan Kara * free_dquots, and dquot_hash[] array. A single dquot structure may be 225884d179dSJan Kara * on all three lists, depending on its current state. 226884d179dSJan Kara * 227884d179dSJan Kara * All dquots are placed to the end of inuse_list when first created, and this 228884d179dSJan Kara * list is used for invalidate operation, which must look at every dquot. 229884d179dSJan Kara * 230884d179dSJan Kara * Unused dquots (dq_count == 0) are added to the free_dquots list when freed, 231884d179dSJan Kara * and this list is searched whenever we need an available dquot. Dquots are 232884d179dSJan Kara * removed from the list as soon as they are used again, and 233884d179dSJan Kara * dqstats.free_dquots gives the number of dquots on the list. When 234884d179dSJan Kara * dquot is invalidated it's completely released from memory. 235884d179dSJan Kara * 236884d179dSJan Kara * Dquots with a specific identity (device, type and id) are placed on 237884d179dSJan Kara * one of the dquot_hash[] hash chains. The provides an efficient search 238884d179dSJan Kara * mechanism to locate a specific dquot. 239884d179dSJan Kara */ 240884d179dSJan Kara 241884d179dSJan Kara static LIST_HEAD(inuse_list); 242884d179dSJan Kara static LIST_HEAD(free_dquots); 243884d179dSJan Kara static unsigned int dq_hash_bits, dq_hash_mask; 244884d179dSJan Kara static struct hlist_head *dquot_hash; 245884d179dSJan Kara 246884d179dSJan Kara struct dqstats dqstats; 247884d179dSJan Kara EXPORT_SYMBOL(dqstats); 248884d179dSJan Kara 2490a5a9c72SJan Kara static qsize_t inode_get_rsv_space(struct inode *inode); 2506184fc0bSJan Kara static int __dquot_initialize(struct inode *inode, int type); 2510a5a9c72SJan Kara 252884d179dSJan Kara static inline unsigned int 2531a06d420SEric W. Biederman hashfn(const struct super_block *sb, struct kqid qid) 254884d179dSJan Kara { 2551a06d420SEric W. Biederman unsigned int id = from_kqid(&init_user_ns, qid); 2561a06d420SEric W. Biederman int type = qid.type; 257884d179dSJan Kara unsigned long tmp; 258884d179dSJan Kara 259884d179dSJan Kara tmp = (((unsigned long)sb>>L1_CACHE_SHIFT) ^ id) * (MAXQUOTAS - type); 260884d179dSJan Kara return (tmp + (tmp >> dq_hash_bits)) & dq_hash_mask; 261884d179dSJan Kara } 262884d179dSJan Kara 263884d179dSJan Kara /* 264884d179dSJan Kara * Following list functions expect dq_list_lock to be held 265884d179dSJan Kara */ 266884d179dSJan Kara static inline void insert_dquot_hash(struct dquot *dquot) 267884d179dSJan Kara { 268268157baSJan Kara struct hlist_head *head; 2691a06d420SEric W. Biederman head = dquot_hash + hashfn(dquot->dq_sb, dquot->dq_id); 270884d179dSJan Kara hlist_add_head(&dquot->dq_hash, head); 271884d179dSJan Kara } 272884d179dSJan Kara 273884d179dSJan Kara static inline void remove_dquot_hash(struct dquot *dquot) 274884d179dSJan Kara { 275884d179dSJan Kara hlist_del_init(&dquot->dq_hash); 276884d179dSJan Kara } 277884d179dSJan Kara 2787a2435d8SJan Kara static struct dquot *find_dquot(unsigned int hashent, struct super_block *sb, 2791a06d420SEric W. Biederman struct kqid qid) 280884d179dSJan Kara { 281884d179dSJan Kara struct hlist_node *node; 282884d179dSJan Kara struct dquot *dquot; 283884d179dSJan Kara 284884d179dSJan Kara hlist_for_each (node, dquot_hash+hashent) { 285884d179dSJan Kara dquot = hlist_entry(node, struct dquot, dq_hash); 2864c376dcaSEric W. Biederman if (dquot->dq_sb == sb && qid_eq(dquot->dq_id, qid)) 287884d179dSJan Kara return dquot; 288884d179dSJan Kara } 289dd6f3c6dSJan Kara return NULL; 290884d179dSJan Kara } 291884d179dSJan Kara 292884d179dSJan Kara /* Add a dquot to the tail of the free list */ 293884d179dSJan Kara static inline void put_dquot_last(struct dquot *dquot) 294884d179dSJan Kara { 295884d179dSJan Kara list_add_tail(&dquot->dq_free, &free_dquots); 296dde95888SDmitry Monakhov dqstats_inc(DQST_FREE_DQUOTS); 297884d179dSJan Kara } 298884d179dSJan Kara 299884d179dSJan Kara static inline void remove_free_dquot(struct dquot *dquot) 300884d179dSJan Kara { 301884d179dSJan Kara if (list_empty(&dquot->dq_free)) 302884d179dSJan Kara return; 303884d179dSJan Kara list_del_init(&dquot->dq_free); 304dde95888SDmitry Monakhov dqstats_dec(DQST_FREE_DQUOTS); 305884d179dSJan Kara } 306884d179dSJan Kara 307884d179dSJan Kara static inline void put_inuse(struct dquot *dquot) 308884d179dSJan Kara { 309884d179dSJan Kara /* We add to the back of inuse list so we don't have to restart 310884d179dSJan Kara * when traversing this list and we block */ 311884d179dSJan Kara list_add_tail(&dquot->dq_inuse, &inuse_list); 312dde95888SDmitry Monakhov dqstats_inc(DQST_ALLOC_DQUOTS); 313884d179dSJan Kara } 314884d179dSJan Kara 315884d179dSJan Kara static inline void remove_inuse(struct dquot *dquot) 316884d179dSJan Kara { 317dde95888SDmitry Monakhov dqstats_dec(DQST_ALLOC_DQUOTS); 318884d179dSJan Kara list_del(&dquot->dq_inuse); 319884d179dSJan Kara } 320884d179dSJan Kara /* 321884d179dSJan Kara * End of list functions needing dq_list_lock 322884d179dSJan Kara */ 323884d179dSJan Kara 324884d179dSJan Kara static void wait_on_dquot(struct dquot *dquot) 325884d179dSJan Kara { 326884d179dSJan Kara mutex_lock(&dquot->dq_lock); 327884d179dSJan Kara mutex_unlock(&dquot->dq_lock); 328884d179dSJan Kara } 329884d179dSJan Kara 330884d179dSJan Kara static inline int dquot_dirty(struct dquot *dquot) 331884d179dSJan Kara { 332884d179dSJan Kara return test_bit(DQ_MOD_B, &dquot->dq_flags); 333884d179dSJan Kara } 334884d179dSJan Kara 335884d179dSJan Kara static inline int mark_dquot_dirty(struct dquot *dquot) 336884d179dSJan Kara { 337884d179dSJan Kara return dquot->dq_sb->dq_op->mark_dirty(dquot); 338884d179dSJan Kara } 339884d179dSJan Kara 340eabf290dSDmitry Monakhov /* Mark dquot dirty in atomic manner, and return it's old dirty flag state */ 341884d179dSJan Kara int dquot_mark_dquot_dirty(struct dquot *dquot) 342884d179dSJan Kara { 343eabf290dSDmitry Monakhov int ret = 1; 344eabf290dSDmitry Monakhov 345eabf290dSDmitry Monakhov /* If quota is dirty already, we don't have to acquire dq_list_lock */ 346eabf290dSDmitry Monakhov if (test_bit(DQ_MOD_B, &dquot->dq_flags)) 347eabf290dSDmitry Monakhov return 1; 348eabf290dSDmitry Monakhov 349884d179dSJan Kara spin_lock(&dq_list_lock); 350eabf290dSDmitry Monakhov if (!test_and_set_bit(DQ_MOD_B, &dquot->dq_flags)) { 351884d179dSJan Kara list_add(&dquot->dq_dirty, &sb_dqopt(dquot->dq_sb)-> 3524c376dcaSEric W. Biederman info[dquot->dq_id.type].dqi_dirty_list); 353eabf290dSDmitry Monakhov ret = 0; 354eabf290dSDmitry Monakhov } 355884d179dSJan Kara spin_unlock(&dq_list_lock); 356eabf290dSDmitry Monakhov return ret; 357884d179dSJan Kara } 358884d179dSJan Kara EXPORT_SYMBOL(dquot_mark_dquot_dirty); 359884d179dSJan Kara 360dc52dd3aSDmitry Monakhov /* Dirtify all the dquots - this can block when journalling */ 361dc52dd3aSDmitry Monakhov static inline int mark_all_dquot_dirty(struct dquot * const *dquot) 362dc52dd3aSDmitry Monakhov { 363dc52dd3aSDmitry Monakhov int ret, err, cnt; 364dc52dd3aSDmitry Monakhov 365dc52dd3aSDmitry Monakhov ret = err = 0; 366dc52dd3aSDmitry Monakhov for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 367dc52dd3aSDmitry Monakhov if (dquot[cnt]) 368dc52dd3aSDmitry Monakhov /* Even in case of error we have to continue */ 369dc52dd3aSDmitry Monakhov ret = mark_dquot_dirty(dquot[cnt]); 370dc52dd3aSDmitry Monakhov if (!err) 371dc52dd3aSDmitry Monakhov err = ret; 372dc52dd3aSDmitry Monakhov } 373dc52dd3aSDmitry Monakhov return err; 374dc52dd3aSDmitry Monakhov } 375dc52dd3aSDmitry Monakhov 376dc52dd3aSDmitry Monakhov static inline void dqput_all(struct dquot **dquot) 377dc52dd3aSDmitry Monakhov { 378dc52dd3aSDmitry Monakhov unsigned int cnt; 379dc52dd3aSDmitry Monakhov 380dc52dd3aSDmitry Monakhov for (cnt = 0; cnt < MAXQUOTAS; cnt++) 381dc52dd3aSDmitry Monakhov dqput(dquot[cnt]); 382dc52dd3aSDmitry Monakhov } 383dc52dd3aSDmitry Monakhov 384884d179dSJan Kara /* This function needs dq_list_lock */ 385884d179dSJan Kara static inline int clear_dquot_dirty(struct dquot *dquot) 386884d179dSJan Kara { 387884d179dSJan Kara if (!test_and_clear_bit(DQ_MOD_B, &dquot->dq_flags)) 388884d179dSJan Kara return 0; 389884d179dSJan Kara list_del_init(&dquot->dq_dirty); 390884d179dSJan Kara return 1; 391884d179dSJan Kara } 392884d179dSJan Kara 393884d179dSJan Kara void mark_info_dirty(struct super_block *sb, int type) 394884d179dSJan Kara { 395884d179dSJan Kara set_bit(DQF_INFO_DIRTY_B, &sb_dqopt(sb)->info[type].dqi_flags); 396884d179dSJan Kara } 397884d179dSJan Kara EXPORT_SYMBOL(mark_info_dirty); 398884d179dSJan Kara 399884d179dSJan Kara /* 400884d179dSJan Kara * Read dquot from disk and alloc space for it 401884d179dSJan Kara */ 402884d179dSJan Kara 403884d179dSJan Kara int dquot_acquire(struct dquot *dquot) 404884d179dSJan Kara { 405884d179dSJan Kara int ret = 0, ret2 = 0; 406884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); 407884d179dSJan Kara 408884d179dSJan Kara mutex_lock(&dquot->dq_lock); 409884d179dSJan Kara mutex_lock(&dqopt->dqio_mutex); 410884d179dSJan Kara if (!test_bit(DQ_READ_B, &dquot->dq_flags)) 4114c376dcaSEric W. Biederman ret = dqopt->ops[dquot->dq_id.type]->read_dqblk(dquot); 412884d179dSJan Kara if (ret < 0) 413884d179dSJan Kara goto out_iolock; 414044c9b67SJan Kara /* Make sure flags update is visible after dquot has been filled */ 415044c9b67SJan Kara smp_mb__before_atomic(); 416884d179dSJan Kara set_bit(DQ_READ_B, &dquot->dq_flags); 417884d179dSJan Kara /* Instantiate dquot if needed */ 418884d179dSJan Kara if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && !dquot->dq_off) { 4194c376dcaSEric W. Biederman ret = dqopt->ops[dquot->dq_id.type]->commit_dqblk(dquot); 420884d179dSJan Kara /* Write the info if needed */ 4214c376dcaSEric W. Biederman if (info_dirty(&dqopt->info[dquot->dq_id.type])) { 4224c376dcaSEric W. Biederman ret2 = dqopt->ops[dquot->dq_id.type]->write_file_info( 4234c376dcaSEric W. Biederman dquot->dq_sb, dquot->dq_id.type); 424268157baSJan Kara } 425884d179dSJan Kara if (ret < 0) 426884d179dSJan Kara goto out_iolock; 427884d179dSJan Kara if (ret2 < 0) { 428884d179dSJan Kara ret = ret2; 429884d179dSJan Kara goto out_iolock; 430884d179dSJan Kara } 431884d179dSJan Kara } 432044c9b67SJan Kara /* 433044c9b67SJan Kara * Make sure flags update is visible after on-disk struct has been 434044c9b67SJan Kara * allocated. Paired with smp_rmb() in dqget(). 435044c9b67SJan Kara */ 436044c9b67SJan Kara smp_mb__before_atomic(); 437884d179dSJan Kara set_bit(DQ_ACTIVE_B, &dquot->dq_flags); 438884d179dSJan Kara out_iolock: 439884d179dSJan Kara mutex_unlock(&dqopt->dqio_mutex); 440884d179dSJan Kara mutex_unlock(&dquot->dq_lock); 441884d179dSJan Kara return ret; 442884d179dSJan Kara } 443884d179dSJan Kara EXPORT_SYMBOL(dquot_acquire); 444884d179dSJan Kara 445884d179dSJan Kara /* 446884d179dSJan Kara * Write dquot to disk 447884d179dSJan Kara */ 448884d179dSJan Kara int dquot_commit(struct dquot *dquot) 449884d179dSJan Kara { 450b03f2456SJan Kara int ret = 0; 451884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); 452884d179dSJan Kara 453884d179dSJan Kara mutex_lock(&dqopt->dqio_mutex); 454884d179dSJan Kara spin_lock(&dq_list_lock); 455884d179dSJan Kara if (!clear_dquot_dirty(dquot)) { 456884d179dSJan Kara spin_unlock(&dq_list_lock); 457884d179dSJan Kara goto out_sem; 458884d179dSJan Kara } 459884d179dSJan Kara spin_unlock(&dq_list_lock); 460884d179dSJan Kara /* Inactive dquot can be only if there was error during read/init 461884d179dSJan Kara * => we have better not writing it */ 462b03f2456SJan Kara if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) 4634c376dcaSEric W. Biederman ret = dqopt->ops[dquot->dq_id.type]->commit_dqblk(dquot); 464b03f2456SJan Kara else 465b03f2456SJan Kara ret = -EIO; 466884d179dSJan Kara out_sem: 467884d179dSJan Kara mutex_unlock(&dqopt->dqio_mutex); 468884d179dSJan Kara return ret; 469884d179dSJan Kara } 470884d179dSJan Kara EXPORT_SYMBOL(dquot_commit); 471884d179dSJan Kara 472884d179dSJan Kara /* 473884d179dSJan Kara * Release dquot 474884d179dSJan Kara */ 475884d179dSJan Kara int dquot_release(struct dquot *dquot) 476884d179dSJan Kara { 477884d179dSJan Kara int ret = 0, ret2 = 0; 478884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); 479884d179dSJan Kara 480884d179dSJan Kara mutex_lock(&dquot->dq_lock); 481884d179dSJan Kara /* Check whether we are not racing with some other dqget() */ 482884d179dSJan Kara if (atomic_read(&dquot->dq_count) > 1) 483884d179dSJan Kara goto out_dqlock; 484884d179dSJan Kara mutex_lock(&dqopt->dqio_mutex); 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 mutex_unlock(&dqopt->dqio_mutex); 497884d179dSJan Kara out_dqlock: 498884d179dSJan Kara mutex_unlock(&dquot->dq_lock); 499884d179dSJan Kara return ret; 500884d179dSJan Kara } 501884d179dSJan Kara EXPORT_SYMBOL(dquot_release); 502884d179dSJan Kara 503884d179dSJan Kara void dquot_destroy(struct dquot *dquot) 504884d179dSJan Kara { 505884d179dSJan Kara kmem_cache_free(dquot_cachep, dquot); 506884d179dSJan Kara } 507884d179dSJan Kara EXPORT_SYMBOL(dquot_destroy); 508884d179dSJan Kara 509884d179dSJan Kara static inline void do_destroy_dquot(struct dquot *dquot) 510884d179dSJan Kara { 511884d179dSJan Kara dquot->dq_sb->dq_op->destroy_dquot(dquot); 512884d179dSJan Kara } 513884d179dSJan Kara 514884d179dSJan Kara /* Invalidate all dquots on the list. Note that this function is called after 515884d179dSJan Kara * quota is disabled and pointers from inodes removed so there cannot be new 516884d179dSJan Kara * quota users. There can still be some users of quotas due to inodes being 517884d179dSJan Kara * just deleted or pruned by prune_icache() (those are not attached to any 518884d179dSJan Kara * list) or parallel quotactl call. We have to wait for such users. 519884d179dSJan Kara */ 520884d179dSJan Kara static void invalidate_dquots(struct super_block *sb, int type) 521884d179dSJan Kara { 522884d179dSJan Kara struct dquot *dquot, *tmp; 523884d179dSJan Kara 524884d179dSJan Kara restart: 525884d179dSJan Kara spin_lock(&dq_list_lock); 526884d179dSJan Kara list_for_each_entry_safe(dquot, tmp, &inuse_list, dq_inuse) { 527884d179dSJan Kara if (dquot->dq_sb != sb) 528884d179dSJan Kara continue; 5294c376dcaSEric W. Biederman if (dquot->dq_id.type != type) 530884d179dSJan Kara continue; 531884d179dSJan Kara /* Wait for dquot users */ 532884d179dSJan Kara if (atomic_read(&dquot->dq_count)) { 533884d179dSJan Kara DEFINE_WAIT(wait); 534884d179dSJan Kara 5359f985cb6SJan Kara dqgrab(dquot); 536884d179dSJan Kara prepare_to_wait(&dquot->dq_wait_unused, &wait, 537884d179dSJan Kara TASK_UNINTERRUPTIBLE); 538884d179dSJan Kara spin_unlock(&dq_list_lock); 539884d179dSJan Kara /* Once dqput() wakes us up, we know it's time to free 540884d179dSJan Kara * the dquot. 541884d179dSJan Kara * IMPORTANT: we rely on the fact that there is always 542884d179dSJan Kara * at most one process waiting for dquot to free. 543884d179dSJan Kara * Otherwise dq_count would be > 1 and we would never 544884d179dSJan Kara * wake up. 545884d179dSJan Kara */ 546884d179dSJan Kara if (atomic_read(&dquot->dq_count) > 1) 547884d179dSJan Kara schedule(); 548884d179dSJan Kara finish_wait(&dquot->dq_wait_unused, &wait); 549884d179dSJan Kara dqput(dquot); 550884d179dSJan Kara /* At this moment dquot() need not exist (it could be 551884d179dSJan Kara * reclaimed by prune_dqcache(). Hence we must 552884d179dSJan Kara * restart. */ 553884d179dSJan Kara goto restart; 554884d179dSJan Kara } 555884d179dSJan Kara /* 556884d179dSJan Kara * Quota now has no users and it has been written on last 557884d179dSJan Kara * dqput() 558884d179dSJan Kara */ 559884d179dSJan Kara remove_dquot_hash(dquot); 560884d179dSJan Kara remove_free_dquot(dquot); 561884d179dSJan Kara remove_inuse(dquot); 562884d179dSJan Kara do_destroy_dquot(dquot); 563884d179dSJan Kara } 564884d179dSJan Kara spin_unlock(&dq_list_lock); 565884d179dSJan Kara } 566884d179dSJan Kara 567884d179dSJan Kara /* Call callback for every active dquot on given filesystem */ 568884d179dSJan Kara int dquot_scan_active(struct super_block *sb, 569884d179dSJan Kara int (*fn)(struct dquot *dquot, unsigned long priv), 570884d179dSJan Kara unsigned long priv) 571884d179dSJan Kara { 572884d179dSJan Kara struct dquot *dquot, *old_dquot = NULL; 573884d179dSJan Kara int ret = 0; 574884d179dSJan Kara 575884d179dSJan Kara mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); 576884d179dSJan Kara spin_lock(&dq_list_lock); 577884d179dSJan Kara list_for_each_entry(dquot, &inuse_list, dq_inuse) { 578884d179dSJan Kara if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) 579884d179dSJan Kara continue; 580884d179dSJan Kara if (dquot->dq_sb != sb) 581884d179dSJan Kara continue; 582884d179dSJan Kara /* Now we have active dquot so we can just increase use count */ 583884d179dSJan Kara atomic_inc(&dquot->dq_count); 584884d179dSJan Kara spin_unlock(&dq_list_lock); 585dde95888SDmitry Monakhov dqstats_inc(DQST_LOOKUPS); 586884d179dSJan Kara dqput(old_dquot); 587884d179dSJan Kara old_dquot = dquot; 5881362f4eaSJan Kara /* 5891362f4eaSJan Kara * ->release_dquot() can be racing with us. Our reference 5901362f4eaSJan Kara * protects us from new calls to it so just wait for any 5911362f4eaSJan Kara * outstanding call and recheck the DQ_ACTIVE_B after that. 5921362f4eaSJan Kara */ 5931362f4eaSJan Kara wait_on_dquot(dquot); 5941362f4eaSJan Kara if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { 595884d179dSJan Kara ret = fn(dquot, priv); 596884d179dSJan Kara if (ret < 0) 597884d179dSJan Kara goto out; 5981362f4eaSJan Kara } 599884d179dSJan Kara spin_lock(&dq_list_lock); 600884d179dSJan Kara /* We are safe to continue now because our dquot could not 601884d179dSJan Kara * be moved out of the inuse list while we hold the reference */ 602884d179dSJan Kara } 603884d179dSJan Kara spin_unlock(&dq_list_lock); 604884d179dSJan Kara out: 605884d179dSJan Kara dqput(old_dquot); 606884d179dSJan Kara mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); 607884d179dSJan Kara return ret; 608884d179dSJan Kara } 609884d179dSJan Kara EXPORT_SYMBOL(dquot_scan_active); 610884d179dSJan Kara 611ceed1723SJan Kara /* Write all dquot structures to quota files */ 612ceed1723SJan Kara int dquot_writeback_dquots(struct super_block *sb, int type) 613884d179dSJan Kara { 614884d179dSJan Kara struct list_head *dirty; 615884d179dSJan Kara struct dquot *dquot; 616884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 617884d179dSJan Kara int cnt; 618ceed1723SJan Kara int err, ret = 0; 619884d179dSJan Kara 620884d179dSJan Kara mutex_lock(&dqopt->dqonoff_mutex); 621884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 622884d179dSJan Kara if (type != -1 && cnt != type) 623884d179dSJan Kara continue; 624884d179dSJan Kara if (!sb_has_quota_active(sb, cnt)) 625884d179dSJan Kara continue; 626884d179dSJan Kara spin_lock(&dq_list_lock); 627884d179dSJan Kara dirty = &dqopt->info[cnt].dqi_dirty_list; 628884d179dSJan Kara while (!list_empty(dirty)) { 629268157baSJan Kara dquot = list_first_entry(dirty, struct dquot, 630268157baSJan Kara dq_dirty); 631884d179dSJan Kara /* Dirty and inactive can be only bad dquot... */ 632884d179dSJan Kara if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { 633884d179dSJan Kara clear_dquot_dirty(dquot); 634884d179dSJan Kara continue; 635884d179dSJan Kara } 636884d179dSJan Kara /* Now we have active dquot from which someone is 637884d179dSJan Kara * holding reference so we can safely just increase 638884d179dSJan Kara * use count */ 6399f985cb6SJan Kara dqgrab(dquot); 640884d179dSJan Kara spin_unlock(&dq_list_lock); 641dde95888SDmitry Monakhov dqstats_inc(DQST_LOOKUPS); 642ceed1723SJan Kara err = sb->dq_op->write_dquot(dquot); 643ceed1723SJan Kara if (!ret && err) 644474d2605SJan Kara ret = err; 645884d179dSJan Kara dqput(dquot); 646884d179dSJan Kara spin_lock(&dq_list_lock); 647884d179dSJan Kara } 648884d179dSJan Kara spin_unlock(&dq_list_lock); 649884d179dSJan Kara } 650884d179dSJan Kara 651884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 652884d179dSJan Kara if ((cnt == type || type == -1) && sb_has_quota_active(sb, cnt) 653884d179dSJan Kara && info_dirty(&dqopt->info[cnt])) 654884d179dSJan Kara sb->dq_op->write_info(sb, cnt); 655dde95888SDmitry Monakhov dqstats_inc(DQST_SYNCS); 656884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 657884d179dSJan Kara 658ceed1723SJan Kara return ret; 659ceed1723SJan Kara } 660ceed1723SJan Kara EXPORT_SYMBOL(dquot_writeback_dquots); 661ceed1723SJan Kara 662ceed1723SJan Kara /* Write all dquot structures to disk and make them visible from userspace */ 663ceed1723SJan Kara int dquot_quota_sync(struct super_block *sb, int type) 664ceed1723SJan Kara { 665ceed1723SJan Kara struct quota_info *dqopt = sb_dqopt(sb); 666ceed1723SJan Kara int cnt; 667ceed1723SJan Kara int ret; 668ceed1723SJan Kara 669ceed1723SJan Kara ret = dquot_writeback_dquots(sb, type); 670ceed1723SJan Kara if (ret) 671ceed1723SJan Kara return ret; 672ceed1723SJan Kara if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) 6735fb324adSChristoph Hellwig return 0; 6745fb324adSChristoph Hellwig 6755fb324adSChristoph Hellwig /* This is not very clever (and fast) but currently I don't know about 6765fb324adSChristoph Hellwig * any other simple way of getting quota data to disk and we must get 6775fb324adSChristoph Hellwig * them there for userspace to be visible... */ 6785fb324adSChristoph Hellwig if (sb->s_op->sync_fs) 6795fb324adSChristoph Hellwig sb->s_op->sync_fs(sb, 1); 6805fb324adSChristoph Hellwig sync_blockdev(sb->s_bdev); 6815fb324adSChristoph Hellwig 6825fb324adSChristoph Hellwig /* 6835fb324adSChristoph Hellwig * Now when everything is written we can discard the pagecache so 6845fb324adSChristoph Hellwig * that userspace sees the changes. 6855fb324adSChristoph Hellwig */ 686f9ef1784SJan Kara mutex_lock(&dqopt->dqonoff_mutex); 6875fb324adSChristoph Hellwig for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 6885fb324adSChristoph Hellwig if (type != -1 && cnt != type) 6895fb324adSChristoph Hellwig continue; 6905fb324adSChristoph Hellwig if (!sb_has_quota_active(sb, cnt)) 6915fb324adSChristoph Hellwig continue; 6925955102cSAl Viro inode_lock(dqopt->files[cnt]); 693f9ef1784SJan Kara truncate_inode_pages(&dqopt->files[cnt]->i_data, 0); 6945955102cSAl Viro inode_unlock(dqopt->files[cnt]); 6955fb324adSChristoph Hellwig } 696f9ef1784SJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 6975fb324adSChristoph Hellwig 698884d179dSJan Kara return 0; 699884d179dSJan Kara } 700287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_quota_sync); 701884d179dSJan Kara 7021ab6c499SDave Chinner static unsigned long 7031ab6c499SDave Chinner dqcache_shrink_scan(struct shrinker *shrink, struct shrink_control *sc) 704884d179dSJan Kara { 705884d179dSJan Kara struct list_head *head; 706884d179dSJan Kara struct dquot *dquot; 7071ab6c499SDave Chinner unsigned long freed = 0; 708884d179dSJan Kara 709d68aab6bSNiu Yawei spin_lock(&dq_list_lock); 710884d179dSJan Kara head = free_dquots.prev; 7111ab6c499SDave Chinner while (head != &free_dquots && sc->nr_to_scan) { 712884d179dSJan Kara dquot = list_entry(head, struct dquot, dq_free); 713884d179dSJan Kara remove_dquot_hash(dquot); 714884d179dSJan Kara remove_free_dquot(dquot); 715884d179dSJan Kara remove_inuse(dquot); 716884d179dSJan Kara do_destroy_dquot(dquot); 7171ab6c499SDave Chinner sc->nr_to_scan--; 7181ab6c499SDave Chinner freed++; 719884d179dSJan Kara head = free_dquots.prev; 720884d179dSJan Kara } 721d68aab6bSNiu Yawei spin_unlock(&dq_list_lock); 7221ab6c499SDave Chinner return freed; 723884d179dSJan Kara } 724884d179dSJan Kara 7251ab6c499SDave Chinner static unsigned long 7261ab6c499SDave Chinner dqcache_shrink_count(struct shrinker *shrink, struct shrink_control *sc) 727884d179dSJan Kara { 72855f841ceSGlauber Costa return vfs_pressure_ratio( 72955f841ceSGlauber Costa percpu_counter_read_positive(&dqstats.counter[DQST_FREE_DQUOTS])); 730884d179dSJan Kara } 731884d179dSJan Kara 732884d179dSJan Kara static struct shrinker dqcache_shrinker = { 7331ab6c499SDave Chinner .count_objects = dqcache_shrink_count, 7341ab6c499SDave Chinner .scan_objects = dqcache_shrink_scan, 735884d179dSJan Kara .seeks = DEFAULT_SEEKS, 736884d179dSJan Kara }; 737884d179dSJan Kara 738884d179dSJan Kara /* 739884d179dSJan Kara * Put reference to dquot 740884d179dSJan Kara */ 741884d179dSJan Kara void dqput(struct dquot *dquot) 742884d179dSJan Kara { 743884d179dSJan Kara int ret; 744884d179dSJan Kara 745884d179dSJan Kara if (!dquot) 746884d179dSJan Kara return; 74762af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 748884d179dSJan Kara if (!atomic_read(&dquot->dq_count)) { 749fb5ffb0eSJiaying Zhang quota_error(dquot->dq_sb, "trying to free free dquot of %s %d", 7504c376dcaSEric W. Biederman quotatypes[dquot->dq_id.type], 7514c376dcaSEric W. Biederman from_kqid(&init_user_ns, dquot->dq_id)); 752884d179dSJan Kara BUG(); 753884d179dSJan Kara } 754884d179dSJan Kara #endif 755dde95888SDmitry Monakhov dqstats_inc(DQST_DROPS); 756884d179dSJan Kara we_slept: 757884d179dSJan Kara spin_lock(&dq_list_lock); 758884d179dSJan Kara if (atomic_read(&dquot->dq_count) > 1) { 759884d179dSJan Kara /* We have more than one user... nothing to do */ 760884d179dSJan Kara atomic_dec(&dquot->dq_count); 761884d179dSJan Kara /* Releasing dquot during quotaoff phase? */ 7624c376dcaSEric W. Biederman if (!sb_has_quota_active(dquot->dq_sb, dquot->dq_id.type) && 763884d179dSJan Kara atomic_read(&dquot->dq_count) == 1) 764884d179dSJan Kara wake_up(&dquot->dq_wait_unused); 765884d179dSJan Kara spin_unlock(&dq_list_lock); 766884d179dSJan Kara return; 767884d179dSJan Kara } 768884d179dSJan Kara /* Need to release dquot? */ 769884d179dSJan Kara if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && dquot_dirty(dquot)) { 770884d179dSJan Kara spin_unlock(&dq_list_lock); 771884d179dSJan Kara /* Commit dquot before releasing */ 772884d179dSJan Kara ret = dquot->dq_sb->dq_op->write_dquot(dquot); 773884d179dSJan Kara if (ret < 0) { 774fb5ffb0eSJiaying Zhang quota_error(dquot->dq_sb, "Can't write quota structure" 775fb5ffb0eSJiaying Zhang " (error %d). Quota may get out of sync!", 776fb5ffb0eSJiaying Zhang ret); 777884d179dSJan Kara /* 778884d179dSJan Kara * We clear dirty bit anyway, so that we avoid 779884d179dSJan Kara * infinite loop here 780884d179dSJan Kara */ 781884d179dSJan Kara spin_lock(&dq_list_lock); 782884d179dSJan Kara clear_dquot_dirty(dquot); 783884d179dSJan Kara spin_unlock(&dq_list_lock); 784884d179dSJan Kara } 785884d179dSJan Kara goto we_slept; 786884d179dSJan Kara } 787884d179dSJan Kara /* Clear flag in case dquot was inactive (something bad happened) */ 788884d179dSJan Kara clear_dquot_dirty(dquot); 789884d179dSJan Kara if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { 790884d179dSJan Kara spin_unlock(&dq_list_lock); 791884d179dSJan Kara dquot->dq_sb->dq_op->release_dquot(dquot); 792884d179dSJan Kara goto we_slept; 793884d179dSJan Kara } 794884d179dSJan Kara atomic_dec(&dquot->dq_count); 79562af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 796884d179dSJan Kara /* sanity check */ 797884d179dSJan Kara BUG_ON(!list_empty(&dquot->dq_free)); 798884d179dSJan Kara #endif 799884d179dSJan Kara put_dquot_last(dquot); 800884d179dSJan Kara spin_unlock(&dq_list_lock); 801884d179dSJan Kara } 802884d179dSJan Kara EXPORT_SYMBOL(dqput); 803884d179dSJan Kara 804884d179dSJan Kara struct dquot *dquot_alloc(struct super_block *sb, int type) 805884d179dSJan Kara { 806884d179dSJan Kara return kmem_cache_zalloc(dquot_cachep, GFP_NOFS); 807884d179dSJan Kara } 808884d179dSJan Kara EXPORT_SYMBOL(dquot_alloc); 809884d179dSJan Kara 810884d179dSJan Kara static struct dquot *get_empty_dquot(struct super_block *sb, int type) 811884d179dSJan Kara { 812884d179dSJan Kara struct dquot *dquot; 813884d179dSJan Kara 814884d179dSJan Kara dquot = sb->dq_op->alloc_dquot(sb, type); 815884d179dSJan Kara if(!dquot) 816dd6f3c6dSJan Kara return NULL; 817884d179dSJan Kara 818884d179dSJan Kara mutex_init(&dquot->dq_lock); 819884d179dSJan Kara INIT_LIST_HEAD(&dquot->dq_free); 820884d179dSJan Kara INIT_LIST_HEAD(&dquot->dq_inuse); 821884d179dSJan Kara INIT_HLIST_NODE(&dquot->dq_hash); 822884d179dSJan Kara INIT_LIST_HEAD(&dquot->dq_dirty); 823884d179dSJan Kara init_waitqueue_head(&dquot->dq_wait_unused); 824884d179dSJan Kara dquot->dq_sb = sb; 8251a06d420SEric W. Biederman dquot->dq_id = make_kqid_invalid(type); 826884d179dSJan Kara atomic_set(&dquot->dq_count, 1); 827884d179dSJan Kara 828884d179dSJan Kara return dquot; 829884d179dSJan Kara } 830884d179dSJan Kara 831884d179dSJan Kara /* 832884d179dSJan Kara * Get reference to dquot 833884d179dSJan Kara * 834884d179dSJan Kara * Locking is slightly tricky here. We are guarded from parallel quotaoff() 835884d179dSJan Kara * destroying our dquot by: 836884d179dSJan Kara * a) checking for quota flags under dq_list_lock and 837884d179dSJan Kara * b) getting a reference to dquot before we release dq_list_lock 838884d179dSJan Kara */ 839aca645a6SEric W. Biederman struct dquot *dqget(struct super_block *sb, struct kqid qid) 840884d179dSJan Kara { 8411a06d420SEric W. Biederman unsigned int hashent = hashfn(sb, qid); 8426184fc0bSJan Kara struct dquot *dquot, *empty = NULL; 843884d179dSJan Kara 8441a06d420SEric W. Biederman if (!sb_has_quota_active(sb, qid.type)) 8456184fc0bSJan Kara return ERR_PTR(-ESRCH); 846884d179dSJan Kara we_slept: 847884d179dSJan Kara spin_lock(&dq_list_lock); 848884d179dSJan Kara spin_lock(&dq_state_lock); 8491a06d420SEric W. Biederman if (!sb_has_quota_active(sb, qid.type)) { 850884d179dSJan Kara spin_unlock(&dq_state_lock); 851884d179dSJan Kara spin_unlock(&dq_list_lock); 8526184fc0bSJan Kara dquot = ERR_PTR(-ESRCH); 853884d179dSJan Kara goto out; 854884d179dSJan Kara } 855884d179dSJan Kara spin_unlock(&dq_state_lock); 856884d179dSJan Kara 8571a06d420SEric W. Biederman dquot = find_dquot(hashent, sb, qid); 858dd6f3c6dSJan Kara if (!dquot) { 859dd6f3c6dSJan Kara if (!empty) { 860884d179dSJan Kara spin_unlock(&dq_list_lock); 8611a06d420SEric W. Biederman empty = get_empty_dquot(sb, qid.type); 862dd6f3c6dSJan Kara if (!empty) 863884d179dSJan Kara schedule(); /* Try to wait for a moment... */ 864884d179dSJan Kara goto we_slept; 865884d179dSJan Kara } 866884d179dSJan Kara dquot = empty; 867dd6f3c6dSJan Kara empty = NULL; 8684c376dcaSEric W. Biederman dquot->dq_id = qid; 869884d179dSJan Kara /* all dquots go on the inuse_list */ 870884d179dSJan Kara put_inuse(dquot); 871884d179dSJan Kara /* hash it first so it can be found */ 872884d179dSJan Kara insert_dquot_hash(dquot); 873884d179dSJan Kara spin_unlock(&dq_list_lock); 874dde95888SDmitry Monakhov dqstats_inc(DQST_LOOKUPS); 875884d179dSJan Kara } else { 876884d179dSJan Kara if (!atomic_read(&dquot->dq_count)) 877884d179dSJan Kara remove_free_dquot(dquot); 878884d179dSJan Kara atomic_inc(&dquot->dq_count); 879884d179dSJan Kara spin_unlock(&dq_list_lock); 880dde95888SDmitry Monakhov dqstats_inc(DQST_CACHE_HITS); 881dde95888SDmitry Monakhov dqstats_inc(DQST_LOOKUPS); 882884d179dSJan Kara } 883268157baSJan Kara /* Wait for dq_lock - after this we know that either dquot_release() is 884268157baSJan Kara * already finished or it will be canceled due to dq_count > 1 test */ 885884d179dSJan Kara wait_on_dquot(dquot); 886268157baSJan Kara /* Read the dquot / allocate space in quota file */ 8876184fc0bSJan Kara if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { 8886184fc0bSJan Kara int err; 8896184fc0bSJan Kara 8906184fc0bSJan Kara err = sb->dq_op->acquire_dquot(dquot); 8916184fc0bSJan Kara if (err < 0) { 892884d179dSJan Kara dqput(dquot); 8936184fc0bSJan Kara dquot = ERR_PTR(err); 894884d179dSJan Kara goto out; 895884d179dSJan Kara } 8966184fc0bSJan Kara } 897044c9b67SJan Kara /* 898044c9b67SJan Kara * Make sure following reads see filled structure - paired with 899044c9b67SJan Kara * smp_mb__before_atomic() in dquot_acquire(). 900044c9b67SJan Kara */ 901044c9b67SJan Kara smp_rmb(); 90262af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 903884d179dSJan Kara BUG_ON(!dquot->dq_sb); /* Has somebody invalidated entry under us? */ 904884d179dSJan Kara #endif 905884d179dSJan Kara out: 906884d179dSJan Kara if (empty) 907884d179dSJan Kara do_destroy_dquot(empty); 908884d179dSJan Kara 909884d179dSJan Kara return dquot; 910884d179dSJan Kara } 911884d179dSJan Kara EXPORT_SYMBOL(dqget); 912884d179dSJan Kara 9132d0fa467SJan Kara static inline struct dquot **i_dquot(struct inode *inode) 9142d0fa467SJan Kara { 9152d0fa467SJan Kara return inode->i_sb->s_op->get_dquots(inode); 9162d0fa467SJan Kara } 9172d0fa467SJan Kara 918884d179dSJan Kara static int dqinit_needed(struct inode *inode, int type) 919884d179dSJan Kara { 9205bcd3b6fSKonstantin Khlebnikov struct dquot * const *dquots; 921884d179dSJan Kara int cnt; 922884d179dSJan Kara 923884d179dSJan Kara if (IS_NOQUOTA(inode)) 924884d179dSJan Kara return 0; 9255bcd3b6fSKonstantin Khlebnikov 9265bcd3b6fSKonstantin Khlebnikov dquots = i_dquot(inode); 927884d179dSJan Kara if (type != -1) 9285bcd3b6fSKonstantin Khlebnikov return !dquots[type]; 929884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 9305bcd3b6fSKonstantin Khlebnikov if (!dquots[cnt]) 931884d179dSJan Kara return 1; 932884d179dSJan Kara return 0; 933884d179dSJan Kara } 934884d179dSJan Kara 935884d179dSJan Kara /* This routine is guarded by dqonoff_mutex mutex */ 936884d179dSJan Kara static void add_dquot_ref(struct super_block *sb, int type) 937884d179dSJan Kara { 938884d179dSJan Kara struct inode *inode, *old_inode = NULL; 93962af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 9400a5a9c72SJan Kara int reserved = 0; 9414c5e6c0eSJan Kara #endif 942884d179dSJan Kara 94374278da9SDave Chinner spin_lock(&sb->s_inode_list_lock); 944884d179dSJan Kara list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { 945250df6edSDave Chinner spin_lock(&inode->i_lock); 946250df6edSDave Chinner if ((inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW)) || 947250df6edSDave Chinner !atomic_read(&inode->i_writecount) || 948250df6edSDave Chinner !dqinit_needed(inode, type)) { 949250df6edSDave Chinner spin_unlock(&inode->i_lock); 9503ae5080fSLinus Torvalds continue; 951250df6edSDave Chinner } 952884d179dSJan Kara __iget(inode); 953250df6edSDave Chinner spin_unlock(&inode->i_lock); 95474278da9SDave Chinner spin_unlock(&sb->s_inode_list_lock); 955884d179dSJan Kara 956d7e97117SJan Kara #ifdef CONFIG_QUOTA_DEBUG 957d7e97117SJan Kara if (unlikely(inode_get_rsv_space(inode) > 0)) 958d7e97117SJan Kara reserved = 1; 959d7e97117SJan Kara #endif 960884d179dSJan Kara iput(old_inode); 961871a2931SChristoph Hellwig __dquot_initialize(inode, type); 96255fa6091SDave Chinner 96355fa6091SDave Chinner /* 96455fa6091SDave Chinner * We hold a reference to 'inode' so it couldn't have been 96555fa6091SDave Chinner * removed from s_inodes list while we dropped the 96674278da9SDave Chinner * s_inode_list_lock. We cannot iput the inode now as we can be 96755fa6091SDave Chinner * holding the last reference and we cannot iput it under 96874278da9SDave Chinner * s_inode_list_lock. So we keep the reference and iput it 96955fa6091SDave Chinner * later. 97055fa6091SDave Chinner */ 971884d179dSJan Kara old_inode = inode; 97274278da9SDave Chinner spin_lock(&sb->s_inode_list_lock); 973884d179dSJan Kara } 97474278da9SDave Chinner spin_unlock(&sb->s_inode_list_lock); 975884d179dSJan Kara iput(old_inode); 9760a5a9c72SJan Kara 97762af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 9780a5a9c72SJan Kara if (reserved) { 979fb5ffb0eSJiaying Zhang quota_error(sb, "Writes happened before quota was turned on " 980fb5ffb0eSJiaying Zhang "thus quota information is probably inconsistent. " 981fb5ffb0eSJiaying Zhang "Please run quotacheck(8)"); 9820a5a9c72SJan Kara } 9834c5e6c0eSJan Kara #endif 984884d179dSJan Kara } 985884d179dSJan Kara 986268157baSJan Kara /* 987268157baSJan Kara * Remove references to dquots from inode and add dquot to list for freeing 98825985edcSLucas De Marchi * if we have the last reference to dquot 989268157baSJan Kara */ 9909eb6463fSNiu Yawei static void remove_inode_dquot_ref(struct inode *inode, int type, 991884d179dSJan Kara struct list_head *tofree_head) 992884d179dSJan Kara { 9935bcd3b6fSKonstantin Khlebnikov struct dquot **dquots = i_dquot(inode); 9945bcd3b6fSKonstantin Khlebnikov struct dquot *dquot = dquots[type]; 995884d179dSJan Kara 9969eb6463fSNiu Yawei if (!dquot) 9979eb6463fSNiu Yawei return; 9989eb6463fSNiu Yawei 9995bcd3b6fSKonstantin Khlebnikov dquots[type] = NULL; 10009eb6463fSNiu Yawei if (list_empty(&dquot->dq_free)) { 10019eb6463fSNiu Yawei /* 10029eb6463fSNiu Yawei * The inode still has reference to dquot so it can't be in the 10039eb6463fSNiu Yawei * free list 10049eb6463fSNiu Yawei */ 1005884d179dSJan Kara spin_lock(&dq_list_lock); 1006268157baSJan Kara list_add(&dquot->dq_free, tofree_head); 1007884d179dSJan Kara spin_unlock(&dq_list_lock); 10089eb6463fSNiu Yawei } else { 10099eb6463fSNiu Yawei /* 10109eb6463fSNiu Yawei * Dquot is already in a list to put so we won't drop the last 10119eb6463fSNiu Yawei * reference here. 10129eb6463fSNiu Yawei */ 10139eb6463fSNiu Yawei dqput(dquot); 1014884d179dSJan Kara } 1015884d179dSJan Kara } 1016884d179dSJan Kara 1017268157baSJan Kara /* 1018268157baSJan Kara * Free list of dquots 1019268157baSJan Kara * Dquots are removed from inodes and no new references can be got so we are 1020268157baSJan Kara * the only ones holding reference 1021268157baSJan Kara */ 1022884d179dSJan Kara static void put_dquot_list(struct list_head *tofree_head) 1023884d179dSJan Kara { 1024884d179dSJan Kara struct list_head *act_head; 1025884d179dSJan Kara struct dquot *dquot; 1026884d179dSJan Kara 1027884d179dSJan Kara act_head = tofree_head->next; 1028884d179dSJan Kara while (act_head != tofree_head) { 1029884d179dSJan Kara dquot = list_entry(act_head, struct dquot, dq_free); 1030884d179dSJan Kara act_head = act_head->next; 1031268157baSJan Kara /* Remove dquot from the list so we won't have problems... */ 1032268157baSJan Kara list_del_init(&dquot->dq_free); 1033884d179dSJan Kara dqput(dquot); 1034884d179dSJan Kara } 1035884d179dSJan Kara } 1036884d179dSJan Kara 1037884d179dSJan Kara static void remove_dquot_ref(struct super_block *sb, int type, 1038884d179dSJan Kara struct list_head *tofree_head) 1039884d179dSJan Kara { 1040884d179dSJan Kara struct inode *inode; 10417af9cce8SDmitry Monakhov int reserved = 0; 1042884d179dSJan Kara 104374278da9SDave Chinner spin_lock(&sb->s_inode_list_lock); 1044884d179dSJan Kara list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { 10453ae5080fSLinus Torvalds /* 10463ae5080fSLinus Torvalds * We have to scan also I_NEW inodes because they can already 10473ae5080fSLinus Torvalds * have quota pointer initialized. Luckily, we need to touch 10483ae5080fSLinus Torvalds * only quota pointers and these have separate locking 1049b9ba6f94SNiu Yawei * (dq_data_lock). 10503ae5080fSLinus Torvalds */ 1051b9ba6f94SNiu Yawei spin_lock(&dq_data_lock); 10527af9cce8SDmitry Monakhov if (!IS_NOQUOTA(inode)) { 10537af9cce8SDmitry Monakhov if (unlikely(inode_get_rsv_space(inode) > 0)) 10547af9cce8SDmitry Monakhov reserved = 1; 1055884d179dSJan Kara remove_inode_dquot_ref(inode, type, tofree_head); 1056884d179dSJan Kara } 1057b9ba6f94SNiu Yawei spin_unlock(&dq_data_lock); 10587af9cce8SDmitry Monakhov } 105974278da9SDave Chinner spin_unlock(&sb->s_inode_list_lock); 10607af9cce8SDmitry Monakhov #ifdef CONFIG_QUOTA_DEBUG 10617af9cce8SDmitry Monakhov if (reserved) { 10627af9cce8SDmitry Monakhov printk(KERN_WARNING "VFS (%s): Writes happened after quota" 10637af9cce8SDmitry Monakhov " was disabled thus quota information is probably " 10647af9cce8SDmitry Monakhov "inconsistent. Please run quotacheck(8).\n", sb->s_id); 10657af9cce8SDmitry Monakhov } 10667af9cce8SDmitry Monakhov #endif 1067884d179dSJan Kara } 1068884d179dSJan Kara 1069884d179dSJan Kara /* Gather all references from inodes and drop them */ 1070884d179dSJan Kara static void drop_dquot_ref(struct super_block *sb, int type) 1071884d179dSJan Kara { 1072884d179dSJan Kara LIST_HEAD(tofree_head); 1073884d179dSJan Kara 1074884d179dSJan Kara if (sb->dq_op) { 1075884d179dSJan Kara remove_dquot_ref(sb, type, &tofree_head); 1076b9ba6f94SNiu Yawei synchronize_srcu(&dquot_srcu); 1077884d179dSJan Kara put_dquot_list(&tofree_head); 1078884d179dSJan Kara } 1079884d179dSJan Kara } 1080884d179dSJan Kara 1081884d179dSJan Kara static inline void dquot_incr_inodes(struct dquot *dquot, qsize_t number) 1082884d179dSJan Kara { 1083884d179dSJan Kara dquot->dq_dqb.dqb_curinodes += number; 1084884d179dSJan Kara } 1085884d179dSJan Kara 1086884d179dSJan Kara static inline void dquot_incr_space(struct dquot *dquot, qsize_t number) 1087884d179dSJan Kara { 1088884d179dSJan Kara dquot->dq_dqb.dqb_curspace += number; 1089884d179dSJan Kara } 1090884d179dSJan Kara 1091884d179dSJan Kara static inline void dquot_resv_space(struct dquot *dquot, qsize_t number) 1092884d179dSJan Kara { 1093884d179dSJan Kara dquot->dq_dqb.dqb_rsvspace += number; 1094884d179dSJan Kara } 1095884d179dSJan Kara 1096884d179dSJan Kara /* 1097884d179dSJan Kara * Claim reserved quota space 1098884d179dSJan Kara */ 10990a5a9c72SJan Kara static void dquot_claim_reserved_space(struct dquot *dquot, qsize_t number) 1100884d179dSJan Kara { 11010a5a9c72SJan Kara if (dquot->dq_dqb.dqb_rsvspace < number) { 11020a5a9c72SJan Kara WARN_ON_ONCE(1); 11030a5a9c72SJan Kara number = dquot->dq_dqb.dqb_rsvspace; 11040a5a9c72SJan Kara } 1105884d179dSJan Kara dquot->dq_dqb.dqb_curspace += number; 1106884d179dSJan Kara dquot->dq_dqb.dqb_rsvspace -= number; 1107884d179dSJan Kara } 1108884d179dSJan Kara 11091c8924ebSJan Kara static void dquot_reclaim_reserved_space(struct dquot *dquot, qsize_t number) 11101c8924ebSJan Kara { 11111c8924ebSJan Kara if (WARN_ON_ONCE(dquot->dq_dqb.dqb_curspace < number)) 11121c8924ebSJan Kara number = dquot->dq_dqb.dqb_curspace; 11131c8924ebSJan Kara dquot->dq_dqb.dqb_rsvspace += number; 11141c8924ebSJan Kara dquot->dq_dqb.dqb_curspace -= number; 11151c8924ebSJan Kara } 11161c8924ebSJan Kara 1117884d179dSJan Kara static inline 1118884d179dSJan Kara void dquot_free_reserved_space(struct dquot *dquot, qsize_t number) 1119884d179dSJan Kara { 11200a5a9c72SJan Kara if (dquot->dq_dqb.dqb_rsvspace >= number) 1121884d179dSJan Kara dquot->dq_dqb.dqb_rsvspace -= number; 11220a5a9c72SJan Kara else { 11230a5a9c72SJan Kara WARN_ON_ONCE(1); 11240a5a9c72SJan Kara dquot->dq_dqb.dqb_rsvspace = 0; 11250a5a9c72SJan Kara } 1126884d179dSJan Kara } 1127884d179dSJan Kara 11287a2435d8SJan Kara static void dquot_decr_inodes(struct dquot *dquot, qsize_t number) 1129884d179dSJan Kara { 1130884d179dSJan Kara if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE || 1131884d179dSJan Kara dquot->dq_dqb.dqb_curinodes >= number) 1132884d179dSJan Kara dquot->dq_dqb.dqb_curinodes -= number; 1133884d179dSJan Kara else 1134884d179dSJan Kara dquot->dq_dqb.dqb_curinodes = 0; 1135884d179dSJan Kara if (dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit) 1136*e008bb61SArnd Bergmann dquot->dq_dqb.dqb_itime = (time64_t) 0; 1137884d179dSJan Kara clear_bit(DQ_INODES_B, &dquot->dq_flags); 1138884d179dSJan Kara } 1139884d179dSJan Kara 11407a2435d8SJan Kara static void dquot_decr_space(struct dquot *dquot, qsize_t number) 1141884d179dSJan Kara { 1142884d179dSJan Kara if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE || 1143884d179dSJan Kara dquot->dq_dqb.dqb_curspace >= number) 1144884d179dSJan Kara dquot->dq_dqb.dqb_curspace -= number; 1145884d179dSJan Kara else 1146884d179dSJan Kara dquot->dq_dqb.dqb_curspace = 0; 1147884d179dSJan Kara if (dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit) 1148*e008bb61SArnd Bergmann dquot->dq_dqb.dqb_btime = (time64_t) 0; 1149884d179dSJan Kara clear_bit(DQ_BLKS_B, &dquot->dq_flags); 1150884d179dSJan Kara } 1151884d179dSJan Kara 1152bf097aafSJan Kara struct dquot_warn { 1153bf097aafSJan Kara struct super_block *w_sb; 11547b9c7321SEric W. Biederman struct kqid w_dq_id; 1155bf097aafSJan Kara short w_type; 1156bf097aafSJan Kara }; 1157bf097aafSJan Kara 1158884d179dSJan Kara static int warning_issued(struct dquot *dquot, const int warntype) 1159884d179dSJan Kara { 1160884d179dSJan Kara int flag = (warntype == QUOTA_NL_BHARDWARN || 1161884d179dSJan Kara warntype == QUOTA_NL_BSOFTLONGWARN) ? DQ_BLKS_B : 1162884d179dSJan Kara ((warntype == QUOTA_NL_IHARDWARN || 1163884d179dSJan Kara warntype == QUOTA_NL_ISOFTLONGWARN) ? DQ_INODES_B : 0); 1164884d179dSJan Kara 1165884d179dSJan Kara if (!flag) 1166884d179dSJan Kara return 0; 1167884d179dSJan Kara return test_and_set_bit(flag, &dquot->dq_flags); 1168884d179dSJan Kara } 1169884d179dSJan Kara 1170884d179dSJan Kara #ifdef CONFIG_PRINT_QUOTA_WARNING 1171884d179dSJan Kara static int flag_print_warnings = 1; 1172884d179dSJan Kara 1173bf097aafSJan Kara static int need_print_warning(struct dquot_warn *warn) 1174884d179dSJan Kara { 1175884d179dSJan Kara if (!flag_print_warnings) 1176884d179dSJan Kara return 0; 1177884d179dSJan Kara 11787b9c7321SEric W. Biederman switch (warn->w_dq_id.type) { 1179884d179dSJan Kara case USRQUOTA: 11801a06d420SEric W. Biederman return uid_eq(current_fsuid(), warn->w_dq_id.uid); 1181884d179dSJan Kara case GRPQUOTA: 11827b9c7321SEric W. Biederman return in_group_p(warn->w_dq_id.gid); 1183847aac64SLi Xi case PRJQUOTA: 1184847aac64SLi Xi return 1; 1185884d179dSJan Kara } 1186884d179dSJan Kara return 0; 1187884d179dSJan Kara } 1188884d179dSJan Kara 1189884d179dSJan Kara /* Print warning to user which exceeded quota */ 1190bf097aafSJan Kara static void print_warning(struct dquot_warn *warn) 1191884d179dSJan Kara { 1192884d179dSJan Kara char *msg = NULL; 1193884d179dSJan Kara struct tty_struct *tty; 1194bf097aafSJan Kara int warntype = warn->w_type; 1195884d179dSJan Kara 1196884d179dSJan Kara if (warntype == QUOTA_NL_IHARDBELOW || 1197884d179dSJan Kara warntype == QUOTA_NL_ISOFTBELOW || 1198884d179dSJan Kara warntype == QUOTA_NL_BHARDBELOW || 1199bf097aafSJan Kara warntype == QUOTA_NL_BSOFTBELOW || !need_print_warning(warn)) 1200884d179dSJan Kara return; 1201884d179dSJan Kara 1202884d179dSJan Kara tty = get_current_tty(); 1203884d179dSJan Kara if (!tty) 1204884d179dSJan Kara return; 1205bf097aafSJan Kara tty_write_message(tty, warn->w_sb->s_id); 1206884d179dSJan Kara if (warntype == QUOTA_NL_ISOFTWARN || warntype == QUOTA_NL_BSOFTWARN) 1207884d179dSJan Kara tty_write_message(tty, ": warning, "); 1208884d179dSJan Kara else 1209884d179dSJan Kara tty_write_message(tty, ": write failed, "); 12107b9c7321SEric W. Biederman tty_write_message(tty, quotatypes[warn->w_dq_id.type]); 1211884d179dSJan Kara switch (warntype) { 1212884d179dSJan Kara case QUOTA_NL_IHARDWARN: 1213884d179dSJan Kara msg = " file limit reached.\r\n"; 1214884d179dSJan Kara break; 1215884d179dSJan Kara case QUOTA_NL_ISOFTLONGWARN: 1216884d179dSJan Kara msg = " file quota exceeded too long.\r\n"; 1217884d179dSJan Kara break; 1218884d179dSJan Kara case QUOTA_NL_ISOFTWARN: 1219884d179dSJan Kara msg = " file quota exceeded.\r\n"; 1220884d179dSJan Kara break; 1221884d179dSJan Kara case QUOTA_NL_BHARDWARN: 1222884d179dSJan Kara msg = " block limit reached.\r\n"; 1223884d179dSJan Kara break; 1224884d179dSJan Kara case QUOTA_NL_BSOFTLONGWARN: 1225884d179dSJan Kara msg = " block quota exceeded too long.\r\n"; 1226884d179dSJan Kara break; 1227884d179dSJan Kara case QUOTA_NL_BSOFTWARN: 1228884d179dSJan Kara msg = " block quota exceeded.\r\n"; 1229884d179dSJan Kara break; 1230884d179dSJan Kara } 1231884d179dSJan Kara tty_write_message(tty, msg); 1232884d179dSJan Kara tty_kref_put(tty); 1233884d179dSJan Kara } 1234884d179dSJan Kara #endif 1235884d179dSJan Kara 1236bf097aafSJan Kara static void prepare_warning(struct dquot_warn *warn, struct dquot *dquot, 1237bf097aafSJan Kara int warntype) 1238bf097aafSJan Kara { 1239bf097aafSJan Kara if (warning_issued(dquot, warntype)) 1240bf097aafSJan Kara return; 1241bf097aafSJan Kara warn->w_type = warntype; 1242bf097aafSJan Kara warn->w_sb = dquot->dq_sb; 1243bf097aafSJan Kara warn->w_dq_id = dquot->dq_id; 1244bf097aafSJan Kara } 1245bf097aafSJan Kara 1246884d179dSJan Kara /* 1247884d179dSJan Kara * Write warnings to the console and send warning messages over netlink. 1248884d179dSJan Kara * 1249bf097aafSJan Kara * Note that this function can call into tty and networking code. 1250884d179dSJan Kara */ 1251bf097aafSJan Kara static void flush_warnings(struct dquot_warn *warn) 1252884d179dSJan Kara { 1253884d179dSJan Kara int i; 1254884d179dSJan Kara 125586e931a3SSteven Whitehouse for (i = 0; i < MAXQUOTAS; i++) { 1256bf097aafSJan Kara if (warn[i].w_type == QUOTA_NL_NOWARN) 1257bf097aafSJan Kara continue; 1258884d179dSJan Kara #ifdef CONFIG_PRINT_QUOTA_WARNING 1259bf097aafSJan Kara print_warning(&warn[i]); 1260884d179dSJan Kara #endif 12617b9c7321SEric W. Biederman quota_send_warning(warn[i].w_dq_id, 1262bf097aafSJan Kara warn[i].w_sb->s_dev, warn[i].w_type); 1263884d179dSJan Kara } 1264884d179dSJan Kara } 1265884d179dSJan Kara 12667a2435d8SJan Kara static int ignore_hardlimit(struct dquot *dquot) 1267884d179dSJan Kara { 12684c376dcaSEric W. Biederman struct mem_dqinfo *info = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_id.type]; 1269884d179dSJan Kara 1270884d179dSJan Kara return capable(CAP_SYS_RESOURCE) && 1271268157baSJan Kara (info->dqi_format->qf_fmt_id != QFMT_VFS_OLD || 12729c45101eSJan Kara !(info->dqi_flags & DQF_ROOT_SQUASH)); 1273884d179dSJan Kara } 1274884d179dSJan Kara 1275884d179dSJan Kara /* needs dq_data_lock */ 1276bf097aafSJan Kara static int check_idq(struct dquot *dquot, qsize_t inodes, 1277bf097aafSJan Kara struct dquot_warn *warn) 1278884d179dSJan Kara { 1279268157baSJan Kara qsize_t newinodes = dquot->dq_dqb.dqb_curinodes + inodes; 1280268157baSJan Kara 12814c376dcaSEric W. Biederman if (!sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_id.type) || 1282884d179dSJan Kara test_bit(DQ_FAKE_B, &dquot->dq_flags)) 1283efd8f0e6SChristoph Hellwig return 0; 1284884d179dSJan Kara 1285884d179dSJan Kara if (dquot->dq_dqb.dqb_ihardlimit && 1286268157baSJan Kara newinodes > dquot->dq_dqb.dqb_ihardlimit && 1287884d179dSJan Kara !ignore_hardlimit(dquot)) { 1288bf097aafSJan Kara prepare_warning(warn, dquot, QUOTA_NL_IHARDWARN); 1289efd8f0e6SChristoph Hellwig return -EDQUOT; 1290884d179dSJan Kara } 1291884d179dSJan Kara 1292884d179dSJan Kara if (dquot->dq_dqb.dqb_isoftlimit && 1293268157baSJan Kara newinodes > dquot->dq_dqb.dqb_isoftlimit && 1294268157baSJan Kara dquot->dq_dqb.dqb_itime && 1295*e008bb61SArnd Bergmann ktime_get_real_seconds() >= dquot->dq_dqb.dqb_itime && 1296884d179dSJan Kara !ignore_hardlimit(dquot)) { 1297bf097aafSJan Kara prepare_warning(warn, dquot, QUOTA_NL_ISOFTLONGWARN); 1298efd8f0e6SChristoph Hellwig return -EDQUOT; 1299884d179dSJan Kara } 1300884d179dSJan Kara 1301884d179dSJan Kara if (dquot->dq_dqb.dqb_isoftlimit && 1302268157baSJan Kara newinodes > dquot->dq_dqb.dqb_isoftlimit && 1303884d179dSJan Kara dquot->dq_dqb.dqb_itime == 0) { 1304bf097aafSJan Kara prepare_warning(warn, dquot, QUOTA_NL_ISOFTWARN); 1305*e008bb61SArnd Bergmann dquot->dq_dqb.dqb_itime = ktime_get_real_seconds() + 13064c376dcaSEric W. Biederman sb_dqopt(dquot->dq_sb)->info[dquot->dq_id.type].dqi_igrace; 1307884d179dSJan Kara } 1308884d179dSJan Kara 1309efd8f0e6SChristoph Hellwig return 0; 1310884d179dSJan Kara } 1311884d179dSJan Kara 1312884d179dSJan Kara /* needs dq_data_lock */ 1313bf097aafSJan Kara static int check_bdq(struct dquot *dquot, qsize_t space, int prealloc, 1314bf097aafSJan Kara struct dquot_warn *warn) 1315884d179dSJan Kara { 1316884d179dSJan Kara qsize_t tspace; 1317268157baSJan Kara struct super_block *sb = dquot->dq_sb; 1318884d179dSJan Kara 13194c376dcaSEric W. Biederman if (!sb_has_quota_limits_enabled(sb, dquot->dq_id.type) || 1320884d179dSJan Kara test_bit(DQ_FAKE_B, &dquot->dq_flags)) 1321efd8f0e6SChristoph Hellwig return 0; 1322884d179dSJan Kara 1323884d179dSJan Kara tspace = dquot->dq_dqb.dqb_curspace + dquot->dq_dqb.dqb_rsvspace 1324884d179dSJan Kara + space; 1325884d179dSJan Kara 1326884d179dSJan Kara if (dquot->dq_dqb.dqb_bhardlimit && 1327884d179dSJan Kara tspace > dquot->dq_dqb.dqb_bhardlimit && 1328884d179dSJan Kara !ignore_hardlimit(dquot)) { 1329884d179dSJan Kara if (!prealloc) 1330bf097aafSJan Kara prepare_warning(warn, dquot, QUOTA_NL_BHARDWARN); 1331efd8f0e6SChristoph Hellwig return -EDQUOT; 1332884d179dSJan Kara } 1333884d179dSJan Kara 1334884d179dSJan Kara if (dquot->dq_dqb.dqb_bsoftlimit && 1335884d179dSJan Kara tspace > dquot->dq_dqb.dqb_bsoftlimit && 1336268157baSJan Kara dquot->dq_dqb.dqb_btime && 1337*e008bb61SArnd Bergmann ktime_get_real_seconds() >= dquot->dq_dqb.dqb_btime && 1338884d179dSJan Kara !ignore_hardlimit(dquot)) { 1339884d179dSJan Kara if (!prealloc) 1340bf097aafSJan Kara prepare_warning(warn, dquot, QUOTA_NL_BSOFTLONGWARN); 1341efd8f0e6SChristoph Hellwig return -EDQUOT; 1342884d179dSJan Kara } 1343884d179dSJan Kara 1344884d179dSJan Kara if (dquot->dq_dqb.dqb_bsoftlimit && 1345884d179dSJan Kara tspace > dquot->dq_dqb.dqb_bsoftlimit && 1346884d179dSJan Kara dquot->dq_dqb.dqb_btime == 0) { 1347884d179dSJan Kara if (!prealloc) { 1348bf097aafSJan Kara prepare_warning(warn, dquot, QUOTA_NL_BSOFTWARN); 1349*e008bb61SArnd Bergmann dquot->dq_dqb.dqb_btime = ktime_get_real_seconds() + 13504c376dcaSEric W. Biederman sb_dqopt(sb)->info[dquot->dq_id.type].dqi_bgrace; 1351884d179dSJan Kara } 1352884d179dSJan Kara else 1353884d179dSJan Kara /* 1354884d179dSJan Kara * We don't allow preallocation to exceed softlimit so exceeding will 1355884d179dSJan Kara * be always printed 1356884d179dSJan Kara */ 1357efd8f0e6SChristoph Hellwig return -EDQUOT; 1358884d179dSJan Kara } 1359884d179dSJan Kara 1360efd8f0e6SChristoph Hellwig return 0; 1361884d179dSJan Kara } 1362884d179dSJan Kara 1363884d179dSJan Kara static int info_idq_free(struct dquot *dquot, qsize_t inodes) 1364884d179dSJan Kara { 1365268157baSJan Kara qsize_t newinodes; 1366268157baSJan Kara 1367884d179dSJan Kara if (test_bit(DQ_FAKE_B, &dquot->dq_flags) || 1368884d179dSJan Kara dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit || 13694c376dcaSEric W. Biederman !sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_id.type)) 1370884d179dSJan Kara return QUOTA_NL_NOWARN; 1371884d179dSJan Kara 1372268157baSJan Kara newinodes = dquot->dq_dqb.dqb_curinodes - inodes; 1373268157baSJan Kara if (newinodes <= dquot->dq_dqb.dqb_isoftlimit) 1374884d179dSJan Kara return QUOTA_NL_ISOFTBELOW; 1375884d179dSJan Kara if (dquot->dq_dqb.dqb_curinodes >= dquot->dq_dqb.dqb_ihardlimit && 1376268157baSJan Kara newinodes < dquot->dq_dqb.dqb_ihardlimit) 1377884d179dSJan Kara return QUOTA_NL_IHARDBELOW; 1378884d179dSJan Kara return QUOTA_NL_NOWARN; 1379884d179dSJan Kara } 1380884d179dSJan Kara 1381884d179dSJan Kara static int info_bdq_free(struct dquot *dquot, qsize_t space) 1382884d179dSJan Kara { 1383884d179dSJan Kara if (test_bit(DQ_FAKE_B, &dquot->dq_flags) || 1384884d179dSJan Kara dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit) 1385884d179dSJan Kara return QUOTA_NL_NOWARN; 1386884d179dSJan Kara 1387884d179dSJan Kara if (dquot->dq_dqb.dqb_curspace - space <= dquot->dq_dqb.dqb_bsoftlimit) 1388884d179dSJan Kara return QUOTA_NL_BSOFTBELOW; 1389884d179dSJan Kara if (dquot->dq_dqb.dqb_curspace >= dquot->dq_dqb.dqb_bhardlimit && 1390884d179dSJan Kara dquot->dq_dqb.dqb_curspace - space < dquot->dq_dqb.dqb_bhardlimit) 1391884d179dSJan Kara return QUOTA_NL_BHARDBELOW; 1392884d179dSJan Kara return QUOTA_NL_NOWARN; 1393884d179dSJan Kara } 13940a5a9c72SJan Kara 1395189eef59SChristoph Hellwig static int dquot_active(const struct inode *inode) 1396189eef59SChristoph Hellwig { 1397189eef59SChristoph Hellwig struct super_block *sb = inode->i_sb; 1398189eef59SChristoph Hellwig 1399189eef59SChristoph Hellwig if (IS_NOQUOTA(inode)) 1400189eef59SChristoph Hellwig return 0; 1401189eef59SChristoph Hellwig return sb_any_quota_loaded(sb) & ~sb_any_quota_suspended(sb); 1402189eef59SChristoph Hellwig } 1403189eef59SChristoph Hellwig 1404884d179dSJan Kara /* 1405884d179dSJan Kara * Initialize quota pointers in inode 1406871a2931SChristoph Hellwig * 1407871a2931SChristoph Hellwig * It is better to call this function outside of any transaction as it 1408871a2931SChristoph Hellwig * might need a lot of space in journal for dquot structure allocation. 1409884d179dSJan Kara */ 14106184fc0bSJan Kara static int __dquot_initialize(struct inode *inode, int type) 1411884d179dSJan Kara { 14121ea06becSNiu Yawei int cnt, init_needed = 0; 1413ab73ef46SNikolay Borisov struct dquot **dquots, *got[MAXQUOTAS] = {}; 1414884d179dSJan Kara struct super_block *sb = inode->i_sb; 14150a5a9c72SJan Kara qsize_t rsv; 14166184fc0bSJan Kara int ret = 0; 1417884d179dSJan Kara 1418189eef59SChristoph Hellwig if (!dquot_active(inode)) 14196184fc0bSJan Kara return 0; 1420884d179dSJan Kara 14215bcd3b6fSKonstantin Khlebnikov dquots = i_dquot(inode); 14225bcd3b6fSKonstantin Khlebnikov 1423884d179dSJan Kara /* First get references to structures we might need. */ 1424884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1425aca645a6SEric W. Biederman struct kqid qid; 1426847aac64SLi Xi kprojid_t projid; 1427847aac64SLi Xi int rc; 14286184fc0bSJan Kara struct dquot *dquot; 1429847aac64SLi Xi 1430884d179dSJan Kara if (type != -1 && cnt != type) 1431884d179dSJan Kara continue; 14321ea06becSNiu Yawei /* 14331ea06becSNiu Yawei * The i_dquot should have been initialized in most cases, 14341ea06becSNiu Yawei * we check it without locking here to avoid unnecessary 14351ea06becSNiu Yawei * dqget()/dqput() calls. 14361ea06becSNiu Yawei */ 14375bcd3b6fSKonstantin Khlebnikov if (dquots[cnt]) 14381ea06becSNiu Yawei continue; 1439847aac64SLi Xi 1440847aac64SLi Xi if (!sb_has_quota_active(sb, cnt)) 1441847aac64SLi Xi continue; 1442847aac64SLi Xi 14431ea06becSNiu Yawei init_needed = 1; 14441ea06becSNiu Yawei 1445884d179dSJan Kara switch (cnt) { 1446884d179dSJan Kara case USRQUOTA: 1447aca645a6SEric W. Biederman qid = make_kqid_uid(inode->i_uid); 1448884d179dSJan Kara break; 1449884d179dSJan Kara case GRPQUOTA: 1450aca645a6SEric W. Biederman qid = make_kqid_gid(inode->i_gid); 1451884d179dSJan Kara break; 1452847aac64SLi Xi case PRJQUOTA: 1453847aac64SLi Xi rc = inode->i_sb->dq_op->get_projid(inode, &projid); 1454847aac64SLi Xi if (rc) 1455847aac64SLi Xi continue; 1456847aac64SLi Xi qid = make_kqid_projid(projid); 1457847aac64SLi Xi break; 1458884d179dSJan Kara } 14596184fc0bSJan Kara dquot = dqget(sb, qid); 14606184fc0bSJan Kara if (IS_ERR(dquot)) { 14616184fc0bSJan Kara /* We raced with somebody turning quotas off... */ 14626184fc0bSJan Kara if (PTR_ERR(dquot) != -ESRCH) { 14636184fc0bSJan Kara ret = PTR_ERR(dquot); 14646184fc0bSJan Kara goto out_put; 14656184fc0bSJan Kara } 14666184fc0bSJan Kara dquot = NULL; 14676184fc0bSJan Kara } 14686184fc0bSJan Kara got[cnt] = dquot; 1469884d179dSJan Kara } 1470884d179dSJan Kara 14711ea06becSNiu Yawei /* All required i_dquot has been initialized */ 14721ea06becSNiu Yawei if (!init_needed) 14736184fc0bSJan Kara return 0; 14741ea06becSNiu Yawei 1475b9ba6f94SNiu Yawei spin_lock(&dq_data_lock); 1476884d179dSJan Kara if (IS_NOQUOTA(inode)) 14776184fc0bSJan Kara goto out_lock; 1478884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1479884d179dSJan Kara if (type != -1 && cnt != type) 1480884d179dSJan Kara continue; 1481884d179dSJan Kara /* Avoid races with quotaoff() */ 1482884d179dSJan Kara if (!sb_has_quota_active(sb, cnt)) 1483884d179dSJan Kara continue; 14844408ea41SJan Kara /* We could race with quotaon or dqget() could have failed */ 14854408ea41SJan Kara if (!got[cnt]) 14864408ea41SJan Kara continue; 14875bcd3b6fSKonstantin Khlebnikov if (!dquots[cnt]) { 14885bcd3b6fSKonstantin Khlebnikov dquots[cnt] = got[cnt]; 1489dd6f3c6dSJan Kara got[cnt] = NULL; 14900a5a9c72SJan Kara /* 14910a5a9c72SJan Kara * Make quota reservation system happy if someone 14920a5a9c72SJan Kara * did a write before quota was turned on 14930a5a9c72SJan Kara */ 14940a5a9c72SJan Kara rsv = inode_get_rsv_space(inode); 1495b9ba6f94SNiu Yawei if (unlikely(rsv)) 14965bcd3b6fSKonstantin Khlebnikov dquot_resv_space(dquots[cnt], rsv); 1497884d179dSJan Kara } 1498884d179dSJan Kara } 14996184fc0bSJan Kara out_lock: 1500b9ba6f94SNiu Yawei spin_unlock(&dq_data_lock); 15016184fc0bSJan Kara out_put: 1502884d179dSJan Kara /* Drop unused references */ 1503dc52dd3aSDmitry Monakhov dqput_all(got); 15046184fc0bSJan Kara 15056184fc0bSJan Kara return ret; 1506871a2931SChristoph Hellwig } 1507871a2931SChristoph Hellwig 15086184fc0bSJan Kara int dquot_initialize(struct inode *inode) 1509871a2931SChristoph Hellwig { 15106184fc0bSJan Kara return __dquot_initialize(inode, -1); 1511884d179dSJan Kara } 1512884d179dSJan Kara EXPORT_SYMBOL(dquot_initialize); 1513884d179dSJan Kara 1514884d179dSJan Kara /* 1515b9ba6f94SNiu Yawei * Release all quotas referenced by inode. 1516b9ba6f94SNiu Yawei * 1517b9ba6f94SNiu Yawei * This function only be called on inode free or converting 1518b9ba6f94SNiu Yawei * a file to quota file, no other users for the i_dquot in 1519b9ba6f94SNiu Yawei * both cases, so we needn't call synchronize_srcu() after 1520b9ba6f94SNiu Yawei * clearing i_dquot. 1521884d179dSJan Kara */ 15229f754758SChristoph Hellwig static void __dquot_drop(struct inode *inode) 1523884d179dSJan Kara { 1524884d179dSJan Kara int cnt; 15255bcd3b6fSKonstantin Khlebnikov struct dquot **dquots = i_dquot(inode); 1526884d179dSJan Kara struct dquot *put[MAXQUOTAS]; 1527884d179dSJan Kara 1528b9ba6f94SNiu Yawei spin_lock(&dq_data_lock); 1529884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 15305bcd3b6fSKonstantin Khlebnikov put[cnt] = dquots[cnt]; 15315bcd3b6fSKonstantin Khlebnikov dquots[cnt] = NULL; 1532884d179dSJan Kara } 1533b9ba6f94SNiu Yawei spin_unlock(&dq_data_lock); 1534dc52dd3aSDmitry Monakhov dqput_all(put); 1535884d179dSJan Kara } 1536884d179dSJan Kara 15379f754758SChristoph Hellwig void dquot_drop(struct inode *inode) 1538884d179dSJan Kara { 15395bcd3b6fSKonstantin Khlebnikov struct dquot * const *dquots; 1540884d179dSJan Kara int cnt; 15419f754758SChristoph Hellwig 15429f754758SChristoph Hellwig if (IS_NOQUOTA(inode)) 15439f754758SChristoph Hellwig return; 15449f754758SChristoph Hellwig 15459f754758SChristoph Hellwig /* 15469f754758SChristoph Hellwig * Test before calling to rule out calls from proc and such 1547884d179dSJan Kara * where we are not allowed to block. Note that this is 1548884d179dSJan Kara * actually reliable test even without the lock - the caller 1549884d179dSJan Kara * must assure that nobody can come after the DQUOT_DROP and 15509f754758SChristoph Hellwig * add quota pointers back anyway. 15519f754758SChristoph Hellwig */ 15525bcd3b6fSKonstantin Khlebnikov dquots = i_dquot(inode); 15539f754758SChristoph Hellwig for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 15545bcd3b6fSKonstantin Khlebnikov if (dquots[cnt]) 1555884d179dSJan Kara break; 15569f754758SChristoph Hellwig } 15579f754758SChristoph Hellwig 1558884d179dSJan Kara if (cnt < MAXQUOTAS) 15599f754758SChristoph Hellwig __dquot_drop(inode); 1560884d179dSJan Kara } 15619f754758SChristoph Hellwig EXPORT_SYMBOL(dquot_drop); 1562884d179dSJan Kara 1563884d179dSJan Kara /* 1564fd8fbfc1SDmitry Monakhov * inode_reserved_space is managed internally by quota, and protected by 1565fd8fbfc1SDmitry Monakhov * i_lock similar to i_blocks+i_bytes. 1566fd8fbfc1SDmitry Monakhov */ 1567fd8fbfc1SDmitry Monakhov static qsize_t *inode_reserved_space(struct inode * inode) 1568fd8fbfc1SDmitry Monakhov { 1569fd8fbfc1SDmitry Monakhov /* Filesystem must explicitly define it's own method in order to use 1570fd8fbfc1SDmitry Monakhov * quota reservation interface */ 1571fd8fbfc1SDmitry Monakhov BUG_ON(!inode->i_sb->dq_op->get_reserved_space); 1572fd8fbfc1SDmitry Monakhov return inode->i_sb->dq_op->get_reserved_space(inode); 1573fd8fbfc1SDmitry Monakhov } 1574fd8fbfc1SDmitry Monakhov 1575c469070aSDmitry Monakhov void inode_add_rsv_space(struct inode *inode, qsize_t number) 1576fd8fbfc1SDmitry Monakhov { 1577fd8fbfc1SDmitry Monakhov spin_lock(&inode->i_lock); 1578fd8fbfc1SDmitry Monakhov *inode_reserved_space(inode) += number; 1579fd8fbfc1SDmitry Monakhov spin_unlock(&inode->i_lock); 1580fd8fbfc1SDmitry Monakhov } 1581c469070aSDmitry Monakhov EXPORT_SYMBOL(inode_add_rsv_space); 1582fd8fbfc1SDmitry Monakhov 1583c469070aSDmitry Monakhov void inode_claim_rsv_space(struct inode *inode, qsize_t number) 1584fd8fbfc1SDmitry Monakhov { 1585fd8fbfc1SDmitry Monakhov spin_lock(&inode->i_lock); 1586fd8fbfc1SDmitry Monakhov *inode_reserved_space(inode) -= number; 1587fd8fbfc1SDmitry Monakhov __inode_add_bytes(inode, number); 1588fd8fbfc1SDmitry Monakhov spin_unlock(&inode->i_lock); 1589fd8fbfc1SDmitry Monakhov } 1590c469070aSDmitry Monakhov EXPORT_SYMBOL(inode_claim_rsv_space); 1591fd8fbfc1SDmitry Monakhov 15921c8924ebSJan Kara void inode_reclaim_rsv_space(struct inode *inode, qsize_t number) 15931c8924ebSJan Kara { 15941c8924ebSJan Kara spin_lock(&inode->i_lock); 15951c8924ebSJan Kara *inode_reserved_space(inode) += number; 15961c8924ebSJan Kara __inode_sub_bytes(inode, number); 15971c8924ebSJan Kara spin_unlock(&inode->i_lock); 15981c8924ebSJan Kara } 15991c8924ebSJan Kara EXPORT_SYMBOL(inode_reclaim_rsv_space); 16001c8924ebSJan Kara 1601c469070aSDmitry Monakhov void inode_sub_rsv_space(struct inode *inode, qsize_t number) 1602fd8fbfc1SDmitry Monakhov { 1603fd8fbfc1SDmitry Monakhov spin_lock(&inode->i_lock); 1604fd8fbfc1SDmitry Monakhov *inode_reserved_space(inode) -= number; 1605fd8fbfc1SDmitry Monakhov spin_unlock(&inode->i_lock); 1606fd8fbfc1SDmitry Monakhov } 1607c469070aSDmitry Monakhov EXPORT_SYMBOL(inode_sub_rsv_space); 1608fd8fbfc1SDmitry Monakhov 1609fd8fbfc1SDmitry Monakhov static qsize_t inode_get_rsv_space(struct inode *inode) 1610fd8fbfc1SDmitry Monakhov { 1611fd8fbfc1SDmitry Monakhov qsize_t ret; 161205b5d898SJan Kara 161305b5d898SJan Kara if (!inode->i_sb->dq_op->get_reserved_space) 161405b5d898SJan Kara return 0; 1615fd8fbfc1SDmitry Monakhov spin_lock(&inode->i_lock); 1616fd8fbfc1SDmitry Monakhov ret = *inode_reserved_space(inode); 1617fd8fbfc1SDmitry Monakhov spin_unlock(&inode->i_lock); 1618fd8fbfc1SDmitry Monakhov return ret; 1619fd8fbfc1SDmitry Monakhov } 1620fd8fbfc1SDmitry Monakhov 1621fd8fbfc1SDmitry Monakhov static void inode_incr_space(struct inode *inode, qsize_t number, 1622fd8fbfc1SDmitry Monakhov int reserve) 1623fd8fbfc1SDmitry Monakhov { 1624fd8fbfc1SDmitry Monakhov if (reserve) 1625fd8fbfc1SDmitry Monakhov inode_add_rsv_space(inode, number); 1626fd8fbfc1SDmitry Monakhov else 1627fd8fbfc1SDmitry Monakhov inode_add_bytes(inode, number); 1628fd8fbfc1SDmitry Monakhov } 1629fd8fbfc1SDmitry Monakhov 1630fd8fbfc1SDmitry Monakhov static void inode_decr_space(struct inode *inode, qsize_t number, int reserve) 1631fd8fbfc1SDmitry Monakhov { 1632fd8fbfc1SDmitry Monakhov if (reserve) 1633fd8fbfc1SDmitry Monakhov inode_sub_rsv_space(inode, number); 1634fd8fbfc1SDmitry Monakhov else 1635fd8fbfc1SDmitry Monakhov inode_sub_bytes(inode, number); 1636fd8fbfc1SDmitry Monakhov } 1637fd8fbfc1SDmitry Monakhov 1638fd8fbfc1SDmitry Monakhov /* 16395dd4056dSChristoph Hellwig * This functions updates i_blocks+i_bytes fields and quota information 16405dd4056dSChristoph Hellwig * (together with appropriate checks). 16415dd4056dSChristoph Hellwig * 16425dd4056dSChristoph Hellwig * NOTE: We absolutely rely on the fact that caller dirties the inode 16435dd4056dSChristoph Hellwig * (usually helpers in quotaops.h care about this) and holds a handle for 16445dd4056dSChristoph Hellwig * the current transaction so that dquot write and inode write go into the 16455dd4056dSChristoph Hellwig * same transaction. 1646884d179dSJan Kara */ 1647884d179dSJan Kara 1648884d179dSJan Kara /* 1649884d179dSJan Kara * This operation can block, but only after everything is updated 1650884d179dSJan Kara */ 165156246f9aSEric Sandeen int __dquot_alloc_space(struct inode *inode, qsize_t number, int flags) 1652884d179dSJan Kara { 1653b9ba6f94SNiu Yawei int cnt, ret = 0, index; 1654bf097aafSJan Kara struct dquot_warn warn[MAXQUOTAS]; 165556246f9aSEric Sandeen int reserve = flags & DQUOT_SPACE_RESERVE; 16565bcd3b6fSKonstantin Khlebnikov struct dquot **dquots; 1657884d179dSJan Kara 1658189eef59SChristoph Hellwig if (!dquot_active(inode)) { 1659fd8fbfc1SDmitry Monakhov inode_incr_space(inode, number, reserve); 1660fd8fbfc1SDmitry Monakhov goto out; 1661fd8fbfc1SDmitry Monakhov } 1662fd8fbfc1SDmitry Monakhov 1663884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 1664bf097aafSJan Kara warn[cnt].w_type = QUOTA_NL_NOWARN; 1665884d179dSJan Kara 16665bcd3b6fSKonstantin Khlebnikov dquots = i_dquot(inode); 1667b9ba6f94SNiu Yawei index = srcu_read_lock(&dquot_srcu); 1668884d179dSJan Kara spin_lock(&dq_data_lock); 1669884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1670bf097aafSJan Kara if (!dquots[cnt]) 1671884d179dSJan Kara continue; 1672bf097aafSJan Kara ret = check_bdq(dquots[cnt], number, 1673bf097aafSJan Kara !(flags & DQUOT_SPACE_WARN), &warn[cnt]); 1674bf097aafSJan Kara if (ret && !(flags & DQUOT_SPACE_NOFAIL)) { 1675fd8fbfc1SDmitry Monakhov spin_unlock(&dq_data_lock); 1676fd8fbfc1SDmitry Monakhov goto out_flush_warn; 1677884d179dSJan Kara } 1678884d179dSJan Kara } 1679884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1680bf097aafSJan Kara if (!dquots[cnt]) 1681884d179dSJan Kara continue; 1682884d179dSJan Kara if (reserve) 1683bf097aafSJan Kara dquot_resv_space(dquots[cnt], number); 1684884d179dSJan Kara else 1685bf097aafSJan Kara dquot_incr_space(dquots[cnt], number); 1686884d179dSJan Kara } 1687fd8fbfc1SDmitry Monakhov inode_incr_space(inode, number, reserve); 1688884d179dSJan Kara spin_unlock(&dq_data_lock); 1689fd8fbfc1SDmitry Monakhov 1690fd8fbfc1SDmitry Monakhov if (reserve) 1691fd8fbfc1SDmitry Monakhov goto out_flush_warn; 1692bf097aafSJan Kara mark_all_dquot_dirty(dquots); 1693fd8fbfc1SDmitry Monakhov out_flush_warn: 1694b9ba6f94SNiu Yawei srcu_read_unlock(&dquot_srcu, index); 1695bf097aafSJan Kara flush_warnings(warn); 1696fd8fbfc1SDmitry Monakhov out: 1697884d179dSJan Kara return ret; 1698884d179dSJan Kara } 16995dd4056dSChristoph Hellwig EXPORT_SYMBOL(__dquot_alloc_space); 1700884d179dSJan Kara 1701884d179dSJan Kara /* 1702884d179dSJan Kara * This operation can block, but only after everything is updated 1703884d179dSJan Kara */ 17046bab3596SJan Kara int dquot_alloc_inode(struct inode *inode) 1705884d179dSJan Kara { 1706b9ba6f94SNiu Yawei int cnt, ret = 0, index; 1707bf097aafSJan Kara struct dquot_warn warn[MAXQUOTAS]; 17085bcd3b6fSKonstantin Khlebnikov struct dquot * const *dquots; 1709884d179dSJan Kara 1710189eef59SChristoph Hellwig if (!dquot_active(inode)) 171163936ddaSChristoph Hellwig return 0; 1712884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 1713bf097aafSJan Kara warn[cnt].w_type = QUOTA_NL_NOWARN; 1714b9ba6f94SNiu Yawei 17155bcd3b6fSKonstantin Khlebnikov dquots = i_dquot(inode); 1716b9ba6f94SNiu Yawei index = srcu_read_lock(&dquot_srcu); 1717884d179dSJan Kara spin_lock(&dq_data_lock); 1718884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1719bf097aafSJan Kara if (!dquots[cnt]) 1720884d179dSJan Kara continue; 1721bf097aafSJan Kara ret = check_idq(dquots[cnt], 1, &warn[cnt]); 1722efd8f0e6SChristoph Hellwig if (ret) 1723884d179dSJan Kara goto warn_put_all; 1724884d179dSJan Kara } 1725884d179dSJan Kara 1726884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1727bf097aafSJan Kara if (!dquots[cnt]) 1728884d179dSJan Kara continue; 1729bf097aafSJan Kara dquot_incr_inodes(dquots[cnt], 1); 1730884d179dSJan Kara } 1731efd8f0e6SChristoph Hellwig 1732884d179dSJan Kara warn_put_all: 1733884d179dSJan Kara spin_unlock(&dq_data_lock); 173463936ddaSChristoph Hellwig if (ret == 0) 1735bf097aafSJan Kara mark_all_dquot_dirty(dquots); 1736b9ba6f94SNiu Yawei srcu_read_unlock(&dquot_srcu, index); 1737bf097aafSJan Kara flush_warnings(warn); 1738884d179dSJan Kara return ret; 1739884d179dSJan Kara } 1740884d179dSJan Kara EXPORT_SYMBOL(dquot_alloc_inode); 1741884d179dSJan Kara 17425dd4056dSChristoph Hellwig /* 17435dd4056dSChristoph Hellwig * Convert in-memory reserved quotas to real consumed quotas 17445dd4056dSChristoph Hellwig */ 17455dd4056dSChristoph Hellwig int dquot_claim_space_nodirty(struct inode *inode, qsize_t number) 1746884d179dSJan Kara { 17475bcd3b6fSKonstantin Khlebnikov struct dquot **dquots; 1748b9ba6f94SNiu Yawei int cnt, index; 1749884d179dSJan Kara 1750189eef59SChristoph Hellwig if (!dquot_active(inode)) { 1751fd8fbfc1SDmitry Monakhov inode_claim_rsv_space(inode, number); 17525dd4056dSChristoph Hellwig return 0; 1753884d179dSJan Kara } 1754884d179dSJan Kara 17555bcd3b6fSKonstantin Khlebnikov dquots = i_dquot(inode); 1756b9ba6f94SNiu Yawei index = srcu_read_lock(&dquot_srcu); 1757884d179dSJan Kara spin_lock(&dq_data_lock); 1758884d179dSJan Kara /* Claim reserved quotas to allocated quotas */ 1759884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 17605bcd3b6fSKonstantin Khlebnikov if (dquots[cnt]) 17615bcd3b6fSKonstantin Khlebnikov dquot_claim_reserved_space(dquots[cnt], number); 1762884d179dSJan Kara } 1763884d179dSJan Kara /* Update inode bytes */ 1764fd8fbfc1SDmitry Monakhov inode_claim_rsv_space(inode, number); 1765884d179dSJan Kara spin_unlock(&dq_data_lock); 17665bcd3b6fSKonstantin Khlebnikov mark_all_dquot_dirty(dquots); 1767b9ba6f94SNiu Yawei srcu_read_unlock(&dquot_srcu, index); 17685dd4056dSChristoph Hellwig return 0; 1769884d179dSJan Kara } 17705dd4056dSChristoph Hellwig EXPORT_SYMBOL(dquot_claim_space_nodirty); 1771884d179dSJan Kara 1772884d179dSJan Kara /* 17731c8924ebSJan Kara * Convert allocated space back to in-memory reserved quotas 17741c8924ebSJan Kara */ 17751c8924ebSJan Kara void dquot_reclaim_space_nodirty(struct inode *inode, qsize_t number) 17761c8924ebSJan Kara { 17775bcd3b6fSKonstantin Khlebnikov struct dquot **dquots; 1778b9ba6f94SNiu Yawei int cnt, index; 17791c8924ebSJan Kara 17801c8924ebSJan Kara if (!dquot_active(inode)) { 17811c8924ebSJan Kara inode_reclaim_rsv_space(inode, number); 17821c8924ebSJan Kara return; 17831c8924ebSJan Kara } 17841c8924ebSJan Kara 17855bcd3b6fSKonstantin Khlebnikov dquots = i_dquot(inode); 1786b9ba6f94SNiu Yawei index = srcu_read_lock(&dquot_srcu); 17871c8924ebSJan Kara spin_lock(&dq_data_lock); 17881c8924ebSJan Kara /* Claim reserved quotas to allocated quotas */ 17891c8924ebSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 17905bcd3b6fSKonstantin Khlebnikov if (dquots[cnt]) 17915bcd3b6fSKonstantin Khlebnikov dquot_reclaim_reserved_space(dquots[cnt], number); 17921c8924ebSJan Kara } 17931c8924ebSJan Kara /* Update inode bytes */ 17941c8924ebSJan Kara inode_reclaim_rsv_space(inode, number); 17951c8924ebSJan Kara spin_unlock(&dq_data_lock); 17965bcd3b6fSKonstantin Khlebnikov mark_all_dquot_dirty(dquots); 1797b9ba6f94SNiu Yawei srcu_read_unlock(&dquot_srcu, index); 17981c8924ebSJan Kara return; 17991c8924ebSJan Kara } 18001c8924ebSJan Kara EXPORT_SYMBOL(dquot_reclaim_space_nodirty); 18011c8924ebSJan Kara 18021c8924ebSJan Kara /* 1803884d179dSJan Kara * This operation can block, but only after everything is updated 1804884d179dSJan Kara */ 180556246f9aSEric Sandeen void __dquot_free_space(struct inode *inode, qsize_t number, int flags) 1806884d179dSJan Kara { 1807884d179dSJan Kara unsigned int cnt; 1808bf097aafSJan Kara struct dquot_warn warn[MAXQUOTAS]; 18095bcd3b6fSKonstantin Khlebnikov struct dquot **dquots; 1810b9ba6f94SNiu Yawei int reserve = flags & DQUOT_SPACE_RESERVE, index; 1811884d179dSJan Kara 1812189eef59SChristoph Hellwig if (!dquot_active(inode)) { 1813fd8fbfc1SDmitry Monakhov inode_decr_space(inode, number, reserve); 18145dd4056dSChristoph Hellwig return; 1815884d179dSJan Kara } 1816884d179dSJan Kara 18175bcd3b6fSKonstantin Khlebnikov dquots = i_dquot(inode); 1818b9ba6f94SNiu Yawei index = srcu_read_lock(&dquot_srcu); 1819884d179dSJan Kara spin_lock(&dq_data_lock); 1820884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1821bf097aafSJan Kara int wtype; 1822bf097aafSJan Kara 1823bf097aafSJan Kara warn[cnt].w_type = QUOTA_NL_NOWARN; 1824bf097aafSJan Kara if (!dquots[cnt]) 1825884d179dSJan Kara continue; 1826bf097aafSJan Kara wtype = info_bdq_free(dquots[cnt], number); 1827bf097aafSJan Kara if (wtype != QUOTA_NL_NOWARN) 1828bf097aafSJan Kara prepare_warning(&warn[cnt], dquots[cnt], wtype); 1829fd8fbfc1SDmitry Monakhov if (reserve) 1830bf097aafSJan Kara dquot_free_reserved_space(dquots[cnt], number); 1831fd8fbfc1SDmitry Monakhov else 1832bf097aafSJan Kara dquot_decr_space(dquots[cnt], number); 1833884d179dSJan Kara } 1834fd8fbfc1SDmitry Monakhov inode_decr_space(inode, number, reserve); 1835884d179dSJan Kara spin_unlock(&dq_data_lock); 1836fd8fbfc1SDmitry Monakhov 1837fd8fbfc1SDmitry Monakhov if (reserve) 1838fd8fbfc1SDmitry Monakhov goto out_unlock; 1839bf097aafSJan Kara mark_all_dquot_dirty(dquots); 1840fd8fbfc1SDmitry Monakhov out_unlock: 1841b9ba6f94SNiu Yawei srcu_read_unlock(&dquot_srcu, index); 1842bf097aafSJan Kara flush_warnings(warn); 1843884d179dSJan Kara } 18445dd4056dSChristoph Hellwig EXPORT_SYMBOL(__dquot_free_space); 1845fd8fbfc1SDmitry Monakhov 1846fd8fbfc1SDmitry Monakhov /* 1847884d179dSJan Kara * This operation can block, but only after everything is updated 1848884d179dSJan Kara */ 18496bab3596SJan Kara void dquot_free_inode(struct inode *inode) 1850884d179dSJan Kara { 1851884d179dSJan Kara unsigned int cnt; 1852bf097aafSJan Kara struct dquot_warn warn[MAXQUOTAS]; 18535bcd3b6fSKonstantin Khlebnikov struct dquot * const *dquots; 1854b9ba6f94SNiu Yawei int index; 1855884d179dSJan Kara 1856189eef59SChristoph Hellwig if (!dquot_active(inode)) 185763936ddaSChristoph Hellwig return; 1858884d179dSJan Kara 18595bcd3b6fSKonstantin Khlebnikov dquots = i_dquot(inode); 1860b9ba6f94SNiu Yawei index = srcu_read_lock(&dquot_srcu); 1861884d179dSJan Kara spin_lock(&dq_data_lock); 1862884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1863bf097aafSJan Kara int wtype; 1864bf097aafSJan Kara 1865bf097aafSJan Kara warn[cnt].w_type = QUOTA_NL_NOWARN; 1866bf097aafSJan Kara if (!dquots[cnt]) 1867884d179dSJan Kara continue; 1868bf097aafSJan Kara wtype = info_idq_free(dquots[cnt], 1); 1869bf097aafSJan Kara if (wtype != QUOTA_NL_NOWARN) 1870bf097aafSJan Kara prepare_warning(&warn[cnt], dquots[cnt], wtype); 1871bf097aafSJan Kara dquot_decr_inodes(dquots[cnt], 1); 1872884d179dSJan Kara } 1873884d179dSJan Kara spin_unlock(&dq_data_lock); 1874bf097aafSJan Kara mark_all_dquot_dirty(dquots); 1875b9ba6f94SNiu Yawei srcu_read_unlock(&dquot_srcu, index); 1876bf097aafSJan Kara flush_warnings(warn); 1877884d179dSJan Kara } 1878884d179dSJan Kara EXPORT_SYMBOL(dquot_free_inode); 1879884d179dSJan Kara 1880884d179dSJan Kara /* 1881884d179dSJan Kara * Transfer the number of inode and blocks from one diskquota to an other. 1882bc8e5f07SJan Kara * On success, dquot references in transfer_to are consumed and references 1883bc8e5f07SJan Kara * to original dquots that need to be released are placed there. On failure, 1884bc8e5f07SJan Kara * references are kept untouched. 1885884d179dSJan Kara * 1886884d179dSJan Kara * This operation can block, but only after everything is updated 1887884d179dSJan Kara * A transaction must be started when entering this function. 1888bc8e5f07SJan Kara * 1889b9ba6f94SNiu Yawei * We are holding reference on transfer_from & transfer_to, no need to 1890b9ba6f94SNiu Yawei * protect them by srcu_read_lock(). 1891884d179dSJan Kara */ 1892bc8e5f07SJan Kara int __dquot_transfer(struct inode *inode, struct dquot **transfer_to) 1893884d179dSJan Kara { 1894884d179dSJan Kara qsize_t space, cur_space; 1895884d179dSJan Kara qsize_t rsv_space = 0; 1896bc8e5f07SJan Kara struct dquot *transfer_from[MAXQUOTAS] = {}; 1897efd8f0e6SChristoph Hellwig int cnt, ret = 0; 18989e32784bSDmitry char is_valid[MAXQUOTAS] = {}; 1899bf097aafSJan Kara struct dquot_warn warn_to[MAXQUOTAS]; 1900bf097aafSJan Kara struct dquot_warn warn_from_inodes[MAXQUOTAS]; 1901bf097aafSJan Kara struct dquot_warn warn_from_space[MAXQUOTAS]; 1902884d179dSJan Kara 1903884d179dSJan Kara if (IS_NOQUOTA(inode)) 1904efd8f0e6SChristoph Hellwig return 0; 1905884d179dSJan Kara /* Initialize the arrays */ 1906bf097aafSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1907bf097aafSJan Kara warn_to[cnt].w_type = QUOTA_NL_NOWARN; 1908bf097aafSJan Kara warn_from_inodes[cnt].w_type = QUOTA_NL_NOWARN; 1909bf097aafSJan Kara warn_from_space[cnt].w_type = QUOTA_NL_NOWARN; 1910bf097aafSJan Kara } 1911b9ba6f94SNiu Yawei 1912b9ba6f94SNiu Yawei spin_lock(&dq_data_lock); 1913884d179dSJan Kara if (IS_NOQUOTA(inode)) { /* File without quota accounting? */ 1914b9ba6f94SNiu Yawei spin_unlock(&dq_data_lock); 1915bc8e5f07SJan Kara return 0; 1916884d179dSJan Kara } 1917884d179dSJan Kara cur_space = inode_get_bytes(inode); 1918fd8fbfc1SDmitry Monakhov rsv_space = inode_get_rsv_space(inode); 1919884d179dSJan Kara space = cur_space + rsv_space; 1920884d179dSJan Kara /* Build the transfer_from list and check the limits */ 1921884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 19229e32784bSDmitry /* 19239e32784bSDmitry * Skip changes for same uid or gid or for turned off quota-type. 19249e32784bSDmitry */ 1925dd6f3c6dSJan Kara if (!transfer_to[cnt]) 1926884d179dSJan Kara continue; 19279e32784bSDmitry /* Avoid races with quotaoff() */ 19289e32784bSDmitry if (!sb_has_quota_active(inode->i_sb, cnt)) 19299e32784bSDmitry continue; 19309e32784bSDmitry is_valid[cnt] = 1; 19312d0fa467SJan Kara transfer_from[cnt] = i_dquot(inode)[cnt]; 1932bf097aafSJan Kara ret = check_idq(transfer_to[cnt], 1, &warn_to[cnt]); 1933efd8f0e6SChristoph Hellwig if (ret) 1934efd8f0e6SChristoph Hellwig goto over_quota; 1935bf097aafSJan Kara ret = check_bdq(transfer_to[cnt], space, 0, &warn_to[cnt]); 1936efd8f0e6SChristoph Hellwig if (ret) 1937884d179dSJan Kara goto over_quota; 1938884d179dSJan Kara } 1939884d179dSJan Kara 1940884d179dSJan Kara /* 1941884d179dSJan Kara * Finally perform the needed transfer from transfer_from to transfer_to 1942884d179dSJan Kara */ 1943884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 19449e32784bSDmitry if (!is_valid[cnt]) 1945884d179dSJan Kara continue; 1946884d179dSJan Kara /* Due to IO error we might not have transfer_from[] structure */ 1947884d179dSJan Kara if (transfer_from[cnt]) { 1948bf097aafSJan Kara int wtype; 1949bf097aafSJan Kara wtype = info_idq_free(transfer_from[cnt], 1); 1950bf097aafSJan Kara if (wtype != QUOTA_NL_NOWARN) 1951bf097aafSJan Kara prepare_warning(&warn_from_inodes[cnt], 1952bf097aafSJan Kara transfer_from[cnt], wtype); 1953bf097aafSJan Kara wtype = info_bdq_free(transfer_from[cnt], space); 1954bf097aafSJan Kara if (wtype != QUOTA_NL_NOWARN) 1955bf097aafSJan Kara prepare_warning(&warn_from_space[cnt], 1956bf097aafSJan Kara transfer_from[cnt], wtype); 1957884d179dSJan Kara dquot_decr_inodes(transfer_from[cnt], 1); 1958884d179dSJan Kara dquot_decr_space(transfer_from[cnt], cur_space); 1959884d179dSJan Kara dquot_free_reserved_space(transfer_from[cnt], 1960884d179dSJan Kara rsv_space); 1961884d179dSJan Kara } 1962884d179dSJan Kara 1963884d179dSJan Kara dquot_incr_inodes(transfer_to[cnt], 1); 1964884d179dSJan Kara dquot_incr_space(transfer_to[cnt], cur_space); 1965884d179dSJan Kara dquot_resv_space(transfer_to[cnt], rsv_space); 1966884d179dSJan Kara 19672d0fa467SJan Kara i_dquot(inode)[cnt] = transfer_to[cnt]; 1968884d179dSJan Kara } 1969884d179dSJan Kara spin_unlock(&dq_data_lock); 1970884d179dSJan Kara 1971dc52dd3aSDmitry Monakhov mark_all_dquot_dirty(transfer_from); 1972dc52dd3aSDmitry Monakhov mark_all_dquot_dirty(transfer_to); 1973bf097aafSJan Kara flush_warnings(warn_to); 1974bf097aafSJan Kara flush_warnings(warn_from_inodes); 1975bf097aafSJan Kara flush_warnings(warn_from_space); 1976bc8e5f07SJan Kara /* Pass back references to put */ 1977dc52dd3aSDmitry Monakhov for (cnt = 0; cnt < MAXQUOTAS; cnt++) 19789e32784bSDmitry if (is_valid[cnt]) 1979bc8e5f07SJan Kara transfer_to[cnt] = transfer_from[cnt]; 198086f3cbecSJan Kara return 0; 1981884d179dSJan Kara over_quota: 1982884d179dSJan Kara spin_unlock(&dq_data_lock); 1983bf097aafSJan Kara flush_warnings(warn_to); 198486f3cbecSJan Kara return ret; 1985884d179dSJan Kara } 1986bc8e5f07SJan Kara EXPORT_SYMBOL(__dquot_transfer); 1987884d179dSJan Kara 19888ddd69d6SDmitry Monakhov /* Wrapper for transferring ownership of an inode for uid/gid only 19898ddd69d6SDmitry Monakhov * Called from FSXXX_setattr() 19908ddd69d6SDmitry Monakhov */ 1991b43fa828SChristoph Hellwig int dquot_transfer(struct inode *inode, struct iattr *iattr) 1992884d179dSJan Kara { 1993bc8e5f07SJan Kara struct dquot *transfer_to[MAXQUOTAS] = {}; 19946184fc0bSJan Kara struct dquot *dquot; 1995bc8e5f07SJan Kara struct super_block *sb = inode->i_sb; 1996bc8e5f07SJan Kara int ret; 19978ddd69d6SDmitry Monakhov 1998189eef59SChristoph Hellwig if (!dquot_active(inode)) 1999884d179dSJan Kara return 0; 2000bc8e5f07SJan Kara 20016184fc0bSJan Kara if (iattr->ia_valid & ATTR_UID && !uid_eq(iattr->ia_uid, inode->i_uid)){ 20026184fc0bSJan Kara dquot = dqget(sb, make_kqid_uid(iattr->ia_uid)); 20036184fc0bSJan Kara if (IS_ERR(dquot)) { 20046184fc0bSJan Kara if (PTR_ERR(dquot) != -ESRCH) { 20056184fc0bSJan Kara ret = PTR_ERR(dquot); 20066184fc0bSJan Kara goto out_put; 20076184fc0bSJan Kara } 20086184fc0bSJan Kara dquot = NULL; 20096184fc0bSJan Kara } 20106184fc0bSJan Kara transfer_to[USRQUOTA] = dquot; 20116184fc0bSJan Kara } 20126184fc0bSJan Kara if (iattr->ia_valid & ATTR_GID && !gid_eq(iattr->ia_gid, inode->i_gid)){ 20136184fc0bSJan Kara dquot = dqget(sb, make_kqid_gid(iattr->ia_gid)); 20146184fc0bSJan Kara if (IS_ERR(dquot)) { 20156184fc0bSJan Kara if (PTR_ERR(dquot) != -ESRCH) { 20166184fc0bSJan Kara ret = PTR_ERR(dquot); 20176184fc0bSJan Kara goto out_put; 20186184fc0bSJan Kara } 20196184fc0bSJan Kara dquot = NULL; 20206184fc0bSJan Kara } 20216184fc0bSJan Kara transfer_to[GRPQUOTA] = dquot; 20226184fc0bSJan Kara } 2023bc8e5f07SJan Kara ret = __dquot_transfer(inode, transfer_to); 20246184fc0bSJan Kara out_put: 2025bc8e5f07SJan Kara dqput_all(transfer_to); 2026bc8e5f07SJan Kara return ret; 2027884d179dSJan Kara } 2028b43fa828SChristoph Hellwig EXPORT_SYMBOL(dquot_transfer); 2029884d179dSJan Kara 2030884d179dSJan Kara /* 2031884d179dSJan Kara * Write info of quota file to disk 2032884d179dSJan Kara */ 2033884d179dSJan Kara int dquot_commit_info(struct super_block *sb, int type) 2034884d179dSJan Kara { 2035884d179dSJan Kara int ret; 2036884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 2037884d179dSJan Kara 2038884d179dSJan Kara mutex_lock(&dqopt->dqio_mutex); 2039884d179dSJan Kara ret = dqopt->ops[type]->write_file_info(sb, type); 2040884d179dSJan Kara mutex_unlock(&dqopt->dqio_mutex); 2041884d179dSJan Kara return ret; 2042884d179dSJan Kara } 2043884d179dSJan Kara EXPORT_SYMBOL(dquot_commit_info); 2044884d179dSJan Kara 2045be6257b2SJan Kara int dquot_get_next_id(struct super_block *sb, struct kqid *qid) 2046be6257b2SJan Kara { 2047be6257b2SJan Kara struct quota_info *dqopt = sb_dqopt(sb); 2048be6257b2SJan Kara int err; 2049be6257b2SJan Kara 205017e8a893SJan Kara mutex_lock(&dqopt->dqonoff_mutex); 205117e8a893SJan Kara if (!sb_has_quota_active(sb, qid->type)) { 205217e8a893SJan Kara err = -ESRCH; 205317e8a893SJan Kara goto out; 205417e8a893SJan Kara } 205517e8a893SJan Kara if (!dqopt->ops[qid->type]->get_next_id) { 205617e8a893SJan Kara err = -ENOSYS; 205717e8a893SJan Kara goto out; 205817e8a893SJan Kara } 2059be6257b2SJan Kara mutex_lock(&dqopt->dqio_mutex); 2060be6257b2SJan Kara err = dqopt->ops[qid->type]->get_next_id(sb, qid); 2061be6257b2SJan Kara mutex_unlock(&dqopt->dqio_mutex); 206217e8a893SJan Kara out: 206317e8a893SJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 2064be6257b2SJan Kara 2065be6257b2SJan Kara return err; 2066be6257b2SJan Kara } 2067be6257b2SJan Kara EXPORT_SYMBOL(dquot_get_next_id); 2068be6257b2SJan Kara 2069884d179dSJan Kara /* 2070884d179dSJan Kara * Definitions of diskquota operations. 2071884d179dSJan Kara */ 207261e225dcSAlexey Dobriyan const struct dquot_operations dquot_operations = { 2073884d179dSJan Kara .write_dquot = dquot_commit, 2074884d179dSJan Kara .acquire_dquot = dquot_acquire, 2075884d179dSJan Kara .release_dquot = dquot_release, 2076884d179dSJan Kara .mark_dirty = dquot_mark_dquot_dirty, 2077884d179dSJan Kara .write_info = dquot_commit_info, 2078884d179dSJan Kara .alloc_dquot = dquot_alloc, 2079884d179dSJan Kara .destroy_dquot = dquot_destroy, 2080be6257b2SJan Kara .get_next_id = dquot_get_next_id, 2081884d179dSJan Kara }; 2082123e9cafSChristoph Hellwig EXPORT_SYMBOL(dquot_operations); 2083884d179dSJan Kara 2084884d179dSJan Kara /* 2085907f4554SChristoph Hellwig * Generic helper for ->open on filesystems supporting disk quotas. 2086907f4554SChristoph Hellwig */ 2087907f4554SChristoph Hellwig int dquot_file_open(struct inode *inode, struct file *file) 2088907f4554SChristoph Hellwig { 2089907f4554SChristoph Hellwig int error; 2090907f4554SChristoph Hellwig 2091907f4554SChristoph Hellwig error = generic_file_open(inode, file); 2092907f4554SChristoph Hellwig if (!error && (file->f_mode & FMODE_WRITE)) 2093871a2931SChristoph Hellwig dquot_initialize(inode); 2094907f4554SChristoph Hellwig return error; 2095907f4554SChristoph Hellwig } 2096907f4554SChristoph Hellwig EXPORT_SYMBOL(dquot_file_open); 2097907f4554SChristoph Hellwig 2098907f4554SChristoph Hellwig /* 2099884d179dSJan Kara * Turn quota off on a device. type == -1 ==> quotaoff for all types (umount) 2100884d179dSJan Kara */ 21010f0dd62fSChristoph Hellwig int dquot_disable(struct super_block *sb, int type, unsigned int flags) 2102884d179dSJan Kara { 2103884d179dSJan Kara int cnt, ret = 0; 2104884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 2105884d179dSJan Kara struct inode *toputinode[MAXQUOTAS]; 2106884d179dSJan Kara 2107884d179dSJan Kara /* Cannot turn off usage accounting without turning off limits, or 2108884d179dSJan Kara * suspend quotas and simultaneously turn quotas off. */ 2109884d179dSJan Kara if ((flags & DQUOT_USAGE_ENABLED && !(flags & DQUOT_LIMITS_ENABLED)) 2110884d179dSJan Kara || (flags & DQUOT_SUSPENDED && flags & (DQUOT_LIMITS_ENABLED | 2111884d179dSJan Kara DQUOT_USAGE_ENABLED))) 2112884d179dSJan Kara return -EINVAL; 2113884d179dSJan Kara 2114884d179dSJan Kara /* We need to serialize quota_off() for device */ 2115884d179dSJan Kara mutex_lock(&dqopt->dqonoff_mutex); 2116884d179dSJan Kara 2117884d179dSJan Kara /* 2118884d179dSJan Kara * Skip everything if there's nothing to do. We have to do this because 2119884d179dSJan Kara * sometimes we are called when fill_super() failed and calling 2120884d179dSJan Kara * sync_fs() in such cases does no good. 2121884d179dSJan Kara */ 2122884d179dSJan Kara if (!sb_any_quota_loaded(sb)) { 2123884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 2124884d179dSJan Kara return 0; 2125884d179dSJan Kara } 2126884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 2127884d179dSJan Kara toputinode[cnt] = NULL; 2128884d179dSJan Kara if (type != -1 && cnt != type) 2129884d179dSJan Kara continue; 2130884d179dSJan Kara if (!sb_has_quota_loaded(sb, cnt)) 2131884d179dSJan Kara continue; 2132884d179dSJan Kara 2133884d179dSJan Kara if (flags & DQUOT_SUSPENDED) { 2134884d179dSJan Kara spin_lock(&dq_state_lock); 2135884d179dSJan Kara dqopt->flags |= 2136884d179dSJan Kara dquot_state_flag(DQUOT_SUSPENDED, cnt); 2137884d179dSJan Kara spin_unlock(&dq_state_lock); 2138884d179dSJan Kara } else { 2139884d179dSJan Kara spin_lock(&dq_state_lock); 2140884d179dSJan Kara dqopt->flags &= ~dquot_state_flag(flags, cnt); 2141884d179dSJan Kara /* Turning off suspended quotas? */ 2142884d179dSJan Kara if (!sb_has_quota_loaded(sb, cnt) && 2143884d179dSJan Kara sb_has_quota_suspended(sb, cnt)) { 2144884d179dSJan Kara dqopt->flags &= ~dquot_state_flag( 2145884d179dSJan Kara DQUOT_SUSPENDED, cnt); 2146884d179dSJan Kara spin_unlock(&dq_state_lock); 2147884d179dSJan Kara iput(dqopt->files[cnt]); 2148884d179dSJan Kara dqopt->files[cnt] = NULL; 2149884d179dSJan Kara continue; 2150884d179dSJan Kara } 2151884d179dSJan Kara spin_unlock(&dq_state_lock); 2152884d179dSJan Kara } 2153884d179dSJan Kara 2154884d179dSJan Kara /* We still have to keep quota loaded? */ 2155884d179dSJan Kara if (sb_has_quota_loaded(sb, cnt) && !(flags & DQUOT_SUSPENDED)) 2156884d179dSJan Kara continue; 2157884d179dSJan Kara 2158884d179dSJan Kara /* Note: these are blocking operations */ 2159884d179dSJan Kara drop_dquot_ref(sb, cnt); 2160884d179dSJan Kara invalidate_dquots(sb, cnt); 2161884d179dSJan Kara /* 2162268157baSJan Kara * Now all dquots should be invalidated, all writes done so we 2163268157baSJan Kara * should be only users of the info. No locks needed. 2164884d179dSJan Kara */ 2165884d179dSJan Kara if (info_dirty(&dqopt->info[cnt])) 2166884d179dSJan Kara sb->dq_op->write_info(sb, cnt); 2167884d179dSJan Kara if (dqopt->ops[cnt]->free_file_info) 2168884d179dSJan Kara dqopt->ops[cnt]->free_file_info(sb, cnt); 2169884d179dSJan Kara put_quota_format(dqopt->info[cnt].dqi_format); 2170884d179dSJan Kara 2171884d179dSJan Kara toputinode[cnt] = dqopt->files[cnt]; 2172884d179dSJan Kara if (!sb_has_quota_loaded(sb, cnt)) 2173884d179dSJan Kara dqopt->files[cnt] = NULL; 2174884d179dSJan Kara dqopt->info[cnt].dqi_flags = 0; 2175884d179dSJan Kara dqopt->info[cnt].dqi_igrace = 0; 2176884d179dSJan Kara dqopt->info[cnt].dqi_bgrace = 0; 2177884d179dSJan Kara dqopt->ops[cnt] = NULL; 2178884d179dSJan Kara } 2179884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 2180884d179dSJan Kara 2181884d179dSJan Kara /* Skip syncing and setting flags if quota files are hidden */ 2182884d179dSJan Kara if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) 2183884d179dSJan Kara goto put_inodes; 2184884d179dSJan Kara 2185884d179dSJan Kara /* Sync the superblock so that buffers with quota data are written to 2186884d179dSJan Kara * disk (and so userspace sees correct data afterwards). */ 2187884d179dSJan Kara if (sb->s_op->sync_fs) 2188884d179dSJan Kara sb->s_op->sync_fs(sb, 1); 2189884d179dSJan Kara sync_blockdev(sb->s_bdev); 2190884d179dSJan Kara /* Now the quota files are just ordinary files and we can set the 2191884d179dSJan Kara * inode flags back. Moreover we discard the pagecache so that 2192884d179dSJan Kara * userspace sees the writes we did bypassing the pagecache. We 2193884d179dSJan Kara * must also discard the blockdev buffers so that we see the 2194884d179dSJan Kara * changes done by userspace on the next quotaon() */ 2195884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 2196884d179dSJan Kara if (toputinode[cnt]) { 2197884d179dSJan Kara mutex_lock(&dqopt->dqonoff_mutex); 2198884d179dSJan Kara /* If quota was reenabled in the meantime, we have 2199884d179dSJan Kara * nothing to do */ 2200884d179dSJan Kara if (!sb_has_quota_loaded(sb, cnt)) { 22015955102cSAl Viro inode_lock(toputinode[cnt]); 2202884d179dSJan Kara toputinode[cnt]->i_flags &= ~(S_IMMUTABLE | 2203884d179dSJan Kara S_NOATIME | S_NOQUOTA); 2204268157baSJan Kara truncate_inode_pages(&toputinode[cnt]->i_data, 2205268157baSJan Kara 0); 22065955102cSAl Viro inode_unlock(toputinode[cnt]); 220743d2932dSJan Kara mark_inode_dirty_sync(toputinode[cnt]); 2208884d179dSJan Kara } 2209884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 2210884d179dSJan Kara } 2211884d179dSJan Kara if (sb->s_bdev) 2212884d179dSJan Kara invalidate_bdev(sb->s_bdev); 2213884d179dSJan Kara put_inodes: 2214884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 2215884d179dSJan Kara if (toputinode[cnt]) { 2216884d179dSJan Kara /* On remount RO, we keep the inode pointer so that we 2217884d179dSJan Kara * can reenable quota on the subsequent remount RW. We 2218884d179dSJan Kara * have to check 'flags' variable and not use sb_has_ 2219884d179dSJan Kara * function because another quotaon / quotaoff could 2220884d179dSJan Kara * change global state before we got here. We refuse 2221884d179dSJan Kara * to suspend quotas when there is pending delete on 2222884d179dSJan Kara * the quota file... */ 2223884d179dSJan Kara if (!(flags & DQUOT_SUSPENDED)) 2224884d179dSJan Kara iput(toputinode[cnt]); 2225884d179dSJan Kara else if (!toputinode[cnt]->i_nlink) 2226884d179dSJan Kara ret = -EBUSY; 2227884d179dSJan Kara } 2228884d179dSJan Kara return ret; 2229884d179dSJan Kara } 22300f0dd62fSChristoph Hellwig EXPORT_SYMBOL(dquot_disable); 2231884d179dSJan Kara 2232287a8095SChristoph Hellwig int dquot_quota_off(struct super_block *sb, int type) 2233884d179dSJan Kara { 22340f0dd62fSChristoph Hellwig return dquot_disable(sb, type, 22350f0dd62fSChristoph Hellwig DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); 2236884d179dSJan Kara } 2237287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_quota_off); 22380f0dd62fSChristoph Hellwig 2239884d179dSJan Kara /* 2240884d179dSJan Kara * Turn quotas on on a device 2241884d179dSJan Kara */ 2242884d179dSJan Kara 2243884d179dSJan Kara /* 2244884d179dSJan Kara * Helper function to turn quotas on when we already have the inode of 2245884d179dSJan Kara * quota file and no quota information is loaded. 2246884d179dSJan Kara */ 2247884d179dSJan Kara static int vfs_load_quota_inode(struct inode *inode, int type, int format_id, 2248884d179dSJan Kara unsigned int flags) 2249884d179dSJan Kara { 2250884d179dSJan Kara struct quota_format_type *fmt = find_quota_format(format_id); 2251884d179dSJan Kara struct super_block *sb = inode->i_sb; 2252884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 2253884d179dSJan Kara int error; 2254884d179dSJan Kara int oldflags = -1; 2255884d179dSJan Kara 2256884d179dSJan Kara if (!fmt) 2257884d179dSJan Kara return -ESRCH; 2258884d179dSJan Kara if (!S_ISREG(inode->i_mode)) { 2259884d179dSJan Kara error = -EACCES; 2260884d179dSJan Kara goto out_fmt; 2261884d179dSJan Kara } 2262884d179dSJan Kara if (IS_RDONLY(inode)) { 2263884d179dSJan Kara error = -EROFS; 2264884d179dSJan Kara goto out_fmt; 2265884d179dSJan Kara } 2266847aac64SLi Xi if (!sb->s_op->quota_write || !sb->s_op->quota_read || 2267847aac64SLi Xi (type == PRJQUOTA && sb->dq_op->get_projid == NULL)) { 2268884d179dSJan Kara error = -EINVAL; 2269884d179dSJan Kara goto out_fmt; 2270884d179dSJan Kara } 2271884d179dSJan Kara /* Usage always has to be set... */ 2272884d179dSJan Kara if (!(flags & DQUOT_USAGE_ENABLED)) { 2273884d179dSJan Kara error = -EINVAL; 2274884d179dSJan Kara goto out_fmt; 2275884d179dSJan Kara } 2276884d179dSJan Kara 2277884d179dSJan Kara if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) { 2278ab94c39bSJan Kara /* As we bypass the pagecache we must now flush all the 2279ab94c39bSJan Kara * dirty data and invalidate caches so that kernel sees 2280ab94c39bSJan Kara * changes from userspace. It is not enough to just flush 2281ab94c39bSJan Kara * the quota file since if blocksize < pagesize, invalidation 2282ab94c39bSJan Kara * of the cache could fail because of other unrelated dirty 2283ab94c39bSJan Kara * data */ 2284ab94c39bSJan Kara sync_filesystem(sb); 2285884d179dSJan Kara invalidate_bdev(sb->s_bdev); 2286884d179dSJan Kara } 2287884d179dSJan Kara mutex_lock(&dqopt->dqonoff_mutex); 2288884d179dSJan Kara if (sb_has_quota_loaded(sb, type)) { 2289884d179dSJan Kara error = -EBUSY; 2290884d179dSJan Kara goto out_lock; 2291884d179dSJan Kara } 2292884d179dSJan Kara 2293884d179dSJan Kara if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) { 2294884d179dSJan Kara /* We don't want quota and atime on quota files (deadlocks 2295884d179dSJan Kara * possible) Also nobody should write to the file - we use 2296884d179dSJan Kara * special IO operations which ignore the immutable bit. */ 22975955102cSAl Viro inode_lock(inode); 2298268157baSJan Kara oldflags = inode->i_flags & (S_NOATIME | S_IMMUTABLE | 2299268157baSJan Kara S_NOQUOTA); 2300884d179dSJan Kara inode->i_flags |= S_NOQUOTA | S_NOATIME | S_IMMUTABLE; 23015955102cSAl Viro inode_unlock(inode); 230226245c94SJan Kara /* 230326245c94SJan Kara * When S_NOQUOTA is set, remove dquot references as no more 230426245c94SJan Kara * references can be added 230526245c94SJan Kara */ 23069f754758SChristoph Hellwig __dquot_drop(inode); 2307884d179dSJan Kara } 2308884d179dSJan Kara 2309884d179dSJan Kara error = -EIO; 2310884d179dSJan Kara dqopt->files[type] = igrab(inode); 2311884d179dSJan Kara if (!dqopt->files[type]) 2312884d179dSJan Kara goto out_lock; 2313884d179dSJan Kara error = -EINVAL; 2314884d179dSJan Kara if (!fmt->qf_ops->check_quota_file(sb, type)) 2315884d179dSJan Kara goto out_file_init; 2316884d179dSJan Kara 2317884d179dSJan Kara dqopt->ops[type] = fmt->qf_ops; 2318884d179dSJan Kara dqopt->info[type].dqi_format = fmt; 2319884d179dSJan Kara dqopt->info[type].dqi_fmt_id = format_id; 2320884d179dSJan Kara INIT_LIST_HEAD(&dqopt->info[type].dqi_dirty_list); 2321884d179dSJan Kara mutex_lock(&dqopt->dqio_mutex); 2322268157baSJan Kara error = dqopt->ops[type]->read_file_info(sb, type); 2323268157baSJan Kara if (error < 0) { 2324884d179dSJan Kara mutex_unlock(&dqopt->dqio_mutex); 2325884d179dSJan Kara goto out_file_init; 2326884d179dSJan Kara } 232746fe44ceSJan Kara if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) 232846fe44ceSJan Kara dqopt->info[type].dqi_flags |= DQF_SYS_FILE; 2329884d179dSJan Kara mutex_unlock(&dqopt->dqio_mutex); 2330884d179dSJan Kara spin_lock(&dq_state_lock); 2331884d179dSJan Kara dqopt->flags |= dquot_state_flag(flags, type); 2332884d179dSJan Kara spin_unlock(&dq_state_lock); 2333884d179dSJan Kara 2334884d179dSJan Kara add_dquot_ref(sb, type); 2335884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 2336884d179dSJan Kara 2337884d179dSJan Kara return 0; 2338884d179dSJan Kara 2339884d179dSJan Kara out_file_init: 2340884d179dSJan Kara dqopt->files[type] = NULL; 2341884d179dSJan Kara iput(inode); 2342884d179dSJan Kara out_lock: 2343884d179dSJan Kara if (oldflags != -1) { 23445955102cSAl Viro inode_lock(inode); 2345884d179dSJan Kara /* Set the flags back (in the case of accidental quotaon() 2346884d179dSJan Kara * on a wrong file we don't want to mess up the flags) */ 2347884d179dSJan Kara inode->i_flags &= ~(S_NOATIME | S_NOQUOTA | S_IMMUTABLE); 2348884d179dSJan Kara inode->i_flags |= oldflags; 23495955102cSAl Viro inode_unlock(inode); 2350884d179dSJan Kara } 2351d01730d7SJiaying Zhang mutex_unlock(&dqopt->dqonoff_mutex); 2352884d179dSJan Kara out_fmt: 2353884d179dSJan Kara put_quota_format(fmt); 2354884d179dSJan Kara 2355884d179dSJan Kara return error; 2356884d179dSJan Kara } 2357884d179dSJan Kara 2358884d179dSJan Kara /* Reenable quotas on remount RW */ 23590f0dd62fSChristoph Hellwig int dquot_resume(struct super_block *sb, int type) 2360884d179dSJan Kara { 2361884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 2362884d179dSJan Kara struct inode *inode; 23630f0dd62fSChristoph Hellwig int ret = 0, cnt; 2364884d179dSJan Kara unsigned int flags; 2365884d179dSJan Kara 23660f0dd62fSChristoph Hellwig for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 23670f0dd62fSChristoph Hellwig if (type != -1 && cnt != type) 23680f0dd62fSChristoph Hellwig continue; 23690f0dd62fSChristoph Hellwig 2370884d179dSJan Kara mutex_lock(&dqopt->dqonoff_mutex); 23710f0dd62fSChristoph Hellwig if (!sb_has_quota_suspended(sb, cnt)) { 2372884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 23730f0dd62fSChristoph Hellwig continue; 2374884d179dSJan Kara } 23750f0dd62fSChristoph Hellwig inode = dqopt->files[cnt]; 23760f0dd62fSChristoph Hellwig dqopt->files[cnt] = NULL; 2377884d179dSJan Kara spin_lock(&dq_state_lock); 2378884d179dSJan Kara flags = dqopt->flags & dquot_state_flag(DQUOT_USAGE_ENABLED | 23790f0dd62fSChristoph Hellwig DQUOT_LIMITS_ENABLED, 23800f0dd62fSChristoph Hellwig cnt); 23810f0dd62fSChristoph Hellwig dqopt->flags &= ~dquot_state_flag(DQUOT_STATE_FLAGS, cnt); 2382884d179dSJan Kara spin_unlock(&dq_state_lock); 2383884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 2384884d179dSJan Kara 23850f0dd62fSChristoph Hellwig flags = dquot_generic_flag(flags, cnt); 23860f0dd62fSChristoph Hellwig ret = vfs_load_quota_inode(inode, cnt, 23870f0dd62fSChristoph Hellwig dqopt->info[cnt].dqi_fmt_id, flags); 2388884d179dSJan Kara iput(inode); 23890f0dd62fSChristoph Hellwig } 2390884d179dSJan Kara 2391884d179dSJan Kara return ret; 2392884d179dSJan Kara } 23930f0dd62fSChristoph Hellwig EXPORT_SYMBOL(dquot_resume); 2394884d179dSJan Kara 2395f00c9e44SJan Kara int dquot_quota_on(struct super_block *sb, int type, int format_id, 2396884d179dSJan Kara struct path *path) 2397884d179dSJan Kara { 2398884d179dSJan Kara int error = security_quota_on(path->dentry); 2399884d179dSJan Kara if (error) 2400884d179dSJan Kara return error; 2401884d179dSJan Kara /* Quota file not on the same filesystem? */ 2402d8c9584eSAl Viro if (path->dentry->d_sb != sb) 2403884d179dSJan Kara error = -EXDEV; 2404884d179dSJan Kara else 2405dea655c2SDavid Howells error = vfs_load_quota_inode(d_inode(path->dentry), type, 2406884d179dSJan Kara format_id, DQUOT_USAGE_ENABLED | 2407884d179dSJan Kara DQUOT_LIMITS_ENABLED); 2408884d179dSJan Kara return error; 2409884d179dSJan Kara } 2410287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_quota_on); 2411884d179dSJan Kara 2412884d179dSJan Kara /* 2413884d179dSJan Kara * More powerful function for turning on quotas allowing setting 2414884d179dSJan Kara * of individual quota flags 2415884d179dSJan Kara */ 2416287a8095SChristoph Hellwig int dquot_enable(struct inode *inode, int type, int format_id, 2417884d179dSJan Kara unsigned int flags) 2418884d179dSJan Kara { 2419884d179dSJan Kara int ret = 0; 2420884d179dSJan Kara struct super_block *sb = inode->i_sb; 2421884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 2422884d179dSJan Kara 2423884d179dSJan Kara /* Just unsuspend quotas? */ 24240f0dd62fSChristoph Hellwig BUG_ON(flags & DQUOT_SUSPENDED); 24250f0dd62fSChristoph Hellwig 2426884d179dSJan Kara if (!flags) 2427884d179dSJan Kara return 0; 2428884d179dSJan Kara /* Just updating flags needed? */ 2429884d179dSJan Kara if (sb_has_quota_loaded(sb, type)) { 2430884d179dSJan Kara mutex_lock(&dqopt->dqonoff_mutex); 2431884d179dSJan Kara /* Now do a reliable test... */ 2432884d179dSJan Kara if (!sb_has_quota_loaded(sb, type)) { 2433884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 2434884d179dSJan Kara goto load_quota; 2435884d179dSJan Kara } 2436884d179dSJan Kara if (flags & DQUOT_USAGE_ENABLED && 2437884d179dSJan Kara sb_has_quota_usage_enabled(sb, type)) { 2438884d179dSJan Kara ret = -EBUSY; 2439884d179dSJan Kara goto out_lock; 2440884d179dSJan Kara } 2441884d179dSJan Kara if (flags & DQUOT_LIMITS_ENABLED && 2442884d179dSJan Kara sb_has_quota_limits_enabled(sb, type)) { 2443884d179dSJan Kara ret = -EBUSY; 2444884d179dSJan Kara goto out_lock; 2445884d179dSJan Kara } 2446884d179dSJan Kara spin_lock(&dq_state_lock); 2447884d179dSJan Kara sb_dqopt(sb)->flags |= dquot_state_flag(flags, type); 2448884d179dSJan Kara spin_unlock(&dq_state_lock); 2449884d179dSJan Kara out_lock: 2450884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 2451884d179dSJan Kara return ret; 2452884d179dSJan Kara } 2453884d179dSJan Kara 2454884d179dSJan Kara load_quota: 2455884d179dSJan Kara return vfs_load_quota_inode(inode, type, format_id, flags); 2456884d179dSJan Kara } 2457287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_enable); 2458884d179dSJan Kara 2459884d179dSJan Kara /* 2460884d179dSJan Kara * This function is used when filesystem needs to initialize quotas 2461884d179dSJan Kara * during mount time. 2462884d179dSJan Kara */ 2463287a8095SChristoph Hellwig int dquot_quota_on_mount(struct super_block *sb, char *qf_name, 2464884d179dSJan Kara int format_id, int type) 2465884d179dSJan Kara { 2466884d179dSJan Kara struct dentry *dentry; 2467884d179dSJan Kara int error; 2468884d179dSJan Kara 2469e12a4e8aSAl Viro dentry = lookup_one_len_unlocked(qf_name, sb->s_root, strlen(qf_name)); 2470884d179dSJan Kara if (IS_ERR(dentry)) 2471884d179dSJan Kara return PTR_ERR(dentry); 2472884d179dSJan Kara 2473dea655c2SDavid Howells if (d_really_is_negative(dentry)) { 2474884d179dSJan Kara error = -ENOENT; 2475884d179dSJan Kara goto out; 2476884d179dSJan Kara } 2477884d179dSJan Kara 2478884d179dSJan Kara error = security_quota_on(dentry); 2479884d179dSJan Kara if (!error) 2480dea655c2SDavid Howells error = vfs_load_quota_inode(d_inode(dentry), type, format_id, 2481884d179dSJan Kara DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); 2482884d179dSJan Kara 2483884d179dSJan Kara out: 2484884d179dSJan Kara dput(dentry); 2485884d179dSJan Kara return error; 2486884d179dSJan Kara } 2487287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_quota_on_mount); 2488884d179dSJan Kara 24893e2af67eSJan Kara static int dquot_quota_enable(struct super_block *sb, unsigned int flags) 24903e2af67eSJan Kara { 24913e2af67eSJan Kara int ret; 24923e2af67eSJan Kara int type; 24933e2af67eSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 24943e2af67eSJan Kara 24953e2af67eSJan Kara if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) 24963e2af67eSJan Kara return -ENOSYS; 24973e2af67eSJan Kara /* Accounting cannot be turned on while fs is mounted */ 24983e2af67eSJan Kara flags &= ~(FS_QUOTA_UDQ_ACCT | FS_QUOTA_GDQ_ACCT | FS_QUOTA_PDQ_ACCT); 24993e2af67eSJan Kara if (!flags) 25003e2af67eSJan Kara return -EINVAL; 25013e2af67eSJan Kara for (type = 0; type < MAXQUOTAS; type++) { 25023e2af67eSJan Kara if (!(flags & qtype_enforce_flag(type))) 25033e2af67eSJan Kara continue; 25043e2af67eSJan Kara /* Can't enforce without accounting */ 25053e2af67eSJan Kara if (!sb_has_quota_usage_enabled(sb, type)) 25063e2af67eSJan Kara return -EINVAL; 25073e2af67eSJan Kara ret = dquot_enable(dqopt->files[type], type, 25083e2af67eSJan Kara dqopt->info[type].dqi_fmt_id, 25093e2af67eSJan Kara DQUOT_LIMITS_ENABLED); 25103e2af67eSJan Kara if (ret < 0) 25113e2af67eSJan Kara goto out_err; 25123e2af67eSJan Kara } 25133e2af67eSJan Kara return 0; 25143e2af67eSJan Kara out_err: 25153e2af67eSJan Kara /* Backout enforcement enablement we already did */ 25163e2af67eSJan Kara for (type--; type >= 0; type--) { 25173e2af67eSJan Kara if (flags & qtype_enforce_flag(type)) 25183e2af67eSJan Kara dquot_disable(sb, type, DQUOT_LIMITS_ENABLED); 25193e2af67eSJan Kara } 25203e2af67eSJan Kara /* Error code translation for better compatibility with XFS */ 25213e2af67eSJan Kara if (ret == -EBUSY) 25223e2af67eSJan Kara ret = -EEXIST; 25233e2af67eSJan Kara return ret; 25243e2af67eSJan Kara } 25253e2af67eSJan Kara 25263e2af67eSJan Kara static int dquot_quota_disable(struct super_block *sb, unsigned int flags) 25273e2af67eSJan Kara { 25283e2af67eSJan Kara int ret; 25293e2af67eSJan Kara int type; 25303e2af67eSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 25313e2af67eSJan Kara 25323e2af67eSJan Kara if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) 25333e2af67eSJan Kara return -ENOSYS; 25343e2af67eSJan Kara /* 25353e2af67eSJan Kara * We don't support turning off accounting via quotactl. In principle 25363e2af67eSJan Kara * quota infrastructure can do this but filesystems don't expect 25373e2af67eSJan Kara * userspace to be able to do it. 25383e2af67eSJan Kara */ 25393e2af67eSJan Kara if (flags & 25403e2af67eSJan Kara (FS_QUOTA_UDQ_ACCT | FS_QUOTA_GDQ_ACCT | FS_QUOTA_PDQ_ACCT)) 25413e2af67eSJan Kara return -EOPNOTSUPP; 25423e2af67eSJan Kara 25433e2af67eSJan Kara /* Filter out limits not enabled */ 25443e2af67eSJan Kara for (type = 0; type < MAXQUOTAS; type++) 25453e2af67eSJan Kara if (!sb_has_quota_limits_enabled(sb, type)) 25463e2af67eSJan Kara flags &= ~qtype_enforce_flag(type); 25473e2af67eSJan Kara /* Nothing left? */ 25483e2af67eSJan Kara if (!flags) 25493e2af67eSJan Kara return -EEXIST; 25503e2af67eSJan Kara for (type = 0; type < MAXQUOTAS; type++) { 25513e2af67eSJan Kara if (flags & qtype_enforce_flag(type)) { 25523e2af67eSJan Kara ret = dquot_disable(sb, type, DQUOT_LIMITS_ENABLED); 25533e2af67eSJan Kara if (ret < 0) 25543e2af67eSJan Kara goto out_err; 25553e2af67eSJan Kara } 25563e2af67eSJan Kara } 25573e2af67eSJan Kara return 0; 25583e2af67eSJan Kara out_err: 25593e2af67eSJan Kara /* Backout enforcement disabling we already did */ 25603e2af67eSJan Kara for (type--; type >= 0; type--) { 25613e2af67eSJan Kara if (flags & qtype_enforce_flag(type)) 25623e2af67eSJan Kara dquot_enable(dqopt->files[type], type, 25633e2af67eSJan Kara dqopt->info[type].dqi_fmt_id, 25643e2af67eSJan Kara DQUOT_LIMITS_ENABLED); 25653e2af67eSJan Kara } 25663e2af67eSJan Kara return ret; 25673e2af67eSJan Kara } 25683e2af67eSJan Kara 2569884d179dSJan Kara /* Generic routine for getting common part of quota structure */ 257014bf61ffSJan Kara static void do_get_dqblk(struct dquot *dquot, struct qc_dqblk *di) 2571884d179dSJan Kara { 2572884d179dSJan Kara struct mem_dqblk *dm = &dquot->dq_dqb; 2573884d179dSJan Kara 2574b9b2dd36SChristoph Hellwig memset(di, 0, sizeof(*di)); 2575884d179dSJan Kara spin_lock(&dq_data_lock); 257614bf61ffSJan Kara di->d_spc_hardlimit = dm->dqb_bhardlimit; 257714bf61ffSJan Kara di->d_spc_softlimit = dm->dqb_bsoftlimit; 2578b9b2dd36SChristoph Hellwig di->d_ino_hardlimit = dm->dqb_ihardlimit; 2579b9b2dd36SChristoph Hellwig di->d_ino_softlimit = dm->dqb_isoftlimit; 258014bf61ffSJan Kara di->d_space = dm->dqb_curspace + dm->dqb_rsvspace; 258114bf61ffSJan Kara di->d_ino_count = dm->dqb_curinodes; 258214bf61ffSJan Kara di->d_spc_timer = dm->dqb_btime; 258314bf61ffSJan Kara di->d_ino_timer = dm->dqb_itime; 2584884d179dSJan Kara spin_unlock(&dq_data_lock); 2585884d179dSJan Kara } 2586884d179dSJan Kara 258774a8a103SEric W. Biederman int dquot_get_dqblk(struct super_block *sb, struct kqid qid, 258814bf61ffSJan Kara struct qc_dqblk *di) 2589884d179dSJan Kara { 2590884d179dSJan Kara struct dquot *dquot; 2591884d179dSJan Kara 2592aca645a6SEric W. Biederman dquot = dqget(sb, qid); 25936184fc0bSJan Kara if (IS_ERR(dquot)) 25946184fc0bSJan Kara return PTR_ERR(dquot); 2595884d179dSJan Kara do_get_dqblk(dquot, di); 2596884d179dSJan Kara dqput(dquot); 2597884d179dSJan Kara 2598884d179dSJan Kara return 0; 2599884d179dSJan Kara } 2600287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_get_dqblk); 2601884d179dSJan Kara 2602be6257b2SJan Kara int dquot_get_next_dqblk(struct super_block *sb, struct kqid *qid, 2603be6257b2SJan Kara struct qc_dqblk *di) 2604be6257b2SJan Kara { 2605be6257b2SJan Kara struct dquot *dquot; 2606be6257b2SJan Kara int err; 2607be6257b2SJan Kara 2608be6257b2SJan Kara if (!sb->dq_op->get_next_id) 2609be6257b2SJan Kara return -ENOSYS; 2610be6257b2SJan Kara err = sb->dq_op->get_next_id(sb, qid); 2611be6257b2SJan Kara if (err < 0) 2612be6257b2SJan Kara return err; 2613be6257b2SJan Kara dquot = dqget(sb, *qid); 2614be6257b2SJan Kara if (IS_ERR(dquot)) 2615be6257b2SJan Kara return PTR_ERR(dquot); 2616be6257b2SJan Kara do_get_dqblk(dquot, di); 2617be6257b2SJan Kara dqput(dquot); 2618be6257b2SJan Kara 2619be6257b2SJan Kara return 0; 2620be6257b2SJan Kara } 2621be6257b2SJan Kara EXPORT_SYMBOL(dquot_get_next_dqblk); 2622be6257b2SJan Kara 262314bf61ffSJan Kara #define VFS_QC_MASK \ 262414bf61ffSJan Kara (QC_SPACE | QC_SPC_SOFT | QC_SPC_HARD | \ 262514bf61ffSJan Kara QC_INO_COUNT | QC_INO_SOFT | QC_INO_HARD | \ 262614bf61ffSJan Kara QC_SPC_TIMER | QC_INO_TIMER) 2627c472b432SChristoph Hellwig 2628884d179dSJan Kara /* Generic routine for setting common part of quota structure */ 262914bf61ffSJan Kara static int do_set_dqblk(struct dquot *dquot, struct qc_dqblk *di) 2630884d179dSJan Kara { 2631884d179dSJan Kara struct mem_dqblk *dm = &dquot->dq_dqb; 2632884d179dSJan Kara int check_blim = 0, check_ilim = 0; 26334c376dcaSEric W. Biederman struct mem_dqinfo *dqi = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_id.type]; 2634884d179dSJan Kara 263514bf61ffSJan Kara if (di->d_fieldmask & ~VFS_QC_MASK) 2636c472b432SChristoph Hellwig return -EINVAL; 2637c472b432SChristoph Hellwig 263814bf61ffSJan Kara if (((di->d_fieldmask & QC_SPC_SOFT) && 2639b10a0819SJan Kara di->d_spc_softlimit > dqi->dqi_max_spc_limit) || 264014bf61ffSJan Kara ((di->d_fieldmask & QC_SPC_HARD) && 2641b10a0819SJan Kara di->d_spc_hardlimit > dqi->dqi_max_spc_limit) || 264214bf61ffSJan Kara ((di->d_fieldmask & QC_INO_SOFT) && 2643b10a0819SJan Kara (di->d_ino_softlimit > dqi->dqi_max_ino_limit)) || 264414bf61ffSJan Kara ((di->d_fieldmask & QC_INO_HARD) && 2645b10a0819SJan Kara (di->d_ino_hardlimit > dqi->dqi_max_ino_limit))) 2646884d179dSJan Kara return -ERANGE; 2647884d179dSJan Kara 2648884d179dSJan Kara spin_lock(&dq_data_lock); 264914bf61ffSJan Kara if (di->d_fieldmask & QC_SPACE) { 265014bf61ffSJan Kara dm->dqb_curspace = di->d_space - dm->dqb_rsvspace; 2651884d179dSJan Kara check_blim = 1; 265208261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags); 2653884d179dSJan Kara } 2654c472b432SChristoph Hellwig 265514bf61ffSJan Kara if (di->d_fieldmask & QC_SPC_SOFT) 265614bf61ffSJan Kara dm->dqb_bsoftlimit = di->d_spc_softlimit; 265714bf61ffSJan Kara if (di->d_fieldmask & QC_SPC_HARD) 265814bf61ffSJan Kara dm->dqb_bhardlimit = di->d_spc_hardlimit; 265914bf61ffSJan Kara if (di->d_fieldmask & (QC_SPC_SOFT | QC_SPC_HARD)) { 2660884d179dSJan Kara check_blim = 1; 266108261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags); 2662884d179dSJan Kara } 2663c472b432SChristoph Hellwig 266414bf61ffSJan Kara if (di->d_fieldmask & QC_INO_COUNT) { 266514bf61ffSJan Kara dm->dqb_curinodes = di->d_ino_count; 2666884d179dSJan Kara check_ilim = 1; 266708261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags); 2668884d179dSJan Kara } 2669c472b432SChristoph Hellwig 267014bf61ffSJan Kara if (di->d_fieldmask & QC_INO_SOFT) 2671c472b432SChristoph Hellwig dm->dqb_isoftlimit = di->d_ino_softlimit; 267214bf61ffSJan Kara if (di->d_fieldmask & QC_INO_HARD) 2673c472b432SChristoph Hellwig dm->dqb_ihardlimit = di->d_ino_hardlimit; 267414bf61ffSJan Kara if (di->d_fieldmask & (QC_INO_SOFT | QC_INO_HARD)) { 2675884d179dSJan Kara check_ilim = 1; 267608261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags); 2677884d179dSJan Kara } 2678c472b432SChristoph Hellwig 267914bf61ffSJan Kara if (di->d_fieldmask & QC_SPC_TIMER) { 268014bf61ffSJan Kara dm->dqb_btime = di->d_spc_timer; 2681884d179dSJan Kara check_blim = 1; 268208261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags); 2683884d179dSJan Kara } 2684c472b432SChristoph Hellwig 268514bf61ffSJan Kara if (di->d_fieldmask & QC_INO_TIMER) { 268614bf61ffSJan Kara dm->dqb_itime = di->d_ino_timer; 2687884d179dSJan Kara check_ilim = 1; 268808261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags); 2689884d179dSJan Kara } 2690884d179dSJan Kara 2691884d179dSJan Kara if (check_blim) { 2692268157baSJan Kara if (!dm->dqb_bsoftlimit || 2693268157baSJan Kara dm->dqb_curspace < dm->dqb_bsoftlimit) { 2694884d179dSJan Kara dm->dqb_btime = 0; 2695884d179dSJan Kara clear_bit(DQ_BLKS_B, &dquot->dq_flags); 269614bf61ffSJan Kara } else if (!(di->d_fieldmask & QC_SPC_TIMER)) 2697268157baSJan Kara /* Set grace only if user hasn't provided his own... */ 2698*e008bb61SArnd Bergmann dm->dqb_btime = ktime_get_real_seconds() + dqi->dqi_bgrace; 2699884d179dSJan Kara } 2700884d179dSJan Kara if (check_ilim) { 2701268157baSJan Kara if (!dm->dqb_isoftlimit || 2702268157baSJan Kara dm->dqb_curinodes < dm->dqb_isoftlimit) { 2703884d179dSJan Kara dm->dqb_itime = 0; 2704884d179dSJan Kara clear_bit(DQ_INODES_B, &dquot->dq_flags); 270514bf61ffSJan Kara } else if (!(di->d_fieldmask & QC_INO_TIMER)) 2706268157baSJan Kara /* Set grace only if user hasn't provided his own... */ 2707*e008bb61SArnd Bergmann dm->dqb_itime = ktime_get_real_seconds() + dqi->dqi_igrace; 2708884d179dSJan Kara } 2709268157baSJan Kara if (dm->dqb_bhardlimit || dm->dqb_bsoftlimit || dm->dqb_ihardlimit || 2710268157baSJan Kara dm->dqb_isoftlimit) 2711884d179dSJan Kara clear_bit(DQ_FAKE_B, &dquot->dq_flags); 2712884d179dSJan Kara else 2713884d179dSJan Kara set_bit(DQ_FAKE_B, &dquot->dq_flags); 2714884d179dSJan Kara spin_unlock(&dq_data_lock); 2715884d179dSJan Kara mark_dquot_dirty(dquot); 2716884d179dSJan Kara 2717884d179dSJan Kara return 0; 2718884d179dSJan Kara } 2719884d179dSJan Kara 272074a8a103SEric W. Biederman int dquot_set_dqblk(struct super_block *sb, struct kqid qid, 272114bf61ffSJan Kara struct qc_dqblk *di) 2722884d179dSJan Kara { 2723884d179dSJan Kara struct dquot *dquot; 2724884d179dSJan Kara int rc; 2725884d179dSJan Kara 2726aca645a6SEric W. Biederman dquot = dqget(sb, qid); 27276184fc0bSJan Kara if (IS_ERR(dquot)) { 27286184fc0bSJan Kara rc = PTR_ERR(dquot); 2729884d179dSJan Kara goto out; 2730884d179dSJan Kara } 2731884d179dSJan Kara rc = do_set_dqblk(dquot, di); 2732884d179dSJan Kara dqput(dquot); 2733884d179dSJan Kara out: 2734884d179dSJan Kara return rc; 2735884d179dSJan Kara } 2736287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_set_dqblk); 2737884d179dSJan Kara 2738884d179dSJan Kara /* Generic routine for getting common part of quota file information */ 27390a240339SJan Kara int dquot_get_state(struct super_block *sb, struct qc_state *state) 2740884d179dSJan Kara { 2741884d179dSJan Kara struct mem_dqinfo *mi; 27420a240339SJan Kara struct qc_type_state *tstate; 27430a240339SJan Kara struct quota_info *dqopt = sb_dqopt(sb); 27440a240339SJan Kara int type; 2745884d179dSJan Kara 2746884d179dSJan Kara mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); 27470a240339SJan Kara memset(state, 0, sizeof(*state)); 27480a240339SJan Kara for (type = 0; type < MAXQUOTAS; type++) { 27490a240339SJan Kara if (!sb_has_quota_active(sb, type)) 27500a240339SJan Kara continue; 27510a240339SJan Kara tstate = state->s_state + type; 2752884d179dSJan Kara mi = sb_dqopt(sb)->info + type; 27530a240339SJan Kara tstate->flags = QCI_ACCT_ENABLED; 2754884d179dSJan Kara spin_lock(&dq_data_lock); 27550a240339SJan Kara if (mi->dqi_flags & DQF_SYS_FILE) 27560a240339SJan Kara tstate->flags |= QCI_SYSFILE; 27570a240339SJan Kara if (mi->dqi_flags & DQF_ROOT_SQUASH) 27580a240339SJan Kara tstate->flags |= QCI_ROOT_SQUASH; 27590a240339SJan Kara if (sb_has_quota_limits_enabled(sb, type)) 27600a240339SJan Kara tstate->flags |= QCI_LIMITS_ENFORCED; 27610a240339SJan Kara tstate->spc_timelimit = mi->dqi_bgrace; 27620a240339SJan Kara tstate->ino_timelimit = mi->dqi_igrace; 27630a240339SJan Kara tstate->ino = dqopt->files[type]->i_ino; 27640a240339SJan Kara tstate->blocks = dqopt->files[type]->i_blocks; 27650a240339SJan Kara tstate->nextents = 1; /* We don't know... */ 2766884d179dSJan Kara spin_unlock(&dq_data_lock); 27670a240339SJan Kara } 2768884d179dSJan Kara mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); 2769884d179dSJan Kara return 0; 2770884d179dSJan Kara } 27710a240339SJan Kara EXPORT_SYMBOL(dquot_get_state); 2772884d179dSJan Kara 2773884d179dSJan Kara /* Generic routine for setting common part of quota file information */ 27745eacb2acSJan Kara int dquot_set_dqinfo(struct super_block *sb, int type, struct qc_info *ii) 2775884d179dSJan Kara { 2776884d179dSJan Kara struct mem_dqinfo *mi; 2777884d179dSJan Kara int err = 0; 2778884d179dSJan Kara 27795eacb2acSJan Kara if ((ii->i_fieldmask & QC_WARNS_MASK) || 27805eacb2acSJan Kara (ii->i_fieldmask & QC_RT_SPC_TIMER)) 27815eacb2acSJan Kara return -EINVAL; 2782884d179dSJan Kara mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); 2783884d179dSJan Kara if (!sb_has_quota_active(sb, type)) { 2784884d179dSJan Kara err = -ESRCH; 2785884d179dSJan Kara goto out; 2786884d179dSJan Kara } 2787884d179dSJan Kara mi = sb_dqopt(sb)->info + type; 27885eacb2acSJan Kara if (ii->i_fieldmask & QC_FLAGS) { 27895eacb2acSJan Kara if ((ii->i_flags & QCI_ROOT_SQUASH && 2790ca6cb091SJan Kara mi->dqi_format->qf_fmt_id != QFMT_VFS_OLD)) { 2791ca6cb091SJan Kara err = -EINVAL; 2792ca6cb091SJan Kara goto out; 2793ca6cb091SJan Kara } 2794ca6cb091SJan Kara } 2795884d179dSJan Kara spin_lock(&dq_data_lock); 27965eacb2acSJan Kara if (ii->i_fieldmask & QC_SPC_TIMER) 27975eacb2acSJan Kara mi->dqi_bgrace = ii->i_spc_timelimit; 27985eacb2acSJan Kara if (ii->i_fieldmask & QC_INO_TIMER) 27995eacb2acSJan Kara mi->dqi_igrace = ii->i_ino_timelimit; 28005eacb2acSJan Kara if (ii->i_fieldmask & QC_FLAGS) { 28015eacb2acSJan Kara if (ii->i_flags & QCI_ROOT_SQUASH) 28025eacb2acSJan Kara mi->dqi_flags |= DQF_ROOT_SQUASH; 28035eacb2acSJan Kara else 28045eacb2acSJan Kara mi->dqi_flags &= ~DQF_ROOT_SQUASH; 28055eacb2acSJan Kara } 2806884d179dSJan Kara spin_unlock(&dq_data_lock); 2807884d179dSJan Kara mark_info_dirty(sb, type); 2808884d179dSJan Kara /* Force write to disk */ 2809884d179dSJan Kara sb->dq_op->write_info(sb, type); 2810884d179dSJan Kara out: 2811884d179dSJan Kara mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); 2812884d179dSJan Kara return err; 2813884d179dSJan Kara } 2814287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_set_dqinfo); 2815884d179dSJan Kara 2816287a8095SChristoph Hellwig const struct quotactl_ops dquot_quotactl_ops = { 2817287a8095SChristoph Hellwig .quota_on = dquot_quota_on, 2818287a8095SChristoph Hellwig .quota_off = dquot_quota_off, 2819287a8095SChristoph Hellwig .quota_sync = dquot_quota_sync, 28200a240339SJan Kara .get_state = dquot_get_state, 2821287a8095SChristoph Hellwig .set_info = dquot_set_dqinfo, 2822287a8095SChristoph Hellwig .get_dqblk = dquot_get_dqblk, 2823be6257b2SJan Kara .get_nextdqblk = dquot_get_next_dqblk, 2824287a8095SChristoph Hellwig .set_dqblk = dquot_set_dqblk 2825884d179dSJan Kara }; 2826287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_quotactl_ops); 2827dde95888SDmitry Monakhov 28283e2af67eSJan Kara const struct quotactl_ops dquot_quotactl_sysfile_ops = { 28293e2af67eSJan Kara .quota_enable = dquot_quota_enable, 28303e2af67eSJan Kara .quota_disable = dquot_quota_disable, 28313e2af67eSJan Kara .quota_sync = dquot_quota_sync, 28320a240339SJan Kara .get_state = dquot_get_state, 28333e2af67eSJan Kara .set_info = dquot_set_dqinfo, 28343e2af67eSJan Kara .get_dqblk = dquot_get_dqblk, 2835be6257b2SJan Kara .get_nextdqblk = dquot_get_next_dqblk, 28363e2af67eSJan Kara .set_dqblk = dquot_set_dqblk 28373e2af67eSJan Kara }; 28383e2af67eSJan Kara EXPORT_SYMBOL(dquot_quotactl_sysfile_ops); 28393e2af67eSJan Kara 2840dde95888SDmitry Monakhov static int do_proc_dqstats(struct ctl_table *table, int write, 2841dde95888SDmitry Monakhov void __user *buffer, size_t *lenp, loff_t *ppos) 2842dde95888SDmitry Monakhov { 2843dde95888SDmitry Monakhov unsigned int type = (int *)table->data - dqstats.stat; 2844f32764bdSDmitry Monakhov 2845f32764bdSDmitry Monakhov /* Update global table */ 2846f32764bdSDmitry Monakhov dqstats.stat[type] = 2847f32764bdSDmitry Monakhov percpu_counter_sum_positive(&dqstats.counter[type]); 2848dde95888SDmitry Monakhov return proc_dointvec(table, write, buffer, lenp, ppos); 2849dde95888SDmitry Monakhov } 2850dde95888SDmitry Monakhov 2851e628753bSJoe Perches static struct ctl_table fs_dqstats_table[] = { 2852884d179dSJan Kara { 2853884d179dSJan Kara .procname = "lookups", 2854dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_LOOKUPS], 2855884d179dSJan Kara .maxlen = sizeof(int), 2856884d179dSJan Kara .mode = 0444, 2857dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2858884d179dSJan Kara }, 2859884d179dSJan Kara { 2860884d179dSJan Kara .procname = "drops", 2861dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_DROPS], 2862884d179dSJan Kara .maxlen = sizeof(int), 2863884d179dSJan Kara .mode = 0444, 2864dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2865884d179dSJan Kara }, 2866884d179dSJan Kara { 2867884d179dSJan Kara .procname = "reads", 2868dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_READS], 2869884d179dSJan Kara .maxlen = sizeof(int), 2870884d179dSJan Kara .mode = 0444, 2871dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2872884d179dSJan Kara }, 2873884d179dSJan Kara { 2874884d179dSJan Kara .procname = "writes", 2875dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_WRITES], 2876884d179dSJan Kara .maxlen = sizeof(int), 2877884d179dSJan Kara .mode = 0444, 2878dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2879884d179dSJan Kara }, 2880884d179dSJan Kara { 2881884d179dSJan Kara .procname = "cache_hits", 2882dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_CACHE_HITS], 2883884d179dSJan Kara .maxlen = sizeof(int), 2884884d179dSJan Kara .mode = 0444, 2885dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2886884d179dSJan Kara }, 2887884d179dSJan Kara { 2888884d179dSJan Kara .procname = "allocated_dquots", 2889dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_ALLOC_DQUOTS], 2890884d179dSJan Kara .maxlen = sizeof(int), 2891884d179dSJan Kara .mode = 0444, 2892dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2893884d179dSJan Kara }, 2894884d179dSJan Kara { 2895884d179dSJan Kara .procname = "free_dquots", 2896dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_FREE_DQUOTS], 2897884d179dSJan Kara .maxlen = sizeof(int), 2898884d179dSJan Kara .mode = 0444, 2899dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2900884d179dSJan Kara }, 2901884d179dSJan Kara { 2902884d179dSJan Kara .procname = "syncs", 2903dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_SYNCS], 2904884d179dSJan Kara .maxlen = sizeof(int), 2905884d179dSJan Kara .mode = 0444, 2906dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2907884d179dSJan Kara }, 2908884d179dSJan Kara #ifdef CONFIG_PRINT_QUOTA_WARNING 2909884d179dSJan Kara { 2910884d179dSJan Kara .procname = "warnings", 2911884d179dSJan Kara .data = &flag_print_warnings, 2912884d179dSJan Kara .maxlen = sizeof(int), 2913884d179dSJan Kara .mode = 0644, 29146d456111SEric W. Biederman .proc_handler = proc_dointvec, 2915884d179dSJan Kara }, 2916884d179dSJan Kara #endif 2917ab09203eSEric W. Biederman { }, 2918884d179dSJan Kara }; 2919884d179dSJan Kara 2920e628753bSJoe Perches static struct ctl_table fs_table[] = { 2921884d179dSJan Kara { 2922884d179dSJan Kara .procname = "quota", 2923884d179dSJan Kara .mode = 0555, 2924884d179dSJan Kara .child = fs_dqstats_table, 2925884d179dSJan Kara }, 2926ab09203eSEric W. Biederman { }, 2927884d179dSJan Kara }; 2928884d179dSJan Kara 2929e628753bSJoe Perches static struct ctl_table sys_table[] = { 2930884d179dSJan Kara { 2931884d179dSJan Kara .procname = "fs", 2932884d179dSJan Kara .mode = 0555, 2933884d179dSJan Kara .child = fs_table, 2934884d179dSJan Kara }, 2935ab09203eSEric W. Biederman { }, 2936884d179dSJan Kara }; 2937884d179dSJan Kara 2938884d179dSJan Kara static int __init dquot_init(void) 2939884d179dSJan Kara { 2940f32764bdSDmitry Monakhov int i, ret; 2941884d179dSJan Kara unsigned long nr_hash, order; 2942884d179dSJan Kara 2943884d179dSJan Kara printk(KERN_NOTICE "VFS: Disk quotas %s\n", __DQUOT_VERSION__); 2944884d179dSJan Kara 2945884d179dSJan Kara register_sysctl_table(sys_table); 2946884d179dSJan Kara 2947884d179dSJan Kara dquot_cachep = kmem_cache_create("dquot", 2948884d179dSJan Kara sizeof(struct dquot), sizeof(unsigned long) * 4, 2949884d179dSJan Kara (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| 2950884d179dSJan Kara SLAB_MEM_SPREAD|SLAB_PANIC), 2951884d179dSJan Kara NULL); 2952884d179dSJan Kara 2953884d179dSJan Kara order = 0; 2954884d179dSJan Kara dquot_hash = (struct hlist_head *)__get_free_pages(GFP_ATOMIC, order); 2955884d179dSJan Kara if (!dquot_hash) 2956884d179dSJan Kara panic("Cannot create dquot hash table"); 2957884d179dSJan Kara 2958f32764bdSDmitry Monakhov for (i = 0; i < _DQST_DQSTAT_LAST; i++) { 2959908c7f19STejun Heo ret = percpu_counter_init(&dqstats.counter[i], 0, GFP_KERNEL); 2960f32764bdSDmitry Monakhov if (ret) 2961f32764bdSDmitry Monakhov panic("Cannot create dquot stat counters"); 2962f32764bdSDmitry Monakhov } 2963dde95888SDmitry Monakhov 2964884d179dSJan Kara /* Find power-of-two hlist_heads which can fit into allocation */ 2965884d179dSJan Kara nr_hash = (1UL << order) * PAGE_SIZE / sizeof(struct hlist_head); 2966884d179dSJan Kara dq_hash_bits = 0; 2967884d179dSJan Kara do { 2968884d179dSJan Kara dq_hash_bits++; 2969884d179dSJan Kara } while (nr_hash >> dq_hash_bits); 2970884d179dSJan Kara dq_hash_bits--; 2971884d179dSJan Kara 2972884d179dSJan Kara nr_hash = 1UL << dq_hash_bits; 2973884d179dSJan Kara dq_hash_mask = nr_hash - 1; 2974884d179dSJan Kara for (i = 0; i < nr_hash; i++) 2975884d179dSJan Kara INIT_HLIST_HEAD(dquot_hash + i); 2976884d179dSJan Kara 297719858e7bSAnton Blanchard pr_info("VFS: Dquot-cache hash table entries: %ld (order %ld," 297819858e7bSAnton Blanchard " %ld bytes)\n", nr_hash, order, (PAGE_SIZE << order)); 2979884d179dSJan Kara 2980884d179dSJan Kara register_shrinker(&dqcache_shrinker); 2981884d179dSJan Kara 2982884d179dSJan Kara return 0; 2983884d179dSJan Kara } 2984331221faSPaul Gortmaker fs_initcall(dquot_init); 2985