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); 250871a2931SChristoph Hellwig static void __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; 414884d179dSJan Kara set_bit(DQ_READ_B, &dquot->dq_flags); 415884d179dSJan Kara /* Instantiate dquot if needed */ 416884d179dSJan Kara if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && !dquot->dq_off) { 4174c376dcaSEric W. Biederman ret = dqopt->ops[dquot->dq_id.type]->commit_dqblk(dquot); 418884d179dSJan Kara /* Write the info if needed */ 4194c376dcaSEric W. Biederman if (info_dirty(&dqopt->info[dquot->dq_id.type])) { 4204c376dcaSEric W. Biederman ret2 = dqopt->ops[dquot->dq_id.type]->write_file_info( 4214c376dcaSEric W. Biederman dquot->dq_sb, dquot->dq_id.type); 422268157baSJan Kara } 423884d179dSJan Kara if (ret < 0) 424884d179dSJan Kara goto out_iolock; 425884d179dSJan Kara if (ret2 < 0) { 426884d179dSJan Kara ret = ret2; 427884d179dSJan Kara goto out_iolock; 428884d179dSJan Kara } 429884d179dSJan Kara } 430884d179dSJan Kara set_bit(DQ_ACTIVE_B, &dquot->dq_flags); 431884d179dSJan Kara out_iolock: 432884d179dSJan Kara mutex_unlock(&dqopt->dqio_mutex); 433884d179dSJan Kara mutex_unlock(&dquot->dq_lock); 434884d179dSJan Kara return ret; 435884d179dSJan Kara } 436884d179dSJan Kara EXPORT_SYMBOL(dquot_acquire); 437884d179dSJan Kara 438884d179dSJan Kara /* 439884d179dSJan Kara * Write dquot to disk 440884d179dSJan Kara */ 441884d179dSJan Kara int dquot_commit(struct dquot *dquot) 442884d179dSJan Kara { 443b03f2456SJan Kara int ret = 0; 444884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); 445884d179dSJan Kara 446884d179dSJan Kara mutex_lock(&dqopt->dqio_mutex); 447884d179dSJan Kara spin_lock(&dq_list_lock); 448884d179dSJan Kara if (!clear_dquot_dirty(dquot)) { 449884d179dSJan Kara spin_unlock(&dq_list_lock); 450884d179dSJan Kara goto out_sem; 451884d179dSJan Kara } 452884d179dSJan Kara spin_unlock(&dq_list_lock); 453884d179dSJan Kara /* Inactive dquot can be only if there was error during read/init 454884d179dSJan Kara * => we have better not writing it */ 455b03f2456SJan Kara if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) 4564c376dcaSEric W. Biederman ret = dqopt->ops[dquot->dq_id.type]->commit_dqblk(dquot); 457b03f2456SJan Kara else 458b03f2456SJan Kara ret = -EIO; 459884d179dSJan Kara out_sem: 460884d179dSJan Kara mutex_unlock(&dqopt->dqio_mutex); 461884d179dSJan Kara return ret; 462884d179dSJan Kara } 463884d179dSJan Kara EXPORT_SYMBOL(dquot_commit); 464884d179dSJan Kara 465884d179dSJan Kara /* 466884d179dSJan Kara * Release dquot 467884d179dSJan Kara */ 468884d179dSJan Kara int dquot_release(struct dquot *dquot) 469884d179dSJan Kara { 470884d179dSJan Kara int ret = 0, ret2 = 0; 471884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); 472884d179dSJan Kara 473884d179dSJan Kara mutex_lock(&dquot->dq_lock); 474884d179dSJan Kara /* Check whether we are not racing with some other dqget() */ 475884d179dSJan Kara if (atomic_read(&dquot->dq_count) > 1) 476884d179dSJan Kara goto out_dqlock; 477884d179dSJan Kara mutex_lock(&dqopt->dqio_mutex); 4784c376dcaSEric W. Biederman if (dqopt->ops[dquot->dq_id.type]->release_dqblk) { 4794c376dcaSEric W. Biederman ret = dqopt->ops[dquot->dq_id.type]->release_dqblk(dquot); 480884d179dSJan Kara /* Write the info */ 4814c376dcaSEric W. Biederman if (info_dirty(&dqopt->info[dquot->dq_id.type])) { 4824c376dcaSEric W. Biederman ret2 = dqopt->ops[dquot->dq_id.type]->write_file_info( 4834c376dcaSEric W. Biederman dquot->dq_sb, dquot->dq_id.type); 484268157baSJan Kara } 485884d179dSJan Kara if (ret >= 0) 486884d179dSJan Kara ret = ret2; 487884d179dSJan Kara } 488884d179dSJan Kara clear_bit(DQ_ACTIVE_B, &dquot->dq_flags); 489884d179dSJan Kara mutex_unlock(&dqopt->dqio_mutex); 490884d179dSJan Kara out_dqlock: 491884d179dSJan Kara mutex_unlock(&dquot->dq_lock); 492884d179dSJan Kara return ret; 493884d179dSJan Kara } 494884d179dSJan Kara EXPORT_SYMBOL(dquot_release); 495884d179dSJan Kara 496884d179dSJan Kara void dquot_destroy(struct dquot *dquot) 497884d179dSJan Kara { 498884d179dSJan Kara kmem_cache_free(dquot_cachep, dquot); 499884d179dSJan Kara } 500884d179dSJan Kara EXPORT_SYMBOL(dquot_destroy); 501884d179dSJan Kara 502884d179dSJan Kara static inline void do_destroy_dquot(struct dquot *dquot) 503884d179dSJan Kara { 504884d179dSJan Kara dquot->dq_sb->dq_op->destroy_dquot(dquot); 505884d179dSJan Kara } 506884d179dSJan Kara 507884d179dSJan Kara /* Invalidate all dquots on the list. Note that this function is called after 508884d179dSJan Kara * quota is disabled and pointers from inodes removed so there cannot be new 509884d179dSJan Kara * quota users. There can still be some users of quotas due to inodes being 510884d179dSJan Kara * just deleted or pruned by prune_icache() (those are not attached to any 511884d179dSJan Kara * list) or parallel quotactl call. We have to wait for such users. 512884d179dSJan Kara */ 513884d179dSJan Kara static void invalidate_dquots(struct super_block *sb, int type) 514884d179dSJan Kara { 515884d179dSJan Kara struct dquot *dquot, *tmp; 516884d179dSJan Kara 517884d179dSJan Kara restart: 518884d179dSJan Kara spin_lock(&dq_list_lock); 519884d179dSJan Kara list_for_each_entry_safe(dquot, tmp, &inuse_list, dq_inuse) { 520884d179dSJan Kara if (dquot->dq_sb != sb) 521884d179dSJan Kara continue; 5224c376dcaSEric W. Biederman if (dquot->dq_id.type != type) 523884d179dSJan Kara continue; 524884d179dSJan Kara /* Wait for dquot users */ 525884d179dSJan Kara if (atomic_read(&dquot->dq_count)) { 526884d179dSJan Kara DEFINE_WAIT(wait); 527884d179dSJan Kara 5289f985cb6SJan Kara dqgrab(dquot); 529884d179dSJan Kara prepare_to_wait(&dquot->dq_wait_unused, &wait, 530884d179dSJan Kara TASK_UNINTERRUPTIBLE); 531884d179dSJan Kara spin_unlock(&dq_list_lock); 532884d179dSJan Kara /* Once dqput() wakes us up, we know it's time to free 533884d179dSJan Kara * the dquot. 534884d179dSJan Kara * IMPORTANT: we rely on the fact that there is always 535884d179dSJan Kara * at most one process waiting for dquot to free. 536884d179dSJan Kara * Otherwise dq_count would be > 1 and we would never 537884d179dSJan Kara * wake up. 538884d179dSJan Kara */ 539884d179dSJan Kara if (atomic_read(&dquot->dq_count) > 1) 540884d179dSJan Kara schedule(); 541884d179dSJan Kara finish_wait(&dquot->dq_wait_unused, &wait); 542884d179dSJan Kara dqput(dquot); 543884d179dSJan Kara /* At this moment dquot() need not exist (it could be 544884d179dSJan Kara * reclaimed by prune_dqcache(). Hence we must 545884d179dSJan Kara * restart. */ 546884d179dSJan Kara goto restart; 547884d179dSJan Kara } 548884d179dSJan Kara /* 549884d179dSJan Kara * Quota now has no users and it has been written on last 550884d179dSJan Kara * dqput() 551884d179dSJan Kara */ 552884d179dSJan Kara remove_dquot_hash(dquot); 553884d179dSJan Kara remove_free_dquot(dquot); 554884d179dSJan Kara remove_inuse(dquot); 555884d179dSJan Kara do_destroy_dquot(dquot); 556884d179dSJan Kara } 557884d179dSJan Kara spin_unlock(&dq_list_lock); 558884d179dSJan Kara } 559884d179dSJan Kara 560884d179dSJan Kara /* Call callback for every active dquot on given filesystem */ 561884d179dSJan Kara int dquot_scan_active(struct super_block *sb, 562884d179dSJan Kara int (*fn)(struct dquot *dquot, unsigned long priv), 563884d179dSJan Kara unsigned long priv) 564884d179dSJan Kara { 565884d179dSJan Kara struct dquot *dquot, *old_dquot = NULL; 566884d179dSJan Kara int ret = 0; 567884d179dSJan Kara 568884d179dSJan Kara mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); 569884d179dSJan Kara spin_lock(&dq_list_lock); 570884d179dSJan Kara list_for_each_entry(dquot, &inuse_list, dq_inuse) { 571884d179dSJan Kara if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) 572884d179dSJan Kara continue; 573884d179dSJan Kara if (dquot->dq_sb != sb) 574884d179dSJan Kara continue; 575884d179dSJan Kara /* Now we have active dquot so we can just increase use count */ 576884d179dSJan Kara atomic_inc(&dquot->dq_count); 577884d179dSJan Kara spin_unlock(&dq_list_lock); 578dde95888SDmitry Monakhov dqstats_inc(DQST_LOOKUPS); 579884d179dSJan Kara dqput(old_dquot); 580884d179dSJan Kara old_dquot = dquot; 5811362f4eaSJan Kara /* 5821362f4eaSJan Kara * ->release_dquot() can be racing with us. Our reference 5831362f4eaSJan Kara * protects us from new calls to it so just wait for any 5841362f4eaSJan Kara * outstanding call and recheck the DQ_ACTIVE_B after that. 5851362f4eaSJan Kara */ 5861362f4eaSJan Kara wait_on_dquot(dquot); 5871362f4eaSJan Kara if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { 588884d179dSJan Kara ret = fn(dquot, priv); 589884d179dSJan Kara if (ret < 0) 590884d179dSJan Kara goto out; 5911362f4eaSJan Kara } 592884d179dSJan Kara spin_lock(&dq_list_lock); 593884d179dSJan Kara /* We are safe to continue now because our dquot could not 594884d179dSJan Kara * be moved out of the inuse list while we hold the reference */ 595884d179dSJan Kara } 596884d179dSJan Kara spin_unlock(&dq_list_lock); 597884d179dSJan Kara out: 598884d179dSJan Kara dqput(old_dquot); 599884d179dSJan Kara mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); 600884d179dSJan Kara return ret; 601884d179dSJan Kara } 602884d179dSJan Kara EXPORT_SYMBOL(dquot_scan_active); 603884d179dSJan Kara 604ceed1723SJan Kara /* Write all dquot structures to quota files */ 605ceed1723SJan Kara int dquot_writeback_dquots(struct super_block *sb, int type) 606884d179dSJan Kara { 607884d179dSJan Kara struct list_head *dirty; 608884d179dSJan Kara struct dquot *dquot; 609884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 610884d179dSJan Kara int cnt; 611ceed1723SJan Kara int err, ret = 0; 612884d179dSJan Kara 613884d179dSJan Kara mutex_lock(&dqopt->dqonoff_mutex); 614884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 615884d179dSJan Kara if (type != -1 && cnt != type) 616884d179dSJan Kara continue; 617884d179dSJan Kara if (!sb_has_quota_active(sb, cnt)) 618884d179dSJan Kara continue; 619884d179dSJan Kara spin_lock(&dq_list_lock); 620884d179dSJan Kara dirty = &dqopt->info[cnt].dqi_dirty_list; 621884d179dSJan Kara while (!list_empty(dirty)) { 622268157baSJan Kara dquot = list_first_entry(dirty, struct dquot, 623268157baSJan Kara dq_dirty); 624884d179dSJan Kara /* Dirty and inactive can be only bad dquot... */ 625884d179dSJan Kara if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { 626884d179dSJan Kara clear_dquot_dirty(dquot); 627884d179dSJan Kara continue; 628884d179dSJan Kara } 629884d179dSJan Kara /* Now we have active dquot from which someone is 630884d179dSJan Kara * holding reference so we can safely just increase 631884d179dSJan Kara * use count */ 6329f985cb6SJan Kara dqgrab(dquot); 633884d179dSJan Kara spin_unlock(&dq_list_lock); 634dde95888SDmitry Monakhov dqstats_inc(DQST_LOOKUPS); 635ceed1723SJan Kara err = sb->dq_op->write_dquot(dquot); 636ceed1723SJan Kara if (!ret && err) 637ceed1723SJan Kara err = ret; 638884d179dSJan Kara dqput(dquot); 639884d179dSJan Kara spin_lock(&dq_list_lock); 640884d179dSJan Kara } 641884d179dSJan Kara spin_unlock(&dq_list_lock); 642884d179dSJan Kara } 643884d179dSJan Kara 644884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 645884d179dSJan Kara if ((cnt == type || type == -1) && sb_has_quota_active(sb, cnt) 646884d179dSJan Kara && info_dirty(&dqopt->info[cnt])) 647884d179dSJan Kara sb->dq_op->write_info(sb, cnt); 648dde95888SDmitry Monakhov dqstats_inc(DQST_SYNCS); 649884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 650884d179dSJan Kara 651ceed1723SJan Kara return ret; 652ceed1723SJan Kara } 653ceed1723SJan Kara EXPORT_SYMBOL(dquot_writeback_dquots); 654ceed1723SJan Kara 655ceed1723SJan Kara /* Write all dquot structures to disk and make them visible from userspace */ 656ceed1723SJan Kara int dquot_quota_sync(struct super_block *sb, int type) 657ceed1723SJan Kara { 658ceed1723SJan Kara struct quota_info *dqopt = sb_dqopt(sb); 659ceed1723SJan Kara int cnt; 660ceed1723SJan Kara int ret; 661ceed1723SJan Kara 662ceed1723SJan Kara ret = dquot_writeback_dquots(sb, type); 663ceed1723SJan Kara if (ret) 664ceed1723SJan Kara return ret; 665ceed1723SJan Kara if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) 6665fb324adSChristoph Hellwig return 0; 6675fb324adSChristoph Hellwig 6685fb324adSChristoph Hellwig /* This is not very clever (and fast) but currently I don't know about 6695fb324adSChristoph Hellwig * any other simple way of getting quota data to disk and we must get 6705fb324adSChristoph Hellwig * them there for userspace to be visible... */ 6715fb324adSChristoph Hellwig if (sb->s_op->sync_fs) 6725fb324adSChristoph Hellwig sb->s_op->sync_fs(sb, 1); 6735fb324adSChristoph Hellwig sync_blockdev(sb->s_bdev); 6745fb324adSChristoph Hellwig 6755fb324adSChristoph Hellwig /* 6765fb324adSChristoph Hellwig * Now when everything is written we can discard the pagecache so 6775fb324adSChristoph Hellwig * that userspace sees the changes. 6785fb324adSChristoph Hellwig */ 679f9ef1784SJan Kara mutex_lock(&dqopt->dqonoff_mutex); 6805fb324adSChristoph Hellwig for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 6815fb324adSChristoph Hellwig if (type != -1 && cnt != type) 6825fb324adSChristoph Hellwig continue; 6835fb324adSChristoph Hellwig if (!sb_has_quota_active(sb, cnt)) 6845fb324adSChristoph Hellwig continue; 685a80b12c3SJan Kara mutex_lock(&dqopt->files[cnt]->i_mutex); 686f9ef1784SJan Kara truncate_inode_pages(&dqopt->files[cnt]->i_data, 0); 687f9ef1784SJan Kara mutex_unlock(&dqopt->files[cnt]->i_mutex); 6885fb324adSChristoph Hellwig } 689f9ef1784SJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 6905fb324adSChristoph Hellwig 691884d179dSJan Kara return 0; 692884d179dSJan Kara } 693287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_quota_sync); 694884d179dSJan Kara 6951ab6c499SDave Chinner static unsigned long 6961ab6c499SDave Chinner dqcache_shrink_scan(struct shrinker *shrink, struct shrink_control *sc) 697884d179dSJan Kara { 698884d179dSJan Kara struct list_head *head; 699884d179dSJan Kara struct dquot *dquot; 7001ab6c499SDave Chinner unsigned long freed = 0; 701884d179dSJan Kara 702d68aab6bSNiu Yawei spin_lock(&dq_list_lock); 703884d179dSJan Kara head = free_dquots.prev; 7041ab6c499SDave Chinner while (head != &free_dquots && sc->nr_to_scan) { 705884d179dSJan Kara dquot = list_entry(head, struct dquot, dq_free); 706884d179dSJan Kara remove_dquot_hash(dquot); 707884d179dSJan Kara remove_free_dquot(dquot); 708884d179dSJan Kara remove_inuse(dquot); 709884d179dSJan Kara do_destroy_dquot(dquot); 7101ab6c499SDave Chinner sc->nr_to_scan--; 7111ab6c499SDave Chinner freed++; 712884d179dSJan Kara head = free_dquots.prev; 713884d179dSJan Kara } 714d68aab6bSNiu Yawei spin_unlock(&dq_list_lock); 7151ab6c499SDave Chinner return freed; 716884d179dSJan Kara } 717884d179dSJan Kara 7181ab6c499SDave Chinner static unsigned long 7191ab6c499SDave Chinner dqcache_shrink_count(struct shrinker *shrink, struct shrink_control *sc) 720884d179dSJan Kara { 72155f841ceSGlauber Costa return vfs_pressure_ratio( 72255f841ceSGlauber Costa percpu_counter_read_positive(&dqstats.counter[DQST_FREE_DQUOTS])); 723884d179dSJan Kara } 724884d179dSJan Kara 725884d179dSJan Kara static struct shrinker dqcache_shrinker = { 7261ab6c499SDave Chinner .count_objects = dqcache_shrink_count, 7271ab6c499SDave Chinner .scan_objects = dqcache_shrink_scan, 728884d179dSJan Kara .seeks = DEFAULT_SEEKS, 729884d179dSJan Kara }; 730884d179dSJan Kara 731884d179dSJan Kara /* 732884d179dSJan Kara * Put reference to dquot 733884d179dSJan Kara */ 734884d179dSJan Kara void dqput(struct dquot *dquot) 735884d179dSJan Kara { 736884d179dSJan Kara int ret; 737884d179dSJan Kara 738884d179dSJan Kara if (!dquot) 739884d179dSJan Kara return; 74062af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 741884d179dSJan Kara if (!atomic_read(&dquot->dq_count)) { 742fb5ffb0eSJiaying Zhang quota_error(dquot->dq_sb, "trying to free free dquot of %s %d", 7434c376dcaSEric W. Biederman quotatypes[dquot->dq_id.type], 7444c376dcaSEric W. Biederman from_kqid(&init_user_ns, dquot->dq_id)); 745884d179dSJan Kara BUG(); 746884d179dSJan Kara } 747884d179dSJan Kara #endif 748dde95888SDmitry Monakhov dqstats_inc(DQST_DROPS); 749884d179dSJan Kara we_slept: 750884d179dSJan Kara spin_lock(&dq_list_lock); 751884d179dSJan Kara if (atomic_read(&dquot->dq_count) > 1) { 752884d179dSJan Kara /* We have more than one user... nothing to do */ 753884d179dSJan Kara atomic_dec(&dquot->dq_count); 754884d179dSJan Kara /* Releasing dquot during quotaoff phase? */ 7554c376dcaSEric W. Biederman if (!sb_has_quota_active(dquot->dq_sb, dquot->dq_id.type) && 756884d179dSJan Kara atomic_read(&dquot->dq_count) == 1) 757884d179dSJan Kara wake_up(&dquot->dq_wait_unused); 758884d179dSJan Kara spin_unlock(&dq_list_lock); 759884d179dSJan Kara return; 760884d179dSJan Kara } 761884d179dSJan Kara /* Need to release dquot? */ 762884d179dSJan Kara if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && dquot_dirty(dquot)) { 763884d179dSJan Kara spin_unlock(&dq_list_lock); 764884d179dSJan Kara /* Commit dquot before releasing */ 765884d179dSJan Kara ret = dquot->dq_sb->dq_op->write_dquot(dquot); 766884d179dSJan Kara if (ret < 0) { 767fb5ffb0eSJiaying Zhang quota_error(dquot->dq_sb, "Can't write quota structure" 768fb5ffb0eSJiaying Zhang " (error %d). Quota may get out of sync!", 769fb5ffb0eSJiaying Zhang ret); 770884d179dSJan Kara /* 771884d179dSJan Kara * We clear dirty bit anyway, so that we avoid 772884d179dSJan Kara * infinite loop here 773884d179dSJan Kara */ 774884d179dSJan Kara spin_lock(&dq_list_lock); 775884d179dSJan Kara clear_dquot_dirty(dquot); 776884d179dSJan Kara spin_unlock(&dq_list_lock); 777884d179dSJan Kara } 778884d179dSJan Kara goto we_slept; 779884d179dSJan Kara } 780884d179dSJan Kara /* Clear flag in case dquot was inactive (something bad happened) */ 781884d179dSJan Kara clear_dquot_dirty(dquot); 782884d179dSJan Kara if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { 783884d179dSJan Kara spin_unlock(&dq_list_lock); 784884d179dSJan Kara dquot->dq_sb->dq_op->release_dquot(dquot); 785884d179dSJan Kara goto we_slept; 786884d179dSJan Kara } 787884d179dSJan Kara atomic_dec(&dquot->dq_count); 78862af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 789884d179dSJan Kara /* sanity check */ 790884d179dSJan Kara BUG_ON(!list_empty(&dquot->dq_free)); 791884d179dSJan Kara #endif 792884d179dSJan Kara put_dquot_last(dquot); 793884d179dSJan Kara spin_unlock(&dq_list_lock); 794884d179dSJan Kara } 795884d179dSJan Kara EXPORT_SYMBOL(dqput); 796884d179dSJan Kara 797884d179dSJan Kara struct dquot *dquot_alloc(struct super_block *sb, int type) 798884d179dSJan Kara { 799884d179dSJan Kara return kmem_cache_zalloc(dquot_cachep, GFP_NOFS); 800884d179dSJan Kara } 801884d179dSJan Kara EXPORT_SYMBOL(dquot_alloc); 802884d179dSJan Kara 803884d179dSJan Kara static struct dquot *get_empty_dquot(struct super_block *sb, int type) 804884d179dSJan Kara { 805884d179dSJan Kara struct dquot *dquot; 806884d179dSJan Kara 807884d179dSJan Kara dquot = sb->dq_op->alloc_dquot(sb, type); 808884d179dSJan Kara if(!dquot) 809dd6f3c6dSJan Kara return NULL; 810884d179dSJan Kara 811884d179dSJan Kara mutex_init(&dquot->dq_lock); 812884d179dSJan Kara INIT_LIST_HEAD(&dquot->dq_free); 813884d179dSJan Kara INIT_LIST_HEAD(&dquot->dq_inuse); 814884d179dSJan Kara INIT_HLIST_NODE(&dquot->dq_hash); 815884d179dSJan Kara INIT_LIST_HEAD(&dquot->dq_dirty); 816884d179dSJan Kara init_waitqueue_head(&dquot->dq_wait_unused); 817884d179dSJan Kara dquot->dq_sb = sb; 8181a06d420SEric W. Biederman dquot->dq_id = make_kqid_invalid(type); 819884d179dSJan Kara atomic_set(&dquot->dq_count, 1); 820884d179dSJan Kara 821884d179dSJan Kara return dquot; 822884d179dSJan Kara } 823884d179dSJan Kara 824884d179dSJan Kara /* 825884d179dSJan Kara * Get reference to dquot 826884d179dSJan Kara * 827884d179dSJan Kara * Locking is slightly tricky here. We are guarded from parallel quotaoff() 828884d179dSJan Kara * destroying our dquot by: 829884d179dSJan Kara * a) checking for quota flags under dq_list_lock and 830884d179dSJan Kara * b) getting a reference to dquot before we release dq_list_lock 831884d179dSJan Kara */ 832aca645a6SEric W. Biederman struct dquot *dqget(struct super_block *sb, struct kqid qid) 833884d179dSJan Kara { 8341a06d420SEric W. Biederman unsigned int hashent = hashfn(sb, qid); 835dd6f3c6dSJan Kara struct dquot *dquot = NULL, *empty = NULL; 836884d179dSJan Kara 8371a06d420SEric W. Biederman if (!sb_has_quota_active(sb, qid.type)) 838dd6f3c6dSJan Kara return NULL; 839884d179dSJan Kara we_slept: 840884d179dSJan Kara spin_lock(&dq_list_lock); 841884d179dSJan Kara spin_lock(&dq_state_lock); 8421a06d420SEric W. Biederman if (!sb_has_quota_active(sb, qid.type)) { 843884d179dSJan Kara spin_unlock(&dq_state_lock); 844884d179dSJan Kara spin_unlock(&dq_list_lock); 845884d179dSJan Kara goto out; 846884d179dSJan Kara } 847884d179dSJan Kara spin_unlock(&dq_state_lock); 848884d179dSJan Kara 8491a06d420SEric W. Biederman dquot = find_dquot(hashent, sb, qid); 850dd6f3c6dSJan Kara if (!dquot) { 851dd6f3c6dSJan Kara if (!empty) { 852884d179dSJan Kara spin_unlock(&dq_list_lock); 8531a06d420SEric W. Biederman empty = get_empty_dquot(sb, qid.type); 854dd6f3c6dSJan Kara if (!empty) 855884d179dSJan Kara schedule(); /* Try to wait for a moment... */ 856884d179dSJan Kara goto we_slept; 857884d179dSJan Kara } 858884d179dSJan Kara dquot = empty; 859dd6f3c6dSJan Kara empty = NULL; 8604c376dcaSEric W. Biederman dquot->dq_id = qid; 861884d179dSJan Kara /* all dquots go on the inuse_list */ 862884d179dSJan Kara put_inuse(dquot); 863884d179dSJan Kara /* hash it first so it can be found */ 864884d179dSJan Kara insert_dquot_hash(dquot); 865884d179dSJan Kara spin_unlock(&dq_list_lock); 866dde95888SDmitry Monakhov dqstats_inc(DQST_LOOKUPS); 867884d179dSJan Kara } else { 868884d179dSJan Kara if (!atomic_read(&dquot->dq_count)) 869884d179dSJan Kara remove_free_dquot(dquot); 870884d179dSJan Kara atomic_inc(&dquot->dq_count); 871884d179dSJan Kara spin_unlock(&dq_list_lock); 872dde95888SDmitry Monakhov dqstats_inc(DQST_CACHE_HITS); 873dde95888SDmitry Monakhov dqstats_inc(DQST_LOOKUPS); 874884d179dSJan Kara } 875268157baSJan Kara /* Wait for dq_lock - after this we know that either dquot_release() is 876268157baSJan Kara * already finished or it will be canceled due to dq_count > 1 test */ 877884d179dSJan Kara wait_on_dquot(dquot); 878268157baSJan Kara /* Read the dquot / allocate space in quota file */ 879268157baSJan Kara if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && 880268157baSJan Kara sb->dq_op->acquire_dquot(dquot) < 0) { 881884d179dSJan Kara dqput(dquot); 882dd6f3c6dSJan Kara dquot = NULL; 883884d179dSJan Kara goto out; 884884d179dSJan Kara } 88562af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 886884d179dSJan Kara BUG_ON(!dquot->dq_sb); /* Has somebody invalidated entry under us? */ 887884d179dSJan Kara #endif 888884d179dSJan Kara out: 889884d179dSJan Kara if (empty) 890884d179dSJan Kara do_destroy_dquot(empty); 891884d179dSJan Kara 892884d179dSJan Kara return dquot; 893884d179dSJan Kara } 894884d179dSJan Kara EXPORT_SYMBOL(dqget); 895884d179dSJan Kara 896884d179dSJan Kara static int dqinit_needed(struct inode *inode, int type) 897884d179dSJan Kara { 898884d179dSJan Kara int cnt; 899884d179dSJan Kara 900884d179dSJan Kara if (IS_NOQUOTA(inode)) 901884d179dSJan Kara return 0; 902884d179dSJan Kara if (type != -1) 903dd6f3c6dSJan Kara return !inode->i_dquot[type]; 904884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 905dd6f3c6dSJan Kara if (!inode->i_dquot[cnt]) 906884d179dSJan Kara return 1; 907884d179dSJan Kara return 0; 908884d179dSJan Kara } 909884d179dSJan Kara 910884d179dSJan Kara /* This routine is guarded by dqonoff_mutex mutex */ 911884d179dSJan Kara static void add_dquot_ref(struct super_block *sb, int type) 912884d179dSJan Kara { 913884d179dSJan Kara struct inode *inode, *old_inode = NULL; 91462af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 9150a5a9c72SJan Kara int reserved = 0; 9164c5e6c0eSJan Kara #endif 917884d179dSJan Kara 91855fa6091SDave Chinner spin_lock(&inode_sb_list_lock); 919884d179dSJan Kara list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { 920250df6edSDave Chinner spin_lock(&inode->i_lock); 921250df6edSDave Chinner if ((inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW)) || 922250df6edSDave Chinner !atomic_read(&inode->i_writecount) || 923250df6edSDave Chinner !dqinit_needed(inode, type)) { 924250df6edSDave Chinner spin_unlock(&inode->i_lock); 9253ae5080fSLinus Torvalds continue; 926250df6edSDave Chinner } 927884d179dSJan Kara __iget(inode); 928250df6edSDave Chinner spin_unlock(&inode->i_lock); 92955fa6091SDave Chinner spin_unlock(&inode_sb_list_lock); 930884d179dSJan Kara 931d7e97117SJan Kara #ifdef CONFIG_QUOTA_DEBUG 932d7e97117SJan Kara if (unlikely(inode_get_rsv_space(inode) > 0)) 933d7e97117SJan Kara reserved = 1; 934d7e97117SJan Kara #endif 935884d179dSJan Kara iput(old_inode); 936871a2931SChristoph Hellwig __dquot_initialize(inode, type); 93755fa6091SDave Chinner 93855fa6091SDave Chinner /* 93955fa6091SDave Chinner * We hold a reference to 'inode' so it couldn't have been 94055fa6091SDave Chinner * removed from s_inodes list while we dropped the 94155fa6091SDave Chinner * inode_sb_list_lock We cannot iput the inode now as we can be 94255fa6091SDave Chinner * holding the last reference and we cannot iput it under 94355fa6091SDave Chinner * inode_sb_list_lock. So we keep the reference and iput it 94455fa6091SDave Chinner * later. 94555fa6091SDave Chinner */ 946884d179dSJan Kara old_inode = inode; 94755fa6091SDave Chinner spin_lock(&inode_sb_list_lock); 948884d179dSJan Kara } 94955fa6091SDave Chinner spin_unlock(&inode_sb_list_lock); 950884d179dSJan Kara iput(old_inode); 9510a5a9c72SJan Kara 95262af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 9530a5a9c72SJan Kara if (reserved) { 954fb5ffb0eSJiaying Zhang quota_error(sb, "Writes happened before quota was turned on " 955fb5ffb0eSJiaying Zhang "thus quota information is probably inconsistent. " 956fb5ffb0eSJiaying Zhang "Please run quotacheck(8)"); 9570a5a9c72SJan Kara } 9584c5e6c0eSJan Kara #endif 959884d179dSJan Kara } 960884d179dSJan Kara 961268157baSJan Kara /* 962268157baSJan Kara * Remove references to dquots from inode and add dquot to list for freeing 96325985edcSLucas De Marchi * if we have the last reference to dquot 964268157baSJan Kara */ 9659eb6463fSNiu Yawei static void remove_inode_dquot_ref(struct inode *inode, int type, 966884d179dSJan Kara struct list_head *tofree_head) 967884d179dSJan Kara { 968884d179dSJan Kara struct dquot *dquot = inode->i_dquot[type]; 969884d179dSJan Kara 970dd6f3c6dSJan Kara inode->i_dquot[type] = NULL; 9719eb6463fSNiu Yawei if (!dquot) 9729eb6463fSNiu Yawei return; 9739eb6463fSNiu Yawei 9749eb6463fSNiu Yawei if (list_empty(&dquot->dq_free)) { 9759eb6463fSNiu Yawei /* 9769eb6463fSNiu Yawei * The inode still has reference to dquot so it can't be in the 9779eb6463fSNiu Yawei * free list 9789eb6463fSNiu Yawei */ 979884d179dSJan Kara spin_lock(&dq_list_lock); 980268157baSJan Kara list_add(&dquot->dq_free, tofree_head); 981884d179dSJan Kara spin_unlock(&dq_list_lock); 9829eb6463fSNiu Yawei } else { 9839eb6463fSNiu Yawei /* 9849eb6463fSNiu Yawei * Dquot is already in a list to put so we won't drop the last 9859eb6463fSNiu Yawei * reference here. 9869eb6463fSNiu Yawei */ 9879eb6463fSNiu Yawei dqput(dquot); 988884d179dSJan Kara } 989884d179dSJan Kara } 990884d179dSJan Kara 991268157baSJan Kara /* 992268157baSJan Kara * Free list of dquots 993268157baSJan Kara * Dquots are removed from inodes and no new references can be got so we are 994268157baSJan Kara * the only ones holding reference 995268157baSJan Kara */ 996884d179dSJan Kara static void put_dquot_list(struct list_head *tofree_head) 997884d179dSJan Kara { 998884d179dSJan Kara struct list_head *act_head; 999884d179dSJan Kara struct dquot *dquot; 1000884d179dSJan Kara 1001884d179dSJan Kara act_head = tofree_head->next; 1002884d179dSJan Kara while (act_head != tofree_head) { 1003884d179dSJan Kara dquot = list_entry(act_head, struct dquot, dq_free); 1004884d179dSJan Kara act_head = act_head->next; 1005268157baSJan Kara /* Remove dquot from the list so we won't have problems... */ 1006268157baSJan Kara list_del_init(&dquot->dq_free); 1007884d179dSJan Kara dqput(dquot); 1008884d179dSJan Kara } 1009884d179dSJan Kara } 1010884d179dSJan Kara 1011884d179dSJan Kara static void remove_dquot_ref(struct super_block *sb, int type, 1012884d179dSJan Kara struct list_head *tofree_head) 1013884d179dSJan Kara { 1014884d179dSJan Kara struct inode *inode; 10157af9cce8SDmitry Monakhov int reserved = 0; 1016884d179dSJan Kara 101755fa6091SDave Chinner spin_lock(&inode_sb_list_lock); 1018884d179dSJan Kara list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { 10193ae5080fSLinus Torvalds /* 10203ae5080fSLinus Torvalds * We have to scan also I_NEW inodes because they can already 10213ae5080fSLinus Torvalds * have quota pointer initialized. Luckily, we need to touch 10223ae5080fSLinus Torvalds * only quota pointers and these have separate locking 1023b9ba6f94SNiu Yawei * (dq_data_lock). 10243ae5080fSLinus Torvalds */ 1025b9ba6f94SNiu Yawei spin_lock(&dq_data_lock); 10267af9cce8SDmitry Monakhov if (!IS_NOQUOTA(inode)) { 10277af9cce8SDmitry Monakhov if (unlikely(inode_get_rsv_space(inode) > 0)) 10287af9cce8SDmitry Monakhov reserved = 1; 1029884d179dSJan Kara remove_inode_dquot_ref(inode, type, tofree_head); 1030884d179dSJan Kara } 1031b9ba6f94SNiu Yawei spin_unlock(&dq_data_lock); 10327af9cce8SDmitry Monakhov } 103355fa6091SDave Chinner spin_unlock(&inode_sb_list_lock); 10347af9cce8SDmitry Monakhov #ifdef CONFIG_QUOTA_DEBUG 10357af9cce8SDmitry Monakhov if (reserved) { 10367af9cce8SDmitry Monakhov printk(KERN_WARNING "VFS (%s): Writes happened after quota" 10377af9cce8SDmitry Monakhov " was disabled thus quota information is probably " 10387af9cce8SDmitry Monakhov "inconsistent. Please run quotacheck(8).\n", sb->s_id); 10397af9cce8SDmitry Monakhov } 10407af9cce8SDmitry Monakhov #endif 1041884d179dSJan Kara } 1042884d179dSJan Kara 1043884d179dSJan Kara /* Gather all references from inodes and drop them */ 1044884d179dSJan Kara static void drop_dquot_ref(struct super_block *sb, int type) 1045884d179dSJan Kara { 1046884d179dSJan Kara LIST_HEAD(tofree_head); 1047884d179dSJan Kara 1048884d179dSJan Kara if (sb->dq_op) { 1049884d179dSJan Kara remove_dquot_ref(sb, type, &tofree_head); 1050b9ba6f94SNiu Yawei synchronize_srcu(&dquot_srcu); 1051884d179dSJan Kara put_dquot_list(&tofree_head); 1052884d179dSJan Kara } 1053884d179dSJan Kara } 1054884d179dSJan Kara 1055884d179dSJan Kara static inline void dquot_incr_inodes(struct dquot *dquot, qsize_t number) 1056884d179dSJan Kara { 1057884d179dSJan Kara dquot->dq_dqb.dqb_curinodes += number; 1058884d179dSJan Kara } 1059884d179dSJan Kara 1060884d179dSJan Kara static inline void dquot_incr_space(struct dquot *dquot, qsize_t number) 1061884d179dSJan Kara { 1062884d179dSJan Kara dquot->dq_dqb.dqb_curspace += number; 1063884d179dSJan Kara } 1064884d179dSJan Kara 1065884d179dSJan Kara static inline void dquot_resv_space(struct dquot *dquot, qsize_t number) 1066884d179dSJan Kara { 1067884d179dSJan Kara dquot->dq_dqb.dqb_rsvspace += number; 1068884d179dSJan Kara } 1069884d179dSJan Kara 1070884d179dSJan Kara /* 1071884d179dSJan Kara * Claim reserved quota space 1072884d179dSJan Kara */ 10730a5a9c72SJan Kara static void dquot_claim_reserved_space(struct dquot *dquot, qsize_t number) 1074884d179dSJan Kara { 10750a5a9c72SJan Kara if (dquot->dq_dqb.dqb_rsvspace < number) { 10760a5a9c72SJan Kara WARN_ON_ONCE(1); 10770a5a9c72SJan Kara number = dquot->dq_dqb.dqb_rsvspace; 10780a5a9c72SJan Kara } 1079884d179dSJan Kara dquot->dq_dqb.dqb_curspace += number; 1080884d179dSJan Kara dquot->dq_dqb.dqb_rsvspace -= number; 1081884d179dSJan Kara } 1082884d179dSJan Kara 10831c8924ebSJan Kara static void dquot_reclaim_reserved_space(struct dquot *dquot, qsize_t number) 10841c8924ebSJan Kara { 10851c8924ebSJan Kara if (WARN_ON_ONCE(dquot->dq_dqb.dqb_curspace < number)) 10861c8924ebSJan Kara number = dquot->dq_dqb.dqb_curspace; 10871c8924ebSJan Kara dquot->dq_dqb.dqb_rsvspace += number; 10881c8924ebSJan Kara dquot->dq_dqb.dqb_curspace -= number; 10891c8924ebSJan Kara } 10901c8924ebSJan Kara 1091884d179dSJan Kara static inline 1092884d179dSJan Kara void dquot_free_reserved_space(struct dquot *dquot, qsize_t number) 1093884d179dSJan Kara { 10940a5a9c72SJan Kara if (dquot->dq_dqb.dqb_rsvspace >= number) 1095884d179dSJan Kara dquot->dq_dqb.dqb_rsvspace -= number; 10960a5a9c72SJan Kara else { 10970a5a9c72SJan Kara WARN_ON_ONCE(1); 10980a5a9c72SJan Kara dquot->dq_dqb.dqb_rsvspace = 0; 10990a5a9c72SJan Kara } 1100884d179dSJan Kara } 1101884d179dSJan Kara 11027a2435d8SJan Kara static void dquot_decr_inodes(struct dquot *dquot, qsize_t number) 1103884d179dSJan Kara { 1104884d179dSJan Kara if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE || 1105884d179dSJan Kara dquot->dq_dqb.dqb_curinodes >= number) 1106884d179dSJan Kara dquot->dq_dqb.dqb_curinodes -= number; 1107884d179dSJan Kara else 1108884d179dSJan Kara dquot->dq_dqb.dqb_curinodes = 0; 1109884d179dSJan Kara if (dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit) 1110884d179dSJan Kara dquot->dq_dqb.dqb_itime = (time_t) 0; 1111884d179dSJan Kara clear_bit(DQ_INODES_B, &dquot->dq_flags); 1112884d179dSJan Kara } 1113884d179dSJan Kara 11147a2435d8SJan Kara static void dquot_decr_space(struct dquot *dquot, qsize_t number) 1115884d179dSJan Kara { 1116884d179dSJan Kara if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE || 1117884d179dSJan Kara dquot->dq_dqb.dqb_curspace >= number) 1118884d179dSJan Kara dquot->dq_dqb.dqb_curspace -= number; 1119884d179dSJan Kara else 1120884d179dSJan Kara dquot->dq_dqb.dqb_curspace = 0; 1121884d179dSJan Kara if (dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit) 1122884d179dSJan Kara dquot->dq_dqb.dqb_btime = (time_t) 0; 1123884d179dSJan Kara clear_bit(DQ_BLKS_B, &dquot->dq_flags); 1124884d179dSJan Kara } 1125884d179dSJan Kara 1126bf097aafSJan Kara struct dquot_warn { 1127bf097aafSJan Kara struct super_block *w_sb; 11287b9c7321SEric W. Biederman struct kqid w_dq_id; 1129bf097aafSJan Kara short w_type; 1130bf097aafSJan Kara }; 1131bf097aafSJan Kara 1132884d179dSJan Kara static int warning_issued(struct dquot *dquot, const int warntype) 1133884d179dSJan Kara { 1134884d179dSJan Kara int flag = (warntype == QUOTA_NL_BHARDWARN || 1135884d179dSJan Kara warntype == QUOTA_NL_BSOFTLONGWARN) ? DQ_BLKS_B : 1136884d179dSJan Kara ((warntype == QUOTA_NL_IHARDWARN || 1137884d179dSJan Kara warntype == QUOTA_NL_ISOFTLONGWARN) ? DQ_INODES_B : 0); 1138884d179dSJan Kara 1139884d179dSJan Kara if (!flag) 1140884d179dSJan Kara return 0; 1141884d179dSJan Kara return test_and_set_bit(flag, &dquot->dq_flags); 1142884d179dSJan Kara } 1143884d179dSJan Kara 1144884d179dSJan Kara #ifdef CONFIG_PRINT_QUOTA_WARNING 1145884d179dSJan Kara static int flag_print_warnings = 1; 1146884d179dSJan Kara 1147bf097aafSJan Kara static int need_print_warning(struct dquot_warn *warn) 1148884d179dSJan Kara { 1149884d179dSJan Kara if (!flag_print_warnings) 1150884d179dSJan Kara return 0; 1151884d179dSJan Kara 11527b9c7321SEric W. Biederman switch (warn->w_dq_id.type) { 1153884d179dSJan Kara case USRQUOTA: 11541a06d420SEric W. Biederman return uid_eq(current_fsuid(), warn->w_dq_id.uid); 1155884d179dSJan Kara case GRPQUOTA: 11567b9c7321SEric W. Biederman return in_group_p(warn->w_dq_id.gid); 11576c29c50fSJan Kara case PRJQUOTA: /* Never taken... Just make gcc happy */ 11586c29c50fSJan Kara return 0; 1159884d179dSJan Kara } 1160884d179dSJan Kara return 0; 1161884d179dSJan Kara } 1162884d179dSJan Kara 1163884d179dSJan Kara /* Print warning to user which exceeded quota */ 1164bf097aafSJan Kara static void print_warning(struct dquot_warn *warn) 1165884d179dSJan Kara { 1166884d179dSJan Kara char *msg = NULL; 1167884d179dSJan Kara struct tty_struct *tty; 1168bf097aafSJan Kara int warntype = warn->w_type; 1169884d179dSJan Kara 1170884d179dSJan Kara if (warntype == QUOTA_NL_IHARDBELOW || 1171884d179dSJan Kara warntype == QUOTA_NL_ISOFTBELOW || 1172884d179dSJan Kara warntype == QUOTA_NL_BHARDBELOW || 1173bf097aafSJan Kara warntype == QUOTA_NL_BSOFTBELOW || !need_print_warning(warn)) 1174884d179dSJan Kara return; 1175884d179dSJan Kara 1176884d179dSJan Kara tty = get_current_tty(); 1177884d179dSJan Kara if (!tty) 1178884d179dSJan Kara return; 1179bf097aafSJan Kara tty_write_message(tty, warn->w_sb->s_id); 1180884d179dSJan Kara if (warntype == QUOTA_NL_ISOFTWARN || warntype == QUOTA_NL_BSOFTWARN) 1181884d179dSJan Kara tty_write_message(tty, ": warning, "); 1182884d179dSJan Kara else 1183884d179dSJan Kara tty_write_message(tty, ": write failed, "); 11847b9c7321SEric W. Biederman tty_write_message(tty, quotatypes[warn->w_dq_id.type]); 1185884d179dSJan Kara switch (warntype) { 1186884d179dSJan Kara case QUOTA_NL_IHARDWARN: 1187884d179dSJan Kara msg = " file limit reached.\r\n"; 1188884d179dSJan Kara break; 1189884d179dSJan Kara case QUOTA_NL_ISOFTLONGWARN: 1190884d179dSJan Kara msg = " file quota exceeded too long.\r\n"; 1191884d179dSJan Kara break; 1192884d179dSJan Kara case QUOTA_NL_ISOFTWARN: 1193884d179dSJan Kara msg = " file quota exceeded.\r\n"; 1194884d179dSJan Kara break; 1195884d179dSJan Kara case QUOTA_NL_BHARDWARN: 1196884d179dSJan Kara msg = " block limit reached.\r\n"; 1197884d179dSJan Kara break; 1198884d179dSJan Kara case QUOTA_NL_BSOFTLONGWARN: 1199884d179dSJan Kara msg = " block quota exceeded too long.\r\n"; 1200884d179dSJan Kara break; 1201884d179dSJan Kara case QUOTA_NL_BSOFTWARN: 1202884d179dSJan Kara msg = " block quota exceeded.\r\n"; 1203884d179dSJan Kara break; 1204884d179dSJan Kara } 1205884d179dSJan Kara tty_write_message(tty, msg); 1206884d179dSJan Kara tty_kref_put(tty); 1207884d179dSJan Kara } 1208884d179dSJan Kara #endif 1209884d179dSJan Kara 1210bf097aafSJan Kara static void prepare_warning(struct dquot_warn *warn, struct dquot *dquot, 1211bf097aafSJan Kara int warntype) 1212bf097aafSJan Kara { 1213bf097aafSJan Kara if (warning_issued(dquot, warntype)) 1214bf097aafSJan Kara return; 1215bf097aafSJan Kara warn->w_type = warntype; 1216bf097aafSJan Kara warn->w_sb = dquot->dq_sb; 1217bf097aafSJan Kara warn->w_dq_id = dquot->dq_id; 1218bf097aafSJan Kara } 1219bf097aafSJan Kara 1220884d179dSJan Kara /* 1221884d179dSJan Kara * Write warnings to the console and send warning messages over netlink. 1222884d179dSJan Kara * 1223bf097aafSJan Kara * Note that this function can call into tty and networking code. 1224884d179dSJan Kara */ 1225bf097aafSJan Kara static void flush_warnings(struct dquot_warn *warn) 1226884d179dSJan Kara { 1227884d179dSJan Kara int i; 1228884d179dSJan Kara 122986e931a3SSteven Whitehouse for (i = 0; i < MAXQUOTAS; i++) { 1230bf097aafSJan Kara if (warn[i].w_type == QUOTA_NL_NOWARN) 1231bf097aafSJan Kara continue; 1232884d179dSJan Kara #ifdef CONFIG_PRINT_QUOTA_WARNING 1233bf097aafSJan Kara print_warning(&warn[i]); 1234884d179dSJan Kara #endif 12357b9c7321SEric W. Biederman quota_send_warning(warn[i].w_dq_id, 1236bf097aafSJan Kara warn[i].w_sb->s_dev, warn[i].w_type); 1237884d179dSJan Kara } 1238884d179dSJan Kara } 1239884d179dSJan Kara 12407a2435d8SJan Kara static int ignore_hardlimit(struct dquot *dquot) 1241884d179dSJan Kara { 12424c376dcaSEric W. Biederman struct mem_dqinfo *info = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_id.type]; 1243884d179dSJan Kara 1244884d179dSJan Kara return capable(CAP_SYS_RESOURCE) && 1245268157baSJan Kara (info->dqi_format->qf_fmt_id != QFMT_VFS_OLD || 1246268157baSJan Kara !(info->dqi_flags & V1_DQF_RSQUASH)); 1247884d179dSJan Kara } 1248884d179dSJan Kara 1249884d179dSJan Kara /* needs dq_data_lock */ 1250bf097aafSJan Kara static int check_idq(struct dquot *dquot, qsize_t inodes, 1251bf097aafSJan Kara struct dquot_warn *warn) 1252884d179dSJan Kara { 1253268157baSJan Kara qsize_t newinodes = dquot->dq_dqb.dqb_curinodes + inodes; 1254268157baSJan Kara 12554c376dcaSEric W. Biederman if (!sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_id.type) || 1256884d179dSJan Kara test_bit(DQ_FAKE_B, &dquot->dq_flags)) 1257efd8f0e6SChristoph Hellwig return 0; 1258884d179dSJan Kara 1259884d179dSJan Kara if (dquot->dq_dqb.dqb_ihardlimit && 1260268157baSJan Kara newinodes > dquot->dq_dqb.dqb_ihardlimit && 1261884d179dSJan Kara !ignore_hardlimit(dquot)) { 1262bf097aafSJan Kara prepare_warning(warn, dquot, QUOTA_NL_IHARDWARN); 1263efd8f0e6SChristoph Hellwig return -EDQUOT; 1264884d179dSJan Kara } 1265884d179dSJan Kara 1266884d179dSJan Kara if (dquot->dq_dqb.dqb_isoftlimit && 1267268157baSJan Kara newinodes > dquot->dq_dqb.dqb_isoftlimit && 1268268157baSJan Kara dquot->dq_dqb.dqb_itime && 1269268157baSJan Kara get_seconds() >= dquot->dq_dqb.dqb_itime && 1270884d179dSJan Kara !ignore_hardlimit(dquot)) { 1271bf097aafSJan Kara prepare_warning(warn, dquot, QUOTA_NL_ISOFTLONGWARN); 1272efd8f0e6SChristoph Hellwig return -EDQUOT; 1273884d179dSJan Kara } 1274884d179dSJan Kara 1275884d179dSJan Kara if (dquot->dq_dqb.dqb_isoftlimit && 1276268157baSJan Kara newinodes > dquot->dq_dqb.dqb_isoftlimit && 1277884d179dSJan Kara dquot->dq_dqb.dqb_itime == 0) { 1278bf097aafSJan Kara prepare_warning(warn, dquot, QUOTA_NL_ISOFTWARN); 1279268157baSJan Kara dquot->dq_dqb.dqb_itime = get_seconds() + 12804c376dcaSEric W. Biederman sb_dqopt(dquot->dq_sb)->info[dquot->dq_id.type].dqi_igrace; 1281884d179dSJan Kara } 1282884d179dSJan Kara 1283efd8f0e6SChristoph Hellwig return 0; 1284884d179dSJan Kara } 1285884d179dSJan Kara 1286884d179dSJan Kara /* needs dq_data_lock */ 1287bf097aafSJan Kara static int check_bdq(struct dquot *dquot, qsize_t space, int prealloc, 1288bf097aafSJan Kara struct dquot_warn *warn) 1289884d179dSJan Kara { 1290884d179dSJan Kara qsize_t tspace; 1291268157baSJan Kara struct super_block *sb = dquot->dq_sb; 1292884d179dSJan Kara 12934c376dcaSEric W. Biederman if (!sb_has_quota_limits_enabled(sb, dquot->dq_id.type) || 1294884d179dSJan Kara test_bit(DQ_FAKE_B, &dquot->dq_flags)) 1295efd8f0e6SChristoph Hellwig return 0; 1296884d179dSJan Kara 1297884d179dSJan Kara tspace = dquot->dq_dqb.dqb_curspace + dquot->dq_dqb.dqb_rsvspace 1298884d179dSJan Kara + space; 1299884d179dSJan Kara 1300884d179dSJan Kara if (dquot->dq_dqb.dqb_bhardlimit && 1301884d179dSJan Kara tspace > dquot->dq_dqb.dqb_bhardlimit && 1302884d179dSJan Kara !ignore_hardlimit(dquot)) { 1303884d179dSJan Kara if (!prealloc) 1304bf097aafSJan Kara prepare_warning(warn, dquot, QUOTA_NL_BHARDWARN); 1305efd8f0e6SChristoph Hellwig return -EDQUOT; 1306884d179dSJan Kara } 1307884d179dSJan Kara 1308884d179dSJan Kara if (dquot->dq_dqb.dqb_bsoftlimit && 1309884d179dSJan Kara tspace > dquot->dq_dqb.dqb_bsoftlimit && 1310268157baSJan Kara dquot->dq_dqb.dqb_btime && 1311268157baSJan Kara get_seconds() >= dquot->dq_dqb.dqb_btime && 1312884d179dSJan Kara !ignore_hardlimit(dquot)) { 1313884d179dSJan Kara if (!prealloc) 1314bf097aafSJan Kara prepare_warning(warn, dquot, QUOTA_NL_BSOFTLONGWARN); 1315efd8f0e6SChristoph Hellwig return -EDQUOT; 1316884d179dSJan Kara } 1317884d179dSJan Kara 1318884d179dSJan Kara if (dquot->dq_dqb.dqb_bsoftlimit && 1319884d179dSJan Kara tspace > dquot->dq_dqb.dqb_bsoftlimit && 1320884d179dSJan Kara dquot->dq_dqb.dqb_btime == 0) { 1321884d179dSJan Kara if (!prealloc) { 1322bf097aafSJan Kara prepare_warning(warn, dquot, QUOTA_NL_BSOFTWARN); 1323268157baSJan Kara dquot->dq_dqb.dqb_btime = get_seconds() + 13244c376dcaSEric W. Biederman sb_dqopt(sb)->info[dquot->dq_id.type].dqi_bgrace; 1325884d179dSJan Kara } 1326884d179dSJan Kara else 1327884d179dSJan Kara /* 1328884d179dSJan Kara * We don't allow preallocation to exceed softlimit so exceeding will 1329884d179dSJan Kara * be always printed 1330884d179dSJan Kara */ 1331efd8f0e6SChristoph Hellwig return -EDQUOT; 1332884d179dSJan Kara } 1333884d179dSJan Kara 1334efd8f0e6SChristoph Hellwig return 0; 1335884d179dSJan Kara } 1336884d179dSJan Kara 1337884d179dSJan Kara static int info_idq_free(struct dquot *dquot, qsize_t inodes) 1338884d179dSJan Kara { 1339268157baSJan Kara qsize_t newinodes; 1340268157baSJan Kara 1341884d179dSJan Kara if (test_bit(DQ_FAKE_B, &dquot->dq_flags) || 1342884d179dSJan Kara dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit || 13434c376dcaSEric W. Biederman !sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_id.type)) 1344884d179dSJan Kara return QUOTA_NL_NOWARN; 1345884d179dSJan Kara 1346268157baSJan Kara newinodes = dquot->dq_dqb.dqb_curinodes - inodes; 1347268157baSJan Kara if (newinodes <= dquot->dq_dqb.dqb_isoftlimit) 1348884d179dSJan Kara return QUOTA_NL_ISOFTBELOW; 1349884d179dSJan Kara if (dquot->dq_dqb.dqb_curinodes >= dquot->dq_dqb.dqb_ihardlimit && 1350268157baSJan Kara newinodes < dquot->dq_dqb.dqb_ihardlimit) 1351884d179dSJan Kara return QUOTA_NL_IHARDBELOW; 1352884d179dSJan Kara return QUOTA_NL_NOWARN; 1353884d179dSJan Kara } 1354884d179dSJan Kara 1355884d179dSJan Kara static int info_bdq_free(struct dquot *dquot, qsize_t space) 1356884d179dSJan Kara { 1357884d179dSJan Kara if (test_bit(DQ_FAKE_B, &dquot->dq_flags) || 1358884d179dSJan Kara dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit) 1359884d179dSJan Kara return QUOTA_NL_NOWARN; 1360884d179dSJan Kara 1361884d179dSJan Kara if (dquot->dq_dqb.dqb_curspace - space <= dquot->dq_dqb.dqb_bsoftlimit) 1362884d179dSJan Kara return QUOTA_NL_BSOFTBELOW; 1363884d179dSJan Kara if (dquot->dq_dqb.dqb_curspace >= dquot->dq_dqb.dqb_bhardlimit && 1364884d179dSJan Kara dquot->dq_dqb.dqb_curspace - space < dquot->dq_dqb.dqb_bhardlimit) 1365884d179dSJan Kara return QUOTA_NL_BHARDBELOW; 1366884d179dSJan Kara return QUOTA_NL_NOWARN; 1367884d179dSJan Kara } 13680a5a9c72SJan Kara 1369189eef59SChristoph Hellwig static int dquot_active(const struct inode *inode) 1370189eef59SChristoph Hellwig { 1371189eef59SChristoph Hellwig struct super_block *sb = inode->i_sb; 1372189eef59SChristoph Hellwig 1373189eef59SChristoph Hellwig if (IS_NOQUOTA(inode)) 1374189eef59SChristoph Hellwig return 0; 1375189eef59SChristoph Hellwig return sb_any_quota_loaded(sb) & ~sb_any_quota_suspended(sb); 1376189eef59SChristoph Hellwig } 1377189eef59SChristoph Hellwig 1378884d179dSJan Kara /* 1379884d179dSJan Kara * Initialize quota pointers in inode 1380871a2931SChristoph Hellwig * 1381871a2931SChristoph Hellwig * It is better to call this function outside of any transaction as it 1382871a2931SChristoph Hellwig * might need a lot of space in journal for dquot structure allocation. 1383884d179dSJan Kara */ 1384871a2931SChristoph Hellwig static void __dquot_initialize(struct inode *inode, int type) 1385884d179dSJan Kara { 13861ea06becSNiu Yawei int cnt, init_needed = 0; 1387ad1e6e8dSDmitry Monakhov struct dquot *got[MAXQUOTAS]; 1388884d179dSJan Kara struct super_block *sb = inode->i_sb; 13890a5a9c72SJan Kara qsize_t rsv; 1390884d179dSJan Kara 1391189eef59SChristoph Hellwig if (!dquot_active(inode)) 1392871a2931SChristoph Hellwig return; 1393884d179dSJan Kara 1394884d179dSJan Kara /* First get references to structures we might need. */ 1395884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1396aca645a6SEric W. Biederman struct kqid qid; 1397ad1e6e8dSDmitry Monakhov got[cnt] = NULL; 1398884d179dSJan Kara if (type != -1 && cnt != type) 1399884d179dSJan Kara continue; 14001ea06becSNiu Yawei /* 14011ea06becSNiu Yawei * The i_dquot should have been initialized in most cases, 14021ea06becSNiu Yawei * we check it without locking here to avoid unnecessary 14031ea06becSNiu Yawei * dqget()/dqput() calls. 14041ea06becSNiu Yawei */ 14051ea06becSNiu Yawei if (inode->i_dquot[cnt]) 14061ea06becSNiu Yawei continue; 14071ea06becSNiu Yawei init_needed = 1; 14081ea06becSNiu Yawei 1409884d179dSJan Kara switch (cnt) { 1410884d179dSJan Kara case USRQUOTA: 1411aca645a6SEric W. Biederman qid = make_kqid_uid(inode->i_uid); 1412884d179dSJan Kara break; 1413884d179dSJan Kara case GRPQUOTA: 1414aca645a6SEric W. Biederman qid = make_kqid_gid(inode->i_gid); 1415884d179dSJan Kara break; 1416884d179dSJan Kara } 1417aca645a6SEric W. Biederman got[cnt] = dqget(sb, qid); 1418884d179dSJan Kara } 1419884d179dSJan Kara 14201ea06becSNiu Yawei /* All required i_dquot has been initialized */ 14211ea06becSNiu Yawei if (!init_needed) 14221ea06becSNiu Yawei return; 14231ea06becSNiu Yawei 1424b9ba6f94SNiu Yawei spin_lock(&dq_data_lock); 1425884d179dSJan Kara if (IS_NOQUOTA(inode)) 1426884d179dSJan Kara goto out_err; 1427884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1428884d179dSJan Kara if (type != -1 && cnt != type) 1429884d179dSJan Kara continue; 1430884d179dSJan Kara /* Avoid races with quotaoff() */ 1431884d179dSJan Kara if (!sb_has_quota_active(sb, cnt)) 1432884d179dSJan Kara continue; 14334408ea41SJan Kara /* We could race with quotaon or dqget() could have failed */ 14344408ea41SJan Kara if (!got[cnt]) 14354408ea41SJan Kara continue; 1436dd6f3c6dSJan Kara if (!inode->i_dquot[cnt]) { 1437884d179dSJan Kara inode->i_dquot[cnt] = got[cnt]; 1438dd6f3c6dSJan Kara got[cnt] = NULL; 14390a5a9c72SJan Kara /* 14400a5a9c72SJan Kara * Make quota reservation system happy if someone 14410a5a9c72SJan Kara * did a write before quota was turned on 14420a5a9c72SJan Kara */ 14430a5a9c72SJan Kara rsv = inode_get_rsv_space(inode); 1444b9ba6f94SNiu Yawei if (unlikely(rsv)) 14450a5a9c72SJan Kara dquot_resv_space(inode->i_dquot[cnt], rsv); 1446884d179dSJan Kara } 1447884d179dSJan Kara } 1448884d179dSJan Kara out_err: 1449b9ba6f94SNiu Yawei spin_unlock(&dq_data_lock); 1450884d179dSJan Kara /* Drop unused references */ 1451dc52dd3aSDmitry Monakhov dqput_all(got); 1452871a2931SChristoph Hellwig } 1453871a2931SChristoph Hellwig 1454871a2931SChristoph Hellwig void dquot_initialize(struct inode *inode) 1455871a2931SChristoph Hellwig { 1456871a2931SChristoph Hellwig __dquot_initialize(inode, -1); 1457884d179dSJan Kara } 1458884d179dSJan Kara EXPORT_SYMBOL(dquot_initialize); 1459884d179dSJan Kara 1460884d179dSJan Kara /* 1461b9ba6f94SNiu Yawei * Release all quotas referenced by inode. 1462b9ba6f94SNiu Yawei * 1463b9ba6f94SNiu Yawei * This function only be called on inode free or converting 1464b9ba6f94SNiu Yawei * a file to quota file, no other users for the i_dquot in 1465b9ba6f94SNiu Yawei * both cases, so we needn't call synchronize_srcu() after 1466b9ba6f94SNiu Yawei * clearing i_dquot. 1467884d179dSJan Kara */ 14689f754758SChristoph Hellwig static void __dquot_drop(struct inode *inode) 1469884d179dSJan Kara { 1470884d179dSJan Kara int cnt; 1471884d179dSJan Kara struct dquot *put[MAXQUOTAS]; 1472884d179dSJan Kara 1473b9ba6f94SNiu Yawei spin_lock(&dq_data_lock); 1474884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1475884d179dSJan Kara put[cnt] = inode->i_dquot[cnt]; 1476dd6f3c6dSJan Kara inode->i_dquot[cnt] = NULL; 1477884d179dSJan Kara } 1478b9ba6f94SNiu Yawei spin_unlock(&dq_data_lock); 1479dc52dd3aSDmitry Monakhov dqput_all(put); 1480884d179dSJan Kara } 1481884d179dSJan Kara 14829f754758SChristoph Hellwig void dquot_drop(struct inode *inode) 1483884d179dSJan Kara { 1484884d179dSJan Kara int cnt; 14859f754758SChristoph Hellwig 14869f754758SChristoph Hellwig if (IS_NOQUOTA(inode)) 14879f754758SChristoph Hellwig return; 14889f754758SChristoph Hellwig 14899f754758SChristoph Hellwig /* 14909f754758SChristoph Hellwig * Test before calling to rule out calls from proc and such 1491884d179dSJan Kara * where we are not allowed to block. Note that this is 1492884d179dSJan Kara * actually reliable test even without the lock - the caller 1493884d179dSJan Kara * must assure that nobody can come after the DQUOT_DROP and 14949f754758SChristoph Hellwig * add quota pointers back anyway. 14959f754758SChristoph Hellwig */ 14969f754758SChristoph Hellwig for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1497dd6f3c6dSJan Kara if (inode->i_dquot[cnt]) 1498884d179dSJan Kara break; 14999f754758SChristoph Hellwig } 15009f754758SChristoph Hellwig 1501884d179dSJan Kara if (cnt < MAXQUOTAS) 15029f754758SChristoph Hellwig __dquot_drop(inode); 1503884d179dSJan Kara } 15049f754758SChristoph Hellwig EXPORT_SYMBOL(dquot_drop); 1505884d179dSJan Kara 1506884d179dSJan Kara /* 1507fd8fbfc1SDmitry Monakhov * inode_reserved_space is managed internally by quota, and protected by 1508fd8fbfc1SDmitry Monakhov * i_lock similar to i_blocks+i_bytes. 1509fd8fbfc1SDmitry Monakhov */ 1510fd8fbfc1SDmitry Monakhov static qsize_t *inode_reserved_space(struct inode * inode) 1511fd8fbfc1SDmitry Monakhov { 1512fd8fbfc1SDmitry Monakhov /* Filesystem must explicitly define it's own method in order to use 1513fd8fbfc1SDmitry Monakhov * quota reservation interface */ 1514fd8fbfc1SDmitry Monakhov BUG_ON(!inode->i_sb->dq_op->get_reserved_space); 1515fd8fbfc1SDmitry Monakhov return inode->i_sb->dq_op->get_reserved_space(inode); 1516fd8fbfc1SDmitry Monakhov } 1517fd8fbfc1SDmitry Monakhov 1518c469070aSDmitry Monakhov void inode_add_rsv_space(struct inode *inode, qsize_t number) 1519fd8fbfc1SDmitry Monakhov { 1520fd8fbfc1SDmitry Monakhov spin_lock(&inode->i_lock); 1521fd8fbfc1SDmitry Monakhov *inode_reserved_space(inode) += number; 1522fd8fbfc1SDmitry Monakhov spin_unlock(&inode->i_lock); 1523fd8fbfc1SDmitry Monakhov } 1524c469070aSDmitry Monakhov EXPORT_SYMBOL(inode_add_rsv_space); 1525fd8fbfc1SDmitry Monakhov 1526c469070aSDmitry Monakhov void inode_claim_rsv_space(struct inode *inode, qsize_t number) 1527fd8fbfc1SDmitry Monakhov { 1528fd8fbfc1SDmitry Monakhov spin_lock(&inode->i_lock); 1529fd8fbfc1SDmitry Monakhov *inode_reserved_space(inode) -= number; 1530fd8fbfc1SDmitry Monakhov __inode_add_bytes(inode, number); 1531fd8fbfc1SDmitry Monakhov spin_unlock(&inode->i_lock); 1532fd8fbfc1SDmitry Monakhov } 1533c469070aSDmitry Monakhov EXPORT_SYMBOL(inode_claim_rsv_space); 1534fd8fbfc1SDmitry Monakhov 15351c8924ebSJan Kara void inode_reclaim_rsv_space(struct inode *inode, qsize_t number) 15361c8924ebSJan Kara { 15371c8924ebSJan Kara spin_lock(&inode->i_lock); 15381c8924ebSJan Kara *inode_reserved_space(inode) += number; 15391c8924ebSJan Kara __inode_sub_bytes(inode, number); 15401c8924ebSJan Kara spin_unlock(&inode->i_lock); 15411c8924ebSJan Kara } 15421c8924ebSJan Kara EXPORT_SYMBOL(inode_reclaim_rsv_space); 15431c8924ebSJan Kara 1544c469070aSDmitry Monakhov void inode_sub_rsv_space(struct inode *inode, qsize_t number) 1545fd8fbfc1SDmitry Monakhov { 1546fd8fbfc1SDmitry Monakhov spin_lock(&inode->i_lock); 1547fd8fbfc1SDmitry Monakhov *inode_reserved_space(inode) -= number; 1548fd8fbfc1SDmitry Monakhov spin_unlock(&inode->i_lock); 1549fd8fbfc1SDmitry Monakhov } 1550c469070aSDmitry Monakhov EXPORT_SYMBOL(inode_sub_rsv_space); 1551fd8fbfc1SDmitry Monakhov 1552fd8fbfc1SDmitry Monakhov static qsize_t inode_get_rsv_space(struct inode *inode) 1553fd8fbfc1SDmitry Monakhov { 1554fd8fbfc1SDmitry Monakhov qsize_t ret; 155505b5d898SJan Kara 155605b5d898SJan Kara if (!inode->i_sb->dq_op->get_reserved_space) 155705b5d898SJan Kara return 0; 1558fd8fbfc1SDmitry Monakhov spin_lock(&inode->i_lock); 1559fd8fbfc1SDmitry Monakhov ret = *inode_reserved_space(inode); 1560fd8fbfc1SDmitry Monakhov spin_unlock(&inode->i_lock); 1561fd8fbfc1SDmitry Monakhov return ret; 1562fd8fbfc1SDmitry Monakhov } 1563fd8fbfc1SDmitry Monakhov 1564fd8fbfc1SDmitry Monakhov static void inode_incr_space(struct inode *inode, qsize_t number, 1565fd8fbfc1SDmitry Monakhov int reserve) 1566fd8fbfc1SDmitry Monakhov { 1567fd8fbfc1SDmitry Monakhov if (reserve) 1568fd8fbfc1SDmitry Monakhov inode_add_rsv_space(inode, number); 1569fd8fbfc1SDmitry Monakhov else 1570fd8fbfc1SDmitry Monakhov inode_add_bytes(inode, number); 1571fd8fbfc1SDmitry Monakhov } 1572fd8fbfc1SDmitry Monakhov 1573fd8fbfc1SDmitry Monakhov static void inode_decr_space(struct inode *inode, qsize_t number, int reserve) 1574fd8fbfc1SDmitry Monakhov { 1575fd8fbfc1SDmitry Monakhov if (reserve) 1576fd8fbfc1SDmitry Monakhov inode_sub_rsv_space(inode, number); 1577fd8fbfc1SDmitry Monakhov else 1578fd8fbfc1SDmitry Monakhov inode_sub_bytes(inode, number); 1579fd8fbfc1SDmitry Monakhov } 1580fd8fbfc1SDmitry Monakhov 1581fd8fbfc1SDmitry Monakhov /* 15825dd4056dSChristoph Hellwig * This functions updates i_blocks+i_bytes fields and quota information 15835dd4056dSChristoph Hellwig * (together with appropriate checks). 15845dd4056dSChristoph Hellwig * 15855dd4056dSChristoph Hellwig * NOTE: We absolutely rely on the fact that caller dirties the inode 15865dd4056dSChristoph Hellwig * (usually helpers in quotaops.h care about this) and holds a handle for 15875dd4056dSChristoph Hellwig * the current transaction so that dquot write and inode write go into the 15885dd4056dSChristoph Hellwig * same transaction. 1589884d179dSJan Kara */ 1590884d179dSJan Kara 1591884d179dSJan Kara /* 1592884d179dSJan Kara * This operation can block, but only after everything is updated 1593884d179dSJan Kara */ 159456246f9aSEric Sandeen int __dquot_alloc_space(struct inode *inode, qsize_t number, int flags) 1595884d179dSJan Kara { 1596b9ba6f94SNiu Yawei int cnt, ret = 0, index; 1597bf097aafSJan Kara struct dquot_warn warn[MAXQUOTAS]; 1598bf097aafSJan Kara struct dquot **dquots = inode->i_dquot; 159956246f9aSEric Sandeen int reserve = flags & DQUOT_SPACE_RESERVE; 1600884d179dSJan Kara 1601189eef59SChristoph Hellwig if (!dquot_active(inode)) { 1602fd8fbfc1SDmitry Monakhov inode_incr_space(inode, number, reserve); 1603fd8fbfc1SDmitry Monakhov goto out; 1604fd8fbfc1SDmitry Monakhov } 1605fd8fbfc1SDmitry Monakhov 1606884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 1607bf097aafSJan Kara warn[cnt].w_type = QUOTA_NL_NOWARN; 1608884d179dSJan Kara 1609b9ba6f94SNiu Yawei index = srcu_read_lock(&dquot_srcu); 1610884d179dSJan Kara spin_lock(&dq_data_lock); 1611884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1612bf097aafSJan Kara if (!dquots[cnt]) 1613884d179dSJan Kara continue; 1614bf097aafSJan Kara ret = check_bdq(dquots[cnt], number, 1615bf097aafSJan Kara !(flags & DQUOT_SPACE_WARN), &warn[cnt]); 1616bf097aafSJan Kara if (ret && !(flags & DQUOT_SPACE_NOFAIL)) { 1617fd8fbfc1SDmitry Monakhov spin_unlock(&dq_data_lock); 1618fd8fbfc1SDmitry Monakhov goto out_flush_warn; 1619884d179dSJan Kara } 1620884d179dSJan Kara } 1621884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1622bf097aafSJan Kara if (!dquots[cnt]) 1623884d179dSJan Kara continue; 1624884d179dSJan Kara if (reserve) 1625bf097aafSJan Kara dquot_resv_space(dquots[cnt], number); 1626884d179dSJan Kara else 1627bf097aafSJan Kara dquot_incr_space(dquots[cnt], number); 1628884d179dSJan Kara } 1629fd8fbfc1SDmitry Monakhov inode_incr_space(inode, number, reserve); 1630884d179dSJan Kara spin_unlock(&dq_data_lock); 1631fd8fbfc1SDmitry Monakhov 1632fd8fbfc1SDmitry Monakhov if (reserve) 1633fd8fbfc1SDmitry Monakhov goto out_flush_warn; 1634bf097aafSJan Kara mark_all_dquot_dirty(dquots); 1635fd8fbfc1SDmitry Monakhov out_flush_warn: 1636b9ba6f94SNiu Yawei srcu_read_unlock(&dquot_srcu, index); 1637bf097aafSJan Kara flush_warnings(warn); 1638fd8fbfc1SDmitry Monakhov out: 1639884d179dSJan Kara return ret; 1640884d179dSJan Kara } 16415dd4056dSChristoph Hellwig EXPORT_SYMBOL(__dquot_alloc_space); 1642884d179dSJan Kara 1643884d179dSJan Kara /* 1644884d179dSJan Kara * This operation can block, but only after everything is updated 1645884d179dSJan Kara */ 164663936ddaSChristoph Hellwig int dquot_alloc_inode(const struct inode *inode) 1647884d179dSJan Kara { 1648b9ba6f94SNiu Yawei int cnt, ret = 0, index; 1649bf097aafSJan Kara struct dquot_warn warn[MAXQUOTAS]; 1650bf097aafSJan Kara struct dquot * const *dquots = inode->i_dquot; 1651884d179dSJan Kara 1652189eef59SChristoph Hellwig if (!dquot_active(inode)) 165363936ddaSChristoph Hellwig return 0; 1654884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 1655bf097aafSJan Kara warn[cnt].w_type = QUOTA_NL_NOWARN; 1656b9ba6f94SNiu Yawei 1657b9ba6f94SNiu Yawei index = srcu_read_lock(&dquot_srcu); 1658884d179dSJan Kara spin_lock(&dq_data_lock); 1659884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1660bf097aafSJan Kara if (!dquots[cnt]) 1661884d179dSJan Kara continue; 1662bf097aafSJan Kara ret = check_idq(dquots[cnt], 1, &warn[cnt]); 1663efd8f0e6SChristoph Hellwig if (ret) 1664884d179dSJan Kara goto warn_put_all; 1665884d179dSJan Kara } 1666884d179dSJan Kara 1667884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1668bf097aafSJan Kara if (!dquots[cnt]) 1669884d179dSJan Kara continue; 1670bf097aafSJan Kara dquot_incr_inodes(dquots[cnt], 1); 1671884d179dSJan Kara } 1672efd8f0e6SChristoph Hellwig 1673884d179dSJan Kara warn_put_all: 1674884d179dSJan Kara spin_unlock(&dq_data_lock); 167563936ddaSChristoph Hellwig if (ret == 0) 1676bf097aafSJan Kara mark_all_dquot_dirty(dquots); 1677b9ba6f94SNiu Yawei srcu_read_unlock(&dquot_srcu, index); 1678bf097aafSJan Kara flush_warnings(warn); 1679884d179dSJan Kara return ret; 1680884d179dSJan Kara } 1681884d179dSJan Kara EXPORT_SYMBOL(dquot_alloc_inode); 1682884d179dSJan Kara 16835dd4056dSChristoph Hellwig /* 16845dd4056dSChristoph Hellwig * Convert in-memory reserved quotas to real consumed quotas 16855dd4056dSChristoph Hellwig */ 16865dd4056dSChristoph Hellwig int dquot_claim_space_nodirty(struct inode *inode, qsize_t number) 1687884d179dSJan Kara { 1688b9ba6f94SNiu Yawei int cnt, index; 1689884d179dSJan Kara 1690189eef59SChristoph Hellwig if (!dquot_active(inode)) { 1691fd8fbfc1SDmitry Monakhov inode_claim_rsv_space(inode, number); 16925dd4056dSChristoph Hellwig return 0; 1693884d179dSJan Kara } 1694884d179dSJan Kara 1695b9ba6f94SNiu Yawei index = srcu_read_lock(&dquot_srcu); 1696884d179dSJan Kara spin_lock(&dq_data_lock); 1697884d179dSJan Kara /* Claim reserved quotas to allocated quotas */ 1698884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1699dd6f3c6dSJan Kara if (inode->i_dquot[cnt]) 1700884d179dSJan Kara dquot_claim_reserved_space(inode->i_dquot[cnt], 1701884d179dSJan Kara number); 1702884d179dSJan Kara } 1703884d179dSJan Kara /* Update inode bytes */ 1704fd8fbfc1SDmitry Monakhov inode_claim_rsv_space(inode, number); 1705884d179dSJan Kara spin_unlock(&dq_data_lock); 1706dc52dd3aSDmitry Monakhov mark_all_dquot_dirty(inode->i_dquot); 1707b9ba6f94SNiu Yawei srcu_read_unlock(&dquot_srcu, index); 17085dd4056dSChristoph Hellwig return 0; 1709884d179dSJan Kara } 17105dd4056dSChristoph Hellwig EXPORT_SYMBOL(dquot_claim_space_nodirty); 1711884d179dSJan Kara 1712884d179dSJan Kara /* 17131c8924ebSJan Kara * Convert allocated space back to in-memory reserved quotas 17141c8924ebSJan Kara */ 17151c8924ebSJan Kara void dquot_reclaim_space_nodirty(struct inode *inode, qsize_t number) 17161c8924ebSJan Kara { 1717b9ba6f94SNiu Yawei int cnt, index; 17181c8924ebSJan Kara 17191c8924ebSJan Kara if (!dquot_active(inode)) { 17201c8924ebSJan Kara inode_reclaim_rsv_space(inode, number); 17211c8924ebSJan Kara return; 17221c8924ebSJan Kara } 17231c8924ebSJan Kara 1724b9ba6f94SNiu Yawei index = srcu_read_lock(&dquot_srcu); 17251c8924ebSJan Kara spin_lock(&dq_data_lock); 17261c8924ebSJan Kara /* Claim reserved quotas to allocated quotas */ 17271c8924ebSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 17281c8924ebSJan Kara if (inode->i_dquot[cnt]) 17291c8924ebSJan Kara dquot_reclaim_reserved_space(inode->i_dquot[cnt], 17301c8924ebSJan Kara number); 17311c8924ebSJan Kara } 17321c8924ebSJan Kara /* Update inode bytes */ 17331c8924ebSJan Kara inode_reclaim_rsv_space(inode, number); 17341c8924ebSJan Kara spin_unlock(&dq_data_lock); 17351c8924ebSJan Kara mark_all_dquot_dirty(inode->i_dquot); 1736b9ba6f94SNiu Yawei srcu_read_unlock(&dquot_srcu, index); 17371c8924ebSJan Kara return; 17381c8924ebSJan Kara } 17391c8924ebSJan Kara EXPORT_SYMBOL(dquot_reclaim_space_nodirty); 17401c8924ebSJan Kara 17411c8924ebSJan Kara /* 1742884d179dSJan Kara * This operation can block, but only after everything is updated 1743884d179dSJan Kara */ 174456246f9aSEric Sandeen void __dquot_free_space(struct inode *inode, qsize_t number, int flags) 1745884d179dSJan Kara { 1746884d179dSJan Kara unsigned int cnt; 1747bf097aafSJan Kara struct dquot_warn warn[MAXQUOTAS]; 1748bf097aafSJan Kara struct dquot **dquots = inode->i_dquot; 1749b9ba6f94SNiu Yawei int reserve = flags & DQUOT_SPACE_RESERVE, index; 1750884d179dSJan Kara 1751189eef59SChristoph Hellwig if (!dquot_active(inode)) { 1752fd8fbfc1SDmitry Monakhov inode_decr_space(inode, number, reserve); 17535dd4056dSChristoph Hellwig return; 1754884d179dSJan Kara } 1755884d179dSJan Kara 1756b9ba6f94SNiu Yawei index = srcu_read_lock(&dquot_srcu); 1757884d179dSJan Kara spin_lock(&dq_data_lock); 1758884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1759bf097aafSJan Kara int wtype; 1760bf097aafSJan Kara 1761bf097aafSJan Kara warn[cnt].w_type = QUOTA_NL_NOWARN; 1762bf097aafSJan Kara if (!dquots[cnt]) 1763884d179dSJan Kara continue; 1764bf097aafSJan Kara wtype = info_bdq_free(dquots[cnt], number); 1765bf097aafSJan Kara if (wtype != QUOTA_NL_NOWARN) 1766bf097aafSJan Kara prepare_warning(&warn[cnt], dquots[cnt], wtype); 1767fd8fbfc1SDmitry Monakhov if (reserve) 1768bf097aafSJan Kara dquot_free_reserved_space(dquots[cnt], number); 1769fd8fbfc1SDmitry Monakhov else 1770bf097aafSJan Kara dquot_decr_space(dquots[cnt], number); 1771884d179dSJan Kara } 1772fd8fbfc1SDmitry Monakhov inode_decr_space(inode, number, reserve); 1773884d179dSJan Kara spin_unlock(&dq_data_lock); 1774fd8fbfc1SDmitry Monakhov 1775fd8fbfc1SDmitry Monakhov if (reserve) 1776fd8fbfc1SDmitry Monakhov goto out_unlock; 1777bf097aafSJan Kara mark_all_dquot_dirty(dquots); 1778fd8fbfc1SDmitry Monakhov out_unlock: 1779b9ba6f94SNiu Yawei srcu_read_unlock(&dquot_srcu, index); 1780bf097aafSJan Kara flush_warnings(warn); 1781884d179dSJan Kara } 17825dd4056dSChristoph Hellwig EXPORT_SYMBOL(__dquot_free_space); 1783fd8fbfc1SDmitry Monakhov 1784fd8fbfc1SDmitry Monakhov /* 1785884d179dSJan Kara * This operation can block, but only after everything is updated 1786884d179dSJan Kara */ 178763936ddaSChristoph Hellwig void dquot_free_inode(const struct inode *inode) 1788884d179dSJan Kara { 1789884d179dSJan Kara unsigned int cnt; 1790bf097aafSJan Kara struct dquot_warn warn[MAXQUOTAS]; 1791bf097aafSJan Kara struct dquot * const *dquots = inode->i_dquot; 1792b9ba6f94SNiu Yawei int index; 1793884d179dSJan Kara 1794189eef59SChristoph Hellwig if (!dquot_active(inode)) 179563936ddaSChristoph Hellwig return; 1796884d179dSJan Kara 1797b9ba6f94SNiu Yawei index = srcu_read_lock(&dquot_srcu); 1798884d179dSJan Kara spin_lock(&dq_data_lock); 1799884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1800bf097aafSJan Kara int wtype; 1801bf097aafSJan Kara 1802bf097aafSJan Kara warn[cnt].w_type = QUOTA_NL_NOWARN; 1803bf097aafSJan Kara if (!dquots[cnt]) 1804884d179dSJan Kara continue; 1805bf097aafSJan Kara wtype = info_idq_free(dquots[cnt], 1); 1806bf097aafSJan Kara if (wtype != QUOTA_NL_NOWARN) 1807bf097aafSJan Kara prepare_warning(&warn[cnt], dquots[cnt], wtype); 1808bf097aafSJan Kara dquot_decr_inodes(dquots[cnt], 1); 1809884d179dSJan Kara } 1810884d179dSJan Kara spin_unlock(&dq_data_lock); 1811bf097aafSJan Kara mark_all_dquot_dirty(dquots); 1812b9ba6f94SNiu Yawei srcu_read_unlock(&dquot_srcu, index); 1813bf097aafSJan Kara flush_warnings(warn); 1814884d179dSJan Kara } 1815884d179dSJan Kara EXPORT_SYMBOL(dquot_free_inode); 1816884d179dSJan Kara 1817884d179dSJan Kara /* 1818884d179dSJan Kara * Transfer the number of inode and blocks from one diskquota to an other. 1819bc8e5f07SJan Kara * On success, dquot references in transfer_to are consumed and references 1820bc8e5f07SJan Kara * to original dquots that need to be released are placed there. On failure, 1821bc8e5f07SJan Kara * references are kept untouched. 1822884d179dSJan Kara * 1823884d179dSJan Kara * This operation can block, but only after everything is updated 1824884d179dSJan Kara * A transaction must be started when entering this function. 1825bc8e5f07SJan Kara * 1826b9ba6f94SNiu Yawei * We are holding reference on transfer_from & transfer_to, no need to 1827b9ba6f94SNiu Yawei * protect them by srcu_read_lock(). 1828884d179dSJan Kara */ 1829bc8e5f07SJan Kara int __dquot_transfer(struct inode *inode, struct dquot **transfer_to) 1830884d179dSJan Kara { 1831884d179dSJan Kara qsize_t space, cur_space; 1832884d179dSJan Kara qsize_t rsv_space = 0; 1833bc8e5f07SJan Kara struct dquot *transfer_from[MAXQUOTAS] = {}; 1834efd8f0e6SChristoph Hellwig int cnt, ret = 0; 18359e32784bSDmitry char is_valid[MAXQUOTAS] = {}; 1836bf097aafSJan Kara struct dquot_warn warn_to[MAXQUOTAS]; 1837bf097aafSJan Kara struct dquot_warn warn_from_inodes[MAXQUOTAS]; 1838bf097aafSJan Kara struct dquot_warn warn_from_space[MAXQUOTAS]; 1839884d179dSJan Kara 1840884d179dSJan Kara if (IS_NOQUOTA(inode)) 1841efd8f0e6SChristoph Hellwig return 0; 1842884d179dSJan Kara /* Initialize the arrays */ 1843bf097aafSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1844bf097aafSJan Kara warn_to[cnt].w_type = QUOTA_NL_NOWARN; 1845bf097aafSJan Kara warn_from_inodes[cnt].w_type = QUOTA_NL_NOWARN; 1846bf097aafSJan Kara warn_from_space[cnt].w_type = QUOTA_NL_NOWARN; 1847bf097aafSJan Kara } 1848b9ba6f94SNiu Yawei 1849b9ba6f94SNiu Yawei spin_lock(&dq_data_lock); 1850884d179dSJan Kara if (IS_NOQUOTA(inode)) { /* File without quota accounting? */ 1851b9ba6f94SNiu Yawei spin_unlock(&dq_data_lock); 1852bc8e5f07SJan Kara return 0; 1853884d179dSJan Kara } 1854884d179dSJan Kara cur_space = inode_get_bytes(inode); 1855fd8fbfc1SDmitry Monakhov rsv_space = inode_get_rsv_space(inode); 1856884d179dSJan Kara space = cur_space + rsv_space; 1857884d179dSJan Kara /* Build the transfer_from list and check the limits */ 1858884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 18599e32784bSDmitry /* 18609e32784bSDmitry * Skip changes for same uid or gid or for turned off quota-type. 18619e32784bSDmitry */ 1862dd6f3c6dSJan Kara if (!transfer_to[cnt]) 1863884d179dSJan Kara continue; 18649e32784bSDmitry /* Avoid races with quotaoff() */ 18659e32784bSDmitry if (!sb_has_quota_active(inode->i_sb, cnt)) 18669e32784bSDmitry continue; 18679e32784bSDmitry is_valid[cnt] = 1; 1868884d179dSJan Kara transfer_from[cnt] = inode->i_dquot[cnt]; 1869bf097aafSJan Kara ret = check_idq(transfer_to[cnt], 1, &warn_to[cnt]); 1870efd8f0e6SChristoph Hellwig if (ret) 1871efd8f0e6SChristoph Hellwig goto over_quota; 1872bf097aafSJan Kara ret = check_bdq(transfer_to[cnt], space, 0, &warn_to[cnt]); 1873efd8f0e6SChristoph Hellwig if (ret) 1874884d179dSJan Kara goto over_quota; 1875884d179dSJan Kara } 1876884d179dSJan Kara 1877884d179dSJan Kara /* 1878884d179dSJan Kara * Finally perform the needed transfer from transfer_from to transfer_to 1879884d179dSJan Kara */ 1880884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 18819e32784bSDmitry if (!is_valid[cnt]) 1882884d179dSJan Kara continue; 1883884d179dSJan Kara /* Due to IO error we might not have transfer_from[] structure */ 1884884d179dSJan Kara if (transfer_from[cnt]) { 1885bf097aafSJan Kara int wtype; 1886bf097aafSJan Kara wtype = info_idq_free(transfer_from[cnt], 1); 1887bf097aafSJan Kara if (wtype != QUOTA_NL_NOWARN) 1888bf097aafSJan Kara prepare_warning(&warn_from_inodes[cnt], 1889bf097aafSJan Kara transfer_from[cnt], wtype); 1890bf097aafSJan Kara wtype = info_bdq_free(transfer_from[cnt], space); 1891bf097aafSJan Kara if (wtype != QUOTA_NL_NOWARN) 1892bf097aafSJan Kara prepare_warning(&warn_from_space[cnt], 1893bf097aafSJan Kara transfer_from[cnt], wtype); 1894884d179dSJan Kara dquot_decr_inodes(transfer_from[cnt], 1); 1895884d179dSJan Kara dquot_decr_space(transfer_from[cnt], cur_space); 1896884d179dSJan Kara dquot_free_reserved_space(transfer_from[cnt], 1897884d179dSJan Kara rsv_space); 1898884d179dSJan Kara } 1899884d179dSJan Kara 1900884d179dSJan Kara dquot_incr_inodes(transfer_to[cnt], 1); 1901884d179dSJan Kara dquot_incr_space(transfer_to[cnt], cur_space); 1902884d179dSJan Kara dquot_resv_space(transfer_to[cnt], rsv_space); 1903884d179dSJan Kara 1904884d179dSJan Kara inode->i_dquot[cnt] = transfer_to[cnt]; 1905884d179dSJan Kara } 1906884d179dSJan Kara spin_unlock(&dq_data_lock); 1907884d179dSJan Kara 1908dc52dd3aSDmitry Monakhov mark_all_dquot_dirty(transfer_from); 1909dc52dd3aSDmitry Monakhov mark_all_dquot_dirty(transfer_to); 1910bf097aafSJan Kara flush_warnings(warn_to); 1911bf097aafSJan Kara flush_warnings(warn_from_inodes); 1912bf097aafSJan Kara flush_warnings(warn_from_space); 1913bc8e5f07SJan Kara /* Pass back references to put */ 1914dc52dd3aSDmitry Monakhov for (cnt = 0; cnt < MAXQUOTAS; cnt++) 19159e32784bSDmitry if (is_valid[cnt]) 1916bc8e5f07SJan Kara transfer_to[cnt] = transfer_from[cnt]; 191786f3cbecSJan Kara return 0; 1918884d179dSJan Kara over_quota: 1919884d179dSJan Kara spin_unlock(&dq_data_lock); 1920bf097aafSJan Kara flush_warnings(warn_to); 192186f3cbecSJan Kara return ret; 1922884d179dSJan Kara } 1923bc8e5f07SJan Kara EXPORT_SYMBOL(__dquot_transfer); 1924884d179dSJan Kara 19258ddd69d6SDmitry Monakhov /* Wrapper for transferring ownership of an inode for uid/gid only 19268ddd69d6SDmitry Monakhov * Called from FSXXX_setattr() 19278ddd69d6SDmitry Monakhov */ 1928b43fa828SChristoph Hellwig int dquot_transfer(struct inode *inode, struct iattr *iattr) 1929884d179dSJan Kara { 1930bc8e5f07SJan Kara struct dquot *transfer_to[MAXQUOTAS] = {}; 1931bc8e5f07SJan Kara struct super_block *sb = inode->i_sb; 1932bc8e5f07SJan Kara int ret; 19338ddd69d6SDmitry Monakhov 1934189eef59SChristoph Hellwig if (!dquot_active(inode)) 1935884d179dSJan Kara return 0; 1936bc8e5f07SJan Kara 19371a06d420SEric W. Biederman if (iattr->ia_valid & ATTR_UID && !uid_eq(iattr->ia_uid, inode->i_uid)) 1938aca645a6SEric W. Biederman transfer_to[USRQUOTA] = dqget(sb, make_kqid_uid(iattr->ia_uid)); 19391a06d420SEric W. Biederman if (iattr->ia_valid & ATTR_GID && !gid_eq(iattr->ia_gid, inode->i_gid)) 1940aca645a6SEric W. Biederman transfer_to[GRPQUOTA] = dqget(sb, make_kqid_gid(iattr->ia_gid)); 1941bc8e5f07SJan Kara 1942bc8e5f07SJan Kara ret = __dquot_transfer(inode, transfer_to); 1943bc8e5f07SJan Kara dqput_all(transfer_to); 1944bc8e5f07SJan Kara return ret; 1945884d179dSJan Kara } 1946b43fa828SChristoph Hellwig EXPORT_SYMBOL(dquot_transfer); 1947884d179dSJan Kara 1948884d179dSJan Kara /* 1949884d179dSJan Kara * Write info of quota file to disk 1950884d179dSJan Kara */ 1951884d179dSJan Kara int dquot_commit_info(struct super_block *sb, int type) 1952884d179dSJan Kara { 1953884d179dSJan Kara int ret; 1954884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 1955884d179dSJan Kara 1956884d179dSJan Kara mutex_lock(&dqopt->dqio_mutex); 1957884d179dSJan Kara ret = dqopt->ops[type]->write_file_info(sb, type); 1958884d179dSJan Kara mutex_unlock(&dqopt->dqio_mutex); 1959884d179dSJan Kara return ret; 1960884d179dSJan Kara } 1961884d179dSJan Kara EXPORT_SYMBOL(dquot_commit_info); 1962884d179dSJan Kara 1963884d179dSJan Kara /* 1964884d179dSJan Kara * Definitions of diskquota operations. 1965884d179dSJan Kara */ 196661e225dcSAlexey Dobriyan const struct dquot_operations dquot_operations = { 1967884d179dSJan Kara .write_dquot = dquot_commit, 1968884d179dSJan Kara .acquire_dquot = dquot_acquire, 1969884d179dSJan Kara .release_dquot = dquot_release, 1970884d179dSJan Kara .mark_dirty = dquot_mark_dquot_dirty, 1971884d179dSJan Kara .write_info = dquot_commit_info, 1972884d179dSJan Kara .alloc_dquot = dquot_alloc, 1973884d179dSJan Kara .destroy_dquot = dquot_destroy, 1974884d179dSJan Kara }; 1975123e9cafSChristoph Hellwig EXPORT_SYMBOL(dquot_operations); 1976884d179dSJan Kara 1977884d179dSJan Kara /* 1978907f4554SChristoph Hellwig * Generic helper for ->open on filesystems supporting disk quotas. 1979907f4554SChristoph Hellwig */ 1980907f4554SChristoph Hellwig int dquot_file_open(struct inode *inode, struct file *file) 1981907f4554SChristoph Hellwig { 1982907f4554SChristoph Hellwig int error; 1983907f4554SChristoph Hellwig 1984907f4554SChristoph Hellwig error = generic_file_open(inode, file); 1985907f4554SChristoph Hellwig if (!error && (file->f_mode & FMODE_WRITE)) 1986871a2931SChristoph Hellwig dquot_initialize(inode); 1987907f4554SChristoph Hellwig return error; 1988907f4554SChristoph Hellwig } 1989907f4554SChristoph Hellwig EXPORT_SYMBOL(dquot_file_open); 1990907f4554SChristoph Hellwig 1991907f4554SChristoph Hellwig /* 1992884d179dSJan Kara * Turn quota off on a device. type == -1 ==> quotaoff for all types (umount) 1993884d179dSJan Kara */ 19940f0dd62fSChristoph Hellwig int dquot_disable(struct super_block *sb, int type, unsigned int flags) 1995884d179dSJan Kara { 1996884d179dSJan Kara int cnt, ret = 0; 1997884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 1998884d179dSJan Kara struct inode *toputinode[MAXQUOTAS]; 1999884d179dSJan Kara 2000884d179dSJan Kara /* Cannot turn off usage accounting without turning off limits, or 2001884d179dSJan Kara * suspend quotas and simultaneously turn quotas off. */ 2002884d179dSJan Kara if ((flags & DQUOT_USAGE_ENABLED && !(flags & DQUOT_LIMITS_ENABLED)) 2003884d179dSJan Kara || (flags & DQUOT_SUSPENDED && flags & (DQUOT_LIMITS_ENABLED | 2004884d179dSJan Kara DQUOT_USAGE_ENABLED))) 2005884d179dSJan Kara return -EINVAL; 2006884d179dSJan Kara 2007884d179dSJan Kara /* We need to serialize quota_off() for device */ 2008884d179dSJan Kara mutex_lock(&dqopt->dqonoff_mutex); 2009884d179dSJan Kara 2010884d179dSJan Kara /* 2011884d179dSJan Kara * Skip everything if there's nothing to do. We have to do this because 2012884d179dSJan Kara * sometimes we are called when fill_super() failed and calling 2013884d179dSJan Kara * sync_fs() in such cases does no good. 2014884d179dSJan Kara */ 2015884d179dSJan Kara if (!sb_any_quota_loaded(sb)) { 2016884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 2017884d179dSJan Kara return 0; 2018884d179dSJan Kara } 2019884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 2020884d179dSJan Kara toputinode[cnt] = NULL; 2021884d179dSJan Kara if (type != -1 && cnt != type) 2022884d179dSJan Kara continue; 2023884d179dSJan Kara if (!sb_has_quota_loaded(sb, cnt)) 2024884d179dSJan Kara continue; 2025884d179dSJan Kara 2026884d179dSJan Kara if (flags & DQUOT_SUSPENDED) { 2027884d179dSJan Kara spin_lock(&dq_state_lock); 2028884d179dSJan Kara dqopt->flags |= 2029884d179dSJan Kara dquot_state_flag(DQUOT_SUSPENDED, cnt); 2030884d179dSJan Kara spin_unlock(&dq_state_lock); 2031884d179dSJan Kara } else { 2032884d179dSJan Kara spin_lock(&dq_state_lock); 2033884d179dSJan Kara dqopt->flags &= ~dquot_state_flag(flags, cnt); 2034884d179dSJan Kara /* Turning off suspended quotas? */ 2035884d179dSJan Kara if (!sb_has_quota_loaded(sb, cnt) && 2036884d179dSJan Kara sb_has_quota_suspended(sb, cnt)) { 2037884d179dSJan Kara dqopt->flags &= ~dquot_state_flag( 2038884d179dSJan Kara DQUOT_SUSPENDED, cnt); 2039884d179dSJan Kara spin_unlock(&dq_state_lock); 2040884d179dSJan Kara iput(dqopt->files[cnt]); 2041884d179dSJan Kara dqopt->files[cnt] = NULL; 2042884d179dSJan Kara continue; 2043884d179dSJan Kara } 2044884d179dSJan Kara spin_unlock(&dq_state_lock); 2045884d179dSJan Kara } 2046884d179dSJan Kara 2047884d179dSJan Kara /* We still have to keep quota loaded? */ 2048884d179dSJan Kara if (sb_has_quota_loaded(sb, cnt) && !(flags & DQUOT_SUSPENDED)) 2049884d179dSJan Kara continue; 2050884d179dSJan Kara 2051884d179dSJan Kara /* Note: these are blocking operations */ 2052884d179dSJan Kara drop_dquot_ref(sb, cnt); 2053884d179dSJan Kara invalidate_dquots(sb, cnt); 2054884d179dSJan Kara /* 2055268157baSJan Kara * Now all dquots should be invalidated, all writes done so we 2056268157baSJan Kara * should be only users of the info. No locks needed. 2057884d179dSJan Kara */ 2058884d179dSJan Kara if (info_dirty(&dqopt->info[cnt])) 2059884d179dSJan Kara sb->dq_op->write_info(sb, cnt); 2060884d179dSJan Kara if (dqopt->ops[cnt]->free_file_info) 2061884d179dSJan Kara dqopt->ops[cnt]->free_file_info(sb, cnt); 2062884d179dSJan Kara put_quota_format(dqopt->info[cnt].dqi_format); 2063884d179dSJan Kara 2064884d179dSJan Kara toputinode[cnt] = dqopt->files[cnt]; 2065884d179dSJan Kara if (!sb_has_quota_loaded(sb, cnt)) 2066884d179dSJan Kara dqopt->files[cnt] = NULL; 2067884d179dSJan Kara dqopt->info[cnt].dqi_flags = 0; 2068884d179dSJan Kara dqopt->info[cnt].dqi_igrace = 0; 2069884d179dSJan Kara dqopt->info[cnt].dqi_bgrace = 0; 2070884d179dSJan Kara dqopt->ops[cnt] = NULL; 2071884d179dSJan Kara } 2072884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 2073884d179dSJan Kara 2074884d179dSJan Kara /* Skip syncing and setting flags if quota files are hidden */ 2075884d179dSJan Kara if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) 2076884d179dSJan Kara goto put_inodes; 2077884d179dSJan Kara 2078884d179dSJan Kara /* Sync the superblock so that buffers with quota data are written to 2079884d179dSJan Kara * disk (and so userspace sees correct data afterwards). */ 2080884d179dSJan Kara if (sb->s_op->sync_fs) 2081884d179dSJan Kara sb->s_op->sync_fs(sb, 1); 2082884d179dSJan Kara sync_blockdev(sb->s_bdev); 2083884d179dSJan Kara /* Now the quota files are just ordinary files and we can set the 2084884d179dSJan Kara * inode flags back. Moreover we discard the pagecache so that 2085884d179dSJan Kara * userspace sees the writes we did bypassing the pagecache. We 2086884d179dSJan Kara * must also discard the blockdev buffers so that we see the 2087884d179dSJan Kara * changes done by userspace on the next quotaon() */ 2088884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 2089884d179dSJan Kara if (toputinode[cnt]) { 2090884d179dSJan Kara mutex_lock(&dqopt->dqonoff_mutex); 2091884d179dSJan Kara /* If quota was reenabled in the meantime, we have 2092884d179dSJan Kara * nothing to do */ 2093884d179dSJan Kara if (!sb_has_quota_loaded(sb, cnt)) { 2094a80b12c3SJan Kara mutex_lock(&toputinode[cnt]->i_mutex); 2095884d179dSJan Kara toputinode[cnt]->i_flags &= ~(S_IMMUTABLE | 2096884d179dSJan Kara S_NOATIME | S_NOQUOTA); 2097268157baSJan Kara truncate_inode_pages(&toputinode[cnt]->i_data, 2098268157baSJan Kara 0); 2099884d179dSJan Kara mutex_unlock(&toputinode[cnt]->i_mutex); 210043d2932dSJan Kara mark_inode_dirty_sync(toputinode[cnt]); 2101884d179dSJan Kara } 2102884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 2103884d179dSJan Kara } 2104884d179dSJan Kara if (sb->s_bdev) 2105884d179dSJan Kara invalidate_bdev(sb->s_bdev); 2106884d179dSJan Kara put_inodes: 2107884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 2108884d179dSJan Kara if (toputinode[cnt]) { 2109884d179dSJan Kara /* On remount RO, we keep the inode pointer so that we 2110884d179dSJan Kara * can reenable quota on the subsequent remount RW. We 2111884d179dSJan Kara * have to check 'flags' variable and not use sb_has_ 2112884d179dSJan Kara * function because another quotaon / quotaoff could 2113884d179dSJan Kara * change global state before we got here. We refuse 2114884d179dSJan Kara * to suspend quotas when there is pending delete on 2115884d179dSJan Kara * the quota file... */ 2116884d179dSJan Kara if (!(flags & DQUOT_SUSPENDED)) 2117884d179dSJan Kara iput(toputinode[cnt]); 2118884d179dSJan Kara else if (!toputinode[cnt]->i_nlink) 2119884d179dSJan Kara ret = -EBUSY; 2120884d179dSJan Kara } 2121884d179dSJan Kara return ret; 2122884d179dSJan Kara } 21230f0dd62fSChristoph Hellwig EXPORT_SYMBOL(dquot_disable); 2124884d179dSJan Kara 2125287a8095SChristoph Hellwig int dquot_quota_off(struct super_block *sb, int type) 2126884d179dSJan Kara { 21270f0dd62fSChristoph Hellwig return dquot_disable(sb, type, 21280f0dd62fSChristoph Hellwig DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); 2129884d179dSJan Kara } 2130287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_quota_off); 21310f0dd62fSChristoph Hellwig 2132884d179dSJan Kara /* 2133884d179dSJan Kara * Turn quotas on on a device 2134884d179dSJan Kara */ 2135884d179dSJan Kara 2136884d179dSJan Kara /* 2137884d179dSJan Kara * Helper function to turn quotas on when we already have the inode of 2138884d179dSJan Kara * quota file and no quota information is loaded. 2139884d179dSJan Kara */ 2140884d179dSJan Kara static int vfs_load_quota_inode(struct inode *inode, int type, int format_id, 2141884d179dSJan Kara unsigned int flags) 2142884d179dSJan Kara { 2143884d179dSJan Kara struct quota_format_type *fmt = find_quota_format(format_id); 2144884d179dSJan Kara struct super_block *sb = inode->i_sb; 2145884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 2146884d179dSJan Kara int error; 2147884d179dSJan Kara int oldflags = -1; 2148884d179dSJan Kara 2149884d179dSJan Kara if (!fmt) 2150884d179dSJan Kara return -ESRCH; 2151884d179dSJan Kara if (!S_ISREG(inode->i_mode)) { 2152884d179dSJan Kara error = -EACCES; 2153884d179dSJan Kara goto out_fmt; 2154884d179dSJan Kara } 2155884d179dSJan Kara if (IS_RDONLY(inode)) { 2156884d179dSJan Kara error = -EROFS; 2157884d179dSJan Kara goto out_fmt; 2158884d179dSJan Kara } 2159884d179dSJan Kara if (!sb->s_op->quota_write || !sb->s_op->quota_read) { 2160884d179dSJan Kara error = -EINVAL; 2161884d179dSJan Kara goto out_fmt; 2162884d179dSJan Kara } 2163884d179dSJan Kara /* Usage always has to be set... */ 2164884d179dSJan Kara if (!(flags & DQUOT_USAGE_ENABLED)) { 2165884d179dSJan Kara error = -EINVAL; 2166884d179dSJan Kara goto out_fmt; 2167884d179dSJan Kara } 2168884d179dSJan Kara 2169884d179dSJan Kara if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) { 2170ab94c39bSJan Kara /* As we bypass the pagecache we must now flush all the 2171ab94c39bSJan Kara * dirty data and invalidate caches so that kernel sees 2172ab94c39bSJan Kara * changes from userspace. It is not enough to just flush 2173ab94c39bSJan Kara * the quota file since if blocksize < pagesize, invalidation 2174ab94c39bSJan Kara * of the cache could fail because of other unrelated dirty 2175ab94c39bSJan Kara * data */ 2176ab94c39bSJan Kara sync_filesystem(sb); 2177884d179dSJan Kara invalidate_bdev(sb->s_bdev); 2178884d179dSJan Kara } 2179884d179dSJan Kara mutex_lock(&dqopt->dqonoff_mutex); 2180884d179dSJan Kara if (sb_has_quota_loaded(sb, type)) { 2181884d179dSJan Kara error = -EBUSY; 2182884d179dSJan Kara goto out_lock; 2183884d179dSJan Kara } 2184884d179dSJan Kara 2185884d179dSJan Kara if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) { 2186884d179dSJan Kara /* We don't want quota and atime on quota files (deadlocks 2187884d179dSJan Kara * possible) Also nobody should write to the file - we use 2188884d179dSJan Kara * special IO operations which ignore the immutable bit. */ 2189a80b12c3SJan Kara mutex_lock(&inode->i_mutex); 2190268157baSJan Kara oldflags = inode->i_flags & (S_NOATIME | S_IMMUTABLE | 2191268157baSJan Kara S_NOQUOTA); 2192884d179dSJan Kara inode->i_flags |= S_NOQUOTA | S_NOATIME | S_IMMUTABLE; 2193dee86565SJan Kara mutex_unlock(&inode->i_mutex); 219426245c94SJan Kara /* 219526245c94SJan Kara * When S_NOQUOTA is set, remove dquot references as no more 219626245c94SJan Kara * references can be added 219726245c94SJan Kara */ 21989f754758SChristoph Hellwig __dquot_drop(inode); 2199884d179dSJan Kara } 2200884d179dSJan Kara 2201884d179dSJan Kara error = -EIO; 2202884d179dSJan Kara dqopt->files[type] = igrab(inode); 2203884d179dSJan Kara if (!dqopt->files[type]) 2204884d179dSJan Kara goto out_lock; 2205884d179dSJan Kara error = -EINVAL; 2206884d179dSJan Kara if (!fmt->qf_ops->check_quota_file(sb, type)) 2207884d179dSJan Kara goto out_file_init; 2208884d179dSJan Kara 2209884d179dSJan Kara dqopt->ops[type] = fmt->qf_ops; 2210884d179dSJan Kara dqopt->info[type].dqi_format = fmt; 2211884d179dSJan Kara dqopt->info[type].dqi_fmt_id = format_id; 2212884d179dSJan Kara INIT_LIST_HEAD(&dqopt->info[type].dqi_dirty_list); 2213884d179dSJan Kara mutex_lock(&dqopt->dqio_mutex); 2214268157baSJan Kara error = dqopt->ops[type]->read_file_info(sb, type); 2215268157baSJan Kara if (error < 0) { 2216884d179dSJan Kara mutex_unlock(&dqopt->dqio_mutex); 2217884d179dSJan Kara goto out_file_init; 2218884d179dSJan Kara } 221946fe44ceSJan Kara if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) 222046fe44ceSJan Kara dqopt->info[type].dqi_flags |= DQF_SYS_FILE; 2221884d179dSJan Kara mutex_unlock(&dqopt->dqio_mutex); 2222884d179dSJan Kara spin_lock(&dq_state_lock); 2223884d179dSJan Kara dqopt->flags |= dquot_state_flag(flags, type); 2224884d179dSJan Kara spin_unlock(&dq_state_lock); 2225884d179dSJan Kara 2226884d179dSJan Kara add_dquot_ref(sb, type); 2227884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 2228884d179dSJan Kara 2229884d179dSJan Kara return 0; 2230884d179dSJan Kara 2231884d179dSJan Kara out_file_init: 2232884d179dSJan Kara dqopt->files[type] = NULL; 2233884d179dSJan Kara iput(inode); 2234884d179dSJan Kara out_lock: 2235884d179dSJan Kara if (oldflags != -1) { 2236a80b12c3SJan Kara mutex_lock(&inode->i_mutex); 2237884d179dSJan Kara /* Set the flags back (in the case of accidental quotaon() 2238884d179dSJan Kara * on a wrong file we don't want to mess up the flags) */ 2239884d179dSJan Kara inode->i_flags &= ~(S_NOATIME | S_NOQUOTA | S_IMMUTABLE); 2240884d179dSJan Kara inode->i_flags |= oldflags; 2241dee86565SJan Kara mutex_unlock(&inode->i_mutex); 2242884d179dSJan Kara } 2243d01730d7SJiaying Zhang mutex_unlock(&dqopt->dqonoff_mutex); 2244884d179dSJan Kara out_fmt: 2245884d179dSJan Kara put_quota_format(fmt); 2246884d179dSJan Kara 2247884d179dSJan Kara return error; 2248884d179dSJan Kara } 2249884d179dSJan Kara 2250884d179dSJan Kara /* Reenable quotas on remount RW */ 22510f0dd62fSChristoph Hellwig int dquot_resume(struct super_block *sb, int type) 2252884d179dSJan Kara { 2253884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 2254884d179dSJan Kara struct inode *inode; 22550f0dd62fSChristoph Hellwig int ret = 0, cnt; 2256884d179dSJan Kara unsigned int flags; 2257884d179dSJan Kara 22580f0dd62fSChristoph Hellwig for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 22590f0dd62fSChristoph Hellwig if (type != -1 && cnt != type) 22600f0dd62fSChristoph Hellwig continue; 22610f0dd62fSChristoph Hellwig 2262884d179dSJan Kara mutex_lock(&dqopt->dqonoff_mutex); 22630f0dd62fSChristoph Hellwig if (!sb_has_quota_suspended(sb, cnt)) { 2264884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 22650f0dd62fSChristoph Hellwig continue; 2266884d179dSJan Kara } 22670f0dd62fSChristoph Hellwig inode = dqopt->files[cnt]; 22680f0dd62fSChristoph Hellwig dqopt->files[cnt] = NULL; 2269884d179dSJan Kara spin_lock(&dq_state_lock); 2270884d179dSJan Kara flags = dqopt->flags & dquot_state_flag(DQUOT_USAGE_ENABLED | 22710f0dd62fSChristoph Hellwig DQUOT_LIMITS_ENABLED, 22720f0dd62fSChristoph Hellwig cnt); 22730f0dd62fSChristoph Hellwig dqopt->flags &= ~dquot_state_flag(DQUOT_STATE_FLAGS, cnt); 2274884d179dSJan Kara spin_unlock(&dq_state_lock); 2275884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 2276884d179dSJan Kara 22770f0dd62fSChristoph Hellwig flags = dquot_generic_flag(flags, cnt); 22780f0dd62fSChristoph Hellwig ret = vfs_load_quota_inode(inode, cnt, 22790f0dd62fSChristoph Hellwig dqopt->info[cnt].dqi_fmt_id, flags); 2280884d179dSJan Kara iput(inode); 22810f0dd62fSChristoph Hellwig } 2282884d179dSJan Kara 2283884d179dSJan Kara return ret; 2284884d179dSJan Kara } 22850f0dd62fSChristoph Hellwig EXPORT_SYMBOL(dquot_resume); 2286884d179dSJan Kara 2287f00c9e44SJan Kara int dquot_quota_on(struct super_block *sb, int type, int format_id, 2288884d179dSJan Kara struct path *path) 2289884d179dSJan Kara { 2290884d179dSJan Kara int error = security_quota_on(path->dentry); 2291884d179dSJan Kara if (error) 2292884d179dSJan Kara return error; 2293884d179dSJan Kara /* Quota file not on the same filesystem? */ 2294d8c9584eSAl Viro if (path->dentry->d_sb != sb) 2295884d179dSJan Kara error = -EXDEV; 2296884d179dSJan Kara else 2297884d179dSJan Kara error = vfs_load_quota_inode(path->dentry->d_inode, type, 2298884d179dSJan Kara format_id, DQUOT_USAGE_ENABLED | 2299884d179dSJan Kara DQUOT_LIMITS_ENABLED); 2300884d179dSJan Kara return error; 2301884d179dSJan Kara } 2302287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_quota_on); 2303884d179dSJan Kara 2304884d179dSJan Kara /* 2305884d179dSJan Kara * More powerful function for turning on quotas allowing setting 2306884d179dSJan Kara * of individual quota flags 2307884d179dSJan Kara */ 2308287a8095SChristoph Hellwig int dquot_enable(struct inode *inode, int type, int format_id, 2309884d179dSJan Kara unsigned int flags) 2310884d179dSJan Kara { 2311884d179dSJan Kara int ret = 0; 2312884d179dSJan Kara struct super_block *sb = inode->i_sb; 2313884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 2314884d179dSJan Kara 2315884d179dSJan Kara /* Just unsuspend quotas? */ 23160f0dd62fSChristoph Hellwig BUG_ON(flags & DQUOT_SUSPENDED); 23170f0dd62fSChristoph Hellwig 2318884d179dSJan Kara if (!flags) 2319884d179dSJan Kara return 0; 2320884d179dSJan Kara /* Just updating flags needed? */ 2321884d179dSJan Kara if (sb_has_quota_loaded(sb, type)) { 2322884d179dSJan Kara mutex_lock(&dqopt->dqonoff_mutex); 2323884d179dSJan Kara /* Now do a reliable test... */ 2324884d179dSJan Kara if (!sb_has_quota_loaded(sb, type)) { 2325884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 2326884d179dSJan Kara goto load_quota; 2327884d179dSJan Kara } 2328884d179dSJan Kara if (flags & DQUOT_USAGE_ENABLED && 2329884d179dSJan Kara sb_has_quota_usage_enabled(sb, type)) { 2330884d179dSJan Kara ret = -EBUSY; 2331884d179dSJan Kara goto out_lock; 2332884d179dSJan Kara } 2333884d179dSJan Kara if (flags & DQUOT_LIMITS_ENABLED && 2334884d179dSJan Kara sb_has_quota_limits_enabled(sb, type)) { 2335884d179dSJan Kara ret = -EBUSY; 2336884d179dSJan Kara goto out_lock; 2337884d179dSJan Kara } 2338884d179dSJan Kara spin_lock(&dq_state_lock); 2339884d179dSJan Kara sb_dqopt(sb)->flags |= dquot_state_flag(flags, type); 2340884d179dSJan Kara spin_unlock(&dq_state_lock); 2341884d179dSJan Kara out_lock: 2342884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 2343884d179dSJan Kara return ret; 2344884d179dSJan Kara } 2345884d179dSJan Kara 2346884d179dSJan Kara load_quota: 2347884d179dSJan Kara return vfs_load_quota_inode(inode, type, format_id, flags); 2348884d179dSJan Kara } 2349287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_enable); 2350884d179dSJan Kara 2351884d179dSJan Kara /* 2352884d179dSJan Kara * This function is used when filesystem needs to initialize quotas 2353884d179dSJan Kara * during mount time. 2354884d179dSJan Kara */ 2355287a8095SChristoph Hellwig int dquot_quota_on_mount(struct super_block *sb, char *qf_name, 2356884d179dSJan Kara int format_id, int type) 2357884d179dSJan Kara { 2358884d179dSJan Kara struct dentry *dentry; 2359884d179dSJan Kara int error; 2360884d179dSJan Kara 2361c56818d7SJan Kara mutex_lock(&sb->s_root->d_inode->i_mutex); 2362884d179dSJan Kara dentry = lookup_one_len(qf_name, sb->s_root, strlen(qf_name)); 2363c56818d7SJan Kara mutex_unlock(&sb->s_root->d_inode->i_mutex); 2364884d179dSJan Kara if (IS_ERR(dentry)) 2365884d179dSJan Kara return PTR_ERR(dentry); 2366884d179dSJan Kara 2367884d179dSJan Kara if (!dentry->d_inode) { 2368884d179dSJan Kara error = -ENOENT; 2369884d179dSJan Kara goto out; 2370884d179dSJan Kara } 2371884d179dSJan Kara 2372884d179dSJan Kara error = security_quota_on(dentry); 2373884d179dSJan Kara if (!error) 2374884d179dSJan Kara error = vfs_load_quota_inode(dentry->d_inode, type, format_id, 2375884d179dSJan Kara DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); 2376884d179dSJan Kara 2377884d179dSJan Kara out: 2378884d179dSJan Kara dput(dentry); 2379884d179dSJan Kara return error; 2380884d179dSJan Kara } 2381287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_quota_on_mount); 2382884d179dSJan Kara 2383884d179dSJan Kara static inline qsize_t qbtos(qsize_t blocks) 2384884d179dSJan Kara { 2385884d179dSJan Kara return blocks << QIF_DQBLKSIZE_BITS; 2386884d179dSJan Kara } 2387884d179dSJan Kara 2388884d179dSJan Kara static inline qsize_t stoqb(qsize_t space) 2389884d179dSJan Kara { 2390884d179dSJan Kara return (space + QIF_DQBLKSIZE - 1) >> QIF_DQBLKSIZE_BITS; 2391884d179dSJan Kara } 2392884d179dSJan Kara 2393884d179dSJan Kara /* Generic routine for getting common part of quota structure */ 2394b9b2dd36SChristoph Hellwig static void do_get_dqblk(struct dquot *dquot, struct fs_disk_quota *di) 2395884d179dSJan Kara { 2396884d179dSJan Kara struct mem_dqblk *dm = &dquot->dq_dqb; 2397884d179dSJan Kara 2398b9b2dd36SChristoph Hellwig memset(di, 0, sizeof(*di)); 2399b9b2dd36SChristoph Hellwig di->d_version = FS_DQUOT_VERSION; 24004c376dcaSEric W. Biederman di->d_flags = dquot->dq_id.type == USRQUOTA ? 2401ade7ce31SChristoph Hellwig FS_USER_QUOTA : FS_GROUP_QUOTA; 24024c376dcaSEric W. Biederman di->d_id = from_kqid_munged(current_user_ns(), dquot->dq_id); 2403b9b2dd36SChristoph Hellwig 2404884d179dSJan Kara spin_lock(&dq_data_lock); 2405b9b2dd36SChristoph Hellwig di->d_blk_hardlimit = stoqb(dm->dqb_bhardlimit); 2406b9b2dd36SChristoph Hellwig di->d_blk_softlimit = stoqb(dm->dqb_bsoftlimit); 2407b9b2dd36SChristoph Hellwig di->d_ino_hardlimit = dm->dqb_ihardlimit; 2408b9b2dd36SChristoph Hellwig di->d_ino_softlimit = dm->dqb_isoftlimit; 2409b9b2dd36SChristoph Hellwig di->d_bcount = dm->dqb_curspace + dm->dqb_rsvspace; 2410b9b2dd36SChristoph Hellwig di->d_icount = dm->dqb_curinodes; 2411b9b2dd36SChristoph Hellwig di->d_btimer = dm->dqb_btime; 2412b9b2dd36SChristoph Hellwig di->d_itimer = dm->dqb_itime; 2413884d179dSJan Kara spin_unlock(&dq_data_lock); 2414884d179dSJan Kara } 2415884d179dSJan Kara 241674a8a103SEric W. Biederman int dquot_get_dqblk(struct super_block *sb, struct kqid qid, 2417b9b2dd36SChristoph Hellwig struct fs_disk_quota *di) 2418884d179dSJan Kara { 2419884d179dSJan Kara struct dquot *dquot; 2420884d179dSJan Kara 2421aca645a6SEric W. Biederman dquot = dqget(sb, qid); 2422dd6f3c6dSJan Kara if (!dquot) 2423884d179dSJan Kara return -ESRCH; 2424884d179dSJan Kara do_get_dqblk(dquot, di); 2425884d179dSJan Kara dqput(dquot); 2426884d179dSJan Kara 2427884d179dSJan Kara return 0; 2428884d179dSJan Kara } 2429287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_get_dqblk); 2430884d179dSJan Kara 2431c472b432SChristoph Hellwig #define VFS_FS_DQ_MASK \ 2432c472b432SChristoph Hellwig (FS_DQ_BCOUNT | FS_DQ_BSOFT | FS_DQ_BHARD | \ 2433c472b432SChristoph Hellwig FS_DQ_ICOUNT | FS_DQ_ISOFT | FS_DQ_IHARD | \ 2434c472b432SChristoph Hellwig FS_DQ_BTIMER | FS_DQ_ITIMER) 2435c472b432SChristoph Hellwig 2436884d179dSJan Kara /* Generic routine for setting common part of quota structure */ 2437c472b432SChristoph Hellwig static int do_set_dqblk(struct dquot *dquot, struct fs_disk_quota *di) 2438884d179dSJan Kara { 2439884d179dSJan Kara struct mem_dqblk *dm = &dquot->dq_dqb; 2440884d179dSJan Kara int check_blim = 0, check_ilim = 0; 24414c376dcaSEric W. Biederman struct mem_dqinfo *dqi = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_id.type]; 2442884d179dSJan Kara 2443c472b432SChristoph Hellwig if (di->d_fieldmask & ~VFS_FS_DQ_MASK) 2444c472b432SChristoph Hellwig return -EINVAL; 2445c472b432SChristoph Hellwig 2446c472b432SChristoph Hellwig if (((di->d_fieldmask & FS_DQ_BSOFT) && 2447c472b432SChristoph Hellwig (di->d_blk_softlimit > dqi->dqi_maxblimit)) || 2448c472b432SChristoph Hellwig ((di->d_fieldmask & FS_DQ_BHARD) && 2449c472b432SChristoph Hellwig (di->d_blk_hardlimit > dqi->dqi_maxblimit)) || 2450c472b432SChristoph Hellwig ((di->d_fieldmask & FS_DQ_ISOFT) && 2451c472b432SChristoph Hellwig (di->d_ino_softlimit > dqi->dqi_maxilimit)) || 2452c472b432SChristoph Hellwig ((di->d_fieldmask & FS_DQ_IHARD) && 2453c472b432SChristoph Hellwig (di->d_ino_hardlimit > dqi->dqi_maxilimit))) 2454884d179dSJan Kara return -ERANGE; 2455884d179dSJan Kara 2456884d179dSJan Kara spin_lock(&dq_data_lock); 2457c472b432SChristoph Hellwig if (di->d_fieldmask & FS_DQ_BCOUNT) { 2458c472b432SChristoph Hellwig dm->dqb_curspace = di->d_bcount - dm->dqb_rsvspace; 2459884d179dSJan Kara check_blim = 1; 246008261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags); 2461884d179dSJan Kara } 2462c472b432SChristoph Hellwig 2463c472b432SChristoph Hellwig if (di->d_fieldmask & FS_DQ_BSOFT) 2464c472b432SChristoph Hellwig dm->dqb_bsoftlimit = qbtos(di->d_blk_softlimit); 2465c472b432SChristoph Hellwig if (di->d_fieldmask & FS_DQ_BHARD) 2466c472b432SChristoph Hellwig dm->dqb_bhardlimit = qbtos(di->d_blk_hardlimit); 2467c472b432SChristoph Hellwig if (di->d_fieldmask & (FS_DQ_BSOFT | FS_DQ_BHARD)) { 2468884d179dSJan Kara check_blim = 1; 246908261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags); 2470884d179dSJan Kara } 2471c472b432SChristoph Hellwig 2472c472b432SChristoph Hellwig if (di->d_fieldmask & FS_DQ_ICOUNT) { 2473c472b432SChristoph Hellwig dm->dqb_curinodes = di->d_icount; 2474884d179dSJan Kara check_ilim = 1; 247508261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags); 2476884d179dSJan Kara } 2477c472b432SChristoph Hellwig 2478c472b432SChristoph Hellwig if (di->d_fieldmask & FS_DQ_ISOFT) 2479c472b432SChristoph Hellwig dm->dqb_isoftlimit = di->d_ino_softlimit; 2480c472b432SChristoph Hellwig if (di->d_fieldmask & FS_DQ_IHARD) 2481c472b432SChristoph Hellwig dm->dqb_ihardlimit = di->d_ino_hardlimit; 2482c472b432SChristoph Hellwig if (di->d_fieldmask & (FS_DQ_ISOFT | FS_DQ_IHARD)) { 2483884d179dSJan Kara check_ilim = 1; 248408261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags); 2485884d179dSJan Kara } 2486c472b432SChristoph Hellwig 2487c472b432SChristoph Hellwig if (di->d_fieldmask & FS_DQ_BTIMER) { 2488c472b432SChristoph Hellwig dm->dqb_btime = di->d_btimer; 2489884d179dSJan Kara check_blim = 1; 249008261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags); 2491884d179dSJan Kara } 2492c472b432SChristoph Hellwig 2493c472b432SChristoph Hellwig if (di->d_fieldmask & FS_DQ_ITIMER) { 2494c472b432SChristoph Hellwig dm->dqb_itime = di->d_itimer; 2495884d179dSJan Kara check_ilim = 1; 249608261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags); 2497884d179dSJan Kara } 2498884d179dSJan Kara 2499884d179dSJan Kara if (check_blim) { 2500268157baSJan Kara if (!dm->dqb_bsoftlimit || 2501268157baSJan Kara dm->dqb_curspace < dm->dqb_bsoftlimit) { 2502884d179dSJan Kara dm->dqb_btime = 0; 2503884d179dSJan Kara clear_bit(DQ_BLKS_B, &dquot->dq_flags); 2504c472b432SChristoph Hellwig } else if (!(di->d_fieldmask & FS_DQ_BTIMER)) 2505268157baSJan Kara /* Set grace only if user hasn't provided his own... */ 2506884d179dSJan Kara dm->dqb_btime = get_seconds() + dqi->dqi_bgrace; 2507884d179dSJan Kara } 2508884d179dSJan Kara if (check_ilim) { 2509268157baSJan Kara if (!dm->dqb_isoftlimit || 2510268157baSJan Kara dm->dqb_curinodes < dm->dqb_isoftlimit) { 2511884d179dSJan Kara dm->dqb_itime = 0; 2512884d179dSJan Kara clear_bit(DQ_INODES_B, &dquot->dq_flags); 2513c472b432SChristoph Hellwig } else if (!(di->d_fieldmask & FS_DQ_ITIMER)) 2514268157baSJan Kara /* Set grace only if user hasn't provided his own... */ 2515884d179dSJan Kara dm->dqb_itime = get_seconds() + dqi->dqi_igrace; 2516884d179dSJan Kara } 2517268157baSJan Kara if (dm->dqb_bhardlimit || dm->dqb_bsoftlimit || dm->dqb_ihardlimit || 2518268157baSJan Kara dm->dqb_isoftlimit) 2519884d179dSJan Kara clear_bit(DQ_FAKE_B, &dquot->dq_flags); 2520884d179dSJan Kara else 2521884d179dSJan Kara set_bit(DQ_FAKE_B, &dquot->dq_flags); 2522884d179dSJan Kara spin_unlock(&dq_data_lock); 2523884d179dSJan Kara mark_dquot_dirty(dquot); 2524884d179dSJan Kara 2525884d179dSJan Kara return 0; 2526884d179dSJan Kara } 2527884d179dSJan Kara 252874a8a103SEric W. Biederman int dquot_set_dqblk(struct super_block *sb, struct kqid qid, 2529c472b432SChristoph Hellwig struct fs_disk_quota *di) 2530884d179dSJan Kara { 2531884d179dSJan Kara struct dquot *dquot; 2532884d179dSJan Kara int rc; 2533884d179dSJan Kara 2534aca645a6SEric W. Biederman dquot = dqget(sb, qid); 2535884d179dSJan Kara if (!dquot) { 2536884d179dSJan Kara rc = -ESRCH; 2537884d179dSJan Kara goto out; 2538884d179dSJan Kara } 2539884d179dSJan Kara rc = do_set_dqblk(dquot, di); 2540884d179dSJan Kara dqput(dquot); 2541884d179dSJan Kara out: 2542884d179dSJan Kara return rc; 2543884d179dSJan Kara } 2544287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_set_dqblk); 2545884d179dSJan Kara 2546884d179dSJan Kara /* Generic routine for getting common part of quota file information */ 2547287a8095SChristoph Hellwig int dquot_get_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii) 2548884d179dSJan Kara { 2549884d179dSJan Kara struct mem_dqinfo *mi; 2550884d179dSJan Kara 2551884d179dSJan Kara mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); 2552884d179dSJan Kara if (!sb_has_quota_active(sb, type)) { 2553884d179dSJan Kara mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); 2554884d179dSJan Kara return -ESRCH; 2555884d179dSJan Kara } 2556884d179dSJan Kara mi = sb_dqopt(sb)->info + type; 2557884d179dSJan Kara spin_lock(&dq_data_lock); 2558884d179dSJan Kara ii->dqi_bgrace = mi->dqi_bgrace; 2559884d179dSJan Kara ii->dqi_igrace = mi->dqi_igrace; 256046fe44ceSJan Kara ii->dqi_flags = mi->dqi_flags & DQF_GETINFO_MASK; 2561884d179dSJan Kara ii->dqi_valid = IIF_ALL; 2562884d179dSJan Kara spin_unlock(&dq_data_lock); 2563884d179dSJan Kara mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); 2564884d179dSJan Kara return 0; 2565884d179dSJan Kara } 2566287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_get_dqinfo); 2567884d179dSJan Kara 2568884d179dSJan Kara /* Generic routine for setting common part of quota file information */ 2569287a8095SChristoph Hellwig int dquot_set_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii) 2570884d179dSJan Kara { 2571884d179dSJan Kara struct mem_dqinfo *mi; 2572884d179dSJan Kara int err = 0; 2573884d179dSJan Kara 2574884d179dSJan Kara mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); 2575884d179dSJan Kara if (!sb_has_quota_active(sb, type)) { 2576884d179dSJan Kara err = -ESRCH; 2577884d179dSJan Kara goto out; 2578884d179dSJan Kara } 2579884d179dSJan Kara mi = sb_dqopt(sb)->info + type; 2580884d179dSJan Kara spin_lock(&dq_data_lock); 2581884d179dSJan Kara if (ii->dqi_valid & IIF_BGRACE) 2582884d179dSJan Kara mi->dqi_bgrace = ii->dqi_bgrace; 2583884d179dSJan Kara if (ii->dqi_valid & IIF_IGRACE) 2584884d179dSJan Kara mi->dqi_igrace = ii->dqi_igrace; 2585884d179dSJan Kara if (ii->dqi_valid & IIF_FLAGS) 258646fe44ceSJan Kara mi->dqi_flags = (mi->dqi_flags & ~DQF_SETINFO_MASK) | 258746fe44ceSJan Kara (ii->dqi_flags & DQF_SETINFO_MASK); 2588884d179dSJan Kara spin_unlock(&dq_data_lock); 2589884d179dSJan Kara mark_info_dirty(sb, type); 2590884d179dSJan Kara /* Force write to disk */ 2591884d179dSJan Kara sb->dq_op->write_info(sb, type); 2592884d179dSJan Kara out: 2593884d179dSJan Kara mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); 2594884d179dSJan Kara return err; 2595884d179dSJan Kara } 2596287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_set_dqinfo); 2597884d179dSJan Kara 2598287a8095SChristoph Hellwig const struct quotactl_ops dquot_quotactl_ops = { 2599287a8095SChristoph Hellwig .quota_on = dquot_quota_on, 2600287a8095SChristoph Hellwig .quota_off = dquot_quota_off, 2601287a8095SChristoph Hellwig .quota_sync = dquot_quota_sync, 2602287a8095SChristoph Hellwig .get_info = dquot_get_dqinfo, 2603287a8095SChristoph Hellwig .set_info = dquot_set_dqinfo, 2604287a8095SChristoph Hellwig .get_dqblk = dquot_get_dqblk, 2605287a8095SChristoph Hellwig .set_dqblk = dquot_set_dqblk 2606884d179dSJan Kara }; 2607287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_quotactl_ops); 2608dde95888SDmitry Monakhov 2609dde95888SDmitry Monakhov static int do_proc_dqstats(struct ctl_table *table, int write, 2610dde95888SDmitry Monakhov void __user *buffer, size_t *lenp, loff_t *ppos) 2611dde95888SDmitry Monakhov { 2612dde95888SDmitry Monakhov unsigned int type = (int *)table->data - dqstats.stat; 2613f32764bdSDmitry Monakhov 2614f32764bdSDmitry Monakhov /* Update global table */ 2615f32764bdSDmitry Monakhov dqstats.stat[type] = 2616f32764bdSDmitry Monakhov percpu_counter_sum_positive(&dqstats.counter[type]); 2617dde95888SDmitry Monakhov return proc_dointvec(table, write, buffer, lenp, ppos); 2618dde95888SDmitry Monakhov } 2619dde95888SDmitry Monakhov 2620e628753bSJoe Perches static struct ctl_table fs_dqstats_table[] = { 2621884d179dSJan Kara { 2622884d179dSJan Kara .procname = "lookups", 2623dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_LOOKUPS], 2624884d179dSJan Kara .maxlen = sizeof(int), 2625884d179dSJan Kara .mode = 0444, 2626dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2627884d179dSJan Kara }, 2628884d179dSJan Kara { 2629884d179dSJan Kara .procname = "drops", 2630dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_DROPS], 2631884d179dSJan Kara .maxlen = sizeof(int), 2632884d179dSJan Kara .mode = 0444, 2633dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2634884d179dSJan Kara }, 2635884d179dSJan Kara { 2636884d179dSJan Kara .procname = "reads", 2637dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_READS], 2638884d179dSJan Kara .maxlen = sizeof(int), 2639884d179dSJan Kara .mode = 0444, 2640dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2641884d179dSJan Kara }, 2642884d179dSJan Kara { 2643884d179dSJan Kara .procname = "writes", 2644dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_WRITES], 2645884d179dSJan Kara .maxlen = sizeof(int), 2646884d179dSJan Kara .mode = 0444, 2647dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2648884d179dSJan Kara }, 2649884d179dSJan Kara { 2650884d179dSJan Kara .procname = "cache_hits", 2651dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_CACHE_HITS], 2652884d179dSJan Kara .maxlen = sizeof(int), 2653884d179dSJan Kara .mode = 0444, 2654dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2655884d179dSJan Kara }, 2656884d179dSJan Kara { 2657884d179dSJan Kara .procname = "allocated_dquots", 2658dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_ALLOC_DQUOTS], 2659884d179dSJan Kara .maxlen = sizeof(int), 2660884d179dSJan Kara .mode = 0444, 2661dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2662884d179dSJan Kara }, 2663884d179dSJan Kara { 2664884d179dSJan Kara .procname = "free_dquots", 2665dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_FREE_DQUOTS], 2666884d179dSJan Kara .maxlen = sizeof(int), 2667884d179dSJan Kara .mode = 0444, 2668dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2669884d179dSJan Kara }, 2670884d179dSJan Kara { 2671884d179dSJan Kara .procname = "syncs", 2672dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_SYNCS], 2673884d179dSJan Kara .maxlen = sizeof(int), 2674884d179dSJan Kara .mode = 0444, 2675dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2676884d179dSJan Kara }, 2677884d179dSJan Kara #ifdef CONFIG_PRINT_QUOTA_WARNING 2678884d179dSJan Kara { 2679884d179dSJan Kara .procname = "warnings", 2680884d179dSJan Kara .data = &flag_print_warnings, 2681884d179dSJan Kara .maxlen = sizeof(int), 2682884d179dSJan Kara .mode = 0644, 26836d456111SEric W. Biederman .proc_handler = proc_dointvec, 2684884d179dSJan Kara }, 2685884d179dSJan Kara #endif 2686ab09203eSEric W. Biederman { }, 2687884d179dSJan Kara }; 2688884d179dSJan Kara 2689e628753bSJoe Perches static struct ctl_table fs_table[] = { 2690884d179dSJan Kara { 2691884d179dSJan Kara .procname = "quota", 2692884d179dSJan Kara .mode = 0555, 2693884d179dSJan Kara .child = fs_dqstats_table, 2694884d179dSJan Kara }, 2695ab09203eSEric W. Biederman { }, 2696884d179dSJan Kara }; 2697884d179dSJan Kara 2698e628753bSJoe Perches static struct ctl_table sys_table[] = { 2699884d179dSJan Kara { 2700884d179dSJan Kara .procname = "fs", 2701884d179dSJan Kara .mode = 0555, 2702884d179dSJan Kara .child = fs_table, 2703884d179dSJan Kara }, 2704ab09203eSEric W. Biederman { }, 2705884d179dSJan Kara }; 2706884d179dSJan Kara 2707884d179dSJan Kara static int __init dquot_init(void) 2708884d179dSJan Kara { 2709f32764bdSDmitry Monakhov int i, ret; 2710884d179dSJan Kara unsigned long nr_hash, order; 2711884d179dSJan Kara 2712884d179dSJan Kara printk(KERN_NOTICE "VFS: Disk quotas %s\n", __DQUOT_VERSION__); 2713884d179dSJan Kara 2714884d179dSJan Kara register_sysctl_table(sys_table); 2715884d179dSJan Kara 2716884d179dSJan Kara dquot_cachep = kmem_cache_create("dquot", 2717884d179dSJan Kara sizeof(struct dquot), sizeof(unsigned long) * 4, 2718884d179dSJan Kara (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| 2719884d179dSJan Kara SLAB_MEM_SPREAD|SLAB_PANIC), 2720884d179dSJan Kara NULL); 2721884d179dSJan Kara 2722884d179dSJan Kara order = 0; 2723884d179dSJan Kara dquot_hash = (struct hlist_head *)__get_free_pages(GFP_ATOMIC, order); 2724884d179dSJan Kara if (!dquot_hash) 2725884d179dSJan Kara panic("Cannot create dquot hash table"); 2726884d179dSJan Kara 2727f32764bdSDmitry Monakhov for (i = 0; i < _DQST_DQSTAT_LAST; i++) { 2728*908c7f19STejun Heo ret = percpu_counter_init(&dqstats.counter[i], 0, GFP_KERNEL); 2729f32764bdSDmitry Monakhov if (ret) 2730f32764bdSDmitry Monakhov panic("Cannot create dquot stat counters"); 2731f32764bdSDmitry Monakhov } 2732dde95888SDmitry Monakhov 2733884d179dSJan Kara /* Find power-of-two hlist_heads which can fit into allocation */ 2734884d179dSJan Kara nr_hash = (1UL << order) * PAGE_SIZE / sizeof(struct hlist_head); 2735884d179dSJan Kara dq_hash_bits = 0; 2736884d179dSJan Kara do { 2737884d179dSJan Kara dq_hash_bits++; 2738884d179dSJan Kara } while (nr_hash >> dq_hash_bits); 2739884d179dSJan Kara dq_hash_bits--; 2740884d179dSJan Kara 2741884d179dSJan Kara nr_hash = 1UL << dq_hash_bits; 2742884d179dSJan Kara dq_hash_mask = nr_hash - 1; 2743884d179dSJan Kara for (i = 0; i < nr_hash; i++) 2744884d179dSJan Kara INIT_HLIST_HEAD(dquot_hash + i); 2745884d179dSJan Kara 2746884d179dSJan Kara printk("Dquot-cache hash table entries: %ld (order %ld, %ld bytes)\n", 2747884d179dSJan Kara nr_hash, order, (PAGE_SIZE << order)); 2748884d179dSJan Kara 2749884d179dSJan Kara register_shrinker(&dqcache_shrinker); 2750884d179dSJan Kara 2751884d179dSJan Kara return 0; 2752884d179dSJan Kara } 2753884d179dSJan Kara module_init(dquot_init); 2754