1884d179dSJan Kara /* 2884d179dSJan Kara * Implementation of the diskquota system for the LINUX operating system. QUOTA 3884d179dSJan Kara * is implemented using the BSD system call interface as the means of 4884d179dSJan Kara * communication with the user level. This file contains the generic routines 5884d179dSJan Kara * called by the different filesystems on allocation of an inode or block. 6884d179dSJan Kara * These routines take care of the administration needed to have a consistent 7884d179dSJan Kara * diskquota tracking system. The ideas of both user and group quotas are based 8884d179dSJan Kara * on the Melbourne quota system as used on BSD derived systems. The internal 9884d179dSJan Kara * implementation is based on one of the several variants of the LINUX 10884d179dSJan Kara * inode-subsystem with added complexity of the diskquota system. 11884d179dSJan Kara * 12884d179dSJan Kara * Author: Marco van Wieringen <mvw@planets.elm.net> 13884d179dSJan Kara * 14884d179dSJan Kara * Fixes: Dmitry Gorodchanin <pgmdsg@ibi.com>, 11 Feb 96 15884d179dSJan Kara * 16884d179dSJan Kara * Revised list management to avoid races 17884d179dSJan Kara * -- Bill Hawes, <whawes@star.net>, 9/98 18884d179dSJan Kara * 19884d179dSJan Kara * Fixed races in dquot_transfer(), dqget() and dquot_alloc_...(). 20884d179dSJan Kara * As the consequence the locking was moved from dquot_decr_...(), 21884d179dSJan Kara * dquot_incr_...() to calling functions. 22884d179dSJan Kara * invalidate_dquots() now writes modified dquots. 23884d179dSJan Kara * Serialized quota_off() and quota_on() for mount point. 24884d179dSJan Kara * Fixed a few bugs in grow_dquots(). 25884d179dSJan Kara * Fixed deadlock in write_dquot() - we no longer account quotas on 26884d179dSJan Kara * quota files 27884d179dSJan Kara * remove_dquot_ref() moved to inode.c - it now traverses through inodes 28884d179dSJan Kara * add_dquot_ref() restarts after blocking 29884d179dSJan Kara * Added check for bogus uid and fixed check for group in quotactl. 30884d179dSJan Kara * Jan Kara, <jack@suse.cz>, sponsored by SuSE CR, 10-11/99 31884d179dSJan Kara * 32884d179dSJan Kara * Used struct list_head instead of own list struct 33884d179dSJan Kara * Invalidation of referenced dquots is no longer possible 34884d179dSJan Kara * Improved free_dquots list management 35884d179dSJan Kara * Quota and i_blocks are now updated in one place to avoid races 36884d179dSJan Kara * Warnings are now delayed so we won't block in critical section 37884d179dSJan Kara * Write updated not to require dquot lock 38884d179dSJan Kara * Jan Kara, <jack@suse.cz>, 9/2000 39884d179dSJan Kara * 40884d179dSJan Kara * Added dynamic quota structure allocation 41884d179dSJan Kara * Jan Kara <jack@suse.cz> 12/2000 42884d179dSJan Kara * 43884d179dSJan Kara * Rewritten quota interface. Implemented new quota format and 44884d179dSJan Kara * formats registering. 45884d179dSJan Kara * Jan Kara, <jack@suse.cz>, 2001,2002 46884d179dSJan Kara * 47884d179dSJan Kara * New SMP locking. 48884d179dSJan Kara * Jan Kara, <jack@suse.cz>, 10/2002 49884d179dSJan Kara * 50884d179dSJan Kara * Added journalled quota support, fix lock inversion problems 51884d179dSJan Kara * Jan Kara, <jack@suse.cz>, 2003,2004 52884d179dSJan Kara * 53884d179dSJan Kara * (C) Copyright 1994 - 1997 Marco van Wieringen 54884d179dSJan Kara */ 55884d179dSJan Kara 56884d179dSJan Kara #include <linux/errno.h> 57884d179dSJan Kara #include <linux/kernel.h> 58884d179dSJan Kara #include <linux/fs.h> 59884d179dSJan Kara #include <linux/mount.h> 60884d179dSJan Kara #include <linux/mm.h> 61884d179dSJan Kara #include <linux/time.h> 62884d179dSJan Kara #include <linux/types.h> 63884d179dSJan Kara #include <linux/string.h> 64884d179dSJan Kara #include <linux/fcntl.h> 65884d179dSJan Kara #include <linux/stat.h> 66884d179dSJan Kara #include <linux/tty.h> 67884d179dSJan Kara #include <linux/file.h> 68884d179dSJan Kara #include <linux/slab.h> 69884d179dSJan Kara #include <linux/sysctl.h> 70884d179dSJan Kara #include <linux/init.h> 71884d179dSJan Kara #include <linux/module.h> 72884d179dSJan Kara #include <linux/proc_fs.h> 73884d179dSJan Kara #include <linux/security.h> 7440401530SAl Viro #include <linux/sched.h> 755b825c3aSIngo Molnar #include <linux/cred.h> 76884d179dSJan Kara #include <linux/kmod.h> 77884d179dSJan Kara #include <linux/namei.h> 78884d179dSJan Kara #include <linux/capability.h> 79884d179dSJan Kara #include <linux/quotaops.h> 8055fa6091SDave Chinner #include "../internal.h" /* ugh */ 81884d179dSJan Kara 82f3da9310SJeff Liu #include <linux/uaccess.h> 83884d179dSJan Kara 84884d179dSJan Kara /* 85884d179dSJan Kara * There are three quota SMP locks. dq_list_lock protects all lists with quotas 86dde95888SDmitry Monakhov * and quota formats. 87884d179dSJan Kara * dq_data_lock protects data from dq_dqb and also mem_dqinfo structures and 88884d179dSJan Kara * also guards consistency of dquot->dq_dqb with inode->i_blocks, i_bytes. 89884d179dSJan Kara * i_blocks and i_bytes updates itself are guarded by i_lock acquired directly 90884d179dSJan Kara * in inode_add_bytes() and inode_sub_bytes(). dq_state_lock protects 91884d179dSJan Kara * modifications of quota state (on quotaon and quotaoff) and readers who care 92884d179dSJan Kara * about latest values take it as well. 93884d179dSJan Kara * 94884d179dSJan Kara * The spinlock ordering is hence: dq_data_lock > dq_list_lock > i_lock, 95884d179dSJan Kara * dq_list_lock > dq_state_lock 96884d179dSJan Kara * 97884d179dSJan Kara * Note that some things (eg. sb pointer, type, id) doesn't change during 98884d179dSJan Kara * the life of the dquot structure and so needn't to be protected by a lock 99884d179dSJan Kara * 100b9ba6f94SNiu Yawei * Operation accessing dquots via inode pointers are protected by dquot_srcu. 101b9ba6f94SNiu Yawei * Operation of reading pointer needs srcu_read_lock(&dquot_srcu), and 102b9ba6f94SNiu Yawei * synchronize_srcu(&dquot_srcu) is called after clearing pointers from 103b9ba6f94SNiu Yawei * inode and before dropping dquot references to avoid use of dquots after 104b9ba6f94SNiu Yawei * they are freed. dq_data_lock is used to serialize the pointer setting and 105b9ba6f94SNiu Yawei * clearing operations. 10626245c94SJan Kara * Special care needs to be taken about S_NOQUOTA inode flag (marking that 10726245c94SJan Kara * inode is a quota file). Functions adding pointers from inode to dquots have 108b9ba6f94SNiu Yawei * to check this flag under dq_data_lock and then (if S_NOQUOTA is not set) they 109b9ba6f94SNiu Yawei * have to do all pointer modifications before dropping dq_data_lock. This makes 11026245c94SJan Kara * sure they cannot race with quotaon which first sets S_NOQUOTA flag and 11126245c94SJan Kara * then drops all pointers to dquots from an inode. 112884d179dSJan Kara * 1135e8cb9b6SJan Kara * Each dquot has its dq_lock mutex. Dquot is locked when it is being read to 1145e8cb9b6SJan Kara * memory (or space for it is being allocated) on the first dqget(), when it is 1155e8cb9b6SJan Kara * being written out, and when it is being released on the last dqput(). The 1165e8cb9b6SJan Kara * allocation and release operations are serialized by the dq_lock and by 1175e8cb9b6SJan Kara * checking the use count in dquot_release(). 118884d179dSJan Kara * 119884d179dSJan Kara * Lock ordering (including related VFS locks) is the following: 120bc8230eeSJan Kara * s_umount > i_mutex > journal_lock > dquot->dq_lock > dqio_sem 121884d179dSJan Kara */ 122884d179dSJan Kara 123c516610cSJan Kara static __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_list_lock); 124c516610cSJan Kara static __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_state_lock); 125c516610cSJan Kara __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_data_lock); 126884d179dSJan Kara EXPORT_SYMBOL(dq_data_lock); 127b9ba6f94SNiu Yawei DEFINE_STATIC_SRCU(dquot_srcu); 128884d179dSJan Kara 129503330f3SJan Kara static DECLARE_WAIT_QUEUE_HEAD(dquot_ref_wq); 130503330f3SJan Kara 131fb5ffb0eSJiaying Zhang void __quota_error(struct super_block *sb, const char *func, 132fb5ffb0eSJiaying Zhang const char *fmt, ...) 133fb5ffb0eSJiaying Zhang { 134fb5ffb0eSJiaying Zhang if (printk_ratelimit()) { 135055adcbdSJoe Perches va_list args; 136055adcbdSJoe Perches struct va_format vaf; 137055adcbdSJoe Perches 138fb5ffb0eSJiaying Zhang va_start(args, fmt); 139055adcbdSJoe Perches 140055adcbdSJoe Perches vaf.fmt = fmt; 141055adcbdSJoe Perches vaf.va = &args; 142055adcbdSJoe Perches 143055adcbdSJoe Perches printk(KERN_ERR "Quota error (device %s): %s: %pV\n", 144055adcbdSJoe Perches sb->s_id, func, &vaf); 145055adcbdSJoe Perches 146fb5ffb0eSJiaying Zhang va_end(args); 147fb5ffb0eSJiaying Zhang } 148fb5ffb0eSJiaying Zhang } 149fb5ffb0eSJiaying Zhang EXPORT_SYMBOL(__quota_error); 150fb5ffb0eSJiaying Zhang 151da8d1ba2SSergey Senozhatsky #if defined(CONFIG_QUOTA_DEBUG) || defined(CONFIG_PRINT_QUOTA_WARNING) 152884d179dSJan Kara static char *quotatypes[] = INITQFNAMES; 153da8d1ba2SSergey Senozhatsky #endif 154884d179dSJan Kara static struct quota_format_type *quota_formats; /* List of registered formats */ 155884d179dSJan Kara static struct quota_module_name module_names[] = INIT_QUOTA_MODULE_NAMES; 156884d179dSJan Kara 157884d179dSJan Kara /* SLAB cache for dquot structures */ 158884d179dSJan Kara static struct kmem_cache *dquot_cachep; 159884d179dSJan Kara 160884d179dSJan Kara int register_quota_format(struct quota_format_type *fmt) 161884d179dSJan Kara { 162884d179dSJan Kara spin_lock(&dq_list_lock); 163884d179dSJan Kara fmt->qf_next = quota_formats; 164884d179dSJan Kara quota_formats = fmt; 165884d179dSJan Kara spin_unlock(&dq_list_lock); 166884d179dSJan Kara return 0; 167884d179dSJan Kara } 168884d179dSJan Kara EXPORT_SYMBOL(register_quota_format); 169884d179dSJan Kara 170884d179dSJan Kara void unregister_quota_format(struct quota_format_type *fmt) 171884d179dSJan Kara { 172884d179dSJan Kara struct quota_format_type **actqf; 173884d179dSJan Kara 174884d179dSJan Kara spin_lock(&dq_list_lock); 175268157baSJan Kara for (actqf = "a_formats; *actqf && *actqf != fmt; 176268157baSJan Kara actqf = &(*actqf)->qf_next) 177268157baSJan Kara ; 178884d179dSJan Kara if (*actqf) 179884d179dSJan Kara *actqf = (*actqf)->qf_next; 180884d179dSJan Kara spin_unlock(&dq_list_lock); 181884d179dSJan Kara } 182884d179dSJan Kara EXPORT_SYMBOL(unregister_quota_format); 183884d179dSJan Kara 184884d179dSJan Kara static struct quota_format_type *find_quota_format(int id) 185884d179dSJan Kara { 186884d179dSJan Kara struct quota_format_type *actqf; 187884d179dSJan Kara 188884d179dSJan Kara spin_lock(&dq_list_lock); 189268157baSJan Kara for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id; 190268157baSJan Kara actqf = actqf->qf_next) 191268157baSJan Kara ; 192884d179dSJan Kara if (!actqf || !try_module_get(actqf->qf_owner)) { 193884d179dSJan Kara int qm; 194884d179dSJan Kara 195884d179dSJan Kara spin_unlock(&dq_list_lock); 196884d179dSJan Kara 197268157baSJan Kara for (qm = 0; module_names[qm].qm_fmt_id && 198268157baSJan Kara module_names[qm].qm_fmt_id != id; qm++) 199268157baSJan Kara ; 200268157baSJan Kara if (!module_names[qm].qm_fmt_id || 201268157baSJan Kara request_module(module_names[qm].qm_mod_name)) 202884d179dSJan Kara return NULL; 203884d179dSJan Kara 204884d179dSJan Kara spin_lock(&dq_list_lock); 205268157baSJan Kara for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id; 206268157baSJan Kara actqf = actqf->qf_next) 207268157baSJan Kara ; 208884d179dSJan Kara if (actqf && !try_module_get(actqf->qf_owner)) 209884d179dSJan Kara actqf = NULL; 210884d179dSJan Kara } 211884d179dSJan Kara spin_unlock(&dq_list_lock); 212884d179dSJan Kara return actqf; 213884d179dSJan Kara } 214884d179dSJan Kara 215884d179dSJan Kara static void put_quota_format(struct quota_format_type *fmt) 216884d179dSJan Kara { 217884d179dSJan Kara module_put(fmt->qf_owner); 218884d179dSJan Kara } 219884d179dSJan Kara 220884d179dSJan Kara /* 221884d179dSJan Kara * Dquot List Management: 222884d179dSJan Kara * The quota code uses three lists for dquot management: the inuse_list, 223884d179dSJan Kara * free_dquots, and dquot_hash[] array. A single dquot structure may be 224884d179dSJan Kara * on all three lists, depending on its current state. 225884d179dSJan Kara * 226884d179dSJan Kara * All dquots are placed to the end of inuse_list when first created, and this 227884d179dSJan Kara * list is used for invalidate operation, which must look at every dquot. 228884d179dSJan Kara * 229884d179dSJan Kara * Unused dquots (dq_count == 0) are added to the free_dquots list when freed, 230884d179dSJan Kara * and this list is searched whenever we need an available dquot. Dquots are 231884d179dSJan Kara * removed from the list as soon as they are used again, and 232884d179dSJan Kara * dqstats.free_dquots gives the number of dquots on the list. When 233884d179dSJan Kara * dquot is invalidated it's completely released from memory. 234884d179dSJan Kara * 235884d179dSJan Kara * Dquots with a specific identity (device, type and id) are placed on 236884d179dSJan Kara * one of the dquot_hash[] hash chains. The provides an efficient search 237884d179dSJan Kara * mechanism to locate a specific dquot. 238884d179dSJan Kara */ 239884d179dSJan Kara 240884d179dSJan Kara static LIST_HEAD(inuse_list); 241884d179dSJan Kara static LIST_HEAD(free_dquots); 242884d179dSJan Kara static unsigned int dq_hash_bits, dq_hash_mask; 243884d179dSJan Kara static struct hlist_head *dquot_hash; 244884d179dSJan Kara 245884d179dSJan Kara struct dqstats dqstats; 246884d179dSJan Kara EXPORT_SYMBOL(dqstats); 247884d179dSJan Kara 2480a5a9c72SJan Kara static qsize_t inode_get_rsv_space(struct inode *inode); 2496184fc0bSJan Kara static int __dquot_initialize(struct inode *inode, int type); 2500a5a9c72SJan Kara 251884d179dSJan Kara static inline unsigned int 2521a06d420SEric W. Biederman hashfn(const struct super_block *sb, struct kqid qid) 253884d179dSJan Kara { 2541a06d420SEric W. Biederman unsigned int id = from_kqid(&init_user_ns, qid); 2551a06d420SEric W. Biederman int type = qid.type; 256884d179dSJan Kara unsigned long tmp; 257884d179dSJan Kara 258884d179dSJan Kara tmp = (((unsigned long)sb>>L1_CACHE_SHIFT) ^ id) * (MAXQUOTAS - type); 259884d179dSJan Kara return (tmp + (tmp >> dq_hash_bits)) & dq_hash_mask; 260884d179dSJan Kara } 261884d179dSJan Kara 262884d179dSJan Kara /* 263884d179dSJan Kara * Following list functions expect dq_list_lock to be held 264884d179dSJan Kara */ 265884d179dSJan Kara static inline void insert_dquot_hash(struct dquot *dquot) 266884d179dSJan Kara { 267268157baSJan Kara struct hlist_head *head; 2681a06d420SEric W. Biederman head = dquot_hash + hashfn(dquot->dq_sb, dquot->dq_id); 269884d179dSJan Kara hlist_add_head(&dquot->dq_hash, head); 270884d179dSJan Kara } 271884d179dSJan Kara 272884d179dSJan Kara static inline void remove_dquot_hash(struct dquot *dquot) 273884d179dSJan Kara { 274884d179dSJan Kara hlist_del_init(&dquot->dq_hash); 275884d179dSJan Kara } 276884d179dSJan Kara 2777a2435d8SJan Kara static struct dquot *find_dquot(unsigned int hashent, struct super_block *sb, 2781a06d420SEric W. Biederman struct kqid qid) 279884d179dSJan Kara { 280884d179dSJan Kara struct hlist_node *node; 281884d179dSJan Kara struct dquot *dquot; 282884d179dSJan Kara 283884d179dSJan Kara hlist_for_each (node, dquot_hash+hashent) { 284884d179dSJan Kara dquot = hlist_entry(node, struct dquot, dq_hash); 2854c376dcaSEric W. Biederman if (dquot->dq_sb == sb && qid_eq(dquot->dq_id, qid)) 286884d179dSJan Kara return dquot; 287884d179dSJan Kara } 288dd6f3c6dSJan Kara return NULL; 289884d179dSJan Kara } 290884d179dSJan Kara 291884d179dSJan Kara /* Add a dquot to the tail of the free list */ 292884d179dSJan Kara static inline void put_dquot_last(struct dquot *dquot) 293884d179dSJan Kara { 294884d179dSJan Kara list_add_tail(&dquot->dq_free, &free_dquots); 295dde95888SDmitry Monakhov dqstats_inc(DQST_FREE_DQUOTS); 296884d179dSJan Kara } 297884d179dSJan Kara 298884d179dSJan Kara static inline void remove_free_dquot(struct dquot *dquot) 299884d179dSJan Kara { 300884d179dSJan Kara if (list_empty(&dquot->dq_free)) 301884d179dSJan Kara return; 302884d179dSJan Kara list_del_init(&dquot->dq_free); 303dde95888SDmitry Monakhov dqstats_dec(DQST_FREE_DQUOTS); 304884d179dSJan Kara } 305884d179dSJan Kara 306884d179dSJan Kara static inline void put_inuse(struct dquot *dquot) 307884d179dSJan Kara { 308884d179dSJan Kara /* We add to the back of inuse list so we don't have to restart 309884d179dSJan Kara * when traversing this list and we block */ 310884d179dSJan Kara list_add_tail(&dquot->dq_inuse, &inuse_list); 311dde95888SDmitry Monakhov dqstats_inc(DQST_ALLOC_DQUOTS); 312884d179dSJan Kara } 313884d179dSJan Kara 314884d179dSJan Kara static inline void remove_inuse(struct dquot *dquot) 315884d179dSJan Kara { 316dde95888SDmitry Monakhov dqstats_dec(DQST_ALLOC_DQUOTS); 317884d179dSJan Kara list_del(&dquot->dq_inuse); 318884d179dSJan Kara } 319884d179dSJan Kara /* 320884d179dSJan Kara * End of list functions needing dq_list_lock 321884d179dSJan Kara */ 322884d179dSJan Kara 323884d179dSJan Kara static void wait_on_dquot(struct dquot *dquot) 324884d179dSJan Kara { 325884d179dSJan Kara mutex_lock(&dquot->dq_lock); 326884d179dSJan Kara mutex_unlock(&dquot->dq_lock); 327884d179dSJan Kara } 328884d179dSJan Kara 329884d179dSJan Kara static inline int dquot_dirty(struct dquot *dquot) 330884d179dSJan Kara { 331884d179dSJan Kara return test_bit(DQ_MOD_B, &dquot->dq_flags); 332884d179dSJan Kara } 333884d179dSJan Kara 334884d179dSJan Kara static inline int mark_dquot_dirty(struct dquot *dquot) 335884d179dSJan Kara { 336884d179dSJan Kara return dquot->dq_sb->dq_op->mark_dirty(dquot); 337884d179dSJan Kara } 338884d179dSJan Kara 339eabf290dSDmitry Monakhov /* Mark dquot dirty in atomic manner, and return it's old dirty flag state */ 340884d179dSJan Kara int dquot_mark_dquot_dirty(struct dquot *dquot) 341884d179dSJan Kara { 342eabf290dSDmitry Monakhov int ret = 1; 343eabf290dSDmitry Monakhov 3444580b30eSJan Kara if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) 3454580b30eSJan Kara return 0; 3464580b30eSJan Kara 347834057bfSJan Kara if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NOLIST_DIRTY) 348834057bfSJan Kara return test_and_set_bit(DQ_MOD_B, &dquot->dq_flags); 349834057bfSJan Kara 350eabf290dSDmitry Monakhov /* If quota is dirty already, we don't have to acquire dq_list_lock */ 351eabf290dSDmitry Monakhov if (test_bit(DQ_MOD_B, &dquot->dq_flags)) 352eabf290dSDmitry Monakhov return 1; 353eabf290dSDmitry Monakhov 354884d179dSJan Kara spin_lock(&dq_list_lock); 355eabf290dSDmitry Monakhov if (!test_and_set_bit(DQ_MOD_B, &dquot->dq_flags)) { 356884d179dSJan Kara list_add(&dquot->dq_dirty, &sb_dqopt(dquot->dq_sb)-> 3574c376dcaSEric W. Biederman info[dquot->dq_id.type].dqi_dirty_list); 358eabf290dSDmitry Monakhov ret = 0; 359eabf290dSDmitry Monakhov } 360884d179dSJan Kara spin_unlock(&dq_list_lock); 361eabf290dSDmitry Monakhov return ret; 362884d179dSJan Kara } 363884d179dSJan Kara EXPORT_SYMBOL(dquot_mark_dquot_dirty); 364884d179dSJan Kara 365dc52dd3aSDmitry Monakhov /* Dirtify all the dquots - this can block when journalling */ 366dc52dd3aSDmitry Monakhov static inline int mark_all_dquot_dirty(struct dquot * const *dquot) 367dc52dd3aSDmitry Monakhov { 368dc52dd3aSDmitry Monakhov int ret, err, cnt; 369dc52dd3aSDmitry Monakhov 370dc52dd3aSDmitry Monakhov ret = err = 0; 371dc52dd3aSDmitry Monakhov for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 372dc52dd3aSDmitry Monakhov if (dquot[cnt]) 373dc52dd3aSDmitry Monakhov /* Even in case of error we have to continue */ 374dc52dd3aSDmitry Monakhov ret = mark_dquot_dirty(dquot[cnt]); 375dc52dd3aSDmitry Monakhov if (!err) 376dc52dd3aSDmitry Monakhov err = ret; 377dc52dd3aSDmitry Monakhov } 378dc52dd3aSDmitry Monakhov return err; 379dc52dd3aSDmitry Monakhov } 380dc52dd3aSDmitry Monakhov 381dc52dd3aSDmitry Monakhov static inline void dqput_all(struct dquot **dquot) 382dc52dd3aSDmitry Monakhov { 383dc52dd3aSDmitry Monakhov unsigned int cnt; 384dc52dd3aSDmitry Monakhov 385dc52dd3aSDmitry Monakhov for (cnt = 0; cnt < MAXQUOTAS; cnt++) 386dc52dd3aSDmitry Monakhov dqput(dquot[cnt]); 387dc52dd3aSDmitry Monakhov } 388dc52dd3aSDmitry Monakhov 389884d179dSJan Kara static inline int clear_dquot_dirty(struct dquot *dquot) 390884d179dSJan Kara { 391834057bfSJan Kara if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NOLIST_DIRTY) 392834057bfSJan Kara return test_and_clear_bit(DQ_MOD_B, &dquot->dq_flags); 393834057bfSJan Kara 3941e0b7cb0SJan Kara spin_lock(&dq_list_lock); 3951e0b7cb0SJan Kara if (!test_and_clear_bit(DQ_MOD_B, &dquot->dq_flags)) { 3961e0b7cb0SJan Kara spin_unlock(&dq_list_lock); 397884d179dSJan Kara return 0; 3981e0b7cb0SJan Kara } 399884d179dSJan Kara list_del_init(&dquot->dq_dirty); 4001e0b7cb0SJan Kara spin_unlock(&dq_list_lock); 401884d179dSJan Kara return 1; 402884d179dSJan Kara } 403884d179dSJan Kara 404884d179dSJan Kara void mark_info_dirty(struct super_block *sb, int type) 405884d179dSJan Kara { 40615512377SJan Kara spin_lock(&dq_data_lock); 40715512377SJan Kara sb_dqopt(sb)->info[type].dqi_flags |= DQF_INFO_DIRTY; 40815512377SJan Kara spin_unlock(&dq_data_lock); 409884d179dSJan Kara } 410884d179dSJan Kara EXPORT_SYMBOL(mark_info_dirty); 411884d179dSJan Kara 412884d179dSJan Kara /* 413884d179dSJan Kara * Read dquot from disk and alloc space for it 414884d179dSJan Kara */ 415884d179dSJan Kara 416884d179dSJan Kara int dquot_acquire(struct dquot *dquot) 417884d179dSJan Kara { 418884d179dSJan Kara int ret = 0, ret2 = 0; 419884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); 420884d179dSJan Kara 421884d179dSJan Kara mutex_lock(&dquot->dq_lock); 422e342e38dSJan Kara if (!test_bit(DQ_READ_B, &dquot->dq_flags)) 4234c376dcaSEric W. Biederman ret = dqopt->ops[dquot->dq_id.type]->read_dqblk(dquot); 424884d179dSJan Kara if (ret < 0) 425884d179dSJan Kara goto out_iolock; 426044c9b67SJan Kara /* Make sure flags update is visible after dquot has been filled */ 427044c9b67SJan Kara smp_mb__before_atomic(); 428884d179dSJan Kara set_bit(DQ_READ_B, &dquot->dq_flags); 429884d179dSJan Kara /* Instantiate dquot if needed */ 430884d179dSJan Kara if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && !dquot->dq_off) { 4314c376dcaSEric W. Biederman ret = dqopt->ops[dquot->dq_id.type]->commit_dqblk(dquot); 432884d179dSJan Kara /* Write the info if needed */ 4334c376dcaSEric W. Biederman if (info_dirty(&dqopt->info[dquot->dq_id.type])) { 4344c376dcaSEric W. Biederman ret2 = dqopt->ops[dquot->dq_id.type]->write_file_info( 4354c376dcaSEric W. Biederman dquot->dq_sb, dquot->dq_id.type); 4368fc32c2bSJan Kara } 437884d179dSJan Kara if (ret < 0) 438884d179dSJan Kara goto out_iolock; 439884d179dSJan Kara if (ret2 < 0) { 440884d179dSJan Kara ret = ret2; 441884d179dSJan Kara goto out_iolock; 442884d179dSJan Kara } 443884d179dSJan Kara } 444044c9b67SJan Kara /* 445044c9b67SJan Kara * Make sure flags update is visible after on-disk struct has been 446044c9b67SJan Kara * allocated. Paired with smp_rmb() in dqget(). 447044c9b67SJan Kara */ 448044c9b67SJan Kara smp_mb__before_atomic(); 449884d179dSJan Kara set_bit(DQ_ACTIVE_B, &dquot->dq_flags); 450884d179dSJan Kara out_iolock: 451884d179dSJan Kara mutex_unlock(&dquot->dq_lock); 452884d179dSJan Kara return ret; 453884d179dSJan Kara } 454884d179dSJan Kara EXPORT_SYMBOL(dquot_acquire); 455884d179dSJan Kara 456884d179dSJan Kara /* 457884d179dSJan Kara * Write dquot to disk 458884d179dSJan Kara */ 459884d179dSJan Kara int dquot_commit(struct dquot *dquot) 460884d179dSJan Kara { 461b03f2456SJan Kara int ret = 0; 462884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); 463884d179dSJan Kara 4645e8cb9b6SJan Kara mutex_lock(&dquot->dq_lock); 4651e0b7cb0SJan Kara if (!clear_dquot_dirty(dquot)) 4665e8cb9b6SJan Kara goto out_lock; 467884d179dSJan Kara /* Inactive dquot can be only if there was error during read/init 468884d179dSJan Kara * => we have better not writing it */ 4698fc32c2bSJan Kara if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) 4704c376dcaSEric W. Biederman ret = dqopt->ops[dquot->dq_id.type]->commit_dqblk(dquot); 4718fc32c2bSJan Kara else 4725e8cb9b6SJan Kara ret = -EIO; 4735e8cb9b6SJan Kara out_lock: 4745e8cb9b6SJan Kara mutex_unlock(&dquot->dq_lock); 475884d179dSJan Kara return ret; 476884d179dSJan Kara } 477884d179dSJan Kara EXPORT_SYMBOL(dquot_commit); 478884d179dSJan Kara 479884d179dSJan Kara /* 480884d179dSJan Kara * Release dquot 481884d179dSJan Kara */ 482884d179dSJan Kara int dquot_release(struct dquot *dquot) 483884d179dSJan Kara { 484884d179dSJan Kara int ret = 0, ret2 = 0; 485884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); 486884d179dSJan Kara 487884d179dSJan Kara mutex_lock(&dquot->dq_lock); 488884d179dSJan Kara /* Check whether we are not racing with some other dqget() */ 489884d179dSJan Kara if (atomic_read(&dquot->dq_count) > 1) 490884d179dSJan Kara goto out_dqlock; 4914c376dcaSEric W. Biederman if (dqopt->ops[dquot->dq_id.type]->release_dqblk) { 4924c376dcaSEric W. Biederman ret = dqopt->ops[dquot->dq_id.type]->release_dqblk(dquot); 493884d179dSJan Kara /* Write the info */ 4944c376dcaSEric W. Biederman if (info_dirty(&dqopt->info[dquot->dq_id.type])) { 4954c376dcaSEric W. Biederman ret2 = dqopt->ops[dquot->dq_id.type]->write_file_info( 4964c376dcaSEric W. Biederman dquot->dq_sb, dquot->dq_id.type); 497268157baSJan Kara } 498884d179dSJan Kara if (ret >= 0) 499884d179dSJan Kara ret = ret2; 500884d179dSJan Kara } 501884d179dSJan Kara clear_bit(DQ_ACTIVE_B, &dquot->dq_flags); 502884d179dSJan Kara out_dqlock: 503884d179dSJan Kara mutex_unlock(&dquot->dq_lock); 504884d179dSJan Kara return ret; 505884d179dSJan Kara } 506884d179dSJan Kara EXPORT_SYMBOL(dquot_release); 507884d179dSJan Kara 508884d179dSJan Kara void dquot_destroy(struct dquot *dquot) 509884d179dSJan Kara { 510884d179dSJan Kara kmem_cache_free(dquot_cachep, dquot); 511884d179dSJan Kara } 512884d179dSJan Kara EXPORT_SYMBOL(dquot_destroy); 513884d179dSJan Kara 514884d179dSJan Kara static inline void do_destroy_dquot(struct dquot *dquot) 515884d179dSJan Kara { 516884d179dSJan Kara dquot->dq_sb->dq_op->destroy_dquot(dquot); 517884d179dSJan Kara } 518884d179dSJan Kara 519884d179dSJan Kara /* Invalidate all dquots on the list. Note that this function is called after 520884d179dSJan Kara * quota is disabled and pointers from inodes removed so there cannot be new 521884d179dSJan Kara * quota users. There can still be some users of quotas due to inodes being 522884d179dSJan Kara * just deleted or pruned by prune_icache() (those are not attached to any 523884d179dSJan Kara * list) or parallel quotactl call. We have to wait for such users. 524884d179dSJan Kara */ 525884d179dSJan Kara static void invalidate_dquots(struct super_block *sb, int type) 526884d179dSJan Kara { 527884d179dSJan Kara struct dquot *dquot, *tmp; 528884d179dSJan Kara 529884d179dSJan Kara restart: 530884d179dSJan Kara spin_lock(&dq_list_lock); 531884d179dSJan Kara list_for_each_entry_safe(dquot, tmp, &inuse_list, dq_inuse) { 532884d179dSJan Kara if (dquot->dq_sb != sb) 533884d179dSJan Kara continue; 5344c376dcaSEric W. Biederman if (dquot->dq_id.type != type) 535884d179dSJan Kara continue; 536884d179dSJan Kara /* Wait for dquot users */ 537884d179dSJan Kara if (atomic_read(&dquot->dq_count)) { 5389f985cb6SJan Kara dqgrab(dquot); 539884d179dSJan Kara spin_unlock(&dq_list_lock); 540503330f3SJan Kara /* 541503330f3SJan Kara * Once dqput() wakes us up, we know it's time to free 542884d179dSJan Kara * the dquot. 543884d179dSJan Kara * IMPORTANT: we rely on the fact that there is always 544884d179dSJan Kara * at most one process waiting for dquot to free. 545884d179dSJan Kara * Otherwise dq_count would be > 1 and we would never 546884d179dSJan Kara * wake up. 547884d179dSJan Kara */ 548503330f3SJan Kara wait_event(dquot_ref_wq, 549503330f3SJan Kara atomic_read(&dquot->dq_count) == 1); 550884d179dSJan Kara dqput(dquot); 551884d179dSJan Kara /* At this moment dquot() need not exist (it could be 552884d179dSJan Kara * reclaimed by prune_dqcache(). Hence we must 553884d179dSJan Kara * restart. */ 554884d179dSJan Kara goto restart; 555884d179dSJan Kara } 556884d179dSJan Kara /* 557884d179dSJan Kara * Quota now has no users and it has been written on last 558884d179dSJan Kara * dqput() 559884d179dSJan Kara */ 560884d179dSJan Kara remove_dquot_hash(dquot); 561884d179dSJan Kara remove_free_dquot(dquot); 562884d179dSJan Kara remove_inuse(dquot); 563884d179dSJan Kara do_destroy_dquot(dquot); 564884d179dSJan Kara } 565884d179dSJan Kara spin_unlock(&dq_list_lock); 566884d179dSJan Kara } 567884d179dSJan Kara 568884d179dSJan Kara /* Call callback for every active dquot on given filesystem */ 569884d179dSJan Kara int dquot_scan_active(struct super_block *sb, 570884d179dSJan Kara int (*fn)(struct dquot *dquot, unsigned long priv), 571884d179dSJan Kara unsigned long priv) 572884d179dSJan Kara { 573884d179dSJan Kara struct dquot *dquot, *old_dquot = NULL; 574884d179dSJan Kara int ret = 0; 575884d179dSJan Kara 576ee1ac541SJan Kara WARN_ON_ONCE(!rwsem_is_locked(&sb->s_umount)); 577ee1ac541SJan Kara 578884d179dSJan Kara spin_lock(&dq_list_lock); 579884d179dSJan Kara list_for_each_entry(dquot, &inuse_list, dq_inuse) { 580884d179dSJan Kara if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) 581884d179dSJan Kara continue; 582884d179dSJan Kara if (dquot->dq_sb != sb) 583884d179dSJan Kara continue; 584884d179dSJan Kara /* Now we have active dquot so we can just increase use count */ 585884d179dSJan Kara atomic_inc(&dquot->dq_count); 586884d179dSJan Kara spin_unlock(&dq_list_lock); 587dde95888SDmitry Monakhov dqstats_inc(DQST_LOOKUPS); 588884d179dSJan Kara dqput(old_dquot); 589884d179dSJan Kara old_dquot = dquot; 5901362f4eaSJan Kara /* 5911362f4eaSJan Kara * ->release_dquot() can be racing with us. Our reference 5921362f4eaSJan Kara * protects us from new calls to it so just wait for any 5931362f4eaSJan Kara * outstanding call and recheck the DQ_ACTIVE_B after that. 5941362f4eaSJan Kara */ 5951362f4eaSJan Kara wait_on_dquot(dquot); 5961362f4eaSJan Kara if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { 597884d179dSJan Kara ret = fn(dquot, priv); 598884d179dSJan Kara if (ret < 0) 599884d179dSJan Kara goto out; 6001362f4eaSJan Kara } 601884d179dSJan Kara spin_lock(&dq_list_lock); 602884d179dSJan Kara /* We are safe to continue now because our dquot could not 603884d179dSJan Kara * be moved out of the inuse list while we hold the reference */ 604884d179dSJan Kara } 605884d179dSJan Kara spin_unlock(&dq_list_lock); 606884d179dSJan Kara out: 607884d179dSJan Kara dqput(old_dquot); 608884d179dSJan Kara return ret; 609884d179dSJan Kara } 610884d179dSJan Kara EXPORT_SYMBOL(dquot_scan_active); 611884d179dSJan Kara 612ceed1723SJan Kara /* Write all dquot structures to quota files */ 613ceed1723SJan Kara int dquot_writeback_dquots(struct super_block *sb, int type) 614884d179dSJan Kara { 615884d179dSJan Kara struct list_head *dirty; 616884d179dSJan Kara struct dquot *dquot; 617884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 618884d179dSJan Kara int cnt; 619ceed1723SJan Kara int err, ret = 0; 620884d179dSJan Kara 6219d1ccbe7SJan Kara WARN_ON_ONCE(!rwsem_is_locked(&sb->s_umount)); 6229d1ccbe7SJan Kara 623884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 624884d179dSJan Kara if (type != -1 && cnt != type) 625884d179dSJan Kara continue; 626884d179dSJan Kara if (!sb_has_quota_active(sb, cnt)) 627884d179dSJan Kara continue; 628884d179dSJan Kara spin_lock(&dq_list_lock); 629884d179dSJan Kara dirty = &dqopt->info[cnt].dqi_dirty_list; 630884d179dSJan Kara while (!list_empty(dirty)) { 631268157baSJan Kara dquot = list_first_entry(dirty, struct dquot, 632268157baSJan Kara dq_dirty); 6334580b30eSJan Kara 6344580b30eSJan Kara WARN_ON(!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)); 6354580b30eSJan Kara 636884d179dSJan Kara /* Now we have active dquot from which someone is 637884d179dSJan Kara * holding reference so we can safely just increase 638884d179dSJan Kara * use count */ 6399f985cb6SJan Kara dqgrab(dquot); 640884d179dSJan Kara spin_unlock(&dq_list_lock); 641dde95888SDmitry Monakhov dqstats_inc(DQST_LOOKUPS); 642ceed1723SJan Kara err = sb->dq_op->write_dquot(dquot); 643ceed1723SJan Kara if (!ret && err) 644474d2605SJan Kara ret = err; 645884d179dSJan Kara dqput(dquot); 646884d179dSJan Kara spin_lock(&dq_list_lock); 647884d179dSJan Kara } 648884d179dSJan Kara spin_unlock(&dq_list_lock); 649884d179dSJan Kara } 650884d179dSJan Kara 651884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 652884d179dSJan Kara if ((cnt == type || type == -1) && sb_has_quota_active(sb, cnt) 653884d179dSJan Kara && info_dirty(&dqopt->info[cnt])) 654884d179dSJan Kara sb->dq_op->write_info(sb, cnt); 655dde95888SDmitry Monakhov dqstats_inc(DQST_SYNCS); 656884d179dSJan Kara 657ceed1723SJan Kara return ret; 658ceed1723SJan Kara } 659ceed1723SJan Kara EXPORT_SYMBOL(dquot_writeback_dquots); 660ceed1723SJan Kara 661ceed1723SJan Kara /* Write all dquot structures to disk and make them visible from userspace */ 662ceed1723SJan Kara int dquot_quota_sync(struct super_block *sb, int type) 663ceed1723SJan Kara { 664ceed1723SJan Kara struct quota_info *dqopt = sb_dqopt(sb); 665ceed1723SJan Kara int cnt; 666ceed1723SJan Kara int ret; 667ceed1723SJan Kara 668ceed1723SJan Kara ret = dquot_writeback_dquots(sb, type); 669ceed1723SJan Kara if (ret) 670ceed1723SJan Kara return ret; 671ceed1723SJan Kara if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) 6725fb324adSChristoph Hellwig return 0; 6735fb324adSChristoph Hellwig 6745fb324adSChristoph Hellwig /* This is not very clever (and fast) but currently I don't know about 6755fb324adSChristoph Hellwig * any other simple way of getting quota data to disk and we must get 6765fb324adSChristoph Hellwig * them there for userspace to be visible... */ 6775fb324adSChristoph Hellwig if (sb->s_op->sync_fs) 6785fb324adSChristoph Hellwig sb->s_op->sync_fs(sb, 1); 6795fb324adSChristoph Hellwig sync_blockdev(sb->s_bdev); 6805fb324adSChristoph Hellwig 6815fb324adSChristoph Hellwig /* 6825fb324adSChristoph Hellwig * Now when everything is written we can discard the pagecache so 6835fb324adSChristoph Hellwig * that userspace sees the changes. 6845fb324adSChristoph Hellwig */ 6855fb324adSChristoph Hellwig for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 6865fb324adSChristoph Hellwig if (type != -1 && cnt != type) 6875fb324adSChristoph Hellwig continue; 6885fb324adSChristoph Hellwig if (!sb_has_quota_active(sb, cnt)) 6895fb324adSChristoph Hellwig continue; 6905955102cSAl Viro inode_lock(dqopt->files[cnt]); 691f9ef1784SJan Kara truncate_inode_pages(&dqopt->files[cnt]->i_data, 0); 6925955102cSAl Viro inode_unlock(dqopt->files[cnt]); 6935fb324adSChristoph Hellwig } 6945fb324adSChristoph Hellwig 695884d179dSJan Kara return 0; 696884d179dSJan Kara } 697287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_quota_sync); 698884d179dSJan Kara 6991ab6c499SDave Chinner static unsigned long 7001ab6c499SDave Chinner dqcache_shrink_scan(struct shrinker *shrink, struct shrink_control *sc) 701884d179dSJan Kara { 702884d179dSJan Kara struct list_head *head; 703884d179dSJan Kara struct dquot *dquot; 7041ab6c499SDave Chinner unsigned long freed = 0; 705884d179dSJan Kara 706d68aab6bSNiu Yawei spin_lock(&dq_list_lock); 707884d179dSJan Kara head = free_dquots.prev; 7081ab6c499SDave Chinner while (head != &free_dquots && sc->nr_to_scan) { 709884d179dSJan Kara dquot = list_entry(head, struct dquot, dq_free); 710884d179dSJan Kara remove_dquot_hash(dquot); 711884d179dSJan Kara remove_free_dquot(dquot); 712884d179dSJan Kara remove_inuse(dquot); 713884d179dSJan Kara do_destroy_dquot(dquot); 7141ab6c499SDave Chinner sc->nr_to_scan--; 7151ab6c499SDave Chinner freed++; 716884d179dSJan Kara head = free_dquots.prev; 717884d179dSJan Kara } 718d68aab6bSNiu Yawei spin_unlock(&dq_list_lock); 7191ab6c499SDave Chinner return freed; 720884d179dSJan Kara } 721884d179dSJan Kara 7221ab6c499SDave Chinner static unsigned long 7231ab6c499SDave Chinner dqcache_shrink_count(struct shrinker *shrink, struct shrink_control *sc) 724884d179dSJan Kara { 72555f841ceSGlauber Costa return vfs_pressure_ratio( 72655f841ceSGlauber Costa percpu_counter_read_positive(&dqstats.counter[DQST_FREE_DQUOTS])); 727884d179dSJan Kara } 728884d179dSJan Kara 729884d179dSJan Kara static struct shrinker dqcache_shrinker = { 7301ab6c499SDave Chinner .count_objects = dqcache_shrink_count, 7311ab6c499SDave Chinner .scan_objects = dqcache_shrink_scan, 732884d179dSJan Kara .seeks = DEFAULT_SEEKS, 733884d179dSJan Kara }; 734884d179dSJan Kara 735884d179dSJan Kara /* 736884d179dSJan Kara * Put reference to dquot 737884d179dSJan Kara */ 738884d179dSJan Kara void dqput(struct dquot *dquot) 739884d179dSJan Kara { 740884d179dSJan Kara int ret; 741884d179dSJan Kara 742884d179dSJan Kara if (!dquot) 743884d179dSJan Kara return; 74462af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 745884d179dSJan Kara if (!atomic_read(&dquot->dq_count)) { 746fb5ffb0eSJiaying Zhang quota_error(dquot->dq_sb, "trying to free free dquot of %s %d", 7474c376dcaSEric W. Biederman quotatypes[dquot->dq_id.type], 7484c376dcaSEric W. Biederman from_kqid(&init_user_ns, dquot->dq_id)); 749884d179dSJan Kara BUG(); 750884d179dSJan Kara } 751884d179dSJan Kara #endif 752dde95888SDmitry Monakhov dqstats_inc(DQST_DROPS); 753884d179dSJan Kara we_slept: 754884d179dSJan Kara spin_lock(&dq_list_lock); 755884d179dSJan Kara if (atomic_read(&dquot->dq_count) > 1) { 756884d179dSJan Kara /* We have more than one user... nothing to do */ 757884d179dSJan Kara atomic_dec(&dquot->dq_count); 758884d179dSJan Kara /* Releasing dquot during quotaoff phase? */ 7594c376dcaSEric W. Biederman if (!sb_has_quota_active(dquot->dq_sb, dquot->dq_id.type) && 760884d179dSJan Kara atomic_read(&dquot->dq_count) == 1) 761503330f3SJan Kara wake_up(&dquot_ref_wq); 762884d179dSJan Kara spin_unlock(&dq_list_lock); 763884d179dSJan Kara return; 764884d179dSJan Kara } 765884d179dSJan Kara /* Need to release dquot? */ 7664580b30eSJan Kara if (dquot_dirty(dquot)) { 767884d179dSJan Kara spin_unlock(&dq_list_lock); 768884d179dSJan Kara /* Commit dquot before releasing */ 769884d179dSJan Kara ret = dquot->dq_sb->dq_op->write_dquot(dquot); 770884d179dSJan Kara if (ret < 0) { 771fb5ffb0eSJiaying Zhang quota_error(dquot->dq_sb, "Can't write quota structure" 772fb5ffb0eSJiaying Zhang " (error %d). Quota may get out of sync!", 773fb5ffb0eSJiaying Zhang ret); 774884d179dSJan Kara /* 775884d179dSJan Kara * We clear dirty bit anyway, so that we avoid 776884d179dSJan Kara * infinite loop here 777884d179dSJan Kara */ 778884d179dSJan Kara clear_dquot_dirty(dquot); 779884d179dSJan Kara } 780884d179dSJan Kara goto we_slept; 781884d179dSJan Kara } 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 dquot->dq_sb = sb; 8171a06d420SEric W. Biederman dquot->dq_id = make_kqid_invalid(type); 818884d179dSJan Kara atomic_set(&dquot->dq_count, 1); 819884d179dSJan Kara 820884d179dSJan Kara return dquot; 821884d179dSJan Kara } 822884d179dSJan Kara 823884d179dSJan Kara /* 824884d179dSJan Kara * Get reference to dquot 825884d179dSJan Kara * 826884d179dSJan Kara * Locking is slightly tricky here. We are guarded from parallel quotaoff() 827884d179dSJan Kara * destroying our dquot by: 828884d179dSJan Kara * a) checking for quota flags under dq_list_lock and 829884d179dSJan Kara * b) getting a reference to dquot before we release dq_list_lock 830884d179dSJan Kara */ 831aca645a6SEric W. Biederman struct dquot *dqget(struct super_block *sb, struct kqid qid) 832884d179dSJan Kara { 8331a06d420SEric W. Biederman unsigned int hashent = hashfn(sb, qid); 8346184fc0bSJan Kara struct dquot *dquot, *empty = NULL; 835884d179dSJan Kara 836d49d3762SEric W. Biederman if (!qid_has_mapping(sb->s_user_ns, qid)) 837d49d3762SEric W. Biederman return ERR_PTR(-EINVAL); 838d49d3762SEric W. Biederman 8391a06d420SEric W. Biederman if (!sb_has_quota_active(sb, qid.type)) 8406184fc0bSJan Kara return ERR_PTR(-ESRCH); 841884d179dSJan Kara we_slept: 842884d179dSJan Kara spin_lock(&dq_list_lock); 843884d179dSJan Kara spin_lock(&dq_state_lock); 8441a06d420SEric W. Biederman if (!sb_has_quota_active(sb, qid.type)) { 845884d179dSJan Kara spin_unlock(&dq_state_lock); 846884d179dSJan Kara spin_unlock(&dq_list_lock); 8476184fc0bSJan Kara dquot = ERR_PTR(-ESRCH); 848884d179dSJan Kara goto out; 849884d179dSJan Kara } 850884d179dSJan Kara spin_unlock(&dq_state_lock); 851884d179dSJan Kara 8521a06d420SEric W. Biederman dquot = find_dquot(hashent, sb, qid); 853dd6f3c6dSJan Kara if (!dquot) { 854dd6f3c6dSJan Kara if (!empty) { 855884d179dSJan Kara spin_unlock(&dq_list_lock); 8561a06d420SEric W. Biederman empty = get_empty_dquot(sb, qid.type); 857dd6f3c6dSJan Kara if (!empty) 858884d179dSJan Kara schedule(); /* Try to wait for a moment... */ 859884d179dSJan Kara goto we_slept; 860884d179dSJan Kara } 861884d179dSJan Kara dquot = empty; 862dd6f3c6dSJan Kara empty = NULL; 8634c376dcaSEric W. Biederman dquot->dq_id = qid; 864884d179dSJan Kara /* all dquots go on the inuse_list */ 865884d179dSJan Kara put_inuse(dquot); 866884d179dSJan Kara /* hash it first so it can be found */ 867884d179dSJan Kara insert_dquot_hash(dquot); 868884d179dSJan Kara spin_unlock(&dq_list_lock); 869dde95888SDmitry Monakhov dqstats_inc(DQST_LOOKUPS); 870884d179dSJan Kara } else { 871884d179dSJan Kara if (!atomic_read(&dquot->dq_count)) 872884d179dSJan Kara remove_free_dquot(dquot); 873884d179dSJan Kara atomic_inc(&dquot->dq_count); 874884d179dSJan Kara spin_unlock(&dq_list_lock); 875dde95888SDmitry Monakhov dqstats_inc(DQST_CACHE_HITS); 876dde95888SDmitry Monakhov dqstats_inc(DQST_LOOKUPS); 877884d179dSJan Kara } 878268157baSJan Kara /* Wait for dq_lock - after this we know that either dquot_release() is 879268157baSJan Kara * already finished or it will be canceled due to dq_count > 1 test */ 880884d179dSJan Kara wait_on_dquot(dquot); 881268157baSJan Kara /* Read the dquot / allocate space in quota file */ 8826184fc0bSJan Kara if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { 8836184fc0bSJan Kara int err; 8846184fc0bSJan Kara 8856184fc0bSJan Kara err = sb->dq_op->acquire_dquot(dquot); 8866184fc0bSJan Kara if (err < 0) { 887884d179dSJan Kara dqput(dquot); 8886184fc0bSJan Kara dquot = ERR_PTR(err); 889884d179dSJan Kara goto out; 890884d179dSJan Kara } 8916184fc0bSJan Kara } 892044c9b67SJan Kara /* 893044c9b67SJan Kara * Make sure following reads see filled structure - paired with 894044c9b67SJan Kara * smp_mb__before_atomic() in dquot_acquire(). 895044c9b67SJan Kara */ 896044c9b67SJan Kara smp_rmb(); 89762af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 898884d179dSJan Kara BUG_ON(!dquot->dq_sb); /* Has somebody invalidated entry under us? */ 899884d179dSJan Kara #endif 900884d179dSJan Kara out: 901884d179dSJan Kara if (empty) 902884d179dSJan Kara do_destroy_dquot(empty); 903884d179dSJan Kara 904884d179dSJan Kara return dquot; 905884d179dSJan Kara } 906884d179dSJan Kara EXPORT_SYMBOL(dqget); 907884d179dSJan Kara 9082d0fa467SJan Kara static inline struct dquot **i_dquot(struct inode *inode) 9092d0fa467SJan Kara { 9102d0fa467SJan Kara return inode->i_sb->s_op->get_dquots(inode); 9112d0fa467SJan Kara } 9122d0fa467SJan Kara 913884d179dSJan Kara static int dqinit_needed(struct inode *inode, int type) 914884d179dSJan Kara { 9155bcd3b6fSKonstantin Khlebnikov struct dquot * const *dquots; 916884d179dSJan Kara int cnt; 917884d179dSJan Kara 918884d179dSJan Kara if (IS_NOQUOTA(inode)) 919884d179dSJan Kara return 0; 9205bcd3b6fSKonstantin Khlebnikov 9215bcd3b6fSKonstantin Khlebnikov dquots = i_dquot(inode); 922884d179dSJan Kara if (type != -1) 9235bcd3b6fSKonstantin Khlebnikov return !dquots[type]; 924884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 9255bcd3b6fSKonstantin Khlebnikov if (!dquots[cnt]) 926884d179dSJan Kara return 1; 927884d179dSJan Kara return 0; 928884d179dSJan Kara } 929884d179dSJan Kara 930c3b00446SJan Kara /* This routine is guarded by s_umount semaphore */ 931884d179dSJan Kara static void add_dquot_ref(struct super_block *sb, int type) 932884d179dSJan Kara { 933884d179dSJan Kara struct inode *inode, *old_inode = NULL; 93462af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 9350a5a9c72SJan Kara int reserved = 0; 9364c5e6c0eSJan Kara #endif 937884d179dSJan Kara 93874278da9SDave Chinner spin_lock(&sb->s_inode_list_lock); 939884d179dSJan Kara list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { 940250df6edSDave Chinner spin_lock(&inode->i_lock); 941250df6edSDave Chinner if ((inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW)) || 942250df6edSDave Chinner !atomic_read(&inode->i_writecount) || 943250df6edSDave Chinner !dqinit_needed(inode, type)) { 944250df6edSDave Chinner spin_unlock(&inode->i_lock); 9453ae5080fSLinus Torvalds continue; 946250df6edSDave Chinner } 947884d179dSJan Kara __iget(inode); 948250df6edSDave Chinner spin_unlock(&inode->i_lock); 94974278da9SDave Chinner spin_unlock(&sb->s_inode_list_lock); 950884d179dSJan Kara 951d7e97117SJan Kara #ifdef CONFIG_QUOTA_DEBUG 952d7e97117SJan Kara if (unlikely(inode_get_rsv_space(inode) > 0)) 953d7e97117SJan Kara reserved = 1; 954d7e97117SJan Kara #endif 955884d179dSJan Kara iput(old_inode); 956871a2931SChristoph Hellwig __dquot_initialize(inode, type); 95755fa6091SDave Chinner 95855fa6091SDave Chinner /* 95955fa6091SDave Chinner * We hold a reference to 'inode' so it couldn't have been 96055fa6091SDave Chinner * removed from s_inodes list while we dropped the 96174278da9SDave Chinner * s_inode_list_lock. We cannot iput the inode now as we can be 96255fa6091SDave Chinner * holding the last reference and we cannot iput it under 96374278da9SDave Chinner * s_inode_list_lock. So we keep the reference and iput it 96455fa6091SDave Chinner * later. 96555fa6091SDave Chinner */ 966884d179dSJan Kara old_inode = inode; 96774278da9SDave Chinner spin_lock(&sb->s_inode_list_lock); 968884d179dSJan Kara } 96974278da9SDave Chinner spin_unlock(&sb->s_inode_list_lock); 970884d179dSJan Kara iput(old_inode); 9710a5a9c72SJan Kara 97262af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 9730a5a9c72SJan Kara if (reserved) { 974fb5ffb0eSJiaying Zhang quota_error(sb, "Writes happened before quota was turned on " 975fb5ffb0eSJiaying Zhang "thus quota information is probably inconsistent. " 976fb5ffb0eSJiaying Zhang "Please run quotacheck(8)"); 9770a5a9c72SJan Kara } 9784c5e6c0eSJan Kara #endif 979884d179dSJan Kara } 980884d179dSJan Kara 981268157baSJan Kara /* 982268157baSJan Kara * Remove references to dquots from inode and add dquot to list for freeing 98325985edcSLucas De Marchi * if we have the last reference to dquot 984268157baSJan Kara */ 9859eb6463fSNiu Yawei static void remove_inode_dquot_ref(struct inode *inode, int type, 986884d179dSJan Kara struct list_head *tofree_head) 987884d179dSJan Kara { 9885bcd3b6fSKonstantin Khlebnikov struct dquot **dquots = i_dquot(inode); 9895bcd3b6fSKonstantin Khlebnikov struct dquot *dquot = dquots[type]; 990884d179dSJan Kara 9919eb6463fSNiu Yawei if (!dquot) 9929eb6463fSNiu Yawei return; 9939eb6463fSNiu Yawei 9945bcd3b6fSKonstantin Khlebnikov dquots[type] = NULL; 9959eb6463fSNiu Yawei if (list_empty(&dquot->dq_free)) { 9969eb6463fSNiu Yawei /* 9979eb6463fSNiu Yawei * The inode still has reference to dquot so it can't be in the 9989eb6463fSNiu Yawei * free list 9999eb6463fSNiu Yawei */ 1000884d179dSJan Kara spin_lock(&dq_list_lock); 1001268157baSJan Kara list_add(&dquot->dq_free, tofree_head); 1002884d179dSJan Kara spin_unlock(&dq_list_lock); 10039eb6463fSNiu Yawei } else { 10049eb6463fSNiu Yawei /* 10059eb6463fSNiu Yawei * Dquot is already in a list to put so we won't drop the last 10069eb6463fSNiu Yawei * reference here. 10079eb6463fSNiu Yawei */ 10089eb6463fSNiu Yawei dqput(dquot); 1009884d179dSJan Kara } 1010884d179dSJan Kara } 1011884d179dSJan Kara 1012268157baSJan Kara /* 1013268157baSJan Kara * Free list of dquots 1014268157baSJan Kara * Dquots are removed from inodes and no new references can be got so we are 1015268157baSJan Kara * the only ones holding reference 1016268157baSJan Kara */ 1017884d179dSJan Kara static void put_dquot_list(struct list_head *tofree_head) 1018884d179dSJan Kara { 1019884d179dSJan Kara struct list_head *act_head; 1020884d179dSJan Kara struct dquot *dquot; 1021884d179dSJan Kara 1022884d179dSJan Kara act_head = tofree_head->next; 1023884d179dSJan Kara while (act_head != tofree_head) { 1024884d179dSJan Kara dquot = list_entry(act_head, struct dquot, dq_free); 1025884d179dSJan Kara act_head = act_head->next; 1026268157baSJan Kara /* Remove dquot from the list so we won't have problems... */ 1027268157baSJan Kara list_del_init(&dquot->dq_free); 1028884d179dSJan Kara dqput(dquot); 1029884d179dSJan Kara } 1030884d179dSJan Kara } 1031884d179dSJan Kara 1032884d179dSJan Kara static void remove_dquot_ref(struct super_block *sb, int type, 1033884d179dSJan Kara struct list_head *tofree_head) 1034884d179dSJan Kara { 1035884d179dSJan Kara struct inode *inode; 10367af9cce8SDmitry Monakhov int reserved = 0; 1037884d179dSJan Kara 103874278da9SDave Chinner spin_lock(&sb->s_inode_list_lock); 1039884d179dSJan Kara list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { 10403ae5080fSLinus Torvalds /* 10413ae5080fSLinus Torvalds * We have to scan also I_NEW inodes because they can already 10423ae5080fSLinus Torvalds * have quota pointer initialized. Luckily, we need to touch 10433ae5080fSLinus Torvalds * only quota pointers and these have separate locking 1044b9ba6f94SNiu Yawei * (dq_data_lock). 10453ae5080fSLinus Torvalds */ 1046b9ba6f94SNiu Yawei spin_lock(&dq_data_lock); 10477af9cce8SDmitry Monakhov if (!IS_NOQUOTA(inode)) { 10487af9cce8SDmitry Monakhov if (unlikely(inode_get_rsv_space(inode) > 0)) 10497af9cce8SDmitry Monakhov reserved = 1; 1050884d179dSJan Kara remove_inode_dquot_ref(inode, type, tofree_head); 1051884d179dSJan Kara } 1052b9ba6f94SNiu Yawei spin_unlock(&dq_data_lock); 10537af9cce8SDmitry Monakhov } 105474278da9SDave Chinner spin_unlock(&sb->s_inode_list_lock); 10557af9cce8SDmitry Monakhov #ifdef CONFIG_QUOTA_DEBUG 10567af9cce8SDmitry Monakhov if (reserved) { 10577af9cce8SDmitry Monakhov printk(KERN_WARNING "VFS (%s): Writes happened after quota" 10587af9cce8SDmitry Monakhov " was disabled thus quota information is probably " 10597af9cce8SDmitry Monakhov "inconsistent. Please run quotacheck(8).\n", sb->s_id); 10607af9cce8SDmitry Monakhov } 10617af9cce8SDmitry Monakhov #endif 1062884d179dSJan Kara } 1063884d179dSJan Kara 1064884d179dSJan Kara /* Gather all references from inodes and drop them */ 1065884d179dSJan Kara static void drop_dquot_ref(struct super_block *sb, int type) 1066884d179dSJan Kara { 1067884d179dSJan Kara LIST_HEAD(tofree_head); 1068884d179dSJan Kara 1069884d179dSJan Kara if (sb->dq_op) { 1070884d179dSJan Kara remove_dquot_ref(sb, type, &tofree_head); 1071b9ba6f94SNiu Yawei synchronize_srcu(&dquot_srcu); 1072884d179dSJan Kara put_dquot_list(&tofree_head); 1073884d179dSJan Kara } 1074884d179dSJan Kara } 1075884d179dSJan Kara 1076884d179dSJan Kara static inline void dquot_incr_inodes(struct dquot *dquot, qsize_t number) 1077884d179dSJan Kara { 1078884d179dSJan Kara dquot->dq_dqb.dqb_curinodes += number; 1079884d179dSJan Kara } 1080884d179dSJan Kara 1081884d179dSJan Kara static inline void dquot_incr_space(struct dquot *dquot, qsize_t number) 1082884d179dSJan Kara { 1083884d179dSJan Kara dquot->dq_dqb.dqb_curspace += number; 1084884d179dSJan Kara } 1085884d179dSJan Kara 1086884d179dSJan Kara static inline void dquot_resv_space(struct dquot *dquot, qsize_t number) 1087884d179dSJan Kara { 1088884d179dSJan Kara dquot->dq_dqb.dqb_rsvspace += number; 1089884d179dSJan Kara } 1090884d179dSJan Kara 1091884d179dSJan Kara /* 1092884d179dSJan Kara * Claim reserved quota space 1093884d179dSJan Kara */ 10940a5a9c72SJan Kara static void dquot_claim_reserved_space(struct dquot *dquot, qsize_t number) 1095884d179dSJan Kara { 10960a5a9c72SJan Kara if (dquot->dq_dqb.dqb_rsvspace < number) { 10970a5a9c72SJan Kara WARN_ON_ONCE(1); 10980a5a9c72SJan Kara number = dquot->dq_dqb.dqb_rsvspace; 10990a5a9c72SJan Kara } 1100884d179dSJan Kara dquot->dq_dqb.dqb_curspace += number; 1101884d179dSJan Kara dquot->dq_dqb.dqb_rsvspace -= number; 1102884d179dSJan Kara } 1103884d179dSJan Kara 11041c8924ebSJan Kara static void dquot_reclaim_reserved_space(struct dquot *dquot, qsize_t number) 11051c8924ebSJan Kara { 11061c8924ebSJan Kara if (WARN_ON_ONCE(dquot->dq_dqb.dqb_curspace < number)) 11071c8924ebSJan Kara number = dquot->dq_dqb.dqb_curspace; 11081c8924ebSJan Kara dquot->dq_dqb.dqb_rsvspace += number; 11091c8924ebSJan Kara dquot->dq_dqb.dqb_curspace -= number; 11101c8924ebSJan Kara } 11111c8924ebSJan Kara 1112884d179dSJan Kara static inline 1113884d179dSJan Kara void dquot_free_reserved_space(struct dquot *dquot, qsize_t number) 1114884d179dSJan Kara { 11150a5a9c72SJan Kara if (dquot->dq_dqb.dqb_rsvspace >= number) 1116884d179dSJan Kara dquot->dq_dqb.dqb_rsvspace -= number; 11170a5a9c72SJan Kara else { 11180a5a9c72SJan Kara WARN_ON_ONCE(1); 11190a5a9c72SJan Kara dquot->dq_dqb.dqb_rsvspace = 0; 11200a5a9c72SJan Kara } 1121884d179dSJan Kara } 1122884d179dSJan Kara 11237a2435d8SJan Kara static void dquot_decr_inodes(struct dquot *dquot, qsize_t number) 1124884d179dSJan Kara { 1125884d179dSJan Kara if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE || 1126884d179dSJan Kara dquot->dq_dqb.dqb_curinodes >= number) 1127884d179dSJan Kara dquot->dq_dqb.dqb_curinodes -= number; 1128884d179dSJan Kara else 1129884d179dSJan Kara dquot->dq_dqb.dqb_curinodes = 0; 1130884d179dSJan Kara if (dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit) 1131e008bb61SArnd Bergmann dquot->dq_dqb.dqb_itime = (time64_t) 0; 1132884d179dSJan Kara clear_bit(DQ_INODES_B, &dquot->dq_flags); 1133884d179dSJan Kara } 1134884d179dSJan Kara 11357a2435d8SJan Kara static void dquot_decr_space(struct dquot *dquot, qsize_t number) 1136884d179dSJan Kara { 1137884d179dSJan Kara if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE || 1138884d179dSJan Kara dquot->dq_dqb.dqb_curspace >= number) 1139884d179dSJan Kara dquot->dq_dqb.dqb_curspace -= number; 1140884d179dSJan Kara else 1141884d179dSJan Kara dquot->dq_dqb.dqb_curspace = 0; 1142884d179dSJan Kara if (dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit) 1143e008bb61SArnd Bergmann dquot->dq_dqb.dqb_btime = (time64_t) 0; 1144884d179dSJan Kara clear_bit(DQ_BLKS_B, &dquot->dq_flags); 1145884d179dSJan Kara } 1146884d179dSJan Kara 1147bf097aafSJan Kara struct dquot_warn { 1148bf097aafSJan Kara struct super_block *w_sb; 11497b9c7321SEric W. Biederman struct kqid w_dq_id; 1150bf097aafSJan Kara short w_type; 1151bf097aafSJan Kara }; 1152bf097aafSJan Kara 1153884d179dSJan Kara static int warning_issued(struct dquot *dquot, const int warntype) 1154884d179dSJan Kara { 1155884d179dSJan Kara int flag = (warntype == QUOTA_NL_BHARDWARN || 1156884d179dSJan Kara warntype == QUOTA_NL_BSOFTLONGWARN) ? DQ_BLKS_B : 1157884d179dSJan Kara ((warntype == QUOTA_NL_IHARDWARN || 1158884d179dSJan Kara warntype == QUOTA_NL_ISOFTLONGWARN) ? DQ_INODES_B : 0); 1159884d179dSJan Kara 1160884d179dSJan Kara if (!flag) 1161884d179dSJan Kara return 0; 1162884d179dSJan Kara return test_and_set_bit(flag, &dquot->dq_flags); 1163884d179dSJan Kara } 1164884d179dSJan Kara 1165884d179dSJan Kara #ifdef CONFIG_PRINT_QUOTA_WARNING 1166884d179dSJan Kara static int flag_print_warnings = 1; 1167884d179dSJan Kara 1168bf097aafSJan Kara static int need_print_warning(struct dquot_warn *warn) 1169884d179dSJan Kara { 1170884d179dSJan Kara if (!flag_print_warnings) 1171884d179dSJan Kara return 0; 1172884d179dSJan Kara 11737b9c7321SEric W. Biederman switch (warn->w_dq_id.type) { 1174884d179dSJan Kara case USRQUOTA: 11751a06d420SEric W. Biederman return uid_eq(current_fsuid(), warn->w_dq_id.uid); 1176884d179dSJan Kara case GRPQUOTA: 11777b9c7321SEric W. Biederman return in_group_p(warn->w_dq_id.gid); 1178847aac64SLi Xi case PRJQUOTA: 1179847aac64SLi Xi return 1; 1180884d179dSJan Kara } 1181884d179dSJan Kara return 0; 1182884d179dSJan Kara } 1183884d179dSJan Kara 1184884d179dSJan Kara /* Print warning to user which exceeded quota */ 1185bf097aafSJan Kara static void print_warning(struct dquot_warn *warn) 1186884d179dSJan Kara { 1187884d179dSJan Kara char *msg = NULL; 1188884d179dSJan Kara struct tty_struct *tty; 1189bf097aafSJan Kara int warntype = warn->w_type; 1190884d179dSJan Kara 1191884d179dSJan Kara if (warntype == QUOTA_NL_IHARDBELOW || 1192884d179dSJan Kara warntype == QUOTA_NL_ISOFTBELOW || 1193884d179dSJan Kara warntype == QUOTA_NL_BHARDBELOW || 1194bf097aafSJan Kara warntype == QUOTA_NL_BSOFTBELOW || !need_print_warning(warn)) 1195884d179dSJan Kara return; 1196884d179dSJan Kara 1197884d179dSJan Kara tty = get_current_tty(); 1198884d179dSJan Kara if (!tty) 1199884d179dSJan Kara return; 1200bf097aafSJan Kara tty_write_message(tty, warn->w_sb->s_id); 1201884d179dSJan Kara if (warntype == QUOTA_NL_ISOFTWARN || warntype == QUOTA_NL_BSOFTWARN) 1202884d179dSJan Kara tty_write_message(tty, ": warning, "); 1203884d179dSJan Kara else 1204884d179dSJan Kara tty_write_message(tty, ": write failed, "); 12057b9c7321SEric W. Biederman tty_write_message(tty, quotatypes[warn->w_dq_id.type]); 1206884d179dSJan Kara switch (warntype) { 1207884d179dSJan Kara case QUOTA_NL_IHARDWARN: 1208884d179dSJan Kara msg = " file limit reached.\r\n"; 1209884d179dSJan Kara break; 1210884d179dSJan Kara case QUOTA_NL_ISOFTLONGWARN: 1211884d179dSJan Kara msg = " file quota exceeded too long.\r\n"; 1212884d179dSJan Kara break; 1213884d179dSJan Kara case QUOTA_NL_ISOFTWARN: 1214884d179dSJan Kara msg = " file quota exceeded.\r\n"; 1215884d179dSJan Kara break; 1216884d179dSJan Kara case QUOTA_NL_BHARDWARN: 1217884d179dSJan Kara msg = " block limit reached.\r\n"; 1218884d179dSJan Kara break; 1219884d179dSJan Kara case QUOTA_NL_BSOFTLONGWARN: 1220884d179dSJan Kara msg = " block quota exceeded too long.\r\n"; 1221884d179dSJan Kara break; 1222884d179dSJan Kara case QUOTA_NL_BSOFTWARN: 1223884d179dSJan Kara msg = " block quota exceeded.\r\n"; 1224884d179dSJan Kara break; 1225884d179dSJan Kara } 1226884d179dSJan Kara tty_write_message(tty, msg); 1227884d179dSJan Kara tty_kref_put(tty); 1228884d179dSJan Kara } 1229884d179dSJan Kara #endif 1230884d179dSJan Kara 1231bf097aafSJan Kara static void prepare_warning(struct dquot_warn *warn, struct dquot *dquot, 1232bf097aafSJan Kara int warntype) 1233bf097aafSJan Kara { 1234bf097aafSJan Kara if (warning_issued(dquot, warntype)) 1235bf097aafSJan Kara return; 1236bf097aafSJan Kara warn->w_type = warntype; 1237bf097aafSJan Kara warn->w_sb = dquot->dq_sb; 1238bf097aafSJan Kara warn->w_dq_id = dquot->dq_id; 1239bf097aafSJan Kara } 1240bf097aafSJan Kara 1241884d179dSJan Kara /* 1242884d179dSJan Kara * Write warnings to the console and send warning messages over netlink. 1243884d179dSJan Kara * 1244bf097aafSJan Kara * Note that this function can call into tty and networking code. 1245884d179dSJan Kara */ 1246bf097aafSJan Kara static void flush_warnings(struct dquot_warn *warn) 1247884d179dSJan Kara { 1248884d179dSJan Kara int i; 1249884d179dSJan Kara 125086e931a3SSteven Whitehouse for (i = 0; i < MAXQUOTAS; i++) { 1251bf097aafSJan Kara if (warn[i].w_type == QUOTA_NL_NOWARN) 1252bf097aafSJan Kara continue; 1253884d179dSJan Kara #ifdef CONFIG_PRINT_QUOTA_WARNING 1254bf097aafSJan Kara print_warning(&warn[i]); 1255884d179dSJan Kara #endif 12567b9c7321SEric W. Biederman quota_send_warning(warn[i].w_dq_id, 1257bf097aafSJan Kara warn[i].w_sb->s_dev, warn[i].w_type); 1258884d179dSJan Kara } 1259884d179dSJan Kara } 1260884d179dSJan Kara 12617a2435d8SJan Kara static int ignore_hardlimit(struct dquot *dquot) 1262884d179dSJan Kara { 12634c376dcaSEric W. Biederman struct mem_dqinfo *info = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_id.type]; 1264884d179dSJan Kara 1265884d179dSJan Kara return capable(CAP_SYS_RESOURCE) && 1266268157baSJan Kara (info->dqi_format->qf_fmt_id != QFMT_VFS_OLD || 12679c45101eSJan Kara !(info->dqi_flags & DQF_ROOT_SQUASH)); 1268884d179dSJan Kara } 1269884d179dSJan Kara 1270884d179dSJan Kara /* needs dq_data_lock */ 1271bf097aafSJan Kara static int check_idq(struct dquot *dquot, qsize_t inodes, 1272bf097aafSJan Kara struct dquot_warn *warn) 1273884d179dSJan Kara { 1274268157baSJan Kara qsize_t newinodes = dquot->dq_dqb.dqb_curinodes + inodes; 1275268157baSJan Kara 12764c376dcaSEric W. Biederman if (!sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_id.type) || 1277884d179dSJan Kara test_bit(DQ_FAKE_B, &dquot->dq_flags)) 1278efd8f0e6SChristoph Hellwig return 0; 1279884d179dSJan Kara 1280884d179dSJan Kara if (dquot->dq_dqb.dqb_ihardlimit && 1281268157baSJan Kara newinodes > dquot->dq_dqb.dqb_ihardlimit && 1282884d179dSJan Kara !ignore_hardlimit(dquot)) { 1283bf097aafSJan Kara prepare_warning(warn, dquot, QUOTA_NL_IHARDWARN); 1284efd8f0e6SChristoph Hellwig return -EDQUOT; 1285884d179dSJan Kara } 1286884d179dSJan Kara 1287884d179dSJan Kara if (dquot->dq_dqb.dqb_isoftlimit && 1288268157baSJan Kara newinodes > dquot->dq_dqb.dqb_isoftlimit && 1289268157baSJan Kara dquot->dq_dqb.dqb_itime && 1290e008bb61SArnd Bergmann ktime_get_real_seconds() >= dquot->dq_dqb.dqb_itime && 1291884d179dSJan Kara !ignore_hardlimit(dquot)) { 1292bf097aafSJan Kara prepare_warning(warn, dquot, QUOTA_NL_ISOFTLONGWARN); 1293efd8f0e6SChristoph Hellwig return -EDQUOT; 1294884d179dSJan Kara } 1295884d179dSJan Kara 1296884d179dSJan Kara if (dquot->dq_dqb.dqb_isoftlimit && 1297268157baSJan Kara newinodes > dquot->dq_dqb.dqb_isoftlimit && 1298884d179dSJan Kara dquot->dq_dqb.dqb_itime == 0) { 1299bf097aafSJan Kara prepare_warning(warn, dquot, QUOTA_NL_ISOFTWARN); 1300e008bb61SArnd Bergmann dquot->dq_dqb.dqb_itime = ktime_get_real_seconds() + 13014c376dcaSEric W. Biederman sb_dqopt(dquot->dq_sb)->info[dquot->dq_id.type].dqi_igrace; 1302884d179dSJan Kara } 1303884d179dSJan Kara 1304efd8f0e6SChristoph Hellwig return 0; 1305884d179dSJan Kara } 1306884d179dSJan Kara 1307884d179dSJan Kara /* needs dq_data_lock */ 1308bf097aafSJan Kara static int check_bdq(struct dquot *dquot, qsize_t space, int prealloc, 1309bf097aafSJan Kara struct dquot_warn *warn) 1310884d179dSJan Kara { 1311884d179dSJan Kara qsize_t tspace; 1312268157baSJan Kara struct super_block *sb = dquot->dq_sb; 1313884d179dSJan Kara 13144c376dcaSEric W. Biederman if (!sb_has_quota_limits_enabled(sb, dquot->dq_id.type) || 1315884d179dSJan Kara test_bit(DQ_FAKE_B, &dquot->dq_flags)) 1316efd8f0e6SChristoph Hellwig return 0; 1317884d179dSJan Kara 1318884d179dSJan Kara tspace = dquot->dq_dqb.dqb_curspace + dquot->dq_dqb.dqb_rsvspace 1319884d179dSJan Kara + space; 1320884d179dSJan Kara 1321884d179dSJan Kara if (dquot->dq_dqb.dqb_bhardlimit && 1322884d179dSJan Kara tspace > dquot->dq_dqb.dqb_bhardlimit && 1323884d179dSJan Kara !ignore_hardlimit(dquot)) { 1324884d179dSJan Kara if (!prealloc) 1325bf097aafSJan Kara prepare_warning(warn, dquot, QUOTA_NL_BHARDWARN); 1326efd8f0e6SChristoph Hellwig return -EDQUOT; 1327884d179dSJan Kara } 1328884d179dSJan Kara 1329884d179dSJan Kara if (dquot->dq_dqb.dqb_bsoftlimit && 1330884d179dSJan Kara tspace > dquot->dq_dqb.dqb_bsoftlimit && 1331268157baSJan Kara dquot->dq_dqb.dqb_btime && 1332e008bb61SArnd Bergmann ktime_get_real_seconds() >= dquot->dq_dqb.dqb_btime && 1333884d179dSJan Kara !ignore_hardlimit(dquot)) { 1334884d179dSJan Kara if (!prealloc) 1335bf097aafSJan Kara prepare_warning(warn, dquot, QUOTA_NL_BSOFTLONGWARN); 1336efd8f0e6SChristoph Hellwig return -EDQUOT; 1337884d179dSJan Kara } 1338884d179dSJan Kara 1339884d179dSJan Kara if (dquot->dq_dqb.dqb_bsoftlimit && 1340884d179dSJan Kara tspace > dquot->dq_dqb.dqb_bsoftlimit && 1341884d179dSJan Kara dquot->dq_dqb.dqb_btime == 0) { 1342884d179dSJan Kara if (!prealloc) { 1343bf097aafSJan Kara prepare_warning(warn, dquot, QUOTA_NL_BSOFTWARN); 1344e008bb61SArnd Bergmann dquot->dq_dqb.dqb_btime = ktime_get_real_seconds() + 13454c376dcaSEric W. Biederman sb_dqopt(sb)->info[dquot->dq_id.type].dqi_bgrace; 1346884d179dSJan Kara } 1347884d179dSJan Kara else 1348884d179dSJan Kara /* 1349884d179dSJan Kara * We don't allow preallocation to exceed softlimit so exceeding will 1350884d179dSJan Kara * be always printed 1351884d179dSJan Kara */ 1352efd8f0e6SChristoph Hellwig return -EDQUOT; 1353884d179dSJan Kara } 1354884d179dSJan Kara 1355efd8f0e6SChristoph Hellwig return 0; 1356884d179dSJan Kara } 1357884d179dSJan Kara 1358884d179dSJan Kara static int info_idq_free(struct dquot *dquot, qsize_t inodes) 1359884d179dSJan Kara { 1360268157baSJan Kara qsize_t newinodes; 1361268157baSJan Kara 1362884d179dSJan Kara if (test_bit(DQ_FAKE_B, &dquot->dq_flags) || 1363884d179dSJan Kara dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit || 13644c376dcaSEric W. Biederman !sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_id.type)) 1365884d179dSJan Kara return QUOTA_NL_NOWARN; 1366884d179dSJan Kara 1367268157baSJan Kara newinodes = dquot->dq_dqb.dqb_curinodes - inodes; 1368268157baSJan Kara if (newinodes <= dquot->dq_dqb.dqb_isoftlimit) 1369884d179dSJan Kara return QUOTA_NL_ISOFTBELOW; 1370884d179dSJan Kara if (dquot->dq_dqb.dqb_curinodes >= dquot->dq_dqb.dqb_ihardlimit && 1371268157baSJan Kara newinodes < dquot->dq_dqb.dqb_ihardlimit) 1372884d179dSJan Kara return QUOTA_NL_IHARDBELOW; 1373884d179dSJan Kara return QUOTA_NL_NOWARN; 1374884d179dSJan Kara } 1375884d179dSJan Kara 1376884d179dSJan Kara static int info_bdq_free(struct dquot *dquot, qsize_t space) 1377884d179dSJan Kara { 1378884d179dSJan Kara if (test_bit(DQ_FAKE_B, &dquot->dq_flags) || 1379884d179dSJan Kara dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit) 1380884d179dSJan Kara return QUOTA_NL_NOWARN; 1381884d179dSJan Kara 1382884d179dSJan Kara if (dquot->dq_dqb.dqb_curspace - space <= dquot->dq_dqb.dqb_bsoftlimit) 1383884d179dSJan Kara return QUOTA_NL_BSOFTBELOW; 1384884d179dSJan Kara if (dquot->dq_dqb.dqb_curspace >= dquot->dq_dqb.dqb_bhardlimit && 1385884d179dSJan Kara dquot->dq_dqb.dqb_curspace - space < dquot->dq_dqb.dqb_bhardlimit) 1386884d179dSJan Kara return QUOTA_NL_BHARDBELOW; 1387884d179dSJan Kara return QUOTA_NL_NOWARN; 1388884d179dSJan Kara } 13890a5a9c72SJan Kara 1390189eef59SChristoph Hellwig static int dquot_active(const struct inode *inode) 1391189eef59SChristoph Hellwig { 1392189eef59SChristoph Hellwig struct super_block *sb = inode->i_sb; 1393189eef59SChristoph Hellwig 1394189eef59SChristoph Hellwig if (IS_NOQUOTA(inode)) 1395189eef59SChristoph Hellwig return 0; 1396189eef59SChristoph Hellwig return sb_any_quota_loaded(sb) & ~sb_any_quota_suspended(sb); 1397189eef59SChristoph Hellwig } 1398189eef59SChristoph Hellwig 1399884d179dSJan Kara /* 1400884d179dSJan Kara * Initialize quota pointers in inode 1401871a2931SChristoph Hellwig * 1402871a2931SChristoph Hellwig * It is better to call this function outside of any transaction as it 1403871a2931SChristoph Hellwig * might need a lot of space in journal for dquot structure allocation. 1404884d179dSJan Kara */ 14056184fc0bSJan Kara static int __dquot_initialize(struct inode *inode, int type) 1406884d179dSJan Kara { 14071ea06becSNiu Yawei int cnt, init_needed = 0; 1408ab73ef46SNikolay Borisov struct dquot **dquots, *got[MAXQUOTAS] = {}; 1409884d179dSJan Kara struct super_block *sb = inode->i_sb; 14100a5a9c72SJan Kara qsize_t rsv; 14116184fc0bSJan Kara int ret = 0; 1412884d179dSJan Kara 1413189eef59SChristoph Hellwig if (!dquot_active(inode)) 14146184fc0bSJan Kara return 0; 1415884d179dSJan Kara 14165bcd3b6fSKonstantin Khlebnikov dquots = i_dquot(inode); 14175bcd3b6fSKonstantin Khlebnikov 1418884d179dSJan Kara /* First get references to structures we might need. */ 1419884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1420aca645a6SEric W. Biederman struct kqid qid; 1421847aac64SLi Xi kprojid_t projid; 1422847aac64SLi Xi int rc; 14236184fc0bSJan Kara struct dquot *dquot; 1424847aac64SLi Xi 1425884d179dSJan Kara if (type != -1 && cnt != type) 1426884d179dSJan Kara continue; 14271ea06becSNiu Yawei /* 14281ea06becSNiu Yawei * The i_dquot should have been initialized in most cases, 14291ea06becSNiu Yawei * we check it without locking here to avoid unnecessary 14301ea06becSNiu Yawei * dqget()/dqput() calls. 14311ea06becSNiu Yawei */ 14325bcd3b6fSKonstantin Khlebnikov if (dquots[cnt]) 14331ea06becSNiu Yawei continue; 1434847aac64SLi Xi 1435847aac64SLi Xi if (!sb_has_quota_active(sb, cnt)) 1436847aac64SLi Xi continue; 1437847aac64SLi Xi 14381ea06becSNiu Yawei init_needed = 1; 14391ea06becSNiu Yawei 1440884d179dSJan Kara switch (cnt) { 1441884d179dSJan Kara case USRQUOTA: 1442aca645a6SEric W. Biederman qid = make_kqid_uid(inode->i_uid); 1443884d179dSJan Kara break; 1444884d179dSJan Kara case GRPQUOTA: 1445aca645a6SEric W. Biederman qid = make_kqid_gid(inode->i_gid); 1446884d179dSJan Kara break; 1447847aac64SLi Xi case PRJQUOTA: 1448847aac64SLi Xi rc = inode->i_sb->dq_op->get_projid(inode, &projid); 1449847aac64SLi Xi if (rc) 1450847aac64SLi Xi continue; 1451847aac64SLi Xi qid = make_kqid_projid(projid); 1452847aac64SLi Xi break; 1453884d179dSJan Kara } 14546184fc0bSJan Kara dquot = dqget(sb, qid); 14556184fc0bSJan Kara if (IS_ERR(dquot)) { 14566184fc0bSJan Kara /* We raced with somebody turning quotas off... */ 14576184fc0bSJan Kara if (PTR_ERR(dquot) != -ESRCH) { 14586184fc0bSJan Kara ret = PTR_ERR(dquot); 14596184fc0bSJan Kara goto out_put; 14606184fc0bSJan Kara } 14616184fc0bSJan Kara dquot = NULL; 14626184fc0bSJan Kara } 14636184fc0bSJan Kara got[cnt] = dquot; 1464884d179dSJan Kara } 1465884d179dSJan Kara 14661ea06becSNiu Yawei /* All required i_dquot has been initialized */ 14671ea06becSNiu Yawei if (!init_needed) 14686184fc0bSJan Kara return 0; 14691ea06becSNiu Yawei 1470b9ba6f94SNiu Yawei spin_lock(&dq_data_lock); 1471884d179dSJan Kara if (IS_NOQUOTA(inode)) 14726184fc0bSJan Kara goto out_lock; 1473884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1474884d179dSJan Kara if (type != -1 && cnt != type) 1475884d179dSJan Kara continue; 1476884d179dSJan Kara /* Avoid races with quotaoff() */ 1477884d179dSJan Kara if (!sb_has_quota_active(sb, cnt)) 1478884d179dSJan Kara continue; 14794408ea41SJan Kara /* We could race with quotaon or dqget() could have failed */ 14804408ea41SJan Kara if (!got[cnt]) 14814408ea41SJan Kara continue; 14825bcd3b6fSKonstantin Khlebnikov if (!dquots[cnt]) { 14835bcd3b6fSKonstantin Khlebnikov dquots[cnt] = got[cnt]; 1484dd6f3c6dSJan Kara got[cnt] = NULL; 14850a5a9c72SJan Kara /* 14860a5a9c72SJan Kara * Make quota reservation system happy if someone 14870a5a9c72SJan Kara * did a write before quota was turned on 14880a5a9c72SJan Kara */ 14890a5a9c72SJan Kara rsv = inode_get_rsv_space(inode); 1490b9ba6f94SNiu Yawei if (unlikely(rsv)) 14915bcd3b6fSKonstantin Khlebnikov dquot_resv_space(dquots[cnt], rsv); 1492884d179dSJan Kara } 1493884d179dSJan Kara } 14946184fc0bSJan Kara out_lock: 1495b9ba6f94SNiu Yawei spin_unlock(&dq_data_lock); 14966184fc0bSJan Kara out_put: 1497884d179dSJan Kara /* Drop unused references */ 1498dc52dd3aSDmitry Monakhov dqput_all(got); 14996184fc0bSJan Kara 15006184fc0bSJan Kara return ret; 1501871a2931SChristoph Hellwig } 1502871a2931SChristoph Hellwig 15036184fc0bSJan Kara int dquot_initialize(struct inode *inode) 1504871a2931SChristoph Hellwig { 15056184fc0bSJan Kara return __dquot_initialize(inode, -1); 1506884d179dSJan Kara } 1507884d179dSJan Kara EXPORT_SYMBOL(dquot_initialize); 1508884d179dSJan Kara 1509b8cb5a54STahsin Erdogan bool dquot_initialize_needed(struct inode *inode) 1510b8cb5a54STahsin Erdogan { 1511b8cb5a54STahsin Erdogan struct dquot **dquots; 1512b8cb5a54STahsin Erdogan int i; 1513b8cb5a54STahsin Erdogan 1514b8cb5a54STahsin Erdogan if (!dquot_active(inode)) 1515b8cb5a54STahsin Erdogan return false; 1516b8cb5a54STahsin Erdogan 1517b8cb5a54STahsin Erdogan dquots = i_dquot(inode); 1518b8cb5a54STahsin Erdogan for (i = 0; i < MAXQUOTAS; i++) 1519b8cb5a54STahsin Erdogan if (!dquots[i] && sb_has_quota_active(inode->i_sb, i)) 1520b8cb5a54STahsin Erdogan return true; 1521b8cb5a54STahsin Erdogan return false; 1522b8cb5a54STahsin Erdogan } 1523b8cb5a54STahsin Erdogan EXPORT_SYMBOL(dquot_initialize_needed); 1524b8cb5a54STahsin Erdogan 1525884d179dSJan Kara /* 1526b9ba6f94SNiu Yawei * Release all quotas referenced by inode. 1527b9ba6f94SNiu Yawei * 1528b9ba6f94SNiu Yawei * This function only be called on inode free or converting 1529b9ba6f94SNiu Yawei * a file to quota file, no other users for the i_dquot in 1530b9ba6f94SNiu Yawei * both cases, so we needn't call synchronize_srcu() after 1531b9ba6f94SNiu Yawei * clearing i_dquot. 1532884d179dSJan Kara */ 15339f754758SChristoph Hellwig static void __dquot_drop(struct inode *inode) 1534884d179dSJan Kara { 1535884d179dSJan Kara int cnt; 15365bcd3b6fSKonstantin Khlebnikov struct dquot **dquots = i_dquot(inode); 1537884d179dSJan Kara struct dquot *put[MAXQUOTAS]; 1538884d179dSJan Kara 1539b9ba6f94SNiu Yawei spin_lock(&dq_data_lock); 1540884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 15415bcd3b6fSKonstantin Khlebnikov put[cnt] = dquots[cnt]; 15425bcd3b6fSKonstantin Khlebnikov dquots[cnt] = NULL; 1543884d179dSJan Kara } 1544b9ba6f94SNiu Yawei spin_unlock(&dq_data_lock); 1545dc52dd3aSDmitry Monakhov dqput_all(put); 1546884d179dSJan Kara } 1547884d179dSJan Kara 15489f754758SChristoph Hellwig void dquot_drop(struct inode *inode) 1549884d179dSJan Kara { 15505bcd3b6fSKonstantin Khlebnikov struct dquot * const *dquots; 1551884d179dSJan Kara int cnt; 15529f754758SChristoph Hellwig 15539f754758SChristoph Hellwig if (IS_NOQUOTA(inode)) 15549f754758SChristoph Hellwig return; 15559f754758SChristoph Hellwig 15569f754758SChristoph Hellwig /* 15579f754758SChristoph Hellwig * Test before calling to rule out calls from proc and such 1558884d179dSJan Kara * where we are not allowed to block. Note that this is 1559884d179dSJan Kara * actually reliable test even without the lock - the caller 1560884d179dSJan Kara * must assure that nobody can come after the DQUOT_DROP and 15619f754758SChristoph Hellwig * add quota pointers back anyway. 15629f754758SChristoph Hellwig */ 15635bcd3b6fSKonstantin Khlebnikov dquots = i_dquot(inode); 15649f754758SChristoph Hellwig for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 15655bcd3b6fSKonstantin Khlebnikov if (dquots[cnt]) 1566884d179dSJan Kara break; 15679f754758SChristoph Hellwig } 15689f754758SChristoph Hellwig 1569884d179dSJan Kara if (cnt < MAXQUOTAS) 15709f754758SChristoph Hellwig __dquot_drop(inode); 1571884d179dSJan Kara } 15729f754758SChristoph Hellwig EXPORT_SYMBOL(dquot_drop); 1573884d179dSJan Kara 1574884d179dSJan Kara /* 1575fd8fbfc1SDmitry Monakhov * inode_reserved_space is managed internally by quota, and protected by 1576fd8fbfc1SDmitry Monakhov * i_lock similar to i_blocks+i_bytes. 1577fd8fbfc1SDmitry Monakhov */ 1578fd8fbfc1SDmitry Monakhov static qsize_t *inode_reserved_space(struct inode * inode) 1579fd8fbfc1SDmitry Monakhov { 1580fd8fbfc1SDmitry Monakhov /* Filesystem must explicitly define it's own method in order to use 1581fd8fbfc1SDmitry Monakhov * quota reservation interface */ 1582fd8fbfc1SDmitry Monakhov BUG_ON(!inode->i_sb->dq_op->get_reserved_space); 1583fd8fbfc1SDmitry Monakhov return inode->i_sb->dq_op->get_reserved_space(inode); 1584fd8fbfc1SDmitry Monakhov } 1585fd8fbfc1SDmitry Monakhov 1586fd8fbfc1SDmitry Monakhov static qsize_t inode_get_rsv_space(struct inode *inode) 1587fd8fbfc1SDmitry Monakhov { 1588fd8fbfc1SDmitry Monakhov qsize_t ret; 158905b5d898SJan Kara 159005b5d898SJan Kara if (!inode->i_sb->dq_op->get_reserved_space) 159105b5d898SJan Kara return 0; 1592fd8fbfc1SDmitry Monakhov spin_lock(&inode->i_lock); 1593fd8fbfc1SDmitry Monakhov ret = *inode_reserved_space(inode); 1594fd8fbfc1SDmitry Monakhov spin_unlock(&inode->i_lock); 1595fd8fbfc1SDmitry Monakhov return ret; 1596fd8fbfc1SDmitry Monakhov } 1597fd8fbfc1SDmitry Monakhov 1598fd8fbfc1SDmitry Monakhov /* 15995dd4056dSChristoph Hellwig * This functions updates i_blocks+i_bytes fields and quota information 16005dd4056dSChristoph Hellwig * (together with appropriate checks). 16015dd4056dSChristoph Hellwig * 16025dd4056dSChristoph Hellwig * NOTE: We absolutely rely on the fact that caller dirties the inode 16035dd4056dSChristoph Hellwig * (usually helpers in quotaops.h care about this) and holds a handle for 16045dd4056dSChristoph Hellwig * the current transaction so that dquot write and inode write go into the 16055dd4056dSChristoph Hellwig * same transaction. 1606884d179dSJan Kara */ 1607884d179dSJan Kara 1608884d179dSJan Kara /* 1609884d179dSJan Kara * This operation can block, but only after everything is updated 1610884d179dSJan Kara */ 161156246f9aSEric Sandeen int __dquot_alloc_space(struct inode *inode, qsize_t number, int flags) 1612884d179dSJan Kara { 1613b9ba6f94SNiu Yawei int cnt, ret = 0, index; 1614bf097aafSJan Kara struct dquot_warn warn[MAXQUOTAS]; 161556246f9aSEric Sandeen int reserve = flags & DQUOT_SPACE_RESERVE; 16165bcd3b6fSKonstantin Khlebnikov struct dquot **dquots; 1617884d179dSJan Kara 1618189eef59SChristoph Hellwig if (!dquot_active(inode)) { 1619*a478e522SJan Kara if (reserve) { 1620*a478e522SJan Kara spin_lock(&inode->i_lock); 1621*a478e522SJan Kara *inode_reserved_space(inode) += number; 1622*a478e522SJan Kara spin_unlock(&inode->i_lock); 1623*a478e522SJan Kara } else { 1624*a478e522SJan Kara inode_add_bytes(inode, number); 1625*a478e522SJan Kara } 1626fd8fbfc1SDmitry Monakhov goto out; 1627fd8fbfc1SDmitry Monakhov } 1628fd8fbfc1SDmitry Monakhov 1629884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 1630bf097aafSJan Kara warn[cnt].w_type = QUOTA_NL_NOWARN; 1631884d179dSJan Kara 16325bcd3b6fSKonstantin Khlebnikov dquots = i_dquot(inode); 1633b9ba6f94SNiu Yawei index = srcu_read_lock(&dquot_srcu); 1634884d179dSJan Kara spin_lock(&dq_data_lock); 1635884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1636bf097aafSJan Kara if (!dquots[cnt]) 1637884d179dSJan Kara continue; 1638bf097aafSJan Kara ret = check_bdq(dquots[cnt], number, 1639bf097aafSJan Kara !(flags & DQUOT_SPACE_WARN), &warn[cnt]); 1640bf097aafSJan Kara if (ret && !(flags & DQUOT_SPACE_NOFAIL)) { 1641fd8fbfc1SDmitry Monakhov spin_unlock(&dq_data_lock); 1642fd8fbfc1SDmitry Monakhov goto out_flush_warn; 1643884d179dSJan Kara } 1644884d179dSJan Kara } 1645884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1646bf097aafSJan Kara if (!dquots[cnt]) 1647884d179dSJan Kara continue; 1648884d179dSJan Kara if (reserve) 1649bf097aafSJan Kara dquot_resv_space(dquots[cnt], number); 1650884d179dSJan Kara else 1651bf097aafSJan Kara dquot_incr_space(dquots[cnt], number); 1652884d179dSJan Kara } 1653*a478e522SJan Kara if (reserve) { 1654*a478e522SJan Kara spin_lock(&inode->i_lock); 1655*a478e522SJan Kara *inode_reserved_space(inode) += number; 1656*a478e522SJan Kara spin_unlock(&inode->i_lock); 1657*a478e522SJan Kara } else { 1658*a478e522SJan Kara inode_add_bytes(inode, number); 1659*a478e522SJan Kara } 1660884d179dSJan Kara spin_unlock(&dq_data_lock); 1661fd8fbfc1SDmitry Monakhov 1662fd8fbfc1SDmitry Monakhov if (reserve) 1663fd8fbfc1SDmitry Monakhov goto out_flush_warn; 1664bf097aafSJan Kara mark_all_dquot_dirty(dquots); 1665fd8fbfc1SDmitry Monakhov out_flush_warn: 1666b9ba6f94SNiu Yawei srcu_read_unlock(&dquot_srcu, index); 1667bf097aafSJan Kara flush_warnings(warn); 1668fd8fbfc1SDmitry Monakhov out: 1669884d179dSJan Kara return ret; 1670884d179dSJan Kara } 16715dd4056dSChristoph Hellwig EXPORT_SYMBOL(__dquot_alloc_space); 1672884d179dSJan Kara 1673884d179dSJan Kara /* 1674884d179dSJan Kara * This operation can block, but only after everything is updated 1675884d179dSJan Kara */ 16766bab3596SJan Kara int dquot_alloc_inode(struct inode *inode) 1677884d179dSJan Kara { 1678b9ba6f94SNiu Yawei int cnt, ret = 0, index; 1679bf097aafSJan Kara struct dquot_warn warn[MAXQUOTAS]; 16805bcd3b6fSKonstantin Khlebnikov struct dquot * const *dquots; 1681884d179dSJan Kara 1682189eef59SChristoph Hellwig if (!dquot_active(inode)) 168363936ddaSChristoph Hellwig return 0; 1684884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 1685bf097aafSJan Kara warn[cnt].w_type = QUOTA_NL_NOWARN; 1686b9ba6f94SNiu Yawei 16875bcd3b6fSKonstantin Khlebnikov dquots = i_dquot(inode); 1688b9ba6f94SNiu Yawei index = srcu_read_lock(&dquot_srcu); 1689884d179dSJan Kara spin_lock(&dq_data_lock); 1690884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1691bf097aafSJan Kara if (!dquots[cnt]) 1692884d179dSJan Kara continue; 1693bf097aafSJan Kara ret = check_idq(dquots[cnt], 1, &warn[cnt]); 1694efd8f0e6SChristoph Hellwig if (ret) 1695884d179dSJan Kara goto warn_put_all; 1696884d179dSJan Kara } 1697884d179dSJan Kara 1698884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1699bf097aafSJan Kara if (!dquots[cnt]) 1700884d179dSJan Kara continue; 1701bf097aafSJan Kara dquot_incr_inodes(dquots[cnt], 1); 1702884d179dSJan Kara } 1703efd8f0e6SChristoph Hellwig 1704884d179dSJan Kara warn_put_all: 1705884d179dSJan Kara spin_unlock(&dq_data_lock); 170663936ddaSChristoph Hellwig if (ret == 0) 1707bf097aafSJan Kara mark_all_dquot_dirty(dquots); 1708b9ba6f94SNiu Yawei srcu_read_unlock(&dquot_srcu, index); 1709bf097aafSJan Kara flush_warnings(warn); 1710884d179dSJan Kara return ret; 1711884d179dSJan Kara } 1712884d179dSJan Kara EXPORT_SYMBOL(dquot_alloc_inode); 1713884d179dSJan Kara 17145dd4056dSChristoph Hellwig /* 17155dd4056dSChristoph Hellwig * Convert in-memory reserved quotas to real consumed quotas 17165dd4056dSChristoph Hellwig */ 17175dd4056dSChristoph Hellwig int dquot_claim_space_nodirty(struct inode *inode, qsize_t number) 1718884d179dSJan Kara { 17195bcd3b6fSKonstantin Khlebnikov struct dquot **dquots; 1720b9ba6f94SNiu Yawei int cnt, index; 1721884d179dSJan Kara 1722189eef59SChristoph Hellwig if (!dquot_active(inode)) { 17230ed60de3SJan Kara spin_lock(&inode->i_lock); 17240ed60de3SJan Kara *inode_reserved_space(inode) -= number; 17250ed60de3SJan Kara __inode_add_bytes(inode, number); 17260ed60de3SJan Kara spin_unlock(&inode->i_lock); 17275dd4056dSChristoph Hellwig return 0; 1728884d179dSJan Kara } 1729884d179dSJan Kara 17305bcd3b6fSKonstantin Khlebnikov dquots = i_dquot(inode); 1731b9ba6f94SNiu Yawei index = srcu_read_lock(&dquot_srcu); 1732884d179dSJan Kara spin_lock(&dq_data_lock); 1733884d179dSJan Kara /* Claim reserved quotas to allocated quotas */ 1734884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 17355bcd3b6fSKonstantin Khlebnikov if (dquots[cnt]) 17365bcd3b6fSKonstantin Khlebnikov dquot_claim_reserved_space(dquots[cnt], number); 1737884d179dSJan Kara } 1738884d179dSJan Kara /* Update inode bytes */ 17390ed60de3SJan Kara spin_lock(&inode->i_lock); 17400ed60de3SJan Kara *inode_reserved_space(inode) -= number; 17410ed60de3SJan Kara __inode_add_bytes(inode, number); 17420ed60de3SJan Kara spin_unlock(&inode->i_lock); 1743884d179dSJan Kara spin_unlock(&dq_data_lock); 17445bcd3b6fSKonstantin Khlebnikov mark_all_dquot_dirty(dquots); 1745b9ba6f94SNiu Yawei srcu_read_unlock(&dquot_srcu, index); 17465dd4056dSChristoph Hellwig return 0; 1747884d179dSJan Kara } 17485dd4056dSChristoph Hellwig EXPORT_SYMBOL(dquot_claim_space_nodirty); 1749884d179dSJan Kara 1750884d179dSJan Kara /* 17511c8924ebSJan Kara * Convert allocated space back to in-memory reserved quotas 17521c8924ebSJan Kara */ 17531c8924ebSJan Kara void dquot_reclaim_space_nodirty(struct inode *inode, qsize_t number) 17541c8924ebSJan Kara { 17555bcd3b6fSKonstantin Khlebnikov struct dquot **dquots; 1756b9ba6f94SNiu Yawei int cnt, index; 17571c8924ebSJan Kara 17581c8924ebSJan Kara if (!dquot_active(inode)) { 17590ed60de3SJan Kara spin_lock(&inode->i_lock); 17600ed60de3SJan Kara *inode_reserved_space(inode) += number; 17610ed60de3SJan Kara __inode_sub_bytes(inode, number); 17620ed60de3SJan Kara spin_unlock(&inode->i_lock); 17631c8924ebSJan Kara return; 17641c8924ebSJan Kara } 17651c8924ebSJan Kara 17665bcd3b6fSKonstantin Khlebnikov dquots = i_dquot(inode); 1767b9ba6f94SNiu Yawei index = srcu_read_lock(&dquot_srcu); 17681c8924ebSJan Kara spin_lock(&dq_data_lock); 17691c8924ebSJan Kara /* Claim reserved quotas to allocated quotas */ 17701c8924ebSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 17715bcd3b6fSKonstantin Khlebnikov if (dquots[cnt]) 17725bcd3b6fSKonstantin Khlebnikov dquot_reclaim_reserved_space(dquots[cnt], number); 17731c8924ebSJan Kara } 17741c8924ebSJan Kara /* Update inode bytes */ 17750ed60de3SJan Kara spin_lock(&inode->i_lock); 17760ed60de3SJan Kara *inode_reserved_space(inode) += number; 17770ed60de3SJan Kara __inode_sub_bytes(inode, number); 17780ed60de3SJan Kara spin_unlock(&inode->i_lock); 17791c8924ebSJan Kara spin_unlock(&dq_data_lock); 17805bcd3b6fSKonstantin Khlebnikov mark_all_dquot_dirty(dquots); 1781b9ba6f94SNiu Yawei srcu_read_unlock(&dquot_srcu, index); 17821c8924ebSJan Kara return; 17831c8924ebSJan Kara } 17841c8924ebSJan Kara EXPORT_SYMBOL(dquot_reclaim_space_nodirty); 17851c8924ebSJan Kara 17861c8924ebSJan Kara /* 1787884d179dSJan Kara * This operation can block, but only after everything is updated 1788884d179dSJan Kara */ 178956246f9aSEric Sandeen void __dquot_free_space(struct inode *inode, qsize_t number, int flags) 1790884d179dSJan Kara { 1791884d179dSJan Kara unsigned int cnt; 1792bf097aafSJan Kara struct dquot_warn warn[MAXQUOTAS]; 17935bcd3b6fSKonstantin Khlebnikov struct dquot **dquots; 1794b9ba6f94SNiu Yawei int reserve = flags & DQUOT_SPACE_RESERVE, index; 1795884d179dSJan Kara 1796189eef59SChristoph Hellwig if (!dquot_active(inode)) { 1797*a478e522SJan Kara if (reserve) { 1798*a478e522SJan Kara spin_lock(&inode->i_lock); 1799*a478e522SJan Kara *inode_reserved_space(inode) -= number; 1800*a478e522SJan Kara spin_unlock(&inode->i_lock); 1801*a478e522SJan Kara } else { 1802*a478e522SJan Kara inode_sub_bytes(inode, number); 1803*a478e522SJan Kara } 18045dd4056dSChristoph Hellwig return; 1805884d179dSJan Kara } 1806884d179dSJan Kara 18075bcd3b6fSKonstantin Khlebnikov dquots = i_dquot(inode); 1808b9ba6f94SNiu Yawei index = srcu_read_lock(&dquot_srcu); 1809884d179dSJan Kara spin_lock(&dq_data_lock); 1810884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1811bf097aafSJan Kara int wtype; 1812bf097aafSJan Kara 1813bf097aafSJan Kara warn[cnt].w_type = QUOTA_NL_NOWARN; 1814bf097aafSJan Kara if (!dquots[cnt]) 1815884d179dSJan Kara continue; 1816bf097aafSJan Kara wtype = info_bdq_free(dquots[cnt], number); 1817bf097aafSJan Kara if (wtype != QUOTA_NL_NOWARN) 1818bf097aafSJan Kara prepare_warning(&warn[cnt], dquots[cnt], wtype); 1819fd8fbfc1SDmitry Monakhov if (reserve) 1820bf097aafSJan Kara dquot_free_reserved_space(dquots[cnt], number); 1821fd8fbfc1SDmitry Monakhov else 1822bf097aafSJan Kara dquot_decr_space(dquots[cnt], number); 1823884d179dSJan Kara } 1824*a478e522SJan Kara if (reserve) { 1825*a478e522SJan Kara spin_lock(&inode->i_lock); 1826*a478e522SJan Kara *inode_reserved_space(inode) -= number; 1827*a478e522SJan Kara spin_unlock(&inode->i_lock); 1828*a478e522SJan Kara } else { 1829*a478e522SJan Kara inode_sub_bytes(inode, number); 1830*a478e522SJan Kara } 1831884d179dSJan Kara spin_unlock(&dq_data_lock); 1832fd8fbfc1SDmitry Monakhov 1833fd8fbfc1SDmitry Monakhov if (reserve) 1834fd8fbfc1SDmitry Monakhov goto out_unlock; 1835bf097aafSJan Kara mark_all_dquot_dirty(dquots); 1836fd8fbfc1SDmitry Monakhov out_unlock: 1837b9ba6f94SNiu Yawei srcu_read_unlock(&dquot_srcu, index); 1838bf097aafSJan Kara flush_warnings(warn); 1839884d179dSJan Kara } 18405dd4056dSChristoph Hellwig EXPORT_SYMBOL(__dquot_free_space); 1841fd8fbfc1SDmitry Monakhov 1842fd8fbfc1SDmitry Monakhov /* 1843884d179dSJan Kara * This operation can block, but only after everything is updated 1844884d179dSJan Kara */ 18456bab3596SJan Kara void dquot_free_inode(struct inode *inode) 1846884d179dSJan Kara { 1847884d179dSJan Kara unsigned int cnt; 1848bf097aafSJan Kara struct dquot_warn warn[MAXQUOTAS]; 18495bcd3b6fSKonstantin Khlebnikov struct dquot * const *dquots; 1850b9ba6f94SNiu Yawei int index; 1851884d179dSJan Kara 1852189eef59SChristoph Hellwig if (!dquot_active(inode)) 185363936ddaSChristoph Hellwig return; 1854884d179dSJan Kara 18555bcd3b6fSKonstantin Khlebnikov dquots = i_dquot(inode); 1856b9ba6f94SNiu Yawei index = srcu_read_lock(&dquot_srcu); 1857884d179dSJan Kara spin_lock(&dq_data_lock); 1858884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1859bf097aafSJan Kara int wtype; 1860bf097aafSJan Kara 1861bf097aafSJan Kara warn[cnt].w_type = QUOTA_NL_NOWARN; 1862bf097aafSJan Kara if (!dquots[cnt]) 1863884d179dSJan Kara continue; 1864bf097aafSJan Kara wtype = info_idq_free(dquots[cnt], 1); 1865bf097aafSJan Kara if (wtype != QUOTA_NL_NOWARN) 1866bf097aafSJan Kara prepare_warning(&warn[cnt], dquots[cnt], wtype); 1867bf097aafSJan Kara dquot_decr_inodes(dquots[cnt], 1); 1868884d179dSJan Kara } 1869884d179dSJan Kara spin_unlock(&dq_data_lock); 1870bf097aafSJan Kara mark_all_dquot_dirty(dquots); 1871b9ba6f94SNiu Yawei srcu_read_unlock(&dquot_srcu, index); 1872bf097aafSJan Kara flush_warnings(warn); 1873884d179dSJan Kara } 1874884d179dSJan Kara EXPORT_SYMBOL(dquot_free_inode); 1875884d179dSJan Kara 1876884d179dSJan Kara /* 1877884d179dSJan Kara * Transfer the number of inode and blocks from one diskquota to an other. 1878bc8e5f07SJan Kara * On success, dquot references in transfer_to are consumed and references 1879bc8e5f07SJan Kara * to original dquots that need to be released are placed there. On failure, 1880bc8e5f07SJan Kara * references are kept untouched. 1881884d179dSJan Kara * 1882884d179dSJan Kara * This operation can block, but only after everything is updated 1883884d179dSJan Kara * A transaction must be started when entering this function. 1884bc8e5f07SJan Kara * 1885b9ba6f94SNiu Yawei * We are holding reference on transfer_from & transfer_to, no need to 1886b9ba6f94SNiu Yawei * protect them by srcu_read_lock(). 1887884d179dSJan Kara */ 1888bc8e5f07SJan Kara int __dquot_transfer(struct inode *inode, struct dquot **transfer_to) 1889884d179dSJan Kara { 1890884d179dSJan Kara qsize_t space, cur_space; 1891884d179dSJan Kara qsize_t rsv_space = 0; 18927a9ca53aSTahsin Erdogan qsize_t inode_usage = 1; 1893bc8e5f07SJan Kara struct dquot *transfer_from[MAXQUOTAS] = {}; 1894efd8f0e6SChristoph Hellwig int cnt, ret = 0; 18959e32784bSDmitry char is_valid[MAXQUOTAS] = {}; 1896bf097aafSJan Kara struct dquot_warn warn_to[MAXQUOTAS]; 1897bf097aafSJan Kara struct dquot_warn warn_from_inodes[MAXQUOTAS]; 1898bf097aafSJan Kara struct dquot_warn warn_from_space[MAXQUOTAS]; 1899884d179dSJan Kara 1900884d179dSJan Kara if (IS_NOQUOTA(inode)) 1901efd8f0e6SChristoph Hellwig return 0; 19027a9ca53aSTahsin Erdogan 19037a9ca53aSTahsin Erdogan if (inode->i_sb->dq_op->get_inode_usage) { 19047a9ca53aSTahsin Erdogan ret = inode->i_sb->dq_op->get_inode_usage(inode, &inode_usage); 19057a9ca53aSTahsin Erdogan if (ret) 19067a9ca53aSTahsin Erdogan return ret; 19077a9ca53aSTahsin Erdogan } 19087a9ca53aSTahsin Erdogan 1909884d179dSJan Kara /* Initialize the arrays */ 1910bf097aafSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1911bf097aafSJan Kara warn_to[cnt].w_type = QUOTA_NL_NOWARN; 1912bf097aafSJan Kara warn_from_inodes[cnt].w_type = QUOTA_NL_NOWARN; 1913bf097aafSJan Kara warn_from_space[cnt].w_type = QUOTA_NL_NOWARN; 1914bf097aafSJan Kara } 1915b9ba6f94SNiu Yawei 1916b9ba6f94SNiu Yawei spin_lock(&dq_data_lock); 1917884d179dSJan Kara if (IS_NOQUOTA(inode)) { /* File without quota accounting? */ 1918b9ba6f94SNiu Yawei spin_unlock(&dq_data_lock); 1919bc8e5f07SJan Kara return 0; 1920884d179dSJan Kara } 1921884d179dSJan Kara cur_space = inode_get_bytes(inode); 1922fd8fbfc1SDmitry Monakhov rsv_space = inode_get_rsv_space(inode); 1923884d179dSJan Kara space = cur_space + rsv_space; 1924884d179dSJan Kara /* Build the transfer_from list and check the limits */ 1925884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 19269e32784bSDmitry /* 19279e32784bSDmitry * Skip changes for same uid or gid or for turned off quota-type. 19289e32784bSDmitry */ 1929dd6f3c6dSJan Kara if (!transfer_to[cnt]) 1930884d179dSJan Kara continue; 19319e32784bSDmitry /* Avoid races with quotaoff() */ 19329e32784bSDmitry if (!sb_has_quota_active(inode->i_sb, cnt)) 19339e32784bSDmitry continue; 19349e32784bSDmitry is_valid[cnt] = 1; 19352d0fa467SJan Kara transfer_from[cnt] = i_dquot(inode)[cnt]; 19367a9ca53aSTahsin Erdogan ret = check_idq(transfer_to[cnt], inode_usage, &warn_to[cnt]); 1937efd8f0e6SChristoph Hellwig if (ret) 1938efd8f0e6SChristoph Hellwig goto over_quota; 1939bf097aafSJan Kara ret = check_bdq(transfer_to[cnt], space, 0, &warn_to[cnt]); 1940efd8f0e6SChristoph Hellwig if (ret) 1941884d179dSJan Kara goto over_quota; 1942884d179dSJan Kara } 1943884d179dSJan Kara 1944884d179dSJan Kara /* 1945884d179dSJan Kara * Finally perform the needed transfer from transfer_from to transfer_to 1946884d179dSJan Kara */ 1947884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 19489e32784bSDmitry if (!is_valid[cnt]) 1949884d179dSJan Kara continue; 1950884d179dSJan Kara /* Due to IO error we might not have transfer_from[] structure */ 1951884d179dSJan Kara if (transfer_from[cnt]) { 1952bf097aafSJan Kara int wtype; 19537a9ca53aSTahsin Erdogan wtype = info_idq_free(transfer_from[cnt], inode_usage); 1954bf097aafSJan Kara if (wtype != QUOTA_NL_NOWARN) 1955bf097aafSJan Kara prepare_warning(&warn_from_inodes[cnt], 1956bf097aafSJan Kara transfer_from[cnt], wtype); 1957bf097aafSJan Kara wtype = info_bdq_free(transfer_from[cnt], space); 1958bf097aafSJan Kara if (wtype != QUOTA_NL_NOWARN) 1959bf097aafSJan Kara prepare_warning(&warn_from_space[cnt], 1960bf097aafSJan Kara transfer_from[cnt], wtype); 19617a9ca53aSTahsin Erdogan dquot_decr_inodes(transfer_from[cnt], inode_usage); 1962884d179dSJan Kara dquot_decr_space(transfer_from[cnt], cur_space); 1963884d179dSJan Kara dquot_free_reserved_space(transfer_from[cnt], 1964884d179dSJan Kara rsv_space); 1965884d179dSJan Kara } 1966884d179dSJan Kara 19677a9ca53aSTahsin Erdogan dquot_incr_inodes(transfer_to[cnt], inode_usage); 1968884d179dSJan Kara dquot_incr_space(transfer_to[cnt], cur_space); 1969884d179dSJan Kara dquot_resv_space(transfer_to[cnt], rsv_space); 1970884d179dSJan Kara 19712d0fa467SJan Kara i_dquot(inode)[cnt] = transfer_to[cnt]; 1972884d179dSJan Kara } 1973884d179dSJan Kara spin_unlock(&dq_data_lock); 1974884d179dSJan Kara 1975dc52dd3aSDmitry Monakhov mark_all_dquot_dirty(transfer_from); 1976dc52dd3aSDmitry Monakhov mark_all_dquot_dirty(transfer_to); 1977bf097aafSJan Kara flush_warnings(warn_to); 1978bf097aafSJan Kara flush_warnings(warn_from_inodes); 1979bf097aafSJan Kara flush_warnings(warn_from_space); 1980bc8e5f07SJan Kara /* Pass back references to put */ 1981dc52dd3aSDmitry Monakhov for (cnt = 0; cnt < MAXQUOTAS; cnt++) 19829e32784bSDmitry if (is_valid[cnt]) 1983bc8e5f07SJan Kara transfer_to[cnt] = transfer_from[cnt]; 198486f3cbecSJan Kara return 0; 1985884d179dSJan Kara over_quota: 1986884d179dSJan Kara spin_unlock(&dq_data_lock); 1987bf097aafSJan Kara flush_warnings(warn_to); 198886f3cbecSJan Kara return ret; 1989884d179dSJan Kara } 1990bc8e5f07SJan Kara EXPORT_SYMBOL(__dquot_transfer); 1991884d179dSJan Kara 19928ddd69d6SDmitry Monakhov /* Wrapper for transferring ownership of an inode for uid/gid only 19938ddd69d6SDmitry Monakhov * Called from FSXXX_setattr() 19948ddd69d6SDmitry Monakhov */ 1995b43fa828SChristoph Hellwig int dquot_transfer(struct inode *inode, struct iattr *iattr) 1996884d179dSJan Kara { 1997bc8e5f07SJan Kara struct dquot *transfer_to[MAXQUOTAS] = {}; 19986184fc0bSJan Kara struct dquot *dquot; 1999bc8e5f07SJan Kara struct super_block *sb = inode->i_sb; 2000bc8e5f07SJan Kara int ret; 20018ddd69d6SDmitry Monakhov 2002189eef59SChristoph Hellwig if (!dquot_active(inode)) 2003884d179dSJan Kara return 0; 2004bc8e5f07SJan Kara 20056184fc0bSJan Kara if (iattr->ia_valid & ATTR_UID && !uid_eq(iattr->ia_uid, inode->i_uid)){ 20066184fc0bSJan Kara dquot = dqget(sb, make_kqid_uid(iattr->ia_uid)); 20076184fc0bSJan Kara if (IS_ERR(dquot)) { 20086184fc0bSJan Kara if (PTR_ERR(dquot) != -ESRCH) { 20096184fc0bSJan Kara ret = PTR_ERR(dquot); 20106184fc0bSJan Kara goto out_put; 20116184fc0bSJan Kara } 20126184fc0bSJan Kara dquot = NULL; 20136184fc0bSJan Kara } 20146184fc0bSJan Kara transfer_to[USRQUOTA] = dquot; 20156184fc0bSJan Kara } 20166184fc0bSJan Kara if (iattr->ia_valid & ATTR_GID && !gid_eq(iattr->ia_gid, inode->i_gid)){ 20176184fc0bSJan Kara dquot = dqget(sb, make_kqid_gid(iattr->ia_gid)); 20186184fc0bSJan Kara if (IS_ERR(dquot)) { 20196184fc0bSJan Kara if (PTR_ERR(dquot) != -ESRCH) { 20206184fc0bSJan Kara ret = PTR_ERR(dquot); 20216184fc0bSJan Kara goto out_put; 20226184fc0bSJan Kara } 20236184fc0bSJan Kara dquot = NULL; 20246184fc0bSJan Kara } 20256184fc0bSJan Kara transfer_to[GRPQUOTA] = dquot; 20266184fc0bSJan Kara } 2027bc8e5f07SJan Kara ret = __dquot_transfer(inode, transfer_to); 20286184fc0bSJan Kara out_put: 2029bc8e5f07SJan Kara dqput_all(transfer_to); 2030bc8e5f07SJan Kara return ret; 2031884d179dSJan Kara } 2032b43fa828SChristoph Hellwig EXPORT_SYMBOL(dquot_transfer); 2033884d179dSJan Kara 2034884d179dSJan Kara /* 2035884d179dSJan Kara * Write info of quota file to disk 2036884d179dSJan Kara */ 2037884d179dSJan Kara int dquot_commit_info(struct super_block *sb, int type) 2038884d179dSJan Kara { 2039884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 2040884d179dSJan Kara 20419a8ae30eSJan Kara return dqopt->ops[type]->write_file_info(sb, type); 2042884d179dSJan Kara } 2043884d179dSJan Kara EXPORT_SYMBOL(dquot_commit_info); 2044884d179dSJan Kara 2045be6257b2SJan Kara int dquot_get_next_id(struct super_block *sb, struct kqid *qid) 2046be6257b2SJan Kara { 2047be6257b2SJan Kara struct quota_info *dqopt = sb_dqopt(sb); 2048be6257b2SJan Kara 20499d1ccbe7SJan Kara if (!sb_has_quota_active(sb, qid->type)) 20509d1ccbe7SJan Kara return -ESRCH; 20519d1ccbe7SJan Kara if (!dqopt->ops[qid->type]->get_next_id) 20529d1ccbe7SJan Kara return -ENOSYS; 2053f14618c6SJan Kara return dqopt->ops[qid->type]->get_next_id(sb, qid); 2054be6257b2SJan Kara } 2055be6257b2SJan Kara EXPORT_SYMBOL(dquot_get_next_id); 2056be6257b2SJan Kara 2057884d179dSJan Kara /* 2058884d179dSJan Kara * Definitions of diskquota operations. 2059884d179dSJan Kara */ 206061e225dcSAlexey Dobriyan const struct dquot_operations dquot_operations = { 2061884d179dSJan Kara .write_dquot = dquot_commit, 2062884d179dSJan Kara .acquire_dquot = dquot_acquire, 2063884d179dSJan Kara .release_dquot = dquot_release, 2064884d179dSJan Kara .mark_dirty = dquot_mark_dquot_dirty, 2065884d179dSJan Kara .write_info = dquot_commit_info, 2066884d179dSJan Kara .alloc_dquot = dquot_alloc, 2067884d179dSJan Kara .destroy_dquot = dquot_destroy, 2068be6257b2SJan Kara .get_next_id = dquot_get_next_id, 2069884d179dSJan Kara }; 2070123e9cafSChristoph Hellwig EXPORT_SYMBOL(dquot_operations); 2071884d179dSJan Kara 2072884d179dSJan Kara /* 2073907f4554SChristoph Hellwig * Generic helper for ->open on filesystems supporting disk quotas. 2074907f4554SChristoph Hellwig */ 2075907f4554SChristoph Hellwig int dquot_file_open(struct inode *inode, struct file *file) 2076907f4554SChristoph Hellwig { 2077907f4554SChristoph Hellwig int error; 2078907f4554SChristoph Hellwig 2079907f4554SChristoph Hellwig error = generic_file_open(inode, file); 2080907f4554SChristoph Hellwig if (!error && (file->f_mode & FMODE_WRITE)) 2081871a2931SChristoph Hellwig dquot_initialize(inode); 2082907f4554SChristoph Hellwig return error; 2083907f4554SChristoph Hellwig } 2084907f4554SChristoph Hellwig EXPORT_SYMBOL(dquot_file_open); 2085907f4554SChristoph Hellwig 2086907f4554SChristoph Hellwig /* 2087884d179dSJan Kara * Turn quota off on a device. type == -1 ==> quotaoff for all types (umount) 2088884d179dSJan Kara */ 20890f0dd62fSChristoph Hellwig int dquot_disable(struct super_block *sb, int type, unsigned int flags) 2090884d179dSJan Kara { 2091884d179dSJan Kara int cnt, ret = 0; 2092884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 2093884d179dSJan Kara struct inode *toputinode[MAXQUOTAS]; 2094884d179dSJan Kara 20957d6cd73dSJan Kara /* s_umount should be held in exclusive mode */ 20967d6cd73dSJan Kara if (WARN_ON_ONCE(down_read_trylock(&sb->s_umount))) 20977d6cd73dSJan Kara up_read(&sb->s_umount); 20987d6cd73dSJan Kara 2099884d179dSJan Kara /* Cannot turn off usage accounting without turning off limits, or 2100884d179dSJan Kara * suspend quotas and simultaneously turn quotas off. */ 2101884d179dSJan Kara if ((flags & DQUOT_USAGE_ENABLED && !(flags & DQUOT_LIMITS_ENABLED)) 2102884d179dSJan Kara || (flags & DQUOT_SUSPENDED && flags & (DQUOT_LIMITS_ENABLED | 2103884d179dSJan Kara DQUOT_USAGE_ENABLED))) 2104884d179dSJan Kara return -EINVAL; 2105884d179dSJan Kara 2106884d179dSJan Kara /* 2107884d179dSJan Kara * Skip everything if there's nothing to do. We have to do this because 2108884d179dSJan Kara * sometimes we are called when fill_super() failed and calling 2109884d179dSJan Kara * sync_fs() in such cases does no good. 2110884d179dSJan Kara */ 2111c3b00446SJan Kara if (!sb_any_quota_loaded(sb)) 2112884d179dSJan Kara return 0; 2113c3b00446SJan Kara 2114884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 2115884d179dSJan Kara toputinode[cnt] = NULL; 2116884d179dSJan Kara if (type != -1 && cnt != type) 2117884d179dSJan Kara continue; 2118884d179dSJan Kara if (!sb_has_quota_loaded(sb, cnt)) 2119884d179dSJan Kara continue; 2120884d179dSJan Kara 2121884d179dSJan Kara if (flags & DQUOT_SUSPENDED) { 2122884d179dSJan Kara spin_lock(&dq_state_lock); 2123884d179dSJan Kara dqopt->flags |= 2124884d179dSJan Kara dquot_state_flag(DQUOT_SUSPENDED, cnt); 2125884d179dSJan Kara spin_unlock(&dq_state_lock); 2126884d179dSJan Kara } else { 2127884d179dSJan Kara spin_lock(&dq_state_lock); 2128884d179dSJan Kara dqopt->flags &= ~dquot_state_flag(flags, cnt); 2129884d179dSJan Kara /* Turning off suspended quotas? */ 2130884d179dSJan Kara if (!sb_has_quota_loaded(sb, cnt) && 2131884d179dSJan Kara sb_has_quota_suspended(sb, cnt)) { 2132884d179dSJan Kara dqopt->flags &= ~dquot_state_flag( 2133884d179dSJan Kara DQUOT_SUSPENDED, cnt); 2134884d179dSJan Kara spin_unlock(&dq_state_lock); 2135884d179dSJan Kara iput(dqopt->files[cnt]); 2136884d179dSJan Kara dqopt->files[cnt] = NULL; 2137884d179dSJan Kara continue; 2138884d179dSJan Kara } 2139884d179dSJan Kara spin_unlock(&dq_state_lock); 2140884d179dSJan Kara } 2141884d179dSJan Kara 2142884d179dSJan Kara /* We still have to keep quota loaded? */ 2143884d179dSJan Kara if (sb_has_quota_loaded(sb, cnt) && !(flags & DQUOT_SUSPENDED)) 2144884d179dSJan Kara continue; 2145884d179dSJan Kara 2146884d179dSJan Kara /* Note: these are blocking operations */ 2147884d179dSJan Kara drop_dquot_ref(sb, cnt); 2148884d179dSJan Kara invalidate_dquots(sb, cnt); 2149884d179dSJan Kara /* 2150268157baSJan Kara * Now all dquots should be invalidated, all writes done so we 2151268157baSJan Kara * should be only users of the info. No locks needed. 2152884d179dSJan Kara */ 2153884d179dSJan Kara if (info_dirty(&dqopt->info[cnt])) 2154884d179dSJan Kara sb->dq_op->write_info(sb, cnt); 2155884d179dSJan Kara if (dqopt->ops[cnt]->free_file_info) 2156884d179dSJan Kara dqopt->ops[cnt]->free_file_info(sb, cnt); 2157884d179dSJan Kara put_quota_format(dqopt->info[cnt].dqi_format); 2158884d179dSJan Kara 2159884d179dSJan Kara toputinode[cnt] = dqopt->files[cnt]; 2160884d179dSJan Kara if (!sb_has_quota_loaded(sb, cnt)) 2161884d179dSJan Kara dqopt->files[cnt] = NULL; 2162884d179dSJan Kara dqopt->info[cnt].dqi_flags = 0; 2163884d179dSJan Kara dqopt->info[cnt].dqi_igrace = 0; 2164884d179dSJan Kara dqopt->info[cnt].dqi_bgrace = 0; 2165884d179dSJan Kara dqopt->ops[cnt] = NULL; 2166884d179dSJan Kara } 2167884d179dSJan Kara 2168884d179dSJan Kara /* Skip syncing and setting flags if quota files are hidden */ 2169884d179dSJan Kara if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) 2170884d179dSJan Kara goto put_inodes; 2171884d179dSJan Kara 2172884d179dSJan Kara /* Sync the superblock so that buffers with quota data are written to 2173884d179dSJan Kara * disk (and so userspace sees correct data afterwards). */ 2174884d179dSJan Kara if (sb->s_op->sync_fs) 2175884d179dSJan Kara sb->s_op->sync_fs(sb, 1); 2176884d179dSJan Kara sync_blockdev(sb->s_bdev); 2177884d179dSJan Kara /* Now the quota files are just ordinary files and we can set the 2178884d179dSJan Kara * inode flags back. Moreover we discard the pagecache so that 2179884d179dSJan Kara * userspace sees the writes we did bypassing the pagecache. We 2180884d179dSJan Kara * must also discard the blockdev buffers so that we see the 2181884d179dSJan Kara * changes done by userspace on the next quotaon() */ 2182884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 21832700e606SJan Kara /* This can happen when suspending quotas on remount-ro... */ 21842700e606SJan Kara if (toputinode[cnt] && !sb_has_quota_loaded(sb, cnt)) { 21855955102cSAl Viro inode_lock(toputinode[cnt]); 2186aad6cde9SJan Kara toputinode[cnt]->i_flags &= ~S_NOQUOTA; 2187c3b00446SJan Kara truncate_inode_pages(&toputinode[cnt]->i_data, 0); 21885955102cSAl Viro inode_unlock(toputinode[cnt]); 218943d2932dSJan Kara mark_inode_dirty_sync(toputinode[cnt]); 2190884d179dSJan Kara } 2191884d179dSJan Kara if (sb->s_bdev) 2192884d179dSJan Kara invalidate_bdev(sb->s_bdev); 2193884d179dSJan Kara put_inodes: 2194884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 2195884d179dSJan Kara if (toputinode[cnt]) { 2196884d179dSJan Kara /* On remount RO, we keep the inode pointer so that we 2197884d179dSJan Kara * can reenable quota on the subsequent remount RW. We 2198884d179dSJan Kara * have to check 'flags' variable and not use sb_has_ 2199884d179dSJan Kara * function because another quotaon / quotaoff could 2200884d179dSJan Kara * change global state before we got here. We refuse 2201884d179dSJan Kara * to suspend quotas when there is pending delete on 2202884d179dSJan Kara * the quota file... */ 2203884d179dSJan Kara if (!(flags & DQUOT_SUSPENDED)) 2204884d179dSJan Kara iput(toputinode[cnt]); 2205884d179dSJan Kara else if (!toputinode[cnt]->i_nlink) 2206884d179dSJan Kara ret = -EBUSY; 2207884d179dSJan Kara } 2208884d179dSJan Kara return ret; 2209884d179dSJan Kara } 22100f0dd62fSChristoph Hellwig EXPORT_SYMBOL(dquot_disable); 2211884d179dSJan Kara 2212287a8095SChristoph Hellwig int dquot_quota_off(struct super_block *sb, int type) 2213884d179dSJan Kara { 22140f0dd62fSChristoph Hellwig return dquot_disable(sb, type, 22150f0dd62fSChristoph Hellwig DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); 2216884d179dSJan Kara } 2217287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_quota_off); 22180f0dd62fSChristoph Hellwig 2219884d179dSJan Kara /* 2220884d179dSJan Kara * Turn quotas on on a device 2221884d179dSJan Kara */ 2222884d179dSJan Kara 2223884d179dSJan Kara /* 2224884d179dSJan Kara * Helper function to turn quotas on when we already have the inode of 2225884d179dSJan Kara * quota file and no quota information is loaded. 2226884d179dSJan Kara */ 2227884d179dSJan Kara static int vfs_load_quota_inode(struct inode *inode, int type, int format_id, 2228884d179dSJan Kara unsigned int flags) 2229884d179dSJan Kara { 2230884d179dSJan Kara struct quota_format_type *fmt = find_quota_format(format_id); 2231884d179dSJan Kara struct super_block *sb = inode->i_sb; 2232884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 2233884d179dSJan Kara int error; 2234884d179dSJan Kara 2235884d179dSJan Kara if (!fmt) 2236884d179dSJan Kara return -ESRCH; 2237884d179dSJan Kara if (!S_ISREG(inode->i_mode)) { 2238884d179dSJan Kara error = -EACCES; 2239884d179dSJan Kara goto out_fmt; 2240884d179dSJan Kara } 2241884d179dSJan Kara if (IS_RDONLY(inode)) { 2242884d179dSJan Kara error = -EROFS; 2243884d179dSJan Kara goto out_fmt; 2244884d179dSJan Kara } 2245847aac64SLi Xi if (!sb->s_op->quota_write || !sb->s_op->quota_read || 2246847aac64SLi Xi (type == PRJQUOTA && sb->dq_op->get_projid == NULL)) { 2247884d179dSJan Kara error = -EINVAL; 2248884d179dSJan Kara goto out_fmt; 2249884d179dSJan Kara } 22505c004828SEric W. Biederman /* Filesystems outside of init_user_ns not yet supported */ 22515c004828SEric W. Biederman if (sb->s_user_ns != &init_user_ns) { 22525c004828SEric W. Biederman error = -EINVAL; 22535c004828SEric W. Biederman goto out_fmt; 22545c004828SEric W. Biederman } 2255884d179dSJan Kara /* Usage always has to be set... */ 2256884d179dSJan Kara if (!(flags & DQUOT_USAGE_ENABLED)) { 2257884d179dSJan Kara error = -EINVAL; 2258884d179dSJan Kara goto out_fmt; 2259884d179dSJan Kara } 2260c3b00446SJan Kara if (sb_has_quota_loaded(sb, type)) { 2261c3b00446SJan Kara error = -EBUSY; 2262c3b00446SJan Kara goto out_fmt; 2263c3b00446SJan Kara } 2264884d179dSJan Kara 2265884d179dSJan Kara if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) { 2266ab94c39bSJan Kara /* As we bypass the pagecache we must now flush all the 2267ab94c39bSJan Kara * dirty data and invalidate caches so that kernel sees 2268ab94c39bSJan Kara * changes from userspace. It is not enough to just flush 2269ab94c39bSJan Kara * the quota file since if blocksize < pagesize, invalidation 2270ab94c39bSJan Kara * of the cache could fail because of other unrelated dirty 2271ab94c39bSJan Kara * data */ 2272ab94c39bSJan Kara sync_filesystem(sb); 2273884d179dSJan Kara invalidate_bdev(sb->s_bdev); 2274884d179dSJan Kara } 2275884d179dSJan Kara 2276884d179dSJan Kara if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) { 2277884d179dSJan Kara /* We don't want quota and atime on quota files (deadlocks 2278884d179dSJan Kara * possible) Also nobody should write to the file - we use 2279884d179dSJan Kara * special IO operations which ignore the immutable bit. */ 22805955102cSAl Viro inode_lock(inode); 2281aad6cde9SJan Kara inode->i_flags |= S_NOQUOTA; 22825955102cSAl Viro inode_unlock(inode); 228326245c94SJan Kara /* 228426245c94SJan Kara * When S_NOQUOTA is set, remove dquot references as no more 228526245c94SJan Kara * references can be added 228626245c94SJan Kara */ 22879f754758SChristoph Hellwig __dquot_drop(inode); 2288884d179dSJan Kara } 2289884d179dSJan Kara 2290884d179dSJan Kara error = -EIO; 2291884d179dSJan Kara dqopt->files[type] = igrab(inode); 2292884d179dSJan Kara if (!dqopt->files[type]) 2293c3b00446SJan Kara goto out_file_flags; 2294884d179dSJan Kara error = -EINVAL; 2295884d179dSJan Kara if (!fmt->qf_ops->check_quota_file(sb, type)) 2296884d179dSJan Kara goto out_file_init; 2297884d179dSJan Kara 2298884d179dSJan Kara dqopt->ops[type] = fmt->qf_ops; 2299884d179dSJan Kara dqopt->info[type].dqi_format = fmt; 2300884d179dSJan Kara dqopt->info[type].dqi_fmt_id = format_id; 2301884d179dSJan Kara INIT_LIST_HEAD(&dqopt->info[type].dqi_dirty_list); 2302268157baSJan Kara error = dqopt->ops[type]->read_file_info(sb, type); 230342fdb858SJan Kara if (error < 0) 2304884d179dSJan Kara goto out_file_init; 230515512377SJan Kara if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) { 230615512377SJan Kara spin_lock(&dq_data_lock); 230746fe44ceSJan Kara dqopt->info[type].dqi_flags |= DQF_SYS_FILE; 230815512377SJan Kara spin_unlock(&dq_data_lock); 230915512377SJan Kara } 2310884d179dSJan Kara spin_lock(&dq_state_lock); 2311884d179dSJan Kara dqopt->flags |= dquot_state_flag(flags, type); 2312884d179dSJan Kara spin_unlock(&dq_state_lock); 2313884d179dSJan Kara 2314884d179dSJan Kara add_dquot_ref(sb, type); 2315884d179dSJan Kara 2316884d179dSJan Kara return 0; 2317884d179dSJan Kara 2318884d179dSJan Kara out_file_init: 2319884d179dSJan Kara dqopt->files[type] = NULL; 2320884d179dSJan Kara iput(inode); 2321c3b00446SJan Kara out_file_flags: 23225955102cSAl Viro inode_lock(inode); 2323aad6cde9SJan Kara inode->i_flags &= ~S_NOQUOTA; 23245955102cSAl Viro inode_unlock(inode); 2325884d179dSJan Kara out_fmt: 2326884d179dSJan Kara put_quota_format(fmt); 2327884d179dSJan Kara 2328884d179dSJan Kara return error; 2329884d179dSJan Kara } 2330884d179dSJan Kara 2331884d179dSJan Kara /* Reenable quotas on remount RW */ 23320f0dd62fSChristoph Hellwig int dquot_resume(struct super_block *sb, int type) 2333884d179dSJan Kara { 2334884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 2335884d179dSJan Kara struct inode *inode; 23360f0dd62fSChristoph Hellwig int ret = 0, cnt; 2337884d179dSJan Kara unsigned int flags; 2338884d179dSJan Kara 23397d6cd73dSJan Kara /* s_umount should be held in exclusive mode */ 23407d6cd73dSJan Kara if (WARN_ON_ONCE(down_read_trylock(&sb->s_umount))) 23417d6cd73dSJan Kara up_read(&sb->s_umount); 23427d6cd73dSJan Kara 23430f0dd62fSChristoph Hellwig for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 23440f0dd62fSChristoph Hellwig if (type != -1 && cnt != type) 23450f0dd62fSChristoph Hellwig continue; 2346c3b00446SJan Kara if (!sb_has_quota_suspended(sb, cnt)) 23470f0dd62fSChristoph Hellwig continue; 2348c3b00446SJan Kara 23490f0dd62fSChristoph Hellwig inode = dqopt->files[cnt]; 23500f0dd62fSChristoph Hellwig dqopt->files[cnt] = NULL; 2351884d179dSJan Kara spin_lock(&dq_state_lock); 2352884d179dSJan Kara flags = dqopt->flags & dquot_state_flag(DQUOT_USAGE_ENABLED | 23530f0dd62fSChristoph Hellwig DQUOT_LIMITS_ENABLED, 23540f0dd62fSChristoph Hellwig cnt); 23550f0dd62fSChristoph Hellwig dqopt->flags &= ~dquot_state_flag(DQUOT_STATE_FLAGS, cnt); 2356884d179dSJan Kara spin_unlock(&dq_state_lock); 2357884d179dSJan Kara 23580f0dd62fSChristoph Hellwig flags = dquot_generic_flag(flags, cnt); 23590f0dd62fSChristoph Hellwig ret = vfs_load_quota_inode(inode, cnt, 23600f0dd62fSChristoph Hellwig dqopt->info[cnt].dqi_fmt_id, flags); 2361884d179dSJan Kara iput(inode); 23620f0dd62fSChristoph Hellwig } 2363884d179dSJan Kara 2364884d179dSJan Kara return ret; 2365884d179dSJan Kara } 23660f0dd62fSChristoph Hellwig EXPORT_SYMBOL(dquot_resume); 2367884d179dSJan Kara 2368f00c9e44SJan Kara int dquot_quota_on(struct super_block *sb, int type, int format_id, 23698c54ca9cSAl Viro const struct path *path) 2370884d179dSJan Kara { 2371884d179dSJan Kara int error = security_quota_on(path->dentry); 2372884d179dSJan Kara if (error) 2373884d179dSJan Kara return error; 2374884d179dSJan Kara /* Quota file not on the same filesystem? */ 2375d8c9584eSAl Viro if (path->dentry->d_sb != sb) 2376884d179dSJan Kara error = -EXDEV; 2377884d179dSJan Kara else 2378dea655c2SDavid Howells error = vfs_load_quota_inode(d_inode(path->dentry), type, 2379884d179dSJan Kara format_id, DQUOT_USAGE_ENABLED | 2380884d179dSJan Kara DQUOT_LIMITS_ENABLED); 2381884d179dSJan Kara return error; 2382884d179dSJan Kara } 2383287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_quota_on); 2384884d179dSJan Kara 2385884d179dSJan Kara /* 2386884d179dSJan Kara * More powerful function for turning on quotas allowing setting 2387884d179dSJan Kara * of individual quota flags 2388884d179dSJan Kara */ 2389287a8095SChristoph Hellwig int dquot_enable(struct inode *inode, int type, int format_id, 2390884d179dSJan Kara unsigned int flags) 2391884d179dSJan Kara { 2392884d179dSJan Kara struct super_block *sb = inode->i_sb; 2393884d179dSJan Kara 2394884d179dSJan Kara /* Just unsuspend quotas? */ 23950f0dd62fSChristoph Hellwig BUG_ON(flags & DQUOT_SUSPENDED); 23967d6cd73dSJan Kara /* s_umount should be held in exclusive mode */ 23977d6cd73dSJan Kara if (WARN_ON_ONCE(down_read_trylock(&sb->s_umount))) 23987d6cd73dSJan Kara up_read(&sb->s_umount); 23990f0dd62fSChristoph Hellwig 2400884d179dSJan Kara if (!flags) 2401884d179dSJan Kara return 0; 2402884d179dSJan Kara /* Just updating flags needed? */ 2403884d179dSJan Kara if (sb_has_quota_loaded(sb, type)) { 2404884d179dSJan Kara if (flags & DQUOT_USAGE_ENABLED && 2405c3b00446SJan Kara sb_has_quota_usage_enabled(sb, type)) 2406c3b00446SJan Kara return -EBUSY; 2407884d179dSJan Kara if (flags & DQUOT_LIMITS_ENABLED && 2408c3b00446SJan Kara sb_has_quota_limits_enabled(sb, type)) 2409c3b00446SJan Kara return -EBUSY; 2410884d179dSJan Kara spin_lock(&dq_state_lock); 2411884d179dSJan Kara sb_dqopt(sb)->flags |= dquot_state_flag(flags, type); 2412884d179dSJan Kara spin_unlock(&dq_state_lock); 2413c3b00446SJan Kara return 0; 2414884d179dSJan Kara } 2415884d179dSJan Kara 2416884d179dSJan Kara return vfs_load_quota_inode(inode, type, format_id, flags); 2417884d179dSJan Kara } 2418287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_enable); 2419884d179dSJan Kara 2420884d179dSJan Kara /* 2421884d179dSJan Kara * This function is used when filesystem needs to initialize quotas 2422884d179dSJan Kara * during mount time. 2423884d179dSJan Kara */ 2424287a8095SChristoph Hellwig int dquot_quota_on_mount(struct super_block *sb, char *qf_name, 2425884d179dSJan Kara int format_id, int type) 2426884d179dSJan Kara { 2427884d179dSJan Kara struct dentry *dentry; 2428884d179dSJan Kara int error; 2429884d179dSJan Kara 2430e12a4e8aSAl Viro dentry = lookup_one_len_unlocked(qf_name, sb->s_root, strlen(qf_name)); 2431884d179dSJan Kara if (IS_ERR(dentry)) 2432884d179dSJan Kara return PTR_ERR(dentry); 2433884d179dSJan Kara 2434dea655c2SDavid Howells if (d_really_is_negative(dentry)) { 2435884d179dSJan Kara error = -ENOENT; 2436884d179dSJan Kara goto out; 2437884d179dSJan Kara } 2438884d179dSJan Kara 2439884d179dSJan Kara error = security_quota_on(dentry); 2440884d179dSJan Kara if (!error) 2441dea655c2SDavid Howells error = vfs_load_quota_inode(d_inode(dentry), type, format_id, 2442884d179dSJan Kara DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); 2443884d179dSJan Kara 2444884d179dSJan Kara out: 2445884d179dSJan Kara dput(dentry); 2446884d179dSJan Kara return error; 2447884d179dSJan Kara } 2448287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_quota_on_mount); 2449884d179dSJan Kara 24503e2af67eSJan Kara static int dquot_quota_enable(struct super_block *sb, unsigned int flags) 24513e2af67eSJan Kara { 24523e2af67eSJan Kara int ret; 24533e2af67eSJan Kara int type; 24543e2af67eSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 24553e2af67eSJan Kara 24563e2af67eSJan Kara if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) 24573e2af67eSJan Kara return -ENOSYS; 24583e2af67eSJan Kara /* Accounting cannot be turned on while fs is mounted */ 24593e2af67eSJan Kara flags &= ~(FS_QUOTA_UDQ_ACCT | FS_QUOTA_GDQ_ACCT | FS_QUOTA_PDQ_ACCT); 24603e2af67eSJan Kara if (!flags) 24613e2af67eSJan Kara return -EINVAL; 24623e2af67eSJan Kara for (type = 0; type < MAXQUOTAS; type++) { 24633e2af67eSJan Kara if (!(flags & qtype_enforce_flag(type))) 24643e2af67eSJan Kara continue; 24653e2af67eSJan Kara /* Can't enforce without accounting */ 24663e2af67eSJan Kara if (!sb_has_quota_usage_enabled(sb, type)) 24673e2af67eSJan Kara return -EINVAL; 24683e2af67eSJan Kara ret = dquot_enable(dqopt->files[type], type, 24693e2af67eSJan Kara dqopt->info[type].dqi_fmt_id, 24703e2af67eSJan Kara DQUOT_LIMITS_ENABLED); 24713e2af67eSJan Kara if (ret < 0) 24723e2af67eSJan Kara goto out_err; 24733e2af67eSJan Kara } 24743e2af67eSJan Kara return 0; 24753e2af67eSJan Kara out_err: 24763e2af67eSJan Kara /* Backout enforcement enablement we already did */ 24773e2af67eSJan Kara for (type--; type >= 0; type--) { 24783e2af67eSJan Kara if (flags & qtype_enforce_flag(type)) 24793e2af67eSJan Kara dquot_disable(sb, type, DQUOT_LIMITS_ENABLED); 24803e2af67eSJan Kara } 24813e2af67eSJan Kara /* Error code translation for better compatibility with XFS */ 24823e2af67eSJan Kara if (ret == -EBUSY) 24833e2af67eSJan Kara ret = -EEXIST; 24843e2af67eSJan Kara return ret; 24853e2af67eSJan Kara } 24863e2af67eSJan Kara 24873e2af67eSJan Kara static int dquot_quota_disable(struct super_block *sb, unsigned int flags) 24883e2af67eSJan Kara { 24893e2af67eSJan Kara int ret; 24903e2af67eSJan Kara int type; 24913e2af67eSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 24923e2af67eSJan Kara 24933e2af67eSJan Kara if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) 24943e2af67eSJan Kara return -ENOSYS; 24953e2af67eSJan Kara /* 24963e2af67eSJan Kara * We don't support turning off accounting via quotactl. In principle 24973e2af67eSJan Kara * quota infrastructure can do this but filesystems don't expect 24983e2af67eSJan Kara * userspace to be able to do it. 24993e2af67eSJan Kara */ 25003e2af67eSJan Kara if (flags & 25013e2af67eSJan Kara (FS_QUOTA_UDQ_ACCT | FS_QUOTA_GDQ_ACCT | FS_QUOTA_PDQ_ACCT)) 25023e2af67eSJan Kara return -EOPNOTSUPP; 25033e2af67eSJan Kara 25043e2af67eSJan Kara /* Filter out limits not enabled */ 25053e2af67eSJan Kara for (type = 0; type < MAXQUOTAS; type++) 25063e2af67eSJan Kara if (!sb_has_quota_limits_enabled(sb, type)) 25073e2af67eSJan Kara flags &= ~qtype_enforce_flag(type); 25083e2af67eSJan Kara /* Nothing left? */ 25093e2af67eSJan Kara if (!flags) 25103e2af67eSJan Kara return -EEXIST; 25113e2af67eSJan Kara for (type = 0; type < MAXQUOTAS; type++) { 25123e2af67eSJan Kara if (flags & qtype_enforce_flag(type)) { 25133e2af67eSJan Kara ret = dquot_disable(sb, type, DQUOT_LIMITS_ENABLED); 25143e2af67eSJan Kara if (ret < 0) 25153e2af67eSJan Kara goto out_err; 25163e2af67eSJan Kara } 25173e2af67eSJan Kara } 25183e2af67eSJan Kara return 0; 25193e2af67eSJan Kara out_err: 25203e2af67eSJan Kara /* Backout enforcement disabling we already did */ 25213e2af67eSJan Kara for (type--; type >= 0; type--) { 25223e2af67eSJan Kara if (flags & qtype_enforce_flag(type)) 25233e2af67eSJan Kara dquot_enable(dqopt->files[type], type, 25243e2af67eSJan Kara dqopt->info[type].dqi_fmt_id, 25253e2af67eSJan Kara DQUOT_LIMITS_ENABLED); 25263e2af67eSJan Kara } 25273e2af67eSJan Kara return ret; 25283e2af67eSJan Kara } 25293e2af67eSJan Kara 2530884d179dSJan Kara /* Generic routine for getting common part of quota structure */ 253114bf61ffSJan Kara static void do_get_dqblk(struct dquot *dquot, struct qc_dqblk *di) 2532884d179dSJan Kara { 2533884d179dSJan Kara struct mem_dqblk *dm = &dquot->dq_dqb; 2534884d179dSJan Kara 2535b9b2dd36SChristoph Hellwig memset(di, 0, sizeof(*di)); 2536884d179dSJan Kara spin_lock(&dq_data_lock); 253714bf61ffSJan Kara di->d_spc_hardlimit = dm->dqb_bhardlimit; 253814bf61ffSJan Kara di->d_spc_softlimit = dm->dqb_bsoftlimit; 2539b9b2dd36SChristoph Hellwig di->d_ino_hardlimit = dm->dqb_ihardlimit; 2540b9b2dd36SChristoph Hellwig di->d_ino_softlimit = dm->dqb_isoftlimit; 254114bf61ffSJan Kara di->d_space = dm->dqb_curspace + dm->dqb_rsvspace; 254214bf61ffSJan Kara di->d_ino_count = dm->dqb_curinodes; 254314bf61ffSJan Kara di->d_spc_timer = dm->dqb_btime; 254414bf61ffSJan Kara di->d_ino_timer = dm->dqb_itime; 2545884d179dSJan Kara spin_unlock(&dq_data_lock); 2546884d179dSJan Kara } 2547884d179dSJan Kara 254874a8a103SEric W. Biederman int dquot_get_dqblk(struct super_block *sb, struct kqid qid, 254914bf61ffSJan Kara struct qc_dqblk *di) 2550884d179dSJan Kara { 2551884d179dSJan Kara struct dquot *dquot; 2552884d179dSJan Kara 2553aca645a6SEric W. Biederman dquot = dqget(sb, qid); 25546184fc0bSJan Kara if (IS_ERR(dquot)) 25556184fc0bSJan Kara return PTR_ERR(dquot); 2556884d179dSJan Kara do_get_dqblk(dquot, di); 2557884d179dSJan Kara dqput(dquot); 2558884d179dSJan Kara 2559884d179dSJan Kara return 0; 2560884d179dSJan Kara } 2561287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_get_dqblk); 2562884d179dSJan Kara 2563be6257b2SJan Kara int dquot_get_next_dqblk(struct super_block *sb, struct kqid *qid, 2564be6257b2SJan Kara struct qc_dqblk *di) 2565be6257b2SJan Kara { 2566be6257b2SJan Kara struct dquot *dquot; 2567be6257b2SJan Kara int err; 2568be6257b2SJan Kara 2569be6257b2SJan Kara if (!sb->dq_op->get_next_id) 2570be6257b2SJan Kara return -ENOSYS; 2571be6257b2SJan Kara err = sb->dq_op->get_next_id(sb, qid); 2572be6257b2SJan Kara if (err < 0) 2573be6257b2SJan Kara return err; 2574be6257b2SJan Kara dquot = dqget(sb, *qid); 2575be6257b2SJan Kara if (IS_ERR(dquot)) 2576be6257b2SJan Kara return PTR_ERR(dquot); 2577be6257b2SJan Kara do_get_dqblk(dquot, di); 2578be6257b2SJan Kara dqput(dquot); 2579be6257b2SJan Kara 2580be6257b2SJan Kara return 0; 2581be6257b2SJan Kara } 2582be6257b2SJan Kara EXPORT_SYMBOL(dquot_get_next_dqblk); 2583be6257b2SJan Kara 258414bf61ffSJan Kara #define VFS_QC_MASK \ 258514bf61ffSJan Kara (QC_SPACE | QC_SPC_SOFT | QC_SPC_HARD | \ 258614bf61ffSJan Kara QC_INO_COUNT | QC_INO_SOFT | QC_INO_HARD | \ 258714bf61ffSJan Kara QC_SPC_TIMER | QC_INO_TIMER) 2588c472b432SChristoph Hellwig 2589884d179dSJan Kara /* Generic routine for setting common part of quota structure */ 259014bf61ffSJan Kara static int do_set_dqblk(struct dquot *dquot, struct qc_dqblk *di) 2591884d179dSJan Kara { 2592884d179dSJan Kara struct mem_dqblk *dm = &dquot->dq_dqb; 2593884d179dSJan Kara int check_blim = 0, check_ilim = 0; 25944c376dcaSEric W. Biederman struct mem_dqinfo *dqi = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_id.type]; 2595884d179dSJan Kara 259614bf61ffSJan Kara if (di->d_fieldmask & ~VFS_QC_MASK) 2597c472b432SChristoph Hellwig return -EINVAL; 2598c472b432SChristoph Hellwig 259914bf61ffSJan Kara if (((di->d_fieldmask & QC_SPC_SOFT) && 2600b10a0819SJan Kara di->d_spc_softlimit > dqi->dqi_max_spc_limit) || 260114bf61ffSJan Kara ((di->d_fieldmask & QC_SPC_HARD) && 2602b10a0819SJan Kara di->d_spc_hardlimit > dqi->dqi_max_spc_limit) || 260314bf61ffSJan Kara ((di->d_fieldmask & QC_INO_SOFT) && 2604b10a0819SJan Kara (di->d_ino_softlimit > dqi->dqi_max_ino_limit)) || 260514bf61ffSJan Kara ((di->d_fieldmask & QC_INO_HARD) && 2606b10a0819SJan Kara (di->d_ino_hardlimit > dqi->dqi_max_ino_limit))) 2607884d179dSJan Kara return -ERANGE; 2608884d179dSJan Kara 2609884d179dSJan Kara spin_lock(&dq_data_lock); 261014bf61ffSJan Kara if (di->d_fieldmask & QC_SPACE) { 261114bf61ffSJan Kara dm->dqb_curspace = di->d_space - dm->dqb_rsvspace; 2612884d179dSJan Kara check_blim = 1; 261308261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags); 2614884d179dSJan Kara } 2615c472b432SChristoph Hellwig 261614bf61ffSJan Kara if (di->d_fieldmask & QC_SPC_SOFT) 261714bf61ffSJan Kara dm->dqb_bsoftlimit = di->d_spc_softlimit; 261814bf61ffSJan Kara if (di->d_fieldmask & QC_SPC_HARD) 261914bf61ffSJan Kara dm->dqb_bhardlimit = di->d_spc_hardlimit; 262014bf61ffSJan Kara if (di->d_fieldmask & (QC_SPC_SOFT | QC_SPC_HARD)) { 2621884d179dSJan Kara check_blim = 1; 262208261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags); 2623884d179dSJan Kara } 2624c472b432SChristoph Hellwig 262514bf61ffSJan Kara if (di->d_fieldmask & QC_INO_COUNT) { 262614bf61ffSJan Kara dm->dqb_curinodes = di->d_ino_count; 2627884d179dSJan Kara check_ilim = 1; 262808261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags); 2629884d179dSJan Kara } 2630c472b432SChristoph Hellwig 263114bf61ffSJan Kara if (di->d_fieldmask & QC_INO_SOFT) 2632c472b432SChristoph Hellwig dm->dqb_isoftlimit = di->d_ino_softlimit; 263314bf61ffSJan Kara if (di->d_fieldmask & QC_INO_HARD) 2634c472b432SChristoph Hellwig dm->dqb_ihardlimit = di->d_ino_hardlimit; 263514bf61ffSJan Kara if (di->d_fieldmask & (QC_INO_SOFT | QC_INO_HARD)) { 2636884d179dSJan Kara check_ilim = 1; 263708261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags); 2638884d179dSJan Kara } 2639c472b432SChristoph Hellwig 264014bf61ffSJan Kara if (di->d_fieldmask & QC_SPC_TIMER) { 264114bf61ffSJan Kara dm->dqb_btime = di->d_spc_timer; 2642884d179dSJan Kara check_blim = 1; 264308261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags); 2644884d179dSJan Kara } 2645c472b432SChristoph Hellwig 264614bf61ffSJan Kara if (di->d_fieldmask & QC_INO_TIMER) { 264714bf61ffSJan Kara dm->dqb_itime = di->d_ino_timer; 2648884d179dSJan Kara check_ilim = 1; 264908261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags); 2650884d179dSJan Kara } 2651884d179dSJan Kara 2652884d179dSJan Kara if (check_blim) { 2653268157baSJan Kara if (!dm->dqb_bsoftlimit || 2654268157baSJan Kara dm->dqb_curspace < dm->dqb_bsoftlimit) { 2655884d179dSJan Kara dm->dqb_btime = 0; 2656884d179dSJan Kara clear_bit(DQ_BLKS_B, &dquot->dq_flags); 265714bf61ffSJan Kara } else if (!(di->d_fieldmask & QC_SPC_TIMER)) 2658268157baSJan Kara /* Set grace only if user hasn't provided his own... */ 2659e008bb61SArnd Bergmann dm->dqb_btime = ktime_get_real_seconds() + dqi->dqi_bgrace; 2660884d179dSJan Kara } 2661884d179dSJan Kara if (check_ilim) { 2662268157baSJan Kara if (!dm->dqb_isoftlimit || 2663268157baSJan Kara dm->dqb_curinodes < dm->dqb_isoftlimit) { 2664884d179dSJan Kara dm->dqb_itime = 0; 2665884d179dSJan Kara clear_bit(DQ_INODES_B, &dquot->dq_flags); 266614bf61ffSJan Kara } else if (!(di->d_fieldmask & QC_INO_TIMER)) 2667268157baSJan Kara /* Set grace only if user hasn't provided his own... */ 2668e008bb61SArnd Bergmann dm->dqb_itime = ktime_get_real_seconds() + dqi->dqi_igrace; 2669884d179dSJan Kara } 2670268157baSJan Kara if (dm->dqb_bhardlimit || dm->dqb_bsoftlimit || dm->dqb_ihardlimit || 2671268157baSJan Kara dm->dqb_isoftlimit) 2672884d179dSJan Kara clear_bit(DQ_FAKE_B, &dquot->dq_flags); 2673884d179dSJan Kara else 2674884d179dSJan Kara set_bit(DQ_FAKE_B, &dquot->dq_flags); 2675884d179dSJan Kara spin_unlock(&dq_data_lock); 2676884d179dSJan Kara mark_dquot_dirty(dquot); 2677884d179dSJan Kara 2678884d179dSJan Kara return 0; 2679884d179dSJan Kara } 2680884d179dSJan Kara 268174a8a103SEric W. Biederman int dquot_set_dqblk(struct super_block *sb, struct kqid qid, 268214bf61ffSJan Kara struct qc_dqblk *di) 2683884d179dSJan Kara { 2684884d179dSJan Kara struct dquot *dquot; 2685884d179dSJan Kara int rc; 2686884d179dSJan Kara 2687aca645a6SEric W. Biederman dquot = dqget(sb, qid); 26886184fc0bSJan Kara if (IS_ERR(dquot)) { 26896184fc0bSJan Kara rc = PTR_ERR(dquot); 2690884d179dSJan Kara goto out; 2691884d179dSJan Kara } 2692884d179dSJan Kara rc = do_set_dqblk(dquot, di); 2693884d179dSJan Kara dqput(dquot); 2694884d179dSJan Kara out: 2695884d179dSJan Kara return rc; 2696884d179dSJan Kara } 2697287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_set_dqblk); 2698884d179dSJan Kara 2699884d179dSJan Kara /* Generic routine for getting common part of quota file information */ 27000a240339SJan Kara int dquot_get_state(struct super_block *sb, struct qc_state *state) 2701884d179dSJan Kara { 2702884d179dSJan Kara struct mem_dqinfo *mi; 27030a240339SJan Kara struct qc_type_state *tstate; 27040a240339SJan Kara struct quota_info *dqopt = sb_dqopt(sb); 27050a240339SJan Kara int type; 2706884d179dSJan Kara 27070a240339SJan Kara memset(state, 0, sizeof(*state)); 27080a240339SJan Kara for (type = 0; type < MAXQUOTAS; type++) { 27090a240339SJan Kara if (!sb_has_quota_active(sb, type)) 27100a240339SJan Kara continue; 27110a240339SJan Kara tstate = state->s_state + type; 2712884d179dSJan Kara mi = sb_dqopt(sb)->info + type; 27130a240339SJan Kara tstate->flags = QCI_ACCT_ENABLED; 2714884d179dSJan Kara spin_lock(&dq_data_lock); 27150a240339SJan Kara if (mi->dqi_flags & DQF_SYS_FILE) 27160a240339SJan Kara tstate->flags |= QCI_SYSFILE; 27170a240339SJan Kara if (mi->dqi_flags & DQF_ROOT_SQUASH) 27180a240339SJan Kara tstate->flags |= QCI_ROOT_SQUASH; 27190a240339SJan Kara if (sb_has_quota_limits_enabled(sb, type)) 27200a240339SJan Kara tstate->flags |= QCI_LIMITS_ENFORCED; 27210a240339SJan Kara tstate->spc_timelimit = mi->dqi_bgrace; 27220a240339SJan Kara tstate->ino_timelimit = mi->dqi_igrace; 27230a240339SJan Kara tstate->ino = dqopt->files[type]->i_ino; 27240a240339SJan Kara tstate->blocks = dqopt->files[type]->i_blocks; 27250a240339SJan Kara tstate->nextents = 1; /* We don't know... */ 2726884d179dSJan Kara spin_unlock(&dq_data_lock); 27270a240339SJan Kara } 2728884d179dSJan Kara return 0; 2729884d179dSJan Kara } 27300a240339SJan Kara EXPORT_SYMBOL(dquot_get_state); 2731884d179dSJan Kara 2732884d179dSJan Kara /* Generic routine for setting common part of quota file information */ 27335eacb2acSJan Kara int dquot_set_dqinfo(struct super_block *sb, int type, struct qc_info *ii) 2734884d179dSJan Kara { 2735884d179dSJan Kara struct mem_dqinfo *mi; 2736884d179dSJan Kara int err = 0; 2737884d179dSJan Kara 27385eacb2acSJan Kara if ((ii->i_fieldmask & QC_WARNS_MASK) || 27395eacb2acSJan Kara (ii->i_fieldmask & QC_RT_SPC_TIMER)) 27405eacb2acSJan Kara return -EINVAL; 27419d1ccbe7SJan Kara if (!sb_has_quota_active(sb, type)) 27429d1ccbe7SJan Kara return -ESRCH; 2743884d179dSJan Kara mi = sb_dqopt(sb)->info + type; 27445eacb2acSJan Kara if (ii->i_fieldmask & QC_FLAGS) { 27455eacb2acSJan Kara if ((ii->i_flags & QCI_ROOT_SQUASH && 27469d1ccbe7SJan Kara mi->dqi_format->qf_fmt_id != QFMT_VFS_OLD)) 27479d1ccbe7SJan Kara return -EINVAL; 2748ca6cb091SJan Kara } 2749884d179dSJan Kara spin_lock(&dq_data_lock); 27505eacb2acSJan Kara if (ii->i_fieldmask & QC_SPC_TIMER) 27515eacb2acSJan Kara mi->dqi_bgrace = ii->i_spc_timelimit; 27525eacb2acSJan Kara if (ii->i_fieldmask & QC_INO_TIMER) 27535eacb2acSJan Kara mi->dqi_igrace = ii->i_ino_timelimit; 27545eacb2acSJan Kara if (ii->i_fieldmask & QC_FLAGS) { 27555eacb2acSJan Kara if (ii->i_flags & QCI_ROOT_SQUASH) 27565eacb2acSJan Kara mi->dqi_flags |= DQF_ROOT_SQUASH; 27575eacb2acSJan Kara else 27585eacb2acSJan Kara mi->dqi_flags &= ~DQF_ROOT_SQUASH; 27595eacb2acSJan Kara } 2760884d179dSJan Kara spin_unlock(&dq_data_lock); 2761884d179dSJan Kara mark_info_dirty(sb, type); 2762884d179dSJan Kara /* Force write to disk */ 2763884d179dSJan Kara sb->dq_op->write_info(sb, type); 2764884d179dSJan Kara return err; 2765884d179dSJan Kara } 2766287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_set_dqinfo); 2767884d179dSJan Kara 27683e2af67eSJan Kara const struct quotactl_ops dquot_quotactl_sysfile_ops = { 27693e2af67eSJan Kara .quota_enable = dquot_quota_enable, 27703e2af67eSJan Kara .quota_disable = dquot_quota_disable, 27713e2af67eSJan Kara .quota_sync = dquot_quota_sync, 27720a240339SJan Kara .get_state = dquot_get_state, 27733e2af67eSJan Kara .set_info = dquot_set_dqinfo, 27743e2af67eSJan Kara .get_dqblk = dquot_get_dqblk, 2775be6257b2SJan Kara .get_nextdqblk = dquot_get_next_dqblk, 27763e2af67eSJan Kara .set_dqblk = dquot_set_dqblk 27773e2af67eSJan Kara }; 27783e2af67eSJan Kara EXPORT_SYMBOL(dquot_quotactl_sysfile_ops); 27793e2af67eSJan Kara 2780dde95888SDmitry Monakhov static int do_proc_dqstats(struct ctl_table *table, int write, 2781dde95888SDmitry Monakhov void __user *buffer, size_t *lenp, loff_t *ppos) 2782dde95888SDmitry Monakhov { 2783dde95888SDmitry Monakhov unsigned int type = (int *)table->data - dqstats.stat; 2784f32764bdSDmitry Monakhov 2785f32764bdSDmitry Monakhov /* Update global table */ 2786f32764bdSDmitry Monakhov dqstats.stat[type] = 2787f32764bdSDmitry Monakhov percpu_counter_sum_positive(&dqstats.counter[type]); 2788dde95888SDmitry Monakhov return proc_dointvec(table, write, buffer, lenp, ppos); 2789dde95888SDmitry Monakhov } 2790dde95888SDmitry Monakhov 2791e628753bSJoe Perches static struct ctl_table fs_dqstats_table[] = { 2792884d179dSJan Kara { 2793884d179dSJan Kara .procname = "lookups", 2794dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_LOOKUPS], 2795884d179dSJan Kara .maxlen = sizeof(int), 2796884d179dSJan Kara .mode = 0444, 2797dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2798884d179dSJan Kara }, 2799884d179dSJan Kara { 2800884d179dSJan Kara .procname = "drops", 2801dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_DROPS], 2802884d179dSJan Kara .maxlen = sizeof(int), 2803884d179dSJan Kara .mode = 0444, 2804dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2805884d179dSJan Kara }, 2806884d179dSJan Kara { 2807884d179dSJan Kara .procname = "reads", 2808dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_READS], 2809884d179dSJan Kara .maxlen = sizeof(int), 2810884d179dSJan Kara .mode = 0444, 2811dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2812884d179dSJan Kara }, 2813884d179dSJan Kara { 2814884d179dSJan Kara .procname = "writes", 2815dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_WRITES], 2816884d179dSJan Kara .maxlen = sizeof(int), 2817884d179dSJan Kara .mode = 0444, 2818dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2819884d179dSJan Kara }, 2820884d179dSJan Kara { 2821884d179dSJan Kara .procname = "cache_hits", 2822dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_CACHE_HITS], 2823884d179dSJan Kara .maxlen = sizeof(int), 2824884d179dSJan Kara .mode = 0444, 2825dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2826884d179dSJan Kara }, 2827884d179dSJan Kara { 2828884d179dSJan Kara .procname = "allocated_dquots", 2829dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_ALLOC_DQUOTS], 2830884d179dSJan Kara .maxlen = sizeof(int), 2831884d179dSJan Kara .mode = 0444, 2832dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2833884d179dSJan Kara }, 2834884d179dSJan Kara { 2835884d179dSJan Kara .procname = "free_dquots", 2836dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_FREE_DQUOTS], 2837884d179dSJan Kara .maxlen = sizeof(int), 2838884d179dSJan Kara .mode = 0444, 2839dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2840884d179dSJan Kara }, 2841884d179dSJan Kara { 2842884d179dSJan Kara .procname = "syncs", 2843dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_SYNCS], 2844884d179dSJan Kara .maxlen = sizeof(int), 2845884d179dSJan Kara .mode = 0444, 2846dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2847884d179dSJan Kara }, 2848884d179dSJan Kara #ifdef CONFIG_PRINT_QUOTA_WARNING 2849884d179dSJan Kara { 2850884d179dSJan Kara .procname = "warnings", 2851884d179dSJan Kara .data = &flag_print_warnings, 2852884d179dSJan Kara .maxlen = sizeof(int), 2853884d179dSJan Kara .mode = 0644, 28546d456111SEric W. Biederman .proc_handler = proc_dointvec, 2855884d179dSJan Kara }, 2856884d179dSJan Kara #endif 2857ab09203eSEric W. Biederman { }, 2858884d179dSJan Kara }; 2859884d179dSJan Kara 2860e628753bSJoe Perches static struct ctl_table fs_table[] = { 2861884d179dSJan Kara { 2862884d179dSJan Kara .procname = "quota", 2863884d179dSJan Kara .mode = 0555, 2864884d179dSJan Kara .child = fs_dqstats_table, 2865884d179dSJan Kara }, 2866ab09203eSEric W. Biederman { }, 2867884d179dSJan Kara }; 2868884d179dSJan Kara 2869e628753bSJoe Perches static struct ctl_table sys_table[] = { 2870884d179dSJan Kara { 2871884d179dSJan Kara .procname = "fs", 2872884d179dSJan Kara .mode = 0555, 2873884d179dSJan Kara .child = fs_table, 2874884d179dSJan Kara }, 2875ab09203eSEric W. Biederman { }, 2876884d179dSJan Kara }; 2877884d179dSJan Kara 2878884d179dSJan Kara static int __init dquot_init(void) 2879884d179dSJan Kara { 2880f32764bdSDmitry Monakhov int i, ret; 2881884d179dSJan Kara unsigned long nr_hash, order; 2882884d179dSJan Kara 2883884d179dSJan Kara printk(KERN_NOTICE "VFS: Disk quotas %s\n", __DQUOT_VERSION__); 2884884d179dSJan Kara 2885884d179dSJan Kara register_sysctl_table(sys_table); 2886884d179dSJan Kara 2887884d179dSJan Kara dquot_cachep = kmem_cache_create("dquot", 2888884d179dSJan Kara sizeof(struct dquot), sizeof(unsigned long) * 4, 2889884d179dSJan Kara (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| 2890884d179dSJan Kara SLAB_MEM_SPREAD|SLAB_PANIC), 2891884d179dSJan Kara NULL); 2892884d179dSJan Kara 2893884d179dSJan Kara order = 0; 2894884d179dSJan Kara dquot_hash = (struct hlist_head *)__get_free_pages(GFP_ATOMIC, order); 2895884d179dSJan Kara if (!dquot_hash) 2896884d179dSJan Kara panic("Cannot create dquot hash table"); 2897884d179dSJan Kara 2898f32764bdSDmitry Monakhov for (i = 0; i < _DQST_DQSTAT_LAST; i++) { 2899908c7f19STejun Heo ret = percpu_counter_init(&dqstats.counter[i], 0, GFP_KERNEL); 2900f32764bdSDmitry Monakhov if (ret) 2901f32764bdSDmitry Monakhov panic("Cannot create dquot stat counters"); 2902f32764bdSDmitry Monakhov } 2903dde95888SDmitry Monakhov 2904884d179dSJan Kara /* Find power-of-two hlist_heads which can fit into allocation */ 2905884d179dSJan Kara nr_hash = (1UL << order) * PAGE_SIZE / sizeof(struct hlist_head); 2906884d179dSJan Kara dq_hash_bits = 0; 2907884d179dSJan Kara do { 2908884d179dSJan Kara dq_hash_bits++; 2909884d179dSJan Kara } while (nr_hash >> dq_hash_bits); 2910884d179dSJan Kara dq_hash_bits--; 2911884d179dSJan Kara 2912884d179dSJan Kara nr_hash = 1UL << dq_hash_bits; 2913884d179dSJan Kara dq_hash_mask = nr_hash - 1; 2914884d179dSJan Kara for (i = 0; i < nr_hash; i++) 2915884d179dSJan Kara INIT_HLIST_HEAD(dquot_hash + i); 2916884d179dSJan Kara 291719858e7bSAnton Blanchard pr_info("VFS: Dquot-cache hash table entries: %ld (order %ld," 291819858e7bSAnton Blanchard " %ld bytes)\n", nr_hash, order, (PAGE_SIZE << order)); 2919884d179dSJan Kara 2920884d179dSJan Kara register_shrinker(&dqcache_shrinker); 2921884d179dSJan Kara 2922884d179dSJan Kara return 0; 2923884d179dSJan Kara } 2924331221faSPaul Gortmaker fs_initcall(dquot_init); 2925