1b2441318SGreg Kroah-Hartman // SPDX-License-Identifier: GPL-2.0 2884d179dSJan Kara /* 3884d179dSJan Kara * Implementation of the diskquota system for the LINUX operating system. QUOTA 4884d179dSJan Kara * is implemented using the BSD system call interface as the means of 5884d179dSJan Kara * communication with the user level. This file contains the generic routines 6884d179dSJan Kara * called by the different filesystems on allocation of an inode or block. 7884d179dSJan Kara * These routines take care of the administration needed to have a consistent 8884d179dSJan Kara * diskquota tracking system. The ideas of both user and group quotas are based 9884d179dSJan Kara * on the Melbourne quota system as used on BSD derived systems. The internal 10884d179dSJan Kara * implementation is based on one of the several variants of the LINUX 11884d179dSJan Kara * inode-subsystem with added complexity of the diskquota system. 12884d179dSJan Kara * 13884d179dSJan Kara * Author: Marco van Wieringen <mvw@planets.elm.net> 14884d179dSJan Kara * 15884d179dSJan Kara * Fixes: Dmitry Gorodchanin <pgmdsg@ibi.com>, 11 Feb 96 16884d179dSJan Kara * 17884d179dSJan Kara * Revised list management to avoid races 18884d179dSJan Kara * -- Bill Hawes, <whawes@star.net>, 9/98 19884d179dSJan Kara * 20884d179dSJan Kara * Fixed races in dquot_transfer(), dqget() and dquot_alloc_...(). 21884d179dSJan Kara * As the consequence the locking was moved from dquot_decr_...(), 22884d179dSJan Kara * dquot_incr_...() to calling functions. 23884d179dSJan Kara * invalidate_dquots() now writes modified dquots. 24884d179dSJan Kara * Serialized quota_off() and quota_on() for mount point. 25884d179dSJan Kara * Fixed a few bugs in grow_dquots(). 26884d179dSJan Kara * Fixed deadlock in write_dquot() - we no longer account quotas on 27884d179dSJan Kara * quota files 28884d179dSJan Kara * remove_dquot_ref() moved to inode.c - it now traverses through inodes 29884d179dSJan Kara * add_dquot_ref() restarts after blocking 30884d179dSJan Kara * Added check for bogus uid and fixed check for group in quotactl. 31884d179dSJan Kara * Jan Kara, <jack@suse.cz>, sponsored by SuSE CR, 10-11/99 32884d179dSJan Kara * 33884d179dSJan Kara * Used struct list_head instead of own list struct 34884d179dSJan Kara * Invalidation of referenced dquots is no longer possible 35884d179dSJan Kara * Improved free_dquots list management 36884d179dSJan Kara * Quota and i_blocks are now updated in one place to avoid races 37884d179dSJan Kara * Warnings are now delayed so we won't block in critical section 38884d179dSJan Kara * Write updated not to require dquot lock 39884d179dSJan Kara * Jan Kara, <jack@suse.cz>, 9/2000 40884d179dSJan Kara * 41884d179dSJan Kara * Added dynamic quota structure allocation 42884d179dSJan Kara * Jan Kara <jack@suse.cz> 12/2000 43884d179dSJan Kara * 44884d179dSJan Kara * Rewritten quota interface. Implemented new quota format and 45884d179dSJan Kara * formats registering. 46884d179dSJan Kara * Jan Kara, <jack@suse.cz>, 2001,2002 47884d179dSJan Kara * 48884d179dSJan Kara * New SMP locking. 49884d179dSJan Kara * Jan Kara, <jack@suse.cz>, 10/2002 50884d179dSJan Kara * 51884d179dSJan Kara * Added journalled quota support, fix lock inversion problems 52884d179dSJan Kara * Jan Kara, <jack@suse.cz>, 2003,2004 53884d179dSJan Kara * 54884d179dSJan Kara * (C) Copyright 1994 - 1997 Marco van Wieringen 55884d179dSJan Kara */ 56884d179dSJan Kara 57884d179dSJan Kara #include <linux/errno.h> 58884d179dSJan Kara #include <linux/kernel.h> 59884d179dSJan Kara #include <linux/fs.h> 60884d179dSJan Kara #include <linux/mount.h> 61884d179dSJan Kara #include <linux/mm.h> 62884d179dSJan Kara #include <linux/time.h> 63884d179dSJan Kara #include <linux/types.h> 64884d179dSJan Kara #include <linux/string.h> 65884d179dSJan Kara #include <linux/fcntl.h> 66884d179dSJan Kara #include <linux/stat.h> 67884d179dSJan Kara #include <linux/tty.h> 68884d179dSJan Kara #include <linux/file.h> 69884d179dSJan Kara #include <linux/slab.h> 70884d179dSJan Kara #include <linux/sysctl.h> 71884d179dSJan Kara #include <linux/init.h> 72884d179dSJan Kara #include <linux/module.h> 73884d179dSJan Kara #include <linux/proc_fs.h> 74884d179dSJan Kara #include <linux/security.h> 7540401530SAl Viro #include <linux/sched.h> 765b825c3aSIngo Molnar #include <linux/cred.h> 77884d179dSJan Kara #include <linux/kmod.h> 78884d179dSJan Kara #include <linux/namei.h> 79884d179dSJan Kara #include <linux/capability.h> 80884d179dSJan Kara #include <linux/quotaops.h> 8155fa6091SDave Chinner #include "../internal.h" /* ugh */ 82884d179dSJan Kara 83f3da9310SJeff Liu #include <linux/uaccess.h> 84884d179dSJan Kara 85884d179dSJan Kara /* 867b9ca4c6SJan Kara * There are five quota SMP locks: 877b9ca4c6SJan Kara * * dq_list_lock protects all lists with quotas and quota formats. 887b9ca4c6SJan Kara * * dquot->dq_dqb_lock protects data from dq_dqb 897b9ca4c6SJan Kara * * inode->i_lock protects inode->i_blocks, i_bytes and also guards 907b9ca4c6SJan Kara * consistency of dquot->dq_dqb with inode->i_blocks, i_bytes so that 917b9ca4c6SJan Kara * dquot_transfer() can stabilize amount it transfers 927b9ca4c6SJan Kara * * dq_data_lock protects mem_dqinfo structures and modifications of dquot 937b9ca4c6SJan Kara * pointers in the inode 947b9ca4c6SJan Kara * * dq_state_lock protects modifications of quota state (on quotaon and 957b9ca4c6SJan Kara * quotaoff) and readers who care about latest values take it as well. 96884d179dSJan Kara * 977b9ca4c6SJan Kara * The spinlock ordering is hence: 987b9ca4c6SJan Kara * dq_data_lock > dq_list_lock > i_lock > dquot->dq_dqb_lock, 99884d179dSJan Kara * dq_list_lock > dq_state_lock 100884d179dSJan Kara * 101884d179dSJan Kara * Note that some things (eg. sb pointer, type, id) doesn't change during 102884d179dSJan Kara * the life of the dquot structure and so needn't to be protected by a lock 103884d179dSJan Kara * 104b9ba6f94SNiu Yawei * Operation accessing dquots via inode pointers are protected by dquot_srcu. 105b9ba6f94SNiu Yawei * Operation of reading pointer needs srcu_read_lock(&dquot_srcu), and 106b9ba6f94SNiu Yawei * synchronize_srcu(&dquot_srcu) is called after clearing pointers from 107b9ba6f94SNiu Yawei * inode and before dropping dquot references to avoid use of dquots after 108b9ba6f94SNiu Yawei * they are freed. dq_data_lock is used to serialize the pointer setting and 109b9ba6f94SNiu Yawei * clearing operations. 11026245c94SJan Kara * Special care needs to be taken about S_NOQUOTA inode flag (marking that 11126245c94SJan Kara * inode is a quota file). Functions adding pointers from inode to dquots have 112b9ba6f94SNiu Yawei * to check this flag under dq_data_lock and then (if S_NOQUOTA is not set) they 113b9ba6f94SNiu Yawei * have to do all pointer modifications before dropping dq_data_lock. This makes 11426245c94SJan Kara * sure they cannot race with quotaon which first sets S_NOQUOTA flag and 11526245c94SJan Kara * then drops all pointers to dquots from an inode. 116884d179dSJan Kara * 1175e8cb9b6SJan Kara * Each dquot has its dq_lock mutex. Dquot is locked when it is being read to 1185e8cb9b6SJan Kara * memory (or space for it is being allocated) on the first dqget(), when it is 1195e8cb9b6SJan Kara * being written out, and when it is being released on the last dqput(). The 1205e8cb9b6SJan Kara * allocation and release operations are serialized by the dq_lock and by 1215e8cb9b6SJan Kara * checking the use count in dquot_release(). 122884d179dSJan Kara * 123884d179dSJan Kara * Lock ordering (including related VFS locks) is the following: 124bc8230eeSJan Kara * s_umount > i_mutex > journal_lock > dquot->dq_lock > dqio_sem 125884d179dSJan Kara */ 126884d179dSJan Kara 127c516610cSJan Kara static __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_list_lock); 128c516610cSJan Kara static __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_state_lock); 129c516610cSJan Kara __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_data_lock); 130884d179dSJan Kara EXPORT_SYMBOL(dq_data_lock); 131b9ba6f94SNiu Yawei DEFINE_STATIC_SRCU(dquot_srcu); 132884d179dSJan Kara 133503330f3SJan Kara static DECLARE_WAIT_QUEUE_HEAD(dquot_ref_wq); 134503330f3SJan Kara 135fb5ffb0eSJiaying Zhang void __quota_error(struct super_block *sb, const char *func, 136fb5ffb0eSJiaying Zhang const char *fmt, ...) 137fb5ffb0eSJiaying Zhang { 138fb5ffb0eSJiaying Zhang if (printk_ratelimit()) { 139055adcbdSJoe Perches va_list args; 140055adcbdSJoe Perches struct va_format vaf; 141055adcbdSJoe Perches 142fb5ffb0eSJiaying Zhang va_start(args, fmt); 143055adcbdSJoe Perches 144055adcbdSJoe Perches vaf.fmt = fmt; 145055adcbdSJoe Perches vaf.va = &args; 146055adcbdSJoe Perches 147055adcbdSJoe Perches printk(KERN_ERR "Quota error (device %s): %s: %pV\n", 148055adcbdSJoe Perches sb->s_id, func, &vaf); 149055adcbdSJoe Perches 150fb5ffb0eSJiaying Zhang va_end(args); 151fb5ffb0eSJiaying Zhang } 152fb5ffb0eSJiaying Zhang } 153fb5ffb0eSJiaying Zhang EXPORT_SYMBOL(__quota_error); 154fb5ffb0eSJiaying Zhang 155da8d1ba2SSergey Senozhatsky #if defined(CONFIG_QUOTA_DEBUG) || defined(CONFIG_PRINT_QUOTA_WARNING) 156884d179dSJan Kara static char *quotatypes[] = INITQFNAMES; 157da8d1ba2SSergey Senozhatsky #endif 158884d179dSJan Kara static struct quota_format_type *quota_formats; /* List of registered formats */ 159884d179dSJan Kara static struct quota_module_name module_names[] = INIT_QUOTA_MODULE_NAMES; 160884d179dSJan Kara 161884d179dSJan Kara /* SLAB cache for dquot structures */ 162884d179dSJan Kara static struct kmem_cache *dquot_cachep; 163884d179dSJan Kara 164884d179dSJan Kara int register_quota_format(struct quota_format_type *fmt) 165884d179dSJan Kara { 166884d179dSJan Kara spin_lock(&dq_list_lock); 167884d179dSJan Kara fmt->qf_next = quota_formats; 168884d179dSJan Kara quota_formats = fmt; 169884d179dSJan Kara spin_unlock(&dq_list_lock); 170884d179dSJan Kara return 0; 171884d179dSJan Kara } 172884d179dSJan Kara EXPORT_SYMBOL(register_quota_format); 173884d179dSJan Kara 174884d179dSJan Kara void unregister_quota_format(struct quota_format_type *fmt) 175884d179dSJan Kara { 176884d179dSJan Kara struct quota_format_type **actqf; 177884d179dSJan Kara 178884d179dSJan Kara spin_lock(&dq_list_lock); 179268157baSJan Kara for (actqf = "a_formats; *actqf && *actqf != fmt; 180268157baSJan Kara actqf = &(*actqf)->qf_next) 181268157baSJan Kara ; 182884d179dSJan Kara if (*actqf) 183884d179dSJan Kara *actqf = (*actqf)->qf_next; 184884d179dSJan Kara spin_unlock(&dq_list_lock); 185884d179dSJan Kara } 186884d179dSJan Kara EXPORT_SYMBOL(unregister_quota_format); 187884d179dSJan Kara 188884d179dSJan Kara static struct quota_format_type *find_quota_format(int id) 189884d179dSJan Kara { 190884d179dSJan Kara struct quota_format_type *actqf; 191884d179dSJan Kara 192884d179dSJan Kara spin_lock(&dq_list_lock); 193268157baSJan Kara for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id; 194268157baSJan Kara actqf = actqf->qf_next) 195268157baSJan Kara ; 196884d179dSJan Kara if (!actqf || !try_module_get(actqf->qf_owner)) { 197884d179dSJan Kara int qm; 198884d179dSJan Kara 199884d179dSJan Kara spin_unlock(&dq_list_lock); 200884d179dSJan Kara 201268157baSJan Kara for (qm = 0; module_names[qm].qm_fmt_id && 202268157baSJan Kara module_names[qm].qm_fmt_id != id; qm++) 203268157baSJan Kara ; 204268157baSJan Kara if (!module_names[qm].qm_fmt_id || 205268157baSJan Kara request_module(module_names[qm].qm_mod_name)) 206884d179dSJan Kara return NULL; 207884d179dSJan Kara 208884d179dSJan Kara spin_lock(&dq_list_lock); 209268157baSJan Kara for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id; 210268157baSJan Kara actqf = actqf->qf_next) 211268157baSJan Kara ; 212884d179dSJan Kara if (actqf && !try_module_get(actqf->qf_owner)) 213884d179dSJan Kara actqf = NULL; 214884d179dSJan Kara } 215884d179dSJan Kara spin_unlock(&dq_list_lock); 216884d179dSJan Kara return actqf; 217884d179dSJan Kara } 218884d179dSJan Kara 219884d179dSJan Kara static void put_quota_format(struct quota_format_type *fmt) 220884d179dSJan Kara { 221884d179dSJan Kara module_put(fmt->qf_owner); 222884d179dSJan Kara } 223884d179dSJan Kara 224884d179dSJan Kara /* 225884d179dSJan Kara * Dquot List Management: 226884d179dSJan Kara * The quota code uses three lists for dquot management: the inuse_list, 227884d179dSJan Kara * free_dquots, and dquot_hash[] array. A single dquot structure may be 228884d179dSJan Kara * on all three lists, depending on its current state. 229884d179dSJan Kara * 230884d179dSJan Kara * All dquots are placed to the end of inuse_list when first created, and this 231884d179dSJan Kara * list is used for invalidate operation, which must look at every dquot. 232884d179dSJan Kara * 233884d179dSJan Kara * Unused dquots (dq_count == 0) are added to the free_dquots list when freed, 234884d179dSJan Kara * and this list is searched whenever we need an available dquot. Dquots are 235884d179dSJan Kara * removed from the list as soon as they are used again, and 236884d179dSJan Kara * dqstats.free_dquots gives the number of dquots on the list. When 237884d179dSJan Kara * dquot is invalidated it's completely released from memory. 238884d179dSJan Kara * 239884d179dSJan Kara * Dquots with a specific identity (device, type and id) are placed on 240884d179dSJan Kara * one of the dquot_hash[] hash chains. The provides an efficient search 241884d179dSJan Kara * mechanism to locate a specific dquot. 242884d179dSJan Kara */ 243884d179dSJan Kara 244884d179dSJan Kara static LIST_HEAD(inuse_list); 245884d179dSJan Kara static LIST_HEAD(free_dquots); 246884d179dSJan Kara static unsigned int dq_hash_bits, dq_hash_mask; 247884d179dSJan Kara static struct hlist_head *dquot_hash; 248884d179dSJan Kara 249884d179dSJan Kara struct dqstats dqstats; 250884d179dSJan Kara EXPORT_SYMBOL(dqstats); 251884d179dSJan Kara 2520a5a9c72SJan Kara static qsize_t inode_get_rsv_space(struct inode *inode); 2537b9ca4c6SJan Kara static qsize_t __inode_get_rsv_space(struct inode *inode); 2546184fc0bSJan Kara static int __dquot_initialize(struct inode *inode, int type); 2550a5a9c72SJan Kara 256884d179dSJan Kara static inline unsigned int 2571a06d420SEric W. Biederman hashfn(const struct super_block *sb, struct kqid qid) 258884d179dSJan Kara { 2591a06d420SEric W. Biederman unsigned int id = from_kqid(&init_user_ns, qid); 2601a06d420SEric W. Biederman int type = qid.type; 261884d179dSJan Kara unsigned long tmp; 262884d179dSJan Kara 263884d179dSJan Kara tmp = (((unsigned long)sb>>L1_CACHE_SHIFT) ^ id) * (MAXQUOTAS - type); 264884d179dSJan Kara return (tmp + (tmp >> dq_hash_bits)) & dq_hash_mask; 265884d179dSJan Kara } 266884d179dSJan Kara 267884d179dSJan Kara /* 268884d179dSJan Kara * Following list functions expect dq_list_lock to be held 269884d179dSJan Kara */ 270884d179dSJan Kara static inline void insert_dquot_hash(struct dquot *dquot) 271884d179dSJan Kara { 272268157baSJan Kara struct hlist_head *head; 2731a06d420SEric W. Biederman head = dquot_hash + hashfn(dquot->dq_sb, dquot->dq_id); 274884d179dSJan Kara hlist_add_head(&dquot->dq_hash, head); 275884d179dSJan Kara } 276884d179dSJan Kara 277884d179dSJan Kara static inline void remove_dquot_hash(struct dquot *dquot) 278884d179dSJan Kara { 279884d179dSJan Kara hlist_del_init(&dquot->dq_hash); 280884d179dSJan Kara } 281884d179dSJan Kara 2827a2435d8SJan Kara static struct dquot *find_dquot(unsigned int hashent, struct super_block *sb, 2831a06d420SEric W. Biederman struct kqid qid) 284884d179dSJan Kara { 285884d179dSJan Kara struct hlist_node *node; 286884d179dSJan Kara struct dquot *dquot; 287884d179dSJan Kara 288884d179dSJan Kara hlist_for_each (node, dquot_hash+hashent) { 289884d179dSJan Kara dquot = hlist_entry(node, struct dquot, dq_hash); 2904c376dcaSEric W. Biederman if (dquot->dq_sb == sb && qid_eq(dquot->dq_id, qid)) 291884d179dSJan Kara return dquot; 292884d179dSJan Kara } 293dd6f3c6dSJan Kara return NULL; 294884d179dSJan Kara } 295884d179dSJan Kara 296884d179dSJan Kara /* Add a dquot to the tail of the free list */ 297884d179dSJan Kara static inline void put_dquot_last(struct dquot *dquot) 298884d179dSJan Kara { 299884d179dSJan Kara list_add_tail(&dquot->dq_free, &free_dquots); 300dde95888SDmitry Monakhov dqstats_inc(DQST_FREE_DQUOTS); 301884d179dSJan Kara } 302884d179dSJan Kara 303884d179dSJan Kara static inline void remove_free_dquot(struct dquot *dquot) 304884d179dSJan Kara { 305884d179dSJan Kara if (list_empty(&dquot->dq_free)) 306884d179dSJan Kara return; 307884d179dSJan Kara list_del_init(&dquot->dq_free); 308dde95888SDmitry Monakhov dqstats_dec(DQST_FREE_DQUOTS); 309884d179dSJan Kara } 310884d179dSJan Kara 311884d179dSJan Kara static inline void put_inuse(struct dquot *dquot) 312884d179dSJan Kara { 313884d179dSJan Kara /* We add to the back of inuse list so we don't have to restart 314884d179dSJan Kara * when traversing this list and we block */ 315884d179dSJan Kara list_add_tail(&dquot->dq_inuse, &inuse_list); 316dde95888SDmitry Monakhov dqstats_inc(DQST_ALLOC_DQUOTS); 317884d179dSJan Kara } 318884d179dSJan Kara 319884d179dSJan Kara static inline void remove_inuse(struct dquot *dquot) 320884d179dSJan Kara { 321dde95888SDmitry Monakhov dqstats_dec(DQST_ALLOC_DQUOTS); 322884d179dSJan Kara list_del(&dquot->dq_inuse); 323884d179dSJan Kara } 324884d179dSJan Kara /* 325884d179dSJan Kara * End of list functions needing dq_list_lock 326884d179dSJan Kara */ 327884d179dSJan Kara 328884d179dSJan Kara static void wait_on_dquot(struct dquot *dquot) 329884d179dSJan Kara { 330884d179dSJan Kara mutex_lock(&dquot->dq_lock); 331884d179dSJan Kara mutex_unlock(&dquot->dq_lock); 332884d179dSJan Kara } 333884d179dSJan Kara 334884d179dSJan Kara static inline int dquot_dirty(struct dquot *dquot) 335884d179dSJan Kara { 336884d179dSJan Kara return test_bit(DQ_MOD_B, &dquot->dq_flags); 337884d179dSJan Kara } 338884d179dSJan Kara 339884d179dSJan Kara static inline int mark_dquot_dirty(struct dquot *dquot) 340884d179dSJan Kara { 341884d179dSJan Kara return dquot->dq_sb->dq_op->mark_dirty(dquot); 342884d179dSJan Kara } 343884d179dSJan Kara 344eabf290dSDmitry Monakhov /* Mark dquot dirty in atomic manner, and return it's old dirty flag state */ 345884d179dSJan Kara int dquot_mark_dquot_dirty(struct dquot *dquot) 346884d179dSJan Kara { 347eabf290dSDmitry Monakhov int ret = 1; 348eabf290dSDmitry Monakhov 3494580b30eSJan Kara if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) 3504580b30eSJan Kara return 0; 3514580b30eSJan Kara 352834057bfSJan Kara if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NOLIST_DIRTY) 353834057bfSJan Kara return test_and_set_bit(DQ_MOD_B, &dquot->dq_flags); 354834057bfSJan Kara 355eabf290dSDmitry Monakhov /* If quota is dirty already, we don't have to acquire dq_list_lock */ 356eabf290dSDmitry Monakhov if (test_bit(DQ_MOD_B, &dquot->dq_flags)) 357eabf290dSDmitry Monakhov return 1; 358eabf290dSDmitry Monakhov 359884d179dSJan Kara spin_lock(&dq_list_lock); 360eabf290dSDmitry Monakhov if (!test_and_set_bit(DQ_MOD_B, &dquot->dq_flags)) { 361884d179dSJan Kara list_add(&dquot->dq_dirty, &sb_dqopt(dquot->dq_sb)-> 3624c376dcaSEric W. Biederman info[dquot->dq_id.type].dqi_dirty_list); 363eabf290dSDmitry Monakhov ret = 0; 364eabf290dSDmitry Monakhov } 365884d179dSJan Kara spin_unlock(&dq_list_lock); 366eabf290dSDmitry Monakhov return ret; 367884d179dSJan Kara } 368884d179dSJan Kara EXPORT_SYMBOL(dquot_mark_dquot_dirty); 369884d179dSJan Kara 370dc52dd3aSDmitry Monakhov /* Dirtify all the dquots - this can block when journalling */ 371dc52dd3aSDmitry Monakhov static inline int mark_all_dquot_dirty(struct dquot * const *dquot) 372dc52dd3aSDmitry Monakhov { 373dc52dd3aSDmitry Monakhov int ret, err, cnt; 374dc52dd3aSDmitry Monakhov 375dc52dd3aSDmitry Monakhov ret = err = 0; 376dc52dd3aSDmitry Monakhov for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 377dc52dd3aSDmitry Monakhov if (dquot[cnt]) 378dc52dd3aSDmitry Monakhov /* Even in case of error we have to continue */ 379dc52dd3aSDmitry Monakhov ret = mark_dquot_dirty(dquot[cnt]); 380dc52dd3aSDmitry Monakhov if (!err) 381dc52dd3aSDmitry Monakhov err = ret; 382dc52dd3aSDmitry Monakhov } 383dc52dd3aSDmitry Monakhov return err; 384dc52dd3aSDmitry Monakhov } 385dc52dd3aSDmitry Monakhov 386dc52dd3aSDmitry Monakhov static inline void dqput_all(struct dquot **dquot) 387dc52dd3aSDmitry Monakhov { 388dc52dd3aSDmitry Monakhov unsigned int cnt; 389dc52dd3aSDmitry Monakhov 390dc52dd3aSDmitry Monakhov for (cnt = 0; cnt < MAXQUOTAS; cnt++) 391dc52dd3aSDmitry Monakhov dqput(dquot[cnt]); 392dc52dd3aSDmitry Monakhov } 393dc52dd3aSDmitry Monakhov 394884d179dSJan Kara static inline int clear_dquot_dirty(struct dquot *dquot) 395884d179dSJan Kara { 396834057bfSJan Kara if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NOLIST_DIRTY) 397834057bfSJan Kara return test_and_clear_bit(DQ_MOD_B, &dquot->dq_flags); 398834057bfSJan Kara 3991e0b7cb0SJan Kara spin_lock(&dq_list_lock); 4001e0b7cb0SJan Kara if (!test_and_clear_bit(DQ_MOD_B, &dquot->dq_flags)) { 4011e0b7cb0SJan Kara spin_unlock(&dq_list_lock); 402884d179dSJan Kara return 0; 4031e0b7cb0SJan Kara } 404884d179dSJan Kara list_del_init(&dquot->dq_dirty); 4051e0b7cb0SJan Kara spin_unlock(&dq_list_lock); 406884d179dSJan Kara return 1; 407884d179dSJan Kara } 408884d179dSJan Kara 409884d179dSJan Kara void mark_info_dirty(struct super_block *sb, int type) 410884d179dSJan Kara { 41115512377SJan Kara spin_lock(&dq_data_lock); 41215512377SJan Kara sb_dqopt(sb)->info[type].dqi_flags |= DQF_INFO_DIRTY; 41315512377SJan Kara spin_unlock(&dq_data_lock); 414884d179dSJan Kara } 415884d179dSJan Kara EXPORT_SYMBOL(mark_info_dirty); 416884d179dSJan Kara 417884d179dSJan Kara /* 418884d179dSJan Kara * Read dquot from disk and alloc space for it 419884d179dSJan Kara */ 420884d179dSJan Kara 421884d179dSJan Kara int dquot_acquire(struct dquot *dquot) 422884d179dSJan Kara { 423884d179dSJan Kara int ret = 0, ret2 = 0; 424884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); 425884d179dSJan Kara 426884d179dSJan Kara mutex_lock(&dquot->dq_lock); 427884d179dSJan Kara if (!test_bit(DQ_READ_B, &dquot->dq_flags)) 4284c376dcaSEric W. Biederman ret = dqopt->ops[dquot->dq_id.type]->read_dqblk(dquot); 429884d179dSJan Kara if (ret < 0) 430884d179dSJan Kara goto out_iolock; 431044c9b67SJan Kara /* Make sure flags update is visible after dquot has been filled */ 432044c9b67SJan Kara smp_mb__before_atomic(); 433884d179dSJan Kara set_bit(DQ_READ_B, &dquot->dq_flags); 434884d179dSJan Kara /* Instantiate dquot if needed */ 435884d179dSJan Kara if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && !dquot->dq_off) { 4364c376dcaSEric W. Biederman ret = dqopt->ops[dquot->dq_id.type]->commit_dqblk(dquot); 437884d179dSJan Kara /* Write the info if needed */ 4384c376dcaSEric W. Biederman if (info_dirty(&dqopt->info[dquot->dq_id.type])) { 4394c376dcaSEric W. Biederman ret2 = dqopt->ops[dquot->dq_id.type]->write_file_info( 4404c376dcaSEric W. Biederman dquot->dq_sb, dquot->dq_id.type); 441268157baSJan Kara } 442884d179dSJan Kara if (ret < 0) 443884d179dSJan Kara goto out_iolock; 444884d179dSJan Kara if (ret2 < 0) { 445884d179dSJan Kara ret = ret2; 446884d179dSJan Kara goto out_iolock; 447884d179dSJan Kara } 448884d179dSJan Kara } 449044c9b67SJan Kara /* 450044c9b67SJan Kara * Make sure flags update is visible after on-disk struct has been 451044c9b67SJan Kara * allocated. Paired with smp_rmb() in dqget(). 452044c9b67SJan Kara */ 453044c9b67SJan Kara smp_mb__before_atomic(); 454884d179dSJan Kara set_bit(DQ_ACTIVE_B, &dquot->dq_flags); 455884d179dSJan Kara out_iolock: 456884d179dSJan Kara mutex_unlock(&dquot->dq_lock); 457884d179dSJan Kara return ret; 458884d179dSJan Kara } 459884d179dSJan Kara EXPORT_SYMBOL(dquot_acquire); 460884d179dSJan Kara 461884d179dSJan Kara /* 462884d179dSJan Kara * Write dquot to disk 463884d179dSJan Kara */ 464884d179dSJan Kara int dquot_commit(struct dquot *dquot) 465884d179dSJan Kara { 466b03f2456SJan Kara int ret = 0; 467884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); 468884d179dSJan Kara 4695e8cb9b6SJan Kara mutex_lock(&dquot->dq_lock); 4701e0b7cb0SJan Kara if (!clear_dquot_dirty(dquot)) 4715e8cb9b6SJan Kara goto out_lock; 472884d179dSJan Kara /* Inactive dquot can be only if there was error during read/init 473884d179dSJan Kara * => we have better not writing it */ 474b03f2456SJan Kara if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) 4754c376dcaSEric W. Biederman ret = dqopt->ops[dquot->dq_id.type]->commit_dqblk(dquot); 476b03f2456SJan Kara else 477b03f2456SJan Kara ret = -EIO; 4785e8cb9b6SJan Kara out_lock: 4795e8cb9b6SJan Kara mutex_unlock(&dquot->dq_lock); 480884d179dSJan Kara return ret; 481884d179dSJan Kara } 482884d179dSJan Kara EXPORT_SYMBOL(dquot_commit); 483884d179dSJan Kara 484884d179dSJan Kara /* 485884d179dSJan Kara * Release dquot 486884d179dSJan Kara */ 487884d179dSJan Kara int dquot_release(struct dquot *dquot) 488884d179dSJan Kara { 489884d179dSJan Kara int ret = 0, ret2 = 0; 490884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); 491884d179dSJan Kara 492884d179dSJan Kara mutex_lock(&dquot->dq_lock); 493884d179dSJan Kara /* Check whether we are not racing with some other dqget() */ 494884d179dSJan Kara if (atomic_read(&dquot->dq_count) > 1) 495884d179dSJan Kara goto out_dqlock; 4964c376dcaSEric W. Biederman if (dqopt->ops[dquot->dq_id.type]->release_dqblk) { 4974c376dcaSEric W. Biederman ret = dqopt->ops[dquot->dq_id.type]->release_dqblk(dquot); 498884d179dSJan Kara /* Write the info */ 4994c376dcaSEric W. Biederman if (info_dirty(&dqopt->info[dquot->dq_id.type])) { 5004c376dcaSEric W. Biederman ret2 = dqopt->ops[dquot->dq_id.type]->write_file_info( 5014c376dcaSEric W. Biederman dquot->dq_sb, dquot->dq_id.type); 502268157baSJan Kara } 503884d179dSJan Kara if (ret >= 0) 504884d179dSJan Kara ret = ret2; 505884d179dSJan Kara } 506884d179dSJan Kara clear_bit(DQ_ACTIVE_B, &dquot->dq_flags); 507884d179dSJan Kara out_dqlock: 508884d179dSJan Kara mutex_unlock(&dquot->dq_lock); 509884d179dSJan Kara return ret; 510884d179dSJan Kara } 511884d179dSJan Kara EXPORT_SYMBOL(dquot_release); 512884d179dSJan Kara 513884d179dSJan Kara void dquot_destroy(struct dquot *dquot) 514884d179dSJan Kara { 515884d179dSJan Kara kmem_cache_free(dquot_cachep, dquot); 516884d179dSJan Kara } 517884d179dSJan Kara EXPORT_SYMBOL(dquot_destroy); 518884d179dSJan Kara 519884d179dSJan Kara static inline void do_destroy_dquot(struct dquot *dquot) 520884d179dSJan Kara { 521884d179dSJan Kara dquot->dq_sb->dq_op->destroy_dquot(dquot); 522884d179dSJan Kara } 523884d179dSJan Kara 524884d179dSJan Kara /* Invalidate all dquots on the list. Note that this function is called after 525884d179dSJan Kara * quota is disabled and pointers from inodes removed so there cannot be new 526884d179dSJan Kara * quota users. There can still be some users of quotas due to inodes being 527884d179dSJan Kara * just deleted or pruned by prune_icache() (those are not attached to any 528884d179dSJan Kara * list) or parallel quotactl call. We have to wait for such users. 529884d179dSJan Kara */ 530884d179dSJan Kara static void invalidate_dquots(struct super_block *sb, int type) 531884d179dSJan Kara { 532884d179dSJan Kara struct dquot *dquot, *tmp; 533884d179dSJan Kara 534884d179dSJan Kara restart: 535884d179dSJan Kara spin_lock(&dq_list_lock); 536884d179dSJan Kara list_for_each_entry_safe(dquot, tmp, &inuse_list, dq_inuse) { 537884d179dSJan Kara if (dquot->dq_sb != sb) 538884d179dSJan Kara continue; 5394c376dcaSEric W. Biederman if (dquot->dq_id.type != type) 540884d179dSJan Kara continue; 541884d179dSJan Kara /* Wait for dquot users */ 542884d179dSJan Kara if (atomic_read(&dquot->dq_count)) { 5439f985cb6SJan Kara dqgrab(dquot); 544884d179dSJan Kara spin_unlock(&dq_list_lock); 545503330f3SJan Kara /* 546503330f3SJan Kara * Once dqput() wakes us up, we know it's time to free 547884d179dSJan Kara * the dquot. 548884d179dSJan Kara * IMPORTANT: we rely on the fact that there is always 549884d179dSJan Kara * at most one process waiting for dquot to free. 550884d179dSJan Kara * Otherwise dq_count would be > 1 and we would never 551884d179dSJan Kara * wake up. 552884d179dSJan Kara */ 553503330f3SJan Kara wait_event(dquot_ref_wq, 554503330f3SJan Kara atomic_read(&dquot->dq_count) == 1); 555884d179dSJan Kara dqput(dquot); 556884d179dSJan Kara /* At this moment dquot() need not exist (it could be 557884d179dSJan Kara * reclaimed by prune_dqcache(). Hence we must 558884d179dSJan Kara * restart. */ 559884d179dSJan Kara goto restart; 560884d179dSJan Kara } 561884d179dSJan Kara /* 562884d179dSJan Kara * Quota now has no users and it has been written on last 563884d179dSJan Kara * dqput() 564884d179dSJan Kara */ 565884d179dSJan Kara remove_dquot_hash(dquot); 566884d179dSJan Kara remove_free_dquot(dquot); 567884d179dSJan Kara remove_inuse(dquot); 568884d179dSJan Kara do_destroy_dquot(dquot); 569884d179dSJan Kara } 570884d179dSJan Kara spin_unlock(&dq_list_lock); 571884d179dSJan Kara } 572884d179dSJan Kara 573884d179dSJan Kara /* Call callback for every active dquot on given filesystem */ 574884d179dSJan Kara int dquot_scan_active(struct super_block *sb, 575884d179dSJan Kara int (*fn)(struct dquot *dquot, unsigned long priv), 576884d179dSJan Kara unsigned long priv) 577884d179dSJan Kara { 578884d179dSJan Kara struct dquot *dquot, *old_dquot = NULL; 579884d179dSJan Kara int ret = 0; 580884d179dSJan Kara 581ee1ac541SJan Kara WARN_ON_ONCE(!rwsem_is_locked(&sb->s_umount)); 582ee1ac541SJan Kara 583884d179dSJan Kara spin_lock(&dq_list_lock); 584884d179dSJan Kara list_for_each_entry(dquot, &inuse_list, dq_inuse) { 585884d179dSJan Kara if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) 586884d179dSJan Kara continue; 587884d179dSJan Kara if (dquot->dq_sb != sb) 588884d179dSJan Kara continue; 589884d179dSJan Kara /* Now we have active dquot so we can just increase use count */ 590884d179dSJan Kara atomic_inc(&dquot->dq_count); 591884d179dSJan Kara spin_unlock(&dq_list_lock); 592dde95888SDmitry Monakhov dqstats_inc(DQST_LOOKUPS); 593884d179dSJan Kara dqput(old_dquot); 594884d179dSJan Kara old_dquot = dquot; 5951362f4eaSJan Kara /* 5961362f4eaSJan Kara * ->release_dquot() can be racing with us. Our reference 5971362f4eaSJan Kara * protects us from new calls to it so just wait for any 5981362f4eaSJan Kara * outstanding call and recheck the DQ_ACTIVE_B after that. 5991362f4eaSJan Kara */ 6001362f4eaSJan Kara wait_on_dquot(dquot); 6011362f4eaSJan Kara if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { 602884d179dSJan Kara ret = fn(dquot, priv); 603884d179dSJan Kara if (ret < 0) 604884d179dSJan Kara goto out; 6051362f4eaSJan Kara } 606884d179dSJan Kara spin_lock(&dq_list_lock); 607884d179dSJan Kara /* We are safe to continue now because our dquot could not 608884d179dSJan Kara * be moved out of the inuse list while we hold the reference */ 609884d179dSJan Kara } 610884d179dSJan Kara spin_unlock(&dq_list_lock); 611884d179dSJan Kara out: 612884d179dSJan Kara dqput(old_dquot); 613884d179dSJan Kara return ret; 614884d179dSJan Kara } 615884d179dSJan Kara EXPORT_SYMBOL(dquot_scan_active); 616884d179dSJan Kara 617ceed1723SJan Kara /* Write all dquot structures to quota files */ 618ceed1723SJan Kara int dquot_writeback_dquots(struct super_block *sb, int type) 619884d179dSJan Kara { 620884d179dSJan Kara struct list_head *dirty; 621884d179dSJan Kara struct dquot *dquot; 622884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 623884d179dSJan Kara int cnt; 624ceed1723SJan Kara int err, ret = 0; 625884d179dSJan Kara 6269d1ccbe7SJan Kara WARN_ON_ONCE(!rwsem_is_locked(&sb->s_umount)); 6279d1ccbe7SJan Kara 628884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 629884d179dSJan Kara if (type != -1 && cnt != type) 630884d179dSJan Kara continue; 631884d179dSJan Kara if (!sb_has_quota_active(sb, cnt)) 632884d179dSJan Kara continue; 633884d179dSJan Kara spin_lock(&dq_list_lock); 634884d179dSJan Kara dirty = &dqopt->info[cnt].dqi_dirty_list; 635884d179dSJan Kara while (!list_empty(dirty)) { 636268157baSJan Kara dquot = list_first_entry(dirty, struct dquot, 637268157baSJan Kara dq_dirty); 6384580b30eSJan Kara 6394580b30eSJan Kara WARN_ON(!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)); 6404580b30eSJan Kara 641884d179dSJan Kara /* Now we have active dquot from which someone is 642884d179dSJan Kara * holding reference so we can safely just increase 643884d179dSJan Kara * use count */ 6449f985cb6SJan Kara dqgrab(dquot); 645884d179dSJan Kara spin_unlock(&dq_list_lock); 646dde95888SDmitry Monakhov dqstats_inc(DQST_LOOKUPS); 647ceed1723SJan Kara err = sb->dq_op->write_dquot(dquot); 648dd5f6279Szhangyi (F) if (err) { 649dd5f6279Szhangyi (F) /* 650dd5f6279Szhangyi (F) * Clear dirty bit anyway to avoid infinite 651dd5f6279Szhangyi (F) * loop here. 652dd5f6279Szhangyi (F) */ 653dd5f6279Szhangyi (F) clear_dquot_dirty(dquot); 654dd5f6279Szhangyi (F) if (!ret) 655474d2605SJan Kara ret = err; 656dd5f6279Szhangyi (F) } 657884d179dSJan Kara dqput(dquot); 658884d179dSJan Kara spin_lock(&dq_list_lock); 659884d179dSJan Kara } 660884d179dSJan Kara spin_unlock(&dq_list_lock); 661884d179dSJan Kara } 662884d179dSJan Kara 663884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 664884d179dSJan Kara if ((cnt == type || type == -1) && sb_has_quota_active(sb, cnt) 665884d179dSJan Kara && info_dirty(&dqopt->info[cnt])) 666884d179dSJan Kara sb->dq_op->write_info(sb, cnt); 667dde95888SDmitry Monakhov dqstats_inc(DQST_SYNCS); 668884d179dSJan Kara 669ceed1723SJan Kara return ret; 670ceed1723SJan Kara } 671ceed1723SJan Kara EXPORT_SYMBOL(dquot_writeback_dquots); 672ceed1723SJan Kara 673ceed1723SJan Kara /* Write all dquot structures to disk and make them visible from userspace */ 674ceed1723SJan Kara int dquot_quota_sync(struct super_block *sb, int type) 675ceed1723SJan Kara { 676ceed1723SJan Kara struct quota_info *dqopt = sb_dqopt(sb); 677ceed1723SJan Kara int cnt; 678ceed1723SJan Kara int ret; 679ceed1723SJan Kara 680ceed1723SJan Kara ret = dquot_writeback_dquots(sb, type); 681ceed1723SJan Kara if (ret) 682ceed1723SJan Kara return ret; 683ceed1723SJan Kara if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) 6845fb324adSChristoph Hellwig return 0; 6855fb324adSChristoph Hellwig 6865fb324adSChristoph Hellwig /* This is not very clever (and fast) but currently I don't know about 6875fb324adSChristoph Hellwig * any other simple way of getting quota data to disk and we must get 6885fb324adSChristoph Hellwig * them there for userspace to be visible... */ 6895fb324adSChristoph Hellwig if (sb->s_op->sync_fs) 6905fb324adSChristoph Hellwig sb->s_op->sync_fs(sb, 1); 6915fb324adSChristoph Hellwig sync_blockdev(sb->s_bdev); 6925fb324adSChristoph Hellwig 6935fb324adSChristoph Hellwig /* 6945fb324adSChristoph Hellwig * Now when everything is written we can discard the pagecache so 6955fb324adSChristoph Hellwig * that userspace sees the changes. 6965fb324adSChristoph Hellwig */ 6975fb324adSChristoph Hellwig for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 6985fb324adSChristoph Hellwig if (type != -1 && cnt != type) 6995fb324adSChristoph Hellwig continue; 7005fb324adSChristoph Hellwig if (!sb_has_quota_active(sb, cnt)) 7015fb324adSChristoph Hellwig continue; 7025955102cSAl Viro inode_lock(dqopt->files[cnt]); 703f9ef1784SJan Kara truncate_inode_pages(&dqopt->files[cnt]->i_data, 0); 7045955102cSAl Viro inode_unlock(dqopt->files[cnt]); 7055fb324adSChristoph Hellwig } 7065fb324adSChristoph Hellwig 707884d179dSJan Kara return 0; 708884d179dSJan Kara } 709287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_quota_sync); 710884d179dSJan Kara 7111ab6c499SDave Chinner static unsigned long 7121ab6c499SDave Chinner dqcache_shrink_scan(struct shrinker *shrink, struct shrink_control *sc) 713884d179dSJan Kara { 714884d179dSJan Kara struct list_head *head; 715884d179dSJan Kara struct dquot *dquot; 7161ab6c499SDave Chinner unsigned long freed = 0; 717884d179dSJan Kara 718d68aab6bSNiu Yawei spin_lock(&dq_list_lock); 719884d179dSJan Kara head = free_dquots.prev; 7201ab6c499SDave Chinner while (head != &free_dquots && sc->nr_to_scan) { 721884d179dSJan Kara dquot = list_entry(head, struct dquot, dq_free); 722884d179dSJan Kara remove_dquot_hash(dquot); 723884d179dSJan Kara remove_free_dquot(dquot); 724884d179dSJan Kara remove_inuse(dquot); 725884d179dSJan Kara do_destroy_dquot(dquot); 7261ab6c499SDave Chinner sc->nr_to_scan--; 7271ab6c499SDave Chinner freed++; 728884d179dSJan Kara head = free_dquots.prev; 729884d179dSJan Kara } 730d68aab6bSNiu Yawei spin_unlock(&dq_list_lock); 7311ab6c499SDave Chinner return freed; 732884d179dSJan Kara } 733884d179dSJan Kara 7341ab6c499SDave Chinner static unsigned long 7351ab6c499SDave Chinner dqcache_shrink_count(struct shrinker *shrink, struct shrink_control *sc) 736884d179dSJan Kara { 73755f841ceSGlauber Costa return vfs_pressure_ratio( 73855f841ceSGlauber Costa percpu_counter_read_positive(&dqstats.counter[DQST_FREE_DQUOTS])); 739884d179dSJan Kara } 740884d179dSJan Kara 741884d179dSJan Kara static struct shrinker dqcache_shrinker = { 7421ab6c499SDave Chinner .count_objects = dqcache_shrink_count, 7431ab6c499SDave Chinner .scan_objects = dqcache_shrink_scan, 744884d179dSJan Kara .seeks = DEFAULT_SEEKS, 745884d179dSJan Kara }; 746884d179dSJan Kara 747884d179dSJan Kara /* 748884d179dSJan Kara * Put reference to dquot 749884d179dSJan Kara */ 750884d179dSJan Kara void dqput(struct dquot *dquot) 751884d179dSJan Kara { 752884d179dSJan Kara int ret; 753884d179dSJan Kara 754884d179dSJan Kara if (!dquot) 755884d179dSJan Kara return; 75662af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 757884d179dSJan Kara if (!atomic_read(&dquot->dq_count)) { 758fb5ffb0eSJiaying Zhang quota_error(dquot->dq_sb, "trying to free free dquot of %s %d", 7594c376dcaSEric W. Biederman quotatypes[dquot->dq_id.type], 7604c376dcaSEric W. Biederman from_kqid(&init_user_ns, dquot->dq_id)); 761884d179dSJan Kara BUG(); 762884d179dSJan Kara } 763884d179dSJan Kara #endif 764dde95888SDmitry Monakhov dqstats_inc(DQST_DROPS); 765884d179dSJan Kara we_slept: 766884d179dSJan Kara spin_lock(&dq_list_lock); 767884d179dSJan Kara if (atomic_read(&dquot->dq_count) > 1) { 768884d179dSJan Kara /* We have more than one user... nothing to do */ 769884d179dSJan Kara atomic_dec(&dquot->dq_count); 770884d179dSJan Kara /* Releasing dquot during quotaoff phase? */ 7714c376dcaSEric W. Biederman if (!sb_has_quota_active(dquot->dq_sb, dquot->dq_id.type) && 772884d179dSJan Kara atomic_read(&dquot->dq_count) == 1) 773503330f3SJan Kara wake_up(&dquot_ref_wq); 774884d179dSJan Kara spin_unlock(&dq_list_lock); 775884d179dSJan Kara return; 776884d179dSJan Kara } 777884d179dSJan Kara /* Need to release dquot? */ 7784580b30eSJan Kara if (dquot_dirty(dquot)) { 779884d179dSJan Kara spin_unlock(&dq_list_lock); 780884d179dSJan Kara /* Commit dquot before releasing */ 781884d179dSJan Kara ret = dquot->dq_sb->dq_op->write_dquot(dquot); 782884d179dSJan Kara if (ret < 0) { 783fb5ffb0eSJiaying Zhang quota_error(dquot->dq_sb, "Can't write quota structure" 784fb5ffb0eSJiaying Zhang " (error %d). Quota may get out of sync!", 785fb5ffb0eSJiaying Zhang ret); 786884d179dSJan Kara /* 787884d179dSJan Kara * We clear dirty bit anyway, so that we avoid 788884d179dSJan Kara * infinite loop here 789884d179dSJan Kara */ 790884d179dSJan Kara clear_dquot_dirty(dquot); 791884d179dSJan Kara } 792884d179dSJan Kara goto we_slept; 793884d179dSJan Kara } 794884d179dSJan Kara if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { 795884d179dSJan Kara spin_unlock(&dq_list_lock); 796884d179dSJan Kara dquot->dq_sb->dq_op->release_dquot(dquot); 797884d179dSJan Kara goto we_slept; 798884d179dSJan Kara } 799884d179dSJan Kara atomic_dec(&dquot->dq_count); 80062af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 801884d179dSJan Kara /* sanity check */ 802884d179dSJan Kara BUG_ON(!list_empty(&dquot->dq_free)); 803884d179dSJan Kara #endif 804884d179dSJan Kara put_dquot_last(dquot); 805884d179dSJan Kara spin_unlock(&dq_list_lock); 806884d179dSJan Kara } 807884d179dSJan Kara EXPORT_SYMBOL(dqput); 808884d179dSJan Kara 809884d179dSJan Kara struct dquot *dquot_alloc(struct super_block *sb, int type) 810884d179dSJan Kara { 811884d179dSJan Kara return kmem_cache_zalloc(dquot_cachep, GFP_NOFS); 812884d179dSJan Kara } 813884d179dSJan Kara EXPORT_SYMBOL(dquot_alloc); 814884d179dSJan Kara 815884d179dSJan Kara static struct dquot *get_empty_dquot(struct super_block *sb, int type) 816884d179dSJan Kara { 817884d179dSJan Kara struct dquot *dquot; 818884d179dSJan Kara 819884d179dSJan Kara dquot = sb->dq_op->alloc_dquot(sb, type); 820884d179dSJan Kara if(!dquot) 821dd6f3c6dSJan Kara return NULL; 822884d179dSJan Kara 823884d179dSJan Kara mutex_init(&dquot->dq_lock); 824884d179dSJan Kara INIT_LIST_HEAD(&dquot->dq_free); 825884d179dSJan Kara INIT_LIST_HEAD(&dquot->dq_inuse); 826884d179dSJan Kara INIT_HLIST_NODE(&dquot->dq_hash); 827884d179dSJan Kara INIT_LIST_HEAD(&dquot->dq_dirty); 828884d179dSJan Kara dquot->dq_sb = sb; 8291a06d420SEric W. Biederman dquot->dq_id = make_kqid_invalid(type); 830884d179dSJan Kara atomic_set(&dquot->dq_count, 1); 8317b9ca4c6SJan Kara spin_lock_init(&dquot->dq_dqb_lock); 832884d179dSJan Kara 833884d179dSJan Kara return dquot; 834884d179dSJan Kara } 835884d179dSJan Kara 836884d179dSJan Kara /* 837884d179dSJan Kara * Get reference to dquot 838884d179dSJan Kara * 839884d179dSJan Kara * Locking is slightly tricky here. We are guarded from parallel quotaoff() 840884d179dSJan Kara * destroying our dquot by: 841884d179dSJan Kara * a) checking for quota flags under dq_list_lock and 842884d179dSJan Kara * b) getting a reference to dquot before we release dq_list_lock 843884d179dSJan Kara */ 844aca645a6SEric W. Biederman struct dquot *dqget(struct super_block *sb, struct kqid qid) 845884d179dSJan Kara { 8461a06d420SEric W. Biederman unsigned int hashent = hashfn(sb, qid); 8476184fc0bSJan Kara struct dquot *dquot, *empty = NULL; 848884d179dSJan Kara 849d49d3762SEric W. Biederman if (!qid_has_mapping(sb->s_user_ns, qid)) 850d49d3762SEric W. Biederman return ERR_PTR(-EINVAL); 851d49d3762SEric W. Biederman 8521a06d420SEric W. Biederman if (!sb_has_quota_active(sb, qid.type)) 8536184fc0bSJan Kara return ERR_PTR(-ESRCH); 854884d179dSJan Kara we_slept: 855884d179dSJan Kara spin_lock(&dq_list_lock); 856884d179dSJan Kara spin_lock(&dq_state_lock); 8571a06d420SEric W. Biederman if (!sb_has_quota_active(sb, qid.type)) { 858884d179dSJan Kara spin_unlock(&dq_state_lock); 859884d179dSJan Kara spin_unlock(&dq_list_lock); 8606184fc0bSJan Kara dquot = ERR_PTR(-ESRCH); 861884d179dSJan Kara goto out; 862884d179dSJan Kara } 863884d179dSJan Kara spin_unlock(&dq_state_lock); 864884d179dSJan Kara 8651a06d420SEric W. Biederman dquot = find_dquot(hashent, sb, qid); 866dd6f3c6dSJan Kara if (!dquot) { 867dd6f3c6dSJan Kara if (!empty) { 868884d179dSJan Kara spin_unlock(&dq_list_lock); 8691a06d420SEric W. Biederman empty = get_empty_dquot(sb, qid.type); 870dd6f3c6dSJan Kara if (!empty) 871884d179dSJan Kara schedule(); /* Try to wait for a moment... */ 872884d179dSJan Kara goto we_slept; 873884d179dSJan Kara } 874884d179dSJan Kara dquot = empty; 875dd6f3c6dSJan Kara empty = NULL; 8764c376dcaSEric W. Biederman dquot->dq_id = qid; 877884d179dSJan Kara /* all dquots go on the inuse_list */ 878884d179dSJan Kara put_inuse(dquot); 879884d179dSJan Kara /* hash it first so it can be found */ 880884d179dSJan Kara insert_dquot_hash(dquot); 881884d179dSJan Kara spin_unlock(&dq_list_lock); 882dde95888SDmitry Monakhov dqstats_inc(DQST_LOOKUPS); 883884d179dSJan Kara } else { 884884d179dSJan Kara if (!atomic_read(&dquot->dq_count)) 885884d179dSJan Kara remove_free_dquot(dquot); 886884d179dSJan Kara atomic_inc(&dquot->dq_count); 887884d179dSJan Kara spin_unlock(&dq_list_lock); 888dde95888SDmitry Monakhov dqstats_inc(DQST_CACHE_HITS); 889dde95888SDmitry Monakhov dqstats_inc(DQST_LOOKUPS); 890884d179dSJan Kara } 891268157baSJan Kara /* Wait for dq_lock - after this we know that either dquot_release() is 892268157baSJan Kara * already finished or it will be canceled due to dq_count > 1 test */ 893884d179dSJan Kara wait_on_dquot(dquot); 894268157baSJan Kara /* Read the dquot / allocate space in quota file */ 8956184fc0bSJan Kara if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { 8966184fc0bSJan Kara int err; 8976184fc0bSJan Kara 8986184fc0bSJan Kara err = sb->dq_op->acquire_dquot(dquot); 8996184fc0bSJan Kara if (err < 0) { 900884d179dSJan Kara dqput(dquot); 9016184fc0bSJan Kara dquot = ERR_PTR(err); 902884d179dSJan Kara goto out; 903884d179dSJan Kara } 9046184fc0bSJan Kara } 905044c9b67SJan Kara /* 906044c9b67SJan Kara * Make sure following reads see filled structure - paired with 907044c9b67SJan Kara * smp_mb__before_atomic() in dquot_acquire(). 908044c9b67SJan Kara */ 909044c9b67SJan Kara smp_rmb(); 91062af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 911884d179dSJan Kara BUG_ON(!dquot->dq_sb); /* Has somebody invalidated entry under us? */ 912884d179dSJan Kara #endif 913884d179dSJan Kara out: 914884d179dSJan Kara if (empty) 915884d179dSJan Kara do_destroy_dquot(empty); 916884d179dSJan Kara 917884d179dSJan Kara return dquot; 918884d179dSJan Kara } 919884d179dSJan Kara EXPORT_SYMBOL(dqget); 920884d179dSJan Kara 9212d0fa467SJan Kara static inline struct dquot **i_dquot(struct inode *inode) 9222d0fa467SJan Kara { 9232d0fa467SJan Kara return inode->i_sb->s_op->get_dquots(inode); 9242d0fa467SJan Kara } 9252d0fa467SJan Kara 926884d179dSJan Kara static int dqinit_needed(struct inode *inode, int type) 927884d179dSJan Kara { 9285bcd3b6fSKonstantin Khlebnikov struct dquot * const *dquots; 929884d179dSJan Kara int cnt; 930884d179dSJan Kara 931884d179dSJan Kara if (IS_NOQUOTA(inode)) 932884d179dSJan Kara return 0; 9335bcd3b6fSKonstantin Khlebnikov 9345bcd3b6fSKonstantin Khlebnikov dquots = i_dquot(inode); 935884d179dSJan Kara if (type != -1) 9365bcd3b6fSKonstantin Khlebnikov return !dquots[type]; 937884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 9385bcd3b6fSKonstantin Khlebnikov if (!dquots[cnt]) 939884d179dSJan Kara return 1; 940884d179dSJan Kara return 0; 941884d179dSJan Kara } 942884d179dSJan Kara 943c3b00446SJan Kara /* This routine is guarded by s_umount semaphore */ 9441a6152d3SChao Yu static int add_dquot_ref(struct super_block *sb, int type) 945884d179dSJan Kara { 946884d179dSJan Kara struct inode *inode, *old_inode = NULL; 94762af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 9480a5a9c72SJan Kara int reserved = 0; 9494c5e6c0eSJan Kara #endif 9501a6152d3SChao Yu int err = 0; 951884d179dSJan Kara 95274278da9SDave Chinner spin_lock(&sb->s_inode_list_lock); 953884d179dSJan Kara list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { 954250df6edSDave Chinner spin_lock(&inode->i_lock); 955250df6edSDave Chinner if ((inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW)) || 956250df6edSDave Chinner !atomic_read(&inode->i_writecount) || 957250df6edSDave Chinner !dqinit_needed(inode, type)) { 958250df6edSDave Chinner spin_unlock(&inode->i_lock); 9593ae5080fSLinus Torvalds continue; 960250df6edSDave Chinner } 961884d179dSJan Kara __iget(inode); 962250df6edSDave Chinner spin_unlock(&inode->i_lock); 96374278da9SDave Chinner spin_unlock(&sb->s_inode_list_lock); 964884d179dSJan Kara 965d7e97117SJan Kara #ifdef CONFIG_QUOTA_DEBUG 966d7e97117SJan Kara if (unlikely(inode_get_rsv_space(inode) > 0)) 967d7e97117SJan Kara reserved = 1; 968d7e97117SJan Kara #endif 969884d179dSJan Kara iput(old_inode); 9701a6152d3SChao Yu err = __dquot_initialize(inode, type); 9711a6152d3SChao Yu if (err) { 9721a6152d3SChao Yu iput(inode); 9731a6152d3SChao Yu goto out; 9741a6152d3SChao Yu } 97555fa6091SDave Chinner 97655fa6091SDave Chinner /* 97755fa6091SDave Chinner * We hold a reference to 'inode' so it couldn't have been 97855fa6091SDave Chinner * removed from s_inodes list while we dropped the 97974278da9SDave Chinner * s_inode_list_lock. We cannot iput the inode now as we can be 98055fa6091SDave Chinner * holding the last reference and we cannot iput it under 98174278da9SDave Chinner * s_inode_list_lock. So we keep the reference and iput it 98255fa6091SDave Chinner * later. 98355fa6091SDave Chinner */ 984884d179dSJan Kara old_inode = inode; 98574278da9SDave Chinner spin_lock(&sb->s_inode_list_lock); 986884d179dSJan Kara } 98774278da9SDave Chinner spin_unlock(&sb->s_inode_list_lock); 988884d179dSJan Kara iput(old_inode); 9891a6152d3SChao Yu out: 99062af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 9910a5a9c72SJan Kara if (reserved) { 992fb5ffb0eSJiaying Zhang quota_error(sb, "Writes happened before quota was turned on " 993fb5ffb0eSJiaying Zhang "thus quota information is probably inconsistent. " 994fb5ffb0eSJiaying Zhang "Please run quotacheck(8)"); 9950a5a9c72SJan Kara } 9964c5e6c0eSJan Kara #endif 9971a6152d3SChao Yu return err; 998884d179dSJan Kara } 999884d179dSJan Kara 1000268157baSJan Kara /* 1001268157baSJan Kara * Remove references to dquots from inode and add dquot to list for freeing 100225985edcSLucas De Marchi * if we have the last reference to dquot 1003268157baSJan Kara */ 10049eb6463fSNiu Yawei static void remove_inode_dquot_ref(struct inode *inode, int type, 1005884d179dSJan Kara struct list_head *tofree_head) 1006884d179dSJan Kara { 10075bcd3b6fSKonstantin Khlebnikov struct dquot **dquots = i_dquot(inode); 10085bcd3b6fSKonstantin Khlebnikov struct dquot *dquot = dquots[type]; 1009884d179dSJan Kara 10109eb6463fSNiu Yawei if (!dquot) 10119eb6463fSNiu Yawei return; 10129eb6463fSNiu Yawei 10135bcd3b6fSKonstantin Khlebnikov dquots[type] = NULL; 10149eb6463fSNiu Yawei if (list_empty(&dquot->dq_free)) { 10159eb6463fSNiu Yawei /* 10169eb6463fSNiu Yawei * The inode still has reference to dquot so it can't be in the 10179eb6463fSNiu Yawei * free list 10189eb6463fSNiu Yawei */ 1019884d179dSJan Kara spin_lock(&dq_list_lock); 1020268157baSJan Kara list_add(&dquot->dq_free, tofree_head); 1021884d179dSJan Kara spin_unlock(&dq_list_lock); 10229eb6463fSNiu Yawei } else { 10239eb6463fSNiu Yawei /* 10249eb6463fSNiu Yawei * Dquot is already in a list to put so we won't drop the last 10259eb6463fSNiu Yawei * reference here. 10269eb6463fSNiu Yawei */ 10279eb6463fSNiu Yawei dqput(dquot); 1028884d179dSJan Kara } 1029884d179dSJan Kara } 1030884d179dSJan Kara 1031268157baSJan Kara /* 1032268157baSJan Kara * Free list of dquots 1033268157baSJan Kara * Dquots are removed from inodes and no new references can be got so we are 1034268157baSJan Kara * the only ones holding reference 1035268157baSJan Kara */ 1036884d179dSJan Kara static void put_dquot_list(struct list_head *tofree_head) 1037884d179dSJan Kara { 1038884d179dSJan Kara struct list_head *act_head; 1039884d179dSJan Kara struct dquot *dquot; 1040884d179dSJan Kara 1041884d179dSJan Kara act_head = tofree_head->next; 1042884d179dSJan Kara while (act_head != tofree_head) { 1043884d179dSJan Kara dquot = list_entry(act_head, struct dquot, dq_free); 1044884d179dSJan Kara act_head = act_head->next; 1045268157baSJan Kara /* Remove dquot from the list so we won't have problems... */ 1046268157baSJan Kara list_del_init(&dquot->dq_free); 1047884d179dSJan Kara dqput(dquot); 1048884d179dSJan Kara } 1049884d179dSJan Kara } 1050884d179dSJan Kara 1051884d179dSJan Kara static void remove_dquot_ref(struct super_block *sb, int type, 1052884d179dSJan Kara struct list_head *tofree_head) 1053884d179dSJan Kara { 1054884d179dSJan Kara struct inode *inode; 10557af9cce8SDmitry Monakhov int reserved = 0; 1056884d179dSJan Kara 105774278da9SDave Chinner spin_lock(&sb->s_inode_list_lock); 1058884d179dSJan Kara list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { 10593ae5080fSLinus Torvalds /* 10603ae5080fSLinus Torvalds * We have to scan also I_NEW inodes because they can already 10613ae5080fSLinus Torvalds * have quota pointer initialized. Luckily, we need to touch 10623ae5080fSLinus Torvalds * only quota pointers and these have separate locking 1063b9ba6f94SNiu Yawei * (dq_data_lock). 10643ae5080fSLinus Torvalds */ 1065b9ba6f94SNiu Yawei spin_lock(&dq_data_lock); 10667af9cce8SDmitry Monakhov if (!IS_NOQUOTA(inode)) { 10677af9cce8SDmitry Monakhov if (unlikely(inode_get_rsv_space(inode) > 0)) 10687af9cce8SDmitry Monakhov reserved = 1; 1069884d179dSJan Kara remove_inode_dquot_ref(inode, type, tofree_head); 1070884d179dSJan Kara } 1071b9ba6f94SNiu Yawei spin_unlock(&dq_data_lock); 10727af9cce8SDmitry Monakhov } 107374278da9SDave Chinner spin_unlock(&sb->s_inode_list_lock); 10747af9cce8SDmitry Monakhov #ifdef CONFIG_QUOTA_DEBUG 10757af9cce8SDmitry Monakhov if (reserved) { 10767af9cce8SDmitry Monakhov printk(KERN_WARNING "VFS (%s): Writes happened after quota" 10777af9cce8SDmitry Monakhov " was disabled thus quota information is probably " 10787af9cce8SDmitry Monakhov "inconsistent. Please run quotacheck(8).\n", sb->s_id); 10797af9cce8SDmitry Monakhov } 10807af9cce8SDmitry Monakhov #endif 1081884d179dSJan Kara } 1082884d179dSJan Kara 1083884d179dSJan Kara /* Gather all references from inodes and drop them */ 1084884d179dSJan Kara static void drop_dquot_ref(struct super_block *sb, int type) 1085884d179dSJan Kara { 1086884d179dSJan Kara LIST_HEAD(tofree_head); 1087884d179dSJan Kara 1088884d179dSJan Kara if (sb->dq_op) { 1089884d179dSJan Kara remove_dquot_ref(sb, type, &tofree_head); 1090b9ba6f94SNiu Yawei synchronize_srcu(&dquot_srcu); 1091884d179dSJan Kara put_dquot_list(&tofree_head); 1092884d179dSJan Kara } 1093884d179dSJan Kara } 1094884d179dSJan Kara 1095884d179dSJan Kara static inline 1096884d179dSJan Kara void dquot_free_reserved_space(struct dquot *dquot, qsize_t number) 1097884d179dSJan Kara { 10980a5a9c72SJan Kara if (dquot->dq_dqb.dqb_rsvspace >= number) 1099884d179dSJan Kara dquot->dq_dqb.dqb_rsvspace -= number; 11000a5a9c72SJan Kara else { 11010a5a9c72SJan Kara WARN_ON_ONCE(1); 11020a5a9c72SJan Kara dquot->dq_dqb.dqb_rsvspace = 0; 11030a5a9c72SJan Kara } 110441e327b5Szhangyi (F) if (dquot->dq_dqb.dqb_curspace + dquot->dq_dqb.dqb_rsvspace <= 110541e327b5Szhangyi (F) dquot->dq_dqb.dqb_bsoftlimit) 110641e327b5Szhangyi (F) dquot->dq_dqb.dqb_btime = (time64_t) 0; 110741e327b5Szhangyi (F) clear_bit(DQ_BLKS_B, &dquot->dq_flags); 1108884d179dSJan Kara } 1109884d179dSJan Kara 11107a2435d8SJan Kara static void dquot_decr_inodes(struct dquot *dquot, qsize_t number) 1111884d179dSJan Kara { 1112884d179dSJan Kara if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE || 1113884d179dSJan Kara dquot->dq_dqb.dqb_curinodes >= number) 1114884d179dSJan Kara dquot->dq_dqb.dqb_curinodes -= number; 1115884d179dSJan Kara else 1116884d179dSJan Kara dquot->dq_dqb.dqb_curinodes = 0; 1117884d179dSJan Kara if (dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit) 1118e008bb61SArnd Bergmann dquot->dq_dqb.dqb_itime = (time64_t) 0; 1119884d179dSJan Kara clear_bit(DQ_INODES_B, &dquot->dq_flags); 1120884d179dSJan Kara } 1121884d179dSJan Kara 11227a2435d8SJan Kara static void dquot_decr_space(struct dquot *dquot, qsize_t number) 1123884d179dSJan Kara { 1124884d179dSJan Kara if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE || 1125884d179dSJan Kara dquot->dq_dqb.dqb_curspace >= number) 1126884d179dSJan Kara dquot->dq_dqb.dqb_curspace -= number; 1127884d179dSJan Kara else 1128884d179dSJan Kara dquot->dq_dqb.dqb_curspace = 0; 112941e327b5Szhangyi (F) if (dquot->dq_dqb.dqb_curspace + dquot->dq_dqb.dqb_rsvspace <= 113041e327b5Szhangyi (F) dquot->dq_dqb.dqb_bsoftlimit) 1131e008bb61SArnd Bergmann dquot->dq_dqb.dqb_btime = (time64_t) 0; 1132884d179dSJan Kara clear_bit(DQ_BLKS_B, &dquot->dq_flags); 1133884d179dSJan Kara } 1134884d179dSJan Kara 1135bf097aafSJan Kara struct dquot_warn { 1136bf097aafSJan Kara struct super_block *w_sb; 11377b9c7321SEric W. Biederman struct kqid w_dq_id; 1138bf097aafSJan Kara short w_type; 1139bf097aafSJan Kara }; 1140bf097aafSJan Kara 1141884d179dSJan Kara static int warning_issued(struct dquot *dquot, const int warntype) 1142884d179dSJan Kara { 1143884d179dSJan Kara int flag = (warntype == QUOTA_NL_BHARDWARN || 1144884d179dSJan Kara warntype == QUOTA_NL_BSOFTLONGWARN) ? DQ_BLKS_B : 1145884d179dSJan Kara ((warntype == QUOTA_NL_IHARDWARN || 1146884d179dSJan Kara warntype == QUOTA_NL_ISOFTLONGWARN) ? DQ_INODES_B : 0); 1147884d179dSJan Kara 1148884d179dSJan Kara if (!flag) 1149884d179dSJan Kara return 0; 1150884d179dSJan Kara return test_and_set_bit(flag, &dquot->dq_flags); 1151884d179dSJan Kara } 1152884d179dSJan Kara 1153884d179dSJan Kara #ifdef CONFIG_PRINT_QUOTA_WARNING 1154884d179dSJan Kara static int flag_print_warnings = 1; 1155884d179dSJan Kara 1156bf097aafSJan Kara static int need_print_warning(struct dquot_warn *warn) 1157884d179dSJan Kara { 1158884d179dSJan Kara if (!flag_print_warnings) 1159884d179dSJan Kara return 0; 1160884d179dSJan Kara 11617b9c7321SEric W. Biederman switch (warn->w_dq_id.type) { 1162884d179dSJan Kara case USRQUOTA: 11631a06d420SEric W. Biederman return uid_eq(current_fsuid(), warn->w_dq_id.uid); 1164884d179dSJan Kara case GRPQUOTA: 11657b9c7321SEric W. Biederman return in_group_p(warn->w_dq_id.gid); 1166847aac64SLi Xi case PRJQUOTA: 1167847aac64SLi Xi return 1; 1168884d179dSJan Kara } 1169884d179dSJan Kara return 0; 1170884d179dSJan Kara } 1171884d179dSJan Kara 1172884d179dSJan Kara /* Print warning to user which exceeded quota */ 1173bf097aafSJan Kara static void print_warning(struct dquot_warn *warn) 1174884d179dSJan Kara { 1175884d179dSJan Kara char *msg = NULL; 1176884d179dSJan Kara struct tty_struct *tty; 1177bf097aafSJan Kara int warntype = warn->w_type; 1178884d179dSJan Kara 1179884d179dSJan Kara if (warntype == QUOTA_NL_IHARDBELOW || 1180884d179dSJan Kara warntype == QUOTA_NL_ISOFTBELOW || 1181884d179dSJan Kara warntype == QUOTA_NL_BHARDBELOW || 1182bf097aafSJan Kara warntype == QUOTA_NL_BSOFTBELOW || !need_print_warning(warn)) 1183884d179dSJan Kara return; 1184884d179dSJan Kara 1185884d179dSJan Kara tty = get_current_tty(); 1186884d179dSJan Kara if (!tty) 1187884d179dSJan Kara return; 1188bf097aafSJan Kara tty_write_message(tty, warn->w_sb->s_id); 1189884d179dSJan Kara if (warntype == QUOTA_NL_ISOFTWARN || warntype == QUOTA_NL_BSOFTWARN) 1190884d179dSJan Kara tty_write_message(tty, ": warning, "); 1191884d179dSJan Kara else 1192884d179dSJan Kara tty_write_message(tty, ": write failed, "); 11937b9c7321SEric W. Biederman tty_write_message(tty, quotatypes[warn->w_dq_id.type]); 1194884d179dSJan Kara switch (warntype) { 1195884d179dSJan Kara case QUOTA_NL_IHARDWARN: 1196884d179dSJan Kara msg = " file limit reached.\r\n"; 1197884d179dSJan Kara break; 1198884d179dSJan Kara case QUOTA_NL_ISOFTLONGWARN: 1199884d179dSJan Kara msg = " file quota exceeded too long.\r\n"; 1200884d179dSJan Kara break; 1201884d179dSJan Kara case QUOTA_NL_ISOFTWARN: 1202884d179dSJan Kara msg = " file quota exceeded.\r\n"; 1203884d179dSJan Kara break; 1204884d179dSJan Kara case QUOTA_NL_BHARDWARN: 1205884d179dSJan Kara msg = " block limit reached.\r\n"; 1206884d179dSJan Kara break; 1207884d179dSJan Kara case QUOTA_NL_BSOFTLONGWARN: 1208884d179dSJan Kara msg = " block quota exceeded too long.\r\n"; 1209884d179dSJan Kara break; 1210884d179dSJan Kara case QUOTA_NL_BSOFTWARN: 1211884d179dSJan Kara msg = " block quota exceeded.\r\n"; 1212884d179dSJan Kara break; 1213884d179dSJan Kara } 1214884d179dSJan Kara tty_write_message(tty, msg); 1215884d179dSJan Kara tty_kref_put(tty); 1216884d179dSJan Kara } 1217884d179dSJan Kara #endif 1218884d179dSJan Kara 1219bf097aafSJan Kara static void prepare_warning(struct dquot_warn *warn, struct dquot *dquot, 1220bf097aafSJan Kara int warntype) 1221bf097aafSJan Kara { 1222bf097aafSJan Kara if (warning_issued(dquot, warntype)) 1223bf097aafSJan Kara return; 1224bf097aafSJan Kara warn->w_type = warntype; 1225bf097aafSJan Kara warn->w_sb = dquot->dq_sb; 1226bf097aafSJan Kara warn->w_dq_id = dquot->dq_id; 1227bf097aafSJan Kara } 1228bf097aafSJan Kara 1229884d179dSJan Kara /* 1230884d179dSJan Kara * Write warnings to the console and send warning messages over netlink. 1231884d179dSJan Kara * 1232bf097aafSJan Kara * Note that this function can call into tty and networking code. 1233884d179dSJan Kara */ 1234bf097aafSJan Kara static void flush_warnings(struct dquot_warn *warn) 1235884d179dSJan Kara { 1236884d179dSJan Kara int i; 1237884d179dSJan Kara 123886e931a3SSteven Whitehouse for (i = 0; i < MAXQUOTAS; i++) { 1239bf097aafSJan Kara if (warn[i].w_type == QUOTA_NL_NOWARN) 1240bf097aafSJan Kara continue; 1241884d179dSJan Kara #ifdef CONFIG_PRINT_QUOTA_WARNING 1242bf097aafSJan Kara print_warning(&warn[i]); 1243884d179dSJan Kara #endif 12447b9c7321SEric W. Biederman quota_send_warning(warn[i].w_dq_id, 1245bf097aafSJan Kara warn[i].w_sb->s_dev, warn[i].w_type); 1246884d179dSJan Kara } 1247884d179dSJan Kara } 1248884d179dSJan Kara 12497a2435d8SJan Kara static int ignore_hardlimit(struct dquot *dquot) 1250884d179dSJan Kara { 12514c376dcaSEric W. Biederman struct mem_dqinfo *info = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_id.type]; 1252884d179dSJan Kara 1253884d179dSJan Kara return capable(CAP_SYS_RESOURCE) && 1254268157baSJan Kara (info->dqi_format->qf_fmt_id != QFMT_VFS_OLD || 12559c45101eSJan Kara !(info->dqi_flags & DQF_ROOT_SQUASH)); 1256884d179dSJan Kara } 1257884d179dSJan Kara 12587b9ca4c6SJan Kara static int dquot_add_inodes(struct dquot *dquot, qsize_t inodes, 1259bf097aafSJan Kara struct dquot_warn *warn) 1260884d179dSJan Kara { 12617b9ca4c6SJan Kara qsize_t newinodes; 12627b9ca4c6SJan Kara int ret = 0; 1263268157baSJan Kara 12647b9ca4c6SJan Kara spin_lock(&dquot->dq_dqb_lock); 12657b9ca4c6SJan Kara newinodes = dquot->dq_dqb.dqb_curinodes + inodes; 12664c376dcaSEric W. Biederman if (!sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_id.type) || 1267884d179dSJan Kara test_bit(DQ_FAKE_B, &dquot->dq_flags)) 12687b9ca4c6SJan Kara goto add; 1269884d179dSJan Kara 1270884d179dSJan Kara if (dquot->dq_dqb.dqb_ihardlimit && 1271268157baSJan Kara newinodes > dquot->dq_dqb.dqb_ihardlimit && 1272884d179dSJan Kara !ignore_hardlimit(dquot)) { 1273bf097aafSJan Kara prepare_warning(warn, dquot, QUOTA_NL_IHARDWARN); 12747b9ca4c6SJan Kara ret = -EDQUOT; 12757b9ca4c6SJan Kara goto out; 1276884d179dSJan Kara } 1277884d179dSJan Kara 1278884d179dSJan Kara if (dquot->dq_dqb.dqb_isoftlimit && 1279268157baSJan Kara newinodes > dquot->dq_dqb.dqb_isoftlimit && 1280268157baSJan Kara dquot->dq_dqb.dqb_itime && 1281e008bb61SArnd Bergmann ktime_get_real_seconds() >= dquot->dq_dqb.dqb_itime && 1282884d179dSJan Kara !ignore_hardlimit(dquot)) { 1283bf097aafSJan Kara prepare_warning(warn, dquot, QUOTA_NL_ISOFTLONGWARN); 12847b9ca4c6SJan Kara ret = -EDQUOT; 12857b9ca4c6SJan Kara goto out; 1286884d179dSJan Kara } 1287884d179dSJan Kara 1288884d179dSJan Kara if (dquot->dq_dqb.dqb_isoftlimit && 1289268157baSJan Kara newinodes > dquot->dq_dqb.dqb_isoftlimit && 1290884d179dSJan Kara dquot->dq_dqb.dqb_itime == 0) { 1291bf097aafSJan Kara prepare_warning(warn, dquot, QUOTA_NL_ISOFTWARN); 1292e008bb61SArnd Bergmann dquot->dq_dqb.dqb_itime = ktime_get_real_seconds() + 12934c376dcaSEric W. Biederman sb_dqopt(dquot->dq_sb)->info[dquot->dq_id.type].dqi_igrace; 1294884d179dSJan Kara } 12957b9ca4c6SJan Kara add: 12967b9ca4c6SJan Kara dquot->dq_dqb.dqb_curinodes = newinodes; 1297884d179dSJan Kara 12987b9ca4c6SJan Kara out: 12997b9ca4c6SJan Kara spin_unlock(&dquot->dq_dqb_lock); 13007b9ca4c6SJan Kara return ret; 1301884d179dSJan Kara } 1302884d179dSJan Kara 13037b9ca4c6SJan Kara static int dquot_add_space(struct dquot *dquot, qsize_t space, 13047b9ca4c6SJan Kara qsize_t rsv_space, unsigned int flags, 1305bf097aafSJan Kara struct dquot_warn *warn) 1306884d179dSJan Kara { 1307884d179dSJan Kara qsize_t tspace; 1308268157baSJan Kara struct super_block *sb = dquot->dq_sb; 13097b9ca4c6SJan Kara int ret = 0; 1310884d179dSJan Kara 13117b9ca4c6SJan Kara spin_lock(&dquot->dq_dqb_lock); 13124c376dcaSEric W. Biederman if (!sb_has_quota_limits_enabled(sb, dquot->dq_id.type) || 1313884d179dSJan Kara test_bit(DQ_FAKE_B, &dquot->dq_flags)) 1314ac3d7939SJan Kara goto finish; 1315884d179dSJan Kara 1316884d179dSJan Kara tspace = dquot->dq_dqb.dqb_curspace + dquot->dq_dqb.dqb_rsvspace 13177b9ca4c6SJan Kara + space + rsv_space; 13187b9ca4c6SJan Kara 1319884d179dSJan Kara if (dquot->dq_dqb.dqb_bhardlimit && 1320884d179dSJan Kara tspace > dquot->dq_dqb.dqb_bhardlimit && 1321884d179dSJan Kara !ignore_hardlimit(dquot)) { 13227b9ca4c6SJan Kara if (flags & DQUOT_SPACE_WARN) 1323bf097aafSJan Kara prepare_warning(warn, dquot, QUOTA_NL_BHARDWARN); 13247b9ca4c6SJan Kara ret = -EDQUOT; 1325ac3d7939SJan Kara goto finish; 1326884d179dSJan Kara } 1327884d179dSJan Kara 1328884d179dSJan Kara if (dquot->dq_dqb.dqb_bsoftlimit && 1329884d179dSJan Kara tspace > dquot->dq_dqb.dqb_bsoftlimit && 1330268157baSJan Kara dquot->dq_dqb.dqb_btime && 1331e008bb61SArnd Bergmann ktime_get_real_seconds() >= dquot->dq_dqb.dqb_btime && 1332884d179dSJan Kara !ignore_hardlimit(dquot)) { 13337b9ca4c6SJan Kara if (flags & DQUOT_SPACE_WARN) 1334bf097aafSJan Kara prepare_warning(warn, dquot, QUOTA_NL_BSOFTLONGWARN); 13357b9ca4c6SJan Kara ret = -EDQUOT; 1336ac3d7939SJan Kara goto finish; 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) { 13427b9ca4c6SJan Kara if (flags & DQUOT_SPACE_WARN) { 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; 13467b9ca4c6SJan Kara } else { 1347884d179dSJan Kara /* 1348884d179dSJan Kara * We don't allow preallocation to exceed softlimit so exceeding will 1349884d179dSJan Kara * be always printed 1350884d179dSJan Kara */ 13517b9ca4c6SJan Kara ret = -EDQUOT; 1352ac3d7939SJan Kara goto finish; 1353884d179dSJan Kara } 13547b9ca4c6SJan Kara } 1355ac3d7939SJan Kara finish: 1356ac3d7939SJan Kara /* 1357ac3d7939SJan Kara * We have to be careful and go through warning generation & grace time 1358ac3d7939SJan Kara * setting even if DQUOT_SPACE_NOFAIL is set. That's why we check it 1359ac3d7939SJan Kara * only here... 1360ac3d7939SJan Kara */ 1361ac3d7939SJan Kara if (flags & DQUOT_SPACE_NOFAIL) 1362ac3d7939SJan Kara ret = 0; 1363ac3d7939SJan Kara if (!ret) { 13647b9ca4c6SJan Kara dquot->dq_dqb.dqb_rsvspace += rsv_space; 13657b9ca4c6SJan Kara dquot->dq_dqb.dqb_curspace += space; 1366ac3d7939SJan Kara } 13677b9ca4c6SJan Kara spin_unlock(&dquot->dq_dqb_lock); 13687b9ca4c6SJan Kara return ret; 1369884d179dSJan Kara } 1370884d179dSJan Kara 1371884d179dSJan Kara static int info_idq_free(struct dquot *dquot, qsize_t inodes) 1372884d179dSJan Kara { 1373268157baSJan Kara qsize_t newinodes; 1374268157baSJan Kara 1375884d179dSJan Kara if (test_bit(DQ_FAKE_B, &dquot->dq_flags) || 1376884d179dSJan Kara dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit || 13774c376dcaSEric W. Biederman !sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_id.type)) 1378884d179dSJan Kara return QUOTA_NL_NOWARN; 1379884d179dSJan Kara 1380268157baSJan Kara newinodes = dquot->dq_dqb.dqb_curinodes - inodes; 1381268157baSJan Kara if (newinodes <= dquot->dq_dqb.dqb_isoftlimit) 1382884d179dSJan Kara return QUOTA_NL_ISOFTBELOW; 1383884d179dSJan Kara if (dquot->dq_dqb.dqb_curinodes >= dquot->dq_dqb.dqb_ihardlimit && 1384268157baSJan Kara newinodes < dquot->dq_dqb.dqb_ihardlimit) 1385884d179dSJan Kara return QUOTA_NL_IHARDBELOW; 1386884d179dSJan Kara return QUOTA_NL_NOWARN; 1387884d179dSJan Kara } 1388884d179dSJan Kara 1389884d179dSJan Kara static int info_bdq_free(struct dquot *dquot, qsize_t space) 1390884d179dSJan Kara { 139141e327b5Szhangyi (F) qsize_t tspace; 139241e327b5Szhangyi (F) 139341e327b5Szhangyi (F) tspace = dquot->dq_dqb.dqb_curspace + dquot->dq_dqb.dqb_rsvspace; 139441e327b5Szhangyi (F) 1395884d179dSJan Kara if (test_bit(DQ_FAKE_B, &dquot->dq_flags) || 139641e327b5Szhangyi (F) tspace <= dquot->dq_dqb.dqb_bsoftlimit) 1397884d179dSJan Kara return QUOTA_NL_NOWARN; 1398884d179dSJan Kara 139941e327b5Szhangyi (F) if (tspace - space <= dquot->dq_dqb.dqb_bsoftlimit) 1400884d179dSJan Kara return QUOTA_NL_BSOFTBELOW; 140141e327b5Szhangyi (F) if (tspace >= dquot->dq_dqb.dqb_bhardlimit && 140241e327b5Szhangyi (F) tspace - space < dquot->dq_dqb.dqb_bhardlimit) 1403884d179dSJan Kara return QUOTA_NL_BHARDBELOW; 1404884d179dSJan Kara return QUOTA_NL_NOWARN; 1405884d179dSJan Kara } 14060a5a9c72SJan Kara 1407189eef59SChristoph Hellwig static int dquot_active(const struct inode *inode) 1408189eef59SChristoph Hellwig { 1409189eef59SChristoph Hellwig struct super_block *sb = inode->i_sb; 1410189eef59SChristoph Hellwig 1411189eef59SChristoph Hellwig if (IS_NOQUOTA(inode)) 1412189eef59SChristoph Hellwig return 0; 1413189eef59SChristoph Hellwig return sb_any_quota_loaded(sb) & ~sb_any_quota_suspended(sb); 1414189eef59SChristoph Hellwig } 1415189eef59SChristoph Hellwig 1416884d179dSJan Kara /* 1417884d179dSJan Kara * Initialize quota pointers in inode 1418871a2931SChristoph Hellwig * 1419871a2931SChristoph Hellwig * It is better to call this function outside of any transaction as it 1420871a2931SChristoph Hellwig * might need a lot of space in journal for dquot structure allocation. 1421884d179dSJan Kara */ 14226184fc0bSJan Kara static int __dquot_initialize(struct inode *inode, int type) 1423884d179dSJan Kara { 14241ea06becSNiu Yawei int cnt, init_needed = 0; 1425ab73ef46SNikolay Borisov struct dquot **dquots, *got[MAXQUOTAS] = {}; 1426884d179dSJan Kara struct super_block *sb = inode->i_sb; 14270a5a9c72SJan Kara qsize_t rsv; 14286184fc0bSJan Kara int ret = 0; 1429884d179dSJan Kara 1430189eef59SChristoph Hellwig if (!dquot_active(inode)) 14316184fc0bSJan Kara return 0; 1432884d179dSJan Kara 14335bcd3b6fSKonstantin Khlebnikov dquots = i_dquot(inode); 14345bcd3b6fSKonstantin Khlebnikov 1435884d179dSJan Kara /* First get references to structures we might need. */ 1436884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1437aca645a6SEric W. Biederman struct kqid qid; 1438847aac64SLi Xi kprojid_t projid; 1439847aac64SLi Xi int rc; 14406184fc0bSJan Kara struct dquot *dquot; 1441847aac64SLi Xi 1442884d179dSJan Kara if (type != -1 && cnt != type) 1443884d179dSJan Kara continue; 14441ea06becSNiu Yawei /* 14451ea06becSNiu Yawei * The i_dquot should have been initialized in most cases, 14461ea06becSNiu Yawei * we check it without locking here to avoid unnecessary 14471ea06becSNiu Yawei * dqget()/dqput() calls. 14481ea06becSNiu Yawei */ 14495bcd3b6fSKonstantin Khlebnikov if (dquots[cnt]) 14501ea06becSNiu Yawei continue; 1451847aac64SLi Xi 1452847aac64SLi Xi if (!sb_has_quota_active(sb, cnt)) 1453847aac64SLi Xi continue; 1454847aac64SLi Xi 14551ea06becSNiu Yawei init_needed = 1; 14561ea06becSNiu Yawei 1457884d179dSJan Kara switch (cnt) { 1458884d179dSJan Kara case USRQUOTA: 1459aca645a6SEric W. Biederman qid = make_kqid_uid(inode->i_uid); 1460884d179dSJan Kara break; 1461884d179dSJan Kara case GRPQUOTA: 1462aca645a6SEric W. Biederman qid = make_kqid_gid(inode->i_gid); 1463884d179dSJan Kara break; 1464847aac64SLi Xi case PRJQUOTA: 1465847aac64SLi Xi rc = inode->i_sb->dq_op->get_projid(inode, &projid); 1466847aac64SLi Xi if (rc) 1467847aac64SLi Xi continue; 1468847aac64SLi Xi qid = make_kqid_projid(projid); 1469847aac64SLi Xi break; 1470884d179dSJan Kara } 14716184fc0bSJan Kara dquot = dqget(sb, qid); 14726184fc0bSJan Kara if (IS_ERR(dquot)) { 14736184fc0bSJan Kara /* We raced with somebody turning quotas off... */ 14746184fc0bSJan Kara if (PTR_ERR(dquot) != -ESRCH) { 14756184fc0bSJan Kara ret = PTR_ERR(dquot); 14766184fc0bSJan Kara goto out_put; 14776184fc0bSJan Kara } 14786184fc0bSJan Kara dquot = NULL; 14796184fc0bSJan Kara } 14806184fc0bSJan Kara got[cnt] = dquot; 1481884d179dSJan Kara } 1482884d179dSJan Kara 14831ea06becSNiu Yawei /* All required i_dquot has been initialized */ 14841ea06becSNiu Yawei if (!init_needed) 14856184fc0bSJan Kara return 0; 14861ea06becSNiu Yawei 1487b9ba6f94SNiu Yawei spin_lock(&dq_data_lock); 1488884d179dSJan Kara if (IS_NOQUOTA(inode)) 14896184fc0bSJan Kara goto out_lock; 1490884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1491884d179dSJan Kara if (type != -1 && cnt != type) 1492884d179dSJan Kara continue; 1493884d179dSJan Kara /* Avoid races with quotaoff() */ 1494884d179dSJan Kara if (!sb_has_quota_active(sb, cnt)) 1495884d179dSJan Kara continue; 14964408ea41SJan Kara /* We could race with quotaon or dqget() could have failed */ 14974408ea41SJan Kara if (!got[cnt]) 14984408ea41SJan Kara continue; 14995bcd3b6fSKonstantin Khlebnikov if (!dquots[cnt]) { 15005bcd3b6fSKonstantin Khlebnikov dquots[cnt] = got[cnt]; 1501dd6f3c6dSJan Kara got[cnt] = NULL; 15020a5a9c72SJan Kara /* 15030a5a9c72SJan Kara * Make quota reservation system happy if someone 15040a5a9c72SJan Kara * did a write before quota was turned on 15050a5a9c72SJan Kara */ 15060a5a9c72SJan Kara rsv = inode_get_rsv_space(inode); 15077b9ca4c6SJan Kara if (unlikely(rsv)) { 15087b9ca4c6SJan Kara spin_lock(&inode->i_lock); 15097b9ca4c6SJan Kara /* Get reservation again under proper lock */ 15107b9ca4c6SJan Kara rsv = __inode_get_rsv_space(inode); 15117b9ca4c6SJan Kara spin_lock(&dquots[cnt]->dq_dqb_lock); 15127b9ca4c6SJan Kara dquots[cnt]->dq_dqb.dqb_rsvspace += rsv; 15137b9ca4c6SJan Kara spin_unlock(&dquots[cnt]->dq_dqb_lock); 15147b9ca4c6SJan Kara spin_unlock(&inode->i_lock); 15157b9ca4c6SJan Kara } 1516884d179dSJan Kara } 1517884d179dSJan Kara } 15186184fc0bSJan Kara out_lock: 1519b9ba6f94SNiu Yawei spin_unlock(&dq_data_lock); 15206184fc0bSJan Kara out_put: 1521884d179dSJan Kara /* Drop unused references */ 1522dc52dd3aSDmitry Monakhov dqput_all(got); 15236184fc0bSJan Kara 15246184fc0bSJan Kara return ret; 1525871a2931SChristoph Hellwig } 1526871a2931SChristoph Hellwig 15276184fc0bSJan Kara int dquot_initialize(struct inode *inode) 1528871a2931SChristoph Hellwig { 15296184fc0bSJan Kara return __dquot_initialize(inode, -1); 1530884d179dSJan Kara } 1531884d179dSJan Kara EXPORT_SYMBOL(dquot_initialize); 1532884d179dSJan Kara 1533b8cb5a54STahsin Erdogan bool dquot_initialize_needed(struct inode *inode) 1534b8cb5a54STahsin Erdogan { 1535b8cb5a54STahsin Erdogan struct dquot **dquots; 1536b8cb5a54STahsin Erdogan int i; 1537b8cb5a54STahsin Erdogan 1538b8cb5a54STahsin Erdogan if (!dquot_active(inode)) 1539b8cb5a54STahsin Erdogan return false; 1540b8cb5a54STahsin Erdogan 1541b8cb5a54STahsin Erdogan dquots = i_dquot(inode); 1542b8cb5a54STahsin Erdogan for (i = 0; i < MAXQUOTAS; i++) 1543b8cb5a54STahsin Erdogan if (!dquots[i] && sb_has_quota_active(inode->i_sb, i)) 1544b8cb5a54STahsin Erdogan return true; 1545b8cb5a54STahsin Erdogan return false; 1546b8cb5a54STahsin Erdogan } 1547b8cb5a54STahsin Erdogan EXPORT_SYMBOL(dquot_initialize_needed); 1548b8cb5a54STahsin Erdogan 1549884d179dSJan Kara /* 1550b9ba6f94SNiu Yawei * Release all quotas referenced by inode. 1551b9ba6f94SNiu Yawei * 1552b9ba6f94SNiu Yawei * This function only be called on inode free or converting 1553b9ba6f94SNiu Yawei * a file to quota file, no other users for the i_dquot in 1554b9ba6f94SNiu Yawei * both cases, so we needn't call synchronize_srcu() after 1555b9ba6f94SNiu Yawei * clearing i_dquot. 1556884d179dSJan Kara */ 15579f754758SChristoph Hellwig static void __dquot_drop(struct inode *inode) 1558884d179dSJan Kara { 1559884d179dSJan Kara int cnt; 15605bcd3b6fSKonstantin Khlebnikov struct dquot **dquots = i_dquot(inode); 1561884d179dSJan Kara struct dquot *put[MAXQUOTAS]; 1562884d179dSJan Kara 1563b9ba6f94SNiu Yawei spin_lock(&dq_data_lock); 1564884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 15655bcd3b6fSKonstantin Khlebnikov put[cnt] = dquots[cnt]; 15665bcd3b6fSKonstantin Khlebnikov dquots[cnt] = NULL; 1567884d179dSJan Kara } 1568b9ba6f94SNiu Yawei spin_unlock(&dq_data_lock); 1569dc52dd3aSDmitry Monakhov dqput_all(put); 1570884d179dSJan Kara } 1571884d179dSJan Kara 15729f754758SChristoph Hellwig void dquot_drop(struct inode *inode) 1573884d179dSJan Kara { 15745bcd3b6fSKonstantin Khlebnikov struct dquot * const *dquots; 1575884d179dSJan Kara int cnt; 15769f754758SChristoph Hellwig 15779f754758SChristoph Hellwig if (IS_NOQUOTA(inode)) 15789f754758SChristoph Hellwig return; 15799f754758SChristoph Hellwig 15809f754758SChristoph Hellwig /* 15819f754758SChristoph Hellwig * Test before calling to rule out calls from proc and such 1582884d179dSJan Kara * where we are not allowed to block. Note that this is 1583884d179dSJan Kara * actually reliable test even without the lock - the caller 1584884d179dSJan Kara * must assure that nobody can come after the DQUOT_DROP and 15859f754758SChristoph Hellwig * add quota pointers back anyway. 15869f754758SChristoph Hellwig */ 15875bcd3b6fSKonstantin Khlebnikov dquots = i_dquot(inode); 15889f754758SChristoph Hellwig for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 15895bcd3b6fSKonstantin Khlebnikov if (dquots[cnt]) 1590884d179dSJan Kara break; 15919f754758SChristoph Hellwig } 15929f754758SChristoph Hellwig 1593884d179dSJan Kara if (cnt < MAXQUOTAS) 15949f754758SChristoph Hellwig __dquot_drop(inode); 1595884d179dSJan Kara } 15969f754758SChristoph Hellwig EXPORT_SYMBOL(dquot_drop); 1597884d179dSJan Kara 1598884d179dSJan Kara /* 1599fd8fbfc1SDmitry Monakhov * inode_reserved_space is managed internally by quota, and protected by 1600fd8fbfc1SDmitry Monakhov * i_lock similar to i_blocks+i_bytes. 1601fd8fbfc1SDmitry Monakhov */ 1602fd8fbfc1SDmitry Monakhov static qsize_t *inode_reserved_space(struct inode * inode) 1603fd8fbfc1SDmitry Monakhov { 1604fd8fbfc1SDmitry Monakhov /* Filesystem must explicitly define it's own method in order to use 1605fd8fbfc1SDmitry Monakhov * quota reservation interface */ 1606fd8fbfc1SDmitry Monakhov BUG_ON(!inode->i_sb->dq_op->get_reserved_space); 1607fd8fbfc1SDmitry Monakhov return inode->i_sb->dq_op->get_reserved_space(inode); 1608fd8fbfc1SDmitry Monakhov } 1609fd8fbfc1SDmitry Monakhov 16107b9ca4c6SJan Kara static qsize_t __inode_get_rsv_space(struct inode *inode) 1611fd8fbfc1SDmitry Monakhov { 16127b9ca4c6SJan Kara if (!inode->i_sb->dq_op->get_reserved_space) 16137b9ca4c6SJan Kara return 0; 16147b9ca4c6SJan Kara return *inode_reserved_space(inode); 1615fd8fbfc1SDmitry Monakhov } 1616fd8fbfc1SDmitry Monakhov 1617fd8fbfc1SDmitry Monakhov static qsize_t inode_get_rsv_space(struct inode *inode) 1618fd8fbfc1SDmitry Monakhov { 1619fd8fbfc1SDmitry Monakhov qsize_t ret; 162005b5d898SJan Kara 162105b5d898SJan Kara if (!inode->i_sb->dq_op->get_reserved_space) 162205b5d898SJan Kara return 0; 1623fd8fbfc1SDmitry Monakhov spin_lock(&inode->i_lock); 16247b9ca4c6SJan Kara ret = __inode_get_rsv_space(inode); 1625fd8fbfc1SDmitry Monakhov spin_unlock(&inode->i_lock); 1626fd8fbfc1SDmitry Monakhov return ret; 1627fd8fbfc1SDmitry Monakhov } 1628fd8fbfc1SDmitry Monakhov 1629fd8fbfc1SDmitry Monakhov /* 16305dd4056dSChristoph Hellwig * This functions updates i_blocks+i_bytes fields and quota information 16315dd4056dSChristoph Hellwig * (together with appropriate checks). 16325dd4056dSChristoph Hellwig * 16335dd4056dSChristoph Hellwig * NOTE: We absolutely rely on the fact that caller dirties the inode 16345dd4056dSChristoph Hellwig * (usually helpers in quotaops.h care about this) and holds a handle for 16355dd4056dSChristoph Hellwig * the current transaction so that dquot write and inode write go into the 16365dd4056dSChristoph Hellwig * same transaction. 1637884d179dSJan Kara */ 1638884d179dSJan Kara 1639884d179dSJan Kara /* 1640884d179dSJan Kara * This operation can block, but only after everything is updated 1641884d179dSJan Kara */ 164256246f9aSEric Sandeen int __dquot_alloc_space(struct inode *inode, qsize_t number, int flags) 1643884d179dSJan Kara { 1644b9ba6f94SNiu Yawei int cnt, ret = 0, index; 1645bf097aafSJan Kara struct dquot_warn warn[MAXQUOTAS]; 164656246f9aSEric Sandeen int reserve = flags & DQUOT_SPACE_RESERVE; 16475bcd3b6fSKonstantin Khlebnikov struct dquot **dquots; 1648884d179dSJan Kara 1649189eef59SChristoph Hellwig if (!dquot_active(inode)) { 1650a478e522SJan Kara if (reserve) { 1651a478e522SJan Kara spin_lock(&inode->i_lock); 1652a478e522SJan Kara *inode_reserved_space(inode) += number; 1653a478e522SJan Kara spin_unlock(&inode->i_lock); 1654a478e522SJan Kara } else { 1655a478e522SJan Kara inode_add_bytes(inode, number); 1656a478e522SJan Kara } 1657fd8fbfc1SDmitry Monakhov goto out; 1658fd8fbfc1SDmitry Monakhov } 1659fd8fbfc1SDmitry Monakhov 1660884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 1661bf097aafSJan Kara warn[cnt].w_type = QUOTA_NL_NOWARN; 1662884d179dSJan Kara 16635bcd3b6fSKonstantin Khlebnikov dquots = i_dquot(inode); 1664b9ba6f94SNiu Yawei index = srcu_read_lock(&dquot_srcu); 16657b9ca4c6SJan Kara spin_lock(&inode->i_lock); 1666884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1667bf097aafSJan Kara if (!dquots[cnt]) 1668884d179dSJan Kara continue; 16697b9ca4c6SJan Kara if (flags & DQUOT_SPACE_RESERVE) { 16707b9ca4c6SJan Kara ret = dquot_add_space(dquots[cnt], 0, number, flags, 16717b9ca4c6SJan Kara &warn[cnt]); 16727b9ca4c6SJan Kara } else { 16737b9ca4c6SJan Kara ret = dquot_add_space(dquots[cnt], number, 0, flags, 16747b9ca4c6SJan Kara &warn[cnt]); 16757b9ca4c6SJan Kara } 16767b9ca4c6SJan Kara if (ret) { 16777b9ca4c6SJan Kara /* Back out changes we already did */ 16787b9ca4c6SJan Kara for (cnt--; cnt >= 0; cnt--) { 16797b9ca4c6SJan Kara if (!dquots[cnt]) 16807b9ca4c6SJan Kara continue; 16817b9ca4c6SJan Kara spin_lock(&dquots[cnt]->dq_dqb_lock); 16827b9ca4c6SJan Kara if (flags & DQUOT_SPACE_RESERVE) { 16837b9ca4c6SJan Kara dquots[cnt]->dq_dqb.dqb_rsvspace -= 16847b9ca4c6SJan Kara number; 16857b9ca4c6SJan Kara } else { 16867b9ca4c6SJan Kara dquots[cnt]->dq_dqb.dqb_curspace -= 16877b9ca4c6SJan Kara number; 16887b9ca4c6SJan Kara } 16897b9ca4c6SJan Kara spin_unlock(&dquots[cnt]->dq_dqb_lock); 16907b9ca4c6SJan Kara } 16917b9ca4c6SJan Kara spin_unlock(&inode->i_lock); 1692fd8fbfc1SDmitry Monakhov goto out_flush_warn; 1693884d179dSJan Kara } 1694884d179dSJan Kara } 1695884d179dSJan Kara if (reserve) 1696a478e522SJan Kara *inode_reserved_space(inode) += number; 1697884d179dSJan Kara else 16987b9ca4c6SJan Kara __inode_add_bytes(inode, number); 1699a478e522SJan Kara spin_unlock(&inode->i_lock); 1700fd8fbfc1SDmitry Monakhov 1701fd8fbfc1SDmitry Monakhov if (reserve) 1702fd8fbfc1SDmitry Monakhov goto out_flush_warn; 1703bf097aafSJan Kara mark_all_dquot_dirty(dquots); 1704fd8fbfc1SDmitry Monakhov out_flush_warn: 1705b9ba6f94SNiu Yawei srcu_read_unlock(&dquot_srcu, index); 1706bf097aafSJan Kara flush_warnings(warn); 1707fd8fbfc1SDmitry Monakhov out: 1708884d179dSJan Kara return ret; 1709884d179dSJan Kara } 17105dd4056dSChristoph Hellwig EXPORT_SYMBOL(__dquot_alloc_space); 1711884d179dSJan Kara 1712884d179dSJan Kara /* 1713884d179dSJan Kara * This operation can block, but only after everything is updated 1714884d179dSJan Kara */ 17156bab3596SJan Kara int dquot_alloc_inode(struct inode *inode) 1716884d179dSJan Kara { 1717b9ba6f94SNiu Yawei int cnt, ret = 0, index; 1718bf097aafSJan Kara struct dquot_warn warn[MAXQUOTAS]; 17195bcd3b6fSKonstantin Khlebnikov struct dquot * const *dquots; 1720884d179dSJan Kara 1721189eef59SChristoph Hellwig if (!dquot_active(inode)) 172263936ddaSChristoph Hellwig return 0; 1723884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 1724bf097aafSJan Kara warn[cnt].w_type = QUOTA_NL_NOWARN; 1725b9ba6f94SNiu Yawei 17265bcd3b6fSKonstantin Khlebnikov dquots = i_dquot(inode); 1727b9ba6f94SNiu Yawei index = srcu_read_lock(&dquot_srcu); 17287b9ca4c6SJan Kara spin_lock(&inode->i_lock); 1729884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1730bf097aafSJan Kara if (!dquots[cnt]) 1731884d179dSJan Kara continue; 17327b9ca4c6SJan Kara ret = dquot_add_inodes(dquots[cnt], 1, &warn[cnt]); 17337b9ca4c6SJan Kara if (ret) { 17347b9ca4c6SJan Kara for (cnt--; cnt >= 0; cnt--) { 17357b9ca4c6SJan Kara if (!dquots[cnt]) 17367b9ca4c6SJan Kara continue; 17377b9ca4c6SJan Kara /* Back out changes we already did */ 17387b9ca4c6SJan Kara spin_lock(&dquots[cnt]->dq_dqb_lock); 17397b9ca4c6SJan Kara dquots[cnt]->dq_dqb.dqb_curinodes--; 17407b9ca4c6SJan Kara spin_unlock(&dquots[cnt]->dq_dqb_lock); 17417b9ca4c6SJan Kara } 1742884d179dSJan Kara goto warn_put_all; 1743884d179dSJan Kara } 1744884d179dSJan Kara } 1745efd8f0e6SChristoph Hellwig 1746884d179dSJan Kara warn_put_all: 17477b9ca4c6SJan Kara spin_unlock(&inode->i_lock); 174863936ddaSChristoph Hellwig if (ret == 0) 1749bf097aafSJan Kara mark_all_dquot_dirty(dquots); 1750b9ba6f94SNiu Yawei srcu_read_unlock(&dquot_srcu, index); 1751bf097aafSJan Kara flush_warnings(warn); 1752884d179dSJan Kara return ret; 1753884d179dSJan Kara } 1754884d179dSJan Kara EXPORT_SYMBOL(dquot_alloc_inode); 1755884d179dSJan Kara 17565dd4056dSChristoph Hellwig /* 17575dd4056dSChristoph Hellwig * Convert in-memory reserved quotas to real consumed quotas 17585dd4056dSChristoph Hellwig */ 17595dd4056dSChristoph Hellwig int dquot_claim_space_nodirty(struct inode *inode, qsize_t number) 1760884d179dSJan Kara { 17615bcd3b6fSKonstantin Khlebnikov struct dquot **dquots; 1762b9ba6f94SNiu Yawei int cnt, index; 1763884d179dSJan Kara 1764189eef59SChristoph Hellwig if (!dquot_active(inode)) { 17650ed60de3SJan Kara spin_lock(&inode->i_lock); 17660ed60de3SJan Kara *inode_reserved_space(inode) -= number; 17670ed60de3SJan Kara __inode_add_bytes(inode, number); 17680ed60de3SJan Kara spin_unlock(&inode->i_lock); 17695dd4056dSChristoph Hellwig return 0; 1770884d179dSJan Kara } 1771884d179dSJan Kara 17725bcd3b6fSKonstantin Khlebnikov dquots = i_dquot(inode); 1773b9ba6f94SNiu Yawei index = srcu_read_lock(&dquot_srcu); 17747b9ca4c6SJan Kara spin_lock(&inode->i_lock); 1775884d179dSJan Kara /* Claim reserved quotas to allocated quotas */ 1776884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 17773ab167d2SJan Kara if (dquots[cnt]) { 17783ab167d2SJan Kara struct dquot *dquot = dquots[cnt]; 17793ab167d2SJan Kara 17807b9ca4c6SJan Kara spin_lock(&dquot->dq_dqb_lock); 17813ab167d2SJan Kara if (WARN_ON_ONCE(dquot->dq_dqb.dqb_rsvspace < number)) 17823ab167d2SJan Kara number = dquot->dq_dqb.dqb_rsvspace; 17833ab167d2SJan Kara dquot->dq_dqb.dqb_curspace += number; 17843ab167d2SJan Kara dquot->dq_dqb.dqb_rsvspace -= number; 17857b9ca4c6SJan Kara spin_unlock(&dquot->dq_dqb_lock); 17863ab167d2SJan Kara } 1787884d179dSJan Kara } 1788884d179dSJan Kara /* Update inode bytes */ 17890ed60de3SJan Kara *inode_reserved_space(inode) -= number; 17900ed60de3SJan Kara __inode_add_bytes(inode, number); 17910ed60de3SJan Kara spin_unlock(&inode->i_lock); 17925bcd3b6fSKonstantin Khlebnikov mark_all_dquot_dirty(dquots); 1793b9ba6f94SNiu Yawei srcu_read_unlock(&dquot_srcu, index); 17945dd4056dSChristoph Hellwig return 0; 1795884d179dSJan Kara } 17965dd4056dSChristoph Hellwig EXPORT_SYMBOL(dquot_claim_space_nodirty); 1797884d179dSJan Kara 1798884d179dSJan Kara /* 17991c8924ebSJan Kara * Convert allocated space back to in-memory reserved quotas 18001c8924ebSJan Kara */ 18011c8924ebSJan Kara void dquot_reclaim_space_nodirty(struct inode *inode, qsize_t number) 18021c8924ebSJan Kara { 18035bcd3b6fSKonstantin Khlebnikov struct dquot **dquots; 1804b9ba6f94SNiu Yawei int cnt, index; 18051c8924ebSJan Kara 18061c8924ebSJan Kara if (!dquot_active(inode)) { 18070ed60de3SJan Kara spin_lock(&inode->i_lock); 18080ed60de3SJan Kara *inode_reserved_space(inode) += number; 18090ed60de3SJan Kara __inode_sub_bytes(inode, number); 18100ed60de3SJan Kara spin_unlock(&inode->i_lock); 18111c8924ebSJan Kara return; 18121c8924ebSJan Kara } 18131c8924ebSJan Kara 18145bcd3b6fSKonstantin Khlebnikov dquots = i_dquot(inode); 1815b9ba6f94SNiu Yawei index = srcu_read_lock(&dquot_srcu); 18167b9ca4c6SJan Kara spin_lock(&inode->i_lock); 18171c8924ebSJan Kara /* Claim reserved quotas to allocated quotas */ 18181c8924ebSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 18193ab167d2SJan Kara if (dquots[cnt]) { 18203ab167d2SJan Kara struct dquot *dquot = dquots[cnt]; 18213ab167d2SJan Kara 18227b9ca4c6SJan Kara spin_lock(&dquot->dq_dqb_lock); 18233ab167d2SJan Kara if (WARN_ON_ONCE(dquot->dq_dqb.dqb_curspace < number)) 18243ab167d2SJan Kara number = dquot->dq_dqb.dqb_curspace; 18253ab167d2SJan Kara dquot->dq_dqb.dqb_rsvspace += number; 18263ab167d2SJan Kara dquot->dq_dqb.dqb_curspace -= number; 18277b9ca4c6SJan Kara spin_unlock(&dquot->dq_dqb_lock); 18283ab167d2SJan Kara } 18291c8924ebSJan Kara } 18301c8924ebSJan Kara /* Update inode bytes */ 18310ed60de3SJan Kara *inode_reserved_space(inode) += number; 18320ed60de3SJan Kara __inode_sub_bytes(inode, number); 18330ed60de3SJan Kara spin_unlock(&inode->i_lock); 18345bcd3b6fSKonstantin Khlebnikov mark_all_dquot_dirty(dquots); 1835b9ba6f94SNiu Yawei srcu_read_unlock(&dquot_srcu, index); 18361c8924ebSJan Kara return; 18371c8924ebSJan Kara } 18381c8924ebSJan Kara EXPORT_SYMBOL(dquot_reclaim_space_nodirty); 18391c8924ebSJan Kara 18401c8924ebSJan Kara /* 1841884d179dSJan Kara * This operation can block, but only after everything is updated 1842884d179dSJan Kara */ 184356246f9aSEric Sandeen void __dquot_free_space(struct inode *inode, qsize_t number, int flags) 1844884d179dSJan Kara { 1845884d179dSJan Kara unsigned int cnt; 1846bf097aafSJan Kara struct dquot_warn warn[MAXQUOTAS]; 18475bcd3b6fSKonstantin Khlebnikov struct dquot **dquots; 1848b9ba6f94SNiu Yawei int reserve = flags & DQUOT_SPACE_RESERVE, index; 1849884d179dSJan Kara 1850189eef59SChristoph Hellwig if (!dquot_active(inode)) { 1851a478e522SJan Kara if (reserve) { 1852a478e522SJan Kara spin_lock(&inode->i_lock); 1853a478e522SJan Kara *inode_reserved_space(inode) -= number; 1854a478e522SJan Kara spin_unlock(&inode->i_lock); 1855a478e522SJan Kara } else { 1856a478e522SJan Kara inode_sub_bytes(inode, number); 1857a478e522SJan Kara } 18585dd4056dSChristoph Hellwig return; 1859884d179dSJan Kara } 1860884d179dSJan Kara 18615bcd3b6fSKonstantin Khlebnikov dquots = i_dquot(inode); 1862b9ba6f94SNiu Yawei index = srcu_read_lock(&dquot_srcu); 18637b9ca4c6SJan Kara spin_lock(&inode->i_lock); 1864884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1865bf097aafSJan Kara int wtype; 1866bf097aafSJan Kara 1867bf097aafSJan Kara warn[cnt].w_type = QUOTA_NL_NOWARN; 1868bf097aafSJan Kara if (!dquots[cnt]) 1869884d179dSJan Kara continue; 18707b9ca4c6SJan Kara spin_lock(&dquots[cnt]->dq_dqb_lock); 1871bf097aafSJan Kara wtype = info_bdq_free(dquots[cnt], number); 1872bf097aafSJan Kara if (wtype != QUOTA_NL_NOWARN) 1873bf097aafSJan Kara prepare_warning(&warn[cnt], dquots[cnt], wtype); 1874fd8fbfc1SDmitry Monakhov if (reserve) 1875bf097aafSJan Kara dquot_free_reserved_space(dquots[cnt], number); 1876fd8fbfc1SDmitry Monakhov else 1877bf097aafSJan Kara dquot_decr_space(dquots[cnt], number); 18787b9ca4c6SJan Kara spin_unlock(&dquots[cnt]->dq_dqb_lock); 1879884d179dSJan Kara } 18807b9ca4c6SJan Kara if (reserve) 1881a478e522SJan Kara *inode_reserved_space(inode) -= number; 18827b9ca4c6SJan Kara else 18837b9ca4c6SJan Kara __inode_sub_bytes(inode, number); 1884a478e522SJan Kara spin_unlock(&inode->i_lock); 1885fd8fbfc1SDmitry Monakhov 1886fd8fbfc1SDmitry Monakhov if (reserve) 1887fd8fbfc1SDmitry Monakhov goto out_unlock; 1888bf097aafSJan Kara mark_all_dquot_dirty(dquots); 1889fd8fbfc1SDmitry Monakhov out_unlock: 1890b9ba6f94SNiu Yawei srcu_read_unlock(&dquot_srcu, index); 1891bf097aafSJan Kara flush_warnings(warn); 1892884d179dSJan Kara } 18935dd4056dSChristoph Hellwig EXPORT_SYMBOL(__dquot_free_space); 1894fd8fbfc1SDmitry Monakhov 1895fd8fbfc1SDmitry Monakhov /* 1896884d179dSJan Kara * This operation can block, but only after everything is updated 1897884d179dSJan Kara */ 18986bab3596SJan Kara void dquot_free_inode(struct inode *inode) 1899884d179dSJan Kara { 1900884d179dSJan Kara unsigned int cnt; 1901bf097aafSJan Kara struct dquot_warn warn[MAXQUOTAS]; 19025bcd3b6fSKonstantin Khlebnikov struct dquot * const *dquots; 1903b9ba6f94SNiu Yawei int index; 1904884d179dSJan Kara 1905189eef59SChristoph Hellwig if (!dquot_active(inode)) 190663936ddaSChristoph Hellwig return; 1907884d179dSJan Kara 19085bcd3b6fSKonstantin Khlebnikov dquots = i_dquot(inode); 1909b9ba6f94SNiu Yawei index = srcu_read_lock(&dquot_srcu); 19107b9ca4c6SJan Kara spin_lock(&inode->i_lock); 1911884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1912bf097aafSJan Kara int wtype; 1913bf097aafSJan Kara 1914bf097aafSJan Kara warn[cnt].w_type = QUOTA_NL_NOWARN; 1915bf097aafSJan Kara if (!dquots[cnt]) 1916884d179dSJan Kara continue; 19177b9ca4c6SJan Kara spin_lock(&dquots[cnt]->dq_dqb_lock); 1918bf097aafSJan Kara wtype = info_idq_free(dquots[cnt], 1); 1919bf097aafSJan Kara if (wtype != QUOTA_NL_NOWARN) 1920bf097aafSJan Kara prepare_warning(&warn[cnt], dquots[cnt], wtype); 1921bf097aafSJan Kara dquot_decr_inodes(dquots[cnt], 1); 19227b9ca4c6SJan Kara spin_unlock(&dquots[cnt]->dq_dqb_lock); 1923884d179dSJan Kara } 19247b9ca4c6SJan Kara spin_unlock(&inode->i_lock); 1925bf097aafSJan Kara mark_all_dquot_dirty(dquots); 1926b9ba6f94SNiu Yawei srcu_read_unlock(&dquot_srcu, index); 1927bf097aafSJan Kara flush_warnings(warn); 1928884d179dSJan Kara } 1929884d179dSJan Kara EXPORT_SYMBOL(dquot_free_inode); 1930884d179dSJan Kara 1931884d179dSJan Kara /* 1932884d179dSJan Kara * Transfer the number of inode and blocks from one diskquota to an other. 1933bc8e5f07SJan Kara * On success, dquot references in transfer_to are consumed and references 1934bc8e5f07SJan Kara * to original dquots that need to be released are placed there. On failure, 1935bc8e5f07SJan Kara * references are kept untouched. 1936884d179dSJan Kara * 1937884d179dSJan Kara * This operation can block, but only after everything is updated 1938884d179dSJan Kara * A transaction must be started when entering this function. 1939bc8e5f07SJan Kara * 1940b9ba6f94SNiu Yawei * We are holding reference on transfer_from & transfer_to, no need to 1941b9ba6f94SNiu Yawei * protect them by srcu_read_lock(). 1942884d179dSJan Kara */ 1943bc8e5f07SJan Kara int __dquot_transfer(struct inode *inode, struct dquot **transfer_to) 1944884d179dSJan Kara { 19457b9ca4c6SJan Kara qsize_t cur_space; 1946884d179dSJan Kara qsize_t rsv_space = 0; 19477a9ca53aSTahsin Erdogan qsize_t inode_usage = 1; 1948bc8e5f07SJan Kara struct dquot *transfer_from[MAXQUOTAS] = {}; 1949efd8f0e6SChristoph Hellwig int cnt, ret = 0; 19509e32784bSDmitry char is_valid[MAXQUOTAS] = {}; 1951bf097aafSJan Kara struct dquot_warn warn_to[MAXQUOTAS]; 1952bf097aafSJan Kara struct dquot_warn warn_from_inodes[MAXQUOTAS]; 1953bf097aafSJan Kara struct dquot_warn warn_from_space[MAXQUOTAS]; 1954884d179dSJan Kara 1955884d179dSJan Kara if (IS_NOQUOTA(inode)) 1956efd8f0e6SChristoph Hellwig return 0; 19577a9ca53aSTahsin Erdogan 19587a9ca53aSTahsin Erdogan if (inode->i_sb->dq_op->get_inode_usage) { 19597a9ca53aSTahsin Erdogan ret = inode->i_sb->dq_op->get_inode_usage(inode, &inode_usage); 19607a9ca53aSTahsin Erdogan if (ret) 19617a9ca53aSTahsin Erdogan return ret; 19627a9ca53aSTahsin Erdogan } 19637a9ca53aSTahsin Erdogan 1964884d179dSJan Kara /* Initialize the arrays */ 1965bf097aafSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1966bf097aafSJan Kara warn_to[cnt].w_type = QUOTA_NL_NOWARN; 1967bf097aafSJan Kara warn_from_inodes[cnt].w_type = QUOTA_NL_NOWARN; 1968bf097aafSJan Kara warn_from_space[cnt].w_type = QUOTA_NL_NOWARN; 1969bf097aafSJan Kara } 1970b9ba6f94SNiu Yawei 1971b9ba6f94SNiu Yawei spin_lock(&dq_data_lock); 19727b9ca4c6SJan Kara spin_lock(&inode->i_lock); 1973884d179dSJan Kara if (IS_NOQUOTA(inode)) { /* File without quota accounting? */ 19747b9ca4c6SJan Kara spin_unlock(&inode->i_lock); 1975b9ba6f94SNiu Yawei spin_unlock(&dq_data_lock); 1976bc8e5f07SJan Kara return 0; 1977884d179dSJan Kara } 19787b9ca4c6SJan Kara cur_space = __inode_get_bytes(inode); 19797b9ca4c6SJan Kara rsv_space = __inode_get_rsv_space(inode); 19807b9ca4c6SJan Kara /* 19817b9ca4c6SJan Kara * Build the transfer_from list, check limits, and update usage in 19827b9ca4c6SJan Kara * the target structures. 19837b9ca4c6SJan Kara */ 1984884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 19859e32784bSDmitry /* 19869e32784bSDmitry * Skip changes for same uid or gid or for turned off quota-type. 19879e32784bSDmitry */ 1988dd6f3c6dSJan Kara if (!transfer_to[cnt]) 1989884d179dSJan Kara continue; 19909e32784bSDmitry /* Avoid races with quotaoff() */ 19919e32784bSDmitry if (!sb_has_quota_active(inode->i_sb, cnt)) 19929e32784bSDmitry continue; 19939e32784bSDmitry is_valid[cnt] = 1; 19942d0fa467SJan Kara transfer_from[cnt] = i_dquot(inode)[cnt]; 19957b9ca4c6SJan Kara ret = dquot_add_inodes(transfer_to[cnt], inode_usage, 19967b9ca4c6SJan Kara &warn_to[cnt]); 1997efd8f0e6SChristoph Hellwig if (ret) 1998efd8f0e6SChristoph Hellwig goto over_quota; 19997b9ca4c6SJan Kara ret = dquot_add_space(transfer_to[cnt], cur_space, rsv_space, 0, 20007b9ca4c6SJan Kara &warn_to[cnt]); 20017b9ca4c6SJan Kara if (ret) { 20020a51fb71SKonstantin Khlebnikov spin_lock(&transfer_to[cnt]->dq_dqb_lock); 20037b9ca4c6SJan Kara dquot_decr_inodes(transfer_to[cnt], inode_usage); 20040a51fb71SKonstantin Khlebnikov spin_unlock(&transfer_to[cnt]->dq_dqb_lock); 2005884d179dSJan Kara goto over_quota; 2006884d179dSJan Kara } 20077b9ca4c6SJan Kara } 2008884d179dSJan Kara 20097b9ca4c6SJan Kara /* Decrease usage for source structures and update quota pointers */ 2010884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 20119e32784bSDmitry if (!is_valid[cnt]) 2012884d179dSJan Kara continue; 2013884d179dSJan Kara /* Due to IO error we might not have transfer_from[] structure */ 2014884d179dSJan Kara if (transfer_from[cnt]) { 2015bf097aafSJan Kara int wtype; 20167b9ca4c6SJan Kara 20177b9ca4c6SJan Kara spin_lock(&transfer_from[cnt]->dq_dqb_lock); 20187a9ca53aSTahsin Erdogan wtype = info_idq_free(transfer_from[cnt], inode_usage); 2019bf097aafSJan Kara if (wtype != QUOTA_NL_NOWARN) 2020bf097aafSJan Kara prepare_warning(&warn_from_inodes[cnt], 2021bf097aafSJan Kara transfer_from[cnt], wtype); 20227b9ca4c6SJan Kara wtype = info_bdq_free(transfer_from[cnt], 20237b9ca4c6SJan Kara cur_space + rsv_space); 2024bf097aafSJan Kara if (wtype != QUOTA_NL_NOWARN) 2025bf097aafSJan Kara prepare_warning(&warn_from_space[cnt], 2026bf097aafSJan Kara transfer_from[cnt], wtype); 20277a9ca53aSTahsin Erdogan dquot_decr_inodes(transfer_from[cnt], inode_usage); 2028884d179dSJan Kara dquot_decr_space(transfer_from[cnt], cur_space); 2029884d179dSJan Kara dquot_free_reserved_space(transfer_from[cnt], 2030884d179dSJan Kara rsv_space); 20317b9ca4c6SJan Kara spin_unlock(&transfer_from[cnt]->dq_dqb_lock); 2032884d179dSJan Kara } 20332d0fa467SJan Kara i_dquot(inode)[cnt] = transfer_to[cnt]; 2034884d179dSJan Kara } 20357b9ca4c6SJan Kara spin_unlock(&inode->i_lock); 2036884d179dSJan Kara spin_unlock(&dq_data_lock); 2037884d179dSJan Kara 2038dc52dd3aSDmitry Monakhov mark_all_dquot_dirty(transfer_from); 2039dc52dd3aSDmitry Monakhov mark_all_dquot_dirty(transfer_to); 2040bf097aafSJan Kara flush_warnings(warn_to); 2041bf097aafSJan Kara flush_warnings(warn_from_inodes); 2042bf097aafSJan Kara flush_warnings(warn_from_space); 2043bc8e5f07SJan Kara /* Pass back references to put */ 2044dc52dd3aSDmitry Monakhov for (cnt = 0; cnt < MAXQUOTAS; cnt++) 20459e32784bSDmitry if (is_valid[cnt]) 2046bc8e5f07SJan Kara transfer_to[cnt] = transfer_from[cnt]; 204786f3cbecSJan Kara return 0; 2048884d179dSJan Kara over_quota: 20497b9ca4c6SJan Kara /* Back out changes we already did */ 20507b9ca4c6SJan Kara for (cnt--; cnt >= 0; cnt--) { 20517b9ca4c6SJan Kara if (!is_valid[cnt]) 20527b9ca4c6SJan Kara continue; 20537b9ca4c6SJan Kara spin_lock(&transfer_to[cnt]->dq_dqb_lock); 20547b9ca4c6SJan Kara dquot_decr_inodes(transfer_to[cnt], inode_usage); 20557b9ca4c6SJan Kara dquot_decr_space(transfer_to[cnt], cur_space); 20567b9ca4c6SJan Kara dquot_free_reserved_space(transfer_to[cnt], rsv_space); 20577b9ca4c6SJan Kara spin_unlock(&transfer_to[cnt]->dq_dqb_lock); 20587b9ca4c6SJan Kara } 20597b9ca4c6SJan Kara spin_unlock(&inode->i_lock); 2060884d179dSJan Kara spin_unlock(&dq_data_lock); 2061bf097aafSJan Kara flush_warnings(warn_to); 206286f3cbecSJan Kara return ret; 2063884d179dSJan Kara } 2064bc8e5f07SJan Kara EXPORT_SYMBOL(__dquot_transfer); 2065884d179dSJan Kara 20668ddd69d6SDmitry Monakhov /* Wrapper for transferring ownership of an inode for uid/gid only 20678ddd69d6SDmitry Monakhov * Called from FSXXX_setattr() 20688ddd69d6SDmitry Monakhov */ 2069b43fa828SChristoph Hellwig int dquot_transfer(struct inode *inode, struct iattr *iattr) 2070884d179dSJan Kara { 2071bc8e5f07SJan Kara struct dquot *transfer_to[MAXQUOTAS] = {}; 20726184fc0bSJan Kara struct dquot *dquot; 2073bc8e5f07SJan Kara struct super_block *sb = inode->i_sb; 2074bc8e5f07SJan Kara int ret; 20758ddd69d6SDmitry Monakhov 2076189eef59SChristoph Hellwig if (!dquot_active(inode)) 2077884d179dSJan Kara return 0; 2078bc8e5f07SJan Kara 20796184fc0bSJan Kara if (iattr->ia_valid & ATTR_UID && !uid_eq(iattr->ia_uid, inode->i_uid)){ 20806184fc0bSJan Kara dquot = dqget(sb, make_kqid_uid(iattr->ia_uid)); 20816184fc0bSJan Kara if (IS_ERR(dquot)) { 20826184fc0bSJan Kara if (PTR_ERR(dquot) != -ESRCH) { 20836184fc0bSJan Kara ret = PTR_ERR(dquot); 20846184fc0bSJan Kara goto out_put; 20856184fc0bSJan Kara } 20866184fc0bSJan Kara dquot = NULL; 20876184fc0bSJan Kara } 20886184fc0bSJan Kara transfer_to[USRQUOTA] = dquot; 20896184fc0bSJan Kara } 20906184fc0bSJan Kara if (iattr->ia_valid & ATTR_GID && !gid_eq(iattr->ia_gid, inode->i_gid)){ 20916184fc0bSJan Kara dquot = dqget(sb, make_kqid_gid(iattr->ia_gid)); 20926184fc0bSJan Kara if (IS_ERR(dquot)) { 20936184fc0bSJan Kara if (PTR_ERR(dquot) != -ESRCH) { 20946184fc0bSJan Kara ret = PTR_ERR(dquot); 20956184fc0bSJan Kara goto out_put; 20966184fc0bSJan Kara } 20976184fc0bSJan Kara dquot = NULL; 20986184fc0bSJan Kara } 20996184fc0bSJan Kara transfer_to[GRPQUOTA] = dquot; 21006184fc0bSJan Kara } 2101bc8e5f07SJan Kara ret = __dquot_transfer(inode, transfer_to); 21026184fc0bSJan Kara out_put: 2103bc8e5f07SJan Kara dqput_all(transfer_to); 2104bc8e5f07SJan Kara return ret; 2105884d179dSJan Kara } 2106b43fa828SChristoph Hellwig EXPORT_SYMBOL(dquot_transfer); 2107884d179dSJan Kara 2108884d179dSJan Kara /* 2109884d179dSJan Kara * Write info of quota file to disk 2110884d179dSJan Kara */ 2111884d179dSJan Kara int dquot_commit_info(struct super_block *sb, int type) 2112884d179dSJan Kara { 2113884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 2114884d179dSJan Kara 21159a8ae30eSJan Kara return dqopt->ops[type]->write_file_info(sb, type); 2116884d179dSJan Kara } 2117884d179dSJan Kara EXPORT_SYMBOL(dquot_commit_info); 2118884d179dSJan Kara 2119be6257b2SJan Kara int dquot_get_next_id(struct super_block *sb, struct kqid *qid) 2120be6257b2SJan Kara { 2121be6257b2SJan Kara struct quota_info *dqopt = sb_dqopt(sb); 2122be6257b2SJan Kara 21239d1ccbe7SJan Kara if (!sb_has_quota_active(sb, qid->type)) 21249d1ccbe7SJan Kara return -ESRCH; 21259d1ccbe7SJan Kara if (!dqopt->ops[qid->type]->get_next_id) 21269d1ccbe7SJan Kara return -ENOSYS; 2127f14618c6SJan Kara return dqopt->ops[qid->type]->get_next_id(sb, qid); 2128be6257b2SJan Kara } 2129be6257b2SJan Kara EXPORT_SYMBOL(dquot_get_next_id); 2130be6257b2SJan Kara 2131884d179dSJan Kara /* 2132884d179dSJan Kara * Definitions of diskquota operations. 2133884d179dSJan Kara */ 213461e225dcSAlexey Dobriyan const struct dquot_operations dquot_operations = { 2135884d179dSJan Kara .write_dquot = dquot_commit, 2136884d179dSJan Kara .acquire_dquot = dquot_acquire, 2137884d179dSJan Kara .release_dquot = dquot_release, 2138884d179dSJan Kara .mark_dirty = dquot_mark_dquot_dirty, 2139884d179dSJan Kara .write_info = dquot_commit_info, 2140884d179dSJan Kara .alloc_dquot = dquot_alloc, 2141884d179dSJan Kara .destroy_dquot = dquot_destroy, 2142be6257b2SJan Kara .get_next_id = dquot_get_next_id, 2143884d179dSJan Kara }; 2144123e9cafSChristoph Hellwig EXPORT_SYMBOL(dquot_operations); 2145884d179dSJan Kara 2146884d179dSJan Kara /* 2147907f4554SChristoph Hellwig * Generic helper for ->open on filesystems supporting disk quotas. 2148907f4554SChristoph Hellwig */ 2149907f4554SChristoph Hellwig int dquot_file_open(struct inode *inode, struct file *file) 2150907f4554SChristoph Hellwig { 2151907f4554SChristoph Hellwig int error; 2152907f4554SChristoph Hellwig 2153907f4554SChristoph Hellwig error = generic_file_open(inode, file); 2154907f4554SChristoph Hellwig if (!error && (file->f_mode & FMODE_WRITE)) 215588d8ff97SChao Yu error = dquot_initialize(inode); 2156907f4554SChristoph Hellwig return error; 2157907f4554SChristoph Hellwig } 2158907f4554SChristoph Hellwig EXPORT_SYMBOL(dquot_file_open); 2159907f4554SChristoph Hellwig 2160907f4554SChristoph Hellwig /* 2161884d179dSJan Kara * Turn quota off on a device. type == -1 ==> quotaoff for all types (umount) 2162884d179dSJan Kara */ 21630f0dd62fSChristoph Hellwig int dquot_disable(struct super_block *sb, int type, unsigned int flags) 2164884d179dSJan Kara { 2165884d179dSJan Kara int cnt, ret = 0; 2166884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 2167884d179dSJan Kara struct inode *toputinode[MAXQUOTAS]; 2168884d179dSJan Kara 21697d6cd73dSJan Kara /* s_umount should be held in exclusive mode */ 21707d6cd73dSJan Kara if (WARN_ON_ONCE(down_read_trylock(&sb->s_umount))) 21717d6cd73dSJan Kara up_read(&sb->s_umount); 21727d6cd73dSJan Kara 2173884d179dSJan Kara /* Cannot turn off usage accounting without turning off limits, or 2174884d179dSJan Kara * suspend quotas and simultaneously turn quotas off. */ 2175884d179dSJan Kara if ((flags & DQUOT_USAGE_ENABLED && !(flags & DQUOT_LIMITS_ENABLED)) 2176884d179dSJan Kara || (flags & DQUOT_SUSPENDED && flags & (DQUOT_LIMITS_ENABLED | 2177884d179dSJan Kara DQUOT_USAGE_ENABLED))) 2178884d179dSJan Kara return -EINVAL; 2179884d179dSJan Kara 2180884d179dSJan Kara /* 2181884d179dSJan Kara * Skip everything if there's nothing to do. We have to do this because 2182884d179dSJan Kara * sometimes we are called when fill_super() failed and calling 2183884d179dSJan Kara * sync_fs() in such cases does no good. 2184884d179dSJan Kara */ 2185c3b00446SJan Kara if (!sb_any_quota_loaded(sb)) 2186884d179dSJan Kara return 0; 2187c3b00446SJan Kara 2188884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 2189884d179dSJan Kara toputinode[cnt] = NULL; 2190884d179dSJan Kara if (type != -1 && cnt != type) 2191884d179dSJan Kara continue; 2192884d179dSJan Kara if (!sb_has_quota_loaded(sb, cnt)) 2193884d179dSJan Kara continue; 2194884d179dSJan Kara 2195884d179dSJan Kara if (flags & DQUOT_SUSPENDED) { 2196884d179dSJan Kara spin_lock(&dq_state_lock); 2197884d179dSJan Kara dqopt->flags |= 2198884d179dSJan Kara dquot_state_flag(DQUOT_SUSPENDED, cnt); 2199884d179dSJan Kara spin_unlock(&dq_state_lock); 2200884d179dSJan Kara } else { 2201884d179dSJan Kara spin_lock(&dq_state_lock); 2202884d179dSJan Kara dqopt->flags &= ~dquot_state_flag(flags, cnt); 2203884d179dSJan Kara /* Turning off suspended quotas? */ 2204884d179dSJan Kara if (!sb_has_quota_loaded(sb, cnt) && 2205884d179dSJan Kara sb_has_quota_suspended(sb, cnt)) { 2206884d179dSJan Kara dqopt->flags &= ~dquot_state_flag( 2207884d179dSJan Kara DQUOT_SUSPENDED, cnt); 2208884d179dSJan Kara spin_unlock(&dq_state_lock); 2209884d179dSJan Kara iput(dqopt->files[cnt]); 2210884d179dSJan Kara dqopt->files[cnt] = NULL; 2211884d179dSJan Kara continue; 2212884d179dSJan Kara } 2213884d179dSJan Kara spin_unlock(&dq_state_lock); 2214884d179dSJan Kara } 2215884d179dSJan Kara 2216884d179dSJan Kara /* We still have to keep quota loaded? */ 2217884d179dSJan Kara if (sb_has_quota_loaded(sb, cnt) && !(flags & DQUOT_SUSPENDED)) 2218884d179dSJan Kara continue; 2219884d179dSJan Kara 2220884d179dSJan Kara /* Note: these are blocking operations */ 2221884d179dSJan Kara drop_dquot_ref(sb, cnt); 2222884d179dSJan Kara invalidate_dquots(sb, cnt); 2223884d179dSJan Kara /* 2224268157baSJan Kara * Now all dquots should be invalidated, all writes done so we 2225268157baSJan Kara * should be only users of the info. No locks needed. 2226884d179dSJan Kara */ 2227884d179dSJan Kara if (info_dirty(&dqopt->info[cnt])) 2228884d179dSJan Kara sb->dq_op->write_info(sb, cnt); 2229884d179dSJan Kara if (dqopt->ops[cnt]->free_file_info) 2230884d179dSJan Kara dqopt->ops[cnt]->free_file_info(sb, cnt); 2231884d179dSJan Kara put_quota_format(dqopt->info[cnt].dqi_format); 2232884d179dSJan Kara 2233884d179dSJan Kara toputinode[cnt] = dqopt->files[cnt]; 2234884d179dSJan Kara if (!sb_has_quota_loaded(sb, cnt)) 2235884d179dSJan Kara dqopt->files[cnt] = NULL; 2236884d179dSJan Kara dqopt->info[cnt].dqi_flags = 0; 2237884d179dSJan Kara dqopt->info[cnt].dqi_igrace = 0; 2238884d179dSJan Kara dqopt->info[cnt].dqi_bgrace = 0; 2239884d179dSJan Kara dqopt->ops[cnt] = NULL; 2240884d179dSJan Kara } 2241884d179dSJan Kara 2242884d179dSJan Kara /* Skip syncing and setting flags if quota files are hidden */ 2243884d179dSJan Kara if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) 2244884d179dSJan Kara goto put_inodes; 2245884d179dSJan Kara 2246884d179dSJan Kara /* Sync the superblock so that buffers with quota data are written to 2247884d179dSJan Kara * disk (and so userspace sees correct data afterwards). */ 2248884d179dSJan Kara if (sb->s_op->sync_fs) 2249884d179dSJan Kara sb->s_op->sync_fs(sb, 1); 2250884d179dSJan Kara sync_blockdev(sb->s_bdev); 2251884d179dSJan Kara /* Now the quota files are just ordinary files and we can set the 2252884d179dSJan Kara * inode flags back. Moreover we discard the pagecache so that 2253884d179dSJan Kara * userspace sees the writes we did bypassing the pagecache. We 2254884d179dSJan Kara * must also discard the blockdev buffers so that we see the 2255884d179dSJan Kara * changes done by userspace on the next quotaon() */ 2256884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 22572700e606SJan Kara /* This can happen when suspending quotas on remount-ro... */ 22582700e606SJan Kara if (toputinode[cnt] && !sb_has_quota_loaded(sb, cnt)) { 22595955102cSAl Viro inode_lock(toputinode[cnt]); 2260aad6cde9SJan Kara toputinode[cnt]->i_flags &= ~S_NOQUOTA; 2261c3b00446SJan Kara truncate_inode_pages(&toputinode[cnt]->i_data, 0); 22625955102cSAl Viro inode_unlock(toputinode[cnt]); 226343d2932dSJan Kara mark_inode_dirty_sync(toputinode[cnt]); 2264884d179dSJan Kara } 2265884d179dSJan Kara if (sb->s_bdev) 2266884d179dSJan Kara invalidate_bdev(sb->s_bdev); 2267884d179dSJan Kara put_inodes: 2268884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 2269884d179dSJan Kara if (toputinode[cnt]) { 2270884d179dSJan Kara /* On remount RO, we keep the inode pointer so that we 2271884d179dSJan Kara * can reenable quota on the subsequent remount RW. We 2272884d179dSJan Kara * have to check 'flags' variable and not use sb_has_ 2273884d179dSJan Kara * function because another quotaon / quotaoff could 2274884d179dSJan Kara * change global state before we got here. We refuse 2275884d179dSJan Kara * to suspend quotas when there is pending delete on 2276884d179dSJan Kara * the quota file... */ 2277884d179dSJan Kara if (!(flags & DQUOT_SUSPENDED)) 2278884d179dSJan Kara iput(toputinode[cnt]); 2279884d179dSJan Kara else if (!toputinode[cnt]->i_nlink) 2280884d179dSJan Kara ret = -EBUSY; 2281884d179dSJan Kara } 2282884d179dSJan Kara return ret; 2283884d179dSJan Kara } 22840f0dd62fSChristoph Hellwig EXPORT_SYMBOL(dquot_disable); 2285884d179dSJan Kara 2286287a8095SChristoph Hellwig int dquot_quota_off(struct super_block *sb, int type) 2287884d179dSJan Kara { 22880f0dd62fSChristoph Hellwig return dquot_disable(sb, type, 22890f0dd62fSChristoph Hellwig DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); 2290884d179dSJan Kara } 2291287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_quota_off); 22920f0dd62fSChristoph Hellwig 2293884d179dSJan Kara /* 2294884d179dSJan Kara * Turn quotas on on a device 2295884d179dSJan Kara */ 2296884d179dSJan Kara 2297884d179dSJan Kara /* 2298884d179dSJan Kara * Helper function to turn quotas on when we already have the inode of 2299884d179dSJan Kara * quota file and no quota information is loaded. 2300884d179dSJan Kara */ 2301884d179dSJan Kara static int vfs_load_quota_inode(struct inode *inode, int type, int format_id, 2302884d179dSJan Kara unsigned int flags) 2303884d179dSJan Kara { 2304884d179dSJan Kara struct quota_format_type *fmt = find_quota_format(format_id); 2305884d179dSJan Kara struct super_block *sb = inode->i_sb; 2306884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 2307884d179dSJan Kara int error; 2308884d179dSJan Kara 2309884d179dSJan Kara if (!fmt) 2310884d179dSJan Kara return -ESRCH; 2311884d179dSJan Kara if (!S_ISREG(inode->i_mode)) { 2312884d179dSJan Kara error = -EACCES; 2313884d179dSJan Kara goto out_fmt; 2314884d179dSJan Kara } 2315884d179dSJan Kara if (IS_RDONLY(inode)) { 2316884d179dSJan Kara error = -EROFS; 2317884d179dSJan Kara goto out_fmt; 2318884d179dSJan Kara } 2319847aac64SLi Xi if (!sb->s_op->quota_write || !sb->s_op->quota_read || 2320847aac64SLi Xi (type == PRJQUOTA && sb->dq_op->get_projid == NULL)) { 2321884d179dSJan Kara error = -EINVAL; 2322884d179dSJan Kara goto out_fmt; 2323884d179dSJan Kara } 23245c004828SEric W. Biederman /* Filesystems outside of init_user_ns not yet supported */ 23255c004828SEric W. Biederman if (sb->s_user_ns != &init_user_ns) { 23265c004828SEric W. Biederman error = -EINVAL; 23275c004828SEric W. Biederman goto out_fmt; 23285c004828SEric W. Biederman } 2329884d179dSJan Kara /* Usage always has to be set... */ 2330884d179dSJan Kara if (!(flags & DQUOT_USAGE_ENABLED)) { 2331884d179dSJan Kara error = -EINVAL; 2332884d179dSJan Kara goto out_fmt; 2333884d179dSJan Kara } 2334c3b00446SJan Kara if (sb_has_quota_loaded(sb, type)) { 2335c3b00446SJan Kara error = -EBUSY; 2336c3b00446SJan Kara goto out_fmt; 2337c3b00446SJan Kara } 2338884d179dSJan Kara 2339884d179dSJan Kara if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) { 2340ab94c39bSJan Kara /* As we bypass the pagecache we must now flush all the 2341ab94c39bSJan Kara * dirty data and invalidate caches so that kernel sees 2342ab94c39bSJan Kara * changes from userspace. It is not enough to just flush 2343ab94c39bSJan Kara * the quota file since if blocksize < pagesize, invalidation 2344ab94c39bSJan Kara * of the cache could fail because of other unrelated dirty 2345ab94c39bSJan Kara * data */ 2346ab94c39bSJan Kara sync_filesystem(sb); 2347884d179dSJan Kara invalidate_bdev(sb->s_bdev); 2348884d179dSJan Kara } 2349884d179dSJan Kara 2350884d179dSJan Kara if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) { 2351884d179dSJan Kara /* We don't want quota and atime on quota files (deadlocks 2352884d179dSJan Kara * possible) Also nobody should write to the file - we use 2353884d179dSJan Kara * special IO operations which ignore the immutable bit. */ 23545955102cSAl Viro inode_lock(inode); 2355aad6cde9SJan Kara inode->i_flags |= S_NOQUOTA; 23565955102cSAl Viro inode_unlock(inode); 235726245c94SJan Kara /* 235826245c94SJan Kara * When S_NOQUOTA is set, remove dquot references as no more 235926245c94SJan Kara * references can be added 236026245c94SJan Kara */ 23619f754758SChristoph Hellwig __dquot_drop(inode); 2362884d179dSJan Kara } 2363884d179dSJan Kara 2364884d179dSJan Kara error = -EIO; 2365884d179dSJan Kara dqopt->files[type] = igrab(inode); 2366884d179dSJan Kara if (!dqopt->files[type]) 2367c3b00446SJan Kara goto out_file_flags; 2368884d179dSJan Kara error = -EINVAL; 2369884d179dSJan Kara if (!fmt->qf_ops->check_quota_file(sb, type)) 2370884d179dSJan Kara goto out_file_init; 2371884d179dSJan Kara 2372884d179dSJan Kara dqopt->ops[type] = fmt->qf_ops; 2373884d179dSJan Kara dqopt->info[type].dqi_format = fmt; 2374884d179dSJan Kara dqopt->info[type].dqi_fmt_id = format_id; 2375884d179dSJan Kara INIT_LIST_HEAD(&dqopt->info[type].dqi_dirty_list); 2376268157baSJan Kara error = dqopt->ops[type]->read_file_info(sb, type); 237742fdb858SJan Kara if (error < 0) 2378884d179dSJan Kara goto out_file_init; 237915512377SJan Kara if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) { 238015512377SJan Kara spin_lock(&dq_data_lock); 238146fe44ceSJan Kara dqopt->info[type].dqi_flags |= DQF_SYS_FILE; 238215512377SJan Kara spin_unlock(&dq_data_lock); 238315512377SJan Kara } 2384884d179dSJan Kara spin_lock(&dq_state_lock); 2385884d179dSJan Kara dqopt->flags |= dquot_state_flag(flags, type); 2386884d179dSJan Kara spin_unlock(&dq_state_lock); 2387884d179dSJan Kara 23881a6152d3SChao Yu error = add_dquot_ref(sb, type); 23891a6152d3SChao Yu if (error) 23901a6152d3SChao Yu dquot_disable(sb, type, flags); 2391884d179dSJan Kara 23921a6152d3SChao Yu return error; 2393884d179dSJan Kara out_file_init: 2394884d179dSJan Kara dqopt->files[type] = NULL; 2395884d179dSJan Kara iput(inode); 2396c3b00446SJan Kara out_file_flags: 23975955102cSAl Viro inode_lock(inode); 2398aad6cde9SJan Kara inode->i_flags &= ~S_NOQUOTA; 23995955102cSAl Viro inode_unlock(inode); 2400884d179dSJan Kara out_fmt: 2401884d179dSJan Kara put_quota_format(fmt); 2402884d179dSJan Kara 2403884d179dSJan Kara return error; 2404884d179dSJan Kara } 2405884d179dSJan Kara 2406884d179dSJan Kara /* Reenable quotas on remount RW */ 24070f0dd62fSChristoph Hellwig int dquot_resume(struct super_block *sb, int type) 2408884d179dSJan Kara { 2409884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 2410884d179dSJan Kara struct inode *inode; 24110f0dd62fSChristoph Hellwig int ret = 0, cnt; 2412884d179dSJan Kara unsigned int flags; 2413884d179dSJan Kara 24147d6cd73dSJan Kara /* s_umount should be held in exclusive mode */ 24157d6cd73dSJan Kara if (WARN_ON_ONCE(down_read_trylock(&sb->s_umount))) 24167d6cd73dSJan Kara up_read(&sb->s_umount); 24177d6cd73dSJan Kara 24180f0dd62fSChristoph Hellwig for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 24190f0dd62fSChristoph Hellwig if (type != -1 && cnt != type) 24200f0dd62fSChristoph Hellwig continue; 2421c3b00446SJan Kara if (!sb_has_quota_suspended(sb, cnt)) 24220f0dd62fSChristoph Hellwig continue; 2423c3b00446SJan Kara 24240f0dd62fSChristoph Hellwig inode = dqopt->files[cnt]; 24250f0dd62fSChristoph Hellwig dqopt->files[cnt] = NULL; 2426884d179dSJan Kara spin_lock(&dq_state_lock); 2427884d179dSJan Kara flags = dqopt->flags & dquot_state_flag(DQUOT_USAGE_ENABLED | 24280f0dd62fSChristoph Hellwig DQUOT_LIMITS_ENABLED, 24290f0dd62fSChristoph Hellwig cnt); 24300f0dd62fSChristoph Hellwig dqopt->flags &= ~dquot_state_flag(DQUOT_STATE_FLAGS, cnt); 2431884d179dSJan Kara spin_unlock(&dq_state_lock); 2432884d179dSJan Kara 24330f0dd62fSChristoph Hellwig flags = dquot_generic_flag(flags, cnt); 24340f0dd62fSChristoph Hellwig ret = vfs_load_quota_inode(inode, cnt, 24350f0dd62fSChristoph Hellwig dqopt->info[cnt].dqi_fmt_id, flags); 2436884d179dSJan Kara iput(inode); 24370f0dd62fSChristoph Hellwig } 2438884d179dSJan Kara 2439884d179dSJan Kara return ret; 2440884d179dSJan Kara } 24410f0dd62fSChristoph Hellwig EXPORT_SYMBOL(dquot_resume); 2442884d179dSJan Kara 2443f00c9e44SJan Kara int dquot_quota_on(struct super_block *sb, int type, int format_id, 24448c54ca9cSAl Viro const struct path *path) 2445884d179dSJan Kara { 2446884d179dSJan Kara int error = security_quota_on(path->dentry); 2447884d179dSJan Kara if (error) 2448884d179dSJan Kara return error; 2449884d179dSJan Kara /* Quota file not on the same filesystem? */ 2450d8c9584eSAl Viro if (path->dentry->d_sb != sb) 2451884d179dSJan Kara error = -EXDEV; 2452884d179dSJan Kara else 2453dea655c2SDavid Howells error = vfs_load_quota_inode(d_inode(path->dentry), type, 2454884d179dSJan Kara format_id, DQUOT_USAGE_ENABLED | 2455884d179dSJan Kara DQUOT_LIMITS_ENABLED); 2456884d179dSJan Kara return error; 2457884d179dSJan Kara } 2458287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_quota_on); 2459884d179dSJan Kara 2460884d179dSJan Kara /* 2461884d179dSJan Kara * More powerful function for turning on quotas allowing setting 2462884d179dSJan Kara * of individual quota flags 2463884d179dSJan Kara */ 2464287a8095SChristoph Hellwig int dquot_enable(struct inode *inode, int type, int format_id, 2465884d179dSJan Kara unsigned int flags) 2466884d179dSJan Kara { 2467884d179dSJan Kara struct super_block *sb = inode->i_sb; 2468884d179dSJan Kara 2469884d179dSJan Kara /* Just unsuspend quotas? */ 24700f0dd62fSChristoph Hellwig BUG_ON(flags & DQUOT_SUSPENDED); 24717d6cd73dSJan Kara /* s_umount should be held in exclusive mode */ 24727d6cd73dSJan Kara if (WARN_ON_ONCE(down_read_trylock(&sb->s_umount))) 24737d6cd73dSJan Kara up_read(&sb->s_umount); 24740f0dd62fSChristoph Hellwig 2475884d179dSJan Kara if (!flags) 2476884d179dSJan Kara return 0; 2477884d179dSJan Kara /* Just updating flags needed? */ 2478884d179dSJan Kara if (sb_has_quota_loaded(sb, type)) { 2479884d179dSJan Kara if (flags & DQUOT_USAGE_ENABLED && 2480c3b00446SJan Kara sb_has_quota_usage_enabled(sb, type)) 2481c3b00446SJan Kara return -EBUSY; 2482884d179dSJan Kara if (flags & DQUOT_LIMITS_ENABLED && 2483c3b00446SJan Kara sb_has_quota_limits_enabled(sb, type)) 2484c3b00446SJan Kara return -EBUSY; 2485884d179dSJan Kara spin_lock(&dq_state_lock); 2486884d179dSJan Kara sb_dqopt(sb)->flags |= dquot_state_flag(flags, type); 2487884d179dSJan Kara spin_unlock(&dq_state_lock); 2488c3b00446SJan Kara return 0; 2489884d179dSJan Kara } 2490884d179dSJan Kara 2491884d179dSJan Kara return vfs_load_quota_inode(inode, type, format_id, flags); 2492884d179dSJan Kara } 2493287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_enable); 2494884d179dSJan Kara 2495884d179dSJan Kara /* 2496884d179dSJan Kara * This function is used when filesystem needs to initialize quotas 2497884d179dSJan Kara * during mount time. 2498884d179dSJan Kara */ 2499287a8095SChristoph Hellwig int dquot_quota_on_mount(struct super_block *sb, char *qf_name, 2500884d179dSJan Kara int format_id, int type) 2501884d179dSJan Kara { 2502884d179dSJan Kara struct dentry *dentry; 2503884d179dSJan Kara int error; 2504884d179dSJan Kara 2505e12a4e8aSAl Viro dentry = lookup_one_len_unlocked(qf_name, sb->s_root, strlen(qf_name)); 2506884d179dSJan Kara if (IS_ERR(dentry)) 2507884d179dSJan Kara return PTR_ERR(dentry); 2508884d179dSJan Kara 2509dea655c2SDavid Howells if (d_really_is_negative(dentry)) { 2510884d179dSJan Kara error = -ENOENT; 2511884d179dSJan Kara goto out; 2512884d179dSJan Kara } 2513884d179dSJan Kara 2514884d179dSJan Kara error = security_quota_on(dentry); 2515884d179dSJan Kara if (!error) 2516dea655c2SDavid Howells error = vfs_load_quota_inode(d_inode(dentry), type, format_id, 2517884d179dSJan Kara DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); 2518884d179dSJan Kara 2519884d179dSJan Kara out: 2520884d179dSJan Kara dput(dentry); 2521884d179dSJan Kara return error; 2522884d179dSJan Kara } 2523287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_quota_on_mount); 2524884d179dSJan Kara 25253e2af67eSJan Kara static int dquot_quota_enable(struct super_block *sb, unsigned int flags) 25263e2af67eSJan Kara { 25273e2af67eSJan Kara int ret; 25283e2af67eSJan Kara int type; 25293e2af67eSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 25303e2af67eSJan Kara 25313e2af67eSJan Kara if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) 25323e2af67eSJan Kara return -ENOSYS; 25333e2af67eSJan Kara /* Accounting cannot be turned on while fs is mounted */ 25343e2af67eSJan Kara flags &= ~(FS_QUOTA_UDQ_ACCT | FS_QUOTA_GDQ_ACCT | FS_QUOTA_PDQ_ACCT); 25353e2af67eSJan Kara if (!flags) 25363e2af67eSJan Kara return -EINVAL; 25373e2af67eSJan Kara for (type = 0; type < MAXQUOTAS; type++) { 25383e2af67eSJan Kara if (!(flags & qtype_enforce_flag(type))) 25393e2af67eSJan Kara continue; 25403e2af67eSJan Kara /* Can't enforce without accounting */ 25413e2af67eSJan Kara if (!sb_has_quota_usage_enabled(sb, type)) 25423e2af67eSJan Kara return -EINVAL; 25433e2af67eSJan Kara ret = dquot_enable(dqopt->files[type], type, 25443e2af67eSJan Kara dqopt->info[type].dqi_fmt_id, 25453e2af67eSJan Kara DQUOT_LIMITS_ENABLED); 25463e2af67eSJan Kara if (ret < 0) 25473e2af67eSJan Kara goto out_err; 25483e2af67eSJan Kara } 25493e2af67eSJan Kara return 0; 25503e2af67eSJan Kara out_err: 25513e2af67eSJan Kara /* Backout enforcement enablement we already did */ 25523e2af67eSJan Kara for (type--; type >= 0; type--) { 25533e2af67eSJan Kara if (flags & qtype_enforce_flag(type)) 25543e2af67eSJan Kara dquot_disable(sb, type, DQUOT_LIMITS_ENABLED); 25553e2af67eSJan Kara } 25563e2af67eSJan Kara /* Error code translation for better compatibility with XFS */ 25573e2af67eSJan Kara if (ret == -EBUSY) 25583e2af67eSJan Kara ret = -EEXIST; 25593e2af67eSJan Kara return ret; 25603e2af67eSJan Kara } 25613e2af67eSJan Kara 25623e2af67eSJan Kara static int dquot_quota_disable(struct super_block *sb, unsigned int flags) 25633e2af67eSJan Kara { 25643e2af67eSJan Kara int ret; 25653e2af67eSJan Kara int type; 25663e2af67eSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 25673e2af67eSJan Kara 25683e2af67eSJan Kara if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) 25693e2af67eSJan Kara return -ENOSYS; 25703e2af67eSJan Kara /* 25713e2af67eSJan Kara * We don't support turning off accounting via quotactl. In principle 25723e2af67eSJan Kara * quota infrastructure can do this but filesystems don't expect 25733e2af67eSJan Kara * userspace to be able to do it. 25743e2af67eSJan Kara */ 25753e2af67eSJan Kara if (flags & 25763e2af67eSJan Kara (FS_QUOTA_UDQ_ACCT | FS_QUOTA_GDQ_ACCT | FS_QUOTA_PDQ_ACCT)) 25773e2af67eSJan Kara return -EOPNOTSUPP; 25783e2af67eSJan Kara 25793e2af67eSJan Kara /* Filter out limits not enabled */ 25803e2af67eSJan Kara for (type = 0; type < MAXQUOTAS; type++) 25813e2af67eSJan Kara if (!sb_has_quota_limits_enabled(sb, type)) 25823e2af67eSJan Kara flags &= ~qtype_enforce_flag(type); 25833e2af67eSJan Kara /* Nothing left? */ 25843e2af67eSJan Kara if (!flags) 25853e2af67eSJan Kara return -EEXIST; 25863e2af67eSJan Kara for (type = 0; type < MAXQUOTAS; type++) { 25873e2af67eSJan Kara if (flags & qtype_enforce_flag(type)) { 25883e2af67eSJan Kara ret = dquot_disable(sb, type, DQUOT_LIMITS_ENABLED); 25893e2af67eSJan Kara if (ret < 0) 25903e2af67eSJan Kara goto out_err; 25913e2af67eSJan Kara } 25923e2af67eSJan Kara } 25933e2af67eSJan Kara return 0; 25943e2af67eSJan Kara out_err: 25953e2af67eSJan Kara /* Backout enforcement disabling we already did */ 25963e2af67eSJan Kara for (type--; type >= 0; type--) { 25973e2af67eSJan Kara if (flags & qtype_enforce_flag(type)) 25983e2af67eSJan Kara dquot_enable(dqopt->files[type], type, 25993e2af67eSJan Kara dqopt->info[type].dqi_fmt_id, 26003e2af67eSJan Kara DQUOT_LIMITS_ENABLED); 26013e2af67eSJan Kara } 26023e2af67eSJan Kara return ret; 26033e2af67eSJan Kara } 26043e2af67eSJan Kara 2605884d179dSJan Kara /* Generic routine for getting common part of quota structure */ 260614bf61ffSJan Kara static void do_get_dqblk(struct dquot *dquot, struct qc_dqblk *di) 2607884d179dSJan Kara { 2608884d179dSJan Kara struct mem_dqblk *dm = &dquot->dq_dqb; 2609884d179dSJan Kara 2610b9b2dd36SChristoph Hellwig memset(di, 0, sizeof(*di)); 26117b9ca4c6SJan Kara spin_lock(&dquot->dq_dqb_lock); 261214bf61ffSJan Kara di->d_spc_hardlimit = dm->dqb_bhardlimit; 261314bf61ffSJan Kara di->d_spc_softlimit = dm->dqb_bsoftlimit; 2614b9b2dd36SChristoph Hellwig di->d_ino_hardlimit = dm->dqb_ihardlimit; 2615b9b2dd36SChristoph Hellwig di->d_ino_softlimit = dm->dqb_isoftlimit; 261614bf61ffSJan Kara di->d_space = dm->dqb_curspace + dm->dqb_rsvspace; 261714bf61ffSJan Kara di->d_ino_count = dm->dqb_curinodes; 261814bf61ffSJan Kara di->d_spc_timer = dm->dqb_btime; 261914bf61ffSJan Kara di->d_ino_timer = dm->dqb_itime; 26207b9ca4c6SJan Kara spin_unlock(&dquot->dq_dqb_lock); 2621884d179dSJan Kara } 2622884d179dSJan Kara 262374a8a103SEric W. Biederman int dquot_get_dqblk(struct super_block *sb, struct kqid qid, 262414bf61ffSJan Kara struct qc_dqblk *di) 2625884d179dSJan Kara { 2626884d179dSJan Kara struct dquot *dquot; 2627884d179dSJan Kara 2628aca645a6SEric W. Biederman dquot = dqget(sb, qid); 26296184fc0bSJan Kara if (IS_ERR(dquot)) 26306184fc0bSJan Kara return PTR_ERR(dquot); 2631884d179dSJan Kara do_get_dqblk(dquot, di); 2632884d179dSJan Kara dqput(dquot); 2633884d179dSJan Kara 2634884d179dSJan Kara return 0; 2635884d179dSJan Kara } 2636287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_get_dqblk); 2637884d179dSJan Kara 2638be6257b2SJan Kara int dquot_get_next_dqblk(struct super_block *sb, struct kqid *qid, 2639be6257b2SJan Kara struct qc_dqblk *di) 2640be6257b2SJan Kara { 2641be6257b2SJan Kara struct dquot *dquot; 2642be6257b2SJan Kara int err; 2643be6257b2SJan Kara 2644be6257b2SJan Kara if (!sb->dq_op->get_next_id) 2645be6257b2SJan Kara return -ENOSYS; 2646be6257b2SJan Kara err = sb->dq_op->get_next_id(sb, qid); 2647be6257b2SJan Kara if (err < 0) 2648be6257b2SJan Kara return err; 2649be6257b2SJan Kara dquot = dqget(sb, *qid); 2650be6257b2SJan Kara if (IS_ERR(dquot)) 2651be6257b2SJan Kara return PTR_ERR(dquot); 2652be6257b2SJan Kara do_get_dqblk(dquot, di); 2653be6257b2SJan Kara dqput(dquot); 2654be6257b2SJan Kara 2655be6257b2SJan Kara return 0; 2656be6257b2SJan Kara } 2657be6257b2SJan Kara EXPORT_SYMBOL(dquot_get_next_dqblk); 2658be6257b2SJan Kara 265914bf61ffSJan Kara #define VFS_QC_MASK \ 266014bf61ffSJan Kara (QC_SPACE | QC_SPC_SOFT | QC_SPC_HARD | \ 266114bf61ffSJan Kara QC_INO_COUNT | QC_INO_SOFT | QC_INO_HARD | \ 266214bf61ffSJan Kara QC_SPC_TIMER | QC_INO_TIMER) 2663c472b432SChristoph Hellwig 2664884d179dSJan Kara /* Generic routine for setting common part of quota structure */ 266514bf61ffSJan Kara static int do_set_dqblk(struct dquot *dquot, struct qc_dqblk *di) 2666884d179dSJan Kara { 2667884d179dSJan Kara struct mem_dqblk *dm = &dquot->dq_dqb; 2668884d179dSJan Kara int check_blim = 0, check_ilim = 0; 26694c376dcaSEric W. Biederman struct mem_dqinfo *dqi = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_id.type]; 2670884d179dSJan Kara 267114bf61ffSJan Kara if (di->d_fieldmask & ~VFS_QC_MASK) 2672c472b432SChristoph Hellwig return -EINVAL; 2673c472b432SChristoph Hellwig 267414bf61ffSJan Kara if (((di->d_fieldmask & QC_SPC_SOFT) && 2675b10a0819SJan Kara di->d_spc_softlimit > dqi->dqi_max_spc_limit) || 267614bf61ffSJan Kara ((di->d_fieldmask & QC_SPC_HARD) && 2677b10a0819SJan Kara di->d_spc_hardlimit > dqi->dqi_max_spc_limit) || 267814bf61ffSJan Kara ((di->d_fieldmask & QC_INO_SOFT) && 2679b10a0819SJan Kara (di->d_ino_softlimit > dqi->dqi_max_ino_limit)) || 268014bf61ffSJan Kara ((di->d_fieldmask & QC_INO_HARD) && 2681b10a0819SJan Kara (di->d_ino_hardlimit > dqi->dqi_max_ino_limit))) 2682884d179dSJan Kara return -ERANGE; 2683884d179dSJan Kara 26847b9ca4c6SJan Kara spin_lock(&dquot->dq_dqb_lock); 268514bf61ffSJan Kara if (di->d_fieldmask & QC_SPACE) { 268614bf61ffSJan Kara dm->dqb_curspace = di->d_space - dm->dqb_rsvspace; 2687884d179dSJan Kara check_blim = 1; 268808261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags); 2689884d179dSJan Kara } 2690c472b432SChristoph Hellwig 269114bf61ffSJan Kara if (di->d_fieldmask & QC_SPC_SOFT) 269214bf61ffSJan Kara dm->dqb_bsoftlimit = di->d_spc_softlimit; 269314bf61ffSJan Kara if (di->d_fieldmask & QC_SPC_HARD) 269414bf61ffSJan Kara dm->dqb_bhardlimit = di->d_spc_hardlimit; 269514bf61ffSJan Kara if (di->d_fieldmask & (QC_SPC_SOFT | QC_SPC_HARD)) { 2696884d179dSJan Kara check_blim = 1; 269708261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags); 2698884d179dSJan Kara } 2699c472b432SChristoph Hellwig 270014bf61ffSJan Kara if (di->d_fieldmask & QC_INO_COUNT) { 270114bf61ffSJan Kara dm->dqb_curinodes = di->d_ino_count; 2702884d179dSJan Kara check_ilim = 1; 270308261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags); 2704884d179dSJan Kara } 2705c472b432SChristoph Hellwig 270614bf61ffSJan Kara if (di->d_fieldmask & QC_INO_SOFT) 2707c472b432SChristoph Hellwig dm->dqb_isoftlimit = di->d_ino_softlimit; 270814bf61ffSJan Kara if (di->d_fieldmask & QC_INO_HARD) 2709c472b432SChristoph Hellwig dm->dqb_ihardlimit = di->d_ino_hardlimit; 271014bf61ffSJan Kara if (di->d_fieldmask & (QC_INO_SOFT | QC_INO_HARD)) { 2711884d179dSJan Kara check_ilim = 1; 271208261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags); 2713884d179dSJan Kara } 2714c472b432SChristoph Hellwig 271514bf61ffSJan Kara if (di->d_fieldmask & QC_SPC_TIMER) { 271614bf61ffSJan Kara dm->dqb_btime = di->d_spc_timer; 2717884d179dSJan Kara check_blim = 1; 271808261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags); 2719884d179dSJan Kara } 2720c472b432SChristoph Hellwig 272114bf61ffSJan Kara if (di->d_fieldmask & QC_INO_TIMER) { 272214bf61ffSJan Kara dm->dqb_itime = di->d_ino_timer; 2723884d179dSJan Kara check_ilim = 1; 272408261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags); 2725884d179dSJan Kara } 2726884d179dSJan Kara 2727884d179dSJan Kara if (check_blim) { 2728268157baSJan Kara if (!dm->dqb_bsoftlimit || 272941e327b5Szhangyi (F) dm->dqb_curspace + dm->dqb_rsvspace < dm->dqb_bsoftlimit) { 2730884d179dSJan Kara dm->dqb_btime = 0; 2731884d179dSJan Kara clear_bit(DQ_BLKS_B, &dquot->dq_flags); 273214bf61ffSJan Kara } else if (!(di->d_fieldmask & QC_SPC_TIMER)) 2733268157baSJan Kara /* Set grace only if user hasn't provided his own... */ 2734e008bb61SArnd Bergmann dm->dqb_btime = ktime_get_real_seconds() + dqi->dqi_bgrace; 2735884d179dSJan Kara } 2736884d179dSJan Kara if (check_ilim) { 2737268157baSJan Kara if (!dm->dqb_isoftlimit || 2738268157baSJan Kara dm->dqb_curinodes < dm->dqb_isoftlimit) { 2739884d179dSJan Kara dm->dqb_itime = 0; 2740884d179dSJan Kara clear_bit(DQ_INODES_B, &dquot->dq_flags); 274114bf61ffSJan Kara } else if (!(di->d_fieldmask & QC_INO_TIMER)) 2742268157baSJan Kara /* Set grace only if user hasn't provided his own... */ 2743e008bb61SArnd Bergmann dm->dqb_itime = ktime_get_real_seconds() + dqi->dqi_igrace; 2744884d179dSJan Kara } 2745268157baSJan Kara if (dm->dqb_bhardlimit || dm->dqb_bsoftlimit || dm->dqb_ihardlimit || 2746268157baSJan Kara dm->dqb_isoftlimit) 2747884d179dSJan Kara clear_bit(DQ_FAKE_B, &dquot->dq_flags); 2748884d179dSJan Kara else 2749884d179dSJan Kara set_bit(DQ_FAKE_B, &dquot->dq_flags); 27507b9ca4c6SJan Kara spin_unlock(&dquot->dq_dqb_lock); 2751884d179dSJan Kara mark_dquot_dirty(dquot); 2752884d179dSJan Kara 2753884d179dSJan Kara return 0; 2754884d179dSJan Kara } 2755884d179dSJan Kara 275674a8a103SEric W. Biederman int dquot_set_dqblk(struct super_block *sb, struct kqid qid, 275714bf61ffSJan Kara struct qc_dqblk *di) 2758884d179dSJan Kara { 2759884d179dSJan Kara struct dquot *dquot; 2760884d179dSJan Kara int rc; 2761884d179dSJan Kara 2762aca645a6SEric W. Biederman dquot = dqget(sb, qid); 27636184fc0bSJan Kara if (IS_ERR(dquot)) { 27646184fc0bSJan Kara rc = PTR_ERR(dquot); 2765884d179dSJan Kara goto out; 2766884d179dSJan Kara } 2767884d179dSJan Kara rc = do_set_dqblk(dquot, di); 2768884d179dSJan Kara dqput(dquot); 2769884d179dSJan Kara out: 2770884d179dSJan Kara return rc; 2771884d179dSJan Kara } 2772287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_set_dqblk); 2773884d179dSJan Kara 2774884d179dSJan Kara /* Generic routine for getting common part of quota file information */ 27750a240339SJan Kara int dquot_get_state(struct super_block *sb, struct qc_state *state) 2776884d179dSJan Kara { 2777884d179dSJan Kara struct mem_dqinfo *mi; 27780a240339SJan Kara struct qc_type_state *tstate; 27790a240339SJan Kara struct quota_info *dqopt = sb_dqopt(sb); 27800a240339SJan Kara int type; 2781884d179dSJan Kara 27820a240339SJan Kara memset(state, 0, sizeof(*state)); 27830a240339SJan Kara for (type = 0; type < MAXQUOTAS; type++) { 27840a240339SJan Kara if (!sb_has_quota_active(sb, type)) 27850a240339SJan Kara continue; 27860a240339SJan Kara tstate = state->s_state + type; 2787884d179dSJan Kara mi = sb_dqopt(sb)->info + type; 27880a240339SJan Kara tstate->flags = QCI_ACCT_ENABLED; 2789884d179dSJan Kara spin_lock(&dq_data_lock); 27900a240339SJan Kara if (mi->dqi_flags & DQF_SYS_FILE) 27910a240339SJan Kara tstate->flags |= QCI_SYSFILE; 27920a240339SJan Kara if (mi->dqi_flags & DQF_ROOT_SQUASH) 27930a240339SJan Kara tstate->flags |= QCI_ROOT_SQUASH; 27940a240339SJan Kara if (sb_has_quota_limits_enabled(sb, type)) 27950a240339SJan Kara tstate->flags |= QCI_LIMITS_ENFORCED; 27960a240339SJan Kara tstate->spc_timelimit = mi->dqi_bgrace; 27970a240339SJan Kara tstate->ino_timelimit = mi->dqi_igrace; 27980a240339SJan Kara tstate->ino = dqopt->files[type]->i_ino; 27990a240339SJan Kara tstate->blocks = dqopt->files[type]->i_blocks; 28000a240339SJan Kara tstate->nextents = 1; /* We don't know... */ 2801884d179dSJan Kara spin_unlock(&dq_data_lock); 28020a240339SJan Kara } 2803884d179dSJan Kara return 0; 2804884d179dSJan Kara } 28050a240339SJan Kara EXPORT_SYMBOL(dquot_get_state); 2806884d179dSJan Kara 2807884d179dSJan Kara /* Generic routine for setting common part of quota file information */ 28085eacb2acSJan Kara int dquot_set_dqinfo(struct super_block *sb, int type, struct qc_info *ii) 2809884d179dSJan Kara { 2810884d179dSJan Kara struct mem_dqinfo *mi; 2811884d179dSJan Kara int err = 0; 2812884d179dSJan Kara 28135eacb2acSJan Kara if ((ii->i_fieldmask & QC_WARNS_MASK) || 28145eacb2acSJan Kara (ii->i_fieldmask & QC_RT_SPC_TIMER)) 28155eacb2acSJan Kara return -EINVAL; 28169d1ccbe7SJan Kara if (!sb_has_quota_active(sb, type)) 28179d1ccbe7SJan Kara return -ESRCH; 2818884d179dSJan Kara mi = sb_dqopt(sb)->info + type; 28195eacb2acSJan Kara if (ii->i_fieldmask & QC_FLAGS) { 28205eacb2acSJan Kara if ((ii->i_flags & QCI_ROOT_SQUASH && 28219d1ccbe7SJan Kara mi->dqi_format->qf_fmt_id != QFMT_VFS_OLD)) 28229d1ccbe7SJan Kara return -EINVAL; 2823ca6cb091SJan Kara } 2824884d179dSJan Kara spin_lock(&dq_data_lock); 28255eacb2acSJan Kara if (ii->i_fieldmask & QC_SPC_TIMER) 28265eacb2acSJan Kara mi->dqi_bgrace = ii->i_spc_timelimit; 28275eacb2acSJan Kara if (ii->i_fieldmask & QC_INO_TIMER) 28285eacb2acSJan Kara mi->dqi_igrace = ii->i_ino_timelimit; 28295eacb2acSJan Kara if (ii->i_fieldmask & QC_FLAGS) { 28305eacb2acSJan Kara if (ii->i_flags & QCI_ROOT_SQUASH) 28315eacb2acSJan Kara mi->dqi_flags |= DQF_ROOT_SQUASH; 28325eacb2acSJan Kara else 28335eacb2acSJan Kara mi->dqi_flags &= ~DQF_ROOT_SQUASH; 28345eacb2acSJan Kara } 2835884d179dSJan Kara spin_unlock(&dq_data_lock); 2836884d179dSJan Kara mark_info_dirty(sb, type); 2837884d179dSJan Kara /* Force write to disk */ 2838884d179dSJan Kara sb->dq_op->write_info(sb, type); 2839884d179dSJan Kara return err; 2840884d179dSJan Kara } 2841287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_set_dqinfo); 2842884d179dSJan Kara 28433e2af67eSJan Kara const struct quotactl_ops dquot_quotactl_sysfile_ops = { 28443e2af67eSJan Kara .quota_enable = dquot_quota_enable, 28453e2af67eSJan Kara .quota_disable = dquot_quota_disable, 28463e2af67eSJan Kara .quota_sync = dquot_quota_sync, 28470a240339SJan Kara .get_state = dquot_get_state, 28483e2af67eSJan Kara .set_info = dquot_set_dqinfo, 28493e2af67eSJan Kara .get_dqblk = dquot_get_dqblk, 2850be6257b2SJan Kara .get_nextdqblk = dquot_get_next_dqblk, 28513e2af67eSJan Kara .set_dqblk = dquot_set_dqblk 28523e2af67eSJan Kara }; 28533e2af67eSJan Kara EXPORT_SYMBOL(dquot_quotactl_sysfile_ops); 28543e2af67eSJan Kara 2855dde95888SDmitry Monakhov static int do_proc_dqstats(struct ctl_table *table, int write, 2856dde95888SDmitry Monakhov void __user *buffer, size_t *lenp, loff_t *ppos) 2857dde95888SDmitry Monakhov { 2858dde95888SDmitry Monakhov unsigned int type = (int *)table->data - dqstats.stat; 2859f32764bdSDmitry Monakhov 2860f32764bdSDmitry Monakhov /* Update global table */ 2861f32764bdSDmitry Monakhov dqstats.stat[type] = 2862f32764bdSDmitry Monakhov percpu_counter_sum_positive(&dqstats.counter[type]); 2863dde95888SDmitry Monakhov return proc_dointvec(table, write, buffer, lenp, ppos); 2864dde95888SDmitry Monakhov } 2865dde95888SDmitry Monakhov 2866e628753bSJoe Perches static struct ctl_table fs_dqstats_table[] = { 2867884d179dSJan Kara { 2868884d179dSJan Kara .procname = "lookups", 2869dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_LOOKUPS], 2870884d179dSJan Kara .maxlen = sizeof(int), 2871884d179dSJan Kara .mode = 0444, 2872dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2873884d179dSJan Kara }, 2874884d179dSJan Kara { 2875884d179dSJan Kara .procname = "drops", 2876dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_DROPS], 2877884d179dSJan Kara .maxlen = sizeof(int), 2878884d179dSJan Kara .mode = 0444, 2879dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2880884d179dSJan Kara }, 2881884d179dSJan Kara { 2882884d179dSJan Kara .procname = "reads", 2883dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_READS], 2884884d179dSJan Kara .maxlen = sizeof(int), 2885884d179dSJan Kara .mode = 0444, 2886dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2887884d179dSJan Kara }, 2888884d179dSJan Kara { 2889884d179dSJan Kara .procname = "writes", 2890dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_WRITES], 2891884d179dSJan Kara .maxlen = sizeof(int), 2892884d179dSJan Kara .mode = 0444, 2893dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2894884d179dSJan Kara }, 2895884d179dSJan Kara { 2896884d179dSJan Kara .procname = "cache_hits", 2897dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_CACHE_HITS], 2898884d179dSJan Kara .maxlen = sizeof(int), 2899884d179dSJan Kara .mode = 0444, 2900dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2901884d179dSJan Kara }, 2902884d179dSJan Kara { 2903884d179dSJan Kara .procname = "allocated_dquots", 2904dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_ALLOC_DQUOTS], 2905884d179dSJan Kara .maxlen = sizeof(int), 2906884d179dSJan Kara .mode = 0444, 2907dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2908884d179dSJan Kara }, 2909884d179dSJan Kara { 2910884d179dSJan Kara .procname = "free_dquots", 2911dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_FREE_DQUOTS], 2912884d179dSJan Kara .maxlen = sizeof(int), 2913884d179dSJan Kara .mode = 0444, 2914dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2915884d179dSJan Kara }, 2916884d179dSJan Kara { 2917884d179dSJan Kara .procname = "syncs", 2918dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_SYNCS], 2919884d179dSJan Kara .maxlen = sizeof(int), 2920884d179dSJan Kara .mode = 0444, 2921dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2922884d179dSJan Kara }, 2923884d179dSJan Kara #ifdef CONFIG_PRINT_QUOTA_WARNING 2924884d179dSJan Kara { 2925884d179dSJan Kara .procname = "warnings", 2926884d179dSJan Kara .data = &flag_print_warnings, 2927884d179dSJan Kara .maxlen = sizeof(int), 2928884d179dSJan Kara .mode = 0644, 29296d456111SEric W. Biederman .proc_handler = proc_dointvec, 2930884d179dSJan Kara }, 2931884d179dSJan Kara #endif 2932ab09203eSEric W. Biederman { }, 2933884d179dSJan Kara }; 2934884d179dSJan Kara 2935e628753bSJoe Perches static struct ctl_table fs_table[] = { 2936884d179dSJan Kara { 2937884d179dSJan Kara .procname = "quota", 2938884d179dSJan Kara .mode = 0555, 2939884d179dSJan Kara .child = fs_dqstats_table, 2940884d179dSJan Kara }, 2941ab09203eSEric W. Biederman { }, 2942884d179dSJan Kara }; 2943884d179dSJan Kara 2944e628753bSJoe Perches static struct ctl_table sys_table[] = { 2945884d179dSJan Kara { 2946884d179dSJan Kara .procname = "fs", 2947884d179dSJan Kara .mode = 0555, 2948884d179dSJan Kara .child = fs_table, 2949884d179dSJan Kara }, 2950ab09203eSEric W. Biederman { }, 2951884d179dSJan Kara }; 2952884d179dSJan Kara 2953884d179dSJan Kara static int __init dquot_init(void) 2954884d179dSJan Kara { 2955f32764bdSDmitry Monakhov int i, ret; 2956884d179dSJan Kara unsigned long nr_hash, order; 2957884d179dSJan Kara 2958884d179dSJan Kara printk(KERN_NOTICE "VFS: Disk quotas %s\n", __DQUOT_VERSION__); 2959884d179dSJan Kara 2960884d179dSJan Kara register_sysctl_table(sys_table); 2961884d179dSJan Kara 2962884d179dSJan Kara dquot_cachep = kmem_cache_create("dquot", 2963884d179dSJan Kara sizeof(struct dquot), sizeof(unsigned long) * 4, 2964884d179dSJan Kara (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| 2965884d179dSJan Kara SLAB_MEM_SPREAD|SLAB_PANIC), 2966884d179dSJan Kara NULL); 2967884d179dSJan Kara 2968884d179dSJan Kara order = 0; 2969884d179dSJan Kara dquot_hash = (struct hlist_head *)__get_free_pages(GFP_ATOMIC, order); 2970884d179dSJan Kara if (!dquot_hash) 2971884d179dSJan Kara panic("Cannot create dquot hash table"); 2972884d179dSJan Kara 2973f32764bdSDmitry Monakhov for (i = 0; i < _DQST_DQSTAT_LAST; i++) { 2974908c7f19STejun Heo ret = percpu_counter_init(&dqstats.counter[i], 0, GFP_KERNEL); 2975f32764bdSDmitry Monakhov if (ret) 2976f32764bdSDmitry Monakhov panic("Cannot create dquot stat counters"); 2977f32764bdSDmitry Monakhov } 2978dde95888SDmitry Monakhov 2979884d179dSJan Kara /* Find power-of-two hlist_heads which can fit into allocation */ 2980884d179dSJan Kara nr_hash = (1UL << order) * PAGE_SIZE / sizeof(struct hlist_head); 2981884d179dSJan Kara dq_hash_bits = 0; 2982884d179dSJan Kara do { 2983884d179dSJan Kara dq_hash_bits++; 2984884d179dSJan Kara } while (nr_hash >> dq_hash_bits); 2985884d179dSJan Kara dq_hash_bits--; 2986884d179dSJan Kara 2987884d179dSJan Kara nr_hash = 1UL << dq_hash_bits; 2988884d179dSJan Kara dq_hash_mask = nr_hash - 1; 2989884d179dSJan Kara for (i = 0; i < nr_hash; i++) 2990884d179dSJan Kara INIT_HLIST_HEAD(dquot_hash + i); 2991884d179dSJan Kara 299219858e7bSAnton Blanchard pr_info("VFS: Dquot-cache hash table entries: %ld (order %ld," 299319858e7bSAnton Blanchard " %ld bytes)\n", nr_hash, order, (PAGE_SIZE << order)); 2994884d179dSJan Kara 2995*88bc0edeSTetsuo Handa if (register_shrinker(&dqcache_shrinker)) 2996*88bc0edeSTetsuo Handa panic("Cannot register dquot shrinker"); 2997884d179dSJan Kara 2998884d179dSJan Kara return 0; 2999884d179dSJan Kara } 3000331221faSPaul Gortmaker fs_initcall(dquot_init); 3001