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: 226f44840adSChengguang Xu * The quota code uses four lists for dquot management: the inuse_list, 227f44840adSChengguang Xu * free_dquots, dqi_dirty_list, and dquot_hash[] array. A single dquot 228f44840adSChengguang Xu * structure may be on some of those 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 * 239f44840adSChengguang Xu * Dirty dquots are added to the dqi_dirty_list of quota_info when mark 240f44840adSChengguang Xu * dirtied, and this list is searched when writing dirty dquots back to 241f44840adSChengguang Xu * quota file. Note that some filesystems do dirty dquot tracking on their 242f44840adSChengguang Xu * own (e.g. in a journal) and thus don't use dqi_dirty_list. 243f44840adSChengguang Xu * 244884d179dSJan Kara * Dquots with a specific identity (device, type and id) are placed on 245884d179dSJan Kara * one of the dquot_hash[] hash chains. The provides an efficient search 246884d179dSJan Kara * mechanism to locate a specific dquot. 247884d179dSJan Kara */ 248884d179dSJan Kara 249884d179dSJan Kara static LIST_HEAD(inuse_list); 250884d179dSJan Kara static LIST_HEAD(free_dquots); 251884d179dSJan Kara static unsigned int dq_hash_bits, dq_hash_mask; 252884d179dSJan Kara static struct hlist_head *dquot_hash; 253884d179dSJan Kara 254884d179dSJan Kara struct dqstats dqstats; 255884d179dSJan Kara EXPORT_SYMBOL(dqstats); 256884d179dSJan Kara 2570a5a9c72SJan Kara static qsize_t inode_get_rsv_space(struct inode *inode); 2587b9ca4c6SJan Kara static qsize_t __inode_get_rsv_space(struct inode *inode); 2596184fc0bSJan Kara static int __dquot_initialize(struct inode *inode, int type); 2600a5a9c72SJan Kara 261884d179dSJan Kara static inline unsigned int 2621a06d420SEric W. Biederman hashfn(const struct super_block *sb, struct kqid qid) 263884d179dSJan Kara { 2641a06d420SEric W. Biederman unsigned int id = from_kqid(&init_user_ns, qid); 2651a06d420SEric W. Biederman int type = qid.type; 266884d179dSJan Kara unsigned long tmp; 267884d179dSJan Kara 268884d179dSJan Kara tmp = (((unsigned long)sb>>L1_CACHE_SHIFT) ^ id) * (MAXQUOTAS - type); 269884d179dSJan Kara return (tmp + (tmp >> dq_hash_bits)) & dq_hash_mask; 270884d179dSJan Kara } 271884d179dSJan Kara 272884d179dSJan Kara /* 273884d179dSJan Kara * Following list functions expect dq_list_lock to be held 274884d179dSJan Kara */ 275884d179dSJan Kara static inline void insert_dquot_hash(struct dquot *dquot) 276884d179dSJan Kara { 277268157baSJan Kara struct hlist_head *head; 2781a06d420SEric W. Biederman head = dquot_hash + hashfn(dquot->dq_sb, dquot->dq_id); 279884d179dSJan Kara hlist_add_head(&dquot->dq_hash, head); 280884d179dSJan Kara } 281884d179dSJan Kara 282884d179dSJan Kara static inline void remove_dquot_hash(struct dquot *dquot) 283884d179dSJan Kara { 284884d179dSJan Kara hlist_del_init(&dquot->dq_hash); 285884d179dSJan Kara } 286884d179dSJan Kara 2877a2435d8SJan Kara static struct dquot *find_dquot(unsigned int hashent, struct super_block *sb, 2881a06d420SEric W. Biederman struct kqid qid) 289884d179dSJan Kara { 290884d179dSJan Kara struct hlist_node *node; 291884d179dSJan Kara struct dquot *dquot; 292884d179dSJan Kara 293884d179dSJan Kara hlist_for_each (node, dquot_hash+hashent) { 294884d179dSJan Kara dquot = hlist_entry(node, struct dquot, dq_hash); 2954c376dcaSEric W. Biederman if (dquot->dq_sb == sb && qid_eq(dquot->dq_id, qid)) 296884d179dSJan Kara return dquot; 297884d179dSJan Kara } 298dd6f3c6dSJan Kara return NULL; 299884d179dSJan Kara } 300884d179dSJan Kara 301884d179dSJan Kara /* Add a dquot to the tail of the free list */ 302884d179dSJan Kara static inline void put_dquot_last(struct dquot *dquot) 303884d179dSJan Kara { 304884d179dSJan Kara list_add_tail(&dquot->dq_free, &free_dquots); 305dde95888SDmitry Monakhov dqstats_inc(DQST_FREE_DQUOTS); 306884d179dSJan Kara } 307884d179dSJan Kara 308884d179dSJan Kara static inline void remove_free_dquot(struct dquot *dquot) 309884d179dSJan Kara { 310884d179dSJan Kara if (list_empty(&dquot->dq_free)) 311884d179dSJan Kara return; 312884d179dSJan Kara list_del_init(&dquot->dq_free); 313dde95888SDmitry Monakhov dqstats_dec(DQST_FREE_DQUOTS); 314884d179dSJan Kara } 315884d179dSJan Kara 316884d179dSJan Kara static inline void put_inuse(struct dquot *dquot) 317884d179dSJan Kara { 318884d179dSJan Kara /* We add to the back of inuse list so we don't have to restart 319884d179dSJan Kara * when traversing this list and we block */ 320884d179dSJan Kara list_add_tail(&dquot->dq_inuse, &inuse_list); 321dde95888SDmitry Monakhov dqstats_inc(DQST_ALLOC_DQUOTS); 322884d179dSJan Kara } 323884d179dSJan Kara 324884d179dSJan Kara static inline void remove_inuse(struct dquot *dquot) 325884d179dSJan Kara { 326dde95888SDmitry Monakhov dqstats_dec(DQST_ALLOC_DQUOTS); 327884d179dSJan Kara list_del(&dquot->dq_inuse); 328884d179dSJan Kara } 329884d179dSJan Kara /* 330884d179dSJan Kara * End of list functions needing dq_list_lock 331884d179dSJan Kara */ 332884d179dSJan Kara 333884d179dSJan Kara static void wait_on_dquot(struct dquot *dquot) 334884d179dSJan Kara { 335884d179dSJan Kara mutex_lock(&dquot->dq_lock); 336884d179dSJan Kara mutex_unlock(&dquot->dq_lock); 337884d179dSJan Kara } 338884d179dSJan Kara 339884d179dSJan Kara static inline int dquot_dirty(struct dquot *dquot) 340884d179dSJan Kara { 341884d179dSJan Kara return test_bit(DQ_MOD_B, &dquot->dq_flags); 342884d179dSJan Kara } 343884d179dSJan Kara 344884d179dSJan Kara static inline int mark_dquot_dirty(struct dquot *dquot) 345884d179dSJan Kara { 346884d179dSJan Kara return dquot->dq_sb->dq_op->mark_dirty(dquot); 347884d179dSJan Kara } 348884d179dSJan Kara 349eabf290dSDmitry Monakhov /* Mark dquot dirty in atomic manner, and return it's old dirty flag state */ 350884d179dSJan Kara int dquot_mark_dquot_dirty(struct dquot *dquot) 351884d179dSJan Kara { 352eabf290dSDmitry Monakhov int ret = 1; 353eabf290dSDmitry Monakhov 3544580b30eSJan Kara if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) 3554580b30eSJan Kara return 0; 3564580b30eSJan Kara 357834057bfSJan Kara if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NOLIST_DIRTY) 358834057bfSJan Kara return test_and_set_bit(DQ_MOD_B, &dquot->dq_flags); 359834057bfSJan Kara 360eabf290dSDmitry Monakhov /* If quota is dirty already, we don't have to acquire dq_list_lock */ 361eabf290dSDmitry Monakhov if (test_bit(DQ_MOD_B, &dquot->dq_flags)) 362eabf290dSDmitry Monakhov return 1; 363eabf290dSDmitry Monakhov 364884d179dSJan Kara spin_lock(&dq_list_lock); 365eabf290dSDmitry Monakhov if (!test_and_set_bit(DQ_MOD_B, &dquot->dq_flags)) { 366884d179dSJan Kara list_add(&dquot->dq_dirty, &sb_dqopt(dquot->dq_sb)-> 3674c376dcaSEric W. Biederman info[dquot->dq_id.type].dqi_dirty_list); 368eabf290dSDmitry Monakhov ret = 0; 369eabf290dSDmitry Monakhov } 370884d179dSJan Kara spin_unlock(&dq_list_lock); 371eabf290dSDmitry Monakhov return ret; 372884d179dSJan Kara } 373884d179dSJan Kara EXPORT_SYMBOL(dquot_mark_dquot_dirty); 374884d179dSJan Kara 375dc52dd3aSDmitry Monakhov /* Dirtify all the dquots - this can block when journalling */ 376dc52dd3aSDmitry Monakhov static inline int mark_all_dquot_dirty(struct dquot * const *dquot) 377dc52dd3aSDmitry Monakhov { 378dc52dd3aSDmitry Monakhov int ret, err, cnt; 379dc52dd3aSDmitry Monakhov 380dc52dd3aSDmitry Monakhov ret = err = 0; 381dc52dd3aSDmitry Monakhov for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 382dc52dd3aSDmitry Monakhov if (dquot[cnt]) 383dc52dd3aSDmitry Monakhov /* Even in case of error we have to continue */ 384dc52dd3aSDmitry Monakhov ret = mark_dquot_dirty(dquot[cnt]); 385dc52dd3aSDmitry Monakhov if (!err) 386dc52dd3aSDmitry Monakhov err = ret; 387dc52dd3aSDmitry Monakhov } 388dc52dd3aSDmitry Monakhov return err; 389dc52dd3aSDmitry Monakhov } 390dc52dd3aSDmitry Monakhov 391dc52dd3aSDmitry Monakhov static inline void dqput_all(struct dquot **dquot) 392dc52dd3aSDmitry Monakhov { 393dc52dd3aSDmitry Monakhov unsigned int cnt; 394dc52dd3aSDmitry Monakhov 395dc52dd3aSDmitry Monakhov for (cnt = 0; cnt < MAXQUOTAS; cnt++) 396dc52dd3aSDmitry Monakhov dqput(dquot[cnt]); 397dc52dd3aSDmitry Monakhov } 398dc52dd3aSDmitry Monakhov 399884d179dSJan Kara static inline int clear_dquot_dirty(struct dquot *dquot) 400884d179dSJan Kara { 401834057bfSJan Kara if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NOLIST_DIRTY) 402834057bfSJan Kara return test_and_clear_bit(DQ_MOD_B, &dquot->dq_flags); 403834057bfSJan Kara 4041e0b7cb0SJan Kara spin_lock(&dq_list_lock); 4051e0b7cb0SJan Kara if (!test_and_clear_bit(DQ_MOD_B, &dquot->dq_flags)) { 4061e0b7cb0SJan Kara spin_unlock(&dq_list_lock); 407884d179dSJan Kara return 0; 4081e0b7cb0SJan Kara } 409884d179dSJan Kara list_del_init(&dquot->dq_dirty); 4101e0b7cb0SJan Kara spin_unlock(&dq_list_lock); 411884d179dSJan Kara return 1; 412884d179dSJan Kara } 413884d179dSJan Kara 414884d179dSJan Kara void mark_info_dirty(struct super_block *sb, int type) 415884d179dSJan Kara { 41615512377SJan Kara spin_lock(&dq_data_lock); 41715512377SJan Kara sb_dqopt(sb)->info[type].dqi_flags |= DQF_INFO_DIRTY; 41815512377SJan Kara spin_unlock(&dq_data_lock); 419884d179dSJan Kara } 420884d179dSJan Kara EXPORT_SYMBOL(mark_info_dirty); 421884d179dSJan Kara 422884d179dSJan Kara /* 423884d179dSJan Kara * Read dquot from disk and alloc space for it 424884d179dSJan Kara */ 425884d179dSJan Kara 426884d179dSJan Kara int dquot_acquire(struct dquot *dquot) 427884d179dSJan Kara { 428884d179dSJan Kara int ret = 0, ret2 = 0; 429884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); 430884d179dSJan Kara 431884d179dSJan Kara mutex_lock(&dquot->dq_lock); 4323ef177ecSChengguang Xu if (!test_bit(DQ_READ_B, &dquot->dq_flags)) { 4334c376dcaSEric W. Biederman ret = dqopt->ops[dquot->dq_id.type]->read_dqblk(dquot); 434884d179dSJan Kara if (ret < 0) 435884d179dSJan Kara goto out_iolock; 4363ef177ecSChengguang Xu } 437044c9b67SJan Kara /* Make sure flags update is visible after dquot has been filled */ 438044c9b67SJan Kara smp_mb__before_atomic(); 439884d179dSJan Kara set_bit(DQ_READ_B, &dquot->dq_flags); 440884d179dSJan Kara /* Instantiate dquot if needed */ 441884d179dSJan Kara if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && !dquot->dq_off) { 4424c376dcaSEric W. Biederman ret = dqopt->ops[dquot->dq_id.type]->commit_dqblk(dquot); 443884d179dSJan Kara /* Write the info if needed */ 4444c376dcaSEric W. Biederman if (info_dirty(&dqopt->info[dquot->dq_id.type])) { 4454c376dcaSEric W. Biederman ret2 = dqopt->ops[dquot->dq_id.type]->write_file_info( 4464c376dcaSEric W. Biederman dquot->dq_sb, dquot->dq_id.type); 447268157baSJan Kara } 448884d179dSJan Kara if (ret < 0) 449884d179dSJan Kara goto out_iolock; 450884d179dSJan Kara if (ret2 < 0) { 451884d179dSJan Kara ret = ret2; 452884d179dSJan Kara goto out_iolock; 453884d179dSJan Kara } 454884d179dSJan Kara } 455044c9b67SJan Kara /* 456044c9b67SJan Kara * Make sure flags update is visible after on-disk struct has been 457044c9b67SJan Kara * allocated. Paired with smp_rmb() in dqget(). 458044c9b67SJan Kara */ 459044c9b67SJan Kara smp_mb__before_atomic(); 460884d179dSJan Kara set_bit(DQ_ACTIVE_B, &dquot->dq_flags); 461884d179dSJan Kara out_iolock: 462884d179dSJan Kara mutex_unlock(&dquot->dq_lock); 463884d179dSJan Kara return ret; 464884d179dSJan Kara } 465884d179dSJan Kara EXPORT_SYMBOL(dquot_acquire); 466884d179dSJan Kara 467884d179dSJan Kara /* 468884d179dSJan Kara * Write dquot to disk 469884d179dSJan Kara */ 470884d179dSJan Kara int dquot_commit(struct dquot *dquot) 471884d179dSJan Kara { 472b03f2456SJan Kara int ret = 0; 473884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); 474884d179dSJan Kara 4755e8cb9b6SJan Kara mutex_lock(&dquot->dq_lock); 4761e0b7cb0SJan Kara if (!clear_dquot_dirty(dquot)) 4775e8cb9b6SJan Kara goto out_lock; 478884d179dSJan Kara /* Inactive dquot can be only if there was error during read/init 479884d179dSJan Kara * => we have better not writing it */ 480b03f2456SJan Kara if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) 4814c376dcaSEric W. Biederman ret = dqopt->ops[dquot->dq_id.type]->commit_dqblk(dquot); 482b03f2456SJan Kara else 483b03f2456SJan Kara ret = -EIO; 4845e8cb9b6SJan Kara out_lock: 4855e8cb9b6SJan Kara mutex_unlock(&dquot->dq_lock); 486884d179dSJan Kara return ret; 487884d179dSJan Kara } 488884d179dSJan Kara EXPORT_SYMBOL(dquot_commit); 489884d179dSJan Kara 490884d179dSJan Kara /* 491884d179dSJan Kara * Release dquot 492884d179dSJan Kara */ 493884d179dSJan Kara int dquot_release(struct dquot *dquot) 494884d179dSJan Kara { 495884d179dSJan Kara int ret = 0, ret2 = 0; 496884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); 497884d179dSJan Kara 498884d179dSJan Kara mutex_lock(&dquot->dq_lock); 499884d179dSJan Kara /* Check whether we are not racing with some other dqget() */ 500884d179dSJan Kara if (atomic_read(&dquot->dq_count) > 1) 501884d179dSJan Kara goto out_dqlock; 5024c376dcaSEric W. Biederman if (dqopt->ops[dquot->dq_id.type]->release_dqblk) { 5034c376dcaSEric W. Biederman ret = dqopt->ops[dquot->dq_id.type]->release_dqblk(dquot); 504884d179dSJan Kara /* Write the info */ 5054c376dcaSEric W. Biederman if (info_dirty(&dqopt->info[dquot->dq_id.type])) { 5064c376dcaSEric W. Biederman ret2 = dqopt->ops[dquot->dq_id.type]->write_file_info( 5074c376dcaSEric W. Biederman dquot->dq_sb, dquot->dq_id.type); 508268157baSJan Kara } 509884d179dSJan Kara if (ret >= 0) 510884d179dSJan Kara ret = ret2; 511884d179dSJan Kara } 512884d179dSJan Kara clear_bit(DQ_ACTIVE_B, &dquot->dq_flags); 513884d179dSJan Kara out_dqlock: 514884d179dSJan Kara mutex_unlock(&dquot->dq_lock); 515884d179dSJan Kara return ret; 516884d179dSJan Kara } 517884d179dSJan Kara EXPORT_SYMBOL(dquot_release); 518884d179dSJan Kara 519884d179dSJan Kara void dquot_destroy(struct dquot *dquot) 520884d179dSJan Kara { 521884d179dSJan Kara kmem_cache_free(dquot_cachep, dquot); 522884d179dSJan Kara } 523884d179dSJan Kara EXPORT_SYMBOL(dquot_destroy); 524884d179dSJan Kara 525884d179dSJan Kara static inline void do_destroy_dquot(struct dquot *dquot) 526884d179dSJan Kara { 527884d179dSJan Kara dquot->dq_sb->dq_op->destroy_dquot(dquot); 528884d179dSJan Kara } 529884d179dSJan Kara 530884d179dSJan Kara /* Invalidate all dquots on the list. Note that this function is called after 531884d179dSJan Kara * quota is disabled and pointers from inodes removed so there cannot be new 532884d179dSJan Kara * quota users. There can still be some users of quotas due to inodes being 533884d179dSJan Kara * just deleted or pruned by prune_icache() (those are not attached to any 534884d179dSJan Kara * list) or parallel quotactl call. We have to wait for such users. 535884d179dSJan Kara */ 536884d179dSJan Kara static void invalidate_dquots(struct super_block *sb, int type) 537884d179dSJan Kara { 538884d179dSJan Kara struct dquot *dquot, *tmp; 539884d179dSJan Kara 540884d179dSJan Kara restart: 541884d179dSJan Kara spin_lock(&dq_list_lock); 542884d179dSJan Kara list_for_each_entry_safe(dquot, tmp, &inuse_list, dq_inuse) { 543884d179dSJan Kara if (dquot->dq_sb != sb) 544884d179dSJan Kara continue; 5454c376dcaSEric W. Biederman if (dquot->dq_id.type != type) 546884d179dSJan Kara continue; 547884d179dSJan Kara /* Wait for dquot users */ 548884d179dSJan Kara if (atomic_read(&dquot->dq_count)) { 5499f985cb6SJan Kara dqgrab(dquot); 550884d179dSJan Kara spin_unlock(&dq_list_lock); 551503330f3SJan Kara /* 552503330f3SJan Kara * Once dqput() wakes us up, we know it's time to free 553884d179dSJan Kara * the dquot. 554884d179dSJan Kara * IMPORTANT: we rely on the fact that there is always 555884d179dSJan Kara * at most one process waiting for dquot to free. 556884d179dSJan Kara * Otherwise dq_count would be > 1 and we would never 557884d179dSJan Kara * wake up. 558884d179dSJan Kara */ 559503330f3SJan Kara wait_event(dquot_ref_wq, 560503330f3SJan Kara atomic_read(&dquot->dq_count) == 1); 561884d179dSJan Kara dqput(dquot); 562884d179dSJan Kara /* At this moment dquot() need not exist (it could be 563884d179dSJan Kara * reclaimed by prune_dqcache(). Hence we must 564884d179dSJan Kara * restart. */ 565884d179dSJan Kara goto restart; 566884d179dSJan Kara } 567884d179dSJan Kara /* 568884d179dSJan Kara * Quota now has no users and it has been written on last 569884d179dSJan Kara * dqput() 570884d179dSJan Kara */ 571884d179dSJan Kara remove_dquot_hash(dquot); 572884d179dSJan Kara remove_free_dquot(dquot); 573884d179dSJan Kara remove_inuse(dquot); 574884d179dSJan Kara do_destroy_dquot(dquot); 575884d179dSJan Kara } 576884d179dSJan Kara spin_unlock(&dq_list_lock); 577884d179dSJan Kara } 578884d179dSJan Kara 579884d179dSJan Kara /* Call callback for every active dquot on given filesystem */ 580884d179dSJan Kara int dquot_scan_active(struct super_block *sb, 581884d179dSJan Kara int (*fn)(struct dquot *dquot, unsigned long priv), 582884d179dSJan Kara unsigned long priv) 583884d179dSJan Kara { 584884d179dSJan Kara struct dquot *dquot, *old_dquot = NULL; 585884d179dSJan Kara int ret = 0; 586884d179dSJan Kara 587ee1ac541SJan Kara WARN_ON_ONCE(!rwsem_is_locked(&sb->s_umount)); 588ee1ac541SJan Kara 589884d179dSJan Kara spin_lock(&dq_list_lock); 590884d179dSJan Kara list_for_each_entry(dquot, &inuse_list, dq_inuse) { 591884d179dSJan Kara if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) 592884d179dSJan Kara continue; 593884d179dSJan Kara if (dquot->dq_sb != sb) 594884d179dSJan Kara continue; 595884d179dSJan Kara /* Now we have active dquot so we can just increase use count */ 596884d179dSJan Kara atomic_inc(&dquot->dq_count); 597884d179dSJan Kara spin_unlock(&dq_list_lock); 598dde95888SDmitry Monakhov dqstats_inc(DQST_LOOKUPS); 599884d179dSJan Kara dqput(old_dquot); 600884d179dSJan Kara old_dquot = dquot; 6011362f4eaSJan Kara /* 6021362f4eaSJan Kara * ->release_dquot() can be racing with us. Our reference 6031362f4eaSJan Kara * protects us from new calls to it so just wait for any 6041362f4eaSJan Kara * outstanding call and recheck the DQ_ACTIVE_B after that. 6051362f4eaSJan Kara */ 6061362f4eaSJan Kara wait_on_dquot(dquot); 6071362f4eaSJan Kara if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { 608884d179dSJan Kara ret = fn(dquot, priv); 609884d179dSJan Kara if (ret < 0) 610884d179dSJan Kara goto out; 6111362f4eaSJan Kara } 612884d179dSJan Kara spin_lock(&dq_list_lock); 613884d179dSJan Kara /* We are safe to continue now because our dquot could not 614884d179dSJan Kara * be moved out of the inuse list while we hold the reference */ 615884d179dSJan Kara } 616884d179dSJan Kara spin_unlock(&dq_list_lock); 617884d179dSJan Kara out: 618884d179dSJan Kara dqput(old_dquot); 619884d179dSJan Kara return ret; 620884d179dSJan Kara } 621884d179dSJan Kara EXPORT_SYMBOL(dquot_scan_active); 622884d179dSJan Kara 623ceed1723SJan Kara /* Write all dquot structures to quota files */ 624ceed1723SJan Kara int dquot_writeback_dquots(struct super_block *sb, int type) 625884d179dSJan Kara { 626884d179dSJan Kara struct list_head *dirty; 627884d179dSJan Kara struct dquot *dquot; 628884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 629884d179dSJan Kara int cnt; 630ceed1723SJan Kara int err, ret = 0; 631884d179dSJan Kara 6329d1ccbe7SJan Kara WARN_ON_ONCE(!rwsem_is_locked(&sb->s_umount)); 6339d1ccbe7SJan Kara 634884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 635884d179dSJan Kara if (type != -1 && cnt != type) 636884d179dSJan Kara continue; 637884d179dSJan Kara if (!sb_has_quota_active(sb, cnt)) 638884d179dSJan Kara continue; 639884d179dSJan Kara spin_lock(&dq_list_lock); 640884d179dSJan Kara dirty = &dqopt->info[cnt].dqi_dirty_list; 641884d179dSJan Kara while (!list_empty(dirty)) { 642268157baSJan Kara dquot = list_first_entry(dirty, struct dquot, 643268157baSJan Kara dq_dirty); 6444580b30eSJan Kara 6454580b30eSJan Kara WARN_ON(!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)); 6464580b30eSJan Kara 647884d179dSJan Kara /* Now we have active dquot from which someone is 648884d179dSJan Kara * holding reference so we can safely just increase 649884d179dSJan Kara * use count */ 6509f985cb6SJan Kara dqgrab(dquot); 651884d179dSJan Kara spin_unlock(&dq_list_lock); 652dde95888SDmitry Monakhov dqstats_inc(DQST_LOOKUPS); 653ceed1723SJan Kara err = sb->dq_op->write_dquot(dquot); 654dd5f6279Szhangyi (F) if (err) { 655dd5f6279Szhangyi (F) /* 656dd5f6279Szhangyi (F) * Clear dirty bit anyway to avoid infinite 657dd5f6279Szhangyi (F) * loop here. 658dd5f6279Szhangyi (F) */ 659dd5f6279Szhangyi (F) clear_dquot_dirty(dquot); 660dd5f6279Szhangyi (F) if (!ret) 661474d2605SJan Kara ret = err; 662dd5f6279Szhangyi (F) } 663884d179dSJan Kara dqput(dquot); 664884d179dSJan Kara spin_lock(&dq_list_lock); 665884d179dSJan Kara } 666884d179dSJan Kara spin_unlock(&dq_list_lock); 667884d179dSJan Kara } 668884d179dSJan Kara 669884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 670884d179dSJan Kara if ((cnt == type || type == -1) && sb_has_quota_active(sb, cnt) 671884d179dSJan Kara && info_dirty(&dqopt->info[cnt])) 672884d179dSJan Kara sb->dq_op->write_info(sb, cnt); 673dde95888SDmitry Monakhov dqstats_inc(DQST_SYNCS); 674884d179dSJan Kara 675ceed1723SJan Kara return ret; 676ceed1723SJan Kara } 677ceed1723SJan Kara EXPORT_SYMBOL(dquot_writeback_dquots); 678ceed1723SJan Kara 679ceed1723SJan Kara /* Write all dquot structures to disk and make them visible from userspace */ 680ceed1723SJan Kara int dquot_quota_sync(struct super_block *sb, int type) 681ceed1723SJan Kara { 682ceed1723SJan Kara struct quota_info *dqopt = sb_dqopt(sb); 683ceed1723SJan Kara int cnt; 684ceed1723SJan Kara int ret; 685ceed1723SJan Kara 686ceed1723SJan Kara ret = dquot_writeback_dquots(sb, type); 687ceed1723SJan Kara if (ret) 688ceed1723SJan Kara return ret; 689ceed1723SJan Kara if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) 6905fb324adSChristoph Hellwig return 0; 6915fb324adSChristoph Hellwig 6925fb324adSChristoph Hellwig /* This is not very clever (and fast) but currently I don't know about 6935fb324adSChristoph Hellwig * any other simple way of getting quota data to disk and we must get 6945fb324adSChristoph Hellwig * them there for userspace to be visible... */ 6955fb324adSChristoph Hellwig if (sb->s_op->sync_fs) 6965fb324adSChristoph Hellwig sb->s_op->sync_fs(sb, 1); 6975fb324adSChristoph Hellwig sync_blockdev(sb->s_bdev); 6985fb324adSChristoph Hellwig 6995fb324adSChristoph Hellwig /* 7005fb324adSChristoph Hellwig * Now when everything is written we can discard the pagecache so 7015fb324adSChristoph Hellwig * that userspace sees the changes. 7025fb324adSChristoph Hellwig */ 7035fb324adSChristoph Hellwig for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 7045fb324adSChristoph Hellwig if (type != -1 && cnt != type) 7055fb324adSChristoph Hellwig continue; 7065fb324adSChristoph Hellwig if (!sb_has_quota_active(sb, cnt)) 7075fb324adSChristoph Hellwig continue; 7085955102cSAl Viro inode_lock(dqopt->files[cnt]); 709f9ef1784SJan Kara truncate_inode_pages(&dqopt->files[cnt]->i_data, 0); 7105955102cSAl Viro inode_unlock(dqopt->files[cnt]); 7115fb324adSChristoph Hellwig } 7125fb324adSChristoph Hellwig 713884d179dSJan Kara return 0; 714884d179dSJan Kara } 715287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_quota_sync); 716884d179dSJan Kara 7171ab6c499SDave Chinner static unsigned long 7181ab6c499SDave Chinner dqcache_shrink_scan(struct shrinker *shrink, struct shrink_control *sc) 719884d179dSJan Kara { 720884d179dSJan Kara struct dquot *dquot; 7211ab6c499SDave Chinner unsigned long freed = 0; 722884d179dSJan Kara 723d68aab6bSNiu Yawei spin_lock(&dq_list_lock); 7241822193bSJan Kara while (!list_empty(&free_dquots) && sc->nr_to_scan) { 7251822193bSJan Kara dquot = list_first_entry(&free_dquots, struct dquot, dq_free); 726884d179dSJan Kara remove_dquot_hash(dquot); 727884d179dSJan Kara remove_free_dquot(dquot); 728884d179dSJan Kara remove_inuse(dquot); 729884d179dSJan Kara do_destroy_dquot(dquot); 7301ab6c499SDave Chinner sc->nr_to_scan--; 7311ab6c499SDave Chinner freed++; 732884d179dSJan Kara } 733d68aab6bSNiu Yawei spin_unlock(&dq_list_lock); 7341ab6c499SDave Chinner return freed; 735884d179dSJan Kara } 736884d179dSJan Kara 7371ab6c499SDave Chinner static unsigned long 7381ab6c499SDave Chinner dqcache_shrink_count(struct shrinker *shrink, struct shrink_control *sc) 739884d179dSJan Kara { 74055f841ceSGlauber Costa return vfs_pressure_ratio( 74155f841ceSGlauber Costa percpu_counter_read_positive(&dqstats.counter[DQST_FREE_DQUOTS])); 742884d179dSJan Kara } 743884d179dSJan Kara 744884d179dSJan Kara static struct shrinker dqcache_shrinker = { 7451ab6c499SDave Chinner .count_objects = dqcache_shrink_count, 7461ab6c499SDave Chinner .scan_objects = dqcache_shrink_scan, 747884d179dSJan Kara .seeks = DEFAULT_SEEKS, 748884d179dSJan Kara }; 749884d179dSJan Kara 750884d179dSJan Kara /* 751884d179dSJan Kara * Put reference to dquot 752884d179dSJan Kara */ 753884d179dSJan Kara void dqput(struct dquot *dquot) 754884d179dSJan Kara { 755884d179dSJan Kara int ret; 756884d179dSJan Kara 757884d179dSJan Kara if (!dquot) 758884d179dSJan Kara return; 75962af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 760884d179dSJan Kara if (!atomic_read(&dquot->dq_count)) { 761fb5ffb0eSJiaying Zhang quota_error(dquot->dq_sb, "trying to free free dquot of %s %d", 7624c376dcaSEric W. Biederman quotatypes[dquot->dq_id.type], 7634c376dcaSEric W. Biederman from_kqid(&init_user_ns, dquot->dq_id)); 764884d179dSJan Kara BUG(); 765884d179dSJan Kara } 766884d179dSJan Kara #endif 767dde95888SDmitry Monakhov dqstats_inc(DQST_DROPS); 768884d179dSJan Kara we_slept: 769884d179dSJan Kara spin_lock(&dq_list_lock); 770884d179dSJan Kara if (atomic_read(&dquot->dq_count) > 1) { 771884d179dSJan Kara /* We have more than one user... nothing to do */ 772884d179dSJan Kara atomic_dec(&dquot->dq_count); 773884d179dSJan Kara /* Releasing dquot during quotaoff phase? */ 7744c376dcaSEric W. Biederman if (!sb_has_quota_active(dquot->dq_sb, dquot->dq_id.type) && 775884d179dSJan Kara atomic_read(&dquot->dq_count) == 1) 776503330f3SJan Kara wake_up(&dquot_ref_wq); 777884d179dSJan Kara spin_unlock(&dq_list_lock); 778884d179dSJan Kara return; 779884d179dSJan Kara } 780884d179dSJan Kara /* Need to release dquot? */ 7814580b30eSJan Kara if (dquot_dirty(dquot)) { 782884d179dSJan Kara spin_unlock(&dq_list_lock); 783884d179dSJan Kara /* Commit dquot before releasing */ 784884d179dSJan Kara ret = dquot->dq_sb->dq_op->write_dquot(dquot); 785884d179dSJan Kara if (ret < 0) { 786fb5ffb0eSJiaying Zhang quota_error(dquot->dq_sb, "Can't write quota structure" 787fb5ffb0eSJiaying Zhang " (error %d). Quota may get out of sync!", 788fb5ffb0eSJiaying Zhang ret); 789884d179dSJan Kara /* 790884d179dSJan Kara * We clear dirty bit anyway, so that we avoid 791884d179dSJan Kara * infinite loop here 792884d179dSJan Kara */ 793884d179dSJan Kara clear_dquot_dirty(dquot); 794884d179dSJan Kara } 795884d179dSJan Kara goto we_slept; 796884d179dSJan Kara } 797884d179dSJan Kara if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { 798884d179dSJan Kara spin_unlock(&dq_list_lock); 799884d179dSJan Kara dquot->dq_sb->dq_op->release_dquot(dquot); 800884d179dSJan Kara goto we_slept; 801884d179dSJan Kara } 802884d179dSJan Kara atomic_dec(&dquot->dq_count); 80362af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 804884d179dSJan Kara /* sanity check */ 805884d179dSJan Kara BUG_ON(!list_empty(&dquot->dq_free)); 806884d179dSJan Kara #endif 807884d179dSJan Kara put_dquot_last(dquot); 808884d179dSJan Kara spin_unlock(&dq_list_lock); 809884d179dSJan Kara } 810884d179dSJan Kara EXPORT_SYMBOL(dqput); 811884d179dSJan Kara 812884d179dSJan Kara struct dquot *dquot_alloc(struct super_block *sb, int type) 813884d179dSJan Kara { 814884d179dSJan Kara return kmem_cache_zalloc(dquot_cachep, GFP_NOFS); 815884d179dSJan Kara } 816884d179dSJan Kara EXPORT_SYMBOL(dquot_alloc); 817884d179dSJan Kara 818884d179dSJan Kara static struct dquot *get_empty_dquot(struct super_block *sb, int type) 819884d179dSJan Kara { 820884d179dSJan Kara struct dquot *dquot; 821884d179dSJan Kara 822884d179dSJan Kara dquot = sb->dq_op->alloc_dquot(sb, type); 823884d179dSJan Kara if(!dquot) 824dd6f3c6dSJan Kara return NULL; 825884d179dSJan Kara 826884d179dSJan Kara mutex_init(&dquot->dq_lock); 827884d179dSJan Kara INIT_LIST_HEAD(&dquot->dq_free); 828884d179dSJan Kara INIT_LIST_HEAD(&dquot->dq_inuse); 829884d179dSJan Kara INIT_HLIST_NODE(&dquot->dq_hash); 830884d179dSJan Kara INIT_LIST_HEAD(&dquot->dq_dirty); 831884d179dSJan Kara dquot->dq_sb = sb; 8321a06d420SEric W. Biederman dquot->dq_id = make_kqid_invalid(type); 833884d179dSJan Kara atomic_set(&dquot->dq_count, 1); 8347b9ca4c6SJan Kara spin_lock_init(&dquot->dq_dqb_lock); 835884d179dSJan Kara 836884d179dSJan Kara return dquot; 837884d179dSJan Kara } 838884d179dSJan Kara 839884d179dSJan Kara /* 840884d179dSJan Kara * Get reference to dquot 841884d179dSJan Kara * 842884d179dSJan Kara * Locking is slightly tricky here. We are guarded from parallel quotaoff() 843884d179dSJan Kara * destroying our dquot by: 844884d179dSJan Kara * a) checking for quota flags under dq_list_lock and 845884d179dSJan Kara * b) getting a reference to dquot before we release dq_list_lock 846884d179dSJan Kara */ 847aca645a6SEric W. Biederman struct dquot *dqget(struct super_block *sb, struct kqid qid) 848884d179dSJan Kara { 8491a06d420SEric W. Biederman unsigned int hashent = hashfn(sb, qid); 8506184fc0bSJan Kara struct dquot *dquot, *empty = NULL; 851884d179dSJan Kara 852d49d3762SEric W. Biederman if (!qid_has_mapping(sb->s_user_ns, qid)) 853d49d3762SEric W. Biederman return ERR_PTR(-EINVAL); 854d49d3762SEric W. Biederman 8551a06d420SEric W. Biederman if (!sb_has_quota_active(sb, qid.type)) 8566184fc0bSJan Kara return ERR_PTR(-ESRCH); 857884d179dSJan Kara we_slept: 858884d179dSJan Kara spin_lock(&dq_list_lock); 859884d179dSJan Kara spin_lock(&dq_state_lock); 8601a06d420SEric W. Biederman if (!sb_has_quota_active(sb, qid.type)) { 861884d179dSJan Kara spin_unlock(&dq_state_lock); 862884d179dSJan Kara spin_unlock(&dq_list_lock); 8636184fc0bSJan Kara dquot = ERR_PTR(-ESRCH); 864884d179dSJan Kara goto out; 865884d179dSJan Kara } 866884d179dSJan Kara spin_unlock(&dq_state_lock); 867884d179dSJan Kara 8681a06d420SEric W. Biederman dquot = find_dquot(hashent, sb, qid); 869dd6f3c6dSJan Kara if (!dquot) { 870dd6f3c6dSJan Kara if (!empty) { 871884d179dSJan Kara spin_unlock(&dq_list_lock); 8721a06d420SEric W. Biederman empty = get_empty_dquot(sb, qid.type); 873dd6f3c6dSJan Kara if (!empty) 874884d179dSJan Kara schedule(); /* Try to wait for a moment... */ 875884d179dSJan Kara goto we_slept; 876884d179dSJan Kara } 877884d179dSJan Kara dquot = empty; 878dd6f3c6dSJan Kara empty = NULL; 8794c376dcaSEric W. Biederman dquot->dq_id = qid; 880884d179dSJan Kara /* all dquots go on the inuse_list */ 881884d179dSJan Kara put_inuse(dquot); 882884d179dSJan Kara /* hash it first so it can be found */ 883884d179dSJan Kara insert_dquot_hash(dquot); 884884d179dSJan Kara spin_unlock(&dq_list_lock); 885dde95888SDmitry Monakhov dqstats_inc(DQST_LOOKUPS); 886884d179dSJan Kara } else { 887884d179dSJan Kara if (!atomic_read(&dquot->dq_count)) 888884d179dSJan Kara remove_free_dquot(dquot); 889884d179dSJan Kara atomic_inc(&dquot->dq_count); 890884d179dSJan Kara spin_unlock(&dq_list_lock); 891dde95888SDmitry Monakhov dqstats_inc(DQST_CACHE_HITS); 892dde95888SDmitry Monakhov dqstats_inc(DQST_LOOKUPS); 893884d179dSJan Kara } 894268157baSJan Kara /* Wait for dq_lock - after this we know that either dquot_release() is 895268157baSJan Kara * already finished or it will be canceled due to dq_count > 1 test */ 896884d179dSJan Kara wait_on_dquot(dquot); 897268157baSJan Kara /* Read the dquot / allocate space in quota file */ 8986184fc0bSJan Kara if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { 8996184fc0bSJan Kara int err; 9006184fc0bSJan Kara 9016184fc0bSJan Kara err = sb->dq_op->acquire_dquot(dquot); 9026184fc0bSJan Kara if (err < 0) { 903884d179dSJan Kara dqput(dquot); 9046184fc0bSJan Kara dquot = ERR_PTR(err); 905884d179dSJan Kara goto out; 906884d179dSJan Kara } 9076184fc0bSJan Kara } 908044c9b67SJan Kara /* 909044c9b67SJan Kara * Make sure following reads see filled structure - paired with 910044c9b67SJan Kara * smp_mb__before_atomic() in dquot_acquire(). 911044c9b67SJan Kara */ 912044c9b67SJan Kara smp_rmb(); 91362af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 914884d179dSJan Kara BUG_ON(!dquot->dq_sb); /* Has somebody invalidated entry under us? */ 915884d179dSJan Kara #endif 916884d179dSJan Kara out: 917884d179dSJan Kara if (empty) 918884d179dSJan Kara do_destroy_dquot(empty); 919884d179dSJan Kara 920884d179dSJan Kara return dquot; 921884d179dSJan Kara } 922884d179dSJan Kara EXPORT_SYMBOL(dqget); 923884d179dSJan Kara 9242d0fa467SJan Kara static inline struct dquot **i_dquot(struct inode *inode) 9252d0fa467SJan Kara { 9262d0fa467SJan Kara return inode->i_sb->s_op->get_dquots(inode); 9272d0fa467SJan Kara } 9282d0fa467SJan Kara 929884d179dSJan Kara static int dqinit_needed(struct inode *inode, int type) 930884d179dSJan Kara { 9315bcd3b6fSKonstantin Khlebnikov struct dquot * const *dquots; 932884d179dSJan Kara int cnt; 933884d179dSJan Kara 934884d179dSJan Kara if (IS_NOQUOTA(inode)) 935884d179dSJan Kara return 0; 9365bcd3b6fSKonstantin Khlebnikov 9375bcd3b6fSKonstantin Khlebnikov dquots = i_dquot(inode); 938884d179dSJan Kara if (type != -1) 9395bcd3b6fSKonstantin Khlebnikov return !dquots[type]; 940884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 9415bcd3b6fSKonstantin Khlebnikov if (!dquots[cnt]) 942884d179dSJan Kara return 1; 943884d179dSJan Kara return 0; 944884d179dSJan Kara } 945884d179dSJan Kara 946c3b00446SJan Kara /* This routine is guarded by s_umount semaphore */ 9471a6152d3SChao Yu static int add_dquot_ref(struct super_block *sb, int type) 948884d179dSJan Kara { 949884d179dSJan Kara struct inode *inode, *old_inode = NULL; 95062af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 9510a5a9c72SJan Kara int reserved = 0; 9524c5e6c0eSJan Kara #endif 9531a6152d3SChao Yu int err = 0; 954884d179dSJan Kara 95574278da9SDave Chinner spin_lock(&sb->s_inode_list_lock); 956884d179dSJan Kara list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { 957250df6edSDave Chinner spin_lock(&inode->i_lock); 958250df6edSDave Chinner if ((inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW)) || 959250df6edSDave Chinner !atomic_read(&inode->i_writecount) || 960250df6edSDave Chinner !dqinit_needed(inode, type)) { 961250df6edSDave Chinner spin_unlock(&inode->i_lock); 9623ae5080fSLinus Torvalds continue; 963250df6edSDave Chinner } 964884d179dSJan Kara __iget(inode); 965250df6edSDave Chinner spin_unlock(&inode->i_lock); 96674278da9SDave Chinner spin_unlock(&sb->s_inode_list_lock); 967884d179dSJan Kara 968d7e97117SJan Kara #ifdef CONFIG_QUOTA_DEBUG 969d7e97117SJan Kara if (unlikely(inode_get_rsv_space(inode) > 0)) 970d7e97117SJan Kara reserved = 1; 971d7e97117SJan Kara #endif 972884d179dSJan Kara iput(old_inode); 9731a6152d3SChao Yu err = __dquot_initialize(inode, type); 9741a6152d3SChao Yu if (err) { 9751a6152d3SChao Yu iput(inode); 9761a6152d3SChao Yu goto out; 9771a6152d3SChao Yu } 97855fa6091SDave Chinner 97955fa6091SDave Chinner /* 98055fa6091SDave Chinner * We hold a reference to 'inode' so it couldn't have been 98155fa6091SDave Chinner * removed from s_inodes list while we dropped the 98274278da9SDave Chinner * s_inode_list_lock. We cannot iput the inode now as we can be 98355fa6091SDave Chinner * holding the last reference and we cannot iput it under 98474278da9SDave Chinner * s_inode_list_lock. So we keep the reference and iput it 98555fa6091SDave Chinner * later. 98655fa6091SDave Chinner */ 987884d179dSJan Kara old_inode = inode; 98874278da9SDave Chinner spin_lock(&sb->s_inode_list_lock); 989884d179dSJan Kara } 99074278da9SDave Chinner spin_unlock(&sb->s_inode_list_lock); 991884d179dSJan Kara iput(old_inode); 9921a6152d3SChao Yu out: 99362af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 9940a5a9c72SJan Kara if (reserved) { 995fb5ffb0eSJiaying Zhang quota_error(sb, "Writes happened before quota was turned on " 996fb5ffb0eSJiaying Zhang "thus quota information is probably inconsistent. " 997fb5ffb0eSJiaying Zhang "Please run quotacheck(8)"); 9980a5a9c72SJan Kara } 9994c5e6c0eSJan Kara #endif 10001a6152d3SChao Yu return err; 1001884d179dSJan Kara } 1002884d179dSJan Kara 1003268157baSJan Kara /* 1004268157baSJan Kara * Remove references to dquots from inode and add dquot to list for freeing 100525985edcSLucas De Marchi * if we have the last reference to dquot 1006268157baSJan Kara */ 10079eb6463fSNiu Yawei static void remove_inode_dquot_ref(struct inode *inode, int type, 1008884d179dSJan Kara struct list_head *tofree_head) 1009884d179dSJan Kara { 10105bcd3b6fSKonstantin Khlebnikov struct dquot **dquots = i_dquot(inode); 10115bcd3b6fSKonstantin Khlebnikov struct dquot *dquot = dquots[type]; 1012884d179dSJan Kara 10139eb6463fSNiu Yawei if (!dquot) 10149eb6463fSNiu Yawei return; 10159eb6463fSNiu Yawei 10165bcd3b6fSKonstantin Khlebnikov dquots[type] = NULL; 10179eb6463fSNiu Yawei if (list_empty(&dquot->dq_free)) { 10189eb6463fSNiu Yawei /* 10199eb6463fSNiu Yawei * The inode still has reference to dquot so it can't be in the 10209eb6463fSNiu Yawei * free list 10219eb6463fSNiu Yawei */ 1022884d179dSJan Kara spin_lock(&dq_list_lock); 1023268157baSJan Kara list_add(&dquot->dq_free, tofree_head); 1024884d179dSJan Kara spin_unlock(&dq_list_lock); 10259eb6463fSNiu Yawei } else { 10269eb6463fSNiu Yawei /* 10279eb6463fSNiu Yawei * Dquot is already in a list to put so we won't drop the last 10289eb6463fSNiu Yawei * reference here. 10299eb6463fSNiu Yawei */ 10309eb6463fSNiu Yawei dqput(dquot); 1031884d179dSJan Kara } 1032884d179dSJan Kara } 1033884d179dSJan Kara 1034268157baSJan Kara /* 1035268157baSJan Kara * Free list of dquots 1036268157baSJan Kara * Dquots are removed from inodes and no new references can be got so we are 1037268157baSJan Kara * the only ones holding reference 1038268157baSJan Kara */ 1039884d179dSJan Kara static void put_dquot_list(struct list_head *tofree_head) 1040884d179dSJan Kara { 1041884d179dSJan Kara struct list_head *act_head; 1042884d179dSJan Kara struct dquot *dquot; 1043884d179dSJan Kara 1044884d179dSJan Kara act_head = tofree_head->next; 1045884d179dSJan Kara while (act_head != tofree_head) { 1046884d179dSJan Kara dquot = list_entry(act_head, struct dquot, dq_free); 1047884d179dSJan Kara act_head = act_head->next; 1048268157baSJan Kara /* Remove dquot from the list so we won't have problems... */ 1049268157baSJan Kara list_del_init(&dquot->dq_free); 1050884d179dSJan Kara dqput(dquot); 1051884d179dSJan Kara } 1052884d179dSJan Kara } 1053884d179dSJan Kara 1054884d179dSJan Kara static void remove_dquot_ref(struct super_block *sb, int type, 1055884d179dSJan Kara struct list_head *tofree_head) 1056884d179dSJan Kara { 1057884d179dSJan Kara struct inode *inode; 105878bc3334SJiang Biao #ifdef CONFIG_QUOTA_DEBUG 10597af9cce8SDmitry Monakhov int reserved = 0; 106078bc3334SJiang Biao #endif 1061884d179dSJan Kara 106274278da9SDave Chinner spin_lock(&sb->s_inode_list_lock); 1063884d179dSJan Kara list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { 10643ae5080fSLinus Torvalds /* 10653ae5080fSLinus Torvalds * We have to scan also I_NEW inodes because they can already 10663ae5080fSLinus Torvalds * have quota pointer initialized. Luckily, we need to touch 10673ae5080fSLinus Torvalds * only quota pointers and these have separate locking 1068b9ba6f94SNiu Yawei * (dq_data_lock). 10693ae5080fSLinus Torvalds */ 1070b9ba6f94SNiu Yawei spin_lock(&dq_data_lock); 10717af9cce8SDmitry Monakhov if (!IS_NOQUOTA(inode)) { 107278bc3334SJiang Biao #ifdef CONFIG_QUOTA_DEBUG 10737af9cce8SDmitry Monakhov if (unlikely(inode_get_rsv_space(inode) > 0)) 10747af9cce8SDmitry Monakhov reserved = 1; 107578bc3334SJiang Biao #endif 1076884d179dSJan Kara remove_inode_dquot_ref(inode, type, tofree_head); 1077884d179dSJan Kara } 1078b9ba6f94SNiu Yawei spin_unlock(&dq_data_lock); 10797af9cce8SDmitry Monakhov } 108074278da9SDave Chinner spin_unlock(&sb->s_inode_list_lock); 10817af9cce8SDmitry Monakhov #ifdef CONFIG_QUOTA_DEBUG 10827af9cce8SDmitry Monakhov if (reserved) { 10837af9cce8SDmitry Monakhov printk(KERN_WARNING "VFS (%s): Writes happened after quota" 10847af9cce8SDmitry Monakhov " was disabled thus quota information is probably " 10857af9cce8SDmitry Monakhov "inconsistent. Please run quotacheck(8).\n", sb->s_id); 10867af9cce8SDmitry Monakhov } 10877af9cce8SDmitry Monakhov #endif 1088884d179dSJan Kara } 1089884d179dSJan Kara 1090884d179dSJan Kara /* Gather all references from inodes and drop them */ 1091884d179dSJan Kara static void drop_dquot_ref(struct super_block *sb, int type) 1092884d179dSJan Kara { 1093884d179dSJan Kara LIST_HEAD(tofree_head); 1094884d179dSJan Kara 1095884d179dSJan Kara if (sb->dq_op) { 1096884d179dSJan Kara remove_dquot_ref(sb, type, &tofree_head); 1097b9ba6f94SNiu Yawei synchronize_srcu(&dquot_srcu); 1098884d179dSJan Kara put_dquot_list(&tofree_head); 1099884d179dSJan Kara } 1100884d179dSJan Kara } 1101884d179dSJan Kara 1102884d179dSJan Kara static inline 1103884d179dSJan Kara void dquot_free_reserved_space(struct dquot *dquot, qsize_t number) 1104884d179dSJan Kara { 11050a5a9c72SJan Kara if (dquot->dq_dqb.dqb_rsvspace >= number) 1106884d179dSJan Kara dquot->dq_dqb.dqb_rsvspace -= number; 11070a5a9c72SJan Kara else { 11080a5a9c72SJan Kara WARN_ON_ONCE(1); 11090a5a9c72SJan Kara dquot->dq_dqb.dqb_rsvspace = 0; 11100a5a9c72SJan Kara } 111141e327b5Szhangyi (F) if (dquot->dq_dqb.dqb_curspace + dquot->dq_dqb.dqb_rsvspace <= 111241e327b5Szhangyi (F) dquot->dq_dqb.dqb_bsoftlimit) 111341e327b5Szhangyi (F) dquot->dq_dqb.dqb_btime = (time64_t) 0; 111441e327b5Szhangyi (F) clear_bit(DQ_BLKS_B, &dquot->dq_flags); 1115884d179dSJan Kara } 1116884d179dSJan Kara 11177a2435d8SJan Kara static void dquot_decr_inodes(struct dquot *dquot, qsize_t number) 1118884d179dSJan Kara { 1119884d179dSJan Kara if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE || 1120884d179dSJan Kara dquot->dq_dqb.dqb_curinodes >= number) 1121884d179dSJan Kara dquot->dq_dqb.dqb_curinodes -= number; 1122884d179dSJan Kara else 1123884d179dSJan Kara dquot->dq_dqb.dqb_curinodes = 0; 1124884d179dSJan Kara if (dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit) 1125e008bb61SArnd Bergmann dquot->dq_dqb.dqb_itime = (time64_t) 0; 1126884d179dSJan Kara clear_bit(DQ_INODES_B, &dquot->dq_flags); 1127884d179dSJan Kara } 1128884d179dSJan Kara 11297a2435d8SJan Kara static void dquot_decr_space(struct dquot *dquot, qsize_t number) 1130884d179dSJan Kara { 1131884d179dSJan Kara if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE || 1132884d179dSJan Kara dquot->dq_dqb.dqb_curspace >= number) 1133884d179dSJan Kara dquot->dq_dqb.dqb_curspace -= number; 1134884d179dSJan Kara else 1135884d179dSJan Kara dquot->dq_dqb.dqb_curspace = 0; 113641e327b5Szhangyi (F) if (dquot->dq_dqb.dqb_curspace + dquot->dq_dqb.dqb_rsvspace <= 113741e327b5Szhangyi (F) dquot->dq_dqb.dqb_bsoftlimit) 1138e008bb61SArnd Bergmann dquot->dq_dqb.dqb_btime = (time64_t) 0; 1139884d179dSJan Kara clear_bit(DQ_BLKS_B, &dquot->dq_flags); 1140884d179dSJan Kara } 1141884d179dSJan Kara 1142bf097aafSJan Kara struct dquot_warn { 1143bf097aafSJan Kara struct super_block *w_sb; 11447b9c7321SEric W. Biederman struct kqid w_dq_id; 1145bf097aafSJan Kara short w_type; 1146bf097aafSJan Kara }; 1147bf097aafSJan Kara 1148884d179dSJan Kara static int warning_issued(struct dquot *dquot, const int warntype) 1149884d179dSJan Kara { 1150884d179dSJan Kara int flag = (warntype == QUOTA_NL_BHARDWARN || 1151884d179dSJan Kara warntype == QUOTA_NL_BSOFTLONGWARN) ? DQ_BLKS_B : 1152884d179dSJan Kara ((warntype == QUOTA_NL_IHARDWARN || 1153884d179dSJan Kara warntype == QUOTA_NL_ISOFTLONGWARN) ? DQ_INODES_B : 0); 1154884d179dSJan Kara 1155884d179dSJan Kara if (!flag) 1156884d179dSJan Kara return 0; 1157884d179dSJan Kara return test_and_set_bit(flag, &dquot->dq_flags); 1158884d179dSJan Kara } 1159884d179dSJan Kara 1160884d179dSJan Kara #ifdef CONFIG_PRINT_QUOTA_WARNING 1161884d179dSJan Kara static int flag_print_warnings = 1; 1162884d179dSJan Kara 1163bf097aafSJan Kara static int need_print_warning(struct dquot_warn *warn) 1164884d179dSJan Kara { 1165884d179dSJan Kara if (!flag_print_warnings) 1166884d179dSJan Kara return 0; 1167884d179dSJan Kara 11687b9c7321SEric W. Biederman switch (warn->w_dq_id.type) { 1169884d179dSJan Kara case USRQUOTA: 11701a06d420SEric W. Biederman return uid_eq(current_fsuid(), warn->w_dq_id.uid); 1171884d179dSJan Kara case GRPQUOTA: 11727b9c7321SEric W. Biederman return in_group_p(warn->w_dq_id.gid); 1173847aac64SLi Xi case PRJQUOTA: 1174847aac64SLi Xi return 1; 1175884d179dSJan Kara } 1176884d179dSJan Kara return 0; 1177884d179dSJan Kara } 1178884d179dSJan Kara 1179884d179dSJan Kara /* Print warning to user which exceeded quota */ 1180bf097aafSJan Kara static void print_warning(struct dquot_warn *warn) 1181884d179dSJan Kara { 1182884d179dSJan Kara char *msg = NULL; 1183884d179dSJan Kara struct tty_struct *tty; 1184bf097aafSJan Kara int warntype = warn->w_type; 1185884d179dSJan Kara 1186884d179dSJan Kara if (warntype == QUOTA_NL_IHARDBELOW || 1187884d179dSJan Kara warntype == QUOTA_NL_ISOFTBELOW || 1188884d179dSJan Kara warntype == QUOTA_NL_BHARDBELOW || 1189bf097aafSJan Kara warntype == QUOTA_NL_BSOFTBELOW || !need_print_warning(warn)) 1190884d179dSJan Kara return; 1191884d179dSJan Kara 1192884d179dSJan Kara tty = get_current_tty(); 1193884d179dSJan Kara if (!tty) 1194884d179dSJan Kara return; 1195bf097aafSJan Kara tty_write_message(tty, warn->w_sb->s_id); 1196884d179dSJan Kara if (warntype == QUOTA_NL_ISOFTWARN || warntype == QUOTA_NL_BSOFTWARN) 1197884d179dSJan Kara tty_write_message(tty, ": warning, "); 1198884d179dSJan Kara else 1199884d179dSJan Kara tty_write_message(tty, ": write failed, "); 12007b9c7321SEric W. Biederman tty_write_message(tty, quotatypes[warn->w_dq_id.type]); 1201884d179dSJan Kara switch (warntype) { 1202884d179dSJan Kara case QUOTA_NL_IHARDWARN: 1203884d179dSJan Kara msg = " file limit reached.\r\n"; 1204884d179dSJan Kara break; 1205884d179dSJan Kara case QUOTA_NL_ISOFTLONGWARN: 1206884d179dSJan Kara msg = " file quota exceeded too long.\r\n"; 1207884d179dSJan Kara break; 1208884d179dSJan Kara case QUOTA_NL_ISOFTWARN: 1209884d179dSJan Kara msg = " file quota exceeded.\r\n"; 1210884d179dSJan Kara break; 1211884d179dSJan Kara case QUOTA_NL_BHARDWARN: 1212884d179dSJan Kara msg = " block limit reached.\r\n"; 1213884d179dSJan Kara break; 1214884d179dSJan Kara case QUOTA_NL_BSOFTLONGWARN: 1215884d179dSJan Kara msg = " block quota exceeded too long.\r\n"; 1216884d179dSJan Kara break; 1217884d179dSJan Kara case QUOTA_NL_BSOFTWARN: 1218884d179dSJan Kara msg = " block quota exceeded.\r\n"; 1219884d179dSJan Kara break; 1220884d179dSJan Kara } 1221884d179dSJan Kara tty_write_message(tty, msg); 1222884d179dSJan Kara tty_kref_put(tty); 1223884d179dSJan Kara } 1224884d179dSJan Kara #endif 1225884d179dSJan Kara 1226bf097aafSJan Kara static void prepare_warning(struct dquot_warn *warn, struct dquot *dquot, 1227bf097aafSJan Kara int warntype) 1228bf097aafSJan Kara { 1229bf097aafSJan Kara if (warning_issued(dquot, warntype)) 1230bf097aafSJan Kara return; 1231bf097aafSJan Kara warn->w_type = warntype; 1232bf097aafSJan Kara warn->w_sb = dquot->dq_sb; 1233bf097aafSJan Kara warn->w_dq_id = dquot->dq_id; 1234bf097aafSJan Kara } 1235bf097aafSJan Kara 1236884d179dSJan Kara /* 1237884d179dSJan Kara * Write warnings to the console and send warning messages over netlink. 1238884d179dSJan Kara * 1239bf097aafSJan Kara * Note that this function can call into tty and networking code. 1240884d179dSJan Kara */ 1241bf097aafSJan Kara static void flush_warnings(struct dquot_warn *warn) 1242884d179dSJan Kara { 1243884d179dSJan Kara int i; 1244884d179dSJan Kara 124586e931a3SSteven Whitehouse for (i = 0; i < MAXQUOTAS; i++) { 1246bf097aafSJan Kara if (warn[i].w_type == QUOTA_NL_NOWARN) 1247bf097aafSJan Kara continue; 1248884d179dSJan Kara #ifdef CONFIG_PRINT_QUOTA_WARNING 1249bf097aafSJan Kara print_warning(&warn[i]); 1250884d179dSJan Kara #endif 12517b9c7321SEric W. Biederman quota_send_warning(warn[i].w_dq_id, 1252bf097aafSJan Kara warn[i].w_sb->s_dev, warn[i].w_type); 1253884d179dSJan Kara } 1254884d179dSJan Kara } 1255884d179dSJan Kara 12567a2435d8SJan Kara static int ignore_hardlimit(struct dquot *dquot) 1257884d179dSJan Kara { 12584c376dcaSEric W. Biederman struct mem_dqinfo *info = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_id.type]; 1259884d179dSJan Kara 1260884d179dSJan Kara return capable(CAP_SYS_RESOURCE) && 1261268157baSJan Kara (info->dqi_format->qf_fmt_id != QFMT_VFS_OLD || 12629c45101eSJan Kara !(info->dqi_flags & DQF_ROOT_SQUASH)); 1263884d179dSJan Kara } 1264884d179dSJan Kara 12657b9ca4c6SJan Kara static int dquot_add_inodes(struct dquot *dquot, qsize_t inodes, 1266bf097aafSJan Kara struct dquot_warn *warn) 1267884d179dSJan Kara { 12687b9ca4c6SJan Kara qsize_t newinodes; 12697b9ca4c6SJan Kara int ret = 0; 1270268157baSJan Kara 12717b9ca4c6SJan Kara spin_lock(&dquot->dq_dqb_lock); 12727b9ca4c6SJan Kara newinodes = dquot->dq_dqb.dqb_curinodes + inodes; 12734c376dcaSEric W. Biederman if (!sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_id.type) || 1274884d179dSJan Kara test_bit(DQ_FAKE_B, &dquot->dq_flags)) 12757b9ca4c6SJan Kara goto add; 1276884d179dSJan Kara 1277884d179dSJan Kara if (dquot->dq_dqb.dqb_ihardlimit && 1278268157baSJan Kara newinodes > dquot->dq_dqb.dqb_ihardlimit && 1279884d179dSJan Kara !ignore_hardlimit(dquot)) { 1280bf097aafSJan Kara prepare_warning(warn, dquot, QUOTA_NL_IHARDWARN); 12817b9ca4c6SJan Kara ret = -EDQUOT; 12827b9ca4c6SJan Kara goto out; 1283884d179dSJan Kara } 1284884d179dSJan Kara 1285884d179dSJan Kara if (dquot->dq_dqb.dqb_isoftlimit && 1286268157baSJan Kara newinodes > dquot->dq_dqb.dqb_isoftlimit && 1287268157baSJan Kara dquot->dq_dqb.dqb_itime && 1288e008bb61SArnd Bergmann ktime_get_real_seconds() >= dquot->dq_dqb.dqb_itime && 1289884d179dSJan Kara !ignore_hardlimit(dquot)) { 1290bf097aafSJan Kara prepare_warning(warn, dquot, QUOTA_NL_ISOFTLONGWARN); 12917b9ca4c6SJan Kara ret = -EDQUOT; 12927b9ca4c6SJan Kara goto out; 1293884d179dSJan Kara } 1294884d179dSJan Kara 1295884d179dSJan Kara if (dquot->dq_dqb.dqb_isoftlimit && 1296268157baSJan Kara newinodes > dquot->dq_dqb.dqb_isoftlimit && 1297884d179dSJan Kara dquot->dq_dqb.dqb_itime == 0) { 1298bf097aafSJan Kara prepare_warning(warn, dquot, QUOTA_NL_ISOFTWARN); 1299e008bb61SArnd Bergmann dquot->dq_dqb.dqb_itime = ktime_get_real_seconds() + 13004c376dcaSEric W. Biederman sb_dqopt(dquot->dq_sb)->info[dquot->dq_id.type].dqi_igrace; 1301884d179dSJan Kara } 13027b9ca4c6SJan Kara add: 13037b9ca4c6SJan Kara dquot->dq_dqb.dqb_curinodes = newinodes; 1304884d179dSJan Kara 13057b9ca4c6SJan Kara out: 13067b9ca4c6SJan Kara spin_unlock(&dquot->dq_dqb_lock); 13077b9ca4c6SJan Kara return ret; 1308884d179dSJan Kara } 1309884d179dSJan Kara 13107b9ca4c6SJan Kara static int dquot_add_space(struct dquot *dquot, qsize_t space, 13117b9ca4c6SJan Kara qsize_t rsv_space, unsigned int flags, 1312bf097aafSJan Kara struct dquot_warn *warn) 1313884d179dSJan Kara { 1314884d179dSJan Kara qsize_t tspace; 1315268157baSJan Kara struct super_block *sb = dquot->dq_sb; 13167b9ca4c6SJan Kara int ret = 0; 1317884d179dSJan Kara 13187b9ca4c6SJan Kara spin_lock(&dquot->dq_dqb_lock); 13194c376dcaSEric W. Biederman if (!sb_has_quota_limits_enabled(sb, dquot->dq_id.type) || 1320884d179dSJan Kara test_bit(DQ_FAKE_B, &dquot->dq_flags)) 1321ac3d7939SJan Kara goto finish; 1322884d179dSJan Kara 1323884d179dSJan Kara tspace = dquot->dq_dqb.dqb_curspace + dquot->dq_dqb.dqb_rsvspace 13247b9ca4c6SJan Kara + space + rsv_space; 13257b9ca4c6SJan Kara 1326884d179dSJan Kara if (dquot->dq_dqb.dqb_bhardlimit && 1327884d179dSJan Kara tspace > dquot->dq_dqb.dqb_bhardlimit && 1328884d179dSJan Kara !ignore_hardlimit(dquot)) { 13297b9ca4c6SJan Kara if (flags & DQUOT_SPACE_WARN) 1330bf097aafSJan Kara prepare_warning(warn, dquot, QUOTA_NL_BHARDWARN); 13317b9ca4c6SJan Kara ret = -EDQUOT; 1332ac3d7939SJan Kara goto finish; 1333884d179dSJan Kara } 1334884d179dSJan Kara 1335884d179dSJan Kara if (dquot->dq_dqb.dqb_bsoftlimit && 1336884d179dSJan Kara tspace > dquot->dq_dqb.dqb_bsoftlimit && 1337268157baSJan Kara dquot->dq_dqb.dqb_btime && 1338e008bb61SArnd Bergmann ktime_get_real_seconds() >= dquot->dq_dqb.dqb_btime && 1339884d179dSJan Kara !ignore_hardlimit(dquot)) { 13407b9ca4c6SJan Kara if (flags & DQUOT_SPACE_WARN) 1341bf097aafSJan Kara prepare_warning(warn, dquot, QUOTA_NL_BSOFTLONGWARN); 13427b9ca4c6SJan Kara ret = -EDQUOT; 1343ac3d7939SJan Kara goto finish; 1344884d179dSJan Kara } 1345884d179dSJan Kara 1346884d179dSJan Kara if (dquot->dq_dqb.dqb_bsoftlimit && 1347884d179dSJan Kara tspace > dquot->dq_dqb.dqb_bsoftlimit && 1348884d179dSJan Kara dquot->dq_dqb.dqb_btime == 0) { 13497b9ca4c6SJan Kara if (flags & DQUOT_SPACE_WARN) { 1350bf097aafSJan Kara prepare_warning(warn, dquot, QUOTA_NL_BSOFTWARN); 1351e008bb61SArnd Bergmann dquot->dq_dqb.dqb_btime = ktime_get_real_seconds() + 13524c376dcaSEric W. Biederman sb_dqopt(sb)->info[dquot->dq_id.type].dqi_bgrace; 13537b9ca4c6SJan Kara } else { 1354884d179dSJan Kara /* 1355884d179dSJan Kara * We don't allow preallocation to exceed softlimit so exceeding will 1356884d179dSJan Kara * be always printed 1357884d179dSJan Kara */ 13587b9ca4c6SJan Kara ret = -EDQUOT; 1359ac3d7939SJan Kara goto finish; 1360884d179dSJan Kara } 13617b9ca4c6SJan Kara } 1362ac3d7939SJan Kara finish: 1363ac3d7939SJan Kara /* 1364ac3d7939SJan Kara * We have to be careful and go through warning generation & grace time 1365ac3d7939SJan Kara * setting even if DQUOT_SPACE_NOFAIL is set. That's why we check it 1366ac3d7939SJan Kara * only here... 1367ac3d7939SJan Kara */ 1368ac3d7939SJan Kara if (flags & DQUOT_SPACE_NOFAIL) 1369ac3d7939SJan Kara ret = 0; 1370ac3d7939SJan Kara if (!ret) { 13717b9ca4c6SJan Kara dquot->dq_dqb.dqb_rsvspace += rsv_space; 13727b9ca4c6SJan Kara dquot->dq_dqb.dqb_curspace += space; 1373ac3d7939SJan Kara } 13747b9ca4c6SJan Kara spin_unlock(&dquot->dq_dqb_lock); 13757b9ca4c6SJan Kara return ret; 1376884d179dSJan Kara } 1377884d179dSJan Kara 1378884d179dSJan Kara static int info_idq_free(struct dquot *dquot, qsize_t inodes) 1379884d179dSJan Kara { 1380268157baSJan Kara qsize_t newinodes; 1381268157baSJan Kara 1382884d179dSJan Kara if (test_bit(DQ_FAKE_B, &dquot->dq_flags) || 1383884d179dSJan Kara dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit || 13844c376dcaSEric W. Biederman !sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_id.type)) 1385884d179dSJan Kara return QUOTA_NL_NOWARN; 1386884d179dSJan Kara 1387268157baSJan Kara newinodes = dquot->dq_dqb.dqb_curinodes - inodes; 1388268157baSJan Kara if (newinodes <= dquot->dq_dqb.dqb_isoftlimit) 1389884d179dSJan Kara return QUOTA_NL_ISOFTBELOW; 1390884d179dSJan Kara if (dquot->dq_dqb.dqb_curinodes >= dquot->dq_dqb.dqb_ihardlimit && 1391268157baSJan Kara newinodes < dquot->dq_dqb.dqb_ihardlimit) 1392884d179dSJan Kara return QUOTA_NL_IHARDBELOW; 1393884d179dSJan Kara return QUOTA_NL_NOWARN; 1394884d179dSJan Kara } 1395884d179dSJan Kara 1396884d179dSJan Kara static int info_bdq_free(struct dquot *dquot, qsize_t space) 1397884d179dSJan Kara { 139841e327b5Szhangyi (F) qsize_t tspace; 139941e327b5Szhangyi (F) 140041e327b5Szhangyi (F) tspace = dquot->dq_dqb.dqb_curspace + dquot->dq_dqb.dqb_rsvspace; 140141e327b5Szhangyi (F) 1402884d179dSJan Kara if (test_bit(DQ_FAKE_B, &dquot->dq_flags) || 140341e327b5Szhangyi (F) tspace <= dquot->dq_dqb.dqb_bsoftlimit) 1404884d179dSJan Kara return QUOTA_NL_NOWARN; 1405884d179dSJan Kara 140641e327b5Szhangyi (F) if (tspace - space <= dquot->dq_dqb.dqb_bsoftlimit) 1407884d179dSJan Kara return QUOTA_NL_BSOFTBELOW; 140841e327b5Szhangyi (F) if (tspace >= dquot->dq_dqb.dqb_bhardlimit && 140941e327b5Szhangyi (F) tspace - space < dquot->dq_dqb.dqb_bhardlimit) 1410884d179dSJan Kara return QUOTA_NL_BHARDBELOW; 1411884d179dSJan Kara return QUOTA_NL_NOWARN; 1412884d179dSJan Kara } 14130a5a9c72SJan Kara 1414189eef59SChristoph Hellwig static int dquot_active(const struct inode *inode) 1415189eef59SChristoph Hellwig { 1416189eef59SChristoph Hellwig struct super_block *sb = inode->i_sb; 1417189eef59SChristoph Hellwig 1418189eef59SChristoph Hellwig if (IS_NOQUOTA(inode)) 1419189eef59SChristoph Hellwig return 0; 1420189eef59SChristoph Hellwig return sb_any_quota_loaded(sb) & ~sb_any_quota_suspended(sb); 1421189eef59SChristoph Hellwig } 1422189eef59SChristoph Hellwig 1423884d179dSJan Kara /* 1424884d179dSJan Kara * Initialize quota pointers in inode 1425871a2931SChristoph Hellwig * 1426871a2931SChristoph Hellwig * It is better to call this function outside of any transaction as it 1427871a2931SChristoph Hellwig * might need a lot of space in journal for dquot structure allocation. 1428884d179dSJan Kara */ 14296184fc0bSJan Kara static int __dquot_initialize(struct inode *inode, int type) 1430884d179dSJan Kara { 14311ea06becSNiu Yawei int cnt, init_needed = 0; 1432ab73ef46SNikolay Borisov struct dquot **dquots, *got[MAXQUOTAS] = {}; 1433884d179dSJan Kara struct super_block *sb = inode->i_sb; 14340a5a9c72SJan Kara qsize_t rsv; 14356184fc0bSJan Kara int ret = 0; 1436884d179dSJan Kara 1437189eef59SChristoph Hellwig if (!dquot_active(inode)) 14386184fc0bSJan Kara return 0; 1439884d179dSJan Kara 14405bcd3b6fSKonstantin Khlebnikov dquots = i_dquot(inode); 14415bcd3b6fSKonstantin Khlebnikov 1442884d179dSJan Kara /* First get references to structures we might need. */ 1443884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1444aca645a6SEric W. Biederman struct kqid qid; 1445847aac64SLi Xi kprojid_t projid; 1446847aac64SLi Xi int rc; 14476184fc0bSJan Kara struct dquot *dquot; 1448847aac64SLi Xi 1449884d179dSJan Kara if (type != -1 && cnt != type) 1450884d179dSJan Kara continue; 14511ea06becSNiu Yawei /* 14521ea06becSNiu Yawei * The i_dquot should have been initialized in most cases, 14531ea06becSNiu Yawei * we check it without locking here to avoid unnecessary 14541ea06becSNiu Yawei * dqget()/dqput() calls. 14551ea06becSNiu Yawei */ 14565bcd3b6fSKonstantin Khlebnikov if (dquots[cnt]) 14571ea06becSNiu Yawei continue; 1458847aac64SLi Xi 1459847aac64SLi Xi if (!sb_has_quota_active(sb, cnt)) 1460847aac64SLi Xi continue; 1461847aac64SLi Xi 14621ea06becSNiu Yawei init_needed = 1; 14631ea06becSNiu Yawei 1464884d179dSJan Kara switch (cnt) { 1465884d179dSJan Kara case USRQUOTA: 1466aca645a6SEric W. Biederman qid = make_kqid_uid(inode->i_uid); 1467884d179dSJan Kara break; 1468884d179dSJan Kara case GRPQUOTA: 1469aca645a6SEric W. Biederman qid = make_kqid_gid(inode->i_gid); 1470884d179dSJan Kara break; 1471847aac64SLi Xi case PRJQUOTA: 1472847aac64SLi Xi rc = inode->i_sb->dq_op->get_projid(inode, &projid); 1473847aac64SLi Xi if (rc) 1474847aac64SLi Xi continue; 1475847aac64SLi Xi qid = make_kqid_projid(projid); 1476847aac64SLi Xi break; 1477884d179dSJan Kara } 14786184fc0bSJan Kara dquot = dqget(sb, qid); 14796184fc0bSJan Kara if (IS_ERR(dquot)) { 14806184fc0bSJan Kara /* We raced with somebody turning quotas off... */ 14816184fc0bSJan Kara if (PTR_ERR(dquot) != -ESRCH) { 14826184fc0bSJan Kara ret = PTR_ERR(dquot); 14836184fc0bSJan Kara goto out_put; 14846184fc0bSJan Kara } 14856184fc0bSJan Kara dquot = NULL; 14866184fc0bSJan Kara } 14876184fc0bSJan Kara got[cnt] = dquot; 1488884d179dSJan Kara } 1489884d179dSJan Kara 14901ea06becSNiu Yawei /* All required i_dquot has been initialized */ 14911ea06becSNiu Yawei if (!init_needed) 14926184fc0bSJan Kara return 0; 14931ea06becSNiu Yawei 1494b9ba6f94SNiu Yawei spin_lock(&dq_data_lock); 1495884d179dSJan Kara if (IS_NOQUOTA(inode)) 14966184fc0bSJan Kara goto out_lock; 1497884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1498884d179dSJan Kara if (type != -1 && cnt != type) 1499884d179dSJan Kara continue; 1500884d179dSJan Kara /* Avoid races with quotaoff() */ 1501884d179dSJan Kara if (!sb_has_quota_active(sb, cnt)) 1502884d179dSJan Kara continue; 15034408ea41SJan Kara /* We could race with quotaon or dqget() could have failed */ 15044408ea41SJan Kara if (!got[cnt]) 15054408ea41SJan Kara continue; 15065bcd3b6fSKonstantin Khlebnikov if (!dquots[cnt]) { 15075bcd3b6fSKonstantin Khlebnikov dquots[cnt] = got[cnt]; 1508dd6f3c6dSJan Kara got[cnt] = NULL; 15090a5a9c72SJan Kara /* 15100a5a9c72SJan Kara * Make quota reservation system happy if someone 15110a5a9c72SJan Kara * did a write before quota was turned on 15120a5a9c72SJan Kara */ 15130a5a9c72SJan Kara rsv = inode_get_rsv_space(inode); 15147b9ca4c6SJan Kara if (unlikely(rsv)) { 15157b9ca4c6SJan Kara spin_lock(&inode->i_lock); 15167b9ca4c6SJan Kara /* Get reservation again under proper lock */ 15177b9ca4c6SJan Kara rsv = __inode_get_rsv_space(inode); 15187b9ca4c6SJan Kara spin_lock(&dquots[cnt]->dq_dqb_lock); 15197b9ca4c6SJan Kara dquots[cnt]->dq_dqb.dqb_rsvspace += rsv; 15207b9ca4c6SJan Kara spin_unlock(&dquots[cnt]->dq_dqb_lock); 15217b9ca4c6SJan Kara spin_unlock(&inode->i_lock); 15227b9ca4c6SJan Kara } 1523884d179dSJan Kara } 1524884d179dSJan Kara } 15256184fc0bSJan Kara out_lock: 1526b9ba6f94SNiu Yawei spin_unlock(&dq_data_lock); 15276184fc0bSJan Kara out_put: 1528884d179dSJan Kara /* Drop unused references */ 1529dc52dd3aSDmitry Monakhov dqput_all(got); 15306184fc0bSJan Kara 15316184fc0bSJan Kara return ret; 1532871a2931SChristoph Hellwig } 1533871a2931SChristoph Hellwig 15346184fc0bSJan Kara int dquot_initialize(struct inode *inode) 1535871a2931SChristoph Hellwig { 15366184fc0bSJan Kara return __dquot_initialize(inode, -1); 1537884d179dSJan Kara } 1538884d179dSJan Kara EXPORT_SYMBOL(dquot_initialize); 1539884d179dSJan Kara 1540b8cb5a54STahsin Erdogan bool dquot_initialize_needed(struct inode *inode) 1541b8cb5a54STahsin Erdogan { 1542b8cb5a54STahsin Erdogan struct dquot **dquots; 1543b8cb5a54STahsin Erdogan int i; 1544b8cb5a54STahsin Erdogan 1545b8cb5a54STahsin Erdogan if (!dquot_active(inode)) 1546b8cb5a54STahsin Erdogan return false; 1547b8cb5a54STahsin Erdogan 1548b8cb5a54STahsin Erdogan dquots = i_dquot(inode); 1549b8cb5a54STahsin Erdogan for (i = 0; i < MAXQUOTAS; i++) 1550b8cb5a54STahsin Erdogan if (!dquots[i] && sb_has_quota_active(inode->i_sb, i)) 1551b8cb5a54STahsin Erdogan return true; 1552b8cb5a54STahsin Erdogan return false; 1553b8cb5a54STahsin Erdogan } 1554b8cb5a54STahsin Erdogan EXPORT_SYMBOL(dquot_initialize_needed); 1555b8cb5a54STahsin Erdogan 1556884d179dSJan Kara /* 1557b9ba6f94SNiu Yawei * Release all quotas referenced by inode. 1558b9ba6f94SNiu Yawei * 1559b9ba6f94SNiu Yawei * This function only be called on inode free or converting 1560b9ba6f94SNiu Yawei * a file to quota file, no other users for the i_dquot in 1561b9ba6f94SNiu Yawei * both cases, so we needn't call synchronize_srcu() after 1562b9ba6f94SNiu Yawei * clearing i_dquot. 1563884d179dSJan Kara */ 15649f754758SChristoph Hellwig static void __dquot_drop(struct inode *inode) 1565884d179dSJan Kara { 1566884d179dSJan Kara int cnt; 15675bcd3b6fSKonstantin Khlebnikov struct dquot **dquots = i_dquot(inode); 1568884d179dSJan Kara struct dquot *put[MAXQUOTAS]; 1569884d179dSJan Kara 1570b9ba6f94SNiu Yawei spin_lock(&dq_data_lock); 1571884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 15725bcd3b6fSKonstantin Khlebnikov put[cnt] = dquots[cnt]; 15735bcd3b6fSKonstantin Khlebnikov dquots[cnt] = NULL; 1574884d179dSJan Kara } 1575b9ba6f94SNiu Yawei spin_unlock(&dq_data_lock); 1576dc52dd3aSDmitry Monakhov dqput_all(put); 1577884d179dSJan Kara } 1578884d179dSJan Kara 15799f754758SChristoph Hellwig void dquot_drop(struct inode *inode) 1580884d179dSJan Kara { 15815bcd3b6fSKonstantin Khlebnikov struct dquot * const *dquots; 1582884d179dSJan Kara int cnt; 15839f754758SChristoph Hellwig 15849f754758SChristoph Hellwig if (IS_NOQUOTA(inode)) 15859f754758SChristoph Hellwig return; 15869f754758SChristoph Hellwig 15879f754758SChristoph Hellwig /* 15889f754758SChristoph Hellwig * Test before calling to rule out calls from proc and such 1589884d179dSJan Kara * where we are not allowed to block. Note that this is 1590884d179dSJan Kara * actually reliable test even without the lock - the caller 1591884d179dSJan Kara * must assure that nobody can come after the DQUOT_DROP and 15929f754758SChristoph Hellwig * add quota pointers back anyway. 15939f754758SChristoph Hellwig */ 15945bcd3b6fSKonstantin Khlebnikov dquots = i_dquot(inode); 15959f754758SChristoph Hellwig for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 15965bcd3b6fSKonstantin Khlebnikov if (dquots[cnt]) 1597884d179dSJan Kara break; 15989f754758SChristoph Hellwig } 15999f754758SChristoph Hellwig 1600884d179dSJan Kara if (cnt < MAXQUOTAS) 16019f754758SChristoph Hellwig __dquot_drop(inode); 1602884d179dSJan Kara } 16039f754758SChristoph Hellwig EXPORT_SYMBOL(dquot_drop); 1604884d179dSJan Kara 1605884d179dSJan Kara /* 1606fd8fbfc1SDmitry Monakhov * inode_reserved_space is managed internally by quota, and protected by 1607fd8fbfc1SDmitry Monakhov * i_lock similar to i_blocks+i_bytes. 1608fd8fbfc1SDmitry Monakhov */ 1609fd8fbfc1SDmitry Monakhov static qsize_t *inode_reserved_space(struct inode * inode) 1610fd8fbfc1SDmitry Monakhov { 1611fd8fbfc1SDmitry Monakhov /* Filesystem must explicitly define it's own method in order to use 1612fd8fbfc1SDmitry Monakhov * quota reservation interface */ 1613fd8fbfc1SDmitry Monakhov BUG_ON(!inode->i_sb->dq_op->get_reserved_space); 1614fd8fbfc1SDmitry Monakhov return inode->i_sb->dq_op->get_reserved_space(inode); 1615fd8fbfc1SDmitry Monakhov } 1616fd8fbfc1SDmitry Monakhov 16177b9ca4c6SJan Kara static qsize_t __inode_get_rsv_space(struct inode *inode) 1618fd8fbfc1SDmitry Monakhov { 16197b9ca4c6SJan Kara if (!inode->i_sb->dq_op->get_reserved_space) 16207b9ca4c6SJan Kara return 0; 16217b9ca4c6SJan Kara return *inode_reserved_space(inode); 1622fd8fbfc1SDmitry Monakhov } 1623fd8fbfc1SDmitry Monakhov 1624fd8fbfc1SDmitry Monakhov static qsize_t inode_get_rsv_space(struct inode *inode) 1625fd8fbfc1SDmitry Monakhov { 1626fd8fbfc1SDmitry Monakhov qsize_t ret; 162705b5d898SJan Kara 162805b5d898SJan Kara if (!inode->i_sb->dq_op->get_reserved_space) 162905b5d898SJan Kara return 0; 1630fd8fbfc1SDmitry Monakhov spin_lock(&inode->i_lock); 16317b9ca4c6SJan Kara ret = __inode_get_rsv_space(inode); 1632fd8fbfc1SDmitry Monakhov spin_unlock(&inode->i_lock); 1633fd8fbfc1SDmitry Monakhov return ret; 1634fd8fbfc1SDmitry Monakhov } 1635fd8fbfc1SDmitry Monakhov 1636fd8fbfc1SDmitry Monakhov /* 16375dd4056dSChristoph Hellwig * This functions updates i_blocks+i_bytes fields and quota information 16385dd4056dSChristoph Hellwig * (together with appropriate checks). 16395dd4056dSChristoph Hellwig * 16405dd4056dSChristoph Hellwig * NOTE: We absolutely rely on the fact that caller dirties the inode 16415dd4056dSChristoph Hellwig * (usually helpers in quotaops.h care about this) and holds a handle for 16425dd4056dSChristoph Hellwig * the current transaction so that dquot write and inode write go into the 16435dd4056dSChristoph Hellwig * same transaction. 1644884d179dSJan Kara */ 1645884d179dSJan Kara 1646884d179dSJan Kara /* 1647884d179dSJan Kara * This operation can block, but only after everything is updated 1648884d179dSJan Kara */ 164956246f9aSEric Sandeen int __dquot_alloc_space(struct inode *inode, qsize_t number, int flags) 1650884d179dSJan Kara { 1651b9ba6f94SNiu Yawei int cnt, ret = 0, index; 1652bf097aafSJan Kara struct dquot_warn warn[MAXQUOTAS]; 165356246f9aSEric Sandeen int reserve = flags & DQUOT_SPACE_RESERVE; 16545bcd3b6fSKonstantin Khlebnikov struct dquot **dquots; 1655884d179dSJan Kara 1656189eef59SChristoph Hellwig if (!dquot_active(inode)) { 1657a478e522SJan Kara if (reserve) { 1658a478e522SJan Kara spin_lock(&inode->i_lock); 1659a478e522SJan Kara *inode_reserved_space(inode) += number; 1660a478e522SJan Kara spin_unlock(&inode->i_lock); 1661a478e522SJan Kara } else { 1662a478e522SJan Kara inode_add_bytes(inode, number); 1663a478e522SJan Kara } 1664fd8fbfc1SDmitry Monakhov goto out; 1665fd8fbfc1SDmitry Monakhov } 1666fd8fbfc1SDmitry Monakhov 1667884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 1668bf097aafSJan Kara warn[cnt].w_type = QUOTA_NL_NOWARN; 1669884d179dSJan Kara 16705bcd3b6fSKonstantin Khlebnikov dquots = i_dquot(inode); 1671b9ba6f94SNiu Yawei index = srcu_read_lock(&dquot_srcu); 16727b9ca4c6SJan Kara spin_lock(&inode->i_lock); 1673884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1674bf097aafSJan Kara if (!dquots[cnt]) 1675884d179dSJan Kara continue; 1676df15a2a5SChengguang Xu if (reserve) { 16777b9ca4c6SJan Kara ret = dquot_add_space(dquots[cnt], 0, number, flags, 16787b9ca4c6SJan Kara &warn[cnt]); 16797b9ca4c6SJan Kara } else { 16807b9ca4c6SJan Kara ret = dquot_add_space(dquots[cnt], number, 0, flags, 16817b9ca4c6SJan Kara &warn[cnt]); 16827b9ca4c6SJan Kara } 16837b9ca4c6SJan Kara if (ret) { 16847b9ca4c6SJan Kara /* Back out changes we already did */ 16857b9ca4c6SJan Kara for (cnt--; cnt >= 0; cnt--) { 16867b9ca4c6SJan Kara if (!dquots[cnt]) 16877b9ca4c6SJan Kara continue; 16887b9ca4c6SJan Kara spin_lock(&dquots[cnt]->dq_dqb_lock); 1689632a9f3aSChengguang Xu if (reserve) 1690632a9f3aSChengguang Xu dquot_free_reserved_space(dquots[cnt], 1691632a9f3aSChengguang Xu number); 1692632a9f3aSChengguang Xu else 1693632a9f3aSChengguang Xu dquot_decr_space(dquots[cnt], number); 16947b9ca4c6SJan Kara spin_unlock(&dquots[cnt]->dq_dqb_lock); 16957b9ca4c6SJan Kara } 16967b9ca4c6SJan Kara spin_unlock(&inode->i_lock); 1697fd8fbfc1SDmitry Monakhov goto out_flush_warn; 1698884d179dSJan Kara } 1699884d179dSJan Kara } 1700884d179dSJan Kara if (reserve) 1701a478e522SJan Kara *inode_reserved_space(inode) += number; 1702884d179dSJan Kara else 17037b9ca4c6SJan Kara __inode_add_bytes(inode, number); 1704a478e522SJan Kara spin_unlock(&inode->i_lock); 1705fd8fbfc1SDmitry Monakhov 1706fd8fbfc1SDmitry Monakhov if (reserve) 1707fd8fbfc1SDmitry Monakhov goto out_flush_warn; 1708bf097aafSJan Kara mark_all_dquot_dirty(dquots); 1709fd8fbfc1SDmitry Monakhov out_flush_warn: 1710b9ba6f94SNiu Yawei srcu_read_unlock(&dquot_srcu, index); 1711bf097aafSJan Kara flush_warnings(warn); 1712fd8fbfc1SDmitry Monakhov out: 1713884d179dSJan Kara return ret; 1714884d179dSJan Kara } 17155dd4056dSChristoph Hellwig EXPORT_SYMBOL(__dquot_alloc_space); 1716884d179dSJan Kara 1717884d179dSJan Kara /* 1718884d179dSJan Kara * This operation can block, but only after everything is updated 1719884d179dSJan Kara */ 17206bab3596SJan Kara int dquot_alloc_inode(struct inode *inode) 1721884d179dSJan Kara { 1722b9ba6f94SNiu Yawei int cnt, ret = 0, index; 1723bf097aafSJan Kara struct dquot_warn warn[MAXQUOTAS]; 17245bcd3b6fSKonstantin Khlebnikov struct dquot * const *dquots; 1725884d179dSJan Kara 1726189eef59SChristoph Hellwig if (!dquot_active(inode)) 172763936ddaSChristoph Hellwig return 0; 1728884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 1729bf097aafSJan Kara warn[cnt].w_type = QUOTA_NL_NOWARN; 1730b9ba6f94SNiu Yawei 17315bcd3b6fSKonstantin Khlebnikov dquots = i_dquot(inode); 1732b9ba6f94SNiu Yawei index = srcu_read_lock(&dquot_srcu); 17337b9ca4c6SJan Kara spin_lock(&inode->i_lock); 1734884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1735bf097aafSJan Kara if (!dquots[cnt]) 1736884d179dSJan Kara continue; 17377b9ca4c6SJan Kara ret = dquot_add_inodes(dquots[cnt], 1, &warn[cnt]); 17387b9ca4c6SJan Kara if (ret) { 17397b9ca4c6SJan Kara for (cnt--; cnt >= 0; cnt--) { 17407b9ca4c6SJan Kara if (!dquots[cnt]) 17417b9ca4c6SJan Kara continue; 17427b9ca4c6SJan Kara /* Back out changes we already did */ 17437b9ca4c6SJan Kara spin_lock(&dquots[cnt]->dq_dqb_lock); 1744632a9f3aSChengguang Xu dquot_decr_inodes(dquots[cnt], 1); 17457b9ca4c6SJan Kara spin_unlock(&dquots[cnt]->dq_dqb_lock); 17467b9ca4c6SJan Kara } 1747884d179dSJan Kara goto warn_put_all; 1748884d179dSJan Kara } 1749884d179dSJan Kara } 1750efd8f0e6SChristoph Hellwig 1751884d179dSJan Kara warn_put_all: 17527b9ca4c6SJan Kara spin_unlock(&inode->i_lock); 175363936ddaSChristoph Hellwig if (ret == 0) 1754bf097aafSJan Kara mark_all_dquot_dirty(dquots); 1755b9ba6f94SNiu Yawei srcu_read_unlock(&dquot_srcu, index); 1756bf097aafSJan Kara flush_warnings(warn); 1757884d179dSJan Kara return ret; 1758884d179dSJan Kara } 1759884d179dSJan Kara EXPORT_SYMBOL(dquot_alloc_inode); 1760884d179dSJan Kara 17615dd4056dSChristoph Hellwig /* 17625dd4056dSChristoph Hellwig * Convert in-memory reserved quotas to real consumed quotas 17635dd4056dSChristoph Hellwig */ 17645dd4056dSChristoph Hellwig int dquot_claim_space_nodirty(struct inode *inode, qsize_t number) 1765884d179dSJan Kara { 17665bcd3b6fSKonstantin Khlebnikov struct dquot **dquots; 1767b9ba6f94SNiu Yawei int cnt, index; 1768884d179dSJan Kara 1769189eef59SChristoph Hellwig if (!dquot_active(inode)) { 17700ed60de3SJan Kara spin_lock(&inode->i_lock); 17710ed60de3SJan Kara *inode_reserved_space(inode) -= number; 17720ed60de3SJan Kara __inode_add_bytes(inode, number); 17730ed60de3SJan Kara spin_unlock(&inode->i_lock); 17745dd4056dSChristoph Hellwig return 0; 1775884d179dSJan Kara } 1776884d179dSJan Kara 17775bcd3b6fSKonstantin Khlebnikov dquots = i_dquot(inode); 1778b9ba6f94SNiu Yawei index = srcu_read_lock(&dquot_srcu); 17797b9ca4c6SJan Kara spin_lock(&inode->i_lock); 1780884d179dSJan Kara /* Claim reserved quotas to allocated quotas */ 1781884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 17823ab167d2SJan Kara if (dquots[cnt]) { 17833ab167d2SJan Kara struct dquot *dquot = dquots[cnt]; 17843ab167d2SJan Kara 17857b9ca4c6SJan Kara spin_lock(&dquot->dq_dqb_lock); 17863ab167d2SJan Kara if (WARN_ON_ONCE(dquot->dq_dqb.dqb_rsvspace < number)) 17873ab167d2SJan Kara number = dquot->dq_dqb.dqb_rsvspace; 17883ab167d2SJan Kara dquot->dq_dqb.dqb_curspace += number; 17893ab167d2SJan Kara dquot->dq_dqb.dqb_rsvspace -= number; 17907b9ca4c6SJan Kara spin_unlock(&dquot->dq_dqb_lock); 17913ab167d2SJan Kara } 1792884d179dSJan Kara } 1793884d179dSJan Kara /* Update inode bytes */ 17940ed60de3SJan Kara *inode_reserved_space(inode) -= number; 17950ed60de3SJan Kara __inode_add_bytes(inode, number); 17960ed60de3SJan Kara spin_unlock(&inode->i_lock); 17975bcd3b6fSKonstantin Khlebnikov mark_all_dquot_dirty(dquots); 1798b9ba6f94SNiu Yawei srcu_read_unlock(&dquot_srcu, index); 17995dd4056dSChristoph Hellwig return 0; 1800884d179dSJan Kara } 18015dd4056dSChristoph Hellwig EXPORT_SYMBOL(dquot_claim_space_nodirty); 1802884d179dSJan Kara 1803884d179dSJan Kara /* 18041c8924ebSJan Kara * Convert allocated space back to in-memory reserved quotas 18051c8924ebSJan Kara */ 18061c8924ebSJan Kara void dquot_reclaim_space_nodirty(struct inode *inode, qsize_t number) 18071c8924ebSJan Kara { 18085bcd3b6fSKonstantin Khlebnikov struct dquot **dquots; 1809b9ba6f94SNiu Yawei int cnt, index; 18101c8924ebSJan Kara 18111c8924ebSJan Kara if (!dquot_active(inode)) { 18120ed60de3SJan Kara spin_lock(&inode->i_lock); 18130ed60de3SJan Kara *inode_reserved_space(inode) += number; 18140ed60de3SJan Kara __inode_sub_bytes(inode, number); 18150ed60de3SJan Kara spin_unlock(&inode->i_lock); 18161c8924ebSJan Kara return; 18171c8924ebSJan Kara } 18181c8924ebSJan Kara 18195bcd3b6fSKonstantin Khlebnikov dquots = i_dquot(inode); 1820b9ba6f94SNiu Yawei index = srcu_read_lock(&dquot_srcu); 18217b9ca4c6SJan Kara spin_lock(&inode->i_lock); 18221c8924ebSJan Kara /* Claim reserved quotas to allocated quotas */ 18231c8924ebSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 18243ab167d2SJan Kara if (dquots[cnt]) { 18253ab167d2SJan Kara struct dquot *dquot = dquots[cnt]; 18263ab167d2SJan Kara 18277b9ca4c6SJan Kara spin_lock(&dquot->dq_dqb_lock); 18283ab167d2SJan Kara if (WARN_ON_ONCE(dquot->dq_dqb.dqb_curspace < number)) 18293ab167d2SJan Kara number = dquot->dq_dqb.dqb_curspace; 18303ab167d2SJan Kara dquot->dq_dqb.dqb_rsvspace += number; 18313ab167d2SJan Kara dquot->dq_dqb.dqb_curspace -= number; 18327b9ca4c6SJan Kara spin_unlock(&dquot->dq_dqb_lock); 18333ab167d2SJan Kara } 18341c8924ebSJan Kara } 18351c8924ebSJan Kara /* Update inode bytes */ 18360ed60de3SJan Kara *inode_reserved_space(inode) += number; 18370ed60de3SJan Kara __inode_sub_bytes(inode, number); 18380ed60de3SJan Kara spin_unlock(&inode->i_lock); 18395bcd3b6fSKonstantin Khlebnikov mark_all_dquot_dirty(dquots); 1840b9ba6f94SNiu Yawei srcu_read_unlock(&dquot_srcu, index); 18411c8924ebSJan Kara return; 18421c8924ebSJan Kara } 18431c8924ebSJan Kara EXPORT_SYMBOL(dquot_reclaim_space_nodirty); 18441c8924ebSJan Kara 18451c8924ebSJan Kara /* 1846884d179dSJan Kara * This operation can block, but only after everything is updated 1847884d179dSJan Kara */ 184856246f9aSEric Sandeen void __dquot_free_space(struct inode *inode, qsize_t number, int flags) 1849884d179dSJan Kara { 1850884d179dSJan Kara unsigned int cnt; 1851bf097aafSJan Kara struct dquot_warn warn[MAXQUOTAS]; 18525bcd3b6fSKonstantin Khlebnikov struct dquot **dquots; 1853b9ba6f94SNiu Yawei int reserve = flags & DQUOT_SPACE_RESERVE, index; 1854884d179dSJan Kara 1855189eef59SChristoph Hellwig if (!dquot_active(inode)) { 1856a478e522SJan Kara if (reserve) { 1857a478e522SJan Kara spin_lock(&inode->i_lock); 1858a478e522SJan Kara *inode_reserved_space(inode) -= number; 1859a478e522SJan Kara spin_unlock(&inode->i_lock); 1860a478e522SJan Kara } else { 1861a478e522SJan Kara inode_sub_bytes(inode, number); 1862a478e522SJan Kara } 18635dd4056dSChristoph Hellwig return; 1864884d179dSJan Kara } 1865884d179dSJan Kara 18665bcd3b6fSKonstantin Khlebnikov dquots = i_dquot(inode); 1867b9ba6f94SNiu Yawei index = srcu_read_lock(&dquot_srcu); 18687b9ca4c6SJan Kara spin_lock(&inode->i_lock); 1869884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1870bf097aafSJan Kara int wtype; 1871bf097aafSJan Kara 1872bf097aafSJan Kara warn[cnt].w_type = QUOTA_NL_NOWARN; 1873bf097aafSJan Kara if (!dquots[cnt]) 1874884d179dSJan Kara continue; 18757b9ca4c6SJan Kara spin_lock(&dquots[cnt]->dq_dqb_lock); 1876bf097aafSJan Kara wtype = info_bdq_free(dquots[cnt], number); 1877bf097aafSJan Kara if (wtype != QUOTA_NL_NOWARN) 1878bf097aafSJan Kara prepare_warning(&warn[cnt], dquots[cnt], wtype); 1879fd8fbfc1SDmitry Monakhov if (reserve) 1880bf097aafSJan Kara dquot_free_reserved_space(dquots[cnt], number); 1881fd8fbfc1SDmitry Monakhov else 1882bf097aafSJan Kara dquot_decr_space(dquots[cnt], number); 18837b9ca4c6SJan Kara spin_unlock(&dquots[cnt]->dq_dqb_lock); 1884884d179dSJan Kara } 18857b9ca4c6SJan Kara if (reserve) 1886a478e522SJan Kara *inode_reserved_space(inode) -= number; 18877b9ca4c6SJan Kara else 18887b9ca4c6SJan Kara __inode_sub_bytes(inode, number); 1889a478e522SJan Kara spin_unlock(&inode->i_lock); 1890fd8fbfc1SDmitry Monakhov 1891fd8fbfc1SDmitry Monakhov if (reserve) 1892fd8fbfc1SDmitry Monakhov goto out_unlock; 1893bf097aafSJan Kara mark_all_dquot_dirty(dquots); 1894fd8fbfc1SDmitry Monakhov out_unlock: 1895b9ba6f94SNiu Yawei srcu_read_unlock(&dquot_srcu, index); 1896bf097aafSJan Kara flush_warnings(warn); 1897884d179dSJan Kara } 18985dd4056dSChristoph Hellwig EXPORT_SYMBOL(__dquot_free_space); 1899fd8fbfc1SDmitry Monakhov 1900fd8fbfc1SDmitry Monakhov /* 1901884d179dSJan Kara * This operation can block, but only after everything is updated 1902884d179dSJan Kara */ 19036bab3596SJan Kara void dquot_free_inode(struct inode *inode) 1904884d179dSJan Kara { 1905884d179dSJan Kara unsigned int cnt; 1906bf097aafSJan Kara struct dquot_warn warn[MAXQUOTAS]; 19075bcd3b6fSKonstantin Khlebnikov struct dquot * const *dquots; 1908b9ba6f94SNiu Yawei int index; 1909884d179dSJan Kara 1910189eef59SChristoph Hellwig if (!dquot_active(inode)) 191163936ddaSChristoph Hellwig return; 1912884d179dSJan Kara 19135bcd3b6fSKonstantin Khlebnikov dquots = i_dquot(inode); 1914b9ba6f94SNiu Yawei index = srcu_read_lock(&dquot_srcu); 19157b9ca4c6SJan Kara spin_lock(&inode->i_lock); 1916884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1917bf097aafSJan Kara int wtype; 1918bf097aafSJan Kara 1919bf097aafSJan Kara warn[cnt].w_type = QUOTA_NL_NOWARN; 1920bf097aafSJan Kara if (!dquots[cnt]) 1921884d179dSJan Kara continue; 19227b9ca4c6SJan Kara spin_lock(&dquots[cnt]->dq_dqb_lock); 1923bf097aafSJan Kara wtype = info_idq_free(dquots[cnt], 1); 1924bf097aafSJan Kara if (wtype != QUOTA_NL_NOWARN) 1925bf097aafSJan Kara prepare_warning(&warn[cnt], dquots[cnt], wtype); 1926bf097aafSJan Kara dquot_decr_inodes(dquots[cnt], 1); 19277b9ca4c6SJan Kara spin_unlock(&dquots[cnt]->dq_dqb_lock); 1928884d179dSJan Kara } 19297b9ca4c6SJan Kara spin_unlock(&inode->i_lock); 1930bf097aafSJan Kara mark_all_dquot_dirty(dquots); 1931b9ba6f94SNiu Yawei srcu_read_unlock(&dquot_srcu, index); 1932bf097aafSJan Kara flush_warnings(warn); 1933884d179dSJan Kara } 1934884d179dSJan Kara EXPORT_SYMBOL(dquot_free_inode); 1935884d179dSJan Kara 1936884d179dSJan Kara /* 1937884d179dSJan Kara * Transfer the number of inode and blocks from one diskquota to an other. 1938bc8e5f07SJan Kara * On success, dquot references in transfer_to are consumed and references 1939bc8e5f07SJan Kara * to original dquots that need to be released are placed there. On failure, 1940bc8e5f07SJan Kara * references are kept untouched. 1941884d179dSJan Kara * 1942884d179dSJan Kara * This operation can block, but only after everything is updated 1943884d179dSJan Kara * A transaction must be started when entering this function. 1944bc8e5f07SJan Kara * 1945b9ba6f94SNiu Yawei * We are holding reference on transfer_from & transfer_to, no need to 1946b9ba6f94SNiu Yawei * protect them by srcu_read_lock(). 1947884d179dSJan Kara */ 1948bc8e5f07SJan Kara int __dquot_transfer(struct inode *inode, struct dquot **transfer_to) 1949884d179dSJan Kara { 19507b9ca4c6SJan Kara qsize_t cur_space; 1951884d179dSJan Kara qsize_t rsv_space = 0; 19527a9ca53aSTahsin Erdogan qsize_t inode_usage = 1; 1953bc8e5f07SJan Kara struct dquot *transfer_from[MAXQUOTAS] = {}; 1954efd8f0e6SChristoph Hellwig int cnt, ret = 0; 19559e32784bSDmitry char is_valid[MAXQUOTAS] = {}; 1956bf097aafSJan Kara struct dquot_warn warn_to[MAXQUOTAS]; 1957bf097aafSJan Kara struct dquot_warn warn_from_inodes[MAXQUOTAS]; 1958bf097aafSJan Kara struct dquot_warn warn_from_space[MAXQUOTAS]; 1959884d179dSJan Kara 1960884d179dSJan Kara if (IS_NOQUOTA(inode)) 1961efd8f0e6SChristoph Hellwig return 0; 19627a9ca53aSTahsin Erdogan 19637a9ca53aSTahsin Erdogan if (inode->i_sb->dq_op->get_inode_usage) { 19647a9ca53aSTahsin Erdogan ret = inode->i_sb->dq_op->get_inode_usage(inode, &inode_usage); 19657a9ca53aSTahsin Erdogan if (ret) 19667a9ca53aSTahsin Erdogan return ret; 19677a9ca53aSTahsin Erdogan } 19687a9ca53aSTahsin Erdogan 1969884d179dSJan Kara /* Initialize the arrays */ 1970bf097aafSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1971bf097aafSJan Kara warn_to[cnt].w_type = QUOTA_NL_NOWARN; 1972bf097aafSJan Kara warn_from_inodes[cnt].w_type = QUOTA_NL_NOWARN; 1973bf097aafSJan Kara warn_from_space[cnt].w_type = QUOTA_NL_NOWARN; 1974bf097aafSJan Kara } 1975b9ba6f94SNiu Yawei 1976b9ba6f94SNiu Yawei spin_lock(&dq_data_lock); 19777b9ca4c6SJan Kara spin_lock(&inode->i_lock); 1978884d179dSJan Kara if (IS_NOQUOTA(inode)) { /* File without quota accounting? */ 19797b9ca4c6SJan Kara spin_unlock(&inode->i_lock); 1980b9ba6f94SNiu Yawei spin_unlock(&dq_data_lock); 1981bc8e5f07SJan Kara return 0; 1982884d179dSJan Kara } 19837b9ca4c6SJan Kara cur_space = __inode_get_bytes(inode); 19847b9ca4c6SJan Kara rsv_space = __inode_get_rsv_space(inode); 19857b9ca4c6SJan Kara /* 19867b9ca4c6SJan Kara * Build the transfer_from list, check limits, and update usage in 19877b9ca4c6SJan Kara * the target structures. 19887b9ca4c6SJan Kara */ 1989884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 19909e32784bSDmitry /* 19919e32784bSDmitry * Skip changes for same uid or gid or for turned off quota-type. 19929e32784bSDmitry */ 1993dd6f3c6dSJan Kara if (!transfer_to[cnt]) 1994884d179dSJan Kara continue; 19959e32784bSDmitry /* Avoid races with quotaoff() */ 19969e32784bSDmitry if (!sb_has_quota_active(inode->i_sb, cnt)) 19979e32784bSDmitry continue; 19989e32784bSDmitry is_valid[cnt] = 1; 19992d0fa467SJan Kara transfer_from[cnt] = i_dquot(inode)[cnt]; 20007b9ca4c6SJan Kara ret = dquot_add_inodes(transfer_to[cnt], inode_usage, 20017b9ca4c6SJan Kara &warn_to[cnt]); 2002efd8f0e6SChristoph Hellwig if (ret) 2003efd8f0e6SChristoph Hellwig goto over_quota; 2004c6d9c35dSyangerkun ret = dquot_add_space(transfer_to[cnt], cur_space, rsv_space, 2005c6d9c35dSyangerkun DQUOT_SPACE_WARN, &warn_to[cnt]); 20067b9ca4c6SJan Kara if (ret) { 20070a51fb71SKonstantin Khlebnikov spin_lock(&transfer_to[cnt]->dq_dqb_lock); 20087b9ca4c6SJan Kara dquot_decr_inodes(transfer_to[cnt], inode_usage); 20090a51fb71SKonstantin Khlebnikov spin_unlock(&transfer_to[cnt]->dq_dqb_lock); 2010884d179dSJan Kara goto over_quota; 2011884d179dSJan Kara } 20127b9ca4c6SJan Kara } 2013884d179dSJan Kara 20147b9ca4c6SJan Kara /* Decrease usage for source structures and update quota pointers */ 2015884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 20169e32784bSDmitry if (!is_valid[cnt]) 2017884d179dSJan Kara continue; 2018884d179dSJan Kara /* Due to IO error we might not have transfer_from[] structure */ 2019884d179dSJan Kara if (transfer_from[cnt]) { 2020bf097aafSJan Kara int wtype; 20217b9ca4c6SJan Kara 20227b9ca4c6SJan Kara spin_lock(&transfer_from[cnt]->dq_dqb_lock); 20237a9ca53aSTahsin Erdogan wtype = info_idq_free(transfer_from[cnt], inode_usage); 2024bf097aafSJan Kara if (wtype != QUOTA_NL_NOWARN) 2025bf097aafSJan Kara prepare_warning(&warn_from_inodes[cnt], 2026bf097aafSJan Kara transfer_from[cnt], wtype); 20277b9ca4c6SJan Kara wtype = info_bdq_free(transfer_from[cnt], 20287b9ca4c6SJan Kara cur_space + rsv_space); 2029bf097aafSJan Kara if (wtype != QUOTA_NL_NOWARN) 2030bf097aafSJan Kara prepare_warning(&warn_from_space[cnt], 2031bf097aafSJan Kara transfer_from[cnt], wtype); 20327a9ca53aSTahsin Erdogan dquot_decr_inodes(transfer_from[cnt], inode_usage); 2033884d179dSJan Kara dquot_decr_space(transfer_from[cnt], cur_space); 2034884d179dSJan Kara dquot_free_reserved_space(transfer_from[cnt], 2035884d179dSJan Kara rsv_space); 20367b9ca4c6SJan Kara spin_unlock(&transfer_from[cnt]->dq_dqb_lock); 2037884d179dSJan Kara } 20382d0fa467SJan Kara i_dquot(inode)[cnt] = transfer_to[cnt]; 2039884d179dSJan Kara } 20407b9ca4c6SJan Kara spin_unlock(&inode->i_lock); 2041884d179dSJan Kara spin_unlock(&dq_data_lock); 2042884d179dSJan Kara 2043dc52dd3aSDmitry Monakhov mark_all_dquot_dirty(transfer_from); 2044dc52dd3aSDmitry Monakhov mark_all_dquot_dirty(transfer_to); 2045bf097aafSJan Kara flush_warnings(warn_to); 2046bf097aafSJan Kara flush_warnings(warn_from_inodes); 2047bf097aafSJan Kara flush_warnings(warn_from_space); 2048bc8e5f07SJan Kara /* Pass back references to put */ 2049dc52dd3aSDmitry Monakhov for (cnt = 0; cnt < MAXQUOTAS; cnt++) 20509e32784bSDmitry if (is_valid[cnt]) 2051bc8e5f07SJan Kara transfer_to[cnt] = transfer_from[cnt]; 205286f3cbecSJan Kara return 0; 2053884d179dSJan Kara over_quota: 20547b9ca4c6SJan Kara /* Back out changes we already did */ 20557b9ca4c6SJan Kara for (cnt--; cnt >= 0; cnt--) { 20567b9ca4c6SJan Kara if (!is_valid[cnt]) 20577b9ca4c6SJan Kara continue; 20587b9ca4c6SJan Kara spin_lock(&transfer_to[cnt]->dq_dqb_lock); 20597b9ca4c6SJan Kara dquot_decr_inodes(transfer_to[cnt], inode_usage); 20607b9ca4c6SJan Kara dquot_decr_space(transfer_to[cnt], cur_space); 20617b9ca4c6SJan Kara dquot_free_reserved_space(transfer_to[cnt], rsv_space); 20627b9ca4c6SJan Kara spin_unlock(&transfer_to[cnt]->dq_dqb_lock); 20637b9ca4c6SJan Kara } 20647b9ca4c6SJan Kara spin_unlock(&inode->i_lock); 2065884d179dSJan Kara spin_unlock(&dq_data_lock); 2066bf097aafSJan Kara flush_warnings(warn_to); 206786f3cbecSJan Kara return ret; 2068884d179dSJan Kara } 2069bc8e5f07SJan Kara EXPORT_SYMBOL(__dquot_transfer); 2070884d179dSJan Kara 20718ddd69d6SDmitry Monakhov /* Wrapper for transferring ownership of an inode for uid/gid only 20728ddd69d6SDmitry Monakhov * Called from FSXXX_setattr() 20738ddd69d6SDmitry Monakhov */ 2074b43fa828SChristoph Hellwig int dquot_transfer(struct inode *inode, struct iattr *iattr) 2075884d179dSJan Kara { 2076bc8e5f07SJan Kara struct dquot *transfer_to[MAXQUOTAS] = {}; 20776184fc0bSJan Kara struct dquot *dquot; 2078bc8e5f07SJan Kara struct super_block *sb = inode->i_sb; 2079bc8e5f07SJan Kara int ret; 20808ddd69d6SDmitry Monakhov 2081189eef59SChristoph Hellwig if (!dquot_active(inode)) 2082884d179dSJan Kara return 0; 2083bc8e5f07SJan Kara 20846184fc0bSJan Kara if (iattr->ia_valid & ATTR_UID && !uid_eq(iattr->ia_uid, inode->i_uid)){ 20856184fc0bSJan Kara dquot = dqget(sb, make_kqid_uid(iattr->ia_uid)); 20866184fc0bSJan Kara if (IS_ERR(dquot)) { 20876184fc0bSJan Kara if (PTR_ERR(dquot) != -ESRCH) { 20886184fc0bSJan Kara ret = PTR_ERR(dquot); 20896184fc0bSJan Kara goto out_put; 20906184fc0bSJan Kara } 20916184fc0bSJan Kara dquot = NULL; 20926184fc0bSJan Kara } 20936184fc0bSJan Kara transfer_to[USRQUOTA] = dquot; 20946184fc0bSJan Kara } 20956184fc0bSJan Kara if (iattr->ia_valid & ATTR_GID && !gid_eq(iattr->ia_gid, inode->i_gid)){ 20966184fc0bSJan Kara dquot = dqget(sb, make_kqid_gid(iattr->ia_gid)); 20976184fc0bSJan Kara if (IS_ERR(dquot)) { 20986184fc0bSJan Kara if (PTR_ERR(dquot) != -ESRCH) { 20996184fc0bSJan Kara ret = PTR_ERR(dquot); 21006184fc0bSJan Kara goto out_put; 21016184fc0bSJan Kara } 21026184fc0bSJan Kara dquot = NULL; 21036184fc0bSJan Kara } 21046184fc0bSJan Kara transfer_to[GRPQUOTA] = dquot; 21056184fc0bSJan Kara } 2106bc8e5f07SJan Kara ret = __dquot_transfer(inode, transfer_to); 21076184fc0bSJan Kara out_put: 2108bc8e5f07SJan Kara dqput_all(transfer_to); 2109bc8e5f07SJan Kara return ret; 2110884d179dSJan Kara } 2111b43fa828SChristoph Hellwig EXPORT_SYMBOL(dquot_transfer); 2112884d179dSJan Kara 2113884d179dSJan Kara /* 2114884d179dSJan Kara * Write info of quota file to disk 2115884d179dSJan Kara */ 2116884d179dSJan Kara int dquot_commit_info(struct super_block *sb, int type) 2117884d179dSJan Kara { 2118884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 2119884d179dSJan Kara 21209a8ae30eSJan Kara return dqopt->ops[type]->write_file_info(sb, type); 2121884d179dSJan Kara } 2122884d179dSJan Kara EXPORT_SYMBOL(dquot_commit_info); 2123884d179dSJan Kara 2124be6257b2SJan Kara int dquot_get_next_id(struct super_block *sb, struct kqid *qid) 2125be6257b2SJan Kara { 2126be6257b2SJan Kara struct quota_info *dqopt = sb_dqopt(sb); 2127be6257b2SJan Kara 21289d1ccbe7SJan Kara if (!sb_has_quota_active(sb, qid->type)) 21299d1ccbe7SJan Kara return -ESRCH; 21309d1ccbe7SJan Kara if (!dqopt->ops[qid->type]->get_next_id) 21319d1ccbe7SJan Kara return -ENOSYS; 2132f14618c6SJan Kara return dqopt->ops[qid->type]->get_next_id(sb, qid); 2133be6257b2SJan Kara } 2134be6257b2SJan Kara EXPORT_SYMBOL(dquot_get_next_id); 2135be6257b2SJan Kara 2136884d179dSJan Kara /* 2137884d179dSJan Kara * Definitions of diskquota operations. 2138884d179dSJan Kara */ 213961e225dcSAlexey Dobriyan const struct dquot_operations dquot_operations = { 2140884d179dSJan Kara .write_dquot = dquot_commit, 2141884d179dSJan Kara .acquire_dquot = dquot_acquire, 2142884d179dSJan Kara .release_dquot = dquot_release, 2143884d179dSJan Kara .mark_dirty = dquot_mark_dquot_dirty, 2144884d179dSJan Kara .write_info = dquot_commit_info, 2145884d179dSJan Kara .alloc_dquot = dquot_alloc, 2146884d179dSJan Kara .destroy_dquot = dquot_destroy, 2147be6257b2SJan Kara .get_next_id = dquot_get_next_id, 2148884d179dSJan Kara }; 2149123e9cafSChristoph Hellwig EXPORT_SYMBOL(dquot_operations); 2150884d179dSJan Kara 2151884d179dSJan Kara /* 2152907f4554SChristoph Hellwig * Generic helper for ->open on filesystems supporting disk quotas. 2153907f4554SChristoph Hellwig */ 2154907f4554SChristoph Hellwig int dquot_file_open(struct inode *inode, struct file *file) 2155907f4554SChristoph Hellwig { 2156907f4554SChristoph Hellwig int error; 2157907f4554SChristoph Hellwig 2158907f4554SChristoph Hellwig error = generic_file_open(inode, file); 2159907f4554SChristoph Hellwig if (!error && (file->f_mode & FMODE_WRITE)) 216088d8ff97SChao Yu error = dquot_initialize(inode); 2161907f4554SChristoph Hellwig return error; 2162907f4554SChristoph Hellwig } 2163907f4554SChristoph Hellwig EXPORT_SYMBOL(dquot_file_open); 2164907f4554SChristoph Hellwig 21652ec1f301SJan Kara static void vfs_cleanup_quota_inode(struct super_block *sb, int type) 21662ec1f301SJan Kara { 21672ec1f301SJan Kara struct quota_info *dqopt = sb_dqopt(sb); 21682ec1f301SJan Kara struct inode *inode = dqopt->files[type]; 21692ec1f301SJan Kara 21702ec1f301SJan Kara if (!inode) 21712ec1f301SJan Kara return; 21722ec1f301SJan Kara if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) { 21732ec1f301SJan Kara inode_lock(inode); 21742ec1f301SJan Kara inode->i_flags &= ~S_NOQUOTA; 21752ec1f301SJan Kara inode_unlock(inode); 21762ec1f301SJan Kara } 21772ec1f301SJan Kara dqopt->files[type] = NULL; 21782ec1f301SJan Kara iput(inode); 21792ec1f301SJan Kara } 21802ec1f301SJan Kara 2181907f4554SChristoph Hellwig /* 2182884d179dSJan Kara * Turn quota off on a device. type == -1 ==> quotaoff for all types (umount) 2183884d179dSJan Kara */ 21840f0dd62fSChristoph Hellwig int dquot_disable(struct super_block *sb, int type, unsigned int flags) 2185884d179dSJan Kara { 21862ec1f301SJan Kara int cnt; 2187884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 2188884d179dSJan Kara 21897d6cd73dSJan Kara /* s_umount should be held in exclusive mode */ 21907d6cd73dSJan Kara if (WARN_ON_ONCE(down_read_trylock(&sb->s_umount))) 21917d6cd73dSJan Kara up_read(&sb->s_umount); 21927d6cd73dSJan Kara 2193884d179dSJan Kara /* Cannot turn off usage accounting without turning off limits, or 2194884d179dSJan Kara * suspend quotas and simultaneously turn quotas off. */ 2195884d179dSJan Kara if ((flags & DQUOT_USAGE_ENABLED && !(flags & DQUOT_LIMITS_ENABLED)) 2196884d179dSJan Kara || (flags & DQUOT_SUSPENDED && flags & (DQUOT_LIMITS_ENABLED | 2197884d179dSJan Kara DQUOT_USAGE_ENABLED))) 2198884d179dSJan Kara return -EINVAL; 2199884d179dSJan Kara 2200884d179dSJan Kara /* 2201884d179dSJan Kara * Skip everything if there's nothing to do. We have to do this because 2202884d179dSJan Kara * sometimes we are called when fill_super() failed and calling 2203884d179dSJan Kara * sync_fs() in such cases does no good. 2204884d179dSJan Kara */ 2205c3b00446SJan Kara if (!sb_any_quota_loaded(sb)) 2206884d179dSJan Kara return 0; 2207c3b00446SJan Kara 2208884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 2209884d179dSJan Kara if (type != -1 && cnt != type) 2210884d179dSJan Kara continue; 2211884d179dSJan Kara if (!sb_has_quota_loaded(sb, cnt)) 2212884d179dSJan Kara continue; 2213884d179dSJan Kara 2214884d179dSJan Kara if (flags & DQUOT_SUSPENDED) { 2215884d179dSJan Kara spin_lock(&dq_state_lock); 2216884d179dSJan Kara dqopt->flags |= 2217884d179dSJan Kara dquot_state_flag(DQUOT_SUSPENDED, cnt); 2218884d179dSJan Kara spin_unlock(&dq_state_lock); 2219884d179dSJan Kara } else { 2220884d179dSJan Kara spin_lock(&dq_state_lock); 2221884d179dSJan Kara dqopt->flags &= ~dquot_state_flag(flags, cnt); 2222884d179dSJan Kara /* Turning off suspended quotas? */ 2223884d179dSJan Kara if (!sb_has_quota_loaded(sb, cnt) && 2224884d179dSJan Kara sb_has_quota_suspended(sb, cnt)) { 2225884d179dSJan Kara dqopt->flags &= ~dquot_state_flag( 2226884d179dSJan Kara DQUOT_SUSPENDED, cnt); 2227884d179dSJan Kara spin_unlock(&dq_state_lock); 22282ec1f301SJan Kara vfs_cleanup_quota_inode(sb, cnt); 2229884d179dSJan Kara continue; 2230884d179dSJan Kara } 2231884d179dSJan Kara spin_unlock(&dq_state_lock); 2232884d179dSJan Kara } 2233884d179dSJan Kara 2234884d179dSJan Kara /* We still have to keep quota loaded? */ 2235884d179dSJan Kara if (sb_has_quota_loaded(sb, cnt) && !(flags & DQUOT_SUSPENDED)) 2236884d179dSJan Kara continue; 2237884d179dSJan Kara 2238884d179dSJan Kara /* Note: these are blocking operations */ 2239884d179dSJan Kara drop_dquot_ref(sb, cnt); 2240884d179dSJan Kara invalidate_dquots(sb, cnt); 2241884d179dSJan Kara /* 2242268157baSJan Kara * Now all dquots should be invalidated, all writes done so we 2243268157baSJan Kara * should be only users of the info. No locks needed. 2244884d179dSJan Kara */ 2245884d179dSJan Kara if (info_dirty(&dqopt->info[cnt])) 2246884d179dSJan Kara sb->dq_op->write_info(sb, cnt); 2247884d179dSJan Kara if (dqopt->ops[cnt]->free_file_info) 2248884d179dSJan Kara dqopt->ops[cnt]->free_file_info(sb, cnt); 2249884d179dSJan Kara put_quota_format(dqopt->info[cnt].dqi_format); 2250884d179dSJan Kara dqopt->info[cnt].dqi_flags = 0; 2251884d179dSJan Kara dqopt->info[cnt].dqi_igrace = 0; 2252884d179dSJan Kara dqopt->info[cnt].dqi_bgrace = 0; 2253884d179dSJan Kara dqopt->ops[cnt] = NULL; 2254884d179dSJan Kara } 2255884d179dSJan Kara 2256884d179dSJan Kara /* Skip syncing and setting flags if quota files are hidden */ 2257884d179dSJan Kara if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) 2258884d179dSJan Kara goto put_inodes; 2259884d179dSJan Kara 2260884d179dSJan Kara /* Sync the superblock so that buffers with quota data are written to 2261884d179dSJan Kara * disk (and so userspace sees correct data afterwards). */ 2262884d179dSJan Kara if (sb->s_op->sync_fs) 2263884d179dSJan Kara sb->s_op->sync_fs(sb, 1); 2264884d179dSJan Kara sync_blockdev(sb->s_bdev); 2265884d179dSJan Kara /* Now the quota files are just ordinary files and we can set the 2266884d179dSJan Kara * inode flags back. Moreover we discard the pagecache so that 2267884d179dSJan Kara * userspace sees the writes we did bypassing the pagecache. We 2268884d179dSJan Kara * must also discard the blockdev buffers so that we see the 2269884d179dSJan Kara * changes done by userspace on the next quotaon() */ 2270884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 22712ec1f301SJan Kara if (!sb_has_quota_loaded(sb, cnt) && dqopt->files[cnt]) { 22722ec1f301SJan Kara inode_lock(dqopt->files[cnt]); 22732ec1f301SJan Kara truncate_inode_pages(&dqopt->files[cnt]->i_data, 0); 22742ec1f301SJan Kara inode_unlock(dqopt->files[cnt]); 2275884d179dSJan Kara } 2276884d179dSJan Kara if (sb->s_bdev) 2277884d179dSJan Kara invalidate_bdev(sb->s_bdev); 2278884d179dSJan Kara put_inodes: 22792ec1f301SJan Kara /* We are done when suspending quotas */ 22802ec1f301SJan Kara if (flags & DQUOT_SUSPENDED) 22812ec1f301SJan Kara return 0; 22822ec1f301SJan Kara 2283884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 22842ec1f301SJan Kara if (!sb_has_quota_loaded(sb, cnt)) 22852ec1f301SJan Kara vfs_cleanup_quota_inode(sb, cnt); 22862ec1f301SJan Kara return 0; 2287884d179dSJan Kara } 22880f0dd62fSChristoph Hellwig EXPORT_SYMBOL(dquot_disable); 2289884d179dSJan Kara 2290287a8095SChristoph Hellwig int dquot_quota_off(struct super_block *sb, int type) 2291884d179dSJan Kara { 22920f0dd62fSChristoph Hellwig return dquot_disable(sb, type, 22930f0dd62fSChristoph Hellwig DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); 2294884d179dSJan Kara } 2295287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_quota_off); 22960f0dd62fSChristoph Hellwig 2297884d179dSJan Kara /* 2298884d179dSJan Kara * Turn quotas on on a device 2299884d179dSJan Kara */ 2300884d179dSJan Kara 2301c7d3d283SJan Kara static int vfs_setup_quota_inode(struct inode *inode, int type) 2302c7d3d283SJan Kara { 2303c7d3d283SJan Kara struct super_block *sb = inode->i_sb; 2304c7d3d283SJan Kara struct quota_info *dqopt = sb_dqopt(sb); 2305c7d3d283SJan Kara 2306c7d3d283SJan Kara if (!S_ISREG(inode->i_mode)) 2307c7d3d283SJan Kara return -EACCES; 2308c7d3d283SJan Kara if (IS_RDONLY(inode)) 2309c7d3d283SJan Kara return -EROFS; 2310c7d3d283SJan Kara if (sb_has_quota_loaded(sb, type)) 2311c7d3d283SJan Kara return -EBUSY; 2312c7d3d283SJan Kara 2313c7d3d283SJan Kara dqopt->files[type] = igrab(inode); 2314c7d3d283SJan Kara if (!dqopt->files[type]) 2315c7d3d283SJan Kara return -EIO; 2316c7d3d283SJan Kara if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) { 2317c7d3d283SJan Kara /* We don't want quota and atime on quota files (deadlocks 2318c7d3d283SJan Kara * possible) Also nobody should write to the file - we use 2319c7d3d283SJan Kara * special IO operations which ignore the immutable bit. */ 2320c7d3d283SJan Kara inode_lock(inode); 2321c7d3d283SJan Kara inode->i_flags |= S_NOQUOTA; 2322c7d3d283SJan Kara inode_unlock(inode); 2323884d179dSJan Kara /* 2324c7d3d283SJan Kara * When S_NOQUOTA is set, remove dquot references as no more 2325c7d3d283SJan Kara * references can be added 2326884d179dSJan Kara */ 2327c7d3d283SJan Kara __dquot_drop(inode); 2328c7d3d283SJan Kara } 2329c7d3d283SJan Kara return 0; 2330c7d3d283SJan Kara } 2331c7d3d283SJan Kara 2332c7d3d283SJan Kara int dquot_load_quota_sb(struct super_block *sb, int type, int format_id, 2333884d179dSJan Kara unsigned int flags) 2334884d179dSJan Kara { 2335884d179dSJan Kara struct quota_format_type *fmt = find_quota_format(format_id); 2336884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 2337884d179dSJan Kara int error; 2338884d179dSJan Kara 2339dc19432aSJan Kara /* Just unsuspend quotas? */ 2340dc19432aSJan Kara BUG_ON(flags & DQUOT_SUSPENDED); 2341dc19432aSJan Kara /* s_umount should be held in exclusive mode */ 2342dc19432aSJan Kara if (WARN_ON_ONCE(down_read_trylock(&sb->s_umount))) 2343dc19432aSJan Kara up_read(&sb->s_umount); 2344dc19432aSJan Kara 2345884d179dSJan Kara if (!fmt) 2346884d179dSJan Kara return -ESRCH; 2347847aac64SLi Xi if (!sb->s_op->quota_write || !sb->s_op->quota_read || 2348847aac64SLi Xi (type == PRJQUOTA && sb->dq_op->get_projid == NULL)) { 2349884d179dSJan Kara error = -EINVAL; 2350884d179dSJan Kara goto out_fmt; 2351884d179dSJan Kara } 23525c004828SEric W. Biederman /* Filesystems outside of init_user_ns not yet supported */ 23535c004828SEric W. Biederman if (sb->s_user_ns != &init_user_ns) { 23545c004828SEric W. Biederman error = -EINVAL; 23555c004828SEric W. Biederman goto out_fmt; 23565c004828SEric W. Biederman } 2357884d179dSJan Kara /* Usage always has to be set... */ 2358884d179dSJan Kara if (!(flags & DQUOT_USAGE_ENABLED)) { 2359884d179dSJan Kara error = -EINVAL; 2360884d179dSJan Kara goto out_fmt; 2361884d179dSJan Kara } 2362c3b00446SJan Kara if (sb_has_quota_loaded(sb, type)) { 2363c3b00446SJan Kara error = -EBUSY; 2364c3b00446SJan Kara goto out_fmt; 2365c3b00446SJan Kara } 2366884d179dSJan Kara 2367884d179dSJan Kara if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) { 2368ab94c39bSJan Kara /* As we bypass the pagecache we must now flush all the 2369ab94c39bSJan Kara * dirty data and invalidate caches so that kernel sees 2370ab94c39bSJan Kara * changes from userspace. It is not enough to just flush 2371ab94c39bSJan Kara * the quota file since if blocksize < pagesize, invalidation 2372ab94c39bSJan Kara * of the cache could fail because of other unrelated dirty 2373ab94c39bSJan Kara * data */ 2374ab94c39bSJan Kara sync_filesystem(sb); 2375884d179dSJan Kara invalidate_bdev(sb->s_bdev); 2376884d179dSJan Kara } 2377884d179dSJan Kara 2378884d179dSJan Kara error = -EINVAL; 2379884d179dSJan Kara if (!fmt->qf_ops->check_quota_file(sb, type)) 2380c7d3d283SJan Kara goto out_fmt; 2381884d179dSJan Kara 2382884d179dSJan Kara dqopt->ops[type] = fmt->qf_ops; 2383884d179dSJan Kara dqopt->info[type].dqi_format = fmt; 2384884d179dSJan Kara dqopt->info[type].dqi_fmt_id = format_id; 2385884d179dSJan Kara INIT_LIST_HEAD(&dqopt->info[type].dqi_dirty_list); 2386268157baSJan Kara error = dqopt->ops[type]->read_file_info(sb, type); 238742fdb858SJan Kara if (error < 0) 2388c7d3d283SJan Kara goto out_fmt; 238915512377SJan Kara if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) { 239015512377SJan Kara spin_lock(&dq_data_lock); 239146fe44ceSJan Kara dqopt->info[type].dqi_flags |= DQF_SYS_FILE; 239215512377SJan Kara spin_unlock(&dq_data_lock); 239315512377SJan Kara } 2394884d179dSJan Kara spin_lock(&dq_state_lock); 2395884d179dSJan Kara dqopt->flags |= dquot_state_flag(flags, type); 2396884d179dSJan Kara spin_unlock(&dq_state_lock); 2397884d179dSJan Kara 23981a6152d3SChao Yu error = add_dquot_ref(sb, type); 23991a6152d3SChao Yu if (error) 24001a6152d3SChao Yu dquot_disable(sb, type, flags); 2401884d179dSJan Kara 24021a6152d3SChao Yu return error; 2403884d179dSJan Kara out_fmt: 2404884d179dSJan Kara put_quota_format(fmt); 2405884d179dSJan Kara 2406884d179dSJan Kara return error; 2407884d179dSJan Kara } 2408c7d3d283SJan Kara EXPORT_SYMBOL(dquot_load_quota_sb); 2409c7d3d283SJan Kara 2410c7d3d283SJan Kara /* 2411dc19432aSJan Kara * More powerful function for turning on quotas on given quota inode allowing 2412dc19432aSJan Kara * setting of individual quota flags 2413c7d3d283SJan Kara */ 2414dc19432aSJan Kara int dquot_load_quota_inode(struct inode *inode, int type, int format_id, 2415c7d3d283SJan Kara unsigned int flags) 2416c7d3d283SJan Kara { 2417c7d3d283SJan Kara int err; 2418c7d3d283SJan Kara 2419c7d3d283SJan Kara err = vfs_setup_quota_inode(inode, type); 2420c7d3d283SJan Kara if (err < 0) 2421c7d3d283SJan Kara return err; 2422c7d3d283SJan Kara err = dquot_load_quota_sb(inode->i_sb, type, format_id, flags); 2423c7d3d283SJan Kara if (err < 0) 2424c7d3d283SJan Kara vfs_cleanup_quota_inode(inode->i_sb, type); 2425c7d3d283SJan Kara return err; 2426c7d3d283SJan Kara } 2427dc19432aSJan Kara EXPORT_SYMBOL(dquot_load_quota_inode); 2428884d179dSJan Kara 2429884d179dSJan Kara /* Reenable quotas on remount RW */ 24300f0dd62fSChristoph Hellwig int dquot_resume(struct super_block *sb, int type) 2431884d179dSJan Kara { 2432884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 24330f0dd62fSChristoph Hellwig int ret = 0, cnt; 2434884d179dSJan Kara unsigned int flags; 2435884d179dSJan Kara 24367d6cd73dSJan Kara /* s_umount should be held in exclusive mode */ 24377d6cd73dSJan Kara if (WARN_ON_ONCE(down_read_trylock(&sb->s_umount))) 24387d6cd73dSJan Kara up_read(&sb->s_umount); 24397d6cd73dSJan Kara 24400f0dd62fSChristoph Hellwig for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 24410f0dd62fSChristoph Hellwig if (type != -1 && cnt != type) 24420f0dd62fSChristoph Hellwig continue; 2443c3b00446SJan Kara if (!sb_has_quota_suspended(sb, cnt)) 24440f0dd62fSChristoph Hellwig continue; 2445c3b00446SJan Kara 2446884d179dSJan Kara spin_lock(&dq_state_lock); 2447884d179dSJan Kara flags = dqopt->flags & dquot_state_flag(DQUOT_USAGE_ENABLED | 24480f0dd62fSChristoph Hellwig DQUOT_LIMITS_ENABLED, 24490f0dd62fSChristoph Hellwig cnt); 24500f0dd62fSChristoph Hellwig dqopt->flags &= ~dquot_state_flag(DQUOT_STATE_FLAGS, cnt); 2451884d179dSJan Kara spin_unlock(&dq_state_lock); 2452884d179dSJan Kara 24530f0dd62fSChristoph Hellwig flags = dquot_generic_flag(flags, cnt); 2454ae45f07dSJan Kara ret = dquot_load_quota_sb(sb, cnt, dqopt->info[cnt].dqi_fmt_id, 2455ae45f07dSJan Kara flags); 2456ae45f07dSJan Kara if (ret < 0) 2457ae45f07dSJan Kara vfs_cleanup_quota_inode(sb, type); 24580f0dd62fSChristoph Hellwig } 2459884d179dSJan Kara 2460884d179dSJan Kara return ret; 2461884d179dSJan Kara } 24620f0dd62fSChristoph Hellwig EXPORT_SYMBOL(dquot_resume); 2463884d179dSJan Kara 2464f00c9e44SJan Kara int dquot_quota_on(struct super_block *sb, int type, int format_id, 24658c54ca9cSAl Viro const struct path *path) 2466884d179dSJan Kara { 2467884d179dSJan Kara int error = security_quota_on(path->dentry); 2468884d179dSJan Kara if (error) 2469884d179dSJan Kara return error; 2470884d179dSJan Kara /* Quota file not on the same filesystem? */ 2471d8c9584eSAl Viro if (path->dentry->d_sb != sb) 2472884d179dSJan Kara error = -EXDEV; 2473884d179dSJan Kara else 2474dc19432aSJan Kara error = dquot_load_quota_inode(d_inode(path->dentry), type, 2475884d179dSJan Kara format_id, DQUOT_USAGE_ENABLED | 2476884d179dSJan Kara DQUOT_LIMITS_ENABLED); 2477884d179dSJan Kara return error; 2478884d179dSJan Kara } 2479287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_quota_on); 2480884d179dSJan Kara 2481884d179dSJan Kara /* 2482884d179dSJan Kara * This function is used when filesystem needs to initialize quotas 2483884d179dSJan Kara * during mount time. 2484884d179dSJan Kara */ 2485287a8095SChristoph Hellwig int dquot_quota_on_mount(struct super_block *sb, char *qf_name, 2486884d179dSJan Kara int format_id, int type) 2487884d179dSJan Kara { 2488884d179dSJan Kara struct dentry *dentry; 2489884d179dSJan Kara int error; 2490884d179dSJan Kara 2491e12a4e8aSAl Viro dentry = lookup_one_len_unlocked(qf_name, sb->s_root, strlen(qf_name)); 2492884d179dSJan Kara if (IS_ERR(dentry)) 2493884d179dSJan Kara return PTR_ERR(dentry); 2494884d179dSJan Kara 2495dea655c2SDavid Howells if (d_really_is_negative(dentry)) { 2496884d179dSJan Kara error = -ENOENT; 2497884d179dSJan Kara goto out; 2498884d179dSJan Kara } 2499884d179dSJan Kara 2500884d179dSJan Kara error = security_quota_on(dentry); 2501884d179dSJan Kara if (!error) 2502dc19432aSJan Kara error = dquot_load_quota_inode(d_inode(dentry), type, format_id, 2503884d179dSJan Kara DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); 2504884d179dSJan Kara 2505884d179dSJan Kara out: 2506884d179dSJan Kara dput(dentry); 2507884d179dSJan Kara return error; 2508884d179dSJan Kara } 2509287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_quota_on_mount); 2510884d179dSJan Kara 25113e2af67eSJan Kara static int dquot_quota_enable(struct super_block *sb, unsigned int flags) 25123e2af67eSJan Kara { 25133e2af67eSJan Kara int ret; 25143e2af67eSJan Kara int type; 25153e2af67eSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 25163e2af67eSJan Kara 25173e2af67eSJan Kara if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) 25183e2af67eSJan Kara return -ENOSYS; 25193e2af67eSJan Kara /* Accounting cannot be turned on while fs is mounted */ 25203e2af67eSJan Kara flags &= ~(FS_QUOTA_UDQ_ACCT | FS_QUOTA_GDQ_ACCT | FS_QUOTA_PDQ_ACCT); 25213e2af67eSJan Kara if (!flags) 25223e2af67eSJan Kara return -EINVAL; 25233e2af67eSJan Kara for (type = 0; type < MAXQUOTAS; type++) { 25243e2af67eSJan Kara if (!(flags & qtype_enforce_flag(type))) 25253e2af67eSJan Kara continue; 25263e2af67eSJan Kara /* Can't enforce without accounting */ 2527069a9166SJan Kara if (!sb_has_quota_usage_enabled(sb, type)) { 2528069a9166SJan Kara ret = -EINVAL; 25293e2af67eSJan Kara goto out_err; 25303e2af67eSJan Kara } 2531069a9166SJan Kara if (sb_has_quota_limits_enabled(sb, type)) { 2532069a9166SJan Kara ret = -EBUSY; 2533069a9166SJan Kara goto out_err; 2534069a9166SJan Kara } 2535069a9166SJan Kara spin_lock(&dq_state_lock); 2536069a9166SJan Kara dqopt->flags |= dquot_state_flag(DQUOT_LIMITS_ENABLED, type); 2537069a9166SJan Kara spin_unlock(&dq_state_lock); 2538069a9166SJan Kara } 25393e2af67eSJan Kara return 0; 25403e2af67eSJan Kara out_err: 25413e2af67eSJan Kara /* Backout enforcement enablement we already did */ 25423e2af67eSJan Kara for (type--; type >= 0; type--) { 25433e2af67eSJan Kara if (flags & qtype_enforce_flag(type)) 25443e2af67eSJan Kara dquot_disable(sb, type, DQUOT_LIMITS_ENABLED); 25453e2af67eSJan Kara } 25463e2af67eSJan Kara /* Error code translation for better compatibility with XFS */ 25473e2af67eSJan Kara if (ret == -EBUSY) 25483e2af67eSJan Kara ret = -EEXIST; 25493e2af67eSJan Kara return ret; 25503e2af67eSJan Kara } 25513e2af67eSJan Kara 25523e2af67eSJan Kara static int dquot_quota_disable(struct super_block *sb, unsigned int flags) 25533e2af67eSJan Kara { 25543e2af67eSJan Kara int ret; 25553e2af67eSJan Kara int type; 25563e2af67eSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 25573e2af67eSJan Kara 25583e2af67eSJan Kara if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) 25593e2af67eSJan Kara return -ENOSYS; 25603e2af67eSJan Kara /* 25613e2af67eSJan Kara * We don't support turning off accounting via quotactl. In principle 25623e2af67eSJan Kara * quota infrastructure can do this but filesystems don't expect 25633e2af67eSJan Kara * userspace to be able to do it. 25643e2af67eSJan Kara */ 25653e2af67eSJan Kara if (flags & 25663e2af67eSJan Kara (FS_QUOTA_UDQ_ACCT | FS_QUOTA_GDQ_ACCT | FS_QUOTA_PDQ_ACCT)) 25673e2af67eSJan Kara return -EOPNOTSUPP; 25683e2af67eSJan Kara 25693e2af67eSJan Kara /* Filter out limits not enabled */ 25703e2af67eSJan Kara for (type = 0; type < MAXQUOTAS; type++) 25713e2af67eSJan Kara if (!sb_has_quota_limits_enabled(sb, type)) 25723e2af67eSJan Kara flags &= ~qtype_enforce_flag(type); 25733e2af67eSJan Kara /* Nothing left? */ 25743e2af67eSJan Kara if (!flags) 25753e2af67eSJan Kara return -EEXIST; 25763e2af67eSJan Kara for (type = 0; type < MAXQUOTAS; type++) { 25773e2af67eSJan Kara if (flags & qtype_enforce_flag(type)) { 25783e2af67eSJan Kara ret = dquot_disable(sb, type, DQUOT_LIMITS_ENABLED); 25793e2af67eSJan Kara if (ret < 0) 25803e2af67eSJan Kara goto out_err; 25813e2af67eSJan Kara } 25823e2af67eSJan Kara } 25833e2af67eSJan Kara return 0; 25843e2af67eSJan Kara out_err: 25853e2af67eSJan Kara /* Backout enforcement disabling we already did */ 25863e2af67eSJan Kara for (type--; type >= 0; type--) { 2587069a9166SJan Kara if (flags & qtype_enforce_flag(type)) { 2588069a9166SJan Kara spin_lock(&dq_state_lock); 2589069a9166SJan Kara dqopt->flags |= 2590069a9166SJan Kara dquot_state_flag(DQUOT_LIMITS_ENABLED, type); 2591069a9166SJan Kara spin_unlock(&dq_state_lock); 2592069a9166SJan Kara } 25933e2af67eSJan Kara } 25943e2af67eSJan Kara return ret; 25953e2af67eSJan Kara } 25963e2af67eSJan Kara 2597884d179dSJan Kara /* Generic routine for getting common part of quota structure */ 259814bf61ffSJan Kara static void do_get_dqblk(struct dquot *dquot, struct qc_dqblk *di) 2599884d179dSJan Kara { 2600884d179dSJan Kara struct mem_dqblk *dm = &dquot->dq_dqb; 2601884d179dSJan Kara 2602b9b2dd36SChristoph Hellwig memset(di, 0, sizeof(*di)); 26037b9ca4c6SJan Kara spin_lock(&dquot->dq_dqb_lock); 260414bf61ffSJan Kara di->d_spc_hardlimit = dm->dqb_bhardlimit; 260514bf61ffSJan Kara di->d_spc_softlimit = dm->dqb_bsoftlimit; 2606b9b2dd36SChristoph Hellwig di->d_ino_hardlimit = dm->dqb_ihardlimit; 2607b9b2dd36SChristoph Hellwig di->d_ino_softlimit = dm->dqb_isoftlimit; 260814bf61ffSJan Kara di->d_space = dm->dqb_curspace + dm->dqb_rsvspace; 260914bf61ffSJan Kara di->d_ino_count = dm->dqb_curinodes; 261014bf61ffSJan Kara di->d_spc_timer = dm->dqb_btime; 261114bf61ffSJan Kara di->d_ino_timer = dm->dqb_itime; 26127b9ca4c6SJan Kara spin_unlock(&dquot->dq_dqb_lock); 2613884d179dSJan Kara } 2614884d179dSJan Kara 261574a8a103SEric W. Biederman int dquot_get_dqblk(struct super_block *sb, struct kqid qid, 261614bf61ffSJan Kara struct qc_dqblk *di) 2617884d179dSJan Kara { 2618884d179dSJan Kara struct dquot *dquot; 2619884d179dSJan Kara 2620aca645a6SEric W. Biederman dquot = dqget(sb, qid); 26216184fc0bSJan Kara if (IS_ERR(dquot)) 26226184fc0bSJan Kara return PTR_ERR(dquot); 2623884d179dSJan Kara do_get_dqblk(dquot, di); 2624884d179dSJan Kara dqput(dquot); 2625884d179dSJan Kara 2626884d179dSJan Kara return 0; 2627884d179dSJan Kara } 2628287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_get_dqblk); 2629884d179dSJan Kara 2630be6257b2SJan Kara int dquot_get_next_dqblk(struct super_block *sb, struct kqid *qid, 2631be6257b2SJan Kara struct qc_dqblk *di) 2632be6257b2SJan Kara { 2633be6257b2SJan Kara struct dquot *dquot; 2634be6257b2SJan Kara int err; 2635be6257b2SJan Kara 2636be6257b2SJan Kara if (!sb->dq_op->get_next_id) 2637be6257b2SJan Kara return -ENOSYS; 2638be6257b2SJan Kara err = sb->dq_op->get_next_id(sb, qid); 2639be6257b2SJan Kara if (err < 0) 2640be6257b2SJan Kara return err; 2641be6257b2SJan Kara dquot = dqget(sb, *qid); 2642be6257b2SJan Kara if (IS_ERR(dquot)) 2643be6257b2SJan Kara return PTR_ERR(dquot); 2644be6257b2SJan Kara do_get_dqblk(dquot, di); 2645be6257b2SJan Kara dqput(dquot); 2646be6257b2SJan Kara 2647be6257b2SJan Kara return 0; 2648be6257b2SJan Kara } 2649be6257b2SJan Kara EXPORT_SYMBOL(dquot_get_next_dqblk); 2650be6257b2SJan Kara 265114bf61ffSJan Kara #define VFS_QC_MASK \ 265214bf61ffSJan Kara (QC_SPACE | QC_SPC_SOFT | QC_SPC_HARD | \ 265314bf61ffSJan Kara QC_INO_COUNT | QC_INO_SOFT | QC_INO_HARD | \ 265414bf61ffSJan Kara QC_SPC_TIMER | QC_INO_TIMER) 2655c472b432SChristoph Hellwig 2656884d179dSJan Kara /* Generic routine for setting common part of quota structure */ 265714bf61ffSJan Kara static int do_set_dqblk(struct dquot *dquot, struct qc_dqblk *di) 2658884d179dSJan Kara { 2659884d179dSJan Kara struct mem_dqblk *dm = &dquot->dq_dqb; 2660884d179dSJan Kara int check_blim = 0, check_ilim = 0; 26614c376dcaSEric W. Biederman struct mem_dqinfo *dqi = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_id.type]; 2662884d179dSJan Kara 266314bf61ffSJan Kara if (di->d_fieldmask & ~VFS_QC_MASK) 2664c472b432SChristoph Hellwig return -EINVAL; 2665c472b432SChristoph Hellwig 266614bf61ffSJan Kara if (((di->d_fieldmask & QC_SPC_SOFT) && 2667b10a0819SJan Kara di->d_spc_softlimit > dqi->dqi_max_spc_limit) || 266814bf61ffSJan Kara ((di->d_fieldmask & QC_SPC_HARD) && 2669b10a0819SJan Kara di->d_spc_hardlimit > dqi->dqi_max_spc_limit) || 267014bf61ffSJan Kara ((di->d_fieldmask & QC_INO_SOFT) && 2671b10a0819SJan Kara (di->d_ino_softlimit > dqi->dqi_max_ino_limit)) || 267214bf61ffSJan Kara ((di->d_fieldmask & QC_INO_HARD) && 2673b10a0819SJan Kara (di->d_ino_hardlimit > dqi->dqi_max_ino_limit))) 2674884d179dSJan Kara return -ERANGE; 2675884d179dSJan Kara 26767b9ca4c6SJan Kara spin_lock(&dquot->dq_dqb_lock); 267714bf61ffSJan Kara if (di->d_fieldmask & QC_SPACE) { 267814bf61ffSJan Kara dm->dqb_curspace = di->d_space - dm->dqb_rsvspace; 2679884d179dSJan Kara check_blim = 1; 268008261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags); 2681884d179dSJan Kara } 2682c472b432SChristoph Hellwig 268314bf61ffSJan Kara if (di->d_fieldmask & QC_SPC_SOFT) 268414bf61ffSJan Kara dm->dqb_bsoftlimit = di->d_spc_softlimit; 268514bf61ffSJan Kara if (di->d_fieldmask & QC_SPC_HARD) 268614bf61ffSJan Kara dm->dqb_bhardlimit = di->d_spc_hardlimit; 268714bf61ffSJan Kara if (di->d_fieldmask & (QC_SPC_SOFT | QC_SPC_HARD)) { 2688884d179dSJan Kara check_blim = 1; 268908261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags); 2690884d179dSJan Kara } 2691c472b432SChristoph Hellwig 269214bf61ffSJan Kara if (di->d_fieldmask & QC_INO_COUNT) { 269314bf61ffSJan Kara dm->dqb_curinodes = di->d_ino_count; 2694884d179dSJan Kara check_ilim = 1; 269508261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags); 2696884d179dSJan Kara } 2697c472b432SChristoph Hellwig 269814bf61ffSJan Kara if (di->d_fieldmask & QC_INO_SOFT) 2699c472b432SChristoph Hellwig dm->dqb_isoftlimit = di->d_ino_softlimit; 270014bf61ffSJan Kara if (di->d_fieldmask & QC_INO_HARD) 2701c472b432SChristoph Hellwig dm->dqb_ihardlimit = di->d_ino_hardlimit; 270214bf61ffSJan Kara if (di->d_fieldmask & (QC_INO_SOFT | QC_INO_HARD)) { 2703884d179dSJan Kara check_ilim = 1; 270408261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags); 2705884d179dSJan Kara } 2706c472b432SChristoph Hellwig 270714bf61ffSJan Kara if (di->d_fieldmask & QC_SPC_TIMER) { 270814bf61ffSJan Kara dm->dqb_btime = di->d_spc_timer; 2709884d179dSJan Kara check_blim = 1; 271008261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags); 2711884d179dSJan Kara } 2712c472b432SChristoph Hellwig 271314bf61ffSJan Kara if (di->d_fieldmask & QC_INO_TIMER) { 271414bf61ffSJan Kara dm->dqb_itime = di->d_ino_timer; 2715884d179dSJan Kara check_ilim = 1; 271608261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags); 2717884d179dSJan Kara } 2718884d179dSJan Kara 2719884d179dSJan Kara if (check_blim) { 2720268157baSJan Kara if (!dm->dqb_bsoftlimit || 27214b8e1106SChengguang Xu dm->dqb_curspace + dm->dqb_rsvspace <= dm->dqb_bsoftlimit) { 2722884d179dSJan Kara dm->dqb_btime = 0; 2723884d179dSJan Kara clear_bit(DQ_BLKS_B, &dquot->dq_flags); 272414bf61ffSJan Kara } else if (!(di->d_fieldmask & QC_SPC_TIMER)) 2725268157baSJan Kara /* Set grace only if user hasn't provided his own... */ 2726e008bb61SArnd Bergmann dm->dqb_btime = ktime_get_real_seconds() + dqi->dqi_bgrace; 2727884d179dSJan Kara } 2728884d179dSJan Kara if (check_ilim) { 2729268157baSJan Kara if (!dm->dqb_isoftlimit || 27304b8e1106SChengguang Xu dm->dqb_curinodes <= dm->dqb_isoftlimit) { 2731884d179dSJan Kara dm->dqb_itime = 0; 2732884d179dSJan Kara clear_bit(DQ_INODES_B, &dquot->dq_flags); 273314bf61ffSJan Kara } else if (!(di->d_fieldmask & QC_INO_TIMER)) 2734268157baSJan Kara /* Set grace only if user hasn't provided his own... */ 2735e008bb61SArnd Bergmann dm->dqb_itime = ktime_get_real_seconds() + dqi->dqi_igrace; 2736884d179dSJan Kara } 2737268157baSJan Kara if (dm->dqb_bhardlimit || dm->dqb_bsoftlimit || dm->dqb_ihardlimit || 2738268157baSJan Kara dm->dqb_isoftlimit) 2739884d179dSJan Kara clear_bit(DQ_FAKE_B, &dquot->dq_flags); 2740884d179dSJan Kara else 2741884d179dSJan Kara set_bit(DQ_FAKE_B, &dquot->dq_flags); 27427b9ca4c6SJan Kara spin_unlock(&dquot->dq_dqb_lock); 2743884d179dSJan Kara mark_dquot_dirty(dquot); 2744884d179dSJan Kara 2745884d179dSJan Kara return 0; 2746884d179dSJan Kara } 2747884d179dSJan Kara 274874a8a103SEric W. Biederman int dquot_set_dqblk(struct super_block *sb, struct kqid qid, 274914bf61ffSJan Kara struct qc_dqblk *di) 2750884d179dSJan Kara { 2751884d179dSJan Kara struct dquot *dquot; 2752884d179dSJan Kara int rc; 2753884d179dSJan Kara 2754aca645a6SEric W. Biederman dquot = dqget(sb, qid); 27556184fc0bSJan Kara if (IS_ERR(dquot)) { 27566184fc0bSJan Kara rc = PTR_ERR(dquot); 2757884d179dSJan Kara goto out; 2758884d179dSJan Kara } 2759884d179dSJan Kara rc = do_set_dqblk(dquot, di); 2760884d179dSJan Kara dqput(dquot); 2761884d179dSJan Kara out: 2762884d179dSJan Kara return rc; 2763884d179dSJan Kara } 2764287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_set_dqblk); 2765884d179dSJan Kara 2766884d179dSJan Kara /* Generic routine for getting common part of quota file information */ 27670a240339SJan Kara int dquot_get_state(struct super_block *sb, struct qc_state *state) 2768884d179dSJan Kara { 2769884d179dSJan Kara struct mem_dqinfo *mi; 27700a240339SJan Kara struct qc_type_state *tstate; 27710a240339SJan Kara struct quota_info *dqopt = sb_dqopt(sb); 27720a240339SJan Kara int type; 2773884d179dSJan Kara 27740a240339SJan Kara memset(state, 0, sizeof(*state)); 27750a240339SJan Kara for (type = 0; type < MAXQUOTAS; type++) { 27760a240339SJan Kara if (!sb_has_quota_active(sb, type)) 27770a240339SJan Kara continue; 27780a240339SJan Kara tstate = state->s_state + type; 2779884d179dSJan Kara mi = sb_dqopt(sb)->info + type; 27800a240339SJan Kara tstate->flags = QCI_ACCT_ENABLED; 2781884d179dSJan Kara spin_lock(&dq_data_lock); 27820a240339SJan Kara if (mi->dqi_flags & DQF_SYS_FILE) 27830a240339SJan Kara tstate->flags |= QCI_SYSFILE; 27840a240339SJan Kara if (mi->dqi_flags & DQF_ROOT_SQUASH) 27850a240339SJan Kara tstate->flags |= QCI_ROOT_SQUASH; 27860a240339SJan Kara if (sb_has_quota_limits_enabled(sb, type)) 27870a240339SJan Kara tstate->flags |= QCI_LIMITS_ENFORCED; 27880a240339SJan Kara tstate->spc_timelimit = mi->dqi_bgrace; 27890a240339SJan Kara tstate->ino_timelimit = mi->dqi_igrace; 2790*a0828b6cSJan Kara if (dqopt->files[type]) { 27910a240339SJan Kara tstate->ino = dqopt->files[type]->i_ino; 27920a240339SJan Kara tstate->blocks = dqopt->files[type]->i_blocks; 2793*a0828b6cSJan Kara } 27940a240339SJan Kara tstate->nextents = 1; /* We don't know... */ 2795884d179dSJan Kara spin_unlock(&dq_data_lock); 27960a240339SJan Kara } 2797884d179dSJan Kara return 0; 2798884d179dSJan Kara } 27990a240339SJan Kara EXPORT_SYMBOL(dquot_get_state); 2800884d179dSJan Kara 2801884d179dSJan Kara /* Generic routine for setting common part of quota file information */ 28025eacb2acSJan Kara int dquot_set_dqinfo(struct super_block *sb, int type, struct qc_info *ii) 2803884d179dSJan Kara { 2804884d179dSJan Kara struct mem_dqinfo *mi; 2805884d179dSJan Kara int err = 0; 2806884d179dSJan Kara 28075eacb2acSJan Kara if ((ii->i_fieldmask & QC_WARNS_MASK) || 28085eacb2acSJan Kara (ii->i_fieldmask & QC_RT_SPC_TIMER)) 28095eacb2acSJan Kara return -EINVAL; 28109d1ccbe7SJan Kara if (!sb_has_quota_active(sb, type)) 28119d1ccbe7SJan Kara return -ESRCH; 2812884d179dSJan Kara mi = sb_dqopt(sb)->info + type; 28135eacb2acSJan Kara if (ii->i_fieldmask & QC_FLAGS) { 28145eacb2acSJan Kara if ((ii->i_flags & QCI_ROOT_SQUASH && 28159d1ccbe7SJan Kara mi->dqi_format->qf_fmt_id != QFMT_VFS_OLD)) 28169d1ccbe7SJan Kara return -EINVAL; 2817ca6cb091SJan Kara } 2818884d179dSJan Kara spin_lock(&dq_data_lock); 28195eacb2acSJan Kara if (ii->i_fieldmask & QC_SPC_TIMER) 28205eacb2acSJan Kara mi->dqi_bgrace = ii->i_spc_timelimit; 28215eacb2acSJan Kara if (ii->i_fieldmask & QC_INO_TIMER) 28225eacb2acSJan Kara mi->dqi_igrace = ii->i_ino_timelimit; 28235eacb2acSJan Kara if (ii->i_fieldmask & QC_FLAGS) { 28245eacb2acSJan Kara if (ii->i_flags & QCI_ROOT_SQUASH) 28255eacb2acSJan Kara mi->dqi_flags |= DQF_ROOT_SQUASH; 28265eacb2acSJan Kara else 28275eacb2acSJan Kara mi->dqi_flags &= ~DQF_ROOT_SQUASH; 28285eacb2acSJan Kara } 2829884d179dSJan Kara spin_unlock(&dq_data_lock); 2830884d179dSJan Kara mark_info_dirty(sb, type); 2831884d179dSJan Kara /* Force write to disk */ 2832884d179dSJan Kara sb->dq_op->write_info(sb, type); 2833884d179dSJan Kara return err; 2834884d179dSJan Kara } 2835287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_set_dqinfo); 2836884d179dSJan Kara 28373e2af67eSJan Kara const struct quotactl_ops dquot_quotactl_sysfile_ops = { 28383e2af67eSJan Kara .quota_enable = dquot_quota_enable, 28393e2af67eSJan Kara .quota_disable = dquot_quota_disable, 28403e2af67eSJan Kara .quota_sync = dquot_quota_sync, 28410a240339SJan Kara .get_state = dquot_get_state, 28423e2af67eSJan Kara .set_info = dquot_set_dqinfo, 28433e2af67eSJan Kara .get_dqblk = dquot_get_dqblk, 2844be6257b2SJan Kara .get_nextdqblk = dquot_get_next_dqblk, 28453e2af67eSJan Kara .set_dqblk = dquot_set_dqblk 28463e2af67eSJan Kara }; 28473e2af67eSJan Kara EXPORT_SYMBOL(dquot_quotactl_sysfile_ops); 28483e2af67eSJan Kara 2849dde95888SDmitry Monakhov static int do_proc_dqstats(struct ctl_table *table, int write, 2850dde95888SDmitry Monakhov void __user *buffer, size_t *lenp, loff_t *ppos) 2851dde95888SDmitry Monakhov { 2852dde95888SDmitry Monakhov unsigned int type = (int *)table->data - dqstats.stat; 2853f32764bdSDmitry Monakhov 2854f32764bdSDmitry Monakhov /* Update global table */ 2855f32764bdSDmitry Monakhov dqstats.stat[type] = 2856f32764bdSDmitry Monakhov percpu_counter_sum_positive(&dqstats.counter[type]); 2857dde95888SDmitry Monakhov return proc_dointvec(table, write, buffer, lenp, ppos); 2858dde95888SDmitry Monakhov } 2859dde95888SDmitry Monakhov 2860e628753bSJoe Perches static struct ctl_table fs_dqstats_table[] = { 2861884d179dSJan Kara { 2862884d179dSJan Kara .procname = "lookups", 2863dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_LOOKUPS], 2864884d179dSJan Kara .maxlen = sizeof(int), 2865884d179dSJan Kara .mode = 0444, 2866dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2867884d179dSJan Kara }, 2868884d179dSJan Kara { 2869884d179dSJan Kara .procname = "drops", 2870dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_DROPS], 2871884d179dSJan Kara .maxlen = sizeof(int), 2872884d179dSJan Kara .mode = 0444, 2873dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2874884d179dSJan Kara }, 2875884d179dSJan Kara { 2876884d179dSJan Kara .procname = "reads", 2877dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_READS], 2878884d179dSJan Kara .maxlen = sizeof(int), 2879884d179dSJan Kara .mode = 0444, 2880dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2881884d179dSJan Kara }, 2882884d179dSJan Kara { 2883884d179dSJan Kara .procname = "writes", 2884dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_WRITES], 2885884d179dSJan Kara .maxlen = sizeof(int), 2886884d179dSJan Kara .mode = 0444, 2887dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2888884d179dSJan Kara }, 2889884d179dSJan Kara { 2890884d179dSJan Kara .procname = "cache_hits", 2891dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_CACHE_HITS], 2892884d179dSJan Kara .maxlen = sizeof(int), 2893884d179dSJan Kara .mode = 0444, 2894dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2895884d179dSJan Kara }, 2896884d179dSJan Kara { 2897884d179dSJan Kara .procname = "allocated_dquots", 2898dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_ALLOC_DQUOTS], 2899884d179dSJan Kara .maxlen = sizeof(int), 2900884d179dSJan Kara .mode = 0444, 2901dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2902884d179dSJan Kara }, 2903884d179dSJan Kara { 2904884d179dSJan Kara .procname = "free_dquots", 2905dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_FREE_DQUOTS], 2906884d179dSJan Kara .maxlen = sizeof(int), 2907884d179dSJan Kara .mode = 0444, 2908dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2909884d179dSJan Kara }, 2910884d179dSJan Kara { 2911884d179dSJan Kara .procname = "syncs", 2912dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_SYNCS], 2913884d179dSJan Kara .maxlen = sizeof(int), 2914884d179dSJan Kara .mode = 0444, 2915dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2916884d179dSJan Kara }, 2917884d179dSJan Kara #ifdef CONFIG_PRINT_QUOTA_WARNING 2918884d179dSJan Kara { 2919884d179dSJan Kara .procname = "warnings", 2920884d179dSJan Kara .data = &flag_print_warnings, 2921884d179dSJan Kara .maxlen = sizeof(int), 2922884d179dSJan Kara .mode = 0644, 29236d456111SEric W. Biederman .proc_handler = proc_dointvec, 2924884d179dSJan Kara }, 2925884d179dSJan Kara #endif 2926ab09203eSEric W. Biederman { }, 2927884d179dSJan Kara }; 2928884d179dSJan Kara 2929e628753bSJoe Perches static struct ctl_table fs_table[] = { 2930884d179dSJan Kara { 2931884d179dSJan Kara .procname = "quota", 2932884d179dSJan Kara .mode = 0555, 2933884d179dSJan Kara .child = fs_dqstats_table, 2934884d179dSJan Kara }, 2935ab09203eSEric W. Biederman { }, 2936884d179dSJan Kara }; 2937884d179dSJan Kara 2938e628753bSJoe Perches static struct ctl_table sys_table[] = { 2939884d179dSJan Kara { 2940884d179dSJan Kara .procname = "fs", 2941884d179dSJan Kara .mode = 0555, 2942884d179dSJan Kara .child = fs_table, 2943884d179dSJan Kara }, 2944ab09203eSEric W. Biederman { }, 2945884d179dSJan Kara }; 2946884d179dSJan Kara 2947884d179dSJan Kara static int __init dquot_init(void) 2948884d179dSJan Kara { 2949f32764bdSDmitry Monakhov int i, ret; 2950884d179dSJan Kara unsigned long nr_hash, order; 2951884d179dSJan Kara 2952884d179dSJan Kara printk(KERN_NOTICE "VFS: Disk quotas %s\n", __DQUOT_VERSION__); 2953884d179dSJan Kara 2954884d179dSJan Kara register_sysctl_table(sys_table); 2955884d179dSJan Kara 2956884d179dSJan Kara dquot_cachep = kmem_cache_create("dquot", 2957884d179dSJan Kara sizeof(struct dquot), sizeof(unsigned long) * 4, 2958884d179dSJan Kara (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| 2959884d179dSJan Kara SLAB_MEM_SPREAD|SLAB_PANIC), 2960884d179dSJan Kara NULL); 2961884d179dSJan Kara 2962884d179dSJan Kara order = 0; 29631aa3b3e0SJia-Ju Bai dquot_hash = (struct hlist_head *)__get_free_pages(GFP_KERNEL, order); 2964884d179dSJan Kara if (!dquot_hash) 2965884d179dSJan Kara panic("Cannot create dquot hash table"); 2966884d179dSJan Kara 2967f32764bdSDmitry Monakhov for (i = 0; i < _DQST_DQSTAT_LAST; i++) { 2968908c7f19STejun Heo ret = percpu_counter_init(&dqstats.counter[i], 0, GFP_KERNEL); 2969f32764bdSDmitry Monakhov if (ret) 2970f32764bdSDmitry Monakhov panic("Cannot create dquot stat counters"); 2971f32764bdSDmitry Monakhov } 2972dde95888SDmitry Monakhov 2973884d179dSJan Kara /* Find power-of-two hlist_heads which can fit into allocation */ 2974884d179dSJan Kara nr_hash = (1UL << order) * PAGE_SIZE / sizeof(struct hlist_head); 2975884d179dSJan Kara dq_hash_bits = 0; 2976884d179dSJan Kara do { 2977884d179dSJan Kara dq_hash_bits++; 2978884d179dSJan Kara } while (nr_hash >> dq_hash_bits); 2979884d179dSJan Kara dq_hash_bits--; 2980884d179dSJan Kara 2981884d179dSJan Kara nr_hash = 1UL << dq_hash_bits; 2982884d179dSJan Kara dq_hash_mask = nr_hash - 1; 2983884d179dSJan Kara for (i = 0; i < nr_hash; i++) 2984884d179dSJan Kara INIT_HLIST_HEAD(dquot_hash + i); 2985884d179dSJan Kara 298619858e7bSAnton Blanchard pr_info("VFS: Dquot-cache hash table entries: %ld (order %ld," 298719858e7bSAnton Blanchard " %ld bytes)\n", nr_hash, order, (PAGE_SIZE << order)); 2988884d179dSJan Kara 298988bc0edeSTetsuo Handa if (register_shrinker(&dqcache_shrinker)) 299088bc0edeSTetsuo Handa panic("Cannot register dquot shrinker"); 2991884d179dSJan Kara 2992884d179dSJan Kara return 0; 2993884d179dSJan Kara } 2994331221faSPaul Gortmaker fs_initcall(dquot_init); 2995