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> 813f1266f1SChristoph Hellwig #include <linux/blkdev.h> 8255fa6091SDave Chinner #include "../internal.h" /* ugh */ 83884d179dSJan Kara 84f3da9310SJeff Liu #include <linux/uaccess.h> 85884d179dSJan Kara 86884d179dSJan Kara /* 877b9ca4c6SJan Kara * There are five quota SMP locks: 887b9ca4c6SJan Kara * * dq_list_lock protects all lists with quotas and quota formats. 897b9ca4c6SJan Kara * * dquot->dq_dqb_lock protects data from dq_dqb 907b9ca4c6SJan Kara * * inode->i_lock protects inode->i_blocks, i_bytes and also guards 917b9ca4c6SJan Kara * consistency of dquot->dq_dqb with inode->i_blocks, i_bytes so that 927b9ca4c6SJan Kara * dquot_transfer() can stabilize amount it transfers 937b9ca4c6SJan Kara * * dq_data_lock protects mem_dqinfo structures and modifications of dquot 947b9ca4c6SJan Kara * pointers in the inode 957b9ca4c6SJan Kara * * dq_state_lock protects modifications of quota state (on quotaon and 967b9ca4c6SJan Kara * quotaoff) and readers who care about latest values take it as well. 97884d179dSJan Kara * 987b9ca4c6SJan Kara * The spinlock ordering is hence: 997b9ca4c6SJan Kara * dq_data_lock > dq_list_lock > i_lock > dquot->dq_dqb_lock, 100884d179dSJan Kara * dq_list_lock > dq_state_lock 101884d179dSJan Kara * 102884d179dSJan Kara * Note that some things (eg. sb pointer, type, id) doesn't change during 103884d179dSJan Kara * the life of the dquot structure and so needn't to be protected by a lock 104884d179dSJan Kara * 105b9ba6f94SNiu Yawei * Operation accessing dquots via inode pointers are protected by dquot_srcu. 106b9ba6f94SNiu Yawei * Operation of reading pointer needs srcu_read_lock(&dquot_srcu), and 107b9ba6f94SNiu Yawei * synchronize_srcu(&dquot_srcu) is called after clearing pointers from 108b9ba6f94SNiu Yawei * inode and before dropping dquot references to avoid use of dquots after 109b9ba6f94SNiu Yawei * they are freed. dq_data_lock is used to serialize the pointer setting and 110b9ba6f94SNiu Yawei * clearing operations. 11126245c94SJan Kara * Special care needs to be taken about S_NOQUOTA inode flag (marking that 11226245c94SJan Kara * inode is a quota file). Functions adding pointers from inode to dquots have 113b9ba6f94SNiu Yawei * to check this flag under dq_data_lock and then (if S_NOQUOTA is not set) they 114b9ba6f94SNiu Yawei * have to do all pointer modifications before dropping dq_data_lock. This makes 11526245c94SJan Kara * sure they cannot race with quotaon which first sets S_NOQUOTA flag and 11626245c94SJan Kara * then drops all pointers to dquots from an inode. 117884d179dSJan Kara * 1185e8cb9b6SJan Kara * Each dquot has its dq_lock mutex. Dquot is locked when it is being read to 1195e8cb9b6SJan Kara * memory (or space for it is being allocated) on the first dqget(), when it is 1205e8cb9b6SJan Kara * being written out, and when it is being released on the last dqput(). The 1215e8cb9b6SJan Kara * allocation and release operations are serialized by the dq_lock and by 1225e8cb9b6SJan Kara * checking the use count in dquot_release(). 123884d179dSJan Kara * 124884d179dSJan Kara * Lock ordering (including related VFS locks) is the following: 125bc8230eeSJan Kara * s_umount > i_mutex > journal_lock > dquot->dq_lock > dqio_sem 126884d179dSJan Kara */ 127884d179dSJan Kara 128c516610cSJan Kara static __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_list_lock); 129c516610cSJan Kara static __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_state_lock); 130c516610cSJan Kara __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_data_lock); 131884d179dSJan Kara EXPORT_SYMBOL(dq_data_lock); 132b9ba6f94SNiu Yawei DEFINE_STATIC_SRCU(dquot_srcu); 133884d179dSJan Kara 134503330f3SJan Kara static DECLARE_WAIT_QUEUE_HEAD(dquot_ref_wq); 135503330f3SJan Kara 136fb5ffb0eSJiaying Zhang void __quota_error(struct super_block *sb, const char *func, 137fb5ffb0eSJiaying Zhang const char *fmt, ...) 138fb5ffb0eSJiaying Zhang { 139fb5ffb0eSJiaying Zhang if (printk_ratelimit()) { 140055adcbdSJoe Perches va_list args; 141055adcbdSJoe Perches struct va_format vaf; 142055adcbdSJoe Perches 143fb5ffb0eSJiaying Zhang va_start(args, fmt); 144055adcbdSJoe Perches 145055adcbdSJoe Perches vaf.fmt = fmt; 146055adcbdSJoe Perches vaf.va = &args; 147055adcbdSJoe Perches 148055adcbdSJoe Perches printk(KERN_ERR "Quota error (device %s): %s: %pV\n", 149055adcbdSJoe Perches sb->s_id, func, &vaf); 150055adcbdSJoe Perches 151fb5ffb0eSJiaying Zhang va_end(args); 152fb5ffb0eSJiaying Zhang } 153fb5ffb0eSJiaying Zhang } 154fb5ffb0eSJiaying Zhang EXPORT_SYMBOL(__quota_error); 155fb5ffb0eSJiaying Zhang 156da8d1ba2SSergey Senozhatsky #if defined(CONFIG_QUOTA_DEBUG) || defined(CONFIG_PRINT_QUOTA_WARNING) 157884d179dSJan Kara static char *quotatypes[] = INITQFNAMES; 158da8d1ba2SSergey Senozhatsky #endif 159884d179dSJan Kara static struct quota_format_type *quota_formats; /* List of registered formats */ 160884d179dSJan Kara static struct quota_module_name module_names[] = INIT_QUOTA_MODULE_NAMES; 161884d179dSJan Kara 162884d179dSJan Kara /* SLAB cache for dquot structures */ 163884d179dSJan Kara static struct kmem_cache *dquot_cachep; 164884d179dSJan Kara 165884d179dSJan Kara int register_quota_format(struct quota_format_type *fmt) 166884d179dSJan Kara { 167884d179dSJan Kara spin_lock(&dq_list_lock); 168884d179dSJan Kara fmt->qf_next = quota_formats; 169884d179dSJan Kara quota_formats = fmt; 170884d179dSJan Kara spin_unlock(&dq_list_lock); 171884d179dSJan Kara return 0; 172884d179dSJan Kara } 173884d179dSJan Kara EXPORT_SYMBOL(register_quota_format); 174884d179dSJan Kara 175884d179dSJan Kara void unregister_quota_format(struct quota_format_type *fmt) 176884d179dSJan Kara { 177884d179dSJan Kara struct quota_format_type **actqf; 178884d179dSJan Kara 179884d179dSJan Kara spin_lock(&dq_list_lock); 180268157baSJan Kara for (actqf = "a_formats; *actqf && *actqf != fmt; 181268157baSJan Kara actqf = &(*actqf)->qf_next) 182268157baSJan Kara ; 183884d179dSJan Kara if (*actqf) 184884d179dSJan Kara *actqf = (*actqf)->qf_next; 185884d179dSJan Kara spin_unlock(&dq_list_lock); 186884d179dSJan Kara } 187884d179dSJan Kara EXPORT_SYMBOL(unregister_quota_format); 188884d179dSJan Kara 189884d179dSJan Kara static struct quota_format_type *find_quota_format(int id) 190884d179dSJan Kara { 191884d179dSJan Kara struct quota_format_type *actqf; 192884d179dSJan Kara 193884d179dSJan Kara spin_lock(&dq_list_lock); 194268157baSJan Kara for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id; 195268157baSJan Kara actqf = actqf->qf_next) 196268157baSJan Kara ; 197884d179dSJan Kara if (!actqf || !try_module_get(actqf->qf_owner)) { 198884d179dSJan Kara int qm; 199884d179dSJan Kara 200884d179dSJan Kara spin_unlock(&dq_list_lock); 201884d179dSJan Kara 202268157baSJan Kara for (qm = 0; module_names[qm].qm_fmt_id && 203268157baSJan Kara module_names[qm].qm_fmt_id != id; qm++) 204268157baSJan Kara ; 205268157baSJan Kara if (!module_names[qm].qm_fmt_id || 206268157baSJan Kara request_module(module_names[qm].qm_mod_name)) 207884d179dSJan Kara return NULL; 208884d179dSJan Kara 209884d179dSJan Kara spin_lock(&dq_list_lock); 210268157baSJan Kara for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id; 211268157baSJan Kara actqf = actqf->qf_next) 212268157baSJan Kara ; 213884d179dSJan Kara if (actqf && !try_module_get(actqf->qf_owner)) 214884d179dSJan Kara actqf = NULL; 215884d179dSJan Kara } 216884d179dSJan Kara spin_unlock(&dq_list_lock); 217884d179dSJan Kara return actqf; 218884d179dSJan Kara } 219884d179dSJan Kara 220884d179dSJan Kara static void put_quota_format(struct quota_format_type *fmt) 221884d179dSJan Kara { 222884d179dSJan Kara module_put(fmt->qf_owner); 223884d179dSJan Kara } 224884d179dSJan Kara 225884d179dSJan Kara /* 226884d179dSJan Kara * Dquot List Management: 227f44840adSChengguang Xu * The quota code uses four lists for dquot management: the inuse_list, 228f44840adSChengguang Xu * free_dquots, dqi_dirty_list, and dquot_hash[] array. A single dquot 229f44840adSChengguang Xu * structure may be on some of those lists, depending on its current state. 230884d179dSJan Kara * 231884d179dSJan Kara * All dquots are placed to the end of inuse_list when first created, and this 232884d179dSJan Kara * list is used for invalidate operation, which must look at every dquot. 233884d179dSJan Kara * 234884d179dSJan Kara * Unused dquots (dq_count == 0) are added to the free_dquots list when freed, 235884d179dSJan Kara * and this list is searched whenever we need an available dquot. Dquots are 236884d179dSJan Kara * removed from the list as soon as they are used again, and 237884d179dSJan Kara * dqstats.free_dquots gives the number of dquots on the list. When 238884d179dSJan Kara * dquot is invalidated it's completely released from memory. 239884d179dSJan Kara * 240f44840adSChengguang Xu * Dirty dquots are added to the dqi_dirty_list of quota_info when mark 241f44840adSChengguang Xu * dirtied, and this list is searched when writing dirty dquots back to 242f44840adSChengguang Xu * quota file. Note that some filesystems do dirty dquot tracking on their 243f44840adSChengguang Xu * own (e.g. in a journal) and thus don't use dqi_dirty_list. 244f44840adSChengguang Xu * 245884d179dSJan Kara * Dquots with a specific identity (device, type and id) are placed on 246884d179dSJan Kara * one of the dquot_hash[] hash chains. The provides an efficient search 247884d179dSJan Kara * mechanism to locate a specific dquot. 248884d179dSJan Kara */ 249884d179dSJan Kara 250884d179dSJan Kara static LIST_HEAD(inuse_list); 251884d179dSJan Kara static LIST_HEAD(free_dquots); 252884d179dSJan Kara static unsigned int dq_hash_bits, dq_hash_mask; 253884d179dSJan Kara static struct hlist_head *dquot_hash; 254884d179dSJan Kara 255884d179dSJan Kara struct dqstats dqstats; 256884d179dSJan Kara EXPORT_SYMBOL(dqstats); 257884d179dSJan Kara 2580a5a9c72SJan Kara static qsize_t inode_get_rsv_space(struct inode *inode); 2597b9ca4c6SJan Kara static qsize_t __inode_get_rsv_space(struct inode *inode); 2606184fc0bSJan Kara static int __dquot_initialize(struct inode *inode, int type); 2610a5a9c72SJan Kara 262884d179dSJan Kara static inline unsigned int 2631a06d420SEric W. Biederman hashfn(const struct super_block *sb, struct kqid qid) 264884d179dSJan Kara { 2651a06d420SEric W. Biederman unsigned int id = from_kqid(&init_user_ns, qid); 2661a06d420SEric W. Biederman int type = qid.type; 267884d179dSJan Kara unsigned long tmp; 268884d179dSJan Kara 269884d179dSJan Kara tmp = (((unsigned long)sb>>L1_CACHE_SHIFT) ^ id) * (MAXQUOTAS - type); 270884d179dSJan Kara return (tmp + (tmp >> dq_hash_bits)) & dq_hash_mask; 271884d179dSJan Kara } 272884d179dSJan Kara 273884d179dSJan Kara /* 274884d179dSJan Kara * Following list functions expect dq_list_lock to be held 275884d179dSJan Kara */ 276884d179dSJan Kara static inline void insert_dquot_hash(struct dquot *dquot) 277884d179dSJan Kara { 278268157baSJan Kara struct hlist_head *head; 2791a06d420SEric W. Biederman head = dquot_hash + hashfn(dquot->dq_sb, dquot->dq_id); 280884d179dSJan Kara hlist_add_head(&dquot->dq_hash, head); 281884d179dSJan Kara } 282884d179dSJan Kara 283884d179dSJan Kara static inline void remove_dquot_hash(struct dquot *dquot) 284884d179dSJan Kara { 285884d179dSJan Kara hlist_del_init(&dquot->dq_hash); 286884d179dSJan Kara } 287884d179dSJan Kara 2887a2435d8SJan Kara static struct dquot *find_dquot(unsigned int hashent, struct super_block *sb, 2891a06d420SEric W. Biederman struct kqid qid) 290884d179dSJan Kara { 291884d179dSJan Kara struct dquot *dquot; 292884d179dSJan Kara 2938c721cb0SChristophe JAILLET hlist_for_each_entry(dquot, dquot_hash+hashent, dq_hash) 2944c376dcaSEric W. Biederman if (dquot->dq_sb == sb && qid_eq(dquot->dq_id, qid)) 295884d179dSJan Kara return dquot; 2968c721cb0SChristophe JAILLET 297dd6f3c6dSJan Kara return NULL; 298884d179dSJan Kara } 299884d179dSJan Kara 300884d179dSJan Kara /* Add a dquot to the tail of the free list */ 301884d179dSJan Kara static inline void put_dquot_last(struct dquot *dquot) 302884d179dSJan Kara { 303884d179dSJan Kara list_add_tail(&dquot->dq_free, &free_dquots); 304dde95888SDmitry Monakhov dqstats_inc(DQST_FREE_DQUOTS); 305884d179dSJan Kara } 306884d179dSJan Kara 307884d179dSJan Kara static inline void remove_free_dquot(struct dquot *dquot) 308884d179dSJan Kara { 309884d179dSJan Kara if (list_empty(&dquot->dq_free)) 310884d179dSJan Kara return; 311884d179dSJan Kara list_del_init(&dquot->dq_free); 312dde95888SDmitry Monakhov dqstats_dec(DQST_FREE_DQUOTS); 313884d179dSJan Kara } 314884d179dSJan Kara 315884d179dSJan Kara static inline void put_inuse(struct dquot *dquot) 316884d179dSJan Kara { 317884d179dSJan Kara /* We add to the back of inuse list so we don't have to restart 318884d179dSJan Kara * when traversing this list and we block */ 319884d179dSJan Kara list_add_tail(&dquot->dq_inuse, &inuse_list); 320dde95888SDmitry Monakhov dqstats_inc(DQST_ALLOC_DQUOTS); 321884d179dSJan Kara } 322884d179dSJan Kara 323884d179dSJan Kara static inline void remove_inuse(struct dquot *dquot) 324884d179dSJan Kara { 325dde95888SDmitry Monakhov dqstats_dec(DQST_ALLOC_DQUOTS); 326884d179dSJan Kara list_del(&dquot->dq_inuse); 327884d179dSJan Kara } 328884d179dSJan Kara /* 329884d179dSJan Kara * End of list functions needing dq_list_lock 330884d179dSJan Kara */ 331884d179dSJan Kara 332884d179dSJan Kara static void wait_on_dquot(struct dquot *dquot) 333884d179dSJan Kara { 334884d179dSJan Kara mutex_lock(&dquot->dq_lock); 335884d179dSJan Kara mutex_unlock(&dquot->dq_lock); 336884d179dSJan Kara } 337884d179dSJan Kara 338884d179dSJan Kara static inline int dquot_dirty(struct dquot *dquot) 339884d179dSJan Kara { 340884d179dSJan Kara return test_bit(DQ_MOD_B, &dquot->dq_flags); 341884d179dSJan Kara } 342884d179dSJan Kara 343884d179dSJan Kara static inline int mark_dquot_dirty(struct dquot *dquot) 344884d179dSJan Kara { 345884d179dSJan Kara return dquot->dq_sb->dq_op->mark_dirty(dquot); 346884d179dSJan Kara } 347884d179dSJan Kara 348eabf290dSDmitry Monakhov /* Mark dquot dirty in atomic manner, and return it's old dirty flag state */ 349884d179dSJan Kara int dquot_mark_dquot_dirty(struct dquot *dquot) 350884d179dSJan Kara { 351eabf290dSDmitry Monakhov int ret = 1; 352eabf290dSDmitry Monakhov 3534580b30eSJan Kara if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) 3544580b30eSJan Kara return 0; 3554580b30eSJan Kara 356834057bfSJan Kara if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NOLIST_DIRTY) 357834057bfSJan Kara return test_and_set_bit(DQ_MOD_B, &dquot->dq_flags); 358834057bfSJan Kara 359eabf290dSDmitry Monakhov /* If quota is dirty already, we don't have to acquire dq_list_lock */ 360eabf290dSDmitry Monakhov if (test_bit(DQ_MOD_B, &dquot->dq_flags)) 361eabf290dSDmitry Monakhov return 1; 362eabf290dSDmitry Monakhov 363884d179dSJan Kara spin_lock(&dq_list_lock); 364eabf290dSDmitry Monakhov if (!test_and_set_bit(DQ_MOD_B, &dquot->dq_flags)) { 365884d179dSJan Kara list_add(&dquot->dq_dirty, &sb_dqopt(dquot->dq_sb)-> 3664c376dcaSEric W. Biederman info[dquot->dq_id.type].dqi_dirty_list); 367eabf290dSDmitry Monakhov ret = 0; 368eabf290dSDmitry Monakhov } 369884d179dSJan Kara spin_unlock(&dq_list_lock); 370eabf290dSDmitry Monakhov return ret; 371884d179dSJan Kara } 372884d179dSJan Kara EXPORT_SYMBOL(dquot_mark_dquot_dirty); 373884d179dSJan Kara 374dc52dd3aSDmitry Monakhov /* Dirtify all the dquots - this can block when journalling */ 375dc52dd3aSDmitry Monakhov static inline int mark_all_dquot_dirty(struct dquot * const *dquot) 376dc52dd3aSDmitry Monakhov { 377dc52dd3aSDmitry Monakhov int ret, err, cnt; 378dc52dd3aSDmitry Monakhov 379dc52dd3aSDmitry Monakhov ret = err = 0; 380dc52dd3aSDmitry Monakhov for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 381dc52dd3aSDmitry Monakhov if (dquot[cnt]) 382dc52dd3aSDmitry Monakhov /* Even in case of error we have to continue */ 383dc52dd3aSDmitry Monakhov ret = mark_dquot_dirty(dquot[cnt]); 384dc52dd3aSDmitry Monakhov if (!err) 385dc52dd3aSDmitry Monakhov err = ret; 386dc52dd3aSDmitry Monakhov } 387dc52dd3aSDmitry Monakhov return err; 388dc52dd3aSDmitry Monakhov } 389dc52dd3aSDmitry Monakhov 390dc52dd3aSDmitry Monakhov static inline void dqput_all(struct dquot **dquot) 391dc52dd3aSDmitry Monakhov { 392dc52dd3aSDmitry Monakhov unsigned int cnt; 393dc52dd3aSDmitry Monakhov 394dc52dd3aSDmitry Monakhov for (cnt = 0; cnt < MAXQUOTAS; cnt++) 395dc52dd3aSDmitry Monakhov dqput(dquot[cnt]); 396dc52dd3aSDmitry Monakhov } 397dc52dd3aSDmitry Monakhov 398884d179dSJan Kara static inline int clear_dquot_dirty(struct dquot *dquot) 399884d179dSJan Kara { 400834057bfSJan Kara if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NOLIST_DIRTY) 401834057bfSJan Kara return test_and_clear_bit(DQ_MOD_B, &dquot->dq_flags); 402834057bfSJan Kara 4031e0b7cb0SJan Kara spin_lock(&dq_list_lock); 4041e0b7cb0SJan Kara if (!test_and_clear_bit(DQ_MOD_B, &dquot->dq_flags)) { 4051e0b7cb0SJan Kara spin_unlock(&dq_list_lock); 406884d179dSJan Kara return 0; 4071e0b7cb0SJan Kara } 408884d179dSJan Kara list_del_init(&dquot->dq_dirty); 4091e0b7cb0SJan Kara spin_unlock(&dq_list_lock); 410884d179dSJan Kara return 1; 411884d179dSJan Kara } 412884d179dSJan Kara 413884d179dSJan Kara void mark_info_dirty(struct super_block *sb, int type) 414884d179dSJan Kara { 41515512377SJan Kara spin_lock(&dq_data_lock); 41615512377SJan Kara sb_dqopt(sb)->info[type].dqi_flags |= DQF_INFO_DIRTY; 41715512377SJan Kara spin_unlock(&dq_data_lock); 418884d179dSJan Kara } 419884d179dSJan Kara EXPORT_SYMBOL(mark_info_dirty); 420884d179dSJan Kara 421884d179dSJan Kara /* 422884d179dSJan Kara * Read dquot from disk and alloc space for it 423884d179dSJan Kara */ 424884d179dSJan Kara 425884d179dSJan Kara int dquot_acquire(struct dquot *dquot) 426884d179dSJan Kara { 427884d179dSJan Kara int ret = 0, ret2 = 0; 428884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); 429884d179dSJan Kara 430884d179dSJan Kara mutex_lock(&dquot->dq_lock); 4313ef177ecSChengguang Xu if (!test_bit(DQ_READ_B, &dquot->dq_flags)) { 4324c376dcaSEric W. Biederman ret = dqopt->ops[dquot->dq_id.type]->read_dqblk(dquot); 433884d179dSJan Kara if (ret < 0) 434884d179dSJan Kara goto out_iolock; 4353ef177ecSChengguang Xu } 436044c9b67SJan Kara /* Make sure flags update is visible after dquot has been filled */ 437044c9b67SJan Kara smp_mb__before_atomic(); 438884d179dSJan Kara set_bit(DQ_READ_B, &dquot->dq_flags); 439884d179dSJan Kara /* Instantiate dquot if needed */ 440884d179dSJan Kara if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && !dquot->dq_off) { 4414c376dcaSEric W. Biederman ret = dqopt->ops[dquot->dq_id.type]->commit_dqblk(dquot); 442884d179dSJan Kara /* Write the info if needed */ 4434c376dcaSEric W. Biederman if (info_dirty(&dqopt->info[dquot->dq_id.type])) { 4444c376dcaSEric W. Biederman ret2 = dqopt->ops[dquot->dq_id.type]->write_file_info( 4454c376dcaSEric W. Biederman dquot->dq_sb, dquot->dq_id.type); 446268157baSJan Kara } 447884d179dSJan Kara if (ret < 0) 448884d179dSJan Kara goto out_iolock; 449884d179dSJan Kara if (ret2 < 0) { 450884d179dSJan Kara ret = ret2; 451884d179dSJan Kara goto out_iolock; 452884d179dSJan Kara } 453884d179dSJan Kara } 454044c9b67SJan Kara /* 455044c9b67SJan Kara * Make sure flags update is visible after on-disk struct has been 456044c9b67SJan Kara * allocated. Paired with smp_rmb() in dqget(). 457044c9b67SJan Kara */ 458044c9b67SJan Kara smp_mb__before_atomic(); 459884d179dSJan Kara set_bit(DQ_ACTIVE_B, &dquot->dq_flags); 460884d179dSJan Kara out_iolock: 461884d179dSJan Kara mutex_unlock(&dquot->dq_lock); 462884d179dSJan Kara return ret; 463884d179dSJan Kara } 464884d179dSJan Kara EXPORT_SYMBOL(dquot_acquire); 465884d179dSJan Kara 466884d179dSJan Kara /* 467884d179dSJan Kara * Write dquot to disk 468884d179dSJan Kara */ 469884d179dSJan Kara int dquot_commit(struct dquot *dquot) 470884d179dSJan Kara { 471b03f2456SJan Kara int ret = 0; 472884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); 473884d179dSJan Kara 4745e8cb9b6SJan Kara mutex_lock(&dquot->dq_lock); 4751e0b7cb0SJan Kara if (!clear_dquot_dirty(dquot)) 4765e8cb9b6SJan Kara goto out_lock; 477884d179dSJan Kara /* Inactive dquot can be only if there was error during read/init 478884d179dSJan Kara * => we have better not writing it */ 479b03f2456SJan Kara if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) 4804c376dcaSEric W. Biederman ret = dqopt->ops[dquot->dq_id.type]->commit_dqblk(dquot); 481b03f2456SJan Kara else 482b03f2456SJan Kara ret = -EIO; 4835e8cb9b6SJan Kara out_lock: 4845e8cb9b6SJan Kara mutex_unlock(&dquot->dq_lock); 485884d179dSJan Kara return ret; 486884d179dSJan Kara } 487884d179dSJan Kara EXPORT_SYMBOL(dquot_commit); 488884d179dSJan Kara 489884d179dSJan Kara /* 490884d179dSJan Kara * Release dquot 491884d179dSJan Kara */ 492884d179dSJan Kara int dquot_release(struct dquot *dquot) 493884d179dSJan Kara { 494884d179dSJan Kara int ret = 0, ret2 = 0; 495884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); 496884d179dSJan Kara 497884d179dSJan Kara mutex_lock(&dquot->dq_lock); 498884d179dSJan Kara /* Check whether we are not racing with some other dqget() */ 499df4bb5d1SDmitry Monakhov if (dquot_is_busy(dquot)) 500884d179dSJan Kara goto out_dqlock; 5014c376dcaSEric W. Biederman if (dqopt->ops[dquot->dq_id.type]->release_dqblk) { 5024c376dcaSEric W. Biederman ret = dqopt->ops[dquot->dq_id.type]->release_dqblk(dquot); 503884d179dSJan Kara /* Write the info */ 5044c376dcaSEric W. Biederman if (info_dirty(&dqopt->info[dquot->dq_id.type])) { 5054c376dcaSEric W. Biederman ret2 = dqopt->ops[dquot->dq_id.type]->write_file_info( 5064c376dcaSEric W. Biederman dquot->dq_sb, dquot->dq_id.type); 507268157baSJan Kara } 508884d179dSJan Kara if (ret >= 0) 509884d179dSJan Kara ret = ret2; 510884d179dSJan Kara } 511884d179dSJan Kara clear_bit(DQ_ACTIVE_B, &dquot->dq_flags); 512884d179dSJan Kara out_dqlock: 513884d179dSJan Kara mutex_unlock(&dquot->dq_lock); 514884d179dSJan Kara return ret; 515884d179dSJan Kara } 516884d179dSJan Kara EXPORT_SYMBOL(dquot_release); 517884d179dSJan Kara 518884d179dSJan Kara void dquot_destroy(struct dquot *dquot) 519884d179dSJan Kara { 520884d179dSJan Kara kmem_cache_free(dquot_cachep, dquot); 521884d179dSJan Kara } 522884d179dSJan Kara EXPORT_SYMBOL(dquot_destroy); 523884d179dSJan Kara 524884d179dSJan Kara static inline void do_destroy_dquot(struct dquot *dquot) 525884d179dSJan Kara { 526884d179dSJan Kara dquot->dq_sb->dq_op->destroy_dquot(dquot); 527884d179dSJan Kara } 528884d179dSJan Kara 529884d179dSJan Kara /* Invalidate all dquots on the list. Note that this function is called after 530884d179dSJan Kara * quota is disabled and pointers from inodes removed so there cannot be new 531884d179dSJan Kara * quota users. There can still be some users of quotas due to inodes being 532884d179dSJan Kara * just deleted or pruned by prune_icache() (those are not attached to any 533884d179dSJan Kara * list) or parallel quotactl call. We have to wait for such users. 534884d179dSJan Kara */ 535884d179dSJan Kara static void invalidate_dquots(struct super_block *sb, int type) 536884d179dSJan Kara { 537884d179dSJan Kara struct dquot *dquot, *tmp; 538884d179dSJan Kara 539884d179dSJan Kara restart: 540884d179dSJan Kara spin_lock(&dq_list_lock); 541884d179dSJan Kara list_for_each_entry_safe(dquot, tmp, &inuse_list, dq_inuse) { 542884d179dSJan Kara if (dquot->dq_sb != sb) 543884d179dSJan Kara continue; 5444c376dcaSEric W. Biederman if (dquot->dq_id.type != type) 545884d179dSJan Kara continue; 546884d179dSJan Kara /* Wait for dquot users */ 547884d179dSJan Kara if (atomic_read(&dquot->dq_count)) { 5489f985cb6SJan Kara dqgrab(dquot); 549884d179dSJan Kara spin_unlock(&dq_list_lock); 550503330f3SJan Kara /* 551503330f3SJan Kara * Once dqput() wakes us up, we know it's time to free 552884d179dSJan Kara * the dquot. 553884d179dSJan Kara * IMPORTANT: we rely on the fact that there is always 554884d179dSJan Kara * at most one process waiting for dquot to free. 555884d179dSJan Kara * Otherwise dq_count would be > 1 and we would never 556884d179dSJan Kara * wake up. 557884d179dSJan Kara */ 558503330f3SJan Kara wait_event(dquot_ref_wq, 559503330f3SJan Kara atomic_read(&dquot->dq_count) == 1); 560884d179dSJan Kara dqput(dquot); 561884d179dSJan Kara /* At this moment dquot() need not exist (it could be 562884d179dSJan Kara * reclaimed by prune_dqcache(). Hence we must 563884d179dSJan Kara * restart. */ 564884d179dSJan Kara goto restart; 565884d179dSJan Kara } 566884d179dSJan Kara /* 567884d179dSJan Kara * Quota now has no users and it has been written on last 568884d179dSJan Kara * dqput() 569884d179dSJan Kara */ 570884d179dSJan Kara remove_dquot_hash(dquot); 571884d179dSJan Kara remove_free_dquot(dquot); 572884d179dSJan Kara remove_inuse(dquot); 573884d179dSJan Kara do_destroy_dquot(dquot); 574884d179dSJan Kara } 575884d179dSJan Kara spin_unlock(&dq_list_lock); 576884d179dSJan Kara } 577884d179dSJan Kara 578884d179dSJan Kara /* Call callback for every active dquot on given filesystem */ 579884d179dSJan Kara int dquot_scan_active(struct super_block *sb, 580884d179dSJan Kara int (*fn)(struct dquot *dquot, unsigned long priv), 581884d179dSJan Kara unsigned long priv) 582884d179dSJan Kara { 583884d179dSJan Kara struct dquot *dquot, *old_dquot = NULL; 584884d179dSJan Kara int ret = 0; 585884d179dSJan Kara 586ee1ac541SJan Kara WARN_ON_ONCE(!rwsem_is_locked(&sb->s_umount)); 587ee1ac541SJan Kara 588884d179dSJan Kara spin_lock(&dq_list_lock); 589884d179dSJan Kara list_for_each_entry(dquot, &inuse_list, dq_inuse) { 590884d179dSJan Kara if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) 591884d179dSJan Kara continue; 592884d179dSJan Kara if (dquot->dq_sb != sb) 593884d179dSJan Kara continue; 594884d179dSJan Kara /* Now we have active dquot so we can just increase use count */ 595884d179dSJan Kara atomic_inc(&dquot->dq_count); 596884d179dSJan Kara spin_unlock(&dq_list_lock); 597884d179dSJan Kara dqput(old_dquot); 598884d179dSJan Kara old_dquot = dquot; 5991362f4eaSJan Kara /* 6001362f4eaSJan Kara * ->release_dquot() can be racing with us. Our reference 6011362f4eaSJan Kara * protects us from new calls to it so just wait for any 6021362f4eaSJan Kara * outstanding call and recheck the DQ_ACTIVE_B after that. 6031362f4eaSJan Kara */ 6041362f4eaSJan Kara wait_on_dquot(dquot); 6051362f4eaSJan Kara if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { 606884d179dSJan Kara ret = fn(dquot, priv); 607884d179dSJan Kara if (ret < 0) 608884d179dSJan Kara goto out; 6091362f4eaSJan Kara } 610884d179dSJan Kara spin_lock(&dq_list_lock); 611884d179dSJan Kara /* We are safe to continue now because our dquot could not 612884d179dSJan Kara * be moved out of the inuse list while we hold the reference */ 613884d179dSJan Kara } 614884d179dSJan Kara spin_unlock(&dq_list_lock); 615884d179dSJan Kara out: 616884d179dSJan Kara dqput(old_dquot); 617884d179dSJan Kara return ret; 618884d179dSJan Kara } 619884d179dSJan Kara EXPORT_SYMBOL(dquot_scan_active); 620884d179dSJan Kara 621ceed1723SJan Kara /* Write all dquot structures to quota files */ 622ceed1723SJan Kara int dquot_writeback_dquots(struct super_block *sb, int type) 623884d179dSJan Kara { 6246ff33d99SDmitry Monakhov struct list_head dirty; 625884d179dSJan Kara struct dquot *dquot; 626884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 627884d179dSJan Kara int cnt; 628ceed1723SJan Kara int err, ret = 0; 629884d179dSJan Kara 6309d1ccbe7SJan Kara WARN_ON_ONCE(!rwsem_is_locked(&sb->s_umount)); 6319d1ccbe7SJan Kara 632884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 633884d179dSJan Kara if (type != -1 && cnt != type) 634884d179dSJan Kara continue; 635884d179dSJan Kara if (!sb_has_quota_active(sb, cnt)) 636884d179dSJan Kara continue; 637884d179dSJan Kara spin_lock(&dq_list_lock); 6386ff33d99SDmitry Monakhov /* Move list away to avoid livelock. */ 6396ff33d99SDmitry Monakhov list_replace_init(&dqopt->info[cnt].dqi_dirty_list, &dirty); 6406ff33d99SDmitry Monakhov while (!list_empty(&dirty)) { 6416ff33d99SDmitry Monakhov dquot = list_first_entry(&dirty, struct dquot, 642268157baSJan Kara dq_dirty); 6434580b30eSJan Kara 6444580b30eSJan Kara WARN_ON(!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)); 6454580b30eSJan Kara 646884d179dSJan Kara /* Now we have active dquot from which someone is 647884d179dSJan Kara * holding reference so we can safely just increase 648884d179dSJan Kara * use count */ 6499f985cb6SJan Kara dqgrab(dquot); 650884d179dSJan Kara spin_unlock(&dq_list_lock); 651ceed1723SJan Kara err = sb->dq_op->write_dquot(dquot); 652dd5f6279Szhangyi (F) if (err) { 653dd5f6279Szhangyi (F) /* 654dd5f6279Szhangyi (F) * Clear dirty bit anyway to avoid infinite 655dd5f6279Szhangyi (F) * loop here. 656dd5f6279Szhangyi (F) */ 657dd5f6279Szhangyi (F) clear_dquot_dirty(dquot); 658dd5f6279Szhangyi (F) if (!ret) 659474d2605SJan Kara ret = err; 660dd5f6279Szhangyi (F) } 661884d179dSJan Kara dqput(dquot); 662884d179dSJan Kara spin_lock(&dq_list_lock); 663884d179dSJan Kara } 664884d179dSJan Kara spin_unlock(&dq_list_lock); 665884d179dSJan Kara } 666884d179dSJan Kara 667884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 668884d179dSJan Kara if ((cnt == type || type == -1) && sb_has_quota_active(sb, cnt) 669884d179dSJan Kara && info_dirty(&dqopt->info[cnt])) 670884d179dSJan Kara sb->dq_op->write_info(sb, cnt); 671dde95888SDmitry Monakhov dqstats_inc(DQST_SYNCS); 672884d179dSJan Kara 673ceed1723SJan Kara return ret; 674ceed1723SJan Kara } 675ceed1723SJan Kara EXPORT_SYMBOL(dquot_writeback_dquots); 676ceed1723SJan Kara 677ceed1723SJan Kara /* Write all dquot structures to disk and make them visible from userspace */ 678ceed1723SJan Kara int dquot_quota_sync(struct super_block *sb, int type) 679ceed1723SJan Kara { 680ceed1723SJan Kara struct quota_info *dqopt = sb_dqopt(sb); 681ceed1723SJan Kara int cnt; 682ceed1723SJan Kara int ret; 683ceed1723SJan Kara 684ceed1723SJan Kara ret = dquot_writeback_dquots(sb, type); 685ceed1723SJan Kara if (ret) 686ceed1723SJan Kara return ret; 687ceed1723SJan Kara if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) 6885fb324adSChristoph Hellwig return 0; 6895fb324adSChristoph Hellwig 6905fb324adSChristoph Hellwig /* This is not very clever (and fast) but currently I don't know about 6915fb324adSChristoph Hellwig * any other simple way of getting quota data to disk and we must get 6925fb324adSChristoph Hellwig * them there for userspace to be visible... */ 693*dd5532a4SDarrick J. Wong if (sb->s_op->sync_fs) { 694*dd5532a4SDarrick J. Wong ret = sb->s_op->sync_fs(sb, 1); 695*dd5532a4SDarrick J. Wong if (ret) 696*dd5532a4SDarrick J. Wong return ret; 697*dd5532a4SDarrick J. Wong } 698*dd5532a4SDarrick J. Wong ret = sync_blockdev(sb->s_bdev); 699*dd5532a4SDarrick J. Wong if (ret) 700*dd5532a4SDarrick J. Wong return ret; 7015fb324adSChristoph Hellwig 7025fb324adSChristoph Hellwig /* 7035fb324adSChristoph Hellwig * Now when everything is written we can discard the pagecache so 7045fb324adSChristoph Hellwig * that userspace sees the changes. 7055fb324adSChristoph Hellwig */ 7065fb324adSChristoph Hellwig for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 7075fb324adSChristoph Hellwig if (type != -1 && cnt != type) 7085fb324adSChristoph Hellwig continue; 7095fb324adSChristoph Hellwig if (!sb_has_quota_active(sb, cnt)) 7105fb324adSChristoph Hellwig continue; 7115955102cSAl Viro inode_lock(dqopt->files[cnt]); 712f9ef1784SJan Kara truncate_inode_pages(&dqopt->files[cnt]->i_data, 0); 7135955102cSAl Viro inode_unlock(dqopt->files[cnt]); 7145fb324adSChristoph Hellwig } 7155fb324adSChristoph Hellwig 716884d179dSJan Kara return 0; 717884d179dSJan Kara } 718287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_quota_sync); 719884d179dSJan Kara 7201ab6c499SDave Chinner static unsigned long 7211ab6c499SDave Chinner dqcache_shrink_scan(struct shrinker *shrink, struct shrink_control *sc) 722884d179dSJan Kara { 723884d179dSJan Kara struct dquot *dquot; 7241ab6c499SDave Chinner unsigned long freed = 0; 725884d179dSJan Kara 726d68aab6bSNiu Yawei spin_lock(&dq_list_lock); 7271822193bSJan Kara while (!list_empty(&free_dquots) && sc->nr_to_scan) { 7281822193bSJan Kara dquot = list_first_entry(&free_dquots, struct dquot, dq_free); 729884d179dSJan Kara remove_dquot_hash(dquot); 730884d179dSJan Kara remove_free_dquot(dquot); 731884d179dSJan Kara remove_inuse(dquot); 732884d179dSJan Kara do_destroy_dquot(dquot); 7331ab6c499SDave Chinner sc->nr_to_scan--; 7341ab6c499SDave Chinner freed++; 735884d179dSJan Kara } 736d68aab6bSNiu Yawei spin_unlock(&dq_list_lock); 7371ab6c499SDave Chinner return freed; 738884d179dSJan Kara } 739884d179dSJan Kara 7401ab6c499SDave Chinner static unsigned long 7411ab6c499SDave Chinner dqcache_shrink_count(struct shrinker *shrink, struct shrink_control *sc) 742884d179dSJan Kara { 74355f841ceSGlauber Costa return vfs_pressure_ratio( 74455f841ceSGlauber Costa percpu_counter_read_positive(&dqstats.counter[DQST_FREE_DQUOTS])); 745884d179dSJan Kara } 746884d179dSJan Kara 747884d179dSJan Kara static struct shrinker dqcache_shrinker = { 7481ab6c499SDave Chinner .count_objects = dqcache_shrink_count, 7491ab6c499SDave Chinner .scan_objects = dqcache_shrink_scan, 750884d179dSJan Kara .seeks = DEFAULT_SEEKS, 751884d179dSJan Kara }; 752884d179dSJan Kara 753884d179dSJan Kara /* 754884d179dSJan Kara * Put reference to dquot 755884d179dSJan Kara */ 756884d179dSJan Kara void dqput(struct dquot *dquot) 757884d179dSJan Kara { 758884d179dSJan Kara int ret; 759884d179dSJan Kara 760884d179dSJan Kara if (!dquot) 761884d179dSJan Kara return; 76262af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 763884d179dSJan Kara if (!atomic_read(&dquot->dq_count)) { 764fb5ffb0eSJiaying Zhang quota_error(dquot->dq_sb, "trying to free free dquot of %s %d", 7654c376dcaSEric W. Biederman quotatypes[dquot->dq_id.type], 7664c376dcaSEric W. Biederman from_kqid(&init_user_ns, dquot->dq_id)); 767884d179dSJan Kara BUG(); 768884d179dSJan Kara } 769884d179dSJan Kara #endif 770dde95888SDmitry Monakhov dqstats_inc(DQST_DROPS); 771884d179dSJan Kara we_slept: 772884d179dSJan Kara spin_lock(&dq_list_lock); 773884d179dSJan Kara if (atomic_read(&dquot->dq_count) > 1) { 774884d179dSJan Kara /* We have more than one user... nothing to do */ 775884d179dSJan Kara atomic_dec(&dquot->dq_count); 776884d179dSJan Kara /* Releasing dquot during quotaoff phase? */ 7774c376dcaSEric W. Biederman if (!sb_has_quota_active(dquot->dq_sb, dquot->dq_id.type) && 778884d179dSJan Kara atomic_read(&dquot->dq_count) == 1) 779503330f3SJan Kara wake_up(&dquot_ref_wq); 780884d179dSJan Kara spin_unlock(&dq_list_lock); 781884d179dSJan Kara return; 782884d179dSJan Kara } 783884d179dSJan Kara /* Need to release dquot? */ 7844580b30eSJan Kara if (dquot_dirty(dquot)) { 785884d179dSJan Kara spin_unlock(&dq_list_lock); 786884d179dSJan Kara /* Commit dquot before releasing */ 787884d179dSJan Kara ret = dquot->dq_sb->dq_op->write_dquot(dquot); 788884d179dSJan Kara if (ret < 0) { 789fb5ffb0eSJiaying Zhang quota_error(dquot->dq_sb, "Can't write quota structure" 790fb5ffb0eSJiaying Zhang " (error %d). Quota may get out of sync!", 791fb5ffb0eSJiaying Zhang ret); 792884d179dSJan Kara /* 793884d179dSJan Kara * We clear dirty bit anyway, so that we avoid 794884d179dSJan Kara * infinite loop here 795884d179dSJan Kara */ 796884d179dSJan Kara clear_dquot_dirty(dquot); 797884d179dSJan Kara } 798884d179dSJan Kara goto we_slept; 799884d179dSJan Kara } 800884d179dSJan Kara if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { 801884d179dSJan Kara spin_unlock(&dq_list_lock); 802884d179dSJan Kara dquot->dq_sb->dq_op->release_dquot(dquot); 803884d179dSJan Kara goto we_slept; 804884d179dSJan Kara } 805884d179dSJan Kara atomic_dec(&dquot->dq_count); 80662af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 807884d179dSJan Kara /* sanity check */ 808884d179dSJan Kara BUG_ON(!list_empty(&dquot->dq_free)); 809884d179dSJan Kara #endif 810884d179dSJan Kara put_dquot_last(dquot); 811884d179dSJan Kara spin_unlock(&dq_list_lock); 812884d179dSJan Kara } 813884d179dSJan Kara EXPORT_SYMBOL(dqput); 814884d179dSJan Kara 815884d179dSJan Kara struct dquot *dquot_alloc(struct super_block *sb, int type) 816884d179dSJan Kara { 817884d179dSJan Kara return kmem_cache_zalloc(dquot_cachep, GFP_NOFS); 818884d179dSJan Kara } 819884d179dSJan Kara EXPORT_SYMBOL(dquot_alloc); 820884d179dSJan Kara 821884d179dSJan Kara static struct dquot *get_empty_dquot(struct super_block *sb, int type) 822884d179dSJan Kara { 823884d179dSJan Kara struct dquot *dquot; 824884d179dSJan Kara 825884d179dSJan Kara dquot = sb->dq_op->alloc_dquot(sb, type); 826884d179dSJan Kara if(!dquot) 827dd6f3c6dSJan Kara return NULL; 828884d179dSJan Kara 829884d179dSJan Kara mutex_init(&dquot->dq_lock); 830884d179dSJan Kara INIT_LIST_HEAD(&dquot->dq_free); 831884d179dSJan Kara INIT_LIST_HEAD(&dquot->dq_inuse); 832884d179dSJan Kara INIT_HLIST_NODE(&dquot->dq_hash); 833884d179dSJan Kara INIT_LIST_HEAD(&dquot->dq_dirty); 834884d179dSJan Kara dquot->dq_sb = sb; 8351a06d420SEric W. Biederman dquot->dq_id = make_kqid_invalid(type); 836884d179dSJan Kara atomic_set(&dquot->dq_count, 1); 8377b9ca4c6SJan Kara spin_lock_init(&dquot->dq_dqb_lock); 838884d179dSJan Kara 839884d179dSJan Kara return dquot; 840884d179dSJan Kara } 841884d179dSJan Kara 842884d179dSJan Kara /* 843884d179dSJan Kara * Get reference to dquot 844884d179dSJan Kara * 845884d179dSJan Kara * Locking is slightly tricky here. We are guarded from parallel quotaoff() 846884d179dSJan Kara * destroying our dquot by: 847884d179dSJan Kara * a) checking for quota flags under dq_list_lock and 848884d179dSJan Kara * b) getting a reference to dquot before we release dq_list_lock 849884d179dSJan Kara */ 850aca645a6SEric W. Biederman struct dquot *dqget(struct super_block *sb, struct kqid qid) 851884d179dSJan Kara { 8521a06d420SEric W. Biederman unsigned int hashent = hashfn(sb, qid); 8536184fc0bSJan Kara struct dquot *dquot, *empty = NULL; 854884d179dSJan Kara 855d49d3762SEric W. Biederman if (!qid_has_mapping(sb->s_user_ns, qid)) 856d49d3762SEric W. Biederman return ERR_PTR(-EINVAL); 857d49d3762SEric W. Biederman 8581a06d420SEric W. Biederman if (!sb_has_quota_active(sb, qid.type)) 8596184fc0bSJan Kara return ERR_PTR(-ESRCH); 860884d179dSJan Kara we_slept: 861884d179dSJan Kara spin_lock(&dq_list_lock); 862884d179dSJan Kara spin_lock(&dq_state_lock); 8631a06d420SEric W. Biederman if (!sb_has_quota_active(sb, qid.type)) { 864884d179dSJan Kara spin_unlock(&dq_state_lock); 865884d179dSJan Kara spin_unlock(&dq_list_lock); 8666184fc0bSJan Kara dquot = ERR_PTR(-ESRCH); 867884d179dSJan Kara goto out; 868884d179dSJan Kara } 869884d179dSJan Kara spin_unlock(&dq_state_lock); 870884d179dSJan Kara 8711a06d420SEric W. Biederman dquot = find_dquot(hashent, sb, qid); 872dd6f3c6dSJan Kara if (!dquot) { 873dd6f3c6dSJan Kara if (!empty) { 874884d179dSJan Kara spin_unlock(&dq_list_lock); 8751a06d420SEric W. Biederman empty = get_empty_dquot(sb, qid.type); 876dd6f3c6dSJan Kara if (!empty) 877884d179dSJan Kara schedule(); /* Try to wait for a moment... */ 878884d179dSJan Kara goto we_slept; 879884d179dSJan Kara } 880884d179dSJan Kara dquot = empty; 881dd6f3c6dSJan Kara empty = NULL; 8824c376dcaSEric W. Biederman dquot->dq_id = qid; 883884d179dSJan Kara /* all dquots go on the inuse_list */ 884884d179dSJan Kara put_inuse(dquot); 885884d179dSJan Kara /* hash it first so it can be found */ 886884d179dSJan Kara insert_dquot_hash(dquot); 887884d179dSJan Kara spin_unlock(&dq_list_lock); 888dde95888SDmitry Monakhov dqstats_inc(DQST_LOOKUPS); 889884d179dSJan Kara } else { 890884d179dSJan Kara if (!atomic_read(&dquot->dq_count)) 891884d179dSJan Kara remove_free_dquot(dquot); 892884d179dSJan Kara atomic_inc(&dquot->dq_count); 893884d179dSJan Kara spin_unlock(&dq_list_lock); 894dde95888SDmitry Monakhov dqstats_inc(DQST_CACHE_HITS); 895dde95888SDmitry Monakhov dqstats_inc(DQST_LOOKUPS); 896884d179dSJan Kara } 897268157baSJan Kara /* Wait for dq_lock - after this we know that either dquot_release() is 898268157baSJan Kara * already finished or it will be canceled due to dq_count > 1 test */ 899884d179dSJan Kara wait_on_dquot(dquot); 900268157baSJan Kara /* Read the dquot / allocate space in quota file */ 9016184fc0bSJan Kara if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { 9026184fc0bSJan Kara int err; 9036184fc0bSJan Kara 9046184fc0bSJan Kara err = sb->dq_op->acquire_dquot(dquot); 9056184fc0bSJan Kara if (err < 0) { 906884d179dSJan Kara dqput(dquot); 9076184fc0bSJan Kara dquot = ERR_PTR(err); 908884d179dSJan Kara goto out; 909884d179dSJan Kara } 9106184fc0bSJan Kara } 911044c9b67SJan Kara /* 912044c9b67SJan Kara * Make sure following reads see filled structure - paired with 913044c9b67SJan Kara * smp_mb__before_atomic() in dquot_acquire(). 914044c9b67SJan Kara */ 915044c9b67SJan Kara smp_rmb(); 91662af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 917884d179dSJan Kara BUG_ON(!dquot->dq_sb); /* Has somebody invalidated entry under us? */ 918884d179dSJan Kara #endif 919884d179dSJan Kara out: 920884d179dSJan Kara if (empty) 921884d179dSJan Kara do_destroy_dquot(empty); 922884d179dSJan Kara 923884d179dSJan Kara return dquot; 924884d179dSJan Kara } 925884d179dSJan Kara EXPORT_SYMBOL(dqget); 926884d179dSJan Kara 9272d0fa467SJan Kara static inline struct dquot **i_dquot(struct inode *inode) 9282d0fa467SJan Kara { 9292d0fa467SJan Kara return inode->i_sb->s_op->get_dquots(inode); 9302d0fa467SJan Kara } 9312d0fa467SJan Kara 932884d179dSJan Kara static int dqinit_needed(struct inode *inode, int type) 933884d179dSJan Kara { 9345bcd3b6fSKonstantin Khlebnikov struct dquot * const *dquots; 935884d179dSJan Kara int cnt; 936884d179dSJan Kara 937884d179dSJan Kara if (IS_NOQUOTA(inode)) 938884d179dSJan Kara return 0; 9395bcd3b6fSKonstantin Khlebnikov 9405bcd3b6fSKonstantin Khlebnikov dquots = i_dquot(inode); 941884d179dSJan Kara if (type != -1) 9425bcd3b6fSKonstantin Khlebnikov return !dquots[type]; 943884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 9445bcd3b6fSKonstantin Khlebnikov if (!dquots[cnt]) 945884d179dSJan Kara return 1; 946884d179dSJan Kara return 0; 947884d179dSJan Kara } 948884d179dSJan Kara 949c3b00446SJan Kara /* This routine is guarded by s_umount semaphore */ 9501a6152d3SChao Yu static int add_dquot_ref(struct super_block *sb, int type) 951884d179dSJan Kara { 952884d179dSJan Kara struct inode *inode, *old_inode = NULL; 95362af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 9540a5a9c72SJan Kara int reserved = 0; 9554c5e6c0eSJan Kara #endif 9561a6152d3SChao Yu int err = 0; 957884d179dSJan Kara 95874278da9SDave Chinner spin_lock(&sb->s_inode_list_lock); 959884d179dSJan Kara list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { 960250df6edSDave Chinner spin_lock(&inode->i_lock); 961250df6edSDave Chinner if ((inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW)) || 962250df6edSDave Chinner !atomic_read(&inode->i_writecount) || 963250df6edSDave Chinner !dqinit_needed(inode, type)) { 964250df6edSDave Chinner spin_unlock(&inode->i_lock); 9653ae5080fSLinus Torvalds continue; 966250df6edSDave Chinner } 967884d179dSJan Kara __iget(inode); 968250df6edSDave Chinner spin_unlock(&inode->i_lock); 96974278da9SDave Chinner spin_unlock(&sb->s_inode_list_lock); 970884d179dSJan Kara 971d7e97117SJan Kara #ifdef CONFIG_QUOTA_DEBUG 972d7e97117SJan Kara if (unlikely(inode_get_rsv_space(inode) > 0)) 973d7e97117SJan Kara reserved = 1; 974d7e97117SJan Kara #endif 975884d179dSJan Kara iput(old_inode); 9761a6152d3SChao Yu err = __dquot_initialize(inode, type); 9771a6152d3SChao Yu if (err) { 9781a6152d3SChao Yu iput(inode); 9791a6152d3SChao Yu goto out; 9801a6152d3SChao Yu } 98155fa6091SDave Chinner 98255fa6091SDave Chinner /* 98355fa6091SDave Chinner * We hold a reference to 'inode' so it couldn't have been 98455fa6091SDave Chinner * removed from s_inodes list while we dropped the 98574278da9SDave Chinner * s_inode_list_lock. We cannot iput the inode now as we can be 98655fa6091SDave Chinner * holding the last reference and we cannot iput it under 98774278da9SDave Chinner * s_inode_list_lock. So we keep the reference and iput it 98855fa6091SDave Chinner * later. 98955fa6091SDave Chinner */ 990884d179dSJan Kara old_inode = inode; 99104646aebSEric Sandeen cond_resched(); 99274278da9SDave Chinner spin_lock(&sb->s_inode_list_lock); 993884d179dSJan Kara } 99474278da9SDave Chinner spin_unlock(&sb->s_inode_list_lock); 995884d179dSJan Kara iput(old_inode); 9961a6152d3SChao Yu out: 99762af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 9980a5a9c72SJan Kara if (reserved) { 999fb5ffb0eSJiaying Zhang quota_error(sb, "Writes happened before quota was turned on " 1000fb5ffb0eSJiaying Zhang "thus quota information is probably inconsistent. " 1001fb5ffb0eSJiaying Zhang "Please run quotacheck(8)"); 10020a5a9c72SJan Kara } 10034c5e6c0eSJan Kara #endif 10041a6152d3SChao Yu return err; 1005884d179dSJan Kara } 1006884d179dSJan Kara 1007268157baSJan Kara /* 1008268157baSJan Kara * Remove references to dquots from inode and add dquot to list for freeing 100925985edcSLucas De Marchi * if we have the last reference to dquot 1010268157baSJan Kara */ 10119eb6463fSNiu Yawei static void remove_inode_dquot_ref(struct inode *inode, int type, 1012884d179dSJan Kara struct list_head *tofree_head) 1013884d179dSJan Kara { 10145bcd3b6fSKonstantin Khlebnikov struct dquot **dquots = i_dquot(inode); 10155bcd3b6fSKonstantin Khlebnikov struct dquot *dquot = dquots[type]; 1016884d179dSJan Kara 10179eb6463fSNiu Yawei if (!dquot) 10189eb6463fSNiu Yawei return; 10199eb6463fSNiu Yawei 10205bcd3b6fSKonstantin Khlebnikov dquots[type] = NULL; 10219eb6463fSNiu Yawei if (list_empty(&dquot->dq_free)) { 10229eb6463fSNiu Yawei /* 10239eb6463fSNiu Yawei * The inode still has reference to dquot so it can't be in the 10249eb6463fSNiu Yawei * free list 10259eb6463fSNiu Yawei */ 1026884d179dSJan Kara spin_lock(&dq_list_lock); 1027268157baSJan Kara list_add(&dquot->dq_free, tofree_head); 1028884d179dSJan Kara spin_unlock(&dq_list_lock); 10299eb6463fSNiu Yawei } else { 10309eb6463fSNiu Yawei /* 10319eb6463fSNiu Yawei * Dquot is already in a list to put so we won't drop the last 10329eb6463fSNiu Yawei * reference here. 10339eb6463fSNiu Yawei */ 10349eb6463fSNiu Yawei dqput(dquot); 1035884d179dSJan Kara } 1036884d179dSJan Kara } 1037884d179dSJan Kara 1038268157baSJan Kara /* 1039268157baSJan Kara * Free list of dquots 1040268157baSJan Kara * Dquots are removed from inodes and no new references can be got so we are 1041268157baSJan Kara * the only ones holding reference 1042268157baSJan Kara */ 1043884d179dSJan Kara static void put_dquot_list(struct list_head *tofree_head) 1044884d179dSJan Kara { 1045884d179dSJan Kara struct list_head *act_head; 1046884d179dSJan Kara struct dquot *dquot; 1047884d179dSJan Kara 1048884d179dSJan Kara act_head = tofree_head->next; 1049884d179dSJan Kara while (act_head != tofree_head) { 1050884d179dSJan Kara dquot = list_entry(act_head, struct dquot, dq_free); 1051884d179dSJan Kara act_head = act_head->next; 1052268157baSJan Kara /* Remove dquot from the list so we won't have problems... */ 1053268157baSJan Kara list_del_init(&dquot->dq_free); 1054884d179dSJan Kara dqput(dquot); 1055884d179dSJan Kara } 1056884d179dSJan Kara } 1057884d179dSJan Kara 1058884d179dSJan Kara static void remove_dquot_ref(struct super_block *sb, int type, 1059884d179dSJan Kara struct list_head *tofree_head) 1060884d179dSJan Kara { 1061884d179dSJan Kara struct inode *inode; 106278bc3334SJiang Biao #ifdef CONFIG_QUOTA_DEBUG 10637af9cce8SDmitry Monakhov int reserved = 0; 106478bc3334SJiang Biao #endif 1065884d179dSJan Kara 106674278da9SDave Chinner spin_lock(&sb->s_inode_list_lock); 1067884d179dSJan Kara list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { 10683ae5080fSLinus Torvalds /* 10693ae5080fSLinus Torvalds * We have to scan also I_NEW inodes because they can already 10703ae5080fSLinus Torvalds * have quota pointer initialized. Luckily, we need to touch 10713ae5080fSLinus Torvalds * only quota pointers and these have separate locking 1072b9ba6f94SNiu Yawei * (dq_data_lock). 10733ae5080fSLinus Torvalds */ 1074b9ba6f94SNiu Yawei spin_lock(&dq_data_lock); 10757af9cce8SDmitry Monakhov if (!IS_NOQUOTA(inode)) { 107678bc3334SJiang Biao #ifdef CONFIG_QUOTA_DEBUG 10777af9cce8SDmitry Monakhov if (unlikely(inode_get_rsv_space(inode) > 0)) 10787af9cce8SDmitry Monakhov reserved = 1; 107978bc3334SJiang Biao #endif 1080884d179dSJan Kara remove_inode_dquot_ref(inode, type, tofree_head); 1081884d179dSJan Kara } 1082b9ba6f94SNiu Yawei spin_unlock(&dq_data_lock); 10837af9cce8SDmitry Monakhov } 108474278da9SDave Chinner spin_unlock(&sb->s_inode_list_lock); 10857af9cce8SDmitry Monakhov #ifdef CONFIG_QUOTA_DEBUG 10867af9cce8SDmitry Monakhov if (reserved) { 10877af9cce8SDmitry Monakhov printk(KERN_WARNING "VFS (%s): Writes happened after quota" 10887af9cce8SDmitry Monakhov " was disabled thus quota information is probably " 10897af9cce8SDmitry Monakhov "inconsistent. Please run quotacheck(8).\n", sb->s_id); 10907af9cce8SDmitry Monakhov } 10917af9cce8SDmitry Monakhov #endif 1092884d179dSJan Kara } 1093884d179dSJan Kara 1094884d179dSJan Kara /* Gather all references from inodes and drop them */ 1095884d179dSJan Kara static void drop_dquot_ref(struct super_block *sb, int type) 1096884d179dSJan Kara { 1097884d179dSJan Kara LIST_HEAD(tofree_head); 1098884d179dSJan Kara 1099884d179dSJan Kara if (sb->dq_op) { 1100884d179dSJan Kara remove_dquot_ref(sb, type, &tofree_head); 1101b9ba6f94SNiu Yawei synchronize_srcu(&dquot_srcu); 1102884d179dSJan Kara put_dquot_list(&tofree_head); 1103884d179dSJan Kara } 1104884d179dSJan Kara } 1105884d179dSJan Kara 1106884d179dSJan Kara static inline 1107884d179dSJan Kara void dquot_free_reserved_space(struct dquot *dquot, qsize_t number) 1108884d179dSJan Kara { 11090a5a9c72SJan Kara if (dquot->dq_dqb.dqb_rsvspace >= number) 1110884d179dSJan Kara dquot->dq_dqb.dqb_rsvspace -= number; 11110a5a9c72SJan Kara else { 11120a5a9c72SJan Kara WARN_ON_ONCE(1); 11130a5a9c72SJan Kara dquot->dq_dqb.dqb_rsvspace = 0; 11140a5a9c72SJan Kara } 111541e327b5Szhangyi (F) if (dquot->dq_dqb.dqb_curspace + dquot->dq_dqb.dqb_rsvspace <= 111641e327b5Szhangyi (F) dquot->dq_dqb.dqb_bsoftlimit) 111741e327b5Szhangyi (F) dquot->dq_dqb.dqb_btime = (time64_t) 0; 111841e327b5Szhangyi (F) clear_bit(DQ_BLKS_B, &dquot->dq_flags); 1119884d179dSJan Kara } 1120884d179dSJan Kara 11217a2435d8SJan Kara static void dquot_decr_inodes(struct dquot *dquot, qsize_t number) 1122884d179dSJan Kara { 1123884d179dSJan Kara if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE || 1124884d179dSJan Kara dquot->dq_dqb.dqb_curinodes >= number) 1125884d179dSJan Kara dquot->dq_dqb.dqb_curinodes -= number; 1126884d179dSJan Kara else 1127884d179dSJan Kara dquot->dq_dqb.dqb_curinodes = 0; 1128884d179dSJan Kara if (dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit) 1129e008bb61SArnd Bergmann dquot->dq_dqb.dqb_itime = (time64_t) 0; 1130884d179dSJan Kara clear_bit(DQ_INODES_B, &dquot->dq_flags); 1131884d179dSJan Kara } 1132884d179dSJan Kara 11337a2435d8SJan Kara static void dquot_decr_space(struct dquot *dquot, qsize_t number) 1134884d179dSJan Kara { 1135884d179dSJan Kara if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE || 1136884d179dSJan Kara dquot->dq_dqb.dqb_curspace >= number) 1137884d179dSJan Kara dquot->dq_dqb.dqb_curspace -= number; 1138884d179dSJan Kara else 1139884d179dSJan Kara dquot->dq_dqb.dqb_curspace = 0; 114041e327b5Szhangyi (F) if (dquot->dq_dqb.dqb_curspace + dquot->dq_dqb.dqb_rsvspace <= 114141e327b5Szhangyi (F) dquot->dq_dqb.dqb_bsoftlimit) 1142e008bb61SArnd Bergmann dquot->dq_dqb.dqb_btime = (time64_t) 0; 1143884d179dSJan Kara clear_bit(DQ_BLKS_B, &dquot->dq_flags); 1144884d179dSJan Kara } 1145884d179dSJan Kara 1146bf097aafSJan Kara struct dquot_warn { 1147bf097aafSJan Kara struct super_block *w_sb; 11487b9c7321SEric W. Biederman struct kqid w_dq_id; 1149bf097aafSJan Kara short w_type; 1150bf097aafSJan Kara }; 1151bf097aafSJan Kara 1152884d179dSJan Kara static int warning_issued(struct dquot *dquot, const int warntype) 1153884d179dSJan Kara { 1154884d179dSJan Kara int flag = (warntype == QUOTA_NL_BHARDWARN || 1155884d179dSJan Kara warntype == QUOTA_NL_BSOFTLONGWARN) ? DQ_BLKS_B : 1156884d179dSJan Kara ((warntype == QUOTA_NL_IHARDWARN || 1157884d179dSJan Kara warntype == QUOTA_NL_ISOFTLONGWARN) ? DQ_INODES_B : 0); 1158884d179dSJan Kara 1159884d179dSJan Kara if (!flag) 1160884d179dSJan Kara return 0; 1161884d179dSJan Kara return test_and_set_bit(flag, &dquot->dq_flags); 1162884d179dSJan Kara } 1163884d179dSJan Kara 1164884d179dSJan Kara #ifdef CONFIG_PRINT_QUOTA_WARNING 1165884d179dSJan Kara static int flag_print_warnings = 1; 1166884d179dSJan Kara 1167bf097aafSJan Kara static int need_print_warning(struct dquot_warn *warn) 1168884d179dSJan Kara { 1169884d179dSJan Kara if (!flag_print_warnings) 1170884d179dSJan Kara return 0; 1171884d179dSJan Kara 11727b9c7321SEric W. Biederman switch (warn->w_dq_id.type) { 1173884d179dSJan Kara case USRQUOTA: 11741a06d420SEric W. Biederman return uid_eq(current_fsuid(), warn->w_dq_id.uid); 1175884d179dSJan Kara case GRPQUOTA: 11767b9c7321SEric W. Biederman return in_group_p(warn->w_dq_id.gid); 1177847aac64SLi Xi case PRJQUOTA: 1178847aac64SLi Xi return 1; 1179884d179dSJan Kara } 1180884d179dSJan Kara return 0; 1181884d179dSJan Kara } 1182884d179dSJan Kara 1183884d179dSJan Kara /* Print warning to user which exceeded quota */ 1184bf097aafSJan Kara static void print_warning(struct dquot_warn *warn) 1185884d179dSJan Kara { 1186884d179dSJan Kara char *msg = NULL; 1187884d179dSJan Kara struct tty_struct *tty; 1188bf097aafSJan Kara int warntype = warn->w_type; 1189884d179dSJan Kara 1190884d179dSJan Kara if (warntype == QUOTA_NL_IHARDBELOW || 1191884d179dSJan Kara warntype == QUOTA_NL_ISOFTBELOW || 1192884d179dSJan Kara warntype == QUOTA_NL_BHARDBELOW || 1193bf097aafSJan Kara warntype == QUOTA_NL_BSOFTBELOW || !need_print_warning(warn)) 1194884d179dSJan Kara return; 1195884d179dSJan Kara 1196884d179dSJan Kara tty = get_current_tty(); 1197884d179dSJan Kara if (!tty) 1198884d179dSJan Kara return; 1199bf097aafSJan Kara tty_write_message(tty, warn->w_sb->s_id); 1200884d179dSJan Kara if (warntype == QUOTA_NL_ISOFTWARN || warntype == QUOTA_NL_BSOFTWARN) 1201884d179dSJan Kara tty_write_message(tty, ": warning, "); 1202884d179dSJan Kara else 1203884d179dSJan Kara tty_write_message(tty, ": write failed, "); 12047b9c7321SEric W. Biederman tty_write_message(tty, quotatypes[warn->w_dq_id.type]); 1205884d179dSJan Kara switch (warntype) { 1206884d179dSJan Kara case QUOTA_NL_IHARDWARN: 1207884d179dSJan Kara msg = " file limit reached.\r\n"; 1208884d179dSJan Kara break; 1209884d179dSJan Kara case QUOTA_NL_ISOFTLONGWARN: 1210884d179dSJan Kara msg = " file quota exceeded too long.\r\n"; 1211884d179dSJan Kara break; 1212884d179dSJan Kara case QUOTA_NL_ISOFTWARN: 1213884d179dSJan Kara msg = " file quota exceeded.\r\n"; 1214884d179dSJan Kara break; 1215884d179dSJan Kara case QUOTA_NL_BHARDWARN: 1216884d179dSJan Kara msg = " block limit reached.\r\n"; 1217884d179dSJan Kara break; 1218884d179dSJan Kara case QUOTA_NL_BSOFTLONGWARN: 1219884d179dSJan Kara msg = " block quota exceeded too long.\r\n"; 1220884d179dSJan Kara break; 1221884d179dSJan Kara case QUOTA_NL_BSOFTWARN: 1222884d179dSJan Kara msg = " block quota exceeded.\r\n"; 1223884d179dSJan Kara break; 1224884d179dSJan Kara } 1225884d179dSJan Kara tty_write_message(tty, msg); 1226884d179dSJan Kara tty_kref_put(tty); 1227884d179dSJan Kara } 1228884d179dSJan Kara #endif 1229884d179dSJan Kara 1230bf097aafSJan Kara static void prepare_warning(struct dquot_warn *warn, struct dquot *dquot, 1231bf097aafSJan Kara int warntype) 1232bf097aafSJan Kara { 1233bf097aafSJan Kara if (warning_issued(dquot, warntype)) 1234bf097aafSJan Kara return; 1235bf097aafSJan Kara warn->w_type = warntype; 1236bf097aafSJan Kara warn->w_sb = dquot->dq_sb; 1237bf097aafSJan Kara warn->w_dq_id = dquot->dq_id; 1238bf097aafSJan Kara } 1239bf097aafSJan Kara 1240884d179dSJan Kara /* 1241884d179dSJan Kara * Write warnings to the console and send warning messages over netlink. 1242884d179dSJan Kara * 1243bf097aafSJan Kara * Note that this function can call into tty and networking code. 1244884d179dSJan Kara */ 1245bf097aafSJan Kara static void flush_warnings(struct dquot_warn *warn) 1246884d179dSJan Kara { 1247884d179dSJan Kara int i; 1248884d179dSJan Kara 124986e931a3SSteven Whitehouse for (i = 0; i < MAXQUOTAS; i++) { 1250bf097aafSJan Kara if (warn[i].w_type == QUOTA_NL_NOWARN) 1251bf097aafSJan Kara continue; 1252884d179dSJan Kara #ifdef CONFIG_PRINT_QUOTA_WARNING 1253bf097aafSJan Kara print_warning(&warn[i]); 1254884d179dSJan Kara #endif 12557b9c7321SEric W. Biederman quota_send_warning(warn[i].w_dq_id, 1256bf097aafSJan Kara warn[i].w_sb->s_dev, warn[i].w_type); 1257884d179dSJan Kara } 1258884d179dSJan Kara } 1259884d179dSJan Kara 12607a2435d8SJan Kara static int ignore_hardlimit(struct dquot *dquot) 1261884d179dSJan Kara { 12624c376dcaSEric W. Biederman struct mem_dqinfo *info = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_id.type]; 1263884d179dSJan Kara 1264884d179dSJan Kara return capable(CAP_SYS_RESOURCE) && 1265268157baSJan Kara (info->dqi_format->qf_fmt_id != QFMT_VFS_OLD || 12669c45101eSJan Kara !(info->dqi_flags & DQF_ROOT_SQUASH)); 1267884d179dSJan Kara } 1268884d179dSJan Kara 12697b9ca4c6SJan Kara static int dquot_add_inodes(struct dquot *dquot, qsize_t inodes, 1270bf097aafSJan Kara struct dquot_warn *warn) 1271884d179dSJan Kara { 12727b9ca4c6SJan Kara qsize_t newinodes; 12737b9ca4c6SJan Kara int ret = 0; 1274268157baSJan Kara 12757b9ca4c6SJan Kara spin_lock(&dquot->dq_dqb_lock); 12767b9ca4c6SJan Kara newinodes = dquot->dq_dqb.dqb_curinodes + inodes; 12774c376dcaSEric W. Biederman if (!sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_id.type) || 1278884d179dSJan Kara test_bit(DQ_FAKE_B, &dquot->dq_flags)) 12797b9ca4c6SJan Kara goto add; 1280884d179dSJan Kara 1281884d179dSJan Kara if (dquot->dq_dqb.dqb_ihardlimit && 1282268157baSJan Kara newinodes > dquot->dq_dqb.dqb_ihardlimit && 1283884d179dSJan Kara !ignore_hardlimit(dquot)) { 1284bf097aafSJan Kara prepare_warning(warn, dquot, QUOTA_NL_IHARDWARN); 12857b9ca4c6SJan Kara ret = -EDQUOT; 12867b9ca4c6SJan Kara goto out; 1287884d179dSJan Kara } 1288884d179dSJan Kara 1289884d179dSJan Kara if (dquot->dq_dqb.dqb_isoftlimit && 1290268157baSJan Kara newinodes > dquot->dq_dqb.dqb_isoftlimit && 1291268157baSJan Kara dquot->dq_dqb.dqb_itime && 1292e008bb61SArnd Bergmann ktime_get_real_seconds() >= dquot->dq_dqb.dqb_itime && 1293884d179dSJan Kara !ignore_hardlimit(dquot)) { 1294bf097aafSJan Kara prepare_warning(warn, dquot, QUOTA_NL_ISOFTLONGWARN); 12957b9ca4c6SJan Kara ret = -EDQUOT; 12967b9ca4c6SJan Kara goto out; 1297884d179dSJan Kara } 1298884d179dSJan Kara 1299884d179dSJan Kara if (dquot->dq_dqb.dqb_isoftlimit && 1300268157baSJan Kara newinodes > dquot->dq_dqb.dqb_isoftlimit && 1301884d179dSJan Kara dquot->dq_dqb.dqb_itime == 0) { 1302bf097aafSJan Kara prepare_warning(warn, dquot, QUOTA_NL_ISOFTWARN); 1303e008bb61SArnd Bergmann dquot->dq_dqb.dqb_itime = ktime_get_real_seconds() + 13044c376dcaSEric W. Biederman sb_dqopt(dquot->dq_sb)->info[dquot->dq_id.type].dqi_igrace; 1305884d179dSJan Kara } 13067b9ca4c6SJan Kara add: 13077b9ca4c6SJan Kara dquot->dq_dqb.dqb_curinodes = newinodes; 1308884d179dSJan Kara 13097b9ca4c6SJan Kara out: 13107b9ca4c6SJan Kara spin_unlock(&dquot->dq_dqb_lock); 13117b9ca4c6SJan Kara return ret; 1312884d179dSJan Kara } 1313884d179dSJan Kara 13147b9ca4c6SJan Kara static int dquot_add_space(struct dquot *dquot, qsize_t space, 13157b9ca4c6SJan Kara qsize_t rsv_space, unsigned int flags, 1316bf097aafSJan Kara struct dquot_warn *warn) 1317884d179dSJan Kara { 1318884d179dSJan Kara qsize_t tspace; 1319268157baSJan Kara struct super_block *sb = dquot->dq_sb; 13207b9ca4c6SJan Kara int ret = 0; 1321884d179dSJan Kara 13227b9ca4c6SJan Kara spin_lock(&dquot->dq_dqb_lock); 13234c376dcaSEric W. Biederman if (!sb_has_quota_limits_enabled(sb, dquot->dq_id.type) || 1324884d179dSJan Kara test_bit(DQ_FAKE_B, &dquot->dq_flags)) 1325ac3d7939SJan Kara goto finish; 1326884d179dSJan Kara 1327884d179dSJan Kara tspace = dquot->dq_dqb.dqb_curspace + dquot->dq_dqb.dqb_rsvspace 13287b9ca4c6SJan Kara + space + rsv_space; 13297b9ca4c6SJan Kara 1330884d179dSJan Kara if (dquot->dq_dqb.dqb_bhardlimit && 1331884d179dSJan Kara tspace > dquot->dq_dqb.dqb_bhardlimit && 1332884d179dSJan Kara !ignore_hardlimit(dquot)) { 13337b9ca4c6SJan Kara if (flags & DQUOT_SPACE_WARN) 1334bf097aafSJan Kara prepare_warning(warn, dquot, QUOTA_NL_BHARDWARN); 13357b9ca4c6SJan Kara ret = -EDQUOT; 1336ac3d7939SJan Kara goto finish; 1337884d179dSJan Kara } 1338884d179dSJan Kara 1339884d179dSJan Kara if (dquot->dq_dqb.dqb_bsoftlimit && 1340884d179dSJan Kara tspace > dquot->dq_dqb.dqb_bsoftlimit && 1341268157baSJan Kara dquot->dq_dqb.dqb_btime && 1342e008bb61SArnd Bergmann ktime_get_real_seconds() >= dquot->dq_dqb.dqb_btime && 1343884d179dSJan Kara !ignore_hardlimit(dquot)) { 13447b9ca4c6SJan Kara if (flags & DQUOT_SPACE_WARN) 1345bf097aafSJan Kara prepare_warning(warn, dquot, QUOTA_NL_BSOFTLONGWARN); 13467b9ca4c6SJan Kara ret = -EDQUOT; 1347ac3d7939SJan Kara goto finish; 1348884d179dSJan Kara } 1349884d179dSJan Kara 1350884d179dSJan Kara if (dquot->dq_dqb.dqb_bsoftlimit && 1351884d179dSJan Kara tspace > dquot->dq_dqb.dqb_bsoftlimit && 1352884d179dSJan Kara dquot->dq_dqb.dqb_btime == 0) { 13537b9ca4c6SJan Kara if (flags & DQUOT_SPACE_WARN) { 1354bf097aafSJan Kara prepare_warning(warn, dquot, QUOTA_NL_BSOFTWARN); 1355e008bb61SArnd Bergmann dquot->dq_dqb.dqb_btime = ktime_get_real_seconds() + 13564c376dcaSEric W. Biederman sb_dqopt(sb)->info[dquot->dq_id.type].dqi_bgrace; 13577b9ca4c6SJan Kara } else { 1358884d179dSJan Kara /* 1359884d179dSJan Kara * We don't allow preallocation to exceed softlimit so exceeding will 1360884d179dSJan Kara * be always printed 1361884d179dSJan Kara */ 13627b9ca4c6SJan Kara ret = -EDQUOT; 1363ac3d7939SJan Kara goto finish; 1364884d179dSJan Kara } 13657b9ca4c6SJan Kara } 1366ac3d7939SJan Kara finish: 1367ac3d7939SJan Kara /* 1368ac3d7939SJan Kara * We have to be careful and go through warning generation & grace time 1369ac3d7939SJan Kara * setting even if DQUOT_SPACE_NOFAIL is set. That's why we check it 1370ac3d7939SJan Kara * only here... 1371ac3d7939SJan Kara */ 1372ac3d7939SJan Kara if (flags & DQUOT_SPACE_NOFAIL) 1373ac3d7939SJan Kara ret = 0; 1374ac3d7939SJan Kara if (!ret) { 13757b9ca4c6SJan Kara dquot->dq_dqb.dqb_rsvspace += rsv_space; 13767b9ca4c6SJan Kara dquot->dq_dqb.dqb_curspace += space; 1377ac3d7939SJan Kara } 13787b9ca4c6SJan Kara spin_unlock(&dquot->dq_dqb_lock); 13797b9ca4c6SJan Kara return ret; 1380884d179dSJan Kara } 1381884d179dSJan Kara 1382884d179dSJan Kara static int info_idq_free(struct dquot *dquot, qsize_t inodes) 1383884d179dSJan Kara { 1384268157baSJan Kara qsize_t newinodes; 1385268157baSJan Kara 1386884d179dSJan Kara if (test_bit(DQ_FAKE_B, &dquot->dq_flags) || 1387884d179dSJan Kara dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit || 13884c376dcaSEric W. Biederman !sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_id.type)) 1389884d179dSJan Kara return QUOTA_NL_NOWARN; 1390884d179dSJan Kara 1391268157baSJan Kara newinodes = dquot->dq_dqb.dqb_curinodes - inodes; 1392268157baSJan Kara if (newinodes <= dquot->dq_dqb.dqb_isoftlimit) 1393884d179dSJan Kara return QUOTA_NL_ISOFTBELOW; 1394884d179dSJan Kara if (dquot->dq_dqb.dqb_curinodes >= dquot->dq_dqb.dqb_ihardlimit && 1395268157baSJan Kara newinodes < dquot->dq_dqb.dqb_ihardlimit) 1396884d179dSJan Kara return QUOTA_NL_IHARDBELOW; 1397884d179dSJan Kara return QUOTA_NL_NOWARN; 1398884d179dSJan Kara } 1399884d179dSJan Kara 1400884d179dSJan Kara static int info_bdq_free(struct dquot *dquot, qsize_t space) 1401884d179dSJan Kara { 140241e327b5Szhangyi (F) qsize_t tspace; 140341e327b5Szhangyi (F) 140441e327b5Szhangyi (F) tspace = dquot->dq_dqb.dqb_curspace + dquot->dq_dqb.dqb_rsvspace; 140541e327b5Szhangyi (F) 1406884d179dSJan Kara if (test_bit(DQ_FAKE_B, &dquot->dq_flags) || 140741e327b5Szhangyi (F) tspace <= dquot->dq_dqb.dqb_bsoftlimit) 1408884d179dSJan Kara return QUOTA_NL_NOWARN; 1409884d179dSJan Kara 141041e327b5Szhangyi (F) if (tspace - space <= dquot->dq_dqb.dqb_bsoftlimit) 1411884d179dSJan Kara return QUOTA_NL_BSOFTBELOW; 141241e327b5Szhangyi (F) if (tspace >= dquot->dq_dqb.dqb_bhardlimit && 141341e327b5Szhangyi (F) tspace - space < dquot->dq_dqb.dqb_bhardlimit) 1414884d179dSJan Kara return QUOTA_NL_BHARDBELOW; 1415884d179dSJan Kara return QUOTA_NL_NOWARN; 1416884d179dSJan Kara } 14170a5a9c72SJan Kara 1418189eef59SChristoph Hellwig static int dquot_active(const struct inode *inode) 1419189eef59SChristoph Hellwig { 1420189eef59SChristoph Hellwig struct super_block *sb = inode->i_sb; 1421189eef59SChristoph Hellwig 1422189eef59SChristoph Hellwig if (IS_NOQUOTA(inode)) 1423189eef59SChristoph Hellwig return 0; 1424189eef59SChristoph Hellwig return sb_any_quota_loaded(sb) & ~sb_any_quota_suspended(sb); 1425189eef59SChristoph Hellwig } 1426189eef59SChristoph Hellwig 1427884d179dSJan Kara /* 1428884d179dSJan Kara * Initialize quota pointers in inode 1429871a2931SChristoph Hellwig * 1430871a2931SChristoph Hellwig * It is better to call this function outside of any transaction as it 1431871a2931SChristoph Hellwig * might need a lot of space in journal for dquot structure allocation. 1432884d179dSJan Kara */ 14336184fc0bSJan Kara static int __dquot_initialize(struct inode *inode, int type) 1434884d179dSJan Kara { 14351ea06becSNiu Yawei int cnt, init_needed = 0; 1436ab73ef46SNikolay Borisov struct dquot **dquots, *got[MAXQUOTAS] = {}; 1437884d179dSJan Kara struct super_block *sb = inode->i_sb; 14380a5a9c72SJan Kara qsize_t rsv; 14396184fc0bSJan Kara int ret = 0; 1440884d179dSJan Kara 1441189eef59SChristoph Hellwig if (!dquot_active(inode)) 14426184fc0bSJan Kara return 0; 1443884d179dSJan Kara 14445bcd3b6fSKonstantin Khlebnikov dquots = i_dquot(inode); 14455bcd3b6fSKonstantin Khlebnikov 1446884d179dSJan Kara /* First get references to structures we might need. */ 1447884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1448aca645a6SEric W. Biederman struct kqid qid; 1449847aac64SLi Xi kprojid_t projid; 1450847aac64SLi Xi int rc; 14516184fc0bSJan Kara struct dquot *dquot; 1452847aac64SLi Xi 1453884d179dSJan Kara if (type != -1 && cnt != type) 1454884d179dSJan Kara continue; 14551ea06becSNiu Yawei /* 14561ea06becSNiu Yawei * The i_dquot should have been initialized in most cases, 14571ea06becSNiu Yawei * we check it without locking here to avoid unnecessary 14581ea06becSNiu Yawei * dqget()/dqput() calls. 14591ea06becSNiu Yawei */ 14605bcd3b6fSKonstantin Khlebnikov if (dquots[cnt]) 14611ea06becSNiu Yawei continue; 1462847aac64SLi Xi 1463847aac64SLi Xi if (!sb_has_quota_active(sb, cnt)) 1464847aac64SLi Xi continue; 1465847aac64SLi Xi 14661ea06becSNiu Yawei init_needed = 1; 14671ea06becSNiu Yawei 1468884d179dSJan Kara switch (cnt) { 1469884d179dSJan Kara case USRQUOTA: 1470aca645a6SEric W. Biederman qid = make_kqid_uid(inode->i_uid); 1471884d179dSJan Kara break; 1472884d179dSJan Kara case GRPQUOTA: 1473aca645a6SEric W. Biederman qid = make_kqid_gid(inode->i_gid); 1474884d179dSJan Kara break; 1475847aac64SLi Xi case PRJQUOTA: 1476847aac64SLi Xi rc = inode->i_sb->dq_op->get_projid(inode, &projid); 1477847aac64SLi Xi if (rc) 1478847aac64SLi Xi continue; 1479847aac64SLi Xi qid = make_kqid_projid(projid); 1480847aac64SLi Xi break; 1481884d179dSJan Kara } 14826184fc0bSJan Kara dquot = dqget(sb, qid); 14836184fc0bSJan Kara if (IS_ERR(dquot)) { 14846184fc0bSJan Kara /* We raced with somebody turning quotas off... */ 14856184fc0bSJan Kara if (PTR_ERR(dquot) != -ESRCH) { 14866184fc0bSJan Kara ret = PTR_ERR(dquot); 14876184fc0bSJan Kara goto out_put; 14886184fc0bSJan Kara } 14896184fc0bSJan Kara dquot = NULL; 14906184fc0bSJan Kara } 14916184fc0bSJan Kara got[cnt] = dquot; 1492884d179dSJan Kara } 1493884d179dSJan Kara 14941ea06becSNiu Yawei /* All required i_dquot has been initialized */ 14951ea06becSNiu Yawei if (!init_needed) 14966184fc0bSJan Kara return 0; 14971ea06becSNiu Yawei 1498b9ba6f94SNiu Yawei spin_lock(&dq_data_lock); 1499884d179dSJan Kara if (IS_NOQUOTA(inode)) 15006184fc0bSJan Kara goto out_lock; 1501884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1502884d179dSJan Kara if (type != -1 && cnt != type) 1503884d179dSJan Kara continue; 1504884d179dSJan Kara /* Avoid races with quotaoff() */ 1505884d179dSJan Kara if (!sb_has_quota_active(sb, cnt)) 1506884d179dSJan Kara continue; 15074408ea41SJan Kara /* We could race with quotaon or dqget() could have failed */ 15084408ea41SJan Kara if (!got[cnt]) 15094408ea41SJan Kara continue; 15105bcd3b6fSKonstantin Khlebnikov if (!dquots[cnt]) { 15115bcd3b6fSKonstantin Khlebnikov dquots[cnt] = got[cnt]; 1512dd6f3c6dSJan Kara got[cnt] = NULL; 15130a5a9c72SJan Kara /* 15140a5a9c72SJan Kara * Make quota reservation system happy if someone 15150a5a9c72SJan Kara * did a write before quota was turned on 15160a5a9c72SJan Kara */ 15170a5a9c72SJan Kara rsv = inode_get_rsv_space(inode); 15187b9ca4c6SJan Kara if (unlikely(rsv)) { 15197b9ca4c6SJan Kara spin_lock(&inode->i_lock); 15207b9ca4c6SJan Kara /* Get reservation again under proper lock */ 15217b9ca4c6SJan Kara rsv = __inode_get_rsv_space(inode); 15227b9ca4c6SJan Kara spin_lock(&dquots[cnt]->dq_dqb_lock); 15237b9ca4c6SJan Kara dquots[cnt]->dq_dqb.dqb_rsvspace += rsv; 15247b9ca4c6SJan Kara spin_unlock(&dquots[cnt]->dq_dqb_lock); 15257b9ca4c6SJan Kara spin_unlock(&inode->i_lock); 15267b9ca4c6SJan Kara } 1527884d179dSJan Kara } 1528884d179dSJan Kara } 15296184fc0bSJan Kara out_lock: 1530b9ba6f94SNiu Yawei spin_unlock(&dq_data_lock); 15316184fc0bSJan Kara out_put: 1532884d179dSJan Kara /* Drop unused references */ 1533dc52dd3aSDmitry Monakhov dqput_all(got); 15346184fc0bSJan Kara 15356184fc0bSJan Kara return ret; 1536871a2931SChristoph Hellwig } 1537871a2931SChristoph Hellwig 15386184fc0bSJan Kara int dquot_initialize(struct inode *inode) 1539871a2931SChristoph Hellwig { 15406184fc0bSJan Kara return __dquot_initialize(inode, -1); 1541884d179dSJan Kara } 1542884d179dSJan Kara EXPORT_SYMBOL(dquot_initialize); 1543884d179dSJan Kara 1544b8cb5a54STahsin Erdogan bool dquot_initialize_needed(struct inode *inode) 1545b8cb5a54STahsin Erdogan { 1546b8cb5a54STahsin Erdogan struct dquot **dquots; 1547b8cb5a54STahsin Erdogan int i; 1548b8cb5a54STahsin Erdogan 1549b8cb5a54STahsin Erdogan if (!dquot_active(inode)) 1550b8cb5a54STahsin Erdogan return false; 1551b8cb5a54STahsin Erdogan 1552b8cb5a54STahsin Erdogan dquots = i_dquot(inode); 1553b8cb5a54STahsin Erdogan for (i = 0; i < MAXQUOTAS; i++) 1554b8cb5a54STahsin Erdogan if (!dquots[i] && sb_has_quota_active(inode->i_sb, i)) 1555b8cb5a54STahsin Erdogan return true; 1556b8cb5a54STahsin Erdogan return false; 1557b8cb5a54STahsin Erdogan } 1558b8cb5a54STahsin Erdogan EXPORT_SYMBOL(dquot_initialize_needed); 1559b8cb5a54STahsin Erdogan 1560884d179dSJan Kara /* 1561b9ba6f94SNiu Yawei * Release all quotas referenced by inode. 1562b9ba6f94SNiu Yawei * 1563b9ba6f94SNiu Yawei * This function only be called on inode free or converting 1564b9ba6f94SNiu Yawei * a file to quota file, no other users for the i_dquot in 1565b9ba6f94SNiu Yawei * both cases, so we needn't call synchronize_srcu() after 1566b9ba6f94SNiu Yawei * clearing i_dquot. 1567884d179dSJan Kara */ 15689f754758SChristoph Hellwig static void __dquot_drop(struct inode *inode) 1569884d179dSJan Kara { 1570884d179dSJan Kara int cnt; 15715bcd3b6fSKonstantin Khlebnikov struct dquot **dquots = i_dquot(inode); 1572884d179dSJan Kara struct dquot *put[MAXQUOTAS]; 1573884d179dSJan Kara 1574b9ba6f94SNiu Yawei spin_lock(&dq_data_lock); 1575884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 15765bcd3b6fSKonstantin Khlebnikov put[cnt] = dquots[cnt]; 15775bcd3b6fSKonstantin Khlebnikov dquots[cnt] = NULL; 1578884d179dSJan Kara } 1579b9ba6f94SNiu Yawei spin_unlock(&dq_data_lock); 1580dc52dd3aSDmitry Monakhov dqput_all(put); 1581884d179dSJan Kara } 1582884d179dSJan Kara 15839f754758SChristoph Hellwig void dquot_drop(struct inode *inode) 1584884d179dSJan Kara { 15855bcd3b6fSKonstantin Khlebnikov struct dquot * const *dquots; 1586884d179dSJan Kara int cnt; 15879f754758SChristoph Hellwig 15889f754758SChristoph Hellwig if (IS_NOQUOTA(inode)) 15899f754758SChristoph Hellwig return; 15909f754758SChristoph Hellwig 15919f754758SChristoph Hellwig /* 15929f754758SChristoph Hellwig * Test before calling to rule out calls from proc and such 1593884d179dSJan Kara * where we are not allowed to block. Note that this is 1594884d179dSJan Kara * actually reliable test even without the lock - the caller 1595884d179dSJan Kara * must assure that nobody can come after the DQUOT_DROP and 15969f754758SChristoph Hellwig * add quota pointers back anyway. 15979f754758SChristoph Hellwig */ 15985bcd3b6fSKonstantin Khlebnikov dquots = i_dquot(inode); 15999f754758SChristoph Hellwig for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 16005bcd3b6fSKonstantin Khlebnikov if (dquots[cnt]) 1601884d179dSJan Kara break; 16029f754758SChristoph Hellwig } 16039f754758SChristoph Hellwig 1604884d179dSJan Kara if (cnt < MAXQUOTAS) 16059f754758SChristoph Hellwig __dquot_drop(inode); 1606884d179dSJan Kara } 16079f754758SChristoph Hellwig EXPORT_SYMBOL(dquot_drop); 1608884d179dSJan Kara 1609884d179dSJan Kara /* 1610fd8fbfc1SDmitry Monakhov * inode_reserved_space is managed internally by quota, and protected by 1611fd8fbfc1SDmitry Monakhov * i_lock similar to i_blocks+i_bytes. 1612fd8fbfc1SDmitry Monakhov */ 1613fd8fbfc1SDmitry Monakhov static qsize_t *inode_reserved_space(struct inode * inode) 1614fd8fbfc1SDmitry Monakhov { 1615fd8fbfc1SDmitry Monakhov /* Filesystem must explicitly define it's own method in order to use 1616fd8fbfc1SDmitry Monakhov * quota reservation interface */ 1617fd8fbfc1SDmitry Monakhov BUG_ON(!inode->i_sb->dq_op->get_reserved_space); 1618fd8fbfc1SDmitry Monakhov return inode->i_sb->dq_op->get_reserved_space(inode); 1619fd8fbfc1SDmitry Monakhov } 1620fd8fbfc1SDmitry Monakhov 16217b9ca4c6SJan Kara static qsize_t __inode_get_rsv_space(struct inode *inode) 1622fd8fbfc1SDmitry Monakhov { 16237b9ca4c6SJan Kara if (!inode->i_sb->dq_op->get_reserved_space) 16247b9ca4c6SJan Kara return 0; 16257b9ca4c6SJan Kara return *inode_reserved_space(inode); 1626fd8fbfc1SDmitry Monakhov } 1627fd8fbfc1SDmitry Monakhov 1628fd8fbfc1SDmitry Monakhov static qsize_t inode_get_rsv_space(struct inode *inode) 1629fd8fbfc1SDmitry Monakhov { 1630fd8fbfc1SDmitry Monakhov qsize_t ret; 163105b5d898SJan Kara 163205b5d898SJan Kara if (!inode->i_sb->dq_op->get_reserved_space) 163305b5d898SJan Kara return 0; 1634fd8fbfc1SDmitry Monakhov spin_lock(&inode->i_lock); 16357b9ca4c6SJan Kara ret = __inode_get_rsv_space(inode); 1636fd8fbfc1SDmitry Monakhov spin_unlock(&inode->i_lock); 1637fd8fbfc1SDmitry Monakhov return ret; 1638fd8fbfc1SDmitry Monakhov } 1639fd8fbfc1SDmitry Monakhov 1640fd8fbfc1SDmitry Monakhov /* 16415dd4056dSChristoph Hellwig * This functions updates i_blocks+i_bytes fields and quota information 16425dd4056dSChristoph Hellwig * (together with appropriate checks). 16435dd4056dSChristoph Hellwig * 16445dd4056dSChristoph Hellwig * NOTE: We absolutely rely on the fact that caller dirties the inode 16455dd4056dSChristoph Hellwig * (usually helpers in quotaops.h care about this) and holds a handle for 16465dd4056dSChristoph Hellwig * the current transaction so that dquot write and inode write go into the 16475dd4056dSChristoph Hellwig * same transaction. 1648884d179dSJan Kara */ 1649884d179dSJan Kara 1650884d179dSJan Kara /* 1651884d179dSJan Kara * This operation can block, but only after everything is updated 1652884d179dSJan Kara */ 165356246f9aSEric Sandeen int __dquot_alloc_space(struct inode *inode, qsize_t number, int flags) 1654884d179dSJan Kara { 1655b9ba6f94SNiu Yawei int cnt, ret = 0, index; 1656bf097aafSJan Kara struct dquot_warn warn[MAXQUOTAS]; 165756246f9aSEric Sandeen int reserve = flags & DQUOT_SPACE_RESERVE; 16585bcd3b6fSKonstantin Khlebnikov struct dquot **dquots; 1659884d179dSJan Kara 1660189eef59SChristoph Hellwig if (!dquot_active(inode)) { 1661a478e522SJan Kara if (reserve) { 1662a478e522SJan Kara spin_lock(&inode->i_lock); 1663a478e522SJan Kara *inode_reserved_space(inode) += number; 1664a478e522SJan Kara spin_unlock(&inode->i_lock); 1665a478e522SJan Kara } else { 1666a478e522SJan Kara inode_add_bytes(inode, number); 1667a478e522SJan Kara } 1668fd8fbfc1SDmitry Monakhov goto out; 1669fd8fbfc1SDmitry Monakhov } 1670fd8fbfc1SDmitry Monakhov 1671884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 1672bf097aafSJan Kara warn[cnt].w_type = QUOTA_NL_NOWARN; 1673884d179dSJan Kara 16745bcd3b6fSKonstantin Khlebnikov dquots = i_dquot(inode); 1675b9ba6f94SNiu Yawei index = srcu_read_lock(&dquot_srcu); 16767b9ca4c6SJan Kara spin_lock(&inode->i_lock); 1677884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1678bf097aafSJan Kara if (!dquots[cnt]) 1679884d179dSJan Kara continue; 1680df15a2a5SChengguang Xu if (reserve) { 16817b9ca4c6SJan Kara ret = dquot_add_space(dquots[cnt], 0, number, flags, 16827b9ca4c6SJan Kara &warn[cnt]); 16837b9ca4c6SJan Kara } else { 16847b9ca4c6SJan Kara ret = dquot_add_space(dquots[cnt], number, 0, flags, 16857b9ca4c6SJan Kara &warn[cnt]); 16867b9ca4c6SJan Kara } 16877b9ca4c6SJan Kara if (ret) { 16887b9ca4c6SJan Kara /* Back out changes we already did */ 16897b9ca4c6SJan Kara for (cnt--; cnt >= 0; cnt--) { 16907b9ca4c6SJan Kara if (!dquots[cnt]) 16917b9ca4c6SJan Kara continue; 16927b9ca4c6SJan Kara spin_lock(&dquots[cnt]->dq_dqb_lock); 1693632a9f3aSChengguang Xu if (reserve) 1694632a9f3aSChengguang Xu dquot_free_reserved_space(dquots[cnt], 1695632a9f3aSChengguang Xu number); 1696632a9f3aSChengguang Xu else 1697632a9f3aSChengguang Xu dquot_decr_space(dquots[cnt], number); 16987b9ca4c6SJan Kara spin_unlock(&dquots[cnt]->dq_dqb_lock); 16997b9ca4c6SJan Kara } 17007b9ca4c6SJan Kara spin_unlock(&inode->i_lock); 1701fd8fbfc1SDmitry Monakhov goto out_flush_warn; 1702884d179dSJan Kara } 1703884d179dSJan Kara } 1704884d179dSJan Kara if (reserve) 1705a478e522SJan Kara *inode_reserved_space(inode) += number; 1706884d179dSJan Kara else 17077b9ca4c6SJan Kara __inode_add_bytes(inode, number); 1708a478e522SJan Kara spin_unlock(&inode->i_lock); 1709fd8fbfc1SDmitry Monakhov 1710fd8fbfc1SDmitry Monakhov if (reserve) 1711fd8fbfc1SDmitry Monakhov goto out_flush_warn; 1712bf097aafSJan Kara mark_all_dquot_dirty(dquots); 1713fd8fbfc1SDmitry Monakhov out_flush_warn: 1714b9ba6f94SNiu Yawei srcu_read_unlock(&dquot_srcu, index); 1715bf097aafSJan Kara flush_warnings(warn); 1716fd8fbfc1SDmitry Monakhov out: 1717884d179dSJan Kara return ret; 1718884d179dSJan Kara } 17195dd4056dSChristoph Hellwig EXPORT_SYMBOL(__dquot_alloc_space); 1720884d179dSJan Kara 1721884d179dSJan Kara /* 1722884d179dSJan Kara * This operation can block, but only after everything is updated 1723884d179dSJan Kara */ 17246bab3596SJan Kara int dquot_alloc_inode(struct inode *inode) 1725884d179dSJan Kara { 1726b9ba6f94SNiu Yawei int cnt, ret = 0, index; 1727bf097aafSJan Kara struct dquot_warn warn[MAXQUOTAS]; 17285bcd3b6fSKonstantin Khlebnikov struct dquot * const *dquots; 1729884d179dSJan Kara 1730189eef59SChristoph Hellwig if (!dquot_active(inode)) 173163936ddaSChristoph Hellwig return 0; 1732884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 1733bf097aafSJan Kara warn[cnt].w_type = QUOTA_NL_NOWARN; 1734b9ba6f94SNiu Yawei 17355bcd3b6fSKonstantin Khlebnikov dquots = i_dquot(inode); 1736b9ba6f94SNiu Yawei index = srcu_read_lock(&dquot_srcu); 17377b9ca4c6SJan Kara spin_lock(&inode->i_lock); 1738884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1739bf097aafSJan Kara if (!dquots[cnt]) 1740884d179dSJan Kara continue; 17417b9ca4c6SJan Kara ret = dquot_add_inodes(dquots[cnt], 1, &warn[cnt]); 17427b9ca4c6SJan Kara if (ret) { 17437b9ca4c6SJan Kara for (cnt--; cnt >= 0; cnt--) { 17447b9ca4c6SJan Kara if (!dquots[cnt]) 17457b9ca4c6SJan Kara continue; 17467b9ca4c6SJan Kara /* Back out changes we already did */ 17477b9ca4c6SJan Kara spin_lock(&dquots[cnt]->dq_dqb_lock); 1748632a9f3aSChengguang Xu dquot_decr_inodes(dquots[cnt], 1); 17497b9ca4c6SJan Kara spin_unlock(&dquots[cnt]->dq_dqb_lock); 17507b9ca4c6SJan Kara } 1751884d179dSJan Kara goto warn_put_all; 1752884d179dSJan Kara } 1753884d179dSJan Kara } 1754efd8f0e6SChristoph Hellwig 1755884d179dSJan Kara warn_put_all: 17567b9ca4c6SJan Kara spin_unlock(&inode->i_lock); 175763936ddaSChristoph Hellwig if (ret == 0) 1758bf097aafSJan Kara mark_all_dquot_dirty(dquots); 1759b9ba6f94SNiu Yawei srcu_read_unlock(&dquot_srcu, index); 1760bf097aafSJan Kara flush_warnings(warn); 1761884d179dSJan Kara return ret; 1762884d179dSJan Kara } 1763884d179dSJan Kara EXPORT_SYMBOL(dquot_alloc_inode); 1764884d179dSJan Kara 17655dd4056dSChristoph Hellwig /* 17665dd4056dSChristoph Hellwig * Convert in-memory reserved quotas to real consumed quotas 17675dd4056dSChristoph Hellwig */ 17685dd4056dSChristoph Hellwig int dquot_claim_space_nodirty(struct inode *inode, qsize_t number) 1769884d179dSJan Kara { 17705bcd3b6fSKonstantin Khlebnikov struct dquot **dquots; 1771b9ba6f94SNiu Yawei int cnt, index; 1772884d179dSJan Kara 1773189eef59SChristoph Hellwig if (!dquot_active(inode)) { 17740ed60de3SJan Kara spin_lock(&inode->i_lock); 17750ed60de3SJan Kara *inode_reserved_space(inode) -= number; 17760ed60de3SJan Kara __inode_add_bytes(inode, number); 17770ed60de3SJan Kara spin_unlock(&inode->i_lock); 17785dd4056dSChristoph Hellwig return 0; 1779884d179dSJan Kara } 1780884d179dSJan Kara 17815bcd3b6fSKonstantin Khlebnikov dquots = i_dquot(inode); 1782b9ba6f94SNiu Yawei index = srcu_read_lock(&dquot_srcu); 17837b9ca4c6SJan Kara spin_lock(&inode->i_lock); 1784884d179dSJan Kara /* Claim reserved quotas to allocated quotas */ 1785884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 17863ab167d2SJan Kara if (dquots[cnt]) { 17873ab167d2SJan Kara struct dquot *dquot = dquots[cnt]; 17883ab167d2SJan Kara 17897b9ca4c6SJan Kara spin_lock(&dquot->dq_dqb_lock); 17903ab167d2SJan Kara if (WARN_ON_ONCE(dquot->dq_dqb.dqb_rsvspace < number)) 17913ab167d2SJan Kara number = dquot->dq_dqb.dqb_rsvspace; 17923ab167d2SJan Kara dquot->dq_dqb.dqb_curspace += number; 17933ab167d2SJan Kara dquot->dq_dqb.dqb_rsvspace -= number; 17947b9ca4c6SJan Kara spin_unlock(&dquot->dq_dqb_lock); 17953ab167d2SJan Kara } 1796884d179dSJan Kara } 1797884d179dSJan Kara /* Update inode bytes */ 17980ed60de3SJan Kara *inode_reserved_space(inode) -= number; 17990ed60de3SJan Kara __inode_add_bytes(inode, number); 18000ed60de3SJan Kara spin_unlock(&inode->i_lock); 18015bcd3b6fSKonstantin Khlebnikov mark_all_dquot_dirty(dquots); 1802b9ba6f94SNiu Yawei srcu_read_unlock(&dquot_srcu, index); 18035dd4056dSChristoph Hellwig return 0; 1804884d179dSJan Kara } 18055dd4056dSChristoph Hellwig EXPORT_SYMBOL(dquot_claim_space_nodirty); 1806884d179dSJan Kara 1807884d179dSJan Kara /* 18081c8924ebSJan Kara * Convert allocated space back to in-memory reserved quotas 18091c8924ebSJan Kara */ 18101c8924ebSJan Kara void dquot_reclaim_space_nodirty(struct inode *inode, qsize_t number) 18111c8924ebSJan Kara { 18125bcd3b6fSKonstantin Khlebnikov struct dquot **dquots; 1813b9ba6f94SNiu Yawei int cnt, index; 18141c8924ebSJan Kara 18151c8924ebSJan Kara if (!dquot_active(inode)) { 18160ed60de3SJan Kara spin_lock(&inode->i_lock); 18170ed60de3SJan Kara *inode_reserved_space(inode) += number; 18180ed60de3SJan Kara __inode_sub_bytes(inode, number); 18190ed60de3SJan Kara spin_unlock(&inode->i_lock); 18201c8924ebSJan Kara return; 18211c8924ebSJan Kara } 18221c8924ebSJan Kara 18235bcd3b6fSKonstantin Khlebnikov dquots = i_dquot(inode); 1824b9ba6f94SNiu Yawei index = srcu_read_lock(&dquot_srcu); 18257b9ca4c6SJan Kara spin_lock(&inode->i_lock); 18261c8924ebSJan Kara /* Claim reserved quotas to allocated quotas */ 18271c8924ebSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 18283ab167d2SJan Kara if (dquots[cnt]) { 18293ab167d2SJan Kara struct dquot *dquot = dquots[cnt]; 18303ab167d2SJan Kara 18317b9ca4c6SJan Kara spin_lock(&dquot->dq_dqb_lock); 18323ab167d2SJan Kara if (WARN_ON_ONCE(dquot->dq_dqb.dqb_curspace < number)) 18333ab167d2SJan Kara number = dquot->dq_dqb.dqb_curspace; 18343ab167d2SJan Kara dquot->dq_dqb.dqb_rsvspace += number; 18353ab167d2SJan Kara dquot->dq_dqb.dqb_curspace -= number; 18367b9ca4c6SJan Kara spin_unlock(&dquot->dq_dqb_lock); 18373ab167d2SJan Kara } 18381c8924ebSJan Kara } 18391c8924ebSJan Kara /* Update inode bytes */ 18400ed60de3SJan Kara *inode_reserved_space(inode) += number; 18410ed60de3SJan Kara __inode_sub_bytes(inode, number); 18420ed60de3SJan Kara spin_unlock(&inode->i_lock); 18435bcd3b6fSKonstantin Khlebnikov mark_all_dquot_dirty(dquots); 1844b9ba6f94SNiu Yawei srcu_read_unlock(&dquot_srcu, index); 18451c8924ebSJan Kara return; 18461c8924ebSJan Kara } 18471c8924ebSJan Kara EXPORT_SYMBOL(dquot_reclaim_space_nodirty); 18481c8924ebSJan Kara 18491c8924ebSJan Kara /* 1850884d179dSJan Kara * This operation can block, but only after everything is updated 1851884d179dSJan Kara */ 185256246f9aSEric Sandeen void __dquot_free_space(struct inode *inode, qsize_t number, int flags) 1853884d179dSJan Kara { 1854884d179dSJan Kara unsigned int cnt; 1855bf097aafSJan Kara struct dquot_warn warn[MAXQUOTAS]; 18565bcd3b6fSKonstantin Khlebnikov struct dquot **dquots; 1857b9ba6f94SNiu Yawei int reserve = flags & DQUOT_SPACE_RESERVE, index; 1858884d179dSJan Kara 1859189eef59SChristoph Hellwig if (!dquot_active(inode)) { 1860a478e522SJan Kara if (reserve) { 1861a478e522SJan Kara spin_lock(&inode->i_lock); 1862a478e522SJan Kara *inode_reserved_space(inode) -= number; 1863a478e522SJan Kara spin_unlock(&inode->i_lock); 1864a478e522SJan Kara } else { 1865a478e522SJan Kara inode_sub_bytes(inode, number); 1866a478e522SJan Kara } 18675dd4056dSChristoph Hellwig return; 1868884d179dSJan Kara } 1869884d179dSJan Kara 18705bcd3b6fSKonstantin Khlebnikov dquots = i_dquot(inode); 1871b9ba6f94SNiu Yawei index = srcu_read_lock(&dquot_srcu); 18727b9ca4c6SJan Kara spin_lock(&inode->i_lock); 1873884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1874bf097aafSJan Kara int wtype; 1875bf097aafSJan Kara 1876bf097aafSJan Kara warn[cnt].w_type = QUOTA_NL_NOWARN; 1877bf097aafSJan Kara if (!dquots[cnt]) 1878884d179dSJan Kara continue; 18797b9ca4c6SJan Kara spin_lock(&dquots[cnt]->dq_dqb_lock); 1880bf097aafSJan Kara wtype = info_bdq_free(dquots[cnt], number); 1881bf097aafSJan Kara if (wtype != QUOTA_NL_NOWARN) 1882bf097aafSJan Kara prepare_warning(&warn[cnt], dquots[cnt], wtype); 1883fd8fbfc1SDmitry Monakhov if (reserve) 1884bf097aafSJan Kara dquot_free_reserved_space(dquots[cnt], number); 1885fd8fbfc1SDmitry Monakhov else 1886bf097aafSJan Kara dquot_decr_space(dquots[cnt], number); 18877b9ca4c6SJan Kara spin_unlock(&dquots[cnt]->dq_dqb_lock); 1888884d179dSJan Kara } 18897b9ca4c6SJan Kara if (reserve) 1890a478e522SJan Kara *inode_reserved_space(inode) -= number; 18917b9ca4c6SJan Kara else 18927b9ca4c6SJan Kara __inode_sub_bytes(inode, number); 1893a478e522SJan Kara spin_unlock(&inode->i_lock); 1894fd8fbfc1SDmitry Monakhov 1895fd8fbfc1SDmitry Monakhov if (reserve) 1896fd8fbfc1SDmitry Monakhov goto out_unlock; 1897bf097aafSJan Kara mark_all_dquot_dirty(dquots); 1898fd8fbfc1SDmitry Monakhov out_unlock: 1899b9ba6f94SNiu Yawei srcu_read_unlock(&dquot_srcu, index); 1900bf097aafSJan Kara flush_warnings(warn); 1901884d179dSJan Kara } 19025dd4056dSChristoph Hellwig EXPORT_SYMBOL(__dquot_free_space); 1903fd8fbfc1SDmitry Monakhov 1904fd8fbfc1SDmitry Monakhov /* 1905884d179dSJan Kara * This operation can block, but only after everything is updated 1906884d179dSJan Kara */ 19076bab3596SJan Kara void dquot_free_inode(struct inode *inode) 1908884d179dSJan Kara { 1909884d179dSJan Kara unsigned int cnt; 1910bf097aafSJan Kara struct dquot_warn warn[MAXQUOTAS]; 19115bcd3b6fSKonstantin Khlebnikov struct dquot * const *dquots; 1912b9ba6f94SNiu Yawei int index; 1913884d179dSJan Kara 1914189eef59SChristoph Hellwig if (!dquot_active(inode)) 191563936ddaSChristoph Hellwig return; 1916884d179dSJan Kara 19175bcd3b6fSKonstantin Khlebnikov dquots = i_dquot(inode); 1918b9ba6f94SNiu Yawei index = srcu_read_lock(&dquot_srcu); 19197b9ca4c6SJan Kara spin_lock(&inode->i_lock); 1920884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1921bf097aafSJan Kara int wtype; 1922bf097aafSJan Kara 1923bf097aafSJan Kara warn[cnt].w_type = QUOTA_NL_NOWARN; 1924bf097aafSJan Kara if (!dquots[cnt]) 1925884d179dSJan Kara continue; 19267b9ca4c6SJan Kara spin_lock(&dquots[cnt]->dq_dqb_lock); 1927bf097aafSJan Kara wtype = info_idq_free(dquots[cnt], 1); 1928bf097aafSJan Kara if (wtype != QUOTA_NL_NOWARN) 1929bf097aafSJan Kara prepare_warning(&warn[cnt], dquots[cnt], wtype); 1930bf097aafSJan Kara dquot_decr_inodes(dquots[cnt], 1); 19317b9ca4c6SJan Kara spin_unlock(&dquots[cnt]->dq_dqb_lock); 1932884d179dSJan Kara } 19337b9ca4c6SJan Kara spin_unlock(&inode->i_lock); 1934bf097aafSJan Kara mark_all_dquot_dirty(dquots); 1935b9ba6f94SNiu Yawei srcu_read_unlock(&dquot_srcu, index); 1936bf097aafSJan Kara flush_warnings(warn); 1937884d179dSJan Kara } 1938884d179dSJan Kara EXPORT_SYMBOL(dquot_free_inode); 1939884d179dSJan Kara 1940884d179dSJan Kara /* 1941884d179dSJan Kara * Transfer the number of inode and blocks from one diskquota to an other. 1942bc8e5f07SJan Kara * On success, dquot references in transfer_to are consumed and references 1943bc8e5f07SJan Kara * to original dquots that need to be released are placed there. On failure, 1944bc8e5f07SJan Kara * references are kept untouched. 1945884d179dSJan Kara * 1946884d179dSJan Kara * This operation can block, but only after everything is updated 1947884d179dSJan Kara * A transaction must be started when entering this function. 1948bc8e5f07SJan Kara * 1949b9ba6f94SNiu Yawei * We are holding reference on transfer_from & transfer_to, no need to 1950b9ba6f94SNiu Yawei * protect them by srcu_read_lock(). 1951884d179dSJan Kara */ 1952bc8e5f07SJan Kara int __dquot_transfer(struct inode *inode, struct dquot **transfer_to) 1953884d179dSJan Kara { 19547b9ca4c6SJan Kara qsize_t cur_space; 1955884d179dSJan Kara qsize_t rsv_space = 0; 19567a9ca53aSTahsin Erdogan qsize_t inode_usage = 1; 1957bc8e5f07SJan Kara struct dquot *transfer_from[MAXQUOTAS] = {}; 1958efd8f0e6SChristoph Hellwig int cnt, ret = 0; 19599e32784bSDmitry char is_valid[MAXQUOTAS] = {}; 1960bf097aafSJan Kara struct dquot_warn warn_to[MAXQUOTAS]; 1961bf097aafSJan Kara struct dquot_warn warn_from_inodes[MAXQUOTAS]; 1962bf097aafSJan Kara struct dquot_warn warn_from_space[MAXQUOTAS]; 1963884d179dSJan Kara 1964884d179dSJan Kara if (IS_NOQUOTA(inode)) 1965efd8f0e6SChristoph Hellwig return 0; 19667a9ca53aSTahsin Erdogan 19677a9ca53aSTahsin Erdogan if (inode->i_sb->dq_op->get_inode_usage) { 19687a9ca53aSTahsin Erdogan ret = inode->i_sb->dq_op->get_inode_usage(inode, &inode_usage); 19697a9ca53aSTahsin Erdogan if (ret) 19707a9ca53aSTahsin Erdogan return ret; 19717a9ca53aSTahsin Erdogan } 19727a9ca53aSTahsin Erdogan 1973884d179dSJan Kara /* Initialize the arrays */ 1974bf097aafSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1975bf097aafSJan Kara warn_to[cnt].w_type = QUOTA_NL_NOWARN; 1976bf097aafSJan Kara warn_from_inodes[cnt].w_type = QUOTA_NL_NOWARN; 1977bf097aafSJan Kara warn_from_space[cnt].w_type = QUOTA_NL_NOWARN; 1978bf097aafSJan Kara } 1979b9ba6f94SNiu Yawei 1980b9ba6f94SNiu Yawei spin_lock(&dq_data_lock); 19817b9ca4c6SJan Kara spin_lock(&inode->i_lock); 1982884d179dSJan Kara if (IS_NOQUOTA(inode)) { /* File without quota accounting? */ 19837b9ca4c6SJan Kara spin_unlock(&inode->i_lock); 1984b9ba6f94SNiu Yawei spin_unlock(&dq_data_lock); 1985bc8e5f07SJan Kara return 0; 1986884d179dSJan Kara } 19877b9ca4c6SJan Kara cur_space = __inode_get_bytes(inode); 19887b9ca4c6SJan Kara rsv_space = __inode_get_rsv_space(inode); 19897b9ca4c6SJan Kara /* 19907b9ca4c6SJan Kara * Build the transfer_from list, check limits, and update usage in 19917b9ca4c6SJan Kara * the target structures. 19927b9ca4c6SJan Kara */ 1993884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 19949e32784bSDmitry /* 19959e32784bSDmitry * Skip changes for same uid or gid or for turned off quota-type. 19969e32784bSDmitry */ 1997dd6f3c6dSJan Kara if (!transfer_to[cnt]) 1998884d179dSJan Kara continue; 19999e32784bSDmitry /* Avoid races with quotaoff() */ 20009e32784bSDmitry if (!sb_has_quota_active(inode->i_sb, cnt)) 20019e32784bSDmitry continue; 20029e32784bSDmitry is_valid[cnt] = 1; 20032d0fa467SJan Kara transfer_from[cnt] = i_dquot(inode)[cnt]; 20047b9ca4c6SJan Kara ret = dquot_add_inodes(transfer_to[cnt], inode_usage, 20057b9ca4c6SJan Kara &warn_to[cnt]); 2006efd8f0e6SChristoph Hellwig if (ret) 2007efd8f0e6SChristoph Hellwig goto over_quota; 2008c6d9c35dSyangerkun ret = dquot_add_space(transfer_to[cnt], cur_space, rsv_space, 2009c6d9c35dSyangerkun DQUOT_SPACE_WARN, &warn_to[cnt]); 20107b9ca4c6SJan Kara if (ret) { 20110a51fb71SKonstantin Khlebnikov spin_lock(&transfer_to[cnt]->dq_dqb_lock); 20127b9ca4c6SJan Kara dquot_decr_inodes(transfer_to[cnt], inode_usage); 20130a51fb71SKonstantin Khlebnikov spin_unlock(&transfer_to[cnt]->dq_dqb_lock); 2014884d179dSJan Kara goto over_quota; 2015884d179dSJan Kara } 20167b9ca4c6SJan Kara } 2017884d179dSJan Kara 20187b9ca4c6SJan Kara /* Decrease usage for source structures and update quota pointers */ 2019884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 20209e32784bSDmitry if (!is_valid[cnt]) 2021884d179dSJan Kara continue; 2022884d179dSJan Kara /* Due to IO error we might not have transfer_from[] structure */ 2023884d179dSJan Kara if (transfer_from[cnt]) { 2024bf097aafSJan Kara int wtype; 20257b9ca4c6SJan Kara 20267b9ca4c6SJan Kara spin_lock(&transfer_from[cnt]->dq_dqb_lock); 20277a9ca53aSTahsin Erdogan wtype = info_idq_free(transfer_from[cnt], inode_usage); 2028bf097aafSJan Kara if (wtype != QUOTA_NL_NOWARN) 2029bf097aafSJan Kara prepare_warning(&warn_from_inodes[cnt], 2030bf097aafSJan Kara transfer_from[cnt], wtype); 20317b9ca4c6SJan Kara wtype = info_bdq_free(transfer_from[cnt], 20327b9ca4c6SJan Kara cur_space + rsv_space); 2033bf097aafSJan Kara if (wtype != QUOTA_NL_NOWARN) 2034bf097aafSJan Kara prepare_warning(&warn_from_space[cnt], 2035bf097aafSJan Kara transfer_from[cnt], wtype); 20367a9ca53aSTahsin Erdogan dquot_decr_inodes(transfer_from[cnt], inode_usage); 2037884d179dSJan Kara dquot_decr_space(transfer_from[cnt], cur_space); 2038884d179dSJan Kara dquot_free_reserved_space(transfer_from[cnt], 2039884d179dSJan Kara rsv_space); 20407b9ca4c6SJan Kara spin_unlock(&transfer_from[cnt]->dq_dqb_lock); 2041884d179dSJan Kara } 20422d0fa467SJan Kara i_dquot(inode)[cnt] = transfer_to[cnt]; 2043884d179dSJan Kara } 20447b9ca4c6SJan Kara spin_unlock(&inode->i_lock); 2045884d179dSJan Kara spin_unlock(&dq_data_lock); 2046884d179dSJan Kara 2047dc52dd3aSDmitry Monakhov mark_all_dquot_dirty(transfer_from); 2048dc52dd3aSDmitry Monakhov mark_all_dquot_dirty(transfer_to); 2049bf097aafSJan Kara flush_warnings(warn_to); 2050bf097aafSJan Kara flush_warnings(warn_from_inodes); 2051bf097aafSJan Kara flush_warnings(warn_from_space); 2052bc8e5f07SJan Kara /* Pass back references to put */ 2053dc52dd3aSDmitry Monakhov for (cnt = 0; cnt < MAXQUOTAS; cnt++) 20549e32784bSDmitry if (is_valid[cnt]) 2055bc8e5f07SJan Kara transfer_to[cnt] = transfer_from[cnt]; 205686f3cbecSJan Kara return 0; 2057884d179dSJan Kara over_quota: 20587b9ca4c6SJan Kara /* Back out changes we already did */ 20597b9ca4c6SJan Kara for (cnt--; cnt >= 0; cnt--) { 20607b9ca4c6SJan Kara if (!is_valid[cnt]) 20617b9ca4c6SJan Kara continue; 20627b9ca4c6SJan Kara spin_lock(&transfer_to[cnt]->dq_dqb_lock); 20637b9ca4c6SJan Kara dquot_decr_inodes(transfer_to[cnt], inode_usage); 20647b9ca4c6SJan Kara dquot_decr_space(transfer_to[cnt], cur_space); 20657b9ca4c6SJan Kara dquot_free_reserved_space(transfer_to[cnt], rsv_space); 20667b9ca4c6SJan Kara spin_unlock(&transfer_to[cnt]->dq_dqb_lock); 20677b9ca4c6SJan Kara } 20687b9ca4c6SJan Kara spin_unlock(&inode->i_lock); 2069884d179dSJan Kara spin_unlock(&dq_data_lock); 2070bf097aafSJan Kara flush_warnings(warn_to); 207186f3cbecSJan Kara return ret; 2072884d179dSJan Kara } 2073bc8e5f07SJan Kara EXPORT_SYMBOL(__dquot_transfer); 2074884d179dSJan Kara 20758ddd69d6SDmitry Monakhov /* Wrapper for transferring ownership of an inode for uid/gid only 20768ddd69d6SDmitry Monakhov * Called from FSXXX_setattr() 20778ddd69d6SDmitry Monakhov */ 2078b43fa828SChristoph Hellwig int dquot_transfer(struct inode *inode, struct iattr *iattr) 2079884d179dSJan Kara { 2080bc8e5f07SJan Kara struct dquot *transfer_to[MAXQUOTAS] = {}; 20816184fc0bSJan Kara struct dquot *dquot; 2082bc8e5f07SJan Kara struct super_block *sb = inode->i_sb; 2083bc8e5f07SJan Kara int ret; 20848ddd69d6SDmitry Monakhov 2085189eef59SChristoph Hellwig if (!dquot_active(inode)) 2086884d179dSJan Kara return 0; 2087bc8e5f07SJan Kara 20886184fc0bSJan Kara if (iattr->ia_valid & ATTR_UID && !uid_eq(iattr->ia_uid, inode->i_uid)){ 20896184fc0bSJan Kara dquot = dqget(sb, make_kqid_uid(iattr->ia_uid)); 20906184fc0bSJan Kara if (IS_ERR(dquot)) { 20916184fc0bSJan Kara if (PTR_ERR(dquot) != -ESRCH) { 20926184fc0bSJan Kara ret = PTR_ERR(dquot); 20936184fc0bSJan Kara goto out_put; 20946184fc0bSJan Kara } 20956184fc0bSJan Kara dquot = NULL; 20966184fc0bSJan Kara } 20976184fc0bSJan Kara transfer_to[USRQUOTA] = dquot; 20986184fc0bSJan Kara } 20996184fc0bSJan Kara if (iattr->ia_valid & ATTR_GID && !gid_eq(iattr->ia_gid, inode->i_gid)){ 21006184fc0bSJan Kara dquot = dqget(sb, make_kqid_gid(iattr->ia_gid)); 21016184fc0bSJan Kara if (IS_ERR(dquot)) { 21026184fc0bSJan Kara if (PTR_ERR(dquot) != -ESRCH) { 21036184fc0bSJan Kara ret = PTR_ERR(dquot); 21046184fc0bSJan Kara goto out_put; 21056184fc0bSJan Kara } 21066184fc0bSJan Kara dquot = NULL; 21076184fc0bSJan Kara } 21086184fc0bSJan Kara transfer_to[GRPQUOTA] = dquot; 21096184fc0bSJan Kara } 2110bc8e5f07SJan Kara ret = __dquot_transfer(inode, transfer_to); 21116184fc0bSJan Kara out_put: 2112bc8e5f07SJan Kara dqput_all(transfer_to); 2113bc8e5f07SJan Kara return ret; 2114884d179dSJan Kara } 2115b43fa828SChristoph Hellwig EXPORT_SYMBOL(dquot_transfer); 2116884d179dSJan Kara 2117884d179dSJan Kara /* 2118884d179dSJan Kara * Write info of quota file to disk 2119884d179dSJan Kara */ 2120884d179dSJan Kara int dquot_commit_info(struct super_block *sb, int type) 2121884d179dSJan Kara { 2122884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 2123884d179dSJan Kara 21249a8ae30eSJan Kara return dqopt->ops[type]->write_file_info(sb, type); 2125884d179dSJan Kara } 2126884d179dSJan Kara EXPORT_SYMBOL(dquot_commit_info); 2127884d179dSJan Kara 2128be6257b2SJan Kara int dquot_get_next_id(struct super_block *sb, struct kqid *qid) 2129be6257b2SJan Kara { 2130be6257b2SJan Kara struct quota_info *dqopt = sb_dqopt(sb); 2131be6257b2SJan Kara 21329d1ccbe7SJan Kara if (!sb_has_quota_active(sb, qid->type)) 21339d1ccbe7SJan Kara return -ESRCH; 21349d1ccbe7SJan Kara if (!dqopt->ops[qid->type]->get_next_id) 21359d1ccbe7SJan Kara return -ENOSYS; 2136f14618c6SJan Kara return dqopt->ops[qid->type]->get_next_id(sb, qid); 2137be6257b2SJan Kara } 2138be6257b2SJan Kara EXPORT_SYMBOL(dquot_get_next_id); 2139be6257b2SJan Kara 2140884d179dSJan Kara /* 2141884d179dSJan Kara * Definitions of diskquota operations. 2142884d179dSJan Kara */ 214361e225dcSAlexey Dobriyan const struct dquot_operations dquot_operations = { 2144884d179dSJan Kara .write_dquot = dquot_commit, 2145884d179dSJan Kara .acquire_dquot = dquot_acquire, 2146884d179dSJan Kara .release_dquot = dquot_release, 2147884d179dSJan Kara .mark_dirty = dquot_mark_dquot_dirty, 2148884d179dSJan Kara .write_info = dquot_commit_info, 2149884d179dSJan Kara .alloc_dquot = dquot_alloc, 2150884d179dSJan Kara .destroy_dquot = dquot_destroy, 2151be6257b2SJan Kara .get_next_id = dquot_get_next_id, 2152884d179dSJan Kara }; 2153123e9cafSChristoph Hellwig EXPORT_SYMBOL(dquot_operations); 2154884d179dSJan Kara 2155884d179dSJan Kara /* 2156907f4554SChristoph Hellwig * Generic helper for ->open on filesystems supporting disk quotas. 2157907f4554SChristoph Hellwig */ 2158907f4554SChristoph Hellwig int dquot_file_open(struct inode *inode, struct file *file) 2159907f4554SChristoph Hellwig { 2160907f4554SChristoph Hellwig int error; 2161907f4554SChristoph Hellwig 2162907f4554SChristoph Hellwig error = generic_file_open(inode, file); 2163907f4554SChristoph Hellwig if (!error && (file->f_mode & FMODE_WRITE)) 216488d8ff97SChao Yu error = dquot_initialize(inode); 2165907f4554SChristoph Hellwig return error; 2166907f4554SChristoph Hellwig } 2167907f4554SChristoph Hellwig EXPORT_SYMBOL(dquot_file_open); 2168907f4554SChristoph Hellwig 21692ec1f301SJan Kara static void vfs_cleanup_quota_inode(struct super_block *sb, int type) 21702ec1f301SJan Kara { 21712ec1f301SJan Kara struct quota_info *dqopt = sb_dqopt(sb); 21722ec1f301SJan Kara struct inode *inode = dqopt->files[type]; 21732ec1f301SJan Kara 21742ec1f301SJan Kara if (!inode) 21752ec1f301SJan Kara return; 21762ec1f301SJan Kara if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) { 21772ec1f301SJan Kara inode_lock(inode); 21782ec1f301SJan Kara inode->i_flags &= ~S_NOQUOTA; 21792ec1f301SJan Kara inode_unlock(inode); 21802ec1f301SJan Kara } 21812ec1f301SJan Kara dqopt->files[type] = NULL; 21822ec1f301SJan Kara iput(inode); 21832ec1f301SJan Kara } 21842ec1f301SJan Kara 2185907f4554SChristoph Hellwig /* 2186884d179dSJan Kara * Turn quota off on a device. type == -1 ==> quotaoff for all types (umount) 2187884d179dSJan Kara */ 21880f0dd62fSChristoph Hellwig int dquot_disable(struct super_block *sb, int type, unsigned int flags) 2189884d179dSJan Kara { 21902ec1f301SJan Kara int cnt; 2191884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 2192884d179dSJan Kara 21937d6cd73dSJan Kara /* s_umount should be held in exclusive mode */ 21947d6cd73dSJan Kara if (WARN_ON_ONCE(down_read_trylock(&sb->s_umount))) 21957d6cd73dSJan Kara up_read(&sb->s_umount); 21967d6cd73dSJan Kara 2197884d179dSJan Kara /* Cannot turn off usage accounting without turning off limits, or 2198884d179dSJan Kara * suspend quotas and simultaneously turn quotas off. */ 2199884d179dSJan Kara if ((flags & DQUOT_USAGE_ENABLED && !(flags & DQUOT_LIMITS_ENABLED)) 2200884d179dSJan Kara || (flags & DQUOT_SUSPENDED && flags & (DQUOT_LIMITS_ENABLED | 2201884d179dSJan Kara DQUOT_USAGE_ENABLED))) 2202884d179dSJan Kara return -EINVAL; 2203884d179dSJan Kara 2204884d179dSJan Kara /* 2205884d179dSJan Kara * Skip everything if there's nothing to do. We have to do this because 2206884d179dSJan Kara * sometimes we are called when fill_super() failed and calling 2207884d179dSJan Kara * sync_fs() in such cases does no good. 2208884d179dSJan Kara */ 2209c3b00446SJan Kara if (!sb_any_quota_loaded(sb)) 2210884d179dSJan Kara return 0; 2211c3b00446SJan Kara 2212884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 2213884d179dSJan Kara if (type != -1 && cnt != type) 2214884d179dSJan Kara continue; 2215884d179dSJan Kara if (!sb_has_quota_loaded(sb, cnt)) 2216884d179dSJan Kara continue; 2217884d179dSJan Kara 2218884d179dSJan Kara if (flags & DQUOT_SUSPENDED) { 2219884d179dSJan Kara spin_lock(&dq_state_lock); 2220884d179dSJan Kara dqopt->flags |= 2221884d179dSJan Kara dquot_state_flag(DQUOT_SUSPENDED, cnt); 2222884d179dSJan Kara spin_unlock(&dq_state_lock); 2223884d179dSJan Kara } else { 2224884d179dSJan Kara spin_lock(&dq_state_lock); 2225884d179dSJan Kara dqopt->flags &= ~dquot_state_flag(flags, cnt); 2226884d179dSJan Kara /* Turning off suspended quotas? */ 2227884d179dSJan Kara if (!sb_has_quota_loaded(sb, cnt) && 2228884d179dSJan Kara sb_has_quota_suspended(sb, cnt)) { 2229884d179dSJan Kara dqopt->flags &= ~dquot_state_flag( 2230884d179dSJan Kara DQUOT_SUSPENDED, cnt); 2231884d179dSJan Kara spin_unlock(&dq_state_lock); 22322ec1f301SJan Kara vfs_cleanup_quota_inode(sb, cnt); 2233884d179dSJan Kara continue; 2234884d179dSJan Kara } 2235884d179dSJan Kara spin_unlock(&dq_state_lock); 2236884d179dSJan Kara } 2237884d179dSJan Kara 2238884d179dSJan Kara /* We still have to keep quota loaded? */ 2239884d179dSJan Kara if (sb_has_quota_loaded(sb, cnt) && !(flags & DQUOT_SUSPENDED)) 2240884d179dSJan Kara continue; 2241884d179dSJan Kara 2242884d179dSJan Kara /* Note: these are blocking operations */ 2243884d179dSJan Kara drop_dquot_ref(sb, cnt); 2244884d179dSJan Kara invalidate_dquots(sb, cnt); 2245884d179dSJan Kara /* 2246268157baSJan Kara * Now all dquots should be invalidated, all writes done so we 2247268157baSJan Kara * should be only users of the info. No locks needed. 2248884d179dSJan Kara */ 2249884d179dSJan Kara if (info_dirty(&dqopt->info[cnt])) 2250884d179dSJan Kara sb->dq_op->write_info(sb, cnt); 2251884d179dSJan Kara if (dqopt->ops[cnt]->free_file_info) 2252884d179dSJan Kara dqopt->ops[cnt]->free_file_info(sb, cnt); 2253884d179dSJan Kara put_quota_format(dqopt->info[cnt].dqi_format); 2254884d179dSJan Kara dqopt->info[cnt].dqi_flags = 0; 2255884d179dSJan Kara dqopt->info[cnt].dqi_igrace = 0; 2256884d179dSJan Kara dqopt->info[cnt].dqi_bgrace = 0; 2257884d179dSJan Kara dqopt->ops[cnt] = NULL; 2258884d179dSJan Kara } 2259884d179dSJan Kara 2260884d179dSJan Kara /* Skip syncing and setting flags if quota files are hidden */ 2261884d179dSJan Kara if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) 2262884d179dSJan Kara goto put_inodes; 2263884d179dSJan Kara 2264884d179dSJan Kara /* Sync the superblock so that buffers with quota data are written to 2265884d179dSJan Kara * disk (and so userspace sees correct data afterwards). */ 2266884d179dSJan Kara if (sb->s_op->sync_fs) 2267884d179dSJan Kara sb->s_op->sync_fs(sb, 1); 2268884d179dSJan Kara sync_blockdev(sb->s_bdev); 2269884d179dSJan Kara /* Now the quota files are just ordinary files and we can set the 2270884d179dSJan Kara * inode flags back. Moreover we discard the pagecache so that 2271884d179dSJan Kara * userspace sees the writes we did bypassing the pagecache. We 2272884d179dSJan Kara * must also discard the blockdev buffers so that we see the 2273884d179dSJan Kara * changes done by userspace on the next quotaon() */ 2274884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 22752ec1f301SJan Kara if (!sb_has_quota_loaded(sb, cnt) && dqopt->files[cnt]) { 22762ec1f301SJan Kara inode_lock(dqopt->files[cnt]); 22772ec1f301SJan Kara truncate_inode_pages(&dqopt->files[cnt]->i_data, 0); 22782ec1f301SJan Kara inode_unlock(dqopt->files[cnt]); 2279884d179dSJan Kara } 2280884d179dSJan Kara if (sb->s_bdev) 2281884d179dSJan Kara invalidate_bdev(sb->s_bdev); 2282884d179dSJan Kara put_inodes: 22832ec1f301SJan Kara /* We are done when suspending quotas */ 22842ec1f301SJan Kara if (flags & DQUOT_SUSPENDED) 22852ec1f301SJan Kara return 0; 22862ec1f301SJan Kara 2287884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 22882ec1f301SJan Kara if (!sb_has_quota_loaded(sb, cnt)) 22892ec1f301SJan Kara vfs_cleanup_quota_inode(sb, cnt); 22902ec1f301SJan Kara return 0; 2291884d179dSJan Kara } 22920f0dd62fSChristoph Hellwig EXPORT_SYMBOL(dquot_disable); 2293884d179dSJan Kara 2294287a8095SChristoph Hellwig int dquot_quota_off(struct super_block *sb, int type) 2295884d179dSJan Kara { 22960f0dd62fSChristoph Hellwig return dquot_disable(sb, type, 22970f0dd62fSChristoph Hellwig DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); 2298884d179dSJan Kara } 2299287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_quota_off); 23000f0dd62fSChristoph Hellwig 2301884d179dSJan Kara /* 2302884d179dSJan Kara * Turn quotas on on a device 2303884d179dSJan Kara */ 2304884d179dSJan Kara 2305c7d3d283SJan Kara static int vfs_setup_quota_inode(struct inode *inode, int type) 2306c7d3d283SJan Kara { 2307c7d3d283SJan Kara struct super_block *sb = inode->i_sb; 2308c7d3d283SJan Kara struct quota_info *dqopt = sb_dqopt(sb); 2309c7d3d283SJan Kara 2310c7d3d283SJan Kara if (!S_ISREG(inode->i_mode)) 2311c7d3d283SJan Kara return -EACCES; 2312c7d3d283SJan Kara if (IS_RDONLY(inode)) 2313c7d3d283SJan Kara return -EROFS; 2314c7d3d283SJan Kara if (sb_has_quota_loaded(sb, type)) 2315c7d3d283SJan Kara return -EBUSY; 2316c7d3d283SJan Kara 2317c7d3d283SJan Kara dqopt->files[type] = igrab(inode); 2318c7d3d283SJan Kara if (!dqopt->files[type]) 2319c7d3d283SJan Kara return -EIO; 2320c7d3d283SJan Kara if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) { 2321c7d3d283SJan Kara /* We don't want quota and atime on quota files (deadlocks 2322c7d3d283SJan Kara * possible) Also nobody should write to the file - we use 2323c7d3d283SJan Kara * special IO operations which ignore the immutable bit. */ 2324c7d3d283SJan Kara inode_lock(inode); 2325c7d3d283SJan Kara inode->i_flags |= S_NOQUOTA; 2326c7d3d283SJan Kara inode_unlock(inode); 2327884d179dSJan Kara /* 2328c7d3d283SJan Kara * When S_NOQUOTA is set, remove dquot references as no more 2329c7d3d283SJan Kara * references can be added 2330884d179dSJan Kara */ 2331c7d3d283SJan Kara __dquot_drop(inode); 2332c7d3d283SJan Kara } 2333c7d3d283SJan Kara return 0; 2334c7d3d283SJan Kara } 2335c7d3d283SJan Kara 2336c7d3d283SJan Kara int dquot_load_quota_sb(struct super_block *sb, int type, int format_id, 2337884d179dSJan Kara unsigned int flags) 2338884d179dSJan Kara { 2339884d179dSJan Kara struct quota_format_type *fmt = find_quota_format(format_id); 2340884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 2341884d179dSJan Kara int error; 2342884d179dSJan Kara 2343dc19432aSJan Kara /* Just unsuspend quotas? */ 2344dc19432aSJan Kara BUG_ON(flags & DQUOT_SUSPENDED); 2345dc19432aSJan Kara /* s_umount should be held in exclusive mode */ 2346dc19432aSJan Kara if (WARN_ON_ONCE(down_read_trylock(&sb->s_umount))) 2347dc19432aSJan Kara up_read(&sb->s_umount); 2348dc19432aSJan Kara 2349884d179dSJan Kara if (!fmt) 2350884d179dSJan Kara return -ESRCH; 2351847aac64SLi Xi if (!sb->s_op->quota_write || !sb->s_op->quota_read || 2352847aac64SLi Xi (type == PRJQUOTA && sb->dq_op->get_projid == NULL)) { 2353884d179dSJan Kara error = -EINVAL; 2354884d179dSJan Kara goto out_fmt; 2355884d179dSJan Kara } 23565c004828SEric W. Biederman /* Filesystems outside of init_user_ns not yet supported */ 23575c004828SEric W. Biederman if (sb->s_user_ns != &init_user_ns) { 23585c004828SEric W. Biederman error = -EINVAL; 23595c004828SEric W. Biederman goto out_fmt; 23605c004828SEric W. Biederman } 2361884d179dSJan Kara /* Usage always has to be set... */ 2362884d179dSJan Kara if (!(flags & DQUOT_USAGE_ENABLED)) { 2363884d179dSJan Kara error = -EINVAL; 2364884d179dSJan Kara goto out_fmt; 2365884d179dSJan Kara } 2366c3b00446SJan Kara if (sb_has_quota_loaded(sb, type)) { 2367c3b00446SJan Kara error = -EBUSY; 2368c3b00446SJan Kara goto out_fmt; 2369c3b00446SJan Kara } 2370884d179dSJan Kara 2371884d179dSJan Kara if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) { 2372ab94c39bSJan Kara /* As we bypass the pagecache we must now flush all the 2373ab94c39bSJan Kara * dirty data and invalidate caches so that kernel sees 2374ab94c39bSJan Kara * changes from userspace. It is not enough to just flush 2375ab94c39bSJan Kara * the quota file since if blocksize < pagesize, invalidation 2376ab94c39bSJan Kara * of the cache could fail because of other unrelated dirty 2377ab94c39bSJan Kara * data */ 2378ab94c39bSJan Kara sync_filesystem(sb); 2379884d179dSJan Kara invalidate_bdev(sb->s_bdev); 2380884d179dSJan Kara } 2381884d179dSJan Kara 2382884d179dSJan Kara error = -EINVAL; 2383884d179dSJan Kara if (!fmt->qf_ops->check_quota_file(sb, type)) 2384c7d3d283SJan Kara goto out_fmt; 2385884d179dSJan Kara 2386884d179dSJan Kara dqopt->ops[type] = fmt->qf_ops; 2387884d179dSJan Kara dqopt->info[type].dqi_format = fmt; 2388884d179dSJan Kara dqopt->info[type].dqi_fmt_id = format_id; 2389884d179dSJan Kara INIT_LIST_HEAD(&dqopt->info[type].dqi_dirty_list); 2390268157baSJan Kara error = dqopt->ops[type]->read_file_info(sb, type); 239142fdb858SJan Kara if (error < 0) 2392c7d3d283SJan Kara goto out_fmt; 239315512377SJan Kara if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) { 239415512377SJan Kara spin_lock(&dq_data_lock); 239546fe44ceSJan Kara dqopt->info[type].dqi_flags |= DQF_SYS_FILE; 239615512377SJan Kara spin_unlock(&dq_data_lock); 239715512377SJan Kara } 2398884d179dSJan Kara spin_lock(&dq_state_lock); 2399884d179dSJan Kara dqopt->flags |= dquot_state_flag(flags, type); 2400884d179dSJan Kara spin_unlock(&dq_state_lock); 2401884d179dSJan Kara 24021a6152d3SChao Yu error = add_dquot_ref(sb, type); 24031a6152d3SChao Yu if (error) 24041a6152d3SChao Yu dquot_disable(sb, type, flags); 2405884d179dSJan Kara 24061a6152d3SChao Yu return error; 2407884d179dSJan Kara out_fmt: 2408884d179dSJan Kara put_quota_format(fmt); 2409884d179dSJan Kara 2410884d179dSJan Kara return error; 2411884d179dSJan Kara } 2412c7d3d283SJan Kara EXPORT_SYMBOL(dquot_load_quota_sb); 2413c7d3d283SJan Kara 2414c7d3d283SJan Kara /* 2415dc19432aSJan Kara * More powerful function for turning on quotas on given quota inode allowing 2416dc19432aSJan Kara * setting of individual quota flags 2417c7d3d283SJan Kara */ 2418dc19432aSJan Kara int dquot_load_quota_inode(struct inode *inode, int type, int format_id, 2419c7d3d283SJan Kara unsigned int flags) 2420c7d3d283SJan Kara { 2421c7d3d283SJan Kara int err; 2422c7d3d283SJan Kara 2423c7d3d283SJan Kara err = vfs_setup_quota_inode(inode, type); 2424c7d3d283SJan Kara if (err < 0) 2425c7d3d283SJan Kara return err; 2426c7d3d283SJan Kara err = dquot_load_quota_sb(inode->i_sb, type, format_id, flags); 2427c7d3d283SJan Kara if (err < 0) 2428c7d3d283SJan Kara vfs_cleanup_quota_inode(inode->i_sb, type); 2429c7d3d283SJan Kara return err; 2430c7d3d283SJan Kara } 2431dc19432aSJan Kara EXPORT_SYMBOL(dquot_load_quota_inode); 2432884d179dSJan Kara 2433884d179dSJan Kara /* Reenable quotas on remount RW */ 24340f0dd62fSChristoph Hellwig int dquot_resume(struct super_block *sb, int type) 2435884d179dSJan Kara { 2436884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 24370f0dd62fSChristoph Hellwig int ret = 0, cnt; 2438884d179dSJan Kara unsigned int flags; 2439884d179dSJan Kara 24407d6cd73dSJan Kara /* s_umount should be held in exclusive mode */ 24417d6cd73dSJan Kara if (WARN_ON_ONCE(down_read_trylock(&sb->s_umount))) 24427d6cd73dSJan Kara up_read(&sb->s_umount); 24437d6cd73dSJan Kara 24440f0dd62fSChristoph Hellwig for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 24450f0dd62fSChristoph Hellwig if (type != -1 && cnt != type) 24460f0dd62fSChristoph Hellwig continue; 2447c3b00446SJan Kara if (!sb_has_quota_suspended(sb, cnt)) 24480f0dd62fSChristoph Hellwig continue; 2449c3b00446SJan Kara 2450884d179dSJan Kara spin_lock(&dq_state_lock); 2451884d179dSJan Kara flags = dqopt->flags & dquot_state_flag(DQUOT_USAGE_ENABLED | 24520f0dd62fSChristoph Hellwig DQUOT_LIMITS_ENABLED, 24530f0dd62fSChristoph Hellwig cnt); 24540f0dd62fSChristoph Hellwig dqopt->flags &= ~dquot_state_flag(DQUOT_STATE_FLAGS, cnt); 2455884d179dSJan Kara spin_unlock(&dq_state_lock); 2456884d179dSJan Kara 24570f0dd62fSChristoph Hellwig flags = dquot_generic_flag(flags, cnt); 2458ae45f07dSJan Kara ret = dquot_load_quota_sb(sb, cnt, dqopt->info[cnt].dqi_fmt_id, 2459ae45f07dSJan Kara flags); 2460ae45f07dSJan Kara if (ret < 0) 2461e51d68e7SAnant Thazhemadam vfs_cleanup_quota_inode(sb, cnt); 24620f0dd62fSChristoph Hellwig } 2463884d179dSJan Kara 2464884d179dSJan Kara return ret; 2465884d179dSJan Kara } 24660f0dd62fSChristoph Hellwig EXPORT_SYMBOL(dquot_resume); 2467884d179dSJan Kara 2468f00c9e44SJan Kara int dquot_quota_on(struct super_block *sb, int type, int format_id, 24698c54ca9cSAl Viro const struct path *path) 2470884d179dSJan Kara { 2471884d179dSJan Kara int error = security_quota_on(path->dentry); 2472884d179dSJan Kara if (error) 2473884d179dSJan Kara return error; 2474884d179dSJan Kara /* Quota file not on the same filesystem? */ 2475d8c9584eSAl Viro if (path->dentry->d_sb != sb) 2476884d179dSJan Kara error = -EXDEV; 2477884d179dSJan Kara else 2478dc19432aSJan Kara error = dquot_load_quota_inode(d_inode(path->dentry), type, 2479884d179dSJan Kara format_id, DQUOT_USAGE_ENABLED | 2480884d179dSJan Kara DQUOT_LIMITS_ENABLED); 2481884d179dSJan Kara return error; 2482884d179dSJan Kara } 2483287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_quota_on); 2484884d179dSJan Kara 2485884d179dSJan Kara /* 2486884d179dSJan Kara * This function is used when filesystem needs to initialize quotas 2487884d179dSJan Kara * during mount time. 2488884d179dSJan Kara */ 2489287a8095SChristoph Hellwig int dquot_quota_on_mount(struct super_block *sb, char *qf_name, 2490884d179dSJan Kara int format_id, int type) 2491884d179dSJan Kara { 2492884d179dSJan Kara struct dentry *dentry; 2493884d179dSJan Kara int error; 2494884d179dSJan Kara 24956c2d4798SAl Viro dentry = lookup_positive_unlocked(qf_name, sb->s_root, strlen(qf_name)); 2496884d179dSJan Kara if (IS_ERR(dentry)) 2497884d179dSJan Kara return PTR_ERR(dentry); 2498884d179dSJan Kara 2499884d179dSJan Kara error = security_quota_on(dentry); 2500884d179dSJan Kara if (!error) 2501dc19432aSJan Kara error = dquot_load_quota_inode(d_inode(dentry), type, format_id, 2502884d179dSJan Kara DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); 2503884d179dSJan Kara 2504884d179dSJan Kara dput(dentry); 2505884d179dSJan Kara return error; 2506884d179dSJan Kara } 2507287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_quota_on_mount); 2508884d179dSJan Kara 25093e2af67eSJan Kara static int dquot_quota_enable(struct super_block *sb, unsigned int flags) 25103e2af67eSJan Kara { 25113e2af67eSJan Kara int ret; 25123e2af67eSJan Kara int type; 25133e2af67eSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 25143e2af67eSJan Kara 25153e2af67eSJan Kara if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) 25163e2af67eSJan Kara return -ENOSYS; 25173e2af67eSJan Kara /* Accounting cannot be turned on while fs is mounted */ 25183e2af67eSJan Kara flags &= ~(FS_QUOTA_UDQ_ACCT | FS_QUOTA_GDQ_ACCT | FS_QUOTA_PDQ_ACCT); 25193e2af67eSJan Kara if (!flags) 25203e2af67eSJan Kara return -EINVAL; 25213e2af67eSJan Kara for (type = 0; type < MAXQUOTAS; type++) { 25223e2af67eSJan Kara if (!(flags & qtype_enforce_flag(type))) 25233e2af67eSJan Kara continue; 25243e2af67eSJan Kara /* Can't enforce without accounting */ 2525069a9166SJan Kara if (!sb_has_quota_usage_enabled(sb, type)) { 2526069a9166SJan Kara ret = -EINVAL; 25273e2af67eSJan Kara goto out_err; 25283e2af67eSJan Kara } 2529069a9166SJan Kara if (sb_has_quota_limits_enabled(sb, type)) { 2530069a9166SJan Kara ret = -EBUSY; 2531069a9166SJan Kara goto out_err; 2532069a9166SJan Kara } 2533069a9166SJan Kara spin_lock(&dq_state_lock); 2534069a9166SJan Kara dqopt->flags |= dquot_state_flag(DQUOT_LIMITS_ENABLED, type); 2535069a9166SJan Kara spin_unlock(&dq_state_lock); 2536069a9166SJan Kara } 25373e2af67eSJan Kara return 0; 25383e2af67eSJan Kara out_err: 25393e2af67eSJan Kara /* Backout enforcement enablement we already did */ 25403e2af67eSJan Kara for (type--; type >= 0; type--) { 25413e2af67eSJan Kara if (flags & qtype_enforce_flag(type)) 25423e2af67eSJan Kara dquot_disable(sb, type, DQUOT_LIMITS_ENABLED); 25433e2af67eSJan Kara } 25443e2af67eSJan Kara /* Error code translation for better compatibility with XFS */ 25453e2af67eSJan Kara if (ret == -EBUSY) 25463e2af67eSJan Kara ret = -EEXIST; 25473e2af67eSJan Kara return ret; 25483e2af67eSJan Kara } 25493e2af67eSJan Kara 25503e2af67eSJan Kara static int dquot_quota_disable(struct super_block *sb, unsigned int flags) 25513e2af67eSJan Kara { 25523e2af67eSJan Kara int ret; 25533e2af67eSJan Kara int type; 25543e2af67eSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 25553e2af67eSJan Kara 25563e2af67eSJan Kara if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) 25573e2af67eSJan Kara return -ENOSYS; 25583e2af67eSJan Kara /* 25593e2af67eSJan Kara * We don't support turning off accounting via quotactl. In principle 25603e2af67eSJan Kara * quota infrastructure can do this but filesystems don't expect 25613e2af67eSJan Kara * userspace to be able to do it. 25623e2af67eSJan Kara */ 25633e2af67eSJan Kara if (flags & 25643e2af67eSJan Kara (FS_QUOTA_UDQ_ACCT | FS_QUOTA_GDQ_ACCT | FS_QUOTA_PDQ_ACCT)) 25653e2af67eSJan Kara return -EOPNOTSUPP; 25663e2af67eSJan Kara 25673e2af67eSJan Kara /* Filter out limits not enabled */ 25683e2af67eSJan Kara for (type = 0; type < MAXQUOTAS; type++) 25693e2af67eSJan Kara if (!sb_has_quota_limits_enabled(sb, type)) 25703e2af67eSJan Kara flags &= ~qtype_enforce_flag(type); 25713e2af67eSJan Kara /* Nothing left? */ 25723e2af67eSJan Kara if (!flags) 25733e2af67eSJan Kara return -EEXIST; 25743e2af67eSJan Kara for (type = 0; type < MAXQUOTAS; type++) { 25753e2af67eSJan Kara if (flags & qtype_enforce_flag(type)) { 25763e2af67eSJan Kara ret = dquot_disable(sb, type, DQUOT_LIMITS_ENABLED); 25773e2af67eSJan Kara if (ret < 0) 25783e2af67eSJan Kara goto out_err; 25793e2af67eSJan Kara } 25803e2af67eSJan Kara } 25813e2af67eSJan Kara return 0; 25823e2af67eSJan Kara out_err: 25833e2af67eSJan Kara /* Backout enforcement disabling we already did */ 25843e2af67eSJan Kara for (type--; type >= 0; type--) { 2585069a9166SJan Kara if (flags & qtype_enforce_flag(type)) { 2586069a9166SJan Kara spin_lock(&dq_state_lock); 2587069a9166SJan Kara dqopt->flags |= 2588069a9166SJan Kara dquot_state_flag(DQUOT_LIMITS_ENABLED, type); 2589069a9166SJan Kara spin_unlock(&dq_state_lock); 2590069a9166SJan Kara } 25913e2af67eSJan Kara } 25923e2af67eSJan Kara return ret; 25933e2af67eSJan Kara } 25943e2af67eSJan Kara 2595884d179dSJan Kara /* Generic routine for getting common part of quota structure */ 259614bf61ffSJan Kara static void do_get_dqblk(struct dquot *dquot, struct qc_dqblk *di) 2597884d179dSJan Kara { 2598884d179dSJan Kara struct mem_dqblk *dm = &dquot->dq_dqb; 2599884d179dSJan Kara 2600b9b2dd36SChristoph Hellwig memset(di, 0, sizeof(*di)); 26017b9ca4c6SJan Kara spin_lock(&dquot->dq_dqb_lock); 260214bf61ffSJan Kara di->d_spc_hardlimit = dm->dqb_bhardlimit; 260314bf61ffSJan Kara di->d_spc_softlimit = dm->dqb_bsoftlimit; 2604b9b2dd36SChristoph Hellwig di->d_ino_hardlimit = dm->dqb_ihardlimit; 2605b9b2dd36SChristoph Hellwig di->d_ino_softlimit = dm->dqb_isoftlimit; 260614bf61ffSJan Kara di->d_space = dm->dqb_curspace + dm->dqb_rsvspace; 260714bf61ffSJan Kara di->d_ino_count = dm->dqb_curinodes; 260814bf61ffSJan Kara di->d_spc_timer = dm->dqb_btime; 260914bf61ffSJan Kara di->d_ino_timer = dm->dqb_itime; 26107b9ca4c6SJan Kara spin_unlock(&dquot->dq_dqb_lock); 2611884d179dSJan Kara } 2612884d179dSJan Kara 261374a8a103SEric W. Biederman int dquot_get_dqblk(struct super_block *sb, struct kqid qid, 261414bf61ffSJan Kara struct qc_dqblk *di) 2615884d179dSJan Kara { 2616884d179dSJan Kara struct dquot *dquot; 2617884d179dSJan Kara 2618aca645a6SEric W. Biederman dquot = dqget(sb, qid); 26196184fc0bSJan Kara if (IS_ERR(dquot)) 26206184fc0bSJan Kara return PTR_ERR(dquot); 2621884d179dSJan Kara do_get_dqblk(dquot, di); 2622884d179dSJan Kara dqput(dquot); 2623884d179dSJan Kara 2624884d179dSJan Kara return 0; 2625884d179dSJan Kara } 2626287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_get_dqblk); 2627884d179dSJan Kara 2628be6257b2SJan Kara int dquot_get_next_dqblk(struct super_block *sb, struct kqid *qid, 2629be6257b2SJan Kara struct qc_dqblk *di) 2630be6257b2SJan Kara { 2631be6257b2SJan Kara struct dquot *dquot; 2632be6257b2SJan Kara int err; 2633be6257b2SJan Kara 2634be6257b2SJan Kara if (!sb->dq_op->get_next_id) 2635be6257b2SJan Kara return -ENOSYS; 2636be6257b2SJan Kara err = sb->dq_op->get_next_id(sb, qid); 2637be6257b2SJan Kara if (err < 0) 2638be6257b2SJan Kara return err; 2639be6257b2SJan Kara dquot = dqget(sb, *qid); 2640be6257b2SJan Kara if (IS_ERR(dquot)) 2641be6257b2SJan Kara return PTR_ERR(dquot); 2642be6257b2SJan Kara do_get_dqblk(dquot, di); 2643be6257b2SJan Kara dqput(dquot); 2644be6257b2SJan Kara 2645be6257b2SJan Kara return 0; 2646be6257b2SJan Kara } 2647be6257b2SJan Kara EXPORT_SYMBOL(dquot_get_next_dqblk); 2648be6257b2SJan Kara 264914bf61ffSJan Kara #define VFS_QC_MASK \ 265014bf61ffSJan Kara (QC_SPACE | QC_SPC_SOFT | QC_SPC_HARD | \ 265114bf61ffSJan Kara QC_INO_COUNT | QC_INO_SOFT | QC_INO_HARD | \ 265214bf61ffSJan Kara QC_SPC_TIMER | QC_INO_TIMER) 2653c472b432SChristoph Hellwig 2654884d179dSJan Kara /* Generic routine for setting common part of quota structure */ 265514bf61ffSJan Kara static int do_set_dqblk(struct dquot *dquot, struct qc_dqblk *di) 2656884d179dSJan Kara { 2657884d179dSJan Kara struct mem_dqblk *dm = &dquot->dq_dqb; 2658884d179dSJan Kara int check_blim = 0, check_ilim = 0; 26594c376dcaSEric W. Biederman struct mem_dqinfo *dqi = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_id.type]; 2660884d179dSJan Kara 266114bf61ffSJan Kara if (di->d_fieldmask & ~VFS_QC_MASK) 2662c472b432SChristoph Hellwig return -EINVAL; 2663c472b432SChristoph Hellwig 266414bf61ffSJan Kara if (((di->d_fieldmask & QC_SPC_SOFT) && 2665b10a0819SJan Kara di->d_spc_softlimit > dqi->dqi_max_spc_limit) || 266614bf61ffSJan Kara ((di->d_fieldmask & QC_SPC_HARD) && 2667b10a0819SJan Kara di->d_spc_hardlimit > dqi->dqi_max_spc_limit) || 266814bf61ffSJan Kara ((di->d_fieldmask & QC_INO_SOFT) && 2669b10a0819SJan Kara (di->d_ino_softlimit > dqi->dqi_max_ino_limit)) || 267014bf61ffSJan Kara ((di->d_fieldmask & QC_INO_HARD) && 2671b10a0819SJan Kara (di->d_ino_hardlimit > dqi->dqi_max_ino_limit))) 2672884d179dSJan Kara return -ERANGE; 2673884d179dSJan Kara 26747b9ca4c6SJan Kara spin_lock(&dquot->dq_dqb_lock); 267514bf61ffSJan Kara if (di->d_fieldmask & QC_SPACE) { 267614bf61ffSJan Kara dm->dqb_curspace = di->d_space - dm->dqb_rsvspace; 2677884d179dSJan Kara check_blim = 1; 267808261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags); 2679884d179dSJan Kara } 2680c472b432SChristoph Hellwig 268114bf61ffSJan Kara if (di->d_fieldmask & QC_SPC_SOFT) 268214bf61ffSJan Kara dm->dqb_bsoftlimit = di->d_spc_softlimit; 268314bf61ffSJan Kara if (di->d_fieldmask & QC_SPC_HARD) 268414bf61ffSJan Kara dm->dqb_bhardlimit = di->d_spc_hardlimit; 268514bf61ffSJan Kara if (di->d_fieldmask & (QC_SPC_SOFT | QC_SPC_HARD)) { 2686884d179dSJan Kara check_blim = 1; 268708261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags); 2688884d179dSJan Kara } 2689c472b432SChristoph Hellwig 269014bf61ffSJan Kara if (di->d_fieldmask & QC_INO_COUNT) { 269114bf61ffSJan Kara dm->dqb_curinodes = di->d_ino_count; 2692884d179dSJan Kara check_ilim = 1; 269308261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags); 2694884d179dSJan Kara } 2695c472b432SChristoph Hellwig 269614bf61ffSJan Kara if (di->d_fieldmask & QC_INO_SOFT) 2697c472b432SChristoph Hellwig dm->dqb_isoftlimit = di->d_ino_softlimit; 269814bf61ffSJan Kara if (di->d_fieldmask & QC_INO_HARD) 2699c472b432SChristoph Hellwig dm->dqb_ihardlimit = di->d_ino_hardlimit; 270014bf61ffSJan Kara if (di->d_fieldmask & (QC_INO_SOFT | QC_INO_HARD)) { 2701884d179dSJan Kara check_ilim = 1; 270208261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags); 2703884d179dSJan Kara } 2704c472b432SChristoph Hellwig 270514bf61ffSJan Kara if (di->d_fieldmask & QC_SPC_TIMER) { 270614bf61ffSJan Kara dm->dqb_btime = di->d_spc_timer; 2707884d179dSJan Kara check_blim = 1; 270808261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags); 2709884d179dSJan Kara } 2710c472b432SChristoph Hellwig 271114bf61ffSJan Kara if (di->d_fieldmask & QC_INO_TIMER) { 271214bf61ffSJan Kara dm->dqb_itime = di->d_ino_timer; 2713884d179dSJan Kara check_ilim = 1; 271408261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags); 2715884d179dSJan Kara } 2716884d179dSJan Kara 2717884d179dSJan Kara if (check_blim) { 2718268157baSJan Kara if (!dm->dqb_bsoftlimit || 27194b8e1106SChengguang Xu dm->dqb_curspace + dm->dqb_rsvspace <= dm->dqb_bsoftlimit) { 2720884d179dSJan Kara dm->dqb_btime = 0; 2721884d179dSJan Kara clear_bit(DQ_BLKS_B, &dquot->dq_flags); 272214bf61ffSJan Kara } else if (!(di->d_fieldmask & QC_SPC_TIMER)) 2723268157baSJan Kara /* Set grace only if user hasn't provided his own... */ 2724e008bb61SArnd Bergmann dm->dqb_btime = ktime_get_real_seconds() + dqi->dqi_bgrace; 2725884d179dSJan Kara } 2726884d179dSJan Kara if (check_ilim) { 2727268157baSJan Kara if (!dm->dqb_isoftlimit || 27284b8e1106SChengguang Xu dm->dqb_curinodes <= dm->dqb_isoftlimit) { 2729884d179dSJan Kara dm->dqb_itime = 0; 2730884d179dSJan Kara clear_bit(DQ_INODES_B, &dquot->dq_flags); 273114bf61ffSJan Kara } else if (!(di->d_fieldmask & QC_INO_TIMER)) 2732268157baSJan Kara /* Set grace only if user hasn't provided his own... */ 2733e008bb61SArnd Bergmann dm->dqb_itime = ktime_get_real_seconds() + dqi->dqi_igrace; 2734884d179dSJan Kara } 2735268157baSJan Kara if (dm->dqb_bhardlimit || dm->dqb_bsoftlimit || dm->dqb_ihardlimit || 2736268157baSJan Kara dm->dqb_isoftlimit) 2737884d179dSJan Kara clear_bit(DQ_FAKE_B, &dquot->dq_flags); 2738884d179dSJan Kara else 2739884d179dSJan Kara set_bit(DQ_FAKE_B, &dquot->dq_flags); 27407b9ca4c6SJan Kara spin_unlock(&dquot->dq_dqb_lock); 2741884d179dSJan Kara mark_dquot_dirty(dquot); 2742884d179dSJan Kara 2743884d179dSJan Kara return 0; 2744884d179dSJan Kara } 2745884d179dSJan Kara 274674a8a103SEric W. Biederman int dquot_set_dqblk(struct super_block *sb, struct kqid qid, 274714bf61ffSJan Kara struct qc_dqblk *di) 2748884d179dSJan Kara { 2749884d179dSJan Kara struct dquot *dquot; 2750884d179dSJan Kara int rc; 2751884d179dSJan Kara 2752aca645a6SEric W. Biederman dquot = dqget(sb, qid); 27536184fc0bSJan Kara if (IS_ERR(dquot)) { 27546184fc0bSJan Kara rc = PTR_ERR(dquot); 2755884d179dSJan Kara goto out; 2756884d179dSJan Kara } 2757884d179dSJan Kara rc = do_set_dqblk(dquot, di); 2758884d179dSJan Kara dqput(dquot); 2759884d179dSJan Kara out: 2760884d179dSJan Kara return rc; 2761884d179dSJan Kara } 2762287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_set_dqblk); 2763884d179dSJan Kara 2764884d179dSJan Kara /* Generic routine for getting common part of quota file information */ 27650a240339SJan Kara int dquot_get_state(struct super_block *sb, struct qc_state *state) 2766884d179dSJan Kara { 2767884d179dSJan Kara struct mem_dqinfo *mi; 27680a240339SJan Kara struct qc_type_state *tstate; 27690a240339SJan Kara struct quota_info *dqopt = sb_dqopt(sb); 27700a240339SJan Kara int type; 2771884d179dSJan Kara 27720a240339SJan Kara memset(state, 0, sizeof(*state)); 27730a240339SJan Kara for (type = 0; type < MAXQUOTAS; type++) { 27740a240339SJan Kara if (!sb_has_quota_active(sb, type)) 27750a240339SJan Kara continue; 27760a240339SJan Kara tstate = state->s_state + type; 2777884d179dSJan Kara mi = sb_dqopt(sb)->info + type; 27780a240339SJan Kara tstate->flags = QCI_ACCT_ENABLED; 2779884d179dSJan Kara spin_lock(&dq_data_lock); 27800a240339SJan Kara if (mi->dqi_flags & DQF_SYS_FILE) 27810a240339SJan Kara tstate->flags |= QCI_SYSFILE; 27820a240339SJan Kara if (mi->dqi_flags & DQF_ROOT_SQUASH) 27830a240339SJan Kara tstate->flags |= QCI_ROOT_SQUASH; 27840a240339SJan Kara if (sb_has_quota_limits_enabled(sb, type)) 27850a240339SJan Kara tstate->flags |= QCI_LIMITS_ENFORCED; 27860a240339SJan Kara tstate->spc_timelimit = mi->dqi_bgrace; 27870a240339SJan Kara tstate->ino_timelimit = mi->dqi_igrace; 2788a0828b6cSJan Kara if (dqopt->files[type]) { 27890a240339SJan Kara tstate->ino = dqopt->files[type]->i_ino; 27900a240339SJan Kara tstate->blocks = dqopt->files[type]->i_blocks; 2791a0828b6cSJan Kara } 27920a240339SJan Kara tstate->nextents = 1; /* We don't know... */ 2793884d179dSJan Kara spin_unlock(&dq_data_lock); 27940a240339SJan Kara } 2795884d179dSJan Kara return 0; 2796884d179dSJan Kara } 27970a240339SJan Kara EXPORT_SYMBOL(dquot_get_state); 2798884d179dSJan Kara 2799884d179dSJan Kara /* Generic routine for setting common part of quota file information */ 28005eacb2acSJan Kara int dquot_set_dqinfo(struct super_block *sb, int type, struct qc_info *ii) 2801884d179dSJan Kara { 2802884d179dSJan Kara struct mem_dqinfo *mi; 2803884d179dSJan Kara int err = 0; 2804884d179dSJan Kara 28055eacb2acSJan Kara if ((ii->i_fieldmask & QC_WARNS_MASK) || 28065eacb2acSJan Kara (ii->i_fieldmask & QC_RT_SPC_TIMER)) 28075eacb2acSJan Kara return -EINVAL; 28089d1ccbe7SJan Kara if (!sb_has_quota_active(sb, type)) 28099d1ccbe7SJan Kara return -ESRCH; 2810884d179dSJan Kara mi = sb_dqopt(sb)->info + type; 28115eacb2acSJan Kara if (ii->i_fieldmask & QC_FLAGS) { 28125eacb2acSJan Kara if ((ii->i_flags & QCI_ROOT_SQUASH && 28139d1ccbe7SJan Kara mi->dqi_format->qf_fmt_id != QFMT_VFS_OLD)) 28149d1ccbe7SJan Kara return -EINVAL; 2815ca6cb091SJan Kara } 2816884d179dSJan Kara spin_lock(&dq_data_lock); 28175eacb2acSJan Kara if (ii->i_fieldmask & QC_SPC_TIMER) 28185eacb2acSJan Kara mi->dqi_bgrace = ii->i_spc_timelimit; 28195eacb2acSJan Kara if (ii->i_fieldmask & QC_INO_TIMER) 28205eacb2acSJan Kara mi->dqi_igrace = ii->i_ino_timelimit; 28215eacb2acSJan Kara if (ii->i_fieldmask & QC_FLAGS) { 28225eacb2acSJan Kara if (ii->i_flags & QCI_ROOT_SQUASH) 28235eacb2acSJan Kara mi->dqi_flags |= DQF_ROOT_SQUASH; 28245eacb2acSJan Kara else 28255eacb2acSJan Kara mi->dqi_flags &= ~DQF_ROOT_SQUASH; 28265eacb2acSJan Kara } 2827884d179dSJan Kara spin_unlock(&dq_data_lock); 2828884d179dSJan Kara mark_info_dirty(sb, type); 2829884d179dSJan Kara /* Force write to disk */ 2830884d179dSJan Kara sb->dq_op->write_info(sb, type); 2831884d179dSJan Kara return err; 2832884d179dSJan Kara } 2833287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_set_dqinfo); 2834884d179dSJan Kara 28353e2af67eSJan Kara const struct quotactl_ops dquot_quotactl_sysfile_ops = { 28363e2af67eSJan Kara .quota_enable = dquot_quota_enable, 28373e2af67eSJan Kara .quota_disable = dquot_quota_disable, 28383e2af67eSJan Kara .quota_sync = dquot_quota_sync, 28390a240339SJan Kara .get_state = dquot_get_state, 28403e2af67eSJan Kara .set_info = dquot_set_dqinfo, 28413e2af67eSJan Kara .get_dqblk = dquot_get_dqblk, 2842be6257b2SJan Kara .get_nextdqblk = dquot_get_next_dqblk, 28433e2af67eSJan Kara .set_dqblk = dquot_set_dqblk 28443e2af67eSJan Kara }; 28453e2af67eSJan Kara EXPORT_SYMBOL(dquot_quotactl_sysfile_ops); 28463e2af67eSJan Kara 2847dde95888SDmitry Monakhov static int do_proc_dqstats(struct ctl_table *table, int write, 284832927393SChristoph Hellwig void *buffer, size_t *lenp, loff_t *ppos) 2849dde95888SDmitry Monakhov { 28506fcbcec9SKonstantin Khlebnikov unsigned int type = (unsigned long *)table->data - dqstats.stat; 28516fcbcec9SKonstantin Khlebnikov s64 value = percpu_counter_sum(&dqstats.counter[type]); 28526fcbcec9SKonstantin Khlebnikov 28536fcbcec9SKonstantin Khlebnikov /* Filter negative values for non-monotonic counters */ 28546fcbcec9SKonstantin Khlebnikov if (value < 0 && (type == DQST_ALLOC_DQUOTS || 28556fcbcec9SKonstantin Khlebnikov type == DQST_FREE_DQUOTS)) 28566fcbcec9SKonstantin Khlebnikov value = 0; 2857f32764bdSDmitry Monakhov 2858f32764bdSDmitry Monakhov /* Update global table */ 28596fcbcec9SKonstantin Khlebnikov dqstats.stat[type] = value; 28606fcbcec9SKonstantin Khlebnikov return proc_doulongvec_minmax(table, write, buffer, lenp, ppos); 2861dde95888SDmitry Monakhov } 2862dde95888SDmitry Monakhov 2863e628753bSJoe Perches static struct ctl_table fs_dqstats_table[] = { 2864884d179dSJan Kara { 2865884d179dSJan Kara .procname = "lookups", 2866dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_LOOKUPS], 28676fcbcec9SKonstantin Khlebnikov .maxlen = sizeof(unsigned long), 2868884d179dSJan Kara .mode = 0444, 2869dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2870884d179dSJan Kara }, 2871884d179dSJan Kara { 2872884d179dSJan Kara .procname = "drops", 2873dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_DROPS], 28746fcbcec9SKonstantin Khlebnikov .maxlen = sizeof(unsigned long), 2875884d179dSJan Kara .mode = 0444, 2876dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2877884d179dSJan Kara }, 2878884d179dSJan Kara { 2879884d179dSJan Kara .procname = "reads", 2880dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_READS], 28816fcbcec9SKonstantin Khlebnikov .maxlen = sizeof(unsigned long), 2882884d179dSJan Kara .mode = 0444, 2883dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2884884d179dSJan Kara }, 2885884d179dSJan Kara { 2886884d179dSJan Kara .procname = "writes", 2887dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_WRITES], 28886fcbcec9SKonstantin Khlebnikov .maxlen = sizeof(unsigned long), 2889884d179dSJan Kara .mode = 0444, 2890dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2891884d179dSJan Kara }, 2892884d179dSJan Kara { 2893884d179dSJan Kara .procname = "cache_hits", 2894dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_CACHE_HITS], 28956fcbcec9SKonstantin Khlebnikov .maxlen = sizeof(unsigned long), 2896884d179dSJan Kara .mode = 0444, 2897dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2898884d179dSJan Kara }, 2899884d179dSJan Kara { 2900884d179dSJan Kara .procname = "allocated_dquots", 2901dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_ALLOC_DQUOTS], 29026fcbcec9SKonstantin Khlebnikov .maxlen = sizeof(unsigned long), 2903884d179dSJan Kara .mode = 0444, 2904dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2905884d179dSJan Kara }, 2906884d179dSJan Kara { 2907884d179dSJan Kara .procname = "free_dquots", 2908dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_FREE_DQUOTS], 29096fcbcec9SKonstantin Khlebnikov .maxlen = sizeof(unsigned long), 2910884d179dSJan Kara .mode = 0444, 2911dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2912884d179dSJan Kara }, 2913884d179dSJan Kara { 2914884d179dSJan Kara .procname = "syncs", 2915dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_SYNCS], 29166fcbcec9SKonstantin Khlebnikov .maxlen = sizeof(unsigned long), 2917884d179dSJan Kara .mode = 0444, 2918dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2919884d179dSJan Kara }, 2920884d179dSJan Kara #ifdef CONFIG_PRINT_QUOTA_WARNING 2921884d179dSJan Kara { 2922884d179dSJan Kara .procname = "warnings", 2923884d179dSJan Kara .data = &flag_print_warnings, 2924884d179dSJan Kara .maxlen = sizeof(int), 2925884d179dSJan Kara .mode = 0644, 29266d456111SEric W. Biederman .proc_handler = proc_dointvec, 2927884d179dSJan Kara }, 2928884d179dSJan Kara #endif 2929ab09203eSEric W. Biederman { }, 2930884d179dSJan Kara }; 2931884d179dSJan Kara 2932e628753bSJoe Perches static struct ctl_table fs_table[] = { 2933884d179dSJan Kara { 2934884d179dSJan Kara .procname = "quota", 2935884d179dSJan Kara .mode = 0555, 2936884d179dSJan Kara .child = fs_dqstats_table, 2937884d179dSJan Kara }, 2938ab09203eSEric W. Biederman { }, 2939884d179dSJan Kara }; 2940884d179dSJan Kara 2941e628753bSJoe Perches static struct ctl_table sys_table[] = { 2942884d179dSJan Kara { 2943884d179dSJan Kara .procname = "fs", 2944884d179dSJan Kara .mode = 0555, 2945884d179dSJan Kara .child = fs_table, 2946884d179dSJan Kara }, 2947ab09203eSEric W. Biederman { }, 2948884d179dSJan Kara }; 2949884d179dSJan Kara 2950884d179dSJan Kara static int __init dquot_init(void) 2951884d179dSJan Kara { 2952f32764bdSDmitry Monakhov int i, ret; 2953884d179dSJan Kara unsigned long nr_hash, order; 2954884d179dSJan Kara 2955884d179dSJan Kara printk(KERN_NOTICE "VFS: Disk quotas %s\n", __DQUOT_VERSION__); 2956884d179dSJan Kara 2957884d179dSJan Kara register_sysctl_table(sys_table); 2958884d179dSJan Kara 2959884d179dSJan Kara dquot_cachep = kmem_cache_create("dquot", 2960884d179dSJan Kara sizeof(struct dquot), sizeof(unsigned long) * 4, 2961884d179dSJan Kara (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| 2962884d179dSJan Kara SLAB_MEM_SPREAD|SLAB_PANIC), 2963884d179dSJan Kara NULL); 2964884d179dSJan Kara 2965884d179dSJan Kara order = 0; 29661aa3b3e0SJia-Ju Bai dquot_hash = (struct hlist_head *)__get_free_pages(GFP_KERNEL, order); 2967884d179dSJan Kara if (!dquot_hash) 2968884d179dSJan Kara panic("Cannot create dquot hash table"); 2969884d179dSJan Kara 2970f32764bdSDmitry Monakhov for (i = 0; i < _DQST_DQSTAT_LAST; i++) { 2971908c7f19STejun Heo ret = percpu_counter_init(&dqstats.counter[i], 0, GFP_KERNEL); 2972f32764bdSDmitry Monakhov if (ret) 2973f32764bdSDmitry Monakhov panic("Cannot create dquot stat counters"); 2974f32764bdSDmitry Monakhov } 2975dde95888SDmitry Monakhov 2976884d179dSJan Kara /* Find power-of-two hlist_heads which can fit into allocation */ 2977884d179dSJan Kara nr_hash = (1UL << order) * PAGE_SIZE / sizeof(struct hlist_head); 297824fc755fSChengguang Xu dq_hash_bits = ilog2(nr_hash); 2979884d179dSJan Kara 2980884d179dSJan Kara nr_hash = 1UL << dq_hash_bits; 2981884d179dSJan Kara dq_hash_mask = nr_hash - 1; 2982884d179dSJan Kara for (i = 0; i < nr_hash; i++) 2983884d179dSJan Kara INIT_HLIST_HEAD(dquot_hash + i); 2984884d179dSJan Kara 298519858e7bSAnton Blanchard pr_info("VFS: Dquot-cache hash table entries: %ld (order %ld," 298619858e7bSAnton Blanchard " %ld bytes)\n", nr_hash, order, (PAGE_SIZE << order)); 2987884d179dSJan Kara 298888bc0edeSTetsuo Handa if (register_shrinker(&dqcache_shrinker)) 298988bc0edeSTetsuo Handa panic("Cannot register dquot shrinker"); 2990884d179dSJan Kara 2991884d179dSJan Kara return 0; 2992884d179dSJan Kara } 2993331221faSPaul Gortmaker fs_initcall(dquot_init); 2994