1884d179dSJan Kara /* 2884d179dSJan Kara * Implementation of the diskquota system for the LINUX operating system. QUOTA 3884d179dSJan Kara * is implemented using the BSD system call interface as the means of 4884d179dSJan Kara * communication with the user level. This file contains the generic routines 5884d179dSJan Kara * called by the different filesystems on allocation of an inode or block. 6884d179dSJan Kara * These routines take care of the administration needed to have a consistent 7884d179dSJan Kara * diskquota tracking system. The ideas of both user and group quotas are based 8884d179dSJan Kara * on the Melbourne quota system as used on BSD derived systems. The internal 9884d179dSJan Kara * implementation is based on one of the several variants of the LINUX 10884d179dSJan Kara * inode-subsystem with added complexity of the diskquota system. 11884d179dSJan Kara * 12884d179dSJan Kara * Author: Marco van Wieringen <mvw@planets.elm.net> 13884d179dSJan Kara * 14884d179dSJan Kara * Fixes: Dmitry Gorodchanin <pgmdsg@ibi.com>, 11 Feb 96 15884d179dSJan Kara * 16884d179dSJan Kara * Revised list management to avoid races 17884d179dSJan Kara * -- Bill Hawes, <whawes@star.net>, 9/98 18884d179dSJan Kara * 19884d179dSJan Kara * Fixed races in dquot_transfer(), dqget() and dquot_alloc_...(). 20884d179dSJan Kara * As the consequence the locking was moved from dquot_decr_...(), 21884d179dSJan Kara * dquot_incr_...() to calling functions. 22884d179dSJan Kara * invalidate_dquots() now writes modified dquots. 23884d179dSJan Kara * Serialized quota_off() and quota_on() for mount point. 24884d179dSJan Kara * Fixed a few bugs in grow_dquots(). 25884d179dSJan Kara * Fixed deadlock in write_dquot() - we no longer account quotas on 26884d179dSJan Kara * quota files 27884d179dSJan Kara * remove_dquot_ref() moved to inode.c - it now traverses through inodes 28884d179dSJan Kara * add_dquot_ref() restarts after blocking 29884d179dSJan Kara * Added check for bogus uid and fixed check for group in quotactl. 30884d179dSJan Kara * Jan Kara, <jack@suse.cz>, sponsored by SuSE CR, 10-11/99 31884d179dSJan Kara * 32884d179dSJan Kara * Used struct list_head instead of own list struct 33884d179dSJan Kara * Invalidation of referenced dquots is no longer possible 34884d179dSJan Kara * Improved free_dquots list management 35884d179dSJan Kara * Quota and i_blocks are now updated in one place to avoid races 36884d179dSJan Kara * Warnings are now delayed so we won't block in critical section 37884d179dSJan Kara * Write updated not to require dquot lock 38884d179dSJan Kara * Jan Kara, <jack@suse.cz>, 9/2000 39884d179dSJan Kara * 40884d179dSJan Kara * Added dynamic quota structure allocation 41884d179dSJan Kara * Jan Kara <jack@suse.cz> 12/2000 42884d179dSJan Kara * 43884d179dSJan Kara * Rewritten quota interface. Implemented new quota format and 44884d179dSJan Kara * formats registering. 45884d179dSJan Kara * Jan Kara, <jack@suse.cz>, 2001,2002 46884d179dSJan Kara * 47884d179dSJan Kara * New SMP locking. 48884d179dSJan Kara * Jan Kara, <jack@suse.cz>, 10/2002 49884d179dSJan Kara * 50884d179dSJan Kara * Added journalled quota support, fix lock inversion problems 51884d179dSJan Kara * Jan Kara, <jack@suse.cz>, 2003,2004 52884d179dSJan Kara * 53884d179dSJan Kara * (C) Copyright 1994 - 1997 Marco van Wieringen 54884d179dSJan Kara */ 55884d179dSJan Kara 56884d179dSJan Kara #include <linux/errno.h> 57884d179dSJan Kara #include <linux/kernel.h> 58884d179dSJan Kara #include <linux/fs.h> 59884d179dSJan Kara #include <linux/mount.h> 60884d179dSJan Kara #include <linux/mm.h> 61884d179dSJan Kara #include <linux/time.h> 62884d179dSJan Kara #include <linux/types.h> 63884d179dSJan Kara #include <linux/string.h> 64884d179dSJan Kara #include <linux/fcntl.h> 65884d179dSJan Kara #include <linux/stat.h> 66884d179dSJan Kara #include <linux/tty.h> 67884d179dSJan Kara #include <linux/file.h> 68884d179dSJan Kara #include <linux/slab.h> 69884d179dSJan Kara #include <linux/sysctl.h> 70884d179dSJan Kara #include <linux/init.h> 71884d179dSJan Kara #include <linux/module.h> 72884d179dSJan Kara #include <linux/proc_fs.h> 73884d179dSJan Kara #include <linux/security.h> 7440401530SAl Viro #include <linux/sched.h> 75884d179dSJan Kara #include <linux/kmod.h> 76884d179dSJan Kara #include <linux/namei.h> 77884d179dSJan Kara #include <linux/capability.h> 78884d179dSJan Kara #include <linux/quotaops.h> 7955fa6091SDave Chinner #include "../internal.h" /* ugh */ 80884d179dSJan Kara 81f3da9310SJeff Liu #include <linux/uaccess.h> 82884d179dSJan Kara 83884d179dSJan Kara /* 84884d179dSJan Kara * There are three quota SMP locks. dq_list_lock protects all lists with quotas 85dde95888SDmitry Monakhov * and quota formats. 86884d179dSJan Kara * dq_data_lock protects data from dq_dqb and also mem_dqinfo structures and 87884d179dSJan Kara * also guards consistency of dquot->dq_dqb with inode->i_blocks, i_bytes. 88884d179dSJan Kara * i_blocks and i_bytes updates itself are guarded by i_lock acquired directly 89884d179dSJan Kara * in inode_add_bytes() and inode_sub_bytes(). dq_state_lock protects 90884d179dSJan Kara * modifications of quota state (on quotaon and quotaoff) and readers who care 91884d179dSJan Kara * about latest values take it as well. 92884d179dSJan Kara * 93884d179dSJan Kara * The spinlock ordering is hence: dq_data_lock > dq_list_lock > i_lock, 94884d179dSJan Kara * dq_list_lock > dq_state_lock 95884d179dSJan Kara * 96884d179dSJan Kara * Note that some things (eg. sb pointer, type, id) doesn't change during 97884d179dSJan Kara * the life of the dquot structure and so needn't to be protected by a lock 98884d179dSJan Kara * 99884d179dSJan Kara * Any operation working on dquots via inode pointers must hold dqptr_sem. If 100884d179dSJan Kara * operation is just reading pointers from inode (or not using them at all) the 10126245c94SJan Kara * read lock is enough. If pointers are altered function must hold write lock. 10226245c94SJan Kara * Special care needs to be taken about S_NOQUOTA inode flag (marking that 10326245c94SJan Kara * inode is a quota file). Functions adding pointers from inode to dquots have 10426245c94SJan Kara * to check this flag under dqptr_sem and then (if S_NOQUOTA is not set) they 10526245c94SJan Kara * have to do all pointer modifications before dropping dqptr_sem. This makes 10626245c94SJan Kara * sure they cannot race with quotaon which first sets S_NOQUOTA flag and 10726245c94SJan Kara * then drops all pointers to dquots from an inode. 108884d179dSJan Kara * 109884d179dSJan Kara * Each dquot has its dq_lock mutex. Locked dquots might not be referenced 110884d179dSJan Kara * from inodes (dquot_alloc_space() and such don't check the dq_lock). 111884d179dSJan Kara * Currently dquot is locked only when it is being read to memory (or space for 112884d179dSJan Kara * it is being allocated) on the first dqget() and when it is being released on 113884d179dSJan Kara * the last dqput(). The allocation and release oparations are serialized by 114884d179dSJan Kara * the dq_lock and by checking the use count in dquot_release(). Write 115884d179dSJan Kara * operations on dquots don't hold dq_lock as they copy data under dq_data_lock 116884d179dSJan Kara * spinlock to internal buffers before writing. 117884d179dSJan Kara * 118884d179dSJan Kara * Lock ordering (including related VFS locks) is the following: 119a80b12c3SJan Kara * dqonoff_mutex > i_mutex > journal_lock > dqptr_sem > dquot->dq_lock > 120884d179dSJan Kara * dqio_mutex 121a80b12c3SJan Kara * dqonoff_mutex > i_mutex comes from dquot_quota_sync, dquot_enable, etc. 122884d179dSJan Kara * The lock ordering of dqptr_sem imposed by quota code is only dqonoff_sem > 123884d179dSJan Kara * dqptr_sem. But filesystem has to count with the fact that functions such as 124884d179dSJan Kara * dquot_alloc_space() acquire dqptr_sem and they usually have to be called 125884d179dSJan Kara * from inside a transaction to keep filesystem consistency after a crash. Also 126884d179dSJan Kara * filesystems usually want to do some IO on dquot from ->mark_dirty which is 127884d179dSJan Kara * called with dqptr_sem held. 128884d179dSJan Kara */ 129884d179dSJan Kara 130c516610cSJan Kara static __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_list_lock); 131c516610cSJan Kara static __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_state_lock); 132c516610cSJan Kara __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_data_lock); 133884d179dSJan Kara EXPORT_SYMBOL(dq_data_lock); 134884d179dSJan Kara 135fb5ffb0eSJiaying Zhang void __quota_error(struct super_block *sb, const char *func, 136fb5ffb0eSJiaying Zhang const char *fmt, ...) 137fb5ffb0eSJiaying Zhang { 138fb5ffb0eSJiaying Zhang if (printk_ratelimit()) { 139055adcbdSJoe Perches va_list args; 140055adcbdSJoe Perches struct va_format vaf; 141055adcbdSJoe Perches 142fb5ffb0eSJiaying Zhang va_start(args, fmt); 143055adcbdSJoe Perches 144055adcbdSJoe Perches vaf.fmt = fmt; 145055adcbdSJoe Perches vaf.va = &args; 146055adcbdSJoe Perches 147055adcbdSJoe Perches printk(KERN_ERR "Quota error (device %s): %s: %pV\n", 148055adcbdSJoe Perches sb->s_id, func, &vaf); 149055adcbdSJoe Perches 150fb5ffb0eSJiaying Zhang va_end(args); 151fb5ffb0eSJiaying Zhang } 152fb5ffb0eSJiaying Zhang } 153fb5ffb0eSJiaying Zhang EXPORT_SYMBOL(__quota_error); 154fb5ffb0eSJiaying Zhang 155da8d1ba2SSergey Senozhatsky #if defined(CONFIG_QUOTA_DEBUG) || defined(CONFIG_PRINT_QUOTA_WARNING) 156884d179dSJan Kara static char *quotatypes[] = INITQFNAMES; 157da8d1ba2SSergey Senozhatsky #endif 158884d179dSJan Kara static struct quota_format_type *quota_formats; /* List of registered formats */ 159884d179dSJan Kara static struct quota_module_name module_names[] = INIT_QUOTA_MODULE_NAMES; 160884d179dSJan Kara 161884d179dSJan Kara /* SLAB cache for dquot structures */ 162884d179dSJan Kara static struct kmem_cache *dquot_cachep; 163884d179dSJan Kara 164884d179dSJan Kara int register_quota_format(struct quota_format_type *fmt) 165884d179dSJan Kara { 166884d179dSJan Kara spin_lock(&dq_list_lock); 167884d179dSJan Kara fmt->qf_next = quota_formats; 168884d179dSJan Kara quota_formats = fmt; 169884d179dSJan Kara spin_unlock(&dq_list_lock); 170884d179dSJan Kara return 0; 171884d179dSJan Kara } 172884d179dSJan Kara EXPORT_SYMBOL(register_quota_format); 173884d179dSJan Kara 174884d179dSJan Kara void unregister_quota_format(struct quota_format_type *fmt) 175884d179dSJan Kara { 176884d179dSJan Kara struct quota_format_type **actqf; 177884d179dSJan Kara 178884d179dSJan Kara spin_lock(&dq_list_lock); 179268157baSJan Kara for (actqf = "a_formats; *actqf && *actqf != fmt; 180268157baSJan Kara actqf = &(*actqf)->qf_next) 181268157baSJan Kara ; 182884d179dSJan Kara if (*actqf) 183884d179dSJan Kara *actqf = (*actqf)->qf_next; 184884d179dSJan Kara spin_unlock(&dq_list_lock); 185884d179dSJan Kara } 186884d179dSJan Kara EXPORT_SYMBOL(unregister_quota_format); 187884d179dSJan Kara 188884d179dSJan Kara static struct quota_format_type *find_quota_format(int id) 189884d179dSJan Kara { 190884d179dSJan Kara struct quota_format_type *actqf; 191884d179dSJan Kara 192884d179dSJan Kara spin_lock(&dq_list_lock); 193268157baSJan Kara for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id; 194268157baSJan Kara actqf = actqf->qf_next) 195268157baSJan Kara ; 196884d179dSJan Kara if (!actqf || !try_module_get(actqf->qf_owner)) { 197884d179dSJan Kara int qm; 198884d179dSJan Kara 199884d179dSJan Kara spin_unlock(&dq_list_lock); 200884d179dSJan Kara 201268157baSJan Kara for (qm = 0; module_names[qm].qm_fmt_id && 202268157baSJan Kara module_names[qm].qm_fmt_id != id; qm++) 203268157baSJan Kara ; 204268157baSJan Kara if (!module_names[qm].qm_fmt_id || 205268157baSJan Kara request_module(module_names[qm].qm_mod_name)) 206884d179dSJan Kara return NULL; 207884d179dSJan Kara 208884d179dSJan Kara spin_lock(&dq_list_lock); 209268157baSJan Kara for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id; 210268157baSJan Kara actqf = actqf->qf_next) 211268157baSJan Kara ; 212884d179dSJan Kara if (actqf && !try_module_get(actqf->qf_owner)) 213884d179dSJan Kara actqf = NULL; 214884d179dSJan Kara } 215884d179dSJan Kara spin_unlock(&dq_list_lock); 216884d179dSJan Kara return actqf; 217884d179dSJan Kara } 218884d179dSJan Kara 219884d179dSJan Kara static void put_quota_format(struct quota_format_type *fmt) 220884d179dSJan Kara { 221884d179dSJan Kara module_put(fmt->qf_owner); 222884d179dSJan Kara } 223884d179dSJan Kara 224884d179dSJan Kara /* 225884d179dSJan Kara * Dquot List Management: 226884d179dSJan Kara * The quota code uses three lists for dquot management: the inuse_list, 227884d179dSJan Kara * free_dquots, and dquot_hash[] array. A single dquot structure may be 228884d179dSJan Kara * on all three lists, depending on its current state. 229884d179dSJan Kara * 230884d179dSJan Kara * All dquots are placed to the end of inuse_list when first created, and this 231884d179dSJan Kara * list is used for invalidate operation, which must look at every dquot. 232884d179dSJan Kara * 233884d179dSJan Kara * Unused dquots (dq_count == 0) are added to the free_dquots list when freed, 234884d179dSJan Kara * and this list is searched whenever we need an available dquot. Dquots are 235884d179dSJan Kara * removed from the list as soon as they are used again, and 236884d179dSJan Kara * dqstats.free_dquots gives the number of dquots on the list. When 237884d179dSJan Kara * dquot is invalidated it's completely released from memory. 238884d179dSJan Kara * 239884d179dSJan Kara * Dquots with a specific identity (device, type and id) are placed on 240884d179dSJan Kara * one of the dquot_hash[] hash chains. The provides an efficient search 241884d179dSJan Kara * mechanism to locate a specific dquot. 242884d179dSJan Kara */ 243884d179dSJan Kara 244884d179dSJan Kara static LIST_HEAD(inuse_list); 245884d179dSJan Kara static LIST_HEAD(free_dquots); 246884d179dSJan Kara static unsigned int dq_hash_bits, dq_hash_mask; 247884d179dSJan Kara static struct hlist_head *dquot_hash; 248884d179dSJan Kara 249884d179dSJan Kara struct dqstats dqstats; 250884d179dSJan Kara EXPORT_SYMBOL(dqstats); 251884d179dSJan Kara 2520a5a9c72SJan Kara static qsize_t inode_get_rsv_space(struct inode *inode); 253871a2931SChristoph Hellwig static void __dquot_initialize(struct inode *inode, int type); 2540a5a9c72SJan Kara 255884d179dSJan Kara static inline unsigned int 2561a06d420SEric W. Biederman hashfn(const struct super_block *sb, struct kqid qid) 257884d179dSJan Kara { 2581a06d420SEric W. Biederman unsigned int id = from_kqid(&init_user_ns, qid); 2591a06d420SEric W. Biederman int type = qid.type; 260884d179dSJan Kara unsigned long tmp; 261884d179dSJan Kara 262884d179dSJan Kara tmp = (((unsigned long)sb>>L1_CACHE_SHIFT) ^ id) * (MAXQUOTAS - type); 263884d179dSJan Kara return (tmp + (tmp >> dq_hash_bits)) & dq_hash_mask; 264884d179dSJan Kara } 265884d179dSJan Kara 266884d179dSJan Kara /* 267884d179dSJan Kara * Following list functions expect dq_list_lock to be held 268884d179dSJan Kara */ 269884d179dSJan Kara static inline void insert_dquot_hash(struct dquot *dquot) 270884d179dSJan Kara { 271268157baSJan Kara struct hlist_head *head; 2721a06d420SEric W. Biederman head = dquot_hash + hashfn(dquot->dq_sb, dquot->dq_id); 273884d179dSJan Kara hlist_add_head(&dquot->dq_hash, head); 274884d179dSJan Kara } 275884d179dSJan Kara 276884d179dSJan Kara static inline void remove_dquot_hash(struct dquot *dquot) 277884d179dSJan Kara { 278884d179dSJan Kara hlist_del_init(&dquot->dq_hash); 279884d179dSJan Kara } 280884d179dSJan Kara 2817a2435d8SJan Kara static struct dquot *find_dquot(unsigned int hashent, struct super_block *sb, 2821a06d420SEric W. Biederman struct kqid qid) 283884d179dSJan Kara { 284884d179dSJan Kara struct hlist_node *node; 285884d179dSJan Kara struct dquot *dquot; 286884d179dSJan Kara 287884d179dSJan Kara hlist_for_each (node, dquot_hash+hashent) { 288884d179dSJan Kara dquot = hlist_entry(node, struct dquot, dq_hash); 2894c376dcaSEric W. Biederman if (dquot->dq_sb == sb && qid_eq(dquot->dq_id, qid)) 290884d179dSJan Kara return dquot; 291884d179dSJan Kara } 292dd6f3c6dSJan Kara return NULL; 293884d179dSJan Kara } 294884d179dSJan Kara 295884d179dSJan Kara /* Add a dquot to the tail of the free list */ 296884d179dSJan Kara static inline void put_dquot_last(struct dquot *dquot) 297884d179dSJan Kara { 298884d179dSJan Kara list_add_tail(&dquot->dq_free, &free_dquots); 299dde95888SDmitry Monakhov dqstats_inc(DQST_FREE_DQUOTS); 300884d179dSJan Kara } 301884d179dSJan Kara 302884d179dSJan Kara static inline void remove_free_dquot(struct dquot *dquot) 303884d179dSJan Kara { 304884d179dSJan Kara if (list_empty(&dquot->dq_free)) 305884d179dSJan Kara return; 306884d179dSJan Kara list_del_init(&dquot->dq_free); 307dde95888SDmitry Monakhov dqstats_dec(DQST_FREE_DQUOTS); 308884d179dSJan Kara } 309884d179dSJan Kara 310884d179dSJan Kara static inline void put_inuse(struct dquot *dquot) 311884d179dSJan Kara { 312884d179dSJan Kara /* We add to the back of inuse list so we don't have to restart 313884d179dSJan Kara * when traversing this list and we block */ 314884d179dSJan Kara list_add_tail(&dquot->dq_inuse, &inuse_list); 315dde95888SDmitry Monakhov dqstats_inc(DQST_ALLOC_DQUOTS); 316884d179dSJan Kara } 317884d179dSJan Kara 318884d179dSJan Kara static inline void remove_inuse(struct dquot *dquot) 319884d179dSJan Kara { 320dde95888SDmitry Monakhov dqstats_dec(DQST_ALLOC_DQUOTS); 321884d179dSJan Kara list_del(&dquot->dq_inuse); 322884d179dSJan Kara } 323884d179dSJan Kara /* 324884d179dSJan Kara * End of list functions needing dq_list_lock 325884d179dSJan Kara */ 326884d179dSJan Kara 327884d179dSJan Kara static void wait_on_dquot(struct dquot *dquot) 328884d179dSJan Kara { 329884d179dSJan Kara mutex_lock(&dquot->dq_lock); 330884d179dSJan Kara mutex_unlock(&dquot->dq_lock); 331884d179dSJan Kara } 332884d179dSJan Kara 333884d179dSJan Kara static inline int dquot_dirty(struct dquot *dquot) 334884d179dSJan Kara { 335884d179dSJan Kara return test_bit(DQ_MOD_B, &dquot->dq_flags); 336884d179dSJan Kara } 337884d179dSJan Kara 338884d179dSJan Kara static inline int mark_dquot_dirty(struct dquot *dquot) 339884d179dSJan Kara { 340884d179dSJan Kara return dquot->dq_sb->dq_op->mark_dirty(dquot); 341884d179dSJan Kara } 342884d179dSJan Kara 343eabf290dSDmitry Monakhov /* Mark dquot dirty in atomic manner, and return it's old dirty flag state */ 344884d179dSJan Kara int dquot_mark_dquot_dirty(struct dquot *dquot) 345884d179dSJan Kara { 346eabf290dSDmitry Monakhov int ret = 1; 347eabf290dSDmitry Monakhov 348eabf290dSDmitry Monakhov /* If quota is dirty already, we don't have to acquire dq_list_lock */ 349eabf290dSDmitry Monakhov if (test_bit(DQ_MOD_B, &dquot->dq_flags)) 350eabf290dSDmitry Monakhov return 1; 351eabf290dSDmitry Monakhov 352884d179dSJan Kara spin_lock(&dq_list_lock); 353eabf290dSDmitry Monakhov if (!test_and_set_bit(DQ_MOD_B, &dquot->dq_flags)) { 354884d179dSJan Kara list_add(&dquot->dq_dirty, &sb_dqopt(dquot->dq_sb)-> 3554c376dcaSEric W. Biederman info[dquot->dq_id.type].dqi_dirty_list); 356eabf290dSDmitry Monakhov ret = 0; 357eabf290dSDmitry Monakhov } 358884d179dSJan Kara spin_unlock(&dq_list_lock); 359eabf290dSDmitry Monakhov return ret; 360884d179dSJan Kara } 361884d179dSJan Kara EXPORT_SYMBOL(dquot_mark_dquot_dirty); 362884d179dSJan Kara 363dc52dd3aSDmitry Monakhov /* Dirtify all the dquots - this can block when journalling */ 364dc52dd3aSDmitry Monakhov static inline int mark_all_dquot_dirty(struct dquot * const *dquot) 365dc52dd3aSDmitry Monakhov { 366dc52dd3aSDmitry Monakhov int ret, err, cnt; 367dc52dd3aSDmitry Monakhov 368dc52dd3aSDmitry Monakhov ret = err = 0; 369dc52dd3aSDmitry Monakhov for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 370dc52dd3aSDmitry Monakhov if (dquot[cnt]) 371dc52dd3aSDmitry Monakhov /* Even in case of error we have to continue */ 372dc52dd3aSDmitry Monakhov ret = mark_dquot_dirty(dquot[cnt]); 373dc52dd3aSDmitry Monakhov if (!err) 374dc52dd3aSDmitry Monakhov err = ret; 375dc52dd3aSDmitry Monakhov } 376dc52dd3aSDmitry Monakhov return err; 377dc52dd3aSDmitry Monakhov } 378dc52dd3aSDmitry Monakhov 379dc52dd3aSDmitry Monakhov static inline void dqput_all(struct dquot **dquot) 380dc52dd3aSDmitry Monakhov { 381dc52dd3aSDmitry Monakhov unsigned int cnt; 382dc52dd3aSDmitry Monakhov 383dc52dd3aSDmitry Monakhov for (cnt = 0; cnt < MAXQUOTAS; cnt++) 384dc52dd3aSDmitry Monakhov dqput(dquot[cnt]); 385dc52dd3aSDmitry Monakhov } 386dc52dd3aSDmitry Monakhov 387884d179dSJan Kara /* This function needs dq_list_lock */ 388884d179dSJan Kara static inline int clear_dquot_dirty(struct dquot *dquot) 389884d179dSJan Kara { 390884d179dSJan Kara if (!test_and_clear_bit(DQ_MOD_B, &dquot->dq_flags)) 391884d179dSJan Kara return 0; 392884d179dSJan Kara list_del_init(&dquot->dq_dirty); 393884d179dSJan Kara return 1; 394884d179dSJan Kara } 395884d179dSJan Kara 396884d179dSJan Kara void mark_info_dirty(struct super_block *sb, int type) 397884d179dSJan Kara { 398884d179dSJan Kara set_bit(DQF_INFO_DIRTY_B, &sb_dqopt(sb)->info[type].dqi_flags); 399884d179dSJan Kara } 400884d179dSJan Kara EXPORT_SYMBOL(mark_info_dirty); 401884d179dSJan Kara 402884d179dSJan Kara /* 403884d179dSJan Kara * Read dquot from disk and alloc space for it 404884d179dSJan Kara */ 405884d179dSJan Kara 406884d179dSJan Kara int dquot_acquire(struct dquot *dquot) 407884d179dSJan Kara { 408884d179dSJan Kara int ret = 0, ret2 = 0; 409884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); 410884d179dSJan Kara 411884d179dSJan Kara mutex_lock(&dquot->dq_lock); 412884d179dSJan Kara mutex_lock(&dqopt->dqio_mutex); 413884d179dSJan Kara if (!test_bit(DQ_READ_B, &dquot->dq_flags)) 4144c376dcaSEric W. Biederman ret = dqopt->ops[dquot->dq_id.type]->read_dqblk(dquot); 415884d179dSJan Kara if (ret < 0) 416884d179dSJan Kara goto out_iolock; 417884d179dSJan Kara set_bit(DQ_READ_B, &dquot->dq_flags); 418884d179dSJan Kara /* Instantiate dquot if needed */ 419884d179dSJan Kara if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && !dquot->dq_off) { 4204c376dcaSEric W. Biederman ret = dqopt->ops[dquot->dq_id.type]->commit_dqblk(dquot); 421884d179dSJan Kara /* Write the info if needed */ 4224c376dcaSEric W. Biederman if (info_dirty(&dqopt->info[dquot->dq_id.type])) { 4234c376dcaSEric W. Biederman ret2 = dqopt->ops[dquot->dq_id.type]->write_file_info( 4244c376dcaSEric W. Biederman dquot->dq_sb, dquot->dq_id.type); 425268157baSJan Kara } 426884d179dSJan Kara if (ret < 0) 427884d179dSJan Kara goto out_iolock; 428884d179dSJan Kara if (ret2 < 0) { 429884d179dSJan Kara ret = ret2; 430884d179dSJan Kara goto out_iolock; 431884d179dSJan Kara } 432884d179dSJan Kara } 433884d179dSJan Kara set_bit(DQ_ACTIVE_B, &dquot->dq_flags); 434884d179dSJan Kara out_iolock: 435884d179dSJan Kara mutex_unlock(&dqopt->dqio_mutex); 436884d179dSJan Kara mutex_unlock(&dquot->dq_lock); 437884d179dSJan Kara return ret; 438884d179dSJan Kara } 439884d179dSJan Kara EXPORT_SYMBOL(dquot_acquire); 440884d179dSJan Kara 441884d179dSJan Kara /* 442884d179dSJan Kara * Write dquot to disk 443884d179dSJan Kara */ 444884d179dSJan Kara int dquot_commit(struct dquot *dquot) 445884d179dSJan Kara { 446b03f2456SJan Kara int ret = 0; 447884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); 448884d179dSJan Kara 449884d179dSJan Kara mutex_lock(&dqopt->dqio_mutex); 450884d179dSJan Kara spin_lock(&dq_list_lock); 451884d179dSJan Kara if (!clear_dquot_dirty(dquot)) { 452884d179dSJan Kara spin_unlock(&dq_list_lock); 453884d179dSJan Kara goto out_sem; 454884d179dSJan Kara } 455884d179dSJan Kara spin_unlock(&dq_list_lock); 456884d179dSJan Kara /* Inactive dquot can be only if there was error during read/init 457884d179dSJan Kara * => we have better not writing it */ 458b03f2456SJan Kara if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) 4594c376dcaSEric W. Biederman ret = dqopt->ops[dquot->dq_id.type]->commit_dqblk(dquot); 460b03f2456SJan Kara else 461b03f2456SJan Kara ret = -EIO; 462884d179dSJan Kara out_sem: 463884d179dSJan Kara mutex_unlock(&dqopt->dqio_mutex); 464884d179dSJan Kara return ret; 465884d179dSJan Kara } 466884d179dSJan Kara EXPORT_SYMBOL(dquot_commit); 467884d179dSJan Kara 468884d179dSJan Kara /* 469884d179dSJan Kara * Release dquot 470884d179dSJan Kara */ 471884d179dSJan Kara int dquot_release(struct dquot *dquot) 472884d179dSJan Kara { 473884d179dSJan Kara int ret = 0, ret2 = 0; 474884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); 475884d179dSJan Kara 476884d179dSJan Kara mutex_lock(&dquot->dq_lock); 477884d179dSJan Kara /* Check whether we are not racing with some other dqget() */ 478884d179dSJan Kara if (atomic_read(&dquot->dq_count) > 1) 479884d179dSJan Kara goto out_dqlock; 480884d179dSJan Kara mutex_lock(&dqopt->dqio_mutex); 4814c376dcaSEric W. Biederman if (dqopt->ops[dquot->dq_id.type]->release_dqblk) { 4824c376dcaSEric W. Biederman ret = dqopt->ops[dquot->dq_id.type]->release_dqblk(dquot); 483884d179dSJan Kara /* Write the info */ 4844c376dcaSEric W. Biederman if (info_dirty(&dqopt->info[dquot->dq_id.type])) { 4854c376dcaSEric W. Biederman ret2 = dqopt->ops[dquot->dq_id.type]->write_file_info( 4864c376dcaSEric W. Biederman dquot->dq_sb, dquot->dq_id.type); 487268157baSJan Kara } 488884d179dSJan Kara if (ret >= 0) 489884d179dSJan Kara ret = ret2; 490884d179dSJan Kara } 491884d179dSJan Kara clear_bit(DQ_ACTIVE_B, &dquot->dq_flags); 492884d179dSJan Kara mutex_unlock(&dqopt->dqio_mutex); 493884d179dSJan Kara out_dqlock: 494884d179dSJan Kara mutex_unlock(&dquot->dq_lock); 495884d179dSJan Kara return ret; 496884d179dSJan Kara } 497884d179dSJan Kara EXPORT_SYMBOL(dquot_release); 498884d179dSJan Kara 499884d179dSJan Kara void dquot_destroy(struct dquot *dquot) 500884d179dSJan Kara { 501884d179dSJan Kara kmem_cache_free(dquot_cachep, dquot); 502884d179dSJan Kara } 503884d179dSJan Kara EXPORT_SYMBOL(dquot_destroy); 504884d179dSJan Kara 505884d179dSJan Kara static inline void do_destroy_dquot(struct dquot *dquot) 506884d179dSJan Kara { 507884d179dSJan Kara dquot->dq_sb->dq_op->destroy_dquot(dquot); 508884d179dSJan Kara } 509884d179dSJan Kara 510884d179dSJan Kara /* Invalidate all dquots on the list. Note that this function is called after 511884d179dSJan Kara * quota is disabled and pointers from inodes removed so there cannot be new 512884d179dSJan Kara * quota users. There can still be some users of quotas due to inodes being 513884d179dSJan Kara * just deleted or pruned by prune_icache() (those are not attached to any 514884d179dSJan Kara * list) or parallel quotactl call. We have to wait for such users. 515884d179dSJan Kara */ 516884d179dSJan Kara static void invalidate_dquots(struct super_block *sb, int type) 517884d179dSJan Kara { 518884d179dSJan Kara struct dquot *dquot, *tmp; 519884d179dSJan Kara 520884d179dSJan Kara restart: 521884d179dSJan Kara spin_lock(&dq_list_lock); 522884d179dSJan Kara list_for_each_entry_safe(dquot, tmp, &inuse_list, dq_inuse) { 523884d179dSJan Kara if (dquot->dq_sb != sb) 524884d179dSJan Kara continue; 5254c376dcaSEric W. Biederman if (dquot->dq_id.type != type) 526884d179dSJan Kara continue; 527884d179dSJan Kara /* Wait for dquot users */ 528884d179dSJan Kara if (atomic_read(&dquot->dq_count)) { 529884d179dSJan Kara DEFINE_WAIT(wait); 530884d179dSJan Kara 5319f985cb6SJan Kara dqgrab(dquot); 532884d179dSJan Kara prepare_to_wait(&dquot->dq_wait_unused, &wait, 533884d179dSJan Kara TASK_UNINTERRUPTIBLE); 534884d179dSJan Kara spin_unlock(&dq_list_lock); 535884d179dSJan Kara /* Once dqput() wakes us up, we know it's time to free 536884d179dSJan Kara * the dquot. 537884d179dSJan Kara * IMPORTANT: we rely on the fact that there is always 538884d179dSJan Kara * at most one process waiting for dquot to free. 539884d179dSJan Kara * Otherwise dq_count would be > 1 and we would never 540884d179dSJan Kara * wake up. 541884d179dSJan Kara */ 542884d179dSJan Kara if (atomic_read(&dquot->dq_count) > 1) 543884d179dSJan Kara schedule(); 544884d179dSJan Kara finish_wait(&dquot->dq_wait_unused, &wait); 545884d179dSJan Kara dqput(dquot); 546884d179dSJan Kara /* At this moment dquot() need not exist (it could be 547884d179dSJan Kara * reclaimed by prune_dqcache(). Hence we must 548884d179dSJan Kara * restart. */ 549884d179dSJan Kara goto restart; 550884d179dSJan Kara } 551884d179dSJan Kara /* 552884d179dSJan Kara * Quota now has no users and it has been written on last 553884d179dSJan Kara * dqput() 554884d179dSJan Kara */ 555884d179dSJan Kara remove_dquot_hash(dquot); 556884d179dSJan Kara remove_free_dquot(dquot); 557884d179dSJan Kara remove_inuse(dquot); 558884d179dSJan Kara do_destroy_dquot(dquot); 559884d179dSJan Kara } 560884d179dSJan Kara spin_unlock(&dq_list_lock); 561884d179dSJan Kara } 562884d179dSJan Kara 563884d179dSJan Kara /* Call callback for every active dquot on given filesystem */ 564884d179dSJan Kara int dquot_scan_active(struct super_block *sb, 565884d179dSJan Kara int (*fn)(struct dquot *dquot, unsigned long priv), 566884d179dSJan Kara unsigned long priv) 567884d179dSJan Kara { 568884d179dSJan Kara struct dquot *dquot, *old_dquot = NULL; 569884d179dSJan Kara int ret = 0; 570884d179dSJan Kara 571884d179dSJan Kara mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); 572884d179dSJan Kara spin_lock(&dq_list_lock); 573884d179dSJan Kara list_for_each_entry(dquot, &inuse_list, dq_inuse) { 574884d179dSJan Kara if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) 575884d179dSJan Kara continue; 576884d179dSJan Kara if (dquot->dq_sb != sb) 577884d179dSJan Kara continue; 578884d179dSJan Kara /* Now we have active dquot so we can just increase use count */ 579884d179dSJan Kara atomic_inc(&dquot->dq_count); 580884d179dSJan Kara spin_unlock(&dq_list_lock); 581dde95888SDmitry Monakhov dqstats_inc(DQST_LOOKUPS); 582884d179dSJan Kara dqput(old_dquot); 583884d179dSJan Kara old_dquot = dquot; 5841362f4eaSJan Kara /* 5851362f4eaSJan Kara * ->release_dquot() can be racing with us. Our reference 5861362f4eaSJan Kara * protects us from new calls to it so just wait for any 5871362f4eaSJan Kara * outstanding call and recheck the DQ_ACTIVE_B after that. 5881362f4eaSJan Kara */ 5891362f4eaSJan Kara wait_on_dquot(dquot); 5901362f4eaSJan Kara if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { 591884d179dSJan Kara ret = fn(dquot, priv); 592884d179dSJan Kara if (ret < 0) 593884d179dSJan Kara goto out; 5941362f4eaSJan Kara } 595884d179dSJan Kara spin_lock(&dq_list_lock); 596884d179dSJan Kara /* We are safe to continue now because our dquot could not 597884d179dSJan Kara * be moved out of the inuse list while we hold the reference */ 598884d179dSJan Kara } 599884d179dSJan Kara spin_unlock(&dq_list_lock); 600884d179dSJan Kara out: 601884d179dSJan Kara dqput(old_dquot); 602884d179dSJan Kara mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); 603884d179dSJan Kara return ret; 604884d179dSJan Kara } 605884d179dSJan Kara EXPORT_SYMBOL(dquot_scan_active); 606884d179dSJan Kara 607ceed1723SJan Kara /* Write all dquot structures to quota files */ 608ceed1723SJan Kara int dquot_writeback_dquots(struct super_block *sb, int type) 609884d179dSJan Kara { 610884d179dSJan Kara struct list_head *dirty; 611884d179dSJan Kara struct dquot *dquot; 612884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 613884d179dSJan Kara int cnt; 614ceed1723SJan Kara int err, ret = 0; 615884d179dSJan Kara 616884d179dSJan Kara mutex_lock(&dqopt->dqonoff_mutex); 617884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 618884d179dSJan Kara if (type != -1 && cnt != type) 619884d179dSJan Kara continue; 620884d179dSJan Kara if (!sb_has_quota_active(sb, cnt)) 621884d179dSJan Kara continue; 622884d179dSJan Kara spin_lock(&dq_list_lock); 623884d179dSJan Kara dirty = &dqopt->info[cnt].dqi_dirty_list; 624884d179dSJan Kara while (!list_empty(dirty)) { 625268157baSJan Kara dquot = list_first_entry(dirty, struct dquot, 626268157baSJan Kara dq_dirty); 627884d179dSJan Kara /* Dirty and inactive can be only bad dquot... */ 628884d179dSJan Kara if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { 629884d179dSJan Kara clear_dquot_dirty(dquot); 630884d179dSJan Kara continue; 631884d179dSJan Kara } 632884d179dSJan Kara /* Now we have active dquot from which someone is 633884d179dSJan Kara * holding reference so we can safely just increase 634884d179dSJan Kara * use count */ 6359f985cb6SJan Kara dqgrab(dquot); 636884d179dSJan Kara spin_unlock(&dq_list_lock); 637dde95888SDmitry Monakhov dqstats_inc(DQST_LOOKUPS); 638ceed1723SJan Kara err = sb->dq_op->write_dquot(dquot); 639ceed1723SJan Kara if (!ret && err) 640ceed1723SJan Kara err = ret; 641884d179dSJan Kara dqput(dquot); 642884d179dSJan Kara spin_lock(&dq_list_lock); 643884d179dSJan Kara } 644884d179dSJan Kara spin_unlock(&dq_list_lock); 645884d179dSJan Kara } 646884d179dSJan Kara 647884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 648884d179dSJan Kara if ((cnt == type || type == -1) && sb_has_quota_active(sb, cnt) 649884d179dSJan Kara && info_dirty(&dqopt->info[cnt])) 650884d179dSJan Kara sb->dq_op->write_info(sb, cnt); 651dde95888SDmitry Monakhov dqstats_inc(DQST_SYNCS); 652884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 653884d179dSJan Kara 654ceed1723SJan Kara return ret; 655ceed1723SJan Kara } 656ceed1723SJan Kara EXPORT_SYMBOL(dquot_writeback_dquots); 657ceed1723SJan Kara 658ceed1723SJan Kara /* Write all dquot structures to disk and make them visible from userspace */ 659ceed1723SJan Kara int dquot_quota_sync(struct super_block *sb, int type) 660ceed1723SJan Kara { 661ceed1723SJan Kara struct quota_info *dqopt = sb_dqopt(sb); 662ceed1723SJan Kara int cnt; 663ceed1723SJan Kara int ret; 664ceed1723SJan Kara 665ceed1723SJan Kara ret = dquot_writeback_dquots(sb, type); 666ceed1723SJan Kara if (ret) 667ceed1723SJan Kara return ret; 668ceed1723SJan Kara if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) 6695fb324adSChristoph Hellwig return 0; 6705fb324adSChristoph Hellwig 6715fb324adSChristoph Hellwig /* This is not very clever (and fast) but currently I don't know about 6725fb324adSChristoph Hellwig * any other simple way of getting quota data to disk and we must get 6735fb324adSChristoph Hellwig * them there for userspace to be visible... */ 6745fb324adSChristoph Hellwig if (sb->s_op->sync_fs) 6755fb324adSChristoph Hellwig sb->s_op->sync_fs(sb, 1); 6765fb324adSChristoph Hellwig sync_blockdev(sb->s_bdev); 6775fb324adSChristoph Hellwig 6785fb324adSChristoph Hellwig /* 6795fb324adSChristoph Hellwig * Now when everything is written we can discard the pagecache so 6805fb324adSChristoph Hellwig * that userspace sees the changes. 6815fb324adSChristoph Hellwig */ 682f9ef1784SJan Kara mutex_lock(&dqopt->dqonoff_mutex); 6835fb324adSChristoph Hellwig for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 6845fb324adSChristoph Hellwig if (type != -1 && cnt != type) 6855fb324adSChristoph Hellwig continue; 6865fb324adSChristoph Hellwig if (!sb_has_quota_active(sb, cnt)) 6875fb324adSChristoph Hellwig continue; 688a80b12c3SJan Kara mutex_lock(&dqopt->files[cnt]->i_mutex); 689f9ef1784SJan Kara truncate_inode_pages(&dqopt->files[cnt]->i_data, 0); 690f9ef1784SJan Kara mutex_unlock(&dqopt->files[cnt]->i_mutex); 6915fb324adSChristoph Hellwig } 692f9ef1784SJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 6935fb324adSChristoph Hellwig 694884d179dSJan Kara return 0; 695884d179dSJan Kara } 696287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_quota_sync); 697884d179dSJan Kara 6981ab6c499SDave Chinner static unsigned long 6991ab6c499SDave Chinner dqcache_shrink_scan(struct shrinker *shrink, struct shrink_control *sc) 700884d179dSJan Kara { 701884d179dSJan Kara struct list_head *head; 702884d179dSJan Kara struct dquot *dquot; 7031ab6c499SDave Chinner unsigned long freed = 0; 704884d179dSJan Kara 705d68aab6bSNiu Yawei spin_lock(&dq_list_lock); 706884d179dSJan Kara head = free_dquots.prev; 7071ab6c499SDave Chinner while (head != &free_dquots && sc->nr_to_scan) { 708884d179dSJan Kara dquot = list_entry(head, struct dquot, dq_free); 709884d179dSJan Kara remove_dquot_hash(dquot); 710884d179dSJan Kara remove_free_dquot(dquot); 711884d179dSJan Kara remove_inuse(dquot); 712884d179dSJan Kara do_destroy_dquot(dquot); 7131ab6c499SDave Chinner sc->nr_to_scan--; 7141ab6c499SDave Chinner freed++; 715884d179dSJan Kara head = free_dquots.prev; 716884d179dSJan Kara } 717d68aab6bSNiu Yawei spin_unlock(&dq_list_lock); 7181ab6c499SDave Chinner return freed; 719884d179dSJan Kara } 720884d179dSJan Kara 7211ab6c499SDave Chinner static unsigned long 7221ab6c499SDave Chinner dqcache_shrink_count(struct shrinker *shrink, struct shrink_control *sc) 723884d179dSJan Kara { 72455f841ceSGlauber Costa return vfs_pressure_ratio( 72555f841ceSGlauber Costa percpu_counter_read_positive(&dqstats.counter[DQST_FREE_DQUOTS])); 726884d179dSJan Kara } 727884d179dSJan Kara 728884d179dSJan Kara static struct shrinker dqcache_shrinker = { 7291ab6c499SDave Chinner .count_objects = dqcache_shrink_count, 7301ab6c499SDave Chinner .scan_objects = dqcache_shrink_scan, 731884d179dSJan Kara .seeks = DEFAULT_SEEKS, 732884d179dSJan Kara }; 733884d179dSJan Kara 734884d179dSJan Kara /* 735884d179dSJan Kara * Put reference to dquot 736884d179dSJan Kara */ 737884d179dSJan Kara void dqput(struct dquot *dquot) 738884d179dSJan Kara { 739884d179dSJan Kara int ret; 740884d179dSJan Kara 741884d179dSJan Kara if (!dquot) 742884d179dSJan Kara return; 74362af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 744884d179dSJan Kara if (!atomic_read(&dquot->dq_count)) { 745fb5ffb0eSJiaying Zhang quota_error(dquot->dq_sb, "trying to free free dquot of %s %d", 7464c376dcaSEric W. Biederman quotatypes[dquot->dq_id.type], 7474c376dcaSEric W. Biederman from_kqid(&init_user_ns, dquot->dq_id)); 748884d179dSJan Kara BUG(); 749884d179dSJan Kara } 750884d179dSJan Kara #endif 751dde95888SDmitry Monakhov dqstats_inc(DQST_DROPS); 752884d179dSJan Kara we_slept: 753884d179dSJan Kara spin_lock(&dq_list_lock); 754884d179dSJan Kara if (atomic_read(&dquot->dq_count) > 1) { 755884d179dSJan Kara /* We have more than one user... nothing to do */ 756884d179dSJan Kara atomic_dec(&dquot->dq_count); 757884d179dSJan Kara /* Releasing dquot during quotaoff phase? */ 7584c376dcaSEric W. Biederman if (!sb_has_quota_active(dquot->dq_sb, dquot->dq_id.type) && 759884d179dSJan Kara atomic_read(&dquot->dq_count) == 1) 760884d179dSJan Kara wake_up(&dquot->dq_wait_unused); 761884d179dSJan Kara spin_unlock(&dq_list_lock); 762884d179dSJan Kara return; 763884d179dSJan Kara } 764884d179dSJan Kara /* Need to release dquot? */ 765884d179dSJan Kara if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && dquot_dirty(dquot)) { 766884d179dSJan Kara spin_unlock(&dq_list_lock); 767884d179dSJan Kara /* Commit dquot before releasing */ 768884d179dSJan Kara ret = dquot->dq_sb->dq_op->write_dquot(dquot); 769884d179dSJan Kara if (ret < 0) { 770fb5ffb0eSJiaying Zhang quota_error(dquot->dq_sb, "Can't write quota structure" 771fb5ffb0eSJiaying Zhang " (error %d). Quota may get out of sync!", 772fb5ffb0eSJiaying Zhang ret); 773884d179dSJan Kara /* 774884d179dSJan Kara * We clear dirty bit anyway, so that we avoid 775884d179dSJan Kara * infinite loop here 776884d179dSJan Kara */ 777884d179dSJan Kara spin_lock(&dq_list_lock); 778884d179dSJan Kara clear_dquot_dirty(dquot); 779884d179dSJan Kara spin_unlock(&dq_list_lock); 780884d179dSJan Kara } 781884d179dSJan Kara goto we_slept; 782884d179dSJan Kara } 783884d179dSJan Kara /* Clear flag in case dquot was inactive (something bad happened) */ 784884d179dSJan Kara clear_dquot_dirty(dquot); 785884d179dSJan Kara if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { 786884d179dSJan Kara spin_unlock(&dq_list_lock); 787884d179dSJan Kara dquot->dq_sb->dq_op->release_dquot(dquot); 788884d179dSJan Kara goto we_slept; 789884d179dSJan Kara } 790884d179dSJan Kara atomic_dec(&dquot->dq_count); 79162af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 792884d179dSJan Kara /* sanity check */ 793884d179dSJan Kara BUG_ON(!list_empty(&dquot->dq_free)); 794884d179dSJan Kara #endif 795884d179dSJan Kara put_dquot_last(dquot); 796884d179dSJan Kara spin_unlock(&dq_list_lock); 797884d179dSJan Kara } 798884d179dSJan Kara EXPORT_SYMBOL(dqput); 799884d179dSJan Kara 800884d179dSJan Kara struct dquot *dquot_alloc(struct super_block *sb, int type) 801884d179dSJan Kara { 802884d179dSJan Kara return kmem_cache_zalloc(dquot_cachep, GFP_NOFS); 803884d179dSJan Kara } 804884d179dSJan Kara EXPORT_SYMBOL(dquot_alloc); 805884d179dSJan Kara 806884d179dSJan Kara static struct dquot *get_empty_dquot(struct super_block *sb, int type) 807884d179dSJan Kara { 808884d179dSJan Kara struct dquot *dquot; 809884d179dSJan Kara 810884d179dSJan Kara dquot = sb->dq_op->alloc_dquot(sb, type); 811884d179dSJan Kara if(!dquot) 812dd6f3c6dSJan Kara return NULL; 813884d179dSJan Kara 814884d179dSJan Kara mutex_init(&dquot->dq_lock); 815884d179dSJan Kara INIT_LIST_HEAD(&dquot->dq_free); 816884d179dSJan Kara INIT_LIST_HEAD(&dquot->dq_inuse); 817884d179dSJan Kara INIT_HLIST_NODE(&dquot->dq_hash); 818884d179dSJan Kara INIT_LIST_HEAD(&dquot->dq_dirty); 819884d179dSJan Kara init_waitqueue_head(&dquot->dq_wait_unused); 820884d179dSJan Kara dquot->dq_sb = sb; 8211a06d420SEric W. Biederman dquot->dq_id = make_kqid_invalid(type); 822884d179dSJan Kara atomic_set(&dquot->dq_count, 1); 823884d179dSJan Kara 824884d179dSJan Kara return dquot; 825884d179dSJan Kara } 826884d179dSJan Kara 827884d179dSJan Kara /* 828884d179dSJan Kara * Get reference to dquot 829884d179dSJan Kara * 830884d179dSJan Kara * Locking is slightly tricky here. We are guarded from parallel quotaoff() 831884d179dSJan Kara * destroying our dquot by: 832884d179dSJan Kara * a) checking for quota flags under dq_list_lock and 833884d179dSJan Kara * b) getting a reference to dquot before we release dq_list_lock 834884d179dSJan Kara */ 835aca645a6SEric W. Biederman struct dquot *dqget(struct super_block *sb, struct kqid qid) 836884d179dSJan Kara { 8371a06d420SEric W. Biederman unsigned int hashent = hashfn(sb, qid); 838dd6f3c6dSJan Kara struct dquot *dquot = NULL, *empty = NULL; 839884d179dSJan Kara 8401a06d420SEric W. Biederman if (!sb_has_quota_active(sb, qid.type)) 841dd6f3c6dSJan Kara return NULL; 842884d179dSJan Kara we_slept: 843884d179dSJan Kara spin_lock(&dq_list_lock); 844884d179dSJan Kara spin_lock(&dq_state_lock); 8451a06d420SEric W. Biederman if (!sb_has_quota_active(sb, qid.type)) { 846884d179dSJan Kara spin_unlock(&dq_state_lock); 847884d179dSJan Kara spin_unlock(&dq_list_lock); 848884d179dSJan Kara goto out; 849884d179dSJan Kara } 850884d179dSJan Kara spin_unlock(&dq_state_lock); 851884d179dSJan Kara 8521a06d420SEric W. Biederman dquot = find_dquot(hashent, sb, qid); 853dd6f3c6dSJan Kara if (!dquot) { 854dd6f3c6dSJan Kara if (!empty) { 855884d179dSJan Kara spin_unlock(&dq_list_lock); 8561a06d420SEric W. Biederman empty = get_empty_dquot(sb, qid.type); 857dd6f3c6dSJan Kara if (!empty) 858884d179dSJan Kara schedule(); /* Try to wait for a moment... */ 859884d179dSJan Kara goto we_slept; 860884d179dSJan Kara } 861884d179dSJan Kara dquot = empty; 862dd6f3c6dSJan Kara empty = NULL; 8634c376dcaSEric W. Biederman dquot->dq_id = qid; 864884d179dSJan Kara /* all dquots go on the inuse_list */ 865884d179dSJan Kara put_inuse(dquot); 866884d179dSJan Kara /* hash it first so it can be found */ 867884d179dSJan Kara insert_dquot_hash(dquot); 868884d179dSJan Kara spin_unlock(&dq_list_lock); 869dde95888SDmitry Monakhov dqstats_inc(DQST_LOOKUPS); 870884d179dSJan Kara } else { 871884d179dSJan Kara if (!atomic_read(&dquot->dq_count)) 872884d179dSJan Kara remove_free_dquot(dquot); 873884d179dSJan Kara atomic_inc(&dquot->dq_count); 874884d179dSJan Kara spin_unlock(&dq_list_lock); 875dde95888SDmitry Monakhov dqstats_inc(DQST_CACHE_HITS); 876dde95888SDmitry Monakhov dqstats_inc(DQST_LOOKUPS); 877884d179dSJan Kara } 878268157baSJan Kara /* Wait for dq_lock - after this we know that either dquot_release() is 879268157baSJan Kara * already finished or it will be canceled due to dq_count > 1 test */ 880884d179dSJan Kara wait_on_dquot(dquot); 881268157baSJan Kara /* Read the dquot / allocate space in quota file */ 882268157baSJan Kara if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && 883268157baSJan Kara sb->dq_op->acquire_dquot(dquot) < 0) { 884884d179dSJan Kara dqput(dquot); 885dd6f3c6dSJan Kara dquot = NULL; 886884d179dSJan Kara goto out; 887884d179dSJan Kara } 88862af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 889884d179dSJan Kara BUG_ON(!dquot->dq_sb); /* Has somebody invalidated entry under us? */ 890884d179dSJan Kara #endif 891884d179dSJan Kara out: 892884d179dSJan Kara if (empty) 893884d179dSJan Kara do_destroy_dquot(empty); 894884d179dSJan Kara 895884d179dSJan Kara return dquot; 896884d179dSJan Kara } 897884d179dSJan Kara EXPORT_SYMBOL(dqget); 898884d179dSJan Kara 899884d179dSJan Kara static int dqinit_needed(struct inode *inode, int type) 900884d179dSJan Kara { 901884d179dSJan Kara int cnt; 902884d179dSJan Kara 903884d179dSJan Kara if (IS_NOQUOTA(inode)) 904884d179dSJan Kara return 0; 905884d179dSJan Kara if (type != -1) 906dd6f3c6dSJan Kara return !inode->i_dquot[type]; 907884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 908dd6f3c6dSJan Kara if (!inode->i_dquot[cnt]) 909884d179dSJan Kara return 1; 910884d179dSJan Kara return 0; 911884d179dSJan Kara } 912884d179dSJan Kara 913884d179dSJan Kara /* This routine is guarded by dqonoff_mutex mutex */ 914884d179dSJan Kara static void add_dquot_ref(struct super_block *sb, int type) 915884d179dSJan Kara { 916884d179dSJan Kara struct inode *inode, *old_inode = NULL; 91762af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 9180a5a9c72SJan Kara int reserved = 0; 9194c5e6c0eSJan Kara #endif 920884d179dSJan Kara 92155fa6091SDave Chinner spin_lock(&inode_sb_list_lock); 922884d179dSJan Kara list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { 923250df6edSDave Chinner spin_lock(&inode->i_lock); 924250df6edSDave Chinner if ((inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW)) || 925250df6edSDave Chinner !atomic_read(&inode->i_writecount) || 926250df6edSDave Chinner !dqinit_needed(inode, type)) { 927250df6edSDave Chinner spin_unlock(&inode->i_lock); 9283ae5080fSLinus Torvalds continue; 929250df6edSDave Chinner } 930884d179dSJan Kara __iget(inode); 931250df6edSDave Chinner spin_unlock(&inode->i_lock); 93255fa6091SDave Chinner spin_unlock(&inode_sb_list_lock); 933884d179dSJan Kara 934d7e97117SJan Kara #ifdef CONFIG_QUOTA_DEBUG 935d7e97117SJan Kara if (unlikely(inode_get_rsv_space(inode) > 0)) 936d7e97117SJan Kara reserved = 1; 937d7e97117SJan Kara #endif 938884d179dSJan Kara iput(old_inode); 939871a2931SChristoph Hellwig __dquot_initialize(inode, type); 94055fa6091SDave Chinner 94155fa6091SDave Chinner /* 94255fa6091SDave Chinner * We hold a reference to 'inode' so it couldn't have been 94355fa6091SDave Chinner * removed from s_inodes list while we dropped the 94455fa6091SDave Chinner * inode_sb_list_lock We cannot iput the inode now as we can be 94555fa6091SDave Chinner * holding the last reference and we cannot iput it under 94655fa6091SDave Chinner * inode_sb_list_lock. So we keep the reference and iput it 94755fa6091SDave Chinner * later. 94855fa6091SDave Chinner */ 949884d179dSJan Kara old_inode = inode; 95055fa6091SDave Chinner spin_lock(&inode_sb_list_lock); 951884d179dSJan Kara } 95255fa6091SDave Chinner spin_unlock(&inode_sb_list_lock); 953884d179dSJan Kara iput(old_inode); 9540a5a9c72SJan Kara 95562af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 9560a5a9c72SJan Kara if (reserved) { 957fb5ffb0eSJiaying Zhang quota_error(sb, "Writes happened before quota was turned on " 958fb5ffb0eSJiaying Zhang "thus quota information is probably inconsistent. " 959fb5ffb0eSJiaying Zhang "Please run quotacheck(8)"); 9600a5a9c72SJan Kara } 9614c5e6c0eSJan Kara #endif 962884d179dSJan Kara } 963884d179dSJan Kara 964268157baSJan Kara /* 965268157baSJan Kara * Remove references to dquots from inode and add dquot to list for freeing 96625985edcSLucas De Marchi * if we have the last reference to dquot 967268157baSJan Kara * We can't race with anybody because we hold dqptr_sem for writing... 968268157baSJan Kara */ 969*9eb6463fSNiu Yawei static void remove_inode_dquot_ref(struct inode *inode, int type, 970884d179dSJan Kara struct list_head *tofree_head) 971884d179dSJan Kara { 972884d179dSJan Kara struct dquot *dquot = inode->i_dquot[type]; 973884d179dSJan Kara 974dd6f3c6dSJan Kara inode->i_dquot[type] = NULL; 975*9eb6463fSNiu Yawei if (!dquot) 976*9eb6463fSNiu Yawei return; 977*9eb6463fSNiu Yawei 978*9eb6463fSNiu Yawei if (list_empty(&dquot->dq_free)) { 979*9eb6463fSNiu Yawei /* 980*9eb6463fSNiu Yawei * The inode still has reference to dquot so it can't be in the 981*9eb6463fSNiu Yawei * free list 982*9eb6463fSNiu Yawei */ 983884d179dSJan Kara spin_lock(&dq_list_lock); 984268157baSJan Kara list_add(&dquot->dq_free, tofree_head); 985884d179dSJan Kara spin_unlock(&dq_list_lock); 986*9eb6463fSNiu Yawei } else { 987*9eb6463fSNiu Yawei /* 988*9eb6463fSNiu Yawei * Dquot is already in a list to put so we won't drop the last 989*9eb6463fSNiu Yawei * reference here. 990*9eb6463fSNiu Yawei */ 991*9eb6463fSNiu Yawei dqput(dquot); 992884d179dSJan Kara } 993884d179dSJan Kara } 994884d179dSJan Kara 995268157baSJan Kara /* 996268157baSJan Kara * Free list of dquots 997268157baSJan Kara * Dquots are removed from inodes and no new references can be got so we are 998268157baSJan Kara * the only ones holding reference 999268157baSJan Kara */ 1000884d179dSJan Kara static void put_dquot_list(struct list_head *tofree_head) 1001884d179dSJan Kara { 1002884d179dSJan Kara struct list_head *act_head; 1003884d179dSJan Kara struct dquot *dquot; 1004884d179dSJan Kara 1005884d179dSJan Kara act_head = tofree_head->next; 1006884d179dSJan Kara while (act_head != tofree_head) { 1007884d179dSJan Kara dquot = list_entry(act_head, struct dquot, dq_free); 1008884d179dSJan Kara act_head = act_head->next; 1009268157baSJan Kara /* Remove dquot from the list so we won't have problems... */ 1010268157baSJan Kara list_del_init(&dquot->dq_free); 1011884d179dSJan Kara dqput(dquot); 1012884d179dSJan Kara } 1013884d179dSJan Kara } 1014884d179dSJan Kara 1015884d179dSJan Kara static void remove_dquot_ref(struct super_block *sb, int type, 1016884d179dSJan Kara struct list_head *tofree_head) 1017884d179dSJan Kara { 1018884d179dSJan Kara struct inode *inode; 10197af9cce8SDmitry Monakhov int reserved = 0; 1020884d179dSJan Kara 102155fa6091SDave Chinner spin_lock(&inode_sb_list_lock); 1022884d179dSJan Kara list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { 10233ae5080fSLinus Torvalds /* 10243ae5080fSLinus Torvalds * We have to scan also I_NEW inodes because they can already 10253ae5080fSLinus Torvalds * have quota pointer initialized. Luckily, we need to touch 10263ae5080fSLinus Torvalds * only quota pointers and these have separate locking 10273ae5080fSLinus Torvalds * (dqptr_sem). 10283ae5080fSLinus Torvalds */ 10297af9cce8SDmitry Monakhov if (!IS_NOQUOTA(inode)) { 10307af9cce8SDmitry Monakhov if (unlikely(inode_get_rsv_space(inode) > 0)) 10317af9cce8SDmitry Monakhov reserved = 1; 1032884d179dSJan Kara remove_inode_dquot_ref(inode, type, tofree_head); 1033884d179dSJan Kara } 10347af9cce8SDmitry Monakhov } 103555fa6091SDave Chinner spin_unlock(&inode_sb_list_lock); 10367af9cce8SDmitry Monakhov #ifdef CONFIG_QUOTA_DEBUG 10377af9cce8SDmitry Monakhov if (reserved) { 10387af9cce8SDmitry Monakhov printk(KERN_WARNING "VFS (%s): Writes happened after quota" 10397af9cce8SDmitry Monakhov " was disabled thus quota information is probably " 10407af9cce8SDmitry Monakhov "inconsistent. Please run quotacheck(8).\n", sb->s_id); 10417af9cce8SDmitry Monakhov } 10427af9cce8SDmitry Monakhov #endif 1043884d179dSJan Kara } 1044884d179dSJan Kara 1045884d179dSJan Kara /* Gather all references from inodes and drop them */ 1046884d179dSJan Kara static void drop_dquot_ref(struct super_block *sb, int type) 1047884d179dSJan Kara { 1048884d179dSJan Kara LIST_HEAD(tofree_head); 1049884d179dSJan Kara 1050884d179dSJan Kara if (sb->dq_op) { 1051884d179dSJan Kara down_write(&sb_dqopt(sb)->dqptr_sem); 1052884d179dSJan Kara remove_dquot_ref(sb, type, &tofree_head); 1053884d179dSJan Kara up_write(&sb_dqopt(sb)->dqptr_sem); 1054884d179dSJan Kara put_dquot_list(&tofree_head); 1055884d179dSJan Kara } 1056884d179dSJan Kara } 1057884d179dSJan Kara 1058884d179dSJan Kara static inline void dquot_incr_inodes(struct dquot *dquot, qsize_t number) 1059884d179dSJan Kara { 1060884d179dSJan Kara dquot->dq_dqb.dqb_curinodes += number; 1061884d179dSJan Kara } 1062884d179dSJan Kara 1063884d179dSJan Kara static inline void dquot_incr_space(struct dquot *dquot, qsize_t number) 1064884d179dSJan Kara { 1065884d179dSJan Kara dquot->dq_dqb.dqb_curspace += number; 1066884d179dSJan Kara } 1067884d179dSJan Kara 1068884d179dSJan Kara static inline void dquot_resv_space(struct dquot *dquot, qsize_t number) 1069884d179dSJan Kara { 1070884d179dSJan Kara dquot->dq_dqb.dqb_rsvspace += number; 1071884d179dSJan Kara } 1072884d179dSJan Kara 1073884d179dSJan Kara /* 1074884d179dSJan Kara * Claim reserved quota space 1075884d179dSJan Kara */ 10760a5a9c72SJan Kara static void dquot_claim_reserved_space(struct dquot *dquot, qsize_t number) 1077884d179dSJan Kara { 10780a5a9c72SJan Kara if (dquot->dq_dqb.dqb_rsvspace < number) { 10790a5a9c72SJan Kara WARN_ON_ONCE(1); 10800a5a9c72SJan Kara number = dquot->dq_dqb.dqb_rsvspace; 10810a5a9c72SJan Kara } 1082884d179dSJan Kara dquot->dq_dqb.dqb_curspace += number; 1083884d179dSJan Kara dquot->dq_dqb.dqb_rsvspace -= number; 1084884d179dSJan Kara } 1085884d179dSJan Kara 10861c8924ebSJan Kara static void dquot_reclaim_reserved_space(struct dquot *dquot, qsize_t number) 10871c8924ebSJan Kara { 10881c8924ebSJan Kara if (WARN_ON_ONCE(dquot->dq_dqb.dqb_curspace < number)) 10891c8924ebSJan Kara number = dquot->dq_dqb.dqb_curspace; 10901c8924ebSJan Kara dquot->dq_dqb.dqb_rsvspace += number; 10911c8924ebSJan Kara dquot->dq_dqb.dqb_curspace -= number; 10921c8924ebSJan Kara } 10931c8924ebSJan Kara 1094884d179dSJan Kara static inline 1095884d179dSJan Kara void dquot_free_reserved_space(struct dquot *dquot, qsize_t number) 1096884d179dSJan Kara { 10970a5a9c72SJan Kara if (dquot->dq_dqb.dqb_rsvspace >= number) 1098884d179dSJan Kara dquot->dq_dqb.dqb_rsvspace -= number; 10990a5a9c72SJan Kara else { 11000a5a9c72SJan Kara WARN_ON_ONCE(1); 11010a5a9c72SJan Kara dquot->dq_dqb.dqb_rsvspace = 0; 11020a5a9c72SJan Kara } 1103884d179dSJan Kara } 1104884d179dSJan Kara 11057a2435d8SJan Kara static void dquot_decr_inodes(struct dquot *dquot, qsize_t number) 1106884d179dSJan Kara { 1107884d179dSJan Kara if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE || 1108884d179dSJan Kara dquot->dq_dqb.dqb_curinodes >= number) 1109884d179dSJan Kara dquot->dq_dqb.dqb_curinodes -= number; 1110884d179dSJan Kara else 1111884d179dSJan Kara dquot->dq_dqb.dqb_curinodes = 0; 1112884d179dSJan Kara if (dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit) 1113884d179dSJan Kara dquot->dq_dqb.dqb_itime = (time_t) 0; 1114884d179dSJan Kara clear_bit(DQ_INODES_B, &dquot->dq_flags); 1115884d179dSJan Kara } 1116884d179dSJan Kara 11177a2435d8SJan Kara static void dquot_decr_space(struct dquot *dquot, qsize_t number) 1118884d179dSJan Kara { 1119884d179dSJan Kara if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE || 1120884d179dSJan Kara dquot->dq_dqb.dqb_curspace >= number) 1121884d179dSJan Kara dquot->dq_dqb.dqb_curspace -= number; 1122884d179dSJan Kara else 1123884d179dSJan Kara dquot->dq_dqb.dqb_curspace = 0; 1124884d179dSJan Kara if (dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit) 1125884d179dSJan Kara dquot->dq_dqb.dqb_btime = (time_t) 0; 1126884d179dSJan Kara clear_bit(DQ_BLKS_B, &dquot->dq_flags); 1127884d179dSJan Kara } 1128884d179dSJan Kara 1129bf097aafSJan Kara struct dquot_warn { 1130bf097aafSJan Kara struct super_block *w_sb; 11317b9c7321SEric W. Biederman struct kqid w_dq_id; 1132bf097aafSJan Kara short w_type; 1133bf097aafSJan Kara }; 1134bf097aafSJan Kara 1135884d179dSJan Kara static int warning_issued(struct dquot *dquot, const int warntype) 1136884d179dSJan Kara { 1137884d179dSJan Kara int flag = (warntype == QUOTA_NL_BHARDWARN || 1138884d179dSJan Kara warntype == QUOTA_NL_BSOFTLONGWARN) ? DQ_BLKS_B : 1139884d179dSJan Kara ((warntype == QUOTA_NL_IHARDWARN || 1140884d179dSJan Kara warntype == QUOTA_NL_ISOFTLONGWARN) ? DQ_INODES_B : 0); 1141884d179dSJan Kara 1142884d179dSJan Kara if (!flag) 1143884d179dSJan Kara return 0; 1144884d179dSJan Kara return test_and_set_bit(flag, &dquot->dq_flags); 1145884d179dSJan Kara } 1146884d179dSJan Kara 1147884d179dSJan Kara #ifdef CONFIG_PRINT_QUOTA_WARNING 1148884d179dSJan Kara static int flag_print_warnings = 1; 1149884d179dSJan Kara 1150bf097aafSJan Kara static int need_print_warning(struct dquot_warn *warn) 1151884d179dSJan Kara { 1152884d179dSJan Kara if (!flag_print_warnings) 1153884d179dSJan Kara return 0; 1154884d179dSJan Kara 11557b9c7321SEric W. Biederman switch (warn->w_dq_id.type) { 1156884d179dSJan Kara case USRQUOTA: 11571a06d420SEric W. Biederman return uid_eq(current_fsuid(), warn->w_dq_id.uid); 1158884d179dSJan Kara case GRPQUOTA: 11597b9c7321SEric W. Biederman return in_group_p(warn->w_dq_id.gid); 11606c29c50fSJan Kara case PRJQUOTA: /* Never taken... Just make gcc happy */ 11616c29c50fSJan Kara return 0; 1162884d179dSJan Kara } 1163884d179dSJan Kara return 0; 1164884d179dSJan Kara } 1165884d179dSJan Kara 1166884d179dSJan Kara /* Print warning to user which exceeded quota */ 1167bf097aafSJan Kara static void print_warning(struct dquot_warn *warn) 1168884d179dSJan Kara { 1169884d179dSJan Kara char *msg = NULL; 1170884d179dSJan Kara struct tty_struct *tty; 1171bf097aafSJan Kara int warntype = warn->w_type; 1172884d179dSJan Kara 1173884d179dSJan Kara if (warntype == QUOTA_NL_IHARDBELOW || 1174884d179dSJan Kara warntype == QUOTA_NL_ISOFTBELOW || 1175884d179dSJan Kara warntype == QUOTA_NL_BHARDBELOW || 1176bf097aafSJan Kara warntype == QUOTA_NL_BSOFTBELOW || !need_print_warning(warn)) 1177884d179dSJan Kara return; 1178884d179dSJan Kara 1179884d179dSJan Kara tty = get_current_tty(); 1180884d179dSJan Kara if (!tty) 1181884d179dSJan Kara return; 1182bf097aafSJan Kara tty_write_message(tty, warn->w_sb->s_id); 1183884d179dSJan Kara if (warntype == QUOTA_NL_ISOFTWARN || warntype == QUOTA_NL_BSOFTWARN) 1184884d179dSJan Kara tty_write_message(tty, ": warning, "); 1185884d179dSJan Kara else 1186884d179dSJan Kara tty_write_message(tty, ": write failed, "); 11877b9c7321SEric W. Biederman tty_write_message(tty, quotatypes[warn->w_dq_id.type]); 1188884d179dSJan Kara switch (warntype) { 1189884d179dSJan Kara case QUOTA_NL_IHARDWARN: 1190884d179dSJan Kara msg = " file limit reached.\r\n"; 1191884d179dSJan Kara break; 1192884d179dSJan Kara case QUOTA_NL_ISOFTLONGWARN: 1193884d179dSJan Kara msg = " file quota exceeded too long.\r\n"; 1194884d179dSJan Kara break; 1195884d179dSJan Kara case QUOTA_NL_ISOFTWARN: 1196884d179dSJan Kara msg = " file quota exceeded.\r\n"; 1197884d179dSJan Kara break; 1198884d179dSJan Kara case QUOTA_NL_BHARDWARN: 1199884d179dSJan Kara msg = " block limit reached.\r\n"; 1200884d179dSJan Kara break; 1201884d179dSJan Kara case QUOTA_NL_BSOFTLONGWARN: 1202884d179dSJan Kara msg = " block quota exceeded too long.\r\n"; 1203884d179dSJan Kara break; 1204884d179dSJan Kara case QUOTA_NL_BSOFTWARN: 1205884d179dSJan Kara msg = " block quota exceeded.\r\n"; 1206884d179dSJan Kara break; 1207884d179dSJan Kara } 1208884d179dSJan Kara tty_write_message(tty, msg); 1209884d179dSJan Kara tty_kref_put(tty); 1210884d179dSJan Kara } 1211884d179dSJan Kara #endif 1212884d179dSJan Kara 1213bf097aafSJan Kara static void prepare_warning(struct dquot_warn *warn, struct dquot *dquot, 1214bf097aafSJan Kara int warntype) 1215bf097aafSJan Kara { 1216bf097aafSJan Kara if (warning_issued(dquot, warntype)) 1217bf097aafSJan Kara return; 1218bf097aafSJan Kara warn->w_type = warntype; 1219bf097aafSJan Kara warn->w_sb = dquot->dq_sb; 1220bf097aafSJan Kara warn->w_dq_id = dquot->dq_id; 1221bf097aafSJan Kara } 1222bf097aafSJan Kara 1223884d179dSJan Kara /* 1224884d179dSJan Kara * Write warnings to the console and send warning messages over netlink. 1225884d179dSJan Kara * 1226bf097aafSJan Kara * Note that this function can call into tty and networking code. 1227884d179dSJan Kara */ 1228bf097aafSJan Kara static void flush_warnings(struct dquot_warn *warn) 1229884d179dSJan Kara { 1230884d179dSJan Kara int i; 1231884d179dSJan Kara 123286e931a3SSteven Whitehouse for (i = 0; i < MAXQUOTAS; i++) { 1233bf097aafSJan Kara if (warn[i].w_type == QUOTA_NL_NOWARN) 1234bf097aafSJan Kara continue; 1235884d179dSJan Kara #ifdef CONFIG_PRINT_QUOTA_WARNING 1236bf097aafSJan Kara print_warning(&warn[i]); 1237884d179dSJan Kara #endif 12387b9c7321SEric W. Biederman quota_send_warning(warn[i].w_dq_id, 1239bf097aafSJan Kara warn[i].w_sb->s_dev, warn[i].w_type); 1240884d179dSJan Kara } 1241884d179dSJan Kara } 1242884d179dSJan Kara 12437a2435d8SJan Kara static int ignore_hardlimit(struct dquot *dquot) 1244884d179dSJan Kara { 12454c376dcaSEric W. Biederman struct mem_dqinfo *info = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_id.type]; 1246884d179dSJan Kara 1247884d179dSJan Kara return capable(CAP_SYS_RESOURCE) && 1248268157baSJan Kara (info->dqi_format->qf_fmt_id != QFMT_VFS_OLD || 1249268157baSJan Kara !(info->dqi_flags & V1_DQF_RSQUASH)); 1250884d179dSJan Kara } 1251884d179dSJan Kara 1252884d179dSJan Kara /* needs dq_data_lock */ 1253bf097aafSJan Kara static int check_idq(struct dquot *dquot, qsize_t inodes, 1254bf097aafSJan Kara struct dquot_warn *warn) 1255884d179dSJan Kara { 1256268157baSJan Kara qsize_t newinodes = dquot->dq_dqb.dqb_curinodes + inodes; 1257268157baSJan Kara 12584c376dcaSEric W. Biederman if (!sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_id.type) || 1259884d179dSJan Kara test_bit(DQ_FAKE_B, &dquot->dq_flags)) 1260efd8f0e6SChristoph Hellwig return 0; 1261884d179dSJan Kara 1262884d179dSJan Kara if (dquot->dq_dqb.dqb_ihardlimit && 1263268157baSJan Kara newinodes > dquot->dq_dqb.dqb_ihardlimit && 1264884d179dSJan Kara !ignore_hardlimit(dquot)) { 1265bf097aafSJan Kara prepare_warning(warn, dquot, QUOTA_NL_IHARDWARN); 1266efd8f0e6SChristoph Hellwig return -EDQUOT; 1267884d179dSJan Kara } 1268884d179dSJan Kara 1269884d179dSJan Kara if (dquot->dq_dqb.dqb_isoftlimit && 1270268157baSJan Kara newinodes > dquot->dq_dqb.dqb_isoftlimit && 1271268157baSJan Kara dquot->dq_dqb.dqb_itime && 1272268157baSJan Kara get_seconds() >= dquot->dq_dqb.dqb_itime && 1273884d179dSJan Kara !ignore_hardlimit(dquot)) { 1274bf097aafSJan Kara prepare_warning(warn, dquot, QUOTA_NL_ISOFTLONGWARN); 1275efd8f0e6SChristoph Hellwig return -EDQUOT; 1276884d179dSJan Kara } 1277884d179dSJan Kara 1278884d179dSJan Kara if (dquot->dq_dqb.dqb_isoftlimit && 1279268157baSJan Kara newinodes > dquot->dq_dqb.dqb_isoftlimit && 1280884d179dSJan Kara dquot->dq_dqb.dqb_itime == 0) { 1281bf097aafSJan Kara prepare_warning(warn, dquot, QUOTA_NL_ISOFTWARN); 1282268157baSJan Kara dquot->dq_dqb.dqb_itime = get_seconds() + 12834c376dcaSEric W. Biederman sb_dqopt(dquot->dq_sb)->info[dquot->dq_id.type].dqi_igrace; 1284884d179dSJan Kara } 1285884d179dSJan Kara 1286efd8f0e6SChristoph Hellwig return 0; 1287884d179dSJan Kara } 1288884d179dSJan Kara 1289884d179dSJan Kara /* needs dq_data_lock */ 1290bf097aafSJan Kara static int check_bdq(struct dquot *dquot, qsize_t space, int prealloc, 1291bf097aafSJan Kara struct dquot_warn *warn) 1292884d179dSJan Kara { 1293884d179dSJan Kara qsize_t tspace; 1294268157baSJan Kara struct super_block *sb = dquot->dq_sb; 1295884d179dSJan Kara 12964c376dcaSEric W. Biederman if (!sb_has_quota_limits_enabled(sb, dquot->dq_id.type) || 1297884d179dSJan Kara test_bit(DQ_FAKE_B, &dquot->dq_flags)) 1298efd8f0e6SChristoph Hellwig return 0; 1299884d179dSJan Kara 1300884d179dSJan Kara tspace = dquot->dq_dqb.dqb_curspace + dquot->dq_dqb.dqb_rsvspace 1301884d179dSJan Kara + space; 1302884d179dSJan Kara 1303884d179dSJan Kara if (dquot->dq_dqb.dqb_bhardlimit && 1304884d179dSJan Kara tspace > dquot->dq_dqb.dqb_bhardlimit && 1305884d179dSJan Kara !ignore_hardlimit(dquot)) { 1306884d179dSJan Kara if (!prealloc) 1307bf097aafSJan Kara prepare_warning(warn, dquot, QUOTA_NL_BHARDWARN); 1308efd8f0e6SChristoph Hellwig return -EDQUOT; 1309884d179dSJan Kara } 1310884d179dSJan Kara 1311884d179dSJan Kara if (dquot->dq_dqb.dqb_bsoftlimit && 1312884d179dSJan Kara tspace > dquot->dq_dqb.dqb_bsoftlimit && 1313268157baSJan Kara dquot->dq_dqb.dqb_btime && 1314268157baSJan Kara get_seconds() >= dquot->dq_dqb.dqb_btime && 1315884d179dSJan Kara !ignore_hardlimit(dquot)) { 1316884d179dSJan Kara if (!prealloc) 1317bf097aafSJan Kara prepare_warning(warn, dquot, QUOTA_NL_BSOFTLONGWARN); 1318efd8f0e6SChristoph Hellwig return -EDQUOT; 1319884d179dSJan Kara } 1320884d179dSJan Kara 1321884d179dSJan Kara if (dquot->dq_dqb.dqb_bsoftlimit && 1322884d179dSJan Kara tspace > dquot->dq_dqb.dqb_bsoftlimit && 1323884d179dSJan Kara dquot->dq_dqb.dqb_btime == 0) { 1324884d179dSJan Kara if (!prealloc) { 1325bf097aafSJan Kara prepare_warning(warn, dquot, QUOTA_NL_BSOFTWARN); 1326268157baSJan Kara dquot->dq_dqb.dqb_btime = get_seconds() + 13274c376dcaSEric W. Biederman sb_dqopt(sb)->info[dquot->dq_id.type].dqi_bgrace; 1328884d179dSJan Kara } 1329884d179dSJan Kara else 1330884d179dSJan Kara /* 1331884d179dSJan Kara * We don't allow preallocation to exceed softlimit so exceeding will 1332884d179dSJan Kara * be always printed 1333884d179dSJan Kara */ 1334efd8f0e6SChristoph Hellwig return -EDQUOT; 1335884d179dSJan Kara } 1336884d179dSJan Kara 1337efd8f0e6SChristoph Hellwig return 0; 1338884d179dSJan Kara } 1339884d179dSJan Kara 1340884d179dSJan Kara static int info_idq_free(struct dquot *dquot, qsize_t inodes) 1341884d179dSJan Kara { 1342268157baSJan Kara qsize_t newinodes; 1343268157baSJan Kara 1344884d179dSJan Kara if (test_bit(DQ_FAKE_B, &dquot->dq_flags) || 1345884d179dSJan Kara dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit || 13464c376dcaSEric W. Biederman !sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_id.type)) 1347884d179dSJan Kara return QUOTA_NL_NOWARN; 1348884d179dSJan Kara 1349268157baSJan Kara newinodes = dquot->dq_dqb.dqb_curinodes - inodes; 1350268157baSJan Kara if (newinodes <= dquot->dq_dqb.dqb_isoftlimit) 1351884d179dSJan Kara return QUOTA_NL_ISOFTBELOW; 1352884d179dSJan Kara if (dquot->dq_dqb.dqb_curinodes >= dquot->dq_dqb.dqb_ihardlimit && 1353268157baSJan Kara newinodes < dquot->dq_dqb.dqb_ihardlimit) 1354884d179dSJan Kara return QUOTA_NL_IHARDBELOW; 1355884d179dSJan Kara return QUOTA_NL_NOWARN; 1356884d179dSJan Kara } 1357884d179dSJan Kara 1358884d179dSJan Kara static int info_bdq_free(struct dquot *dquot, qsize_t space) 1359884d179dSJan Kara { 1360884d179dSJan Kara if (test_bit(DQ_FAKE_B, &dquot->dq_flags) || 1361884d179dSJan Kara dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit) 1362884d179dSJan Kara return QUOTA_NL_NOWARN; 1363884d179dSJan Kara 1364884d179dSJan Kara if (dquot->dq_dqb.dqb_curspace - space <= dquot->dq_dqb.dqb_bsoftlimit) 1365884d179dSJan Kara return QUOTA_NL_BSOFTBELOW; 1366884d179dSJan Kara if (dquot->dq_dqb.dqb_curspace >= dquot->dq_dqb.dqb_bhardlimit && 1367884d179dSJan Kara dquot->dq_dqb.dqb_curspace - space < dquot->dq_dqb.dqb_bhardlimit) 1368884d179dSJan Kara return QUOTA_NL_BHARDBELOW; 1369884d179dSJan Kara return QUOTA_NL_NOWARN; 1370884d179dSJan Kara } 13710a5a9c72SJan Kara 1372189eef59SChristoph Hellwig static int dquot_active(const struct inode *inode) 1373189eef59SChristoph Hellwig { 1374189eef59SChristoph Hellwig struct super_block *sb = inode->i_sb; 1375189eef59SChristoph Hellwig 1376189eef59SChristoph Hellwig if (IS_NOQUOTA(inode)) 1377189eef59SChristoph Hellwig return 0; 1378189eef59SChristoph Hellwig return sb_any_quota_loaded(sb) & ~sb_any_quota_suspended(sb); 1379189eef59SChristoph Hellwig } 1380189eef59SChristoph Hellwig 1381884d179dSJan Kara /* 1382884d179dSJan Kara * Initialize quota pointers in inode 1383871a2931SChristoph Hellwig * 1384884d179dSJan Kara * We do things in a bit complicated way but by that we avoid calling 1385884d179dSJan Kara * dqget() and thus filesystem callbacks under dqptr_sem. 1386871a2931SChristoph Hellwig * 1387871a2931SChristoph Hellwig * It is better to call this function outside of any transaction as it 1388871a2931SChristoph Hellwig * might need a lot of space in journal for dquot structure allocation. 1389884d179dSJan Kara */ 1390871a2931SChristoph Hellwig static void __dquot_initialize(struct inode *inode, int type) 1391884d179dSJan Kara { 13921ea06becSNiu Yawei int cnt, init_needed = 0; 1393ad1e6e8dSDmitry Monakhov struct dquot *got[MAXQUOTAS]; 1394884d179dSJan Kara struct super_block *sb = inode->i_sb; 13950a5a9c72SJan Kara qsize_t rsv; 1396884d179dSJan Kara 1397884d179dSJan Kara /* First test before acquiring mutex - solves deadlocks when we 1398884d179dSJan Kara * re-enter the quota code and are already holding the mutex */ 1399189eef59SChristoph Hellwig if (!dquot_active(inode)) 1400871a2931SChristoph Hellwig return; 1401884d179dSJan Kara 1402884d179dSJan Kara /* First get references to structures we might need. */ 1403884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1404aca645a6SEric W. Biederman struct kqid qid; 1405ad1e6e8dSDmitry Monakhov got[cnt] = NULL; 1406884d179dSJan Kara if (type != -1 && cnt != type) 1407884d179dSJan Kara continue; 14081ea06becSNiu Yawei /* 14091ea06becSNiu Yawei * The i_dquot should have been initialized in most cases, 14101ea06becSNiu Yawei * we check it without locking here to avoid unnecessary 14111ea06becSNiu Yawei * dqget()/dqput() calls. 14121ea06becSNiu Yawei */ 14131ea06becSNiu Yawei if (inode->i_dquot[cnt]) 14141ea06becSNiu Yawei continue; 14151ea06becSNiu Yawei init_needed = 1; 14161ea06becSNiu Yawei 1417884d179dSJan Kara switch (cnt) { 1418884d179dSJan Kara case USRQUOTA: 1419aca645a6SEric W. Biederman qid = make_kqid_uid(inode->i_uid); 1420884d179dSJan Kara break; 1421884d179dSJan Kara case GRPQUOTA: 1422aca645a6SEric W. Biederman qid = make_kqid_gid(inode->i_gid); 1423884d179dSJan Kara break; 1424884d179dSJan Kara } 1425aca645a6SEric W. Biederman got[cnt] = dqget(sb, qid); 1426884d179dSJan Kara } 1427884d179dSJan Kara 14281ea06becSNiu Yawei /* All required i_dquot has been initialized */ 14291ea06becSNiu Yawei if (!init_needed) 14301ea06becSNiu Yawei return; 14311ea06becSNiu Yawei 1432884d179dSJan Kara down_write(&sb_dqopt(sb)->dqptr_sem); 1433884d179dSJan Kara if (IS_NOQUOTA(inode)) 1434884d179dSJan Kara goto out_err; 1435884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1436884d179dSJan Kara if (type != -1 && cnt != type) 1437884d179dSJan Kara continue; 1438884d179dSJan Kara /* Avoid races with quotaoff() */ 1439884d179dSJan Kara if (!sb_has_quota_active(sb, cnt)) 1440884d179dSJan Kara continue; 14414408ea41SJan Kara /* We could race with quotaon or dqget() could have failed */ 14424408ea41SJan Kara if (!got[cnt]) 14434408ea41SJan Kara continue; 1444dd6f3c6dSJan Kara if (!inode->i_dquot[cnt]) { 1445884d179dSJan Kara inode->i_dquot[cnt] = got[cnt]; 1446dd6f3c6dSJan Kara got[cnt] = NULL; 14470a5a9c72SJan Kara /* 14480a5a9c72SJan Kara * Make quota reservation system happy if someone 14490a5a9c72SJan Kara * did a write before quota was turned on 14500a5a9c72SJan Kara */ 14510a5a9c72SJan Kara rsv = inode_get_rsv_space(inode); 145268ac8bfbSJeff Mahoney if (unlikely(rsv)) { 145368ac8bfbSJeff Mahoney spin_lock(&dq_data_lock); 14540a5a9c72SJan Kara dquot_resv_space(inode->i_dquot[cnt], rsv); 145568ac8bfbSJeff Mahoney spin_unlock(&dq_data_lock); 145668ac8bfbSJeff Mahoney } 1457884d179dSJan Kara } 1458884d179dSJan Kara } 1459884d179dSJan Kara out_err: 1460884d179dSJan Kara up_write(&sb_dqopt(sb)->dqptr_sem); 1461884d179dSJan Kara /* Drop unused references */ 1462dc52dd3aSDmitry Monakhov dqput_all(got); 1463871a2931SChristoph Hellwig } 1464871a2931SChristoph Hellwig 1465871a2931SChristoph Hellwig void dquot_initialize(struct inode *inode) 1466871a2931SChristoph Hellwig { 1467871a2931SChristoph Hellwig __dquot_initialize(inode, -1); 1468884d179dSJan Kara } 1469884d179dSJan Kara EXPORT_SYMBOL(dquot_initialize); 1470884d179dSJan Kara 1471884d179dSJan Kara /* 1472884d179dSJan Kara * Release all quotas referenced by inode 1473884d179dSJan Kara */ 14749f754758SChristoph Hellwig static void __dquot_drop(struct inode *inode) 1475884d179dSJan Kara { 1476884d179dSJan Kara int cnt; 1477884d179dSJan Kara struct dquot *put[MAXQUOTAS]; 1478884d179dSJan Kara 1479884d179dSJan Kara down_write(&sb_dqopt(inode->i_sb)->dqptr_sem); 1480884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1481884d179dSJan Kara put[cnt] = inode->i_dquot[cnt]; 1482dd6f3c6dSJan Kara inode->i_dquot[cnt] = NULL; 1483884d179dSJan Kara } 1484884d179dSJan Kara up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); 1485dc52dd3aSDmitry Monakhov dqput_all(put); 1486884d179dSJan Kara } 1487884d179dSJan Kara 14889f754758SChristoph Hellwig void dquot_drop(struct inode *inode) 1489884d179dSJan Kara { 1490884d179dSJan Kara int cnt; 14919f754758SChristoph Hellwig 14929f754758SChristoph Hellwig if (IS_NOQUOTA(inode)) 14939f754758SChristoph Hellwig return; 14949f754758SChristoph Hellwig 14959f754758SChristoph Hellwig /* 14969f754758SChristoph Hellwig * Test before calling to rule out calls from proc and such 1497884d179dSJan Kara * where we are not allowed to block. Note that this is 1498884d179dSJan Kara * actually reliable test even without the lock - the caller 1499884d179dSJan Kara * must assure that nobody can come after the DQUOT_DROP and 15009f754758SChristoph Hellwig * add quota pointers back anyway. 15019f754758SChristoph Hellwig */ 15029f754758SChristoph Hellwig for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1503dd6f3c6dSJan Kara if (inode->i_dquot[cnt]) 1504884d179dSJan Kara break; 15059f754758SChristoph Hellwig } 15069f754758SChristoph Hellwig 1507884d179dSJan Kara if (cnt < MAXQUOTAS) 15089f754758SChristoph Hellwig __dquot_drop(inode); 1509884d179dSJan Kara } 15109f754758SChristoph Hellwig EXPORT_SYMBOL(dquot_drop); 1511884d179dSJan Kara 1512884d179dSJan Kara /* 1513fd8fbfc1SDmitry Monakhov * inode_reserved_space is managed internally by quota, and protected by 1514fd8fbfc1SDmitry Monakhov * i_lock similar to i_blocks+i_bytes. 1515fd8fbfc1SDmitry Monakhov */ 1516fd8fbfc1SDmitry Monakhov static qsize_t *inode_reserved_space(struct inode * inode) 1517fd8fbfc1SDmitry Monakhov { 1518fd8fbfc1SDmitry Monakhov /* Filesystem must explicitly define it's own method in order to use 1519fd8fbfc1SDmitry Monakhov * quota reservation interface */ 1520fd8fbfc1SDmitry Monakhov BUG_ON(!inode->i_sb->dq_op->get_reserved_space); 1521fd8fbfc1SDmitry Monakhov return inode->i_sb->dq_op->get_reserved_space(inode); 1522fd8fbfc1SDmitry Monakhov } 1523fd8fbfc1SDmitry Monakhov 1524c469070aSDmitry Monakhov void inode_add_rsv_space(struct inode *inode, qsize_t number) 1525fd8fbfc1SDmitry Monakhov { 1526fd8fbfc1SDmitry Monakhov spin_lock(&inode->i_lock); 1527fd8fbfc1SDmitry Monakhov *inode_reserved_space(inode) += number; 1528fd8fbfc1SDmitry Monakhov spin_unlock(&inode->i_lock); 1529fd8fbfc1SDmitry Monakhov } 1530c469070aSDmitry Monakhov EXPORT_SYMBOL(inode_add_rsv_space); 1531fd8fbfc1SDmitry Monakhov 1532c469070aSDmitry Monakhov void inode_claim_rsv_space(struct inode *inode, qsize_t number) 1533fd8fbfc1SDmitry Monakhov { 1534fd8fbfc1SDmitry Monakhov spin_lock(&inode->i_lock); 1535fd8fbfc1SDmitry Monakhov *inode_reserved_space(inode) -= number; 1536fd8fbfc1SDmitry Monakhov __inode_add_bytes(inode, number); 1537fd8fbfc1SDmitry Monakhov spin_unlock(&inode->i_lock); 1538fd8fbfc1SDmitry Monakhov } 1539c469070aSDmitry Monakhov EXPORT_SYMBOL(inode_claim_rsv_space); 1540fd8fbfc1SDmitry Monakhov 15411c8924ebSJan Kara void inode_reclaim_rsv_space(struct inode *inode, qsize_t number) 15421c8924ebSJan Kara { 15431c8924ebSJan Kara spin_lock(&inode->i_lock); 15441c8924ebSJan Kara *inode_reserved_space(inode) += number; 15451c8924ebSJan Kara __inode_sub_bytes(inode, number); 15461c8924ebSJan Kara spin_unlock(&inode->i_lock); 15471c8924ebSJan Kara } 15481c8924ebSJan Kara EXPORT_SYMBOL(inode_reclaim_rsv_space); 15491c8924ebSJan Kara 1550c469070aSDmitry Monakhov void inode_sub_rsv_space(struct inode *inode, qsize_t number) 1551fd8fbfc1SDmitry Monakhov { 1552fd8fbfc1SDmitry Monakhov spin_lock(&inode->i_lock); 1553fd8fbfc1SDmitry Monakhov *inode_reserved_space(inode) -= number; 1554fd8fbfc1SDmitry Monakhov spin_unlock(&inode->i_lock); 1555fd8fbfc1SDmitry Monakhov } 1556c469070aSDmitry Monakhov EXPORT_SYMBOL(inode_sub_rsv_space); 1557fd8fbfc1SDmitry Monakhov 1558fd8fbfc1SDmitry Monakhov static qsize_t inode_get_rsv_space(struct inode *inode) 1559fd8fbfc1SDmitry Monakhov { 1560fd8fbfc1SDmitry Monakhov qsize_t ret; 156105b5d898SJan Kara 156205b5d898SJan Kara if (!inode->i_sb->dq_op->get_reserved_space) 156305b5d898SJan Kara return 0; 1564fd8fbfc1SDmitry Monakhov spin_lock(&inode->i_lock); 1565fd8fbfc1SDmitry Monakhov ret = *inode_reserved_space(inode); 1566fd8fbfc1SDmitry Monakhov spin_unlock(&inode->i_lock); 1567fd8fbfc1SDmitry Monakhov return ret; 1568fd8fbfc1SDmitry Monakhov } 1569fd8fbfc1SDmitry Monakhov 1570fd8fbfc1SDmitry Monakhov static void inode_incr_space(struct inode *inode, qsize_t number, 1571fd8fbfc1SDmitry Monakhov int reserve) 1572fd8fbfc1SDmitry Monakhov { 1573fd8fbfc1SDmitry Monakhov if (reserve) 1574fd8fbfc1SDmitry Monakhov inode_add_rsv_space(inode, number); 1575fd8fbfc1SDmitry Monakhov else 1576fd8fbfc1SDmitry Monakhov inode_add_bytes(inode, number); 1577fd8fbfc1SDmitry Monakhov } 1578fd8fbfc1SDmitry Monakhov 1579fd8fbfc1SDmitry Monakhov static void inode_decr_space(struct inode *inode, qsize_t number, int reserve) 1580fd8fbfc1SDmitry Monakhov { 1581fd8fbfc1SDmitry Monakhov if (reserve) 1582fd8fbfc1SDmitry Monakhov inode_sub_rsv_space(inode, number); 1583fd8fbfc1SDmitry Monakhov else 1584fd8fbfc1SDmitry Monakhov inode_sub_bytes(inode, number); 1585fd8fbfc1SDmitry Monakhov } 1586fd8fbfc1SDmitry Monakhov 1587fd8fbfc1SDmitry Monakhov /* 15885dd4056dSChristoph Hellwig * This functions updates i_blocks+i_bytes fields and quota information 15895dd4056dSChristoph Hellwig * (together with appropriate checks). 15905dd4056dSChristoph Hellwig * 15915dd4056dSChristoph Hellwig * NOTE: We absolutely rely on the fact that caller dirties the inode 15925dd4056dSChristoph Hellwig * (usually helpers in quotaops.h care about this) and holds a handle for 15935dd4056dSChristoph Hellwig * the current transaction so that dquot write and inode write go into the 15945dd4056dSChristoph Hellwig * same transaction. 1595884d179dSJan Kara */ 1596884d179dSJan Kara 1597884d179dSJan Kara /* 1598884d179dSJan Kara * This operation can block, but only after everything is updated 1599884d179dSJan Kara */ 160056246f9aSEric Sandeen int __dquot_alloc_space(struct inode *inode, qsize_t number, int flags) 1601884d179dSJan Kara { 16025dd4056dSChristoph Hellwig int cnt, ret = 0; 1603bf097aafSJan Kara struct dquot_warn warn[MAXQUOTAS]; 1604bf097aafSJan Kara struct dquot **dquots = inode->i_dquot; 160556246f9aSEric Sandeen int reserve = flags & DQUOT_SPACE_RESERVE; 1606884d179dSJan Kara 1607fd8fbfc1SDmitry Monakhov /* 1608fd8fbfc1SDmitry Monakhov * First test before acquiring mutex - solves deadlocks when we 1609fd8fbfc1SDmitry Monakhov * re-enter the quota code and are already holding the mutex 1610fd8fbfc1SDmitry Monakhov */ 1611189eef59SChristoph Hellwig if (!dquot_active(inode)) { 1612fd8fbfc1SDmitry Monakhov inode_incr_space(inode, number, reserve); 1613fd8fbfc1SDmitry Monakhov goto out; 1614fd8fbfc1SDmitry Monakhov } 1615fd8fbfc1SDmitry Monakhov 1616884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 1617bf097aafSJan Kara warn[cnt].w_type = QUOTA_NL_NOWARN; 1618884d179dSJan Kara 16196ea2eea1SJeff Liu down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1620884d179dSJan Kara spin_lock(&dq_data_lock); 1621884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1622bf097aafSJan Kara if (!dquots[cnt]) 1623884d179dSJan Kara continue; 1624bf097aafSJan Kara ret = check_bdq(dquots[cnt], number, 1625bf097aafSJan Kara !(flags & DQUOT_SPACE_WARN), &warn[cnt]); 1626bf097aafSJan Kara if (ret && !(flags & DQUOT_SPACE_NOFAIL)) { 1627fd8fbfc1SDmitry Monakhov spin_unlock(&dq_data_lock); 1628fd8fbfc1SDmitry Monakhov goto out_flush_warn; 1629884d179dSJan Kara } 1630884d179dSJan Kara } 1631884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1632bf097aafSJan Kara if (!dquots[cnt]) 1633884d179dSJan Kara continue; 1634884d179dSJan Kara if (reserve) 1635bf097aafSJan Kara dquot_resv_space(dquots[cnt], number); 1636884d179dSJan Kara else 1637bf097aafSJan Kara dquot_incr_space(dquots[cnt], number); 1638884d179dSJan Kara } 1639fd8fbfc1SDmitry Monakhov inode_incr_space(inode, number, reserve); 1640884d179dSJan Kara spin_unlock(&dq_data_lock); 1641fd8fbfc1SDmitry Monakhov 1642fd8fbfc1SDmitry Monakhov if (reserve) 1643fd8fbfc1SDmitry Monakhov goto out_flush_warn; 1644bf097aafSJan Kara mark_all_dquot_dirty(dquots); 1645fd8fbfc1SDmitry Monakhov out_flush_warn: 1646fd8fbfc1SDmitry Monakhov up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1647bf097aafSJan Kara flush_warnings(warn); 1648fd8fbfc1SDmitry Monakhov out: 1649884d179dSJan Kara return ret; 1650884d179dSJan Kara } 16515dd4056dSChristoph Hellwig EXPORT_SYMBOL(__dquot_alloc_space); 1652884d179dSJan Kara 1653884d179dSJan Kara /* 1654884d179dSJan Kara * This operation can block, but only after everything is updated 1655884d179dSJan Kara */ 165663936ddaSChristoph Hellwig int dquot_alloc_inode(const struct inode *inode) 1657884d179dSJan Kara { 1658efd8f0e6SChristoph Hellwig int cnt, ret = 0; 1659bf097aafSJan Kara struct dquot_warn warn[MAXQUOTAS]; 1660bf097aafSJan Kara struct dquot * const *dquots = inode->i_dquot; 1661884d179dSJan Kara 1662884d179dSJan Kara /* First test before acquiring mutex - solves deadlocks when we 1663884d179dSJan Kara * re-enter the quota code and are already holding the mutex */ 1664189eef59SChristoph Hellwig if (!dquot_active(inode)) 166563936ddaSChristoph Hellwig return 0; 1666884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 1667bf097aafSJan Kara warn[cnt].w_type = QUOTA_NL_NOWARN; 1668884d179dSJan Kara down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1669884d179dSJan Kara spin_lock(&dq_data_lock); 1670884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1671bf097aafSJan Kara if (!dquots[cnt]) 1672884d179dSJan Kara continue; 1673bf097aafSJan Kara ret = check_idq(dquots[cnt], 1, &warn[cnt]); 1674efd8f0e6SChristoph Hellwig if (ret) 1675884d179dSJan Kara goto warn_put_all; 1676884d179dSJan Kara } 1677884d179dSJan Kara 1678884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1679bf097aafSJan Kara if (!dquots[cnt]) 1680884d179dSJan Kara continue; 1681bf097aafSJan Kara dquot_incr_inodes(dquots[cnt], 1); 1682884d179dSJan Kara } 1683efd8f0e6SChristoph Hellwig 1684884d179dSJan Kara warn_put_all: 1685884d179dSJan Kara spin_unlock(&dq_data_lock); 168663936ddaSChristoph Hellwig if (ret == 0) 1687bf097aafSJan Kara mark_all_dquot_dirty(dquots); 1688884d179dSJan Kara up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1689bf097aafSJan Kara flush_warnings(warn); 1690884d179dSJan Kara return ret; 1691884d179dSJan Kara } 1692884d179dSJan Kara EXPORT_SYMBOL(dquot_alloc_inode); 1693884d179dSJan Kara 16945dd4056dSChristoph Hellwig /* 16955dd4056dSChristoph Hellwig * Convert in-memory reserved quotas to real consumed quotas 16965dd4056dSChristoph Hellwig */ 16975dd4056dSChristoph Hellwig int dquot_claim_space_nodirty(struct inode *inode, qsize_t number) 1698884d179dSJan Kara { 1699884d179dSJan Kara int cnt; 1700884d179dSJan Kara 1701189eef59SChristoph Hellwig if (!dquot_active(inode)) { 1702fd8fbfc1SDmitry Monakhov inode_claim_rsv_space(inode, number); 17035dd4056dSChristoph Hellwig return 0; 1704884d179dSJan Kara } 1705884d179dSJan Kara 1706884d179dSJan Kara down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1707884d179dSJan Kara spin_lock(&dq_data_lock); 1708884d179dSJan Kara /* Claim reserved quotas to allocated quotas */ 1709884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1710dd6f3c6dSJan Kara if (inode->i_dquot[cnt]) 1711884d179dSJan Kara dquot_claim_reserved_space(inode->i_dquot[cnt], 1712884d179dSJan Kara number); 1713884d179dSJan Kara } 1714884d179dSJan Kara /* Update inode bytes */ 1715fd8fbfc1SDmitry Monakhov inode_claim_rsv_space(inode, number); 1716884d179dSJan Kara spin_unlock(&dq_data_lock); 1717dc52dd3aSDmitry Monakhov mark_all_dquot_dirty(inode->i_dquot); 1718884d179dSJan Kara up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 17195dd4056dSChristoph Hellwig return 0; 1720884d179dSJan Kara } 17215dd4056dSChristoph Hellwig EXPORT_SYMBOL(dquot_claim_space_nodirty); 1722884d179dSJan Kara 1723884d179dSJan Kara /* 17241c8924ebSJan Kara * Convert allocated space back to in-memory reserved quotas 17251c8924ebSJan Kara */ 17261c8924ebSJan Kara void dquot_reclaim_space_nodirty(struct inode *inode, qsize_t number) 17271c8924ebSJan Kara { 17281c8924ebSJan Kara int cnt; 17291c8924ebSJan Kara 17301c8924ebSJan Kara if (!dquot_active(inode)) { 17311c8924ebSJan Kara inode_reclaim_rsv_space(inode, number); 17321c8924ebSJan Kara return; 17331c8924ebSJan Kara } 17341c8924ebSJan Kara 17351c8924ebSJan Kara down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 17361c8924ebSJan Kara spin_lock(&dq_data_lock); 17371c8924ebSJan Kara /* Claim reserved quotas to allocated quotas */ 17381c8924ebSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 17391c8924ebSJan Kara if (inode->i_dquot[cnt]) 17401c8924ebSJan Kara dquot_reclaim_reserved_space(inode->i_dquot[cnt], 17411c8924ebSJan Kara number); 17421c8924ebSJan Kara } 17431c8924ebSJan Kara /* Update inode bytes */ 17441c8924ebSJan Kara inode_reclaim_rsv_space(inode, number); 17451c8924ebSJan Kara spin_unlock(&dq_data_lock); 17461c8924ebSJan Kara mark_all_dquot_dirty(inode->i_dquot); 17471c8924ebSJan Kara up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 17481c8924ebSJan Kara return; 17491c8924ebSJan Kara } 17501c8924ebSJan Kara EXPORT_SYMBOL(dquot_reclaim_space_nodirty); 17511c8924ebSJan Kara 17521c8924ebSJan Kara /* 1753884d179dSJan Kara * This operation can block, but only after everything is updated 1754884d179dSJan Kara */ 175556246f9aSEric Sandeen void __dquot_free_space(struct inode *inode, qsize_t number, int flags) 1756884d179dSJan Kara { 1757884d179dSJan Kara unsigned int cnt; 1758bf097aafSJan Kara struct dquot_warn warn[MAXQUOTAS]; 1759bf097aafSJan Kara struct dquot **dquots = inode->i_dquot; 176056246f9aSEric Sandeen int reserve = flags & DQUOT_SPACE_RESERVE; 1761884d179dSJan Kara 1762884d179dSJan Kara /* First test before acquiring mutex - solves deadlocks when we 1763884d179dSJan Kara * re-enter the quota code and are already holding the mutex */ 1764189eef59SChristoph Hellwig if (!dquot_active(inode)) { 1765fd8fbfc1SDmitry Monakhov inode_decr_space(inode, number, reserve); 17665dd4056dSChristoph Hellwig return; 1767884d179dSJan Kara } 1768884d179dSJan Kara 1769884d179dSJan Kara down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1770884d179dSJan Kara spin_lock(&dq_data_lock); 1771884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1772bf097aafSJan Kara int wtype; 1773bf097aafSJan Kara 1774bf097aafSJan Kara warn[cnt].w_type = QUOTA_NL_NOWARN; 1775bf097aafSJan Kara if (!dquots[cnt]) 1776884d179dSJan Kara continue; 1777bf097aafSJan Kara wtype = info_bdq_free(dquots[cnt], number); 1778bf097aafSJan Kara if (wtype != QUOTA_NL_NOWARN) 1779bf097aafSJan Kara prepare_warning(&warn[cnt], dquots[cnt], wtype); 1780fd8fbfc1SDmitry Monakhov if (reserve) 1781bf097aafSJan Kara dquot_free_reserved_space(dquots[cnt], number); 1782fd8fbfc1SDmitry Monakhov else 1783bf097aafSJan Kara dquot_decr_space(dquots[cnt], number); 1784884d179dSJan Kara } 1785fd8fbfc1SDmitry Monakhov inode_decr_space(inode, number, reserve); 1786884d179dSJan Kara spin_unlock(&dq_data_lock); 1787fd8fbfc1SDmitry Monakhov 1788fd8fbfc1SDmitry Monakhov if (reserve) 1789fd8fbfc1SDmitry Monakhov goto out_unlock; 1790bf097aafSJan Kara mark_all_dquot_dirty(dquots); 1791fd8fbfc1SDmitry Monakhov out_unlock: 1792884d179dSJan Kara up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1793bf097aafSJan Kara flush_warnings(warn); 1794884d179dSJan Kara } 17955dd4056dSChristoph Hellwig EXPORT_SYMBOL(__dquot_free_space); 1796fd8fbfc1SDmitry Monakhov 1797fd8fbfc1SDmitry Monakhov /* 1798884d179dSJan Kara * This operation can block, but only after everything is updated 1799884d179dSJan Kara */ 180063936ddaSChristoph Hellwig void dquot_free_inode(const struct inode *inode) 1801884d179dSJan Kara { 1802884d179dSJan Kara unsigned int cnt; 1803bf097aafSJan Kara struct dquot_warn warn[MAXQUOTAS]; 1804bf097aafSJan Kara struct dquot * const *dquots = inode->i_dquot; 1805884d179dSJan Kara 1806884d179dSJan Kara /* First test before acquiring mutex - solves deadlocks when we 1807884d179dSJan Kara * re-enter the quota code and are already holding the mutex */ 1808189eef59SChristoph Hellwig if (!dquot_active(inode)) 180963936ddaSChristoph Hellwig return; 1810884d179dSJan Kara 1811884d179dSJan Kara down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1812884d179dSJan Kara spin_lock(&dq_data_lock); 1813884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1814bf097aafSJan Kara int wtype; 1815bf097aafSJan Kara 1816bf097aafSJan Kara warn[cnt].w_type = QUOTA_NL_NOWARN; 1817bf097aafSJan Kara if (!dquots[cnt]) 1818884d179dSJan Kara continue; 1819bf097aafSJan Kara wtype = info_idq_free(dquots[cnt], 1); 1820bf097aafSJan Kara if (wtype != QUOTA_NL_NOWARN) 1821bf097aafSJan Kara prepare_warning(&warn[cnt], dquots[cnt], wtype); 1822bf097aafSJan Kara dquot_decr_inodes(dquots[cnt], 1); 1823884d179dSJan Kara } 1824884d179dSJan Kara spin_unlock(&dq_data_lock); 1825bf097aafSJan Kara mark_all_dquot_dirty(dquots); 1826884d179dSJan Kara up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1827bf097aafSJan Kara flush_warnings(warn); 1828884d179dSJan Kara } 1829884d179dSJan Kara EXPORT_SYMBOL(dquot_free_inode); 1830884d179dSJan Kara 1831884d179dSJan Kara /* 1832884d179dSJan Kara * Transfer the number of inode and blocks from one diskquota to an other. 1833bc8e5f07SJan Kara * On success, dquot references in transfer_to are consumed and references 1834bc8e5f07SJan Kara * to original dquots that need to be released are placed there. On failure, 1835bc8e5f07SJan Kara * references are kept untouched. 1836884d179dSJan Kara * 1837884d179dSJan Kara * This operation can block, but only after everything is updated 1838884d179dSJan Kara * A transaction must be started when entering this function. 1839bc8e5f07SJan Kara * 1840884d179dSJan Kara */ 1841bc8e5f07SJan Kara int __dquot_transfer(struct inode *inode, struct dquot **transfer_to) 1842884d179dSJan Kara { 1843884d179dSJan Kara qsize_t space, cur_space; 1844884d179dSJan Kara qsize_t rsv_space = 0; 1845bc8e5f07SJan Kara struct dquot *transfer_from[MAXQUOTAS] = {}; 1846efd8f0e6SChristoph Hellwig int cnt, ret = 0; 18479e32784bSDmitry char is_valid[MAXQUOTAS] = {}; 1848bf097aafSJan Kara struct dquot_warn warn_to[MAXQUOTAS]; 1849bf097aafSJan Kara struct dquot_warn warn_from_inodes[MAXQUOTAS]; 1850bf097aafSJan Kara struct dquot_warn warn_from_space[MAXQUOTAS]; 1851884d179dSJan Kara 1852884d179dSJan Kara /* First test before acquiring mutex - solves deadlocks when we 1853884d179dSJan Kara * re-enter the quota code and are already holding the mutex */ 1854884d179dSJan Kara if (IS_NOQUOTA(inode)) 1855efd8f0e6SChristoph Hellwig return 0; 1856884d179dSJan Kara /* Initialize the arrays */ 1857bf097aafSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1858bf097aafSJan Kara warn_to[cnt].w_type = QUOTA_NL_NOWARN; 1859bf097aafSJan Kara warn_from_inodes[cnt].w_type = QUOTA_NL_NOWARN; 1860bf097aafSJan Kara warn_from_space[cnt].w_type = QUOTA_NL_NOWARN; 1861bf097aafSJan Kara } 1862884d179dSJan Kara down_write(&sb_dqopt(inode->i_sb)->dqptr_sem); 1863884d179dSJan Kara if (IS_NOQUOTA(inode)) { /* File without quota accounting? */ 1864884d179dSJan Kara up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); 1865bc8e5f07SJan Kara return 0; 1866884d179dSJan Kara } 1867884d179dSJan Kara spin_lock(&dq_data_lock); 1868884d179dSJan Kara cur_space = inode_get_bytes(inode); 1869fd8fbfc1SDmitry Monakhov rsv_space = inode_get_rsv_space(inode); 1870884d179dSJan Kara space = cur_space + rsv_space; 1871884d179dSJan Kara /* Build the transfer_from list and check the limits */ 1872884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 18739e32784bSDmitry /* 18749e32784bSDmitry * Skip changes for same uid or gid or for turned off quota-type. 18759e32784bSDmitry */ 1876dd6f3c6dSJan Kara if (!transfer_to[cnt]) 1877884d179dSJan Kara continue; 18789e32784bSDmitry /* Avoid races with quotaoff() */ 18799e32784bSDmitry if (!sb_has_quota_active(inode->i_sb, cnt)) 18809e32784bSDmitry continue; 18819e32784bSDmitry is_valid[cnt] = 1; 1882884d179dSJan Kara transfer_from[cnt] = inode->i_dquot[cnt]; 1883bf097aafSJan Kara ret = check_idq(transfer_to[cnt], 1, &warn_to[cnt]); 1884efd8f0e6SChristoph Hellwig if (ret) 1885efd8f0e6SChristoph Hellwig goto over_quota; 1886bf097aafSJan Kara ret = check_bdq(transfer_to[cnt], space, 0, &warn_to[cnt]); 1887efd8f0e6SChristoph Hellwig if (ret) 1888884d179dSJan Kara goto over_quota; 1889884d179dSJan Kara } 1890884d179dSJan Kara 1891884d179dSJan Kara /* 1892884d179dSJan Kara * Finally perform the needed transfer from transfer_from to transfer_to 1893884d179dSJan Kara */ 1894884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 18959e32784bSDmitry if (!is_valid[cnt]) 1896884d179dSJan Kara continue; 1897884d179dSJan Kara /* Due to IO error we might not have transfer_from[] structure */ 1898884d179dSJan Kara if (transfer_from[cnt]) { 1899bf097aafSJan Kara int wtype; 1900bf097aafSJan Kara wtype = info_idq_free(transfer_from[cnt], 1); 1901bf097aafSJan Kara if (wtype != QUOTA_NL_NOWARN) 1902bf097aafSJan Kara prepare_warning(&warn_from_inodes[cnt], 1903bf097aafSJan Kara transfer_from[cnt], wtype); 1904bf097aafSJan Kara wtype = info_bdq_free(transfer_from[cnt], space); 1905bf097aafSJan Kara if (wtype != QUOTA_NL_NOWARN) 1906bf097aafSJan Kara prepare_warning(&warn_from_space[cnt], 1907bf097aafSJan Kara transfer_from[cnt], wtype); 1908884d179dSJan Kara dquot_decr_inodes(transfer_from[cnt], 1); 1909884d179dSJan Kara dquot_decr_space(transfer_from[cnt], cur_space); 1910884d179dSJan Kara dquot_free_reserved_space(transfer_from[cnt], 1911884d179dSJan Kara rsv_space); 1912884d179dSJan Kara } 1913884d179dSJan Kara 1914884d179dSJan Kara dquot_incr_inodes(transfer_to[cnt], 1); 1915884d179dSJan Kara dquot_incr_space(transfer_to[cnt], cur_space); 1916884d179dSJan Kara dquot_resv_space(transfer_to[cnt], rsv_space); 1917884d179dSJan Kara 1918884d179dSJan Kara inode->i_dquot[cnt] = transfer_to[cnt]; 1919884d179dSJan Kara } 1920884d179dSJan Kara spin_unlock(&dq_data_lock); 1921884d179dSJan Kara up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); 1922884d179dSJan Kara 1923dc52dd3aSDmitry Monakhov mark_all_dquot_dirty(transfer_from); 1924dc52dd3aSDmitry Monakhov mark_all_dquot_dirty(transfer_to); 1925bf097aafSJan Kara flush_warnings(warn_to); 1926bf097aafSJan Kara flush_warnings(warn_from_inodes); 1927bf097aafSJan Kara flush_warnings(warn_from_space); 1928bc8e5f07SJan Kara /* Pass back references to put */ 1929dc52dd3aSDmitry Monakhov for (cnt = 0; cnt < MAXQUOTAS; cnt++) 19309e32784bSDmitry if (is_valid[cnt]) 1931bc8e5f07SJan Kara transfer_to[cnt] = transfer_from[cnt]; 193286f3cbecSJan Kara return 0; 1933884d179dSJan Kara over_quota: 1934884d179dSJan Kara spin_unlock(&dq_data_lock); 1935884d179dSJan Kara up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); 1936bf097aafSJan Kara flush_warnings(warn_to); 193786f3cbecSJan Kara return ret; 1938884d179dSJan Kara } 1939bc8e5f07SJan Kara EXPORT_SYMBOL(__dquot_transfer); 1940884d179dSJan Kara 19418ddd69d6SDmitry Monakhov /* Wrapper for transferring ownership of an inode for uid/gid only 19428ddd69d6SDmitry Monakhov * Called from FSXXX_setattr() 19438ddd69d6SDmitry Monakhov */ 1944b43fa828SChristoph Hellwig int dquot_transfer(struct inode *inode, struct iattr *iattr) 1945884d179dSJan Kara { 1946bc8e5f07SJan Kara struct dquot *transfer_to[MAXQUOTAS] = {}; 1947bc8e5f07SJan Kara struct super_block *sb = inode->i_sb; 1948bc8e5f07SJan Kara int ret; 19498ddd69d6SDmitry Monakhov 1950189eef59SChristoph Hellwig if (!dquot_active(inode)) 1951884d179dSJan Kara return 0; 1952bc8e5f07SJan Kara 19531a06d420SEric W. Biederman if (iattr->ia_valid & ATTR_UID && !uid_eq(iattr->ia_uid, inode->i_uid)) 1954aca645a6SEric W. Biederman transfer_to[USRQUOTA] = dqget(sb, make_kqid_uid(iattr->ia_uid)); 19551a06d420SEric W. Biederman if (iattr->ia_valid & ATTR_GID && !gid_eq(iattr->ia_gid, inode->i_gid)) 1956aca645a6SEric W. Biederman transfer_to[GRPQUOTA] = dqget(sb, make_kqid_gid(iattr->ia_gid)); 1957bc8e5f07SJan Kara 1958bc8e5f07SJan Kara ret = __dquot_transfer(inode, transfer_to); 1959bc8e5f07SJan Kara dqput_all(transfer_to); 1960bc8e5f07SJan Kara return ret; 1961884d179dSJan Kara } 1962b43fa828SChristoph Hellwig EXPORT_SYMBOL(dquot_transfer); 1963884d179dSJan Kara 1964884d179dSJan Kara /* 1965884d179dSJan Kara * Write info of quota file to disk 1966884d179dSJan Kara */ 1967884d179dSJan Kara int dquot_commit_info(struct super_block *sb, int type) 1968884d179dSJan Kara { 1969884d179dSJan Kara int ret; 1970884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 1971884d179dSJan Kara 1972884d179dSJan Kara mutex_lock(&dqopt->dqio_mutex); 1973884d179dSJan Kara ret = dqopt->ops[type]->write_file_info(sb, type); 1974884d179dSJan Kara mutex_unlock(&dqopt->dqio_mutex); 1975884d179dSJan Kara return ret; 1976884d179dSJan Kara } 1977884d179dSJan Kara EXPORT_SYMBOL(dquot_commit_info); 1978884d179dSJan Kara 1979884d179dSJan Kara /* 1980884d179dSJan Kara * Definitions of diskquota operations. 1981884d179dSJan Kara */ 198261e225dcSAlexey Dobriyan const struct dquot_operations dquot_operations = { 1983884d179dSJan Kara .write_dquot = dquot_commit, 1984884d179dSJan Kara .acquire_dquot = dquot_acquire, 1985884d179dSJan Kara .release_dquot = dquot_release, 1986884d179dSJan Kara .mark_dirty = dquot_mark_dquot_dirty, 1987884d179dSJan Kara .write_info = dquot_commit_info, 1988884d179dSJan Kara .alloc_dquot = dquot_alloc, 1989884d179dSJan Kara .destroy_dquot = dquot_destroy, 1990884d179dSJan Kara }; 1991123e9cafSChristoph Hellwig EXPORT_SYMBOL(dquot_operations); 1992884d179dSJan Kara 1993884d179dSJan Kara /* 1994907f4554SChristoph Hellwig * Generic helper for ->open on filesystems supporting disk quotas. 1995907f4554SChristoph Hellwig */ 1996907f4554SChristoph Hellwig int dquot_file_open(struct inode *inode, struct file *file) 1997907f4554SChristoph Hellwig { 1998907f4554SChristoph Hellwig int error; 1999907f4554SChristoph Hellwig 2000907f4554SChristoph Hellwig error = generic_file_open(inode, file); 2001907f4554SChristoph Hellwig if (!error && (file->f_mode & FMODE_WRITE)) 2002871a2931SChristoph Hellwig dquot_initialize(inode); 2003907f4554SChristoph Hellwig return error; 2004907f4554SChristoph Hellwig } 2005907f4554SChristoph Hellwig EXPORT_SYMBOL(dquot_file_open); 2006907f4554SChristoph Hellwig 2007907f4554SChristoph Hellwig /* 2008884d179dSJan Kara * Turn quota off on a device. type == -1 ==> quotaoff for all types (umount) 2009884d179dSJan Kara */ 20100f0dd62fSChristoph Hellwig int dquot_disable(struct super_block *sb, int type, unsigned int flags) 2011884d179dSJan Kara { 2012884d179dSJan Kara int cnt, ret = 0; 2013884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 2014884d179dSJan Kara struct inode *toputinode[MAXQUOTAS]; 2015884d179dSJan Kara 2016884d179dSJan Kara /* Cannot turn off usage accounting without turning off limits, or 2017884d179dSJan Kara * suspend quotas and simultaneously turn quotas off. */ 2018884d179dSJan Kara if ((flags & DQUOT_USAGE_ENABLED && !(flags & DQUOT_LIMITS_ENABLED)) 2019884d179dSJan Kara || (flags & DQUOT_SUSPENDED && flags & (DQUOT_LIMITS_ENABLED | 2020884d179dSJan Kara DQUOT_USAGE_ENABLED))) 2021884d179dSJan Kara return -EINVAL; 2022884d179dSJan Kara 2023884d179dSJan Kara /* We need to serialize quota_off() for device */ 2024884d179dSJan Kara mutex_lock(&dqopt->dqonoff_mutex); 2025884d179dSJan Kara 2026884d179dSJan Kara /* 2027884d179dSJan Kara * Skip everything if there's nothing to do. We have to do this because 2028884d179dSJan Kara * sometimes we are called when fill_super() failed and calling 2029884d179dSJan Kara * sync_fs() in such cases does no good. 2030884d179dSJan Kara */ 2031884d179dSJan Kara if (!sb_any_quota_loaded(sb)) { 2032884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 2033884d179dSJan Kara return 0; 2034884d179dSJan Kara } 2035884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 2036884d179dSJan Kara toputinode[cnt] = NULL; 2037884d179dSJan Kara if (type != -1 && cnt != type) 2038884d179dSJan Kara continue; 2039884d179dSJan Kara if (!sb_has_quota_loaded(sb, cnt)) 2040884d179dSJan Kara continue; 2041884d179dSJan Kara 2042884d179dSJan Kara if (flags & DQUOT_SUSPENDED) { 2043884d179dSJan Kara spin_lock(&dq_state_lock); 2044884d179dSJan Kara dqopt->flags |= 2045884d179dSJan Kara dquot_state_flag(DQUOT_SUSPENDED, cnt); 2046884d179dSJan Kara spin_unlock(&dq_state_lock); 2047884d179dSJan Kara } else { 2048884d179dSJan Kara spin_lock(&dq_state_lock); 2049884d179dSJan Kara dqopt->flags &= ~dquot_state_flag(flags, cnt); 2050884d179dSJan Kara /* Turning off suspended quotas? */ 2051884d179dSJan Kara if (!sb_has_quota_loaded(sb, cnt) && 2052884d179dSJan Kara sb_has_quota_suspended(sb, cnt)) { 2053884d179dSJan Kara dqopt->flags &= ~dquot_state_flag( 2054884d179dSJan Kara DQUOT_SUSPENDED, cnt); 2055884d179dSJan Kara spin_unlock(&dq_state_lock); 2056884d179dSJan Kara iput(dqopt->files[cnt]); 2057884d179dSJan Kara dqopt->files[cnt] = NULL; 2058884d179dSJan Kara continue; 2059884d179dSJan Kara } 2060884d179dSJan Kara spin_unlock(&dq_state_lock); 2061884d179dSJan Kara } 2062884d179dSJan Kara 2063884d179dSJan Kara /* We still have to keep quota loaded? */ 2064884d179dSJan Kara if (sb_has_quota_loaded(sb, cnt) && !(flags & DQUOT_SUSPENDED)) 2065884d179dSJan Kara continue; 2066884d179dSJan Kara 2067884d179dSJan Kara /* Note: these are blocking operations */ 2068884d179dSJan Kara drop_dquot_ref(sb, cnt); 2069884d179dSJan Kara invalidate_dquots(sb, cnt); 2070884d179dSJan Kara /* 2071268157baSJan Kara * Now all dquots should be invalidated, all writes done so we 2072268157baSJan Kara * should be only users of the info. No locks needed. 2073884d179dSJan Kara */ 2074884d179dSJan Kara if (info_dirty(&dqopt->info[cnt])) 2075884d179dSJan Kara sb->dq_op->write_info(sb, cnt); 2076884d179dSJan Kara if (dqopt->ops[cnt]->free_file_info) 2077884d179dSJan Kara dqopt->ops[cnt]->free_file_info(sb, cnt); 2078884d179dSJan Kara put_quota_format(dqopt->info[cnt].dqi_format); 2079884d179dSJan Kara 2080884d179dSJan Kara toputinode[cnt] = dqopt->files[cnt]; 2081884d179dSJan Kara if (!sb_has_quota_loaded(sb, cnt)) 2082884d179dSJan Kara dqopt->files[cnt] = NULL; 2083884d179dSJan Kara dqopt->info[cnt].dqi_flags = 0; 2084884d179dSJan Kara dqopt->info[cnt].dqi_igrace = 0; 2085884d179dSJan Kara dqopt->info[cnt].dqi_bgrace = 0; 2086884d179dSJan Kara dqopt->ops[cnt] = NULL; 2087884d179dSJan Kara } 2088884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 2089884d179dSJan Kara 2090884d179dSJan Kara /* Skip syncing and setting flags if quota files are hidden */ 2091884d179dSJan Kara if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) 2092884d179dSJan Kara goto put_inodes; 2093884d179dSJan Kara 2094884d179dSJan Kara /* Sync the superblock so that buffers with quota data are written to 2095884d179dSJan Kara * disk (and so userspace sees correct data afterwards). */ 2096884d179dSJan Kara if (sb->s_op->sync_fs) 2097884d179dSJan Kara sb->s_op->sync_fs(sb, 1); 2098884d179dSJan Kara sync_blockdev(sb->s_bdev); 2099884d179dSJan Kara /* Now the quota files are just ordinary files and we can set the 2100884d179dSJan Kara * inode flags back. Moreover we discard the pagecache so that 2101884d179dSJan Kara * userspace sees the writes we did bypassing the pagecache. We 2102884d179dSJan Kara * must also discard the blockdev buffers so that we see the 2103884d179dSJan Kara * changes done by userspace on the next quotaon() */ 2104884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 2105884d179dSJan Kara if (toputinode[cnt]) { 2106884d179dSJan Kara mutex_lock(&dqopt->dqonoff_mutex); 2107884d179dSJan Kara /* If quota was reenabled in the meantime, we have 2108884d179dSJan Kara * nothing to do */ 2109884d179dSJan Kara if (!sb_has_quota_loaded(sb, cnt)) { 2110a80b12c3SJan Kara mutex_lock(&toputinode[cnt]->i_mutex); 2111884d179dSJan Kara toputinode[cnt]->i_flags &= ~(S_IMMUTABLE | 2112884d179dSJan Kara S_NOATIME | S_NOQUOTA); 2113268157baSJan Kara truncate_inode_pages(&toputinode[cnt]->i_data, 2114268157baSJan Kara 0); 2115884d179dSJan Kara mutex_unlock(&toputinode[cnt]->i_mutex); 211643d2932dSJan Kara mark_inode_dirty_sync(toputinode[cnt]); 2117884d179dSJan Kara } 2118884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 2119884d179dSJan Kara } 2120884d179dSJan Kara if (sb->s_bdev) 2121884d179dSJan Kara invalidate_bdev(sb->s_bdev); 2122884d179dSJan Kara put_inodes: 2123884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 2124884d179dSJan Kara if (toputinode[cnt]) { 2125884d179dSJan Kara /* On remount RO, we keep the inode pointer so that we 2126884d179dSJan Kara * can reenable quota on the subsequent remount RW. We 2127884d179dSJan Kara * have to check 'flags' variable and not use sb_has_ 2128884d179dSJan Kara * function because another quotaon / quotaoff could 2129884d179dSJan Kara * change global state before we got here. We refuse 2130884d179dSJan Kara * to suspend quotas when there is pending delete on 2131884d179dSJan Kara * the quota file... */ 2132884d179dSJan Kara if (!(flags & DQUOT_SUSPENDED)) 2133884d179dSJan Kara iput(toputinode[cnt]); 2134884d179dSJan Kara else if (!toputinode[cnt]->i_nlink) 2135884d179dSJan Kara ret = -EBUSY; 2136884d179dSJan Kara } 2137884d179dSJan Kara return ret; 2138884d179dSJan Kara } 21390f0dd62fSChristoph Hellwig EXPORT_SYMBOL(dquot_disable); 2140884d179dSJan Kara 2141287a8095SChristoph Hellwig int dquot_quota_off(struct super_block *sb, int type) 2142884d179dSJan Kara { 21430f0dd62fSChristoph Hellwig return dquot_disable(sb, type, 21440f0dd62fSChristoph Hellwig DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); 2145884d179dSJan Kara } 2146287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_quota_off); 21470f0dd62fSChristoph Hellwig 2148884d179dSJan Kara /* 2149884d179dSJan Kara * Turn quotas on on a device 2150884d179dSJan Kara */ 2151884d179dSJan Kara 2152884d179dSJan Kara /* 2153884d179dSJan Kara * Helper function to turn quotas on when we already have the inode of 2154884d179dSJan Kara * quota file and no quota information is loaded. 2155884d179dSJan Kara */ 2156884d179dSJan Kara static int vfs_load_quota_inode(struct inode *inode, int type, int format_id, 2157884d179dSJan Kara unsigned int flags) 2158884d179dSJan Kara { 2159884d179dSJan Kara struct quota_format_type *fmt = find_quota_format(format_id); 2160884d179dSJan Kara struct super_block *sb = inode->i_sb; 2161884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 2162884d179dSJan Kara int error; 2163884d179dSJan Kara int oldflags = -1; 2164884d179dSJan Kara 2165884d179dSJan Kara if (!fmt) 2166884d179dSJan Kara return -ESRCH; 2167884d179dSJan Kara if (!S_ISREG(inode->i_mode)) { 2168884d179dSJan Kara error = -EACCES; 2169884d179dSJan Kara goto out_fmt; 2170884d179dSJan Kara } 2171884d179dSJan Kara if (IS_RDONLY(inode)) { 2172884d179dSJan Kara error = -EROFS; 2173884d179dSJan Kara goto out_fmt; 2174884d179dSJan Kara } 2175884d179dSJan Kara if (!sb->s_op->quota_write || !sb->s_op->quota_read) { 2176884d179dSJan Kara error = -EINVAL; 2177884d179dSJan Kara goto out_fmt; 2178884d179dSJan Kara } 2179884d179dSJan Kara /* Usage always has to be set... */ 2180884d179dSJan Kara if (!(flags & DQUOT_USAGE_ENABLED)) { 2181884d179dSJan Kara error = -EINVAL; 2182884d179dSJan Kara goto out_fmt; 2183884d179dSJan Kara } 2184884d179dSJan Kara 2185884d179dSJan Kara if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) { 2186ab94c39bSJan Kara /* As we bypass the pagecache we must now flush all the 2187ab94c39bSJan Kara * dirty data and invalidate caches so that kernel sees 2188ab94c39bSJan Kara * changes from userspace. It is not enough to just flush 2189ab94c39bSJan Kara * the quota file since if blocksize < pagesize, invalidation 2190ab94c39bSJan Kara * of the cache could fail because of other unrelated dirty 2191ab94c39bSJan Kara * data */ 2192ab94c39bSJan Kara sync_filesystem(sb); 2193884d179dSJan Kara invalidate_bdev(sb->s_bdev); 2194884d179dSJan Kara } 2195884d179dSJan Kara mutex_lock(&dqopt->dqonoff_mutex); 2196884d179dSJan Kara if (sb_has_quota_loaded(sb, type)) { 2197884d179dSJan Kara error = -EBUSY; 2198884d179dSJan Kara goto out_lock; 2199884d179dSJan Kara } 2200884d179dSJan Kara 2201884d179dSJan Kara if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) { 2202884d179dSJan Kara /* We don't want quota and atime on quota files (deadlocks 2203884d179dSJan Kara * possible) Also nobody should write to the file - we use 2204884d179dSJan Kara * special IO operations which ignore the immutable bit. */ 2205a80b12c3SJan Kara mutex_lock(&inode->i_mutex); 2206268157baSJan Kara oldflags = inode->i_flags & (S_NOATIME | S_IMMUTABLE | 2207268157baSJan Kara S_NOQUOTA); 2208884d179dSJan Kara inode->i_flags |= S_NOQUOTA | S_NOATIME | S_IMMUTABLE; 2209dee86565SJan Kara mutex_unlock(&inode->i_mutex); 221026245c94SJan Kara /* 221126245c94SJan Kara * When S_NOQUOTA is set, remove dquot references as no more 221226245c94SJan Kara * references can be added 221326245c94SJan Kara */ 22149f754758SChristoph Hellwig __dquot_drop(inode); 2215884d179dSJan Kara } 2216884d179dSJan Kara 2217884d179dSJan Kara error = -EIO; 2218884d179dSJan Kara dqopt->files[type] = igrab(inode); 2219884d179dSJan Kara if (!dqopt->files[type]) 2220884d179dSJan Kara goto out_lock; 2221884d179dSJan Kara error = -EINVAL; 2222884d179dSJan Kara if (!fmt->qf_ops->check_quota_file(sb, type)) 2223884d179dSJan Kara goto out_file_init; 2224884d179dSJan Kara 2225884d179dSJan Kara dqopt->ops[type] = fmt->qf_ops; 2226884d179dSJan Kara dqopt->info[type].dqi_format = fmt; 2227884d179dSJan Kara dqopt->info[type].dqi_fmt_id = format_id; 2228884d179dSJan Kara INIT_LIST_HEAD(&dqopt->info[type].dqi_dirty_list); 2229884d179dSJan Kara mutex_lock(&dqopt->dqio_mutex); 2230268157baSJan Kara error = dqopt->ops[type]->read_file_info(sb, type); 2231268157baSJan Kara if (error < 0) { 2232884d179dSJan Kara mutex_unlock(&dqopt->dqio_mutex); 2233884d179dSJan Kara goto out_file_init; 2234884d179dSJan Kara } 223546fe44ceSJan Kara if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) 223646fe44ceSJan Kara dqopt->info[type].dqi_flags |= DQF_SYS_FILE; 2237884d179dSJan Kara mutex_unlock(&dqopt->dqio_mutex); 2238884d179dSJan Kara spin_lock(&dq_state_lock); 2239884d179dSJan Kara dqopt->flags |= dquot_state_flag(flags, type); 2240884d179dSJan Kara spin_unlock(&dq_state_lock); 2241884d179dSJan Kara 2242884d179dSJan Kara add_dquot_ref(sb, type); 2243884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 2244884d179dSJan Kara 2245884d179dSJan Kara return 0; 2246884d179dSJan Kara 2247884d179dSJan Kara out_file_init: 2248884d179dSJan Kara dqopt->files[type] = NULL; 2249884d179dSJan Kara iput(inode); 2250884d179dSJan Kara out_lock: 2251884d179dSJan Kara if (oldflags != -1) { 2252a80b12c3SJan Kara mutex_lock(&inode->i_mutex); 2253884d179dSJan Kara /* Set the flags back (in the case of accidental quotaon() 2254884d179dSJan Kara * on a wrong file we don't want to mess up the flags) */ 2255884d179dSJan Kara inode->i_flags &= ~(S_NOATIME | S_NOQUOTA | S_IMMUTABLE); 2256884d179dSJan Kara inode->i_flags |= oldflags; 2257dee86565SJan Kara mutex_unlock(&inode->i_mutex); 2258884d179dSJan Kara } 2259d01730d7SJiaying Zhang mutex_unlock(&dqopt->dqonoff_mutex); 2260884d179dSJan Kara out_fmt: 2261884d179dSJan Kara put_quota_format(fmt); 2262884d179dSJan Kara 2263884d179dSJan Kara return error; 2264884d179dSJan Kara } 2265884d179dSJan Kara 2266884d179dSJan Kara /* Reenable quotas on remount RW */ 22670f0dd62fSChristoph Hellwig int dquot_resume(struct super_block *sb, int type) 2268884d179dSJan Kara { 2269884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 2270884d179dSJan Kara struct inode *inode; 22710f0dd62fSChristoph Hellwig int ret = 0, cnt; 2272884d179dSJan Kara unsigned int flags; 2273884d179dSJan Kara 22740f0dd62fSChristoph Hellwig for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 22750f0dd62fSChristoph Hellwig if (type != -1 && cnt != type) 22760f0dd62fSChristoph Hellwig continue; 22770f0dd62fSChristoph Hellwig 2278884d179dSJan Kara mutex_lock(&dqopt->dqonoff_mutex); 22790f0dd62fSChristoph Hellwig if (!sb_has_quota_suspended(sb, cnt)) { 2280884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 22810f0dd62fSChristoph Hellwig continue; 2282884d179dSJan Kara } 22830f0dd62fSChristoph Hellwig inode = dqopt->files[cnt]; 22840f0dd62fSChristoph Hellwig dqopt->files[cnt] = NULL; 2285884d179dSJan Kara spin_lock(&dq_state_lock); 2286884d179dSJan Kara flags = dqopt->flags & dquot_state_flag(DQUOT_USAGE_ENABLED | 22870f0dd62fSChristoph Hellwig DQUOT_LIMITS_ENABLED, 22880f0dd62fSChristoph Hellwig cnt); 22890f0dd62fSChristoph Hellwig dqopt->flags &= ~dquot_state_flag(DQUOT_STATE_FLAGS, cnt); 2290884d179dSJan Kara spin_unlock(&dq_state_lock); 2291884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 2292884d179dSJan Kara 22930f0dd62fSChristoph Hellwig flags = dquot_generic_flag(flags, cnt); 22940f0dd62fSChristoph Hellwig ret = vfs_load_quota_inode(inode, cnt, 22950f0dd62fSChristoph Hellwig dqopt->info[cnt].dqi_fmt_id, flags); 2296884d179dSJan Kara iput(inode); 22970f0dd62fSChristoph Hellwig } 2298884d179dSJan Kara 2299884d179dSJan Kara return ret; 2300884d179dSJan Kara } 23010f0dd62fSChristoph Hellwig EXPORT_SYMBOL(dquot_resume); 2302884d179dSJan Kara 2303f00c9e44SJan Kara int dquot_quota_on(struct super_block *sb, int type, int format_id, 2304884d179dSJan Kara struct path *path) 2305884d179dSJan Kara { 2306884d179dSJan Kara int error = security_quota_on(path->dentry); 2307884d179dSJan Kara if (error) 2308884d179dSJan Kara return error; 2309884d179dSJan Kara /* Quota file not on the same filesystem? */ 2310d8c9584eSAl Viro if (path->dentry->d_sb != sb) 2311884d179dSJan Kara error = -EXDEV; 2312884d179dSJan Kara else 2313884d179dSJan Kara error = vfs_load_quota_inode(path->dentry->d_inode, type, 2314884d179dSJan Kara format_id, DQUOT_USAGE_ENABLED | 2315884d179dSJan Kara DQUOT_LIMITS_ENABLED); 2316884d179dSJan Kara return error; 2317884d179dSJan Kara } 2318287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_quota_on); 2319884d179dSJan Kara 2320884d179dSJan Kara /* 2321884d179dSJan Kara * More powerful function for turning on quotas allowing setting 2322884d179dSJan Kara * of individual quota flags 2323884d179dSJan Kara */ 2324287a8095SChristoph Hellwig int dquot_enable(struct inode *inode, int type, int format_id, 2325884d179dSJan Kara unsigned int flags) 2326884d179dSJan Kara { 2327884d179dSJan Kara int ret = 0; 2328884d179dSJan Kara struct super_block *sb = inode->i_sb; 2329884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 2330884d179dSJan Kara 2331884d179dSJan Kara /* Just unsuspend quotas? */ 23320f0dd62fSChristoph Hellwig BUG_ON(flags & DQUOT_SUSPENDED); 23330f0dd62fSChristoph Hellwig 2334884d179dSJan Kara if (!flags) 2335884d179dSJan Kara return 0; 2336884d179dSJan Kara /* Just updating flags needed? */ 2337884d179dSJan Kara if (sb_has_quota_loaded(sb, type)) { 2338884d179dSJan Kara mutex_lock(&dqopt->dqonoff_mutex); 2339884d179dSJan Kara /* Now do a reliable test... */ 2340884d179dSJan Kara if (!sb_has_quota_loaded(sb, type)) { 2341884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 2342884d179dSJan Kara goto load_quota; 2343884d179dSJan Kara } 2344884d179dSJan Kara if (flags & DQUOT_USAGE_ENABLED && 2345884d179dSJan Kara sb_has_quota_usage_enabled(sb, type)) { 2346884d179dSJan Kara ret = -EBUSY; 2347884d179dSJan Kara goto out_lock; 2348884d179dSJan Kara } 2349884d179dSJan Kara if (flags & DQUOT_LIMITS_ENABLED && 2350884d179dSJan Kara sb_has_quota_limits_enabled(sb, type)) { 2351884d179dSJan Kara ret = -EBUSY; 2352884d179dSJan Kara goto out_lock; 2353884d179dSJan Kara } 2354884d179dSJan Kara spin_lock(&dq_state_lock); 2355884d179dSJan Kara sb_dqopt(sb)->flags |= dquot_state_flag(flags, type); 2356884d179dSJan Kara spin_unlock(&dq_state_lock); 2357884d179dSJan Kara out_lock: 2358884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 2359884d179dSJan Kara return ret; 2360884d179dSJan Kara } 2361884d179dSJan Kara 2362884d179dSJan Kara load_quota: 2363884d179dSJan Kara return vfs_load_quota_inode(inode, type, format_id, flags); 2364884d179dSJan Kara } 2365287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_enable); 2366884d179dSJan Kara 2367884d179dSJan Kara /* 2368884d179dSJan Kara * This function is used when filesystem needs to initialize quotas 2369884d179dSJan Kara * during mount time. 2370884d179dSJan Kara */ 2371287a8095SChristoph Hellwig int dquot_quota_on_mount(struct super_block *sb, char *qf_name, 2372884d179dSJan Kara int format_id, int type) 2373884d179dSJan Kara { 2374884d179dSJan Kara struct dentry *dentry; 2375884d179dSJan Kara int error; 2376884d179dSJan Kara 2377c56818d7SJan Kara mutex_lock(&sb->s_root->d_inode->i_mutex); 2378884d179dSJan Kara dentry = lookup_one_len(qf_name, sb->s_root, strlen(qf_name)); 2379c56818d7SJan Kara mutex_unlock(&sb->s_root->d_inode->i_mutex); 2380884d179dSJan Kara if (IS_ERR(dentry)) 2381884d179dSJan Kara return PTR_ERR(dentry); 2382884d179dSJan Kara 2383884d179dSJan Kara if (!dentry->d_inode) { 2384884d179dSJan Kara error = -ENOENT; 2385884d179dSJan Kara goto out; 2386884d179dSJan Kara } 2387884d179dSJan Kara 2388884d179dSJan Kara error = security_quota_on(dentry); 2389884d179dSJan Kara if (!error) 2390884d179dSJan Kara error = vfs_load_quota_inode(dentry->d_inode, type, format_id, 2391884d179dSJan Kara DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); 2392884d179dSJan Kara 2393884d179dSJan Kara out: 2394884d179dSJan Kara dput(dentry); 2395884d179dSJan Kara return error; 2396884d179dSJan Kara } 2397287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_quota_on_mount); 2398884d179dSJan Kara 2399884d179dSJan Kara static inline qsize_t qbtos(qsize_t blocks) 2400884d179dSJan Kara { 2401884d179dSJan Kara return blocks << QIF_DQBLKSIZE_BITS; 2402884d179dSJan Kara } 2403884d179dSJan Kara 2404884d179dSJan Kara static inline qsize_t stoqb(qsize_t space) 2405884d179dSJan Kara { 2406884d179dSJan Kara return (space + QIF_DQBLKSIZE - 1) >> QIF_DQBLKSIZE_BITS; 2407884d179dSJan Kara } 2408884d179dSJan Kara 2409884d179dSJan Kara /* Generic routine for getting common part of quota structure */ 2410b9b2dd36SChristoph Hellwig static void do_get_dqblk(struct dquot *dquot, struct fs_disk_quota *di) 2411884d179dSJan Kara { 2412884d179dSJan Kara struct mem_dqblk *dm = &dquot->dq_dqb; 2413884d179dSJan Kara 2414b9b2dd36SChristoph Hellwig memset(di, 0, sizeof(*di)); 2415b9b2dd36SChristoph Hellwig di->d_version = FS_DQUOT_VERSION; 24164c376dcaSEric W. Biederman di->d_flags = dquot->dq_id.type == USRQUOTA ? 2417ade7ce31SChristoph Hellwig FS_USER_QUOTA : FS_GROUP_QUOTA; 24184c376dcaSEric W. Biederman di->d_id = from_kqid_munged(current_user_ns(), dquot->dq_id); 2419b9b2dd36SChristoph Hellwig 2420884d179dSJan Kara spin_lock(&dq_data_lock); 2421b9b2dd36SChristoph Hellwig di->d_blk_hardlimit = stoqb(dm->dqb_bhardlimit); 2422b9b2dd36SChristoph Hellwig di->d_blk_softlimit = stoqb(dm->dqb_bsoftlimit); 2423b9b2dd36SChristoph Hellwig di->d_ino_hardlimit = dm->dqb_ihardlimit; 2424b9b2dd36SChristoph Hellwig di->d_ino_softlimit = dm->dqb_isoftlimit; 2425b9b2dd36SChristoph Hellwig di->d_bcount = dm->dqb_curspace + dm->dqb_rsvspace; 2426b9b2dd36SChristoph Hellwig di->d_icount = dm->dqb_curinodes; 2427b9b2dd36SChristoph Hellwig di->d_btimer = dm->dqb_btime; 2428b9b2dd36SChristoph Hellwig di->d_itimer = dm->dqb_itime; 2429884d179dSJan Kara spin_unlock(&dq_data_lock); 2430884d179dSJan Kara } 2431884d179dSJan Kara 243274a8a103SEric W. Biederman int dquot_get_dqblk(struct super_block *sb, struct kqid qid, 2433b9b2dd36SChristoph Hellwig struct fs_disk_quota *di) 2434884d179dSJan Kara { 2435884d179dSJan Kara struct dquot *dquot; 2436884d179dSJan Kara 2437aca645a6SEric W. Biederman dquot = dqget(sb, qid); 2438dd6f3c6dSJan Kara if (!dquot) 2439884d179dSJan Kara return -ESRCH; 2440884d179dSJan Kara do_get_dqblk(dquot, di); 2441884d179dSJan Kara dqput(dquot); 2442884d179dSJan Kara 2443884d179dSJan Kara return 0; 2444884d179dSJan Kara } 2445287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_get_dqblk); 2446884d179dSJan Kara 2447c472b432SChristoph Hellwig #define VFS_FS_DQ_MASK \ 2448c472b432SChristoph Hellwig (FS_DQ_BCOUNT | FS_DQ_BSOFT | FS_DQ_BHARD | \ 2449c472b432SChristoph Hellwig FS_DQ_ICOUNT | FS_DQ_ISOFT | FS_DQ_IHARD | \ 2450c472b432SChristoph Hellwig FS_DQ_BTIMER | FS_DQ_ITIMER) 2451c472b432SChristoph Hellwig 2452884d179dSJan Kara /* Generic routine for setting common part of quota structure */ 2453c472b432SChristoph Hellwig static int do_set_dqblk(struct dquot *dquot, struct fs_disk_quota *di) 2454884d179dSJan Kara { 2455884d179dSJan Kara struct mem_dqblk *dm = &dquot->dq_dqb; 2456884d179dSJan Kara int check_blim = 0, check_ilim = 0; 24574c376dcaSEric W. Biederman struct mem_dqinfo *dqi = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_id.type]; 2458884d179dSJan Kara 2459c472b432SChristoph Hellwig if (di->d_fieldmask & ~VFS_FS_DQ_MASK) 2460c472b432SChristoph Hellwig return -EINVAL; 2461c472b432SChristoph Hellwig 2462c472b432SChristoph Hellwig if (((di->d_fieldmask & FS_DQ_BSOFT) && 2463c472b432SChristoph Hellwig (di->d_blk_softlimit > dqi->dqi_maxblimit)) || 2464c472b432SChristoph Hellwig ((di->d_fieldmask & FS_DQ_BHARD) && 2465c472b432SChristoph Hellwig (di->d_blk_hardlimit > dqi->dqi_maxblimit)) || 2466c472b432SChristoph Hellwig ((di->d_fieldmask & FS_DQ_ISOFT) && 2467c472b432SChristoph Hellwig (di->d_ino_softlimit > dqi->dqi_maxilimit)) || 2468c472b432SChristoph Hellwig ((di->d_fieldmask & FS_DQ_IHARD) && 2469c472b432SChristoph Hellwig (di->d_ino_hardlimit > dqi->dqi_maxilimit))) 2470884d179dSJan Kara return -ERANGE; 2471884d179dSJan Kara 2472884d179dSJan Kara spin_lock(&dq_data_lock); 2473c472b432SChristoph Hellwig if (di->d_fieldmask & FS_DQ_BCOUNT) { 2474c472b432SChristoph Hellwig dm->dqb_curspace = di->d_bcount - dm->dqb_rsvspace; 2475884d179dSJan Kara check_blim = 1; 247608261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags); 2477884d179dSJan Kara } 2478c472b432SChristoph Hellwig 2479c472b432SChristoph Hellwig if (di->d_fieldmask & FS_DQ_BSOFT) 2480c472b432SChristoph Hellwig dm->dqb_bsoftlimit = qbtos(di->d_blk_softlimit); 2481c472b432SChristoph Hellwig if (di->d_fieldmask & FS_DQ_BHARD) 2482c472b432SChristoph Hellwig dm->dqb_bhardlimit = qbtos(di->d_blk_hardlimit); 2483c472b432SChristoph Hellwig if (di->d_fieldmask & (FS_DQ_BSOFT | FS_DQ_BHARD)) { 2484884d179dSJan Kara check_blim = 1; 248508261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags); 2486884d179dSJan Kara } 2487c472b432SChristoph Hellwig 2488c472b432SChristoph Hellwig if (di->d_fieldmask & FS_DQ_ICOUNT) { 2489c472b432SChristoph Hellwig dm->dqb_curinodes = di->d_icount; 2490884d179dSJan Kara check_ilim = 1; 249108261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags); 2492884d179dSJan Kara } 2493c472b432SChristoph Hellwig 2494c472b432SChristoph Hellwig if (di->d_fieldmask & FS_DQ_ISOFT) 2495c472b432SChristoph Hellwig dm->dqb_isoftlimit = di->d_ino_softlimit; 2496c472b432SChristoph Hellwig if (di->d_fieldmask & FS_DQ_IHARD) 2497c472b432SChristoph Hellwig dm->dqb_ihardlimit = di->d_ino_hardlimit; 2498c472b432SChristoph Hellwig if (di->d_fieldmask & (FS_DQ_ISOFT | FS_DQ_IHARD)) { 2499884d179dSJan Kara check_ilim = 1; 250008261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags); 2501884d179dSJan Kara } 2502c472b432SChristoph Hellwig 2503c472b432SChristoph Hellwig if (di->d_fieldmask & FS_DQ_BTIMER) { 2504c472b432SChristoph Hellwig dm->dqb_btime = di->d_btimer; 2505884d179dSJan Kara check_blim = 1; 250608261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags); 2507884d179dSJan Kara } 2508c472b432SChristoph Hellwig 2509c472b432SChristoph Hellwig if (di->d_fieldmask & FS_DQ_ITIMER) { 2510c472b432SChristoph Hellwig dm->dqb_itime = di->d_itimer; 2511884d179dSJan Kara check_ilim = 1; 251208261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags); 2513884d179dSJan Kara } 2514884d179dSJan Kara 2515884d179dSJan Kara if (check_blim) { 2516268157baSJan Kara if (!dm->dqb_bsoftlimit || 2517268157baSJan Kara dm->dqb_curspace < dm->dqb_bsoftlimit) { 2518884d179dSJan Kara dm->dqb_btime = 0; 2519884d179dSJan Kara clear_bit(DQ_BLKS_B, &dquot->dq_flags); 2520c472b432SChristoph Hellwig } else if (!(di->d_fieldmask & FS_DQ_BTIMER)) 2521268157baSJan Kara /* Set grace only if user hasn't provided his own... */ 2522884d179dSJan Kara dm->dqb_btime = get_seconds() + dqi->dqi_bgrace; 2523884d179dSJan Kara } 2524884d179dSJan Kara if (check_ilim) { 2525268157baSJan Kara if (!dm->dqb_isoftlimit || 2526268157baSJan Kara dm->dqb_curinodes < dm->dqb_isoftlimit) { 2527884d179dSJan Kara dm->dqb_itime = 0; 2528884d179dSJan Kara clear_bit(DQ_INODES_B, &dquot->dq_flags); 2529c472b432SChristoph Hellwig } else if (!(di->d_fieldmask & FS_DQ_ITIMER)) 2530268157baSJan Kara /* Set grace only if user hasn't provided his own... */ 2531884d179dSJan Kara dm->dqb_itime = get_seconds() + dqi->dqi_igrace; 2532884d179dSJan Kara } 2533268157baSJan Kara if (dm->dqb_bhardlimit || dm->dqb_bsoftlimit || dm->dqb_ihardlimit || 2534268157baSJan Kara dm->dqb_isoftlimit) 2535884d179dSJan Kara clear_bit(DQ_FAKE_B, &dquot->dq_flags); 2536884d179dSJan Kara else 2537884d179dSJan Kara set_bit(DQ_FAKE_B, &dquot->dq_flags); 2538884d179dSJan Kara spin_unlock(&dq_data_lock); 2539884d179dSJan Kara mark_dquot_dirty(dquot); 2540884d179dSJan Kara 2541884d179dSJan Kara return 0; 2542884d179dSJan Kara } 2543884d179dSJan Kara 254474a8a103SEric W. Biederman int dquot_set_dqblk(struct super_block *sb, struct kqid qid, 2545c472b432SChristoph Hellwig struct fs_disk_quota *di) 2546884d179dSJan Kara { 2547884d179dSJan Kara struct dquot *dquot; 2548884d179dSJan Kara int rc; 2549884d179dSJan Kara 2550aca645a6SEric W. Biederman dquot = dqget(sb, qid); 2551884d179dSJan Kara if (!dquot) { 2552884d179dSJan Kara rc = -ESRCH; 2553884d179dSJan Kara goto out; 2554884d179dSJan Kara } 2555884d179dSJan Kara rc = do_set_dqblk(dquot, di); 2556884d179dSJan Kara dqput(dquot); 2557884d179dSJan Kara out: 2558884d179dSJan Kara return rc; 2559884d179dSJan Kara } 2560287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_set_dqblk); 2561884d179dSJan Kara 2562884d179dSJan Kara /* Generic routine for getting common part of quota file information */ 2563287a8095SChristoph Hellwig int dquot_get_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii) 2564884d179dSJan Kara { 2565884d179dSJan Kara struct mem_dqinfo *mi; 2566884d179dSJan Kara 2567884d179dSJan Kara mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); 2568884d179dSJan Kara if (!sb_has_quota_active(sb, type)) { 2569884d179dSJan Kara mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); 2570884d179dSJan Kara return -ESRCH; 2571884d179dSJan Kara } 2572884d179dSJan Kara mi = sb_dqopt(sb)->info + type; 2573884d179dSJan Kara spin_lock(&dq_data_lock); 2574884d179dSJan Kara ii->dqi_bgrace = mi->dqi_bgrace; 2575884d179dSJan Kara ii->dqi_igrace = mi->dqi_igrace; 257646fe44ceSJan Kara ii->dqi_flags = mi->dqi_flags & DQF_GETINFO_MASK; 2577884d179dSJan Kara ii->dqi_valid = IIF_ALL; 2578884d179dSJan Kara spin_unlock(&dq_data_lock); 2579884d179dSJan Kara mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); 2580884d179dSJan Kara return 0; 2581884d179dSJan Kara } 2582287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_get_dqinfo); 2583884d179dSJan Kara 2584884d179dSJan Kara /* Generic routine for setting common part of quota file information */ 2585287a8095SChristoph Hellwig int dquot_set_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii) 2586884d179dSJan Kara { 2587884d179dSJan Kara struct mem_dqinfo *mi; 2588884d179dSJan Kara int err = 0; 2589884d179dSJan Kara 2590884d179dSJan Kara mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); 2591884d179dSJan Kara if (!sb_has_quota_active(sb, type)) { 2592884d179dSJan Kara err = -ESRCH; 2593884d179dSJan Kara goto out; 2594884d179dSJan Kara } 2595884d179dSJan Kara mi = sb_dqopt(sb)->info + type; 2596884d179dSJan Kara spin_lock(&dq_data_lock); 2597884d179dSJan Kara if (ii->dqi_valid & IIF_BGRACE) 2598884d179dSJan Kara mi->dqi_bgrace = ii->dqi_bgrace; 2599884d179dSJan Kara if (ii->dqi_valid & IIF_IGRACE) 2600884d179dSJan Kara mi->dqi_igrace = ii->dqi_igrace; 2601884d179dSJan Kara if (ii->dqi_valid & IIF_FLAGS) 260246fe44ceSJan Kara mi->dqi_flags = (mi->dqi_flags & ~DQF_SETINFO_MASK) | 260346fe44ceSJan Kara (ii->dqi_flags & DQF_SETINFO_MASK); 2604884d179dSJan Kara spin_unlock(&dq_data_lock); 2605884d179dSJan Kara mark_info_dirty(sb, type); 2606884d179dSJan Kara /* Force write to disk */ 2607884d179dSJan Kara sb->dq_op->write_info(sb, type); 2608884d179dSJan Kara out: 2609884d179dSJan Kara mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); 2610884d179dSJan Kara return err; 2611884d179dSJan Kara } 2612287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_set_dqinfo); 2613884d179dSJan Kara 2614287a8095SChristoph Hellwig const struct quotactl_ops dquot_quotactl_ops = { 2615287a8095SChristoph Hellwig .quota_on = dquot_quota_on, 2616287a8095SChristoph Hellwig .quota_off = dquot_quota_off, 2617287a8095SChristoph Hellwig .quota_sync = dquot_quota_sync, 2618287a8095SChristoph Hellwig .get_info = dquot_get_dqinfo, 2619287a8095SChristoph Hellwig .set_info = dquot_set_dqinfo, 2620287a8095SChristoph Hellwig .get_dqblk = dquot_get_dqblk, 2621287a8095SChristoph Hellwig .set_dqblk = dquot_set_dqblk 2622884d179dSJan Kara }; 2623287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_quotactl_ops); 2624dde95888SDmitry Monakhov 2625dde95888SDmitry Monakhov static int do_proc_dqstats(struct ctl_table *table, int write, 2626dde95888SDmitry Monakhov void __user *buffer, size_t *lenp, loff_t *ppos) 2627dde95888SDmitry Monakhov { 2628dde95888SDmitry Monakhov unsigned int type = (int *)table->data - dqstats.stat; 2629f32764bdSDmitry Monakhov 2630f32764bdSDmitry Monakhov /* Update global table */ 2631f32764bdSDmitry Monakhov dqstats.stat[type] = 2632f32764bdSDmitry Monakhov percpu_counter_sum_positive(&dqstats.counter[type]); 2633dde95888SDmitry Monakhov return proc_dointvec(table, write, buffer, lenp, ppos); 2634dde95888SDmitry Monakhov } 2635dde95888SDmitry Monakhov 2636e628753bSJoe Perches static struct ctl_table fs_dqstats_table[] = { 2637884d179dSJan Kara { 2638884d179dSJan Kara .procname = "lookups", 2639dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_LOOKUPS], 2640884d179dSJan Kara .maxlen = sizeof(int), 2641884d179dSJan Kara .mode = 0444, 2642dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2643884d179dSJan Kara }, 2644884d179dSJan Kara { 2645884d179dSJan Kara .procname = "drops", 2646dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_DROPS], 2647884d179dSJan Kara .maxlen = sizeof(int), 2648884d179dSJan Kara .mode = 0444, 2649dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2650884d179dSJan Kara }, 2651884d179dSJan Kara { 2652884d179dSJan Kara .procname = "reads", 2653dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_READS], 2654884d179dSJan Kara .maxlen = sizeof(int), 2655884d179dSJan Kara .mode = 0444, 2656dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2657884d179dSJan Kara }, 2658884d179dSJan Kara { 2659884d179dSJan Kara .procname = "writes", 2660dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_WRITES], 2661884d179dSJan Kara .maxlen = sizeof(int), 2662884d179dSJan Kara .mode = 0444, 2663dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2664884d179dSJan Kara }, 2665884d179dSJan Kara { 2666884d179dSJan Kara .procname = "cache_hits", 2667dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_CACHE_HITS], 2668884d179dSJan Kara .maxlen = sizeof(int), 2669884d179dSJan Kara .mode = 0444, 2670dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2671884d179dSJan Kara }, 2672884d179dSJan Kara { 2673884d179dSJan Kara .procname = "allocated_dquots", 2674dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_ALLOC_DQUOTS], 2675884d179dSJan Kara .maxlen = sizeof(int), 2676884d179dSJan Kara .mode = 0444, 2677dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2678884d179dSJan Kara }, 2679884d179dSJan Kara { 2680884d179dSJan Kara .procname = "free_dquots", 2681dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_FREE_DQUOTS], 2682884d179dSJan Kara .maxlen = sizeof(int), 2683884d179dSJan Kara .mode = 0444, 2684dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2685884d179dSJan Kara }, 2686884d179dSJan Kara { 2687884d179dSJan Kara .procname = "syncs", 2688dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_SYNCS], 2689884d179dSJan Kara .maxlen = sizeof(int), 2690884d179dSJan Kara .mode = 0444, 2691dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2692884d179dSJan Kara }, 2693884d179dSJan Kara #ifdef CONFIG_PRINT_QUOTA_WARNING 2694884d179dSJan Kara { 2695884d179dSJan Kara .procname = "warnings", 2696884d179dSJan Kara .data = &flag_print_warnings, 2697884d179dSJan Kara .maxlen = sizeof(int), 2698884d179dSJan Kara .mode = 0644, 26996d456111SEric W. Biederman .proc_handler = proc_dointvec, 2700884d179dSJan Kara }, 2701884d179dSJan Kara #endif 2702ab09203eSEric W. Biederman { }, 2703884d179dSJan Kara }; 2704884d179dSJan Kara 2705e628753bSJoe Perches static struct ctl_table fs_table[] = { 2706884d179dSJan Kara { 2707884d179dSJan Kara .procname = "quota", 2708884d179dSJan Kara .mode = 0555, 2709884d179dSJan Kara .child = fs_dqstats_table, 2710884d179dSJan Kara }, 2711ab09203eSEric W. Biederman { }, 2712884d179dSJan Kara }; 2713884d179dSJan Kara 2714e628753bSJoe Perches static struct ctl_table sys_table[] = { 2715884d179dSJan Kara { 2716884d179dSJan Kara .procname = "fs", 2717884d179dSJan Kara .mode = 0555, 2718884d179dSJan Kara .child = fs_table, 2719884d179dSJan Kara }, 2720ab09203eSEric W. Biederman { }, 2721884d179dSJan Kara }; 2722884d179dSJan Kara 2723884d179dSJan Kara static int __init dquot_init(void) 2724884d179dSJan Kara { 2725f32764bdSDmitry Monakhov int i, ret; 2726884d179dSJan Kara unsigned long nr_hash, order; 2727884d179dSJan Kara 2728884d179dSJan Kara printk(KERN_NOTICE "VFS: Disk quotas %s\n", __DQUOT_VERSION__); 2729884d179dSJan Kara 2730884d179dSJan Kara register_sysctl_table(sys_table); 2731884d179dSJan Kara 2732884d179dSJan Kara dquot_cachep = kmem_cache_create("dquot", 2733884d179dSJan Kara sizeof(struct dquot), sizeof(unsigned long) * 4, 2734884d179dSJan Kara (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| 2735884d179dSJan Kara SLAB_MEM_SPREAD|SLAB_PANIC), 2736884d179dSJan Kara NULL); 2737884d179dSJan Kara 2738884d179dSJan Kara order = 0; 2739884d179dSJan Kara dquot_hash = (struct hlist_head *)__get_free_pages(GFP_ATOMIC, order); 2740884d179dSJan Kara if (!dquot_hash) 2741884d179dSJan Kara panic("Cannot create dquot hash table"); 2742884d179dSJan Kara 2743f32764bdSDmitry Monakhov for (i = 0; i < _DQST_DQSTAT_LAST; i++) { 2744f32764bdSDmitry Monakhov ret = percpu_counter_init(&dqstats.counter[i], 0); 2745f32764bdSDmitry Monakhov if (ret) 2746f32764bdSDmitry Monakhov panic("Cannot create dquot stat counters"); 2747f32764bdSDmitry Monakhov } 2748dde95888SDmitry Monakhov 2749884d179dSJan Kara /* Find power-of-two hlist_heads which can fit into allocation */ 2750884d179dSJan Kara nr_hash = (1UL << order) * PAGE_SIZE / sizeof(struct hlist_head); 2751884d179dSJan Kara dq_hash_bits = 0; 2752884d179dSJan Kara do { 2753884d179dSJan Kara dq_hash_bits++; 2754884d179dSJan Kara } while (nr_hash >> dq_hash_bits); 2755884d179dSJan Kara dq_hash_bits--; 2756884d179dSJan Kara 2757884d179dSJan Kara nr_hash = 1UL << dq_hash_bits; 2758884d179dSJan Kara dq_hash_mask = nr_hash - 1; 2759884d179dSJan Kara for (i = 0; i < nr_hash; i++) 2760884d179dSJan Kara INIT_HLIST_HEAD(dquot_hash + i); 2761884d179dSJan Kara 2762884d179dSJan Kara printk("Dquot-cache hash table entries: %ld (order %ld, %ld bytes)\n", 2763884d179dSJan Kara nr_hash, order, (PAGE_SIZE << order)); 2764884d179dSJan Kara 2765884d179dSJan Kara register_shrinker(&dqcache_shrinker); 2766884d179dSJan Kara 2767884d179dSJan Kara return 0; 2768884d179dSJan Kara } 2769884d179dSJan Kara module_init(dquot_init); 2770