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 531884d179dSJan Kara atomic_inc(&dquot->dq_count); 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; 584884d179dSJan Kara ret = fn(dquot, priv); 585884d179dSJan Kara if (ret < 0) 586884d179dSJan Kara goto out; 587884d179dSJan Kara spin_lock(&dq_list_lock); 588884d179dSJan Kara /* We are safe to continue now because our dquot could not 589884d179dSJan Kara * be moved out of the inuse list while we hold the reference */ 590884d179dSJan Kara } 591884d179dSJan Kara spin_unlock(&dq_list_lock); 592884d179dSJan Kara out: 593884d179dSJan Kara dqput(old_dquot); 594884d179dSJan Kara mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); 595884d179dSJan Kara return ret; 596884d179dSJan Kara } 597884d179dSJan Kara EXPORT_SYMBOL(dquot_scan_active); 598884d179dSJan Kara 599ceed1723SJan Kara /* Write all dquot structures to quota files */ 600ceed1723SJan Kara int dquot_writeback_dquots(struct super_block *sb, int type) 601884d179dSJan Kara { 602884d179dSJan Kara struct list_head *dirty; 603884d179dSJan Kara struct dquot *dquot; 604884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 605884d179dSJan Kara int cnt; 606ceed1723SJan Kara int err, ret = 0; 607884d179dSJan Kara 608884d179dSJan Kara mutex_lock(&dqopt->dqonoff_mutex); 609884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 610884d179dSJan Kara if (type != -1 && cnt != type) 611884d179dSJan Kara continue; 612884d179dSJan Kara if (!sb_has_quota_active(sb, cnt)) 613884d179dSJan Kara continue; 614884d179dSJan Kara spin_lock(&dq_list_lock); 615884d179dSJan Kara dirty = &dqopt->info[cnt].dqi_dirty_list; 616884d179dSJan Kara while (!list_empty(dirty)) { 617268157baSJan Kara dquot = list_first_entry(dirty, struct dquot, 618268157baSJan Kara dq_dirty); 619884d179dSJan Kara /* Dirty and inactive can be only bad dquot... */ 620884d179dSJan Kara if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { 621884d179dSJan Kara clear_dquot_dirty(dquot); 622884d179dSJan Kara continue; 623884d179dSJan Kara } 624884d179dSJan Kara /* Now we have active dquot from which someone is 625884d179dSJan Kara * holding reference so we can safely just increase 626884d179dSJan Kara * use count */ 627884d179dSJan Kara atomic_inc(&dquot->dq_count); 628884d179dSJan Kara spin_unlock(&dq_list_lock); 629dde95888SDmitry Monakhov dqstats_inc(DQST_LOOKUPS); 630ceed1723SJan Kara err = sb->dq_op->write_dquot(dquot); 631ceed1723SJan Kara if (!ret && err) 632ceed1723SJan Kara err = ret; 633884d179dSJan Kara dqput(dquot); 634884d179dSJan Kara spin_lock(&dq_list_lock); 635884d179dSJan Kara } 636884d179dSJan Kara spin_unlock(&dq_list_lock); 637884d179dSJan Kara } 638884d179dSJan Kara 639884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 640884d179dSJan Kara if ((cnt == type || type == -1) && sb_has_quota_active(sb, cnt) 641884d179dSJan Kara && info_dirty(&dqopt->info[cnt])) 642884d179dSJan Kara sb->dq_op->write_info(sb, cnt); 643dde95888SDmitry Monakhov dqstats_inc(DQST_SYNCS); 644884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 645884d179dSJan Kara 646ceed1723SJan Kara return ret; 647ceed1723SJan Kara } 648ceed1723SJan Kara EXPORT_SYMBOL(dquot_writeback_dquots); 649ceed1723SJan Kara 650ceed1723SJan Kara /* Write all dquot structures to disk and make them visible from userspace */ 651ceed1723SJan Kara int dquot_quota_sync(struct super_block *sb, int type) 652ceed1723SJan Kara { 653ceed1723SJan Kara struct quota_info *dqopt = sb_dqopt(sb); 654ceed1723SJan Kara int cnt; 655ceed1723SJan Kara int ret; 656ceed1723SJan Kara 657ceed1723SJan Kara ret = dquot_writeback_dquots(sb, type); 658ceed1723SJan Kara if (ret) 659ceed1723SJan Kara return ret; 660ceed1723SJan Kara if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) 6615fb324adSChristoph Hellwig return 0; 6625fb324adSChristoph Hellwig 6635fb324adSChristoph Hellwig /* This is not very clever (and fast) but currently I don't know about 6645fb324adSChristoph Hellwig * any other simple way of getting quota data to disk and we must get 6655fb324adSChristoph Hellwig * them there for userspace to be visible... */ 6665fb324adSChristoph Hellwig if (sb->s_op->sync_fs) 6675fb324adSChristoph Hellwig sb->s_op->sync_fs(sb, 1); 6685fb324adSChristoph Hellwig sync_blockdev(sb->s_bdev); 6695fb324adSChristoph Hellwig 6705fb324adSChristoph Hellwig /* 6715fb324adSChristoph Hellwig * Now when everything is written we can discard the pagecache so 6725fb324adSChristoph Hellwig * that userspace sees the changes. 6735fb324adSChristoph Hellwig */ 674f9ef1784SJan Kara mutex_lock(&dqopt->dqonoff_mutex); 6755fb324adSChristoph Hellwig for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 6765fb324adSChristoph Hellwig if (type != -1 && cnt != type) 6775fb324adSChristoph Hellwig continue; 6785fb324adSChristoph Hellwig if (!sb_has_quota_active(sb, cnt)) 6795fb324adSChristoph Hellwig continue; 680a80b12c3SJan Kara mutex_lock(&dqopt->files[cnt]->i_mutex); 681f9ef1784SJan Kara truncate_inode_pages(&dqopt->files[cnt]->i_data, 0); 682f9ef1784SJan Kara mutex_unlock(&dqopt->files[cnt]->i_mutex); 6835fb324adSChristoph Hellwig } 684f9ef1784SJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 6855fb324adSChristoph Hellwig 686884d179dSJan Kara return 0; 687884d179dSJan Kara } 688287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_quota_sync); 689884d179dSJan Kara 690884d179dSJan Kara /* Free unused dquots from cache */ 691884d179dSJan Kara static void prune_dqcache(int count) 692884d179dSJan Kara { 693884d179dSJan Kara struct list_head *head; 694884d179dSJan Kara struct dquot *dquot; 695884d179dSJan Kara 696884d179dSJan Kara head = free_dquots.prev; 697884d179dSJan Kara while (head != &free_dquots && count) { 698884d179dSJan Kara dquot = list_entry(head, struct dquot, dq_free); 699884d179dSJan Kara remove_dquot_hash(dquot); 700884d179dSJan Kara remove_free_dquot(dquot); 701884d179dSJan Kara remove_inuse(dquot); 702884d179dSJan Kara do_destroy_dquot(dquot); 703884d179dSJan Kara count--; 704884d179dSJan Kara head = free_dquots.prev; 705884d179dSJan Kara } 706884d179dSJan Kara } 707884d179dSJan Kara 708884d179dSJan Kara /* 709884d179dSJan Kara * This is called from kswapd when we think we need some 710884d179dSJan Kara * more memory 711884d179dSJan Kara */ 7121495f230SYing Han static int shrink_dqcache_memory(struct shrinker *shrink, 7131495f230SYing Han struct shrink_control *sc) 714884d179dSJan Kara { 7151495f230SYing Han int nr = sc->nr_to_scan; 7161495f230SYing Han 717884d179dSJan Kara if (nr) { 718884d179dSJan Kara spin_lock(&dq_list_lock); 719884d179dSJan Kara prune_dqcache(nr); 720884d179dSJan Kara spin_unlock(&dq_list_lock); 721884d179dSJan Kara } 722f32764bdSDmitry Monakhov return ((unsigned) 723f32764bdSDmitry Monakhov percpu_counter_read_positive(&dqstats.counter[DQST_FREE_DQUOTS]) 724f32764bdSDmitry Monakhov /100) * sysctl_vfs_cache_pressure; 725884d179dSJan Kara } 726884d179dSJan Kara 727884d179dSJan Kara static struct shrinker dqcache_shrinker = { 728884d179dSJan Kara .shrink = shrink_dqcache_memory, 729884d179dSJan Kara .seeks = DEFAULT_SEEKS, 730884d179dSJan Kara }; 731884d179dSJan Kara 732884d179dSJan Kara /* 733884d179dSJan Kara * Put reference to dquot 734884d179dSJan Kara * NOTE: If you change this function please check whether dqput_blocks() works right... 735884d179dSJan Kara */ 736884d179dSJan Kara void dqput(struct dquot *dquot) 737884d179dSJan Kara { 738884d179dSJan Kara int ret; 739884d179dSJan Kara 740884d179dSJan Kara if (!dquot) 741884d179dSJan Kara return; 74262af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 743884d179dSJan Kara if (!atomic_read(&dquot->dq_count)) { 744fb5ffb0eSJiaying Zhang quota_error(dquot->dq_sb, "trying to free free dquot of %s %d", 7454c376dcaSEric W. Biederman quotatypes[dquot->dq_id.type], 7464c376dcaSEric W. Biederman from_kqid(&init_user_ns, dquot->dq_id)); 747884d179dSJan Kara BUG(); 748884d179dSJan Kara } 749884d179dSJan Kara #endif 750dde95888SDmitry Monakhov dqstats_inc(DQST_DROPS); 751884d179dSJan Kara we_slept: 752884d179dSJan Kara spin_lock(&dq_list_lock); 753884d179dSJan Kara if (atomic_read(&dquot->dq_count) > 1) { 754884d179dSJan Kara /* We have more than one user... nothing to do */ 755884d179dSJan Kara atomic_dec(&dquot->dq_count); 756884d179dSJan Kara /* Releasing dquot during quotaoff phase? */ 7574c376dcaSEric W. Biederman if (!sb_has_quota_active(dquot->dq_sb, dquot->dq_id.type) && 758884d179dSJan Kara atomic_read(&dquot->dq_count) == 1) 759884d179dSJan Kara wake_up(&dquot->dq_wait_unused); 760884d179dSJan Kara spin_unlock(&dq_list_lock); 761884d179dSJan Kara return; 762884d179dSJan Kara } 763884d179dSJan Kara /* Need to release dquot? */ 764884d179dSJan Kara if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && dquot_dirty(dquot)) { 765884d179dSJan Kara spin_unlock(&dq_list_lock); 766884d179dSJan Kara /* Commit dquot before releasing */ 767884d179dSJan Kara ret = dquot->dq_sb->dq_op->write_dquot(dquot); 768884d179dSJan Kara if (ret < 0) { 769fb5ffb0eSJiaying Zhang quota_error(dquot->dq_sb, "Can't write quota structure" 770fb5ffb0eSJiaying Zhang " (error %d). Quota may get out of sync!", 771fb5ffb0eSJiaying Zhang ret); 772884d179dSJan Kara /* 773884d179dSJan Kara * We clear dirty bit anyway, so that we avoid 774884d179dSJan Kara * infinite loop here 775884d179dSJan Kara */ 776884d179dSJan Kara spin_lock(&dq_list_lock); 777884d179dSJan Kara clear_dquot_dirty(dquot); 778884d179dSJan Kara spin_unlock(&dq_list_lock); 779884d179dSJan Kara } 780884d179dSJan Kara goto we_slept; 781884d179dSJan Kara } 782884d179dSJan Kara /* Clear flag in case dquot was inactive (something bad happened) */ 783884d179dSJan Kara clear_dquot_dirty(dquot); 784884d179dSJan Kara if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { 785884d179dSJan Kara spin_unlock(&dq_list_lock); 786884d179dSJan Kara dquot->dq_sb->dq_op->release_dquot(dquot); 787884d179dSJan Kara goto we_slept; 788884d179dSJan Kara } 789884d179dSJan Kara atomic_dec(&dquot->dq_count); 79062af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 791884d179dSJan Kara /* sanity check */ 792884d179dSJan Kara BUG_ON(!list_empty(&dquot->dq_free)); 793884d179dSJan Kara #endif 794884d179dSJan Kara put_dquot_last(dquot); 795884d179dSJan Kara spin_unlock(&dq_list_lock); 796884d179dSJan Kara } 797884d179dSJan Kara EXPORT_SYMBOL(dqput); 798884d179dSJan Kara 799884d179dSJan Kara struct dquot *dquot_alloc(struct super_block *sb, int type) 800884d179dSJan Kara { 801884d179dSJan Kara return kmem_cache_zalloc(dquot_cachep, GFP_NOFS); 802884d179dSJan Kara } 803884d179dSJan Kara EXPORT_SYMBOL(dquot_alloc); 804884d179dSJan Kara 805884d179dSJan Kara static struct dquot *get_empty_dquot(struct super_block *sb, int type) 806884d179dSJan Kara { 807884d179dSJan Kara struct dquot *dquot; 808884d179dSJan Kara 809884d179dSJan Kara dquot = sb->dq_op->alloc_dquot(sb, type); 810884d179dSJan Kara if(!dquot) 811dd6f3c6dSJan Kara return NULL; 812884d179dSJan Kara 813884d179dSJan Kara mutex_init(&dquot->dq_lock); 814884d179dSJan Kara INIT_LIST_HEAD(&dquot->dq_free); 815884d179dSJan Kara INIT_LIST_HEAD(&dquot->dq_inuse); 816884d179dSJan Kara INIT_HLIST_NODE(&dquot->dq_hash); 817884d179dSJan Kara INIT_LIST_HEAD(&dquot->dq_dirty); 818884d179dSJan Kara init_waitqueue_head(&dquot->dq_wait_unused); 819884d179dSJan Kara dquot->dq_sb = sb; 8201a06d420SEric W. Biederman dquot->dq_id = make_kqid_invalid(type); 821884d179dSJan Kara atomic_set(&dquot->dq_count, 1); 822884d179dSJan Kara 823884d179dSJan Kara return dquot; 824884d179dSJan Kara } 825884d179dSJan Kara 826884d179dSJan Kara /* 827884d179dSJan Kara * Get reference to dquot 828884d179dSJan Kara * 829884d179dSJan Kara * Locking is slightly tricky here. We are guarded from parallel quotaoff() 830884d179dSJan Kara * destroying our dquot by: 831884d179dSJan Kara * a) checking for quota flags under dq_list_lock and 832884d179dSJan Kara * b) getting a reference to dquot before we release dq_list_lock 833884d179dSJan Kara */ 834aca645a6SEric W. Biederman struct dquot *dqget(struct super_block *sb, struct kqid qid) 835884d179dSJan Kara { 8361a06d420SEric W. Biederman unsigned int hashent = hashfn(sb, qid); 837dd6f3c6dSJan Kara struct dquot *dquot = NULL, *empty = NULL; 838884d179dSJan Kara 8391a06d420SEric W. Biederman if (!sb_has_quota_active(sb, qid.type)) 840dd6f3c6dSJan Kara return NULL; 841884d179dSJan Kara we_slept: 842884d179dSJan Kara spin_lock(&dq_list_lock); 843884d179dSJan Kara spin_lock(&dq_state_lock); 8441a06d420SEric W. Biederman if (!sb_has_quota_active(sb, qid.type)) { 845884d179dSJan Kara spin_unlock(&dq_state_lock); 846884d179dSJan Kara spin_unlock(&dq_list_lock); 847884d179dSJan Kara goto out; 848884d179dSJan Kara } 849884d179dSJan Kara spin_unlock(&dq_state_lock); 850884d179dSJan Kara 8511a06d420SEric W. Biederman dquot = find_dquot(hashent, sb, qid); 852dd6f3c6dSJan Kara if (!dquot) { 853dd6f3c6dSJan Kara if (!empty) { 854884d179dSJan Kara spin_unlock(&dq_list_lock); 8551a06d420SEric W. Biederman empty = get_empty_dquot(sb, qid.type); 856dd6f3c6dSJan Kara if (!empty) 857884d179dSJan Kara schedule(); /* Try to wait for a moment... */ 858884d179dSJan Kara goto we_slept; 859884d179dSJan Kara } 860884d179dSJan Kara dquot = empty; 861dd6f3c6dSJan Kara empty = NULL; 8624c376dcaSEric W. Biederman dquot->dq_id = qid; 863884d179dSJan Kara /* all dquots go on the inuse_list */ 864884d179dSJan Kara put_inuse(dquot); 865884d179dSJan Kara /* hash it first so it can be found */ 866884d179dSJan Kara insert_dquot_hash(dquot); 867884d179dSJan Kara spin_unlock(&dq_list_lock); 868dde95888SDmitry Monakhov dqstats_inc(DQST_LOOKUPS); 869884d179dSJan Kara } else { 870884d179dSJan Kara if (!atomic_read(&dquot->dq_count)) 871884d179dSJan Kara remove_free_dquot(dquot); 872884d179dSJan Kara atomic_inc(&dquot->dq_count); 873884d179dSJan Kara spin_unlock(&dq_list_lock); 874dde95888SDmitry Monakhov dqstats_inc(DQST_CACHE_HITS); 875dde95888SDmitry Monakhov dqstats_inc(DQST_LOOKUPS); 876884d179dSJan Kara } 877268157baSJan Kara /* Wait for dq_lock - after this we know that either dquot_release() is 878268157baSJan Kara * already finished or it will be canceled due to dq_count > 1 test */ 879884d179dSJan Kara wait_on_dquot(dquot); 880268157baSJan Kara /* Read the dquot / allocate space in quota file */ 881268157baSJan Kara if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && 882268157baSJan Kara sb->dq_op->acquire_dquot(dquot) < 0) { 883884d179dSJan Kara dqput(dquot); 884dd6f3c6dSJan Kara dquot = NULL; 885884d179dSJan Kara goto out; 886884d179dSJan Kara } 88762af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 888884d179dSJan Kara BUG_ON(!dquot->dq_sb); /* Has somebody invalidated entry under us? */ 889884d179dSJan Kara #endif 890884d179dSJan Kara out: 891884d179dSJan Kara if (empty) 892884d179dSJan Kara do_destroy_dquot(empty); 893884d179dSJan Kara 894884d179dSJan Kara return dquot; 895884d179dSJan Kara } 896884d179dSJan Kara EXPORT_SYMBOL(dqget); 897884d179dSJan Kara 898884d179dSJan Kara static int dqinit_needed(struct inode *inode, int type) 899884d179dSJan Kara { 900884d179dSJan Kara int cnt; 901884d179dSJan Kara 902884d179dSJan Kara if (IS_NOQUOTA(inode)) 903884d179dSJan Kara return 0; 904884d179dSJan Kara if (type != -1) 905dd6f3c6dSJan Kara return !inode->i_dquot[type]; 906884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 907dd6f3c6dSJan Kara if (!inode->i_dquot[cnt]) 908884d179dSJan Kara return 1; 909884d179dSJan Kara return 0; 910884d179dSJan Kara } 911884d179dSJan Kara 912884d179dSJan Kara /* This routine is guarded by dqonoff_mutex mutex */ 913884d179dSJan Kara static void add_dquot_ref(struct super_block *sb, int type) 914884d179dSJan Kara { 915884d179dSJan Kara struct inode *inode, *old_inode = NULL; 91662af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 9170a5a9c72SJan Kara int reserved = 0; 9184c5e6c0eSJan Kara #endif 919884d179dSJan Kara 92055fa6091SDave Chinner spin_lock(&inode_sb_list_lock); 921884d179dSJan Kara list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { 922250df6edSDave Chinner spin_lock(&inode->i_lock); 923250df6edSDave Chinner if ((inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW)) || 924250df6edSDave Chinner !atomic_read(&inode->i_writecount) || 925250df6edSDave Chinner !dqinit_needed(inode, type)) { 926250df6edSDave Chinner spin_unlock(&inode->i_lock); 9273ae5080fSLinus Torvalds continue; 928250df6edSDave Chinner } 929884d179dSJan Kara __iget(inode); 930250df6edSDave Chinner spin_unlock(&inode->i_lock); 93155fa6091SDave Chinner spin_unlock(&inode_sb_list_lock); 932884d179dSJan Kara 933d7e97117SJan Kara #ifdef CONFIG_QUOTA_DEBUG 934d7e97117SJan Kara if (unlikely(inode_get_rsv_space(inode) > 0)) 935d7e97117SJan Kara reserved = 1; 936d7e97117SJan Kara #endif 937884d179dSJan Kara iput(old_inode); 938871a2931SChristoph Hellwig __dquot_initialize(inode, type); 93955fa6091SDave Chinner 94055fa6091SDave Chinner /* 94155fa6091SDave Chinner * We hold a reference to 'inode' so it couldn't have been 94255fa6091SDave Chinner * removed from s_inodes list while we dropped the 94355fa6091SDave Chinner * inode_sb_list_lock We cannot iput the inode now as we can be 94455fa6091SDave Chinner * holding the last reference and we cannot iput it under 94555fa6091SDave Chinner * inode_sb_list_lock. So we keep the reference and iput it 94655fa6091SDave Chinner * later. 94755fa6091SDave Chinner */ 948884d179dSJan Kara old_inode = inode; 94955fa6091SDave Chinner spin_lock(&inode_sb_list_lock); 950884d179dSJan Kara } 95155fa6091SDave Chinner spin_unlock(&inode_sb_list_lock); 952884d179dSJan Kara iput(old_inode); 9530a5a9c72SJan Kara 95462af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 9550a5a9c72SJan Kara if (reserved) { 956fb5ffb0eSJiaying Zhang quota_error(sb, "Writes happened before quota was turned on " 957fb5ffb0eSJiaying Zhang "thus quota information is probably inconsistent. " 958fb5ffb0eSJiaying Zhang "Please run quotacheck(8)"); 9590a5a9c72SJan Kara } 9604c5e6c0eSJan Kara #endif 961884d179dSJan Kara } 962884d179dSJan Kara 963268157baSJan Kara /* 964268157baSJan Kara * Return 0 if dqput() won't block. 965268157baSJan Kara * (note that 1 doesn't necessarily mean blocking) 966268157baSJan Kara */ 967884d179dSJan Kara static inline int dqput_blocks(struct dquot *dquot) 968884d179dSJan Kara { 969884d179dSJan Kara if (atomic_read(&dquot->dq_count) <= 1) 970884d179dSJan Kara return 1; 971884d179dSJan Kara return 0; 972884d179dSJan Kara } 973884d179dSJan Kara 974268157baSJan Kara /* 975268157baSJan Kara * Remove references to dquots from inode and add dquot to list for freeing 97625985edcSLucas De Marchi * if we have the last reference to dquot 977268157baSJan Kara * We can't race with anybody because we hold dqptr_sem for writing... 978268157baSJan Kara */ 979884d179dSJan Kara static int remove_inode_dquot_ref(struct inode *inode, int type, 980884d179dSJan Kara struct list_head *tofree_head) 981884d179dSJan Kara { 982884d179dSJan Kara struct dquot *dquot = inode->i_dquot[type]; 983884d179dSJan Kara 984dd6f3c6dSJan Kara inode->i_dquot[type] = NULL; 985dd6f3c6dSJan Kara if (dquot) { 986884d179dSJan Kara if (dqput_blocks(dquot)) { 98762af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 988884d179dSJan Kara if (atomic_read(&dquot->dq_count) != 1) 989fb5ffb0eSJiaying Zhang quota_error(inode->i_sb, "Adding dquot with " 990fb5ffb0eSJiaying Zhang "dq_count %d to dispose list", 991fb5ffb0eSJiaying Zhang atomic_read(&dquot->dq_count)); 992884d179dSJan Kara #endif 993884d179dSJan Kara spin_lock(&dq_list_lock); 994268157baSJan Kara /* As dquot must have currently users it can't be on 995268157baSJan Kara * the free list... */ 996268157baSJan Kara list_add(&dquot->dq_free, tofree_head); 997884d179dSJan Kara spin_unlock(&dq_list_lock); 998884d179dSJan Kara return 1; 999884d179dSJan Kara } 1000884d179dSJan Kara else 1001884d179dSJan Kara dqput(dquot); /* We have guaranteed we won't block */ 1002884d179dSJan Kara } 1003884d179dSJan Kara return 0; 1004884d179dSJan Kara } 1005884d179dSJan Kara 1006268157baSJan Kara /* 1007268157baSJan Kara * Free list of dquots 1008268157baSJan Kara * Dquots are removed from inodes and no new references can be got so we are 1009268157baSJan Kara * the only ones holding reference 1010268157baSJan Kara */ 1011884d179dSJan Kara static void put_dquot_list(struct list_head *tofree_head) 1012884d179dSJan Kara { 1013884d179dSJan Kara struct list_head *act_head; 1014884d179dSJan Kara struct dquot *dquot; 1015884d179dSJan Kara 1016884d179dSJan Kara act_head = tofree_head->next; 1017884d179dSJan Kara while (act_head != tofree_head) { 1018884d179dSJan Kara dquot = list_entry(act_head, struct dquot, dq_free); 1019884d179dSJan Kara act_head = act_head->next; 1020268157baSJan Kara /* Remove dquot from the list so we won't have problems... */ 1021268157baSJan Kara list_del_init(&dquot->dq_free); 1022884d179dSJan Kara dqput(dquot); 1023884d179dSJan Kara } 1024884d179dSJan Kara } 1025884d179dSJan Kara 1026884d179dSJan Kara static void remove_dquot_ref(struct super_block *sb, int type, 1027884d179dSJan Kara struct list_head *tofree_head) 1028884d179dSJan Kara { 1029884d179dSJan Kara struct inode *inode; 10307af9cce8SDmitry Monakhov int reserved = 0; 1031884d179dSJan Kara 103255fa6091SDave Chinner spin_lock(&inode_sb_list_lock); 1033884d179dSJan Kara list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { 10343ae5080fSLinus Torvalds /* 10353ae5080fSLinus Torvalds * We have to scan also I_NEW inodes because they can already 10363ae5080fSLinus Torvalds * have quota pointer initialized. Luckily, we need to touch 10373ae5080fSLinus Torvalds * only quota pointers and these have separate locking 10383ae5080fSLinus Torvalds * (dqptr_sem). 10393ae5080fSLinus Torvalds */ 10407af9cce8SDmitry Monakhov if (!IS_NOQUOTA(inode)) { 10417af9cce8SDmitry Monakhov if (unlikely(inode_get_rsv_space(inode) > 0)) 10427af9cce8SDmitry Monakhov reserved = 1; 1043884d179dSJan Kara remove_inode_dquot_ref(inode, type, tofree_head); 1044884d179dSJan Kara } 10457af9cce8SDmitry Monakhov } 104655fa6091SDave Chinner spin_unlock(&inode_sb_list_lock); 10477af9cce8SDmitry Monakhov #ifdef CONFIG_QUOTA_DEBUG 10487af9cce8SDmitry Monakhov if (reserved) { 10497af9cce8SDmitry Monakhov printk(KERN_WARNING "VFS (%s): Writes happened after quota" 10507af9cce8SDmitry Monakhov " was disabled thus quota information is probably " 10517af9cce8SDmitry Monakhov "inconsistent. Please run quotacheck(8).\n", sb->s_id); 10527af9cce8SDmitry Monakhov } 10537af9cce8SDmitry Monakhov #endif 1054884d179dSJan Kara } 1055884d179dSJan Kara 1056884d179dSJan Kara /* Gather all references from inodes and drop them */ 1057884d179dSJan Kara static void drop_dquot_ref(struct super_block *sb, int type) 1058884d179dSJan Kara { 1059884d179dSJan Kara LIST_HEAD(tofree_head); 1060884d179dSJan Kara 1061884d179dSJan Kara if (sb->dq_op) { 1062884d179dSJan Kara down_write(&sb_dqopt(sb)->dqptr_sem); 1063884d179dSJan Kara remove_dquot_ref(sb, type, &tofree_head); 1064884d179dSJan Kara up_write(&sb_dqopt(sb)->dqptr_sem); 1065884d179dSJan Kara put_dquot_list(&tofree_head); 1066884d179dSJan Kara } 1067884d179dSJan Kara } 1068884d179dSJan Kara 1069884d179dSJan Kara static inline void dquot_incr_inodes(struct dquot *dquot, qsize_t number) 1070884d179dSJan Kara { 1071884d179dSJan Kara dquot->dq_dqb.dqb_curinodes += number; 1072884d179dSJan Kara } 1073884d179dSJan Kara 1074884d179dSJan Kara static inline void dquot_incr_space(struct dquot *dquot, qsize_t number) 1075884d179dSJan Kara { 1076884d179dSJan Kara dquot->dq_dqb.dqb_curspace += number; 1077884d179dSJan Kara } 1078884d179dSJan Kara 1079884d179dSJan Kara static inline void dquot_resv_space(struct dquot *dquot, qsize_t number) 1080884d179dSJan Kara { 1081884d179dSJan Kara dquot->dq_dqb.dqb_rsvspace += number; 1082884d179dSJan Kara } 1083884d179dSJan Kara 1084884d179dSJan Kara /* 1085884d179dSJan Kara * Claim reserved quota space 1086884d179dSJan Kara */ 10870a5a9c72SJan Kara static void dquot_claim_reserved_space(struct dquot *dquot, qsize_t number) 1088884d179dSJan Kara { 10890a5a9c72SJan Kara if (dquot->dq_dqb.dqb_rsvspace < number) { 10900a5a9c72SJan Kara WARN_ON_ONCE(1); 10910a5a9c72SJan Kara number = dquot->dq_dqb.dqb_rsvspace; 10920a5a9c72SJan Kara } 1093884d179dSJan Kara dquot->dq_dqb.dqb_curspace += number; 1094884d179dSJan Kara dquot->dq_dqb.dqb_rsvspace -= number; 1095884d179dSJan Kara } 1096884d179dSJan Kara 1097884d179dSJan Kara static inline 1098884d179dSJan Kara void dquot_free_reserved_space(struct dquot *dquot, qsize_t number) 1099884d179dSJan Kara { 11000a5a9c72SJan Kara if (dquot->dq_dqb.dqb_rsvspace >= number) 1101884d179dSJan Kara dquot->dq_dqb.dqb_rsvspace -= number; 11020a5a9c72SJan Kara else { 11030a5a9c72SJan Kara WARN_ON_ONCE(1); 11040a5a9c72SJan Kara dquot->dq_dqb.dqb_rsvspace = 0; 11050a5a9c72SJan Kara } 1106884d179dSJan Kara } 1107884d179dSJan Kara 11087a2435d8SJan Kara static void dquot_decr_inodes(struct dquot *dquot, qsize_t number) 1109884d179dSJan Kara { 1110884d179dSJan Kara if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE || 1111884d179dSJan Kara dquot->dq_dqb.dqb_curinodes >= number) 1112884d179dSJan Kara dquot->dq_dqb.dqb_curinodes -= number; 1113884d179dSJan Kara else 1114884d179dSJan Kara dquot->dq_dqb.dqb_curinodes = 0; 1115884d179dSJan Kara if (dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit) 1116884d179dSJan Kara dquot->dq_dqb.dqb_itime = (time_t) 0; 1117884d179dSJan Kara clear_bit(DQ_INODES_B, &dquot->dq_flags); 1118884d179dSJan Kara } 1119884d179dSJan Kara 11207a2435d8SJan Kara static void dquot_decr_space(struct dquot *dquot, qsize_t number) 1121884d179dSJan Kara { 1122884d179dSJan Kara if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE || 1123884d179dSJan Kara dquot->dq_dqb.dqb_curspace >= number) 1124884d179dSJan Kara dquot->dq_dqb.dqb_curspace -= number; 1125884d179dSJan Kara else 1126884d179dSJan Kara dquot->dq_dqb.dqb_curspace = 0; 1127884d179dSJan Kara if (dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit) 1128884d179dSJan Kara dquot->dq_dqb.dqb_btime = (time_t) 0; 1129884d179dSJan Kara clear_bit(DQ_BLKS_B, &dquot->dq_flags); 1130884d179dSJan Kara } 1131884d179dSJan Kara 1132bf097aafSJan Kara struct dquot_warn { 1133bf097aafSJan Kara struct super_block *w_sb; 11347b9c7321SEric W. Biederman struct kqid w_dq_id; 1135bf097aafSJan Kara short w_type; 1136bf097aafSJan Kara }; 1137bf097aafSJan Kara 1138884d179dSJan Kara static int warning_issued(struct dquot *dquot, const int warntype) 1139884d179dSJan Kara { 1140884d179dSJan Kara int flag = (warntype == QUOTA_NL_BHARDWARN || 1141884d179dSJan Kara warntype == QUOTA_NL_BSOFTLONGWARN) ? DQ_BLKS_B : 1142884d179dSJan Kara ((warntype == QUOTA_NL_IHARDWARN || 1143884d179dSJan Kara warntype == QUOTA_NL_ISOFTLONGWARN) ? DQ_INODES_B : 0); 1144884d179dSJan Kara 1145884d179dSJan Kara if (!flag) 1146884d179dSJan Kara return 0; 1147884d179dSJan Kara return test_and_set_bit(flag, &dquot->dq_flags); 1148884d179dSJan Kara } 1149884d179dSJan Kara 1150884d179dSJan Kara #ifdef CONFIG_PRINT_QUOTA_WARNING 1151884d179dSJan Kara static int flag_print_warnings = 1; 1152884d179dSJan Kara 1153bf097aafSJan Kara static int need_print_warning(struct dquot_warn *warn) 1154884d179dSJan Kara { 1155884d179dSJan Kara if (!flag_print_warnings) 1156884d179dSJan Kara return 0; 1157884d179dSJan Kara 11587b9c7321SEric W. Biederman switch (warn->w_dq_id.type) { 1159884d179dSJan Kara case USRQUOTA: 11601a06d420SEric W. Biederman return uid_eq(current_fsuid(), warn->w_dq_id.uid); 1161884d179dSJan Kara case GRPQUOTA: 11627b9c7321SEric W. Biederman return in_group_p(warn->w_dq_id.gid); 1163*6c29c50fSJan Kara case PRJQUOTA: /* Never taken... Just make gcc happy */ 1164*6c29c50fSJan Kara return 0; 1165884d179dSJan Kara } 1166884d179dSJan Kara return 0; 1167884d179dSJan Kara } 1168884d179dSJan Kara 1169884d179dSJan Kara /* Print warning to user which exceeded quota */ 1170bf097aafSJan Kara static void print_warning(struct dquot_warn *warn) 1171884d179dSJan Kara { 1172884d179dSJan Kara char *msg = NULL; 1173884d179dSJan Kara struct tty_struct *tty; 1174bf097aafSJan Kara int warntype = warn->w_type; 1175884d179dSJan Kara 1176884d179dSJan Kara if (warntype == QUOTA_NL_IHARDBELOW || 1177884d179dSJan Kara warntype == QUOTA_NL_ISOFTBELOW || 1178884d179dSJan Kara warntype == QUOTA_NL_BHARDBELOW || 1179bf097aafSJan Kara warntype == QUOTA_NL_BSOFTBELOW || !need_print_warning(warn)) 1180884d179dSJan Kara return; 1181884d179dSJan Kara 1182884d179dSJan Kara tty = get_current_tty(); 1183884d179dSJan Kara if (!tty) 1184884d179dSJan Kara return; 1185bf097aafSJan Kara tty_write_message(tty, warn->w_sb->s_id); 1186884d179dSJan Kara if (warntype == QUOTA_NL_ISOFTWARN || warntype == QUOTA_NL_BSOFTWARN) 1187884d179dSJan Kara tty_write_message(tty, ": warning, "); 1188884d179dSJan Kara else 1189884d179dSJan Kara tty_write_message(tty, ": write failed, "); 11907b9c7321SEric W. Biederman tty_write_message(tty, quotatypes[warn->w_dq_id.type]); 1191884d179dSJan Kara switch (warntype) { 1192884d179dSJan Kara case QUOTA_NL_IHARDWARN: 1193884d179dSJan Kara msg = " file limit reached.\r\n"; 1194884d179dSJan Kara break; 1195884d179dSJan Kara case QUOTA_NL_ISOFTLONGWARN: 1196884d179dSJan Kara msg = " file quota exceeded too long.\r\n"; 1197884d179dSJan Kara break; 1198884d179dSJan Kara case QUOTA_NL_ISOFTWARN: 1199884d179dSJan Kara msg = " file quota exceeded.\r\n"; 1200884d179dSJan Kara break; 1201884d179dSJan Kara case QUOTA_NL_BHARDWARN: 1202884d179dSJan Kara msg = " block limit reached.\r\n"; 1203884d179dSJan Kara break; 1204884d179dSJan Kara case QUOTA_NL_BSOFTLONGWARN: 1205884d179dSJan Kara msg = " block quota exceeded too long.\r\n"; 1206884d179dSJan Kara break; 1207884d179dSJan Kara case QUOTA_NL_BSOFTWARN: 1208884d179dSJan Kara msg = " block quota exceeded.\r\n"; 1209884d179dSJan Kara break; 1210884d179dSJan Kara } 1211884d179dSJan Kara tty_write_message(tty, msg); 1212884d179dSJan Kara tty_kref_put(tty); 1213884d179dSJan Kara } 1214884d179dSJan Kara #endif 1215884d179dSJan Kara 1216bf097aafSJan Kara static void prepare_warning(struct dquot_warn *warn, struct dquot *dquot, 1217bf097aafSJan Kara int warntype) 1218bf097aafSJan Kara { 1219bf097aafSJan Kara if (warning_issued(dquot, warntype)) 1220bf097aafSJan Kara return; 1221bf097aafSJan Kara warn->w_type = warntype; 1222bf097aafSJan Kara warn->w_sb = dquot->dq_sb; 1223bf097aafSJan Kara warn->w_dq_id = dquot->dq_id; 1224bf097aafSJan Kara } 1225bf097aafSJan Kara 1226884d179dSJan Kara /* 1227884d179dSJan Kara * Write warnings to the console and send warning messages over netlink. 1228884d179dSJan Kara * 1229bf097aafSJan Kara * Note that this function can call into tty and networking code. 1230884d179dSJan Kara */ 1231bf097aafSJan Kara static void flush_warnings(struct dquot_warn *warn) 1232884d179dSJan Kara { 1233884d179dSJan Kara int i; 1234884d179dSJan Kara 123586e931a3SSteven Whitehouse for (i = 0; i < MAXQUOTAS; i++) { 1236bf097aafSJan Kara if (warn[i].w_type == QUOTA_NL_NOWARN) 1237bf097aafSJan Kara continue; 1238884d179dSJan Kara #ifdef CONFIG_PRINT_QUOTA_WARNING 1239bf097aafSJan Kara print_warning(&warn[i]); 1240884d179dSJan Kara #endif 12417b9c7321SEric W. Biederman quota_send_warning(warn[i].w_dq_id, 1242bf097aafSJan Kara warn[i].w_sb->s_dev, warn[i].w_type); 1243884d179dSJan Kara } 1244884d179dSJan Kara } 1245884d179dSJan Kara 12467a2435d8SJan Kara static int ignore_hardlimit(struct dquot *dquot) 1247884d179dSJan Kara { 12484c376dcaSEric W. Biederman struct mem_dqinfo *info = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_id.type]; 1249884d179dSJan Kara 1250884d179dSJan Kara return capable(CAP_SYS_RESOURCE) && 1251268157baSJan Kara (info->dqi_format->qf_fmt_id != QFMT_VFS_OLD || 1252268157baSJan Kara !(info->dqi_flags & V1_DQF_RSQUASH)); 1253884d179dSJan Kara } 1254884d179dSJan Kara 1255884d179dSJan Kara /* needs dq_data_lock */ 1256bf097aafSJan Kara static int check_idq(struct dquot *dquot, qsize_t inodes, 1257bf097aafSJan Kara struct dquot_warn *warn) 1258884d179dSJan Kara { 1259268157baSJan Kara qsize_t newinodes = dquot->dq_dqb.dqb_curinodes + inodes; 1260268157baSJan Kara 12614c376dcaSEric W. Biederman if (!sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_id.type) || 1262884d179dSJan Kara test_bit(DQ_FAKE_B, &dquot->dq_flags)) 1263efd8f0e6SChristoph Hellwig return 0; 1264884d179dSJan Kara 1265884d179dSJan Kara if (dquot->dq_dqb.dqb_ihardlimit && 1266268157baSJan Kara newinodes > dquot->dq_dqb.dqb_ihardlimit && 1267884d179dSJan Kara !ignore_hardlimit(dquot)) { 1268bf097aafSJan Kara prepare_warning(warn, dquot, QUOTA_NL_IHARDWARN); 1269efd8f0e6SChristoph Hellwig return -EDQUOT; 1270884d179dSJan Kara } 1271884d179dSJan Kara 1272884d179dSJan Kara if (dquot->dq_dqb.dqb_isoftlimit && 1273268157baSJan Kara newinodes > dquot->dq_dqb.dqb_isoftlimit && 1274268157baSJan Kara dquot->dq_dqb.dqb_itime && 1275268157baSJan Kara get_seconds() >= dquot->dq_dqb.dqb_itime && 1276884d179dSJan Kara !ignore_hardlimit(dquot)) { 1277bf097aafSJan Kara prepare_warning(warn, dquot, QUOTA_NL_ISOFTLONGWARN); 1278efd8f0e6SChristoph Hellwig return -EDQUOT; 1279884d179dSJan Kara } 1280884d179dSJan Kara 1281884d179dSJan Kara if (dquot->dq_dqb.dqb_isoftlimit && 1282268157baSJan Kara newinodes > dquot->dq_dqb.dqb_isoftlimit && 1283884d179dSJan Kara dquot->dq_dqb.dqb_itime == 0) { 1284bf097aafSJan Kara prepare_warning(warn, dquot, QUOTA_NL_ISOFTWARN); 1285268157baSJan Kara dquot->dq_dqb.dqb_itime = get_seconds() + 12864c376dcaSEric W. Biederman sb_dqopt(dquot->dq_sb)->info[dquot->dq_id.type].dqi_igrace; 1287884d179dSJan Kara } 1288884d179dSJan Kara 1289efd8f0e6SChristoph Hellwig return 0; 1290884d179dSJan Kara } 1291884d179dSJan Kara 1292884d179dSJan Kara /* needs dq_data_lock */ 1293bf097aafSJan Kara static int check_bdq(struct dquot *dquot, qsize_t space, int prealloc, 1294bf097aafSJan Kara struct dquot_warn *warn) 1295884d179dSJan Kara { 1296884d179dSJan Kara qsize_t tspace; 1297268157baSJan Kara struct super_block *sb = dquot->dq_sb; 1298884d179dSJan Kara 12994c376dcaSEric W. Biederman if (!sb_has_quota_limits_enabled(sb, dquot->dq_id.type) || 1300884d179dSJan Kara test_bit(DQ_FAKE_B, &dquot->dq_flags)) 1301efd8f0e6SChristoph Hellwig return 0; 1302884d179dSJan Kara 1303884d179dSJan Kara tspace = dquot->dq_dqb.dqb_curspace + dquot->dq_dqb.dqb_rsvspace 1304884d179dSJan Kara + space; 1305884d179dSJan Kara 1306884d179dSJan Kara if (dquot->dq_dqb.dqb_bhardlimit && 1307884d179dSJan Kara tspace > dquot->dq_dqb.dqb_bhardlimit && 1308884d179dSJan Kara !ignore_hardlimit(dquot)) { 1309884d179dSJan Kara if (!prealloc) 1310bf097aafSJan Kara prepare_warning(warn, dquot, QUOTA_NL_BHARDWARN); 1311efd8f0e6SChristoph Hellwig return -EDQUOT; 1312884d179dSJan Kara } 1313884d179dSJan Kara 1314884d179dSJan Kara if (dquot->dq_dqb.dqb_bsoftlimit && 1315884d179dSJan Kara tspace > dquot->dq_dqb.dqb_bsoftlimit && 1316268157baSJan Kara dquot->dq_dqb.dqb_btime && 1317268157baSJan Kara get_seconds() >= dquot->dq_dqb.dqb_btime && 1318884d179dSJan Kara !ignore_hardlimit(dquot)) { 1319884d179dSJan Kara if (!prealloc) 1320bf097aafSJan Kara prepare_warning(warn, dquot, QUOTA_NL_BSOFTLONGWARN); 1321efd8f0e6SChristoph Hellwig return -EDQUOT; 1322884d179dSJan Kara } 1323884d179dSJan Kara 1324884d179dSJan Kara if (dquot->dq_dqb.dqb_bsoftlimit && 1325884d179dSJan Kara tspace > dquot->dq_dqb.dqb_bsoftlimit && 1326884d179dSJan Kara dquot->dq_dqb.dqb_btime == 0) { 1327884d179dSJan Kara if (!prealloc) { 1328bf097aafSJan Kara prepare_warning(warn, dquot, QUOTA_NL_BSOFTWARN); 1329268157baSJan Kara dquot->dq_dqb.dqb_btime = get_seconds() + 13304c376dcaSEric W. Biederman sb_dqopt(sb)->info[dquot->dq_id.type].dqi_bgrace; 1331884d179dSJan Kara } 1332884d179dSJan Kara else 1333884d179dSJan Kara /* 1334884d179dSJan Kara * We don't allow preallocation to exceed softlimit so exceeding will 1335884d179dSJan Kara * be always printed 1336884d179dSJan Kara */ 1337efd8f0e6SChristoph Hellwig return -EDQUOT; 1338884d179dSJan Kara } 1339884d179dSJan Kara 1340efd8f0e6SChristoph Hellwig return 0; 1341884d179dSJan Kara } 1342884d179dSJan Kara 1343884d179dSJan Kara static int info_idq_free(struct dquot *dquot, qsize_t inodes) 1344884d179dSJan Kara { 1345268157baSJan Kara qsize_t newinodes; 1346268157baSJan Kara 1347884d179dSJan Kara if (test_bit(DQ_FAKE_B, &dquot->dq_flags) || 1348884d179dSJan Kara dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit || 13494c376dcaSEric W. Biederman !sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_id.type)) 1350884d179dSJan Kara return QUOTA_NL_NOWARN; 1351884d179dSJan Kara 1352268157baSJan Kara newinodes = dquot->dq_dqb.dqb_curinodes - inodes; 1353268157baSJan Kara if (newinodes <= dquot->dq_dqb.dqb_isoftlimit) 1354884d179dSJan Kara return QUOTA_NL_ISOFTBELOW; 1355884d179dSJan Kara if (dquot->dq_dqb.dqb_curinodes >= dquot->dq_dqb.dqb_ihardlimit && 1356268157baSJan Kara newinodes < dquot->dq_dqb.dqb_ihardlimit) 1357884d179dSJan Kara return QUOTA_NL_IHARDBELOW; 1358884d179dSJan Kara return QUOTA_NL_NOWARN; 1359884d179dSJan Kara } 1360884d179dSJan Kara 1361884d179dSJan Kara static int info_bdq_free(struct dquot *dquot, qsize_t space) 1362884d179dSJan Kara { 1363884d179dSJan Kara if (test_bit(DQ_FAKE_B, &dquot->dq_flags) || 1364884d179dSJan Kara dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit) 1365884d179dSJan Kara return QUOTA_NL_NOWARN; 1366884d179dSJan Kara 1367884d179dSJan Kara if (dquot->dq_dqb.dqb_curspace - space <= dquot->dq_dqb.dqb_bsoftlimit) 1368884d179dSJan Kara return QUOTA_NL_BSOFTBELOW; 1369884d179dSJan Kara if (dquot->dq_dqb.dqb_curspace >= dquot->dq_dqb.dqb_bhardlimit && 1370884d179dSJan Kara dquot->dq_dqb.dqb_curspace - space < dquot->dq_dqb.dqb_bhardlimit) 1371884d179dSJan Kara return QUOTA_NL_BHARDBELOW; 1372884d179dSJan Kara return QUOTA_NL_NOWARN; 1373884d179dSJan Kara } 13740a5a9c72SJan Kara 1375189eef59SChristoph Hellwig static int dquot_active(const struct inode *inode) 1376189eef59SChristoph Hellwig { 1377189eef59SChristoph Hellwig struct super_block *sb = inode->i_sb; 1378189eef59SChristoph Hellwig 1379189eef59SChristoph Hellwig if (IS_NOQUOTA(inode)) 1380189eef59SChristoph Hellwig return 0; 1381189eef59SChristoph Hellwig return sb_any_quota_loaded(sb) & ~sb_any_quota_suspended(sb); 1382189eef59SChristoph Hellwig } 1383189eef59SChristoph Hellwig 1384884d179dSJan Kara /* 1385884d179dSJan Kara * Initialize quota pointers in inode 1386871a2931SChristoph Hellwig * 1387884d179dSJan Kara * We do things in a bit complicated way but by that we avoid calling 1388884d179dSJan Kara * dqget() and thus filesystem callbacks under dqptr_sem. 1389871a2931SChristoph Hellwig * 1390871a2931SChristoph Hellwig * It is better to call this function outside of any transaction as it 1391871a2931SChristoph Hellwig * might need a lot of space in journal for dquot structure allocation. 1392884d179dSJan Kara */ 1393871a2931SChristoph Hellwig static void __dquot_initialize(struct inode *inode, int type) 1394884d179dSJan Kara { 1395871a2931SChristoph Hellwig int cnt; 1396ad1e6e8dSDmitry Monakhov struct dquot *got[MAXQUOTAS]; 1397884d179dSJan Kara struct super_block *sb = inode->i_sb; 13980a5a9c72SJan Kara qsize_t rsv; 1399884d179dSJan Kara 1400884d179dSJan Kara /* First test before acquiring mutex - solves deadlocks when we 1401884d179dSJan Kara * re-enter the quota code and are already holding the mutex */ 1402189eef59SChristoph Hellwig if (!dquot_active(inode)) 1403871a2931SChristoph Hellwig return; 1404884d179dSJan Kara 1405884d179dSJan Kara /* First get references to structures we might need. */ 1406884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1407aca645a6SEric W. Biederman struct kqid qid; 1408ad1e6e8dSDmitry Monakhov got[cnt] = NULL; 1409884d179dSJan Kara if (type != -1 && cnt != type) 1410884d179dSJan Kara continue; 1411884d179dSJan Kara switch (cnt) { 1412884d179dSJan Kara case USRQUOTA: 1413aca645a6SEric W. Biederman qid = make_kqid_uid(inode->i_uid); 1414884d179dSJan Kara break; 1415884d179dSJan Kara case GRPQUOTA: 1416aca645a6SEric W. Biederman qid = make_kqid_gid(inode->i_gid); 1417884d179dSJan Kara break; 1418884d179dSJan Kara } 1419aca645a6SEric W. Biederman got[cnt] = dqget(sb, qid); 1420884d179dSJan Kara } 1421884d179dSJan Kara 1422884d179dSJan Kara down_write(&sb_dqopt(sb)->dqptr_sem); 1423884d179dSJan Kara if (IS_NOQUOTA(inode)) 1424884d179dSJan Kara goto out_err; 1425884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1426884d179dSJan Kara if (type != -1 && cnt != type) 1427884d179dSJan Kara continue; 1428884d179dSJan Kara /* Avoid races with quotaoff() */ 1429884d179dSJan Kara if (!sb_has_quota_active(sb, cnt)) 1430884d179dSJan Kara continue; 14314408ea41SJan Kara /* We could race with quotaon or dqget() could have failed */ 14324408ea41SJan Kara if (!got[cnt]) 14334408ea41SJan Kara continue; 1434dd6f3c6dSJan Kara if (!inode->i_dquot[cnt]) { 1435884d179dSJan Kara inode->i_dquot[cnt] = got[cnt]; 1436dd6f3c6dSJan Kara got[cnt] = NULL; 14370a5a9c72SJan Kara /* 14380a5a9c72SJan Kara * Make quota reservation system happy if someone 14390a5a9c72SJan Kara * did a write before quota was turned on 14400a5a9c72SJan Kara */ 14410a5a9c72SJan Kara rsv = inode_get_rsv_space(inode); 14420a5a9c72SJan Kara if (unlikely(rsv)) 14430a5a9c72SJan Kara dquot_resv_space(inode->i_dquot[cnt], rsv); 1444884d179dSJan Kara } 1445884d179dSJan Kara } 1446884d179dSJan Kara out_err: 1447884d179dSJan Kara up_write(&sb_dqopt(sb)->dqptr_sem); 1448884d179dSJan Kara /* Drop unused references */ 1449dc52dd3aSDmitry Monakhov dqput_all(got); 1450871a2931SChristoph Hellwig } 1451871a2931SChristoph Hellwig 1452871a2931SChristoph Hellwig void dquot_initialize(struct inode *inode) 1453871a2931SChristoph Hellwig { 1454871a2931SChristoph Hellwig __dquot_initialize(inode, -1); 1455884d179dSJan Kara } 1456884d179dSJan Kara EXPORT_SYMBOL(dquot_initialize); 1457884d179dSJan Kara 1458884d179dSJan Kara /* 1459884d179dSJan Kara * Release all quotas referenced by inode 1460884d179dSJan Kara */ 14619f754758SChristoph Hellwig static void __dquot_drop(struct inode *inode) 1462884d179dSJan Kara { 1463884d179dSJan Kara int cnt; 1464884d179dSJan Kara struct dquot *put[MAXQUOTAS]; 1465884d179dSJan Kara 1466884d179dSJan Kara down_write(&sb_dqopt(inode->i_sb)->dqptr_sem); 1467884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1468884d179dSJan Kara put[cnt] = inode->i_dquot[cnt]; 1469dd6f3c6dSJan Kara inode->i_dquot[cnt] = NULL; 1470884d179dSJan Kara } 1471884d179dSJan Kara up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); 1472dc52dd3aSDmitry Monakhov dqput_all(put); 1473884d179dSJan Kara } 1474884d179dSJan Kara 14759f754758SChristoph Hellwig void dquot_drop(struct inode *inode) 1476884d179dSJan Kara { 1477884d179dSJan Kara int cnt; 14789f754758SChristoph Hellwig 14799f754758SChristoph Hellwig if (IS_NOQUOTA(inode)) 14809f754758SChristoph Hellwig return; 14819f754758SChristoph Hellwig 14829f754758SChristoph Hellwig /* 14839f754758SChristoph Hellwig * Test before calling to rule out calls from proc and such 1484884d179dSJan Kara * where we are not allowed to block. Note that this is 1485884d179dSJan Kara * actually reliable test even without the lock - the caller 1486884d179dSJan Kara * must assure that nobody can come after the DQUOT_DROP and 14879f754758SChristoph Hellwig * add quota pointers back anyway. 14889f754758SChristoph Hellwig */ 14899f754758SChristoph Hellwig for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1490dd6f3c6dSJan Kara if (inode->i_dquot[cnt]) 1491884d179dSJan Kara break; 14929f754758SChristoph Hellwig } 14939f754758SChristoph Hellwig 1494884d179dSJan Kara if (cnt < MAXQUOTAS) 14959f754758SChristoph Hellwig __dquot_drop(inode); 1496884d179dSJan Kara } 14979f754758SChristoph Hellwig EXPORT_SYMBOL(dquot_drop); 1498884d179dSJan Kara 1499884d179dSJan Kara /* 1500fd8fbfc1SDmitry Monakhov * inode_reserved_space is managed internally by quota, and protected by 1501fd8fbfc1SDmitry Monakhov * i_lock similar to i_blocks+i_bytes. 1502fd8fbfc1SDmitry Monakhov */ 1503fd8fbfc1SDmitry Monakhov static qsize_t *inode_reserved_space(struct inode * inode) 1504fd8fbfc1SDmitry Monakhov { 1505fd8fbfc1SDmitry Monakhov /* Filesystem must explicitly define it's own method in order to use 1506fd8fbfc1SDmitry Monakhov * quota reservation interface */ 1507fd8fbfc1SDmitry Monakhov BUG_ON(!inode->i_sb->dq_op->get_reserved_space); 1508fd8fbfc1SDmitry Monakhov return inode->i_sb->dq_op->get_reserved_space(inode); 1509fd8fbfc1SDmitry Monakhov } 1510fd8fbfc1SDmitry Monakhov 1511c469070aSDmitry Monakhov void inode_add_rsv_space(struct inode *inode, qsize_t number) 1512fd8fbfc1SDmitry Monakhov { 1513fd8fbfc1SDmitry Monakhov spin_lock(&inode->i_lock); 1514fd8fbfc1SDmitry Monakhov *inode_reserved_space(inode) += number; 1515fd8fbfc1SDmitry Monakhov spin_unlock(&inode->i_lock); 1516fd8fbfc1SDmitry Monakhov } 1517c469070aSDmitry Monakhov EXPORT_SYMBOL(inode_add_rsv_space); 1518fd8fbfc1SDmitry Monakhov 1519c469070aSDmitry Monakhov void inode_claim_rsv_space(struct inode *inode, qsize_t number) 1520fd8fbfc1SDmitry Monakhov { 1521fd8fbfc1SDmitry Monakhov spin_lock(&inode->i_lock); 1522fd8fbfc1SDmitry Monakhov *inode_reserved_space(inode) -= number; 1523fd8fbfc1SDmitry Monakhov __inode_add_bytes(inode, number); 1524fd8fbfc1SDmitry Monakhov spin_unlock(&inode->i_lock); 1525fd8fbfc1SDmitry Monakhov } 1526c469070aSDmitry Monakhov EXPORT_SYMBOL(inode_claim_rsv_space); 1527fd8fbfc1SDmitry Monakhov 1528c469070aSDmitry Monakhov void inode_sub_rsv_space(struct inode *inode, qsize_t number) 1529fd8fbfc1SDmitry Monakhov { 1530fd8fbfc1SDmitry Monakhov spin_lock(&inode->i_lock); 1531fd8fbfc1SDmitry Monakhov *inode_reserved_space(inode) -= number; 1532fd8fbfc1SDmitry Monakhov spin_unlock(&inode->i_lock); 1533fd8fbfc1SDmitry Monakhov } 1534c469070aSDmitry Monakhov EXPORT_SYMBOL(inode_sub_rsv_space); 1535fd8fbfc1SDmitry Monakhov 1536fd8fbfc1SDmitry Monakhov static qsize_t inode_get_rsv_space(struct inode *inode) 1537fd8fbfc1SDmitry Monakhov { 1538fd8fbfc1SDmitry Monakhov qsize_t ret; 153905b5d898SJan Kara 154005b5d898SJan Kara if (!inode->i_sb->dq_op->get_reserved_space) 154105b5d898SJan Kara return 0; 1542fd8fbfc1SDmitry Monakhov spin_lock(&inode->i_lock); 1543fd8fbfc1SDmitry Monakhov ret = *inode_reserved_space(inode); 1544fd8fbfc1SDmitry Monakhov spin_unlock(&inode->i_lock); 1545fd8fbfc1SDmitry Monakhov return ret; 1546fd8fbfc1SDmitry Monakhov } 1547fd8fbfc1SDmitry Monakhov 1548fd8fbfc1SDmitry Monakhov static void inode_incr_space(struct inode *inode, qsize_t number, 1549fd8fbfc1SDmitry Monakhov int reserve) 1550fd8fbfc1SDmitry Monakhov { 1551fd8fbfc1SDmitry Monakhov if (reserve) 1552fd8fbfc1SDmitry Monakhov inode_add_rsv_space(inode, number); 1553fd8fbfc1SDmitry Monakhov else 1554fd8fbfc1SDmitry Monakhov inode_add_bytes(inode, number); 1555fd8fbfc1SDmitry Monakhov } 1556fd8fbfc1SDmitry Monakhov 1557fd8fbfc1SDmitry Monakhov static void inode_decr_space(struct inode *inode, qsize_t number, int reserve) 1558fd8fbfc1SDmitry Monakhov { 1559fd8fbfc1SDmitry Monakhov if (reserve) 1560fd8fbfc1SDmitry Monakhov inode_sub_rsv_space(inode, number); 1561fd8fbfc1SDmitry Monakhov else 1562fd8fbfc1SDmitry Monakhov inode_sub_bytes(inode, number); 1563fd8fbfc1SDmitry Monakhov } 1564fd8fbfc1SDmitry Monakhov 1565fd8fbfc1SDmitry Monakhov /* 15665dd4056dSChristoph Hellwig * This functions updates i_blocks+i_bytes fields and quota information 15675dd4056dSChristoph Hellwig * (together with appropriate checks). 15685dd4056dSChristoph Hellwig * 15695dd4056dSChristoph Hellwig * NOTE: We absolutely rely on the fact that caller dirties the inode 15705dd4056dSChristoph Hellwig * (usually helpers in quotaops.h care about this) and holds a handle for 15715dd4056dSChristoph Hellwig * the current transaction so that dquot write and inode write go into the 15725dd4056dSChristoph Hellwig * same transaction. 1573884d179dSJan Kara */ 1574884d179dSJan Kara 1575884d179dSJan Kara /* 1576884d179dSJan Kara * This operation can block, but only after everything is updated 1577884d179dSJan Kara */ 157856246f9aSEric Sandeen int __dquot_alloc_space(struct inode *inode, qsize_t number, int flags) 1579884d179dSJan Kara { 15805dd4056dSChristoph Hellwig int cnt, ret = 0; 1581bf097aafSJan Kara struct dquot_warn warn[MAXQUOTAS]; 1582bf097aafSJan Kara struct dquot **dquots = inode->i_dquot; 158356246f9aSEric Sandeen int reserve = flags & DQUOT_SPACE_RESERVE; 1584884d179dSJan Kara 1585fd8fbfc1SDmitry Monakhov /* 1586fd8fbfc1SDmitry Monakhov * First test before acquiring mutex - solves deadlocks when we 1587fd8fbfc1SDmitry Monakhov * re-enter the quota code and are already holding the mutex 1588fd8fbfc1SDmitry Monakhov */ 1589189eef59SChristoph Hellwig if (!dquot_active(inode)) { 1590fd8fbfc1SDmitry Monakhov inode_incr_space(inode, number, reserve); 1591fd8fbfc1SDmitry Monakhov goto out; 1592fd8fbfc1SDmitry Monakhov } 1593fd8fbfc1SDmitry Monakhov 1594884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 1595bf097aafSJan Kara warn[cnt].w_type = QUOTA_NL_NOWARN; 1596884d179dSJan Kara 15976ea2eea1SJeff Liu down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1598884d179dSJan Kara spin_lock(&dq_data_lock); 1599884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1600bf097aafSJan Kara if (!dquots[cnt]) 1601884d179dSJan Kara continue; 1602bf097aafSJan Kara ret = check_bdq(dquots[cnt], number, 1603bf097aafSJan Kara !(flags & DQUOT_SPACE_WARN), &warn[cnt]); 1604bf097aafSJan Kara if (ret && !(flags & DQUOT_SPACE_NOFAIL)) { 1605fd8fbfc1SDmitry Monakhov spin_unlock(&dq_data_lock); 1606fd8fbfc1SDmitry Monakhov goto out_flush_warn; 1607884d179dSJan Kara } 1608884d179dSJan Kara } 1609884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1610bf097aafSJan Kara if (!dquots[cnt]) 1611884d179dSJan Kara continue; 1612884d179dSJan Kara if (reserve) 1613bf097aafSJan Kara dquot_resv_space(dquots[cnt], number); 1614884d179dSJan Kara else 1615bf097aafSJan Kara dquot_incr_space(dquots[cnt], number); 1616884d179dSJan Kara } 1617fd8fbfc1SDmitry Monakhov inode_incr_space(inode, number, reserve); 1618884d179dSJan Kara spin_unlock(&dq_data_lock); 1619fd8fbfc1SDmitry Monakhov 1620fd8fbfc1SDmitry Monakhov if (reserve) 1621fd8fbfc1SDmitry Monakhov goto out_flush_warn; 1622bf097aafSJan Kara mark_all_dquot_dirty(dquots); 1623fd8fbfc1SDmitry Monakhov out_flush_warn: 1624fd8fbfc1SDmitry Monakhov up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1625bf097aafSJan Kara flush_warnings(warn); 1626fd8fbfc1SDmitry Monakhov out: 1627884d179dSJan Kara return ret; 1628884d179dSJan Kara } 16295dd4056dSChristoph Hellwig EXPORT_SYMBOL(__dquot_alloc_space); 1630884d179dSJan Kara 1631884d179dSJan Kara /* 1632884d179dSJan Kara * This operation can block, but only after everything is updated 1633884d179dSJan Kara */ 163463936ddaSChristoph Hellwig int dquot_alloc_inode(const struct inode *inode) 1635884d179dSJan Kara { 1636efd8f0e6SChristoph Hellwig int cnt, ret = 0; 1637bf097aafSJan Kara struct dquot_warn warn[MAXQUOTAS]; 1638bf097aafSJan Kara struct dquot * const *dquots = inode->i_dquot; 1639884d179dSJan Kara 1640884d179dSJan Kara /* First test before acquiring mutex - solves deadlocks when we 1641884d179dSJan Kara * re-enter the quota code and are already holding the mutex */ 1642189eef59SChristoph Hellwig if (!dquot_active(inode)) 164363936ddaSChristoph Hellwig return 0; 1644884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 1645bf097aafSJan Kara warn[cnt].w_type = QUOTA_NL_NOWARN; 1646884d179dSJan Kara down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1647884d179dSJan Kara spin_lock(&dq_data_lock); 1648884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1649bf097aafSJan Kara if (!dquots[cnt]) 1650884d179dSJan Kara continue; 1651bf097aafSJan Kara ret = check_idq(dquots[cnt], 1, &warn[cnt]); 1652efd8f0e6SChristoph Hellwig if (ret) 1653884d179dSJan Kara goto warn_put_all; 1654884d179dSJan Kara } 1655884d179dSJan Kara 1656884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1657bf097aafSJan Kara if (!dquots[cnt]) 1658884d179dSJan Kara continue; 1659bf097aafSJan Kara dquot_incr_inodes(dquots[cnt], 1); 1660884d179dSJan Kara } 1661efd8f0e6SChristoph Hellwig 1662884d179dSJan Kara warn_put_all: 1663884d179dSJan Kara spin_unlock(&dq_data_lock); 166463936ddaSChristoph Hellwig if (ret == 0) 1665bf097aafSJan Kara mark_all_dquot_dirty(dquots); 1666884d179dSJan Kara up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1667bf097aafSJan Kara flush_warnings(warn); 1668884d179dSJan Kara return ret; 1669884d179dSJan Kara } 1670884d179dSJan Kara EXPORT_SYMBOL(dquot_alloc_inode); 1671884d179dSJan Kara 16725dd4056dSChristoph Hellwig /* 16735dd4056dSChristoph Hellwig * Convert in-memory reserved quotas to real consumed quotas 16745dd4056dSChristoph Hellwig */ 16755dd4056dSChristoph Hellwig int dquot_claim_space_nodirty(struct inode *inode, qsize_t number) 1676884d179dSJan Kara { 1677884d179dSJan Kara int cnt; 1678884d179dSJan Kara 1679189eef59SChristoph Hellwig if (!dquot_active(inode)) { 1680fd8fbfc1SDmitry Monakhov inode_claim_rsv_space(inode, number); 16815dd4056dSChristoph Hellwig return 0; 1682884d179dSJan Kara } 1683884d179dSJan Kara 1684884d179dSJan Kara down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1685884d179dSJan Kara spin_lock(&dq_data_lock); 1686884d179dSJan Kara /* Claim reserved quotas to allocated quotas */ 1687884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1688dd6f3c6dSJan Kara if (inode->i_dquot[cnt]) 1689884d179dSJan Kara dquot_claim_reserved_space(inode->i_dquot[cnt], 1690884d179dSJan Kara number); 1691884d179dSJan Kara } 1692884d179dSJan Kara /* Update inode bytes */ 1693fd8fbfc1SDmitry Monakhov inode_claim_rsv_space(inode, number); 1694884d179dSJan Kara spin_unlock(&dq_data_lock); 1695dc52dd3aSDmitry Monakhov mark_all_dquot_dirty(inode->i_dquot); 1696884d179dSJan Kara up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 16975dd4056dSChristoph Hellwig return 0; 1698884d179dSJan Kara } 16995dd4056dSChristoph Hellwig EXPORT_SYMBOL(dquot_claim_space_nodirty); 1700884d179dSJan Kara 1701884d179dSJan Kara /* 1702884d179dSJan Kara * This operation can block, but only after everything is updated 1703884d179dSJan Kara */ 170456246f9aSEric Sandeen void __dquot_free_space(struct inode *inode, qsize_t number, int flags) 1705884d179dSJan Kara { 1706884d179dSJan Kara unsigned int cnt; 1707bf097aafSJan Kara struct dquot_warn warn[MAXQUOTAS]; 1708bf097aafSJan Kara struct dquot **dquots = inode->i_dquot; 170956246f9aSEric Sandeen int reserve = flags & DQUOT_SPACE_RESERVE; 1710884d179dSJan Kara 1711884d179dSJan Kara /* First test before acquiring mutex - solves deadlocks when we 1712884d179dSJan Kara * re-enter the quota code and are already holding the mutex */ 1713189eef59SChristoph Hellwig if (!dquot_active(inode)) { 1714fd8fbfc1SDmitry Monakhov inode_decr_space(inode, number, reserve); 17155dd4056dSChristoph Hellwig return; 1716884d179dSJan Kara } 1717884d179dSJan Kara 1718884d179dSJan Kara down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1719884d179dSJan Kara spin_lock(&dq_data_lock); 1720884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1721bf097aafSJan Kara int wtype; 1722bf097aafSJan Kara 1723bf097aafSJan Kara warn[cnt].w_type = QUOTA_NL_NOWARN; 1724bf097aafSJan Kara if (!dquots[cnt]) 1725884d179dSJan Kara continue; 1726bf097aafSJan Kara wtype = info_bdq_free(dquots[cnt], number); 1727bf097aafSJan Kara if (wtype != QUOTA_NL_NOWARN) 1728bf097aafSJan Kara prepare_warning(&warn[cnt], dquots[cnt], wtype); 1729fd8fbfc1SDmitry Monakhov if (reserve) 1730bf097aafSJan Kara dquot_free_reserved_space(dquots[cnt], number); 1731fd8fbfc1SDmitry Monakhov else 1732bf097aafSJan Kara dquot_decr_space(dquots[cnt], number); 1733884d179dSJan Kara } 1734fd8fbfc1SDmitry Monakhov inode_decr_space(inode, number, reserve); 1735884d179dSJan Kara spin_unlock(&dq_data_lock); 1736fd8fbfc1SDmitry Monakhov 1737fd8fbfc1SDmitry Monakhov if (reserve) 1738fd8fbfc1SDmitry Monakhov goto out_unlock; 1739bf097aafSJan Kara mark_all_dquot_dirty(dquots); 1740fd8fbfc1SDmitry Monakhov out_unlock: 1741884d179dSJan Kara up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1742bf097aafSJan Kara flush_warnings(warn); 1743884d179dSJan Kara } 17445dd4056dSChristoph Hellwig EXPORT_SYMBOL(__dquot_free_space); 1745fd8fbfc1SDmitry Monakhov 1746fd8fbfc1SDmitry Monakhov /* 1747884d179dSJan Kara * This operation can block, but only after everything is updated 1748884d179dSJan Kara */ 174963936ddaSChristoph Hellwig void dquot_free_inode(const struct inode *inode) 1750884d179dSJan Kara { 1751884d179dSJan Kara unsigned int cnt; 1752bf097aafSJan Kara struct dquot_warn warn[MAXQUOTAS]; 1753bf097aafSJan Kara struct dquot * const *dquots = inode->i_dquot; 1754884d179dSJan Kara 1755884d179dSJan Kara /* First test before acquiring mutex - solves deadlocks when we 1756884d179dSJan Kara * re-enter the quota code and are already holding the mutex */ 1757189eef59SChristoph Hellwig if (!dquot_active(inode)) 175863936ddaSChristoph Hellwig return; 1759884d179dSJan Kara 1760884d179dSJan Kara down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1761884d179dSJan Kara spin_lock(&dq_data_lock); 1762884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1763bf097aafSJan Kara int wtype; 1764bf097aafSJan Kara 1765bf097aafSJan Kara warn[cnt].w_type = QUOTA_NL_NOWARN; 1766bf097aafSJan Kara if (!dquots[cnt]) 1767884d179dSJan Kara continue; 1768bf097aafSJan Kara wtype = info_idq_free(dquots[cnt], 1); 1769bf097aafSJan Kara if (wtype != QUOTA_NL_NOWARN) 1770bf097aafSJan Kara prepare_warning(&warn[cnt], dquots[cnt], wtype); 1771bf097aafSJan Kara dquot_decr_inodes(dquots[cnt], 1); 1772884d179dSJan Kara } 1773884d179dSJan Kara spin_unlock(&dq_data_lock); 1774bf097aafSJan Kara mark_all_dquot_dirty(dquots); 1775884d179dSJan Kara up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1776bf097aafSJan Kara flush_warnings(warn); 1777884d179dSJan Kara } 1778884d179dSJan Kara EXPORT_SYMBOL(dquot_free_inode); 1779884d179dSJan Kara 1780884d179dSJan Kara /* 1781884d179dSJan Kara * Transfer the number of inode and blocks from one diskquota to an other. 1782bc8e5f07SJan Kara * On success, dquot references in transfer_to are consumed and references 1783bc8e5f07SJan Kara * to original dquots that need to be released are placed there. On failure, 1784bc8e5f07SJan Kara * references are kept untouched. 1785884d179dSJan Kara * 1786884d179dSJan Kara * This operation can block, but only after everything is updated 1787884d179dSJan Kara * A transaction must be started when entering this function. 1788bc8e5f07SJan Kara * 1789884d179dSJan Kara */ 1790bc8e5f07SJan Kara int __dquot_transfer(struct inode *inode, struct dquot **transfer_to) 1791884d179dSJan Kara { 1792884d179dSJan Kara qsize_t space, cur_space; 1793884d179dSJan Kara qsize_t rsv_space = 0; 1794bc8e5f07SJan Kara struct dquot *transfer_from[MAXQUOTAS] = {}; 1795efd8f0e6SChristoph Hellwig int cnt, ret = 0; 17969e32784bSDmitry char is_valid[MAXQUOTAS] = {}; 1797bf097aafSJan Kara struct dquot_warn warn_to[MAXQUOTAS]; 1798bf097aafSJan Kara struct dquot_warn warn_from_inodes[MAXQUOTAS]; 1799bf097aafSJan Kara struct dquot_warn warn_from_space[MAXQUOTAS]; 1800884d179dSJan Kara 1801884d179dSJan Kara /* First test before acquiring mutex - solves deadlocks when we 1802884d179dSJan Kara * re-enter the quota code and are already holding the mutex */ 1803884d179dSJan Kara if (IS_NOQUOTA(inode)) 1804efd8f0e6SChristoph Hellwig return 0; 1805884d179dSJan Kara /* Initialize the arrays */ 1806bf097aafSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1807bf097aafSJan Kara warn_to[cnt].w_type = QUOTA_NL_NOWARN; 1808bf097aafSJan Kara warn_from_inodes[cnt].w_type = QUOTA_NL_NOWARN; 1809bf097aafSJan Kara warn_from_space[cnt].w_type = QUOTA_NL_NOWARN; 1810bf097aafSJan Kara } 1811884d179dSJan Kara down_write(&sb_dqopt(inode->i_sb)->dqptr_sem); 1812884d179dSJan Kara if (IS_NOQUOTA(inode)) { /* File without quota accounting? */ 1813884d179dSJan Kara up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); 1814bc8e5f07SJan Kara return 0; 1815884d179dSJan Kara } 1816884d179dSJan Kara spin_lock(&dq_data_lock); 1817884d179dSJan Kara cur_space = inode_get_bytes(inode); 1818fd8fbfc1SDmitry Monakhov rsv_space = inode_get_rsv_space(inode); 1819884d179dSJan Kara space = cur_space + rsv_space; 1820884d179dSJan Kara /* Build the transfer_from list and check the limits */ 1821884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 18229e32784bSDmitry /* 18239e32784bSDmitry * Skip changes for same uid or gid or for turned off quota-type. 18249e32784bSDmitry */ 1825dd6f3c6dSJan Kara if (!transfer_to[cnt]) 1826884d179dSJan Kara continue; 18279e32784bSDmitry /* Avoid races with quotaoff() */ 18289e32784bSDmitry if (!sb_has_quota_active(inode->i_sb, cnt)) 18299e32784bSDmitry continue; 18309e32784bSDmitry is_valid[cnt] = 1; 1831884d179dSJan Kara transfer_from[cnt] = inode->i_dquot[cnt]; 1832bf097aafSJan Kara ret = check_idq(transfer_to[cnt], 1, &warn_to[cnt]); 1833efd8f0e6SChristoph Hellwig if (ret) 1834efd8f0e6SChristoph Hellwig goto over_quota; 1835bf097aafSJan Kara ret = check_bdq(transfer_to[cnt], space, 0, &warn_to[cnt]); 1836efd8f0e6SChristoph Hellwig if (ret) 1837884d179dSJan Kara goto over_quota; 1838884d179dSJan Kara } 1839884d179dSJan Kara 1840884d179dSJan Kara /* 1841884d179dSJan Kara * Finally perform the needed transfer from transfer_from to transfer_to 1842884d179dSJan Kara */ 1843884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 18449e32784bSDmitry if (!is_valid[cnt]) 1845884d179dSJan Kara continue; 1846884d179dSJan Kara /* Due to IO error we might not have transfer_from[] structure */ 1847884d179dSJan Kara if (transfer_from[cnt]) { 1848bf097aafSJan Kara int wtype; 1849bf097aafSJan Kara wtype = info_idq_free(transfer_from[cnt], 1); 1850bf097aafSJan Kara if (wtype != QUOTA_NL_NOWARN) 1851bf097aafSJan Kara prepare_warning(&warn_from_inodes[cnt], 1852bf097aafSJan Kara transfer_from[cnt], wtype); 1853bf097aafSJan Kara wtype = info_bdq_free(transfer_from[cnt], space); 1854bf097aafSJan Kara if (wtype != QUOTA_NL_NOWARN) 1855bf097aafSJan Kara prepare_warning(&warn_from_space[cnt], 1856bf097aafSJan Kara transfer_from[cnt], wtype); 1857884d179dSJan Kara dquot_decr_inodes(transfer_from[cnt], 1); 1858884d179dSJan Kara dquot_decr_space(transfer_from[cnt], cur_space); 1859884d179dSJan Kara dquot_free_reserved_space(transfer_from[cnt], 1860884d179dSJan Kara rsv_space); 1861884d179dSJan Kara } 1862884d179dSJan Kara 1863884d179dSJan Kara dquot_incr_inodes(transfer_to[cnt], 1); 1864884d179dSJan Kara dquot_incr_space(transfer_to[cnt], cur_space); 1865884d179dSJan Kara dquot_resv_space(transfer_to[cnt], rsv_space); 1866884d179dSJan Kara 1867884d179dSJan Kara inode->i_dquot[cnt] = transfer_to[cnt]; 1868884d179dSJan Kara } 1869884d179dSJan Kara spin_unlock(&dq_data_lock); 1870884d179dSJan Kara up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); 1871884d179dSJan Kara 1872dc52dd3aSDmitry Monakhov mark_all_dquot_dirty(transfer_from); 1873dc52dd3aSDmitry Monakhov mark_all_dquot_dirty(transfer_to); 1874bf097aafSJan Kara flush_warnings(warn_to); 1875bf097aafSJan Kara flush_warnings(warn_from_inodes); 1876bf097aafSJan Kara flush_warnings(warn_from_space); 1877bc8e5f07SJan Kara /* Pass back references to put */ 1878dc52dd3aSDmitry Monakhov for (cnt = 0; cnt < MAXQUOTAS; cnt++) 18799e32784bSDmitry if (is_valid[cnt]) 1880bc8e5f07SJan Kara transfer_to[cnt] = transfer_from[cnt]; 188186f3cbecSJan Kara return 0; 1882884d179dSJan Kara over_quota: 1883884d179dSJan Kara spin_unlock(&dq_data_lock); 1884884d179dSJan Kara up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); 1885bf097aafSJan Kara flush_warnings(warn_to); 188686f3cbecSJan Kara return ret; 1887884d179dSJan Kara } 1888bc8e5f07SJan Kara EXPORT_SYMBOL(__dquot_transfer); 1889884d179dSJan Kara 18908ddd69d6SDmitry Monakhov /* Wrapper for transferring ownership of an inode for uid/gid only 18918ddd69d6SDmitry Monakhov * Called from FSXXX_setattr() 18928ddd69d6SDmitry Monakhov */ 1893b43fa828SChristoph Hellwig int dquot_transfer(struct inode *inode, struct iattr *iattr) 1894884d179dSJan Kara { 1895bc8e5f07SJan Kara struct dquot *transfer_to[MAXQUOTAS] = {}; 1896bc8e5f07SJan Kara struct super_block *sb = inode->i_sb; 1897bc8e5f07SJan Kara int ret; 18988ddd69d6SDmitry Monakhov 1899189eef59SChristoph Hellwig if (!dquot_active(inode)) 1900884d179dSJan Kara return 0; 1901bc8e5f07SJan Kara 19021a06d420SEric W. Biederman if (iattr->ia_valid & ATTR_UID && !uid_eq(iattr->ia_uid, inode->i_uid)) 1903aca645a6SEric W. Biederman transfer_to[USRQUOTA] = dqget(sb, make_kqid_uid(iattr->ia_uid)); 19041a06d420SEric W. Biederman if (iattr->ia_valid & ATTR_GID && !gid_eq(iattr->ia_gid, inode->i_gid)) 1905aca645a6SEric W. Biederman transfer_to[GRPQUOTA] = dqget(sb, make_kqid_gid(iattr->ia_gid)); 1906bc8e5f07SJan Kara 1907bc8e5f07SJan Kara ret = __dquot_transfer(inode, transfer_to); 1908bc8e5f07SJan Kara dqput_all(transfer_to); 1909bc8e5f07SJan Kara return ret; 1910884d179dSJan Kara } 1911b43fa828SChristoph Hellwig EXPORT_SYMBOL(dquot_transfer); 1912884d179dSJan Kara 1913884d179dSJan Kara /* 1914884d179dSJan Kara * Write info of quota file to disk 1915884d179dSJan Kara */ 1916884d179dSJan Kara int dquot_commit_info(struct super_block *sb, int type) 1917884d179dSJan Kara { 1918884d179dSJan Kara int ret; 1919884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 1920884d179dSJan Kara 1921884d179dSJan Kara mutex_lock(&dqopt->dqio_mutex); 1922884d179dSJan Kara ret = dqopt->ops[type]->write_file_info(sb, type); 1923884d179dSJan Kara mutex_unlock(&dqopt->dqio_mutex); 1924884d179dSJan Kara return ret; 1925884d179dSJan Kara } 1926884d179dSJan Kara EXPORT_SYMBOL(dquot_commit_info); 1927884d179dSJan Kara 1928884d179dSJan Kara /* 1929884d179dSJan Kara * Definitions of diskquota operations. 1930884d179dSJan Kara */ 193161e225dcSAlexey Dobriyan const struct dquot_operations dquot_operations = { 1932884d179dSJan Kara .write_dquot = dquot_commit, 1933884d179dSJan Kara .acquire_dquot = dquot_acquire, 1934884d179dSJan Kara .release_dquot = dquot_release, 1935884d179dSJan Kara .mark_dirty = dquot_mark_dquot_dirty, 1936884d179dSJan Kara .write_info = dquot_commit_info, 1937884d179dSJan Kara .alloc_dquot = dquot_alloc, 1938884d179dSJan Kara .destroy_dquot = dquot_destroy, 1939884d179dSJan Kara }; 1940123e9cafSChristoph Hellwig EXPORT_SYMBOL(dquot_operations); 1941884d179dSJan Kara 1942884d179dSJan Kara /* 1943907f4554SChristoph Hellwig * Generic helper for ->open on filesystems supporting disk quotas. 1944907f4554SChristoph Hellwig */ 1945907f4554SChristoph Hellwig int dquot_file_open(struct inode *inode, struct file *file) 1946907f4554SChristoph Hellwig { 1947907f4554SChristoph Hellwig int error; 1948907f4554SChristoph Hellwig 1949907f4554SChristoph Hellwig error = generic_file_open(inode, file); 1950907f4554SChristoph Hellwig if (!error && (file->f_mode & FMODE_WRITE)) 1951871a2931SChristoph Hellwig dquot_initialize(inode); 1952907f4554SChristoph Hellwig return error; 1953907f4554SChristoph Hellwig } 1954907f4554SChristoph Hellwig EXPORT_SYMBOL(dquot_file_open); 1955907f4554SChristoph Hellwig 1956907f4554SChristoph Hellwig /* 1957884d179dSJan Kara * Turn quota off on a device. type == -1 ==> quotaoff for all types (umount) 1958884d179dSJan Kara */ 19590f0dd62fSChristoph Hellwig int dquot_disable(struct super_block *sb, int type, unsigned int flags) 1960884d179dSJan Kara { 1961884d179dSJan Kara int cnt, ret = 0; 1962884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 1963884d179dSJan Kara struct inode *toputinode[MAXQUOTAS]; 1964884d179dSJan Kara 1965884d179dSJan Kara /* Cannot turn off usage accounting without turning off limits, or 1966884d179dSJan Kara * suspend quotas and simultaneously turn quotas off. */ 1967884d179dSJan Kara if ((flags & DQUOT_USAGE_ENABLED && !(flags & DQUOT_LIMITS_ENABLED)) 1968884d179dSJan Kara || (flags & DQUOT_SUSPENDED && flags & (DQUOT_LIMITS_ENABLED | 1969884d179dSJan Kara DQUOT_USAGE_ENABLED))) 1970884d179dSJan Kara return -EINVAL; 1971884d179dSJan Kara 1972884d179dSJan Kara /* We need to serialize quota_off() for device */ 1973884d179dSJan Kara mutex_lock(&dqopt->dqonoff_mutex); 1974884d179dSJan Kara 1975884d179dSJan Kara /* 1976884d179dSJan Kara * Skip everything if there's nothing to do. We have to do this because 1977884d179dSJan Kara * sometimes we are called when fill_super() failed and calling 1978884d179dSJan Kara * sync_fs() in such cases does no good. 1979884d179dSJan Kara */ 1980884d179dSJan Kara if (!sb_any_quota_loaded(sb)) { 1981884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 1982884d179dSJan Kara return 0; 1983884d179dSJan Kara } 1984884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1985884d179dSJan Kara toputinode[cnt] = NULL; 1986884d179dSJan Kara if (type != -1 && cnt != type) 1987884d179dSJan Kara continue; 1988884d179dSJan Kara if (!sb_has_quota_loaded(sb, cnt)) 1989884d179dSJan Kara continue; 1990884d179dSJan Kara 1991884d179dSJan Kara if (flags & DQUOT_SUSPENDED) { 1992884d179dSJan Kara spin_lock(&dq_state_lock); 1993884d179dSJan Kara dqopt->flags |= 1994884d179dSJan Kara dquot_state_flag(DQUOT_SUSPENDED, cnt); 1995884d179dSJan Kara spin_unlock(&dq_state_lock); 1996884d179dSJan Kara } else { 1997884d179dSJan Kara spin_lock(&dq_state_lock); 1998884d179dSJan Kara dqopt->flags &= ~dquot_state_flag(flags, cnt); 1999884d179dSJan Kara /* Turning off suspended quotas? */ 2000884d179dSJan Kara if (!sb_has_quota_loaded(sb, cnt) && 2001884d179dSJan Kara sb_has_quota_suspended(sb, cnt)) { 2002884d179dSJan Kara dqopt->flags &= ~dquot_state_flag( 2003884d179dSJan Kara DQUOT_SUSPENDED, cnt); 2004884d179dSJan Kara spin_unlock(&dq_state_lock); 2005884d179dSJan Kara iput(dqopt->files[cnt]); 2006884d179dSJan Kara dqopt->files[cnt] = NULL; 2007884d179dSJan Kara continue; 2008884d179dSJan Kara } 2009884d179dSJan Kara spin_unlock(&dq_state_lock); 2010884d179dSJan Kara } 2011884d179dSJan Kara 2012884d179dSJan Kara /* We still have to keep quota loaded? */ 2013884d179dSJan Kara if (sb_has_quota_loaded(sb, cnt) && !(flags & DQUOT_SUSPENDED)) 2014884d179dSJan Kara continue; 2015884d179dSJan Kara 2016884d179dSJan Kara /* Note: these are blocking operations */ 2017884d179dSJan Kara drop_dquot_ref(sb, cnt); 2018884d179dSJan Kara invalidate_dquots(sb, cnt); 2019884d179dSJan Kara /* 2020268157baSJan Kara * Now all dquots should be invalidated, all writes done so we 2021268157baSJan Kara * should be only users of the info. No locks needed. 2022884d179dSJan Kara */ 2023884d179dSJan Kara if (info_dirty(&dqopt->info[cnt])) 2024884d179dSJan Kara sb->dq_op->write_info(sb, cnt); 2025884d179dSJan Kara if (dqopt->ops[cnt]->free_file_info) 2026884d179dSJan Kara dqopt->ops[cnt]->free_file_info(sb, cnt); 2027884d179dSJan Kara put_quota_format(dqopt->info[cnt].dqi_format); 2028884d179dSJan Kara 2029884d179dSJan Kara toputinode[cnt] = dqopt->files[cnt]; 2030884d179dSJan Kara if (!sb_has_quota_loaded(sb, cnt)) 2031884d179dSJan Kara dqopt->files[cnt] = NULL; 2032884d179dSJan Kara dqopt->info[cnt].dqi_flags = 0; 2033884d179dSJan Kara dqopt->info[cnt].dqi_igrace = 0; 2034884d179dSJan Kara dqopt->info[cnt].dqi_bgrace = 0; 2035884d179dSJan Kara dqopt->ops[cnt] = NULL; 2036884d179dSJan Kara } 2037884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 2038884d179dSJan Kara 2039884d179dSJan Kara /* Skip syncing and setting flags if quota files are hidden */ 2040884d179dSJan Kara if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) 2041884d179dSJan Kara goto put_inodes; 2042884d179dSJan Kara 2043884d179dSJan Kara /* Sync the superblock so that buffers with quota data are written to 2044884d179dSJan Kara * disk (and so userspace sees correct data afterwards). */ 2045884d179dSJan Kara if (sb->s_op->sync_fs) 2046884d179dSJan Kara sb->s_op->sync_fs(sb, 1); 2047884d179dSJan Kara sync_blockdev(sb->s_bdev); 2048884d179dSJan Kara /* Now the quota files are just ordinary files and we can set the 2049884d179dSJan Kara * inode flags back. Moreover we discard the pagecache so that 2050884d179dSJan Kara * userspace sees the writes we did bypassing the pagecache. We 2051884d179dSJan Kara * must also discard the blockdev buffers so that we see the 2052884d179dSJan Kara * changes done by userspace on the next quotaon() */ 2053884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 2054884d179dSJan Kara if (toputinode[cnt]) { 2055884d179dSJan Kara mutex_lock(&dqopt->dqonoff_mutex); 2056884d179dSJan Kara /* If quota was reenabled in the meantime, we have 2057884d179dSJan Kara * nothing to do */ 2058884d179dSJan Kara if (!sb_has_quota_loaded(sb, cnt)) { 2059a80b12c3SJan Kara mutex_lock(&toputinode[cnt]->i_mutex); 2060884d179dSJan Kara toputinode[cnt]->i_flags &= ~(S_IMMUTABLE | 2061884d179dSJan Kara S_NOATIME | S_NOQUOTA); 2062268157baSJan Kara truncate_inode_pages(&toputinode[cnt]->i_data, 2063268157baSJan Kara 0); 2064884d179dSJan Kara mutex_unlock(&toputinode[cnt]->i_mutex); 206543d2932dSJan Kara mark_inode_dirty_sync(toputinode[cnt]); 2066884d179dSJan Kara } 2067884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 2068884d179dSJan Kara } 2069884d179dSJan Kara if (sb->s_bdev) 2070884d179dSJan Kara invalidate_bdev(sb->s_bdev); 2071884d179dSJan Kara put_inodes: 2072884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 2073884d179dSJan Kara if (toputinode[cnt]) { 2074884d179dSJan Kara /* On remount RO, we keep the inode pointer so that we 2075884d179dSJan Kara * can reenable quota on the subsequent remount RW. We 2076884d179dSJan Kara * have to check 'flags' variable and not use sb_has_ 2077884d179dSJan Kara * function because another quotaon / quotaoff could 2078884d179dSJan Kara * change global state before we got here. We refuse 2079884d179dSJan Kara * to suspend quotas when there is pending delete on 2080884d179dSJan Kara * the quota file... */ 2081884d179dSJan Kara if (!(flags & DQUOT_SUSPENDED)) 2082884d179dSJan Kara iput(toputinode[cnt]); 2083884d179dSJan Kara else if (!toputinode[cnt]->i_nlink) 2084884d179dSJan Kara ret = -EBUSY; 2085884d179dSJan Kara } 2086884d179dSJan Kara return ret; 2087884d179dSJan Kara } 20880f0dd62fSChristoph Hellwig EXPORT_SYMBOL(dquot_disable); 2089884d179dSJan Kara 2090287a8095SChristoph Hellwig int dquot_quota_off(struct super_block *sb, int type) 2091884d179dSJan Kara { 20920f0dd62fSChristoph Hellwig return dquot_disable(sb, type, 20930f0dd62fSChristoph Hellwig DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); 2094884d179dSJan Kara } 2095287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_quota_off); 20960f0dd62fSChristoph Hellwig 2097884d179dSJan Kara /* 2098884d179dSJan Kara * Turn quotas on on a device 2099884d179dSJan Kara */ 2100884d179dSJan Kara 2101884d179dSJan Kara /* 2102884d179dSJan Kara * Helper function to turn quotas on when we already have the inode of 2103884d179dSJan Kara * quota file and no quota information is loaded. 2104884d179dSJan Kara */ 2105884d179dSJan Kara static int vfs_load_quota_inode(struct inode *inode, int type, int format_id, 2106884d179dSJan Kara unsigned int flags) 2107884d179dSJan Kara { 2108884d179dSJan Kara struct quota_format_type *fmt = find_quota_format(format_id); 2109884d179dSJan Kara struct super_block *sb = inode->i_sb; 2110884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 2111884d179dSJan Kara int error; 2112884d179dSJan Kara int oldflags = -1; 2113884d179dSJan Kara 2114884d179dSJan Kara if (!fmt) 2115884d179dSJan Kara return -ESRCH; 2116884d179dSJan Kara if (!S_ISREG(inode->i_mode)) { 2117884d179dSJan Kara error = -EACCES; 2118884d179dSJan Kara goto out_fmt; 2119884d179dSJan Kara } 2120884d179dSJan Kara if (IS_RDONLY(inode)) { 2121884d179dSJan Kara error = -EROFS; 2122884d179dSJan Kara goto out_fmt; 2123884d179dSJan Kara } 2124884d179dSJan Kara if (!sb->s_op->quota_write || !sb->s_op->quota_read) { 2125884d179dSJan Kara error = -EINVAL; 2126884d179dSJan Kara goto out_fmt; 2127884d179dSJan Kara } 2128884d179dSJan Kara /* Usage always has to be set... */ 2129884d179dSJan Kara if (!(flags & DQUOT_USAGE_ENABLED)) { 2130884d179dSJan Kara error = -EINVAL; 2131884d179dSJan Kara goto out_fmt; 2132884d179dSJan Kara } 2133884d179dSJan Kara 2134884d179dSJan Kara if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) { 2135ab94c39bSJan Kara /* As we bypass the pagecache we must now flush all the 2136ab94c39bSJan Kara * dirty data and invalidate caches so that kernel sees 2137ab94c39bSJan Kara * changes from userspace. It is not enough to just flush 2138ab94c39bSJan Kara * the quota file since if blocksize < pagesize, invalidation 2139ab94c39bSJan Kara * of the cache could fail because of other unrelated dirty 2140ab94c39bSJan Kara * data */ 2141ab94c39bSJan Kara sync_filesystem(sb); 2142884d179dSJan Kara invalidate_bdev(sb->s_bdev); 2143884d179dSJan Kara } 2144884d179dSJan Kara mutex_lock(&dqopt->dqonoff_mutex); 2145884d179dSJan Kara if (sb_has_quota_loaded(sb, type)) { 2146884d179dSJan Kara error = -EBUSY; 2147884d179dSJan Kara goto out_lock; 2148884d179dSJan Kara } 2149884d179dSJan Kara 2150884d179dSJan Kara if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) { 2151884d179dSJan Kara /* We don't want quota and atime on quota files (deadlocks 2152884d179dSJan Kara * possible) Also nobody should write to the file - we use 2153884d179dSJan Kara * special IO operations which ignore the immutable bit. */ 2154a80b12c3SJan Kara mutex_lock(&inode->i_mutex); 2155268157baSJan Kara oldflags = inode->i_flags & (S_NOATIME | S_IMMUTABLE | 2156268157baSJan Kara S_NOQUOTA); 2157884d179dSJan Kara inode->i_flags |= S_NOQUOTA | S_NOATIME | S_IMMUTABLE; 2158dee86565SJan Kara mutex_unlock(&inode->i_mutex); 215926245c94SJan Kara /* 216026245c94SJan Kara * When S_NOQUOTA is set, remove dquot references as no more 216126245c94SJan Kara * references can be added 216226245c94SJan Kara */ 21639f754758SChristoph Hellwig __dquot_drop(inode); 2164884d179dSJan Kara } 2165884d179dSJan Kara 2166884d179dSJan Kara error = -EIO; 2167884d179dSJan Kara dqopt->files[type] = igrab(inode); 2168884d179dSJan Kara if (!dqopt->files[type]) 2169884d179dSJan Kara goto out_lock; 2170884d179dSJan Kara error = -EINVAL; 2171884d179dSJan Kara if (!fmt->qf_ops->check_quota_file(sb, type)) 2172884d179dSJan Kara goto out_file_init; 2173884d179dSJan Kara 2174884d179dSJan Kara dqopt->ops[type] = fmt->qf_ops; 2175884d179dSJan Kara dqopt->info[type].dqi_format = fmt; 2176884d179dSJan Kara dqopt->info[type].dqi_fmt_id = format_id; 2177884d179dSJan Kara INIT_LIST_HEAD(&dqopt->info[type].dqi_dirty_list); 2178884d179dSJan Kara mutex_lock(&dqopt->dqio_mutex); 2179268157baSJan Kara error = dqopt->ops[type]->read_file_info(sb, type); 2180268157baSJan Kara if (error < 0) { 2181884d179dSJan Kara mutex_unlock(&dqopt->dqio_mutex); 2182884d179dSJan Kara goto out_file_init; 2183884d179dSJan Kara } 218446fe44ceSJan Kara if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) 218546fe44ceSJan Kara dqopt->info[type].dqi_flags |= DQF_SYS_FILE; 2186884d179dSJan Kara mutex_unlock(&dqopt->dqio_mutex); 2187884d179dSJan Kara spin_lock(&dq_state_lock); 2188884d179dSJan Kara dqopt->flags |= dquot_state_flag(flags, type); 2189884d179dSJan Kara spin_unlock(&dq_state_lock); 2190884d179dSJan Kara 2191884d179dSJan Kara add_dquot_ref(sb, type); 2192884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 2193884d179dSJan Kara 2194884d179dSJan Kara return 0; 2195884d179dSJan Kara 2196884d179dSJan Kara out_file_init: 2197884d179dSJan Kara dqopt->files[type] = NULL; 2198884d179dSJan Kara iput(inode); 2199884d179dSJan Kara out_lock: 2200884d179dSJan Kara if (oldflags != -1) { 2201a80b12c3SJan Kara mutex_lock(&inode->i_mutex); 2202884d179dSJan Kara /* Set the flags back (in the case of accidental quotaon() 2203884d179dSJan Kara * on a wrong file we don't want to mess up the flags) */ 2204884d179dSJan Kara inode->i_flags &= ~(S_NOATIME | S_NOQUOTA | S_IMMUTABLE); 2205884d179dSJan Kara inode->i_flags |= oldflags; 2206dee86565SJan Kara mutex_unlock(&inode->i_mutex); 2207884d179dSJan Kara } 2208d01730d7SJiaying Zhang mutex_unlock(&dqopt->dqonoff_mutex); 2209884d179dSJan Kara out_fmt: 2210884d179dSJan Kara put_quota_format(fmt); 2211884d179dSJan Kara 2212884d179dSJan Kara return error; 2213884d179dSJan Kara } 2214884d179dSJan Kara 2215884d179dSJan Kara /* Reenable quotas on remount RW */ 22160f0dd62fSChristoph Hellwig int dquot_resume(struct super_block *sb, int type) 2217884d179dSJan Kara { 2218884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 2219884d179dSJan Kara struct inode *inode; 22200f0dd62fSChristoph Hellwig int ret = 0, cnt; 2221884d179dSJan Kara unsigned int flags; 2222884d179dSJan Kara 22230f0dd62fSChristoph Hellwig for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 22240f0dd62fSChristoph Hellwig if (type != -1 && cnt != type) 22250f0dd62fSChristoph Hellwig continue; 22260f0dd62fSChristoph Hellwig 2227884d179dSJan Kara mutex_lock(&dqopt->dqonoff_mutex); 22280f0dd62fSChristoph Hellwig if (!sb_has_quota_suspended(sb, cnt)) { 2229884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 22300f0dd62fSChristoph Hellwig continue; 2231884d179dSJan Kara } 22320f0dd62fSChristoph Hellwig inode = dqopt->files[cnt]; 22330f0dd62fSChristoph Hellwig dqopt->files[cnt] = NULL; 2234884d179dSJan Kara spin_lock(&dq_state_lock); 2235884d179dSJan Kara flags = dqopt->flags & dquot_state_flag(DQUOT_USAGE_ENABLED | 22360f0dd62fSChristoph Hellwig DQUOT_LIMITS_ENABLED, 22370f0dd62fSChristoph Hellwig cnt); 22380f0dd62fSChristoph Hellwig dqopt->flags &= ~dquot_state_flag(DQUOT_STATE_FLAGS, cnt); 2239884d179dSJan Kara spin_unlock(&dq_state_lock); 2240884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 2241884d179dSJan Kara 22420f0dd62fSChristoph Hellwig flags = dquot_generic_flag(flags, cnt); 22430f0dd62fSChristoph Hellwig ret = vfs_load_quota_inode(inode, cnt, 22440f0dd62fSChristoph Hellwig dqopt->info[cnt].dqi_fmt_id, flags); 2245884d179dSJan Kara iput(inode); 22460f0dd62fSChristoph Hellwig } 2247884d179dSJan Kara 2248884d179dSJan Kara return ret; 2249884d179dSJan Kara } 22500f0dd62fSChristoph Hellwig EXPORT_SYMBOL(dquot_resume); 2251884d179dSJan Kara 2252f00c9e44SJan Kara int dquot_quota_on(struct super_block *sb, int type, int format_id, 2253884d179dSJan Kara struct path *path) 2254884d179dSJan Kara { 2255884d179dSJan Kara int error = security_quota_on(path->dentry); 2256884d179dSJan Kara if (error) 2257884d179dSJan Kara return error; 2258884d179dSJan Kara /* Quota file not on the same filesystem? */ 2259d8c9584eSAl Viro if (path->dentry->d_sb != sb) 2260884d179dSJan Kara error = -EXDEV; 2261884d179dSJan Kara else 2262884d179dSJan Kara error = vfs_load_quota_inode(path->dentry->d_inode, type, 2263884d179dSJan Kara format_id, DQUOT_USAGE_ENABLED | 2264884d179dSJan Kara DQUOT_LIMITS_ENABLED); 2265884d179dSJan Kara return error; 2266884d179dSJan Kara } 2267287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_quota_on); 2268884d179dSJan Kara 2269884d179dSJan Kara /* 2270884d179dSJan Kara * More powerful function for turning on quotas allowing setting 2271884d179dSJan Kara * of individual quota flags 2272884d179dSJan Kara */ 2273287a8095SChristoph Hellwig int dquot_enable(struct inode *inode, int type, int format_id, 2274884d179dSJan Kara unsigned int flags) 2275884d179dSJan Kara { 2276884d179dSJan Kara int ret = 0; 2277884d179dSJan Kara struct super_block *sb = inode->i_sb; 2278884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 2279884d179dSJan Kara 2280884d179dSJan Kara /* Just unsuspend quotas? */ 22810f0dd62fSChristoph Hellwig BUG_ON(flags & DQUOT_SUSPENDED); 22820f0dd62fSChristoph Hellwig 2283884d179dSJan Kara if (!flags) 2284884d179dSJan Kara return 0; 2285884d179dSJan Kara /* Just updating flags needed? */ 2286884d179dSJan Kara if (sb_has_quota_loaded(sb, type)) { 2287884d179dSJan Kara mutex_lock(&dqopt->dqonoff_mutex); 2288884d179dSJan Kara /* Now do a reliable test... */ 2289884d179dSJan Kara if (!sb_has_quota_loaded(sb, type)) { 2290884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 2291884d179dSJan Kara goto load_quota; 2292884d179dSJan Kara } 2293884d179dSJan Kara if (flags & DQUOT_USAGE_ENABLED && 2294884d179dSJan Kara sb_has_quota_usage_enabled(sb, type)) { 2295884d179dSJan Kara ret = -EBUSY; 2296884d179dSJan Kara goto out_lock; 2297884d179dSJan Kara } 2298884d179dSJan Kara if (flags & DQUOT_LIMITS_ENABLED && 2299884d179dSJan Kara sb_has_quota_limits_enabled(sb, type)) { 2300884d179dSJan Kara ret = -EBUSY; 2301884d179dSJan Kara goto out_lock; 2302884d179dSJan Kara } 2303884d179dSJan Kara spin_lock(&dq_state_lock); 2304884d179dSJan Kara sb_dqopt(sb)->flags |= dquot_state_flag(flags, type); 2305884d179dSJan Kara spin_unlock(&dq_state_lock); 2306884d179dSJan Kara out_lock: 2307884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 2308884d179dSJan Kara return ret; 2309884d179dSJan Kara } 2310884d179dSJan Kara 2311884d179dSJan Kara load_quota: 2312884d179dSJan Kara return vfs_load_quota_inode(inode, type, format_id, flags); 2313884d179dSJan Kara } 2314287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_enable); 2315884d179dSJan Kara 2316884d179dSJan Kara /* 2317884d179dSJan Kara * This function is used when filesystem needs to initialize quotas 2318884d179dSJan Kara * during mount time. 2319884d179dSJan Kara */ 2320287a8095SChristoph Hellwig int dquot_quota_on_mount(struct super_block *sb, char *qf_name, 2321884d179dSJan Kara int format_id, int type) 2322884d179dSJan Kara { 2323884d179dSJan Kara struct dentry *dentry; 2324884d179dSJan Kara int error; 2325884d179dSJan Kara 2326c56818d7SJan Kara mutex_lock(&sb->s_root->d_inode->i_mutex); 2327884d179dSJan Kara dentry = lookup_one_len(qf_name, sb->s_root, strlen(qf_name)); 2328c56818d7SJan Kara mutex_unlock(&sb->s_root->d_inode->i_mutex); 2329884d179dSJan Kara if (IS_ERR(dentry)) 2330884d179dSJan Kara return PTR_ERR(dentry); 2331884d179dSJan Kara 2332884d179dSJan Kara if (!dentry->d_inode) { 2333884d179dSJan Kara error = -ENOENT; 2334884d179dSJan Kara goto out; 2335884d179dSJan Kara } 2336884d179dSJan Kara 2337884d179dSJan Kara error = security_quota_on(dentry); 2338884d179dSJan Kara if (!error) 2339884d179dSJan Kara error = vfs_load_quota_inode(dentry->d_inode, type, format_id, 2340884d179dSJan Kara DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); 2341884d179dSJan Kara 2342884d179dSJan Kara out: 2343884d179dSJan Kara dput(dentry); 2344884d179dSJan Kara return error; 2345884d179dSJan Kara } 2346287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_quota_on_mount); 2347884d179dSJan Kara 2348884d179dSJan Kara static inline qsize_t qbtos(qsize_t blocks) 2349884d179dSJan Kara { 2350884d179dSJan Kara return blocks << QIF_DQBLKSIZE_BITS; 2351884d179dSJan Kara } 2352884d179dSJan Kara 2353884d179dSJan Kara static inline qsize_t stoqb(qsize_t space) 2354884d179dSJan Kara { 2355884d179dSJan Kara return (space + QIF_DQBLKSIZE - 1) >> QIF_DQBLKSIZE_BITS; 2356884d179dSJan Kara } 2357884d179dSJan Kara 2358884d179dSJan Kara /* Generic routine for getting common part of quota structure */ 2359b9b2dd36SChristoph Hellwig static void do_get_dqblk(struct dquot *dquot, struct fs_disk_quota *di) 2360884d179dSJan Kara { 2361884d179dSJan Kara struct mem_dqblk *dm = &dquot->dq_dqb; 2362884d179dSJan Kara 2363b9b2dd36SChristoph Hellwig memset(di, 0, sizeof(*di)); 2364b9b2dd36SChristoph Hellwig di->d_version = FS_DQUOT_VERSION; 23654c376dcaSEric W. Biederman di->d_flags = dquot->dq_id.type == USRQUOTA ? 2366ade7ce31SChristoph Hellwig FS_USER_QUOTA : FS_GROUP_QUOTA; 23674c376dcaSEric W. Biederman di->d_id = from_kqid_munged(current_user_ns(), dquot->dq_id); 2368b9b2dd36SChristoph Hellwig 2369884d179dSJan Kara spin_lock(&dq_data_lock); 2370b9b2dd36SChristoph Hellwig di->d_blk_hardlimit = stoqb(dm->dqb_bhardlimit); 2371b9b2dd36SChristoph Hellwig di->d_blk_softlimit = stoqb(dm->dqb_bsoftlimit); 2372b9b2dd36SChristoph Hellwig di->d_ino_hardlimit = dm->dqb_ihardlimit; 2373b9b2dd36SChristoph Hellwig di->d_ino_softlimit = dm->dqb_isoftlimit; 2374b9b2dd36SChristoph Hellwig di->d_bcount = dm->dqb_curspace + dm->dqb_rsvspace; 2375b9b2dd36SChristoph Hellwig di->d_icount = dm->dqb_curinodes; 2376b9b2dd36SChristoph Hellwig di->d_btimer = dm->dqb_btime; 2377b9b2dd36SChristoph Hellwig di->d_itimer = dm->dqb_itime; 2378884d179dSJan Kara spin_unlock(&dq_data_lock); 2379884d179dSJan Kara } 2380884d179dSJan Kara 238174a8a103SEric W. Biederman int dquot_get_dqblk(struct super_block *sb, struct kqid qid, 2382b9b2dd36SChristoph Hellwig struct fs_disk_quota *di) 2383884d179dSJan Kara { 2384884d179dSJan Kara struct dquot *dquot; 2385884d179dSJan Kara 2386aca645a6SEric W. Biederman dquot = dqget(sb, qid); 2387dd6f3c6dSJan Kara if (!dquot) 2388884d179dSJan Kara return -ESRCH; 2389884d179dSJan Kara do_get_dqblk(dquot, di); 2390884d179dSJan Kara dqput(dquot); 2391884d179dSJan Kara 2392884d179dSJan Kara return 0; 2393884d179dSJan Kara } 2394287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_get_dqblk); 2395884d179dSJan Kara 2396c472b432SChristoph Hellwig #define VFS_FS_DQ_MASK \ 2397c472b432SChristoph Hellwig (FS_DQ_BCOUNT | FS_DQ_BSOFT | FS_DQ_BHARD | \ 2398c472b432SChristoph Hellwig FS_DQ_ICOUNT | FS_DQ_ISOFT | FS_DQ_IHARD | \ 2399c472b432SChristoph Hellwig FS_DQ_BTIMER | FS_DQ_ITIMER) 2400c472b432SChristoph Hellwig 2401884d179dSJan Kara /* Generic routine for setting common part of quota structure */ 2402c472b432SChristoph Hellwig static int do_set_dqblk(struct dquot *dquot, struct fs_disk_quota *di) 2403884d179dSJan Kara { 2404884d179dSJan Kara struct mem_dqblk *dm = &dquot->dq_dqb; 2405884d179dSJan Kara int check_blim = 0, check_ilim = 0; 24064c376dcaSEric W. Biederman struct mem_dqinfo *dqi = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_id.type]; 2407884d179dSJan Kara 2408c472b432SChristoph Hellwig if (di->d_fieldmask & ~VFS_FS_DQ_MASK) 2409c472b432SChristoph Hellwig return -EINVAL; 2410c472b432SChristoph Hellwig 2411c472b432SChristoph Hellwig if (((di->d_fieldmask & FS_DQ_BSOFT) && 2412c472b432SChristoph Hellwig (di->d_blk_softlimit > dqi->dqi_maxblimit)) || 2413c472b432SChristoph Hellwig ((di->d_fieldmask & FS_DQ_BHARD) && 2414c472b432SChristoph Hellwig (di->d_blk_hardlimit > dqi->dqi_maxblimit)) || 2415c472b432SChristoph Hellwig ((di->d_fieldmask & FS_DQ_ISOFT) && 2416c472b432SChristoph Hellwig (di->d_ino_softlimit > dqi->dqi_maxilimit)) || 2417c472b432SChristoph Hellwig ((di->d_fieldmask & FS_DQ_IHARD) && 2418c472b432SChristoph Hellwig (di->d_ino_hardlimit > dqi->dqi_maxilimit))) 2419884d179dSJan Kara return -ERANGE; 2420884d179dSJan Kara 2421884d179dSJan Kara spin_lock(&dq_data_lock); 2422c472b432SChristoph Hellwig if (di->d_fieldmask & FS_DQ_BCOUNT) { 2423c472b432SChristoph Hellwig dm->dqb_curspace = di->d_bcount - dm->dqb_rsvspace; 2424884d179dSJan Kara check_blim = 1; 242508261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags); 2426884d179dSJan Kara } 2427c472b432SChristoph Hellwig 2428c472b432SChristoph Hellwig if (di->d_fieldmask & FS_DQ_BSOFT) 2429c472b432SChristoph Hellwig dm->dqb_bsoftlimit = qbtos(di->d_blk_softlimit); 2430c472b432SChristoph Hellwig if (di->d_fieldmask & FS_DQ_BHARD) 2431c472b432SChristoph Hellwig dm->dqb_bhardlimit = qbtos(di->d_blk_hardlimit); 2432c472b432SChristoph Hellwig if (di->d_fieldmask & (FS_DQ_BSOFT | FS_DQ_BHARD)) { 2433884d179dSJan Kara check_blim = 1; 243408261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags); 2435884d179dSJan Kara } 2436c472b432SChristoph Hellwig 2437c472b432SChristoph Hellwig if (di->d_fieldmask & FS_DQ_ICOUNT) { 2438c472b432SChristoph Hellwig dm->dqb_curinodes = di->d_icount; 2439884d179dSJan Kara check_ilim = 1; 244008261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags); 2441884d179dSJan Kara } 2442c472b432SChristoph Hellwig 2443c472b432SChristoph Hellwig if (di->d_fieldmask & FS_DQ_ISOFT) 2444c472b432SChristoph Hellwig dm->dqb_isoftlimit = di->d_ino_softlimit; 2445c472b432SChristoph Hellwig if (di->d_fieldmask & FS_DQ_IHARD) 2446c472b432SChristoph Hellwig dm->dqb_ihardlimit = di->d_ino_hardlimit; 2447c472b432SChristoph Hellwig if (di->d_fieldmask & (FS_DQ_ISOFT | FS_DQ_IHARD)) { 2448884d179dSJan Kara check_ilim = 1; 244908261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags); 2450884d179dSJan Kara } 2451c472b432SChristoph Hellwig 2452c472b432SChristoph Hellwig if (di->d_fieldmask & FS_DQ_BTIMER) { 2453c472b432SChristoph Hellwig dm->dqb_btime = di->d_btimer; 2454884d179dSJan Kara check_blim = 1; 245508261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags); 2456884d179dSJan Kara } 2457c472b432SChristoph Hellwig 2458c472b432SChristoph Hellwig if (di->d_fieldmask & FS_DQ_ITIMER) { 2459c472b432SChristoph Hellwig dm->dqb_itime = di->d_itimer; 2460884d179dSJan Kara check_ilim = 1; 246108261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags); 2462884d179dSJan Kara } 2463884d179dSJan Kara 2464884d179dSJan Kara if (check_blim) { 2465268157baSJan Kara if (!dm->dqb_bsoftlimit || 2466268157baSJan Kara dm->dqb_curspace < dm->dqb_bsoftlimit) { 2467884d179dSJan Kara dm->dqb_btime = 0; 2468884d179dSJan Kara clear_bit(DQ_BLKS_B, &dquot->dq_flags); 2469c472b432SChristoph Hellwig } else if (!(di->d_fieldmask & FS_DQ_BTIMER)) 2470268157baSJan Kara /* Set grace only if user hasn't provided his own... */ 2471884d179dSJan Kara dm->dqb_btime = get_seconds() + dqi->dqi_bgrace; 2472884d179dSJan Kara } 2473884d179dSJan Kara if (check_ilim) { 2474268157baSJan Kara if (!dm->dqb_isoftlimit || 2475268157baSJan Kara dm->dqb_curinodes < dm->dqb_isoftlimit) { 2476884d179dSJan Kara dm->dqb_itime = 0; 2477884d179dSJan Kara clear_bit(DQ_INODES_B, &dquot->dq_flags); 2478c472b432SChristoph Hellwig } else if (!(di->d_fieldmask & FS_DQ_ITIMER)) 2479268157baSJan Kara /* Set grace only if user hasn't provided his own... */ 2480884d179dSJan Kara dm->dqb_itime = get_seconds() + dqi->dqi_igrace; 2481884d179dSJan Kara } 2482268157baSJan Kara if (dm->dqb_bhardlimit || dm->dqb_bsoftlimit || dm->dqb_ihardlimit || 2483268157baSJan Kara dm->dqb_isoftlimit) 2484884d179dSJan Kara clear_bit(DQ_FAKE_B, &dquot->dq_flags); 2485884d179dSJan Kara else 2486884d179dSJan Kara set_bit(DQ_FAKE_B, &dquot->dq_flags); 2487884d179dSJan Kara spin_unlock(&dq_data_lock); 2488884d179dSJan Kara mark_dquot_dirty(dquot); 2489884d179dSJan Kara 2490884d179dSJan Kara return 0; 2491884d179dSJan Kara } 2492884d179dSJan Kara 249374a8a103SEric W. Biederman int dquot_set_dqblk(struct super_block *sb, struct kqid qid, 2494c472b432SChristoph Hellwig struct fs_disk_quota *di) 2495884d179dSJan Kara { 2496884d179dSJan Kara struct dquot *dquot; 2497884d179dSJan Kara int rc; 2498884d179dSJan Kara 2499aca645a6SEric W. Biederman dquot = dqget(sb, qid); 2500884d179dSJan Kara if (!dquot) { 2501884d179dSJan Kara rc = -ESRCH; 2502884d179dSJan Kara goto out; 2503884d179dSJan Kara } 2504884d179dSJan Kara rc = do_set_dqblk(dquot, di); 2505884d179dSJan Kara dqput(dquot); 2506884d179dSJan Kara out: 2507884d179dSJan Kara return rc; 2508884d179dSJan Kara } 2509287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_set_dqblk); 2510884d179dSJan Kara 2511884d179dSJan Kara /* Generic routine for getting common part of quota file information */ 2512287a8095SChristoph Hellwig int dquot_get_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii) 2513884d179dSJan Kara { 2514884d179dSJan Kara struct mem_dqinfo *mi; 2515884d179dSJan Kara 2516884d179dSJan Kara mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); 2517884d179dSJan Kara if (!sb_has_quota_active(sb, type)) { 2518884d179dSJan Kara mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); 2519884d179dSJan Kara return -ESRCH; 2520884d179dSJan Kara } 2521884d179dSJan Kara mi = sb_dqopt(sb)->info + type; 2522884d179dSJan Kara spin_lock(&dq_data_lock); 2523884d179dSJan Kara ii->dqi_bgrace = mi->dqi_bgrace; 2524884d179dSJan Kara ii->dqi_igrace = mi->dqi_igrace; 252546fe44ceSJan Kara ii->dqi_flags = mi->dqi_flags & DQF_GETINFO_MASK; 2526884d179dSJan Kara ii->dqi_valid = IIF_ALL; 2527884d179dSJan Kara spin_unlock(&dq_data_lock); 2528884d179dSJan Kara mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); 2529884d179dSJan Kara return 0; 2530884d179dSJan Kara } 2531287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_get_dqinfo); 2532884d179dSJan Kara 2533884d179dSJan Kara /* Generic routine for setting common part of quota file information */ 2534287a8095SChristoph Hellwig int dquot_set_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii) 2535884d179dSJan Kara { 2536884d179dSJan Kara struct mem_dqinfo *mi; 2537884d179dSJan Kara int err = 0; 2538884d179dSJan Kara 2539884d179dSJan Kara mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); 2540884d179dSJan Kara if (!sb_has_quota_active(sb, type)) { 2541884d179dSJan Kara err = -ESRCH; 2542884d179dSJan Kara goto out; 2543884d179dSJan Kara } 2544884d179dSJan Kara mi = sb_dqopt(sb)->info + type; 2545884d179dSJan Kara spin_lock(&dq_data_lock); 2546884d179dSJan Kara if (ii->dqi_valid & IIF_BGRACE) 2547884d179dSJan Kara mi->dqi_bgrace = ii->dqi_bgrace; 2548884d179dSJan Kara if (ii->dqi_valid & IIF_IGRACE) 2549884d179dSJan Kara mi->dqi_igrace = ii->dqi_igrace; 2550884d179dSJan Kara if (ii->dqi_valid & IIF_FLAGS) 255146fe44ceSJan Kara mi->dqi_flags = (mi->dqi_flags & ~DQF_SETINFO_MASK) | 255246fe44ceSJan Kara (ii->dqi_flags & DQF_SETINFO_MASK); 2553884d179dSJan Kara spin_unlock(&dq_data_lock); 2554884d179dSJan Kara mark_info_dirty(sb, type); 2555884d179dSJan Kara /* Force write to disk */ 2556884d179dSJan Kara sb->dq_op->write_info(sb, type); 2557884d179dSJan Kara out: 2558884d179dSJan Kara mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); 2559884d179dSJan Kara return err; 2560884d179dSJan Kara } 2561287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_set_dqinfo); 2562884d179dSJan Kara 2563287a8095SChristoph Hellwig const struct quotactl_ops dquot_quotactl_ops = { 2564287a8095SChristoph Hellwig .quota_on = dquot_quota_on, 2565287a8095SChristoph Hellwig .quota_off = dquot_quota_off, 2566287a8095SChristoph Hellwig .quota_sync = dquot_quota_sync, 2567287a8095SChristoph Hellwig .get_info = dquot_get_dqinfo, 2568287a8095SChristoph Hellwig .set_info = dquot_set_dqinfo, 2569287a8095SChristoph Hellwig .get_dqblk = dquot_get_dqblk, 2570287a8095SChristoph Hellwig .set_dqblk = dquot_set_dqblk 2571884d179dSJan Kara }; 2572287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_quotactl_ops); 2573dde95888SDmitry Monakhov 2574dde95888SDmitry Monakhov static int do_proc_dqstats(struct ctl_table *table, int write, 2575dde95888SDmitry Monakhov void __user *buffer, size_t *lenp, loff_t *ppos) 2576dde95888SDmitry Monakhov { 2577dde95888SDmitry Monakhov unsigned int type = (int *)table->data - dqstats.stat; 2578f32764bdSDmitry Monakhov 2579f32764bdSDmitry Monakhov /* Update global table */ 2580f32764bdSDmitry Monakhov dqstats.stat[type] = 2581f32764bdSDmitry Monakhov percpu_counter_sum_positive(&dqstats.counter[type]); 2582dde95888SDmitry Monakhov return proc_dointvec(table, write, buffer, lenp, ppos); 2583dde95888SDmitry Monakhov } 2584dde95888SDmitry Monakhov 2585884d179dSJan Kara static ctl_table fs_dqstats_table[] = { 2586884d179dSJan Kara { 2587884d179dSJan Kara .procname = "lookups", 2588dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_LOOKUPS], 2589884d179dSJan Kara .maxlen = sizeof(int), 2590884d179dSJan Kara .mode = 0444, 2591dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2592884d179dSJan Kara }, 2593884d179dSJan Kara { 2594884d179dSJan Kara .procname = "drops", 2595dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_DROPS], 2596884d179dSJan Kara .maxlen = sizeof(int), 2597884d179dSJan Kara .mode = 0444, 2598dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2599884d179dSJan Kara }, 2600884d179dSJan Kara { 2601884d179dSJan Kara .procname = "reads", 2602dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_READS], 2603884d179dSJan Kara .maxlen = sizeof(int), 2604884d179dSJan Kara .mode = 0444, 2605dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2606884d179dSJan Kara }, 2607884d179dSJan Kara { 2608884d179dSJan Kara .procname = "writes", 2609dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_WRITES], 2610884d179dSJan Kara .maxlen = sizeof(int), 2611884d179dSJan Kara .mode = 0444, 2612dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2613884d179dSJan Kara }, 2614884d179dSJan Kara { 2615884d179dSJan Kara .procname = "cache_hits", 2616dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_CACHE_HITS], 2617884d179dSJan Kara .maxlen = sizeof(int), 2618884d179dSJan Kara .mode = 0444, 2619dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2620884d179dSJan Kara }, 2621884d179dSJan Kara { 2622884d179dSJan Kara .procname = "allocated_dquots", 2623dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_ALLOC_DQUOTS], 2624884d179dSJan Kara .maxlen = sizeof(int), 2625884d179dSJan Kara .mode = 0444, 2626dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2627884d179dSJan Kara }, 2628884d179dSJan Kara { 2629884d179dSJan Kara .procname = "free_dquots", 2630dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_FREE_DQUOTS], 2631884d179dSJan Kara .maxlen = sizeof(int), 2632884d179dSJan Kara .mode = 0444, 2633dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2634884d179dSJan Kara }, 2635884d179dSJan Kara { 2636884d179dSJan Kara .procname = "syncs", 2637dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_SYNCS], 2638884d179dSJan Kara .maxlen = sizeof(int), 2639884d179dSJan Kara .mode = 0444, 2640dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2641884d179dSJan Kara }, 2642884d179dSJan Kara #ifdef CONFIG_PRINT_QUOTA_WARNING 2643884d179dSJan Kara { 2644884d179dSJan Kara .procname = "warnings", 2645884d179dSJan Kara .data = &flag_print_warnings, 2646884d179dSJan Kara .maxlen = sizeof(int), 2647884d179dSJan Kara .mode = 0644, 26486d456111SEric W. Biederman .proc_handler = proc_dointvec, 2649884d179dSJan Kara }, 2650884d179dSJan Kara #endif 2651ab09203eSEric W. Biederman { }, 2652884d179dSJan Kara }; 2653884d179dSJan Kara 2654884d179dSJan Kara static ctl_table fs_table[] = { 2655884d179dSJan Kara { 2656884d179dSJan Kara .procname = "quota", 2657884d179dSJan Kara .mode = 0555, 2658884d179dSJan Kara .child = fs_dqstats_table, 2659884d179dSJan Kara }, 2660ab09203eSEric W. Biederman { }, 2661884d179dSJan Kara }; 2662884d179dSJan Kara 2663884d179dSJan Kara static ctl_table sys_table[] = { 2664884d179dSJan Kara { 2665884d179dSJan Kara .procname = "fs", 2666884d179dSJan Kara .mode = 0555, 2667884d179dSJan Kara .child = fs_table, 2668884d179dSJan Kara }, 2669ab09203eSEric W. Biederman { }, 2670884d179dSJan Kara }; 2671884d179dSJan Kara 2672884d179dSJan Kara static int __init dquot_init(void) 2673884d179dSJan Kara { 2674f32764bdSDmitry Monakhov int i, ret; 2675884d179dSJan Kara unsigned long nr_hash, order; 2676884d179dSJan Kara 2677884d179dSJan Kara printk(KERN_NOTICE "VFS: Disk quotas %s\n", __DQUOT_VERSION__); 2678884d179dSJan Kara 2679884d179dSJan Kara register_sysctl_table(sys_table); 2680884d179dSJan Kara 2681884d179dSJan Kara dquot_cachep = kmem_cache_create("dquot", 2682884d179dSJan Kara sizeof(struct dquot), sizeof(unsigned long) * 4, 2683884d179dSJan Kara (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| 2684884d179dSJan Kara SLAB_MEM_SPREAD|SLAB_PANIC), 2685884d179dSJan Kara NULL); 2686884d179dSJan Kara 2687884d179dSJan Kara order = 0; 2688884d179dSJan Kara dquot_hash = (struct hlist_head *)__get_free_pages(GFP_ATOMIC, order); 2689884d179dSJan Kara if (!dquot_hash) 2690884d179dSJan Kara panic("Cannot create dquot hash table"); 2691884d179dSJan Kara 2692f32764bdSDmitry Monakhov for (i = 0; i < _DQST_DQSTAT_LAST; i++) { 2693f32764bdSDmitry Monakhov ret = percpu_counter_init(&dqstats.counter[i], 0); 2694f32764bdSDmitry Monakhov if (ret) 2695f32764bdSDmitry Monakhov panic("Cannot create dquot stat counters"); 2696f32764bdSDmitry Monakhov } 2697dde95888SDmitry Monakhov 2698884d179dSJan Kara /* Find power-of-two hlist_heads which can fit into allocation */ 2699884d179dSJan Kara nr_hash = (1UL << order) * PAGE_SIZE / sizeof(struct hlist_head); 2700884d179dSJan Kara dq_hash_bits = 0; 2701884d179dSJan Kara do { 2702884d179dSJan Kara dq_hash_bits++; 2703884d179dSJan Kara } while (nr_hash >> dq_hash_bits); 2704884d179dSJan Kara dq_hash_bits--; 2705884d179dSJan Kara 2706884d179dSJan Kara nr_hash = 1UL << dq_hash_bits; 2707884d179dSJan Kara dq_hash_mask = nr_hash - 1; 2708884d179dSJan Kara for (i = 0; i < nr_hash; i++) 2709884d179dSJan Kara INIT_HLIST_HEAD(dquot_hash + i); 2710884d179dSJan Kara 2711884d179dSJan Kara printk("Dquot-cache hash table entries: %ld (order %ld, %ld bytes)\n", 2712884d179dSJan Kara nr_hash, order, (PAGE_SIZE << order)); 2713884d179dSJan Kara 2714884d179dSJan Kara register_shrinker(&dqcache_shrinker); 2715884d179dSJan Kara 2716884d179dSJan Kara return 0; 2717884d179dSJan Kara } 2718884d179dSJan Kara module_init(dquot_init); 2719