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> 74884d179dSJan Kara #include <linux/kmod.h> 75884d179dSJan Kara #include <linux/namei.h> 76884d179dSJan Kara #include <linux/buffer_head.h> 77884d179dSJan Kara #include <linux/capability.h> 78884d179dSJan Kara #include <linux/quotaops.h> 79884d179dSJan Kara #include <linux/writeback.h> /* for inode_lock, oddly enough.. */ 80884d179dSJan Kara 81884d179dSJan Kara #include <asm/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: 119884d179dSJan Kara * i_mutex > dqonoff_sem > journal_lock > dqptr_sem > dquot->dq_lock > 120884d179dSJan Kara * dqio_mutex 121884d179dSJan Kara * The lock ordering of dqptr_sem imposed by quota code is only dqonoff_sem > 122884d179dSJan Kara * dqptr_sem. But filesystem has to count with the fact that functions such as 123884d179dSJan Kara * dquot_alloc_space() acquire dqptr_sem and they usually have to be called 124884d179dSJan Kara * from inside a transaction to keep filesystem consistency after a crash. Also 125884d179dSJan Kara * filesystems usually want to do some IO on dquot from ->mark_dirty which is 126884d179dSJan Kara * called with dqptr_sem held. 127884d179dSJan Kara * i_mutex on quota files is special (it's below dqio_mutex) 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 135da8d1ba2SSergey Senozhatsky #if defined(CONFIG_QUOTA_DEBUG) || defined(CONFIG_PRINT_QUOTA_WARNING) 136884d179dSJan Kara static char *quotatypes[] = INITQFNAMES; 137da8d1ba2SSergey Senozhatsky #endif 138884d179dSJan Kara static struct quota_format_type *quota_formats; /* List of registered formats */ 139884d179dSJan Kara static struct quota_module_name module_names[] = INIT_QUOTA_MODULE_NAMES; 140884d179dSJan Kara 141884d179dSJan Kara /* SLAB cache for dquot structures */ 142884d179dSJan Kara static struct kmem_cache *dquot_cachep; 143884d179dSJan Kara 144884d179dSJan Kara int register_quota_format(struct quota_format_type *fmt) 145884d179dSJan Kara { 146884d179dSJan Kara spin_lock(&dq_list_lock); 147884d179dSJan Kara fmt->qf_next = quota_formats; 148884d179dSJan Kara quota_formats = fmt; 149884d179dSJan Kara spin_unlock(&dq_list_lock); 150884d179dSJan Kara return 0; 151884d179dSJan Kara } 152884d179dSJan Kara EXPORT_SYMBOL(register_quota_format); 153884d179dSJan Kara 154884d179dSJan Kara void unregister_quota_format(struct quota_format_type *fmt) 155884d179dSJan Kara { 156884d179dSJan Kara struct quota_format_type **actqf; 157884d179dSJan Kara 158884d179dSJan Kara spin_lock(&dq_list_lock); 159268157baSJan Kara for (actqf = "a_formats; *actqf && *actqf != fmt; 160268157baSJan Kara actqf = &(*actqf)->qf_next) 161268157baSJan Kara ; 162884d179dSJan Kara if (*actqf) 163884d179dSJan Kara *actqf = (*actqf)->qf_next; 164884d179dSJan Kara spin_unlock(&dq_list_lock); 165884d179dSJan Kara } 166884d179dSJan Kara EXPORT_SYMBOL(unregister_quota_format); 167884d179dSJan Kara 168884d179dSJan Kara static struct quota_format_type *find_quota_format(int id) 169884d179dSJan Kara { 170884d179dSJan Kara struct quota_format_type *actqf; 171884d179dSJan Kara 172884d179dSJan Kara spin_lock(&dq_list_lock); 173268157baSJan Kara for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id; 174268157baSJan Kara actqf = actqf->qf_next) 175268157baSJan Kara ; 176884d179dSJan Kara if (!actqf || !try_module_get(actqf->qf_owner)) { 177884d179dSJan Kara int qm; 178884d179dSJan Kara 179884d179dSJan Kara spin_unlock(&dq_list_lock); 180884d179dSJan Kara 181268157baSJan Kara for (qm = 0; module_names[qm].qm_fmt_id && 182268157baSJan Kara module_names[qm].qm_fmt_id != id; qm++) 183268157baSJan Kara ; 184268157baSJan Kara if (!module_names[qm].qm_fmt_id || 185268157baSJan Kara request_module(module_names[qm].qm_mod_name)) 186884d179dSJan Kara return NULL; 187884d179dSJan Kara 188884d179dSJan Kara spin_lock(&dq_list_lock); 189268157baSJan Kara for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id; 190268157baSJan Kara actqf = actqf->qf_next) 191268157baSJan Kara ; 192884d179dSJan Kara if (actqf && !try_module_get(actqf->qf_owner)) 193884d179dSJan Kara actqf = NULL; 194884d179dSJan Kara } 195884d179dSJan Kara spin_unlock(&dq_list_lock); 196884d179dSJan Kara return actqf; 197884d179dSJan Kara } 198884d179dSJan Kara 199884d179dSJan Kara static void put_quota_format(struct quota_format_type *fmt) 200884d179dSJan Kara { 201884d179dSJan Kara module_put(fmt->qf_owner); 202884d179dSJan Kara } 203884d179dSJan Kara 204884d179dSJan Kara /* 205884d179dSJan Kara * Dquot List Management: 206884d179dSJan Kara * The quota code uses three lists for dquot management: the inuse_list, 207884d179dSJan Kara * free_dquots, and dquot_hash[] array. A single dquot structure may be 208884d179dSJan Kara * on all three lists, depending on its current state. 209884d179dSJan Kara * 210884d179dSJan Kara * All dquots are placed to the end of inuse_list when first created, and this 211884d179dSJan Kara * list is used for invalidate operation, which must look at every dquot. 212884d179dSJan Kara * 213884d179dSJan Kara * Unused dquots (dq_count == 0) are added to the free_dquots list when freed, 214884d179dSJan Kara * and this list is searched whenever we need an available dquot. Dquots are 215884d179dSJan Kara * removed from the list as soon as they are used again, and 216884d179dSJan Kara * dqstats.free_dquots gives the number of dquots on the list. When 217884d179dSJan Kara * dquot is invalidated it's completely released from memory. 218884d179dSJan Kara * 219884d179dSJan Kara * Dquots with a specific identity (device, type and id) are placed on 220884d179dSJan Kara * one of the dquot_hash[] hash chains. The provides an efficient search 221884d179dSJan Kara * mechanism to locate a specific dquot. 222884d179dSJan Kara */ 223884d179dSJan Kara 224884d179dSJan Kara static LIST_HEAD(inuse_list); 225884d179dSJan Kara static LIST_HEAD(free_dquots); 226884d179dSJan Kara static unsigned int dq_hash_bits, dq_hash_mask; 227884d179dSJan Kara static struct hlist_head *dquot_hash; 228884d179dSJan Kara 229884d179dSJan Kara struct dqstats dqstats; 230884d179dSJan Kara EXPORT_SYMBOL(dqstats); 231884d179dSJan Kara 2320a5a9c72SJan Kara static qsize_t inode_get_rsv_space(struct inode *inode); 233871a2931SChristoph Hellwig static void __dquot_initialize(struct inode *inode, int type); 2340a5a9c72SJan Kara 235884d179dSJan Kara static inline unsigned int 236884d179dSJan Kara hashfn(const struct super_block *sb, unsigned int id, int type) 237884d179dSJan Kara { 238884d179dSJan Kara unsigned long tmp; 239884d179dSJan Kara 240884d179dSJan Kara tmp = (((unsigned long)sb>>L1_CACHE_SHIFT) ^ id) * (MAXQUOTAS - type); 241884d179dSJan Kara return (tmp + (tmp >> dq_hash_bits)) & dq_hash_mask; 242884d179dSJan Kara } 243884d179dSJan Kara 244884d179dSJan Kara /* 245884d179dSJan Kara * Following list functions expect dq_list_lock to be held 246884d179dSJan Kara */ 247884d179dSJan Kara static inline void insert_dquot_hash(struct dquot *dquot) 248884d179dSJan Kara { 249268157baSJan Kara struct hlist_head *head; 250268157baSJan Kara head = dquot_hash + hashfn(dquot->dq_sb, dquot->dq_id, dquot->dq_type); 251884d179dSJan Kara hlist_add_head(&dquot->dq_hash, head); 252884d179dSJan Kara } 253884d179dSJan Kara 254884d179dSJan Kara static inline void remove_dquot_hash(struct dquot *dquot) 255884d179dSJan Kara { 256884d179dSJan Kara hlist_del_init(&dquot->dq_hash); 257884d179dSJan Kara } 258884d179dSJan Kara 2597a2435d8SJan Kara static struct dquot *find_dquot(unsigned int hashent, struct super_block *sb, 2607a2435d8SJan Kara unsigned int id, int type) 261884d179dSJan Kara { 262884d179dSJan Kara struct hlist_node *node; 263884d179dSJan Kara struct dquot *dquot; 264884d179dSJan Kara 265884d179dSJan Kara hlist_for_each (node, dquot_hash+hashent) { 266884d179dSJan Kara dquot = hlist_entry(node, struct dquot, dq_hash); 267268157baSJan Kara if (dquot->dq_sb == sb && dquot->dq_id == id && 268268157baSJan Kara dquot->dq_type == type) 269884d179dSJan Kara return dquot; 270884d179dSJan Kara } 271dd6f3c6dSJan Kara return NULL; 272884d179dSJan Kara } 273884d179dSJan Kara 274884d179dSJan Kara /* Add a dquot to the tail of the free list */ 275884d179dSJan Kara static inline void put_dquot_last(struct dquot *dquot) 276884d179dSJan Kara { 277884d179dSJan Kara list_add_tail(&dquot->dq_free, &free_dquots); 278dde95888SDmitry Monakhov dqstats_inc(DQST_FREE_DQUOTS); 279884d179dSJan Kara } 280884d179dSJan Kara 281884d179dSJan Kara static inline void remove_free_dquot(struct dquot *dquot) 282884d179dSJan Kara { 283884d179dSJan Kara if (list_empty(&dquot->dq_free)) 284884d179dSJan Kara return; 285884d179dSJan Kara list_del_init(&dquot->dq_free); 286dde95888SDmitry Monakhov dqstats_dec(DQST_FREE_DQUOTS); 287884d179dSJan Kara } 288884d179dSJan Kara 289884d179dSJan Kara static inline void put_inuse(struct dquot *dquot) 290884d179dSJan Kara { 291884d179dSJan Kara /* We add to the back of inuse list so we don't have to restart 292884d179dSJan Kara * when traversing this list and we block */ 293884d179dSJan Kara list_add_tail(&dquot->dq_inuse, &inuse_list); 294dde95888SDmitry Monakhov dqstats_inc(DQST_ALLOC_DQUOTS); 295884d179dSJan Kara } 296884d179dSJan Kara 297884d179dSJan Kara static inline void remove_inuse(struct dquot *dquot) 298884d179dSJan Kara { 299dde95888SDmitry Monakhov dqstats_dec(DQST_ALLOC_DQUOTS); 300884d179dSJan Kara list_del(&dquot->dq_inuse); 301884d179dSJan Kara } 302884d179dSJan Kara /* 303884d179dSJan Kara * End of list functions needing dq_list_lock 304884d179dSJan Kara */ 305884d179dSJan Kara 306884d179dSJan Kara static void wait_on_dquot(struct dquot *dquot) 307884d179dSJan Kara { 308884d179dSJan Kara mutex_lock(&dquot->dq_lock); 309884d179dSJan Kara mutex_unlock(&dquot->dq_lock); 310884d179dSJan Kara } 311884d179dSJan Kara 312884d179dSJan Kara static inline int dquot_dirty(struct dquot *dquot) 313884d179dSJan Kara { 314884d179dSJan Kara return test_bit(DQ_MOD_B, &dquot->dq_flags); 315884d179dSJan Kara } 316884d179dSJan Kara 317884d179dSJan Kara static inline int mark_dquot_dirty(struct dquot *dquot) 318884d179dSJan Kara { 319884d179dSJan Kara return dquot->dq_sb->dq_op->mark_dirty(dquot); 320884d179dSJan Kara } 321884d179dSJan Kara 322eabf290dSDmitry Monakhov /* Mark dquot dirty in atomic manner, and return it's old dirty flag state */ 323884d179dSJan Kara int dquot_mark_dquot_dirty(struct dquot *dquot) 324884d179dSJan Kara { 325eabf290dSDmitry Monakhov int ret = 1; 326eabf290dSDmitry Monakhov 327eabf290dSDmitry Monakhov /* If quota is dirty already, we don't have to acquire dq_list_lock */ 328eabf290dSDmitry Monakhov if (test_bit(DQ_MOD_B, &dquot->dq_flags)) 329eabf290dSDmitry Monakhov return 1; 330eabf290dSDmitry Monakhov 331884d179dSJan Kara spin_lock(&dq_list_lock); 332eabf290dSDmitry Monakhov if (!test_and_set_bit(DQ_MOD_B, &dquot->dq_flags)) { 333884d179dSJan Kara list_add(&dquot->dq_dirty, &sb_dqopt(dquot->dq_sb)-> 334884d179dSJan Kara info[dquot->dq_type].dqi_dirty_list); 335eabf290dSDmitry Monakhov ret = 0; 336eabf290dSDmitry Monakhov } 337884d179dSJan Kara spin_unlock(&dq_list_lock); 338eabf290dSDmitry Monakhov return ret; 339884d179dSJan Kara } 340884d179dSJan Kara EXPORT_SYMBOL(dquot_mark_dquot_dirty); 341884d179dSJan Kara 342dc52dd3aSDmitry Monakhov /* Dirtify all the dquots - this can block when journalling */ 343dc52dd3aSDmitry Monakhov static inline int mark_all_dquot_dirty(struct dquot * const *dquot) 344dc52dd3aSDmitry Monakhov { 345dc52dd3aSDmitry Monakhov int ret, err, cnt; 346dc52dd3aSDmitry Monakhov 347dc52dd3aSDmitry Monakhov ret = err = 0; 348dc52dd3aSDmitry Monakhov for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 349dc52dd3aSDmitry Monakhov if (dquot[cnt]) 350dc52dd3aSDmitry Monakhov /* Even in case of error we have to continue */ 351dc52dd3aSDmitry Monakhov ret = mark_dquot_dirty(dquot[cnt]); 352dc52dd3aSDmitry Monakhov if (!err) 353dc52dd3aSDmitry Monakhov err = ret; 354dc52dd3aSDmitry Monakhov } 355dc52dd3aSDmitry Monakhov return err; 356dc52dd3aSDmitry Monakhov } 357dc52dd3aSDmitry Monakhov 358dc52dd3aSDmitry Monakhov static inline void dqput_all(struct dquot **dquot) 359dc52dd3aSDmitry Monakhov { 360dc52dd3aSDmitry Monakhov unsigned int cnt; 361dc52dd3aSDmitry Monakhov 362dc52dd3aSDmitry Monakhov for (cnt = 0; cnt < MAXQUOTAS; cnt++) 363dc52dd3aSDmitry Monakhov dqput(dquot[cnt]); 364dc52dd3aSDmitry Monakhov } 365dc52dd3aSDmitry Monakhov 366884d179dSJan Kara /* This function needs dq_list_lock */ 367884d179dSJan Kara static inline int clear_dquot_dirty(struct dquot *dquot) 368884d179dSJan Kara { 369884d179dSJan Kara if (!test_and_clear_bit(DQ_MOD_B, &dquot->dq_flags)) 370884d179dSJan Kara return 0; 371884d179dSJan Kara list_del_init(&dquot->dq_dirty); 372884d179dSJan Kara return 1; 373884d179dSJan Kara } 374884d179dSJan Kara 375884d179dSJan Kara void mark_info_dirty(struct super_block *sb, int type) 376884d179dSJan Kara { 377884d179dSJan Kara set_bit(DQF_INFO_DIRTY_B, &sb_dqopt(sb)->info[type].dqi_flags); 378884d179dSJan Kara } 379884d179dSJan Kara EXPORT_SYMBOL(mark_info_dirty); 380884d179dSJan Kara 381884d179dSJan Kara /* 382884d179dSJan Kara * Read dquot from disk and alloc space for it 383884d179dSJan Kara */ 384884d179dSJan Kara 385884d179dSJan Kara int dquot_acquire(struct dquot *dquot) 386884d179dSJan Kara { 387884d179dSJan Kara int ret = 0, ret2 = 0; 388884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); 389884d179dSJan Kara 390884d179dSJan Kara mutex_lock(&dquot->dq_lock); 391884d179dSJan Kara mutex_lock(&dqopt->dqio_mutex); 392884d179dSJan Kara if (!test_bit(DQ_READ_B, &dquot->dq_flags)) 393884d179dSJan Kara ret = dqopt->ops[dquot->dq_type]->read_dqblk(dquot); 394884d179dSJan Kara if (ret < 0) 395884d179dSJan Kara goto out_iolock; 396884d179dSJan Kara set_bit(DQ_READ_B, &dquot->dq_flags); 397884d179dSJan Kara /* Instantiate dquot if needed */ 398884d179dSJan Kara if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && !dquot->dq_off) { 399884d179dSJan Kara ret = dqopt->ops[dquot->dq_type]->commit_dqblk(dquot); 400884d179dSJan Kara /* Write the info if needed */ 401268157baSJan Kara if (info_dirty(&dqopt->info[dquot->dq_type])) { 402268157baSJan Kara ret2 = dqopt->ops[dquot->dq_type]->write_file_info( 403268157baSJan Kara dquot->dq_sb, dquot->dq_type); 404268157baSJan Kara } 405884d179dSJan Kara if (ret < 0) 406884d179dSJan Kara goto out_iolock; 407884d179dSJan Kara if (ret2 < 0) { 408884d179dSJan Kara ret = ret2; 409884d179dSJan Kara goto out_iolock; 410884d179dSJan Kara } 411884d179dSJan Kara } 412884d179dSJan Kara set_bit(DQ_ACTIVE_B, &dquot->dq_flags); 413884d179dSJan Kara out_iolock: 414884d179dSJan Kara mutex_unlock(&dqopt->dqio_mutex); 415884d179dSJan Kara mutex_unlock(&dquot->dq_lock); 416884d179dSJan Kara return ret; 417884d179dSJan Kara } 418884d179dSJan Kara EXPORT_SYMBOL(dquot_acquire); 419884d179dSJan Kara 420884d179dSJan Kara /* 421884d179dSJan Kara * Write dquot to disk 422884d179dSJan Kara */ 423884d179dSJan Kara int dquot_commit(struct dquot *dquot) 424884d179dSJan Kara { 425884d179dSJan Kara int ret = 0, ret2 = 0; 426884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); 427884d179dSJan Kara 428884d179dSJan Kara mutex_lock(&dqopt->dqio_mutex); 429884d179dSJan Kara spin_lock(&dq_list_lock); 430884d179dSJan Kara if (!clear_dquot_dirty(dquot)) { 431884d179dSJan Kara spin_unlock(&dq_list_lock); 432884d179dSJan Kara goto out_sem; 433884d179dSJan Kara } 434884d179dSJan Kara spin_unlock(&dq_list_lock); 435884d179dSJan Kara /* Inactive dquot can be only if there was error during read/init 436884d179dSJan Kara * => we have better not writing it */ 437884d179dSJan Kara if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { 438884d179dSJan Kara ret = dqopt->ops[dquot->dq_type]->commit_dqblk(dquot); 439268157baSJan Kara if (info_dirty(&dqopt->info[dquot->dq_type])) { 440268157baSJan Kara ret2 = dqopt->ops[dquot->dq_type]->write_file_info( 441268157baSJan Kara dquot->dq_sb, dquot->dq_type); 442268157baSJan Kara } 443884d179dSJan Kara if (ret >= 0) 444884d179dSJan Kara ret = ret2; 445884d179dSJan Kara } 446884d179dSJan Kara out_sem: 447884d179dSJan Kara mutex_unlock(&dqopt->dqio_mutex); 448884d179dSJan Kara return ret; 449884d179dSJan Kara } 450884d179dSJan Kara EXPORT_SYMBOL(dquot_commit); 451884d179dSJan Kara 452884d179dSJan Kara /* 453884d179dSJan Kara * Release dquot 454884d179dSJan Kara */ 455884d179dSJan Kara int dquot_release(struct dquot *dquot) 456884d179dSJan Kara { 457884d179dSJan Kara int ret = 0, ret2 = 0; 458884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); 459884d179dSJan Kara 460884d179dSJan Kara mutex_lock(&dquot->dq_lock); 461884d179dSJan Kara /* Check whether we are not racing with some other dqget() */ 462884d179dSJan Kara if (atomic_read(&dquot->dq_count) > 1) 463884d179dSJan Kara goto out_dqlock; 464884d179dSJan Kara mutex_lock(&dqopt->dqio_mutex); 465884d179dSJan Kara if (dqopt->ops[dquot->dq_type]->release_dqblk) { 466884d179dSJan Kara ret = dqopt->ops[dquot->dq_type]->release_dqblk(dquot); 467884d179dSJan Kara /* Write the info */ 468268157baSJan Kara if (info_dirty(&dqopt->info[dquot->dq_type])) { 469268157baSJan Kara ret2 = dqopt->ops[dquot->dq_type]->write_file_info( 470268157baSJan Kara dquot->dq_sb, dquot->dq_type); 471268157baSJan Kara } 472884d179dSJan Kara if (ret >= 0) 473884d179dSJan Kara ret = ret2; 474884d179dSJan Kara } 475884d179dSJan Kara clear_bit(DQ_ACTIVE_B, &dquot->dq_flags); 476884d179dSJan Kara mutex_unlock(&dqopt->dqio_mutex); 477884d179dSJan Kara out_dqlock: 478884d179dSJan Kara mutex_unlock(&dquot->dq_lock); 479884d179dSJan Kara return ret; 480884d179dSJan Kara } 481884d179dSJan Kara EXPORT_SYMBOL(dquot_release); 482884d179dSJan Kara 483884d179dSJan Kara void dquot_destroy(struct dquot *dquot) 484884d179dSJan Kara { 485884d179dSJan Kara kmem_cache_free(dquot_cachep, dquot); 486884d179dSJan Kara } 487884d179dSJan Kara EXPORT_SYMBOL(dquot_destroy); 488884d179dSJan Kara 489884d179dSJan Kara static inline void do_destroy_dquot(struct dquot *dquot) 490884d179dSJan Kara { 491884d179dSJan Kara dquot->dq_sb->dq_op->destroy_dquot(dquot); 492884d179dSJan Kara } 493884d179dSJan Kara 494884d179dSJan Kara /* Invalidate all dquots on the list. Note that this function is called after 495884d179dSJan Kara * quota is disabled and pointers from inodes removed so there cannot be new 496884d179dSJan Kara * quota users. There can still be some users of quotas due to inodes being 497884d179dSJan Kara * just deleted or pruned by prune_icache() (those are not attached to any 498884d179dSJan Kara * list) or parallel quotactl call. We have to wait for such users. 499884d179dSJan Kara */ 500884d179dSJan Kara static void invalidate_dquots(struct super_block *sb, int type) 501884d179dSJan Kara { 502884d179dSJan Kara struct dquot *dquot, *tmp; 503884d179dSJan Kara 504884d179dSJan Kara restart: 505884d179dSJan Kara spin_lock(&dq_list_lock); 506884d179dSJan Kara list_for_each_entry_safe(dquot, tmp, &inuse_list, dq_inuse) { 507884d179dSJan Kara if (dquot->dq_sb != sb) 508884d179dSJan Kara continue; 509884d179dSJan Kara if (dquot->dq_type != type) 510884d179dSJan Kara continue; 511884d179dSJan Kara /* Wait for dquot users */ 512884d179dSJan Kara if (atomic_read(&dquot->dq_count)) { 513884d179dSJan Kara DEFINE_WAIT(wait); 514884d179dSJan Kara 515884d179dSJan Kara atomic_inc(&dquot->dq_count); 516884d179dSJan Kara prepare_to_wait(&dquot->dq_wait_unused, &wait, 517884d179dSJan Kara TASK_UNINTERRUPTIBLE); 518884d179dSJan Kara spin_unlock(&dq_list_lock); 519884d179dSJan Kara /* Once dqput() wakes us up, we know it's time to free 520884d179dSJan Kara * the dquot. 521884d179dSJan Kara * IMPORTANT: we rely on the fact that there is always 522884d179dSJan Kara * at most one process waiting for dquot to free. 523884d179dSJan Kara * Otherwise dq_count would be > 1 and we would never 524884d179dSJan Kara * wake up. 525884d179dSJan Kara */ 526884d179dSJan Kara if (atomic_read(&dquot->dq_count) > 1) 527884d179dSJan Kara schedule(); 528884d179dSJan Kara finish_wait(&dquot->dq_wait_unused, &wait); 529884d179dSJan Kara dqput(dquot); 530884d179dSJan Kara /* At this moment dquot() need not exist (it could be 531884d179dSJan Kara * reclaimed by prune_dqcache(). Hence we must 532884d179dSJan Kara * restart. */ 533884d179dSJan Kara goto restart; 534884d179dSJan Kara } 535884d179dSJan Kara /* 536884d179dSJan Kara * Quota now has no users and it has been written on last 537884d179dSJan Kara * dqput() 538884d179dSJan Kara */ 539884d179dSJan Kara remove_dquot_hash(dquot); 540884d179dSJan Kara remove_free_dquot(dquot); 541884d179dSJan Kara remove_inuse(dquot); 542884d179dSJan Kara do_destroy_dquot(dquot); 543884d179dSJan Kara } 544884d179dSJan Kara spin_unlock(&dq_list_lock); 545884d179dSJan Kara } 546884d179dSJan Kara 547884d179dSJan Kara /* Call callback for every active dquot on given filesystem */ 548884d179dSJan Kara int dquot_scan_active(struct super_block *sb, 549884d179dSJan Kara int (*fn)(struct dquot *dquot, unsigned long priv), 550884d179dSJan Kara unsigned long priv) 551884d179dSJan Kara { 552884d179dSJan Kara struct dquot *dquot, *old_dquot = NULL; 553884d179dSJan Kara int ret = 0; 554884d179dSJan Kara 555884d179dSJan Kara mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); 556884d179dSJan Kara spin_lock(&dq_list_lock); 557884d179dSJan Kara list_for_each_entry(dquot, &inuse_list, dq_inuse) { 558884d179dSJan Kara if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) 559884d179dSJan Kara continue; 560884d179dSJan Kara if (dquot->dq_sb != sb) 561884d179dSJan Kara continue; 562884d179dSJan Kara /* Now we have active dquot so we can just increase use count */ 563884d179dSJan Kara atomic_inc(&dquot->dq_count); 564884d179dSJan Kara spin_unlock(&dq_list_lock); 565dde95888SDmitry Monakhov dqstats_inc(DQST_LOOKUPS); 566884d179dSJan Kara dqput(old_dquot); 567884d179dSJan Kara old_dquot = dquot; 568884d179dSJan Kara ret = fn(dquot, priv); 569884d179dSJan Kara if (ret < 0) 570884d179dSJan Kara goto out; 571884d179dSJan Kara spin_lock(&dq_list_lock); 572884d179dSJan Kara /* We are safe to continue now because our dquot could not 573884d179dSJan Kara * be moved out of the inuse list while we hold the reference */ 574884d179dSJan Kara } 575884d179dSJan Kara spin_unlock(&dq_list_lock); 576884d179dSJan Kara out: 577884d179dSJan Kara dqput(old_dquot); 578884d179dSJan Kara mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); 579884d179dSJan Kara return ret; 580884d179dSJan Kara } 581884d179dSJan Kara EXPORT_SYMBOL(dquot_scan_active); 582884d179dSJan Kara 583287a8095SChristoph Hellwig int dquot_quota_sync(struct super_block *sb, int type, int wait) 584884d179dSJan Kara { 585884d179dSJan Kara struct list_head *dirty; 586884d179dSJan Kara struct dquot *dquot; 587884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 588884d179dSJan Kara int cnt; 589884d179dSJan Kara 590884d179dSJan Kara mutex_lock(&dqopt->dqonoff_mutex); 591884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 592884d179dSJan Kara if (type != -1 && cnt != type) 593884d179dSJan Kara continue; 594884d179dSJan Kara if (!sb_has_quota_active(sb, cnt)) 595884d179dSJan Kara continue; 596884d179dSJan Kara spin_lock(&dq_list_lock); 597884d179dSJan Kara dirty = &dqopt->info[cnt].dqi_dirty_list; 598884d179dSJan Kara while (!list_empty(dirty)) { 599268157baSJan Kara dquot = list_first_entry(dirty, struct dquot, 600268157baSJan Kara dq_dirty); 601884d179dSJan Kara /* Dirty and inactive can be only bad dquot... */ 602884d179dSJan Kara if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { 603884d179dSJan Kara clear_dquot_dirty(dquot); 604884d179dSJan Kara continue; 605884d179dSJan Kara } 606884d179dSJan Kara /* Now we have active dquot from which someone is 607884d179dSJan Kara * holding reference so we can safely just increase 608884d179dSJan Kara * use count */ 609884d179dSJan Kara atomic_inc(&dquot->dq_count); 610884d179dSJan Kara spin_unlock(&dq_list_lock); 611dde95888SDmitry Monakhov dqstats_inc(DQST_LOOKUPS); 612884d179dSJan Kara sb->dq_op->write_dquot(dquot); 613884d179dSJan Kara dqput(dquot); 614884d179dSJan Kara spin_lock(&dq_list_lock); 615884d179dSJan Kara } 616884d179dSJan Kara spin_unlock(&dq_list_lock); 617884d179dSJan Kara } 618884d179dSJan Kara 619884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 620884d179dSJan Kara if ((cnt == type || type == -1) && sb_has_quota_active(sb, cnt) 621884d179dSJan Kara && info_dirty(&dqopt->info[cnt])) 622884d179dSJan Kara sb->dq_op->write_info(sb, cnt); 623dde95888SDmitry Monakhov dqstats_inc(DQST_SYNCS); 624884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 625884d179dSJan Kara 6265fb324adSChristoph Hellwig if (!wait || (sb_dqopt(sb)->flags & DQUOT_QUOTA_SYS_FILE)) 6275fb324adSChristoph Hellwig return 0; 6285fb324adSChristoph Hellwig 6295fb324adSChristoph Hellwig /* This is not very clever (and fast) but currently I don't know about 6305fb324adSChristoph Hellwig * any other simple way of getting quota data to disk and we must get 6315fb324adSChristoph Hellwig * them there for userspace to be visible... */ 6325fb324adSChristoph Hellwig if (sb->s_op->sync_fs) 6335fb324adSChristoph Hellwig sb->s_op->sync_fs(sb, 1); 6345fb324adSChristoph Hellwig sync_blockdev(sb->s_bdev); 6355fb324adSChristoph Hellwig 6365fb324adSChristoph Hellwig /* 6375fb324adSChristoph Hellwig * Now when everything is written we can discard the pagecache so 6385fb324adSChristoph Hellwig * that userspace sees the changes. 6395fb324adSChristoph Hellwig */ 6405fb324adSChristoph Hellwig mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); 6415fb324adSChristoph Hellwig for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 6425fb324adSChristoph Hellwig if (type != -1 && cnt != type) 6435fb324adSChristoph Hellwig continue; 6445fb324adSChristoph Hellwig if (!sb_has_quota_active(sb, cnt)) 6455fb324adSChristoph Hellwig continue; 6465fb324adSChristoph Hellwig mutex_lock_nested(&sb_dqopt(sb)->files[cnt]->i_mutex, 6475fb324adSChristoph Hellwig I_MUTEX_QUOTA); 6485fb324adSChristoph Hellwig truncate_inode_pages(&sb_dqopt(sb)->files[cnt]->i_data, 0); 6495fb324adSChristoph Hellwig mutex_unlock(&sb_dqopt(sb)->files[cnt]->i_mutex); 6505fb324adSChristoph Hellwig } 6515fb324adSChristoph Hellwig mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); 6525fb324adSChristoph Hellwig 653884d179dSJan Kara return 0; 654884d179dSJan Kara } 655287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_quota_sync); 656884d179dSJan Kara 657884d179dSJan Kara /* Free unused dquots from cache */ 658884d179dSJan Kara static void prune_dqcache(int count) 659884d179dSJan Kara { 660884d179dSJan Kara struct list_head *head; 661884d179dSJan Kara struct dquot *dquot; 662884d179dSJan Kara 663884d179dSJan Kara head = free_dquots.prev; 664884d179dSJan Kara while (head != &free_dquots && count) { 665884d179dSJan Kara dquot = list_entry(head, struct dquot, dq_free); 666884d179dSJan Kara remove_dquot_hash(dquot); 667884d179dSJan Kara remove_free_dquot(dquot); 668884d179dSJan Kara remove_inuse(dquot); 669884d179dSJan Kara do_destroy_dquot(dquot); 670884d179dSJan Kara count--; 671884d179dSJan Kara head = free_dquots.prev; 672884d179dSJan Kara } 673884d179dSJan Kara } 674884d179dSJan Kara 675884d179dSJan Kara /* 676884d179dSJan Kara * This is called from kswapd when we think we need some 677884d179dSJan Kara * more memory 678884d179dSJan Kara */ 6797f8275d0SDave Chinner static int shrink_dqcache_memory(struct shrinker *shrink, int nr, gfp_t gfp_mask) 680884d179dSJan Kara { 681884d179dSJan Kara if (nr) { 682884d179dSJan Kara spin_lock(&dq_list_lock); 683884d179dSJan Kara prune_dqcache(nr); 684884d179dSJan Kara spin_unlock(&dq_list_lock); 685884d179dSJan Kara } 686f32764bdSDmitry Monakhov return ((unsigned) 687f32764bdSDmitry Monakhov percpu_counter_read_positive(&dqstats.counter[DQST_FREE_DQUOTS]) 688f32764bdSDmitry Monakhov /100) * sysctl_vfs_cache_pressure; 689884d179dSJan Kara } 690884d179dSJan Kara 691884d179dSJan Kara static struct shrinker dqcache_shrinker = { 692884d179dSJan Kara .shrink = shrink_dqcache_memory, 693884d179dSJan Kara .seeks = DEFAULT_SEEKS, 694884d179dSJan Kara }; 695884d179dSJan Kara 696884d179dSJan Kara /* 697884d179dSJan Kara * Put reference to dquot 698884d179dSJan Kara * NOTE: If you change this function please check whether dqput_blocks() works right... 699884d179dSJan Kara */ 700884d179dSJan Kara void dqput(struct dquot *dquot) 701884d179dSJan Kara { 702884d179dSJan Kara int ret; 703884d179dSJan Kara 704884d179dSJan Kara if (!dquot) 705884d179dSJan Kara return; 70662af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 707884d179dSJan Kara if (!atomic_read(&dquot->dq_count)) { 708884d179dSJan Kara printk("VFS: dqput: trying to free free dquot\n"); 709884d179dSJan Kara printk("VFS: device %s, dquot of %s %d\n", 710884d179dSJan Kara dquot->dq_sb->s_id, 711884d179dSJan Kara quotatypes[dquot->dq_type], 712884d179dSJan Kara dquot->dq_id); 713884d179dSJan Kara BUG(); 714884d179dSJan Kara } 715884d179dSJan Kara #endif 716dde95888SDmitry Monakhov dqstats_inc(DQST_DROPS); 717884d179dSJan Kara we_slept: 718884d179dSJan Kara spin_lock(&dq_list_lock); 719884d179dSJan Kara if (atomic_read(&dquot->dq_count) > 1) { 720884d179dSJan Kara /* We have more than one user... nothing to do */ 721884d179dSJan Kara atomic_dec(&dquot->dq_count); 722884d179dSJan Kara /* Releasing dquot during quotaoff phase? */ 723884d179dSJan Kara if (!sb_has_quota_active(dquot->dq_sb, dquot->dq_type) && 724884d179dSJan Kara atomic_read(&dquot->dq_count) == 1) 725884d179dSJan Kara wake_up(&dquot->dq_wait_unused); 726884d179dSJan Kara spin_unlock(&dq_list_lock); 727884d179dSJan Kara return; 728884d179dSJan Kara } 729884d179dSJan Kara /* Need to release dquot? */ 730884d179dSJan Kara if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && dquot_dirty(dquot)) { 731884d179dSJan Kara spin_unlock(&dq_list_lock); 732884d179dSJan Kara /* Commit dquot before releasing */ 733884d179dSJan Kara ret = dquot->dq_sb->dq_op->write_dquot(dquot); 734884d179dSJan Kara if (ret < 0) { 735884d179dSJan Kara printk(KERN_ERR "VFS: cannot write quota structure on " 736884d179dSJan Kara "device %s (error %d). Quota may get out of " 737884d179dSJan Kara "sync!\n", dquot->dq_sb->s_id, ret); 738884d179dSJan Kara /* 739884d179dSJan Kara * We clear dirty bit anyway, so that we avoid 740884d179dSJan Kara * infinite loop here 741884d179dSJan Kara */ 742884d179dSJan Kara spin_lock(&dq_list_lock); 743884d179dSJan Kara clear_dquot_dirty(dquot); 744884d179dSJan Kara spin_unlock(&dq_list_lock); 745884d179dSJan Kara } 746884d179dSJan Kara goto we_slept; 747884d179dSJan Kara } 748884d179dSJan Kara /* Clear flag in case dquot was inactive (something bad happened) */ 749884d179dSJan Kara clear_dquot_dirty(dquot); 750884d179dSJan Kara if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { 751884d179dSJan Kara spin_unlock(&dq_list_lock); 752884d179dSJan Kara dquot->dq_sb->dq_op->release_dquot(dquot); 753884d179dSJan Kara goto we_slept; 754884d179dSJan Kara } 755884d179dSJan Kara atomic_dec(&dquot->dq_count); 75662af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 757884d179dSJan Kara /* sanity check */ 758884d179dSJan Kara BUG_ON(!list_empty(&dquot->dq_free)); 759884d179dSJan Kara #endif 760884d179dSJan Kara put_dquot_last(dquot); 761884d179dSJan Kara spin_unlock(&dq_list_lock); 762884d179dSJan Kara } 763884d179dSJan Kara EXPORT_SYMBOL(dqput); 764884d179dSJan Kara 765884d179dSJan Kara struct dquot *dquot_alloc(struct super_block *sb, int type) 766884d179dSJan Kara { 767884d179dSJan Kara return kmem_cache_zalloc(dquot_cachep, GFP_NOFS); 768884d179dSJan Kara } 769884d179dSJan Kara EXPORT_SYMBOL(dquot_alloc); 770884d179dSJan Kara 771884d179dSJan Kara static struct dquot *get_empty_dquot(struct super_block *sb, int type) 772884d179dSJan Kara { 773884d179dSJan Kara struct dquot *dquot; 774884d179dSJan Kara 775884d179dSJan Kara dquot = sb->dq_op->alloc_dquot(sb, type); 776884d179dSJan Kara if(!dquot) 777dd6f3c6dSJan Kara return NULL; 778884d179dSJan Kara 779884d179dSJan Kara mutex_init(&dquot->dq_lock); 780884d179dSJan Kara INIT_LIST_HEAD(&dquot->dq_free); 781884d179dSJan Kara INIT_LIST_HEAD(&dquot->dq_inuse); 782884d179dSJan Kara INIT_HLIST_NODE(&dquot->dq_hash); 783884d179dSJan Kara INIT_LIST_HEAD(&dquot->dq_dirty); 784884d179dSJan Kara init_waitqueue_head(&dquot->dq_wait_unused); 785884d179dSJan Kara dquot->dq_sb = sb; 786884d179dSJan Kara dquot->dq_type = type; 787884d179dSJan Kara atomic_set(&dquot->dq_count, 1); 788884d179dSJan Kara 789884d179dSJan Kara return dquot; 790884d179dSJan Kara } 791884d179dSJan Kara 792884d179dSJan Kara /* 793884d179dSJan Kara * Get reference to dquot 794884d179dSJan Kara * 795884d179dSJan Kara * Locking is slightly tricky here. We are guarded from parallel quotaoff() 796884d179dSJan Kara * destroying our dquot by: 797884d179dSJan Kara * a) checking for quota flags under dq_list_lock and 798884d179dSJan Kara * b) getting a reference to dquot before we release dq_list_lock 799884d179dSJan Kara */ 800884d179dSJan Kara struct dquot *dqget(struct super_block *sb, unsigned int id, int type) 801884d179dSJan Kara { 802884d179dSJan Kara unsigned int hashent = hashfn(sb, id, type); 803dd6f3c6dSJan Kara struct dquot *dquot = NULL, *empty = NULL; 804884d179dSJan Kara 805884d179dSJan Kara if (!sb_has_quota_active(sb, type)) 806dd6f3c6dSJan Kara return NULL; 807884d179dSJan Kara we_slept: 808884d179dSJan Kara spin_lock(&dq_list_lock); 809884d179dSJan Kara spin_lock(&dq_state_lock); 810884d179dSJan Kara if (!sb_has_quota_active(sb, type)) { 811884d179dSJan Kara spin_unlock(&dq_state_lock); 812884d179dSJan Kara spin_unlock(&dq_list_lock); 813884d179dSJan Kara goto out; 814884d179dSJan Kara } 815884d179dSJan Kara spin_unlock(&dq_state_lock); 816884d179dSJan Kara 817dd6f3c6dSJan Kara dquot = find_dquot(hashent, sb, id, type); 818dd6f3c6dSJan Kara if (!dquot) { 819dd6f3c6dSJan Kara if (!empty) { 820884d179dSJan Kara spin_unlock(&dq_list_lock); 821dd6f3c6dSJan Kara empty = get_empty_dquot(sb, type); 822dd6f3c6dSJan Kara if (!empty) 823884d179dSJan Kara schedule(); /* Try to wait for a moment... */ 824884d179dSJan Kara goto we_slept; 825884d179dSJan Kara } 826884d179dSJan Kara dquot = empty; 827dd6f3c6dSJan Kara empty = NULL; 828884d179dSJan Kara dquot->dq_id = id; 829884d179dSJan Kara /* all dquots go on the inuse_list */ 830884d179dSJan Kara put_inuse(dquot); 831884d179dSJan Kara /* hash it first so it can be found */ 832884d179dSJan Kara insert_dquot_hash(dquot); 833884d179dSJan Kara spin_unlock(&dq_list_lock); 834dde95888SDmitry Monakhov dqstats_inc(DQST_LOOKUPS); 835884d179dSJan Kara } else { 836884d179dSJan Kara if (!atomic_read(&dquot->dq_count)) 837884d179dSJan Kara remove_free_dquot(dquot); 838884d179dSJan Kara atomic_inc(&dquot->dq_count); 839884d179dSJan Kara spin_unlock(&dq_list_lock); 840dde95888SDmitry Monakhov dqstats_inc(DQST_CACHE_HITS); 841dde95888SDmitry Monakhov dqstats_inc(DQST_LOOKUPS); 842884d179dSJan Kara } 843268157baSJan Kara /* Wait for dq_lock - after this we know that either dquot_release() is 844268157baSJan Kara * already finished or it will be canceled due to dq_count > 1 test */ 845884d179dSJan Kara wait_on_dquot(dquot); 846268157baSJan Kara /* Read the dquot / allocate space in quota file */ 847268157baSJan Kara if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && 848268157baSJan Kara sb->dq_op->acquire_dquot(dquot) < 0) { 849884d179dSJan Kara dqput(dquot); 850dd6f3c6dSJan Kara dquot = NULL; 851884d179dSJan Kara goto out; 852884d179dSJan Kara } 85362af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 854884d179dSJan Kara BUG_ON(!dquot->dq_sb); /* Has somebody invalidated entry under us? */ 855884d179dSJan Kara #endif 856884d179dSJan Kara out: 857884d179dSJan Kara if (empty) 858884d179dSJan Kara do_destroy_dquot(empty); 859884d179dSJan Kara 860884d179dSJan Kara return dquot; 861884d179dSJan Kara } 862884d179dSJan Kara EXPORT_SYMBOL(dqget); 863884d179dSJan Kara 864884d179dSJan Kara static int dqinit_needed(struct inode *inode, int type) 865884d179dSJan Kara { 866884d179dSJan Kara int cnt; 867884d179dSJan Kara 868884d179dSJan Kara if (IS_NOQUOTA(inode)) 869884d179dSJan Kara return 0; 870884d179dSJan Kara if (type != -1) 871dd6f3c6dSJan Kara return !inode->i_dquot[type]; 872884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 873dd6f3c6dSJan Kara if (!inode->i_dquot[cnt]) 874884d179dSJan Kara return 1; 875884d179dSJan Kara return 0; 876884d179dSJan Kara } 877884d179dSJan Kara 878884d179dSJan Kara /* This routine is guarded by dqonoff_mutex mutex */ 879884d179dSJan Kara static void add_dquot_ref(struct super_block *sb, int type) 880884d179dSJan Kara { 881884d179dSJan Kara struct inode *inode, *old_inode = NULL; 88262af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 8830a5a9c72SJan Kara int reserved = 0; 8844c5e6c0eSJan Kara #endif 885884d179dSJan Kara 886884d179dSJan Kara spin_lock(&inode_lock); 887884d179dSJan Kara list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { 888*a4ffdde6SAl Viro if (inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW)) 8893ae5080fSLinus Torvalds continue; 89062af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 8910a5a9c72SJan Kara if (unlikely(inode_get_rsv_space(inode) > 0)) 8920a5a9c72SJan Kara reserved = 1; 8934c5e6c0eSJan Kara #endif 894884d179dSJan Kara if (!atomic_read(&inode->i_writecount)) 895884d179dSJan Kara continue; 896884d179dSJan Kara if (!dqinit_needed(inode, type)) 897884d179dSJan Kara continue; 898884d179dSJan Kara 899884d179dSJan Kara __iget(inode); 900884d179dSJan Kara spin_unlock(&inode_lock); 901884d179dSJan Kara 902884d179dSJan Kara iput(old_inode); 903871a2931SChristoph Hellwig __dquot_initialize(inode, type); 904884d179dSJan Kara /* We hold a reference to 'inode' so it couldn't have been 905884d179dSJan Kara * removed from s_inodes list while we dropped the inode_lock. 906884d179dSJan Kara * We cannot iput the inode now as we can be holding the last 907884d179dSJan Kara * reference and we cannot iput it under inode_lock. So we 908884d179dSJan Kara * keep the reference and iput it later. */ 909884d179dSJan Kara old_inode = inode; 910884d179dSJan Kara spin_lock(&inode_lock); 911884d179dSJan Kara } 912884d179dSJan Kara spin_unlock(&inode_lock); 913884d179dSJan Kara iput(old_inode); 9140a5a9c72SJan Kara 91562af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 9160a5a9c72SJan Kara if (reserved) { 9170a5a9c72SJan Kara printk(KERN_WARNING "VFS (%s): Writes happened before quota" 9180a5a9c72SJan Kara " was turned on thus quota information is probably " 9190a5a9c72SJan Kara "inconsistent. Please run quotacheck(8).\n", sb->s_id); 9200a5a9c72SJan Kara } 9214c5e6c0eSJan Kara #endif 922884d179dSJan Kara } 923884d179dSJan Kara 924268157baSJan Kara /* 925268157baSJan Kara * Return 0 if dqput() won't block. 926268157baSJan Kara * (note that 1 doesn't necessarily mean blocking) 927268157baSJan Kara */ 928884d179dSJan Kara static inline int dqput_blocks(struct dquot *dquot) 929884d179dSJan Kara { 930884d179dSJan Kara if (atomic_read(&dquot->dq_count) <= 1) 931884d179dSJan Kara return 1; 932884d179dSJan Kara return 0; 933884d179dSJan Kara } 934884d179dSJan Kara 935268157baSJan Kara /* 936268157baSJan Kara * Remove references to dquots from inode and add dquot to list for freeing 937268157baSJan Kara * if we have the last referece to dquot 938268157baSJan Kara * We can't race with anybody because we hold dqptr_sem for writing... 939268157baSJan Kara */ 940884d179dSJan Kara static int remove_inode_dquot_ref(struct inode *inode, int type, 941884d179dSJan Kara struct list_head *tofree_head) 942884d179dSJan Kara { 943884d179dSJan Kara struct dquot *dquot = inode->i_dquot[type]; 944884d179dSJan Kara 945dd6f3c6dSJan Kara inode->i_dquot[type] = NULL; 946dd6f3c6dSJan Kara if (dquot) { 947884d179dSJan Kara if (dqput_blocks(dquot)) { 94862af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 949884d179dSJan Kara if (atomic_read(&dquot->dq_count) != 1) 950884d179dSJan Kara printk(KERN_WARNING "VFS: Adding dquot with dq_count %d to dispose list.\n", atomic_read(&dquot->dq_count)); 951884d179dSJan Kara #endif 952884d179dSJan Kara spin_lock(&dq_list_lock); 953268157baSJan Kara /* As dquot must have currently users it can't be on 954268157baSJan Kara * the free list... */ 955268157baSJan Kara list_add(&dquot->dq_free, tofree_head); 956884d179dSJan Kara spin_unlock(&dq_list_lock); 957884d179dSJan Kara return 1; 958884d179dSJan Kara } 959884d179dSJan Kara else 960884d179dSJan Kara dqput(dquot); /* We have guaranteed we won't block */ 961884d179dSJan Kara } 962884d179dSJan Kara return 0; 963884d179dSJan Kara } 964884d179dSJan Kara 965268157baSJan Kara /* 966268157baSJan Kara * Free list of dquots 967268157baSJan Kara * Dquots are removed from inodes and no new references can be got so we are 968268157baSJan Kara * the only ones holding reference 969268157baSJan Kara */ 970884d179dSJan Kara static void put_dquot_list(struct list_head *tofree_head) 971884d179dSJan Kara { 972884d179dSJan Kara struct list_head *act_head; 973884d179dSJan Kara struct dquot *dquot; 974884d179dSJan Kara 975884d179dSJan Kara act_head = tofree_head->next; 976884d179dSJan Kara while (act_head != tofree_head) { 977884d179dSJan Kara dquot = list_entry(act_head, struct dquot, dq_free); 978884d179dSJan Kara act_head = act_head->next; 979268157baSJan Kara /* Remove dquot from the list so we won't have problems... */ 980268157baSJan Kara list_del_init(&dquot->dq_free); 981884d179dSJan Kara dqput(dquot); 982884d179dSJan Kara } 983884d179dSJan Kara } 984884d179dSJan Kara 985884d179dSJan Kara static void remove_dquot_ref(struct super_block *sb, int type, 986884d179dSJan Kara struct list_head *tofree_head) 987884d179dSJan Kara { 988884d179dSJan Kara struct inode *inode; 989884d179dSJan Kara 990884d179dSJan Kara spin_lock(&inode_lock); 991884d179dSJan Kara list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { 9923ae5080fSLinus Torvalds /* 9933ae5080fSLinus Torvalds * We have to scan also I_NEW inodes because they can already 9943ae5080fSLinus Torvalds * have quota pointer initialized. Luckily, we need to touch 9953ae5080fSLinus Torvalds * only quota pointers and these have separate locking 9963ae5080fSLinus Torvalds * (dqptr_sem). 9973ae5080fSLinus Torvalds */ 998884d179dSJan Kara if (!IS_NOQUOTA(inode)) 999884d179dSJan Kara remove_inode_dquot_ref(inode, type, tofree_head); 1000884d179dSJan Kara } 1001884d179dSJan Kara spin_unlock(&inode_lock); 1002884d179dSJan Kara } 1003884d179dSJan Kara 1004884d179dSJan Kara /* Gather all references from inodes and drop them */ 1005884d179dSJan Kara static void drop_dquot_ref(struct super_block *sb, int type) 1006884d179dSJan Kara { 1007884d179dSJan Kara LIST_HEAD(tofree_head); 1008884d179dSJan Kara 1009884d179dSJan Kara if (sb->dq_op) { 1010884d179dSJan Kara down_write(&sb_dqopt(sb)->dqptr_sem); 1011884d179dSJan Kara remove_dquot_ref(sb, type, &tofree_head); 1012884d179dSJan Kara up_write(&sb_dqopt(sb)->dqptr_sem); 1013884d179dSJan Kara put_dquot_list(&tofree_head); 1014884d179dSJan Kara } 1015884d179dSJan Kara } 1016884d179dSJan Kara 1017884d179dSJan Kara static inline void dquot_incr_inodes(struct dquot *dquot, qsize_t number) 1018884d179dSJan Kara { 1019884d179dSJan Kara dquot->dq_dqb.dqb_curinodes += number; 1020884d179dSJan Kara } 1021884d179dSJan Kara 1022884d179dSJan Kara static inline void dquot_incr_space(struct dquot *dquot, qsize_t number) 1023884d179dSJan Kara { 1024884d179dSJan Kara dquot->dq_dqb.dqb_curspace += number; 1025884d179dSJan Kara } 1026884d179dSJan Kara 1027884d179dSJan Kara static inline void dquot_resv_space(struct dquot *dquot, qsize_t number) 1028884d179dSJan Kara { 1029884d179dSJan Kara dquot->dq_dqb.dqb_rsvspace += number; 1030884d179dSJan Kara } 1031884d179dSJan Kara 1032884d179dSJan Kara /* 1033884d179dSJan Kara * Claim reserved quota space 1034884d179dSJan Kara */ 10350a5a9c72SJan Kara static void dquot_claim_reserved_space(struct dquot *dquot, qsize_t number) 1036884d179dSJan Kara { 10370a5a9c72SJan Kara if (dquot->dq_dqb.dqb_rsvspace < number) { 10380a5a9c72SJan Kara WARN_ON_ONCE(1); 10390a5a9c72SJan Kara number = dquot->dq_dqb.dqb_rsvspace; 10400a5a9c72SJan Kara } 1041884d179dSJan Kara dquot->dq_dqb.dqb_curspace += number; 1042884d179dSJan Kara dquot->dq_dqb.dqb_rsvspace -= number; 1043884d179dSJan Kara } 1044884d179dSJan Kara 1045884d179dSJan Kara static inline 1046884d179dSJan Kara void dquot_free_reserved_space(struct dquot *dquot, qsize_t number) 1047884d179dSJan Kara { 10480a5a9c72SJan Kara if (dquot->dq_dqb.dqb_rsvspace >= number) 1049884d179dSJan Kara dquot->dq_dqb.dqb_rsvspace -= number; 10500a5a9c72SJan Kara else { 10510a5a9c72SJan Kara WARN_ON_ONCE(1); 10520a5a9c72SJan Kara dquot->dq_dqb.dqb_rsvspace = 0; 10530a5a9c72SJan Kara } 1054884d179dSJan Kara } 1055884d179dSJan Kara 10567a2435d8SJan Kara static void dquot_decr_inodes(struct dquot *dquot, qsize_t number) 1057884d179dSJan Kara { 1058884d179dSJan Kara if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE || 1059884d179dSJan Kara dquot->dq_dqb.dqb_curinodes >= number) 1060884d179dSJan Kara dquot->dq_dqb.dqb_curinodes -= number; 1061884d179dSJan Kara else 1062884d179dSJan Kara dquot->dq_dqb.dqb_curinodes = 0; 1063884d179dSJan Kara if (dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit) 1064884d179dSJan Kara dquot->dq_dqb.dqb_itime = (time_t) 0; 1065884d179dSJan Kara clear_bit(DQ_INODES_B, &dquot->dq_flags); 1066884d179dSJan Kara } 1067884d179dSJan Kara 10687a2435d8SJan Kara static void dquot_decr_space(struct dquot *dquot, qsize_t number) 1069884d179dSJan Kara { 1070884d179dSJan Kara if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE || 1071884d179dSJan Kara dquot->dq_dqb.dqb_curspace >= number) 1072884d179dSJan Kara dquot->dq_dqb.dqb_curspace -= number; 1073884d179dSJan Kara else 1074884d179dSJan Kara dquot->dq_dqb.dqb_curspace = 0; 1075884d179dSJan Kara if (dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit) 1076884d179dSJan Kara dquot->dq_dqb.dqb_btime = (time_t) 0; 1077884d179dSJan Kara clear_bit(DQ_BLKS_B, &dquot->dq_flags); 1078884d179dSJan Kara } 1079884d179dSJan Kara 1080884d179dSJan Kara static int warning_issued(struct dquot *dquot, const int warntype) 1081884d179dSJan Kara { 1082884d179dSJan Kara int flag = (warntype == QUOTA_NL_BHARDWARN || 1083884d179dSJan Kara warntype == QUOTA_NL_BSOFTLONGWARN) ? DQ_BLKS_B : 1084884d179dSJan Kara ((warntype == QUOTA_NL_IHARDWARN || 1085884d179dSJan Kara warntype == QUOTA_NL_ISOFTLONGWARN) ? DQ_INODES_B : 0); 1086884d179dSJan Kara 1087884d179dSJan Kara if (!flag) 1088884d179dSJan Kara return 0; 1089884d179dSJan Kara return test_and_set_bit(flag, &dquot->dq_flags); 1090884d179dSJan Kara } 1091884d179dSJan Kara 1092884d179dSJan Kara #ifdef CONFIG_PRINT_QUOTA_WARNING 1093884d179dSJan Kara static int flag_print_warnings = 1; 1094884d179dSJan Kara 10957a2435d8SJan Kara static int need_print_warning(struct dquot *dquot) 1096884d179dSJan Kara { 1097884d179dSJan Kara if (!flag_print_warnings) 1098884d179dSJan Kara return 0; 1099884d179dSJan Kara 1100884d179dSJan Kara switch (dquot->dq_type) { 1101884d179dSJan Kara case USRQUOTA: 1102884d179dSJan Kara return current_fsuid() == dquot->dq_id; 1103884d179dSJan Kara case GRPQUOTA: 1104884d179dSJan Kara return in_group_p(dquot->dq_id); 1105884d179dSJan Kara } 1106884d179dSJan Kara return 0; 1107884d179dSJan Kara } 1108884d179dSJan Kara 1109884d179dSJan Kara /* Print warning to user which exceeded quota */ 1110884d179dSJan Kara static void print_warning(struct dquot *dquot, const int warntype) 1111884d179dSJan Kara { 1112884d179dSJan Kara char *msg = NULL; 1113884d179dSJan Kara struct tty_struct *tty; 1114884d179dSJan Kara 1115884d179dSJan Kara if (warntype == QUOTA_NL_IHARDBELOW || 1116884d179dSJan Kara warntype == QUOTA_NL_ISOFTBELOW || 1117884d179dSJan Kara warntype == QUOTA_NL_BHARDBELOW || 1118884d179dSJan Kara warntype == QUOTA_NL_BSOFTBELOW || !need_print_warning(dquot)) 1119884d179dSJan Kara return; 1120884d179dSJan Kara 1121884d179dSJan Kara tty = get_current_tty(); 1122884d179dSJan Kara if (!tty) 1123884d179dSJan Kara return; 1124884d179dSJan Kara tty_write_message(tty, dquot->dq_sb->s_id); 1125884d179dSJan Kara if (warntype == QUOTA_NL_ISOFTWARN || warntype == QUOTA_NL_BSOFTWARN) 1126884d179dSJan Kara tty_write_message(tty, ": warning, "); 1127884d179dSJan Kara else 1128884d179dSJan Kara tty_write_message(tty, ": write failed, "); 1129884d179dSJan Kara tty_write_message(tty, quotatypes[dquot->dq_type]); 1130884d179dSJan Kara switch (warntype) { 1131884d179dSJan Kara case QUOTA_NL_IHARDWARN: 1132884d179dSJan Kara msg = " file limit reached.\r\n"; 1133884d179dSJan Kara break; 1134884d179dSJan Kara case QUOTA_NL_ISOFTLONGWARN: 1135884d179dSJan Kara msg = " file quota exceeded too long.\r\n"; 1136884d179dSJan Kara break; 1137884d179dSJan Kara case QUOTA_NL_ISOFTWARN: 1138884d179dSJan Kara msg = " file quota exceeded.\r\n"; 1139884d179dSJan Kara break; 1140884d179dSJan Kara case QUOTA_NL_BHARDWARN: 1141884d179dSJan Kara msg = " block limit reached.\r\n"; 1142884d179dSJan Kara break; 1143884d179dSJan Kara case QUOTA_NL_BSOFTLONGWARN: 1144884d179dSJan Kara msg = " block quota exceeded too long.\r\n"; 1145884d179dSJan Kara break; 1146884d179dSJan Kara case QUOTA_NL_BSOFTWARN: 1147884d179dSJan Kara msg = " block quota exceeded.\r\n"; 1148884d179dSJan Kara break; 1149884d179dSJan Kara } 1150884d179dSJan Kara tty_write_message(tty, msg); 1151884d179dSJan Kara tty_kref_put(tty); 1152884d179dSJan Kara } 1153884d179dSJan Kara #endif 1154884d179dSJan Kara 1155884d179dSJan Kara /* 1156884d179dSJan Kara * Write warnings to the console and send warning messages over netlink. 1157884d179dSJan Kara * 1158884d179dSJan Kara * Note that this function can sleep. 1159884d179dSJan Kara */ 11607a2435d8SJan Kara static void flush_warnings(struct dquot *const *dquots, char *warntype) 1161884d179dSJan Kara { 116286e931a3SSteven Whitehouse struct dquot *dq; 1163884d179dSJan Kara int i; 1164884d179dSJan Kara 116586e931a3SSteven Whitehouse for (i = 0; i < MAXQUOTAS; i++) { 116686e931a3SSteven Whitehouse dq = dquots[i]; 116786e931a3SSteven Whitehouse if (dq && warntype[i] != QUOTA_NL_NOWARN && 116886e931a3SSteven Whitehouse !warning_issued(dq, warntype[i])) { 1169884d179dSJan Kara #ifdef CONFIG_PRINT_QUOTA_WARNING 117086e931a3SSteven Whitehouse print_warning(dq, warntype[i]); 1171884d179dSJan Kara #endif 117286e931a3SSteven Whitehouse quota_send_warning(dq->dq_type, dq->dq_id, 117386e931a3SSteven Whitehouse dq->dq_sb->s_dev, warntype[i]); 117486e931a3SSteven Whitehouse } 1175884d179dSJan Kara } 1176884d179dSJan Kara } 1177884d179dSJan Kara 11787a2435d8SJan Kara static int ignore_hardlimit(struct dquot *dquot) 1179884d179dSJan Kara { 1180884d179dSJan Kara struct mem_dqinfo *info = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_type]; 1181884d179dSJan Kara 1182884d179dSJan Kara return capable(CAP_SYS_RESOURCE) && 1183268157baSJan Kara (info->dqi_format->qf_fmt_id != QFMT_VFS_OLD || 1184268157baSJan Kara !(info->dqi_flags & V1_DQF_RSQUASH)); 1185884d179dSJan Kara } 1186884d179dSJan Kara 1187884d179dSJan Kara /* needs dq_data_lock */ 1188884d179dSJan Kara static int check_idq(struct dquot *dquot, qsize_t inodes, char *warntype) 1189884d179dSJan Kara { 1190268157baSJan Kara qsize_t newinodes = dquot->dq_dqb.dqb_curinodes + inodes; 1191268157baSJan Kara 1192884d179dSJan Kara *warntype = QUOTA_NL_NOWARN; 1193884d179dSJan Kara if (!sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_type) || 1194884d179dSJan Kara test_bit(DQ_FAKE_B, &dquot->dq_flags)) 1195efd8f0e6SChristoph Hellwig return 0; 1196884d179dSJan Kara 1197884d179dSJan Kara if (dquot->dq_dqb.dqb_ihardlimit && 1198268157baSJan Kara newinodes > dquot->dq_dqb.dqb_ihardlimit && 1199884d179dSJan Kara !ignore_hardlimit(dquot)) { 1200884d179dSJan Kara *warntype = QUOTA_NL_IHARDWARN; 1201efd8f0e6SChristoph Hellwig return -EDQUOT; 1202884d179dSJan Kara } 1203884d179dSJan Kara 1204884d179dSJan Kara if (dquot->dq_dqb.dqb_isoftlimit && 1205268157baSJan Kara newinodes > dquot->dq_dqb.dqb_isoftlimit && 1206268157baSJan Kara dquot->dq_dqb.dqb_itime && 1207268157baSJan Kara get_seconds() >= dquot->dq_dqb.dqb_itime && 1208884d179dSJan Kara !ignore_hardlimit(dquot)) { 1209884d179dSJan Kara *warntype = QUOTA_NL_ISOFTLONGWARN; 1210efd8f0e6SChristoph Hellwig return -EDQUOT; 1211884d179dSJan Kara } 1212884d179dSJan Kara 1213884d179dSJan Kara if (dquot->dq_dqb.dqb_isoftlimit && 1214268157baSJan Kara newinodes > dquot->dq_dqb.dqb_isoftlimit && 1215884d179dSJan Kara dquot->dq_dqb.dqb_itime == 0) { 1216884d179dSJan Kara *warntype = QUOTA_NL_ISOFTWARN; 1217268157baSJan Kara dquot->dq_dqb.dqb_itime = get_seconds() + 1218268157baSJan Kara sb_dqopt(dquot->dq_sb)->info[dquot->dq_type].dqi_igrace; 1219884d179dSJan Kara } 1220884d179dSJan Kara 1221efd8f0e6SChristoph Hellwig return 0; 1222884d179dSJan Kara } 1223884d179dSJan Kara 1224884d179dSJan Kara /* needs dq_data_lock */ 1225884d179dSJan Kara static int check_bdq(struct dquot *dquot, qsize_t space, int prealloc, char *warntype) 1226884d179dSJan Kara { 1227884d179dSJan Kara qsize_t tspace; 1228268157baSJan Kara struct super_block *sb = dquot->dq_sb; 1229884d179dSJan Kara 1230884d179dSJan Kara *warntype = QUOTA_NL_NOWARN; 1231268157baSJan Kara if (!sb_has_quota_limits_enabled(sb, dquot->dq_type) || 1232884d179dSJan Kara test_bit(DQ_FAKE_B, &dquot->dq_flags)) 1233efd8f0e6SChristoph Hellwig return 0; 1234884d179dSJan Kara 1235884d179dSJan Kara tspace = dquot->dq_dqb.dqb_curspace + dquot->dq_dqb.dqb_rsvspace 1236884d179dSJan Kara + space; 1237884d179dSJan Kara 1238884d179dSJan Kara if (dquot->dq_dqb.dqb_bhardlimit && 1239884d179dSJan Kara tspace > dquot->dq_dqb.dqb_bhardlimit && 1240884d179dSJan Kara !ignore_hardlimit(dquot)) { 1241884d179dSJan Kara if (!prealloc) 1242884d179dSJan Kara *warntype = QUOTA_NL_BHARDWARN; 1243efd8f0e6SChristoph Hellwig return -EDQUOT; 1244884d179dSJan Kara } 1245884d179dSJan Kara 1246884d179dSJan Kara if (dquot->dq_dqb.dqb_bsoftlimit && 1247884d179dSJan Kara tspace > dquot->dq_dqb.dqb_bsoftlimit && 1248268157baSJan Kara dquot->dq_dqb.dqb_btime && 1249268157baSJan Kara get_seconds() >= dquot->dq_dqb.dqb_btime && 1250884d179dSJan Kara !ignore_hardlimit(dquot)) { 1251884d179dSJan Kara if (!prealloc) 1252884d179dSJan Kara *warntype = QUOTA_NL_BSOFTLONGWARN; 1253efd8f0e6SChristoph Hellwig return -EDQUOT; 1254884d179dSJan Kara } 1255884d179dSJan Kara 1256884d179dSJan Kara if (dquot->dq_dqb.dqb_bsoftlimit && 1257884d179dSJan Kara tspace > dquot->dq_dqb.dqb_bsoftlimit && 1258884d179dSJan Kara dquot->dq_dqb.dqb_btime == 0) { 1259884d179dSJan Kara if (!prealloc) { 1260884d179dSJan Kara *warntype = QUOTA_NL_BSOFTWARN; 1261268157baSJan Kara dquot->dq_dqb.dqb_btime = get_seconds() + 1262268157baSJan Kara sb_dqopt(sb)->info[dquot->dq_type].dqi_bgrace; 1263884d179dSJan Kara } 1264884d179dSJan Kara else 1265884d179dSJan Kara /* 1266884d179dSJan Kara * We don't allow preallocation to exceed softlimit so exceeding will 1267884d179dSJan Kara * be always printed 1268884d179dSJan Kara */ 1269efd8f0e6SChristoph Hellwig return -EDQUOT; 1270884d179dSJan Kara } 1271884d179dSJan Kara 1272efd8f0e6SChristoph Hellwig return 0; 1273884d179dSJan Kara } 1274884d179dSJan Kara 1275884d179dSJan Kara static int info_idq_free(struct dquot *dquot, qsize_t inodes) 1276884d179dSJan Kara { 1277268157baSJan Kara qsize_t newinodes; 1278268157baSJan Kara 1279884d179dSJan Kara if (test_bit(DQ_FAKE_B, &dquot->dq_flags) || 1280884d179dSJan Kara dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit || 1281884d179dSJan Kara !sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_type)) 1282884d179dSJan Kara return QUOTA_NL_NOWARN; 1283884d179dSJan Kara 1284268157baSJan Kara newinodes = dquot->dq_dqb.dqb_curinodes - inodes; 1285268157baSJan Kara if (newinodes <= dquot->dq_dqb.dqb_isoftlimit) 1286884d179dSJan Kara return QUOTA_NL_ISOFTBELOW; 1287884d179dSJan Kara if (dquot->dq_dqb.dqb_curinodes >= dquot->dq_dqb.dqb_ihardlimit && 1288268157baSJan Kara newinodes < dquot->dq_dqb.dqb_ihardlimit) 1289884d179dSJan Kara return QUOTA_NL_IHARDBELOW; 1290884d179dSJan Kara return QUOTA_NL_NOWARN; 1291884d179dSJan Kara } 1292884d179dSJan Kara 1293884d179dSJan Kara static int info_bdq_free(struct dquot *dquot, qsize_t space) 1294884d179dSJan Kara { 1295884d179dSJan Kara if (test_bit(DQ_FAKE_B, &dquot->dq_flags) || 1296884d179dSJan Kara dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit) 1297884d179dSJan Kara return QUOTA_NL_NOWARN; 1298884d179dSJan Kara 1299884d179dSJan Kara if (dquot->dq_dqb.dqb_curspace - space <= dquot->dq_dqb.dqb_bsoftlimit) 1300884d179dSJan Kara return QUOTA_NL_BSOFTBELOW; 1301884d179dSJan Kara if (dquot->dq_dqb.dqb_curspace >= dquot->dq_dqb.dqb_bhardlimit && 1302884d179dSJan Kara dquot->dq_dqb.dqb_curspace - space < dquot->dq_dqb.dqb_bhardlimit) 1303884d179dSJan Kara return QUOTA_NL_BHARDBELOW; 1304884d179dSJan Kara return QUOTA_NL_NOWARN; 1305884d179dSJan Kara } 13060a5a9c72SJan Kara 1307884d179dSJan Kara /* 1308884d179dSJan Kara * Initialize quota pointers in inode 1309871a2931SChristoph Hellwig * 1310884d179dSJan Kara * We do things in a bit complicated way but by that we avoid calling 1311884d179dSJan Kara * dqget() and thus filesystem callbacks under dqptr_sem. 1312871a2931SChristoph Hellwig * 1313871a2931SChristoph Hellwig * It is better to call this function outside of any transaction as it 1314871a2931SChristoph Hellwig * might need a lot of space in journal for dquot structure allocation. 1315884d179dSJan Kara */ 1316871a2931SChristoph Hellwig static void __dquot_initialize(struct inode *inode, int type) 1317884d179dSJan Kara { 1318884d179dSJan Kara unsigned int id = 0; 1319871a2931SChristoph Hellwig int cnt; 1320ad1e6e8dSDmitry Monakhov struct dquot *got[MAXQUOTAS]; 1321884d179dSJan Kara struct super_block *sb = inode->i_sb; 13220a5a9c72SJan Kara qsize_t rsv; 1323884d179dSJan Kara 1324884d179dSJan Kara /* First test before acquiring mutex - solves deadlocks when we 1325884d179dSJan Kara * re-enter the quota code and are already holding the mutex */ 1326871a2931SChristoph Hellwig if (!sb_any_quota_active(inode->i_sb) || IS_NOQUOTA(inode)) 1327871a2931SChristoph Hellwig return; 1328884d179dSJan Kara 1329884d179dSJan Kara /* First get references to structures we might need. */ 1330884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1331ad1e6e8dSDmitry Monakhov got[cnt] = NULL; 1332884d179dSJan Kara if (type != -1 && cnt != type) 1333884d179dSJan Kara continue; 1334884d179dSJan Kara switch (cnt) { 1335884d179dSJan Kara case USRQUOTA: 1336884d179dSJan Kara id = inode->i_uid; 1337884d179dSJan Kara break; 1338884d179dSJan Kara case GRPQUOTA: 1339884d179dSJan Kara id = inode->i_gid; 1340884d179dSJan Kara break; 1341884d179dSJan Kara } 1342884d179dSJan Kara got[cnt] = dqget(sb, id, cnt); 1343884d179dSJan Kara } 1344884d179dSJan Kara 1345884d179dSJan Kara down_write(&sb_dqopt(sb)->dqptr_sem); 1346884d179dSJan Kara if (IS_NOQUOTA(inode)) 1347884d179dSJan Kara goto out_err; 1348884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1349884d179dSJan Kara if (type != -1 && cnt != type) 1350884d179dSJan Kara continue; 1351884d179dSJan Kara /* Avoid races with quotaoff() */ 1352884d179dSJan Kara if (!sb_has_quota_active(sb, cnt)) 1353884d179dSJan Kara continue; 1354dd6f3c6dSJan Kara if (!inode->i_dquot[cnt]) { 1355884d179dSJan Kara inode->i_dquot[cnt] = got[cnt]; 1356dd6f3c6dSJan Kara got[cnt] = NULL; 13570a5a9c72SJan Kara /* 13580a5a9c72SJan Kara * Make quota reservation system happy if someone 13590a5a9c72SJan Kara * did a write before quota was turned on 13600a5a9c72SJan Kara */ 13610a5a9c72SJan Kara rsv = inode_get_rsv_space(inode); 13620a5a9c72SJan Kara if (unlikely(rsv)) 13630a5a9c72SJan Kara dquot_resv_space(inode->i_dquot[cnt], rsv); 1364884d179dSJan Kara } 1365884d179dSJan Kara } 1366884d179dSJan Kara out_err: 1367884d179dSJan Kara up_write(&sb_dqopt(sb)->dqptr_sem); 1368884d179dSJan Kara /* Drop unused references */ 1369dc52dd3aSDmitry Monakhov dqput_all(got); 1370871a2931SChristoph Hellwig } 1371871a2931SChristoph Hellwig 1372871a2931SChristoph Hellwig void dquot_initialize(struct inode *inode) 1373871a2931SChristoph Hellwig { 1374871a2931SChristoph Hellwig __dquot_initialize(inode, -1); 1375884d179dSJan Kara } 1376884d179dSJan Kara EXPORT_SYMBOL(dquot_initialize); 1377884d179dSJan Kara 1378884d179dSJan Kara /* 1379884d179dSJan Kara * Release all quotas referenced by inode 1380884d179dSJan Kara */ 13819f754758SChristoph Hellwig static void __dquot_drop(struct inode *inode) 1382884d179dSJan Kara { 1383884d179dSJan Kara int cnt; 1384884d179dSJan Kara struct dquot *put[MAXQUOTAS]; 1385884d179dSJan Kara 1386884d179dSJan Kara down_write(&sb_dqopt(inode->i_sb)->dqptr_sem); 1387884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1388884d179dSJan Kara put[cnt] = inode->i_dquot[cnt]; 1389dd6f3c6dSJan Kara inode->i_dquot[cnt] = NULL; 1390884d179dSJan Kara } 1391884d179dSJan Kara up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); 1392dc52dd3aSDmitry Monakhov dqput_all(put); 1393884d179dSJan Kara } 1394884d179dSJan Kara 13959f754758SChristoph Hellwig void dquot_drop(struct inode *inode) 1396884d179dSJan Kara { 1397884d179dSJan Kara int cnt; 13989f754758SChristoph Hellwig 13999f754758SChristoph Hellwig if (IS_NOQUOTA(inode)) 14009f754758SChristoph Hellwig return; 14019f754758SChristoph Hellwig 14029f754758SChristoph Hellwig /* 14039f754758SChristoph Hellwig * Test before calling to rule out calls from proc and such 1404884d179dSJan Kara * where we are not allowed to block. Note that this is 1405884d179dSJan Kara * actually reliable test even without the lock - the caller 1406884d179dSJan Kara * must assure that nobody can come after the DQUOT_DROP and 14079f754758SChristoph Hellwig * add quota pointers back anyway. 14089f754758SChristoph Hellwig */ 14099f754758SChristoph Hellwig for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1410dd6f3c6dSJan Kara if (inode->i_dquot[cnt]) 1411884d179dSJan Kara break; 14129f754758SChristoph Hellwig } 14139f754758SChristoph Hellwig 1414884d179dSJan Kara if (cnt < MAXQUOTAS) 14159f754758SChristoph Hellwig __dquot_drop(inode); 1416884d179dSJan Kara } 14179f754758SChristoph Hellwig EXPORT_SYMBOL(dquot_drop); 1418884d179dSJan Kara 1419884d179dSJan Kara /* 1420fd8fbfc1SDmitry Monakhov * inode_reserved_space is managed internally by quota, and protected by 1421fd8fbfc1SDmitry Monakhov * i_lock similar to i_blocks+i_bytes. 1422fd8fbfc1SDmitry Monakhov */ 1423fd8fbfc1SDmitry Monakhov static qsize_t *inode_reserved_space(struct inode * inode) 1424fd8fbfc1SDmitry Monakhov { 1425fd8fbfc1SDmitry Monakhov /* Filesystem must explicitly define it's own method in order to use 1426fd8fbfc1SDmitry Monakhov * quota reservation interface */ 1427fd8fbfc1SDmitry Monakhov BUG_ON(!inode->i_sb->dq_op->get_reserved_space); 1428fd8fbfc1SDmitry Monakhov return inode->i_sb->dq_op->get_reserved_space(inode); 1429fd8fbfc1SDmitry Monakhov } 1430fd8fbfc1SDmitry Monakhov 1431c469070aSDmitry Monakhov void inode_add_rsv_space(struct inode *inode, qsize_t number) 1432fd8fbfc1SDmitry Monakhov { 1433fd8fbfc1SDmitry Monakhov spin_lock(&inode->i_lock); 1434fd8fbfc1SDmitry Monakhov *inode_reserved_space(inode) += number; 1435fd8fbfc1SDmitry Monakhov spin_unlock(&inode->i_lock); 1436fd8fbfc1SDmitry Monakhov } 1437c469070aSDmitry Monakhov EXPORT_SYMBOL(inode_add_rsv_space); 1438fd8fbfc1SDmitry Monakhov 1439c469070aSDmitry Monakhov void inode_claim_rsv_space(struct inode *inode, qsize_t number) 1440fd8fbfc1SDmitry Monakhov { 1441fd8fbfc1SDmitry Monakhov spin_lock(&inode->i_lock); 1442fd8fbfc1SDmitry Monakhov *inode_reserved_space(inode) -= number; 1443fd8fbfc1SDmitry Monakhov __inode_add_bytes(inode, number); 1444fd8fbfc1SDmitry Monakhov spin_unlock(&inode->i_lock); 1445fd8fbfc1SDmitry Monakhov } 1446c469070aSDmitry Monakhov EXPORT_SYMBOL(inode_claim_rsv_space); 1447fd8fbfc1SDmitry Monakhov 1448c469070aSDmitry Monakhov void inode_sub_rsv_space(struct inode *inode, qsize_t number) 1449fd8fbfc1SDmitry Monakhov { 1450fd8fbfc1SDmitry Monakhov spin_lock(&inode->i_lock); 1451fd8fbfc1SDmitry Monakhov *inode_reserved_space(inode) -= number; 1452fd8fbfc1SDmitry Monakhov spin_unlock(&inode->i_lock); 1453fd8fbfc1SDmitry Monakhov } 1454c469070aSDmitry Monakhov EXPORT_SYMBOL(inode_sub_rsv_space); 1455fd8fbfc1SDmitry Monakhov 1456fd8fbfc1SDmitry Monakhov static qsize_t inode_get_rsv_space(struct inode *inode) 1457fd8fbfc1SDmitry Monakhov { 1458fd8fbfc1SDmitry Monakhov qsize_t ret; 145905b5d898SJan Kara 146005b5d898SJan Kara if (!inode->i_sb->dq_op->get_reserved_space) 146105b5d898SJan Kara return 0; 1462fd8fbfc1SDmitry Monakhov spin_lock(&inode->i_lock); 1463fd8fbfc1SDmitry Monakhov ret = *inode_reserved_space(inode); 1464fd8fbfc1SDmitry Monakhov spin_unlock(&inode->i_lock); 1465fd8fbfc1SDmitry Monakhov return ret; 1466fd8fbfc1SDmitry Monakhov } 1467fd8fbfc1SDmitry Monakhov 1468fd8fbfc1SDmitry Monakhov static void inode_incr_space(struct inode *inode, qsize_t number, 1469fd8fbfc1SDmitry Monakhov int reserve) 1470fd8fbfc1SDmitry Monakhov { 1471fd8fbfc1SDmitry Monakhov if (reserve) 1472fd8fbfc1SDmitry Monakhov inode_add_rsv_space(inode, number); 1473fd8fbfc1SDmitry Monakhov else 1474fd8fbfc1SDmitry Monakhov inode_add_bytes(inode, number); 1475fd8fbfc1SDmitry Monakhov } 1476fd8fbfc1SDmitry Monakhov 1477fd8fbfc1SDmitry Monakhov static void inode_decr_space(struct inode *inode, qsize_t number, int reserve) 1478fd8fbfc1SDmitry Monakhov { 1479fd8fbfc1SDmitry Monakhov if (reserve) 1480fd8fbfc1SDmitry Monakhov inode_sub_rsv_space(inode, number); 1481fd8fbfc1SDmitry Monakhov else 1482fd8fbfc1SDmitry Monakhov inode_sub_bytes(inode, number); 1483fd8fbfc1SDmitry Monakhov } 1484fd8fbfc1SDmitry Monakhov 1485fd8fbfc1SDmitry Monakhov /* 14865dd4056dSChristoph Hellwig * This functions updates i_blocks+i_bytes fields and quota information 14875dd4056dSChristoph Hellwig * (together with appropriate checks). 14885dd4056dSChristoph Hellwig * 14895dd4056dSChristoph Hellwig * NOTE: We absolutely rely on the fact that caller dirties the inode 14905dd4056dSChristoph Hellwig * (usually helpers in quotaops.h care about this) and holds a handle for 14915dd4056dSChristoph Hellwig * the current transaction so that dquot write and inode write go into the 14925dd4056dSChristoph Hellwig * same transaction. 1493884d179dSJan Kara */ 1494884d179dSJan Kara 1495884d179dSJan Kara /* 1496884d179dSJan Kara * This operation can block, but only after everything is updated 1497884d179dSJan Kara */ 149856246f9aSEric Sandeen int __dquot_alloc_space(struct inode *inode, qsize_t number, int flags) 1499884d179dSJan Kara { 15005dd4056dSChristoph Hellwig int cnt, ret = 0; 1501884d179dSJan Kara char warntype[MAXQUOTAS]; 150256246f9aSEric Sandeen int warn = flags & DQUOT_SPACE_WARN; 150356246f9aSEric Sandeen int reserve = flags & DQUOT_SPACE_RESERVE; 15040e05842bSEric Sandeen int nofail = flags & DQUOT_SPACE_NOFAIL; 1505884d179dSJan Kara 1506fd8fbfc1SDmitry Monakhov /* 1507fd8fbfc1SDmitry Monakhov * First test before acquiring mutex - solves deadlocks when we 1508fd8fbfc1SDmitry Monakhov * re-enter the quota code and are already holding the mutex 1509fd8fbfc1SDmitry Monakhov */ 15105dd4056dSChristoph Hellwig if (!sb_any_quota_active(inode->i_sb) || IS_NOQUOTA(inode)) { 1511fd8fbfc1SDmitry Monakhov inode_incr_space(inode, number, reserve); 1512fd8fbfc1SDmitry Monakhov goto out; 1513fd8fbfc1SDmitry Monakhov } 1514fd8fbfc1SDmitry Monakhov 1515fd8fbfc1SDmitry Monakhov down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1516884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 1517884d179dSJan Kara warntype[cnt] = QUOTA_NL_NOWARN; 1518884d179dSJan Kara 1519884d179dSJan Kara spin_lock(&dq_data_lock); 1520884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1521dd6f3c6dSJan Kara if (!inode->i_dquot[cnt]) 1522884d179dSJan Kara continue; 1523efd8f0e6SChristoph Hellwig ret = check_bdq(inode->i_dquot[cnt], number, !warn, 1524efd8f0e6SChristoph Hellwig warntype+cnt); 15250e05842bSEric Sandeen if (ret && !nofail) { 1526fd8fbfc1SDmitry Monakhov spin_unlock(&dq_data_lock); 1527fd8fbfc1SDmitry Monakhov goto out_flush_warn; 1528884d179dSJan Kara } 1529884d179dSJan Kara } 1530884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1531dd6f3c6dSJan Kara if (!inode->i_dquot[cnt]) 1532884d179dSJan Kara continue; 1533884d179dSJan Kara if (reserve) 1534884d179dSJan Kara dquot_resv_space(inode->i_dquot[cnt], number); 1535884d179dSJan Kara else 1536884d179dSJan Kara dquot_incr_space(inode->i_dquot[cnt], number); 1537884d179dSJan Kara } 1538fd8fbfc1SDmitry Monakhov inode_incr_space(inode, number, reserve); 1539884d179dSJan Kara spin_unlock(&dq_data_lock); 1540fd8fbfc1SDmitry Monakhov 1541fd8fbfc1SDmitry Monakhov if (reserve) 1542fd8fbfc1SDmitry Monakhov goto out_flush_warn; 1543dc52dd3aSDmitry Monakhov mark_all_dquot_dirty(inode->i_dquot); 1544fd8fbfc1SDmitry Monakhov out_flush_warn: 1545884d179dSJan Kara flush_warnings(inode->i_dquot, warntype); 1546fd8fbfc1SDmitry Monakhov up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1547fd8fbfc1SDmitry Monakhov out: 1548884d179dSJan Kara return ret; 1549884d179dSJan Kara } 15505dd4056dSChristoph Hellwig EXPORT_SYMBOL(__dquot_alloc_space); 1551884d179dSJan Kara 1552884d179dSJan Kara /* 1553884d179dSJan Kara * This operation can block, but only after everything is updated 1554884d179dSJan Kara */ 155563936ddaSChristoph Hellwig int dquot_alloc_inode(const struct inode *inode) 1556884d179dSJan Kara { 1557efd8f0e6SChristoph Hellwig int cnt, ret = 0; 1558884d179dSJan Kara char warntype[MAXQUOTAS]; 1559884d179dSJan Kara 1560884d179dSJan Kara /* First test before acquiring mutex - solves deadlocks when we 1561884d179dSJan Kara * re-enter the quota code and are already holding the mutex */ 156263936ddaSChristoph Hellwig if (!sb_any_quota_active(inode->i_sb) || IS_NOQUOTA(inode)) 156363936ddaSChristoph Hellwig return 0; 1564884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 1565884d179dSJan Kara warntype[cnt] = QUOTA_NL_NOWARN; 1566884d179dSJan Kara down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1567884d179dSJan Kara spin_lock(&dq_data_lock); 1568884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1569dd6f3c6dSJan Kara if (!inode->i_dquot[cnt]) 1570884d179dSJan Kara continue; 1571efd8f0e6SChristoph Hellwig ret = check_idq(inode->i_dquot[cnt], 1, warntype + cnt); 1572efd8f0e6SChristoph Hellwig if (ret) 1573884d179dSJan Kara goto warn_put_all; 1574884d179dSJan Kara } 1575884d179dSJan Kara 1576884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1577dd6f3c6dSJan Kara if (!inode->i_dquot[cnt]) 1578884d179dSJan Kara continue; 157963936ddaSChristoph Hellwig dquot_incr_inodes(inode->i_dquot[cnt], 1); 1580884d179dSJan Kara } 1581efd8f0e6SChristoph Hellwig 1582884d179dSJan Kara warn_put_all: 1583884d179dSJan Kara spin_unlock(&dq_data_lock); 158463936ddaSChristoph Hellwig if (ret == 0) 1585dc52dd3aSDmitry Monakhov mark_all_dquot_dirty(inode->i_dquot); 1586884d179dSJan Kara flush_warnings(inode->i_dquot, warntype); 1587884d179dSJan Kara up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1588884d179dSJan Kara return ret; 1589884d179dSJan Kara } 1590884d179dSJan Kara EXPORT_SYMBOL(dquot_alloc_inode); 1591884d179dSJan Kara 15925dd4056dSChristoph Hellwig /* 15935dd4056dSChristoph Hellwig * Convert in-memory reserved quotas to real consumed quotas 15945dd4056dSChristoph Hellwig */ 15955dd4056dSChristoph Hellwig int dquot_claim_space_nodirty(struct inode *inode, qsize_t number) 1596884d179dSJan Kara { 1597884d179dSJan Kara int cnt; 1598884d179dSJan Kara 15995dd4056dSChristoph Hellwig if (!sb_any_quota_active(inode->i_sb) || IS_NOQUOTA(inode)) { 1600fd8fbfc1SDmitry Monakhov inode_claim_rsv_space(inode, number); 16015dd4056dSChristoph Hellwig return 0; 1602884d179dSJan Kara } 1603884d179dSJan Kara 1604884d179dSJan Kara down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1605884d179dSJan Kara spin_lock(&dq_data_lock); 1606884d179dSJan Kara /* Claim reserved quotas to allocated quotas */ 1607884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1608dd6f3c6dSJan Kara if (inode->i_dquot[cnt]) 1609884d179dSJan Kara dquot_claim_reserved_space(inode->i_dquot[cnt], 1610884d179dSJan Kara number); 1611884d179dSJan Kara } 1612884d179dSJan Kara /* Update inode bytes */ 1613fd8fbfc1SDmitry Monakhov inode_claim_rsv_space(inode, number); 1614884d179dSJan Kara spin_unlock(&dq_data_lock); 1615dc52dd3aSDmitry Monakhov mark_all_dquot_dirty(inode->i_dquot); 1616884d179dSJan Kara up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 16175dd4056dSChristoph Hellwig return 0; 1618884d179dSJan Kara } 16195dd4056dSChristoph Hellwig EXPORT_SYMBOL(dquot_claim_space_nodirty); 1620884d179dSJan Kara 1621884d179dSJan Kara /* 1622884d179dSJan Kara * This operation can block, but only after everything is updated 1623884d179dSJan Kara */ 162456246f9aSEric Sandeen void __dquot_free_space(struct inode *inode, qsize_t number, int flags) 1625884d179dSJan Kara { 1626884d179dSJan Kara unsigned int cnt; 1627884d179dSJan Kara char warntype[MAXQUOTAS]; 162856246f9aSEric Sandeen int reserve = flags & DQUOT_SPACE_RESERVE; 1629884d179dSJan Kara 1630884d179dSJan Kara /* First test before acquiring mutex - solves deadlocks when we 1631884d179dSJan Kara * re-enter the quota code and are already holding the mutex */ 16325dd4056dSChristoph Hellwig if (!sb_any_quota_active(inode->i_sb) || IS_NOQUOTA(inode)) { 1633fd8fbfc1SDmitry Monakhov inode_decr_space(inode, number, reserve); 16345dd4056dSChristoph Hellwig return; 1635884d179dSJan Kara } 1636884d179dSJan Kara 1637884d179dSJan Kara down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1638884d179dSJan Kara spin_lock(&dq_data_lock); 1639884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1640dd6f3c6dSJan Kara if (!inode->i_dquot[cnt]) 1641884d179dSJan Kara continue; 1642884d179dSJan Kara warntype[cnt] = info_bdq_free(inode->i_dquot[cnt], number); 1643fd8fbfc1SDmitry Monakhov if (reserve) 1644fd8fbfc1SDmitry Monakhov dquot_free_reserved_space(inode->i_dquot[cnt], number); 1645fd8fbfc1SDmitry Monakhov else 1646884d179dSJan Kara dquot_decr_space(inode->i_dquot[cnt], number); 1647884d179dSJan Kara } 1648fd8fbfc1SDmitry Monakhov inode_decr_space(inode, number, reserve); 1649884d179dSJan Kara spin_unlock(&dq_data_lock); 1650fd8fbfc1SDmitry Monakhov 1651fd8fbfc1SDmitry Monakhov if (reserve) 1652fd8fbfc1SDmitry Monakhov goto out_unlock; 1653dc52dd3aSDmitry Monakhov mark_all_dquot_dirty(inode->i_dquot); 1654fd8fbfc1SDmitry Monakhov out_unlock: 1655884d179dSJan Kara flush_warnings(inode->i_dquot, warntype); 1656884d179dSJan Kara up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1657884d179dSJan Kara } 16585dd4056dSChristoph Hellwig EXPORT_SYMBOL(__dquot_free_space); 1659fd8fbfc1SDmitry Monakhov 1660fd8fbfc1SDmitry Monakhov /* 1661884d179dSJan Kara * This operation can block, but only after everything is updated 1662884d179dSJan Kara */ 166363936ddaSChristoph Hellwig void dquot_free_inode(const struct inode *inode) 1664884d179dSJan Kara { 1665884d179dSJan Kara unsigned int cnt; 1666884d179dSJan Kara char warntype[MAXQUOTAS]; 1667884d179dSJan Kara 1668884d179dSJan Kara /* First test before acquiring mutex - solves deadlocks when we 1669884d179dSJan Kara * re-enter the quota code and are already holding the mutex */ 167063936ddaSChristoph Hellwig if (!sb_any_quota_active(inode->i_sb) || IS_NOQUOTA(inode)) 167163936ddaSChristoph Hellwig return; 1672884d179dSJan Kara 1673884d179dSJan Kara down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1674884d179dSJan Kara spin_lock(&dq_data_lock); 1675884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1676dd6f3c6dSJan Kara if (!inode->i_dquot[cnt]) 1677884d179dSJan Kara continue; 167863936ddaSChristoph Hellwig warntype[cnt] = info_idq_free(inode->i_dquot[cnt], 1); 167963936ddaSChristoph Hellwig dquot_decr_inodes(inode->i_dquot[cnt], 1); 1680884d179dSJan Kara } 1681884d179dSJan Kara spin_unlock(&dq_data_lock); 1682dc52dd3aSDmitry Monakhov mark_all_dquot_dirty(inode->i_dquot); 1683884d179dSJan Kara flush_warnings(inode->i_dquot, warntype); 1684884d179dSJan Kara up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1685884d179dSJan Kara } 1686884d179dSJan Kara EXPORT_SYMBOL(dquot_free_inode); 1687884d179dSJan Kara 1688884d179dSJan Kara /* 1689884d179dSJan Kara * Transfer the number of inode and blocks from one diskquota to an other. 1690bc8e5f07SJan Kara * On success, dquot references in transfer_to are consumed and references 1691bc8e5f07SJan Kara * to original dquots that need to be released are placed there. On failure, 1692bc8e5f07SJan Kara * references are kept untouched. 1693884d179dSJan Kara * 1694884d179dSJan Kara * This operation can block, but only after everything is updated 1695884d179dSJan Kara * A transaction must be started when entering this function. 1696bc8e5f07SJan Kara * 1697884d179dSJan Kara */ 1698bc8e5f07SJan Kara int __dquot_transfer(struct inode *inode, struct dquot **transfer_to) 1699884d179dSJan Kara { 1700884d179dSJan Kara qsize_t space, cur_space; 1701884d179dSJan Kara qsize_t rsv_space = 0; 1702bc8e5f07SJan Kara struct dquot *transfer_from[MAXQUOTAS] = {}; 1703efd8f0e6SChristoph Hellwig int cnt, ret = 0; 1704884d179dSJan Kara char warntype_to[MAXQUOTAS]; 1705884d179dSJan Kara char warntype_from_inodes[MAXQUOTAS], warntype_from_space[MAXQUOTAS]; 1706884d179dSJan Kara 1707884d179dSJan Kara /* First test before acquiring mutex - solves deadlocks when we 1708884d179dSJan Kara * re-enter the quota code and are already holding the mutex */ 1709884d179dSJan Kara if (IS_NOQUOTA(inode)) 1710efd8f0e6SChristoph Hellwig return 0; 1711884d179dSJan Kara /* Initialize the arrays */ 1712bc8e5f07SJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 1713884d179dSJan Kara warntype_to[cnt] = QUOTA_NL_NOWARN; 1714884d179dSJan Kara down_write(&sb_dqopt(inode->i_sb)->dqptr_sem); 1715884d179dSJan Kara if (IS_NOQUOTA(inode)) { /* File without quota accounting? */ 1716884d179dSJan Kara up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); 1717bc8e5f07SJan Kara return 0; 1718884d179dSJan Kara } 1719884d179dSJan Kara spin_lock(&dq_data_lock); 1720884d179dSJan Kara cur_space = inode_get_bytes(inode); 1721fd8fbfc1SDmitry Monakhov rsv_space = inode_get_rsv_space(inode); 1722884d179dSJan Kara space = cur_space + rsv_space; 1723884d179dSJan Kara /* Build the transfer_from list and check the limits */ 1724884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1725dd6f3c6dSJan Kara if (!transfer_to[cnt]) 1726884d179dSJan Kara continue; 1727884d179dSJan Kara transfer_from[cnt] = inode->i_dquot[cnt]; 1728efd8f0e6SChristoph Hellwig ret = check_idq(transfer_to[cnt], 1, warntype_to + cnt); 1729efd8f0e6SChristoph Hellwig if (ret) 1730efd8f0e6SChristoph Hellwig goto over_quota; 1731efd8f0e6SChristoph Hellwig ret = check_bdq(transfer_to[cnt], space, 0, warntype_to + cnt); 1732efd8f0e6SChristoph Hellwig if (ret) 1733884d179dSJan Kara goto over_quota; 1734884d179dSJan Kara } 1735884d179dSJan Kara 1736884d179dSJan Kara /* 1737884d179dSJan Kara * Finally perform the needed transfer from transfer_from to transfer_to 1738884d179dSJan Kara */ 1739884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1740884d179dSJan Kara /* 1741884d179dSJan Kara * Skip changes for same uid or gid or for turned off quota-type. 1742884d179dSJan Kara */ 1743dd6f3c6dSJan Kara if (!transfer_to[cnt]) 1744884d179dSJan Kara continue; 1745884d179dSJan Kara 1746884d179dSJan Kara /* Due to IO error we might not have transfer_from[] structure */ 1747884d179dSJan Kara if (transfer_from[cnt]) { 1748884d179dSJan Kara warntype_from_inodes[cnt] = 1749884d179dSJan Kara info_idq_free(transfer_from[cnt], 1); 1750884d179dSJan Kara warntype_from_space[cnt] = 1751884d179dSJan Kara info_bdq_free(transfer_from[cnt], space); 1752884d179dSJan Kara dquot_decr_inodes(transfer_from[cnt], 1); 1753884d179dSJan Kara dquot_decr_space(transfer_from[cnt], cur_space); 1754884d179dSJan Kara dquot_free_reserved_space(transfer_from[cnt], 1755884d179dSJan Kara rsv_space); 1756884d179dSJan Kara } 1757884d179dSJan Kara 1758884d179dSJan Kara dquot_incr_inodes(transfer_to[cnt], 1); 1759884d179dSJan Kara dquot_incr_space(transfer_to[cnt], cur_space); 1760884d179dSJan Kara dquot_resv_space(transfer_to[cnt], rsv_space); 1761884d179dSJan Kara 1762884d179dSJan Kara inode->i_dquot[cnt] = transfer_to[cnt]; 1763884d179dSJan Kara } 1764884d179dSJan Kara spin_unlock(&dq_data_lock); 1765884d179dSJan Kara up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); 1766884d179dSJan Kara 1767dc52dd3aSDmitry Monakhov mark_all_dquot_dirty(transfer_from); 1768dc52dd3aSDmitry Monakhov mark_all_dquot_dirty(transfer_to); 1769bc8e5f07SJan Kara /* Pass back references to put */ 1770dc52dd3aSDmitry Monakhov for (cnt = 0; cnt < MAXQUOTAS; cnt++) 1771bc8e5f07SJan Kara transfer_to[cnt] = transfer_from[cnt]; 1772bc8e5f07SJan Kara warn: 1773884d179dSJan Kara flush_warnings(transfer_to, warntype_to); 1774884d179dSJan Kara flush_warnings(transfer_from, warntype_from_inodes); 1775884d179dSJan Kara flush_warnings(transfer_from, warntype_from_space); 1776884d179dSJan Kara return ret; 1777884d179dSJan Kara over_quota: 1778884d179dSJan Kara spin_unlock(&dq_data_lock); 1779884d179dSJan Kara up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); 1780bc8e5f07SJan Kara goto warn; 1781884d179dSJan Kara } 1782bc8e5f07SJan Kara EXPORT_SYMBOL(__dquot_transfer); 1783884d179dSJan Kara 17848ddd69d6SDmitry Monakhov /* Wrapper for transferring ownership of an inode for uid/gid only 17858ddd69d6SDmitry Monakhov * Called from FSXXX_setattr() 17868ddd69d6SDmitry Monakhov */ 1787b43fa828SChristoph Hellwig int dquot_transfer(struct inode *inode, struct iattr *iattr) 1788884d179dSJan Kara { 1789bc8e5f07SJan Kara struct dquot *transfer_to[MAXQUOTAS] = {}; 1790bc8e5f07SJan Kara struct super_block *sb = inode->i_sb; 1791bc8e5f07SJan Kara int ret; 17928ddd69d6SDmitry Monakhov 1793bc8e5f07SJan Kara if (!sb_any_quota_active(sb) || IS_NOQUOTA(inode)) 1794884d179dSJan Kara return 0; 1795bc8e5f07SJan Kara 1796bc8e5f07SJan Kara if (iattr->ia_valid & ATTR_UID && iattr->ia_uid != inode->i_uid) 1797bc8e5f07SJan Kara transfer_to[USRQUOTA] = dqget(sb, iattr->ia_uid, USRQUOTA); 1798bc8e5f07SJan Kara if (iattr->ia_valid & ATTR_GID && iattr->ia_gid != inode->i_gid) 17994dea4969SJan Kara transfer_to[GRPQUOTA] = dqget(sb, iattr->ia_gid, GRPQUOTA); 1800bc8e5f07SJan Kara 1801bc8e5f07SJan Kara ret = __dquot_transfer(inode, transfer_to); 1802bc8e5f07SJan Kara dqput_all(transfer_to); 1803bc8e5f07SJan Kara return ret; 1804884d179dSJan Kara } 1805b43fa828SChristoph Hellwig EXPORT_SYMBOL(dquot_transfer); 1806884d179dSJan Kara 1807884d179dSJan Kara /* 1808884d179dSJan Kara * Write info of quota file to disk 1809884d179dSJan Kara */ 1810884d179dSJan Kara int dquot_commit_info(struct super_block *sb, int type) 1811884d179dSJan Kara { 1812884d179dSJan Kara int ret; 1813884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 1814884d179dSJan Kara 1815884d179dSJan Kara mutex_lock(&dqopt->dqio_mutex); 1816884d179dSJan Kara ret = dqopt->ops[type]->write_file_info(sb, type); 1817884d179dSJan Kara mutex_unlock(&dqopt->dqio_mutex); 1818884d179dSJan Kara return ret; 1819884d179dSJan Kara } 1820884d179dSJan Kara EXPORT_SYMBOL(dquot_commit_info); 1821884d179dSJan Kara 1822884d179dSJan Kara /* 1823884d179dSJan Kara * Definitions of diskquota operations. 1824884d179dSJan Kara */ 182561e225dcSAlexey Dobriyan const struct dquot_operations dquot_operations = { 1826884d179dSJan Kara .write_dquot = dquot_commit, 1827884d179dSJan Kara .acquire_dquot = dquot_acquire, 1828884d179dSJan Kara .release_dquot = dquot_release, 1829884d179dSJan Kara .mark_dirty = dquot_mark_dquot_dirty, 1830884d179dSJan Kara .write_info = dquot_commit_info, 1831884d179dSJan Kara .alloc_dquot = dquot_alloc, 1832884d179dSJan Kara .destroy_dquot = dquot_destroy, 1833884d179dSJan Kara }; 1834123e9cafSChristoph Hellwig EXPORT_SYMBOL(dquot_operations); 1835884d179dSJan Kara 1836884d179dSJan Kara /* 1837907f4554SChristoph Hellwig * Generic helper for ->open on filesystems supporting disk quotas. 1838907f4554SChristoph Hellwig */ 1839907f4554SChristoph Hellwig int dquot_file_open(struct inode *inode, struct file *file) 1840907f4554SChristoph Hellwig { 1841907f4554SChristoph Hellwig int error; 1842907f4554SChristoph Hellwig 1843907f4554SChristoph Hellwig error = generic_file_open(inode, file); 1844907f4554SChristoph Hellwig if (!error && (file->f_mode & FMODE_WRITE)) 1845871a2931SChristoph Hellwig dquot_initialize(inode); 1846907f4554SChristoph Hellwig return error; 1847907f4554SChristoph Hellwig } 1848907f4554SChristoph Hellwig EXPORT_SYMBOL(dquot_file_open); 1849907f4554SChristoph Hellwig 1850907f4554SChristoph Hellwig /* 1851884d179dSJan Kara * Turn quota off on a device. type == -1 ==> quotaoff for all types (umount) 1852884d179dSJan Kara */ 18530f0dd62fSChristoph Hellwig int dquot_disable(struct super_block *sb, int type, unsigned int flags) 1854884d179dSJan Kara { 1855884d179dSJan Kara int cnt, ret = 0; 1856884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 1857884d179dSJan Kara struct inode *toputinode[MAXQUOTAS]; 1858884d179dSJan Kara 1859884d179dSJan Kara /* Cannot turn off usage accounting without turning off limits, or 1860884d179dSJan Kara * suspend quotas and simultaneously turn quotas off. */ 1861884d179dSJan Kara if ((flags & DQUOT_USAGE_ENABLED && !(flags & DQUOT_LIMITS_ENABLED)) 1862884d179dSJan Kara || (flags & DQUOT_SUSPENDED && flags & (DQUOT_LIMITS_ENABLED | 1863884d179dSJan Kara DQUOT_USAGE_ENABLED))) 1864884d179dSJan Kara return -EINVAL; 1865884d179dSJan Kara 1866884d179dSJan Kara /* We need to serialize quota_off() for device */ 1867884d179dSJan Kara mutex_lock(&dqopt->dqonoff_mutex); 1868884d179dSJan Kara 1869884d179dSJan Kara /* 1870884d179dSJan Kara * Skip everything if there's nothing to do. We have to do this because 1871884d179dSJan Kara * sometimes we are called when fill_super() failed and calling 1872884d179dSJan Kara * sync_fs() in such cases does no good. 1873884d179dSJan Kara */ 1874884d179dSJan Kara if (!sb_any_quota_loaded(sb)) { 1875884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 1876884d179dSJan Kara return 0; 1877884d179dSJan Kara } 1878884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1879884d179dSJan Kara toputinode[cnt] = NULL; 1880884d179dSJan Kara if (type != -1 && cnt != type) 1881884d179dSJan Kara continue; 1882884d179dSJan Kara if (!sb_has_quota_loaded(sb, cnt)) 1883884d179dSJan Kara continue; 1884884d179dSJan Kara 1885884d179dSJan Kara if (flags & DQUOT_SUSPENDED) { 1886884d179dSJan Kara spin_lock(&dq_state_lock); 1887884d179dSJan Kara dqopt->flags |= 1888884d179dSJan Kara dquot_state_flag(DQUOT_SUSPENDED, cnt); 1889884d179dSJan Kara spin_unlock(&dq_state_lock); 1890884d179dSJan Kara } else { 1891884d179dSJan Kara spin_lock(&dq_state_lock); 1892884d179dSJan Kara dqopt->flags &= ~dquot_state_flag(flags, cnt); 1893884d179dSJan Kara /* Turning off suspended quotas? */ 1894884d179dSJan Kara if (!sb_has_quota_loaded(sb, cnt) && 1895884d179dSJan Kara sb_has_quota_suspended(sb, cnt)) { 1896884d179dSJan Kara dqopt->flags &= ~dquot_state_flag( 1897884d179dSJan Kara DQUOT_SUSPENDED, cnt); 1898884d179dSJan Kara spin_unlock(&dq_state_lock); 1899884d179dSJan Kara iput(dqopt->files[cnt]); 1900884d179dSJan Kara dqopt->files[cnt] = NULL; 1901884d179dSJan Kara continue; 1902884d179dSJan Kara } 1903884d179dSJan Kara spin_unlock(&dq_state_lock); 1904884d179dSJan Kara } 1905884d179dSJan Kara 1906884d179dSJan Kara /* We still have to keep quota loaded? */ 1907884d179dSJan Kara if (sb_has_quota_loaded(sb, cnt) && !(flags & DQUOT_SUSPENDED)) 1908884d179dSJan Kara continue; 1909884d179dSJan Kara 1910884d179dSJan Kara /* Note: these are blocking operations */ 1911884d179dSJan Kara drop_dquot_ref(sb, cnt); 1912884d179dSJan Kara invalidate_dquots(sb, cnt); 1913884d179dSJan Kara /* 1914268157baSJan Kara * Now all dquots should be invalidated, all writes done so we 1915268157baSJan Kara * should be only users of the info. No locks needed. 1916884d179dSJan Kara */ 1917884d179dSJan Kara if (info_dirty(&dqopt->info[cnt])) 1918884d179dSJan Kara sb->dq_op->write_info(sb, cnt); 1919884d179dSJan Kara if (dqopt->ops[cnt]->free_file_info) 1920884d179dSJan Kara dqopt->ops[cnt]->free_file_info(sb, cnt); 1921884d179dSJan Kara put_quota_format(dqopt->info[cnt].dqi_format); 1922884d179dSJan Kara 1923884d179dSJan Kara toputinode[cnt] = dqopt->files[cnt]; 1924884d179dSJan Kara if (!sb_has_quota_loaded(sb, cnt)) 1925884d179dSJan Kara dqopt->files[cnt] = NULL; 1926884d179dSJan Kara dqopt->info[cnt].dqi_flags = 0; 1927884d179dSJan Kara dqopt->info[cnt].dqi_igrace = 0; 1928884d179dSJan Kara dqopt->info[cnt].dqi_bgrace = 0; 1929884d179dSJan Kara dqopt->ops[cnt] = NULL; 1930884d179dSJan Kara } 1931884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 1932884d179dSJan Kara 1933884d179dSJan Kara /* Skip syncing and setting flags if quota files are hidden */ 1934884d179dSJan Kara if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) 1935884d179dSJan Kara goto put_inodes; 1936884d179dSJan Kara 1937884d179dSJan Kara /* Sync the superblock so that buffers with quota data are written to 1938884d179dSJan Kara * disk (and so userspace sees correct data afterwards). */ 1939884d179dSJan Kara if (sb->s_op->sync_fs) 1940884d179dSJan Kara sb->s_op->sync_fs(sb, 1); 1941884d179dSJan Kara sync_blockdev(sb->s_bdev); 1942884d179dSJan Kara /* Now the quota files are just ordinary files and we can set the 1943884d179dSJan Kara * inode flags back. Moreover we discard the pagecache so that 1944884d179dSJan Kara * userspace sees the writes we did bypassing the pagecache. We 1945884d179dSJan Kara * must also discard the blockdev buffers so that we see the 1946884d179dSJan Kara * changes done by userspace on the next quotaon() */ 1947884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 1948884d179dSJan Kara if (toputinode[cnt]) { 1949884d179dSJan Kara mutex_lock(&dqopt->dqonoff_mutex); 1950884d179dSJan Kara /* If quota was reenabled in the meantime, we have 1951884d179dSJan Kara * nothing to do */ 1952884d179dSJan Kara if (!sb_has_quota_loaded(sb, cnt)) { 1953268157baSJan Kara mutex_lock_nested(&toputinode[cnt]->i_mutex, 1954268157baSJan Kara I_MUTEX_QUOTA); 1955884d179dSJan Kara toputinode[cnt]->i_flags &= ~(S_IMMUTABLE | 1956884d179dSJan Kara S_NOATIME | S_NOQUOTA); 1957268157baSJan Kara truncate_inode_pages(&toputinode[cnt]->i_data, 1958268157baSJan Kara 0); 1959884d179dSJan Kara mutex_unlock(&toputinode[cnt]->i_mutex); 1960884d179dSJan Kara mark_inode_dirty(toputinode[cnt]); 1961884d179dSJan Kara } 1962884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 1963884d179dSJan Kara } 1964884d179dSJan Kara if (sb->s_bdev) 1965884d179dSJan Kara invalidate_bdev(sb->s_bdev); 1966884d179dSJan Kara put_inodes: 1967884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 1968884d179dSJan Kara if (toputinode[cnt]) { 1969884d179dSJan Kara /* On remount RO, we keep the inode pointer so that we 1970884d179dSJan Kara * can reenable quota on the subsequent remount RW. We 1971884d179dSJan Kara * have to check 'flags' variable and not use sb_has_ 1972884d179dSJan Kara * function because another quotaon / quotaoff could 1973884d179dSJan Kara * change global state before we got here. We refuse 1974884d179dSJan Kara * to suspend quotas when there is pending delete on 1975884d179dSJan Kara * the quota file... */ 1976884d179dSJan Kara if (!(flags & DQUOT_SUSPENDED)) 1977884d179dSJan Kara iput(toputinode[cnt]); 1978884d179dSJan Kara else if (!toputinode[cnt]->i_nlink) 1979884d179dSJan Kara ret = -EBUSY; 1980884d179dSJan Kara } 1981884d179dSJan Kara return ret; 1982884d179dSJan Kara } 19830f0dd62fSChristoph Hellwig EXPORT_SYMBOL(dquot_disable); 1984884d179dSJan Kara 1985287a8095SChristoph Hellwig int dquot_quota_off(struct super_block *sb, int type) 1986884d179dSJan Kara { 19870f0dd62fSChristoph Hellwig return dquot_disable(sb, type, 19880f0dd62fSChristoph Hellwig DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); 1989884d179dSJan Kara } 1990287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_quota_off); 19910f0dd62fSChristoph Hellwig 1992884d179dSJan Kara /* 1993884d179dSJan Kara * Turn quotas on on a device 1994884d179dSJan Kara */ 1995884d179dSJan Kara 1996884d179dSJan Kara /* 1997884d179dSJan Kara * Helper function to turn quotas on when we already have the inode of 1998884d179dSJan Kara * quota file and no quota information is loaded. 1999884d179dSJan Kara */ 2000884d179dSJan Kara static int vfs_load_quota_inode(struct inode *inode, int type, int format_id, 2001884d179dSJan Kara unsigned int flags) 2002884d179dSJan Kara { 2003884d179dSJan Kara struct quota_format_type *fmt = find_quota_format(format_id); 2004884d179dSJan Kara struct super_block *sb = inode->i_sb; 2005884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 2006884d179dSJan Kara int error; 2007884d179dSJan Kara int oldflags = -1; 2008884d179dSJan Kara 2009884d179dSJan Kara if (!fmt) 2010884d179dSJan Kara return -ESRCH; 2011884d179dSJan Kara if (!S_ISREG(inode->i_mode)) { 2012884d179dSJan Kara error = -EACCES; 2013884d179dSJan Kara goto out_fmt; 2014884d179dSJan Kara } 2015884d179dSJan Kara if (IS_RDONLY(inode)) { 2016884d179dSJan Kara error = -EROFS; 2017884d179dSJan Kara goto out_fmt; 2018884d179dSJan Kara } 2019884d179dSJan Kara if (!sb->s_op->quota_write || !sb->s_op->quota_read) { 2020884d179dSJan Kara error = -EINVAL; 2021884d179dSJan Kara goto out_fmt; 2022884d179dSJan Kara } 2023884d179dSJan Kara /* Usage always has to be set... */ 2024884d179dSJan Kara if (!(flags & DQUOT_USAGE_ENABLED)) { 2025884d179dSJan Kara error = -EINVAL; 2026884d179dSJan Kara goto out_fmt; 2027884d179dSJan Kara } 2028884d179dSJan Kara 2029884d179dSJan Kara if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) { 2030ab94c39bSJan Kara /* As we bypass the pagecache we must now flush all the 2031ab94c39bSJan Kara * dirty data and invalidate caches so that kernel sees 2032ab94c39bSJan Kara * changes from userspace. It is not enough to just flush 2033ab94c39bSJan Kara * the quota file since if blocksize < pagesize, invalidation 2034ab94c39bSJan Kara * of the cache could fail because of other unrelated dirty 2035ab94c39bSJan Kara * data */ 2036ab94c39bSJan Kara sync_filesystem(sb); 2037884d179dSJan Kara invalidate_bdev(sb->s_bdev); 2038884d179dSJan Kara } 2039884d179dSJan Kara mutex_lock(&dqopt->dqonoff_mutex); 2040884d179dSJan Kara if (sb_has_quota_loaded(sb, type)) { 2041884d179dSJan Kara error = -EBUSY; 2042884d179dSJan Kara goto out_lock; 2043884d179dSJan Kara } 2044884d179dSJan Kara 2045884d179dSJan Kara if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) { 2046884d179dSJan Kara /* We don't want quota and atime on quota files (deadlocks 2047884d179dSJan Kara * possible) Also nobody should write to the file - we use 2048884d179dSJan Kara * special IO operations which ignore the immutable bit. */ 2049dee86565SJan Kara mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA); 2050268157baSJan Kara oldflags = inode->i_flags & (S_NOATIME | S_IMMUTABLE | 2051268157baSJan Kara S_NOQUOTA); 2052884d179dSJan Kara inode->i_flags |= S_NOQUOTA | S_NOATIME | S_IMMUTABLE; 2053dee86565SJan Kara mutex_unlock(&inode->i_mutex); 205426245c94SJan Kara /* 205526245c94SJan Kara * When S_NOQUOTA is set, remove dquot references as no more 205626245c94SJan Kara * references can be added 205726245c94SJan Kara */ 20589f754758SChristoph Hellwig __dquot_drop(inode); 2059884d179dSJan Kara } 2060884d179dSJan Kara 2061884d179dSJan Kara error = -EIO; 2062884d179dSJan Kara dqopt->files[type] = igrab(inode); 2063884d179dSJan Kara if (!dqopt->files[type]) 2064884d179dSJan Kara goto out_lock; 2065884d179dSJan Kara error = -EINVAL; 2066884d179dSJan Kara if (!fmt->qf_ops->check_quota_file(sb, type)) 2067884d179dSJan Kara goto out_file_init; 2068884d179dSJan Kara 2069884d179dSJan Kara dqopt->ops[type] = fmt->qf_ops; 2070884d179dSJan Kara dqopt->info[type].dqi_format = fmt; 2071884d179dSJan Kara dqopt->info[type].dqi_fmt_id = format_id; 2072884d179dSJan Kara INIT_LIST_HEAD(&dqopt->info[type].dqi_dirty_list); 2073884d179dSJan Kara mutex_lock(&dqopt->dqio_mutex); 2074268157baSJan Kara error = dqopt->ops[type]->read_file_info(sb, type); 2075268157baSJan Kara if (error < 0) { 2076884d179dSJan Kara mutex_unlock(&dqopt->dqio_mutex); 2077884d179dSJan Kara goto out_file_init; 2078884d179dSJan Kara } 2079884d179dSJan Kara mutex_unlock(&dqopt->dqio_mutex); 2080884d179dSJan Kara spin_lock(&dq_state_lock); 2081884d179dSJan Kara dqopt->flags |= dquot_state_flag(flags, type); 2082884d179dSJan Kara spin_unlock(&dq_state_lock); 2083884d179dSJan Kara 2084884d179dSJan Kara add_dquot_ref(sb, type); 2085884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 2086884d179dSJan Kara 2087884d179dSJan Kara return 0; 2088884d179dSJan Kara 2089884d179dSJan Kara out_file_init: 2090884d179dSJan Kara dqopt->files[type] = NULL; 2091884d179dSJan Kara iput(inode); 2092884d179dSJan Kara out_lock: 2093884d179dSJan Kara if (oldflags != -1) { 2094dee86565SJan Kara mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA); 2095884d179dSJan Kara /* Set the flags back (in the case of accidental quotaon() 2096884d179dSJan Kara * on a wrong file we don't want to mess up the flags) */ 2097884d179dSJan Kara inode->i_flags &= ~(S_NOATIME | S_NOQUOTA | S_IMMUTABLE); 2098884d179dSJan Kara inode->i_flags |= oldflags; 2099dee86565SJan Kara mutex_unlock(&inode->i_mutex); 2100884d179dSJan Kara } 2101d01730d7SJiaying Zhang mutex_unlock(&dqopt->dqonoff_mutex); 2102884d179dSJan Kara out_fmt: 2103884d179dSJan Kara put_quota_format(fmt); 2104884d179dSJan Kara 2105884d179dSJan Kara return error; 2106884d179dSJan Kara } 2107884d179dSJan Kara 2108884d179dSJan Kara /* Reenable quotas on remount RW */ 21090f0dd62fSChristoph Hellwig int dquot_resume(struct super_block *sb, int type) 2110884d179dSJan Kara { 2111884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 2112884d179dSJan Kara struct inode *inode; 21130f0dd62fSChristoph Hellwig int ret = 0, cnt; 2114884d179dSJan Kara unsigned int flags; 2115884d179dSJan Kara 21160f0dd62fSChristoph Hellwig for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 21170f0dd62fSChristoph Hellwig if (type != -1 && cnt != type) 21180f0dd62fSChristoph Hellwig continue; 21190f0dd62fSChristoph Hellwig 2120884d179dSJan Kara mutex_lock(&dqopt->dqonoff_mutex); 21210f0dd62fSChristoph Hellwig if (!sb_has_quota_suspended(sb, cnt)) { 2122884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 21230f0dd62fSChristoph Hellwig continue; 2124884d179dSJan Kara } 21250f0dd62fSChristoph Hellwig inode = dqopt->files[cnt]; 21260f0dd62fSChristoph Hellwig dqopt->files[cnt] = NULL; 2127884d179dSJan Kara spin_lock(&dq_state_lock); 2128884d179dSJan Kara flags = dqopt->flags & dquot_state_flag(DQUOT_USAGE_ENABLED | 21290f0dd62fSChristoph Hellwig DQUOT_LIMITS_ENABLED, 21300f0dd62fSChristoph Hellwig cnt); 21310f0dd62fSChristoph Hellwig dqopt->flags &= ~dquot_state_flag(DQUOT_STATE_FLAGS, cnt); 2132884d179dSJan Kara spin_unlock(&dq_state_lock); 2133884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 2134884d179dSJan Kara 21350f0dd62fSChristoph Hellwig flags = dquot_generic_flag(flags, cnt); 21360f0dd62fSChristoph Hellwig ret = vfs_load_quota_inode(inode, cnt, 21370f0dd62fSChristoph Hellwig dqopt->info[cnt].dqi_fmt_id, flags); 2138884d179dSJan Kara iput(inode); 21390f0dd62fSChristoph Hellwig } 2140884d179dSJan Kara 2141884d179dSJan Kara return ret; 2142884d179dSJan Kara } 21430f0dd62fSChristoph Hellwig EXPORT_SYMBOL(dquot_resume); 2144884d179dSJan Kara 2145287a8095SChristoph Hellwig int dquot_quota_on_path(struct super_block *sb, int type, int format_id, 2146884d179dSJan Kara struct path *path) 2147884d179dSJan Kara { 2148884d179dSJan Kara int error = security_quota_on(path->dentry); 2149884d179dSJan Kara if (error) 2150884d179dSJan Kara return error; 2151884d179dSJan Kara /* Quota file not on the same filesystem? */ 2152884d179dSJan Kara if (path->mnt->mnt_sb != sb) 2153884d179dSJan Kara error = -EXDEV; 2154884d179dSJan Kara else 2155884d179dSJan Kara error = vfs_load_quota_inode(path->dentry->d_inode, type, 2156884d179dSJan Kara format_id, DQUOT_USAGE_ENABLED | 2157884d179dSJan Kara DQUOT_LIMITS_ENABLED); 2158884d179dSJan Kara return error; 2159884d179dSJan Kara } 2160287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_quota_on_path); 2161884d179dSJan Kara 2162287a8095SChristoph Hellwig int dquot_quota_on(struct super_block *sb, int type, int format_id, char *name) 2163884d179dSJan Kara { 2164884d179dSJan Kara struct path path; 2165884d179dSJan Kara int error; 2166884d179dSJan Kara 2167884d179dSJan Kara error = kern_path(name, LOOKUP_FOLLOW, &path); 2168884d179dSJan Kara if (!error) { 2169287a8095SChristoph Hellwig error = dquot_quota_on_path(sb, type, format_id, &path); 2170884d179dSJan Kara path_put(&path); 2171884d179dSJan Kara } 2172884d179dSJan Kara return error; 2173884d179dSJan Kara } 2174287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_quota_on); 2175884d179dSJan Kara 2176884d179dSJan Kara /* 2177884d179dSJan Kara * More powerful function for turning on quotas allowing setting 2178884d179dSJan Kara * of individual quota flags 2179884d179dSJan Kara */ 2180287a8095SChristoph Hellwig int dquot_enable(struct inode *inode, int type, int format_id, 2181884d179dSJan Kara unsigned int flags) 2182884d179dSJan Kara { 2183884d179dSJan Kara int ret = 0; 2184884d179dSJan Kara struct super_block *sb = inode->i_sb; 2185884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 2186884d179dSJan Kara 2187884d179dSJan Kara /* Just unsuspend quotas? */ 21880f0dd62fSChristoph Hellwig BUG_ON(flags & DQUOT_SUSPENDED); 21890f0dd62fSChristoph Hellwig 2190884d179dSJan Kara if (!flags) 2191884d179dSJan Kara return 0; 2192884d179dSJan Kara /* Just updating flags needed? */ 2193884d179dSJan Kara if (sb_has_quota_loaded(sb, type)) { 2194884d179dSJan Kara mutex_lock(&dqopt->dqonoff_mutex); 2195884d179dSJan Kara /* Now do a reliable test... */ 2196884d179dSJan Kara if (!sb_has_quota_loaded(sb, type)) { 2197884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 2198884d179dSJan Kara goto load_quota; 2199884d179dSJan Kara } 2200884d179dSJan Kara if (flags & DQUOT_USAGE_ENABLED && 2201884d179dSJan Kara sb_has_quota_usage_enabled(sb, type)) { 2202884d179dSJan Kara ret = -EBUSY; 2203884d179dSJan Kara goto out_lock; 2204884d179dSJan Kara } 2205884d179dSJan Kara if (flags & DQUOT_LIMITS_ENABLED && 2206884d179dSJan Kara sb_has_quota_limits_enabled(sb, type)) { 2207884d179dSJan Kara ret = -EBUSY; 2208884d179dSJan Kara goto out_lock; 2209884d179dSJan Kara } 2210884d179dSJan Kara spin_lock(&dq_state_lock); 2211884d179dSJan Kara sb_dqopt(sb)->flags |= dquot_state_flag(flags, type); 2212884d179dSJan Kara spin_unlock(&dq_state_lock); 2213884d179dSJan Kara out_lock: 2214884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 2215884d179dSJan Kara return ret; 2216884d179dSJan Kara } 2217884d179dSJan Kara 2218884d179dSJan Kara load_quota: 2219884d179dSJan Kara return vfs_load_quota_inode(inode, type, format_id, flags); 2220884d179dSJan Kara } 2221287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_enable); 2222884d179dSJan Kara 2223884d179dSJan Kara /* 2224884d179dSJan Kara * This function is used when filesystem needs to initialize quotas 2225884d179dSJan Kara * during mount time. 2226884d179dSJan Kara */ 2227287a8095SChristoph Hellwig int dquot_quota_on_mount(struct super_block *sb, char *qf_name, 2228884d179dSJan Kara int format_id, int type) 2229884d179dSJan Kara { 2230884d179dSJan Kara struct dentry *dentry; 2231884d179dSJan Kara int error; 2232884d179dSJan Kara 2233c56818d7SJan Kara mutex_lock(&sb->s_root->d_inode->i_mutex); 2234884d179dSJan Kara dentry = lookup_one_len(qf_name, sb->s_root, strlen(qf_name)); 2235c56818d7SJan Kara mutex_unlock(&sb->s_root->d_inode->i_mutex); 2236884d179dSJan Kara if (IS_ERR(dentry)) 2237884d179dSJan Kara return PTR_ERR(dentry); 2238884d179dSJan Kara 2239884d179dSJan Kara if (!dentry->d_inode) { 2240884d179dSJan Kara error = -ENOENT; 2241884d179dSJan Kara goto out; 2242884d179dSJan Kara } 2243884d179dSJan Kara 2244884d179dSJan Kara error = security_quota_on(dentry); 2245884d179dSJan Kara if (!error) 2246884d179dSJan Kara error = vfs_load_quota_inode(dentry->d_inode, type, format_id, 2247884d179dSJan Kara DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); 2248884d179dSJan Kara 2249884d179dSJan Kara out: 2250884d179dSJan Kara dput(dentry); 2251884d179dSJan Kara return error; 2252884d179dSJan Kara } 2253287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_quota_on_mount); 2254884d179dSJan Kara 2255884d179dSJan Kara static inline qsize_t qbtos(qsize_t blocks) 2256884d179dSJan Kara { 2257884d179dSJan Kara return blocks << QIF_DQBLKSIZE_BITS; 2258884d179dSJan Kara } 2259884d179dSJan Kara 2260884d179dSJan Kara static inline qsize_t stoqb(qsize_t space) 2261884d179dSJan Kara { 2262884d179dSJan Kara return (space + QIF_DQBLKSIZE - 1) >> QIF_DQBLKSIZE_BITS; 2263884d179dSJan Kara } 2264884d179dSJan Kara 2265884d179dSJan Kara /* Generic routine for getting common part of quota structure */ 2266b9b2dd36SChristoph Hellwig static void do_get_dqblk(struct dquot *dquot, struct fs_disk_quota *di) 2267884d179dSJan Kara { 2268884d179dSJan Kara struct mem_dqblk *dm = &dquot->dq_dqb; 2269884d179dSJan Kara 2270b9b2dd36SChristoph Hellwig memset(di, 0, sizeof(*di)); 2271b9b2dd36SChristoph Hellwig di->d_version = FS_DQUOT_VERSION; 2272b9b2dd36SChristoph Hellwig di->d_flags = dquot->dq_type == USRQUOTA ? 2273b9b2dd36SChristoph Hellwig XFS_USER_QUOTA : XFS_GROUP_QUOTA; 2274b9b2dd36SChristoph Hellwig di->d_id = dquot->dq_id; 2275b9b2dd36SChristoph Hellwig 2276884d179dSJan Kara spin_lock(&dq_data_lock); 2277b9b2dd36SChristoph Hellwig di->d_blk_hardlimit = stoqb(dm->dqb_bhardlimit); 2278b9b2dd36SChristoph Hellwig di->d_blk_softlimit = stoqb(dm->dqb_bsoftlimit); 2279b9b2dd36SChristoph Hellwig di->d_ino_hardlimit = dm->dqb_ihardlimit; 2280b9b2dd36SChristoph Hellwig di->d_ino_softlimit = dm->dqb_isoftlimit; 2281b9b2dd36SChristoph Hellwig di->d_bcount = dm->dqb_curspace + dm->dqb_rsvspace; 2282b9b2dd36SChristoph Hellwig di->d_icount = dm->dqb_curinodes; 2283b9b2dd36SChristoph Hellwig di->d_btimer = dm->dqb_btime; 2284b9b2dd36SChristoph Hellwig di->d_itimer = dm->dqb_itime; 2285884d179dSJan Kara spin_unlock(&dq_data_lock); 2286884d179dSJan Kara } 2287884d179dSJan Kara 2288287a8095SChristoph Hellwig int dquot_get_dqblk(struct super_block *sb, int type, qid_t id, 2289b9b2dd36SChristoph Hellwig struct fs_disk_quota *di) 2290884d179dSJan Kara { 2291884d179dSJan Kara struct dquot *dquot; 2292884d179dSJan Kara 2293884d179dSJan Kara dquot = dqget(sb, id, type); 2294dd6f3c6dSJan Kara if (!dquot) 2295884d179dSJan Kara return -ESRCH; 2296884d179dSJan Kara do_get_dqblk(dquot, di); 2297884d179dSJan Kara dqput(dquot); 2298884d179dSJan Kara 2299884d179dSJan Kara return 0; 2300884d179dSJan Kara } 2301287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_get_dqblk); 2302884d179dSJan Kara 2303c472b432SChristoph Hellwig #define VFS_FS_DQ_MASK \ 2304c472b432SChristoph Hellwig (FS_DQ_BCOUNT | FS_DQ_BSOFT | FS_DQ_BHARD | \ 2305c472b432SChristoph Hellwig FS_DQ_ICOUNT | FS_DQ_ISOFT | FS_DQ_IHARD | \ 2306c472b432SChristoph Hellwig FS_DQ_BTIMER | FS_DQ_ITIMER) 2307c472b432SChristoph Hellwig 2308884d179dSJan Kara /* Generic routine for setting common part of quota structure */ 2309c472b432SChristoph Hellwig static int do_set_dqblk(struct dquot *dquot, struct fs_disk_quota *di) 2310884d179dSJan Kara { 2311884d179dSJan Kara struct mem_dqblk *dm = &dquot->dq_dqb; 2312884d179dSJan Kara int check_blim = 0, check_ilim = 0; 2313884d179dSJan Kara struct mem_dqinfo *dqi = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_type]; 2314884d179dSJan Kara 2315c472b432SChristoph Hellwig if (di->d_fieldmask & ~VFS_FS_DQ_MASK) 2316c472b432SChristoph Hellwig return -EINVAL; 2317c472b432SChristoph Hellwig 2318c472b432SChristoph Hellwig if (((di->d_fieldmask & FS_DQ_BSOFT) && 2319c472b432SChristoph Hellwig (di->d_blk_softlimit > dqi->dqi_maxblimit)) || 2320c472b432SChristoph Hellwig ((di->d_fieldmask & FS_DQ_BHARD) && 2321c472b432SChristoph Hellwig (di->d_blk_hardlimit > dqi->dqi_maxblimit)) || 2322c472b432SChristoph Hellwig ((di->d_fieldmask & FS_DQ_ISOFT) && 2323c472b432SChristoph Hellwig (di->d_ino_softlimit > dqi->dqi_maxilimit)) || 2324c472b432SChristoph Hellwig ((di->d_fieldmask & FS_DQ_IHARD) && 2325c472b432SChristoph Hellwig (di->d_ino_hardlimit > dqi->dqi_maxilimit))) 2326884d179dSJan Kara return -ERANGE; 2327884d179dSJan Kara 2328884d179dSJan Kara spin_lock(&dq_data_lock); 2329c472b432SChristoph Hellwig if (di->d_fieldmask & FS_DQ_BCOUNT) { 2330c472b432SChristoph Hellwig dm->dqb_curspace = di->d_bcount - dm->dqb_rsvspace; 2331884d179dSJan Kara check_blim = 1; 233208261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags); 2333884d179dSJan Kara } 2334c472b432SChristoph Hellwig 2335c472b432SChristoph Hellwig if (di->d_fieldmask & FS_DQ_BSOFT) 2336c472b432SChristoph Hellwig dm->dqb_bsoftlimit = qbtos(di->d_blk_softlimit); 2337c472b432SChristoph Hellwig if (di->d_fieldmask & FS_DQ_BHARD) 2338c472b432SChristoph Hellwig dm->dqb_bhardlimit = qbtos(di->d_blk_hardlimit); 2339c472b432SChristoph Hellwig if (di->d_fieldmask & (FS_DQ_BSOFT | FS_DQ_BHARD)) { 2340884d179dSJan Kara check_blim = 1; 234108261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags); 2342884d179dSJan Kara } 2343c472b432SChristoph Hellwig 2344c472b432SChristoph Hellwig if (di->d_fieldmask & FS_DQ_ICOUNT) { 2345c472b432SChristoph Hellwig dm->dqb_curinodes = di->d_icount; 2346884d179dSJan Kara check_ilim = 1; 234708261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags); 2348884d179dSJan Kara } 2349c472b432SChristoph Hellwig 2350c472b432SChristoph Hellwig if (di->d_fieldmask & FS_DQ_ISOFT) 2351c472b432SChristoph Hellwig dm->dqb_isoftlimit = di->d_ino_softlimit; 2352c472b432SChristoph Hellwig if (di->d_fieldmask & FS_DQ_IHARD) 2353c472b432SChristoph Hellwig dm->dqb_ihardlimit = di->d_ino_hardlimit; 2354c472b432SChristoph Hellwig if (di->d_fieldmask & (FS_DQ_ISOFT | FS_DQ_IHARD)) { 2355884d179dSJan Kara check_ilim = 1; 235608261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags); 2357884d179dSJan Kara } 2358c472b432SChristoph Hellwig 2359c472b432SChristoph Hellwig if (di->d_fieldmask & FS_DQ_BTIMER) { 2360c472b432SChristoph Hellwig dm->dqb_btime = di->d_btimer; 2361884d179dSJan Kara check_blim = 1; 236208261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags); 2363884d179dSJan Kara } 2364c472b432SChristoph Hellwig 2365c472b432SChristoph Hellwig if (di->d_fieldmask & FS_DQ_ITIMER) { 2366c472b432SChristoph Hellwig dm->dqb_itime = di->d_itimer; 2367884d179dSJan Kara check_ilim = 1; 236808261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags); 2369884d179dSJan Kara } 2370884d179dSJan Kara 2371884d179dSJan Kara if (check_blim) { 2372268157baSJan Kara if (!dm->dqb_bsoftlimit || 2373268157baSJan Kara dm->dqb_curspace < dm->dqb_bsoftlimit) { 2374884d179dSJan Kara dm->dqb_btime = 0; 2375884d179dSJan Kara clear_bit(DQ_BLKS_B, &dquot->dq_flags); 2376c472b432SChristoph Hellwig } else if (!(di->d_fieldmask & FS_DQ_BTIMER)) 2377268157baSJan Kara /* Set grace only if user hasn't provided his own... */ 2378884d179dSJan Kara dm->dqb_btime = get_seconds() + dqi->dqi_bgrace; 2379884d179dSJan Kara } 2380884d179dSJan Kara if (check_ilim) { 2381268157baSJan Kara if (!dm->dqb_isoftlimit || 2382268157baSJan Kara dm->dqb_curinodes < dm->dqb_isoftlimit) { 2383884d179dSJan Kara dm->dqb_itime = 0; 2384884d179dSJan Kara clear_bit(DQ_INODES_B, &dquot->dq_flags); 2385c472b432SChristoph Hellwig } else if (!(di->d_fieldmask & FS_DQ_ITIMER)) 2386268157baSJan Kara /* Set grace only if user hasn't provided his own... */ 2387884d179dSJan Kara dm->dqb_itime = get_seconds() + dqi->dqi_igrace; 2388884d179dSJan Kara } 2389268157baSJan Kara if (dm->dqb_bhardlimit || dm->dqb_bsoftlimit || dm->dqb_ihardlimit || 2390268157baSJan Kara dm->dqb_isoftlimit) 2391884d179dSJan Kara clear_bit(DQ_FAKE_B, &dquot->dq_flags); 2392884d179dSJan Kara else 2393884d179dSJan Kara set_bit(DQ_FAKE_B, &dquot->dq_flags); 2394884d179dSJan Kara spin_unlock(&dq_data_lock); 2395884d179dSJan Kara mark_dquot_dirty(dquot); 2396884d179dSJan Kara 2397884d179dSJan Kara return 0; 2398884d179dSJan Kara } 2399884d179dSJan Kara 2400287a8095SChristoph Hellwig int dquot_set_dqblk(struct super_block *sb, int type, qid_t id, 2401c472b432SChristoph Hellwig struct fs_disk_quota *di) 2402884d179dSJan Kara { 2403884d179dSJan Kara struct dquot *dquot; 2404884d179dSJan Kara int rc; 2405884d179dSJan Kara 2406884d179dSJan Kara dquot = dqget(sb, id, type); 2407884d179dSJan Kara if (!dquot) { 2408884d179dSJan Kara rc = -ESRCH; 2409884d179dSJan Kara goto out; 2410884d179dSJan Kara } 2411884d179dSJan Kara rc = do_set_dqblk(dquot, di); 2412884d179dSJan Kara dqput(dquot); 2413884d179dSJan Kara out: 2414884d179dSJan Kara return rc; 2415884d179dSJan Kara } 2416287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_set_dqblk); 2417884d179dSJan Kara 2418884d179dSJan Kara /* Generic routine for getting common part of quota file information */ 2419287a8095SChristoph Hellwig int dquot_get_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii) 2420884d179dSJan Kara { 2421884d179dSJan Kara struct mem_dqinfo *mi; 2422884d179dSJan Kara 2423884d179dSJan Kara mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); 2424884d179dSJan Kara if (!sb_has_quota_active(sb, type)) { 2425884d179dSJan Kara mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); 2426884d179dSJan Kara return -ESRCH; 2427884d179dSJan Kara } 2428884d179dSJan Kara mi = sb_dqopt(sb)->info + type; 2429884d179dSJan Kara spin_lock(&dq_data_lock); 2430884d179dSJan Kara ii->dqi_bgrace = mi->dqi_bgrace; 2431884d179dSJan Kara ii->dqi_igrace = mi->dqi_igrace; 2432884d179dSJan Kara ii->dqi_flags = mi->dqi_flags & DQF_MASK; 2433884d179dSJan Kara ii->dqi_valid = IIF_ALL; 2434884d179dSJan Kara spin_unlock(&dq_data_lock); 2435884d179dSJan Kara mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); 2436884d179dSJan Kara return 0; 2437884d179dSJan Kara } 2438287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_get_dqinfo); 2439884d179dSJan Kara 2440884d179dSJan Kara /* Generic routine for setting common part of quota file information */ 2441287a8095SChristoph Hellwig int dquot_set_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii) 2442884d179dSJan Kara { 2443884d179dSJan Kara struct mem_dqinfo *mi; 2444884d179dSJan Kara int err = 0; 2445884d179dSJan Kara 2446884d179dSJan Kara mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); 2447884d179dSJan Kara if (!sb_has_quota_active(sb, type)) { 2448884d179dSJan Kara err = -ESRCH; 2449884d179dSJan Kara goto out; 2450884d179dSJan Kara } 2451884d179dSJan Kara mi = sb_dqopt(sb)->info + type; 2452884d179dSJan Kara spin_lock(&dq_data_lock); 2453884d179dSJan Kara if (ii->dqi_valid & IIF_BGRACE) 2454884d179dSJan Kara mi->dqi_bgrace = ii->dqi_bgrace; 2455884d179dSJan Kara if (ii->dqi_valid & IIF_IGRACE) 2456884d179dSJan Kara mi->dqi_igrace = ii->dqi_igrace; 2457884d179dSJan Kara if (ii->dqi_valid & IIF_FLAGS) 2458268157baSJan Kara mi->dqi_flags = (mi->dqi_flags & ~DQF_MASK) | 2459268157baSJan Kara (ii->dqi_flags & DQF_MASK); 2460884d179dSJan Kara spin_unlock(&dq_data_lock); 2461884d179dSJan Kara mark_info_dirty(sb, type); 2462884d179dSJan Kara /* Force write to disk */ 2463884d179dSJan Kara sb->dq_op->write_info(sb, type); 2464884d179dSJan Kara out: 2465884d179dSJan Kara mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); 2466884d179dSJan Kara return err; 2467884d179dSJan Kara } 2468287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_set_dqinfo); 2469884d179dSJan Kara 2470287a8095SChristoph Hellwig const struct quotactl_ops dquot_quotactl_ops = { 2471287a8095SChristoph Hellwig .quota_on = dquot_quota_on, 2472287a8095SChristoph Hellwig .quota_off = dquot_quota_off, 2473287a8095SChristoph Hellwig .quota_sync = dquot_quota_sync, 2474287a8095SChristoph Hellwig .get_info = dquot_get_dqinfo, 2475287a8095SChristoph Hellwig .set_info = dquot_set_dqinfo, 2476287a8095SChristoph Hellwig .get_dqblk = dquot_get_dqblk, 2477287a8095SChristoph Hellwig .set_dqblk = dquot_set_dqblk 2478884d179dSJan Kara }; 2479287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_quotactl_ops); 2480dde95888SDmitry Monakhov 2481dde95888SDmitry Monakhov static int do_proc_dqstats(struct ctl_table *table, int write, 2482dde95888SDmitry Monakhov void __user *buffer, size_t *lenp, loff_t *ppos) 2483dde95888SDmitry Monakhov { 2484dde95888SDmitry Monakhov unsigned int type = (int *)table->data - dqstats.stat; 2485f32764bdSDmitry Monakhov 2486f32764bdSDmitry Monakhov /* Update global table */ 2487f32764bdSDmitry Monakhov dqstats.stat[type] = 2488f32764bdSDmitry Monakhov percpu_counter_sum_positive(&dqstats.counter[type]); 2489dde95888SDmitry Monakhov return proc_dointvec(table, write, buffer, lenp, ppos); 2490dde95888SDmitry Monakhov } 2491dde95888SDmitry Monakhov 2492884d179dSJan Kara static ctl_table fs_dqstats_table[] = { 2493884d179dSJan Kara { 2494884d179dSJan Kara .procname = "lookups", 2495dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_LOOKUPS], 2496884d179dSJan Kara .maxlen = sizeof(int), 2497884d179dSJan Kara .mode = 0444, 2498dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2499884d179dSJan Kara }, 2500884d179dSJan Kara { 2501884d179dSJan Kara .procname = "drops", 2502dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_DROPS], 2503884d179dSJan Kara .maxlen = sizeof(int), 2504884d179dSJan Kara .mode = 0444, 2505dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2506884d179dSJan Kara }, 2507884d179dSJan Kara { 2508884d179dSJan Kara .procname = "reads", 2509dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_READS], 2510884d179dSJan Kara .maxlen = sizeof(int), 2511884d179dSJan Kara .mode = 0444, 2512dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2513884d179dSJan Kara }, 2514884d179dSJan Kara { 2515884d179dSJan Kara .procname = "writes", 2516dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_WRITES], 2517884d179dSJan Kara .maxlen = sizeof(int), 2518884d179dSJan Kara .mode = 0444, 2519dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2520884d179dSJan Kara }, 2521884d179dSJan Kara { 2522884d179dSJan Kara .procname = "cache_hits", 2523dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_CACHE_HITS], 2524884d179dSJan Kara .maxlen = sizeof(int), 2525884d179dSJan Kara .mode = 0444, 2526dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2527884d179dSJan Kara }, 2528884d179dSJan Kara { 2529884d179dSJan Kara .procname = "allocated_dquots", 2530dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_ALLOC_DQUOTS], 2531884d179dSJan Kara .maxlen = sizeof(int), 2532884d179dSJan Kara .mode = 0444, 2533dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2534884d179dSJan Kara }, 2535884d179dSJan Kara { 2536884d179dSJan Kara .procname = "free_dquots", 2537dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_FREE_DQUOTS], 2538884d179dSJan Kara .maxlen = sizeof(int), 2539884d179dSJan Kara .mode = 0444, 2540dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2541884d179dSJan Kara }, 2542884d179dSJan Kara { 2543884d179dSJan Kara .procname = "syncs", 2544dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_SYNCS], 2545884d179dSJan Kara .maxlen = sizeof(int), 2546884d179dSJan Kara .mode = 0444, 2547dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2548884d179dSJan Kara }, 2549884d179dSJan Kara #ifdef CONFIG_PRINT_QUOTA_WARNING 2550884d179dSJan Kara { 2551884d179dSJan Kara .procname = "warnings", 2552884d179dSJan Kara .data = &flag_print_warnings, 2553884d179dSJan Kara .maxlen = sizeof(int), 2554884d179dSJan Kara .mode = 0644, 25556d456111SEric W. Biederman .proc_handler = proc_dointvec, 2556884d179dSJan Kara }, 2557884d179dSJan Kara #endif 2558ab09203eSEric W. Biederman { }, 2559884d179dSJan Kara }; 2560884d179dSJan Kara 2561884d179dSJan Kara static ctl_table fs_table[] = { 2562884d179dSJan Kara { 2563884d179dSJan Kara .procname = "quota", 2564884d179dSJan Kara .mode = 0555, 2565884d179dSJan Kara .child = fs_dqstats_table, 2566884d179dSJan Kara }, 2567ab09203eSEric W. Biederman { }, 2568884d179dSJan Kara }; 2569884d179dSJan Kara 2570884d179dSJan Kara static ctl_table sys_table[] = { 2571884d179dSJan Kara { 2572884d179dSJan Kara .procname = "fs", 2573884d179dSJan Kara .mode = 0555, 2574884d179dSJan Kara .child = fs_table, 2575884d179dSJan Kara }, 2576ab09203eSEric W. Biederman { }, 2577884d179dSJan Kara }; 2578884d179dSJan Kara 2579884d179dSJan Kara static int __init dquot_init(void) 2580884d179dSJan Kara { 2581f32764bdSDmitry Monakhov int i, ret; 2582884d179dSJan Kara unsigned long nr_hash, order; 2583884d179dSJan Kara 2584884d179dSJan Kara printk(KERN_NOTICE "VFS: Disk quotas %s\n", __DQUOT_VERSION__); 2585884d179dSJan Kara 2586884d179dSJan Kara register_sysctl_table(sys_table); 2587884d179dSJan Kara 2588884d179dSJan Kara dquot_cachep = kmem_cache_create("dquot", 2589884d179dSJan Kara sizeof(struct dquot), sizeof(unsigned long) * 4, 2590884d179dSJan Kara (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| 2591884d179dSJan Kara SLAB_MEM_SPREAD|SLAB_PANIC), 2592884d179dSJan Kara NULL); 2593884d179dSJan Kara 2594884d179dSJan Kara order = 0; 2595884d179dSJan Kara dquot_hash = (struct hlist_head *)__get_free_pages(GFP_ATOMIC, order); 2596884d179dSJan Kara if (!dquot_hash) 2597884d179dSJan Kara panic("Cannot create dquot hash table"); 2598884d179dSJan Kara 2599f32764bdSDmitry Monakhov for (i = 0; i < _DQST_DQSTAT_LAST; i++) { 2600f32764bdSDmitry Monakhov ret = percpu_counter_init(&dqstats.counter[i], 0); 2601f32764bdSDmitry Monakhov if (ret) 2602f32764bdSDmitry Monakhov panic("Cannot create dquot stat counters"); 2603f32764bdSDmitry Monakhov } 2604dde95888SDmitry Monakhov 2605884d179dSJan Kara /* Find power-of-two hlist_heads which can fit into allocation */ 2606884d179dSJan Kara nr_hash = (1UL << order) * PAGE_SIZE / sizeof(struct hlist_head); 2607884d179dSJan Kara dq_hash_bits = 0; 2608884d179dSJan Kara do { 2609884d179dSJan Kara dq_hash_bits++; 2610884d179dSJan Kara } while (nr_hash >> dq_hash_bits); 2611884d179dSJan Kara dq_hash_bits--; 2612884d179dSJan Kara 2613884d179dSJan Kara nr_hash = 1UL << dq_hash_bits; 2614884d179dSJan Kara dq_hash_mask = nr_hash - 1; 2615884d179dSJan Kara for (i = 0; i < nr_hash; i++) 2616884d179dSJan Kara INIT_HLIST_HEAD(dquot_hash + i); 2617884d179dSJan Kara 2618884d179dSJan Kara printk("Dquot-cache hash table entries: %ld (order %ld, %ld bytes)\n", 2619884d179dSJan Kara nr_hash, order, (PAGE_SIZE << order)); 2620884d179dSJan Kara 2621884d179dSJan Kara register_shrinker(&dqcache_shrinker); 2622884d179dSJan Kara 2623884d179dSJan Kara return 0; 2624884d179dSJan Kara } 2625884d179dSJan Kara module_init(dquot_init); 2626