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 85884d179dSJan Kara * and quota formats, dqstats structure containing statistics about the lists 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 135884d179dSJan Kara static char *quotatypes[] = INITQFNAMES; 136884d179dSJan Kara static struct quota_format_type *quota_formats; /* List of registered formats */ 137884d179dSJan Kara static struct quota_module_name module_names[] = INIT_QUOTA_MODULE_NAMES; 138884d179dSJan Kara 139884d179dSJan Kara /* SLAB cache for dquot structures */ 140884d179dSJan Kara static struct kmem_cache *dquot_cachep; 141884d179dSJan Kara 142884d179dSJan Kara int register_quota_format(struct quota_format_type *fmt) 143884d179dSJan Kara { 144884d179dSJan Kara spin_lock(&dq_list_lock); 145884d179dSJan Kara fmt->qf_next = quota_formats; 146884d179dSJan Kara quota_formats = fmt; 147884d179dSJan Kara spin_unlock(&dq_list_lock); 148884d179dSJan Kara return 0; 149884d179dSJan Kara } 150884d179dSJan Kara EXPORT_SYMBOL(register_quota_format); 151884d179dSJan Kara 152884d179dSJan Kara void unregister_quota_format(struct quota_format_type *fmt) 153884d179dSJan Kara { 154884d179dSJan Kara struct quota_format_type **actqf; 155884d179dSJan Kara 156884d179dSJan Kara spin_lock(&dq_list_lock); 157268157baSJan Kara for (actqf = "a_formats; *actqf && *actqf != fmt; 158268157baSJan Kara actqf = &(*actqf)->qf_next) 159268157baSJan Kara ; 160884d179dSJan Kara if (*actqf) 161884d179dSJan Kara *actqf = (*actqf)->qf_next; 162884d179dSJan Kara spin_unlock(&dq_list_lock); 163884d179dSJan Kara } 164884d179dSJan Kara EXPORT_SYMBOL(unregister_quota_format); 165884d179dSJan Kara 166884d179dSJan Kara static struct quota_format_type *find_quota_format(int id) 167884d179dSJan Kara { 168884d179dSJan Kara struct quota_format_type *actqf; 169884d179dSJan Kara 170884d179dSJan Kara spin_lock(&dq_list_lock); 171268157baSJan Kara for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id; 172268157baSJan Kara actqf = actqf->qf_next) 173268157baSJan Kara ; 174884d179dSJan Kara if (!actqf || !try_module_get(actqf->qf_owner)) { 175884d179dSJan Kara int qm; 176884d179dSJan Kara 177884d179dSJan Kara spin_unlock(&dq_list_lock); 178884d179dSJan Kara 179268157baSJan Kara for (qm = 0; module_names[qm].qm_fmt_id && 180268157baSJan Kara module_names[qm].qm_fmt_id != id; qm++) 181268157baSJan Kara ; 182268157baSJan Kara if (!module_names[qm].qm_fmt_id || 183268157baSJan Kara request_module(module_names[qm].qm_mod_name)) 184884d179dSJan Kara return NULL; 185884d179dSJan Kara 186884d179dSJan Kara spin_lock(&dq_list_lock); 187268157baSJan Kara for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id; 188268157baSJan Kara actqf = actqf->qf_next) 189268157baSJan Kara ; 190884d179dSJan Kara if (actqf && !try_module_get(actqf->qf_owner)) 191884d179dSJan Kara actqf = NULL; 192884d179dSJan Kara } 193884d179dSJan Kara spin_unlock(&dq_list_lock); 194884d179dSJan Kara return actqf; 195884d179dSJan Kara } 196884d179dSJan Kara 197884d179dSJan Kara static void put_quota_format(struct quota_format_type *fmt) 198884d179dSJan Kara { 199884d179dSJan Kara module_put(fmt->qf_owner); 200884d179dSJan Kara } 201884d179dSJan Kara 202884d179dSJan Kara /* 203884d179dSJan Kara * Dquot List Management: 204884d179dSJan Kara * The quota code uses three lists for dquot management: the inuse_list, 205884d179dSJan Kara * free_dquots, and dquot_hash[] array. A single dquot structure may be 206884d179dSJan Kara * on all three lists, depending on its current state. 207884d179dSJan Kara * 208884d179dSJan Kara * All dquots are placed to the end of inuse_list when first created, and this 209884d179dSJan Kara * list is used for invalidate operation, which must look at every dquot. 210884d179dSJan Kara * 211884d179dSJan Kara * Unused dquots (dq_count == 0) are added to the free_dquots list when freed, 212884d179dSJan Kara * and this list is searched whenever we need an available dquot. Dquots are 213884d179dSJan Kara * removed from the list as soon as they are used again, and 214884d179dSJan Kara * dqstats.free_dquots gives the number of dquots on the list. When 215884d179dSJan Kara * dquot is invalidated it's completely released from memory. 216884d179dSJan Kara * 217884d179dSJan Kara * Dquots with a specific identity (device, type and id) are placed on 218884d179dSJan Kara * one of the dquot_hash[] hash chains. The provides an efficient search 219884d179dSJan Kara * mechanism to locate a specific dquot. 220884d179dSJan Kara */ 221884d179dSJan Kara 222884d179dSJan Kara static LIST_HEAD(inuse_list); 223884d179dSJan Kara static LIST_HEAD(free_dquots); 224884d179dSJan Kara static unsigned int dq_hash_bits, dq_hash_mask; 225884d179dSJan Kara static struct hlist_head *dquot_hash; 226884d179dSJan Kara 227884d179dSJan Kara struct dqstats dqstats; 228884d179dSJan Kara EXPORT_SYMBOL(dqstats); 229884d179dSJan Kara 2300a5a9c72SJan Kara static qsize_t inode_get_rsv_space(struct inode *inode); 231871a2931SChristoph Hellwig static void __dquot_initialize(struct inode *inode, int type); 2320a5a9c72SJan Kara 233884d179dSJan Kara static inline unsigned int 234884d179dSJan Kara hashfn(const struct super_block *sb, unsigned int id, int type) 235884d179dSJan Kara { 236884d179dSJan Kara unsigned long tmp; 237884d179dSJan Kara 238884d179dSJan Kara tmp = (((unsigned long)sb>>L1_CACHE_SHIFT) ^ id) * (MAXQUOTAS - type); 239884d179dSJan Kara return (tmp + (tmp >> dq_hash_bits)) & dq_hash_mask; 240884d179dSJan Kara } 241884d179dSJan Kara 242884d179dSJan Kara /* 243884d179dSJan Kara * Following list functions expect dq_list_lock to be held 244884d179dSJan Kara */ 245884d179dSJan Kara static inline void insert_dquot_hash(struct dquot *dquot) 246884d179dSJan Kara { 247268157baSJan Kara struct hlist_head *head; 248268157baSJan Kara head = dquot_hash + hashfn(dquot->dq_sb, dquot->dq_id, dquot->dq_type); 249884d179dSJan Kara hlist_add_head(&dquot->dq_hash, head); 250884d179dSJan Kara } 251884d179dSJan Kara 252884d179dSJan Kara static inline void remove_dquot_hash(struct dquot *dquot) 253884d179dSJan Kara { 254884d179dSJan Kara hlist_del_init(&dquot->dq_hash); 255884d179dSJan Kara } 256884d179dSJan Kara 2577a2435d8SJan Kara static struct dquot *find_dquot(unsigned int hashent, struct super_block *sb, 2587a2435d8SJan Kara unsigned int id, int type) 259884d179dSJan Kara { 260884d179dSJan Kara struct hlist_node *node; 261884d179dSJan Kara struct dquot *dquot; 262884d179dSJan Kara 263884d179dSJan Kara hlist_for_each (node, dquot_hash+hashent) { 264884d179dSJan Kara dquot = hlist_entry(node, struct dquot, dq_hash); 265268157baSJan Kara if (dquot->dq_sb == sb && dquot->dq_id == id && 266268157baSJan Kara dquot->dq_type == type) 267884d179dSJan Kara return dquot; 268884d179dSJan Kara } 269dd6f3c6dSJan Kara return NULL; 270884d179dSJan Kara } 271884d179dSJan Kara 272884d179dSJan Kara /* Add a dquot to the tail of the free list */ 273884d179dSJan Kara static inline void put_dquot_last(struct dquot *dquot) 274884d179dSJan Kara { 275884d179dSJan Kara list_add_tail(&dquot->dq_free, &free_dquots); 276884d179dSJan Kara dqstats.free_dquots++; 277884d179dSJan Kara } 278884d179dSJan Kara 279884d179dSJan Kara static inline void remove_free_dquot(struct dquot *dquot) 280884d179dSJan Kara { 281884d179dSJan Kara if (list_empty(&dquot->dq_free)) 282884d179dSJan Kara return; 283884d179dSJan Kara list_del_init(&dquot->dq_free); 284884d179dSJan Kara dqstats.free_dquots--; 285884d179dSJan Kara } 286884d179dSJan Kara 287884d179dSJan Kara static inline void put_inuse(struct dquot *dquot) 288884d179dSJan Kara { 289884d179dSJan Kara /* We add to the back of inuse list so we don't have to restart 290884d179dSJan Kara * when traversing this list and we block */ 291884d179dSJan Kara list_add_tail(&dquot->dq_inuse, &inuse_list); 292884d179dSJan Kara dqstats.allocated_dquots++; 293884d179dSJan Kara } 294884d179dSJan Kara 295884d179dSJan Kara static inline void remove_inuse(struct dquot *dquot) 296884d179dSJan Kara { 297884d179dSJan Kara dqstats.allocated_dquots--; 298884d179dSJan Kara list_del(&dquot->dq_inuse); 299884d179dSJan Kara } 300884d179dSJan Kara /* 301884d179dSJan Kara * End of list functions needing dq_list_lock 302884d179dSJan Kara */ 303884d179dSJan Kara 304884d179dSJan Kara static void wait_on_dquot(struct dquot *dquot) 305884d179dSJan Kara { 306884d179dSJan Kara mutex_lock(&dquot->dq_lock); 307884d179dSJan Kara mutex_unlock(&dquot->dq_lock); 308884d179dSJan Kara } 309884d179dSJan Kara 310884d179dSJan Kara static inline int dquot_dirty(struct dquot *dquot) 311884d179dSJan Kara { 312884d179dSJan Kara return test_bit(DQ_MOD_B, &dquot->dq_flags); 313884d179dSJan Kara } 314884d179dSJan Kara 315884d179dSJan Kara static inline int mark_dquot_dirty(struct dquot *dquot) 316884d179dSJan Kara { 317884d179dSJan Kara return dquot->dq_sb->dq_op->mark_dirty(dquot); 318884d179dSJan Kara } 319884d179dSJan Kara 320*eabf290dSDmitry Monakhov /* Mark dquot dirty in atomic manner, and return it's old dirty flag state */ 321884d179dSJan Kara int dquot_mark_dquot_dirty(struct dquot *dquot) 322884d179dSJan Kara { 323*eabf290dSDmitry Monakhov int ret = 1; 324*eabf290dSDmitry Monakhov 325*eabf290dSDmitry Monakhov /* If quota is dirty already, we don't have to acquire dq_list_lock */ 326*eabf290dSDmitry Monakhov if (test_bit(DQ_MOD_B, &dquot->dq_flags)) 327*eabf290dSDmitry Monakhov return 1; 328*eabf290dSDmitry Monakhov 329884d179dSJan Kara spin_lock(&dq_list_lock); 330*eabf290dSDmitry Monakhov if (!test_and_set_bit(DQ_MOD_B, &dquot->dq_flags)) { 331884d179dSJan Kara list_add(&dquot->dq_dirty, &sb_dqopt(dquot->dq_sb)-> 332884d179dSJan Kara info[dquot->dq_type].dqi_dirty_list); 333*eabf290dSDmitry Monakhov ret = 0; 334*eabf290dSDmitry Monakhov } 335884d179dSJan Kara spin_unlock(&dq_list_lock); 336*eabf290dSDmitry Monakhov return ret; 337884d179dSJan Kara } 338884d179dSJan Kara EXPORT_SYMBOL(dquot_mark_dquot_dirty); 339884d179dSJan Kara 340dc52dd3aSDmitry Monakhov /* Dirtify all the dquots - this can block when journalling */ 341dc52dd3aSDmitry Monakhov static inline int mark_all_dquot_dirty(struct dquot * const *dquot) 342dc52dd3aSDmitry Monakhov { 343dc52dd3aSDmitry Monakhov int ret, err, cnt; 344dc52dd3aSDmitry Monakhov 345dc52dd3aSDmitry Monakhov ret = err = 0; 346dc52dd3aSDmitry Monakhov for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 347dc52dd3aSDmitry Monakhov if (dquot[cnt]) 348dc52dd3aSDmitry Monakhov /* Even in case of error we have to continue */ 349dc52dd3aSDmitry Monakhov ret = mark_dquot_dirty(dquot[cnt]); 350dc52dd3aSDmitry Monakhov if (!err) 351dc52dd3aSDmitry Monakhov err = ret; 352dc52dd3aSDmitry Monakhov } 353dc52dd3aSDmitry Monakhov return err; 354dc52dd3aSDmitry Monakhov } 355dc52dd3aSDmitry Monakhov 356dc52dd3aSDmitry Monakhov static inline void dqput_all(struct dquot **dquot) 357dc52dd3aSDmitry Monakhov { 358dc52dd3aSDmitry Monakhov unsigned int cnt; 359dc52dd3aSDmitry Monakhov 360dc52dd3aSDmitry Monakhov for (cnt = 0; cnt < MAXQUOTAS; cnt++) 361dc52dd3aSDmitry Monakhov dqput(dquot[cnt]); 362dc52dd3aSDmitry Monakhov } 363dc52dd3aSDmitry Monakhov 364884d179dSJan Kara /* This function needs dq_list_lock */ 365884d179dSJan Kara static inline int clear_dquot_dirty(struct dquot *dquot) 366884d179dSJan Kara { 367884d179dSJan Kara if (!test_and_clear_bit(DQ_MOD_B, &dquot->dq_flags)) 368884d179dSJan Kara return 0; 369884d179dSJan Kara list_del_init(&dquot->dq_dirty); 370884d179dSJan Kara return 1; 371884d179dSJan Kara } 372884d179dSJan Kara 373884d179dSJan Kara void mark_info_dirty(struct super_block *sb, int type) 374884d179dSJan Kara { 375884d179dSJan Kara set_bit(DQF_INFO_DIRTY_B, &sb_dqopt(sb)->info[type].dqi_flags); 376884d179dSJan Kara } 377884d179dSJan Kara EXPORT_SYMBOL(mark_info_dirty); 378884d179dSJan Kara 379884d179dSJan Kara /* 380884d179dSJan Kara * Read dquot from disk and alloc space for it 381884d179dSJan Kara */ 382884d179dSJan Kara 383884d179dSJan Kara int dquot_acquire(struct dquot *dquot) 384884d179dSJan Kara { 385884d179dSJan Kara int ret = 0, ret2 = 0; 386884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); 387884d179dSJan Kara 388884d179dSJan Kara mutex_lock(&dquot->dq_lock); 389884d179dSJan Kara mutex_lock(&dqopt->dqio_mutex); 390884d179dSJan Kara if (!test_bit(DQ_READ_B, &dquot->dq_flags)) 391884d179dSJan Kara ret = dqopt->ops[dquot->dq_type]->read_dqblk(dquot); 392884d179dSJan Kara if (ret < 0) 393884d179dSJan Kara goto out_iolock; 394884d179dSJan Kara set_bit(DQ_READ_B, &dquot->dq_flags); 395884d179dSJan Kara /* Instantiate dquot if needed */ 396884d179dSJan Kara if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && !dquot->dq_off) { 397884d179dSJan Kara ret = dqopt->ops[dquot->dq_type]->commit_dqblk(dquot); 398884d179dSJan Kara /* Write the info if needed */ 399268157baSJan Kara if (info_dirty(&dqopt->info[dquot->dq_type])) { 400268157baSJan Kara ret2 = dqopt->ops[dquot->dq_type]->write_file_info( 401268157baSJan Kara dquot->dq_sb, dquot->dq_type); 402268157baSJan Kara } 403884d179dSJan Kara if (ret < 0) 404884d179dSJan Kara goto out_iolock; 405884d179dSJan Kara if (ret2 < 0) { 406884d179dSJan Kara ret = ret2; 407884d179dSJan Kara goto out_iolock; 408884d179dSJan Kara } 409884d179dSJan Kara } 410884d179dSJan Kara set_bit(DQ_ACTIVE_B, &dquot->dq_flags); 411884d179dSJan Kara out_iolock: 412884d179dSJan Kara mutex_unlock(&dqopt->dqio_mutex); 413884d179dSJan Kara mutex_unlock(&dquot->dq_lock); 414884d179dSJan Kara return ret; 415884d179dSJan Kara } 416884d179dSJan Kara EXPORT_SYMBOL(dquot_acquire); 417884d179dSJan Kara 418884d179dSJan Kara /* 419884d179dSJan Kara * Write dquot to disk 420884d179dSJan Kara */ 421884d179dSJan Kara int dquot_commit(struct dquot *dquot) 422884d179dSJan Kara { 423884d179dSJan Kara int ret = 0, ret2 = 0; 424884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); 425884d179dSJan Kara 426884d179dSJan Kara mutex_lock(&dqopt->dqio_mutex); 427884d179dSJan Kara spin_lock(&dq_list_lock); 428884d179dSJan Kara if (!clear_dquot_dirty(dquot)) { 429884d179dSJan Kara spin_unlock(&dq_list_lock); 430884d179dSJan Kara goto out_sem; 431884d179dSJan Kara } 432884d179dSJan Kara spin_unlock(&dq_list_lock); 433884d179dSJan Kara /* Inactive dquot can be only if there was error during read/init 434884d179dSJan Kara * => we have better not writing it */ 435884d179dSJan Kara if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { 436884d179dSJan Kara ret = dqopt->ops[dquot->dq_type]->commit_dqblk(dquot); 437268157baSJan Kara if (info_dirty(&dqopt->info[dquot->dq_type])) { 438268157baSJan Kara ret2 = dqopt->ops[dquot->dq_type]->write_file_info( 439268157baSJan Kara dquot->dq_sb, dquot->dq_type); 440268157baSJan Kara } 441884d179dSJan Kara if (ret >= 0) 442884d179dSJan Kara ret = ret2; 443884d179dSJan Kara } 444884d179dSJan Kara out_sem: 445884d179dSJan Kara mutex_unlock(&dqopt->dqio_mutex); 446884d179dSJan Kara return ret; 447884d179dSJan Kara } 448884d179dSJan Kara EXPORT_SYMBOL(dquot_commit); 449884d179dSJan Kara 450884d179dSJan Kara /* 451884d179dSJan Kara * Release dquot 452884d179dSJan Kara */ 453884d179dSJan Kara int dquot_release(struct dquot *dquot) 454884d179dSJan Kara { 455884d179dSJan Kara int ret = 0, ret2 = 0; 456884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); 457884d179dSJan Kara 458884d179dSJan Kara mutex_lock(&dquot->dq_lock); 459884d179dSJan Kara /* Check whether we are not racing with some other dqget() */ 460884d179dSJan Kara if (atomic_read(&dquot->dq_count) > 1) 461884d179dSJan Kara goto out_dqlock; 462884d179dSJan Kara mutex_lock(&dqopt->dqio_mutex); 463884d179dSJan Kara if (dqopt->ops[dquot->dq_type]->release_dqblk) { 464884d179dSJan Kara ret = dqopt->ops[dquot->dq_type]->release_dqblk(dquot); 465884d179dSJan Kara /* Write the info */ 466268157baSJan Kara if (info_dirty(&dqopt->info[dquot->dq_type])) { 467268157baSJan Kara ret2 = dqopt->ops[dquot->dq_type]->write_file_info( 468268157baSJan Kara dquot->dq_sb, dquot->dq_type); 469268157baSJan Kara } 470884d179dSJan Kara if (ret >= 0) 471884d179dSJan Kara ret = ret2; 472884d179dSJan Kara } 473884d179dSJan Kara clear_bit(DQ_ACTIVE_B, &dquot->dq_flags); 474884d179dSJan Kara mutex_unlock(&dqopt->dqio_mutex); 475884d179dSJan Kara out_dqlock: 476884d179dSJan Kara mutex_unlock(&dquot->dq_lock); 477884d179dSJan Kara return ret; 478884d179dSJan Kara } 479884d179dSJan Kara EXPORT_SYMBOL(dquot_release); 480884d179dSJan Kara 481884d179dSJan Kara void dquot_destroy(struct dquot *dquot) 482884d179dSJan Kara { 483884d179dSJan Kara kmem_cache_free(dquot_cachep, dquot); 484884d179dSJan Kara } 485884d179dSJan Kara EXPORT_SYMBOL(dquot_destroy); 486884d179dSJan Kara 487884d179dSJan Kara static inline void do_destroy_dquot(struct dquot *dquot) 488884d179dSJan Kara { 489884d179dSJan Kara dquot->dq_sb->dq_op->destroy_dquot(dquot); 490884d179dSJan Kara } 491884d179dSJan Kara 492884d179dSJan Kara /* Invalidate all dquots on the list. Note that this function is called after 493884d179dSJan Kara * quota is disabled and pointers from inodes removed so there cannot be new 494884d179dSJan Kara * quota users. There can still be some users of quotas due to inodes being 495884d179dSJan Kara * just deleted or pruned by prune_icache() (those are not attached to any 496884d179dSJan Kara * list) or parallel quotactl call. We have to wait for such users. 497884d179dSJan Kara */ 498884d179dSJan Kara static void invalidate_dquots(struct super_block *sb, int type) 499884d179dSJan Kara { 500884d179dSJan Kara struct dquot *dquot, *tmp; 501884d179dSJan Kara 502884d179dSJan Kara restart: 503884d179dSJan Kara spin_lock(&dq_list_lock); 504884d179dSJan Kara list_for_each_entry_safe(dquot, tmp, &inuse_list, dq_inuse) { 505884d179dSJan Kara if (dquot->dq_sb != sb) 506884d179dSJan Kara continue; 507884d179dSJan Kara if (dquot->dq_type != type) 508884d179dSJan Kara continue; 509884d179dSJan Kara /* Wait for dquot users */ 510884d179dSJan Kara if (atomic_read(&dquot->dq_count)) { 511884d179dSJan Kara DEFINE_WAIT(wait); 512884d179dSJan Kara 513884d179dSJan Kara atomic_inc(&dquot->dq_count); 514884d179dSJan Kara prepare_to_wait(&dquot->dq_wait_unused, &wait, 515884d179dSJan Kara TASK_UNINTERRUPTIBLE); 516884d179dSJan Kara spin_unlock(&dq_list_lock); 517884d179dSJan Kara /* Once dqput() wakes us up, we know it's time to free 518884d179dSJan Kara * the dquot. 519884d179dSJan Kara * IMPORTANT: we rely on the fact that there is always 520884d179dSJan Kara * at most one process waiting for dquot to free. 521884d179dSJan Kara * Otherwise dq_count would be > 1 and we would never 522884d179dSJan Kara * wake up. 523884d179dSJan Kara */ 524884d179dSJan Kara if (atomic_read(&dquot->dq_count) > 1) 525884d179dSJan Kara schedule(); 526884d179dSJan Kara finish_wait(&dquot->dq_wait_unused, &wait); 527884d179dSJan Kara dqput(dquot); 528884d179dSJan Kara /* At this moment dquot() need not exist (it could be 529884d179dSJan Kara * reclaimed by prune_dqcache(). Hence we must 530884d179dSJan Kara * restart. */ 531884d179dSJan Kara goto restart; 532884d179dSJan Kara } 533884d179dSJan Kara /* 534884d179dSJan Kara * Quota now has no users and it has been written on last 535884d179dSJan Kara * dqput() 536884d179dSJan Kara */ 537884d179dSJan Kara remove_dquot_hash(dquot); 538884d179dSJan Kara remove_free_dquot(dquot); 539884d179dSJan Kara remove_inuse(dquot); 540884d179dSJan Kara do_destroy_dquot(dquot); 541884d179dSJan Kara } 542884d179dSJan Kara spin_unlock(&dq_list_lock); 543884d179dSJan Kara } 544884d179dSJan Kara 545884d179dSJan Kara /* Call callback for every active dquot on given filesystem */ 546884d179dSJan Kara int dquot_scan_active(struct super_block *sb, 547884d179dSJan Kara int (*fn)(struct dquot *dquot, unsigned long priv), 548884d179dSJan Kara unsigned long priv) 549884d179dSJan Kara { 550884d179dSJan Kara struct dquot *dquot, *old_dquot = NULL; 551884d179dSJan Kara int ret = 0; 552884d179dSJan Kara 553884d179dSJan Kara mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); 554884d179dSJan Kara spin_lock(&dq_list_lock); 555884d179dSJan Kara list_for_each_entry(dquot, &inuse_list, dq_inuse) { 556884d179dSJan Kara if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) 557884d179dSJan Kara continue; 558884d179dSJan Kara if (dquot->dq_sb != sb) 559884d179dSJan Kara continue; 560884d179dSJan Kara /* Now we have active dquot so we can just increase use count */ 561884d179dSJan Kara atomic_inc(&dquot->dq_count); 562884d179dSJan Kara dqstats.lookups++; 563884d179dSJan Kara spin_unlock(&dq_list_lock); 564884d179dSJan Kara dqput(old_dquot); 565884d179dSJan Kara old_dquot = dquot; 566884d179dSJan Kara ret = fn(dquot, priv); 567884d179dSJan Kara if (ret < 0) 568884d179dSJan Kara goto out; 569884d179dSJan Kara spin_lock(&dq_list_lock); 570884d179dSJan Kara /* We are safe to continue now because our dquot could not 571884d179dSJan Kara * be moved out of the inuse list while we hold the reference */ 572884d179dSJan Kara } 573884d179dSJan Kara spin_unlock(&dq_list_lock); 574884d179dSJan Kara out: 575884d179dSJan Kara dqput(old_dquot); 576884d179dSJan Kara mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); 577884d179dSJan Kara return ret; 578884d179dSJan Kara } 579884d179dSJan Kara EXPORT_SYMBOL(dquot_scan_active); 580884d179dSJan Kara 5815fb324adSChristoph Hellwig int vfs_quota_sync(struct super_block *sb, int type, int wait) 582884d179dSJan Kara { 583884d179dSJan Kara struct list_head *dirty; 584884d179dSJan Kara struct dquot *dquot; 585884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 586884d179dSJan Kara int cnt; 587884d179dSJan Kara 588884d179dSJan Kara mutex_lock(&dqopt->dqonoff_mutex); 589884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 590884d179dSJan Kara if (type != -1 && cnt != type) 591884d179dSJan Kara continue; 592884d179dSJan Kara if (!sb_has_quota_active(sb, cnt)) 593884d179dSJan Kara continue; 594884d179dSJan Kara spin_lock(&dq_list_lock); 595884d179dSJan Kara dirty = &dqopt->info[cnt].dqi_dirty_list; 596884d179dSJan Kara while (!list_empty(dirty)) { 597268157baSJan Kara dquot = list_first_entry(dirty, struct dquot, 598268157baSJan Kara dq_dirty); 599884d179dSJan Kara /* Dirty and inactive can be only bad dquot... */ 600884d179dSJan Kara if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { 601884d179dSJan Kara clear_dquot_dirty(dquot); 602884d179dSJan Kara continue; 603884d179dSJan Kara } 604884d179dSJan Kara /* Now we have active dquot from which someone is 605884d179dSJan Kara * holding reference so we can safely just increase 606884d179dSJan Kara * use count */ 607884d179dSJan Kara atomic_inc(&dquot->dq_count); 608884d179dSJan Kara dqstats.lookups++; 609884d179dSJan Kara spin_unlock(&dq_list_lock); 610884d179dSJan Kara sb->dq_op->write_dquot(dquot); 611884d179dSJan Kara dqput(dquot); 612884d179dSJan Kara spin_lock(&dq_list_lock); 613884d179dSJan Kara } 614884d179dSJan Kara spin_unlock(&dq_list_lock); 615884d179dSJan Kara } 616884d179dSJan Kara 617884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 618884d179dSJan Kara if ((cnt == type || type == -1) && sb_has_quota_active(sb, cnt) 619884d179dSJan Kara && info_dirty(&dqopt->info[cnt])) 620884d179dSJan Kara sb->dq_op->write_info(sb, cnt); 621884d179dSJan Kara spin_lock(&dq_list_lock); 622884d179dSJan Kara dqstats.syncs++; 623884d179dSJan Kara spin_unlock(&dq_list_lock); 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 } 655884d179dSJan Kara EXPORT_SYMBOL(vfs_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 */ 679884d179dSJan Kara 680884d179dSJan Kara static int shrink_dqcache_memory(int nr, gfp_t gfp_mask) 681884d179dSJan Kara { 682884d179dSJan Kara if (nr) { 683884d179dSJan Kara spin_lock(&dq_list_lock); 684884d179dSJan Kara prune_dqcache(nr); 685884d179dSJan Kara spin_unlock(&dq_list_lock); 686884d179dSJan Kara } 687884d179dSJan Kara return (dqstats.free_dquots / 100) * sysctl_vfs_cache_pressure; 688884d179dSJan Kara } 689884d179dSJan Kara 690884d179dSJan Kara static struct shrinker dqcache_shrinker = { 691884d179dSJan Kara .shrink = shrink_dqcache_memory, 692884d179dSJan Kara .seeks = DEFAULT_SEEKS, 693884d179dSJan Kara }; 694884d179dSJan Kara 695884d179dSJan Kara /* 696884d179dSJan Kara * Put reference to dquot 697884d179dSJan Kara * NOTE: If you change this function please check whether dqput_blocks() works right... 698884d179dSJan Kara */ 699884d179dSJan Kara void dqput(struct dquot *dquot) 700884d179dSJan Kara { 701884d179dSJan Kara int ret; 702884d179dSJan Kara 703884d179dSJan Kara if (!dquot) 704884d179dSJan Kara return; 70562af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 706884d179dSJan Kara if (!atomic_read(&dquot->dq_count)) { 707884d179dSJan Kara printk("VFS: dqput: trying to free free dquot\n"); 708884d179dSJan Kara printk("VFS: device %s, dquot of %s %d\n", 709884d179dSJan Kara dquot->dq_sb->s_id, 710884d179dSJan Kara quotatypes[dquot->dq_type], 711884d179dSJan Kara dquot->dq_id); 712884d179dSJan Kara BUG(); 713884d179dSJan Kara } 714884d179dSJan Kara #endif 715884d179dSJan Kara 716884d179dSJan Kara spin_lock(&dq_list_lock); 717884d179dSJan Kara dqstats.drops++; 718884d179dSJan Kara spin_unlock(&dq_list_lock); 719884d179dSJan Kara we_slept: 720884d179dSJan Kara spin_lock(&dq_list_lock); 721884d179dSJan Kara if (atomic_read(&dquot->dq_count) > 1) { 722884d179dSJan Kara /* We have more than one user... nothing to do */ 723884d179dSJan Kara atomic_dec(&dquot->dq_count); 724884d179dSJan Kara /* Releasing dquot during quotaoff phase? */ 725884d179dSJan Kara if (!sb_has_quota_active(dquot->dq_sb, dquot->dq_type) && 726884d179dSJan Kara atomic_read(&dquot->dq_count) == 1) 727884d179dSJan Kara wake_up(&dquot->dq_wait_unused); 728884d179dSJan Kara spin_unlock(&dq_list_lock); 729884d179dSJan Kara return; 730884d179dSJan Kara } 731884d179dSJan Kara /* Need to release dquot? */ 732884d179dSJan Kara if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && dquot_dirty(dquot)) { 733884d179dSJan Kara spin_unlock(&dq_list_lock); 734884d179dSJan Kara /* Commit dquot before releasing */ 735884d179dSJan Kara ret = dquot->dq_sb->dq_op->write_dquot(dquot); 736884d179dSJan Kara if (ret < 0) { 737884d179dSJan Kara printk(KERN_ERR "VFS: cannot write quota structure on " 738884d179dSJan Kara "device %s (error %d). Quota may get out of " 739884d179dSJan Kara "sync!\n", dquot->dq_sb->s_id, ret); 740884d179dSJan Kara /* 741884d179dSJan Kara * We clear dirty bit anyway, so that we avoid 742884d179dSJan Kara * infinite loop here 743884d179dSJan Kara */ 744884d179dSJan Kara spin_lock(&dq_list_lock); 745884d179dSJan Kara clear_dquot_dirty(dquot); 746884d179dSJan Kara spin_unlock(&dq_list_lock); 747884d179dSJan Kara } 748884d179dSJan Kara goto we_slept; 749884d179dSJan Kara } 750884d179dSJan Kara /* Clear flag in case dquot was inactive (something bad happened) */ 751884d179dSJan Kara clear_dquot_dirty(dquot); 752884d179dSJan Kara if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { 753884d179dSJan Kara spin_unlock(&dq_list_lock); 754884d179dSJan Kara dquot->dq_sb->dq_op->release_dquot(dquot); 755884d179dSJan Kara goto we_slept; 756884d179dSJan Kara } 757884d179dSJan Kara atomic_dec(&dquot->dq_count); 75862af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 759884d179dSJan Kara /* sanity check */ 760884d179dSJan Kara BUG_ON(!list_empty(&dquot->dq_free)); 761884d179dSJan Kara #endif 762884d179dSJan Kara put_dquot_last(dquot); 763884d179dSJan Kara spin_unlock(&dq_list_lock); 764884d179dSJan Kara } 765884d179dSJan Kara EXPORT_SYMBOL(dqput); 766884d179dSJan Kara 767884d179dSJan Kara struct dquot *dquot_alloc(struct super_block *sb, int type) 768884d179dSJan Kara { 769884d179dSJan Kara return kmem_cache_zalloc(dquot_cachep, GFP_NOFS); 770884d179dSJan Kara } 771884d179dSJan Kara EXPORT_SYMBOL(dquot_alloc); 772884d179dSJan Kara 773884d179dSJan Kara static struct dquot *get_empty_dquot(struct super_block *sb, int type) 774884d179dSJan Kara { 775884d179dSJan Kara struct dquot *dquot; 776884d179dSJan Kara 777884d179dSJan Kara dquot = sb->dq_op->alloc_dquot(sb, type); 778884d179dSJan Kara if(!dquot) 779dd6f3c6dSJan Kara return NULL; 780884d179dSJan Kara 781884d179dSJan Kara mutex_init(&dquot->dq_lock); 782884d179dSJan Kara INIT_LIST_HEAD(&dquot->dq_free); 783884d179dSJan Kara INIT_LIST_HEAD(&dquot->dq_inuse); 784884d179dSJan Kara INIT_HLIST_NODE(&dquot->dq_hash); 785884d179dSJan Kara INIT_LIST_HEAD(&dquot->dq_dirty); 786884d179dSJan Kara init_waitqueue_head(&dquot->dq_wait_unused); 787884d179dSJan Kara dquot->dq_sb = sb; 788884d179dSJan Kara dquot->dq_type = type; 789884d179dSJan Kara atomic_set(&dquot->dq_count, 1); 790884d179dSJan Kara 791884d179dSJan Kara return dquot; 792884d179dSJan Kara } 793884d179dSJan Kara 794884d179dSJan Kara /* 795884d179dSJan Kara * Get reference to dquot 796884d179dSJan Kara * 797884d179dSJan Kara * Locking is slightly tricky here. We are guarded from parallel quotaoff() 798884d179dSJan Kara * destroying our dquot by: 799884d179dSJan Kara * a) checking for quota flags under dq_list_lock and 800884d179dSJan Kara * b) getting a reference to dquot before we release dq_list_lock 801884d179dSJan Kara */ 802884d179dSJan Kara struct dquot *dqget(struct super_block *sb, unsigned int id, int type) 803884d179dSJan Kara { 804884d179dSJan Kara unsigned int hashent = hashfn(sb, id, type); 805dd6f3c6dSJan Kara struct dquot *dquot = NULL, *empty = NULL; 806884d179dSJan Kara 807884d179dSJan Kara if (!sb_has_quota_active(sb, type)) 808dd6f3c6dSJan Kara return NULL; 809884d179dSJan Kara we_slept: 810884d179dSJan Kara spin_lock(&dq_list_lock); 811884d179dSJan Kara spin_lock(&dq_state_lock); 812884d179dSJan Kara if (!sb_has_quota_active(sb, type)) { 813884d179dSJan Kara spin_unlock(&dq_state_lock); 814884d179dSJan Kara spin_unlock(&dq_list_lock); 815884d179dSJan Kara goto out; 816884d179dSJan Kara } 817884d179dSJan Kara spin_unlock(&dq_state_lock); 818884d179dSJan Kara 819dd6f3c6dSJan Kara dquot = find_dquot(hashent, sb, id, type); 820dd6f3c6dSJan Kara if (!dquot) { 821dd6f3c6dSJan Kara if (!empty) { 822884d179dSJan Kara spin_unlock(&dq_list_lock); 823dd6f3c6dSJan Kara empty = get_empty_dquot(sb, type); 824dd6f3c6dSJan Kara if (!empty) 825884d179dSJan Kara schedule(); /* Try to wait for a moment... */ 826884d179dSJan Kara goto we_slept; 827884d179dSJan Kara } 828884d179dSJan Kara dquot = empty; 829dd6f3c6dSJan Kara empty = NULL; 830884d179dSJan Kara dquot->dq_id = id; 831884d179dSJan Kara /* all dquots go on the inuse_list */ 832884d179dSJan Kara put_inuse(dquot); 833884d179dSJan Kara /* hash it first so it can be found */ 834884d179dSJan Kara insert_dquot_hash(dquot); 835884d179dSJan Kara dqstats.lookups++; 836884d179dSJan Kara spin_unlock(&dq_list_lock); 837884d179dSJan Kara } else { 838884d179dSJan Kara if (!atomic_read(&dquot->dq_count)) 839884d179dSJan Kara remove_free_dquot(dquot); 840884d179dSJan Kara atomic_inc(&dquot->dq_count); 841884d179dSJan Kara dqstats.cache_hits++; 842884d179dSJan Kara dqstats.lookups++; 843884d179dSJan Kara spin_unlock(&dq_list_lock); 844884d179dSJan Kara } 845268157baSJan Kara /* Wait for dq_lock - after this we know that either dquot_release() is 846268157baSJan Kara * already finished or it will be canceled due to dq_count > 1 test */ 847884d179dSJan Kara wait_on_dquot(dquot); 848268157baSJan Kara /* Read the dquot / allocate space in quota file */ 849268157baSJan Kara if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && 850268157baSJan Kara sb->dq_op->acquire_dquot(dquot) < 0) { 851884d179dSJan Kara dqput(dquot); 852dd6f3c6dSJan Kara dquot = NULL; 853884d179dSJan Kara goto out; 854884d179dSJan Kara } 85562af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 856884d179dSJan Kara BUG_ON(!dquot->dq_sb); /* Has somebody invalidated entry under us? */ 857884d179dSJan Kara #endif 858884d179dSJan Kara out: 859884d179dSJan Kara if (empty) 860884d179dSJan Kara do_destroy_dquot(empty); 861884d179dSJan Kara 862884d179dSJan Kara return dquot; 863884d179dSJan Kara } 864884d179dSJan Kara EXPORT_SYMBOL(dqget); 865884d179dSJan Kara 866884d179dSJan Kara static int dqinit_needed(struct inode *inode, int type) 867884d179dSJan Kara { 868884d179dSJan Kara int cnt; 869884d179dSJan Kara 870884d179dSJan Kara if (IS_NOQUOTA(inode)) 871884d179dSJan Kara return 0; 872884d179dSJan Kara if (type != -1) 873dd6f3c6dSJan Kara return !inode->i_dquot[type]; 874884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 875dd6f3c6dSJan Kara if (!inode->i_dquot[cnt]) 876884d179dSJan Kara return 1; 877884d179dSJan Kara return 0; 878884d179dSJan Kara } 879884d179dSJan Kara 880884d179dSJan Kara /* This routine is guarded by dqonoff_mutex mutex */ 881884d179dSJan Kara static void add_dquot_ref(struct super_block *sb, int type) 882884d179dSJan Kara { 883884d179dSJan Kara struct inode *inode, *old_inode = NULL; 88462af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 8850a5a9c72SJan Kara int reserved = 0; 8864c5e6c0eSJan Kara #endif 887884d179dSJan Kara 888884d179dSJan Kara spin_lock(&inode_lock); 889884d179dSJan Kara list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { 890b6fac63cSWu Fengguang if (inode->i_state & (I_FREEING|I_CLEAR|I_WILL_FREE|I_NEW)) 8913ae5080fSLinus Torvalds continue; 89262af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 8930a5a9c72SJan Kara if (unlikely(inode_get_rsv_space(inode) > 0)) 8940a5a9c72SJan Kara reserved = 1; 8954c5e6c0eSJan Kara #endif 896884d179dSJan Kara if (!atomic_read(&inode->i_writecount)) 897884d179dSJan Kara continue; 898884d179dSJan Kara if (!dqinit_needed(inode, type)) 899884d179dSJan Kara continue; 900884d179dSJan Kara 901884d179dSJan Kara __iget(inode); 902884d179dSJan Kara spin_unlock(&inode_lock); 903884d179dSJan Kara 904884d179dSJan Kara iput(old_inode); 905871a2931SChristoph Hellwig __dquot_initialize(inode, type); 906884d179dSJan Kara /* We hold a reference to 'inode' so it couldn't have been 907884d179dSJan Kara * removed from s_inodes list while we dropped the inode_lock. 908884d179dSJan Kara * We cannot iput the inode now as we can be holding the last 909884d179dSJan Kara * reference and we cannot iput it under inode_lock. So we 910884d179dSJan Kara * keep the reference and iput it later. */ 911884d179dSJan Kara old_inode = inode; 912884d179dSJan Kara spin_lock(&inode_lock); 913884d179dSJan Kara } 914884d179dSJan Kara spin_unlock(&inode_lock); 915884d179dSJan Kara iput(old_inode); 9160a5a9c72SJan Kara 91762af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 9180a5a9c72SJan Kara if (reserved) { 9190a5a9c72SJan Kara printk(KERN_WARNING "VFS (%s): Writes happened before quota" 9200a5a9c72SJan Kara " was turned on thus quota information is probably " 9210a5a9c72SJan Kara "inconsistent. Please run quotacheck(8).\n", sb->s_id); 9220a5a9c72SJan Kara } 9234c5e6c0eSJan Kara #endif 924884d179dSJan Kara } 925884d179dSJan Kara 926268157baSJan Kara /* 927268157baSJan Kara * Return 0 if dqput() won't block. 928268157baSJan Kara * (note that 1 doesn't necessarily mean blocking) 929268157baSJan Kara */ 930884d179dSJan Kara static inline int dqput_blocks(struct dquot *dquot) 931884d179dSJan Kara { 932884d179dSJan Kara if (atomic_read(&dquot->dq_count) <= 1) 933884d179dSJan Kara return 1; 934884d179dSJan Kara return 0; 935884d179dSJan Kara } 936884d179dSJan Kara 937268157baSJan Kara /* 938268157baSJan Kara * Remove references to dquots from inode and add dquot to list for freeing 939268157baSJan Kara * if we have the last referece to dquot 940268157baSJan Kara * We can't race with anybody because we hold dqptr_sem for writing... 941268157baSJan Kara */ 942884d179dSJan Kara static int remove_inode_dquot_ref(struct inode *inode, int type, 943884d179dSJan Kara struct list_head *tofree_head) 944884d179dSJan Kara { 945884d179dSJan Kara struct dquot *dquot = inode->i_dquot[type]; 946884d179dSJan Kara 947dd6f3c6dSJan Kara inode->i_dquot[type] = NULL; 948dd6f3c6dSJan Kara if (dquot) { 949884d179dSJan Kara if (dqput_blocks(dquot)) { 95062af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 951884d179dSJan Kara if (atomic_read(&dquot->dq_count) != 1) 952884d179dSJan Kara printk(KERN_WARNING "VFS: Adding dquot with dq_count %d to dispose list.\n", atomic_read(&dquot->dq_count)); 953884d179dSJan Kara #endif 954884d179dSJan Kara spin_lock(&dq_list_lock); 955268157baSJan Kara /* As dquot must have currently users it can't be on 956268157baSJan Kara * the free list... */ 957268157baSJan Kara list_add(&dquot->dq_free, tofree_head); 958884d179dSJan Kara spin_unlock(&dq_list_lock); 959884d179dSJan Kara return 1; 960884d179dSJan Kara } 961884d179dSJan Kara else 962884d179dSJan Kara dqput(dquot); /* We have guaranteed we won't block */ 963884d179dSJan Kara } 964884d179dSJan Kara return 0; 965884d179dSJan Kara } 966884d179dSJan Kara 967268157baSJan Kara /* 968268157baSJan Kara * Free list of dquots 969268157baSJan Kara * Dquots are removed from inodes and no new references can be got so we are 970268157baSJan Kara * the only ones holding reference 971268157baSJan Kara */ 972884d179dSJan Kara static void put_dquot_list(struct list_head *tofree_head) 973884d179dSJan Kara { 974884d179dSJan Kara struct list_head *act_head; 975884d179dSJan Kara struct dquot *dquot; 976884d179dSJan Kara 977884d179dSJan Kara act_head = tofree_head->next; 978884d179dSJan Kara while (act_head != tofree_head) { 979884d179dSJan Kara dquot = list_entry(act_head, struct dquot, dq_free); 980884d179dSJan Kara act_head = act_head->next; 981268157baSJan Kara /* Remove dquot from the list so we won't have problems... */ 982268157baSJan Kara list_del_init(&dquot->dq_free); 983884d179dSJan Kara dqput(dquot); 984884d179dSJan Kara } 985884d179dSJan Kara } 986884d179dSJan Kara 987884d179dSJan Kara static void remove_dquot_ref(struct super_block *sb, int type, 988884d179dSJan Kara struct list_head *tofree_head) 989884d179dSJan Kara { 990884d179dSJan Kara struct inode *inode; 991884d179dSJan Kara 992884d179dSJan Kara spin_lock(&inode_lock); 993884d179dSJan Kara list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { 9943ae5080fSLinus Torvalds /* 9953ae5080fSLinus Torvalds * We have to scan also I_NEW inodes because they can already 9963ae5080fSLinus Torvalds * have quota pointer initialized. Luckily, we need to touch 9973ae5080fSLinus Torvalds * only quota pointers and these have separate locking 9983ae5080fSLinus Torvalds * (dqptr_sem). 9993ae5080fSLinus Torvalds */ 1000884d179dSJan Kara if (!IS_NOQUOTA(inode)) 1001884d179dSJan Kara remove_inode_dquot_ref(inode, type, tofree_head); 1002884d179dSJan Kara } 1003884d179dSJan Kara spin_unlock(&inode_lock); 1004884d179dSJan Kara } 1005884d179dSJan Kara 1006884d179dSJan Kara /* Gather all references from inodes and drop them */ 1007884d179dSJan Kara static void drop_dquot_ref(struct super_block *sb, int type) 1008884d179dSJan Kara { 1009884d179dSJan Kara LIST_HEAD(tofree_head); 1010884d179dSJan Kara 1011884d179dSJan Kara if (sb->dq_op) { 1012884d179dSJan Kara down_write(&sb_dqopt(sb)->dqptr_sem); 1013884d179dSJan Kara remove_dquot_ref(sb, type, &tofree_head); 1014884d179dSJan Kara up_write(&sb_dqopt(sb)->dqptr_sem); 1015884d179dSJan Kara put_dquot_list(&tofree_head); 1016884d179dSJan Kara } 1017884d179dSJan Kara } 1018884d179dSJan Kara 1019884d179dSJan Kara static inline void dquot_incr_inodes(struct dquot *dquot, qsize_t number) 1020884d179dSJan Kara { 1021884d179dSJan Kara dquot->dq_dqb.dqb_curinodes += number; 1022884d179dSJan Kara } 1023884d179dSJan Kara 1024884d179dSJan Kara static inline void dquot_incr_space(struct dquot *dquot, qsize_t number) 1025884d179dSJan Kara { 1026884d179dSJan Kara dquot->dq_dqb.dqb_curspace += number; 1027884d179dSJan Kara } 1028884d179dSJan Kara 1029884d179dSJan Kara static inline void dquot_resv_space(struct dquot *dquot, qsize_t number) 1030884d179dSJan Kara { 1031884d179dSJan Kara dquot->dq_dqb.dqb_rsvspace += number; 1032884d179dSJan Kara } 1033884d179dSJan Kara 1034884d179dSJan Kara /* 1035884d179dSJan Kara * Claim reserved quota space 1036884d179dSJan Kara */ 10370a5a9c72SJan Kara static void dquot_claim_reserved_space(struct dquot *dquot, qsize_t number) 1038884d179dSJan Kara { 10390a5a9c72SJan Kara if (dquot->dq_dqb.dqb_rsvspace < number) { 10400a5a9c72SJan Kara WARN_ON_ONCE(1); 10410a5a9c72SJan Kara number = dquot->dq_dqb.dqb_rsvspace; 10420a5a9c72SJan Kara } 1043884d179dSJan Kara dquot->dq_dqb.dqb_curspace += number; 1044884d179dSJan Kara dquot->dq_dqb.dqb_rsvspace -= number; 1045884d179dSJan Kara } 1046884d179dSJan Kara 1047884d179dSJan Kara static inline 1048884d179dSJan Kara void dquot_free_reserved_space(struct dquot *dquot, qsize_t number) 1049884d179dSJan Kara { 10500a5a9c72SJan Kara if (dquot->dq_dqb.dqb_rsvspace >= number) 1051884d179dSJan Kara dquot->dq_dqb.dqb_rsvspace -= number; 10520a5a9c72SJan Kara else { 10530a5a9c72SJan Kara WARN_ON_ONCE(1); 10540a5a9c72SJan Kara dquot->dq_dqb.dqb_rsvspace = 0; 10550a5a9c72SJan Kara } 1056884d179dSJan Kara } 1057884d179dSJan Kara 10587a2435d8SJan Kara static void dquot_decr_inodes(struct dquot *dquot, qsize_t number) 1059884d179dSJan Kara { 1060884d179dSJan Kara if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE || 1061884d179dSJan Kara dquot->dq_dqb.dqb_curinodes >= number) 1062884d179dSJan Kara dquot->dq_dqb.dqb_curinodes -= number; 1063884d179dSJan Kara else 1064884d179dSJan Kara dquot->dq_dqb.dqb_curinodes = 0; 1065884d179dSJan Kara if (dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit) 1066884d179dSJan Kara dquot->dq_dqb.dqb_itime = (time_t) 0; 1067884d179dSJan Kara clear_bit(DQ_INODES_B, &dquot->dq_flags); 1068884d179dSJan Kara } 1069884d179dSJan Kara 10707a2435d8SJan Kara static void dquot_decr_space(struct dquot *dquot, qsize_t number) 1071884d179dSJan Kara { 1072884d179dSJan Kara if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE || 1073884d179dSJan Kara dquot->dq_dqb.dqb_curspace >= number) 1074884d179dSJan Kara dquot->dq_dqb.dqb_curspace -= number; 1075884d179dSJan Kara else 1076884d179dSJan Kara dquot->dq_dqb.dqb_curspace = 0; 1077884d179dSJan Kara if (dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit) 1078884d179dSJan Kara dquot->dq_dqb.dqb_btime = (time_t) 0; 1079884d179dSJan Kara clear_bit(DQ_BLKS_B, &dquot->dq_flags); 1080884d179dSJan Kara } 1081884d179dSJan Kara 1082884d179dSJan Kara static int warning_issued(struct dquot *dquot, const int warntype) 1083884d179dSJan Kara { 1084884d179dSJan Kara int flag = (warntype == QUOTA_NL_BHARDWARN || 1085884d179dSJan Kara warntype == QUOTA_NL_BSOFTLONGWARN) ? DQ_BLKS_B : 1086884d179dSJan Kara ((warntype == QUOTA_NL_IHARDWARN || 1087884d179dSJan Kara warntype == QUOTA_NL_ISOFTLONGWARN) ? DQ_INODES_B : 0); 1088884d179dSJan Kara 1089884d179dSJan Kara if (!flag) 1090884d179dSJan Kara return 0; 1091884d179dSJan Kara return test_and_set_bit(flag, &dquot->dq_flags); 1092884d179dSJan Kara } 1093884d179dSJan Kara 1094884d179dSJan Kara #ifdef CONFIG_PRINT_QUOTA_WARNING 1095884d179dSJan Kara static int flag_print_warnings = 1; 1096884d179dSJan Kara 10977a2435d8SJan Kara static int need_print_warning(struct dquot *dquot) 1098884d179dSJan Kara { 1099884d179dSJan Kara if (!flag_print_warnings) 1100884d179dSJan Kara return 0; 1101884d179dSJan Kara 1102884d179dSJan Kara switch (dquot->dq_type) { 1103884d179dSJan Kara case USRQUOTA: 1104884d179dSJan Kara return current_fsuid() == dquot->dq_id; 1105884d179dSJan Kara case GRPQUOTA: 1106884d179dSJan Kara return in_group_p(dquot->dq_id); 1107884d179dSJan Kara } 1108884d179dSJan Kara return 0; 1109884d179dSJan Kara } 1110884d179dSJan Kara 1111884d179dSJan Kara /* Print warning to user which exceeded quota */ 1112884d179dSJan Kara static void print_warning(struct dquot *dquot, const int warntype) 1113884d179dSJan Kara { 1114884d179dSJan Kara char *msg = NULL; 1115884d179dSJan Kara struct tty_struct *tty; 1116884d179dSJan Kara 1117884d179dSJan Kara if (warntype == QUOTA_NL_IHARDBELOW || 1118884d179dSJan Kara warntype == QUOTA_NL_ISOFTBELOW || 1119884d179dSJan Kara warntype == QUOTA_NL_BHARDBELOW || 1120884d179dSJan Kara warntype == QUOTA_NL_BSOFTBELOW || !need_print_warning(dquot)) 1121884d179dSJan Kara return; 1122884d179dSJan Kara 1123884d179dSJan Kara tty = get_current_tty(); 1124884d179dSJan Kara if (!tty) 1125884d179dSJan Kara return; 1126884d179dSJan Kara tty_write_message(tty, dquot->dq_sb->s_id); 1127884d179dSJan Kara if (warntype == QUOTA_NL_ISOFTWARN || warntype == QUOTA_NL_BSOFTWARN) 1128884d179dSJan Kara tty_write_message(tty, ": warning, "); 1129884d179dSJan Kara else 1130884d179dSJan Kara tty_write_message(tty, ": write failed, "); 1131884d179dSJan Kara tty_write_message(tty, quotatypes[dquot->dq_type]); 1132884d179dSJan Kara switch (warntype) { 1133884d179dSJan Kara case QUOTA_NL_IHARDWARN: 1134884d179dSJan Kara msg = " file limit reached.\r\n"; 1135884d179dSJan Kara break; 1136884d179dSJan Kara case QUOTA_NL_ISOFTLONGWARN: 1137884d179dSJan Kara msg = " file quota exceeded too long.\r\n"; 1138884d179dSJan Kara break; 1139884d179dSJan Kara case QUOTA_NL_ISOFTWARN: 1140884d179dSJan Kara msg = " file quota exceeded.\r\n"; 1141884d179dSJan Kara break; 1142884d179dSJan Kara case QUOTA_NL_BHARDWARN: 1143884d179dSJan Kara msg = " block limit reached.\r\n"; 1144884d179dSJan Kara break; 1145884d179dSJan Kara case QUOTA_NL_BSOFTLONGWARN: 1146884d179dSJan Kara msg = " block quota exceeded too long.\r\n"; 1147884d179dSJan Kara break; 1148884d179dSJan Kara case QUOTA_NL_BSOFTWARN: 1149884d179dSJan Kara msg = " block quota exceeded.\r\n"; 1150884d179dSJan Kara break; 1151884d179dSJan Kara } 1152884d179dSJan Kara tty_write_message(tty, msg); 1153884d179dSJan Kara tty_kref_put(tty); 1154884d179dSJan Kara } 1155884d179dSJan Kara #endif 1156884d179dSJan Kara 1157884d179dSJan Kara /* 1158884d179dSJan Kara * Write warnings to the console and send warning messages over netlink. 1159884d179dSJan Kara * 1160884d179dSJan Kara * Note that this function can sleep. 1161884d179dSJan Kara */ 11627a2435d8SJan Kara static void flush_warnings(struct dquot *const *dquots, char *warntype) 1163884d179dSJan Kara { 116486e931a3SSteven Whitehouse struct dquot *dq; 1165884d179dSJan Kara int i; 1166884d179dSJan Kara 116786e931a3SSteven Whitehouse for (i = 0; i < MAXQUOTAS; i++) { 116886e931a3SSteven Whitehouse dq = dquots[i]; 116986e931a3SSteven Whitehouse if (dq && warntype[i] != QUOTA_NL_NOWARN && 117086e931a3SSteven Whitehouse !warning_issued(dq, warntype[i])) { 1171884d179dSJan Kara #ifdef CONFIG_PRINT_QUOTA_WARNING 117286e931a3SSteven Whitehouse print_warning(dq, warntype[i]); 1173884d179dSJan Kara #endif 117486e931a3SSteven Whitehouse quota_send_warning(dq->dq_type, dq->dq_id, 117586e931a3SSteven Whitehouse dq->dq_sb->s_dev, warntype[i]); 117686e931a3SSteven Whitehouse } 1177884d179dSJan Kara } 1178884d179dSJan Kara } 1179884d179dSJan Kara 11807a2435d8SJan Kara static int ignore_hardlimit(struct dquot *dquot) 1181884d179dSJan Kara { 1182884d179dSJan Kara struct mem_dqinfo *info = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_type]; 1183884d179dSJan Kara 1184884d179dSJan Kara return capable(CAP_SYS_RESOURCE) && 1185268157baSJan Kara (info->dqi_format->qf_fmt_id != QFMT_VFS_OLD || 1186268157baSJan Kara !(info->dqi_flags & V1_DQF_RSQUASH)); 1187884d179dSJan Kara } 1188884d179dSJan Kara 1189884d179dSJan Kara /* needs dq_data_lock */ 1190884d179dSJan Kara static int check_idq(struct dquot *dquot, qsize_t inodes, char *warntype) 1191884d179dSJan Kara { 1192268157baSJan Kara qsize_t newinodes = dquot->dq_dqb.dqb_curinodes + inodes; 1193268157baSJan Kara 1194884d179dSJan Kara *warntype = QUOTA_NL_NOWARN; 1195884d179dSJan Kara if (!sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_type) || 1196884d179dSJan Kara test_bit(DQ_FAKE_B, &dquot->dq_flags)) 1197efd8f0e6SChristoph Hellwig return 0; 1198884d179dSJan Kara 1199884d179dSJan Kara if (dquot->dq_dqb.dqb_ihardlimit && 1200268157baSJan Kara newinodes > dquot->dq_dqb.dqb_ihardlimit && 1201884d179dSJan Kara !ignore_hardlimit(dquot)) { 1202884d179dSJan Kara *warntype = QUOTA_NL_IHARDWARN; 1203efd8f0e6SChristoph Hellwig return -EDQUOT; 1204884d179dSJan Kara } 1205884d179dSJan Kara 1206884d179dSJan Kara if (dquot->dq_dqb.dqb_isoftlimit && 1207268157baSJan Kara newinodes > dquot->dq_dqb.dqb_isoftlimit && 1208268157baSJan Kara dquot->dq_dqb.dqb_itime && 1209268157baSJan Kara get_seconds() >= dquot->dq_dqb.dqb_itime && 1210884d179dSJan Kara !ignore_hardlimit(dquot)) { 1211884d179dSJan Kara *warntype = QUOTA_NL_ISOFTLONGWARN; 1212efd8f0e6SChristoph Hellwig return -EDQUOT; 1213884d179dSJan Kara } 1214884d179dSJan Kara 1215884d179dSJan Kara if (dquot->dq_dqb.dqb_isoftlimit && 1216268157baSJan Kara newinodes > dquot->dq_dqb.dqb_isoftlimit && 1217884d179dSJan Kara dquot->dq_dqb.dqb_itime == 0) { 1218884d179dSJan Kara *warntype = QUOTA_NL_ISOFTWARN; 1219268157baSJan Kara dquot->dq_dqb.dqb_itime = get_seconds() + 1220268157baSJan Kara sb_dqopt(dquot->dq_sb)->info[dquot->dq_type].dqi_igrace; 1221884d179dSJan Kara } 1222884d179dSJan Kara 1223efd8f0e6SChristoph Hellwig return 0; 1224884d179dSJan Kara } 1225884d179dSJan Kara 1226884d179dSJan Kara /* needs dq_data_lock */ 1227884d179dSJan Kara static int check_bdq(struct dquot *dquot, qsize_t space, int prealloc, char *warntype) 1228884d179dSJan Kara { 1229884d179dSJan Kara qsize_t tspace; 1230268157baSJan Kara struct super_block *sb = dquot->dq_sb; 1231884d179dSJan Kara 1232884d179dSJan Kara *warntype = QUOTA_NL_NOWARN; 1233268157baSJan Kara if (!sb_has_quota_limits_enabled(sb, dquot->dq_type) || 1234884d179dSJan Kara test_bit(DQ_FAKE_B, &dquot->dq_flags)) 1235efd8f0e6SChristoph Hellwig return 0; 1236884d179dSJan Kara 1237884d179dSJan Kara tspace = dquot->dq_dqb.dqb_curspace + dquot->dq_dqb.dqb_rsvspace 1238884d179dSJan Kara + space; 1239884d179dSJan Kara 1240884d179dSJan Kara if (dquot->dq_dqb.dqb_bhardlimit && 1241884d179dSJan Kara tspace > dquot->dq_dqb.dqb_bhardlimit && 1242884d179dSJan Kara !ignore_hardlimit(dquot)) { 1243884d179dSJan Kara if (!prealloc) 1244884d179dSJan Kara *warntype = QUOTA_NL_BHARDWARN; 1245efd8f0e6SChristoph Hellwig return -EDQUOT; 1246884d179dSJan Kara } 1247884d179dSJan Kara 1248884d179dSJan Kara if (dquot->dq_dqb.dqb_bsoftlimit && 1249884d179dSJan Kara tspace > dquot->dq_dqb.dqb_bsoftlimit && 1250268157baSJan Kara dquot->dq_dqb.dqb_btime && 1251268157baSJan Kara get_seconds() >= dquot->dq_dqb.dqb_btime && 1252884d179dSJan Kara !ignore_hardlimit(dquot)) { 1253884d179dSJan Kara if (!prealloc) 1254884d179dSJan Kara *warntype = QUOTA_NL_BSOFTLONGWARN; 1255efd8f0e6SChristoph Hellwig return -EDQUOT; 1256884d179dSJan Kara } 1257884d179dSJan Kara 1258884d179dSJan Kara if (dquot->dq_dqb.dqb_bsoftlimit && 1259884d179dSJan Kara tspace > dquot->dq_dqb.dqb_bsoftlimit && 1260884d179dSJan Kara dquot->dq_dqb.dqb_btime == 0) { 1261884d179dSJan Kara if (!prealloc) { 1262884d179dSJan Kara *warntype = QUOTA_NL_BSOFTWARN; 1263268157baSJan Kara dquot->dq_dqb.dqb_btime = get_seconds() + 1264268157baSJan Kara sb_dqopt(sb)->info[dquot->dq_type].dqi_bgrace; 1265884d179dSJan Kara } 1266884d179dSJan Kara else 1267884d179dSJan Kara /* 1268884d179dSJan Kara * We don't allow preallocation to exceed softlimit so exceeding will 1269884d179dSJan Kara * be always printed 1270884d179dSJan Kara */ 1271efd8f0e6SChristoph Hellwig return -EDQUOT; 1272884d179dSJan Kara } 1273884d179dSJan Kara 1274efd8f0e6SChristoph Hellwig return 0; 1275884d179dSJan Kara } 1276884d179dSJan Kara 1277884d179dSJan Kara static int info_idq_free(struct dquot *dquot, qsize_t inodes) 1278884d179dSJan Kara { 1279268157baSJan Kara qsize_t newinodes; 1280268157baSJan Kara 1281884d179dSJan Kara if (test_bit(DQ_FAKE_B, &dquot->dq_flags) || 1282884d179dSJan Kara dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit || 1283884d179dSJan Kara !sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_type)) 1284884d179dSJan Kara return QUOTA_NL_NOWARN; 1285884d179dSJan Kara 1286268157baSJan Kara newinodes = dquot->dq_dqb.dqb_curinodes - inodes; 1287268157baSJan Kara if (newinodes <= dquot->dq_dqb.dqb_isoftlimit) 1288884d179dSJan Kara return QUOTA_NL_ISOFTBELOW; 1289884d179dSJan Kara if (dquot->dq_dqb.dqb_curinodes >= dquot->dq_dqb.dqb_ihardlimit && 1290268157baSJan Kara newinodes < dquot->dq_dqb.dqb_ihardlimit) 1291884d179dSJan Kara return QUOTA_NL_IHARDBELOW; 1292884d179dSJan Kara return QUOTA_NL_NOWARN; 1293884d179dSJan Kara } 1294884d179dSJan Kara 1295884d179dSJan Kara static int info_bdq_free(struct dquot *dquot, qsize_t space) 1296884d179dSJan Kara { 1297884d179dSJan Kara if (test_bit(DQ_FAKE_B, &dquot->dq_flags) || 1298884d179dSJan Kara dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit) 1299884d179dSJan Kara return QUOTA_NL_NOWARN; 1300884d179dSJan Kara 1301884d179dSJan Kara if (dquot->dq_dqb.dqb_curspace - space <= dquot->dq_dqb.dqb_bsoftlimit) 1302884d179dSJan Kara return QUOTA_NL_BSOFTBELOW; 1303884d179dSJan Kara if (dquot->dq_dqb.dqb_curspace >= dquot->dq_dqb.dqb_bhardlimit && 1304884d179dSJan Kara dquot->dq_dqb.dqb_curspace - space < dquot->dq_dqb.dqb_bhardlimit) 1305884d179dSJan Kara return QUOTA_NL_BHARDBELOW; 1306884d179dSJan Kara return QUOTA_NL_NOWARN; 1307884d179dSJan Kara } 13080a5a9c72SJan Kara 1309884d179dSJan Kara /* 1310884d179dSJan Kara * Initialize quota pointers in inode 1311871a2931SChristoph Hellwig * 1312884d179dSJan Kara * We do things in a bit complicated way but by that we avoid calling 1313884d179dSJan Kara * dqget() and thus filesystem callbacks under dqptr_sem. 1314871a2931SChristoph Hellwig * 1315871a2931SChristoph Hellwig * It is better to call this function outside of any transaction as it 1316871a2931SChristoph Hellwig * might need a lot of space in journal for dquot structure allocation. 1317884d179dSJan Kara */ 1318871a2931SChristoph Hellwig static void __dquot_initialize(struct inode *inode, int type) 1319884d179dSJan Kara { 1320884d179dSJan Kara unsigned int id = 0; 1321871a2931SChristoph Hellwig int cnt; 1322ad1e6e8dSDmitry Monakhov struct dquot *got[MAXQUOTAS]; 1323884d179dSJan Kara struct super_block *sb = inode->i_sb; 13240a5a9c72SJan Kara qsize_t rsv; 1325884d179dSJan Kara 1326884d179dSJan Kara /* First test before acquiring mutex - solves deadlocks when we 1327884d179dSJan Kara * re-enter the quota code and are already holding the mutex */ 1328871a2931SChristoph Hellwig if (!sb_any_quota_active(inode->i_sb) || IS_NOQUOTA(inode)) 1329871a2931SChristoph Hellwig return; 1330884d179dSJan Kara 1331884d179dSJan Kara /* First get references to structures we might need. */ 1332884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1333ad1e6e8dSDmitry Monakhov got[cnt] = NULL; 1334884d179dSJan Kara if (type != -1 && cnt != type) 1335884d179dSJan Kara continue; 1336884d179dSJan Kara switch (cnt) { 1337884d179dSJan Kara case USRQUOTA: 1338884d179dSJan Kara id = inode->i_uid; 1339884d179dSJan Kara break; 1340884d179dSJan Kara case GRPQUOTA: 1341884d179dSJan Kara id = inode->i_gid; 1342884d179dSJan Kara break; 1343884d179dSJan Kara } 1344884d179dSJan Kara got[cnt] = dqget(sb, id, cnt); 1345884d179dSJan Kara } 1346884d179dSJan Kara 1347884d179dSJan Kara down_write(&sb_dqopt(sb)->dqptr_sem); 1348884d179dSJan Kara if (IS_NOQUOTA(inode)) 1349884d179dSJan Kara goto out_err; 1350884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1351884d179dSJan Kara if (type != -1 && cnt != type) 1352884d179dSJan Kara continue; 1353884d179dSJan Kara /* Avoid races with quotaoff() */ 1354884d179dSJan Kara if (!sb_has_quota_active(sb, cnt)) 1355884d179dSJan Kara continue; 1356dd6f3c6dSJan Kara if (!inode->i_dquot[cnt]) { 1357884d179dSJan Kara inode->i_dquot[cnt] = got[cnt]; 1358dd6f3c6dSJan Kara got[cnt] = NULL; 13590a5a9c72SJan Kara /* 13600a5a9c72SJan Kara * Make quota reservation system happy if someone 13610a5a9c72SJan Kara * did a write before quota was turned on 13620a5a9c72SJan Kara */ 13630a5a9c72SJan Kara rsv = inode_get_rsv_space(inode); 13640a5a9c72SJan Kara if (unlikely(rsv)) 13650a5a9c72SJan Kara dquot_resv_space(inode->i_dquot[cnt], rsv); 1366884d179dSJan Kara } 1367884d179dSJan Kara } 1368884d179dSJan Kara out_err: 1369884d179dSJan Kara up_write(&sb_dqopt(sb)->dqptr_sem); 1370884d179dSJan Kara /* Drop unused references */ 1371dc52dd3aSDmitry Monakhov dqput_all(got); 1372871a2931SChristoph Hellwig } 1373871a2931SChristoph Hellwig 1374871a2931SChristoph Hellwig void dquot_initialize(struct inode *inode) 1375871a2931SChristoph Hellwig { 1376871a2931SChristoph Hellwig __dquot_initialize(inode, -1); 1377884d179dSJan Kara } 1378884d179dSJan Kara EXPORT_SYMBOL(dquot_initialize); 1379884d179dSJan Kara 1380884d179dSJan Kara /* 1381884d179dSJan Kara * Release all quotas referenced by inode 1382884d179dSJan Kara */ 13839f754758SChristoph Hellwig static void __dquot_drop(struct inode *inode) 1384884d179dSJan Kara { 1385884d179dSJan Kara int cnt; 1386884d179dSJan Kara struct dquot *put[MAXQUOTAS]; 1387884d179dSJan Kara 1388884d179dSJan Kara down_write(&sb_dqopt(inode->i_sb)->dqptr_sem); 1389884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1390884d179dSJan Kara put[cnt] = inode->i_dquot[cnt]; 1391dd6f3c6dSJan Kara inode->i_dquot[cnt] = NULL; 1392884d179dSJan Kara } 1393884d179dSJan Kara up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); 1394dc52dd3aSDmitry Monakhov dqput_all(put); 1395884d179dSJan Kara } 1396884d179dSJan Kara 13979f754758SChristoph Hellwig void dquot_drop(struct inode *inode) 1398884d179dSJan Kara { 1399884d179dSJan Kara int cnt; 14009f754758SChristoph Hellwig 14019f754758SChristoph Hellwig if (IS_NOQUOTA(inode)) 14029f754758SChristoph Hellwig return; 14039f754758SChristoph Hellwig 14049f754758SChristoph Hellwig /* 14059f754758SChristoph Hellwig * Test before calling to rule out calls from proc and such 1406884d179dSJan Kara * where we are not allowed to block. Note that this is 1407884d179dSJan Kara * actually reliable test even without the lock - the caller 1408884d179dSJan Kara * must assure that nobody can come after the DQUOT_DROP and 14099f754758SChristoph Hellwig * add quota pointers back anyway. 14109f754758SChristoph Hellwig */ 14119f754758SChristoph Hellwig for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1412dd6f3c6dSJan Kara if (inode->i_dquot[cnt]) 1413884d179dSJan Kara break; 14149f754758SChristoph Hellwig } 14159f754758SChristoph Hellwig 1416884d179dSJan Kara if (cnt < MAXQUOTAS) 14179f754758SChristoph Hellwig __dquot_drop(inode); 1418884d179dSJan Kara } 14199f754758SChristoph Hellwig EXPORT_SYMBOL(dquot_drop); 1420884d179dSJan Kara 1421884d179dSJan Kara /* 1422fd8fbfc1SDmitry Monakhov * inode_reserved_space is managed internally by quota, and protected by 1423fd8fbfc1SDmitry Monakhov * i_lock similar to i_blocks+i_bytes. 1424fd8fbfc1SDmitry Monakhov */ 1425fd8fbfc1SDmitry Monakhov static qsize_t *inode_reserved_space(struct inode * inode) 1426fd8fbfc1SDmitry Monakhov { 1427fd8fbfc1SDmitry Monakhov /* Filesystem must explicitly define it's own method in order to use 1428fd8fbfc1SDmitry Monakhov * quota reservation interface */ 1429fd8fbfc1SDmitry Monakhov BUG_ON(!inode->i_sb->dq_op->get_reserved_space); 1430fd8fbfc1SDmitry Monakhov return inode->i_sb->dq_op->get_reserved_space(inode); 1431fd8fbfc1SDmitry Monakhov } 1432fd8fbfc1SDmitry Monakhov 1433c469070aSDmitry Monakhov void inode_add_rsv_space(struct inode *inode, qsize_t number) 1434fd8fbfc1SDmitry Monakhov { 1435fd8fbfc1SDmitry Monakhov spin_lock(&inode->i_lock); 1436fd8fbfc1SDmitry Monakhov *inode_reserved_space(inode) += number; 1437fd8fbfc1SDmitry Monakhov spin_unlock(&inode->i_lock); 1438fd8fbfc1SDmitry Monakhov } 1439c469070aSDmitry Monakhov EXPORT_SYMBOL(inode_add_rsv_space); 1440fd8fbfc1SDmitry Monakhov 1441c469070aSDmitry Monakhov void inode_claim_rsv_space(struct inode *inode, qsize_t number) 1442fd8fbfc1SDmitry Monakhov { 1443fd8fbfc1SDmitry Monakhov spin_lock(&inode->i_lock); 1444fd8fbfc1SDmitry Monakhov *inode_reserved_space(inode) -= number; 1445fd8fbfc1SDmitry Monakhov __inode_add_bytes(inode, number); 1446fd8fbfc1SDmitry Monakhov spin_unlock(&inode->i_lock); 1447fd8fbfc1SDmitry Monakhov } 1448c469070aSDmitry Monakhov EXPORT_SYMBOL(inode_claim_rsv_space); 1449fd8fbfc1SDmitry Monakhov 1450c469070aSDmitry Monakhov void inode_sub_rsv_space(struct inode *inode, qsize_t number) 1451fd8fbfc1SDmitry Monakhov { 1452fd8fbfc1SDmitry Monakhov spin_lock(&inode->i_lock); 1453fd8fbfc1SDmitry Monakhov *inode_reserved_space(inode) -= number; 1454fd8fbfc1SDmitry Monakhov spin_unlock(&inode->i_lock); 1455fd8fbfc1SDmitry Monakhov } 1456c469070aSDmitry Monakhov EXPORT_SYMBOL(inode_sub_rsv_space); 1457fd8fbfc1SDmitry Monakhov 1458fd8fbfc1SDmitry Monakhov static qsize_t inode_get_rsv_space(struct inode *inode) 1459fd8fbfc1SDmitry Monakhov { 1460fd8fbfc1SDmitry Monakhov qsize_t ret; 146105b5d898SJan Kara 146205b5d898SJan Kara if (!inode->i_sb->dq_op->get_reserved_space) 146305b5d898SJan Kara return 0; 1464fd8fbfc1SDmitry Monakhov spin_lock(&inode->i_lock); 1465fd8fbfc1SDmitry Monakhov ret = *inode_reserved_space(inode); 1466fd8fbfc1SDmitry Monakhov spin_unlock(&inode->i_lock); 1467fd8fbfc1SDmitry Monakhov return ret; 1468fd8fbfc1SDmitry Monakhov } 1469fd8fbfc1SDmitry Monakhov 1470fd8fbfc1SDmitry Monakhov static void inode_incr_space(struct inode *inode, qsize_t number, 1471fd8fbfc1SDmitry Monakhov int reserve) 1472fd8fbfc1SDmitry Monakhov { 1473fd8fbfc1SDmitry Monakhov if (reserve) 1474fd8fbfc1SDmitry Monakhov inode_add_rsv_space(inode, number); 1475fd8fbfc1SDmitry Monakhov else 1476fd8fbfc1SDmitry Monakhov inode_add_bytes(inode, number); 1477fd8fbfc1SDmitry Monakhov } 1478fd8fbfc1SDmitry Monakhov 1479fd8fbfc1SDmitry Monakhov static void inode_decr_space(struct inode *inode, qsize_t number, int reserve) 1480fd8fbfc1SDmitry Monakhov { 1481fd8fbfc1SDmitry Monakhov if (reserve) 1482fd8fbfc1SDmitry Monakhov inode_sub_rsv_space(inode, number); 1483fd8fbfc1SDmitry Monakhov else 1484fd8fbfc1SDmitry Monakhov inode_sub_bytes(inode, number); 1485fd8fbfc1SDmitry Monakhov } 1486fd8fbfc1SDmitry Monakhov 1487fd8fbfc1SDmitry Monakhov /* 14885dd4056dSChristoph Hellwig * This functions updates i_blocks+i_bytes fields and quota information 14895dd4056dSChristoph Hellwig * (together with appropriate checks). 14905dd4056dSChristoph Hellwig * 14915dd4056dSChristoph Hellwig * NOTE: We absolutely rely on the fact that caller dirties the inode 14925dd4056dSChristoph Hellwig * (usually helpers in quotaops.h care about this) and holds a handle for 14935dd4056dSChristoph Hellwig * the current transaction so that dquot write and inode write go into the 14945dd4056dSChristoph Hellwig * same transaction. 1495884d179dSJan Kara */ 1496884d179dSJan Kara 1497884d179dSJan Kara /* 1498884d179dSJan Kara * This operation can block, but only after everything is updated 1499884d179dSJan Kara */ 1500884d179dSJan Kara int __dquot_alloc_space(struct inode *inode, qsize_t number, 1501884d179dSJan Kara int warn, int reserve) 1502884d179dSJan Kara { 15035dd4056dSChristoph Hellwig int cnt, ret = 0; 1504884d179dSJan Kara char warntype[MAXQUOTAS]; 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); 1525efd8f0e6SChristoph Hellwig if (ret) { 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 */ 16245dd4056dSChristoph Hellwig void __dquot_free_space(struct inode *inode, qsize_t number, int reserve) 1625884d179dSJan Kara { 1626884d179dSJan Kara unsigned int cnt; 1627884d179dSJan Kara char warntype[MAXQUOTAS]; 1628884d179dSJan Kara 1629884d179dSJan Kara /* First test before acquiring mutex - solves deadlocks when we 1630884d179dSJan Kara * re-enter the quota code and are already holding the mutex */ 16315dd4056dSChristoph Hellwig if (!sb_any_quota_active(inode->i_sb) || IS_NOQUOTA(inode)) { 1632fd8fbfc1SDmitry Monakhov inode_decr_space(inode, number, reserve); 16335dd4056dSChristoph Hellwig return; 1634884d179dSJan Kara } 1635884d179dSJan Kara 1636884d179dSJan Kara down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1637884d179dSJan Kara spin_lock(&dq_data_lock); 1638884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1639dd6f3c6dSJan Kara if (!inode->i_dquot[cnt]) 1640884d179dSJan Kara continue; 1641884d179dSJan Kara warntype[cnt] = info_bdq_free(inode->i_dquot[cnt], number); 1642fd8fbfc1SDmitry Monakhov if (reserve) 1643fd8fbfc1SDmitry Monakhov dquot_free_reserved_space(inode->i_dquot[cnt], number); 1644fd8fbfc1SDmitry Monakhov else 1645884d179dSJan Kara dquot_decr_space(inode->i_dquot[cnt], number); 1646884d179dSJan Kara } 1647fd8fbfc1SDmitry Monakhov inode_decr_space(inode, number, reserve); 1648884d179dSJan Kara spin_unlock(&dq_data_lock); 1649fd8fbfc1SDmitry Monakhov 1650fd8fbfc1SDmitry Monakhov if (reserve) 1651fd8fbfc1SDmitry Monakhov goto out_unlock; 1652dc52dd3aSDmitry Monakhov mark_all_dquot_dirty(inode->i_dquot); 1653fd8fbfc1SDmitry Monakhov out_unlock: 1654884d179dSJan Kara flush_warnings(inode->i_dquot, warntype); 1655884d179dSJan Kara up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1656884d179dSJan Kara } 16575dd4056dSChristoph Hellwig EXPORT_SYMBOL(__dquot_free_space); 1658fd8fbfc1SDmitry Monakhov 1659fd8fbfc1SDmitry Monakhov /* 1660884d179dSJan Kara * This operation can block, but only after everything is updated 1661884d179dSJan Kara */ 166263936ddaSChristoph Hellwig void dquot_free_inode(const struct inode *inode) 1663884d179dSJan Kara { 1664884d179dSJan Kara unsigned int cnt; 1665884d179dSJan Kara char warntype[MAXQUOTAS]; 1666884d179dSJan Kara 1667884d179dSJan Kara /* First test before acquiring mutex - solves deadlocks when we 1668884d179dSJan Kara * re-enter the quota code and are already holding the mutex */ 166963936ddaSChristoph Hellwig if (!sb_any_quota_active(inode->i_sb) || IS_NOQUOTA(inode)) 167063936ddaSChristoph Hellwig return; 1671884d179dSJan Kara 1672884d179dSJan Kara down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1673884d179dSJan Kara spin_lock(&dq_data_lock); 1674884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1675dd6f3c6dSJan Kara if (!inode->i_dquot[cnt]) 1676884d179dSJan Kara continue; 167763936ddaSChristoph Hellwig warntype[cnt] = info_idq_free(inode->i_dquot[cnt], 1); 167863936ddaSChristoph Hellwig dquot_decr_inodes(inode->i_dquot[cnt], 1); 1679884d179dSJan Kara } 1680884d179dSJan Kara spin_unlock(&dq_data_lock); 1681dc52dd3aSDmitry Monakhov mark_all_dquot_dirty(inode->i_dquot); 1682884d179dSJan Kara flush_warnings(inode->i_dquot, warntype); 1683884d179dSJan Kara up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1684884d179dSJan Kara } 1685884d179dSJan Kara EXPORT_SYMBOL(dquot_free_inode); 1686884d179dSJan Kara 1687884d179dSJan Kara /* 1688884d179dSJan Kara * Transfer the number of inode and blocks from one diskquota to an other. 1689884d179dSJan Kara * 1690884d179dSJan Kara * This operation can block, but only after everything is updated 1691884d179dSJan Kara * A transaction must be started when entering this function. 1692884d179dSJan Kara */ 1693b43fa828SChristoph Hellwig static int __dquot_transfer(struct inode *inode, qid_t *chid, unsigned long mask) 1694884d179dSJan Kara { 1695884d179dSJan Kara qsize_t space, cur_space; 1696884d179dSJan Kara qsize_t rsv_space = 0; 1697884d179dSJan Kara struct dquot *transfer_from[MAXQUOTAS]; 1698884d179dSJan Kara struct dquot *transfer_to[MAXQUOTAS]; 1699efd8f0e6SChristoph Hellwig int cnt, ret = 0; 1700884d179dSJan Kara char warntype_to[MAXQUOTAS]; 1701884d179dSJan Kara char warntype_from_inodes[MAXQUOTAS], warntype_from_space[MAXQUOTAS]; 1702884d179dSJan Kara 1703884d179dSJan Kara /* First test before acquiring mutex - solves deadlocks when we 1704884d179dSJan Kara * re-enter the quota code and are already holding the mutex */ 1705884d179dSJan Kara if (IS_NOQUOTA(inode)) 1706efd8f0e6SChristoph Hellwig return 0; 1707884d179dSJan Kara /* Initialize the arrays */ 1708884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1709dd6f3c6dSJan Kara transfer_from[cnt] = NULL; 1710dd6f3c6dSJan Kara transfer_to[cnt] = NULL; 1711884d179dSJan Kara warntype_to[cnt] = QUOTA_NL_NOWARN; 1712884d179dSJan Kara } 17138ddd69d6SDmitry Monakhov for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 17148ddd69d6SDmitry Monakhov if (mask & (1 << cnt)) 17158ddd69d6SDmitry Monakhov transfer_to[cnt] = dqget(inode->i_sb, chid[cnt], cnt); 17168ddd69d6SDmitry Monakhov } 1717884d179dSJan Kara down_write(&sb_dqopt(inode->i_sb)->dqptr_sem); 1718884d179dSJan Kara if (IS_NOQUOTA(inode)) { /* File without quota accounting? */ 1719884d179dSJan Kara up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); 1720884d179dSJan Kara goto put_all; 1721884d179dSJan Kara } 1722884d179dSJan Kara spin_lock(&dq_data_lock); 1723884d179dSJan Kara cur_space = inode_get_bytes(inode); 1724fd8fbfc1SDmitry Monakhov rsv_space = inode_get_rsv_space(inode); 1725884d179dSJan Kara space = cur_space + rsv_space; 1726884d179dSJan Kara /* Build the transfer_from list and check the limits */ 1727884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1728dd6f3c6dSJan Kara if (!transfer_to[cnt]) 1729884d179dSJan Kara continue; 1730884d179dSJan Kara transfer_from[cnt] = inode->i_dquot[cnt]; 1731efd8f0e6SChristoph Hellwig ret = check_idq(transfer_to[cnt], 1, warntype_to + cnt); 1732efd8f0e6SChristoph Hellwig if (ret) 1733efd8f0e6SChristoph Hellwig goto over_quota; 1734efd8f0e6SChristoph Hellwig ret = check_bdq(transfer_to[cnt], space, 0, warntype_to + cnt); 1735efd8f0e6SChristoph Hellwig if (ret) 1736884d179dSJan Kara goto over_quota; 1737884d179dSJan Kara } 1738884d179dSJan Kara 1739884d179dSJan Kara /* 1740884d179dSJan Kara * Finally perform the needed transfer from transfer_from to transfer_to 1741884d179dSJan Kara */ 1742884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1743884d179dSJan Kara /* 1744884d179dSJan Kara * Skip changes for same uid or gid or for turned off quota-type. 1745884d179dSJan Kara */ 1746dd6f3c6dSJan Kara if (!transfer_to[cnt]) 1747884d179dSJan Kara continue; 1748884d179dSJan Kara 1749884d179dSJan Kara /* Due to IO error we might not have transfer_from[] structure */ 1750884d179dSJan Kara if (transfer_from[cnt]) { 1751884d179dSJan Kara warntype_from_inodes[cnt] = 1752884d179dSJan Kara info_idq_free(transfer_from[cnt], 1); 1753884d179dSJan Kara warntype_from_space[cnt] = 1754884d179dSJan Kara info_bdq_free(transfer_from[cnt], space); 1755884d179dSJan Kara dquot_decr_inodes(transfer_from[cnt], 1); 1756884d179dSJan Kara dquot_decr_space(transfer_from[cnt], cur_space); 1757884d179dSJan Kara dquot_free_reserved_space(transfer_from[cnt], 1758884d179dSJan Kara rsv_space); 1759884d179dSJan Kara } 1760884d179dSJan Kara 1761884d179dSJan Kara dquot_incr_inodes(transfer_to[cnt], 1); 1762884d179dSJan Kara dquot_incr_space(transfer_to[cnt], cur_space); 1763884d179dSJan Kara dquot_resv_space(transfer_to[cnt], rsv_space); 1764884d179dSJan Kara 1765884d179dSJan Kara inode->i_dquot[cnt] = transfer_to[cnt]; 1766884d179dSJan Kara } 1767884d179dSJan Kara spin_unlock(&dq_data_lock); 1768884d179dSJan Kara up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); 1769884d179dSJan Kara 1770dc52dd3aSDmitry Monakhov mark_all_dquot_dirty(transfer_from); 1771dc52dd3aSDmitry Monakhov mark_all_dquot_dirty(transfer_to); 1772884d179dSJan Kara /* The reference we got is transferred to the inode */ 1773dc52dd3aSDmitry Monakhov for (cnt = 0; cnt < MAXQUOTAS; cnt++) 1774dd6f3c6dSJan Kara transfer_to[cnt] = NULL; 1775884d179dSJan Kara warn_put_all: 1776884d179dSJan Kara flush_warnings(transfer_to, warntype_to); 1777884d179dSJan Kara flush_warnings(transfer_from, warntype_from_inodes); 1778884d179dSJan Kara flush_warnings(transfer_from, warntype_from_space); 1779884d179dSJan Kara put_all: 1780dc52dd3aSDmitry Monakhov dqput_all(transfer_from); 1781dc52dd3aSDmitry Monakhov dqput_all(transfer_to); 1782884d179dSJan Kara return ret; 1783884d179dSJan Kara over_quota: 1784884d179dSJan Kara spin_unlock(&dq_data_lock); 1785884d179dSJan Kara up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); 1786884d179dSJan Kara /* Clear dquot pointers we don't want to dqput() */ 1787884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 1788dd6f3c6dSJan Kara transfer_from[cnt] = NULL; 1789884d179dSJan Kara goto warn_put_all; 1790884d179dSJan Kara } 1791884d179dSJan Kara 17928ddd69d6SDmitry Monakhov /* Wrapper for transferring ownership of an inode for uid/gid only 17938ddd69d6SDmitry Monakhov * Called from FSXXX_setattr() 17948ddd69d6SDmitry Monakhov */ 1795b43fa828SChristoph Hellwig int dquot_transfer(struct inode *inode, struct iattr *iattr) 1796884d179dSJan Kara { 17978ddd69d6SDmitry Monakhov qid_t chid[MAXQUOTAS]; 17988ddd69d6SDmitry Monakhov unsigned long mask = 0; 17998ddd69d6SDmitry Monakhov 18008ddd69d6SDmitry Monakhov if (iattr->ia_valid & ATTR_UID && iattr->ia_uid != inode->i_uid) { 18018ddd69d6SDmitry Monakhov mask |= 1 << USRQUOTA; 18028ddd69d6SDmitry Monakhov chid[USRQUOTA] = iattr->ia_uid; 18038ddd69d6SDmitry Monakhov } 18048ddd69d6SDmitry Monakhov if (iattr->ia_valid & ATTR_GID && iattr->ia_gid != inode->i_gid) { 18058ddd69d6SDmitry Monakhov mask |= 1 << GRPQUOTA; 18068ddd69d6SDmitry Monakhov chid[GRPQUOTA] = iattr->ia_gid; 18078ddd69d6SDmitry Monakhov } 1808884d179dSJan Kara if (sb_any_quota_active(inode->i_sb) && !IS_NOQUOTA(inode)) { 1809871a2931SChristoph Hellwig dquot_initialize(inode); 1810efd8f0e6SChristoph Hellwig return __dquot_transfer(inode, chid, mask); 1811884d179dSJan Kara } 1812884d179dSJan Kara return 0; 1813884d179dSJan Kara } 1814b43fa828SChristoph Hellwig EXPORT_SYMBOL(dquot_transfer); 1815884d179dSJan Kara 1816884d179dSJan Kara /* 1817884d179dSJan Kara * Write info of quota file to disk 1818884d179dSJan Kara */ 1819884d179dSJan Kara int dquot_commit_info(struct super_block *sb, int type) 1820884d179dSJan Kara { 1821884d179dSJan Kara int ret; 1822884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 1823884d179dSJan Kara 1824884d179dSJan Kara mutex_lock(&dqopt->dqio_mutex); 1825884d179dSJan Kara ret = dqopt->ops[type]->write_file_info(sb, type); 1826884d179dSJan Kara mutex_unlock(&dqopt->dqio_mutex); 1827884d179dSJan Kara return ret; 1828884d179dSJan Kara } 1829884d179dSJan Kara EXPORT_SYMBOL(dquot_commit_info); 1830884d179dSJan Kara 1831884d179dSJan Kara /* 1832884d179dSJan Kara * Definitions of diskquota operations. 1833884d179dSJan Kara */ 183461e225dcSAlexey Dobriyan const struct dquot_operations dquot_operations = { 1835884d179dSJan Kara .write_dquot = dquot_commit, 1836884d179dSJan Kara .acquire_dquot = dquot_acquire, 1837884d179dSJan Kara .release_dquot = dquot_release, 1838884d179dSJan Kara .mark_dirty = dquot_mark_dquot_dirty, 1839884d179dSJan Kara .write_info = dquot_commit_info, 1840884d179dSJan Kara .alloc_dquot = dquot_alloc, 1841884d179dSJan Kara .destroy_dquot = dquot_destroy, 1842884d179dSJan Kara }; 1843884d179dSJan Kara 1844884d179dSJan Kara /* 1845907f4554SChristoph Hellwig * Generic helper for ->open on filesystems supporting disk quotas. 1846907f4554SChristoph Hellwig */ 1847907f4554SChristoph Hellwig int dquot_file_open(struct inode *inode, struct file *file) 1848907f4554SChristoph Hellwig { 1849907f4554SChristoph Hellwig int error; 1850907f4554SChristoph Hellwig 1851907f4554SChristoph Hellwig error = generic_file_open(inode, file); 1852907f4554SChristoph Hellwig if (!error && (file->f_mode & FMODE_WRITE)) 1853871a2931SChristoph Hellwig dquot_initialize(inode); 1854907f4554SChristoph Hellwig return error; 1855907f4554SChristoph Hellwig } 1856907f4554SChristoph Hellwig EXPORT_SYMBOL(dquot_file_open); 1857907f4554SChristoph Hellwig 1858907f4554SChristoph Hellwig /* 1859884d179dSJan Kara * Turn quota off on a device. type == -1 ==> quotaoff for all types (umount) 1860884d179dSJan Kara */ 1861884d179dSJan Kara int vfs_quota_disable(struct super_block *sb, int type, unsigned int flags) 1862884d179dSJan Kara { 1863884d179dSJan Kara int cnt, ret = 0; 1864884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 1865884d179dSJan Kara struct inode *toputinode[MAXQUOTAS]; 1866884d179dSJan Kara 1867884d179dSJan Kara /* Cannot turn off usage accounting without turning off limits, or 1868884d179dSJan Kara * suspend quotas and simultaneously turn quotas off. */ 1869884d179dSJan Kara if ((flags & DQUOT_USAGE_ENABLED && !(flags & DQUOT_LIMITS_ENABLED)) 1870884d179dSJan Kara || (flags & DQUOT_SUSPENDED && flags & (DQUOT_LIMITS_ENABLED | 1871884d179dSJan Kara DQUOT_USAGE_ENABLED))) 1872884d179dSJan Kara return -EINVAL; 1873884d179dSJan Kara 1874884d179dSJan Kara /* We need to serialize quota_off() for device */ 1875884d179dSJan Kara mutex_lock(&dqopt->dqonoff_mutex); 1876884d179dSJan Kara 1877884d179dSJan Kara /* 1878884d179dSJan Kara * Skip everything if there's nothing to do. We have to do this because 1879884d179dSJan Kara * sometimes we are called when fill_super() failed and calling 1880884d179dSJan Kara * sync_fs() in such cases does no good. 1881884d179dSJan Kara */ 1882884d179dSJan Kara if (!sb_any_quota_loaded(sb)) { 1883884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 1884884d179dSJan Kara return 0; 1885884d179dSJan Kara } 1886884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1887884d179dSJan Kara toputinode[cnt] = NULL; 1888884d179dSJan Kara if (type != -1 && cnt != type) 1889884d179dSJan Kara continue; 1890884d179dSJan Kara if (!sb_has_quota_loaded(sb, cnt)) 1891884d179dSJan Kara continue; 1892884d179dSJan Kara 1893884d179dSJan Kara if (flags & DQUOT_SUSPENDED) { 1894884d179dSJan Kara spin_lock(&dq_state_lock); 1895884d179dSJan Kara dqopt->flags |= 1896884d179dSJan Kara dquot_state_flag(DQUOT_SUSPENDED, cnt); 1897884d179dSJan Kara spin_unlock(&dq_state_lock); 1898884d179dSJan Kara } else { 1899884d179dSJan Kara spin_lock(&dq_state_lock); 1900884d179dSJan Kara dqopt->flags &= ~dquot_state_flag(flags, cnt); 1901884d179dSJan Kara /* Turning off suspended quotas? */ 1902884d179dSJan Kara if (!sb_has_quota_loaded(sb, cnt) && 1903884d179dSJan Kara sb_has_quota_suspended(sb, cnt)) { 1904884d179dSJan Kara dqopt->flags &= ~dquot_state_flag( 1905884d179dSJan Kara DQUOT_SUSPENDED, cnt); 1906884d179dSJan Kara spin_unlock(&dq_state_lock); 1907884d179dSJan Kara iput(dqopt->files[cnt]); 1908884d179dSJan Kara dqopt->files[cnt] = NULL; 1909884d179dSJan Kara continue; 1910884d179dSJan Kara } 1911884d179dSJan Kara spin_unlock(&dq_state_lock); 1912884d179dSJan Kara } 1913884d179dSJan Kara 1914884d179dSJan Kara /* We still have to keep quota loaded? */ 1915884d179dSJan Kara if (sb_has_quota_loaded(sb, cnt) && !(flags & DQUOT_SUSPENDED)) 1916884d179dSJan Kara continue; 1917884d179dSJan Kara 1918884d179dSJan Kara /* Note: these are blocking operations */ 1919884d179dSJan Kara drop_dquot_ref(sb, cnt); 1920884d179dSJan Kara invalidate_dquots(sb, cnt); 1921884d179dSJan Kara /* 1922268157baSJan Kara * Now all dquots should be invalidated, all writes done so we 1923268157baSJan Kara * should be only users of the info. No locks needed. 1924884d179dSJan Kara */ 1925884d179dSJan Kara if (info_dirty(&dqopt->info[cnt])) 1926884d179dSJan Kara sb->dq_op->write_info(sb, cnt); 1927884d179dSJan Kara if (dqopt->ops[cnt]->free_file_info) 1928884d179dSJan Kara dqopt->ops[cnt]->free_file_info(sb, cnt); 1929884d179dSJan Kara put_quota_format(dqopt->info[cnt].dqi_format); 1930884d179dSJan Kara 1931884d179dSJan Kara toputinode[cnt] = dqopt->files[cnt]; 1932884d179dSJan Kara if (!sb_has_quota_loaded(sb, cnt)) 1933884d179dSJan Kara dqopt->files[cnt] = NULL; 1934884d179dSJan Kara dqopt->info[cnt].dqi_flags = 0; 1935884d179dSJan Kara dqopt->info[cnt].dqi_igrace = 0; 1936884d179dSJan Kara dqopt->info[cnt].dqi_bgrace = 0; 1937884d179dSJan Kara dqopt->ops[cnt] = NULL; 1938884d179dSJan Kara } 1939884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 1940884d179dSJan Kara 1941884d179dSJan Kara /* Skip syncing and setting flags if quota files are hidden */ 1942884d179dSJan Kara if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) 1943884d179dSJan Kara goto put_inodes; 1944884d179dSJan Kara 1945884d179dSJan Kara /* Sync the superblock so that buffers with quota data are written to 1946884d179dSJan Kara * disk (and so userspace sees correct data afterwards). */ 1947884d179dSJan Kara if (sb->s_op->sync_fs) 1948884d179dSJan Kara sb->s_op->sync_fs(sb, 1); 1949884d179dSJan Kara sync_blockdev(sb->s_bdev); 1950884d179dSJan Kara /* Now the quota files are just ordinary files and we can set the 1951884d179dSJan Kara * inode flags back. Moreover we discard the pagecache so that 1952884d179dSJan Kara * userspace sees the writes we did bypassing the pagecache. We 1953884d179dSJan Kara * must also discard the blockdev buffers so that we see the 1954884d179dSJan Kara * changes done by userspace on the next quotaon() */ 1955884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 1956884d179dSJan Kara if (toputinode[cnt]) { 1957884d179dSJan Kara mutex_lock(&dqopt->dqonoff_mutex); 1958884d179dSJan Kara /* If quota was reenabled in the meantime, we have 1959884d179dSJan Kara * nothing to do */ 1960884d179dSJan Kara if (!sb_has_quota_loaded(sb, cnt)) { 1961268157baSJan Kara mutex_lock_nested(&toputinode[cnt]->i_mutex, 1962268157baSJan Kara I_MUTEX_QUOTA); 1963884d179dSJan Kara toputinode[cnt]->i_flags &= ~(S_IMMUTABLE | 1964884d179dSJan Kara S_NOATIME | S_NOQUOTA); 1965268157baSJan Kara truncate_inode_pages(&toputinode[cnt]->i_data, 1966268157baSJan Kara 0); 1967884d179dSJan Kara mutex_unlock(&toputinode[cnt]->i_mutex); 1968884d179dSJan Kara mark_inode_dirty(toputinode[cnt]); 1969884d179dSJan Kara } 1970884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 1971884d179dSJan Kara } 1972884d179dSJan Kara if (sb->s_bdev) 1973884d179dSJan Kara invalidate_bdev(sb->s_bdev); 1974884d179dSJan Kara put_inodes: 1975884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 1976884d179dSJan Kara if (toputinode[cnt]) { 1977884d179dSJan Kara /* On remount RO, we keep the inode pointer so that we 1978884d179dSJan Kara * can reenable quota on the subsequent remount RW. We 1979884d179dSJan Kara * have to check 'flags' variable and not use sb_has_ 1980884d179dSJan Kara * function because another quotaon / quotaoff could 1981884d179dSJan Kara * change global state before we got here. We refuse 1982884d179dSJan Kara * to suspend quotas when there is pending delete on 1983884d179dSJan Kara * the quota file... */ 1984884d179dSJan Kara if (!(flags & DQUOT_SUSPENDED)) 1985884d179dSJan Kara iput(toputinode[cnt]); 1986884d179dSJan Kara else if (!toputinode[cnt]->i_nlink) 1987884d179dSJan Kara ret = -EBUSY; 1988884d179dSJan Kara } 1989884d179dSJan Kara return ret; 1990884d179dSJan Kara } 1991884d179dSJan Kara EXPORT_SYMBOL(vfs_quota_disable); 1992884d179dSJan Kara 1993884d179dSJan Kara int vfs_quota_off(struct super_block *sb, int type, int remount) 1994884d179dSJan Kara { 1995884d179dSJan Kara return vfs_quota_disable(sb, type, remount ? DQUOT_SUSPENDED : 1996884d179dSJan Kara (DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED)); 1997884d179dSJan Kara } 1998884d179dSJan Kara EXPORT_SYMBOL(vfs_quota_off); 1999884d179dSJan Kara /* 2000884d179dSJan Kara * Turn quotas on on a device 2001884d179dSJan Kara */ 2002884d179dSJan Kara 2003884d179dSJan Kara /* 2004884d179dSJan Kara * Helper function to turn quotas on when we already have the inode of 2005884d179dSJan Kara * quota file and no quota information is loaded. 2006884d179dSJan Kara */ 2007884d179dSJan Kara static int vfs_load_quota_inode(struct inode *inode, int type, int format_id, 2008884d179dSJan Kara unsigned int flags) 2009884d179dSJan Kara { 2010884d179dSJan Kara struct quota_format_type *fmt = find_quota_format(format_id); 2011884d179dSJan Kara struct super_block *sb = inode->i_sb; 2012884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 2013884d179dSJan Kara int error; 2014884d179dSJan Kara int oldflags = -1; 2015884d179dSJan Kara 2016884d179dSJan Kara if (!fmt) 2017884d179dSJan Kara return -ESRCH; 2018884d179dSJan Kara if (!S_ISREG(inode->i_mode)) { 2019884d179dSJan Kara error = -EACCES; 2020884d179dSJan Kara goto out_fmt; 2021884d179dSJan Kara } 2022884d179dSJan Kara if (IS_RDONLY(inode)) { 2023884d179dSJan Kara error = -EROFS; 2024884d179dSJan Kara goto out_fmt; 2025884d179dSJan Kara } 2026884d179dSJan Kara if (!sb->s_op->quota_write || !sb->s_op->quota_read) { 2027884d179dSJan Kara error = -EINVAL; 2028884d179dSJan Kara goto out_fmt; 2029884d179dSJan Kara } 2030884d179dSJan Kara /* Usage always has to be set... */ 2031884d179dSJan Kara if (!(flags & DQUOT_USAGE_ENABLED)) { 2032884d179dSJan Kara error = -EINVAL; 2033884d179dSJan Kara goto out_fmt; 2034884d179dSJan Kara } 2035884d179dSJan Kara 2036884d179dSJan Kara if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) { 2037ab94c39bSJan Kara /* As we bypass the pagecache we must now flush all the 2038ab94c39bSJan Kara * dirty data and invalidate caches so that kernel sees 2039ab94c39bSJan Kara * changes from userspace. It is not enough to just flush 2040ab94c39bSJan Kara * the quota file since if blocksize < pagesize, invalidation 2041ab94c39bSJan Kara * of the cache could fail because of other unrelated dirty 2042ab94c39bSJan Kara * data */ 2043ab94c39bSJan Kara sync_filesystem(sb); 2044884d179dSJan Kara invalidate_bdev(sb->s_bdev); 2045884d179dSJan Kara } 2046884d179dSJan Kara mutex_lock(&dqopt->dqonoff_mutex); 2047884d179dSJan Kara if (sb_has_quota_loaded(sb, type)) { 2048884d179dSJan Kara error = -EBUSY; 2049884d179dSJan Kara goto out_lock; 2050884d179dSJan Kara } 2051884d179dSJan Kara 2052884d179dSJan Kara if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) { 2053884d179dSJan Kara /* We don't want quota and atime on quota files (deadlocks 2054884d179dSJan Kara * possible) Also nobody should write to the file - we use 2055884d179dSJan Kara * special IO operations which ignore the immutable bit. */ 2056dee86565SJan Kara mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA); 2057268157baSJan Kara oldflags = inode->i_flags & (S_NOATIME | S_IMMUTABLE | 2058268157baSJan Kara S_NOQUOTA); 2059884d179dSJan Kara inode->i_flags |= S_NOQUOTA | S_NOATIME | S_IMMUTABLE; 2060dee86565SJan Kara mutex_unlock(&inode->i_mutex); 206126245c94SJan Kara /* 206226245c94SJan Kara * When S_NOQUOTA is set, remove dquot references as no more 206326245c94SJan Kara * references can be added 206426245c94SJan Kara */ 20659f754758SChristoph Hellwig __dquot_drop(inode); 2066884d179dSJan Kara } 2067884d179dSJan Kara 2068884d179dSJan Kara error = -EIO; 2069884d179dSJan Kara dqopt->files[type] = igrab(inode); 2070884d179dSJan Kara if (!dqopt->files[type]) 2071884d179dSJan Kara goto out_lock; 2072884d179dSJan Kara error = -EINVAL; 2073884d179dSJan Kara if (!fmt->qf_ops->check_quota_file(sb, type)) 2074884d179dSJan Kara goto out_file_init; 2075884d179dSJan Kara 2076884d179dSJan Kara dqopt->ops[type] = fmt->qf_ops; 2077884d179dSJan Kara dqopt->info[type].dqi_format = fmt; 2078884d179dSJan Kara dqopt->info[type].dqi_fmt_id = format_id; 2079884d179dSJan Kara INIT_LIST_HEAD(&dqopt->info[type].dqi_dirty_list); 2080884d179dSJan Kara mutex_lock(&dqopt->dqio_mutex); 2081268157baSJan Kara error = dqopt->ops[type]->read_file_info(sb, type); 2082268157baSJan Kara if (error < 0) { 2083884d179dSJan Kara mutex_unlock(&dqopt->dqio_mutex); 2084884d179dSJan Kara goto out_file_init; 2085884d179dSJan Kara } 2086884d179dSJan Kara mutex_unlock(&dqopt->dqio_mutex); 2087884d179dSJan Kara spin_lock(&dq_state_lock); 2088884d179dSJan Kara dqopt->flags |= dquot_state_flag(flags, type); 2089884d179dSJan Kara spin_unlock(&dq_state_lock); 2090884d179dSJan Kara 2091884d179dSJan Kara add_dquot_ref(sb, type); 2092884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 2093884d179dSJan Kara 2094884d179dSJan Kara return 0; 2095884d179dSJan Kara 2096884d179dSJan Kara out_file_init: 2097884d179dSJan Kara dqopt->files[type] = NULL; 2098884d179dSJan Kara iput(inode); 2099884d179dSJan Kara out_lock: 2100884d179dSJan Kara if (oldflags != -1) { 2101dee86565SJan Kara mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA); 2102884d179dSJan Kara /* Set the flags back (in the case of accidental quotaon() 2103884d179dSJan Kara * on a wrong file we don't want to mess up the flags) */ 2104884d179dSJan Kara inode->i_flags &= ~(S_NOATIME | S_NOQUOTA | S_IMMUTABLE); 2105884d179dSJan Kara inode->i_flags |= oldflags; 2106dee86565SJan Kara mutex_unlock(&inode->i_mutex); 2107884d179dSJan Kara } 2108d01730d7SJiaying Zhang mutex_unlock(&dqopt->dqonoff_mutex); 2109884d179dSJan Kara out_fmt: 2110884d179dSJan Kara put_quota_format(fmt); 2111884d179dSJan Kara 2112884d179dSJan Kara return error; 2113884d179dSJan Kara } 2114884d179dSJan Kara 2115884d179dSJan Kara /* Reenable quotas on remount RW */ 2116884d179dSJan Kara static int vfs_quota_on_remount(struct super_block *sb, int type) 2117884d179dSJan Kara { 2118884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 2119884d179dSJan Kara struct inode *inode; 2120884d179dSJan Kara int ret; 2121884d179dSJan Kara unsigned int flags; 2122884d179dSJan Kara 2123884d179dSJan Kara mutex_lock(&dqopt->dqonoff_mutex); 2124884d179dSJan Kara if (!sb_has_quota_suspended(sb, type)) { 2125884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 2126884d179dSJan Kara return 0; 2127884d179dSJan Kara } 2128884d179dSJan Kara inode = dqopt->files[type]; 2129884d179dSJan Kara dqopt->files[type] = NULL; 2130884d179dSJan Kara spin_lock(&dq_state_lock); 2131884d179dSJan Kara flags = dqopt->flags & dquot_state_flag(DQUOT_USAGE_ENABLED | 2132884d179dSJan Kara DQUOT_LIMITS_ENABLED, type); 2133884d179dSJan Kara dqopt->flags &= ~dquot_state_flag(DQUOT_STATE_FLAGS, type); 2134884d179dSJan Kara spin_unlock(&dq_state_lock); 2135884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 2136884d179dSJan Kara 2137884d179dSJan Kara flags = dquot_generic_flag(flags, type); 2138884d179dSJan Kara ret = vfs_load_quota_inode(inode, type, dqopt->info[type].dqi_fmt_id, 2139884d179dSJan Kara flags); 2140884d179dSJan Kara iput(inode); 2141884d179dSJan Kara 2142884d179dSJan Kara return ret; 2143884d179dSJan Kara } 2144884d179dSJan Kara 2145884d179dSJan Kara int vfs_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 } 2160884d179dSJan Kara EXPORT_SYMBOL(vfs_quota_on_path); 2161884d179dSJan Kara 2162884d179dSJan Kara int vfs_quota_on(struct super_block *sb, int type, int format_id, char *name, 2163884d179dSJan Kara int remount) 2164884d179dSJan Kara { 2165884d179dSJan Kara struct path path; 2166884d179dSJan Kara int error; 2167884d179dSJan Kara 2168884d179dSJan Kara if (remount) 2169884d179dSJan Kara return vfs_quota_on_remount(sb, type); 2170884d179dSJan Kara 2171884d179dSJan Kara error = kern_path(name, LOOKUP_FOLLOW, &path); 2172884d179dSJan Kara if (!error) { 2173884d179dSJan Kara error = vfs_quota_on_path(sb, type, format_id, &path); 2174884d179dSJan Kara path_put(&path); 2175884d179dSJan Kara } 2176884d179dSJan Kara return error; 2177884d179dSJan Kara } 2178884d179dSJan Kara EXPORT_SYMBOL(vfs_quota_on); 2179884d179dSJan Kara 2180884d179dSJan Kara /* 2181884d179dSJan Kara * More powerful function for turning on quotas allowing setting 2182884d179dSJan Kara * of individual quota flags 2183884d179dSJan Kara */ 2184884d179dSJan Kara int vfs_quota_enable(struct inode *inode, int type, int format_id, 2185884d179dSJan Kara unsigned int flags) 2186884d179dSJan Kara { 2187884d179dSJan Kara int ret = 0; 2188884d179dSJan Kara struct super_block *sb = inode->i_sb; 2189884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 2190884d179dSJan Kara 2191884d179dSJan Kara /* Just unsuspend quotas? */ 2192884d179dSJan Kara if (flags & DQUOT_SUSPENDED) 2193884d179dSJan Kara return vfs_quota_on_remount(sb, type); 2194884d179dSJan Kara if (!flags) 2195884d179dSJan Kara return 0; 2196884d179dSJan Kara /* Just updating flags needed? */ 2197884d179dSJan Kara if (sb_has_quota_loaded(sb, type)) { 2198884d179dSJan Kara mutex_lock(&dqopt->dqonoff_mutex); 2199884d179dSJan Kara /* Now do a reliable test... */ 2200884d179dSJan Kara if (!sb_has_quota_loaded(sb, type)) { 2201884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 2202884d179dSJan Kara goto load_quota; 2203884d179dSJan Kara } 2204884d179dSJan Kara if (flags & DQUOT_USAGE_ENABLED && 2205884d179dSJan Kara sb_has_quota_usage_enabled(sb, type)) { 2206884d179dSJan Kara ret = -EBUSY; 2207884d179dSJan Kara goto out_lock; 2208884d179dSJan Kara } 2209884d179dSJan Kara if (flags & DQUOT_LIMITS_ENABLED && 2210884d179dSJan Kara sb_has_quota_limits_enabled(sb, type)) { 2211884d179dSJan Kara ret = -EBUSY; 2212884d179dSJan Kara goto out_lock; 2213884d179dSJan Kara } 2214884d179dSJan Kara spin_lock(&dq_state_lock); 2215884d179dSJan Kara sb_dqopt(sb)->flags |= dquot_state_flag(flags, type); 2216884d179dSJan Kara spin_unlock(&dq_state_lock); 2217884d179dSJan Kara out_lock: 2218884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 2219884d179dSJan Kara return ret; 2220884d179dSJan Kara } 2221884d179dSJan Kara 2222884d179dSJan Kara load_quota: 2223884d179dSJan Kara return vfs_load_quota_inode(inode, type, format_id, flags); 2224884d179dSJan Kara } 2225884d179dSJan Kara EXPORT_SYMBOL(vfs_quota_enable); 2226884d179dSJan Kara 2227884d179dSJan Kara /* 2228884d179dSJan Kara * This function is used when filesystem needs to initialize quotas 2229884d179dSJan Kara * during mount time. 2230884d179dSJan Kara */ 2231884d179dSJan Kara int vfs_quota_on_mount(struct super_block *sb, char *qf_name, 2232884d179dSJan Kara int format_id, int type) 2233884d179dSJan Kara { 2234884d179dSJan Kara struct dentry *dentry; 2235884d179dSJan Kara int error; 2236884d179dSJan Kara 2237c56818d7SJan Kara mutex_lock(&sb->s_root->d_inode->i_mutex); 2238884d179dSJan Kara dentry = lookup_one_len(qf_name, sb->s_root, strlen(qf_name)); 2239c56818d7SJan Kara mutex_unlock(&sb->s_root->d_inode->i_mutex); 2240884d179dSJan Kara if (IS_ERR(dentry)) 2241884d179dSJan Kara return PTR_ERR(dentry); 2242884d179dSJan Kara 2243884d179dSJan Kara if (!dentry->d_inode) { 2244884d179dSJan Kara error = -ENOENT; 2245884d179dSJan Kara goto out; 2246884d179dSJan Kara } 2247884d179dSJan Kara 2248884d179dSJan Kara error = security_quota_on(dentry); 2249884d179dSJan Kara if (!error) 2250884d179dSJan Kara error = vfs_load_quota_inode(dentry->d_inode, type, format_id, 2251884d179dSJan Kara DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); 2252884d179dSJan Kara 2253884d179dSJan Kara out: 2254884d179dSJan Kara dput(dentry); 2255884d179dSJan Kara return error; 2256884d179dSJan Kara } 2257884d179dSJan Kara EXPORT_SYMBOL(vfs_quota_on_mount); 2258884d179dSJan Kara 2259884d179dSJan Kara /* Wrapper to turn on quotas when remounting rw */ 2260884d179dSJan Kara int vfs_dq_quota_on_remount(struct super_block *sb) 2261884d179dSJan Kara { 2262884d179dSJan Kara int cnt; 2263884d179dSJan Kara int ret = 0, err; 2264884d179dSJan Kara 2265884d179dSJan Kara if (!sb->s_qcop || !sb->s_qcop->quota_on) 2266884d179dSJan Kara return -ENOSYS; 2267884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 2268884d179dSJan Kara err = sb->s_qcop->quota_on(sb, cnt, 0, NULL, 1); 2269884d179dSJan Kara if (err < 0 && !ret) 2270884d179dSJan Kara ret = err; 2271884d179dSJan Kara } 2272884d179dSJan Kara return ret; 2273884d179dSJan Kara } 2274884d179dSJan Kara EXPORT_SYMBOL(vfs_dq_quota_on_remount); 2275884d179dSJan Kara 2276884d179dSJan Kara static inline qsize_t qbtos(qsize_t blocks) 2277884d179dSJan Kara { 2278884d179dSJan Kara return blocks << QIF_DQBLKSIZE_BITS; 2279884d179dSJan Kara } 2280884d179dSJan Kara 2281884d179dSJan Kara static inline qsize_t stoqb(qsize_t space) 2282884d179dSJan Kara { 2283884d179dSJan Kara return (space + QIF_DQBLKSIZE - 1) >> QIF_DQBLKSIZE_BITS; 2284884d179dSJan Kara } 2285884d179dSJan Kara 2286884d179dSJan Kara /* Generic routine for getting common part of quota structure */ 2287884d179dSJan Kara static void do_get_dqblk(struct dquot *dquot, struct if_dqblk *di) 2288884d179dSJan Kara { 2289884d179dSJan Kara struct mem_dqblk *dm = &dquot->dq_dqb; 2290884d179dSJan Kara 2291884d179dSJan Kara spin_lock(&dq_data_lock); 2292884d179dSJan Kara di->dqb_bhardlimit = stoqb(dm->dqb_bhardlimit); 2293884d179dSJan Kara di->dqb_bsoftlimit = stoqb(dm->dqb_bsoftlimit); 2294884d179dSJan Kara di->dqb_curspace = dm->dqb_curspace + dm->dqb_rsvspace; 2295884d179dSJan Kara di->dqb_ihardlimit = dm->dqb_ihardlimit; 2296884d179dSJan Kara di->dqb_isoftlimit = dm->dqb_isoftlimit; 2297884d179dSJan Kara di->dqb_curinodes = dm->dqb_curinodes; 2298884d179dSJan Kara di->dqb_btime = dm->dqb_btime; 2299884d179dSJan Kara di->dqb_itime = dm->dqb_itime; 2300884d179dSJan Kara di->dqb_valid = QIF_ALL; 2301884d179dSJan Kara spin_unlock(&dq_data_lock); 2302884d179dSJan Kara } 2303884d179dSJan Kara 2304268157baSJan Kara int vfs_get_dqblk(struct super_block *sb, int type, qid_t id, 2305268157baSJan Kara struct if_dqblk *di) 2306884d179dSJan Kara { 2307884d179dSJan Kara struct dquot *dquot; 2308884d179dSJan Kara 2309884d179dSJan Kara dquot = dqget(sb, id, type); 2310dd6f3c6dSJan Kara if (!dquot) 2311884d179dSJan Kara return -ESRCH; 2312884d179dSJan Kara do_get_dqblk(dquot, di); 2313884d179dSJan Kara dqput(dquot); 2314884d179dSJan Kara 2315884d179dSJan Kara return 0; 2316884d179dSJan Kara } 2317884d179dSJan Kara EXPORT_SYMBOL(vfs_get_dqblk); 2318884d179dSJan Kara 2319884d179dSJan Kara /* Generic routine for setting common part of quota structure */ 2320884d179dSJan Kara static int do_set_dqblk(struct dquot *dquot, struct if_dqblk *di) 2321884d179dSJan Kara { 2322884d179dSJan Kara struct mem_dqblk *dm = &dquot->dq_dqb; 2323884d179dSJan Kara int check_blim = 0, check_ilim = 0; 2324884d179dSJan Kara struct mem_dqinfo *dqi = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_type]; 2325884d179dSJan Kara 2326884d179dSJan Kara if ((di->dqb_valid & QIF_BLIMITS && 2327884d179dSJan Kara (di->dqb_bhardlimit > dqi->dqi_maxblimit || 2328884d179dSJan Kara di->dqb_bsoftlimit > dqi->dqi_maxblimit)) || 2329884d179dSJan Kara (di->dqb_valid & QIF_ILIMITS && 2330884d179dSJan Kara (di->dqb_ihardlimit > dqi->dqi_maxilimit || 2331884d179dSJan Kara di->dqb_isoftlimit > dqi->dqi_maxilimit))) 2332884d179dSJan Kara return -ERANGE; 2333884d179dSJan Kara 2334884d179dSJan Kara spin_lock(&dq_data_lock); 2335884d179dSJan Kara if (di->dqb_valid & QIF_SPACE) { 2336884d179dSJan Kara dm->dqb_curspace = di->dqb_curspace - dm->dqb_rsvspace; 2337884d179dSJan Kara check_blim = 1; 233808261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags); 2339884d179dSJan Kara } 2340884d179dSJan Kara if (di->dqb_valid & QIF_BLIMITS) { 2341884d179dSJan Kara dm->dqb_bsoftlimit = qbtos(di->dqb_bsoftlimit); 2342884d179dSJan Kara dm->dqb_bhardlimit = qbtos(di->dqb_bhardlimit); 2343884d179dSJan Kara check_blim = 1; 234408261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags); 2345884d179dSJan Kara } 2346884d179dSJan Kara if (di->dqb_valid & QIF_INODES) { 2347884d179dSJan Kara dm->dqb_curinodes = di->dqb_curinodes; 2348884d179dSJan Kara check_ilim = 1; 234908261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags); 2350884d179dSJan Kara } 2351884d179dSJan Kara if (di->dqb_valid & QIF_ILIMITS) { 2352884d179dSJan Kara dm->dqb_isoftlimit = di->dqb_isoftlimit; 2353884d179dSJan Kara dm->dqb_ihardlimit = di->dqb_ihardlimit; 2354884d179dSJan Kara check_ilim = 1; 235508261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags); 2356884d179dSJan Kara } 2357884d179dSJan Kara if (di->dqb_valid & QIF_BTIME) { 2358884d179dSJan Kara dm->dqb_btime = di->dqb_btime; 2359884d179dSJan Kara check_blim = 1; 236008261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags); 2361884d179dSJan Kara } 2362884d179dSJan Kara if (di->dqb_valid & QIF_ITIME) { 2363884d179dSJan Kara dm->dqb_itime = di->dqb_itime; 2364884d179dSJan Kara check_ilim = 1; 236508261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags); 2366884d179dSJan Kara } 2367884d179dSJan Kara 2368884d179dSJan Kara if (check_blim) { 2369268157baSJan Kara if (!dm->dqb_bsoftlimit || 2370268157baSJan Kara dm->dqb_curspace < dm->dqb_bsoftlimit) { 2371884d179dSJan Kara dm->dqb_btime = 0; 2372884d179dSJan Kara clear_bit(DQ_BLKS_B, &dquot->dq_flags); 2373268157baSJan Kara } else if (!(di->dqb_valid & QIF_BTIME)) 2374268157baSJan Kara /* Set grace only if user hasn't provided his own... */ 2375884d179dSJan Kara dm->dqb_btime = get_seconds() + dqi->dqi_bgrace; 2376884d179dSJan Kara } 2377884d179dSJan Kara if (check_ilim) { 2378268157baSJan Kara if (!dm->dqb_isoftlimit || 2379268157baSJan Kara dm->dqb_curinodes < dm->dqb_isoftlimit) { 2380884d179dSJan Kara dm->dqb_itime = 0; 2381884d179dSJan Kara clear_bit(DQ_INODES_B, &dquot->dq_flags); 2382268157baSJan Kara } else if (!(di->dqb_valid & QIF_ITIME)) 2383268157baSJan Kara /* Set grace only if user hasn't provided his own... */ 2384884d179dSJan Kara dm->dqb_itime = get_seconds() + dqi->dqi_igrace; 2385884d179dSJan Kara } 2386268157baSJan Kara if (dm->dqb_bhardlimit || dm->dqb_bsoftlimit || dm->dqb_ihardlimit || 2387268157baSJan Kara dm->dqb_isoftlimit) 2388884d179dSJan Kara clear_bit(DQ_FAKE_B, &dquot->dq_flags); 2389884d179dSJan Kara else 2390884d179dSJan Kara set_bit(DQ_FAKE_B, &dquot->dq_flags); 2391884d179dSJan Kara spin_unlock(&dq_data_lock); 2392884d179dSJan Kara mark_dquot_dirty(dquot); 2393884d179dSJan Kara 2394884d179dSJan Kara return 0; 2395884d179dSJan Kara } 2396884d179dSJan Kara 2397268157baSJan Kara int vfs_set_dqblk(struct super_block *sb, int type, qid_t id, 2398268157baSJan Kara struct if_dqblk *di) 2399884d179dSJan Kara { 2400884d179dSJan Kara struct dquot *dquot; 2401884d179dSJan Kara int rc; 2402884d179dSJan Kara 2403884d179dSJan Kara dquot = dqget(sb, id, type); 2404884d179dSJan Kara if (!dquot) { 2405884d179dSJan Kara rc = -ESRCH; 2406884d179dSJan Kara goto out; 2407884d179dSJan Kara } 2408884d179dSJan Kara rc = do_set_dqblk(dquot, di); 2409884d179dSJan Kara dqput(dquot); 2410884d179dSJan Kara out: 2411884d179dSJan Kara return rc; 2412884d179dSJan Kara } 2413884d179dSJan Kara EXPORT_SYMBOL(vfs_set_dqblk); 2414884d179dSJan Kara 2415884d179dSJan Kara /* Generic routine for getting common part of quota file information */ 2416884d179dSJan Kara int vfs_get_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii) 2417884d179dSJan Kara { 2418884d179dSJan Kara struct mem_dqinfo *mi; 2419884d179dSJan Kara 2420884d179dSJan Kara mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); 2421884d179dSJan Kara if (!sb_has_quota_active(sb, type)) { 2422884d179dSJan Kara mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); 2423884d179dSJan Kara return -ESRCH; 2424884d179dSJan Kara } 2425884d179dSJan Kara mi = sb_dqopt(sb)->info + type; 2426884d179dSJan Kara spin_lock(&dq_data_lock); 2427884d179dSJan Kara ii->dqi_bgrace = mi->dqi_bgrace; 2428884d179dSJan Kara ii->dqi_igrace = mi->dqi_igrace; 2429884d179dSJan Kara ii->dqi_flags = mi->dqi_flags & DQF_MASK; 2430884d179dSJan Kara ii->dqi_valid = IIF_ALL; 2431884d179dSJan Kara spin_unlock(&dq_data_lock); 2432884d179dSJan Kara mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); 2433884d179dSJan Kara return 0; 2434884d179dSJan Kara } 2435884d179dSJan Kara EXPORT_SYMBOL(vfs_get_dqinfo); 2436884d179dSJan Kara 2437884d179dSJan Kara /* Generic routine for setting common part of quota file information */ 2438884d179dSJan Kara int vfs_set_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii) 2439884d179dSJan Kara { 2440884d179dSJan Kara struct mem_dqinfo *mi; 2441884d179dSJan Kara int err = 0; 2442884d179dSJan Kara 2443884d179dSJan Kara mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); 2444884d179dSJan Kara if (!sb_has_quota_active(sb, type)) { 2445884d179dSJan Kara err = -ESRCH; 2446884d179dSJan Kara goto out; 2447884d179dSJan Kara } 2448884d179dSJan Kara mi = sb_dqopt(sb)->info + type; 2449884d179dSJan Kara spin_lock(&dq_data_lock); 2450884d179dSJan Kara if (ii->dqi_valid & IIF_BGRACE) 2451884d179dSJan Kara mi->dqi_bgrace = ii->dqi_bgrace; 2452884d179dSJan Kara if (ii->dqi_valid & IIF_IGRACE) 2453884d179dSJan Kara mi->dqi_igrace = ii->dqi_igrace; 2454884d179dSJan Kara if (ii->dqi_valid & IIF_FLAGS) 2455268157baSJan Kara mi->dqi_flags = (mi->dqi_flags & ~DQF_MASK) | 2456268157baSJan Kara (ii->dqi_flags & DQF_MASK); 2457884d179dSJan Kara spin_unlock(&dq_data_lock); 2458884d179dSJan Kara mark_info_dirty(sb, type); 2459884d179dSJan Kara /* Force write to disk */ 2460884d179dSJan Kara sb->dq_op->write_info(sb, type); 2461884d179dSJan Kara out: 2462884d179dSJan Kara mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); 2463884d179dSJan Kara return err; 2464884d179dSJan Kara } 2465884d179dSJan Kara EXPORT_SYMBOL(vfs_set_dqinfo); 2466884d179dSJan Kara 24670d54b217SAlexey Dobriyan const struct quotactl_ops vfs_quotactl_ops = { 2468884d179dSJan Kara .quota_on = vfs_quota_on, 2469884d179dSJan Kara .quota_off = vfs_quota_off, 2470884d179dSJan Kara .quota_sync = vfs_quota_sync, 2471884d179dSJan Kara .get_info = vfs_get_dqinfo, 2472884d179dSJan Kara .set_info = vfs_set_dqinfo, 2473884d179dSJan Kara .get_dqblk = vfs_get_dqblk, 2474884d179dSJan Kara .set_dqblk = vfs_set_dqblk 2475884d179dSJan Kara }; 2476884d179dSJan Kara 2477884d179dSJan Kara static ctl_table fs_dqstats_table[] = { 2478884d179dSJan Kara { 2479884d179dSJan Kara .procname = "lookups", 2480884d179dSJan Kara .data = &dqstats.lookups, 2481884d179dSJan Kara .maxlen = sizeof(int), 2482884d179dSJan Kara .mode = 0444, 24836d456111SEric W. Biederman .proc_handler = proc_dointvec, 2484884d179dSJan Kara }, 2485884d179dSJan Kara { 2486884d179dSJan Kara .procname = "drops", 2487884d179dSJan Kara .data = &dqstats.drops, 2488884d179dSJan Kara .maxlen = sizeof(int), 2489884d179dSJan Kara .mode = 0444, 24906d456111SEric W. Biederman .proc_handler = proc_dointvec, 2491884d179dSJan Kara }, 2492884d179dSJan Kara { 2493884d179dSJan Kara .procname = "reads", 2494884d179dSJan Kara .data = &dqstats.reads, 2495884d179dSJan Kara .maxlen = sizeof(int), 2496884d179dSJan Kara .mode = 0444, 24976d456111SEric W. Biederman .proc_handler = proc_dointvec, 2498884d179dSJan Kara }, 2499884d179dSJan Kara { 2500884d179dSJan Kara .procname = "writes", 2501884d179dSJan Kara .data = &dqstats.writes, 2502884d179dSJan Kara .maxlen = sizeof(int), 2503884d179dSJan Kara .mode = 0444, 25046d456111SEric W. Biederman .proc_handler = proc_dointvec, 2505884d179dSJan Kara }, 2506884d179dSJan Kara { 2507884d179dSJan Kara .procname = "cache_hits", 2508884d179dSJan Kara .data = &dqstats.cache_hits, 2509884d179dSJan Kara .maxlen = sizeof(int), 2510884d179dSJan Kara .mode = 0444, 25116d456111SEric W. Biederman .proc_handler = proc_dointvec, 2512884d179dSJan Kara }, 2513884d179dSJan Kara { 2514884d179dSJan Kara .procname = "allocated_dquots", 2515884d179dSJan Kara .data = &dqstats.allocated_dquots, 2516884d179dSJan Kara .maxlen = sizeof(int), 2517884d179dSJan Kara .mode = 0444, 25186d456111SEric W. Biederman .proc_handler = proc_dointvec, 2519884d179dSJan Kara }, 2520884d179dSJan Kara { 2521884d179dSJan Kara .procname = "free_dquots", 2522884d179dSJan Kara .data = &dqstats.free_dquots, 2523884d179dSJan Kara .maxlen = sizeof(int), 2524884d179dSJan Kara .mode = 0444, 25256d456111SEric W. Biederman .proc_handler = proc_dointvec, 2526884d179dSJan Kara }, 2527884d179dSJan Kara { 2528884d179dSJan Kara .procname = "syncs", 2529884d179dSJan Kara .data = &dqstats.syncs, 2530884d179dSJan Kara .maxlen = sizeof(int), 2531884d179dSJan Kara .mode = 0444, 25326d456111SEric W. Biederman .proc_handler = proc_dointvec, 2533884d179dSJan Kara }, 2534884d179dSJan Kara #ifdef CONFIG_PRINT_QUOTA_WARNING 2535884d179dSJan Kara { 2536884d179dSJan Kara .procname = "warnings", 2537884d179dSJan Kara .data = &flag_print_warnings, 2538884d179dSJan Kara .maxlen = sizeof(int), 2539884d179dSJan Kara .mode = 0644, 25406d456111SEric W. Biederman .proc_handler = proc_dointvec, 2541884d179dSJan Kara }, 2542884d179dSJan Kara #endif 2543ab09203eSEric W. Biederman { }, 2544884d179dSJan Kara }; 2545884d179dSJan Kara 2546884d179dSJan Kara static ctl_table fs_table[] = { 2547884d179dSJan Kara { 2548884d179dSJan Kara .procname = "quota", 2549884d179dSJan Kara .mode = 0555, 2550884d179dSJan Kara .child = fs_dqstats_table, 2551884d179dSJan Kara }, 2552ab09203eSEric W. Biederman { }, 2553884d179dSJan Kara }; 2554884d179dSJan Kara 2555884d179dSJan Kara static ctl_table sys_table[] = { 2556884d179dSJan Kara { 2557884d179dSJan Kara .procname = "fs", 2558884d179dSJan Kara .mode = 0555, 2559884d179dSJan Kara .child = fs_table, 2560884d179dSJan Kara }, 2561ab09203eSEric W. Biederman { }, 2562884d179dSJan Kara }; 2563884d179dSJan Kara 2564884d179dSJan Kara static int __init dquot_init(void) 2565884d179dSJan Kara { 2566884d179dSJan Kara int i; 2567884d179dSJan Kara unsigned long nr_hash, order; 2568884d179dSJan Kara 2569884d179dSJan Kara printk(KERN_NOTICE "VFS: Disk quotas %s\n", __DQUOT_VERSION__); 2570884d179dSJan Kara 2571884d179dSJan Kara register_sysctl_table(sys_table); 2572884d179dSJan Kara 2573884d179dSJan Kara dquot_cachep = kmem_cache_create("dquot", 2574884d179dSJan Kara sizeof(struct dquot), sizeof(unsigned long) * 4, 2575884d179dSJan Kara (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| 2576884d179dSJan Kara SLAB_MEM_SPREAD|SLAB_PANIC), 2577884d179dSJan Kara NULL); 2578884d179dSJan Kara 2579884d179dSJan Kara order = 0; 2580884d179dSJan Kara dquot_hash = (struct hlist_head *)__get_free_pages(GFP_ATOMIC, order); 2581884d179dSJan Kara if (!dquot_hash) 2582884d179dSJan Kara panic("Cannot create dquot hash table"); 2583884d179dSJan Kara 2584884d179dSJan Kara /* Find power-of-two hlist_heads which can fit into allocation */ 2585884d179dSJan Kara nr_hash = (1UL << order) * PAGE_SIZE / sizeof(struct hlist_head); 2586884d179dSJan Kara dq_hash_bits = 0; 2587884d179dSJan Kara do { 2588884d179dSJan Kara dq_hash_bits++; 2589884d179dSJan Kara } while (nr_hash >> dq_hash_bits); 2590884d179dSJan Kara dq_hash_bits--; 2591884d179dSJan Kara 2592884d179dSJan Kara nr_hash = 1UL << dq_hash_bits; 2593884d179dSJan Kara dq_hash_mask = nr_hash - 1; 2594884d179dSJan Kara for (i = 0; i < nr_hash; i++) 2595884d179dSJan Kara INIT_HLIST_HEAD(dquot_hash + i); 2596884d179dSJan Kara 2597884d179dSJan Kara printk("Dquot-cache hash table entries: %ld (order %ld, %ld bytes)\n", 2598884d179dSJan Kara nr_hash, order, (PAGE_SIZE << order)); 2599884d179dSJan Kara 2600884d179dSJan Kara register_shrinker(&dqcache_shrinker); 2601884d179dSJan Kara 2602884d179dSJan Kara return 0; 2603884d179dSJan Kara } 2604884d179dSJan Kara module_init(dquot_init); 2605