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 320884d179dSJan Kara int dquot_mark_dquot_dirty(struct dquot *dquot) 321884d179dSJan Kara { 322884d179dSJan Kara spin_lock(&dq_list_lock); 323884d179dSJan Kara if (!test_and_set_bit(DQ_MOD_B, &dquot->dq_flags)) 324884d179dSJan Kara list_add(&dquot->dq_dirty, &sb_dqopt(dquot->dq_sb)-> 325884d179dSJan Kara info[dquot->dq_type].dqi_dirty_list); 326884d179dSJan Kara spin_unlock(&dq_list_lock); 327884d179dSJan Kara return 0; 328884d179dSJan Kara } 329884d179dSJan Kara EXPORT_SYMBOL(dquot_mark_dquot_dirty); 330884d179dSJan Kara 331dc52dd3aSDmitry Monakhov /* Dirtify all the dquots - this can block when journalling */ 332dc52dd3aSDmitry Monakhov static inline int mark_all_dquot_dirty(struct dquot * const *dquot) 333dc52dd3aSDmitry Monakhov { 334dc52dd3aSDmitry Monakhov int ret, err, cnt; 335dc52dd3aSDmitry Monakhov 336dc52dd3aSDmitry Monakhov ret = err = 0; 337dc52dd3aSDmitry Monakhov for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 338dc52dd3aSDmitry Monakhov if (dquot[cnt]) 339dc52dd3aSDmitry Monakhov /* Even in case of error we have to continue */ 340dc52dd3aSDmitry Monakhov ret = mark_dquot_dirty(dquot[cnt]); 341dc52dd3aSDmitry Monakhov if (!err) 342dc52dd3aSDmitry Monakhov err = ret; 343dc52dd3aSDmitry Monakhov } 344dc52dd3aSDmitry Monakhov return err; 345dc52dd3aSDmitry Monakhov } 346dc52dd3aSDmitry Monakhov 347dc52dd3aSDmitry Monakhov static inline void dqput_all(struct dquot **dquot) 348dc52dd3aSDmitry Monakhov { 349dc52dd3aSDmitry Monakhov unsigned int cnt; 350dc52dd3aSDmitry Monakhov 351dc52dd3aSDmitry Monakhov for (cnt = 0; cnt < MAXQUOTAS; cnt++) 352dc52dd3aSDmitry Monakhov dqput(dquot[cnt]); 353dc52dd3aSDmitry Monakhov } 354dc52dd3aSDmitry Monakhov 355884d179dSJan Kara /* This function needs dq_list_lock */ 356884d179dSJan Kara static inline int clear_dquot_dirty(struct dquot *dquot) 357884d179dSJan Kara { 358884d179dSJan Kara if (!test_and_clear_bit(DQ_MOD_B, &dquot->dq_flags)) 359884d179dSJan Kara return 0; 360884d179dSJan Kara list_del_init(&dquot->dq_dirty); 361884d179dSJan Kara return 1; 362884d179dSJan Kara } 363884d179dSJan Kara 364884d179dSJan Kara void mark_info_dirty(struct super_block *sb, int type) 365884d179dSJan Kara { 366884d179dSJan Kara set_bit(DQF_INFO_DIRTY_B, &sb_dqopt(sb)->info[type].dqi_flags); 367884d179dSJan Kara } 368884d179dSJan Kara EXPORT_SYMBOL(mark_info_dirty); 369884d179dSJan Kara 370884d179dSJan Kara /* 371884d179dSJan Kara * Read dquot from disk and alloc space for it 372884d179dSJan Kara */ 373884d179dSJan Kara 374884d179dSJan Kara int dquot_acquire(struct dquot *dquot) 375884d179dSJan Kara { 376884d179dSJan Kara int ret = 0, ret2 = 0; 377884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); 378884d179dSJan Kara 379884d179dSJan Kara mutex_lock(&dquot->dq_lock); 380884d179dSJan Kara mutex_lock(&dqopt->dqio_mutex); 381884d179dSJan Kara if (!test_bit(DQ_READ_B, &dquot->dq_flags)) 382884d179dSJan Kara ret = dqopt->ops[dquot->dq_type]->read_dqblk(dquot); 383884d179dSJan Kara if (ret < 0) 384884d179dSJan Kara goto out_iolock; 385884d179dSJan Kara set_bit(DQ_READ_B, &dquot->dq_flags); 386884d179dSJan Kara /* Instantiate dquot if needed */ 387884d179dSJan Kara if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && !dquot->dq_off) { 388884d179dSJan Kara ret = dqopt->ops[dquot->dq_type]->commit_dqblk(dquot); 389884d179dSJan Kara /* Write the info if needed */ 390268157baSJan Kara if (info_dirty(&dqopt->info[dquot->dq_type])) { 391268157baSJan Kara ret2 = dqopt->ops[dquot->dq_type]->write_file_info( 392268157baSJan Kara dquot->dq_sb, dquot->dq_type); 393268157baSJan Kara } 394884d179dSJan Kara if (ret < 0) 395884d179dSJan Kara goto out_iolock; 396884d179dSJan Kara if (ret2 < 0) { 397884d179dSJan Kara ret = ret2; 398884d179dSJan Kara goto out_iolock; 399884d179dSJan Kara } 400884d179dSJan Kara } 401884d179dSJan Kara set_bit(DQ_ACTIVE_B, &dquot->dq_flags); 402884d179dSJan Kara out_iolock: 403884d179dSJan Kara mutex_unlock(&dqopt->dqio_mutex); 404884d179dSJan Kara mutex_unlock(&dquot->dq_lock); 405884d179dSJan Kara return ret; 406884d179dSJan Kara } 407884d179dSJan Kara EXPORT_SYMBOL(dquot_acquire); 408884d179dSJan Kara 409884d179dSJan Kara /* 410884d179dSJan Kara * Write dquot to disk 411884d179dSJan Kara */ 412884d179dSJan Kara int dquot_commit(struct dquot *dquot) 413884d179dSJan Kara { 414884d179dSJan Kara int ret = 0, ret2 = 0; 415884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); 416884d179dSJan Kara 417884d179dSJan Kara mutex_lock(&dqopt->dqio_mutex); 418884d179dSJan Kara spin_lock(&dq_list_lock); 419884d179dSJan Kara if (!clear_dquot_dirty(dquot)) { 420884d179dSJan Kara spin_unlock(&dq_list_lock); 421884d179dSJan Kara goto out_sem; 422884d179dSJan Kara } 423884d179dSJan Kara spin_unlock(&dq_list_lock); 424884d179dSJan Kara /* Inactive dquot can be only if there was error during read/init 425884d179dSJan Kara * => we have better not writing it */ 426884d179dSJan Kara if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { 427884d179dSJan Kara ret = dqopt->ops[dquot->dq_type]->commit_dqblk(dquot); 428268157baSJan Kara if (info_dirty(&dqopt->info[dquot->dq_type])) { 429268157baSJan Kara ret2 = dqopt->ops[dquot->dq_type]->write_file_info( 430268157baSJan Kara dquot->dq_sb, dquot->dq_type); 431268157baSJan Kara } 432884d179dSJan Kara if (ret >= 0) 433884d179dSJan Kara ret = ret2; 434884d179dSJan Kara } 435884d179dSJan Kara out_sem: 436884d179dSJan Kara mutex_unlock(&dqopt->dqio_mutex); 437884d179dSJan Kara return ret; 438884d179dSJan Kara } 439884d179dSJan Kara EXPORT_SYMBOL(dquot_commit); 440884d179dSJan Kara 441884d179dSJan Kara /* 442884d179dSJan Kara * Release dquot 443884d179dSJan Kara */ 444884d179dSJan Kara int dquot_release(struct dquot *dquot) 445884d179dSJan Kara { 446884d179dSJan Kara int ret = 0, ret2 = 0; 447884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); 448884d179dSJan Kara 449884d179dSJan Kara mutex_lock(&dquot->dq_lock); 450884d179dSJan Kara /* Check whether we are not racing with some other dqget() */ 451884d179dSJan Kara if (atomic_read(&dquot->dq_count) > 1) 452884d179dSJan Kara goto out_dqlock; 453884d179dSJan Kara mutex_lock(&dqopt->dqio_mutex); 454884d179dSJan Kara if (dqopt->ops[dquot->dq_type]->release_dqblk) { 455884d179dSJan Kara ret = dqopt->ops[dquot->dq_type]->release_dqblk(dquot); 456884d179dSJan Kara /* Write the info */ 457268157baSJan Kara if (info_dirty(&dqopt->info[dquot->dq_type])) { 458268157baSJan Kara ret2 = dqopt->ops[dquot->dq_type]->write_file_info( 459268157baSJan Kara dquot->dq_sb, dquot->dq_type); 460268157baSJan Kara } 461884d179dSJan Kara if (ret >= 0) 462884d179dSJan Kara ret = ret2; 463884d179dSJan Kara } 464884d179dSJan Kara clear_bit(DQ_ACTIVE_B, &dquot->dq_flags); 465884d179dSJan Kara mutex_unlock(&dqopt->dqio_mutex); 466884d179dSJan Kara out_dqlock: 467884d179dSJan Kara mutex_unlock(&dquot->dq_lock); 468884d179dSJan Kara return ret; 469884d179dSJan Kara } 470884d179dSJan Kara EXPORT_SYMBOL(dquot_release); 471884d179dSJan Kara 472884d179dSJan Kara void dquot_destroy(struct dquot *dquot) 473884d179dSJan Kara { 474884d179dSJan Kara kmem_cache_free(dquot_cachep, dquot); 475884d179dSJan Kara } 476884d179dSJan Kara EXPORT_SYMBOL(dquot_destroy); 477884d179dSJan Kara 478884d179dSJan Kara static inline void do_destroy_dquot(struct dquot *dquot) 479884d179dSJan Kara { 480884d179dSJan Kara dquot->dq_sb->dq_op->destroy_dquot(dquot); 481884d179dSJan Kara } 482884d179dSJan Kara 483884d179dSJan Kara /* Invalidate all dquots on the list. Note that this function is called after 484884d179dSJan Kara * quota is disabled and pointers from inodes removed so there cannot be new 485884d179dSJan Kara * quota users. There can still be some users of quotas due to inodes being 486884d179dSJan Kara * just deleted or pruned by prune_icache() (those are not attached to any 487884d179dSJan Kara * list) or parallel quotactl call. We have to wait for such users. 488884d179dSJan Kara */ 489884d179dSJan Kara static void invalidate_dquots(struct super_block *sb, int type) 490884d179dSJan Kara { 491884d179dSJan Kara struct dquot *dquot, *tmp; 492884d179dSJan Kara 493884d179dSJan Kara restart: 494884d179dSJan Kara spin_lock(&dq_list_lock); 495884d179dSJan Kara list_for_each_entry_safe(dquot, tmp, &inuse_list, dq_inuse) { 496884d179dSJan Kara if (dquot->dq_sb != sb) 497884d179dSJan Kara continue; 498884d179dSJan Kara if (dquot->dq_type != type) 499884d179dSJan Kara continue; 500884d179dSJan Kara /* Wait for dquot users */ 501884d179dSJan Kara if (atomic_read(&dquot->dq_count)) { 502884d179dSJan Kara DEFINE_WAIT(wait); 503884d179dSJan Kara 504884d179dSJan Kara atomic_inc(&dquot->dq_count); 505884d179dSJan Kara prepare_to_wait(&dquot->dq_wait_unused, &wait, 506884d179dSJan Kara TASK_UNINTERRUPTIBLE); 507884d179dSJan Kara spin_unlock(&dq_list_lock); 508884d179dSJan Kara /* Once dqput() wakes us up, we know it's time to free 509884d179dSJan Kara * the dquot. 510884d179dSJan Kara * IMPORTANT: we rely on the fact that there is always 511884d179dSJan Kara * at most one process waiting for dquot to free. 512884d179dSJan Kara * Otherwise dq_count would be > 1 and we would never 513884d179dSJan Kara * wake up. 514884d179dSJan Kara */ 515884d179dSJan Kara if (atomic_read(&dquot->dq_count) > 1) 516884d179dSJan Kara schedule(); 517884d179dSJan Kara finish_wait(&dquot->dq_wait_unused, &wait); 518884d179dSJan Kara dqput(dquot); 519884d179dSJan Kara /* At this moment dquot() need not exist (it could be 520884d179dSJan Kara * reclaimed by prune_dqcache(). Hence we must 521884d179dSJan Kara * restart. */ 522884d179dSJan Kara goto restart; 523884d179dSJan Kara } 524884d179dSJan Kara /* 525884d179dSJan Kara * Quota now has no users and it has been written on last 526884d179dSJan Kara * dqput() 527884d179dSJan Kara */ 528884d179dSJan Kara remove_dquot_hash(dquot); 529884d179dSJan Kara remove_free_dquot(dquot); 530884d179dSJan Kara remove_inuse(dquot); 531884d179dSJan Kara do_destroy_dquot(dquot); 532884d179dSJan Kara } 533884d179dSJan Kara spin_unlock(&dq_list_lock); 534884d179dSJan Kara } 535884d179dSJan Kara 536884d179dSJan Kara /* Call callback for every active dquot on given filesystem */ 537884d179dSJan Kara int dquot_scan_active(struct super_block *sb, 538884d179dSJan Kara int (*fn)(struct dquot *dquot, unsigned long priv), 539884d179dSJan Kara unsigned long priv) 540884d179dSJan Kara { 541884d179dSJan Kara struct dquot *dquot, *old_dquot = NULL; 542884d179dSJan Kara int ret = 0; 543884d179dSJan Kara 544884d179dSJan Kara mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); 545884d179dSJan Kara spin_lock(&dq_list_lock); 546884d179dSJan Kara list_for_each_entry(dquot, &inuse_list, dq_inuse) { 547884d179dSJan Kara if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) 548884d179dSJan Kara continue; 549884d179dSJan Kara if (dquot->dq_sb != sb) 550884d179dSJan Kara continue; 551884d179dSJan Kara /* Now we have active dquot so we can just increase use count */ 552884d179dSJan Kara atomic_inc(&dquot->dq_count); 553884d179dSJan Kara dqstats.lookups++; 554884d179dSJan Kara spin_unlock(&dq_list_lock); 555884d179dSJan Kara dqput(old_dquot); 556884d179dSJan Kara old_dquot = dquot; 557884d179dSJan Kara ret = fn(dquot, priv); 558884d179dSJan Kara if (ret < 0) 559884d179dSJan Kara goto out; 560884d179dSJan Kara spin_lock(&dq_list_lock); 561884d179dSJan Kara /* We are safe to continue now because our dquot could not 562884d179dSJan Kara * be moved out of the inuse list while we hold the reference */ 563884d179dSJan Kara } 564884d179dSJan Kara spin_unlock(&dq_list_lock); 565884d179dSJan Kara out: 566884d179dSJan Kara dqput(old_dquot); 567884d179dSJan Kara mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); 568884d179dSJan Kara return ret; 569884d179dSJan Kara } 570884d179dSJan Kara EXPORT_SYMBOL(dquot_scan_active); 571884d179dSJan Kara 5725fb324adSChristoph Hellwig int vfs_quota_sync(struct super_block *sb, int type, int wait) 573884d179dSJan Kara { 574884d179dSJan Kara struct list_head *dirty; 575884d179dSJan Kara struct dquot *dquot; 576884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 577884d179dSJan Kara int cnt; 578884d179dSJan Kara 579884d179dSJan Kara mutex_lock(&dqopt->dqonoff_mutex); 580884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 581884d179dSJan Kara if (type != -1 && cnt != type) 582884d179dSJan Kara continue; 583884d179dSJan Kara if (!sb_has_quota_active(sb, cnt)) 584884d179dSJan Kara continue; 585884d179dSJan Kara spin_lock(&dq_list_lock); 586884d179dSJan Kara dirty = &dqopt->info[cnt].dqi_dirty_list; 587884d179dSJan Kara while (!list_empty(dirty)) { 588268157baSJan Kara dquot = list_first_entry(dirty, struct dquot, 589268157baSJan Kara dq_dirty); 590884d179dSJan Kara /* Dirty and inactive can be only bad dquot... */ 591884d179dSJan Kara if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { 592884d179dSJan Kara clear_dquot_dirty(dquot); 593884d179dSJan Kara continue; 594884d179dSJan Kara } 595884d179dSJan Kara /* Now we have active dquot from which someone is 596884d179dSJan Kara * holding reference so we can safely just increase 597884d179dSJan Kara * use count */ 598884d179dSJan Kara atomic_inc(&dquot->dq_count); 599884d179dSJan Kara dqstats.lookups++; 600884d179dSJan Kara spin_unlock(&dq_list_lock); 601884d179dSJan Kara sb->dq_op->write_dquot(dquot); 602884d179dSJan Kara dqput(dquot); 603884d179dSJan Kara spin_lock(&dq_list_lock); 604884d179dSJan Kara } 605884d179dSJan Kara spin_unlock(&dq_list_lock); 606884d179dSJan Kara } 607884d179dSJan Kara 608884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 609884d179dSJan Kara if ((cnt == type || type == -1) && sb_has_quota_active(sb, cnt) 610884d179dSJan Kara && info_dirty(&dqopt->info[cnt])) 611884d179dSJan Kara sb->dq_op->write_info(sb, cnt); 612884d179dSJan Kara spin_lock(&dq_list_lock); 613884d179dSJan Kara dqstats.syncs++; 614884d179dSJan Kara spin_unlock(&dq_list_lock); 615884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 616884d179dSJan Kara 6175fb324adSChristoph Hellwig if (!wait || (sb_dqopt(sb)->flags & DQUOT_QUOTA_SYS_FILE)) 6185fb324adSChristoph Hellwig return 0; 6195fb324adSChristoph Hellwig 6205fb324adSChristoph Hellwig /* This is not very clever (and fast) but currently I don't know about 6215fb324adSChristoph Hellwig * any other simple way of getting quota data to disk and we must get 6225fb324adSChristoph Hellwig * them there for userspace to be visible... */ 6235fb324adSChristoph Hellwig if (sb->s_op->sync_fs) 6245fb324adSChristoph Hellwig sb->s_op->sync_fs(sb, 1); 6255fb324adSChristoph Hellwig sync_blockdev(sb->s_bdev); 6265fb324adSChristoph Hellwig 6275fb324adSChristoph Hellwig /* 6285fb324adSChristoph Hellwig * Now when everything is written we can discard the pagecache so 6295fb324adSChristoph Hellwig * that userspace sees the changes. 6305fb324adSChristoph Hellwig */ 6315fb324adSChristoph Hellwig mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); 6325fb324adSChristoph Hellwig for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 6335fb324adSChristoph Hellwig if (type != -1 && cnt != type) 6345fb324adSChristoph Hellwig continue; 6355fb324adSChristoph Hellwig if (!sb_has_quota_active(sb, cnt)) 6365fb324adSChristoph Hellwig continue; 6375fb324adSChristoph Hellwig mutex_lock_nested(&sb_dqopt(sb)->files[cnt]->i_mutex, 6385fb324adSChristoph Hellwig I_MUTEX_QUOTA); 6395fb324adSChristoph Hellwig truncate_inode_pages(&sb_dqopt(sb)->files[cnt]->i_data, 0); 6405fb324adSChristoph Hellwig mutex_unlock(&sb_dqopt(sb)->files[cnt]->i_mutex); 6415fb324adSChristoph Hellwig } 6425fb324adSChristoph Hellwig mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); 6435fb324adSChristoph Hellwig 644884d179dSJan Kara return 0; 645884d179dSJan Kara } 646884d179dSJan Kara EXPORT_SYMBOL(vfs_quota_sync); 647884d179dSJan Kara 648884d179dSJan Kara /* Free unused dquots from cache */ 649884d179dSJan Kara static void prune_dqcache(int count) 650884d179dSJan Kara { 651884d179dSJan Kara struct list_head *head; 652884d179dSJan Kara struct dquot *dquot; 653884d179dSJan Kara 654884d179dSJan Kara head = free_dquots.prev; 655884d179dSJan Kara while (head != &free_dquots && count) { 656884d179dSJan Kara dquot = list_entry(head, struct dquot, dq_free); 657884d179dSJan Kara remove_dquot_hash(dquot); 658884d179dSJan Kara remove_free_dquot(dquot); 659884d179dSJan Kara remove_inuse(dquot); 660884d179dSJan Kara do_destroy_dquot(dquot); 661884d179dSJan Kara count--; 662884d179dSJan Kara head = free_dquots.prev; 663884d179dSJan Kara } 664884d179dSJan Kara } 665884d179dSJan Kara 666884d179dSJan Kara /* 667884d179dSJan Kara * This is called from kswapd when we think we need some 668884d179dSJan Kara * more memory 669884d179dSJan Kara */ 670884d179dSJan Kara 671884d179dSJan Kara static int shrink_dqcache_memory(int nr, gfp_t gfp_mask) 672884d179dSJan Kara { 673884d179dSJan Kara if (nr) { 674884d179dSJan Kara spin_lock(&dq_list_lock); 675884d179dSJan Kara prune_dqcache(nr); 676884d179dSJan Kara spin_unlock(&dq_list_lock); 677884d179dSJan Kara } 678884d179dSJan Kara return (dqstats.free_dquots / 100) * sysctl_vfs_cache_pressure; 679884d179dSJan Kara } 680884d179dSJan Kara 681884d179dSJan Kara static struct shrinker dqcache_shrinker = { 682884d179dSJan Kara .shrink = shrink_dqcache_memory, 683884d179dSJan Kara .seeks = DEFAULT_SEEKS, 684884d179dSJan Kara }; 685884d179dSJan Kara 686884d179dSJan Kara /* 687884d179dSJan Kara * Put reference to dquot 688884d179dSJan Kara * NOTE: If you change this function please check whether dqput_blocks() works right... 689884d179dSJan Kara */ 690884d179dSJan Kara void dqput(struct dquot *dquot) 691884d179dSJan Kara { 692884d179dSJan Kara int ret; 693884d179dSJan Kara 694884d179dSJan Kara if (!dquot) 695884d179dSJan Kara return; 69662af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 697884d179dSJan Kara if (!atomic_read(&dquot->dq_count)) { 698884d179dSJan Kara printk("VFS: dqput: trying to free free dquot\n"); 699884d179dSJan Kara printk("VFS: device %s, dquot of %s %d\n", 700884d179dSJan Kara dquot->dq_sb->s_id, 701884d179dSJan Kara quotatypes[dquot->dq_type], 702884d179dSJan Kara dquot->dq_id); 703884d179dSJan Kara BUG(); 704884d179dSJan Kara } 705884d179dSJan Kara #endif 706884d179dSJan Kara 707884d179dSJan Kara spin_lock(&dq_list_lock); 708884d179dSJan Kara dqstats.drops++; 709884d179dSJan Kara spin_unlock(&dq_list_lock); 710884d179dSJan Kara we_slept: 711884d179dSJan Kara spin_lock(&dq_list_lock); 712884d179dSJan Kara if (atomic_read(&dquot->dq_count) > 1) { 713884d179dSJan Kara /* We have more than one user... nothing to do */ 714884d179dSJan Kara atomic_dec(&dquot->dq_count); 715884d179dSJan Kara /* Releasing dquot during quotaoff phase? */ 716884d179dSJan Kara if (!sb_has_quota_active(dquot->dq_sb, dquot->dq_type) && 717884d179dSJan Kara atomic_read(&dquot->dq_count) == 1) 718884d179dSJan Kara wake_up(&dquot->dq_wait_unused); 719884d179dSJan Kara spin_unlock(&dq_list_lock); 720884d179dSJan Kara return; 721884d179dSJan Kara } 722884d179dSJan Kara /* Need to release dquot? */ 723884d179dSJan Kara if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && dquot_dirty(dquot)) { 724884d179dSJan Kara spin_unlock(&dq_list_lock); 725884d179dSJan Kara /* Commit dquot before releasing */ 726884d179dSJan Kara ret = dquot->dq_sb->dq_op->write_dquot(dquot); 727884d179dSJan Kara if (ret < 0) { 728884d179dSJan Kara printk(KERN_ERR "VFS: cannot write quota structure on " 729884d179dSJan Kara "device %s (error %d). Quota may get out of " 730884d179dSJan Kara "sync!\n", dquot->dq_sb->s_id, ret); 731884d179dSJan Kara /* 732884d179dSJan Kara * We clear dirty bit anyway, so that we avoid 733884d179dSJan Kara * infinite loop here 734884d179dSJan Kara */ 735884d179dSJan Kara spin_lock(&dq_list_lock); 736884d179dSJan Kara clear_dquot_dirty(dquot); 737884d179dSJan Kara spin_unlock(&dq_list_lock); 738884d179dSJan Kara } 739884d179dSJan Kara goto we_slept; 740884d179dSJan Kara } 741884d179dSJan Kara /* Clear flag in case dquot was inactive (something bad happened) */ 742884d179dSJan Kara clear_dquot_dirty(dquot); 743884d179dSJan Kara if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { 744884d179dSJan Kara spin_unlock(&dq_list_lock); 745884d179dSJan Kara dquot->dq_sb->dq_op->release_dquot(dquot); 746884d179dSJan Kara goto we_slept; 747884d179dSJan Kara } 748884d179dSJan Kara atomic_dec(&dquot->dq_count); 74962af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 750884d179dSJan Kara /* sanity check */ 751884d179dSJan Kara BUG_ON(!list_empty(&dquot->dq_free)); 752884d179dSJan Kara #endif 753884d179dSJan Kara put_dquot_last(dquot); 754884d179dSJan Kara spin_unlock(&dq_list_lock); 755884d179dSJan Kara } 756884d179dSJan Kara EXPORT_SYMBOL(dqput); 757884d179dSJan Kara 758884d179dSJan Kara struct dquot *dquot_alloc(struct super_block *sb, int type) 759884d179dSJan Kara { 760884d179dSJan Kara return kmem_cache_zalloc(dquot_cachep, GFP_NOFS); 761884d179dSJan Kara } 762884d179dSJan Kara EXPORT_SYMBOL(dquot_alloc); 763884d179dSJan Kara 764884d179dSJan Kara static struct dquot *get_empty_dquot(struct super_block *sb, int type) 765884d179dSJan Kara { 766884d179dSJan Kara struct dquot *dquot; 767884d179dSJan Kara 768884d179dSJan Kara dquot = sb->dq_op->alloc_dquot(sb, type); 769884d179dSJan Kara if(!dquot) 770dd6f3c6dSJan Kara return NULL; 771884d179dSJan Kara 772884d179dSJan Kara mutex_init(&dquot->dq_lock); 773884d179dSJan Kara INIT_LIST_HEAD(&dquot->dq_free); 774884d179dSJan Kara INIT_LIST_HEAD(&dquot->dq_inuse); 775884d179dSJan Kara INIT_HLIST_NODE(&dquot->dq_hash); 776884d179dSJan Kara INIT_LIST_HEAD(&dquot->dq_dirty); 777884d179dSJan Kara init_waitqueue_head(&dquot->dq_wait_unused); 778884d179dSJan Kara dquot->dq_sb = sb; 779884d179dSJan Kara dquot->dq_type = type; 780884d179dSJan Kara atomic_set(&dquot->dq_count, 1); 781884d179dSJan Kara 782884d179dSJan Kara return dquot; 783884d179dSJan Kara } 784884d179dSJan Kara 785884d179dSJan Kara /* 786884d179dSJan Kara * Get reference to dquot 787884d179dSJan Kara * 788884d179dSJan Kara * Locking is slightly tricky here. We are guarded from parallel quotaoff() 789884d179dSJan Kara * destroying our dquot by: 790884d179dSJan Kara * a) checking for quota flags under dq_list_lock and 791884d179dSJan Kara * b) getting a reference to dquot before we release dq_list_lock 792884d179dSJan Kara */ 793884d179dSJan Kara struct dquot *dqget(struct super_block *sb, unsigned int id, int type) 794884d179dSJan Kara { 795884d179dSJan Kara unsigned int hashent = hashfn(sb, id, type); 796dd6f3c6dSJan Kara struct dquot *dquot = NULL, *empty = NULL; 797884d179dSJan Kara 798884d179dSJan Kara if (!sb_has_quota_active(sb, type)) 799dd6f3c6dSJan Kara return NULL; 800884d179dSJan Kara we_slept: 801884d179dSJan Kara spin_lock(&dq_list_lock); 802884d179dSJan Kara spin_lock(&dq_state_lock); 803884d179dSJan Kara if (!sb_has_quota_active(sb, type)) { 804884d179dSJan Kara spin_unlock(&dq_state_lock); 805884d179dSJan Kara spin_unlock(&dq_list_lock); 806884d179dSJan Kara goto out; 807884d179dSJan Kara } 808884d179dSJan Kara spin_unlock(&dq_state_lock); 809884d179dSJan Kara 810dd6f3c6dSJan Kara dquot = find_dquot(hashent, sb, id, type); 811dd6f3c6dSJan Kara if (!dquot) { 812dd6f3c6dSJan Kara if (!empty) { 813884d179dSJan Kara spin_unlock(&dq_list_lock); 814dd6f3c6dSJan Kara empty = get_empty_dquot(sb, type); 815dd6f3c6dSJan Kara if (!empty) 816884d179dSJan Kara schedule(); /* Try to wait for a moment... */ 817884d179dSJan Kara goto we_slept; 818884d179dSJan Kara } 819884d179dSJan Kara dquot = empty; 820dd6f3c6dSJan Kara empty = NULL; 821884d179dSJan Kara dquot->dq_id = id; 822884d179dSJan Kara /* all dquots go on the inuse_list */ 823884d179dSJan Kara put_inuse(dquot); 824884d179dSJan Kara /* hash it first so it can be found */ 825884d179dSJan Kara insert_dquot_hash(dquot); 826884d179dSJan Kara dqstats.lookups++; 827884d179dSJan Kara spin_unlock(&dq_list_lock); 828884d179dSJan Kara } else { 829884d179dSJan Kara if (!atomic_read(&dquot->dq_count)) 830884d179dSJan Kara remove_free_dquot(dquot); 831884d179dSJan Kara atomic_inc(&dquot->dq_count); 832884d179dSJan Kara dqstats.cache_hits++; 833884d179dSJan Kara dqstats.lookups++; 834884d179dSJan Kara spin_unlock(&dq_list_lock); 835884d179dSJan Kara } 836268157baSJan Kara /* Wait for dq_lock - after this we know that either dquot_release() is 837268157baSJan Kara * already finished or it will be canceled due to dq_count > 1 test */ 838884d179dSJan Kara wait_on_dquot(dquot); 839268157baSJan Kara /* Read the dquot / allocate space in quota file */ 840268157baSJan Kara if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && 841268157baSJan Kara sb->dq_op->acquire_dquot(dquot) < 0) { 842884d179dSJan Kara dqput(dquot); 843dd6f3c6dSJan Kara dquot = NULL; 844884d179dSJan Kara goto out; 845884d179dSJan Kara } 84662af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 847884d179dSJan Kara BUG_ON(!dquot->dq_sb); /* Has somebody invalidated entry under us? */ 848884d179dSJan Kara #endif 849884d179dSJan Kara out: 850884d179dSJan Kara if (empty) 851884d179dSJan Kara do_destroy_dquot(empty); 852884d179dSJan Kara 853884d179dSJan Kara return dquot; 854884d179dSJan Kara } 855884d179dSJan Kara EXPORT_SYMBOL(dqget); 856884d179dSJan Kara 857884d179dSJan Kara static int dqinit_needed(struct inode *inode, int type) 858884d179dSJan Kara { 859884d179dSJan Kara int cnt; 860884d179dSJan Kara 861884d179dSJan Kara if (IS_NOQUOTA(inode)) 862884d179dSJan Kara return 0; 863884d179dSJan Kara if (type != -1) 864dd6f3c6dSJan Kara return !inode->i_dquot[type]; 865884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 866dd6f3c6dSJan Kara if (!inode->i_dquot[cnt]) 867884d179dSJan Kara return 1; 868884d179dSJan Kara return 0; 869884d179dSJan Kara } 870884d179dSJan Kara 871884d179dSJan Kara /* This routine is guarded by dqonoff_mutex mutex */ 872884d179dSJan Kara static void add_dquot_ref(struct super_block *sb, int type) 873884d179dSJan Kara { 874884d179dSJan Kara struct inode *inode, *old_inode = NULL; 87562af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 8760a5a9c72SJan Kara int reserved = 0; 8774c5e6c0eSJan Kara #endif 878884d179dSJan Kara 879884d179dSJan Kara spin_lock(&inode_lock); 880884d179dSJan Kara list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { 881b6fac63cSWu Fengguang if (inode->i_state & (I_FREEING|I_CLEAR|I_WILL_FREE|I_NEW)) 8823ae5080fSLinus Torvalds continue; 88362af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 8840a5a9c72SJan Kara if (unlikely(inode_get_rsv_space(inode) > 0)) 8850a5a9c72SJan Kara reserved = 1; 8864c5e6c0eSJan Kara #endif 887884d179dSJan Kara if (!atomic_read(&inode->i_writecount)) 888884d179dSJan Kara continue; 889884d179dSJan Kara if (!dqinit_needed(inode, type)) 890884d179dSJan Kara continue; 891884d179dSJan Kara 892884d179dSJan Kara __iget(inode); 893884d179dSJan Kara spin_unlock(&inode_lock); 894884d179dSJan Kara 895884d179dSJan Kara iput(old_inode); 896871a2931SChristoph Hellwig __dquot_initialize(inode, type); 897884d179dSJan Kara /* We hold a reference to 'inode' so it couldn't have been 898884d179dSJan Kara * removed from s_inodes list while we dropped the inode_lock. 899884d179dSJan Kara * We cannot iput the inode now as we can be holding the last 900884d179dSJan Kara * reference and we cannot iput it under inode_lock. So we 901884d179dSJan Kara * keep the reference and iput it later. */ 902884d179dSJan Kara old_inode = inode; 903884d179dSJan Kara spin_lock(&inode_lock); 904884d179dSJan Kara } 905884d179dSJan Kara spin_unlock(&inode_lock); 906884d179dSJan Kara iput(old_inode); 9070a5a9c72SJan Kara 90862af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 9090a5a9c72SJan Kara if (reserved) { 9100a5a9c72SJan Kara printk(KERN_WARNING "VFS (%s): Writes happened before quota" 9110a5a9c72SJan Kara " was turned on thus quota information is probably " 9120a5a9c72SJan Kara "inconsistent. Please run quotacheck(8).\n", sb->s_id); 9130a5a9c72SJan Kara } 9144c5e6c0eSJan Kara #endif 915884d179dSJan Kara } 916884d179dSJan Kara 917268157baSJan Kara /* 918268157baSJan Kara * Return 0 if dqput() won't block. 919268157baSJan Kara * (note that 1 doesn't necessarily mean blocking) 920268157baSJan Kara */ 921884d179dSJan Kara static inline int dqput_blocks(struct dquot *dquot) 922884d179dSJan Kara { 923884d179dSJan Kara if (atomic_read(&dquot->dq_count) <= 1) 924884d179dSJan Kara return 1; 925884d179dSJan Kara return 0; 926884d179dSJan Kara } 927884d179dSJan Kara 928268157baSJan Kara /* 929268157baSJan Kara * Remove references to dquots from inode and add dquot to list for freeing 930268157baSJan Kara * if we have the last referece to dquot 931268157baSJan Kara * We can't race with anybody because we hold dqptr_sem for writing... 932268157baSJan Kara */ 933884d179dSJan Kara static int remove_inode_dquot_ref(struct inode *inode, int type, 934884d179dSJan Kara struct list_head *tofree_head) 935884d179dSJan Kara { 936884d179dSJan Kara struct dquot *dquot = inode->i_dquot[type]; 937884d179dSJan Kara 938dd6f3c6dSJan Kara inode->i_dquot[type] = NULL; 939dd6f3c6dSJan Kara if (dquot) { 940884d179dSJan Kara if (dqput_blocks(dquot)) { 94162af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 942884d179dSJan Kara if (atomic_read(&dquot->dq_count) != 1) 943884d179dSJan Kara printk(KERN_WARNING "VFS: Adding dquot with dq_count %d to dispose list.\n", atomic_read(&dquot->dq_count)); 944884d179dSJan Kara #endif 945884d179dSJan Kara spin_lock(&dq_list_lock); 946268157baSJan Kara /* As dquot must have currently users it can't be on 947268157baSJan Kara * the free list... */ 948268157baSJan Kara list_add(&dquot->dq_free, tofree_head); 949884d179dSJan Kara spin_unlock(&dq_list_lock); 950884d179dSJan Kara return 1; 951884d179dSJan Kara } 952884d179dSJan Kara else 953884d179dSJan Kara dqput(dquot); /* We have guaranteed we won't block */ 954884d179dSJan Kara } 955884d179dSJan Kara return 0; 956884d179dSJan Kara } 957884d179dSJan Kara 958268157baSJan Kara /* 959268157baSJan Kara * Free list of dquots 960268157baSJan Kara * Dquots are removed from inodes and no new references can be got so we are 961268157baSJan Kara * the only ones holding reference 962268157baSJan Kara */ 963884d179dSJan Kara static void put_dquot_list(struct list_head *tofree_head) 964884d179dSJan Kara { 965884d179dSJan Kara struct list_head *act_head; 966884d179dSJan Kara struct dquot *dquot; 967884d179dSJan Kara 968884d179dSJan Kara act_head = tofree_head->next; 969884d179dSJan Kara while (act_head != tofree_head) { 970884d179dSJan Kara dquot = list_entry(act_head, struct dquot, dq_free); 971884d179dSJan Kara act_head = act_head->next; 972268157baSJan Kara /* Remove dquot from the list so we won't have problems... */ 973268157baSJan Kara list_del_init(&dquot->dq_free); 974884d179dSJan Kara dqput(dquot); 975884d179dSJan Kara } 976884d179dSJan Kara } 977884d179dSJan Kara 978884d179dSJan Kara static void remove_dquot_ref(struct super_block *sb, int type, 979884d179dSJan Kara struct list_head *tofree_head) 980884d179dSJan Kara { 981884d179dSJan Kara struct inode *inode; 982884d179dSJan Kara 983884d179dSJan Kara spin_lock(&inode_lock); 984884d179dSJan Kara list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { 9853ae5080fSLinus Torvalds /* 9863ae5080fSLinus Torvalds * We have to scan also I_NEW inodes because they can already 9873ae5080fSLinus Torvalds * have quota pointer initialized. Luckily, we need to touch 9883ae5080fSLinus Torvalds * only quota pointers and these have separate locking 9893ae5080fSLinus Torvalds * (dqptr_sem). 9903ae5080fSLinus Torvalds */ 991884d179dSJan Kara if (!IS_NOQUOTA(inode)) 992884d179dSJan Kara remove_inode_dquot_ref(inode, type, tofree_head); 993884d179dSJan Kara } 994884d179dSJan Kara spin_unlock(&inode_lock); 995884d179dSJan Kara } 996884d179dSJan Kara 997884d179dSJan Kara /* Gather all references from inodes and drop them */ 998884d179dSJan Kara static void drop_dquot_ref(struct super_block *sb, int type) 999884d179dSJan Kara { 1000884d179dSJan Kara LIST_HEAD(tofree_head); 1001884d179dSJan Kara 1002884d179dSJan Kara if (sb->dq_op) { 1003884d179dSJan Kara down_write(&sb_dqopt(sb)->dqptr_sem); 1004884d179dSJan Kara remove_dquot_ref(sb, type, &tofree_head); 1005884d179dSJan Kara up_write(&sb_dqopt(sb)->dqptr_sem); 1006884d179dSJan Kara put_dquot_list(&tofree_head); 1007884d179dSJan Kara } 1008884d179dSJan Kara } 1009884d179dSJan Kara 1010884d179dSJan Kara static inline void dquot_incr_inodes(struct dquot *dquot, qsize_t number) 1011884d179dSJan Kara { 1012884d179dSJan Kara dquot->dq_dqb.dqb_curinodes += number; 1013884d179dSJan Kara } 1014884d179dSJan Kara 1015884d179dSJan Kara static inline void dquot_incr_space(struct dquot *dquot, qsize_t number) 1016884d179dSJan Kara { 1017884d179dSJan Kara dquot->dq_dqb.dqb_curspace += number; 1018884d179dSJan Kara } 1019884d179dSJan Kara 1020884d179dSJan Kara static inline void dquot_resv_space(struct dquot *dquot, qsize_t number) 1021884d179dSJan Kara { 1022884d179dSJan Kara dquot->dq_dqb.dqb_rsvspace += number; 1023884d179dSJan Kara } 1024884d179dSJan Kara 1025884d179dSJan Kara /* 1026884d179dSJan Kara * Claim reserved quota space 1027884d179dSJan Kara */ 10280a5a9c72SJan Kara static void dquot_claim_reserved_space(struct dquot *dquot, qsize_t number) 1029884d179dSJan Kara { 10300a5a9c72SJan Kara if (dquot->dq_dqb.dqb_rsvspace < number) { 10310a5a9c72SJan Kara WARN_ON_ONCE(1); 10320a5a9c72SJan Kara number = dquot->dq_dqb.dqb_rsvspace; 10330a5a9c72SJan Kara } 1034884d179dSJan Kara dquot->dq_dqb.dqb_curspace += number; 1035884d179dSJan Kara dquot->dq_dqb.dqb_rsvspace -= number; 1036884d179dSJan Kara } 1037884d179dSJan Kara 1038884d179dSJan Kara static inline 1039884d179dSJan Kara void dquot_free_reserved_space(struct dquot *dquot, qsize_t number) 1040884d179dSJan Kara { 10410a5a9c72SJan Kara if (dquot->dq_dqb.dqb_rsvspace >= number) 1042884d179dSJan Kara dquot->dq_dqb.dqb_rsvspace -= number; 10430a5a9c72SJan Kara else { 10440a5a9c72SJan Kara WARN_ON_ONCE(1); 10450a5a9c72SJan Kara dquot->dq_dqb.dqb_rsvspace = 0; 10460a5a9c72SJan Kara } 1047884d179dSJan Kara } 1048884d179dSJan Kara 10497a2435d8SJan Kara static void dquot_decr_inodes(struct dquot *dquot, qsize_t number) 1050884d179dSJan Kara { 1051884d179dSJan Kara if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE || 1052884d179dSJan Kara dquot->dq_dqb.dqb_curinodes >= number) 1053884d179dSJan Kara dquot->dq_dqb.dqb_curinodes -= number; 1054884d179dSJan Kara else 1055884d179dSJan Kara dquot->dq_dqb.dqb_curinodes = 0; 1056884d179dSJan Kara if (dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit) 1057884d179dSJan Kara dquot->dq_dqb.dqb_itime = (time_t) 0; 1058884d179dSJan Kara clear_bit(DQ_INODES_B, &dquot->dq_flags); 1059884d179dSJan Kara } 1060884d179dSJan Kara 10617a2435d8SJan Kara static void dquot_decr_space(struct dquot *dquot, qsize_t number) 1062884d179dSJan Kara { 1063884d179dSJan Kara if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE || 1064884d179dSJan Kara dquot->dq_dqb.dqb_curspace >= number) 1065884d179dSJan Kara dquot->dq_dqb.dqb_curspace -= number; 1066884d179dSJan Kara else 1067884d179dSJan Kara dquot->dq_dqb.dqb_curspace = 0; 1068884d179dSJan Kara if (dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit) 1069884d179dSJan Kara dquot->dq_dqb.dqb_btime = (time_t) 0; 1070884d179dSJan Kara clear_bit(DQ_BLKS_B, &dquot->dq_flags); 1071884d179dSJan Kara } 1072884d179dSJan Kara 1073884d179dSJan Kara static int warning_issued(struct dquot *dquot, const int warntype) 1074884d179dSJan Kara { 1075884d179dSJan Kara int flag = (warntype == QUOTA_NL_BHARDWARN || 1076884d179dSJan Kara warntype == QUOTA_NL_BSOFTLONGWARN) ? DQ_BLKS_B : 1077884d179dSJan Kara ((warntype == QUOTA_NL_IHARDWARN || 1078884d179dSJan Kara warntype == QUOTA_NL_ISOFTLONGWARN) ? DQ_INODES_B : 0); 1079884d179dSJan Kara 1080884d179dSJan Kara if (!flag) 1081884d179dSJan Kara return 0; 1082884d179dSJan Kara return test_and_set_bit(flag, &dquot->dq_flags); 1083884d179dSJan Kara } 1084884d179dSJan Kara 1085884d179dSJan Kara #ifdef CONFIG_PRINT_QUOTA_WARNING 1086884d179dSJan Kara static int flag_print_warnings = 1; 1087884d179dSJan Kara 10887a2435d8SJan Kara static int need_print_warning(struct dquot *dquot) 1089884d179dSJan Kara { 1090884d179dSJan Kara if (!flag_print_warnings) 1091884d179dSJan Kara return 0; 1092884d179dSJan Kara 1093884d179dSJan Kara switch (dquot->dq_type) { 1094884d179dSJan Kara case USRQUOTA: 1095884d179dSJan Kara return current_fsuid() == dquot->dq_id; 1096884d179dSJan Kara case GRPQUOTA: 1097884d179dSJan Kara return in_group_p(dquot->dq_id); 1098884d179dSJan Kara } 1099884d179dSJan Kara return 0; 1100884d179dSJan Kara } 1101884d179dSJan Kara 1102884d179dSJan Kara /* Print warning to user which exceeded quota */ 1103884d179dSJan Kara static void print_warning(struct dquot *dquot, const int warntype) 1104884d179dSJan Kara { 1105884d179dSJan Kara char *msg = NULL; 1106884d179dSJan Kara struct tty_struct *tty; 1107884d179dSJan Kara 1108884d179dSJan Kara if (warntype == QUOTA_NL_IHARDBELOW || 1109884d179dSJan Kara warntype == QUOTA_NL_ISOFTBELOW || 1110884d179dSJan Kara warntype == QUOTA_NL_BHARDBELOW || 1111884d179dSJan Kara warntype == QUOTA_NL_BSOFTBELOW || !need_print_warning(dquot)) 1112884d179dSJan Kara return; 1113884d179dSJan Kara 1114884d179dSJan Kara tty = get_current_tty(); 1115884d179dSJan Kara if (!tty) 1116884d179dSJan Kara return; 1117884d179dSJan Kara tty_write_message(tty, dquot->dq_sb->s_id); 1118884d179dSJan Kara if (warntype == QUOTA_NL_ISOFTWARN || warntype == QUOTA_NL_BSOFTWARN) 1119884d179dSJan Kara tty_write_message(tty, ": warning, "); 1120884d179dSJan Kara else 1121884d179dSJan Kara tty_write_message(tty, ": write failed, "); 1122884d179dSJan Kara tty_write_message(tty, quotatypes[dquot->dq_type]); 1123884d179dSJan Kara switch (warntype) { 1124884d179dSJan Kara case QUOTA_NL_IHARDWARN: 1125884d179dSJan Kara msg = " file limit reached.\r\n"; 1126884d179dSJan Kara break; 1127884d179dSJan Kara case QUOTA_NL_ISOFTLONGWARN: 1128884d179dSJan Kara msg = " file quota exceeded too long.\r\n"; 1129884d179dSJan Kara break; 1130884d179dSJan Kara case QUOTA_NL_ISOFTWARN: 1131884d179dSJan Kara msg = " file quota exceeded.\r\n"; 1132884d179dSJan Kara break; 1133884d179dSJan Kara case QUOTA_NL_BHARDWARN: 1134884d179dSJan Kara msg = " block limit reached.\r\n"; 1135884d179dSJan Kara break; 1136884d179dSJan Kara case QUOTA_NL_BSOFTLONGWARN: 1137884d179dSJan Kara msg = " block quota exceeded too long.\r\n"; 1138884d179dSJan Kara break; 1139884d179dSJan Kara case QUOTA_NL_BSOFTWARN: 1140884d179dSJan Kara msg = " block quota exceeded.\r\n"; 1141884d179dSJan Kara break; 1142884d179dSJan Kara } 1143884d179dSJan Kara tty_write_message(tty, msg); 1144884d179dSJan Kara tty_kref_put(tty); 1145884d179dSJan Kara } 1146884d179dSJan Kara #endif 1147884d179dSJan Kara 1148884d179dSJan Kara /* 1149884d179dSJan Kara * Write warnings to the console and send warning messages over netlink. 1150884d179dSJan Kara * 1151884d179dSJan Kara * Note that this function can sleep. 1152884d179dSJan Kara */ 11537a2435d8SJan Kara static void flush_warnings(struct dquot *const *dquots, char *warntype) 1154884d179dSJan Kara { 115586e931a3SSteven Whitehouse struct dquot *dq; 1156884d179dSJan Kara int i; 1157884d179dSJan Kara 115886e931a3SSteven Whitehouse for (i = 0; i < MAXQUOTAS; i++) { 115986e931a3SSteven Whitehouse dq = dquots[i]; 116086e931a3SSteven Whitehouse if (dq && warntype[i] != QUOTA_NL_NOWARN && 116186e931a3SSteven Whitehouse !warning_issued(dq, warntype[i])) { 1162884d179dSJan Kara #ifdef CONFIG_PRINT_QUOTA_WARNING 116386e931a3SSteven Whitehouse print_warning(dq, warntype[i]); 1164884d179dSJan Kara #endif 116586e931a3SSteven Whitehouse quota_send_warning(dq->dq_type, dq->dq_id, 116686e931a3SSteven Whitehouse dq->dq_sb->s_dev, warntype[i]); 116786e931a3SSteven Whitehouse } 1168884d179dSJan Kara } 1169884d179dSJan Kara } 1170884d179dSJan Kara 11717a2435d8SJan Kara static int ignore_hardlimit(struct dquot *dquot) 1172884d179dSJan Kara { 1173884d179dSJan Kara struct mem_dqinfo *info = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_type]; 1174884d179dSJan Kara 1175884d179dSJan Kara return capable(CAP_SYS_RESOURCE) && 1176268157baSJan Kara (info->dqi_format->qf_fmt_id != QFMT_VFS_OLD || 1177268157baSJan Kara !(info->dqi_flags & V1_DQF_RSQUASH)); 1178884d179dSJan Kara } 1179884d179dSJan Kara 1180884d179dSJan Kara /* needs dq_data_lock */ 1181884d179dSJan Kara static int check_idq(struct dquot *dquot, qsize_t inodes, char *warntype) 1182884d179dSJan Kara { 1183268157baSJan Kara qsize_t newinodes = dquot->dq_dqb.dqb_curinodes + inodes; 1184268157baSJan Kara 1185884d179dSJan Kara *warntype = QUOTA_NL_NOWARN; 1186884d179dSJan Kara if (!sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_type) || 1187884d179dSJan Kara test_bit(DQ_FAKE_B, &dquot->dq_flags)) 1188efd8f0e6SChristoph Hellwig return 0; 1189884d179dSJan Kara 1190884d179dSJan Kara if (dquot->dq_dqb.dqb_ihardlimit && 1191268157baSJan Kara newinodes > dquot->dq_dqb.dqb_ihardlimit && 1192884d179dSJan Kara !ignore_hardlimit(dquot)) { 1193884d179dSJan Kara *warntype = QUOTA_NL_IHARDWARN; 1194efd8f0e6SChristoph Hellwig return -EDQUOT; 1195884d179dSJan Kara } 1196884d179dSJan Kara 1197884d179dSJan Kara if (dquot->dq_dqb.dqb_isoftlimit && 1198268157baSJan Kara newinodes > dquot->dq_dqb.dqb_isoftlimit && 1199268157baSJan Kara dquot->dq_dqb.dqb_itime && 1200268157baSJan Kara get_seconds() >= dquot->dq_dqb.dqb_itime && 1201884d179dSJan Kara !ignore_hardlimit(dquot)) { 1202884d179dSJan Kara *warntype = QUOTA_NL_ISOFTLONGWARN; 1203efd8f0e6SChristoph Hellwig return -EDQUOT; 1204884d179dSJan Kara } 1205884d179dSJan Kara 1206884d179dSJan Kara if (dquot->dq_dqb.dqb_isoftlimit && 1207268157baSJan Kara newinodes > dquot->dq_dqb.dqb_isoftlimit && 1208884d179dSJan Kara dquot->dq_dqb.dqb_itime == 0) { 1209884d179dSJan Kara *warntype = QUOTA_NL_ISOFTWARN; 1210268157baSJan Kara dquot->dq_dqb.dqb_itime = get_seconds() + 1211268157baSJan Kara sb_dqopt(dquot->dq_sb)->info[dquot->dq_type].dqi_igrace; 1212884d179dSJan Kara } 1213884d179dSJan Kara 1214efd8f0e6SChristoph Hellwig return 0; 1215884d179dSJan Kara } 1216884d179dSJan Kara 1217884d179dSJan Kara /* needs dq_data_lock */ 1218884d179dSJan Kara static int check_bdq(struct dquot *dquot, qsize_t space, int prealloc, char *warntype) 1219884d179dSJan Kara { 1220884d179dSJan Kara qsize_t tspace; 1221268157baSJan Kara struct super_block *sb = dquot->dq_sb; 1222884d179dSJan Kara 1223884d179dSJan Kara *warntype = QUOTA_NL_NOWARN; 1224268157baSJan Kara if (!sb_has_quota_limits_enabled(sb, dquot->dq_type) || 1225884d179dSJan Kara test_bit(DQ_FAKE_B, &dquot->dq_flags)) 1226efd8f0e6SChristoph Hellwig return 0; 1227884d179dSJan Kara 1228884d179dSJan Kara tspace = dquot->dq_dqb.dqb_curspace + dquot->dq_dqb.dqb_rsvspace 1229884d179dSJan Kara + space; 1230884d179dSJan Kara 1231884d179dSJan Kara if (dquot->dq_dqb.dqb_bhardlimit && 1232884d179dSJan Kara tspace > dquot->dq_dqb.dqb_bhardlimit && 1233884d179dSJan Kara !ignore_hardlimit(dquot)) { 1234884d179dSJan Kara if (!prealloc) 1235884d179dSJan Kara *warntype = QUOTA_NL_BHARDWARN; 1236efd8f0e6SChristoph Hellwig return -EDQUOT; 1237884d179dSJan Kara } 1238884d179dSJan Kara 1239884d179dSJan Kara if (dquot->dq_dqb.dqb_bsoftlimit && 1240884d179dSJan Kara tspace > dquot->dq_dqb.dqb_bsoftlimit && 1241268157baSJan Kara dquot->dq_dqb.dqb_btime && 1242268157baSJan Kara get_seconds() >= dquot->dq_dqb.dqb_btime && 1243884d179dSJan Kara !ignore_hardlimit(dquot)) { 1244884d179dSJan Kara if (!prealloc) 1245884d179dSJan Kara *warntype = QUOTA_NL_BSOFTLONGWARN; 1246efd8f0e6SChristoph Hellwig return -EDQUOT; 1247884d179dSJan Kara } 1248884d179dSJan Kara 1249884d179dSJan Kara if (dquot->dq_dqb.dqb_bsoftlimit && 1250884d179dSJan Kara tspace > dquot->dq_dqb.dqb_bsoftlimit && 1251884d179dSJan Kara dquot->dq_dqb.dqb_btime == 0) { 1252884d179dSJan Kara if (!prealloc) { 1253884d179dSJan Kara *warntype = QUOTA_NL_BSOFTWARN; 1254268157baSJan Kara dquot->dq_dqb.dqb_btime = get_seconds() + 1255268157baSJan Kara sb_dqopt(sb)->info[dquot->dq_type].dqi_bgrace; 1256884d179dSJan Kara } 1257884d179dSJan Kara else 1258884d179dSJan Kara /* 1259884d179dSJan Kara * We don't allow preallocation to exceed softlimit so exceeding will 1260884d179dSJan Kara * be always printed 1261884d179dSJan Kara */ 1262efd8f0e6SChristoph Hellwig return -EDQUOT; 1263884d179dSJan Kara } 1264884d179dSJan Kara 1265efd8f0e6SChristoph Hellwig return 0; 1266884d179dSJan Kara } 1267884d179dSJan Kara 1268884d179dSJan Kara static int info_idq_free(struct dquot *dquot, qsize_t inodes) 1269884d179dSJan Kara { 1270268157baSJan Kara qsize_t newinodes; 1271268157baSJan Kara 1272884d179dSJan Kara if (test_bit(DQ_FAKE_B, &dquot->dq_flags) || 1273884d179dSJan Kara dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit || 1274884d179dSJan Kara !sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_type)) 1275884d179dSJan Kara return QUOTA_NL_NOWARN; 1276884d179dSJan Kara 1277268157baSJan Kara newinodes = dquot->dq_dqb.dqb_curinodes - inodes; 1278268157baSJan Kara if (newinodes <= dquot->dq_dqb.dqb_isoftlimit) 1279884d179dSJan Kara return QUOTA_NL_ISOFTBELOW; 1280884d179dSJan Kara if (dquot->dq_dqb.dqb_curinodes >= dquot->dq_dqb.dqb_ihardlimit && 1281268157baSJan Kara newinodes < dquot->dq_dqb.dqb_ihardlimit) 1282884d179dSJan Kara return QUOTA_NL_IHARDBELOW; 1283884d179dSJan Kara return QUOTA_NL_NOWARN; 1284884d179dSJan Kara } 1285884d179dSJan Kara 1286884d179dSJan Kara static int info_bdq_free(struct dquot *dquot, qsize_t space) 1287884d179dSJan Kara { 1288884d179dSJan Kara if (test_bit(DQ_FAKE_B, &dquot->dq_flags) || 1289884d179dSJan Kara dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit) 1290884d179dSJan Kara return QUOTA_NL_NOWARN; 1291884d179dSJan Kara 1292884d179dSJan Kara if (dquot->dq_dqb.dqb_curspace - space <= dquot->dq_dqb.dqb_bsoftlimit) 1293884d179dSJan Kara return QUOTA_NL_BSOFTBELOW; 1294884d179dSJan Kara if (dquot->dq_dqb.dqb_curspace >= dquot->dq_dqb.dqb_bhardlimit && 1295884d179dSJan Kara dquot->dq_dqb.dqb_curspace - space < dquot->dq_dqb.dqb_bhardlimit) 1296884d179dSJan Kara return QUOTA_NL_BHARDBELOW; 1297884d179dSJan Kara return QUOTA_NL_NOWARN; 1298884d179dSJan Kara } 12990a5a9c72SJan Kara 1300884d179dSJan Kara /* 1301884d179dSJan Kara * Initialize quota pointers in inode 1302871a2931SChristoph Hellwig * 1303884d179dSJan Kara * We do things in a bit complicated way but by that we avoid calling 1304884d179dSJan Kara * dqget() and thus filesystem callbacks under dqptr_sem. 1305871a2931SChristoph Hellwig * 1306871a2931SChristoph Hellwig * It is better to call this function outside of any transaction as it 1307871a2931SChristoph Hellwig * might need a lot of space in journal for dquot structure allocation. 1308884d179dSJan Kara */ 1309871a2931SChristoph Hellwig static void __dquot_initialize(struct inode *inode, int type) 1310884d179dSJan Kara { 1311884d179dSJan Kara unsigned int id = 0; 1312871a2931SChristoph Hellwig int cnt; 1313ad1e6e8dSDmitry Monakhov struct dquot *got[MAXQUOTAS]; 1314884d179dSJan Kara struct super_block *sb = inode->i_sb; 13150a5a9c72SJan Kara qsize_t rsv; 1316884d179dSJan Kara 1317884d179dSJan Kara /* First test before acquiring mutex - solves deadlocks when we 1318884d179dSJan Kara * re-enter the quota code and are already holding the mutex */ 1319871a2931SChristoph Hellwig if (!sb_any_quota_active(inode->i_sb) || IS_NOQUOTA(inode)) 1320871a2931SChristoph Hellwig return; 1321884d179dSJan Kara 1322884d179dSJan Kara /* First get references to structures we might need. */ 1323884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1324ad1e6e8dSDmitry Monakhov got[cnt] = NULL; 1325884d179dSJan Kara if (type != -1 && cnt != type) 1326884d179dSJan Kara continue; 1327884d179dSJan Kara switch (cnt) { 1328884d179dSJan Kara case USRQUOTA: 1329884d179dSJan Kara id = inode->i_uid; 1330884d179dSJan Kara break; 1331884d179dSJan Kara case GRPQUOTA: 1332884d179dSJan Kara id = inode->i_gid; 1333884d179dSJan Kara break; 1334884d179dSJan Kara } 1335884d179dSJan Kara got[cnt] = dqget(sb, id, cnt); 1336884d179dSJan Kara } 1337884d179dSJan Kara 1338884d179dSJan Kara down_write(&sb_dqopt(sb)->dqptr_sem); 1339884d179dSJan Kara if (IS_NOQUOTA(inode)) 1340884d179dSJan Kara goto out_err; 1341884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1342884d179dSJan Kara if (type != -1 && cnt != type) 1343884d179dSJan Kara continue; 1344884d179dSJan Kara /* Avoid races with quotaoff() */ 1345884d179dSJan Kara if (!sb_has_quota_active(sb, cnt)) 1346884d179dSJan Kara continue; 1347dd6f3c6dSJan Kara if (!inode->i_dquot[cnt]) { 1348884d179dSJan Kara inode->i_dquot[cnt] = got[cnt]; 1349dd6f3c6dSJan Kara got[cnt] = NULL; 13500a5a9c72SJan Kara /* 13510a5a9c72SJan Kara * Make quota reservation system happy if someone 13520a5a9c72SJan Kara * did a write before quota was turned on 13530a5a9c72SJan Kara */ 13540a5a9c72SJan Kara rsv = inode_get_rsv_space(inode); 13550a5a9c72SJan Kara if (unlikely(rsv)) 13560a5a9c72SJan Kara dquot_resv_space(inode->i_dquot[cnt], rsv); 1357884d179dSJan Kara } 1358884d179dSJan Kara } 1359884d179dSJan Kara out_err: 1360884d179dSJan Kara up_write(&sb_dqopt(sb)->dqptr_sem); 1361884d179dSJan Kara /* Drop unused references */ 1362dc52dd3aSDmitry Monakhov dqput_all(got); 1363871a2931SChristoph Hellwig } 1364871a2931SChristoph Hellwig 1365871a2931SChristoph Hellwig void dquot_initialize(struct inode *inode) 1366871a2931SChristoph Hellwig { 1367871a2931SChristoph Hellwig __dquot_initialize(inode, -1); 1368884d179dSJan Kara } 1369884d179dSJan Kara EXPORT_SYMBOL(dquot_initialize); 1370884d179dSJan Kara 1371884d179dSJan Kara /* 1372884d179dSJan Kara * Release all quotas referenced by inode 1373884d179dSJan Kara */ 13749f754758SChristoph Hellwig static void __dquot_drop(struct inode *inode) 1375884d179dSJan Kara { 1376884d179dSJan Kara int cnt; 1377884d179dSJan Kara struct dquot *put[MAXQUOTAS]; 1378884d179dSJan Kara 1379884d179dSJan Kara down_write(&sb_dqopt(inode->i_sb)->dqptr_sem); 1380884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1381884d179dSJan Kara put[cnt] = inode->i_dquot[cnt]; 1382dd6f3c6dSJan Kara inode->i_dquot[cnt] = NULL; 1383884d179dSJan Kara } 1384884d179dSJan Kara up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); 1385dc52dd3aSDmitry Monakhov dqput_all(put); 1386884d179dSJan Kara } 1387884d179dSJan Kara 13889f754758SChristoph Hellwig void dquot_drop(struct inode *inode) 1389884d179dSJan Kara { 1390884d179dSJan Kara int cnt; 13919f754758SChristoph Hellwig 13929f754758SChristoph Hellwig if (IS_NOQUOTA(inode)) 13939f754758SChristoph Hellwig return; 13949f754758SChristoph Hellwig 13959f754758SChristoph Hellwig /* 13969f754758SChristoph Hellwig * Test before calling to rule out calls from proc and such 1397884d179dSJan Kara * where we are not allowed to block. Note that this is 1398884d179dSJan Kara * actually reliable test even without the lock - the caller 1399884d179dSJan Kara * must assure that nobody can come after the DQUOT_DROP and 14009f754758SChristoph Hellwig * add quota pointers back anyway. 14019f754758SChristoph Hellwig */ 14029f754758SChristoph Hellwig for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1403dd6f3c6dSJan Kara if (inode->i_dquot[cnt]) 1404884d179dSJan Kara break; 14059f754758SChristoph Hellwig } 14069f754758SChristoph Hellwig 1407884d179dSJan Kara if (cnt < MAXQUOTAS) 14089f754758SChristoph Hellwig __dquot_drop(inode); 1409884d179dSJan Kara } 14109f754758SChristoph Hellwig EXPORT_SYMBOL(dquot_drop); 1411884d179dSJan Kara 1412884d179dSJan Kara /* 1413fd8fbfc1SDmitry Monakhov * inode_reserved_space is managed internally by quota, and protected by 1414fd8fbfc1SDmitry Monakhov * i_lock similar to i_blocks+i_bytes. 1415fd8fbfc1SDmitry Monakhov */ 1416fd8fbfc1SDmitry Monakhov static qsize_t *inode_reserved_space(struct inode * inode) 1417fd8fbfc1SDmitry Monakhov { 1418fd8fbfc1SDmitry Monakhov /* Filesystem must explicitly define it's own method in order to use 1419fd8fbfc1SDmitry Monakhov * quota reservation interface */ 1420fd8fbfc1SDmitry Monakhov BUG_ON(!inode->i_sb->dq_op->get_reserved_space); 1421fd8fbfc1SDmitry Monakhov return inode->i_sb->dq_op->get_reserved_space(inode); 1422fd8fbfc1SDmitry Monakhov } 1423fd8fbfc1SDmitry Monakhov 1424c469070aSDmitry Monakhov void inode_add_rsv_space(struct inode *inode, qsize_t number) 1425fd8fbfc1SDmitry Monakhov { 1426fd8fbfc1SDmitry Monakhov spin_lock(&inode->i_lock); 1427fd8fbfc1SDmitry Monakhov *inode_reserved_space(inode) += number; 1428fd8fbfc1SDmitry Monakhov spin_unlock(&inode->i_lock); 1429fd8fbfc1SDmitry Monakhov } 1430c469070aSDmitry Monakhov EXPORT_SYMBOL(inode_add_rsv_space); 1431fd8fbfc1SDmitry Monakhov 1432c469070aSDmitry Monakhov void inode_claim_rsv_space(struct inode *inode, qsize_t number) 1433fd8fbfc1SDmitry Monakhov { 1434fd8fbfc1SDmitry Monakhov spin_lock(&inode->i_lock); 1435fd8fbfc1SDmitry Monakhov *inode_reserved_space(inode) -= number; 1436fd8fbfc1SDmitry Monakhov __inode_add_bytes(inode, number); 1437fd8fbfc1SDmitry Monakhov spin_unlock(&inode->i_lock); 1438fd8fbfc1SDmitry Monakhov } 1439c469070aSDmitry Monakhov EXPORT_SYMBOL(inode_claim_rsv_space); 1440fd8fbfc1SDmitry Monakhov 1441c469070aSDmitry Monakhov void inode_sub_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 spin_unlock(&inode->i_lock); 1446fd8fbfc1SDmitry Monakhov } 1447c469070aSDmitry Monakhov EXPORT_SYMBOL(inode_sub_rsv_space); 1448fd8fbfc1SDmitry Monakhov 1449fd8fbfc1SDmitry Monakhov static qsize_t inode_get_rsv_space(struct inode *inode) 1450fd8fbfc1SDmitry Monakhov { 1451fd8fbfc1SDmitry Monakhov qsize_t ret; 145205b5d898SJan Kara 145305b5d898SJan Kara if (!inode->i_sb->dq_op->get_reserved_space) 145405b5d898SJan Kara return 0; 1455fd8fbfc1SDmitry Monakhov spin_lock(&inode->i_lock); 1456fd8fbfc1SDmitry Monakhov ret = *inode_reserved_space(inode); 1457fd8fbfc1SDmitry Monakhov spin_unlock(&inode->i_lock); 1458fd8fbfc1SDmitry Monakhov return ret; 1459fd8fbfc1SDmitry Monakhov } 1460fd8fbfc1SDmitry Monakhov 1461fd8fbfc1SDmitry Monakhov static void inode_incr_space(struct inode *inode, qsize_t number, 1462fd8fbfc1SDmitry Monakhov int reserve) 1463fd8fbfc1SDmitry Monakhov { 1464fd8fbfc1SDmitry Monakhov if (reserve) 1465fd8fbfc1SDmitry Monakhov inode_add_rsv_space(inode, number); 1466fd8fbfc1SDmitry Monakhov else 1467fd8fbfc1SDmitry Monakhov inode_add_bytes(inode, number); 1468fd8fbfc1SDmitry Monakhov } 1469fd8fbfc1SDmitry Monakhov 1470fd8fbfc1SDmitry Monakhov static void inode_decr_space(struct inode *inode, qsize_t number, int reserve) 1471fd8fbfc1SDmitry Monakhov { 1472fd8fbfc1SDmitry Monakhov if (reserve) 1473fd8fbfc1SDmitry Monakhov inode_sub_rsv_space(inode, number); 1474fd8fbfc1SDmitry Monakhov else 1475fd8fbfc1SDmitry Monakhov inode_sub_bytes(inode, number); 1476fd8fbfc1SDmitry Monakhov } 1477fd8fbfc1SDmitry Monakhov 1478fd8fbfc1SDmitry Monakhov /* 14795dd4056dSChristoph Hellwig * This functions updates i_blocks+i_bytes fields and quota information 14805dd4056dSChristoph Hellwig * (together with appropriate checks). 14815dd4056dSChristoph Hellwig * 14825dd4056dSChristoph Hellwig * NOTE: We absolutely rely on the fact that caller dirties the inode 14835dd4056dSChristoph Hellwig * (usually helpers in quotaops.h care about this) and holds a handle for 14845dd4056dSChristoph Hellwig * the current transaction so that dquot write and inode write go into the 14855dd4056dSChristoph Hellwig * same transaction. 1486884d179dSJan Kara */ 1487884d179dSJan Kara 1488884d179dSJan Kara /* 1489884d179dSJan Kara * This operation can block, but only after everything is updated 1490884d179dSJan Kara */ 149156246f9aSEric Sandeen int __dquot_alloc_space(struct inode *inode, qsize_t number, int flags) 1492884d179dSJan Kara { 14935dd4056dSChristoph Hellwig int cnt, ret = 0; 1494884d179dSJan Kara char warntype[MAXQUOTAS]; 149556246f9aSEric Sandeen int warn = flags & DQUOT_SPACE_WARN; 149656246f9aSEric Sandeen int reserve = flags & DQUOT_SPACE_RESERVE; 1497*0e05842bSEric Sandeen int nofail = flags & DQUOT_SPACE_NOFAIL; 1498884d179dSJan Kara 1499fd8fbfc1SDmitry Monakhov /* 1500fd8fbfc1SDmitry Monakhov * First test before acquiring mutex - solves deadlocks when we 1501fd8fbfc1SDmitry Monakhov * re-enter the quota code and are already holding the mutex 1502fd8fbfc1SDmitry Monakhov */ 15035dd4056dSChristoph Hellwig if (!sb_any_quota_active(inode->i_sb) || IS_NOQUOTA(inode)) { 1504fd8fbfc1SDmitry Monakhov inode_incr_space(inode, number, reserve); 1505fd8fbfc1SDmitry Monakhov goto out; 1506fd8fbfc1SDmitry Monakhov } 1507fd8fbfc1SDmitry Monakhov 1508fd8fbfc1SDmitry Monakhov down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1509884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 1510884d179dSJan Kara warntype[cnt] = QUOTA_NL_NOWARN; 1511884d179dSJan Kara 1512884d179dSJan Kara spin_lock(&dq_data_lock); 1513884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1514dd6f3c6dSJan Kara if (!inode->i_dquot[cnt]) 1515884d179dSJan Kara continue; 1516efd8f0e6SChristoph Hellwig ret = check_bdq(inode->i_dquot[cnt], number, !warn, 1517efd8f0e6SChristoph Hellwig warntype+cnt); 1518*0e05842bSEric Sandeen if (ret && !nofail) { 1519fd8fbfc1SDmitry Monakhov spin_unlock(&dq_data_lock); 1520fd8fbfc1SDmitry Monakhov goto out_flush_warn; 1521884d179dSJan Kara } 1522884d179dSJan Kara } 1523884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1524dd6f3c6dSJan Kara if (!inode->i_dquot[cnt]) 1525884d179dSJan Kara continue; 1526884d179dSJan Kara if (reserve) 1527884d179dSJan Kara dquot_resv_space(inode->i_dquot[cnt], number); 1528884d179dSJan Kara else 1529884d179dSJan Kara dquot_incr_space(inode->i_dquot[cnt], number); 1530884d179dSJan Kara } 1531fd8fbfc1SDmitry Monakhov inode_incr_space(inode, number, reserve); 1532884d179dSJan Kara spin_unlock(&dq_data_lock); 1533fd8fbfc1SDmitry Monakhov 1534fd8fbfc1SDmitry Monakhov if (reserve) 1535fd8fbfc1SDmitry Monakhov goto out_flush_warn; 1536dc52dd3aSDmitry Monakhov mark_all_dquot_dirty(inode->i_dquot); 1537fd8fbfc1SDmitry Monakhov out_flush_warn: 1538884d179dSJan Kara flush_warnings(inode->i_dquot, warntype); 1539fd8fbfc1SDmitry Monakhov up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1540fd8fbfc1SDmitry Monakhov out: 1541884d179dSJan Kara return ret; 1542884d179dSJan Kara } 15435dd4056dSChristoph Hellwig EXPORT_SYMBOL(__dquot_alloc_space); 1544884d179dSJan Kara 1545884d179dSJan Kara /* 1546884d179dSJan Kara * This operation can block, but only after everything is updated 1547884d179dSJan Kara */ 154863936ddaSChristoph Hellwig int dquot_alloc_inode(const struct inode *inode) 1549884d179dSJan Kara { 1550efd8f0e6SChristoph Hellwig int cnt, ret = 0; 1551884d179dSJan Kara char warntype[MAXQUOTAS]; 1552884d179dSJan Kara 1553884d179dSJan Kara /* First test before acquiring mutex - solves deadlocks when we 1554884d179dSJan Kara * re-enter the quota code and are already holding the mutex */ 155563936ddaSChristoph Hellwig if (!sb_any_quota_active(inode->i_sb) || IS_NOQUOTA(inode)) 155663936ddaSChristoph Hellwig return 0; 1557884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 1558884d179dSJan Kara warntype[cnt] = QUOTA_NL_NOWARN; 1559884d179dSJan Kara down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1560884d179dSJan Kara spin_lock(&dq_data_lock); 1561884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1562dd6f3c6dSJan Kara if (!inode->i_dquot[cnt]) 1563884d179dSJan Kara continue; 1564efd8f0e6SChristoph Hellwig ret = check_idq(inode->i_dquot[cnt], 1, warntype + cnt); 1565efd8f0e6SChristoph Hellwig if (ret) 1566884d179dSJan Kara goto warn_put_all; 1567884d179dSJan Kara } 1568884d179dSJan Kara 1569884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1570dd6f3c6dSJan Kara if (!inode->i_dquot[cnt]) 1571884d179dSJan Kara continue; 157263936ddaSChristoph Hellwig dquot_incr_inodes(inode->i_dquot[cnt], 1); 1573884d179dSJan Kara } 1574efd8f0e6SChristoph Hellwig 1575884d179dSJan Kara warn_put_all: 1576884d179dSJan Kara spin_unlock(&dq_data_lock); 157763936ddaSChristoph Hellwig if (ret == 0) 1578dc52dd3aSDmitry Monakhov mark_all_dquot_dirty(inode->i_dquot); 1579884d179dSJan Kara flush_warnings(inode->i_dquot, warntype); 1580884d179dSJan Kara up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1581884d179dSJan Kara return ret; 1582884d179dSJan Kara } 1583884d179dSJan Kara EXPORT_SYMBOL(dquot_alloc_inode); 1584884d179dSJan Kara 15855dd4056dSChristoph Hellwig /* 15865dd4056dSChristoph Hellwig * Convert in-memory reserved quotas to real consumed quotas 15875dd4056dSChristoph Hellwig */ 15885dd4056dSChristoph Hellwig int dquot_claim_space_nodirty(struct inode *inode, qsize_t number) 1589884d179dSJan Kara { 1590884d179dSJan Kara int cnt; 1591884d179dSJan Kara 15925dd4056dSChristoph Hellwig if (!sb_any_quota_active(inode->i_sb) || IS_NOQUOTA(inode)) { 1593fd8fbfc1SDmitry Monakhov inode_claim_rsv_space(inode, number); 15945dd4056dSChristoph Hellwig return 0; 1595884d179dSJan Kara } 1596884d179dSJan Kara 1597884d179dSJan Kara down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1598884d179dSJan Kara spin_lock(&dq_data_lock); 1599884d179dSJan Kara /* Claim reserved quotas to allocated quotas */ 1600884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1601dd6f3c6dSJan Kara if (inode->i_dquot[cnt]) 1602884d179dSJan Kara dquot_claim_reserved_space(inode->i_dquot[cnt], 1603884d179dSJan Kara number); 1604884d179dSJan Kara } 1605884d179dSJan Kara /* Update inode bytes */ 1606fd8fbfc1SDmitry Monakhov inode_claim_rsv_space(inode, number); 1607884d179dSJan Kara spin_unlock(&dq_data_lock); 1608dc52dd3aSDmitry Monakhov mark_all_dquot_dirty(inode->i_dquot); 1609884d179dSJan Kara up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 16105dd4056dSChristoph Hellwig return 0; 1611884d179dSJan Kara } 16125dd4056dSChristoph Hellwig EXPORT_SYMBOL(dquot_claim_space_nodirty); 1613884d179dSJan Kara 1614884d179dSJan Kara /* 1615884d179dSJan Kara * This operation can block, but only after everything is updated 1616884d179dSJan Kara */ 161756246f9aSEric Sandeen void __dquot_free_space(struct inode *inode, qsize_t number, int flags) 1618884d179dSJan Kara { 1619884d179dSJan Kara unsigned int cnt; 1620884d179dSJan Kara char warntype[MAXQUOTAS]; 162156246f9aSEric Sandeen int reserve = flags & DQUOT_SPACE_RESERVE; 1622884d179dSJan Kara 1623884d179dSJan Kara /* First test before acquiring mutex - solves deadlocks when we 1624884d179dSJan Kara * re-enter the quota code and are already holding the mutex */ 16255dd4056dSChristoph Hellwig if (!sb_any_quota_active(inode->i_sb) || IS_NOQUOTA(inode)) { 1626fd8fbfc1SDmitry Monakhov inode_decr_space(inode, number, reserve); 16275dd4056dSChristoph Hellwig return; 1628884d179dSJan Kara } 1629884d179dSJan Kara 1630884d179dSJan Kara down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1631884d179dSJan Kara spin_lock(&dq_data_lock); 1632884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1633dd6f3c6dSJan Kara if (!inode->i_dquot[cnt]) 1634884d179dSJan Kara continue; 1635884d179dSJan Kara warntype[cnt] = info_bdq_free(inode->i_dquot[cnt], number); 1636fd8fbfc1SDmitry Monakhov if (reserve) 1637fd8fbfc1SDmitry Monakhov dquot_free_reserved_space(inode->i_dquot[cnt], number); 1638fd8fbfc1SDmitry Monakhov else 1639884d179dSJan Kara dquot_decr_space(inode->i_dquot[cnt], number); 1640884d179dSJan Kara } 1641fd8fbfc1SDmitry Monakhov inode_decr_space(inode, number, reserve); 1642884d179dSJan Kara spin_unlock(&dq_data_lock); 1643fd8fbfc1SDmitry Monakhov 1644fd8fbfc1SDmitry Monakhov if (reserve) 1645fd8fbfc1SDmitry Monakhov goto out_unlock; 1646dc52dd3aSDmitry Monakhov mark_all_dquot_dirty(inode->i_dquot); 1647fd8fbfc1SDmitry Monakhov out_unlock: 1648884d179dSJan Kara flush_warnings(inode->i_dquot, warntype); 1649884d179dSJan Kara up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1650884d179dSJan Kara } 16515dd4056dSChristoph Hellwig EXPORT_SYMBOL(__dquot_free_space); 1652fd8fbfc1SDmitry Monakhov 1653fd8fbfc1SDmitry Monakhov /* 1654884d179dSJan Kara * This operation can block, but only after everything is updated 1655884d179dSJan Kara */ 165663936ddaSChristoph Hellwig void dquot_free_inode(const struct inode *inode) 1657884d179dSJan Kara { 1658884d179dSJan Kara unsigned int cnt; 1659884d179dSJan Kara char warntype[MAXQUOTAS]; 1660884d179dSJan Kara 1661884d179dSJan Kara /* First test before acquiring mutex - solves deadlocks when we 1662884d179dSJan Kara * re-enter the quota code and are already holding the mutex */ 166363936ddaSChristoph Hellwig if (!sb_any_quota_active(inode->i_sb) || IS_NOQUOTA(inode)) 166463936ddaSChristoph Hellwig return; 1665884d179dSJan Kara 1666884d179dSJan Kara down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1667884d179dSJan Kara spin_lock(&dq_data_lock); 1668884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1669dd6f3c6dSJan Kara if (!inode->i_dquot[cnt]) 1670884d179dSJan Kara continue; 167163936ddaSChristoph Hellwig warntype[cnt] = info_idq_free(inode->i_dquot[cnt], 1); 167263936ddaSChristoph Hellwig dquot_decr_inodes(inode->i_dquot[cnt], 1); 1673884d179dSJan Kara } 1674884d179dSJan Kara spin_unlock(&dq_data_lock); 1675dc52dd3aSDmitry Monakhov mark_all_dquot_dirty(inode->i_dquot); 1676884d179dSJan Kara flush_warnings(inode->i_dquot, warntype); 1677884d179dSJan Kara up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1678884d179dSJan Kara } 1679884d179dSJan Kara EXPORT_SYMBOL(dquot_free_inode); 1680884d179dSJan Kara 1681884d179dSJan Kara /* 1682884d179dSJan Kara * Transfer the number of inode and blocks from one diskquota to an other. 1683884d179dSJan Kara * 1684884d179dSJan Kara * This operation can block, but only after everything is updated 1685884d179dSJan Kara * A transaction must be started when entering this function. 1686884d179dSJan Kara */ 1687b43fa828SChristoph Hellwig static int __dquot_transfer(struct inode *inode, qid_t *chid, unsigned long mask) 1688884d179dSJan Kara { 1689884d179dSJan Kara qsize_t space, cur_space; 1690884d179dSJan Kara qsize_t rsv_space = 0; 1691884d179dSJan Kara struct dquot *transfer_from[MAXQUOTAS]; 1692884d179dSJan Kara struct dquot *transfer_to[MAXQUOTAS]; 1693efd8f0e6SChristoph Hellwig int cnt, ret = 0; 1694884d179dSJan Kara char warntype_to[MAXQUOTAS]; 1695884d179dSJan Kara char warntype_from_inodes[MAXQUOTAS], warntype_from_space[MAXQUOTAS]; 1696884d179dSJan Kara 1697884d179dSJan Kara /* First test before acquiring mutex - solves deadlocks when we 1698884d179dSJan Kara * re-enter the quota code and are already holding the mutex */ 1699884d179dSJan Kara if (IS_NOQUOTA(inode)) 1700efd8f0e6SChristoph Hellwig return 0; 1701884d179dSJan Kara /* Initialize the arrays */ 1702884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1703dd6f3c6dSJan Kara transfer_from[cnt] = NULL; 1704dd6f3c6dSJan Kara transfer_to[cnt] = NULL; 1705884d179dSJan Kara warntype_to[cnt] = QUOTA_NL_NOWARN; 1706884d179dSJan Kara } 17078ddd69d6SDmitry Monakhov for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 17088ddd69d6SDmitry Monakhov if (mask & (1 << cnt)) 17098ddd69d6SDmitry Monakhov transfer_to[cnt] = dqget(inode->i_sb, chid[cnt], cnt); 17108ddd69d6SDmitry Monakhov } 1711884d179dSJan Kara down_write(&sb_dqopt(inode->i_sb)->dqptr_sem); 1712884d179dSJan Kara if (IS_NOQUOTA(inode)) { /* File without quota accounting? */ 1713884d179dSJan Kara up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); 1714884d179dSJan Kara goto put_all; 1715884d179dSJan Kara } 1716884d179dSJan Kara spin_lock(&dq_data_lock); 1717884d179dSJan Kara cur_space = inode_get_bytes(inode); 1718fd8fbfc1SDmitry Monakhov rsv_space = inode_get_rsv_space(inode); 1719884d179dSJan Kara space = cur_space + rsv_space; 1720884d179dSJan Kara /* Build the transfer_from list and check the limits */ 1721884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1722dd6f3c6dSJan Kara if (!transfer_to[cnt]) 1723884d179dSJan Kara continue; 1724884d179dSJan Kara transfer_from[cnt] = inode->i_dquot[cnt]; 1725efd8f0e6SChristoph Hellwig ret = check_idq(transfer_to[cnt], 1, warntype_to + cnt); 1726efd8f0e6SChristoph Hellwig if (ret) 1727efd8f0e6SChristoph Hellwig goto over_quota; 1728efd8f0e6SChristoph Hellwig ret = check_bdq(transfer_to[cnt], space, 0, warntype_to + cnt); 1729efd8f0e6SChristoph Hellwig if (ret) 1730884d179dSJan Kara goto over_quota; 1731884d179dSJan Kara } 1732884d179dSJan Kara 1733884d179dSJan Kara /* 1734884d179dSJan Kara * Finally perform the needed transfer from transfer_from to transfer_to 1735884d179dSJan Kara */ 1736884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1737884d179dSJan Kara /* 1738884d179dSJan Kara * Skip changes for same uid or gid or for turned off quota-type. 1739884d179dSJan Kara */ 1740dd6f3c6dSJan Kara if (!transfer_to[cnt]) 1741884d179dSJan Kara continue; 1742884d179dSJan Kara 1743884d179dSJan Kara /* Due to IO error we might not have transfer_from[] structure */ 1744884d179dSJan Kara if (transfer_from[cnt]) { 1745884d179dSJan Kara warntype_from_inodes[cnt] = 1746884d179dSJan Kara info_idq_free(transfer_from[cnt], 1); 1747884d179dSJan Kara warntype_from_space[cnt] = 1748884d179dSJan Kara info_bdq_free(transfer_from[cnt], space); 1749884d179dSJan Kara dquot_decr_inodes(transfer_from[cnt], 1); 1750884d179dSJan Kara dquot_decr_space(transfer_from[cnt], cur_space); 1751884d179dSJan Kara dquot_free_reserved_space(transfer_from[cnt], 1752884d179dSJan Kara rsv_space); 1753884d179dSJan Kara } 1754884d179dSJan Kara 1755884d179dSJan Kara dquot_incr_inodes(transfer_to[cnt], 1); 1756884d179dSJan Kara dquot_incr_space(transfer_to[cnt], cur_space); 1757884d179dSJan Kara dquot_resv_space(transfer_to[cnt], rsv_space); 1758884d179dSJan Kara 1759884d179dSJan Kara inode->i_dquot[cnt] = transfer_to[cnt]; 1760884d179dSJan Kara } 1761884d179dSJan Kara spin_unlock(&dq_data_lock); 1762884d179dSJan Kara up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); 1763884d179dSJan Kara 1764dc52dd3aSDmitry Monakhov mark_all_dquot_dirty(transfer_from); 1765dc52dd3aSDmitry Monakhov mark_all_dquot_dirty(transfer_to); 1766884d179dSJan Kara /* The reference we got is transferred to the inode */ 1767dc52dd3aSDmitry Monakhov for (cnt = 0; cnt < MAXQUOTAS; cnt++) 1768dd6f3c6dSJan Kara transfer_to[cnt] = NULL; 1769884d179dSJan Kara warn_put_all: 1770884d179dSJan Kara flush_warnings(transfer_to, warntype_to); 1771884d179dSJan Kara flush_warnings(transfer_from, warntype_from_inodes); 1772884d179dSJan Kara flush_warnings(transfer_from, warntype_from_space); 1773884d179dSJan Kara put_all: 1774dc52dd3aSDmitry Monakhov dqput_all(transfer_from); 1775dc52dd3aSDmitry Monakhov dqput_all(transfer_to); 1776884d179dSJan Kara return ret; 1777884d179dSJan Kara over_quota: 1778884d179dSJan Kara spin_unlock(&dq_data_lock); 1779884d179dSJan Kara up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); 1780884d179dSJan Kara /* Clear dquot pointers we don't want to dqput() */ 1781884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 1782dd6f3c6dSJan Kara transfer_from[cnt] = NULL; 1783884d179dSJan Kara goto warn_put_all; 1784884d179dSJan Kara } 1785884d179dSJan Kara 17868ddd69d6SDmitry Monakhov /* Wrapper for transferring ownership of an inode for uid/gid only 17878ddd69d6SDmitry Monakhov * Called from FSXXX_setattr() 17888ddd69d6SDmitry Monakhov */ 1789b43fa828SChristoph Hellwig int dquot_transfer(struct inode *inode, struct iattr *iattr) 1790884d179dSJan Kara { 17918ddd69d6SDmitry Monakhov qid_t chid[MAXQUOTAS]; 17928ddd69d6SDmitry Monakhov unsigned long mask = 0; 17938ddd69d6SDmitry Monakhov 17948ddd69d6SDmitry Monakhov if (iattr->ia_valid & ATTR_UID && iattr->ia_uid != inode->i_uid) { 17958ddd69d6SDmitry Monakhov mask |= 1 << USRQUOTA; 17968ddd69d6SDmitry Monakhov chid[USRQUOTA] = iattr->ia_uid; 17978ddd69d6SDmitry Monakhov } 17988ddd69d6SDmitry Monakhov if (iattr->ia_valid & ATTR_GID && iattr->ia_gid != inode->i_gid) { 17998ddd69d6SDmitry Monakhov mask |= 1 << GRPQUOTA; 18008ddd69d6SDmitry Monakhov chid[GRPQUOTA] = iattr->ia_gid; 18018ddd69d6SDmitry Monakhov } 1802884d179dSJan Kara if (sb_any_quota_active(inode->i_sb) && !IS_NOQUOTA(inode)) { 1803871a2931SChristoph Hellwig dquot_initialize(inode); 1804efd8f0e6SChristoph Hellwig return __dquot_transfer(inode, chid, mask); 1805884d179dSJan Kara } 1806884d179dSJan Kara return 0; 1807884d179dSJan Kara } 1808b43fa828SChristoph Hellwig EXPORT_SYMBOL(dquot_transfer); 1809884d179dSJan Kara 1810884d179dSJan Kara /* 1811884d179dSJan Kara * Write info of quota file to disk 1812884d179dSJan Kara */ 1813884d179dSJan Kara int dquot_commit_info(struct super_block *sb, int type) 1814884d179dSJan Kara { 1815884d179dSJan Kara int ret; 1816884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 1817884d179dSJan Kara 1818884d179dSJan Kara mutex_lock(&dqopt->dqio_mutex); 1819884d179dSJan Kara ret = dqopt->ops[type]->write_file_info(sb, type); 1820884d179dSJan Kara mutex_unlock(&dqopt->dqio_mutex); 1821884d179dSJan Kara return ret; 1822884d179dSJan Kara } 1823884d179dSJan Kara EXPORT_SYMBOL(dquot_commit_info); 1824884d179dSJan Kara 1825884d179dSJan Kara /* 1826884d179dSJan Kara * Definitions of diskquota operations. 1827884d179dSJan Kara */ 182861e225dcSAlexey Dobriyan const struct dquot_operations dquot_operations = { 1829884d179dSJan Kara .write_dquot = dquot_commit, 1830884d179dSJan Kara .acquire_dquot = dquot_acquire, 1831884d179dSJan Kara .release_dquot = dquot_release, 1832884d179dSJan Kara .mark_dirty = dquot_mark_dquot_dirty, 1833884d179dSJan Kara .write_info = dquot_commit_info, 1834884d179dSJan Kara .alloc_dquot = dquot_alloc, 1835884d179dSJan Kara .destroy_dquot = dquot_destroy, 1836884d179dSJan Kara }; 1837884d179dSJan Kara 1838884d179dSJan Kara /* 1839907f4554SChristoph Hellwig * Generic helper for ->open on filesystems supporting disk quotas. 1840907f4554SChristoph Hellwig */ 1841907f4554SChristoph Hellwig int dquot_file_open(struct inode *inode, struct file *file) 1842907f4554SChristoph Hellwig { 1843907f4554SChristoph Hellwig int error; 1844907f4554SChristoph Hellwig 1845907f4554SChristoph Hellwig error = generic_file_open(inode, file); 1846907f4554SChristoph Hellwig if (!error && (file->f_mode & FMODE_WRITE)) 1847871a2931SChristoph Hellwig dquot_initialize(inode); 1848907f4554SChristoph Hellwig return error; 1849907f4554SChristoph Hellwig } 1850907f4554SChristoph Hellwig EXPORT_SYMBOL(dquot_file_open); 1851907f4554SChristoph Hellwig 1852907f4554SChristoph Hellwig /* 1853884d179dSJan Kara * Turn quota off on a device. type == -1 ==> quotaoff for all types (umount) 1854884d179dSJan Kara */ 1855884d179dSJan Kara int vfs_quota_disable(struct super_block *sb, int type, unsigned int flags) 1856884d179dSJan Kara { 1857884d179dSJan Kara int cnt, ret = 0; 1858884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 1859884d179dSJan Kara struct inode *toputinode[MAXQUOTAS]; 1860884d179dSJan Kara 1861884d179dSJan Kara /* Cannot turn off usage accounting without turning off limits, or 1862884d179dSJan Kara * suspend quotas and simultaneously turn quotas off. */ 1863884d179dSJan Kara if ((flags & DQUOT_USAGE_ENABLED && !(flags & DQUOT_LIMITS_ENABLED)) 1864884d179dSJan Kara || (flags & DQUOT_SUSPENDED && flags & (DQUOT_LIMITS_ENABLED | 1865884d179dSJan Kara DQUOT_USAGE_ENABLED))) 1866884d179dSJan Kara return -EINVAL; 1867884d179dSJan Kara 1868884d179dSJan Kara /* We need to serialize quota_off() for device */ 1869884d179dSJan Kara mutex_lock(&dqopt->dqonoff_mutex); 1870884d179dSJan Kara 1871884d179dSJan Kara /* 1872884d179dSJan Kara * Skip everything if there's nothing to do. We have to do this because 1873884d179dSJan Kara * sometimes we are called when fill_super() failed and calling 1874884d179dSJan Kara * sync_fs() in such cases does no good. 1875884d179dSJan Kara */ 1876884d179dSJan Kara if (!sb_any_quota_loaded(sb)) { 1877884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 1878884d179dSJan Kara return 0; 1879884d179dSJan Kara } 1880884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1881884d179dSJan Kara toputinode[cnt] = NULL; 1882884d179dSJan Kara if (type != -1 && cnt != type) 1883884d179dSJan Kara continue; 1884884d179dSJan Kara if (!sb_has_quota_loaded(sb, cnt)) 1885884d179dSJan Kara continue; 1886884d179dSJan Kara 1887884d179dSJan Kara if (flags & DQUOT_SUSPENDED) { 1888884d179dSJan Kara spin_lock(&dq_state_lock); 1889884d179dSJan Kara dqopt->flags |= 1890884d179dSJan Kara dquot_state_flag(DQUOT_SUSPENDED, cnt); 1891884d179dSJan Kara spin_unlock(&dq_state_lock); 1892884d179dSJan Kara } else { 1893884d179dSJan Kara spin_lock(&dq_state_lock); 1894884d179dSJan Kara dqopt->flags &= ~dquot_state_flag(flags, cnt); 1895884d179dSJan Kara /* Turning off suspended quotas? */ 1896884d179dSJan Kara if (!sb_has_quota_loaded(sb, cnt) && 1897884d179dSJan Kara sb_has_quota_suspended(sb, cnt)) { 1898884d179dSJan Kara dqopt->flags &= ~dquot_state_flag( 1899884d179dSJan Kara DQUOT_SUSPENDED, cnt); 1900884d179dSJan Kara spin_unlock(&dq_state_lock); 1901884d179dSJan Kara iput(dqopt->files[cnt]); 1902884d179dSJan Kara dqopt->files[cnt] = NULL; 1903884d179dSJan Kara continue; 1904884d179dSJan Kara } 1905884d179dSJan Kara spin_unlock(&dq_state_lock); 1906884d179dSJan Kara } 1907884d179dSJan Kara 1908884d179dSJan Kara /* We still have to keep quota loaded? */ 1909884d179dSJan Kara if (sb_has_quota_loaded(sb, cnt) && !(flags & DQUOT_SUSPENDED)) 1910884d179dSJan Kara continue; 1911884d179dSJan Kara 1912884d179dSJan Kara /* Note: these are blocking operations */ 1913884d179dSJan Kara drop_dquot_ref(sb, cnt); 1914884d179dSJan Kara invalidate_dquots(sb, cnt); 1915884d179dSJan Kara /* 1916268157baSJan Kara * Now all dquots should be invalidated, all writes done so we 1917268157baSJan Kara * should be only users of the info. No locks needed. 1918884d179dSJan Kara */ 1919884d179dSJan Kara if (info_dirty(&dqopt->info[cnt])) 1920884d179dSJan Kara sb->dq_op->write_info(sb, cnt); 1921884d179dSJan Kara if (dqopt->ops[cnt]->free_file_info) 1922884d179dSJan Kara dqopt->ops[cnt]->free_file_info(sb, cnt); 1923884d179dSJan Kara put_quota_format(dqopt->info[cnt].dqi_format); 1924884d179dSJan Kara 1925884d179dSJan Kara toputinode[cnt] = dqopt->files[cnt]; 1926884d179dSJan Kara if (!sb_has_quota_loaded(sb, cnt)) 1927884d179dSJan Kara dqopt->files[cnt] = NULL; 1928884d179dSJan Kara dqopt->info[cnt].dqi_flags = 0; 1929884d179dSJan Kara dqopt->info[cnt].dqi_igrace = 0; 1930884d179dSJan Kara dqopt->info[cnt].dqi_bgrace = 0; 1931884d179dSJan Kara dqopt->ops[cnt] = NULL; 1932884d179dSJan Kara } 1933884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 1934884d179dSJan Kara 1935884d179dSJan Kara /* Skip syncing and setting flags if quota files are hidden */ 1936884d179dSJan Kara if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) 1937884d179dSJan Kara goto put_inodes; 1938884d179dSJan Kara 1939884d179dSJan Kara /* Sync the superblock so that buffers with quota data are written to 1940884d179dSJan Kara * disk (and so userspace sees correct data afterwards). */ 1941884d179dSJan Kara if (sb->s_op->sync_fs) 1942884d179dSJan Kara sb->s_op->sync_fs(sb, 1); 1943884d179dSJan Kara sync_blockdev(sb->s_bdev); 1944884d179dSJan Kara /* Now the quota files are just ordinary files and we can set the 1945884d179dSJan Kara * inode flags back. Moreover we discard the pagecache so that 1946884d179dSJan Kara * userspace sees the writes we did bypassing the pagecache. We 1947884d179dSJan Kara * must also discard the blockdev buffers so that we see the 1948884d179dSJan Kara * changes done by userspace on the next quotaon() */ 1949884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 1950884d179dSJan Kara if (toputinode[cnt]) { 1951884d179dSJan Kara mutex_lock(&dqopt->dqonoff_mutex); 1952884d179dSJan Kara /* If quota was reenabled in the meantime, we have 1953884d179dSJan Kara * nothing to do */ 1954884d179dSJan Kara if (!sb_has_quota_loaded(sb, cnt)) { 1955268157baSJan Kara mutex_lock_nested(&toputinode[cnt]->i_mutex, 1956268157baSJan Kara I_MUTEX_QUOTA); 1957884d179dSJan Kara toputinode[cnt]->i_flags &= ~(S_IMMUTABLE | 1958884d179dSJan Kara S_NOATIME | S_NOQUOTA); 1959268157baSJan Kara truncate_inode_pages(&toputinode[cnt]->i_data, 1960268157baSJan Kara 0); 1961884d179dSJan Kara mutex_unlock(&toputinode[cnt]->i_mutex); 1962884d179dSJan Kara mark_inode_dirty(toputinode[cnt]); 1963884d179dSJan Kara } 1964884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 1965884d179dSJan Kara } 1966884d179dSJan Kara if (sb->s_bdev) 1967884d179dSJan Kara invalidate_bdev(sb->s_bdev); 1968884d179dSJan Kara put_inodes: 1969884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 1970884d179dSJan Kara if (toputinode[cnt]) { 1971884d179dSJan Kara /* On remount RO, we keep the inode pointer so that we 1972884d179dSJan Kara * can reenable quota on the subsequent remount RW. We 1973884d179dSJan Kara * have to check 'flags' variable and not use sb_has_ 1974884d179dSJan Kara * function because another quotaon / quotaoff could 1975884d179dSJan Kara * change global state before we got here. We refuse 1976884d179dSJan Kara * to suspend quotas when there is pending delete on 1977884d179dSJan Kara * the quota file... */ 1978884d179dSJan Kara if (!(flags & DQUOT_SUSPENDED)) 1979884d179dSJan Kara iput(toputinode[cnt]); 1980884d179dSJan Kara else if (!toputinode[cnt]->i_nlink) 1981884d179dSJan Kara ret = -EBUSY; 1982884d179dSJan Kara } 1983884d179dSJan Kara return ret; 1984884d179dSJan Kara } 1985884d179dSJan Kara EXPORT_SYMBOL(vfs_quota_disable); 1986884d179dSJan Kara 1987884d179dSJan Kara int vfs_quota_off(struct super_block *sb, int type, int remount) 1988884d179dSJan Kara { 1989884d179dSJan Kara return vfs_quota_disable(sb, type, remount ? DQUOT_SUSPENDED : 1990884d179dSJan Kara (DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED)); 1991884d179dSJan Kara } 1992884d179dSJan Kara EXPORT_SYMBOL(vfs_quota_off); 1993884d179dSJan Kara /* 1994884d179dSJan Kara * Turn quotas on on a device 1995884d179dSJan Kara */ 1996884d179dSJan Kara 1997884d179dSJan Kara /* 1998884d179dSJan Kara * Helper function to turn quotas on when we already have the inode of 1999884d179dSJan Kara * quota file and no quota information is loaded. 2000884d179dSJan Kara */ 2001884d179dSJan Kara static int vfs_load_quota_inode(struct inode *inode, int type, int format_id, 2002884d179dSJan Kara unsigned int flags) 2003884d179dSJan Kara { 2004884d179dSJan Kara struct quota_format_type *fmt = find_quota_format(format_id); 2005884d179dSJan Kara struct super_block *sb = inode->i_sb; 2006884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 2007884d179dSJan Kara int error; 2008884d179dSJan Kara int oldflags = -1; 2009884d179dSJan Kara 2010884d179dSJan Kara if (!fmt) 2011884d179dSJan Kara return -ESRCH; 2012884d179dSJan Kara if (!S_ISREG(inode->i_mode)) { 2013884d179dSJan Kara error = -EACCES; 2014884d179dSJan Kara goto out_fmt; 2015884d179dSJan Kara } 2016884d179dSJan Kara if (IS_RDONLY(inode)) { 2017884d179dSJan Kara error = -EROFS; 2018884d179dSJan Kara goto out_fmt; 2019884d179dSJan Kara } 2020884d179dSJan Kara if (!sb->s_op->quota_write || !sb->s_op->quota_read) { 2021884d179dSJan Kara error = -EINVAL; 2022884d179dSJan Kara goto out_fmt; 2023884d179dSJan Kara } 2024884d179dSJan Kara /* Usage always has to be set... */ 2025884d179dSJan Kara if (!(flags & DQUOT_USAGE_ENABLED)) { 2026884d179dSJan Kara error = -EINVAL; 2027884d179dSJan Kara goto out_fmt; 2028884d179dSJan Kara } 2029884d179dSJan Kara 2030884d179dSJan Kara if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) { 2031ab94c39bSJan Kara /* As we bypass the pagecache we must now flush all the 2032ab94c39bSJan Kara * dirty data and invalidate caches so that kernel sees 2033ab94c39bSJan Kara * changes from userspace. It is not enough to just flush 2034ab94c39bSJan Kara * the quota file since if blocksize < pagesize, invalidation 2035ab94c39bSJan Kara * of the cache could fail because of other unrelated dirty 2036ab94c39bSJan Kara * data */ 2037ab94c39bSJan Kara sync_filesystem(sb); 2038884d179dSJan Kara invalidate_bdev(sb->s_bdev); 2039884d179dSJan Kara } 2040884d179dSJan Kara mutex_lock(&dqopt->dqonoff_mutex); 2041884d179dSJan Kara if (sb_has_quota_loaded(sb, type)) { 2042884d179dSJan Kara error = -EBUSY; 2043884d179dSJan Kara goto out_lock; 2044884d179dSJan Kara } 2045884d179dSJan Kara 2046884d179dSJan Kara if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) { 2047884d179dSJan Kara /* We don't want quota and atime on quota files (deadlocks 2048884d179dSJan Kara * possible) Also nobody should write to the file - we use 2049884d179dSJan Kara * special IO operations which ignore the immutable bit. */ 2050dee86565SJan Kara mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA); 2051268157baSJan Kara oldflags = inode->i_flags & (S_NOATIME | S_IMMUTABLE | 2052268157baSJan Kara S_NOQUOTA); 2053884d179dSJan Kara inode->i_flags |= S_NOQUOTA | S_NOATIME | S_IMMUTABLE; 2054dee86565SJan Kara mutex_unlock(&inode->i_mutex); 205526245c94SJan Kara /* 205626245c94SJan Kara * When S_NOQUOTA is set, remove dquot references as no more 205726245c94SJan Kara * references can be added 205826245c94SJan Kara */ 20599f754758SChristoph Hellwig __dquot_drop(inode); 2060884d179dSJan Kara } 2061884d179dSJan Kara 2062884d179dSJan Kara error = -EIO; 2063884d179dSJan Kara dqopt->files[type] = igrab(inode); 2064884d179dSJan Kara if (!dqopt->files[type]) 2065884d179dSJan Kara goto out_lock; 2066884d179dSJan Kara error = -EINVAL; 2067884d179dSJan Kara if (!fmt->qf_ops->check_quota_file(sb, type)) 2068884d179dSJan Kara goto out_file_init; 2069884d179dSJan Kara 2070884d179dSJan Kara dqopt->ops[type] = fmt->qf_ops; 2071884d179dSJan Kara dqopt->info[type].dqi_format = fmt; 2072884d179dSJan Kara dqopt->info[type].dqi_fmt_id = format_id; 2073884d179dSJan Kara INIT_LIST_HEAD(&dqopt->info[type].dqi_dirty_list); 2074884d179dSJan Kara mutex_lock(&dqopt->dqio_mutex); 2075268157baSJan Kara error = dqopt->ops[type]->read_file_info(sb, type); 2076268157baSJan Kara if (error < 0) { 2077884d179dSJan Kara mutex_unlock(&dqopt->dqio_mutex); 2078884d179dSJan Kara goto out_file_init; 2079884d179dSJan Kara } 2080884d179dSJan Kara mutex_unlock(&dqopt->dqio_mutex); 2081884d179dSJan Kara spin_lock(&dq_state_lock); 2082884d179dSJan Kara dqopt->flags |= dquot_state_flag(flags, type); 2083884d179dSJan Kara spin_unlock(&dq_state_lock); 2084884d179dSJan Kara 2085884d179dSJan Kara add_dquot_ref(sb, type); 2086884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 2087884d179dSJan Kara 2088884d179dSJan Kara return 0; 2089884d179dSJan Kara 2090884d179dSJan Kara out_file_init: 2091884d179dSJan Kara dqopt->files[type] = NULL; 2092884d179dSJan Kara iput(inode); 2093884d179dSJan Kara out_lock: 2094884d179dSJan Kara if (oldflags != -1) { 2095dee86565SJan Kara mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA); 2096884d179dSJan Kara /* Set the flags back (in the case of accidental quotaon() 2097884d179dSJan Kara * on a wrong file we don't want to mess up the flags) */ 2098884d179dSJan Kara inode->i_flags &= ~(S_NOATIME | S_NOQUOTA | S_IMMUTABLE); 2099884d179dSJan Kara inode->i_flags |= oldflags; 2100dee86565SJan Kara mutex_unlock(&inode->i_mutex); 2101884d179dSJan Kara } 2102d01730d7SJiaying Zhang mutex_unlock(&dqopt->dqonoff_mutex); 2103884d179dSJan Kara out_fmt: 2104884d179dSJan Kara put_quota_format(fmt); 2105884d179dSJan Kara 2106884d179dSJan Kara return error; 2107884d179dSJan Kara } 2108884d179dSJan Kara 2109884d179dSJan Kara /* Reenable quotas on remount RW */ 2110884d179dSJan Kara static int vfs_quota_on_remount(struct super_block *sb, int type) 2111884d179dSJan Kara { 2112884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 2113884d179dSJan Kara struct inode *inode; 2114884d179dSJan Kara int ret; 2115884d179dSJan Kara unsigned int flags; 2116884d179dSJan Kara 2117884d179dSJan Kara mutex_lock(&dqopt->dqonoff_mutex); 2118884d179dSJan Kara if (!sb_has_quota_suspended(sb, type)) { 2119884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 2120884d179dSJan Kara return 0; 2121884d179dSJan Kara } 2122884d179dSJan Kara inode = dqopt->files[type]; 2123884d179dSJan Kara dqopt->files[type] = NULL; 2124884d179dSJan Kara spin_lock(&dq_state_lock); 2125884d179dSJan Kara flags = dqopt->flags & dquot_state_flag(DQUOT_USAGE_ENABLED | 2126884d179dSJan Kara DQUOT_LIMITS_ENABLED, type); 2127884d179dSJan Kara dqopt->flags &= ~dquot_state_flag(DQUOT_STATE_FLAGS, type); 2128884d179dSJan Kara spin_unlock(&dq_state_lock); 2129884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 2130884d179dSJan Kara 2131884d179dSJan Kara flags = dquot_generic_flag(flags, type); 2132884d179dSJan Kara ret = vfs_load_quota_inode(inode, type, dqopt->info[type].dqi_fmt_id, 2133884d179dSJan Kara flags); 2134884d179dSJan Kara iput(inode); 2135884d179dSJan Kara 2136884d179dSJan Kara return ret; 2137884d179dSJan Kara } 2138884d179dSJan Kara 2139884d179dSJan Kara int vfs_quota_on_path(struct super_block *sb, int type, int format_id, 2140884d179dSJan Kara struct path *path) 2141884d179dSJan Kara { 2142884d179dSJan Kara int error = security_quota_on(path->dentry); 2143884d179dSJan Kara if (error) 2144884d179dSJan Kara return error; 2145884d179dSJan Kara /* Quota file not on the same filesystem? */ 2146884d179dSJan Kara if (path->mnt->mnt_sb != sb) 2147884d179dSJan Kara error = -EXDEV; 2148884d179dSJan Kara else 2149884d179dSJan Kara error = vfs_load_quota_inode(path->dentry->d_inode, type, 2150884d179dSJan Kara format_id, DQUOT_USAGE_ENABLED | 2151884d179dSJan Kara DQUOT_LIMITS_ENABLED); 2152884d179dSJan Kara return error; 2153884d179dSJan Kara } 2154884d179dSJan Kara EXPORT_SYMBOL(vfs_quota_on_path); 2155884d179dSJan Kara 2156884d179dSJan Kara int vfs_quota_on(struct super_block *sb, int type, int format_id, char *name, 2157884d179dSJan Kara int remount) 2158884d179dSJan Kara { 2159884d179dSJan Kara struct path path; 2160884d179dSJan Kara int error; 2161884d179dSJan Kara 2162884d179dSJan Kara if (remount) 2163884d179dSJan Kara return vfs_quota_on_remount(sb, type); 2164884d179dSJan Kara 2165884d179dSJan Kara error = kern_path(name, LOOKUP_FOLLOW, &path); 2166884d179dSJan Kara if (!error) { 2167884d179dSJan Kara error = vfs_quota_on_path(sb, type, format_id, &path); 2168884d179dSJan Kara path_put(&path); 2169884d179dSJan Kara } 2170884d179dSJan Kara return error; 2171884d179dSJan Kara } 2172884d179dSJan Kara EXPORT_SYMBOL(vfs_quota_on); 2173884d179dSJan Kara 2174884d179dSJan Kara /* 2175884d179dSJan Kara * More powerful function for turning on quotas allowing setting 2176884d179dSJan Kara * of individual quota flags 2177884d179dSJan Kara */ 2178884d179dSJan Kara int vfs_quota_enable(struct inode *inode, int type, int format_id, 2179884d179dSJan Kara unsigned int flags) 2180884d179dSJan Kara { 2181884d179dSJan Kara int ret = 0; 2182884d179dSJan Kara struct super_block *sb = inode->i_sb; 2183884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 2184884d179dSJan Kara 2185884d179dSJan Kara /* Just unsuspend quotas? */ 2186884d179dSJan Kara if (flags & DQUOT_SUSPENDED) 2187884d179dSJan Kara return vfs_quota_on_remount(sb, type); 2188884d179dSJan Kara if (!flags) 2189884d179dSJan Kara return 0; 2190884d179dSJan Kara /* Just updating flags needed? */ 2191884d179dSJan Kara if (sb_has_quota_loaded(sb, type)) { 2192884d179dSJan Kara mutex_lock(&dqopt->dqonoff_mutex); 2193884d179dSJan Kara /* Now do a reliable test... */ 2194884d179dSJan Kara if (!sb_has_quota_loaded(sb, type)) { 2195884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 2196884d179dSJan Kara goto load_quota; 2197884d179dSJan Kara } 2198884d179dSJan Kara if (flags & DQUOT_USAGE_ENABLED && 2199884d179dSJan Kara sb_has_quota_usage_enabled(sb, type)) { 2200884d179dSJan Kara ret = -EBUSY; 2201884d179dSJan Kara goto out_lock; 2202884d179dSJan Kara } 2203884d179dSJan Kara if (flags & DQUOT_LIMITS_ENABLED && 2204884d179dSJan Kara sb_has_quota_limits_enabled(sb, type)) { 2205884d179dSJan Kara ret = -EBUSY; 2206884d179dSJan Kara goto out_lock; 2207884d179dSJan Kara } 2208884d179dSJan Kara spin_lock(&dq_state_lock); 2209884d179dSJan Kara sb_dqopt(sb)->flags |= dquot_state_flag(flags, type); 2210884d179dSJan Kara spin_unlock(&dq_state_lock); 2211884d179dSJan Kara out_lock: 2212884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 2213884d179dSJan Kara return ret; 2214884d179dSJan Kara } 2215884d179dSJan Kara 2216884d179dSJan Kara load_quota: 2217884d179dSJan Kara return vfs_load_quota_inode(inode, type, format_id, flags); 2218884d179dSJan Kara } 2219884d179dSJan Kara EXPORT_SYMBOL(vfs_quota_enable); 2220884d179dSJan Kara 2221884d179dSJan Kara /* 2222884d179dSJan Kara * This function is used when filesystem needs to initialize quotas 2223884d179dSJan Kara * during mount time. 2224884d179dSJan Kara */ 2225884d179dSJan Kara int vfs_quota_on_mount(struct super_block *sb, char *qf_name, 2226884d179dSJan Kara int format_id, int type) 2227884d179dSJan Kara { 2228884d179dSJan Kara struct dentry *dentry; 2229884d179dSJan Kara int error; 2230884d179dSJan Kara 2231c56818d7SJan Kara mutex_lock(&sb->s_root->d_inode->i_mutex); 2232884d179dSJan Kara dentry = lookup_one_len(qf_name, sb->s_root, strlen(qf_name)); 2233c56818d7SJan Kara mutex_unlock(&sb->s_root->d_inode->i_mutex); 2234884d179dSJan Kara if (IS_ERR(dentry)) 2235884d179dSJan Kara return PTR_ERR(dentry); 2236884d179dSJan Kara 2237884d179dSJan Kara if (!dentry->d_inode) { 2238884d179dSJan Kara error = -ENOENT; 2239884d179dSJan Kara goto out; 2240884d179dSJan Kara } 2241884d179dSJan Kara 2242884d179dSJan Kara error = security_quota_on(dentry); 2243884d179dSJan Kara if (!error) 2244884d179dSJan Kara error = vfs_load_quota_inode(dentry->d_inode, type, format_id, 2245884d179dSJan Kara DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); 2246884d179dSJan Kara 2247884d179dSJan Kara out: 2248884d179dSJan Kara dput(dentry); 2249884d179dSJan Kara return error; 2250884d179dSJan Kara } 2251884d179dSJan Kara EXPORT_SYMBOL(vfs_quota_on_mount); 2252884d179dSJan Kara 2253884d179dSJan Kara /* Wrapper to turn on quotas when remounting rw */ 2254884d179dSJan Kara int vfs_dq_quota_on_remount(struct super_block *sb) 2255884d179dSJan Kara { 2256884d179dSJan Kara int cnt; 2257884d179dSJan Kara int ret = 0, err; 2258884d179dSJan Kara 2259884d179dSJan Kara if (!sb->s_qcop || !sb->s_qcop->quota_on) 2260884d179dSJan Kara return -ENOSYS; 2261884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 2262884d179dSJan Kara err = sb->s_qcop->quota_on(sb, cnt, 0, NULL, 1); 2263884d179dSJan Kara if (err < 0 && !ret) 2264884d179dSJan Kara ret = err; 2265884d179dSJan Kara } 2266884d179dSJan Kara return ret; 2267884d179dSJan Kara } 2268884d179dSJan Kara EXPORT_SYMBOL(vfs_dq_quota_on_remount); 2269884d179dSJan Kara 2270884d179dSJan Kara static inline qsize_t qbtos(qsize_t blocks) 2271884d179dSJan Kara { 2272884d179dSJan Kara return blocks << QIF_DQBLKSIZE_BITS; 2273884d179dSJan Kara } 2274884d179dSJan Kara 2275884d179dSJan Kara static inline qsize_t stoqb(qsize_t space) 2276884d179dSJan Kara { 2277884d179dSJan Kara return (space + QIF_DQBLKSIZE - 1) >> QIF_DQBLKSIZE_BITS; 2278884d179dSJan Kara } 2279884d179dSJan Kara 2280884d179dSJan Kara /* Generic routine for getting common part of quota structure */ 2281884d179dSJan Kara static void do_get_dqblk(struct dquot *dquot, struct if_dqblk *di) 2282884d179dSJan Kara { 2283884d179dSJan Kara struct mem_dqblk *dm = &dquot->dq_dqb; 2284884d179dSJan Kara 2285884d179dSJan Kara spin_lock(&dq_data_lock); 2286884d179dSJan Kara di->dqb_bhardlimit = stoqb(dm->dqb_bhardlimit); 2287884d179dSJan Kara di->dqb_bsoftlimit = stoqb(dm->dqb_bsoftlimit); 2288884d179dSJan Kara di->dqb_curspace = dm->dqb_curspace + dm->dqb_rsvspace; 2289884d179dSJan Kara di->dqb_ihardlimit = dm->dqb_ihardlimit; 2290884d179dSJan Kara di->dqb_isoftlimit = dm->dqb_isoftlimit; 2291884d179dSJan Kara di->dqb_curinodes = dm->dqb_curinodes; 2292884d179dSJan Kara di->dqb_btime = dm->dqb_btime; 2293884d179dSJan Kara di->dqb_itime = dm->dqb_itime; 2294884d179dSJan Kara di->dqb_valid = QIF_ALL; 2295884d179dSJan Kara spin_unlock(&dq_data_lock); 2296884d179dSJan Kara } 2297884d179dSJan Kara 2298268157baSJan Kara int vfs_get_dqblk(struct super_block *sb, int type, qid_t id, 2299268157baSJan Kara struct if_dqblk *di) 2300884d179dSJan Kara { 2301884d179dSJan Kara struct dquot *dquot; 2302884d179dSJan Kara 2303884d179dSJan Kara dquot = dqget(sb, id, type); 2304dd6f3c6dSJan Kara if (!dquot) 2305884d179dSJan Kara return -ESRCH; 2306884d179dSJan Kara do_get_dqblk(dquot, di); 2307884d179dSJan Kara dqput(dquot); 2308884d179dSJan Kara 2309884d179dSJan Kara return 0; 2310884d179dSJan Kara } 2311884d179dSJan Kara EXPORT_SYMBOL(vfs_get_dqblk); 2312884d179dSJan Kara 2313884d179dSJan Kara /* Generic routine for setting common part of quota structure */ 2314884d179dSJan Kara static int do_set_dqblk(struct dquot *dquot, struct if_dqblk *di) 2315884d179dSJan Kara { 2316884d179dSJan Kara struct mem_dqblk *dm = &dquot->dq_dqb; 2317884d179dSJan Kara int check_blim = 0, check_ilim = 0; 2318884d179dSJan Kara struct mem_dqinfo *dqi = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_type]; 2319884d179dSJan Kara 2320884d179dSJan Kara if ((di->dqb_valid & QIF_BLIMITS && 2321884d179dSJan Kara (di->dqb_bhardlimit > dqi->dqi_maxblimit || 2322884d179dSJan Kara di->dqb_bsoftlimit > dqi->dqi_maxblimit)) || 2323884d179dSJan Kara (di->dqb_valid & QIF_ILIMITS && 2324884d179dSJan Kara (di->dqb_ihardlimit > dqi->dqi_maxilimit || 2325884d179dSJan Kara di->dqb_isoftlimit > dqi->dqi_maxilimit))) 2326884d179dSJan Kara return -ERANGE; 2327884d179dSJan Kara 2328884d179dSJan Kara spin_lock(&dq_data_lock); 2329884d179dSJan Kara if (di->dqb_valid & QIF_SPACE) { 2330884d179dSJan Kara dm->dqb_curspace = di->dqb_curspace - dm->dqb_rsvspace; 2331884d179dSJan Kara check_blim = 1; 233208261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags); 2333884d179dSJan Kara } 2334884d179dSJan Kara if (di->dqb_valid & QIF_BLIMITS) { 2335884d179dSJan Kara dm->dqb_bsoftlimit = qbtos(di->dqb_bsoftlimit); 2336884d179dSJan Kara dm->dqb_bhardlimit = qbtos(di->dqb_bhardlimit); 2337884d179dSJan Kara check_blim = 1; 233808261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags); 2339884d179dSJan Kara } 2340884d179dSJan Kara if (di->dqb_valid & QIF_INODES) { 2341884d179dSJan Kara dm->dqb_curinodes = di->dqb_curinodes; 2342884d179dSJan Kara check_ilim = 1; 234308261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags); 2344884d179dSJan Kara } 2345884d179dSJan Kara if (di->dqb_valid & QIF_ILIMITS) { 2346884d179dSJan Kara dm->dqb_isoftlimit = di->dqb_isoftlimit; 2347884d179dSJan Kara dm->dqb_ihardlimit = di->dqb_ihardlimit; 2348884d179dSJan Kara check_ilim = 1; 234908261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags); 2350884d179dSJan Kara } 2351884d179dSJan Kara if (di->dqb_valid & QIF_BTIME) { 2352884d179dSJan Kara dm->dqb_btime = di->dqb_btime; 2353884d179dSJan Kara check_blim = 1; 235408261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags); 2355884d179dSJan Kara } 2356884d179dSJan Kara if (di->dqb_valid & QIF_ITIME) { 2357884d179dSJan Kara dm->dqb_itime = di->dqb_itime; 2358884d179dSJan Kara check_ilim = 1; 235908261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags); 2360884d179dSJan Kara } 2361884d179dSJan Kara 2362884d179dSJan Kara if (check_blim) { 2363268157baSJan Kara if (!dm->dqb_bsoftlimit || 2364268157baSJan Kara dm->dqb_curspace < dm->dqb_bsoftlimit) { 2365884d179dSJan Kara dm->dqb_btime = 0; 2366884d179dSJan Kara clear_bit(DQ_BLKS_B, &dquot->dq_flags); 2367268157baSJan Kara } else if (!(di->dqb_valid & QIF_BTIME)) 2368268157baSJan Kara /* Set grace only if user hasn't provided his own... */ 2369884d179dSJan Kara dm->dqb_btime = get_seconds() + dqi->dqi_bgrace; 2370884d179dSJan Kara } 2371884d179dSJan Kara if (check_ilim) { 2372268157baSJan Kara if (!dm->dqb_isoftlimit || 2373268157baSJan Kara dm->dqb_curinodes < dm->dqb_isoftlimit) { 2374884d179dSJan Kara dm->dqb_itime = 0; 2375884d179dSJan Kara clear_bit(DQ_INODES_B, &dquot->dq_flags); 2376268157baSJan Kara } else if (!(di->dqb_valid & QIF_ITIME)) 2377268157baSJan Kara /* Set grace only if user hasn't provided his own... */ 2378884d179dSJan Kara dm->dqb_itime = get_seconds() + dqi->dqi_igrace; 2379884d179dSJan Kara } 2380268157baSJan Kara if (dm->dqb_bhardlimit || dm->dqb_bsoftlimit || dm->dqb_ihardlimit || 2381268157baSJan Kara dm->dqb_isoftlimit) 2382884d179dSJan Kara clear_bit(DQ_FAKE_B, &dquot->dq_flags); 2383884d179dSJan Kara else 2384884d179dSJan Kara set_bit(DQ_FAKE_B, &dquot->dq_flags); 2385884d179dSJan Kara spin_unlock(&dq_data_lock); 2386884d179dSJan Kara mark_dquot_dirty(dquot); 2387884d179dSJan Kara 2388884d179dSJan Kara return 0; 2389884d179dSJan Kara } 2390884d179dSJan Kara 2391268157baSJan Kara int vfs_set_dqblk(struct super_block *sb, int type, qid_t id, 2392268157baSJan Kara struct if_dqblk *di) 2393884d179dSJan Kara { 2394884d179dSJan Kara struct dquot *dquot; 2395884d179dSJan Kara int rc; 2396884d179dSJan Kara 2397884d179dSJan Kara dquot = dqget(sb, id, type); 2398884d179dSJan Kara if (!dquot) { 2399884d179dSJan Kara rc = -ESRCH; 2400884d179dSJan Kara goto out; 2401884d179dSJan Kara } 2402884d179dSJan Kara rc = do_set_dqblk(dquot, di); 2403884d179dSJan Kara dqput(dquot); 2404884d179dSJan Kara out: 2405884d179dSJan Kara return rc; 2406884d179dSJan Kara } 2407884d179dSJan Kara EXPORT_SYMBOL(vfs_set_dqblk); 2408884d179dSJan Kara 2409884d179dSJan Kara /* Generic routine for getting common part of quota file information */ 2410884d179dSJan Kara int vfs_get_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii) 2411884d179dSJan Kara { 2412884d179dSJan Kara struct mem_dqinfo *mi; 2413884d179dSJan Kara 2414884d179dSJan Kara mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); 2415884d179dSJan Kara if (!sb_has_quota_active(sb, type)) { 2416884d179dSJan Kara mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); 2417884d179dSJan Kara return -ESRCH; 2418884d179dSJan Kara } 2419884d179dSJan Kara mi = sb_dqopt(sb)->info + type; 2420884d179dSJan Kara spin_lock(&dq_data_lock); 2421884d179dSJan Kara ii->dqi_bgrace = mi->dqi_bgrace; 2422884d179dSJan Kara ii->dqi_igrace = mi->dqi_igrace; 2423884d179dSJan Kara ii->dqi_flags = mi->dqi_flags & DQF_MASK; 2424884d179dSJan Kara ii->dqi_valid = IIF_ALL; 2425884d179dSJan Kara spin_unlock(&dq_data_lock); 2426884d179dSJan Kara mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); 2427884d179dSJan Kara return 0; 2428884d179dSJan Kara } 2429884d179dSJan Kara EXPORT_SYMBOL(vfs_get_dqinfo); 2430884d179dSJan Kara 2431884d179dSJan Kara /* Generic routine for setting common part of quota file information */ 2432884d179dSJan Kara int vfs_set_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii) 2433884d179dSJan Kara { 2434884d179dSJan Kara struct mem_dqinfo *mi; 2435884d179dSJan Kara int err = 0; 2436884d179dSJan Kara 2437884d179dSJan Kara mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); 2438884d179dSJan Kara if (!sb_has_quota_active(sb, type)) { 2439884d179dSJan Kara err = -ESRCH; 2440884d179dSJan Kara goto out; 2441884d179dSJan Kara } 2442884d179dSJan Kara mi = sb_dqopt(sb)->info + type; 2443884d179dSJan Kara spin_lock(&dq_data_lock); 2444884d179dSJan Kara if (ii->dqi_valid & IIF_BGRACE) 2445884d179dSJan Kara mi->dqi_bgrace = ii->dqi_bgrace; 2446884d179dSJan Kara if (ii->dqi_valid & IIF_IGRACE) 2447884d179dSJan Kara mi->dqi_igrace = ii->dqi_igrace; 2448884d179dSJan Kara if (ii->dqi_valid & IIF_FLAGS) 2449268157baSJan Kara mi->dqi_flags = (mi->dqi_flags & ~DQF_MASK) | 2450268157baSJan Kara (ii->dqi_flags & DQF_MASK); 2451884d179dSJan Kara spin_unlock(&dq_data_lock); 2452884d179dSJan Kara mark_info_dirty(sb, type); 2453884d179dSJan Kara /* Force write to disk */ 2454884d179dSJan Kara sb->dq_op->write_info(sb, type); 2455884d179dSJan Kara out: 2456884d179dSJan Kara mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); 2457884d179dSJan Kara return err; 2458884d179dSJan Kara } 2459884d179dSJan Kara EXPORT_SYMBOL(vfs_set_dqinfo); 2460884d179dSJan Kara 24610d54b217SAlexey Dobriyan const struct quotactl_ops vfs_quotactl_ops = { 2462884d179dSJan Kara .quota_on = vfs_quota_on, 2463884d179dSJan Kara .quota_off = vfs_quota_off, 2464884d179dSJan Kara .quota_sync = vfs_quota_sync, 2465884d179dSJan Kara .get_info = vfs_get_dqinfo, 2466884d179dSJan Kara .set_info = vfs_set_dqinfo, 2467884d179dSJan Kara .get_dqblk = vfs_get_dqblk, 2468884d179dSJan Kara .set_dqblk = vfs_set_dqblk 2469884d179dSJan Kara }; 2470884d179dSJan Kara 2471884d179dSJan Kara static ctl_table fs_dqstats_table[] = { 2472884d179dSJan Kara { 2473884d179dSJan Kara .procname = "lookups", 2474884d179dSJan Kara .data = &dqstats.lookups, 2475884d179dSJan Kara .maxlen = sizeof(int), 2476884d179dSJan Kara .mode = 0444, 24776d456111SEric W. Biederman .proc_handler = proc_dointvec, 2478884d179dSJan Kara }, 2479884d179dSJan Kara { 2480884d179dSJan Kara .procname = "drops", 2481884d179dSJan Kara .data = &dqstats.drops, 2482884d179dSJan Kara .maxlen = sizeof(int), 2483884d179dSJan Kara .mode = 0444, 24846d456111SEric W. Biederman .proc_handler = proc_dointvec, 2485884d179dSJan Kara }, 2486884d179dSJan Kara { 2487884d179dSJan Kara .procname = "reads", 2488884d179dSJan Kara .data = &dqstats.reads, 2489884d179dSJan Kara .maxlen = sizeof(int), 2490884d179dSJan Kara .mode = 0444, 24916d456111SEric W. Biederman .proc_handler = proc_dointvec, 2492884d179dSJan Kara }, 2493884d179dSJan Kara { 2494884d179dSJan Kara .procname = "writes", 2495884d179dSJan Kara .data = &dqstats.writes, 2496884d179dSJan Kara .maxlen = sizeof(int), 2497884d179dSJan Kara .mode = 0444, 24986d456111SEric W. Biederman .proc_handler = proc_dointvec, 2499884d179dSJan Kara }, 2500884d179dSJan Kara { 2501884d179dSJan Kara .procname = "cache_hits", 2502884d179dSJan Kara .data = &dqstats.cache_hits, 2503884d179dSJan Kara .maxlen = sizeof(int), 2504884d179dSJan Kara .mode = 0444, 25056d456111SEric W. Biederman .proc_handler = proc_dointvec, 2506884d179dSJan Kara }, 2507884d179dSJan Kara { 2508884d179dSJan Kara .procname = "allocated_dquots", 2509884d179dSJan Kara .data = &dqstats.allocated_dquots, 2510884d179dSJan Kara .maxlen = sizeof(int), 2511884d179dSJan Kara .mode = 0444, 25126d456111SEric W. Biederman .proc_handler = proc_dointvec, 2513884d179dSJan Kara }, 2514884d179dSJan Kara { 2515884d179dSJan Kara .procname = "free_dquots", 2516884d179dSJan Kara .data = &dqstats.free_dquots, 2517884d179dSJan Kara .maxlen = sizeof(int), 2518884d179dSJan Kara .mode = 0444, 25196d456111SEric W. Biederman .proc_handler = proc_dointvec, 2520884d179dSJan Kara }, 2521884d179dSJan Kara { 2522884d179dSJan Kara .procname = "syncs", 2523884d179dSJan Kara .data = &dqstats.syncs, 2524884d179dSJan Kara .maxlen = sizeof(int), 2525884d179dSJan Kara .mode = 0444, 25266d456111SEric W. Biederman .proc_handler = proc_dointvec, 2527884d179dSJan Kara }, 2528884d179dSJan Kara #ifdef CONFIG_PRINT_QUOTA_WARNING 2529884d179dSJan Kara { 2530884d179dSJan Kara .procname = "warnings", 2531884d179dSJan Kara .data = &flag_print_warnings, 2532884d179dSJan Kara .maxlen = sizeof(int), 2533884d179dSJan Kara .mode = 0644, 25346d456111SEric W. Biederman .proc_handler = proc_dointvec, 2535884d179dSJan Kara }, 2536884d179dSJan Kara #endif 2537ab09203eSEric W. Biederman { }, 2538884d179dSJan Kara }; 2539884d179dSJan Kara 2540884d179dSJan Kara static ctl_table fs_table[] = { 2541884d179dSJan Kara { 2542884d179dSJan Kara .procname = "quota", 2543884d179dSJan Kara .mode = 0555, 2544884d179dSJan Kara .child = fs_dqstats_table, 2545884d179dSJan Kara }, 2546ab09203eSEric W. Biederman { }, 2547884d179dSJan Kara }; 2548884d179dSJan Kara 2549884d179dSJan Kara static ctl_table sys_table[] = { 2550884d179dSJan Kara { 2551884d179dSJan Kara .procname = "fs", 2552884d179dSJan Kara .mode = 0555, 2553884d179dSJan Kara .child = fs_table, 2554884d179dSJan Kara }, 2555ab09203eSEric W. Biederman { }, 2556884d179dSJan Kara }; 2557884d179dSJan Kara 2558884d179dSJan Kara static int __init dquot_init(void) 2559884d179dSJan Kara { 2560884d179dSJan Kara int i; 2561884d179dSJan Kara unsigned long nr_hash, order; 2562884d179dSJan Kara 2563884d179dSJan Kara printk(KERN_NOTICE "VFS: Disk quotas %s\n", __DQUOT_VERSION__); 2564884d179dSJan Kara 2565884d179dSJan Kara register_sysctl_table(sys_table); 2566884d179dSJan Kara 2567884d179dSJan Kara dquot_cachep = kmem_cache_create("dquot", 2568884d179dSJan Kara sizeof(struct dquot), sizeof(unsigned long) * 4, 2569884d179dSJan Kara (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| 2570884d179dSJan Kara SLAB_MEM_SPREAD|SLAB_PANIC), 2571884d179dSJan Kara NULL); 2572884d179dSJan Kara 2573884d179dSJan Kara order = 0; 2574884d179dSJan Kara dquot_hash = (struct hlist_head *)__get_free_pages(GFP_ATOMIC, order); 2575884d179dSJan Kara if (!dquot_hash) 2576884d179dSJan Kara panic("Cannot create dquot hash table"); 2577884d179dSJan Kara 2578884d179dSJan Kara /* Find power-of-two hlist_heads which can fit into allocation */ 2579884d179dSJan Kara nr_hash = (1UL << order) * PAGE_SIZE / sizeof(struct hlist_head); 2580884d179dSJan Kara dq_hash_bits = 0; 2581884d179dSJan Kara do { 2582884d179dSJan Kara dq_hash_bits++; 2583884d179dSJan Kara } while (nr_hash >> dq_hash_bits); 2584884d179dSJan Kara dq_hash_bits--; 2585884d179dSJan Kara 2586884d179dSJan Kara nr_hash = 1UL << dq_hash_bits; 2587884d179dSJan Kara dq_hash_mask = nr_hash - 1; 2588884d179dSJan Kara for (i = 0; i < nr_hash; i++) 2589884d179dSJan Kara INIT_HLIST_HEAD(dquot_hash + i); 2590884d179dSJan Kara 2591884d179dSJan Kara printk("Dquot-cache hash table entries: %ld (order %ld, %ld bytes)\n", 2592884d179dSJan Kara nr_hash, order, (PAGE_SIZE << order)); 2593884d179dSJan Kara 2594884d179dSJan Kara register_shrinker(&dqcache_shrinker); 2595884d179dSJan Kara 2596884d179dSJan Kara return 0; 2597884d179dSJan Kara } 2598884d179dSJan Kara module_init(dquot_init); 2599