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 #define __DQUOT_PARANOIA 84884d179dSJan Kara 85884d179dSJan Kara /* 86884d179dSJan Kara * There are three quota SMP locks. dq_list_lock protects all lists with quotas 87884d179dSJan Kara * and quota formats, dqstats structure containing statistics about the lists 88884d179dSJan Kara * dq_data_lock protects data from dq_dqb and also mem_dqinfo structures and 89884d179dSJan Kara * also guards consistency of dquot->dq_dqb with inode->i_blocks, i_bytes. 90884d179dSJan Kara * i_blocks and i_bytes updates itself are guarded by i_lock acquired directly 91884d179dSJan Kara * in inode_add_bytes() and inode_sub_bytes(). dq_state_lock protects 92884d179dSJan Kara * modifications of quota state (on quotaon and quotaoff) and readers who care 93884d179dSJan Kara * about latest values take it as well. 94884d179dSJan Kara * 95884d179dSJan Kara * The spinlock ordering is hence: dq_data_lock > dq_list_lock > i_lock, 96884d179dSJan Kara * dq_list_lock > dq_state_lock 97884d179dSJan Kara * 98884d179dSJan Kara * Note that some things (eg. sb pointer, type, id) doesn't change during 99884d179dSJan Kara * the life of the dquot structure and so needn't to be protected by a lock 100884d179dSJan Kara * 101884d179dSJan Kara * Any operation working on dquots via inode pointers must hold dqptr_sem. If 102884d179dSJan Kara * operation is just reading pointers from inode (or not using them at all) the 10326245c94SJan Kara * read lock is enough. If pointers are altered function must hold write lock. 10426245c94SJan Kara * Special care needs to be taken about S_NOQUOTA inode flag (marking that 10526245c94SJan Kara * inode is a quota file). Functions adding pointers from inode to dquots have 10626245c94SJan Kara * to check this flag under dqptr_sem and then (if S_NOQUOTA is not set) they 10726245c94SJan Kara * have to do all pointer modifications before dropping dqptr_sem. This makes 10826245c94SJan Kara * sure they cannot race with quotaon which first sets S_NOQUOTA flag and 10926245c94SJan Kara * then drops all pointers to dquots from an inode. 110884d179dSJan Kara * 111884d179dSJan Kara * Each dquot has its dq_lock mutex. Locked dquots might not be referenced 112884d179dSJan Kara * from inodes (dquot_alloc_space() and such don't check the dq_lock). 113884d179dSJan Kara * Currently dquot is locked only when it is being read to memory (or space for 114884d179dSJan Kara * it is being allocated) on the first dqget() and when it is being released on 115884d179dSJan Kara * the last dqput(). The allocation and release oparations are serialized by 116884d179dSJan Kara * the dq_lock and by checking the use count in dquot_release(). Write 117884d179dSJan Kara * operations on dquots don't hold dq_lock as they copy data under dq_data_lock 118884d179dSJan Kara * spinlock to internal buffers before writing. 119884d179dSJan Kara * 120884d179dSJan Kara * Lock ordering (including related VFS locks) is the following: 121884d179dSJan Kara * i_mutex > dqonoff_sem > journal_lock > dqptr_sem > dquot->dq_lock > 122884d179dSJan Kara * dqio_mutex 123884d179dSJan Kara * The lock ordering of dqptr_sem imposed by quota code is only dqonoff_sem > 124884d179dSJan Kara * dqptr_sem. But filesystem has to count with the fact that functions such as 125884d179dSJan Kara * dquot_alloc_space() acquire dqptr_sem and they usually have to be called 126884d179dSJan Kara * from inside a transaction to keep filesystem consistency after a crash. Also 127884d179dSJan Kara * filesystems usually want to do some IO on dquot from ->mark_dirty which is 128884d179dSJan Kara * called with dqptr_sem held. 129884d179dSJan Kara * i_mutex on quota files is special (it's below dqio_mutex) 130884d179dSJan Kara */ 131884d179dSJan Kara 132c516610cSJan Kara static __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_list_lock); 133c516610cSJan Kara static __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_state_lock); 134c516610cSJan Kara __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_data_lock); 135884d179dSJan Kara EXPORT_SYMBOL(dq_data_lock); 136884d179dSJan Kara 137884d179dSJan Kara static char *quotatypes[] = INITQFNAMES; 138884d179dSJan Kara static struct quota_format_type *quota_formats; /* List of registered formats */ 139884d179dSJan Kara static struct quota_module_name module_names[] = INIT_QUOTA_MODULE_NAMES; 140884d179dSJan Kara 141884d179dSJan Kara /* SLAB cache for dquot structures */ 142884d179dSJan Kara static struct kmem_cache *dquot_cachep; 143884d179dSJan Kara 144884d179dSJan Kara int register_quota_format(struct quota_format_type *fmt) 145884d179dSJan Kara { 146884d179dSJan Kara spin_lock(&dq_list_lock); 147884d179dSJan Kara fmt->qf_next = quota_formats; 148884d179dSJan Kara quota_formats = fmt; 149884d179dSJan Kara spin_unlock(&dq_list_lock); 150884d179dSJan Kara return 0; 151884d179dSJan Kara } 152884d179dSJan Kara EXPORT_SYMBOL(register_quota_format); 153884d179dSJan Kara 154884d179dSJan Kara void unregister_quota_format(struct quota_format_type *fmt) 155884d179dSJan Kara { 156884d179dSJan Kara struct quota_format_type **actqf; 157884d179dSJan Kara 158884d179dSJan Kara spin_lock(&dq_list_lock); 159268157baSJan Kara for (actqf = "a_formats; *actqf && *actqf != fmt; 160268157baSJan Kara actqf = &(*actqf)->qf_next) 161268157baSJan Kara ; 162884d179dSJan Kara if (*actqf) 163884d179dSJan Kara *actqf = (*actqf)->qf_next; 164884d179dSJan Kara spin_unlock(&dq_list_lock); 165884d179dSJan Kara } 166884d179dSJan Kara EXPORT_SYMBOL(unregister_quota_format); 167884d179dSJan Kara 168884d179dSJan Kara static struct quota_format_type *find_quota_format(int id) 169884d179dSJan Kara { 170884d179dSJan Kara struct quota_format_type *actqf; 171884d179dSJan Kara 172884d179dSJan Kara spin_lock(&dq_list_lock); 173268157baSJan Kara for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id; 174268157baSJan Kara actqf = actqf->qf_next) 175268157baSJan Kara ; 176884d179dSJan Kara if (!actqf || !try_module_get(actqf->qf_owner)) { 177884d179dSJan Kara int qm; 178884d179dSJan Kara 179884d179dSJan Kara spin_unlock(&dq_list_lock); 180884d179dSJan Kara 181268157baSJan Kara for (qm = 0; module_names[qm].qm_fmt_id && 182268157baSJan Kara module_names[qm].qm_fmt_id != id; qm++) 183268157baSJan Kara ; 184268157baSJan Kara if (!module_names[qm].qm_fmt_id || 185268157baSJan Kara request_module(module_names[qm].qm_mod_name)) 186884d179dSJan Kara return NULL; 187884d179dSJan Kara 188884d179dSJan Kara spin_lock(&dq_list_lock); 189268157baSJan Kara for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id; 190268157baSJan Kara actqf = actqf->qf_next) 191268157baSJan Kara ; 192884d179dSJan Kara if (actqf && !try_module_get(actqf->qf_owner)) 193884d179dSJan Kara actqf = NULL; 194884d179dSJan Kara } 195884d179dSJan Kara spin_unlock(&dq_list_lock); 196884d179dSJan Kara return actqf; 197884d179dSJan Kara } 198884d179dSJan Kara 199884d179dSJan Kara static void put_quota_format(struct quota_format_type *fmt) 200884d179dSJan Kara { 201884d179dSJan Kara module_put(fmt->qf_owner); 202884d179dSJan Kara } 203884d179dSJan Kara 204884d179dSJan Kara /* 205884d179dSJan Kara * Dquot List Management: 206884d179dSJan Kara * The quota code uses three lists for dquot management: the inuse_list, 207884d179dSJan Kara * free_dquots, and dquot_hash[] array. A single dquot structure may be 208884d179dSJan Kara * on all three lists, depending on its current state. 209884d179dSJan Kara * 210884d179dSJan Kara * All dquots are placed to the end of inuse_list when first created, and this 211884d179dSJan Kara * list is used for invalidate operation, which must look at every dquot. 212884d179dSJan Kara * 213884d179dSJan Kara * Unused dquots (dq_count == 0) are added to the free_dquots list when freed, 214884d179dSJan Kara * and this list is searched whenever we need an available dquot. Dquots are 215884d179dSJan Kara * removed from the list as soon as they are used again, and 216884d179dSJan Kara * dqstats.free_dquots gives the number of dquots on the list. When 217884d179dSJan Kara * dquot is invalidated it's completely released from memory. 218884d179dSJan Kara * 219884d179dSJan Kara * Dquots with a specific identity (device, type and id) are placed on 220884d179dSJan Kara * one of the dquot_hash[] hash chains. The provides an efficient search 221884d179dSJan Kara * mechanism to locate a specific dquot. 222884d179dSJan Kara */ 223884d179dSJan Kara 224884d179dSJan Kara static LIST_HEAD(inuse_list); 225884d179dSJan Kara static LIST_HEAD(free_dquots); 226884d179dSJan Kara static unsigned int dq_hash_bits, dq_hash_mask; 227884d179dSJan Kara static struct hlist_head *dquot_hash; 228884d179dSJan Kara 229884d179dSJan Kara struct dqstats dqstats; 230884d179dSJan Kara EXPORT_SYMBOL(dqstats); 231884d179dSJan Kara 2320a5a9c72SJan Kara static qsize_t inode_get_rsv_space(struct inode *inode); 2330a5a9c72SJan Kara 234884d179dSJan Kara static inline unsigned int 235884d179dSJan Kara hashfn(const struct super_block *sb, unsigned int id, int type) 236884d179dSJan Kara { 237884d179dSJan Kara unsigned long tmp; 238884d179dSJan Kara 239884d179dSJan Kara tmp = (((unsigned long)sb>>L1_CACHE_SHIFT) ^ id) * (MAXQUOTAS - type); 240884d179dSJan Kara return (tmp + (tmp >> dq_hash_bits)) & dq_hash_mask; 241884d179dSJan Kara } 242884d179dSJan Kara 243884d179dSJan Kara /* 244884d179dSJan Kara * Following list functions expect dq_list_lock to be held 245884d179dSJan Kara */ 246884d179dSJan Kara static inline void insert_dquot_hash(struct dquot *dquot) 247884d179dSJan Kara { 248268157baSJan Kara struct hlist_head *head; 249268157baSJan Kara head = dquot_hash + hashfn(dquot->dq_sb, dquot->dq_id, dquot->dq_type); 250884d179dSJan Kara hlist_add_head(&dquot->dq_hash, head); 251884d179dSJan Kara } 252884d179dSJan Kara 253884d179dSJan Kara static inline void remove_dquot_hash(struct dquot *dquot) 254884d179dSJan Kara { 255884d179dSJan Kara hlist_del_init(&dquot->dq_hash); 256884d179dSJan Kara } 257884d179dSJan Kara 2587a2435d8SJan Kara static struct dquot *find_dquot(unsigned int hashent, struct super_block *sb, 2597a2435d8SJan Kara unsigned int id, int type) 260884d179dSJan Kara { 261884d179dSJan Kara struct hlist_node *node; 262884d179dSJan Kara struct dquot *dquot; 263884d179dSJan Kara 264884d179dSJan Kara hlist_for_each (node, dquot_hash+hashent) { 265884d179dSJan Kara dquot = hlist_entry(node, struct dquot, dq_hash); 266268157baSJan Kara if (dquot->dq_sb == sb && dquot->dq_id == id && 267268157baSJan Kara dquot->dq_type == type) 268884d179dSJan Kara return dquot; 269884d179dSJan Kara } 270dd6f3c6dSJan Kara return NULL; 271884d179dSJan Kara } 272884d179dSJan Kara 273884d179dSJan Kara /* Add a dquot to the tail of the free list */ 274884d179dSJan Kara static inline void put_dquot_last(struct dquot *dquot) 275884d179dSJan Kara { 276884d179dSJan Kara list_add_tail(&dquot->dq_free, &free_dquots); 277884d179dSJan Kara dqstats.free_dquots++; 278884d179dSJan Kara } 279884d179dSJan Kara 280884d179dSJan Kara static inline void remove_free_dquot(struct dquot *dquot) 281884d179dSJan Kara { 282884d179dSJan Kara if (list_empty(&dquot->dq_free)) 283884d179dSJan Kara return; 284884d179dSJan Kara list_del_init(&dquot->dq_free); 285884d179dSJan Kara dqstats.free_dquots--; 286884d179dSJan Kara } 287884d179dSJan Kara 288884d179dSJan Kara static inline void put_inuse(struct dquot *dquot) 289884d179dSJan Kara { 290884d179dSJan Kara /* We add to the back of inuse list so we don't have to restart 291884d179dSJan Kara * when traversing this list and we block */ 292884d179dSJan Kara list_add_tail(&dquot->dq_inuse, &inuse_list); 293884d179dSJan Kara dqstats.allocated_dquots++; 294884d179dSJan Kara } 295884d179dSJan Kara 296884d179dSJan Kara static inline void remove_inuse(struct dquot *dquot) 297884d179dSJan Kara { 298884d179dSJan Kara dqstats.allocated_dquots--; 299884d179dSJan Kara list_del(&dquot->dq_inuse); 300884d179dSJan Kara } 301884d179dSJan Kara /* 302884d179dSJan Kara * End of list functions needing dq_list_lock 303884d179dSJan Kara */ 304884d179dSJan Kara 305884d179dSJan Kara static void wait_on_dquot(struct dquot *dquot) 306884d179dSJan Kara { 307884d179dSJan Kara mutex_lock(&dquot->dq_lock); 308884d179dSJan Kara mutex_unlock(&dquot->dq_lock); 309884d179dSJan Kara } 310884d179dSJan Kara 311884d179dSJan Kara static inline int dquot_dirty(struct dquot *dquot) 312884d179dSJan Kara { 313884d179dSJan Kara return test_bit(DQ_MOD_B, &dquot->dq_flags); 314884d179dSJan Kara } 315884d179dSJan Kara 316884d179dSJan Kara static inline int mark_dquot_dirty(struct dquot *dquot) 317884d179dSJan Kara { 318884d179dSJan Kara return dquot->dq_sb->dq_op->mark_dirty(dquot); 319884d179dSJan Kara } 320884d179dSJan Kara 321884d179dSJan Kara int dquot_mark_dquot_dirty(struct dquot *dquot) 322884d179dSJan Kara { 323884d179dSJan Kara spin_lock(&dq_list_lock); 324884d179dSJan Kara if (!test_and_set_bit(DQ_MOD_B, &dquot->dq_flags)) 325884d179dSJan Kara list_add(&dquot->dq_dirty, &sb_dqopt(dquot->dq_sb)-> 326884d179dSJan Kara info[dquot->dq_type].dqi_dirty_list); 327884d179dSJan Kara spin_unlock(&dq_list_lock); 328884d179dSJan Kara return 0; 329884d179dSJan Kara } 330884d179dSJan Kara EXPORT_SYMBOL(dquot_mark_dquot_dirty); 331884d179dSJan Kara 332dc52dd3aSDmitry Monakhov /* Dirtify all the dquots - this can block when journalling */ 333dc52dd3aSDmitry Monakhov static inline int mark_all_dquot_dirty(struct dquot * const *dquot) 334dc52dd3aSDmitry Monakhov { 335dc52dd3aSDmitry Monakhov int ret, err, cnt; 336dc52dd3aSDmitry Monakhov 337dc52dd3aSDmitry Monakhov ret = err = 0; 338dc52dd3aSDmitry Monakhov for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 339dc52dd3aSDmitry Monakhov if (dquot[cnt]) 340dc52dd3aSDmitry Monakhov /* Even in case of error we have to continue */ 341dc52dd3aSDmitry Monakhov ret = mark_dquot_dirty(dquot[cnt]); 342dc52dd3aSDmitry Monakhov if (!err) 343dc52dd3aSDmitry Monakhov err = ret; 344dc52dd3aSDmitry Monakhov } 345dc52dd3aSDmitry Monakhov return err; 346dc52dd3aSDmitry Monakhov } 347dc52dd3aSDmitry Monakhov 348dc52dd3aSDmitry Monakhov static inline void dqput_all(struct dquot **dquot) 349dc52dd3aSDmitry Monakhov { 350dc52dd3aSDmitry Monakhov unsigned int cnt; 351dc52dd3aSDmitry Monakhov 352dc52dd3aSDmitry Monakhov for (cnt = 0; cnt < MAXQUOTAS; cnt++) 353dc52dd3aSDmitry Monakhov dqput(dquot[cnt]); 354dc52dd3aSDmitry Monakhov } 355dc52dd3aSDmitry Monakhov 356884d179dSJan Kara /* This function needs dq_list_lock */ 357884d179dSJan Kara static inline int clear_dquot_dirty(struct dquot *dquot) 358884d179dSJan Kara { 359884d179dSJan Kara if (!test_and_clear_bit(DQ_MOD_B, &dquot->dq_flags)) 360884d179dSJan Kara return 0; 361884d179dSJan Kara list_del_init(&dquot->dq_dirty); 362884d179dSJan Kara return 1; 363884d179dSJan Kara } 364884d179dSJan Kara 365884d179dSJan Kara void mark_info_dirty(struct super_block *sb, int type) 366884d179dSJan Kara { 367884d179dSJan Kara set_bit(DQF_INFO_DIRTY_B, &sb_dqopt(sb)->info[type].dqi_flags); 368884d179dSJan Kara } 369884d179dSJan Kara EXPORT_SYMBOL(mark_info_dirty); 370884d179dSJan Kara 371884d179dSJan Kara /* 372884d179dSJan Kara * Read dquot from disk and alloc space for it 373884d179dSJan Kara */ 374884d179dSJan Kara 375884d179dSJan Kara int dquot_acquire(struct dquot *dquot) 376884d179dSJan Kara { 377884d179dSJan Kara int ret = 0, ret2 = 0; 378884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); 379884d179dSJan Kara 380884d179dSJan Kara mutex_lock(&dquot->dq_lock); 381884d179dSJan Kara mutex_lock(&dqopt->dqio_mutex); 382884d179dSJan Kara if (!test_bit(DQ_READ_B, &dquot->dq_flags)) 383884d179dSJan Kara ret = dqopt->ops[dquot->dq_type]->read_dqblk(dquot); 384884d179dSJan Kara if (ret < 0) 385884d179dSJan Kara goto out_iolock; 386884d179dSJan Kara set_bit(DQ_READ_B, &dquot->dq_flags); 387884d179dSJan Kara /* Instantiate dquot if needed */ 388884d179dSJan Kara if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && !dquot->dq_off) { 389884d179dSJan Kara ret = dqopt->ops[dquot->dq_type]->commit_dqblk(dquot); 390884d179dSJan Kara /* Write the info if needed */ 391268157baSJan Kara if (info_dirty(&dqopt->info[dquot->dq_type])) { 392268157baSJan Kara ret2 = dqopt->ops[dquot->dq_type]->write_file_info( 393268157baSJan Kara dquot->dq_sb, dquot->dq_type); 394268157baSJan Kara } 395884d179dSJan Kara if (ret < 0) 396884d179dSJan Kara goto out_iolock; 397884d179dSJan Kara if (ret2 < 0) { 398884d179dSJan Kara ret = ret2; 399884d179dSJan Kara goto out_iolock; 400884d179dSJan Kara } 401884d179dSJan Kara } 402884d179dSJan Kara set_bit(DQ_ACTIVE_B, &dquot->dq_flags); 403884d179dSJan Kara out_iolock: 404884d179dSJan Kara mutex_unlock(&dqopt->dqio_mutex); 405884d179dSJan Kara mutex_unlock(&dquot->dq_lock); 406884d179dSJan Kara return ret; 407884d179dSJan Kara } 408884d179dSJan Kara EXPORT_SYMBOL(dquot_acquire); 409884d179dSJan Kara 410884d179dSJan Kara /* 411884d179dSJan Kara * Write dquot to disk 412884d179dSJan Kara */ 413884d179dSJan Kara int dquot_commit(struct dquot *dquot) 414884d179dSJan Kara { 415884d179dSJan Kara int ret = 0, ret2 = 0; 416884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); 417884d179dSJan Kara 418884d179dSJan Kara mutex_lock(&dqopt->dqio_mutex); 419884d179dSJan Kara spin_lock(&dq_list_lock); 420884d179dSJan Kara if (!clear_dquot_dirty(dquot)) { 421884d179dSJan Kara spin_unlock(&dq_list_lock); 422884d179dSJan Kara goto out_sem; 423884d179dSJan Kara } 424884d179dSJan Kara spin_unlock(&dq_list_lock); 425884d179dSJan Kara /* Inactive dquot can be only if there was error during read/init 426884d179dSJan Kara * => we have better not writing it */ 427884d179dSJan Kara if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { 428884d179dSJan Kara ret = dqopt->ops[dquot->dq_type]->commit_dqblk(dquot); 429268157baSJan Kara if (info_dirty(&dqopt->info[dquot->dq_type])) { 430268157baSJan Kara ret2 = dqopt->ops[dquot->dq_type]->write_file_info( 431268157baSJan Kara dquot->dq_sb, dquot->dq_type); 432268157baSJan Kara } 433884d179dSJan Kara if (ret >= 0) 434884d179dSJan Kara ret = ret2; 435884d179dSJan Kara } 436884d179dSJan Kara out_sem: 437884d179dSJan Kara mutex_unlock(&dqopt->dqio_mutex); 438884d179dSJan Kara return ret; 439884d179dSJan Kara } 440884d179dSJan Kara EXPORT_SYMBOL(dquot_commit); 441884d179dSJan Kara 442884d179dSJan Kara /* 443884d179dSJan Kara * Release dquot 444884d179dSJan Kara */ 445884d179dSJan Kara int dquot_release(struct dquot *dquot) 446884d179dSJan Kara { 447884d179dSJan Kara int ret = 0, ret2 = 0; 448884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); 449884d179dSJan Kara 450884d179dSJan Kara mutex_lock(&dquot->dq_lock); 451884d179dSJan Kara /* Check whether we are not racing with some other dqget() */ 452884d179dSJan Kara if (atomic_read(&dquot->dq_count) > 1) 453884d179dSJan Kara goto out_dqlock; 454884d179dSJan Kara mutex_lock(&dqopt->dqio_mutex); 455884d179dSJan Kara if (dqopt->ops[dquot->dq_type]->release_dqblk) { 456884d179dSJan Kara ret = dqopt->ops[dquot->dq_type]->release_dqblk(dquot); 457884d179dSJan Kara /* Write the info */ 458268157baSJan Kara if (info_dirty(&dqopt->info[dquot->dq_type])) { 459268157baSJan Kara ret2 = dqopt->ops[dquot->dq_type]->write_file_info( 460268157baSJan Kara dquot->dq_sb, dquot->dq_type); 461268157baSJan Kara } 462884d179dSJan Kara if (ret >= 0) 463884d179dSJan Kara ret = ret2; 464884d179dSJan Kara } 465884d179dSJan Kara clear_bit(DQ_ACTIVE_B, &dquot->dq_flags); 466884d179dSJan Kara mutex_unlock(&dqopt->dqio_mutex); 467884d179dSJan Kara out_dqlock: 468884d179dSJan Kara mutex_unlock(&dquot->dq_lock); 469884d179dSJan Kara return ret; 470884d179dSJan Kara } 471884d179dSJan Kara EXPORT_SYMBOL(dquot_release); 472884d179dSJan Kara 473884d179dSJan Kara void dquot_destroy(struct dquot *dquot) 474884d179dSJan Kara { 475884d179dSJan Kara kmem_cache_free(dquot_cachep, dquot); 476884d179dSJan Kara } 477884d179dSJan Kara EXPORT_SYMBOL(dquot_destroy); 478884d179dSJan Kara 479884d179dSJan Kara static inline void do_destroy_dquot(struct dquot *dquot) 480884d179dSJan Kara { 481884d179dSJan Kara dquot->dq_sb->dq_op->destroy_dquot(dquot); 482884d179dSJan Kara } 483884d179dSJan Kara 484884d179dSJan Kara /* Invalidate all dquots on the list. Note that this function is called after 485884d179dSJan Kara * quota is disabled and pointers from inodes removed so there cannot be new 486884d179dSJan Kara * quota users. There can still be some users of quotas due to inodes being 487884d179dSJan Kara * just deleted or pruned by prune_icache() (those are not attached to any 488884d179dSJan Kara * list) or parallel quotactl call. We have to wait for such users. 489884d179dSJan Kara */ 490884d179dSJan Kara static void invalidate_dquots(struct super_block *sb, int type) 491884d179dSJan Kara { 492884d179dSJan Kara struct dquot *dquot, *tmp; 493884d179dSJan Kara 494884d179dSJan Kara restart: 495884d179dSJan Kara spin_lock(&dq_list_lock); 496884d179dSJan Kara list_for_each_entry_safe(dquot, tmp, &inuse_list, dq_inuse) { 497884d179dSJan Kara if (dquot->dq_sb != sb) 498884d179dSJan Kara continue; 499884d179dSJan Kara if (dquot->dq_type != type) 500884d179dSJan Kara continue; 501884d179dSJan Kara /* Wait for dquot users */ 502884d179dSJan Kara if (atomic_read(&dquot->dq_count)) { 503884d179dSJan Kara DEFINE_WAIT(wait); 504884d179dSJan Kara 505884d179dSJan Kara atomic_inc(&dquot->dq_count); 506884d179dSJan Kara prepare_to_wait(&dquot->dq_wait_unused, &wait, 507884d179dSJan Kara TASK_UNINTERRUPTIBLE); 508884d179dSJan Kara spin_unlock(&dq_list_lock); 509884d179dSJan Kara /* Once dqput() wakes us up, we know it's time to free 510884d179dSJan Kara * the dquot. 511884d179dSJan Kara * IMPORTANT: we rely on the fact that there is always 512884d179dSJan Kara * at most one process waiting for dquot to free. 513884d179dSJan Kara * Otherwise dq_count would be > 1 and we would never 514884d179dSJan Kara * wake up. 515884d179dSJan Kara */ 516884d179dSJan Kara if (atomic_read(&dquot->dq_count) > 1) 517884d179dSJan Kara schedule(); 518884d179dSJan Kara finish_wait(&dquot->dq_wait_unused, &wait); 519884d179dSJan Kara dqput(dquot); 520884d179dSJan Kara /* At this moment dquot() need not exist (it could be 521884d179dSJan Kara * reclaimed by prune_dqcache(). Hence we must 522884d179dSJan Kara * restart. */ 523884d179dSJan Kara goto restart; 524884d179dSJan Kara } 525884d179dSJan Kara /* 526884d179dSJan Kara * Quota now has no users and it has been written on last 527884d179dSJan Kara * dqput() 528884d179dSJan Kara */ 529884d179dSJan Kara remove_dquot_hash(dquot); 530884d179dSJan Kara remove_free_dquot(dquot); 531884d179dSJan Kara remove_inuse(dquot); 532884d179dSJan Kara do_destroy_dquot(dquot); 533884d179dSJan Kara } 534884d179dSJan Kara spin_unlock(&dq_list_lock); 535884d179dSJan Kara } 536884d179dSJan Kara 537884d179dSJan Kara /* Call callback for every active dquot on given filesystem */ 538884d179dSJan Kara int dquot_scan_active(struct super_block *sb, 539884d179dSJan Kara int (*fn)(struct dquot *dquot, unsigned long priv), 540884d179dSJan Kara unsigned long priv) 541884d179dSJan Kara { 542884d179dSJan Kara struct dquot *dquot, *old_dquot = NULL; 543884d179dSJan Kara int ret = 0; 544884d179dSJan Kara 545884d179dSJan Kara mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); 546884d179dSJan Kara spin_lock(&dq_list_lock); 547884d179dSJan Kara list_for_each_entry(dquot, &inuse_list, dq_inuse) { 548884d179dSJan Kara if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) 549884d179dSJan Kara continue; 550884d179dSJan Kara if (dquot->dq_sb != sb) 551884d179dSJan Kara continue; 552884d179dSJan Kara /* Now we have active dquot so we can just increase use count */ 553884d179dSJan Kara atomic_inc(&dquot->dq_count); 554884d179dSJan Kara dqstats.lookups++; 555884d179dSJan Kara spin_unlock(&dq_list_lock); 556884d179dSJan Kara dqput(old_dquot); 557884d179dSJan Kara old_dquot = dquot; 558884d179dSJan Kara ret = fn(dquot, priv); 559884d179dSJan Kara if (ret < 0) 560884d179dSJan Kara goto out; 561884d179dSJan Kara spin_lock(&dq_list_lock); 562884d179dSJan Kara /* We are safe to continue now because our dquot could not 563884d179dSJan Kara * be moved out of the inuse list while we hold the reference */ 564884d179dSJan Kara } 565884d179dSJan Kara spin_unlock(&dq_list_lock); 566884d179dSJan Kara out: 567884d179dSJan Kara dqput(old_dquot); 568884d179dSJan Kara mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); 569884d179dSJan Kara return ret; 570884d179dSJan Kara } 571884d179dSJan Kara EXPORT_SYMBOL(dquot_scan_active); 572884d179dSJan Kara 573*5fb324adSChristoph Hellwig int vfs_quota_sync(struct super_block *sb, int type, int wait) 574884d179dSJan Kara { 575884d179dSJan Kara struct list_head *dirty; 576884d179dSJan Kara struct dquot *dquot; 577884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 578884d179dSJan Kara int cnt; 579884d179dSJan Kara 580884d179dSJan Kara mutex_lock(&dqopt->dqonoff_mutex); 581884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 582884d179dSJan Kara if (type != -1 && cnt != type) 583884d179dSJan Kara continue; 584884d179dSJan Kara if (!sb_has_quota_active(sb, cnt)) 585884d179dSJan Kara continue; 586884d179dSJan Kara spin_lock(&dq_list_lock); 587884d179dSJan Kara dirty = &dqopt->info[cnt].dqi_dirty_list; 588884d179dSJan Kara while (!list_empty(dirty)) { 589268157baSJan Kara dquot = list_first_entry(dirty, struct dquot, 590268157baSJan Kara dq_dirty); 591884d179dSJan Kara /* Dirty and inactive can be only bad dquot... */ 592884d179dSJan Kara if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { 593884d179dSJan Kara clear_dquot_dirty(dquot); 594884d179dSJan Kara continue; 595884d179dSJan Kara } 596884d179dSJan Kara /* Now we have active dquot from which someone is 597884d179dSJan Kara * holding reference so we can safely just increase 598884d179dSJan Kara * use count */ 599884d179dSJan Kara atomic_inc(&dquot->dq_count); 600884d179dSJan Kara dqstats.lookups++; 601884d179dSJan Kara spin_unlock(&dq_list_lock); 602884d179dSJan Kara sb->dq_op->write_dquot(dquot); 603884d179dSJan Kara dqput(dquot); 604884d179dSJan Kara spin_lock(&dq_list_lock); 605884d179dSJan Kara } 606884d179dSJan Kara spin_unlock(&dq_list_lock); 607884d179dSJan Kara } 608884d179dSJan Kara 609884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 610884d179dSJan Kara if ((cnt == type || type == -1) && sb_has_quota_active(sb, cnt) 611884d179dSJan Kara && info_dirty(&dqopt->info[cnt])) 612884d179dSJan Kara sb->dq_op->write_info(sb, cnt); 613884d179dSJan Kara spin_lock(&dq_list_lock); 614884d179dSJan Kara dqstats.syncs++; 615884d179dSJan Kara spin_unlock(&dq_list_lock); 616884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 617884d179dSJan Kara 618*5fb324adSChristoph Hellwig if (!wait || (sb_dqopt(sb)->flags & DQUOT_QUOTA_SYS_FILE)) 619*5fb324adSChristoph Hellwig return 0; 620*5fb324adSChristoph Hellwig 621*5fb324adSChristoph Hellwig /* This is not very clever (and fast) but currently I don't know about 622*5fb324adSChristoph Hellwig * any other simple way of getting quota data to disk and we must get 623*5fb324adSChristoph Hellwig * them there for userspace to be visible... */ 624*5fb324adSChristoph Hellwig if (sb->s_op->sync_fs) 625*5fb324adSChristoph Hellwig sb->s_op->sync_fs(sb, 1); 626*5fb324adSChristoph Hellwig sync_blockdev(sb->s_bdev); 627*5fb324adSChristoph Hellwig 628*5fb324adSChristoph Hellwig /* 629*5fb324adSChristoph Hellwig * Now when everything is written we can discard the pagecache so 630*5fb324adSChristoph Hellwig * that userspace sees the changes. 631*5fb324adSChristoph Hellwig */ 632*5fb324adSChristoph Hellwig mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); 633*5fb324adSChristoph Hellwig for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 634*5fb324adSChristoph Hellwig if (type != -1 && cnt != type) 635*5fb324adSChristoph Hellwig continue; 636*5fb324adSChristoph Hellwig if (!sb_has_quota_active(sb, cnt)) 637*5fb324adSChristoph Hellwig continue; 638*5fb324adSChristoph Hellwig mutex_lock_nested(&sb_dqopt(sb)->files[cnt]->i_mutex, 639*5fb324adSChristoph Hellwig I_MUTEX_QUOTA); 640*5fb324adSChristoph Hellwig truncate_inode_pages(&sb_dqopt(sb)->files[cnt]->i_data, 0); 641*5fb324adSChristoph Hellwig mutex_unlock(&sb_dqopt(sb)->files[cnt]->i_mutex); 642*5fb324adSChristoph Hellwig } 643*5fb324adSChristoph Hellwig mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); 644*5fb324adSChristoph Hellwig 645884d179dSJan Kara return 0; 646884d179dSJan Kara } 647884d179dSJan Kara EXPORT_SYMBOL(vfs_quota_sync); 648884d179dSJan Kara 649884d179dSJan Kara /* Free unused dquots from cache */ 650884d179dSJan Kara static void prune_dqcache(int count) 651884d179dSJan Kara { 652884d179dSJan Kara struct list_head *head; 653884d179dSJan Kara struct dquot *dquot; 654884d179dSJan Kara 655884d179dSJan Kara head = free_dquots.prev; 656884d179dSJan Kara while (head != &free_dquots && count) { 657884d179dSJan Kara dquot = list_entry(head, struct dquot, dq_free); 658884d179dSJan Kara remove_dquot_hash(dquot); 659884d179dSJan Kara remove_free_dquot(dquot); 660884d179dSJan Kara remove_inuse(dquot); 661884d179dSJan Kara do_destroy_dquot(dquot); 662884d179dSJan Kara count--; 663884d179dSJan Kara head = free_dquots.prev; 664884d179dSJan Kara } 665884d179dSJan Kara } 666884d179dSJan Kara 667884d179dSJan Kara /* 668884d179dSJan Kara * This is called from kswapd when we think we need some 669884d179dSJan Kara * more memory 670884d179dSJan Kara */ 671884d179dSJan Kara 672884d179dSJan Kara static int shrink_dqcache_memory(int nr, gfp_t gfp_mask) 673884d179dSJan Kara { 674884d179dSJan Kara if (nr) { 675884d179dSJan Kara spin_lock(&dq_list_lock); 676884d179dSJan Kara prune_dqcache(nr); 677884d179dSJan Kara spin_unlock(&dq_list_lock); 678884d179dSJan Kara } 679884d179dSJan Kara return (dqstats.free_dquots / 100) * sysctl_vfs_cache_pressure; 680884d179dSJan Kara } 681884d179dSJan Kara 682884d179dSJan Kara static struct shrinker dqcache_shrinker = { 683884d179dSJan Kara .shrink = shrink_dqcache_memory, 684884d179dSJan Kara .seeks = DEFAULT_SEEKS, 685884d179dSJan Kara }; 686884d179dSJan Kara 687884d179dSJan Kara /* 688884d179dSJan Kara * Put reference to dquot 689884d179dSJan Kara * NOTE: If you change this function please check whether dqput_blocks() works right... 690884d179dSJan Kara */ 691884d179dSJan Kara void dqput(struct dquot *dquot) 692884d179dSJan Kara { 693884d179dSJan Kara int ret; 694884d179dSJan Kara 695884d179dSJan Kara if (!dquot) 696884d179dSJan Kara return; 697884d179dSJan Kara #ifdef __DQUOT_PARANOIA 698884d179dSJan Kara if (!atomic_read(&dquot->dq_count)) { 699884d179dSJan Kara printk("VFS: dqput: trying to free free dquot\n"); 700884d179dSJan Kara printk("VFS: device %s, dquot of %s %d\n", 701884d179dSJan Kara dquot->dq_sb->s_id, 702884d179dSJan Kara quotatypes[dquot->dq_type], 703884d179dSJan Kara dquot->dq_id); 704884d179dSJan Kara BUG(); 705884d179dSJan Kara } 706884d179dSJan Kara #endif 707884d179dSJan Kara 708884d179dSJan Kara spin_lock(&dq_list_lock); 709884d179dSJan Kara dqstats.drops++; 710884d179dSJan Kara spin_unlock(&dq_list_lock); 711884d179dSJan Kara we_slept: 712884d179dSJan Kara spin_lock(&dq_list_lock); 713884d179dSJan Kara if (atomic_read(&dquot->dq_count) > 1) { 714884d179dSJan Kara /* We have more than one user... nothing to do */ 715884d179dSJan Kara atomic_dec(&dquot->dq_count); 716884d179dSJan Kara /* Releasing dquot during quotaoff phase? */ 717884d179dSJan Kara if (!sb_has_quota_active(dquot->dq_sb, dquot->dq_type) && 718884d179dSJan Kara atomic_read(&dquot->dq_count) == 1) 719884d179dSJan Kara wake_up(&dquot->dq_wait_unused); 720884d179dSJan Kara spin_unlock(&dq_list_lock); 721884d179dSJan Kara return; 722884d179dSJan Kara } 723884d179dSJan Kara /* Need to release dquot? */ 724884d179dSJan Kara if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && dquot_dirty(dquot)) { 725884d179dSJan Kara spin_unlock(&dq_list_lock); 726884d179dSJan Kara /* Commit dquot before releasing */ 727884d179dSJan Kara ret = dquot->dq_sb->dq_op->write_dquot(dquot); 728884d179dSJan Kara if (ret < 0) { 729884d179dSJan Kara printk(KERN_ERR "VFS: cannot write quota structure on " 730884d179dSJan Kara "device %s (error %d). Quota may get out of " 731884d179dSJan Kara "sync!\n", dquot->dq_sb->s_id, ret); 732884d179dSJan Kara /* 733884d179dSJan Kara * We clear dirty bit anyway, so that we avoid 734884d179dSJan Kara * infinite loop here 735884d179dSJan Kara */ 736884d179dSJan Kara spin_lock(&dq_list_lock); 737884d179dSJan Kara clear_dquot_dirty(dquot); 738884d179dSJan Kara spin_unlock(&dq_list_lock); 739884d179dSJan Kara } 740884d179dSJan Kara goto we_slept; 741884d179dSJan Kara } 742884d179dSJan Kara /* Clear flag in case dquot was inactive (something bad happened) */ 743884d179dSJan Kara clear_dquot_dirty(dquot); 744884d179dSJan Kara if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { 745884d179dSJan Kara spin_unlock(&dq_list_lock); 746884d179dSJan Kara dquot->dq_sb->dq_op->release_dquot(dquot); 747884d179dSJan Kara goto we_slept; 748884d179dSJan Kara } 749884d179dSJan Kara atomic_dec(&dquot->dq_count); 750884d179dSJan Kara #ifdef __DQUOT_PARANOIA 751884d179dSJan Kara /* sanity check */ 752884d179dSJan Kara BUG_ON(!list_empty(&dquot->dq_free)); 753884d179dSJan Kara #endif 754884d179dSJan Kara put_dquot_last(dquot); 755884d179dSJan Kara spin_unlock(&dq_list_lock); 756884d179dSJan Kara } 757884d179dSJan Kara EXPORT_SYMBOL(dqput); 758884d179dSJan Kara 759884d179dSJan Kara struct dquot *dquot_alloc(struct super_block *sb, int type) 760884d179dSJan Kara { 761884d179dSJan Kara return kmem_cache_zalloc(dquot_cachep, GFP_NOFS); 762884d179dSJan Kara } 763884d179dSJan Kara EXPORT_SYMBOL(dquot_alloc); 764884d179dSJan Kara 765884d179dSJan Kara static struct dquot *get_empty_dquot(struct super_block *sb, int type) 766884d179dSJan Kara { 767884d179dSJan Kara struct dquot *dquot; 768884d179dSJan Kara 769884d179dSJan Kara dquot = sb->dq_op->alloc_dquot(sb, type); 770884d179dSJan Kara if(!dquot) 771dd6f3c6dSJan Kara return NULL; 772884d179dSJan Kara 773884d179dSJan Kara mutex_init(&dquot->dq_lock); 774884d179dSJan Kara INIT_LIST_HEAD(&dquot->dq_free); 775884d179dSJan Kara INIT_LIST_HEAD(&dquot->dq_inuse); 776884d179dSJan Kara INIT_HLIST_NODE(&dquot->dq_hash); 777884d179dSJan Kara INIT_LIST_HEAD(&dquot->dq_dirty); 778884d179dSJan Kara init_waitqueue_head(&dquot->dq_wait_unused); 779884d179dSJan Kara dquot->dq_sb = sb; 780884d179dSJan Kara dquot->dq_type = type; 781884d179dSJan Kara atomic_set(&dquot->dq_count, 1); 782884d179dSJan Kara 783884d179dSJan Kara return dquot; 784884d179dSJan Kara } 785884d179dSJan Kara 786884d179dSJan Kara /* 787884d179dSJan Kara * Get reference to dquot 788884d179dSJan Kara * 789884d179dSJan Kara * Locking is slightly tricky here. We are guarded from parallel quotaoff() 790884d179dSJan Kara * destroying our dquot by: 791884d179dSJan Kara * a) checking for quota flags under dq_list_lock and 792884d179dSJan Kara * b) getting a reference to dquot before we release dq_list_lock 793884d179dSJan Kara */ 794884d179dSJan Kara struct dquot *dqget(struct super_block *sb, unsigned int id, int type) 795884d179dSJan Kara { 796884d179dSJan Kara unsigned int hashent = hashfn(sb, id, type); 797dd6f3c6dSJan Kara struct dquot *dquot = NULL, *empty = NULL; 798884d179dSJan Kara 799884d179dSJan Kara if (!sb_has_quota_active(sb, type)) 800dd6f3c6dSJan Kara return NULL; 801884d179dSJan Kara we_slept: 802884d179dSJan Kara spin_lock(&dq_list_lock); 803884d179dSJan Kara spin_lock(&dq_state_lock); 804884d179dSJan Kara if (!sb_has_quota_active(sb, type)) { 805884d179dSJan Kara spin_unlock(&dq_state_lock); 806884d179dSJan Kara spin_unlock(&dq_list_lock); 807884d179dSJan Kara goto out; 808884d179dSJan Kara } 809884d179dSJan Kara spin_unlock(&dq_state_lock); 810884d179dSJan Kara 811dd6f3c6dSJan Kara dquot = find_dquot(hashent, sb, id, type); 812dd6f3c6dSJan Kara if (!dquot) { 813dd6f3c6dSJan Kara if (!empty) { 814884d179dSJan Kara spin_unlock(&dq_list_lock); 815dd6f3c6dSJan Kara empty = get_empty_dquot(sb, type); 816dd6f3c6dSJan Kara if (!empty) 817884d179dSJan Kara schedule(); /* Try to wait for a moment... */ 818884d179dSJan Kara goto we_slept; 819884d179dSJan Kara } 820884d179dSJan Kara dquot = empty; 821dd6f3c6dSJan Kara empty = NULL; 822884d179dSJan Kara dquot->dq_id = id; 823884d179dSJan Kara /* all dquots go on the inuse_list */ 824884d179dSJan Kara put_inuse(dquot); 825884d179dSJan Kara /* hash it first so it can be found */ 826884d179dSJan Kara insert_dquot_hash(dquot); 827884d179dSJan Kara dqstats.lookups++; 828884d179dSJan Kara spin_unlock(&dq_list_lock); 829884d179dSJan Kara } else { 830884d179dSJan Kara if (!atomic_read(&dquot->dq_count)) 831884d179dSJan Kara remove_free_dquot(dquot); 832884d179dSJan Kara atomic_inc(&dquot->dq_count); 833884d179dSJan Kara dqstats.cache_hits++; 834884d179dSJan Kara dqstats.lookups++; 835884d179dSJan Kara spin_unlock(&dq_list_lock); 836884d179dSJan Kara } 837268157baSJan Kara /* Wait for dq_lock - after this we know that either dquot_release() is 838268157baSJan Kara * already finished or it will be canceled due to dq_count > 1 test */ 839884d179dSJan Kara wait_on_dquot(dquot); 840268157baSJan Kara /* Read the dquot / allocate space in quota file */ 841268157baSJan Kara if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && 842268157baSJan Kara sb->dq_op->acquire_dquot(dquot) < 0) { 843884d179dSJan Kara dqput(dquot); 844dd6f3c6dSJan Kara dquot = NULL; 845884d179dSJan Kara goto out; 846884d179dSJan Kara } 847884d179dSJan Kara #ifdef __DQUOT_PARANOIA 848884d179dSJan Kara BUG_ON(!dquot->dq_sb); /* Has somebody invalidated entry under us? */ 849884d179dSJan Kara #endif 850884d179dSJan Kara out: 851884d179dSJan Kara if (empty) 852884d179dSJan Kara do_destroy_dquot(empty); 853884d179dSJan Kara 854884d179dSJan Kara return dquot; 855884d179dSJan Kara } 856884d179dSJan Kara EXPORT_SYMBOL(dqget); 857884d179dSJan Kara 858884d179dSJan Kara static int dqinit_needed(struct inode *inode, int type) 859884d179dSJan Kara { 860884d179dSJan Kara int cnt; 861884d179dSJan Kara 862884d179dSJan Kara if (IS_NOQUOTA(inode)) 863884d179dSJan Kara return 0; 864884d179dSJan Kara if (type != -1) 865dd6f3c6dSJan Kara return !inode->i_dquot[type]; 866884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 867dd6f3c6dSJan Kara if (!inode->i_dquot[cnt]) 868884d179dSJan Kara return 1; 869884d179dSJan Kara return 0; 870884d179dSJan Kara } 871884d179dSJan Kara 872884d179dSJan Kara /* This routine is guarded by dqonoff_mutex mutex */ 873884d179dSJan Kara static void add_dquot_ref(struct super_block *sb, int type) 874884d179dSJan Kara { 875884d179dSJan Kara struct inode *inode, *old_inode = NULL; 8760a5a9c72SJan Kara int reserved = 0; 877884d179dSJan Kara 878884d179dSJan Kara spin_lock(&inode_lock); 879884d179dSJan Kara list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { 880b6fac63cSWu Fengguang if (inode->i_state & (I_FREEING|I_CLEAR|I_WILL_FREE|I_NEW)) 8813ae5080fSLinus Torvalds continue; 8820a5a9c72SJan Kara if (unlikely(inode_get_rsv_space(inode) > 0)) 8830a5a9c72SJan Kara reserved = 1; 884884d179dSJan Kara if (!atomic_read(&inode->i_writecount)) 885884d179dSJan Kara continue; 886884d179dSJan Kara if (!dqinit_needed(inode, type)) 887884d179dSJan Kara continue; 888884d179dSJan Kara 889884d179dSJan Kara __iget(inode); 890884d179dSJan Kara spin_unlock(&inode_lock); 891884d179dSJan Kara 892884d179dSJan Kara iput(old_inode); 893884d179dSJan Kara sb->dq_op->initialize(inode, type); 894884d179dSJan Kara /* We hold a reference to 'inode' so it couldn't have been 895884d179dSJan Kara * removed from s_inodes list while we dropped the inode_lock. 896884d179dSJan Kara * We cannot iput the inode now as we can be holding the last 897884d179dSJan Kara * reference and we cannot iput it under inode_lock. So we 898884d179dSJan Kara * keep the reference and iput it later. */ 899884d179dSJan Kara old_inode = inode; 900884d179dSJan Kara spin_lock(&inode_lock); 901884d179dSJan Kara } 902884d179dSJan Kara spin_unlock(&inode_lock); 903884d179dSJan Kara iput(old_inode); 9040a5a9c72SJan Kara 9050a5a9c72SJan Kara if (reserved) { 9060a5a9c72SJan Kara printk(KERN_WARNING "VFS (%s): Writes happened before quota" 9070a5a9c72SJan Kara " was turned on thus quota information is probably " 9080a5a9c72SJan Kara "inconsistent. Please run quotacheck(8).\n", sb->s_id); 9090a5a9c72SJan Kara } 910884d179dSJan Kara } 911884d179dSJan Kara 912268157baSJan Kara /* 913268157baSJan Kara * Return 0 if dqput() won't block. 914268157baSJan Kara * (note that 1 doesn't necessarily mean blocking) 915268157baSJan Kara */ 916884d179dSJan Kara static inline int dqput_blocks(struct dquot *dquot) 917884d179dSJan Kara { 918884d179dSJan Kara if (atomic_read(&dquot->dq_count) <= 1) 919884d179dSJan Kara return 1; 920884d179dSJan Kara return 0; 921884d179dSJan Kara } 922884d179dSJan Kara 923268157baSJan Kara /* 924268157baSJan Kara * Remove references to dquots from inode and add dquot to list for freeing 925268157baSJan Kara * if we have the last referece to dquot 926268157baSJan Kara * We can't race with anybody because we hold dqptr_sem for writing... 927268157baSJan Kara */ 928884d179dSJan Kara static int remove_inode_dquot_ref(struct inode *inode, int type, 929884d179dSJan Kara struct list_head *tofree_head) 930884d179dSJan Kara { 931884d179dSJan Kara struct dquot *dquot = inode->i_dquot[type]; 932884d179dSJan Kara 933dd6f3c6dSJan Kara inode->i_dquot[type] = NULL; 934dd6f3c6dSJan Kara if (dquot) { 935884d179dSJan Kara if (dqput_blocks(dquot)) { 936884d179dSJan Kara #ifdef __DQUOT_PARANOIA 937884d179dSJan Kara if (atomic_read(&dquot->dq_count) != 1) 938884d179dSJan Kara printk(KERN_WARNING "VFS: Adding dquot with dq_count %d to dispose list.\n", atomic_read(&dquot->dq_count)); 939884d179dSJan Kara #endif 940884d179dSJan Kara spin_lock(&dq_list_lock); 941268157baSJan Kara /* As dquot must have currently users it can't be on 942268157baSJan Kara * the free list... */ 943268157baSJan Kara list_add(&dquot->dq_free, tofree_head); 944884d179dSJan Kara spin_unlock(&dq_list_lock); 945884d179dSJan Kara return 1; 946884d179dSJan Kara } 947884d179dSJan Kara else 948884d179dSJan Kara dqput(dquot); /* We have guaranteed we won't block */ 949884d179dSJan Kara } 950884d179dSJan Kara return 0; 951884d179dSJan Kara } 952884d179dSJan Kara 953268157baSJan Kara /* 954268157baSJan Kara * Free list of dquots 955268157baSJan Kara * Dquots are removed from inodes and no new references can be got so we are 956268157baSJan Kara * the only ones holding reference 957268157baSJan Kara */ 958884d179dSJan Kara static void put_dquot_list(struct list_head *tofree_head) 959884d179dSJan Kara { 960884d179dSJan Kara struct list_head *act_head; 961884d179dSJan Kara struct dquot *dquot; 962884d179dSJan Kara 963884d179dSJan Kara act_head = tofree_head->next; 964884d179dSJan Kara while (act_head != tofree_head) { 965884d179dSJan Kara dquot = list_entry(act_head, struct dquot, dq_free); 966884d179dSJan Kara act_head = act_head->next; 967268157baSJan Kara /* Remove dquot from the list so we won't have problems... */ 968268157baSJan Kara list_del_init(&dquot->dq_free); 969884d179dSJan Kara dqput(dquot); 970884d179dSJan Kara } 971884d179dSJan Kara } 972884d179dSJan Kara 973884d179dSJan Kara static void remove_dquot_ref(struct super_block *sb, int type, 974884d179dSJan Kara struct list_head *tofree_head) 975884d179dSJan Kara { 976884d179dSJan Kara struct inode *inode; 977884d179dSJan Kara 978884d179dSJan Kara spin_lock(&inode_lock); 979884d179dSJan Kara list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { 9803ae5080fSLinus Torvalds /* 9813ae5080fSLinus Torvalds * We have to scan also I_NEW inodes because they can already 9823ae5080fSLinus Torvalds * have quota pointer initialized. Luckily, we need to touch 9833ae5080fSLinus Torvalds * only quota pointers and these have separate locking 9843ae5080fSLinus Torvalds * (dqptr_sem). 9853ae5080fSLinus Torvalds */ 986884d179dSJan Kara if (!IS_NOQUOTA(inode)) 987884d179dSJan Kara remove_inode_dquot_ref(inode, type, tofree_head); 988884d179dSJan Kara } 989884d179dSJan Kara spin_unlock(&inode_lock); 990884d179dSJan Kara } 991884d179dSJan Kara 992884d179dSJan Kara /* Gather all references from inodes and drop them */ 993884d179dSJan Kara static void drop_dquot_ref(struct super_block *sb, int type) 994884d179dSJan Kara { 995884d179dSJan Kara LIST_HEAD(tofree_head); 996884d179dSJan Kara 997884d179dSJan Kara if (sb->dq_op) { 998884d179dSJan Kara down_write(&sb_dqopt(sb)->dqptr_sem); 999884d179dSJan Kara remove_dquot_ref(sb, type, &tofree_head); 1000884d179dSJan Kara up_write(&sb_dqopt(sb)->dqptr_sem); 1001884d179dSJan Kara put_dquot_list(&tofree_head); 1002884d179dSJan Kara } 1003884d179dSJan Kara } 1004884d179dSJan Kara 1005884d179dSJan Kara static inline void dquot_incr_inodes(struct dquot *dquot, qsize_t number) 1006884d179dSJan Kara { 1007884d179dSJan Kara dquot->dq_dqb.dqb_curinodes += number; 1008884d179dSJan Kara } 1009884d179dSJan Kara 1010884d179dSJan Kara static inline void dquot_incr_space(struct dquot *dquot, qsize_t number) 1011884d179dSJan Kara { 1012884d179dSJan Kara dquot->dq_dqb.dqb_curspace += number; 1013884d179dSJan Kara } 1014884d179dSJan Kara 1015884d179dSJan Kara static inline void dquot_resv_space(struct dquot *dquot, qsize_t number) 1016884d179dSJan Kara { 1017884d179dSJan Kara dquot->dq_dqb.dqb_rsvspace += number; 1018884d179dSJan Kara } 1019884d179dSJan Kara 1020884d179dSJan Kara /* 1021884d179dSJan Kara * Claim reserved quota space 1022884d179dSJan Kara */ 10230a5a9c72SJan Kara static void dquot_claim_reserved_space(struct dquot *dquot, qsize_t number) 1024884d179dSJan Kara { 10250a5a9c72SJan Kara if (dquot->dq_dqb.dqb_rsvspace < number) { 10260a5a9c72SJan Kara WARN_ON_ONCE(1); 10270a5a9c72SJan Kara number = dquot->dq_dqb.dqb_rsvspace; 10280a5a9c72SJan Kara } 1029884d179dSJan Kara dquot->dq_dqb.dqb_curspace += number; 1030884d179dSJan Kara dquot->dq_dqb.dqb_rsvspace -= number; 1031884d179dSJan Kara } 1032884d179dSJan Kara 1033884d179dSJan Kara static inline 1034884d179dSJan Kara void dquot_free_reserved_space(struct dquot *dquot, qsize_t number) 1035884d179dSJan Kara { 10360a5a9c72SJan Kara if (dquot->dq_dqb.dqb_rsvspace >= number) 1037884d179dSJan Kara dquot->dq_dqb.dqb_rsvspace -= number; 10380a5a9c72SJan Kara else { 10390a5a9c72SJan Kara WARN_ON_ONCE(1); 10400a5a9c72SJan Kara dquot->dq_dqb.dqb_rsvspace = 0; 10410a5a9c72SJan Kara } 1042884d179dSJan Kara } 1043884d179dSJan Kara 10447a2435d8SJan Kara static void dquot_decr_inodes(struct dquot *dquot, qsize_t number) 1045884d179dSJan Kara { 1046884d179dSJan Kara if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE || 1047884d179dSJan Kara dquot->dq_dqb.dqb_curinodes >= number) 1048884d179dSJan Kara dquot->dq_dqb.dqb_curinodes -= number; 1049884d179dSJan Kara else 1050884d179dSJan Kara dquot->dq_dqb.dqb_curinodes = 0; 1051884d179dSJan Kara if (dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit) 1052884d179dSJan Kara dquot->dq_dqb.dqb_itime = (time_t) 0; 1053884d179dSJan Kara clear_bit(DQ_INODES_B, &dquot->dq_flags); 1054884d179dSJan Kara } 1055884d179dSJan Kara 10567a2435d8SJan Kara static void dquot_decr_space(struct dquot *dquot, qsize_t number) 1057884d179dSJan Kara { 1058884d179dSJan Kara if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE || 1059884d179dSJan Kara dquot->dq_dqb.dqb_curspace >= number) 1060884d179dSJan Kara dquot->dq_dqb.dqb_curspace -= number; 1061884d179dSJan Kara else 1062884d179dSJan Kara dquot->dq_dqb.dqb_curspace = 0; 1063884d179dSJan Kara if (dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit) 1064884d179dSJan Kara dquot->dq_dqb.dqb_btime = (time_t) 0; 1065884d179dSJan Kara clear_bit(DQ_BLKS_B, &dquot->dq_flags); 1066884d179dSJan Kara } 1067884d179dSJan Kara 1068884d179dSJan Kara static int warning_issued(struct dquot *dquot, const int warntype) 1069884d179dSJan Kara { 1070884d179dSJan Kara int flag = (warntype == QUOTA_NL_BHARDWARN || 1071884d179dSJan Kara warntype == QUOTA_NL_BSOFTLONGWARN) ? DQ_BLKS_B : 1072884d179dSJan Kara ((warntype == QUOTA_NL_IHARDWARN || 1073884d179dSJan Kara warntype == QUOTA_NL_ISOFTLONGWARN) ? DQ_INODES_B : 0); 1074884d179dSJan Kara 1075884d179dSJan Kara if (!flag) 1076884d179dSJan Kara return 0; 1077884d179dSJan Kara return test_and_set_bit(flag, &dquot->dq_flags); 1078884d179dSJan Kara } 1079884d179dSJan Kara 1080884d179dSJan Kara #ifdef CONFIG_PRINT_QUOTA_WARNING 1081884d179dSJan Kara static int flag_print_warnings = 1; 1082884d179dSJan Kara 10837a2435d8SJan Kara static int need_print_warning(struct dquot *dquot) 1084884d179dSJan Kara { 1085884d179dSJan Kara if (!flag_print_warnings) 1086884d179dSJan Kara return 0; 1087884d179dSJan Kara 1088884d179dSJan Kara switch (dquot->dq_type) { 1089884d179dSJan Kara case USRQUOTA: 1090884d179dSJan Kara return current_fsuid() == dquot->dq_id; 1091884d179dSJan Kara case GRPQUOTA: 1092884d179dSJan Kara return in_group_p(dquot->dq_id); 1093884d179dSJan Kara } 1094884d179dSJan Kara return 0; 1095884d179dSJan Kara } 1096884d179dSJan Kara 1097884d179dSJan Kara /* Print warning to user which exceeded quota */ 1098884d179dSJan Kara static void print_warning(struct dquot *dquot, const int warntype) 1099884d179dSJan Kara { 1100884d179dSJan Kara char *msg = NULL; 1101884d179dSJan Kara struct tty_struct *tty; 1102884d179dSJan Kara 1103884d179dSJan Kara if (warntype == QUOTA_NL_IHARDBELOW || 1104884d179dSJan Kara warntype == QUOTA_NL_ISOFTBELOW || 1105884d179dSJan Kara warntype == QUOTA_NL_BHARDBELOW || 1106884d179dSJan Kara warntype == QUOTA_NL_BSOFTBELOW || !need_print_warning(dquot)) 1107884d179dSJan Kara return; 1108884d179dSJan Kara 1109884d179dSJan Kara tty = get_current_tty(); 1110884d179dSJan Kara if (!tty) 1111884d179dSJan Kara return; 1112884d179dSJan Kara tty_write_message(tty, dquot->dq_sb->s_id); 1113884d179dSJan Kara if (warntype == QUOTA_NL_ISOFTWARN || warntype == QUOTA_NL_BSOFTWARN) 1114884d179dSJan Kara tty_write_message(tty, ": warning, "); 1115884d179dSJan Kara else 1116884d179dSJan Kara tty_write_message(tty, ": write failed, "); 1117884d179dSJan Kara tty_write_message(tty, quotatypes[dquot->dq_type]); 1118884d179dSJan Kara switch (warntype) { 1119884d179dSJan Kara case QUOTA_NL_IHARDWARN: 1120884d179dSJan Kara msg = " file limit reached.\r\n"; 1121884d179dSJan Kara break; 1122884d179dSJan Kara case QUOTA_NL_ISOFTLONGWARN: 1123884d179dSJan Kara msg = " file quota exceeded too long.\r\n"; 1124884d179dSJan Kara break; 1125884d179dSJan Kara case QUOTA_NL_ISOFTWARN: 1126884d179dSJan Kara msg = " file quota exceeded.\r\n"; 1127884d179dSJan Kara break; 1128884d179dSJan Kara case QUOTA_NL_BHARDWARN: 1129884d179dSJan Kara msg = " block limit reached.\r\n"; 1130884d179dSJan Kara break; 1131884d179dSJan Kara case QUOTA_NL_BSOFTLONGWARN: 1132884d179dSJan Kara msg = " block quota exceeded too long.\r\n"; 1133884d179dSJan Kara break; 1134884d179dSJan Kara case QUOTA_NL_BSOFTWARN: 1135884d179dSJan Kara msg = " block quota exceeded.\r\n"; 1136884d179dSJan Kara break; 1137884d179dSJan Kara } 1138884d179dSJan Kara tty_write_message(tty, msg); 1139884d179dSJan Kara tty_kref_put(tty); 1140884d179dSJan Kara } 1141884d179dSJan Kara #endif 1142884d179dSJan Kara 1143884d179dSJan Kara /* 1144884d179dSJan Kara * Write warnings to the console and send warning messages over netlink. 1145884d179dSJan Kara * 1146884d179dSJan Kara * Note that this function can sleep. 1147884d179dSJan Kara */ 11487a2435d8SJan Kara static void flush_warnings(struct dquot *const *dquots, char *warntype) 1149884d179dSJan Kara { 115086e931a3SSteven Whitehouse struct dquot *dq; 1151884d179dSJan Kara int i; 1152884d179dSJan Kara 115386e931a3SSteven Whitehouse for (i = 0; i < MAXQUOTAS; i++) { 115486e931a3SSteven Whitehouse dq = dquots[i]; 115586e931a3SSteven Whitehouse if (dq && warntype[i] != QUOTA_NL_NOWARN && 115686e931a3SSteven Whitehouse !warning_issued(dq, warntype[i])) { 1157884d179dSJan Kara #ifdef CONFIG_PRINT_QUOTA_WARNING 115886e931a3SSteven Whitehouse print_warning(dq, warntype[i]); 1159884d179dSJan Kara #endif 116086e931a3SSteven Whitehouse quota_send_warning(dq->dq_type, dq->dq_id, 116186e931a3SSteven Whitehouse dq->dq_sb->s_dev, warntype[i]); 116286e931a3SSteven Whitehouse } 1163884d179dSJan Kara } 1164884d179dSJan Kara } 1165884d179dSJan Kara 11667a2435d8SJan Kara static int ignore_hardlimit(struct dquot *dquot) 1167884d179dSJan Kara { 1168884d179dSJan Kara struct mem_dqinfo *info = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_type]; 1169884d179dSJan Kara 1170884d179dSJan Kara return capable(CAP_SYS_RESOURCE) && 1171268157baSJan Kara (info->dqi_format->qf_fmt_id != QFMT_VFS_OLD || 1172268157baSJan Kara !(info->dqi_flags & V1_DQF_RSQUASH)); 1173884d179dSJan Kara } 1174884d179dSJan Kara 1175884d179dSJan Kara /* needs dq_data_lock */ 1176884d179dSJan Kara static int check_idq(struct dquot *dquot, qsize_t inodes, char *warntype) 1177884d179dSJan Kara { 1178268157baSJan Kara qsize_t newinodes = dquot->dq_dqb.dqb_curinodes + inodes; 1179268157baSJan Kara 1180884d179dSJan Kara *warntype = QUOTA_NL_NOWARN; 1181884d179dSJan Kara if (!sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_type) || 1182884d179dSJan Kara test_bit(DQ_FAKE_B, &dquot->dq_flags)) 1183884d179dSJan Kara return QUOTA_OK; 1184884d179dSJan Kara 1185884d179dSJan Kara if (dquot->dq_dqb.dqb_ihardlimit && 1186268157baSJan Kara newinodes > dquot->dq_dqb.dqb_ihardlimit && 1187884d179dSJan Kara !ignore_hardlimit(dquot)) { 1188884d179dSJan Kara *warntype = QUOTA_NL_IHARDWARN; 1189884d179dSJan Kara return NO_QUOTA; 1190884d179dSJan Kara } 1191884d179dSJan Kara 1192884d179dSJan Kara if (dquot->dq_dqb.dqb_isoftlimit && 1193268157baSJan Kara newinodes > dquot->dq_dqb.dqb_isoftlimit && 1194268157baSJan Kara dquot->dq_dqb.dqb_itime && 1195268157baSJan Kara get_seconds() >= dquot->dq_dqb.dqb_itime && 1196884d179dSJan Kara !ignore_hardlimit(dquot)) { 1197884d179dSJan Kara *warntype = QUOTA_NL_ISOFTLONGWARN; 1198884d179dSJan Kara return NO_QUOTA; 1199884d179dSJan Kara } 1200884d179dSJan Kara 1201884d179dSJan Kara if (dquot->dq_dqb.dqb_isoftlimit && 1202268157baSJan Kara newinodes > dquot->dq_dqb.dqb_isoftlimit && 1203884d179dSJan Kara dquot->dq_dqb.dqb_itime == 0) { 1204884d179dSJan Kara *warntype = QUOTA_NL_ISOFTWARN; 1205268157baSJan Kara dquot->dq_dqb.dqb_itime = get_seconds() + 1206268157baSJan Kara sb_dqopt(dquot->dq_sb)->info[dquot->dq_type].dqi_igrace; 1207884d179dSJan Kara } 1208884d179dSJan Kara 1209884d179dSJan Kara return QUOTA_OK; 1210884d179dSJan Kara } 1211884d179dSJan Kara 1212884d179dSJan Kara /* needs dq_data_lock */ 1213884d179dSJan Kara static int check_bdq(struct dquot *dquot, qsize_t space, int prealloc, char *warntype) 1214884d179dSJan Kara { 1215884d179dSJan Kara qsize_t tspace; 1216268157baSJan Kara struct super_block *sb = dquot->dq_sb; 1217884d179dSJan Kara 1218884d179dSJan Kara *warntype = QUOTA_NL_NOWARN; 1219268157baSJan Kara if (!sb_has_quota_limits_enabled(sb, dquot->dq_type) || 1220884d179dSJan Kara test_bit(DQ_FAKE_B, &dquot->dq_flags)) 1221884d179dSJan Kara return QUOTA_OK; 1222884d179dSJan Kara 1223884d179dSJan Kara tspace = dquot->dq_dqb.dqb_curspace + dquot->dq_dqb.dqb_rsvspace 1224884d179dSJan Kara + space; 1225884d179dSJan Kara 1226884d179dSJan Kara if (dquot->dq_dqb.dqb_bhardlimit && 1227884d179dSJan Kara tspace > dquot->dq_dqb.dqb_bhardlimit && 1228884d179dSJan Kara !ignore_hardlimit(dquot)) { 1229884d179dSJan Kara if (!prealloc) 1230884d179dSJan Kara *warntype = QUOTA_NL_BHARDWARN; 1231884d179dSJan Kara return NO_QUOTA; 1232884d179dSJan Kara } 1233884d179dSJan Kara 1234884d179dSJan Kara if (dquot->dq_dqb.dqb_bsoftlimit && 1235884d179dSJan Kara tspace > dquot->dq_dqb.dqb_bsoftlimit && 1236268157baSJan Kara dquot->dq_dqb.dqb_btime && 1237268157baSJan Kara get_seconds() >= dquot->dq_dqb.dqb_btime && 1238884d179dSJan Kara !ignore_hardlimit(dquot)) { 1239884d179dSJan Kara if (!prealloc) 1240884d179dSJan Kara *warntype = QUOTA_NL_BSOFTLONGWARN; 1241884d179dSJan Kara return NO_QUOTA; 1242884d179dSJan Kara } 1243884d179dSJan Kara 1244884d179dSJan Kara if (dquot->dq_dqb.dqb_bsoftlimit && 1245884d179dSJan Kara tspace > dquot->dq_dqb.dqb_bsoftlimit && 1246884d179dSJan Kara dquot->dq_dqb.dqb_btime == 0) { 1247884d179dSJan Kara if (!prealloc) { 1248884d179dSJan Kara *warntype = QUOTA_NL_BSOFTWARN; 1249268157baSJan Kara dquot->dq_dqb.dqb_btime = get_seconds() + 1250268157baSJan Kara sb_dqopt(sb)->info[dquot->dq_type].dqi_bgrace; 1251884d179dSJan Kara } 1252884d179dSJan Kara else 1253884d179dSJan Kara /* 1254884d179dSJan Kara * We don't allow preallocation to exceed softlimit so exceeding will 1255884d179dSJan Kara * be always printed 1256884d179dSJan Kara */ 1257884d179dSJan Kara return NO_QUOTA; 1258884d179dSJan Kara } 1259884d179dSJan Kara 1260884d179dSJan Kara return QUOTA_OK; 1261884d179dSJan Kara } 1262884d179dSJan Kara 1263884d179dSJan Kara static int info_idq_free(struct dquot *dquot, qsize_t inodes) 1264884d179dSJan Kara { 1265268157baSJan Kara qsize_t newinodes; 1266268157baSJan Kara 1267884d179dSJan Kara if (test_bit(DQ_FAKE_B, &dquot->dq_flags) || 1268884d179dSJan Kara dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit || 1269884d179dSJan Kara !sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_type)) 1270884d179dSJan Kara return QUOTA_NL_NOWARN; 1271884d179dSJan Kara 1272268157baSJan Kara newinodes = dquot->dq_dqb.dqb_curinodes - inodes; 1273268157baSJan Kara if (newinodes <= dquot->dq_dqb.dqb_isoftlimit) 1274884d179dSJan Kara return QUOTA_NL_ISOFTBELOW; 1275884d179dSJan Kara if (dquot->dq_dqb.dqb_curinodes >= dquot->dq_dqb.dqb_ihardlimit && 1276268157baSJan Kara newinodes < dquot->dq_dqb.dqb_ihardlimit) 1277884d179dSJan Kara return QUOTA_NL_IHARDBELOW; 1278884d179dSJan Kara return QUOTA_NL_NOWARN; 1279884d179dSJan Kara } 1280884d179dSJan Kara 1281884d179dSJan Kara static int info_bdq_free(struct dquot *dquot, qsize_t space) 1282884d179dSJan Kara { 1283884d179dSJan Kara if (test_bit(DQ_FAKE_B, &dquot->dq_flags) || 1284884d179dSJan Kara dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit) 1285884d179dSJan Kara return QUOTA_NL_NOWARN; 1286884d179dSJan Kara 1287884d179dSJan Kara if (dquot->dq_dqb.dqb_curspace - space <= dquot->dq_dqb.dqb_bsoftlimit) 1288884d179dSJan Kara return QUOTA_NL_BSOFTBELOW; 1289884d179dSJan Kara if (dquot->dq_dqb.dqb_curspace >= dquot->dq_dqb.dqb_bhardlimit && 1290884d179dSJan Kara dquot->dq_dqb.dqb_curspace - space < dquot->dq_dqb.dqb_bhardlimit) 1291884d179dSJan Kara return QUOTA_NL_BHARDBELOW; 1292884d179dSJan Kara return QUOTA_NL_NOWARN; 1293884d179dSJan Kara } 12940a5a9c72SJan Kara 1295884d179dSJan Kara /* 1296884d179dSJan Kara * Initialize quota pointers in inode 1297884d179dSJan Kara * We do things in a bit complicated way but by that we avoid calling 1298884d179dSJan Kara * dqget() and thus filesystem callbacks under dqptr_sem. 1299884d179dSJan Kara */ 1300884d179dSJan Kara int dquot_initialize(struct inode *inode, int type) 1301884d179dSJan Kara { 1302884d179dSJan Kara unsigned int id = 0; 1303884d179dSJan Kara int cnt, ret = 0; 1304dd6f3c6dSJan Kara struct dquot *got[MAXQUOTAS] = { NULL, NULL }; 1305884d179dSJan Kara struct super_block *sb = inode->i_sb; 13060a5a9c72SJan Kara qsize_t rsv; 1307884d179dSJan Kara 1308884d179dSJan Kara /* First test before acquiring mutex - solves deadlocks when we 1309884d179dSJan Kara * re-enter the quota code and are already holding the mutex */ 1310884d179dSJan Kara if (IS_NOQUOTA(inode)) 1311884d179dSJan Kara return 0; 1312884d179dSJan Kara 1313884d179dSJan Kara /* First get references to structures we might need. */ 1314884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1315884d179dSJan Kara if (type != -1 && cnt != type) 1316884d179dSJan Kara continue; 1317884d179dSJan Kara switch (cnt) { 1318884d179dSJan Kara case USRQUOTA: 1319884d179dSJan Kara id = inode->i_uid; 1320884d179dSJan Kara break; 1321884d179dSJan Kara case GRPQUOTA: 1322884d179dSJan Kara id = inode->i_gid; 1323884d179dSJan Kara break; 1324884d179dSJan Kara } 1325884d179dSJan Kara got[cnt] = dqget(sb, id, cnt); 1326884d179dSJan Kara } 1327884d179dSJan Kara 1328884d179dSJan Kara down_write(&sb_dqopt(sb)->dqptr_sem); 1329884d179dSJan Kara if (IS_NOQUOTA(inode)) 1330884d179dSJan Kara goto out_err; 1331884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1332884d179dSJan Kara if (type != -1 && cnt != type) 1333884d179dSJan Kara continue; 1334884d179dSJan Kara /* Avoid races with quotaoff() */ 1335884d179dSJan Kara if (!sb_has_quota_active(sb, cnt)) 1336884d179dSJan Kara continue; 1337dd6f3c6dSJan Kara if (!inode->i_dquot[cnt]) { 1338884d179dSJan Kara inode->i_dquot[cnt] = got[cnt]; 1339dd6f3c6dSJan Kara got[cnt] = NULL; 13400a5a9c72SJan Kara /* 13410a5a9c72SJan Kara * Make quota reservation system happy if someone 13420a5a9c72SJan Kara * did a write before quota was turned on 13430a5a9c72SJan Kara */ 13440a5a9c72SJan Kara rsv = inode_get_rsv_space(inode); 13450a5a9c72SJan Kara if (unlikely(rsv)) 13460a5a9c72SJan Kara dquot_resv_space(inode->i_dquot[cnt], rsv); 1347884d179dSJan Kara } 1348884d179dSJan Kara } 1349884d179dSJan Kara out_err: 1350884d179dSJan Kara up_write(&sb_dqopt(sb)->dqptr_sem); 1351884d179dSJan Kara /* Drop unused references */ 1352dc52dd3aSDmitry Monakhov dqput_all(got); 1353884d179dSJan Kara return ret; 1354884d179dSJan Kara } 1355884d179dSJan Kara EXPORT_SYMBOL(dquot_initialize); 1356884d179dSJan Kara 1357884d179dSJan Kara /* 1358884d179dSJan Kara * Release all quotas referenced by inode 1359884d179dSJan Kara */ 1360884d179dSJan Kara int dquot_drop(struct inode *inode) 1361884d179dSJan Kara { 1362884d179dSJan Kara int cnt; 1363884d179dSJan Kara struct dquot *put[MAXQUOTAS]; 1364884d179dSJan Kara 1365884d179dSJan Kara down_write(&sb_dqopt(inode->i_sb)->dqptr_sem); 1366884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1367884d179dSJan Kara put[cnt] = inode->i_dquot[cnt]; 1368dd6f3c6dSJan Kara inode->i_dquot[cnt] = NULL; 1369884d179dSJan Kara } 1370884d179dSJan Kara up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); 1371dc52dd3aSDmitry Monakhov dqput_all(put); 1372884d179dSJan Kara return 0; 1373884d179dSJan Kara } 1374884d179dSJan Kara EXPORT_SYMBOL(dquot_drop); 1375884d179dSJan Kara 1376884d179dSJan Kara /* Wrapper to remove references to quota structures from inode */ 1377884d179dSJan Kara void vfs_dq_drop(struct inode *inode) 1378884d179dSJan Kara { 1379884d179dSJan Kara /* Here we can get arbitrary inode from clear_inode() so we have 1380884d179dSJan Kara * to be careful. OTOH we don't need locking as quota operations 1381884d179dSJan Kara * are allowed to change only at mount time */ 1382884d179dSJan Kara if (!IS_NOQUOTA(inode) && inode->i_sb && inode->i_sb->dq_op 1383884d179dSJan Kara && inode->i_sb->dq_op->drop) { 1384884d179dSJan Kara int cnt; 1385884d179dSJan Kara /* Test before calling to rule out calls from proc and such 1386884d179dSJan Kara * where we are not allowed to block. Note that this is 1387884d179dSJan Kara * actually reliable test even without the lock - the caller 1388884d179dSJan Kara * must assure that nobody can come after the DQUOT_DROP and 1389884d179dSJan Kara * add quota pointers back anyway */ 1390884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 1391dd6f3c6dSJan Kara if (inode->i_dquot[cnt]) 1392884d179dSJan Kara break; 1393884d179dSJan Kara if (cnt < MAXQUOTAS) 1394884d179dSJan Kara inode->i_sb->dq_op->drop(inode); 1395884d179dSJan Kara } 1396884d179dSJan Kara } 1397884d179dSJan Kara EXPORT_SYMBOL(vfs_dq_drop); 1398884d179dSJan Kara 1399884d179dSJan Kara /* 1400fd8fbfc1SDmitry Monakhov * inode_reserved_space is managed internally by quota, and protected by 1401fd8fbfc1SDmitry Monakhov * i_lock similar to i_blocks+i_bytes. 1402fd8fbfc1SDmitry Monakhov */ 1403fd8fbfc1SDmitry Monakhov static qsize_t *inode_reserved_space(struct inode * inode) 1404fd8fbfc1SDmitry Monakhov { 1405fd8fbfc1SDmitry Monakhov /* Filesystem must explicitly define it's own method in order to use 1406fd8fbfc1SDmitry Monakhov * quota reservation interface */ 1407fd8fbfc1SDmitry Monakhov BUG_ON(!inode->i_sb->dq_op->get_reserved_space); 1408fd8fbfc1SDmitry Monakhov return inode->i_sb->dq_op->get_reserved_space(inode); 1409fd8fbfc1SDmitry Monakhov } 1410fd8fbfc1SDmitry Monakhov 1411c469070aSDmitry Monakhov void inode_add_rsv_space(struct inode *inode, qsize_t number) 1412fd8fbfc1SDmitry Monakhov { 1413fd8fbfc1SDmitry Monakhov spin_lock(&inode->i_lock); 1414fd8fbfc1SDmitry Monakhov *inode_reserved_space(inode) += number; 1415fd8fbfc1SDmitry Monakhov spin_unlock(&inode->i_lock); 1416fd8fbfc1SDmitry Monakhov } 1417c469070aSDmitry Monakhov EXPORT_SYMBOL(inode_add_rsv_space); 1418fd8fbfc1SDmitry Monakhov 1419c469070aSDmitry Monakhov void inode_claim_rsv_space(struct inode *inode, qsize_t number) 1420fd8fbfc1SDmitry Monakhov { 1421fd8fbfc1SDmitry Monakhov spin_lock(&inode->i_lock); 1422fd8fbfc1SDmitry Monakhov *inode_reserved_space(inode) -= number; 1423fd8fbfc1SDmitry Monakhov __inode_add_bytes(inode, number); 1424fd8fbfc1SDmitry Monakhov spin_unlock(&inode->i_lock); 1425fd8fbfc1SDmitry Monakhov } 1426c469070aSDmitry Monakhov EXPORT_SYMBOL(inode_claim_rsv_space); 1427fd8fbfc1SDmitry Monakhov 1428c469070aSDmitry Monakhov void inode_sub_rsv_space(struct inode *inode, qsize_t number) 1429fd8fbfc1SDmitry Monakhov { 1430fd8fbfc1SDmitry Monakhov spin_lock(&inode->i_lock); 1431fd8fbfc1SDmitry Monakhov *inode_reserved_space(inode) -= number; 1432fd8fbfc1SDmitry Monakhov spin_unlock(&inode->i_lock); 1433fd8fbfc1SDmitry Monakhov } 1434c469070aSDmitry Monakhov EXPORT_SYMBOL(inode_sub_rsv_space); 1435fd8fbfc1SDmitry Monakhov 1436fd8fbfc1SDmitry Monakhov static qsize_t inode_get_rsv_space(struct inode *inode) 1437fd8fbfc1SDmitry Monakhov { 1438fd8fbfc1SDmitry Monakhov qsize_t ret; 143905b5d898SJan Kara 144005b5d898SJan Kara if (!inode->i_sb->dq_op->get_reserved_space) 144105b5d898SJan Kara return 0; 1442fd8fbfc1SDmitry Monakhov spin_lock(&inode->i_lock); 1443fd8fbfc1SDmitry Monakhov ret = *inode_reserved_space(inode); 1444fd8fbfc1SDmitry Monakhov spin_unlock(&inode->i_lock); 1445fd8fbfc1SDmitry Monakhov return ret; 1446fd8fbfc1SDmitry Monakhov } 1447fd8fbfc1SDmitry Monakhov 1448fd8fbfc1SDmitry Monakhov static void inode_incr_space(struct inode *inode, qsize_t number, 1449fd8fbfc1SDmitry Monakhov int reserve) 1450fd8fbfc1SDmitry Monakhov { 1451fd8fbfc1SDmitry Monakhov if (reserve) 1452fd8fbfc1SDmitry Monakhov inode_add_rsv_space(inode, number); 1453fd8fbfc1SDmitry Monakhov else 1454fd8fbfc1SDmitry Monakhov inode_add_bytes(inode, number); 1455fd8fbfc1SDmitry Monakhov } 1456fd8fbfc1SDmitry Monakhov 1457fd8fbfc1SDmitry Monakhov static void inode_decr_space(struct inode *inode, qsize_t number, int reserve) 1458fd8fbfc1SDmitry Monakhov { 1459fd8fbfc1SDmitry Monakhov if (reserve) 1460fd8fbfc1SDmitry Monakhov inode_sub_rsv_space(inode, number); 1461fd8fbfc1SDmitry Monakhov else 1462fd8fbfc1SDmitry Monakhov inode_sub_bytes(inode, number); 1463fd8fbfc1SDmitry Monakhov } 1464fd8fbfc1SDmitry Monakhov 1465fd8fbfc1SDmitry Monakhov /* 1466884d179dSJan Kara * Following four functions update i_blocks+i_bytes fields and 1467884d179dSJan Kara * quota information (together with appropriate checks) 1468884d179dSJan Kara * NOTE: We absolutely rely on the fact that caller dirties 1469884d179dSJan Kara * the inode (usually macros in quotaops.h care about this) and 1470884d179dSJan Kara * holds a handle for the current transaction so that dquot write and 1471884d179dSJan Kara * inode write go into the same transaction. 1472884d179dSJan Kara */ 1473884d179dSJan Kara 1474884d179dSJan Kara /* 1475884d179dSJan Kara * This operation can block, but only after everything is updated 1476884d179dSJan Kara */ 1477884d179dSJan Kara int __dquot_alloc_space(struct inode *inode, qsize_t number, 1478884d179dSJan Kara int warn, int reserve) 1479884d179dSJan Kara { 1480884d179dSJan Kara int cnt, ret = QUOTA_OK; 1481884d179dSJan Kara char warntype[MAXQUOTAS]; 1482884d179dSJan Kara 1483fd8fbfc1SDmitry Monakhov /* 1484fd8fbfc1SDmitry Monakhov * First test before acquiring mutex - solves deadlocks when we 1485fd8fbfc1SDmitry Monakhov * re-enter the quota code and are already holding the mutex 1486fd8fbfc1SDmitry Monakhov */ 1487fd8fbfc1SDmitry Monakhov if (IS_NOQUOTA(inode)) { 1488fd8fbfc1SDmitry Monakhov inode_incr_space(inode, number, reserve); 1489fd8fbfc1SDmitry Monakhov goto out; 1490fd8fbfc1SDmitry Monakhov } 1491fd8fbfc1SDmitry Monakhov 1492fd8fbfc1SDmitry Monakhov down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1493884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 1494884d179dSJan Kara warntype[cnt] = QUOTA_NL_NOWARN; 1495884d179dSJan Kara 1496884d179dSJan Kara spin_lock(&dq_data_lock); 1497884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1498dd6f3c6dSJan Kara if (!inode->i_dquot[cnt]) 1499884d179dSJan Kara continue; 1500884d179dSJan Kara if (check_bdq(inode->i_dquot[cnt], number, warn, warntype+cnt) 1501884d179dSJan Kara == NO_QUOTA) { 1502884d179dSJan Kara ret = NO_QUOTA; 1503fd8fbfc1SDmitry Monakhov spin_unlock(&dq_data_lock); 1504fd8fbfc1SDmitry Monakhov goto out_flush_warn; 1505884d179dSJan Kara } 1506884d179dSJan Kara } 1507884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1508dd6f3c6dSJan Kara if (!inode->i_dquot[cnt]) 1509884d179dSJan Kara continue; 1510884d179dSJan Kara if (reserve) 1511884d179dSJan Kara dquot_resv_space(inode->i_dquot[cnt], number); 1512884d179dSJan Kara else 1513884d179dSJan Kara dquot_incr_space(inode->i_dquot[cnt], number); 1514884d179dSJan Kara } 1515fd8fbfc1SDmitry Monakhov inode_incr_space(inode, number, reserve); 1516884d179dSJan Kara spin_unlock(&dq_data_lock); 1517fd8fbfc1SDmitry Monakhov 1518fd8fbfc1SDmitry Monakhov if (reserve) 1519fd8fbfc1SDmitry Monakhov goto out_flush_warn; 1520dc52dd3aSDmitry Monakhov mark_all_dquot_dirty(inode->i_dquot); 1521fd8fbfc1SDmitry Monakhov out_flush_warn: 1522884d179dSJan Kara flush_warnings(inode->i_dquot, warntype); 1523fd8fbfc1SDmitry Monakhov up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1524fd8fbfc1SDmitry Monakhov out: 1525884d179dSJan Kara return ret; 1526884d179dSJan Kara } 1527884d179dSJan Kara 1528884d179dSJan Kara int dquot_alloc_space(struct inode *inode, qsize_t number, int warn) 1529884d179dSJan Kara { 1530fd8fbfc1SDmitry Monakhov return __dquot_alloc_space(inode, number, warn, 0); 1531884d179dSJan Kara } 1532884d179dSJan Kara EXPORT_SYMBOL(dquot_alloc_space); 1533884d179dSJan Kara 1534884d179dSJan Kara int dquot_reserve_space(struct inode *inode, qsize_t number, int warn) 1535884d179dSJan Kara { 1536fd8fbfc1SDmitry Monakhov return __dquot_alloc_space(inode, number, warn, 1); 1537884d179dSJan Kara } 1538884d179dSJan Kara EXPORT_SYMBOL(dquot_reserve_space); 1539884d179dSJan Kara 1540884d179dSJan Kara /* 1541884d179dSJan Kara * This operation can block, but only after everything is updated 1542884d179dSJan Kara */ 1543884d179dSJan Kara int dquot_alloc_inode(const struct inode *inode, qsize_t number) 1544884d179dSJan Kara { 1545884d179dSJan Kara int cnt, ret = NO_QUOTA; 1546884d179dSJan Kara char warntype[MAXQUOTAS]; 1547884d179dSJan Kara 1548884d179dSJan Kara /* First test before acquiring mutex - solves deadlocks when we 1549884d179dSJan Kara * re-enter the quota code and are already holding the mutex */ 1550884d179dSJan Kara if (IS_NOQUOTA(inode)) 1551884d179dSJan Kara return QUOTA_OK; 1552884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 1553884d179dSJan Kara warntype[cnt] = QUOTA_NL_NOWARN; 1554884d179dSJan Kara down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1555884d179dSJan Kara spin_lock(&dq_data_lock); 1556884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1557dd6f3c6dSJan Kara if (!inode->i_dquot[cnt]) 1558884d179dSJan Kara continue; 1559268157baSJan Kara if (check_idq(inode->i_dquot[cnt], number, warntype+cnt) 1560268157baSJan Kara == NO_QUOTA) 1561884d179dSJan Kara goto warn_put_all; 1562884d179dSJan Kara } 1563884d179dSJan Kara 1564884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1565dd6f3c6dSJan Kara if (!inode->i_dquot[cnt]) 1566884d179dSJan Kara continue; 1567884d179dSJan Kara dquot_incr_inodes(inode->i_dquot[cnt], number); 1568884d179dSJan Kara } 1569884d179dSJan Kara ret = QUOTA_OK; 1570884d179dSJan Kara warn_put_all: 1571884d179dSJan Kara spin_unlock(&dq_data_lock); 1572884d179dSJan Kara if (ret == QUOTA_OK) 1573dc52dd3aSDmitry Monakhov mark_all_dquot_dirty(inode->i_dquot); 1574884d179dSJan Kara flush_warnings(inode->i_dquot, warntype); 1575884d179dSJan Kara up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1576884d179dSJan Kara return ret; 1577884d179dSJan Kara } 1578884d179dSJan Kara EXPORT_SYMBOL(dquot_alloc_inode); 1579884d179dSJan Kara 1580884d179dSJan Kara int dquot_claim_space(struct inode *inode, qsize_t number) 1581884d179dSJan Kara { 1582884d179dSJan Kara int cnt; 1583884d179dSJan Kara int ret = QUOTA_OK; 1584884d179dSJan Kara 1585884d179dSJan Kara if (IS_NOQUOTA(inode)) { 1586fd8fbfc1SDmitry Monakhov inode_claim_rsv_space(inode, number); 1587884d179dSJan Kara goto out; 1588884d179dSJan Kara } 1589884d179dSJan Kara 1590884d179dSJan Kara down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1591884d179dSJan Kara spin_lock(&dq_data_lock); 1592884d179dSJan Kara /* Claim reserved quotas to allocated quotas */ 1593884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1594dd6f3c6dSJan Kara if (inode->i_dquot[cnt]) 1595884d179dSJan Kara dquot_claim_reserved_space(inode->i_dquot[cnt], 1596884d179dSJan Kara number); 1597884d179dSJan Kara } 1598884d179dSJan Kara /* Update inode bytes */ 1599fd8fbfc1SDmitry Monakhov inode_claim_rsv_space(inode, number); 1600884d179dSJan Kara spin_unlock(&dq_data_lock); 1601dc52dd3aSDmitry Monakhov mark_all_dquot_dirty(inode->i_dquot); 1602884d179dSJan Kara up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1603884d179dSJan Kara out: 1604884d179dSJan Kara return ret; 1605884d179dSJan Kara } 1606884d179dSJan Kara EXPORT_SYMBOL(dquot_claim_space); 1607884d179dSJan Kara 1608884d179dSJan Kara /* 1609884d179dSJan Kara * This operation can block, but only after everything is updated 1610884d179dSJan Kara */ 1611fd8fbfc1SDmitry Monakhov int __dquot_free_space(struct inode *inode, qsize_t number, int reserve) 1612884d179dSJan Kara { 1613884d179dSJan Kara unsigned int cnt; 1614884d179dSJan Kara char warntype[MAXQUOTAS]; 1615884d179dSJan Kara 1616884d179dSJan Kara /* First test before acquiring mutex - solves deadlocks when we 1617884d179dSJan Kara * re-enter the quota code and are already holding the mutex */ 1618884d179dSJan Kara if (IS_NOQUOTA(inode)) { 1619fd8fbfc1SDmitry Monakhov inode_decr_space(inode, number, reserve); 1620884d179dSJan Kara return QUOTA_OK; 1621884d179dSJan Kara } 1622884d179dSJan Kara 1623884d179dSJan Kara down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1624884d179dSJan Kara spin_lock(&dq_data_lock); 1625884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1626dd6f3c6dSJan Kara if (!inode->i_dquot[cnt]) 1627884d179dSJan Kara continue; 1628884d179dSJan Kara warntype[cnt] = info_bdq_free(inode->i_dquot[cnt], number); 1629fd8fbfc1SDmitry Monakhov if (reserve) 1630fd8fbfc1SDmitry Monakhov dquot_free_reserved_space(inode->i_dquot[cnt], number); 1631fd8fbfc1SDmitry Monakhov else 1632884d179dSJan Kara dquot_decr_space(inode->i_dquot[cnt], number); 1633884d179dSJan Kara } 1634fd8fbfc1SDmitry Monakhov inode_decr_space(inode, number, reserve); 1635884d179dSJan Kara spin_unlock(&dq_data_lock); 1636fd8fbfc1SDmitry Monakhov 1637fd8fbfc1SDmitry Monakhov if (reserve) 1638fd8fbfc1SDmitry Monakhov goto out_unlock; 1639dc52dd3aSDmitry Monakhov mark_all_dquot_dirty(inode->i_dquot); 1640fd8fbfc1SDmitry Monakhov out_unlock: 1641884d179dSJan Kara flush_warnings(inode->i_dquot, warntype); 1642884d179dSJan Kara up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1643884d179dSJan Kara return QUOTA_OK; 1644884d179dSJan Kara } 1645fd8fbfc1SDmitry Monakhov 1646fd8fbfc1SDmitry Monakhov int dquot_free_space(struct inode *inode, qsize_t number) 1647fd8fbfc1SDmitry Monakhov { 1648fd8fbfc1SDmitry Monakhov return __dquot_free_space(inode, number, 0); 1649fd8fbfc1SDmitry Monakhov } 1650884d179dSJan Kara EXPORT_SYMBOL(dquot_free_space); 1651884d179dSJan Kara 1652884d179dSJan Kara /* 1653fd8fbfc1SDmitry Monakhov * Release reserved quota space 1654fd8fbfc1SDmitry Monakhov */ 1655fd8fbfc1SDmitry Monakhov void dquot_release_reserved_space(struct inode *inode, qsize_t number) 1656fd8fbfc1SDmitry Monakhov { 1657fd8fbfc1SDmitry Monakhov __dquot_free_space(inode, number, 1); 1658fd8fbfc1SDmitry Monakhov 1659fd8fbfc1SDmitry Monakhov } 1660fd8fbfc1SDmitry Monakhov EXPORT_SYMBOL(dquot_release_reserved_space); 1661fd8fbfc1SDmitry Monakhov 1662fd8fbfc1SDmitry Monakhov /* 1663884d179dSJan Kara * This operation can block, but only after everything is updated 1664884d179dSJan Kara */ 1665884d179dSJan Kara int dquot_free_inode(const struct inode *inode, qsize_t number) 1666884d179dSJan Kara { 1667884d179dSJan Kara unsigned int cnt; 1668884d179dSJan Kara char warntype[MAXQUOTAS]; 1669884d179dSJan Kara 1670884d179dSJan Kara /* First test before acquiring mutex - solves deadlocks when we 1671884d179dSJan Kara * re-enter the quota code and are already holding the mutex */ 1672884d179dSJan Kara if (IS_NOQUOTA(inode)) 1673884d179dSJan Kara return QUOTA_OK; 1674884d179dSJan Kara 1675884d179dSJan Kara down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1676884d179dSJan Kara spin_lock(&dq_data_lock); 1677884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1678dd6f3c6dSJan Kara if (!inode->i_dquot[cnt]) 1679884d179dSJan Kara continue; 1680884d179dSJan Kara warntype[cnt] = info_idq_free(inode->i_dquot[cnt], number); 1681884d179dSJan Kara dquot_decr_inodes(inode->i_dquot[cnt], number); 1682884d179dSJan Kara } 1683884d179dSJan Kara spin_unlock(&dq_data_lock); 1684dc52dd3aSDmitry Monakhov mark_all_dquot_dirty(inode->i_dquot); 1685884d179dSJan Kara flush_warnings(inode->i_dquot, warntype); 1686884d179dSJan Kara up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1687884d179dSJan Kara return QUOTA_OK; 1688884d179dSJan Kara } 1689884d179dSJan Kara EXPORT_SYMBOL(dquot_free_inode); 1690884d179dSJan Kara 1691884d179dSJan Kara /* 1692884d179dSJan Kara * Transfer the number of inode and blocks from one diskquota to an other. 1693884d179dSJan Kara * 1694884d179dSJan Kara * This operation can block, but only after everything is updated 1695884d179dSJan Kara * A transaction must be started when entering this function. 1696884d179dSJan Kara */ 1697884d179dSJan Kara int dquot_transfer(struct inode *inode, struct iattr *iattr) 1698884d179dSJan Kara { 1699884d179dSJan Kara qsize_t space, cur_space; 1700884d179dSJan Kara qsize_t rsv_space = 0; 1701884d179dSJan Kara struct dquot *transfer_from[MAXQUOTAS]; 1702884d179dSJan Kara struct dquot *transfer_to[MAXQUOTAS]; 1703884d179dSJan Kara int cnt, ret = QUOTA_OK; 1704884d179dSJan Kara int chuid = iattr->ia_valid & ATTR_UID && inode->i_uid != iattr->ia_uid, 1705884d179dSJan Kara chgid = iattr->ia_valid & ATTR_GID && inode->i_gid != iattr->ia_gid; 1706884d179dSJan Kara char warntype_to[MAXQUOTAS]; 1707884d179dSJan Kara char warntype_from_inodes[MAXQUOTAS], warntype_from_space[MAXQUOTAS]; 1708884d179dSJan Kara 1709884d179dSJan Kara /* First test before acquiring mutex - solves deadlocks when we 1710884d179dSJan Kara * re-enter the quota code and are already holding the mutex */ 1711884d179dSJan Kara if (IS_NOQUOTA(inode)) 1712884d179dSJan Kara return QUOTA_OK; 1713884d179dSJan Kara /* Initialize the arrays */ 1714884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1715dd6f3c6dSJan Kara transfer_from[cnt] = NULL; 1716dd6f3c6dSJan Kara transfer_to[cnt] = NULL; 1717884d179dSJan Kara warntype_to[cnt] = QUOTA_NL_NOWARN; 1718884d179dSJan Kara } 1719268157baSJan Kara if (chuid) 1720268157baSJan Kara transfer_to[USRQUOTA] = dqget(inode->i_sb, iattr->ia_uid, 1721268157baSJan Kara USRQUOTA); 1722268157baSJan Kara if (chgid) 1723268157baSJan Kara transfer_to[GRPQUOTA] = dqget(inode->i_sb, iattr->ia_gid, 1724268157baSJan Kara GRPQUOTA); 1725884d179dSJan Kara 1726884d179dSJan Kara down_write(&sb_dqopt(inode->i_sb)->dqptr_sem); 1727884d179dSJan Kara if (IS_NOQUOTA(inode)) { /* File without quota accounting? */ 1728884d179dSJan Kara up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); 1729884d179dSJan Kara goto put_all; 1730884d179dSJan Kara } 1731884d179dSJan Kara spin_lock(&dq_data_lock); 1732884d179dSJan Kara cur_space = inode_get_bytes(inode); 1733fd8fbfc1SDmitry Monakhov rsv_space = inode_get_rsv_space(inode); 1734884d179dSJan Kara space = cur_space + rsv_space; 1735884d179dSJan Kara /* Build the transfer_from list and check the limits */ 1736884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1737dd6f3c6dSJan Kara if (!transfer_to[cnt]) 1738884d179dSJan Kara continue; 1739884d179dSJan Kara transfer_from[cnt] = inode->i_dquot[cnt]; 1740884d179dSJan Kara if (check_idq(transfer_to[cnt], 1, warntype_to + cnt) == 1741884d179dSJan Kara NO_QUOTA || check_bdq(transfer_to[cnt], space, 0, 1742884d179dSJan Kara warntype_to + cnt) == NO_QUOTA) 1743884d179dSJan Kara goto over_quota; 1744884d179dSJan Kara } 1745884d179dSJan Kara 1746884d179dSJan Kara /* 1747884d179dSJan Kara * Finally perform the needed transfer from transfer_from to transfer_to 1748884d179dSJan Kara */ 1749884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1750884d179dSJan Kara /* 1751884d179dSJan Kara * Skip changes for same uid or gid or for turned off quota-type. 1752884d179dSJan Kara */ 1753dd6f3c6dSJan Kara if (!transfer_to[cnt]) 1754884d179dSJan Kara continue; 1755884d179dSJan Kara 1756884d179dSJan Kara /* Due to IO error we might not have transfer_from[] structure */ 1757884d179dSJan Kara if (transfer_from[cnt]) { 1758884d179dSJan Kara warntype_from_inodes[cnt] = 1759884d179dSJan Kara info_idq_free(transfer_from[cnt], 1); 1760884d179dSJan Kara warntype_from_space[cnt] = 1761884d179dSJan Kara info_bdq_free(transfer_from[cnt], space); 1762884d179dSJan Kara dquot_decr_inodes(transfer_from[cnt], 1); 1763884d179dSJan Kara dquot_decr_space(transfer_from[cnt], cur_space); 1764884d179dSJan Kara dquot_free_reserved_space(transfer_from[cnt], 1765884d179dSJan Kara rsv_space); 1766884d179dSJan Kara } 1767884d179dSJan Kara 1768884d179dSJan Kara dquot_incr_inodes(transfer_to[cnt], 1); 1769884d179dSJan Kara dquot_incr_space(transfer_to[cnt], cur_space); 1770884d179dSJan Kara dquot_resv_space(transfer_to[cnt], rsv_space); 1771884d179dSJan Kara 1772884d179dSJan Kara inode->i_dquot[cnt] = transfer_to[cnt]; 1773884d179dSJan Kara } 1774884d179dSJan Kara spin_unlock(&dq_data_lock); 1775884d179dSJan Kara up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); 1776884d179dSJan Kara 1777dc52dd3aSDmitry Monakhov mark_all_dquot_dirty(transfer_from); 1778dc52dd3aSDmitry Monakhov mark_all_dquot_dirty(transfer_to); 1779884d179dSJan Kara /* The reference we got is transferred to the inode */ 1780dc52dd3aSDmitry Monakhov for (cnt = 0; cnt < MAXQUOTAS; cnt++) 1781dd6f3c6dSJan Kara transfer_to[cnt] = NULL; 1782884d179dSJan Kara warn_put_all: 1783884d179dSJan Kara flush_warnings(transfer_to, warntype_to); 1784884d179dSJan Kara flush_warnings(transfer_from, warntype_from_inodes); 1785884d179dSJan Kara flush_warnings(transfer_from, warntype_from_space); 1786884d179dSJan Kara put_all: 1787dc52dd3aSDmitry Monakhov dqput_all(transfer_from); 1788dc52dd3aSDmitry Monakhov dqput_all(transfer_to); 1789884d179dSJan Kara return ret; 1790884d179dSJan Kara over_quota: 1791884d179dSJan Kara spin_unlock(&dq_data_lock); 1792884d179dSJan Kara up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); 1793884d179dSJan Kara /* Clear dquot pointers we don't want to dqput() */ 1794884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 1795dd6f3c6dSJan Kara transfer_from[cnt] = NULL; 1796884d179dSJan Kara ret = NO_QUOTA; 1797884d179dSJan Kara goto warn_put_all; 1798884d179dSJan Kara } 1799884d179dSJan Kara EXPORT_SYMBOL(dquot_transfer); 1800884d179dSJan Kara 1801884d179dSJan Kara /* Wrapper for transferring ownership of an inode */ 1802884d179dSJan Kara int vfs_dq_transfer(struct inode *inode, struct iattr *iattr) 1803884d179dSJan Kara { 1804884d179dSJan Kara if (sb_any_quota_active(inode->i_sb) && !IS_NOQUOTA(inode)) { 1805884d179dSJan Kara vfs_dq_init(inode); 1806884d179dSJan Kara if (inode->i_sb->dq_op->transfer(inode, iattr) == NO_QUOTA) 1807884d179dSJan Kara return 1; 1808884d179dSJan Kara } 1809884d179dSJan Kara return 0; 1810884d179dSJan Kara } 1811884d179dSJan Kara EXPORT_SYMBOL(vfs_dq_transfer); 1812884d179dSJan Kara 1813884d179dSJan Kara /* 1814884d179dSJan Kara * Write info of quota file to disk 1815884d179dSJan Kara */ 1816884d179dSJan Kara int dquot_commit_info(struct super_block *sb, int type) 1817884d179dSJan Kara { 1818884d179dSJan Kara int ret; 1819884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 1820884d179dSJan Kara 1821884d179dSJan Kara mutex_lock(&dqopt->dqio_mutex); 1822884d179dSJan Kara ret = dqopt->ops[type]->write_file_info(sb, type); 1823884d179dSJan Kara mutex_unlock(&dqopt->dqio_mutex); 1824884d179dSJan Kara return ret; 1825884d179dSJan Kara } 1826884d179dSJan Kara EXPORT_SYMBOL(dquot_commit_info); 1827884d179dSJan Kara 1828884d179dSJan Kara /* 1829884d179dSJan Kara * Definitions of diskquota operations. 1830884d179dSJan Kara */ 183161e225dcSAlexey Dobriyan const struct dquot_operations dquot_operations = { 1832884d179dSJan Kara .initialize = dquot_initialize, 1833884d179dSJan Kara .drop = dquot_drop, 1834884d179dSJan Kara .alloc_space = dquot_alloc_space, 1835884d179dSJan Kara .alloc_inode = dquot_alloc_inode, 1836884d179dSJan Kara .free_space = dquot_free_space, 1837884d179dSJan Kara .free_inode = dquot_free_inode, 1838884d179dSJan Kara .transfer = dquot_transfer, 1839884d179dSJan Kara .write_dquot = dquot_commit, 1840884d179dSJan Kara .acquire_dquot = dquot_acquire, 1841884d179dSJan Kara .release_dquot = dquot_release, 1842884d179dSJan Kara .mark_dirty = dquot_mark_dquot_dirty, 1843884d179dSJan Kara .write_info = dquot_commit_info, 1844884d179dSJan Kara .alloc_dquot = dquot_alloc, 1845884d179dSJan Kara .destroy_dquot = dquot_destroy, 1846884d179dSJan Kara }; 1847884d179dSJan Kara 1848884d179dSJan Kara /* 1849884d179dSJan Kara * Turn quota off on a device. type == -1 ==> quotaoff for all types (umount) 1850884d179dSJan Kara */ 1851884d179dSJan Kara int vfs_quota_disable(struct super_block *sb, int type, unsigned int flags) 1852884d179dSJan Kara { 1853884d179dSJan Kara int cnt, ret = 0; 1854884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 1855884d179dSJan Kara struct inode *toputinode[MAXQUOTAS]; 1856884d179dSJan Kara 1857884d179dSJan Kara /* Cannot turn off usage accounting without turning off limits, or 1858884d179dSJan Kara * suspend quotas and simultaneously turn quotas off. */ 1859884d179dSJan Kara if ((flags & DQUOT_USAGE_ENABLED && !(flags & DQUOT_LIMITS_ENABLED)) 1860884d179dSJan Kara || (flags & DQUOT_SUSPENDED && flags & (DQUOT_LIMITS_ENABLED | 1861884d179dSJan Kara DQUOT_USAGE_ENABLED))) 1862884d179dSJan Kara return -EINVAL; 1863884d179dSJan Kara 1864884d179dSJan Kara /* We need to serialize quota_off() for device */ 1865884d179dSJan Kara mutex_lock(&dqopt->dqonoff_mutex); 1866884d179dSJan Kara 1867884d179dSJan Kara /* 1868884d179dSJan Kara * Skip everything if there's nothing to do. We have to do this because 1869884d179dSJan Kara * sometimes we are called when fill_super() failed and calling 1870884d179dSJan Kara * sync_fs() in such cases does no good. 1871884d179dSJan Kara */ 1872884d179dSJan Kara if (!sb_any_quota_loaded(sb)) { 1873884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 1874884d179dSJan Kara return 0; 1875884d179dSJan Kara } 1876884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1877884d179dSJan Kara toputinode[cnt] = NULL; 1878884d179dSJan Kara if (type != -1 && cnt != type) 1879884d179dSJan Kara continue; 1880884d179dSJan Kara if (!sb_has_quota_loaded(sb, cnt)) 1881884d179dSJan Kara continue; 1882884d179dSJan Kara 1883884d179dSJan Kara if (flags & DQUOT_SUSPENDED) { 1884884d179dSJan Kara spin_lock(&dq_state_lock); 1885884d179dSJan Kara dqopt->flags |= 1886884d179dSJan Kara dquot_state_flag(DQUOT_SUSPENDED, cnt); 1887884d179dSJan Kara spin_unlock(&dq_state_lock); 1888884d179dSJan Kara } else { 1889884d179dSJan Kara spin_lock(&dq_state_lock); 1890884d179dSJan Kara dqopt->flags &= ~dquot_state_flag(flags, cnt); 1891884d179dSJan Kara /* Turning off suspended quotas? */ 1892884d179dSJan Kara if (!sb_has_quota_loaded(sb, cnt) && 1893884d179dSJan Kara sb_has_quota_suspended(sb, cnt)) { 1894884d179dSJan Kara dqopt->flags &= ~dquot_state_flag( 1895884d179dSJan Kara DQUOT_SUSPENDED, cnt); 1896884d179dSJan Kara spin_unlock(&dq_state_lock); 1897884d179dSJan Kara iput(dqopt->files[cnt]); 1898884d179dSJan Kara dqopt->files[cnt] = NULL; 1899884d179dSJan Kara continue; 1900884d179dSJan Kara } 1901884d179dSJan Kara spin_unlock(&dq_state_lock); 1902884d179dSJan Kara } 1903884d179dSJan Kara 1904884d179dSJan Kara /* We still have to keep quota loaded? */ 1905884d179dSJan Kara if (sb_has_quota_loaded(sb, cnt) && !(flags & DQUOT_SUSPENDED)) 1906884d179dSJan Kara continue; 1907884d179dSJan Kara 1908884d179dSJan Kara /* Note: these are blocking operations */ 1909884d179dSJan Kara drop_dquot_ref(sb, cnt); 1910884d179dSJan Kara invalidate_dquots(sb, cnt); 1911884d179dSJan Kara /* 1912268157baSJan Kara * Now all dquots should be invalidated, all writes done so we 1913268157baSJan Kara * should be only users of the info. No locks needed. 1914884d179dSJan Kara */ 1915884d179dSJan Kara if (info_dirty(&dqopt->info[cnt])) 1916884d179dSJan Kara sb->dq_op->write_info(sb, cnt); 1917884d179dSJan Kara if (dqopt->ops[cnt]->free_file_info) 1918884d179dSJan Kara dqopt->ops[cnt]->free_file_info(sb, cnt); 1919884d179dSJan Kara put_quota_format(dqopt->info[cnt].dqi_format); 1920884d179dSJan Kara 1921884d179dSJan Kara toputinode[cnt] = dqopt->files[cnt]; 1922884d179dSJan Kara if (!sb_has_quota_loaded(sb, cnt)) 1923884d179dSJan Kara dqopt->files[cnt] = NULL; 1924884d179dSJan Kara dqopt->info[cnt].dqi_flags = 0; 1925884d179dSJan Kara dqopt->info[cnt].dqi_igrace = 0; 1926884d179dSJan Kara dqopt->info[cnt].dqi_bgrace = 0; 1927884d179dSJan Kara dqopt->ops[cnt] = NULL; 1928884d179dSJan Kara } 1929884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 1930884d179dSJan Kara 1931884d179dSJan Kara /* Skip syncing and setting flags if quota files are hidden */ 1932884d179dSJan Kara if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) 1933884d179dSJan Kara goto put_inodes; 1934884d179dSJan Kara 1935884d179dSJan Kara /* Sync the superblock so that buffers with quota data are written to 1936884d179dSJan Kara * disk (and so userspace sees correct data afterwards). */ 1937884d179dSJan Kara if (sb->s_op->sync_fs) 1938884d179dSJan Kara sb->s_op->sync_fs(sb, 1); 1939884d179dSJan Kara sync_blockdev(sb->s_bdev); 1940884d179dSJan Kara /* Now the quota files are just ordinary files and we can set the 1941884d179dSJan Kara * inode flags back. Moreover we discard the pagecache so that 1942884d179dSJan Kara * userspace sees the writes we did bypassing the pagecache. We 1943884d179dSJan Kara * must also discard the blockdev buffers so that we see the 1944884d179dSJan Kara * changes done by userspace on the next quotaon() */ 1945884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 1946884d179dSJan Kara if (toputinode[cnt]) { 1947884d179dSJan Kara mutex_lock(&dqopt->dqonoff_mutex); 1948884d179dSJan Kara /* If quota was reenabled in the meantime, we have 1949884d179dSJan Kara * nothing to do */ 1950884d179dSJan Kara if (!sb_has_quota_loaded(sb, cnt)) { 1951268157baSJan Kara mutex_lock_nested(&toputinode[cnt]->i_mutex, 1952268157baSJan Kara I_MUTEX_QUOTA); 1953884d179dSJan Kara toputinode[cnt]->i_flags &= ~(S_IMMUTABLE | 1954884d179dSJan Kara S_NOATIME | S_NOQUOTA); 1955268157baSJan Kara truncate_inode_pages(&toputinode[cnt]->i_data, 1956268157baSJan Kara 0); 1957884d179dSJan Kara mutex_unlock(&toputinode[cnt]->i_mutex); 1958884d179dSJan Kara mark_inode_dirty(toputinode[cnt]); 1959884d179dSJan Kara } 1960884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 1961884d179dSJan Kara } 1962884d179dSJan Kara if (sb->s_bdev) 1963884d179dSJan Kara invalidate_bdev(sb->s_bdev); 1964884d179dSJan Kara put_inodes: 1965884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 1966884d179dSJan Kara if (toputinode[cnt]) { 1967884d179dSJan Kara /* On remount RO, we keep the inode pointer so that we 1968884d179dSJan Kara * can reenable quota on the subsequent remount RW. We 1969884d179dSJan Kara * have to check 'flags' variable and not use sb_has_ 1970884d179dSJan Kara * function because another quotaon / quotaoff could 1971884d179dSJan Kara * change global state before we got here. We refuse 1972884d179dSJan Kara * to suspend quotas when there is pending delete on 1973884d179dSJan Kara * the quota file... */ 1974884d179dSJan Kara if (!(flags & DQUOT_SUSPENDED)) 1975884d179dSJan Kara iput(toputinode[cnt]); 1976884d179dSJan Kara else if (!toputinode[cnt]->i_nlink) 1977884d179dSJan Kara ret = -EBUSY; 1978884d179dSJan Kara } 1979884d179dSJan Kara return ret; 1980884d179dSJan Kara } 1981884d179dSJan Kara EXPORT_SYMBOL(vfs_quota_disable); 1982884d179dSJan Kara 1983884d179dSJan Kara int vfs_quota_off(struct super_block *sb, int type, int remount) 1984884d179dSJan Kara { 1985884d179dSJan Kara return vfs_quota_disable(sb, type, remount ? DQUOT_SUSPENDED : 1986884d179dSJan Kara (DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED)); 1987884d179dSJan Kara } 1988884d179dSJan Kara EXPORT_SYMBOL(vfs_quota_off); 1989884d179dSJan Kara /* 1990884d179dSJan Kara * Turn quotas on on a device 1991884d179dSJan Kara */ 1992884d179dSJan Kara 1993884d179dSJan Kara /* 1994884d179dSJan Kara * Helper function to turn quotas on when we already have the inode of 1995884d179dSJan Kara * quota file and no quota information is loaded. 1996884d179dSJan Kara */ 1997884d179dSJan Kara static int vfs_load_quota_inode(struct inode *inode, int type, int format_id, 1998884d179dSJan Kara unsigned int flags) 1999884d179dSJan Kara { 2000884d179dSJan Kara struct quota_format_type *fmt = find_quota_format(format_id); 2001884d179dSJan Kara struct super_block *sb = inode->i_sb; 2002884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 2003884d179dSJan Kara int error; 2004884d179dSJan Kara int oldflags = -1; 2005884d179dSJan Kara 2006884d179dSJan Kara if (!fmt) 2007884d179dSJan Kara return -ESRCH; 2008884d179dSJan Kara if (!S_ISREG(inode->i_mode)) { 2009884d179dSJan Kara error = -EACCES; 2010884d179dSJan Kara goto out_fmt; 2011884d179dSJan Kara } 2012884d179dSJan Kara if (IS_RDONLY(inode)) { 2013884d179dSJan Kara error = -EROFS; 2014884d179dSJan Kara goto out_fmt; 2015884d179dSJan Kara } 2016884d179dSJan Kara if (!sb->s_op->quota_write || !sb->s_op->quota_read) { 2017884d179dSJan Kara error = -EINVAL; 2018884d179dSJan Kara goto out_fmt; 2019884d179dSJan Kara } 2020884d179dSJan Kara /* Usage always has to be set... */ 2021884d179dSJan Kara if (!(flags & DQUOT_USAGE_ENABLED)) { 2022884d179dSJan Kara error = -EINVAL; 2023884d179dSJan Kara goto out_fmt; 2024884d179dSJan Kara } 2025884d179dSJan Kara 2026884d179dSJan Kara if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) { 2027884d179dSJan Kara /* As we bypass the pagecache we must now flush the inode so 2028884d179dSJan Kara * that we see all the changes from userspace... */ 2029884d179dSJan Kara write_inode_now(inode, 1); 2030884d179dSJan Kara /* And now flush the block cache so that kernel sees the 2031884d179dSJan Kara * changes */ 2032884d179dSJan Kara invalidate_bdev(sb->s_bdev); 2033884d179dSJan Kara } 2034884d179dSJan Kara mutex_lock(&dqopt->dqonoff_mutex); 2035884d179dSJan Kara if (sb_has_quota_loaded(sb, type)) { 2036884d179dSJan Kara error = -EBUSY; 2037884d179dSJan Kara goto out_lock; 2038884d179dSJan Kara } 2039884d179dSJan Kara 2040884d179dSJan Kara if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) { 2041884d179dSJan Kara /* We don't want quota and atime on quota files (deadlocks 2042884d179dSJan Kara * possible) Also nobody should write to the file - we use 2043884d179dSJan Kara * special IO operations which ignore the immutable bit. */ 2044dee86565SJan Kara mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA); 2045268157baSJan Kara oldflags = inode->i_flags & (S_NOATIME | S_IMMUTABLE | 2046268157baSJan Kara S_NOQUOTA); 2047884d179dSJan Kara inode->i_flags |= S_NOQUOTA | S_NOATIME | S_IMMUTABLE; 2048dee86565SJan Kara mutex_unlock(&inode->i_mutex); 204926245c94SJan Kara /* 205026245c94SJan Kara * When S_NOQUOTA is set, remove dquot references as no more 205126245c94SJan Kara * references can be added 205226245c94SJan Kara */ 2053884d179dSJan Kara sb->dq_op->drop(inode); 2054884d179dSJan Kara } 2055884d179dSJan Kara 2056884d179dSJan Kara error = -EIO; 2057884d179dSJan Kara dqopt->files[type] = igrab(inode); 2058884d179dSJan Kara if (!dqopt->files[type]) 2059884d179dSJan Kara goto out_lock; 2060884d179dSJan Kara error = -EINVAL; 2061884d179dSJan Kara if (!fmt->qf_ops->check_quota_file(sb, type)) 2062884d179dSJan Kara goto out_file_init; 2063884d179dSJan Kara 2064884d179dSJan Kara dqopt->ops[type] = fmt->qf_ops; 2065884d179dSJan Kara dqopt->info[type].dqi_format = fmt; 2066884d179dSJan Kara dqopt->info[type].dqi_fmt_id = format_id; 2067884d179dSJan Kara INIT_LIST_HEAD(&dqopt->info[type].dqi_dirty_list); 2068884d179dSJan Kara mutex_lock(&dqopt->dqio_mutex); 2069268157baSJan Kara error = dqopt->ops[type]->read_file_info(sb, type); 2070268157baSJan Kara if (error < 0) { 2071884d179dSJan Kara mutex_unlock(&dqopt->dqio_mutex); 2072884d179dSJan Kara goto out_file_init; 2073884d179dSJan Kara } 2074884d179dSJan Kara mutex_unlock(&dqopt->dqio_mutex); 2075884d179dSJan Kara spin_lock(&dq_state_lock); 2076884d179dSJan Kara dqopt->flags |= dquot_state_flag(flags, type); 2077884d179dSJan Kara spin_unlock(&dq_state_lock); 2078884d179dSJan Kara 2079884d179dSJan Kara add_dquot_ref(sb, type); 2080884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 2081884d179dSJan Kara 2082884d179dSJan Kara return 0; 2083884d179dSJan Kara 2084884d179dSJan Kara out_file_init: 2085884d179dSJan Kara dqopt->files[type] = NULL; 2086884d179dSJan Kara iput(inode); 2087884d179dSJan Kara out_lock: 2088884d179dSJan Kara if (oldflags != -1) { 2089dee86565SJan Kara mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA); 2090884d179dSJan Kara /* Set the flags back (in the case of accidental quotaon() 2091884d179dSJan Kara * on a wrong file we don't want to mess up the flags) */ 2092884d179dSJan Kara inode->i_flags &= ~(S_NOATIME | S_NOQUOTA | S_IMMUTABLE); 2093884d179dSJan Kara inode->i_flags |= oldflags; 2094dee86565SJan Kara mutex_unlock(&inode->i_mutex); 2095884d179dSJan Kara } 2096d01730d7SJiaying Zhang mutex_unlock(&dqopt->dqonoff_mutex); 2097884d179dSJan Kara out_fmt: 2098884d179dSJan Kara put_quota_format(fmt); 2099884d179dSJan Kara 2100884d179dSJan Kara return error; 2101884d179dSJan Kara } 2102884d179dSJan Kara 2103884d179dSJan Kara /* Reenable quotas on remount RW */ 2104884d179dSJan Kara static int vfs_quota_on_remount(struct super_block *sb, int type) 2105884d179dSJan Kara { 2106884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 2107884d179dSJan Kara struct inode *inode; 2108884d179dSJan Kara int ret; 2109884d179dSJan Kara unsigned int flags; 2110884d179dSJan Kara 2111884d179dSJan Kara mutex_lock(&dqopt->dqonoff_mutex); 2112884d179dSJan Kara if (!sb_has_quota_suspended(sb, type)) { 2113884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 2114884d179dSJan Kara return 0; 2115884d179dSJan Kara } 2116884d179dSJan Kara inode = dqopt->files[type]; 2117884d179dSJan Kara dqopt->files[type] = NULL; 2118884d179dSJan Kara spin_lock(&dq_state_lock); 2119884d179dSJan Kara flags = dqopt->flags & dquot_state_flag(DQUOT_USAGE_ENABLED | 2120884d179dSJan Kara DQUOT_LIMITS_ENABLED, type); 2121884d179dSJan Kara dqopt->flags &= ~dquot_state_flag(DQUOT_STATE_FLAGS, type); 2122884d179dSJan Kara spin_unlock(&dq_state_lock); 2123884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 2124884d179dSJan Kara 2125884d179dSJan Kara flags = dquot_generic_flag(flags, type); 2126884d179dSJan Kara ret = vfs_load_quota_inode(inode, type, dqopt->info[type].dqi_fmt_id, 2127884d179dSJan Kara flags); 2128884d179dSJan Kara iput(inode); 2129884d179dSJan Kara 2130884d179dSJan Kara return ret; 2131884d179dSJan Kara } 2132884d179dSJan Kara 2133884d179dSJan Kara int vfs_quota_on_path(struct super_block *sb, int type, int format_id, 2134884d179dSJan Kara struct path *path) 2135884d179dSJan Kara { 2136884d179dSJan Kara int error = security_quota_on(path->dentry); 2137884d179dSJan Kara if (error) 2138884d179dSJan Kara return error; 2139884d179dSJan Kara /* Quota file not on the same filesystem? */ 2140884d179dSJan Kara if (path->mnt->mnt_sb != sb) 2141884d179dSJan Kara error = -EXDEV; 2142884d179dSJan Kara else 2143884d179dSJan Kara error = vfs_load_quota_inode(path->dentry->d_inode, type, 2144884d179dSJan Kara format_id, DQUOT_USAGE_ENABLED | 2145884d179dSJan Kara DQUOT_LIMITS_ENABLED); 2146884d179dSJan Kara return error; 2147884d179dSJan Kara } 2148884d179dSJan Kara EXPORT_SYMBOL(vfs_quota_on_path); 2149884d179dSJan Kara 2150884d179dSJan Kara int vfs_quota_on(struct super_block *sb, int type, int format_id, char *name, 2151884d179dSJan Kara int remount) 2152884d179dSJan Kara { 2153884d179dSJan Kara struct path path; 2154884d179dSJan Kara int error; 2155884d179dSJan Kara 2156884d179dSJan Kara if (remount) 2157884d179dSJan Kara return vfs_quota_on_remount(sb, type); 2158884d179dSJan Kara 2159884d179dSJan Kara error = kern_path(name, LOOKUP_FOLLOW, &path); 2160884d179dSJan Kara if (!error) { 2161884d179dSJan Kara error = vfs_quota_on_path(sb, type, format_id, &path); 2162884d179dSJan Kara path_put(&path); 2163884d179dSJan Kara } 2164884d179dSJan Kara return error; 2165884d179dSJan Kara } 2166884d179dSJan Kara EXPORT_SYMBOL(vfs_quota_on); 2167884d179dSJan Kara 2168884d179dSJan Kara /* 2169884d179dSJan Kara * More powerful function for turning on quotas allowing setting 2170884d179dSJan Kara * of individual quota flags 2171884d179dSJan Kara */ 2172884d179dSJan Kara int vfs_quota_enable(struct inode *inode, int type, int format_id, 2173884d179dSJan Kara unsigned int flags) 2174884d179dSJan Kara { 2175884d179dSJan Kara int ret = 0; 2176884d179dSJan Kara struct super_block *sb = inode->i_sb; 2177884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 2178884d179dSJan Kara 2179884d179dSJan Kara /* Just unsuspend quotas? */ 2180884d179dSJan Kara if (flags & DQUOT_SUSPENDED) 2181884d179dSJan Kara return vfs_quota_on_remount(sb, type); 2182884d179dSJan Kara if (!flags) 2183884d179dSJan Kara return 0; 2184884d179dSJan Kara /* Just updating flags needed? */ 2185884d179dSJan Kara if (sb_has_quota_loaded(sb, type)) { 2186884d179dSJan Kara mutex_lock(&dqopt->dqonoff_mutex); 2187884d179dSJan Kara /* Now do a reliable test... */ 2188884d179dSJan Kara if (!sb_has_quota_loaded(sb, type)) { 2189884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 2190884d179dSJan Kara goto load_quota; 2191884d179dSJan Kara } 2192884d179dSJan Kara if (flags & DQUOT_USAGE_ENABLED && 2193884d179dSJan Kara sb_has_quota_usage_enabled(sb, type)) { 2194884d179dSJan Kara ret = -EBUSY; 2195884d179dSJan Kara goto out_lock; 2196884d179dSJan Kara } 2197884d179dSJan Kara if (flags & DQUOT_LIMITS_ENABLED && 2198884d179dSJan Kara sb_has_quota_limits_enabled(sb, type)) { 2199884d179dSJan Kara ret = -EBUSY; 2200884d179dSJan Kara goto out_lock; 2201884d179dSJan Kara } 2202884d179dSJan Kara spin_lock(&dq_state_lock); 2203884d179dSJan Kara sb_dqopt(sb)->flags |= dquot_state_flag(flags, type); 2204884d179dSJan Kara spin_unlock(&dq_state_lock); 2205884d179dSJan Kara out_lock: 2206884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 2207884d179dSJan Kara return ret; 2208884d179dSJan Kara } 2209884d179dSJan Kara 2210884d179dSJan Kara load_quota: 2211884d179dSJan Kara return vfs_load_quota_inode(inode, type, format_id, flags); 2212884d179dSJan Kara } 2213884d179dSJan Kara EXPORT_SYMBOL(vfs_quota_enable); 2214884d179dSJan Kara 2215884d179dSJan Kara /* 2216884d179dSJan Kara * This function is used when filesystem needs to initialize quotas 2217884d179dSJan Kara * during mount time. 2218884d179dSJan Kara */ 2219884d179dSJan Kara int vfs_quota_on_mount(struct super_block *sb, char *qf_name, 2220884d179dSJan Kara int format_id, int type) 2221884d179dSJan Kara { 2222884d179dSJan Kara struct dentry *dentry; 2223884d179dSJan Kara int error; 2224884d179dSJan Kara 2225c56818d7SJan Kara mutex_lock(&sb->s_root->d_inode->i_mutex); 2226884d179dSJan Kara dentry = lookup_one_len(qf_name, sb->s_root, strlen(qf_name)); 2227c56818d7SJan Kara mutex_unlock(&sb->s_root->d_inode->i_mutex); 2228884d179dSJan Kara if (IS_ERR(dentry)) 2229884d179dSJan Kara return PTR_ERR(dentry); 2230884d179dSJan Kara 2231884d179dSJan Kara if (!dentry->d_inode) { 2232884d179dSJan Kara error = -ENOENT; 2233884d179dSJan Kara goto out; 2234884d179dSJan Kara } 2235884d179dSJan Kara 2236884d179dSJan Kara error = security_quota_on(dentry); 2237884d179dSJan Kara if (!error) 2238884d179dSJan Kara error = vfs_load_quota_inode(dentry->d_inode, type, format_id, 2239884d179dSJan Kara DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); 2240884d179dSJan Kara 2241884d179dSJan Kara out: 2242884d179dSJan Kara dput(dentry); 2243884d179dSJan Kara return error; 2244884d179dSJan Kara } 2245884d179dSJan Kara EXPORT_SYMBOL(vfs_quota_on_mount); 2246884d179dSJan Kara 2247884d179dSJan Kara /* Wrapper to turn on quotas when remounting rw */ 2248884d179dSJan Kara int vfs_dq_quota_on_remount(struct super_block *sb) 2249884d179dSJan Kara { 2250884d179dSJan Kara int cnt; 2251884d179dSJan Kara int ret = 0, err; 2252884d179dSJan Kara 2253884d179dSJan Kara if (!sb->s_qcop || !sb->s_qcop->quota_on) 2254884d179dSJan Kara return -ENOSYS; 2255884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 2256884d179dSJan Kara err = sb->s_qcop->quota_on(sb, cnt, 0, NULL, 1); 2257884d179dSJan Kara if (err < 0 && !ret) 2258884d179dSJan Kara ret = err; 2259884d179dSJan Kara } 2260884d179dSJan Kara return ret; 2261884d179dSJan Kara } 2262884d179dSJan Kara EXPORT_SYMBOL(vfs_dq_quota_on_remount); 2263884d179dSJan Kara 2264884d179dSJan Kara static inline qsize_t qbtos(qsize_t blocks) 2265884d179dSJan Kara { 2266884d179dSJan Kara return blocks << QIF_DQBLKSIZE_BITS; 2267884d179dSJan Kara } 2268884d179dSJan Kara 2269884d179dSJan Kara static inline qsize_t stoqb(qsize_t space) 2270884d179dSJan Kara { 2271884d179dSJan Kara return (space + QIF_DQBLKSIZE - 1) >> QIF_DQBLKSIZE_BITS; 2272884d179dSJan Kara } 2273884d179dSJan Kara 2274884d179dSJan Kara /* Generic routine for getting common part of quota structure */ 2275884d179dSJan Kara static void do_get_dqblk(struct dquot *dquot, struct if_dqblk *di) 2276884d179dSJan Kara { 2277884d179dSJan Kara struct mem_dqblk *dm = &dquot->dq_dqb; 2278884d179dSJan Kara 2279884d179dSJan Kara spin_lock(&dq_data_lock); 2280884d179dSJan Kara di->dqb_bhardlimit = stoqb(dm->dqb_bhardlimit); 2281884d179dSJan Kara di->dqb_bsoftlimit = stoqb(dm->dqb_bsoftlimit); 2282884d179dSJan Kara di->dqb_curspace = dm->dqb_curspace + dm->dqb_rsvspace; 2283884d179dSJan Kara di->dqb_ihardlimit = dm->dqb_ihardlimit; 2284884d179dSJan Kara di->dqb_isoftlimit = dm->dqb_isoftlimit; 2285884d179dSJan Kara di->dqb_curinodes = dm->dqb_curinodes; 2286884d179dSJan Kara di->dqb_btime = dm->dqb_btime; 2287884d179dSJan Kara di->dqb_itime = dm->dqb_itime; 2288884d179dSJan Kara di->dqb_valid = QIF_ALL; 2289884d179dSJan Kara spin_unlock(&dq_data_lock); 2290884d179dSJan Kara } 2291884d179dSJan Kara 2292268157baSJan Kara int vfs_get_dqblk(struct super_block *sb, int type, qid_t id, 2293268157baSJan Kara struct if_dqblk *di) 2294884d179dSJan Kara { 2295884d179dSJan Kara struct dquot *dquot; 2296884d179dSJan Kara 2297884d179dSJan Kara dquot = dqget(sb, id, type); 2298dd6f3c6dSJan Kara if (!dquot) 2299884d179dSJan Kara return -ESRCH; 2300884d179dSJan Kara do_get_dqblk(dquot, di); 2301884d179dSJan Kara dqput(dquot); 2302884d179dSJan Kara 2303884d179dSJan Kara return 0; 2304884d179dSJan Kara } 2305884d179dSJan Kara EXPORT_SYMBOL(vfs_get_dqblk); 2306884d179dSJan Kara 2307884d179dSJan Kara /* Generic routine for setting common part of quota structure */ 2308884d179dSJan Kara static int do_set_dqblk(struct dquot *dquot, struct if_dqblk *di) 2309884d179dSJan Kara { 2310884d179dSJan Kara struct mem_dqblk *dm = &dquot->dq_dqb; 2311884d179dSJan Kara int check_blim = 0, check_ilim = 0; 2312884d179dSJan Kara struct mem_dqinfo *dqi = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_type]; 2313884d179dSJan Kara 2314884d179dSJan Kara if ((di->dqb_valid & QIF_BLIMITS && 2315884d179dSJan Kara (di->dqb_bhardlimit > dqi->dqi_maxblimit || 2316884d179dSJan Kara di->dqb_bsoftlimit > dqi->dqi_maxblimit)) || 2317884d179dSJan Kara (di->dqb_valid & QIF_ILIMITS && 2318884d179dSJan Kara (di->dqb_ihardlimit > dqi->dqi_maxilimit || 2319884d179dSJan Kara di->dqb_isoftlimit > dqi->dqi_maxilimit))) 2320884d179dSJan Kara return -ERANGE; 2321884d179dSJan Kara 2322884d179dSJan Kara spin_lock(&dq_data_lock); 2323884d179dSJan Kara if (di->dqb_valid & QIF_SPACE) { 2324884d179dSJan Kara dm->dqb_curspace = di->dqb_curspace - dm->dqb_rsvspace; 2325884d179dSJan Kara check_blim = 1; 2326884d179dSJan Kara __set_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags); 2327884d179dSJan Kara } 2328884d179dSJan Kara if (di->dqb_valid & QIF_BLIMITS) { 2329884d179dSJan Kara dm->dqb_bsoftlimit = qbtos(di->dqb_bsoftlimit); 2330884d179dSJan Kara dm->dqb_bhardlimit = qbtos(di->dqb_bhardlimit); 2331884d179dSJan Kara check_blim = 1; 2332884d179dSJan Kara __set_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags); 2333884d179dSJan Kara } 2334884d179dSJan Kara if (di->dqb_valid & QIF_INODES) { 2335884d179dSJan Kara dm->dqb_curinodes = di->dqb_curinodes; 2336884d179dSJan Kara check_ilim = 1; 2337884d179dSJan Kara __set_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags); 2338884d179dSJan Kara } 2339884d179dSJan Kara if (di->dqb_valid & QIF_ILIMITS) { 2340884d179dSJan Kara dm->dqb_isoftlimit = di->dqb_isoftlimit; 2341884d179dSJan Kara dm->dqb_ihardlimit = di->dqb_ihardlimit; 2342884d179dSJan Kara check_ilim = 1; 2343884d179dSJan Kara __set_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags); 2344884d179dSJan Kara } 2345884d179dSJan Kara if (di->dqb_valid & QIF_BTIME) { 2346884d179dSJan Kara dm->dqb_btime = di->dqb_btime; 2347884d179dSJan Kara check_blim = 1; 2348884d179dSJan Kara __set_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags); 2349884d179dSJan Kara } 2350884d179dSJan Kara if (di->dqb_valid & QIF_ITIME) { 2351884d179dSJan Kara dm->dqb_itime = di->dqb_itime; 2352884d179dSJan Kara check_ilim = 1; 2353884d179dSJan Kara __set_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags); 2354884d179dSJan Kara } 2355884d179dSJan Kara 2356884d179dSJan Kara if (check_blim) { 2357268157baSJan Kara if (!dm->dqb_bsoftlimit || 2358268157baSJan Kara dm->dqb_curspace < dm->dqb_bsoftlimit) { 2359884d179dSJan Kara dm->dqb_btime = 0; 2360884d179dSJan Kara clear_bit(DQ_BLKS_B, &dquot->dq_flags); 2361268157baSJan Kara } else if (!(di->dqb_valid & QIF_BTIME)) 2362268157baSJan Kara /* Set grace only if user hasn't provided his own... */ 2363884d179dSJan Kara dm->dqb_btime = get_seconds() + dqi->dqi_bgrace; 2364884d179dSJan Kara } 2365884d179dSJan Kara if (check_ilim) { 2366268157baSJan Kara if (!dm->dqb_isoftlimit || 2367268157baSJan Kara dm->dqb_curinodes < dm->dqb_isoftlimit) { 2368884d179dSJan Kara dm->dqb_itime = 0; 2369884d179dSJan Kara clear_bit(DQ_INODES_B, &dquot->dq_flags); 2370268157baSJan Kara } else if (!(di->dqb_valid & QIF_ITIME)) 2371268157baSJan Kara /* Set grace only if user hasn't provided his own... */ 2372884d179dSJan Kara dm->dqb_itime = get_seconds() + dqi->dqi_igrace; 2373884d179dSJan Kara } 2374268157baSJan Kara if (dm->dqb_bhardlimit || dm->dqb_bsoftlimit || dm->dqb_ihardlimit || 2375268157baSJan Kara dm->dqb_isoftlimit) 2376884d179dSJan Kara clear_bit(DQ_FAKE_B, &dquot->dq_flags); 2377884d179dSJan Kara else 2378884d179dSJan Kara set_bit(DQ_FAKE_B, &dquot->dq_flags); 2379884d179dSJan Kara spin_unlock(&dq_data_lock); 2380884d179dSJan Kara mark_dquot_dirty(dquot); 2381884d179dSJan Kara 2382884d179dSJan Kara return 0; 2383884d179dSJan Kara } 2384884d179dSJan Kara 2385268157baSJan Kara int vfs_set_dqblk(struct super_block *sb, int type, qid_t id, 2386268157baSJan Kara struct if_dqblk *di) 2387884d179dSJan Kara { 2388884d179dSJan Kara struct dquot *dquot; 2389884d179dSJan Kara int rc; 2390884d179dSJan Kara 2391884d179dSJan Kara dquot = dqget(sb, id, type); 2392884d179dSJan Kara if (!dquot) { 2393884d179dSJan Kara rc = -ESRCH; 2394884d179dSJan Kara goto out; 2395884d179dSJan Kara } 2396884d179dSJan Kara rc = do_set_dqblk(dquot, di); 2397884d179dSJan Kara dqput(dquot); 2398884d179dSJan Kara out: 2399884d179dSJan Kara return rc; 2400884d179dSJan Kara } 2401884d179dSJan Kara EXPORT_SYMBOL(vfs_set_dqblk); 2402884d179dSJan Kara 2403884d179dSJan Kara /* Generic routine for getting common part of quota file information */ 2404884d179dSJan Kara int vfs_get_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii) 2405884d179dSJan Kara { 2406884d179dSJan Kara struct mem_dqinfo *mi; 2407884d179dSJan Kara 2408884d179dSJan Kara mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); 2409884d179dSJan Kara if (!sb_has_quota_active(sb, type)) { 2410884d179dSJan Kara mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); 2411884d179dSJan Kara return -ESRCH; 2412884d179dSJan Kara } 2413884d179dSJan Kara mi = sb_dqopt(sb)->info + type; 2414884d179dSJan Kara spin_lock(&dq_data_lock); 2415884d179dSJan Kara ii->dqi_bgrace = mi->dqi_bgrace; 2416884d179dSJan Kara ii->dqi_igrace = mi->dqi_igrace; 2417884d179dSJan Kara ii->dqi_flags = mi->dqi_flags & DQF_MASK; 2418884d179dSJan Kara ii->dqi_valid = IIF_ALL; 2419884d179dSJan Kara spin_unlock(&dq_data_lock); 2420884d179dSJan Kara mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); 2421884d179dSJan Kara return 0; 2422884d179dSJan Kara } 2423884d179dSJan Kara EXPORT_SYMBOL(vfs_get_dqinfo); 2424884d179dSJan Kara 2425884d179dSJan Kara /* Generic routine for setting common part of quota file information */ 2426884d179dSJan Kara int vfs_set_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii) 2427884d179dSJan Kara { 2428884d179dSJan Kara struct mem_dqinfo *mi; 2429884d179dSJan Kara int err = 0; 2430884d179dSJan Kara 2431884d179dSJan Kara mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); 2432884d179dSJan Kara if (!sb_has_quota_active(sb, type)) { 2433884d179dSJan Kara err = -ESRCH; 2434884d179dSJan Kara goto out; 2435884d179dSJan Kara } 2436884d179dSJan Kara mi = sb_dqopt(sb)->info + type; 2437884d179dSJan Kara spin_lock(&dq_data_lock); 2438884d179dSJan Kara if (ii->dqi_valid & IIF_BGRACE) 2439884d179dSJan Kara mi->dqi_bgrace = ii->dqi_bgrace; 2440884d179dSJan Kara if (ii->dqi_valid & IIF_IGRACE) 2441884d179dSJan Kara mi->dqi_igrace = ii->dqi_igrace; 2442884d179dSJan Kara if (ii->dqi_valid & IIF_FLAGS) 2443268157baSJan Kara mi->dqi_flags = (mi->dqi_flags & ~DQF_MASK) | 2444268157baSJan Kara (ii->dqi_flags & DQF_MASK); 2445884d179dSJan Kara spin_unlock(&dq_data_lock); 2446884d179dSJan Kara mark_info_dirty(sb, type); 2447884d179dSJan Kara /* Force write to disk */ 2448884d179dSJan Kara sb->dq_op->write_info(sb, type); 2449884d179dSJan Kara out: 2450884d179dSJan Kara mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); 2451884d179dSJan Kara return err; 2452884d179dSJan Kara } 2453884d179dSJan Kara EXPORT_SYMBOL(vfs_set_dqinfo); 2454884d179dSJan Kara 24550d54b217SAlexey Dobriyan const struct quotactl_ops vfs_quotactl_ops = { 2456884d179dSJan Kara .quota_on = vfs_quota_on, 2457884d179dSJan Kara .quota_off = vfs_quota_off, 2458884d179dSJan Kara .quota_sync = vfs_quota_sync, 2459884d179dSJan Kara .get_info = vfs_get_dqinfo, 2460884d179dSJan Kara .set_info = vfs_set_dqinfo, 2461884d179dSJan Kara .get_dqblk = vfs_get_dqblk, 2462884d179dSJan Kara .set_dqblk = vfs_set_dqblk 2463884d179dSJan Kara }; 2464884d179dSJan Kara 2465884d179dSJan Kara static ctl_table fs_dqstats_table[] = { 2466884d179dSJan Kara { 2467884d179dSJan Kara .procname = "lookups", 2468884d179dSJan Kara .data = &dqstats.lookups, 2469884d179dSJan Kara .maxlen = sizeof(int), 2470884d179dSJan Kara .mode = 0444, 24716d456111SEric W. Biederman .proc_handler = proc_dointvec, 2472884d179dSJan Kara }, 2473884d179dSJan Kara { 2474884d179dSJan Kara .procname = "drops", 2475884d179dSJan Kara .data = &dqstats.drops, 2476884d179dSJan Kara .maxlen = sizeof(int), 2477884d179dSJan Kara .mode = 0444, 24786d456111SEric W. Biederman .proc_handler = proc_dointvec, 2479884d179dSJan Kara }, 2480884d179dSJan Kara { 2481884d179dSJan Kara .procname = "reads", 2482884d179dSJan Kara .data = &dqstats.reads, 2483884d179dSJan Kara .maxlen = sizeof(int), 2484884d179dSJan Kara .mode = 0444, 24856d456111SEric W. Biederman .proc_handler = proc_dointvec, 2486884d179dSJan Kara }, 2487884d179dSJan Kara { 2488884d179dSJan Kara .procname = "writes", 2489884d179dSJan Kara .data = &dqstats.writes, 2490884d179dSJan Kara .maxlen = sizeof(int), 2491884d179dSJan Kara .mode = 0444, 24926d456111SEric W. Biederman .proc_handler = proc_dointvec, 2493884d179dSJan Kara }, 2494884d179dSJan Kara { 2495884d179dSJan Kara .procname = "cache_hits", 2496884d179dSJan Kara .data = &dqstats.cache_hits, 2497884d179dSJan Kara .maxlen = sizeof(int), 2498884d179dSJan Kara .mode = 0444, 24996d456111SEric W. Biederman .proc_handler = proc_dointvec, 2500884d179dSJan Kara }, 2501884d179dSJan Kara { 2502884d179dSJan Kara .procname = "allocated_dquots", 2503884d179dSJan Kara .data = &dqstats.allocated_dquots, 2504884d179dSJan Kara .maxlen = sizeof(int), 2505884d179dSJan Kara .mode = 0444, 25066d456111SEric W. Biederman .proc_handler = proc_dointvec, 2507884d179dSJan Kara }, 2508884d179dSJan Kara { 2509884d179dSJan Kara .procname = "free_dquots", 2510884d179dSJan Kara .data = &dqstats.free_dquots, 2511884d179dSJan Kara .maxlen = sizeof(int), 2512884d179dSJan Kara .mode = 0444, 25136d456111SEric W. Biederman .proc_handler = proc_dointvec, 2514884d179dSJan Kara }, 2515884d179dSJan Kara { 2516884d179dSJan Kara .procname = "syncs", 2517884d179dSJan Kara .data = &dqstats.syncs, 2518884d179dSJan Kara .maxlen = sizeof(int), 2519884d179dSJan Kara .mode = 0444, 25206d456111SEric W. Biederman .proc_handler = proc_dointvec, 2521884d179dSJan Kara }, 2522884d179dSJan Kara #ifdef CONFIG_PRINT_QUOTA_WARNING 2523884d179dSJan Kara { 2524884d179dSJan Kara .procname = "warnings", 2525884d179dSJan Kara .data = &flag_print_warnings, 2526884d179dSJan Kara .maxlen = sizeof(int), 2527884d179dSJan Kara .mode = 0644, 25286d456111SEric W. Biederman .proc_handler = proc_dointvec, 2529884d179dSJan Kara }, 2530884d179dSJan Kara #endif 2531ab09203eSEric W. Biederman { }, 2532884d179dSJan Kara }; 2533884d179dSJan Kara 2534884d179dSJan Kara static ctl_table fs_table[] = { 2535884d179dSJan Kara { 2536884d179dSJan Kara .procname = "quota", 2537884d179dSJan Kara .mode = 0555, 2538884d179dSJan Kara .child = fs_dqstats_table, 2539884d179dSJan Kara }, 2540ab09203eSEric W. Biederman { }, 2541884d179dSJan Kara }; 2542884d179dSJan Kara 2543884d179dSJan Kara static ctl_table sys_table[] = { 2544884d179dSJan Kara { 2545884d179dSJan Kara .procname = "fs", 2546884d179dSJan Kara .mode = 0555, 2547884d179dSJan Kara .child = fs_table, 2548884d179dSJan Kara }, 2549ab09203eSEric W. Biederman { }, 2550884d179dSJan Kara }; 2551884d179dSJan Kara 2552884d179dSJan Kara static int __init dquot_init(void) 2553884d179dSJan Kara { 2554884d179dSJan Kara int i; 2555884d179dSJan Kara unsigned long nr_hash, order; 2556884d179dSJan Kara 2557884d179dSJan Kara printk(KERN_NOTICE "VFS: Disk quotas %s\n", __DQUOT_VERSION__); 2558884d179dSJan Kara 2559884d179dSJan Kara register_sysctl_table(sys_table); 2560884d179dSJan Kara 2561884d179dSJan Kara dquot_cachep = kmem_cache_create("dquot", 2562884d179dSJan Kara sizeof(struct dquot), sizeof(unsigned long) * 4, 2563884d179dSJan Kara (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| 2564884d179dSJan Kara SLAB_MEM_SPREAD|SLAB_PANIC), 2565884d179dSJan Kara NULL); 2566884d179dSJan Kara 2567884d179dSJan Kara order = 0; 2568884d179dSJan Kara dquot_hash = (struct hlist_head *)__get_free_pages(GFP_ATOMIC, order); 2569884d179dSJan Kara if (!dquot_hash) 2570884d179dSJan Kara panic("Cannot create dquot hash table"); 2571884d179dSJan Kara 2572884d179dSJan Kara /* Find power-of-two hlist_heads which can fit into allocation */ 2573884d179dSJan Kara nr_hash = (1UL << order) * PAGE_SIZE / sizeof(struct hlist_head); 2574884d179dSJan Kara dq_hash_bits = 0; 2575884d179dSJan Kara do { 2576884d179dSJan Kara dq_hash_bits++; 2577884d179dSJan Kara } while (nr_hash >> dq_hash_bits); 2578884d179dSJan Kara dq_hash_bits--; 2579884d179dSJan Kara 2580884d179dSJan Kara nr_hash = 1UL << dq_hash_bits; 2581884d179dSJan Kara dq_hash_mask = nr_hash - 1; 2582884d179dSJan Kara for (i = 0; i < nr_hash; i++) 2583884d179dSJan Kara INIT_HLIST_HEAD(dquot_hash + i); 2584884d179dSJan Kara 2585884d179dSJan Kara printk("Dquot-cache hash table entries: %ld (order %ld, %ld bytes)\n", 2586884d179dSJan Kara nr_hash, order, (PAGE_SIZE << order)); 2587884d179dSJan Kara 2588884d179dSJan Kara register_shrinker(&dqcache_shrinker); 2589884d179dSJan Kara 2590884d179dSJan Kara return 0; 2591884d179dSJan Kara } 2592884d179dSJan Kara module_init(dquot_init); 2593