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 232884d179dSJan Kara static inline unsigned int 233884d179dSJan Kara hashfn(const struct super_block *sb, unsigned int id, int type) 234884d179dSJan Kara { 235884d179dSJan Kara unsigned long tmp; 236884d179dSJan Kara 237884d179dSJan Kara tmp = (((unsigned long)sb>>L1_CACHE_SHIFT) ^ id) * (MAXQUOTAS - type); 238884d179dSJan Kara return (tmp + (tmp >> dq_hash_bits)) & dq_hash_mask; 239884d179dSJan Kara } 240884d179dSJan Kara 241884d179dSJan Kara /* 242884d179dSJan Kara * Following list functions expect dq_list_lock to be held 243884d179dSJan Kara */ 244884d179dSJan Kara static inline void insert_dquot_hash(struct dquot *dquot) 245884d179dSJan Kara { 246268157baSJan Kara struct hlist_head *head; 247268157baSJan Kara head = dquot_hash + hashfn(dquot->dq_sb, dquot->dq_id, dquot->dq_type); 248884d179dSJan Kara hlist_add_head(&dquot->dq_hash, head); 249884d179dSJan Kara } 250884d179dSJan Kara 251884d179dSJan Kara static inline void remove_dquot_hash(struct dquot *dquot) 252884d179dSJan Kara { 253884d179dSJan Kara hlist_del_init(&dquot->dq_hash); 254884d179dSJan Kara } 255884d179dSJan Kara 2567a2435d8SJan Kara static struct dquot *find_dquot(unsigned int hashent, struct super_block *sb, 2577a2435d8SJan Kara unsigned int id, int type) 258884d179dSJan Kara { 259884d179dSJan Kara struct hlist_node *node; 260884d179dSJan Kara struct dquot *dquot; 261884d179dSJan Kara 262884d179dSJan Kara hlist_for_each (node, dquot_hash+hashent) { 263884d179dSJan Kara dquot = hlist_entry(node, struct dquot, dq_hash); 264268157baSJan Kara if (dquot->dq_sb == sb && dquot->dq_id == id && 265268157baSJan Kara dquot->dq_type == type) 266884d179dSJan Kara return dquot; 267884d179dSJan Kara } 268dd6f3c6dSJan Kara return NULL; 269884d179dSJan Kara } 270884d179dSJan Kara 271884d179dSJan Kara /* Add a dquot to the tail of the free list */ 272884d179dSJan Kara static inline void put_dquot_last(struct dquot *dquot) 273884d179dSJan Kara { 274884d179dSJan Kara list_add_tail(&dquot->dq_free, &free_dquots); 275884d179dSJan Kara dqstats.free_dquots++; 276884d179dSJan Kara } 277884d179dSJan Kara 278884d179dSJan Kara static inline void remove_free_dquot(struct dquot *dquot) 279884d179dSJan Kara { 280884d179dSJan Kara if (list_empty(&dquot->dq_free)) 281884d179dSJan Kara return; 282884d179dSJan Kara list_del_init(&dquot->dq_free); 283884d179dSJan Kara dqstats.free_dquots--; 284884d179dSJan Kara } 285884d179dSJan Kara 286884d179dSJan Kara static inline void put_inuse(struct dquot *dquot) 287884d179dSJan Kara { 288884d179dSJan Kara /* We add to the back of inuse list so we don't have to restart 289884d179dSJan Kara * when traversing this list and we block */ 290884d179dSJan Kara list_add_tail(&dquot->dq_inuse, &inuse_list); 291884d179dSJan Kara dqstats.allocated_dquots++; 292884d179dSJan Kara } 293884d179dSJan Kara 294884d179dSJan Kara static inline void remove_inuse(struct dquot *dquot) 295884d179dSJan Kara { 296884d179dSJan Kara dqstats.allocated_dquots--; 297884d179dSJan Kara list_del(&dquot->dq_inuse); 298884d179dSJan Kara } 299884d179dSJan Kara /* 300884d179dSJan Kara * End of list functions needing dq_list_lock 301884d179dSJan Kara */ 302884d179dSJan Kara 303884d179dSJan Kara static void wait_on_dquot(struct dquot *dquot) 304884d179dSJan Kara { 305884d179dSJan Kara mutex_lock(&dquot->dq_lock); 306884d179dSJan Kara mutex_unlock(&dquot->dq_lock); 307884d179dSJan Kara } 308884d179dSJan Kara 309884d179dSJan Kara static inline int dquot_dirty(struct dquot *dquot) 310884d179dSJan Kara { 311884d179dSJan Kara return test_bit(DQ_MOD_B, &dquot->dq_flags); 312884d179dSJan Kara } 313884d179dSJan Kara 314884d179dSJan Kara static inline int mark_dquot_dirty(struct dquot *dquot) 315884d179dSJan Kara { 316884d179dSJan Kara return dquot->dq_sb->dq_op->mark_dirty(dquot); 317884d179dSJan Kara } 318884d179dSJan Kara 319884d179dSJan Kara int dquot_mark_dquot_dirty(struct dquot *dquot) 320884d179dSJan Kara { 321884d179dSJan Kara spin_lock(&dq_list_lock); 322884d179dSJan Kara if (!test_and_set_bit(DQ_MOD_B, &dquot->dq_flags)) 323884d179dSJan Kara list_add(&dquot->dq_dirty, &sb_dqopt(dquot->dq_sb)-> 324884d179dSJan Kara info[dquot->dq_type].dqi_dirty_list); 325884d179dSJan Kara spin_unlock(&dq_list_lock); 326884d179dSJan Kara return 0; 327884d179dSJan Kara } 328884d179dSJan Kara EXPORT_SYMBOL(dquot_mark_dquot_dirty); 329884d179dSJan Kara 330dc52dd3aSDmitry Monakhov /* Dirtify all the dquots - this can block when journalling */ 331dc52dd3aSDmitry Monakhov static inline int mark_all_dquot_dirty(struct dquot * const *dquot) 332dc52dd3aSDmitry Monakhov { 333dc52dd3aSDmitry Monakhov int ret, err, cnt; 334dc52dd3aSDmitry Monakhov 335dc52dd3aSDmitry Monakhov ret = err = 0; 336dc52dd3aSDmitry Monakhov for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 337dc52dd3aSDmitry Monakhov if (dquot[cnt]) 338dc52dd3aSDmitry Monakhov /* Even in case of error we have to continue */ 339dc52dd3aSDmitry Monakhov ret = mark_dquot_dirty(dquot[cnt]); 340dc52dd3aSDmitry Monakhov if (!err) 341dc52dd3aSDmitry Monakhov err = ret; 342dc52dd3aSDmitry Monakhov } 343dc52dd3aSDmitry Monakhov return err; 344dc52dd3aSDmitry Monakhov } 345dc52dd3aSDmitry Monakhov 346dc52dd3aSDmitry Monakhov static inline void dqput_all(struct dquot **dquot) 347dc52dd3aSDmitry Monakhov { 348dc52dd3aSDmitry Monakhov unsigned int cnt; 349dc52dd3aSDmitry Monakhov 350dc52dd3aSDmitry Monakhov for (cnt = 0; cnt < MAXQUOTAS; cnt++) 351dc52dd3aSDmitry Monakhov dqput(dquot[cnt]); 352dc52dd3aSDmitry Monakhov } 353dc52dd3aSDmitry Monakhov 354884d179dSJan Kara /* This function needs dq_list_lock */ 355884d179dSJan Kara static inline int clear_dquot_dirty(struct dquot *dquot) 356884d179dSJan Kara { 357884d179dSJan Kara if (!test_and_clear_bit(DQ_MOD_B, &dquot->dq_flags)) 358884d179dSJan Kara return 0; 359884d179dSJan Kara list_del_init(&dquot->dq_dirty); 360884d179dSJan Kara return 1; 361884d179dSJan Kara } 362884d179dSJan Kara 363884d179dSJan Kara void mark_info_dirty(struct super_block *sb, int type) 364884d179dSJan Kara { 365884d179dSJan Kara set_bit(DQF_INFO_DIRTY_B, &sb_dqopt(sb)->info[type].dqi_flags); 366884d179dSJan Kara } 367884d179dSJan Kara EXPORT_SYMBOL(mark_info_dirty); 368884d179dSJan Kara 369884d179dSJan Kara /* 370884d179dSJan Kara * Read dquot from disk and alloc space for it 371884d179dSJan Kara */ 372884d179dSJan Kara 373884d179dSJan Kara int dquot_acquire(struct dquot *dquot) 374884d179dSJan Kara { 375884d179dSJan Kara int ret = 0, ret2 = 0; 376884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); 377884d179dSJan Kara 378884d179dSJan Kara mutex_lock(&dquot->dq_lock); 379884d179dSJan Kara mutex_lock(&dqopt->dqio_mutex); 380884d179dSJan Kara if (!test_bit(DQ_READ_B, &dquot->dq_flags)) 381884d179dSJan Kara ret = dqopt->ops[dquot->dq_type]->read_dqblk(dquot); 382884d179dSJan Kara if (ret < 0) 383884d179dSJan Kara goto out_iolock; 384884d179dSJan Kara set_bit(DQ_READ_B, &dquot->dq_flags); 385884d179dSJan Kara /* Instantiate dquot if needed */ 386884d179dSJan Kara if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && !dquot->dq_off) { 387884d179dSJan Kara ret = dqopt->ops[dquot->dq_type]->commit_dqblk(dquot); 388884d179dSJan Kara /* Write the info if needed */ 389268157baSJan Kara if (info_dirty(&dqopt->info[dquot->dq_type])) { 390268157baSJan Kara ret2 = dqopt->ops[dquot->dq_type]->write_file_info( 391268157baSJan Kara dquot->dq_sb, dquot->dq_type); 392268157baSJan Kara } 393884d179dSJan Kara if (ret < 0) 394884d179dSJan Kara goto out_iolock; 395884d179dSJan Kara if (ret2 < 0) { 396884d179dSJan Kara ret = ret2; 397884d179dSJan Kara goto out_iolock; 398884d179dSJan Kara } 399884d179dSJan Kara } 400884d179dSJan Kara set_bit(DQ_ACTIVE_B, &dquot->dq_flags); 401884d179dSJan Kara out_iolock: 402884d179dSJan Kara mutex_unlock(&dqopt->dqio_mutex); 403884d179dSJan Kara mutex_unlock(&dquot->dq_lock); 404884d179dSJan Kara return ret; 405884d179dSJan Kara } 406884d179dSJan Kara EXPORT_SYMBOL(dquot_acquire); 407884d179dSJan Kara 408884d179dSJan Kara /* 409884d179dSJan Kara * Write dquot to disk 410884d179dSJan Kara */ 411884d179dSJan Kara int dquot_commit(struct dquot *dquot) 412884d179dSJan Kara { 413884d179dSJan Kara int ret = 0, ret2 = 0; 414884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); 415884d179dSJan Kara 416884d179dSJan Kara mutex_lock(&dqopt->dqio_mutex); 417884d179dSJan Kara spin_lock(&dq_list_lock); 418884d179dSJan Kara if (!clear_dquot_dirty(dquot)) { 419884d179dSJan Kara spin_unlock(&dq_list_lock); 420884d179dSJan Kara goto out_sem; 421884d179dSJan Kara } 422884d179dSJan Kara spin_unlock(&dq_list_lock); 423884d179dSJan Kara /* Inactive dquot can be only if there was error during read/init 424884d179dSJan Kara * => we have better not writing it */ 425884d179dSJan Kara if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { 426884d179dSJan Kara ret = dqopt->ops[dquot->dq_type]->commit_dqblk(dquot); 427268157baSJan Kara if (info_dirty(&dqopt->info[dquot->dq_type])) { 428268157baSJan Kara ret2 = dqopt->ops[dquot->dq_type]->write_file_info( 429268157baSJan Kara dquot->dq_sb, dquot->dq_type); 430268157baSJan Kara } 431884d179dSJan Kara if (ret >= 0) 432884d179dSJan Kara ret = ret2; 433884d179dSJan Kara } 434884d179dSJan Kara out_sem: 435884d179dSJan Kara mutex_unlock(&dqopt->dqio_mutex); 436884d179dSJan Kara return ret; 437884d179dSJan Kara } 438884d179dSJan Kara EXPORT_SYMBOL(dquot_commit); 439884d179dSJan Kara 440884d179dSJan Kara /* 441884d179dSJan Kara * Release dquot 442884d179dSJan Kara */ 443884d179dSJan Kara int dquot_release(struct dquot *dquot) 444884d179dSJan Kara { 445884d179dSJan Kara int ret = 0, ret2 = 0; 446884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); 447884d179dSJan Kara 448884d179dSJan Kara mutex_lock(&dquot->dq_lock); 449884d179dSJan Kara /* Check whether we are not racing with some other dqget() */ 450884d179dSJan Kara if (atomic_read(&dquot->dq_count) > 1) 451884d179dSJan Kara goto out_dqlock; 452884d179dSJan Kara mutex_lock(&dqopt->dqio_mutex); 453884d179dSJan Kara if (dqopt->ops[dquot->dq_type]->release_dqblk) { 454884d179dSJan Kara ret = dqopt->ops[dquot->dq_type]->release_dqblk(dquot); 455884d179dSJan Kara /* Write the info */ 456268157baSJan Kara if (info_dirty(&dqopt->info[dquot->dq_type])) { 457268157baSJan Kara ret2 = dqopt->ops[dquot->dq_type]->write_file_info( 458268157baSJan Kara dquot->dq_sb, dquot->dq_type); 459268157baSJan Kara } 460884d179dSJan Kara if (ret >= 0) 461884d179dSJan Kara ret = ret2; 462884d179dSJan Kara } 463884d179dSJan Kara clear_bit(DQ_ACTIVE_B, &dquot->dq_flags); 464884d179dSJan Kara mutex_unlock(&dqopt->dqio_mutex); 465884d179dSJan Kara out_dqlock: 466884d179dSJan Kara mutex_unlock(&dquot->dq_lock); 467884d179dSJan Kara return ret; 468884d179dSJan Kara } 469884d179dSJan Kara EXPORT_SYMBOL(dquot_release); 470884d179dSJan Kara 471884d179dSJan Kara void dquot_destroy(struct dquot *dquot) 472884d179dSJan Kara { 473884d179dSJan Kara kmem_cache_free(dquot_cachep, dquot); 474884d179dSJan Kara } 475884d179dSJan Kara EXPORT_SYMBOL(dquot_destroy); 476884d179dSJan Kara 477884d179dSJan Kara static inline void do_destroy_dquot(struct dquot *dquot) 478884d179dSJan Kara { 479884d179dSJan Kara dquot->dq_sb->dq_op->destroy_dquot(dquot); 480884d179dSJan Kara } 481884d179dSJan Kara 482884d179dSJan Kara /* Invalidate all dquots on the list. Note that this function is called after 483884d179dSJan Kara * quota is disabled and pointers from inodes removed so there cannot be new 484884d179dSJan Kara * quota users. There can still be some users of quotas due to inodes being 485884d179dSJan Kara * just deleted or pruned by prune_icache() (those are not attached to any 486884d179dSJan Kara * list) or parallel quotactl call. We have to wait for such users. 487884d179dSJan Kara */ 488884d179dSJan Kara static void invalidate_dquots(struct super_block *sb, int type) 489884d179dSJan Kara { 490884d179dSJan Kara struct dquot *dquot, *tmp; 491884d179dSJan Kara 492884d179dSJan Kara restart: 493884d179dSJan Kara spin_lock(&dq_list_lock); 494884d179dSJan Kara list_for_each_entry_safe(dquot, tmp, &inuse_list, dq_inuse) { 495884d179dSJan Kara if (dquot->dq_sb != sb) 496884d179dSJan Kara continue; 497884d179dSJan Kara if (dquot->dq_type != type) 498884d179dSJan Kara continue; 499884d179dSJan Kara /* Wait for dquot users */ 500884d179dSJan Kara if (atomic_read(&dquot->dq_count)) { 501884d179dSJan Kara DEFINE_WAIT(wait); 502884d179dSJan Kara 503884d179dSJan Kara atomic_inc(&dquot->dq_count); 504884d179dSJan Kara prepare_to_wait(&dquot->dq_wait_unused, &wait, 505884d179dSJan Kara TASK_UNINTERRUPTIBLE); 506884d179dSJan Kara spin_unlock(&dq_list_lock); 507884d179dSJan Kara /* Once dqput() wakes us up, we know it's time to free 508884d179dSJan Kara * the dquot. 509884d179dSJan Kara * IMPORTANT: we rely on the fact that there is always 510884d179dSJan Kara * at most one process waiting for dquot to free. 511884d179dSJan Kara * Otherwise dq_count would be > 1 and we would never 512884d179dSJan Kara * wake up. 513884d179dSJan Kara */ 514884d179dSJan Kara if (atomic_read(&dquot->dq_count) > 1) 515884d179dSJan Kara schedule(); 516884d179dSJan Kara finish_wait(&dquot->dq_wait_unused, &wait); 517884d179dSJan Kara dqput(dquot); 518884d179dSJan Kara /* At this moment dquot() need not exist (it could be 519884d179dSJan Kara * reclaimed by prune_dqcache(). Hence we must 520884d179dSJan Kara * restart. */ 521884d179dSJan Kara goto restart; 522884d179dSJan Kara } 523884d179dSJan Kara /* 524884d179dSJan Kara * Quota now has no users and it has been written on last 525884d179dSJan Kara * dqput() 526884d179dSJan Kara */ 527884d179dSJan Kara remove_dquot_hash(dquot); 528884d179dSJan Kara remove_free_dquot(dquot); 529884d179dSJan Kara remove_inuse(dquot); 530884d179dSJan Kara do_destroy_dquot(dquot); 531884d179dSJan Kara } 532884d179dSJan Kara spin_unlock(&dq_list_lock); 533884d179dSJan Kara } 534884d179dSJan Kara 535884d179dSJan Kara /* Call callback for every active dquot on given filesystem */ 536884d179dSJan Kara int dquot_scan_active(struct super_block *sb, 537884d179dSJan Kara int (*fn)(struct dquot *dquot, unsigned long priv), 538884d179dSJan Kara unsigned long priv) 539884d179dSJan Kara { 540884d179dSJan Kara struct dquot *dquot, *old_dquot = NULL; 541884d179dSJan Kara int ret = 0; 542884d179dSJan Kara 543884d179dSJan Kara mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); 544884d179dSJan Kara spin_lock(&dq_list_lock); 545884d179dSJan Kara list_for_each_entry(dquot, &inuse_list, dq_inuse) { 546884d179dSJan Kara if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) 547884d179dSJan Kara continue; 548884d179dSJan Kara if (dquot->dq_sb != sb) 549884d179dSJan Kara continue; 550884d179dSJan Kara /* Now we have active dquot so we can just increase use count */ 551884d179dSJan Kara atomic_inc(&dquot->dq_count); 552884d179dSJan Kara dqstats.lookups++; 553884d179dSJan Kara spin_unlock(&dq_list_lock); 554884d179dSJan Kara dqput(old_dquot); 555884d179dSJan Kara old_dquot = dquot; 556884d179dSJan Kara ret = fn(dquot, priv); 557884d179dSJan Kara if (ret < 0) 558884d179dSJan Kara goto out; 559884d179dSJan Kara spin_lock(&dq_list_lock); 560884d179dSJan Kara /* We are safe to continue now because our dquot could not 561884d179dSJan Kara * be moved out of the inuse list while we hold the reference */ 562884d179dSJan Kara } 563884d179dSJan Kara spin_unlock(&dq_list_lock); 564884d179dSJan Kara out: 565884d179dSJan Kara dqput(old_dquot); 566884d179dSJan Kara mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); 567884d179dSJan Kara return ret; 568884d179dSJan Kara } 569884d179dSJan Kara EXPORT_SYMBOL(dquot_scan_active); 570884d179dSJan Kara 571884d179dSJan Kara int vfs_quota_sync(struct super_block *sb, int type) 572884d179dSJan Kara { 573884d179dSJan Kara struct list_head *dirty; 574884d179dSJan Kara struct dquot *dquot; 575884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 576884d179dSJan Kara int cnt; 577884d179dSJan Kara 578884d179dSJan Kara mutex_lock(&dqopt->dqonoff_mutex); 579884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 580884d179dSJan Kara if (type != -1 && cnt != type) 581884d179dSJan Kara continue; 582884d179dSJan Kara if (!sb_has_quota_active(sb, cnt)) 583884d179dSJan Kara continue; 584884d179dSJan Kara spin_lock(&dq_list_lock); 585884d179dSJan Kara dirty = &dqopt->info[cnt].dqi_dirty_list; 586884d179dSJan Kara while (!list_empty(dirty)) { 587268157baSJan Kara dquot = list_first_entry(dirty, struct dquot, 588268157baSJan Kara dq_dirty); 589884d179dSJan Kara /* Dirty and inactive can be only bad dquot... */ 590884d179dSJan Kara if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { 591884d179dSJan Kara clear_dquot_dirty(dquot); 592884d179dSJan Kara continue; 593884d179dSJan Kara } 594884d179dSJan Kara /* Now we have active dquot from which someone is 595884d179dSJan Kara * holding reference so we can safely just increase 596884d179dSJan Kara * use count */ 597884d179dSJan Kara atomic_inc(&dquot->dq_count); 598884d179dSJan Kara dqstats.lookups++; 599884d179dSJan Kara spin_unlock(&dq_list_lock); 600884d179dSJan Kara sb->dq_op->write_dquot(dquot); 601884d179dSJan Kara dqput(dquot); 602884d179dSJan Kara spin_lock(&dq_list_lock); 603884d179dSJan Kara } 604884d179dSJan Kara spin_unlock(&dq_list_lock); 605884d179dSJan Kara } 606884d179dSJan Kara 607884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 608884d179dSJan Kara if ((cnt == type || type == -1) && sb_has_quota_active(sb, cnt) 609884d179dSJan Kara && info_dirty(&dqopt->info[cnt])) 610884d179dSJan Kara sb->dq_op->write_info(sb, cnt); 611884d179dSJan Kara spin_lock(&dq_list_lock); 612884d179dSJan Kara dqstats.syncs++; 613884d179dSJan Kara spin_unlock(&dq_list_lock); 614884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 615884d179dSJan Kara 616884d179dSJan Kara return 0; 617884d179dSJan Kara } 618884d179dSJan Kara EXPORT_SYMBOL(vfs_quota_sync); 619884d179dSJan Kara 620884d179dSJan Kara /* Free unused dquots from cache */ 621884d179dSJan Kara static void prune_dqcache(int count) 622884d179dSJan Kara { 623884d179dSJan Kara struct list_head *head; 624884d179dSJan Kara struct dquot *dquot; 625884d179dSJan Kara 626884d179dSJan Kara head = free_dquots.prev; 627884d179dSJan Kara while (head != &free_dquots && count) { 628884d179dSJan Kara dquot = list_entry(head, struct dquot, dq_free); 629884d179dSJan Kara remove_dquot_hash(dquot); 630884d179dSJan Kara remove_free_dquot(dquot); 631884d179dSJan Kara remove_inuse(dquot); 632884d179dSJan Kara do_destroy_dquot(dquot); 633884d179dSJan Kara count--; 634884d179dSJan Kara head = free_dquots.prev; 635884d179dSJan Kara } 636884d179dSJan Kara } 637884d179dSJan Kara 638884d179dSJan Kara /* 639884d179dSJan Kara * This is called from kswapd when we think we need some 640884d179dSJan Kara * more memory 641884d179dSJan Kara */ 642884d179dSJan Kara 643884d179dSJan Kara static int shrink_dqcache_memory(int nr, gfp_t gfp_mask) 644884d179dSJan Kara { 645884d179dSJan Kara if (nr) { 646884d179dSJan Kara spin_lock(&dq_list_lock); 647884d179dSJan Kara prune_dqcache(nr); 648884d179dSJan Kara spin_unlock(&dq_list_lock); 649884d179dSJan Kara } 650884d179dSJan Kara return (dqstats.free_dquots / 100) * sysctl_vfs_cache_pressure; 651884d179dSJan Kara } 652884d179dSJan Kara 653884d179dSJan Kara static struct shrinker dqcache_shrinker = { 654884d179dSJan Kara .shrink = shrink_dqcache_memory, 655884d179dSJan Kara .seeks = DEFAULT_SEEKS, 656884d179dSJan Kara }; 657884d179dSJan Kara 658884d179dSJan Kara /* 659884d179dSJan Kara * Put reference to dquot 660884d179dSJan Kara * NOTE: If you change this function please check whether dqput_blocks() works right... 661884d179dSJan Kara */ 662884d179dSJan Kara void dqput(struct dquot *dquot) 663884d179dSJan Kara { 664884d179dSJan Kara int ret; 665884d179dSJan Kara 666884d179dSJan Kara if (!dquot) 667884d179dSJan Kara return; 668884d179dSJan Kara #ifdef __DQUOT_PARANOIA 669884d179dSJan Kara if (!atomic_read(&dquot->dq_count)) { 670884d179dSJan Kara printk("VFS: dqput: trying to free free dquot\n"); 671884d179dSJan Kara printk("VFS: device %s, dquot of %s %d\n", 672884d179dSJan Kara dquot->dq_sb->s_id, 673884d179dSJan Kara quotatypes[dquot->dq_type], 674884d179dSJan Kara dquot->dq_id); 675884d179dSJan Kara BUG(); 676884d179dSJan Kara } 677884d179dSJan Kara #endif 678884d179dSJan Kara 679884d179dSJan Kara spin_lock(&dq_list_lock); 680884d179dSJan Kara dqstats.drops++; 681884d179dSJan Kara spin_unlock(&dq_list_lock); 682884d179dSJan Kara we_slept: 683884d179dSJan Kara spin_lock(&dq_list_lock); 684884d179dSJan Kara if (atomic_read(&dquot->dq_count) > 1) { 685884d179dSJan Kara /* We have more than one user... nothing to do */ 686884d179dSJan Kara atomic_dec(&dquot->dq_count); 687884d179dSJan Kara /* Releasing dquot during quotaoff phase? */ 688884d179dSJan Kara if (!sb_has_quota_active(dquot->dq_sb, dquot->dq_type) && 689884d179dSJan Kara atomic_read(&dquot->dq_count) == 1) 690884d179dSJan Kara wake_up(&dquot->dq_wait_unused); 691884d179dSJan Kara spin_unlock(&dq_list_lock); 692884d179dSJan Kara return; 693884d179dSJan Kara } 694884d179dSJan Kara /* Need to release dquot? */ 695884d179dSJan Kara if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && dquot_dirty(dquot)) { 696884d179dSJan Kara spin_unlock(&dq_list_lock); 697884d179dSJan Kara /* Commit dquot before releasing */ 698884d179dSJan Kara ret = dquot->dq_sb->dq_op->write_dquot(dquot); 699884d179dSJan Kara if (ret < 0) { 700884d179dSJan Kara printk(KERN_ERR "VFS: cannot write quota structure on " 701884d179dSJan Kara "device %s (error %d). Quota may get out of " 702884d179dSJan Kara "sync!\n", dquot->dq_sb->s_id, ret); 703884d179dSJan Kara /* 704884d179dSJan Kara * We clear dirty bit anyway, so that we avoid 705884d179dSJan Kara * infinite loop here 706884d179dSJan Kara */ 707884d179dSJan Kara spin_lock(&dq_list_lock); 708884d179dSJan Kara clear_dquot_dirty(dquot); 709884d179dSJan Kara spin_unlock(&dq_list_lock); 710884d179dSJan Kara } 711884d179dSJan Kara goto we_slept; 712884d179dSJan Kara } 713884d179dSJan Kara /* Clear flag in case dquot was inactive (something bad happened) */ 714884d179dSJan Kara clear_dquot_dirty(dquot); 715884d179dSJan Kara if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { 716884d179dSJan Kara spin_unlock(&dq_list_lock); 717884d179dSJan Kara dquot->dq_sb->dq_op->release_dquot(dquot); 718884d179dSJan Kara goto we_slept; 719884d179dSJan Kara } 720884d179dSJan Kara atomic_dec(&dquot->dq_count); 721884d179dSJan Kara #ifdef __DQUOT_PARANOIA 722884d179dSJan Kara /* sanity check */ 723884d179dSJan Kara BUG_ON(!list_empty(&dquot->dq_free)); 724884d179dSJan Kara #endif 725884d179dSJan Kara put_dquot_last(dquot); 726884d179dSJan Kara spin_unlock(&dq_list_lock); 727884d179dSJan Kara } 728884d179dSJan Kara EXPORT_SYMBOL(dqput); 729884d179dSJan Kara 730884d179dSJan Kara struct dquot *dquot_alloc(struct super_block *sb, int type) 731884d179dSJan Kara { 732884d179dSJan Kara return kmem_cache_zalloc(dquot_cachep, GFP_NOFS); 733884d179dSJan Kara } 734884d179dSJan Kara EXPORT_SYMBOL(dquot_alloc); 735884d179dSJan Kara 736884d179dSJan Kara static struct dquot *get_empty_dquot(struct super_block *sb, int type) 737884d179dSJan Kara { 738884d179dSJan Kara struct dquot *dquot; 739884d179dSJan Kara 740884d179dSJan Kara dquot = sb->dq_op->alloc_dquot(sb, type); 741884d179dSJan Kara if(!dquot) 742dd6f3c6dSJan Kara return NULL; 743884d179dSJan Kara 744884d179dSJan Kara mutex_init(&dquot->dq_lock); 745884d179dSJan Kara INIT_LIST_HEAD(&dquot->dq_free); 746884d179dSJan Kara INIT_LIST_HEAD(&dquot->dq_inuse); 747884d179dSJan Kara INIT_HLIST_NODE(&dquot->dq_hash); 748884d179dSJan Kara INIT_LIST_HEAD(&dquot->dq_dirty); 749884d179dSJan Kara init_waitqueue_head(&dquot->dq_wait_unused); 750884d179dSJan Kara dquot->dq_sb = sb; 751884d179dSJan Kara dquot->dq_type = type; 752884d179dSJan Kara atomic_set(&dquot->dq_count, 1); 753884d179dSJan Kara 754884d179dSJan Kara return dquot; 755884d179dSJan Kara } 756884d179dSJan Kara 757884d179dSJan Kara /* 758884d179dSJan Kara * Get reference to dquot 759884d179dSJan Kara * 760884d179dSJan Kara * Locking is slightly tricky here. We are guarded from parallel quotaoff() 761884d179dSJan Kara * destroying our dquot by: 762884d179dSJan Kara * a) checking for quota flags under dq_list_lock and 763884d179dSJan Kara * b) getting a reference to dquot before we release dq_list_lock 764884d179dSJan Kara */ 765884d179dSJan Kara struct dquot *dqget(struct super_block *sb, unsigned int id, int type) 766884d179dSJan Kara { 767884d179dSJan Kara unsigned int hashent = hashfn(sb, id, type); 768dd6f3c6dSJan Kara struct dquot *dquot = NULL, *empty = NULL; 769884d179dSJan Kara 770884d179dSJan Kara if (!sb_has_quota_active(sb, type)) 771dd6f3c6dSJan Kara return NULL; 772884d179dSJan Kara we_slept: 773884d179dSJan Kara spin_lock(&dq_list_lock); 774884d179dSJan Kara spin_lock(&dq_state_lock); 775884d179dSJan Kara if (!sb_has_quota_active(sb, type)) { 776884d179dSJan Kara spin_unlock(&dq_state_lock); 777884d179dSJan Kara spin_unlock(&dq_list_lock); 778884d179dSJan Kara goto out; 779884d179dSJan Kara } 780884d179dSJan Kara spin_unlock(&dq_state_lock); 781884d179dSJan Kara 782dd6f3c6dSJan Kara dquot = find_dquot(hashent, sb, id, type); 783dd6f3c6dSJan Kara if (!dquot) { 784dd6f3c6dSJan Kara if (!empty) { 785884d179dSJan Kara spin_unlock(&dq_list_lock); 786dd6f3c6dSJan Kara empty = get_empty_dquot(sb, type); 787dd6f3c6dSJan Kara if (!empty) 788884d179dSJan Kara schedule(); /* Try to wait for a moment... */ 789884d179dSJan Kara goto we_slept; 790884d179dSJan Kara } 791884d179dSJan Kara dquot = empty; 792dd6f3c6dSJan Kara empty = NULL; 793884d179dSJan Kara dquot->dq_id = id; 794884d179dSJan Kara /* all dquots go on the inuse_list */ 795884d179dSJan Kara put_inuse(dquot); 796884d179dSJan Kara /* hash it first so it can be found */ 797884d179dSJan Kara insert_dquot_hash(dquot); 798884d179dSJan Kara dqstats.lookups++; 799884d179dSJan Kara spin_unlock(&dq_list_lock); 800884d179dSJan Kara } else { 801884d179dSJan Kara if (!atomic_read(&dquot->dq_count)) 802884d179dSJan Kara remove_free_dquot(dquot); 803884d179dSJan Kara atomic_inc(&dquot->dq_count); 804884d179dSJan Kara dqstats.cache_hits++; 805884d179dSJan Kara dqstats.lookups++; 806884d179dSJan Kara spin_unlock(&dq_list_lock); 807884d179dSJan Kara } 808268157baSJan Kara /* Wait for dq_lock - after this we know that either dquot_release() is 809268157baSJan Kara * already finished or it will be canceled due to dq_count > 1 test */ 810884d179dSJan Kara wait_on_dquot(dquot); 811268157baSJan Kara /* Read the dquot / allocate space in quota file */ 812268157baSJan Kara if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && 813268157baSJan Kara sb->dq_op->acquire_dquot(dquot) < 0) { 814884d179dSJan Kara dqput(dquot); 815dd6f3c6dSJan Kara dquot = NULL; 816884d179dSJan Kara goto out; 817884d179dSJan Kara } 818884d179dSJan Kara #ifdef __DQUOT_PARANOIA 819884d179dSJan Kara BUG_ON(!dquot->dq_sb); /* Has somebody invalidated entry under us? */ 820884d179dSJan Kara #endif 821884d179dSJan Kara out: 822884d179dSJan Kara if (empty) 823884d179dSJan Kara do_destroy_dquot(empty); 824884d179dSJan Kara 825884d179dSJan Kara return dquot; 826884d179dSJan Kara } 827884d179dSJan Kara EXPORT_SYMBOL(dqget); 828884d179dSJan Kara 829884d179dSJan Kara static int dqinit_needed(struct inode *inode, int type) 830884d179dSJan Kara { 831884d179dSJan Kara int cnt; 832884d179dSJan Kara 833884d179dSJan Kara if (IS_NOQUOTA(inode)) 834884d179dSJan Kara return 0; 835884d179dSJan Kara if (type != -1) 836dd6f3c6dSJan Kara return !inode->i_dquot[type]; 837884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 838dd6f3c6dSJan Kara if (!inode->i_dquot[cnt]) 839884d179dSJan Kara return 1; 840884d179dSJan Kara return 0; 841884d179dSJan Kara } 842884d179dSJan Kara 843884d179dSJan Kara /* This routine is guarded by dqonoff_mutex mutex */ 844884d179dSJan Kara static void add_dquot_ref(struct super_block *sb, int type) 845884d179dSJan Kara { 846884d179dSJan Kara struct inode *inode, *old_inode = NULL; 847884d179dSJan Kara 848884d179dSJan Kara spin_lock(&inode_lock); 849884d179dSJan Kara list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { 850b6fac63cSWu Fengguang if (inode->i_state & (I_FREEING|I_CLEAR|I_WILL_FREE|I_NEW)) 8513ae5080fSLinus Torvalds continue; 852884d179dSJan Kara if (!atomic_read(&inode->i_writecount)) 853884d179dSJan Kara continue; 854884d179dSJan Kara if (!dqinit_needed(inode, type)) 855884d179dSJan Kara continue; 856884d179dSJan Kara 857884d179dSJan Kara __iget(inode); 858884d179dSJan Kara spin_unlock(&inode_lock); 859884d179dSJan Kara 860884d179dSJan Kara iput(old_inode); 861884d179dSJan Kara sb->dq_op->initialize(inode, type); 862884d179dSJan Kara /* We hold a reference to 'inode' so it couldn't have been 863884d179dSJan Kara * removed from s_inodes list while we dropped the inode_lock. 864884d179dSJan Kara * We cannot iput the inode now as we can be holding the last 865884d179dSJan Kara * reference and we cannot iput it under inode_lock. So we 866884d179dSJan Kara * keep the reference and iput it later. */ 867884d179dSJan Kara old_inode = inode; 868884d179dSJan Kara spin_lock(&inode_lock); 869884d179dSJan Kara } 870884d179dSJan Kara spin_unlock(&inode_lock); 871884d179dSJan Kara iput(old_inode); 872884d179dSJan Kara } 873884d179dSJan Kara 874268157baSJan Kara /* 875268157baSJan Kara * Return 0 if dqput() won't block. 876268157baSJan Kara * (note that 1 doesn't necessarily mean blocking) 877268157baSJan Kara */ 878884d179dSJan Kara static inline int dqput_blocks(struct dquot *dquot) 879884d179dSJan Kara { 880884d179dSJan Kara if (atomic_read(&dquot->dq_count) <= 1) 881884d179dSJan Kara return 1; 882884d179dSJan Kara return 0; 883884d179dSJan Kara } 884884d179dSJan Kara 885268157baSJan Kara /* 886268157baSJan Kara * Remove references to dquots from inode and add dquot to list for freeing 887268157baSJan Kara * if we have the last referece to dquot 888268157baSJan Kara * We can't race with anybody because we hold dqptr_sem for writing... 889268157baSJan Kara */ 890884d179dSJan Kara static int remove_inode_dquot_ref(struct inode *inode, int type, 891884d179dSJan Kara struct list_head *tofree_head) 892884d179dSJan Kara { 893884d179dSJan Kara struct dquot *dquot = inode->i_dquot[type]; 894884d179dSJan Kara 895dd6f3c6dSJan Kara inode->i_dquot[type] = NULL; 896dd6f3c6dSJan Kara if (dquot) { 897884d179dSJan Kara if (dqput_blocks(dquot)) { 898884d179dSJan Kara #ifdef __DQUOT_PARANOIA 899884d179dSJan Kara if (atomic_read(&dquot->dq_count) != 1) 900884d179dSJan Kara printk(KERN_WARNING "VFS: Adding dquot with dq_count %d to dispose list.\n", atomic_read(&dquot->dq_count)); 901884d179dSJan Kara #endif 902884d179dSJan Kara spin_lock(&dq_list_lock); 903268157baSJan Kara /* As dquot must have currently users it can't be on 904268157baSJan Kara * the free list... */ 905268157baSJan Kara list_add(&dquot->dq_free, tofree_head); 906884d179dSJan Kara spin_unlock(&dq_list_lock); 907884d179dSJan Kara return 1; 908884d179dSJan Kara } 909884d179dSJan Kara else 910884d179dSJan Kara dqput(dquot); /* We have guaranteed we won't block */ 911884d179dSJan Kara } 912884d179dSJan Kara return 0; 913884d179dSJan Kara } 914884d179dSJan Kara 915268157baSJan Kara /* 916268157baSJan Kara * Free list of dquots 917268157baSJan Kara * Dquots are removed from inodes and no new references can be got so we are 918268157baSJan Kara * the only ones holding reference 919268157baSJan Kara */ 920884d179dSJan Kara static void put_dquot_list(struct list_head *tofree_head) 921884d179dSJan Kara { 922884d179dSJan Kara struct list_head *act_head; 923884d179dSJan Kara struct dquot *dquot; 924884d179dSJan Kara 925884d179dSJan Kara act_head = tofree_head->next; 926884d179dSJan Kara while (act_head != tofree_head) { 927884d179dSJan Kara dquot = list_entry(act_head, struct dquot, dq_free); 928884d179dSJan Kara act_head = act_head->next; 929268157baSJan Kara /* Remove dquot from the list so we won't have problems... */ 930268157baSJan Kara list_del_init(&dquot->dq_free); 931884d179dSJan Kara dqput(dquot); 932884d179dSJan Kara } 933884d179dSJan Kara } 934884d179dSJan Kara 935884d179dSJan Kara static void remove_dquot_ref(struct super_block *sb, int type, 936884d179dSJan Kara struct list_head *tofree_head) 937884d179dSJan Kara { 938884d179dSJan Kara struct inode *inode; 939884d179dSJan Kara 940884d179dSJan Kara spin_lock(&inode_lock); 941884d179dSJan Kara list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { 9423ae5080fSLinus Torvalds /* 9433ae5080fSLinus Torvalds * We have to scan also I_NEW inodes because they can already 9443ae5080fSLinus Torvalds * have quota pointer initialized. Luckily, we need to touch 9453ae5080fSLinus Torvalds * only quota pointers and these have separate locking 9463ae5080fSLinus Torvalds * (dqptr_sem). 9473ae5080fSLinus Torvalds */ 948884d179dSJan Kara if (!IS_NOQUOTA(inode)) 949884d179dSJan Kara remove_inode_dquot_ref(inode, type, tofree_head); 950884d179dSJan Kara } 951884d179dSJan Kara spin_unlock(&inode_lock); 952884d179dSJan Kara } 953884d179dSJan Kara 954884d179dSJan Kara /* Gather all references from inodes and drop them */ 955884d179dSJan Kara static void drop_dquot_ref(struct super_block *sb, int type) 956884d179dSJan Kara { 957884d179dSJan Kara LIST_HEAD(tofree_head); 958884d179dSJan Kara 959884d179dSJan Kara if (sb->dq_op) { 960884d179dSJan Kara down_write(&sb_dqopt(sb)->dqptr_sem); 961884d179dSJan Kara remove_dquot_ref(sb, type, &tofree_head); 962884d179dSJan Kara up_write(&sb_dqopt(sb)->dqptr_sem); 963884d179dSJan Kara put_dquot_list(&tofree_head); 964884d179dSJan Kara } 965884d179dSJan Kara } 966884d179dSJan Kara 967884d179dSJan Kara static inline void dquot_incr_inodes(struct dquot *dquot, qsize_t number) 968884d179dSJan Kara { 969884d179dSJan Kara dquot->dq_dqb.dqb_curinodes += number; 970884d179dSJan Kara } 971884d179dSJan Kara 972884d179dSJan Kara static inline void dquot_incr_space(struct dquot *dquot, qsize_t number) 973884d179dSJan Kara { 974884d179dSJan Kara dquot->dq_dqb.dqb_curspace += number; 975884d179dSJan Kara } 976884d179dSJan Kara 977884d179dSJan Kara static inline void dquot_resv_space(struct dquot *dquot, qsize_t number) 978884d179dSJan Kara { 979884d179dSJan Kara dquot->dq_dqb.dqb_rsvspace += number; 980884d179dSJan Kara } 981884d179dSJan Kara 982884d179dSJan Kara /* 983884d179dSJan Kara * Claim reserved quota space 984884d179dSJan Kara */ 985884d179dSJan Kara static void dquot_claim_reserved_space(struct dquot *dquot, 986884d179dSJan Kara qsize_t number) 987884d179dSJan Kara { 988884d179dSJan Kara WARN_ON(dquot->dq_dqb.dqb_rsvspace < number); 989884d179dSJan Kara dquot->dq_dqb.dqb_curspace += number; 990884d179dSJan Kara dquot->dq_dqb.dqb_rsvspace -= number; 991884d179dSJan Kara } 992884d179dSJan Kara 993884d179dSJan Kara static inline 994884d179dSJan Kara void dquot_free_reserved_space(struct dquot *dquot, qsize_t number) 995884d179dSJan Kara { 996884d179dSJan Kara dquot->dq_dqb.dqb_rsvspace -= number; 997884d179dSJan Kara } 998884d179dSJan Kara 9997a2435d8SJan Kara static void dquot_decr_inodes(struct dquot *dquot, qsize_t number) 1000884d179dSJan Kara { 1001884d179dSJan Kara if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE || 1002884d179dSJan Kara dquot->dq_dqb.dqb_curinodes >= number) 1003884d179dSJan Kara dquot->dq_dqb.dqb_curinodes -= number; 1004884d179dSJan Kara else 1005884d179dSJan Kara dquot->dq_dqb.dqb_curinodes = 0; 1006884d179dSJan Kara if (dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit) 1007884d179dSJan Kara dquot->dq_dqb.dqb_itime = (time_t) 0; 1008884d179dSJan Kara clear_bit(DQ_INODES_B, &dquot->dq_flags); 1009884d179dSJan Kara } 1010884d179dSJan Kara 10117a2435d8SJan Kara static void dquot_decr_space(struct dquot *dquot, qsize_t number) 1012884d179dSJan Kara { 1013884d179dSJan Kara if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE || 1014884d179dSJan Kara dquot->dq_dqb.dqb_curspace >= number) 1015884d179dSJan Kara dquot->dq_dqb.dqb_curspace -= number; 1016884d179dSJan Kara else 1017884d179dSJan Kara dquot->dq_dqb.dqb_curspace = 0; 1018884d179dSJan Kara if (dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit) 1019884d179dSJan Kara dquot->dq_dqb.dqb_btime = (time_t) 0; 1020884d179dSJan Kara clear_bit(DQ_BLKS_B, &dquot->dq_flags); 1021884d179dSJan Kara } 1022884d179dSJan Kara 1023884d179dSJan Kara static int warning_issued(struct dquot *dquot, const int warntype) 1024884d179dSJan Kara { 1025884d179dSJan Kara int flag = (warntype == QUOTA_NL_BHARDWARN || 1026884d179dSJan Kara warntype == QUOTA_NL_BSOFTLONGWARN) ? DQ_BLKS_B : 1027884d179dSJan Kara ((warntype == QUOTA_NL_IHARDWARN || 1028884d179dSJan Kara warntype == QUOTA_NL_ISOFTLONGWARN) ? DQ_INODES_B : 0); 1029884d179dSJan Kara 1030884d179dSJan Kara if (!flag) 1031884d179dSJan Kara return 0; 1032884d179dSJan Kara return test_and_set_bit(flag, &dquot->dq_flags); 1033884d179dSJan Kara } 1034884d179dSJan Kara 1035884d179dSJan Kara #ifdef CONFIG_PRINT_QUOTA_WARNING 1036884d179dSJan Kara static int flag_print_warnings = 1; 1037884d179dSJan Kara 10387a2435d8SJan Kara static int need_print_warning(struct dquot *dquot) 1039884d179dSJan Kara { 1040884d179dSJan Kara if (!flag_print_warnings) 1041884d179dSJan Kara return 0; 1042884d179dSJan Kara 1043884d179dSJan Kara switch (dquot->dq_type) { 1044884d179dSJan Kara case USRQUOTA: 1045884d179dSJan Kara return current_fsuid() == dquot->dq_id; 1046884d179dSJan Kara case GRPQUOTA: 1047884d179dSJan Kara return in_group_p(dquot->dq_id); 1048884d179dSJan Kara } 1049884d179dSJan Kara return 0; 1050884d179dSJan Kara } 1051884d179dSJan Kara 1052884d179dSJan Kara /* Print warning to user which exceeded quota */ 1053884d179dSJan Kara static void print_warning(struct dquot *dquot, const int warntype) 1054884d179dSJan Kara { 1055884d179dSJan Kara char *msg = NULL; 1056884d179dSJan Kara struct tty_struct *tty; 1057884d179dSJan Kara 1058884d179dSJan Kara if (warntype == QUOTA_NL_IHARDBELOW || 1059884d179dSJan Kara warntype == QUOTA_NL_ISOFTBELOW || 1060884d179dSJan Kara warntype == QUOTA_NL_BHARDBELOW || 1061884d179dSJan Kara warntype == QUOTA_NL_BSOFTBELOW || !need_print_warning(dquot)) 1062884d179dSJan Kara return; 1063884d179dSJan Kara 1064884d179dSJan Kara tty = get_current_tty(); 1065884d179dSJan Kara if (!tty) 1066884d179dSJan Kara return; 1067884d179dSJan Kara tty_write_message(tty, dquot->dq_sb->s_id); 1068884d179dSJan Kara if (warntype == QUOTA_NL_ISOFTWARN || warntype == QUOTA_NL_BSOFTWARN) 1069884d179dSJan Kara tty_write_message(tty, ": warning, "); 1070884d179dSJan Kara else 1071884d179dSJan Kara tty_write_message(tty, ": write failed, "); 1072884d179dSJan Kara tty_write_message(tty, quotatypes[dquot->dq_type]); 1073884d179dSJan Kara switch (warntype) { 1074884d179dSJan Kara case QUOTA_NL_IHARDWARN: 1075884d179dSJan Kara msg = " file limit reached.\r\n"; 1076884d179dSJan Kara break; 1077884d179dSJan Kara case QUOTA_NL_ISOFTLONGWARN: 1078884d179dSJan Kara msg = " file quota exceeded too long.\r\n"; 1079884d179dSJan Kara break; 1080884d179dSJan Kara case QUOTA_NL_ISOFTWARN: 1081884d179dSJan Kara msg = " file quota exceeded.\r\n"; 1082884d179dSJan Kara break; 1083884d179dSJan Kara case QUOTA_NL_BHARDWARN: 1084884d179dSJan Kara msg = " block limit reached.\r\n"; 1085884d179dSJan Kara break; 1086884d179dSJan Kara case QUOTA_NL_BSOFTLONGWARN: 1087884d179dSJan Kara msg = " block quota exceeded too long.\r\n"; 1088884d179dSJan Kara break; 1089884d179dSJan Kara case QUOTA_NL_BSOFTWARN: 1090884d179dSJan Kara msg = " block quota exceeded.\r\n"; 1091884d179dSJan Kara break; 1092884d179dSJan Kara } 1093884d179dSJan Kara tty_write_message(tty, msg); 1094884d179dSJan Kara tty_kref_put(tty); 1095884d179dSJan Kara } 1096884d179dSJan Kara #endif 1097884d179dSJan Kara 1098884d179dSJan Kara /* 1099884d179dSJan Kara * Write warnings to the console and send warning messages over netlink. 1100884d179dSJan Kara * 1101884d179dSJan Kara * Note that this function can sleep. 1102884d179dSJan Kara */ 11037a2435d8SJan Kara static void flush_warnings(struct dquot *const *dquots, char *warntype) 1104884d179dSJan Kara { 110586e931a3SSteven Whitehouse struct dquot *dq; 1106884d179dSJan Kara int i; 1107884d179dSJan Kara 110886e931a3SSteven Whitehouse for (i = 0; i < MAXQUOTAS; i++) { 110986e931a3SSteven Whitehouse dq = dquots[i]; 111086e931a3SSteven Whitehouse if (dq && warntype[i] != QUOTA_NL_NOWARN && 111186e931a3SSteven Whitehouse !warning_issued(dq, warntype[i])) { 1112884d179dSJan Kara #ifdef CONFIG_PRINT_QUOTA_WARNING 111386e931a3SSteven Whitehouse print_warning(dq, warntype[i]); 1114884d179dSJan Kara #endif 111586e931a3SSteven Whitehouse quota_send_warning(dq->dq_type, dq->dq_id, 111686e931a3SSteven Whitehouse dq->dq_sb->s_dev, warntype[i]); 111786e931a3SSteven Whitehouse } 1118884d179dSJan Kara } 1119884d179dSJan Kara } 1120884d179dSJan Kara 11217a2435d8SJan Kara static int ignore_hardlimit(struct dquot *dquot) 1122884d179dSJan Kara { 1123884d179dSJan Kara struct mem_dqinfo *info = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_type]; 1124884d179dSJan Kara 1125884d179dSJan Kara return capable(CAP_SYS_RESOURCE) && 1126268157baSJan Kara (info->dqi_format->qf_fmt_id != QFMT_VFS_OLD || 1127268157baSJan Kara !(info->dqi_flags & V1_DQF_RSQUASH)); 1128884d179dSJan Kara } 1129884d179dSJan Kara 1130884d179dSJan Kara /* needs dq_data_lock */ 1131884d179dSJan Kara static int check_idq(struct dquot *dquot, qsize_t inodes, char *warntype) 1132884d179dSJan Kara { 1133268157baSJan Kara qsize_t newinodes = dquot->dq_dqb.dqb_curinodes + inodes; 1134268157baSJan Kara 1135884d179dSJan Kara *warntype = QUOTA_NL_NOWARN; 1136884d179dSJan Kara if (!sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_type) || 1137884d179dSJan Kara test_bit(DQ_FAKE_B, &dquot->dq_flags)) 1138884d179dSJan Kara return QUOTA_OK; 1139884d179dSJan Kara 1140884d179dSJan Kara if (dquot->dq_dqb.dqb_ihardlimit && 1141268157baSJan Kara newinodes > dquot->dq_dqb.dqb_ihardlimit && 1142884d179dSJan Kara !ignore_hardlimit(dquot)) { 1143884d179dSJan Kara *warntype = QUOTA_NL_IHARDWARN; 1144884d179dSJan Kara return NO_QUOTA; 1145884d179dSJan Kara } 1146884d179dSJan Kara 1147884d179dSJan Kara if (dquot->dq_dqb.dqb_isoftlimit && 1148268157baSJan Kara newinodes > dquot->dq_dqb.dqb_isoftlimit && 1149268157baSJan Kara dquot->dq_dqb.dqb_itime && 1150268157baSJan Kara get_seconds() >= dquot->dq_dqb.dqb_itime && 1151884d179dSJan Kara !ignore_hardlimit(dquot)) { 1152884d179dSJan Kara *warntype = QUOTA_NL_ISOFTLONGWARN; 1153884d179dSJan Kara return NO_QUOTA; 1154884d179dSJan Kara } 1155884d179dSJan Kara 1156884d179dSJan Kara if (dquot->dq_dqb.dqb_isoftlimit && 1157268157baSJan Kara newinodes > dquot->dq_dqb.dqb_isoftlimit && 1158884d179dSJan Kara dquot->dq_dqb.dqb_itime == 0) { 1159884d179dSJan Kara *warntype = QUOTA_NL_ISOFTWARN; 1160268157baSJan Kara dquot->dq_dqb.dqb_itime = get_seconds() + 1161268157baSJan Kara sb_dqopt(dquot->dq_sb)->info[dquot->dq_type].dqi_igrace; 1162884d179dSJan Kara } 1163884d179dSJan Kara 1164884d179dSJan Kara return QUOTA_OK; 1165884d179dSJan Kara } 1166884d179dSJan Kara 1167884d179dSJan Kara /* needs dq_data_lock */ 1168884d179dSJan Kara static int check_bdq(struct dquot *dquot, qsize_t space, int prealloc, char *warntype) 1169884d179dSJan Kara { 1170884d179dSJan Kara qsize_t tspace; 1171268157baSJan Kara struct super_block *sb = dquot->dq_sb; 1172884d179dSJan Kara 1173884d179dSJan Kara *warntype = QUOTA_NL_NOWARN; 1174268157baSJan Kara if (!sb_has_quota_limits_enabled(sb, dquot->dq_type) || 1175884d179dSJan Kara test_bit(DQ_FAKE_B, &dquot->dq_flags)) 1176884d179dSJan Kara return QUOTA_OK; 1177884d179dSJan Kara 1178884d179dSJan Kara tspace = dquot->dq_dqb.dqb_curspace + dquot->dq_dqb.dqb_rsvspace 1179884d179dSJan Kara + space; 1180884d179dSJan Kara 1181884d179dSJan Kara if (dquot->dq_dqb.dqb_bhardlimit && 1182884d179dSJan Kara tspace > dquot->dq_dqb.dqb_bhardlimit && 1183884d179dSJan Kara !ignore_hardlimit(dquot)) { 1184884d179dSJan Kara if (!prealloc) 1185884d179dSJan Kara *warntype = QUOTA_NL_BHARDWARN; 1186884d179dSJan Kara return NO_QUOTA; 1187884d179dSJan Kara } 1188884d179dSJan Kara 1189884d179dSJan Kara if (dquot->dq_dqb.dqb_bsoftlimit && 1190884d179dSJan Kara tspace > dquot->dq_dqb.dqb_bsoftlimit && 1191268157baSJan Kara dquot->dq_dqb.dqb_btime && 1192268157baSJan Kara get_seconds() >= dquot->dq_dqb.dqb_btime && 1193884d179dSJan Kara !ignore_hardlimit(dquot)) { 1194884d179dSJan Kara if (!prealloc) 1195884d179dSJan Kara *warntype = QUOTA_NL_BSOFTLONGWARN; 1196884d179dSJan Kara return NO_QUOTA; 1197884d179dSJan Kara } 1198884d179dSJan Kara 1199884d179dSJan Kara if (dquot->dq_dqb.dqb_bsoftlimit && 1200884d179dSJan Kara tspace > dquot->dq_dqb.dqb_bsoftlimit && 1201884d179dSJan Kara dquot->dq_dqb.dqb_btime == 0) { 1202884d179dSJan Kara if (!prealloc) { 1203884d179dSJan Kara *warntype = QUOTA_NL_BSOFTWARN; 1204268157baSJan Kara dquot->dq_dqb.dqb_btime = get_seconds() + 1205268157baSJan Kara sb_dqopt(sb)->info[dquot->dq_type].dqi_bgrace; 1206884d179dSJan Kara } 1207884d179dSJan Kara else 1208884d179dSJan Kara /* 1209884d179dSJan Kara * We don't allow preallocation to exceed softlimit so exceeding will 1210884d179dSJan Kara * be always printed 1211884d179dSJan Kara */ 1212884d179dSJan Kara return NO_QUOTA; 1213884d179dSJan Kara } 1214884d179dSJan Kara 1215884d179dSJan Kara return QUOTA_OK; 1216884d179dSJan Kara } 1217884d179dSJan Kara 1218884d179dSJan Kara static int info_idq_free(struct dquot *dquot, qsize_t inodes) 1219884d179dSJan Kara { 1220268157baSJan Kara qsize_t newinodes; 1221268157baSJan Kara 1222884d179dSJan Kara if (test_bit(DQ_FAKE_B, &dquot->dq_flags) || 1223884d179dSJan Kara dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit || 1224884d179dSJan Kara !sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_type)) 1225884d179dSJan Kara return QUOTA_NL_NOWARN; 1226884d179dSJan Kara 1227268157baSJan Kara newinodes = dquot->dq_dqb.dqb_curinodes - inodes; 1228268157baSJan Kara if (newinodes <= dquot->dq_dqb.dqb_isoftlimit) 1229884d179dSJan Kara return QUOTA_NL_ISOFTBELOW; 1230884d179dSJan Kara if (dquot->dq_dqb.dqb_curinodes >= dquot->dq_dqb.dqb_ihardlimit && 1231268157baSJan Kara newinodes < dquot->dq_dqb.dqb_ihardlimit) 1232884d179dSJan Kara return QUOTA_NL_IHARDBELOW; 1233884d179dSJan Kara return QUOTA_NL_NOWARN; 1234884d179dSJan Kara } 1235884d179dSJan Kara 1236884d179dSJan Kara static int info_bdq_free(struct dquot *dquot, qsize_t space) 1237884d179dSJan Kara { 1238884d179dSJan Kara if (test_bit(DQ_FAKE_B, &dquot->dq_flags) || 1239884d179dSJan Kara dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit) 1240884d179dSJan Kara return QUOTA_NL_NOWARN; 1241884d179dSJan Kara 1242884d179dSJan Kara if (dquot->dq_dqb.dqb_curspace - space <= dquot->dq_dqb.dqb_bsoftlimit) 1243884d179dSJan Kara return QUOTA_NL_BSOFTBELOW; 1244884d179dSJan Kara if (dquot->dq_dqb.dqb_curspace >= dquot->dq_dqb.dqb_bhardlimit && 1245884d179dSJan Kara dquot->dq_dqb.dqb_curspace - space < dquot->dq_dqb.dqb_bhardlimit) 1246884d179dSJan Kara return QUOTA_NL_BHARDBELOW; 1247884d179dSJan Kara return QUOTA_NL_NOWARN; 1248884d179dSJan Kara } 1249884d179dSJan Kara /* 1250884d179dSJan Kara * Initialize quota pointers in inode 1251884d179dSJan Kara * We do things in a bit complicated way but by that we avoid calling 1252884d179dSJan Kara * dqget() and thus filesystem callbacks under dqptr_sem. 1253884d179dSJan Kara */ 1254884d179dSJan Kara int dquot_initialize(struct inode *inode, int type) 1255884d179dSJan Kara { 1256884d179dSJan Kara unsigned int id = 0; 1257884d179dSJan Kara int cnt, ret = 0; 1258dd6f3c6dSJan Kara struct dquot *got[MAXQUOTAS] = { NULL, NULL }; 1259884d179dSJan Kara struct super_block *sb = inode->i_sb; 1260884d179dSJan Kara 1261884d179dSJan Kara /* First test before acquiring mutex - solves deadlocks when we 1262884d179dSJan Kara * re-enter the quota code and are already holding the mutex */ 1263884d179dSJan Kara if (IS_NOQUOTA(inode)) 1264884d179dSJan Kara return 0; 1265884d179dSJan Kara 1266884d179dSJan Kara /* First get references to structures we might need. */ 1267884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1268884d179dSJan Kara if (type != -1 && cnt != type) 1269884d179dSJan Kara continue; 1270884d179dSJan Kara switch (cnt) { 1271884d179dSJan Kara case USRQUOTA: 1272884d179dSJan Kara id = inode->i_uid; 1273884d179dSJan Kara break; 1274884d179dSJan Kara case GRPQUOTA: 1275884d179dSJan Kara id = inode->i_gid; 1276884d179dSJan Kara break; 1277884d179dSJan Kara } 1278884d179dSJan Kara got[cnt] = dqget(sb, id, cnt); 1279884d179dSJan Kara } 1280884d179dSJan Kara 1281884d179dSJan Kara down_write(&sb_dqopt(sb)->dqptr_sem); 1282884d179dSJan Kara if (IS_NOQUOTA(inode)) 1283884d179dSJan Kara goto out_err; 1284884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1285884d179dSJan Kara if (type != -1 && cnt != type) 1286884d179dSJan Kara continue; 1287884d179dSJan Kara /* Avoid races with quotaoff() */ 1288884d179dSJan Kara if (!sb_has_quota_active(sb, cnt)) 1289884d179dSJan Kara continue; 1290dd6f3c6dSJan Kara if (!inode->i_dquot[cnt]) { 1291884d179dSJan Kara inode->i_dquot[cnt] = got[cnt]; 1292dd6f3c6dSJan Kara got[cnt] = NULL; 1293884d179dSJan Kara } 1294884d179dSJan Kara } 1295884d179dSJan Kara out_err: 1296884d179dSJan Kara up_write(&sb_dqopt(sb)->dqptr_sem); 1297884d179dSJan Kara /* Drop unused references */ 1298dc52dd3aSDmitry Monakhov dqput_all(got); 1299884d179dSJan Kara return ret; 1300884d179dSJan Kara } 1301884d179dSJan Kara EXPORT_SYMBOL(dquot_initialize); 1302884d179dSJan Kara 1303884d179dSJan Kara /* 1304884d179dSJan Kara * Release all quotas referenced by inode 1305884d179dSJan Kara */ 1306884d179dSJan Kara int dquot_drop(struct inode *inode) 1307884d179dSJan Kara { 1308884d179dSJan Kara int cnt; 1309884d179dSJan Kara struct dquot *put[MAXQUOTAS]; 1310884d179dSJan Kara 1311884d179dSJan Kara down_write(&sb_dqopt(inode->i_sb)->dqptr_sem); 1312884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1313884d179dSJan Kara put[cnt] = inode->i_dquot[cnt]; 1314dd6f3c6dSJan Kara inode->i_dquot[cnt] = NULL; 1315884d179dSJan Kara } 1316884d179dSJan Kara up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); 1317dc52dd3aSDmitry Monakhov dqput_all(put); 1318884d179dSJan Kara return 0; 1319884d179dSJan Kara } 1320884d179dSJan Kara EXPORT_SYMBOL(dquot_drop); 1321884d179dSJan Kara 1322884d179dSJan Kara /* Wrapper to remove references to quota structures from inode */ 1323884d179dSJan Kara void vfs_dq_drop(struct inode *inode) 1324884d179dSJan Kara { 1325884d179dSJan Kara /* Here we can get arbitrary inode from clear_inode() so we have 1326884d179dSJan Kara * to be careful. OTOH we don't need locking as quota operations 1327884d179dSJan Kara * are allowed to change only at mount time */ 1328884d179dSJan Kara if (!IS_NOQUOTA(inode) && inode->i_sb && inode->i_sb->dq_op 1329884d179dSJan Kara && inode->i_sb->dq_op->drop) { 1330884d179dSJan Kara int cnt; 1331884d179dSJan Kara /* Test before calling to rule out calls from proc and such 1332884d179dSJan Kara * where we are not allowed to block. Note that this is 1333884d179dSJan Kara * actually reliable test even without the lock - the caller 1334884d179dSJan Kara * must assure that nobody can come after the DQUOT_DROP and 1335884d179dSJan Kara * add quota pointers back anyway */ 1336884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 1337dd6f3c6dSJan Kara if (inode->i_dquot[cnt]) 1338884d179dSJan Kara break; 1339884d179dSJan Kara if (cnt < MAXQUOTAS) 1340884d179dSJan Kara inode->i_sb->dq_op->drop(inode); 1341884d179dSJan Kara } 1342884d179dSJan Kara } 1343884d179dSJan Kara EXPORT_SYMBOL(vfs_dq_drop); 1344884d179dSJan Kara 1345884d179dSJan Kara /* 1346fd8fbfc1SDmitry Monakhov * inode_reserved_space is managed internally by quota, and protected by 1347fd8fbfc1SDmitry Monakhov * i_lock similar to i_blocks+i_bytes. 1348fd8fbfc1SDmitry Monakhov */ 1349fd8fbfc1SDmitry Monakhov static qsize_t *inode_reserved_space(struct inode * inode) 1350fd8fbfc1SDmitry Monakhov { 1351fd8fbfc1SDmitry Monakhov /* Filesystem must explicitly define it's own method in order to use 1352fd8fbfc1SDmitry Monakhov * quota reservation interface */ 1353fd8fbfc1SDmitry Monakhov BUG_ON(!inode->i_sb->dq_op->get_reserved_space); 1354fd8fbfc1SDmitry Monakhov return inode->i_sb->dq_op->get_reserved_space(inode); 1355fd8fbfc1SDmitry Monakhov } 1356fd8fbfc1SDmitry Monakhov 1357*c469070aSDmitry Monakhov void inode_add_rsv_space(struct inode *inode, qsize_t number) 1358fd8fbfc1SDmitry Monakhov { 1359fd8fbfc1SDmitry Monakhov spin_lock(&inode->i_lock); 1360fd8fbfc1SDmitry Monakhov *inode_reserved_space(inode) += number; 1361fd8fbfc1SDmitry Monakhov spin_unlock(&inode->i_lock); 1362fd8fbfc1SDmitry Monakhov } 1363*c469070aSDmitry Monakhov EXPORT_SYMBOL(inode_add_rsv_space); 1364fd8fbfc1SDmitry Monakhov 1365*c469070aSDmitry Monakhov void inode_claim_rsv_space(struct inode *inode, qsize_t number) 1366fd8fbfc1SDmitry Monakhov { 1367fd8fbfc1SDmitry Monakhov spin_lock(&inode->i_lock); 1368fd8fbfc1SDmitry Monakhov *inode_reserved_space(inode) -= number; 1369fd8fbfc1SDmitry Monakhov __inode_add_bytes(inode, number); 1370fd8fbfc1SDmitry Monakhov spin_unlock(&inode->i_lock); 1371fd8fbfc1SDmitry Monakhov } 1372*c469070aSDmitry Monakhov EXPORT_SYMBOL(inode_claim_rsv_space); 1373fd8fbfc1SDmitry Monakhov 1374*c469070aSDmitry Monakhov void inode_sub_rsv_space(struct inode *inode, qsize_t number) 1375fd8fbfc1SDmitry Monakhov { 1376fd8fbfc1SDmitry Monakhov spin_lock(&inode->i_lock); 1377fd8fbfc1SDmitry Monakhov *inode_reserved_space(inode) -= number; 1378fd8fbfc1SDmitry Monakhov spin_unlock(&inode->i_lock); 1379fd8fbfc1SDmitry Monakhov } 1380*c469070aSDmitry Monakhov EXPORT_SYMBOL(inode_sub_rsv_space); 1381fd8fbfc1SDmitry Monakhov 1382fd8fbfc1SDmitry Monakhov static qsize_t inode_get_rsv_space(struct inode *inode) 1383fd8fbfc1SDmitry Monakhov { 1384fd8fbfc1SDmitry Monakhov qsize_t ret; 138505b5d898SJan Kara 138605b5d898SJan Kara if (!inode->i_sb->dq_op->get_reserved_space) 138705b5d898SJan Kara return 0; 1388fd8fbfc1SDmitry Monakhov spin_lock(&inode->i_lock); 1389fd8fbfc1SDmitry Monakhov ret = *inode_reserved_space(inode); 1390fd8fbfc1SDmitry Monakhov spin_unlock(&inode->i_lock); 1391fd8fbfc1SDmitry Monakhov return ret; 1392fd8fbfc1SDmitry Monakhov } 1393fd8fbfc1SDmitry Monakhov 1394fd8fbfc1SDmitry Monakhov static void inode_incr_space(struct inode *inode, qsize_t number, 1395fd8fbfc1SDmitry Monakhov int reserve) 1396fd8fbfc1SDmitry Monakhov { 1397fd8fbfc1SDmitry Monakhov if (reserve) 1398fd8fbfc1SDmitry Monakhov inode_add_rsv_space(inode, number); 1399fd8fbfc1SDmitry Monakhov else 1400fd8fbfc1SDmitry Monakhov inode_add_bytes(inode, number); 1401fd8fbfc1SDmitry Monakhov } 1402fd8fbfc1SDmitry Monakhov 1403fd8fbfc1SDmitry Monakhov static void inode_decr_space(struct inode *inode, qsize_t number, int reserve) 1404fd8fbfc1SDmitry Monakhov { 1405fd8fbfc1SDmitry Monakhov if (reserve) 1406fd8fbfc1SDmitry Monakhov inode_sub_rsv_space(inode, number); 1407fd8fbfc1SDmitry Monakhov else 1408fd8fbfc1SDmitry Monakhov inode_sub_bytes(inode, number); 1409fd8fbfc1SDmitry Monakhov } 1410fd8fbfc1SDmitry Monakhov 1411fd8fbfc1SDmitry Monakhov /* 1412884d179dSJan Kara * Following four functions update i_blocks+i_bytes fields and 1413884d179dSJan Kara * quota information (together with appropriate checks) 1414884d179dSJan Kara * NOTE: We absolutely rely on the fact that caller dirties 1415884d179dSJan Kara * the inode (usually macros in quotaops.h care about this) and 1416884d179dSJan Kara * holds a handle for the current transaction so that dquot write and 1417884d179dSJan Kara * inode write go into the same transaction. 1418884d179dSJan Kara */ 1419884d179dSJan Kara 1420884d179dSJan Kara /* 1421884d179dSJan Kara * This operation can block, but only after everything is updated 1422884d179dSJan Kara */ 1423884d179dSJan Kara int __dquot_alloc_space(struct inode *inode, qsize_t number, 1424884d179dSJan Kara int warn, int reserve) 1425884d179dSJan Kara { 1426884d179dSJan Kara int cnt, ret = QUOTA_OK; 1427884d179dSJan Kara char warntype[MAXQUOTAS]; 1428884d179dSJan Kara 1429fd8fbfc1SDmitry Monakhov /* 1430fd8fbfc1SDmitry Monakhov * First test before acquiring mutex - solves deadlocks when we 1431fd8fbfc1SDmitry Monakhov * re-enter the quota code and are already holding the mutex 1432fd8fbfc1SDmitry Monakhov */ 1433fd8fbfc1SDmitry Monakhov if (IS_NOQUOTA(inode)) { 1434fd8fbfc1SDmitry Monakhov inode_incr_space(inode, number, reserve); 1435fd8fbfc1SDmitry Monakhov goto out; 1436fd8fbfc1SDmitry Monakhov } 1437fd8fbfc1SDmitry Monakhov 1438fd8fbfc1SDmitry Monakhov down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1439884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 1440884d179dSJan Kara warntype[cnt] = QUOTA_NL_NOWARN; 1441884d179dSJan Kara 1442884d179dSJan Kara spin_lock(&dq_data_lock); 1443884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1444dd6f3c6dSJan Kara if (!inode->i_dquot[cnt]) 1445884d179dSJan Kara continue; 1446884d179dSJan Kara if (check_bdq(inode->i_dquot[cnt], number, warn, warntype+cnt) 1447884d179dSJan Kara == NO_QUOTA) { 1448884d179dSJan Kara ret = NO_QUOTA; 1449fd8fbfc1SDmitry Monakhov spin_unlock(&dq_data_lock); 1450fd8fbfc1SDmitry Monakhov goto out_flush_warn; 1451884d179dSJan Kara } 1452884d179dSJan Kara } 1453884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1454dd6f3c6dSJan Kara if (!inode->i_dquot[cnt]) 1455884d179dSJan Kara continue; 1456884d179dSJan Kara if (reserve) 1457884d179dSJan Kara dquot_resv_space(inode->i_dquot[cnt], number); 1458884d179dSJan Kara else 1459884d179dSJan Kara dquot_incr_space(inode->i_dquot[cnt], number); 1460884d179dSJan Kara } 1461fd8fbfc1SDmitry Monakhov inode_incr_space(inode, number, reserve); 1462884d179dSJan Kara spin_unlock(&dq_data_lock); 1463fd8fbfc1SDmitry Monakhov 1464fd8fbfc1SDmitry Monakhov if (reserve) 1465fd8fbfc1SDmitry Monakhov goto out_flush_warn; 1466dc52dd3aSDmitry Monakhov mark_all_dquot_dirty(inode->i_dquot); 1467fd8fbfc1SDmitry Monakhov out_flush_warn: 1468884d179dSJan Kara flush_warnings(inode->i_dquot, warntype); 1469fd8fbfc1SDmitry Monakhov up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1470fd8fbfc1SDmitry Monakhov out: 1471884d179dSJan Kara return ret; 1472884d179dSJan Kara } 1473884d179dSJan Kara 1474884d179dSJan Kara int dquot_alloc_space(struct inode *inode, qsize_t number, int warn) 1475884d179dSJan Kara { 1476fd8fbfc1SDmitry Monakhov return __dquot_alloc_space(inode, number, warn, 0); 1477884d179dSJan Kara } 1478884d179dSJan Kara EXPORT_SYMBOL(dquot_alloc_space); 1479884d179dSJan Kara 1480884d179dSJan Kara int dquot_reserve_space(struct inode *inode, qsize_t number, int warn) 1481884d179dSJan Kara { 1482fd8fbfc1SDmitry Monakhov return __dquot_alloc_space(inode, number, warn, 1); 1483884d179dSJan Kara } 1484884d179dSJan Kara EXPORT_SYMBOL(dquot_reserve_space); 1485884d179dSJan Kara 1486884d179dSJan Kara /* 1487884d179dSJan Kara * This operation can block, but only after everything is updated 1488884d179dSJan Kara */ 1489884d179dSJan Kara int dquot_alloc_inode(const struct inode *inode, qsize_t number) 1490884d179dSJan Kara { 1491884d179dSJan Kara int cnt, ret = NO_QUOTA; 1492884d179dSJan Kara char warntype[MAXQUOTAS]; 1493884d179dSJan Kara 1494884d179dSJan Kara /* First test before acquiring mutex - solves deadlocks when we 1495884d179dSJan Kara * re-enter the quota code and are already holding the mutex */ 1496884d179dSJan Kara if (IS_NOQUOTA(inode)) 1497884d179dSJan Kara return QUOTA_OK; 1498884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 1499884d179dSJan Kara warntype[cnt] = QUOTA_NL_NOWARN; 1500884d179dSJan Kara down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1501884d179dSJan Kara spin_lock(&dq_data_lock); 1502884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1503dd6f3c6dSJan Kara if (!inode->i_dquot[cnt]) 1504884d179dSJan Kara continue; 1505268157baSJan Kara if (check_idq(inode->i_dquot[cnt], number, warntype+cnt) 1506268157baSJan Kara == NO_QUOTA) 1507884d179dSJan Kara goto warn_put_all; 1508884d179dSJan Kara } 1509884d179dSJan Kara 1510884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1511dd6f3c6dSJan Kara if (!inode->i_dquot[cnt]) 1512884d179dSJan Kara continue; 1513884d179dSJan Kara dquot_incr_inodes(inode->i_dquot[cnt], number); 1514884d179dSJan Kara } 1515884d179dSJan Kara ret = QUOTA_OK; 1516884d179dSJan Kara warn_put_all: 1517884d179dSJan Kara spin_unlock(&dq_data_lock); 1518884d179dSJan Kara if (ret == QUOTA_OK) 1519dc52dd3aSDmitry Monakhov mark_all_dquot_dirty(inode->i_dquot); 1520884d179dSJan Kara flush_warnings(inode->i_dquot, warntype); 1521884d179dSJan Kara up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1522884d179dSJan Kara return ret; 1523884d179dSJan Kara } 1524884d179dSJan Kara EXPORT_SYMBOL(dquot_alloc_inode); 1525884d179dSJan Kara 1526884d179dSJan Kara int dquot_claim_space(struct inode *inode, qsize_t number) 1527884d179dSJan Kara { 1528884d179dSJan Kara int cnt; 1529884d179dSJan Kara int ret = QUOTA_OK; 1530884d179dSJan Kara 1531884d179dSJan Kara if (IS_NOQUOTA(inode)) { 1532fd8fbfc1SDmitry Monakhov inode_claim_rsv_space(inode, number); 1533884d179dSJan Kara goto out; 1534884d179dSJan Kara } 1535884d179dSJan Kara 1536884d179dSJan Kara down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1537884d179dSJan Kara spin_lock(&dq_data_lock); 1538884d179dSJan Kara /* Claim reserved quotas to allocated quotas */ 1539884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1540dd6f3c6dSJan Kara if (inode->i_dquot[cnt]) 1541884d179dSJan Kara dquot_claim_reserved_space(inode->i_dquot[cnt], 1542884d179dSJan Kara number); 1543884d179dSJan Kara } 1544884d179dSJan Kara /* Update inode bytes */ 1545fd8fbfc1SDmitry Monakhov inode_claim_rsv_space(inode, number); 1546884d179dSJan Kara spin_unlock(&dq_data_lock); 1547dc52dd3aSDmitry Monakhov mark_all_dquot_dirty(inode->i_dquot); 1548884d179dSJan Kara up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1549884d179dSJan Kara out: 1550884d179dSJan Kara return ret; 1551884d179dSJan Kara } 1552884d179dSJan Kara EXPORT_SYMBOL(dquot_claim_space); 1553884d179dSJan Kara 1554884d179dSJan Kara /* 1555884d179dSJan Kara * This operation can block, but only after everything is updated 1556884d179dSJan Kara */ 1557fd8fbfc1SDmitry Monakhov int __dquot_free_space(struct inode *inode, qsize_t number, int reserve) 1558884d179dSJan Kara { 1559884d179dSJan Kara unsigned int cnt; 1560884d179dSJan Kara char warntype[MAXQUOTAS]; 1561884d179dSJan Kara 1562884d179dSJan Kara /* First test before acquiring mutex - solves deadlocks when we 1563884d179dSJan Kara * re-enter the quota code and are already holding the mutex */ 1564884d179dSJan Kara if (IS_NOQUOTA(inode)) { 1565fd8fbfc1SDmitry Monakhov inode_decr_space(inode, number, reserve); 1566884d179dSJan Kara return QUOTA_OK; 1567884d179dSJan Kara } 1568884d179dSJan Kara 1569884d179dSJan Kara down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1570884d179dSJan Kara spin_lock(&dq_data_lock); 1571884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1572dd6f3c6dSJan Kara if (!inode->i_dquot[cnt]) 1573884d179dSJan Kara continue; 1574884d179dSJan Kara warntype[cnt] = info_bdq_free(inode->i_dquot[cnt], number); 1575fd8fbfc1SDmitry Monakhov if (reserve) 1576fd8fbfc1SDmitry Monakhov dquot_free_reserved_space(inode->i_dquot[cnt], number); 1577fd8fbfc1SDmitry Monakhov else 1578884d179dSJan Kara dquot_decr_space(inode->i_dquot[cnt], number); 1579884d179dSJan Kara } 1580fd8fbfc1SDmitry Monakhov inode_decr_space(inode, number, reserve); 1581884d179dSJan Kara spin_unlock(&dq_data_lock); 1582fd8fbfc1SDmitry Monakhov 1583fd8fbfc1SDmitry Monakhov if (reserve) 1584fd8fbfc1SDmitry Monakhov goto out_unlock; 1585dc52dd3aSDmitry Monakhov mark_all_dquot_dirty(inode->i_dquot); 1586fd8fbfc1SDmitry Monakhov out_unlock: 1587884d179dSJan Kara flush_warnings(inode->i_dquot, warntype); 1588884d179dSJan Kara up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1589884d179dSJan Kara return QUOTA_OK; 1590884d179dSJan Kara } 1591fd8fbfc1SDmitry Monakhov 1592fd8fbfc1SDmitry Monakhov int dquot_free_space(struct inode *inode, qsize_t number) 1593fd8fbfc1SDmitry Monakhov { 1594fd8fbfc1SDmitry Monakhov return __dquot_free_space(inode, number, 0); 1595fd8fbfc1SDmitry Monakhov } 1596884d179dSJan Kara EXPORT_SYMBOL(dquot_free_space); 1597884d179dSJan Kara 1598884d179dSJan Kara /* 1599fd8fbfc1SDmitry Monakhov * Release reserved quota space 1600fd8fbfc1SDmitry Monakhov */ 1601fd8fbfc1SDmitry Monakhov void dquot_release_reserved_space(struct inode *inode, qsize_t number) 1602fd8fbfc1SDmitry Monakhov { 1603fd8fbfc1SDmitry Monakhov __dquot_free_space(inode, number, 1); 1604fd8fbfc1SDmitry Monakhov 1605fd8fbfc1SDmitry Monakhov } 1606fd8fbfc1SDmitry Monakhov EXPORT_SYMBOL(dquot_release_reserved_space); 1607fd8fbfc1SDmitry Monakhov 1608fd8fbfc1SDmitry Monakhov /* 1609884d179dSJan Kara * This operation can block, but only after everything is updated 1610884d179dSJan Kara */ 1611884d179dSJan Kara int dquot_free_inode(const struct inode *inode, qsize_t number) 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)) 1619884d179dSJan Kara return QUOTA_OK; 1620884d179dSJan Kara 1621884d179dSJan Kara down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1622884d179dSJan Kara spin_lock(&dq_data_lock); 1623884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1624dd6f3c6dSJan Kara if (!inode->i_dquot[cnt]) 1625884d179dSJan Kara continue; 1626884d179dSJan Kara warntype[cnt] = info_idq_free(inode->i_dquot[cnt], number); 1627884d179dSJan Kara dquot_decr_inodes(inode->i_dquot[cnt], number); 1628884d179dSJan Kara } 1629884d179dSJan Kara spin_unlock(&dq_data_lock); 1630dc52dd3aSDmitry Monakhov mark_all_dquot_dirty(inode->i_dquot); 1631884d179dSJan Kara flush_warnings(inode->i_dquot, warntype); 1632884d179dSJan Kara up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1633884d179dSJan Kara return QUOTA_OK; 1634884d179dSJan Kara } 1635884d179dSJan Kara EXPORT_SYMBOL(dquot_free_inode); 1636884d179dSJan Kara 1637884d179dSJan Kara /* 1638884d179dSJan Kara * Transfer the number of inode and blocks from one diskquota to an other. 1639884d179dSJan Kara * 1640884d179dSJan Kara * This operation can block, but only after everything is updated 1641884d179dSJan Kara * A transaction must be started when entering this function. 1642884d179dSJan Kara */ 1643884d179dSJan Kara int dquot_transfer(struct inode *inode, struct iattr *iattr) 1644884d179dSJan Kara { 1645884d179dSJan Kara qsize_t space, cur_space; 1646884d179dSJan Kara qsize_t rsv_space = 0; 1647884d179dSJan Kara struct dquot *transfer_from[MAXQUOTAS]; 1648884d179dSJan Kara struct dquot *transfer_to[MAXQUOTAS]; 1649884d179dSJan Kara int cnt, ret = QUOTA_OK; 1650884d179dSJan Kara int chuid = iattr->ia_valid & ATTR_UID && inode->i_uid != iattr->ia_uid, 1651884d179dSJan Kara chgid = iattr->ia_valid & ATTR_GID && inode->i_gid != iattr->ia_gid; 1652884d179dSJan Kara char warntype_to[MAXQUOTAS]; 1653884d179dSJan Kara char warntype_from_inodes[MAXQUOTAS], warntype_from_space[MAXQUOTAS]; 1654884d179dSJan Kara 1655884d179dSJan Kara /* First test before acquiring mutex - solves deadlocks when we 1656884d179dSJan Kara * re-enter the quota code and are already holding the mutex */ 1657884d179dSJan Kara if (IS_NOQUOTA(inode)) 1658884d179dSJan Kara return QUOTA_OK; 1659884d179dSJan Kara /* Initialize the arrays */ 1660884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1661dd6f3c6dSJan Kara transfer_from[cnt] = NULL; 1662dd6f3c6dSJan Kara transfer_to[cnt] = NULL; 1663884d179dSJan Kara warntype_to[cnt] = QUOTA_NL_NOWARN; 1664884d179dSJan Kara } 1665268157baSJan Kara if (chuid) 1666268157baSJan Kara transfer_to[USRQUOTA] = dqget(inode->i_sb, iattr->ia_uid, 1667268157baSJan Kara USRQUOTA); 1668268157baSJan Kara if (chgid) 1669268157baSJan Kara transfer_to[GRPQUOTA] = dqget(inode->i_sb, iattr->ia_gid, 1670268157baSJan Kara GRPQUOTA); 1671884d179dSJan Kara 1672884d179dSJan Kara down_write(&sb_dqopt(inode->i_sb)->dqptr_sem); 1673884d179dSJan Kara if (IS_NOQUOTA(inode)) { /* File without quota accounting? */ 1674884d179dSJan Kara up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); 1675884d179dSJan Kara goto put_all; 1676884d179dSJan Kara } 1677884d179dSJan Kara spin_lock(&dq_data_lock); 1678884d179dSJan Kara cur_space = inode_get_bytes(inode); 1679fd8fbfc1SDmitry Monakhov rsv_space = inode_get_rsv_space(inode); 1680884d179dSJan Kara space = cur_space + rsv_space; 1681884d179dSJan Kara /* Build the transfer_from list and check the limits */ 1682884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1683dd6f3c6dSJan Kara if (!transfer_to[cnt]) 1684884d179dSJan Kara continue; 1685884d179dSJan Kara transfer_from[cnt] = inode->i_dquot[cnt]; 1686884d179dSJan Kara if (check_idq(transfer_to[cnt], 1, warntype_to + cnt) == 1687884d179dSJan Kara NO_QUOTA || check_bdq(transfer_to[cnt], space, 0, 1688884d179dSJan Kara warntype_to + cnt) == NO_QUOTA) 1689884d179dSJan Kara goto over_quota; 1690884d179dSJan Kara } 1691884d179dSJan Kara 1692884d179dSJan Kara /* 1693884d179dSJan Kara * Finally perform the needed transfer from transfer_from to transfer_to 1694884d179dSJan Kara */ 1695884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1696884d179dSJan Kara /* 1697884d179dSJan Kara * Skip changes for same uid or gid or for turned off quota-type. 1698884d179dSJan Kara */ 1699dd6f3c6dSJan Kara if (!transfer_to[cnt]) 1700884d179dSJan Kara continue; 1701884d179dSJan Kara 1702884d179dSJan Kara /* Due to IO error we might not have transfer_from[] structure */ 1703884d179dSJan Kara if (transfer_from[cnt]) { 1704884d179dSJan Kara warntype_from_inodes[cnt] = 1705884d179dSJan Kara info_idq_free(transfer_from[cnt], 1); 1706884d179dSJan Kara warntype_from_space[cnt] = 1707884d179dSJan Kara info_bdq_free(transfer_from[cnt], space); 1708884d179dSJan Kara dquot_decr_inodes(transfer_from[cnt], 1); 1709884d179dSJan Kara dquot_decr_space(transfer_from[cnt], cur_space); 1710884d179dSJan Kara dquot_free_reserved_space(transfer_from[cnt], 1711884d179dSJan Kara rsv_space); 1712884d179dSJan Kara } 1713884d179dSJan Kara 1714884d179dSJan Kara dquot_incr_inodes(transfer_to[cnt], 1); 1715884d179dSJan Kara dquot_incr_space(transfer_to[cnt], cur_space); 1716884d179dSJan Kara dquot_resv_space(transfer_to[cnt], rsv_space); 1717884d179dSJan Kara 1718884d179dSJan Kara inode->i_dquot[cnt] = transfer_to[cnt]; 1719884d179dSJan Kara } 1720884d179dSJan Kara spin_unlock(&dq_data_lock); 1721884d179dSJan Kara up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); 1722884d179dSJan Kara 1723dc52dd3aSDmitry Monakhov mark_all_dquot_dirty(transfer_from); 1724dc52dd3aSDmitry Monakhov mark_all_dquot_dirty(transfer_to); 1725884d179dSJan Kara /* The reference we got is transferred to the inode */ 1726dc52dd3aSDmitry Monakhov for (cnt = 0; cnt < MAXQUOTAS; cnt++) 1727dd6f3c6dSJan Kara transfer_to[cnt] = NULL; 1728884d179dSJan Kara warn_put_all: 1729884d179dSJan Kara flush_warnings(transfer_to, warntype_to); 1730884d179dSJan Kara flush_warnings(transfer_from, warntype_from_inodes); 1731884d179dSJan Kara flush_warnings(transfer_from, warntype_from_space); 1732884d179dSJan Kara put_all: 1733dc52dd3aSDmitry Monakhov dqput_all(transfer_from); 1734dc52dd3aSDmitry Monakhov dqput_all(transfer_to); 1735884d179dSJan Kara return ret; 1736884d179dSJan Kara over_quota: 1737884d179dSJan Kara spin_unlock(&dq_data_lock); 1738884d179dSJan Kara up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); 1739884d179dSJan Kara /* Clear dquot pointers we don't want to dqput() */ 1740884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 1741dd6f3c6dSJan Kara transfer_from[cnt] = NULL; 1742884d179dSJan Kara ret = NO_QUOTA; 1743884d179dSJan Kara goto warn_put_all; 1744884d179dSJan Kara } 1745884d179dSJan Kara EXPORT_SYMBOL(dquot_transfer); 1746884d179dSJan Kara 1747884d179dSJan Kara /* Wrapper for transferring ownership of an inode */ 1748884d179dSJan Kara int vfs_dq_transfer(struct inode *inode, struct iattr *iattr) 1749884d179dSJan Kara { 1750884d179dSJan Kara if (sb_any_quota_active(inode->i_sb) && !IS_NOQUOTA(inode)) { 1751884d179dSJan Kara vfs_dq_init(inode); 1752884d179dSJan Kara if (inode->i_sb->dq_op->transfer(inode, iattr) == NO_QUOTA) 1753884d179dSJan Kara return 1; 1754884d179dSJan Kara } 1755884d179dSJan Kara return 0; 1756884d179dSJan Kara } 1757884d179dSJan Kara EXPORT_SYMBOL(vfs_dq_transfer); 1758884d179dSJan Kara 1759884d179dSJan Kara /* 1760884d179dSJan Kara * Write info of quota file to disk 1761884d179dSJan Kara */ 1762884d179dSJan Kara int dquot_commit_info(struct super_block *sb, int type) 1763884d179dSJan Kara { 1764884d179dSJan Kara int ret; 1765884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 1766884d179dSJan Kara 1767884d179dSJan Kara mutex_lock(&dqopt->dqio_mutex); 1768884d179dSJan Kara ret = dqopt->ops[type]->write_file_info(sb, type); 1769884d179dSJan Kara mutex_unlock(&dqopt->dqio_mutex); 1770884d179dSJan Kara return ret; 1771884d179dSJan Kara } 1772884d179dSJan Kara EXPORT_SYMBOL(dquot_commit_info); 1773884d179dSJan Kara 1774884d179dSJan Kara /* 1775884d179dSJan Kara * Definitions of diskquota operations. 1776884d179dSJan Kara */ 177761e225dcSAlexey Dobriyan const struct dquot_operations dquot_operations = { 1778884d179dSJan Kara .initialize = dquot_initialize, 1779884d179dSJan Kara .drop = dquot_drop, 1780884d179dSJan Kara .alloc_space = dquot_alloc_space, 1781884d179dSJan Kara .alloc_inode = dquot_alloc_inode, 1782884d179dSJan Kara .free_space = dquot_free_space, 1783884d179dSJan Kara .free_inode = dquot_free_inode, 1784884d179dSJan Kara .transfer = dquot_transfer, 1785884d179dSJan Kara .write_dquot = dquot_commit, 1786884d179dSJan Kara .acquire_dquot = dquot_acquire, 1787884d179dSJan Kara .release_dquot = dquot_release, 1788884d179dSJan Kara .mark_dirty = dquot_mark_dquot_dirty, 1789884d179dSJan Kara .write_info = dquot_commit_info, 1790884d179dSJan Kara .alloc_dquot = dquot_alloc, 1791884d179dSJan Kara .destroy_dquot = dquot_destroy, 1792884d179dSJan Kara }; 1793884d179dSJan Kara 1794884d179dSJan Kara /* 1795884d179dSJan Kara * Turn quota off on a device. type == -1 ==> quotaoff for all types (umount) 1796884d179dSJan Kara */ 1797884d179dSJan Kara int vfs_quota_disable(struct super_block *sb, int type, unsigned int flags) 1798884d179dSJan Kara { 1799884d179dSJan Kara int cnt, ret = 0; 1800884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 1801884d179dSJan Kara struct inode *toputinode[MAXQUOTAS]; 1802884d179dSJan Kara 1803884d179dSJan Kara /* Cannot turn off usage accounting without turning off limits, or 1804884d179dSJan Kara * suspend quotas and simultaneously turn quotas off. */ 1805884d179dSJan Kara if ((flags & DQUOT_USAGE_ENABLED && !(flags & DQUOT_LIMITS_ENABLED)) 1806884d179dSJan Kara || (flags & DQUOT_SUSPENDED && flags & (DQUOT_LIMITS_ENABLED | 1807884d179dSJan Kara DQUOT_USAGE_ENABLED))) 1808884d179dSJan Kara return -EINVAL; 1809884d179dSJan Kara 1810884d179dSJan Kara /* We need to serialize quota_off() for device */ 1811884d179dSJan Kara mutex_lock(&dqopt->dqonoff_mutex); 1812884d179dSJan Kara 1813884d179dSJan Kara /* 1814884d179dSJan Kara * Skip everything if there's nothing to do. We have to do this because 1815884d179dSJan Kara * sometimes we are called when fill_super() failed and calling 1816884d179dSJan Kara * sync_fs() in such cases does no good. 1817884d179dSJan Kara */ 1818884d179dSJan Kara if (!sb_any_quota_loaded(sb)) { 1819884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 1820884d179dSJan Kara return 0; 1821884d179dSJan Kara } 1822884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1823884d179dSJan Kara toputinode[cnt] = NULL; 1824884d179dSJan Kara if (type != -1 && cnt != type) 1825884d179dSJan Kara continue; 1826884d179dSJan Kara if (!sb_has_quota_loaded(sb, cnt)) 1827884d179dSJan Kara continue; 1828884d179dSJan Kara 1829884d179dSJan Kara if (flags & DQUOT_SUSPENDED) { 1830884d179dSJan Kara spin_lock(&dq_state_lock); 1831884d179dSJan Kara dqopt->flags |= 1832884d179dSJan Kara dquot_state_flag(DQUOT_SUSPENDED, cnt); 1833884d179dSJan Kara spin_unlock(&dq_state_lock); 1834884d179dSJan Kara } else { 1835884d179dSJan Kara spin_lock(&dq_state_lock); 1836884d179dSJan Kara dqopt->flags &= ~dquot_state_flag(flags, cnt); 1837884d179dSJan Kara /* Turning off suspended quotas? */ 1838884d179dSJan Kara if (!sb_has_quota_loaded(sb, cnt) && 1839884d179dSJan Kara sb_has_quota_suspended(sb, cnt)) { 1840884d179dSJan Kara dqopt->flags &= ~dquot_state_flag( 1841884d179dSJan Kara DQUOT_SUSPENDED, cnt); 1842884d179dSJan Kara spin_unlock(&dq_state_lock); 1843884d179dSJan Kara iput(dqopt->files[cnt]); 1844884d179dSJan Kara dqopt->files[cnt] = NULL; 1845884d179dSJan Kara continue; 1846884d179dSJan Kara } 1847884d179dSJan Kara spin_unlock(&dq_state_lock); 1848884d179dSJan Kara } 1849884d179dSJan Kara 1850884d179dSJan Kara /* We still have to keep quota loaded? */ 1851884d179dSJan Kara if (sb_has_quota_loaded(sb, cnt) && !(flags & DQUOT_SUSPENDED)) 1852884d179dSJan Kara continue; 1853884d179dSJan Kara 1854884d179dSJan Kara /* Note: these are blocking operations */ 1855884d179dSJan Kara drop_dquot_ref(sb, cnt); 1856884d179dSJan Kara invalidate_dquots(sb, cnt); 1857884d179dSJan Kara /* 1858268157baSJan Kara * Now all dquots should be invalidated, all writes done so we 1859268157baSJan Kara * should be only users of the info. No locks needed. 1860884d179dSJan Kara */ 1861884d179dSJan Kara if (info_dirty(&dqopt->info[cnt])) 1862884d179dSJan Kara sb->dq_op->write_info(sb, cnt); 1863884d179dSJan Kara if (dqopt->ops[cnt]->free_file_info) 1864884d179dSJan Kara dqopt->ops[cnt]->free_file_info(sb, cnt); 1865884d179dSJan Kara put_quota_format(dqopt->info[cnt].dqi_format); 1866884d179dSJan Kara 1867884d179dSJan Kara toputinode[cnt] = dqopt->files[cnt]; 1868884d179dSJan Kara if (!sb_has_quota_loaded(sb, cnt)) 1869884d179dSJan Kara dqopt->files[cnt] = NULL; 1870884d179dSJan Kara dqopt->info[cnt].dqi_flags = 0; 1871884d179dSJan Kara dqopt->info[cnt].dqi_igrace = 0; 1872884d179dSJan Kara dqopt->info[cnt].dqi_bgrace = 0; 1873884d179dSJan Kara dqopt->ops[cnt] = NULL; 1874884d179dSJan Kara } 1875884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 1876884d179dSJan Kara 1877884d179dSJan Kara /* Skip syncing and setting flags if quota files are hidden */ 1878884d179dSJan Kara if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) 1879884d179dSJan Kara goto put_inodes; 1880884d179dSJan Kara 1881884d179dSJan Kara /* Sync the superblock so that buffers with quota data are written to 1882884d179dSJan Kara * disk (and so userspace sees correct data afterwards). */ 1883884d179dSJan Kara if (sb->s_op->sync_fs) 1884884d179dSJan Kara sb->s_op->sync_fs(sb, 1); 1885884d179dSJan Kara sync_blockdev(sb->s_bdev); 1886884d179dSJan Kara /* Now the quota files are just ordinary files and we can set the 1887884d179dSJan Kara * inode flags back. Moreover we discard the pagecache so that 1888884d179dSJan Kara * userspace sees the writes we did bypassing the pagecache. We 1889884d179dSJan Kara * must also discard the blockdev buffers so that we see the 1890884d179dSJan Kara * changes done by userspace on the next quotaon() */ 1891884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 1892884d179dSJan Kara if (toputinode[cnt]) { 1893884d179dSJan Kara mutex_lock(&dqopt->dqonoff_mutex); 1894884d179dSJan Kara /* If quota was reenabled in the meantime, we have 1895884d179dSJan Kara * nothing to do */ 1896884d179dSJan Kara if (!sb_has_quota_loaded(sb, cnt)) { 1897268157baSJan Kara mutex_lock_nested(&toputinode[cnt]->i_mutex, 1898268157baSJan Kara I_MUTEX_QUOTA); 1899884d179dSJan Kara toputinode[cnt]->i_flags &= ~(S_IMMUTABLE | 1900884d179dSJan Kara S_NOATIME | S_NOQUOTA); 1901268157baSJan Kara truncate_inode_pages(&toputinode[cnt]->i_data, 1902268157baSJan Kara 0); 1903884d179dSJan Kara mutex_unlock(&toputinode[cnt]->i_mutex); 1904884d179dSJan Kara mark_inode_dirty(toputinode[cnt]); 1905884d179dSJan Kara } 1906884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 1907884d179dSJan Kara } 1908884d179dSJan Kara if (sb->s_bdev) 1909884d179dSJan Kara invalidate_bdev(sb->s_bdev); 1910884d179dSJan Kara put_inodes: 1911884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 1912884d179dSJan Kara if (toputinode[cnt]) { 1913884d179dSJan Kara /* On remount RO, we keep the inode pointer so that we 1914884d179dSJan Kara * can reenable quota on the subsequent remount RW. We 1915884d179dSJan Kara * have to check 'flags' variable and not use sb_has_ 1916884d179dSJan Kara * function because another quotaon / quotaoff could 1917884d179dSJan Kara * change global state before we got here. We refuse 1918884d179dSJan Kara * to suspend quotas when there is pending delete on 1919884d179dSJan Kara * the quota file... */ 1920884d179dSJan Kara if (!(flags & DQUOT_SUSPENDED)) 1921884d179dSJan Kara iput(toputinode[cnt]); 1922884d179dSJan Kara else if (!toputinode[cnt]->i_nlink) 1923884d179dSJan Kara ret = -EBUSY; 1924884d179dSJan Kara } 1925884d179dSJan Kara return ret; 1926884d179dSJan Kara } 1927884d179dSJan Kara EXPORT_SYMBOL(vfs_quota_disable); 1928884d179dSJan Kara 1929884d179dSJan Kara int vfs_quota_off(struct super_block *sb, int type, int remount) 1930884d179dSJan Kara { 1931884d179dSJan Kara return vfs_quota_disable(sb, type, remount ? DQUOT_SUSPENDED : 1932884d179dSJan Kara (DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED)); 1933884d179dSJan Kara } 1934884d179dSJan Kara EXPORT_SYMBOL(vfs_quota_off); 1935884d179dSJan Kara /* 1936884d179dSJan Kara * Turn quotas on on a device 1937884d179dSJan Kara */ 1938884d179dSJan Kara 1939884d179dSJan Kara /* 1940884d179dSJan Kara * Helper function to turn quotas on when we already have the inode of 1941884d179dSJan Kara * quota file and no quota information is loaded. 1942884d179dSJan Kara */ 1943884d179dSJan Kara static int vfs_load_quota_inode(struct inode *inode, int type, int format_id, 1944884d179dSJan Kara unsigned int flags) 1945884d179dSJan Kara { 1946884d179dSJan Kara struct quota_format_type *fmt = find_quota_format(format_id); 1947884d179dSJan Kara struct super_block *sb = inode->i_sb; 1948884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 1949884d179dSJan Kara int error; 1950884d179dSJan Kara int oldflags = -1; 1951884d179dSJan Kara 1952884d179dSJan Kara if (!fmt) 1953884d179dSJan Kara return -ESRCH; 1954884d179dSJan Kara if (!S_ISREG(inode->i_mode)) { 1955884d179dSJan Kara error = -EACCES; 1956884d179dSJan Kara goto out_fmt; 1957884d179dSJan Kara } 1958884d179dSJan Kara if (IS_RDONLY(inode)) { 1959884d179dSJan Kara error = -EROFS; 1960884d179dSJan Kara goto out_fmt; 1961884d179dSJan Kara } 1962884d179dSJan Kara if (!sb->s_op->quota_write || !sb->s_op->quota_read) { 1963884d179dSJan Kara error = -EINVAL; 1964884d179dSJan Kara goto out_fmt; 1965884d179dSJan Kara } 1966884d179dSJan Kara /* Usage always has to be set... */ 1967884d179dSJan Kara if (!(flags & DQUOT_USAGE_ENABLED)) { 1968884d179dSJan Kara error = -EINVAL; 1969884d179dSJan Kara goto out_fmt; 1970884d179dSJan Kara } 1971884d179dSJan Kara 1972884d179dSJan Kara if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) { 1973884d179dSJan Kara /* As we bypass the pagecache we must now flush the inode so 1974884d179dSJan Kara * that we see all the changes from userspace... */ 1975884d179dSJan Kara write_inode_now(inode, 1); 1976884d179dSJan Kara /* And now flush the block cache so that kernel sees the 1977884d179dSJan Kara * changes */ 1978884d179dSJan Kara invalidate_bdev(sb->s_bdev); 1979884d179dSJan Kara } 1980884d179dSJan Kara mutex_lock(&dqopt->dqonoff_mutex); 1981884d179dSJan Kara if (sb_has_quota_loaded(sb, type)) { 1982884d179dSJan Kara error = -EBUSY; 1983884d179dSJan Kara goto out_lock; 1984884d179dSJan Kara } 1985884d179dSJan Kara 1986884d179dSJan Kara if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) { 1987884d179dSJan Kara /* We don't want quota and atime on quota files (deadlocks 1988884d179dSJan Kara * possible) Also nobody should write to the file - we use 1989884d179dSJan Kara * special IO operations which ignore the immutable bit. */ 1990dee86565SJan Kara mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA); 1991268157baSJan Kara oldflags = inode->i_flags & (S_NOATIME | S_IMMUTABLE | 1992268157baSJan Kara S_NOQUOTA); 1993884d179dSJan Kara inode->i_flags |= S_NOQUOTA | S_NOATIME | S_IMMUTABLE; 1994dee86565SJan Kara mutex_unlock(&inode->i_mutex); 199526245c94SJan Kara /* 199626245c94SJan Kara * When S_NOQUOTA is set, remove dquot references as no more 199726245c94SJan Kara * references can be added 199826245c94SJan Kara */ 1999884d179dSJan Kara sb->dq_op->drop(inode); 2000884d179dSJan Kara } 2001884d179dSJan Kara 2002884d179dSJan Kara error = -EIO; 2003884d179dSJan Kara dqopt->files[type] = igrab(inode); 2004884d179dSJan Kara if (!dqopt->files[type]) 2005884d179dSJan Kara goto out_lock; 2006884d179dSJan Kara error = -EINVAL; 2007884d179dSJan Kara if (!fmt->qf_ops->check_quota_file(sb, type)) 2008884d179dSJan Kara goto out_file_init; 2009884d179dSJan Kara 2010884d179dSJan Kara dqopt->ops[type] = fmt->qf_ops; 2011884d179dSJan Kara dqopt->info[type].dqi_format = fmt; 2012884d179dSJan Kara dqopt->info[type].dqi_fmt_id = format_id; 2013884d179dSJan Kara INIT_LIST_HEAD(&dqopt->info[type].dqi_dirty_list); 2014884d179dSJan Kara mutex_lock(&dqopt->dqio_mutex); 2015268157baSJan Kara error = dqopt->ops[type]->read_file_info(sb, type); 2016268157baSJan Kara if (error < 0) { 2017884d179dSJan Kara mutex_unlock(&dqopt->dqio_mutex); 2018884d179dSJan Kara goto out_file_init; 2019884d179dSJan Kara } 2020884d179dSJan Kara mutex_unlock(&dqopt->dqio_mutex); 2021884d179dSJan Kara spin_lock(&dq_state_lock); 2022884d179dSJan Kara dqopt->flags |= dquot_state_flag(flags, type); 2023884d179dSJan Kara spin_unlock(&dq_state_lock); 2024884d179dSJan Kara 2025884d179dSJan Kara add_dquot_ref(sb, type); 2026884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 2027884d179dSJan Kara 2028884d179dSJan Kara return 0; 2029884d179dSJan Kara 2030884d179dSJan Kara out_file_init: 2031884d179dSJan Kara dqopt->files[type] = NULL; 2032884d179dSJan Kara iput(inode); 2033884d179dSJan Kara out_lock: 2034884d179dSJan Kara if (oldflags != -1) { 2035dee86565SJan Kara mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA); 2036884d179dSJan Kara /* Set the flags back (in the case of accidental quotaon() 2037884d179dSJan Kara * on a wrong file we don't want to mess up the flags) */ 2038884d179dSJan Kara inode->i_flags &= ~(S_NOATIME | S_NOQUOTA | S_IMMUTABLE); 2039884d179dSJan Kara inode->i_flags |= oldflags; 2040dee86565SJan Kara mutex_unlock(&inode->i_mutex); 2041884d179dSJan Kara } 2042d01730d7SJiaying Zhang mutex_unlock(&dqopt->dqonoff_mutex); 2043884d179dSJan Kara out_fmt: 2044884d179dSJan Kara put_quota_format(fmt); 2045884d179dSJan Kara 2046884d179dSJan Kara return error; 2047884d179dSJan Kara } 2048884d179dSJan Kara 2049884d179dSJan Kara /* Reenable quotas on remount RW */ 2050884d179dSJan Kara static int vfs_quota_on_remount(struct super_block *sb, int type) 2051884d179dSJan Kara { 2052884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 2053884d179dSJan Kara struct inode *inode; 2054884d179dSJan Kara int ret; 2055884d179dSJan Kara unsigned int flags; 2056884d179dSJan Kara 2057884d179dSJan Kara mutex_lock(&dqopt->dqonoff_mutex); 2058884d179dSJan Kara if (!sb_has_quota_suspended(sb, type)) { 2059884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 2060884d179dSJan Kara return 0; 2061884d179dSJan Kara } 2062884d179dSJan Kara inode = dqopt->files[type]; 2063884d179dSJan Kara dqopt->files[type] = NULL; 2064884d179dSJan Kara spin_lock(&dq_state_lock); 2065884d179dSJan Kara flags = dqopt->flags & dquot_state_flag(DQUOT_USAGE_ENABLED | 2066884d179dSJan Kara DQUOT_LIMITS_ENABLED, type); 2067884d179dSJan Kara dqopt->flags &= ~dquot_state_flag(DQUOT_STATE_FLAGS, type); 2068884d179dSJan Kara spin_unlock(&dq_state_lock); 2069884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 2070884d179dSJan Kara 2071884d179dSJan Kara flags = dquot_generic_flag(flags, type); 2072884d179dSJan Kara ret = vfs_load_quota_inode(inode, type, dqopt->info[type].dqi_fmt_id, 2073884d179dSJan Kara flags); 2074884d179dSJan Kara iput(inode); 2075884d179dSJan Kara 2076884d179dSJan Kara return ret; 2077884d179dSJan Kara } 2078884d179dSJan Kara 2079884d179dSJan Kara int vfs_quota_on_path(struct super_block *sb, int type, int format_id, 2080884d179dSJan Kara struct path *path) 2081884d179dSJan Kara { 2082884d179dSJan Kara int error = security_quota_on(path->dentry); 2083884d179dSJan Kara if (error) 2084884d179dSJan Kara return error; 2085884d179dSJan Kara /* Quota file not on the same filesystem? */ 2086884d179dSJan Kara if (path->mnt->mnt_sb != sb) 2087884d179dSJan Kara error = -EXDEV; 2088884d179dSJan Kara else 2089884d179dSJan Kara error = vfs_load_quota_inode(path->dentry->d_inode, type, 2090884d179dSJan Kara format_id, DQUOT_USAGE_ENABLED | 2091884d179dSJan Kara DQUOT_LIMITS_ENABLED); 2092884d179dSJan Kara return error; 2093884d179dSJan Kara } 2094884d179dSJan Kara EXPORT_SYMBOL(vfs_quota_on_path); 2095884d179dSJan Kara 2096884d179dSJan Kara int vfs_quota_on(struct super_block *sb, int type, int format_id, char *name, 2097884d179dSJan Kara int remount) 2098884d179dSJan Kara { 2099884d179dSJan Kara struct path path; 2100884d179dSJan Kara int error; 2101884d179dSJan Kara 2102884d179dSJan Kara if (remount) 2103884d179dSJan Kara return vfs_quota_on_remount(sb, type); 2104884d179dSJan Kara 2105884d179dSJan Kara error = kern_path(name, LOOKUP_FOLLOW, &path); 2106884d179dSJan Kara if (!error) { 2107884d179dSJan Kara error = vfs_quota_on_path(sb, type, format_id, &path); 2108884d179dSJan Kara path_put(&path); 2109884d179dSJan Kara } 2110884d179dSJan Kara return error; 2111884d179dSJan Kara } 2112884d179dSJan Kara EXPORT_SYMBOL(vfs_quota_on); 2113884d179dSJan Kara 2114884d179dSJan Kara /* 2115884d179dSJan Kara * More powerful function for turning on quotas allowing setting 2116884d179dSJan Kara * of individual quota flags 2117884d179dSJan Kara */ 2118884d179dSJan Kara int vfs_quota_enable(struct inode *inode, int type, int format_id, 2119884d179dSJan Kara unsigned int flags) 2120884d179dSJan Kara { 2121884d179dSJan Kara int ret = 0; 2122884d179dSJan Kara struct super_block *sb = inode->i_sb; 2123884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 2124884d179dSJan Kara 2125884d179dSJan Kara /* Just unsuspend quotas? */ 2126884d179dSJan Kara if (flags & DQUOT_SUSPENDED) 2127884d179dSJan Kara return vfs_quota_on_remount(sb, type); 2128884d179dSJan Kara if (!flags) 2129884d179dSJan Kara return 0; 2130884d179dSJan Kara /* Just updating flags needed? */ 2131884d179dSJan Kara if (sb_has_quota_loaded(sb, type)) { 2132884d179dSJan Kara mutex_lock(&dqopt->dqonoff_mutex); 2133884d179dSJan Kara /* Now do a reliable test... */ 2134884d179dSJan Kara if (!sb_has_quota_loaded(sb, type)) { 2135884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 2136884d179dSJan Kara goto load_quota; 2137884d179dSJan Kara } 2138884d179dSJan Kara if (flags & DQUOT_USAGE_ENABLED && 2139884d179dSJan Kara sb_has_quota_usage_enabled(sb, type)) { 2140884d179dSJan Kara ret = -EBUSY; 2141884d179dSJan Kara goto out_lock; 2142884d179dSJan Kara } 2143884d179dSJan Kara if (flags & DQUOT_LIMITS_ENABLED && 2144884d179dSJan Kara sb_has_quota_limits_enabled(sb, type)) { 2145884d179dSJan Kara ret = -EBUSY; 2146884d179dSJan Kara goto out_lock; 2147884d179dSJan Kara } 2148884d179dSJan Kara spin_lock(&dq_state_lock); 2149884d179dSJan Kara sb_dqopt(sb)->flags |= dquot_state_flag(flags, type); 2150884d179dSJan Kara spin_unlock(&dq_state_lock); 2151884d179dSJan Kara out_lock: 2152884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 2153884d179dSJan Kara return ret; 2154884d179dSJan Kara } 2155884d179dSJan Kara 2156884d179dSJan Kara load_quota: 2157884d179dSJan Kara return vfs_load_quota_inode(inode, type, format_id, flags); 2158884d179dSJan Kara } 2159884d179dSJan Kara EXPORT_SYMBOL(vfs_quota_enable); 2160884d179dSJan Kara 2161884d179dSJan Kara /* 2162884d179dSJan Kara * This function is used when filesystem needs to initialize quotas 2163884d179dSJan Kara * during mount time. 2164884d179dSJan Kara */ 2165884d179dSJan Kara int vfs_quota_on_mount(struct super_block *sb, char *qf_name, 2166884d179dSJan Kara int format_id, int type) 2167884d179dSJan Kara { 2168884d179dSJan Kara struct dentry *dentry; 2169884d179dSJan Kara int error; 2170884d179dSJan Kara 2171c56818d7SJan Kara mutex_lock(&sb->s_root->d_inode->i_mutex); 2172884d179dSJan Kara dentry = lookup_one_len(qf_name, sb->s_root, strlen(qf_name)); 2173c56818d7SJan Kara mutex_unlock(&sb->s_root->d_inode->i_mutex); 2174884d179dSJan Kara if (IS_ERR(dentry)) 2175884d179dSJan Kara return PTR_ERR(dentry); 2176884d179dSJan Kara 2177884d179dSJan Kara if (!dentry->d_inode) { 2178884d179dSJan Kara error = -ENOENT; 2179884d179dSJan Kara goto out; 2180884d179dSJan Kara } 2181884d179dSJan Kara 2182884d179dSJan Kara error = security_quota_on(dentry); 2183884d179dSJan Kara if (!error) 2184884d179dSJan Kara error = vfs_load_quota_inode(dentry->d_inode, type, format_id, 2185884d179dSJan Kara DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); 2186884d179dSJan Kara 2187884d179dSJan Kara out: 2188884d179dSJan Kara dput(dentry); 2189884d179dSJan Kara return error; 2190884d179dSJan Kara } 2191884d179dSJan Kara EXPORT_SYMBOL(vfs_quota_on_mount); 2192884d179dSJan Kara 2193884d179dSJan Kara /* Wrapper to turn on quotas when remounting rw */ 2194884d179dSJan Kara int vfs_dq_quota_on_remount(struct super_block *sb) 2195884d179dSJan Kara { 2196884d179dSJan Kara int cnt; 2197884d179dSJan Kara int ret = 0, err; 2198884d179dSJan Kara 2199884d179dSJan Kara if (!sb->s_qcop || !sb->s_qcop->quota_on) 2200884d179dSJan Kara return -ENOSYS; 2201884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 2202884d179dSJan Kara err = sb->s_qcop->quota_on(sb, cnt, 0, NULL, 1); 2203884d179dSJan Kara if (err < 0 && !ret) 2204884d179dSJan Kara ret = err; 2205884d179dSJan Kara } 2206884d179dSJan Kara return ret; 2207884d179dSJan Kara } 2208884d179dSJan Kara EXPORT_SYMBOL(vfs_dq_quota_on_remount); 2209884d179dSJan Kara 2210884d179dSJan Kara static inline qsize_t qbtos(qsize_t blocks) 2211884d179dSJan Kara { 2212884d179dSJan Kara return blocks << QIF_DQBLKSIZE_BITS; 2213884d179dSJan Kara } 2214884d179dSJan Kara 2215884d179dSJan Kara static inline qsize_t stoqb(qsize_t space) 2216884d179dSJan Kara { 2217884d179dSJan Kara return (space + QIF_DQBLKSIZE - 1) >> QIF_DQBLKSIZE_BITS; 2218884d179dSJan Kara } 2219884d179dSJan Kara 2220884d179dSJan Kara /* Generic routine for getting common part of quota structure */ 2221884d179dSJan Kara static void do_get_dqblk(struct dquot *dquot, struct if_dqblk *di) 2222884d179dSJan Kara { 2223884d179dSJan Kara struct mem_dqblk *dm = &dquot->dq_dqb; 2224884d179dSJan Kara 2225884d179dSJan Kara spin_lock(&dq_data_lock); 2226884d179dSJan Kara di->dqb_bhardlimit = stoqb(dm->dqb_bhardlimit); 2227884d179dSJan Kara di->dqb_bsoftlimit = stoqb(dm->dqb_bsoftlimit); 2228884d179dSJan Kara di->dqb_curspace = dm->dqb_curspace + dm->dqb_rsvspace; 2229884d179dSJan Kara di->dqb_ihardlimit = dm->dqb_ihardlimit; 2230884d179dSJan Kara di->dqb_isoftlimit = dm->dqb_isoftlimit; 2231884d179dSJan Kara di->dqb_curinodes = dm->dqb_curinodes; 2232884d179dSJan Kara di->dqb_btime = dm->dqb_btime; 2233884d179dSJan Kara di->dqb_itime = dm->dqb_itime; 2234884d179dSJan Kara di->dqb_valid = QIF_ALL; 2235884d179dSJan Kara spin_unlock(&dq_data_lock); 2236884d179dSJan Kara } 2237884d179dSJan Kara 2238268157baSJan Kara int vfs_get_dqblk(struct super_block *sb, int type, qid_t id, 2239268157baSJan Kara struct if_dqblk *di) 2240884d179dSJan Kara { 2241884d179dSJan Kara struct dquot *dquot; 2242884d179dSJan Kara 2243884d179dSJan Kara dquot = dqget(sb, id, type); 2244dd6f3c6dSJan Kara if (!dquot) 2245884d179dSJan Kara return -ESRCH; 2246884d179dSJan Kara do_get_dqblk(dquot, di); 2247884d179dSJan Kara dqput(dquot); 2248884d179dSJan Kara 2249884d179dSJan Kara return 0; 2250884d179dSJan Kara } 2251884d179dSJan Kara EXPORT_SYMBOL(vfs_get_dqblk); 2252884d179dSJan Kara 2253884d179dSJan Kara /* Generic routine for setting common part of quota structure */ 2254884d179dSJan Kara static int do_set_dqblk(struct dquot *dquot, struct if_dqblk *di) 2255884d179dSJan Kara { 2256884d179dSJan Kara struct mem_dqblk *dm = &dquot->dq_dqb; 2257884d179dSJan Kara int check_blim = 0, check_ilim = 0; 2258884d179dSJan Kara struct mem_dqinfo *dqi = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_type]; 2259884d179dSJan Kara 2260884d179dSJan Kara if ((di->dqb_valid & QIF_BLIMITS && 2261884d179dSJan Kara (di->dqb_bhardlimit > dqi->dqi_maxblimit || 2262884d179dSJan Kara di->dqb_bsoftlimit > dqi->dqi_maxblimit)) || 2263884d179dSJan Kara (di->dqb_valid & QIF_ILIMITS && 2264884d179dSJan Kara (di->dqb_ihardlimit > dqi->dqi_maxilimit || 2265884d179dSJan Kara di->dqb_isoftlimit > dqi->dqi_maxilimit))) 2266884d179dSJan Kara return -ERANGE; 2267884d179dSJan Kara 2268884d179dSJan Kara spin_lock(&dq_data_lock); 2269884d179dSJan Kara if (di->dqb_valid & QIF_SPACE) { 2270884d179dSJan Kara dm->dqb_curspace = di->dqb_curspace - dm->dqb_rsvspace; 2271884d179dSJan Kara check_blim = 1; 2272884d179dSJan Kara __set_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags); 2273884d179dSJan Kara } 2274884d179dSJan Kara if (di->dqb_valid & QIF_BLIMITS) { 2275884d179dSJan Kara dm->dqb_bsoftlimit = qbtos(di->dqb_bsoftlimit); 2276884d179dSJan Kara dm->dqb_bhardlimit = qbtos(di->dqb_bhardlimit); 2277884d179dSJan Kara check_blim = 1; 2278884d179dSJan Kara __set_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags); 2279884d179dSJan Kara } 2280884d179dSJan Kara if (di->dqb_valid & QIF_INODES) { 2281884d179dSJan Kara dm->dqb_curinodes = di->dqb_curinodes; 2282884d179dSJan Kara check_ilim = 1; 2283884d179dSJan Kara __set_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags); 2284884d179dSJan Kara } 2285884d179dSJan Kara if (di->dqb_valid & QIF_ILIMITS) { 2286884d179dSJan Kara dm->dqb_isoftlimit = di->dqb_isoftlimit; 2287884d179dSJan Kara dm->dqb_ihardlimit = di->dqb_ihardlimit; 2288884d179dSJan Kara check_ilim = 1; 2289884d179dSJan Kara __set_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags); 2290884d179dSJan Kara } 2291884d179dSJan Kara if (di->dqb_valid & QIF_BTIME) { 2292884d179dSJan Kara dm->dqb_btime = di->dqb_btime; 2293884d179dSJan Kara check_blim = 1; 2294884d179dSJan Kara __set_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags); 2295884d179dSJan Kara } 2296884d179dSJan Kara if (di->dqb_valid & QIF_ITIME) { 2297884d179dSJan Kara dm->dqb_itime = di->dqb_itime; 2298884d179dSJan Kara check_ilim = 1; 2299884d179dSJan Kara __set_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags); 2300884d179dSJan Kara } 2301884d179dSJan Kara 2302884d179dSJan Kara if (check_blim) { 2303268157baSJan Kara if (!dm->dqb_bsoftlimit || 2304268157baSJan Kara dm->dqb_curspace < dm->dqb_bsoftlimit) { 2305884d179dSJan Kara dm->dqb_btime = 0; 2306884d179dSJan Kara clear_bit(DQ_BLKS_B, &dquot->dq_flags); 2307268157baSJan Kara } else if (!(di->dqb_valid & QIF_BTIME)) 2308268157baSJan Kara /* Set grace only if user hasn't provided his own... */ 2309884d179dSJan Kara dm->dqb_btime = get_seconds() + dqi->dqi_bgrace; 2310884d179dSJan Kara } 2311884d179dSJan Kara if (check_ilim) { 2312268157baSJan Kara if (!dm->dqb_isoftlimit || 2313268157baSJan Kara dm->dqb_curinodes < dm->dqb_isoftlimit) { 2314884d179dSJan Kara dm->dqb_itime = 0; 2315884d179dSJan Kara clear_bit(DQ_INODES_B, &dquot->dq_flags); 2316268157baSJan Kara } else if (!(di->dqb_valid & QIF_ITIME)) 2317268157baSJan Kara /* Set grace only if user hasn't provided his own... */ 2318884d179dSJan Kara dm->dqb_itime = get_seconds() + dqi->dqi_igrace; 2319884d179dSJan Kara } 2320268157baSJan Kara if (dm->dqb_bhardlimit || dm->dqb_bsoftlimit || dm->dqb_ihardlimit || 2321268157baSJan Kara dm->dqb_isoftlimit) 2322884d179dSJan Kara clear_bit(DQ_FAKE_B, &dquot->dq_flags); 2323884d179dSJan Kara else 2324884d179dSJan Kara set_bit(DQ_FAKE_B, &dquot->dq_flags); 2325884d179dSJan Kara spin_unlock(&dq_data_lock); 2326884d179dSJan Kara mark_dquot_dirty(dquot); 2327884d179dSJan Kara 2328884d179dSJan Kara return 0; 2329884d179dSJan Kara } 2330884d179dSJan Kara 2331268157baSJan Kara int vfs_set_dqblk(struct super_block *sb, int type, qid_t id, 2332268157baSJan Kara struct if_dqblk *di) 2333884d179dSJan Kara { 2334884d179dSJan Kara struct dquot *dquot; 2335884d179dSJan Kara int rc; 2336884d179dSJan Kara 2337884d179dSJan Kara dquot = dqget(sb, id, type); 2338884d179dSJan Kara if (!dquot) { 2339884d179dSJan Kara rc = -ESRCH; 2340884d179dSJan Kara goto out; 2341884d179dSJan Kara } 2342884d179dSJan Kara rc = do_set_dqblk(dquot, di); 2343884d179dSJan Kara dqput(dquot); 2344884d179dSJan Kara out: 2345884d179dSJan Kara return rc; 2346884d179dSJan Kara } 2347884d179dSJan Kara EXPORT_SYMBOL(vfs_set_dqblk); 2348884d179dSJan Kara 2349884d179dSJan Kara /* Generic routine for getting common part of quota file information */ 2350884d179dSJan Kara int vfs_get_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii) 2351884d179dSJan Kara { 2352884d179dSJan Kara struct mem_dqinfo *mi; 2353884d179dSJan Kara 2354884d179dSJan Kara mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); 2355884d179dSJan Kara if (!sb_has_quota_active(sb, type)) { 2356884d179dSJan Kara mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); 2357884d179dSJan Kara return -ESRCH; 2358884d179dSJan Kara } 2359884d179dSJan Kara mi = sb_dqopt(sb)->info + type; 2360884d179dSJan Kara spin_lock(&dq_data_lock); 2361884d179dSJan Kara ii->dqi_bgrace = mi->dqi_bgrace; 2362884d179dSJan Kara ii->dqi_igrace = mi->dqi_igrace; 2363884d179dSJan Kara ii->dqi_flags = mi->dqi_flags & DQF_MASK; 2364884d179dSJan Kara ii->dqi_valid = IIF_ALL; 2365884d179dSJan Kara spin_unlock(&dq_data_lock); 2366884d179dSJan Kara mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); 2367884d179dSJan Kara return 0; 2368884d179dSJan Kara } 2369884d179dSJan Kara EXPORT_SYMBOL(vfs_get_dqinfo); 2370884d179dSJan Kara 2371884d179dSJan Kara /* Generic routine for setting common part of quota file information */ 2372884d179dSJan Kara int vfs_set_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii) 2373884d179dSJan Kara { 2374884d179dSJan Kara struct mem_dqinfo *mi; 2375884d179dSJan Kara int err = 0; 2376884d179dSJan Kara 2377884d179dSJan Kara mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); 2378884d179dSJan Kara if (!sb_has_quota_active(sb, type)) { 2379884d179dSJan Kara err = -ESRCH; 2380884d179dSJan Kara goto out; 2381884d179dSJan Kara } 2382884d179dSJan Kara mi = sb_dqopt(sb)->info + type; 2383884d179dSJan Kara spin_lock(&dq_data_lock); 2384884d179dSJan Kara if (ii->dqi_valid & IIF_BGRACE) 2385884d179dSJan Kara mi->dqi_bgrace = ii->dqi_bgrace; 2386884d179dSJan Kara if (ii->dqi_valid & IIF_IGRACE) 2387884d179dSJan Kara mi->dqi_igrace = ii->dqi_igrace; 2388884d179dSJan Kara if (ii->dqi_valid & IIF_FLAGS) 2389268157baSJan Kara mi->dqi_flags = (mi->dqi_flags & ~DQF_MASK) | 2390268157baSJan Kara (ii->dqi_flags & DQF_MASK); 2391884d179dSJan Kara spin_unlock(&dq_data_lock); 2392884d179dSJan Kara mark_info_dirty(sb, type); 2393884d179dSJan Kara /* Force write to disk */ 2394884d179dSJan Kara sb->dq_op->write_info(sb, type); 2395884d179dSJan Kara out: 2396884d179dSJan Kara mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); 2397884d179dSJan Kara return err; 2398884d179dSJan Kara } 2399884d179dSJan Kara EXPORT_SYMBOL(vfs_set_dqinfo); 2400884d179dSJan Kara 24010d54b217SAlexey Dobriyan const struct quotactl_ops vfs_quotactl_ops = { 2402884d179dSJan Kara .quota_on = vfs_quota_on, 2403884d179dSJan Kara .quota_off = vfs_quota_off, 2404884d179dSJan Kara .quota_sync = vfs_quota_sync, 2405884d179dSJan Kara .get_info = vfs_get_dqinfo, 2406884d179dSJan Kara .set_info = vfs_set_dqinfo, 2407884d179dSJan Kara .get_dqblk = vfs_get_dqblk, 2408884d179dSJan Kara .set_dqblk = vfs_set_dqblk 2409884d179dSJan Kara }; 2410884d179dSJan Kara 2411884d179dSJan Kara static ctl_table fs_dqstats_table[] = { 2412884d179dSJan Kara { 2413884d179dSJan Kara .procname = "lookups", 2414884d179dSJan Kara .data = &dqstats.lookups, 2415884d179dSJan Kara .maxlen = sizeof(int), 2416884d179dSJan Kara .mode = 0444, 24176d456111SEric W. Biederman .proc_handler = proc_dointvec, 2418884d179dSJan Kara }, 2419884d179dSJan Kara { 2420884d179dSJan Kara .procname = "drops", 2421884d179dSJan Kara .data = &dqstats.drops, 2422884d179dSJan Kara .maxlen = sizeof(int), 2423884d179dSJan Kara .mode = 0444, 24246d456111SEric W. Biederman .proc_handler = proc_dointvec, 2425884d179dSJan Kara }, 2426884d179dSJan Kara { 2427884d179dSJan Kara .procname = "reads", 2428884d179dSJan Kara .data = &dqstats.reads, 2429884d179dSJan Kara .maxlen = sizeof(int), 2430884d179dSJan Kara .mode = 0444, 24316d456111SEric W. Biederman .proc_handler = proc_dointvec, 2432884d179dSJan Kara }, 2433884d179dSJan Kara { 2434884d179dSJan Kara .procname = "writes", 2435884d179dSJan Kara .data = &dqstats.writes, 2436884d179dSJan Kara .maxlen = sizeof(int), 2437884d179dSJan Kara .mode = 0444, 24386d456111SEric W. Biederman .proc_handler = proc_dointvec, 2439884d179dSJan Kara }, 2440884d179dSJan Kara { 2441884d179dSJan Kara .procname = "cache_hits", 2442884d179dSJan Kara .data = &dqstats.cache_hits, 2443884d179dSJan Kara .maxlen = sizeof(int), 2444884d179dSJan Kara .mode = 0444, 24456d456111SEric W. Biederman .proc_handler = proc_dointvec, 2446884d179dSJan Kara }, 2447884d179dSJan Kara { 2448884d179dSJan Kara .procname = "allocated_dquots", 2449884d179dSJan Kara .data = &dqstats.allocated_dquots, 2450884d179dSJan Kara .maxlen = sizeof(int), 2451884d179dSJan Kara .mode = 0444, 24526d456111SEric W. Biederman .proc_handler = proc_dointvec, 2453884d179dSJan Kara }, 2454884d179dSJan Kara { 2455884d179dSJan Kara .procname = "free_dquots", 2456884d179dSJan Kara .data = &dqstats.free_dquots, 2457884d179dSJan Kara .maxlen = sizeof(int), 2458884d179dSJan Kara .mode = 0444, 24596d456111SEric W. Biederman .proc_handler = proc_dointvec, 2460884d179dSJan Kara }, 2461884d179dSJan Kara { 2462884d179dSJan Kara .procname = "syncs", 2463884d179dSJan Kara .data = &dqstats.syncs, 2464884d179dSJan Kara .maxlen = sizeof(int), 2465884d179dSJan Kara .mode = 0444, 24666d456111SEric W. Biederman .proc_handler = proc_dointvec, 2467884d179dSJan Kara }, 2468884d179dSJan Kara #ifdef CONFIG_PRINT_QUOTA_WARNING 2469884d179dSJan Kara { 2470884d179dSJan Kara .procname = "warnings", 2471884d179dSJan Kara .data = &flag_print_warnings, 2472884d179dSJan Kara .maxlen = sizeof(int), 2473884d179dSJan Kara .mode = 0644, 24746d456111SEric W. Biederman .proc_handler = proc_dointvec, 2475884d179dSJan Kara }, 2476884d179dSJan Kara #endif 2477ab09203eSEric W. Biederman { }, 2478884d179dSJan Kara }; 2479884d179dSJan Kara 2480884d179dSJan Kara static ctl_table fs_table[] = { 2481884d179dSJan Kara { 2482884d179dSJan Kara .procname = "quota", 2483884d179dSJan Kara .mode = 0555, 2484884d179dSJan Kara .child = fs_dqstats_table, 2485884d179dSJan Kara }, 2486ab09203eSEric W. Biederman { }, 2487884d179dSJan Kara }; 2488884d179dSJan Kara 2489884d179dSJan Kara static ctl_table sys_table[] = { 2490884d179dSJan Kara { 2491884d179dSJan Kara .procname = "fs", 2492884d179dSJan Kara .mode = 0555, 2493884d179dSJan Kara .child = fs_table, 2494884d179dSJan Kara }, 2495ab09203eSEric W. Biederman { }, 2496884d179dSJan Kara }; 2497884d179dSJan Kara 2498884d179dSJan Kara static int __init dquot_init(void) 2499884d179dSJan Kara { 2500884d179dSJan Kara int i; 2501884d179dSJan Kara unsigned long nr_hash, order; 2502884d179dSJan Kara 2503884d179dSJan Kara printk(KERN_NOTICE "VFS: Disk quotas %s\n", __DQUOT_VERSION__); 2504884d179dSJan Kara 2505884d179dSJan Kara register_sysctl_table(sys_table); 2506884d179dSJan Kara 2507884d179dSJan Kara dquot_cachep = kmem_cache_create("dquot", 2508884d179dSJan Kara sizeof(struct dquot), sizeof(unsigned long) * 4, 2509884d179dSJan Kara (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| 2510884d179dSJan Kara SLAB_MEM_SPREAD|SLAB_PANIC), 2511884d179dSJan Kara NULL); 2512884d179dSJan Kara 2513884d179dSJan Kara order = 0; 2514884d179dSJan Kara dquot_hash = (struct hlist_head *)__get_free_pages(GFP_ATOMIC, order); 2515884d179dSJan Kara if (!dquot_hash) 2516884d179dSJan Kara panic("Cannot create dquot hash table"); 2517884d179dSJan Kara 2518884d179dSJan Kara /* Find power-of-two hlist_heads which can fit into allocation */ 2519884d179dSJan Kara nr_hash = (1UL << order) * PAGE_SIZE / sizeof(struct hlist_head); 2520884d179dSJan Kara dq_hash_bits = 0; 2521884d179dSJan Kara do { 2522884d179dSJan Kara dq_hash_bits++; 2523884d179dSJan Kara } while (nr_hash >> dq_hash_bits); 2524884d179dSJan Kara dq_hash_bits--; 2525884d179dSJan Kara 2526884d179dSJan Kara nr_hash = 1UL << dq_hash_bits; 2527884d179dSJan Kara dq_hash_mask = nr_hash - 1; 2528884d179dSJan Kara for (i = 0; i < nr_hash; i++) 2529884d179dSJan Kara INIT_HLIST_HEAD(dquot_hash + i); 2530884d179dSJan Kara 2531884d179dSJan Kara printk("Dquot-cache hash table entries: %ld (order %ld, %ld bytes)\n", 2532884d179dSJan Kara nr_hash, order, (PAGE_SIZE << order)); 2533884d179dSJan Kara 2534884d179dSJan Kara register_shrinker(&dqcache_shrinker); 2535884d179dSJan Kara 2536884d179dSJan Kara return 0; 2537884d179dSJan Kara } 2538884d179dSJan Kara module_init(dquot_init); 2539