1884d179dSJan Kara /* 2884d179dSJan Kara * Implementation of the diskquota system for the LINUX operating system. QUOTA 3884d179dSJan Kara * is implemented using the BSD system call interface as the means of 4884d179dSJan Kara * communication with the user level. This file contains the generic routines 5884d179dSJan Kara * called by the different filesystems on allocation of an inode or block. 6884d179dSJan Kara * These routines take care of the administration needed to have a consistent 7884d179dSJan Kara * diskquota tracking system. The ideas of both user and group quotas are based 8884d179dSJan Kara * on the Melbourne quota system as used on BSD derived systems. The internal 9884d179dSJan Kara * implementation is based on one of the several variants of the LINUX 10884d179dSJan Kara * inode-subsystem with added complexity of the diskquota system. 11884d179dSJan Kara * 12884d179dSJan Kara * Author: Marco van Wieringen <mvw@planets.elm.net> 13884d179dSJan Kara * 14884d179dSJan Kara * Fixes: Dmitry Gorodchanin <pgmdsg@ibi.com>, 11 Feb 96 15884d179dSJan Kara * 16884d179dSJan Kara * Revised list management to avoid races 17884d179dSJan Kara * -- Bill Hawes, <whawes@star.net>, 9/98 18884d179dSJan Kara * 19884d179dSJan Kara * Fixed races in dquot_transfer(), dqget() and dquot_alloc_...(). 20884d179dSJan Kara * As the consequence the locking was moved from dquot_decr_...(), 21884d179dSJan Kara * dquot_incr_...() to calling functions. 22884d179dSJan Kara * invalidate_dquots() now writes modified dquots. 23884d179dSJan Kara * Serialized quota_off() and quota_on() for mount point. 24884d179dSJan Kara * Fixed a few bugs in grow_dquots(). 25884d179dSJan Kara * Fixed deadlock in write_dquot() - we no longer account quotas on 26884d179dSJan Kara * quota files 27884d179dSJan Kara * remove_dquot_ref() moved to inode.c - it now traverses through inodes 28884d179dSJan Kara * add_dquot_ref() restarts after blocking 29884d179dSJan Kara * Added check for bogus uid and fixed check for group in quotactl. 30884d179dSJan Kara * Jan Kara, <jack@suse.cz>, sponsored by SuSE CR, 10-11/99 31884d179dSJan Kara * 32884d179dSJan Kara * Used struct list_head instead of own list struct 33884d179dSJan Kara * Invalidation of referenced dquots is no longer possible 34884d179dSJan Kara * Improved free_dquots list management 35884d179dSJan Kara * Quota and i_blocks are now updated in one place to avoid races 36884d179dSJan Kara * Warnings are now delayed so we won't block in critical section 37884d179dSJan Kara * Write updated not to require dquot lock 38884d179dSJan Kara * Jan Kara, <jack@suse.cz>, 9/2000 39884d179dSJan Kara * 40884d179dSJan Kara * Added dynamic quota structure allocation 41884d179dSJan Kara * Jan Kara <jack@suse.cz> 12/2000 42884d179dSJan Kara * 43884d179dSJan Kara * Rewritten quota interface. Implemented new quota format and 44884d179dSJan Kara * formats registering. 45884d179dSJan Kara * Jan Kara, <jack@suse.cz>, 2001,2002 46884d179dSJan Kara * 47884d179dSJan Kara * New SMP locking. 48884d179dSJan Kara * Jan Kara, <jack@suse.cz>, 10/2002 49884d179dSJan Kara * 50884d179dSJan Kara * Added journalled quota support, fix lock inversion problems 51884d179dSJan Kara * Jan Kara, <jack@suse.cz>, 2003,2004 52884d179dSJan Kara * 53884d179dSJan Kara * (C) Copyright 1994 - 1997 Marco van Wieringen 54884d179dSJan Kara */ 55884d179dSJan Kara 56884d179dSJan Kara #include <linux/errno.h> 57884d179dSJan Kara #include <linux/kernel.h> 58884d179dSJan Kara #include <linux/fs.h> 59884d179dSJan Kara #include <linux/mount.h> 60884d179dSJan Kara #include <linux/mm.h> 61884d179dSJan Kara #include <linux/time.h> 62884d179dSJan Kara #include <linux/types.h> 63884d179dSJan Kara #include <linux/string.h> 64884d179dSJan Kara #include <linux/fcntl.h> 65884d179dSJan Kara #include <linux/stat.h> 66884d179dSJan Kara #include <linux/tty.h> 67884d179dSJan Kara #include <linux/file.h> 68884d179dSJan Kara #include <linux/slab.h> 69884d179dSJan Kara #include <linux/sysctl.h> 70884d179dSJan Kara #include <linux/init.h> 71884d179dSJan Kara #include <linux/module.h> 72884d179dSJan Kara #include <linux/proc_fs.h> 73884d179dSJan Kara #include <linux/security.h> 74884d179dSJan Kara #include <linux/kmod.h> 75884d179dSJan Kara #include <linux/namei.h> 76884d179dSJan Kara #include <linux/buffer_head.h> 77884d179dSJan Kara #include <linux/capability.h> 78884d179dSJan Kara #include <linux/quotaops.h> 79884d179dSJan Kara #include <linux/writeback.h> /* for inode_lock, oddly enough.. */ 80884d179dSJan Kara 81884d179dSJan Kara #include <asm/uaccess.h> 82884d179dSJan Kara 83884d179dSJan Kara /* 84884d179dSJan Kara * There are three quota SMP locks. dq_list_lock protects all lists with quotas 85dde95888SDmitry Monakhov * and quota formats. 86884d179dSJan Kara * dq_data_lock protects data from dq_dqb and also mem_dqinfo structures and 87884d179dSJan Kara * also guards consistency of dquot->dq_dqb with inode->i_blocks, i_bytes. 88884d179dSJan Kara * i_blocks and i_bytes updates itself are guarded by i_lock acquired directly 89884d179dSJan Kara * in inode_add_bytes() and inode_sub_bytes(). dq_state_lock protects 90884d179dSJan Kara * modifications of quota state (on quotaon and quotaoff) and readers who care 91884d179dSJan Kara * about latest values take it as well. 92884d179dSJan Kara * 93884d179dSJan Kara * The spinlock ordering is hence: dq_data_lock > dq_list_lock > i_lock, 94884d179dSJan Kara * dq_list_lock > dq_state_lock 95884d179dSJan Kara * 96884d179dSJan Kara * Note that some things (eg. sb pointer, type, id) doesn't change during 97884d179dSJan Kara * the life of the dquot structure and so needn't to be protected by a lock 98884d179dSJan Kara * 99884d179dSJan Kara * Any operation working on dquots via inode pointers must hold dqptr_sem. If 100884d179dSJan Kara * operation is just reading pointers from inode (or not using them at all) the 10126245c94SJan Kara * read lock is enough. If pointers are altered function must hold write lock. 10226245c94SJan Kara * Special care needs to be taken about S_NOQUOTA inode flag (marking that 10326245c94SJan Kara * inode is a quota file). Functions adding pointers from inode to dquots have 10426245c94SJan Kara * to check this flag under dqptr_sem and then (if S_NOQUOTA is not set) they 10526245c94SJan Kara * have to do all pointer modifications before dropping dqptr_sem. This makes 10626245c94SJan Kara * sure they cannot race with quotaon which first sets S_NOQUOTA flag and 10726245c94SJan Kara * then drops all pointers to dquots from an inode. 108884d179dSJan Kara * 109884d179dSJan Kara * Each dquot has its dq_lock mutex. Locked dquots might not be referenced 110884d179dSJan Kara * from inodes (dquot_alloc_space() and such don't check the dq_lock). 111884d179dSJan Kara * Currently dquot is locked only when it is being read to memory (or space for 112884d179dSJan Kara * it is being allocated) on the first dqget() and when it is being released on 113884d179dSJan Kara * the last dqput(). The allocation and release oparations are serialized by 114884d179dSJan Kara * the dq_lock and by checking the use count in dquot_release(). Write 115884d179dSJan Kara * operations on dquots don't hold dq_lock as they copy data under dq_data_lock 116884d179dSJan Kara * spinlock to internal buffers before writing. 117884d179dSJan Kara * 118884d179dSJan Kara * Lock ordering (including related VFS locks) is the following: 119884d179dSJan Kara * i_mutex > dqonoff_sem > journal_lock > dqptr_sem > dquot->dq_lock > 120884d179dSJan Kara * dqio_mutex 121884d179dSJan Kara * The lock ordering of dqptr_sem imposed by quota code is only dqonoff_sem > 122884d179dSJan Kara * dqptr_sem. But filesystem has to count with the fact that functions such as 123884d179dSJan Kara * dquot_alloc_space() acquire dqptr_sem and they usually have to be called 124884d179dSJan Kara * from inside a transaction to keep filesystem consistency after a crash. Also 125884d179dSJan Kara * filesystems usually want to do some IO on dquot from ->mark_dirty which is 126884d179dSJan Kara * called with dqptr_sem held. 127884d179dSJan Kara * i_mutex on quota files is special (it's below dqio_mutex) 128884d179dSJan Kara */ 129884d179dSJan Kara 130c516610cSJan Kara static __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_list_lock); 131c516610cSJan Kara static __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_state_lock); 132c516610cSJan Kara __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_data_lock); 133884d179dSJan Kara EXPORT_SYMBOL(dq_data_lock); 134884d179dSJan Kara 135da8d1ba2SSergey Senozhatsky #if defined(CONFIG_QUOTA_DEBUG) || defined(CONFIG_PRINT_QUOTA_WARNING) 136884d179dSJan Kara static char *quotatypes[] = INITQFNAMES; 137da8d1ba2SSergey Senozhatsky #endif 138884d179dSJan Kara static struct quota_format_type *quota_formats; /* List of registered formats */ 139884d179dSJan Kara static struct quota_module_name module_names[] = INIT_QUOTA_MODULE_NAMES; 140884d179dSJan Kara 141884d179dSJan Kara /* SLAB cache for dquot structures */ 142884d179dSJan Kara static struct kmem_cache *dquot_cachep; 143884d179dSJan Kara 144884d179dSJan Kara int register_quota_format(struct quota_format_type *fmt) 145884d179dSJan Kara { 146884d179dSJan Kara spin_lock(&dq_list_lock); 147884d179dSJan Kara fmt->qf_next = quota_formats; 148884d179dSJan Kara quota_formats = fmt; 149884d179dSJan Kara spin_unlock(&dq_list_lock); 150884d179dSJan Kara return 0; 151884d179dSJan Kara } 152884d179dSJan Kara EXPORT_SYMBOL(register_quota_format); 153884d179dSJan Kara 154884d179dSJan Kara void unregister_quota_format(struct quota_format_type *fmt) 155884d179dSJan Kara { 156884d179dSJan Kara struct quota_format_type **actqf; 157884d179dSJan Kara 158884d179dSJan Kara spin_lock(&dq_list_lock); 159268157baSJan Kara for (actqf = "a_formats; *actqf && *actqf != fmt; 160268157baSJan Kara actqf = &(*actqf)->qf_next) 161268157baSJan Kara ; 162884d179dSJan Kara if (*actqf) 163884d179dSJan Kara *actqf = (*actqf)->qf_next; 164884d179dSJan Kara spin_unlock(&dq_list_lock); 165884d179dSJan Kara } 166884d179dSJan Kara EXPORT_SYMBOL(unregister_quota_format); 167884d179dSJan Kara 168884d179dSJan Kara static struct quota_format_type *find_quota_format(int id) 169884d179dSJan Kara { 170884d179dSJan Kara struct quota_format_type *actqf; 171884d179dSJan Kara 172884d179dSJan Kara spin_lock(&dq_list_lock); 173268157baSJan Kara for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id; 174268157baSJan Kara actqf = actqf->qf_next) 175268157baSJan Kara ; 176884d179dSJan Kara if (!actqf || !try_module_get(actqf->qf_owner)) { 177884d179dSJan Kara int qm; 178884d179dSJan Kara 179884d179dSJan Kara spin_unlock(&dq_list_lock); 180884d179dSJan Kara 181268157baSJan Kara for (qm = 0; module_names[qm].qm_fmt_id && 182268157baSJan Kara module_names[qm].qm_fmt_id != id; qm++) 183268157baSJan Kara ; 184268157baSJan Kara if (!module_names[qm].qm_fmt_id || 185268157baSJan Kara request_module(module_names[qm].qm_mod_name)) 186884d179dSJan Kara return NULL; 187884d179dSJan Kara 188884d179dSJan Kara spin_lock(&dq_list_lock); 189268157baSJan Kara for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id; 190268157baSJan Kara actqf = actqf->qf_next) 191268157baSJan Kara ; 192884d179dSJan Kara if (actqf && !try_module_get(actqf->qf_owner)) 193884d179dSJan Kara actqf = NULL; 194884d179dSJan Kara } 195884d179dSJan Kara spin_unlock(&dq_list_lock); 196884d179dSJan Kara return actqf; 197884d179dSJan Kara } 198884d179dSJan Kara 199884d179dSJan Kara static void put_quota_format(struct quota_format_type *fmt) 200884d179dSJan Kara { 201884d179dSJan Kara module_put(fmt->qf_owner); 202884d179dSJan Kara } 203884d179dSJan Kara 204884d179dSJan Kara /* 205884d179dSJan Kara * Dquot List Management: 206884d179dSJan Kara * The quota code uses three lists for dquot management: the inuse_list, 207884d179dSJan Kara * free_dquots, and dquot_hash[] array. A single dquot structure may be 208884d179dSJan Kara * on all three lists, depending on its current state. 209884d179dSJan Kara * 210884d179dSJan Kara * All dquots are placed to the end of inuse_list when first created, and this 211884d179dSJan Kara * list is used for invalidate operation, which must look at every dquot. 212884d179dSJan Kara * 213884d179dSJan Kara * Unused dquots (dq_count == 0) are added to the free_dquots list when freed, 214884d179dSJan Kara * and this list is searched whenever we need an available dquot. Dquots are 215884d179dSJan Kara * removed from the list as soon as they are used again, and 216884d179dSJan Kara * dqstats.free_dquots gives the number of dquots on the list. When 217884d179dSJan Kara * dquot is invalidated it's completely released from memory. 218884d179dSJan Kara * 219884d179dSJan Kara * Dquots with a specific identity (device, type and id) are placed on 220884d179dSJan Kara * one of the dquot_hash[] hash chains. The provides an efficient search 221884d179dSJan Kara * mechanism to locate a specific dquot. 222884d179dSJan Kara */ 223884d179dSJan Kara 224884d179dSJan Kara static LIST_HEAD(inuse_list); 225884d179dSJan Kara static LIST_HEAD(free_dquots); 226884d179dSJan Kara static unsigned int dq_hash_bits, dq_hash_mask; 227884d179dSJan Kara static struct hlist_head *dquot_hash; 228884d179dSJan Kara 229884d179dSJan Kara struct dqstats dqstats; 230884d179dSJan Kara EXPORT_SYMBOL(dqstats); 231dde95888SDmitry Monakhov #ifdef CONFIG_SMP 232dde95888SDmitry Monakhov struct dqstats *dqstats_pcpu; 233dde95888SDmitry Monakhov EXPORT_SYMBOL(dqstats_pcpu); 234dde95888SDmitry Monakhov #endif 235884d179dSJan Kara 2360a5a9c72SJan Kara static qsize_t inode_get_rsv_space(struct inode *inode); 237871a2931SChristoph Hellwig static void __dquot_initialize(struct inode *inode, int type); 2380a5a9c72SJan Kara 239884d179dSJan Kara static inline unsigned int 240884d179dSJan Kara hashfn(const struct super_block *sb, unsigned int id, int type) 241884d179dSJan Kara { 242884d179dSJan Kara unsigned long tmp; 243884d179dSJan Kara 244884d179dSJan Kara tmp = (((unsigned long)sb>>L1_CACHE_SHIFT) ^ id) * (MAXQUOTAS - type); 245884d179dSJan Kara return (tmp + (tmp >> dq_hash_bits)) & dq_hash_mask; 246884d179dSJan Kara } 247884d179dSJan Kara 248884d179dSJan Kara /* 249884d179dSJan Kara * Following list functions expect dq_list_lock to be held 250884d179dSJan Kara */ 251884d179dSJan Kara static inline void insert_dquot_hash(struct dquot *dquot) 252884d179dSJan Kara { 253268157baSJan Kara struct hlist_head *head; 254268157baSJan Kara head = dquot_hash + hashfn(dquot->dq_sb, dquot->dq_id, dquot->dq_type); 255884d179dSJan Kara hlist_add_head(&dquot->dq_hash, head); 256884d179dSJan Kara } 257884d179dSJan Kara 258884d179dSJan Kara static inline void remove_dquot_hash(struct dquot *dquot) 259884d179dSJan Kara { 260884d179dSJan Kara hlist_del_init(&dquot->dq_hash); 261884d179dSJan Kara } 262884d179dSJan Kara 2637a2435d8SJan Kara static struct dquot *find_dquot(unsigned int hashent, struct super_block *sb, 2647a2435d8SJan Kara unsigned int id, int type) 265884d179dSJan Kara { 266884d179dSJan Kara struct hlist_node *node; 267884d179dSJan Kara struct dquot *dquot; 268884d179dSJan Kara 269884d179dSJan Kara hlist_for_each (node, dquot_hash+hashent) { 270884d179dSJan Kara dquot = hlist_entry(node, struct dquot, dq_hash); 271268157baSJan Kara if (dquot->dq_sb == sb && dquot->dq_id == id && 272268157baSJan Kara dquot->dq_type == type) 273884d179dSJan Kara return dquot; 274884d179dSJan Kara } 275dd6f3c6dSJan Kara return NULL; 276884d179dSJan Kara } 277884d179dSJan Kara 278884d179dSJan Kara /* Add a dquot to the tail of the free list */ 279884d179dSJan Kara static inline void put_dquot_last(struct dquot *dquot) 280884d179dSJan Kara { 281884d179dSJan Kara list_add_tail(&dquot->dq_free, &free_dquots); 282dde95888SDmitry Monakhov dqstats_inc(DQST_FREE_DQUOTS); 283884d179dSJan Kara } 284884d179dSJan Kara 285884d179dSJan Kara static inline void remove_free_dquot(struct dquot *dquot) 286884d179dSJan Kara { 287884d179dSJan Kara if (list_empty(&dquot->dq_free)) 288884d179dSJan Kara return; 289884d179dSJan Kara list_del_init(&dquot->dq_free); 290dde95888SDmitry Monakhov dqstats_dec(DQST_FREE_DQUOTS); 291884d179dSJan Kara } 292884d179dSJan Kara 293884d179dSJan Kara static inline void put_inuse(struct dquot *dquot) 294884d179dSJan Kara { 295884d179dSJan Kara /* We add to the back of inuse list so we don't have to restart 296884d179dSJan Kara * when traversing this list and we block */ 297884d179dSJan Kara list_add_tail(&dquot->dq_inuse, &inuse_list); 298dde95888SDmitry Monakhov dqstats_inc(DQST_ALLOC_DQUOTS); 299884d179dSJan Kara } 300884d179dSJan Kara 301884d179dSJan Kara static inline void remove_inuse(struct dquot *dquot) 302884d179dSJan Kara { 303dde95888SDmitry Monakhov dqstats_dec(DQST_ALLOC_DQUOTS); 304884d179dSJan Kara list_del(&dquot->dq_inuse); 305884d179dSJan Kara } 306884d179dSJan Kara /* 307884d179dSJan Kara * End of list functions needing dq_list_lock 308884d179dSJan Kara */ 309884d179dSJan Kara 310884d179dSJan Kara static void wait_on_dquot(struct dquot *dquot) 311884d179dSJan Kara { 312884d179dSJan Kara mutex_lock(&dquot->dq_lock); 313884d179dSJan Kara mutex_unlock(&dquot->dq_lock); 314884d179dSJan Kara } 315884d179dSJan Kara 316884d179dSJan Kara static inline int dquot_dirty(struct dquot *dquot) 317884d179dSJan Kara { 318884d179dSJan Kara return test_bit(DQ_MOD_B, &dquot->dq_flags); 319884d179dSJan Kara } 320884d179dSJan Kara 321884d179dSJan Kara static inline int mark_dquot_dirty(struct dquot *dquot) 322884d179dSJan Kara { 323884d179dSJan Kara return dquot->dq_sb->dq_op->mark_dirty(dquot); 324884d179dSJan Kara } 325884d179dSJan Kara 326eabf290dSDmitry Monakhov /* Mark dquot dirty in atomic manner, and return it's old dirty flag state */ 327884d179dSJan Kara int dquot_mark_dquot_dirty(struct dquot *dquot) 328884d179dSJan Kara { 329eabf290dSDmitry Monakhov int ret = 1; 330eabf290dSDmitry Monakhov 331eabf290dSDmitry Monakhov /* If quota is dirty already, we don't have to acquire dq_list_lock */ 332eabf290dSDmitry Monakhov if (test_bit(DQ_MOD_B, &dquot->dq_flags)) 333eabf290dSDmitry Monakhov return 1; 334eabf290dSDmitry Monakhov 335884d179dSJan Kara spin_lock(&dq_list_lock); 336eabf290dSDmitry Monakhov if (!test_and_set_bit(DQ_MOD_B, &dquot->dq_flags)) { 337884d179dSJan Kara list_add(&dquot->dq_dirty, &sb_dqopt(dquot->dq_sb)-> 338884d179dSJan Kara info[dquot->dq_type].dqi_dirty_list); 339eabf290dSDmitry Monakhov ret = 0; 340eabf290dSDmitry Monakhov } 341884d179dSJan Kara spin_unlock(&dq_list_lock); 342eabf290dSDmitry Monakhov return ret; 343884d179dSJan Kara } 344884d179dSJan Kara EXPORT_SYMBOL(dquot_mark_dquot_dirty); 345884d179dSJan Kara 346dc52dd3aSDmitry Monakhov /* Dirtify all the dquots - this can block when journalling */ 347dc52dd3aSDmitry Monakhov static inline int mark_all_dquot_dirty(struct dquot * const *dquot) 348dc52dd3aSDmitry Monakhov { 349dc52dd3aSDmitry Monakhov int ret, err, cnt; 350dc52dd3aSDmitry Monakhov 351dc52dd3aSDmitry Monakhov ret = err = 0; 352dc52dd3aSDmitry Monakhov for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 353dc52dd3aSDmitry Monakhov if (dquot[cnt]) 354dc52dd3aSDmitry Monakhov /* Even in case of error we have to continue */ 355dc52dd3aSDmitry Monakhov ret = mark_dquot_dirty(dquot[cnt]); 356dc52dd3aSDmitry Monakhov if (!err) 357dc52dd3aSDmitry Monakhov err = ret; 358dc52dd3aSDmitry Monakhov } 359dc52dd3aSDmitry Monakhov return err; 360dc52dd3aSDmitry Monakhov } 361dc52dd3aSDmitry Monakhov 362dc52dd3aSDmitry Monakhov static inline void dqput_all(struct dquot **dquot) 363dc52dd3aSDmitry Monakhov { 364dc52dd3aSDmitry Monakhov unsigned int cnt; 365dc52dd3aSDmitry Monakhov 366dc52dd3aSDmitry Monakhov for (cnt = 0; cnt < MAXQUOTAS; cnt++) 367dc52dd3aSDmitry Monakhov dqput(dquot[cnt]); 368dc52dd3aSDmitry Monakhov } 369dc52dd3aSDmitry Monakhov 370884d179dSJan Kara /* This function needs dq_list_lock */ 371884d179dSJan Kara static inline int clear_dquot_dirty(struct dquot *dquot) 372884d179dSJan Kara { 373884d179dSJan Kara if (!test_and_clear_bit(DQ_MOD_B, &dquot->dq_flags)) 374884d179dSJan Kara return 0; 375884d179dSJan Kara list_del_init(&dquot->dq_dirty); 376884d179dSJan Kara return 1; 377884d179dSJan Kara } 378884d179dSJan Kara 379884d179dSJan Kara void mark_info_dirty(struct super_block *sb, int type) 380884d179dSJan Kara { 381884d179dSJan Kara set_bit(DQF_INFO_DIRTY_B, &sb_dqopt(sb)->info[type].dqi_flags); 382884d179dSJan Kara } 383884d179dSJan Kara EXPORT_SYMBOL(mark_info_dirty); 384884d179dSJan Kara 385884d179dSJan Kara /* 386884d179dSJan Kara * Read dquot from disk and alloc space for it 387884d179dSJan Kara */ 388884d179dSJan Kara 389884d179dSJan Kara int dquot_acquire(struct dquot *dquot) 390884d179dSJan Kara { 391884d179dSJan Kara int ret = 0, ret2 = 0; 392884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); 393884d179dSJan Kara 394884d179dSJan Kara mutex_lock(&dquot->dq_lock); 395884d179dSJan Kara mutex_lock(&dqopt->dqio_mutex); 396884d179dSJan Kara if (!test_bit(DQ_READ_B, &dquot->dq_flags)) 397884d179dSJan Kara ret = dqopt->ops[dquot->dq_type]->read_dqblk(dquot); 398884d179dSJan Kara if (ret < 0) 399884d179dSJan Kara goto out_iolock; 400884d179dSJan Kara set_bit(DQ_READ_B, &dquot->dq_flags); 401884d179dSJan Kara /* Instantiate dquot if needed */ 402884d179dSJan Kara if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && !dquot->dq_off) { 403884d179dSJan Kara ret = dqopt->ops[dquot->dq_type]->commit_dqblk(dquot); 404884d179dSJan Kara /* Write the info if needed */ 405268157baSJan Kara if (info_dirty(&dqopt->info[dquot->dq_type])) { 406268157baSJan Kara ret2 = dqopt->ops[dquot->dq_type]->write_file_info( 407268157baSJan Kara dquot->dq_sb, dquot->dq_type); 408268157baSJan Kara } 409884d179dSJan Kara if (ret < 0) 410884d179dSJan Kara goto out_iolock; 411884d179dSJan Kara if (ret2 < 0) { 412884d179dSJan Kara ret = ret2; 413884d179dSJan Kara goto out_iolock; 414884d179dSJan Kara } 415884d179dSJan Kara } 416884d179dSJan Kara set_bit(DQ_ACTIVE_B, &dquot->dq_flags); 417884d179dSJan Kara out_iolock: 418884d179dSJan Kara mutex_unlock(&dqopt->dqio_mutex); 419884d179dSJan Kara mutex_unlock(&dquot->dq_lock); 420884d179dSJan Kara return ret; 421884d179dSJan Kara } 422884d179dSJan Kara EXPORT_SYMBOL(dquot_acquire); 423884d179dSJan Kara 424884d179dSJan Kara /* 425884d179dSJan Kara * Write dquot to disk 426884d179dSJan Kara */ 427884d179dSJan Kara int dquot_commit(struct dquot *dquot) 428884d179dSJan Kara { 429884d179dSJan Kara int ret = 0, ret2 = 0; 430884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); 431884d179dSJan Kara 432884d179dSJan Kara mutex_lock(&dqopt->dqio_mutex); 433884d179dSJan Kara spin_lock(&dq_list_lock); 434884d179dSJan Kara if (!clear_dquot_dirty(dquot)) { 435884d179dSJan Kara spin_unlock(&dq_list_lock); 436884d179dSJan Kara goto out_sem; 437884d179dSJan Kara } 438884d179dSJan Kara spin_unlock(&dq_list_lock); 439884d179dSJan Kara /* Inactive dquot can be only if there was error during read/init 440884d179dSJan Kara * => we have better not writing it */ 441884d179dSJan Kara if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { 442884d179dSJan Kara ret = dqopt->ops[dquot->dq_type]->commit_dqblk(dquot); 443268157baSJan Kara if (info_dirty(&dqopt->info[dquot->dq_type])) { 444268157baSJan Kara ret2 = dqopt->ops[dquot->dq_type]->write_file_info( 445268157baSJan Kara dquot->dq_sb, dquot->dq_type); 446268157baSJan Kara } 447884d179dSJan Kara if (ret >= 0) 448884d179dSJan Kara ret = ret2; 449884d179dSJan Kara } 450884d179dSJan Kara out_sem: 451884d179dSJan Kara mutex_unlock(&dqopt->dqio_mutex); 452884d179dSJan Kara return ret; 453884d179dSJan Kara } 454884d179dSJan Kara EXPORT_SYMBOL(dquot_commit); 455884d179dSJan Kara 456884d179dSJan Kara /* 457884d179dSJan Kara * Release dquot 458884d179dSJan Kara */ 459884d179dSJan Kara int dquot_release(struct dquot *dquot) 460884d179dSJan Kara { 461884d179dSJan Kara int ret = 0, ret2 = 0; 462884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); 463884d179dSJan Kara 464884d179dSJan Kara mutex_lock(&dquot->dq_lock); 465884d179dSJan Kara /* Check whether we are not racing with some other dqget() */ 466884d179dSJan Kara if (atomic_read(&dquot->dq_count) > 1) 467884d179dSJan Kara goto out_dqlock; 468884d179dSJan Kara mutex_lock(&dqopt->dqio_mutex); 469884d179dSJan Kara if (dqopt->ops[dquot->dq_type]->release_dqblk) { 470884d179dSJan Kara ret = dqopt->ops[dquot->dq_type]->release_dqblk(dquot); 471884d179dSJan Kara /* Write the info */ 472268157baSJan Kara if (info_dirty(&dqopt->info[dquot->dq_type])) { 473268157baSJan Kara ret2 = dqopt->ops[dquot->dq_type]->write_file_info( 474268157baSJan Kara dquot->dq_sb, dquot->dq_type); 475268157baSJan Kara } 476884d179dSJan Kara if (ret >= 0) 477884d179dSJan Kara ret = ret2; 478884d179dSJan Kara } 479884d179dSJan Kara clear_bit(DQ_ACTIVE_B, &dquot->dq_flags); 480884d179dSJan Kara mutex_unlock(&dqopt->dqio_mutex); 481884d179dSJan Kara out_dqlock: 482884d179dSJan Kara mutex_unlock(&dquot->dq_lock); 483884d179dSJan Kara return ret; 484884d179dSJan Kara } 485884d179dSJan Kara EXPORT_SYMBOL(dquot_release); 486884d179dSJan Kara 487884d179dSJan Kara void dquot_destroy(struct dquot *dquot) 488884d179dSJan Kara { 489884d179dSJan Kara kmem_cache_free(dquot_cachep, dquot); 490884d179dSJan Kara } 491884d179dSJan Kara EXPORT_SYMBOL(dquot_destroy); 492884d179dSJan Kara 493884d179dSJan Kara static inline void do_destroy_dquot(struct dquot *dquot) 494884d179dSJan Kara { 495884d179dSJan Kara dquot->dq_sb->dq_op->destroy_dquot(dquot); 496884d179dSJan Kara } 497884d179dSJan Kara 498884d179dSJan Kara /* Invalidate all dquots on the list. Note that this function is called after 499884d179dSJan Kara * quota is disabled and pointers from inodes removed so there cannot be new 500884d179dSJan Kara * quota users. There can still be some users of quotas due to inodes being 501884d179dSJan Kara * just deleted or pruned by prune_icache() (those are not attached to any 502884d179dSJan Kara * list) or parallel quotactl call. We have to wait for such users. 503884d179dSJan Kara */ 504884d179dSJan Kara static void invalidate_dquots(struct super_block *sb, int type) 505884d179dSJan Kara { 506884d179dSJan Kara struct dquot *dquot, *tmp; 507884d179dSJan Kara 508884d179dSJan Kara restart: 509884d179dSJan Kara spin_lock(&dq_list_lock); 510884d179dSJan Kara list_for_each_entry_safe(dquot, tmp, &inuse_list, dq_inuse) { 511884d179dSJan Kara if (dquot->dq_sb != sb) 512884d179dSJan Kara continue; 513884d179dSJan Kara if (dquot->dq_type != type) 514884d179dSJan Kara continue; 515884d179dSJan Kara /* Wait for dquot users */ 516884d179dSJan Kara if (atomic_read(&dquot->dq_count)) { 517884d179dSJan Kara DEFINE_WAIT(wait); 518884d179dSJan Kara 519884d179dSJan Kara atomic_inc(&dquot->dq_count); 520884d179dSJan Kara prepare_to_wait(&dquot->dq_wait_unused, &wait, 521884d179dSJan Kara TASK_UNINTERRUPTIBLE); 522884d179dSJan Kara spin_unlock(&dq_list_lock); 523884d179dSJan Kara /* Once dqput() wakes us up, we know it's time to free 524884d179dSJan Kara * the dquot. 525884d179dSJan Kara * IMPORTANT: we rely on the fact that there is always 526884d179dSJan Kara * at most one process waiting for dquot to free. 527884d179dSJan Kara * Otherwise dq_count would be > 1 and we would never 528884d179dSJan Kara * wake up. 529884d179dSJan Kara */ 530884d179dSJan Kara if (atomic_read(&dquot->dq_count) > 1) 531884d179dSJan Kara schedule(); 532884d179dSJan Kara finish_wait(&dquot->dq_wait_unused, &wait); 533884d179dSJan Kara dqput(dquot); 534884d179dSJan Kara /* At this moment dquot() need not exist (it could be 535884d179dSJan Kara * reclaimed by prune_dqcache(). Hence we must 536884d179dSJan Kara * restart. */ 537884d179dSJan Kara goto restart; 538884d179dSJan Kara } 539884d179dSJan Kara /* 540884d179dSJan Kara * Quota now has no users and it has been written on last 541884d179dSJan Kara * dqput() 542884d179dSJan Kara */ 543884d179dSJan Kara remove_dquot_hash(dquot); 544884d179dSJan Kara remove_free_dquot(dquot); 545884d179dSJan Kara remove_inuse(dquot); 546884d179dSJan Kara do_destroy_dquot(dquot); 547884d179dSJan Kara } 548884d179dSJan Kara spin_unlock(&dq_list_lock); 549884d179dSJan Kara } 550884d179dSJan Kara 551884d179dSJan Kara /* Call callback for every active dquot on given filesystem */ 552884d179dSJan Kara int dquot_scan_active(struct super_block *sb, 553884d179dSJan Kara int (*fn)(struct dquot *dquot, unsigned long priv), 554884d179dSJan Kara unsigned long priv) 555884d179dSJan Kara { 556884d179dSJan Kara struct dquot *dquot, *old_dquot = NULL; 557884d179dSJan Kara int ret = 0; 558884d179dSJan Kara 559884d179dSJan Kara mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); 560884d179dSJan Kara spin_lock(&dq_list_lock); 561884d179dSJan Kara list_for_each_entry(dquot, &inuse_list, dq_inuse) { 562884d179dSJan Kara if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) 563884d179dSJan Kara continue; 564884d179dSJan Kara if (dquot->dq_sb != sb) 565884d179dSJan Kara continue; 566884d179dSJan Kara /* Now we have active dquot so we can just increase use count */ 567884d179dSJan Kara atomic_inc(&dquot->dq_count); 568884d179dSJan Kara spin_unlock(&dq_list_lock); 569dde95888SDmitry Monakhov dqstats_inc(DQST_LOOKUPS); 570884d179dSJan Kara dqput(old_dquot); 571884d179dSJan Kara old_dquot = dquot; 572884d179dSJan Kara ret = fn(dquot, priv); 573884d179dSJan Kara if (ret < 0) 574884d179dSJan Kara goto out; 575884d179dSJan Kara spin_lock(&dq_list_lock); 576884d179dSJan Kara /* We are safe to continue now because our dquot could not 577884d179dSJan Kara * be moved out of the inuse list while we hold the reference */ 578884d179dSJan Kara } 579884d179dSJan Kara spin_unlock(&dq_list_lock); 580884d179dSJan Kara out: 581884d179dSJan Kara dqput(old_dquot); 582884d179dSJan Kara mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); 583884d179dSJan Kara return ret; 584884d179dSJan Kara } 585884d179dSJan Kara EXPORT_SYMBOL(dquot_scan_active); 586884d179dSJan Kara 587287a8095SChristoph Hellwig int dquot_quota_sync(struct super_block *sb, int type, int wait) 588884d179dSJan Kara { 589884d179dSJan Kara struct list_head *dirty; 590884d179dSJan Kara struct dquot *dquot; 591884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 592884d179dSJan Kara int cnt; 593884d179dSJan Kara 594884d179dSJan Kara mutex_lock(&dqopt->dqonoff_mutex); 595884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 596884d179dSJan Kara if (type != -1 && cnt != type) 597884d179dSJan Kara continue; 598884d179dSJan Kara if (!sb_has_quota_active(sb, cnt)) 599884d179dSJan Kara continue; 600884d179dSJan Kara spin_lock(&dq_list_lock); 601884d179dSJan Kara dirty = &dqopt->info[cnt].dqi_dirty_list; 602884d179dSJan Kara while (!list_empty(dirty)) { 603268157baSJan Kara dquot = list_first_entry(dirty, struct dquot, 604268157baSJan Kara dq_dirty); 605884d179dSJan Kara /* Dirty and inactive can be only bad dquot... */ 606884d179dSJan Kara if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { 607884d179dSJan Kara clear_dquot_dirty(dquot); 608884d179dSJan Kara continue; 609884d179dSJan Kara } 610884d179dSJan Kara /* Now we have active dquot from which someone is 611884d179dSJan Kara * holding reference so we can safely just increase 612884d179dSJan Kara * use count */ 613884d179dSJan Kara atomic_inc(&dquot->dq_count); 614884d179dSJan Kara spin_unlock(&dq_list_lock); 615dde95888SDmitry Monakhov dqstats_inc(DQST_LOOKUPS); 616884d179dSJan Kara sb->dq_op->write_dquot(dquot); 617884d179dSJan Kara dqput(dquot); 618884d179dSJan Kara spin_lock(&dq_list_lock); 619884d179dSJan Kara } 620884d179dSJan Kara spin_unlock(&dq_list_lock); 621884d179dSJan Kara } 622884d179dSJan Kara 623884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 624884d179dSJan Kara if ((cnt == type || type == -1) && sb_has_quota_active(sb, cnt) 625884d179dSJan Kara && info_dirty(&dqopt->info[cnt])) 626884d179dSJan Kara sb->dq_op->write_info(sb, cnt); 627dde95888SDmitry Monakhov dqstats_inc(DQST_SYNCS); 628884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 629884d179dSJan Kara 6305fb324adSChristoph Hellwig if (!wait || (sb_dqopt(sb)->flags & DQUOT_QUOTA_SYS_FILE)) 6315fb324adSChristoph Hellwig return 0; 6325fb324adSChristoph Hellwig 6335fb324adSChristoph Hellwig /* This is not very clever (and fast) but currently I don't know about 6345fb324adSChristoph Hellwig * any other simple way of getting quota data to disk and we must get 6355fb324adSChristoph Hellwig * them there for userspace to be visible... */ 6365fb324adSChristoph Hellwig if (sb->s_op->sync_fs) 6375fb324adSChristoph Hellwig sb->s_op->sync_fs(sb, 1); 6385fb324adSChristoph Hellwig sync_blockdev(sb->s_bdev); 6395fb324adSChristoph Hellwig 6405fb324adSChristoph Hellwig /* 6415fb324adSChristoph Hellwig * Now when everything is written we can discard the pagecache so 6425fb324adSChristoph Hellwig * that userspace sees the changes. 6435fb324adSChristoph Hellwig */ 6445fb324adSChristoph Hellwig mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); 6455fb324adSChristoph Hellwig for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 6465fb324adSChristoph Hellwig if (type != -1 && cnt != type) 6475fb324adSChristoph Hellwig continue; 6485fb324adSChristoph Hellwig if (!sb_has_quota_active(sb, cnt)) 6495fb324adSChristoph Hellwig continue; 6505fb324adSChristoph Hellwig mutex_lock_nested(&sb_dqopt(sb)->files[cnt]->i_mutex, 6515fb324adSChristoph Hellwig I_MUTEX_QUOTA); 6525fb324adSChristoph Hellwig truncate_inode_pages(&sb_dqopt(sb)->files[cnt]->i_data, 0); 6535fb324adSChristoph Hellwig mutex_unlock(&sb_dqopt(sb)->files[cnt]->i_mutex); 6545fb324adSChristoph Hellwig } 6555fb324adSChristoph Hellwig mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); 6565fb324adSChristoph Hellwig 657884d179dSJan Kara return 0; 658884d179dSJan Kara } 659287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_quota_sync); 660884d179dSJan Kara 661884d179dSJan Kara /* Free unused dquots from cache */ 662884d179dSJan Kara static void prune_dqcache(int count) 663884d179dSJan Kara { 664884d179dSJan Kara struct list_head *head; 665884d179dSJan Kara struct dquot *dquot; 666884d179dSJan Kara 667884d179dSJan Kara head = free_dquots.prev; 668884d179dSJan Kara while (head != &free_dquots && count) { 669884d179dSJan Kara dquot = list_entry(head, struct dquot, dq_free); 670884d179dSJan Kara remove_dquot_hash(dquot); 671884d179dSJan Kara remove_free_dquot(dquot); 672884d179dSJan Kara remove_inuse(dquot); 673884d179dSJan Kara do_destroy_dquot(dquot); 674884d179dSJan Kara count--; 675884d179dSJan Kara head = free_dquots.prev; 676884d179dSJan Kara } 677884d179dSJan Kara } 678884d179dSJan Kara 679dde95888SDmitry Monakhov static int dqstats_read(unsigned int type) 680dde95888SDmitry Monakhov { 681dde95888SDmitry Monakhov int count = 0; 682dde95888SDmitry Monakhov #ifdef CONFIG_SMP 683dde95888SDmitry Monakhov int cpu; 684dde95888SDmitry Monakhov for_each_possible_cpu(cpu) 685dde95888SDmitry Monakhov count += per_cpu_ptr(dqstats_pcpu, cpu)->stat[type]; 686dde95888SDmitry Monakhov /* Statistics reading is racy, but absolute accuracy isn't required */ 687dde95888SDmitry Monakhov if (count < 0) 688dde95888SDmitry Monakhov count = 0; 689dde95888SDmitry Monakhov #else 690dde95888SDmitry Monakhov count = dqstats.stat[type]; 691dde95888SDmitry Monakhov #endif 692dde95888SDmitry Monakhov return count; 693dde95888SDmitry Monakhov } 694dde95888SDmitry Monakhov 695884d179dSJan Kara /* 696884d179dSJan Kara * This is called from kswapd when we think we need some 697884d179dSJan Kara * more memory 698884d179dSJan Kara */ 699884d179dSJan Kara 700884d179dSJan Kara static int shrink_dqcache_memory(int nr, gfp_t gfp_mask) 701884d179dSJan Kara { 702884d179dSJan Kara if (nr) { 703884d179dSJan Kara spin_lock(&dq_list_lock); 704884d179dSJan Kara prune_dqcache(nr); 705884d179dSJan Kara spin_unlock(&dq_list_lock); 706884d179dSJan Kara } 707dde95888SDmitry Monakhov return (dqstats_read(DQST_FREE_DQUOTS)/100) * sysctl_vfs_cache_pressure; 708884d179dSJan Kara } 709884d179dSJan Kara 710884d179dSJan Kara static struct shrinker dqcache_shrinker = { 711884d179dSJan Kara .shrink = shrink_dqcache_memory, 712884d179dSJan Kara .seeks = DEFAULT_SEEKS, 713884d179dSJan Kara }; 714884d179dSJan Kara 715884d179dSJan Kara /* 716884d179dSJan Kara * Put reference to dquot 717884d179dSJan Kara * NOTE: If you change this function please check whether dqput_blocks() works right... 718884d179dSJan Kara */ 719884d179dSJan Kara void dqput(struct dquot *dquot) 720884d179dSJan Kara { 721884d179dSJan Kara int ret; 722884d179dSJan Kara 723884d179dSJan Kara if (!dquot) 724884d179dSJan Kara return; 72562af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 726884d179dSJan Kara if (!atomic_read(&dquot->dq_count)) { 727884d179dSJan Kara printk("VFS: dqput: trying to free free dquot\n"); 728884d179dSJan Kara printk("VFS: device %s, dquot of %s %d\n", 729884d179dSJan Kara dquot->dq_sb->s_id, 730884d179dSJan Kara quotatypes[dquot->dq_type], 731884d179dSJan Kara dquot->dq_id); 732884d179dSJan Kara BUG(); 733884d179dSJan Kara } 734884d179dSJan Kara #endif 735dde95888SDmitry Monakhov dqstats_inc(DQST_DROPS); 736884d179dSJan Kara we_slept: 737884d179dSJan Kara spin_lock(&dq_list_lock); 738884d179dSJan Kara if (atomic_read(&dquot->dq_count) > 1) { 739884d179dSJan Kara /* We have more than one user... nothing to do */ 740884d179dSJan Kara atomic_dec(&dquot->dq_count); 741884d179dSJan Kara /* Releasing dquot during quotaoff phase? */ 742884d179dSJan Kara if (!sb_has_quota_active(dquot->dq_sb, dquot->dq_type) && 743884d179dSJan Kara atomic_read(&dquot->dq_count) == 1) 744884d179dSJan Kara wake_up(&dquot->dq_wait_unused); 745884d179dSJan Kara spin_unlock(&dq_list_lock); 746884d179dSJan Kara return; 747884d179dSJan Kara } 748884d179dSJan Kara /* Need to release dquot? */ 749884d179dSJan Kara if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && dquot_dirty(dquot)) { 750884d179dSJan Kara spin_unlock(&dq_list_lock); 751884d179dSJan Kara /* Commit dquot before releasing */ 752884d179dSJan Kara ret = dquot->dq_sb->dq_op->write_dquot(dquot); 753884d179dSJan Kara if (ret < 0) { 754884d179dSJan Kara printk(KERN_ERR "VFS: cannot write quota structure on " 755884d179dSJan Kara "device %s (error %d). Quota may get out of " 756884d179dSJan Kara "sync!\n", dquot->dq_sb->s_id, ret); 757884d179dSJan Kara /* 758884d179dSJan Kara * We clear dirty bit anyway, so that we avoid 759884d179dSJan Kara * infinite loop here 760884d179dSJan Kara */ 761884d179dSJan Kara spin_lock(&dq_list_lock); 762884d179dSJan Kara clear_dquot_dirty(dquot); 763884d179dSJan Kara spin_unlock(&dq_list_lock); 764884d179dSJan Kara } 765884d179dSJan Kara goto we_slept; 766884d179dSJan Kara } 767884d179dSJan Kara /* Clear flag in case dquot was inactive (something bad happened) */ 768884d179dSJan Kara clear_dquot_dirty(dquot); 769884d179dSJan Kara if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { 770884d179dSJan Kara spin_unlock(&dq_list_lock); 771884d179dSJan Kara dquot->dq_sb->dq_op->release_dquot(dquot); 772884d179dSJan Kara goto we_slept; 773884d179dSJan Kara } 774884d179dSJan Kara atomic_dec(&dquot->dq_count); 77562af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 776884d179dSJan Kara /* sanity check */ 777884d179dSJan Kara BUG_ON(!list_empty(&dquot->dq_free)); 778884d179dSJan Kara #endif 779884d179dSJan Kara put_dquot_last(dquot); 780884d179dSJan Kara spin_unlock(&dq_list_lock); 781884d179dSJan Kara } 782884d179dSJan Kara EXPORT_SYMBOL(dqput); 783884d179dSJan Kara 784884d179dSJan Kara struct dquot *dquot_alloc(struct super_block *sb, int type) 785884d179dSJan Kara { 786884d179dSJan Kara return kmem_cache_zalloc(dquot_cachep, GFP_NOFS); 787884d179dSJan Kara } 788884d179dSJan Kara EXPORT_SYMBOL(dquot_alloc); 789884d179dSJan Kara 790884d179dSJan Kara static struct dquot *get_empty_dquot(struct super_block *sb, int type) 791884d179dSJan Kara { 792884d179dSJan Kara struct dquot *dquot; 793884d179dSJan Kara 794884d179dSJan Kara dquot = sb->dq_op->alloc_dquot(sb, type); 795884d179dSJan Kara if(!dquot) 796dd6f3c6dSJan Kara return NULL; 797884d179dSJan Kara 798884d179dSJan Kara mutex_init(&dquot->dq_lock); 799884d179dSJan Kara INIT_LIST_HEAD(&dquot->dq_free); 800884d179dSJan Kara INIT_LIST_HEAD(&dquot->dq_inuse); 801884d179dSJan Kara INIT_HLIST_NODE(&dquot->dq_hash); 802884d179dSJan Kara INIT_LIST_HEAD(&dquot->dq_dirty); 803884d179dSJan Kara init_waitqueue_head(&dquot->dq_wait_unused); 804884d179dSJan Kara dquot->dq_sb = sb; 805884d179dSJan Kara dquot->dq_type = type; 806884d179dSJan Kara atomic_set(&dquot->dq_count, 1); 807884d179dSJan Kara 808884d179dSJan Kara return dquot; 809884d179dSJan Kara } 810884d179dSJan Kara 811884d179dSJan Kara /* 812884d179dSJan Kara * Get reference to dquot 813884d179dSJan Kara * 814884d179dSJan Kara * Locking is slightly tricky here. We are guarded from parallel quotaoff() 815884d179dSJan Kara * destroying our dquot by: 816884d179dSJan Kara * a) checking for quota flags under dq_list_lock and 817884d179dSJan Kara * b) getting a reference to dquot before we release dq_list_lock 818884d179dSJan Kara */ 819884d179dSJan Kara struct dquot *dqget(struct super_block *sb, unsigned int id, int type) 820884d179dSJan Kara { 821884d179dSJan Kara unsigned int hashent = hashfn(sb, id, type); 822dd6f3c6dSJan Kara struct dquot *dquot = NULL, *empty = NULL; 823884d179dSJan Kara 824884d179dSJan Kara if (!sb_has_quota_active(sb, type)) 825dd6f3c6dSJan Kara return NULL; 826884d179dSJan Kara we_slept: 827884d179dSJan Kara spin_lock(&dq_list_lock); 828884d179dSJan Kara spin_lock(&dq_state_lock); 829884d179dSJan Kara if (!sb_has_quota_active(sb, type)) { 830884d179dSJan Kara spin_unlock(&dq_state_lock); 831884d179dSJan Kara spin_unlock(&dq_list_lock); 832884d179dSJan Kara goto out; 833884d179dSJan Kara } 834884d179dSJan Kara spin_unlock(&dq_state_lock); 835884d179dSJan Kara 836dd6f3c6dSJan Kara dquot = find_dquot(hashent, sb, id, type); 837dd6f3c6dSJan Kara if (!dquot) { 838dd6f3c6dSJan Kara if (!empty) { 839884d179dSJan Kara spin_unlock(&dq_list_lock); 840dd6f3c6dSJan Kara empty = get_empty_dquot(sb, type); 841dd6f3c6dSJan Kara if (!empty) 842884d179dSJan Kara schedule(); /* Try to wait for a moment... */ 843884d179dSJan Kara goto we_slept; 844884d179dSJan Kara } 845884d179dSJan Kara dquot = empty; 846dd6f3c6dSJan Kara empty = NULL; 847884d179dSJan Kara dquot->dq_id = id; 848884d179dSJan Kara /* all dquots go on the inuse_list */ 849884d179dSJan Kara put_inuse(dquot); 850884d179dSJan Kara /* hash it first so it can be found */ 851884d179dSJan Kara insert_dquot_hash(dquot); 852884d179dSJan Kara spin_unlock(&dq_list_lock); 853dde95888SDmitry Monakhov dqstats_inc(DQST_LOOKUPS); 854884d179dSJan Kara } else { 855884d179dSJan Kara if (!atomic_read(&dquot->dq_count)) 856884d179dSJan Kara remove_free_dquot(dquot); 857884d179dSJan Kara atomic_inc(&dquot->dq_count); 858884d179dSJan Kara spin_unlock(&dq_list_lock); 859dde95888SDmitry Monakhov dqstats_inc(DQST_CACHE_HITS); 860dde95888SDmitry Monakhov dqstats_inc(DQST_LOOKUPS); 861884d179dSJan Kara } 862268157baSJan Kara /* Wait for dq_lock - after this we know that either dquot_release() is 863268157baSJan Kara * already finished or it will be canceled due to dq_count > 1 test */ 864884d179dSJan Kara wait_on_dquot(dquot); 865268157baSJan Kara /* Read the dquot / allocate space in quota file */ 866268157baSJan Kara if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && 867268157baSJan Kara sb->dq_op->acquire_dquot(dquot) < 0) { 868884d179dSJan Kara dqput(dquot); 869dd6f3c6dSJan Kara dquot = NULL; 870884d179dSJan Kara goto out; 871884d179dSJan Kara } 87262af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 873884d179dSJan Kara BUG_ON(!dquot->dq_sb); /* Has somebody invalidated entry under us? */ 874884d179dSJan Kara #endif 875884d179dSJan Kara out: 876884d179dSJan Kara if (empty) 877884d179dSJan Kara do_destroy_dquot(empty); 878884d179dSJan Kara 879884d179dSJan Kara return dquot; 880884d179dSJan Kara } 881884d179dSJan Kara EXPORT_SYMBOL(dqget); 882884d179dSJan Kara 883884d179dSJan Kara static int dqinit_needed(struct inode *inode, int type) 884884d179dSJan Kara { 885884d179dSJan Kara int cnt; 886884d179dSJan Kara 887884d179dSJan Kara if (IS_NOQUOTA(inode)) 888884d179dSJan Kara return 0; 889884d179dSJan Kara if (type != -1) 890dd6f3c6dSJan Kara return !inode->i_dquot[type]; 891884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 892dd6f3c6dSJan Kara if (!inode->i_dquot[cnt]) 893884d179dSJan Kara return 1; 894884d179dSJan Kara return 0; 895884d179dSJan Kara } 896884d179dSJan Kara 897884d179dSJan Kara /* This routine is guarded by dqonoff_mutex mutex */ 898884d179dSJan Kara static void add_dquot_ref(struct super_block *sb, int type) 899884d179dSJan Kara { 900884d179dSJan Kara struct inode *inode, *old_inode = NULL; 90162af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 9020a5a9c72SJan Kara int reserved = 0; 9034c5e6c0eSJan Kara #endif 904884d179dSJan Kara 905884d179dSJan Kara spin_lock(&inode_lock); 906884d179dSJan Kara list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { 907b6fac63cSWu Fengguang if (inode->i_state & (I_FREEING|I_CLEAR|I_WILL_FREE|I_NEW)) 9083ae5080fSLinus Torvalds continue; 90962af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 9100a5a9c72SJan Kara if (unlikely(inode_get_rsv_space(inode) > 0)) 9110a5a9c72SJan Kara reserved = 1; 9124c5e6c0eSJan Kara #endif 913884d179dSJan Kara if (!atomic_read(&inode->i_writecount)) 914884d179dSJan Kara continue; 915884d179dSJan Kara if (!dqinit_needed(inode, type)) 916884d179dSJan Kara continue; 917884d179dSJan Kara 918884d179dSJan Kara __iget(inode); 919884d179dSJan Kara spin_unlock(&inode_lock); 920884d179dSJan Kara 921884d179dSJan Kara iput(old_inode); 922871a2931SChristoph Hellwig __dquot_initialize(inode, type); 923884d179dSJan Kara /* We hold a reference to 'inode' so it couldn't have been 924884d179dSJan Kara * removed from s_inodes list while we dropped the inode_lock. 925884d179dSJan Kara * We cannot iput the inode now as we can be holding the last 926884d179dSJan Kara * reference and we cannot iput it under inode_lock. So we 927884d179dSJan Kara * keep the reference and iput it later. */ 928884d179dSJan Kara old_inode = inode; 929884d179dSJan Kara spin_lock(&inode_lock); 930884d179dSJan Kara } 931884d179dSJan Kara spin_unlock(&inode_lock); 932884d179dSJan Kara iput(old_inode); 9330a5a9c72SJan Kara 93462af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 9350a5a9c72SJan Kara if (reserved) { 9360a5a9c72SJan Kara printk(KERN_WARNING "VFS (%s): Writes happened before quota" 9370a5a9c72SJan Kara " was turned on thus quota information is probably " 9380a5a9c72SJan Kara "inconsistent. Please run quotacheck(8).\n", sb->s_id); 9390a5a9c72SJan Kara } 9404c5e6c0eSJan Kara #endif 941884d179dSJan Kara } 942884d179dSJan Kara 943268157baSJan Kara /* 944268157baSJan Kara * Return 0 if dqput() won't block. 945268157baSJan Kara * (note that 1 doesn't necessarily mean blocking) 946268157baSJan Kara */ 947884d179dSJan Kara static inline int dqput_blocks(struct dquot *dquot) 948884d179dSJan Kara { 949884d179dSJan Kara if (atomic_read(&dquot->dq_count) <= 1) 950884d179dSJan Kara return 1; 951884d179dSJan Kara return 0; 952884d179dSJan Kara } 953884d179dSJan Kara 954268157baSJan Kara /* 955268157baSJan Kara * Remove references to dquots from inode and add dquot to list for freeing 956268157baSJan Kara * if we have the last referece to dquot 957268157baSJan Kara * We can't race with anybody because we hold dqptr_sem for writing... 958268157baSJan Kara */ 959884d179dSJan Kara static int remove_inode_dquot_ref(struct inode *inode, int type, 960884d179dSJan Kara struct list_head *tofree_head) 961884d179dSJan Kara { 962884d179dSJan Kara struct dquot *dquot = inode->i_dquot[type]; 963884d179dSJan Kara 964dd6f3c6dSJan Kara inode->i_dquot[type] = NULL; 965dd6f3c6dSJan Kara if (dquot) { 966884d179dSJan Kara if (dqput_blocks(dquot)) { 96762af9b52SJan Kara #ifdef CONFIG_QUOTA_DEBUG 968884d179dSJan Kara if (atomic_read(&dquot->dq_count) != 1) 969884d179dSJan Kara printk(KERN_WARNING "VFS: Adding dquot with dq_count %d to dispose list.\n", atomic_read(&dquot->dq_count)); 970884d179dSJan Kara #endif 971884d179dSJan Kara spin_lock(&dq_list_lock); 972268157baSJan Kara /* As dquot must have currently users it can't be on 973268157baSJan Kara * the free list... */ 974268157baSJan Kara list_add(&dquot->dq_free, tofree_head); 975884d179dSJan Kara spin_unlock(&dq_list_lock); 976884d179dSJan Kara return 1; 977884d179dSJan Kara } 978884d179dSJan Kara else 979884d179dSJan Kara dqput(dquot); /* We have guaranteed we won't block */ 980884d179dSJan Kara } 981884d179dSJan Kara return 0; 982884d179dSJan Kara } 983884d179dSJan Kara 984268157baSJan Kara /* 985268157baSJan Kara * Free list of dquots 986268157baSJan Kara * Dquots are removed from inodes and no new references can be got so we are 987268157baSJan Kara * the only ones holding reference 988268157baSJan Kara */ 989884d179dSJan Kara static void put_dquot_list(struct list_head *tofree_head) 990884d179dSJan Kara { 991884d179dSJan Kara struct list_head *act_head; 992884d179dSJan Kara struct dquot *dquot; 993884d179dSJan Kara 994884d179dSJan Kara act_head = tofree_head->next; 995884d179dSJan Kara while (act_head != tofree_head) { 996884d179dSJan Kara dquot = list_entry(act_head, struct dquot, dq_free); 997884d179dSJan Kara act_head = act_head->next; 998268157baSJan Kara /* Remove dquot from the list so we won't have problems... */ 999268157baSJan Kara list_del_init(&dquot->dq_free); 1000884d179dSJan Kara dqput(dquot); 1001884d179dSJan Kara } 1002884d179dSJan Kara } 1003884d179dSJan Kara 1004884d179dSJan Kara static void remove_dquot_ref(struct super_block *sb, int type, 1005884d179dSJan Kara struct list_head *tofree_head) 1006884d179dSJan Kara { 1007884d179dSJan Kara struct inode *inode; 1008884d179dSJan Kara 1009884d179dSJan Kara spin_lock(&inode_lock); 1010884d179dSJan Kara list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { 10113ae5080fSLinus Torvalds /* 10123ae5080fSLinus Torvalds * We have to scan also I_NEW inodes because they can already 10133ae5080fSLinus Torvalds * have quota pointer initialized. Luckily, we need to touch 10143ae5080fSLinus Torvalds * only quota pointers and these have separate locking 10153ae5080fSLinus Torvalds * (dqptr_sem). 10163ae5080fSLinus Torvalds */ 1017884d179dSJan Kara if (!IS_NOQUOTA(inode)) 1018884d179dSJan Kara remove_inode_dquot_ref(inode, type, tofree_head); 1019884d179dSJan Kara } 1020884d179dSJan Kara spin_unlock(&inode_lock); 1021884d179dSJan Kara } 1022884d179dSJan Kara 1023884d179dSJan Kara /* Gather all references from inodes and drop them */ 1024884d179dSJan Kara static void drop_dquot_ref(struct super_block *sb, int type) 1025884d179dSJan Kara { 1026884d179dSJan Kara LIST_HEAD(tofree_head); 1027884d179dSJan Kara 1028884d179dSJan Kara if (sb->dq_op) { 1029884d179dSJan Kara down_write(&sb_dqopt(sb)->dqptr_sem); 1030884d179dSJan Kara remove_dquot_ref(sb, type, &tofree_head); 1031884d179dSJan Kara up_write(&sb_dqopt(sb)->dqptr_sem); 1032884d179dSJan Kara put_dquot_list(&tofree_head); 1033884d179dSJan Kara } 1034884d179dSJan Kara } 1035884d179dSJan Kara 1036884d179dSJan Kara static inline void dquot_incr_inodes(struct dquot *dquot, qsize_t number) 1037884d179dSJan Kara { 1038884d179dSJan Kara dquot->dq_dqb.dqb_curinodes += number; 1039884d179dSJan Kara } 1040884d179dSJan Kara 1041884d179dSJan Kara static inline void dquot_incr_space(struct dquot *dquot, qsize_t number) 1042884d179dSJan Kara { 1043884d179dSJan Kara dquot->dq_dqb.dqb_curspace += number; 1044884d179dSJan Kara } 1045884d179dSJan Kara 1046884d179dSJan Kara static inline void dquot_resv_space(struct dquot *dquot, qsize_t number) 1047884d179dSJan Kara { 1048884d179dSJan Kara dquot->dq_dqb.dqb_rsvspace += number; 1049884d179dSJan Kara } 1050884d179dSJan Kara 1051884d179dSJan Kara /* 1052884d179dSJan Kara * Claim reserved quota space 1053884d179dSJan Kara */ 10540a5a9c72SJan Kara static void dquot_claim_reserved_space(struct dquot *dquot, qsize_t number) 1055884d179dSJan Kara { 10560a5a9c72SJan Kara if (dquot->dq_dqb.dqb_rsvspace < number) { 10570a5a9c72SJan Kara WARN_ON_ONCE(1); 10580a5a9c72SJan Kara number = dquot->dq_dqb.dqb_rsvspace; 10590a5a9c72SJan Kara } 1060884d179dSJan Kara dquot->dq_dqb.dqb_curspace += number; 1061884d179dSJan Kara dquot->dq_dqb.dqb_rsvspace -= number; 1062884d179dSJan Kara } 1063884d179dSJan Kara 1064884d179dSJan Kara static inline 1065884d179dSJan Kara void dquot_free_reserved_space(struct dquot *dquot, qsize_t number) 1066884d179dSJan Kara { 10670a5a9c72SJan Kara if (dquot->dq_dqb.dqb_rsvspace >= number) 1068884d179dSJan Kara dquot->dq_dqb.dqb_rsvspace -= number; 10690a5a9c72SJan Kara else { 10700a5a9c72SJan Kara WARN_ON_ONCE(1); 10710a5a9c72SJan Kara dquot->dq_dqb.dqb_rsvspace = 0; 10720a5a9c72SJan Kara } 1073884d179dSJan Kara } 1074884d179dSJan Kara 10757a2435d8SJan Kara static void dquot_decr_inodes(struct dquot *dquot, qsize_t number) 1076884d179dSJan Kara { 1077884d179dSJan Kara if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE || 1078884d179dSJan Kara dquot->dq_dqb.dqb_curinodes >= number) 1079884d179dSJan Kara dquot->dq_dqb.dqb_curinodes -= number; 1080884d179dSJan Kara else 1081884d179dSJan Kara dquot->dq_dqb.dqb_curinodes = 0; 1082884d179dSJan Kara if (dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit) 1083884d179dSJan Kara dquot->dq_dqb.dqb_itime = (time_t) 0; 1084884d179dSJan Kara clear_bit(DQ_INODES_B, &dquot->dq_flags); 1085884d179dSJan Kara } 1086884d179dSJan Kara 10877a2435d8SJan Kara static void dquot_decr_space(struct dquot *dquot, qsize_t number) 1088884d179dSJan Kara { 1089884d179dSJan Kara if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE || 1090884d179dSJan Kara dquot->dq_dqb.dqb_curspace >= number) 1091884d179dSJan Kara dquot->dq_dqb.dqb_curspace -= number; 1092884d179dSJan Kara else 1093884d179dSJan Kara dquot->dq_dqb.dqb_curspace = 0; 1094884d179dSJan Kara if (dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit) 1095884d179dSJan Kara dquot->dq_dqb.dqb_btime = (time_t) 0; 1096884d179dSJan Kara clear_bit(DQ_BLKS_B, &dquot->dq_flags); 1097884d179dSJan Kara } 1098884d179dSJan Kara 1099884d179dSJan Kara static int warning_issued(struct dquot *dquot, const int warntype) 1100884d179dSJan Kara { 1101884d179dSJan Kara int flag = (warntype == QUOTA_NL_BHARDWARN || 1102884d179dSJan Kara warntype == QUOTA_NL_BSOFTLONGWARN) ? DQ_BLKS_B : 1103884d179dSJan Kara ((warntype == QUOTA_NL_IHARDWARN || 1104884d179dSJan Kara warntype == QUOTA_NL_ISOFTLONGWARN) ? DQ_INODES_B : 0); 1105884d179dSJan Kara 1106884d179dSJan Kara if (!flag) 1107884d179dSJan Kara return 0; 1108884d179dSJan Kara return test_and_set_bit(flag, &dquot->dq_flags); 1109884d179dSJan Kara } 1110884d179dSJan Kara 1111884d179dSJan Kara #ifdef CONFIG_PRINT_QUOTA_WARNING 1112884d179dSJan Kara static int flag_print_warnings = 1; 1113884d179dSJan Kara 11147a2435d8SJan Kara static int need_print_warning(struct dquot *dquot) 1115884d179dSJan Kara { 1116884d179dSJan Kara if (!flag_print_warnings) 1117884d179dSJan Kara return 0; 1118884d179dSJan Kara 1119884d179dSJan Kara switch (dquot->dq_type) { 1120884d179dSJan Kara case USRQUOTA: 1121884d179dSJan Kara return current_fsuid() == dquot->dq_id; 1122884d179dSJan Kara case GRPQUOTA: 1123884d179dSJan Kara return in_group_p(dquot->dq_id); 1124884d179dSJan Kara } 1125884d179dSJan Kara return 0; 1126884d179dSJan Kara } 1127884d179dSJan Kara 1128884d179dSJan Kara /* Print warning to user which exceeded quota */ 1129884d179dSJan Kara static void print_warning(struct dquot *dquot, const int warntype) 1130884d179dSJan Kara { 1131884d179dSJan Kara char *msg = NULL; 1132884d179dSJan Kara struct tty_struct *tty; 1133884d179dSJan Kara 1134884d179dSJan Kara if (warntype == QUOTA_NL_IHARDBELOW || 1135884d179dSJan Kara warntype == QUOTA_NL_ISOFTBELOW || 1136884d179dSJan Kara warntype == QUOTA_NL_BHARDBELOW || 1137884d179dSJan Kara warntype == QUOTA_NL_BSOFTBELOW || !need_print_warning(dquot)) 1138884d179dSJan Kara return; 1139884d179dSJan Kara 1140884d179dSJan Kara tty = get_current_tty(); 1141884d179dSJan Kara if (!tty) 1142884d179dSJan Kara return; 1143884d179dSJan Kara tty_write_message(tty, dquot->dq_sb->s_id); 1144884d179dSJan Kara if (warntype == QUOTA_NL_ISOFTWARN || warntype == QUOTA_NL_BSOFTWARN) 1145884d179dSJan Kara tty_write_message(tty, ": warning, "); 1146884d179dSJan Kara else 1147884d179dSJan Kara tty_write_message(tty, ": write failed, "); 1148884d179dSJan Kara tty_write_message(tty, quotatypes[dquot->dq_type]); 1149884d179dSJan Kara switch (warntype) { 1150884d179dSJan Kara case QUOTA_NL_IHARDWARN: 1151884d179dSJan Kara msg = " file limit reached.\r\n"; 1152884d179dSJan Kara break; 1153884d179dSJan Kara case QUOTA_NL_ISOFTLONGWARN: 1154884d179dSJan Kara msg = " file quota exceeded too long.\r\n"; 1155884d179dSJan Kara break; 1156884d179dSJan Kara case QUOTA_NL_ISOFTWARN: 1157884d179dSJan Kara msg = " file quota exceeded.\r\n"; 1158884d179dSJan Kara break; 1159884d179dSJan Kara case QUOTA_NL_BHARDWARN: 1160884d179dSJan Kara msg = " block limit reached.\r\n"; 1161884d179dSJan Kara break; 1162884d179dSJan Kara case QUOTA_NL_BSOFTLONGWARN: 1163884d179dSJan Kara msg = " block quota exceeded too long.\r\n"; 1164884d179dSJan Kara break; 1165884d179dSJan Kara case QUOTA_NL_BSOFTWARN: 1166884d179dSJan Kara msg = " block quota exceeded.\r\n"; 1167884d179dSJan Kara break; 1168884d179dSJan Kara } 1169884d179dSJan Kara tty_write_message(tty, msg); 1170884d179dSJan Kara tty_kref_put(tty); 1171884d179dSJan Kara } 1172884d179dSJan Kara #endif 1173884d179dSJan Kara 1174884d179dSJan Kara /* 1175884d179dSJan Kara * Write warnings to the console and send warning messages over netlink. 1176884d179dSJan Kara * 1177884d179dSJan Kara * Note that this function can sleep. 1178884d179dSJan Kara */ 11797a2435d8SJan Kara static void flush_warnings(struct dquot *const *dquots, char *warntype) 1180884d179dSJan Kara { 118186e931a3SSteven Whitehouse struct dquot *dq; 1182884d179dSJan Kara int i; 1183884d179dSJan Kara 118486e931a3SSteven Whitehouse for (i = 0; i < MAXQUOTAS; i++) { 118586e931a3SSteven Whitehouse dq = dquots[i]; 118686e931a3SSteven Whitehouse if (dq && warntype[i] != QUOTA_NL_NOWARN && 118786e931a3SSteven Whitehouse !warning_issued(dq, warntype[i])) { 1188884d179dSJan Kara #ifdef CONFIG_PRINT_QUOTA_WARNING 118986e931a3SSteven Whitehouse print_warning(dq, warntype[i]); 1190884d179dSJan Kara #endif 119186e931a3SSteven Whitehouse quota_send_warning(dq->dq_type, dq->dq_id, 119286e931a3SSteven Whitehouse dq->dq_sb->s_dev, warntype[i]); 119386e931a3SSteven Whitehouse } 1194884d179dSJan Kara } 1195884d179dSJan Kara } 1196884d179dSJan Kara 11977a2435d8SJan Kara static int ignore_hardlimit(struct dquot *dquot) 1198884d179dSJan Kara { 1199884d179dSJan Kara struct mem_dqinfo *info = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_type]; 1200884d179dSJan Kara 1201884d179dSJan Kara return capable(CAP_SYS_RESOURCE) && 1202268157baSJan Kara (info->dqi_format->qf_fmt_id != QFMT_VFS_OLD || 1203268157baSJan Kara !(info->dqi_flags & V1_DQF_RSQUASH)); 1204884d179dSJan Kara } 1205884d179dSJan Kara 1206884d179dSJan Kara /* needs dq_data_lock */ 1207884d179dSJan Kara static int check_idq(struct dquot *dquot, qsize_t inodes, char *warntype) 1208884d179dSJan Kara { 1209268157baSJan Kara qsize_t newinodes = dquot->dq_dqb.dqb_curinodes + inodes; 1210268157baSJan Kara 1211884d179dSJan Kara *warntype = QUOTA_NL_NOWARN; 1212884d179dSJan Kara if (!sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_type) || 1213884d179dSJan Kara test_bit(DQ_FAKE_B, &dquot->dq_flags)) 1214efd8f0e6SChristoph Hellwig return 0; 1215884d179dSJan Kara 1216884d179dSJan Kara if (dquot->dq_dqb.dqb_ihardlimit && 1217268157baSJan Kara newinodes > dquot->dq_dqb.dqb_ihardlimit && 1218884d179dSJan Kara !ignore_hardlimit(dquot)) { 1219884d179dSJan Kara *warntype = QUOTA_NL_IHARDWARN; 1220efd8f0e6SChristoph Hellwig return -EDQUOT; 1221884d179dSJan Kara } 1222884d179dSJan Kara 1223884d179dSJan Kara if (dquot->dq_dqb.dqb_isoftlimit && 1224268157baSJan Kara newinodes > dquot->dq_dqb.dqb_isoftlimit && 1225268157baSJan Kara dquot->dq_dqb.dqb_itime && 1226268157baSJan Kara get_seconds() >= dquot->dq_dqb.dqb_itime && 1227884d179dSJan Kara !ignore_hardlimit(dquot)) { 1228884d179dSJan Kara *warntype = QUOTA_NL_ISOFTLONGWARN; 1229efd8f0e6SChristoph Hellwig return -EDQUOT; 1230884d179dSJan Kara } 1231884d179dSJan Kara 1232884d179dSJan Kara if (dquot->dq_dqb.dqb_isoftlimit && 1233268157baSJan Kara newinodes > dquot->dq_dqb.dqb_isoftlimit && 1234884d179dSJan Kara dquot->dq_dqb.dqb_itime == 0) { 1235884d179dSJan Kara *warntype = QUOTA_NL_ISOFTWARN; 1236268157baSJan Kara dquot->dq_dqb.dqb_itime = get_seconds() + 1237268157baSJan Kara sb_dqopt(dquot->dq_sb)->info[dquot->dq_type].dqi_igrace; 1238884d179dSJan Kara } 1239884d179dSJan Kara 1240efd8f0e6SChristoph Hellwig return 0; 1241884d179dSJan Kara } 1242884d179dSJan Kara 1243884d179dSJan Kara /* needs dq_data_lock */ 1244884d179dSJan Kara static int check_bdq(struct dquot *dquot, qsize_t space, int prealloc, char *warntype) 1245884d179dSJan Kara { 1246884d179dSJan Kara qsize_t tspace; 1247268157baSJan Kara struct super_block *sb = dquot->dq_sb; 1248884d179dSJan Kara 1249884d179dSJan Kara *warntype = QUOTA_NL_NOWARN; 1250268157baSJan Kara if (!sb_has_quota_limits_enabled(sb, dquot->dq_type) || 1251884d179dSJan Kara test_bit(DQ_FAKE_B, &dquot->dq_flags)) 1252efd8f0e6SChristoph Hellwig return 0; 1253884d179dSJan Kara 1254884d179dSJan Kara tspace = dquot->dq_dqb.dqb_curspace + dquot->dq_dqb.dqb_rsvspace 1255884d179dSJan Kara + space; 1256884d179dSJan Kara 1257884d179dSJan Kara if (dquot->dq_dqb.dqb_bhardlimit && 1258884d179dSJan Kara tspace > dquot->dq_dqb.dqb_bhardlimit && 1259884d179dSJan Kara !ignore_hardlimit(dquot)) { 1260884d179dSJan Kara if (!prealloc) 1261884d179dSJan Kara *warntype = QUOTA_NL_BHARDWARN; 1262efd8f0e6SChristoph Hellwig return -EDQUOT; 1263884d179dSJan Kara } 1264884d179dSJan Kara 1265884d179dSJan Kara if (dquot->dq_dqb.dqb_bsoftlimit && 1266884d179dSJan Kara tspace > dquot->dq_dqb.dqb_bsoftlimit && 1267268157baSJan Kara dquot->dq_dqb.dqb_btime && 1268268157baSJan Kara get_seconds() >= dquot->dq_dqb.dqb_btime && 1269884d179dSJan Kara !ignore_hardlimit(dquot)) { 1270884d179dSJan Kara if (!prealloc) 1271884d179dSJan Kara *warntype = QUOTA_NL_BSOFTLONGWARN; 1272efd8f0e6SChristoph Hellwig return -EDQUOT; 1273884d179dSJan Kara } 1274884d179dSJan Kara 1275884d179dSJan Kara if (dquot->dq_dqb.dqb_bsoftlimit && 1276884d179dSJan Kara tspace > dquot->dq_dqb.dqb_bsoftlimit && 1277884d179dSJan Kara dquot->dq_dqb.dqb_btime == 0) { 1278884d179dSJan Kara if (!prealloc) { 1279884d179dSJan Kara *warntype = QUOTA_NL_BSOFTWARN; 1280268157baSJan Kara dquot->dq_dqb.dqb_btime = get_seconds() + 1281268157baSJan Kara sb_dqopt(sb)->info[dquot->dq_type].dqi_bgrace; 1282884d179dSJan Kara } 1283884d179dSJan Kara else 1284884d179dSJan Kara /* 1285884d179dSJan Kara * We don't allow preallocation to exceed softlimit so exceeding will 1286884d179dSJan Kara * be always printed 1287884d179dSJan Kara */ 1288efd8f0e6SChristoph Hellwig return -EDQUOT; 1289884d179dSJan Kara } 1290884d179dSJan Kara 1291efd8f0e6SChristoph Hellwig return 0; 1292884d179dSJan Kara } 1293884d179dSJan Kara 1294884d179dSJan Kara static int info_idq_free(struct dquot *dquot, qsize_t inodes) 1295884d179dSJan Kara { 1296268157baSJan Kara qsize_t newinodes; 1297268157baSJan Kara 1298884d179dSJan Kara if (test_bit(DQ_FAKE_B, &dquot->dq_flags) || 1299884d179dSJan Kara dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit || 1300884d179dSJan Kara !sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_type)) 1301884d179dSJan Kara return QUOTA_NL_NOWARN; 1302884d179dSJan Kara 1303268157baSJan Kara newinodes = dquot->dq_dqb.dqb_curinodes - inodes; 1304268157baSJan Kara if (newinodes <= dquot->dq_dqb.dqb_isoftlimit) 1305884d179dSJan Kara return QUOTA_NL_ISOFTBELOW; 1306884d179dSJan Kara if (dquot->dq_dqb.dqb_curinodes >= dquot->dq_dqb.dqb_ihardlimit && 1307268157baSJan Kara newinodes < dquot->dq_dqb.dqb_ihardlimit) 1308884d179dSJan Kara return QUOTA_NL_IHARDBELOW; 1309884d179dSJan Kara return QUOTA_NL_NOWARN; 1310884d179dSJan Kara } 1311884d179dSJan Kara 1312884d179dSJan Kara static int info_bdq_free(struct dquot *dquot, qsize_t space) 1313884d179dSJan Kara { 1314884d179dSJan Kara if (test_bit(DQ_FAKE_B, &dquot->dq_flags) || 1315884d179dSJan Kara dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit) 1316884d179dSJan Kara return QUOTA_NL_NOWARN; 1317884d179dSJan Kara 1318884d179dSJan Kara if (dquot->dq_dqb.dqb_curspace - space <= dquot->dq_dqb.dqb_bsoftlimit) 1319884d179dSJan Kara return QUOTA_NL_BSOFTBELOW; 1320884d179dSJan Kara if (dquot->dq_dqb.dqb_curspace >= dquot->dq_dqb.dqb_bhardlimit && 1321884d179dSJan Kara dquot->dq_dqb.dqb_curspace - space < dquot->dq_dqb.dqb_bhardlimit) 1322884d179dSJan Kara return QUOTA_NL_BHARDBELOW; 1323884d179dSJan Kara return QUOTA_NL_NOWARN; 1324884d179dSJan Kara } 13250a5a9c72SJan Kara 1326884d179dSJan Kara /* 1327884d179dSJan Kara * Initialize quota pointers in inode 1328871a2931SChristoph Hellwig * 1329884d179dSJan Kara * We do things in a bit complicated way but by that we avoid calling 1330884d179dSJan Kara * dqget() and thus filesystem callbacks under dqptr_sem. 1331871a2931SChristoph Hellwig * 1332871a2931SChristoph Hellwig * It is better to call this function outside of any transaction as it 1333871a2931SChristoph Hellwig * might need a lot of space in journal for dquot structure allocation. 1334884d179dSJan Kara */ 1335871a2931SChristoph Hellwig static void __dquot_initialize(struct inode *inode, int type) 1336884d179dSJan Kara { 1337884d179dSJan Kara unsigned int id = 0; 1338871a2931SChristoph Hellwig int cnt; 1339ad1e6e8dSDmitry Monakhov struct dquot *got[MAXQUOTAS]; 1340884d179dSJan Kara struct super_block *sb = inode->i_sb; 13410a5a9c72SJan Kara qsize_t rsv; 1342884d179dSJan Kara 1343884d179dSJan Kara /* First test before acquiring mutex - solves deadlocks when we 1344884d179dSJan Kara * re-enter the quota code and are already holding the mutex */ 1345871a2931SChristoph Hellwig if (!sb_any_quota_active(inode->i_sb) || IS_NOQUOTA(inode)) 1346871a2931SChristoph Hellwig return; 1347884d179dSJan Kara 1348884d179dSJan Kara /* First get references to structures we might need. */ 1349884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1350ad1e6e8dSDmitry Monakhov got[cnt] = NULL; 1351884d179dSJan Kara if (type != -1 && cnt != type) 1352884d179dSJan Kara continue; 1353884d179dSJan Kara switch (cnt) { 1354884d179dSJan Kara case USRQUOTA: 1355884d179dSJan Kara id = inode->i_uid; 1356884d179dSJan Kara break; 1357884d179dSJan Kara case GRPQUOTA: 1358884d179dSJan Kara id = inode->i_gid; 1359884d179dSJan Kara break; 1360884d179dSJan Kara } 1361884d179dSJan Kara got[cnt] = dqget(sb, id, cnt); 1362884d179dSJan Kara } 1363884d179dSJan Kara 1364884d179dSJan Kara down_write(&sb_dqopt(sb)->dqptr_sem); 1365884d179dSJan Kara if (IS_NOQUOTA(inode)) 1366884d179dSJan Kara goto out_err; 1367884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1368884d179dSJan Kara if (type != -1 && cnt != type) 1369884d179dSJan Kara continue; 1370884d179dSJan Kara /* Avoid races with quotaoff() */ 1371884d179dSJan Kara if (!sb_has_quota_active(sb, cnt)) 1372884d179dSJan Kara continue; 1373dd6f3c6dSJan Kara if (!inode->i_dquot[cnt]) { 1374884d179dSJan Kara inode->i_dquot[cnt] = got[cnt]; 1375dd6f3c6dSJan Kara got[cnt] = NULL; 13760a5a9c72SJan Kara /* 13770a5a9c72SJan Kara * Make quota reservation system happy if someone 13780a5a9c72SJan Kara * did a write before quota was turned on 13790a5a9c72SJan Kara */ 13800a5a9c72SJan Kara rsv = inode_get_rsv_space(inode); 13810a5a9c72SJan Kara if (unlikely(rsv)) 13820a5a9c72SJan Kara dquot_resv_space(inode->i_dquot[cnt], rsv); 1383884d179dSJan Kara } 1384884d179dSJan Kara } 1385884d179dSJan Kara out_err: 1386884d179dSJan Kara up_write(&sb_dqopt(sb)->dqptr_sem); 1387884d179dSJan Kara /* Drop unused references */ 1388dc52dd3aSDmitry Monakhov dqput_all(got); 1389871a2931SChristoph Hellwig } 1390871a2931SChristoph Hellwig 1391871a2931SChristoph Hellwig void dquot_initialize(struct inode *inode) 1392871a2931SChristoph Hellwig { 1393871a2931SChristoph Hellwig __dquot_initialize(inode, -1); 1394884d179dSJan Kara } 1395884d179dSJan Kara EXPORT_SYMBOL(dquot_initialize); 1396884d179dSJan Kara 1397884d179dSJan Kara /* 1398884d179dSJan Kara * Release all quotas referenced by inode 1399884d179dSJan Kara */ 14009f754758SChristoph Hellwig static void __dquot_drop(struct inode *inode) 1401884d179dSJan Kara { 1402884d179dSJan Kara int cnt; 1403884d179dSJan Kara struct dquot *put[MAXQUOTAS]; 1404884d179dSJan Kara 1405884d179dSJan Kara down_write(&sb_dqopt(inode->i_sb)->dqptr_sem); 1406884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1407884d179dSJan Kara put[cnt] = inode->i_dquot[cnt]; 1408dd6f3c6dSJan Kara inode->i_dquot[cnt] = NULL; 1409884d179dSJan Kara } 1410884d179dSJan Kara up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); 1411dc52dd3aSDmitry Monakhov dqput_all(put); 1412884d179dSJan Kara } 1413884d179dSJan Kara 14149f754758SChristoph Hellwig void dquot_drop(struct inode *inode) 1415884d179dSJan Kara { 1416884d179dSJan Kara int cnt; 14179f754758SChristoph Hellwig 14189f754758SChristoph Hellwig if (IS_NOQUOTA(inode)) 14199f754758SChristoph Hellwig return; 14209f754758SChristoph Hellwig 14219f754758SChristoph Hellwig /* 14229f754758SChristoph Hellwig * Test before calling to rule out calls from proc and such 1423884d179dSJan Kara * where we are not allowed to block. Note that this is 1424884d179dSJan Kara * actually reliable test even without the lock - the caller 1425884d179dSJan Kara * must assure that nobody can come after the DQUOT_DROP and 14269f754758SChristoph Hellwig * add quota pointers back anyway. 14279f754758SChristoph Hellwig */ 14289f754758SChristoph Hellwig for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1429dd6f3c6dSJan Kara if (inode->i_dquot[cnt]) 1430884d179dSJan Kara break; 14319f754758SChristoph Hellwig } 14329f754758SChristoph Hellwig 1433884d179dSJan Kara if (cnt < MAXQUOTAS) 14349f754758SChristoph Hellwig __dquot_drop(inode); 1435884d179dSJan Kara } 14369f754758SChristoph Hellwig EXPORT_SYMBOL(dquot_drop); 1437884d179dSJan Kara 1438884d179dSJan Kara /* 1439fd8fbfc1SDmitry Monakhov * inode_reserved_space is managed internally by quota, and protected by 1440fd8fbfc1SDmitry Monakhov * i_lock similar to i_blocks+i_bytes. 1441fd8fbfc1SDmitry Monakhov */ 1442fd8fbfc1SDmitry Monakhov static qsize_t *inode_reserved_space(struct inode * inode) 1443fd8fbfc1SDmitry Monakhov { 1444fd8fbfc1SDmitry Monakhov /* Filesystem must explicitly define it's own method in order to use 1445fd8fbfc1SDmitry Monakhov * quota reservation interface */ 1446fd8fbfc1SDmitry Monakhov BUG_ON(!inode->i_sb->dq_op->get_reserved_space); 1447fd8fbfc1SDmitry Monakhov return inode->i_sb->dq_op->get_reserved_space(inode); 1448fd8fbfc1SDmitry Monakhov } 1449fd8fbfc1SDmitry Monakhov 1450c469070aSDmitry Monakhov void inode_add_rsv_space(struct inode *inode, qsize_t number) 1451fd8fbfc1SDmitry Monakhov { 1452fd8fbfc1SDmitry Monakhov spin_lock(&inode->i_lock); 1453fd8fbfc1SDmitry Monakhov *inode_reserved_space(inode) += number; 1454fd8fbfc1SDmitry Monakhov spin_unlock(&inode->i_lock); 1455fd8fbfc1SDmitry Monakhov } 1456c469070aSDmitry Monakhov EXPORT_SYMBOL(inode_add_rsv_space); 1457fd8fbfc1SDmitry Monakhov 1458c469070aSDmitry Monakhov void inode_claim_rsv_space(struct inode *inode, qsize_t number) 1459fd8fbfc1SDmitry Monakhov { 1460fd8fbfc1SDmitry Monakhov spin_lock(&inode->i_lock); 1461fd8fbfc1SDmitry Monakhov *inode_reserved_space(inode) -= number; 1462fd8fbfc1SDmitry Monakhov __inode_add_bytes(inode, number); 1463fd8fbfc1SDmitry Monakhov spin_unlock(&inode->i_lock); 1464fd8fbfc1SDmitry Monakhov } 1465c469070aSDmitry Monakhov EXPORT_SYMBOL(inode_claim_rsv_space); 1466fd8fbfc1SDmitry Monakhov 1467c469070aSDmitry Monakhov void inode_sub_rsv_space(struct inode *inode, qsize_t number) 1468fd8fbfc1SDmitry Monakhov { 1469fd8fbfc1SDmitry Monakhov spin_lock(&inode->i_lock); 1470fd8fbfc1SDmitry Monakhov *inode_reserved_space(inode) -= number; 1471fd8fbfc1SDmitry Monakhov spin_unlock(&inode->i_lock); 1472fd8fbfc1SDmitry Monakhov } 1473c469070aSDmitry Monakhov EXPORT_SYMBOL(inode_sub_rsv_space); 1474fd8fbfc1SDmitry Monakhov 1475fd8fbfc1SDmitry Monakhov static qsize_t inode_get_rsv_space(struct inode *inode) 1476fd8fbfc1SDmitry Monakhov { 1477fd8fbfc1SDmitry Monakhov qsize_t ret; 147805b5d898SJan Kara 147905b5d898SJan Kara if (!inode->i_sb->dq_op->get_reserved_space) 148005b5d898SJan Kara return 0; 1481fd8fbfc1SDmitry Monakhov spin_lock(&inode->i_lock); 1482fd8fbfc1SDmitry Monakhov ret = *inode_reserved_space(inode); 1483fd8fbfc1SDmitry Monakhov spin_unlock(&inode->i_lock); 1484fd8fbfc1SDmitry Monakhov return ret; 1485fd8fbfc1SDmitry Monakhov } 1486fd8fbfc1SDmitry Monakhov 1487fd8fbfc1SDmitry Monakhov static void inode_incr_space(struct inode *inode, qsize_t number, 1488fd8fbfc1SDmitry Monakhov int reserve) 1489fd8fbfc1SDmitry Monakhov { 1490fd8fbfc1SDmitry Monakhov if (reserve) 1491fd8fbfc1SDmitry Monakhov inode_add_rsv_space(inode, number); 1492fd8fbfc1SDmitry Monakhov else 1493fd8fbfc1SDmitry Monakhov inode_add_bytes(inode, number); 1494fd8fbfc1SDmitry Monakhov } 1495fd8fbfc1SDmitry Monakhov 1496fd8fbfc1SDmitry Monakhov static void inode_decr_space(struct inode *inode, qsize_t number, int reserve) 1497fd8fbfc1SDmitry Monakhov { 1498fd8fbfc1SDmitry Monakhov if (reserve) 1499fd8fbfc1SDmitry Monakhov inode_sub_rsv_space(inode, number); 1500fd8fbfc1SDmitry Monakhov else 1501fd8fbfc1SDmitry Monakhov inode_sub_bytes(inode, number); 1502fd8fbfc1SDmitry Monakhov } 1503fd8fbfc1SDmitry Monakhov 1504fd8fbfc1SDmitry Monakhov /* 15055dd4056dSChristoph Hellwig * This functions updates i_blocks+i_bytes fields and quota information 15065dd4056dSChristoph Hellwig * (together with appropriate checks). 15075dd4056dSChristoph Hellwig * 15085dd4056dSChristoph Hellwig * NOTE: We absolutely rely on the fact that caller dirties the inode 15095dd4056dSChristoph Hellwig * (usually helpers in quotaops.h care about this) and holds a handle for 15105dd4056dSChristoph Hellwig * the current transaction so that dquot write and inode write go into the 15115dd4056dSChristoph Hellwig * same transaction. 1512884d179dSJan Kara */ 1513884d179dSJan Kara 1514884d179dSJan Kara /* 1515884d179dSJan Kara * This operation can block, but only after everything is updated 1516884d179dSJan Kara */ 1517884d179dSJan Kara int __dquot_alloc_space(struct inode *inode, qsize_t number, 1518884d179dSJan Kara int warn, int reserve) 1519884d179dSJan Kara { 15205dd4056dSChristoph Hellwig int cnt, ret = 0; 1521884d179dSJan Kara char warntype[MAXQUOTAS]; 1522884d179dSJan Kara 1523fd8fbfc1SDmitry Monakhov /* 1524fd8fbfc1SDmitry Monakhov * First test before acquiring mutex - solves deadlocks when we 1525fd8fbfc1SDmitry Monakhov * re-enter the quota code and are already holding the mutex 1526fd8fbfc1SDmitry Monakhov */ 15275dd4056dSChristoph Hellwig if (!sb_any_quota_active(inode->i_sb) || IS_NOQUOTA(inode)) { 1528fd8fbfc1SDmitry Monakhov inode_incr_space(inode, number, reserve); 1529fd8fbfc1SDmitry Monakhov goto out; 1530fd8fbfc1SDmitry Monakhov } 1531fd8fbfc1SDmitry Monakhov 1532fd8fbfc1SDmitry Monakhov down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1533884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 1534884d179dSJan Kara warntype[cnt] = QUOTA_NL_NOWARN; 1535884d179dSJan Kara 1536884d179dSJan Kara spin_lock(&dq_data_lock); 1537884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1538dd6f3c6dSJan Kara if (!inode->i_dquot[cnt]) 1539884d179dSJan Kara continue; 1540efd8f0e6SChristoph Hellwig ret = check_bdq(inode->i_dquot[cnt], number, !warn, 1541efd8f0e6SChristoph Hellwig warntype+cnt); 1542efd8f0e6SChristoph Hellwig if (ret) { 1543fd8fbfc1SDmitry Monakhov spin_unlock(&dq_data_lock); 1544fd8fbfc1SDmitry Monakhov goto out_flush_warn; 1545884d179dSJan Kara } 1546884d179dSJan Kara } 1547884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1548dd6f3c6dSJan Kara if (!inode->i_dquot[cnt]) 1549884d179dSJan Kara continue; 1550884d179dSJan Kara if (reserve) 1551884d179dSJan Kara dquot_resv_space(inode->i_dquot[cnt], number); 1552884d179dSJan Kara else 1553884d179dSJan Kara dquot_incr_space(inode->i_dquot[cnt], number); 1554884d179dSJan Kara } 1555fd8fbfc1SDmitry Monakhov inode_incr_space(inode, number, reserve); 1556884d179dSJan Kara spin_unlock(&dq_data_lock); 1557fd8fbfc1SDmitry Monakhov 1558fd8fbfc1SDmitry Monakhov if (reserve) 1559fd8fbfc1SDmitry Monakhov goto out_flush_warn; 1560dc52dd3aSDmitry Monakhov mark_all_dquot_dirty(inode->i_dquot); 1561fd8fbfc1SDmitry Monakhov out_flush_warn: 1562884d179dSJan Kara flush_warnings(inode->i_dquot, warntype); 1563fd8fbfc1SDmitry Monakhov up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1564fd8fbfc1SDmitry Monakhov out: 1565884d179dSJan Kara return ret; 1566884d179dSJan Kara } 15675dd4056dSChristoph Hellwig EXPORT_SYMBOL(__dquot_alloc_space); 1568884d179dSJan Kara 1569884d179dSJan Kara /* 1570884d179dSJan Kara * This operation can block, but only after everything is updated 1571884d179dSJan Kara */ 157263936ddaSChristoph Hellwig int dquot_alloc_inode(const struct inode *inode) 1573884d179dSJan Kara { 1574efd8f0e6SChristoph Hellwig int cnt, ret = 0; 1575884d179dSJan Kara char warntype[MAXQUOTAS]; 1576884d179dSJan Kara 1577884d179dSJan Kara /* First test before acquiring mutex - solves deadlocks when we 1578884d179dSJan Kara * re-enter the quota code and are already holding the mutex */ 157963936ddaSChristoph Hellwig if (!sb_any_quota_active(inode->i_sb) || IS_NOQUOTA(inode)) 158063936ddaSChristoph Hellwig return 0; 1581884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 1582884d179dSJan Kara warntype[cnt] = QUOTA_NL_NOWARN; 1583884d179dSJan Kara down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1584884d179dSJan Kara spin_lock(&dq_data_lock); 1585884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1586dd6f3c6dSJan Kara if (!inode->i_dquot[cnt]) 1587884d179dSJan Kara continue; 1588efd8f0e6SChristoph Hellwig ret = check_idq(inode->i_dquot[cnt], 1, warntype + cnt); 1589efd8f0e6SChristoph Hellwig if (ret) 1590884d179dSJan Kara goto warn_put_all; 1591884d179dSJan Kara } 1592884d179dSJan Kara 1593884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1594dd6f3c6dSJan Kara if (!inode->i_dquot[cnt]) 1595884d179dSJan Kara continue; 159663936ddaSChristoph Hellwig dquot_incr_inodes(inode->i_dquot[cnt], 1); 1597884d179dSJan Kara } 1598efd8f0e6SChristoph Hellwig 1599884d179dSJan Kara warn_put_all: 1600884d179dSJan Kara spin_unlock(&dq_data_lock); 160163936ddaSChristoph Hellwig if (ret == 0) 1602dc52dd3aSDmitry Monakhov mark_all_dquot_dirty(inode->i_dquot); 1603884d179dSJan Kara flush_warnings(inode->i_dquot, warntype); 1604884d179dSJan Kara up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1605884d179dSJan Kara return ret; 1606884d179dSJan Kara } 1607884d179dSJan Kara EXPORT_SYMBOL(dquot_alloc_inode); 1608884d179dSJan Kara 16095dd4056dSChristoph Hellwig /* 16105dd4056dSChristoph Hellwig * Convert in-memory reserved quotas to real consumed quotas 16115dd4056dSChristoph Hellwig */ 16125dd4056dSChristoph Hellwig int dquot_claim_space_nodirty(struct inode *inode, qsize_t number) 1613884d179dSJan Kara { 1614884d179dSJan Kara int cnt; 1615884d179dSJan Kara 16165dd4056dSChristoph Hellwig if (!sb_any_quota_active(inode->i_sb) || IS_NOQUOTA(inode)) { 1617fd8fbfc1SDmitry Monakhov inode_claim_rsv_space(inode, number); 16185dd4056dSChristoph Hellwig return 0; 1619884d179dSJan Kara } 1620884d179dSJan Kara 1621884d179dSJan Kara down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1622884d179dSJan Kara spin_lock(&dq_data_lock); 1623884d179dSJan Kara /* Claim reserved quotas to allocated quotas */ 1624884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1625dd6f3c6dSJan Kara if (inode->i_dquot[cnt]) 1626884d179dSJan Kara dquot_claim_reserved_space(inode->i_dquot[cnt], 1627884d179dSJan Kara number); 1628884d179dSJan Kara } 1629884d179dSJan Kara /* Update inode bytes */ 1630fd8fbfc1SDmitry Monakhov inode_claim_rsv_space(inode, number); 1631884d179dSJan Kara spin_unlock(&dq_data_lock); 1632dc52dd3aSDmitry Monakhov mark_all_dquot_dirty(inode->i_dquot); 1633884d179dSJan Kara up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 16345dd4056dSChristoph Hellwig return 0; 1635884d179dSJan Kara } 16365dd4056dSChristoph Hellwig EXPORT_SYMBOL(dquot_claim_space_nodirty); 1637884d179dSJan Kara 1638884d179dSJan Kara /* 1639884d179dSJan Kara * This operation can block, but only after everything is updated 1640884d179dSJan Kara */ 16415dd4056dSChristoph Hellwig void __dquot_free_space(struct inode *inode, qsize_t number, int reserve) 1642884d179dSJan Kara { 1643884d179dSJan Kara unsigned int cnt; 1644884d179dSJan Kara char warntype[MAXQUOTAS]; 1645884d179dSJan Kara 1646884d179dSJan Kara /* First test before acquiring mutex - solves deadlocks when we 1647884d179dSJan Kara * re-enter the quota code and are already holding the mutex */ 16485dd4056dSChristoph Hellwig if (!sb_any_quota_active(inode->i_sb) || IS_NOQUOTA(inode)) { 1649fd8fbfc1SDmitry Monakhov inode_decr_space(inode, number, reserve); 16505dd4056dSChristoph Hellwig return; 1651884d179dSJan Kara } 1652884d179dSJan Kara 1653884d179dSJan Kara down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1654884d179dSJan Kara spin_lock(&dq_data_lock); 1655884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1656dd6f3c6dSJan Kara if (!inode->i_dquot[cnt]) 1657884d179dSJan Kara continue; 1658884d179dSJan Kara warntype[cnt] = info_bdq_free(inode->i_dquot[cnt], number); 1659fd8fbfc1SDmitry Monakhov if (reserve) 1660fd8fbfc1SDmitry Monakhov dquot_free_reserved_space(inode->i_dquot[cnt], number); 1661fd8fbfc1SDmitry Monakhov else 1662884d179dSJan Kara dquot_decr_space(inode->i_dquot[cnt], number); 1663884d179dSJan Kara } 1664fd8fbfc1SDmitry Monakhov inode_decr_space(inode, number, reserve); 1665884d179dSJan Kara spin_unlock(&dq_data_lock); 1666fd8fbfc1SDmitry Monakhov 1667fd8fbfc1SDmitry Monakhov if (reserve) 1668fd8fbfc1SDmitry Monakhov goto out_unlock; 1669dc52dd3aSDmitry Monakhov mark_all_dquot_dirty(inode->i_dquot); 1670fd8fbfc1SDmitry Monakhov out_unlock: 1671884d179dSJan Kara flush_warnings(inode->i_dquot, warntype); 1672884d179dSJan Kara up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1673884d179dSJan Kara } 16745dd4056dSChristoph Hellwig EXPORT_SYMBOL(__dquot_free_space); 1675fd8fbfc1SDmitry Monakhov 1676fd8fbfc1SDmitry Monakhov /* 1677884d179dSJan Kara * This operation can block, but only after everything is updated 1678884d179dSJan Kara */ 167963936ddaSChristoph Hellwig void dquot_free_inode(const struct inode *inode) 1680884d179dSJan Kara { 1681884d179dSJan Kara unsigned int cnt; 1682884d179dSJan Kara char warntype[MAXQUOTAS]; 1683884d179dSJan Kara 1684884d179dSJan Kara /* First test before acquiring mutex - solves deadlocks when we 1685884d179dSJan Kara * re-enter the quota code and are already holding the mutex */ 168663936ddaSChristoph Hellwig if (!sb_any_quota_active(inode->i_sb) || IS_NOQUOTA(inode)) 168763936ddaSChristoph Hellwig return; 1688884d179dSJan Kara 1689884d179dSJan Kara down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1690884d179dSJan Kara spin_lock(&dq_data_lock); 1691884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1692dd6f3c6dSJan Kara if (!inode->i_dquot[cnt]) 1693884d179dSJan Kara continue; 169463936ddaSChristoph Hellwig warntype[cnt] = info_idq_free(inode->i_dquot[cnt], 1); 169563936ddaSChristoph Hellwig dquot_decr_inodes(inode->i_dquot[cnt], 1); 1696884d179dSJan Kara } 1697884d179dSJan Kara spin_unlock(&dq_data_lock); 1698dc52dd3aSDmitry Monakhov mark_all_dquot_dirty(inode->i_dquot); 1699884d179dSJan Kara flush_warnings(inode->i_dquot, warntype); 1700884d179dSJan Kara up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1701884d179dSJan Kara } 1702884d179dSJan Kara EXPORT_SYMBOL(dquot_free_inode); 1703884d179dSJan Kara 1704884d179dSJan Kara /* 1705884d179dSJan Kara * Transfer the number of inode and blocks from one diskquota to an other. 1706bc8e5f07SJan Kara * On success, dquot references in transfer_to are consumed and references 1707bc8e5f07SJan Kara * to original dquots that need to be released are placed there. On failure, 1708bc8e5f07SJan Kara * references are kept untouched. 1709884d179dSJan Kara * 1710884d179dSJan Kara * This operation can block, but only after everything is updated 1711884d179dSJan Kara * A transaction must be started when entering this function. 1712bc8e5f07SJan Kara * 1713884d179dSJan Kara */ 1714bc8e5f07SJan Kara int __dquot_transfer(struct inode *inode, struct dquot **transfer_to) 1715884d179dSJan Kara { 1716884d179dSJan Kara qsize_t space, cur_space; 1717884d179dSJan Kara qsize_t rsv_space = 0; 1718bc8e5f07SJan Kara struct dquot *transfer_from[MAXQUOTAS] = {}; 1719efd8f0e6SChristoph Hellwig int cnt, ret = 0; 1720884d179dSJan Kara char warntype_to[MAXQUOTAS]; 1721884d179dSJan Kara char warntype_from_inodes[MAXQUOTAS], warntype_from_space[MAXQUOTAS]; 1722884d179dSJan Kara 1723884d179dSJan Kara /* First test before acquiring mutex - solves deadlocks when we 1724884d179dSJan Kara * re-enter the quota code and are already holding the mutex */ 1725884d179dSJan Kara if (IS_NOQUOTA(inode)) 1726efd8f0e6SChristoph Hellwig return 0; 1727884d179dSJan Kara /* Initialize the arrays */ 1728bc8e5f07SJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 1729884d179dSJan Kara warntype_to[cnt] = QUOTA_NL_NOWARN; 1730884d179dSJan Kara down_write(&sb_dqopt(inode->i_sb)->dqptr_sem); 1731884d179dSJan Kara if (IS_NOQUOTA(inode)) { /* File without quota accounting? */ 1732884d179dSJan Kara up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); 1733bc8e5f07SJan Kara return 0; 1734884d179dSJan Kara } 1735884d179dSJan Kara spin_lock(&dq_data_lock); 1736884d179dSJan Kara cur_space = inode_get_bytes(inode); 1737fd8fbfc1SDmitry Monakhov rsv_space = inode_get_rsv_space(inode); 1738884d179dSJan Kara space = cur_space + rsv_space; 1739884d179dSJan Kara /* Build the transfer_from list and check the limits */ 1740884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1741dd6f3c6dSJan Kara if (!transfer_to[cnt]) 1742884d179dSJan Kara continue; 1743884d179dSJan Kara transfer_from[cnt] = inode->i_dquot[cnt]; 1744efd8f0e6SChristoph Hellwig ret = check_idq(transfer_to[cnt], 1, warntype_to + cnt); 1745efd8f0e6SChristoph Hellwig if (ret) 1746efd8f0e6SChristoph Hellwig goto over_quota; 1747efd8f0e6SChristoph Hellwig ret = check_bdq(transfer_to[cnt], space, 0, warntype_to + cnt); 1748efd8f0e6SChristoph Hellwig if (ret) 1749884d179dSJan Kara goto over_quota; 1750884d179dSJan Kara } 1751884d179dSJan Kara 1752884d179dSJan Kara /* 1753884d179dSJan Kara * Finally perform the needed transfer from transfer_from to transfer_to 1754884d179dSJan Kara */ 1755884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1756884d179dSJan Kara /* 1757884d179dSJan Kara * Skip changes for same uid or gid or for turned off quota-type. 1758884d179dSJan Kara */ 1759dd6f3c6dSJan Kara if (!transfer_to[cnt]) 1760884d179dSJan Kara continue; 1761884d179dSJan Kara 1762884d179dSJan Kara /* Due to IO error we might not have transfer_from[] structure */ 1763884d179dSJan Kara if (transfer_from[cnt]) { 1764884d179dSJan Kara warntype_from_inodes[cnt] = 1765884d179dSJan Kara info_idq_free(transfer_from[cnt], 1); 1766884d179dSJan Kara warntype_from_space[cnt] = 1767884d179dSJan Kara info_bdq_free(transfer_from[cnt], space); 1768884d179dSJan Kara dquot_decr_inodes(transfer_from[cnt], 1); 1769884d179dSJan Kara dquot_decr_space(transfer_from[cnt], cur_space); 1770884d179dSJan Kara dquot_free_reserved_space(transfer_from[cnt], 1771884d179dSJan Kara rsv_space); 1772884d179dSJan Kara } 1773884d179dSJan Kara 1774884d179dSJan Kara dquot_incr_inodes(transfer_to[cnt], 1); 1775884d179dSJan Kara dquot_incr_space(transfer_to[cnt], cur_space); 1776884d179dSJan Kara dquot_resv_space(transfer_to[cnt], rsv_space); 1777884d179dSJan Kara 1778884d179dSJan Kara inode->i_dquot[cnt] = transfer_to[cnt]; 1779884d179dSJan Kara } 1780884d179dSJan Kara spin_unlock(&dq_data_lock); 1781884d179dSJan Kara up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); 1782884d179dSJan Kara 1783dc52dd3aSDmitry Monakhov mark_all_dquot_dirty(transfer_from); 1784dc52dd3aSDmitry Monakhov mark_all_dquot_dirty(transfer_to); 1785bc8e5f07SJan Kara /* Pass back references to put */ 1786dc52dd3aSDmitry Monakhov for (cnt = 0; cnt < MAXQUOTAS; cnt++) 1787bc8e5f07SJan Kara transfer_to[cnt] = transfer_from[cnt]; 1788bc8e5f07SJan Kara warn: 1789884d179dSJan Kara flush_warnings(transfer_to, warntype_to); 1790884d179dSJan Kara flush_warnings(transfer_from, warntype_from_inodes); 1791884d179dSJan Kara flush_warnings(transfer_from, warntype_from_space); 1792884d179dSJan Kara return ret; 1793884d179dSJan Kara over_quota: 1794884d179dSJan Kara spin_unlock(&dq_data_lock); 1795884d179dSJan Kara up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); 1796bc8e5f07SJan Kara goto warn; 1797884d179dSJan Kara } 1798bc8e5f07SJan Kara EXPORT_SYMBOL(__dquot_transfer); 1799884d179dSJan Kara 18008ddd69d6SDmitry Monakhov /* Wrapper for transferring ownership of an inode for uid/gid only 18018ddd69d6SDmitry Monakhov * Called from FSXXX_setattr() 18028ddd69d6SDmitry Monakhov */ 1803b43fa828SChristoph Hellwig int dquot_transfer(struct inode *inode, struct iattr *iattr) 1804884d179dSJan Kara { 1805bc8e5f07SJan Kara struct dquot *transfer_to[MAXQUOTAS] = {}; 1806bc8e5f07SJan Kara struct super_block *sb = inode->i_sb; 1807bc8e5f07SJan Kara int ret; 18088ddd69d6SDmitry Monakhov 1809bc8e5f07SJan Kara if (!sb_any_quota_active(sb) || IS_NOQUOTA(inode)) 1810884d179dSJan Kara return 0; 1811bc8e5f07SJan Kara 1812bc8e5f07SJan Kara if (iattr->ia_valid & ATTR_UID && iattr->ia_uid != inode->i_uid) 1813bc8e5f07SJan Kara transfer_to[USRQUOTA] = dqget(sb, iattr->ia_uid, USRQUOTA); 1814bc8e5f07SJan Kara if (iattr->ia_valid & ATTR_GID && iattr->ia_gid != inode->i_gid) 1815*4dea4969SJan Kara transfer_to[GRPQUOTA] = dqget(sb, iattr->ia_gid, GRPQUOTA); 1816bc8e5f07SJan Kara 1817bc8e5f07SJan Kara ret = __dquot_transfer(inode, transfer_to); 1818bc8e5f07SJan Kara dqput_all(transfer_to); 1819bc8e5f07SJan Kara return ret; 1820884d179dSJan Kara } 1821b43fa828SChristoph Hellwig EXPORT_SYMBOL(dquot_transfer); 1822884d179dSJan Kara 1823884d179dSJan Kara /* 1824884d179dSJan Kara * Write info of quota file to disk 1825884d179dSJan Kara */ 1826884d179dSJan Kara int dquot_commit_info(struct super_block *sb, int type) 1827884d179dSJan Kara { 1828884d179dSJan Kara int ret; 1829884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 1830884d179dSJan Kara 1831884d179dSJan Kara mutex_lock(&dqopt->dqio_mutex); 1832884d179dSJan Kara ret = dqopt->ops[type]->write_file_info(sb, type); 1833884d179dSJan Kara mutex_unlock(&dqopt->dqio_mutex); 1834884d179dSJan Kara return ret; 1835884d179dSJan Kara } 1836884d179dSJan Kara EXPORT_SYMBOL(dquot_commit_info); 1837884d179dSJan Kara 1838884d179dSJan Kara /* 1839884d179dSJan Kara * Definitions of diskquota operations. 1840884d179dSJan Kara */ 184161e225dcSAlexey Dobriyan const struct dquot_operations dquot_operations = { 1842884d179dSJan Kara .write_dquot = dquot_commit, 1843884d179dSJan Kara .acquire_dquot = dquot_acquire, 1844884d179dSJan Kara .release_dquot = dquot_release, 1845884d179dSJan Kara .mark_dirty = dquot_mark_dquot_dirty, 1846884d179dSJan Kara .write_info = dquot_commit_info, 1847884d179dSJan Kara .alloc_dquot = dquot_alloc, 1848884d179dSJan Kara .destroy_dquot = dquot_destroy, 1849884d179dSJan Kara }; 1850123e9cafSChristoph Hellwig EXPORT_SYMBOL(dquot_operations); 1851884d179dSJan Kara 1852884d179dSJan Kara /* 1853907f4554SChristoph Hellwig * Generic helper for ->open on filesystems supporting disk quotas. 1854907f4554SChristoph Hellwig */ 1855907f4554SChristoph Hellwig int dquot_file_open(struct inode *inode, struct file *file) 1856907f4554SChristoph Hellwig { 1857907f4554SChristoph Hellwig int error; 1858907f4554SChristoph Hellwig 1859907f4554SChristoph Hellwig error = generic_file_open(inode, file); 1860907f4554SChristoph Hellwig if (!error && (file->f_mode & FMODE_WRITE)) 1861871a2931SChristoph Hellwig dquot_initialize(inode); 1862907f4554SChristoph Hellwig return error; 1863907f4554SChristoph Hellwig } 1864907f4554SChristoph Hellwig EXPORT_SYMBOL(dquot_file_open); 1865907f4554SChristoph Hellwig 1866907f4554SChristoph Hellwig /* 1867884d179dSJan Kara * Turn quota off on a device. type == -1 ==> quotaoff for all types (umount) 1868884d179dSJan Kara */ 18690f0dd62fSChristoph Hellwig int dquot_disable(struct super_block *sb, int type, unsigned int flags) 1870884d179dSJan Kara { 1871884d179dSJan Kara int cnt, ret = 0; 1872884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 1873884d179dSJan Kara struct inode *toputinode[MAXQUOTAS]; 1874884d179dSJan Kara 1875884d179dSJan Kara /* Cannot turn off usage accounting without turning off limits, or 1876884d179dSJan Kara * suspend quotas and simultaneously turn quotas off. */ 1877884d179dSJan Kara if ((flags & DQUOT_USAGE_ENABLED && !(flags & DQUOT_LIMITS_ENABLED)) 1878884d179dSJan Kara || (flags & DQUOT_SUSPENDED && flags & (DQUOT_LIMITS_ENABLED | 1879884d179dSJan Kara DQUOT_USAGE_ENABLED))) 1880884d179dSJan Kara return -EINVAL; 1881884d179dSJan Kara 1882884d179dSJan Kara /* We need to serialize quota_off() for device */ 1883884d179dSJan Kara mutex_lock(&dqopt->dqonoff_mutex); 1884884d179dSJan Kara 1885884d179dSJan Kara /* 1886884d179dSJan Kara * Skip everything if there's nothing to do. We have to do this because 1887884d179dSJan Kara * sometimes we are called when fill_super() failed and calling 1888884d179dSJan Kara * sync_fs() in such cases does no good. 1889884d179dSJan Kara */ 1890884d179dSJan Kara if (!sb_any_quota_loaded(sb)) { 1891884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 1892884d179dSJan Kara return 0; 1893884d179dSJan Kara } 1894884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1895884d179dSJan Kara toputinode[cnt] = NULL; 1896884d179dSJan Kara if (type != -1 && cnt != type) 1897884d179dSJan Kara continue; 1898884d179dSJan Kara if (!sb_has_quota_loaded(sb, cnt)) 1899884d179dSJan Kara continue; 1900884d179dSJan Kara 1901884d179dSJan Kara if (flags & DQUOT_SUSPENDED) { 1902884d179dSJan Kara spin_lock(&dq_state_lock); 1903884d179dSJan Kara dqopt->flags |= 1904884d179dSJan Kara dquot_state_flag(DQUOT_SUSPENDED, cnt); 1905884d179dSJan Kara spin_unlock(&dq_state_lock); 1906884d179dSJan Kara } else { 1907884d179dSJan Kara spin_lock(&dq_state_lock); 1908884d179dSJan Kara dqopt->flags &= ~dquot_state_flag(flags, cnt); 1909884d179dSJan Kara /* Turning off suspended quotas? */ 1910884d179dSJan Kara if (!sb_has_quota_loaded(sb, cnt) && 1911884d179dSJan Kara sb_has_quota_suspended(sb, cnt)) { 1912884d179dSJan Kara dqopt->flags &= ~dquot_state_flag( 1913884d179dSJan Kara DQUOT_SUSPENDED, cnt); 1914884d179dSJan Kara spin_unlock(&dq_state_lock); 1915884d179dSJan Kara iput(dqopt->files[cnt]); 1916884d179dSJan Kara dqopt->files[cnt] = NULL; 1917884d179dSJan Kara continue; 1918884d179dSJan Kara } 1919884d179dSJan Kara spin_unlock(&dq_state_lock); 1920884d179dSJan Kara } 1921884d179dSJan Kara 1922884d179dSJan Kara /* We still have to keep quota loaded? */ 1923884d179dSJan Kara if (sb_has_quota_loaded(sb, cnt) && !(flags & DQUOT_SUSPENDED)) 1924884d179dSJan Kara continue; 1925884d179dSJan Kara 1926884d179dSJan Kara /* Note: these are blocking operations */ 1927884d179dSJan Kara drop_dquot_ref(sb, cnt); 1928884d179dSJan Kara invalidate_dquots(sb, cnt); 1929884d179dSJan Kara /* 1930268157baSJan Kara * Now all dquots should be invalidated, all writes done so we 1931268157baSJan Kara * should be only users of the info. No locks needed. 1932884d179dSJan Kara */ 1933884d179dSJan Kara if (info_dirty(&dqopt->info[cnt])) 1934884d179dSJan Kara sb->dq_op->write_info(sb, cnt); 1935884d179dSJan Kara if (dqopt->ops[cnt]->free_file_info) 1936884d179dSJan Kara dqopt->ops[cnt]->free_file_info(sb, cnt); 1937884d179dSJan Kara put_quota_format(dqopt->info[cnt].dqi_format); 1938884d179dSJan Kara 1939884d179dSJan Kara toputinode[cnt] = dqopt->files[cnt]; 1940884d179dSJan Kara if (!sb_has_quota_loaded(sb, cnt)) 1941884d179dSJan Kara dqopt->files[cnt] = NULL; 1942884d179dSJan Kara dqopt->info[cnt].dqi_flags = 0; 1943884d179dSJan Kara dqopt->info[cnt].dqi_igrace = 0; 1944884d179dSJan Kara dqopt->info[cnt].dqi_bgrace = 0; 1945884d179dSJan Kara dqopt->ops[cnt] = NULL; 1946884d179dSJan Kara } 1947884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 1948884d179dSJan Kara 1949884d179dSJan Kara /* Skip syncing and setting flags if quota files are hidden */ 1950884d179dSJan Kara if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) 1951884d179dSJan Kara goto put_inodes; 1952884d179dSJan Kara 1953884d179dSJan Kara /* Sync the superblock so that buffers with quota data are written to 1954884d179dSJan Kara * disk (and so userspace sees correct data afterwards). */ 1955884d179dSJan Kara if (sb->s_op->sync_fs) 1956884d179dSJan Kara sb->s_op->sync_fs(sb, 1); 1957884d179dSJan Kara sync_blockdev(sb->s_bdev); 1958884d179dSJan Kara /* Now the quota files are just ordinary files and we can set the 1959884d179dSJan Kara * inode flags back. Moreover we discard the pagecache so that 1960884d179dSJan Kara * userspace sees the writes we did bypassing the pagecache. We 1961884d179dSJan Kara * must also discard the blockdev buffers so that we see the 1962884d179dSJan Kara * changes done by userspace on the next quotaon() */ 1963884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 1964884d179dSJan Kara if (toputinode[cnt]) { 1965884d179dSJan Kara mutex_lock(&dqopt->dqonoff_mutex); 1966884d179dSJan Kara /* If quota was reenabled in the meantime, we have 1967884d179dSJan Kara * nothing to do */ 1968884d179dSJan Kara if (!sb_has_quota_loaded(sb, cnt)) { 1969268157baSJan Kara mutex_lock_nested(&toputinode[cnt]->i_mutex, 1970268157baSJan Kara I_MUTEX_QUOTA); 1971884d179dSJan Kara toputinode[cnt]->i_flags &= ~(S_IMMUTABLE | 1972884d179dSJan Kara S_NOATIME | S_NOQUOTA); 1973268157baSJan Kara truncate_inode_pages(&toputinode[cnt]->i_data, 1974268157baSJan Kara 0); 1975884d179dSJan Kara mutex_unlock(&toputinode[cnt]->i_mutex); 1976884d179dSJan Kara mark_inode_dirty(toputinode[cnt]); 1977884d179dSJan Kara } 1978884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 1979884d179dSJan Kara } 1980884d179dSJan Kara if (sb->s_bdev) 1981884d179dSJan Kara invalidate_bdev(sb->s_bdev); 1982884d179dSJan Kara put_inodes: 1983884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 1984884d179dSJan Kara if (toputinode[cnt]) { 1985884d179dSJan Kara /* On remount RO, we keep the inode pointer so that we 1986884d179dSJan Kara * can reenable quota on the subsequent remount RW. We 1987884d179dSJan Kara * have to check 'flags' variable and not use sb_has_ 1988884d179dSJan Kara * function because another quotaon / quotaoff could 1989884d179dSJan Kara * change global state before we got here. We refuse 1990884d179dSJan Kara * to suspend quotas when there is pending delete on 1991884d179dSJan Kara * the quota file... */ 1992884d179dSJan Kara if (!(flags & DQUOT_SUSPENDED)) 1993884d179dSJan Kara iput(toputinode[cnt]); 1994884d179dSJan Kara else if (!toputinode[cnt]->i_nlink) 1995884d179dSJan Kara ret = -EBUSY; 1996884d179dSJan Kara } 1997884d179dSJan Kara return ret; 1998884d179dSJan Kara } 19990f0dd62fSChristoph Hellwig EXPORT_SYMBOL(dquot_disable); 2000884d179dSJan Kara 2001287a8095SChristoph Hellwig int dquot_quota_off(struct super_block *sb, int type) 2002884d179dSJan Kara { 20030f0dd62fSChristoph Hellwig return dquot_disable(sb, type, 20040f0dd62fSChristoph Hellwig DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); 2005884d179dSJan Kara } 2006287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_quota_off); 20070f0dd62fSChristoph Hellwig 2008884d179dSJan Kara /* 2009884d179dSJan Kara * Turn quotas on on a device 2010884d179dSJan Kara */ 2011884d179dSJan Kara 2012884d179dSJan Kara /* 2013884d179dSJan Kara * Helper function to turn quotas on when we already have the inode of 2014884d179dSJan Kara * quota file and no quota information is loaded. 2015884d179dSJan Kara */ 2016884d179dSJan Kara static int vfs_load_quota_inode(struct inode *inode, int type, int format_id, 2017884d179dSJan Kara unsigned int flags) 2018884d179dSJan Kara { 2019884d179dSJan Kara struct quota_format_type *fmt = find_quota_format(format_id); 2020884d179dSJan Kara struct super_block *sb = inode->i_sb; 2021884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 2022884d179dSJan Kara int error; 2023884d179dSJan Kara int oldflags = -1; 2024884d179dSJan Kara 2025884d179dSJan Kara if (!fmt) 2026884d179dSJan Kara return -ESRCH; 2027884d179dSJan Kara if (!S_ISREG(inode->i_mode)) { 2028884d179dSJan Kara error = -EACCES; 2029884d179dSJan Kara goto out_fmt; 2030884d179dSJan Kara } 2031884d179dSJan Kara if (IS_RDONLY(inode)) { 2032884d179dSJan Kara error = -EROFS; 2033884d179dSJan Kara goto out_fmt; 2034884d179dSJan Kara } 2035884d179dSJan Kara if (!sb->s_op->quota_write || !sb->s_op->quota_read) { 2036884d179dSJan Kara error = -EINVAL; 2037884d179dSJan Kara goto out_fmt; 2038884d179dSJan Kara } 2039884d179dSJan Kara /* Usage always has to be set... */ 2040884d179dSJan Kara if (!(flags & DQUOT_USAGE_ENABLED)) { 2041884d179dSJan Kara error = -EINVAL; 2042884d179dSJan Kara goto out_fmt; 2043884d179dSJan Kara } 2044884d179dSJan Kara 2045884d179dSJan Kara if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) { 2046ab94c39bSJan Kara /* As we bypass the pagecache we must now flush all the 2047ab94c39bSJan Kara * dirty data and invalidate caches so that kernel sees 2048ab94c39bSJan Kara * changes from userspace. It is not enough to just flush 2049ab94c39bSJan Kara * the quota file since if blocksize < pagesize, invalidation 2050ab94c39bSJan Kara * of the cache could fail because of other unrelated dirty 2051ab94c39bSJan Kara * data */ 2052ab94c39bSJan Kara sync_filesystem(sb); 2053884d179dSJan Kara invalidate_bdev(sb->s_bdev); 2054884d179dSJan Kara } 2055884d179dSJan Kara mutex_lock(&dqopt->dqonoff_mutex); 2056884d179dSJan Kara if (sb_has_quota_loaded(sb, type)) { 2057884d179dSJan Kara error = -EBUSY; 2058884d179dSJan Kara goto out_lock; 2059884d179dSJan Kara } 2060884d179dSJan Kara 2061884d179dSJan Kara if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) { 2062884d179dSJan Kara /* We don't want quota and atime on quota files (deadlocks 2063884d179dSJan Kara * possible) Also nobody should write to the file - we use 2064884d179dSJan Kara * special IO operations which ignore the immutable bit. */ 2065dee86565SJan Kara mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA); 2066268157baSJan Kara oldflags = inode->i_flags & (S_NOATIME | S_IMMUTABLE | 2067268157baSJan Kara S_NOQUOTA); 2068884d179dSJan Kara inode->i_flags |= S_NOQUOTA | S_NOATIME | S_IMMUTABLE; 2069dee86565SJan Kara mutex_unlock(&inode->i_mutex); 207026245c94SJan Kara /* 207126245c94SJan Kara * When S_NOQUOTA is set, remove dquot references as no more 207226245c94SJan Kara * references can be added 207326245c94SJan Kara */ 20749f754758SChristoph Hellwig __dquot_drop(inode); 2075884d179dSJan Kara } 2076884d179dSJan Kara 2077884d179dSJan Kara error = -EIO; 2078884d179dSJan Kara dqopt->files[type] = igrab(inode); 2079884d179dSJan Kara if (!dqopt->files[type]) 2080884d179dSJan Kara goto out_lock; 2081884d179dSJan Kara error = -EINVAL; 2082884d179dSJan Kara if (!fmt->qf_ops->check_quota_file(sb, type)) 2083884d179dSJan Kara goto out_file_init; 2084884d179dSJan Kara 2085884d179dSJan Kara dqopt->ops[type] = fmt->qf_ops; 2086884d179dSJan Kara dqopt->info[type].dqi_format = fmt; 2087884d179dSJan Kara dqopt->info[type].dqi_fmt_id = format_id; 2088884d179dSJan Kara INIT_LIST_HEAD(&dqopt->info[type].dqi_dirty_list); 2089884d179dSJan Kara mutex_lock(&dqopt->dqio_mutex); 2090268157baSJan Kara error = dqopt->ops[type]->read_file_info(sb, type); 2091268157baSJan Kara if (error < 0) { 2092884d179dSJan Kara mutex_unlock(&dqopt->dqio_mutex); 2093884d179dSJan Kara goto out_file_init; 2094884d179dSJan Kara } 2095884d179dSJan Kara mutex_unlock(&dqopt->dqio_mutex); 2096884d179dSJan Kara spin_lock(&dq_state_lock); 2097884d179dSJan Kara dqopt->flags |= dquot_state_flag(flags, type); 2098884d179dSJan Kara spin_unlock(&dq_state_lock); 2099884d179dSJan Kara 2100884d179dSJan Kara add_dquot_ref(sb, type); 2101884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 2102884d179dSJan Kara 2103884d179dSJan Kara return 0; 2104884d179dSJan Kara 2105884d179dSJan Kara out_file_init: 2106884d179dSJan Kara dqopt->files[type] = NULL; 2107884d179dSJan Kara iput(inode); 2108884d179dSJan Kara out_lock: 2109884d179dSJan Kara if (oldflags != -1) { 2110dee86565SJan Kara mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA); 2111884d179dSJan Kara /* Set the flags back (in the case of accidental quotaon() 2112884d179dSJan Kara * on a wrong file we don't want to mess up the flags) */ 2113884d179dSJan Kara inode->i_flags &= ~(S_NOATIME | S_NOQUOTA | S_IMMUTABLE); 2114884d179dSJan Kara inode->i_flags |= oldflags; 2115dee86565SJan Kara mutex_unlock(&inode->i_mutex); 2116884d179dSJan Kara } 2117d01730d7SJiaying Zhang mutex_unlock(&dqopt->dqonoff_mutex); 2118884d179dSJan Kara out_fmt: 2119884d179dSJan Kara put_quota_format(fmt); 2120884d179dSJan Kara 2121884d179dSJan Kara return error; 2122884d179dSJan Kara } 2123884d179dSJan Kara 2124884d179dSJan Kara /* Reenable quotas on remount RW */ 21250f0dd62fSChristoph Hellwig int dquot_resume(struct super_block *sb, int type) 2126884d179dSJan Kara { 2127884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 2128884d179dSJan Kara struct inode *inode; 21290f0dd62fSChristoph Hellwig int ret = 0, cnt; 2130884d179dSJan Kara unsigned int flags; 2131884d179dSJan Kara 21320f0dd62fSChristoph Hellwig for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 21330f0dd62fSChristoph Hellwig if (type != -1 && cnt != type) 21340f0dd62fSChristoph Hellwig continue; 21350f0dd62fSChristoph Hellwig 2136884d179dSJan Kara mutex_lock(&dqopt->dqonoff_mutex); 21370f0dd62fSChristoph Hellwig if (!sb_has_quota_suspended(sb, cnt)) { 2138884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 21390f0dd62fSChristoph Hellwig continue; 2140884d179dSJan Kara } 21410f0dd62fSChristoph Hellwig inode = dqopt->files[cnt]; 21420f0dd62fSChristoph Hellwig dqopt->files[cnt] = NULL; 2143884d179dSJan Kara spin_lock(&dq_state_lock); 2144884d179dSJan Kara flags = dqopt->flags & dquot_state_flag(DQUOT_USAGE_ENABLED | 21450f0dd62fSChristoph Hellwig DQUOT_LIMITS_ENABLED, 21460f0dd62fSChristoph Hellwig cnt); 21470f0dd62fSChristoph Hellwig dqopt->flags &= ~dquot_state_flag(DQUOT_STATE_FLAGS, cnt); 2148884d179dSJan Kara spin_unlock(&dq_state_lock); 2149884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 2150884d179dSJan Kara 21510f0dd62fSChristoph Hellwig flags = dquot_generic_flag(flags, cnt); 21520f0dd62fSChristoph Hellwig ret = vfs_load_quota_inode(inode, cnt, 21530f0dd62fSChristoph Hellwig dqopt->info[cnt].dqi_fmt_id, flags); 2154884d179dSJan Kara iput(inode); 21550f0dd62fSChristoph Hellwig } 2156884d179dSJan Kara 2157884d179dSJan Kara return ret; 2158884d179dSJan Kara } 21590f0dd62fSChristoph Hellwig EXPORT_SYMBOL(dquot_resume); 2160884d179dSJan Kara 2161287a8095SChristoph Hellwig int dquot_quota_on_path(struct super_block *sb, int type, int format_id, 2162884d179dSJan Kara struct path *path) 2163884d179dSJan Kara { 2164884d179dSJan Kara int error = security_quota_on(path->dentry); 2165884d179dSJan Kara if (error) 2166884d179dSJan Kara return error; 2167884d179dSJan Kara /* Quota file not on the same filesystem? */ 2168884d179dSJan Kara if (path->mnt->mnt_sb != sb) 2169884d179dSJan Kara error = -EXDEV; 2170884d179dSJan Kara else 2171884d179dSJan Kara error = vfs_load_quota_inode(path->dentry->d_inode, type, 2172884d179dSJan Kara format_id, DQUOT_USAGE_ENABLED | 2173884d179dSJan Kara DQUOT_LIMITS_ENABLED); 2174884d179dSJan Kara return error; 2175884d179dSJan Kara } 2176287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_quota_on_path); 2177884d179dSJan Kara 2178287a8095SChristoph Hellwig int dquot_quota_on(struct super_block *sb, int type, int format_id, char *name) 2179884d179dSJan Kara { 2180884d179dSJan Kara struct path path; 2181884d179dSJan Kara int error; 2182884d179dSJan Kara 2183884d179dSJan Kara error = kern_path(name, LOOKUP_FOLLOW, &path); 2184884d179dSJan Kara if (!error) { 2185287a8095SChristoph Hellwig error = dquot_quota_on_path(sb, type, format_id, &path); 2186884d179dSJan Kara path_put(&path); 2187884d179dSJan Kara } 2188884d179dSJan Kara return error; 2189884d179dSJan Kara } 2190287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_quota_on); 2191884d179dSJan Kara 2192884d179dSJan Kara /* 2193884d179dSJan Kara * More powerful function for turning on quotas allowing setting 2194884d179dSJan Kara * of individual quota flags 2195884d179dSJan Kara */ 2196287a8095SChristoph Hellwig int dquot_enable(struct inode *inode, int type, int format_id, 2197884d179dSJan Kara unsigned int flags) 2198884d179dSJan Kara { 2199884d179dSJan Kara int ret = 0; 2200884d179dSJan Kara struct super_block *sb = inode->i_sb; 2201884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 2202884d179dSJan Kara 2203884d179dSJan Kara /* Just unsuspend quotas? */ 22040f0dd62fSChristoph Hellwig BUG_ON(flags & DQUOT_SUSPENDED); 22050f0dd62fSChristoph Hellwig 2206884d179dSJan Kara if (!flags) 2207884d179dSJan Kara return 0; 2208884d179dSJan Kara /* Just updating flags needed? */ 2209884d179dSJan Kara if (sb_has_quota_loaded(sb, type)) { 2210884d179dSJan Kara mutex_lock(&dqopt->dqonoff_mutex); 2211884d179dSJan Kara /* Now do a reliable test... */ 2212884d179dSJan Kara if (!sb_has_quota_loaded(sb, type)) { 2213884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 2214884d179dSJan Kara goto load_quota; 2215884d179dSJan Kara } 2216884d179dSJan Kara if (flags & DQUOT_USAGE_ENABLED && 2217884d179dSJan Kara sb_has_quota_usage_enabled(sb, type)) { 2218884d179dSJan Kara ret = -EBUSY; 2219884d179dSJan Kara goto out_lock; 2220884d179dSJan Kara } 2221884d179dSJan Kara if (flags & DQUOT_LIMITS_ENABLED && 2222884d179dSJan Kara sb_has_quota_limits_enabled(sb, type)) { 2223884d179dSJan Kara ret = -EBUSY; 2224884d179dSJan Kara goto out_lock; 2225884d179dSJan Kara } 2226884d179dSJan Kara spin_lock(&dq_state_lock); 2227884d179dSJan Kara sb_dqopt(sb)->flags |= dquot_state_flag(flags, type); 2228884d179dSJan Kara spin_unlock(&dq_state_lock); 2229884d179dSJan Kara out_lock: 2230884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 2231884d179dSJan Kara return ret; 2232884d179dSJan Kara } 2233884d179dSJan Kara 2234884d179dSJan Kara load_quota: 2235884d179dSJan Kara return vfs_load_quota_inode(inode, type, format_id, flags); 2236884d179dSJan Kara } 2237287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_enable); 2238884d179dSJan Kara 2239884d179dSJan Kara /* 2240884d179dSJan Kara * This function is used when filesystem needs to initialize quotas 2241884d179dSJan Kara * during mount time. 2242884d179dSJan Kara */ 2243287a8095SChristoph Hellwig int dquot_quota_on_mount(struct super_block *sb, char *qf_name, 2244884d179dSJan Kara int format_id, int type) 2245884d179dSJan Kara { 2246884d179dSJan Kara struct dentry *dentry; 2247884d179dSJan Kara int error; 2248884d179dSJan Kara 2249c56818d7SJan Kara mutex_lock(&sb->s_root->d_inode->i_mutex); 2250884d179dSJan Kara dentry = lookup_one_len(qf_name, sb->s_root, strlen(qf_name)); 2251c56818d7SJan Kara mutex_unlock(&sb->s_root->d_inode->i_mutex); 2252884d179dSJan Kara if (IS_ERR(dentry)) 2253884d179dSJan Kara return PTR_ERR(dentry); 2254884d179dSJan Kara 2255884d179dSJan Kara if (!dentry->d_inode) { 2256884d179dSJan Kara error = -ENOENT; 2257884d179dSJan Kara goto out; 2258884d179dSJan Kara } 2259884d179dSJan Kara 2260884d179dSJan Kara error = security_quota_on(dentry); 2261884d179dSJan Kara if (!error) 2262884d179dSJan Kara error = vfs_load_quota_inode(dentry->d_inode, type, format_id, 2263884d179dSJan Kara DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); 2264884d179dSJan Kara 2265884d179dSJan Kara out: 2266884d179dSJan Kara dput(dentry); 2267884d179dSJan Kara return error; 2268884d179dSJan Kara } 2269287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_quota_on_mount); 2270884d179dSJan Kara 2271884d179dSJan Kara static inline qsize_t qbtos(qsize_t blocks) 2272884d179dSJan Kara { 2273884d179dSJan Kara return blocks << QIF_DQBLKSIZE_BITS; 2274884d179dSJan Kara } 2275884d179dSJan Kara 2276884d179dSJan Kara static inline qsize_t stoqb(qsize_t space) 2277884d179dSJan Kara { 2278884d179dSJan Kara return (space + QIF_DQBLKSIZE - 1) >> QIF_DQBLKSIZE_BITS; 2279884d179dSJan Kara } 2280884d179dSJan Kara 2281884d179dSJan Kara /* Generic routine for getting common part of quota structure */ 2282b9b2dd36SChristoph Hellwig static void do_get_dqblk(struct dquot *dquot, struct fs_disk_quota *di) 2283884d179dSJan Kara { 2284884d179dSJan Kara struct mem_dqblk *dm = &dquot->dq_dqb; 2285884d179dSJan Kara 2286b9b2dd36SChristoph Hellwig memset(di, 0, sizeof(*di)); 2287b9b2dd36SChristoph Hellwig di->d_version = FS_DQUOT_VERSION; 2288b9b2dd36SChristoph Hellwig di->d_flags = dquot->dq_type == USRQUOTA ? 2289b9b2dd36SChristoph Hellwig XFS_USER_QUOTA : XFS_GROUP_QUOTA; 2290b9b2dd36SChristoph Hellwig di->d_id = dquot->dq_id; 2291b9b2dd36SChristoph Hellwig 2292884d179dSJan Kara spin_lock(&dq_data_lock); 2293b9b2dd36SChristoph Hellwig di->d_blk_hardlimit = stoqb(dm->dqb_bhardlimit); 2294b9b2dd36SChristoph Hellwig di->d_blk_softlimit = stoqb(dm->dqb_bsoftlimit); 2295b9b2dd36SChristoph Hellwig di->d_ino_hardlimit = dm->dqb_ihardlimit; 2296b9b2dd36SChristoph Hellwig di->d_ino_softlimit = dm->dqb_isoftlimit; 2297b9b2dd36SChristoph Hellwig di->d_bcount = dm->dqb_curspace + dm->dqb_rsvspace; 2298b9b2dd36SChristoph Hellwig di->d_icount = dm->dqb_curinodes; 2299b9b2dd36SChristoph Hellwig di->d_btimer = dm->dqb_btime; 2300b9b2dd36SChristoph Hellwig di->d_itimer = dm->dqb_itime; 2301884d179dSJan Kara spin_unlock(&dq_data_lock); 2302884d179dSJan Kara } 2303884d179dSJan Kara 2304287a8095SChristoph Hellwig int dquot_get_dqblk(struct super_block *sb, int type, qid_t id, 2305b9b2dd36SChristoph Hellwig struct fs_disk_quota *di) 2306884d179dSJan Kara { 2307884d179dSJan Kara struct dquot *dquot; 2308884d179dSJan Kara 2309884d179dSJan Kara dquot = dqget(sb, id, type); 2310dd6f3c6dSJan Kara if (!dquot) 2311884d179dSJan Kara return -ESRCH; 2312884d179dSJan Kara do_get_dqblk(dquot, di); 2313884d179dSJan Kara dqput(dquot); 2314884d179dSJan Kara 2315884d179dSJan Kara return 0; 2316884d179dSJan Kara } 2317287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_get_dqblk); 2318884d179dSJan Kara 2319c472b432SChristoph Hellwig #define VFS_FS_DQ_MASK \ 2320c472b432SChristoph Hellwig (FS_DQ_BCOUNT | FS_DQ_BSOFT | FS_DQ_BHARD | \ 2321c472b432SChristoph Hellwig FS_DQ_ICOUNT | FS_DQ_ISOFT | FS_DQ_IHARD | \ 2322c472b432SChristoph Hellwig FS_DQ_BTIMER | FS_DQ_ITIMER) 2323c472b432SChristoph Hellwig 2324884d179dSJan Kara /* Generic routine for setting common part of quota structure */ 2325c472b432SChristoph Hellwig static int do_set_dqblk(struct dquot *dquot, struct fs_disk_quota *di) 2326884d179dSJan Kara { 2327884d179dSJan Kara struct mem_dqblk *dm = &dquot->dq_dqb; 2328884d179dSJan Kara int check_blim = 0, check_ilim = 0; 2329884d179dSJan Kara struct mem_dqinfo *dqi = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_type]; 2330884d179dSJan Kara 2331c472b432SChristoph Hellwig if (di->d_fieldmask & ~VFS_FS_DQ_MASK) 2332c472b432SChristoph Hellwig return -EINVAL; 2333c472b432SChristoph Hellwig 2334c472b432SChristoph Hellwig if (((di->d_fieldmask & FS_DQ_BSOFT) && 2335c472b432SChristoph Hellwig (di->d_blk_softlimit > dqi->dqi_maxblimit)) || 2336c472b432SChristoph Hellwig ((di->d_fieldmask & FS_DQ_BHARD) && 2337c472b432SChristoph Hellwig (di->d_blk_hardlimit > dqi->dqi_maxblimit)) || 2338c472b432SChristoph Hellwig ((di->d_fieldmask & FS_DQ_ISOFT) && 2339c472b432SChristoph Hellwig (di->d_ino_softlimit > dqi->dqi_maxilimit)) || 2340c472b432SChristoph Hellwig ((di->d_fieldmask & FS_DQ_IHARD) && 2341c472b432SChristoph Hellwig (di->d_ino_hardlimit > dqi->dqi_maxilimit))) 2342884d179dSJan Kara return -ERANGE; 2343884d179dSJan Kara 2344884d179dSJan Kara spin_lock(&dq_data_lock); 2345c472b432SChristoph Hellwig if (di->d_fieldmask & FS_DQ_BCOUNT) { 2346c472b432SChristoph Hellwig dm->dqb_curspace = di->d_bcount - dm->dqb_rsvspace; 2347884d179dSJan Kara check_blim = 1; 234808261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags); 2349884d179dSJan Kara } 2350c472b432SChristoph Hellwig 2351c472b432SChristoph Hellwig if (di->d_fieldmask & FS_DQ_BSOFT) 2352c472b432SChristoph Hellwig dm->dqb_bsoftlimit = qbtos(di->d_blk_softlimit); 2353c472b432SChristoph Hellwig if (di->d_fieldmask & FS_DQ_BHARD) 2354c472b432SChristoph Hellwig dm->dqb_bhardlimit = qbtos(di->d_blk_hardlimit); 2355c472b432SChristoph Hellwig if (di->d_fieldmask & (FS_DQ_BSOFT | FS_DQ_BHARD)) { 2356884d179dSJan Kara check_blim = 1; 235708261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags); 2358884d179dSJan Kara } 2359c472b432SChristoph Hellwig 2360c472b432SChristoph Hellwig if (di->d_fieldmask & FS_DQ_ICOUNT) { 2361c472b432SChristoph Hellwig dm->dqb_curinodes = di->d_icount; 2362884d179dSJan Kara check_ilim = 1; 236308261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags); 2364884d179dSJan Kara } 2365c472b432SChristoph Hellwig 2366c472b432SChristoph Hellwig if (di->d_fieldmask & FS_DQ_ISOFT) 2367c472b432SChristoph Hellwig dm->dqb_isoftlimit = di->d_ino_softlimit; 2368c472b432SChristoph Hellwig if (di->d_fieldmask & FS_DQ_IHARD) 2369c472b432SChristoph Hellwig dm->dqb_ihardlimit = di->d_ino_hardlimit; 2370c472b432SChristoph Hellwig if (di->d_fieldmask & (FS_DQ_ISOFT | FS_DQ_IHARD)) { 2371884d179dSJan Kara check_ilim = 1; 237208261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags); 2373884d179dSJan Kara } 2374c472b432SChristoph Hellwig 2375c472b432SChristoph Hellwig if (di->d_fieldmask & FS_DQ_BTIMER) { 2376c472b432SChristoph Hellwig dm->dqb_btime = di->d_btimer; 2377884d179dSJan Kara check_blim = 1; 237808261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags); 2379884d179dSJan Kara } 2380c472b432SChristoph Hellwig 2381c472b432SChristoph Hellwig if (di->d_fieldmask & FS_DQ_ITIMER) { 2382c472b432SChristoph Hellwig dm->dqb_itime = di->d_itimer; 2383884d179dSJan Kara check_ilim = 1; 238408261673SAndrew Perepechko set_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags); 2385884d179dSJan Kara } 2386884d179dSJan Kara 2387884d179dSJan Kara if (check_blim) { 2388268157baSJan Kara if (!dm->dqb_bsoftlimit || 2389268157baSJan Kara dm->dqb_curspace < dm->dqb_bsoftlimit) { 2390884d179dSJan Kara dm->dqb_btime = 0; 2391884d179dSJan Kara clear_bit(DQ_BLKS_B, &dquot->dq_flags); 2392c472b432SChristoph Hellwig } else if (!(di->d_fieldmask & FS_DQ_BTIMER)) 2393268157baSJan Kara /* Set grace only if user hasn't provided his own... */ 2394884d179dSJan Kara dm->dqb_btime = get_seconds() + dqi->dqi_bgrace; 2395884d179dSJan Kara } 2396884d179dSJan Kara if (check_ilim) { 2397268157baSJan Kara if (!dm->dqb_isoftlimit || 2398268157baSJan Kara dm->dqb_curinodes < dm->dqb_isoftlimit) { 2399884d179dSJan Kara dm->dqb_itime = 0; 2400884d179dSJan Kara clear_bit(DQ_INODES_B, &dquot->dq_flags); 2401c472b432SChristoph Hellwig } else if (!(di->d_fieldmask & FS_DQ_ITIMER)) 2402268157baSJan Kara /* Set grace only if user hasn't provided his own... */ 2403884d179dSJan Kara dm->dqb_itime = get_seconds() + dqi->dqi_igrace; 2404884d179dSJan Kara } 2405268157baSJan Kara if (dm->dqb_bhardlimit || dm->dqb_bsoftlimit || dm->dqb_ihardlimit || 2406268157baSJan Kara dm->dqb_isoftlimit) 2407884d179dSJan Kara clear_bit(DQ_FAKE_B, &dquot->dq_flags); 2408884d179dSJan Kara else 2409884d179dSJan Kara set_bit(DQ_FAKE_B, &dquot->dq_flags); 2410884d179dSJan Kara spin_unlock(&dq_data_lock); 2411884d179dSJan Kara mark_dquot_dirty(dquot); 2412884d179dSJan Kara 2413884d179dSJan Kara return 0; 2414884d179dSJan Kara } 2415884d179dSJan Kara 2416287a8095SChristoph Hellwig int dquot_set_dqblk(struct super_block *sb, int type, qid_t id, 2417c472b432SChristoph Hellwig struct fs_disk_quota *di) 2418884d179dSJan Kara { 2419884d179dSJan Kara struct dquot *dquot; 2420884d179dSJan Kara int rc; 2421884d179dSJan Kara 2422884d179dSJan Kara dquot = dqget(sb, id, type); 2423884d179dSJan Kara if (!dquot) { 2424884d179dSJan Kara rc = -ESRCH; 2425884d179dSJan Kara goto out; 2426884d179dSJan Kara } 2427884d179dSJan Kara rc = do_set_dqblk(dquot, di); 2428884d179dSJan Kara dqput(dquot); 2429884d179dSJan Kara out: 2430884d179dSJan Kara return rc; 2431884d179dSJan Kara } 2432287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_set_dqblk); 2433884d179dSJan Kara 2434884d179dSJan Kara /* Generic routine for getting common part of quota file information */ 2435287a8095SChristoph Hellwig int dquot_get_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii) 2436884d179dSJan Kara { 2437884d179dSJan Kara struct mem_dqinfo *mi; 2438884d179dSJan Kara 2439884d179dSJan Kara mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); 2440884d179dSJan Kara if (!sb_has_quota_active(sb, type)) { 2441884d179dSJan Kara mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); 2442884d179dSJan Kara return -ESRCH; 2443884d179dSJan Kara } 2444884d179dSJan Kara mi = sb_dqopt(sb)->info + type; 2445884d179dSJan Kara spin_lock(&dq_data_lock); 2446884d179dSJan Kara ii->dqi_bgrace = mi->dqi_bgrace; 2447884d179dSJan Kara ii->dqi_igrace = mi->dqi_igrace; 2448884d179dSJan Kara ii->dqi_flags = mi->dqi_flags & DQF_MASK; 2449884d179dSJan Kara ii->dqi_valid = IIF_ALL; 2450884d179dSJan Kara spin_unlock(&dq_data_lock); 2451884d179dSJan Kara mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); 2452884d179dSJan Kara return 0; 2453884d179dSJan Kara } 2454287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_get_dqinfo); 2455884d179dSJan Kara 2456884d179dSJan Kara /* Generic routine for setting common part of quota file information */ 2457287a8095SChristoph Hellwig int dquot_set_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii) 2458884d179dSJan Kara { 2459884d179dSJan Kara struct mem_dqinfo *mi; 2460884d179dSJan Kara int err = 0; 2461884d179dSJan Kara 2462884d179dSJan Kara mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); 2463884d179dSJan Kara if (!sb_has_quota_active(sb, type)) { 2464884d179dSJan Kara err = -ESRCH; 2465884d179dSJan Kara goto out; 2466884d179dSJan Kara } 2467884d179dSJan Kara mi = sb_dqopt(sb)->info + type; 2468884d179dSJan Kara spin_lock(&dq_data_lock); 2469884d179dSJan Kara if (ii->dqi_valid & IIF_BGRACE) 2470884d179dSJan Kara mi->dqi_bgrace = ii->dqi_bgrace; 2471884d179dSJan Kara if (ii->dqi_valid & IIF_IGRACE) 2472884d179dSJan Kara mi->dqi_igrace = ii->dqi_igrace; 2473884d179dSJan Kara if (ii->dqi_valid & IIF_FLAGS) 2474268157baSJan Kara mi->dqi_flags = (mi->dqi_flags & ~DQF_MASK) | 2475268157baSJan Kara (ii->dqi_flags & DQF_MASK); 2476884d179dSJan Kara spin_unlock(&dq_data_lock); 2477884d179dSJan Kara mark_info_dirty(sb, type); 2478884d179dSJan Kara /* Force write to disk */ 2479884d179dSJan Kara sb->dq_op->write_info(sb, type); 2480884d179dSJan Kara out: 2481884d179dSJan Kara mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); 2482884d179dSJan Kara return err; 2483884d179dSJan Kara } 2484287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_set_dqinfo); 2485884d179dSJan Kara 2486287a8095SChristoph Hellwig const struct quotactl_ops dquot_quotactl_ops = { 2487287a8095SChristoph Hellwig .quota_on = dquot_quota_on, 2488287a8095SChristoph Hellwig .quota_off = dquot_quota_off, 2489287a8095SChristoph Hellwig .quota_sync = dquot_quota_sync, 2490287a8095SChristoph Hellwig .get_info = dquot_get_dqinfo, 2491287a8095SChristoph Hellwig .set_info = dquot_set_dqinfo, 2492287a8095SChristoph Hellwig .get_dqblk = dquot_get_dqblk, 2493287a8095SChristoph Hellwig .set_dqblk = dquot_set_dqblk 2494884d179dSJan Kara }; 2495287a8095SChristoph Hellwig EXPORT_SYMBOL(dquot_quotactl_ops); 2496dde95888SDmitry Monakhov 2497dde95888SDmitry Monakhov static int do_proc_dqstats(struct ctl_table *table, int write, 2498dde95888SDmitry Monakhov void __user *buffer, size_t *lenp, loff_t *ppos) 2499dde95888SDmitry Monakhov { 2500dde95888SDmitry Monakhov #ifdef CONFIG_SMP 2501dde95888SDmitry Monakhov /* Update global table */ 2502dde95888SDmitry Monakhov unsigned int type = (int *)table->data - dqstats.stat; 2503dde95888SDmitry Monakhov dqstats.stat[type] = dqstats_read(type); 2504dde95888SDmitry Monakhov #endif 2505dde95888SDmitry Monakhov return proc_dointvec(table, write, buffer, lenp, ppos); 2506dde95888SDmitry Monakhov } 2507dde95888SDmitry Monakhov 2508884d179dSJan Kara static ctl_table fs_dqstats_table[] = { 2509884d179dSJan Kara { 2510884d179dSJan Kara .procname = "lookups", 2511dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_LOOKUPS], 2512884d179dSJan Kara .maxlen = sizeof(int), 2513884d179dSJan Kara .mode = 0444, 2514dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2515884d179dSJan Kara }, 2516884d179dSJan Kara { 2517884d179dSJan Kara .procname = "drops", 2518dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_DROPS], 2519884d179dSJan Kara .maxlen = sizeof(int), 2520884d179dSJan Kara .mode = 0444, 2521dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2522884d179dSJan Kara }, 2523884d179dSJan Kara { 2524884d179dSJan Kara .procname = "reads", 2525dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_READS], 2526884d179dSJan Kara .maxlen = sizeof(int), 2527884d179dSJan Kara .mode = 0444, 2528dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2529884d179dSJan Kara }, 2530884d179dSJan Kara { 2531884d179dSJan Kara .procname = "writes", 2532dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_WRITES], 2533884d179dSJan Kara .maxlen = sizeof(int), 2534884d179dSJan Kara .mode = 0444, 2535dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2536884d179dSJan Kara }, 2537884d179dSJan Kara { 2538884d179dSJan Kara .procname = "cache_hits", 2539dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_CACHE_HITS], 2540884d179dSJan Kara .maxlen = sizeof(int), 2541884d179dSJan Kara .mode = 0444, 2542dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2543884d179dSJan Kara }, 2544884d179dSJan Kara { 2545884d179dSJan Kara .procname = "allocated_dquots", 2546dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_ALLOC_DQUOTS], 2547884d179dSJan Kara .maxlen = sizeof(int), 2548884d179dSJan Kara .mode = 0444, 2549dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2550884d179dSJan Kara }, 2551884d179dSJan Kara { 2552884d179dSJan Kara .procname = "free_dquots", 2553dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_FREE_DQUOTS], 2554884d179dSJan Kara .maxlen = sizeof(int), 2555884d179dSJan Kara .mode = 0444, 2556dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2557884d179dSJan Kara }, 2558884d179dSJan Kara { 2559884d179dSJan Kara .procname = "syncs", 2560dde95888SDmitry Monakhov .data = &dqstats.stat[DQST_SYNCS], 2561884d179dSJan Kara .maxlen = sizeof(int), 2562884d179dSJan Kara .mode = 0444, 2563dde95888SDmitry Monakhov .proc_handler = do_proc_dqstats, 2564884d179dSJan Kara }, 2565884d179dSJan Kara #ifdef CONFIG_PRINT_QUOTA_WARNING 2566884d179dSJan Kara { 2567884d179dSJan Kara .procname = "warnings", 2568884d179dSJan Kara .data = &flag_print_warnings, 2569884d179dSJan Kara .maxlen = sizeof(int), 2570884d179dSJan Kara .mode = 0644, 25716d456111SEric W. Biederman .proc_handler = proc_dointvec, 2572884d179dSJan Kara }, 2573884d179dSJan Kara #endif 2574ab09203eSEric W. Biederman { }, 2575884d179dSJan Kara }; 2576884d179dSJan Kara 2577884d179dSJan Kara static ctl_table fs_table[] = { 2578884d179dSJan Kara { 2579884d179dSJan Kara .procname = "quota", 2580884d179dSJan Kara .mode = 0555, 2581884d179dSJan Kara .child = fs_dqstats_table, 2582884d179dSJan Kara }, 2583ab09203eSEric W. Biederman { }, 2584884d179dSJan Kara }; 2585884d179dSJan Kara 2586884d179dSJan Kara static ctl_table sys_table[] = { 2587884d179dSJan Kara { 2588884d179dSJan Kara .procname = "fs", 2589884d179dSJan Kara .mode = 0555, 2590884d179dSJan Kara .child = fs_table, 2591884d179dSJan Kara }, 2592ab09203eSEric W. Biederman { }, 2593884d179dSJan Kara }; 2594884d179dSJan Kara 2595884d179dSJan Kara static int __init dquot_init(void) 2596884d179dSJan Kara { 2597884d179dSJan Kara int i; 2598884d179dSJan Kara unsigned long nr_hash, order; 2599884d179dSJan Kara 2600884d179dSJan Kara printk(KERN_NOTICE "VFS: Disk quotas %s\n", __DQUOT_VERSION__); 2601884d179dSJan Kara 2602884d179dSJan Kara register_sysctl_table(sys_table); 2603884d179dSJan Kara 2604884d179dSJan Kara dquot_cachep = kmem_cache_create("dquot", 2605884d179dSJan Kara sizeof(struct dquot), sizeof(unsigned long) * 4, 2606884d179dSJan Kara (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| 2607884d179dSJan Kara SLAB_MEM_SPREAD|SLAB_PANIC), 2608884d179dSJan Kara NULL); 2609884d179dSJan Kara 2610884d179dSJan Kara order = 0; 2611884d179dSJan Kara dquot_hash = (struct hlist_head *)__get_free_pages(GFP_ATOMIC, order); 2612884d179dSJan Kara if (!dquot_hash) 2613884d179dSJan Kara panic("Cannot create dquot hash table"); 2614884d179dSJan Kara 2615dde95888SDmitry Monakhov #ifdef CONFIG_SMP 2616dde95888SDmitry Monakhov dqstats_pcpu = alloc_percpu(struct dqstats); 2617dde95888SDmitry Monakhov if (!dqstats_pcpu) 2618dde95888SDmitry Monakhov panic("Cannot create dquot stats table"); 2619dde95888SDmitry Monakhov #endif 2620dde95888SDmitry Monakhov memset(&dqstats, 0, sizeof(struct dqstats)); 2621dde95888SDmitry Monakhov 2622884d179dSJan Kara /* Find power-of-two hlist_heads which can fit into allocation */ 2623884d179dSJan Kara nr_hash = (1UL << order) * PAGE_SIZE / sizeof(struct hlist_head); 2624884d179dSJan Kara dq_hash_bits = 0; 2625884d179dSJan Kara do { 2626884d179dSJan Kara dq_hash_bits++; 2627884d179dSJan Kara } while (nr_hash >> dq_hash_bits); 2628884d179dSJan Kara dq_hash_bits--; 2629884d179dSJan Kara 2630884d179dSJan Kara nr_hash = 1UL << dq_hash_bits; 2631884d179dSJan Kara dq_hash_mask = nr_hash - 1; 2632884d179dSJan Kara for (i = 0; i < nr_hash; i++) 2633884d179dSJan Kara INIT_HLIST_HEAD(dquot_hash + i); 2634884d179dSJan Kara 2635884d179dSJan Kara printk("Dquot-cache hash table entries: %ld (order %ld, %ld bytes)\n", 2636884d179dSJan Kara nr_hash, order, (PAGE_SIZE << order)); 2637884d179dSJan Kara 2638884d179dSJan Kara register_shrinker(&dqcache_shrinker); 2639884d179dSJan Kara 2640884d179dSJan Kara return 0; 2641884d179dSJan Kara } 2642884d179dSJan Kara module_init(dquot_init); 2643