1884d179dSJan Kara /* 2884d179dSJan Kara * Implementation of the diskquota system for the LINUX operating system. QUOTA 3884d179dSJan Kara * is implemented using the BSD system call interface as the means of 4884d179dSJan Kara * communication with the user level. This file contains the generic routines 5884d179dSJan Kara * called by the different filesystems on allocation of an inode or block. 6884d179dSJan Kara * These routines take care of the administration needed to have a consistent 7884d179dSJan Kara * diskquota tracking system. The ideas of both user and group quotas are based 8884d179dSJan Kara * on the Melbourne quota system as used on BSD derived systems. The internal 9884d179dSJan Kara * implementation is based on one of the several variants of the LINUX 10884d179dSJan Kara * inode-subsystem with added complexity of the diskquota system. 11884d179dSJan Kara * 12884d179dSJan Kara * Author: Marco van Wieringen <mvw@planets.elm.net> 13884d179dSJan Kara * 14884d179dSJan Kara * Fixes: Dmitry Gorodchanin <pgmdsg@ibi.com>, 11 Feb 96 15884d179dSJan Kara * 16884d179dSJan Kara * Revised list management to avoid races 17884d179dSJan Kara * -- Bill Hawes, <whawes@star.net>, 9/98 18884d179dSJan Kara * 19884d179dSJan Kara * Fixed races in dquot_transfer(), dqget() and dquot_alloc_...(). 20884d179dSJan Kara * As the consequence the locking was moved from dquot_decr_...(), 21884d179dSJan Kara * dquot_incr_...() to calling functions. 22884d179dSJan Kara * invalidate_dquots() now writes modified dquots. 23884d179dSJan Kara * Serialized quota_off() and quota_on() for mount point. 24884d179dSJan Kara * Fixed a few bugs in grow_dquots(). 25884d179dSJan Kara * Fixed deadlock in write_dquot() - we no longer account quotas on 26884d179dSJan Kara * quota files 27884d179dSJan Kara * remove_dquot_ref() moved to inode.c - it now traverses through inodes 28884d179dSJan Kara * add_dquot_ref() restarts after blocking 29884d179dSJan Kara * Added check for bogus uid and fixed check for group in quotactl. 30884d179dSJan Kara * Jan Kara, <jack@suse.cz>, sponsored by SuSE CR, 10-11/99 31884d179dSJan Kara * 32884d179dSJan Kara * Used struct list_head instead of own list struct 33884d179dSJan Kara * Invalidation of referenced dquots is no longer possible 34884d179dSJan Kara * Improved free_dquots list management 35884d179dSJan Kara * Quota and i_blocks are now updated in one place to avoid races 36884d179dSJan Kara * Warnings are now delayed so we won't block in critical section 37884d179dSJan Kara * Write updated not to require dquot lock 38884d179dSJan Kara * Jan Kara, <jack@suse.cz>, 9/2000 39884d179dSJan Kara * 40884d179dSJan Kara * Added dynamic quota structure allocation 41884d179dSJan Kara * Jan Kara <jack@suse.cz> 12/2000 42884d179dSJan Kara * 43884d179dSJan Kara * Rewritten quota interface. Implemented new quota format and 44884d179dSJan Kara * formats registering. 45884d179dSJan Kara * Jan Kara, <jack@suse.cz>, 2001,2002 46884d179dSJan Kara * 47884d179dSJan Kara * New SMP locking. 48884d179dSJan Kara * Jan Kara, <jack@suse.cz>, 10/2002 49884d179dSJan Kara * 50884d179dSJan Kara * Added journalled quota support, fix lock inversion problems 51884d179dSJan Kara * Jan Kara, <jack@suse.cz>, 2003,2004 52884d179dSJan Kara * 53884d179dSJan Kara * (C) Copyright 1994 - 1997 Marco van Wieringen 54884d179dSJan Kara */ 55884d179dSJan Kara 56884d179dSJan Kara #include <linux/errno.h> 57884d179dSJan Kara #include <linux/kernel.h> 58884d179dSJan Kara #include <linux/fs.h> 59884d179dSJan Kara #include <linux/mount.h> 60884d179dSJan Kara #include <linux/mm.h> 61884d179dSJan Kara #include <linux/time.h> 62884d179dSJan Kara #include <linux/types.h> 63884d179dSJan Kara #include <linux/string.h> 64884d179dSJan Kara #include <linux/fcntl.h> 65884d179dSJan Kara #include <linux/stat.h> 66884d179dSJan Kara #include <linux/tty.h> 67884d179dSJan Kara #include <linux/file.h> 68884d179dSJan Kara #include <linux/slab.h> 69884d179dSJan Kara #include <linux/sysctl.h> 70884d179dSJan Kara #include <linux/init.h> 71884d179dSJan Kara #include <linux/module.h> 72884d179dSJan Kara #include <linux/proc_fs.h> 73884d179dSJan Kara #include <linux/security.h> 74884d179dSJan Kara #include <linux/kmod.h> 75884d179dSJan Kara #include <linux/namei.h> 76884d179dSJan Kara #include <linux/buffer_head.h> 77884d179dSJan Kara #include <linux/capability.h> 78884d179dSJan Kara #include <linux/quotaops.h> 79884d179dSJan Kara #include <linux/writeback.h> /* for inode_lock, oddly enough.. */ 80884d179dSJan Kara 81884d179dSJan Kara #include <asm/uaccess.h> 82884d179dSJan Kara 83884d179dSJan Kara #define __DQUOT_PARANOIA 84884d179dSJan Kara 85884d179dSJan Kara /* 86884d179dSJan Kara * There are three quota SMP locks. dq_list_lock protects all lists with quotas 87884d179dSJan Kara * and quota formats, dqstats structure containing statistics about the lists 88884d179dSJan Kara * dq_data_lock protects data from dq_dqb and also mem_dqinfo structures and 89884d179dSJan Kara * also guards consistency of dquot->dq_dqb with inode->i_blocks, i_bytes. 90884d179dSJan Kara * i_blocks and i_bytes updates itself are guarded by i_lock acquired directly 91884d179dSJan Kara * in inode_add_bytes() and inode_sub_bytes(). dq_state_lock protects 92884d179dSJan Kara * modifications of quota state (on quotaon and quotaoff) and readers who care 93884d179dSJan Kara * about latest values take it as well. 94884d179dSJan Kara * 95884d179dSJan Kara * The spinlock ordering is hence: dq_data_lock > dq_list_lock > i_lock, 96884d179dSJan Kara * dq_list_lock > dq_state_lock 97884d179dSJan Kara * 98884d179dSJan Kara * Note that some things (eg. sb pointer, type, id) doesn't change during 99884d179dSJan Kara * the life of the dquot structure and so needn't to be protected by a lock 100884d179dSJan Kara * 101884d179dSJan Kara * Any operation working on dquots via inode pointers must hold dqptr_sem. If 102884d179dSJan Kara * operation is just reading pointers from inode (or not using them at all) the 103884d179dSJan Kara * read lock is enough. If pointers are altered function must hold write lock 104884d179dSJan Kara * (these locking rules also apply for S_NOQUOTA flag in the inode - note that 105884d179dSJan Kara * for altering the flag i_mutex is also needed). 106884d179dSJan Kara * 107884d179dSJan Kara * Each dquot has its dq_lock mutex. Locked dquots might not be referenced 108884d179dSJan Kara * from inodes (dquot_alloc_space() and such don't check the dq_lock). 109884d179dSJan Kara * Currently dquot is locked only when it is being read to memory (or space for 110884d179dSJan Kara * it is being allocated) on the first dqget() and when it is being released on 111884d179dSJan Kara * the last dqput(). The allocation and release oparations are serialized by 112884d179dSJan Kara * the dq_lock and by checking the use count in dquot_release(). Write 113884d179dSJan Kara * operations on dquots don't hold dq_lock as they copy data under dq_data_lock 114884d179dSJan Kara * spinlock to internal buffers before writing. 115884d179dSJan Kara * 116884d179dSJan Kara * Lock ordering (including related VFS locks) is the following: 117884d179dSJan Kara * i_mutex > dqonoff_sem > journal_lock > dqptr_sem > dquot->dq_lock > 118884d179dSJan Kara * dqio_mutex 119884d179dSJan Kara * The lock ordering of dqptr_sem imposed by quota code is only dqonoff_sem > 120884d179dSJan Kara * dqptr_sem. But filesystem has to count with the fact that functions such as 121884d179dSJan Kara * dquot_alloc_space() acquire dqptr_sem and they usually have to be called 122884d179dSJan Kara * from inside a transaction to keep filesystem consistency after a crash. Also 123884d179dSJan Kara * filesystems usually want to do some IO on dquot from ->mark_dirty which is 124884d179dSJan Kara * called with dqptr_sem held. 125884d179dSJan Kara * i_mutex on quota files is special (it's below dqio_mutex) 126884d179dSJan Kara */ 127884d179dSJan Kara 128c516610cSJan Kara static __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_list_lock); 129c516610cSJan Kara static __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_state_lock); 130c516610cSJan Kara __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_data_lock); 131884d179dSJan Kara EXPORT_SYMBOL(dq_data_lock); 132884d179dSJan Kara 133884d179dSJan Kara static char *quotatypes[] = INITQFNAMES; 134884d179dSJan Kara static struct quota_format_type *quota_formats; /* List of registered formats */ 135884d179dSJan Kara static struct quota_module_name module_names[] = INIT_QUOTA_MODULE_NAMES; 136884d179dSJan Kara 137884d179dSJan Kara /* SLAB cache for dquot structures */ 138884d179dSJan Kara static struct kmem_cache *dquot_cachep; 139884d179dSJan Kara 140884d179dSJan Kara int register_quota_format(struct quota_format_type *fmt) 141884d179dSJan Kara { 142884d179dSJan Kara spin_lock(&dq_list_lock); 143884d179dSJan Kara fmt->qf_next = quota_formats; 144884d179dSJan Kara quota_formats = fmt; 145884d179dSJan Kara spin_unlock(&dq_list_lock); 146884d179dSJan Kara return 0; 147884d179dSJan Kara } 148884d179dSJan Kara EXPORT_SYMBOL(register_quota_format); 149884d179dSJan Kara 150884d179dSJan Kara void unregister_quota_format(struct quota_format_type *fmt) 151884d179dSJan Kara { 152884d179dSJan Kara struct quota_format_type **actqf; 153884d179dSJan Kara 154884d179dSJan Kara spin_lock(&dq_list_lock); 155268157baSJan Kara for (actqf = "a_formats; *actqf && *actqf != fmt; 156268157baSJan Kara actqf = &(*actqf)->qf_next) 157268157baSJan Kara ; 158884d179dSJan Kara if (*actqf) 159884d179dSJan Kara *actqf = (*actqf)->qf_next; 160884d179dSJan Kara spin_unlock(&dq_list_lock); 161884d179dSJan Kara } 162884d179dSJan Kara EXPORT_SYMBOL(unregister_quota_format); 163884d179dSJan Kara 164884d179dSJan Kara static struct quota_format_type *find_quota_format(int id) 165884d179dSJan Kara { 166884d179dSJan Kara struct quota_format_type *actqf; 167884d179dSJan Kara 168884d179dSJan Kara spin_lock(&dq_list_lock); 169268157baSJan Kara for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id; 170268157baSJan Kara actqf = actqf->qf_next) 171268157baSJan Kara ; 172884d179dSJan Kara if (!actqf || !try_module_get(actqf->qf_owner)) { 173884d179dSJan Kara int qm; 174884d179dSJan Kara 175884d179dSJan Kara spin_unlock(&dq_list_lock); 176884d179dSJan Kara 177268157baSJan Kara for (qm = 0; module_names[qm].qm_fmt_id && 178268157baSJan Kara module_names[qm].qm_fmt_id != id; qm++) 179268157baSJan Kara ; 180268157baSJan Kara if (!module_names[qm].qm_fmt_id || 181268157baSJan Kara request_module(module_names[qm].qm_mod_name)) 182884d179dSJan Kara return NULL; 183884d179dSJan Kara 184884d179dSJan Kara spin_lock(&dq_list_lock); 185268157baSJan Kara for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id; 186268157baSJan Kara actqf = actqf->qf_next) 187268157baSJan Kara ; 188884d179dSJan Kara if (actqf && !try_module_get(actqf->qf_owner)) 189884d179dSJan Kara actqf = NULL; 190884d179dSJan Kara } 191884d179dSJan Kara spin_unlock(&dq_list_lock); 192884d179dSJan Kara return actqf; 193884d179dSJan Kara } 194884d179dSJan Kara 195884d179dSJan Kara static void put_quota_format(struct quota_format_type *fmt) 196884d179dSJan Kara { 197884d179dSJan Kara module_put(fmt->qf_owner); 198884d179dSJan Kara } 199884d179dSJan Kara 200884d179dSJan Kara /* 201884d179dSJan Kara * Dquot List Management: 202884d179dSJan Kara * The quota code uses three lists for dquot management: the inuse_list, 203884d179dSJan Kara * free_dquots, and dquot_hash[] array. A single dquot structure may be 204884d179dSJan Kara * on all three lists, depending on its current state. 205884d179dSJan Kara * 206884d179dSJan Kara * All dquots are placed to the end of inuse_list when first created, and this 207884d179dSJan Kara * list is used for invalidate operation, which must look at every dquot. 208884d179dSJan Kara * 209884d179dSJan Kara * Unused dquots (dq_count == 0) are added to the free_dquots list when freed, 210884d179dSJan Kara * and this list is searched whenever we need an available dquot. Dquots are 211884d179dSJan Kara * removed from the list as soon as they are used again, and 212884d179dSJan Kara * dqstats.free_dquots gives the number of dquots on the list. When 213884d179dSJan Kara * dquot is invalidated it's completely released from memory. 214884d179dSJan Kara * 215884d179dSJan Kara * Dquots with a specific identity (device, type and id) are placed on 216884d179dSJan Kara * one of the dquot_hash[] hash chains. The provides an efficient search 217884d179dSJan Kara * mechanism to locate a specific dquot. 218884d179dSJan Kara */ 219884d179dSJan Kara 220884d179dSJan Kara static LIST_HEAD(inuse_list); 221884d179dSJan Kara static LIST_HEAD(free_dquots); 222884d179dSJan Kara static unsigned int dq_hash_bits, dq_hash_mask; 223884d179dSJan Kara static struct hlist_head *dquot_hash; 224884d179dSJan Kara 225884d179dSJan Kara struct dqstats dqstats; 226884d179dSJan Kara EXPORT_SYMBOL(dqstats); 227884d179dSJan Kara 228884d179dSJan Kara static inline unsigned int 229884d179dSJan Kara hashfn(const struct super_block *sb, unsigned int id, int type) 230884d179dSJan Kara { 231884d179dSJan Kara unsigned long tmp; 232884d179dSJan Kara 233884d179dSJan Kara tmp = (((unsigned long)sb>>L1_CACHE_SHIFT) ^ id) * (MAXQUOTAS - type); 234884d179dSJan Kara return (tmp + (tmp >> dq_hash_bits)) & dq_hash_mask; 235884d179dSJan Kara } 236884d179dSJan Kara 237884d179dSJan Kara /* 238884d179dSJan Kara * Following list functions expect dq_list_lock to be held 239884d179dSJan Kara */ 240884d179dSJan Kara static inline void insert_dquot_hash(struct dquot *dquot) 241884d179dSJan Kara { 242268157baSJan Kara struct hlist_head *head; 243268157baSJan Kara head = dquot_hash + hashfn(dquot->dq_sb, dquot->dq_id, dquot->dq_type); 244884d179dSJan Kara hlist_add_head(&dquot->dq_hash, head); 245884d179dSJan Kara } 246884d179dSJan Kara 247884d179dSJan Kara static inline void remove_dquot_hash(struct dquot *dquot) 248884d179dSJan Kara { 249884d179dSJan Kara hlist_del_init(&dquot->dq_hash); 250884d179dSJan Kara } 251884d179dSJan Kara 2527a2435d8SJan Kara static struct dquot *find_dquot(unsigned int hashent, struct super_block *sb, 2537a2435d8SJan Kara unsigned int id, int type) 254884d179dSJan Kara { 255884d179dSJan Kara struct hlist_node *node; 256884d179dSJan Kara struct dquot *dquot; 257884d179dSJan Kara 258884d179dSJan Kara hlist_for_each (node, dquot_hash+hashent) { 259884d179dSJan Kara dquot = hlist_entry(node, struct dquot, dq_hash); 260268157baSJan Kara if (dquot->dq_sb == sb && dquot->dq_id == id && 261268157baSJan Kara dquot->dq_type == type) 262884d179dSJan Kara return dquot; 263884d179dSJan Kara } 264dd6f3c6dSJan Kara return NULL; 265884d179dSJan Kara } 266884d179dSJan Kara 267884d179dSJan Kara /* Add a dquot to the tail of the free list */ 268884d179dSJan Kara static inline void put_dquot_last(struct dquot *dquot) 269884d179dSJan Kara { 270884d179dSJan Kara list_add_tail(&dquot->dq_free, &free_dquots); 271884d179dSJan Kara dqstats.free_dquots++; 272884d179dSJan Kara } 273884d179dSJan Kara 274884d179dSJan Kara static inline void remove_free_dquot(struct dquot *dquot) 275884d179dSJan Kara { 276884d179dSJan Kara if (list_empty(&dquot->dq_free)) 277884d179dSJan Kara return; 278884d179dSJan Kara list_del_init(&dquot->dq_free); 279884d179dSJan Kara dqstats.free_dquots--; 280884d179dSJan Kara } 281884d179dSJan Kara 282884d179dSJan Kara static inline void put_inuse(struct dquot *dquot) 283884d179dSJan Kara { 284884d179dSJan Kara /* We add to the back of inuse list so we don't have to restart 285884d179dSJan Kara * when traversing this list and we block */ 286884d179dSJan Kara list_add_tail(&dquot->dq_inuse, &inuse_list); 287884d179dSJan Kara dqstats.allocated_dquots++; 288884d179dSJan Kara } 289884d179dSJan Kara 290884d179dSJan Kara static inline void remove_inuse(struct dquot *dquot) 291884d179dSJan Kara { 292884d179dSJan Kara dqstats.allocated_dquots--; 293884d179dSJan Kara list_del(&dquot->dq_inuse); 294884d179dSJan Kara } 295884d179dSJan Kara /* 296884d179dSJan Kara * End of list functions needing dq_list_lock 297884d179dSJan Kara */ 298884d179dSJan Kara 299884d179dSJan Kara static void wait_on_dquot(struct dquot *dquot) 300884d179dSJan Kara { 301884d179dSJan Kara mutex_lock(&dquot->dq_lock); 302884d179dSJan Kara mutex_unlock(&dquot->dq_lock); 303884d179dSJan Kara } 304884d179dSJan Kara 305884d179dSJan Kara static inline int dquot_dirty(struct dquot *dquot) 306884d179dSJan Kara { 307884d179dSJan Kara return test_bit(DQ_MOD_B, &dquot->dq_flags); 308884d179dSJan Kara } 309884d179dSJan Kara 310884d179dSJan Kara static inline int mark_dquot_dirty(struct dquot *dquot) 311884d179dSJan Kara { 312884d179dSJan Kara return dquot->dq_sb->dq_op->mark_dirty(dquot); 313884d179dSJan Kara } 314884d179dSJan Kara 315884d179dSJan Kara int dquot_mark_dquot_dirty(struct dquot *dquot) 316884d179dSJan Kara { 317884d179dSJan Kara spin_lock(&dq_list_lock); 318884d179dSJan Kara if (!test_and_set_bit(DQ_MOD_B, &dquot->dq_flags)) 319884d179dSJan Kara list_add(&dquot->dq_dirty, &sb_dqopt(dquot->dq_sb)-> 320884d179dSJan Kara info[dquot->dq_type].dqi_dirty_list); 321884d179dSJan Kara spin_unlock(&dq_list_lock); 322884d179dSJan Kara return 0; 323884d179dSJan Kara } 324884d179dSJan Kara EXPORT_SYMBOL(dquot_mark_dquot_dirty); 325884d179dSJan Kara 326dc52dd3aSDmitry Monakhov /* Dirtify all the dquots - this can block when journalling */ 327dc52dd3aSDmitry Monakhov static inline int mark_all_dquot_dirty(struct dquot * const *dquot) 328dc52dd3aSDmitry Monakhov { 329dc52dd3aSDmitry Monakhov int ret, err, cnt; 330dc52dd3aSDmitry Monakhov 331dc52dd3aSDmitry Monakhov ret = err = 0; 332dc52dd3aSDmitry Monakhov for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 333dc52dd3aSDmitry Monakhov if (dquot[cnt]) 334dc52dd3aSDmitry Monakhov /* Even in case of error we have to continue */ 335dc52dd3aSDmitry Monakhov ret = mark_dquot_dirty(dquot[cnt]); 336dc52dd3aSDmitry Monakhov if (!err) 337dc52dd3aSDmitry Monakhov err = ret; 338dc52dd3aSDmitry Monakhov } 339dc52dd3aSDmitry Monakhov return err; 340dc52dd3aSDmitry Monakhov } 341dc52dd3aSDmitry Monakhov 342dc52dd3aSDmitry Monakhov static inline void dqput_all(struct dquot **dquot) 343dc52dd3aSDmitry Monakhov { 344dc52dd3aSDmitry Monakhov unsigned int cnt; 345dc52dd3aSDmitry Monakhov 346dc52dd3aSDmitry Monakhov for (cnt = 0; cnt < MAXQUOTAS; cnt++) 347dc52dd3aSDmitry Monakhov dqput(dquot[cnt]); 348dc52dd3aSDmitry Monakhov } 349dc52dd3aSDmitry Monakhov 350884d179dSJan Kara /* This function needs dq_list_lock */ 351884d179dSJan Kara static inline int clear_dquot_dirty(struct dquot *dquot) 352884d179dSJan Kara { 353884d179dSJan Kara if (!test_and_clear_bit(DQ_MOD_B, &dquot->dq_flags)) 354884d179dSJan Kara return 0; 355884d179dSJan Kara list_del_init(&dquot->dq_dirty); 356884d179dSJan Kara return 1; 357884d179dSJan Kara } 358884d179dSJan Kara 359884d179dSJan Kara void mark_info_dirty(struct super_block *sb, int type) 360884d179dSJan Kara { 361884d179dSJan Kara set_bit(DQF_INFO_DIRTY_B, &sb_dqopt(sb)->info[type].dqi_flags); 362884d179dSJan Kara } 363884d179dSJan Kara EXPORT_SYMBOL(mark_info_dirty); 364884d179dSJan Kara 365884d179dSJan Kara /* 366884d179dSJan Kara * Read dquot from disk and alloc space for it 367884d179dSJan Kara */ 368884d179dSJan Kara 369884d179dSJan Kara int dquot_acquire(struct dquot *dquot) 370884d179dSJan Kara { 371884d179dSJan Kara int ret = 0, ret2 = 0; 372884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); 373884d179dSJan Kara 374884d179dSJan Kara mutex_lock(&dquot->dq_lock); 375884d179dSJan Kara mutex_lock(&dqopt->dqio_mutex); 376884d179dSJan Kara if (!test_bit(DQ_READ_B, &dquot->dq_flags)) 377884d179dSJan Kara ret = dqopt->ops[dquot->dq_type]->read_dqblk(dquot); 378884d179dSJan Kara if (ret < 0) 379884d179dSJan Kara goto out_iolock; 380884d179dSJan Kara set_bit(DQ_READ_B, &dquot->dq_flags); 381884d179dSJan Kara /* Instantiate dquot if needed */ 382884d179dSJan Kara if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && !dquot->dq_off) { 383884d179dSJan Kara ret = dqopt->ops[dquot->dq_type]->commit_dqblk(dquot); 384884d179dSJan Kara /* Write the info if needed */ 385268157baSJan Kara if (info_dirty(&dqopt->info[dquot->dq_type])) { 386268157baSJan Kara ret2 = dqopt->ops[dquot->dq_type]->write_file_info( 387268157baSJan Kara dquot->dq_sb, dquot->dq_type); 388268157baSJan Kara } 389884d179dSJan Kara if (ret < 0) 390884d179dSJan Kara goto out_iolock; 391884d179dSJan Kara if (ret2 < 0) { 392884d179dSJan Kara ret = ret2; 393884d179dSJan Kara goto out_iolock; 394884d179dSJan Kara } 395884d179dSJan Kara } 396884d179dSJan Kara set_bit(DQ_ACTIVE_B, &dquot->dq_flags); 397884d179dSJan Kara out_iolock: 398884d179dSJan Kara mutex_unlock(&dqopt->dqio_mutex); 399884d179dSJan Kara mutex_unlock(&dquot->dq_lock); 400884d179dSJan Kara return ret; 401884d179dSJan Kara } 402884d179dSJan Kara EXPORT_SYMBOL(dquot_acquire); 403884d179dSJan Kara 404884d179dSJan Kara /* 405884d179dSJan Kara * Write dquot to disk 406884d179dSJan Kara */ 407884d179dSJan Kara int dquot_commit(struct dquot *dquot) 408884d179dSJan Kara { 409884d179dSJan Kara int ret = 0, ret2 = 0; 410884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); 411884d179dSJan Kara 412884d179dSJan Kara mutex_lock(&dqopt->dqio_mutex); 413884d179dSJan Kara spin_lock(&dq_list_lock); 414884d179dSJan Kara if (!clear_dquot_dirty(dquot)) { 415884d179dSJan Kara spin_unlock(&dq_list_lock); 416884d179dSJan Kara goto out_sem; 417884d179dSJan Kara } 418884d179dSJan Kara spin_unlock(&dq_list_lock); 419884d179dSJan Kara /* Inactive dquot can be only if there was error during read/init 420884d179dSJan Kara * => we have better not writing it */ 421884d179dSJan Kara if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { 422884d179dSJan Kara ret = dqopt->ops[dquot->dq_type]->commit_dqblk(dquot); 423268157baSJan Kara if (info_dirty(&dqopt->info[dquot->dq_type])) { 424268157baSJan Kara ret2 = dqopt->ops[dquot->dq_type]->write_file_info( 425268157baSJan Kara dquot->dq_sb, dquot->dq_type); 426268157baSJan Kara } 427884d179dSJan Kara if (ret >= 0) 428884d179dSJan Kara ret = ret2; 429884d179dSJan Kara } 430884d179dSJan Kara out_sem: 431884d179dSJan Kara mutex_unlock(&dqopt->dqio_mutex); 432884d179dSJan Kara return ret; 433884d179dSJan Kara } 434884d179dSJan Kara EXPORT_SYMBOL(dquot_commit); 435884d179dSJan Kara 436884d179dSJan Kara /* 437884d179dSJan Kara * Release dquot 438884d179dSJan Kara */ 439884d179dSJan Kara int dquot_release(struct dquot *dquot) 440884d179dSJan Kara { 441884d179dSJan Kara int ret = 0, ret2 = 0; 442884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); 443884d179dSJan Kara 444884d179dSJan Kara mutex_lock(&dquot->dq_lock); 445884d179dSJan Kara /* Check whether we are not racing with some other dqget() */ 446884d179dSJan Kara if (atomic_read(&dquot->dq_count) > 1) 447884d179dSJan Kara goto out_dqlock; 448884d179dSJan Kara mutex_lock(&dqopt->dqio_mutex); 449884d179dSJan Kara if (dqopt->ops[dquot->dq_type]->release_dqblk) { 450884d179dSJan Kara ret = dqopt->ops[dquot->dq_type]->release_dqblk(dquot); 451884d179dSJan Kara /* Write the info */ 452268157baSJan Kara if (info_dirty(&dqopt->info[dquot->dq_type])) { 453268157baSJan Kara ret2 = dqopt->ops[dquot->dq_type]->write_file_info( 454268157baSJan Kara dquot->dq_sb, dquot->dq_type); 455268157baSJan Kara } 456884d179dSJan Kara if (ret >= 0) 457884d179dSJan Kara ret = ret2; 458884d179dSJan Kara } 459884d179dSJan Kara clear_bit(DQ_ACTIVE_B, &dquot->dq_flags); 460884d179dSJan Kara mutex_unlock(&dqopt->dqio_mutex); 461884d179dSJan Kara out_dqlock: 462884d179dSJan Kara mutex_unlock(&dquot->dq_lock); 463884d179dSJan Kara return ret; 464884d179dSJan Kara } 465884d179dSJan Kara EXPORT_SYMBOL(dquot_release); 466884d179dSJan Kara 467884d179dSJan Kara void dquot_destroy(struct dquot *dquot) 468884d179dSJan Kara { 469884d179dSJan Kara kmem_cache_free(dquot_cachep, dquot); 470884d179dSJan Kara } 471884d179dSJan Kara EXPORT_SYMBOL(dquot_destroy); 472884d179dSJan Kara 473884d179dSJan Kara static inline void do_destroy_dquot(struct dquot *dquot) 474884d179dSJan Kara { 475884d179dSJan Kara dquot->dq_sb->dq_op->destroy_dquot(dquot); 476884d179dSJan Kara } 477884d179dSJan Kara 478884d179dSJan Kara /* Invalidate all dquots on the list. Note that this function is called after 479884d179dSJan Kara * quota is disabled and pointers from inodes removed so there cannot be new 480884d179dSJan Kara * quota users. There can still be some users of quotas due to inodes being 481884d179dSJan Kara * just deleted or pruned by prune_icache() (those are not attached to any 482884d179dSJan Kara * list) or parallel quotactl call. We have to wait for such users. 483884d179dSJan Kara */ 484884d179dSJan Kara static void invalidate_dquots(struct super_block *sb, int type) 485884d179dSJan Kara { 486884d179dSJan Kara struct dquot *dquot, *tmp; 487884d179dSJan Kara 488884d179dSJan Kara restart: 489884d179dSJan Kara spin_lock(&dq_list_lock); 490884d179dSJan Kara list_for_each_entry_safe(dquot, tmp, &inuse_list, dq_inuse) { 491884d179dSJan Kara if (dquot->dq_sb != sb) 492884d179dSJan Kara continue; 493884d179dSJan Kara if (dquot->dq_type != type) 494884d179dSJan Kara continue; 495884d179dSJan Kara /* Wait for dquot users */ 496884d179dSJan Kara if (atomic_read(&dquot->dq_count)) { 497884d179dSJan Kara DEFINE_WAIT(wait); 498884d179dSJan Kara 499884d179dSJan Kara atomic_inc(&dquot->dq_count); 500884d179dSJan Kara prepare_to_wait(&dquot->dq_wait_unused, &wait, 501884d179dSJan Kara TASK_UNINTERRUPTIBLE); 502884d179dSJan Kara spin_unlock(&dq_list_lock); 503884d179dSJan Kara /* Once dqput() wakes us up, we know it's time to free 504884d179dSJan Kara * the dquot. 505884d179dSJan Kara * IMPORTANT: we rely on the fact that there is always 506884d179dSJan Kara * at most one process waiting for dquot to free. 507884d179dSJan Kara * Otherwise dq_count would be > 1 and we would never 508884d179dSJan Kara * wake up. 509884d179dSJan Kara */ 510884d179dSJan Kara if (atomic_read(&dquot->dq_count) > 1) 511884d179dSJan Kara schedule(); 512884d179dSJan Kara finish_wait(&dquot->dq_wait_unused, &wait); 513884d179dSJan Kara dqput(dquot); 514884d179dSJan Kara /* At this moment dquot() need not exist (it could be 515884d179dSJan Kara * reclaimed by prune_dqcache(). Hence we must 516884d179dSJan Kara * restart. */ 517884d179dSJan Kara goto restart; 518884d179dSJan Kara } 519884d179dSJan Kara /* 520884d179dSJan Kara * Quota now has no users and it has been written on last 521884d179dSJan Kara * dqput() 522884d179dSJan Kara */ 523884d179dSJan Kara remove_dquot_hash(dquot); 524884d179dSJan Kara remove_free_dquot(dquot); 525884d179dSJan Kara remove_inuse(dquot); 526884d179dSJan Kara do_destroy_dquot(dquot); 527884d179dSJan Kara } 528884d179dSJan Kara spin_unlock(&dq_list_lock); 529884d179dSJan Kara } 530884d179dSJan Kara 531884d179dSJan Kara /* Call callback for every active dquot on given filesystem */ 532884d179dSJan Kara int dquot_scan_active(struct super_block *sb, 533884d179dSJan Kara int (*fn)(struct dquot *dquot, unsigned long priv), 534884d179dSJan Kara unsigned long priv) 535884d179dSJan Kara { 536884d179dSJan Kara struct dquot *dquot, *old_dquot = NULL; 537884d179dSJan Kara int ret = 0; 538884d179dSJan Kara 539884d179dSJan Kara mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); 540884d179dSJan Kara spin_lock(&dq_list_lock); 541884d179dSJan Kara list_for_each_entry(dquot, &inuse_list, dq_inuse) { 542884d179dSJan Kara if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) 543884d179dSJan Kara continue; 544884d179dSJan Kara if (dquot->dq_sb != sb) 545884d179dSJan Kara continue; 546884d179dSJan Kara /* Now we have active dquot so we can just increase use count */ 547884d179dSJan Kara atomic_inc(&dquot->dq_count); 548884d179dSJan Kara dqstats.lookups++; 549884d179dSJan Kara spin_unlock(&dq_list_lock); 550884d179dSJan Kara dqput(old_dquot); 551884d179dSJan Kara old_dquot = dquot; 552884d179dSJan Kara ret = fn(dquot, priv); 553884d179dSJan Kara if (ret < 0) 554884d179dSJan Kara goto out; 555884d179dSJan Kara spin_lock(&dq_list_lock); 556884d179dSJan Kara /* We are safe to continue now because our dquot could not 557884d179dSJan Kara * be moved out of the inuse list while we hold the reference */ 558884d179dSJan Kara } 559884d179dSJan Kara spin_unlock(&dq_list_lock); 560884d179dSJan Kara out: 561884d179dSJan Kara dqput(old_dquot); 562884d179dSJan Kara mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); 563884d179dSJan Kara return ret; 564884d179dSJan Kara } 565884d179dSJan Kara EXPORT_SYMBOL(dquot_scan_active); 566884d179dSJan Kara 567884d179dSJan Kara int vfs_quota_sync(struct super_block *sb, int type) 568884d179dSJan Kara { 569884d179dSJan Kara struct list_head *dirty; 570884d179dSJan Kara struct dquot *dquot; 571884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 572884d179dSJan Kara int cnt; 573884d179dSJan Kara 574884d179dSJan Kara mutex_lock(&dqopt->dqonoff_mutex); 575884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 576884d179dSJan Kara if (type != -1 && cnt != type) 577884d179dSJan Kara continue; 578884d179dSJan Kara if (!sb_has_quota_active(sb, cnt)) 579884d179dSJan Kara continue; 580884d179dSJan Kara spin_lock(&dq_list_lock); 581884d179dSJan Kara dirty = &dqopt->info[cnt].dqi_dirty_list; 582884d179dSJan Kara while (!list_empty(dirty)) { 583268157baSJan Kara dquot = list_first_entry(dirty, struct dquot, 584268157baSJan Kara dq_dirty); 585884d179dSJan Kara /* Dirty and inactive can be only bad dquot... */ 586884d179dSJan Kara if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { 587884d179dSJan Kara clear_dquot_dirty(dquot); 588884d179dSJan Kara continue; 589884d179dSJan Kara } 590884d179dSJan Kara /* Now we have active dquot from which someone is 591884d179dSJan Kara * holding reference so we can safely just increase 592884d179dSJan Kara * use count */ 593884d179dSJan Kara atomic_inc(&dquot->dq_count); 594884d179dSJan Kara dqstats.lookups++; 595884d179dSJan Kara spin_unlock(&dq_list_lock); 596884d179dSJan Kara sb->dq_op->write_dquot(dquot); 597884d179dSJan Kara dqput(dquot); 598884d179dSJan Kara spin_lock(&dq_list_lock); 599884d179dSJan Kara } 600884d179dSJan Kara spin_unlock(&dq_list_lock); 601884d179dSJan Kara } 602884d179dSJan Kara 603884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 604884d179dSJan Kara if ((cnt == type || type == -1) && sb_has_quota_active(sb, cnt) 605884d179dSJan Kara && info_dirty(&dqopt->info[cnt])) 606884d179dSJan Kara sb->dq_op->write_info(sb, cnt); 607884d179dSJan Kara spin_lock(&dq_list_lock); 608884d179dSJan Kara dqstats.syncs++; 609884d179dSJan Kara spin_unlock(&dq_list_lock); 610884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 611884d179dSJan Kara 612884d179dSJan Kara return 0; 613884d179dSJan Kara } 614884d179dSJan Kara EXPORT_SYMBOL(vfs_quota_sync); 615884d179dSJan Kara 616884d179dSJan Kara /* Free unused dquots from cache */ 617884d179dSJan Kara static void prune_dqcache(int count) 618884d179dSJan Kara { 619884d179dSJan Kara struct list_head *head; 620884d179dSJan Kara struct dquot *dquot; 621884d179dSJan Kara 622884d179dSJan Kara head = free_dquots.prev; 623884d179dSJan Kara while (head != &free_dquots && count) { 624884d179dSJan Kara dquot = list_entry(head, struct dquot, dq_free); 625884d179dSJan Kara remove_dquot_hash(dquot); 626884d179dSJan Kara remove_free_dquot(dquot); 627884d179dSJan Kara remove_inuse(dquot); 628884d179dSJan Kara do_destroy_dquot(dquot); 629884d179dSJan Kara count--; 630884d179dSJan Kara head = free_dquots.prev; 631884d179dSJan Kara } 632884d179dSJan Kara } 633884d179dSJan Kara 634884d179dSJan Kara /* 635884d179dSJan Kara * This is called from kswapd when we think we need some 636884d179dSJan Kara * more memory 637884d179dSJan Kara */ 638884d179dSJan Kara 639884d179dSJan Kara static int shrink_dqcache_memory(int nr, gfp_t gfp_mask) 640884d179dSJan Kara { 641884d179dSJan Kara if (nr) { 642884d179dSJan Kara spin_lock(&dq_list_lock); 643884d179dSJan Kara prune_dqcache(nr); 644884d179dSJan Kara spin_unlock(&dq_list_lock); 645884d179dSJan Kara } 646884d179dSJan Kara return (dqstats.free_dquots / 100) * sysctl_vfs_cache_pressure; 647884d179dSJan Kara } 648884d179dSJan Kara 649884d179dSJan Kara static struct shrinker dqcache_shrinker = { 650884d179dSJan Kara .shrink = shrink_dqcache_memory, 651884d179dSJan Kara .seeks = DEFAULT_SEEKS, 652884d179dSJan Kara }; 653884d179dSJan Kara 654884d179dSJan Kara /* 655884d179dSJan Kara * Put reference to dquot 656884d179dSJan Kara * NOTE: If you change this function please check whether dqput_blocks() works right... 657884d179dSJan Kara */ 658884d179dSJan Kara void dqput(struct dquot *dquot) 659884d179dSJan Kara { 660884d179dSJan Kara int ret; 661884d179dSJan Kara 662884d179dSJan Kara if (!dquot) 663884d179dSJan Kara return; 664884d179dSJan Kara #ifdef __DQUOT_PARANOIA 665884d179dSJan Kara if (!atomic_read(&dquot->dq_count)) { 666884d179dSJan Kara printk("VFS: dqput: trying to free free dquot\n"); 667884d179dSJan Kara printk("VFS: device %s, dquot of %s %d\n", 668884d179dSJan Kara dquot->dq_sb->s_id, 669884d179dSJan Kara quotatypes[dquot->dq_type], 670884d179dSJan Kara dquot->dq_id); 671884d179dSJan Kara BUG(); 672884d179dSJan Kara } 673884d179dSJan Kara #endif 674884d179dSJan Kara 675884d179dSJan Kara spin_lock(&dq_list_lock); 676884d179dSJan Kara dqstats.drops++; 677884d179dSJan Kara spin_unlock(&dq_list_lock); 678884d179dSJan Kara we_slept: 679884d179dSJan Kara spin_lock(&dq_list_lock); 680884d179dSJan Kara if (atomic_read(&dquot->dq_count) > 1) { 681884d179dSJan Kara /* We have more than one user... nothing to do */ 682884d179dSJan Kara atomic_dec(&dquot->dq_count); 683884d179dSJan Kara /* Releasing dquot during quotaoff phase? */ 684884d179dSJan Kara if (!sb_has_quota_active(dquot->dq_sb, dquot->dq_type) && 685884d179dSJan Kara atomic_read(&dquot->dq_count) == 1) 686884d179dSJan Kara wake_up(&dquot->dq_wait_unused); 687884d179dSJan Kara spin_unlock(&dq_list_lock); 688884d179dSJan Kara return; 689884d179dSJan Kara } 690884d179dSJan Kara /* Need to release dquot? */ 691884d179dSJan Kara if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && dquot_dirty(dquot)) { 692884d179dSJan Kara spin_unlock(&dq_list_lock); 693884d179dSJan Kara /* Commit dquot before releasing */ 694884d179dSJan Kara ret = dquot->dq_sb->dq_op->write_dquot(dquot); 695884d179dSJan Kara if (ret < 0) { 696884d179dSJan Kara printk(KERN_ERR "VFS: cannot write quota structure on " 697884d179dSJan Kara "device %s (error %d). Quota may get out of " 698884d179dSJan Kara "sync!\n", dquot->dq_sb->s_id, ret); 699884d179dSJan Kara /* 700884d179dSJan Kara * We clear dirty bit anyway, so that we avoid 701884d179dSJan Kara * infinite loop here 702884d179dSJan Kara */ 703884d179dSJan Kara spin_lock(&dq_list_lock); 704884d179dSJan Kara clear_dquot_dirty(dquot); 705884d179dSJan Kara spin_unlock(&dq_list_lock); 706884d179dSJan Kara } 707884d179dSJan Kara goto we_slept; 708884d179dSJan Kara } 709884d179dSJan Kara /* Clear flag in case dquot was inactive (something bad happened) */ 710884d179dSJan Kara clear_dquot_dirty(dquot); 711884d179dSJan Kara if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { 712884d179dSJan Kara spin_unlock(&dq_list_lock); 713884d179dSJan Kara dquot->dq_sb->dq_op->release_dquot(dquot); 714884d179dSJan Kara goto we_slept; 715884d179dSJan Kara } 716884d179dSJan Kara atomic_dec(&dquot->dq_count); 717884d179dSJan Kara #ifdef __DQUOT_PARANOIA 718884d179dSJan Kara /* sanity check */ 719884d179dSJan Kara BUG_ON(!list_empty(&dquot->dq_free)); 720884d179dSJan Kara #endif 721884d179dSJan Kara put_dquot_last(dquot); 722884d179dSJan Kara spin_unlock(&dq_list_lock); 723884d179dSJan Kara } 724884d179dSJan Kara EXPORT_SYMBOL(dqput); 725884d179dSJan Kara 726884d179dSJan Kara struct dquot *dquot_alloc(struct super_block *sb, int type) 727884d179dSJan Kara { 728884d179dSJan Kara return kmem_cache_zalloc(dquot_cachep, GFP_NOFS); 729884d179dSJan Kara } 730884d179dSJan Kara EXPORT_SYMBOL(dquot_alloc); 731884d179dSJan Kara 732884d179dSJan Kara static struct dquot *get_empty_dquot(struct super_block *sb, int type) 733884d179dSJan Kara { 734884d179dSJan Kara struct dquot *dquot; 735884d179dSJan Kara 736884d179dSJan Kara dquot = sb->dq_op->alloc_dquot(sb, type); 737884d179dSJan Kara if(!dquot) 738dd6f3c6dSJan Kara return NULL; 739884d179dSJan Kara 740884d179dSJan Kara mutex_init(&dquot->dq_lock); 741884d179dSJan Kara INIT_LIST_HEAD(&dquot->dq_free); 742884d179dSJan Kara INIT_LIST_HEAD(&dquot->dq_inuse); 743884d179dSJan Kara INIT_HLIST_NODE(&dquot->dq_hash); 744884d179dSJan Kara INIT_LIST_HEAD(&dquot->dq_dirty); 745884d179dSJan Kara init_waitqueue_head(&dquot->dq_wait_unused); 746884d179dSJan Kara dquot->dq_sb = sb; 747884d179dSJan Kara dquot->dq_type = type; 748884d179dSJan Kara atomic_set(&dquot->dq_count, 1); 749884d179dSJan Kara 750884d179dSJan Kara return dquot; 751884d179dSJan Kara } 752884d179dSJan Kara 753884d179dSJan Kara /* 754884d179dSJan Kara * Get reference to dquot 755884d179dSJan Kara * 756884d179dSJan Kara * Locking is slightly tricky here. We are guarded from parallel quotaoff() 757884d179dSJan Kara * destroying our dquot by: 758884d179dSJan Kara * a) checking for quota flags under dq_list_lock and 759884d179dSJan Kara * b) getting a reference to dquot before we release dq_list_lock 760884d179dSJan Kara */ 761884d179dSJan Kara struct dquot *dqget(struct super_block *sb, unsigned int id, int type) 762884d179dSJan Kara { 763884d179dSJan Kara unsigned int hashent = hashfn(sb, id, type); 764dd6f3c6dSJan Kara struct dquot *dquot = NULL, *empty = NULL; 765884d179dSJan Kara 766884d179dSJan Kara if (!sb_has_quota_active(sb, type)) 767dd6f3c6dSJan Kara return NULL; 768884d179dSJan Kara we_slept: 769884d179dSJan Kara spin_lock(&dq_list_lock); 770884d179dSJan Kara spin_lock(&dq_state_lock); 771884d179dSJan Kara if (!sb_has_quota_active(sb, type)) { 772884d179dSJan Kara spin_unlock(&dq_state_lock); 773884d179dSJan Kara spin_unlock(&dq_list_lock); 774884d179dSJan Kara goto out; 775884d179dSJan Kara } 776884d179dSJan Kara spin_unlock(&dq_state_lock); 777884d179dSJan Kara 778dd6f3c6dSJan Kara dquot = find_dquot(hashent, sb, id, type); 779dd6f3c6dSJan Kara if (!dquot) { 780dd6f3c6dSJan Kara if (!empty) { 781884d179dSJan Kara spin_unlock(&dq_list_lock); 782dd6f3c6dSJan Kara empty = get_empty_dquot(sb, type); 783dd6f3c6dSJan Kara if (!empty) 784884d179dSJan Kara schedule(); /* Try to wait for a moment... */ 785884d179dSJan Kara goto we_slept; 786884d179dSJan Kara } 787884d179dSJan Kara dquot = empty; 788dd6f3c6dSJan Kara empty = NULL; 789884d179dSJan Kara dquot->dq_id = id; 790884d179dSJan Kara /* all dquots go on the inuse_list */ 791884d179dSJan Kara put_inuse(dquot); 792884d179dSJan Kara /* hash it first so it can be found */ 793884d179dSJan Kara insert_dquot_hash(dquot); 794884d179dSJan Kara dqstats.lookups++; 795884d179dSJan Kara spin_unlock(&dq_list_lock); 796884d179dSJan Kara } else { 797884d179dSJan Kara if (!atomic_read(&dquot->dq_count)) 798884d179dSJan Kara remove_free_dquot(dquot); 799884d179dSJan Kara atomic_inc(&dquot->dq_count); 800884d179dSJan Kara dqstats.cache_hits++; 801884d179dSJan Kara dqstats.lookups++; 802884d179dSJan Kara spin_unlock(&dq_list_lock); 803884d179dSJan Kara } 804268157baSJan Kara /* Wait for dq_lock - after this we know that either dquot_release() is 805268157baSJan Kara * already finished or it will be canceled due to dq_count > 1 test */ 806884d179dSJan Kara wait_on_dquot(dquot); 807268157baSJan Kara /* Read the dquot / allocate space in quota file */ 808268157baSJan Kara if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && 809268157baSJan Kara sb->dq_op->acquire_dquot(dquot) < 0) { 810884d179dSJan Kara dqput(dquot); 811dd6f3c6dSJan Kara dquot = NULL; 812884d179dSJan Kara goto out; 813884d179dSJan Kara } 814884d179dSJan Kara #ifdef __DQUOT_PARANOIA 815884d179dSJan Kara BUG_ON(!dquot->dq_sb); /* Has somebody invalidated entry under us? */ 816884d179dSJan Kara #endif 817884d179dSJan Kara out: 818884d179dSJan Kara if (empty) 819884d179dSJan Kara do_destroy_dquot(empty); 820884d179dSJan Kara 821884d179dSJan Kara return dquot; 822884d179dSJan Kara } 823884d179dSJan Kara EXPORT_SYMBOL(dqget); 824884d179dSJan Kara 825884d179dSJan Kara static int dqinit_needed(struct inode *inode, int type) 826884d179dSJan Kara { 827884d179dSJan Kara int cnt; 828884d179dSJan Kara 829884d179dSJan Kara if (IS_NOQUOTA(inode)) 830884d179dSJan Kara return 0; 831884d179dSJan Kara if (type != -1) 832dd6f3c6dSJan Kara return !inode->i_dquot[type]; 833884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 834dd6f3c6dSJan Kara if (!inode->i_dquot[cnt]) 835884d179dSJan Kara return 1; 836884d179dSJan Kara return 0; 837884d179dSJan Kara } 838884d179dSJan Kara 839884d179dSJan Kara /* This routine is guarded by dqonoff_mutex mutex */ 840884d179dSJan Kara static void add_dquot_ref(struct super_block *sb, int type) 841884d179dSJan Kara { 842884d179dSJan Kara struct inode *inode, *old_inode = NULL; 843884d179dSJan Kara 844884d179dSJan Kara spin_lock(&inode_lock); 845884d179dSJan Kara list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { 846b6fac63cSWu Fengguang if (inode->i_state & (I_FREEING|I_CLEAR|I_WILL_FREE|I_NEW)) 8473ae5080fSLinus Torvalds continue; 848884d179dSJan Kara if (!atomic_read(&inode->i_writecount)) 849884d179dSJan Kara continue; 850884d179dSJan Kara if (!dqinit_needed(inode, type)) 851884d179dSJan Kara continue; 852884d179dSJan Kara 853884d179dSJan Kara __iget(inode); 854884d179dSJan Kara spin_unlock(&inode_lock); 855884d179dSJan Kara 856884d179dSJan Kara iput(old_inode); 857884d179dSJan Kara sb->dq_op->initialize(inode, type); 858884d179dSJan Kara /* We hold a reference to 'inode' so it couldn't have been 859884d179dSJan Kara * removed from s_inodes list while we dropped the inode_lock. 860884d179dSJan Kara * We cannot iput the inode now as we can be holding the last 861884d179dSJan Kara * reference and we cannot iput it under inode_lock. So we 862884d179dSJan Kara * keep the reference and iput it later. */ 863884d179dSJan Kara old_inode = inode; 864884d179dSJan Kara spin_lock(&inode_lock); 865884d179dSJan Kara } 866884d179dSJan Kara spin_unlock(&inode_lock); 867884d179dSJan Kara iput(old_inode); 868884d179dSJan Kara } 869884d179dSJan Kara 870268157baSJan Kara /* 871268157baSJan Kara * Return 0 if dqput() won't block. 872268157baSJan Kara * (note that 1 doesn't necessarily mean blocking) 873268157baSJan Kara */ 874884d179dSJan Kara static inline int dqput_blocks(struct dquot *dquot) 875884d179dSJan Kara { 876884d179dSJan Kara if (atomic_read(&dquot->dq_count) <= 1) 877884d179dSJan Kara return 1; 878884d179dSJan Kara return 0; 879884d179dSJan Kara } 880884d179dSJan Kara 881268157baSJan Kara /* 882268157baSJan Kara * Remove references to dquots from inode and add dquot to list for freeing 883268157baSJan Kara * if we have the last referece to dquot 884268157baSJan Kara * We can't race with anybody because we hold dqptr_sem for writing... 885268157baSJan Kara */ 886884d179dSJan Kara static int remove_inode_dquot_ref(struct inode *inode, int type, 887884d179dSJan Kara struct list_head *tofree_head) 888884d179dSJan Kara { 889884d179dSJan Kara struct dquot *dquot = inode->i_dquot[type]; 890884d179dSJan Kara 891dd6f3c6dSJan Kara inode->i_dquot[type] = NULL; 892dd6f3c6dSJan Kara if (dquot) { 893884d179dSJan Kara if (dqput_blocks(dquot)) { 894884d179dSJan Kara #ifdef __DQUOT_PARANOIA 895884d179dSJan Kara if (atomic_read(&dquot->dq_count) != 1) 896884d179dSJan Kara printk(KERN_WARNING "VFS: Adding dquot with dq_count %d to dispose list.\n", atomic_read(&dquot->dq_count)); 897884d179dSJan Kara #endif 898884d179dSJan Kara spin_lock(&dq_list_lock); 899268157baSJan Kara /* As dquot must have currently users it can't be on 900268157baSJan Kara * the free list... */ 901268157baSJan Kara list_add(&dquot->dq_free, tofree_head); 902884d179dSJan Kara spin_unlock(&dq_list_lock); 903884d179dSJan Kara return 1; 904884d179dSJan Kara } 905884d179dSJan Kara else 906884d179dSJan Kara dqput(dquot); /* We have guaranteed we won't block */ 907884d179dSJan Kara } 908884d179dSJan Kara return 0; 909884d179dSJan Kara } 910884d179dSJan Kara 911268157baSJan Kara /* 912268157baSJan Kara * Free list of dquots 913268157baSJan Kara * Dquots are removed from inodes and no new references can be got so we are 914268157baSJan Kara * the only ones holding reference 915268157baSJan Kara */ 916884d179dSJan Kara static void put_dquot_list(struct list_head *tofree_head) 917884d179dSJan Kara { 918884d179dSJan Kara struct list_head *act_head; 919884d179dSJan Kara struct dquot *dquot; 920884d179dSJan Kara 921884d179dSJan Kara act_head = tofree_head->next; 922884d179dSJan Kara while (act_head != tofree_head) { 923884d179dSJan Kara dquot = list_entry(act_head, struct dquot, dq_free); 924884d179dSJan Kara act_head = act_head->next; 925268157baSJan Kara /* Remove dquot from the list so we won't have problems... */ 926268157baSJan Kara list_del_init(&dquot->dq_free); 927884d179dSJan Kara dqput(dquot); 928884d179dSJan Kara } 929884d179dSJan Kara } 930884d179dSJan Kara 931884d179dSJan Kara static void remove_dquot_ref(struct super_block *sb, int type, 932884d179dSJan Kara struct list_head *tofree_head) 933884d179dSJan Kara { 934884d179dSJan Kara struct inode *inode; 935884d179dSJan Kara 936884d179dSJan Kara spin_lock(&inode_lock); 937884d179dSJan Kara list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { 9383ae5080fSLinus Torvalds /* 9393ae5080fSLinus Torvalds * We have to scan also I_NEW inodes because they can already 9403ae5080fSLinus Torvalds * have quota pointer initialized. Luckily, we need to touch 9413ae5080fSLinus Torvalds * only quota pointers and these have separate locking 9423ae5080fSLinus Torvalds * (dqptr_sem). 9433ae5080fSLinus Torvalds */ 944884d179dSJan Kara if (!IS_NOQUOTA(inode)) 945884d179dSJan Kara remove_inode_dquot_ref(inode, type, tofree_head); 946884d179dSJan Kara } 947884d179dSJan Kara spin_unlock(&inode_lock); 948884d179dSJan Kara } 949884d179dSJan Kara 950884d179dSJan Kara /* Gather all references from inodes and drop them */ 951884d179dSJan Kara static void drop_dquot_ref(struct super_block *sb, int type) 952884d179dSJan Kara { 953884d179dSJan Kara LIST_HEAD(tofree_head); 954884d179dSJan Kara 955884d179dSJan Kara if (sb->dq_op) { 956884d179dSJan Kara down_write(&sb_dqopt(sb)->dqptr_sem); 957884d179dSJan Kara remove_dquot_ref(sb, type, &tofree_head); 958884d179dSJan Kara up_write(&sb_dqopt(sb)->dqptr_sem); 959884d179dSJan Kara put_dquot_list(&tofree_head); 960884d179dSJan Kara } 961884d179dSJan Kara } 962884d179dSJan Kara 963884d179dSJan Kara static inline void dquot_incr_inodes(struct dquot *dquot, qsize_t number) 964884d179dSJan Kara { 965884d179dSJan Kara dquot->dq_dqb.dqb_curinodes += number; 966884d179dSJan Kara } 967884d179dSJan Kara 968884d179dSJan Kara static inline void dquot_incr_space(struct dquot *dquot, qsize_t number) 969884d179dSJan Kara { 970884d179dSJan Kara dquot->dq_dqb.dqb_curspace += number; 971884d179dSJan Kara } 972884d179dSJan Kara 973884d179dSJan Kara static inline void dquot_resv_space(struct dquot *dquot, qsize_t number) 974884d179dSJan Kara { 975884d179dSJan Kara dquot->dq_dqb.dqb_rsvspace += number; 976884d179dSJan Kara } 977884d179dSJan Kara 978884d179dSJan Kara /* 979884d179dSJan Kara * Claim reserved quota space 980884d179dSJan Kara */ 981884d179dSJan Kara static void dquot_claim_reserved_space(struct dquot *dquot, 982884d179dSJan Kara qsize_t number) 983884d179dSJan Kara { 984884d179dSJan Kara WARN_ON(dquot->dq_dqb.dqb_rsvspace < number); 985884d179dSJan Kara dquot->dq_dqb.dqb_curspace += number; 986884d179dSJan Kara dquot->dq_dqb.dqb_rsvspace -= number; 987884d179dSJan Kara } 988884d179dSJan Kara 989884d179dSJan Kara static inline 990884d179dSJan Kara void dquot_free_reserved_space(struct dquot *dquot, qsize_t number) 991884d179dSJan Kara { 992884d179dSJan Kara dquot->dq_dqb.dqb_rsvspace -= number; 993884d179dSJan Kara } 994884d179dSJan Kara 9957a2435d8SJan Kara static void dquot_decr_inodes(struct dquot *dquot, qsize_t number) 996884d179dSJan Kara { 997884d179dSJan Kara if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE || 998884d179dSJan Kara dquot->dq_dqb.dqb_curinodes >= number) 999884d179dSJan Kara dquot->dq_dqb.dqb_curinodes -= number; 1000884d179dSJan Kara else 1001884d179dSJan Kara dquot->dq_dqb.dqb_curinodes = 0; 1002884d179dSJan Kara if (dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit) 1003884d179dSJan Kara dquot->dq_dqb.dqb_itime = (time_t) 0; 1004884d179dSJan Kara clear_bit(DQ_INODES_B, &dquot->dq_flags); 1005884d179dSJan Kara } 1006884d179dSJan Kara 10077a2435d8SJan Kara static void dquot_decr_space(struct dquot *dquot, qsize_t number) 1008884d179dSJan Kara { 1009884d179dSJan Kara if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE || 1010884d179dSJan Kara dquot->dq_dqb.dqb_curspace >= number) 1011884d179dSJan Kara dquot->dq_dqb.dqb_curspace -= number; 1012884d179dSJan Kara else 1013884d179dSJan Kara dquot->dq_dqb.dqb_curspace = 0; 1014884d179dSJan Kara if (dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit) 1015884d179dSJan Kara dquot->dq_dqb.dqb_btime = (time_t) 0; 1016884d179dSJan Kara clear_bit(DQ_BLKS_B, &dquot->dq_flags); 1017884d179dSJan Kara } 1018884d179dSJan Kara 1019884d179dSJan Kara static int warning_issued(struct dquot *dquot, const int warntype) 1020884d179dSJan Kara { 1021884d179dSJan Kara int flag = (warntype == QUOTA_NL_BHARDWARN || 1022884d179dSJan Kara warntype == QUOTA_NL_BSOFTLONGWARN) ? DQ_BLKS_B : 1023884d179dSJan Kara ((warntype == QUOTA_NL_IHARDWARN || 1024884d179dSJan Kara warntype == QUOTA_NL_ISOFTLONGWARN) ? DQ_INODES_B : 0); 1025884d179dSJan Kara 1026884d179dSJan Kara if (!flag) 1027884d179dSJan Kara return 0; 1028884d179dSJan Kara return test_and_set_bit(flag, &dquot->dq_flags); 1029884d179dSJan Kara } 1030884d179dSJan Kara 1031884d179dSJan Kara #ifdef CONFIG_PRINT_QUOTA_WARNING 1032884d179dSJan Kara static int flag_print_warnings = 1; 1033884d179dSJan Kara 10347a2435d8SJan Kara static int need_print_warning(struct dquot *dquot) 1035884d179dSJan Kara { 1036884d179dSJan Kara if (!flag_print_warnings) 1037884d179dSJan Kara return 0; 1038884d179dSJan Kara 1039884d179dSJan Kara switch (dquot->dq_type) { 1040884d179dSJan Kara case USRQUOTA: 1041884d179dSJan Kara return current_fsuid() == dquot->dq_id; 1042884d179dSJan Kara case GRPQUOTA: 1043884d179dSJan Kara return in_group_p(dquot->dq_id); 1044884d179dSJan Kara } 1045884d179dSJan Kara return 0; 1046884d179dSJan Kara } 1047884d179dSJan Kara 1048884d179dSJan Kara /* Print warning to user which exceeded quota */ 1049884d179dSJan Kara static void print_warning(struct dquot *dquot, const int warntype) 1050884d179dSJan Kara { 1051884d179dSJan Kara char *msg = NULL; 1052884d179dSJan Kara struct tty_struct *tty; 1053884d179dSJan Kara 1054884d179dSJan Kara if (warntype == QUOTA_NL_IHARDBELOW || 1055884d179dSJan Kara warntype == QUOTA_NL_ISOFTBELOW || 1056884d179dSJan Kara warntype == QUOTA_NL_BHARDBELOW || 1057884d179dSJan Kara warntype == QUOTA_NL_BSOFTBELOW || !need_print_warning(dquot)) 1058884d179dSJan Kara return; 1059884d179dSJan Kara 1060884d179dSJan Kara tty = get_current_tty(); 1061884d179dSJan Kara if (!tty) 1062884d179dSJan Kara return; 1063884d179dSJan Kara tty_write_message(tty, dquot->dq_sb->s_id); 1064884d179dSJan Kara if (warntype == QUOTA_NL_ISOFTWARN || warntype == QUOTA_NL_BSOFTWARN) 1065884d179dSJan Kara tty_write_message(tty, ": warning, "); 1066884d179dSJan Kara else 1067884d179dSJan Kara tty_write_message(tty, ": write failed, "); 1068884d179dSJan Kara tty_write_message(tty, quotatypes[dquot->dq_type]); 1069884d179dSJan Kara switch (warntype) { 1070884d179dSJan Kara case QUOTA_NL_IHARDWARN: 1071884d179dSJan Kara msg = " file limit reached.\r\n"; 1072884d179dSJan Kara break; 1073884d179dSJan Kara case QUOTA_NL_ISOFTLONGWARN: 1074884d179dSJan Kara msg = " file quota exceeded too long.\r\n"; 1075884d179dSJan Kara break; 1076884d179dSJan Kara case QUOTA_NL_ISOFTWARN: 1077884d179dSJan Kara msg = " file quota exceeded.\r\n"; 1078884d179dSJan Kara break; 1079884d179dSJan Kara case QUOTA_NL_BHARDWARN: 1080884d179dSJan Kara msg = " block limit reached.\r\n"; 1081884d179dSJan Kara break; 1082884d179dSJan Kara case QUOTA_NL_BSOFTLONGWARN: 1083884d179dSJan Kara msg = " block quota exceeded too long.\r\n"; 1084884d179dSJan Kara break; 1085884d179dSJan Kara case QUOTA_NL_BSOFTWARN: 1086884d179dSJan Kara msg = " block quota exceeded.\r\n"; 1087884d179dSJan Kara break; 1088884d179dSJan Kara } 1089884d179dSJan Kara tty_write_message(tty, msg); 1090884d179dSJan Kara tty_kref_put(tty); 1091884d179dSJan Kara } 1092884d179dSJan Kara #endif 1093884d179dSJan Kara 1094884d179dSJan Kara /* 1095884d179dSJan Kara * Write warnings to the console and send warning messages over netlink. 1096884d179dSJan Kara * 1097884d179dSJan Kara * Note that this function can sleep. 1098884d179dSJan Kara */ 10997a2435d8SJan Kara static void flush_warnings(struct dquot *const *dquots, char *warntype) 1100884d179dSJan Kara { 110186e931a3SSteven Whitehouse struct dquot *dq; 1102884d179dSJan Kara int i; 1103884d179dSJan Kara 110486e931a3SSteven Whitehouse for (i = 0; i < MAXQUOTAS; i++) { 110586e931a3SSteven Whitehouse dq = dquots[i]; 110686e931a3SSteven Whitehouse if (dq && warntype[i] != QUOTA_NL_NOWARN && 110786e931a3SSteven Whitehouse !warning_issued(dq, warntype[i])) { 1108884d179dSJan Kara #ifdef CONFIG_PRINT_QUOTA_WARNING 110986e931a3SSteven Whitehouse print_warning(dq, warntype[i]); 1110884d179dSJan Kara #endif 111186e931a3SSteven Whitehouse quota_send_warning(dq->dq_type, dq->dq_id, 111286e931a3SSteven Whitehouse dq->dq_sb->s_dev, warntype[i]); 111386e931a3SSteven Whitehouse } 1114884d179dSJan Kara } 1115884d179dSJan Kara } 1116884d179dSJan Kara 11177a2435d8SJan Kara static int ignore_hardlimit(struct dquot *dquot) 1118884d179dSJan Kara { 1119884d179dSJan Kara struct mem_dqinfo *info = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_type]; 1120884d179dSJan Kara 1121884d179dSJan Kara return capable(CAP_SYS_RESOURCE) && 1122268157baSJan Kara (info->dqi_format->qf_fmt_id != QFMT_VFS_OLD || 1123268157baSJan Kara !(info->dqi_flags & V1_DQF_RSQUASH)); 1124884d179dSJan Kara } 1125884d179dSJan Kara 1126884d179dSJan Kara /* needs dq_data_lock */ 1127884d179dSJan Kara static int check_idq(struct dquot *dquot, qsize_t inodes, char *warntype) 1128884d179dSJan Kara { 1129268157baSJan Kara qsize_t newinodes = dquot->dq_dqb.dqb_curinodes + inodes; 1130268157baSJan Kara 1131884d179dSJan Kara *warntype = QUOTA_NL_NOWARN; 1132884d179dSJan Kara if (!sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_type) || 1133884d179dSJan Kara test_bit(DQ_FAKE_B, &dquot->dq_flags)) 1134884d179dSJan Kara return QUOTA_OK; 1135884d179dSJan Kara 1136884d179dSJan Kara if (dquot->dq_dqb.dqb_ihardlimit && 1137268157baSJan Kara newinodes > dquot->dq_dqb.dqb_ihardlimit && 1138884d179dSJan Kara !ignore_hardlimit(dquot)) { 1139884d179dSJan Kara *warntype = QUOTA_NL_IHARDWARN; 1140884d179dSJan Kara return NO_QUOTA; 1141884d179dSJan Kara } 1142884d179dSJan Kara 1143884d179dSJan Kara if (dquot->dq_dqb.dqb_isoftlimit && 1144268157baSJan Kara newinodes > dquot->dq_dqb.dqb_isoftlimit && 1145268157baSJan Kara dquot->dq_dqb.dqb_itime && 1146268157baSJan Kara get_seconds() >= dquot->dq_dqb.dqb_itime && 1147884d179dSJan Kara !ignore_hardlimit(dquot)) { 1148884d179dSJan Kara *warntype = QUOTA_NL_ISOFTLONGWARN; 1149884d179dSJan Kara return NO_QUOTA; 1150884d179dSJan Kara } 1151884d179dSJan Kara 1152884d179dSJan Kara if (dquot->dq_dqb.dqb_isoftlimit && 1153268157baSJan Kara newinodes > dquot->dq_dqb.dqb_isoftlimit && 1154884d179dSJan Kara dquot->dq_dqb.dqb_itime == 0) { 1155884d179dSJan Kara *warntype = QUOTA_NL_ISOFTWARN; 1156268157baSJan Kara dquot->dq_dqb.dqb_itime = get_seconds() + 1157268157baSJan Kara sb_dqopt(dquot->dq_sb)->info[dquot->dq_type].dqi_igrace; 1158884d179dSJan Kara } 1159884d179dSJan Kara 1160884d179dSJan Kara return QUOTA_OK; 1161884d179dSJan Kara } 1162884d179dSJan Kara 1163884d179dSJan Kara /* needs dq_data_lock */ 1164884d179dSJan Kara static int check_bdq(struct dquot *dquot, qsize_t space, int prealloc, char *warntype) 1165884d179dSJan Kara { 1166884d179dSJan Kara qsize_t tspace; 1167268157baSJan Kara struct super_block *sb = dquot->dq_sb; 1168884d179dSJan Kara 1169884d179dSJan Kara *warntype = QUOTA_NL_NOWARN; 1170268157baSJan Kara if (!sb_has_quota_limits_enabled(sb, dquot->dq_type) || 1171884d179dSJan Kara test_bit(DQ_FAKE_B, &dquot->dq_flags)) 1172884d179dSJan Kara return QUOTA_OK; 1173884d179dSJan Kara 1174884d179dSJan Kara tspace = dquot->dq_dqb.dqb_curspace + dquot->dq_dqb.dqb_rsvspace 1175884d179dSJan Kara + space; 1176884d179dSJan Kara 1177884d179dSJan Kara if (dquot->dq_dqb.dqb_bhardlimit && 1178884d179dSJan Kara tspace > dquot->dq_dqb.dqb_bhardlimit && 1179884d179dSJan Kara !ignore_hardlimit(dquot)) { 1180884d179dSJan Kara if (!prealloc) 1181884d179dSJan Kara *warntype = QUOTA_NL_BHARDWARN; 1182884d179dSJan Kara return NO_QUOTA; 1183884d179dSJan Kara } 1184884d179dSJan Kara 1185884d179dSJan Kara if (dquot->dq_dqb.dqb_bsoftlimit && 1186884d179dSJan Kara tspace > dquot->dq_dqb.dqb_bsoftlimit && 1187268157baSJan Kara dquot->dq_dqb.dqb_btime && 1188268157baSJan Kara get_seconds() >= dquot->dq_dqb.dqb_btime && 1189884d179dSJan Kara !ignore_hardlimit(dquot)) { 1190884d179dSJan Kara if (!prealloc) 1191884d179dSJan Kara *warntype = QUOTA_NL_BSOFTLONGWARN; 1192884d179dSJan Kara return NO_QUOTA; 1193884d179dSJan Kara } 1194884d179dSJan Kara 1195884d179dSJan Kara if (dquot->dq_dqb.dqb_bsoftlimit && 1196884d179dSJan Kara tspace > dquot->dq_dqb.dqb_bsoftlimit && 1197884d179dSJan Kara dquot->dq_dqb.dqb_btime == 0) { 1198884d179dSJan Kara if (!prealloc) { 1199884d179dSJan Kara *warntype = QUOTA_NL_BSOFTWARN; 1200268157baSJan Kara dquot->dq_dqb.dqb_btime = get_seconds() + 1201268157baSJan Kara sb_dqopt(sb)->info[dquot->dq_type].dqi_bgrace; 1202884d179dSJan Kara } 1203884d179dSJan Kara else 1204884d179dSJan Kara /* 1205884d179dSJan Kara * We don't allow preallocation to exceed softlimit so exceeding will 1206884d179dSJan Kara * be always printed 1207884d179dSJan Kara */ 1208884d179dSJan Kara return NO_QUOTA; 1209884d179dSJan Kara } 1210884d179dSJan Kara 1211884d179dSJan Kara return QUOTA_OK; 1212884d179dSJan Kara } 1213884d179dSJan Kara 1214884d179dSJan Kara static int info_idq_free(struct dquot *dquot, qsize_t inodes) 1215884d179dSJan Kara { 1216268157baSJan Kara qsize_t newinodes; 1217268157baSJan Kara 1218884d179dSJan Kara if (test_bit(DQ_FAKE_B, &dquot->dq_flags) || 1219884d179dSJan Kara dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit || 1220884d179dSJan Kara !sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_type)) 1221884d179dSJan Kara return QUOTA_NL_NOWARN; 1222884d179dSJan Kara 1223268157baSJan Kara newinodes = dquot->dq_dqb.dqb_curinodes - inodes; 1224268157baSJan Kara if (newinodes <= dquot->dq_dqb.dqb_isoftlimit) 1225884d179dSJan Kara return QUOTA_NL_ISOFTBELOW; 1226884d179dSJan Kara if (dquot->dq_dqb.dqb_curinodes >= dquot->dq_dqb.dqb_ihardlimit && 1227268157baSJan Kara newinodes < dquot->dq_dqb.dqb_ihardlimit) 1228884d179dSJan Kara return QUOTA_NL_IHARDBELOW; 1229884d179dSJan Kara return QUOTA_NL_NOWARN; 1230884d179dSJan Kara } 1231884d179dSJan Kara 1232884d179dSJan Kara static int info_bdq_free(struct dquot *dquot, qsize_t space) 1233884d179dSJan Kara { 1234884d179dSJan Kara if (test_bit(DQ_FAKE_B, &dquot->dq_flags) || 1235884d179dSJan Kara dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit) 1236884d179dSJan Kara return QUOTA_NL_NOWARN; 1237884d179dSJan Kara 1238884d179dSJan Kara if (dquot->dq_dqb.dqb_curspace - space <= dquot->dq_dqb.dqb_bsoftlimit) 1239884d179dSJan Kara return QUOTA_NL_BSOFTBELOW; 1240884d179dSJan Kara if (dquot->dq_dqb.dqb_curspace >= dquot->dq_dqb.dqb_bhardlimit && 1241884d179dSJan Kara dquot->dq_dqb.dqb_curspace - space < dquot->dq_dqb.dqb_bhardlimit) 1242884d179dSJan Kara return QUOTA_NL_BHARDBELOW; 1243884d179dSJan Kara return QUOTA_NL_NOWARN; 1244884d179dSJan Kara } 1245884d179dSJan Kara /* 1246884d179dSJan Kara * Initialize quota pointers in inode 1247884d179dSJan Kara * We do things in a bit complicated way but by that we avoid calling 1248884d179dSJan Kara * dqget() and thus filesystem callbacks under dqptr_sem. 1249884d179dSJan Kara */ 1250884d179dSJan Kara int dquot_initialize(struct inode *inode, int type) 1251884d179dSJan Kara { 1252884d179dSJan Kara unsigned int id = 0; 1253884d179dSJan Kara int cnt, ret = 0; 1254dd6f3c6dSJan Kara struct dquot *got[MAXQUOTAS] = { NULL, NULL }; 1255884d179dSJan Kara struct super_block *sb = inode->i_sb; 1256884d179dSJan Kara 1257884d179dSJan Kara /* First test before acquiring mutex - solves deadlocks when we 1258884d179dSJan Kara * re-enter the quota code and are already holding the mutex */ 1259884d179dSJan Kara if (IS_NOQUOTA(inode)) 1260884d179dSJan Kara return 0; 1261884d179dSJan Kara 1262884d179dSJan Kara /* First get references to structures we might need. */ 1263884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1264884d179dSJan Kara if (type != -1 && cnt != type) 1265884d179dSJan Kara continue; 1266884d179dSJan Kara switch (cnt) { 1267884d179dSJan Kara case USRQUOTA: 1268884d179dSJan Kara id = inode->i_uid; 1269884d179dSJan Kara break; 1270884d179dSJan Kara case GRPQUOTA: 1271884d179dSJan Kara id = inode->i_gid; 1272884d179dSJan Kara break; 1273884d179dSJan Kara } 1274884d179dSJan Kara got[cnt] = dqget(sb, id, cnt); 1275884d179dSJan Kara } 1276884d179dSJan Kara 1277884d179dSJan Kara down_write(&sb_dqopt(sb)->dqptr_sem); 1278884d179dSJan Kara /* Having dqptr_sem we know NOQUOTA flags can't be altered... */ 1279884d179dSJan Kara if (IS_NOQUOTA(inode)) 1280884d179dSJan Kara goto out_err; 1281884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1282884d179dSJan Kara if (type != -1 && cnt != type) 1283884d179dSJan Kara continue; 1284884d179dSJan Kara /* Avoid races with quotaoff() */ 1285884d179dSJan Kara if (!sb_has_quota_active(sb, cnt)) 1286884d179dSJan Kara continue; 1287dd6f3c6dSJan Kara if (!inode->i_dquot[cnt]) { 1288884d179dSJan Kara inode->i_dquot[cnt] = got[cnt]; 1289dd6f3c6dSJan Kara got[cnt] = NULL; 1290884d179dSJan Kara } 1291884d179dSJan Kara } 1292884d179dSJan Kara out_err: 1293884d179dSJan Kara up_write(&sb_dqopt(sb)->dqptr_sem); 1294884d179dSJan Kara /* Drop unused references */ 1295dc52dd3aSDmitry Monakhov dqput_all(got); 1296884d179dSJan Kara return ret; 1297884d179dSJan Kara } 1298884d179dSJan Kara EXPORT_SYMBOL(dquot_initialize); 1299884d179dSJan Kara 1300884d179dSJan Kara /* 1301884d179dSJan Kara * Release all quotas referenced by inode 1302884d179dSJan Kara */ 1303884d179dSJan Kara int dquot_drop(struct inode *inode) 1304884d179dSJan Kara { 1305884d179dSJan Kara int cnt; 1306884d179dSJan Kara struct dquot *put[MAXQUOTAS]; 1307884d179dSJan Kara 1308884d179dSJan Kara down_write(&sb_dqopt(inode->i_sb)->dqptr_sem); 1309884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1310884d179dSJan Kara put[cnt] = inode->i_dquot[cnt]; 1311dd6f3c6dSJan Kara inode->i_dquot[cnt] = NULL; 1312884d179dSJan Kara } 1313884d179dSJan Kara up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); 1314dc52dd3aSDmitry Monakhov dqput_all(put); 1315884d179dSJan Kara return 0; 1316884d179dSJan Kara } 1317884d179dSJan Kara EXPORT_SYMBOL(dquot_drop); 1318884d179dSJan Kara 1319884d179dSJan Kara /* Wrapper to remove references to quota structures from inode */ 1320884d179dSJan Kara void vfs_dq_drop(struct inode *inode) 1321884d179dSJan Kara { 1322884d179dSJan Kara /* Here we can get arbitrary inode from clear_inode() so we have 1323884d179dSJan Kara * to be careful. OTOH we don't need locking as quota operations 1324884d179dSJan Kara * are allowed to change only at mount time */ 1325884d179dSJan Kara if (!IS_NOQUOTA(inode) && inode->i_sb && inode->i_sb->dq_op 1326884d179dSJan Kara && inode->i_sb->dq_op->drop) { 1327884d179dSJan Kara int cnt; 1328884d179dSJan Kara /* Test before calling to rule out calls from proc and such 1329884d179dSJan Kara * where we are not allowed to block. Note that this is 1330884d179dSJan Kara * actually reliable test even without the lock - the caller 1331884d179dSJan Kara * must assure that nobody can come after the DQUOT_DROP and 1332884d179dSJan Kara * add quota pointers back anyway */ 1333884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 1334dd6f3c6dSJan Kara if (inode->i_dquot[cnt]) 1335884d179dSJan Kara break; 1336884d179dSJan Kara if (cnt < MAXQUOTAS) 1337884d179dSJan Kara inode->i_sb->dq_op->drop(inode); 1338884d179dSJan Kara } 1339884d179dSJan Kara } 1340884d179dSJan Kara EXPORT_SYMBOL(vfs_dq_drop); 1341884d179dSJan Kara 1342884d179dSJan Kara /* 1343fd8fbfc1SDmitry Monakhov * inode_reserved_space is managed internally by quota, and protected by 1344fd8fbfc1SDmitry Monakhov * i_lock similar to i_blocks+i_bytes. 1345fd8fbfc1SDmitry Monakhov */ 1346fd8fbfc1SDmitry Monakhov static qsize_t *inode_reserved_space(struct inode * inode) 1347fd8fbfc1SDmitry Monakhov { 1348fd8fbfc1SDmitry Monakhov /* Filesystem must explicitly define it's own method in order to use 1349fd8fbfc1SDmitry Monakhov * quota reservation interface */ 1350fd8fbfc1SDmitry Monakhov BUG_ON(!inode->i_sb->dq_op->get_reserved_space); 1351fd8fbfc1SDmitry Monakhov return inode->i_sb->dq_op->get_reserved_space(inode); 1352fd8fbfc1SDmitry Monakhov } 1353fd8fbfc1SDmitry Monakhov 1354fd8fbfc1SDmitry Monakhov static void inode_add_rsv_space(struct inode *inode, qsize_t number) 1355fd8fbfc1SDmitry Monakhov { 1356fd8fbfc1SDmitry Monakhov spin_lock(&inode->i_lock); 1357fd8fbfc1SDmitry Monakhov *inode_reserved_space(inode) += number; 1358fd8fbfc1SDmitry Monakhov spin_unlock(&inode->i_lock); 1359fd8fbfc1SDmitry Monakhov } 1360fd8fbfc1SDmitry Monakhov 1361fd8fbfc1SDmitry Monakhov 1362fd8fbfc1SDmitry Monakhov static void inode_claim_rsv_space(struct inode *inode, qsize_t number) 1363fd8fbfc1SDmitry Monakhov { 1364fd8fbfc1SDmitry Monakhov spin_lock(&inode->i_lock); 1365fd8fbfc1SDmitry Monakhov *inode_reserved_space(inode) -= number; 1366fd8fbfc1SDmitry Monakhov __inode_add_bytes(inode, number); 1367fd8fbfc1SDmitry Monakhov spin_unlock(&inode->i_lock); 1368fd8fbfc1SDmitry Monakhov } 1369fd8fbfc1SDmitry Monakhov 1370fd8fbfc1SDmitry Monakhov static void inode_sub_rsv_space(struct inode *inode, qsize_t number) 1371fd8fbfc1SDmitry Monakhov { 1372fd8fbfc1SDmitry Monakhov spin_lock(&inode->i_lock); 1373fd8fbfc1SDmitry Monakhov *inode_reserved_space(inode) -= number; 1374fd8fbfc1SDmitry Monakhov spin_unlock(&inode->i_lock); 1375fd8fbfc1SDmitry Monakhov } 1376fd8fbfc1SDmitry Monakhov 1377fd8fbfc1SDmitry Monakhov static qsize_t inode_get_rsv_space(struct inode *inode) 1378fd8fbfc1SDmitry Monakhov { 1379fd8fbfc1SDmitry Monakhov qsize_t ret; 1380*05b5d898SJan Kara 1381*05b5d898SJan Kara if (!inode->i_sb->dq_op->get_reserved_space) 1382*05b5d898SJan Kara return 0; 1383fd8fbfc1SDmitry Monakhov spin_lock(&inode->i_lock); 1384fd8fbfc1SDmitry Monakhov ret = *inode_reserved_space(inode); 1385fd8fbfc1SDmitry Monakhov spin_unlock(&inode->i_lock); 1386fd8fbfc1SDmitry Monakhov return ret; 1387fd8fbfc1SDmitry Monakhov } 1388fd8fbfc1SDmitry Monakhov 1389fd8fbfc1SDmitry Monakhov static void inode_incr_space(struct inode *inode, qsize_t number, 1390fd8fbfc1SDmitry Monakhov int reserve) 1391fd8fbfc1SDmitry Monakhov { 1392fd8fbfc1SDmitry Monakhov if (reserve) 1393fd8fbfc1SDmitry Monakhov inode_add_rsv_space(inode, number); 1394fd8fbfc1SDmitry Monakhov else 1395fd8fbfc1SDmitry Monakhov inode_add_bytes(inode, number); 1396fd8fbfc1SDmitry Monakhov } 1397fd8fbfc1SDmitry Monakhov 1398fd8fbfc1SDmitry Monakhov static void inode_decr_space(struct inode *inode, qsize_t number, int reserve) 1399fd8fbfc1SDmitry Monakhov { 1400fd8fbfc1SDmitry Monakhov if (reserve) 1401fd8fbfc1SDmitry Monakhov inode_sub_rsv_space(inode, number); 1402fd8fbfc1SDmitry Monakhov else 1403fd8fbfc1SDmitry Monakhov inode_sub_bytes(inode, number); 1404fd8fbfc1SDmitry Monakhov } 1405fd8fbfc1SDmitry Monakhov 1406fd8fbfc1SDmitry Monakhov /* 1407884d179dSJan Kara * Following four functions update i_blocks+i_bytes fields and 1408884d179dSJan Kara * quota information (together with appropriate checks) 1409884d179dSJan Kara * NOTE: We absolutely rely on the fact that caller dirties 1410884d179dSJan Kara * the inode (usually macros in quotaops.h care about this) and 1411884d179dSJan Kara * holds a handle for the current transaction so that dquot write and 1412884d179dSJan Kara * inode write go into the same transaction. 1413884d179dSJan Kara */ 1414884d179dSJan Kara 1415884d179dSJan Kara /* 1416884d179dSJan Kara * This operation can block, but only after everything is updated 1417884d179dSJan Kara */ 1418884d179dSJan Kara int __dquot_alloc_space(struct inode *inode, qsize_t number, 1419884d179dSJan Kara int warn, int reserve) 1420884d179dSJan Kara { 1421884d179dSJan Kara int cnt, ret = QUOTA_OK; 1422884d179dSJan Kara char warntype[MAXQUOTAS]; 1423884d179dSJan Kara 1424fd8fbfc1SDmitry Monakhov /* 1425fd8fbfc1SDmitry Monakhov * First test before acquiring mutex - solves deadlocks when we 1426fd8fbfc1SDmitry Monakhov * re-enter the quota code and are already holding the mutex 1427fd8fbfc1SDmitry Monakhov */ 1428fd8fbfc1SDmitry Monakhov if (IS_NOQUOTA(inode)) { 1429fd8fbfc1SDmitry Monakhov inode_incr_space(inode, number, reserve); 1430fd8fbfc1SDmitry Monakhov goto out; 1431fd8fbfc1SDmitry Monakhov } 1432fd8fbfc1SDmitry Monakhov 1433fd8fbfc1SDmitry Monakhov down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1434fd8fbfc1SDmitry Monakhov if (IS_NOQUOTA(inode)) { 1435fd8fbfc1SDmitry Monakhov inode_incr_space(inode, number, reserve); 1436fd8fbfc1SDmitry Monakhov goto out_unlock; 1437fd8fbfc1SDmitry Monakhov } 1438fd8fbfc1SDmitry Monakhov 1439884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 1440884d179dSJan Kara warntype[cnt] = QUOTA_NL_NOWARN; 1441884d179dSJan Kara 1442884d179dSJan Kara spin_lock(&dq_data_lock); 1443884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1444dd6f3c6dSJan Kara if (!inode->i_dquot[cnt]) 1445884d179dSJan Kara continue; 1446884d179dSJan Kara if (check_bdq(inode->i_dquot[cnt], number, warn, warntype+cnt) 1447884d179dSJan Kara == NO_QUOTA) { 1448884d179dSJan Kara ret = NO_QUOTA; 1449fd8fbfc1SDmitry Monakhov spin_unlock(&dq_data_lock); 1450fd8fbfc1SDmitry Monakhov goto out_flush_warn; 1451884d179dSJan Kara } 1452884d179dSJan Kara } 1453884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1454dd6f3c6dSJan Kara if (!inode->i_dquot[cnt]) 1455884d179dSJan Kara continue; 1456884d179dSJan Kara if (reserve) 1457884d179dSJan Kara dquot_resv_space(inode->i_dquot[cnt], number); 1458884d179dSJan Kara else 1459884d179dSJan Kara dquot_incr_space(inode->i_dquot[cnt], number); 1460884d179dSJan Kara } 1461fd8fbfc1SDmitry Monakhov inode_incr_space(inode, number, reserve); 1462884d179dSJan Kara spin_unlock(&dq_data_lock); 1463fd8fbfc1SDmitry Monakhov 1464fd8fbfc1SDmitry Monakhov if (reserve) 1465fd8fbfc1SDmitry Monakhov goto out_flush_warn; 1466dc52dd3aSDmitry Monakhov mark_all_dquot_dirty(inode->i_dquot); 1467fd8fbfc1SDmitry Monakhov out_flush_warn: 1468884d179dSJan Kara flush_warnings(inode->i_dquot, warntype); 1469fd8fbfc1SDmitry Monakhov out_unlock: 1470fd8fbfc1SDmitry Monakhov up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1471fd8fbfc1SDmitry Monakhov out: 1472884d179dSJan Kara return ret; 1473884d179dSJan Kara } 1474884d179dSJan Kara 1475884d179dSJan Kara int dquot_alloc_space(struct inode *inode, qsize_t number, int warn) 1476884d179dSJan Kara { 1477fd8fbfc1SDmitry Monakhov return __dquot_alloc_space(inode, number, warn, 0); 1478884d179dSJan Kara } 1479884d179dSJan Kara EXPORT_SYMBOL(dquot_alloc_space); 1480884d179dSJan Kara 1481884d179dSJan Kara int dquot_reserve_space(struct inode *inode, qsize_t number, int warn) 1482884d179dSJan Kara { 1483fd8fbfc1SDmitry Monakhov return __dquot_alloc_space(inode, number, warn, 1); 1484884d179dSJan Kara } 1485884d179dSJan Kara EXPORT_SYMBOL(dquot_reserve_space); 1486884d179dSJan Kara 1487884d179dSJan Kara /* 1488884d179dSJan Kara * This operation can block, but only after everything is updated 1489884d179dSJan Kara */ 1490884d179dSJan Kara int dquot_alloc_inode(const struct inode *inode, qsize_t number) 1491884d179dSJan Kara { 1492884d179dSJan Kara int cnt, ret = NO_QUOTA; 1493884d179dSJan Kara char warntype[MAXQUOTAS]; 1494884d179dSJan Kara 1495884d179dSJan Kara /* First test before acquiring mutex - solves deadlocks when we 1496884d179dSJan Kara * re-enter the quota code and are already holding the mutex */ 1497884d179dSJan Kara if (IS_NOQUOTA(inode)) 1498884d179dSJan Kara return QUOTA_OK; 1499884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 1500884d179dSJan Kara warntype[cnt] = QUOTA_NL_NOWARN; 1501884d179dSJan Kara down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1502884d179dSJan Kara if (IS_NOQUOTA(inode)) { 1503884d179dSJan Kara up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1504884d179dSJan Kara return QUOTA_OK; 1505884d179dSJan Kara } 1506884d179dSJan Kara spin_lock(&dq_data_lock); 1507884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1508dd6f3c6dSJan Kara if (!inode->i_dquot[cnt]) 1509884d179dSJan Kara continue; 1510268157baSJan Kara if (check_idq(inode->i_dquot[cnt], number, warntype+cnt) 1511268157baSJan Kara == NO_QUOTA) 1512884d179dSJan Kara goto warn_put_all; 1513884d179dSJan Kara } 1514884d179dSJan Kara 1515884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1516dd6f3c6dSJan Kara if (!inode->i_dquot[cnt]) 1517884d179dSJan Kara continue; 1518884d179dSJan Kara dquot_incr_inodes(inode->i_dquot[cnt], number); 1519884d179dSJan Kara } 1520884d179dSJan Kara ret = QUOTA_OK; 1521884d179dSJan Kara warn_put_all: 1522884d179dSJan Kara spin_unlock(&dq_data_lock); 1523884d179dSJan Kara if (ret == QUOTA_OK) 1524dc52dd3aSDmitry Monakhov mark_all_dquot_dirty(inode->i_dquot); 1525884d179dSJan Kara flush_warnings(inode->i_dquot, warntype); 1526884d179dSJan Kara up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1527884d179dSJan Kara return ret; 1528884d179dSJan Kara } 1529884d179dSJan Kara EXPORT_SYMBOL(dquot_alloc_inode); 1530884d179dSJan Kara 1531884d179dSJan Kara int dquot_claim_space(struct inode *inode, qsize_t number) 1532884d179dSJan Kara { 1533884d179dSJan Kara int cnt; 1534884d179dSJan Kara int ret = QUOTA_OK; 1535884d179dSJan Kara 1536884d179dSJan Kara if (IS_NOQUOTA(inode)) { 1537fd8fbfc1SDmitry Monakhov inode_claim_rsv_space(inode, number); 1538884d179dSJan Kara goto out; 1539884d179dSJan Kara } 1540884d179dSJan Kara 1541884d179dSJan Kara down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1542884d179dSJan Kara if (IS_NOQUOTA(inode)) { 1543884d179dSJan Kara up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1544fd8fbfc1SDmitry Monakhov inode_claim_rsv_space(inode, number); 1545884d179dSJan Kara goto out; 1546884d179dSJan Kara } 1547884d179dSJan Kara 1548884d179dSJan Kara spin_lock(&dq_data_lock); 1549884d179dSJan Kara /* Claim reserved quotas to allocated quotas */ 1550884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1551dd6f3c6dSJan Kara if (inode->i_dquot[cnt]) 1552884d179dSJan Kara dquot_claim_reserved_space(inode->i_dquot[cnt], 1553884d179dSJan Kara number); 1554884d179dSJan Kara } 1555884d179dSJan Kara /* Update inode bytes */ 1556fd8fbfc1SDmitry Monakhov inode_claim_rsv_space(inode, number); 1557884d179dSJan Kara spin_unlock(&dq_data_lock); 1558dc52dd3aSDmitry Monakhov mark_all_dquot_dirty(inode->i_dquot); 1559884d179dSJan Kara up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1560884d179dSJan Kara out: 1561884d179dSJan Kara return ret; 1562884d179dSJan Kara } 1563884d179dSJan Kara EXPORT_SYMBOL(dquot_claim_space); 1564884d179dSJan Kara 1565884d179dSJan Kara /* 1566884d179dSJan Kara * This operation can block, but only after everything is updated 1567884d179dSJan Kara */ 1568fd8fbfc1SDmitry Monakhov int __dquot_free_space(struct inode *inode, qsize_t number, int reserve) 1569884d179dSJan Kara { 1570884d179dSJan Kara unsigned int cnt; 1571884d179dSJan Kara char warntype[MAXQUOTAS]; 1572884d179dSJan Kara 1573884d179dSJan Kara /* First test before acquiring mutex - solves deadlocks when we 1574884d179dSJan Kara * re-enter the quota code and are already holding the mutex */ 1575884d179dSJan Kara if (IS_NOQUOTA(inode)) { 1576884d179dSJan Kara out_sub: 1577fd8fbfc1SDmitry Monakhov inode_decr_space(inode, number, reserve); 1578884d179dSJan Kara return QUOTA_OK; 1579884d179dSJan Kara } 1580884d179dSJan Kara 1581884d179dSJan Kara down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1582884d179dSJan Kara /* Now recheck reliably when holding dqptr_sem */ 1583884d179dSJan Kara if (IS_NOQUOTA(inode)) { 1584884d179dSJan Kara up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1585884d179dSJan Kara goto out_sub; 1586884d179dSJan Kara } 1587884d179dSJan Kara spin_lock(&dq_data_lock); 1588884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1589dd6f3c6dSJan Kara if (!inode->i_dquot[cnt]) 1590884d179dSJan Kara continue; 1591884d179dSJan Kara warntype[cnt] = info_bdq_free(inode->i_dquot[cnt], number); 1592fd8fbfc1SDmitry Monakhov if (reserve) 1593fd8fbfc1SDmitry Monakhov dquot_free_reserved_space(inode->i_dquot[cnt], number); 1594fd8fbfc1SDmitry Monakhov else 1595884d179dSJan Kara dquot_decr_space(inode->i_dquot[cnt], number); 1596884d179dSJan Kara } 1597fd8fbfc1SDmitry Monakhov inode_decr_space(inode, number, reserve); 1598884d179dSJan Kara spin_unlock(&dq_data_lock); 1599fd8fbfc1SDmitry Monakhov 1600fd8fbfc1SDmitry Monakhov if (reserve) 1601fd8fbfc1SDmitry Monakhov goto out_unlock; 1602dc52dd3aSDmitry Monakhov mark_all_dquot_dirty(inode->i_dquot); 1603fd8fbfc1SDmitry Monakhov out_unlock: 1604884d179dSJan Kara flush_warnings(inode->i_dquot, warntype); 1605884d179dSJan Kara up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1606884d179dSJan Kara return QUOTA_OK; 1607884d179dSJan Kara } 1608fd8fbfc1SDmitry Monakhov 1609fd8fbfc1SDmitry Monakhov int dquot_free_space(struct inode *inode, qsize_t number) 1610fd8fbfc1SDmitry Monakhov { 1611fd8fbfc1SDmitry Monakhov return __dquot_free_space(inode, number, 0); 1612fd8fbfc1SDmitry Monakhov } 1613884d179dSJan Kara EXPORT_SYMBOL(dquot_free_space); 1614884d179dSJan Kara 1615884d179dSJan Kara /* 1616fd8fbfc1SDmitry Monakhov * Release reserved quota space 1617fd8fbfc1SDmitry Monakhov */ 1618fd8fbfc1SDmitry Monakhov void dquot_release_reserved_space(struct inode *inode, qsize_t number) 1619fd8fbfc1SDmitry Monakhov { 1620fd8fbfc1SDmitry Monakhov __dquot_free_space(inode, number, 1); 1621fd8fbfc1SDmitry Monakhov 1622fd8fbfc1SDmitry Monakhov } 1623fd8fbfc1SDmitry Monakhov EXPORT_SYMBOL(dquot_release_reserved_space); 1624fd8fbfc1SDmitry Monakhov 1625fd8fbfc1SDmitry Monakhov /* 1626884d179dSJan Kara * This operation can block, but only after everything is updated 1627884d179dSJan Kara */ 1628884d179dSJan Kara int dquot_free_inode(const struct inode *inode, qsize_t number) 1629884d179dSJan Kara { 1630884d179dSJan Kara unsigned int cnt; 1631884d179dSJan Kara char warntype[MAXQUOTAS]; 1632884d179dSJan Kara 1633884d179dSJan Kara /* First test before acquiring mutex - solves deadlocks when we 1634884d179dSJan Kara * re-enter the quota code and are already holding the mutex */ 1635884d179dSJan Kara if (IS_NOQUOTA(inode)) 1636884d179dSJan Kara return QUOTA_OK; 1637884d179dSJan Kara 1638884d179dSJan Kara down_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1639884d179dSJan Kara /* Now recheck reliably when holding dqptr_sem */ 1640884d179dSJan Kara if (IS_NOQUOTA(inode)) { 1641884d179dSJan Kara up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1642884d179dSJan Kara return QUOTA_OK; 1643884d179dSJan Kara } 1644884d179dSJan Kara spin_lock(&dq_data_lock); 1645884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1646dd6f3c6dSJan Kara if (!inode->i_dquot[cnt]) 1647884d179dSJan Kara continue; 1648884d179dSJan Kara warntype[cnt] = info_idq_free(inode->i_dquot[cnt], number); 1649884d179dSJan Kara dquot_decr_inodes(inode->i_dquot[cnt], number); 1650884d179dSJan Kara } 1651884d179dSJan Kara spin_unlock(&dq_data_lock); 1652dc52dd3aSDmitry Monakhov mark_all_dquot_dirty(inode->i_dquot); 1653884d179dSJan Kara flush_warnings(inode->i_dquot, warntype); 1654884d179dSJan Kara up_read(&sb_dqopt(inode->i_sb)->dqptr_sem); 1655884d179dSJan Kara return QUOTA_OK; 1656884d179dSJan Kara } 1657884d179dSJan Kara EXPORT_SYMBOL(dquot_free_inode); 1658884d179dSJan Kara 1659884d179dSJan Kara /* 1660884d179dSJan Kara * Transfer the number of inode and blocks from one diskquota to an other. 1661884d179dSJan Kara * 1662884d179dSJan Kara * This operation can block, but only after everything is updated 1663884d179dSJan Kara * A transaction must be started when entering this function. 1664884d179dSJan Kara */ 1665884d179dSJan Kara int dquot_transfer(struct inode *inode, struct iattr *iattr) 1666884d179dSJan Kara { 1667884d179dSJan Kara qsize_t space, cur_space; 1668884d179dSJan Kara qsize_t rsv_space = 0; 1669884d179dSJan Kara struct dquot *transfer_from[MAXQUOTAS]; 1670884d179dSJan Kara struct dquot *transfer_to[MAXQUOTAS]; 1671884d179dSJan Kara int cnt, ret = QUOTA_OK; 1672884d179dSJan Kara int chuid = iattr->ia_valid & ATTR_UID && inode->i_uid != iattr->ia_uid, 1673884d179dSJan Kara chgid = iattr->ia_valid & ATTR_GID && inode->i_gid != iattr->ia_gid; 1674884d179dSJan Kara char warntype_to[MAXQUOTAS]; 1675884d179dSJan Kara char warntype_from_inodes[MAXQUOTAS], warntype_from_space[MAXQUOTAS]; 1676884d179dSJan Kara 1677884d179dSJan Kara /* First test before acquiring mutex - solves deadlocks when we 1678884d179dSJan Kara * re-enter the quota code and are already holding the mutex */ 1679884d179dSJan Kara if (IS_NOQUOTA(inode)) 1680884d179dSJan Kara return QUOTA_OK; 1681884d179dSJan Kara /* Initialize the arrays */ 1682884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1683dd6f3c6dSJan Kara transfer_from[cnt] = NULL; 1684dd6f3c6dSJan Kara transfer_to[cnt] = NULL; 1685884d179dSJan Kara warntype_to[cnt] = QUOTA_NL_NOWARN; 1686884d179dSJan Kara } 1687268157baSJan Kara if (chuid) 1688268157baSJan Kara transfer_to[USRQUOTA] = dqget(inode->i_sb, iattr->ia_uid, 1689268157baSJan Kara USRQUOTA); 1690268157baSJan Kara if (chgid) 1691268157baSJan Kara transfer_to[GRPQUOTA] = dqget(inode->i_sb, iattr->ia_gid, 1692268157baSJan Kara GRPQUOTA); 1693884d179dSJan Kara 1694884d179dSJan Kara down_write(&sb_dqopt(inode->i_sb)->dqptr_sem); 1695884d179dSJan Kara /* Now recheck reliably when holding dqptr_sem */ 1696884d179dSJan Kara if (IS_NOQUOTA(inode)) { /* File without quota accounting? */ 1697884d179dSJan Kara up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); 1698884d179dSJan Kara goto put_all; 1699884d179dSJan Kara } 1700884d179dSJan Kara spin_lock(&dq_data_lock); 1701884d179dSJan Kara cur_space = inode_get_bytes(inode); 1702fd8fbfc1SDmitry Monakhov rsv_space = inode_get_rsv_space(inode); 1703884d179dSJan Kara space = cur_space + rsv_space; 1704884d179dSJan Kara /* Build the transfer_from list and check the limits */ 1705884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1706dd6f3c6dSJan Kara if (!transfer_to[cnt]) 1707884d179dSJan Kara continue; 1708884d179dSJan Kara transfer_from[cnt] = inode->i_dquot[cnt]; 1709884d179dSJan Kara if (check_idq(transfer_to[cnt], 1, warntype_to + cnt) == 1710884d179dSJan Kara NO_QUOTA || check_bdq(transfer_to[cnt], space, 0, 1711884d179dSJan Kara warntype_to + cnt) == NO_QUOTA) 1712884d179dSJan Kara goto over_quota; 1713884d179dSJan Kara } 1714884d179dSJan Kara 1715884d179dSJan Kara /* 1716884d179dSJan Kara * Finally perform the needed transfer from transfer_from to transfer_to 1717884d179dSJan Kara */ 1718884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1719884d179dSJan Kara /* 1720884d179dSJan Kara * Skip changes for same uid or gid or for turned off quota-type. 1721884d179dSJan Kara */ 1722dd6f3c6dSJan Kara if (!transfer_to[cnt]) 1723884d179dSJan Kara continue; 1724884d179dSJan Kara 1725884d179dSJan Kara /* Due to IO error we might not have transfer_from[] structure */ 1726884d179dSJan Kara if (transfer_from[cnt]) { 1727884d179dSJan Kara warntype_from_inodes[cnt] = 1728884d179dSJan Kara info_idq_free(transfer_from[cnt], 1); 1729884d179dSJan Kara warntype_from_space[cnt] = 1730884d179dSJan Kara info_bdq_free(transfer_from[cnt], space); 1731884d179dSJan Kara dquot_decr_inodes(transfer_from[cnt], 1); 1732884d179dSJan Kara dquot_decr_space(transfer_from[cnt], cur_space); 1733884d179dSJan Kara dquot_free_reserved_space(transfer_from[cnt], 1734884d179dSJan Kara rsv_space); 1735884d179dSJan Kara } 1736884d179dSJan Kara 1737884d179dSJan Kara dquot_incr_inodes(transfer_to[cnt], 1); 1738884d179dSJan Kara dquot_incr_space(transfer_to[cnt], cur_space); 1739884d179dSJan Kara dquot_resv_space(transfer_to[cnt], rsv_space); 1740884d179dSJan Kara 1741884d179dSJan Kara inode->i_dquot[cnt] = transfer_to[cnt]; 1742884d179dSJan Kara } 1743884d179dSJan Kara spin_unlock(&dq_data_lock); 1744884d179dSJan Kara up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); 1745884d179dSJan Kara 1746dc52dd3aSDmitry Monakhov mark_all_dquot_dirty(transfer_from); 1747dc52dd3aSDmitry Monakhov mark_all_dquot_dirty(transfer_to); 1748884d179dSJan Kara /* The reference we got is transferred to the inode */ 1749dc52dd3aSDmitry Monakhov for (cnt = 0; cnt < MAXQUOTAS; cnt++) 1750dd6f3c6dSJan Kara transfer_to[cnt] = NULL; 1751884d179dSJan Kara warn_put_all: 1752884d179dSJan Kara flush_warnings(transfer_to, warntype_to); 1753884d179dSJan Kara flush_warnings(transfer_from, warntype_from_inodes); 1754884d179dSJan Kara flush_warnings(transfer_from, warntype_from_space); 1755884d179dSJan Kara put_all: 1756dc52dd3aSDmitry Monakhov dqput_all(transfer_from); 1757dc52dd3aSDmitry Monakhov dqput_all(transfer_to); 1758884d179dSJan Kara return ret; 1759884d179dSJan Kara over_quota: 1760884d179dSJan Kara spin_unlock(&dq_data_lock); 1761884d179dSJan Kara up_write(&sb_dqopt(inode->i_sb)->dqptr_sem); 1762884d179dSJan Kara /* Clear dquot pointers we don't want to dqput() */ 1763884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 1764dd6f3c6dSJan Kara transfer_from[cnt] = NULL; 1765884d179dSJan Kara ret = NO_QUOTA; 1766884d179dSJan Kara goto warn_put_all; 1767884d179dSJan Kara } 1768884d179dSJan Kara EXPORT_SYMBOL(dquot_transfer); 1769884d179dSJan Kara 1770884d179dSJan Kara /* Wrapper for transferring ownership of an inode */ 1771884d179dSJan Kara int vfs_dq_transfer(struct inode *inode, struct iattr *iattr) 1772884d179dSJan Kara { 1773884d179dSJan Kara if (sb_any_quota_active(inode->i_sb) && !IS_NOQUOTA(inode)) { 1774884d179dSJan Kara vfs_dq_init(inode); 1775884d179dSJan Kara if (inode->i_sb->dq_op->transfer(inode, iattr) == NO_QUOTA) 1776884d179dSJan Kara return 1; 1777884d179dSJan Kara } 1778884d179dSJan Kara return 0; 1779884d179dSJan Kara } 1780884d179dSJan Kara EXPORT_SYMBOL(vfs_dq_transfer); 1781884d179dSJan Kara 1782884d179dSJan Kara /* 1783884d179dSJan Kara * Write info of quota file to disk 1784884d179dSJan Kara */ 1785884d179dSJan Kara int dquot_commit_info(struct super_block *sb, int type) 1786884d179dSJan Kara { 1787884d179dSJan Kara int ret; 1788884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 1789884d179dSJan Kara 1790884d179dSJan Kara mutex_lock(&dqopt->dqio_mutex); 1791884d179dSJan Kara ret = dqopt->ops[type]->write_file_info(sb, type); 1792884d179dSJan Kara mutex_unlock(&dqopt->dqio_mutex); 1793884d179dSJan Kara return ret; 1794884d179dSJan Kara } 1795884d179dSJan Kara EXPORT_SYMBOL(dquot_commit_info); 1796884d179dSJan Kara 1797884d179dSJan Kara /* 1798884d179dSJan Kara * Definitions of diskquota operations. 1799884d179dSJan Kara */ 180061e225dcSAlexey Dobriyan const struct dquot_operations dquot_operations = { 1801884d179dSJan Kara .initialize = dquot_initialize, 1802884d179dSJan Kara .drop = dquot_drop, 1803884d179dSJan Kara .alloc_space = dquot_alloc_space, 1804884d179dSJan Kara .alloc_inode = dquot_alloc_inode, 1805884d179dSJan Kara .free_space = dquot_free_space, 1806884d179dSJan Kara .free_inode = dquot_free_inode, 1807884d179dSJan Kara .transfer = dquot_transfer, 1808884d179dSJan Kara .write_dquot = dquot_commit, 1809884d179dSJan Kara .acquire_dquot = dquot_acquire, 1810884d179dSJan Kara .release_dquot = dquot_release, 1811884d179dSJan Kara .mark_dirty = dquot_mark_dquot_dirty, 1812884d179dSJan Kara .write_info = dquot_commit_info, 1813884d179dSJan Kara .alloc_dquot = dquot_alloc, 1814884d179dSJan Kara .destroy_dquot = dquot_destroy, 1815884d179dSJan Kara }; 1816884d179dSJan Kara 1817884d179dSJan Kara /* 1818884d179dSJan Kara * Turn quota off on a device. type == -1 ==> quotaoff for all types (umount) 1819884d179dSJan Kara */ 1820884d179dSJan Kara int vfs_quota_disable(struct super_block *sb, int type, unsigned int flags) 1821884d179dSJan Kara { 1822884d179dSJan Kara int cnt, ret = 0; 1823884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 1824884d179dSJan Kara struct inode *toputinode[MAXQUOTAS]; 1825884d179dSJan Kara 1826884d179dSJan Kara /* Cannot turn off usage accounting without turning off limits, or 1827884d179dSJan Kara * suspend quotas and simultaneously turn quotas off. */ 1828884d179dSJan Kara if ((flags & DQUOT_USAGE_ENABLED && !(flags & DQUOT_LIMITS_ENABLED)) 1829884d179dSJan Kara || (flags & DQUOT_SUSPENDED && flags & (DQUOT_LIMITS_ENABLED | 1830884d179dSJan Kara DQUOT_USAGE_ENABLED))) 1831884d179dSJan Kara return -EINVAL; 1832884d179dSJan Kara 1833884d179dSJan Kara /* We need to serialize quota_off() for device */ 1834884d179dSJan Kara mutex_lock(&dqopt->dqonoff_mutex); 1835884d179dSJan Kara 1836884d179dSJan Kara /* 1837884d179dSJan Kara * Skip everything if there's nothing to do. We have to do this because 1838884d179dSJan Kara * sometimes we are called when fill_super() failed and calling 1839884d179dSJan Kara * sync_fs() in such cases does no good. 1840884d179dSJan Kara */ 1841884d179dSJan Kara if (!sb_any_quota_loaded(sb)) { 1842884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 1843884d179dSJan Kara return 0; 1844884d179dSJan Kara } 1845884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 1846884d179dSJan Kara toputinode[cnt] = NULL; 1847884d179dSJan Kara if (type != -1 && cnt != type) 1848884d179dSJan Kara continue; 1849884d179dSJan Kara if (!sb_has_quota_loaded(sb, cnt)) 1850884d179dSJan Kara continue; 1851884d179dSJan Kara 1852884d179dSJan Kara if (flags & DQUOT_SUSPENDED) { 1853884d179dSJan Kara spin_lock(&dq_state_lock); 1854884d179dSJan Kara dqopt->flags |= 1855884d179dSJan Kara dquot_state_flag(DQUOT_SUSPENDED, cnt); 1856884d179dSJan Kara spin_unlock(&dq_state_lock); 1857884d179dSJan Kara } else { 1858884d179dSJan Kara spin_lock(&dq_state_lock); 1859884d179dSJan Kara dqopt->flags &= ~dquot_state_flag(flags, cnt); 1860884d179dSJan Kara /* Turning off suspended quotas? */ 1861884d179dSJan Kara if (!sb_has_quota_loaded(sb, cnt) && 1862884d179dSJan Kara sb_has_quota_suspended(sb, cnt)) { 1863884d179dSJan Kara dqopt->flags &= ~dquot_state_flag( 1864884d179dSJan Kara DQUOT_SUSPENDED, cnt); 1865884d179dSJan Kara spin_unlock(&dq_state_lock); 1866884d179dSJan Kara iput(dqopt->files[cnt]); 1867884d179dSJan Kara dqopt->files[cnt] = NULL; 1868884d179dSJan Kara continue; 1869884d179dSJan Kara } 1870884d179dSJan Kara spin_unlock(&dq_state_lock); 1871884d179dSJan Kara } 1872884d179dSJan Kara 1873884d179dSJan Kara /* We still have to keep quota loaded? */ 1874884d179dSJan Kara if (sb_has_quota_loaded(sb, cnt) && !(flags & DQUOT_SUSPENDED)) 1875884d179dSJan Kara continue; 1876884d179dSJan Kara 1877884d179dSJan Kara /* Note: these are blocking operations */ 1878884d179dSJan Kara drop_dquot_ref(sb, cnt); 1879884d179dSJan Kara invalidate_dquots(sb, cnt); 1880884d179dSJan Kara /* 1881268157baSJan Kara * Now all dquots should be invalidated, all writes done so we 1882268157baSJan Kara * should be only users of the info. No locks needed. 1883884d179dSJan Kara */ 1884884d179dSJan Kara if (info_dirty(&dqopt->info[cnt])) 1885884d179dSJan Kara sb->dq_op->write_info(sb, cnt); 1886884d179dSJan Kara if (dqopt->ops[cnt]->free_file_info) 1887884d179dSJan Kara dqopt->ops[cnt]->free_file_info(sb, cnt); 1888884d179dSJan Kara put_quota_format(dqopt->info[cnt].dqi_format); 1889884d179dSJan Kara 1890884d179dSJan Kara toputinode[cnt] = dqopt->files[cnt]; 1891884d179dSJan Kara if (!sb_has_quota_loaded(sb, cnt)) 1892884d179dSJan Kara dqopt->files[cnt] = NULL; 1893884d179dSJan Kara dqopt->info[cnt].dqi_flags = 0; 1894884d179dSJan Kara dqopt->info[cnt].dqi_igrace = 0; 1895884d179dSJan Kara dqopt->info[cnt].dqi_bgrace = 0; 1896884d179dSJan Kara dqopt->ops[cnt] = NULL; 1897884d179dSJan Kara } 1898884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 1899884d179dSJan Kara 1900884d179dSJan Kara /* Skip syncing and setting flags if quota files are hidden */ 1901884d179dSJan Kara if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) 1902884d179dSJan Kara goto put_inodes; 1903884d179dSJan Kara 1904884d179dSJan Kara /* Sync the superblock so that buffers with quota data are written to 1905884d179dSJan Kara * disk (and so userspace sees correct data afterwards). */ 1906884d179dSJan Kara if (sb->s_op->sync_fs) 1907884d179dSJan Kara sb->s_op->sync_fs(sb, 1); 1908884d179dSJan Kara sync_blockdev(sb->s_bdev); 1909884d179dSJan Kara /* Now the quota files are just ordinary files and we can set the 1910884d179dSJan Kara * inode flags back. Moreover we discard the pagecache so that 1911884d179dSJan Kara * userspace sees the writes we did bypassing the pagecache. We 1912884d179dSJan Kara * must also discard the blockdev buffers so that we see the 1913884d179dSJan Kara * changes done by userspace on the next quotaon() */ 1914884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 1915884d179dSJan Kara if (toputinode[cnt]) { 1916884d179dSJan Kara mutex_lock(&dqopt->dqonoff_mutex); 1917884d179dSJan Kara /* If quota was reenabled in the meantime, we have 1918884d179dSJan Kara * nothing to do */ 1919884d179dSJan Kara if (!sb_has_quota_loaded(sb, cnt)) { 1920268157baSJan Kara mutex_lock_nested(&toputinode[cnt]->i_mutex, 1921268157baSJan Kara I_MUTEX_QUOTA); 1922884d179dSJan Kara toputinode[cnt]->i_flags &= ~(S_IMMUTABLE | 1923884d179dSJan Kara S_NOATIME | S_NOQUOTA); 1924268157baSJan Kara truncate_inode_pages(&toputinode[cnt]->i_data, 1925268157baSJan Kara 0); 1926884d179dSJan Kara mutex_unlock(&toputinode[cnt]->i_mutex); 1927884d179dSJan Kara mark_inode_dirty(toputinode[cnt]); 1928884d179dSJan Kara } 1929884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 1930884d179dSJan Kara } 1931884d179dSJan Kara if (sb->s_bdev) 1932884d179dSJan Kara invalidate_bdev(sb->s_bdev); 1933884d179dSJan Kara put_inodes: 1934884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) 1935884d179dSJan Kara if (toputinode[cnt]) { 1936884d179dSJan Kara /* On remount RO, we keep the inode pointer so that we 1937884d179dSJan Kara * can reenable quota on the subsequent remount RW. We 1938884d179dSJan Kara * have to check 'flags' variable and not use sb_has_ 1939884d179dSJan Kara * function because another quotaon / quotaoff could 1940884d179dSJan Kara * change global state before we got here. We refuse 1941884d179dSJan Kara * to suspend quotas when there is pending delete on 1942884d179dSJan Kara * the quota file... */ 1943884d179dSJan Kara if (!(flags & DQUOT_SUSPENDED)) 1944884d179dSJan Kara iput(toputinode[cnt]); 1945884d179dSJan Kara else if (!toputinode[cnt]->i_nlink) 1946884d179dSJan Kara ret = -EBUSY; 1947884d179dSJan Kara } 1948884d179dSJan Kara return ret; 1949884d179dSJan Kara } 1950884d179dSJan Kara EXPORT_SYMBOL(vfs_quota_disable); 1951884d179dSJan Kara 1952884d179dSJan Kara int vfs_quota_off(struct super_block *sb, int type, int remount) 1953884d179dSJan Kara { 1954884d179dSJan Kara return vfs_quota_disable(sb, type, remount ? DQUOT_SUSPENDED : 1955884d179dSJan Kara (DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED)); 1956884d179dSJan Kara } 1957884d179dSJan Kara EXPORT_SYMBOL(vfs_quota_off); 1958884d179dSJan Kara /* 1959884d179dSJan Kara * Turn quotas on on a device 1960884d179dSJan Kara */ 1961884d179dSJan Kara 1962884d179dSJan Kara /* 1963884d179dSJan Kara * Helper function to turn quotas on when we already have the inode of 1964884d179dSJan Kara * quota file and no quota information is loaded. 1965884d179dSJan Kara */ 1966884d179dSJan Kara static int vfs_load_quota_inode(struct inode *inode, int type, int format_id, 1967884d179dSJan Kara unsigned int flags) 1968884d179dSJan Kara { 1969884d179dSJan Kara struct quota_format_type *fmt = find_quota_format(format_id); 1970884d179dSJan Kara struct super_block *sb = inode->i_sb; 1971884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 1972884d179dSJan Kara int error; 1973884d179dSJan Kara int oldflags = -1; 1974884d179dSJan Kara 1975884d179dSJan Kara if (!fmt) 1976884d179dSJan Kara return -ESRCH; 1977884d179dSJan Kara if (!S_ISREG(inode->i_mode)) { 1978884d179dSJan Kara error = -EACCES; 1979884d179dSJan Kara goto out_fmt; 1980884d179dSJan Kara } 1981884d179dSJan Kara if (IS_RDONLY(inode)) { 1982884d179dSJan Kara error = -EROFS; 1983884d179dSJan Kara goto out_fmt; 1984884d179dSJan Kara } 1985884d179dSJan Kara if (!sb->s_op->quota_write || !sb->s_op->quota_read) { 1986884d179dSJan Kara error = -EINVAL; 1987884d179dSJan Kara goto out_fmt; 1988884d179dSJan Kara } 1989884d179dSJan Kara /* Usage always has to be set... */ 1990884d179dSJan Kara if (!(flags & DQUOT_USAGE_ENABLED)) { 1991884d179dSJan Kara error = -EINVAL; 1992884d179dSJan Kara goto out_fmt; 1993884d179dSJan Kara } 1994884d179dSJan Kara 1995884d179dSJan Kara if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) { 1996884d179dSJan Kara /* As we bypass the pagecache we must now flush the inode so 1997884d179dSJan Kara * that we see all the changes from userspace... */ 1998884d179dSJan Kara write_inode_now(inode, 1); 1999884d179dSJan Kara /* And now flush the block cache so that kernel sees the 2000884d179dSJan Kara * changes */ 2001884d179dSJan Kara invalidate_bdev(sb->s_bdev); 2002884d179dSJan Kara } 2003884d179dSJan Kara mutex_lock(&dqopt->dqonoff_mutex); 2004884d179dSJan Kara if (sb_has_quota_loaded(sb, type)) { 2005884d179dSJan Kara error = -EBUSY; 2006884d179dSJan Kara goto out_lock; 2007884d179dSJan Kara } 2008884d179dSJan Kara 2009884d179dSJan Kara if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) { 2010884d179dSJan Kara /* We don't want quota and atime on quota files (deadlocks 2011884d179dSJan Kara * possible) Also nobody should write to the file - we use 2012884d179dSJan Kara * special IO operations which ignore the immutable bit. */ 2013884d179dSJan Kara down_write(&dqopt->dqptr_sem); 2014dee86565SJan Kara mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA); 2015268157baSJan Kara oldflags = inode->i_flags & (S_NOATIME | S_IMMUTABLE | 2016268157baSJan Kara S_NOQUOTA); 2017884d179dSJan Kara inode->i_flags |= S_NOQUOTA | S_NOATIME | S_IMMUTABLE; 2018dee86565SJan Kara mutex_unlock(&inode->i_mutex); 2019884d179dSJan Kara up_write(&dqopt->dqptr_sem); 2020884d179dSJan Kara sb->dq_op->drop(inode); 2021884d179dSJan Kara } 2022884d179dSJan Kara 2023884d179dSJan Kara error = -EIO; 2024884d179dSJan Kara dqopt->files[type] = igrab(inode); 2025884d179dSJan Kara if (!dqopt->files[type]) 2026884d179dSJan Kara goto out_lock; 2027884d179dSJan Kara error = -EINVAL; 2028884d179dSJan Kara if (!fmt->qf_ops->check_quota_file(sb, type)) 2029884d179dSJan Kara goto out_file_init; 2030884d179dSJan Kara 2031884d179dSJan Kara dqopt->ops[type] = fmt->qf_ops; 2032884d179dSJan Kara dqopt->info[type].dqi_format = fmt; 2033884d179dSJan Kara dqopt->info[type].dqi_fmt_id = format_id; 2034884d179dSJan Kara INIT_LIST_HEAD(&dqopt->info[type].dqi_dirty_list); 2035884d179dSJan Kara mutex_lock(&dqopt->dqio_mutex); 2036268157baSJan Kara error = dqopt->ops[type]->read_file_info(sb, type); 2037268157baSJan Kara if (error < 0) { 2038884d179dSJan Kara mutex_unlock(&dqopt->dqio_mutex); 2039884d179dSJan Kara goto out_file_init; 2040884d179dSJan Kara } 2041884d179dSJan Kara mutex_unlock(&dqopt->dqio_mutex); 2042884d179dSJan Kara spin_lock(&dq_state_lock); 2043884d179dSJan Kara dqopt->flags |= dquot_state_flag(flags, type); 2044884d179dSJan Kara spin_unlock(&dq_state_lock); 2045884d179dSJan Kara 2046884d179dSJan Kara add_dquot_ref(sb, type); 2047884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 2048884d179dSJan Kara 2049884d179dSJan Kara return 0; 2050884d179dSJan Kara 2051884d179dSJan Kara out_file_init: 2052884d179dSJan Kara dqopt->files[type] = NULL; 2053884d179dSJan Kara iput(inode); 2054884d179dSJan Kara out_lock: 2055884d179dSJan Kara if (oldflags != -1) { 2056884d179dSJan Kara down_write(&dqopt->dqptr_sem); 2057dee86565SJan Kara mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA); 2058884d179dSJan Kara /* Set the flags back (in the case of accidental quotaon() 2059884d179dSJan Kara * on a wrong file we don't want to mess up the flags) */ 2060884d179dSJan Kara inode->i_flags &= ~(S_NOATIME | S_NOQUOTA | S_IMMUTABLE); 2061884d179dSJan Kara inode->i_flags |= oldflags; 2062dee86565SJan Kara mutex_unlock(&inode->i_mutex); 2063884d179dSJan Kara up_write(&dqopt->dqptr_sem); 2064884d179dSJan Kara } 2065d01730d7SJiaying Zhang mutex_unlock(&dqopt->dqonoff_mutex); 2066884d179dSJan Kara out_fmt: 2067884d179dSJan Kara put_quota_format(fmt); 2068884d179dSJan Kara 2069884d179dSJan Kara return error; 2070884d179dSJan Kara } 2071884d179dSJan Kara 2072884d179dSJan Kara /* Reenable quotas on remount RW */ 2073884d179dSJan Kara static int vfs_quota_on_remount(struct super_block *sb, int type) 2074884d179dSJan Kara { 2075884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 2076884d179dSJan Kara struct inode *inode; 2077884d179dSJan Kara int ret; 2078884d179dSJan Kara unsigned int flags; 2079884d179dSJan Kara 2080884d179dSJan Kara mutex_lock(&dqopt->dqonoff_mutex); 2081884d179dSJan Kara if (!sb_has_quota_suspended(sb, type)) { 2082884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 2083884d179dSJan Kara return 0; 2084884d179dSJan Kara } 2085884d179dSJan Kara inode = dqopt->files[type]; 2086884d179dSJan Kara dqopt->files[type] = NULL; 2087884d179dSJan Kara spin_lock(&dq_state_lock); 2088884d179dSJan Kara flags = dqopt->flags & dquot_state_flag(DQUOT_USAGE_ENABLED | 2089884d179dSJan Kara DQUOT_LIMITS_ENABLED, type); 2090884d179dSJan Kara dqopt->flags &= ~dquot_state_flag(DQUOT_STATE_FLAGS, type); 2091884d179dSJan Kara spin_unlock(&dq_state_lock); 2092884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 2093884d179dSJan Kara 2094884d179dSJan Kara flags = dquot_generic_flag(flags, type); 2095884d179dSJan Kara ret = vfs_load_quota_inode(inode, type, dqopt->info[type].dqi_fmt_id, 2096884d179dSJan Kara flags); 2097884d179dSJan Kara iput(inode); 2098884d179dSJan Kara 2099884d179dSJan Kara return ret; 2100884d179dSJan Kara } 2101884d179dSJan Kara 2102884d179dSJan Kara int vfs_quota_on_path(struct super_block *sb, int type, int format_id, 2103884d179dSJan Kara struct path *path) 2104884d179dSJan Kara { 2105884d179dSJan Kara int error = security_quota_on(path->dentry); 2106884d179dSJan Kara if (error) 2107884d179dSJan Kara return error; 2108884d179dSJan Kara /* Quota file not on the same filesystem? */ 2109884d179dSJan Kara if (path->mnt->mnt_sb != sb) 2110884d179dSJan Kara error = -EXDEV; 2111884d179dSJan Kara else 2112884d179dSJan Kara error = vfs_load_quota_inode(path->dentry->d_inode, type, 2113884d179dSJan Kara format_id, DQUOT_USAGE_ENABLED | 2114884d179dSJan Kara DQUOT_LIMITS_ENABLED); 2115884d179dSJan Kara return error; 2116884d179dSJan Kara } 2117884d179dSJan Kara EXPORT_SYMBOL(vfs_quota_on_path); 2118884d179dSJan Kara 2119884d179dSJan Kara int vfs_quota_on(struct super_block *sb, int type, int format_id, char *name, 2120884d179dSJan Kara int remount) 2121884d179dSJan Kara { 2122884d179dSJan Kara struct path path; 2123884d179dSJan Kara int error; 2124884d179dSJan Kara 2125884d179dSJan Kara if (remount) 2126884d179dSJan Kara return vfs_quota_on_remount(sb, type); 2127884d179dSJan Kara 2128884d179dSJan Kara error = kern_path(name, LOOKUP_FOLLOW, &path); 2129884d179dSJan Kara if (!error) { 2130884d179dSJan Kara error = vfs_quota_on_path(sb, type, format_id, &path); 2131884d179dSJan Kara path_put(&path); 2132884d179dSJan Kara } 2133884d179dSJan Kara return error; 2134884d179dSJan Kara } 2135884d179dSJan Kara EXPORT_SYMBOL(vfs_quota_on); 2136884d179dSJan Kara 2137884d179dSJan Kara /* 2138884d179dSJan Kara * More powerful function for turning on quotas allowing setting 2139884d179dSJan Kara * of individual quota flags 2140884d179dSJan Kara */ 2141884d179dSJan Kara int vfs_quota_enable(struct inode *inode, int type, int format_id, 2142884d179dSJan Kara unsigned int flags) 2143884d179dSJan Kara { 2144884d179dSJan Kara int ret = 0; 2145884d179dSJan Kara struct super_block *sb = inode->i_sb; 2146884d179dSJan Kara struct quota_info *dqopt = sb_dqopt(sb); 2147884d179dSJan Kara 2148884d179dSJan Kara /* Just unsuspend quotas? */ 2149884d179dSJan Kara if (flags & DQUOT_SUSPENDED) 2150884d179dSJan Kara return vfs_quota_on_remount(sb, type); 2151884d179dSJan Kara if (!flags) 2152884d179dSJan Kara return 0; 2153884d179dSJan Kara /* Just updating flags needed? */ 2154884d179dSJan Kara if (sb_has_quota_loaded(sb, type)) { 2155884d179dSJan Kara mutex_lock(&dqopt->dqonoff_mutex); 2156884d179dSJan Kara /* Now do a reliable test... */ 2157884d179dSJan Kara if (!sb_has_quota_loaded(sb, type)) { 2158884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 2159884d179dSJan Kara goto load_quota; 2160884d179dSJan Kara } 2161884d179dSJan Kara if (flags & DQUOT_USAGE_ENABLED && 2162884d179dSJan Kara sb_has_quota_usage_enabled(sb, type)) { 2163884d179dSJan Kara ret = -EBUSY; 2164884d179dSJan Kara goto out_lock; 2165884d179dSJan Kara } 2166884d179dSJan Kara if (flags & DQUOT_LIMITS_ENABLED && 2167884d179dSJan Kara sb_has_quota_limits_enabled(sb, type)) { 2168884d179dSJan Kara ret = -EBUSY; 2169884d179dSJan Kara goto out_lock; 2170884d179dSJan Kara } 2171884d179dSJan Kara spin_lock(&dq_state_lock); 2172884d179dSJan Kara sb_dqopt(sb)->flags |= dquot_state_flag(flags, type); 2173884d179dSJan Kara spin_unlock(&dq_state_lock); 2174884d179dSJan Kara out_lock: 2175884d179dSJan Kara mutex_unlock(&dqopt->dqonoff_mutex); 2176884d179dSJan Kara return ret; 2177884d179dSJan Kara } 2178884d179dSJan Kara 2179884d179dSJan Kara load_quota: 2180884d179dSJan Kara return vfs_load_quota_inode(inode, type, format_id, flags); 2181884d179dSJan Kara } 2182884d179dSJan Kara EXPORT_SYMBOL(vfs_quota_enable); 2183884d179dSJan Kara 2184884d179dSJan Kara /* 2185884d179dSJan Kara * This function is used when filesystem needs to initialize quotas 2186884d179dSJan Kara * during mount time. 2187884d179dSJan Kara */ 2188884d179dSJan Kara int vfs_quota_on_mount(struct super_block *sb, char *qf_name, 2189884d179dSJan Kara int format_id, int type) 2190884d179dSJan Kara { 2191884d179dSJan Kara struct dentry *dentry; 2192884d179dSJan Kara int error; 2193884d179dSJan Kara 2194c56818d7SJan Kara mutex_lock(&sb->s_root->d_inode->i_mutex); 2195884d179dSJan Kara dentry = lookup_one_len(qf_name, sb->s_root, strlen(qf_name)); 2196c56818d7SJan Kara mutex_unlock(&sb->s_root->d_inode->i_mutex); 2197884d179dSJan Kara if (IS_ERR(dentry)) 2198884d179dSJan Kara return PTR_ERR(dentry); 2199884d179dSJan Kara 2200884d179dSJan Kara if (!dentry->d_inode) { 2201884d179dSJan Kara error = -ENOENT; 2202884d179dSJan Kara goto out; 2203884d179dSJan Kara } 2204884d179dSJan Kara 2205884d179dSJan Kara error = security_quota_on(dentry); 2206884d179dSJan Kara if (!error) 2207884d179dSJan Kara error = vfs_load_quota_inode(dentry->d_inode, type, format_id, 2208884d179dSJan Kara DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); 2209884d179dSJan Kara 2210884d179dSJan Kara out: 2211884d179dSJan Kara dput(dentry); 2212884d179dSJan Kara return error; 2213884d179dSJan Kara } 2214884d179dSJan Kara EXPORT_SYMBOL(vfs_quota_on_mount); 2215884d179dSJan Kara 2216884d179dSJan Kara /* Wrapper to turn on quotas when remounting rw */ 2217884d179dSJan Kara int vfs_dq_quota_on_remount(struct super_block *sb) 2218884d179dSJan Kara { 2219884d179dSJan Kara int cnt; 2220884d179dSJan Kara int ret = 0, err; 2221884d179dSJan Kara 2222884d179dSJan Kara if (!sb->s_qcop || !sb->s_qcop->quota_on) 2223884d179dSJan Kara return -ENOSYS; 2224884d179dSJan Kara for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 2225884d179dSJan Kara err = sb->s_qcop->quota_on(sb, cnt, 0, NULL, 1); 2226884d179dSJan Kara if (err < 0 && !ret) 2227884d179dSJan Kara ret = err; 2228884d179dSJan Kara } 2229884d179dSJan Kara return ret; 2230884d179dSJan Kara } 2231884d179dSJan Kara EXPORT_SYMBOL(vfs_dq_quota_on_remount); 2232884d179dSJan Kara 2233884d179dSJan Kara static inline qsize_t qbtos(qsize_t blocks) 2234884d179dSJan Kara { 2235884d179dSJan Kara return blocks << QIF_DQBLKSIZE_BITS; 2236884d179dSJan Kara } 2237884d179dSJan Kara 2238884d179dSJan Kara static inline qsize_t stoqb(qsize_t space) 2239884d179dSJan Kara { 2240884d179dSJan Kara return (space + QIF_DQBLKSIZE - 1) >> QIF_DQBLKSIZE_BITS; 2241884d179dSJan Kara } 2242884d179dSJan Kara 2243884d179dSJan Kara /* Generic routine for getting common part of quota structure */ 2244884d179dSJan Kara static void do_get_dqblk(struct dquot *dquot, struct if_dqblk *di) 2245884d179dSJan Kara { 2246884d179dSJan Kara struct mem_dqblk *dm = &dquot->dq_dqb; 2247884d179dSJan Kara 2248884d179dSJan Kara spin_lock(&dq_data_lock); 2249884d179dSJan Kara di->dqb_bhardlimit = stoqb(dm->dqb_bhardlimit); 2250884d179dSJan Kara di->dqb_bsoftlimit = stoqb(dm->dqb_bsoftlimit); 2251884d179dSJan Kara di->dqb_curspace = dm->dqb_curspace + dm->dqb_rsvspace; 2252884d179dSJan Kara di->dqb_ihardlimit = dm->dqb_ihardlimit; 2253884d179dSJan Kara di->dqb_isoftlimit = dm->dqb_isoftlimit; 2254884d179dSJan Kara di->dqb_curinodes = dm->dqb_curinodes; 2255884d179dSJan Kara di->dqb_btime = dm->dqb_btime; 2256884d179dSJan Kara di->dqb_itime = dm->dqb_itime; 2257884d179dSJan Kara di->dqb_valid = QIF_ALL; 2258884d179dSJan Kara spin_unlock(&dq_data_lock); 2259884d179dSJan Kara } 2260884d179dSJan Kara 2261268157baSJan Kara int vfs_get_dqblk(struct super_block *sb, int type, qid_t id, 2262268157baSJan Kara struct if_dqblk *di) 2263884d179dSJan Kara { 2264884d179dSJan Kara struct dquot *dquot; 2265884d179dSJan Kara 2266884d179dSJan Kara dquot = dqget(sb, id, type); 2267dd6f3c6dSJan Kara if (!dquot) 2268884d179dSJan Kara return -ESRCH; 2269884d179dSJan Kara do_get_dqblk(dquot, di); 2270884d179dSJan Kara dqput(dquot); 2271884d179dSJan Kara 2272884d179dSJan Kara return 0; 2273884d179dSJan Kara } 2274884d179dSJan Kara EXPORT_SYMBOL(vfs_get_dqblk); 2275884d179dSJan Kara 2276884d179dSJan Kara /* Generic routine for setting common part of quota structure */ 2277884d179dSJan Kara static int do_set_dqblk(struct dquot *dquot, struct if_dqblk *di) 2278884d179dSJan Kara { 2279884d179dSJan Kara struct mem_dqblk *dm = &dquot->dq_dqb; 2280884d179dSJan Kara int check_blim = 0, check_ilim = 0; 2281884d179dSJan Kara struct mem_dqinfo *dqi = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_type]; 2282884d179dSJan Kara 2283884d179dSJan Kara if ((di->dqb_valid & QIF_BLIMITS && 2284884d179dSJan Kara (di->dqb_bhardlimit > dqi->dqi_maxblimit || 2285884d179dSJan Kara di->dqb_bsoftlimit > dqi->dqi_maxblimit)) || 2286884d179dSJan Kara (di->dqb_valid & QIF_ILIMITS && 2287884d179dSJan Kara (di->dqb_ihardlimit > dqi->dqi_maxilimit || 2288884d179dSJan Kara di->dqb_isoftlimit > dqi->dqi_maxilimit))) 2289884d179dSJan Kara return -ERANGE; 2290884d179dSJan Kara 2291884d179dSJan Kara spin_lock(&dq_data_lock); 2292884d179dSJan Kara if (di->dqb_valid & QIF_SPACE) { 2293884d179dSJan Kara dm->dqb_curspace = di->dqb_curspace - dm->dqb_rsvspace; 2294884d179dSJan Kara check_blim = 1; 2295884d179dSJan Kara __set_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags); 2296884d179dSJan Kara } 2297884d179dSJan Kara if (di->dqb_valid & QIF_BLIMITS) { 2298884d179dSJan Kara dm->dqb_bsoftlimit = qbtos(di->dqb_bsoftlimit); 2299884d179dSJan Kara dm->dqb_bhardlimit = qbtos(di->dqb_bhardlimit); 2300884d179dSJan Kara check_blim = 1; 2301884d179dSJan Kara __set_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags); 2302884d179dSJan Kara } 2303884d179dSJan Kara if (di->dqb_valid & QIF_INODES) { 2304884d179dSJan Kara dm->dqb_curinodes = di->dqb_curinodes; 2305884d179dSJan Kara check_ilim = 1; 2306884d179dSJan Kara __set_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags); 2307884d179dSJan Kara } 2308884d179dSJan Kara if (di->dqb_valid & QIF_ILIMITS) { 2309884d179dSJan Kara dm->dqb_isoftlimit = di->dqb_isoftlimit; 2310884d179dSJan Kara dm->dqb_ihardlimit = di->dqb_ihardlimit; 2311884d179dSJan Kara check_ilim = 1; 2312884d179dSJan Kara __set_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags); 2313884d179dSJan Kara } 2314884d179dSJan Kara if (di->dqb_valid & QIF_BTIME) { 2315884d179dSJan Kara dm->dqb_btime = di->dqb_btime; 2316884d179dSJan Kara check_blim = 1; 2317884d179dSJan Kara __set_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags); 2318884d179dSJan Kara } 2319884d179dSJan Kara if (di->dqb_valid & QIF_ITIME) { 2320884d179dSJan Kara dm->dqb_itime = di->dqb_itime; 2321884d179dSJan Kara check_ilim = 1; 2322884d179dSJan Kara __set_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags); 2323884d179dSJan Kara } 2324884d179dSJan Kara 2325884d179dSJan Kara if (check_blim) { 2326268157baSJan Kara if (!dm->dqb_bsoftlimit || 2327268157baSJan Kara dm->dqb_curspace < dm->dqb_bsoftlimit) { 2328884d179dSJan Kara dm->dqb_btime = 0; 2329884d179dSJan Kara clear_bit(DQ_BLKS_B, &dquot->dq_flags); 2330268157baSJan Kara } else if (!(di->dqb_valid & QIF_BTIME)) 2331268157baSJan Kara /* Set grace only if user hasn't provided his own... */ 2332884d179dSJan Kara dm->dqb_btime = get_seconds() + dqi->dqi_bgrace; 2333884d179dSJan Kara } 2334884d179dSJan Kara if (check_ilim) { 2335268157baSJan Kara if (!dm->dqb_isoftlimit || 2336268157baSJan Kara dm->dqb_curinodes < dm->dqb_isoftlimit) { 2337884d179dSJan Kara dm->dqb_itime = 0; 2338884d179dSJan Kara clear_bit(DQ_INODES_B, &dquot->dq_flags); 2339268157baSJan Kara } else if (!(di->dqb_valid & QIF_ITIME)) 2340268157baSJan Kara /* Set grace only if user hasn't provided his own... */ 2341884d179dSJan Kara dm->dqb_itime = get_seconds() + dqi->dqi_igrace; 2342884d179dSJan Kara } 2343268157baSJan Kara if (dm->dqb_bhardlimit || dm->dqb_bsoftlimit || dm->dqb_ihardlimit || 2344268157baSJan Kara dm->dqb_isoftlimit) 2345884d179dSJan Kara clear_bit(DQ_FAKE_B, &dquot->dq_flags); 2346884d179dSJan Kara else 2347884d179dSJan Kara set_bit(DQ_FAKE_B, &dquot->dq_flags); 2348884d179dSJan Kara spin_unlock(&dq_data_lock); 2349884d179dSJan Kara mark_dquot_dirty(dquot); 2350884d179dSJan Kara 2351884d179dSJan Kara return 0; 2352884d179dSJan Kara } 2353884d179dSJan Kara 2354268157baSJan Kara int vfs_set_dqblk(struct super_block *sb, int type, qid_t id, 2355268157baSJan Kara struct if_dqblk *di) 2356884d179dSJan Kara { 2357884d179dSJan Kara struct dquot *dquot; 2358884d179dSJan Kara int rc; 2359884d179dSJan Kara 2360884d179dSJan Kara dquot = dqget(sb, id, type); 2361884d179dSJan Kara if (!dquot) { 2362884d179dSJan Kara rc = -ESRCH; 2363884d179dSJan Kara goto out; 2364884d179dSJan Kara } 2365884d179dSJan Kara rc = do_set_dqblk(dquot, di); 2366884d179dSJan Kara dqput(dquot); 2367884d179dSJan Kara out: 2368884d179dSJan Kara return rc; 2369884d179dSJan Kara } 2370884d179dSJan Kara EXPORT_SYMBOL(vfs_set_dqblk); 2371884d179dSJan Kara 2372884d179dSJan Kara /* Generic routine for getting common part of quota file information */ 2373884d179dSJan Kara int vfs_get_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii) 2374884d179dSJan Kara { 2375884d179dSJan Kara struct mem_dqinfo *mi; 2376884d179dSJan Kara 2377884d179dSJan Kara mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); 2378884d179dSJan Kara if (!sb_has_quota_active(sb, type)) { 2379884d179dSJan Kara mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); 2380884d179dSJan Kara return -ESRCH; 2381884d179dSJan Kara } 2382884d179dSJan Kara mi = sb_dqopt(sb)->info + type; 2383884d179dSJan Kara spin_lock(&dq_data_lock); 2384884d179dSJan Kara ii->dqi_bgrace = mi->dqi_bgrace; 2385884d179dSJan Kara ii->dqi_igrace = mi->dqi_igrace; 2386884d179dSJan Kara ii->dqi_flags = mi->dqi_flags & DQF_MASK; 2387884d179dSJan Kara ii->dqi_valid = IIF_ALL; 2388884d179dSJan Kara spin_unlock(&dq_data_lock); 2389884d179dSJan Kara mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); 2390884d179dSJan Kara return 0; 2391884d179dSJan Kara } 2392884d179dSJan Kara EXPORT_SYMBOL(vfs_get_dqinfo); 2393884d179dSJan Kara 2394884d179dSJan Kara /* Generic routine for setting common part of quota file information */ 2395884d179dSJan Kara int vfs_set_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii) 2396884d179dSJan Kara { 2397884d179dSJan Kara struct mem_dqinfo *mi; 2398884d179dSJan Kara int err = 0; 2399884d179dSJan Kara 2400884d179dSJan Kara mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); 2401884d179dSJan Kara if (!sb_has_quota_active(sb, type)) { 2402884d179dSJan Kara err = -ESRCH; 2403884d179dSJan Kara goto out; 2404884d179dSJan Kara } 2405884d179dSJan Kara mi = sb_dqopt(sb)->info + type; 2406884d179dSJan Kara spin_lock(&dq_data_lock); 2407884d179dSJan Kara if (ii->dqi_valid & IIF_BGRACE) 2408884d179dSJan Kara mi->dqi_bgrace = ii->dqi_bgrace; 2409884d179dSJan Kara if (ii->dqi_valid & IIF_IGRACE) 2410884d179dSJan Kara mi->dqi_igrace = ii->dqi_igrace; 2411884d179dSJan Kara if (ii->dqi_valid & IIF_FLAGS) 2412268157baSJan Kara mi->dqi_flags = (mi->dqi_flags & ~DQF_MASK) | 2413268157baSJan Kara (ii->dqi_flags & DQF_MASK); 2414884d179dSJan Kara spin_unlock(&dq_data_lock); 2415884d179dSJan Kara mark_info_dirty(sb, type); 2416884d179dSJan Kara /* Force write to disk */ 2417884d179dSJan Kara sb->dq_op->write_info(sb, type); 2418884d179dSJan Kara out: 2419884d179dSJan Kara mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); 2420884d179dSJan Kara return err; 2421884d179dSJan Kara } 2422884d179dSJan Kara EXPORT_SYMBOL(vfs_set_dqinfo); 2423884d179dSJan Kara 24240d54b217SAlexey Dobriyan const struct quotactl_ops vfs_quotactl_ops = { 2425884d179dSJan Kara .quota_on = vfs_quota_on, 2426884d179dSJan Kara .quota_off = vfs_quota_off, 2427884d179dSJan Kara .quota_sync = vfs_quota_sync, 2428884d179dSJan Kara .get_info = vfs_get_dqinfo, 2429884d179dSJan Kara .set_info = vfs_set_dqinfo, 2430884d179dSJan Kara .get_dqblk = vfs_get_dqblk, 2431884d179dSJan Kara .set_dqblk = vfs_set_dqblk 2432884d179dSJan Kara }; 2433884d179dSJan Kara 2434884d179dSJan Kara static ctl_table fs_dqstats_table[] = { 2435884d179dSJan Kara { 2436884d179dSJan Kara .procname = "lookups", 2437884d179dSJan Kara .data = &dqstats.lookups, 2438884d179dSJan Kara .maxlen = sizeof(int), 2439884d179dSJan Kara .mode = 0444, 24406d456111SEric W. Biederman .proc_handler = proc_dointvec, 2441884d179dSJan Kara }, 2442884d179dSJan Kara { 2443884d179dSJan Kara .procname = "drops", 2444884d179dSJan Kara .data = &dqstats.drops, 2445884d179dSJan Kara .maxlen = sizeof(int), 2446884d179dSJan Kara .mode = 0444, 24476d456111SEric W. Biederman .proc_handler = proc_dointvec, 2448884d179dSJan Kara }, 2449884d179dSJan Kara { 2450884d179dSJan Kara .procname = "reads", 2451884d179dSJan Kara .data = &dqstats.reads, 2452884d179dSJan Kara .maxlen = sizeof(int), 2453884d179dSJan Kara .mode = 0444, 24546d456111SEric W. Biederman .proc_handler = proc_dointvec, 2455884d179dSJan Kara }, 2456884d179dSJan Kara { 2457884d179dSJan Kara .procname = "writes", 2458884d179dSJan Kara .data = &dqstats.writes, 2459884d179dSJan Kara .maxlen = sizeof(int), 2460884d179dSJan Kara .mode = 0444, 24616d456111SEric W. Biederman .proc_handler = proc_dointvec, 2462884d179dSJan Kara }, 2463884d179dSJan Kara { 2464884d179dSJan Kara .procname = "cache_hits", 2465884d179dSJan Kara .data = &dqstats.cache_hits, 2466884d179dSJan Kara .maxlen = sizeof(int), 2467884d179dSJan Kara .mode = 0444, 24686d456111SEric W. Biederman .proc_handler = proc_dointvec, 2469884d179dSJan Kara }, 2470884d179dSJan Kara { 2471884d179dSJan Kara .procname = "allocated_dquots", 2472884d179dSJan Kara .data = &dqstats.allocated_dquots, 2473884d179dSJan Kara .maxlen = sizeof(int), 2474884d179dSJan Kara .mode = 0444, 24756d456111SEric W. Biederman .proc_handler = proc_dointvec, 2476884d179dSJan Kara }, 2477884d179dSJan Kara { 2478884d179dSJan Kara .procname = "free_dquots", 2479884d179dSJan Kara .data = &dqstats.free_dquots, 2480884d179dSJan Kara .maxlen = sizeof(int), 2481884d179dSJan Kara .mode = 0444, 24826d456111SEric W. Biederman .proc_handler = proc_dointvec, 2483884d179dSJan Kara }, 2484884d179dSJan Kara { 2485884d179dSJan Kara .procname = "syncs", 2486884d179dSJan Kara .data = &dqstats.syncs, 2487884d179dSJan Kara .maxlen = sizeof(int), 2488884d179dSJan Kara .mode = 0444, 24896d456111SEric W. Biederman .proc_handler = proc_dointvec, 2490884d179dSJan Kara }, 2491884d179dSJan Kara #ifdef CONFIG_PRINT_QUOTA_WARNING 2492884d179dSJan Kara { 2493884d179dSJan Kara .procname = "warnings", 2494884d179dSJan Kara .data = &flag_print_warnings, 2495884d179dSJan Kara .maxlen = sizeof(int), 2496884d179dSJan Kara .mode = 0644, 24976d456111SEric W. Biederman .proc_handler = proc_dointvec, 2498884d179dSJan Kara }, 2499884d179dSJan Kara #endif 2500ab09203eSEric W. Biederman { }, 2501884d179dSJan Kara }; 2502884d179dSJan Kara 2503884d179dSJan Kara static ctl_table fs_table[] = { 2504884d179dSJan Kara { 2505884d179dSJan Kara .procname = "quota", 2506884d179dSJan Kara .mode = 0555, 2507884d179dSJan Kara .child = fs_dqstats_table, 2508884d179dSJan Kara }, 2509ab09203eSEric W. Biederman { }, 2510884d179dSJan Kara }; 2511884d179dSJan Kara 2512884d179dSJan Kara static ctl_table sys_table[] = { 2513884d179dSJan Kara { 2514884d179dSJan Kara .procname = "fs", 2515884d179dSJan Kara .mode = 0555, 2516884d179dSJan Kara .child = fs_table, 2517884d179dSJan Kara }, 2518ab09203eSEric W. Biederman { }, 2519884d179dSJan Kara }; 2520884d179dSJan Kara 2521884d179dSJan Kara static int __init dquot_init(void) 2522884d179dSJan Kara { 2523884d179dSJan Kara int i; 2524884d179dSJan Kara unsigned long nr_hash, order; 2525884d179dSJan Kara 2526884d179dSJan Kara printk(KERN_NOTICE "VFS: Disk quotas %s\n", __DQUOT_VERSION__); 2527884d179dSJan Kara 2528884d179dSJan Kara register_sysctl_table(sys_table); 2529884d179dSJan Kara 2530884d179dSJan Kara dquot_cachep = kmem_cache_create("dquot", 2531884d179dSJan Kara sizeof(struct dquot), sizeof(unsigned long) * 4, 2532884d179dSJan Kara (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| 2533884d179dSJan Kara SLAB_MEM_SPREAD|SLAB_PANIC), 2534884d179dSJan Kara NULL); 2535884d179dSJan Kara 2536884d179dSJan Kara order = 0; 2537884d179dSJan Kara dquot_hash = (struct hlist_head *)__get_free_pages(GFP_ATOMIC, order); 2538884d179dSJan Kara if (!dquot_hash) 2539884d179dSJan Kara panic("Cannot create dquot hash table"); 2540884d179dSJan Kara 2541884d179dSJan Kara /* Find power-of-two hlist_heads which can fit into allocation */ 2542884d179dSJan Kara nr_hash = (1UL << order) * PAGE_SIZE / sizeof(struct hlist_head); 2543884d179dSJan Kara dq_hash_bits = 0; 2544884d179dSJan Kara do { 2545884d179dSJan Kara dq_hash_bits++; 2546884d179dSJan Kara } while (nr_hash >> dq_hash_bits); 2547884d179dSJan Kara dq_hash_bits--; 2548884d179dSJan Kara 2549884d179dSJan Kara nr_hash = 1UL << dq_hash_bits; 2550884d179dSJan Kara dq_hash_mask = nr_hash - 1; 2551884d179dSJan Kara for (i = 0; i < nr_hash; i++) 2552884d179dSJan Kara INIT_HLIST_HEAD(dquot_hash + i); 2553884d179dSJan Kara 2554884d179dSJan Kara printk("Dquot-cache hash table entries: %ld (order %ld, %ld bytes)\n", 2555884d179dSJan Kara nr_hash, order, (PAGE_SIZE << order)); 2556884d179dSJan Kara 2557884d179dSJan Kara register_shrinker(&dqcache_shrinker); 2558884d179dSJan Kara 2559884d179dSJan Kara return 0; 2560884d179dSJan Kara } 2561884d179dSJan Kara module_init(dquot_init); 2562