cregit-Linux how code gets into the kernel

Release 4.18 fs/quota/dquot.c

Directory: fs/quota
// SPDX-License-Identifier: GPL-2.0
/*
 * Implementation of the diskquota system for the LINUX operating system. QUOTA
 * is implemented using the BSD system call interface as the means of
 * communication with the user level. This file contains the generic routines
 * called by the different filesystems on allocation of an inode or block.
 * These routines take care of the administration needed to have a consistent
 * diskquota tracking system. The ideas of both user and group quotas are based
 * on the Melbourne quota system as used on BSD derived systems. The internal
 * implementation is based on one of the several variants of the LINUX
 * inode-subsystem with added complexity of the diskquota system.
 * 
 * Author:      Marco van Wieringen <mvw@planets.elm.net>
 *
 * Fixes:   Dmitry Gorodchanin <pgmdsg@ibi.com>, 11 Feb 96
 *
 *              Revised list management to avoid races
 *              -- Bill Hawes, <whawes@star.net>, 9/98
 *
 *              Fixed races in dquot_transfer(), dqget() and dquot_alloc_...().
 *              As the consequence the locking was moved from dquot_decr_...(),
 *              dquot_incr_...() to calling functions.
 *              invalidate_dquots() now writes modified dquots.
 *              Serialized quota_off() and quota_on() for mount point.
 *              Fixed a few bugs in grow_dquots().
 *              Fixed deadlock in write_dquot() - we no longer account quotas on
 *              quota files
 *              remove_dquot_ref() moved to inode.c - it now traverses through inodes
 *              add_dquot_ref() restarts after blocking
 *              Added check for bogus uid and fixed check for group in quotactl.
 *              Jan Kara, <jack@suse.cz>, sponsored by SuSE CR, 10-11/99
 *
 *              Used struct list_head instead of own list struct
 *              Invalidation of referenced dquots is no longer possible
 *              Improved free_dquots list management
 *              Quota and i_blocks are now updated in one place to avoid races
 *              Warnings are now delayed so we won't block in critical section
 *              Write updated not to require dquot lock
 *              Jan Kara, <jack@suse.cz>, 9/2000
 *
 *              Added dynamic quota structure allocation
 *              Jan Kara <jack@suse.cz> 12/2000
 *
 *              Rewritten quota interface. Implemented new quota format and
 *              formats registering.
 *              Jan Kara, <jack@suse.cz>, 2001,2002
 *
 *              New SMP locking.
 *              Jan Kara, <jack@suse.cz>, 10/2002
 *
 *              Added journalled quota support, fix lock inversion problems
 *              Jan Kara, <jack@suse.cz>, 2003,2004
 *
 * (C) Copyright 1994 - 1997 Marco van Wieringen 
 */

#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/mount.h>
#include <linux/mm.h>
#include <linux/time.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/fcntl.h>
#include <linux/stat.h>
#include <linux/tty.h>
#include <linux/file.h>
#include <linux/slab.h>
#include <linux/sysctl.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/proc_fs.h>
#include <linux/security.h>
#include <linux/sched.h>
#include <linux/cred.h>
#include <linux/kmod.h>
#include <linux/namei.h>
#include <linux/capability.h>
#include <linux/quotaops.h>
#include "../internal.h" /* ugh */

#include <linux/uaccess.h>

/*
 * There are five quota SMP locks:
 * * dq_list_lock protects all lists with quotas and quota formats.
 * * dquot->dq_dqb_lock protects data from dq_dqb
 * * inode->i_lock protects inode->i_blocks, i_bytes and also guards
 *   consistency of dquot->dq_dqb with inode->i_blocks, i_bytes so that
 *   dquot_transfer() can stabilize amount it transfers
 * * dq_data_lock protects mem_dqinfo structures and modifications of dquot
 *   pointers in the inode
 * * dq_state_lock protects modifications of quota state (on quotaon and
 *   quotaoff) and readers who care about latest values take it as well.
 *
 * The spinlock ordering is hence:
 *   dq_data_lock > dq_list_lock > i_lock > dquot->dq_dqb_lock,
 *   dq_list_lock > dq_state_lock
 *
 * Note that some things (eg. sb pointer, type, id) doesn't change during
 * the life of the dquot structure and so needn't to be protected by a lock
 *
 * Operation accessing dquots via inode pointers are protected by dquot_srcu.
 * Operation of reading pointer needs srcu_read_lock(&dquot_srcu), and
 * synchronize_srcu(&dquot_srcu) is called after clearing pointers from
 * inode and before dropping dquot references to avoid use of dquots after
 * they are freed. dq_data_lock is used to serialize the pointer setting and
 * clearing operations.
 * Special care needs to be taken about S_NOQUOTA inode flag (marking that
 * inode is a quota file). Functions adding pointers from inode to dquots have
 * to check this flag under dq_data_lock and then (if S_NOQUOTA is not set) they
 * have to do all pointer modifications before dropping dq_data_lock. This makes
 * sure they cannot race with quotaon which first sets S_NOQUOTA flag and
 * then drops all pointers to dquots from an inode.
 *
 * Each dquot has its dq_lock mutex.  Dquot is locked when it is being read to
 * memory (or space for it is being allocated) on the first dqget(), when it is
 * being written out, and when it is being released on the last dqput(). The
 * allocation and release operations are serialized by the dq_lock and by
 * checking the use count in dquot_release().
 *
 * Lock ordering (including related VFS locks) is the following:
 *   s_umount > i_mutex > journal_lock > dquot->dq_lock > dqio_sem
 */

static __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_list_lock);
static __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_state_lock);
__cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_data_lock);
EXPORT_SYMBOL(dq_data_lock);
DEFINE_STATIC_SRCU(dquot_srcu);

static DECLARE_WAIT_QUEUE_HEAD(dquot_ref_wq);


void __quota_error(struct super_block *sb, const char *func, const char *fmt, ...) { if (printk_ratelimit()) { va_list args; struct va_format vaf; va_start(args, fmt); vaf.fmt = fmt; vaf.va = &args; printk(KERN_ERR "Quota error (device %s): %s: %pV\n", sb->s_id, func, &vaf); va_end(args); } }

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Jiaying Zhang5369.74%150.00%
Joe Perches2330.26%150.00%
Total76100.00%2100.00%

EXPORT_SYMBOL(__quota_error); #if defined(CONFIG_QUOTA_DEBUG) || defined(CONFIG_PRINT_QUOTA_WARNING) static char *quotatypes[] = INITQFNAMES; #endif static struct quota_format_type *quota_formats; /* List of registered formats */ static struct quota_module_name module_names[] = INIT_QUOTA_MODULE_NAMES; /* SLAB cache for dquot structures */ static struct kmem_cache *dquot_cachep;
int register_quota_format(struct quota_format_type *fmt) { spin_lock(&dq_list_lock); fmt->qf_next = quota_formats; quota_formats = fmt; spin_unlock(&dq_list_lock); return 0; }

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Jan Kara1954.29%133.33%
Andrew Morton1028.57%133.33%
Linus Torvalds (pre-git)617.14%133.33%
Total35100.00%3100.00%

EXPORT_SYMBOL(register_quota_format);
void unregister_quota_format(struct quota_format_type *fmt) { struct quota_format_type **actqf; spin_lock(&dq_list_lock); for (actqf = &quota_formats; *actqf && *actqf != fmt; actqf = &(*actqf)->qf_next) ; if (*actqf) *actqf = (*actqf)->qf_next; spin_unlock(&dq_list_lock); }

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Jan Kara5782.61%133.33%
Andrew Morton1014.49%133.33%
Linus Torvalds (pre-git)22.90%133.33%
Total69100.00%3100.00%

EXPORT_SYMBOL(unregister_quota_format);
static struct quota_format_type *find_quota_format(int id) { struct quota_format_type *actqf; spin_lock(&dq_list_lock); for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id; actqf = actqf->qf_next) ; if (!actqf || !try_module_get(actqf->qf_owner)) { int qm; spin_unlock(&dq_list_lock); for (qm = 0; module_names[qm].qm_fmt_id && module_names[qm].qm_fmt_id != id; qm++) ; if (!module_names[qm].qm_fmt_id || request_module(module_names[qm].qm_mod_name)) return NULL; spin_lock(&dq_list_lock); for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id; actqf = actqf->qf_next) ; if (actqf && !try_module_get(actqf->qf_owner)) actqf = NULL; } spin_unlock(&dq_list_lock); return actqf; }

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Andrew Morton9757.74%225.00%
Jan Kara6639.29%337.50%
Christoph Hellwig31.79%225.00%
Linus Torvalds (pre-git)21.19%112.50%
Total168100.00%8100.00%


static void put_quota_format(struct quota_format_type *fmt) { module_put(fmt->qf_owner); }

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Jan Kara1794.44%150.00%
Christoph Hellwig15.56%150.00%
Total18100.00%2100.00%

/* * Dquot List Management: * The quota code uses three lists for dquot management: the inuse_list, * free_dquots, and dquot_hash[] array. A single dquot structure may be * on all three lists, depending on its current state. * * All dquots are placed to the end of inuse_list when first created, and this * list is used for invalidate operation, which must look at every dquot. * * Unused dquots (dq_count == 0) are added to the free_dquots list when freed, * and this list is searched whenever we need an available dquot. Dquots are * removed from the list as soon as they are used again, and * dqstats.free_dquots gives the number of dquots on the list. When * dquot is invalidated it's completely released from memory. * * Dquots with a specific identity (device, type and id) are placed on * one of the dquot_hash[] hash chains. The provides an efficient search * mechanism to locate a specific dquot. */ static LIST_HEAD(inuse_list); static LIST_HEAD(free_dquots); static unsigned int dq_hash_bits, dq_hash_mask; static struct hlist_head *dquot_hash; struct dqstats dqstats; EXPORT_SYMBOL(dqstats); static qsize_t inode_get_rsv_space(struct inode *inode); static qsize_t __inode_get_rsv_space(struct inode *inode); static int __dquot_initialize(struct inode *inode, int type);
static inline unsigned int hashfn(const struct super_block *sb, struct kqid qid) { unsigned int id = from_kqid(&init_user_ns, qid); int type = qid.type; unsigned long tmp; tmp = (((unsigned long)sb>>L1_CACHE_SHIFT) ^ id) * (MAXQUOTAS - type); return (tmp + (tmp >> dq_hash_bits)) & dq_hash_mask; }

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Linus Torvalds (pre-git)2330.26%225.00%
Eric W. Biedermann1925.00%112.50%
Andrew Morton1418.42%112.50%
Al Viro810.53%112.50%
Mika Kukkonen67.89%112.50%
Linus Torvalds56.58%112.50%
Jan Kara11.32%112.50%
Total76100.00%8100.00%

/* * Following list functions expect dq_list_lock to be held */
static inline void insert_dquot_hash(struct dquot *dquot) { struct hlist_head *head; head = dquot_hash + hashfn(dquot->dq_sb, dquot->dq_id); hlist_add_head(&dquot->dq_hash, head); }

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Linus Torvalds (pre-git)2969.05%233.33%
Linus Torvalds716.67%233.33%
Jan Kara49.52%116.67%
Andrew Morton24.76%116.67%
Total42100.00%6100.00%


static inline void remove_dquot_hash(struct dquot *dquot) { hlist_del_init(&dquot->dq_hash); }

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Linus Torvalds (pre-git)1470.00%250.00%
Linus Torvalds525.00%125.00%
Andrew Morton15.00%125.00%
Total20100.00%4100.00%


static struct dquot *find_dquot(unsigned int hashent, struct super_block *sb, struct kqid qid) { struct hlist_node *node; struct dquot *dquot; hlist_for_each (node, dquot_hash+hashent) { dquot = hlist_entry(node, struct dquot, dq_hash); if (dquot->dq_sb == sb && qid_eq(dquot->dq_id, qid)) return dquot; } return NULL; }

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Linus Torvalds (pre-git)3344.59%228.57%
Linus Torvalds2331.08%228.57%
Andrew Morton1013.51%114.29%
Eric W. Biedermann79.46%114.29%
Jan Kara11.35%114.29%
Total74100.00%7100.00%

/* Add a dquot to the tail of the free list */
static inline void put_dquot_last(struct dquot *dquot) { list_add_tail(&dquot->dq_free, &free_dquots); dqstats_inc(DQST_FREE_DQUOTS); }

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Linus Torvalds (pre-git)2278.57%360.00%
Dmitriy Monakhov414.29%120.00%
Akinobu Mita27.14%120.00%
Total28100.00%5100.00%


static inline void remove_free_dquot(struct dquot *dquot) { if (list_empty(&dquot->dq_free)) return; list_del_init(&dquot->dq_free); dqstats_dec(DQST_FREE_DQUOTS); }

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Linus Torvalds (pre-git)3186.11%466.67%
Dmitriy Monakhov411.11%116.67%
Dave Jones12.78%116.67%
Total36100.00%6100.00%


static inline void put_inuse(struct dquot *dquot) { /* We add to the back of inuse list so we don't have to restart * when traversing this list and we block */ list_add_tail(&dquot->dq_inuse, &inuse_list); dqstats_inc(DQST_ALLOC_DQUOTS); }

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Linus Torvalds (pre-git)1862.07%240.00%
Linus Torvalds517.24%120.00%
Dmitriy Monakhov413.79%120.00%
Akinobu Mita26.90%120.00%
Total29100.00%5100.00%


static inline void remove_inuse(struct dquot *dquot) { dqstats_dec(DQST_ALLOC_DQUOTS); list_del(&dquot->dq_inuse); }

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Linus Torvalds2184.00%150.00%
Dmitriy Monakhov416.00%150.00%
Total25100.00%2100.00%

/* * End of list functions needing dq_list_lock */
static void wait_on_dquot(struct dquot *dquot) { mutex_lock(&dquot->dq_lock); mutex_unlock(&dquot->dq_lock); }

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Linus Torvalds (pre-git)2177.78%240.00%
Andrew Morton311.11%120.00%
Ingo Molnar27.41%120.00%
Jan Kara13.70%120.00%
Total27100.00%5100.00%


static inline int dquot_dirty(struct dquot *dquot) { return test_bit(DQ_MOD_B, &dquot->dq_flags); }

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Jan Kara23100.00%1100.00%
Total23100.00%1100.00%


static inline int mark_dquot_dirty(struct dquot *dquot) { return dquot->dq_sb->dq_op->mark_dirty(dquot); }

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Jan Kara2083.33%150.00%
Andrew Morton416.67%150.00%
Total24100.00%2100.00%

/* Mark dquot dirty in atomic manner, and return it's old dirty flag state */
int dquot_mark_dquot_dirty(struct dquot *dquot) { int ret = 1; if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) return 0; if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NOLIST_DIRTY) return test_and_set_bit(DQ_MOD_B, &dquot->dq_flags); /* If quota is dirty already, we don't have to acquire dq_list_lock */ if (test_bit(DQ_MOD_B, &dquot->dq_flags)) return 1; spin_lock(&dq_list_lock); if (!test_and_set_bit(DQ_MOD_B, &dquot->dq_flags)) { list_add(&dquot->dq_dirty, &sb_dqopt(dquot->dq_sb)-> info[dquot->dq_id.type].dqi_dirty_list); ret = 0; } spin_unlock(&dq_list_lock); return ret; }

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Andrew Morton6045.45%228.57%
Jan Kara4131.06%342.86%
Dmitriy Monakhov2821.21%114.29%
Eric W. Biedermann32.27%114.29%
Total132100.00%7100.00%

EXPORT_SYMBOL(dquot_mark_dquot_dirty); /* Dirtify all the dquots - this can block when journalling */
static inline int mark_all_dquot_dirty(struct dquot * const *dquot) { int ret, err, cnt; ret = err = 0; for (cnt = 0; cnt < MAXQUOTAS; cnt++) { if (dquot[cnt]) /* Even in case of error we have to continue */ ret = mark_dquot_dirty(dquot[cnt]); if (!err) err = ret; } return err; }

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Dmitriy Monakhov72100.00%1100.00%
Total72100.00%1100.00%


static inline void dqput_all(struct dquot **dquot) { unsigned int cnt; for (cnt = 0; cnt < MAXQUOTAS; cnt++) dqput(dquot[cnt]); }

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Dmitriy Monakhov38100.00%1100.00%
Total38100.00%1100.00%


static inline int clear_dquot_dirty(struct dquot *dquot) { if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NOLIST_DIRTY) return test_and_clear_bit(DQ_MOD_B, &dquot->dq_flags); spin_lock(&dq_list_lock); if (!test_and_clear_bit(DQ_MOD_B, &dquot->dq_flags)) { spin_unlock(&dq_list_lock); return 0; } list_del_init(&dquot->dq_dirty); spin_unlock(&dq_list_lock); return 1; }

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Jan Kara4250.60%250.00%
Andrew Morton4149.40%250.00%
Total83100.00%4100.00%


void mark_info_dirty(struct super_block *sb, int type) { spin_lock(&dq_data_lock); sb_dqopt(sb)->info[type].dqi_flags |= DQF_INFO_DIRTY; spin_unlock(&dq_data_lock); }

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Andrew Morton2871.79%150.00%
Jan Kara1128.21%150.00%
Total39100.00%2100.00%

EXPORT_SYMBOL(mark_info_dirty); /* * Read dquot from disk and alloc space for it */
int dquot_acquire(struct dquot *dquot) { int ret = 0, ret2 = 0; struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); mutex_lock(&dquot->dq_lock); if (!test_bit(DQ_READ_B, &dquot->dq_flags)) ret = dqopt->ops[dquot->dq_id.type]->read_dqblk(dquot); if (ret < 0) goto out_iolock; /* Make sure flags update is visible after dquot has been filled */ smp_mb__before_atomic(); set_bit(DQ_READ_B, &dquot->dq_flags); /* Instantiate dquot if needed */ if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && !dquot->dq_off) { ret = dqopt->ops[dquot->dq_id.type]->commit_dqblk(dquot); /* Write the info if needed */ if (info_dirty(&dqopt->info[dquot->dq_id.type])) { ret2 = dqopt->ops[dquot->dq_id.type]->write_file_info( dquot->dq_sb, dquot->dq_id.type); } if (ret < 0) goto out_iolock; if (ret2 < 0) { ret = ret2; goto out_iolock; } } /* * Make sure flags update is visible after on-disk struct has been * allocated. Paired with smp_rmb() in dqget(). */ smp_mb__before_atomic(); set_bit(DQ_ACTIVE_B, &dquot->dq_flags); out_iolock: mutex_unlock(&dquot->dq_lock); return ret; }

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Andrew Morton15266.38%323.08%
Jan Kara3113.54%323.08%
Linus Torvalds (pre-git)2611.35%430.77%
Eric W. Biedermann156.55%17.69%
Linus Torvalds31.31%17.69%
Ingo Molnar20.87%17.69%
Total229100.00%13100.00%

EXPORT_SYMBOL(dquot_acquire); /* * Write dquot to disk */
int dquot_commit(struct dquot *dquot) { int ret = 0; struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); mutex_lock(&dquot->dq_lock); if (!clear_dquot_dirty(dquot)) goto out_lock; /* Inactive dquot can be only if there was error during read/init * => we have better not writing it */ if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) ret = dqopt->ops[dquot->dq_id.type]->commit_dqblk(dquot); else ret = -EIO; out_lock: mutex_unlock(&dquot->dq_lock); return ret; }

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Andrew Morton4142.71%325.00%
Jan Kara3940.62%325.00%
Linus Torvalds (pre-git)1010.42%325.00%
Eric W. Biedermann33.12%18.33%
Ingo Molnar22.08%18.33%
Linus Torvalds11.04%18.33%
Total96100.00%12100.00%

EXPORT_SYMBOL(dquot_commit); /* * Release dquot */
int dquot_release(struct dquot *dquot) { int ret = 0, ret2 = 0; struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); mutex_lock(&dquot->dq_lock); /* Check whether we are not racing with some other dqget() */ if (atomic_read(&dquot->dq_count) > 1) goto out_dqlock; if (dqopt->ops[dquot->dq_id.type]->release_dqblk) { ret = dqopt->ops[dquot->dq_id.type]->release_dqblk(dquot); /* Write the info */ if (info_dirty(&dqopt->info[dquot->dq_id.type])) { ret2 = dqopt->ops[dquot->dq_id.type]->write_file_info( dquot->dq_sb, dquot->dq_id.type); } if (ret >= 0) ret = ret2; } clear_bit(DQ_ACTIVE_B, &dquot->dq_flags); out_dqlock: mutex_unlock(&dquot->dq_lock); return ret; }

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Andrew Morton14686.39%337.50%
Eric W. Biedermann158.88%112.50%
Jan Kara52.96%225.00%
Ingo Molnar21.18%112.50%
Linus Torvalds (pre-git)10.59%112.50%
Total169100.00%8100.00%

EXPORT_SYMBOL(dquot_release);
void dquot_destroy(struct dquot *dquot) { kmem_cache_free(dquot_cachep, dquot); }

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Jan Kara17100.00%1100.00%
Total17100.00%1100.00%

EXPORT_SYMBOL(dquot_destroy);
static inline void do_destroy_dquot(struct dquot *dquot) { dquot->dq_sb->dq_op->destroy_dquot(dquot); }

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Jan Kara23100.00%1100.00%
Total23100.00%1100.00%

/* Invalidate all dquots on the list. Note that this function is called after * quota is disabled and pointers from inodes removed so there cannot be new * quota users. There can still be some users of quotas due to inodes being * just deleted or pruned by prune_icache() (those are not attached to any * list) or parallel quotactl call. We have to wait for such users. */
static void invalidate_dquots(struct super_block *sb, int type) { struct dquot *dquot, *tmp; restart: spin_lock(&dq_list_lock); list_for_each_entry_safe(dquot, tmp, &inuse_list, dq_inuse) { if (dquot->dq_sb != sb) continue; if (dquot->dq_id.type != type) continue; /* Wait for dquot users */ if (atomic_read(&dquot->dq_count)) { dqgrab(dquot); spin_unlock(&dq_list_lock); /* * Once dqput() wakes us up, we know it's time to free * the dquot. * IMPORTANT: we rely on the fact that there is always * at most one process waiting for dquot to free. * Otherwise dq_count would be > 1 and we would never * wake up. */ wait_event(dquot_ref_wq, atomic_read(&dquot->dq_count) == 1); dqput(dquot); /* At this moment dquot() need not exist (it could be * reclaimed by prune_dqcache(). Hence we must * restart. */ goto restart; } /* * Quota now has no users and it has been written on last * dqput() */ remove_dquot_hash(dquot); remove_free_dquot(dquot); remove_inuse(dquot); do_destroy_dquot(dquot); } spin_unlock(&dq_list_lock); }

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Jan Kara6244.93%637.50%
Linus Torvalds (pre-git)3525.36%637.50%
Linus Torvalds1510.87%16.25%
Andrew Morton1410.14%16.25%
Domen Puncer96.52%16.25%
Eric W. Biedermann32.17%16.25%
Total138100.00%16100.00%

/* Call callback for every active dquot on given filesystem */
int dquot_scan_active(struct super_block *sb, int (*fn)(struct dquot *dquot, unsigned long priv), unsigned long priv) { struct dquot *dquot, *old_dquot = NULL; int ret = 0; WARN_ON_ONCE(!rwsem_is_locked(&sb->s_umount)); spin_lock(&dq_list_lock); list_for_each_entry(dquot, &inuse_list, dq_inuse) { if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) continue; if (dquot->dq_sb != sb) continue; /* Now we have active dquot so we can just increase use count */ atomic_inc(&dquot->dq_count); spin_unlock(&dq_list_lock); dqstats_inc(DQST_LOOKUPS); dqput(old_dquot); old_dquot = dquot; /* * ->release_dquot() can be racing with us. Our reference * protects us from new calls to it so just wait for any * outstanding call and recheck the DQ_ACTIVE_B after that. */ wait_on_dquot(dquot); if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { ret = fn(dquot, priv); if (ret < 0) goto out; } spin_lock(&dq_list_lock); /* We are safe to continue now because our dquot could not * be moved out of the inuse list while we hold the reference */ } spin_unlock(&dq_list_lock); out: dqput(old_dquot); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Jan Kara18197.31%375.00%
Dmitriy Monakhov52.69%125.00%
Total186100.00%4100.00%

EXPORT_SYMBOL(dquot_scan_active); /* Write all dquot structures to quota files */
int dquot_writeback_dquots(struct super_block *sb, int type) { struct list_head *dirty; struct dquot *dquot; struct quota_info *dqopt = sb_dqopt(sb); int cnt; int err, ret = 0; WARN_ON_ONCE(!rwsem_is_locked(&sb->s_umount)); for (cnt = 0; cnt < MAXQUOTAS; cnt++) { if (type != -1 && cnt != type) continue; if (!sb_has_quota_active(sb, cnt)) continue; spin_lock(&dq_list_lock); dirty = &dqopt->info[cnt].dqi_dirty_list; while (!list_empty(dirty)) { dquot = list_first_entry(dirty, struct dquot, dq_dirty); WARN_ON(!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)); /* Now we have active dquot from which someone is * holding reference so we can safely just increase * use count */ dqgrab(dquot); spin_unlock(&dq_list_lock); dqstats_inc(DQST_LOOKUPS); err = sb->dq_op->write_dquot(dquot); if (err) { /* * Clear dirty bit anyway to avoid infinite * loop here. */ clear_dquot_dirty(dquot); if (!ret) ret = err; } dqput(dquot); spin_lock(&dq_list_lock); } spin_unlock(&dq_list_lock); } for (cnt = 0; cnt < MAXQUOTAS; cnt++) if ((cnt == type || type == -1) && sb_has_quota_active(sb, cnt) && info_dirty(&dqopt->info[cnt])) sb->dq_op->write_info(sb, cnt); dqstats_inc(DQST_SYNCS); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Andrew Morton11140.22%624.00%
Jan Kara10538.04%936.00%
Linus Torvalds (pre-git)207.25%416.00%
Linus Torvalds186.52%28.00%
zhangyi (F)124.35%14.00%
Dmitriy Monakhov72.54%14.00%
Dave Jones20.72%14.00%
Pavel Emelyanov10.36%14.00%
Total276100.00%25100.00%

EXPORT_SYMBOL(dquot_writeback_dquots); /* Write all dquot structures to disk and make them visible from userspace */
int dquot_quota_sync(struct super_block *sb, int type) { struct quota_info *dqopt = sb_dqopt(sb); int cnt; int ret; ret = dquot_writeback_dquots(sb, type); if (ret) return ret; if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) return 0; /* This is not very clever (and fast) but currently I don't know about * any other simple way of getting quota data to disk and we must get * them there for userspace to be visible... */ if (sb->s_op->sync_fs) sb->s_op->sync_fs(sb, 1); sync_blockdev(sb->s_bdev); /* * Now when everything is written we can discard the pagecache so * that userspace sees the changes. */ for (cnt = 0; cnt < MAXQUOTAS; cnt++) { if (type != -1 && cnt != type) continue; if (!sb_has_quota_active(sb, cnt)) continue; inode_lock(dqopt->files[cnt]); truncate_inode_pages(&dqopt->files[cnt]->i_data, 0); inode_unlock(dqopt->files[cnt]); } return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Christoph Hellwig10666.25%116.67%
Jan Kara4830.00%233.33%
Linus Torvalds (pre-git)21.25%116.67%
Al Viro21.25%116.67%
Linus Torvalds21.25%116.67%
Total160100.00%6100.00%

EXPORT_SYMBOL(dquot_quota_sync);
static unsigned long dqcache_shrink_scan(struct shrinker *shrink, struct shrink_control *sc) { struct dquot *dquot; unsigned long freed = 0; spin_lock(&dq_list_lock); while (!list_empty(&free_dquots) && sc->nr_to_scan) { dquot = list_first_entry(&free_dquots, struct dquot, dq_free); remove_dquot_hash(dquot); remove_free_dquot(dquot); remove_inuse(dquot); do_destroy_dquot(dquot); sc->nr_to_scan--; freed++; } spin_unlock(&dq_list_lock); return freed; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds4949.49%120.00%
Dave Chinner3030.30%120.00%
Niu YaWei1212.12%120.00%
Jan Kara88.08%240.00%
Total99100.00%5100.00%


static unsigned long dqcache_shrink_count(struct shrinker *shrink, struct shrink_control *sc) { return vfs_pressure_ratio( percpu_counter_read_positive(&dqstats.counter[DQST_FREE_DQUOTS])); }

Contributors

PersonTokensPropCommitsCommitProp
Dmitriy Monakhov1031.25%218.18%
Dave Chinner825.00%218.18%
Ying Han412.50%19.09%
Glauber de Oliveira Costa39.38%19.09%
Linus Torvalds39.38%19.09%
Linus Torvalds (pre-git)26.25%218.18%
Andrew Morton26.25%218.18%
Total32100.00%11100.00%

static struct shrinker dqcache_shrinker = { .count_objects = dqcache_shrink_count, .scan_objects = dqcache_shrink_scan, .seeks = DEFAULT_SEEKS, }; /* * Put reference to dquot */
void dqput(struct dquot *dquot) { int ret; if (!dquot) return; #ifdef CONFIG_QUOTA_DEBUG if (!atomic_read(&dquot->dq_count)) { quota_error(dquot->dq_sb, "trying to free free dquot of %s %d", quotatypes[dquot->dq_id.type], from_kqid(&init_user_ns, dquot->dq_id)); BUG(); } #endif dqstats_inc(DQST_DROPS); we_slept: spin_lock(&dq_list_lock); if (atomic_read(&dquot->dq_count) > 1) { /* We have more than one user... nothing to do */ atomic_dec(&dquot->dq_count); /* Releasing dquot during quotaoff phase? */ if (!sb_has_quota_active(dquot->dq_sb, dquot->dq_id.type) && atomic_read(&dquot->dq_count) == 1) wake_up(&dquot_ref_wq); spin_unlock(&dq_list_lock); return; } /* Need to release dquot? */ if (dquot_dirty(dquot)) { spin_unlock(&dq_list_lock); /* Commit dquot before releasing */ ret = dquot->dq_sb->dq_op->write_dquot(dquot); if (ret < 0) { quota_error(dquot->dq_sb, "Can't write quota structure" " (error %d). Quota may get out of sync!", ret); /* * We clear dirty bit anyway, so that we avoid * infinite loop here */ clear_dquot_dirty(dquot); } goto we_slept; } if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { spin_unlock(&dq_list_lock); dquot->dq_sb->dq_op->release_dquot(dquot); goto we_slept; } atomic_dec(&dquot->dq_count); #ifdef CONFIG_QUOTA_DEBUG /* sanity check */ BUG_ON(!list_empty(&dquot->dq_free)); #endif put_dquot_last(dquot); spin_unlock(&dq_list_lock); }

Contributors

PersonTokensPropCommitsCommitProp
Andrew Morton9133.21%420.00%
Linus Torvalds (pre-git)8029.20%420.00%
Jan Kara7828.47%735.00%
Eric W. Biedermann124.38%15.00%
Jiaying Zhang72.55%15.00%
Eric Sesterhenn / Snakebyte31.09%15.00%
Dmitriy Monakhov20.73%15.00%
Linus Torvalds10.36%15.00%
Total274100.00%20100.00%

EXPORT_SYMBOL(dqput);
struct dquot *dquot_alloc(struct super_block *sb, int type) { return kmem_cache_zalloc(dquot_cachep, GFP_NOFS); }

Contributors

PersonTokensPropCommitsCommitProp
Jan Kara23100.00%1100.00%
Total23100.00%1100.00%

EXPORT_SYMBOL(dquot_alloc);
static struct dquot *get_empty_dquot(struct super_block *sb, int type) { struct dquot *dquot; dquot = sb->dq_op->alloc_dquot(sb, type); if(!dquot) return NULL; mutex_init(&dquot->dq_lock); INIT_LIST_HEAD(&dquot->dq_free); INIT_LIST_HEAD(&dquot->dq_inuse); INIT_HLIST_NODE(&dquot->dq_hash); INIT_LIST_HEAD(&dquot->dq_dirty); dquot->dq_sb = sb; dquot->dq_id = make_kqid_invalid(type); atomic_set(&dquot->dq_count, 1); spin_lock_init(&dquot->dq_dqb_lock); return dquot; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)5244.07%425.00%
Jan Kara3428.81%425.00%
Andrew Morton1411.86%318.75%
Linus Torvalds1311.02%212.50%
Eric W. Biedermann43.39%212.50%
Ingo Molnar10.85%16.25%
Total118100.00%16100.00%

/* * Get reference to dquot * * Locking is slightly tricky here. We are guarded from parallel quotaoff() * destroying our dquot by: * a) checking for quota flags under dq_list_lock and * b) getting a reference to dquot before we release dq_list_lock */
struct dquot *dqget(struct super_block *sb, struct kqid qid) { unsigned int hashent = hashfn(sb, qid); struct dquot *dquot, *empty = NULL; if (!qid_has_mapping(sb->s_user_ns, qid)) return ERR_PTR(-EINVAL); if (!sb_has_quota_active(sb, qid.type)) return ERR_PTR(-ESRCH); we_slept: spin_lock(&dq_list_lock); spin_lock(&dq_state_lock); if (!sb_has_quota_active(sb, qid.type)) { spin_unlock(&dq_state_lock); spin_unlock(&dq_list_lock); dquot = ERR_PTR(-ESRCH); goto out; } spin_unlock(&dq_state_lock); dquot = find_dquot(hashent, sb, qid); if (!dquot) { if (!empty) { spin_unlock(&dq_list_lock); empty = get_empty_dquot(sb, qid.type); if (!empty) schedule(); /* Try to wait for a moment... */ goto we_slept; } dquot = empty; empty = NULL; dquot->dq_id = qid; /* all dquots go on the inuse_list */ put_inuse(dquot); /* hash it first so it can be found */ insert_dquot_hash(dquot); spin_unlock(&dq_list_lock); dqstats_inc(DQST_LOOKUPS); } else { if (!atomic_read(&dquot->dq_count)) remove_free_dquot(dquot); atomic_inc(&dquot->dq_count); spin_unlock(&dq_list_lock); dqstats_inc(DQST_CACHE_HITS); dqstats_inc(DQST_LOOKUPS); } /* Wait for dq_lock - after this we know that either dquot_release() is * already finished or it will be canceled due to dq_count > 1 test */ wait_on_dquot(dquot); /* Read the dquot / allocate space in quota file */ if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { int err; err = sb->dq_op->acquire_dquot(dquot); if (err < 0) { dqput(dquot); dquot = ERR_PTR(err); goto out; } } /* * Make sure following reads see filled structure - paired with * smp_mb__before_atomic() in dquot_acquire(). */ smp_rmb(); #ifdef CONFIG_QUOTA_DEBUG BUG_ON(!dquot->dq_sb); /* Has somebody invalidated entry under us? */ #endif out: if (empty) do_destroy_dquot(empty); return dquot; }

Contributors

PersonTokensPropCommitsCommitProp
Jan Kara17248.18%937.50%
Andrew Morton7420.73%312.50%
Linus Torvalds (pre-git)5415.13%520.83%
Eric W. Biedermann318.68%416.67%
Dmitriy Monakhov154.20%14.17%
Linus Torvalds71.96%14.17%
Eric Sesterhenn / Snakebyte41.12%14.17%
Total357100.00%24100.00%

EXPORT_SYMBOL(dqget);
static inline struct dquot **i_dquot(struct inode *inode) { return inode->i_sb->s_op->get_dquots(inode); }

Contributors

PersonTokensPropCommitsCommitProp
Jan Kara27100.00%1100.00%
Total27100.00%1100.00%


static int dqinit_needed(struct inode *inode, int type) { struct dquot * const *dquots; int cnt; if (IS_NOQUOTA(inode)) return 0; dquots = i_dquot(inode); if (type != -1) return !dquots[type]; for (cnt = 0; cnt < MAXQUOTAS; cnt++) if (!dquots[cnt]) return 1; return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)6275.61%120.00%
Konstantin Khlebnikov1619.51%120.00%
Jan Kara33.66%240.00%
Linus Torvalds11.22%120.00%
Total82100.00%5100.00%

/* This routine is guarded by s_umount semaphore */
static int add_dquot_ref(struct super_block *sb, int type) { struct inode *inode, *old_inode = NULL; #ifdef CONFIG_QUOTA_DEBUG int reserved = 0; #endif int err = 0; spin_lock(&sb->s_inode_list_lock); list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { spin_lock(&inode->i_lock); if ((inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW)) || !atomic_read(&inode->i_writecount) || !dqinit_needed(inode, type)) { spin_unlock(&inode->i_lock); continue; } __iget(inode); spin_unlock(&inode->i_lock); spin_unlock(&sb->s_inode_list_lock); #ifdef CONFIG_QUOTA_DEBUG if (unlikely(inode_get_rsv_space(inode) > 0)) reserved = 1; #endif iput(old_inode); err = __dquot_initialize(inode, type); if (err) { iput(inode); goto out; } /* * We hold a reference to 'inode' so it couldn't have been * removed from s_inodes list while we dropped the * s_inode_list_lock. We cannot iput the inode now as we can be * holding the last reference and we cannot iput it under * s_inode_list_lock. So we keep the reference and iput it * later. */ old_inode = inode; spin_lock(&sb->s_inode_list_lock); } spin_unlock(&sb->s_inode_list_lock); iput(old_inode); out: #ifdef CONFIG_QUOTA_DEBUG if (reserved) { quota_error(sb, "Writes happened before quota was turned on " "thus quota information is probably inconsistent. " "Please run quotacheck(8)"); } #endif return err; }

Contributors

PersonTokensPropCommitsCommitProp
Jan Kara8436.52%631.58%
Dave Chinner5021.74%210.53%
Chao Yu2711.74%15.26%
Linus Torvalds (pre-git)2711.74%421.05%
Christoph Hellwig187.83%210.53%
Nicholas Piggin156.52%15.26%
Jiaying Zhang52.17%15.26%
Linus Torvalds20.87%15.26%
Dave Jones20.87%15.26%
Total230100.00%19100.00%

/* * Remove references to dquots from inode and add dquot to list for freeing * if we have the last reference to dquot */
static void remove_inode_dquot_ref(struct inode *inode, int type, struct list_head *tofree_head) { struct dquot **dquots = i_dquot(inode); struct dquot *dquot = dquots[type]; if (!dquot) return; dquots[type] = NULL; if (list_empty(&dquot->dq_free)) { /* * The inode still has reference to dquot so it can't be in the * free list */ spin_lock(&dq_list_lock); list_add(&dquot->dq_free, tofree_head); spin_unlock(&dq_list_lock); } else { /* * Dquot is already in a list to put so we won't drop the last * reference here. */ dqput(dquot); } }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)5354.64%545.45%
Konstantin Khlebnikov1616.49%19.09%
Andrew Morton1414.43%19.09%
Niu YaWei99.28%19.09%
Jan Kara44.12%218.18%
Adrian Bunk11.03%19.09%
Total97100.00%11100.00%

/* * Free list of dquots * Dquots are removed from inodes and no new references can be got so we are * the only ones holding reference */
static void put_dquot_list(struct list_head *tofree_head) { struct list_head *act_head; struct dquot *dquot; act_head = tofree_head->next; while (act_head != tofree_head) { dquot = list_entry(act_head, struct dquot, dq_free); act_head = act_head->next; /* Remove dquot from the list so we won't have problems... */ list_del_init(&dquot->dq_free); dqput(dquot); } }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)5886.57%342.86%
Linus Torvalds68.96%114.29%
Dave Jones11.49%114.29%
Jan Kara11.49%114.29%
Andrew Morton11.49%114.29%
Total67100.00%7100.00%


static void remove_dquot_ref(struct super_block *sb, int type, struct list_head *tofree_head) { struct inode *inode; int reserved = 0; spin_lock(&sb->s_inode_list_lock); list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { /* * We have to scan also I_NEW inodes because they can already * have quota pointer initialized. Luckily, we need to touch * only quota pointers and these have separate locking * (dq_data_lock). */ spin_lock(&dq_data_lock); if (!IS_NOQUOTA(inode)) { if (unlikely(inode_get_rsv_space(inode) > 0)) reserved = 1; remove_inode_dquot_ref(inode, type, tofree_head); } spin_unlock(&dq_data_lock); } spin_unlock(&sb->s_inode_list_lock); #ifdef CONFIG_QUOTA_DEBUG if (reserved) { printk(KERN_WARNING "VFS (%s): Writes happened after quota" " was disabled thus quota information is probably " "inconsistent. Please run quotacheck(8).\n", sb->s_id); } #endif }

Contributors

PersonTokensPropCommitsCommitProp
Christoph Hellwig6148.41%125.00%
Dmitriy Monakhov4636.51%125.00%
Niu YaWei1310.32%125.00%
Dave Chinner64.76%125.00%
Total126100.00%4100.00%

/* Gather all references from inodes and drop them */
static void drop_dquot_ref(struct super_block *sb, int type) { LIST_HEAD(tofree_head); if (sb->dq_op) { remove_dquot_ref(sb, type, &tofree_head); synchronize_srcu(&dquot_srcu); put_dquot_list(&tofree_head); } }

Contributors

PersonTokensPropCommitsCommitProp
Andrew Morton3979.59%133.33%
Christoph Hellwig816.33%133.33%
Niu YaWei24.08%133.33%
Total49100.00%3100.00%


static inline void dquot_free_reserved_space(struct dquot *dquot, qsize_t number) { if (dquot->dq_dqb.dqb_rsvspace >= number) dquot->dq_dqb.dqb_rsvspace -= number; else { WARN_ON_ONCE(1); dquot->dq_dqb.dqb_rsvspace = 0; } if (dquot->dq_dqb.dqb_curspace + dquot->dq_dqb.dqb_rsvspace <= dquot->dq_dqb.dqb_bsoftlimit) dquot->dq_dqb.dqb_btime = (time64_t) 0; clear_bit(DQ_BLKS_B, &dquot->dq_flags); }

Contributors

PersonTokensPropCommitsCommitProp
zhangyi (F)4145.56%116.67%
Jan Kara2932.22%350.00%
Linus Torvalds (pre-git)1213.33%116.67%
Mingming Cao88.89%116.67%
Total90100.00%6100.00%


static void dquot_decr_inodes(struct dquot *dquot, qsize_t number) { if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE || dquot->dq_dqb.dqb_curinodes >= number) dquot->dq_dqb.dqb_curinodes -= number; else dquot->dq_dqb.dqb_curinodes = 0; if (dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit) dquot->dq_dqb.dqb_itime = (time64_t) 0; clear_bit(DQ_INODES_B, &dquot->dq_flags); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)4855.17%225.00%
Jan Kara3236.78%450.00%
Andrew Morton66.90%112.50%
Arnd Bergmann11.15%112.50%
Total87100.00%8100.00%


static void dquot_decr_space(struct dquot *dquot, qsize_t number) { if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE || dquot->dq_dqb.dqb_curspace >= number) dquot->dq_dqb.dqb_curspace -= number; else dquot->dq_dqb.dqb_curspace = 0; if (dquot->dq_dqb.dqb_curspace + dquot->dq_dqb.dqb_rsvspace <= dquot->dq_dqb.dqb_bsoftlimit) dquot->dq_dqb.dqb_btime = (time64_t) 0; clear_bit(DQ_BLKS_B, &dquot->dq_flags); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)4750.54%222.22%
Jan Kara3335.48%444.44%
Andrew Morton66.45%111.11%
zhangyi (F)66.45%111.11%
Arnd Bergmann11.08%111.11%
Total93100.00%9100.00%

struct dquot_warn { struct super_block *w_sb; struct kqid w_dq_id; short w_type; };
static int warning_issued(struct dquot *dquot, const int warntype) { int flag = (warntype == QUOTA_NL_BHARDWARN || warntype == QUOTA_NL_BSOFTLONGWARN) ? DQ_BLKS_B : ((warntype == QUOTA_NL_IHARDWARN || warntype == QUOTA_NL_ISOFTLONGWARN) ? DQ_INODES_B : 0); if (!flag) return 0; return test_and_set_bit(flag, &dquot->dq_flags); }

Contributors

PersonTokensPropCommitsCommitProp
Jan Kara65100.00%1100.00%
Total65100.00%1100.00%

#ifdef CONFIG_PRINT_QUOTA_WARNING static int flag_print_warnings = 1;
static int need_print_warning(struct dquot_warn *warn) { if (!flag_print_warnings) return 0; switch (warn->w_dq_id.type) { case USRQUOTA: return uid_eq(current_fsuid(), warn->w_dq_id.uid); case GRPQUOTA: return in_group_p(warn->w_dq_id.gid); case PRJQUOTA: return 1; } return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)3349.25%330.00%
Jan Kara2029.85%330.00%
Eric W. Biedermann1116.42%220.00%
David Howells22.99%110.00%
Li Xi11.49%110.00%
Total67100.00%10100.00%

/* Print warning to user which exceeded quota */
static void print_warning(struct dquot_warn *warn) { char *msg = NULL; struct tty_struct *tty; int warntype = warn->w_type; if (warntype == QUOTA_NL_IHARDBELOW || warntype == QUOTA_NL_ISOFTBELOW || warntype == QUOTA_NL_BHARDBELOW || warntype == QUOTA_NL_BSOFTBELOW || !need_print_warning(warn)) return; tty = get_current_tty(); if (!tty) return; tty_write_message(tty, warn->w_sb->s_id); if (warntype == QUOTA_NL_ISOFTWARN || warntype == QUOTA_NL_BSOFTWARN) tty_write_message(tty, ": warning, "); else tty_write_message(tty, ": write failed, "); tty_write_message(tty, quotatypes[warn->w_dq_id.type]); switch (warntype) { case QUOTA_NL_IHARDWARN: msg = " file limit reached.\r\n"; break; case QUOTA_NL_ISOFTLONGWARN: msg = " file quota exceeded too long.\r\n"; break; case QUOTA_NL_ISOFTWARN: msg = " file quota exceeded.\r\n"; break; case QUOTA_NL_BHARDWARN: msg = " block limit reached.\r\n"; break; case QUOTA_NL_BSOFTLONGWARN: msg = " block quota exceeded too long.\r\n"; break; case QUOTA_NL_BSOFTWARN: msg = " block quota exceeded.\r\n"; break; } tty_write_message(tty, msg); tty_kref_put(tty); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds8144.75%213.33%
Jan Kara5128.18%533.33%
Linus Torvalds (pre-git)3016.57%320.00%
Peter Zijlstra105.52%16.67%
Eric W. Biedermann31.66%16.67%
Alan Cox31.66%16.67%
Andrew Morton21.10%16.67%
Al Viro10.55%16.67%
Total181100.00%15100.00%

#endif
static void prepare_warning(struct dquot_warn *warn, struct dquot *dquot, int warntype) { if (warning_issued(dquot, warntype)) return; warn->w_type = warntype; warn->w_sb = dquot->dq_sb; warn->w_dq_id = dquot->dq_id; }

Contributors

PersonTokensPropCommitsCommitProp
Jan Kara4180.39%150.00%
Linus Torvalds1019.61%150.00%
Total51100.00%2100.00%

/* * Write warnings to the console and send warning messages over netlink. * * Note that this function can call into tty and networking code. */
static void flush_warnings(struct dquot_warn *warn) { int i; for (i = 0; i < MAXQUOTAS; i++) { if (warn[i].w_type == QUOTA_NL_NOWARN) continue; #ifdef CONFIG_PRINT_QUOTA_WARNING print_warning(&warn[i]); #endif quota_send_warning(warn[i].w_dq_id, warn[i].w_sb->s_dev, warn[i].w_type); } }

Contributors

PersonTokensPropCommitsCommitProp
Jan Kara4555.56%240.00%
Linus Torvalds2632.10%120.00%
Steven Whitehouse911.11%120.00%
Linus Torvalds (pre-git)11.23%120.00%
Total81100.00%5100.00%


static int ignore_hardlimit(struct dquot *dquot) { struct mem_dqinfo *info = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_id.type]; return capable(CAP_SYS_RESOURCE) && (info->dqi_format->qf_fmt_id != QFMT_VFS_OLD || !(info->dqi_flags & DQF_ROOT_SQUASH)); }

Contributors

PersonTokensPropCommitsCommitProp
Jan Kara3967.24%342.86%
Linus Torvalds (pre-git)1627.59%342.86%
Eric W. Biedermann35.17%114.29%
Total58100.00%7100.00%


static int dquot_add_inodes(struct dquot *dquot, qsize_t inodes, struct dquot_warn *warn) { qsize_t newinodes; int ret = 0; spin_lock(&dquot->dq_dqb_lock); newinodes = dquot->dq_dqb.dqb_curinodes + inodes; if (!sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_id.type) || test_bit(DQ_FAKE_B, &dquot->dq_flags)) goto add; if (dquot->dq_dqb.dqb_ihardlimit && newinodes > dquot->dq_dqb.dqb_ihardlimit && !ignore_hardlimit(dquot)) { prepare_warning(warn, dquot, QUOTA_NL_IHARDWARN); ret = -EDQUOT; goto out; } if (dquot->dq_dqb.dqb_isoftlimit && newinodes > dquot->dq_dqb.dqb_isoftlimit && dquot->dq_dqb.dqb_itime && ktime_get_real_seconds() >= dquot->dq_dqb.dqb_itime && !ignore_hardlimit(dquot)) { prepare_warning(warn, dquot, QUOTA_NL_ISOFTLONGWARN); ret = -EDQUOT; goto out; } if (dquot->dq_dqb.dqb_isoftlimit && newinodes > dquot->dq_dqb.dqb_isoftlimit && dquot->dq_dqb.dqb_itime == 0) { prepare_warning(warn, dquot, QUOTA_NL_ISOFTWARN); dquot->dq_dqb.dqb_itime = ktime_get_real_seconds() + sb_dqopt(dquot->dq_sb)->info[dquot->dq_id.type].dqi_igrace; } add: dquot->dq_dqb.dqb_curinodes = newinodes; out: spin_unlock(&dquot->dq_dqb_lock); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Jan Kara14155.08%844.44%
Linus Torvalds (pre-git)9336.33%422.22%
Eric W. Biedermann62.34%15.56%
Andrew Morton62.34%15.56%
Christoph Hellwig41.56%15.56%
Andi Kleen20.78%15.56%
Arnd Bergmann20.78%15.56%
Linus Torvalds20.78%15.56%
Total256100.00%18100.00%


static int dquot_add_space(struct dquot *dquot, qsize_t space, qsize_t rsv_space, unsigned int flags, struct dquot_warn *warn) { qsize_t tspace; struct super_block *sb = dquot->dq_sb; int ret = 0; spin_lock(&dquot->dq_dqb_lock); if (!sb_has_quota_limits_enabled(sb, dquot->dq_id.type) || test_bit(DQ_FAKE_B, &dquot->dq_flags)) goto finish; tspace = dquot->dq_dqb.dqb_curspace + dquot->dq_dqb.dqb_rsvspace + space + rsv_space; if (dquot->dq_dqb.dqb_bhardlimit && tspace > dquot->dq_dqb.dqb_bhardlimit && !ignore_hardlimit(dquot)) { if (flags & DQUOT_SPACE_WARN) prepare_warning(warn, dquot, QUOTA_NL_BHARDWARN); ret = -EDQUOT; goto finish; } if (dquot->dq_dqb.dqb_bsoftlimit && tspace > dquot->dq_dqb.dqb_bsoftlimit && dquot->dq_dqb.dqb_btime && ktime_get_real_seconds() >= dquot->dq_dqb.dqb_btime && !ignore_hardlimit(dquot)) { if (flags & DQUOT_SPACE_WARN) prepare_warning(warn, dquot, QUOTA_NL_BSOFTLONGWARN); ret = -EDQUOT; goto finish; } if (dquot->dq_dqb.dqb_bsoftlimit && tspace > dquot->dq_dqb.dqb_bsoftlimit && dquot->dq_dqb.dqb_btime == 0) { if (flags & DQUOT_SPACE_WARN) { prepare_warning(warn, dquot, QUOTA_NL_BSOFTWARN); dquot->dq_dqb.dqb_btime = ktime_get_real_seconds() + sb_dqopt(sb)->info[dquot->dq_id.type].dqi_bgrace; } else { /* * We don't allow preallocation to exceed softlimit so exceeding will * be always printed */ ret = -EDQUOT; goto finish; } } finish: /* * We have to be careful and go through warning generation & grace time * setting even if DQUOT_SPACE_NOFAIL is set. That's why we check it * only here... */ if (flags & DQUOT_SPACE_NOFAIL) ret = 0; if (!ret) { dquot->dq_dqb.dqb_rsvspace += rsv_space; dquot->dq_dqb.dqb_curspace += space; } spin_unlock(&dquot->dq_dqb_lock); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Jan Kara18956.93%947.37%
Linus Torvalds (pre-git)9929.82%315.79%
Mingming Cao206.02%15.26%
Eric W. Biedermann61.81%15.26%
Christoph Hellwig61.81%15.26%
Andrew Morton61.81%15.26%
Andi Kleen20.60%15.26%
Arnd Bergmann20.60%15.26%
Linus Torvalds20.60%15.26%
Total332100.00%19100.00%


static int info_idq_free(struct dquot *dquot, qsize_t inodes) { qsize_t newinodes; if (test_bit(DQ_FAKE_B, &dquot->dq_flags) || dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit || !sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_id.type)) return QUOTA_NL_NOWARN; newinodes = dquot->dq_dqb.dqb_curinodes - inodes; if (newinodes <= dquot->dq_dqb.dqb_isoftlimit) return QUOTA_NL_ISOFTBELOW; if (dquot->dq_dqb.dqb_curinodes >= dquot->dq_dqb.dqb_ihardlimit && newinodes < dquot->dq_dqb.dqb_ihardlimit) return QUOTA_NL_IHARDBELOW; return QUOTA_NL_NOWARN; }

Contributors

PersonTokensPropCommitsCommitProp
Jan Kara10697.25%480.00%
Eric W. Biedermann32.75%120.00%
Total109100.00%5100.00%


static int info_bdq_free(struct dquot *dquot, qsize_t space) { qsize_t tspace; tspace = dquot->dq_dqb.dqb_curspace + dquot->dq_dqb.dqb_rsvspace; if (test_bit(DQ_FAKE_B, &dquot->dq_flags) || tspace <= dquot->dq_dqb.dqb_bsoftlimit) return QUOTA_NL_NOWARN; if (tspace - space <= dquot->dq_dqb.dqb_bsoftlimit) return QUOTA_NL_BSOFTBELOW; if (tspace >= dquot->dq_dqb.dqb_bhardlimit && tspace - space < dquot->dq_dqb.dqb_bhardlimit) return QUOTA_NL_BHARDBELOW; return QUOTA_NL_NOWARN; }

Contributors

PersonTokensPropCommitsCommitProp
Jan Kara7477.89%150.00%
zhangyi (F)2122.11%150.00%
Total95100.00%2100.00%


static int dquot_active(const struct inode *inode) { struct super_block *sb = inode->i_sb; if (IS_NOQUOTA(inode)) return 0; return sb_any_quota_loaded(sb) & ~sb_any_quota_suspended(sb); }

Contributors

PersonTokensPropCommitsCommitProp
Christoph Hellwig43100.00%1100.00%
Total43100.00%1100.00%

/* * Initialize quota pointers in inode * * It is better to call this function outside of any transaction as it * might need a lot of space in journal for dquot structure allocation. */
static int __dquot_initialize(struct inode *inode, int type) { int cnt, init_needed = 0; struct dquot **dquots, *got[MAXQUOTAS] = {}; struct super_block *sb = inode->i_sb; qsize_t rsv; int ret = 0; if (!dquot_active(inode)) return 0; dquots = i_dquot(inode); /* First get references to structures we might need. */ for (cnt = 0; cnt < MAXQUOTAS; cnt++) { struct kqid qid; kprojid_t projid; int rc; struct dquot *dquot; if (type != -1 && cnt != type) continue; /* * The i_dquot should have been initialized in most cases, * we check it without locking here to avoid unnecessary * dqget()/dqput() calls. */ if (dquots[cnt]) continue; if (!sb_has_quota_active(sb, cnt)) continue; init_needed = 1; switch (cnt) { case USRQUOTA: qid = make_kqid_uid(inode->i_uid); break; case GRPQUOTA: qid = make_kqid_gid(inode->i_gid); break; case PRJQUOTA: rc = inode->i_sb->dq_op->get_projid(inode, &projid); if (rc) continue; qid = make_kqid_projid(projid); break; } dquot = dqget(sb, qid); if (IS_ERR(dquot)) { /* We raced with somebody turning quotas off... */ if (PTR_ERR(dquot) != -ESRCH) { ret = PTR_ERR(dquot); goto out_put; } dquot = NULL; } got[cnt] = dquot; } /* All required i_dquot has been initialized */ if (!init_needed) return 0; spin_lock(&dq_data_lock); if (IS_NOQUOTA(inode)) goto out_lock; for (cnt = 0; cnt < MAXQUOTAS; cnt++) { if (type != -1 && cnt != type) continue; /* Avoid races with quotaoff() */ if (!sb_has_quota_active(sb, cnt)) continue; /* We could race with quotaon or dqget() could have failed */ if (!got[cnt]) continue; if (!dquots[cnt]) { dquots[cnt] = got[cnt]; got[cnt] = NULL; /* * Make quota reservation system happy if someone * did a write before quota was turned on */ rsv = inode_get_rsv_space(inode); if (unlikely(rsv)) { spin_lock(&inode->i_lock); /* Get reservation again under proper lock */ rsv = __inode_get_rsv_space(inode); spin_lock(&dquots[cnt]->dq_dqb_lock); dquots[cnt]->dq_dqb.dqb_rsvspace += rsv; spin_unlock(&dquots[cnt]->dq_dqb_lock); spin_unlock(&inode->i_lock); } } } out_lock: spin_unlock(&dq_data_lock); out_put: /* Drop unused references */ dqput_all(got); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Jan Kara22550.34%731.82%
Linus Torvalds (pre-git)9521.25%313.64%
Li Xi4910.96%14.55%
Niu YaWei265.82%29.09%
Andrew Morton153.36%29.09%
Konstantin Khlebnikov153.36%14.55%
Eric W. Biedermann132.91%14.55%
Christoph Hellwig51.12%29.09%
Nikolay Borisov20.45%14.55%
Linus Torvalds10.22%14.55%
Dmitriy Monakhov10.22%14.55%
Total447100.00%22100.00%


int dquot_initialize(struct inode *inode) { return __dquot_initialize(inode, -1); }

Contributors

PersonTokensPropCommitsCommitProp
Christoph Hellwig1578.95%133.33%
Jan Kara421.05%266.67%
Total19100.00%3100.00%

EXPORT_SYMBOL(dquot_initialize);
bool dquot_initialize_needed(struct inode *inode) { struct dquot **dquots; int i; if (!dquot_active(inode)) return false; dquots = i_dquot(inode); for (i = 0; i < MAXQUOTAS; i++) if (!dquots[i] && sb_has_quota_active(inode->i_sb, i)) return true; return false; }

Contributors

PersonTokensPropCommitsCommitProp
Tahsin Erdogan73100.00%1100.00%
Total73100.00%1100.00%

EXPORT_SYMBOL(dquot_initialize_needed); /* * Release all quotas referenced by inode. * * This function only be called on inode free or converting * a file to quota file, no other users for the i_dquot in * both cases, so we needn't call synchronize_srcu() after * clearing i_dquot. */
static void __dquot_drop(struct inode *inode) { int cnt; struct dquot **dquots = i_dquot(inode); struct dquot *put[MAXQUOTAS]; spin_lock(&dq_data_lock); for (cnt = 0; cnt < MAXQUOTAS; cnt++) { put[cnt] = dquots[cnt]; dquots[cnt] = NULL; } spin_unlock(&dq_data_lock); dqput_all(put); }

Contributors

PersonTokensPropCommitsCommitProp
Jan Kara5668.29%337.50%
Konstantin Khlebnikov1315.85%112.50%
Andrew Morton56.10%112.50%
Niu YaWei44.88%112.50%
Christoph Hellwig33.66%112.50%
Dmitriy Monakhov11.22%112.50%
Total82100.00%8100.00%


void dquot_drop(struct inode *inode) { struct dquot * const *dquots; int cnt; if (IS_NOQUOTA(inode)) return; /* * Test before calling to rule out calls from proc and such * where we are not allowed to block. Note that this is * actually reliable test even without the lock - the caller * must assure that nobody can come after the DQUOT_DROP and * add quota pointers back anyway. */ dquots = i_dquot(inode); for (cnt = 0; cnt < MAXQUOTAS; cnt++) { if (dquots[cnt]) break; } if (cnt < MAXQUOTAS) __dquot_drop(inode); }

Contributors

PersonTokensPropCommitsCommitProp
Jan Kara4665.71%133.33%
Konstantin Khlebnikov1521.43%133.33%
Christoph Hellwig912.86%133.33%
Total70100.00%3100.00%

EXPORT_SYMBOL(dquot_drop); /* * inode_reserved_space is managed internally by quota, and protected by * i_lock similar to i_blocks+i_bytes. */
static qsize_t *inode_reserved_space(struct inode * inode) { /* Filesystem must explicitly define it's own method in order to use * quota reservation interface */ BUG_ON(!inode->i_sb->dq_op->get_reserved_space); return inode->i_sb->dq_op->get_reserved_space(inode); }

Contributors

PersonTokensPropCommitsCommitProp
Dmitriy Monakhov37100.00%1100.00%
Total37100.00%1100.00%


static qsize_t __inode_get_rsv_space(struct inode *inode) { if (!inode->i_sb->dq_op->get_reserved_space) return 0; return *inode_reserved_space(inode); }

Contributors

PersonTokensPropCommitsCommitProp
Jan Kara1753.12%150.00%
Dmitriy Monakhov1546.88%150.00%
Total32100.00%2100.00%


static qsize_t inode_get_rsv_space(struct inode *inode) { qsize_t ret; if (!inode->i_sb->dq_op->get_reserved_space) return 0; spin_lock(&inode->i_lock); ret = __inode_get_rsv_space(inode); spin_unlock(&inode->i_lock); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Dmitriy Monakhov3972.22%133.33%
Jan Kara1527.78%266.67%
Total54100.00%3100.00%

/* * This functions updates i_blocks+i_bytes fields and quota information * (together with appropriate checks). * * NOTE: We absolutely rely on the fact that caller dirties the inode * (usually helpers in quotaops.h care about this) and holds a handle for * the current transaction so that dquot write and inode write go into the * same transaction. */ /* * This operation can block, but only after everything is updated */
int __dquot_alloc_space(struct inode *inode, qsize_t number, int flags) { int cnt, ret = 0, index; struct dquot_warn warn[MAXQUOTAS]; int reserve = flags & DQUOT_SPACE_RESERVE; struct dquot **dquots; if (!dquot_active(inode)) { if (reserve) { spin_lock(&inode->i_lock); *inode_reserved_space(inode) += number; spin_unlock(&inode->i_lock); } else { inode_add_bytes(inode, number); } goto out; } for (cnt = 0; cnt < MAXQUOTAS; cnt++) warn[cnt].w_type = QUOTA_NL_NOWARN; dquots = i_dquot(inode); index = srcu_read_lock(&dquot_srcu); spin_lock(&inode->i_lock); for (cnt = 0; cnt < MAXQUOTAS; cnt++) { if (!dquots[cnt]) continue; if (flags & DQUOT_SPACE_RESERVE) { ret = dquot_add_space(dquots[cnt], 0, number, flags, &warn[cnt]); } else { ret = dquot_add_space(dquots[cnt], number, 0, flags, &warn[cnt]); } if (ret) { /* Back out changes we already did */ for (cnt--; cnt >= 0; cnt--) { if (!dquots[cnt]) continue; spin_lock(&dquots[cnt]->dq_dqb_lock); if (flags & DQUOT_SPACE_RESERVE) { dquots[cnt]->dq_dqb.dqb_rsvspace -= number; } else { dquots[cnt]->dq_dqb.dqb_curspace -= number; } spin_unlock(&dquots[cnt]->dq_dqb_lock); } spin_unlock(&inode->i_lock); goto out_flush_warn; } } if (reserve) *inode_reserved_space(inode) += number; else __inode_add_bytes(inode, number); spin_unlock(&inode->i_lock); if (reserve) goto out_flush_warn; mark_all_dquot_dirty(dquots); out_flush_warn: srcu_read_unlock(&dquot_srcu, index); flush_warnings(warn); out: return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Jan Kara18047.62%728.00%
Andrew Morton6817.99%416.00%
Linus Torvalds (pre-git)359.26%312.00%
Dmitriy Monakhov277.14%28.00%
Mingming Cao215.56%14.00%
Konstantin Khlebnikov133.44%14.00%
Niu YaWei102.65%14.00%
Eric Sandeen82.12%14.00%
Linus Torvalds61.59%14.00%
Christoph Hellwig61.59%312.00%
Jie Liu41.06%14.00%
Total378100.00%25100.00%

EXPORT_SYMBOL(__dquot_alloc_space); /* * This operation can block, but only after everything is updated */
int dquot_alloc_inode(struct inode *inode) { int cnt, ret = 0, index; struct dquot_warn warn[MAXQUOTAS]; struct dquot * const *dquots; if (!dquot_active(inode)) return 0; for (cnt = 0; cnt < MAXQUOTAS; cnt++) warn[cnt].w_type = QUOTA_NL_NOWARN; dquots = i_dquot(inode); index = srcu_read_lock(&dquot_srcu); spin_lock(&inode->i_lock); for (cnt = 0; cnt < MAXQUOTAS; cnt++) { if (!dquots[cnt]) continue; ret = dquot_add_inodes(dquots[cnt], 1, &warn[cnt]); if (ret) { for (cnt--; cnt >= 0; cnt--) { if (!dquots[cnt]) continue; /* Back out changes we already did */ spin_lock(&dquots[cnt]->dq_dqb_lock); dquots[cnt]->dq_dqb.dqb_curinodes--; spin_unlock(&dquots[cnt]->dq_dqb_lock); } goto warn_put_all; } } warn_put_all: spin_unlock(&inode->i_lock); if (ret == 0) mark_all_dquot_dirty(dquots); srcu_read_unlock(&dquot_srcu, index); flush_warnings(warn); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Jan Kara8335.62%630.00%
Linus Torvalds (pre-git)5423.18%210.00%
Andrew Morton3816.31%315.00%
Linus Torvalds2611.16%15.00%
Christoph Hellwig125.15%315.00%
Niu YaWei104.29%15.00%
Konstantin Khlebnikov73.00%15.00%
Al Viro10.43%15.00%
Dmitriy Monakhov10.43%15.00%
Mingming Cao10.43%15.00%
Total233100.00%20100.00%

EXPORT_SYMBOL(dquot_alloc_inode); /* * Convert in-memory reserved quotas to real consumed quotas */
int dquot_claim_space_nodirty(struct inode *inode, qsize_t number) { struct dquot **dquots; int cnt, index; if (!dquot_active(inode)) { spin_lock(&inode->i_lock); *inode_reserved_space(inode) -= number; __inode_add_bytes(inode, number); spin_unlock(&inode->i_lock); return 0; } dquots = i_dquot(inode); index = srcu_read_lock(&dquot_srcu); spin_lock(&inode->i_lock); /* Claim reserved quotas to allocated quotas */ for (cnt = 0; cnt < MAXQUOTAS; cnt++) { if (dquots[cnt]) { struct dquot *dquot = dquots[cnt]; spin_lock(&dquot->dq_dqb_lock); if (WARN_ON_ONCE(dquot->dq_dqb.dqb_rsvspace < number)) number = dquot->dq_dqb.dqb_rsvspace; dquot->dq_dqb.dqb_curspace += number; dquot->dq_dqb.dqb_rsvspace -= number; spin_unlock(&dquot->dq_dqb_lock); } } /* Update inode bytes */ *inode_reserved_space(inode) -= number; __inode_add_bytes(inode, number); spin_unlock(&inode->i_lock); mark_all_dquot_dirty(dquots); srcu_read_unlock(&dquot_srcu, index); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Jan Kara9643.84%426.67%
Mingming Cao3315.07%16.67%
Dmitriy Monakhov2210.05%213.33%
Linus Torvalds209.13%16.67%
Konstantin Khlebnikov167.31%16.67%
Linus Torvalds (pre-git)156.85%320.00%
Niu YaWei104.57%16.67%
Christoph Hellwig73.20%213.33%
Total219100.00%15100.00%

EXPORT_SYMBOL(dquot_claim_space_nodirty); /* * Convert allocated space back to in-memory reserved quotas */
void dquot_reclaim_space_nodirty(struct inode *inode, qsize_t number) { struct dquot **dquots; int cnt, index; if (!dquot_active(inode)) { spin_lock(&inode->i_lock); *inode_reserved_space(inode) += number; __inode_sub_bytes(inode, number); spin_unlock(&inode->i_lock); return; } dquots = i_dquot(inode); index = srcu_read_lock(&dquot_srcu); spin_lock(&inode->i_lock); /* Claim reserved quotas to allocated quotas */ for (cnt = 0; cnt < MAXQUOTAS; cnt++) { if (dquots[cnt]) { struct dquot *dquot = dquots[cnt]; spin_lock(&dquot->dq_dqb_lock); if (WARN_ON_ONCE(dquot->dq_dqb.dqb_curspace < number)) number = dquot->dq_dqb.dqb_curspace; dquot->dq_dqb.dqb_rsvspace += number; dquot->dq_dqb.dqb_curspace -= number; spin_unlock(&dquot->dq_dqb_lock); } } /* Update inode bytes */ *inode_reserved_space(inode) += number; __inode_sub_bytes(inode, number); spin_unlock(&inode->i_lock); mark_all_dquot_dirty(dquots); srcu_read_unlock(&dquot_srcu, index); return; }

Contributors

PersonTokensPropCommitsCommitProp
Jan Kara18987.91%466.67%
Konstantin Khlebnikov167.44%116.67%
Niu YaWei104.65%116.67%
Total215100.00%6100.00%

EXPORT_SYMBOL(dquot_reclaim_space_nodirty); /* * This operation can block, but only after everything is updated */
void __dquot_free_space(struct inode *inode, qsize_t number, int flags) { unsigned int cnt; struct dquot_warn warn[MAXQUOTAS]; struct dquot **dquots; int reserve = flags & DQUOT_SPACE_RESERVE, index; if (!dquot_active(inode)) { if (reserve) { spin_lock(&inode->i_lock); *inode_reserved_space(inode) -= number; spin_unlock(&inode->i_lock); } else { inode_sub_bytes(inode, number); } return; } dquots = i_dquot(inode); index = srcu_read_lock(&dquot_srcu); spin_lock(&inode->i_lock); for (cnt = 0; cnt < MAXQUOTAS; cnt++) { int wtype; warn[cnt].w_type = QUOTA_NL_NOWARN; if (!dquots[cnt]) continue; spin_lock(&dquots[cnt]->dq_dqb_lock); wtype = info_bdq_free(dquots[cnt], number); if (wtype != QUOTA_NL_NOWARN) prepare_warning(&warn[cnt], dquots[cnt], wtype); if (reserve) dquot_free_reserved_space(dquots[cnt], number); else dquot_decr_space(dquots[cnt], number); spin_unlock(&dquots[cnt]->dq_dqb_lock); } if (reserve) *inode_reserved_space(inode) -= number; else __inode_sub_bytes(inode, number); spin_unlock(&inode->i_lock); if (reserve) goto out_unlock; mark_all_dquot_dirty(dquots); out_unlock: srcu_read_unlock(&dquot_srcu, index); flush_warnings(warn); }

Contributors

PersonTokensPropCommitsCommitProp
Jan Kara14951.74%838.10%
Linus Torvalds (pre-git)4716.32%314.29%
Dmitriy Monakhov3010.42%29.52%
Linus Torvalds175.90%14.76%
Andrew Morton165.56%29.52%
Niu YaWei103.47%14.76%
Eric Sandeen82.78%14.76%
Konstantin Khlebnikov72.43%14.76%
Christoph Hellwig41.39%29.52%
Total288100.00%21100.00%

EXPORT_SYMBOL(__dquot_free_space); /* * This operation can block, but only after everything is updated */
void dquot_free_inode(struct inode *inode) { unsigned int cnt; struct dquot_warn warn[MAXQUOTAS]; struct dquot * const *dquots; int index; if (!dquot_active(inode)) return; dquots = i_dquot(inode); index = srcu_read_lock(&dquot_srcu); spin_lock(&inode->i_lock); for (cnt = 0; cnt < MAXQUOTAS; cnt++) { int wtype; warn[cnt].w_type = QUOTA_NL_NOWARN; if (!dquots[cnt]) continue; spin_lock(&dquots[cnt]->dq_dqb_lock); wtype = info_idq_free(dquots[cnt], 1); if (wtype != QUOTA_NL_NOWARN) prepare_warning(&warn[cnt], dquots[cnt], wtype); dquot_decr_inodes(dquots[cnt], 1); spin_unlock(&dquots[cnt]->dq_dqb_lock); } spin_unlock(&inode->i_lock); mark_all_dquot_dirty(dquots); srcu_read_unlock(&dquot_srcu, index); flush_warnings(warn); }

Contributors

PersonTokensPropCommitsCommitProp
Jan Kara9851.31%630.00%
Andrew Morton4925.65%420.00%
Linus Torvalds (pre-git)178.90%315.00%
Niu YaWei115.76%15.00%
Konstantin Khlebnikov73.66%15.00%
Christoph Hellwig63.14%210.00%
Linus Torvalds10.52%15.00%
Al Viro10.52%15.00%
Dmitriy Monakhov10.52%15.00%
Total191100.00%20100.00%

EXPORT_SYMBOL(dquot_free_inode); /* * Transfer the number of inode and blocks from one diskquota to an other. * On success, dquot references in transfer_to are consumed and references * to original dquots that need to be released are placed there. On failure, * references are kept untouched. * * This operation can block, but only after everything is updated * A transaction must be started when entering this function. * * We are holding reference on transfer_from & transfer_to, no need to * protect them by srcu_read_lock(). */
int __dquot_transfer(struct inode *inode, struct dquot **transfer_to) { qsize_t cur_space; qsize_t rsv_space = 0; qsize_t inode_usage = 1; struct dquot *transfer_from[MAXQUOTAS] = {}; int cnt, ret = 0; char is_valid[MAXQUOTAS] = {}; struct dquot_warn warn_to[MAXQUOTAS]; struct dquot_warn warn_from_inodes[MAXQUOTAS]; struct dquot_warn warn_from_space[MAXQUOTAS]; if (IS_NOQUOTA(inode)) return 0; if (inode->i_sb->dq_op->get_inode_usage) { ret = inode->i_sb->dq_op->get_inode_usage(inode, &inode_usage); if (ret) return ret; } /* Initialize the arrays */ for (cnt = 0; cnt < MAXQUOTAS; cnt++) { warn_to[cnt].w_type = QUOTA_NL_NOWARN; warn_from_inodes[cnt].w_type = QUOTA_NL_NOWARN; warn_from_space[cnt].w_type = QUOTA_NL_NOWARN; } spin_lock(&dq_data_lock); spin_lock(&inode->i_lock); if (IS_NOQUOTA(inode)) { /* File without quota accounting? */ spin_unlock(&inode->i_lock); spin_unlock(&dq_data_lock); return 0; } cur_space = __inode_get_bytes(inode); rsv_space = __inode_get_rsv_space(inode); /* * Build the transfer_from list, check limits, and update usage in * the target structures. */ for (cnt = 0; cnt < MAXQUOTAS; cnt++) { /* * Skip changes for same uid or gid or for turned off quota-type. */ if (!transfer_to[cnt]) continue; /* Avoid races with quotaoff() */ if (!sb_has_quota_active(inode->i_sb, cnt)) continue; is_valid[cnt] = 1; transfer_from[cnt] = i_dquot(inode)[cnt]; ret = dquot_add_inodes(transfer_to[cnt], inode_usage, &warn_to[cnt]); if (ret) goto over_quota; ret = dquot_add_space(transfer_to[cnt], cur_space, rsv_space, 0, &warn_to[cnt]); if (ret) { spin_lock(&transfer_to[cnt]->dq_dqb_lock); dquot_decr_inodes(transfer_to[cnt], inode_usage); spin_unlock(&transfer_to[cnt]->dq_dqb_lock); goto over_quota; } } /* Decrease usage for source structures and update quota pointers */ for (cnt = 0; cnt < MAXQUOTAS; cnt++) { if (!is_valid[cnt]) continue; /* Due to IO error we might not have transfer_from[] structure */ if (transfer_from[cnt]) { int wtype; spin_lock(&transfer_from[cnt]->dq_dqb_lock); wtype = info_idq_free(transfer_from[cnt], inode_usage); if (wtype != QUOTA_NL_NOWARN) prepare_warning(&warn_from_inodes[cnt], transfer_from[cnt], wtype); wtype = info_bdq_free(transfer_from[cnt], cur_space + rsv_space); if (wtype != QUOTA_NL_NOWARN) prepare_warning(&warn_from_space[cnt], transfer_from[cnt], wtype); dquot_decr_inodes(transfer_from[cnt], inode_usage); dquot_decr_space(transfer_from[cnt], cur_space); dquot_free_reserved_space(transfer_from[cnt], rsv_space); spin_unlock(&transfer_from[cnt]->dq_dqb_lock); } i_dquot(inode)[cnt] = transfer_to[cnt]; } spin_unlock(&inode->i_lock); spin_unlock(&dq_data_lock); mark_all_dquot_dirty(transfer_from); mark_all_dquot_dirty(transfer_to); flush_warnings(warn_to); flush_warnings(warn_from_inodes); flush_warnings(warn_from_space); /* Pass back references to put */ for (cnt = 0; cnt < MAXQUOTAS; cnt++) if (is_valid[cnt]) transfer_to[cnt] = transfer_from[cnt]; return 0; over_quota: /* Back out changes we already did */ for (cnt--; cnt >= 0; cnt--) { if (!is_valid[cnt]) continue; spin_lock(&transfer_to[cnt]->dq_dqb_lock); dquot_decr_inodes(transfer_to[cnt], inode_usage); dquot_decr_space(transfer_to[cnt], cur_space); dquot_free_reserved_space(transfer_to[cnt], rsv_space); spin_unlock(&transfer_to[cnt]->dq_dqb_lock); } spin_unlock(&inode->i_lock); spin_unlock(&dq_data_lock); flush_warnings(warn_to); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Jan Kara38353.79%1643.24%
Linus Torvalds (pre-git)9112.78%718.92%
Andrew Morton496.88%513.51%
Dmitriy Monakhov476.60%25.41%
Tahsin Erdogan436.04%12.70%
Linus Torvalds354.92%12.70%
Konstantin Khlebnikov223.09%12.70%
Christoph Hellwig192.67%25.41%
Mingming Cao192.67%12.70%
Niu YaWei40.56%12.70%
Total712100.00%37100.00%

EXPORT_SYMBOL(__dquot_transfer); /* Wrapper for transferring ownership of an inode for uid/gid only * Called from FSXXX_setattr() */
int dquot_transfer(struct inode *inode, struct iattr *iattr) { struct dquot *transfer_to[MAXQUOTAS] = {}; struct dquot *dquot; struct super_block *sb = inode->i_sb; int ret; if (!dquot_active(inode)) return 0; if (iattr->ia_valid & ATTR_UID && !uid_eq(iattr->ia_uid, inode->i_uid)){ dquot = dqget(sb, make_kqid_uid(iattr->ia_uid)); if (IS_ERR(dquot)) { if (PTR_ERR(dquot) != -ESRCH) { ret = PTR_ERR(dquot); goto out_put; } dquot = NULL; } transfer_to[USRQUOTA] = dquot; } if (iattr->ia_valid & ATTR_GID && !gid_eq(iattr->ia_gid, inode->i_gid)){ dquot = dqget(sb, make_kqid_gid(iattr->ia_gid)); if (IS_ERR(dquot)) { if (PTR_ERR(dquot) != -ESRCH) { ret = PTR_ERR(dquot); goto out_put; } dquot = NULL; } transfer_to[GRPQUOTA] = dquot; } ret = __dquot_transfer(inode, transfer_to); out_put: dqput_all(transfer_to); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Jan Kara16773.25%758.33%
Dmitriy Monakhov4218.42%18.33%
Eric W. Biedermann167.02%216.67%
Christoph Hellwig31.32%216.67%
Total228100.00%12100.00%

EXPORT_SYMBOL(dquot_transfer); /* * Write info of quota file to disk */
int dquot_commit_info(struct super_block *sb, int type) { struct quota_info *dqopt = sb_dqopt(sb); return dqopt->ops[type]->write_file_info(sb, type); }

Contributors

PersonTokensPropCommitsCommitProp
Andrew Morton1744.74%112.50%
Linus Torvalds (pre-git)1334.21%450.00%
Jan Kara821.05%337.50%
Total38100.00%8100.00%

EXPORT_SYMBOL(dquot_commit_info);
int dquot_get_next_id(struct super_block *sb, struct kqid *qid) { struct quota_info *dqopt = sb_dqopt(sb); if (!sb_has_quota_active(sb, qid->type)) return -ESRCH; if (!dqopt->ops[qid->type]->get_next_id) return -ENOSYS; return dqopt->ops[qid->type]->get_next_id(sb, qid); }

Contributors

PersonTokensPropCommitsCommitProp
Jan Kara76100.00%4100.00%
Total76100.00%4100.00%

EXPORT_SYMBOL(dquot_get_next_id); /* * Definitions of diskquota operations. */ const struct dquot_operations dquot_operations = { .write_dquot = dquot_commit, .acquire_dquot = dquot_acquire, .release_dquot = dquot_release, .mark_dirty = dquot_mark_dquot_dirty, .write_info = dquot_commit_info, .alloc_dquot = dquot_alloc, .destroy_dquot = dquot_destroy, .get_next_id = dquot_get_next_id, }; EXPORT_SYMBOL(dquot_operations); /* * Generic helper for ->open on filesystems supporting disk quotas. */
int dquot_file_open(struct inode *inode, struct file *file) { int error; error = generic_file_open(inode, file); if (!error && (file->f_mode & FMODE_WRITE)) error = dquot_initialize(inode); return error; }

Contributors

PersonTokensPropCommitsCommitProp
Christoph Hellwig4896.00%266.67%
Chao Yu24.00%133.33%
Total50100.00%3100.00%

EXPORT_SYMBOL(dquot_file_open); /* * Turn quota off on a device. type == -1 ==> quotaoff for all types (umount) */
int dquot_disable(struct super_block *sb, int type, unsigned int flags) { int cnt, ret = 0; struct quota_info *dqopt = sb_dqopt(sb); struct inode *toputinode[MAXQUOTAS]; /* s_umount should be held in exclusive mode */ if (WARN_ON_ONCE(down_read_trylock(&sb->s_umount))) up_read(&sb->s_umount); /* Cannot turn off usage accounting without turning off limits, or * suspend quotas and simultaneously turn quotas off. */ if ((flags & DQUOT_USAGE_ENABLED && !(flags & DQUOT_LIMITS_ENABLED)) || (flags & DQUOT_SUSPENDED && flags & (DQUOT_LIMITS_ENABLED | DQUOT_USAGE_ENABLED))) return -EINVAL; /* * Skip everything if there's nothing to do. We have to do this because * sometimes we are called when fill_super() failed and calling * sync_fs() in such cases does no good. */ if (!sb_any_quota_loaded(sb)) return 0; for (cnt = 0; cnt < MAXQUOTAS; cnt++) { toputinode[cnt] = NULL; if (type != -1 && cnt != type) continue; if (!sb_has_quota_loaded(sb, cnt)) continue; if (flags & DQUOT_SUSPENDED) { spin_lock(&dq_state_lock); dqopt->flags |= dquot_state_flag(DQUOT_SUSPENDED, cnt); spin_unlock(&dq_state_lock); } else { spin_lock(&dq_state_lock); dqopt->flags &= ~dquot_state_flag(flags, cnt); /* Turning off suspended quotas? */ if (!sb_has_quota_loaded(sb, cnt) && sb_has_quota_suspended(sb, cnt)) { dqopt->flags &= ~dquot_state_flag( DQUOT_SUSPENDED, cnt); spin_unlock(&dq_state_lock); iput(dqopt->files[cnt]); dqopt->files[cnt] = NULL; continue; } spin_unlock(&dq_state_lock); } /* We still have to keep quota loaded? */ if (sb_has_quota_loaded(sb, cnt) && !(flags & DQUOT_SUSPENDED)) continue; /* Note: these are blocking operations */ drop_dquot_ref(sb, cnt); invalidate_dquots(sb, cnt); /* * Now all dquots should be invalidated, all writes done so we * should be only users of the info. No locks needed. */ if (info_dirty(&dqopt->info[cnt])) sb->dq_op->write_info(sb, cnt); if (dqopt->ops[cnt]->free_file_info) dqopt->ops[cnt]->free_file_info(sb, cnt); put_quota_format(dqopt->info[cnt].dqi_format); toputinode[cnt] = dqopt->files[cnt]; if (!sb_has_quota_loaded(sb, cnt)) dqopt->files[cnt] = NULL; dqopt->info[cnt].dqi_flags = 0; dqopt->info[cnt].dqi_igrace = 0; dqopt->info[cnt].dqi_bgrace = 0; dqopt->ops[cnt] = NULL; } /* Skip syncing and setting flags if quota files are hidden */ if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) goto put_inodes; /* Sync the superblock so that buffers with quota data are written to * disk (and so userspace sees correct data afterwards). */ if (sb->s_op->sync_fs) sb->s_op->sync_fs(sb, 1); sync_blockdev(sb->s_bdev); /* Now the quota files are just ordinary files and we can set the * inode flags back. Moreover we discard the pagecache so that * userspace sees the writes we did bypassing the pagecache. We * must also discard the blockdev buffers so that we see the * changes done by userspace on the next quotaon() */ for (cnt = 0; cnt < MAXQUOTAS; cnt++) /* This can happen when suspending quotas on remount-ro... */ if (toputinode[cnt] && !sb_has_quota_loaded(sb, cnt)) { inode_lock(toputinode[cnt]); toputinode[cnt]->i_flags &= ~S_NOQUOTA; truncate_inode_pages(&toputinode[cnt]->i_data, 0); inode_unlock(toputinode[cnt]); mark_inode_dirty_sync(toputinode[cnt]); } if (sb->s_bdev) invalidate_bdev(sb->s_bdev); put_inodes: for (cnt = 0; cnt < MAXQUOTAS; cnt++) if (toputinode[cnt]) { /* On remount RO, we keep the inode pointer so that we * can reenable quota on the subsequent remount RW. We * have to check 'flags' variable and not use sb_has_ * function because another quotaon / quotaoff could * change global state before we got here. We refuse * to suspend quotas when there is pending delete on * the quota file... */ if (!(flags & DQUOT_SUSPENDED)) iput(toputinode[cnt]); else if (!toputinode[cnt]->i_nlink) ret = -EBUSY; } return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Jan Kara48476.70%1756.67%
Linus Torvalds (pre-git)9114.42%620.00%
Andrew Morton528.24%413.33%
Al Viro30.48%26.67%
Christoph Hellwig10.16%13.33%
Total631100.00%30100.00%

EXPORT_SYMBOL(dquot_disable);
int dquot_quota_off(struct super_block *sb, int type) { return dquot_disable(sb, type, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); }

Contributors

PersonTokensPropCommitsCommitProp
Al Viro1976.00%125.00%
Jan Kara416.00%125.00%
Christoph Hellwig28.00%250.00%
Total25100.00%4100.00%

EXPORT_SYMBOL(dquot_quota_off); /* * Turn quotas on on a device */ /* * Helper function to turn quotas on when we already have the inode of * quota file and no quota information is loaded. */
static int vfs_load_quota_inode(struct inode *inode, int type, int format_id, unsigned int flags) { struct quota_format_type *fmt = find_quota_format(format_id); struct super_block *sb = inode->i_sb; struct quota_info *dqopt = sb_dqopt(sb); int error; if (!fmt) return -ESRCH; if (!S_ISREG(inode->i_mode)) { error = -EACCES; goto out_fmt; } if (IS_RDONLY(inode)) { error = -EROFS; goto out_fmt; } if (!sb->s_op->quota_write || !sb->s_op->quota_read || (type == PRJQUOTA && sb->dq_op->get_projid == NULL)) { error = -EINVAL; goto out_fmt; } /* Filesystems outside of init_user_ns not yet supported */ if (sb->s_user_ns != &init_user_ns) { error = -EINVAL; goto out_fmt; } /* Usage always has to be set... */ if (!(flags & DQUOT_USAGE_ENABLED)) { error = -EINVAL; goto out_fmt; } if (sb_has_quota_loaded(sb, type)) { error = -EBUSY; goto out_fmt; } if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) { /* As we bypass the pagecache we must now flush all the * dirty data and invalidate caches so that kernel sees * changes from userspace. It is not enough to just flush * the quota file since if blocksize < pagesize, invalidation * of the cache could fail because of other unrelated dirty * data */ sync_filesystem(sb); invalidate_bdev(sb->s_bdev); } if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) { /* We don't want quota and atime on quota files (deadlocks * possible) Also nobody should write to the file - we use * special IO operations which ignore the immutable bit. */ inode_lock(inode); inode->i_flags |= S_NOQUOTA; inode_unlock(inode); /* * When S_NOQUOTA is set, remove dquot references as no more * references can be added */ __dquot_drop(inode); } error = -EIO; dqopt->files[type] = igrab(inode); if (!dqopt->files[type]) goto out_file_flags; error = -EINVAL; if (!fmt->qf_ops->check_quota_file(sb, type)) goto out_file_init; dqopt->ops[type] = fmt->qf_ops; dqopt->info[type].dqi_format = fmt; dqopt->info[type].dqi_fmt_id = format_id; INIT_LIST_HEAD(&dqopt->info[type].dqi_dirty_list); error = dqopt->ops[type]->read_file_info(sb, type); if (error < 0) goto out_file_init; if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) { spin_lock(&dq_data_lock); dqopt->info[type].dqi_flags |= DQF_SYS_FILE; spin_unlock(&dq_data_lock); } spin_lock(&dq_state_lock); dqopt->flags |= dquot_state_flag(flags, type); spin_unlock(&dq_state_lock); error = add_dquot_ref(sb, type); if (error) dquot_disable(sb, type, flags); return error; out_file_init: dqopt->files[type] = NULL; iput(inode); out_file_flags: inode_lock(inode); inode->i_flags &= ~S_NOQUOTA; inode_unlock(inode); out_fmt: put_quota_format(fmt); return error; }

Contributors

PersonTokensPropCommitsCommitProp
Jan Kara34267.19%2155.26%
Andrew Morton8115.91%410.53%
Linus Torvalds (pre-git)254.91%615.79%
Eric W. Biedermann203.93%12.63%
Chao Yu163.14%12.63%
Li Xi142.75%12.63%
Christoph Hellwig61.18%25.26%
Al Viro40.79%12.63%
Linus Torvalds10.20%12.63%
Total509100.00%38100.00%

/* Reenable quotas on remount RW */
int dquot_resume(struct super_block *sb, int type) { struct quota_info *dqopt = sb_dqopt(sb); struct inode *inode; int ret = 0, cnt; unsigned int flags; /* s_umount should be held in exclusive mode */ if (WARN_ON_ONCE(down_read_trylock(&sb->s_umount))) up_read(&sb->s_umount); for (cnt = 0; cnt < MAXQUOTAS; cnt++) { if (type != -1 && cnt != type) continue; if (!sb_has_quota_suspended(sb, cnt)) continue; inode = dqopt->files[cnt]; dqopt->files[cnt] = NULL; spin_lock(&dq_state_lock); flags = dqopt->flags & dquot_state_flag(DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED, cnt); dqopt->flags &= ~dquot_state_flag(DQUOT_STATE_FLAGS, cnt); spin_unlock(&dq_state_lock); flags = dquot_generic_flag(flags, cnt); ret = vfs_load_quota_inode(inode, cnt, dqopt->info[cnt].dqi_fmt_id, flags); iput(inode); } return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Jan Kara14374.09%763.64%
Christoph Hellwig4121.24%19.09%
Linus Torvalds (pre-git)52.59%218.18%
Andrew Perepechko42.07%19.09%
Total193100.00%11100.00%

EXPORT_SYMBOL(dquot_resume);
int dquot_quota_on(struct super_block *sb, int type, int format_id, const struct path *path) { int error = security_quota_on(path->dentry); if (error) return error; /* Quota file not on the same filesystem? */ if (path->dentry->d_sb != sb) error = -EXDEV; else error = vfs_load_quota_inode(d_inode(path->dentry), type, format_id, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); return error; }

Contributors

PersonTokensPropCommitsCommitProp
Al Viro5468.35%330.00%
Jan Kara2126.58%550.00%
David Howells33.80%110.00%
Linus Torvalds (pre-git)11.27%110.00%
Total79100.00%10100.00%

EXPORT_SYMBOL(dquot_quota_on); /* * More powerful function for turning on quotas allowing setting * of individual quota flags */
int dquot_enable(struct inode *inode, int type, int format_id, unsigned int flags) { struct super_block *sb = inode->i_sb; /* Just unsuspend quotas? */ BUG_ON(flags & DQUOT_SUSPENDED); /* s_umount should be held in exclusive mode */ if (WARN_ON_ONCE(down_read_trylock(&sb->s_umount))) up_read(&sb->s_umount); if (!flags) return 0; /* Just updating flags needed? */ if (sb_has_quota_loaded(sb, type)) { if (flags & DQUOT_USAGE_ENABLED && sb_has_quota_usage_enabled(sb, type)) return -EBUSY; if (flags & DQUOT_LIMITS_ENABLED && sb_has_quota_limits_enabled(sb, type)) return -EBUSY; spin_lock(&dq_state_lock); sb_dqopt(sb)->flags |= dquot_state_flag(flags, type); spin_unlock(&dq_state_lock); return 0; } return vfs_load_quota_inode(inode, type, format_id, flags); }

Contributors

PersonTokensPropCommitsCommitProp
Jan Kara13185.06%545.45%
Andrew Morton127.79%19.09%
Linus Torvalds (pre-git)53.25%218.18%
Christoph Hellwig42.60%218.18%
Andrew Perepechko21.30%19.09%
Total154100.00%11100.00%

EXPORT_SYMBOL(dquot_enable); /* * This function is used when filesystem needs to initialize quotas * during mount time. */
int dquot_quota_on_mount(struct super_block *sb, char *qf_name, int format_id, int type) { struct dentry *dentry; int error; dentry = lookup_one_len_unlocked(qf_name, sb->s_root, strlen(qf_name)); if (IS_ERR(dentry)) return PTR_ERR(dentry); if (d_really_is_negative(dentry)) { error = -ENOENT; goto out; } error = security_quota_on(dentry); if (!error) error = vfs_load_quota_inode(d_inode(dentry), type, format_id, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); out: dput(dentry); return error; }

Contributors

PersonTokensPropCommitsCommitProp
Jan Kara4539.47%425.00%
Christoph Hellwig3429.82%318.75%
Andrew Morton1513.16%212.50%
Linus Torvalds (pre-git)87.02%318.75%
David Howells65.26%16.25%
Andrew Perepechko32.63%16.25%
Linus Torvalds21.75%16.25%
Al Viro10.88%16.25%
Total114100.00%16100.00%

EXPORT_SYMBOL(dquot_quota_on_mount);
static int dquot_quota_enable(struct super_block *sb, unsigned int flags) { int ret; int type; struct quota_info *dqopt = sb_dqopt(sb); if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) return -ENOSYS; /* Accounting cannot be turned on while fs is mounted */ flags &= ~(FS_QUOTA_UDQ_ACCT | FS_QUOTA_GDQ_ACCT | FS_QUOTA_PDQ_ACCT); if (!flags) return -EINVAL; for (type = 0; type < MAXQUOTAS; type++) { if (!(flags & qtype_enforce_flag(type))) continue; /* Can't enforce without accounting */ if (!sb_has_quota_usage_enabled(sb, type)) return -EINVAL; ret = dquot_enable(dqopt->files[type], type, dqopt->info[type].dqi_fmt_id, DQUOT_LIMITS_ENABLED); if (ret < 0) goto out_err; } return 0; out_err: /* Backout enforcement enablement we already did */ for (type--; type >= 0; type--) { if (flags & qtype_enforce_flag(type)) dquot_disable(sb, type, DQUOT_LIMITS_ENABLED); } /* Error code translation for better compatibility with XFS */ if (ret == -EBUSY) ret = -EEXIST; return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Jan Kara198100.00%1100.00%
Total198100.00%1100.00%


static int dquot_quota_disable(struct super_block *sb, unsigned int flags) { int ret; int type; struct quota_info *dqopt = sb_dqopt(sb); if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) return -ENOSYS; /* * We don't support turning off accounting via quotactl. In principle * quota infrastructure can do this but filesystems don't expect * userspace to be able to do it. */ if (flags & (FS_QUOTA_UDQ_ACCT | FS_QUOTA_GDQ_ACCT | FS_QUOTA_PDQ_ACCT)) return -EOPNOTSUPP; /* Filter out limits not enabled */ for (type = 0; type < MAXQUOTAS; type++) if (!sb_has_quota_limits_enabled(sb, type)) flags &= ~qtype_enforce_flag(type); /* Nothing left? */ if (!flags) return -EEXIST; for (type = 0; type < MAXQUOTAS; type++) { if (flags & qtype_enforce_flag(type)) { ret = dquot_disable(sb, type, DQUOT_LIMITS_ENABLED); if (ret < 0) goto out_err; } } return 0; out_err: /* Backout enforcement disabling we already did */ for (type--; type >= 0; type--) { if (flags & qtype_enforce_flag(type)) dquot_enable(dqopt->files[type], type, dqopt->info[type].dqi_fmt_id, DQUOT_LIMITS_ENABLED); } return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Jan Kara206100.00%1100.00%
Total206100.00%1100.00%

/* Generic routine for getting common part of quota structure */
static void do_get_dqblk(struct dquot *dquot, struct qc_dqblk *di) { struct mem_dqblk *dm = &dquot->dq_dqb; memset(di, 0, sizeof(*di)); spin_lock(&dquot->dq_dqb_lock); di->d_spc_hardlimit = dm->dqb_bhardlimit; di->d_spc_softlimit = dm->dqb_bsoftlimit; di->d_ino_hardlimit = dm->dqb_ihardlimit; di->d_ino_softlimit = dm->dqb_isoftlimit; di->d_space = dm->dqb_curspace + dm->dqb_rsvspace; di->d_ino_count = dm->dqb_curinodes; di->d_spc_timer = dm->dqb_btime; di->d_ino_timer = dm->dqb_itime; spin_unlock(&dquot->dq_dqb_lock); }

Contributors

PersonTokensPropCommitsCommitProp
Jan Kara8468.29%444.44%
Christoph Hellwig2217.89%111.11%
Andrew Morton129.76%222.22%
Linus Torvalds (pre-git)54.07%222.22%
Total123100.00%9100.00%


int dquot_get_dqblk(struct super_block *sb, struct kqid qid, struct qc_dqblk *di) { struct dquot *dquot; dquot = dqget(sb, qid); if (IS_ERR(dquot)) return PTR_ERR(dquot); do_get_dqblk(dquot, di); dqput(dquot); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Jan Kara3862.30%436.36%
Andrew Morton1219.67%218.18%
Eric W. Biedermann46.56%19.09%
Linus Torvalds (pre-git)34.92%218.18%
Linus Torvalds34.92%19.09%
Christoph Hellwig11.64%19.09%
Total61100.00%11100.00%

EXPORT_SYMBOL(dquot_get_dqblk);
int dquot_get_next_dqblk(struct super_block *sb, struct kqid *qid, struct qc_dqblk *di) { struct dquot *dquot; int err; if (!sb->dq_op->get_next_id) return -ENOSYS; err = sb->dq_op->get_next_id(sb, qid); if (err < 0) return err; dquot = dqget(sb, *qid); if (IS_ERR(dquot)) return PTR_ERR(dquot); do_get_dqblk(dquot, di); dqput(dquot); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Jan Kara101100.00%1100.00%
Total101100.00%1100.00%

EXPORT_SYMBOL(dquot_get_next_dqblk); #define VFS_QC_MASK \ (QC_SPACE | QC_SPC_SOFT | QC_SPC_HARD | \ QC_INO_COUNT | QC_INO_SOFT | QC_INO_HARD | \ QC_SPC_TIMER | QC_INO_TIMER) /* Generic routine for setting common part of quota structure */
static int do_set_dqblk(struct dquot *dquot, struct qc_dqblk *di) { struct mem_dqblk *dm = &dquot->dq_dqb; int check_blim = 0, check_ilim = 0; struct mem_dqinfo *dqi = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_id.type]; if (di->d_fieldmask & ~VFS_QC_MASK) return -EINVAL; if (((di->d_fieldmask & QC_SPC_SOFT) && di->d_spc_softlimit > dqi->dqi_max_spc_limit) || ((di->d_fieldmask & QC_SPC_HARD) && di->d_spc_hardlimit > dqi->dqi_max_spc_limit) || ((di->d_fieldmask & QC_INO_SOFT) && (di->d_ino_softlimit > dqi->dqi_max_ino_limit)) || ((di->d_fieldmask & QC_INO_HARD) && (di->d_ino_hardlimit > dqi->dqi_max_ino_limit))) return -ERANGE; spin_lock(&dquot->dq_dqb_lock); if (di->d_fieldmask & QC_SPACE) { dm->dqb_curspace = di->d_space - dm->dqb_rsvspace; check_blim = 1; set_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags); } if (di->d_fieldmask & QC_SPC_SOFT) dm->dqb_bsoftlimit = di->d_spc_softlimit; if (di->d_fieldmask & QC_SPC_HARD) dm->dqb_bhardlimit = di->d_spc_hardlimit; if (di->d_fieldmask & (QC_SPC_SOFT | QC_SPC_HARD)) { check_blim = 1; set_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags); } if (di->d_fieldmask & QC_INO_COUNT) { dm->dqb_curinodes = di->d_ino_count; check_ilim = 1; set_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags); } if (di->d_fieldmask & QC_INO_SOFT) dm->dqb_isoftlimit = di->d_ino_softlimit; if (di->d_fieldmask & QC_INO_HARD) dm->dqb_ihardlimit = di->d_ino_hardlimit; if (di->d_fieldmask & (QC_INO_SOFT | QC_INO_HARD)) { check_ilim = 1; set_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags); } if (di->d_fieldmask & QC_SPC_TIMER) { dm->dqb_btime = di->d_spc_timer; check_blim = 1; set_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags); } if (di->d_fieldmask & QC_INO_TIMER) { dm->dqb_itime = di->d_ino_timer; check_ilim = 1; set_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags); } if (check_blim) { if (!dm->dqb_bsoftlimit || dm->dqb_curspace + dm->dqb_rsvspace < dm->dqb_bsoftlimit) { dm->dqb_btime = 0; clear_bit(DQ_BLKS_B, &dquot->dq_flags); } else if (!(di->d_fieldmask & QC_SPC_TIMER)) /* Set grace only if user hasn't provided his own... */ dm->dqb_btime = ktime_get_real_seconds() + dqi->dqi_bgrace; } if (check_ilim) { if (!dm->dqb_isoftlimit || dm->dqb_curinodes < dm->dqb_isoftlimit) { dm->dqb_itime = 0; clear_bit(DQ_INODES_B, &dquot->dq_flags); } else if (!(di->d_fieldmask & QC_INO_TIMER)) /* Set grace only if user hasn't provided his own... */ dm->dqb_itime = ktime_get_real_seconds() + dqi->dqi_igrace; } if (dm->dqb_bhardlimit || dm->dqb_bsoftlimit || dm->dqb_ihardlimit || dm->dqb_isoftlimit) clear_bit(DQ_FAKE_B, &dquot->dq_flags); else set_bit(DQ_FAKE_B, &dquot->dq_flags); spin_unlock(&dquot->dq_dqb_lock); mark_dquot_dirty(dquot); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Jan Kara34256.16%1032.26%
Christoph Hellwig8614.12%13.23%
Andrew Perepechko6811.17%26.45%
Andrew Morton487.88%412.90%
Linus Torvalds (pre-git)264.27%516.13%
Art Haas172.79%13.23%
Linus Torvalds40.66%13.23%
zhangyi (F)40.66%13.23%
Mingming Cao40.66%13.23%
Eric W. Biedermann30.49%13.23%
Paul Jackson20.33%13.23%
Arnd Bergmann20.33%13.23%
Andi Kleen20.33%13.23%
Rusty Russell10.16%13.23%
Total609100.00%31100.00%


int dquot_set_dqblk(struct super_block *sb, struct kqid qid, struct qc_dqblk *di) { struct dquot *dquot; int rc; dquot = dqget(sb, qid); if (IS_ERR(dquot)) { rc = PTR_ERR(dquot); goto out; } rc = do_set_dqblk(dquot, di); dqput(dquot); out: return rc; }

Contributors

PersonTokensPropCommitsCommitProp
Jan Kara5675.68%545.45%
Andrew Perepechko68.11%19.09%
Andrew Morton56.76%19.09%
Eric W. Biedermann45.41%19.09%
Christoph Hellwig11.35%19.09%
Linus Torvalds (pre-git)11.35%19.09%
Linus Torvalds11.35%19.09%
Total74100.00%11100.00%

EXPORT_SYMBOL(dquot_set_dqblk); /* Generic routine for getting common part of quota file information */
int dquot_get_state(struct super_block *sb, struct qc_state *state) { struct mem_dqinfo *mi; struct qc_type_state *tstate; struct quota_info *dqopt = sb_dqopt(sb); int type; memset(state, 0, sizeof(*state)); for (type = 0; type < MAXQUOTAS; type++) { if (!sb_has_quota_active(sb, type)) continue; tstate = state->s_state + type; mi = sb_dqopt(sb)->info + type; tstate->flags = QCI_ACCT_ENABLED; spin_lock(&dq_data_lock); if (mi->dqi_flags & DQF_SYS_FILE) tstate->flags |= QCI_SYSFILE; if (mi->dqi_flags & DQF_ROOT_SQUASH) tstate->flags |= QCI_ROOT_SQUASH; if (sb_has_quota_limits_enabled(sb, type)) tstate->flags |= QCI_LIMITS_ENFORCED; tstate->spc_timelimit = mi->dqi_bgrace; tstate->ino_timelimit = mi->dqi_igrace; tstate->ino = dqopt->files[type]->i_ino; tstate->blocks = dqopt->files[type]->i_blocks; tstate->nextents = 1; /* We don't know... */ spin_unlock(&dq_data_lock); } return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Jan Kara17985.65%330.00%
Andrew Morton2311.00%330.00%
Linus Torvalds (pre-git)41.91%330.00%
Al Viro31.44%110.00%
Total209100.00%10100.00%

EXPORT_SYMBOL(dquot_get_state); /* Generic routine for setting common part of quota file information */
int dquot_set_dqinfo(struct super_block *sb, int type, struct qc_info *ii) { struct mem_dqinfo *mi; int err = 0; if ((ii->i_fieldmask & QC_WARNS_MASK) || (ii->i_fieldmask & QC_RT_SPC_TIMER)) return -EINVAL; if (!sb_has_quota_active(sb, type)) return -ESRCH; mi = sb_dqopt(sb)->info + type; if (ii->i_fieldmask & QC_FLAGS) { if ((ii->i_flags & QCI_ROOT_SQUASH && mi->dqi_format->qf_fmt_id != QFMT_VFS_OLD)) return -EINVAL; } spin_lock(&dq_data_lock); if (ii->i_fieldmask & QC_SPC_TIMER) mi->dqi_bgrace = ii->i_spc_timelimit; if (ii->i_fieldmask & QC_INO_TIMER) mi->dqi_igrace = ii->i_ino_timelimit; if (ii->i_fieldmask & QC_FLAGS) { if (ii->i_flags & QCI_ROOT_SQUASH) mi->dqi_flags |= DQF_ROOT_SQUASH; else mi->dqi_flags &= ~DQF_ROOT_SQUASH; } spin_unlock(&dq_data_lock); mark_info_dirty(sb, type); /* Force write to disk */ sb->dq_op->write_info(sb, type); return err; }

Contributors

PersonTokensPropCommitsCommitProp
Jan Kara14671.22%541.67%
Andrew Morton4421.46%216.67%
Linus Torvalds (pre-git)83.90%325.00%
Linus Torvalds62.93%18.33%
Christoph Hellwig10.49%18.33%
Total205100.00%12100.00%

EXPORT_SYMBOL(dquot_set_dqinfo); const struct quotactl_ops dquot_quotactl_sysfile_ops = { .quota_enable = dquot_quota_enable, .quota_disable = dquot_quota_disable, .quota_sync = dquot_quota_sync, .get_state = dquot_get_state, .set_info = dquot_set_dqinfo, .get_dqblk = dquot_get_dqblk, .get_nextdqblk = dquot_get_next_dqblk, .set_dqblk = dquot_set_dqblk }; EXPORT_SYMBOL(dquot_quotactl_sysfile_ops);
static int do_proc_dqstats(struct ctl_table *table, int write, void __user *buffer, size_t *lenp, loff_t *ppos) { unsigned int type = (int *)table->data - dqstats.stat; /* Update global table */ dqstats.stat[type] = percpu_counter_sum_positive(&dqstats.counter[type]); return proc_dointvec(table, write, buffer, lenp, ppos); }

Contributors

PersonTokensPropCommitsCommitProp
Dmitriy Monakhov76100.00%2100.00%
Total76100.00%2100.00%

static struct ctl_table fs_dqstats_table[] = { { .procname = "lookups", .data = &dqstats.stat[DQST_LOOKUPS], .maxlen = sizeof(int), .mode = 0444, .proc_handler = do_proc_dqstats, }, { .procname = "drops", .data = &dqstats.stat[DQST_DROPS], .maxlen = sizeof(int), .mode = 0444, .proc_handler = do_proc_dqstats, }, { .procname = "reads", .data = &dqstats.stat[DQST_READS], .maxlen = sizeof(int), .mode = 0444, .proc_handler = do_proc_dqstats, }, { .procname = "writes", .data = &dqstats.stat[DQST_WRITES], .maxlen = sizeof(int), .mode = 0444, .proc_handler = do_proc_dqstats, }, { .procname = "cache_hits", .data = &dqstats.stat[DQST_CACHE_HITS], .maxlen = sizeof(int), .mode = 0444, .proc_handler = do_proc_dqstats, }, { .procname = "allocated_dquots", .data = &dqstats.stat[DQST_ALLOC_DQUOTS], .maxlen = sizeof(int), .mode = 0444, .proc_handler = do_proc_dqstats, }, { .procname = "free_dquots", .data = &dqstats.stat[DQST_FREE_DQUOTS], .maxlen = sizeof(int), .mode = 0444, .proc_handler = do_proc_dqstats, }, { .procname = "syncs", .data = &dqstats.stat[DQST_SYNCS], .maxlen = sizeof(int), .mode = 0444, .proc_handler = do_proc_dqstats, }, #ifdef CONFIG_PRINT_QUOTA_WARNING { .procname = "warnings", .data = &flag_print_warnings, .maxlen = sizeof(int), .mode = 0644, .proc_handler = proc_dointvec, }, #endif { }, }; static struct ctl_table fs_table[] = { { .procname = "quota", .mode = 0555, .child = fs_dqstats_table, }, { }, }; static struct ctl_table sys_table[] = { { .procname = "fs", .mode = 0555, .child = fs_table, }, { }, };
static int __init dquot_init(void) { int i, ret; unsigned long nr_hash, order; printk(KERN_NOTICE "VFS: Disk quotas %s\n", __DQUOT_VERSION__); register_sysctl_table(sys_table); dquot_cachep = kmem_cache_create("dquot", sizeof(struct dquot), sizeof(unsigned long) * 4, (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| SLAB_MEM_SPREAD|SLAB_PANIC), NULL); order = 0; dquot_hash = (struct hlist_head *)__get_free_pages(GFP_KERNEL, order); if (!dquot_hash) panic("Cannot create dquot hash table"); for (i = 0; i < _DQST_DQSTAT_LAST; i++) { ret = percpu_counter_init(&dqstats.counter[i], 0, GFP_KERNEL); if (ret) panic("Cannot create dquot stat counters"); } /* Find power-of-two hlist_heads which can fit into allocation */ nr_hash = (1UL << order) * PAGE_SIZE / sizeof(struct hlist_head); dq_hash_bits = 0; do { dq_hash_bits++; } while (nr_hash >> dq_hash_bits); dq_hash_bits--; nr_hash = 1UL << dq_hash_bits; dq_hash_mask = nr_hash - 1; for (i = 0; i < nr_hash; i++) INIT_HLIST_HEAD(dquot_hash + i); pr_info("VFS: Dquot-cache hash table entries: %ld (order %ld," " %ld bytes)\n", nr_hash, order, (PAGE_SIZE << order)); if (register_shrinker(&dqcache_shrinker)) panic("Cannot register dquot shrinker"); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Andrew Morton15364.83%736.84%
Dmitriy Monakhov4117.37%210.53%
Jan Kara229.32%315.79%
Tetsuo Handa72.97%15.26%
Paul Jackson41.69%210.53%
Anton Blanchard31.27%15.26%
Rusty Russell31.27%15.26%
Tejun Heo20.85%15.26%
Jia-Ju Bai10.42%15.26%
Total236100.00%19100.00%

fs_initcall(dquot_init);

Overall Contributors

PersonTokensPropCommitsCommitProp
Jan Kara686149.40%10437.68%
Andrew Morton178812.87%207.25%
Linus Torvalds (pre-git)167812.08%227.97%
Dmitriy Monakhov6694.82%82.90%
Christoph Hellwig6344.57%227.97%
Linus Torvalds4403.17%93.26%
Mingming Cao2191.58%31.09%
Eric W. Biedermann2091.50%82.90%
Art Haas1681.21%20.72%
Konstantin Khlebnikov1631.17%20.72%
Niu YaWei1411.02%41.45%
Tahsin Erdogan1210.87%20.72%
Dave Chinner1030.74%51.81%
Al Viro1030.74%113.99%
zhangyi (F)840.60%20.72%
Andrew Perepechko830.60%20.72%
Jiaying Zhang700.50%10.36%
Li Xi640.46%10.36%
Chao Yu450.32%20.72%
Joe Perches260.19%20.72%
Rusty Russell190.14%10.36%
Eric Sandeen160.12%10.36%
Nicholas Piggin150.11%10.36%
Sergey Senozhatsky130.09%10.36%
Ingo Molnar120.09%20.72%
David Howells110.08%20.72%
Adrian Bunk110.08%41.45%
Peter Zijlstra100.07%10.36%
Domen Puncer90.06%10.36%
Steven Whitehouse90.06%10.36%
Arnd Bergmann80.06%10.36%
Tetsuo Handa70.05%10.36%
Eric Sesterhenn / Snakebyte70.05%10.36%
Dave Jones70.05%31.09%
Andi Kleen60.04%10.36%
Mika Kukkonen60.04%10.36%
Paul Jackson60.04%20.72%
Jie Liu50.04%20.72%
Thomas Gleixner50.04%10.36%
Ying Han40.03%10.36%
Akinobu Mita40.03%10.36%
Greg Kroah-Hartman40.03%20.72%
Arnaldo Carvalho de Melo30.02%10.36%
Anton Blanchard30.02%10.36%
Randy Dunlap30.02%10.36%
Glauber de Oliveira Costa30.02%10.36%
Alan Cox30.02%10.36%
Christoph Lameter20.01%10.36%
Tejun Heo20.01%10.36%
Nikolay Borisov20.01%10.36%
Alexey Dobriyan10.01%10.36%
Pavel Emelyanov10.01%10.36%
Paul Gortmaker10.01%10.36%
Jia-Ju Bai10.01%10.36%
Total13888100.00%276100.00%
Directory: fs/quota
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