2739 lines
73 KiB
C
Executable File
2739 lines
73 KiB
C
Executable File
/*
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* Implementation of the diskquota system for the LINUX operating system. QUOTA
|
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* is implemented using the BSD system call interface as the means of
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* communication with the user level. This file contains the generic routines
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* called by the different filesystems on allocation of an inode or block.
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* These routines take care of the administration needed to have a consistent
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* diskquota tracking system. The ideas of both user and group quotas are based
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* on the Melbourne quota system as used on BSD derived systems. The internal
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* implementation is based on one of the several variants of the LINUX
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* inode-subsystem with added complexity of the diskquota system.
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*
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* Author: Marco van Wieringen <mvw@planets.elm.net>
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*
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* Fixes: Dmitry Gorodchanin <pgmdsg@ibi.com>, 11 Feb 96
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*
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* Revised list management to avoid races
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* -- Bill Hawes, <whawes@star.net>, 9/98
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*
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* Fixed races in dquot_transfer(), dqget() and dquot_alloc_...().
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* As the consequence the locking was moved from dquot_decr_...(),
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* dquot_incr_...() to calling functions.
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* invalidate_dquots() now writes modified dquots.
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* Serialized quota_off() and quota_on() for mount point.
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* Fixed a few bugs in grow_dquots().
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* Fixed deadlock in write_dquot() - we no longer account quotas on
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* quota files
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* remove_dquot_ref() moved to inode.c - it now traverses through inodes
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* add_dquot_ref() restarts after blocking
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* Added check for bogus uid and fixed check for group in quotactl.
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* Jan Kara, <jack@suse.cz>, sponsored by SuSE CR, 10-11/99
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*
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* Used struct list_head instead of own list struct
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* Invalidation of referenced dquots is no longer possible
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* Improved free_dquots list management
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* Quota and i_blocks are now updated in one place to avoid races
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* Warnings are now delayed so we won't block in critical section
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* Write updated not to require dquot lock
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* Jan Kara, <jack@suse.cz>, 9/2000
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*
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* Added dynamic quota structure allocation
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* Jan Kara <jack@suse.cz> 12/2000
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*
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* Rewritten quota interface. Implemented new quota format and
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* formats registering.
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* Jan Kara, <jack@suse.cz>, 2001,2002
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*
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* New SMP locking.
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* Jan Kara, <jack@suse.cz>, 10/2002
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*
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* Added journalled quota support, fix lock inversion problems
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* Jan Kara, <jack@suse.cz>, 2003,2004
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*
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* (C) Copyright 1994 - 1997 Marco van Wieringen
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*/
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/fs.h>
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#include <linux/mount.h>
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#include <linux/mm.h>
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#include <linux/time.h>
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#include <linux/types.h>
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#include <linux/string.h>
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#include <linux/fcntl.h>
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#include <linux/stat.h>
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#include <linux/tty.h>
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#include <linux/file.h>
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#include <linux/slab.h>
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#include <linux/sysctl.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/proc_fs.h>
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#include <linux/security.h>
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#include <linux/sched.h>
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#include <linux/kmod.h>
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#include <linux/namei.h>
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#include <linux/capability.h>
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#include <linux/quotaops.h>
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#include "../internal.h" /* ugh */
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#include <linux/uaccess.h>
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/*
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* There are three quota SMP locks. dq_list_lock protects all lists with quotas
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* and quota formats.
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* dq_data_lock protects data from dq_dqb and also mem_dqinfo structures and
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* also guards consistency of dquot->dq_dqb with inode->i_blocks, i_bytes.
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* i_blocks and i_bytes updates itself are guarded by i_lock acquired directly
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* in inode_add_bytes() and inode_sub_bytes(). dq_state_lock protects
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* modifications of quota state (on quotaon and quotaoff) and readers who care
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* about latest values take it as well.
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*
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* The spinlock ordering is hence: dq_data_lock > dq_list_lock > i_lock,
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* dq_list_lock > dq_state_lock
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*
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* Note that some things (eg. sb pointer, type, id) doesn't change during
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* the life of the dquot structure and so needn't to be protected by a lock
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*
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* Operation accessing dquots via inode pointers are protected by dquot_srcu.
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* Operation of reading pointer needs srcu_read_lock(&dquot_srcu), and
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* synchronize_srcu(&dquot_srcu) is called after clearing pointers from
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* inode and before dropping dquot references to avoid use of dquots after
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* they are freed. dq_data_lock is used to serialize the pointer setting and
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* clearing operations.
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* Special care needs to be taken about S_NOQUOTA inode flag (marking that
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* inode is a quota file). Functions adding pointers from inode to dquots have
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* to check this flag under dq_data_lock and then (if S_NOQUOTA is not set) they
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* have to do all pointer modifications before dropping dq_data_lock. This makes
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* sure they cannot race with quotaon which first sets S_NOQUOTA flag and
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* then drops all pointers to dquots from an inode.
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*
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* Each dquot has its dq_lock mutex. Locked dquots might not be referenced
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* from inodes (dquot_alloc_space() and such don't check the dq_lock).
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* Currently dquot is locked only when it is being read to memory (or space for
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* it is being allocated) on the first dqget() and when it is being released on
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* the last dqput(). The allocation and release oparations are serialized by
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* the dq_lock and by checking the use count in dquot_release(). Write
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* operations on dquots don't hold dq_lock as they copy data under dq_data_lock
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* spinlock to internal buffers before writing.
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*
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* Lock ordering (including related VFS locks) is the following:
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* dqonoff_mutex > i_mutex > journal_lock > dquot->dq_lock > dqio_mutex
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* dqonoff_mutex > i_mutex comes from dquot_quota_sync, dquot_enable, etc.
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*/
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static __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_list_lock);
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static __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_state_lock);
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__cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_data_lock);
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EXPORT_SYMBOL(dq_data_lock);
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DEFINE_STATIC_SRCU(dquot_srcu);
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void __quota_error(struct super_block *sb, const char *func,
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const char *fmt, ...)
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{
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if (printk_ratelimit()) {
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va_list args;
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struct va_format vaf;
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va_start(args, fmt);
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vaf.fmt = fmt;
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vaf.va = &args;
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printk(KERN_ERR "Quota error (device %s): %s: %pV\n",
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sb->s_id, func, &vaf);
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va_end(args);
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}
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}
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EXPORT_SYMBOL(__quota_error);
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#if defined(CONFIG_QUOTA_DEBUG) || defined(CONFIG_PRINT_QUOTA_WARNING)
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static char *quotatypes[] = INITQFNAMES;
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#endif
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static struct quota_format_type *quota_formats; /* List of registered formats */
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static struct quota_module_name module_names[] = INIT_QUOTA_MODULE_NAMES;
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/* SLAB cache for dquot structures */
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static struct kmem_cache *dquot_cachep;
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int register_quota_format(struct quota_format_type *fmt)
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{
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spin_lock(&dq_list_lock);
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fmt->qf_next = quota_formats;
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quota_formats = fmt;
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spin_unlock(&dq_list_lock);
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return 0;
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}
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EXPORT_SYMBOL(register_quota_format);
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void unregister_quota_format(struct quota_format_type *fmt)
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{
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struct quota_format_type **actqf;
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spin_lock(&dq_list_lock);
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for (actqf = "a_formats; *actqf && *actqf != fmt;
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actqf = &(*actqf)->qf_next)
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;
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if (*actqf)
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*actqf = (*actqf)->qf_next;
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spin_unlock(&dq_list_lock);
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}
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EXPORT_SYMBOL(unregister_quota_format);
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static struct quota_format_type *find_quota_format(int id)
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{
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struct quota_format_type *actqf;
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spin_lock(&dq_list_lock);
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for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id;
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actqf = actqf->qf_next)
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;
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if (!actqf || !try_module_get(actqf->qf_owner)) {
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int qm;
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spin_unlock(&dq_list_lock);
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for (qm = 0; module_names[qm].qm_fmt_id &&
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module_names[qm].qm_fmt_id != id; qm++)
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;
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if (!module_names[qm].qm_fmt_id ||
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request_module(module_names[qm].qm_mod_name))
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return NULL;
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spin_lock(&dq_list_lock);
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for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id;
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actqf = actqf->qf_next)
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;
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if (actqf && !try_module_get(actqf->qf_owner))
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actqf = NULL;
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}
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spin_unlock(&dq_list_lock);
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return actqf;
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}
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static void put_quota_format(struct quota_format_type *fmt)
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{
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module_put(fmt->qf_owner);
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}
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/*
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* Dquot List Management:
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* The quota code uses three lists for dquot management: the inuse_list,
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* free_dquots, and dquot_hash[] array. A single dquot structure may be
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* on all three lists, depending on its current state.
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*
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* All dquots are placed to the end of inuse_list when first created, and this
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* list is used for invalidate operation, which must look at every dquot.
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*
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* Unused dquots (dq_count == 0) are added to the free_dquots list when freed,
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* and this list is searched whenever we need an available dquot. Dquots are
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* removed from the list as soon as they are used again, and
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* dqstats.free_dquots gives the number of dquots on the list. When
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* dquot is invalidated it's completely released from memory.
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*
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* Dquots with a specific identity (device, type and id) are placed on
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* one of the dquot_hash[] hash chains. The provides an efficient search
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* mechanism to locate a specific dquot.
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*/
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static LIST_HEAD(inuse_list);
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static LIST_HEAD(free_dquots);
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static unsigned int dq_hash_bits, dq_hash_mask;
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static struct hlist_head *dquot_hash;
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struct dqstats dqstats;
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EXPORT_SYMBOL(dqstats);
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static qsize_t inode_get_rsv_space(struct inode *inode);
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static void __dquot_initialize(struct inode *inode, int type);
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static inline unsigned int
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hashfn(const struct super_block *sb, struct kqid qid)
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{
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unsigned int id = from_kqid(&init_user_ns, qid);
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int type = qid.type;
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unsigned long tmp;
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tmp = (((unsigned long)sb>>L1_CACHE_SHIFT) ^ id) * (MAXQUOTAS - type);
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return (tmp + (tmp >> dq_hash_bits)) & dq_hash_mask;
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}
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/*
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* Following list functions expect dq_list_lock to be held
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*/
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static inline void insert_dquot_hash(struct dquot *dquot)
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{
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struct hlist_head *head;
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head = dquot_hash + hashfn(dquot->dq_sb, dquot->dq_id);
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hlist_add_head(&dquot->dq_hash, head);
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}
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static inline void remove_dquot_hash(struct dquot *dquot)
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{
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hlist_del_init(&dquot->dq_hash);
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}
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|
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static struct dquot *find_dquot(unsigned int hashent, struct super_block *sb,
|
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struct kqid qid)
|
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{
|
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struct hlist_node *node;
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struct dquot *dquot;
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hlist_for_each (node, dquot_hash+hashent) {
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dquot = hlist_entry(node, struct dquot, dq_hash);
|
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if (dquot->dq_sb == sb && qid_eq(dquot->dq_id, qid))
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return dquot;
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}
|
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return NULL;
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}
|
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|
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/* Add a dquot to the tail of the free list */
|
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static inline void put_dquot_last(struct dquot *dquot)
|
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{
|
|
list_add_tail(&dquot->dq_free, &free_dquots);
|
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dqstats_inc(DQST_FREE_DQUOTS);
|
|
}
|
|
|
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static inline void remove_free_dquot(struct dquot *dquot)
|
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{
|
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if (list_empty(&dquot->dq_free))
|
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return;
|
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list_del_init(&dquot->dq_free);
|
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dqstats_dec(DQST_FREE_DQUOTS);
|
|
}
|
|
|
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static inline void put_inuse(struct dquot *dquot)
|
|
{
|
|
/* We add to the back of inuse list so we don't have to restart
|
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* when traversing this list and we block */
|
|
list_add_tail(&dquot->dq_inuse, &inuse_list);
|
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dqstats_inc(DQST_ALLOC_DQUOTS);
|
|
}
|
|
|
|
static inline void remove_inuse(struct dquot *dquot)
|
|
{
|
|
dqstats_dec(DQST_ALLOC_DQUOTS);
|
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list_del(&dquot->dq_inuse);
|
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}
|
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/*
|
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* End of list functions needing dq_list_lock
|
|
*/
|
|
|
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static void wait_on_dquot(struct dquot *dquot)
|
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{
|
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mutex_lock(&dquot->dq_lock);
|
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mutex_unlock(&dquot->dq_lock);
|
|
}
|
|
|
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static inline int dquot_dirty(struct dquot *dquot)
|
|
{
|
|
return test_bit(DQ_MOD_B, &dquot->dq_flags);
|
|
}
|
|
|
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static inline int mark_dquot_dirty(struct dquot *dquot)
|
|
{
|
|
return dquot->dq_sb->dq_op->mark_dirty(dquot);
|
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}
|
|
|
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/* Mark dquot dirty in atomic manner, and return it's old dirty flag state */
|
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int dquot_mark_dquot_dirty(struct dquot *dquot)
|
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{
|
|
int ret = 1;
|
|
|
|
/* 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);
|
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ret = 0;
|
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}
|
|
spin_unlock(&dq_list_lock);
|
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return ret;
|
|
}
|
|
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;
|
|
}
|
|
|
|
static inline void dqput_all(struct dquot **dquot)
|
|
{
|
|
unsigned int cnt;
|
|
|
|
for (cnt = 0; cnt < MAXQUOTAS; cnt++)
|
|
dqput(dquot[cnt]);
|
|
}
|
|
|
|
/* This function needs dq_list_lock */
|
|
static inline int clear_dquot_dirty(struct dquot *dquot)
|
|
{
|
|
if (!test_and_clear_bit(DQ_MOD_B, &dquot->dq_flags))
|
|
return 0;
|
|
list_del_init(&dquot->dq_dirty);
|
|
return 1;
|
|
}
|
|
|
|
void mark_info_dirty(struct super_block *sb, int type)
|
|
{
|
|
set_bit(DQF_INFO_DIRTY_B, &sb_dqopt(sb)->info[type].dqi_flags);
|
|
}
|
|
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);
|
|
mutex_lock(&dqopt->dqio_mutex);
|
|
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;
|
|
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;
|
|
}
|
|
}
|
|
set_bit(DQ_ACTIVE_B, &dquot->dq_flags);
|
|
out_iolock:
|
|
mutex_unlock(&dqopt->dqio_mutex);
|
|
mutex_unlock(&dquot->dq_lock);
|
|
return ret;
|
|
}
|
|
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(&dqopt->dqio_mutex);
|
|
spin_lock(&dq_list_lock);
|
|
if (!clear_dquot_dirty(dquot)) {
|
|
spin_unlock(&dq_list_lock);
|
|
goto out_sem;
|
|
}
|
|
spin_unlock(&dq_list_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_sem:
|
|
mutex_unlock(&dqopt->dqio_mutex);
|
|
return ret;
|
|
}
|
|
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;
|
|
mutex_lock(&dqopt->dqio_mutex);
|
|
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);
|
|
mutex_unlock(&dqopt->dqio_mutex);
|
|
out_dqlock:
|
|
mutex_unlock(&dquot->dq_lock);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(dquot_release);
|
|
|
|
void dquot_destroy(struct dquot *dquot)
|
|
{
|
|
kmem_cache_free(dquot_cachep, dquot);
|
|
}
|
|
EXPORT_SYMBOL(dquot_destroy);
|
|
|
|
static inline void do_destroy_dquot(struct dquot *dquot)
|
|
{
|
|
dquot->dq_sb->dq_op->destroy_dquot(dquot);
|
|
}
|
|
|
|
/* 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)) {
|
|
DEFINE_WAIT(wait);
|
|
|
|
dqgrab(dquot);
|
|
prepare_to_wait(&dquot->dq_wait_unused, &wait,
|
|
TASK_UNINTERRUPTIBLE);
|
|
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.
|
|
*/
|
|
if (atomic_read(&dquot->dq_count) > 1)
|
|
schedule();
|
|
finish_wait(&dquot->dq_wait_unused, &wait);
|
|
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);
|
|
}
|
|
|
|
/* 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;
|
|
|
|
mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
|
|
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);
|
|
mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
|
|
return ret;
|
|
}
|
|
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;
|
|
|
|
mutex_lock(&dqopt->dqonoff_mutex);
|
|
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);
|
|
/* Dirty and inactive can be only bad dquot... */
|
|
if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) {
|
|
clear_dquot_dirty(dquot);
|
|
continue;
|
|
}
|
|
/* 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 (!ret && err)
|
|
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);
|
|
mutex_unlock(&dqopt->dqonoff_mutex);
|
|
|
|
return ret;
|
|
}
|
|
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.
|
|
*/
|
|
mutex_lock(&dqopt->dqonoff_mutex);
|
|
for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
|
|
if (type != -1 && cnt != type)
|
|
continue;
|
|
if (!sb_has_quota_active(sb, cnt))
|
|
continue;
|
|
mutex_lock(&dqopt->files[cnt]->i_mutex);
|
|
truncate_inode_pages(&dqopt->files[cnt]->i_data, 0);
|
|
mutex_unlock(&dqopt->files[cnt]->i_mutex);
|
|
}
|
|
mutex_unlock(&dqopt->dqonoff_mutex);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(dquot_quota_sync);
|
|
|
|
static unsigned long
|
|
dqcache_shrink_scan(struct shrinker *shrink, struct shrink_control *sc)
|
|
{
|
|
struct list_head *head;
|
|
struct dquot *dquot;
|
|
unsigned long freed = 0;
|
|
|
|
spin_lock(&dq_list_lock);
|
|
head = free_dquots.prev;
|
|
while (head != &free_dquots && sc->nr_to_scan) {
|
|
dquot = list_entry(head, struct dquot, dq_free);
|
|
remove_dquot_hash(dquot);
|
|
remove_free_dquot(dquot);
|
|
remove_inuse(dquot);
|
|
do_destroy_dquot(dquot);
|
|
sc->nr_to_scan--;
|
|
freed++;
|
|
head = free_dquots.prev;
|
|
}
|
|
spin_unlock(&dq_list_lock);
|
|
return freed;
|
|
}
|
|
|
|
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]));
|
|
}
|
|
|
|
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->dq_wait_unused);
|
|
spin_unlock(&dq_list_lock);
|
|
return;
|
|
}
|
|
/* Need to release dquot? */
|
|
if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && 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
|
|
*/
|
|
spin_lock(&dq_list_lock);
|
|
clear_dquot_dirty(dquot);
|
|
spin_unlock(&dq_list_lock);
|
|
}
|
|
goto we_slept;
|
|
}
|
|
/* Clear flag in case dquot was inactive (something bad happened) */
|
|
clear_dquot_dirty(dquot);
|
|
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);
|
|
}
|
|
EXPORT_SYMBOL(dqput);
|
|
|
|
struct dquot *dquot_alloc(struct super_block *sb, int type)
|
|
{
|
|
return kmem_cache_zalloc(dquot_cachep, GFP_NOFS);
|
|
}
|
|
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);
|
|
init_waitqueue_head(&dquot->dq_wait_unused);
|
|
dquot->dq_sb = sb;
|
|
dquot->dq_id = make_kqid_invalid(type);
|
|
atomic_set(&dquot->dq_count, 1);
|
|
|
|
return dquot;
|
|
}
|
|
|
|
/*
|
|
* 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 = NULL, *empty = NULL;
|
|
|
|
if (!sb_has_quota_active(sb, qid.type))
|
|
return NULL;
|
|
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);
|
|
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) &&
|
|
sb->dq_op->acquire_dquot(dquot) < 0) {
|
|
dqput(dquot);
|
|
dquot = NULL;
|
|
goto out;
|
|
}
|
|
#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;
|
|
}
|
|
EXPORT_SYMBOL(dqget);
|
|
|
|
static int dqinit_needed(struct inode *inode, int type)
|
|
{
|
|
int cnt;
|
|
|
|
if (IS_NOQUOTA(inode))
|
|
return 0;
|
|
if (type != -1)
|
|
return !inode->i_dquot[type];
|
|
for (cnt = 0; cnt < MAXQUOTAS; cnt++)
|
|
if (!inode->i_dquot[cnt])
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
/* This routine is guarded by dqonoff_mutex mutex */
|
|
static void add_dquot_ref(struct super_block *sb, int type)
|
|
{
|
|
struct inode *inode, *old_inode = NULL;
|
|
#ifdef CONFIG_QUOTA_DEBUG
|
|
int reserved = 0;
|
|
#endif
|
|
|
|
spin_lock(&inode_sb_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(&inode_sb_list_lock);
|
|
|
|
#ifdef CONFIG_QUOTA_DEBUG
|
|
if (unlikely(inode_get_rsv_space(inode) > 0))
|
|
reserved = 1;
|
|
#endif
|
|
iput(old_inode);
|
|
__dquot_initialize(inode, type);
|
|
|
|
/*
|
|
* We hold a reference to 'inode' so it couldn't have been
|
|
* removed from s_inodes list while we dropped the
|
|
* inode_sb_list_lock We cannot iput the inode now as we can be
|
|
* holding the last reference and we cannot iput it under
|
|
* inode_sb_list_lock. So we keep the reference and iput it
|
|
* later.
|
|
*/
|
|
old_inode = inode;
|
|
spin_lock(&inode_sb_list_lock);
|
|
}
|
|
spin_unlock(&inode_sb_list_lock);
|
|
iput(old_inode);
|
|
|
|
#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
|
|
}
|
|
|
|
/*
|
|
* 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 *dquot = inode->i_dquot[type];
|
|
|
|
inode->i_dquot[type] = NULL;
|
|
if (!dquot)
|
|
return;
|
|
|
|
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);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* 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);
|
|
}
|
|
}
|
|
|
|
static void remove_dquot_ref(struct super_block *sb, int type,
|
|
struct list_head *tofree_head)
|
|
{
|
|
struct inode *inode;
|
|
int reserved = 0;
|
|
|
|
spin_lock(&inode_sb_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(&inode_sb_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
|
|
}
|
|
|
|
/* 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);
|
|
}
|
|
}
|
|
|
|
static inline void dquot_incr_inodes(struct dquot *dquot, qsize_t number)
|
|
{
|
|
dquot->dq_dqb.dqb_curinodes += number;
|
|
}
|
|
|
|
static inline void dquot_incr_space(struct dquot *dquot, qsize_t number)
|
|
{
|
|
dquot->dq_dqb.dqb_curspace += number;
|
|
}
|
|
|
|
static inline void dquot_resv_space(struct dquot *dquot, qsize_t number)
|
|
{
|
|
dquot->dq_dqb.dqb_rsvspace += number;
|
|
}
|
|
|
|
/*
|
|
* Claim reserved quota space
|
|
*/
|
|
static void dquot_claim_reserved_space(struct dquot *dquot, qsize_t number)
|
|
{
|
|
if (dquot->dq_dqb.dqb_rsvspace < number) {
|
|
WARN_ON_ONCE(1);
|
|
number = dquot->dq_dqb.dqb_rsvspace;
|
|
}
|
|
dquot->dq_dqb.dqb_curspace += number;
|
|
dquot->dq_dqb.dqb_rsvspace -= number;
|
|
}
|
|
|
|
static void dquot_reclaim_reserved_space(struct dquot *dquot, qsize_t number)
|
|
{
|
|
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;
|
|
}
|
|
|
|
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;
|
|
}
|
|
}
|
|
|
|
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 = (time_t) 0;
|
|
clear_bit(DQ_INODES_B, &dquot->dq_flags);
|
|
}
|
|
|
|
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_bsoftlimit)
|
|
dquot->dq_dqb.dqb_btime = (time_t) 0;
|
|
clear_bit(DQ_BLKS_B, &dquot->dq_flags);
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
#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: /* Never taken... Just make gcc happy */
|
|
return 0;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* 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);
|
|
}
|
|
#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;
|
|
}
|
|
|
|
/*
|
|
* 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);
|
|
}
|
|
}
|
|
|
|
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 & V1_DQF_RSQUASH));
|
|
}
|
|
|
|
/* needs dq_data_lock */
|
|
static int check_idq(struct dquot *dquot, qsize_t inodes,
|
|
struct dquot_warn *warn)
|
|
{
|
|
qsize_t 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))
|
|
return 0;
|
|
|
|
if (dquot->dq_dqb.dqb_ihardlimit &&
|
|
newinodes > dquot->dq_dqb.dqb_ihardlimit &&
|
|
!ignore_hardlimit(dquot)) {
|
|
prepare_warning(warn, dquot, QUOTA_NL_IHARDWARN);
|
|
return -EDQUOT;
|
|
}
|
|
|
|
if (dquot->dq_dqb.dqb_isoftlimit &&
|
|
newinodes > dquot->dq_dqb.dqb_isoftlimit &&
|
|
dquot->dq_dqb.dqb_itime &&
|
|
get_seconds() >= dquot->dq_dqb.dqb_itime &&
|
|
!ignore_hardlimit(dquot)) {
|
|
prepare_warning(warn, dquot, QUOTA_NL_ISOFTLONGWARN);
|
|
return -EDQUOT;
|
|
}
|
|
|
|
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 = get_seconds() +
|
|
sb_dqopt(dquot->dq_sb)->info[dquot->dq_id.type].dqi_igrace;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* needs dq_data_lock */
|
|
static int check_bdq(struct dquot *dquot, qsize_t space, int prealloc,
|
|
struct dquot_warn *warn)
|
|
{
|
|
qsize_t tspace;
|
|
struct super_block *sb = dquot->dq_sb;
|
|
|
|
if (!sb_has_quota_limits_enabled(sb, dquot->dq_id.type) ||
|
|
test_bit(DQ_FAKE_B, &dquot->dq_flags))
|
|
return 0;
|
|
|
|
tspace = dquot->dq_dqb.dqb_curspace + dquot->dq_dqb.dqb_rsvspace
|
|
+ space;
|
|
|
|
if (dquot->dq_dqb.dqb_bhardlimit &&
|
|
tspace > dquot->dq_dqb.dqb_bhardlimit &&
|
|
!ignore_hardlimit(dquot)) {
|
|
if (!prealloc)
|
|
prepare_warning(warn, dquot, QUOTA_NL_BHARDWARN);
|
|
return -EDQUOT;
|
|
}
|
|
|
|
if (dquot->dq_dqb.dqb_bsoftlimit &&
|
|
tspace > dquot->dq_dqb.dqb_bsoftlimit &&
|
|
dquot->dq_dqb.dqb_btime &&
|
|
get_seconds() >= dquot->dq_dqb.dqb_btime &&
|
|
!ignore_hardlimit(dquot)) {
|
|
if (!prealloc)
|
|
prepare_warning(warn, dquot, QUOTA_NL_BSOFTLONGWARN);
|
|
return -EDQUOT;
|
|
}
|
|
|
|
if (dquot->dq_dqb.dqb_bsoftlimit &&
|
|
tspace > dquot->dq_dqb.dqb_bsoftlimit &&
|
|
dquot->dq_dqb.dqb_btime == 0) {
|
|
if (!prealloc) {
|
|
prepare_warning(warn, dquot, QUOTA_NL_BSOFTWARN);
|
|
dquot->dq_dqb.dqb_btime = get_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
|
|
*/
|
|
return -EDQUOT;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
static int info_bdq_free(struct dquot *dquot, qsize_t space)
|
|
{
|
|
if (test_bit(DQ_FAKE_B, &dquot->dq_flags) ||
|
|
dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit)
|
|
return QUOTA_NL_NOWARN;
|
|
|
|
if (dquot->dq_dqb.dqb_curspace - space <= dquot->dq_dqb.dqb_bsoftlimit)
|
|
return QUOTA_NL_BSOFTBELOW;
|
|
if (dquot->dq_dqb.dqb_curspace >= dquot->dq_dqb.dqb_bhardlimit &&
|
|
dquot->dq_dqb.dqb_curspace - space < dquot->dq_dqb.dqb_bhardlimit)
|
|
return QUOTA_NL_BHARDBELOW;
|
|
return QUOTA_NL_NOWARN;
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
/*
|
|
* 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 void __dquot_initialize(struct inode *inode, int type)
|
|
{
|
|
int cnt, init_needed = 0;
|
|
struct dquot *got[MAXQUOTAS];
|
|
struct super_block *sb = inode->i_sb;
|
|
qsize_t rsv;
|
|
|
|
if (!dquot_active(inode))
|
|
return;
|
|
|
|
/* First get references to structures we might need. */
|
|
for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
|
|
struct kqid qid;
|
|
got[cnt] = NULL;
|
|
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 (inode->i_dquot[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;
|
|
}
|
|
got[cnt] = dqget(sb, qid);
|
|
}
|
|
|
|
/* All required i_dquot has been initialized */
|
|
if (!init_needed)
|
|
return;
|
|
|
|
spin_lock(&dq_data_lock);
|
|
if (IS_NOQUOTA(inode))
|
|
goto out_err;
|
|
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 (!inode->i_dquot[cnt]) {
|
|
inode->i_dquot[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))
|
|
dquot_resv_space(inode->i_dquot[cnt], rsv);
|
|
}
|
|
}
|
|
out_err:
|
|
spin_unlock(&dq_data_lock);
|
|
/* Drop unused references */
|
|
dqput_all(got);
|
|
}
|
|
|
|
void dquot_initialize(struct inode *inode)
|
|
{
|
|
__dquot_initialize(inode, -1);
|
|
}
|
|
EXPORT_SYMBOL(dquot_initialize);
|
|
|
|
/*
|
|
* 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 *put[MAXQUOTAS];
|
|
|
|
spin_lock(&dq_data_lock);
|
|
for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
|
|
put[cnt] = inode->i_dquot[cnt];
|
|
inode->i_dquot[cnt] = NULL;
|
|
}
|
|
spin_unlock(&dq_data_lock);
|
|
dqput_all(put);
|
|
}
|
|
|
|
void dquot_drop(struct inode *inode)
|
|
{
|
|
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.
|
|
*/
|
|
for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
|
|
if (inode->i_dquot[cnt])
|
|
break;
|
|
}
|
|
|
|
if (cnt < MAXQUOTAS)
|
|
__dquot_drop(inode);
|
|
}
|
|
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);
|
|
}
|
|
|
|
void inode_add_rsv_space(struct inode *inode, qsize_t number)
|
|
{
|
|
spin_lock(&inode->i_lock);
|
|
*inode_reserved_space(inode) += number;
|
|
spin_unlock(&inode->i_lock);
|
|
}
|
|
EXPORT_SYMBOL(inode_add_rsv_space);
|
|
|
|
void inode_claim_rsv_space(struct inode *inode, qsize_t number)
|
|
{
|
|
spin_lock(&inode->i_lock);
|
|
*inode_reserved_space(inode) -= number;
|
|
__inode_add_bytes(inode, number);
|
|
spin_unlock(&inode->i_lock);
|
|
}
|
|
EXPORT_SYMBOL(inode_claim_rsv_space);
|
|
|
|
void inode_reclaim_rsv_space(struct inode *inode, qsize_t number)
|
|
{
|
|
spin_lock(&inode->i_lock);
|
|
*inode_reserved_space(inode) += number;
|
|
__inode_sub_bytes(inode, number);
|
|
spin_unlock(&inode->i_lock);
|
|
}
|
|
EXPORT_SYMBOL(inode_reclaim_rsv_space);
|
|
|
|
void inode_sub_rsv_space(struct inode *inode, qsize_t number)
|
|
{
|
|
spin_lock(&inode->i_lock);
|
|
*inode_reserved_space(inode) -= number;
|
|
spin_unlock(&inode->i_lock);
|
|
}
|
|
EXPORT_SYMBOL(inode_sub_rsv_space);
|
|
|
|
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_reserved_space(inode);
|
|
spin_unlock(&inode->i_lock);
|
|
return ret;
|
|
}
|
|
|
|
static void inode_incr_space(struct inode *inode, qsize_t number,
|
|
int reserve)
|
|
{
|
|
if (reserve)
|
|
inode_add_rsv_space(inode, number);
|
|
else
|
|
inode_add_bytes(inode, number);
|
|
}
|
|
|
|
static void inode_decr_space(struct inode *inode, qsize_t number, int reserve)
|
|
{
|
|
if (reserve)
|
|
inode_sub_rsv_space(inode, number);
|
|
else
|
|
inode_sub_bytes(inode, number);
|
|
}
|
|
|
|
/*
|
|
* 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];
|
|
struct dquot **dquots = inode->i_dquot;
|
|
int reserve = flags & DQUOT_SPACE_RESERVE;
|
|
|
|
if (!dquot_active(inode)) {
|
|
inode_incr_space(inode, number, reserve);
|
|
goto out;
|
|
}
|
|
|
|
for (cnt = 0; cnt < MAXQUOTAS; cnt++)
|
|
warn[cnt].w_type = QUOTA_NL_NOWARN;
|
|
|
|
index = srcu_read_lock(&dquot_srcu);
|
|
spin_lock(&dq_data_lock);
|
|
for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
|
|
if (!dquots[cnt])
|
|
continue;
|
|
ret = check_bdq(dquots[cnt], number,
|
|
!(flags & DQUOT_SPACE_WARN), &warn[cnt]);
|
|
if (ret && !(flags & DQUOT_SPACE_NOFAIL)) {
|
|
spin_unlock(&dq_data_lock);
|
|
goto out_flush_warn;
|
|
}
|
|
}
|
|
for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
|
|
if (!dquots[cnt])
|
|
continue;
|
|
if (reserve)
|
|
dquot_resv_space(dquots[cnt], number);
|
|
else
|
|
dquot_incr_space(dquots[cnt], number);
|
|
}
|
|
inode_incr_space(inode, number, reserve);
|
|
spin_unlock(&dq_data_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;
|
|
}
|
|
EXPORT_SYMBOL(__dquot_alloc_space);
|
|
|
|
/*
|
|
* This operation can block, but only after everything is updated
|
|
*/
|
|
int dquot_alloc_inode(const struct inode *inode)
|
|
{
|
|
int cnt, ret = 0, index;
|
|
struct dquot_warn warn[MAXQUOTAS];
|
|
struct dquot * const *dquots = inode->i_dquot;
|
|
|
|
if (!dquot_active(inode))
|
|
return 0;
|
|
for (cnt = 0; cnt < MAXQUOTAS; cnt++)
|
|
warn[cnt].w_type = QUOTA_NL_NOWARN;
|
|
|
|
index = srcu_read_lock(&dquot_srcu);
|
|
spin_lock(&dq_data_lock);
|
|
for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
|
|
if (!dquots[cnt])
|
|
continue;
|
|
ret = check_idq(dquots[cnt], 1, &warn[cnt]);
|
|
if (ret)
|
|
goto warn_put_all;
|
|
}
|
|
|
|
for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
|
|
if (!dquots[cnt])
|
|
continue;
|
|
dquot_incr_inodes(dquots[cnt], 1);
|
|
}
|
|
|
|
warn_put_all:
|
|
spin_unlock(&dq_data_lock);
|
|
if (ret == 0)
|
|
mark_all_dquot_dirty(dquots);
|
|
srcu_read_unlock(&dquot_srcu, index);
|
|
flush_warnings(warn);
|
|
return ret;
|
|
}
|
|
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)
|
|
{
|
|
int cnt, index;
|
|
|
|
if (!dquot_active(inode)) {
|
|
inode_claim_rsv_space(inode, number);
|
|
return 0;
|
|
}
|
|
|
|
index = srcu_read_lock(&dquot_srcu);
|
|
spin_lock(&dq_data_lock);
|
|
/* Claim reserved quotas to allocated quotas */
|
|
for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
|
|
if (inode->i_dquot[cnt])
|
|
dquot_claim_reserved_space(inode->i_dquot[cnt],
|
|
number);
|
|
}
|
|
/* Update inode bytes */
|
|
inode_claim_rsv_space(inode, number);
|
|
spin_unlock(&dq_data_lock);
|
|
mark_all_dquot_dirty(inode->i_dquot);
|
|
srcu_read_unlock(&dquot_srcu, index);
|
|
return 0;
|
|
}
|
|
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)
|
|
{
|
|
int cnt, index;
|
|
|
|
if (!dquot_active(inode)) {
|
|
inode_reclaim_rsv_space(inode, number);
|
|
return;
|
|
}
|
|
|
|
index = srcu_read_lock(&dquot_srcu);
|
|
spin_lock(&dq_data_lock);
|
|
/* Claim reserved quotas to allocated quotas */
|
|
for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
|
|
if (inode->i_dquot[cnt])
|
|
dquot_reclaim_reserved_space(inode->i_dquot[cnt],
|
|
number);
|
|
}
|
|
/* Update inode bytes */
|
|
inode_reclaim_rsv_space(inode, number);
|
|
spin_unlock(&dq_data_lock);
|
|
mark_all_dquot_dirty(inode->i_dquot);
|
|
srcu_read_unlock(&dquot_srcu, index);
|
|
return;
|
|
}
|
|
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 = inode->i_dquot;
|
|
int reserve = flags & DQUOT_SPACE_RESERVE, index;
|
|
|
|
if (!dquot_active(inode)) {
|
|
inode_decr_space(inode, number, reserve);
|
|
return;
|
|
}
|
|
|
|
index = srcu_read_lock(&dquot_srcu);
|
|
spin_lock(&dq_data_lock);
|
|
for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
|
|
int wtype;
|
|
|
|
warn[cnt].w_type = QUOTA_NL_NOWARN;
|
|
if (!dquots[cnt])
|
|
continue;
|
|
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);
|
|
}
|
|
inode_decr_space(inode, number, reserve);
|
|
spin_unlock(&dq_data_lock);
|
|
|
|
if (reserve)
|
|
goto out_unlock;
|
|
mark_all_dquot_dirty(dquots);
|
|
out_unlock:
|
|
srcu_read_unlock(&dquot_srcu, index);
|
|
flush_warnings(warn);
|
|
}
|
|
EXPORT_SYMBOL(__dquot_free_space);
|
|
|
|
/*
|
|
* This operation can block, but only after everything is updated
|
|
*/
|
|
void dquot_free_inode(const struct inode *inode)
|
|
{
|
|
unsigned int cnt;
|
|
struct dquot_warn warn[MAXQUOTAS];
|
|
struct dquot * const *dquots = inode->i_dquot;
|
|
int index;
|
|
|
|
if (!dquot_active(inode))
|
|
return;
|
|
|
|
index = srcu_read_lock(&dquot_srcu);
|
|
spin_lock(&dq_data_lock);
|
|
for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
|
|
int wtype;
|
|
|
|
warn[cnt].w_type = QUOTA_NL_NOWARN;
|
|
if (!dquots[cnt])
|
|
continue;
|
|
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(&dq_data_lock);
|
|
mark_all_dquot_dirty(dquots);
|
|
srcu_read_unlock(&dquot_srcu, index);
|
|
flush_warnings(warn);
|
|
}
|
|
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 space, cur_space;
|
|
qsize_t rsv_space = 0;
|
|
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;
|
|
/* 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);
|
|
if (IS_NOQUOTA(inode)) { /* File without quota accounting? */
|
|
spin_unlock(&dq_data_lock);
|
|
return 0;
|
|
}
|
|
cur_space = inode_get_bytes(inode);
|
|
rsv_space = inode_get_rsv_space(inode);
|
|
space = cur_space + rsv_space;
|
|
/* Build the transfer_from list and check the limits */
|
|
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] = inode->i_dquot[cnt];
|
|
ret = check_idq(transfer_to[cnt], 1, &warn_to[cnt]);
|
|
if (ret)
|
|
goto over_quota;
|
|
ret = check_bdq(transfer_to[cnt], space, 0, &warn_to[cnt]);
|
|
if (ret)
|
|
goto over_quota;
|
|
}
|
|
|
|
/*
|
|
* Finally perform the needed transfer from transfer_from to transfer_to
|
|
*/
|
|
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;
|
|
wtype = info_idq_free(transfer_from[cnt], 1);
|
|
if (wtype != QUOTA_NL_NOWARN)
|
|
prepare_warning(&warn_from_inodes[cnt],
|
|
transfer_from[cnt], wtype);
|
|
wtype = info_bdq_free(transfer_from[cnt], space);
|
|
if (wtype != QUOTA_NL_NOWARN)
|
|
prepare_warning(&warn_from_space[cnt],
|
|
transfer_from[cnt], wtype);
|
|
dquot_decr_inodes(transfer_from[cnt], 1);
|
|
dquot_decr_space(transfer_from[cnt], cur_space);
|
|
dquot_free_reserved_space(transfer_from[cnt],
|
|
rsv_space);
|
|
}
|
|
|
|
dquot_incr_inodes(transfer_to[cnt], 1);
|
|
dquot_incr_space(transfer_to[cnt], cur_space);
|
|
dquot_resv_space(transfer_to[cnt], rsv_space);
|
|
|
|
inode->i_dquot[cnt] = transfer_to[cnt];
|
|
}
|
|
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:
|
|
spin_unlock(&dq_data_lock);
|
|
flush_warnings(warn_to);
|
|
return ret;
|
|
}
|
|
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 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))
|
|
transfer_to[USRQUOTA] = dqget(sb, make_kqid_uid(iattr->ia_uid));
|
|
if (iattr->ia_valid & ATTR_GID && !gid_eq(iattr->ia_gid, inode->i_gid))
|
|
transfer_to[GRPQUOTA] = dqget(sb, make_kqid_gid(iattr->ia_gid));
|
|
|
|
ret = __dquot_transfer(inode, transfer_to);
|
|
dqput_all(transfer_to);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(dquot_transfer);
|
|
|
|
/*
|
|
* Write info of quota file to disk
|
|
*/
|
|
int dquot_commit_info(struct super_block *sb, int type)
|
|
{
|
|
int ret;
|
|
struct quota_info *dqopt = sb_dqopt(sb);
|
|
|
|
mutex_lock(&dqopt->dqio_mutex);
|
|
ret = dqopt->ops[type]->write_file_info(sb, type);
|
|
mutex_unlock(&dqopt->dqio_mutex);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(dquot_commit_info);
|
|
|
|
/*
|
|
* 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,
|
|
};
|
|
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))
|
|
dquot_initialize(inode);
|
|
return error;
|
|
}
|
|
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];
|
|
|
|
/* 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;
|
|
|
|
/* We need to serialize quota_off() for device */
|
|
mutex_lock(&dqopt->dqonoff_mutex);
|
|
|
|
/*
|
|
* 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)) {
|
|
mutex_unlock(&dqopt->dqonoff_mutex);
|
|
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;
|
|
}
|
|
mutex_unlock(&dqopt->dqonoff_mutex);
|
|
|
|
/* 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++)
|
|
if (toputinode[cnt]) {
|
|
mutex_lock(&dqopt->dqonoff_mutex);
|
|
/* If quota was reenabled in the meantime, we have
|
|
* nothing to do */
|
|
if (!sb_has_quota_loaded(sb, cnt)) {
|
|
mutex_lock(&toputinode[cnt]->i_mutex);
|
|
toputinode[cnt]->i_flags &= ~(S_IMMUTABLE |
|
|
S_NOATIME | S_NOQUOTA);
|
|
truncate_inode_pages(&toputinode[cnt]->i_data,
|
|
0);
|
|
mutex_unlock(&toputinode[cnt]->i_mutex);
|
|
mark_inode_dirty_sync(toputinode[cnt]);
|
|
}
|
|
mutex_unlock(&dqopt->dqonoff_mutex);
|
|
}
|
|
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;
|
|
}
|
|
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);
|
|
}
|
|
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;
|
|
int oldflags = -1;
|
|
|
|
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) {
|
|
error = -EINVAL;
|
|
goto out_fmt;
|
|
}
|
|
/* Usage always has to be set... */
|
|
if (!(flags & DQUOT_USAGE_ENABLED)) {
|
|
error = -EINVAL;
|
|
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);
|
|
}
|
|
mutex_lock(&dqopt->dqonoff_mutex);
|
|
if (sb_has_quota_loaded(sb, type)) {
|
|
error = -EBUSY;
|
|
goto out_lock;
|
|
}
|
|
|
|
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. */
|
|
mutex_lock(&inode->i_mutex);
|
|
oldflags = inode->i_flags & (S_NOATIME | S_IMMUTABLE |
|
|
S_NOQUOTA);
|
|
inode->i_flags |= S_NOQUOTA | S_NOATIME | S_IMMUTABLE;
|
|
mutex_unlock(&inode->i_mutex);
|
|
/*
|
|
* 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_lock;
|
|
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);
|
|
mutex_lock(&dqopt->dqio_mutex);
|
|
error = dqopt->ops[type]->read_file_info(sb, type);
|
|
if (error < 0) {
|
|
mutex_unlock(&dqopt->dqio_mutex);
|
|
goto out_file_init;
|
|
}
|
|
if (dqopt->flags & DQUOT_QUOTA_SYS_FILE)
|
|
dqopt->info[type].dqi_flags |= DQF_SYS_FILE;
|
|
mutex_unlock(&dqopt->dqio_mutex);
|
|
spin_lock(&dq_state_lock);
|
|
dqopt->flags |= dquot_state_flag(flags, type);
|
|
spin_unlock(&dq_state_lock);
|
|
|
|
add_dquot_ref(sb, type);
|
|
mutex_unlock(&dqopt->dqonoff_mutex);
|
|
|
|
return 0;
|
|
|
|
out_file_init:
|
|
dqopt->files[type] = NULL;
|
|
iput(inode);
|
|
out_lock:
|
|
if (oldflags != -1) {
|
|
mutex_lock(&inode->i_mutex);
|
|
/* Set the flags back (in the case of accidental quotaon()
|
|
* on a wrong file we don't want to mess up the flags) */
|
|
inode->i_flags &= ~(S_NOATIME | S_NOQUOTA | S_IMMUTABLE);
|
|
inode->i_flags |= oldflags;
|
|
mutex_unlock(&inode->i_mutex);
|
|
}
|
|
mutex_unlock(&dqopt->dqonoff_mutex);
|
|
out_fmt:
|
|
put_quota_format(fmt);
|
|
|
|
return error;
|
|
}
|
|
|
|
/* 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;
|
|
|
|
for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
|
|
if (type != -1 && cnt != type)
|
|
continue;
|
|
|
|
mutex_lock(&dqopt->dqonoff_mutex);
|
|
if (!sb_has_quota_suspended(sb, cnt)) {
|
|
mutex_unlock(&dqopt->dqonoff_mutex);
|
|
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);
|
|
mutex_unlock(&dqopt->dqonoff_mutex);
|
|
|
|
flags = dquot_generic_flag(flags, cnt);
|
|
ret = vfs_load_quota_inode(inode, cnt,
|
|
dqopt->info[cnt].dqi_fmt_id, flags);
|
|
iput(inode);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(dquot_resume);
|
|
|
|
int dquot_quota_on(struct super_block *sb, int type, int format_id,
|
|
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(path->dentry->d_inode, type,
|
|
format_id, DQUOT_USAGE_ENABLED |
|
|
DQUOT_LIMITS_ENABLED);
|
|
return error;
|
|
}
|
|
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)
|
|
{
|
|
int ret = 0;
|
|
struct super_block *sb = inode->i_sb;
|
|
struct quota_info *dqopt = sb_dqopt(sb);
|
|
|
|
/* Just unsuspend quotas? */
|
|
BUG_ON(flags & DQUOT_SUSPENDED);
|
|
|
|
if (!flags)
|
|
return 0;
|
|
/* Just updating flags needed? */
|
|
if (sb_has_quota_loaded(sb, type)) {
|
|
mutex_lock(&dqopt->dqonoff_mutex);
|
|
/* Now do a reliable test... */
|
|
if (!sb_has_quota_loaded(sb, type)) {
|
|
mutex_unlock(&dqopt->dqonoff_mutex);
|
|
goto load_quota;
|
|
}
|
|
if (flags & DQUOT_USAGE_ENABLED &&
|
|
sb_has_quota_usage_enabled(sb, type)) {
|
|
ret = -EBUSY;
|
|
goto out_lock;
|
|
}
|
|
if (flags & DQUOT_LIMITS_ENABLED &&
|
|
sb_has_quota_limits_enabled(sb, type)) {
|
|
ret = -EBUSY;
|
|
goto out_lock;
|
|
}
|
|
spin_lock(&dq_state_lock);
|
|
sb_dqopt(sb)->flags |= dquot_state_flag(flags, type);
|
|
spin_unlock(&dq_state_lock);
|
|
out_lock:
|
|
mutex_unlock(&dqopt->dqonoff_mutex);
|
|
return ret;
|
|
}
|
|
|
|
load_quota:
|
|
return vfs_load_quota_inode(inode, type, format_id, flags);
|
|
}
|
|
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;
|
|
|
|
mutex_lock(&sb->s_root->d_inode->i_mutex);
|
|
dentry = lookup_one_len(qf_name, sb->s_root, strlen(qf_name));
|
|
mutex_unlock(&sb->s_root->d_inode->i_mutex);
|
|
if (IS_ERR(dentry))
|
|
return PTR_ERR(dentry);
|
|
|
|
if (!dentry->d_inode) {
|
|
error = -ENOENT;
|
|
goto out;
|
|
}
|
|
|
|
error = security_quota_on(dentry);
|
|
if (!error)
|
|
error = vfs_load_quota_inode(dentry->d_inode, type, format_id,
|
|
DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
|
|
|
|
out:
|
|
dput(dentry);
|
|
return error;
|
|
}
|
|
EXPORT_SYMBOL(dquot_quota_on_mount);
|
|
|
|
/* 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(&dq_data_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(&dq_data_lock);
|
|
}
|
|
|
|
int dquot_get_dqblk(struct super_block *sb, struct kqid qid,
|
|
struct qc_dqblk *di)
|
|
{
|
|
struct dquot *dquot;
|
|
|
|
dquot = dqget(sb, qid);
|
|
if (!dquot)
|
|
return -ESRCH;
|
|
do_get_dqblk(dquot, di);
|
|
dqput(dquot);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(dquot_get_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(&dq_data_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_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 = get_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 = get_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(&dq_data_lock);
|
|
mark_dquot_dirty(dquot);
|
|
|
|
return 0;
|
|
}
|
|
|
|
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 (!dquot) {
|
|
rc = -ESRCH;
|
|
goto out;
|
|
}
|
|
rc = do_set_dqblk(dquot, di);
|
|
dqput(dquot);
|
|
out:
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL(dquot_set_dqblk);
|
|
|
|
/* Generic routine for getting common part of quota file information */
|
|
int dquot_get_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii)
|
|
{
|
|
struct mem_dqinfo *mi;
|
|
|
|
mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
|
|
if (!sb_has_quota_active(sb, type)) {
|
|
mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
|
|
return -ESRCH;
|
|
}
|
|
mi = sb_dqopt(sb)->info + type;
|
|
spin_lock(&dq_data_lock);
|
|
ii->dqi_bgrace = mi->dqi_bgrace;
|
|
ii->dqi_igrace = mi->dqi_igrace;
|
|
ii->dqi_flags = mi->dqi_flags & DQF_GETINFO_MASK;
|
|
ii->dqi_valid = IIF_ALL;
|
|
spin_unlock(&dq_data_lock);
|
|
mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(dquot_get_dqinfo);
|
|
|
|
/* Generic routine for setting common part of quota file information */
|
|
int dquot_set_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii)
|
|
{
|
|
struct mem_dqinfo *mi;
|
|
int err = 0;
|
|
|
|
mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
|
|
if (!sb_has_quota_active(sb, type)) {
|
|
err = -ESRCH;
|
|
goto out;
|
|
}
|
|
mi = sb_dqopt(sb)->info + type;
|
|
spin_lock(&dq_data_lock);
|
|
if (ii->dqi_valid & IIF_BGRACE)
|
|
mi->dqi_bgrace = ii->dqi_bgrace;
|
|
if (ii->dqi_valid & IIF_IGRACE)
|
|
mi->dqi_igrace = ii->dqi_igrace;
|
|
if (ii->dqi_valid & IIF_FLAGS)
|
|
mi->dqi_flags = (mi->dqi_flags & ~DQF_SETINFO_MASK) |
|
|
(ii->dqi_flags & DQF_SETINFO_MASK);
|
|
spin_unlock(&dq_data_lock);
|
|
mark_info_dirty(sb, type);
|
|
/* Force write to disk */
|
|
sb->dq_op->write_info(sb, type);
|
|
out:
|
|
mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(dquot_set_dqinfo);
|
|
|
|
const struct quotactl_ops dquot_quotactl_ops = {
|
|
.quota_on = dquot_quota_on,
|
|
.quota_off = dquot_quota_off,
|
|
.quota_sync = dquot_quota_sync,
|
|
.get_info = dquot_get_dqinfo,
|
|
.set_info = dquot_set_dqinfo,
|
|
.get_dqblk = dquot_get_dqblk,
|
|
.set_dqblk = dquot_set_dqblk
|
|
};
|
|
EXPORT_SYMBOL(dquot_quotactl_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);
|
|
}
|
|
|
|
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_ATOMIC, 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);
|
|
|
|
printk("Dquot-cache hash table entries: %ld (order %ld, %ld bytes)\n",
|
|
nr_hash, order, (PAGE_SIZE << order));
|
|
|
|
register_shrinker(&dqcache_shrinker);
|
|
|
|
return 0;
|
|
}
|
|
module_init(dquot_init);
|