![Linus Torvalds](/assets/img/avatar_default.png)
Pull userns vfs updates from Eric Biederman: "This tree contains some very long awaited work on generalizing the user namespace support for mounting filesystems to include filesystems with a backing store. The real world target is fuse but the goal is to update the vfs to allow any filesystem to be supported. This patchset is based on a lot of code review and testing to approach that goal. While looking at what is needed to support the fuse filesystem it became clear that there were things like xattrs for security modules that needed special treatment. That the resolution of those concerns would not be fuse specific. That sorting out these general issues made most sense at the generic level, where the right people could be drawn into the conversation, and the issues could be solved for everyone. At a high level what this patchset does a couple of simple things: - Add a user namespace owner (s_user_ns) to struct super_block. - Teach the vfs to handle filesystem uids and gids not mapping into to kuids and kgids and being reported as INVALID_UID and INVALID_GID in vfs data structures. By assigning a user namespace owner filesystems that are mounted with only user namespace privilege can be detected. This allows security modules and the like to know which mounts may not be trusted. This also allows the set of uids and gids that are communicated to the filesystem to be capped at the set of kuids and kgids that are in the owning user namespace of the filesystem. One of the crazier corner casees this handles is the case of inodes whose i_uid or i_gid are not mapped into the vfs. Most of the code simply doesn't care but it is easy to confuse the inode writeback path so no operation that could cause an inode write-back is permitted for such inodes (aka only reads are allowed). This set of changes starts out by cleaning up the code paths involved in user namespace permirted mounts. Then when things are clean enough adds code that cleanly sets s_user_ns. Then additional restrictions are added that are possible now that the filesystem superblock contains owner information. These changes should not affect anyone in practice, but there are some parts of these restrictions that are changes in behavior. - Andy's restriction on suid executables that does not honor the suid bit when the path is from another mount namespace (think /proc/[pid]/fd/) or when the filesystem was mounted by a less privileged user. - The replacement of the user namespace implicit setting of MNT_NODEV with implicitly setting SB_I_NODEV on the filesystem superblock instead. Using SB_I_NODEV is a stronger form that happens to make this state user invisible. The user visibility can be managed but it caused problems when it was introduced from applications reasonably expecting mount flags to be what they were set to. There is a little bit of work remaining before it is safe to support mounting filesystems with backing store in user namespaces, beyond what is in this set of changes. - Verifying the mounter has permission to read/write the block device during mount. - Teaching the integrity modules IMA and EVM to handle filesystems mounted with only user namespace root and to reduce trust in their security xattrs accordingly. - Capturing the mounters credentials and using that for permission checks in d_automount and the like. (Given that overlayfs already does this, and we need the work in d_automount it make sense to generalize this case). Furthermore there are a few changes that are on the wishlist: - Get all filesystems supporting posix acls using the generic posix acls so that posix_acl_fix_xattr_from_user and posix_acl_fix_xattr_to_user may be removed. [Maintainability] - Reducing the permission checks in places such as remount to allow the superblock owner to perform them. - Allowing the superblock owner to chown files with unmapped uids and gids to something that is mapped so the files may be treated normally. I am not considering even obvious relaxations of permission checks until it is clear there are no more corner cases that need to be locked down and handled generically. Many thanks to Seth Forshee who kept this code alive, and putting up with me rewriting substantial portions of what he did to handle more corner cases, and for his diligent testing and reviewing of my changes" * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace: (30 commits) fs: Call d_automount with the filesystems creds fs: Update i_[ug]id_(read|write) to translate relative to s_user_ns evm: Translate user/group ids relative to s_user_ns when computing HMAC dquot: For now explicitly don't support filesystems outside of init_user_ns quota: Handle quota data stored in s_user_ns in quota_setxquota quota: Ensure qids map to the filesystem vfs: Don't create inodes with a uid or gid unknown to the vfs vfs: Don't modify inodes with a uid or gid unknown to the vfs cred: Reject inodes with invalid ids in set_create_file_as() fs: Check for invalid i_uid in may_follow_link() vfs: Verify acls are valid within superblock's s_user_ns. userns: Handle -1 in k[ug]id_has_mapping when !CONFIG_USER_NS fs: Refuse uid/gid changes which don't map into s_user_ns selinux: Add support for unprivileged mounts from user namespaces Smack: Handle labels consistently in untrusted mounts Smack: Add support for unprivileged mounts from user namespaces fs: Treat foreign mounts as nosuid fs: Limit file caps to the user namespace of the super block userns: Remove the now unnecessary FS_USERNS_DEV_MOUNT flag userns: Remove implicit MNT_NODEV fragility. ...
2993 lines
79 KiB
C
2993 lines
79 KiB
C
/*
|
|
* Implementation of the diskquota system for the LINUX operating system. QUOTA
|
|
* is implemented using the BSD system call interface as the means of
|
|
* communication with the user level. This file contains the generic routines
|
|
* called by the different filesystems on allocation of an inode or block.
|
|
* These routines take care of the administration needed to have a consistent
|
|
* diskquota tracking system. The ideas of both user and group quotas are based
|
|
* on the Melbourne quota system as used on BSD derived systems. The internal
|
|
* implementation is based on one of the several variants of the LINUX
|
|
* inode-subsystem with added complexity of the diskquota system.
|
|
*
|
|
* Author: Marco van Wieringen <mvw@planets.elm.net>
|
|
*
|
|
* Fixes: Dmitry Gorodchanin <pgmdsg@ibi.com>, 11 Feb 96
|
|
*
|
|
* Revised list management to avoid races
|
|
* -- Bill Hawes, <whawes@star.net>, 9/98
|
|
*
|
|
* Fixed races in dquot_transfer(), dqget() and dquot_alloc_...().
|
|
* As the consequence the locking was moved from dquot_decr_...(),
|
|
* dquot_incr_...() to calling functions.
|
|
* invalidate_dquots() now writes modified dquots.
|
|
* Serialized quota_off() and quota_on() for mount point.
|
|
* Fixed a few bugs in grow_dquots().
|
|
* Fixed deadlock in write_dquot() - we no longer account quotas on
|
|
* quota files
|
|
* remove_dquot_ref() moved to inode.c - it now traverses through inodes
|
|
* add_dquot_ref() restarts after blocking
|
|
* Added check for bogus uid and fixed check for group in quotactl.
|
|
* Jan Kara, <jack@suse.cz>, sponsored by SuSE CR, 10-11/99
|
|
*
|
|
* Used struct list_head instead of own list struct
|
|
* Invalidation of referenced dquots is no longer possible
|
|
* Improved free_dquots list management
|
|
* Quota and i_blocks are now updated in one place to avoid races
|
|
* Warnings are now delayed so we won't block in critical section
|
|
* Write updated not to require dquot lock
|
|
* Jan Kara, <jack@suse.cz>, 9/2000
|
|
*
|
|
* Added dynamic quota structure allocation
|
|
* Jan Kara <jack@suse.cz> 12/2000
|
|
*
|
|
* Rewritten quota interface. Implemented new quota format and
|
|
* formats registering.
|
|
* Jan Kara, <jack@suse.cz>, 2001,2002
|
|
*
|
|
* New SMP locking.
|
|
* Jan Kara, <jack@suse.cz>, 10/2002
|
|
*
|
|
* Added journalled quota support, fix lock inversion problems
|
|
* Jan Kara, <jack@suse.cz>, 2003,2004
|
|
*
|
|
* (C) Copyright 1994 - 1997 Marco van Wieringen
|
|
*/
|
|
|
|
#include <linux/errno.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/mount.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/time.h>
|
|
#include <linux/types.h>
|
|
#include <linux/string.h>
|
|
#include <linux/fcntl.h>
|
|
#include <linux/stat.h>
|
|
#include <linux/tty.h>
|
|
#include <linux/file.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/sysctl.h>
|
|
#include <linux/init.h>
|
|
#include <linux/module.h>
|
|
#include <linux/proc_fs.h>
|
|
#include <linux/security.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/kmod.h>
|
|
#include <linux/namei.h>
|
|
#include <linux/capability.h>
|
|
#include <linux/quotaops.h>
|
|
#include "../internal.h" /* ugh */
|
|
|
|
#include <linux/uaccess.h>
|
|
|
|
/*
|
|
* There are three quota SMP locks. dq_list_lock protects all lists with quotas
|
|
* and quota formats.
|
|
* dq_data_lock protects data from dq_dqb and also mem_dqinfo structures and
|
|
* also guards consistency of dquot->dq_dqb with inode->i_blocks, i_bytes.
|
|
* i_blocks and i_bytes updates itself are guarded by i_lock acquired directly
|
|
* in inode_add_bytes() and inode_sub_bytes(). dq_state_lock protects
|
|
* modifications of quota state (on quotaon and quotaoff) and readers who care
|
|
* about latest values take it as well.
|
|
*
|
|
* The spinlock ordering is hence: dq_data_lock > dq_list_lock > i_lock,
|
|
* dq_list_lock > dq_state_lock
|
|
*
|
|
* Note that some things (eg. sb pointer, type, id) doesn't change during
|
|
* the life of the dquot structure and so needn't to be protected by a lock
|
|
*
|
|
* Operation accessing dquots via inode pointers are protected by dquot_srcu.
|
|
* Operation of reading pointer needs srcu_read_lock(&dquot_srcu), and
|
|
* synchronize_srcu(&dquot_srcu) is called after clearing pointers from
|
|
* inode and before dropping dquot references to avoid use of dquots after
|
|
* they are freed. dq_data_lock is used to serialize the pointer setting and
|
|
* clearing operations.
|
|
* Special care needs to be taken about S_NOQUOTA inode flag (marking that
|
|
* inode is a quota file). Functions adding pointers from inode to dquots have
|
|
* to check this flag under dq_data_lock and then (if S_NOQUOTA is not set) they
|
|
* have to do all pointer modifications before dropping dq_data_lock. This makes
|
|
* sure they cannot race with quotaon which first sets S_NOQUOTA flag and
|
|
* then drops all pointers to dquots from an inode.
|
|
*
|
|
* Each dquot has its dq_lock mutex. Locked dquots might not be referenced
|
|
* from inodes (dquot_alloc_space() and such don't check the dq_lock).
|
|
* Currently dquot is locked only when it is being read to memory (or space for
|
|
* it is being allocated) on the first dqget() and when it is being released on
|
|
* the last dqput(). The allocation and release oparations are serialized by
|
|
* the dq_lock and by checking the use count in dquot_release(). Write
|
|
* operations on dquots don't hold dq_lock as they copy data under dq_data_lock
|
|
* spinlock to internal buffers before writing.
|
|
*
|
|
* Lock ordering (including related VFS locks) is the following:
|
|
* dqonoff_mutex > i_mutex > journal_lock > dquot->dq_lock > dqio_mutex
|
|
* dqonoff_mutex > i_mutex comes from dquot_quota_sync, dquot_enable, etc.
|
|
*/
|
|
|
|
static __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_list_lock);
|
|
static __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_state_lock);
|
|
__cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_data_lock);
|
|
EXPORT_SYMBOL(dq_data_lock);
|
|
DEFINE_STATIC_SRCU(dquot_srcu);
|
|
|
|
void __quota_error(struct super_block *sb, const char *func,
|
|
const char *fmt, ...)
|
|
{
|
|
if (printk_ratelimit()) {
|
|
va_list args;
|
|
struct va_format vaf;
|
|
|
|
va_start(args, fmt);
|
|
|
|
vaf.fmt = fmt;
|
|
vaf.va = &args;
|
|
|
|
printk(KERN_ERR "Quota error (device %s): %s: %pV\n",
|
|
sb->s_id, func, &vaf);
|
|
|
|
va_end(args);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(__quota_error);
|
|
|
|
#if defined(CONFIG_QUOTA_DEBUG) || defined(CONFIG_PRINT_QUOTA_WARNING)
|
|
static char *quotatypes[] = INITQFNAMES;
|
|
#endif
|
|
static struct quota_format_type *quota_formats; /* List of registered formats */
|
|
static struct quota_module_name module_names[] = INIT_QUOTA_MODULE_NAMES;
|
|
|
|
/* SLAB cache for dquot structures */
|
|
static struct kmem_cache *dquot_cachep;
|
|
|
|
int register_quota_format(struct quota_format_type *fmt)
|
|
{
|
|
spin_lock(&dq_list_lock);
|
|
fmt->qf_next = quota_formats;
|
|
quota_formats = fmt;
|
|
spin_unlock(&dq_list_lock);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(register_quota_format);
|
|
|
|
void unregister_quota_format(struct quota_format_type *fmt)
|
|
{
|
|
struct quota_format_type **actqf;
|
|
|
|
spin_lock(&dq_list_lock);
|
|
for (actqf = "a_formats; *actqf && *actqf != fmt;
|
|
actqf = &(*actqf)->qf_next)
|
|
;
|
|
if (*actqf)
|
|
*actqf = (*actqf)->qf_next;
|
|
spin_unlock(&dq_list_lock);
|
|
}
|
|
EXPORT_SYMBOL(unregister_quota_format);
|
|
|
|
static struct quota_format_type *find_quota_format(int id)
|
|
{
|
|
struct quota_format_type *actqf;
|
|
|
|
spin_lock(&dq_list_lock);
|
|
for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id;
|
|
actqf = actqf->qf_next)
|
|
;
|
|
if (!actqf || !try_module_get(actqf->qf_owner)) {
|
|
int qm;
|
|
|
|
spin_unlock(&dq_list_lock);
|
|
|
|
for (qm = 0; module_names[qm].qm_fmt_id &&
|
|
module_names[qm].qm_fmt_id != id; qm++)
|
|
;
|
|
if (!module_names[qm].qm_fmt_id ||
|
|
request_module(module_names[qm].qm_mod_name))
|
|
return NULL;
|
|
|
|
spin_lock(&dq_list_lock);
|
|
for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id;
|
|
actqf = actqf->qf_next)
|
|
;
|
|
if (actqf && !try_module_get(actqf->qf_owner))
|
|
actqf = NULL;
|
|
}
|
|
spin_unlock(&dq_list_lock);
|
|
return actqf;
|
|
}
|
|
|
|
static void put_quota_format(struct quota_format_type *fmt)
|
|
{
|
|
module_put(fmt->qf_owner);
|
|
}
|
|
|
|
/*
|
|
* Dquot List Management:
|
|
* The quota code uses three lists for dquot management: the inuse_list,
|
|
* free_dquots, and dquot_hash[] array. A single dquot structure may be
|
|
* on all three lists, depending on its current state.
|
|
*
|
|
* All dquots are placed to the end of inuse_list when first created, and this
|
|
* list is used for invalidate operation, which must look at every dquot.
|
|
*
|
|
* Unused dquots (dq_count == 0) are added to the free_dquots list when freed,
|
|
* and this list is searched whenever we need an available dquot. Dquots are
|
|
* removed from the list as soon as they are used again, and
|
|
* dqstats.free_dquots gives the number of dquots on the list. When
|
|
* dquot is invalidated it's completely released from memory.
|
|
*
|
|
* Dquots with a specific identity (device, type and id) are placed on
|
|
* one of the dquot_hash[] hash chains. The provides an efficient search
|
|
* mechanism to locate a specific dquot.
|
|
*/
|
|
|
|
static LIST_HEAD(inuse_list);
|
|
static LIST_HEAD(free_dquots);
|
|
static unsigned int dq_hash_bits, dq_hash_mask;
|
|
static struct hlist_head *dquot_hash;
|
|
|
|
struct dqstats dqstats;
|
|
EXPORT_SYMBOL(dqstats);
|
|
|
|
static qsize_t inode_get_rsv_space(struct inode *inode);
|
|
static int __dquot_initialize(struct inode *inode, int type);
|
|
|
|
static inline unsigned int
|
|
hashfn(const struct super_block *sb, struct kqid qid)
|
|
{
|
|
unsigned int id = from_kqid(&init_user_ns, qid);
|
|
int type = qid.type;
|
|
unsigned long tmp;
|
|
|
|
tmp = (((unsigned long)sb>>L1_CACHE_SHIFT) ^ id) * (MAXQUOTAS - type);
|
|
return (tmp + (tmp >> dq_hash_bits)) & dq_hash_mask;
|
|
}
|
|
|
|
/*
|
|
* Following list functions expect dq_list_lock to be held
|
|
*/
|
|
static inline void insert_dquot_hash(struct dquot *dquot)
|
|
{
|
|
struct hlist_head *head;
|
|
head = dquot_hash + hashfn(dquot->dq_sb, dquot->dq_id);
|
|
hlist_add_head(&dquot->dq_hash, head);
|
|
}
|
|
|
|
static inline void remove_dquot_hash(struct dquot *dquot)
|
|
{
|
|
hlist_del_init(&dquot->dq_hash);
|
|
}
|
|
|
|
static struct dquot *find_dquot(unsigned int hashent, struct super_block *sb,
|
|
struct kqid qid)
|
|
{
|
|
struct hlist_node *node;
|
|
struct dquot *dquot;
|
|
|
|
hlist_for_each (node, dquot_hash+hashent) {
|
|
dquot = hlist_entry(node, struct dquot, dq_hash);
|
|
if (dquot->dq_sb == sb && qid_eq(dquot->dq_id, qid))
|
|
return dquot;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/* Add a dquot to the tail of the free list */
|
|
static inline void put_dquot_last(struct dquot *dquot)
|
|
{
|
|
list_add_tail(&dquot->dq_free, &free_dquots);
|
|
dqstats_inc(DQST_FREE_DQUOTS);
|
|
}
|
|
|
|
static inline void remove_free_dquot(struct dquot *dquot)
|
|
{
|
|
if (list_empty(&dquot->dq_free))
|
|
return;
|
|
list_del_init(&dquot->dq_free);
|
|
dqstats_dec(DQST_FREE_DQUOTS);
|
|
}
|
|
|
|
static inline void put_inuse(struct dquot *dquot)
|
|
{
|
|
/* We add to the back of inuse list so we don't have to restart
|
|
* when traversing this list and we block */
|
|
list_add_tail(&dquot->dq_inuse, &inuse_list);
|
|
dqstats_inc(DQST_ALLOC_DQUOTS);
|
|
}
|
|
|
|
static inline void remove_inuse(struct dquot *dquot)
|
|
{
|
|
dqstats_dec(DQST_ALLOC_DQUOTS);
|
|
list_del(&dquot->dq_inuse);
|
|
}
|
|
/*
|
|
* End of list functions needing dq_list_lock
|
|
*/
|
|
|
|
static void wait_on_dquot(struct dquot *dquot)
|
|
{
|
|
mutex_lock(&dquot->dq_lock);
|
|
mutex_unlock(&dquot->dq_lock);
|
|
}
|
|
|
|
static inline int dquot_dirty(struct dquot *dquot)
|
|
{
|
|
return test_bit(DQ_MOD_B, &dquot->dq_flags);
|
|
}
|
|
|
|
static inline int mark_dquot_dirty(struct dquot *dquot)
|
|
{
|
|
return dquot->dq_sb->dq_op->mark_dirty(dquot);
|
|
}
|
|
|
|
/* Mark dquot dirty in atomic manner, and return it's old dirty flag state */
|
|
int dquot_mark_dquot_dirty(struct dquot *dquot)
|
|
{
|
|
int ret = 1;
|
|
|
|
/* If quota is dirty already, we don't have to acquire dq_list_lock */
|
|
if (test_bit(DQ_MOD_B, &dquot->dq_flags))
|
|
return 1;
|
|
|
|
spin_lock(&dq_list_lock);
|
|
if (!test_and_set_bit(DQ_MOD_B, &dquot->dq_flags)) {
|
|
list_add(&dquot->dq_dirty, &sb_dqopt(dquot->dq_sb)->
|
|
info[dquot->dq_id.type].dqi_dirty_list);
|
|
ret = 0;
|
|
}
|
|
spin_unlock(&dq_list_lock);
|
|
return ret;
|
|
}
|
|
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;
|
|
/* Make sure flags update is visible after dquot has been filled */
|
|
smp_mb__before_atomic();
|
|
set_bit(DQ_READ_B, &dquot->dq_flags);
|
|
/* Instantiate dquot if needed */
|
|
if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && !dquot->dq_off) {
|
|
ret = dqopt->ops[dquot->dq_id.type]->commit_dqblk(dquot);
|
|
/* Write the info if needed */
|
|
if (info_dirty(&dqopt->info[dquot->dq_id.type])) {
|
|
ret2 = dqopt->ops[dquot->dq_id.type]->write_file_info(
|
|
dquot->dq_sb, dquot->dq_id.type);
|
|
}
|
|
if (ret < 0)
|
|
goto out_iolock;
|
|
if (ret2 < 0) {
|
|
ret = ret2;
|
|
goto out_iolock;
|
|
}
|
|
}
|
|
/*
|
|
* Make sure flags update is visible after on-disk struct has been
|
|
* allocated. Paired with smp_rmb() in dqget().
|
|
*/
|
|
smp_mb__before_atomic();
|
|
set_bit(DQ_ACTIVE_B, &dquot->dq_flags);
|
|
out_iolock:
|
|
mutex_unlock(&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;
|
|
inode_lock(dqopt->files[cnt]);
|
|
truncate_inode_pages(&dqopt->files[cnt]->i_data, 0);
|
|
inode_unlock(dqopt->files[cnt]);
|
|
}
|
|
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, *empty = NULL;
|
|
|
|
if (!qid_has_mapping(sb->s_user_ns, qid))
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
if (!sb_has_quota_active(sb, qid.type))
|
|
return ERR_PTR(-ESRCH);
|
|
we_slept:
|
|
spin_lock(&dq_list_lock);
|
|
spin_lock(&dq_state_lock);
|
|
if (!sb_has_quota_active(sb, qid.type)) {
|
|
spin_unlock(&dq_state_lock);
|
|
spin_unlock(&dq_list_lock);
|
|
dquot = ERR_PTR(-ESRCH);
|
|
goto out;
|
|
}
|
|
spin_unlock(&dq_state_lock);
|
|
|
|
dquot = find_dquot(hashent, sb, qid);
|
|
if (!dquot) {
|
|
if (!empty) {
|
|
spin_unlock(&dq_list_lock);
|
|
empty = get_empty_dquot(sb, qid.type);
|
|
if (!empty)
|
|
schedule(); /* Try to wait for a moment... */
|
|
goto we_slept;
|
|
}
|
|
dquot = empty;
|
|
empty = NULL;
|
|
dquot->dq_id = qid;
|
|
/* all dquots go on the inuse_list */
|
|
put_inuse(dquot);
|
|
/* hash it first so it can be found */
|
|
insert_dquot_hash(dquot);
|
|
spin_unlock(&dq_list_lock);
|
|
dqstats_inc(DQST_LOOKUPS);
|
|
} else {
|
|
if (!atomic_read(&dquot->dq_count))
|
|
remove_free_dquot(dquot);
|
|
atomic_inc(&dquot->dq_count);
|
|
spin_unlock(&dq_list_lock);
|
|
dqstats_inc(DQST_CACHE_HITS);
|
|
dqstats_inc(DQST_LOOKUPS);
|
|
}
|
|
/* Wait for dq_lock - after this we know that either dquot_release() is
|
|
* already finished or it will be canceled due to dq_count > 1 test */
|
|
wait_on_dquot(dquot);
|
|
/* Read the dquot / allocate space in quota file */
|
|
if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) {
|
|
int err;
|
|
|
|
err = sb->dq_op->acquire_dquot(dquot);
|
|
if (err < 0) {
|
|
dqput(dquot);
|
|
dquot = ERR_PTR(err);
|
|
goto out;
|
|
}
|
|
}
|
|
/*
|
|
* Make sure following reads see filled structure - paired with
|
|
* smp_mb__before_atomic() in dquot_acquire().
|
|
*/
|
|
smp_rmb();
|
|
#ifdef CONFIG_QUOTA_DEBUG
|
|
BUG_ON(!dquot->dq_sb); /* Has somebody invalidated entry under us? */
|
|
#endif
|
|
out:
|
|
if (empty)
|
|
do_destroy_dquot(empty);
|
|
|
|
return dquot;
|
|
}
|
|
EXPORT_SYMBOL(dqget);
|
|
|
|
static inline struct dquot **i_dquot(struct inode *inode)
|
|
{
|
|
return inode->i_sb->s_op->get_dquots(inode);
|
|
}
|
|
|
|
static int dqinit_needed(struct inode *inode, int type)
|
|
{
|
|
struct dquot * const *dquots;
|
|
int cnt;
|
|
|
|
if (IS_NOQUOTA(inode))
|
|
return 0;
|
|
|
|
dquots = i_dquot(inode);
|
|
if (type != -1)
|
|
return !dquots[type];
|
|
for (cnt = 0; cnt < MAXQUOTAS; cnt++)
|
|
if (!dquots[cnt])
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
/* 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(&sb->s_inode_list_lock);
|
|
list_for_each_entry(inode, &sb->s_inodes, i_sb_list) {
|
|
spin_lock(&inode->i_lock);
|
|
if ((inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW)) ||
|
|
!atomic_read(&inode->i_writecount) ||
|
|
!dqinit_needed(inode, type)) {
|
|
spin_unlock(&inode->i_lock);
|
|
continue;
|
|
}
|
|
__iget(inode);
|
|
spin_unlock(&inode->i_lock);
|
|
spin_unlock(&sb->s_inode_list_lock);
|
|
|
|
#ifdef CONFIG_QUOTA_DEBUG
|
|
if (unlikely(inode_get_rsv_space(inode) > 0))
|
|
reserved = 1;
|
|
#endif
|
|
iput(old_inode);
|
|
__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
|
|
* s_inode_list_lock. We cannot iput the inode now as we can be
|
|
* holding the last reference and we cannot iput it under
|
|
* s_inode_list_lock. So we keep the reference and iput it
|
|
* later.
|
|
*/
|
|
old_inode = inode;
|
|
spin_lock(&sb->s_inode_list_lock);
|
|
}
|
|
spin_unlock(&sb->s_inode_list_lock);
|
|
iput(old_inode);
|
|
|
|
#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 **dquots = i_dquot(inode);
|
|
struct dquot *dquot = dquots[type];
|
|
|
|
if (!dquot)
|
|
return;
|
|
|
|
dquots[type] = NULL;
|
|
if (list_empty(&dquot->dq_free)) {
|
|
/*
|
|
* The inode still has reference to dquot so it can't be in the
|
|
* free list
|
|
*/
|
|
spin_lock(&dq_list_lock);
|
|
list_add(&dquot->dq_free, tofree_head);
|
|
spin_unlock(&dq_list_lock);
|
|
} else {
|
|
/*
|
|
* Dquot is already in a list to put so we won't drop the last
|
|
* reference here.
|
|
*/
|
|
dqput(dquot);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* 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(&sb->s_inode_list_lock);
|
|
list_for_each_entry(inode, &sb->s_inodes, i_sb_list) {
|
|
/*
|
|
* We have to scan also I_NEW inodes because they can already
|
|
* have quota pointer initialized. Luckily, we need to touch
|
|
* only quota pointers and these have separate locking
|
|
* (dq_data_lock).
|
|
*/
|
|
spin_lock(&dq_data_lock);
|
|
if (!IS_NOQUOTA(inode)) {
|
|
if (unlikely(inode_get_rsv_space(inode) > 0))
|
|
reserved = 1;
|
|
remove_inode_dquot_ref(inode, type, tofree_head);
|
|
}
|
|
spin_unlock(&dq_data_lock);
|
|
}
|
|
spin_unlock(&sb->s_inode_list_lock);
|
|
#ifdef CONFIG_QUOTA_DEBUG
|
|
if (reserved) {
|
|
printk(KERN_WARNING "VFS (%s): Writes happened after quota"
|
|
" was disabled thus quota information is probably "
|
|
"inconsistent. Please run quotacheck(8).\n", sb->s_id);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
/* 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 = (time64_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 = (time64_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:
|
|
return 1;
|
|
}
|
|
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 & DQF_ROOT_SQUASH));
|
|
}
|
|
|
|
/* 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 &&
|
|
ktime_get_real_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 = ktime_get_real_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 &&
|
|
ktime_get_real_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 = ktime_get_real_seconds() +
|
|
sb_dqopt(sb)->info[dquot->dq_id.type].dqi_bgrace;
|
|
}
|
|
else
|
|
/*
|
|
* We don't allow preallocation to exceed softlimit so exceeding will
|
|
* be always printed
|
|
*/
|
|
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 int __dquot_initialize(struct inode *inode, int type)
|
|
{
|
|
int cnt, init_needed = 0;
|
|
struct dquot **dquots, *got[MAXQUOTAS] = {};
|
|
struct super_block *sb = inode->i_sb;
|
|
qsize_t rsv;
|
|
int ret = 0;
|
|
|
|
if (!dquot_active(inode))
|
|
return 0;
|
|
|
|
dquots = i_dquot(inode);
|
|
|
|
/* First get references to structures we might need. */
|
|
for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
|
|
struct kqid qid;
|
|
kprojid_t projid;
|
|
int rc;
|
|
struct dquot *dquot;
|
|
|
|
if (type != -1 && cnt != type)
|
|
continue;
|
|
/*
|
|
* The i_dquot should have been initialized in most cases,
|
|
* we check it without locking here to avoid unnecessary
|
|
* dqget()/dqput() calls.
|
|
*/
|
|
if (dquots[cnt])
|
|
continue;
|
|
|
|
if (!sb_has_quota_active(sb, cnt))
|
|
continue;
|
|
|
|
init_needed = 1;
|
|
|
|
switch (cnt) {
|
|
case USRQUOTA:
|
|
qid = make_kqid_uid(inode->i_uid);
|
|
break;
|
|
case GRPQUOTA:
|
|
qid = make_kqid_gid(inode->i_gid);
|
|
break;
|
|
case PRJQUOTA:
|
|
rc = inode->i_sb->dq_op->get_projid(inode, &projid);
|
|
if (rc)
|
|
continue;
|
|
qid = make_kqid_projid(projid);
|
|
break;
|
|
}
|
|
dquot = dqget(sb, qid);
|
|
if (IS_ERR(dquot)) {
|
|
/* We raced with somebody turning quotas off... */
|
|
if (PTR_ERR(dquot) != -ESRCH) {
|
|
ret = PTR_ERR(dquot);
|
|
goto out_put;
|
|
}
|
|
dquot = NULL;
|
|
}
|
|
got[cnt] = dquot;
|
|
}
|
|
|
|
/* All required i_dquot has been initialized */
|
|
if (!init_needed)
|
|
return 0;
|
|
|
|
spin_lock(&dq_data_lock);
|
|
if (IS_NOQUOTA(inode))
|
|
goto out_lock;
|
|
for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
|
|
if (type != -1 && cnt != type)
|
|
continue;
|
|
/* Avoid races with quotaoff() */
|
|
if (!sb_has_quota_active(sb, cnt))
|
|
continue;
|
|
/* We could race with quotaon or dqget() could have failed */
|
|
if (!got[cnt])
|
|
continue;
|
|
if (!dquots[cnt]) {
|
|
dquots[cnt] = got[cnt];
|
|
got[cnt] = NULL;
|
|
/*
|
|
* Make quota reservation system happy if someone
|
|
* did a write before quota was turned on
|
|
*/
|
|
rsv = inode_get_rsv_space(inode);
|
|
if (unlikely(rsv))
|
|
dquot_resv_space(dquots[cnt], rsv);
|
|
}
|
|
}
|
|
out_lock:
|
|
spin_unlock(&dq_data_lock);
|
|
out_put:
|
|
/* Drop unused references */
|
|
dqput_all(got);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int dquot_initialize(struct inode *inode)
|
|
{
|
|
return __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 **dquots = i_dquot(inode);
|
|
struct dquot *put[MAXQUOTAS];
|
|
|
|
spin_lock(&dq_data_lock);
|
|
for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
|
|
put[cnt] = dquots[cnt];
|
|
dquots[cnt] = NULL;
|
|
}
|
|
spin_unlock(&dq_data_lock);
|
|
dqput_all(put);
|
|
}
|
|
|
|
void dquot_drop(struct inode *inode)
|
|
{
|
|
struct dquot * const *dquots;
|
|
int cnt;
|
|
|
|
if (IS_NOQUOTA(inode))
|
|
return;
|
|
|
|
/*
|
|
* Test before calling to rule out calls from proc and such
|
|
* where we are not allowed to block. Note that this is
|
|
* actually reliable test even without the lock - the caller
|
|
* must assure that nobody can come after the DQUOT_DROP and
|
|
* add quota pointers back anyway.
|
|
*/
|
|
dquots = i_dquot(inode);
|
|
for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
|
|
if (dquots[cnt])
|
|
break;
|
|
}
|
|
|
|
if (cnt < MAXQUOTAS)
|
|
__dquot_drop(inode);
|
|
}
|
|
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];
|
|
int reserve = flags & DQUOT_SPACE_RESERVE;
|
|
struct dquot **dquots;
|
|
|
|
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;
|
|
|
|
dquots = i_dquot(inode);
|
|
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(struct inode *inode)
|
|
{
|
|
int cnt, ret = 0, index;
|
|
struct dquot_warn warn[MAXQUOTAS];
|
|
struct dquot * const *dquots;
|
|
|
|
if (!dquot_active(inode))
|
|
return 0;
|
|
for (cnt = 0; cnt < MAXQUOTAS; cnt++)
|
|
warn[cnt].w_type = QUOTA_NL_NOWARN;
|
|
|
|
dquots = i_dquot(inode);
|
|
index = srcu_read_lock(&dquot_srcu);
|
|
spin_lock(&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)
|
|
{
|
|
struct dquot **dquots;
|
|
int cnt, index;
|
|
|
|
if (!dquot_active(inode)) {
|
|
inode_claim_rsv_space(inode, number);
|
|
return 0;
|
|
}
|
|
|
|
dquots = i_dquot(inode);
|
|
index = srcu_read_lock(&dquot_srcu);
|
|
spin_lock(&dq_data_lock);
|
|
/* Claim reserved quotas to allocated quotas */
|
|
for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
|
|
if (dquots[cnt])
|
|
dquot_claim_reserved_space(dquots[cnt], number);
|
|
}
|
|
/* Update inode bytes */
|
|
inode_claim_rsv_space(inode, number);
|
|
spin_unlock(&dq_data_lock);
|
|
mark_all_dquot_dirty(dquots);
|
|
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)
|
|
{
|
|
struct dquot **dquots;
|
|
int cnt, index;
|
|
|
|
if (!dquot_active(inode)) {
|
|
inode_reclaim_rsv_space(inode, number);
|
|
return;
|
|
}
|
|
|
|
dquots = i_dquot(inode);
|
|
index = srcu_read_lock(&dquot_srcu);
|
|
spin_lock(&dq_data_lock);
|
|
/* Claim reserved quotas to allocated quotas */
|
|
for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
|
|
if (dquots[cnt])
|
|
dquot_reclaim_reserved_space(dquots[cnt], number);
|
|
}
|
|
/* Update inode bytes */
|
|
inode_reclaim_rsv_space(inode, number);
|
|
spin_unlock(&dq_data_lock);
|
|
mark_all_dquot_dirty(dquots);
|
|
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;
|
|
int reserve = flags & DQUOT_SPACE_RESERVE, index;
|
|
|
|
if (!dquot_active(inode)) {
|
|
inode_decr_space(inode, number, reserve);
|
|
return;
|
|
}
|
|
|
|
dquots = i_dquot(inode);
|
|
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(struct inode *inode)
|
|
{
|
|
unsigned int cnt;
|
|
struct dquot_warn warn[MAXQUOTAS];
|
|
struct dquot * const *dquots;
|
|
int index;
|
|
|
|
if (!dquot_active(inode))
|
|
return;
|
|
|
|
dquots = i_dquot(inode);
|
|
index = srcu_read_lock(&dquot_srcu);
|
|
spin_lock(&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] = i_dquot(inode)[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);
|
|
|
|
i_dquot(inode)[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 dquot *dquot;
|
|
struct super_block *sb = inode->i_sb;
|
|
int ret;
|
|
|
|
if (!dquot_active(inode))
|
|
return 0;
|
|
|
|
if (iattr->ia_valid & ATTR_UID && !uid_eq(iattr->ia_uid, inode->i_uid)){
|
|
dquot = dqget(sb, make_kqid_uid(iattr->ia_uid));
|
|
if (IS_ERR(dquot)) {
|
|
if (PTR_ERR(dquot) != -ESRCH) {
|
|
ret = PTR_ERR(dquot);
|
|
goto out_put;
|
|
}
|
|
dquot = NULL;
|
|
}
|
|
transfer_to[USRQUOTA] = dquot;
|
|
}
|
|
if (iattr->ia_valid & ATTR_GID && !gid_eq(iattr->ia_gid, inode->i_gid)){
|
|
dquot = dqget(sb, make_kqid_gid(iattr->ia_gid));
|
|
if (IS_ERR(dquot)) {
|
|
if (PTR_ERR(dquot) != -ESRCH) {
|
|
ret = PTR_ERR(dquot);
|
|
goto out_put;
|
|
}
|
|
dquot = NULL;
|
|
}
|
|
transfer_to[GRPQUOTA] = dquot;
|
|
}
|
|
ret = __dquot_transfer(inode, transfer_to);
|
|
out_put:
|
|
dqput_all(transfer_to);
|
|
return ret;
|
|
}
|
|
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);
|
|
|
|
int dquot_get_next_id(struct super_block *sb, struct kqid *qid)
|
|
{
|
|
struct quota_info *dqopt = sb_dqopt(sb);
|
|
int err;
|
|
|
|
mutex_lock(&dqopt->dqonoff_mutex);
|
|
if (!sb_has_quota_active(sb, qid->type)) {
|
|
err = -ESRCH;
|
|
goto out;
|
|
}
|
|
if (!dqopt->ops[qid->type]->get_next_id) {
|
|
err = -ENOSYS;
|
|
goto out;
|
|
}
|
|
mutex_lock(&dqopt->dqio_mutex);
|
|
err = dqopt->ops[qid->type]->get_next_id(sb, qid);
|
|
mutex_unlock(&dqopt->dqio_mutex);
|
|
out:
|
|
mutex_unlock(&dqopt->dqonoff_mutex);
|
|
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(dquot_get_next_id);
|
|
|
|
/*
|
|
* Definitions of diskquota operations.
|
|
*/
|
|
const struct dquot_operations dquot_operations = {
|
|
.write_dquot = dquot_commit,
|
|
.acquire_dquot = dquot_acquire,
|
|
.release_dquot = dquot_release,
|
|
.mark_dirty = dquot_mark_dquot_dirty,
|
|
.write_info = dquot_commit_info,
|
|
.alloc_dquot = dquot_alloc,
|
|
.destroy_dquot = dquot_destroy,
|
|
.get_next_id = dquot_get_next_id,
|
|
};
|
|
EXPORT_SYMBOL(dquot_operations);
|
|
|
|
/*
|
|
* Generic helper for ->open on filesystems supporting disk quotas.
|
|
*/
|
|
int dquot_file_open(struct inode *inode, struct file *file)
|
|
{
|
|
int error;
|
|
|
|
error = generic_file_open(inode, file);
|
|
if (!error && (file->f_mode & FMODE_WRITE))
|
|
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)) {
|
|
inode_lock(toputinode[cnt]);
|
|
toputinode[cnt]->i_flags &= ~(S_IMMUTABLE |
|
|
S_NOATIME | S_NOQUOTA);
|
|
truncate_inode_pages(&toputinode[cnt]->i_data,
|
|
0);
|
|
inode_unlock(toputinode[cnt]);
|
|
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 ||
|
|
(type == PRJQUOTA && sb->dq_op->get_projid == NULL)) {
|
|
error = -EINVAL;
|
|
goto out_fmt;
|
|
}
|
|
/* Filesystems outside of init_user_ns not yet supported */
|
|
if (sb->s_user_ns != &init_user_ns) {
|
|
error = -EINVAL;
|
|
goto out_fmt;
|
|
}
|
|
/* Usage always has to be set... */
|
|
if (!(flags & DQUOT_USAGE_ENABLED)) {
|
|
error = -EINVAL;
|
|
goto out_fmt;
|
|
}
|
|
|
|
if (!(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. */
|
|
inode_lock(inode);
|
|
oldflags = inode->i_flags & (S_NOATIME | S_IMMUTABLE |
|
|
S_NOQUOTA);
|
|
inode->i_flags |= S_NOQUOTA | S_NOATIME | S_IMMUTABLE;
|
|
inode_unlock(inode);
|
|
/*
|
|
* When S_NOQUOTA is set, remove dquot references as no more
|
|
* references can be added
|
|
*/
|
|
__dquot_drop(inode);
|
|
}
|
|
|
|
error = -EIO;
|
|
dqopt->files[type] = igrab(inode);
|
|
if (!dqopt->files[type])
|
|
goto out_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) {
|
|
inode_lock(inode);
|
|
/* 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;
|
|
inode_unlock(inode);
|
|
}
|
|
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(d_inode(path->dentry), 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;
|
|
|
|
dentry = lookup_one_len_unlocked(qf_name, sb->s_root, strlen(qf_name));
|
|
if (IS_ERR(dentry))
|
|
return PTR_ERR(dentry);
|
|
|
|
if (d_really_is_negative(dentry)) {
|
|
error = -ENOENT;
|
|
goto out;
|
|
}
|
|
|
|
error = security_quota_on(dentry);
|
|
if (!error)
|
|
error = vfs_load_quota_inode(d_inode(dentry), type, format_id,
|
|
DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
|
|
|
|
out:
|
|
dput(dentry);
|
|
return error;
|
|
}
|
|
EXPORT_SYMBOL(dquot_quota_on_mount);
|
|
|
|
static int dquot_quota_enable(struct super_block *sb, unsigned int flags)
|
|
{
|
|
int ret;
|
|
int type;
|
|
struct quota_info *dqopt = sb_dqopt(sb);
|
|
|
|
if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE))
|
|
return -ENOSYS;
|
|
/* Accounting cannot be turned on while fs is mounted */
|
|
flags &= ~(FS_QUOTA_UDQ_ACCT | FS_QUOTA_GDQ_ACCT | FS_QUOTA_PDQ_ACCT);
|
|
if (!flags)
|
|
return -EINVAL;
|
|
for (type = 0; type < MAXQUOTAS; type++) {
|
|
if (!(flags & qtype_enforce_flag(type)))
|
|
continue;
|
|
/* Can't enforce without accounting */
|
|
if (!sb_has_quota_usage_enabled(sb, type))
|
|
return -EINVAL;
|
|
ret = dquot_enable(dqopt->files[type], type,
|
|
dqopt->info[type].dqi_fmt_id,
|
|
DQUOT_LIMITS_ENABLED);
|
|
if (ret < 0)
|
|
goto out_err;
|
|
}
|
|
return 0;
|
|
out_err:
|
|
/* Backout enforcement enablement we already did */
|
|
for (type--; type >= 0; type--) {
|
|
if (flags & qtype_enforce_flag(type))
|
|
dquot_disable(sb, type, DQUOT_LIMITS_ENABLED);
|
|
}
|
|
/* Error code translation for better compatibility with XFS */
|
|
if (ret == -EBUSY)
|
|
ret = -EEXIST;
|
|
return ret;
|
|
}
|
|
|
|
static int dquot_quota_disable(struct super_block *sb, unsigned int flags)
|
|
{
|
|
int ret;
|
|
int type;
|
|
struct quota_info *dqopt = sb_dqopt(sb);
|
|
|
|
if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE))
|
|
return -ENOSYS;
|
|
/*
|
|
* We don't support turning off accounting via quotactl. In principle
|
|
* quota infrastructure can do this but filesystems don't expect
|
|
* userspace to be able to do it.
|
|
*/
|
|
if (flags &
|
|
(FS_QUOTA_UDQ_ACCT | FS_QUOTA_GDQ_ACCT | FS_QUOTA_PDQ_ACCT))
|
|
return -EOPNOTSUPP;
|
|
|
|
/* Filter out limits not enabled */
|
|
for (type = 0; type < MAXQUOTAS; type++)
|
|
if (!sb_has_quota_limits_enabled(sb, type))
|
|
flags &= ~qtype_enforce_flag(type);
|
|
/* Nothing left? */
|
|
if (!flags)
|
|
return -EEXIST;
|
|
for (type = 0; type < MAXQUOTAS; type++) {
|
|
if (flags & qtype_enforce_flag(type)) {
|
|
ret = dquot_disable(sb, type, DQUOT_LIMITS_ENABLED);
|
|
if (ret < 0)
|
|
goto out_err;
|
|
}
|
|
}
|
|
return 0;
|
|
out_err:
|
|
/* Backout enforcement disabling we already did */
|
|
for (type--; type >= 0; type--) {
|
|
if (flags & qtype_enforce_flag(type))
|
|
dquot_enable(dqopt->files[type], type,
|
|
dqopt->info[type].dqi_fmt_id,
|
|
DQUOT_LIMITS_ENABLED);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/* 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 (IS_ERR(dquot))
|
|
return PTR_ERR(dquot);
|
|
do_get_dqblk(dquot, di);
|
|
dqput(dquot);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(dquot_get_dqblk);
|
|
|
|
int dquot_get_next_dqblk(struct super_block *sb, struct kqid *qid,
|
|
struct qc_dqblk *di)
|
|
{
|
|
struct dquot *dquot;
|
|
int err;
|
|
|
|
if (!sb->dq_op->get_next_id)
|
|
return -ENOSYS;
|
|
err = sb->dq_op->get_next_id(sb, qid);
|
|
if (err < 0)
|
|
return err;
|
|
dquot = dqget(sb, *qid);
|
|
if (IS_ERR(dquot))
|
|
return PTR_ERR(dquot);
|
|
do_get_dqblk(dquot, di);
|
|
dqput(dquot);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(dquot_get_next_dqblk);
|
|
|
|
#define VFS_QC_MASK \
|
|
(QC_SPACE | QC_SPC_SOFT | QC_SPC_HARD | \
|
|
QC_INO_COUNT | QC_INO_SOFT | QC_INO_HARD | \
|
|
QC_SPC_TIMER | QC_INO_TIMER)
|
|
|
|
/* Generic routine for setting common part of quota structure */
|
|
static int do_set_dqblk(struct dquot *dquot, struct qc_dqblk *di)
|
|
{
|
|
struct mem_dqblk *dm = &dquot->dq_dqb;
|
|
int check_blim = 0, check_ilim = 0;
|
|
struct mem_dqinfo *dqi = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_id.type];
|
|
|
|
if (di->d_fieldmask & ~VFS_QC_MASK)
|
|
return -EINVAL;
|
|
|
|
if (((di->d_fieldmask & QC_SPC_SOFT) &&
|
|
di->d_spc_softlimit > dqi->dqi_max_spc_limit) ||
|
|
((di->d_fieldmask & QC_SPC_HARD) &&
|
|
di->d_spc_hardlimit > dqi->dqi_max_spc_limit) ||
|
|
((di->d_fieldmask & QC_INO_SOFT) &&
|
|
(di->d_ino_softlimit > dqi->dqi_max_ino_limit)) ||
|
|
((di->d_fieldmask & QC_INO_HARD) &&
|
|
(di->d_ino_hardlimit > dqi->dqi_max_ino_limit)))
|
|
return -ERANGE;
|
|
|
|
spin_lock(&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 = ktime_get_real_seconds() + dqi->dqi_bgrace;
|
|
}
|
|
if (check_ilim) {
|
|
if (!dm->dqb_isoftlimit ||
|
|
dm->dqb_curinodes < dm->dqb_isoftlimit) {
|
|
dm->dqb_itime = 0;
|
|
clear_bit(DQ_INODES_B, &dquot->dq_flags);
|
|
} else if (!(di->d_fieldmask & QC_INO_TIMER))
|
|
/* Set grace only if user hasn't provided his own... */
|
|
dm->dqb_itime = ktime_get_real_seconds() + dqi->dqi_igrace;
|
|
}
|
|
if (dm->dqb_bhardlimit || dm->dqb_bsoftlimit || dm->dqb_ihardlimit ||
|
|
dm->dqb_isoftlimit)
|
|
clear_bit(DQ_FAKE_B, &dquot->dq_flags);
|
|
else
|
|
set_bit(DQ_FAKE_B, &dquot->dq_flags);
|
|
spin_unlock(&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 (IS_ERR(dquot)) {
|
|
rc = PTR_ERR(dquot);
|
|
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_state(struct super_block *sb, struct qc_state *state)
|
|
{
|
|
struct mem_dqinfo *mi;
|
|
struct qc_type_state *tstate;
|
|
struct quota_info *dqopt = sb_dqopt(sb);
|
|
int type;
|
|
|
|
mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
|
|
memset(state, 0, sizeof(*state));
|
|
for (type = 0; type < MAXQUOTAS; type++) {
|
|
if (!sb_has_quota_active(sb, type))
|
|
continue;
|
|
tstate = state->s_state + type;
|
|
mi = sb_dqopt(sb)->info + type;
|
|
tstate->flags = QCI_ACCT_ENABLED;
|
|
spin_lock(&dq_data_lock);
|
|
if (mi->dqi_flags & DQF_SYS_FILE)
|
|
tstate->flags |= QCI_SYSFILE;
|
|
if (mi->dqi_flags & DQF_ROOT_SQUASH)
|
|
tstate->flags |= QCI_ROOT_SQUASH;
|
|
if (sb_has_quota_limits_enabled(sb, type))
|
|
tstate->flags |= QCI_LIMITS_ENFORCED;
|
|
tstate->spc_timelimit = mi->dqi_bgrace;
|
|
tstate->ino_timelimit = mi->dqi_igrace;
|
|
tstate->ino = dqopt->files[type]->i_ino;
|
|
tstate->blocks = dqopt->files[type]->i_blocks;
|
|
tstate->nextents = 1; /* We don't know... */
|
|
spin_unlock(&dq_data_lock);
|
|
}
|
|
mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(dquot_get_state);
|
|
|
|
/* Generic routine for setting common part of quota file information */
|
|
int dquot_set_dqinfo(struct super_block *sb, int type, struct qc_info *ii)
|
|
{
|
|
struct mem_dqinfo *mi;
|
|
int err = 0;
|
|
|
|
if ((ii->i_fieldmask & QC_WARNS_MASK) ||
|
|
(ii->i_fieldmask & QC_RT_SPC_TIMER))
|
|
return -EINVAL;
|
|
mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
|
|
if (!sb_has_quota_active(sb, type)) {
|
|
err = -ESRCH;
|
|
goto out;
|
|
}
|
|
mi = sb_dqopt(sb)->info + type;
|
|
if (ii->i_fieldmask & QC_FLAGS) {
|
|
if ((ii->i_flags & QCI_ROOT_SQUASH &&
|
|
mi->dqi_format->qf_fmt_id != QFMT_VFS_OLD)) {
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
}
|
|
spin_lock(&dq_data_lock);
|
|
if (ii->i_fieldmask & QC_SPC_TIMER)
|
|
mi->dqi_bgrace = ii->i_spc_timelimit;
|
|
if (ii->i_fieldmask & QC_INO_TIMER)
|
|
mi->dqi_igrace = ii->i_ino_timelimit;
|
|
if (ii->i_fieldmask & QC_FLAGS) {
|
|
if (ii->i_flags & QCI_ROOT_SQUASH)
|
|
mi->dqi_flags |= DQF_ROOT_SQUASH;
|
|
else
|
|
mi->dqi_flags &= ~DQF_ROOT_SQUASH;
|
|
}
|
|
spin_unlock(&dq_data_lock);
|
|
mark_info_dirty(sb, type);
|
|
/* Force write to disk */
|
|
sb->dq_op->write_info(sb, type);
|
|
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_state = dquot_get_state,
|
|
.set_info = dquot_set_dqinfo,
|
|
.get_dqblk = dquot_get_dqblk,
|
|
.get_nextdqblk = dquot_get_next_dqblk,
|
|
.set_dqblk = dquot_set_dqblk
|
|
};
|
|
EXPORT_SYMBOL(dquot_quotactl_ops);
|
|
|
|
const struct quotactl_ops dquot_quotactl_sysfile_ops = {
|
|
.quota_enable = dquot_quota_enable,
|
|
.quota_disable = dquot_quota_disable,
|
|
.quota_sync = dquot_quota_sync,
|
|
.get_state = dquot_get_state,
|
|
.set_info = dquot_set_dqinfo,
|
|
.get_dqblk = dquot_get_dqblk,
|
|
.get_nextdqblk = dquot_get_next_dqblk,
|
|
.set_dqblk = dquot_set_dqblk
|
|
};
|
|
EXPORT_SYMBOL(dquot_quotactl_sysfile_ops);
|
|
|
|
static int do_proc_dqstats(struct ctl_table *table, int write,
|
|
void __user *buffer, size_t *lenp, loff_t *ppos)
|
|
{
|
|
unsigned int type = (int *)table->data - dqstats.stat;
|
|
|
|
/* Update global table */
|
|
dqstats.stat[type] =
|
|
percpu_counter_sum_positive(&dqstats.counter[type]);
|
|
return proc_dointvec(table, write, buffer, lenp, ppos);
|
|
}
|
|
|
|
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);
|
|
|
|
pr_info("VFS: Dquot-cache hash table entries: %ld (order %ld,"
|
|
" %ld bytes)\n", nr_hash, order, (PAGE_SIZE << order));
|
|
|
|
register_shrinker(&dqcache_shrinker);
|
|
|
|
return 0;
|
|
}
|
|
fs_initcall(dquot_init);
|