| /* |
| * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. |
| * Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved. |
| * |
| * This copyrighted material is made available to anyone wishing to use, |
| * modify, copy, or redistribute it subject to the terms and conditions |
| * of the GNU General Public License version 2. |
| */ |
| |
| /* |
| * Quota change tags are associated with each transaction that allocates or |
| * deallocates space. Those changes are accumulated locally to each node (in a |
| * per-node file) and then are periodically synced to the quota file. This |
| * avoids the bottleneck of constantly touching the quota file, but introduces |
| * fuzziness in the current usage value of IDs that are being used on different |
| * nodes in the cluster simultaneously. So, it is possible for a user on |
| * multiple nodes to overrun their quota, but that overrun is controlable. |
| * Since quota tags are part of transactions, there is no need for a quota check |
| * program to be run on node crashes or anything like that. |
| * |
| * There are couple of knobs that let the administrator manage the quota |
| * fuzziness. "quota_quantum" sets the maximum time a quota change can be |
| * sitting on one node before being synced to the quota file. (The default is |
| * 60 seconds.) Another knob, "quota_scale" controls how quickly the frequency |
| * of quota file syncs increases as the user moves closer to their limit. The |
| * more frequent the syncs, the more accurate the quota enforcement, but that |
| * means that there is more contention between the nodes for the quota file. |
| * The default value is one. This sets the maximum theoretical quota overrun |
| * (with infinite node with infinite bandwidth) to twice the user's limit. (In |
| * practice, the maximum overrun you see should be much less.) A "quota_scale" |
| * number greater than one makes quota syncs more frequent and reduces the |
| * maximum overrun. Numbers less than one (but greater than zero) make quota |
| * syncs less frequent. |
| * |
| * GFS quotas also use per-ID Lock Value Blocks (LVBs) to cache the contents of |
| * the quota file, so it is not being constantly read. |
| */ |
| |
| #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| |
| #include <linux/sched.h> |
| #include <linux/slab.h> |
| #include <linux/mm.h> |
| #include <linux/spinlock.h> |
| #include <linux/completion.h> |
| #include <linux/buffer_head.h> |
| #include <linux/sort.h> |
| #include <linux/fs.h> |
| #include <linux/bio.h> |
| #include <linux/gfs2_ondisk.h> |
| #include <linux/kthread.h> |
| #include <linux/freezer.h> |
| #include <linux/quota.h> |
| #include <linux/dqblk_xfs.h> |
| #include <linux/lockref.h> |
| #include <linux/list_lru.h> |
| #include <linux/rcupdate.h> |
| #include <linux/rculist_bl.h> |
| #include <linux/bit_spinlock.h> |
| #include <linux/jhash.h> |
| #include <linux/vmalloc.h> |
| |
| #include "gfs2.h" |
| #include "incore.h" |
| #include "bmap.h" |
| #include "glock.h" |
| #include "glops.h" |
| #include "log.h" |
| #include "meta_io.h" |
| #include "quota.h" |
| #include "rgrp.h" |
| #include "super.h" |
| #include "trans.h" |
| #include "inode.h" |
| #include "util.h" |
| |
| #define GFS2_QD_HASH_SHIFT 12 |
| #define GFS2_QD_HASH_SIZE BIT(GFS2_QD_HASH_SHIFT) |
| #define GFS2_QD_HASH_MASK (GFS2_QD_HASH_SIZE - 1) |
| |
| /* Lock order: qd_lock -> bucket lock -> qd->lockref.lock -> lru lock */ |
| /* -> sd_bitmap_lock */ |
| static DEFINE_SPINLOCK(qd_lock); |
| struct list_lru gfs2_qd_lru; |
| |
| static struct hlist_bl_head qd_hash_table[GFS2_QD_HASH_SIZE]; |
| |
| static unsigned int gfs2_qd_hash(const struct gfs2_sbd *sdp, |
| const struct kqid qid) |
| { |
| unsigned int h; |
| |
| h = jhash(&sdp, sizeof(struct gfs2_sbd *), 0); |
| h = jhash(&qid, sizeof(struct kqid), h); |
| |
| return h & GFS2_QD_HASH_MASK; |
| } |
| |
| static inline void spin_lock_bucket(unsigned int hash) |
| { |
| hlist_bl_lock(&qd_hash_table[hash]); |
| } |
| |
| static inline void spin_unlock_bucket(unsigned int hash) |
| { |
| hlist_bl_unlock(&qd_hash_table[hash]); |
| } |
| |
| static void gfs2_qd_dealloc(struct rcu_head *rcu) |
| { |
| struct gfs2_quota_data *qd = container_of(rcu, struct gfs2_quota_data, qd_rcu); |
| kmem_cache_free(gfs2_quotad_cachep, qd); |
| } |
| |
| static void gfs2_qd_dispose(struct list_head *list) |
| { |
| struct gfs2_quota_data *qd; |
| struct gfs2_sbd *sdp; |
| |
| while (!list_empty(list)) { |
| qd = list_entry(list->next, struct gfs2_quota_data, qd_lru); |
| sdp = qd->qd_gl->gl_name.ln_sbd; |
| |
| list_del(&qd->qd_lru); |
| |
| /* Free from the filesystem-specific list */ |
| spin_lock(&qd_lock); |
| list_del(&qd->qd_list); |
| spin_unlock(&qd_lock); |
| |
| spin_lock_bucket(qd->qd_hash); |
| hlist_bl_del_rcu(&qd->qd_hlist); |
| spin_unlock_bucket(qd->qd_hash); |
| |
| gfs2_assert_warn(sdp, !qd->qd_change); |
| gfs2_assert_warn(sdp, !qd->qd_slot_count); |
| gfs2_assert_warn(sdp, !qd->qd_bh_count); |
| |
| gfs2_glock_put(qd->qd_gl); |
| atomic_dec(&sdp->sd_quota_count); |
| |
| /* Delete it from the common reclaim list */ |
| call_rcu(&qd->qd_rcu, gfs2_qd_dealloc); |
| } |
| } |
| |
| |
| static enum lru_status gfs2_qd_isolate(struct list_head *item, |
| struct list_lru_one *lru, spinlock_t *lru_lock, void *arg) |
| { |
| struct list_head *dispose = arg; |
| struct gfs2_quota_data *qd = list_entry(item, struct gfs2_quota_data, qd_lru); |
| |
| if (!spin_trylock(&qd->qd_lockref.lock)) |
| return LRU_SKIP; |
| |
| if (qd->qd_lockref.count == 0) { |
| lockref_mark_dead(&qd->qd_lockref); |
| list_lru_isolate_move(lru, &qd->qd_lru, dispose); |
| } |
| |
| spin_unlock(&qd->qd_lockref.lock); |
| return LRU_REMOVED; |
| } |
| |
| static unsigned long gfs2_qd_shrink_scan(struct shrinker *shrink, |
| struct shrink_control *sc) |
| { |
| LIST_HEAD(dispose); |
| unsigned long freed; |
| |
| if (!(sc->gfp_mask & __GFP_FS)) |
| return SHRINK_STOP; |
| |
| freed = list_lru_shrink_walk(&gfs2_qd_lru, sc, |
| gfs2_qd_isolate, &dispose); |
| |
| gfs2_qd_dispose(&dispose); |
| |
| return freed; |
| } |
| |
| static unsigned long gfs2_qd_shrink_count(struct shrinker *shrink, |
| struct shrink_control *sc) |
| { |
| return vfs_pressure_ratio(list_lru_shrink_count(&gfs2_qd_lru, sc)); |
| } |
| |
| struct shrinker gfs2_qd_shrinker = { |
| .count_objects = gfs2_qd_shrink_count, |
| .scan_objects = gfs2_qd_shrink_scan, |
| .seeks = DEFAULT_SEEKS, |
| .flags = SHRINKER_NUMA_AWARE, |
| }; |
| |
| |
| static u64 qd2index(struct gfs2_quota_data *qd) |
| { |
| struct kqid qid = qd->qd_id; |
| return (2 * (u64)from_kqid(&init_user_ns, qid)) + |
| ((qid.type == USRQUOTA) ? 0 : 1); |
| } |
| |
| static u64 qd2offset(struct gfs2_quota_data *qd) |
| { |
| u64 offset; |
| |
| offset = qd2index(qd); |
| offset *= sizeof(struct gfs2_quota); |
| |
| return offset; |
| } |
| |
| static struct gfs2_quota_data *qd_alloc(unsigned hash, struct gfs2_sbd *sdp, struct kqid qid) |
| { |
| struct gfs2_quota_data *qd; |
| int error; |
| |
| qd = kmem_cache_zalloc(gfs2_quotad_cachep, GFP_NOFS); |
| if (!qd) |
| return NULL; |
| |
| qd->qd_sbd = sdp; |
| qd->qd_lockref.count = 1; |
| spin_lock_init(&qd->qd_lockref.lock); |
| qd->qd_id = qid; |
| qd->qd_slot = -1; |
| INIT_LIST_HEAD(&qd->qd_lru); |
| qd->qd_hash = hash; |
| |
| error = gfs2_glock_get(sdp, qd2index(qd), |
| &gfs2_quota_glops, CREATE, &qd->qd_gl); |
| if (error) |
| goto fail; |
| |
| return qd; |
| |
| fail: |
| kmem_cache_free(gfs2_quotad_cachep, qd); |
| return NULL; |
| } |
| |
| static struct gfs2_quota_data *gfs2_qd_search_bucket(unsigned int hash, |
| const struct gfs2_sbd *sdp, |
| struct kqid qid) |
| { |
| struct gfs2_quota_data *qd; |
| struct hlist_bl_node *h; |
| |
| hlist_bl_for_each_entry_rcu(qd, h, &qd_hash_table[hash], qd_hlist) { |
| if (!qid_eq(qd->qd_id, qid)) |
| continue; |
| if (qd->qd_sbd != sdp) |
| continue; |
| if (lockref_get_not_dead(&qd->qd_lockref)) { |
| list_lru_del(&gfs2_qd_lru, &qd->qd_lru); |
| return qd; |
| } |
| } |
| |
| return NULL; |
| } |
| |
| |
| static int qd_get(struct gfs2_sbd *sdp, struct kqid qid, |
| struct gfs2_quota_data **qdp) |
| { |
| struct gfs2_quota_data *qd, *new_qd; |
| unsigned int hash = gfs2_qd_hash(sdp, qid); |
| |
| rcu_read_lock(); |
| *qdp = qd = gfs2_qd_search_bucket(hash, sdp, qid); |
| rcu_read_unlock(); |
| |
| if (qd) |
| return 0; |
| |
| new_qd = qd_alloc(hash, sdp, qid); |
| if (!new_qd) |
| return -ENOMEM; |
| |
| spin_lock(&qd_lock); |
| spin_lock_bucket(hash); |
| *qdp = qd = gfs2_qd_search_bucket(hash, sdp, qid); |
| if (qd == NULL) { |
| *qdp = new_qd; |
| list_add(&new_qd->qd_list, &sdp->sd_quota_list); |
| hlist_bl_add_head_rcu(&new_qd->qd_hlist, &qd_hash_table[hash]); |
| atomic_inc(&sdp->sd_quota_count); |
| } |
| spin_unlock_bucket(hash); |
| spin_unlock(&qd_lock); |
| |
| if (qd) { |
| gfs2_glock_put(new_qd->qd_gl); |
| kmem_cache_free(gfs2_quotad_cachep, new_qd); |
| } |
| |
| return 0; |
| } |
| |
| |
| static void qd_hold(struct gfs2_quota_data *qd) |
| { |
| struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd; |
| gfs2_assert(sdp, !__lockref_is_dead(&qd->qd_lockref)); |
| lockref_get(&qd->qd_lockref); |
| } |
| |
| static void qd_put(struct gfs2_quota_data *qd) |
| { |
| if (lockref_put_or_lock(&qd->qd_lockref)) |
| return; |
| |
| qd->qd_lockref.count = 0; |
| list_lru_add(&gfs2_qd_lru, &qd->qd_lru); |
| spin_unlock(&qd->qd_lockref.lock); |
| |
| } |
| |
| static int slot_get(struct gfs2_quota_data *qd) |
| { |
| struct gfs2_sbd *sdp = qd->qd_sbd; |
| unsigned int bit; |
| int error = 0; |
| |
| spin_lock(&sdp->sd_bitmap_lock); |
| if (qd->qd_slot_count != 0) |
| goto out; |
| |
| error = -ENOSPC; |
| bit = find_first_zero_bit(sdp->sd_quota_bitmap, sdp->sd_quota_slots); |
| if (bit < sdp->sd_quota_slots) { |
| set_bit(bit, sdp->sd_quota_bitmap); |
| qd->qd_slot = bit; |
| error = 0; |
| out: |
| qd->qd_slot_count++; |
| } |
| spin_unlock(&sdp->sd_bitmap_lock); |
| |
| return error; |
| } |
| |
| static void slot_hold(struct gfs2_quota_data *qd) |
| { |
| struct gfs2_sbd *sdp = qd->qd_sbd; |
| |
| spin_lock(&sdp->sd_bitmap_lock); |
| gfs2_assert(sdp, qd->qd_slot_count); |
| qd->qd_slot_count++; |
| spin_unlock(&sdp->sd_bitmap_lock); |
| } |
| |
| static void slot_put(struct gfs2_quota_data *qd) |
| { |
| struct gfs2_sbd *sdp = qd->qd_sbd; |
| |
| spin_lock(&sdp->sd_bitmap_lock); |
| gfs2_assert(sdp, qd->qd_slot_count); |
| if (!--qd->qd_slot_count) { |
| BUG_ON(!test_and_clear_bit(qd->qd_slot, sdp->sd_quota_bitmap)); |
| qd->qd_slot = -1; |
| } |
| spin_unlock(&sdp->sd_bitmap_lock); |
| } |
| |
| static int bh_get(struct gfs2_quota_data *qd) |
| { |
| struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd; |
| struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode); |
| unsigned int block, offset; |
| struct buffer_head *bh; |
| int error; |
| struct buffer_head bh_map = { .b_state = 0, .b_blocknr = 0 }; |
| |
| mutex_lock(&sdp->sd_quota_mutex); |
| |
| if (qd->qd_bh_count++) { |
| mutex_unlock(&sdp->sd_quota_mutex); |
| return 0; |
| } |
| |
| block = qd->qd_slot / sdp->sd_qc_per_block; |
| offset = qd->qd_slot % sdp->sd_qc_per_block; |
| |
| bh_map.b_size = BIT(ip->i_inode.i_blkbits); |
| error = gfs2_block_map(&ip->i_inode, block, &bh_map, 0); |
| if (error) |
| goto fail; |
| error = gfs2_meta_read(ip->i_gl, bh_map.b_blocknr, DIO_WAIT, 0, &bh); |
| if (error) |
| goto fail; |
| error = -EIO; |
| if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC)) |
| goto fail_brelse; |
| |
| qd->qd_bh = bh; |
| qd->qd_bh_qc = (struct gfs2_quota_change *) |
| (bh->b_data + sizeof(struct gfs2_meta_header) + |
| offset * sizeof(struct gfs2_quota_change)); |
| |
| mutex_unlock(&sdp->sd_quota_mutex); |
| |
| return 0; |
| |
| fail_brelse: |
| brelse(bh); |
| fail: |
| qd->qd_bh_count--; |
| mutex_unlock(&sdp->sd_quota_mutex); |
| return error; |
| } |
| |
| static void bh_put(struct gfs2_quota_data *qd) |
| { |
| struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd; |
| |
| mutex_lock(&sdp->sd_quota_mutex); |
| gfs2_assert(sdp, qd->qd_bh_count); |
| if (!--qd->qd_bh_count) { |
| brelse(qd->qd_bh); |
| qd->qd_bh = NULL; |
| qd->qd_bh_qc = NULL; |
| } |
| mutex_unlock(&sdp->sd_quota_mutex); |
| } |
| |
| static int qd_check_sync(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd, |
| u64 *sync_gen) |
| { |
| if (test_bit(QDF_LOCKED, &qd->qd_flags) || |
| !test_bit(QDF_CHANGE, &qd->qd_flags) || |
| (sync_gen && (qd->qd_sync_gen >= *sync_gen))) |
| return 0; |
| |
| if (!lockref_get_not_dead(&qd->qd_lockref)) |
| return 0; |
| |
| list_move_tail(&qd->qd_list, &sdp->sd_quota_list); |
| set_bit(QDF_LOCKED, &qd->qd_flags); |
| qd->qd_change_sync = qd->qd_change; |
| slot_hold(qd); |
| return 1; |
| } |
| |
| static int qd_fish(struct gfs2_sbd *sdp, struct gfs2_quota_data **qdp) |
| { |
| struct gfs2_quota_data *qd = NULL; |
| int error; |
| int found = 0; |
| |
| *qdp = NULL; |
| |
| if (sdp->sd_vfs->s_flags & MS_RDONLY) |
| return 0; |
| |
| spin_lock(&qd_lock); |
| |
| list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) { |
| found = qd_check_sync(sdp, qd, &sdp->sd_quota_sync_gen); |
| if (found) |
| break; |
| } |
| |
| if (!found) |
| qd = NULL; |
| |
| spin_unlock(&qd_lock); |
| |
| if (qd) { |
| gfs2_assert_warn(sdp, qd->qd_change_sync); |
| error = bh_get(qd); |
| if (error) { |
| clear_bit(QDF_LOCKED, &qd->qd_flags); |
| slot_put(qd); |
| qd_put(qd); |
| return error; |
| } |
| } |
| |
| *qdp = qd; |
| |
| return 0; |
| } |
| |
| static void qd_unlock(struct gfs2_quota_data *qd) |
| { |
| gfs2_assert_warn(qd->qd_gl->gl_name.ln_sbd, |
| test_bit(QDF_LOCKED, &qd->qd_flags)); |
| clear_bit(QDF_LOCKED, &qd->qd_flags); |
| bh_put(qd); |
| slot_put(qd); |
| qd_put(qd); |
| } |
| |
| static int qdsb_get(struct gfs2_sbd *sdp, struct kqid qid, |
| struct gfs2_quota_data **qdp) |
| { |
| int error; |
| |
| error = qd_get(sdp, qid, qdp); |
| if (error) |
| return error; |
| |
| error = slot_get(*qdp); |
| if (error) |
| goto fail; |
| |
| error = bh_get(*qdp); |
| if (error) |
| goto fail_slot; |
| |
| return 0; |
| |
| fail_slot: |
| slot_put(*qdp); |
| fail: |
| qd_put(*qdp); |
| return error; |
| } |
| |
| static void qdsb_put(struct gfs2_quota_data *qd) |
| { |
| bh_put(qd); |
| slot_put(qd); |
| qd_put(qd); |
| } |
| |
| /** |
| * gfs2_qa_alloc - make sure we have a quota allocations data structure, |
| * if necessary |
| * @ip: the inode for this reservation |
| */ |
| int gfs2_qa_alloc(struct gfs2_inode *ip) |
| { |
| int error = 0; |
| struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
| |
| if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF) |
| return 0; |
| |
| down_write(&ip->i_rw_mutex); |
| if (ip->i_qadata == NULL) { |
| ip->i_qadata = kmem_cache_zalloc(gfs2_qadata_cachep, GFP_NOFS); |
| if (!ip->i_qadata) |
| error = -ENOMEM; |
| } |
| up_write(&ip->i_rw_mutex); |
| return error; |
| } |
| |
| void gfs2_qa_delete(struct gfs2_inode *ip, atomic_t *wcount) |
| { |
| down_write(&ip->i_rw_mutex); |
| if (ip->i_qadata && ((wcount == NULL) || (atomic_read(wcount) <= 1))) { |
| kmem_cache_free(gfs2_qadata_cachep, ip->i_qadata); |
| ip->i_qadata = NULL; |
| } |
| up_write(&ip->i_rw_mutex); |
| } |
| |
| int gfs2_quota_hold(struct gfs2_inode *ip, kuid_t uid, kgid_t gid) |
| { |
| struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
| struct gfs2_quota_data **qd; |
| int error; |
| |
| if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF) |
| return 0; |
| |
| if (ip->i_qadata == NULL) { |
| error = gfs2_rsqa_alloc(ip); |
| if (error) |
| return error; |
| } |
| |
| qd = ip->i_qadata->qa_qd; |
| |
| if (gfs2_assert_warn(sdp, !ip->i_qadata->qa_qd_num) || |
| gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags))) |
| return -EIO; |
| |
| error = qdsb_get(sdp, make_kqid_uid(ip->i_inode.i_uid), qd); |
| if (error) |
| goto out; |
| ip->i_qadata->qa_qd_num++; |
| qd++; |
| |
| error = qdsb_get(sdp, make_kqid_gid(ip->i_inode.i_gid), qd); |
| if (error) |
| goto out; |
| ip->i_qadata->qa_qd_num++; |
| qd++; |
| |
| if (!uid_eq(uid, NO_UID_QUOTA_CHANGE) && |
| !uid_eq(uid, ip->i_inode.i_uid)) { |
| error = qdsb_get(sdp, make_kqid_uid(uid), qd); |
| if (error) |
| goto out; |
| ip->i_qadata->qa_qd_num++; |
| qd++; |
| } |
| |
| if (!gid_eq(gid, NO_GID_QUOTA_CHANGE) && |
| !gid_eq(gid, ip->i_inode.i_gid)) { |
| error = qdsb_get(sdp, make_kqid_gid(gid), qd); |
| if (error) |
| goto out; |
| ip->i_qadata->qa_qd_num++; |
| qd++; |
| } |
| |
| out: |
| if (error) |
| gfs2_quota_unhold(ip); |
| return error; |
| } |
| |
| void gfs2_quota_unhold(struct gfs2_inode *ip) |
| { |
| struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
| u32 x; |
| |
| if (ip->i_qadata == NULL) |
| return; |
| gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags)); |
| |
| for (x = 0; x < ip->i_qadata->qa_qd_num; x++) { |
| qdsb_put(ip->i_qadata->qa_qd[x]); |
| ip->i_qadata->qa_qd[x] = NULL; |
| } |
| ip->i_qadata->qa_qd_num = 0; |
| } |
| |
| static int sort_qd(const void *a, const void *b) |
| { |
| const struct gfs2_quota_data *qd_a = *(const struct gfs2_quota_data **)a; |
| const struct gfs2_quota_data *qd_b = *(const struct gfs2_quota_data **)b; |
| |
| if (qid_lt(qd_a->qd_id, qd_b->qd_id)) |
| return -1; |
| if (qid_lt(qd_b->qd_id, qd_a->qd_id)) |
| return 1; |
| return 0; |
| } |
| |
| static void do_qc(struct gfs2_quota_data *qd, s64 change) |
| { |
| struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd; |
| struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode); |
| struct gfs2_quota_change *qc = qd->qd_bh_qc; |
| s64 x; |
| |
| mutex_lock(&sdp->sd_quota_mutex); |
| gfs2_trans_add_meta(ip->i_gl, qd->qd_bh); |
| |
| if (!test_bit(QDF_CHANGE, &qd->qd_flags)) { |
| qc->qc_change = 0; |
| qc->qc_flags = 0; |
| if (qd->qd_id.type == USRQUOTA) |
| qc->qc_flags = cpu_to_be32(GFS2_QCF_USER); |
| qc->qc_id = cpu_to_be32(from_kqid(&init_user_ns, qd->qd_id)); |
| } |
| |
| x = be64_to_cpu(qc->qc_change) + change; |
| qc->qc_change = cpu_to_be64(x); |
| |
| spin_lock(&qd_lock); |
| qd->qd_change = x; |
| spin_unlock(&qd_lock); |
| |
| if (!x) { |
| gfs2_assert_warn(sdp, test_bit(QDF_CHANGE, &qd->qd_flags)); |
| clear_bit(QDF_CHANGE, &qd->qd_flags); |
| qc->qc_flags = 0; |
| qc->qc_id = 0; |
| slot_put(qd); |
| qd_put(qd); |
| } else if (!test_and_set_bit(QDF_CHANGE, &qd->qd_flags)) { |
| qd_hold(qd); |
| slot_hold(qd); |
| } |
| |
| if (change < 0) /* Reset quiet flag if we freed some blocks */ |
| clear_bit(QDF_QMSG_QUIET, &qd->qd_flags); |
| mutex_unlock(&sdp->sd_quota_mutex); |
| } |
| |
| static int gfs2_write_buf_to_page(struct gfs2_inode *ip, unsigned long index, |
| unsigned off, void *buf, unsigned bytes) |
| { |
| struct inode *inode = &ip->i_inode; |
| struct gfs2_sbd *sdp = GFS2_SB(inode); |
| struct address_space *mapping = inode->i_mapping; |
| struct page *page; |
| struct buffer_head *bh; |
| void *kaddr; |
| u64 blk; |
| unsigned bsize = sdp->sd_sb.sb_bsize, bnum = 0, boff = 0; |
| unsigned to_write = bytes, pg_off = off; |
| int done = 0; |
| |
| blk = index << (PAGE_SHIFT - sdp->sd_sb.sb_bsize_shift); |
| boff = off % bsize; |
| |
| page = find_or_create_page(mapping, index, GFP_NOFS); |
| if (!page) |
| return -ENOMEM; |
| if (!page_has_buffers(page)) |
| create_empty_buffers(page, bsize, 0); |
| |
| bh = page_buffers(page); |
| while (!done) { |
| /* Find the beginning block within the page */ |
| if (pg_off >= ((bnum * bsize) + bsize)) { |
| bh = bh->b_this_page; |
| bnum++; |
| blk++; |
| continue; |
| } |
| if (!buffer_mapped(bh)) { |
| gfs2_block_map(inode, blk, bh, 1); |
| if (!buffer_mapped(bh)) |
| goto unlock_out; |
| /* If it's a newly allocated disk block, zero it */ |
| if (buffer_new(bh)) |
| zero_user(page, bnum * bsize, bh->b_size); |
| } |
| if (PageUptodate(page)) |
| set_buffer_uptodate(bh); |
| if (!buffer_uptodate(bh)) { |
| ll_rw_block(REQ_OP_READ, REQ_META, 1, &bh); |
| wait_on_buffer(bh); |
| if (!buffer_uptodate(bh)) |
| goto unlock_out; |
| } |
| gfs2_trans_add_data(ip->i_gl, bh); |
| |
| /* If we need to write to the next block as well */ |
| if (to_write > (bsize - boff)) { |
| pg_off += (bsize - boff); |
| to_write -= (bsize - boff); |
| boff = pg_off % bsize; |
| continue; |
| } |
| done = 1; |
| } |
| |
| /* Write to the page, now that we have setup the buffer(s) */ |
| kaddr = kmap_atomic(page); |
| memcpy(kaddr + off, buf, bytes); |
| flush_dcache_page(page); |
| kunmap_atomic(kaddr); |
| unlock_page(page); |
| put_page(page); |
| |
| return 0; |
| |
| unlock_out: |
| unlock_page(page); |
| put_page(page); |
| return -EIO; |
| } |
| |
| static int gfs2_write_disk_quota(struct gfs2_inode *ip, struct gfs2_quota *qp, |
| loff_t loc) |
| { |
| unsigned long pg_beg; |
| unsigned pg_off, nbytes, overflow = 0; |
| int pg_oflow = 0, error; |
| void *ptr; |
| |
| nbytes = sizeof(struct gfs2_quota); |
| |
| pg_beg = loc >> PAGE_SHIFT; |
| pg_off = loc % PAGE_SIZE; |
| |
| /* If the quota straddles a page boundary, split the write in two */ |
| if ((pg_off + nbytes) > PAGE_SIZE) { |
| pg_oflow = 1; |
| overflow = (pg_off + nbytes) - PAGE_SIZE; |
| } |
| |
| ptr = qp; |
| error = gfs2_write_buf_to_page(ip, pg_beg, pg_off, ptr, |
| nbytes - overflow); |
| /* If there's an overflow, write the remaining bytes to the next page */ |
| if (!error && pg_oflow) |
| error = gfs2_write_buf_to_page(ip, pg_beg + 1, 0, |
| ptr + nbytes - overflow, |
| overflow); |
| return error; |
| } |
| |
| /** |
| * gfs2_adjust_quota - adjust record of current block usage |
| * @ip: The quota inode |
| * @loc: Offset of the entry in the quota file |
| * @change: The amount of usage change to record |
| * @qd: The quota data |
| * @fdq: The updated limits to record |
| * |
| * This function was mostly borrowed from gfs2_block_truncate_page which was |
| * in turn mostly borrowed from ext3 |
| * |
| * Returns: 0 or -ve on error |
| */ |
| |
| static int gfs2_adjust_quota(struct gfs2_inode *ip, loff_t loc, |
| s64 change, struct gfs2_quota_data *qd, |
| struct qc_dqblk *fdq) |
| { |
| struct inode *inode = &ip->i_inode; |
| struct gfs2_sbd *sdp = GFS2_SB(inode); |
| struct gfs2_quota q; |
| int err; |
| u64 size; |
| |
| if (gfs2_is_stuffed(ip)) { |
| err = gfs2_unstuff_dinode(ip, NULL); |
| if (err) |
| return err; |
| } |
| |
| memset(&q, 0, sizeof(struct gfs2_quota)); |
| err = gfs2_internal_read(ip, (char *)&q, &loc, sizeof(q)); |
| if (err < 0) |
| return err; |
| |
| loc -= sizeof(q); /* gfs2_internal_read would've advanced the loc ptr */ |
| err = -EIO; |
| be64_add_cpu(&q.qu_value, change); |
| if (((s64)be64_to_cpu(q.qu_value)) < 0) |
| q.qu_value = 0; /* Never go negative on quota usage */ |
| qd->qd_qb.qb_value = q.qu_value; |
| if (fdq) { |
| if (fdq->d_fieldmask & QC_SPC_SOFT) { |
| q.qu_warn = cpu_to_be64(fdq->d_spc_softlimit >> sdp->sd_sb.sb_bsize_shift); |
| qd->qd_qb.qb_warn = q.qu_warn; |
| } |
| if (fdq->d_fieldmask & QC_SPC_HARD) { |
| q.qu_limit = cpu_to_be64(fdq->d_spc_hardlimit >> sdp->sd_sb.sb_bsize_shift); |
| qd->qd_qb.qb_limit = q.qu_limit; |
| } |
| if (fdq->d_fieldmask & QC_SPACE) { |
| q.qu_value = cpu_to_be64(fdq->d_space >> sdp->sd_sb.sb_bsize_shift); |
| qd->qd_qb.qb_value = q.qu_value; |
| } |
| } |
| |
| err = gfs2_write_disk_quota(ip, &q, loc); |
| if (!err) { |
| size = loc + sizeof(struct gfs2_quota); |
| if (size > inode->i_size) |
| i_size_write(inode, size); |
| inode->i_mtime = inode->i_atime = CURRENT_TIME; |
| mark_inode_dirty(inode); |
| set_bit(QDF_REFRESH, &qd->qd_flags); |
| } |
| |
| return err; |
| } |
| |
| static int do_sync(unsigned int num_qd, struct gfs2_quota_data **qda) |
| { |
| struct gfs2_sbd *sdp = (*qda)->qd_gl->gl_name.ln_sbd; |
| struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode); |
| struct gfs2_alloc_parms ap = { .aflags = 0, }; |
| unsigned int data_blocks, ind_blocks; |
| struct gfs2_holder *ghs, i_gh; |
| unsigned int qx, x; |
| struct gfs2_quota_data *qd; |
| unsigned reserved; |
| loff_t offset; |
| unsigned int nalloc = 0, blocks; |
| int error; |
| |
| error = gfs2_rsqa_alloc(ip); |
| if (error) |
| return error; |
| |
| gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota), |
| &data_blocks, &ind_blocks); |
| |
| ghs = kmalloc(num_qd * sizeof(struct gfs2_holder), GFP_NOFS); |
| if (!ghs) |
| return -ENOMEM; |
| |
| sort(qda, num_qd, sizeof(struct gfs2_quota_data *), sort_qd, NULL); |
| inode_lock(&ip->i_inode); |
| for (qx = 0; qx < num_qd; qx++) { |
| error = gfs2_glock_nq_init(qda[qx]->qd_gl, LM_ST_EXCLUSIVE, |
| GL_NOCACHE, &ghs[qx]); |
| if (error) |
| goto out; |
| } |
| |
| error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh); |
| if (error) |
| goto out; |
| |
| for (x = 0; x < num_qd; x++) { |
| offset = qd2offset(qda[x]); |
| if (gfs2_write_alloc_required(ip, offset, |
| sizeof(struct gfs2_quota))) |
| nalloc++; |
| } |
| |
| /* |
| * 1 blk for unstuffing inode if stuffed. We add this extra |
| * block to the reservation unconditionally. If the inode |
| * doesn't need unstuffing, the block will be released to the |
| * rgrp since it won't be allocated during the transaction |
| */ |
| /* +3 in the end for unstuffing block, inode size update block |
| * and another block in case quota straddles page boundary and |
| * two blocks need to be updated instead of 1 */ |
| blocks = num_qd * data_blocks + RES_DINODE + num_qd + 3; |
| |
| reserved = 1 + (nalloc * (data_blocks + ind_blocks)); |
| ap.target = reserved; |
| error = gfs2_inplace_reserve(ip, &ap); |
| if (error) |
| goto out_alloc; |
| |
| if (nalloc) |
| blocks += gfs2_rg_blocks(ip, reserved) + nalloc * ind_blocks + RES_STATFS; |
| |
| error = gfs2_trans_begin(sdp, blocks, 0); |
| if (error) |
| goto out_ipres; |
| |
| for (x = 0; x < num_qd; x++) { |
| qd = qda[x]; |
| offset = qd2offset(qd); |
| error = gfs2_adjust_quota(ip, offset, qd->qd_change_sync, qd, NULL); |
| if (error) |
| goto out_end_trans; |
| |
| do_qc(qd, -qd->qd_change_sync); |
| set_bit(QDF_REFRESH, &qd->qd_flags); |
| } |
| |
| error = 0; |
| |
| out_end_trans: |
| gfs2_trans_end(sdp); |
| out_ipres: |
| gfs2_inplace_release(ip); |
| out_alloc: |
| gfs2_glock_dq_uninit(&i_gh); |
| out: |
| while (qx--) |
| gfs2_glock_dq_uninit(&ghs[qx]); |
| inode_unlock(&ip->i_inode); |
| kfree(ghs); |
| gfs2_log_flush(ip->i_gl->gl_name.ln_sbd, ip->i_gl, NORMAL_FLUSH); |
| return error; |
| } |
| |
| static int update_qd(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd) |
| { |
| struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode); |
| struct gfs2_quota q; |
| struct gfs2_quota_lvb *qlvb; |
| loff_t pos; |
| int error; |
| |
| memset(&q, 0, sizeof(struct gfs2_quota)); |
| pos = qd2offset(qd); |
| error = gfs2_internal_read(ip, (char *)&q, &pos, sizeof(q)); |
| if (error < 0) |
| return error; |
| |
| qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr; |
| qlvb->qb_magic = cpu_to_be32(GFS2_MAGIC); |
| qlvb->__pad = 0; |
| qlvb->qb_limit = q.qu_limit; |
| qlvb->qb_warn = q.qu_warn; |
| qlvb->qb_value = q.qu_value; |
| qd->qd_qb = *qlvb; |
| |
| return 0; |
| } |
| |
| static int do_glock(struct gfs2_quota_data *qd, int force_refresh, |
| struct gfs2_holder *q_gh) |
| { |
| struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd; |
| struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode); |
| struct gfs2_holder i_gh; |
| int error; |
| |
| restart: |
| error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_SHARED, 0, q_gh); |
| if (error) |
| return error; |
| |
| if (test_and_clear_bit(QDF_REFRESH, &qd->qd_flags)) |
| force_refresh = FORCE; |
| |
| qd->qd_qb = *(struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr; |
| |
| if (force_refresh || qd->qd_qb.qb_magic != cpu_to_be32(GFS2_MAGIC)) { |
| gfs2_glock_dq_uninit(q_gh); |
| error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE, |
| GL_NOCACHE, q_gh); |
| if (error) |
| return error; |
| |
| error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh); |
| if (error) |
| goto fail; |
| |
| error = update_qd(sdp, qd); |
| if (error) |
| goto fail_gunlock; |
| |
| gfs2_glock_dq_uninit(&i_gh); |
| gfs2_glock_dq_uninit(q_gh); |
| force_refresh = 0; |
| goto restart; |
| } |
| |
| return 0; |
| |
| fail_gunlock: |
| gfs2_glock_dq_uninit(&i_gh); |
| fail: |
| gfs2_glock_dq_uninit(q_gh); |
| return error; |
| } |
| |
| int gfs2_quota_lock(struct gfs2_inode *ip, kuid_t uid, kgid_t gid) |
| { |
| struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
| struct gfs2_quota_data *qd; |
| u32 x; |
| int error = 0; |
| |
| if (capable(CAP_SYS_RESOURCE) || |
| sdp->sd_args.ar_quota != GFS2_QUOTA_ON) |
| return 0; |
| |
| error = gfs2_quota_hold(ip, uid, gid); |
| if (error) |
| return error; |
| |
| sort(ip->i_qadata->qa_qd, ip->i_qadata->qa_qd_num, |
| sizeof(struct gfs2_quota_data *), sort_qd, NULL); |
| |
| for (x = 0; x < ip->i_qadata->qa_qd_num; x++) { |
| qd = ip->i_qadata->qa_qd[x]; |
| error = do_glock(qd, NO_FORCE, &ip->i_qadata->qa_qd_ghs[x]); |
| if (error) |
| break; |
| } |
| |
| if (!error) |
| set_bit(GIF_QD_LOCKED, &ip->i_flags); |
| else { |
| while (x--) |
| gfs2_glock_dq_uninit(&ip->i_qadata->qa_qd_ghs[x]); |
| gfs2_quota_unhold(ip); |
| } |
| |
| return error; |
| } |
| |
| static int need_sync(struct gfs2_quota_data *qd) |
| { |
| struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd; |
| struct gfs2_tune *gt = &sdp->sd_tune; |
| s64 value; |
| unsigned int num, den; |
| int do_sync = 1; |
| |
| if (!qd->qd_qb.qb_limit) |
| return 0; |
| |
| spin_lock(&qd_lock); |
| value = qd->qd_change; |
| spin_unlock(&qd_lock); |
| |
| spin_lock(>->gt_spin); |
| num = gt->gt_quota_scale_num; |
| den = gt->gt_quota_scale_den; |
| spin_unlock(>->gt_spin); |
| |
| if (value < 0) |
| do_sync = 0; |
| else if ((s64)be64_to_cpu(qd->qd_qb.qb_value) >= |
| (s64)be64_to_cpu(qd->qd_qb.qb_limit)) |
| do_sync = 0; |
| else { |
| value *= gfs2_jindex_size(sdp) * num; |
| value = div_s64(value, den); |
| value += (s64)be64_to_cpu(qd->qd_qb.qb_value); |
| if (value < (s64)be64_to_cpu(qd->qd_qb.qb_limit)) |
| do_sync = 0; |
| } |
| |
| return do_sync; |
| } |
| |
| void gfs2_quota_unlock(struct gfs2_inode *ip) |
| { |
| struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
| struct gfs2_quota_data *qda[4]; |
| unsigned int count = 0; |
| u32 x; |
| int found; |
| |
| if (!test_and_clear_bit(GIF_QD_LOCKED, &ip->i_flags)) |
| goto out; |
| |
| for (x = 0; x < ip->i_qadata->qa_qd_num; x++) { |
| struct gfs2_quota_data *qd; |
| int sync; |
| |
| qd = ip->i_qadata->qa_qd[x]; |
| sync = need_sync(qd); |
| |
| gfs2_glock_dq_uninit(&ip->i_qadata->qa_qd_ghs[x]); |
| if (!sync) |
| continue; |
| |
| spin_lock(&qd_lock); |
| found = qd_check_sync(sdp, qd, NULL); |
| spin_unlock(&qd_lock); |
| |
| if (!found) |
| continue; |
| |
| gfs2_assert_warn(sdp, qd->qd_change_sync); |
| if (bh_get(qd)) { |
| clear_bit(QDF_LOCKED, &qd->qd_flags); |
| slot_put(qd); |
| qd_put(qd); |
| continue; |
| } |
| |
| qda[count++] = qd; |
| } |
| |
| if (count) { |
| do_sync(count, qda); |
| for (x = 0; x < count; x++) |
| qd_unlock(qda[x]); |
| } |
| |
| out: |
| gfs2_quota_unhold(ip); |
| } |
| |
| #define MAX_LINE 256 |
| |
| static int print_message(struct gfs2_quota_data *qd, char *type) |
| { |
| struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd; |
| |
| fs_info(sdp, "quota %s for %s %u\n", |
| type, |
| (qd->qd_id.type == USRQUOTA) ? "user" : "group", |
| from_kqid(&init_user_ns, qd->qd_id)); |
| |
| return 0; |
| } |
| |
| /** |
| * gfs2_quota_check - check if allocating new blocks will exceed quota |
| * @ip: The inode for which this check is being performed |
| * @uid: The uid to check against |
| * @gid: The gid to check against |
| * @ap: The allocation parameters. ap->target contains the requested |
| * blocks. ap->min_target, if set, contains the minimum blks |
| * requested. |
| * |
| * Returns: 0 on success. |
| * min_req = ap->min_target ? ap->min_target : ap->target; |
| * quota must allow atleast min_req blks for success and |
| * ap->allowed is set to the number of blocks allowed |
| * |
| * -EDQUOT otherwise, quota violation. ap->allowed is set to number |
| * of blocks available. |
| */ |
| int gfs2_quota_check(struct gfs2_inode *ip, kuid_t uid, kgid_t gid, |
| struct gfs2_alloc_parms *ap) |
| { |
| struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
| struct gfs2_quota_data *qd; |
| s64 value, warn, limit; |
| u32 x; |
| int error = 0; |
| |
| ap->allowed = UINT_MAX; /* Assume we are permitted a whole lot */ |
| if (!test_bit(GIF_QD_LOCKED, &ip->i_flags)) |
| return 0; |
| |
| if (sdp->sd_args.ar_quota != GFS2_QUOTA_ON) |
| return 0; |
| |
| for (x = 0; x < ip->i_qadata->qa_qd_num; x++) { |
| qd = ip->i_qadata->qa_qd[x]; |
| |
| if (!(qid_eq(qd->qd_id, make_kqid_uid(uid)) || |
| qid_eq(qd->qd_id, make_kqid_gid(gid)))) |
| continue; |
| |
| warn = (s64)be64_to_cpu(qd->qd_qb.qb_warn); |
| limit = (s64)be64_to_cpu(qd->qd_qb.qb_limit); |
| value = (s64)be64_to_cpu(qd->qd_qb.qb_value); |
| spin_lock(&qd_lock); |
| value += qd->qd_change; |
| spin_unlock(&qd_lock); |
| |
| if (limit > 0 && (limit - value) < ap->allowed) |
| ap->allowed = limit - value; |
| /* If we can't meet the target */ |
| if (limit && limit < (value + (s64)ap->target)) { |
| /* If no min_target specified or we don't meet |
| * min_target, return -EDQUOT */ |
| if (!ap->min_target || ap->min_target > ap->allowed) { |
| if (!test_and_set_bit(QDF_QMSG_QUIET, |
| &qd->qd_flags)) { |
| print_message(qd, "exceeded"); |
| quota_send_warning(qd->qd_id, |
| sdp->sd_vfs->s_dev, |
| QUOTA_NL_BHARDWARN); |
| } |
| error = -EDQUOT; |
| break; |
| } |
| } else if (warn && warn < value && |
| time_after_eq(jiffies, qd->qd_last_warn + |
| gfs2_tune_get(sdp, gt_quota_warn_period) |
| * HZ)) { |
| quota_send_warning(qd->qd_id, |
| sdp->sd_vfs->s_dev, QUOTA_NL_BSOFTWARN); |
| error = print_message(qd, "warning"); |
| qd->qd_last_warn = jiffies; |
| } |
| } |
| return error; |
| } |
| |
| void gfs2_quota_change(struct gfs2_inode *ip, s64 change, |
| kuid_t uid, kgid_t gid) |
| { |
| struct gfs2_quota_data *qd; |
| u32 x; |
| struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
| |
| if (sdp->sd_args.ar_quota != GFS2_QUOTA_ON || |
| gfs2_assert_warn(sdp, change)) |
| return; |
| if (ip->i_diskflags & GFS2_DIF_SYSTEM) |
| return; |
| |
| for (x = 0; x < ip->i_qadata->qa_qd_num; x++) { |
| qd = ip->i_qadata->qa_qd[x]; |
| |
| if (qid_eq(qd->qd_id, make_kqid_uid(uid)) || |
| qid_eq(qd->qd_id, make_kqid_gid(gid))) { |
| do_qc(qd, change); |
| } |
| } |
| } |
| |
| int gfs2_quota_sync(struct super_block *sb, int type) |
| { |
| struct gfs2_sbd *sdp = sb->s_fs_info; |
| struct gfs2_quota_data **qda; |
| unsigned int max_qd = PAGE_SIZE/sizeof(struct gfs2_holder); |
| unsigned int num_qd; |
| unsigned int x; |
| int error = 0; |
| |
| qda = kcalloc(max_qd, sizeof(struct gfs2_quota_data *), GFP_KERNEL); |
| if (!qda) |
| return -ENOMEM; |
| |
| mutex_lock(&sdp->sd_quota_sync_mutex); |
| sdp->sd_quota_sync_gen++; |
| |
| do { |
| num_qd = 0; |
| |
| for (;;) { |
| error = qd_fish(sdp, qda + num_qd); |
| if (error || !qda[num_qd]) |
| break; |
| if (++num_qd == max_qd) |
| break; |
| } |
| |
| if (num_qd) { |
| if (!error) |
| error = do_sync(num_qd, qda); |
| if (!error) |
| for (x = 0; x < num_qd; x++) |
| qda[x]->qd_sync_gen = |
| sdp->sd_quota_sync_gen; |
| |
| for (x = 0; x < num_qd; x++) |
| qd_unlock(qda[x]); |
| } |
| } while (!error && num_qd == max_qd); |
| |
| mutex_unlock(&sdp->sd_quota_sync_mutex); |
| kfree(qda); |
| |
| return error; |
| } |
| |
| int gfs2_quota_refresh(struct gfs2_sbd *sdp, struct kqid qid) |
| { |
| struct gfs2_quota_data *qd; |
| struct gfs2_holder q_gh; |
| int error; |
| |
| error = qd_get(sdp, qid, &qd); |
| if (error) |
| return error; |
| |
| error = do_glock(qd, FORCE, &q_gh); |
| if (!error) |
| gfs2_glock_dq_uninit(&q_gh); |
| |
| qd_put(qd); |
| return error; |
| } |
| |
| int gfs2_quota_init(struct gfs2_sbd *sdp) |
| { |
| struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode); |
| u64 size = i_size_read(sdp->sd_qc_inode); |
| unsigned int blocks = size >> sdp->sd_sb.sb_bsize_shift; |
| unsigned int x, slot = 0; |
| unsigned int found = 0; |
| unsigned int hash; |
| unsigned int bm_size; |
| u64 dblock; |
| u32 extlen = 0; |
| int error; |
| |
| if (gfs2_check_internal_file_size(sdp->sd_qc_inode, 1, 64 << 20)) |
| return -EIO; |
| |
| sdp->sd_quota_slots = blocks * sdp->sd_qc_per_block; |
| bm_size = DIV_ROUND_UP(sdp->sd_quota_slots, 8 * sizeof(unsigned long)); |
| bm_size *= sizeof(unsigned long); |
| error = -ENOMEM; |
| sdp->sd_quota_bitmap = kzalloc(bm_size, GFP_NOFS | __GFP_NOWARN); |
| if (sdp->sd_quota_bitmap == NULL) |
| sdp->sd_quota_bitmap = __vmalloc(bm_size, GFP_NOFS | |
| __GFP_ZERO, PAGE_KERNEL); |
| if (!sdp->sd_quota_bitmap) |
| return error; |
| |
| for (x = 0; x < blocks; x++) { |
| struct buffer_head *bh; |
| const struct gfs2_quota_change *qc; |
| unsigned int y; |
| |
| if (!extlen) { |
| int new = 0; |
| error = gfs2_extent_map(&ip->i_inode, x, &new, &dblock, &extlen); |
| if (error) |
| goto fail; |
| } |
| error = -EIO; |
| bh = gfs2_meta_ra(ip->i_gl, dblock, extlen); |
| if (!bh) |
| goto fail; |
| if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC)) { |
| brelse(bh); |
| goto fail; |
| } |
| |
| qc = (const struct gfs2_quota_change *)(bh->b_data + sizeof(struct gfs2_meta_header)); |
| for (y = 0; y < sdp->sd_qc_per_block && slot < sdp->sd_quota_slots; |
| y++, slot++) { |
| struct gfs2_quota_data *qd; |
| s64 qc_change = be64_to_cpu(qc->qc_change); |
| u32 qc_flags = be32_to_cpu(qc->qc_flags); |
| enum quota_type qtype = (qc_flags & GFS2_QCF_USER) ? |
| USRQUOTA : GRPQUOTA; |
| struct kqid qc_id = make_kqid(&init_user_ns, qtype, |
| be32_to_cpu(qc->qc_id)); |
| qc++; |
| if (!qc_change) |
| continue; |
| |
| hash = gfs2_qd_hash(sdp, qc_id); |
| qd = qd_alloc(hash, sdp, qc_id); |
| if (qd == NULL) { |
| brelse(bh); |
| goto fail; |
| } |
| |
| set_bit(QDF_CHANGE, &qd->qd_flags); |
| qd->qd_change = qc_change; |
| qd->qd_slot = slot; |
| qd->qd_slot_count = 1; |
| |
| spin_lock(&qd_lock); |
| BUG_ON(test_and_set_bit(slot, sdp->sd_quota_bitmap)); |
| list_add(&qd->qd_list, &sdp->sd_quota_list); |
| atomic_inc(&sdp->sd_quota_count); |
| spin_unlock(&qd_lock); |
| |
| spin_lock_bucket(hash); |
| hlist_bl_add_head_rcu(&qd->qd_hlist, &qd_hash_table[hash]); |
| spin_unlock_bucket(hash); |
| |
| found++; |
| } |
| |
| brelse(bh); |
| dblock++; |
| extlen--; |
| } |
| |
| if (found) |
| fs_info(sdp, "found %u quota changes\n", found); |
| |
| return 0; |
| |
| fail: |
| gfs2_quota_cleanup(sdp); |
| return error; |
| } |
| |
| void gfs2_quota_cleanup(struct gfs2_sbd *sdp) |
| { |
| struct list_head *head = &sdp->sd_quota_list; |
| struct gfs2_quota_data *qd; |
| |
| spin_lock(&qd_lock); |
| while (!list_empty(head)) { |
| qd = list_entry(head->prev, struct gfs2_quota_data, qd_list); |
| |
| list_del(&qd->qd_list); |
| |
| /* Also remove if this qd exists in the reclaim list */ |
| list_lru_del(&gfs2_qd_lru, &qd->qd_lru); |
| atomic_dec(&sdp->sd_quota_count); |
| spin_unlock(&qd_lock); |
| |
| spin_lock_bucket(qd->qd_hash); |
| hlist_bl_del_rcu(&qd->qd_hlist); |
| spin_unlock_bucket(qd->qd_hash); |
| |
| gfs2_assert_warn(sdp, !qd->qd_change); |
| gfs2_assert_warn(sdp, !qd->qd_slot_count); |
| gfs2_assert_warn(sdp, !qd->qd_bh_count); |
| |
| gfs2_glock_put(qd->qd_gl); |
| call_rcu(&qd->qd_rcu, gfs2_qd_dealloc); |
| |
| spin_lock(&qd_lock); |
| } |
| spin_unlock(&qd_lock); |
| |
| gfs2_assert_warn(sdp, !atomic_read(&sdp->sd_quota_count)); |
| |
| kvfree(sdp->sd_quota_bitmap); |
| sdp->sd_quota_bitmap = NULL; |
| } |
| |
| static void quotad_error(struct gfs2_sbd *sdp, const char *msg, int error) |
| { |
| if (error == 0 || error == -EROFS) |
| return; |
| if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) |
| fs_err(sdp, "gfs2_quotad: %s error %d\n", msg, error); |
| } |
| |
| static void quotad_check_timeo(struct gfs2_sbd *sdp, const char *msg, |
| int (*fxn)(struct super_block *sb, int type), |
| unsigned long t, unsigned long *timeo, |
| unsigned int *new_timeo) |
| { |
| if (t >= *timeo) { |
| int error = fxn(sdp->sd_vfs, 0); |
| quotad_error(sdp, msg, error); |
| *timeo = gfs2_tune_get_i(&sdp->sd_tune, new_timeo) * HZ; |
| } else { |
| *timeo -= t; |
| } |
| } |
| |
| static void quotad_check_trunc_list(struct gfs2_sbd *sdp) |
| { |
| struct gfs2_inode *ip; |
| |
| while(1) { |
| ip = NULL; |
| spin_lock(&sdp->sd_trunc_lock); |
| if (!list_empty(&sdp->sd_trunc_list)) { |
| ip = list_entry(sdp->sd_trunc_list.next, |
| struct gfs2_inode, i_trunc_list); |
| list_del_init(&ip->i_trunc_list); |
| } |
| spin_unlock(&sdp->sd_trunc_lock); |
| if (ip == NULL) |
| return; |
| gfs2_glock_finish_truncate(ip); |
| } |
| } |
| |
| void gfs2_wake_up_statfs(struct gfs2_sbd *sdp) { |
| if (!sdp->sd_statfs_force_sync) { |
| sdp->sd_statfs_force_sync = 1; |
| wake_up(&sdp->sd_quota_wait); |
| } |
| } |
| |
| |
| /** |
| * gfs2_quotad - Write cached quota changes into the quota file |
| * @sdp: Pointer to GFS2 superblock |
| * |
| */ |
| |
| int gfs2_quotad(void *data) |
| { |
| struct gfs2_sbd *sdp = data; |
| struct gfs2_tune *tune = &sdp->sd_tune; |
| unsigned long statfs_timeo = 0; |
| unsigned long quotad_timeo = 0; |
| unsigned long t = 0; |
| DEFINE_WAIT(wait); |
| int empty; |
| |
| while (!kthread_should_stop()) { |
| |
| /* Update the master statfs file */ |
| if (sdp->sd_statfs_force_sync) { |
| int error = gfs2_statfs_sync(sdp->sd_vfs, 0); |
| quotad_error(sdp, "statfs", error); |
| statfs_timeo = gfs2_tune_get(sdp, gt_statfs_quantum) * HZ; |
| } |
| else |
| quotad_check_timeo(sdp, "statfs", gfs2_statfs_sync, t, |
| &statfs_timeo, |
| &tune->gt_statfs_quantum); |
| |
| /* Update quota file */ |
| quotad_check_timeo(sdp, "sync", gfs2_quota_sync, t, |
| "ad_timeo, &tune->gt_quota_quantum); |
| |
| /* Check for & recover partially truncated inodes */ |
| quotad_check_trunc_list(sdp); |
| |
| try_to_freeze(); |
| |
| t = min(quotad_timeo, statfs_timeo); |
| |
| prepare_to_wait(&sdp->sd_quota_wait, &wait, TASK_INTERRUPTIBLE); |
| spin_lock(&sdp->sd_trunc_lock); |
| empty = list_empty(&sdp->sd_trunc_list); |
| spin_unlock(&sdp->sd_trunc_lock); |
| if (empty && !sdp->sd_statfs_force_sync) |
| t -= schedule_timeout(t); |
| else |
| t = 0; |
| finish_wait(&sdp->sd_quota_wait, &wait); |
| } |
| |
| return 0; |
| } |
| |
| static int gfs2_quota_get_state(struct super_block *sb, struct qc_state *state) |
| { |
| struct gfs2_sbd *sdp = sb->s_fs_info; |
| |
| memset(state, 0, sizeof(*state)); |
| |
| switch (sdp->sd_args.ar_quota) { |
| case GFS2_QUOTA_ON: |
| state->s_state[USRQUOTA].flags |= QCI_LIMITS_ENFORCED; |
| state->s_state[GRPQUOTA].flags |= QCI_LIMITS_ENFORCED; |
| /*FALLTHRU*/ |
| case GFS2_QUOTA_ACCOUNT: |
| state->s_state[USRQUOTA].flags |= QCI_ACCT_ENABLED | |
| QCI_SYSFILE; |
| state->s_state[GRPQUOTA].flags |= QCI_ACCT_ENABLED | |
| QCI_SYSFILE; |
| break; |
| case GFS2_QUOTA_OFF: |
| break; |
| } |
| if (sdp->sd_quota_inode) { |
| state->s_state[USRQUOTA].ino = |
| GFS2_I(sdp->sd_quota_inode)->i_no_addr; |
| state->s_state[USRQUOTA].blocks = sdp->sd_quota_inode->i_blocks; |
| } |
| state->s_state[USRQUOTA].nextents = 1; /* unsupported */ |
| state->s_state[GRPQUOTA] = state->s_state[USRQUOTA]; |
| state->s_incoredqs = list_lru_count(&gfs2_qd_lru); |
| return 0; |
| } |
| |
| static int gfs2_get_dqblk(struct super_block *sb, struct kqid qid, |
| struct qc_dqblk *fdq) |
| { |
| struct gfs2_sbd *sdp = sb->s_fs_info; |
| struct gfs2_quota_lvb *qlvb; |
| struct gfs2_quota_data *qd; |
| struct gfs2_holder q_gh; |
| int error; |
| |
| memset(fdq, 0, sizeof(*fdq)); |
| |
| if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF) |
| return -ESRCH; /* Crazy XFS error code */ |
| |
| if ((qid.type != USRQUOTA) && |
| (qid.type != GRPQUOTA)) |
| return -EINVAL; |
| |
| error = qd_get(sdp, qid, &qd); |
| if (error) |
| return error; |
| error = do_glock(qd, FORCE, &q_gh); |
| if (error) |
| goto out; |
| |
| qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr; |
| fdq->d_spc_hardlimit = be64_to_cpu(qlvb->qb_limit) << sdp->sd_sb.sb_bsize_shift; |
| fdq->d_spc_softlimit = be64_to_cpu(qlvb->qb_warn) << sdp->sd_sb.sb_bsize_shift; |
| fdq->d_space = be64_to_cpu(qlvb->qb_value) << sdp->sd_sb.sb_bsize_shift; |
| |
| gfs2_glock_dq_uninit(&q_gh); |
| out: |
| qd_put(qd); |
| return error; |
| } |
| |
| /* GFS2 only supports a subset of the XFS fields */ |
| #define GFS2_FIELDMASK (QC_SPC_SOFT|QC_SPC_HARD|QC_SPACE) |
| |
| static int gfs2_set_dqblk(struct super_block *sb, struct kqid qid, |
| struct qc_dqblk *fdq) |
| { |
| struct gfs2_sbd *sdp = sb->s_fs_info; |
| struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode); |
| struct gfs2_quota_data *qd; |
| struct gfs2_holder q_gh, i_gh; |
| unsigned int data_blocks, ind_blocks; |
| unsigned int blocks = 0; |
| int alloc_required; |
| loff_t offset; |
| int error; |
| |
| if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF) |
| return -ESRCH; /* Crazy XFS error code */ |
| |
| if ((qid.type != USRQUOTA) && |
| (qid.type != GRPQUOTA)) |
| return -EINVAL; |
| |
| if (fdq->d_fieldmask & ~GFS2_FIELDMASK) |
| return -EINVAL; |
| |
| error = qd_get(sdp, qid, &qd); |
| if (error) |
| return error; |
| |
| error = gfs2_rsqa_alloc(ip); |
| if (error) |
| goto out_put; |
| |
| inode_lock(&ip->i_inode); |
| error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE, 0, &q_gh); |
| if (error) |
| goto out_unlockput; |
| error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh); |
| if (error) |
| goto out_q; |
| |
| /* Check for existing entry, if none then alloc new blocks */ |
| error = update_qd(sdp, qd); |
| if (error) |
| goto out_i; |
| |
| /* If nothing has changed, this is a no-op */ |
| if ((fdq->d_fieldmask & QC_SPC_SOFT) && |
| ((fdq->d_spc_softlimit >> sdp->sd_sb.sb_bsize_shift) == be64_to_cpu(qd->qd_qb.qb_warn))) |
| fdq->d_fieldmask ^= QC_SPC_SOFT; |
| |
| if ((fdq->d_fieldmask & QC_SPC_HARD) && |
| ((fdq->d_spc_hardlimit >> sdp->sd_sb.sb_bsize_shift) == be64_to_cpu(qd->qd_qb.qb_limit))) |
| fdq->d_fieldmask ^= QC_SPC_HARD; |
| |
| if ((fdq->d_fieldmask & QC_SPACE) && |
| ((fdq->d_space >> sdp->sd_sb.sb_bsize_shift) == be64_to_cpu(qd->qd_qb.qb_value))) |
| fdq->d_fieldmask ^= QC_SPACE; |
| |
| if (fdq->d_fieldmask == 0) |
| goto out_i; |
| |
| offset = qd2offset(qd); |
| alloc_required = gfs2_write_alloc_required(ip, offset, sizeof(struct gfs2_quota)); |
| if (gfs2_is_stuffed(ip)) |
| alloc_required = 1; |
| if (alloc_required) { |
| struct gfs2_alloc_parms ap = { .aflags = 0, }; |
| gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota), |
| &data_blocks, &ind_blocks); |
| blocks = 1 + data_blocks + ind_blocks; |
| ap.target = blocks; |
| error = gfs2_inplace_reserve(ip, &ap); |
| if (error) |
| goto out_i; |
| blocks += gfs2_rg_blocks(ip, blocks); |
| } |
| |
| /* Some quotas span block boundaries and can update two blocks, |
| adding an extra block to the transaction to handle such quotas */ |
| error = gfs2_trans_begin(sdp, blocks + RES_DINODE + 2, 0); |
| if (error) |
| goto out_release; |
| |
| /* Apply changes */ |
| error = gfs2_adjust_quota(ip, offset, 0, qd, fdq); |
| if (!error) |
| clear_bit(QDF_QMSG_QUIET, &qd->qd_flags); |
| |
| gfs2_trans_end(sdp); |
| out_release: |
| if (alloc_required) |
| gfs2_inplace_release(ip); |
| out_i: |
| gfs2_glock_dq_uninit(&i_gh); |
| out_q: |
| gfs2_glock_dq_uninit(&q_gh); |
| out_unlockput: |
| inode_unlock(&ip->i_inode); |
| out_put: |
| qd_put(qd); |
| return error; |
| } |
| |
| const struct quotactl_ops gfs2_quotactl_ops = { |
| .quota_sync = gfs2_quota_sync, |
| .get_state = gfs2_quota_get_state, |
| .get_dqblk = gfs2_get_dqblk, |
| .set_dqblk = gfs2_set_dqblk, |
| }; |
| |
| void __init gfs2_quota_hash_init(void) |
| { |
| unsigned i; |
| |
| for(i = 0; i < GFS2_QD_HASH_SIZE; i++) |
| INIT_HLIST_BL_HEAD(&qd_hash_table[i]); |
| } |