| /* |
| * 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. |
| */ |
| |
| #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 "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 QUOTA_USER 1 |
| #define QUOTA_GROUP 0 |
| |
| struct gfs2_quota_change_host { |
| u64 qc_change; |
| u32 qc_flags; /* GFS2_QCF_... */ |
| u32 qc_id; |
| }; |
| |
| static LIST_HEAD(qd_lru_list); |
| static atomic_t qd_lru_count = ATOMIC_INIT(0); |
| static DEFINE_SPINLOCK(qd_lru_lock); |
| |
| int gfs2_shrink_qd_memory(struct shrinker *shrink, struct shrink_control *sc) |
| { |
| struct gfs2_quota_data *qd; |
| struct gfs2_sbd *sdp; |
| int nr_to_scan = sc->nr_to_scan; |
| |
| if (nr_to_scan == 0) |
| goto out; |
| |
| if (!(sc->gfp_mask & __GFP_FS)) |
| return -1; |
| |
| spin_lock(&qd_lru_lock); |
| while (nr_to_scan && !list_empty(&qd_lru_list)) { |
| qd = list_entry(qd_lru_list.next, |
| struct gfs2_quota_data, qd_reclaim); |
| sdp = qd->qd_gl->gl_sbd; |
| |
| /* Free from the filesystem-specific list */ |
| list_del(&qd->qd_list); |
| |
| 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 */ |
| list_del_init(&qd->qd_reclaim); |
| atomic_dec(&qd_lru_count); |
| spin_unlock(&qd_lru_lock); |
| kmem_cache_free(gfs2_quotad_cachep, qd); |
| spin_lock(&qd_lru_lock); |
| nr_to_scan--; |
| } |
| spin_unlock(&qd_lru_lock); |
| |
| out: |
| return (atomic_read(&qd_lru_count) * sysctl_vfs_cache_pressure) / 100; |
| } |
| |
| static u64 qd2offset(struct gfs2_quota_data *qd) |
| { |
| u64 offset; |
| |
| offset = 2 * (u64)qd->qd_id + !test_bit(QDF_USER, &qd->qd_flags); |
| offset *= sizeof(struct gfs2_quota); |
| |
| return offset; |
| } |
| |
| static int qd_alloc(struct gfs2_sbd *sdp, int user, u32 id, |
| struct gfs2_quota_data **qdp) |
| { |
| struct gfs2_quota_data *qd; |
| int error; |
| |
| qd = kmem_cache_zalloc(gfs2_quotad_cachep, GFP_NOFS); |
| if (!qd) |
| return -ENOMEM; |
| |
| atomic_set(&qd->qd_count, 1); |
| qd->qd_id = id; |
| if (user) |
| set_bit(QDF_USER, &qd->qd_flags); |
| qd->qd_slot = -1; |
| INIT_LIST_HEAD(&qd->qd_reclaim); |
| |
| error = gfs2_glock_get(sdp, 2 * (u64)id + !user, |
| &gfs2_quota_glops, CREATE, &qd->qd_gl); |
| if (error) |
| goto fail; |
| |
| *qdp = qd; |
| |
| return 0; |
| |
| fail: |
| kmem_cache_free(gfs2_quotad_cachep, qd); |
| return error; |
| } |
| |
| static int qd_get(struct gfs2_sbd *sdp, int user, u32 id, |
| struct gfs2_quota_data **qdp) |
| { |
| struct gfs2_quota_data *qd = NULL, *new_qd = NULL; |
| int error, found; |
| |
| *qdp = NULL; |
| |
| for (;;) { |
| found = 0; |
| spin_lock(&qd_lru_lock); |
| list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) { |
| if (qd->qd_id == id && |
| !test_bit(QDF_USER, &qd->qd_flags) == !user) { |
| if (!atomic_read(&qd->qd_count) && |
| !list_empty(&qd->qd_reclaim)) { |
| /* Remove it from reclaim list */ |
| list_del_init(&qd->qd_reclaim); |
| atomic_dec(&qd_lru_count); |
| } |
| atomic_inc(&qd->qd_count); |
| found = 1; |
| break; |
| } |
| } |
| |
| if (!found) |
| qd = NULL; |
| |
| if (!qd && new_qd) { |
| qd = new_qd; |
| list_add(&qd->qd_list, &sdp->sd_quota_list); |
| atomic_inc(&sdp->sd_quota_count); |
| new_qd = NULL; |
| } |
| |
| spin_unlock(&qd_lru_lock); |
| |
| if (qd) { |
| if (new_qd) { |
| gfs2_glock_put(new_qd->qd_gl); |
| kmem_cache_free(gfs2_quotad_cachep, new_qd); |
| } |
| *qdp = qd; |
| return 0; |
| } |
| |
| error = qd_alloc(sdp, user, id, &new_qd); |
| if (error) |
| return error; |
| } |
| } |
| |
| static void qd_hold(struct gfs2_quota_data *qd) |
| { |
| struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd; |
| gfs2_assert(sdp, atomic_read(&qd->qd_count)); |
| atomic_inc(&qd->qd_count); |
| } |
| |
| static void qd_put(struct gfs2_quota_data *qd) |
| { |
| if (atomic_dec_and_lock(&qd->qd_count, &qd_lru_lock)) { |
| /* Add to the reclaim list */ |
| list_add_tail(&qd->qd_reclaim, &qd_lru_list); |
| atomic_inc(&qd_lru_count); |
| spin_unlock(&qd_lru_lock); |
| } |
| } |
| |
| static int slot_get(struct gfs2_quota_data *qd) |
| { |
| struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd; |
| unsigned int c, o = 0, b; |
| unsigned char byte = 0; |
| |
| spin_lock(&qd_lru_lock); |
| |
| if (qd->qd_slot_count++) { |
| spin_unlock(&qd_lru_lock); |
| return 0; |
| } |
| |
| for (c = 0; c < sdp->sd_quota_chunks; c++) |
| for (o = 0; o < PAGE_SIZE; o++) { |
| byte = sdp->sd_quota_bitmap[c][o]; |
| if (byte != 0xFF) |
| goto found; |
| } |
| |
| goto fail; |
| |
| found: |
| for (b = 0; b < 8; b++) |
| if (!(byte & (1 << b))) |
| break; |
| qd->qd_slot = c * (8 * PAGE_SIZE) + o * 8 + b; |
| |
| if (qd->qd_slot >= sdp->sd_quota_slots) |
| goto fail; |
| |
| sdp->sd_quota_bitmap[c][o] |= 1 << b; |
| |
| spin_unlock(&qd_lru_lock); |
| |
| return 0; |
| |
| fail: |
| qd->qd_slot_count--; |
| spin_unlock(&qd_lru_lock); |
| return -ENOSPC; |
| } |
| |
| static void slot_hold(struct gfs2_quota_data *qd) |
| { |
| struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd; |
| |
| spin_lock(&qd_lru_lock); |
| gfs2_assert(sdp, qd->qd_slot_count); |
| qd->qd_slot_count++; |
| spin_unlock(&qd_lru_lock); |
| } |
| |
| static void slot_put(struct gfs2_quota_data *qd) |
| { |
| struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd; |
| |
| spin_lock(&qd_lru_lock); |
| gfs2_assert(sdp, qd->qd_slot_count); |
| if (!--qd->qd_slot_count) { |
| gfs2_icbit_munge(sdp, sdp->sd_quota_bitmap, qd->qd_slot, 0); |
| qd->qd_slot = -1; |
| } |
| spin_unlock(&qd_lru_lock); |
| } |
| |
| static int bh_get(struct gfs2_quota_data *qd) |
| { |
| struct gfs2_sbd *sdp = qd->qd_gl->gl_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 = 1 << 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, &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_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_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_lru_lock); |
| |
| list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) { |
| if (test_bit(QDF_LOCKED, &qd->qd_flags) || |
| !test_bit(QDF_CHANGE, &qd->qd_flags) || |
| qd->qd_sync_gen >= sdp->sd_quota_sync_gen) |
| continue; |
| |
| list_move_tail(&qd->qd_list, &sdp->sd_quota_list); |
| |
| set_bit(QDF_LOCKED, &qd->qd_flags); |
| gfs2_assert_warn(sdp, atomic_read(&qd->qd_count)); |
| atomic_inc(&qd->qd_count); |
| qd->qd_change_sync = qd->qd_change; |
| gfs2_assert_warn(sdp, qd->qd_slot_count); |
| qd->qd_slot_count++; |
| found = 1; |
| |
| break; |
| } |
| |
| if (!found) |
| qd = NULL; |
| |
| spin_unlock(&qd_lru_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 int qd_trylock(struct gfs2_quota_data *qd) |
| { |
| struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd; |
| |
| if (sdp->sd_vfs->s_flags & MS_RDONLY) |
| return 0; |
| |
| spin_lock(&qd_lru_lock); |
| |
| if (test_bit(QDF_LOCKED, &qd->qd_flags) || |
| !test_bit(QDF_CHANGE, &qd->qd_flags)) { |
| spin_unlock(&qd_lru_lock); |
| return 0; |
| } |
| |
| list_move_tail(&qd->qd_list, &sdp->sd_quota_list); |
| |
| set_bit(QDF_LOCKED, &qd->qd_flags); |
| gfs2_assert_warn(sdp, atomic_read(&qd->qd_count)); |
| atomic_inc(&qd->qd_count); |
| qd->qd_change_sync = qd->qd_change; |
| gfs2_assert_warn(sdp, qd->qd_slot_count); |
| qd->qd_slot_count++; |
| |
| spin_unlock(&qd_lru_lock); |
| |
| 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); |
| return 0; |
| } |
| |
| return 1; |
| } |
| |
| static void qd_unlock(struct gfs2_quota_data *qd) |
| { |
| gfs2_assert_warn(qd->qd_gl->gl_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, int user, u32 id, |
| struct gfs2_quota_data **qdp) |
| { |
| int error; |
| |
| error = qd_get(sdp, user, id, 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); |
| } |
| |
| int gfs2_quota_hold(struct gfs2_inode *ip, u32 uid, u32 gid) |
| { |
| struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
| struct gfs2_quota_data **qd; |
| int error; |
| |
| if (ip->i_res == NULL) { |
| error = gfs2_rs_alloc(ip); |
| if (error) |
| return error; |
| } |
| |
| qd = ip->i_res->rs_qa_qd; |
| |
| if (gfs2_assert_warn(sdp, !ip->i_res->rs_qa_qd_num) || |
| gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags))) |
| return -EIO; |
| |
| if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF) |
| return 0; |
| |
| error = qdsb_get(sdp, QUOTA_USER, ip->i_inode.i_uid, qd); |
| if (error) |
| goto out; |
| ip->i_res->rs_qa_qd_num++; |
| qd++; |
| |
| error = qdsb_get(sdp, QUOTA_GROUP, ip->i_inode.i_gid, qd); |
| if (error) |
| goto out; |
| ip->i_res->rs_qa_qd_num++; |
| qd++; |
| |
| if (uid != NO_QUOTA_CHANGE && uid != ip->i_inode.i_uid) { |
| error = qdsb_get(sdp, QUOTA_USER, uid, qd); |
| if (error) |
| goto out; |
| ip->i_res->rs_qa_qd_num++; |
| qd++; |
| } |
| |
| if (gid != NO_QUOTA_CHANGE && gid != ip->i_inode.i_gid) { |
| error = qdsb_get(sdp, QUOTA_GROUP, gid, qd); |
| if (error) |
| goto out; |
| ip->i_res->rs_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); |
| unsigned int x; |
| |
| if (ip->i_res == NULL) |
| return; |
| gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags)); |
| |
| for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) { |
| qdsb_put(ip->i_res->rs_qa_qd[x]); |
| ip->i_res->rs_qa_qd[x] = NULL; |
| } |
| ip->i_res->rs_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 (!test_bit(QDF_USER, &qd_a->qd_flags) != |
| !test_bit(QDF_USER, &qd_b->qd_flags)) { |
| if (test_bit(QDF_USER, &qd_a->qd_flags)) |
| return -1; |
| else |
| return 1; |
| } |
| if (qd_a->qd_id < qd_b->qd_id) |
| return -1; |
| if (qd_a->qd_id > qd_b->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_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_bh(ip->i_gl, qd->qd_bh, 1); |
| |
| if (!test_bit(QDF_CHANGE, &qd->qd_flags)) { |
| qc->qc_change = 0; |
| qc->qc_flags = 0; |
| if (test_bit(QDF_USER, &qd->qd_flags)) |
| qc->qc_flags = cpu_to_be32(GFS2_QCF_USER); |
| qc->qc_id = cpu_to_be32(qd->qd_id); |
| } |
| |
| x = be64_to_cpu(qc->qc_change) + change; |
| qc->qc_change = cpu_to_be64(x); |
| |
| spin_lock(&qd_lru_lock); |
| qd->qd_change = x; |
| spin_unlock(&qd_lru_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); |
| } |
| |
| mutex_unlock(&sdp->sd_quota_mutex); |
| } |
| |
| /** |
| * 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 fs_disk_quota *fdq) |
| { |
| struct inode *inode = &ip->i_inode; |
| struct gfs2_sbd *sdp = GFS2_SB(inode); |
| struct address_space *mapping = inode->i_mapping; |
| unsigned long index = loc >> PAGE_CACHE_SHIFT; |
| unsigned offset = loc & (PAGE_CACHE_SIZE - 1); |
| unsigned blocksize, iblock, pos; |
| struct buffer_head *bh; |
| struct page *page; |
| void *kaddr, *ptr; |
| struct gfs2_quota q, *qp; |
| int err, nbytes; |
| 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; |
| |
| err = -EIO; |
| qp = &q; |
| qp->qu_value = be64_to_cpu(qp->qu_value); |
| qp->qu_value += change; |
| qp->qu_value = cpu_to_be64(qp->qu_value); |
| qd->qd_qb.qb_value = qp->qu_value; |
| if (fdq) { |
| if (fdq->d_fieldmask & FS_DQ_BSOFT) { |
| qp->qu_warn = cpu_to_be64(fdq->d_blk_softlimit >> sdp->sd_fsb2bb_shift); |
| qd->qd_qb.qb_warn = qp->qu_warn; |
| } |
| if (fdq->d_fieldmask & FS_DQ_BHARD) { |
| qp->qu_limit = cpu_to_be64(fdq->d_blk_hardlimit >> sdp->sd_fsb2bb_shift); |
| qd->qd_qb.qb_limit = qp->qu_limit; |
| } |
| if (fdq->d_fieldmask & FS_DQ_BCOUNT) { |
| qp->qu_value = cpu_to_be64(fdq->d_bcount >> sdp->sd_fsb2bb_shift); |
| qd->qd_qb.qb_value = qp->qu_value; |
| } |
| } |
| |
| /* Write the quota into the quota file on disk */ |
| ptr = qp; |
| nbytes = sizeof(struct gfs2_quota); |
| get_a_page: |
| page = find_or_create_page(mapping, index, GFP_NOFS); |
| if (!page) |
| return -ENOMEM; |
| |
| blocksize = inode->i_sb->s_blocksize; |
| iblock = index << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits); |
| |
| if (!page_has_buffers(page)) |
| create_empty_buffers(page, blocksize, 0); |
| |
| bh = page_buffers(page); |
| pos = blocksize; |
| while (offset >= pos) { |
| bh = bh->b_this_page; |
| iblock++; |
| pos += blocksize; |
| } |
| |
| if (!buffer_mapped(bh)) { |
| gfs2_block_map(inode, iblock, bh, 1); |
| if (!buffer_mapped(bh)) |
| goto unlock_out; |
| /* If it's a newly allocated disk block for quota, zero it */ |
| if (buffer_new(bh)) |
| zero_user(page, pos - blocksize, bh->b_size); |
| } |
| |
| if (PageUptodate(page)) |
| set_buffer_uptodate(bh); |
| |
| if (!buffer_uptodate(bh)) { |
| ll_rw_block(READ | REQ_META, 1, &bh); |
| wait_on_buffer(bh); |
| if (!buffer_uptodate(bh)) |
| goto unlock_out; |
| } |
| |
| gfs2_trans_add_bh(ip->i_gl, bh, 0); |
| |
| kaddr = kmap_atomic(page); |
| if (offset + sizeof(struct gfs2_quota) > PAGE_CACHE_SIZE) |
| nbytes = PAGE_CACHE_SIZE - offset; |
| memcpy(kaddr + offset, ptr, nbytes); |
| flush_dcache_page(page); |
| kunmap_atomic(kaddr); |
| unlock_page(page); |
| page_cache_release(page); |
| |
| /* If quota straddles page boundary, we need to update the rest of the |
| * quota at the beginning of the next page */ |
| if ((offset + sizeof(struct gfs2_quota)) > PAGE_CACHE_SIZE) { |
| ptr = ptr + nbytes; |
| nbytes = sizeof(struct gfs2_quota) - nbytes; |
| offset = 0; |
| index++; |
| goto get_a_page; |
| } |
| |
| 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); |
| return 0; |
| |
| unlock_out: |
| unlock_page(page); |
| page_cache_release(page); |
| return err; |
| } |
| |
| static int do_sync(unsigned int num_qd, struct gfs2_quota_data **qda) |
| { |
| struct gfs2_sbd *sdp = (*qda)->qd_gl->gl_sbd; |
| struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode); |
| 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_rs_alloc(ip); |
| if (error) |
| return error; |
| |
| gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota), |
| &data_blocks, &ind_blocks); |
| |
| ghs = kcalloc(num_qd, sizeof(struct gfs2_holder), GFP_NOFS); |
| if (!ghs) |
| return -ENOMEM; |
| |
| sort(qda, num_qd, sizeof(struct gfs2_quota_data *), sort_qd, NULL); |
| mutex_lock(&ip->i_inode.i_mutex); |
| 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)); |
| error = gfs2_inplace_reserve(ip, reserved, 0); |
| 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]); |
| mutex_unlock(&ip->i_inode.i_mutex); |
| kfree(ghs); |
| gfs2_log_flush(ip->i_gl->gl_sbd, ip->i_gl); |
| 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_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; |
| |
| 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, u32 uid, u32 gid) |
| { |
| struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
| struct gfs2_quota_data *qd; |
| unsigned int x; |
| int error = 0; |
| |
| error = gfs2_quota_hold(ip, uid, gid); |
| if (error) |
| return error; |
| |
| if (capable(CAP_SYS_RESOURCE) || |
| sdp->sd_args.ar_quota != GFS2_QUOTA_ON) |
| return 0; |
| |
| sort(ip->i_res->rs_qa_qd, ip->i_res->rs_qa_qd_num, |
| sizeof(struct gfs2_quota_data *), sort_qd, NULL); |
| |
| for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) { |
| int force = NO_FORCE; |
| qd = ip->i_res->rs_qa_qd[x]; |
| if (test_and_clear_bit(QDF_REFRESH, &qd->qd_flags)) |
| force = FORCE; |
| error = do_glock(qd, force, &ip->i_res->rs_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_res->rs_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_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_lru_lock); |
| value = qd->qd_change; |
| spin_unlock(&qd_lru_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_quota_data *qda[4]; |
| unsigned int count = 0; |
| unsigned int x; |
| |
| if (!test_and_clear_bit(GIF_QD_LOCKED, &ip->i_flags)) |
| goto out; |
| |
| for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) { |
| struct gfs2_quota_data *qd; |
| int sync; |
| |
| qd = ip->i_res->rs_qa_qd[x]; |
| sync = need_sync(qd); |
| |
| gfs2_glock_dq_uninit(&ip->i_res->rs_qa_qd_ghs[x]); |
| |
| if (sync && qd_trylock(qd)) |
| 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_sbd; |
| |
| printk(KERN_INFO "GFS2: fsid=%s: quota %s for %s %u\n", |
| sdp->sd_fsname, type, |
| (test_bit(QDF_USER, &qd->qd_flags)) ? "user" : "group", |
| qd->qd_id); |
| |
| return 0; |
| } |
| |
| int gfs2_quota_check(struct gfs2_inode *ip, u32 uid, u32 gid) |
| { |
| struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
| struct gfs2_quota_data *qd; |
| s64 value; |
| unsigned int x; |
| int error = 0; |
| |
| 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_res->rs_qa_qd_num; x++) { |
| qd = ip->i_res->rs_qa_qd[x]; |
| |
| if (!((qd->qd_id == uid && test_bit(QDF_USER, &qd->qd_flags)) || |
| (qd->qd_id == gid && !test_bit(QDF_USER, &qd->qd_flags)))) |
| continue; |
| |
| value = (s64)be64_to_cpu(qd->qd_qb.qb_value); |
| spin_lock(&qd_lru_lock); |
| value += qd->qd_change; |
| spin_unlock(&qd_lru_lock); |
| |
| if (be64_to_cpu(qd->qd_qb.qb_limit) && (s64)be64_to_cpu(qd->qd_qb.qb_limit) < value) { |
| print_message(qd, "exceeded"); |
| quota_send_warning(make_kqid(&init_user_ns, |
| test_bit(QDF_USER, &qd->qd_flags) ? |
| USRQUOTA : GRPQUOTA, |
| qd->qd_id), |
| sdp->sd_vfs->s_dev, QUOTA_NL_BHARDWARN); |
| |
| error = -EDQUOT; |
| break; |
| } else if (be64_to_cpu(qd->qd_qb.qb_warn) && |
| (s64)be64_to_cpu(qd->qd_qb.qb_warn) < value && |
| time_after_eq(jiffies, qd->qd_last_warn + |
| gfs2_tune_get(sdp, |
| gt_quota_warn_period) * HZ)) { |
| quota_send_warning(make_kqid(&init_user_ns, |
| test_bit(QDF_USER, &qd->qd_flags) ? |
| USRQUOTA : GRPQUOTA, |
| 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, |
| u32 uid, u32 gid) |
| { |
| struct gfs2_quota_data *qd; |
| unsigned int x; |
| |
| if (gfs2_assert_warn(GFS2_SB(&ip->i_inode), change)) |
| return; |
| if (ip->i_diskflags & GFS2_DIF_SYSTEM) |
| return; |
| |
| for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) { |
| qd = ip->i_res->rs_qa_qd[x]; |
| |
| if ((qd->qd_id == uid && test_bit(QDF_USER, &qd->qd_flags)) || |
| (qd->qd_id == gid && !test_bit(QDF_USER, &qd->qd_flags))) { |
| 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 = gfs2_tune_get(sdp, gt_quota_simul_sync); |
| unsigned int num_qd; |
| unsigned int x; |
| int error = 0; |
| |
| sdp->sd_quota_sync_gen++; |
| |
| qda = kcalloc(max_qd, sizeof(struct gfs2_quota_data *), GFP_KERNEL); |
| if (!qda) |
| return -ENOMEM; |
| |
| 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); |
| |
| kfree(qda); |
| |
| return error; |
| } |
| |
| static int gfs2_quota_sync_timeo(struct super_block *sb, int type) |
| { |
| return gfs2_quota_sync(sb, type); |
| } |
| |
| int gfs2_quota_refresh(struct gfs2_sbd *sdp, int user, u32 id) |
| { |
| struct gfs2_quota_data *qd; |
| struct gfs2_holder q_gh; |
| int error; |
| |
| error = qd_get(sdp, user, id, &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; |
| } |
| |
| static void gfs2_quota_change_in(struct gfs2_quota_change_host *qc, const void *buf) |
| { |
| const struct gfs2_quota_change *str = buf; |
| |
| qc->qc_change = be64_to_cpu(str->qc_change); |
| qc->qc_flags = be32_to_cpu(str->qc_flags); |
| qc->qc_id = be32_to_cpu(str->qc_id); |
| } |
| |
| 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; |
| 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; |
| sdp->sd_quota_chunks = DIV_ROUND_UP(sdp->sd_quota_slots, 8 * PAGE_SIZE); |
| |
| error = -ENOMEM; |
| |
| sdp->sd_quota_bitmap = kcalloc(sdp->sd_quota_chunks, |
| sizeof(unsigned char *), GFP_NOFS); |
| if (!sdp->sd_quota_bitmap) |
| return error; |
| |
| for (x = 0; x < sdp->sd_quota_chunks; x++) { |
| sdp->sd_quota_bitmap[x] = kzalloc(PAGE_SIZE, GFP_NOFS); |
| if (!sdp->sd_quota_bitmap[x]) |
| goto fail; |
| } |
| |
| for (x = 0; x < blocks; x++) { |
| struct buffer_head *bh; |
| 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; |
| } |
| |
| for (y = 0; y < sdp->sd_qc_per_block && slot < sdp->sd_quota_slots; |
| y++, slot++) { |
| struct gfs2_quota_change_host qc; |
| struct gfs2_quota_data *qd; |
| |
| gfs2_quota_change_in(&qc, bh->b_data + |
| sizeof(struct gfs2_meta_header) + |
| y * sizeof(struct gfs2_quota_change)); |
| if (!qc.qc_change) |
| continue; |
| |
| error = qd_alloc(sdp, (qc.qc_flags & GFS2_QCF_USER), |
| qc.qc_id, &qd); |
| if (error) { |
| brelse(bh); |
| goto fail; |
| } |
| |
| set_bit(QDF_CHANGE, &qd->qd_flags); |
| qd->qd_change = qc.qc_change; |
| qd->qd_slot = slot; |
| qd->qd_slot_count = 1; |
| |
| spin_lock(&qd_lru_lock); |
| gfs2_icbit_munge(sdp, sdp->sd_quota_bitmap, slot, 1); |
| list_add(&qd->qd_list, &sdp->sd_quota_list); |
| atomic_inc(&sdp->sd_quota_count); |
| spin_unlock(&qd_lru_lock); |
| |
| 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; |
| unsigned int x; |
| |
| spin_lock(&qd_lru_lock); |
| while (!list_empty(head)) { |
| qd = list_entry(head->prev, struct gfs2_quota_data, qd_list); |
| |
| if (atomic_read(&qd->qd_count) > 1 || |
| (atomic_read(&qd->qd_count) && |
| !test_bit(QDF_CHANGE, &qd->qd_flags))) { |
| list_move(&qd->qd_list, head); |
| spin_unlock(&qd_lru_lock); |
| schedule(); |
| spin_lock(&qd_lru_lock); |
| continue; |
| } |
| |
| list_del(&qd->qd_list); |
| /* Also remove if this qd exists in the reclaim list */ |
| if (!list_empty(&qd->qd_reclaim)) { |
| list_del_init(&qd->qd_reclaim); |
| atomic_dec(&qd_lru_count); |
| } |
| atomic_dec(&sdp->sd_quota_count); |
| spin_unlock(&qd_lru_lock); |
| |
| if (!atomic_read(&qd->qd_count)) { |
| gfs2_assert_warn(sdp, !qd->qd_change); |
| gfs2_assert_warn(sdp, !qd->qd_slot_count); |
| } else |
| gfs2_assert_warn(sdp, qd->qd_slot_count == 1); |
| gfs2_assert_warn(sdp, !qd->qd_bh_count); |
| |
| gfs2_glock_put(qd->qd_gl); |
| kmem_cache_free(gfs2_quotad_cachep, qd); |
| |
| spin_lock(&qd_lru_lock); |
| } |
| spin_unlock(&qd_lru_lock); |
| |
| gfs2_assert_warn(sdp, !atomic_read(&sdp->sd_quota_count)); |
| |
| if (sdp->sd_quota_bitmap) { |
| for (x = 0; x < sdp->sd_quota_chunks; x++) |
| kfree(sdp->sd_quota_bitmap[x]); |
| kfree(sdp->sd_quota_bitmap); |
| } |
| } |
| |
| 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_timeo, 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_xstate(struct super_block *sb, |
| struct fs_quota_stat *fqs) |
| { |
| struct gfs2_sbd *sdp = sb->s_fs_info; |
| |
| memset(fqs, 0, sizeof(struct fs_quota_stat)); |
| fqs->qs_version = FS_QSTAT_VERSION; |
| |
| switch (sdp->sd_args.ar_quota) { |
| case GFS2_QUOTA_ON: |
| fqs->qs_flags |= (FS_QUOTA_UDQ_ENFD | FS_QUOTA_GDQ_ENFD); |
| /*FALLTHRU*/ |
| case GFS2_QUOTA_ACCOUNT: |
| fqs->qs_flags |= (FS_QUOTA_UDQ_ACCT | FS_QUOTA_GDQ_ACCT); |
| break; |
| case GFS2_QUOTA_OFF: |
| break; |
| } |
| |
| if (sdp->sd_quota_inode) { |
| fqs->qs_uquota.qfs_ino = GFS2_I(sdp->sd_quota_inode)->i_no_addr; |
| fqs->qs_uquota.qfs_nblks = sdp->sd_quota_inode->i_blocks; |
| } |
| fqs->qs_uquota.qfs_nextents = 1; /* unsupported */ |
| fqs->qs_gquota = fqs->qs_uquota; /* its the same inode in both cases */ |
| fqs->qs_incoredqs = atomic_read(&qd_lru_count); |
| return 0; |
| } |
| |
| static int gfs2_get_dqblk(struct super_block *sb, struct kqid qid, |
| struct fs_disk_quota *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; |
| int type; |
| |
| memset(fdq, 0, sizeof(struct fs_disk_quota)); |
| |
| if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF) |
| return -ESRCH; /* Crazy XFS error code */ |
| |
| if (qid.type == USRQUOTA) |
| type = QUOTA_USER; |
| else if (qid.type == GRPQUOTA) |
| type = QUOTA_GROUP; |
| else |
| return -EINVAL; |
| |
| error = qd_get(sdp, type, from_kqid(&init_user_ns, 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_version = FS_DQUOT_VERSION; |
| fdq->d_flags = (type == QUOTA_USER) ? FS_USER_QUOTA : FS_GROUP_QUOTA; |
| fdq->d_id = from_kqid(&init_user_ns, qid); |
| fdq->d_blk_hardlimit = be64_to_cpu(qlvb->qb_limit) << sdp->sd_fsb2bb_shift; |
| fdq->d_blk_softlimit = be64_to_cpu(qlvb->qb_warn) << sdp->sd_fsb2bb_shift; |
| fdq->d_bcount = be64_to_cpu(qlvb->qb_value) << sdp->sd_fsb2bb_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 (FS_DQ_BSOFT|FS_DQ_BHARD|FS_DQ_BCOUNT) |
| |
| static int gfs2_set_dqblk(struct super_block *sb, struct kqid qid, |
| struct fs_disk_quota *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; |
| int type; |
| |
| if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF) |
| return -ESRCH; /* Crazy XFS error code */ |
| |
| switch(qid.type) { |
| case USRQUOTA: |
| type = QUOTA_USER; |
| break; |
| case GRPQUOTA: |
| type = QUOTA_GROUP; |
| break; |
| default: |
| return -EINVAL; |
| } |
| |
| if (fdq->d_fieldmask & ~GFS2_FIELDMASK) |
| return -EINVAL; |
| |
| error = qd_get(sdp, type, from_kqid(&init_user_ns, qid), &qd); |
| if (error) |
| return error; |
| |
| error = gfs2_rs_alloc(ip); |
| if (error) |
| goto out_put; |
| |
| mutex_lock(&ip->i_inode.i_mutex); |
| 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 & FS_DQ_BSOFT) && |
| ((fdq->d_blk_softlimit >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_warn))) |
| fdq->d_fieldmask ^= FS_DQ_BSOFT; |
| |
| if ((fdq->d_fieldmask & FS_DQ_BHARD) && |
| ((fdq->d_blk_hardlimit >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_limit))) |
| fdq->d_fieldmask ^= FS_DQ_BHARD; |
| |
| if ((fdq->d_fieldmask & FS_DQ_BCOUNT) && |
| ((fdq->d_bcount >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_value))) |
| fdq->d_fieldmask ^= FS_DQ_BCOUNT; |
| |
| 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) { |
| gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota), |
| &data_blocks, &ind_blocks); |
| blocks = 1 + data_blocks + ind_blocks; |
| error = gfs2_inplace_reserve(ip, blocks, 0); |
| 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); |
| |
| 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: |
| mutex_unlock(&ip->i_inode.i_mutex); |
| out_put: |
| qd_put(qd); |
| return error; |
| } |
| |
| const struct quotactl_ops gfs2_quotactl_ops = { |
| .quota_sync = gfs2_quota_sync, |
| .get_xstate = gfs2_quota_get_xstate, |
| .get_dqblk = gfs2_get_dqblk, |
| .set_dqblk = gfs2_set_dqblk, |
| }; |