/* * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. * Copyright (C) 2004-2006 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. */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include <linux/sched.h> #include <linux/spinlock.h> #include <linux/completion.h> #include <linux/buffer_head.h> #include <linux/module.h> #include <linux/kobject.h> #include <asm/uaccess.h> #include <linux/gfs2_ondisk.h> #include <linux/genhd.h> #include "gfs2.h" #include "incore.h" #include "sys.h" #include "super.h" #include "glock.h" #include "quota.h" #include "util.h" #include "glops.h" #include "recovery.h" struct gfs2_attr { struct attribute attr; ssize_t (*show)(struct gfs2_sbd *, char *); ssize_t (*store)(struct gfs2_sbd *, const char *, size_t); }; static ssize_t gfs2_attr_show(struct kobject *kobj, struct attribute *attr, char *buf) { struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj); struct gfs2_attr *a = container_of(attr, struct gfs2_attr, attr); return a->show ? a->show(sdp, buf) : 0; } static ssize_t gfs2_attr_store(struct kobject *kobj, struct attribute *attr, const char *buf, size_t len) { struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj); struct gfs2_attr *a = container_of(attr, struct gfs2_attr, attr); return a->store ? a->store(sdp, buf, len) : len; } static const struct sysfs_ops gfs2_attr_ops = { .show = gfs2_attr_show, .store = gfs2_attr_store, }; static struct kset *gfs2_kset; static ssize_t id_show(struct gfs2_sbd *sdp, char *buf) { return snprintf(buf, PAGE_SIZE, "%u:%u\n", MAJOR(sdp->sd_vfs->s_dev), MINOR(sdp->sd_vfs->s_dev)); } static ssize_t fsname_show(struct gfs2_sbd *sdp, char *buf) { return snprintf(buf, PAGE_SIZE, "%s\n", sdp->sd_fsname); } static int gfs2_uuid_valid(const u8 *uuid) { int i; for (i = 0; i < 16; i++) { if (uuid[i]) return 1; } return 0; } static ssize_t uuid_show(struct gfs2_sbd *sdp, char *buf) { struct super_block *s = sdp->sd_vfs; const u8 *uuid = s->s_uuid; buf[0] = '\0'; if (!gfs2_uuid_valid(uuid)) return 0; return snprintf(buf, PAGE_SIZE, "%pUB\n", uuid); } static ssize_t freeze_show(struct gfs2_sbd *sdp, char *buf) { struct super_block *sb = sdp->sd_vfs; int frozen = (sb->s_writers.frozen == SB_UNFROZEN) ? 0 : 1; return snprintf(buf, PAGE_SIZE, "%d\n", frozen); } static ssize_t freeze_store(struct gfs2_sbd *sdp, const char *buf, size_t len) { int error, n; error = kstrtoint(buf, 0, &n); if (error) return error; if (!capable(CAP_SYS_ADMIN)) return -EPERM; switch (n) { case 0: error = thaw_super(sdp->sd_vfs); break; case 1: error = freeze_super(sdp->sd_vfs); break; default: return -EINVAL; } if (error) { fs_warn(sdp, "freeze %d error %d", n, error); return error; } return len; } static ssize_t withdraw_show(struct gfs2_sbd *sdp, char *buf) { unsigned int b = test_bit(SDF_SHUTDOWN, &sdp->sd_flags); return snprintf(buf, PAGE_SIZE, "%u\n", b); } static ssize_t withdraw_store(struct gfs2_sbd *sdp, const char *buf, size_t len) { int error, val; if (!capable(CAP_SYS_ADMIN)) return -EPERM; error = kstrtoint(buf, 0, &val); if (error) return error; if (val != 1) return -EINVAL; gfs2_lm_withdraw(sdp, "withdrawing from cluster at user's request\n"); return len; } static ssize_t statfs_sync_store(struct gfs2_sbd *sdp, const char *buf, size_t len) { int error, val; if (!capable(CAP_SYS_ADMIN)) return -EPERM; error = kstrtoint(buf, 0, &val); if (error) return error; if (val != 1) return -EINVAL; gfs2_statfs_sync(sdp->sd_vfs, 0); return len; } static ssize_t quota_sync_store(struct gfs2_sbd *sdp, const char *buf, size_t len) { int error, val; if (!capable(CAP_SYS_ADMIN)) return -EPERM; error = kstrtoint(buf, 0, &val); if (error) return error; if (val != 1) return -EINVAL; gfs2_quota_sync(sdp->sd_vfs, 0); return len; } static ssize_t quota_refresh_user_store(struct gfs2_sbd *sdp, const char *buf, size_t len) { struct kqid qid; int error; u32 id; if (!capable(CAP_SYS_ADMIN)) return -EPERM; error = kstrtou32(buf, 0, &id); if (error) return error; qid = make_kqid(current_user_ns(), USRQUOTA, id); if (!qid_valid(qid)) return -EINVAL; error = gfs2_quota_refresh(sdp, qid); return error ? error : len; } static ssize_t quota_refresh_group_store(struct gfs2_sbd *sdp, const char *buf, size_t len) { struct kqid qid; int error; u32 id; if (!capable(CAP_SYS_ADMIN)) return -EPERM; error = kstrtou32(buf, 0, &id); if (error) return error; qid = make_kqid(current_user_ns(), GRPQUOTA, id); if (!qid_valid(qid)) return -EINVAL; error = gfs2_quota_refresh(sdp, qid); return error ? error : len; } static ssize_t demote_rq_store(struct gfs2_sbd *sdp, const char *buf, size_t len) { struct gfs2_glock *gl; const struct gfs2_glock_operations *glops; unsigned int glmode; unsigned int gltype; unsigned long long glnum; char mode[16]; int rv; if (!capable(CAP_SYS_ADMIN)) return -EPERM; rv = sscanf(buf, "%u:%llu %15s", &gltype, &glnum, mode); if (rv != 3) return -EINVAL; if (strcmp(mode, "EX") == 0) glmode = LM_ST_UNLOCKED; else if ((strcmp(mode, "CW") == 0) || (strcmp(mode, "DF") == 0)) glmode = LM_ST_DEFERRED; else if ((strcmp(mode, "PR") == 0) || (strcmp(mode, "SH") == 0)) glmode = LM_ST_SHARED; else return -EINVAL; if (gltype > LM_TYPE_JOURNAL) return -EINVAL; if (gltype == LM_TYPE_NONDISK && glnum == GFS2_FREEZE_LOCK) glops = &gfs2_freeze_glops; else glops = gfs2_glops_list[gltype]; if (glops == NULL) return -EINVAL; if (!test_and_set_bit(SDF_DEMOTE, &sdp->sd_flags)) fs_info(sdp, "demote interface used\n"); rv = gfs2_glock_get(sdp, glnum, glops, 0, &gl); if (rv) return rv; gfs2_glock_cb(gl, glmode); gfs2_glock_put(gl); return len; } #define GFS2_ATTR(name, mode, show, store) \ static struct gfs2_attr gfs2_attr_##name = __ATTR(name, mode, show, store) GFS2_ATTR(id, 0444, id_show, NULL); GFS2_ATTR(fsname, 0444, fsname_show, NULL); GFS2_ATTR(uuid, 0444, uuid_show, NULL); GFS2_ATTR(freeze, 0644, freeze_show, freeze_store); GFS2_ATTR(withdraw, 0644, withdraw_show, withdraw_store); GFS2_ATTR(statfs_sync, 0200, NULL, statfs_sync_store); GFS2_ATTR(quota_sync, 0200, NULL, quota_sync_store); GFS2_ATTR(quota_refresh_user, 0200, NULL, quota_refresh_user_store); GFS2_ATTR(quota_refresh_group, 0200, NULL, quota_refresh_group_store); GFS2_ATTR(demote_rq, 0200, NULL, demote_rq_store); static struct attribute *gfs2_attrs[] = { &gfs2_attr_id.attr, &gfs2_attr_fsname.attr, &gfs2_attr_uuid.attr, &gfs2_attr_freeze.attr, &gfs2_attr_withdraw.attr, &gfs2_attr_statfs_sync.attr, &gfs2_attr_quota_sync.attr, &gfs2_attr_quota_refresh_user.attr, &gfs2_attr_quota_refresh_group.attr, &gfs2_attr_demote_rq.attr, NULL, }; static void gfs2_sbd_release(struct kobject *kobj) { struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj); kfree(sdp); } static struct kobj_type gfs2_ktype = { .release = gfs2_sbd_release, .default_attrs = gfs2_attrs, .sysfs_ops = &gfs2_attr_ops, }; /* * lock_module. Originally from lock_dlm */ static ssize_t proto_name_show(struct gfs2_sbd *sdp, char *buf) { const struct lm_lockops *ops = sdp->sd_lockstruct.ls_ops; return sprintf(buf, "%s\n", ops->lm_proto_name); } static ssize_t block_show(struct gfs2_sbd *sdp, char *buf) { struct lm_lockstruct *ls = &sdp->sd_lockstruct; ssize_t ret; int val = 0; if (test_bit(DFL_BLOCK_LOCKS, &ls->ls_recover_flags)) val = 1; ret = sprintf(buf, "%d\n", val); return ret; } static ssize_t block_store(struct gfs2_sbd *sdp, const char *buf, size_t len) { struct lm_lockstruct *ls = &sdp->sd_lockstruct; int ret, val; ret = kstrtoint(buf, 0, &val); if (ret) return ret; if (val == 1) set_bit(DFL_BLOCK_LOCKS, &ls->ls_recover_flags); else if (val == 0) { clear_bit(DFL_BLOCK_LOCKS, &ls->ls_recover_flags); smp_mb__after_atomic(); gfs2_glock_thaw(sdp); } else { return -EINVAL; } return len; } static ssize_t wdack_show(struct gfs2_sbd *sdp, char *buf) { int val = completion_done(&sdp->sd_wdack) ? 1 : 0; return sprintf(buf, "%d\n", val); } static ssize_t wdack_store(struct gfs2_sbd *sdp, const char *buf, size_t len) { int ret, val; ret = kstrtoint(buf, 0, &val); if (ret) return ret; if ((val == 1) && !strcmp(sdp->sd_lockstruct.ls_ops->lm_proto_name, "lock_dlm")) complete(&sdp->sd_wdack); else return -EINVAL; return len; } static ssize_t lkfirst_show(struct gfs2_sbd *sdp, char *buf) { struct lm_lockstruct *ls = &sdp->sd_lockstruct; return sprintf(buf, "%d\n", ls->ls_first); } static ssize_t lkfirst_store(struct gfs2_sbd *sdp, const char *buf, size_t len) { unsigned first; int rv; rv = sscanf(buf, "%u", &first); if (rv != 1 || first > 1) return -EINVAL; rv = wait_for_completion_killable(&sdp->sd_locking_init); if (rv) return rv; spin_lock(&sdp->sd_jindex_spin); rv = -EBUSY; if (test_bit(SDF_NOJOURNALID, &sdp->sd_flags) == 0) goto out; rv = -EINVAL; if (sdp->sd_args.ar_spectator) goto out; if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL) goto out; sdp->sd_lockstruct.ls_first = first; rv = 0; out: spin_unlock(&sdp->sd_jindex_spin); return rv ? rv : len; } static ssize_t first_done_show(struct gfs2_sbd *sdp, char *buf) { struct lm_lockstruct *ls = &sdp->sd_lockstruct; return sprintf(buf, "%d\n", !!test_bit(DFL_FIRST_MOUNT_DONE, &ls->ls_recover_flags)); } int gfs2_recover_set(struct gfs2_sbd *sdp, unsigned jid) { struct gfs2_jdesc *jd; int rv; /* Wait for our primary journal to be initialized */ wait_for_completion(&sdp->sd_journal_ready); spin_lock(&sdp->sd_jindex_spin); rv = -EBUSY; if (sdp->sd_jdesc->jd_jid == jid) goto out; rv = -ENOENT; list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) { if (jd->jd_jid != jid) continue; rv = gfs2_recover_journal(jd, false); break; } out: spin_unlock(&sdp->sd_jindex_spin); return rv; } static ssize_t recover_store(struct gfs2_sbd *sdp, const char *buf, size_t len) { unsigned jid; int rv; rv = sscanf(buf, "%u", &jid); if (rv != 1) return -EINVAL; if (test_bit(SDF_NORECOVERY, &sdp->sd_flags)) { rv = -ESHUTDOWN; goto out; } rv = gfs2_recover_set(sdp, jid); out: return rv ? rv : len; } static ssize_t recover_done_show(struct gfs2_sbd *sdp, char *buf) { struct lm_lockstruct *ls = &sdp->sd_lockstruct; return sprintf(buf, "%d\n", ls->ls_recover_jid_done); } static ssize_t recover_status_show(struct gfs2_sbd *sdp, char *buf) { struct lm_lockstruct *ls = &sdp->sd_lockstruct; return sprintf(buf, "%d\n", ls->ls_recover_jid_status); } static ssize_t jid_show(struct gfs2_sbd *sdp, char *buf) { return sprintf(buf, "%d\n", sdp->sd_lockstruct.ls_jid); } static ssize_t jid_store(struct gfs2_sbd *sdp, const char *buf, size_t len) { int jid; int rv; rv = sscanf(buf, "%d", &jid); if (rv != 1) return -EINVAL; rv = wait_for_completion_killable(&sdp->sd_locking_init); if (rv) return rv; spin_lock(&sdp->sd_jindex_spin); rv = -EINVAL; if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL) goto out; rv = -EBUSY; if (test_bit(SDF_NOJOURNALID, &sdp->sd_flags) == 0) goto out; rv = 0; if (sdp->sd_args.ar_spectator && jid > 0) rv = jid = -EINVAL; sdp->sd_lockstruct.ls_jid = jid; clear_bit(SDF_NOJOURNALID, &sdp->sd_flags); smp_mb__after_atomic(); wake_up_bit(&sdp->sd_flags, SDF_NOJOURNALID); out: spin_unlock(&sdp->sd_jindex_spin); return rv ? rv : len; } #define GDLM_ATTR(_name,_mode,_show,_store) \ static struct gfs2_attr gdlm_attr_##_name = __ATTR(_name,_mode,_show,_store) GDLM_ATTR(proto_name, 0444, proto_name_show, NULL); GDLM_ATTR(block, 0644, block_show, block_store); GDLM_ATTR(withdraw, 0644, wdack_show, wdack_store); GDLM_ATTR(jid, 0644, jid_show, jid_store); GDLM_ATTR(first, 0644, lkfirst_show, lkfirst_store); GDLM_ATTR(first_done, 0444, first_done_show, NULL); GDLM_ATTR(recover, 0600, NULL, recover_store); GDLM_ATTR(recover_done, 0444, recover_done_show, NULL); GDLM_ATTR(recover_status, 0444, recover_status_show, NULL); static struct attribute *lock_module_attrs[] = { &gdlm_attr_proto_name.attr, &gdlm_attr_block.attr, &gdlm_attr_withdraw.attr, &gdlm_attr_jid.attr, &gdlm_attr_first.attr, &gdlm_attr_first_done.attr, &gdlm_attr_recover.attr, &gdlm_attr_recover_done.attr, &gdlm_attr_recover_status.attr, NULL, }; /* * get and set struct gfs2_tune fields */ static ssize_t quota_scale_show(struct gfs2_sbd *sdp, char *buf) { return snprintf(buf, PAGE_SIZE, "%u %u\n", sdp->sd_tune.gt_quota_scale_num, sdp->sd_tune.gt_quota_scale_den); } static ssize_t quota_scale_store(struct gfs2_sbd *sdp, const char *buf, size_t len) { struct gfs2_tune *gt = &sdp->sd_tune; unsigned int x, y; if (!capable(CAP_SYS_ADMIN)) return -EPERM; if (sscanf(buf, "%u %u", &x, &y) != 2 || !y) return -EINVAL; spin_lock(>->gt_spin); gt->gt_quota_scale_num = x; gt->gt_quota_scale_den = y; spin_unlock(>->gt_spin); return len; } static ssize_t tune_set(struct gfs2_sbd *sdp, unsigned int *field, int check_zero, const char *buf, size_t len) { struct gfs2_tune *gt = &sdp->sd_tune; unsigned int x; int error; if (!capable(CAP_SYS_ADMIN)) return -EPERM; error = kstrtouint(buf, 0, &x); if (error) return error; if (check_zero && !x) return -EINVAL; spin_lock(>->gt_spin); *field = x; spin_unlock(>->gt_spin); return len; } #define TUNE_ATTR_3(name, show, store) \ static struct gfs2_attr tune_attr_##name = __ATTR(name, 0644, show, store) #define TUNE_ATTR_2(name, store) \ static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf) \ { \ return snprintf(buf, PAGE_SIZE, "%u\n", sdp->sd_tune.gt_##name); \ } \ TUNE_ATTR_3(name, name##_show, store) #define TUNE_ATTR(name, check_zero) \ static ssize_t name##_store(struct gfs2_sbd *sdp, const char *buf, size_t len)\ { \ return tune_set(sdp, &sdp->sd_tune.gt_##name, check_zero, buf, len); \ } \ TUNE_ATTR_2(name, name##_store) TUNE_ATTR(quota_warn_period, 0); TUNE_ATTR(quota_quantum, 0); TUNE_ATTR(max_readahead, 0); TUNE_ATTR(complain_secs, 0); TUNE_ATTR(statfs_slow, 0); TUNE_ATTR(new_files_jdata, 0); TUNE_ATTR(statfs_quantum, 1); TUNE_ATTR_3(quota_scale, quota_scale_show, quota_scale_store); static struct attribute *tune_attrs[] = { &tune_attr_quota_warn_period.attr, &tune_attr_quota_quantum.attr, &tune_attr_max_readahead.attr, &tune_attr_complain_secs.attr, &tune_attr_statfs_slow.attr, &tune_attr_statfs_quantum.attr, &tune_attr_quota_scale.attr, &tune_attr_new_files_jdata.attr, NULL, }; static struct attribute_group tune_group = { .name = "tune", .attrs = tune_attrs, }; static struct attribute_group lock_module_group = { .name = "lock_module", .attrs = lock_module_attrs, }; int gfs2_sys_fs_add(struct gfs2_sbd *sdp) { struct super_block *sb = sdp->sd_vfs; int error; char ro[20]; char spectator[20]; char *envp[] = { ro, spectator, NULL }; int sysfs_frees_sdp = 0; sprintf(ro, "RDONLY=%d", (sb->s_flags & MS_RDONLY) ? 1 : 0); sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0); sdp->sd_kobj.kset = gfs2_kset; error = kobject_init_and_add(&sdp->sd_kobj, &gfs2_ktype, NULL, "%s", sdp->sd_table_name); if (error) goto fail_reg; sysfs_frees_sdp = 1; /* Freeing sdp is now done by sysfs calling function gfs2_sbd_release. */ error = sysfs_create_group(&sdp->sd_kobj, &tune_group); if (error) goto fail_reg; error = sysfs_create_group(&sdp->sd_kobj, &lock_module_group); if (error) goto fail_tune; error = sysfs_create_link(&sdp->sd_kobj, &disk_to_dev(sb->s_bdev->bd_disk)->kobj, "device"); if (error) goto fail_lock_module; kobject_uevent_env(&sdp->sd_kobj, KOBJ_ADD, envp); return 0; fail_lock_module: sysfs_remove_group(&sdp->sd_kobj, &lock_module_group); fail_tune: sysfs_remove_group(&sdp->sd_kobj, &tune_group); fail_reg: free_percpu(sdp->sd_lkstats); fs_err(sdp, "error %d adding sysfs files", error); if (sysfs_frees_sdp) kobject_put(&sdp->sd_kobj); else kfree(sdp); sb->s_fs_info = NULL; return error; } void gfs2_sys_fs_del(struct gfs2_sbd *sdp) { sysfs_remove_link(&sdp->sd_kobj, "device"); sysfs_remove_group(&sdp->sd_kobj, &tune_group); sysfs_remove_group(&sdp->sd_kobj, &lock_module_group); kobject_put(&sdp->sd_kobj); } static int gfs2_uevent(struct kset *kset, struct kobject *kobj, struct kobj_uevent_env *env) { struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj); struct super_block *s = sdp->sd_vfs; const u8 *uuid = s->s_uuid; add_uevent_var(env, "LOCKTABLE=%s", sdp->sd_table_name); add_uevent_var(env, "LOCKPROTO=%s", sdp->sd_proto_name); if (!test_bit(SDF_NOJOURNALID, &sdp->sd_flags)) add_uevent_var(env, "JOURNALID=%d", sdp->sd_lockstruct.ls_jid); if (gfs2_uuid_valid(uuid)) add_uevent_var(env, "UUID=%pUB", uuid); return 0; } static const struct kset_uevent_ops gfs2_uevent_ops = { .uevent = gfs2_uevent, }; int gfs2_sys_init(void) { gfs2_kset = kset_create_and_add("gfs2", &gfs2_uevent_ops, fs_kobj); if (!gfs2_kset) return -ENOMEM; return 0; } void gfs2_sys_uninit(void) { kset_unregister(gfs2_kset); }