/* * 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. */ #include <linux/bio.h> #include <linux/sched.h> #include <linux/slab.h> #include <linux/spinlock.h> #include <linux/completion.h> #include <linux/buffer_head.h> #include <linux/statfs.h> #include <linux/seq_file.h> #include <linux/mount.h> #include <linux/kthread.h> #include <linux/delay.h> #include <linux/gfs2_ondisk.h> #include <linux/crc32.h> #include <linux/time.h> #include <linux/wait.h> #include "gfs2.h" #include "incore.h" #include "bmap.h" #include "dir.h" #include "glock.h" #include "glops.h" #include "inode.h" #include "log.h" #include "meta_io.h" #include "quota.h" #include "recovery.h" #include "rgrp.h" #include "super.h" #include "trans.h" #include "util.h" #include "sys.h" #include "xattr.h" #define args_neq(a1, a2, x) ((a1)->ar_##x != (a2)->ar_##x) enum { Opt_lockproto, Opt_locktable, Opt_hostdata, Opt_spectator, Opt_ignore_local_fs, Opt_localflocks, Opt_localcaching, Opt_debug, Opt_nodebug, Opt_upgrade, Opt_acl, Opt_noacl, Opt_quota_off, Opt_quota_account, Opt_quota_on, Opt_quota, Opt_noquota, Opt_suiddir, Opt_nosuiddir, Opt_data_writeback, Opt_data_ordered, Opt_meta, Opt_discard, Opt_nodiscard, Opt_commit, Opt_err_withdraw, Opt_err_panic, Opt_statfs_quantum, Opt_statfs_percent, Opt_quota_quantum, Opt_barrier, Opt_nobarrier, Opt_error, }; static const match_table_t tokens = { {Opt_lockproto, "lockproto=%s"}, {Opt_locktable, "locktable=%s"}, {Opt_hostdata, "hostdata=%s"}, {Opt_spectator, "spectator"}, {Opt_ignore_local_fs, "ignore_local_fs"}, {Opt_localflocks, "localflocks"}, {Opt_localcaching, "localcaching"}, {Opt_debug, "debug"}, {Opt_nodebug, "nodebug"}, {Opt_upgrade, "upgrade"}, {Opt_acl, "acl"}, {Opt_noacl, "noacl"}, {Opt_quota_off, "quota=off"}, {Opt_quota_account, "quota=account"}, {Opt_quota_on, "quota=on"}, {Opt_quota, "quota"}, {Opt_noquota, "noquota"}, {Opt_suiddir, "suiddir"}, {Opt_nosuiddir, "nosuiddir"}, {Opt_data_writeback, "data=writeback"}, {Opt_data_ordered, "data=ordered"}, {Opt_meta, "meta"}, {Opt_discard, "discard"}, {Opt_nodiscard, "nodiscard"}, {Opt_commit, "commit=%d"}, {Opt_err_withdraw, "errors=withdraw"}, {Opt_err_panic, "errors=panic"}, {Opt_statfs_quantum, "statfs_quantum=%d"}, {Opt_statfs_percent, "statfs_percent=%d"}, {Opt_quota_quantum, "quota_quantum=%d"}, {Opt_barrier, "barrier"}, {Opt_nobarrier, "nobarrier"}, {Opt_error, NULL} }; /** * gfs2_mount_args - Parse mount options * @args: The structure into which the parsed options will be written * @options: The options to parse * * Return: errno */ int gfs2_mount_args(struct gfs2_args *args, char *options) { char *o; int token; substring_t tmp[MAX_OPT_ARGS]; int rv; /* Split the options into tokens with the "," character and process them */ while (1) { o = strsep(&options, ","); if (o == NULL) break; if (*o == '\0') continue; token = match_token(o, tokens, tmp); switch (token) { case Opt_lockproto: match_strlcpy(args->ar_lockproto, &tmp[0], GFS2_LOCKNAME_LEN); break; case Opt_locktable: match_strlcpy(args->ar_locktable, &tmp[0], GFS2_LOCKNAME_LEN); break; case Opt_hostdata: match_strlcpy(args->ar_hostdata, &tmp[0], GFS2_LOCKNAME_LEN); break; case Opt_spectator: args->ar_spectator = 1; break; case Opt_ignore_local_fs: args->ar_ignore_local_fs = 1; break; case Opt_localflocks: args->ar_localflocks = 1; break; case Opt_localcaching: args->ar_localcaching = 1; break; case Opt_debug: if (args->ar_errors == GFS2_ERRORS_PANIC) { printk(KERN_WARNING "GFS2: -o debug and -o errors=panic " "are mutually exclusive.\n"); return -EINVAL; } args->ar_debug = 1; break; case Opt_nodebug: args->ar_debug = 0; break; case Opt_upgrade: args->ar_upgrade = 1; break; case Opt_acl: args->ar_posix_acl = 1; break; case Opt_noacl: args->ar_posix_acl = 0; break; case Opt_quota_off: case Opt_noquota: args->ar_quota = GFS2_QUOTA_OFF; break; case Opt_quota_account: args->ar_quota = GFS2_QUOTA_ACCOUNT; break; case Opt_quota_on: case Opt_quota: args->ar_quota = GFS2_QUOTA_ON; break; case Opt_suiddir: args->ar_suiddir = 1; break; case Opt_nosuiddir: args->ar_suiddir = 0; break; case Opt_data_writeback: args->ar_data = GFS2_DATA_WRITEBACK; break; case Opt_data_ordered: args->ar_data = GFS2_DATA_ORDERED; break; case Opt_meta: args->ar_meta = 1; break; case Opt_discard: args->ar_discard = 1; break; case Opt_nodiscard: args->ar_discard = 0; break; case Opt_commit: rv = match_int(&tmp[0], &args->ar_commit); if (rv || args->ar_commit <= 0) { printk(KERN_WARNING "GFS2: commit mount option requires a positive numeric argument\n"); return rv ? rv : -EINVAL; } break; case Opt_statfs_quantum: rv = match_int(&tmp[0], &args->ar_statfs_quantum); if (rv || args->ar_statfs_quantum < 0) { printk(KERN_WARNING "GFS2: statfs_quantum mount option requires a non-negative numeric argument\n"); return rv ? rv : -EINVAL; } break; case Opt_quota_quantum: rv = match_int(&tmp[0], &args->ar_quota_quantum); if (rv || args->ar_quota_quantum <= 0) { printk(KERN_WARNING "GFS2: quota_quantum mount option requires a positive numeric argument\n"); return rv ? rv : -EINVAL; } break; case Opt_statfs_percent: rv = match_int(&tmp[0], &args->ar_statfs_percent); if (rv || args->ar_statfs_percent < 0 || args->ar_statfs_percent > 100) { printk(KERN_WARNING "statfs_percent mount option requires a numeric argument between 0 and 100\n"); return rv ? rv : -EINVAL; } break; case Opt_err_withdraw: args->ar_errors = GFS2_ERRORS_WITHDRAW; break; case Opt_err_panic: if (args->ar_debug) { printk(KERN_WARNING "GFS2: -o debug and -o errors=panic " "are mutually exclusive.\n"); return -EINVAL; } args->ar_errors = GFS2_ERRORS_PANIC; break; case Opt_barrier: args->ar_nobarrier = 0; break; case Opt_nobarrier: args->ar_nobarrier = 1; break; case Opt_error: default: printk(KERN_WARNING "GFS2: invalid mount option: %s\n", o); return -EINVAL; } } return 0; } /** * gfs2_jindex_free - Clear all the journal index information * @sdp: The GFS2 superblock * */ void gfs2_jindex_free(struct gfs2_sbd *sdp) { struct list_head list, *head; struct gfs2_jdesc *jd; struct gfs2_journal_extent *jext; spin_lock(&sdp->sd_jindex_spin); list_add(&list, &sdp->sd_jindex_list); list_del_init(&sdp->sd_jindex_list); sdp->sd_journals = 0; spin_unlock(&sdp->sd_jindex_spin); while (!list_empty(&list)) { jd = list_entry(list.next, struct gfs2_jdesc, jd_list); head = &jd->extent_list; while (!list_empty(head)) { jext = list_entry(head->next, struct gfs2_journal_extent, extent_list); list_del(&jext->extent_list); kfree(jext); } list_del(&jd->jd_list); iput(jd->jd_inode); kfree(jd); } } static struct gfs2_jdesc *jdesc_find_i(struct list_head *head, unsigned int jid) { struct gfs2_jdesc *jd; int found = 0; list_for_each_entry(jd, head, jd_list) { if (jd->jd_jid == jid) { found = 1; break; } } if (!found) jd = NULL; return jd; } struct gfs2_jdesc *gfs2_jdesc_find(struct gfs2_sbd *sdp, unsigned int jid) { struct gfs2_jdesc *jd; spin_lock(&sdp->sd_jindex_spin); jd = jdesc_find_i(&sdp->sd_jindex_list, jid); spin_unlock(&sdp->sd_jindex_spin); return jd; } int gfs2_jdesc_check(struct gfs2_jdesc *jd) { struct gfs2_inode *ip = GFS2_I(jd->jd_inode); struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode); int ar; int error; if (ip->i_disksize < (8 << 20) || ip->i_disksize > (1 << 30) || (ip->i_disksize & (sdp->sd_sb.sb_bsize - 1))) { gfs2_consist_inode(ip); return -EIO; } jd->jd_blocks = ip->i_disksize >> sdp->sd_sb.sb_bsize_shift; error = gfs2_write_alloc_required(ip, 0, ip->i_disksize, &ar); if (!error && ar) { gfs2_consist_inode(ip); error = -EIO; } return error; } /** * gfs2_make_fs_rw - Turn a Read-Only FS into a Read-Write one * @sdp: the filesystem * * Returns: errno */ int gfs2_make_fs_rw(struct gfs2_sbd *sdp) { struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode); struct gfs2_glock *j_gl = ip->i_gl; struct gfs2_holder t_gh; struct gfs2_log_header_host head; int error; error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_SHARED, 0, &t_gh); if (error) return error; j_gl->gl_ops->go_inval(j_gl, DIO_METADATA); error = gfs2_find_jhead(sdp->sd_jdesc, &head); if (error) goto fail; if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) { gfs2_consist(sdp); error = -EIO; goto fail; } /* Initialize some head of the log stuff */ sdp->sd_log_sequence = head.lh_sequence + 1; gfs2_log_pointers_init(sdp, head.lh_blkno); error = gfs2_quota_init(sdp); if (error) goto fail; set_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags); gfs2_glock_dq_uninit(&t_gh); return 0; fail: t_gh.gh_flags |= GL_NOCACHE; gfs2_glock_dq_uninit(&t_gh); return error; } void gfs2_statfs_change_in(struct gfs2_statfs_change_host *sc, const void *buf) { const struct gfs2_statfs_change *str = buf; sc->sc_total = be64_to_cpu(str->sc_total); sc->sc_free = be64_to_cpu(str->sc_free); sc->sc_dinodes = be64_to_cpu(str->sc_dinodes); } static void gfs2_statfs_change_out(const struct gfs2_statfs_change_host *sc, void *buf) { struct gfs2_statfs_change *str = buf; str->sc_total = cpu_to_be64(sc->sc_total); str->sc_free = cpu_to_be64(sc->sc_free); str->sc_dinodes = cpu_to_be64(sc->sc_dinodes); } int gfs2_statfs_init(struct gfs2_sbd *sdp) { struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master; struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode); struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; struct buffer_head *m_bh, *l_bh; struct gfs2_holder gh; int error; error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE, &gh); if (error) return error; error = gfs2_meta_inode_buffer(m_ip, &m_bh); if (error) goto out; if (sdp->sd_args.ar_spectator) { spin_lock(&sdp->sd_statfs_spin); gfs2_statfs_change_in(m_sc, m_bh->b_data + sizeof(struct gfs2_dinode)); spin_unlock(&sdp->sd_statfs_spin); } else { error = gfs2_meta_inode_buffer(l_ip, &l_bh); if (error) goto out_m_bh; spin_lock(&sdp->sd_statfs_spin); gfs2_statfs_change_in(m_sc, m_bh->b_data + sizeof(struct gfs2_dinode)); gfs2_statfs_change_in(l_sc, l_bh->b_data + sizeof(struct gfs2_dinode)); spin_unlock(&sdp->sd_statfs_spin); brelse(l_bh); } out_m_bh: brelse(m_bh); out: gfs2_glock_dq_uninit(&gh); return 0; } void gfs2_statfs_change(struct gfs2_sbd *sdp, s64 total, s64 free, s64 dinodes) { struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode); struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master; struct buffer_head *l_bh; s64 x, y; int need_sync = 0; int error; error = gfs2_meta_inode_buffer(l_ip, &l_bh); if (error) return; gfs2_trans_add_bh(l_ip->i_gl, l_bh, 1); spin_lock(&sdp->sd_statfs_spin); l_sc->sc_total += total; l_sc->sc_free += free; l_sc->sc_dinodes += dinodes; gfs2_statfs_change_out(l_sc, l_bh->b_data + sizeof(struct gfs2_dinode)); if (sdp->sd_args.ar_statfs_percent) { x = 100 * l_sc->sc_free; y = m_sc->sc_free * sdp->sd_args.ar_statfs_percent; if (x >= y || x <= -y) need_sync = 1; } spin_unlock(&sdp->sd_statfs_spin); brelse(l_bh); if (need_sync) gfs2_wake_up_statfs(sdp); } void update_statfs(struct gfs2_sbd *sdp, struct buffer_head *m_bh, struct buffer_head *l_bh) { struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode); struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master; struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; gfs2_trans_add_bh(l_ip->i_gl, l_bh, 1); spin_lock(&sdp->sd_statfs_spin); m_sc->sc_total += l_sc->sc_total; m_sc->sc_free += l_sc->sc_free; m_sc->sc_dinodes += l_sc->sc_dinodes; memset(l_sc, 0, sizeof(struct gfs2_statfs_change)); memset(l_bh->b_data + sizeof(struct gfs2_dinode), 0, sizeof(struct gfs2_statfs_change)); spin_unlock(&sdp->sd_statfs_spin); gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1); gfs2_statfs_change_out(m_sc, m_bh->b_data + sizeof(struct gfs2_dinode)); } int gfs2_statfs_sync(struct super_block *sb, int type) { struct gfs2_sbd *sdp = sb->s_fs_info; struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode); struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master; struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; struct gfs2_holder gh; struct buffer_head *m_bh, *l_bh; int error; error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE, &gh); if (error) return error; error = gfs2_meta_inode_buffer(m_ip, &m_bh); if (error) goto out; spin_lock(&sdp->sd_statfs_spin); gfs2_statfs_change_in(m_sc, m_bh->b_data + sizeof(struct gfs2_dinode)); if (!l_sc->sc_total && !l_sc->sc_free && !l_sc->sc_dinodes) { spin_unlock(&sdp->sd_statfs_spin); goto out_bh; } spin_unlock(&sdp->sd_statfs_spin); error = gfs2_meta_inode_buffer(l_ip, &l_bh); if (error) goto out_bh; error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0); if (error) goto out_bh2; update_statfs(sdp, m_bh, l_bh); sdp->sd_statfs_force_sync = 0; gfs2_trans_end(sdp); out_bh2: brelse(l_bh); out_bh: brelse(m_bh); out: gfs2_glock_dq_uninit(&gh); return error; } struct lfcc { struct list_head list; struct gfs2_holder gh; }; /** * gfs2_lock_fs_check_clean - Stop all writes to the FS and check that all * journals are clean * @sdp: the file system * @state: the state to put the transaction lock into * @t_gh: the hold on the transaction lock * * Returns: errno */ static int gfs2_lock_fs_check_clean(struct gfs2_sbd *sdp, struct gfs2_holder *t_gh) { struct gfs2_inode *ip; struct gfs2_jdesc *jd; struct lfcc *lfcc; LIST_HEAD(list); struct gfs2_log_header_host lh; int error; list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) { lfcc = kmalloc(sizeof(struct lfcc), GFP_KERNEL); if (!lfcc) { error = -ENOMEM; goto out; } ip = GFS2_I(jd->jd_inode); error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &lfcc->gh); if (error) { kfree(lfcc); goto out; } list_add(&lfcc->list, &list); } error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_DEFERRED, GL_NOCACHE, t_gh); list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) { error = gfs2_jdesc_check(jd); if (error) break; error = gfs2_find_jhead(jd, &lh); if (error) break; if (!(lh.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) { error = -EBUSY; break; } } if (error) gfs2_glock_dq_uninit(t_gh); out: while (!list_empty(&list)) { lfcc = list_entry(list.next, struct lfcc, list); list_del(&lfcc->list); gfs2_glock_dq_uninit(&lfcc->gh); kfree(lfcc); } return error; } /** * gfs2_freeze_fs - freezes the file system * @sdp: the file system * * This function flushes data and meta data for all machines by * aquiring the transaction log exclusively. All journals are * ensured to be in a clean state as well. * * Returns: errno */ int gfs2_freeze_fs(struct gfs2_sbd *sdp) { int error = 0; mutex_lock(&sdp->sd_freeze_lock); if (!sdp->sd_freeze_count++) { error = gfs2_lock_fs_check_clean(sdp, &sdp->sd_freeze_gh); if (error) sdp->sd_freeze_count--; } mutex_unlock(&sdp->sd_freeze_lock); return error; } /** * gfs2_unfreeze_fs - unfreezes the file system * @sdp: the file system * * This function allows the file system to proceed by unlocking * the exclusively held transaction lock. Other GFS2 nodes are * now free to acquire the lock shared and go on with their lives. * */ void gfs2_unfreeze_fs(struct gfs2_sbd *sdp) { mutex_lock(&sdp->sd_freeze_lock); if (sdp->sd_freeze_count && !--sdp->sd_freeze_count) gfs2_glock_dq_uninit(&sdp->sd_freeze_gh); mutex_unlock(&sdp->sd_freeze_lock); } /** * gfs2_write_inode - Make sure the inode is stable on the disk * @inode: The inode * @sync: synchronous write flag * * Returns: errno */ static int gfs2_write_inode(struct inode *inode, int sync) { struct gfs2_inode *ip = GFS2_I(inode); struct gfs2_sbd *sdp = GFS2_SB(inode); struct gfs2_holder gh; struct buffer_head *bh; struct timespec atime; struct gfs2_dinode *di; int ret = 0; /* Check this is a "normal" inode, etc */ if (!test_bit(GIF_USER, &ip->i_flags) || (current->flags & PF_MEMALLOC)) return 0; ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); if (ret) goto do_flush; ret = gfs2_trans_begin(sdp, RES_DINODE, 0); if (ret) goto do_unlock; ret = gfs2_meta_inode_buffer(ip, &bh); if (ret == 0) { di = (struct gfs2_dinode *)bh->b_data; atime.tv_sec = be64_to_cpu(di->di_atime); atime.tv_nsec = be32_to_cpu(di->di_atime_nsec); if (timespec_compare(&inode->i_atime, &atime) > 0) { gfs2_trans_add_bh(ip->i_gl, bh, 1); gfs2_dinode_out(ip, bh->b_data); } brelse(bh); } gfs2_trans_end(sdp); do_unlock: gfs2_glock_dq_uninit(&gh); do_flush: if (sync != 0) gfs2_log_flush(GFS2_SB(inode), ip->i_gl); return ret; } /** * gfs2_make_fs_ro - Turn a Read-Write FS into a Read-Only one * @sdp: the filesystem * * Returns: errno */ static int gfs2_make_fs_ro(struct gfs2_sbd *sdp) { struct gfs2_holder t_gh; int error; flush_workqueue(gfs2_delete_workqueue); gfs2_quota_sync(sdp->sd_vfs, 0); gfs2_statfs_sync(sdp->sd_vfs, 0); error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_SHARED, GL_NOCACHE, &t_gh); if (error && !test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) return error; gfs2_meta_syncfs(sdp); gfs2_log_shutdown(sdp); clear_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags); if (t_gh.gh_gl) gfs2_glock_dq_uninit(&t_gh); gfs2_quota_cleanup(sdp); return error; } static int gfs2_umount_recovery_wait(void *word) { schedule(); return 0; } /** * gfs2_put_super - Unmount the filesystem * @sb: The VFS superblock * */ static void gfs2_put_super(struct super_block *sb) { struct gfs2_sbd *sdp = sb->s_fs_info; int error; struct gfs2_jdesc *jd; /* Unfreeze the filesystem, if we need to */ mutex_lock(&sdp->sd_freeze_lock); if (sdp->sd_freeze_count) gfs2_glock_dq_uninit(&sdp->sd_freeze_gh); mutex_unlock(&sdp->sd_freeze_lock); /* No more recovery requests */ set_bit(SDF_NORECOVERY, &sdp->sd_flags); smp_mb(); /* Wait on outstanding recovery */ restart: spin_lock(&sdp->sd_jindex_spin); list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) { if (!test_bit(JDF_RECOVERY, &jd->jd_flags)) continue; spin_unlock(&sdp->sd_jindex_spin); wait_on_bit(&jd->jd_flags, JDF_RECOVERY, gfs2_umount_recovery_wait, TASK_UNINTERRUPTIBLE); goto restart; } spin_unlock(&sdp->sd_jindex_spin); kthread_stop(sdp->sd_quotad_process); kthread_stop(sdp->sd_logd_process); if (!(sb->s_flags & MS_RDONLY)) { error = gfs2_make_fs_ro(sdp); if (error) gfs2_io_error(sdp); } /* At this point, we're through modifying the disk */ /* Release stuff */ iput(sdp->sd_jindex); iput(sdp->sd_statfs_inode); iput(sdp->sd_rindex); iput(sdp->sd_quota_inode); gfs2_glock_put(sdp->sd_rename_gl); gfs2_glock_put(sdp->sd_trans_gl); if (!sdp->sd_args.ar_spectator) { gfs2_glock_dq_uninit(&sdp->sd_journal_gh); gfs2_glock_dq_uninit(&sdp->sd_jinode_gh); gfs2_glock_dq_uninit(&sdp->sd_sc_gh); gfs2_glock_dq_uninit(&sdp->sd_qc_gh); iput(sdp->sd_sc_inode); iput(sdp->sd_qc_inode); } gfs2_glock_dq_uninit(&sdp->sd_live_gh); gfs2_clear_rgrpd(sdp); gfs2_jindex_free(sdp); /* Take apart glock structures and buffer lists */ gfs2_gl_hash_clear(sdp); /* Unmount the locking protocol */ gfs2_lm_unmount(sdp); /* At this point, we're through participating in the lockspace */ gfs2_sys_fs_del(sdp); } /** * gfs2_sync_fs - sync the filesystem * @sb: the superblock * * Flushes the log to disk. */ static int gfs2_sync_fs(struct super_block *sb, int wait) { if (wait && sb->s_fs_info) gfs2_log_flush(sb->s_fs_info, NULL); return 0; } /** * gfs2_freeze - prevent further writes to the filesystem * @sb: the VFS structure for the filesystem * */ static int gfs2_freeze(struct super_block *sb) { struct gfs2_sbd *sdp = sb->s_fs_info; int error; if (test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) return -EINVAL; for (;;) { error = gfs2_freeze_fs(sdp); if (!error) break; switch (error) { case -EBUSY: fs_err(sdp, "waiting for recovery before freeze\n"); break; default: fs_err(sdp, "error freezing FS: %d\n", error); break; } fs_err(sdp, "retrying...\n"); msleep(1000); } return 0; } /** * gfs2_unfreeze - reallow writes to the filesystem * @sb: the VFS structure for the filesystem * */ static int gfs2_unfreeze(struct super_block *sb) { gfs2_unfreeze_fs(sb->s_fs_info); return 0; } /** * statfs_fill - fill in the sg for a given RG * @rgd: the RG * @sc: the sc structure * * Returns: 0 on success, -ESTALE if the LVB is invalid */ static int statfs_slow_fill(struct gfs2_rgrpd *rgd, struct gfs2_statfs_change_host *sc) { gfs2_rgrp_verify(rgd); sc->sc_total += rgd->rd_data; sc->sc_free += rgd->rd_free; sc->sc_dinodes += rgd->rd_dinodes; return 0; } /** * gfs2_statfs_slow - Stat a filesystem using asynchronous locking * @sdp: the filesystem * @sc: the sc info that will be returned * * Any error (other than a signal) will cause this routine to fall back * to the synchronous version. * * FIXME: This really shouldn't busy wait like this. * * Returns: errno */ static int gfs2_statfs_slow(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc) { struct gfs2_holder ri_gh; struct gfs2_rgrpd *rgd_next; struct gfs2_holder *gha, *gh; unsigned int slots = 64; unsigned int x; int done; int error = 0, err; memset(sc, 0, sizeof(struct gfs2_statfs_change_host)); gha = kcalloc(slots, sizeof(struct gfs2_holder), GFP_KERNEL); if (!gha) return -ENOMEM; error = gfs2_rindex_hold(sdp, &ri_gh); if (error) goto out; rgd_next = gfs2_rgrpd_get_first(sdp); for (;;) { done = 1; for (x = 0; x < slots; x++) { gh = gha + x; if (gh->gh_gl && gfs2_glock_poll(gh)) { err = gfs2_glock_wait(gh); if (err) { gfs2_holder_uninit(gh); error = err; } else { if (!error) error = statfs_slow_fill( gh->gh_gl->gl_object, sc); gfs2_glock_dq_uninit(gh); } } if (gh->gh_gl) done = 0; else if (rgd_next && !error) { error = gfs2_glock_nq_init(rgd_next->rd_gl, LM_ST_SHARED, GL_ASYNC, gh); rgd_next = gfs2_rgrpd_get_next(rgd_next); done = 0; } if (signal_pending(current)) error = -ERESTARTSYS; } if (done) break; yield(); } gfs2_glock_dq_uninit(&ri_gh); out: kfree(gha); return error; } /** * gfs2_statfs_i - Do a statfs * @sdp: the filesystem * @sg: the sg structure * * Returns: errno */ static int gfs2_statfs_i(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc) { struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master; struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; spin_lock(&sdp->sd_statfs_spin); *sc = *m_sc; sc->sc_total += l_sc->sc_total; sc->sc_free += l_sc->sc_free; sc->sc_dinodes += l_sc->sc_dinodes; spin_unlock(&sdp->sd_statfs_spin); if (sc->sc_free < 0) sc->sc_free = 0; if (sc->sc_free > sc->sc_total) sc->sc_free = sc->sc_total; if (sc->sc_dinodes < 0) sc->sc_dinodes = 0; return 0; } /** * gfs2_statfs - Gather and return stats about the filesystem * @sb: The superblock * @statfsbuf: The buffer * * Returns: 0 on success or error code */ static int gfs2_statfs(struct dentry *dentry, struct kstatfs *buf) { struct super_block *sb = dentry->d_inode->i_sb; struct gfs2_sbd *sdp = sb->s_fs_info; struct gfs2_statfs_change_host sc; int error; if (gfs2_tune_get(sdp, gt_statfs_slow)) error = gfs2_statfs_slow(sdp, &sc); else error = gfs2_statfs_i(sdp, &sc); if (error) return error; buf->f_type = GFS2_MAGIC; buf->f_bsize = sdp->sd_sb.sb_bsize; buf->f_blocks = sc.sc_total; buf->f_bfree = sc.sc_free; buf->f_bavail = sc.sc_free; buf->f_files = sc.sc_dinodes + sc.sc_free; buf->f_ffree = sc.sc_free; buf->f_namelen = GFS2_FNAMESIZE; return 0; } /** * gfs2_remount_fs - called when the FS is remounted * @sb: the filesystem * @flags: the remount flags * @data: extra data passed in (not used right now) * * Returns: errno */ static int gfs2_remount_fs(struct super_block *sb, int *flags, char *data) { struct gfs2_sbd *sdp = sb->s_fs_info; struct gfs2_args args = sdp->sd_args; /* Default to current settings */ struct gfs2_tune *gt = &sdp->sd_tune; int error; spin_lock(>->gt_spin); args.ar_commit = gt->gt_log_flush_secs; args.ar_quota_quantum = gt->gt_quota_quantum; if (gt->gt_statfs_slow) args.ar_statfs_quantum = 0; else args.ar_statfs_quantum = gt->gt_statfs_quantum; spin_unlock(>->gt_spin); error = gfs2_mount_args(&args, data); if (error) return error; /* Not allowed to change locking details */ if (strcmp(args.ar_lockproto, sdp->sd_args.ar_lockproto) || strcmp(args.ar_locktable, sdp->sd_args.ar_locktable) || strcmp(args.ar_hostdata, sdp->sd_args.ar_hostdata)) return -EINVAL; /* Some flags must not be changed */ if (args_neq(&args, &sdp->sd_args, spectator) || args_neq(&args, &sdp->sd_args, ignore_local_fs) || args_neq(&args, &sdp->sd_args, localflocks) || args_neq(&args, &sdp->sd_args, localcaching) || args_neq(&args, &sdp->sd_args, meta)) return -EINVAL; if (sdp->sd_args.ar_spectator) *flags |= MS_RDONLY; if ((sb->s_flags ^ *flags) & MS_RDONLY) { if (*flags & MS_RDONLY) error = gfs2_make_fs_ro(sdp); else error = gfs2_make_fs_rw(sdp); if (error) return error; } sdp->sd_args = args; if (sdp->sd_args.ar_posix_acl) sb->s_flags |= MS_POSIXACL; else sb->s_flags &= ~MS_POSIXACL; if (sdp->sd_args.ar_nobarrier) set_bit(SDF_NOBARRIERS, &sdp->sd_flags); else clear_bit(SDF_NOBARRIERS, &sdp->sd_flags); spin_lock(>->gt_spin); gt->gt_log_flush_secs = args.ar_commit; gt->gt_quota_quantum = args.ar_quota_quantum; if (args.ar_statfs_quantum) { gt->gt_statfs_slow = 0; gt->gt_statfs_quantum = args.ar_statfs_quantum; } else { gt->gt_statfs_slow = 1; gt->gt_statfs_quantum = 30; } spin_unlock(>->gt_spin); gfs2_online_uevent(sdp); return 0; } /** * gfs2_drop_inode - Drop an inode (test for remote unlink) * @inode: The inode to drop * * If we've received a callback on an iopen lock then its because a * remote node tried to deallocate the inode but failed due to this node * still having the inode open. Here we mark the link count zero * since we know that it must have reached zero if the GLF_DEMOTE flag * is set on the iopen glock. If we didn't do a disk read since the * remote node removed the final link then we might otherwise miss * this event. This check ensures that this node will deallocate the * inode's blocks, or alternatively pass the baton on to another * node for later deallocation. */ static void gfs2_drop_inode(struct inode *inode) { struct gfs2_inode *ip = GFS2_I(inode); if (test_bit(GIF_USER, &ip->i_flags) && inode->i_nlink) { struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl; if (gl && test_bit(GLF_DEMOTE, &gl->gl_flags)) clear_nlink(inode); } generic_drop_inode(inode); } /** * gfs2_clear_inode - Deallocate an inode when VFS is done with it * @inode: The VFS inode * */ static void gfs2_clear_inode(struct inode *inode) { struct gfs2_inode *ip = GFS2_I(inode); /* This tells us its a "real" inode and not one which only * serves to contain an address space (see rgrp.c, meta_io.c) * which therefore doesn't have its own glocks. */ if (test_bit(GIF_USER, &ip->i_flags)) { ip->i_gl->gl_object = NULL; gfs2_glock_put(ip->i_gl); ip->i_gl = NULL; if (ip->i_iopen_gh.gh_gl) { ip->i_iopen_gh.gh_gl->gl_object = NULL; gfs2_glock_dq_uninit(&ip->i_iopen_gh); } } } static int is_ancestor(const struct dentry *d1, const struct dentry *d2) { do { if (d1 == d2) return 1; d1 = d1->d_parent; } while (!IS_ROOT(d1)); return 0; } /** * gfs2_show_options - Show mount options for /proc/mounts * @s: seq_file structure * @mnt: vfsmount * * Returns: 0 on success or error code */ static int gfs2_show_options(struct seq_file *s, struct vfsmount *mnt) { struct gfs2_sbd *sdp = mnt->mnt_sb->s_fs_info; struct gfs2_args *args = &sdp->sd_args; int val; if (is_ancestor(mnt->mnt_root, sdp->sd_master_dir)) seq_printf(s, ",meta"); if (args->ar_lockproto[0]) seq_printf(s, ",lockproto=%s", args->ar_lockproto); if (args->ar_locktable[0]) seq_printf(s, ",locktable=%s", args->ar_locktable); if (args->ar_hostdata[0]) seq_printf(s, ",hostdata=%s", args->ar_hostdata); if (args->ar_spectator) seq_printf(s, ",spectator"); if (args->ar_ignore_local_fs) seq_printf(s, ",ignore_local_fs"); if (args->ar_localflocks) seq_printf(s, ",localflocks"); if (args->ar_localcaching) seq_printf(s, ",localcaching"); if (args->ar_debug) seq_printf(s, ",debug"); if (args->ar_upgrade) seq_printf(s, ",upgrade"); if (args->ar_posix_acl) seq_printf(s, ",acl"); if (args->ar_quota != GFS2_QUOTA_DEFAULT) { char *state; switch (args->ar_quota) { case GFS2_QUOTA_OFF: state = "off"; break; case GFS2_QUOTA_ACCOUNT: state = "account"; break; case GFS2_QUOTA_ON: state = "on"; break; default: state = "unknown"; break; } seq_printf(s, ",quota=%s", state); } if (args->ar_suiddir) seq_printf(s, ",suiddir"); if (args->ar_data != GFS2_DATA_DEFAULT) { char *state; switch (args->ar_data) { case GFS2_DATA_WRITEBACK: state = "writeback"; break; case GFS2_DATA_ORDERED: state = "ordered"; break; default: state = "unknown"; break; } seq_printf(s, ",data=%s", state); } if (args->ar_discard) seq_printf(s, ",discard"); val = sdp->sd_tune.gt_log_flush_secs; if (val != 60) seq_printf(s, ",commit=%d", val); val = sdp->sd_tune.gt_statfs_quantum; if (val != 30) seq_printf(s, ",statfs_quantum=%d", val); val = sdp->sd_tune.gt_quota_quantum; if (val != 60) seq_printf(s, ",quota_quantum=%d", val); if (args->ar_statfs_percent) seq_printf(s, ",statfs_percent=%d", args->ar_statfs_percent); if (args->ar_errors != GFS2_ERRORS_DEFAULT) { const char *state; switch (args->ar_errors) { case GFS2_ERRORS_WITHDRAW: state = "withdraw"; break; case GFS2_ERRORS_PANIC: state = "panic"; break; default: state = "unknown"; break; } seq_printf(s, ",errors=%s", state); } if (test_bit(SDF_NOBARRIERS, &sdp->sd_flags)) seq_printf(s, ",nobarrier"); return 0; } /* * We have to (at the moment) hold the inodes main lock to cover * the gap between unlocking the shared lock on the iopen lock and * taking the exclusive lock. I'd rather do a shared -> exclusive * conversion on the iopen lock, but we can change that later. This * is safe, just less efficient. */ static void gfs2_delete_inode(struct inode *inode) { struct gfs2_sbd *sdp = inode->i_sb->s_fs_info; struct gfs2_inode *ip = GFS2_I(inode); struct gfs2_holder gh; int error; if (!test_bit(GIF_USER, &ip->i_flags)) goto out; error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); if (unlikely(error)) { gfs2_glock_dq_uninit(&ip->i_iopen_gh); goto out; } error = gfs2_check_blk_type(sdp, ip->i_no_addr, GFS2_BLKST_UNLINKED); if (error) goto out_truncate; gfs2_glock_dq_wait(&ip->i_iopen_gh); gfs2_holder_reinit(LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB | GL_NOCACHE, &ip->i_iopen_gh); error = gfs2_glock_nq(&ip->i_iopen_gh); if (error) goto out_truncate; if (S_ISDIR(inode->i_mode) && (ip->i_diskflags & GFS2_DIF_EXHASH)) { error = gfs2_dir_exhash_dealloc(ip); if (error) goto out_unlock; } if (ip->i_eattr) { error = gfs2_ea_dealloc(ip); if (error) goto out_unlock; } if (!gfs2_is_stuffed(ip)) { error = gfs2_file_dealloc(ip); if (error) goto out_unlock; } error = gfs2_dinode_dealloc(ip); if (error) goto out_unlock; out_truncate: error = gfs2_trans_begin(sdp, 0, sdp->sd_jdesc->jd_blocks); if (error) goto out_unlock; /* Needs to be done before glock release & also in a transaction */ truncate_inode_pages(&inode->i_data, 0); gfs2_trans_end(sdp); out_unlock: if (test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags)) gfs2_glock_dq(&ip->i_iopen_gh); gfs2_holder_uninit(&ip->i_iopen_gh); gfs2_glock_dq_uninit(&gh); if (error && error != GLR_TRYFAILED && error != -EROFS) fs_warn(sdp, "gfs2_delete_inode: %d\n", error); out: truncate_inode_pages(&inode->i_data, 0); clear_inode(inode); } static struct inode *gfs2_alloc_inode(struct super_block *sb) { struct gfs2_inode *ip; ip = kmem_cache_alloc(gfs2_inode_cachep, GFP_KERNEL); if (ip) { ip->i_flags = 0; ip->i_gl = NULL; } return &ip->i_inode; } static void gfs2_destroy_inode(struct inode *inode) { kmem_cache_free(gfs2_inode_cachep, inode); } const struct super_operations gfs2_super_ops = { .alloc_inode = gfs2_alloc_inode, .destroy_inode = gfs2_destroy_inode, .write_inode = gfs2_write_inode, .delete_inode = gfs2_delete_inode, .put_super = gfs2_put_super, .sync_fs = gfs2_sync_fs, .freeze_fs = gfs2_freeze, .unfreeze_fs = gfs2_unfreeze, .statfs = gfs2_statfs, .remount_fs = gfs2_remount_fs, .clear_inode = gfs2_clear_inode, .drop_inode = gfs2_drop_inode, .show_options = gfs2_show_options, };