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- /*
- * 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.
- */
- #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
- #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 <linux/writeback.h>
- #include <linux/backing-dev.h>
- #include <linux/kernel.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_rgrplvb,
- Opt_norgrplvb,
- Opt_error,
- };
- static const match_table_t tokens = {
- {Opt_lockproto, "lockproto=%s"},
- {Opt_locktable, "locktable=%s"},
- {Opt_hostdata, "hostdata=%s"},
- {Opt_spectator, "spectator"},
- {Opt_spectator, "norecovery"},
- {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_rgrplvb, "rgrplvb"},
- {Opt_norgrplvb, "norgrplvb"},
- {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:
- /* Retained for backwards compat only */
- break;
- case Opt_localflocks:
- args->ar_localflocks = 1;
- break;
- case Opt_localcaching:
- /* Retained for backwards compat only */
- break;
- case Opt_debug:
- if (args->ar_errors == GFS2_ERRORS_PANIC) {
- pr_warn("-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:
- /* Retained for backwards compat only */
- 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) {
- pr_warn("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) {
- pr_warn("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) {
- pr_warn("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) {
- pr_warn("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) {
- pr_warn("-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_rgrplvb:
- args->ar_rgrplvb = 1;
- break;
- case Opt_norgrplvb:
- args->ar_rgrplvb = 0;
- break;
- case Opt_error:
- default:
- pr_warn("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;
- struct gfs2_jdesc *jd;
- 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);
- gfs2_free_journal_extents(jd);
- 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);
- u64 size = i_size_read(jd->jd_inode);
- if (gfs2_check_internal_file_size(jd->jd_inode, 8 << 20, 1 << 30))
- return -EIO;
- jd->jd_blocks = size >> sdp->sd_sb.sb_bsize_shift;
- if (gfs2_write_alloc_required(ip, 0, size)) {
- gfs2_consist_inode(ip);
- return -EIO;
- }
- return 0;
- }
- static int init_threads(struct gfs2_sbd *sdp)
- {
- struct task_struct *p;
- int error = 0;
- p = kthread_run(gfs2_logd, sdp, "gfs2_logd");
- if (IS_ERR(p)) {
- error = PTR_ERR(p);
- fs_err(sdp, "can't start logd thread: %d\n", error);
- return error;
- }
- sdp->sd_logd_process = p;
- p = kthread_run(gfs2_quotad, sdp, "gfs2_quotad");
- if (IS_ERR(p)) {
- error = PTR_ERR(p);
- fs_err(sdp, "can't start quotad thread: %d\n", error);
- goto fail;
- }
- sdp->sd_quotad_process = p;
- return 0;
- fail:
- kthread_stop(sdp->sd_logd_process);
- 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 freeze_gh;
- struct gfs2_log_header_host head;
- int error;
- error = init_threads(sdp);
- if (error)
- return error;
- error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_SHARED, 0,
- &freeze_gh);
- if (error)
- goto fail_threads;
- 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(&freeze_gh);
- return 0;
- fail:
- freeze_gh.gh_flags |= GL_NOCACHE;
- gfs2_glock_dq_uninit(&freeze_gh);
- fail_threads:
- kthread_stop(sdp->sd_quotad_process);
- kthread_stop(sdp->sd_logd_process);
- 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_meta(l_ip->i_gl, l_bh);
- 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_meta(l_ip->i_gl, l_bh);
- 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_meta(m_ip->i_gl, m_bh);
- 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;
- sb_start_write(sb);
- error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
- &gh);
- if (error)
- goto out;
- error = gfs2_meta_inode_buffer(m_ip, &m_bh);
- if (error)
- goto out_unlock;
- 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_unlock:
- gfs2_glock_dq_uninit(&gh);
- out:
- sb_end_write(sb);
- 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 *freeze_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_freeze_gl, LM_ST_EXCLUSIVE,
- GL_NOCACHE, freeze_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(freeze_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;
- }
- void gfs2_dinode_out(const struct gfs2_inode *ip, void *buf)
- {
- struct gfs2_dinode *str = buf;
- str->di_header.mh_magic = cpu_to_be32(GFS2_MAGIC);
- str->di_header.mh_type = cpu_to_be32(GFS2_METATYPE_DI);
- str->di_header.mh_format = cpu_to_be32(GFS2_FORMAT_DI);
- str->di_num.no_addr = cpu_to_be64(ip->i_no_addr);
- str->di_num.no_formal_ino = cpu_to_be64(ip->i_no_formal_ino);
- str->di_mode = cpu_to_be32(ip->i_inode.i_mode);
- str->di_uid = cpu_to_be32(i_uid_read(&ip->i_inode));
- str->di_gid = cpu_to_be32(i_gid_read(&ip->i_inode));
- str->di_nlink = cpu_to_be32(ip->i_inode.i_nlink);
- str->di_size = cpu_to_be64(i_size_read(&ip->i_inode));
- str->di_blocks = cpu_to_be64(gfs2_get_inode_blocks(&ip->i_inode));
- str->di_atime = cpu_to_be64(ip->i_inode.i_atime.tv_sec);
- str->di_mtime = cpu_to_be64(ip->i_inode.i_mtime.tv_sec);
- str->di_ctime = cpu_to_be64(ip->i_inode.i_ctime.tv_sec);
- str->di_goal_meta = cpu_to_be64(ip->i_goal);
- str->di_goal_data = cpu_to_be64(ip->i_goal);
- str->di_generation = cpu_to_be64(ip->i_generation);
- str->di_flags = cpu_to_be32(ip->i_diskflags);
- str->di_height = cpu_to_be16(ip->i_height);
- str->di_payload_format = cpu_to_be32(S_ISDIR(ip->i_inode.i_mode) &&
- !(ip->i_diskflags & GFS2_DIF_EXHASH) ?
- GFS2_FORMAT_DE : 0);
- str->di_depth = cpu_to_be16(ip->i_depth);
- str->di_entries = cpu_to_be32(ip->i_entries);
- str->di_eattr = cpu_to_be64(ip->i_eattr);
- str->di_atime_nsec = cpu_to_be32(ip->i_inode.i_atime.tv_nsec);
- str->di_mtime_nsec = cpu_to_be32(ip->i_inode.i_mtime.tv_nsec);
- str->di_ctime_nsec = cpu_to_be32(ip->i_inode.i_ctime.tv_nsec);
- }
- /**
- * gfs2_write_inode - Make sure the inode is stable on the disk
- * @inode: The inode
- * @wbc: The writeback control structure
- *
- * Returns: errno
- */
- static int gfs2_write_inode(struct inode *inode, struct writeback_control *wbc)
- {
- struct gfs2_inode *ip = GFS2_I(inode);
- struct gfs2_sbd *sdp = GFS2_SB(inode);
- struct address_space *metamapping = gfs2_glock2aspace(ip->i_gl);
- struct backing_dev_info *bdi = inode_to_bdi(metamapping->host);
- int ret = 0;
- if (wbc->sync_mode == WB_SYNC_ALL)
- gfs2_log_flush(GFS2_SB(inode), ip->i_gl, NORMAL_FLUSH);
- if (bdi->wb.dirty_exceeded)
- gfs2_ail1_flush(sdp, wbc);
- else
- filemap_fdatawrite(metamapping);
- if (wbc->sync_mode == WB_SYNC_ALL)
- ret = filemap_fdatawait(metamapping);
- if (ret)
- mark_inode_dirty_sync(inode);
- return ret;
- }
- /**
- * gfs2_dirty_inode - check for atime updates
- * @inode: The inode in question
- * @flags: The type of dirty
- *
- * Unfortunately it can be called under any combination of inode
- * glock and transaction lock, so we have to check carefully.
- *
- * At the moment this deals only with atime - it should be possible
- * to expand that role in future, once a review of the locking has
- * been carried out.
- */
- static void gfs2_dirty_inode(struct inode *inode, int flags)
- {
- struct gfs2_inode *ip = GFS2_I(inode);
- struct gfs2_sbd *sdp = GFS2_SB(inode);
- struct buffer_head *bh;
- struct gfs2_holder gh;
- int need_unlock = 0;
- int need_endtrans = 0;
- int ret;
- if (!(flags & (I_DIRTY_DATASYNC|I_DIRTY_SYNC)))
- return;
- if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
- ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
- if (ret) {
- fs_err(sdp, "dirty_inode: glock %d\n", ret);
- return;
- }
- need_unlock = 1;
- } else if (WARN_ON_ONCE(ip->i_gl->gl_state != LM_ST_EXCLUSIVE))
- return;
- if (current->journal_info == NULL) {
- ret = gfs2_trans_begin(sdp, RES_DINODE, 0);
- if (ret) {
- fs_err(sdp, "dirty_inode: gfs2_trans_begin %d\n", ret);
- goto out;
- }
- need_endtrans = 1;
- }
- ret = gfs2_meta_inode_buffer(ip, &bh);
- if (ret == 0) {
- gfs2_trans_add_meta(ip->i_gl, bh);
- gfs2_dinode_out(ip, bh->b_data);
- brelse(bh);
- }
- if (need_endtrans)
- gfs2_trans_end(sdp);
- out:
- if (need_unlock)
- gfs2_glock_dq_uninit(&gh);
- }
- /**
- * 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 freeze_gh;
- int error;
- error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_SHARED, GL_NOCACHE,
- &freeze_gh);
- if (error && !test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
- return error;
- kthread_stop(sdp->sd_quotad_process);
- kthread_stop(sdp->sd_logd_process);
- flush_workqueue(gfs2_delete_workqueue);
- gfs2_quota_sync(sdp->sd_vfs, 0);
- gfs2_statfs_sync(sdp->sd_vfs, 0);
- down_write(&sdp->sd_log_flush_lock);
- clear_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
- up_write(&sdp->sd_log_flush_lock);
- gfs2_log_flush(sdp, NULL, SHUTDOWN_FLUSH);
- wait_event(sdp->sd_reserving_log_wait, atomic_read(&sdp->sd_reserving_log) == 0);
- gfs2_assert_warn(sdp, atomic_read(&sdp->sd_log_blks_free) == sdp->sd_jdesc->jd_blocks);
- if (freeze_gh.gh_gl)
- gfs2_glock_dq_uninit(&freeze_gh);
- gfs2_quota_cleanup(sdp);
- return error;
- }
- /**
- * 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;
- /* 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,
- TASK_UNINTERRUPTIBLE);
- goto restart;
- }
- spin_unlock(&sdp->sd_jindex_spin);
- 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_freeze_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)
- {
- struct gfs2_sbd *sdp = sb->s_fs_info;
- gfs2_quota_sync(sb, -1);
- if (wait && sdp)
- gfs2_log_flush(sdp, NULL, NORMAL_FLUSH);
- return 0;
- }
- void gfs2_freeze_func(struct work_struct *work)
- {
- int error;
- struct gfs2_holder freeze_gh;
- struct gfs2_sbd *sdp = container_of(work, struct gfs2_sbd, sd_freeze_work);
- struct super_block *sb = sdp->sd_vfs;
- atomic_inc(&sb->s_active);
- error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_SHARED, 0,
- &freeze_gh);
- if (error) {
- printk(KERN_INFO "GFS2: couln't get freeze lock : %d\n", error);
- gfs2_assert_withdraw(sdp, 0);
- }
- else {
- atomic_set(&sdp->sd_freeze_state, SFS_UNFROZEN);
- error = thaw_super(sb);
- if (error) {
- printk(KERN_INFO "GFS2: couldn't thaw filesystem: %d\n",
- error);
- gfs2_assert_withdraw(sdp, 0);
- }
- if (!test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags))
- freeze_gh.gh_flags |= GL_NOCACHE;
- gfs2_glock_dq_uninit(&freeze_gh);
- }
- deactivate_super(sb);
- return;
- }
- /**
- * 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 = 0;
- mutex_lock(&sdp->sd_freeze_mutex);
- if (atomic_read(&sdp->sd_freeze_state) != SFS_UNFROZEN)
- goto out;
- if (test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) {
- error = -EINVAL;
- goto out;
- }
- for (;;) {
- error = gfs2_lock_fs_check_clean(sdp, &sdp->sd_freeze_gh);
- 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);
- }
- error = 0;
- out:
- mutex_unlock(&sdp->sd_freeze_mutex);
- return error;
- }
- /**
- * gfs2_unfreeze - reallow writes to the filesystem
- * @sb: the VFS structure for the filesystem
- *
- */
- static int gfs2_unfreeze(struct super_block *sb)
- {
- struct gfs2_sbd *sdp = sb->s_fs_info;
- mutex_lock(&sdp->sd_freeze_mutex);
- if (atomic_read(&sdp->sd_freeze_state) != SFS_FROZEN ||
- sdp->sd_freeze_gh.gh_gl == NULL) {
- mutex_unlock(&sdp->sd_freeze_mutex);
- return 0;
- }
- gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
- mutex_unlock(&sdp->sd_freeze_mutex);
- 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_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;
- 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();
- }
- 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 = d_inode(dentry)->i_sb;
- struct gfs2_sbd *sdp = sb->s_fs_info;
- struct gfs2_statfs_change_host sc;
- int error;
- error = gfs2_rindex_update(sdp);
- if (error)
- return 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;
- sync_filesystem(sb);
- spin_lock(>->gt_spin);
- args.ar_commit = gt->gt_logd_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, localflocks) ||
- 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_logd_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 int gfs2_drop_inode(struct inode *inode)
- {
- struct gfs2_inode *ip = GFS2_I(inode);
- if (!test_bit(GIF_FREE_VFS_INODE, &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);
- }
- return generic_drop_inode(inode);
- }
- 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
- * @root: root of this (sub)tree
- *
- * Returns: 0 on success or error code
- */
- static int gfs2_show_options(struct seq_file *s, struct dentry *root)
- {
- struct gfs2_sbd *sdp = root->d_sb->s_fs_info;
- struct gfs2_args *args = &sdp->sd_args;
- int val;
- if (is_ancestor(root, sdp->sd_master_dir))
- seq_puts(s, ",meta");
- if (args->ar_lockproto[0])
- seq_show_option(s, "lockproto", args->ar_lockproto);
- if (args->ar_locktable[0])
- seq_show_option(s, "locktable", args->ar_locktable);
- if (args->ar_hostdata[0])
- seq_show_option(s, "hostdata", args->ar_hostdata);
- if (args->ar_spectator)
- seq_puts(s, ",spectator");
- if (args->ar_localflocks)
- seq_puts(s, ",localflocks");
- if (args->ar_debug)
- seq_puts(s, ",debug");
- if (args->ar_posix_acl)
- seq_puts(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_puts(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_puts(s, ",discard");
- val = sdp->sd_tune.gt_logd_secs;
- if (val != 30)
- seq_printf(s, ",commit=%d", val);
- val = sdp->sd_tune.gt_statfs_quantum;
- if (val != 30)
- seq_printf(s, ",statfs_quantum=%d", val);
- else if (sdp->sd_tune.gt_statfs_slow)
- seq_puts(s, ",statfs_quantum=0");
- 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_puts(s, ",nobarrier");
- if (test_bit(SDF_DEMOTE, &sdp->sd_flags))
- seq_puts(s, ",demote_interface_used");
- if (args->ar_rgrplvb)
- seq_puts(s, ",rgrplvb");
- return 0;
- }
- static void gfs2_final_release_pages(struct gfs2_inode *ip)
- {
- struct inode *inode = &ip->i_inode;
- struct gfs2_glock *gl = ip->i_gl;
- truncate_inode_pages(gfs2_glock2aspace(ip->i_gl), 0);
- truncate_inode_pages(&inode->i_data, 0);
- if (atomic_read(&gl->gl_revokes) == 0) {
- clear_bit(GLF_LFLUSH, &gl->gl_flags);
- clear_bit(GLF_DIRTY, &gl->gl_flags);
- }
- }
- static int gfs2_dinode_dealloc(struct gfs2_inode *ip)
- {
- struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
- struct gfs2_rgrpd *rgd;
- struct gfs2_holder gh;
- int error;
- if (gfs2_get_inode_blocks(&ip->i_inode) != 1) {
- gfs2_consist_inode(ip);
- return -EIO;
- }
- error = gfs2_rindex_update(sdp);
- if (error)
- return error;
- error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
- if (error)
- return error;
- rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
- if (!rgd) {
- gfs2_consist_inode(ip);
- error = -EIO;
- goto out_qs;
- }
- error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &gh);
- if (error)
- goto out_qs;
- error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA,
- sdp->sd_jdesc->jd_blocks);
- if (error)
- goto out_rg_gunlock;
- gfs2_free_di(rgd, ip);
- gfs2_final_release_pages(ip);
- gfs2_trans_end(sdp);
- out_rg_gunlock:
- gfs2_glock_dq_uninit(&gh);
- out_qs:
- gfs2_quota_unhold(ip);
- return error;
- }
- /**
- * gfs2_evict_inode - Remove an inode from cache
- * @inode: The inode to evict
- *
- * There are three cases to consider:
- * 1. i_nlink == 0, we are final opener (and must deallocate)
- * 2. i_nlink == 0, we are not the final opener (and cannot deallocate)
- * 3. i_nlink > 0
- *
- * If the fs is read only, then we have to treat all cases as per #3
- * since we are unable to do any deallocation. The inode will be
- * deallocated by the next read/write node to attempt an allocation
- * in the same resource group
- *
- * 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_evict_inode(struct inode *inode)
- {
- struct super_block *sb = inode->i_sb;
- struct gfs2_sbd *sdp = sb->s_fs_info;
- struct gfs2_inode *ip = GFS2_I(inode);
- struct gfs2_holder gh;
- int error;
- if (test_bit(GIF_FREE_VFS_INODE, &ip->i_flags)) {
- clear_inode(inode);
- return;
- }
- if (inode->i_nlink || (sb->s_flags & MS_RDONLY))
- goto out;
- /* Must not read inode block until block type has been verified */
- error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, &gh);
- if (unlikely(error)) {
- ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
- gfs2_glock_dq_uninit(&ip->i_iopen_gh);
- goto out;
- }
- if (!test_bit(GIF_ALLOC_FAILED, &ip->i_flags)) {
- error = gfs2_check_blk_type(sdp, ip->i_no_addr, GFS2_BLKST_UNLINKED);
- if (error)
- goto out_truncate;
- }
- if (test_bit(GIF_INVALID, &ip->i_flags)) {
- error = gfs2_inode_refresh(ip);
- if (error)
- goto out_truncate;
- }
- ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
- 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;
- /* Case 1 starts here */
- 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);
- goto out_unlock;
- out_truncate:
- gfs2_log_flush(sdp, ip->i_gl, NORMAL_FLUSH);
- if (test_bit(GLF_DIRTY, &ip->i_gl->gl_flags)) {
- struct address_space *metamapping = gfs2_glock2aspace(ip->i_gl);
- filemap_fdatawrite(metamapping);
- filemap_fdatawait(metamapping);
- }
- write_inode_now(inode, 1);
- gfs2_ail_flush(ip->i_gl, 0);
- /* Case 2 starts here */
- 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:
- /* Error path for case 1 */
- if (gfs2_rs_active(ip->i_res))
- gfs2_rs_deltree(ip->i_res);
- if (test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags)) {
- ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
- 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_evict_inode: %d\n", error);
- out:
- /* Case 3 starts here */
- truncate_inode_pages_final(&inode->i_data);
- gfs2_rs_delete(ip, NULL);
- gfs2_ordered_del_inode(ip);
- clear_inode(inode);
- gfs2_dir_hash_inval(ip);
- ip->i_gl->gl_object = NULL;
- flush_delayed_work(&ip->i_gl->gl_work);
- gfs2_glock_add_to_lru(ip->i_gl);
- 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;
- ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
- gfs2_glock_dq_uninit(&ip->i_iopen_gh);
- }
- }
- 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;
- ip->i_rgd = NULL;
- ip->i_res = NULL;
- }
- return &ip->i_inode;
- }
- static void gfs2_i_callback(struct rcu_head *head)
- {
- struct inode *inode = container_of(head, struct inode, i_rcu);
- kmem_cache_free(gfs2_inode_cachep, inode);
- }
- static void gfs2_destroy_inode(struct inode *inode)
- {
- call_rcu(&inode->i_rcu, gfs2_i_callback);
- }
- const struct super_operations gfs2_super_ops = {
- .alloc_inode = gfs2_alloc_inode,
- .destroy_inode = gfs2_destroy_inode,
- .write_inode = gfs2_write_inode,
- .dirty_inode = gfs2_dirty_inode,
- .evict_inode = gfs2_evict_inode,
- .put_super = gfs2_put_super,
- .sync_fs = gfs2_sync_fs,
- .freeze_super = gfs2_freeze,
- .thaw_super = gfs2_unfreeze,
- .statfs = gfs2_statfs,
- .remount_fs = gfs2_remount_fs,
- .drop_inode = gfs2_drop_inode,
- .show_options = gfs2_show_options,
- };
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