diff options
Diffstat (limited to 'fs/gfs2/super.c')
| -rw-r--r-- | fs/gfs2/super.c | 1768 |
1 files changed, 1768 insertions, 0 deletions
diff --git a/fs/gfs2/super.c b/fs/gfs2/super.c new file mode 100644 index 000000000..3cc2237e5 --- /dev/null +++ b/fs/gfs2/super.c @@ -0,0 +1,1768 @@ +/* + * 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/signal.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_loccookie, + Opt_noloccookie, + 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_loccookie, "loccookie"}, + {Opt_noloccookie, "noloccookie"}, + {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_loccookie: + args->ar_loccookie = 1; + break; + case Opt_noloccookie: + args->ar_loccookie = 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, BIT(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); + gfs2_trans_add_meta(m_ip->i_gl, m_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)); + gfs2_statfs_change_out(m_sc, m_bh->b_data + sizeof(struct gfs2_dinode)); + spin_unlock(&sdp->sd_statfs_spin); +} + +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; + bool flush_all = (wbc->sync_mode == WB_SYNC_ALL || gfs2_is_jdata(ip)); + + if (flush_all) + gfs2_log_flush(GFS2_SB(inode), ip->i_gl, + GFS2_LOG_HEAD_FLUSH_NORMAL | + GFS2_LFC_WRITE_INODE); + if (bdi->wb.dirty_exceeded) + gfs2_ail1_flush(sdp, wbc); + else + filemap_fdatawrite(metamapping); + if (flush_all) + ret = filemap_fdatawait(metamapping); + if (ret) + mark_inode_dirty_sync(inode); + else { + spin_lock(&inode->i_lock); + if (!(inode->i_flags & I_DIRTY)) + gfs2_ordered_del_inode(ip); + spin_unlock(&inode->i_lock); + } + 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_INODE)) + return; + if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) + 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; + + flush_workqueue(gfs2_delete_workqueue); + kthread_stop(sdp->sd_quotad_process); + kthread_stop(sdp->sd_logd_process); + + gfs2_quota_sync(sdp->sd_vfs, 0); + gfs2_statfs_sync(sdp->sd_vfs, 0); + + gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_SHUTDOWN | + GFS2_LFC_MAKE_FS_RO); + 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 (gfs2_holder_initialized(&freeze_gh)) + 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_rdonly(sb)) { + 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); + truncate_inode_pages_final(&sdp->sd_aspace); + gfs2_delete_debugfs_file(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) + gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_NORMAL | + GFS2_LFC_SYNC_FS); + return sdp->sd_log_error; +} + +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; + + mutex_lock(&sdp->sd_freeze_mutex); + if (atomic_read(&sdp->sd_freeze_state) != SFS_UNFROZEN) { + error = -EBUSY; + 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 || + !gfs2_holder_initialized(&sdp->sd_freeze_gh)) { + mutex_unlock(&sdp->sd_freeze_mutex); + return -EINVAL; + } + + 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 = kmalloc_array(slots, sizeof(struct gfs2_holder), GFP_KERNEL); + if (!gha) + return -ENOMEM; + for (x = 0; x < slots; x++) + gfs2_holder_mark_uninitialized(gha + x); + + rgd_next = gfs2_rgrpd_get_first(sdp); + + for (;;) { + done = 1; + + for (x = 0; x < slots; x++) { + gh = gha + x; + + if (gfs2_holder_initialized(gh) && gfs2_glock_poll(gh)) { + err = gfs2_glock_wait(gh); + if (err) { + gfs2_holder_uninit(gh); + error = err; + } else { + if (!error) { + struct gfs2_rgrpd *rgd = + gfs2_glock2rgrp(gh->gh_gl); + + error = statfs_slow_fill(rgd, sc); + } + gfs2_glock_dq_uninit(gh); + } + } + + if (gfs2_holder_initialized(gh)) + 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 = dentry->d_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 |= SB_RDONLY; + + if ((sb->s_flags ^ *flags) & SB_RDONLY) { + if (*flags & SB_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 |= SB_POSIXACL; + else + sb->s_flags &= ~SB_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 it's 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 && + gfs2_holder_initialized(&ip->i_iopen_gh)) { + struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl; + if (test_bit(GLF_DEMOTE, &gl->gl_flags)) + clear_nlink(inode); + } + + /* + * When under memory pressure when an inode's link count has dropped to + * zero, defer deleting the inode to the delete workqueue. This avoids + * calling into DLM under memory pressure, which can deadlock. + */ + if (!inode->i_nlink && + unlikely(current->flags & PF_MEMALLOC) && + gfs2_holder_initialized(&ip->i_iopen_gh)) { + struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl; + + gfs2_glock_hold(gl); + if (queue_work(gfs2_delete_workqueue, &gl->gl_delete) == 0) + gfs2_glock_queue_put(gl); + return false; + } + + 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"); + if (args->ar_loccookie) + seq_puts(s, ",loccookie"); + 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_glock_put_eventually + * @gl: The glock to put + * + * When under memory pressure, trigger a deferred glock put to make sure we + * won't call into DLM and deadlock. Otherwise, put the glock directly. + */ + +static void gfs2_glock_put_eventually(struct gfs2_glock *gl) +{ + if (current->flags & PF_MEMALLOC) + gfs2_glock_queue_put(gl); + else + gfs2_glock_put(gl); +} + +/** + * 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; + struct address_space *metamapping; + int error; + + if (test_bit(GIF_FREE_VFS_INODE, &ip->i_flags)) { + clear_inode(inode); + return; + } + + if (inode->i_nlink || sb_rdonly(sb)) + goto out; + + if (test_bit(GIF_ALLOC_FAILED, &ip->i_flags)) { + BUG_ON(!gfs2_glock_is_locked_by_me(ip->i_gl)); + gfs2_holder_mark_uninitialized(&gh); + goto alloc_failed; + } + + /* Deletes should never happen under memory pressure anymore. */ + if (WARN_ON_ONCE(current->flags & PF_MEMALLOC)) + 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)) { + glock_clear_object(ip->i_iopen_gh.gh_gl, ip); + ip->i_iopen_gh.gh_flags |= GL_NOCACHE; + 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; + + if (test_bit(GIF_INVALID, &ip->i_flags)) { + error = gfs2_inode_refresh(ip); + if (error) + goto out_truncate; + } + + /* + * The inode may have been recreated in the meantime. + */ + if (inode->i_nlink) + goto out_truncate; + +alloc_failed: + if (gfs2_holder_initialized(&ip->i_iopen_gh) && + test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags)) { + 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; + } + + /* We're about to clear the bitmap for the dinode, but as soon as we + do, gfs2_create_inode can create another inode at the same block + location and try to set gl_object again. We clear gl_object here so + that subsequent inode creates don't see an old gl_object. */ + glock_clear_object(ip->i_gl, ip); + error = gfs2_dinode_dealloc(ip); + goto out_unlock; + +out_truncate: + gfs2_log_flush(sdp, ip->i_gl, GFS2_LOG_HEAD_FLUSH_NORMAL | + GFS2_LFC_EVICT_INODE); + metamapping = gfs2_glock2aspace(ip->i_gl); + if (test_bit(GLF_DIRTY, &ip->i_gl->gl_flags)) { + 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); + truncate_inode_pages(metamapping, 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 (gfs2_holder_initialized(&ip->i_iopen_gh)) { + glock_clear_object(ip->i_iopen_gh.gh_gl, ip); + 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); + } + if (gfs2_holder_initialized(&gh)) { + glock_clear_object(ip->i_gl, ip); + 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_rsqa_delete(ip, NULL); + gfs2_ordered_del_inode(ip); + clear_inode(inode); + gfs2_dir_hash_inval(ip); + glock_clear_object(ip->i_gl, ip); + wait_on_bit_io(&ip->i_flags, GIF_GLOP_PENDING, TASK_UNINTERRUPTIBLE); + gfs2_glock_add_to_lru(ip->i_gl); + gfs2_glock_put_eventually(ip->i_gl); + ip->i_gl = NULL; + if (gfs2_holder_initialized(&ip->i_iopen_gh)) { + struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl; + + glock_clear_object(gl, ip); + ip->i_iopen_gh.gh_flags |= GL_NOCACHE; + gfs2_glock_hold(gl); + gfs2_glock_dq_uninit(&ip->i_iopen_gh); + gfs2_glock_put_eventually(gl); + } +} + +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; + memset(&ip->i_res, 0, sizeof(ip->i_res)); + RB_CLEAR_NODE(&ip->i_res.rs_node); + ip->i_rahead = 0; + } + 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, +}; + |