| /* |
| * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. |
| * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved. |
| * |
| * This copyrighted material is made available to anyone wishing to use, |
| * modify, copy, or redistribute it subject to the terms and conditions |
| * of the GNU General Public License v.2. |
| */ |
| |
| #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/vmalloc.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 "gfs2.h" |
| #include "lm_interface.h" |
| #include "incore.h" |
| #include "glock.h" |
| #include "inode.h" |
| #include "lm.h" |
| #include "log.h" |
| #include "mount.h" |
| #include "ops_super.h" |
| #include "page.h" |
| #include "quota.h" |
| #include "recovery.h" |
| #include "rgrp.h" |
| #include "super.h" |
| #include "sys.h" |
| #include "util.h" |
| #include "trans.h" |
| #include "dir.h" |
| #include "eattr.h" |
| #include "bmap.h" |
| |
| /** |
| * 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); |
| |
| /* Check this is a "normal" inode */ |
| if (inode->u.generic_ip) { |
| if (current->flags & PF_MEMALLOC) |
| return 0; |
| if (sync) |
| gfs2_log_flush(GFS2_SB(inode), ip->i_gl); |
| } |
| |
| 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; |
| |
| if (!sdp) |
| return; |
| |
| /* 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); |
| |
| kthread_stop(sdp->sd_quotad_process); |
| kthread_stop(sdp->sd_logd_process); |
| kthread_stop(sdp->sd_recoverd_process); |
| while (sdp->sd_glockd_num--) |
| kthread_stop(sdp->sd_glockd_process[sdp->sd_glockd_num]); |
| kthread_stop(sdp->sd_scand_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_master_dir); |
| iput(sdp->sd_jindex); |
| iput(sdp->sd_inum_inode); |
| 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_ir_gh); |
| gfs2_glock_dq_uninit(&sdp->sd_sc_gh); |
| gfs2_glock_dq_uninit(&sdp->sd_qc_gh); |
| iput(sdp->sd_ir_inode); |
| 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, WAIT); |
| /* Unmount the locking protocol */ |
| gfs2_lm_unmount(sdp); |
| |
| /* At this point, we're through participating in the lockspace */ |
| gfs2_sys_fs_del(sdp); |
| vfree(sdp); |
| sb->s_fs_info = NULL; |
| } |
| |
| /** |
| * gfs2_write_super - disk commit all incore transactions |
| * @sb: the filesystem |
| * |
| * This function is called every time sync(2) is called. |
| * After this exits, all dirty buffers are synced. |
| */ |
| |
| static void gfs2_write_super(struct super_block *sb) |
| { |
| struct gfs2_sbd *sdp = sb->s_fs_info; |
| gfs2_log_flush(sdp, NULL); |
| } |
| |
| /** |
| * gfs2_write_super_lockfs - prevent further writes to the filesystem |
| * @sb: the VFS structure for the filesystem |
| * |
| */ |
| |
| static void gfs2_write_super_lockfs(struct super_block *sb) |
| { |
| struct gfs2_sbd *sdp = sb->s_fs_info; |
| int error; |
| |
| 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); |
| } |
| } |
| |
| /** |
| * gfs2_unlockfs - reallow writes to the filesystem |
| * @sb: the VFS structure for the filesystem |
| * |
| */ |
| |
| static void gfs2_unlockfs(struct super_block *sb) |
| { |
| struct gfs2_sbd *sdp = sb->s_fs_info; |
| gfs2_unfreeze_fs(sdp); |
| } |
| |
| /** |
| * 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 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; |
| |
| memset(buf, 0, sizeof(struct kstatfs)); |
| |
| 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; |
| int error; |
| |
| error = gfs2_mount_args(sdp, data, 1); |
| if (error) |
| return error; |
| |
| if (sdp->sd_args.ar_spectator) |
| *flags |= MS_RDONLY; |
| else { |
| if (*flags & MS_RDONLY) { |
| if (!(sb->s_flags & MS_RDONLY)) |
| error = gfs2_make_fs_ro(sdp); |
| } else if (!(*flags & MS_RDONLY) && |
| (sb->s_flags & MS_RDONLY)) { |
| error = gfs2_make_fs_rw(sdp); |
| } |
| } |
| |
| if (*flags & (MS_NOATIME | MS_NODIRATIME)) |
| set_bit(SDF_NOATIME, &sdp->sd_flags); |
| else |
| clear_bit(SDF_NOATIME, &sdp->sd_flags); |
| |
| /* Don't let the VFS update atimes. GFS2 handles this itself. */ |
| *flags |= MS_NOATIME | MS_NODIRATIME; |
| |
| return error; |
| } |
| |
| /** |
| * gfs2_clear_inode - Deallocate an inode when VFS is done with it |
| * @inode: The VFS inode |
| * |
| */ |
| |
| static void gfs2_clear_inode(struct inode *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 (inode->u.generic_ip) { |
| struct gfs2_inode *ip = GFS2_I(inode); |
| gfs2_glock_inode_squish(inode); |
| gfs2_assert(inode->i_sb->s_fs_info, ip->i_gl->gl_state == LM_ST_UNLOCKED); |
| ip->i_gl->gl_object = NULL; |
| gfs2_glock_schedule_for_reclaim(ip->i_gl); |
| gfs2_glock_put(ip->i_gl); |
| ip->i_gl = NULL; |
| if (ip->i_iopen_gh.gh_gl) |
| gfs2_glock_dq_uninit(&ip->i_iopen_gh); |
| } |
| } |
| |
| /** |
| * 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; |
| |
| 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_num_glockd != GFS2_GLOCKD_DEFAULT) |
| seq_printf(s, ",num_glockd=%u", args->ar_num_glockd); |
| 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); |
| } |
| |
| 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 (!inode->u.generic_ip) |
| goto out; |
| |
| error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB | GL_NOCACHE, &gh); |
| if (unlikely(error)) { |
| gfs2_glock_dq_uninit(&ip->i_iopen_gh); |
| goto out; |
| } |
| |
| gfs2_glock_dq(&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_uninit; |
| |
| if (S_ISDIR(ip->i_di.di_mode) && |
| (ip->i_di.di_flags & GFS2_DIF_EXHASH)) { |
| error = gfs2_dir_exhash_dealloc(ip); |
| if (error) |
| goto out_unlock; |
| } |
| |
| if (ip->i_di.di_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); |
| |
| out_unlock: |
| gfs2_glock_dq(&ip->i_iopen_gh); |
| out_uninit: |
| gfs2_holder_uninit(&ip->i_iopen_gh); |
| gfs2_glock_dq_uninit(&gh); |
| if (error) |
| 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_sbd *sdp = sb->s_fs_info; |
| 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_greedy = gfs2_tune_get(sdp, gt_greedy_default); |
| ip->i_last_pfault = jiffies; |
| } |
| return &ip->i_inode; |
| } |
| |
| static void gfs2_destroy_inode(struct inode *inode) |
| { |
| kmem_cache_free(gfs2_inode_cachep, inode); |
| } |
| |
| 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, |
| .write_super = gfs2_write_super, |
| .write_super_lockfs = gfs2_write_super_lockfs, |
| .unlockfs = gfs2_unlockfs, |
| .statfs = gfs2_statfs, |
| .remount_fs = gfs2_remount_fs, |
| .clear_inode = gfs2_clear_inode, |
| .show_options = gfs2_show_options, |
| }; |
| |