/* * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. * Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved. * * This copyrighted material is made available to anyone wishing to use, * modify, copy, or redistribute it subject to the terms and conditions * of the GNU General Public License version 2. */ #include <linux/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/lm_interface.h> #include <linux/time.h> #include "gfs2.h" #include "incore.h" #include "glock.h" #include "inode.h" #include "log.h" #include "mount.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" #include "meta_io.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); struct gfs2_sbd *sdp = GFS2_SB(inode); struct gfs2_holder gh; struct buffer_head *bh; struct timespec atime; struct gfs2_dinode *di; int ret = 0; /* Check this is a "normal" inode, etc */ if (!test_bit(GIF_USER, &ip->i_flags) || (current->flags & PF_MEMALLOC)) return 0; ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); if (ret) goto do_flush; ret = gfs2_trans_begin(sdp, RES_DINODE, 0); if (ret) goto do_unlock; ret = gfs2_meta_inode_buffer(ip, &bh); if (ret == 0) { di = (struct gfs2_dinode *)bh->b_data; atime.tv_sec = be64_to_cpu(di->di_atime); atime.tv_nsec = be32_to_cpu(di->di_atime_nsec); if (timespec_compare(&inode->i_atime, &atime) > 0) { gfs2_trans_add_bh(ip->i_gl, bh, 1); gfs2_dinode_out(ip, bh->b_data); } brelse(bh); } gfs2_trans_end(sdp); do_unlock: gfs2_glock_dq_uninit(&gh); do_flush: if (sync != 0) gfs2_log_flush(GFS2_SB(inode), ip->i_gl); return ret; } /** * gfs2_make_fs_ro - Turn a Read-Write FS into a Read-Only one * @sdp: the filesystem * * Returns: errno */ static int gfs2_make_fs_ro(struct gfs2_sbd *sdp) { struct gfs2_holder t_gh; int error; gfs2_quota_sync(sdp); gfs2_statfs_sync(sdp); error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_SHARED, GL_NOCACHE, &t_gh); if (error && !test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) return error; gfs2_meta_syncfs(sdp); gfs2_log_shutdown(sdp); clear_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags); if (t_gh.gh_gl) gfs2_glock_dq_uninit(&t_gh); gfs2_quota_cleanup(sdp); return error; } /** * 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; /* 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); 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_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); /* Unmount the locking protocol */ gfs2_lm_unmount(sdp); /* At this point, we're through participating in the lockspace */ gfs2_sys_fs_del(sdp); } /** * gfs2_write_super * @sb: the superblock * */ static void gfs2_write_super(struct super_block *sb) { sb->s_dirt = 0; } /** * 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) { sb->s_dirt = 0; if (wait && sb->s_fs_info) gfs2_log_flush(sb->s_fs_info, NULL); return 0; } /** * gfs2_freeze - prevent further writes to the filesystem * @sb: the VFS structure for the filesystem * */ static int gfs2_freeze(struct super_block *sb) { struct gfs2_sbd *sdp = sb->s_fs_info; int error; if (test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) return -EINVAL; for (;;) { error = gfs2_freeze_fs(sdp); if (!error) break; switch (error) { case -EBUSY: fs_err(sdp, "waiting for recovery before freeze\n"); break; default: fs_err(sdp, "error freezing FS: %d\n", error); break; } fs_err(sdp, "retrying...\n"); msleep(1000); } return 0; } /** * gfs2_unfreeze - reallow writes to the filesystem * @sb: the VFS structure for the filesystem * */ static int gfs2_unfreeze(struct super_block *sb) { gfs2_unfreeze_fs(sb->s_fs_info); return 0; } /** * statfs_fill - fill in the sg for a given RG * @rgd: the RG * @sc: the sc structure * * Returns: 0 on success, -ESTALE if the LVB is invalid */ static int statfs_slow_fill(struct gfs2_rgrpd *rgd, struct gfs2_statfs_change_host *sc) { gfs2_rgrp_verify(rgd); sc->sc_total += rgd->rd_data; sc->sc_free += rgd->rd_free; sc->sc_dinodes += rgd->rd_dinodes; return 0; } /** * gfs2_statfs_slow - Stat a filesystem using asynchronous locking * @sdp: the filesystem * @sc: the sc info that will be returned * * Any error (other than a signal) will cause this routine to fall back * to the synchronous version. * * FIXME: This really shouldn't busy wait like this. * * Returns: errno */ static int gfs2_statfs_slow(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc) { struct gfs2_holder ri_gh; struct gfs2_rgrpd *rgd_next; struct gfs2_holder *gha, *gh; unsigned int slots = 64; unsigned int x; int done; int error = 0, err; memset(sc, 0, sizeof(struct gfs2_statfs_change_host)); gha = kcalloc(slots, sizeof(struct gfs2_holder), GFP_KERNEL); if (!gha) return -ENOMEM; error = gfs2_rindex_hold(sdp, &ri_gh); if (error) goto out; rgd_next = gfs2_rgrpd_get_first(sdp); for (;;) { done = 1; for (x = 0; x < slots; x++) { gh = gha + x; if (gh->gh_gl && gfs2_glock_poll(gh)) { err = gfs2_glock_wait(gh); if (err) { gfs2_holder_uninit(gh); error = err; } else { if (!error) error = statfs_slow_fill( gh->gh_gl->gl_object, sc); gfs2_glock_dq_uninit(gh); } } if (gh->gh_gl) done = 0; else if (rgd_next && !error) { error = gfs2_glock_nq_init(rgd_next->rd_gl, LM_ST_SHARED, GL_ASYNC, gh); rgd_next = gfs2_rgrpd_get_next(rgd_next); done = 0; } if (signal_pending(current)) error = -ERESTARTSYS; } if (done) break; yield(); } gfs2_glock_dq_uninit(&ri_gh); out: kfree(gha); return error; } /** * gfs2_statfs_i - Do a statfs * @sdp: the filesystem * @sg: the sg structure * * Returns: errno */ static int gfs2_statfs_i(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc) { struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master; struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; spin_lock(&sdp->sd_statfs_spin); *sc = *m_sc; sc->sc_total += l_sc->sc_total; sc->sc_free += l_sc->sc_free; sc->sc_dinodes += l_sc->sc_dinodes; spin_unlock(&sdp->sd_statfs_spin); if (sc->sc_free < 0) sc->sc_free = 0; if (sc->sc_free > sc->sc_total) sc->sc_free = sc->sc_total; if (sc->sc_dinodes < 0) sc->sc_dinodes = 0; return 0; } /** * gfs2_statfs - Gather and return stats about the filesystem * @sb: The superblock * @statfsbuf: The buffer * * Returns: 0 on success or error code */ static int gfs2_statfs(struct dentry *dentry, struct kstatfs *buf) { struct super_block *sb = dentry->d_inode->i_sb; struct gfs2_sbd *sdp = sb->s_fs_info; struct gfs2_statfs_change_host sc; int error; if (gfs2_tune_get(sdp, gt_statfs_slow)) error = gfs2_statfs_slow(sdp, &sc); else error = gfs2_statfs_i(sdp, &sc); if (error) return error; buf->f_type = GFS2_MAGIC; buf->f_bsize = sdp->sd_sb.sb_bsize; buf->f_blocks = sc.sc_total; buf->f_bfree = sc.sc_free; buf->f_bavail = sc.sc_free; buf->f_files = sc.sc_dinodes + sc.sc_free; buf->f_ffree = sc.sc_free; buf->f_namelen = GFS2_FNAMESIZE; return 0; } /** * gfs2_remount_fs - called when the FS is remounted * @sb: the filesystem * @flags: the remount flags * @data: extra data passed in (not used right now) * * Returns: errno */ static int gfs2_remount_fs(struct super_block *sb, int *flags, char *data) { struct gfs2_sbd *sdp = sb->s_fs_info; 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); } } return error; } /** * gfs2_drop_inode - Drop an inode (test for remote unlink) * @inode: The inode to drop * * If we've received a callback on an iopen lock then its because a * remote node tried to deallocate the inode but failed due to this node * still having the inode open. Here we mark the link count zero * since we know that it must have reached zero if the GLF_DEMOTE flag * is set on the iopen glock. If we didn't do a disk read since the * remote node removed the final link then we might otherwise miss * this event. This check ensures that this node will deallocate the * inode's blocks, or alternatively pass the baton on to another * node for later deallocation. */ static void gfs2_drop_inode(struct inode *inode) { struct gfs2_inode *ip = GFS2_I(inode); if (test_bit(GIF_USER, &ip->i_flags) && inode->i_nlink) { struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl; if (gl && test_bit(GLF_DEMOTE, &gl->gl_flags)) clear_nlink(inode); } generic_drop_inode(inode); } /** * gfs2_clear_inode - Deallocate an inode when VFS is done with it * @inode: The VFS inode * */ static void gfs2_clear_inode(struct inode *inode) { struct gfs2_inode *ip = GFS2_I(inode); /* This tells us its a "real" inode and not one which only * serves to contain an address space (see rgrp.c, meta_io.c) * which therefore doesn't have its own glocks. */ if (test_bit(GIF_USER, &ip->i_flags)) { ip->i_gl->gl_object = NULL; gfs2_glock_put(ip->i_gl); ip->i_gl = NULL; if (ip->i_iopen_gh.gh_gl) { ip->i_iopen_gh.gh_gl->gl_object = NULL; gfs2_glock_dq_uninit(&ip->i_iopen_gh); } } } static int is_ancestor(const struct dentry *d1, const struct dentry *d2) { do { if (d1 == d2) return 1; d1 = d1->d_parent; } while (!IS_ROOT(d1)); return 0; } /** * gfs2_show_options - Show mount options for /proc/mounts * @s: seq_file structure * @mnt: vfsmount * * Returns: 0 on success or error code */ static int gfs2_show_options(struct seq_file *s, struct vfsmount *mnt) { struct gfs2_sbd *sdp = mnt->mnt_sb->s_fs_info; struct gfs2_args *args = &sdp->sd_args; if (is_ancestor(mnt->mnt_root, sdp->sd_master_dir)) seq_printf(s, ",meta"); if (args->ar_lockproto[0]) seq_printf(s, ",lockproto=%s", args->ar_lockproto); if (args->ar_locktable[0]) seq_printf(s, ",locktable=%s", args->ar_locktable); if (args->ar_hostdata[0]) seq_printf(s, ",hostdata=%s", args->ar_hostdata); if (args->ar_spectator) seq_printf(s, ",spectator"); if (args->ar_ignore_local_fs) seq_printf(s, ",ignore_local_fs"); if (args->ar_localflocks) seq_printf(s, ",localflocks"); if (args->ar_localcaching) seq_printf(s, ",localcaching"); if (args->ar_debug) seq_printf(s, ",debug"); if (args->ar_upgrade) seq_printf(s, ",upgrade"); if (args->ar_posix_acl) seq_printf(s, ",acl"); if (args->ar_quota != GFS2_QUOTA_DEFAULT) { char *state; switch (args->ar_quota) { case GFS2_QUOTA_OFF: state = "off"; break; case GFS2_QUOTA_ACCOUNT: state = "account"; break; case GFS2_QUOTA_ON: state = "on"; break; default: state = "unknown"; break; } seq_printf(s, ",quota=%s", state); } if (args->ar_suiddir) seq_printf(s, ",suiddir"); if (args->ar_data != GFS2_DATA_DEFAULT) { char *state; switch (args->ar_data) { case GFS2_DATA_WRITEBACK: state = "writeback"; break; case GFS2_DATA_ORDERED: state = "ordered"; break; default: state = "unknown"; break; } seq_printf(s, ",data=%s", state); } return 0; } /* * We have to (at the moment) hold the inodes main lock to cover * the gap between unlocking the shared lock on the iopen lock and * taking the exclusive lock. I'd rather do a shared -> exclusive * conversion on the iopen lock, but we can change that later. This * is safe, just less efficient. */ static void gfs2_delete_inode(struct inode *inode) { struct gfs2_sbd *sdp = inode->i_sb->s_fs_info; struct gfs2_inode *ip = GFS2_I(inode); struct gfs2_holder gh; int error; if (!test_bit(GIF_USER, &ip->i_flags)) goto out; error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); if (unlikely(error)) { gfs2_glock_dq_uninit(&ip->i_iopen_gh); goto out; } gfs2_glock_dq_wait(&ip->i_iopen_gh); gfs2_holder_reinit(LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB | GL_NOCACHE, &ip->i_iopen_gh); error = gfs2_glock_nq(&ip->i_iopen_gh); if (error) goto out_truncate; if (S_ISDIR(inode->i_mode) && (ip->i_diskflags & GFS2_DIF_EXHASH)) { error = gfs2_dir_exhash_dealloc(ip); if (error) goto out_unlock; } if (ip->i_eattr) { error = gfs2_ea_dealloc(ip); if (error) goto out_unlock; } if (!gfs2_is_stuffed(ip)) { error = gfs2_file_dealloc(ip); if (error) goto out_unlock; } error = gfs2_dinode_dealloc(ip); if (error) goto out_unlock; out_truncate: error = gfs2_trans_begin(sdp, 0, sdp->sd_jdesc->jd_blocks); if (error) goto out_unlock; /* Needs to be done before glock release & also in a transaction */ truncate_inode_pages(&inode->i_data, 0); gfs2_trans_end(sdp); out_unlock: if (test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags)) gfs2_glock_dq(&ip->i_iopen_gh); gfs2_holder_uninit(&ip->i_iopen_gh); gfs2_glock_dq_uninit(&gh); if (error && error != GLR_TRYFAILED) fs_warn(sdp, "gfs2_delete_inode: %d\n", error); out: truncate_inode_pages(&inode->i_data, 0); clear_inode(inode); } static struct inode *gfs2_alloc_inode(struct super_block *sb) { struct gfs2_inode *ip; ip = kmem_cache_alloc(gfs2_inode_cachep, GFP_KERNEL); if (ip) { ip->i_flags = 0; ip->i_gl = NULL; } return &ip->i_inode; } static void gfs2_destroy_inode(struct inode *inode) { kmem_cache_free(gfs2_inode_cachep, inode); } const struct super_operations gfs2_super_ops = { .alloc_inode = gfs2_alloc_inode, .destroy_inode = gfs2_destroy_inode, .write_inode = gfs2_write_inode, .delete_inode = gfs2_delete_inode, .put_super = gfs2_put_super, .write_super = gfs2_write_super, .sync_fs = gfs2_sync_fs, .freeze_fs = gfs2_freeze, .unfreeze_fs = gfs2_unfreeze, .statfs = gfs2_statfs, .remount_fs = gfs2_remount_fs, .clear_inode = gfs2_clear_inode, .drop_inode = gfs2_drop_inode, .show_options = gfs2_show_options, };