/* * 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/slab.h> #include <linux/spinlock.h> #include <linux/completion.h> #include <linux/buffer_head.h> #include <linux/gfs2_ondisk.h> #include <linux/bio.h> #include <linux/posix_acl.h> #include "gfs2.h" #include "incore.h" #include "bmap.h" #include "glock.h" #include "glops.h" #include "inode.h" #include "log.h" #include "meta_io.h" #include "recovery.h" #include "rgrp.h" #include "util.h" #include "trans.h" /** * ail_empty_gl - remove all buffers for a given lock from the AIL * @gl: the glock * * None of the buffers should be dirty, locked, or pinned. */ static void gfs2_ail_empty_gl(struct gfs2_glock *gl) { struct gfs2_sbd *sdp = gl->gl_sbd; struct list_head *head = &gl->gl_ail_list; struct gfs2_bufdata *bd; struct buffer_head *bh; struct gfs2_trans tr; memset(&tr, 0, sizeof(tr)); tr.tr_revokes = atomic_read(&gl->gl_ail_count); if (!tr.tr_revokes) return; /* A shortened, inline version of gfs2_trans_begin() */ tr.tr_reserved = 1 + gfs2_struct2blk(sdp, tr.tr_revokes, sizeof(u64)); tr.tr_ip = (unsigned long)__builtin_return_address(0); INIT_LIST_HEAD(&tr.tr_list_buf); gfs2_log_reserve(sdp, tr.tr_reserved); BUG_ON(current->journal_info); current->journal_info = &tr; gfs2_log_lock(sdp); while (!list_empty(head)) { bd = list_entry(head->next, struct gfs2_bufdata, bd_ail_gl_list); bh = bd->bd_bh; gfs2_remove_from_ail(bd); bd->bd_bh = NULL; bh->b_private = NULL; bd->bd_blkno = bh->b_blocknr; gfs2_assert_withdraw(sdp, !buffer_busy(bh)); gfs2_trans_add_revoke(sdp, bd); } gfs2_assert_withdraw(sdp, !atomic_read(&gl->gl_ail_count)); gfs2_log_unlock(sdp); gfs2_trans_end(sdp); gfs2_log_flush(sdp, NULL); } /** * rgrp_go_sync - sync out the metadata for this glock * @gl: the glock * * Called when demoting or unlocking an EX glock. We must flush * to disk all dirty buffers/pages relating to this glock, and must not * not return to caller to demote/unlock the glock until I/O is complete. */ static void rgrp_go_sync(struct gfs2_glock *gl) { struct address_space *metamapping = gl->gl_aspace->i_mapping; int error; if (!test_and_clear_bit(GLF_DIRTY, &gl->gl_flags)) return; BUG_ON(gl->gl_state != LM_ST_EXCLUSIVE); gfs2_log_flush(gl->gl_sbd, gl); filemap_fdatawrite(metamapping); error = filemap_fdatawait(metamapping); mapping_set_error(metamapping, error); gfs2_ail_empty_gl(gl); } /** * rgrp_go_inval - invalidate the metadata for this glock * @gl: the glock * @flags: * * We never used LM_ST_DEFERRED with resource groups, so that we * should always see the metadata flag set here. * */ static void rgrp_go_inval(struct gfs2_glock *gl, int flags) { struct address_space *mapping = gl->gl_aspace->i_mapping; BUG_ON(!(flags & DIO_METADATA)); gfs2_assert_withdraw(gl->gl_sbd, !atomic_read(&gl->gl_ail_count)); truncate_inode_pages(mapping, 0); if (gl->gl_object) { struct gfs2_rgrpd *rgd = (struct gfs2_rgrpd *)gl->gl_object; rgd->rd_flags &= ~GFS2_RDF_UPTODATE; } } /** * inode_go_sync - Sync the dirty data and/or metadata for an inode glock * @gl: the glock protecting the inode * */ static void inode_go_sync(struct gfs2_glock *gl) { struct gfs2_inode *ip = gl->gl_object; struct address_space *metamapping = gl->gl_aspace->i_mapping; int error; if (ip && !S_ISREG(ip->i_inode.i_mode)) ip = NULL; if (ip && test_and_clear_bit(GIF_SW_PAGED, &ip->i_flags)) unmap_shared_mapping_range(ip->i_inode.i_mapping, 0, 0); if (!test_and_clear_bit(GLF_DIRTY, &gl->gl_flags)) return; BUG_ON(gl->gl_state != LM_ST_EXCLUSIVE); gfs2_log_flush(gl->gl_sbd, gl); filemap_fdatawrite(metamapping); if (ip) { struct address_space *mapping = ip->i_inode.i_mapping; filemap_fdatawrite(mapping); error = filemap_fdatawait(mapping); mapping_set_error(mapping, error); } error = filemap_fdatawait(metamapping); mapping_set_error(metamapping, error); gfs2_ail_empty_gl(gl); /* * Writeback of the data mapping may cause the dirty flag to be set * so we have to clear it again here. */ smp_mb__before_clear_bit(); clear_bit(GLF_DIRTY, &gl->gl_flags); } /** * inode_go_inval - prepare a inode glock to be released * @gl: the glock * @flags: * * Normally we invlidate everything, but if we are moving into * LM_ST_DEFERRED from LM_ST_SHARED or LM_ST_EXCLUSIVE then we * can keep hold of the metadata, since it won't have changed. * */ static void inode_go_inval(struct gfs2_glock *gl, int flags) { struct gfs2_inode *ip = gl->gl_object; gfs2_assert_withdraw(gl->gl_sbd, !atomic_read(&gl->gl_ail_count)); if (flags & DIO_METADATA) { struct address_space *mapping = gl->gl_aspace->i_mapping; truncate_inode_pages(mapping, 0); if (ip) { set_bit(GIF_INVALID, &ip->i_flags); forget_all_cached_acls(&ip->i_inode); } } if (ip == GFS2_I(gl->gl_sbd->sd_rindex)) gl->gl_sbd->sd_rindex_uptodate = 0; if (ip && S_ISREG(ip->i_inode.i_mode)) truncate_inode_pages(ip->i_inode.i_mapping, 0); } /** * inode_go_demote_ok - Check to see if it's ok to unlock an inode glock * @gl: the glock * * Returns: 1 if it's ok */ static int inode_go_demote_ok(const struct gfs2_glock *gl) { struct gfs2_sbd *sdp = gl->gl_sbd; if (sdp->sd_jindex == gl->gl_object || sdp->sd_rindex == gl->gl_object) return 0; return 1; } /** * inode_go_lock - operation done after an inode lock is locked by a process * @gl: the glock * @flags: * * Returns: errno */ static int inode_go_lock(struct gfs2_holder *gh) { struct gfs2_glock *gl = gh->gh_gl; struct gfs2_sbd *sdp = gl->gl_sbd; struct gfs2_inode *ip = gl->gl_object; int error = 0; if (!ip || (gh->gh_flags & GL_SKIP)) return 0; if (test_bit(GIF_INVALID, &ip->i_flags)) { error = gfs2_inode_refresh(ip); if (error) return error; } if ((ip->i_diskflags & GFS2_DIF_TRUNC_IN_PROG) && (gl->gl_state == LM_ST_EXCLUSIVE) && (gh->gh_state == LM_ST_EXCLUSIVE)) { spin_lock(&sdp->sd_trunc_lock); if (list_empty(&ip->i_trunc_list)) list_add(&sdp->sd_trunc_list, &ip->i_trunc_list); spin_unlock(&sdp->sd_trunc_lock); wake_up(&sdp->sd_quota_wait); return 1; } return error; } /** * inode_go_dump - print information about an inode * @seq: The iterator * @ip: the inode * * Returns: 0 on success, -ENOBUFS when we run out of space */ static int inode_go_dump(struct seq_file *seq, const struct gfs2_glock *gl) { const struct gfs2_inode *ip = gl->gl_object; if (ip == NULL) return 0; gfs2_print_dbg(seq, " I: n:%llu/%llu t:%u f:0x%02lx d:0x%08x s:%llu/%llu\n", (unsigned long long)ip->i_no_formal_ino, (unsigned long long)ip->i_no_addr, IF2DT(ip->i_inode.i_mode), ip->i_flags, (unsigned int)ip->i_diskflags, (unsigned long long)ip->i_inode.i_size, (unsigned long long)ip->i_disksize); return 0; } /** * rgrp_go_demote_ok - Check to see if it's ok to unlock a RG's glock * @gl: the glock * * Returns: 1 if it's ok */ static int rgrp_go_demote_ok(const struct gfs2_glock *gl) { return !gl->gl_aspace->i_mapping->nrpages; } /** * rgrp_go_lock - operation done after an rgrp lock is locked by * a first holder on this node. * @gl: the glock * @flags: * * Returns: errno */ static int rgrp_go_lock(struct gfs2_holder *gh) { return gfs2_rgrp_bh_get(gh->gh_gl->gl_object); } /** * rgrp_go_unlock - operation done before an rgrp lock is unlocked by * a last holder on this node. * @gl: the glock * @flags: * */ static void rgrp_go_unlock(struct gfs2_holder *gh) { gfs2_rgrp_bh_put(gh->gh_gl->gl_object); } /** * trans_go_sync - promote/demote the transaction glock * @gl: the glock * @state: the requested state * @flags: * */ static void trans_go_sync(struct gfs2_glock *gl) { struct gfs2_sbd *sdp = gl->gl_sbd; if (gl->gl_state != LM_ST_UNLOCKED && test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) { flush_workqueue(gfs2_delete_workqueue); gfs2_meta_syncfs(sdp); gfs2_log_shutdown(sdp); } } /** * trans_go_xmote_bh - After promoting/demoting the transaction glock * @gl: the glock * */ static int trans_go_xmote_bh(struct gfs2_glock *gl, struct gfs2_holder *gh) { struct gfs2_sbd *sdp = gl->gl_sbd; struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode); struct gfs2_glock *j_gl = ip->i_gl; struct gfs2_log_header_host head; int error; if (test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) { j_gl->gl_ops->go_inval(j_gl, DIO_METADATA); error = gfs2_find_jhead(sdp->sd_jdesc, &head); if (error) gfs2_consist(sdp); if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) gfs2_consist(sdp); /* Initialize some head of the log stuff */ if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) { sdp->sd_log_sequence = head.lh_sequence + 1; gfs2_log_pointers_init(sdp, head.lh_blkno); } } return 0; } /** * trans_go_demote_ok * @gl: the glock * * Always returns 0 */ static int trans_go_demote_ok(const struct gfs2_glock *gl) { return 0; } /** * iopen_go_callback - schedule the dcache entry for the inode to be deleted * @gl: the glock * * gl_spin lock is held while calling this */ static void iopen_go_callback(struct gfs2_glock *gl) { struct gfs2_inode *ip = (struct gfs2_inode *)gl->gl_object; if (gl->gl_demote_state == LM_ST_UNLOCKED && gl->gl_state == LM_ST_SHARED && ip && test_bit(GIF_USER, &ip->i_flags)) { gfs2_glock_hold(gl); if (queue_work(gfs2_delete_workqueue, &gl->gl_delete) == 0) gfs2_glock_put_nolock(gl); } } const struct gfs2_glock_operations gfs2_meta_glops = { .go_type = LM_TYPE_META, }; const struct gfs2_glock_operations gfs2_inode_glops = { .go_xmote_th = inode_go_sync, .go_inval = inode_go_inval, .go_demote_ok = inode_go_demote_ok, .go_lock = inode_go_lock, .go_dump = inode_go_dump, .go_type = LM_TYPE_INODE, .go_min_hold_time = HZ / 5, }; const struct gfs2_glock_operations gfs2_rgrp_glops = { .go_xmote_th = rgrp_go_sync, .go_inval = rgrp_go_inval, .go_demote_ok = rgrp_go_demote_ok, .go_lock = rgrp_go_lock, .go_unlock = rgrp_go_unlock, .go_dump = gfs2_rgrp_dump, .go_type = LM_TYPE_RGRP, .go_min_hold_time = HZ / 5, }; const struct gfs2_glock_operations gfs2_trans_glops = { .go_xmote_th = trans_go_sync, .go_xmote_bh = trans_go_xmote_bh, .go_demote_ok = trans_go_demote_ok, .go_type = LM_TYPE_NONDISK, }; const struct gfs2_glock_operations gfs2_iopen_glops = { .go_type = LM_TYPE_IOPEN, .go_callback = iopen_go_callback, }; const struct gfs2_glock_operations gfs2_flock_glops = { .go_type = LM_TYPE_FLOCK, }; const struct gfs2_glock_operations gfs2_nondisk_glops = { .go_type = LM_TYPE_NONDISK, }; const struct gfs2_glock_operations gfs2_quota_glops = { .go_type = LM_TYPE_QUOTA, }; const struct gfs2_glock_operations gfs2_journal_glops = { .go_type = LM_TYPE_JOURNAL, }; const struct gfs2_glock_operations *gfs2_glops_list[] = { [LM_TYPE_META] = &gfs2_meta_glops, [LM_TYPE_INODE] = &gfs2_inode_glops, [LM_TYPE_RGRP] = &gfs2_rgrp_glops, [LM_TYPE_NONDISK] = &gfs2_trans_glops, [LM_TYPE_IOPEN] = &gfs2_iopen_glops, [LM_TYPE_FLOCK] = &gfs2_flock_glops, [LM_TYPE_NONDISK] = &gfs2_nondisk_glops, [LM_TYPE_QUOTA] = &gfs2_quota_glops, [LM_TYPE_JOURNAL] = &gfs2_journal_glops, };