/* * 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 #include #include #include #include #include #include #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" #include "dir.h" struct workqueue_struct *gfs2_freeze_wq; static void gfs2_ail_error(struct gfs2_glock *gl, const struct buffer_head *bh) { fs_err(gl->gl_name.ln_sbd, "AIL buffer %p: blocknr %llu state 0x%08lx mapping %p page " "state 0x%lx\n", bh, (unsigned long long)bh->b_blocknr, bh->b_state, bh->b_page->mapping, bh->b_page->flags); fs_err(gl->gl_name.ln_sbd, "AIL glock %u:%llu mapping %p\n", gl->gl_name.ln_type, gl->gl_name.ln_number, gfs2_glock2aspace(gl)); gfs2_lm_withdraw(gl->gl_name.ln_sbd, "AIL error\n"); } /** * __gfs2_ail_flush - remove all buffers for a given lock from the AIL * @gl: the glock * @fsync: set when called from fsync (not all buffers will be clean) * * None of the buffers should be dirty, locked, or pinned. */ static void __gfs2_ail_flush(struct gfs2_glock *gl, bool fsync, unsigned int nr_revokes) { struct gfs2_sbd *sdp = gl->gl_name.ln_sbd; struct list_head *head = &gl->gl_ail_list; struct gfs2_bufdata *bd, *tmp; struct buffer_head *bh; const unsigned long b_state = (1UL << BH_Dirty)|(1UL << BH_Pinned)|(1UL << BH_Lock); gfs2_log_lock(sdp); spin_lock(&sdp->sd_ail_lock); list_for_each_entry_safe_reverse(bd, tmp, head, bd_ail_gl_list) { if (nr_revokes == 0) break; bh = bd->bd_bh; if (bh->b_state & b_state) { if (fsync) continue; gfs2_ail_error(gl, bh); } gfs2_trans_add_revoke(sdp, bd); nr_revokes--; } GLOCK_BUG_ON(gl, !fsync && atomic_read(&gl->gl_ail_count)); spin_unlock(&sdp->sd_ail_lock); gfs2_log_unlock(sdp); } static void gfs2_ail_empty_gl(struct gfs2_glock *gl) { struct gfs2_sbd *sdp = gl->gl_name.ln_sbd; struct gfs2_trans tr; memset(&tr, 0, sizeof(tr)); INIT_LIST_HEAD(&tr.tr_buf); INIT_LIST_HEAD(&tr.tr_databuf); tr.tr_revokes = atomic_read(&gl->gl_ail_count); if (!tr.tr_revokes) return; /* A shortened, inline version of gfs2_trans_begin() * tr->alloced is not set since the transaction structure is * on the stack */ tr.tr_reserved = 1 + gfs2_struct2blk(sdp, tr.tr_revokes, sizeof(u64)); tr.tr_ip = _RET_IP_; if (gfs2_log_reserve(sdp, tr.tr_reserved) < 0) return; WARN_ON_ONCE(current->journal_info); current->journal_info = &tr; __gfs2_ail_flush(gl, 0, tr.tr_revokes); gfs2_trans_end(sdp); gfs2_log_flush(sdp, NULL, NORMAL_FLUSH); } void gfs2_ail_flush(struct gfs2_glock *gl, bool fsync) { struct gfs2_sbd *sdp = gl->gl_name.ln_sbd; unsigned int revokes = atomic_read(&gl->gl_ail_count); unsigned int max_revokes = (sdp->sd_sb.sb_bsize - sizeof(struct gfs2_log_descriptor)) / sizeof(u64); int ret; if (!revokes) return; while (revokes > max_revokes) max_revokes += (sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header)) / sizeof(u64); ret = gfs2_trans_begin(sdp, 0, max_revokes); if (ret) return; __gfs2_ail_flush(gl, fsync, max_revokes); gfs2_trans_end(sdp); gfs2_log_flush(sdp, NULL, NORMAL_FLUSH); } /** * 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 gfs2_sbd *sdp = gl->gl_name.ln_sbd; struct address_space *mapping = &sdp->sd_aspace; struct gfs2_rgrpd *rgd; int error; spin_lock(&gl->gl_lockref.lock); rgd = gl->gl_object; if (rgd) gfs2_rgrp_brelse(rgd); spin_unlock(&gl->gl_lockref.lock); if (!test_and_clear_bit(GLF_DIRTY, &gl->gl_flags)) return; GLOCK_BUG_ON(gl, gl->gl_state != LM_ST_EXCLUSIVE); gfs2_log_flush(sdp, gl, NORMAL_FLUSH); filemap_fdatawrite_range(mapping, gl->gl_vm.start, gl->gl_vm.end); error = filemap_fdatawait_range(mapping, gl->gl_vm.start, gl->gl_vm.end); mapping_set_error(mapping, error); gfs2_ail_empty_gl(gl); spin_lock(&gl->gl_lockref.lock); rgd = gl->gl_object; if (rgd) gfs2_free_clones(rgd); spin_unlock(&gl->gl_lockref.lock); } /** * 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 gfs2_sbd *sdp = gl->gl_name.ln_sbd; struct address_space *mapping = &sdp->sd_aspace; struct gfs2_rgrpd *rgd = gl->gl_object; if (rgd) gfs2_rgrp_brelse(rgd); WARN_ON_ONCE(!(flags & DIO_METADATA)); gfs2_assert_withdraw(sdp, !atomic_read(&gl->gl_ail_count)); truncate_inode_pages_range(mapping, gl->gl_vm.start, gl->gl_vm.end); if (rgd) 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 = gfs2_glock2aspace(gl); int error; if (ip && !S_ISREG(ip->i_inode.i_mode)) ip = NULL; if (ip) { if (test_and_clear_bit(GIF_SW_PAGED, &ip->i_flags)) unmap_shared_mapping_range(ip->i_inode.i_mapping, 0, 0); inode_dio_wait(&ip->i_inode); } if (!test_and_clear_bit(GLF_DIRTY, &gl->gl_flags)) return; GLOCK_BUG_ON(gl, gl->gl_state != LM_ST_EXCLUSIVE); gfs2_log_flush(gl->gl_name.ln_sbd, gl, NORMAL_FLUSH); 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_atomic(); clear_bit(GLF_DIRTY, &gl->gl_flags); } /** * inode_go_inval - prepare a inode glock to be released * @gl: the glock * @flags: * * Normally we invalidate 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_name.ln_sbd, !atomic_read(&gl->gl_ail_count)); if (flags & DIO_METADATA) { struct address_space *mapping = gfs2_glock2aspace(gl); truncate_inode_pages(mapping, 0); if (ip) { set_bit(GIF_INVALID, &ip->i_flags); forget_all_cached_acls(&ip->i_inode); security_inode_invalidate_secctx(&ip->i_inode); gfs2_dir_hash_inval(ip); } } if (ip == GFS2_I(gl->gl_name.ln_sbd->sd_rindex)) { gfs2_log_flush(gl->gl_name.ln_sbd, NULL, NORMAL_FLUSH); gl->gl_name.ln_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_name.ln_sbd; if (sdp->sd_jindex == gl->gl_object || sdp->sd_rindex == gl->gl_object) return 0; return 1; } /** * gfs2_set_nlink - Set the inode's link count based on on-disk info * @inode: The inode in question * @nlink: The link count * * If the link count has hit zero, it must never be raised, whatever the * on-disk inode might say. When new struct inodes are created the link * count is set to 1, so that we can safely use this test even when reading * in on disk information for the first time. */ static void gfs2_set_nlink(struct inode *inode, u32 nlink) { /* * We will need to review setting the nlink count here in the * light of the forthcoming ro bind mount work. This is a reminder * to do that. */ if ((inode->i_nlink != nlink) && (inode->i_nlink != 0)) { if (nlink == 0) clear_nlink(inode); else set_nlink(inode, nlink); } } static int gfs2_dinode_in(struct gfs2_inode *ip, const void *buf) { const struct gfs2_dinode *str = buf; struct timespec atime; u16 height, depth; if (unlikely(ip->i_no_addr != be64_to_cpu(str->di_num.no_addr))) goto corrupt; ip->i_no_formal_ino = be64_to_cpu(str->di_num.no_formal_ino); ip->i_inode.i_mode = be32_to_cpu(str->di_mode); ip->i_inode.i_rdev = 0; switch (ip->i_inode.i_mode & S_IFMT) { case S_IFBLK: case S_IFCHR: ip->i_inode.i_rdev = MKDEV(be32_to_cpu(str->di_major), be32_to_cpu(str->di_minor)); break; }; i_uid_write(&ip->i_inode, be32_to_cpu(str->di_uid)); i_gid_write(&ip->i_inode, be32_to_cpu(str->di_gid)); gfs2_set_nlink(&ip->i_inode, be32_to_cpu(str->di_nlink)); i_size_write(&ip->i_inode, be64_to_cpu(str->di_size)); gfs2_set_inode_blocks(&ip->i_inode, be64_to_cpu(str->di_blocks)); atime.tv_sec = be64_to_cpu(str->di_atime); atime.tv_nsec = be32_to_cpu(str->di_atime_nsec); if (timespec_compare(&ip->i_inode.i_atime, &atime) < 0) ip->i_inode.i_atime = atime; ip->i_inode.i_mtime.tv_sec = be64_to_cpu(str->di_mtime); ip->i_inode.i_mtime.tv_nsec = be32_to_cpu(str->di_mtime_nsec); ip->i_inode.i_ctime.tv_sec = be64_to_cpu(str->di_ctime); ip->i_inode.i_ctime.tv_nsec = be32_to_cpu(str->di_ctime_nsec); ip->i_goal = be64_to_cpu(str->di_goal_meta); ip->i_generation = be64_to_cpu(str->di_generation); ip->i_diskflags = be32_to_cpu(str->di_flags); ip->i_eattr = be64_to_cpu(str->di_eattr); /* i_diskflags and i_eattr must be set before gfs2_set_inode_flags() */ gfs2_set_inode_flags(&ip->i_inode); height = be16_to_cpu(str->di_height); if (unlikely(height > GFS2_MAX_META_HEIGHT)) goto corrupt; ip->i_height = (u8)height; depth = be16_to_cpu(str->di_depth); if (unlikely(depth > GFS2_DIR_MAX_DEPTH)) goto corrupt; ip->i_depth = (u8)depth; ip->i_entries = be32_to_cpu(str->di_entries); if (S_ISREG(ip->i_inode.i_mode)) gfs2_set_aops(&ip->i_inode); return 0; corrupt: gfs2_consist_inode(ip); return -EIO; } /** * gfs2_inode_refresh - Refresh the incore copy of the dinode * @ip: The GFS2 inode * * Returns: errno */ int gfs2_inode_refresh(struct gfs2_inode *ip) { struct buffer_head *dibh; int error; error = gfs2_meta_inode_buffer(ip, &dibh); if (error) return error; error = gfs2_dinode_in(ip, dibh->b_data); brelse(dibh); clear_bit(GIF_INVALID, &ip->i_flags); return error; } /** * 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_name.ln_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 (gh->gh_state != LM_ST_DEFERRED) inode_dio_wait(&ip->i_inode); 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 * */ static void inode_go_dump(struct seq_file *seq, const struct gfs2_glock *gl) { const struct gfs2_inode *ip = gl->gl_object; if (ip == NULL) return; gfs2_print_dbg(seq, " I: n:%llu/%llu t:%u f:0x%02lx d:0x%08x s:%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)i_size_read(&ip->i_inode)); } /** * freeze_go_sync - promote/demote the freeze glock * @gl: the glock * @state: the requested state * @flags: * */ static void freeze_go_sync(struct gfs2_glock *gl) { int error = 0; struct gfs2_sbd *sdp = gl->gl_name.ln_sbd; if (gl->gl_state == LM_ST_SHARED && test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) { atomic_set(&sdp->sd_freeze_state, SFS_STARTING_FREEZE); error = freeze_super(sdp->sd_vfs); if (error) { printk(KERN_INFO "GFS2: couldn't freeze filesystem: %d\n", error); gfs2_assert_withdraw(sdp, 0); } queue_work(gfs2_freeze_wq, &sdp->sd_freeze_work); gfs2_log_flush(sdp, NULL, FREEZE_FLUSH); } } /** * freeze_go_xmote_bh - After promoting/demoting the freeze glock * @gl: the glock * */ static int freeze_go_xmote_bh(struct gfs2_glock *gl, struct gfs2_holder *gh) { struct gfs2_sbd *sdp = gl->gl_name.ln_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 freeze_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_lockref.lock lock is held while calling this */ static void iopen_go_callback(struct gfs2_glock *gl, bool remote) { struct gfs2_inode *ip = (struct gfs2_inode *)gl->gl_object; struct gfs2_sbd *sdp = gl->gl_name.ln_sbd; if (!remote || (sdp->sd_vfs->s_flags & MS_RDONLY)) return; if (gl->gl_demote_state == LM_ST_UNLOCKED && gl->gl_state == LM_ST_SHARED && ip) { gl->gl_lockref.count++; if (queue_work(gfs2_delete_workqueue, &gl->gl_delete) == 0) gl->gl_lockref.count--; } } const struct gfs2_glock_operations gfs2_meta_glops = { .go_type = LM_TYPE_META, }; const struct gfs2_glock_operations gfs2_inode_glops = { .go_sync = 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_flags = GLOF_ASPACE | GLOF_LRU, }; const struct gfs2_glock_operations gfs2_rgrp_glops = { .go_sync = rgrp_go_sync, .go_inval = rgrp_go_inval, .go_lock = gfs2_rgrp_go_lock, .go_unlock = gfs2_rgrp_go_unlock, .go_dump = gfs2_rgrp_dump, .go_type = LM_TYPE_RGRP, .go_flags = GLOF_LVB, }; const struct gfs2_glock_operations gfs2_freeze_glops = { .go_sync = freeze_go_sync, .go_xmote_bh = freeze_go_xmote_bh, .go_demote_ok = freeze_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, .go_flags = GLOF_LRU, }; const struct gfs2_glock_operations gfs2_flock_glops = { .go_type = LM_TYPE_FLOCK, .go_flags = GLOF_LRU, }; 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, .go_flags = GLOF_LVB | GLOF_LRU, }; 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_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, };