/* * 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 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/gfs2_ondisk.h> #include <linux/lm_interface.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; unsigned int blocks; struct list_head *head = &gl->gl_ail_list; struct gfs2_bufdata *bd; struct buffer_head *bh; u64 blkno; int error; blocks = atomic_read(&gl->gl_ail_count); if (!blocks) return; error = gfs2_trans_begin(sdp, 0, blocks); if (gfs2_assert_withdraw(sdp, !error)) return; gfs2_log_lock(sdp); while (!list_empty(head)) { bd = list_entry(head->next, struct gfs2_bufdata, bd_ail_gl_list); bh = bd->bd_bh; blkno = bh->b_blocknr; gfs2_assert_withdraw(sdp, !buffer_busy(bh)); bd->bd_ail = NULL; list_del(&bd->bd_ail_st_list); list_del(&bd->bd_ail_gl_list); atomic_dec(&gl->gl_ail_count); brelse(bh); gfs2_log_unlock(sdp); gfs2_trans_add_revoke(sdp, blkno); gfs2_log_lock(sdp); } gfs2_assert_withdraw(sdp, !atomic_read(&gl->gl_ail_count)); gfs2_log_unlock(sdp); gfs2_trans_end(sdp); gfs2_log_flush(sdp, NULL); } /** * gfs2_pte_inval - Sync and invalidate all PTEs associated with a glock * @gl: the glock * */ static void gfs2_pte_inval(struct gfs2_glock *gl) { struct gfs2_inode *ip; struct inode *inode; ip = gl->gl_object; inode = &ip->i_inode; if (!ip || !S_ISREG(ip->i_di.di_mode)) return; if (!test_bit(GIF_PAGED, &ip->i_flags)) return; unmap_shared_mapping_range(inode->i_mapping, 0, 0); if (test_bit(GIF_SW_PAGED, &ip->i_flags)) set_bit(GLF_DIRTY, &gl->gl_flags); clear_bit(GIF_SW_PAGED, &ip->i_flags); } /** * gfs2_page_inval - Invalidate all pages associated with a glock * @gl: the glock * */ static void gfs2_page_inval(struct gfs2_glock *gl) { struct gfs2_inode *ip; struct inode *inode; ip = gl->gl_object; inode = &ip->i_inode; if (!ip || !S_ISREG(ip->i_di.di_mode)) return; truncate_inode_pages(inode->i_mapping, 0); gfs2_assert_withdraw(GFS2_SB(&ip->i_inode), !inode->i_mapping->nrpages); clear_bit(GIF_PAGED, &ip->i_flags); } /** * gfs2_page_wait - Wait for writeback of data * @gl: the glock * * Syncs data (not metadata) for a regular file. * No-op for all other types. */ static void gfs2_page_wait(struct gfs2_glock *gl) { struct gfs2_inode *ip = gl->gl_object; struct inode *inode = &ip->i_inode; struct address_space *mapping = inode->i_mapping; int error; if (!S_ISREG(ip->i_di.di_mode)) return; error = filemap_fdatawait(mapping); /* Put back any errors cleared by filemap_fdatawait() so they can be caught by someone who can pass them up to user space. */ if (error == -ENOSPC) set_bit(AS_ENOSPC, &mapping->flags); else if (error) set_bit(AS_EIO, &mapping->flags); } static void gfs2_page_writeback(struct gfs2_glock *gl) { struct gfs2_inode *ip = gl->gl_object; struct inode *inode = &ip->i_inode; struct address_space *mapping = inode->i_mapping; if (!S_ISREG(ip->i_di.di_mode)) return; filemap_fdatawrite(mapping); } /** * meta_go_sync - sync out the metadata for this glock * @gl: the glock * @flags: DIO_* * * 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 meta_go_sync(struct gfs2_glock *gl, int flags) { if (!(flags & DIO_METADATA)) return; if (test_and_clear_bit(GLF_DIRTY, &gl->gl_flags)) { gfs2_log_flush(gl->gl_sbd, gl); gfs2_meta_sync(gl); if (flags & DIO_RELEASE) gfs2_ail_empty_gl(gl); } } /** * meta_go_inval - invalidate the metadata for this glock * @gl: the glock * @flags: * */ static void meta_go_inval(struct gfs2_glock *gl, int flags) { if (!(flags & DIO_METADATA)) return; gfs2_meta_inval(gl); gl->gl_vn++; } /** * inode_go_xmote_th - promote/demote a glock * @gl: the glock * @state: the requested state * @flags: * */ static void inode_go_xmote_th(struct gfs2_glock *gl, unsigned int state, int flags) { if (gl->gl_state != LM_ST_UNLOCKED) gfs2_pte_inval(gl); gfs2_glock_xmote_th(gl, state, flags); } /** * inode_go_xmote_bh - After promoting/demoting a glock * @gl: the glock * */ static void inode_go_xmote_bh(struct gfs2_glock *gl) { struct gfs2_holder *gh = gl->gl_req_gh; struct buffer_head *bh; int error; if (gl->gl_state != LM_ST_UNLOCKED && (!gh || !(gh->gh_flags & GL_SKIP))) { error = gfs2_meta_read(gl, gl->gl_name.ln_number, 0, &bh); if (!error) brelse(bh); } } /** * inode_go_drop_th - unlock a glock * @gl: the glock * * Invoked from rq_demote(). * Another node needs the lock in EXCLUSIVE mode, or lock (unused for too long) * is being purged from our node's glock cache; we're dropping lock. */ static void inode_go_drop_th(struct gfs2_glock *gl) { gfs2_pte_inval(gl); gfs2_glock_drop_th(gl); } /** * inode_go_sync - Sync the dirty data and/or metadata for an inode glock * @gl: the glock protecting the inode * @flags: * */ static void inode_go_sync(struct gfs2_glock *gl, int flags) { int meta = (flags & DIO_METADATA); int data = (flags & DIO_DATA); if (test_bit(GLF_DIRTY, &gl->gl_flags)) { if (meta && data) { gfs2_page_writeback(gl); gfs2_log_flush(gl->gl_sbd, gl); gfs2_meta_sync(gl); gfs2_page_wait(gl); clear_bit(GLF_DIRTY, &gl->gl_flags); } else if (meta) { gfs2_log_flush(gl->gl_sbd, gl); gfs2_meta_sync(gl); } else if (data) { gfs2_page_writeback(gl); gfs2_page_wait(gl); } if (flags & DIO_RELEASE) gfs2_ail_empty_gl(gl); } } /** * inode_go_inval - prepare a inode glock to be released * @gl: the glock * @flags: * */ static void inode_go_inval(struct gfs2_glock *gl, int flags) { int meta = (flags & DIO_METADATA); int data = (flags & DIO_DATA); if (meta) { gfs2_meta_inval(gl); gl->gl_vn++; } if (data) gfs2_page_inval(gl); } /** * 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(struct gfs2_glock *gl) { struct gfs2_sbd *sdp = gl->gl_sbd; int demote = 0; if (!gl->gl_object && !gl->gl_aspace->i_mapping->nrpages) demote = 1; else if (!sdp->sd_args.ar_localcaching && time_after_eq(jiffies, gl->gl_stamp + gfs2_tune_get(sdp, gt_demote_secs) * HZ)) demote = 1; return demote; } /** * 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_inode *ip = gl->gl_object; int error = 0; if (!ip) return 0; if (ip->i_vn != gl->gl_vn) { error = gfs2_inode_refresh(ip); if (error) return error; gfs2_inode_attr_in(ip); } if ((ip->i_di.di_flags & GFS2_DIF_TRUNC_IN_PROG) && (gl->gl_state == LM_ST_EXCLUSIVE) && (gh->gh_flags & GL_LOCAL_EXCL)) error = gfs2_truncatei_resume(ip); return error; } /** * inode_go_unlock - operation done before an inode lock is unlocked by a * process * @gl: the glock * @flags: * */ static void inode_go_unlock(struct gfs2_holder *gh) { struct gfs2_glock *gl = gh->gh_gl; struct gfs2_inode *ip = gl->gl_object; if (ip == NULL) return; if (test_bit(GLF_DIRTY, &gl->gl_flags)) gfs2_inode_attr_in(ip); gfs2_meta_cache_flush(ip); } /** * inode_greedy - * @gl: the glock * */ static void inode_greedy(struct gfs2_glock *gl) { struct gfs2_sbd *sdp = gl->gl_sbd; struct gfs2_inode *ip = gl->gl_object; unsigned int quantum = gfs2_tune_get(sdp, gt_greedy_quantum); unsigned int max = gfs2_tune_get(sdp, gt_greedy_max); unsigned int new_time; spin_lock(&ip->i_spin); if (time_after(ip->i_last_pfault + quantum, jiffies)) { new_time = ip->i_greedy + quantum; if (new_time > max) new_time = max; } else { new_time = ip->i_greedy - quantum; if (!new_time || new_time > max) new_time = 1; } ip->i_greedy = new_time; spin_unlock(&ip->i_spin); iput(&ip->i_inode); } /** * 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(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_xmote_th - promote/demote the transaction glock * @gl: the glock * @state: the requested state * @flags: * */ static void trans_go_xmote_th(struct gfs2_glock *gl, unsigned int state, int flags) { struct gfs2_sbd *sdp = gl->gl_sbd; if (gl->gl_state != LM_ST_UNLOCKED && test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) { gfs2_meta_syncfs(sdp); gfs2_log_shutdown(sdp); } gfs2_glock_xmote_th(gl, state, flags); } /** * trans_go_xmote_bh - After promoting/demoting the transaction glock * @gl: the glock * */ static void trans_go_xmote_bh(struct gfs2_glock *gl) { 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 (gl->gl_state != LM_ST_UNLOCKED && test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) { gfs2_meta_cache_flush(GFS2_I(sdp->sd_jdesc->jd_inode)); j_gl->gl_ops->go_inval(j_gl, DIO_METADATA | DIO_DATA); 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); } } } /** * trans_go_drop_th - unlock the transaction glock * @gl: the glock * * We want to sync the device even with localcaching. Remember * that localcaching journal replay only marks buffers dirty. */ static void trans_go_drop_th(struct gfs2_glock *gl) { struct gfs2_sbd *sdp = gl->gl_sbd; if (test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) { gfs2_meta_syncfs(sdp); gfs2_log_shutdown(sdp); } gfs2_glock_drop_th(gl); } /** * quota_go_demote_ok - Check to see if it's ok to unlock a quota glock * @gl: the glock * * Returns: 1 if it's ok */ static int quota_go_demote_ok(struct gfs2_glock *gl) { return !atomic_read(&gl->gl_lvb_count); } const struct gfs2_glock_operations gfs2_meta_glops = { .go_xmote_th = gfs2_glock_xmote_th, .go_drop_th = gfs2_glock_drop_th, .go_type = LM_TYPE_META, }; const struct gfs2_glock_operations gfs2_inode_glops = { .go_xmote_th = inode_go_xmote_th, .go_xmote_bh = inode_go_xmote_bh, .go_drop_th = inode_go_drop_th, .go_sync = inode_go_sync, .go_inval = inode_go_inval, .go_demote_ok = inode_go_demote_ok, .go_lock = inode_go_lock, .go_unlock = inode_go_unlock, .go_greedy = inode_greedy, .go_type = LM_TYPE_INODE, }; const struct gfs2_glock_operations gfs2_rgrp_glops = { .go_xmote_th = gfs2_glock_xmote_th, .go_drop_th = gfs2_glock_drop_th, .go_sync = meta_go_sync, .go_inval = meta_go_inval, .go_demote_ok = rgrp_go_demote_ok, .go_lock = rgrp_go_lock, .go_unlock = rgrp_go_unlock, .go_type = LM_TYPE_RGRP, }; const struct gfs2_glock_operations gfs2_trans_glops = { .go_xmote_th = trans_go_xmote_th, .go_xmote_bh = trans_go_xmote_bh, .go_drop_th = trans_go_drop_th, .go_type = LM_TYPE_NONDISK, }; const struct gfs2_glock_operations gfs2_iopen_glops = { .go_xmote_th = gfs2_glock_xmote_th, .go_drop_th = gfs2_glock_drop_th, .go_type = LM_TYPE_IOPEN, }; const struct gfs2_glock_operations gfs2_flock_glops = { .go_xmote_th = gfs2_glock_xmote_th, .go_drop_th = gfs2_glock_drop_th, .go_type = LM_TYPE_FLOCK, }; const struct gfs2_glock_operations gfs2_nondisk_glops = { .go_xmote_th = gfs2_glock_xmote_th, .go_drop_th = gfs2_glock_drop_th, .go_type = LM_TYPE_NONDISK, }; const struct gfs2_glock_operations gfs2_quota_glops = { .go_xmote_th = gfs2_glock_xmote_th, .go_drop_th = gfs2_glock_drop_th, .go_demote_ok = quota_go_demote_ok, .go_type = LM_TYPE_QUOTA, }; const struct gfs2_glock_operations gfs2_journal_glops = { .go_xmote_th = gfs2_glock_xmote_th, .go_drop_th = gfs2_glock_drop_th, .go_type = LM_TYPE_JOURNAL, };