forked from Minki/linux
18ec7d5c3f
This is a very large patch, with a few still to be resolved issues
so you might want to check out the previous head of the tree since
this is known to be unstable. Fixes for the various bugs will be
forthcoming shortly.
This patch removes the special data format which has been used
up till now for journaled data files. Directories still retain the
old format so that they will remain on disk compatible with earlier
releases. As a result you can now do the following with journaled
data files:
1) mmap them
2) export them over NFS
3) convert to/from normal files whenever you want to (the zero length
restriction is gone)
In addition the level at which GFS' locking is done has changed for all
files (since they all now use the page cache) such that the locking is
done at the page cache level rather than the level of the fs operations.
This should mean that things like loopback mounts and other things which
touch the page cache directly should now work.
Current known issues:
1. There is a lock mode inversion problem related to the resource
group hold function which needs to be resolved.
2. Any significant amount of I/O causes an oops with an offset of hex 320
(NULL pointer dereference) which appears to be related to a journaled data
buffer appearing on a list where it shouldn't be.
3. Direct I/O writes are disabled for the time being (will reappear later)
4. There is probably a deadlock between the page lock and GFS' locks under
certain combinations of mmap and fs operation I/O.
5. Issue relating to ref counting on internally used inodes causes a hang
on umount (discovered before this patch, and not fixed by it)
6. One part of the directory metadata is different from GFS1 and will need
to be resolved before next release.
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
247 lines
6.7 KiB
C
247 lines
6.7 KiB
C
/*
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* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
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* Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved.
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*
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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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* of the GNU General Public License v.2.
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*/
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/completion.h>
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#include <linux/buffer_head.h>
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#include <linux/crc32.h>
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#include <asm/semaphore.h>
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#include <asm/uaccess.h>
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#include "gfs2.h"
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#include "glock.h"
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#include "lm.h"
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kmem_cache_t *gfs2_glock_cachep __read_mostly;
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kmem_cache_t *gfs2_inode_cachep __read_mostly;
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kmem_cache_t *gfs2_bufdata_cachep __read_mostly;
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uint32_t gfs2_disk_hash(const char *data, int len)
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{
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return crc32_le(0xFFFFFFFF, data, len) ^ 0xFFFFFFFF;
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}
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void gfs2_assert_i(struct gfs2_sbd *sdp)
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{
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printk(KERN_EMERG "GFS2: fsid=%s: fatal assertion failed\n",
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sdp->sd_fsname);
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}
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/**
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* gfs2_assert_withdraw_i - Cause the machine to withdraw if @assertion is false
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* Returns: -1 if this call withdrew the machine,
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* -2 if it was already withdrawn
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*/
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int gfs2_assert_withdraw_i(struct gfs2_sbd *sdp, char *assertion,
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const char *function, char *file, unsigned int line)
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{
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int me;
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me = gfs2_lm_withdraw(sdp,
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"GFS2: fsid=%s: fatal: assertion \"%s\" failed\n"
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"GFS2: fsid=%s: function = %s, file = %s, line = %u\n",
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sdp->sd_fsname, assertion,
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sdp->sd_fsname, function, file, line);
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dump_stack();
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return (me) ? -1 : -2;
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}
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/**
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* gfs2_assert_warn_i - Print a message to the console if @assertion is false
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* Returns: -1 if we printed something
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* -2 if we didn't
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*/
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int gfs2_assert_warn_i(struct gfs2_sbd *sdp, char *assertion,
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const char *function, char *file, unsigned int line)
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{
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if (time_before(jiffies,
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sdp->sd_last_warning +
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gfs2_tune_get(sdp, gt_complain_secs) * HZ))
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return -2;
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printk(KERN_WARNING
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"GFS2: fsid=%s: warning: assertion \"%s\" failed\n"
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"GFS2: fsid=%s: function = %s, file = %s, line = %u\n",
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sdp->sd_fsname, assertion,
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sdp->sd_fsname, function, file, line);
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if (sdp->sd_args.ar_debug)
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BUG();
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else
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dump_stack();
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sdp->sd_last_warning = jiffies;
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return -1;
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}
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/**
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* gfs2_consist_i - Flag a filesystem consistency error and withdraw
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* Returns: -1 if this call withdrew the machine,
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* 0 if it was already withdrawn
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*/
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int gfs2_consist_i(struct gfs2_sbd *sdp, int cluster_wide, const char *function,
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char *file, unsigned int line)
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{
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int rv;
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rv = gfs2_lm_withdraw(sdp,
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"GFS2: fsid=%s: fatal: filesystem consistency error\n"
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"GFS2: fsid=%s: function = %s, file = %s, line = %u\n",
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sdp->sd_fsname,
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sdp->sd_fsname, function, file, line);
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return rv;
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}
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/**
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* gfs2_consist_inode_i - Flag an inode consistency error and withdraw
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* Returns: -1 if this call withdrew the machine,
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* 0 if it was already withdrawn
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*/
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int gfs2_consist_inode_i(struct gfs2_inode *ip, int cluster_wide,
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const char *function, char *file, unsigned int line)
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{
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struct gfs2_sbd *sdp = ip->i_sbd;
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int rv;
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rv = gfs2_lm_withdraw(sdp,
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"GFS2: fsid=%s: fatal: filesystem consistency error\n"
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"GFS2: fsid=%s: inode = %llu %llu\n"
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"GFS2: fsid=%s: function = %s, file = %s, line = %u\n",
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sdp->sd_fsname,
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sdp->sd_fsname, ip->i_num.no_formal_ino, ip->i_num.no_addr,
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sdp->sd_fsname, function, file, line);
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return rv;
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}
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/**
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* gfs2_consist_rgrpd_i - Flag a RG consistency error and withdraw
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* Returns: -1 if this call withdrew the machine,
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* 0 if it was already withdrawn
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*/
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int gfs2_consist_rgrpd_i(struct gfs2_rgrpd *rgd, int cluster_wide,
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const char *function, char *file, unsigned int line)
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{
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struct gfs2_sbd *sdp = rgd->rd_sbd;
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int rv;
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rv = gfs2_lm_withdraw(sdp,
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"GFS2: fsid=%s: fatal: filesystem consistency error\n"
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"GFS2: fsid=%s: RG = %llu\n"
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"GFS2: fsid=%s: function = %s, file = %s, line = %u\n",
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sdp->sd_fsname,
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sdp->sd_fsname, rgd->rd_ri.ri_addr,
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sdp->sd_fsname, function, file, line);
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return rv;
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}
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/**
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* gfs2_meta_check_ii - Flag a magic number consistency error and withdraw
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* Returns: -1 if this call withdrew the machine,
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* -2 if it was already withdrawn
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*/
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int gfs2_meta_check_ii(struct gfs2_sbd *sdp, struct buffer_head *bh,
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const char *type, const char *function, char *file,
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unsigned int line)
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{
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int me;
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me = gfs2_lm_withdraw(sdp,
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"GFS2: fsid=%s: fatal: invalid metadata block\n"
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"GFS2: fsid=%s: bh = %llu (%s)\n"
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"GFS2: fsid=%s: function = %s, file = %s, line = %u\n",
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sdp->sd_fsname,
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sdp->sd_fsname, (uint64_t)bh->b_blocknr, type,
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sdp->sd_fsname, function, file, line);
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return (me) ? -1 : -2;
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}
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/**
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* gfs2_metatype_check_ii - Flag a metadata type consistency error and withdraw
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* Returns: -1 if this call withdrew the machine,
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* -2 if it was already withdrawn
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*/
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int gfs2_metatype_check_ii(struct gfs2_sbd *sdp, struct buffer_head *bh,
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uint16_t type, uint16_t t, const char *function,
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char *file, unsigned int line)
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{
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int me;
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me = gfs2_lm_withdraw(sdp,
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"GFS2: fsid=%s: fatal: invalid metadata block\n"
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"GFS2: fsid=%s: bh = %llu (type: exp=%u, found=%u)\n"
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"GFS2: fsid=%s: function = %s, file = %s, line = %u\n",
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sdp->sd_fsname,
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sdp->sd_fsname, (uint64_t)bh->b_blocknr, type, t,
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sdp->sd_fsname, function, file, line);
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return (me) ? -1 : -2;
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}
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/**
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* gfs2_io_error_i - Flag an I/O error and withdraw
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* Returns: -1 if this call withdrew the machine,
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* 0 if it was already withdrawn
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*/
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int gfs2_io_error_i(struct gfs2_sbd *sdp, const char *function, char *file,
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unsigned int line)
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{
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int rv;
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rv = gfs2_lm_withdraw(sdp,
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"GFS2: fsid=%s: fatal: I/O error\n"
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"GFS2: fsid=%s: function = %s, file = %s, line = %u\n",
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sdp->sd_fsname,
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sdp->sd_fsname, function, file, line);
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return rv;
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}
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/**
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* gfs2_io_error_bh_i - Flag a buffer I/O error and withdraw
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* Returns: -1 if this call withdrew the machine,
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* 0 if it was already withdrawn
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*/
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int gfs2_io_error_bh_i(struct gfs2_sbd *sdp, struct buffer_head *bh,
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const char *function, char *file, unsigned int line)
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{
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int rv;
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rv = gfs2_lm_withdraw(sdp,
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"GFS2: fsid=%s: fatal: I/O error\n"
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"GFS2: fsid=%s: block = %llu\n"
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"GFS2: fsid=%s: function = %s, file = %s, line = %u\n",
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sdp->sd_fsname,
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sdp->sd_fsname, (uint64_t)bh->b_blocknr,
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sdp->sd_fsname, function, file, line);
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return rv;
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}
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void gfs2_icbit_munge(struct gfs2_sbd *sdp, unsigned char **bitmap,
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unsigned int bit, int new_value)
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{
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unsigned int c, o, b = bit;
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int old_value;
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c = b / (8 * PAGE_SIZE);
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b %= 8 * PAGE_SIZE;
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o = b / 8;
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b %= 8;
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old_value = (bitmap[c][o] & (1 << b));
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gfs2_assert_withdraw(sdp, !old_value != !new_value);
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if (new_value)
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bitmap[c][o] |= 1 << b;
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else
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bitmap[c][o] &= ~(1 << b);
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}
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