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-rw-r--r--fs/gfs2/util.c273
1 files changed, 273 insertions, 0 deletions
diff --git a/fs/gfs2/util.c b/fs/gfs2/util.c
new file mode 100644
index 000000000000..74e2c62f2370
--- /dev/null
+++ b/fs/gfs2/util.c
@@ -0,0 +1,273 @@
+/*
+ * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
+ * Copyright (C) 2004-2005 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 v.2.
+ */
+
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/completion.h>
+#include <linux/buffer_head.h>
+#include <linux/crc32.h>
+#include <asm/semaphore.h>
+#include <asm/uaccess.h>
+
+#include "gfs2.h"
+#include "glock.h"
+#include "lm.h"
+
+kmem_cache_t *gfs2_glock_cachep __read_mostly;
+kmem_cache_t *gfs2_inode_cachep __read_mostly;
+kmem_cache_t *gfs2_bufdata_cachep __read_mostly;
+
+uint32_t gfs2_disk_hash(const char *data, int len)
+{
+ return crc32_le(0xFFFFFFFF, data, len) ^ 0xFFFFFFFF;
+}
+
+void gfs2_assert_i(struct gfs2_sbd *sdp)
+{
+ printk(KERN_EMERG "GFS2: fsid=%s: fatal assertion failed\n",
+ sdp->sd_fsname);
+}
+
+/**
+ * gfs2_assert_withdraw_i - Cause the machine to withdraw if @assertion is false
+ * Returns: -1 if this call withdrew the machine,
+ * -2 if it was already withdrawn
+ */
+
+int gfs2_assert_withdraw_i(struct gfs2_sbd *sdp, char *assertion,
+ const char *function, char *file, unsigned int line)
+{
+ int me;
+ me = gfs2_lm_withdraw(sdp,
+ "GFS2: fsid=%s: fatal: assertion \"%s\" failed\n"
+ "GFS2: fsid=%s: function = %s, file = %s, line = %u\n",
+ sdp->sd_fsname, assertion,
+ sdp->sd_fsname, function, file, line);
+ return (me) ? -1 : -2;
+}
+
+/**
+ * gfs2_assert_warn_i - Print a message to the console if @assertion is false
+ * Returns: -1 if we printed something
+ * -2 if we didn't
+ */
+
+int gfs2_assert_warn_i(struct gfs2_sbd *sdp, char *assertion,
+ const char *function, char *file, unsigned int line)
+{
+ if (time_before(jiffies,
+ sdp->sd_last_warning +
+ gfs2_tune_get(sdp, gt_complain_secs) * HZ))
+ return -2;
+
+ printk(KERN_WARNING
+ "GFS2: fsid=%s: warning: assertion \"%s\" failed\n"
+ "GFS2: fsid=%s: function = %s, file = %s, line = %u\n",
+ sdp->sd_fsname, assertion,
+ sdp->sd_fsname, function, file, line);
+
+ if (sdp->sd_args.ar_debug)
+ BUG();
+
+ sdp->sd_last_warning = jiffies;
+
+ return -1;
+}
+
+/**
+ * gfs2_consist_i - Flag a filesystem consistency error and withdraw
+ * Returns: -1 if this call withdrew the machine,
+ * 0 if it was already withdrawn
+ */
+
+int gfs2_consist_i(struct gfs2_sbd *sdp, int cluster_wide, const char *function,
+ char *file, unsigned int line)
+{
+ int rv;
+ rv = gfs2_lm_withdraw(sdp,
+ "GFS2: fsid=%s: fatal: filesystem consistency error\n"
+ "GFS2: fsid=%s: function = %s, file = %s, line = %u\n",
+ sdp->sd_fsname,
+ sdp->sd_fsname, function, file, line);
+ return rv;
+}
+
+/**
+ * gfs2_consist_inode_i - Flag an inode consistency error and withdraw
+ * Returns: -1 if this call withdrew the machine,
+ * 0 if it was already withdrawn
+ */
+
+int gfs2_consist_inode_i(struct gfs2_inode *ip, int cluster_wide,
+ const char *function, char *file, unsigned int line)
+{
+ struct gfs2_sbd *sdp = ip->i_sbd;
+ int rv;
+ rv = gfs2_lm_withdraw(sdp,
+ "GFS2: fsid=%s: fatal: filesystem consistency error\n"
+ "GFS2: fsid=%s: inode = %llu %llu\n"
+ "GFS2: fsid=%s: function = %s, file = %s, line = %u\n",
+ sdp->sd_fsname,
+ sdp->sd_fsname, ip->i_num.no_formal_ino, ip->i_num.no_addr,
+ sdp->sd_fsname, function, file, line);
+ return rv;
+}
+
+/**
+ * gfs2_consist_rgrpd_i - Flag a RG consistency error and withdraw
+ * Returns: -1 if this call withdrew the machine,
+ * 0 if it was already withdrawn
+ */
+
+int gfs2_consist_rgrpd_i(struct gfs2_rgrpd *rgd, int cluster_wide,
+ const char *function, char *file, unsigned int line)
+{
+ struct gfs2_sbd *sdp = rgd->rd_sbd;
+ int rv;
+ rv = gfs2_lm_withdraw(sdp,
+ "GFS2: fsid=%s: fatal: filesystem consistency error\n"
+ "GFS2: fsid=%s: RG = %llu\n"
+ "GFS2: fsid=%s: function = %s, file = %s, line = %u\n",
+ sdp->sd_fsname,
+ sdp->sd_fsname, rgd->rd_ri.ri_addr,
+ sdp->sd_fsname, function, file, line);
+ return rv;
+}
+
+/**
+ * gfs2_meta_check_ii - Flag a magic number consistency error and withdraw
+ * Returns: -1 if this call withdrew the machine,
+ * -2 if it was already withdrawn
+ */
+
+int gfs2_meta_check_ii(struct gfs2_sbd *sdp, struct buffer_head *bh,
+ const char *type, const char *function, char *file,
+ unsigned int line)
+{
+ int me;
+ me = gfs2_lm_withdraw(sdp,
+ "GFS2: fsid=%s: fatal: invalid metadata block\n"
+ "GFS2: fsid=%s: bh = %llu (%s)\n"
+ "GFS2: fsid=%s: function = %s, file = %s, line = %u\n",
+ sdp->sd_fsname,
+ sdp->sd_fsname, (uint64_t)bh->b_blocknr, type,
+ sdp->sd_fsname, function, file, line);
+ return (me) ? -1 : -2;
+}
+
+/**
+ * gfs2_metatype_check_ii - Flag a metadata type consistency error and withdraw
+ * Returns: -1 if this call withdrew the machine,
+ * -2 if it was already withdrawn
+ */
+
+int gfs2_metatype_check_ii(struct gfs2_sbd *sdp, struct buffer_head *bh,
+ uint16_t type, uint16_t t, const char *function,
+ char *file, unsigned int line)
+{
+ int me;
+ me = gfs2_lm_withdraw(sdp,
+ "GFS2: fsid=%s: fatal: invalid metadata block\n"
+ "GFS2: fsid=%s: bh = %llu (type: exp=%u, found=%u)\n"
+ "GFS2: fsid=%s: function = %s, file = %s, line = %u\n",
+ sdp->sd_fsname,
+ sdp->sd_fsname, (uint64_t)bh->b_blocknr, type, t,
+ sdp->sd_fsname, function, file, line);
+ return (me) ? -1 : -2;
+}
+
+/**
+ * gfs2_io_error_i - Flag an I/O error and withdraw
+ * Returns: -1 if this call withdrew the machine,
+ * 0 if it was already withdrawn
+ */
+
+int gfs2_io_error_i(struct gfs2_sbd *sdp, const char *function, char *file,
+ unsigned int line)
+{
+ int rv;
+ rv = gfs2_lm_withdraw(sdp,
+ "GFS2: fsid=%s: fatal: I/O error\n"
+ "GFS2: fsid=%s: function = %s, file = %s, line = %u\n",
+ sdp->sd_fsname,
+ sdp->sd_fsname, function, file, line);
+ return rv;
+}
+
+/**
+ * gfs2_io_error_bh_i - Flag a buffer I/O error and withdraw
+ * Returns: -1 if this call withdrew the machine,
+ * 0 if it was already withdrawn
+ */
+
+int gfs2_io_error_bh_i(struct gfs2_sbd *sdp, struct buffer_head *bh,
+ const char *function, char *file, unsigned int line)
+{
+ int rv;
+ rv = gfs2_lm_withdraw(sdp,
+ "GFS2: fsid=%s: fatal: I/O error\n"
+ "GFS2: fsid=%s: block = %llu\n"
+ "GFS2: fsid=%s: function = %s, file = %s, line = %u\n",
+ sdp->sd_fsname,
+ sdp->sd_fsname, (uint64_t)bh->b_blocknr,
+ sdp->sd_fsname, function, file, line);
+ return rv;
+}
+
+/**
+ * gfs2_add_bh_to_ub - copy a buffer up to user space
+ * @ub: the structure representing where to copy
+ * @bh: the buffer
+ *
+ * Returns: errno
+ */
+
+int gfs2_add_bh_to_ub(struct gfs2_user_buffer *ub, struct buffer_head *bh)
+{
+ uint64_t blkno = bh->b_blocknr;
+
+ if (ub->ub_count + sizeof(uint64_t) + bh->b_size > ub->ub_size)
+ return -ENOMEM;
+
+ if (copy_to_user(ub->ub_data + ub->ub_count,
+ &blkno,
+ sizeof(uint64_t)))
+ return -EFAULT;
+ ub->ub_count += sizeof(uint64_t);
+
+ if (copy_to_user(ub->ub_data + ub->ub_count,
+ bh->b_data,
+ bh->b_size))
+ return -EFAULT;
+ ub->ub_count += bh->b_size;
+
+ return 0;
+}
+
+void gfs2_icbit_munge(struct gfs2_sbd *sdp, unsigned char **bitmap,
+ unsigned int bit, int new_value)
+{
+ unsigned int c, o, b = bit;
+ int old_value;
+
+ c = b / (8 * PAGE_SIZE);
+ b %= 8 * PAGE_SIZE;
+ o = b / 8;
+ b %= 8;
+
+ old_value = (bitmap[c][o] & (1 << b));
+ gfs2_assert_withdraw(sdp, !old_value != !new_value);
+
+ if (new_value)
+ bitmap[c][o] |= 1 << b;
+ else
+ bitmap[c][o] &= ~(1 << b);
+}
+
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