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@@ -0,0 +1,453 @@
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+/*
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+ * Copyright (c) 2000-2006 Silicon Graphics, Inc.
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+ * All Rights Reserved.
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+ *
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+ * This program is free software; you can redistribute it and/or
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+ * modify it under the terms of the GNU General Public License as
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+ * published by the Free Software Foundation.
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+ *
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+ * This program is distributed in the hope that it would be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ *
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+ * You should have received a copy of the GNU General Public License
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+ * along with this program; if not, write the Free Software Foundation,
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+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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+ */
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+#include "xfs.h"
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+#include "xfs_fs.h"
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+#include "xfs_format.h"
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+#include "xfs_log.h"
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+#include "xfs_trans.h"
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+#include "xfs_sb.h"
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+#include "xfs_ag.h"
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+#include "xfs_mount.h"
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+#include "xfs_bmap_btree.h"
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+#include "xfs_ialloc_btree.h"
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+#include "xfs_dinode.h"
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+#include "xfs_inode.h"
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+#include "xfs_error.h"
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+#include "xfs_cksum.h"
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+#include "xfs_icache.h"
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+#include "xfs_ialloc.h"
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+
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+/*
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+ * Check that none of the inode's in the buffer have a next
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+ * unlinked field of 0.
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+ */
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+#if defined(DEBUG)
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+void
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+xfs_inobp_check(
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+ xfs_mount_t *mp,
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+ xfs_buf_t *bp)
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+{
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+ int i;
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+ int j;
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+ xfs_dinode_t *dip;
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+
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+ j = mp->m_inode_cluster_size >> mp->m_sb.sb_inodelog;
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+
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+ for (i = 0; i < j; i++) {
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+ dip = (xfs_dinode_t *)xfs_buf_offset(bp,
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+ i * mp->m_sb.sb_inodesize);
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+ if (!dip->di_next_unlinked) {
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+ xfs_alert(mp,
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+ "Detected bogus zero next_unlinked field in incore inode buffer 0x%p.",
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+ bp);
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+ ASSERT(dip->di_next_unlinked);
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+ }
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+ }
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+}
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+#endif
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+
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+static void
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+xfs_inode_buf_verify(
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+ struct xfs_buf *bp)
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+{
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+ struct xfs_mount *mp = bp->b_target->bt_mount;
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+ int i;
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+ int ni;
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+
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+ /*
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+ * Validate the magic number and version of every inode in the buffer
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+ */
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+ ni = XFS_BB_TO_FSB(mp, bp->b_length) * mp->m_sb.sb_inopblock;
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+ for (i = 0; i < ni; i++) {
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+ int di_ok;
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+ xfs_dinode_t *dip;
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+
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+ dip = (struct xfs_dinode *)xfs_buf_offset(bp,
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+ (i << mp->m_sb.sb_inodelog));
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+ di_ok = dip->di_magic == cpu_to_be16(XFS_DINODE_MAGIC) &&
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+ XFS_DINODE_GOOD_VERSION(dip->di_version);
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+ if (unlikely(XFS_TEST_ERROR(!di_ok, mp,
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+ XFS_ERRTAG_ITOBP_INOTOBP,
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+ XFS_RANDOM_ITOBP_INOTOBP))) {
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+ xfs_buf_ioerror(bp, EFSCORRUPTED);
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+ XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_HIGH,
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+ mp, dip);
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+#ifdef DEBUG
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+ xfs_emerg(mp,
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+ "bad inode magic/vsn daddr %lld #%d (magic=%x)",
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+ (unsigned long long)bp->b_bn, i,
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+ be16_to_cpu(dip->di_magic));
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+ ASSERT(0);
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+#endif
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+ }
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+ }
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+ xfs_inobp_check(mp, bp);
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+}
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+
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+
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+static void
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+xfs_inode_buf_read_verify(
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+ struct xfs_buf *bp)
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+{
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+ xfs_inode_buf_verify(bp);
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+}
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+
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+static void
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+xfs_inode_buf_write_verify(
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+ struct xfs_buf *bp)
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+{
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+ xfs_inode_buf_verify(bp);
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+}
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+
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+const struct xfs_buf_ops xfs_inode_buf_ops = {
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+ .verify_read = xfs_inode_buf_read_verify,
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+ .verify_write = xfs_inode_buf_write_verify,
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+};
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+
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+
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+/*
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+ * This routine is called to map an inode to the buffer containing the on-disk
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+ * version of the inode. It returns a pointer to the buffer containing the
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+ * on-disk inode in the bpp parameter, and in the dipp parameter it returns a
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+ * pointer to the on-disk inode within that buffer.
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+ *
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+ * If a non-zero error is returned, then the contents of bpp and dipp are
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+ * undefined.
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+ */
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+int
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+xfs_imap_to_bp(
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+ struct xfs_mount *mp,
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+ struct xfs_trans *tp,
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+ struct xfs_imap *imap,
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+ struct xfs_dinode **dipp,
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+ struct xfs_buf **bpp,
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+ uint buf_flags,
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+ uint iget_flags)
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+{
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+ struct xfs_buf *bp;
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+ int error;
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+
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+ buf_flags |= XBF_UNMAPPED;
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+ error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp, imap->im_blkno,
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+ (int)imap->im_len, buf_flags, &bp,
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+ &xfs_inode_buf_ops);
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+ if (error) {
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+ if (error == EAGAIN) {
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+ ASSERT(buf_flags & XBF_TRYLOCK);
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+ return error;
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+ }
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+
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+ if (error == EFSCORRUPTED &&
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+ (iget_flags & XFS_IGET_UNTRUSTED))
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+ return XFS_ERROR(EINVAL);
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+
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+ xfs_warn(mp, "%s: xfs_trans_read_buf() returned error %d.",
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+ __func__, error);
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+ return error;
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+ }
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+
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+ *bpp = bp;
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+ *dipp = (struct xfs_dinode *)xfs_buf_offset(bp, imap->im_boffset);
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+ return 0;
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+}
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+
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+STATIC void
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+xfs_dinode_from_disk(
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+ xfs_icdinode_t *to,
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+ xfs_dinode_t *from)
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+{
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+ to->di_magic = be16_to_cpu(from->di_magic);
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+ to->di_mode = be16_to_cpu(from->di_mode);
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+ to->di_version = from ->di_version;
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+ to->di_format = from->di_format;
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+ to->di_onlink = be16_to_cpu(from->di_onlink);
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+ to->di_uid = be32_to_cpu(from->di_uid);
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+ to->di_gid = be32_to_cpu(from->di_gid);
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+ to->di_nlink = be32_to_cpu(from->di_nlink);
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+ to->di_projid_lo = be16_to_cpu(from->di_projid_lo);
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+ to->di_projid_hi = be16_to_cpu(from->di_projid_hi);
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+ memcpy(to->di_pad, from->di_pad, sizeof(to->di_pad));
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+ to->di_flushiter = be16_to_cpu(from->di_flushiter);
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+ to->di_atime.t_sec = be32_to_cpu(from->di_atime.t_sec);
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+ to->di_atime.t_nsec = be32_to_cpu(from->di_atime.t_nsec);
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+ to->di_mtime.t_sec = be32_to_cpu(from->di_mtime.t_sec);
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+ to->di_mtime.t_nsec = be32_to_cpu(from->di_mtime.t_nsec);
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+ to->di_ctime.t_sec = be32_to_cpu(from->di_ctime.t_sec);
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+ to->di_ctime.t_nsec = be32_to_cpu(from->di_ctime.t_nsec);
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+ to->di_size = be64_to_cpu(from->di_size);
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+ to->di_nblocks = be64_to_cpu(from->di_nblocks);
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+ to->di_extsize = be32_to_cpu(from->di_extsize);
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+ to->di_nextents = be32_to_cpu(from->di_nextents);
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+ to->di_anextents = be16_to_cpu(from->di_anextents);
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+ to->di_forkoff = from->di_forkoff;
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+ to->di_aformat = from->di_aformat;
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+ to->di_dmevmask = be32_to_cpu(from->di_dmevmask);
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+ to->di_dmstate = be16_to_cpu(from->di_dmstate);
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+ to->di_flags = be16_to_cpu(from->di_flags);
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+ to->di_gen = be32_to_cpu(from->di_gen);
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+
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+ if (to->di_version == 3) {
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+ to->di_changecount = be64_to_cpu(from->di_changecount);
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+ to->di_crtime.t_sec = be32_to_cpu(from->di_crtime.t_sec);
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+ to->di_crtime.t_nsec = be32_to_cpu(from->di_crtime.t_nsec);
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+ to->di_flags2 = be64_to_cpu(from->di_flags2);
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+ to->di_ino = be64_to_cpu(from->di_ino);
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+ to->di_lsn = be64_to_cpu(from->di_lsn);
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+ memcpy(to->di_pad2, from->di_pad2, sizeof(to->di_pad2));
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+ uuid_copy(&to->di_uuid, &from->di_uuid);
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+ }
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+}
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+
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+void
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+xfs_dinode_to_disk(
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+ xfs_dinode_t *to,
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+ xfs_icdinode_t *from)
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+{
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+ to->di_magic = cpu_to_be16(from->di_magic);
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+ to->di_mode = cpu_to_be16(from->di_mode);
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+ to->di_version = from ->di_version;
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+ to->di_format = from->di_format;
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+ to->di_onlink = cpu_to_be16(from->di_onlink);
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+ to->di_uid = cpu_to_be32(from->di_uid);
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+ to->di_gid = cpu_to_be32(from->di_gid);
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+ to->di_nlink = cpu_to_be32(from->di_nlink);
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+ to->di_projid_lo = cpu_to_be16(from->di_projid_lo);
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+ to->di_projid_hi = cpu_to_be16(from->di_projid_hi);
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+ memcpy(to->di_pad, from->di_pad, sizeof(to->di_pad));
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+ to->di_atime.t_sec = cpu_to_be32(from->di_atime.t_sec);
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+ to->di_atime.t_nsec = cpu_to_be32(from->di_atime.t_nsec);
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+ to->di_mtime.t_sec = cpu_to_be32(from->di_mtime.t_sec);
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+ to->di_mtime.t_nsec = cpu_to_be32(from->di_mtime.t_nsec);
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+ to->di_ctime.t_sec = cpu_to_be32(from->di_ctime.t_sec);
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+ to->di_ctime.t_nsec = cpu_to_be32(from->di_ctime.t_nsec);
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+ to->di_size = cpu_to_be64(from->di_size);
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+ to->di_nblocks = cpu_to_be64(from->di_nblocks);
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+ to->di_extsize = cpu_to_be32(from->di_extsize);
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+ to->di_nextents = cpu_to_be32(from->di_nextents);
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+ to->di_anextents = cpu_to_be16(from->di_anextents);
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+ to->di_forkoff = from->di_forkoff;
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+ to->di_aformat = from->di_aformat;
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+ to->di_dmevmask = cpu_to_be32(from->di_dmevmask);
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+ to->di_dmstate = cpu_to_be16(from->di_dmstate);
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+ to->di_flags = cpu_to_be16(from->di_flags);
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+ to->di_gen = cpu_to_be32(from->di_gen);
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+
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+ if (from->di_version == 3) {
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+ to->di_changecount = cpu_to_be64(from->di_changecount);
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+ to->di_crtime.t_sec = cpu_to_be32(from->di_crtime.t_sec);
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+ to->di_crtime.t_nsec = cpu_to_be32(from->di_crtime.t_nsec);
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+ to->di_flags2 = cpu_to_be64(from->di_flags2);
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+ to->di_ino = cpu_to_be64(from->di_ino);
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+ to->di_lsn = cpu_to_be64(from->di_lsn);
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+ memcpy(to->di_pad2, from->di_pad2, sizeof(to->di_pad2));
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+ uuid_copy(&to->di_uuid, &from->di_uuid);
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+ to->di_flushiter = 0;
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+ } else {
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+ to->di_flushiter = cpu_to_be16(from->di_flushiter);
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+ }
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+}
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+
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+static bool
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+xfs_dinode_verify(
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+ struct xfs_mount *mp,
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+ struct xfs_inode *ip,
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+ struct xfs_dinode *dip)
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+{
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+ if (dip->di_magic != cpu_to_be16(XFS_DINODE_MAGIC))
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+ return false;
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+
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+ /* only version 3 or greater inodes are extensively verified here */
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+ if (dip->di_version < 3)
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+ return true;
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+
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+ if (!xfs_sb_version_hascrc(&mp->m_sb))
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+ return false;
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+ if (!xfs_verify_cksum((char *)dip, mp->m_sb.sb_inodesize,
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+ offsetof(struct xfs_dinode, di_crc)))
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+ return false;
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+ if (be64_to_cpu(dip->di_ino) != ip->i_ino)
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+ return false;
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+ if (!uuid_equal(&dip->di_uuid, &mp->m_sb.sb_uuid))
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+ return false;
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+ return true;
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+}
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+
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+void
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+xfs_dinode_calc_crc(
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+ struct xfs_mount *mp,
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+ struct xfs_dinode *dip)
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+{
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+ __uint32_t crc;
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+
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+ if (dip->di_version < 3)
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+ return;
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+
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+ ASSERT(xfs_sb_version_hascrc(&mp->m_sb));
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+ crc = xfs_start_cksum((char *)dip, mp->m_sb.sb_inodesize,
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+ offsetof(struct xfs_dinode, di_crc));
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+ dip->di_crc = xfs_end_cksum(crc);
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+}
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+
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+/*
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+ * Read the disk inode attributes into the in-core inode structure.
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+ *
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+ * For version 5 superblocks, if we are initialising a new inode and we are not
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+ * utilising the XFS_MOUNT_IKEEP inode cluster mode, we can simple build the new
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+ * inode core with a random generation number. If we are keeping inodes around,
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+ * we need to read the inode cluster to get the existing generation number off
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+ * disk. Further, if we are using version 4 superblocks (i.e. v1/v2 inode
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+ * format) then log recovery is dependent on the di_flushiter field being
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+ * initialised from the current on-disk value and hence we must also read the
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+ * inode off disk.
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+ */
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+int
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+xfs_iread(
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+ xfs_mount_t *mp,
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+ xfs_trans_t *tp,
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+ xfs_inode_t *ip,
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+ uint iget_flags)
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+{
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+ xfs_buf_t *bp;
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+ xfs_dinode_t *dip;
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+ int error;
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+
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+ /*
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+ * Fill in the location information in the in-core inode.
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+ */
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+ error = xfs_imap(mp, tp, ip->i_ino, &ip->i_imap, iget_flags);
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+ if (error)
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+ return error;
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+
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+ /* shortcut IO on inode allocation if possible */
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+ if ((iget_flags & XFS_IGET_CREATE) &&
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+ xfs_sb_version_hascrc(&mp->m_sb) &&
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+ !(mp->m_flags & XFS_MOUNT_IKEEP)) {
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+ /* initialise the on-disk inode core */
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+ memset(&ip->i_d, 0, sizeof(ip->i_d));
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+ ip->i_d.di_magic = XFS_DINODE_MAGIC;
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+ ip->i_d.di_gen = prandom_u32();
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+ if (xfs_sb_version_hascrc(&mp->m_sb)) {
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+ ip->i_d.di_version = 3;
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+ ip->i_d.di_ino = ip->i_ino;
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+ uuid_copy(&ip->i_d.di_uuid, &mp->m_sb.sb_uuid);
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+ } else
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+ ip->i_d.di_version = 2;
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+ return 0;
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+ }
|
|
|
+
|
|
|
+ /*
|
|
|
+ * Get pointers to the on-disk inode and the buffer containing it.
|
|
|
+ */
|
|
|
+ error = xfs_imap_to_bp(mp, tp, &ip->i_imap, &dip, &bp, 0, iget_flags);
|
|
|
+ if (error)
|
|
|
+ return error;
|
|
|
+
|
|
|
+ /* even unallocated inodes are verified */
|
|
|
+ if (!xfs_dinode_verify(mp, ip, dip)) {
|
|
|
+ xfs_alert(mp, "%s: validation failed for inode %lld failed",
|
|
|
+ __func__, ip->i_ino);
|
|
|
+
|
|
|
+ XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp, dip);
|
|
|
+ error = XFS_ERROR(EFSCORRUPTED);
|
|
|
+ goto out_brelse;
|
|
|
+ }
|
|
|
+
|
|
|
+ /*
|
|
|
+ * If the on-disk inode is already linked to a directory
|
|
|
+ * entry, copy all of the inode into the in-core inode.
|
|
|
+ * xfs_iformat_fork() handles copying in the inode format
|
|
|
+ * specific information.
|
|
|
+ * Otherwise, just get the truly permanent information.
|
|
|
+ */
|
|
|
+ if (dip->di_mode) {
|
|
|
+ xfs_dinode_from_disk(&ip->i_d, dip);
|
|
|
+ error = xfs_iformat_fork(ip, dip);
|
|
|
+ if (error) {
|
|
|
+#ifdef DEBUG
|
|
|
+ xfs_alert(mp, "%s: xfs_iformat() returned error %d",
|
|
|
+ __func__, error);
|
|
|
+#endif /* DEBUG */
|
|
|
+ goto out_brelse;
|
|
|
+ }
|
|
|
+ } else {
|
|
|
+ /*
|
|
|
+ * Partial initialisation of the in-core inode. Just the bits
|
|
|
+ * that xfs_ialloc won't overwrite or relies on being correct.
|
|
|
+ */
|
|
|
+ ip->i_d.di_magic = be16_to_cpu(dip->di_magic);
|
|
|
+ ip->i_d.di_version = dip->di_version;
|
|
|
+ ip->i_d.di_gen = be32_to_cpu(dip->di_gen);
|
|
|
+ ip->i_d.di_flushiter = be16_to_cpu(dip->di_flushiter);
|
|
|
+
|
|
|
+ if (dip->di_version == 3) {
|
|
|
+ ip->i_d.di_ino = be64_to_cpu(dip->di_ino);
|
|
|
+ uuid_copy(&ip->i_d.di_uuid, &dip->di_uuid);
|
|
|
+ }
|
|
|
+
|
|
|
+ /*
|
|
|
+ * Make sure to pull in the mode here as well in
|
|
|
+ * case the inode is released without being used.
|
|
|
+ * This ensures that xfs_inactive() will see that
|
|
|
+ * the inode is already free and not try to mess
|
|
|
+ * with the uninitialized part of it.
|
|
|
+ */
|
|
|
+ ip->i_d.di_mode = 0;
|
|
|
+ }
|
|
|
+
|
|
|
+ /*
|
|
|
+ * The inode format changed when we moved the link count and
|
|
|
+ * made it 32 bits long. If this is an old format inode,
|
|
|
+ * convert it in memory to look like a new one. If it gets
|
|
|
+ * flushed to disk we will convert back before flushing or
|
|
|
+ * logging it. We zero out the new projid field and the old link
|
|
|
+ * count field. We'll handle clearing the pad field (the remains
|
|
|
+ * of the old uuid field) when we actually convert the inode to
|
|
|
+ * the new format. We don't change the version number so that we
|
|
|
+ * can distinguish this from a real new format inode.
|
|
|
+ */
|
|
|
+ if (ip->i_d.di_version == 1) {
|
|
|
+ ip->i_d.di_nlink = ip->i_d.di_onlink;
|
|
|
+ ip->i_d.di_onlink = 0;
|
|
|
+ xfs_set_projid(ip, 0);
|
|
|
+ }
|
|
|
+
|
|
|
+ ip->i_delayed_blks = 0;
|
|
|
+
|
|
|
+ /*
|
|
|
+ * Mark the buffer containing the inode as something to keep
|
|
|
+ * around for a while. This helps to keep recently accessed
|
|
|
+ * meta-data in-core longer.
|
|
|
+ */
|
|
|
+ xfs_buf_set_ref(bp, XFS_INO_REF);
|
|
|
+
|
|
|
+ /*
|
|
|
+ * Use xfs_trans_brelse() to release the buffer containing the on-disk
|
|
|
+ * inode, because it was acquired with xfs_trans_read_buf() in
|
|
|
+ * xfs_imap_to_bp() above. If tp is NULL, this is just a normal
|
|
|
+ * brelse(). If we're within a transaction, then xfs_trans_brelse()
|
|
|
+ * will only release the buffer if it is not dirty within the
|
|
|
+ * transaction. It will be OK to release the buffer in this case,
|
|
|
+ * because inodes on disk are never destroyed and we will be locking the
|
|
|
+ * new in-core inode before putting it in the cache where other
|
|
|
+ * processes can find it. Thus we don't have to worry about the inode
|
|
|
+ * being changed just because we released the buffer.
|
|
|
+ */
|
|
|
+ out_brelse:
|
|
|
+ xfs_trans_brelse(tp, bp);
|
|
|
+ return error;
|
|
|
+}
|
Dave Chinner