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***** SUSPECTED SPAM ***** [PATCH 14/50] xfs: introduce xfs_inode_buf.c

To: xfs@xxxxxxxxxxx
Subject: ***** SUSPECTED SPAM ***** [PATCH 14/50] xfs: introduce xfs_inode_buf.c for inode buffer operations
From: Dave Chinner <david@xxxxxxxxxxxxx>
Date: Mon, 12 Aug 2013 20:49:35 +1000
Delivered-to: xfs@xxxxxxxxxxx
Importance: Low
In-reply-to: <1376304611-22994-1-git-send-email-david@xxxxxxxxxxxxx>
References: <1376304611-22994-1-git-send-email-david@xxxxxxxxxxxxx>
From: Dave Chinner <dchinner@xxxxxxxxxx>

The only thing remaining in xfs_inode.[ch] are the operations that
read, write or verify physical inodes in their underlying buffers.
Move all this code to xfs_inode_buf.[ch] and so we can stop sharing
xfs_inode.[ch] with userspace.

Signed-off-by: Dave Chinner <dchinner@xxxxxxxxxx>
Reviewed-by: Brian Foster <bfoster@xxxxxxxxxx>
---
 fs/xfs/Makefile        |   1 +
 fs/xfs/xfs_inode.c     | 420 ---------------------------------------------
 fs/xfs/xfs_inode.h     |  41 +----
 fs/xfs/xfs_inode_buf.c | 453 +++++++++++++++++++++++++++++++++++++++++++++++++
 fs/xfs/xfs_inode_buf.h |  53 ++++++
 5 files changed, 514 insertions(+), 454 deletions(-)
 create mode 100644 fs/xfs/xfs_inode_buf.c
 create mode 100644 fs/xfs/xfs_inode_buf.h

diff --git a/fs/xfs/Makefile b/fs/xfs/Makefile
index ce0b87e..7f2319d 100644
--- a/fs/xfs/Makefile
+++ b/fs/xfs/Makefile
@@ -75,6 +75,7 @@ xfs-y                         += xfs_alloc.o \
                                   xfs_icreate_item.o \
                                   xfs_inode.o \
                                   xfs_inode_fork.o \
+                                  xfs_inode_buf.o \
                                   xfs_log_recover.o \
                                   xfs_mount.o \
                                   xfs_symlink.o \
diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
index 18308ac..fcda5b3 100644
--- a/fs/xfs/xfs_inode.c
+++ b/fs/xfs/xfs_inode.c
@@ -322,236 +322,6 @@ __xfs_iflock(
        finish_wait(wq, &wait.wait);
 }
 
-/*
- * Check that none of the inode's in the buffer have a next
- * unlinked field of 0.
- */
-#if defined(DEBUG)
-void
-xfs_inobp_check(
-       xfs_mount_t     *mp,
-       xfs_buf_t       *bp)
-{
-       int             i;
-       int             j;
-       xfs_dinode_t    *dip;
-
-       j = mp->m_inode_cluster_size >> mp->m_sb.sb_inodelog;
-
-       for (i = 0; i < j; i++) {
-               dip = (xfs_dinode_t *)xfs_buf_offset(bp,
-                                       i * mp->m_sb.sb_inodesize);
-               if (!dip->di_next_unlinked)  {
-                       xfs_alert(mp,
-       "Detected bogus zero next_unlinked field in incore inode buffer 0x%p.",
-                               bp);
-                       ASSERT(dip->di_next_unlinked);
-               }
-       }
-}
-#endif
-
-static void
-xfs_inode_buf_verify(
-       struct xfs_buf  *bp)
-{
-       struct xfs_mount *mp = bp->b_target->bt_mount;
-       int             i;
-       int             ni;
-
-       /*
-        * Validate the magic number and version of every inode in the buffer
-        */
-       ni = XFS_BB_TO_FSB(mp, bp->b_length) * mp->m_sb.sb_inopblock;
-       for (i = 0; i < ni; i++) {
-               int             di_ok;
-               xfs_dinode_t    *dip;
-
-               dip = (struct xfs_dinode *)xfs_buf_offset(bp,
-                                       (i << mp->m_sb.sb_inodelog));
-               di_ok = dip->di_magic == cpu_to_be16(XFS_DINODE_MAGIC) &&
-                           XFS_DINODE_GOOD_VERSION(dip->di_version);
-               if (unlikely(XFS_TEST_ERROR(!di_ok, mp,
-                                               XFS_ERRTAG_ITOBP_INOTOBP,
-                                               XFS_RANDOM_ITOBP_INOTOBP))) {
-                       xfs_buf_ioerror(bp, EFSCORRUPTED);
-                       XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_HIGH,
-                                            mp, dip);
-#ifdef DEBUG
-                       xfs_emerg(mp,
-                               "bad inode magic/vsn daddr %lld #%d (magic=%x)",
-                               (unsigned long long)bp->b_bn, i,
-                               be16_to_cpu(dip->di_magic));
-                       ASSERT(0);
-#endif
-               }
-       }
-       xfs_inobp_check(mp, bp);
-}
-
-
-static void
-xfs_inode_buf_read_verify(
-       struct xfs_buf  *bp)
-{
-       xfs_inode_buf_verify(bp);
-}
-
-static void
-xfs_inode_buf_write_verify(
-       struct xfs_buf  *bp)
-{
-       xfs_inode_buf_verify(bp);
-}
-
-const struct xfs_buf_ops xfs_inode_buf_ops = {
-       .verify_read = xfs_inode_buf_read_verify,
-       .verify_write = xfs_inode_buf_write_verify,
-};
-
-
-/*
- * This routine is called to map an inode to the buffer containing the on-disk
- * version of the inode.  It returns a pointer to the buffer containing the
- * on-disk inode in the bpp parameter, and in the dipp parameter it returns a
- * pointer to the on-disk inode within that buffer.
- *
- * If a non-zero error is returned, then the contents of bpp and dipp are
- * undefined.
- */
-int
-xfs_imap_to_bp(
-       struct xfs_mount        *mp,
-       struct xfs_trans        *tp,
-       struct xfs_imap         *imap,
-       struct xfs_dinode       **dipp,
-       struct xfs_buf          **bpp,
-       uint                    buf_flags,
-       uint                    iget_flags)
-{
-       struct xfs_buf          *bp;
-       int                     error;
-
-       buf_flags |= XBF_UNMAPPED;
-       error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp, imap->im_blkno,
-                                  (int)imap->im_len, buf_flags, &bp,
-                                  &xfs_inode_buf_ops);
-       if (error) {
-               if (error == EAGAIN) {
-                       ASSERT(buf_flags & XBF_TRYLOCK);
-                       return error;
-               }
-
-               if (error == EFSCORRUPTED &&
-                   (iget_flags & XFS_IGET_UNTRUSTED))
-                       return XFS_ERROR(EINVAL);
-
-               xfs_warn(mp, "%s: xfs_trans_read_buf() returned error %d.",
-                       __func__, error);
-               return error;
-       }
-
-       *bpp = bp;
-       *dipp = (struct xfs_dinode *)xfs_buf_offset(bp, imap->im_boffset);
-       return 0;
-}
-
-STATIC void
-xfs_dinode_from_disk(
-       xfs_icdinode_t          *to,
-       xfs_dinode_t            *from)
-{
-       to->di_magic = be16_to_cpu(from->di_magic);
-       to->di_mode = be16_to_cpu(from->di_mode);
-       to->di_version = from ->di_version;
-       to->di_format = from->di_format;
-       to->di_onlink = be16_to_cpu(from->di_onlink);
-       to->di_uid = be32_to_cpu(from->di_uid);
-       to->di_gid = be32_to_cpu(from->di_gid);
-       to->di_nlink = be32_to_cpu(from->di_nlink);
-       to->di_projid_lo = be16_to_cpu(from->di_projid_lo);
-       to->di_projid_hi = be16_to_cpu(from->di_projid_hi);
-       memcpy(to->di_pad, from->di_pad, sizeof(to->di_pad));
-       to->di_flushiter = be16_to_cpu(from->di_flushiter);
-       to->di_atime.t_sec = be32_to_cpu(from->di_atime.t_sec);
-       to->di_atime.t_nsec = be32_to_cpu(from->di_atime.t_nsec);
-       to->di_mtime.t_sec = be32_to_cpu(from->di_mtime.t_sec);
-       to->di_mtime.t_nsec = be32_to_cpu(from->di_mtime.t_nsec);
-       to->di_ctime.t_sec = be32_to_cpu(from->di_ctime.t_sec);
-       to->di_ctime.t_nsec = be32_to_cpu(from->di_ctime.t_nsec);
-       to->di_size = be64_to_cpu(from->di_size);
-       to->di_nblocks = be64_to_cpu(from->di_nblocks);
-       to->di_extsize = be32_to_cpu(from->di_extsize);
-       to->di_nextents = be32_to_cpu(from->di_nextents);
-       to->di_anextents = be16_to_cpu(from->di_anextents);
-       to->di_forkoff = from->di_forkoff;
-       to->di_aformat  = from->di_aformat;
-       to->di_dmevmask = be32_to_cpu(from->di_dmevmask);
-       to->di_dmstate  = be16_to_cpu(from->di_dmstate);
-       to->di_flags    = be16_to_cpu(from->di_flags);
-       to->di_gen      = be32_to_cpu(from->di_gen);
-
-       if (to->di_version == 3) {
-               to->di_changecount = be64_to_cpu(from->di_changecount);
-               to->di_crtime.t_sec = be32_to_cpu(from->di_crtime.t_sec);
-               to->di_crtime.t_nsec = be32_to_cpu(from->di_crtime.t_nsec);
-               to->di_flags2 = be64_to_cpu(from->di_flags2);
-               to->di_ino = be64_to_cpu(from->di_ino);
-               to->di_lsn = be64_to_cpu(from->di_lsn);
-               memcpy(to->di_pad2, from->di_pad2, sizeof(to->di_pad2));
-               uuid_copy(&to->di_uuid, &from->di_uuid);
-       }
-}
-
-void
-xfs_dinode_to_disk(
-       xfs_dinode_t            *to,
-       xfs_icdinode_t          *from)
-{
-       to->di_magic = cpu_to_be16(from->di_magic);
-       to->di_mode = cpu_to_be16(from->di_mode);
-       to->di_version = from ->di_version;
-       to->di_format = from->di_format;
-       to->di_onlink = cpu_to_be16(from->di_onlink);
-       to->di_uid = cpu_to_be32(from->di_uid);
-       to->di_gid = cpu_to_be32(from->di_gid);
-       to->di_nlink = cpu_to_be32(from->di_nlink);
-       to->di_projid_lo = cpu_to_be16(from->di_projid_lo);
-       to->di_projid_hi = cpu_to_be16(from->di_projid_hi);
-       memcpy(to->di_pad, from->di_pad, sizeof(to->di_pad));
-       to->di_atime.t_sec = cpu_to_be32(from->di_atime.t_sec);
-       to->di_atime.t_nsec = cpu_to_be32(from->di_atime.t_nsec);
-       to->di_mtime.t_sec = cpu_to_be32(from->di_mtime.t_sec);
-       to->di_mtime.t_nsec = cpu_to_be32(from->di_mtime.t_nsec);
-       to->di_ctime.t_sec = cpu_to_be32(from->di_ctime.t_sec);
-       to->di_ctime.t_nsec = cpu_to_be32(from->di_ctime.t_nsec);
-       to->di_size = cpu_to_be64(from->di_size);
-       to->di_nblocks = cpu_to_be64(from->di_nblocks);
-       to->di_extsize = cpu_to_be32(from->di_extsize);
-       to->di_nextents = cpu_to_be32(from->di_nextents);
-       to->di_anextents = cpu_to_be16(from->di_anextents);
-       to->di_forkoff = from->di_forkoff;
-       to->di_aformat = from->di_aformat;
-       to->di_dmevmask = cpu_to_be32(from->di_dmevmask);
-       to->di_dmstate = cpu_to_be16(from->di_dmstate);
-       to->di_flags = cpu_to_be16(from->di_flags);
-       to->di_gen = cpu_to_be32(from->di_gen);
-
-       if (from->di_version == 3) {
-               to->di_changecount = cpu_to_be64(from->di_changecount);
-               to->di_crtime.t_sec = cpu_to_be32(from->di_crtime.t_sec);
-               to->di_crtime.t_nsec = cpu_to_be32(from->di_crtime.t_nsec);
-               to->di_flags2 = cpu_to_be64(from->di_flags2);
-               to->di_ino = cpu_to_be64(from->di_ino);
-               to->di_lsn = cpu_to_be64(from->di_lsn);
-               memcpy(to->di_pad2, from->di_pad2, sizeof(to->di_pad2));
-               uuid_copy(&to->di_uuid, &from->di_uuid);
-               to->di_flushiter = 0;
-       } else {
-               to->di_flushiter = cpu_to_be16(from->di_flushiter);
-       }
-}
-
 STATIC uint
 _xfs_dic2xflags(
        __uint16_t              di_flags)
@@ -610,196 +380,6 @@ xfs_dic2xflags(
                                (XFS_DFORK_Q(dip) ? XFS_XFLAG_HASATTR : 0);
 }
 
-static bool
-xfs_dinode_verify(
-       struct xfs_mount        *mp,
-       struct xfs_inode        *ip,
-       struct xfs_dinode       *dip)
-{
-       if (dip->di_magic != cpu_to_be16(XFS_DINODE_MAGIC))
-               return false;
-
-       /* only version 3 or greater inodes are extensively verified here */
-       if (dip->di_version < 3)
-               return true;
-
-       if (!xfs_sb_version_hascrc(&mp->m_sb))
-               return false;
-       if (!xfs_verify_cksum((char *)dip, mp->m_sb.sb_inodesize,
-                             offsetof(struct xfs_dinode, di_crc)))
-               return false;
-       if (be64_to_cpu(dip->di_ino) != ip->i_ino)
-               return false;
-       if (!uuid_equal(&dip->di_uuid, &mp->m_sb.sb_uuid))
-               return false;
-       return true;
-}
-
-void
-xfs_dinode_calc_crc(
-       struct xfs_mount        *mp,
-       struct xfs_dinode       *dip)
-{
-       __uint32_t              crc;
-
-       if (dip->di_version < 3)
-               return;
-
-       ASSERT(xfs_sb_version_hascrc(&mp->m_sb));
-       crc = xfs_start_cksum((char *)dip, mp->m_sb.sb_inodesize,
-                             offsetof(struct xfs_dinode, di_crc));
-       dip->di_crc = xfs_end_cksum(crc);
-}
-
-/*
- * Read the disk inode attributes into the in-core inode structure.
- *
- * For version 5 superblocks, if we are initialising a new inode and we are not
- * utilising the XFS_MOUNT_IKEEP inode cluster mode, we can simple build the 
new
- * inode core with a random generation number. If we are keeping inodes around,
- * we need to read the inode cluster to get the existing generation number off
- * disk. Further, if we are using version 4 superblocks (i.e. v1/v2 inode
- * format) then log recovery is dependent on the di_flushiter field being
- * initialised from the current on-disk value and hence we must also read the
- * inode off disk.
- */
-int
-xfs_iread(
-       xfs_mount_t     *mp,
-       xfs_trans_t     *tp,
-       xfs_inode_t     *ip,
-       uint            iget_flags)
-{
-       xfs_buf_t       *bp;
-       xfs_dinode_t    *dip;
-       int             error;
-
-       /*
-        * Fill in the location information in the in-core inode.
-        */
-       error = xfs_imap(mp, tp, ip->i_ino, &ip->i_imap, iget_flags);
-       if (error)
-               return error;
-
-       /* shortcut IO on inode allocation if possible */
-       if ((iget_flags & XFS_IGET_CREATE) &&
-           xfs_sb_version_hascrc(&mp->m_sb) &&
-           !(mp->m_flags & XFS_MOUNT_IKEEP)) {
-               /* initialise the on-disk inode core */
-               memset(&ip->i_d, 0, sizeof(ip->i_d));
-               ip->i_d.di_magic = XFS_DINODE_MAGIC;
-               ip->i_d.di_gen = prandom_u32();
-               if (xfs_sb_version_hascrc(&mp->m_sb)) {
-                       ip->i_d.di_version = 3;
-                       ip->i_d.di_ino = ip->i_ino;
-                       uuid_copy(&ip->i_d.di_uuid, &mp->m_sb.sb_uuid);
-               } else
-                       ip->i_d.di_version = 2;
-               return 0;
-       }
-
-       /*
-        * 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;
-}
-
 /*
  * Allocate an inode on disk and return a copy of its in-core version.
  * The in-core inode is locked exclusively.  Set mode, nlink, and rdev
diff --git a/fs/xfs/xfs_inode.h b/fs/xfs/xfs_inode.h
index 0bd034a..8f775ed 100644
--- a/fs/xfs/xfs_inode.h
+++ b/fs/xfs/xfs_inode.h
@@ -18,24 +18,15 @@
 #ifndef        __XFS_INODE_H__
 #define        __XFS_INODE_H__
 
-struct posix_acl;
-struct xfs_dinode;
-struct xfs_inode;
-
+#include "xfs_inode_buf.h"
 #include "xfs_inode_fork.h"
 
 /*
- * Inode location information.  Stored in the inode and passed to
- * xfs_imap_to_bp() to get a buffer and dinode for a given inode.
+ * Kernel only inode definitions
  */
-struct xfs_imap {
-       xfs_daddr_t     im_blkno;       /* starting BB of inode chunk */
-       ushort          im_len;         /* length in BBs of inode chunk */
-       ushort          im_boffset;     /* inode offset in block in bytes */
-};
-
-#ifdef __KERNEL__
 
+struct xfs_dinode;
+struct xfs_inode;
 struct xfs_buf;
 struct xfs_bmap_free;
 struct xfs_bmbt_irec;
@@ -347,7 +338,10 @@ int                xfs_itruncate_extents(struct xfs_trans 
**, struct xfs_inode *,
 int            xfs_iunlink(struct xfs_trans *, xfs_inode_t *);
 
 void           xfs_iext_realloc(xfs_inode_t *, int, int);
+
 void           xfs_iunpin_wait(xfs_inode_t *);
+#define xfs_ipincount(ip)      ((unsigned int) atomic_read(&ip->i_pincount))
+
 int            xfs_iflush(struct xfs_inode *, struct xfs_buf **);
 void           xfs_lock_inodes(xfs_inode_t **, int, uint);
 void           xfs_lock_two_inodes(xfs_inode_t *, xfs_inode_t *, uint);
@@ -367,27 +361,6 @@ do { \
        iput(VFS_I(ip)); \
 } while (0)
 
-#endif /* __KERNEL__ */
-
-int            xfs_imap_to_bp(struct xfs_mount *, struct xfs_trans *,
-                              struct xfs_imap *, struct xfs_dinode **,
-                              struct xfs_buf **, uint, uint);
-int            xfs_iread(struct xfs_mount *, struct xfs_trans *,
-                         struct xfs_inode *, uint);
-void           xfs_dinode_calc_crc(struct xfs_mount *, struct xfs_dinode *);
-void           xfs_dinode_to_disk(struct xfs_dinode *,
-                                  struct xfs_icdinode *);
-bool           xfs_can_free_eofblocks(struct xfs_inode *, bool);
-
-#define xfs_ipincount(ip)      ((unsigned int) atomic_read(&ip->i_pincount))
-
-#if defined(DEBUG)
-void           xfs_inobp_check(struct xfs_mount *, struct xfs_buf *);
-#else
-#define        xfs_inobp_check(mp, bp)
-#endif /* DEBUG */
-
 extern struct kmem_zone        *xfs_inode_zone;
-extern const struct xfs_buf_ops xfs_inode_buf_ops;
 
 #endif /* __XFS_INODE_H__ */
diff --git a/fs/xfs/xfs_inode_buf.c b/fs/xfs/xfs_inode_buf.c
new file mode 100644
index 0000000..38fe509
--- /dev/null
+++ b/fs/xfs/xfs_inode_buf.c
@@ -0,0 +1,453 @@
+/*
+ * Copyright (c) 2000-2006 Silicon Graphics, Inc.
+ * All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write the Free Software Foundation,
+ * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+#include "xfs.h"
+#include "xfs_fs.h"
+#include "xfs_format.h"
+#include "xfs_log.h"
+#include "xfs_trans.h"
+#include "xfs_sb.h"
+#include "xfs_ag.h"
+#include "xfs_mount.h"
+#include "xfs_bmap_btree.h"
+#include "xfs_ialloc_btree.h"
+#include "xfs_dinode.h"
+#include "xfs_inode.h"
+#include "xfs_error.h"
+#include "xfs_cksum.h"
+#include "xfs_icache.h"
+#include "xfs_ialloc.h"
+
+/*
+ * Check that none of the inode's in the buffer have a next
+ * unlinked field of 0.
+ */
+#if defined(DEBUG)
+void
+xfs_inobp_check(
+       xfs_mount_t     *mp,
+       xfs_buf_t       *bp)
+{
+       int             i;
+       int             j;
+       xfs_dinode_t    *dip;
+
+       j = mp->m_inode_cluster_size >> mp->m_sb.sb_inodelog;
+
+       for (i = 0; i < j; i++) {
+               dip = (xfs_dinode_t *)xfs_buf_offset(bp,
+                                       i * mp->m_sb.sb_inodesize);
+               if (!dip->di_next_unlinked)  {
+                       xfs_alert(mp,
+       "Detected bogus zero next_unlinked field in incore inode buffer 0x%p.",
+                               bp);
+                       ASSERT(dip->di_next_unlinked);
+               }
+       }
+}
+#endif
+
+static void
+xfs_inode_buf_verify(
+       struct xfs_buf  *bp)
+{
+       struct xfs_mount *mp = bp->b_target->bt_mount;
+       int             i;
+       int             ni;
+
+       /*
+        * Validate the magic number and version of every inode in the buffer
+        */
+       ni = XFS_BB_TO_FSB(mp, bp->b_length) * mp->m_sb.sb_inopblock;
+       for (i = 0; i < ni; i++) {
+               int             di_ok;
+               xfs_dinode_t    *dip;
+
+               dip = (struct xfs_dinode *)xfs_buf_offset(bp,
+                                       (i << mp->m_sb.sb_inodelog));
+               di_ok = dip->di_magic == cpu_to_be16(XFS_DINODE_MAGIC) &&
+                           XFS_DINODE_GOOD_VERSION(dip->di_version);
+               if (unlikely(XFS_TEST_ERROR(!di_ok, mp,
+                                               XFS_ERRTAG_ITOBP_INOTOBP,
+                                               XFS_RANDOM_ITOBP_INOTOBP))) {
+                       xfs_buf_ioerror(bp, EFSCORRUPTED);
+                       XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_HIGH,
+                                            mp, dip);
+#ifdef DEBUG
+                       xfs_emerg(mp,
+                               "bad inode magic/vsn daddr %lld #%d (magic=%x)",
+                               (unsigned long long)bp->b_bn, i,
+                               be16_to_cpu(dip->di_magic));
+                       ASSERT(0);
+#endif
+               }
+       }
+       xfs_inobp_check(mp, bp);
+}
+
+
+static void
+xfs_inode_buf_read_verify(
+       struct xfs_buf  *bp)
+{
+       xfs_inode_buf_verify(bp);
+}
+
+static void
+xfs_inode_buf_write_verify(
+       struct xfs_buf  *bp)
+{
+       xfs_inode_buf_verify(bp);
+}
+
+const struct xfs_buf_ops xfs_inode_buf_ops = {
+       .verify_read = xfs_inode_buf_read_verify,
+       .verify_write = xfs_inode_buf_write_verify,
+};
+
+
+/*
+ * This routine is called to map an inode to the buffer containing the on-disk
+ * version of the inode.  It returns a pointer to the buffer containing the
+ * on-disk inode in the bpp parameter, and in the dipp parameter it returns a
+ * pointer to the on-disk inode within that buffer.
+ *
+ * If a non-zero error is returned, then the contents of bpp and dipp are
+ * undefined.
+ */
+int
+xfs_imap_to_bp(
+       struct xfs_mount        *mp,
+       struct xfs_trans        *tp,
+       struct xfs_imap         *imap,
+       struct xfs_dinode       **dipp,
+       struct xfs_buf          **bpp,
+       uint                    buf_flags,
+       uint                    iget_flags)
+{
+       struct xfs_buf          *bp;
+       int                     error;
+
+       buf_flags |= XBF_UNMAPPED;
+       error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp, imap->im_blkno,
+                                  (int)imap->im_len, buf_flags, &bp,
+                                  &xfs_inode_buf_ops);
+       if (error) {
+               if (error == EAGAIN) {
+                       ASSERT(buf_flags & XBF_TRYLOCK);
+                       return error;
+               }
+
+               if (error == EFSCORRUPTED &&
+                   (iget_flags & XFS_IGET_UNTRUSTED))
+                       return XFS_ERROR(EINVAL);
+
+               xfs_warn(mp, "%s: xfs_trans_read_buf() returned error %d.",
+                       __func__, error);
+               return error;
+       }
+
+       *bpp = bp;
+       *dipp = (struct xfs_dinode *)xfs_buf_offset(bp, imap->im_boffset);
+       return 0;
+}
+
+STATIC void
+xfs_dinode_from_disk(
+       xfs_icdinode_t          *to,
+       xfs_dinode_t            *from)
+{
+       to->di_magic = be16_to_cpu(from->di_magic);
+       to->di_mode = be16_to_cpu(from->di_mode);
+       to->di_version = from ->di_version;
+       to->di_format = from->di_format;
+       to->di_onlink = be16_to_cpu(from->di_onlink);
+       to->di_uid = be32_to_cpu(from->di_uid);
+       to->di_gid = be32_to_cpu(from->di_gid);
+       to->di_nlink = be32_to_cpu(from->di_nlink);
+       to->di_projid_lo = be16_to_cpu(from->di_projid_lo);
+       to->di_projid_hi = be16_to_cpu(from->di_projid_hi);
+       memcpy(to->di_pad, from->di_pad, sizeof(to->di_pad));
+       to->di_flushiter = be16_to_cpu(from->di_flushiter);
+       to->di_atime.t_sec = be32_to_cpu(from->di_atime.t_sec);
+       to->di_atime.t_nsec = be32_to_cpu(from->di_atime.t_nsec);
+       to->di_mtime.t_sec = be32_to_cpu(from->di_mtime.t_sec);
+       to->di_mtime.t_nsec = be32_to_cpu(from->di_mtime.t_nsec);
+       to->di_ctime.t_sec = be32_to_cpu(from->di_ctime.t_sec);
+       to->di_ctime.t_nsec = be32_to_cpu(from->di_ctime.t_nsec);
+       to->di_size = be64_to_cpu(from->di_size);
+       to->di_nblocks = be64_to_cpu(from->di_nblocks);
+       to->di_extsize = be32_to_cpu(from->di_extsize);
+       to->di_nextents = be32_to_cpu(from->di_nextents);
+       to->di_anextents = be16_to_cpu(from->di_anextents);
+       to->di_forkoff = from->di_forkoff;
+       to->di_aformat  = from->di_aformat;
+       to->di_dmevmask = be32_to_cpu(from->di_dmevmask);
+       to->di_dmstate  = be16_to_cpu(from->di_dmstate);
+       to->di_flags    = be16_to_cpu(from->di_flags);
+       to->di_gen      = be32_to_cpu(from->di_gen);
+
+       if (to->di_version == 3) {
+               to->di_changecount = be64_to_cpu(from->di_changecount);
+               to->di_crtime.t_sec = be32_to_cpu(from->di_crtime.t_sec);
+               to->di_crtime.t_nsec = be32_to_cpu(from->di_crtime.t_nsec);
+               to->di_flags2 = be64_to_cpu(from->di_flags2);
+               to->di_ino = be64_to_cpu(from->di_ino);
+               to->di_lsn = be64_to_cpu(from->di_lsn);
+               memcpy(to->di_pad2, from->di_pad2, sizeof(to->di_pad2));
+               uuid_copy(&to->di_uuid, &from->di_uuid);
+       }
+}
+
+void
+xfs_dinode_to_disk(
+       xfs_dinode_t            *to,
+       xfs_icdinode_t          *from)
+{
+       to->di_magic = cpu_to_be16(from->di_magic);
+       to->di_mode = cpu_to_be16(from->di_mode);
+       to->di_version = from ->di_version;
+       to->di_format = from->di_format;
+       to->di_onlink = cpu_to_be16(from->di_onlink);
+       to->di_uid = cpu_to_be32(from->di_uid);
+       to->di_gid = cpu_to_be32(from->di_gid);
+       to->di_nlink = cpu_to_be32(from->di_nlink);
+       to->di_projid_lo = cpu_to_be16(from->di_projid_lo);
+       to->di_projid_hi = cpu_to_be16(from->di_projid_hi);
+       memcpy(to->di_pad, from->di_pad, sizeof(to->di_pad));
+       to->di_atime.t_sec = cpu_to_be32(from->di_atime.t_sec);
+       to->di_atime.t_nsec = cpu_to_be32(from->di_atime.t_nsec);
+       to->di_mtime.t_sec = cpu_to_be32(from->di_mtime.t_sec);
+       to->di_mtime.t_nsec = cpu_to_be32(from->di_mtime.t_nsec);
+       to->di_ctime.t_sec = cpu_to_be32(from->di_ctime.t_sec);
+       to->di_ctime.t_nsec = cpu_to_be32(from->di_ctime.t_nsec);
+       to->di_size = cpu_to_be64(from->di_size);
+       to->di_nblocks = cpu_to_be64(from->di_nblocks);
+       to->di_extsize = cpu_to_be32(from->di_extsize);
+       to->di_nextents = cpu_to_be32(from->di_nextents);
+       to->di_anextents = cpu_to_be16(from->di_anextents);
+       to->di_forkoff = from->di_forkoff;
+       to->di_aformat = from->di_aformat;
+       to->di_dmevmask = cpu_to_be32(from->di_dmevmask);
+       to->di_dmstate = cpu_to_be16(from->di_dmstate);
+       to->di_flags = cpu_to_be16(from->di_flags);
+       to->di_gen = cpu_to_be32(from->di_gen);
+
+       if (from->di_version == 3) {
+               to->di_changecount = cpu_to_be64(from->di_changecount);
+               to->di_crtime.t_sec = cpu_to_be32(from->di_crtime.t_sec);
+               to->di_crtime.t_nsec = cpu_to_be32(from->di_crtime.t_nsec);
+               to->di_flags2 = cpu_to_be64(from->di_flags2);
+               to->di_ino = cpu_to_be64(from->di_ino);
+               to->di_lsn = cpu_to_be64(from->di_lsn);
+               memcpy(to->di_pad2, from->di_pad2, sizeof(to->di_pad2));
+               uuid_copy(&to->di_uuid, &from->di_uuid);
+               to->di_flushiter = 0;
+       } else {
+               to->di_flushiter = cpu_to_be16(from->di_flushiter);
+       }
+}
+
+static bool
+xfs_dinode_verify(
+       struct xfs_mount        *mp,
+       struct xfs_inode        *ip,
+       struct xfs_dinode       *dip)
+{
+       if (dip->di_magic != cpu_to_be16(XFS_DINODE_MAGIC))
+               return false;
+
+       /* only version 3 or greater inodes are extensively verified here */
+       if (dip->di_version < 3)
+               return true;
+
+       if (!xfs_sb_version_hascrc(&mp->m_sb))
+               return false;
+       if (!xfs_verify_cksum((char *)dip, mp->m_sb.sb_inodesize,
+                             offsetof(struct xfs_dinode, di_crc)))
+               return false;
+       if (be64_to_cpu(dip->di_ino) != ip->i_ino)
+               return false;
+       if (!uuid_equal(&dip->di_uuid, &mp->m_sb.sb_uuid))
+               return false;
+       return true;
+}
+
+void
+xfs_dinode_calc_crc(
+       struct xfs_mount        *mp,
+       struct xfs_dinode       *dip)
+{
+       __uint32_t              crc;
+
+       if (dip->di_version < 3)
+               return;
+
+       ASSERT(xfs_sb_version_hascrc(&mp->m_sb));
+       crc = xfs_start_cksum((char *)dip, mp->m_sb.sb_inodesize,
+                             offsetof(struct xfs_dinode, di_crc));
+       dip->di_crc = xfs_end_cksum(crc);
+}
+
+/*
+ * Read the disk inode attributes into the in-core inode structure.
+ *
+ * For version 5 superblocks, if we are initialising a new inode and we are not
+ * utilising the XFS_MOUNT_IKEEP inode cluster mode, we can simple build the 
new
+ * inode core with a random generation number. If we are keeping inodes around,
+ * we need to read the inode cluster to get the existing generation number off
+ * disk. Further, if we are using version 4 superblocks (i.e. v1/v2 inode
+ * format) then log recovery is dependent on the di_flushiter field being
+ * initialised from the current on-disk value and hence we must also read the
+ * inode off disk.
+ */
+int
+xfs_iread(
+       xfs_mount_t     *mp,
+       xfs_trans_t     *tp,
+       xfs_inode_t     *ip,
+       uint            iget_flags)
+{
+       xfs_buf_t       *bp;
+       xfs_dinode_t    *dip;
+       int             error;
+
+       /*
+        * Fill in the location information in the in-core inode.
+        */
+       error = xfs_imap(mp, tp, ip->i_ino, &ip->i_imap, iget_flags);
+       if (error)
+               return error;
+
+       /* shortcut IO on inode allocation if possible */
+       if ((iget_flags & XFS_IGET_CREATE) &&
+           xfs_sb_version_hascrc(&mp->m_sb) &&
+           !(mp->m_flags & XFS_MOUNT_IKEEP)) {
+               /* initialise the on-disk inode core */
+               memset(&ip->i_d, 0, sizeof(ip->i_d));
+               ip->i_d.di_magic = XFS_DINODE_MAGIC;
+               ip->i_d.di_gen = prandom_u32();
+               if (xfs_sb_version_hascrc(&mp->m_sb)) {
+                       ip->i_d.di_version = 3;
+                       ip->i_d.di_ino = ip->i_ino;
+                       uuid_copy(&ip->i_d.di_uuid, &mp->m_sb.sb_uuid);
+               } else
+                       ip->i_d.di_version = 2;
+               return 0;
+       }
+
+       /*
+        * 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;
+}
diff --git a/fs/xfs/xfs_inode_buf.h b/fs/xfs/xfs_inode_buf.h
new file mode 100644
index 0000000..b5f1e22
--- /dev/null
+++ b/fs/xfs/xfs_inode_buf.h
@@ -0,0 +1,53 @@
+/*
+ * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
+ * All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write the Free Software Foundation,
+ * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+#ifndef        __XFS_INODE_BUF_H__
+#define        __XFS_INODE_BUF_H__
+
+struct xfs_inode;
+struct xfs_dinode;
+struct xfs_icdinode;
+
+/*
+ * Inode location information.  Stored in the inode and passed to
+ * xfs_imap_to_bp() to get a buffer and dinode for a given inode.
+ */
+struct xfs_imap {
+       xfs_daddr_t     im_blkno;       /* starting BB of inode chunk */
+       ushort          im_len;         /* length in BBs of inode chunk */
+       ushort          im_boffset;     /* inode offset in block in bytes */
+};
+
+int            xfs_imap_to_bp(struct xfs_mount *, struct xfs_trans *,
+                              struct xfs_imap *, struct xfs_dinode **,
+                              struct xfs_buf **, uint, uint);
+int            xfs_iread(struct xfs_mount *, struct xfs_trans *,
+                         struct xfs_inode *, uint);
+void           xfs_dinode_calc_crc(struct xfs_mount *, struct xfs_dinode *);
+void           xfs_dinode_to_disk(struct xfs_dinode *,
+                                  struct xfs_icdinode *);
+bool           xfs_can_free_eofblocks(struct xfs_inode *, bool);
+
+#if defined(DEBUG)
+void           xfs_inobp_check(struct xfs_mount *, struct xfs_buf *);
+#else
+#define        xfs_inobp_check(mp, bp)
+#endif /* DEBUG */
+
+extern const struct xfs_buf_ops xfs_inode_buf_ops;
+
+#endif /* __XFS_INODE_BUF_H__ */
-- 
1.8.3.2

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