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[GFS2] Clean up inode number handling

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This patch cleans up the inode number handling code. The main difference
is that instead of looking up the inodes using a struct gfs2_inum_host
we now use just the no_addr member of this structure. The tests relating
to no_formal_ino can then be done by the calling code. This has
advantages in that we want to do different things in different code
paths if the no_formal_ino doesn't match. In the NFS patch we want to
return -ESTALE, but in the ->lookup() path, its a bug in the fs if the
no_formal_ino doesn't match and thus we can withdraw in this case.

In order to later fix bz #201012, we need to be able to look up an inode
without knowing no_formal_ino, as the only information that is known to
us is the on-disk location of the inode in question.

This patch will also help us to fix bz #236099 at a later date by
cleaning up a lot of the code in that area.

There are no user visible changes as a result of this patch and there
are no changes to the on-disk format either.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
This commit is contained in:
Steven Whitehouse
2007-05-15 15:37:50 +01:00
parent 41d7db0ab4
commit dbb7cae2a3
19 changed files with 162 additions and 170 deletions
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29
fs/gfs2/ops_export.c
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@@ -75,10 +75,10 @@ static int gfs2_encode_fh(struct dentry *dentry, __u32 *p, int *len,
(connectable && *len < GFS2_LARGE_FH_SIZE))
return 255;
fh[0] = cpu_to_be32(ip->i_num.no_formal_ino >> 32);
fh[1] = cpu_to_be32(ip->i_num.no_formal_ino & 0xFFFFFFFF);
fh[2] = cpu_to_be32(ip->i_num.no_addr >> 32);
fh[3] = cpu_to_be32(ip->i_num.no_addr & 0xFFFFFFFF);
fh[0] = cpu_to_be32(ip->i_no_formal_ino >> 32);
fh[1] = cpu_to_be32(ip->i_no_formal_ino & 0xFFFFFFFF);
fh[2] = cpu_to_be32(ip->i_no_addr >> 32);
fh[3] = cpu_to_be32(ip->i_no_addr & 0xFFFFFFFF);
*len = GFS2_SMALL_FH_SIZE;
if (!connectable || inode == sb->s_root->d_inode)
@@ -90,10 +90,10 @@ static int gfs2_encode_fh(struct dentry *dentry, __u32 *p, int *len,
igrab(inode);
spin_unlock(&dentry->d_lock);
fh[4] = cpu_to_be32(ip->i_num.no_formal_ino >> 32);
fh[5] = cpu_to_be32(ip->i_num.no_formal_ino & 0xFFFFFFFF);
fh[6] = cpu_to_be32(ip->i_num.no_addr >> 32);
fh[7] = cpu_to_be32(ip->i_num.no_addr & 0xFFFFFFFF);
fh[4] = cpu_to_be32(ip->i_no_formal_ino >> 32);
fh[5] = cpu_to_be32(ip->i_no_formal_ino & 0xFFFFFFFF);
fh[6] = cpu_to_be32(ip->i_no_addr >> 32);
fh[7] = cpu_to_be32(ip->i_no_addr & 0xFFFFFFFF);
fh[8] = cpu_to_be32(inode->i_mode);
fh[9] = 0; /* pad to double word */
@@ -144,7 +144,8 @@ static int gfs2_get_name(struct dentry *parent, char *name,
ip = GFS2_I(inode);
*name = 0;
gnfd.inum = ip->i_num;
gnfd.inum.no_addr = ip->i_no_addr;
gnfd.inum.no_formal_ino = ip->i_no_formal_ino;
gnfd.name = name;
error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &gh);
@@ -202,9 +203,9 @@ static struct dentry *gfs2_get_dentry(struct super_block *sb, void *inum_obj)
/* System files? */
inode = gfs2_ilookup(sb, inum);
inode = gfs2_ilookup(sb, inum->no_addr);
if (inode) {
if (GFS2_I(inode)->i_num.no_formal_ino != inum->no_formal_ino) {
if (GFS2_I(inode)->i_no_formal_ino != inum->no_formal_ino) {
iput(inode);
return ERR_PTR(-ESTALE);
}
@@ -236,7 +237,7 @@ static struct dentry *gfs2_get_dentry(struct super_block *sb, void *inum_obj)
gfs2_glock_dq_uninit(&rgd_gh);
gfs2_glock_dq_uninit(&ri_gh);
inode = gfs2_inode_lookup(sb, inum, fh_obj->imode);
inode = gfs2_inode_lookup(sb, inum->no_addr, fh_obj->imode);
if (!inode)
goto fail;
if (IS_ERR(inode)) {
@@ -249,6 +250,10 @@ static struct dentry *gfs2_get_dentry(struct super_block *sb, void *inum_obj)
iput(inode);
goto fail;
}
if (GFS2_I(inode)->i_no_formal_ino != inum->no_formal_ino) {
iput(inode);
goto fail;
}
error = -EIO;
if (GFS2_I(inode)->i_di.di_flags & GFS2_DIF_SYSTEM) {