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isofs: new export ops

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Nice little cleanup by consolidating things a little and using a structure for
the special file handle format.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Cc: Neil Brown <neilb@suse.de>
Cc: "J. Bruce Fields" <bfields@fieldses.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Christoph Hellwig 2007-10-21 16:42:12 -07:00 committed by Linus Torvalds
parent 1305edad01
commit 905251a02e
1 changed files with 29 additions and 38 deletions
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67
fs/isofs/export.c
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@ -42,16 +42,6 @@ isofs_export_iget(struct super_block *sb,
return result;
}
static struct dentry *
isofs_export_get_dentry(struct super_block *sb, void *vobjp)
{
__u32 *objp = vobjp;
unsigned long block = objp[0];
unsigned long offset = objp[1];
__u32 generation = objp[2];
return isofs_export_iget(sb, block, offset, generation);
}
/* This function is surprisingly simple. The trick is understanding
* that "child" is always a directory. So, to find its parent, you
* simply need to find its ".." entry, normalize its block and offset,
@ -182,43 +172,44 @@ isofs_export_encode_fh(struct dentry *dentry,
return type;
}
struct isofs_fid {
u32 block;
u16 offset;
u16 parent_offset;
u32 generation;
u32 parent_block;
u32 parent_generation;
};
static struct dentry *
isofs_export_decode_fh(struct super_block *sb,
__u32 *fh32,
int fh_len,
int fileid_type,
int (*acceptable)(void *context, struct dentry *de),
void *context)
static struct dentry *isofs_fh_to_dentry(struct super_block *sb,
struct fid *fid, int fh_len, int fh_type)
{
__u16 *fh16 = (__u16*)fh32;
__u32 child[3]; /* The child is what triggered all this. */
__u32 parent[3]; /* The parent is just along for the ride. */
struct isofs_fid *ifid = (struct isofs_fid *)fid;
if (fh_len < 3 || fileid_type > 2)
if (fh_len < 3 || fh_type > 2)
return NULL;
child[0] = fh32[0];
child[1] = fh16[2]; /* fh16 [sic] */
child[2] = fh32[2];
parent[0] = 0;
parent[1] = 0;
parent[2] = 0;
if (fileid_type == 2) {
if (fh_len > 2) parent[0] = fh32[3];
parent[1] = fh16[3]; /* fh16 [sic] */
if (fh_len > 4) parent[2] = fh32[4];
}
return sb->s_export_op->find_exported_dentry(sb, child, parent,
acceptable, context);
return isofs_export_iget(sb, ifid->block, ifid->offset,
ifid->generation);
}
static struct dentry *isofs_fh_to_parent(struct super_block *sb,
struct fid *fid, int fh_len, int fh_type)
{
struct isofs_fid *ifid = (struct isofs_fid *)fid;
if (fh_type != 2)
return NULL;
return isofs_export_iget(sb,
fh_len > 2 ? ifid->parent_block : 0,
ifid->parent_offset,
fh_len > 4 ? ifid->parent_generation : 0);
}
struct export_operations isofs_export_ops = {
.decode_fh = isofs_export_decode_fh,
.encode_fh = isofs_export_encode_fh,
.get_dentry = isofs_export_get_dentry,
.fh_to_dentry = isofs_fh_to_dentry,
.fh_to_parent = isofs_fh_to_parent,
.get_parent = isofs_export_get_parent,
};