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authorChristoph Hellwig <hch@infradead.org>2007-07-17 04:04:29 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-07-17 10:23:06 -0700
commit5ca29607331fe37980dc3b488793ef8b1409b722 (patch)
treecf4e5ad786aeebc8d82d1b867ab3d91d0cb4b824 /fs/exportfs
parenta569425512253992cc64ebf8b6d00a62f986db3e (diff)
downloadop-kernel-dev-5ca29607331fe37980dc3b488793ef8b1409b722.zip
op-kernel-dev-5ca29607331fe37980dc3b488793ef8b1409b722.tar.gz
knfsd: exportfs: remove iget abuse
When the exportfs interface was added the expectation was that filesystems provide an operation to convert from a file handle to an inode/dentry, but it kept a backwards compat option that still calls into iget. Calling into iget from non-filesystem code is very bad, because it gives too little information to filesystem, and simply crashes if the filesystem doesn't implement the ->read_inode routine. Fortunately there are only two filesystems left using this fallback: efs and jfs. This patch moves a copy of export_iget to each of those to implement the get_dentry method. While this is a temporary increase of lines of code in the kernel it allows for a much cleaner interface and important code restructuring in later patches. [akpm@linux-foundation.org: add jfs_get_inode_flags() declaration] Signed-off-by: Dave Kleikamp <shaggy@linux.vnet.ibm.com> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/exportfs')
-rw-r--r--fs/exportfs/expfs.c56
1 files changed, 3 insertions, 53 deletions
diff --git a/fs/exportfs/expfs.c b/fs/exportfs/expfs.c
index 16287af..dd132bb 100644
--- a/fs/exportfs/expfs.c
+++ b/fs/exportfs/expfs.c
@@ -391,61 +391,11 @@ out:
return error;
}
-
-static struct dentry *export_iget(struct super_block *sb, unsigned long ino, __u32 generation)
+static struct dentry *get_dentry(struct super_block *sb, void *vobjp)
{
-
- /* iget isn't really right if the inode is currently unallocated!!
- * This should really all be done inside each filesystem
- *
- * ext2fs' read_inode has been strengthed to return a bad_inode if
- * the inode had been deleted.
- *
- * Currently we don't know the generation for parent directory, so
- * a generation of 0 means "accept any"
- */
- struct inode *inode;
- struct dentry *result;
- if (ino == 0)
- return ERR_PTR(-ESTALE);
- inode = iget(sb, ino);
- if (inode == NULL)
- return ERR_PTR(-ENOMEM);
- if (is_bad_inode(inode)
- || (generation && inode->i_generation != generation)
- ) {
- /* we didn't find the right inode.. */
- dprintk("fh_verify: Inode %lu, Bad count: %d %d or version %u %u\n",
- inode->i_ino,
- inode->i_nlink, atomic_read(&inode->i_count),
- inode->i_generation,
- generation);
-
- iput(inode);
- return ERR_PTR(-ESTALE);
- }
- /* now to find a dentry.
- * If possible, get a well-connected one
- */
- result = d_alloc_anon(inode);
- if (!result) {
- iput(inode);
- return ERR_PTR(-ENOMEM);
- }
- return result;
+ return ERR_PTR(-ESTALE);
}
-
-static struct dentry *get_object(struct super_block *sb, void *vobjp)
-{
- __u32 *objp = vobjp;
- unsigned long ino = objp[0];
- __u32 generation = objp[1];
-
- return export_iget(sb, ino, generation);
-}
-
-
/**
* export_encode_fh - default export_operations->encode_fh function
* @dentry: the dentry to encode
@@ -524,7 +474,7 @@ struct export_operations export_op_default = {
.get_name = get_name,
.get_parent = get_parent,
- .get_dentry = get_object,
+ .get_dentry = get_dentry,
};
EXPORT_SYMBOL(export_op_default);
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