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author | Christoph Hellwig <hch@infradead.org> | 2007-07-17 04:04:29 -0700 |
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committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-07-17 10:23:06 -0700 |
commit | 5ca29607331fe37980dc3b488793ef8b1409b722 (patch) | |
tree | cf4e5ad786aeebc8d82d1b867ab3d91d0cb4b824 /fs/exportfs | |
parent | a569425512253992cc64ebf8b6d00a62f986db3e (diff) | |
download | kernel_samsung_tuna-5ca29607331fe37980dc3b488793ef8b1409b722.zip kernel_samsung_tuna-5ca29607331fe37980dc3b488793ef8b1409b722.tar.gz kernel_samsung_tuna-5ca29607331fe37980dc3b488793ef8b1409b722.tar.bz2 |
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.c | 56 |
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); |