linux/fs/ext3/namei.h

/*  linux/fs/ext3/namei.h
 *
 * Copyright (C) 2005 Simtec Electronics
 *	Ben Dooks <ben@simtec.co.uk>
 *
*/

extern struct dentry *ext3_get_parent(struct dentry *child);

static inline struct buffer_head *ext3_dir_bread(handle_t *handle,
						 struct inode *inode,
						 int block, int create,
						 int *err)
{
	struct buffer_head *bh;

	bh = ext3_bread(handle, inode, block, create, err);

	if (!bh && !(*err)) {
		*err = -EIO;
		ext3_error(inode->i_sb, __func__,
			   "Directory hole detected on inode %lu\n",
			   inode->i_ino);
		return NULL;
	}
	return bh;
}
[PATCH] ext3: sparse fixes Fix warnings from sparse due to un-declared functions that should either have a header file or have been declared static fs/ext2/bitmap.c:14:15: warning: symbol 'ext2_count_free' was not declared. Should it be static? fs/ext2/namei.c:92:15: warning: symbol 'ext2_get_parent' was not declared. Should it be static? fs/ext3/bitmap.c:15:15: warning: symbol 'ext3_count_free' was not declared. Should it be static? fs/ext3/namei.c:1013:15: warning: symbol 'ext3_get_parent' was not declared. Should it be static? fs/ext3/xattr.c:214:1: warning: symbol 'ext3_xattr_block_get' was not declared. Should it be static? fs/ext3/xattr.c:358:1: warning: symbol 'ext3_xattr_block_list' was not declared. Should it be static? fs/ext3/xattr.c:630:1: warning: symbol 'ext3_xattr_block_find' was not declared. Should it be static? fs/ext3/xattr.c:863:1: warning: symbol 'ext3_xattr_ibody_find' was not declared. Should it be static? Signed-off-by: Ben Dooks <ben-linux@fluff.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org> 2005-10-31 07:02:56 +08:00			`/* linux/fs/ext3/namei.h`
			`*`
			`* Copyright (C) 2005 Simtec Electronics`
			`* Ben Dooks <ben@simtec.co.uk>`
			`*`
			`*/`

			`extern struct dentry ext3_get_parent(struct dentry child);`
ext3: ext3_bread usage audit This is the ext3 version of the same patch applied to Ext4, where such goal is to audit the usage of ext3_bread() due a possible misinterpretion of its return value. Focused on directory blocks, a NULL value returned from ext3_bread() means a hole, which cannot exist into a directory inode. It can pass undetected after a fix in an uninitialized error variable. The (now) initialized variable into ext3_getblk() may lead to a zero'ed return value of ext3_bread() to its callers, which can make the caller do not detect the hole in the directory inode. This patch creates a new wrapper function ext3_dir_bread() which checks for holes properly, reports error, and returns EIO in that case. Signed-off-by: Carlos Maiolino <cmaiolino@redhat.com> Signed-off-by: Jan Kara <jack@suse.cz> 2012-10-03 10:59:23 +08:00
			`static inline struct buffer_head ext3_dir_bread(handle_t handle,`
			`struct inode *inode,`
			`int block, int create,`
			`int *err)`
			`{`
			`struct buffer_head *bh;`

			`bh = ext3_bread(handle, inode, block, create, err);`

			`if (!bh && !(*err)) {`
			`*err = -EIO;`
			`ext3_error(inode->i_sb, __func__,`
			`"Directory hole detected on inode %lu\n",`
			`inode->i_ino);`
			`return NULL;`
			`}`
			`return bh;`
			`}`