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Commit 79eb4dde authored by Nick Piggin's avatar Nick Piggin
Browse files

cifs: dont overwrite dentry name in d_revalidate 



Use vfat's method for dealing with negative dentries to preserve case,
rather than overwrite dentry name in d_revalidate, which is a bit ugly
and also gets in the way of doing lock-free path walking.

Signed-off-by: default avatarNick Piggin <npiggin@kernel.dk>
parent fe15ce44

fs/cifs/dir.c

+24 −19
Original line number Original line Diff line number Diff line
@@ -656,22 +656,34 @@ cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry, 
static int

static int

cifs_d_revalidate(struct dentry *direntry, struct nameidata *nd)

cifs_d_revalidate(struct dentry *direntry, struct nameidata *nd)

{

{

	int isValid = 1;



	if (direntry->d_inode) {

	if (direntry->d_inode) {

		if (cifs_revalidate_dentry(direntry))

		if (cifs_revalidate_dentry(direntry))

			return 0;

			return 0;

	} else {

		else

		cFYI(1, "neg dentry 0x%p name = %s",

			return 1;

			 direntry, direntry->d_name.name);

		if (time_after(jiffies, direntry->d_time + HZ) ||

			!lookupCacheEnabled) {

			d_drop(direntry);

			isValid = 0;

	}

	}



	/*

	 * This may be nfsd (or something), anyway, we can't see the

	 * intent of this. So, since this can be for creation, drop it.

	 */

	if (!nd)

		return 0;



	/*

	 * Drop the negative dentry, in order to make sure to use the

	 * case sensitive name which is specified by user if this is

	 * for creation.

	 */

	if (!(nd->flags & (LOOKUP_CONTINUE | LOOKUP_PARENT))) {

		if (nd->flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET))

			return 0;

	}

	}





	return isValid;

	if (time_after(jiffies, direntry->d_time + HZ) || !lookupCacheEnabled)

		return 0;



	return 1;

}

}





/* static int cifs_d_delete(struct dentry *direntry)

/* static int cifs_d_delete(struct dentry *direntry)
@@ -709,15 +721,8 @@ static int cifs_ci_compare(struct dentry *dentry, struct qstr *a, 
	struct nls_table *codepage = CIFS_SB(dentry->d_inode->i_sb)->local_nls;

	struct nls_table *codepage = CIFS_SB(dentry->d_inode->i_sb)->local_nls;





	if ((a->len == b->len) &&

	if ((a->len == b->len) &&

	    (nls_strnicmp(codepage, a->name, b->name, a->len) == 0)) {

	    (nls_strnicmp(codepage, a->name, b->name, a->len) == 0))

		/*

		 * To preserve case, don't let an existing negative dentry's

		 * case take precedence.  If a is not a negative dentry, this

		 * should have no side effects

		 */

		memcpy((void *)a->name, b->name, a->len);

		return 0;

		return 0;

	}

	return 1;

	return 1;

}

}