From 38e0abdcfb5e69aa61a1e9b474d434afc1c177a9 Mon Sep 17 00:00:00 2001 From: Namjae Jeon Date: Thu, 13 Dec 2012 23:44:11 +0900 Subject: f2fs: fix up f2fs_get_parent issue to retrieve correct parent inode number Test Case: [NFS Client] ls -lR . [NFS Server] while [ 1 ] do echo 3 > /proc/sys/vm/drop_caches done Error on NFS Client: "No such file or directory" When cache is dropped at the server, it results in lookup failure at the NFS client due to non-connection with the parent. The default path is it initiates a lookup by calculating the hash value for the name, even though the hash values stored on the disk for "." and ".." is maintained as zero, which results in failure from find_in_block due to not matching HASH values. Fix up, by using the correct hashing values for these entries. Signed-off-by: Namjae Jeon Signed-off-by: Amit Sahrawat Signed-off-by: Jaegeuk Kim --- fs/f2fs/dir.c | 4 ++-- fs/f2fs/hash.c | 4 ++++ 2 files changed, 6 insertions(+), 2 deletions(-) (limited to 'fs') diff --git a/fs/f2fs/dir.c b/fs/f2fs/dir.c index b4e24f32b54e..e1f66df0f97d 100644 --- a/fs/f2fs/dir.c +++ b/fs/f2fs/dir.c @@ -540,13 +540,13 @@ int f2fs_make_empty(struct inode *inode, struct inode *parent) de = &dentry_blk->dentry[0]; de->name_len = cpu_to_le16(1); - de->hash_code = 0; + de->hash_code = f2fs_dentry_hash(".", 1); de->ino = cpu_to_le32(inode->i_ino); memcpy(dentry_blk->filename[0], ".", 1); set_de_type(de, inode); de = &dentry_blk->dentry[1]; - de->hash_code = 0; + de->hash_code = f2fs_dentry_hash("..", 2); de->name_len = cpu_to_le16(2); de->ino = cpu_to_le32(parent->i_ino); memcpy(dentry_blk->filename[1], "..", 2); diff --git a/fs/f2fs/hash.c b/fs/f2fs/hash.c index a60f04200f8b..5e48baca3597 100644 --- a/fs/f2fs/hash.c +++ b/fs/f2fs/hash.c @@ -76,6 +76,10 @@ f2fs_hash_t f2fs_dentry_hash(const char *name, int len) const char *p; __u32 in[8], buf[4]; + if ((len <= 2) && (name[0] == '.') && + (name[1] == '.' || name[1] == '\0')) + return 0; + /* Initialize the default seed for the hash checksum functions */ buf[0] = 0x67452301; buf[1] = 0xefcdab89; -- cgit v1.2.3