From 76fa66657900071016f2bae61de28f059f3f2abf Mon Sep 17 00:00:00 2001 From: Jeff Layton Date: Tue, 2 Jul 2013 13:00:52 -0400 Subject: [PATCH] rpc_pipe: set dentry operations at d_alloc time Currently the way these get set is a little convoluted. If the dentry is allocated via lookup from userland, then it gets set by simple_lookup. If it gets allocated when the kernel is populating the directory, then it gets set via __rpc_lookup_create_exclusive, which has to check whether they might already be set. Between both of these, this ensures that all dentries have their d_op pointer set. Instead of doing that, just have them set at d_alloc time by pointing sb->s_d_op at them. With that change, we no longer want the lookup op to set them, so we must move to using our own lookup routine. Signed-off-by: Jeff Layton Signed-off-by: Trond Myklebust --- net/sunrpc/rpc_pipe.c | 25 ++++++++++++++++++++----- 1 file changed, 20 insertions(+), 5 deletions(-) diff --git a/net/sunrpc/rpc_pipe.c b/net/sunrpc/rpc_pipe.c index 4679df5a6d50..c5f6812ca06a 100644 --- a/net/sunrpc/rpc_pipe.c +++ b/net/sunrpc/rpc_pipe.c @@ -480,6 +480,23 @@ static const struct dentry_operations rpc_dentry_operations = { .d_delete = rpc_delete_dentry, }; +/* + * Lookup the data. This is trivial - if the dentry didn't already + * exist, we know it is negative. + */ +static struct dentry * +rpc_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags) +{ + if (dentry->d_name.len > NAME_MAX) + return ERR_PTR(-ENAMETOOLONG); + d_add(dentry, NULL); + return NULL; +} + +const struct inode_operations rpc_dir_inode_operations = { + .lookup = rpc_lookup, +}; + static struct inode * rpc_get_inode(struct super_block *sb, umode_t mode) { @@ -492,7 +509,7 @@ rpc_get_inode(struct super_block *sb, umode_t mode) switch (mode & S_IFMT) { case S_IFDIR: inode->i_fop = &simple_dir_operations; - inode->i_op = &simple_dir_inode_operations; + inode->i_op = &rpc_dir_inode_operations; inc_nlink(inode); default: break; @@ -666,11 +683,8 @@ static struct dentry *__rpc_lookup_create_exclusive(struct dentry *parent, if (!dentry) return ERR_PTR(-ENOMEM); } - if (dentry->d_inode == NULL) { - if (!dentry->d_op) - d_set_d_op(dentry, &rpc_dentry_operations); + if (dentry->d_inode == NULL) return dentry; - } dput(dentry); return ERR_PTR(-EEXIST); } @@ -1117,6 +1131,7 @@ rpc_fill_super(struct super_block *sb, void *data, int silent) sb->s_blocksize_bits = PAGE_CACHE_SHIFT; sb->s_magic = RPCAUTH_GSSMAGIC; sb->s_op = &s_ops; + sb->s_d_op = &rpc_dentry_operations; sb->s_time_gran = 1; inode = rpc_get_inode(sb, S_IFDIR | S_IRUGO | S_IXUGO); -- GitLab