From 888e2b03ef56694290e58bd9ac23f8033bf6369f Mon Sep 17 00:00:00 2001 From: Al Viro Date: Thu, 3 May 2018 09:45:06 -0400 Subject: switch the rest of procfs lookups to d_splice_alias() Signed-off-by: Al Viro --- fs/proc/generic.c | 3 +-- fs/proc/proc_sysctl.c | 15 ++++++++++++--- 2 files changed, 13 insertions(+), 5 deletions(-) (limited to 'fs/proc') diff --git a/fs/proc/generic.c b/fs/proc/generic.c index 2078e70e1595..b77034a694ef 100644 --- a/fs/proc/generic.c +++ b/fs/proc/generic.c @@ -256,8 +256,7 @@ struct dentry *proc_lookup_de(struct inode *dir, struct dentry *dentry, if (!inode) return ERR_PTR(-ENOMEM); d_set_d_op(dentry, &proc_misc_dentry_ops); - d_add(dentry, inode); - return NULL; + return d_splice_alias(inode, dentry); } read_unlock(&proc_subdir_lock); return ERR_PTR(-ENOENT); diff --git a/fs/proc/proc_sysctl.c b/fs/proc/proc_sysctl.c index 8989936f2995..4d765e5e91ed 100644 --- a/fs/proc/proc_sysctl.c +++ b/fs/proc/proc_sysctl.c @@ -554,9 +554,8 @@ static struct dentry *proc_sys_lookup(struct inode *dir, struct dentry *dentry, if (!inode) goto out; - err = NULL; d_set_d_op(dentry, &proc_sys_dentry_operations); - d_add(dentry, inode); + err = d_splice_alias(inode, dentry); out: if (h) @@ -684,6 +683,7 @@ static bool proc_sys_fill_cache(struct file *file, if (IS_ERR(child)) return false; if (d_in_lookup(child)) { + struct dentry *res; inode = proc_sys_make_inode(dir->d_sb, head, table); if (!inode) { d_lookup_done(child); @@ -691,7 +691,16 @@ static bool proc_sys_fill_cache(struct file *file, return false; } d_set_d_op(child, &proc_sys_dentry_operations); - d_add(child, inode); + res = d_splice_alias(inode, child); + d_lookup_done(child); + if (unlikely(res)) { + if (IS_ERR(res)) { + dput(child); + return false; + } + dput(child); + child = res; + } } } inode = d_inode(child); -- cgit v1.2.3