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Preparations to caching root in path_walk() 

Split do_path_lookup(), opencode the call from do_filp_open()
do_filp_open() is the only caller of do_path_lookup() that
cares about root afterwards (it keeps resolving symlinks on
O_CREAT path after it'd done LOOKUP_PARENT walk).  So when
we start caching fs->root in path_walk(), it'll need a different
treatment.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2009-04-07 11:44:16 -04:00
parent 4e44b6852e
commit 9b4a9b14a7
1 changed files with 23 additions and 12 deletions
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35
fs/namei.c
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@ -1017,9 +1017,7 @@ static int path_walk(const char *name, struct nameidata *nd)
return link_path_walk(name, nd);
}
/* Returns 0 and nd will be valid on success; Retuns error, otherwise. */
static int do_path_lookup(int dfd, const char *name,
unsigned int flags, struct nameidata *nd)
static int path_init(int dfd, const char *name, unsigned int flags, struct nameidata *nd)
{
int retval = 0;
int fput_needed;
@ -1063,17 +1061,25 @@ static int do_path_lookup(int dfd, const char *name,
fput_light(file, fput_needed);
}
retval = path_walk(name, nd);
if (unlikely(!retval && !audit_dummy_context() && nd->path.dentry &&
nd->path.dentry->d_inode))
audit_inode(name, nd->path.dentry);
out_fail:
return retval;
return 0;
fput_fail:
fput_light(file, fput_needed);
goto out_fail;
out_fail:
return retval;
}
/* Returns 0 and nd will be valid on success; Retuns error, otherwise. */
static int do_path_lookup(int dfd, const char *name,
unsigned int flags, struct nameidata *nd)
{
int retval = path_init(dfd, name, flags, nd);
if (!retval)
retval = path_walk(name, nd);
if (unlikely(!retval && !audit_dummy_context() && nd->path.dentry &&
nd->path.dentry->d_inode))
audit_inode(name, nd->path.dentry);
return retval;
}
int path_lookup(const char *name, unsigned int flags,
@ -1676,9 +1682,14 @@ struct file *do_filp_open(int dfd, const char *pathname,
/*
* Create - we need to know the parent.
*/
error = do_path_lookup(dfd, pathname, LOOKUP_PARENT, &nd);
error = path_init(dfd, pathname, LOOKUP_PARENT, &nd);
if (error)
return ERR_PTR(error);
error = path_walk(pathname, &nd);
if (error)
return ERR_PTR(error);
if (unlikely(!audit_dummy_context()))
audit_inode(pathname, nd.path.dentry);
/*
* We have the parent and last component. First of all, check