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VFS: Allow the filesystem to return a full file pointer on open intent

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This is needed by NFSv4 for atomicity reasons: our open command is in
 fact a lookup+open, so we need to be able to propagate open context
 information from lookup() into the resulting struct file's
 private_data field.

 Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust
2005-10-18 14:20:16 -07:00
parent 039c4d7a82
commit 834f2a4a15
4 changed files with 165 additions and 27 deletions
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12
fs/exec.c
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@@ -126,8 +126,7 @@ asmlinkage long sys_uselib(const char __user * library)
struct nameidata nd;
int error;
nd.intent.open.flags = FMODE_READ;
error = __user_walk(library, LOOKUP_FOLLOW|LOOKUP_OPEN, &nd);
error = __user_path_lookup_open(library, LOOKUP_FOLLOW, &nd, FMODE_READ);
if (error)
goto out;
@@ -139,7 +138,7 @@ asmlinkage long sys_uselib(const char __user * library)
if (error)
goto exit;
file = dentry_open(nd.dentry, nd.mnt, O_RDONLY);
file = nameidata_to_filp(&nd, O_RDONLY);
error = PTR_ERR(file);
if (IS_ERR(file))
goto out;
@@ -167,6 +166,7 @@ asmlinkage long sys_uselib(const char __user * library)
out:
return error;
exit:
release_open_intent(&nd);
path_release(&nd);
goto out;
}
@@ -490,8 +490,7 @@ struct file *open_exec(const char *name)
int err;
struct file *file;
nd.intent.open.flags = FMODE_READ;
err = path_lookup(name, LOOKUP_FOLLOW|LOOKUP_OPEN, &nd);
err = path_lookup_open(name, LOOKUP_FOLLOW, &nd, FMODE_READ);
file = ERR_PTR(err);
if (!err) {
@@ -504,7 +503,7 @@ struct file *open_exec(const char *name)
err = -EACCES;
file = ERR_PTR(err);
if (!err) {
file = dentry_open(nd.dentry, nd.mnt, O_RDONLY);
file = nameidata_to_filp(&nd, O_RDONLY);
if (!IS_ERR(file)) {
err = deny_write_access(file);
if (err) {
@@ -516,6 +515,7 @@ out:
return file;
}
}
release_open_intent(&nd);
path_release(&nd);
}
goto out;