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Subject[PATCH -V19 08/15] vfs: Add handle based xattr syscalls
Date
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
---
fs/xattr.c | 70 ++++++++++++++++++++++++++++++++++++++++++++++
include/linux/syscalls.h | 15 ++++++++++
2 files changed, 85 insertions(+), 0 deletions(-)
diff --git a/fs/xattr.c b/fs/xattr.c
index 01bb813..1d236c9 100644
--- a/fs/xattr.c
+++ b/fs/xattr.c
@@ -335,6 +335,26 @@ SYSCALL_DEFINE5(fsetxattr, int, fd, const char __user *, name,
return error;
}

+SYSCALL_DEFINE6(handle_setxattr, int, mountdirfd,
+ struct file_handle __user *, ufh,
+ const char __user *, name, const void __user *, value,
+ size_t, size, int, flags)
+{
+ struct path path;
+ int error;
+
+ error = handle_to_path(mountdirfd, ufh, &path);
+ if (error)
+ return error;
+ error = mnt_want_write(path.mnt);
+ if (!error) {
+ error = setxattr(path.dentry, name, value, size, flags);
+ mnt_drop_write(path.mnt);
+ }
+ path_put(&path);
+ return error;
+}
+
/*
* Extended attribute GET operations
*/
@@ -416,6 +436,22 @@ SYSCALL_DEFINE4(fgetxattr, int, fd, const char __user *, name,
return error;
}

+SYSCALL_DEFINE5(handle_getxattr, int, mountdirfd,
+ struct file_handle __user *, ufh,
+ const char __user *, name,
+ void __user *, value, size_t, size)
+{
+ struct path path;
+ ssize_t error;
+
+ error = handle_to_path(mountdirfd, ufh, &path);
+ if (error)
+ return error;
+ error = getxattr(path.dentry, name, value, size);
+ path_put(&path);
+ return error;
+}
+
/*
* Extended attribute LIST operations
*/
@@ -488,6 +524,21 @@ SYSCALL_DEFINE3(flistxattr, int, fd, char __user *, list, size_t, size)
return error;
}

+SYSCALL_DEFINE4(handle_listxattr, int, mountdirfd,
+ struct file_handle __user *, ufh,
+ char __user *, list, size_t, size)
+{
+ struct path path;
+ ssize_t error;
+
+ error = handle_to_path(mountdirfd, ufh, &path);
+ if (error)
+ return error;
+ error = listxattr(path.dentry, list, size);
+ path_put(&path);
+ return error;
+}
+
/*
* Extended attribute REMOVE operations
*/
@@ -562,6 +613,25 @@ SYSCALL_DEFINE2(fremovexattr, int, fd, const char __user *, name)
return error;
}

+SYSCALL_DEFINE3(handle_removexattr, int, mountdirfd,
+ struct file_handle __user *, ufh,
+ const char __user *, name)
+{
+ struct path path;
+ int error;
+
+ error = handle_to_path(mountdirfd, ufh, &path);
+ if (error)
+ return error;
+ error = mnt_want_write(path.mnt);
+ if (!error) {
+ error = removexattr(path.dentry, name);
+ mnt_drop_write(path.mnt);
+ }
+ path_put(&path);
+ return error;
+}
+

static const char *
strcmp_prefix(const char *a, const char *a_prefix)
diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
index 6dab72b..4c7e922 100644
--- a/include/linux/syscalls.h
+++ b/include/linux/syscalls.h
@@ -854,4 +854,19 @@ asmlinkage long sys_handle_link(int mountdirfd, struct file_handle __user *uofh,
int newfd, const char __user *newname);
asmlinkage long sys_handle_chown(int mountdirfd, struct file_handle __user *ufh,
uid_t user, gid_t group);
+asmlinkage long sys_handle_setxattr(int mountdirfd,
+ struct file_handle __user *ufh,
+ const char __user *name,
+ const void __user *value,
+ size_t size, int flags);
+asmlinkage long sys_handle_getxattr(int mountdirfd,
+ struct file_handle __user *ufh,
+ const char __user *name,
+ void __user *value, size_t size);
+asmlinkage long sys_handle_listxattr(int mountdirfd,
+ struct file_handle __user *ufh,
+ char __user *list, size_t size);
+asmlinkage long sys_handle_removexattr(int mountdirfd,
+ struct file_handle __user *ufh,
+ const char __user *name);
#endif
--
1.7.0.4


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