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authorAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>2011-01-29 18:43:26 +0530
committerAl Viro <viro@zeniv.linux.org.uk>2011-03-15 02:21:37 -0400
commit990d6c2d7aee921e3bce22b2d6a750fd552262be (patch)
treeaf273c4bfbfd0342d39d05d5a017382eb32a7538 /include
parentf52e0c11305aa09ed56cad97ffc8f0cdc3d78b5d (diff)
vfs: Add name to file handle conversion support
The syscall also return mount id which can be used to lookup file system specific information such as uuid in /proc/<pid>/mountinfo Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'include')
-rw-r--r--include/linux/exportfs.h3
-rw-r--r--include/linux/fs.h7
-rw-r--r--include/linux/syscalls.h5
3 files changed, 14 insertions, 1 deletions
diff --git a/include/linux/exportfs.h b/include/linux/exportfs.h
index 65afdfd31b7..33a42f24b27 100644
--- a/include/linux/exportfs.h
+++ b/include/linux/exportfs.h
@@ -8,6 +8,9 @@ struct inode;
struct super_block;
struct vfsmount;
+/* limit the handle size to NFSv4 handle size now */
+#define MAX_HANDLE_SZ 128
+
/*
* The fileid_type identifies how the file within the filesystem is encoded.
* In theory this is freely set and parsed by the filesystem, but we try to
diff --git a/include/linux/fs.h b/include/linux/fs.h
index b7178b05cf3..3f64630c0e1 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -978,6 +978,13 @@ struct file {
#endif
};
+struct file_handle {
+ __u32 handle_bytes;
+ int handle_type;
+ /* file identifier */
+ unsigned char f_handle[0];
+};
+
#define get_file(x) atomic_long_inc(&(x)->f_count)
#define fput_atomic(x) atomic_long_add_unless(&(x)->f_count, -1, 1)
#define file_count(x) atomic_long_read(&(x)->f_count)
diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
index 98664db1be4..970112613fb 100644
--- a/include/linux/syscalls.h
+++ b/include/linux/syscalls.h
@@ -62,6 +62,7 @@ struct robust_list_head;
struct getcpu_cache;
struct old_linux_dirent;
struct perf_event_attr;
+struct file_handle;
#include <linux/types.h>
#include <linux/aio_abi.h>
@@ -832,5 +833,7 @@ asmlinkage long sys_mmap_pgoff(unsigned long addr, unsigned long len,
unsigned long prot, unsigned long flags,
unsigned long fd, unsigned long pgoff);
asmlinkage long sys_old_mmap(struct mmap_arg_struct __user *arg);
-
+asmlinkage long sys_name_to_handle_at(int dfd, const char __user *name,
+ struct file_handle __user *handle,
+ int __user *mnt_id, int flag);
#endif