lkml.org 
[lkml]   [2010]   [Aug]   [27]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH -V19 04/15] vfs: Add handle based readlink syscall
Date
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
---
fs/stat.c | 28 ++++++++++++++++++++++++++++
include/linux/syscalls.h | 3 +++
2 files changed, 31 insertions(+), 0 deletions(-)
diff --git a/fs/stat.c b/fs/stat.c
index 12e90e2..29052eb 100644
--- a/fs/stat.c
+++ b/fs/stat.c
@@ -319,6 +319,34 @@ SYSCALL_DEFINE3(readlink, const char __user *, path, char __user *, buf,
return sys_readlinkat(AT_FDCWD, path, buf, bufsiz);
}

+SYSCALL_DEFINE4(handle_readlink, int, mountdirfd,
+ struct file_handle __user *, ufh,
+ char __user *, buf, int, bufsiz)
+{
+ long retval = 0;
+ struct path path;
+ struct inode *inode;
+
+ if (bufsiz <= 0)
+ return -EINVAL;
+ retval = handle_to_path(mountdirfd, ufh, &path);
+ if (retval)
+ goto out_err;
+
+ inode = path.dentry->d_inode;
+ retval = -EINVAL;
+ if (inode->i_op->readlink) {
+ retval = security_inode_readlink(path.dentry);
+ if (!retval) {
+ touch_atime(path.mnt, path.dentry);
+ retval = inode->i_op->readlink(path.dentry,
+ buf, bufsiz);
+ }
+ }
+ path_put(&path);
+out_err:
+ return retval;
+}

/* ---------- LFS-64 ----------- */
#ifdef __ARCH_WANT_STAT64
diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
index 4dc527c..35ecae3 100644
--- a/include/linux/syscalls.h
+++ b/include/linux/syscalls.h
@@ -838,4 +838,7 @@ asmlinkage long sys_name_to_handle_at(int dfd, const char __user *name,
asmlinkage long sys_open_by_handle_at(int mountdirfd,
struct file_handle __user *handle,
int flags);
+asmlinkage long sys_handle_readlink(int mountdirfd,
+ struct file_handle __user *ufh,
+ char __user *buf, int bufsiz);
#endif
--
1.7.0.4


\
 
 \ /
  Last update: 2010-08-27 13:07    [from the cache]
©2003-2014 Jasper Spaans. Advertise on this site