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Subject[PATCH -V7 5/9] vfs: Add freadlink syscall
Date
This enables to use open-by-handle and then get the link target
details of a symlink using the fd returned by handle

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
---
fs/stat.c | 27 +++++++++++++++++++++++++++
1 files changed, 27 insertions(+), 0 deletions(-)

diff --git a/fs/stat.c b/fs/stat.c
index c4ecd52..0fbab00 100644
--- a/fs/stat.c
+++ b/fs/stat.c
@@ -314,6 +314,33 @@ SYSCALL_DEFINE3(readlink, const char __user *, path, char __user *, buf,
return sys_readlinkat(AT_FDCWD, path, buf, bufsiz);
}

+SYSCALL_DEFINE3(freadlink, int, fd, char __user *, buf,
+ int, bufsiz)
+{
+ int fput_needed;
+ struct file *file;
+ int error = -EBADF;
+ struct inode *inode;
+
+ file = fget_light(fd, &fput_needed);
+ if (!file)
+ return error;
+
+ inode = file->f_path.dentry->d_inode;
+ error = -EINVAL;
+ if (inode->i_op->readlink) {
+ error = security_inode_readlink(file->f_path.dentry);
+ if (!error) {
+ touch_atime(file->f_path.mnt, file->f_path.dentry);
+ error = inode->i_op->readlink(file->f_path.dentry,
+ buf, bufsiz);
+ }
+ }
+ fput_light(file, fput_needed);
+ return error;
+}
+
+

/* ---------- LFS-64 ----------- */
#ifdef __ARCH_WANT_STAT64
--
1.7.1.78.g212f0


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