[PATCH -V7 5/9] vfs: Add freadlink syscall
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From: Aneesh Kumar K.V on 12 May 2010 12:00 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(a)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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ |