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Subject[PATCH -V19 05/15] vfs: Add handle based stat syscall
Date
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
---
arch/x86/ia32/sys_ia32.c | 13 +++++++++++++
fs/stat.c | 42 ++++++++++++++++++++++++++++++++++++++++++
include/linux/fs.h | 3 +++
include/linux/syscalls.h | 9 +++++++++
4 files changed, 67 insertions(+), 0 deletions(-)

diff --git a/arch/x86/ia32/sys_ia32.c b/arch/x86/ia32/sys_ia32.c
index 849813f..7f679e4 100644
--- a/arch/x86/ia32/sys_ia32.c
+++ b/arch/x86/ia32/sys_ia32.c
@@ -138,6 +138,19 @@ asmlinkage long sys32_fstatat(unsigned int dfd, const char __user *filename,
return cp_stat64(statbuf, &stat);
}

+asmlinkage long sys32_handle_stat64(int mountdirfd,
+ struct file_handle __user *ufh,
+ struct stat64 __user *statbuf)
+{
+ struct kstat stat;
+ int error;
+
+ error = do_handle_stat(mountdirfd, ufh, &stat);
+ if (error)
+ return error;
+ return cp_stat64(statbuf, &stat);
+}
+
/*
* Linux/i386 didn't use to be able to handle more than
* 4 system call parameters, so these system calls used a memory
diff --git a/fs/stat.c b/fs/stat.c
index 29052eb..d448876 100644
--- a/fs/stat.c
+++ b/fs/stat.c
@@ -286,6 +286,35 @@ SYSCALL_DEFINE2(newfstat, unsigned int, fd, struct stat __user *, statbuf)
return error;
}

+int do_handle_stat(int mountdirfd, struct file_handle __user *ufh,
+ struct kstat *stat)
+{
+ struct path path;
+ int error = -EINVAL;
+
+ error = handle_to_path(mountdirfd, ufh, &path);
+ if (error)
+ goto out;
+
+ error = vfs_getattr(path.mnt, path.dentry, stat);
+ path_put(&path);
+out:
+ return error;
+}
+
+SYSCALL_DEFINE3(handle_stat, int, mountdirfd,
+ struct file_handle __user *, ufh,
+ struct stat __user *, statbuf)
+{
+ struct kstat stat;
+ int error;
+
+ error = do_handle_stat(mountdirfd, ufh, &stat);
+ if (error)
+ return error;
+ return cp_new_stat(&stat, statbuf);
+}
+
SYSCALL_DEFINE4(readlinkat, int, dfd, const char __user *, pathname,
char __user *, buf, int, bufsiz)
{
@@ -434,6 +463,19 @@ SYSCALL_DEFINE4(fstatat64, int, dfd, const char __user *, filename,
return error;
return cp_new_stat64(&stat, statbuf);
}
+
+SYSCALL_DEFINE3(handle_stat64, int, mountdirfd,
+ struct file_handle __user *, ufh,
+ struct stat64 __user *, statbuf)
+{
+ struct kstat stat;
+ int error;
+
+ error = do_handle_stat(mountdirfd, ufh, &stat);
+ if (error)
+ return error;
+ return cp_new_stat64(&stat, statbuf);
+}
#endif /* __ARCH_WANT_STAT64 */

/* Caller is here responsible for sufficient locking (ie. inode->i_lock) */
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 134f97a..8dde859 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -2339,6 +2339,9 @@ extern int vfs_stat(const char __user *, struct kstat *);
extern int vfs_lstat(const char __user *, struct kstat *);
extern int vfs_fstat(unsigned int, struct kstat *);
extern int vfs_fstatat(int , const char __user *, struct kstat *, int);
+extern int do_handle_stat(int mountdirfd,
+ struct file_handle __user *ufh,
+ struct kstat *stat);

extern int do_vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd,
unsigned long arg);
diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
index 35ecae3..e45ef50 100644
--- a/include/linux/syscalls.h
+++ b/include/linux/syscalls.h
@@ -841,4 +841,13 @@ asmlinkage long sys_open_by_handle_at(int mountdirfd,
asmlinkage long sys_handle_readlink(int mountdirfd,
struct file_handle __user *ufh,
char __user *buf, int bufsiz);
+#if BITS_PER_LONG == 32
+asmlinkage long sys_handle_stat64(int mountdirfd,
+ struct file_handle __user *ufh,
+ struct stat64 __user *statbuf);
+#else
+asmlinkage long sys_handle_stat(int mountdirfd,
+ struct file_handle __user *ufh,
+ struct stat __user *statbuf);
+#endif
#endif
--
1.7.0.4


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