XFS has a mode called invisble I/O that doesn't update any of the
timestamps. It's used for HSM-style applications and exposed through
the nasty open by handle ioctl.
Instead of doing directly assignment of file operations that set an
internal flag for it add a new FMODE_NOCMTIME flag that we can check
in the normal file operations.
Note that I'd like to get this into 2.6.29 via the XFS tree as there
are a lot changes in XFS that would cause conflicts otherwise.
For 2.6.30 I'll plan turning it into a proper O_ flag available via
open(2), but for now I just want to sort out the XFS issues.
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
Index: xfs/fs/xfs/linux-2.6/xfs_ioctl32.c
===================================================================
--- xfs.orig/fs/xfs/linux-2.6/xfs_ioctl32.c 2008-12-03 18:30:14.000000000 +0100
+++ xfs/fs/xfs/linux-2.6/xfs_ioctl32.c 2008-12-03 18:30:34.000000000 +0100
@@ -599,19 +599,24 @@ out:
return error;
}
-STATIC long
-xfs_compat_ioctl(
- xfs_inode_t *ip,
- struct file *filp,
- int ioflags,
- unsigned cmd,
- void __user *arg)
+long
+xfs_file_compat_ioctl(
+ struct file *filp,
+ unsigned cmd,
+ unsigned long p)
{
- struct inode *inode = filp->f_path.dentry->d_inode;
- xfs_mount_t *mp = ip->i_mount;
- int error;
+ struct inode *inode = filp->f_path.dentry->d_inode;
+ struct xfs_inode *ip = XFS_I(inode);
+ struct xfs_mount *mp = ip->i_mount;
+ void __user *arg = (void __user *)p;
+ int ioflags = 0;
+ int error;
+
+ if (filp->f_mode & FMODE_NOCMTIME)
+ ioflags |= IO_INVIS;
+
+ xfs_itrace_entry(ip);
- xfs_itrace_entry(XFS_I(inode));
switch (cmd) {
/* No size or alignment issues on any arch */
case XFS_IOC_DIOINFO:
@@ -632,7 +637,7 @@ xfs_compat_ioctl(
case XFS_IOC_GOINGDOWN:
case XFS_IOC_ERROR_INJECTION:
case XFS_IOC_ERROR_CLEARALL:
- return xfs_ioctl(ip, filp, ioflags, cmd, arg);
+ return xfs_file_ioctl(filp, cmd, p);
#ifndef BROKEN_X86_ALIGNMENT
/* These are handled fine if no alignment issues */
case XFS_IOC_ALLOCSP:
@@ -646,7 +651,7 @@ xfs_compat_ioctl(
case XFS_IOC_FSGEOMETRY_V1:
case XFS_IOC_FSGROWFSDATA:
case XFS_IOC_FSGROWFSRT:
- return xfs_ioctl(ip, filp, ioflags, cmd, arg);
+ return xfs_file_ioctl(filp, cmd, p);
#else
case XFS_IOC_ALLOCSP_32:
case XFS_IOC_FREESP_32:
@@ -687,7 +692,7 @@ xfs_compat_ioctl(
case XFS_IOC_SETXFLAGS_32:
case XFS_IOC_GETVERSION_32:
cmd = _NATIVE_IOC(cmd, long);
- return xfs_ioctl(ip, filp, ioflags, cmd, arg);
+ return xfs_file_ioctl(filp, cmd, p);
case XFS_IOC_SWAPEXT: {
struct xfs_swapext sxp;
struct compat_xfs_swapext __user *sxu = arg;
@@ -738,26 +743,3 @@ xfs_compat_ioctl(
return -XFS_ERROR(ENOIOCTLCMD);
}
}
-
-long
-xfs_file_compat_ioctl(
- struct file *filp,
- unsigned int cmd,
- unsigned long p)
-{
- struct inode *inode = filp->f_path.dentry->d_inode;
-
- return xfs_compat_ioctl(XFS_I(inode), filp, 0, cmd, (void __user *)p);
-}
-
-long
-xfs_file_compat_invis_ioctl(
- struct file *filp,
- unsigned int cmd,
- unsigned long p)
-{
- struct inode *inode = filp->f_path.dentry->d_inode;
-
- return xfs_compat_ioctl(XFS_I(inode), filp, IO_INVIS, cmd,
- (void __user *)p);
-}
Index: xfs/fs/xfs/linux-2.6/xfs_file.c
===================================================================
--- xfs.orig/fs/xfs/linux-2.6/xfs_file.c 2008-12-03 18:30:14.000000000 +0100
+++ xfs/fs/xfs/linux-2.6/xfs_file.c 2008-12-03 18:30:34.000000000 +0100
@@ -45,81 +45,45 @@
static struct vm_operations_struct xfs_file_vm_ops;
-STATIC_INLINE ssize_t
-__xfs_file_read(
+STATIC ssize_t
+xfs_file_aio_read(
struct kiocb *iocb,
const struct iovec *iov,
unsigned long nr_segs,
- int ioflags,
loff_t pos)
{
struct file *file = iocb->ki_filp;
+ int ioflags = IO_ISAIO;
BUG_ON(iocb->ki_pos != pos);
if (unlikely(file->f_flags & O_DIRECT))
ioflags |= IO_ISDIRECT;
+ if (file->f_mode & FMODE_NOCMTIME)
+ ioflags |= IO_INVIS;
return xfs_read(XFS_I(file->f_path.dentry->d_inode), iocb, iov,
nr_segs, &iocb->ki_pos, ioflags);
}
STATIC ssize_t
-xfs_file_aio_read(
- struct kiocb *iocb,
- const struct iovec *iov,
- unsigned long nr_segs,
- loff_t pos)
-{
- return __xfs_file_read(iocb, iov, nr_segs, IO_ISAIO, pos);
-}
-
-STATIC ssize_t
-xfs_file_aio_read_invis(
- struct kiocb *iocb,
- const struct iovec *iov,
- unsigned long nr_segs,
- loff_t pos)
-{
- return __xfs_file_read(iocb, iov, nr_segs, IO_ISAIO|IO_INVIS, pos);
-}
-
-STATIC_INLINE ssize_t
-__xfs_file_write(
+xfs_file_aio_write(
struct kiocb *iocb,
const struct iovec *iov,
unsigned long nr_segs,
- int ioflags,
loff_t pos)
{
- struct file *file = iocb->ki_filp;
+ struct file *file = iocb->ki_filp;
+ int ioflags = IO_ISAIO;
BUG_ON(iocb->ki_pos != pos);
if (unlikely(file->f_flags & O_DIRECT))
ioflags |= IO_ISDIRECT;
+ if (file->f_mode & FMODE_NOCMTIME)
+ ioflags |= IO_INVIS;
return xfs_write(XFS_I(file->f_mapping->host), iocb, iov, nr_segs,
&iocb->ki_pos, ioflags);
}
STATIC ssize_t
-xfs_file_aio_write(
- struct kiocb *iocb,
- const struct iovec *iov,
- unsigned long nr_segs,
- loff_t pos)
-{
- return __xfs_file_write(iocb, iov, nr_segs, IO_ISAIO, pos);
-}
-
-STATIC ssize_t
-xfs_file_aio_write_invis(
- struct kiocb *iocb,
- const struct iovec *iov,
- unsigned long nr_segs,
- loff_t pos)
-{
- return __xfs_file_write(iocb, iov, nr_segs, IO_ISAIO|IO_INVIS, pos);
-}
-
-STATIC ssize_t
xfs_file_splice_read(
struct file *infilp,
loff_t *ppos,
@@ -127,20 +91,13 @@ xfs_file_splice_read(
size_t len,
unsigned int flags)
{
- return xfs_splice_read(XFS_I(infilp->f_path.dentry->d_inode),
- infilp, ppos, pipe, len, flags, 0);
-}
+ int ioflags = 0;
+
+ if (infilp->f_mode & FMODE_NOCMTIME)
+ ioflags |= IO_INVIS;
-STATIC ssize_t
-xfs_file_splice_read_invis(
- struct file *infilp,
- loff_t *ppos,
- struct pipe_inode_info *pipe,
- size_t len,
- unsigned int flags)
-{
return xfs_splice_read(XFS_I(infilp->f_path.dentry->d_inode),
- infilp, ppos, pipe, len, flags, IO_INVIS);
+ infilp, ppos, pipe, len, flags, ioflags);
}
STATIC ssize_t
@@ -151,20 +108,13 @@ xfs_file_splice_write(
size_t len,
unsigned int flags)
{
- return xfs_splice_write(XFS_I(outfilp->f_path.dentry->d_inode),
- pipe, outfilp, ppos, len, flags, 0);
-}
+ int ioflags = 0;
+
+ if (outfilp->f_mode & FMODE_NOCMTIME)
+ ioflags |= IO_INVIS;
-STATIC ssize_t
-xfs_file_splice_write_invis(
- struct pipe_inode_info *pipe,
- struct file *outfilp,
- loff_t *ppos,
- size_t len,
- unsigned int flags)
-{
return xfs_splice_write(XFS_I(outfilp->f_path.dentry->d_inode),
- pipe, outfilp, ppos, len, flags, IO_INVIS);
+ pipe, outfilp, ppos, len, flags, ioflags);
}
STATIC int
@@ -275,42 +225,6 @@ xfs_file_mmap(
return 0;
}
-STATIC long
-xfs_file_ioctl(
- struct file *filp,
- unsigned int cmd,
- unsigned long p)
-{
- struct inode *inode = filp->f_path.dentry->d_inode;
-
-
- /* NOTE: some of the ioctl's return positive #'s as a
- * byte count indicating success, such as
- * readlink_by_handle. So we don't "sign flip"
- * like most other routines. This means true
- * errors need to be returned as a negative value.
- */
- return xfs_ioctl(XFS_I(inode), filp, 0, cmd, (void __user *)p);
-}
-
-STATIC long
-xfs_file_ioctl_invis(
- struct file *filp,
- unsigned int cmd,
- unsigned long p)
-{
- struct inode *inode = filp->f_path.dentry->d_inode;
-
-
- /* NOTE: some of the ioctl's return positive #'s as a
- * byte count indicating success, such as
- * readlink_by_handle. So we don't "sign flip"
- * like most other routines. This means true
- * errors need to be returned as a negative value.
- */
- return xfs_ioctl(XFS_I(inode), filp, IO_INVIS, cmd, (void __user *)p);
-}
-
/*
* mmap()d file has taken write protection fault and is being made
* writable. We can set the page state up correctly for a writable
@@ -346,25 +260,6 @@ const struct file_operations xfs_file_op
#endif
};
-const struct file_operations xfs_invis_file_operations = {
- .llseek = generic_file_llseek,
- .read = do_sync_read,
- .write = do_sync_write,
- .aio_read = xfs_file_aio_read_invis,
- .aio_write = xfs_file_aio_write_invis,
- .splice_read = xfs_file_splice_read_invis,
- .splice_write = xfs_file_splice_write_invis,
- .unlocked_ioctl = xfs_file_ioctl_invis,
-#ifdef CONFIG_COMPAT
- .compat_ioctl = xfs_file_compat_invis_ioctl,
-#endif
- .mmap = xfs_file_mmap,
- .open = xfs_file_open,
- .release = xfs_file_release,
- .fsync = xfs_file_fsync,
-};
-
-
const struct file_operations xfs_dir_file_operations = {
.open = xfs_dir_open,
.read = generic_read_dir,
Index: xfs/fs/xfs/linux-2.6/xfs_ioctl.c
===================================================================
--- xfs.orig/fs/xfs/linux-2.6/xfs_ioctl.c 2008-12-03 18:30:14.000000000 +0100
+++ xfs/fs/xfs/linux-2.6/xfs_ioctl.c 2008-12-03 18:30:34.000000000 +0100
@@ -319,10 +319,11 @@ xfs_open_by_handle(
put_unused_fd(new_fd);
return -XFS_ERROR(-PTR_ERR(filp));
}
+
if (inode->i_mode & S_IFREG) {
/* invisible operation should not change atime */
filp->f_flags |= O_NOATIME;
- filp->f_op = &xfs_invis_file_operations;
+ filp->f_mode |= FMODE_NOCMTIME;
}
fd_install(new_fd, filp);
@@ -1328,21 +1329,31 @@ xfs_ioc_getbmapx(
return 0;
}
-int
-xfs_ioctl(
- xfs_inode_t *ip,
+/*
+ * Note: some of the ioctl's return positive numbers as a
+ * byte count indicating success, such as readlink_by_handle.
+ * So we don't "sign flip" like most other routines. This means
+ * true errors need to be returned as a negative value.
+ */
+long
+xfs_file_ioctl(
struct file *filp,
- int ioflags,
unsigned int cmd,
- void __user *arg)
+ unsigned long p)
{
struct inode *inode = filp->f_path.dentry->d_inode;
- xfs_mount_t *mp = ip->i_mount;
+ struct xfs_inode *ip = XFS_I(inode);
+ struct xfs_mount *mp = ip->i_mount;
+ void __user *arg = (void __user *)p;
+ int ioflags = 0;
int error;
- xfs_itrace_entry(XFS_I(inode));
- switch (cmd) {
+ if (filp->f_mode & FMODE_NOCMTIME)
+ ioflags |= IO_INVIS;
+ xfs_itrace_entry(ip);
+
+ switch (cmd) {
case XFS_IOC_ALLOCSP:
case XFS_IOC_FREESP:
case XFS_IOC_RESVSP:
Index: xfs/fs/xfs/linux-2.6/xfs_iops.h
===================================================================
--- xfs.orig/fs/xfs/linux-2.6/xfs_iops.h 2008-12-03 18:30:14.000000000 +0100
+++ xfs/fs/xfs/linux-2.6/xfs_iops.h 2008-12-03 18:30:34.000000000 +0100
@@ -22,7 +22,6 @@ struct xfs_inode;
extern const struct file_operations xfs_file_operations;
extern const struct file_operations xfs_dir_file_operations;
-extern const struct file_operations xfs_invis_file_operations;
extern ssize_t xfs_vn_listxattr(struct dentry *, char *data, size_t size);
Index: xfs/include/linux/fs.h
===================================================================
--- xfs.orig/include/linux/fs.h 2008-12-03 18:30:14.000000000 +0100
+++ xfs/include/linux/fs.h 2008-12-03 18:31:58.000000000 +0100
@@ -81,6 +81,14 @@ extern int dir_notify_enable;
#define FMODE_WRITE_IOCTL ((__force fmode_t)128)
#define FMODE_NDELAY_NOW ((__force fmode_t)256)
+/*
+ * Don't update ctime and mtime.
+ *
+ * Currently a special hack for the XFS open_by_handle ioctl, but we'll
+ * hopefully graduate it to a proper O_CMTIME flag supported by open(2) soon.
+ */
+#define FMODE_NOCMTIME ((__force fmode_t)2048)
+
#define RW_MASK 1
#define RWA_MASK 2
#define READ 0
Index: xfs/fs/xfs/linux-2.6/xfs_ioctl.h
===================================================================
--- xfs.orig/fs/xfs/linux-2.6/xfs_ioctl.h 2008-12-03 18:30:14.000000000 +0100
+++ xfs/fs/xfs/linux-2.6/xfs_ioctl.h 2008-12-03 18:30:34.000000000 +0100
@@ -68,13 +68,13 @@ xfs_attrmulti_attr_remove(
__uint32_t flags);
extern long
-xfs_file_compat_ioctl(
- struct file *file,
+xfs_file_ioctl(
+ struct file *filp,
unsigned int cmd,
- unsigned long arg);
+ unsigned long p);
extern long
-xfs_file_compat_ioctl_invis(
+xfs_file_compat_ioctl(
struct file *file,
unsigned int cmd,
unsigned long arg);
Index: xfs/fs/xfs/xfs_vnodeops.h
===================================================================
--- xfs.orig/fs/xfs/xfs_vnodeops.h 2008-12-03 18:30:14.000000000 +0100
+++ xfs/fs/xfs/xfs_vnodeops.h 2008-12-03 18:30:34.000000000 +0100
@@ -53,8 +53,6 @@ int xfs_attr_set(struct xfs_inode *dp, c
int xfs_attr_remove(struct xfs_inode *dp, const char *name, int flags);
int xfs_attr_list(struct xfs_inode *dp, char *buffer, int bufsize,
int flags, struct attrlist_cursor_kern *cursor);
-int xfs_ioctl(struct xfs_inode *ip, struct file *filp,
- int ioflags, unsigned int cmd, void __user *arg);
ssize_t xfs_read(struct xfs_inode *ip, struct kiocb *iocb,
const struct iovec *iovp, unsigned int segs,
loff_t *offset, int ioflags);
--
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