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Date: Wed, 26 Mar 2008 10:40:42 -0500
From: Eric Sandeen <sandeen@...hat.com>
To: ext4 development <linux-ext4@...r.kernel.org>
Subject: [PATCH 1/3] vfs-level fiemap interface
Basic vfs-level fiemap infrastructure, which sets up a new
->fiemap inode operation.
Signed-off-by: Eric Sandeen <sandeen@...hat.com>
---
(and I think also signed-off-by Andreas and/or Kalpak as well should
also go here, since it's their work originally.)
Index: linux-2.6.25-rc1/include/linux/fiemap.h
===================================================================
--- /dev/null
+++ linux-2.6.25-rc1/include/linux/fiemap.h
@@ -0,0 +1,49 @@
+/*
+ * FIEMAP ioctl infrastructure.
+ *
+ * Copyright (C) 2007 Cluster File Systems, Inc
+ *
+ * Author: Kalpak Shah <kalpak.shah@....com>
+ * Andreas Dilger <adilger@....com>
+ */
+
+#ifndef _LINUX_FIEMAP_H
+#define _LINUX_FIEMAP_H
+
+struct fiemap_extent {
+ __u64 fe_offset; /* offset in bytes for the start of the extent */
+ __u64 fe_length; /* length in bytes for the extent */
+ __u32 fe_flags; /* returned FIEMAP_EXTENT_* flags for the extent */
+ __u32 fe_lun; /* logical device number for extent (starting at 0)*/
+};
+
+struct fiemap {
+ __u64 fm_start; /* logical starting byte offset (in/out) */
+ __u64 fm_length; /* logical length of map (in/out) */
+ __u32 fm_flags; /* FIEMAP_FLAG_* flags for request (in/out) */
+ __u32 fm_extent_count; /* number of extents in fm_extents (in/out) */
+ __u64 fm_end_offset; /* logical offset of end of mapping in last ioctl (out) */
+ struct fiemap_extent fm_extents[0];
+};
+
+#define FIEMAP_FLAG_SYNC 0x00000001 /* sync file data before map */
+#define FIEMAP_FLAG_HSM_READ 0x00000002 /* get data from HSM before map */
+#define FIEMAP_FLAG_NUM_EXTENTS 0x00000004 /* return only number of extents */
+#define FIEMAP_FLAG_INCOMPAT 0xff000000 /* error for unknown flags in here */
+
+#define FIEMAP_FLAG_LUN_OFFSET 0x01000000 /* use lun offsets, instead of
+ * logical file offsets */
+
+#define FIEMAP_EXTENT_HOLE 0x00000001 /* has no data or space allocation */
+#define FIEMAP_EXTENT_UNWRITTEN 0x00000002 /* space allocated, but no data */
+#define FIEMAP_EXTENT_UNKNOWN 0x00000004 /* in use, location unknown */
+#define FIEMAP_EXTENT_ERROR 0x00000008 /* mapping error, errno in fe_start*/
+#define FIEMAP_EXTENT_NO_DIRECT 0x00000010 /* cannot access data directly */
+#define FIEMAP_EXTENT_LAST 0x00000020 /* last extent in the file */
+#define FIEMAP_EXTENT_DELALLOC 0x00000040 /* has data but not yet written,
+ * must have EXTENT_UNKNOWN set */
+#define FIEMAP_EXTENT_SECONDARY 0x00000080 /* data (also) in secondary storage,
+ * not in primary if EXTENT_UNKNOWN*/
+#define FIEMAP_EXTENT_EOF 0x00000100 /* if fm_start+fm_len is beyond EOF*/
+
+#endif /* _LINUX_FIEMAP_H */
Index: linux-2.6.25-rc1/include/linux/fs.h
===================================================================
--- linux-2.6.25-rc1.orig/include/linux/fs.h
+++ linux-2.6.25-rc1/include/linux/fs.h
@@ -228,6 +228,7 @@ extern int dir_notify_enable;
#define FS_IOC_SETFLAGS _IOW('f', 2, long)
#define FS_IOC_GETVERSION _IOR('v', 1, long)
#define FS_IOC_SETVERSION _IOW('v', 2, long)
+#define FS_IOC_FIEMAP _IOWR('f', 10, struct fiemap)
#define FS_IOC32_GETFLAGS _IOR('f', 1, int)
#define FS_IOC32_SETFLAGS _IOW('f', 2, int)
#define FS_IOC32_GETVERSION _IOR('v', 1, int)
@@ -287,6 +288,7 @@ extern int dir_notify_enable;
#include <linux/pid.h>
#include <linux/mutex.h>
#include <linux/capability.h>
+#include <linux/fiemap.h>
#include <asm/atomic.h>
#include <asm/semaphore.h>
@@ -1223,6 +1225,7 @@ struct inode_operations {
void (*truncate_range)(struct inode *, loff_t, loff_t);
long (*fallocate)(struct inode *inode, int mode, loff_t offset,
loff_t len);
+ int (*fiemap) (struct inode *, unsigned long arg);
};
struct seq_file;
Index: linux-2.6.25-rc1/fs/ioctl.c
===================================================================
--- linux-2.6.25-rc1.orig/fs/ioctl.c
+++ linux-2.6.25-rc1/fs/ioctl.c
@@ -71,6 +71,34 @@ static int ioctl_fibmap(struct file *fil
return put_user(res, p);
}
+static int ioctl_fiemap(struct file *filp, unsigned long arg)
+{
+ struct fiemap fiemap_s;
+ struct inode *inode = filp->f_path.dentry->d_inode;
+ int error = 0;
+
+ if (!inode->i_op->fiemap)
+ return -EOPNOTSUPP;
+
+ if (copy_from_user(&fiemap_s, (struct fiemap __user *)arg,
+ sizeof(struct fiemap)))
+ return -EFAULT;
+
+ /* Need arg sanity checking:
+ * start >= 0? Must be; unsigned.
+ * length > 0? (or is -1 valid?)
+ * extent count non-zero if not FLAG_NUM_EXTENTS
+ */
+
+ /* Should fs do this under a lock? */
+ if (fiemap_s.fm_flags & FIEMAP_FLAG_SYNC)
+ filemap_write_and_wait(inode->i_mapping);
+
+ error = inode->i_op->fiemap(inode, arg);
+
+ return error;
+}
+
static int file_ioctl(struct file *filp, unsigned int cmd,
unsigned long arg)
{
@@ -80,6 +108,8 @@ static int file_ioctl(struct file *filp,
switch (cmd) {
case FIBMAP:
return ioctl_fibmap(filp, p);
+ case FS_IOC_FIEMAP:
+ return ioctl_fiemap(filp, arg);
case FIGETBSZ:
return put_user(inode->i_sb->s_blocksize, p);
case FIONREAD:
--
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