2 files changed, 82 insertions, 0 deletions

diff --git a/include/linux/fiemap.h b/include/linux/fiemap.h
new file mode 100644
index 000000000000..671decbd2aeb
--- /dev/null
+++ b/include/linux/fiemap.h
@@ -0,0 +1,64 @@
+/*
+ * FS_IOC_FIEMAP ioctl infrastructure.
+ *
+ * Some portions copyright (C) 2007 Cluster File Systems, Inc
+ *
+ * Authors: Mark Fasheh <mfasheh@suse.com>
+ *          Kalpak Shah <kalpak.shah@sun.com>
+ *          Andreas Dilger <adilger@sun.com>
+ */
+
+#ifndef _LINUX_FIEMAP_H
+#define _LINUX_FIEMAP_H
+
+struct fiemap_extent {
+        __u64 fe_logical;  /* logical offset in bytes for the start of
+                            * the extent from the beginning of the file */
+        __u64 fe_physical; /* physical offset in bytes for the start
+                            * of the extent from the beginning of the disk */
+        __u64 fe_length;   /* length in bytes for this extent */
+        __u64 fe_reserved64[2];
+        __u32 fe_flags;    /* FIEMAP_EXTENT_* flags for this extent */
+        __u32 fe_reserved[3];
+};
+
+struct fiemap {
+        __u64 fm_start;         /* logical offset (inclusive) at
+                                 * which to start mapping (in) */
+        __u64 fm_length;        /* logical length of mapping which
+                                 * userspace wants (in) */
+        __u32 fm_flags;         /* FIEMAP_FLAG_* flags for request (in/out) */
+        __u32 fm_mapped_extents;/* number of extents that were mapped (out) */
+        __u32 fm_extent_count;  /* size of fm_extents array (in) */
+        __u32 fm_reserved;
+        struct fiemap_extent fm_extents[0]; /* array of mapped extents (out) */
+};
+
+#define FIEMAP_MAX_OFFSET       (~0ULL)
+
+#define FIEMAP_FLAG_SYNC        0x00000001 /* sync file data before map */
+#define FIEMAP_FLAG_XATTR       0x00000002 /* map extended attribute tree */
+
+#define FIEMAP_FLAGS_COMPAT     (FIEMAP_FLAG_SYNC | FIEMAP_FLAG_XATTR)
+
+#define FIEMAP_EXTENT_LAST              0x00000001 /* Last extent in file. */
+#define FIEMAP_EXTENT_UNKNOWN           0x00000002 /* Data location unknown. */
+#define FIEMAP_EXTENT_DELALLOC          0x00000004 /* Location still pending.
+                                                    * Sets EXTENT_UNKNOWN. */
+#define FIEMAP_EXTENT_ENCODED           0x00000008 /* Data can not be read
+                                                    * while fs is unmounted */
+#define FIEMAP_EXTENT_DATA_ENCRYPTED    0x00000080 /* Data is encrypted by fs.
+                                                    * Sets EXTENT_NO_BYPASS. */
+#define FIEMAP_EXTENT_NOT_ALIGNED       0x00000100 /* Extent offsets may not be
+                                                    * block aligned. */
+#define FIEMAP_EXTENT_DATA_INLINE       0x00000200 /* Data mixed with metadata.
+                                                    * Sets EXTENT_NOT_ALIGNED.*/
+#define FIEMAP_EXTENT_DATA_TAIL         0x00000400 /* Multiple files in block.
+                                                    * Sets EXTENT_NOT_ALIGNED.*/
+#define FIEMAP_EXTENT_UNWRITTEN         0x00000800 /* Space allocated, but
+                                                    * no data (i.e. zero). */
+#define FIEMAP_EXTENT_MERGED            0x00001000 /* File does not natively
+                                                    * support extents. Result
+                                                    * merged for efficiency. */
+
+#endif /* _LINUX_FIEMAP_H */
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 580b513668fe..194fb237a307 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -231,6 +231,7 @@ 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', 11, 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)
@@ -291,6 +292,7 @@ extern int dir_notify_enable;
 #include <linux/mutex.h>
 #include <linux/capability.h>
 #include <linux/semaphore.h>
+#include <linux/fiemap.h>
 
 #include <asm/atomic.h>
 #include <asm/byteorder.h>
@@ -1179,6 +1181,20 @@ extern void dentry_unhash(struct dentry *dentry);
 extern int file_permission(struct file *, int);
 
 /*
+ * VFS FS_IOC_FIEMAP helper definitions.
+ */
+struct fiemap_extent_info {
+        unsigned int fi_flags;          /* Flags as passed from user */
+        unsigned int fi_extents_mapped; /* Number of mapped extents */
+        unsigned int fi_extents_max;    /* Size of fiemap_extent array */
+        struct fiemap_extent *fi_extents_start; /* Start of fiemap_extent
+                                                 * array */
+};
+int fiemap_fill_next_extent(struct fiemap_extent_info *info, u64 logical,
+                            u64 phys, u64 len, u32 flags);
+int fiemap_check_flags(struct fiemap_extent_info *fieinfo, u32 fs_flags);
+
+/*
  * File types
  *
  * NOTE! These match bits 12..15 of stat.st_mode
@@ -1287,6 +1303,8 @@ 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 *, struct fiemap_extent_info *, u64 start,
+                      u64 len);
 };
 
 struct seq_file;