Query File System Alignment
In SMB3 it is now possible to query the file system
alignment info, and the preferred (for performance)
sector size and whether the underlying disk
has no seek penalty (like SSD).
Query this information at mount time for SMB3,
and make it visible in /proc/fs/cifs/DebugData
for debugging purposes.
This alignment information and preferred sector
size info will be helpful for the copy offload
patches to setup the right chunks in the CopyChunk
requests. Presumably the knowledge that the
underlying disk is SSD could also help us
make better readahead and writebehind
decisions (something to look at in the future).
Signed-off-by: Steve French <smfrench@gmail.com>
diff --git a/fs/cifs/smb2pdu.h b/fs/cifs/smb2pdu.h
index c7c3c82..7e44f18 100644
--- a/fs/cifs/smb2pdu.h
+++ b/fs/cifs/smb2pdu.h
@@ -877,14 +877,16 @@
/* File System Information Classes */
#define FS_VOLUME_INFORMATION 1 /* Query */
-#define FS_LABEL_INFORMATION 2 /* Set */
+#define FS_LABEL_INFORMATION 2 /* Local only */
#define FS_SIZE_INFORMATION 3 /* Query */
#define FS_DEVICE_INFORMATION 4 /* Query */
#define FS_ATTRIBUTE_INFORMATION 5 /* Query */
#define FS_CONTROL_INFORMATION 6 /* Query, Set */
#define FS_FULL_SIZE_INFORMATION 7 /* Query */
#define FS_OBJECT_ID_INFORMATION 8 /* Query, Set */
-#define FS_DRIVER_PATH_INFORMATION 9 /* Query */
+#define FS_DRIVER_PATH_INFORMATION 9 /* Local only */
+#define FS_VOLUME_FLAGS_INFORMATION 10 /* Local only */
+#define FS_SECTOR_SIZE_INFORMATION 11 /* SMB3 or later. Query */
struct smb2_fs_full_size_info {
__le64 TotalAllocationUnits;
@@ -894,6 +896,22 @@
__le32 BytesPerSector;
} __packed;
+#define SSINFO_FLAGS_ALIGNED_DEVICE 0x00000001
+#define SSINFO_FLAGS_PARTITION_ALIGNED_ON_DEVICE 0x00000002
+#define SSINFO_FLAGS_NO_SEEK_PENALTY 0x00000004
+#define SSINFO_FLAGS_TRIM_ENABLED 0x00000008
+
+/* sector size info struct */
+struct smb3_fs_ss_info {
+ __le32 LogicalBytesPerSector;
+ __le32 PhysicalBytesPerSectorForAtomicity;
+ __le32 PhysicalBytesPerSectorForPerf;
+ __le32 FileSystemEffectivePhysicalBytesPerSectorForAtomicity;
+ __le32 Flags;
+ __le32 ByteOffsetForSectorAlignment;
+ __le32 ByteOffsetForPartitionAlignment;
+} __packed;
+
/* partial list of QUERY INFO levels */
#define FILE_DIRECTORY_INFORMATION 1
#define FILE_FULL_DIRECTORY_INFORMATION 2