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Diffstat (limited to 'Documentation/device-mapper/switch.txt')
| -rw-r--r-- | Documentation/device-mapper/switch.txt | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/Documentation/device-mapper/switch.txt b/Documentation/device-mapper/switch.txt index 2fa749387be8..8897d0494838 100644 --- a/Documentation/device-mapper/switch.txt +++ b/Documentation/device-mapper/switch.txt @@ -106,6 +106,11 @@ which paths. The path number in the range 0 ... (<num_paths> - 1). Expressed in hexadecimal (WITHOUT any prefix like 0x). +R<n>,<m> + This parameter allows repetitive patterns to be loaded quickly. <n> and <m> + are hexadecimal numbers. The last <n> mappings are repeated in the next <m> + slots. + Status ====== @@ -124,3 +129,10 @@ Create a switch device with 64kB region size: Set mappings for the first 7 entries to point to devices switch0, switch1, switch2, switch0, switch1, switch2, switch1: dmsetup message switch 0 set_region_mappings 0:0 :1 :2 :0 :1 :2 :1 + +Set repetitive mapping. This command: + dmsetup message switch 0 set_region_mappings 1000:1 :2 R2,10 +is equivalent to: + dmsetup message switch 0 set_region_mappings 1000:1 :2 :1 :2 :1 :2 :1 :2 \ + :1 :2 :1 :2 :1 :2 :1 :2 :1 :2 + |