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| About site: http://tldp.org/HOWTO/SCSI-Generic-HOWTO/ |
Title: Hardware/Buses/SCSI - The Linux SCSI (sg) Generic HOWTO Describes the SCSI Generic driver (sg) found in the Linux 2.4 production series of kernels, focusing on the interface and characteristics of the driver for application writers.
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| On-Line_Extraction_of_SCSI_Disk_Drive_Parameters This report describes a suite of general-purpose techniques and algorithms for acquiring the necessary data from SCSI disks via the ANSI-standard interface. (choose a download format) | | Reference_Charts Tables with: SCSI bus width/maximum data rates, maximum bus length with device addressing, cable lengths meters/feet and SCSI technologies comparison of maximums. From SCSI Masters.com. | | SCSI From Wolfgang Schulte's SCSI information guide. | | SCSI_Common_Codes_and_Values Informative summaries for several of the more commonly used codes and coded values are included as annex information in the SCSI Primary Commands - 2 (SPC-2) draft standard. | | SCSI_Positioning_Paper SCSI is seen as the total solution and will maintain its position as the I/O technology of choice for future enterprise computing, Internet computing and desktop applications, interesting article from | | SCSI-3_Standards_Architecture Chart reflects the currently approved SCSI-3 project family. All projects are in T10, except Fibre Channel is in T11 and 1394 is in IEEE. |
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| The Linux SCSI Generic (sg) HOWTOThe Linux SCSI Generic (sg) HOWTODouglas Gilbert dgilbert@interlog.com Copyright © 2001, 2002 by Douglas Gilbert2002-05-03Revision HistoryRevision 1.22002-05-03Revised by: dpgENOMEM, EPERM; DRIVER_SENSE->CHECK_CONDITIONRevision 1.12002-01-26Revised by: dpgcorrections, host_status, odd dxfer_lenRevision 1.02001-12-21Revised by: dpgoriginal, displace SCSI-PROGRAMMING-HOWTO This HOWTO describes the SCSI Generic driver (sg) found in the Linux 2.4 production series of kernels. It focuses on the the interface and characteristics of the driver that application writers may need to know. The driver's theory of operations is covered and some brief examples are included. Table of Contents1. Introduction2. What the sg driver does3. Identifying the version of the SG driver4. Interface5. Theory of operation6. The sg_io_hdr_t structure in detail6.1. interface_id6.2. dxfer_direction6.3. cmd_len6.4. mx_sb_len6.5. iovec_count6.6. dxfer_len6.7. dxferp6.8. cmdp6.9. sbp6.10. timeout6.11. flags6.12. pack_id6.13. usr_ptr6.14. status6.15. masked_status6.16. msg_status6.17. sb_len_wr6.18. host_status6.19. driver_status6.20. resid6.21. duration6.22. info7. System calls7.1. open()7.2. write()7.3. read()7.4. poll()7.5. close()7.6. mmap()7.7. fcntl(sg_fd, F_SETFL, oflags | FASYNC)7.8. Errors reported in errno8. Ioctl()s8.1. SG_IO8.2. SG_GET_ACCESS_COUNT8.3. SG_SET_COMMAND_Q (and _GET_)8.4. SG_SET_DEBUG8.5. SG_EMULATED_HOST8.6. SG_SET_KEEP_ORPHAN (and _GET_)8.7. SG_SET_FORCE_LOW_DMA8.8. SG_GET_LOW_DMA8.9. SG_NEXT_CMD_LEN8.10. SG_GET_NUM_WAITING8.11. SG_SET_FORCE_PACK_ID8.12. SG_GET_PACK_ID8.13. SG_GET_REQUEST_TABLE8.14. SG_SET_RESERVED_SIZE (and _GET_ )8.15. SG_SCSI_RESET8.16. SG_GET_SCSI_ID8.17. SG_GET_SG_TABLESIZE8.18. SG_GET_TIMEOUT8.19. SG_SET_TIMEOUT8.20. SG_SET_TRANSFORM8.21. SG_GET_TRANSFORM8.22. Sg ioctls removed in version 38.23. SCSI_IOCTL_GET_IDLUN8.24. SCSI_IOCTL_GET_PCI8.25. SCSI_IOCTL_PROBE_HOST8.26. SCSI_IOCTL_SEND_COMMAND9. Direct and Mmap-ed IO9.1. Direct IO9.2. Mmap-ed IO10. Driver and module initialization11. Sg and the "proc" file system11.1. /proc/scsi/sg/debug12. Asynchronous usage of sgA. Sg3_utils packageB. sg_header, the original sg control structureC. Programming exampleD. DebuggingE. Other references Next Introduction |
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Describes | the | SCSI | Generic | driver | (sg) | found | in | the | Linux | 2.4 | production | series | of | kernels, | focusing | on | | the | interface | and | characteristics | of | the | driver | for | application | writers. |
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Describes the SCSI Generic driver (sg) found in the Linux 2.4 production series of kernels, focusing on the interface and characteristics of the driver for application writers.
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