【转】linx 设备名字来由 sd sr sg st
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【转】linx 设备名字来由 sd sr sg st
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轉自：/dev/sr0 與/dev/cdrom_luoweifeng1989的博客-CSDN博客_/dev/sr0
一直不知道?sda sdb sr0 這些名字的前兩兩個字母是什么意思
- >?>?On?Tue,?Nov?3,?2009?at?9:34?AM,?Derek?Broughton??
- >?>?<derek@pointerstop.ca>wrote:??
- >?>?Translation?-?I?don't?know?either...?lol??
- >?Actually,?I'd?already?said?that?-?and?suggested?"raw"?as?a??
- >?wild?guess.?But??
- >?I?was?intrigued?that?Detlef?thought?that?knowing?what?it?stood??
- >?for?would??
- >?prevent?errors,?since?I?really?can't?imagine?how?most?of?us??
- >?would?need?to??
- >?know?it.??
- >?--??
- >?derek??
- >???
- >?And?knowing?the?acronym?definitions?probably?won't?help?the?learning??
- >?too?much,?either.?
- >?But,?according?to?the?Linux?SCSI?sub-system?documentation?I?have,?it??
- >?would?have?to?stand?for?_SCSI_?_READ_?since?it?is?a?cd?drive?that?is??
- >?designated?read-only.?For?generic?operations?on?the?same?device,?it??
- >?would?map?to?sg0?(_SCSI_?_GENERIC_)?in?order?to?gain?the?write?perm.??
- >?Apparently?all?of?the?devices?like?/dev/sr0,?/dev/st0,?/dev/nst0x?map??
- >?to?an?sg?device?for?generic?operations.??
- >?Although?_raw_?seems?to?be?a?good?logical?choice.??
- Lo?c?had?it?right.??
- But?you?should?read?the?code?from?orbit.?It's?the?only?way?to?make?sure.??
- >From?a?2.4?kernel?source??
- drivers/scsi/sd.c??
- static?struct?Scsi_Device_Template?sd_template?=?{???
- name:"disk",??
- tag:"sd",??
- scsi_type:TYPE_DISK,?<==?"d"?for?disk??
- major:SCSI_DISK0_MAJOR,??
- /*?
- *?Secondary?range?of?majors?that?this?driver?handles.?
- */??
- min_major:SCSI_DISK1_MAJOR,??
- max_major:SCSI_DISK7_MAJOR,??
- blk:1,??
- detect:sd_detect,??
- init:sd_init,??
- finish:sd_finish,??
- attach:sd_attach,??
- detach:sd_detach,??
- init_command:sd_init_command,??
- };??
- drivers/scsi/st.c??
- static?struct?Scsi_Device_Template?st_template?=??
- {??
- name:"tape",???
- tag:"st",???
- scsi_type:TYPE_TAPE,?<==?"t"?for?tape??
- major:SCSI_TAPE_MAJOR,???
- detect:st_detect,???
- init:st_init,??
- attach:st_attach,???
- detach:st_detach??
- };??
- drivers/scsi/sr.c??
- static?struct?Scsi_Device_Template?sr_template?=??
- {??
- name:"cdrom",??
- tag:"sr",??
- scsi_type:TYPE_ROM,?<==?"r"?for?ROM??
- major:SCSI_CDROM_MAJOR,??
- blk:1,??
- detect:sr_detect,??
- init:sr_init,??
- finish:sr_finish,??
- attach:sr_attach,??
- detach:sr_detach,??
- init_command:sr_init_command??
- };??
- >From?a?2.6?kernel?source??
- drivers/scsi/sr.c??
- MODULE_DESCRIPTION("SCSI?cdrom?(sr)?driver");???
- MODULE_LICENSE("GPL");??
- MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_CDROM_MAJOR);??
- MODULE_ALIAS_SCSI_DEVICE(TYPE_ROM);??
- MODULE_ALIAS_SCSI_DEVICE(TYPE_WORM);??
- --
- ubuntu-users?mailing?list??
- ubuntu-users@lists.ubuntu.com??
- Modify?settings?or?unsubscribe?at:?https://lists.ubuntu.com/mailman/listinfo/ubuntu-users??
可以看出：
sr代表 scsi + rom
sd代表 scsi + disk
sg 代表 scsi + generic
st代表 scsi + tape
/dev/cdrom 只是/dev/sr0的符號鏈接
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