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scsi: remove the SCSI OSD library
Now that all the users are gone the SCSI OSD library can be removed as well. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Christoph Hellwig
committed by
Martin K. Petersen
Martin K. Petersen
parent
80f2121380
commit
19fcae3d4f
@@ -1,192 +0,0 @@
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The OSD Standard
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================
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OSD (Object-Based Storage Device) is a T10 SCSI command set that is designed
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to provide efficient operation of input/output logical units that manage the
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allocation, placement, and accessing of variable-size data-storage containers,
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called objects. Objects are intended to contain operating system and application
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constructs. Each object has associated attributes attached to it, which are
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integral part of the object and provide metadata about the object. The standard
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defines some common obligatory attributes, but user attributes can be added as
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needed.
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See: http://www.t10.org/ftp/t10/drafts/osd2/ for the latest draft for OSD 2
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or search the web for "OSD SCSI"
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OSD in the Linux Kernel
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=======================
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osd-initiator:
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The main component of OSD in Kernel is the osd-initiator library. Its main
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user is intended to be the pNFS-over-objects layout driver, which uses objects
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as its back-end data storage. Other clients are the other osd parts listed below.
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osd-uld:
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This is a SCSI ULD that registers for OSD type devices and provides a testing
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platform, both for the in-kernel initiator as well as connected targets. It
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currently has no useful user-mode API, though it could have if need be.
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osd target:
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There are no current plans for an OSD target implementation in kernel. For all
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needs, a user-mode target that is based on the scsi tgt target framework is
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available from Ohio Supercomputer Center (OSC) at:
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http://www.open-osd.org/bin/view/Main/OscOsdProject
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There are several other target implementations. See http://open-osd.org for more
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links.
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Files and Folders
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=================
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This is the complete list of files included in this work:
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include/scsi/
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osd_initiator.h Main API for the initiator library
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osd_types.h Common OSD types
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osd_sec.h Security Manager API
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osd_protocol.h Wire definitions of the OSD standard protocol
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osd_attributes.h Wire definitions of OSD attributes
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drivers/scsi/osd/
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osd_initiator.c OSD-Initiator library implementation
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osd_uld.c The OSD scsi ULD
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osd_ktest.{h,c} In-kernel test suite (called by osd_uld)
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osd_debug.h Some printk macros
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Makefile For both in-tree and out-of-tree compilation
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Kconfig Enables inclusion of the different pieces
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osd_test.c User-mode application to call the kernel tests
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The OSD-Initiator Library
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=========================
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osd_initiator is a low level implementation of an osd initiator encoder.
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But even though, it should be intuitive and easy to use. Perhaps over time an
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higher lever will form that automates some of the more common recipes.
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init/fini:
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- osd_dev_init() associates a scsi_device with an osd_dev structure
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and initializes some global pools. This should be done once per scsi_device
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(OSD LUN). The osd_dev structure is needed for calling osd_start_request().
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- osd_dev_fini() cleans up before a osd_dev/scsi_device destruction.
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OSD commands encoding, execution, and decoding of results:
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struct osd_request's is used to iteratively encode an OSD command and carry
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its state throughout execution. Each request goes through these stages:
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a. osd_start_request() allocates the request.
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b. Any of the osd_req_* methods is used to encode a request of the specified
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type.
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c. osd_req_add_{get,set}_attr_* may be called to add get/set attributes to the
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CDB. "List" or "Page" mode can be used exclusively. The attribute-list API
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can be called multiple times on the same request. However, only one
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attribute-page can be read, as mandated by the OSD standard.
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d. osd_finalize_request() computes offsets into the data-in and data-out buffers
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and signs the request using the provided capability key and integrity-
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check parameters.
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e. osd_execute_request() may be called to execute the request via the block
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layer and wait for its completion. The request can be executed
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asynchronously by calling the block layer API directly.
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f. After execution, osd_req_decode_sense() can be called to decode the request's
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sense information.
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g. osd_req_decode_get_attr() may be called to retrieve osd_add_get_attr_list()
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values.
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h. osd_end_request() must be called to deallocate the request and any resource
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associated with it. Note that osd_end_request cleans up the request at any
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stage and it must always be called after a successful osd_start_request().
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osd_request's structure:
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The OSD standard defines a complex structure of IO segments pointed to by
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members in the CDB. Up to 3 segments can be deployed in the IN-Buffer and up to
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4 in the OUT-Buffer. The ASCII illustration below depicts a secure-read with
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associated get+set of attributes-lists. Other combinations very on the same
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basic theme. From no-segments-used up to all-segments-used.
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|________OSD-CDB__________|
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| |
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|read_len (offset=0) -|---------\
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| | |
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|get_attrs_list_length | |
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|get_attrs_list_offset -|----\ |
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| | | |
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|retrieved_attrs_alloc_len| | |
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|retrieved_attrs_offset -|----|----|-\
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| | | | |
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|set_attrs_list_length | | | |
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|set_attrs_list_offset -|-\ | | |
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| | | | | |
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|in_data_integ_offset -|-|--|----|-|-\
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|out_data_integ_offset -|-|--|--\ | | |
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\_________________________/ | | | | | |
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| | | | | |
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|_______OUT-BUFFER________| | | | | | |
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| Set attr list |</ | | | | |
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| | | | | | |
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|-------------------------| | | | | |
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| Get attr descriptors |<---/ | | | |
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| | | | | |
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|-------------------------| | | | |
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| Out-data integrity |<------/ | | |
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\_________________________/ | | |
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| | |
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|________IN-BUFFER________| | | |
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| In-Data read |<--------/ | |
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| | | |
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|-------------------------| | |
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| Get attr list |<----------/ |
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| | |
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|-------------------------| |
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| In-data integrity |<------------/
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| |
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\_________________________/
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A block device request can carry bidirectional payload by means of associating
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a bidi_read request with a main write-request. Each in/out request is described
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by a chain of BIOs associated with each request.
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The CDB is of a SCSI VARLEN CDB format, as described by OSD standard.
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The OSD standard also mandates alignment restrictions at start of each segment.
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In the code, in struct osd_request, there are two _osd_io_info structures to
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describe the IN/OUT buffers above, two BIOs for the data payload and up to five
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_osd_req_data_segment structures to hold the different segments allocation and
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information.
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Important: We have chosen to disregard the assumption that a BIO-chain (and
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the resulting sg-list) describes a linear memory buffer. Meaning only first and
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last scatter chain can be incomplete and all the middle chains are of PAGE_SIZE.
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For us, a scatter-gather-list, as its name implies and as used by the Networking
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layer, is to describe a vector of buffers that will be transferred to/from the
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wire. It works very well with current iSCSI transport. iSCSI is currently the
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only deployed OSD transport. In the future we anticipate SAS and FC attached OSD
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devices as well.
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The OSD Testing ULD
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===================
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TODO: More user-mode control on tests.
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Authors, Mailing list
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=====================
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Please communicate with us on any deployment of osd, whether using this code
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or not.
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Any problems, questions, bug reports, lonely OSD nights, please email:
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OSD Dev List <osd-dev@open-osd.org>
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More up-to-date information can be found on:
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http://open-osd.org
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Boaz Harrosh <ooo@electrozaur.com>
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References
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==========
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Weber, R., "SCSI Object-Based Storage Device Commands",
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T10/1355-D ANSI/INCITS 400-2004,
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http://www.t10.org/ftp/t10/drafts/osd/osd-r10.pdf
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Weber, R., "SCSI Object-Based Storage Device Commands -2 (OSD-2)"
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T10/1729-D, Working Draft, rev. 3
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http://www.t10.org/ftp/t10/drafts/osd2/osd2r03.pdf
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@@ -11385,12 +11385,6 @@ W: http://www.nongnu.org/orinoco/
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S: Orphan
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F: drivers/net/wireless/intersil/orinoco/
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OSD LIBRARY and FILESYSTEM
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M: Boaz Harrosh <ooo@electrozaur.com>
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S: Maintained
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F: drivers/scsi/osd/
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F: include/scsi/osd_*
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OV2659 OMNIVISION SENSOR DRIVER
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M: "Lad, Prabhakar" <prabhakar.csengg@gmail.com>
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L: linux-media@vger.kernel.org
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@@ -1515,6 +1515,4 @@ source "drivers/scsi/pcmcia/Kconfig"
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source "drivers/scsi/device_handler/Kconfig"
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source "drivers/scsi/osd/Kconfig"
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endmenu
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@@ -150,7 +150,6 @@ obj-$(CONFIG_CHR_DEV_SG) += sg.o
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obj-$(CONFIG_CHR_DEV_SCH) += ch.o
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obj-$(CONFIG_SCSI_ENCLOSURE) += ses.o
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obj-$(CONFIG_SCSI_OSD_INITIATOR) += osd/
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obj-$(CONFIG_SCSI_HISI_SAS) += hisi_sas/
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# This goes last, so that "real" scsi devices probe earlier
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@@ -1,20 +0,0 @@
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#
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# Kbuild for the OSD modules
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#
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# Copyright (C) 2008 Panasas Inc. All rights reserved.
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#
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# Authors:
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# Boaz Harrosh <ooo@electrozaur.com>
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# Benny Halevy <bhalevy@panasas.com>
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License version 2
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#
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# libosd.ko - osd-initiator library
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libosd-y := osd_initiator.o
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obj-$(CONFIG_SCSI_OSD_INITIATOR) += libosd.o
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# osd.ko - SCSI ULD and char-device
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osd-y := osd_uld.o
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obj-$(CONFIG_SCSI_OSD_ULD) += osd.o
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@@ -1,49 +0,0 @@
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#
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# Kernel configuration file for the OSD scsi protocol
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#
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# Copyright (C) 2008 Panasas Inc. All rights reserved.
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#
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# Authors:
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# Boaz Harrosh <ooo@electrozaur.com>
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# Benny Halevy <bhalevy@panasas.com>
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public version 2 License as
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# published by the Free Software Foundation
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#
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config SCSI_OSD_INITIATOR
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tristate "OSD-Initiator library"
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depends on SCSI
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help
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Enable the OSD-Initiator library (libosd.ko).
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NOTE: You must also select CRYPTO_SHA1 + CRYPTO_HMAC and their
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dependencies
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config SCSI_OSD_ULD
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tristate "OSD Upper Level driver"
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depends on SCSI_OSD_INITIATOR
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help
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Build a SCSI upper layer driver that exports /dev/osdX devices
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to user-mode for testing and controlling OSD devices. It is also
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needed by exofs, for mounting an OSD based file system.
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config SCSI_OSD_DPRINT_SENSE
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int "(0-2) When sense is returned, DEBUG print all sense descriptors"
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default 1
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depends on SCSI_OSD_INITIATOR
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help
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When a CHECK_CONDITION status is returned from a target, and a
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sense-buffer is retrieved, turning this on will dump a full
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sense-decoding message. Setting to 2 will also print recoverable
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errors that might be regularly returned for some filesystem
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operations.
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config SCSI_OSD_DEBUG
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bool "Compile All OSD modules with lots of DEBUG prints"
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default n
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depends on SCSI_OSD_INITIATOR
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help
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OSD Code is populated with lots of OSD_DEBUG(..) printouts to
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dmesg. Enable this if you found a bug and you want to help us
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track the problem (see also MAINTAINERS). Setting this will also
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force SCSI_OSD_DPRINT_SENSE=2.
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@@ -1,30 +0,0 @@
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/*
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* osd_debug.h - Some kprintf macros
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*
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* Copyright (C) 2008 Panasas Inc. All rights reserved.
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*
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* Authors:
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* Boaz Harrosh <ooo@electrozaur.com>
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* Benny Halevy <bhalevy@panasas.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2
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*
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*/
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#ifndef __OSD_DEBUG_H__
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#define __OSD_DEBUG_H__
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#define OSD_ERR(fmt, a...) printk(KERN_ERR "osd: " fmt, ##a)
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#define OSD_INFO(fmt, a...) printk(KERN_NOTICE "osd: " fmt, ##a)
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#ifdef CONFIG_SCSI_OSD_DEBUG
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#define OSD_DEBUG(fmt, a...) \
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printk(KERN_NOTICE "osd @%s:%d: " fmt, __func__, __LINE__, ##a)
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#else
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#define OSD_DEBUG(fmt, a...) do {} while (0)
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#endif
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/* u64 has problems with printk this will cast it to unsigned long long */
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#define _LLU(x) (unsigned long long)(x)
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#endif /* ndef __OSD_DEBUG_H__ */
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File diff suppressed because it is too large
Load Diff
File diff suppressed because it is too large
Load Diff
File diff suppressed because it is too large
Load Diff
@@ -1,201 +0,0 @@
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/*
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* Copyright (C) 2011
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* Boaz Harrosh <ooo@electrozaur.com>
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*
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* Public Declarations of the ORE API
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*
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* This file is part of the ORE (Object Raid Engine) library.
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*
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* ORE is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation. (GPL v2)
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*
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* ORE is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with the ORE; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef __ORE_H__
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#define __ORE_H__
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#include <scsi/osd_initiator.h>
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#include <scsi/osd_attributes.h>
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#include <scsi/osd_sec.h>
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#include <linux/pnfs_osd_xdr.h>
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#include <linux/bug.h>
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struct ore_comp {
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struct osd_obj_id obj;
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u8 cred[OSD_CAP_LEN];
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};
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struct ore_layout {
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/* Our way of looking at the data_map */
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enum pnfs_osd_raid_algorithm4
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raid_algorithm;
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unsigned stripe_unit;
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unsigned mirrors_p1;
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unsigned group_width;
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unsigned parity;
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u64 group_depth;
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unsigned group_count;
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/* Cached often needed calculations filled in by
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* ore_verify_layout
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*/
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unsigned long max_io_length; /* Max length that should be passed to
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* ore_get_rw_state
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*/
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};
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struct ore_dev {
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struct osd_dev *od;
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};
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struct ore_components {
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unsigned first_dev; /* First logical device no */
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unsigned numdevs; /* Num of devices in array */
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/* If @single_comp == EC_SINGLE_COMP, @comps points to a single
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* component. else there are @numdevs components
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*/
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enum EC_COMP_USAGE {
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EC_SINGLE_COMP = 0, EC_MULTPLE_COMPS = 0xffffffff
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} single_comp;
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struct ore_comp *comps;
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/* Array of pointers to ore_dev-* . User will usually have these pointed
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* too a bigger struct which contain an "ore_dev ored" member and use
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* container_of(oc->ods[i], struct foo_dev, ored) to access the bigger
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* structure.
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*/
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struct ore_dev **ods;
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};
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/* ore_comp_dev Recievies a logical device index */
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static inline struct osd_dev *ore_comp_dev(
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const struct ore_components *oc, unsigned i)
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{
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BUG_ON((i < oc->first_dev) || (oc->first_dev + oc->numdevs <= i));
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return oc->ods[i - oc->first_dev]->od;
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}
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static inline void ore_comp_set_dev(
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struct ore_components *oc, unsigned i, struct osd_dev *od)
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{
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oc->ods[i - oc->first_dev]->od = od;
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}
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struct ore_striping_info {
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u64 offset;
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u64 obj_offset;
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u64 length;
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u64 first_stripe_start; /* only used in raid writes */
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u64 M; /* for truncate */
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unsigned bytes_in_stripe;
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unsigned dev;
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unsigned par_dev;
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unsigned unit_off;
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unsigned cur_pg;
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unsigned cur_comp;
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unsigned maxdevUnits;
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};
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struct ore_io_state;
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typedef void (*ore_io_done_fn)(struct ore_io_state *ios, void *private);
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struct _ore_r4w_op {
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/* @Priv given here is passed ios->private */
|
||||
struct page * (*get_page)(void *priv, u64 page_index, bool *uptodate);
|
||||
void (*put_page)(void *priv, struct page *page);
|
||||
};
|
||||
|
||||
struct ore_io_state {
|
||||
struct kref kref;
|
||||
struct ore_striping_info si;
|
||||
|
||||
void *private;
|
||||
ore_io_done_fn done;
|
||||
|
||||
struct ore_layout *layout;
|
||||
struct ore_components *oc;
|
||||
|
||||
/* Global read/write IO*/
|
||||
loff_t offset;
|
||||
unsigned long length;
|
||||
void *kern_buff;
|
||||
|
||||
struct page **pages;
|
||||
unsigned nr_pages;
|
||||
unsigned pgbase;
|
||||
unsigned pages_consumed;
|
||||
|
||||
/* Attributes */
|
||||
unsigned in_attr_len;
|
||||
struct osd_attr *in_attr;
|
||||
unsigned out_attr_len;
|
||||
struct osd_attr *out_attr;
|
||||
|
||||
bool reading;
|
||||
|
||||
/* House keeping of Parity pages */
|
||||
bool extra_part_alloc;
|
||||
struct page **parity_pages;
|
||||
unsigned max_par_pages;
|
||||
unsigned cur_par_page;
|
||||
unsigned sgs_per_dev;
|
||||
struct __stripe_pages_2d *sp2d;
|
||||
struct ore_io_state *ios_read_4_write;
|
||||
const struct _ore_r4w_op *r4w;
|
||||
|
||||
/* Variable array of size numdevs */
|
||||
unsigned numdevs;
|
||||
struct ore_per_dev_state {
|
||||
struct osd_request *or;
|
||||
struct bio *bio;
|
||||
loff_t offset;
|
||||
unsigned length;
|
||||
unsigned last_sgs_total;
|
||||
unsigned dev;
|
||||
struct osd_sg_entry *sglist;
|
||||
unsigned cur_sg;
|
||||
} per_dev[];
|
||||
};
|
||||
|
||||
static inline unsigned ore_io_state_size(unsigned numdevs)
|
||||
{
|
||||
return sizeof(struct ore_io_state) +
|
||||
sizeof(struct ore_per_dev_state) * numdevs;
|
||||
}
|
||||
|
||||
/* ore.c */
|
||||
int ore_verify_layout(unsigned total_comps, struct ore_layout *layout);
|
||||
void ore_calc_stripe_info(struct ore_layout *layout, u64 file_offset,
|
||||
u64 length, struct ore_striping_info *si);
|
||||
int ore_get_rw_state(struct ore_layout *layout, struct ore_components *comps,
|
||||
bool is_reading, u64 offset, u64 length,
|
||||
struct ore_io_state **ios);
|
||||
int ore_get_io_state(struct ore_layout *layout, struct ore_components *comps,
|
||||
struct ore_io_state **ios);
|
||||
void ore_put_io_state(struct ore_io_state *ios);
|
||||
|
||||
typedef void (*ore_on_dev_error)(struct ore_io_state *ios, struct ore_dev *od,
|
||||
unsigned dev_index, enum osd_err_priority oep,
|
||||
u64 dev_offset, u64 dev_len);
|
||||
int ore_check_io(struct ore_io_state *ios, ore_on_dev_error rep);
|
||||
|
||||
int ore_create(struct ore_io_state *ios);
|
||||
int ore_remove(struct ore_io_state *ios);
|
||||
int ore_write(struct ore_io_state *ios);
|
||||
int ore_read(struct ore_io_state *ios);
|
||||
int ore_truncate(struct ore_layout *layout, struct ore_components *comps,
|
||||
u64 size);
|
||||
|
||||
int extract_attr_from_ios(struct ore_io_state *ios, struct osd_attr *attr);
|
||||
|
||||
extern const struct osd_attr g_attr_logical_length;
|
||||
|
||||
#endif
|
||||
Reference in New Issue
Block a user