1. 30 Apr, 2019 1 commit
  2. 06 Feb, 2019 2 commits
  3. 21 Dec, 2018 1 commit
    • Christoph Hellwig's avatar
      bsg: deprecate BIDI support in bsg · 2e5b2d7c
      Christoph Hellwig authored
      Besides the OSD command set that never got traction, the only SCSI
      command using bidirectional buffers is XDWRITEREAD in the 10 and 32 byte
      variants, which is extremely esoteric and has been removed from the spec
      again as of SBC4r15.  It probably doesn't make sense to keep the support
      code around just for that, so start deprecating the support.
      Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
      Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
      2e5b2d7c
  4. 16 Nov, 2018 1 commit
  5. 28 Aug, 2018 1 commit
  6. 12 Jul, 2018 1 commit
    • Christoph Hellwig's avatar
      bsg: remove read/write support · 28519c89
      Christoph Hellwig authored
      The code poses a security risk due to user memory access in ->release
      and had an API that can't be used reliably.  As far as we know it was
      never used for real, but if that turns out wrong we'll have to revert
      this commit and come up with a band aid.
      
      Jann Horn did look software archives for users of this interface,
      and the only users found were example code in sg3_utils, and optional
      support in an optional module of the tgt user space iscsi target,
      which looks like a proof of concept extension of the /dev/sg
      read/write support.
      
      Tony Battersby chimes in that the code is basically unsafe to use in
      general:
      
        The read/write interface on /dev/bsg is impossible to use safely
        because the list of completed commands is per-device (bd->done_list)
        rather than per-fd like it is with /dev/sg.  So if program A and
        program B are both using the write/read interface on the same bsg
        device, then their command responses will get mixed up, and program
        A will read() some command results from program B and vice versa.
        So no, I don't use read/write on /dev/bsg.  From a security standpoint,
        it should definitely be fixed or removed.
      Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
      Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
      28519c89
  7. 11 Jul, 2018 1 commit
  8. 15 Jun, 2018 1 commit
  9. 29 May, 2018 1 commit
  10. 14 May, 2018 1 commit
  11. 13 Mar, 2018 1 commit
    • Christoph Hellwig's avatar
      bsg: split handling of SCSI CDBs vs transport requeues · 17cb960f
      Christoph Hellwig authored
      The current BSG design tries to shoe-horn the transport-specific
      passthrough commands into the overall framework for SCSI passthrough
      requests.  This has a couple problems:
      
       - each passthrough queue has to set the QUEUE_FLAG_SCSI_PASSTHROUGH flag
         despite not dealing with SCSI commands at all.  Because of that these
         queues could also incorrectly accept SCSI commands from in-kernel
         users or through the legacy SCSI_IOCTL_SEND_COMMAND ioctl.
       - the real SCSI bsg queues also incorrectly accept bsg requests of the
         BSG_SUB_PROTOCOL_SCSI_TRANSPORT type
       - the bsg transport code is almost unredable because it tries to reuse
         different SCSI concepts for its own purpose.
      
      This patch instead adds a new bsg_ops structure to handle the two cases
      differently, and thus solves all of the above problems.  Another side
      effect is that the bsg-lib queues also don't need to embedd a
      struct scsi_request anymore.
      Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
      Reviewed-by: default avatarHannes Reinecke <hare@suse.com>
      Reviewed-by: default avatarJohannes Thumshirn <jthumshirn@suse.de>
      Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
      17cb960f
  12. 11 Feb, 2018 1 commit
    • Linus Torvalds's avatar
      vfs: do bulk POLL* -> EPOLL* replacement · a9a08845
      Linus Torvalds authored
      This is the mindless scripted replacement of kernel use of POLL*
      variables as described by Al, done by this script:
      
          for V in IN OUT PRI ERR RDNORM RDBAND WRNORM WRBAND HUP RDHUP NVAL MSG; do
              L=`git grep -l -w POLL$V | grep -v '^t' | grep -v /um/ | grep -v '^sa' | grep -v '/poll.h$'|grep -v '^D'`
              for f in $L; do sed -i "-es/^\([^\"]*\)\(\<POLL$V\>\)/\\1E\\2/" $f; done
          done
      
      with de-mangling cleanups yet to come.
      
      NOTE! On almost all architectures, the EPOLL* constants have the same
      values as the POLL* constants do.  But they keyword here is "almost".
      For various bad reasons they aren't the same, and epoll() doesn't
      actually work quite correctly in some cases due to this on Sparc et al.
      
      The next patch from Al will sort out the final differences, and we
      should be all done.
      Scripted-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      a9a08845
  13. 24 Jan, 2018 1 commit
  14. 27 Nov, 2017 1 commit
  15. 11 Nov, 2017 1 commit
  16. 29 Aug, 2017 1 commit
  17. 21 Jun, 2017 1 commit
    • Bart Van Assche's avatar
      block: Make most scsi_req_init() calls implicit · ca18d6f7
      Bart Van Assche authored
      Instead of explicitly calling scsi_req_init() after blk_get_request(),
      call that function from inside blk_get_request(). Add an
      .initialize_rq_fn() callback function to the block drivers that need
      it. Merge the IDE .init_rq_fn() function into .initialize_rq_fn()
      because it is too small to keep it as a separate function. Keep the
      scsi_req_init() call in ide_prep_sense() because it follows a
      blk_rq_init() call.
      
      References: commit 82ed4db4 ("block: split scsi_request out of struct request")
      Signed-off-by: default avatarBart Van Assche <bart.vanassche@sandisk.com>
      Cc: Christoph Hellwig <hch@lst.de>
      Cc: Hannes Reinecke <hare@suse.com>
      Cc: Omar Sandoval <osandov@fb.com>
      Cc: Nicholas Bellinger <nab@linux-iscsi.org>
      Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
      ca18d6f7
  18. 09 Jun, 2017 1 commit
    • Christoph Hellwig's avatar
      block: introduce new block status code type · 2a842aca
      Christoph Hellwig authored
      Currently we use nornal Linux errno values in the block layer, and while
      we accept any error a few have overloaded magic meanings.  This patch
      instead introduces a new  blk_status_t value that holds block layer specific
      status codes and explicitly explains their meaning.  Helpers to convert from
      and to the previous special meanings are provided for now, but I suspect
      we want to get rid of them in the long run - those drivers that have a
      errno input (e.g. networking) usually get errnos that don't know about
      the special block layer overloads, and similarly returning them to userspace
      will usually return somethings that strictly speaking isn't correct
      for file system operations, but that's left as an exercise for later.
      
      For now the set of errors is a very limited set that closely corresponds
      to the previous overloaded errno values, but there is some low hanging
      fruite to improve it.
      
      blk_status_t (ab)uses the sparse __bitwise annotations to allow for sparse
      typechecking, so that we can easily catch places passing the wrong values.
      Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
      Signed-off-by: default avatarJens Axboe <axboe@fb.com>
      2a842aca
  19. 01 Jun, 2017 1 commit
  20. 20 Apr, 2017 1 commit
  21. 28 Mar, 2017 1 commit
  22. 28 Feb, 2017 1 commit
  23. 31 Jan, 2017 1 commit
    • Christoph Hellwig's avatar
      block: fold cmd_type into the REQ_OP_ space · aebf526b
      Christoph Hellwig authored
      Instead of keeping two levels of indirection for requests types, fold it
      all into the operations.  The little caveat here is that previously
      cmd_type only applied to struct request, while the request and bio op
      fields were set to plain REQ_OP_READ/WRITE even for passthrough
      operations.
      
      Instead this patch adds new REQ_OP_* for SCSI passthrough and driver
      private requests, althought it has to add two for each so that we
      can communicate the data in/out nature of the request.
      Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
      Signed-off-by: default avatarJens Axboe <axboe@fb.com>
      aebf526b
  24. 27 Jan, 2017 1 commit
  25. 23 Dec, 2016 1 commit
  26. 03 Nov, 2016 1 commit
  27. 04 Feb, 2015 1 commit
    • Peter Zijlstra's avatar
      block: Simplify bsg complete all · 2c561246
      Peter Zijlstra authored
      It took me a few tries to figure out what this code did; lets rewrite
      it into a more regular form.
      
      The thing that makes this one 'special' is the BSG_F_BLOCK flag, if
      that is not set we're not supposed/allowed to block and should spin
      wait for completion.
      
      The (new) io_wait_event() will never see a false condition in case of
      the spinning and we will therefore not block.
      
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
      Signed-off-by: default avatarJens Axboe <axboe@fb.com>
      2c561246
  28. 29 Aug, 2014 1 commit
  29. 28 Aug, 2014 1 commit
    • Joe Lawrence's avatar
      block,scsi: fixup blk_get_request dead queue scenarios · a492f075
      Joe Lawrence authored
      The blk_get_request function may fail in low-memory conditions or during
      device removal (even if __GFP_WAIT is set). To distinguish between these
      errors, modify the blk_get_request call stack to return the appropriate
      ERR_PTR. Verify that all callers check the return status and consider
      IS_ERR instead of a simple NULL pointer check.
      
      For consistency, make a similar change to the blk_mq_alloc_request leg
      of blk_get_request.  It may fail if the queue is dead, or the caller was
      unwilling to wait.
      Signed-off-by: default avatarJoe Lawrence <joe.lawrence@stratus.com>
      Acked-by: Jiri Kosina <jkosina@suse.cz> [for pktdvd]
      Acked-by: Boaz Harrosh <bharrosh@panasas.com> [for osd]
      Reviewed-by: default avatarJeff Moyer <jmoyer@redhat.com>
      Signed-off-by: default avatarJens Axboe <axboe@fb.com>
      a492f075
  30. 06 Jun, 2014 1 commit
    • Jens Axboe's avatar
      block: add blk_rq_set_block_pc() · f27b087b
      Jens Axboe authored
      With the optimizations around not clearing the full request at alloc
      time, we are leaving some of the needed init for REQ_TYPE_BLOCK_PC
      up to the user allocating the request.
      
      Add a blk_rq_set_block_pc() that sets the command type to
      REQ_TYPE_BLOCK_PC, and properly initializes the members associated
      with this type of request. Update callers to use this function instead
      of manipulating rq->cmd_type directly.
      
      Includes fixes from Christoph Hellwig <hch@lst.de> for my half-assed
      attempt.
      Signed-off-by: default avatarJens Axboe <axboe@fb.com>
      f27b087b
  31. 16 Apr, 2014 1 commit
    • Jens Axboe's avatar
      bsg: update check for rq based driver for blk-mq · 49fd524f
      Jens Axboe authored
      bsg currently checks ->request_fn to check whether a queue can
      handle struct request. But with blk-mq, we don't have a request_fn
      yet are request based. Add a queue_is_rq_based() helper and use
      that in bsg, I'm guessing this is not the last place we need to
      update for this. Besides, it better explains what is being
      checked.
      Signed-off-by: default avatarJens Axboe <axboe@fb.com>
      49fd524f
  32. 28 Feb, 2013 2 commits
    • Sasha Levin's avatar
      hlist: drop the node parameter from iterators · b67bfe0d
      Sasha Levin authored
      I'm not sure why, but the hlist for each entry iterators were conceived
      
              list_for_each_entry(pos, head, member)
      
      The hlist ones were greedy and wanted an extra parameter:
      
              hlist_for_each_entry(tpos, pos, head, member)
      
      Why did they need an extra pos parameter? I'm not quite sure. Not only
      they don't really need it, it also prevents the iterator from looking
      exactly like the list iterator, which is unfortunate.
      
      Besides the semantic patch, there was some manual work required:
      
       - Fix up the actual hlist iterators in linux/list.h
       - Fix up the declaration of other iterators based on the hlist ones.
       - A very small amount of places were using the 'node' parameter, this
       was modified to use 'obj->member' instead.
       - Coccinelle didn't handle the hlist_for_each_entry_safe iterator
       properly, so those had to be fixed up manually.
      
      The semantic patch which is mostly the work of Peter Senna Tschudin is here:
      
      @@
      iterator name hlist_for_each_entry, hlist_for_each_entry_continue, hlist_for_each_entry_from, hlist_for_each_entry_rcu, hlist_for_each_entry_rcu_bh, hlist_for_each_entry_continue_rcu_bh, for_each_busy_worker, ax25_uid_for_each, ax25_for_each, inet_bind_bucket_for_each, sctp_for_each_hentry, sk_for_each, sk_for_each_rcu, sk_for_each_from, sk_for_each_safe, sk_for_each_bound, hlist_for_each_entry_safe, hlist_for_each_entry_continue_rcu, nr_neigh_for_each, nr_neigh_for_each_safe, nr_node_for_each, nr_node_for_each_safe, for_each_gfn_indirect_valid_sp, for_each_gfn_sp, for_each_host;
      
      type T;
      expression a,c,d,e;
      identifier b;
      statement S;
      @@
      
      -T b;
          <+... when != b
      (
      hlist_for_each_entry(a,
      - b,
      c, d) S
      |
      hlist_for_each_entry_continue(a,
      - b,
      c) S
      |
      hlist_for_each_entry_from(a,
      - b,
      c) S
      |
      hlist_for_each_entry_rcu(a,
      - b,
      c, d) S
      |
      hlist_for_each_entry_rcu_bh(a,
      - b,
      c, d) S
      |
      hlist_for_each_entry_continue_rcu_bh(a,
      - b,
      c) S
      |
      for_each_busy_worker(a, c,
      - b,
      d) S
      |
      ax25_uid_for_each(a,
      - b,
      c) S
      |
      ax25_for_each(a,
      - b,
      c) S
      |
      inet_bind_bucket_for_each(a,
      - b,
      c) S
      |
      sctp_for_each_hentry(a,
      - b,
      c) S
      |
      sk_for_each(a,
      - b,
      c) S
      |
      sk_for_each_rcu(a,
      - b,
      c) S
      |
      sk_for_each_from
      -(a, b)
      +(a)
      S
      + sk_for_each_from(a) S
      |
      sk_for_each_safe(a,
      - b,
      c, d) S
      |
      sk_for_each_bound(a,
      - b,
      c) S
      |
      hlist_for_each_entry_safe(a,
      - b,
      c, d, e) S
      |
      hlist_for_each_entry_continue_rcu(a,
      - b,
      c) S
      |
      nr_neigh_for_each(a,
      - b,
      c) S
      |
      nr_neigh_for_each_safe(a,
      - b,
      c, d) S
      |
      nr_node_for_each(a,
      - b,
      c) S
      |
      nr_node_for_each_safe(a,
      - b,
      c, d) S
      |
      - for_each_gfn_sp(a, c, d, b) S
      + for_each_gfn_sp(a, c, d) S
      |
      - for_each_gfn_indirect_valid_sp(a, c, d, b) S
      + for_each_gfn_indirect_valid_sp(a, c, d) S
      |
      for_each_host(a,
      - b,
      c) S
      |
      for_each_host_safe(a,
      - b,
      c, d) S
      |
      for_each_mesh_entry(a,
      - b,
      c, d) S
      )
          ...+>
      
      [akpm@linux-foundation.org: drop bogus change from net/ipv4/raw.c]
      [akpm@linux-foundation.org: drop bogus hunk from net/ipv6/raw.c]
      [akpm@linux-foundation.org: checkpatch fixes]
      [akpm@linux-foundation.org: fix warnings]
      [akpm@linux-foudnation.org: redo intrusive kvm changes]
      Tested-by: Peter Senna Tschudin's avatarPeter Senna Tschudin <peter.senna@gmail.com>
      Acked-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
      Signed-off-by: default avatarSasha Levin <sasha.levin@oracle.com>
      Cc: Wu Fengguang <fengguang.wu@intel.com>
      Cc: Marcelo Tosatti <mtosatti@redhat.com>
      Cc: Gleb Natapov <gleb@redhat.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      b67bfe0d
    • Tejun Heo's avatar
      block: convert to idr_alloc() · bab998d6
      Tejun Heo authored
      Convert to the much saner new idr interface.  Both bsg and genhd
      protect idr w/ mutex making preloading unnecessary.
      Signed-off-by: default avatarTejun Heo <tj@kernel.org>
      Acked-by: default avatarJens Axboe <axboe@kernel.dk>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      bab998d6
  33. 08 Feb, 2012 1 commit
    • Stanislaw Gruszka's avatar
      bsg: fix sysfs link remove warning · 37b40adf
      Stanislaw Gruszka authored
      We create "bsg" link if q->kobj.sd is not NULL, so remove it only
      when the same condition is true.
      
      Fixes:
      
      WARNING: at fs/sysfs/inode.c:323 sysfs_hash_and_remove+0x2b/0x77()
      sysfs: can not remove 'bsg', no directory
      Call Trace:
        [<c0429683>] warn_slowpath_common+0x6a/0x7f
        [<c0537a68>] ? sysfs_hash_and_remove+0x2b/0x77
        [<c042970b>] warn_slowpath_fmt+0x2b/0x2f
        [<c0537a68>] sysfs_hash_and_remove+0x2b/0x77
        [<c053969a>] sysfs_remove_link+0x20/0x23
        [<c05d88f1>] bsg_unregister_queue+0x40/0x6d
        [<c0692263>] __scsi_remove_device+0x31/0x9d
        [<c069149f>] scsi_forget_host+0x41/0x52
        [<c0689fa9>] scsi_remove_host+0x71/0xe0
        [<f7de5945>] quiesce_and_remove_host+0x51/0x83 [usb_storage]
        [<f7de5a1e>] usb_stor_disconnect+0x18/0x22 [usb_storage]
        [<c06c29de>] usb_unbind_interface+0x4e/0x109
        [<c067a80f>] __device_release_driver+0x6b/0xa6
        [<c067a861>] device_release_driver+0x17/0x22
        [<c067a46a>] bus_remove_device+0xd6/0xe6
        [<c06785e2>] device_del+0xf2/0x137
        [<c06c101f>] usb_disable_device+0x94/0x1a0
      Signed-off-by: default avatarStanislaw Gruszka <sgruszka@redhat.com>
      Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
      37b40adf
  34. 04 Jan, 2012 1 commit
  35. 13 Dec, 2011 1 commit
    • Tejun Heo's avatar
      block: misc updates to blk_get_queue() · 09ac46c4
      Tejun Heo authored
      * blk_get_queue() is peculiar in that it returns 0 on success and 1 on
        failure instead of 0 / -errno or boolean.  Update it such that it
        returns %true on success and %false on failure.
      
      * Make sure the caller checks for the return value.
      
      * Separate out __blk_get_queue() which doesn't check whether @q is
        dead and put it in blk.h.  This will be used later.
      
      This patch doesn't introduce any functional changes.
      Signed-off-by: default avatarTejun Heo <tj@kernel.org>
      Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
      09ac46c4
  36. 20 Jun, 2011 3 commits