1. 05 May, 2015 1 commit
  2. 01 May, 2015 1 commit
  3. 18 Mar, 2015 1 commit
    • Abhi Das's avatar
      gfs2: perform quota checks against allocation parameters · b8fbf471
      Abhi Das authored
      Use struct gfs2_alloc_parms as an argument to gfs2_quota_check()
      and gfs2_quota_lock_check() to check for quota violations while
      accounting for the new blocks requested by the current operation
      in ap->target.
      Previously, the number of new blocks requested during an operation
      were not accounted for during quota_check and would allow these
      operations to exceed quota. This was not very apparent since most
      operations allocated only 1 block at a time and quotas would get
      violated in the next operation. i.e. quota excess would only be by
      1 block or so. With fallocate, (where we allocate a bunch of blocks
      at once) the quota excess is non-trivial and is addressed by this
      Signed-off-by: default avatarAbhi Das <adas@redhat.com>
      Signed-off-by: default avatarBob Peterson <rpeterso@redhat.com>
      Acked-by: default avatarSteven Whitehouse <swhiteho@redhat.com>
  4. 26 Jan, 2015 1 commit
  5. 20 Nov, 2014 3 commits
  6. 19 Nov, 2014 3 commits
  7. 17 Nov, 2014 1 commit
    • Benjamin Marzinski's avatar
      GFS2: update freeze code to use freeze/thaw_super on all nodes · 2e60d768
      Benjamin Marzinski authored
      The current gfs2 freezing code is considerably more complicated than it
      should be because it doesn't use the vfs freezing code on any node except
      the one that begins the freeze.  This is because it needs to acquire a
      cluster glock before calling the vfs code to prevent a deadlock, and
      without the new freeze_super and thaw_super hooks, that was impossible. To
      deal with the issue, gfs2 had to do some hacky locking tricks to make sure
      that a frozen node couldn't be holding on a lock it needed to do the
      unfreeze ioctl.
      This patch makes use of the new hooks to simply the gfs2 locking code. Now,
      all the nodes in the cluster freeze and thaw in exactly the same way. Every
      node in the cluster caches the freeze glock in the shared state.  The new
      freeze_super hook allows the freezing node to grab this freeze glock in
      the exclusive state without first calling the vfs freeze_super function.
      All the nodes in the cluster see this lock change, and call the vfs
      freeze_super function. The vfs locking code guarantees that the nodes can't
      get stuck holding the glocks necessary to unfreeze the system.  To
      unfreeze, the freezing node uses the new thaw_super hook to drop the freeze
      glock. Again, all the nodes notice this, reacquire the glock in shared mode
      and call the vfs thaw_super function.
      Signed-off-by: default avatarBenjamin Marzinski <bmarzins@redhat.com>
      Signed-off-by: default avatarSteven Whitehouse <swhiteho@redhat.com>
  8. 03 Nov, 2014 1 commit
  9. 09 Oct, 2014 1 commit
  10. 01 Oct, 2014 1 commit
    • Bob Peterson's avatar
      GFS2: Make rename not save dirent location · 19aeb5a6
      Bob Peterson authored
      This patch fixes a regression in the patch "GFS2: Remember directory
      insert point", commit 2b47dad8
      The problem had to do with the rename function: The function found
      space for the new dirent, and remembered that location. But then the
      old dirent was removed, which often moved the eligible location for
      the renamed dirent. Putting the new dirent at the saved location
      caused file system corruption.
      This patch adds a new "save_loc" variable to struct gfs2_diradd.
      If 1, the dirent location is saved. If 0, the dirent location is not
      saved and the buffer_head is released as per previous behavior.
      Signed-off-by: default avatarBob Peterson <rpeterso@redhat.com>
      Signed-off-by: default avatarSteven Whitehouse <swhiteho@redhat.com>
  11. 19 Sep, 2014 1 commit
    • Abhi Das's avatar
      GFS2: fix bad inode i_goal values during block allocation · 00a158be
      Abhi Das authored
      This patch checks if i_goal is either zero or if doesn't exist
      within any rgrp (i.e gfs2_blk2rgrpd() returns NULL). If so, it
      assigns the ip->i_no_addr block as the i_goal.
      There are two scenarios where a bad i_goal can result in a
      -EBADSLT error.
      1. Attempting to allocate to an existing inode:
      Control reaches gfs2_inplace_reserve() and ip->i_goal is bad.
      We need to fix i_goal here.
      2. A new inode is created in a directory whose i_goal is hosed:
      In this case, the parent dir's i_goal is copied onto the new
      inode. Since the new inode is not yet created, the ip->i_no_addr
      field is invalid and so, the fix in gfs2_inplace_reserve() as per
      1) won't work in this scenario. We need to catch and fix it sooner
      in the parent dir itself (gfs2_create_inode()), before it is
      copied to the new inode.
      Signed-off-by: default avatarAbhi Das <adas@redhat.com>
      Signed-off-by: default avatarSteven Whitehouse <swhiteho@redhat.com>
  12. 12 Sep, 2014 1 commit
    • Al Viro's avatar
      GFS2: fix d_splice_alias() misuses · cfb2f9d5
      Al Viro authored
      Callers of d_splice_alias(dentry, inode) don't need iput(), neither
      on success nor on failure.  Either the reference to inode is stored
      in a previously negative dentry, or it's dropped.  In either case
      inode reference the caller used to hold is consumed.
      __gfs2_lookup() does iput() in case when d_splice_alias() has failed.
      Double iput() if we ever hit that.  And gfs2_create_inode() ends up
      not only with double iput(), but with link count dropped to zero - on
      an inode it has just found in directory.
      Cc: stable@vger.kernel.org # v3.14+
      Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
      Signed-off-by: default avatarSteven Whitehouse <swhiteho@redhat.com>
  13. 11 Sep, 2014 1 commit
  14. 14 May, 2014 1 commit
    • Benjamin Marzinski's avatar
      GFS2: remove transaction glock · 24972557
      Benjamin Marzinski authored
      GFS2 has a transaction glock, which must be grabbed for every
      transaction, whose purpose is to deal with freezing the filesystem.
      Aside from this involving a large amount of locking, it is very easy to
      make the current fsfreeze code hang on unfreezing.
      This patch rewrites how gfs2 handles freezing the filesystem. The
      transaction glock is removed. In it's place is a freeze glock, which is
      cached (but not held) in a shared state by every node in the cluster
      when the filesystem is mounted. This lock only needs to be grabbed on
      freezing, and actions which need to be safe from freezing, like
      When a node wants to freeze the filesystem, it grabs this glock
      exclusively.  When the freeze glock state changes on the nodes (either
      from shared to unlocked, or shared to exclusive), the filesystem does a
      special log flush.  gfs2_log_flush() does all the work for flushing out
      the and shutting down the incore log, and then it tries to grab the
      freeze glock in a shared state again.  Since the filesystem is stuck in
      gfs2_log_flush, no new transaction can start, and nothing can be written
      to disk. Unfreezing the filesytem simply involes dropping the freeze
      glock, allowing gfs2_log_flush() to grab and then release the shared
      lock, so it is cached for next time.
      However, in order for the unfreezing ioctl to occur, gfs2 needs to get a
      shared lock on the filesystem root directory inode to check permissions.
      If that glock has already been grabbed exclusively, fsfreeze will be
      unable to get the shared lock and unfreeze the filesystem.
      In order to allow the unfreeze, this patch makes gfs2 grab a shared lock
      on the filesystem root directory during the freeze, and hold it until it
      unfreezes the filesystem.  The functions which need to grab a shared
      lock in order to allow the unfreeze ioctl to be issued now use the lock
      grabbed by the freeze code instead.
      The freeze and unfreeze code take care to make sure that this shared
      lock will not be dropped while another process is using it.
      Signed-off-by: default avatarBenjamin Marzinski <bmarzins@redhat.com>
      Signed-off-by: default avatarSteven Whitehouse <swhiteho@redhat.com>
  15. 31 Mar, 2014 1 commit
  16. 19 Mar, 2014 1 commit
  17. 12 Mar, 2014 1 commit
  18. 04 Feb, 2014 1 commit
    • Steven Whitehouse's avatar
      GFS2: Allocate block for xattr at inode alloc time, if required · b2c8b3ea
      Steven Whitehouse authored
      This is another step towards improving the allocation of xattr
      blocks at inode allocation time. Here we take advantage of
      Christoph's recent work on ACLs to allocate a block for the
      xattrs early if we know that we will be adding ACLs to the
      inode later on. The advantage of that is that it is much
      more likely that we'll get a contiguous run of two blocks
      where the first is the inode and the second is the xattr block.
      We still have to fall back to the original system in case we
      don't get the requested two contiguous blocks, or in case the
      ACLs are too large to fit into the block.
      Future patches will move more of the ACL setting code further
      up the gfs2_inode_create() function. Also, I'd like to be
      able to do the same thing with the xattrs from LSMs in
      due course, too. That way we should be able to slowly reduce
      the number of independent transactions, at least in the
      most common cases.
      Signed-off-by: default avatarSteven Whitehouse <swhiteho@redhat.com>
  19. 26 Jan, 2014 1 commit
  20. 18 Jan, 2014 1 commit
  21. 16 Jan, 2014 1 commit
    • Steven Whitehouse's avatar
      GFS2: Don't use ENOBUFS when ENOMEM is the correct error code · ac3beb6a
      Steven Whitehouse authored
      Al Viro has tactfully pointed out that we are using the incorrect
      error code in some cases. This patch fixes that, and also removes
      the (unused) return value for glock dumping.
      >        * gfs2_iget() - ENOBUFS instead of ENOMEM.  ENOBUFS is
      > "No buffer space available (POSIX.1 (XSI STREAMS option))" and since
      > we don't support STREAMS it's probably fair game, but... what the hell?
      Signed-off-by: default avatarSteven Whitehouse <swhiteho@redhat.com>
      Cc: Al Viro <viro@ZenIV.linux.org.uk>
  22. 07 Jan, 2014 1 commit
  23. 06 Jan, 2014 3 commits
    • Steven Whitehouse's avatar
      GFS2: Remember directory insert point · 2b47dad8
      Steven Whitehouse authored
      When we look to see if there is enough space to add a dir
      entry without allocation, we have then been repeating the
      same search later when we do the actual insertion. This
      patch caches the details of the location in the gfs2_diradd
      structure, so that we do not have to repeat the search.
      This will provide a performance improvement which will be
      greater as the size of the directory increases.
      Signed-off-by: default avatarSteven Whitehouse <swhiteho@redhat.com>
    • Steven Whitehouse's avatar
      GFS2: Consolidate transaction blocks calculation for dir add · 534cf9ca
      Steven Whitehouse authored
      There are three cases where we need to calculate the number of
      blocks to reserve in a transaction involving linking an inode
      into a directory. The one in rename is a bit more complicated,
      but the basis of it is the same as for link and create. So it
      makes sense to move this calculation into a single function
      rather than repeating it three times.
      Signed-off-by: default avatarSteven Whitehouse <swhiteho@redhat.com>
    • Steven Whitehouse's avatar
      GFS2: Add directory addition info structure · 3c1c0ae1
      Steven Whitehouse authored
      The intent is that this structure will hold the information
      required when adding entries to a directory (linking). To
      start with, it will contain only the number of blocks which
      are required to link the new entry into the directory. The
      current calculation returns either 0 or the maximim number of
      blocks that can ever be requested by such a transaction.
      The intent is that in a later patch, we can update the dir
      code to calculate this value more accurately. In addition
      further patches will also add further fields to the new
      structure to increase its utility.
      In addition this patch fixes a bug where the link used during
      inode creation was adding requesting too many blocks in
      some cases. This is harmless unless the fs is close to being
      Signed-off-by: default avatarSteven Whitehouse <swhiteho@redhat.com>
  24. 21 Nov, 2013 1 commit
  25. 25 Oct, 2013 1 commit
  26. 02 Oct, 2013 1 commit
    • Steven Whitehouse's avatar
      GFS2: Add allocation parameters structure · 7b9cff46
      Steven Whitehouse authored
      This patch adds a structure to contain allocation parameters with
      the intention of future expansion of this structure. The idea is
      that we should be able to add more information about the allocation
      in the future in order to allow the allocator to make a better job
      of placing the requests on-disk.
      There is no functional difference from applying this patch.
      Signed-off-by: default avatarSteven Whitehouse <swhiteho@redhat.com>
  27. 27 Sep, 2013 1 commit
    • Steven Whitehouse's avatar
      GFS2: Clean up reservation removal · af5c2697
      Steven Whitehouse authored
      The reservation for an inode should be cleared when it is truncated so
      that we can start again at a different offset for future allocations.
      We could try and do better than that, by resetting the search based on
      where the truncation started from, but this is only a first step.
      In addition, there are three callers of gfs2_rs_delete() but only one
      of those should really be testing the value of i_writecount. While
      we get away with that in the other cases currently, I think it would
      be better if we made that test specific to the one case which
      requires it.
      Signed-off-by: default avatarSteven Whitehouse <swhiteho@redhat.com>
  28. 23 Sep, 2013 1 commit
  29. 17 Sep, 2013 1 commit
  30. 16 Sep, 2013 1 commit
  31. 19 Aug, 2013 2 commits
  32. 22 Jul, 2013 1 commit
  33. 14 Jun, 2013 1 commit
    • Steven Whitehouse's avatar
      GFS2: Add atomic_open support · 6d4ade98
      Steven Whitehouse authored
      I've restricted atomic_open to only operate on regular files, although
      I still don't understand why atomic_open should not be possible also for
      directories on GFS2. That can always be added in later though, if it
      makes sense.
      The ->atomic_open function can be passed negative dentries, which
      in most cases means either ENOENT (->lookup) or a call to d_instantiate
      (->create). In the GFS2 case though, we need to actually perform the
      look up, since we do not know whether there has been a new inode created
      on another node. The look up calls d_splice_alias which then tries to
      rehash the dentry - so the solution here is to simply check for that
      in d_splice_alias. The same issue is likely to affect any other cluster
      filesystem implementing ->atomic_open
      Signed-off-by: default avatarSteven Whitehouse <swhiteho@redhat.com>
      Cc: Al Viro <viro@zeniv.linux.org.uk>
      Cc: "J. Bruce Fields" <bfields fieldses org>
      Cc: Jeff Layton <jlayton@redhat.com>