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  1. 25 9月, 2006 14 次提交
    • M
      ocfs2: Remove i_generation from inode lock names · 24c19ef4
      由 Mark Fasheh 提交于 
      OCFS2 puts inode meta data in the "lock value block" provided by the DLM.
Typically, i_generation is encoded in the lock name so that a deleted inode
on and a new one in the same block don't share the same lvb.

Unfortunately, that scheme means that the read in ocfs2_read_locked_inode()
is potentially thrown away as soon as the meta data lock is taken - we
cannot encode the lock name without first knowing i_generation, which
requires a disk read.

This patch encodes i_generation in the inode meta data lvb, and removes the
value from the inode meta data lock name. This way, the read can be covered
by a lock, and at the same time we can distinguish between an up to date and
a stale LVB.

This will help cold-cache stat(2) performance in particular.

Since this patch changes the protocol version, we take the opportunity to do
a minor re-organization of two of the LVB fields.
Signed-off-by: NMark Fasheh <mark.fasheh@oracle.com>
      24c19ef4
    • M
      ocfs2: Encode i_generation in the meta data lvb · f9e2d82e
      由 Mark Fasheh 提交于 
      When i_generation is removed from the lockname, this will help us determine
whether a meta data lvb has information that is in sync with the local
struct inode.
Signed-off-by: NMark Fasheh <mark.fasheh@oracle.com>
      f9e2d82e
    • M
      ocfs2: Free up some space in the lvb · 4d3b83f7
      由 Mark Fasheh 提交于 
      lvb_version doesn't need to be a whole 32 bits. Make it an 8 bit field to
free up some space. This should be backwards compatible until we use one of
the fields, in which case we'd bump the lvb version anyway.
Signed-off-by: NMark Fasheh <mark.fasheh@oracle.com>
      4d3b83f7
    • M
      ocfs2: Remove special casing for inode creation in ocfs2_dentry_attach_lock() · 0027dd5b
      由 Mark Fasheh 提交于 
      We can't use LKM_LOCAL for new dentry locks because an unlink and subsequent
re-create of a name/inode pair may result in the lock still being mastered
somewhere in the cluster.
Signed-off-by: NMark Fasheh <mark.fasheh@oracle.com>
      0027dd5b
    • M
      ocfs2: manually d_move() during ocfs2_rename() · 1ba9da2f
      由 Mark Fasheh 提交于 
      Make use of FS_RENAME_DOES_D_MOVE to avoid a race condition that can occur
during ->rename() if we d_move() outside of the parent directory cluster
locks, and another node discovers the new name (created during the rename)
and unlinks it. d_move() will unconditionally rehash a dentry - which will
leave stale data in the system.
Signed-off-by: NMark Fasheh <mark.fasheh@oracle.com>
      1ba9da2f
    • M
      [PATCH] Allow file systems to manually d_move() inside of ->rename() · 349457cc
      由 Mark Fasheh 提交于 
      Some file systems want to manually d_move() the dentries involved in a
rename.  We can do this by making use of the FS_ODD_RENAME flag if we just
have nfs_rename() unconditionally do the d_move().  While there, we rename
the flag to be more descriptive.

OCFS2 uses this to protect that part of the rename operation with a cluster
lock.
Signed-off-by: NMark Fasheh <mark.fasheh@oracle.com>
Cc: Trond Myklebust <trond.myklebust@fys.uio.no>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
      349457cc
    • M
      ocfs2: Remove the dentry vote · 1390334b
      由 Mark Fasheh 提交于 
      This is unused now.
Signed-off-by: NMark Fasheh <mark.fasheh@oracle.com>
      1390334b
    • M
      ocfs2: Hook rest of the file system into dentry locking API · 379dfe9d
      由 Mark Fasheh 提交于 
      Actually replace the vote calls with the new dentry operations. Make any
necessary adjustments to get the scheme to work.
Signed-off-by: NMark Fasheh <mark.fasheh@oracle.com>
      379dfe9d
    • M
      ocfs2: Add dentry tracking API · 80c05846
      由 Mark Fasheh 提交于 
      Replace the dentry vote mechanism with a cluster lock which covers a set
of dentries. This allows us to force d_delete() only on nodes which actually
care about an unlink.

Every node that does a ->lookup() gets a read only lock on the dentry, until
an unlink during which the unlinking node, will request an exclusive lock,
forcing the other nodes who care about that dentry to d_delete() it. The
effect is that we retain a very lightweight ->d_revalidate(), and at the
same time get to make large improvements to the average case performance of
the ocfs2 unlink and rename operations.

This patch adds the higher level API and the dentry manipulation code.
Signed-off-by: NMark Fasheh <mark.fasheh@oracle.com>
      80c05846
    • M
      ocfs2: Add new cluster lock type · d680efe9
      由 Mark Fasheh 提交于 
      Replace the dentry vote mechanism with a cluster lock which covers a set
of dentries. This allows us to force d_delete() only on nodes which actually
care about an unlink.

Every node that does a ->lookup() gets a read only lock on the dentry, until
an unlink during which the unlinking node, will request an exclusive lock,
forcing the other nodes who care about that dentry to d_delete() it. The
effect is that we retain a very lightweight ->d_revalidate(), and at the
same time get to make large improvements to the average case performance of
the ocfs2 unlink and rename operations.

This patch adds the cluster lock type which OCFS2 can attach to
dentries.  A small number of fs/ocfs2/dcache.c functions are stubbed
out so that this change can compile.
Signed-off-by: NMark Fasheh <mark.fasheh@oracle.com>
      d680efe9
    • M
      ocfs2: Update dlmglue for new dlmlock() API · f0681062
      由 Mark Fasheh 提交于 
      File system lock names are very regular right now, so we really only need to
pass an extra parameter to dlmlock().
Signed-off-by: NMark Fasheh <mark.fasheh@oracle.com>
      f0681062
    • M
      ocfs2: Update dlmfs for new dlmlock() API · ea5b3a18
      由 Mark Fasheh 提交于 
      We just need to add a namelen field to the user_lock_res structure, and
update a few debug prints. Instead of updating all debug prints, I took the
opportunity to remove a few that are likely unnecessary these days.
Signed-off-by: NMark Fasheh <mark.fasheh@oracle.com>
      ea5b3a18
    • M
      ocfs2: Allow binary names in the DLM · 3384f3df
      由 Mark Fasheh 提交于 
      The OCFS2 DLM uses strlen() to determine lock name length, which excludes
the possibility of putting binary values in the name string. Fix this by
requiring that string length be passed in as a parameter.
Signed-off-by: NMark Fasheh <mark.fasheh@oracle.com>
      3384f3df
    • M
      ocfs2: Silence dlm error print · e2c73698
      由 Mark Fasheh 提交于 
      An AST can be delivered via the network after a lock has been removed, so no
need to print an error when we see that.
Signed-off-by: NMark Fasheh <mark.fasheh@oracle.com>
      e2c73698
  3. 24 9月, 2006 1 次提交
  5. 23 9月, 2006 25 次提交