提交 · 8f065d36508f283ee6cbeb05829f032d0b782a16 · openeuler / raspberrypi-kernel

03 5月, 2011 3 次提交

GFS2: Improve bug trap code in ->releasepage() · 8f065d36

由 Steven Whitehouse 提交于 5月 03, 2011

If the buffer is dirty or pinned, then as well as printing a
warning, we should also refuse to release the page in
question.

Currently this can occur if there is a race between mmap()ed
writers and O_DIRECT on the same file. With the addition of
->launder_page() in the future, we should be able to close
this gap.
Signed-off-by: NSteven Whitehouse <swhiteho@redhat.com>

8f065d36

GFS2: Fix ail list traversal · 4f1de018

由 Steven Whitehouse 提交于 4月 26, 2011

In the recent patches to update the AIL list code, I managed to
forget that the ail list lock got dropped, even though I
added a comment specifically to remind myself :(
Reported-by: NBarry Marson <bmarson@redhat.com>
Signed-off-by: NSteven Whitehouse <swhiteho@redhat.com>

4f1de018

GFS2: make sure fallocate bytes is a multiple of blksize · 6905d9e4

由 Benjamin Marzinski 提交于 4月 26, 2011

The GFS2 fallocate code chooses a target size to for allocating chunks of
space. Whenever it can't find any resource groups with enough space free, it
halves its target. Since this target is in bytes, eventually it will no longer
be a multiple of blksize. As long as there is more space available in the
resource group than the target, this isn't a problem, since gfs2 will use the
actual space available, which is always a multiple of blksize. However,
when gfs couldn't fallocate a bigger chunk than the target, it was using the
non-blksize aligned number. This caused a BUG in later code that required
blksize aligned offsets. GFS2 now ensures that bytes is always a multiple of
blksize
Signed-off-by: NBenjamin Marzinski <bmarzins@redhat.com>
Signed-off-by: NSteven Whitehouse <swhiteho@redhat.com>

6905d9e4

20 4月, 2011 31 次提交

GFS2: Add an AIL writeback tracepoint · c83ae9ca

由 Steven Whitehouse 提交于 4月 18, 2011

Add a tracepoint for monitoring writeback of the AIL.
Signed-off-by: NSteven Whitehouse <swhiteho@redhat.com>

c83ae9ca

GFS2: Make writeback more responsive to system conditions · 4667a0ec

由 Steven Whitehouse 提交于 4月 18, 2011

This patch adds writeback_control to writing back the AIL
list. This means that we can then take advantage of the
information we get in ->write_inode() in order to set off
some pre-emptive writeback.

In addition, the AIL code is cleaned up a bit to make it
a bit simpler to understand.

There is still more which can usefully be done in this area,
but this is a good start at least.
Signed-off-by: NSteven Whitehouse <swhiteho@redhat.com>

4667a0ec

GFS2: Optimise glock lru and end of life inodes · f42ab085

由 Steven Whitehouse 提交于 4月 14, 2011

The GLF_LRU flag introduced in the previous patch can be
used to check if a glock is on the lru list when a new
holder is queued and if so remove it, without having first
to get the lru_lock.

The main purpose of this patch however is to optimise the
glocks left over when an inode at end of life is being
evicted. Previously such glocks were left with the GLF_LFLUSH
flag set, so that when reclaimed, each one required a log flush.
This patch resets the GLF_LFLUSH flag when there is nothing
left to flush thus preventing later log flushes as glocks are
reused or demoted.

In order to do this, we need to keep track of the number of
revokes which are outstanding, and also to clear the GLF_LFLUSH
bit after a log commit when only revokes have been processed.
Signed-off-by: NSteven Whitehouse <swhiteho@redhat.com>

f42ab085

GFS2: Improve tracing support (adds two flags) · 627c10b7

由 Steven Whitehouse 提交于 4月 14, 2011

This adds support for two new flags. One keeps track of whether
the glock is on the LRU list or not. The other isn't really a
flag as such, but an indication of whether the glock has an
attached object or not. This indication is reported without
any locking, which is ok since we do not dereference the object
pointer but merely report whether it is NULL or not.

Also, this fixes one place where a tracepoint was missing, which
was at the point we remove deallocated blocks from the journal.
Signed-off-by: NSteven Whitehouse <swhiteho@redhat.com>

627c10b7

GFS2: Clean up fsync() · dba898b0

由 Steven Whitehouse 提交于 4月 14, 2011

This patch is designed to clean up GFS2's fsync
implementation and ensure that it really does get everything on
disk. Since ->write_inode() has been updated, we can call that
via the vfs library function sync_inode_metadata() and the only
remaining thing that has to be done is to ensure that we get
any revoke records in the log after the inode has been written back.
Signed-off-by: NSteven Whitehouse <swhiteho@redhat.com>

dba898b0

GFS2: Remove unused macro · efc1a9c2

由 Steven Whitehouse 提交于 4月 13, 2011

The buffer_in_io() macro has been unused for some time,
so remove it.
Signed-off-by: NSteven Whitehouse <swhiteho@redhat.com>

efc1a9c2

GFS2: Alter point of entry to glock lru list for glocks with an address_space · 29687a2a

由 Steven Whitehouse 提交于 3月 30, 2011

Rather than allowing the glocks to be scheduled for possible
reclaim as soon as they have exited the journal, this patch
delays their entry to the list until the glocks in question
are no longer in use.

This means that we will rely on the vm for writeback of all
dirty data and metadata from now on. When glocks are added
to the lru list they should be freeable much faster since all
the I/O required to free them should have already been completed.

This should lead to much better I/O patterns under low memory
conditions.
Signed-off-by: NSteven Whitehouse <swhiteho@redhat.com>

29687a2a

GFS2: Use filemap_fdatawrite() to write back the AIL · 5ac048bb

由 Steven Whitehouse 提交于 3月 30, 2011

In order to ensure that the mapping stats (and thus the bdi) are correctly
updated, this patch changes the AIL writeback to use the filemap_datawrite
function. This helps prevent stalls in balance_dirty_pages() due to
large amounts of dirty metadata when there is little or no dirty data
around.
Signed-off-by: NSteven Whitehouse <swhiteho@redhat.com>

5ac048bb

GFS2: Make ->write_inode() really write · 1027efaa

由 Steven Whitehouse 提交于 3月 30, 2011

The GFS2 ->write_inode function should be more aggressive at writing
back to the filesystem. This adopts the XFS system of returning
-EAGAIN when the writeback has not been completely done. Also, we
now kick off in-place writeback when called with WB_SYNC_NONE,
but we only wait for it and flush the log when WB_SYNC_ALL is
requested.
Signed-off-by: NSteven Whitehouse <swhiteho@redhat.com>

1027efaa

GFS2: move function foreach_leaf to gfs2_dir_exhash_dealloc · 556bb179