kernel.git/fs/gfs2/log.c, branch linux-3.5.y

GFS2: eliminate log elements and simplify

2012-05-02T08:14:36Z

This patch eliminates the gfs2_log_element data structure and rolls its two components into the gfs2_bufdata. This makes the code easier to understand and makes it easier to migrate to a rbtree to keep the list sorted. Signed-off-by: Bob Peterson Signed-off-by: Steven Whitehouse

GFS2: Log code fixes

2012-04-24T15:44:38Z

This patch removes a log lock from around atomic operation where it is not needed, removes an unused variable, and also changes a void pointer used incorrectly to a struct page pointer. Signed-off-by: Steven Whitehouse

GFS2: Remove bd_list_tr

2012-04-24T15:44:36Z

This is another clean up in the logging code. This per-transaction list was largely unused. Its main function was to ensure that the number of buffers in a transaction was correct, however that counter was only used to check the number of buffers in the bd_list_tr, plus an assert at the end of each transaction. With the assert now changed to use the calculated buffer counts, we can remove both bd_list_tr and its associated counter. This should make the code easier to understand as well as shrinking a couple of structures. Signed-off-by: Steven Whitehouse

GFS2: Clean up log write code path

2012-04-24T15:44:34Z

Prior to this patch, we have two ways of sending i/o to the log. One of those is used when we need to allocate both the data to be written itself and also a buffer head to submit it. This is done via sb_getblk and friends. This is used mostly for writing log headers. The other method is used when writing blocks which have some in-place counterpart. This is the case for all the metadata blocks which are journalled, and when journaled data is in use, for unescaped journalled data blocks. This patch replaces both of those two methods, and about half a dozen separate i/o submission points with a single i/o submission function. We also go direct to bio rather than using buffer heads, since this allows us to build i/o requests of the maximum size for the block device in question. It also reduces the memory required for flushing the log, which can be very useful in low memory situations. Signed-off-by: Steven Whitehouse

GFS2: Drop "pull" argument from log_write_header()

2012-04-24T15:44:24Z

The "pull" argument to log_write_header() is only used for debug purposes and it is not really needed any more. There are other tests for this particular problem, so I think we can dispose of it in order to simplify the code. Signed-off-by: Steven Whitehouse

GFS2: Clean up log flush header writing

2012-03-09T14:07:06Z

We already send both a pre and post flush to the block device when writing a journal header. There is no need to wait for the previous I/O specifically when we do this, unless we've turned "barriers" off. As a side effect, this also cleans up the code path for flushing the journal and makes it more readable. Signed-off-by: Steven Whitehouse

GFS2: Make bd_cmp() static

2012-02-28T17:11:27Z

Add missing static to bd_cmp() Signed-off-by: Steven Whitehouse

GFS2: Sort the ordered write list

2012-02-28T17:10:53Z

This patch sorts the ordered write list for GFS2 writes. This increases the throughput for simultaneous writes. For example, if you have ten processes, all doing: dd if=/dev/zero of=/mnt/gfs2/fileX on different files, the throughput will be much better. Signed-off-by: Bob Peterson Signed-off-by: Steven Whitehouse

GFS2: Move two functions from log.c to lops.c

2012-02-28T17:09:59Z

gfs2_log_get_buf() and gfs2_log_fake_buf() are both used only in lops.c, so move them next to their callers and they can then become static. Signed-off-by: Steven Whitehouse

Merge branch 'pm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

2012-01-08T21:10:57Z

* 'pm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (76 commits) PM / Hibernate: Implement compat_ioctl for /dev/snapshot PM / Freezer: fix return value of freezable_schedule_timeout_killable() PM / shmobile: Allow the A4R domain to be turned off at run time PM / input / touchscreen: Make st1232 use device PM QoS constraints PM / QoS: Introduce dev_pm_qos_add_ancestor_request() PM / shmobile: Remove the stay_on flag from SH7372's PM domains PM / shmobile: Don't include SH7372's INTCS in syscore suspend/resume PM / shmobile: Add support for the sh7372 A4S power domain / sleep mode PM: Drop generic_subsys_pm_ops PM / Sleep: Remove forward-only callbacks from AMBA bus type PM / Sleep: Remove forward-only callbacks from platform bus type PM: Run the driver callback directly if the subsystem one is not there PM / Sleep: Make pm_op() and pm_noirq_op() return callback pointers PM/Devfreq: Add Exynos4-bus device DVFS driver for Exynos4210/4212/4412. PM / Sleep: Merge internal functions in generic_ops.c PM / Sleep: Simplify generic system suspend callbacks PM / Hibernate: Remove deprecated hibernation snapshot ioctls PM / Sleep: Fix freezer failures due to racy usermodehelper_is_disabled() ARM: S3C64XX: Implement basic power domain support PM / shmobile: Use common always on power domain governor ... Fix up trivial conflict in fs/xfs/xfs_buf.c due to removal of unused XBT_FORCE_SLEEP bit