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  1. 30 Sep, 2009 1 commit
    • Theodore Ts'o's avatar
      ext4: Use tracepoints for mb_history trace file · 296c355c
      Theodore Ts'o authored 
      The /proc/fs/ext4/<dev>/mb_history was maintained manually, and had a
number of problems: it required a largish amount of memory to be
allocated for each ext4 filesystem, and the s_mb_history_lock
introduced a CPU contention problem.  

By ripping out the mb_history code and replacing it with ftrace
tracepoints, and we get more functionality: timestamps, event
filtering, the ability to correlate mballoc history with other ext4
tracepoints, etc.
Signed-off-by: default avatar"Theodore Ts'o" <tytso@mit.edu>
      296c355c
  3. 29 Sep, 2009 4 commits
  5. 28 Sep, 2009 5 commits
    • Theodore Ts'o's avatar
      ext4: EXT4_IOC_MOVE_EXT: Check for different original and donor inodes first · f3ce8064
      Theodore Ts'o authored 
      Move the check to make sure the original and donor inodes are
different earlier, to avoid a potential deadlock by trying to lock the
same inode twice.
Signed-off-by: default avatar"Theodore Ts'o" <tytso@mit.edu>
      f3ce8064
    • Mingming Cao's avatar
      ext4: async direct IO for holes and fallocate support · 8d5d02e6
      Mingming Cao authored 
      For async direct IO that covers holes or fallocate, the end_io
callback function now queued the convertion work on workqueue but
don't flush the work rightaway as it might take too long to afford.

But when fsync is called after all the data is completed, user expects
the metadata also being updated before fsync returns.

Thus we need to flush the conversion work when fsync() is called.
This patch keep track of a listed of completed async direct io that
has a work queued on workqueue.  When fsync() is called, it will go
through the list and do the conversion.
Signed-off-by: default avatarMingming Cao <cmm@us.ibm.com>
      8d5d02e6
    • Mingming Cao's avatar
      ext4: Use end_io callback to avoid direct I/O fallback to buffered I/O · 4c0425ff
      Mingming Cao authored 
      Currently the DIO VFS code passes create = 0 when writing to the
middle of file.  It does this to avoid block allocation for holes, so
as not to expose stale data out when there is a parallel buffered read
(which does not hold the i_mutex lock).  Direct I/O writes into holes
falls back to buffered IO for this reason.

Since preallocated extents are treated as holes when doing a
get_block() look up (buffer is not mapped), direct IO over fallocate
also falls back to buffered IO.  Thus ext4 actually silently falls
back to buffered IO in above two cases, which is undesirable.

To fix this, this patch creates unitialized extents when a direct I/O
write into holes in sparse files, and registering an end_io callback which
converts the uninitialized extent to an initialized extent after the
I/O is completed.
Singed-Off-By: default avatarMingming Cao <cmm@us.ibm.com>
Signed-off-by: default avatar"Theodore Ts'o" <tytso@mit.edu>
      4c0425ff
    • Mingming Cao's avatar
      ext4: Split uninitialized extents for direct I/O · 0031462b
      Mingming Cao authored 
      When writing into an unitialized extent via direct I/O, and the direct
I/O doesn't exactly cover the unitialized extent, split the extent
into uninitialized and initialized extents before submitting the I/O.
This avoids needing to deal with an ENOSPC error in the end_io
callback that gets used for direct I/O.

When the IO is complete, the written extent will be marked as initialized.

Singed-Off-By: Mingming Cao <cmm@us.ibm.com> 
Signed-off-by: default avatar"Theodore Ts'o" <tytso@mit.edu>
      0031462b
    • Mingming Cao's avatar
      ext4: release reserved quota when block reservation for delalloc retry · 9f0ccfd8
      Mingming Cao authored 
      ext4_da_reserve_space() can reserve quota blocks multiple times if
ext4_claim_free_blocks() fail and we retry the allocation. We should
release the quota reservation before restarting.

Bug found by Jan Kara.
Signed-off-by: default avatarMingming Cao <cmm@us.ibm.com>
Signed-off-by: default avatar"Theodore Ts'o" <tytso@mit.edu>
      9f0ccfd8
  7. 29 Sep, 2009 1 commit
    • Theodore Ts'o's avatar
      ext4: Adjust ext4_da_writepages() to write out larger contiguous chunks · 55138e0b
      Theodore Ts'o authored 
      Work around problems in the writeback code to force out writebacks in
larger chunks than just 4mb, which is just too small.  This also works
around limitations in the ext4 block allocator, which can't allocate
more than 2048 blocks at a time.  So we need to defeat the round-robin
characteristics of the writeback code and try to write out as many
blocks in one inode before allowing the writeback code to move on to
another inode.  We add a a new per-filesystem tunable,
max_writeback_mb_bump, which caps this to a default of 128mb per
inode.
Signed-off-by: default avatar"Theodore Ts'o" <tytso@mit.edu>
      55138e0b
  9. 28 Sep, 2009 1 commit
  11. 26 Sep, 2009 1 commit
  13. 29 Sep, 2009 1 commit
  15. 25 Sep, 2009 26 commits
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