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In the "if (extlen)" case, "bh" was used uninitialized.
This patch changes the code to what seems to have been intended.
Spotted by the Coverity checker.
This patch also removes a pointless "bh = NULL" asignment (the variable
is never accessed again after this point).
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
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Don't dereference new->s_root when we do know it's NULL.
Spotted by the Coverity checker.
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
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In the "if (extlen)" case, "new" might be used uninitialized.
Looking at the code, it should be initialized to 0.
Spotted by the Coverity checker.
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
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The Coverity checker spotted this unused variable.
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
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The Coverity checker spotted this obviously dead code.
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
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This fix means that bmap will map extents of the length requested
by the VFS rather than guessing at it, or just mapping one block
at a time. The other callers of gfs2_block_map are audited to ensure
they send the correct max extent lengths (i.e. set bh->b_size correctly).
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
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Pass kaddr rather than (incorrect) struct page to kunmap_atomic.
Signed-off-by: Russell Cattelan <cattelan@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
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The log lock needs to be held when manipulating the counter
for the number of free journal blocks.
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
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This fixes a bug where, in certain cases an uninitialised variable
could cause a dereference of a NULL pointer in gfs2_commit_write().
Also a typo in a comment is fixed at the same time.
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
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Fix a size calculation error.
The size was incorrect being computed as a
negative length and then being passed to an
unsigned parameter.
This in turn would cause the allocator to
think it needed enough meta data to store
a gigabyte file for every file created.
Signed-off-by: Russell Cattelan <cattelan@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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Missing endian conversion for the de_type field.
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
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This patch has gfs2_security_init declared as a static function, which
is correct. As a result, the declaration of this function in inode.h is
removed (and thus inode.h is unchanged). Also removed #include eaops.h,
which is not needed.
Signed-Off-By: Ryan O'Hara <rohara@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
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This moves the logging code from meta_io.c into log.c and glops.c. As a
result the routines can now be static and all the logging code is together
in log.c, leaving meta_io.c with just metadata i/o code in it.
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
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This does nothing atm, but will be required for later support of
r/o bind mounts.
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
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Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
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In many places GFS2 was calling the endian conversion routines
for an inode even when only a single field, or a few fields might
have changed. As a result we were copying lots of data needlessly.
This patch replaces those calls with conversion of just the
required fields in each case. This should be faster and easier
to understand. There are still other places which suffer from this
problem, but this is a start in the right direction.
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
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For some reason we had two different sets of code for reading in the
superblock. This removes one of them in favour of the other. Also we
don't need the temporary buffer for the sb since we already have one
in the gfs2 sb itself.
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
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Mark the metadata reads so that blktrace knows what they are.
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
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Update GFS2 in the light of David Howells' patch:
[PATCH] BLOCK: Move common FS-specific ioctls to linux/fs.h [try #6]
36695673b012096228ebdc1b39a6a5850daa474e
which calls the filesystem independant flags FS_..._FL. As a result
we no longer need the flags.h file and the conversion routine is
moved into the GFS2 source code.
Userland programs which used to include iflags.h should now include
fs.h and use the new flag names.
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
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Fix a couple of minor issues.
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
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Fix GFS for streamline-generic_file_-interfaces-and-filemap.patch
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
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This patch removes readv() and writev() methods and replaces them with
aio_read()/aio_write() methods.
Signed-off-by: Badari Pulavarty <pbadari@us.ibm.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
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This eliminates the i_blksize field from struct inode. Filesystems that want
to provide a per-inode st_blksize can do so by providing their own getattr
routine instead of using the generic_fillattr() function.
Note that some filesystems were providing pretty much random (and incorrect)
values for i_blksize.
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Cc: Steven Whitehouse <swhiteho@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
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The following patches reduce the size of the VFS inode structure by 28 bytes
on a UP x86. (It would be more on an x86_64 system). This is a 10% reduction
in the inode size on a UP kernel that is configured in a production mode
(i.e., with no spinlock or other debugging functions enabled; if you want to
save memory taken up by in-core inodes, the first thing you should do is
disable the debugging options; they are responsible for a huge amount of bloat
in the VFS inode structure).
This patch:
The filesystem or device-specific pointer in the inode is inside a union,
which is pretty pointless given that all 30+ users of this field have been
using the void pointer. Get rid of the union and rename it to i_private, with
a comment to explain who is allowed to use the void pointer. This is just a
cleanup, but it allows us to reuse the union 'u' for something something where
the union will actually be used.
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Cc: Steven Whitehouse <swhiteho@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
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The Makefile had the wrong CONFIG_ variable in it so that in
case GFS2 was y and the lock modules were m, they were not
getting built properly.
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
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As per Andrew Morton's request, removed trailing whitespace.
Cc: Andrew Morton <akpm@osdl.org>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
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Fix a bug in the directory reading code, where we might have dereferenced
a NULL pointer in case of OOM. Updated the directory code to use the new
& improved version of gfs2_meta_ra() which now returns the first block
that was being read. Previously it was releasing it requiring following
code to grab the block again at each point it was called.
Also turned off readahead on directory lookups since we are reading a
hash table, and therefore reading the entries in order is very
unlikely. Readahead is still used for all other calls to the
directory reading function (e.g. when growing the hash table).
Removed the DIO_START constant. Everywhere this was used, it was
used to unconditionally start i/o aside from a couple of places, so
I've removed it and made the couple of exceptions to this rule into
separate functions.
Also hunted through the other DIO flags and removed them as arguments
from functions which were always called with the same combination of
arguments.
Updated gfs2_meta_indirect_buffer to be a bit more efficient and
hopefully also be a bit easier to read.
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
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Three of the DIO constants were not being used, so remove them.
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
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This code path shouldn't be needed, so remove it for now. This
tidys things up.
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
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This is an attempt to fix Red Hat bz 204364. I don't hit it all
the time, but with these changes, running postmark which used to
trigger it on a regular basis no longer appears to. So I'm not
saying that its 100% certain that its fixed, but it does look
promising at the moment.
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
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lm_interface.h has a few out of the tree clients such as GFS1
and userland tools.
Right now, these clients keeps a copy of the file in their build tree
that can go out of sync.
Move lm_interface.h to include/linux, export it to userland and
clean up fs/gfs2 to use the new location.
Signed-off-by: Fabio M. Di Nitto <fabbione@ubuntu.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
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i_blksize got removed in -mm.
Cc: Steven Whitehouse <swhiteho@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
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This make the unlock test a bit simpler.
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
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Fix for Red Hat bz 205307. Don't need to lock in readpage if
the higher level code has already grabbed the lock.
Signed-off-by: Russell Cattelan <cattelan@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
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This is a tidy up of the GFS2 bmap code. The main change is that the
bh is passed to gfs2_block_map allowing the flags to be set directly
rather than having to repeat that code several times in ops_address.c.
At the same time, the extent mapping code from gfs2_extent_map has
been moved into gfs2_block_map. This allows all calls to gfs2_block_map
to map extents in the case that no allocation is taking place. As a
result reads and non-allocating writes should be faster. A quick test
with postmark appears to support this.
There is a limit on the number of blocks mapped in a single bmap
call in that it will only ever map blocks which are pointed to
from a single pointer block. So in other words, it will never try
to do additional i/o in order to satisfy read-ahead. The maximum
number of blocks is thus somewhat less than 512 (the GFS2 4k block
size minus the header divided by sizeof(u64)). I've further limited
the mapping of "normal" blocks to 32 blocks (to avoid extra work)
since readpages() will currently read a maximum of 32 blocks ahead (128k).
Some further work will probably be needed to set a suitable value
for DIO as well, but for now thats left at the maximum 512 (see
ops_address.c:gfs2_get_block_direct).
There is probably a lot more that can be done to improve bmap for GFS2,
but this is a good first step.
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
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Print an error message if mount fails in setting up the sysfs files.
Signed-off-by: David Teigland <teigland@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
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A one liner bug fix to prevent the return value being
wrong when more than one superblock is mounted.
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
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Based upon previous feedback from lkml and also removing some
commented out debugging which is no longer needed.
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
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Use atomic_t as the ref count in glocks rather than a kref.
This is another step towards using RCU for the glock hash.
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
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This results in smaller list heads, so that we can have more chains
in the same amount of memory (twice as many). I've multiplied the
size of the table by four though - this is because we are saving
memory by not having one lock per chain any more. So we land up
using about the same amount of memory for the hash table as we
did before I started these changes, the difference being that we
now have four times as many hash chains.
The reason that I say "about the same amount of memory" is that the
actual amount now depends upon the NR_CPUS and some of the config
variables, so that its not exact and in some cases we do use more
memory. Eventually we might want to scale the hash table size
according to the size of physical ram as measured on module load.
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
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The existing implementation of this function in glock.c was not
very efficient as it relied upon keeping a cursor element upon the
hash chain in question and moving it along. This new version improves
upon this by using the current element as a cursor. This is possible
since we only look at the "next" element in the list after we've
taken the read_lock() subsequent to calling the examiner function.
Obviously we have to eventually drop the ref count that we are then
left with and we cannot do that while holding the read_lock, so we
do that next time we drop the lock. That means either just before
we examine another glock, or when the loop has terminated.
The new implementation has several advantages: it uses only a
read_lock() rather than a write_lock(), so it can run simnultaneously
with other code, it doesn't need a "plug" element, so that it removes
a test not only from this list iterator, but from all the other glock
list iterators too. So it makes things faster and smaller.
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
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The callback for iopen locks is unused, so this removes
it.
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
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Add back the consts which were casted away in the glock sorting
function. Also add early exit code.
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
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Make the number of locks used for hash chains in glock.c
proportional to NR_CPUS. Also move constants for the number
of hash chains into glock.c from incore.h since they are
not used outside of glock.c.
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
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The superblock is now created with kmalloc, not vmalloc.
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
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This splits the rwlocks guarding the hash chains of the glock hash
table into their own array. This will reduce memory usage in some
cases due to better alignment, although the real reason for doing it
is to allow the two tables to be different sizes in future (i.e.
the locks will be sized proportionally with the max number of CPUs
and the hash chains sized proportinally with the size of physical memory)
In order to allow this, the gl_bucket member of struct gfs2_glock has
now become gl_hash, so we record the hash rather than a pointer to the
bucket itself.
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
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As requested by Jan Engelhardt, this removes the typedefs in the
locking module interface and replaces them with void *. Also
since we are changing the interface, I've added a few consts
as well.
Cc: Jan Engelhardt <jengelh@linux01.gwdg.de>
Cc: David Teigland <teigland@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
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This was missed in an earlier patch when changing over from vmalloc
to kmalloc for the superblock.
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
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Adrian Bunk
Al Viro
Steven Whitehouse
Russell Cattelan
Ryan O'Hara
Andrew Morton
Badari Pulavarty
Theodore Ts'o
Fabio Massimo Di Nitto
David Teigland