Commit Graph

1950 Commits

Author SHA1 Message Date
Bob Peterson 3e7aafc39c GFS2: Minor improvements to comments and documentation
This patch simply fixes some comments and the gfs2-glocks.txt file:
Places where i_rwsem was called i_mutex, and adding i_rw_mutex.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
2018-04-12 10:07:51 -07:00
Andreas Gruenbacher 3fd5d3ad35 gfs2: Stop using rhashtable_walk_peek
Function rhashtable_walk_peek is problematic because there is no
guarantee that the glock previously returned still exists; when that key
is deleted, rhashtable_walk_peek can end up returning a different key,
which will cause an inconsistent glock dump.  Fix this by keeping track
of the current glock in the seq file iterator functions instead.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
2018-04-12 09:41:19 -07:00
Linus Torvalds 9022ca6b11 Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Pull misc vfs updates from Al Viro:
 "Assorted stuff, including Christoph's I_DIRTY patches"

* 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  fs: move I_DIRTY_INODE to fs.h
  ubifs: fix bogus __mark_inode_dirty(I_DIRTY_SYNC | I_DIRTY_DATASYNC) call
  ntfs: fix bogus __mark_inode_dirty(I_DIRTY_SYNC | I_DIRTY_DATASYNC) call
  gfs2: fix bogus __mark_inode_dirty(I_DIRTY_SYNC | I_DIRTY_DATASYNC) calls
  fs: fold open_check_o_direct into do_dentry_open
  vfs: Replace stray non-ASCII homoglyph characters with their ASCII equivalents
  vfs: make sure struct filename->iname is word-aligned
  get rid of pointless includes of fs_struct.h
  [poll] annotate SAA6588_CMD_POLL users
2018-04-06 11:07:08 -07:00
Abhi Das 5e86d9d122 gfs2: time journal recovery steps accurately
This patch spits out the time taken by the various steps in the
journal recover process. Previously, the journal recovery time
didn't account for finding the journal head in the log which takes
up a significant portion of time.

Signed-off-by: Abhi Das <adas@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
2018-03-29 10:41:27 -07:00
Andreas Gruenbacher fffb64127a gfs2: Zero out fallocated blocks in fallocate_chunk
Instead of zeroing out fallocated blocks in gfs2_iomap_alloc, zero them
out in fallocate_chunk, much higher up the call stack.  This gets rid of
gfs2's abuse of the IOMAP_ZERO flag as well as the gfs2 specific zeronew
buffer flag.  I can't think of a reason why zeroing out the blocks in
gfs2_iomap_alloc would have any benefits: there is no additional locking
at that level that would add protection to the newly allocated blocks.

While at it, change fallocate over from gs2_block_map to gfs2_iomap_begin.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Acked-by: Christoph Hellwig <hch@lst.de>
2018-03-29 06:50:32 -07:00
Christoph Hellwig 0e11f6443f fs: move I_DIRTY_INODE to fs.h
And use it in a few more places rather than opencoding the values.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2018-03-28 01:39:02 -04:00
Christoph Hellwig 937d330512 gfs2: fix bogus __mark_inode_dirty(I_DIRTY_SYNC | I_DIRTY_DATASYNC) calls
I_DIRTY_DATASYNC is a strict superset of I_DIRTY_SYNC semantics, as
in mark dirty to be written out by fdatasync as well.  So dirtying
for both flags makes no sense.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2018-03-28 01:39:01 -04:00
Andreas Gruenbacher bb491ce67a gfs2: Check for the end of metadata in punch_hole
When punching a hole or truncating an inode down to a given size, also
check if the truncate point / start of the hole is within the range we
have metadata for.  Otherwise, we can end up freeing blocks that
shouldn't be freed, corrupting the inode, or crashing the machine when
trying to punch a hole into the void.

When growing an inode via truncate, we set the new size but we don't
allocate additional levels of indirect blocks and grow the inode height.
When shrinking that inode again, the new size may still point beyond the
end of the inode's metadata.

Fixes xfstest generic/476.

Debugged-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
2018-03-23 11:43:02 -07:00
Andreas Gruenbacher ee6ed857c8 gfs2: gfs2_iomap_end tracepoint: log block address
In the gfs2_iomap_end tracepoint, log the physical block address, just
as in the gfs2_bmap tracepoint.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
2018-03-15 07:17:17 -07:00
Andreas Gruenbacher d39d18e0ef gfs2: Improve gfs2_block_map comment
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
2018-03-08 09:26:20 -07:00
Bob Peterson b9e03f1861 GFS2: Only set PageChecked for jdata pages
Before this patch, GFS2 was setting the PageChecked flag for ordered
write pages. This is unnecessary. The ext3 file system only does it
for jdata, and it's only used in jdata circumstances. It only muddies
the already murky waters of writing pages in the aops.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
2018-03-08 09:26:20 -07:00
Bob Peterson 9bc980cdb9 GFS2: Make function gfs2_remove_from_ail static
Function gfs2_remove_from_ail is only ever used from log.c, so there
is no reason to declare it extern. This patch removes the extern and
declares it static.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
2018-03-08 09:26:20 -07:00
Andreas Gruenbacher 83998ccd9b gfs2: Dirty source inode during rename
Mark the source inode dirty during a rename instead of just updating the
underlying buffer head.  Otherwise, fsync may find the inode clean and
will then skip flushing the journal.  A subsequent power failure will
cause the rename to be lost.  This happens in command sequences like:

  xfs_io -f -c 'pwrite 0 4096' -c 'fsync' foo
  mv foo bar
  xfs_io -c 'fsync' bar
  # power failure

Fixes xfstests generic/322, generic/376.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
2018-03-08 09:26:20 -07:00
Andreas Gruenbacher 174d1232eb gfs2: Fix fallocate chunk size
The chunk size of allocations in __gfs2_fallocate is calculated
incorrectly.  The size can collapse, causing __gfs2_fallocate to
allocate one block at a time, which is very inefficient.  This needs
fixing in two places:

In gfs2_quota_lock_check, always set ap->allowed to UINT_MAX to indicate
that there is no quota limit.  This fixes callers that rely on
ap->allowed to be set even when quotas are off.

In __gfs2_fallocate, reset max_blks to UINT_MAX in each iteration of the
loop to make sure that allocation limits from one resource group won't
spill over into another resource group.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
2018-03-08 09:26:20 -07:00
Andreas Gruenbacher 3b5da96e45 gfs2: Fixes to "Implement iomap for block_map" (2)
It turns out that commit 3229c18c0d6b2 'Fixes to "Implement iomap for
block_map"' introduced another bug in gfs2_iomap_begin that can cause
gfs2_block_map to set bh->b_size of an actual buffer to 0.  This can
lead to arbitrary incorrect behavior including crashes or disk
corruption.  Revert the incorrect part of that commit.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
2018-03-07 11:40:38 -07:00
Andreas Gruenbacher 49edd5bf42 gfs2: Fixes to "Implement iomap for block_map"
It turns out that commit 3974320ca6 "Implement iomap for block_map"
introduced a few bugs that trigger occasional failures with xfstest
generic/476:

In gfs2_iomap_begin, we jump to do_alloc when we determine that we are
beyond the end of the allocated metadata (height > ip->i_height).
There, we can end up calling hole_size with a metapath that doesn't
match the current metadata tree, which doesn't make sense.  After
untangling the code at do_alloc, fix this by checking if the block we
are looking for is within the range of allocated metadata.

In addition, add a BUG() in case gfs2_iomap_begin is accidentally called
for reading stuffed files: this is handled separately.  Make sure we
don't truncate iomap->length for reads beyond the end of the file; in
that case, the entire range counts as a hole.

Finally, revert to taking a bitmap write lock when doing allocations.
It's unclear why that change didn't lead to any failures during testing.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
2018-02-13 13:38:10 -07:00
Andreas Gruenbacher 7ac07fdaf8 gfs2: Glock dump performance regression fix
Restore an optimization removed in commit 7f19449553 "Fix debugfs glocks
dump": keep the glock hash table iterator active while the glock dump
file is held open.  This avoids having to rescan the hash table from the
start for each read, with quadratically rising runtime.

In addition, use rhastable_walk_peek for resuming a glock dump at the
current position: when a glock doesn't fit in the provided buffer
anymore, the next read must revisit the same glock.

Finally, also restart the dump from the first entry when we notice that
the hash table has been resized in gfs2_glock_seq_start.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
2018-02-01 11:27:11 -07:00
Andreas Gruenbacher dcb2cd55cf gfs2: Fix the crc32c dependency
Depend on LIBCRC32C which uses the crypto API to select the appropriate
crc32c implementation.  With the CRYPTO and CRYPTO_CRC32C dependencies,
gfs2 would still need to use the crypto API directly like ext4 and btrfs
do, which isn't necessary.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
2018-02-01 11:25:31 -07:00
Linus Torvalds b2fe5fa686 Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next
Pull networking updates from David Miller:

 1) Significantly shrink the core networking routing structures. Result
    of http://vger.kernel.org/~davem/seoul2017_netdev_keynote.pdf

 2) Add netdevsim driver for testing various offloads, from Jakub
    Kicinski.

 3) Support cross-chip FDB operations in DSA, from Vivien Didelot.

 4) Add a 2nd listener hash table for TCP, similar to what was done for
    UDP. From Martin KaFai Lau.

 5) Add eBPF based queue selection to tun, from Jason Wang.

 6) Lockless qdisc support, from John Fastabend.

 7) SCTP stream interleave support, from Xin Long.

 8) Smoother TCP receive autotuning, from Eric Dumazet.

 9) Lots of erspan tunneling enhancements, from William Tu.

10) Add true function call support to BPF, from Alexei Starovoitov.

11) Add explicit support for GRO HW offloading, from Michael Chan.

12) Support extack generation in more netlink subsystems. From Alexander
    Aring, Quentin Monnet, and Jakub Kicinski.

13) Add 1000BaseX, flow control, and EEE support to mvneta driver. From
    Russell King.

14) Add flow table abstraction to netfilter, from Pablo Neira Ayuso.

15) Many improvements and simplifications to the NFP driver bpf JIT,
    from Jakub Kicinski.

16) Support for ipv6 non-equal cost multipath routing, from Ido
    Schimmel.

17) Add resource abstration to devlink, from Arkadi Sharshevsky.

18) Packet scheduler classifier shared filter block support, from Jiri
    Pirko.

19) Avoid locking in act_csum, from Davide Caratti.

20) devinet_ioctl() simplifications from Al viro.

21) More TCP bpf improvements from Lawrence Brakmo.

22) Add support for onlink ipv6 route flag, similar to ipv4, from David
    Ahern.

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next: (1925 commits)
  tls: Add support for encryption using async offload accelerator
  ip6mr: fix stale iterator
  net/sched: kconfig: Remove blank help texts
  openvswitch: meter: Use 64-bit arithmetic instead of 32-bit
  tcp_nv: fix potential integer overflow in tcpnv_acked
  r8169: fix RTL8168EP take too long to complete driver initialization.
  qmi_wwan: Add support for Quectel EP06
  rtnetlink: enable IFLA_IF_NETNSID for RTM_NEWLINK
  ipmr: Fix ptrdiff_t print formatting
  ibmvnic: Wait for device response when changing MAC
  qlcnic: fix deadlock bug
  tcp: release sk_frag.page in tcp_disconnect
  ipv4: Get the address of interface correctly.
  net_sched: gen_estimator: fix lockdep splat
  net: macb: Handle HRESP error
  net/mlx5e: IPoIB, Fix copy-paste bug in flow steering refactoring
  ipv6: addrconf: break critical section in addrconf_verify_rtnl()
  ipv6: change route cache aging logic
  i40e/i40evf: Update DESC_NEEDED value to reflect larger value
  bnxt_en: cleanup DIM work on device shutdown
  ...
2018-01-31 14:31:10 -08:00
Andreas Gruenbacher af38816e48 gfs2: Add a few missing newlines in messages
Some of the info, warning, and error messages are missing their trailing
newline.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
2018-01-30 10:32:30 -07:00
Abhi Das 957a7acd46 gfs2: Remove inode from ordered write list in gfs2_write_inode()
The vfs clears the I_DIRTY inode flag before calling gfs2_write_inode()
having queued any data that needed to be written to disk.
This is a good time to remove such inodes from our ordered write list
so they don't hang around for long periods of time.

Signed-off-by: Abhi Das <adas@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
2018-01-30 10:00:27 -07:00
Bob Peterson 2eb5909dee GFS2: Don't try to end a non-existent transaction in unlink
Before this patch, if function gfs2_unlink failed to get a valid
transaction (for example, not enough journal blocks) it would go
to label out_end_trans which did gfs2_trans_end. But if the
trans_begin failed, there's no transaction to end, and trying to
do so results in: kernel BUG at fs/gfs2/trans.c:117!

This patch changes the goto so that it does not try to end a
non-existent transaction.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
2018-01-29 10:00:23 -07:00
Bob Peterson 4519eaad72 GFS2: Fix minor comment typo
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
2018-01-25 10:18:06 -07:00
Bob Peterson 805c090750 GFS2: Log the reason for log flushes in every log header
This patch just adds the capability for GFS2 to track which function
called gfs2_log_flush. This should make it easier to diagnose
problems based on the sequence of events found in the journals.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Reviewed-by: Andreas Gruenbacher <agruenba@redhat.com>
2018-01-23 07:39:20 -07:00
Bob Peterson c1696fb85d GFS2: Introduce new gfs2_log_header_v2
This patch adds a new structure called gfs2_log_header_v2 which is used
to store expanded fields into previously unused areas of the log headers
(i.e., this change is backwards compatible).  Some of these are used for
debug purposes so we can backtrack when problems occur.  Others are
reserved for future expansion.

This patch is based on a prototype from Steve Whitehouse.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
2018-01-23 07:38:53 -07:00
Andreas Gruenbacher 0ff5916ad4 gfs2: Get rid of gfs2_log_header_in
Get rid of gfs2_log_header_in by integrating it into get_log_header.
Clean up the crc32 computations and use the same functions for encoding
and decoding to make things less confusing.  Eliminate lh_hash from
gfs2_log_header_host which is completely useless.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
2018-01-22 07:06:15 -07:00
Andreas Gruenbacher 88b65ce5fd gfs2: Minor gfs2_page_add_databufs cleanup
The to parameter of gfs2_page_add_databufs is passed inconsistently:
once as from + len, once as from + len - 1.  Just pass len instead.

In addition, once we're past the end, we can immediately break out of
the loop.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
2018-01-18 14:18:55 -07:00
Andreas Gruenbacher 235628c5c7 gfs2: Add gfs2_max_stuffed_size
Add a small inline function for computing the maximum size of a stuffed
inode instead of open coding that in several places throughout the code.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
2018-01-18 14:18:53 -07:00
Andreas Gruenbacher 9db115a0e3 gfs2: Typo fixes
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
2018-01-18 14:18:49 -07:00
Bob Peterson 786ebd9f68 Merge branch 'punch-hole' of git://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux-gfs2.git 2018-01-18 14:17:13 -07:00
Andreas Gruenbacher 4e56a6411f gfs2: Implement fallocate(FALLOC_FL_PUNCH_HOLE)
Implement the top-level bits of punching a hole into a file.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
2018-01-18 21:15:58 +01:00
Andreas Gruenbacher 10d2cf94c2 gfs2: Turn trunc_dealloc into punch_hole
Add an upper bound to the range of blocks to deallocate blocks to
function trunc_dealloc so that this function can be used for truncating
a file as well as for punching a hole into a file.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
2018-01-18 21:15:57 +01:00
Andreas Gruenbacher 5cf26b1e88 gfs2: Generalize truncate code
Pull the code for computing the range of metapointers to iterate out of
gfs2_metapath_ra (for readahead), sweep_bh_for_rgrps (for deallocating
metapointers within a block), and trunc_dealloc (for walking the
metadata tree).

In sweep_bh_for_rgrps, move the code for looking up the resource group
descriptor of the current resource group out of the inner loop.  The
metatype check moves to trunc_dealloc.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
2018-01-18 21:15:37 +01:00
Andreas Gruenbacher bdba0d5ec1 Turn gfs2_block_truncate_page into gfs2_block_zero_range
Turn gfs2_block_truncate_page into a function that zeroes a range within
a block rather than only the end of a block.  This will be used for
cleaning the end of the first partial block and the start of the last
partial block when punching a hole in a file.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
2018-01-17 06:35:53 -07:00
Andreas Gruenbacher cb7f0903ef gfs2: Improve non-recursive delete algorithm
In rare cases, the current non-recursive delete algorithm doesn't
deallocate empty intermediary indirect blocks.  This should have very
little practical effect, but deallocating all blocks correctly should
still be preferable as it is cleaner and easier to validate.

The fix consists of using the first block to deallocate to compute the
start marker of the truncate point instead of the last block that needs
to be kept.  With that change, computing which indirect blocks are still
needed becomes relatively easy.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
2018-01-17 06:35:52 -07:00
Andreas Gruenbacher c3ce5aa9b0 gfs2: Fix metadata read-ahead during truncate
The metadata read-ahead algorithm broke when switching from recursive to
non-recursive delete: the current algorithm reads ahead blocks at height
N - 1 while deallocating the blocks at hight N.  However, deallocating
the blocks at height N requires a complete walk of the metadata tree,
not only down to height N - 1.  Consequently, all blocks below height
N - 1 will be accessed without read-ahead.

Fix this by issuing read-aheads as early as possible, after each
metapath lookup.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
2018-01-17 06:35:50 -07:00
Andreas Gruenbacher e8b43fe0c1 gfs2: Clean up {lookup,fillup}_metapath
Split out the entire lookup loop from lookup_metapath and
fillup_metapath.  Make both functions return the actual height in
mp->mp_aheight, and return 0 on success.  Handle lookup errors properly
in trunc_dealloc.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
2018-01-17 06:35:48 -07:00
Andreas Gruenbacher e7fdf00406 gfs2: Remove minor gfs2_journaled_truncate inefficiencies
First, this function truncates the file in chunks.  When the original
file size isn't block aligned, each chunk that is truncated will remain
be misaligned.  This is inefficient.

Second, this function doesn't recognize where holes are, so it loops
through them.  For each chunk of a hole, it creates a new transaction.
At least avoid creating another transactions whe the current one is
still empty.  (An better fix would be to skip large holes, of course.)

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
2018-01-17 06:35:47 -07:00
Andreas Gruenbacher 8b5860a35c gfs2: truncate: Remove unnecessary oldsize parameters
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
2018-01-17 06:35:45 -07:00
Andreas Gruenbacher 80990f404d gfs2: Clean up trunc_start error path
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
2018-01-17 06:35:42 -07:00
Andreas Gruenbacher da5eb9cdda gfs2: Remove pointless BUG_ON
The current transaction is being dereferenced before asserting that is
not NULL; that isn't going to help.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
2018-01-17 06:35:35 -07:00
Steven Whitehouse 90bcab998d gfs2: Add gfs2_blk2rgrpd comment and fix incorrect use
Document when to use gfs2_blk2rgrpd for "inexact" resource group
matching.  Based on that, fix an incorrect use of gfs2_blk2rgrpd in
sweep_bh_for_rgrps.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
2018-01-17 06:34:24 -07:00
Abhi Das 1f23bc7869 gfs2: Trim the ordered write list in gfs2_ordered_write()
We iterate through the entire ordered writes list in
gfs2_ordered_write() to write out inodes. It's a good
place to try and shrink the list by throwing out inodes
that don't have any pages.

Signed-off-by: Abhi Das <adas@redhat.com>
Acked-by: Steven Whitehouse <swhiteho@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
2017-12-22 07:55:31 -06:00
Bob Peterson 588bff95c9 GFS2: Reduce code redundancy writing log headers
Before this patch, there was a lot of code redundancy between functions
log_write_header (which uses bio) and clean_journal (which uses
buffer_head). This patch reduces the redundancy to simplify the code
and make log header writing more consistent. We want more consistency
and reduced redundancy because we plan to add a bunch of new fields
to improve performance (by eliminating the local statfs and quota files)
improve metadata integrity (by adding new crcs and such) and for better
debugging (by adding new fields to track when and where metadata was
pushed through the journals.) We don't want to duplicate setting these
new fields, nor allow for human error in the process.

This reduction in code redundancy is accomplished by introducing a new
helper function, gfs2_write_log_header which uses bio rather than bh.
That simplifies recovery function clean_journal() to use the new helper
function and iomap rather than redundancy and block_map (and eventually
we can maybe remove block_map). It also reduces our dependency on
buffer_heads.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
2017-12-22 07:51:29 -06:00
Andrew Price 850d2d915f gfs2: Add a crc field to resource group headers
Add the rg_crc field to store a crc32 of the gfs2_rgrp structure. This
allows us to check resource group headers' integrity and removes the
requirement to check them against the rindex entries in fsck. If this
field is found to be zero, it should be ignored (or updated with an
accurate value).

Signed-off-by: Andrew Price <anprice@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
2017-12-12 11:43:42 -06:00
Andrew Price 166725d963 gfs2: Add rindex fields to rgrp headers
Add rg_data0, rg_data and rg_bitbytes to struct gfs2_rgrp. The fields
are identical to their counterparts in struct gfs2_rindex and are
intended to reduce the use of the rindex. For now the fields are only
written back as the in-memory equivalents in struct gfs2_rgrpd are set
using values from the rindex. However, they are needed at this point so
that userspace can make use of them, allowing a migration away from the
rindex over time.

The new fields take up previously reserved space which was explicitly
zeroed on write so, in clusters with mixed kernels, these fields could
get zeroed after being set and this should not be treated as an error.

Signed-off-by: Andrew Price <anprice@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
2017-12-12 11:43:36 -06:00
Andrew Price 65adc27375 gfs2: Add a next-resource-group pointer to resource groups
Add a new rg_skip field to struct gfs2_rgrp, replacing __pad. The
rg_skip field has the following meaning:

- If rg_skip is zero, it is considered unset and not useful.
- If rg_skip is non-zero, its value will be the number of blocks between
  this rgrp's address and the next rgrp's address. This can be used as a
  hint by fsck.gfs2 when rebuilding a bad rindex, for example.

This will provide less dependency on the rindex in future, and allow
tools such as fsck.gfs2 to iterate the resource groups without keeping
the rindex around.

The field is updated in gfs2_rgrp_out() so that existing file systems
will have it set. This means that any resource groups that aren't ever
written will not be updated. The final rgrp is a special case as there
is no next rgrp, so it will always have a rg_skip of 0 (unless the fs is
extended).

Before this patch, gfs2_rgrp_out() zeroes the __pad field explicitly, so
the rg_skip field can get set back to 0 in cases where nodes with and
without this patch are mixed in a cluster. In some cases, the field may
bounce between being set by one node and then zeroed by another which
may harm performance slightly, e.g. when two nodes create many small
files. In testing this situation is rare but it becomes more likely as
the filesystem fills up and there are fewer resource groups to choose
from. The problem goes away when all nodes are running with this patch.
Dipping into the space currently occupied by the rg_reserved field would
have resulted in the same problem as it is also explicitly zeroed, so
unfortunately there is no other way around it.

Signed-off-by: Andrew Price <anprice@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
2017-12-12 11:43:08 -06:00
Tom Herbert 97a6ec4ac0 rhashtable: Change rhashtable_walk_start to return void
Most callers of rhashtable_walk_start don't care about a resize event
which is indicated by a return value of -EAGAIN. So calls to
rhashtable_walk_start are wrapped wih code to ignore -EAGAIN. Something
like this is common:

       ret = rhashtable_walk_start(rhiter);
       if (ret && ret != -EAGAIN)
               goto out;

Since zero and -EAGAIN are the only possible return values from the
function this check is pointless. The condition never evaluates to true.

This patch changes rhashtable_walk_start to return void. This simplifies
code for the callers that ignore -EAGAIN. For the few cases where the
caller cares about the resize event, particularly where the table can be
walked in mulitple parts for netlink or seq file dump, the function
rhashtable_walk_start_check has been added that returns -EAGAIN on a
resize event.

Signed-off-by: Tom Herbert <tom@quantonium.net>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
2017-12-11 09:58:38 -05:00
Linus Torvalds 1751e8a6cb Rename superblock flags (MS_xyz -> SB_xyz)
This is a pure automated search-and-replace of the internal kernel
superblock flags.

The s_flags are now called SB_*, with the names and the values for the
moment mirroring the MS_* flags that they're equivalent to.

Note how the MS_xyz flags are the ones passed to the mount system call,
while the SB_xyz flags are what we then use in sb->s_flags.

The script to do this was:

    # places to look in; re security/*: it generally should *not* be
    # touched (that stuff parses mount(2) arguments directly), but
    # there are two places where we really deal with superblock flags.
    FILES="drivers/mtd drivers/staging/lustre fs ipc mm \
            include/linux/fs.h include/uapi/linux/bfs_fs.h \
            security/apparmor/apparmorfs.c security/apparmor/include/lib.h"
    # the list of MS_... constants
    SYMS="RDONLY NOSUID NODEV NOEXEC SYNCHRONOUS REMOUNT MANDLOCK \
          DIRSYNC NOATIME NODIRATIME BIND MOVE REC VERBOSE SILENT \
          POSIXACL UNBINDABLE PRIVATE SLAVE SHARED RELATIME KERNMOUNT \
          I_VERSION STRICTATIME LAZYTIME SUBMOUNT NOREMOTELOCK NOSEC BORN \
          ACTIVE NOUSER"

    SED_PROG=
    for i in $SYMS; do SED_PROG="$SED_PROG -e s/MS_$i/SB_$i/g"; done

    # we want files that contain at least one of MS_...,
    # with fs/namespace.c and fs/pnode.c excluded.
    L=$(for i in $SYMS; do git grep -w -l MS_$i $FILES; done| sort|uniq|grep -v '^fs/namespace.c'|grep -v '^fs/pnode.c')

    for f in $L; do sed -i $f $SED_PROG; done

Requested-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2017-11-27 13:05:09 -08:00
Andreas Gruenbacher 9aa0159327 gfs2: Remove unused gfs2_write_jdata_pagevec parameter
As a follow-up to commit d2bc5b3c67, remove the end parameter which is
now unused.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
2017-11-27 10:54:55 -06:00