Commit Graph

1899 Commits

Author SHA1 Message Date
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
Mel Gorman
8667982014 mm, pagevec: remove cold parameter for pagevecs
Every pagevec_init user claims the pages being released are hot even in
cases where it is unlikely the pages are hot.  As no one cares about the
hotness of pages being released to the allocator, just ditch the
parameter.

No performance impact is expected as the overhead is marginal.  The
parameter is removed simply because it is a bit stupid to have a useless
parameter copied everywhere.

Link: http://lkml.kernel.org/r/20171018075952.10627-6-mgorman@techsingularity.net
Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2017-11-15 18:21:06 -08:00
Jan Kara
67fd707f46 mm: remove nr_pages argument from pagevec_lookup_{,range}_tag()
All users of pagevec_lookup() and pagevec_lookup_range() now pass
PAGEVEC_SIZE as a desired number of pages.  Just drop the argument.

Link: http://lkml.kernel.org/r/20171009151359.31984-15-jack@suse.cz
Signed-off-by: Jan Kara <jack@suse.cz>
Reviewed-by: Daniel Jordan <daniel.m.jordan@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2017-11-15 18:21:04 -08:00
Jan Kara
d2bc5b3c67 gfs2: use pagevec_lookup_range_tag()
We want only pages from given range in gfs2_write_cache_jdata().  Use
pagevec_lookup_range_tag() instead of pagevec_lookup_tag() and remove
unnecessary code.

Link: http://lkml.kernel.org/r/20171009151359.31984-9-jack@suse.cz
Signed-off-by: Jan Kara <jack@suse.cz>
Reviewed-by: Daniel Jordan <daniel.m.jordan@oracle.com>
Cc: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2017-11-15 18:21:04 -08:00
Linus Torvalds
29309a4eb8 We've got a total of 17 GFS2 patches for this merge window. The
patches are basically in three categories: (1) patches related to
 broken xfstest cases, (2) patches related to improving iomap and
 start using it in GFS2, and (3) general typos and clarifications.
 
 Please note that one of the iomap patches extends beyond GFS2 and
 affects other file systems, but it was publically reviewed by a
 variety of file system people in the community.
 
 1. Andreas has a patch that simply renames variable 'bsize' to 'factor'
    to clarify the logic related to gfs2_block_map.
 2. He also has a patch to correctly set ctime in the setflags ioctl,
    which fixes broken xfstests test 277.
 3. He also fixed broken xfstest 258, due to an atime initialization
    problem.
 4. He also fixed broken xfstest 307, in which GFS2 was not setting
    ctime when setting acls.
 5. He has a patch to switch general iomap code from blkno to disk
    offset for a variety of file systems.
 6. He has a patch to add a new IOMAP_F_DATA_INLINE flag for iomap
    to indicate blocks that have data mixed with metadata.
 7. I contributed a patch to make inode height info part of the
    'metapath' data structure to facilitate using iomap in GFS2.
 8. I have a patch to start using iomap inside GFS2 and switch GFS2's
    block_map functions to use iomap under the covers.
 9. I have a patch to switch GFS2's fiemap implementation from using
    block_map to using iomap under the covers.
 10. Andreas has a patch to implement SEEK_HOLE and SEEK_DATA via
     iomap in GFS2.
 11. I have a patch related to journaled data pages not being properly
     synced to media when writing inodes. This was caught with xfstests.
 12. I have a patch to fix another failing xfstest case in which
     switching a file from ordered_write to journaled data via set_flags
     caused a deadlock.
 13. Andreas has a patch to fix failing xfstest case 066, which was
     due to not properly syncing dirty inodes when changing extended
     attributes.
 14. Andreas fixed a minor typo in a comment.
 15. Andreas contributed a patch to partially fix xfstest 424, which
     involved GET_FLAGS and SET_FLAGS ioctl. This is also a cleanup
     and simplification of the translation of flags from fs flags to
     gfs2 flags.
 16. He also added support for STATX_ATTR_ in statx, which fixed broken
     xfstest 424.
 17. He also contributed a fix for failing xfstest 093 which fixes a
     recursive glock problem with gfs2_xattr_get and _set.
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Merge tag 'gfs2-4.15.fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux-gfs2

Pull gfs2 updates from Bob Peterson:
 "We've got a total of 17 GFS2 patches for this merge window. The
  patches are basically in three categories: (1) patches related to
  broken xfstest cases, (2) patches related to improving iomap and start
  using it in GFS2, and (3) general typos and clarifications.

  Please note that one of the iomap patches extends beyond GFS2 and
  affects other file systems, but it was publically reviewed by a
  variety of file system people in the community.

  From Andreas Gruenbacher:

   - rename variable 'bsize' to 'factor' to clarify the logic related to
     gfs2_block_map.

   - correctly set ctime in the setflags ioctl, which fixes broken
     xfstests test 277.

   - fix broken xfstest 258, due to an atime initialization problem.

   - fix broken xfstest 307, in which GFS2 was not setting ctime when
     setting acls.

   - switch general iomap code from blkno to disk offset for a variety
     of file systems.

   - add a new IOMAP_F_DATA_INLINE flag for iomap to indicate blocks
     that have data mixed with metadata.

   - implement SEEK_HOLE and SEEK_DATA via iomap in GFS2.

   - fix failing xfstest case 066, which was due to not properly syncing
     dirty inodes when changing extended attributes.

   - fix a minor typo in a comment.

   - partially fix xfstest 424, which involved GET_FLAGS and SET_FLAGS
     ioctl. This is also a cleanup and simplification of the translation
     of flags from fs flags to gfs2 flags.

   - add support for STATX_ATTR_ in statx, which fixed broken xfstest
     424.

   - fix for failing xfstest 093 which fixes a recursive glock problem
     with gfs2_xattr_get and _set

  From me:

   - make inode height info part of the 'metapath' data structure to
     facilitate using iomap in GFS2.

   - start using iomap inside GFS2 and switch GFS2's block_map functions
     to use iomap under the covers.

   - switch GFS2's fiemap implementation from using block_map to using
     iomap under the covers.

   - fix journaled data pages not being properly synced to media when
     writing inodes. This was caught with xfstests.

   - fix another failing xfstest case in which switching a file from
     ordered_write to journaled data via set_flags caused a deadlock"

* tag 'gfs2-4.15.fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux-gfs2:
  gfs2: Allow gfs2_xattr_set to be called with the glock held
  gfs2: Add support for statx inode flags
  gfs2: Fix and clean up {GET,SET}FLAGS ioctl
  gfs2: Fix a harmless typo
  gfs2: Fix xattr fsync
  GFS2: Take inode off order_write list when setting jdata flag
  GFS2: flush the log and all pages for jdata as we do for WB_SYNC_ALL
  gfs2: Implement SEEK_HOLE / SEEK_DATA via iomap
  GFS2: Switch fiemap implementation to use iomap
  GFS2: Implement iomap for block_map
  GFS2: Make height info part of metapath
  gfs2: Always update inode ctime in set_acl
  gfs2: Support negative atimes
  gfs2: Update ctime in setflags ioctl
  gfs2: Clarify gfs2_block_map
2017-11-14 13:55:51 -08:00
Greg Kroah-Hartman
b24413180f License cleanup: add SPDX GPL-2.0 license identifier to files with no license
Many source files in the tree are missing licensing information, which
makes it harder for compliance tools to determine the correct license.

By default all files without license information are under the default
license of the kernel, which is GPL version 2.

Update the files which contain no license information with the 'GPL-2.0'
SPDX license identifier.  The SPDX identifier is a legally binding
shorthand, which can be used instead of the full boiler plate text.

This patch is based on work done by Thomas Gleixner and Kate Stewart and
Philippe Ombredanne.

How this work was done:

Patches were generated and checked against linux-4.14-rc6 for a subset of
the use cases:
 - file had no licensing information it it.
 - file was a */uapi/* one with no licensing information in it,
 - file was a */uapi/* one with existing licensing information,

Further patches will be generated in subsequent months to fix up cases
where non-standard license headers were used, and references to license
had to be inferred by heuristics based on keywords.

The analysis to determine which SPDX License Identifier to be applied to
a file was done in a spreadsheet of side by side results from of the
output of two independent scanners (ScanCode & Windriver) producing SPDX
tag:value files created by Philippe Ombredanne.  Philippe prepared the
base worksheet, and did an initial spot review of a few 1000 files.

The 4.13 kernel was the starting point of the analysis with 60,537 files
assessed.  Kate Stewart did a file by file comparison of the scanner
results in the spreadsheet to determine which SPDX license identifier(s)
to be applied to the file. She confirmed any determination that was not
immediately clear with lawyers working with the Linux Foundation.

Criteria used to select files for SPDX license identifier tagging was:
 - Files considered eligible had to be source code files.
 - Make and config files were included as candidates if they contained >5
   lines of source
 - File already had some variant of a license header in it (even if <5
   lines).

All documentation files were explicitly excluded.

The following heuristics were used to determine which SPDX license
identifiers to apply.

 - when both scanners couldn't find any license traces, file was
   considered to have no license information in it, and the top level
   COPYING file license applied.

   For non */uapi/* files that summary was:

   SPDX license identifier                            # files
   ---------------------------------------------------|-------
   GPL-2.0                                              11139

   and resulted in the first patch in this series.

   If that file was a */uapi/* path one, it was "GPL-2.0 WITH
   Linux-syscall-note" otherwise it was "GPL-2.0".  Results of that was:

   SPDX license identifier                            # files
   ---------------------------------------------------|-------
   GPL-2.0 WITH Linux-syscall-note                        930

   and resulted in the second patch in this series.

 - if a file had some form of licensing information in it, and was one
   of the */uapi/* ones, it was denoted with the Linux-syscall-note if
   any GPL family license was found in the file or had no licensing in
   it (per prior point).  Results summary:

   SPDX license identifier                            # files
   ---------------------------------------------------|------
   GPL-2.0 WITH Linux-syscall-note                       270
   GPL-2.0+ WITH Linux-syscall-note                      169
   ((GPL-2.0 WITH Linux-syscall-note) OR BSD-2-Clause)    21
   ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause)    17
   LGPL-2.1+ WITH Linux-syscall-note                      15
   GPL-1.0+ WITH Linux-syscall-note                       14
   ((GPL-2.0+ WITH Linux-syscall-note) OR BSD-3-Clause)    5
   LGPL-2.0+ WITH Linux-syscall-note                       4
   LGPL-2.1 WITH Linux-syscall-note                        3
   ((GPL-2.0 WITH Linux-syscall-note) OR MIT)              3
   ((GPL-2.0 WITH Linux-syscall-note) AND MIT)             1

   and that resulted in the third patch in this series.

 - when the two scanners agreed on the detected license(s), that became
   the concluded license(s).

 - when there was disagreement between the two scanners (one detected a
   license but the other didn't, or they both detected different
   licenses) a manual inspection of the file occurred.

 - In most cases a manual inspection of the information in the file
   resulted in a clear resolution of the license that should apply (and
   which scanner probably needed to revisit its heuristics).

 - When it was not immediately clear, the license identifier was
   confirmed with lawyers working with the Linux Foundation.

 - If there was any question as to the appropriate license identifier,
   the file was flagged for further research and to be revisited later
   in time.

In total, over 70 hours of logged manual review was done on the
spreadsheet to determine the SPDX license identifiers to apply to the
source files by Kate, Philippe, Thomas and, in some cases, confirmation
by lawyers working with the Linux Foundation.

Kate also obtained a third independent scan of the 4.13 code base from
FOSSology, and compared selected files where the other two scanners
disagreed against that SPDX file, to see if there was new insights.  The
Windriver scanner is based on an older version of FOSSology in part, so
they are related.

Thomas did random spot checks in about 500 files from the spreadsheets
for the uapi headers and agreed with SPDX license identifier in the
files he inspected. For the non-uapi files Thomas did random spot checks
in about 15000 files.

In initial set of patches against 4.14-rc6, 3 files were found to have
copy/paste license identifier errors, and have been fixed to reflect the
correct identifier.

Additionally Philippe spent 10 hours this week doing a detailed manual
inspection and review of the 12,461 patched files from the initial patch
version early this week with:
 - a full scancode scan run, collecting the matched texts, detected
   license ids and scores
 - reviewing anything where there was a license detected (about 500+
   files) to ensure that the applied SPDX license was correct
 - reviewing anything where there was no detection but the patch license
   was not GPL-2.0 WITH Linux-syscall-note to ensure that the applied
   SPDX license was correct

This produced a worksheet with 20 files needing minor correction.  This
worksheet was then exported into 3 different .csv files for the
different types of files to be modified.

These .csv files were then reviewed by Greg.  Thomas wrote a script to
parse the csv files and add the proper SPDX tag to the file, in the
format that the file expected.  This script was further refined by Greg
based on the output to detect more types of files automatically and to
distinguish between header and source .c files (which need different
comment types.)  Finally Greg ran the script using the .csv files to
generate the patches.

Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Reviewed-by: Philippe Ombredanne <pombredanne@nexb.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-11-02 11:10:55 +01:00
Andreas Gruenbacher
d0920a9cd7 gfs2: Allow gfs2_xattr_set to be called with the glock held
On the following call path:

  gfs2_setattr -> setattr_prepare -> ... ->
    cap_inode_killpriv -> ... ->
      gfs2_xattr_set

the glock is locked in gfs2_setattr, so check for recursive locking in
gfs2_xattr_set as gfs2_xattr_get already does.  While at it, get rid of
need_unlock in gfs2_xattr_get.

Fixes xfstest generic/093.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Acked-by: Abhijith Das <adas@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
2017-10-31 14:26:59 +01:00
Andreas Gruenbacher
b2623c2fe6 gfs2: Add support for statx inode flags
Add support for the STATX_ATTR_ flags in statx.  (Compression,
encryption, and the nodump flag are not supported by gfs2.)

Partially fixes xfstest generic/424.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Reviewed-by: Andrew Price <anprice@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
2017-10-31 14:26:58 +01:00
Andreas Gruenbacher
b16f7e57b7 gfs2: Fix and clean up {GET,SET}FLAGS ioctl
Switch to a simple array for mapping between the FS_*_FL and GFS_DIF_*
flags.  Clarify how the mapping between FS_JOURNAL_DATA_FL and the
filesystem flags works.  The GFS2_DIF_SYSTEM flag cannot be set from
user space, so remove it from GFS2_FLAGS_USER_SET.  Fail with -EINVAL
when trying to set flags that are not supported instead of silently
ignoring those flags.

Partially fixes xfstest generic/424.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Reviewed-by: Andrew Price <anprice@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
2017-10-31 14:26:57 +01:00
Andreas Gruenbacher
61d6899ad4 gfs2: Fix a harmless typo
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
2017-10-31 14:26:56 +01:00
Andreas Gruenbacher
6862c44ec5 gfs2: Fix xattr fsync
Make sure that changing xattrs marks the corresponding inode dirty so
that a subsequent fsync will sync those changes to disk.  We set
I_DIRTY_SYNC as well as I_DIRTY_DATASYNC so that both fsync and
fdatasync will sync xattr changes: xattrs can contain information
critical to how the data can be accessed, so we don't want fdatasync
to skip them.

Fixes xfstest generic/066.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Reviewed-by: Andrew Price <anprice@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
2017-10-31 14:26:56 +01:00
Bob Peterson
cc555b09d8 GFS2: Take inode off order_write list when setting jdata flag
This patch fixes a deadlock caused when the jdata flag is set for
inodes that are already on the ordered write list. Since it is
on the ordered write list, log_flush calls gfs2_ordered_write which
calls filemap_fdatawrite. But since the inode had the jdata flag
set, that calls gfs2_jdata_writepages, which tries to start a new
transaction. A new transaction cannot be started because it tries
to acquire the log_flush rwsem which is already locked by the log
flush operation.

The bottom line is: We cannot switch an inode from ordered to jdata
until we eliminate any ordered data pages (via log flush) or any
log_flush operation afterward will create the circular dependency
above. So we need to flush the log before setting the diskflags to
switch the file mode, then we need to remove the inode from the
ordered writes list.

Before this patch, the log flush was done for jdata->ordered, but
that's wrong. If we're going from jdata to ordered, we don't need
to call gfs2_log_flush because the call to filemap_fdatawrite will
do it for us:

   filemap_fdatawrite() -> __filemap_fdatawrite_range()
      __filemap_fdatawrite_range() -> do_writepages()
         do_writepages() -> gfs2_jdata_writepages()
            gfs2_jdata_writepages() -> gfs2_log_flush()

This patch modifies function do_gfs2_set_flags so that if a file
has its jdata flag set, and it's already on the ordered write list,
the log will be flushed and it will be removed from the list
before setting the flag.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Acked-by: Abhijith Das <adas@redhat.com>
2017-10-31 14:26:47 +01:00
Bob Peterson
adbc3ddf28 GFS2: flush the log and all pages for jdata as we do for WB_SYNC_ALL
In function gfs2_write_inode, starting with patch a9185b41a4, we
only flush the log and call filemap_fdatawait if we're passed in a
wbc sync_mode of WB_SYNC_ALL. We also need to do these things if
we're evicting a jdata inode, because we might have jdata pages
still attached to bufdata descriptors that need to be revoked, but
by the time it gets to evict() it's too late to start a new
transaction. This patch changes it to treat jdata inodes as if
WB_SYNC_ALL had been specified.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Acked-by: Abhijith Das <adas@redhat.com>
2017-10-31 14:26:35 +01:00
Andreas Gruenbacher
3a27411cb4 gfs2: Implement SEEK_HOLE / SEEK_DATA via iomap
So far, lseek on gfs2 did not report holes.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
2017-10-31 14:26:35 +01:00
Bob Peterson
aac1a55b45 GFS2: Switch fiemap implementation to use iomap
This patch switches GFS2's implementation of fiemap from the old
block_map code to the new iomap interface.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
2017-10-31 14:26:34 +01:00
Bob Peterson
3974320ca6 GFS2: Implement iomap for block_map
This patch implements iomap for block mapping, and switches the
block_map function to use it under the covers.

The additional IOMAP_F_BOUNDARY iomap flag indicates when iomap has
reached a "metadata boundary" and fetching the next mapping is likely to
incur an additional I/O.  This flag is used for setting the bh buffer
boundary flag.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
2017-10-31 14:26:33 +01:00
Bob Peterson
5f8bd4440d GFS2: Make height info part of metapath
This patch eliminates height parameters from function gfs2_bmap_alloc.
Function find_metapath determines the metapath's "find height", also
known as the desired height. Function lookup_metapath determines the
metapath's "actual height", previously known as starting height or
sheight. Function gfs2_bmap_alloc now gets both height values from
the metapath. This simplification was done as a step toward switching
the block_map functions to using iomap. The bh_map responsibilities
are also removed from function gfs2_bmap_alloc for the same reason.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
2017-10-31 14:26:23 +01:00
Andreas Gruenbacher
0c9a66ec0e Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4 2017-10-16 15:06:23 +02:00
Linus Torvalds
17763641ff GFS2: Fix an old regression in GFS2's debugfs interface
This tag is meant for pulling a patch called "gfs2: Fix
 debugfs glocks dump" which fixes a regression introduced
 by commit 88ffbf3e03. The regression caused the glock
 dump in debugfs to not report all the glocks, which makes
 debugging extremely difficult.
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Merge tag 'gfs2-for-linus-4.14-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux-gfs2

Pull gfs2 fix from Bob Peterson:
 "GFS2: Fix an old regression in GFS2's debugfs interface

 This fixes a regression introduced by commit 88ffbf3e03 ("GFS2: Use
 resizable hash table for glocks"). The regression caused the glock dump
 in debugfs to not report all the glocks, which makes debugging
 extremely difficult"

* tag 'gfs2-for-linus-4.14-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux-gfs2:
  gfs2: Fix debugfs glocks dump
2017-09-25 15:41:56 -07:00
Andreas Gruenbacher
c2c4be28c2 gfs2: Always update inode ctime in set_acl
Three-entry POSIX ACLs can be stored in the file mode permission bits,
with no need to store them in extended attributes.  When a process sets
such a minimal ACL, the kernel updates the file mode like chmod does,
and removes any existing extended attributes for that ACL.  Make sure
the ctime is always updated in that case.

Fixes xfstest generic/307.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
2017-09-25 12:33:19 -05:00
Andreas Gruenbacher
38eedf2841 gfs2: Support negative atimes
When inodes are read from disk, GFS2 will only update in-memory atimes
older than the on-disk atimes; this prevents atimes from going
backwards.  The atimes of newly allocated inodes are initialized to 0.
This means that when an atime is explicitly set to a negative value,
this value will not persist.

Fix by setting the atime of newly allocated inodes to the lowest
possible value instead of 0.

Fixes xfstest generic/258.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
2017-09-25 12:33:19 -05:00
Andreas Gruenbacher
9b7c2ddb45 gfs2: Update ctime in setflags ioctl
The FS_IOC_SETFLAGS ioctl is supposed to update the inode ctime.
Fixes xfstests generic/277.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
2017-09-25 12:33:18 -05:00
Andreas Gruenbacher
20cdc1931e gfs2: Clarify gfs2_block_map
Add a comment about the logical block size for directories.  Rename
"bsize" in gfs2_block_map to "factor".  Fix a typo in the description of
metaptr1.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
2017-09-25 12:33:18 -05:00
Andreas Gruenbacher
10201655b0 gfs2: Fix debugfs glocks dump
The switch to rhashtables (commit 88ffbf3e03) broke the debugfs glock
dump (/sys/kernel/debug/gfs2/<device>/glocks) for dumps bigger than a
single buffer: the right function for restarting an rhashtable iteration
from the beginning of the hash table is rhashtable_walk_enter;
rhashtable_walk_stop + rhashtable_walk_start will just resume from the
current position.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Cc: stable@vger.kernel.org # v4.3+
2017-09-25 12:32:33 -05:00
Linus Torvalds
0f0d12728e Merge branch 'work.mount' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Pull mount flag updates from Al Viro:
 "Another chunk of fmount preparations from dhowells; only trivial
  conflicts for that part. It separates MS_... bits (very grotty
  mount(2) ABI) from the struct super_block ->s_flags (kernel-internal,
  only a small subset of MS_... stuff).

  This does *not* convert the filesystems to new constants; only the
  infrastructure is done here. The next step in that series is where the
  conflicts would be; that's the conversion of filesystems. It's purely
  mechanical and it's better done after the merge, so if you could run
  something like

	list=$(for i in MS_RDONLY MS_NOSUID MS_NODEV MS_NOEXEC MS_SYNCHRONOUS MS_MANDLOCK MS_DIRSYNC MS_NOATIME MS_NODIRATIME MS_SILENT MS_POSIXACL MS_KERNMOUNT MS_I_VERSION MS_LAZYTIME; do git grep -l $i fs drivers/staging/lustre drivers/mtd ipc mm include/linux; done|sort|uniq|grep -v '^fs/namespace.c$')

	sed -i -e 's/\<MS_RDONLY\>/SB_RDONLY/g' \
	        -e 's/\<MS_NOSUID\>/SB_NOSUID/g' \
	        -e 's/\<MS_NODEV\>/SB_NODEV/g' \
	        -e 's/\<MS_NOEXEC\>/SB_NOEXEC/g' \
	        -e 's/\<MS_SYNCHRONOUS\>/SB_SYNCHRONOUS/g' \
	        -e 's/\<MS_MANDLOCK\>/SB_MANDLOCK/g' \
	        -e 's/\<MS_DIRSYNC\>/SB_DIRSYNC/g' \
	        -e 's/\<MS_NOATIME\>/SB_NOATIME/g' \
	        -e 's/\<MS_NODIRATIME\>/SB_NODIRATIME/g' \
	        -e 's/\<MS_SILENT\>/SB_SILENT/g' \
	        -e 's/\<MS_POSIXACL\>/SB_POSIXACL/g' \
	        -e 's/\<MS_KERNMOUNT\>/SB_KERNMOUNT/g' \
	        -e 's/\<MS_I_VERSION\>/SB_I_VERSION/g' \
	        -e 's/\<MS_LAZYTIME\>/SB_LAZYTIME/g' \
	        $list

  and commit it with something along the lines of 'convert filesystems
  away from use of MS_... constants' as commit message, it would save a
  quite a bit of headache next cycle"

* 'work.mount' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  VFS: Differentiate mount flags (MS_*) from internal superblock flags
  VFS: Convert sb->s_flags & MS_RDONLY to sb_rdonly(sb)
  vfs: Add sb_rdonly(sb) to query the MS_RDONLY flag on s_flags
2017-09-14 18:54:01 -07:00
Linus Torvalds
a0725ab0c7 Merge branch 'for-4.14/block' of git://git.kernel.dk/linux-block
Pull block layer updates from Jens Axboe:
 "This is the first pull request for 4.14, containing most of the code
  changes. It's a quiet series this round, which I think we needed after
  the churn of the last few series. This contains:

   - Fix for a registration race in loop, from Anton Volkov.

   - Overflow complaint fix from Arnd for DAC960.

   - Series of drbd changes from the usual suspects.

   - Conversion of the stec/skd driver to blk-mq. From Bart.

   - A few BFQ improvements/fixes from Paolo.

   - CFQ improvement from Ritesh, allowing idling for group idle.

   - A few fixes found by Dan's smatch, courtesy of Dan.

   - A warning fixup for a race between changing the IO scheduler and
     device remova. From David Jeffery.

   - A few nbd fixes from Josef.

   - Support for cgroup info in blktrace, from Shaohua.

   - Also from Shaohua, new features in the null_blk driver to allow it
     to actually hold data, among other things.

   - Various corner cases and error handling fixes from Weiping Zhang.

   - Improvements to the IO stats tracking for blk-mq from me. Can
     drastically improve performance for fast devices and/or big
     machines.

   - Series from Christoph removing bi_bdev as being needed for IO
     submission, in preparation for nvme multipathing code.

   - Series from Bart, including various cleanups and fixes for switch
     fall through case complaints"

* 'for-4.14/block' of git://git.kernel.dk/linux-block: (162 commits)
  kernfs: checking for IS_ERR() instead of NULL
  drbd: remove BIOSET_NEED_RESCUER flag from drbd_{md_,}io_bio_set
  drbd: Fix allyesconfig build, fix recent commit
  drbd: switch from kmalloc() to kmalloc_array()
  drbd: abort drbd_start_resync if there is no connection
  drbd: move global variables to drbd namespace and make some static
  drbd: rename "usermode_helper" to "drbd_usermode_helper"
  drbd: fix race between handshake and admin disconnect/down
  drbd: fix potential deadlock when trying to detach during handshake
  drbd: A single dot should be put into a sequence.
  drbd: fix rmmod cleanup, remove _all_ debugfs entries
  drbd: Use setup_timer() instead of init_timer() to simplify the code.
  drbd: fix potential get_ldev/put_ldev refcount imbalance during attach
  drbd: new disk-option disable-write-same
  drbd: Fix resource role for newly created resources in events2
  drbd: mark symbols static where possible
  drbd: Send P_NEG_ACK upon write error in protocol != C
  drbd: add explicit plugging when submitting batches
  drbd: change list_for_each_safe to while(list_first_entry_or_null)
  drbd: introduce drbd_recv_header_maybe_unplug
  ...
2017-09-07 11:59:42 -07:00
Linus Torvalds
ec3604c7a5 Writeback error handling fixes for v4.14
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Merge tag 'wberr-v4.14-1' of git://git.kernel.org/pub/scm/linux/kernel/git/jlayton/linux

Pull writeback error handling updates from Jeff Layton:
 "This pile continues the work from last cycle on better tracking
  writeback errors. In v4.13 we added some basic errseq_t infrastructure
  and converted a few filesystems to use it.

  This set continues refining that infrastructure, adds documentation,
  and converts most of the other filesystems to use it. The main
  exception at this point is the NFS client"

* tag 'wberr-v4.14-1' of git://git.kernel.org/pub/scm/linux/kernel/git/jlayton/linux:
  ecryptfs: convert to file_write_and_wait in ->fsync
  mm: remove optimizations based on i_size in mapping writeback waits
  fs: convert a pile of fsync routines to errseq_t based reporting
  gfs2: convert to errseq_t based writeback error reporting for fsync
  fs: convert sync_file_range to use errseq_t based error-tracking
  mm: add file_fdatawait_range and file_write_and_wait
  fuse: convert to errseq_t based error tracking for fsync
  mm: consolidate dax / non-dax checks for writeback
  Documentation: add some docs for errseq_t
  errseq: rename __errseq_set to errseq_set
2017-09-06 14:11:03 -07:00
Linus Torvalds
77d0ab600a We've got a whopping 29 GFS2 patches for this merge window, mainly
because we held some back from the previous merge window until we
 could get them perfected and well tested. We have a couple patch
 sets, including my patch set for protecting glock gl_object and
 Andreas Gruenbacher's patch set to fix the long-standing shrink-
 slab hang, plus a bunch of assorted bugs and cleanups:
 
 1. I fixed a bug whereby an IO error would lead to a double-brelse.
 2. Andreas Gruenbacher made a minor cleanup to call his relatively
    new function, gfs2_holder_initialized, rather than doing it
    manually. This was just missed by a previous patch set.
 3. Jan Kara fixed a bug whereby the SGID was being cleared when
    inheriting ACLs.
 4. Andreas found a bug and fixed it in his previous patch,
    "Get rid of flush_delayed_work in gfs2_evict_inode". A call to
    flush_delayed_work was deleted from *gfs2_inode_lookup and added
    to gfs2_create_inode.
 5. Wang Xibo found and fixed a list_add call in inode_go_lock
    that specified the parameters in the wrong order.
 6. Coly Li submitted a patch to add the REQ_PRIO to some of GFS2's
    metadata reads that were accidentally missing them.
 7 - 10. I submitted a 4-patch set to protect the glock gl_object
    field. GFS2 was setting and checking gl_object with no locking
    mechanism, so the value was occasionally stomped on, which caused
    file system corruption.
 11. I submitted a small cleanup to function gfs2_clear_rgrpd.
    It was needlessly adding rgrp glocks to the lru list, then pulling
    them back off immediately. The rgrp glocks don't use the lru list
    anyway, so doing so was just a waste of time.
 12. I submitted a patch that checks the GLOF_LRU flag on a glock
    before trying to remove it from the lru_list. This avoids a lot
    of unnecessary spin_lock contention.
 13. I submitted a patch to delete GFS2's debugfs files only after
    we evict all the glocks. Before this patch, GFS2 would delete the
    debugfs files, and if unmount hung waiting for a glock, there was
    no way to debug the problem. Now, if a hang occurs during umount,
    we can examine the debugfs files to figure out why it's hung.
 14. Andreas Gruenbacher submitted a patch to fix some trivial typos.
 15 - 19. Andreas also submitted a five-part patch set to fix the
    longstanding hang involving the slab shrinker: dlm requires
    memory, calls the inode shrinker, which calls gfs2's evict, which
    calls back into DLM before it can evict an inode.
 20. Abhi Das submitted a patch to forcibly flush the active items
    list to relieve memory pressure. This fixes a long-standing bug
    whereby GFS2 was getting hung permanently in balance_dirty_pages.
 21. Thomas Tai submitted a patch to fix a slab corruption problem
    due to a residual pointer left in the lock_dlm lockstruct.
 22. I submitted a patch to withdraw the file system if IO errors
    are encountered while writing to the journals or statfs system
    file which were previously not being sent back up. Before, some
    IO errors were sometimes not be detected for several hours, and
    at recovery time, the journal errors made journal replay
    impossible.
 23. Andreas has a patch to fix an annoying format-truncation compiler
    warning so GFS2 compiles cleanly.
 24. I have a patch that fixes a handful of sparse compiler warnings.
 25. Andreas fixed up an useless gl_object warning caused by an
    earlier patch.
 26. Arvind Yadav added a patch to properly constify our rhashtable
    params declare.
 27. I added a patch to fix a regression caused by the non-recursive
    delete and truncate patch that caused file system blocks to not
    be properly freed.
 28. Ernesto A. Fernández added a patch to fix a place where GFS2
    would send back the wrong return code setting extended attributes.
 29. Ernesto also added a patch to fix a case in which GFS2 was
    improperly setting an inode's i_mode, potentially granting access
    to the wrong users.
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Merge tag 'gfs2-4.14.fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux-gfs2

Pull GFS2 updates from Bob Peterson:
 "We've got a whopping 29 GFS2 patches for this merge window, mainly
  because we held some back from the previous merge window until we
  could get them perfected and well tested. We have a couple patch sets,
  including my patch set for protecting glock gl_object and Andreas
  Gruenbacher's patch set to fix the long-standing shrink- slab hang,
  plus a bunch of assorted bugs and cleanups.

  Summary:

   - I fixed a bug whereby an IO error would lead to a double-brelse.

   - Andreas Gruenbacher made a minor cleanup to call his relatively new
     function, gfs2_holder_initialized, rather than doing it manually.
     This was just missed by a previous patch set.

   - Jan Kara fixed a bug whereby the SGID was being cleared when
     inheriting ACLs.

   - Andreas found a bug and fixed it in his previous patch, "Get rid of
     flush_delayed_work in gfs2_evict_inode". A call to
     flush_delayed_work was deleted from *gfs2_inode_lookup and added to
     gfs2_create_inode.

   - Wang Xibo found and fixed a list_add call in inode_go_lock that
     specified the parameters in the wrong order.

   - Coly Li submitted a patch to add the REQ_PRIO to some of GFS2's
     metadata reads that were accidentally missing them.

   - I submitted a 4-patch set to protect the glock gl_object field.
     GFS2 was setting and checking gl_object with no locking mechanism,
     so the value was occasionally stomped on, which caused file system
     corruption.

   - I submitted a small cleanup to function gfs2_clear_rgrpd. It was
     needlessly adding rgrp glocks to the lru list, then pulling them
     back off immediately. The rgrp glocks don't use the lru list
     anyway, so doing so was just a waste of time.

   - I submitted a patch that checks the GLOF_LRU flag on a glock before
     trying to remove it from the lru_list. This avoids a lot of
     unnecessary spin_lock contention.

   - I submitted a patch to delete GFS2's debugfs files only after we
     evict all the glocks. Before this patch, GFS2 would delete the
     debugfs files, and if unmount hung waiting for a glock, there was
     no way to debug the problem. Now, if a hang occurs during umount,
     we can examine the debugfs files to figure out why it's hung.

   - Andreas Gruenbacher submitted a patch to fix some trivial typos.

   - Andreas also submitted a five-part patch set to fix the
     longstanding hang involving the slab shrinker: dlm requires memory,
     calls the inode shrinker, which calls gfs2's evict, which calls
     back into DLM before it can evict an inode.

   - Abhi Das submitted a patch to forcibly flush the active items list
     to relieve memory pressure. This fixes a long-standing bug whereby
     GFS2 was getting hung permanently in balance_dirty_pages.

   - Thomas Tai submitted a patch to fix a slab corruption problem due
     to a residual pointer left in the lock_dlm lockstruct.

   - I submitted a patch to withdraw the file system if IO errors are
     encountered while writing to the journals or statfs system file
     which were previously not being sent back up. Before, some IO
     errors were sometimes not be detected for several hours, and at
     recovery time, the journal errors made journal replay impossible.

   - Andreas has a patch to fix an annoying format-truncation compiler
     warning so GFS2 compiles cleanly.

   - I have a patch that fixes a handful of sparse compiler warnings.

   - Andreas fixed up an useless gl_object warning caused by an earlier
     patch.

   - Arvind Yadav added a patch to properly constify our rhashtable
     params declare.

   - I added a patch to fix a regression caused by the non-recursive
     delete and truncate patch that caused file system blocks to not be
     properly freed.

   - Ernesto A. Fernández added a patch to fix a place where GFS2 would
     send back the wrong return code setting extended attributes.

   - Ernesto also added a patch to fix a case in which GFS2 was
     improperly setting an inode's i_mode, potentially granting access
     to the wrong users"

* tag 'gfs2-4.14.fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux-gfs2: (29 commits)
  gfs2: preserve i_mode if __gfs2_set_acl() fails
  gfs2: don't return ENODATA in __gfs2_xattr_set unless replacing
  GFS2: Fix non-recursive truncate bug
  gfs2: constify rhashtable_params
  GFS2: Fix gl_object warnings
  GFS2: Fix up some sparse warnings
  gfs2: Silence gcc format-truncation warning
  GFS2: Withdraw for IO errors writing to the journal or statfs
  gfs2: fix slab corruption during mounting and umounting gfs file system
  gfs2: forcibly flush ail to relieve memory pressure
  gfs2: Clean up waiting on glocks
  gfs2: Defer deleting inodes under memory pressure
  gfs2: gfs2_evict_inode: Put glocks asynchronously
  gfs2: Get rid of gfs2_set_nlink
  gfs2: gfs2_glock_get: Wait on freeing glocks
  gfs2: Fix trivial typos
  GFS2: Delete debugfs files only after we evict the glocks
  GFS2: Don't waste time locking lru_lock for non-lru glocks
  GFS2: Don't bother trying to add rgrps to the lru list
  GFS2: Clear gl_object when deleting an inode in gfs2_delete_inode
  ...
2017-09-06 11:42:31 -07:00
Ernesto A. Fernández
309e8cda59 gfs2: preserve i_mode if __gfs2_set_acl() fails
When changing a file's acl mask, __gfs2_set_acl() will first set the
group bits of i_mode to the value of the mask, and only then set the
actual extended attribute representing the new acl.

If the second part fails (due to lack of space, for example) and the
file had no acl attribute to begin with, the system will from now on
assume that the mask permission bits are actual group permission bits,
potentially granting access to the wrong users.

Prevent this by only changing the inode mode after the acl has been set.

Signed-off-by: Ernesto A. Fernández <ernesto.mnd.fernandez@gmail.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
2017-08-31 07:53:15 -05:00
Ernesto A. Fernández
54aae14bee gfs2: don't return ENODATA in __gfs2_xattr_set unless replacing
The function __gfs2_xattr_set() will return -ENODATA when called to
remove a xattr that does not exist. The result is that setfacl will
show an exit status of 1 when called to set only a file's mode bits
(on a file with no ACLs), despite succeeding. A "No data available"
error will be printed as well.

To fix this return 0 instead, except when the XATTR_REPLACE flag is
set, in which case -ENODATA is appropriate. This is consistent with
how most other xattr setting functions work, in other filesystems.

Signed-off-by: Ernesto A. Fernández <ernesto.mnd.fernandez@gmail.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
2017-08-31 07:43:03 -05:00
Bob Peterson
c4a9d1892f GFS2: Fix non-recursive truncate bug
Before this patch if you truncated a file to a smaller size it
wasn't freeing all the blocks properly. There are two reasons.

First, the metapath comparison was not comparing previous heights.
I added a function, mp_eq_to_hgt, which checks the metapath at
all heights prior to the target height.

Second, in function find_nonnull_ptr, it needed to zero out all
pointers for heights following the target height. Translated into
decimal integer terms, this way a number like 299, when incremented,
becomes 300, not 399. The 2 gets incremented to 3, and the following
digits need to be reset.

These two things allow the truncate state machine to properly find
the blocks it needs to delete.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
2017-08-30 13:29:22 -05:00
Arvind Yadav
d296b15ed5 gfs2: constify rhashtable_params
rhashtable_params are not supposed to change at runtime. All
Functions rhashtable_* working with const rhashtable_params
provided by <linux/rhashtable.h>. So mark the non-const structs
as const.

Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
2017-08-30 08:14:39 -05:00
Andreas Gruenbacher
7023a0b16f GFS2: Fix gl_object warnings
The following cleanup is needed to avoid spilling the syslog with
false warnings.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
2017-08-30 08:14:27 -05:00
Bob Peterson
27c3b415f6 GFS2: Fix up some sparse warnings
This patch cleans up various pieces of GFS2 to avoid sparse errors.
This doesn't fix them all, but it fixes several. The first error,
in function glock_hash_walk was a genuine bug where the rhashtable
could be started and not stopped.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
2017-08-25 18:47:18 -05:00
Andreas Gruenbacher
561b796987 gfs2: Silence gcc format-truncation warning
Enlarge sd_fsname to be big enough for the longest long lock table name
and an arbitrary journal number.  This silences two -Wformat-truncation
warnings with gcc 7.1.1.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
2017-08-25 10:59:21 -05:00
Bob Peterson
942b0cddfb GFS2: Withdraw for IO errors writing to the journal or statfs
Before this patch, if GFS2 encountered IO errors while writing to
the journal, it would not report the problem, so they would go
unnoticed, sometimes for many hours. Sometimes this would only be
noticed later, when recovery tried to do journal replay and failed
due to invalid metadata at the blocks that resulted in IO errors.

This patch makes GFS2's log daemon check for IO errors. If it
encounters one, it withdraws from the file system and reports
why in dmesg. A similar action is taken when IO errors occur when
writing to the system statfs file.

These errors are also reported back to any callers of fsync, since
that requires the journal to be flushed. Therefore, any IO errors
that would previously go unnoticed are now noticed and the file
system is withdrawn as early as possible, thus preventing further
file system damage.

Also note that this reintroduces superblock variable sd_log_error,
which Christoph removed with commit f729b66fca.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
2017-08-25 10:59:09 -05:00
Christoph Hellwig
74d46992e0 block: replace bi_bdev with a gendisk pointer and partitions index
This way we don't need a block_device structure to submit I/O.  The
block_device has different life time rules from the gendisk and
request_queue and is usually only available when the block device node
is open.  Other callers need to explicitly create one (e.g. the lightnvm
passthrough code, or the new nvme multipathing code).

For the actual I/O path all that we need is the gendisk, which exists
once per block device.  But given that the block layer also does
partition remapping we additionally need a partition index, which is
used for said remapping in generic_make_request.

Note that all the block drivers generally want request_queue or
sometimes the gendisk, so this removes a layer of indirection all
over the stack.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2017-08-23 12:49:55 -06:00
Thomas Tai
cc1dfa8b75 gfs2: fix slab corruption during mounting and umounting gfs file system
When using cman-3.0.12.1 and gfs2-utils-3.0.12.1, mounting and
unmounting GFS2 file system would cause kernel to hang. The slab
allocator suggests that it is likely a double free memory corruption.
The issue is traced back to v3.9-rc6 where a patch is submitted to
use kzalloc() for storing a bitmap instead of using a local variable.
The intention is to allocate memory during mount and to free memory
during unmount. The original patch misses a code path which has
already freed the memory and caused memory corruption. This patch sets
the memory pointer to NULL after the memory is freed, so that double
free memory corruption will not happen.

gdlm_mount()
  '-- set_recover_size() which use kzalloc()
  '-- if dlm does not support ops callbacks then
          '--- free_recover_size() which use kfree()

gldm_unmount()
  '-- free_recover_size() which use kfree()

Previous patch which introduced the double free issue is
commit 57c7310b8e ("GFS2: use kmalloc for lvb bitmap")

Signed-off-by: Thomas Tai <thomas.tai@oracle.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Reviewed-by: Liam R. Howlett <Liam.Howlett@Oracle.com>
2017-08-15 11:54:09 -05:00
Abhi Das
b066a4eebd gfs2: forcibly flush ail to relieve memory pressure
On systems with low memory, it is possible for gfs2 to infinitely
loop in balance_dirty_pages() under heavy IO (creating sparse files).

balance_dirty_pages() attempts to write out the dirty pages via
gfs2_writepages() but none are found because these dirty pages are
being used by the journaling code in the ail. Normally, the journal
has an upper threshold which when hit triggers an automatic flush
of the ail. But this threshold can be higher than the number of
allowable dirty pages and result in the ail never being flushed.

This patch forces an ail flush when gfs2_writepages() fails to write
anything. This is a good indication that the ail might be holding
some dirty pages.

Signed-off-by: Abhi Das <adas@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
2017-08-10 10:51:03 -05:00
Andreas Gruenbacher
a91323e255 gfs2: Clean up waiting on glocks
The prepare_to_wait_on_glock and finish_wait_on_glock functions introduced in
commit 56a365be "gfs2: gfs2_glock_get: Wait on freeing glocks" are
better removed, resulting in cleaner code.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
2017-08-10 10:51:02 -05:00
Andreas Gruenbacher
6a1c8f6dcf gfs2: Defer deleting inodes under memory pressure
When under memory pressure and an inode's link count has dropped to
zero, defer deleting the inode to the delete workqueue.  This avoids
calling into DLM under memory pressure, which can deadlock.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
2017-08-10 10:49:13 -05:00
Andreas Gruenbacher
71c1b21368 gfs2: gfs2_evict_inode: Put glocks asynchronously
gfs2_evict_inode is called to free inodes under memory pressure.  The
function calls into DLM when an inode's last cluster-wide reference goes
away (remote unlink) and to release the glock and associated DLM lock
before finally destroying the inode.  However, if DLM is blocked on
memory to become available, calling into DLM again will deadlock.

Avoid that by decoupling releasing glocks from destroying inodes in that
case: with gfs2_glock_queue_put, glocks will be dequeued asynchronously
in work queue context, when the associated inodes have likely already
been destroyed.

With this change, inodes can end up being unlinked, remote-unlink can be
triggered, and then the inode can be reallocated before all
remote-unlink callbacks are processed.  To detect that, revalidate the
link count in gfs2_evict_inode to make sure we're not deleting an
allocated, referenced inode.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
2017-08-10 10:45:21 -05:00
Andreas Gruenbacher
eebd2e813f gfs2: Get rid of gfs2_set_nlink
Remove gfs2_set_nlink which prevents the link count of an inode from
becoming non-zero once it has reached zero.  The next commit reduces the
amount of waiting on glocks when an inode is evicted from memory.  With
that, an inode can become reallocated before all the remote-unlink
callbacks from a previous delete are processed, which causes the link
count to change from zero to non-zero.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
2017-08-10 10:42:11 -05:00
Andreas Gruenbacher
0515480ad4 gfs2: gfs2_glock_get: Wait on freeing glocks
Keep glocks in their hash table until they are freed instead of removing
them when their last reference is dropped.  This allows to wait for any
previous instances of a glock to go away in gfs2_glock_get before
creating a new glocks.

Special thanks to Andy Price for finding and fixing a problem which also
required us to delete the rcu_read_unlock from the error case in function
gfs2_glock_get.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
2017-08-10 10:39:31 -05:00
Andreas Gruenbacher
61b91cfdc6 gfs2: Fix trivial typos
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
2017-08-09 09:36:39 -05:00
Bob Peterson
b2fb7dab7f GFS2: Delete debugfs files only after we evict the glocks
This patch moves the call to gfs2_delete_debugfs_file so that it
comes after the glock hash table has been cleared. This way we
can query the debugfs files if umount hangs.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
2017-08-09 09:36:39 -05:00
Bob Peterson
645ebd49f0 GFS2: Don't waste time locking lru_lock for non-lru glocks
Before this patch, glock_dq would call gfs2_glock_remove_from_lru.
For glocks that are never put on the LRU, such as the transaction
glock, this just takes the spin_lock, determines there's nothing to
be done because the list is empty, then unlocks again. This was
causing unnecessary lock contention on the lru_lock spin_lock.
This patch adds a check for GLOF_LRU in the glops before taking
the spin_lock.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
2017-08-09 09:36:39 -05:00
Bob Peterson
2d821a8b71 GFS2: Don't bother trying to add rgrps to the lru list
This patch removes a call to gfs2_glock_add_to_lru from function
gfs2_clear_rgrpd. The call is just a waste of time because as soon
as it adds it to the lru_list, the call to gfs2_glock_put takes it
back off again.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
2017-08-09 09:36:38 -05:00
Bob Peterson
240c6235df GFS2: Clear gl_object when deleting an inode in gfs2_delete_inode
This patch adds some calls to clear gl_object in function
gfs2_delete_inode. Since we are deleting the inode, and the glock
typically outlives the inode in core, we must clear gl_object
so subsequent use of the glock (e.g. for a new inode in its place)
will not have the old pointer sitting there. In error cases we
need to tidy up after ourselves. In non-error cases, we need to
clear gl_object before we set the block free in the bitmap so
residules aren't left for potential inode creators.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Reviewed-by: Andreas Gruenbacher <agruenba@redhat.com>
2017-08-09 09:36:38 -05:00
Bob Peterson
9c1b28081f GFS2: Clear gl_object if gfs2_create_inode fails
If function gfs2_create_inode fails after the inode has been
created (for example, if the inode_refresh fails for some reason)
the function was setting gl_object but never clearing it again.
The glocks are left pointing to a freed inode. This patch adds
the calls to clear gl_object in the appropriate error paths.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Reviewed-by: Andreas Gruenbacher <agruenba@redhat.com>
2017-08-09 09:36:26 -05:00