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  1. 13 8月, 2013 22 次提交
  3. 31 7月, 2013 1 次提交
  5. 25 7月, 2013 1 次提交
    • D
      xfs: di_flushiter considered harmful · e60896d8
      由 Dave Chinner 提交于 
      When we made all inode updates transactional, we no longer needed
the log recovery detection for inodes being newer on disk than the
transaction being replayed - it was redundant as replay of the log
would always result in the latest version of the inode would be on
disk. It was redundant, but left in place because it wasn't
considered to be a problem.

However, with the new "don't read inodes on create" optimisation,
flushiter has come back to bite us. Essentially, the optimisation
made always initialises flushiter to zero in the create transaction,
and so if we then crash and run recovery and the inode already on
disk has a non-zero flushiter it will skip recovery of that inode.
As a result, log recovery does the wrong thing and we end up with a
corrupt filesystem.

Because we have to support old kernel to new kernel upgrades, we
can't just get rid of the flushiter support in log recovery as we
might be upgrading from a kernel that doesn't have fully transactional
inode updates.  Unfortunately, for v4 superblocks there is no way to
guarantee that log recovery knows about this fact.

We cannot add a new inode format flag to say it's a "special inode
create" because it won't be understood by older kernels and so
recovery could do the wrong thing on downgrade. We cannot specially
detect the combination of zero mode/non-zero flushiter on disk to
non-zero mode, zero flushiter in the log item during recovery
because wrapping of the flushiter can result in false detection.

Hence that makes this "don't use flushiter" optimisation limited to
a disk format that guarantees that we don't need it. And that means
the only fix here is to limit the "no read IO on create"
optimisation to version 5 superblocks....
Reported-by: NMarkus Trippelsdorf <markus@trippelsdorf.de>
Signed-off-by: NDave Chinner <dchinner@redhat.com>
Reviewed-by: NMark Tinguely <tinguely@sgi.com>
Signed-off-by: NBen Myers <bpm@sgi.com>
      e60896d8
  7. 23 7月, 2013 4 次提交
    • C
      xfs: Start using pquotaino from the superblock. · d892d586
      由 Chandra Seetharaman 提交于 
      Start using pquotino and define a macro to check if the
superblock has pquotino.

Keep backward compatibilty by alowing mount of older superblock
with no separate pquota inode.
Signed-off-by: NChandra Seetharaman <sekharan@us.ibm.com>
Reviewed-by: NBen Myers <bpm@sgi.com>
Signed-off-by: NBen Myers <bpm@sgi.com>
      d892d586
    • C
      xfs: Initialize all quota inodes to be NULLFSINO · 01026297
      由 Chandra Seetharaman 提交于 
      mkfs doesn't initialize the quota inodes to NULLFSINO as it does for the
other internal inodes. This leads to two in-core values (0 and NULLFSINO)
to be checked against, to make sure if a quota inode is valid.

Solve that problem by initializing the in-core values of all quotaino
values to NULLFSINO if they are 0 in the disk.

Note that these values are not written back to on-disk superblock unless
some quota is enabled on the filesystem. Even in that case sb_pquotino is
written to disk only if the on-disk superblock supports pquotino
Signed-off-by: NChandra Seetharaman <sekharan@us.ibm.com>
Reviewed-by: NBen Myers <bpm@sgi.com>
Signed-off-by: NBen Myers <bpm@sgi.com>
      01026297
    • C
      xfs: Fix a deadlock in xfs_log_commit_cil() code path · 297aa637
      由 Chandra Seetharaman 提交于 
      While testing and rearranging pquota/gquota code, I stumbled
on a xfs_shutdown() during a mount. But the mount just hung.

Debugged and found that there is a deadlock involving
&log->l_cilp->xc_ctx_lock.

It is in a code path where &log->l_cilp->xc_ctx_lock is first
acquired in read mode and some levels down the same semaphore
is being acquired in write mode causing a deadlock.

This is the stack:
xfs_log_commit_cil -> acquires &log->l_cilp->xc_ctx_lock in read mode
  xlog_print_tic_res
    xfs_force_shutdown
      xfs_log_force_umount
        xlog_cil_force
          xlog_cil_force_lsn
            xlog_cil_push_foreground
              xlog_cil_push - tries to acquire same semaphore in write mode

This patch fixes the deadlock by changing the reason code for
xfs_force_shutdown in xlog_print_tic_res() to SHUTDOWN_LOG_IO_ERROR.

SHUTDOWN_LOG_IO_ERROR is the right reason code to be set since
we are in the log path.

Thanks to Dave for suggesting this solution.
Signed-off-by: NChandra Seetharaman <sekharan@us.ibm.com>
Reviewed-by: NBen Myers <bpm@sgi.com>
Signed-off-by: NBen Myers <bpm@sgi.com>
      297aa637
    • J
      xfs: fix assertion failure in xfs_vm_write_failed() · 58e59854
      由 Jie Liu 提交于 
      In xfs_vm_write_failed(), we evaluate the block_offset of pos with
PAGE_MASK which is an unsigned long.  That is fine on 64-bit platforms
regardless of whether the request pos is 32-bit or 64-bit.  However, on
32-bit platforms the value is 0xfffff000 and so the high 32 bits in it
will be masked off with (pos & PAGE_MASK) for a 64-bit pos.

As a result, the evaluated block_offset is incorrect which will cause
this failure ASSERT(block_offset + from == pos); and potentially pass
the wrong block to xfs_vm_kill_delalloc_range().

In this case, we can get a kernel panic if CONFIG_XFS_DEBUG is enabled:

XFS: Assertion failed: block_offset + from == pos, file: fs/xfs/xfs_aops.c, line: 1504

------------[ cut here ]------------
 kernel BUG at fs/xfs/xfs_message.c:100!
 invalid opcode: 0000 [#1] SMP
 ........
 Pid: 4057, comm: mkfs.xfs Tainted: G           O 3.9.0-rc2 #1
 EIP: 0060:[<f94a7e8b>] EFLAGS: 00010282 CPU: 0
 EIP is at assfail+0x2b/0x30 [xfs]
 EAX: 00000056 EBX: f6ef28a0 ECX: 00000007 EDX: f57d22a4
 ESI: 1c2fb000 EDI: 00000000 EBP: ea6b5d30 ESP: ea6b5d1c
 DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
 CR0: 8005003b CR2: 094f3ff4 CR3: 2bcb4000 CR4: 000006f0
 DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
 DR6: ffff0ff0 DR7: 00000400
 Process mkfs.xfs (pid: 4057, ti=ea6b4000 task=ea5799e0 task.ti=ea6b4000)
 Stack:
 00000000 f9525c48 f951fa80 f951f96b 000005e4 ea6b5d7c f9494b34 c19b0ea2
 00000066 f3d6c620 c19b0ea2 00000000 e9a91458 00001000 00000000 00000000
 00000000 c15c7e89 00000000 1c2fb000 00000000 00000000 1c2fb000 00000080
 Call Trace:
 [<f9494b34>] xfs_vm_write_failed+0x74/0x1b0 [xfs]
 [<c15c7e89>] ? printk+0x4d/0x4f
 [<f9494d7d>] xfs_vm_write_begin+0x10d/0x170 [xfs]
 [<c110a34c>] generic_file_buffered_write+0xdc/0x210
 [<f949b669>] xfs_file_buffered_aio_write+0xf9/0x190 [xfs]
 [<f949b7f3>] xfs_file_aio_write+0xf3/0x160 [xfs]
 [<c115e504>] do_sync_write+0x94/0xd0
 [<c115ed1f>] vfs_write+0x8f/0x160
 [<c115e470>] ? wait_on_retry_sync_kiocb+0x50/0x50
 [<c115f017>] sys_write+0x47/0x80
 [<c15d860d>] sysenter_do_call+0x12/0x28
 .............
 EIP: [<f94a7e8b>] assfail+0x2b/0x30 [xfs] SS:ESP 0068:ea6b5d1c
 ---[ end trace cdd9af4f4ecab42f ]---
 Kernel panic - not syncing: Fatal exception

In order to avoid this, we can evaluate the block_offset of the start
of the page by using shifts rather than masks the mismatch problem.

Thanks Dave Chinner for help finding and fixing this bug.
Reported-by: NMichael L. Semon <mlsemon35@gmail.com>
Reviewed-by: NDave Chinner <david@fromorbit.com>
Reviewed-by: NMark Tinguely <tinguely@sgi.com>
Signed-off-by: NJie Liu <jeff.liu@oracle.com>
Signed-off-by: NBen Myers <bpm@sgi.com>
      58e59854
  9. 12 7月, 2013 1 次提交
  11. 11 7月, 2013 1 次提交
    • C
      xfs: Add pquota fields where gquota is used. · 92f8ff73
      由 Chandra Seetharaman 提交于 
      Add project quota changes to all the places where group quota field
is used:
   * add separate project quota members into various structures
   * split project quota and group quotas so that instead of overriding
     the group quota members incore, the new project quota members are
     used instead
   * get rid of usage of the OQUOTA flag incore, in favor of separate
     group and project quota flags.
   * add a project dquot argument to various functions.

Not using the pquotino field from superblock yet.
Signed-off-by: NChandra Seetharaman <sekharan@us.ibm.com>
Reviewed-by: NBen Myers <bpm@sgi.com>
Signed-off-by: NBen Myers <bpm@sgi.com>
      92f8ff73
  13. 10 7月, 2013 6 次提交
    • C
      xfs: fix sgid inheritance for subdirectories inheriting default acls [V3] · 42c49d7f
      由 Carlos Maiolino 提交于 
      XFS removes sgid bits of subdirectories under a directory containing a default
acl.

When a default acl is set, it implies xfs to call xfs_setattr_nonsize() in its
code path. Such function is shared among mkdir and chmod system calls, and
does some checks unneeded by mkdir (calling inode_change_ok()). Such checks
remove sgid bit from the inode after it has been granted.

With this patch, we extend the meaning of XFS_ATTR_NOACL flag to avoid these
checks when acls are being inherited (thanks hch).

Also, xfs_setattr_mode, doesn't need to re-check for group id and capabilities
permissions, this only implies in another try to remove sgid bit from the
directories. Such check is already done either on inode_change_ok() or
xfs_setattr_nonsize().

Changelog:

V2: Extends the meaning of XFS_ATTR_NOACL instead of wrap the tests into another
    function

V3: Remove S_ISDIR check in xfs_setattr_nonsize() from the patch
Signed-off-by: NCarlos Maiolino <cmaiolino@redhat.com>
Reviewed-by: NBen Myers <bpm@sgi.com>
Signed-off-by: NBen Myers <bpm@sgi.com>
      42c49d7f
    • D
      xfs: dquot log reservations are too small · b0a9dab7
      由 Dave Chinner 提交于 
      During review of the separate project quota inode patches, it became
obvious that the dquot log reservation calculation underestimated
the number dquots that can be modified in a transaction. This has
it's roots way back in the Irix quota implementation.

That is, when quotas were first implemented in XFS, it only
supported user and project quotas as Irix did not have group quotas.
Hence the worst case operation involving dquot modification was
calculated to involve 2 user dquots and 1 project dquot or 1 user
dequot and 2 project dquots. i.e. 3 dquots. This was determined back
in 1996, and has remained unchanged ever since.

However, back in 2001, the Linux XFS port dropped all support for
project quota and implmented group quotas over the top. This was
effectively done with a search-and-replace of project with group,
and as such the log reservation was not changed. However, with the
advent of group quotas, chmod and rename now could modify more than
3 dquots in a single transaction - both could modify 4 dquots. Hence
this log reservation has been wrong for a long time.

In 2005, project quota support was reintroduced into Linux, but it
was implemented to be mutually exclusive to group quotas and so this
didn't add any new changes to the dquot log reservation. Hence when
project quotas were in use (rather than group quotas) the log
reservation was again valid, just like in the Irix days.

Now, with the addition of the separate project quota inode, group
and project quotas are no longer mutually exclusive, and hence
operations can now modify three dquots per inode where previously it
was only two. The worst case here is the rename transaction, which
can allocate/free space on two different directory inodes, and if
they have different uid/gid/prid configurations and are world
writeable, then rename can actually modify 6 different dquots now.

Further, the dquot log reservation doesn't take into account the
space used by the dquot log format structure that precedes the dquot
that is logged, and hence further underestimates the worst case
log space required by dquots during a transaction. This has been
missing since the first commit in 1996.

Hence the worst case log reservation needs to be increased from 3 to
6, and it needs to take into account a log format header for each of
those dquots.
Signed-off-by: NDave Chinner <dchinner@redhat.com>
Reviewed-by: NMark Tinguely <tinguely@sgi.com>
Signed-off-by: NBen Myers <bpm@sgi.com>
      b0a9dab7
    • D
      xfs: remove local fork format handling from xfs_bmapi_write() · f3508bcd
      由 Dave Chinner 提交于 
      The conversion from local format to extent format requires
interpretation of the data in the fork being converted, so it cannot
be done in a generic way. It is up to the caller to convert the fork
format to extent format before calling into xfs_bmapi_write() so
format conversion can be done correctly.

The code in xfs_bmapi_write() to convert the format is used
implicitly by the attribute and directory code, but they
specifically zero the fork size so that the conversion does not do
any allocation or manipulation. Move this conversion into the
shortform to leaf functions for the dir/attr code so the conversions
are explicitly controlled by all callers.

Now we can remove the conversion code in xfs_bmapi_write.
Signed-off-by: NDave Chinner <dchinner@redhat.com>
Reviewed-by: NMark Tinguely <tinguely@sgi.com>
Signed-off-by: NBen Myers <bpm@sgi.com>
      f3508bcd
    • Y
      xfs: use get_unused_fd_flags(0) instead of get_unused_fd() · 862a6293
      由 Yann Droneaud 提交于 
      Macro get_unused_fd() is used to allocate a file descriptor with
default flags. Those default flags (0) can be "unsafe":
O_CLOEXEC must be used by default to not leak file descriptor
across exec().

Instead of macro get_unused_fd(), functions anon_inode_getfd()
or get_unused_fd_flags() should be used with flags given by userspace.
If not possible, flags should be set to O_CLOEXEC to provide userspace
with a default safe behavor.

In a further patch, get_unused_fd() will be removed so that
new code start using anon_inode_getfd() or get_unused_fd_flags()
with correct flags.

This patch replaces calls to get_unused_fd() with equivalent call to
get_unused_fd_flags(0) to preserve current behavor for existing code.

The hard coded flag value (0) should be reviewed on a per-subsystem basis,
and, if possible, set to O_CLOEXEC.
Signed-off-by: NYann Droneaud <ydroneaud@opteya.com>
Reviewed-by: NBen Myers <bpm@sgi.com>
Signed-off-by: NBen Myers <bpm@sgi.com>
      862a6293
    • J
      xfs: clean up unused codes at xfs_bulkstat() · 9cee4c5b
      由 Jie Liu 提交于 
      There are some unused codes at xfs_bulkstat():

- Variable bp is defined to point to the on-disk inode cluster
  buffer, but it proved to be of no practical help.

- We process the chunks of good inodes which were fetched by iterating
  btree records from an AG.  When processing inodes from each chunk,
  the code recomputing agbno if run into the first inode of a cluster,
  however, the agbno is not being used thereafter.

This patch tries to clean up those things.
Signed-off-by: NJie Liu <jeff.liu@oracle.com>
Reviewed-by: NDave Chinner <dchinner@redhat.com>
Signed-off-by: NBen Myers <bpm@sgi.com>
      9cee4c5b
    • E
      xfs: use XFS_BMAP_BMDR_SPACE vs. XFS_BROOT_SIZE_ADJ · a69c7c07
      由 Eric Sandeen 提交于 
      XFS_BROOT_SIZE_ADJ is an undocumented macro which accounts for
the difference in size between the on-disk and in-core btree
root.  It's much clearer to just use the newly-added
XFS_BMAP_BMDR_SPACE macro which gives us the on-disk size
directly.

In one case, we must test that the if_broot exists before
applying the macro, however.
Signed-off-by: NEric Sandeen <sandeen@redhat.com>
Reviewed-by: NDave Chinner <dchinner@redhat.com>
Reviewed-by: NBen Myers <bpm@sgi.com>
Signed-off-by: NBen Myers <bpm@sgi.com>
      a69c7c07
  15. 03 7月, 2013 1 次提交
    • J
      vfs: export lseek_execute() to modules · 46a1c2c7
      由 Jie Liu 提交于 
      For those file systems(btrfs/ext4/ocfs2/tmpfs) that support
SEEK_DATA/SEEK_HOLE functions, we end up handling the similar
matter in lseek_execute() to update the current file offset
to the desired offset if it is valid, ceph also does the
simliar things at ceph_llseek().

To reduce the duplications, this patch make lseek_execute()
public accessible so that we can call it directly from the
underlying file systems.

Thanks Dave Chinner for this suggestion.

[AV: call it vfs_setpos(), don't bring the removed 'inode' argument back]

v2->v1:
- Add kernel-doc comments for lseek_execute()
- Call lseek_execute() in ceph->llseek()
Signed-off-by: NJie Liu <jeff.liu@oracle.com>
Cc: Dave Chinner <dchinner@redhat.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Chris Mason <chris.mason@fusionio.com>
Cc: Josef Bacik <jbacik@fusionio.com>
Cc: Ben Myers <bpm@sgi.com>
Cc: Ted Tso <tytso@mit.edu>
Cc: Hugh Dickins <hughd@google.com>
Cc: Mark Fasheh <mfasheh@suse.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Sage Weil <sage@inktank.com>
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
      46a1c2c7
  17. 29 6月, 2013 3 次提交