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  1. 12 10月, 2017 3 次提交
  3. 27 9月, 2017 2 次提交
  5. 02 9月, 2017 14 次提交
  7. 23 8月, 2017 1 次提交
    • C
      xfs: stop searching for free slots in an inode chunk when there are none · 2d32311c
      由 Carlos Maiolino 提交于 
      In a filesystem without finobt, the Space manager selects an AG to alloc a new
inode, where xfs_dialloc_ag_inobt() will search the AG for the free slot chunk.

When the new inode is in the same AG as its parent, the btree will be searched
starting on the parent's record, and then retried from the top if no slot is
available beyond the parent's record.

To exit this loop though, xfs_dialloc_ag_inobt() relies on the fact that the
btree must have a free slot available, once its callers relied on the
agi->freecount when deciding how/where to allocate this new inode.

In the case when the agi->freecount is corrupted, showing available inodes in an
AG, when in fact there is none, this becomes an infinite loop.

Add a way to stop the loop when a free slot is not found in the btree, making
the function to fall into the whole AG scan which will then, be able to detect
the corruption and shut the filesystem down.

As pointed by Brian, this might impact performance, giving the fact we
don't reset the search distance anymore when we reach the end of the
tree, giving it fewer tries before falling back to the whole AG search, but
it will only affect searches that start within 10 records to the end of the tree.
Signed-off-by: NCarlos Maiolino <cmaiolino@redhat.com>
Reviewed-by: NDarrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: NDarrick J. Wong <darrick.wong@oracle.com>
      2d32311c
  9. 12 8月, 2017 1 次提交
    • O
      xfs: fix inobt inode allocation search optimization · c44245b3
      由 Omar Sandoval 提交于 
      When we try to allocate a free inode by searching the inobt, we try to
find the inode nearest the parent inode by searching chunks both left
and right of the chunk containing the parent. As an optimization, we
cache the leftmost and rightmost records that we previously searched; if
we do another allocation with the same parent inode, we'll pick up the
search where it last left off.

There's a bug in the case where we found a free inode to the left of the
parent's chunk: we need to update the cached left and right records, but
because we already reassigned the right record to point to the left, we
end up assigning the left record to both the cached left and right
records.

This isn't a correctness problem strictly, but it can result in the next
allocation rechecking chunks unnecessarily or allocating inodes further
away from the parent than it needs to. Fix it by swapping the record
pointer after we update the cached left and right records.

Fixes: bd169565 ("xfs: speed up free inode search")
Signed-off-by: NOmar Sandoval <osandov@fb.com>
Reviewed-by: NChristoph Hellwig <hch@lst.de>
Reviewed-by: NDarrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: NDarrick J. Wong <darrick.wong@oracle.com>
      c44245b3
  11. 26 7月, 2017 1 次提交
  13. 25 7月, 2017 1 次提交
  15. 21 7月, 2017 3 次提交
  17. 14 7月, 2017 2 次提交
  19. 08 7月, 2017 1 次提交
    • D
      xfs: don't crash on unexpected holes in dir/attr btrees · cd87d867
      由 Darrick J. Wong 提交于 
      In quite a few places we call xfs_da_read_buf with a mappedbno that we
don't control, then assume that the function passes back either an error
code or a buffer pointer.  Unfortunately, if mappedbno == -2 and bno
maps to a hole, we get a return code of zero and a NULL buffer, which
means that we crash if we actually try to use that buffer pointer.  This
happens immediately when we set the buffer type for transaction context.

Therefore, check that we have no error code and a non-NULL bp before
trying to use bp.  This patch is a follow-up to an incomplete fix in
96a3aefb ("xfs: don't crash if reading a directory results in an
unexpected hole").
Signed-off-by: NDarrick J. Wong <darrick.wong@oracle.com>
      cd87d867
  21. 07 7月, 2017 1 次提交
    • D
      xfs: rename MAXPATHLEN to XFS_SYMLINK_MAXLEN · 6eb0b8df
      由 Darrick J. Wong 提交于 
      XFS has a maximum symlink target length of 1024 bytes; this is a
holdover from the Irix days.  Unfortunately, the constant establishing
this is 'MAXPATHLEN' and is /not/ the same as the Linux MAXPATHLEN,
which is 4096.

The kernel enforces its 1024 byte MAXPATHLEN on symlink targets, but
xfsprogs picks up the (Linux) system 4096 byte MAXPATHLEN, which means
that xfs_repair doesn't complain about oversized symlinks.

Since this is an on-disk format constraint, put the define in the XFS
namespace and move everything over to use the new name.
Signed-off-by: NDarrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: NBrian Foster <bfoster@redhat.com>
      6eb0b8df
  23. 28 6月, 2017 2 次提交
  25. 21 6月, 2017 3 次提交
  27. 20 6月, 2017 5 次提交