Skip to content

R
raspberrypi-kernel

openeuler / raspberrypi-kernel

通知 13
Star 1
Fork 0
R
raspberrypi-kernel
切换分支/标签
  1. 06 12月, 2016 6 次提交
  3. 30 11月, 2016 4 次提交
  5. 25 10月, 2016 1 次提交
  7. 28 9月, 2016 1 次提交
  9. 27 9月, 2016 1 次提交
  11. 22 9月, 2016 1 次提交
  13. 25 8月, 2016 1 次提交
  15. 26 7月, 2016 3 次提交
  17. 26 5月, 2016 2 次提交
  19. 13 5月, 2016 1 次提交
  21. 06 5月, 2016 5 次提交
  23. 03 5月, 2016 1 次提交
  25. 02 5月, 2016 1 次提交
  27. 29 4月, 2016 1 次提交
  29. 28 4月, 2016 6 次提交
  31. 05 4月, 2016 1 次提交
    • K
      mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros · 09cbfeaf
      由 Kirill A. Shutemov 提交于 
      PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.

This promise never materialized.  And unlikely will.

We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE.  And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.

Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.

Let's stop pretending that pages in page cache are special.  They are
not.

The changes are pretty straight-forward:

 - <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;

 - <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;

 - PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};

 - page_cache_get() -> get_page();

 - page_cache_release() -> put_page();

This patch contains automated changes generated with coccinelle using
script below.  For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.

The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.

There are few places in the code where coccinelle didn't reach.  I'll
fix them manually in a separate patch.  Comments and documentation also
will be addressed with the separate patch.

virtual patch

@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E

@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E

@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT

@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE

@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK

@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)

@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)

@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: NKirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: NMichal Hocko <mhocko@suse.com>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      09cbfeaf
  33. 04 4月, 2016 1 次提交
  35. 12 3月, 2016 1 次提交
  37. 02 3月, 2016 2 次提交
    • F
      Btrfs: fix extent_same allowing destination offset beyond i_size · f4dfe687
      由 Filipe Manana 提交于 
      When using the same file as the source and destination for a dedup
(extent_same ioctl) operation we were allowing it to dedup to a
destination offset beyond the file's size, which doesn't make sense and
it's not allowed for the case where the source and destination files are
not the same file. This made de deduplication operation successful only
when the source range corresponded to a hole, a prealloc extent or an
extent with all bytes having a value of 0x00. This was also leaving a
file hole (between i_size and destination offset) without the
corresponding file extent items, which can be reproduced with the
following steps for example:

  $ mkfs.btrfs -f /dev/sdi
  $ mount /dev/sdi /mnt/sdi

  $ xfs_io -f -c "pwrite -S 0xab 304457 404990" /mnt/sdi/foobar
  wrote 404990/404990 bytes at offset 304457
  395 KiB, 99 ops; 0.0000 sec (31.150 MiB/sec and 7984.5149 ops/sec)

  $ /git/hub/duperemove/btrfs-extent-same 24576 /mnt/sdi/foobar 28672 /mnt/sdi/foobar 929792
  Deduping 2 total files
  (28672, 24576): /mnt/sdi/foobar
  (929792, 24576): /mnt/sdi/foobar
  1 files asked to be deduped
  i: 0, status: 0, bytes_deduped: 24576
  24576 total bytes deduped in this operation

  $ umount /mnt/sdi
  $ btrfsck /dev/sdi
  Checking filesystem on /dev/sdi
  UUID: 98c528aa-0833-427d-9403-b98032ffbf9d
  checking extents
  checking free space cache
  checking fs roots
  root 5 inode 257 errors 100, file extent discount
  Found file extent holes:
          start: 712704, len: 217088
  found 540673 bytes used err is 1
  total csum bytes: 400
  total tree bytes: 131072
  total fs tree bytes: 32768
  total extent tree bytes: 16384
  btree space waste bytes: 123675
  file data blocks allocated: 671744
    referenced 671744
  btrfs-progs v4.2.3

So fix this by not allowing the destination to go beyond the file's size,
just as we do for the same where the source and destination files are not
the same.

A test for xfstests follows.
Signed-off-by: NFilipe Manana <fdmanana@suse.com>
Signed-off-by: NChris Mason <clm@fb.com>
      f4dfe687
    • F
      Btrfs: fix file loss on log replay after renaming a file and fsync · 2be63d5c
      由 Filipe Manana 提交于 
      We have two cases where we end up deleting a file at log replay time
when we should not. For this to happen the file must have been renamed
and a directory inode must have been fsynced/logged.

Two examples that exercise these two cases are listed below.

  Case 1)

  $ mkfs.btrfs -f /dev/sdb
  $ mount /dev/sdb /mnt
  $ mkdir -p /mnt/a/b
  $ mkdir /mnt/c
  $ touch /mnt/a/b/foo
  $ sync
  $ mv /mnt/a/b/foo /mnt/c/
  # Create file bar just to make sure the fsync on directory a/ does
  # something and it's not a no-op.
  $ touch /mnt/a/bar
  $ xfs_io -c "fsync" /mnt/a
  < power fail / crash >

  The next time the filesystem is mounted, the log replay procedure
  deletes file foo.

  Case 2)

  $ mkfs.btrfs -f /dev/sdb
  $ mount /dev/sdb /mnt
  $ mkdir /mnt/a
  $ mkdir /mnt/b
  $ mkdir /mnt/c
  $ touch /mnt/a/foo
  $ ln /mnt/a/foo /mnt/b/foo_link
  $ touch /mnt/b/bar
  $ sync
  $ unlink /mnt/b/foo_link
  $ mv /mnt/b/bar /mnt/c/
  $ xfs_io -c "fsync" /mnt/a/foo
  < power fail / crash >

  The next time the filesystem is mounted, the log replay procedure
  deletes file bar.

The reason why the files are deleted is because when we log inodes
other then the fsync target inode, we ignore their last_unlink_trans
value and leave the log without enough information to later replay the
rename operations. So we need to look at the last_unlink_trans values
and fallback to a transaction commit if they are greater than the
id of the last committed transaction.

So fix this by looking at the last_unlink_trans values and fallback to
transaction commits when needed. Also, when logging other inodes (for
case 1 we logged descendants of the fsync target inode while for case 2
we logged ascendants) we need to care about concurrent tasks updating
the last_unlink_trans of inodes we are logging (which was already an
existing problem in check_parent_dirs_for_sync()). Since we can not
acquire their inode mutex (vfs' struct inode ->i_mutex), as that causes
deadlocks with other concurrent operations that acquire the i_mutex of
2 inodes (other fsyncs or renames for example), we need to serialize on
the log_mutex of the inode we are logging. A task setting a new value for
an inode's last_unlink_trans must acquire the inode's log_mutex and it
must do this update before doing the actual unlink operation (which is
already the case except when deleting a snapshot). Conversely the task
logging the inode must first log the inode and then check the inode's
last_unlink_trans value while holding its log_mutex, as if its value is
not greater then the id of the last committed transaction it means it
logged a safe state of the inode's items, while if its value is not
smaller then the id of the last committed transaction it means the inode
state it has logged might not be safe (the concurrent task might have
just updated last_unlink_trans but hasn't done yet the unlink operation)
and therefore a transaction commit must be done.

Test cases for xfstests follow in separate patches.
Signed-off-by: NFilipe Manana <fdmanana@suse.com>
Signed-off-by: NChris Mason <clm@fb.com>
      2be63d5c