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Merge branch 'for-linus-4.10' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs

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Pull btrfs fixes from Chris Mason:
 "This has two last minute fixes. The highest priority here is a
  regression fix for the decompression code, but we also fixed up a
  problem with the 32-bit compat ioctls.

  The decompression bug could hand back the wrong data on big reads when
  zlib was used. I have a larger cleanup to make the math here less
  error prone, but at this stage in the release Omar's patch is the best
  choice"

* 'for-linus-4.10' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs:
  btrfs: fix btrfs_decompress_buf2page()
  btrfs: fix btrfs_compat_ioctl failures on non-compat ioctls
This commit is contained in:
Linus Torvalds 2017-02-11 09:15:58 -08:00
commit 2b95550a43
2 changed files with 28 additions and 17 deletions
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39
fs/btrfs/compression.c
View File

@ -1024,6 +1024,7 @@ int btrfs_decompress_buf2page(char *buf, unsigned long buf_start,
unsigned long buf_offset;
unsigned long current_buf_start;
unsigned long start_byte;
unsigned long prev_start_byte;
unsigned long working_bytes = total_out - buf_start;
unsigned long bytes;
char *kaddr;
@ -1071,26 +1072,34 @@ int btrfs_decompress_buf2page(char *buf, unsigned long buf_start,
if (!bio->bi_iter.bi_size)
return 0;
bvec = bio_iter_iovec(bio, bio->bi_iter);
prev_start_byte = start_byte;
start_byte = page_offset(bvec.bv_page) - disk_start;
/*
* make sure our new page is covered by this
* working buffer
* We need to make sure we're only adjusting
* our offset into compression working buffer when
* we're switching pages. Otherwise we can incorrectly
* keep copying when we were actually done.
*/
if (total_out <= start_byte)
return 1;
if (start_byte != prev_start_byte) {
/*
* make sure our new page is covered by this
* working buffer
*/
if (total_out <= start_byte)
return 1;
/*
* the next page in the biovec might not be adjacent
* to the last page, but it might still be found
* inside this working buffer. bump our offset pointer
*/
if (total_out > start_byte &&
current_buf_start < start_byte) {
buf_offset = start_byte - buf_start;
working_bytes = total_out - start_byte;
current_buf_start = buf_start + buf_offset;
/*
* the next page in the biovec might not be adjacent
* to the last page, but it might still be found
* inside this working buffer. bump our offset pointer
*/
if (total_out > start_byte &&
current_buf_start < start_byte) {
buf_offset = start_byte - buf_start;
working_bytes = total_out - start_byte;
current_buf_start = buf_start + buf_offset;
}
}
}

6
fs/btrfs/ioctl.c
View File

@ -5653,6 +5653,10 @@ long btrfs_ioctl(struct file *file, unsigned int
#ifdef CONFIG_COMPAT
long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
/*
* These all access 32-bit values anyway so no further
* handling is necessary.
*/
switch (cmd) {
case FS_IOC32_GETFLAGS:
cmd = FS_IOC_GETFLAGS;
@ -5663,8 +5667,6 @@ long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
case FS_IOC32_GETVERSION:
cmd = FS_IOC_GETVERSION;
break;
default:
return -ENOIOCTLCMD;
}
return btrfs_ioctl(file, cmd, (unsigned long) compat_ptr(arg));