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511a1303c9
[BUG]
There is a bug report that btrfs driver caused hang during file read:
This breaks btrfs on the HiFive Unmatched.
=> pci enum
PCIE-0: Link up (Gen1-x8, Bus0)
=> nvme scan
=> load nvme 0:2 0x8c000000 /boot/dtb/sifive/hifive-unmatched-a00.dtb
[hangs]
[CAUSE]
The reporter provided some debug output:
read_extent_data: cur=615817216, orig_len=16384, cur_len=16384
read_extent_data: btrfs_map_block: cur_len=479944704; ret=0
read_extent_data: ret=0
read_extent_data: cur=615833600, orig_len=4096, cur_len=4096
read_extent_data: btrfs_map_block: cur_len=479928320; ret=0
Note the second and the last line, the @cur_len is 450+MiB, which is
almost a chunk size.
And inside __btrfs_map_block(), we limits the returned value to stripe
length, but that's depending on the chunk type:
if (map->type & (BTRFS_BLOCK_GROUP_RAID0 | BTRFS_BLOCK_GROUP_RAID1 |
BTRFS_BLOCK_GROUP_RAID1C3 | BTRFS_BLOCK_GROUP_RAID1C4 |
BTRFS_BLOCK_GROUP_RAID5 | BTRFS_BLOCK_GROUP_RAID6 |
BTRFS_BLOCK_GROUP_RAID10 |
BTRFS_BLOCK_GROUP_DUP)) {
/* we limit the length of each bio to what fits in a stripe */
*length = min_t(u64, ce->size - offset,
map->stripe_len - stripe_offset);
} else {
*length = ce->size - offset;
}
This means, if the chunk is SINGLE profile, then we don't limit the
returned length at all, and even for other profiles, we can still return
a length much larger than the requested one.
[FIX]
Properly clamp the returned length, preventing it from returning a much
larger range than expected.
Reported-by: Andreas Schwab <schwab@linux-m68k.org>
Signed-off-by: Qu Wenruo <wqu@suse.com>
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||
|---|---|---|
| .. | ||
| common | ||
| crypto | ||
| kernel-shared | ||
| btrfs.c | ||
| btrfs.h | ||
| compat.h | ||
| compression.c | ||
| conv-funcs.h | ||
| ctree.c | ||
| ctree.h | ||
| dev.c | ||
| dir-item.c | ||
| disk-io.c | ||
| disk-io.h | ||
| extent-cache.c | ||
| extent-cache.h | ||
| extent-io.c | ||
| extent-io.h | ||
| inode.c | ||
| Kconfig | ||
| Makefile | ||
| root-tree.c | ||
| subvolume.c | ||
| volumes.c | ||
| volumes.h | ||