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| author | Ritesh Harjani (IBM) <ritesh.list@gmail.com> | 2023-09-07 09:47:32 -0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2023-09-07 15:17:02 -0400 |
| commit | 147d4a092e9a726ce706dbf0d329d2b96a025459 (patch) | |
| tree | 82a9ce1e19bf13d0c8bd3b4937a2ffd0a214b4cc /tools/testing/selftests/bpf/prog_tests/prog_array_init.c | |
| parent | f94cf2206b066bd6d761d3347fd35f77b828c376 (diff) | |
jbd2: Remove page size assumptions
jbd2_alloc() allocates a buffer from slab when the block size is smaller
than PAGE_SIZE, and slab may be using a compound page. Before commit
8147c4c4546f, we set b_page to the precise page containing the buffer
and this code worked well. Now we set b_page to the head page of the
allocation, so we can no longer use offset_in_page(). While we could
do a 1:1 replacement with offset_in_folio(), use the more idiomatic
bh_offset() and the folio APIs to map the buffer.
This isn't enough to support a b_size larger than PAGE_SIZE on HIGHMEM
machines, but this is good enough to fix the actual bug we're seeing.
Fixes: 8147c4c4546f ("jbd2: use a folio in jbd2_journal_write_metadata_buffer()")
Reported-by: Zorro Lang <zlang@kernel.org>
Signed-off-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
[converted to be more folio]
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Diffstat (limited to 'tools/testing/selftests/bpf/prog_tests/prog_array_init.c')
0 files changed, 0 insertions, 0 deletions