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| author | Baokun Li <libaokun1@huawei.com> | 2025-11-21 17:06:41 +0800 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2025-11-28 22:35:27 -0500 |
| commit | 6117f1806a7328e8d316eeeac66b2ba4e4539ba5 (patch) | |
| tree | 65d1ad6183330b9e10152c5ae09d33e83abc2497 /rust/proc-macro2/rcvec.rs | |
| parent | 2a8de76b2b0f84333a2778db04ce51811c260d9d (diff) | |
ext4: support large block size in ext4_mb_load_buddy_gfp()
Currently, ext4_mb_load_buddy_gfp() uses blocks_per_page to calculate the
folio index and offset. However, when blocksize is larger than PAGE_SIZE,
blocks_per_page becomes zero, leading to a potential division-by-zero bug.
To support BS > PS, use bytes to compute folio index and offset within
folio to get rid of blocks_per_page.
Also, if buddy and bitmap land in the same folio, we get that folio’s ref
instead of looking it up again before updating the buddy.
Signed-off-by: Baokun Li <libaokun1@huawei.com>
Reviewed-by: Zhang Yi <yi.zhang@huawei.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Ojaswin Mujoo <ojaswin@linux.ibm.com>
Message-ID: <20251121090654.631996-12-libaokun@huaweicloud.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'rust/proc-macro2/rcvec.rs')
0 files changed, 0 insertions, 0 deletions