kernel/linux.git/fs/f2fs/extent_cache.c, branch v6.1.168

f2fs: fix KMSAN uninit-value in extent_info usage

2025-08-15T10:05:06+00:00

[ Upstream commit 154467f4ad033473e5c903a03e7b9bca7df9a0fa ] KMSAN reported a use of uninitialized value in `__is_extent_mergeable()` and `__is_back_mergeable()` via the read extent tree path. The root cause is that `get_read_extent_info()` only initializes three fields (`fofs`, `blk`, `len`) of `struct extent_info`, leaving the remaining fields uninitialized. This leads to undefined behavior when those fields are accessed later, especially during extent merging. Fix it by zero-initializing the `extent_info` struct before population. Reported-by: syzbot+b8c1d60e95df65e827d4@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=b8c1d60e95df65e827d4 Fixes: 94afd6d6e525 ("f2fs: extent cache: support unaligned extent") Reviewed-by: Chao Yu Signed-off-by: Abinash Singh Signed-off-by: Jaegeuk Kim Signed-off-by: Sasha Levin

f2fs: fix several potential integer overflows in file offsets

2024-10-17T13:21:22+00:00

commit 1cade98cf6415897bf9342ee451cc5b40b58c638 upstream. When dealing with large extents and calculating file offsets by summing up according extent offsets and lengths of unsigned int type, one may encounter possible integer overflow if the values are big enough. Prevent this from happening by expanding one of the addends to (pgoff_t) type. Found by Linux Verification Center (linuxtesting.org) with static analysis tool SVACE. Fixes: d323d005ac4a ("f2fs: support file defragment") Cc: stable@vger.kernel.org Signed-off-by: Nikita Zhandarovich Reviewed-by: Chao Yu Signed-off-by: Jaegeuk Kim Signed-off-by: Greg Kroah-Hartman

f2fs: fix typos in comments

2024-06-12T09:03:37+00:00

[ Upstream commit 146949defda868378992171b9e42318b06fcd482 ] This patch is to fix typos in f2fs files. Signed-off-by: Jinyoung Choi Reviewed-by: Chao Yu Signed-off-by: Jaegeuk Kim Stable-dep-of: 278a6253a673 ("f2fs: fix to relocate check condition in f2fs_fallocate()") Signed-off-by: Sasha Levin

f2fs: inode: fix to do sanity check on extent cache correctly

2023-05-17T09:53:59+00:00

commit 269d119481008cd725ce32553332593c0ecfc91c upstream. In do_read_inode(), sanity check for extent cache should be called after f2fs_init_read_extent_tree(), fix it. Fixes: 72840cccc0a1 ("f2fs: allocate the extent_cache by default") Signed-off-by: Chao Yu Signed-off-by: Jaegeuk Kim Signed-off-by: Greg Kroah-Hartman

f2fs: factor out victim_entry usage from general rb_tree use

2023-05-17T09:53:53+00:00

[ Upstream commit 043d2d00b44310f84c0593c63e51fae88c829cdd ] Let's reduce the complexity of mixed use of rb_tree in victim_entry from extent_cache and discard_cmd. This should fix arm32 memory alignment issue caused by shared rb_entry. [struct victim_entry] [struct rb_entry] [0] struct rb_node rb_node; [0] struct rb_node rb_node; union { struct { unsigned int ofs; unsigned int len; }; [16] unsigned long long mtime; [12] unsigned long long key; } __packed; Cc: Fixes: 093749e296e2 ("f2fs: support age threshold based garbage collection") Reviewed-by: Chao Yu Signed-off-by: Jaegeuk Kim Signed-off-by: Sasha Levin

f2fs: allocate the extent_cache by default

2023-05-17T09:53:52+00:00

[ Upstream commit 72840cccc0a1a0a0dc1bb27b669a9111be6d0f6a ] Let's allocate it to remove the runtime complexity. Signed-off-by: Jaegeuk Kim Stable-dep-of: 043d2d00b443 ("f2fs: factor out victim_entry usage from general rb_tree use") Signed-off-by: Sasha Levin

f2fs: refactor extent_cache to support for read and more

2023-05-17T09:53:52+00:00

[ Upstream commit e7547daccd6a37522f0af74ec4b5a3036f3dd328 ] This patch prepares extent_cache to be ready for addition. Reviewed-by: Chao Yu Signed-off-by: Jaegeuk Kim Stable-dep-of: 043d2d00b443 ("f2fs: factor out victim_entry usage from general rb_tree use") Signed-off-by: Sasha Levin

f2fs: remove unnecessary __init_extent_tree

2023-05-17T09:53:52+00:00

[ Upstream commit 749d543c0d451fff31e8f7a3e0a031ffcbf1ebb1 ] Added into the caller. Reviewed-by: Chao Yu Signed-off-by: Jaegeuk Kim Stable-dep-of: 043d2d00b443 ("f2fs: factor out victim_entry usage from general rb_tree use") Signed-off-by: Sasha Levin

f2fs: move internal functions into extent_cache.c

2023-05-17T09:53:52+00:00

[ Upstream commit 3bac20a8f011b8ed4012b43f4f33010432b3c647 ] No functional change. Reviewed-by: Chao Yu Signed-off-by: Jaegeuk Kim Stable-dep-of: 043d2d00b443 ("f2fs: factor out victim_entry usage from general rb_tree use") Signed-off-by: Sasha Levin

f2fs: specify extent cache for read explicitly

2023-05-17T09:53:52+00:00

[ Upstream commit 12607c1ba7637e750402f555b6695c50fce77a2b ] Let's descrbie it's read extent cache. Reviewed-by: Chao Yu Signed-off-by: Jaegeuk Kim Stable-dep-of: 043d2d00b443 ("f2fs: factor out victim_entry usage from general rb_tree use") Signed-off-by: Sasha Levin