kernel/linux.git/Documentation/ABI/testing, branch v6.12.95

erofs: tidy up synchronous decompression

2026-06-19T11:42:18+00:00

[ Upstream commit cc831ab33644088c1eef78936de24701014d520a ] - Get rid of `sbi->opt.max_sync_decompress_pages` since it's fixed as 3 all the time; - Add Z_EROFS_MAX_SYNC_DECOMPRESS_BYTES in bytes instead of in pages, since for non-4K pages, 3-page limitation makes no sense; - Move `sync_decompress` to sbi to avoid unexpected remount impact; - Fold z_erofs_is_sync_decompress() into its caller; - Better description of sysfs entry `sync_decompress`. Reviewed-by: Chao Yu Signed-off-by: Gao Xiang Stable-dep-of: 1aee05e814d2 ("erofs: fix use-after-free on sbi->sync_decompress") Signed-off-by: Sasha Levin

erofs: add sysfs node to drop internal caches

2026-06-19T11:42:18+00:00

[ Upstream commit db80b98305f73ca83891e4228ead5f0324118b00 ] Add a sysfs node to drop compression-related caches, currently used to drop in-memory pclusters and cached compressed folios. Signed-off-by: Chunhai Guo Reviewed-by: Gao Xiang Link: https://lore.kernel.org/r/20241113041148.749129-1-guochunhai@vivo.com Signed-off-by: Gao Xiang Stable-dep-of: 1aee05e814d2 ("erofs: fix use-after-free on sbi->sync_decompress") Signed-off-by: Sasha Levin

f2fs: add gc_boost_gc_greedy sysfs node

2025-12-18T12:55:16+00:00

[ Upstream commit c8705cefce44fbe85ca3b180dee0e0b5f3d51dc5 ] Add this to control GC algorithm for boost GC. Signed-off-by: Daeho Jeong Reviewed-by: Chao Yu Signed-off-by: Jaegeuk Kim Stable-dep-of: e462fc48ceb8 ("f2fs: maintain one time GC mode is enabled during whole zoned GC cycle") Signed-off-by: Sasha Levin

f2fs: add gc_boost_gc_multiple sysfs node

2025-12-18T12:55:16+00:00

[ Upstream commit 1d4c5dbba1a53aeaf2c6cc84e7ba94c436d18852 ] Add a sysfs knob to set a multiplier for the background GC migration window when F2FS Garbage Collection is boosted. Signed-off-by: Daeho Jeong Reviewed-by: Chao Yu Signed-off-by: Jaegeuk Kim Stable-dep-of: e462fc48ceb8 ("f2fs: maintain one time GC mode is enabled during whole zoned GC cycle") Signed-off-by: Sasha Levin

f2fs: introduce reserved_pin_section sysfs entry

2025-12-18T12:55:16+00:00

[ Upstream commit 59c1c89e9ba8cefff05aa982dd9e6719f25e8ec5 ] This patch introduces /sys/fs/f2fs//reserved_pin_section for tuning @needed parameter of has_not_enough_free_secs(), if we configure it w/ zero, it can avoid f2fs_gc() as much as possible while fallocating on pinned file. Signed-off-by: Chao Yu Reviewed-by: wangzijie Signed-off-by: Jaegeuk Kim Stable-dep-of: e462fc48ceb8 ("f2fs: maintain one time GC mode is enabled during whole zoned GC cycle") Signed-off-by: Sasha Levin

f2fs: sysfs: add encoding_flags entry

2025-12-18T12:55:16+00:00

[ Upstream commit 3fea0641b06ff4e53d95d07a96764d8951d4ced6 ] This patch adds a new sysfs entry /sys/fs/f2fs//encoding_flags, it is a read-only entry to show the value of sb.s_encoding_flags, the value is hexadecimal. ============================ ========== Flag_Name Flag_Value ============================ ========== SB_ENC_STRICT_MODE_FL 0x00000001 SB_ENC_NO_COMPAT_FALLBACK_FL 0x00000002 ============================ ========== case#1 mkfs.f2fs -f -O casefold -C utf8:strict /dev/vda mount /dev/vda /mnt/f2fs cat /sys/fs/f2fs/vda/encoding_flags 1 case#2 mkfs.f2fs -f -O casefold -C utf8 /dev/vda fsck.f2fs --nolinear-lookup=1 /dev/vda mount /dev/vda /mnt/f2fs cat /sys/fs/f2fs/vda/encoding_flags 2 Signed-off-by: Chao Yu Signed-off-by: Jaegeuk Kim Stable-dep-of: e462fc48ceb8 ("f2fs: maintain one time GC mode is enabled during whole zoned GC cycle") Signed-off-by: Sasha Levin

f2fs: add carve_out sysfs node

2025-12-18T12:55:15+00:00

[ Upstream commit d7b549def0eb42a950eebd3bd5343f5c8088c305 ] For several zoned storage devices, vendors will provide extra space which was used for device level GC than specs and F2FS can use this space for filesystem level GC. To do that, we can reserve the space using reserved_blocks. However, it is not enough, since this extra space should not be shown to users. So, with this new sysfs node, we can hide the space by substracting reserved_blocks from total bytes. Signed-off-by: Daeho Jeong Reviewed-by: Chao Yu Signed-off-by: Jaegeuk Kim Stable-dep-of: e462fc48ceb8 ("f2fs: maintain one time GC mode is enabled during whole zoned GC cycle") Signed-off-by: Sasha Levin

f2fs: add a sysfs entry to reclaim POSIX_FADV_NOREUSE pages

2025-12-18T12:55:15+00:00

[ Upstream commit a907f3a68ee26ba493a08a958809208d17f3347e ] 1. fadvise(fd1, POSIX_FADV_NOREUSE, {0,3}); 2. fadvise(fd2, POSIX_FADV_NOREUSE, {1,2}); 3. fadvise(fd3, POSIX_FADV_NOREUSE, {3,1}); 4. echo 1024 > /sys/fs/f2fs/tuning/reclaim_caches_kb This gives a way to reclaim file-backed pages by iterating all f2fs mounts until reclaiming 1MB page cache ranges, registered by #1, #2, and #3. 5. cat /sys/fs/f2fs/tuning/reclaim_caches_kb -> gives total number of registered file ranges. Reviewed-by: Chao Yu Signed-off-by: Jaegeuk Kim Stable-dep-of: e462fc48ceb8 ("f2fs: maintain one time GC mode is enabled during whole zoned GC cycle") Signed-off-by: Sasha Levin

x86/vmscape: Enable the mitigation

2025-09-11T15:21:46+00:00

Commit 556c1ad666ad90c50ec8fccb930dd5046cfbecfb upstream. Enable the previously added mitigation for VMscape. Add the cmdline vmscape={off|ibpb|force} and sysfs reporting. Signed-off-by: Pawan Gupta Signed-off-by: Dave Hansen Reviewed-by: Borislav Petkov (AMD) Reviewed-by: Dave Hansen Signed-off-by: Borislav Petkov (AMD) Signed-off-by: Greg Kroah-Hartman

x86/bugs: Add a Transient Scheduler Attacks mitigation

2025-07-10T14:05:14+00:00

Commit d8010d4ba43e9f790925375a7de100604a5e2dba upstream. Add the required features detection glue to bugs.c et all in order to support the TSA mitigation. Co-developed-by: Kim Phillips Signed-off-by: Kim Phillips Signed-off-by: Borislav Petkov (AMD) Reviewed-by: Pawan Gupta Signed-off-by: Greg Kroah-Hartman