kernel/linux.git/fs/f2fs/dir.c, branch v6.18.22

f2fs: add lookup_mode mount option

2025-08-11T17:03:27+00:00

For casefolded directories, f2fs may fall back to a linear search if a hash-based lookup fails. This can cause severe performance regressions. While this behavior can be controlled by userspace tools (e.g. mkfs, fsck) by setting an on-disk flag, a kernel-level solution is needed to guarantee the lookup behavior regardless of the on-disk state. This commit introduces the 'lookup_mode' mount option to provide this kernel-side control. The option accepts three values: - perf: (Default) Enforces a hash-only lookup. The linear fallback is always disabled. - compat: Enables the linear search fallback for compatibility with directory entries from older kernels. - auto: Determines the mode based on the on-disk flag, preserving the userspace-based behavior. Signed-off-by: Daniel Lee Reviewed-by: Chao Yu Signed-off-by: Jaegeuk Kim

f2fs: Remove clear_page_private_all()

2025-07-22T15:58:00+00:00

All callers can simply call folio_detach_private(). This was the only way that clear_page_private_data() could be called, so remove that too. Signed-off-by: Matthew Wilcox (Oracle) Reviewed-by: Chao Yu Signed-off-by: Jaegeuk Kim

f2fs: Pass a folio to F2FS_INODE()

2025-07-22T15:55:43+00:00

All callers now have a folio, so pass it in. Also make it const as F2FS_INODE() does not modify the struct folio passed in (the data it describes is mutable, but it does not change the contents of the struct). This may improve code generation. Signed-off-by: Matthew Wilcox (Oracle) Reviewed-by: Chao Yu Signed-off-by: Jaegeuk Kim

f2fs: Pass a folio to f2fs_update_inode()

2025-04-28T15:26:47+00:00

All callers now have a folio, so pass it in. Remove two calls to compound_head(). Signed-off-by: Matthew Wilcox (Oracle) Reviewed-by: Chao Yu Signed-off-by: Jaegeuk Kim

f2fs: Return a folio from f2fs_init_inode_metadata()

2025-04-28T15:26:46+00:00

Convert all three callers to handle a folio return. Remove three calls to compound_head(). Signed-off-by: Matthew Wilcox (Oracle) Reviewed-by: Chao Yu Signed-off-by: Jaegeuk Kim

f2fs: Pass a folio to f2fs_set_link()

2025-04-28T15:26:45+00:00

All callers now have a folio, pass it in. Removes four calls to compound_head(). Signed-off-by: Matthew Wilcox (Oracle) Reviewed-by: Chao Yu Signed-off-by: Jaegeuk Kim

f2fs: Pass a folio to inline_data_addr()

2025-04-28T15:26:45+00:00

All callers now have a folio, so pass it in. Signed-off-by: Matthew Wilcox (Oracle) Reviewed-by: Chao Yu Signed-off-by: Jaegeuk Kim

f2fs: Pass a folio to f2fs_delete_inline_entry()

2025-04-28T15:26:44+00:00

The caller now has a folio so pass it in. Removes four calls to compound_head(). Signed-off-by: Matthew Wilcox (Oracle) Reviewed-by: Chao Yu Signed-off-by: Jaegeuk Kim

f2fs: Pass a folio to f2fs_delete_entry()

2025-04-28T15:26:44+00:00

All callers now have a folio so pass it in. Removes eight calls to compound_head(). Signed-off-by: Matthew Wilcox (Oracle) Reviewed-by: Chao Yu Signed-off-by: Jaegeuk Kim

f2fs: Pass a folio to f2fs_parent_dir()

2025-04-28T15:26:44+00:00

Convert all the callers to pass a folio. Removes three calls to compound_head(). Signed-off-by: Matthew Wilcox (Oracle) Reviewed-by: Chao Yu Signed-off-by: Jaegeuk Kim