kernel/linux.git/fs/f2fs/dir.c, branch linux-7.0.y

Merge tag 'vfs-7.0-rc1.misc.2' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs

2026-02-16T21:00:36+00:00

Pull more misc vfs updates from Christian Brauner: "Features: - Optimize close_range() from O(range size) to O(active FDs) by using find_next_bit() on the open_fds bitmap instead of linearly scanning the entire requested range. This is a significant improvement for large-range close operations on sparse file descriptor tables. - Add FS_XFLAG_VERITY file attribute for fs-verity files, retrievable via FS_IOC_FSGETXATTR and file_getattr(). The flag is read-only. Add tracepoints for fs-verity enable and verify operations, replacing the previously removed debug printk's. - Prevent nfsd from exporting special kernel filesystems like pidfs and nsfs. These filesystems have custom ->open() and ->permission() export methods that are designed for open_by_handle_at(2) only and are incompatible with nfsd. Update the exportfs documentation accordingly. Fixes: - Fix KMSAN uninit-value in ovl_fill_real() where strcmp() was used on a non-null-terminated decrypted directory entry name from fscrypt. This triggered on encrypted lower layers when the decrypted name buffer contained uninitialized tail data. The fix also adds VFS-level name_is_dot(), name_is_dotdot(), and name_is_dot_dotdot() helpers, replacing various open-coded "." and ".." checks across the tree. - Fix read-only fsflags not being reset together with xflags in vfs_fileattr_set(). Currently harmless since no read-only xflags overlap with flags, but this would cause inconsistencies for any future shared read-only flag - Return -EREMOTE instead of -ESRCH from PIDFD_GET_INFO when the target process is in a different pid namespace. This lets userspace distinguish "process exited" from "process in another namespace", matching glibc's pidfd_getpid() behavior Cleanups: - Use C-string literals in the Rust seq_file bindings, replacing the kernel::c_str!() macro (available since Rust 1.77) - Fix typo in d_walk_ret enum comment, add porting notes for the readlink_copy() calling convention change" * tag 'vfs-7.0-rc1.misc.2' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs: fs: add porting notes about readlink_copy() pidfs: return -EREMOTE when PIDFD_GET_INFO is called on another ns nfsd: do not allow exporting of special kernel filesystems exportfs: clarify the documentation of open()/permission() expotrfs ops fsverity: add tracepoints fs: add FS_XFLAG_VERITY for fs-verity files rust: seq_file: replace `kernel::c_str!` with C-Strings fs: dcache: fix typo in enum d_walk_ret comment ovl: use name_is_dot* helpers in readdir code fs: add helpers name_is_dot{,dot,_dotdot} ovl: Fix uninit-value in ovl_fill_real fs: reset read-only fsflags together with xflags fs/file: optimize close_range() complexity from O(N) to O(Sparse)

fs: add helpers name_is_dot{,dot,_dotdot}

2026-01-29T09:06:59+00:00

Rename the helper is_dot_dotdot() into the name_ namespace and add complementary helpers to check for dot and dotdot names individually. Signed-off-by: Amir Goldstein Link: https://patch.msgid.link/20260128132406.23768-3-amir73il@gmail.com Reviewed-by: Eric Biggers Signed-off-by: Christian Brauner

f2fs: add setlease file operation

2026-01-12T09:55:46+00:00

Add the setlease file_operation to f2fs_file_operations and f2fs_dir_operations, pointing to generic_setlease. A future patch will change the default behavior to reject lease attempts with -EINVAL when there is no setlease file operation defined. Add generic_setlease to retain the ability to set leases on this filesystem. Signed-off-by: Jeff Layton Link: https://patch.msgid.link/20260108-setlease-6-20-v1-8-ea4dec9b67fa@kernel.org Acked-by: Al Viro Acked-by: Christoph Hellwig Reviewed-by: Chao Yu Signed-off-by: Christian Brauner

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