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authorLinus Torvalds <torvalds@linux-foundation.org>2024-03-11 19:38:17 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2024-03-11 19:38:17 +0300
commit7ea65c89d864f1e9aa892eec85625a96fa9acee6 (patch)
tree423ab3b73e04a64c37c830ceaa7d6a82748eadbf /Documentation/filesystems
parent97ec9715a84e6f0979242e1ea98b9af1a39acf3b (diff)
parent09406ad8e5105729291a7639160e0cd51c9e0c6c (diff)
downloadlinux-7ea65c89d864f1e9aa892eec85625a96fa9acee6.tar.xz
Merge tag 'vfs-6.9.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
Pull misc vfs updates from Christian Brauner: "Misc features, cleanups, and fixes for vfs and individual filesystems. Features: - Support idmapped mounts for hugetlbfs. - Add RWF_NOAPPEND flag for pwritev2(). This allows us to fix a bug where the passed offset is ignored if the file is O_APPEND. The new flag allows a caller to enforce that the offset is honored to conform to posix even if the file was opened in append mode. - Move i_mmap_rwsem in struct address_space to avoid false sharing between i_mmap and i_mmap_rwsem. - Convert efs, qnx4, and coda to use the new mount api. - Add a generic is_dot_dotdot() helper that's used by various filesystems and the VFS code instead of open-coding it multiple times. - Recently we've added stable offsets which allows stable ordering when iterating directories exported through NFS on e.g., tmpfs filesystems. Originally an xarray was used for the offset map but that caused slab fragmentation issues over time. This switches the offset map to the maple tree which has a dense mode that handles this scenario a lot better. Includes tests. - Finally merge the case-insensitive improvement series Gabriel has been working on for a long time. This cleanly propagates case insensitive operations through ->s_d_op which in turn allows us to remove the quite ugly generic_set_encrypted_ci_d_ops() operations. It also improves performance by trying a case-sensitive comparison first and then fallback to case-insensitive lookup if that fails. This also fixes a bug where overlayfs would be able to be mounted over a case insensitive directory which would lead to all sort of odd behaviors. Cleanups: - Make file_dentry() a simple accessor now that ->d_real() is simplified because of the backing file work we did the last two cycles. - Use the dedicated file_mnt_idmap helper in ntfs3. - Use smp_load_acquire/store_release() in the i_size_read/write helpers and thus remove the hack to handle i_size reads in the filemap code. - The SLAB_MEM_SPREAD is a nop now. Remove it from various places in fs/ - It's no longer necessary to perform a second built-in initramfs unpack call because we retain the contents of the previous extraction. Remove it. - Now that we have removed various allocators kfree_rcu() always works with kmem caches and kmalloc(). So simplify various places that only use an rcu callback in order to handle the kmem cache case. - Convert the pipe code to use a lockdep comparison function instead of open-coding the nesting making lockdep validation easier. - Move code into fs-writeback.c that was located in a header but can be made static as it's only used in that one file. - Rewrite the alignment checking iterators for iovec and bvec to be easier to read, and also significantly more compact in terms of generated code. This saves 270 bytes of text on x86-64 (with clang-18) and 224 bytes on arm64 (with gcc-13). In profiles it also saves a bit of time for the same workload. - Switch various places to use KMEM_CACHE instead of kmem_cache_create(). - Use inode_set_ctime_to_ts() in inode_set_ctime_current() - Use kzalloc() in name_to_handle_at() to avoid kernel infoleak. - Various smaller cleanups for eventfds. Fixes: - Fix various comments and typos, and unneeded initializations. - Fix stack allocation hack for clang in the select code. - Improve dump_mapping() debug code on a best-effort basis. - Fix build errors in various selftests. - Avoid wrap-around instrumentation in various places. - Don't allow user namespaces without an idmapping to be used for idmapped mounts. - Fix sysv sb_read() call. - Fix fallback implementation of the get_name() export operation" * tag 'vfs-6.9.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs: (70 commits) hugetlbfs: support idmapped mounts qnx4: convert qnx4 to use the new mount api fs: use inode_set_ctime_to_ts to set inode ctime to current time libfs: Drop generic_set_encrypted_ci_d_ops ubifs: Configure dentry operations at dentry-creation time f2fs: Configure dentry operations at dentry-creation time ext4: Configure dentry operations at dentry-creation time libfs: Add helper to choose dentry operations at mount-time libfs: Merge encrypted_ci_dentry_ops and ci_dentry_ops fscrypt: Drop d_revalidate once the key is added fscrypt: Drop d_revalidate for valid dentries during lookup fscrypt: Factor out a helper to configure the lookup dentry ovl: Always reject mounting over case-insensitive directories libfs: Attempt exact-match comparison first during casefolded lookup efs: remove SLAB_MEM_SPREAD flag usage jfs: remove SLAB_MEM_SPREAD flag usage minix: remove SLAB_MEM_SPREAD flag usage openpromfs: remove SLAB_MEM_SPREAD flag usage proc: remove SLAB_MEM_SPREAD flag usage qnx6: remove SLAB_MEM_SPREAD flag usage ...
Diffstat (limited to 'Documentation/filesystems')
-rw-r--r--Documentation/filesystems/files.rst2
-rw-r--r--Documentation/filesystems/locking.rst2
-rw-r--r--Documentation/filesystems/vfs.rst16
3 files changed, 9 insertions, 11 deletions
diff --git a/Documentation/filesystems/files.rst b/Documentation/filesystems/files.rst
index 9e38e4c221ca..eb770f891b27 100644
--- a/Documentation/filesystems/files.rst
+++ b/Documentation/filesystems/files.rst
@@ -116,7 +116,7 @@ before and after the reference count increment. This pattern can be seen
in get_file_rcu() and __files_get_rcu().
In addition, it isn't possible to access or check fields in struct file
-without first aqcuiring a reference on it under rcu lookup. Not doing
+without first acquiring a reference on it under rcu lookup. Not doing
that was always very dodgy and it was only usable for non-pointer data
in struct file. With SLAB_TYPESAFE_BY_RCU it is necessary that callers
either first acquire a reference or they must hold the files_lock of the
diff --git a/Documentation/filesystems/locking.rst b/Documentation/filesystems/locking.rst
index d5bf4b6b7509..e664061ed55d 100644
--- a/Documentation/filesystems/locking.rst
+++ b/Documentation/filesystems/locking.rst
@@ -29,7 +29,7 @@ prototypes::
char *(*d_dname)((struct dentry *dentry, char *buffer, int buflen);
struct vfsmount *(*d_automount)(struct path *path);
int (*d_manage)(const struct path *, bool);
- struct dentry *(*d_real)(struct dentry *, const struct inode *);
+ struct dentry *(*d_real)(struct dentry *, enum d_real_type type);
locking rules:
diff --git a/Documentation/filesystems/vfs.rst b/Documentation/filesystems/vfs.rst
index eebcc0f9e2bc..6e903a903f8f 100644
--- a/Documentation/filesystems/vfs.rst
+++ b/Documentation/filesystems/vfs.rst
@@ -1264,7 +1264,7 @@ defined:
char *(*d_dname)(struct dentry *, char *, int);
struct vfsmount *(*d_automount)(struct path *);
int (*d_manage)(const struct path *, bool);
- struct dentry *(*d_real)(struct dentry *, const struct inode *);
+ struct dentry *(*d_real)(struct dentry *, enum d_real_type type);
};
``d_revalidate``
@@ -1419,16 +1419,14 @@ defined:
the dentry being transited from.
``d_real``
- overlay/union type filesystems implement this method to return
- one of the underlying dentries hidden by the overlay. It is
- used in two different modes:
+ overlay/union type filesystems implement this method to return one
+ of the underlying dentries of a regular file hidden by the overlay.
- Called from file_dentry() it returns the real dentry matching
- the inode argument. The real dentry may be from a lower layer
- already copied up, but still referenced from the file. This
- mode is selected with a non-NULL inode argument.
+ The 'type' argument takes the values D_REAL_DATA or D_REAL_METADATA
+ for returning the real underlying dentry that refers to the inode
+ hosting the file's data or metadata respectively.
- With NULL inode the topmost real underlying dentry is returned.
+ For non-regular files, the 'dentry' argument is returned.
Each dentry has a pointer to its parent dentry, as well as a hash list
of child dentries. Child dentries are basically like files in a