fuse: Rename DIRECT_IO_RELAX to DIRECT_IO_ALLOW_MMAP

commit c55e0a55b165202f18cbc4a20650d2e1becd5507 upstream.

Although DIRECT_IO_RELAX's initial usage is to allow shared mmap, its
description indicates a purpose of reducing memory footprint. This
may imply that it could be further used to relax other DIRECT_IO
operations in the future.

Replace it with a flag DIRECT_IO_ALLOW_MMAP which does only one thing,
allow shared mmap of DIRECT_IO files while still bypassing the cache
on regular reads and writes.

[Miklos] Also Keep DIRECT_IO_RELAX definition for backward compatibility.

Signed-off-by: Tyler Fanelli <tfanelli@redhat.com>
Fixes: e78662e818f9 ("fuse: add a new fuse init flag to relax restrictions in no cache mode")
Cc: <stable@vger.kernel.org> # v6.6
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index 1cdb632..89e870d 100644 (file)
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -1448,7 +1448,7 @@ ssize_t fuse_direct_io(struct fuse_io_priv *io, struct iov_iter *iter,
        if (!ia)
                return -ENOMEM;
 
-       if (fopen_direct_io && fc->direct_io_relax) {
+       if (fopen_direct_io && fc->direct_io_allow_mmap) {
                res = filemap_write_and_wait_range(mapping, pos, pos + count - 1);
                if (res) {
                        fuse_io_free(ia);
@@ -2466,9 +2466,9 @@ static int fuse_file_mmap(struct file *file, struct vm_area_struct *vma)
 
        if (ff->open_flags & FOPEN_DIRECT_IO) {
                /* Can't provide the coherency needed for MAP_SHARED
-                * if FUSE_DIRECT_IO_RELAX isn't set.
+                * if FUSE_DIRECT_IO_ALLOW_MMAP isn't set.
                 */
-               if ((vma->vm_flags & VM_MAYSHARE) && !fc->direct_io_relax)
+               if ((vma->vm_flags & VM_MAYSHARE) && !fc->direct_io_allow_mmap)
                        return -ENODEV;
 
                invalidate_inode_pages2(file->f_mapping);

diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
index bf0b85d..405252b 100644 (file)
--- a/fs/fuse/fuse_i.h
+++ b/fs/fuse/fuse_i.h
@@ -797,8 +797,8 @@ struct fuse_conn {
        /* Is tmpfile not implemented by fs? */
        unsigned int no_tmpfile:1;
 
-       /* relax restrictions in FOPEN_DIRECT_IO mode */
-       unsigned int direct_io_relax:1;
+       /* Relax restrictions to allow shared mmap in FOPEN_DIRECT_IO mode */
+       unsigned int direct_io_allow_mmap:1;
 
        /* Is statx not implemented by fs? */
        unsigned int no_statx:1;

diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index 2e4eb7c..444418e 100644 (file)
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -1232,8 +1232,8 @@ static void process_init_reply(struct fuse_mount *fm, struct fuse_args *args,
                                fc->init_security = 1;
                        if (flags & FUSE_CREATE_SUPP_GROUP)
                                fc->create_supp_group = 1;
-                       if (flags & FUSE_DIRECT_IO_RELAX)
-                               fc->direct_io_relax = 1;
+                       if (flags & FUSE_DIRECT_IO_ALLOW_MMAP)
+                               fc->direct_io_allow_mmap = 1;
                } else {
                        ra_pages = fc->max_read / PAGE_SIZE;
                        fc->no_lock = 1;
@@ -1280,7 +1280,7 @@ void fuse_send_init(struct fuse_mount *fm)
                FUSE_NO_OPENDIR_SUPPORT | FUSE_EXPLICIT_INVAL_DATA |
                FUSE_HANDLE_KILLPRIV_V2 | FUSE_SETXATTR_EXT | FUSE_INIT_EXT |
                FUSE_SECURITY_CTX | FUSE_CREATE_SUPP_GROUP |
-               FUSE_HAS_EXPIRE_ONLY | FUSE_DIRECT_IO_RELAX;
+               FUSE_HAS_EXPIRE_ONLY | FUSE_DIRECT_IO_ALLOW_MMAP;
 #ifdef CONFIG_FUSE_DAX
        if (fm->fc->dax)
                flags |= FUSE_MAP_ALIGNMENT;

diff --git a/include/uapi/linux/fuse.h b/include/uapi/linux/fuse.h
index db92a72..e7418d1 100644 (file)
--- a/include/uapi/linux/fuse.h
+++ b/include/uapi/linux/fuse.h
@@ -209,7 +209,7 @@
  *  - add FUSE_HAS_EXPIRE_ONLY
  *
  *  7.39
- *  - add FUSE_DIRECT_IO_RELAX
+ *  - add FUSE_DIRECT_IO_ALLOW_MMAP
  *  - add FUSE_STATX and related structures
  */
 
@@ -409,8 +409,7 @@ struct fuse_file_lock {
  * FUSE_CREATE_SUPP_GROUP: add supplementary group info to create, mkdir,
  *                     symlink and mknod (single group that matches parent)
  * FUSE_HAS_EXPIRE_ONLY: kernel supports expiry-only entry invalidation
- * FUSE_DIRECT_IO_RELAX: relax restrictions in FOPEN_DIRECT_IO mode, for now
- *                       allow shared mmap
+ * FUSE_DIRECT_IO_ALLOW_MMAP: allow shared mmap in FOPEN_DIRECT_IO mode.
  */
 #define FUSE_ASYNC_READ                (1 << 0)
 #define FUSE_POSIX_LOCKS       (1 << 1)
@@ -449,7 +448,10 @@ struct fuse_file_lock {
 #define FUSE_HAS_INODE_DAX     (1ULL << 33)
 #define FUSE_CREATE_SUPP_GROUP (1ULL << 34)
 #define FUSE_HAS_EXPIRE_ONLY   (1ULL << 35)
-#define FUSE_DIRECT_IO_RELAX   (1ULL << 36)
+#define FUSE_DIRECT_IO_ALLOW_MMAP (1ULL << 36)
+
+/* Obsolete alias for FUSE_DIRECT_IO_ALLOW_MMAP */
+#define FUSE_DIRECT_IO_RELAX   FUSE_DIRECT_IO_ALLOW_MMAP
 
 /**
  * CUSE INIT request/reply flags