kernel/linux.git/fs/fuse/cuse.c, branch v6.19.12

fuse: allow synchronous FUSE_INIT

2025-09-02T09:14:15+00:00

FUSE_INIT has always been asynchronous with mount. That means that the server processed this request after the mount syscall returned. This means that FUSE_INIT can't supply the root inode's ID, hence it currently has a hardcoded value. There are other limitations such as not being able to perform getxattr during mount, which is needed by selinux. To remove these limitations allow server to process FUSE_INIT while initializing the in-core super block for the fuse filesystem. This can only be done if the server is prepared to handle this, so add FUSE_DEV_IOC_SYNC_INIT ioctl, which a) lets the server know whether this feature is supported, returning ENOTTY othewrwise. b) lets the kernel know to perform a synchronous initialization The implementation is slightly tricky, since fuse_dev/fuse_conn are set up only during super block creation. This is solved by setting the private data of the fuse device file to a special value ((struct fuse_dev *) 1) and waiting for this to be turned into a proper fuse_dev before commecing with operations on the device file. Signed-off-by: Miklos Szeredi

fuse: remove pages for requests and exclusively use folios

2024-11-05T13:08:35+00:00

All fuse requests use folios instead of pages for transferring data. Remove pages from the requests and exclusively use folios. No functional changes. [SzM: rename back folio_descs -> descs, etc.] Signed-off-by: Joanne Koong Reviewed-by: Josef Bacik Signed-off-by: Miklos Szeredi

fuse: convert cuse to use folios

2024-11-05T10:14:32+00:00

Convert cuse requests to use a folio instead of a page. No functional changes. Signed-off-by: Joanne Koong Reviewed-by: Josef Bacik Signed-off-by: Miklos Szeredi

cuse: add kernel-doc comments to cuse_process_init_reply()

2024-04-15T09:02:10+00:00

This commit adds kernel-doc style comments with complete parameter descriptions for the function cuse_process_init_reply. Signed-off-by: Yang Li Signed-off-by: Miklos Szeredi

fuse: fix UAF in rcu pathwalks

2024-02-25T07:10:32+00:00

->permission(), ->get_link() and ->inode_get_acl() might dereference ->s_fs_info (and, in case of ->permission(), ->s_fs_info->fc->user_ns as well) when called from rcu pathwalk. Freeing ->s_fs_info->fc is rcu-delayed; we need to make freeing ->s_fs_info and dropping ->user_ns rcu-delayed too. Signed-off-by: Al Viro

driver core: class: remove module * from class_create()

2023-03-17T14:16:33+00:00

The module pointer in class_create() never actually did anything, and it shouldn't have been requred to be set as a parameter even if it did something. So just remove it and fix up all callers of the function in the kernel tree at the same time. Cc: "Rafael J. Wysocki" Acked-by: Benjamin Tissoires Link: https://lore.kernel.org/r/20230313181843.1207845-4-gregkh@linuxfoundation.org Signed-off-by: Greg Kroah-Hartman

fuse: fix all W=1 kernel-doc warnings

2023-01-26T16:10:58+00:00

Use correct function name in kernel-doc notation. (1) Don't use "/**" to begin non-kernel-doc comments. (3) Fixes these warnings: fs/fuse/cuse.c:272: warning: expecting prototype for cuse_parse_dev_info(). Prototype was for cuse_parse_devinfo() instead fs/fuse/dev.c:212: warning: expecting prototype for A new request is available, wake fiq(). Prototype was for fuse_dev_wake_and_unlock() instead fs/fuse/dir.c:149: warning: This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst * Mark the attributes as stale due to an atime change. Avoid the invalidate if fs/fuse/file.c:656: warning: This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst * In case of short read, the caller sets 'pos' to the position of Signed-off-by: Randy Dunlap Signed-off-by: Miklos Szeredi

fuse: remove the unneeded result variable

2022-11-23T08:10:49+00:00

Return the value fuse_dev_release() directly instead of storing it in another redundant variable. Reported-by: Zeal Robot Signed-off-by: ye xingchen Signed-off-by: Miklos Szeredi

cuse: simplify refcount

2021-04-14T08:40:58+00:00

Put extra reference early in cuse_channel_open(). Signed-off-by: Miklos Szeredi

cuse: prevent clone

2021-04-14T08:40:58+00:00

For cloned connections cuse_channel_release() will be called more than once, resulting in use after free. Prevent device cloning for CUSE, which does not make sense at this point, and highly unlikely to be used in real life. Signed-off-by: Miklos Szeredi