Re: [PATCH v6 6/6] fs: introduce file_getattr and file_setattr syscalls

From: Christian Brauner
Date: Tue Jul 01 2025 - 08:35:14 EST

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On Mon, Jun 30, 2025 at 06:20:16PM +0200, Andrey Albershteyn wrote:
> From: Andrey Albershteyn <aalbersh@xxxxxxxxxx>
>
> Introduce file_getattr() and file_setattr() syscalls to manipulate inode
> extended attributes. The syscalls takes pair of file descriptor and
> pathname. Then it operates on inode opened accroding to openat()
> semantics. The struct fsx_fileattr is passed to obtain/change extended
> attributes.
>
> This is an alternative to FS_IOC_FSSETXATTR ioctl with a difference
> that file don't need to be open as we can reference it with a path
> instead of fd. By having this we can manipulated inode extended
> attributes not only on regular files but also on special ones. This
> is not possible with FS_IOC_FSSETXATTR ioctl as with special files
> we can not call ioctl() directly on the filesystem inode using fd.
>
> This patch adds two new syscalls which allows userspace to get/set
> extended inode attributes on special files by using parent directory
> and a path - *at() like syscall.
>
> CC: linux-api@xxxxxxxxxxxxxxx
> CC: linux-fsdevel@xxxxxxxxxxxxxxx
> CC: linux-xfs@xxxxxxxxxxxxxxx
> Signed-off-by: Andrey Albershteyn <aalbersh@xxxxxxxxxx>
> Acked-by: Arnd Bergmann <arnd@xxxxxxxx>
> ---
> arch/alpha/kernel/syscalls/syscall.tbl | 2 +
> arch/arm/tools/syscall.tbl | 2 +
> arch/arm64/tools/syscall_32.tbl | 2 +
> arch/m68k/kernel/syscalls/syscall.tbl | 2 +
> arch/microblaze/kernel/syscalls/syscall.tbl | 2 +
> arch/mips/kernel/syscalls/syscall_n32.tbl | 2 +
> arch/mips/kernel/syscalls/syscall_n64.tbl | 2 +
> arch/mips/kernel/syscalls/syscall_o32.tbl | 2 +
> arch/parisc/kernel/syscalls/syscall.tbl | 2 +
> arch/powerpc/kernel/syscalls/syscall.tbl | 2 +
> arch/s390/kernel/syscalls/syscall.tbl | 2 +
> arch/sh/kernel/syscalls/syscall.tbl | 2 +
> arch/sparc/kernel/syscalls/syscall.tbl | 2 +
> arch/x86/entry/syscalls/syscall_32.tbl | 2 +
> arch/x86/entry/syscalls/syscall_64.tbl | 2 +
> arch/xtensa/kernel/syscalls/syscall.tbl | 2 +
> fs/file_attr.c | 148 ++++++++++++++++++++++++++++
> include/linux/syscalls.h | 6 ++
> include/uapi/asm-generic/unistd.h | 8 +-
> include/uapi/linux/fs.h | 18 ++++
> scripts/syscall.tbl | 2 +
> 21 files changed, 213 insertions(+), 1 deletion(-)
>
> diff --git a/arch/alpha/kernel/syscalls/syscall.tbl b/arch/alpha/kernel/syscalls/syscall.tbl
> index 2dd6340de6b4..16dca28ebf17 100644
> --- a/arch/alpha/kernel/syscalls/syscall.tbl
> +++ b/arch/alpha/kernel/syscalls/syscall.tbl
> @@ -507,3 +507,5 @@
> 575 common listxattrat sys_listxattrat
> 576 common removexattrat sys_removexattrat
> 577 common open_tree_attr sys_open_tree_attr
> +578 common file_getattr sys_file_getattr
> +579 common file_setattr sys_file_setattr
> diff --git a/arch/arm/tools/syscall.tbl b/arch/arm/tools/syscall.tbl
> index 27c1d5ebcd91..b07e699aaa3c 100644
> --- a/arch/arm/tools/syscall.tbl
> +++ b/arch/arm/tools/syscall.tbl
> @@ -482,3 +482,5 @@
> 465 common listxattrat sys_listxattrat
> 466 common removexattrat sys_removexattrat
> 467 common open_tree_attr sys_open_tree_attr
> +468 common file_getattr sys_file_getattr
> +469 common file_setattr sys_file_setattr
> diff --git a/arch/arm64/tools/syscall_32.tbl b/arch/arm64/tools/syscall_32.tbl
> index 0765b3a8d6d6..8d9088bc577d 100644
> --- a/arch/arm64/tools/syscall_32.tbl
> +++ b/arch/arm64/tools/syscall_32.tbl
> @@ -479,3 +479,5 @@
> 465 common listxattrat sys_listxattrat
> 466 common removexattrat sys_removexattrat
> 467 common open_tree_attr sys_open_tree_attr
> +468 common file_getattr sys_file_getattr
> +469 common file_setattr sys_file_setattr
> diff --git a/arch/m68k/kernel/syscalls/syscall.tbl b/arch/m68k/kernel/syscalls/syscall.tbl
> index 9fe47112c586..f41d38dfbf13 100644
> --- a/arch/m68k/kernel/syscalls/syscall.tbl
> +++ b/arch/m68k/kernel/syscalls/syscall.tbl
> @@ -467,3 +467,5 @@
> 465 common listxattrat sys_listxattrat
> 466 common removexattrat sys_removexattrat
> 467 common open_tree_attr sys_open_tree_attr
> +468 common file_getattr sys_file_getattr
> +469 common file_setattr sys_file_setattr
> diff --git a/arch/microblaze/kernel/syscalls/syscall.tbl b/arch/microblaze/kernel/syscalls/syscall.tbl
> index 7b6e97828e55..580af574fe73 100644
> --- a/arch/microblaze/kernel/syscalls/syscall.tbl
> +++ b/arch/microblaze/kernel/syscalls/syscall.tbl
> @@ -473,3 +473,5 @@
> 465 common listxattrat sys_listxattrat
> 466 common removexattrat sys_removexattrat
> 467 common open_tree_attr sys_open_tree_attr
> +468 common file_getattr sys_file_getattr
> +469 common file_setattr sys_file_setattr
> diff --git a/arch/mips/kernel/syscalls/syscall_n32.tbl b/arch/mips/kernel/syscalls/syscall_n32.tbl
> index aa70e371bb54..d824ffe9a014 100644
> --- a/arch/mips/kernel/syscalls/syscall_n32.tbl
> +++ b/arch/mips/kernel/syscalls/syscall_n32.tbl
> @@ -406,3 +406,5 @@
> 465 n32 listxattrat sys_listxattrat
> 466 n32 removexattrat sys_removexattrat
> 467 n32 open_tree_attr sys_open_tree_attr
> +468 n32 file_getattr sys_file_getattr
> +469 n32 file_setattr sys_file_setattr
> diff --git a/arch/mips/kernel/syscalls/syscall_n64.tbl b/arch/mips/kernel/syscalls/syscall_n64.tbl
> index 1e8c44c7b614..7a7049c2c307 100644
> --- a/arch/mips/kernel/syscalls/syscall_n64.tbl
> +++ b/arch/mips/kernel/syscalls/syscall_n64.tbl
> @@ -382,3 +382,5 @@
> 465 n64 listxattrat sys_listxattrat
> 466 n64 removexattrat sys_removexattrat
> 467 n64 open_tree_attr sys_open_tree_attr
> +468 n64 file_getattr sys_file_getattr
> +469 n64 file_setattr sys_file_setattr
> diff --git a/arch/mips/kernel/syscalls/syscall_o32.tbl b/arch/mips/kernel/syscalls/syscall_o32.tbl
> index 114a5a1a6230..d330274f0601 100644
> --- a/arch/mips/kernel/syscalls/syscall_o32.tbl
> +++ b/arch/mips/kernel/syscalls/syscall_o32.tbl
> @@ -455,3 +455,5 @@
> 465 o32 listxattrat sys_listxattrat
> 466 o32 removexattrat sys_removexattrat
> 467 o32 open_tree_attr sys_open_tree_attr
> +468 o32 file_getattr sys_file_getattr
> +469 o32 file_setattr sys_file_setattr
> diff --git a/arch/parisc/kernel/syscalls/syscall.tbl b/arch/parisc/kernel/syscalls/syscall.tbl
> index 94df3cb957e9..88a788a7b18d 100644
> --- a/arch/parisc/kernel/syscalls/syscall.tbl
> +++ b/arch/parisc/kernel/syscalls/syscall.tbl
> @@ -466,3 +466,5 @@
> 465 common listxattrat sys_listxattrat
> 466 common removexattrat sys_removexattrat
> 467 common open_tree_attr sys_open_tree_attr
> +468 common file_getattr sys_file_getattr
> +469 common file_setattr sys_file_setattr
> diff --git a/arch/powerpc/kernel/syscalls/syscall.tbl b/arch/powerpc/kernel/syscalls/syscall.tbl
> index 9a084bdb8926..b453e80dfc00 100644
> --- a/arch/powerpc/kernel/syscalls/syscall.tbl
> +++ b/arch/powerpc/kernel/syscalls/syscall.tbl
> @@ -558,3 +558,5 @@
> 465 common listxattrat sys_listxattrat
> 466 common removexattrat sys_removexattrat
> 467 common open_tree_attr sys_open_tree_attr
> +468 common file_getattr sys_file_getattr
> +469 common file_setattr sys_file_setattr
> diff --git a/arch/s390/kernel/syscalls/syscall.tbl b/arch/s390/kernel/syscalls/syscall.tbl
> index a4569b96ef06..8a6744d658db 100644
> --- a/arch/s390/kernel/syscalls/syscall.tbl
> +++ b/arch/s390/kernel/syscalls/syscall.tbl
> @@ -470,3 +470,5 @@
> 465 common listxattrat sys_listxattrat sys_listxattrat
> 466 common removexattrat sys_removexattrat sys_removexattrat
> 467 common open_tree_attr sys_open_tree_attr sys_open_tree_attr
> +468 common file_getattr sys_file_getattr sys_file_getattr
> +469 common file_setattr sys_file_setattr sys_file_setattr
> diff --git a/arch/sh/kernel/syscalls/syscall.tbl b/arch/sh/kernel/syscalls/syscall.tbl
> index 52a7652fcff6..5e9c9eff5539 100644
> --- a/arch/sh/kernel/syscalls/syscall.tbl
> +++ b/arch/sh/kernel/syscalls/syscall.tbl
> @@ -471,3 +471,5 @@
> 465 common listxattrat sys_listxattrat
> 466 common removexattrat sys_removexattrat
> 467 common open_tree_attr sys_open_tree_attr
> +468 common file_getattr sys_file_getattr
> +469 common file_setattr sys_file_setattr
> diff --git a/arch/sparc/kernel/syscalls/syscall.tbl b/arch/sparc/kernel/syscalls/syscall.tbl
> index 83e45eb6c095..ebb7d06d1044 100644
> --- a/arch/sparc/kernel/syscalls/syscall.tbl
> +++ b/arch/sparc/kernel/syscalls/syscall.tbl
> @@ -513,3 +513,5 @@
> 465 common listxattrat sys_listxattrat
> 466 common removexattrat sys_removexattrat
> 467 common open_tree_attr sys_open_tree_attr
> +468 common file_getattr sys_file_getattr
> +469 common file_setattr sys_file_setattr
> diff --git a/arch/x86/entry/syscalls/syscall_32.tbl b/arch/x86/entry/syscalls/syscall_32.tbl
> index ac007ea00979..4877e16da69a 100644
> --- a/arch/x86/entry/syscalls/syscall_32.tbl
> +++ b/arch/x86/entry/syscalls/syscall_32.tbl
> @@ -473,3 +473,5 @@
> 465 i386 listxattrat sys_listxattrat
> 466 i386 removexattrat sys_removexattrat
> 467 i386 open_tree_attr sys_open_tree_attr
> +468 i386 file_getattr sys_file_getattr
> +469 i386 file_setattr sys_file_setattr
> diff --git a/arch/x86/entry/syscalls/syscall_64.tbl b/arch/x86/entry/syscalls/syscall_64.tbl
> index cfb5ca41e30d..92cf0fe2291e 100644
> --- a/arch/x86/entry/syscalls/syscall_64.tbl
> +++ b/arch/x86/entry/syscalls/syscall_64.tbl
> @@ -391,6 +391,8 @@
> 465 common listxattrat sys_listxattrat
> 466 common removexattrat sys_removexattrat
> 467 common open_tree_attr sys_open_tree_attr
> +468 common file_getattr sys_file_getattr
> +469 common file_setattr sys_file_setattr
>
> #
> # Due to a historical design error, certain syscalls are numbered differently
> diff --git a/arch/xtensa/kernel/syscalls/syscall.tbl b/arch/xtensa/kernel/syscalls/syscall.tbl
> index f657a77314f8..374e4cb788d8 100644
> --- a/arch/xtensa/kernel/syscalls/syscall.tbl
> +++ b/arch/xtensa/kernel/syscalls/syscall.tbl
> @@ -438,3 +438,5 @@
> 465 common listxattrat sys_listxattrat
> 466 common removexattrat sys_removexattrat
> 467 common open_tree_attr sys_open_tree_attr
> +468 common file_getattr sys_file_getattr
> +469 common file_setattr sys_file_setattr
> diff --git a/fs/file_attr.c b/fs/file_attr.c
> index 62f08872d4ad..fda9d847eee5 100644
> --- a/fs/file_attr.c
> +++ b/fs/file_attr.c
> @@ -3,6 +3,10 @@
> #include <linux/security.h>
> #include <linux/fscrypt.h>
> #include <linux/fileattr.h>
> +#include <linux/syscalls.h>
> +#include <linux/namei.h>
> +
> +#include "internal.h"
>
> /**
> * fileattr_fill_xflags - initialize fileattr with xflags
> @@ -89,6 +93,19 @@ int vfs_fileattr_get(struct dentry *dentry, struct fileattr *fa)
> }
> EXPORT_SYMBOL(vfs_fileattr_get);
>
> +static void fileattr_to_fsx_fileattr(const struct fileattr *fa,
> + struct fsx_fileattr *fsx)
> +{
> + __u32 mask = FS_XFLAGS_MASK;
> +
> + memset(fsx, 0, sizeof(struct fsx_fileattr));

Fwiw, what also works is:

*fsx = (struct fsx_fileattr){
.fsx_xflags = fa->fsx_xflags & mask,
.fsx_extsize = fa->fsx_extsize,
.fsx_nextents = fa->fsx_nextents,
.fsx_projid = fa->fsx_projid,
.fsx_cowextsize = fa->fsx_cowextsize,
}

avoiding the memset(). Anyway, all minor nits.

> + fsx->fsx_xflags = fa->fsx_xflags & mask;
> + fsx->fsx_extsize = fa->fsx_extsize;
> + fsx->fsx_nextents = fa->fsx_nextents;
> + fsx->fsx_projid = fa->fsx_projid;
> + fsx->fsx_cowextsize = fa->fsx_cowextsize;
> +}
> +
> /**
> * copy_fsxattr_to_user - copy fsxattr to userspace.
> * @fa: fileattr pointer
> @@ -115,6 +132,23 @@ int copy_fsxattr_to_user(const struct fileattr *fa, struct fsxattr __user *ufa)
> }
> EXPORT_SYMBOL(copy_fsxattr_to_user);
>
> +static int fsx_fileattr_to_fileattr(const struct fsx_fileattr *fsx,
> + struct fileattr *fa)
> +{
> + __u32 mask = FS_XFLAGS_MASK;
> +
> + if (fsx->fsx_xflags & ~mask)
> + return -EINVAL;
> +
> + fileattr_fill_xflags(fa, fsx->fsx_xflags);
> + fa->fsx_xflags &= ~FS_XFLAG_RDONLY_MASK;
> + fa->fsx_extsize = fsx->fsx_extsize;
> + fa->fsx_projid = fsx->fsx_projid;
> + fa->fsx_cowextsize = fsx->fsx_cowextsize;
> +
> + return 0;
> +}
> +
> static int copy_fsxattr_from_user(struct fileattr *fa,
> struct fsxattr __user *ufa)
> {
> @@ -343,3 +377,117 @@ int ioctl_fssetxattr(struct file *file, void __user *argp)
> return err;
> }
> EXPORT_SYMBOL(ioctl_fssetxattr);
> +
> +SYSCALL_DEFINE5(file_getattr, int, dfd, const char __user *, filename,
> + struct fsx_fileattr __user *, ufsx, size_t, usize,
> + unsigned int, at_flags)
> +{
> + struct fileattr fa;
> + struct path filepath __free(path_put) = {};
> + int error;
> + unsigned int lookup_flags = 0;
> + struct filename *name __free(putname) = NULL;

Fwiw, cleanup guards should always be grouped together at the top like:

struct path filepath __free(path_put) = {};
struct filename *name __free(putname) = NULL;
struct fileattr fa;
int error;
unsigned int lookup_flags = 0;

This makes it easy to spot them when reading a function with multiple
variables on top.

> + struct fsx_fileattr fsx;

> + struct fsx_fileattr fsx;
> +
> + BUILD_BUG_ON(sizeof(struct fsx_fileattr) < FSX_FILEATTR_SIZE_VER0);
> + BUILD_BUG_ON(sizeof(struct fsx_fileattr) != FSX_FILEATTR_SIZE_LATEST);
> +
> + if ((at_flags & ~(AT_SYMLINK_NOFOLLOW | AT_EMPTY_PATH)) != 0)
> + return -EINVAL;
> +
> + if (!(at_flags & AT_SYMLINK_NOFOLLOW))
> + lookup_flags |= LOOKUP_FOLLOW;
> +
> + if (usize > PAGE_SIZE)
> + return -E2BIG;
> +
> + if (usize < FSX_FILEATTR_SIZE_VER0)
> + return -EINVAL;
> +
> + name = getname_maybe_null(filename, at_flags);
> + if (IS_ERR(name))
> + return PTR_ERR(name);
> +
> + if (!name && dfd >= 0) {
> + CLASS(fd, f)(dfd);
> +
> + filepath = fd_file(f)->f_path;
> + path_get(&filepath);
> + } else {
> + error = filename_lookup(dfd, name, lookup_flags, &filepath,
> + NULL);
> + if (error)
> + return error;
> + }
> +
> + error = vfs_fileattr_get(filepath.dentry, &fa);
> + if (error)
> + return error;
> +
> + fileattr_to_fsx_fileattr(&fa, &fsx);
> + error = copy_struct_to_user(ufsx, usize, &fsx,
> + sizeof(struct fsx_fileattr), NULL);
> +
> + return error;
> +}
> +
> +SYSCALL_DEFINE5(file_setattr, int, dfd, const char __user *, filename,
> + struct fsx_fileattr __user *, ufsx, size_t, usize,
> + unsigned int, at_flags)
> +{
> + struct fileattr fa;
> + struct path filepath __free(path_put) = {};
> + int error;
> + unsigned int lookup_flags = 0;
> + struct filename *name __free(putname) = NULL;
> + struct fsx_fileattr fsx;
> +
> + BUILD_BUG_ON(sizeof(struct fsx_fileattr) < FSX_FILEATTR_SIZE_VER0);
> + BUILD_BUG_ON(sizeof(struct fsx_fileattr) != FSX_FILEATTR_SIZE_LATEST);
> +
> + if ((at_flags & ~(AT_SYMLINK_NOFOLLOW | AT_EMPTY_PATH)) != 0)
> + return -EINVAL;
> +
> + if (!(at_flags & AT_SYMLINK_NOFOLLOW))
> + lookup_flags |= LOOKUP_FOLLOW;
> +
> + if (usize > PAGE_SIZE)
> + return -E2BIG;
> +
> + if (usize < FSX_FILEATTR_SIZE_VER0)
> + return -EINVAL;
> +
> + error = copy_struct_from_user(&fsx, sizeof(struct fsx_fileattr), ufsx,
> + usize);
> + if (error)
> + return error;
> +
> + error = fsx_fileattr_to_fileattr(&fsx, &fa);
> + if (error)
> + return error;
> +
> + name = getname_maybe_null(filename, at_flags);
> + if (IS_ERR(name))
> + return PTR_ERR(name);
> +
> + if (!name && dfd >= 0) {
> + CLASS(fd, f)(dfd);
> +
> + filepath = fd_file(f)->f_path;
> + path_get(&filepath);
> + } else {
> + error = filename_lookup(dfd, name, lookup_flags, &filepath,
> + NULL);
> + if (error)
> + return error;
> + }
> +
> + error = mnt_want_write(filepath.mnt);
> + if (!error) {
> + error = vfs_fileattr_set(mnt_idmap(filepath.mnt),
> + filepath.dentry, &fa);
> + mnt_drop_write(filepath.mnt);
> + }

Note-to-self: I really want scoped_guard()s for mnt_want_write() going forward...

> +
> + return error;
> +}
> diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
> index e5603cc91963..179acbe28fec 100644
> --- a/include/linux/syscalls.h
> +++ b/include/linux/syscalls.h
> @@ -371,6 +371,12 @@ asmlinkage long sys_removexattrat(int dfd, const char __user *path,
> asmlinkage long sys_lremovexattr(const char __user *path,
> const char __user *name);
> asmlinkage long sys_fremovexattr(int fd, const char __user *name);
> +asmlinkage long sys_file_getattr(int dfd, const char __user *filename,
> + struct fsx_fileattr __user *ufsx, size_t usize,
> + unsigned int at_flags);
> +asmlinkage long sys_file_setattr(int dfd, const char __user *filename,
> + struct fsx_fileattr __user *ufsx, size_t usize,
> + unsigned int at_flags);
> asmlinkage long sys_getcwd(char __user *buf, unsigned long size);
> asmlinkage long sys_eventfd2(unsigned int count, int flags);
> asmlinkage long sys_epoll_create1(int flags);
> diff --git a/include/uapi/asm-generic/unistd.h b/include/uapi/asm-generic/unistd.h
> index 2892a45023af..04e0077fb4c9 100644
> --- a/include/uapi/asm-generic/unistd.h
> +++ b/include/uapi/asm-generic/unistd.h
> @@ -852,8 +852,14 @@ __SYSCALL(__NR_removexattrat, sys_removexattrat)
> #define __NR_open_tree_attr 467
> __SYSCALL(__NR_open_tree_attr, sys_open_tree_attr)
>
> +/* fs/inode.c */
> +#define __NR_file_getattr 468
> +__SYSCALL(__NR_file_getattr, sys_file_getattr)
> +#define __NR_file_setattr 469
> +__SYSCALL(__NR_file_setattr, sys_file_setattr)
> +
> #undef __NR_syscalls
> -#define __NR_syscalls 468
> +#define __NR_syscalls 470
>
> /*
> * 32 bit systems traditionally used different
> diff --git a/include/uapi/linux/fs.h b/include/uapi/linux/fs.h
> index 0098b0ce8ccb..0784f2033ba4 100644
> --- a/include/uapi/linux/fs.h
> +++ b/include/uapi/linux/fs.h
> @@ -148,6 +148,24 @@ struct fsxattr {
> unsigned char fsx_pad[8];
> };
>
> +/*
> + * Variable size structure for file_[sg]et_attr().
> + *
> + * Note. This is alternative to the structure 'struct fileattr'/'struct fsxattr'.
> + * As this structure is passed to/from userspace with its size, this can
> + * be versioned based on the size.
> + */
> +struct fsx_fileattr {
> + __u32 fsx_xflags; /* xflags field value (get/set) */
> + __u32 fsx_extsize; /* extsize field value (get/set)*/
> + __u32 fsx_nextents; /* nextents field value (get) */
> + __u32 fsx_projid; /* project identifier (get/set) */
> + __u32 fsx_cowextsize; /* CoW extsize field value (get/set) */

This misses a:

__u32 __spare;

so there's no holes in the struct. :)

> +};
> +
> +#define FSX_FILEATTR_SIZE_VER0 20
> +#define FSX_FILEATTR_SIZE_LATEST FSX_FILEATTR_SIZE_VER0
> +
> /*
> * Flags for the fsx_xflags field
> */
> diff --git a/scripts/syscall.tbl b/scripts/syscall.tbl
> index 580b4e246aec..d1ae5e92c615 100644
> --- a/scripts/syscall.tbl
> +++ b/scripts/syscall.tbl
> @@ -408,3 +408,5 @@
> 465 common listxattrat sys_listxattrat
> 466 common removexattrat sys_removexattrat
> 467 common open_tree_attr sys_open_tree_attr
> +468 common file_getattr sys_file_getattr
> +469 common file_setattr sys_file_setattr
>
> --
> 2.47.2
>

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