forked from mirrors/linux
a1175d6b1b
The NFS server has a lot of special handling for different types of change attribute access, depending on the underlying filesystem. In most cases, it's doing a getattr anyway and then fetching that value after the fact. Rather that do that, add a new STATX_CHANGE_COOKIE flag that is a kernel-only symbol (for now). If requested and getattr can implement it, it can fill out this field. For IS_I_VERSION inodes, add a generic implementation in vfs_getattr_nosec. Take care to mask STATX_CHANGE_COOKIE off in requests from userland and in the result mask. Since not all filesystems can give the same guarantees of monotonicity, claim a STATX_ATTR_CHANGE_MONOTONIC flag that filesystems can set to indicate that they offer an i_version value that can never go backward. Eventually if we decide to make the i_version available to userland, we can just designate a field for it in struct statx, and move the STATX_CHANGE_COOKIE definition to the uapi header. Reviewed-by: NeilBrown <neilb@suse.de> Reviewed-by: Jan Kara <jack@suse.cz> Signed-off-by: Jeff Layton <jlayton@kernel.org>
66 lines
1.7 KiB
C
66 lines
1.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_STAT_H
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#define _LINUX_STAT_H
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#include <asm/stat.h>
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#include <uapi/linux/stat.h>
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#define S_IRWXUGO (S_IRWXU|S_IRWXG|S_IRWXO)
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#define S_IALLUGO (S_ISUID|S_ISGID|S_ISVTX|S_IRWXUGO)
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#define S_IRUGO (S_IRUSR|S_IRGRP|S_IROTH)
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#define S_IWUGO (S_IWUSR|S_IWGRP|S_IWOTH)
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#define S_IXUGO (S_IXUSR|S_IXGRP|S_IXOTH)
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#define UTIME_NOW ((1l << 30) - 1l)
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#define UTIME_OMIT ((1l << 30) - 2l)
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#include <linux/types.h>
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#include <linux/time.h>
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#include <linux/uidgid.h>
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struct kstat {
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u32 result_mask; /* What fields the user got */
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umode_t mode;
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unsigned int nlink;
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uint32_t blksize; /* Preferred I/O size */
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u64 attributes;
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u64 attributes_mask;
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#define KSTAT_ATTR_FS_IOC_FLAGS \
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(STATX_ATTR_COMPRESSED | \
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STATX_ATTR_IMMUTABLE | \
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STATX_ATTR_APPEND | \
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STATX_ATTR_NODUMP | \
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STATX_ATTR_ENCRYPTED | \
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STATX_ATTR_VERITY \
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)/* Attrs corresponding to FS_*_FL flags */
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#define KSTAT_ATTR_VFS_FLAGS \
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(STATX_ATTR_IMMUTABLE | \
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STATX_ATTR_APPEND \
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) /* Attrs corresponding to S_* flags that are enforced by the VFS */
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u64 ino;
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dev_t dev;
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dev_t rdev;
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kuid_t uid;
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kgid_t gid;
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loff_t size;
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struct timespec64 atime;
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struct timespec64 mtime;
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struct timespec64 ctime;
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struct timespec64 btime; /* File creation time */
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u64 blocks;
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u64 mnt_id;
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u32 dio_mem_align;
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u32 dio_offset_align;
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u64 change_cookie;
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};
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/* These definitions are internal to the kernel for now. Mainly used by nfsd. */
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/* mask values */
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#define STATX_CHANGE_COOKIE 0x40000000U /* Want/got stx_change_attr */
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/* file attribute values */
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#define STATX_ATTR_CHANGE_MONOTONIC 0x8000000000000000ULL /* version monotonically increases */
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#endif
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