git: 168c7580c632 - main - file: add fo_cmp method
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Date: Wed, 24 Jan 2024 05:12:15 UTC
The branch main has been updated by kib: URL: https://cgit.FreeBSD.org/src/commit/?id=168c7580c6328342945db0e19a0791466bb07624 commit 168c7580c6328342945db0e19a0791466bb07624 Author: Konstantin Belousov <kib@FreeBSD.org> AuthorDate: 2024-01-19 21:01:35 +0000 Commit: Konstantin Belousov <kib@FreeBSD.org> CommitDate: 2024-01-24 05:11:26 +0000 file: add fo_cmp method The method should return 0 if the file' underlying objects are same. In other words, if 0 is returned, io from either of file causes modifications of the same object. Reviewed by: brooks, markj Sponsored by: The FreeBSD Foundation MFC after: 1 week Differential revision: https://reviews.freebsd.org/D43518 --- sys/sys/file.h | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/sys/sys/file.h b/sys/sys/file.h index 83da5105ad2b..80ed0e2db3bf 100644 --- a/sys/sys/file.h +++ b/sys/sys/file.h @@ -129,6 +129,7 @@ typedef int fo_fallocate_t(struct file *fp, off_t offset, off_t len, typedef int fo_fspacectl_t(struct file *fp, int cmd, off_t *offset, off_t *length, int flags, struct ucred *active_cred, struct thread *td); +typedef int fo_cmp_t(struct file *fp, struct file *fp1, struct thread *td); typedef int fo_spare_t(struct file *fp); typedef int fo_flags_t; @@ -152,6 +153,7 @@ struct fileops { fo_get_seals_t *fo_get_seals; fo_fallocate_t *fo_fallocate; fo_fspacectl_t *fo_fspacectl; + fo_cmp_t *fo_cmp; fo_spare_t *fo_spares[8]; /* Spare slots */ fo_flags_t fo_flags; /* DFLAG_* below */ }; @@ -491,6 +493,15 @@ fo_fspacectl(struct file *fp, int cmd, off_t *offset, off_t *length, active_cred, td)); } +static __inline int +fo_cmp(struct file *fp1, struct file *fp2, struct thread *td) +{ + + if (fp1->f_ops->fo_cmp == NULL) + return (ENODEV); + return ((*fp1->f_ops->fo_cmp)(fp1, fp2, td)); +} + #endif /* _KERNEL */ #endif /* !SYS_FILE_H */