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descriptors: add fget_remote_foreach()

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(cherry picked from commit 4b69f1fab6)
This commit is contained in:
Konstantin Belousov 2025-03-18 04:10:03 +02:00
parent 451fca2e9f
commit e260058f33
2 changed files with 43 additions and 0 deletions
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41
sys/kern/kern_descrip.c
View file

@ -2995,6 +2995,47 @@ fget_remote(struct thread *td, struct proc *p, int fd, struct file **fpp)
return (error);
}
int
fget_remote_foreach(struct thread *td, struct proc *p,
int (*fn)(struct proc *, int, struct file *, void *), void *arg)
{
struct filedesc *fdp;
struct fdescenttbl *fdt;
struct file *fp;
int error, error1, fd, highfd;
error = 0;
PROC_LOCK(p);
fdp = fdhold(p);
PROC_UNLOCK(p);
if (fdp == NULL)
return (ENOENT);
FILEDESC_SLOCK(fdp);
if (refcount_load(&fdp->fd_refcnt) != 0) {
fdt = atomic_load_ptr(&fdp->fd_files);
highfd = fdt->fdt_nfiles - 1;
FILEDESC_SUNLOCK(fdp);
} else {
error = ENOENT;
FILEDESC_SUNLOCK(fdp);
goto out;
}
for (fd = 0; fd <= highfd; fd++) {
error1 = fget_remote(td, p, fd, &fp);
if (error1 != 0)
continue;
error = fn(p, fd, fp, arg);
fdrop(fp, td);
if (error != 0)
break;
}
out:
fddrop(fdp);
return (error);
}
#ifdef CAPABILITIES
int
fgetvp_lookup_smr(struct nameidata *ndp, struct vnode **vpp, bool *fsearch)

2
sys/sys/file.h
View file

@ -266,6 +266,8 @@ int fget_fcntl(struct thread *td, int fd, cap_rights_t *rightsp,
int needfcntl, struct file **fpp);
int _fdrop(struct file *fp, struct thread *td);
int fget_remote(struct thread *td, struct proc *p, int fd, struct file **fpp);
int fget_remote_foreach(struct thread *td, struct proc *p,
int (*fn)(struct proc *, int, struct file *, void *), void *arg);
fo_rdwr_t invfo_rdwr;
fo_truncate_t invfo_truncate;