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scoutfs: add alloc_detail ioctl

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An an ioctl which copies details of each persistent allocator to
userspace.  This will be used by a scoutfs command to give information
about the allocators in the system.

Signed-off-by: Zach Brown <zab@versity.com>
This commit is contained in:
Zach Brown
2020-10-12 10:48:05 -07:00
committed by Zach Brown
parent fb66372988
commit 3d790b24d5
2 changed files with 67 additions and 0 deletions
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50
kmod/src/ioctl.c
View File

@@ -36,6 +36,7 @@
#include "xattr.h"
#include "hash.h"
#include "srch.h"
#include "alloc.h"
#include "scoutfs_trace.h"
/*
@@ -867,6 +868,53 @@ static long scoutfs_ioc_statfs_more(struct file *file, unsigned long arg)
return 0;
}
struct copy_alloc_detail_args {
struct scoutfs_ioctl_alloc_detail_entry __user *uade;
u64 nr;
u64 copied;
};
static int copy_alloc_detail_to_user(struct super_block *sb, void *arg,
int owner, u64 id, bool meta, bool avail,
u64 blocks)
{
struct copy_alloc_detail_args *args = arg;
struct scoutfs_ioctl_alloc_detail_entry ade;
if (args->copied == args->nr)
return -EOVERFLOW;
ade.blocks = blocks;
ade.id = id;
ade.meta = !!meta;
ade.avail = !!avail;
if (copy_to_user(&args->uade[args->copied], &ade, sizeof(ade)))
return -EFAULT;
args->copied++;
return 0;
}
static long scoutfs_ioc_alloc_detail(struct file *file, unsigned long arg)
{
struct super_block *sb = file_inode(file)->i_sb;
struct scoutfs_ioctl_alloc_detail __user *uad = (void __user *)arg;
struct scoutfs_ioctl_alloc_detail ad;
struct copy_alloc_detail_args args;
if (copy_from_user(&ad, uad, sizeof(ad)))
return -EFAULT;
args.uade = (struct scoutfs_ioctl_alloc_detail_entry __user *)
(uintptr_t)ad.entries_ptr;
args.nr = ad.entries_nr;
args.copied = 0;
return scoutfs_alloc_foreach(sb, copy_alloc_detail_to_user, &args) ?:
args.copied;
}
long scoutfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
switch (cmd) {
@@ -892,6 +940,8 @@ long scoutfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
return scoutfs_ioc_statfs_more(file, arg);
case SCOUTFS_IOC_DATA_WAIT_ERR:
return scoutfs_ioc_data_wait_err(file, arg);
case SCOUTFS_IOC_ALLOC_DETAIL:
return scoutfs_ioc_alloc_detail(file, arg);
}
return -ENOTTY;

17
kmod/src/ioctl.h
View File

@@ -392,4 +392,21 @@ struct scoutfs_ioctl_data_wait_err {
#define SCOUTFS_IOC_DATA_WAIT_ERR _IOR(SCOUTFS_IOCTL_MAGIC, 11, \
struct scoutfs_ioctl_data_wait_err)
#define SCOUTFS_IOC_ALLOC_DETAIL _IOR(SCOUTFS_IOCTL_MAGIC, 12, \
struct scoutfs_ioctl_alloc_detail)
struct scoutfs_ioctl_alloc_detail {
__u64 entries_ptr;
__u64 entries_nr;
};
struct scoutfs_ioctl_alloc_detail_entry {
__u64 id;
__u64 blocks;
__u8 type;
__u8 meta:1,
avail:1;
};
#endif