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Add SCOUTFS_IOC_INJECT_TOTL_DELTA ioctl.

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Inject a signed (total, count) delta at a totl key.  No validity
checking.  Requires CAP_SYS_ADMIN.

Signed-off-by: Auke Kok <auke.kok@versity.com>
This commit is contained in:
Auke Kok
2026-04-30 16:14:37 -07:00
parent af31b9f1e8
commit 5aac1dd741
2 changed files with 52 additions and 0 deletions
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39
kmod/src/ioctl.c
View File

@@ -1739,6 +1739,43 @@ out:
return ret;
}
static long scoutfs_ioc_inject_totl_delta(struct file *file, unsigned long arg)
{
struct super_block *sb = file_inode(file)->i_sb;
struct scoutfs_ioctl_inject_totl_delta __user *uitd = (void __user *)arg;
struct scoutfs_ioctl_inject_totl_delta itd;
struct scoutfs_xattr_totl_val tval;
struct scoutfs_lock *lock = NULL;
struct scoutfs_key key;
int ret;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
if (copy_from_user(&itd, uitd, sizeof(itd)))
return -EFAULT;
scoutfs_xattr_init_totl_key(&key, itd.name);
tval.total = cpu_to_le64((u64)itd.total);
tval.count = cpu_to_le64((u64)itd.count);
ret = scoutfs_lock_xattr_totl(sb, SCOUTFS_LOCK_WRITE_ONLY, 0, &lock);
if (ret < 0)
goto out;
ret = scoutfs_hold_trans(sb, false);
if (ret < 0)
goto unlock;
ret = scoutfs_item_delta(sb, &key, &tval, sizeof(tval), lock);
scoutfs_release_trans(sb);
unlock:
scoutfs_unlock(sb, lock, SCOUTFS_LOCK_WRITE_ONLY);
out:
return ret;
}
long scoutfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
switch (cmd) {
@@ -1790,6 +1827,8 @@ long scoutfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
return scoutfs_ioc_read_xattr_index(file, arg);
case SCOUTFS_IOC_PUNCH_OFFLINE:
return scoutfs_ioc_punch_offline(file, arg);
case SCOUTFS_IOC_INJECT_TOTL_DELTA:
return scoutfs_ioc_inject_totl_delta(file, arg);
}
return -ENOTTY;

13
kmod/src/ioctl.h
View File

@@ -876,4 +876,17 @@ struct scoutfs_ioctl_punch_offline {
#define SCOUTFS_IOC_PUNCH_OFFLINE \
_IOW(SCOUTFS_IOCTL_MAGIC, 24, struct scoutfs_ioctl_punch_offline)
/*
* Inject a signed (total, count) delta at the totl key @name (a, b, c
* match the trailing dotted u64s of a totl xattr name).
*/
struct scoutfs_ioctl_inject_totl_delta {
__u64 name[SCOUTFS_IOCTL_XATTR_TOTAL_NAME_NR];
__s64 total;
__s64 count;
};
#define SCOUTFS_IOC_INJECT_TOTL_DELTA \
_IOW(SCOUTFS_IOCTL_MAGIC, 25, struct scoutfs_ioctl_inject_totl_delta)
#endif