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scoutfs: add statfs ioctl

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Add an ioctl that can fill a user struct with file system info.  We're
going to use this to find the fsid and rid of a mount.

Signed-off-by: Zach Brown <zab@versity.com>
This commit is contained in:
Zach Brown
2019-07-19 16:37:44 -07:00
committed by Zach Brown
parent 97f3971dcd
commit a7ce9f22e2
2 changed files with 45 additions and 0 deletions
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23
kmod/src/ioctl.c
View File

@@ -848,6 +848,27 @@ out:
return ret ?: total;
}
static long scoutfs_ioc_statfs_more(struct file *file, unsigned long arg)
{
struct super_block *sb = file_inode(file)->i_sb;
struct scoutfs_sb_info *sbi = SCOUTFS_SB(sb);
struct scoutfs_super_block *super = &sbi->super;
struct scoutfs_ioctl_statfs_more sfm;
if (get_user(sfm.valid_bytes, (__u64 __user *)arg))
return -EFAULT;
sfm.valid_bytes = min_t(u64, sfm.valid_bytes,
sizeof(struct scoutfs_ioctl_statfs_more));
sfm.fsid = le64_to_cpu(super->hdr.fsid);
sfm.rid = sbi->rid;
if (copy_to_user((void __user *)arg, &sfm, sfm.valid_bytes))
return -EFAULT;
return 0;
}
long scoutfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
switch (cmd) {
@@ -871,6 +892,8 @@ long scoutfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
return scoutfs_ioc_listxattr_hidden(file, arg);
case SCOUTFS_IOC_FIND_XATTRS:
return scoutfs_ioc_find_xattrs(file, arg);
case SCOUTFS_IOC_STATFS_MORE:
return scoutfs_ioc_statfs_more(file, arg);
}
return -ENOTTY;

22
kmod/src/ioctl.h
View File

@@ -347,4 +347,26 @@ struct scoutfs_ioctl_find_xattrs {
#define SCOUTFS_IOC_FIND_XATTRS _IOR(SCOUTFS_IOCTL_MAGIC, 10, \
struct scoutfs_ioctl_find_xattrs)
/*
* Give the user information about the filesystem.
*
* @valid_bytes stores the number of bytes that are valid in the
* structure. The caller sets this to the size of the struct that they
* understand. The kernel then fills and copies back the min of the
* size they and the user caller understand. The user can tell if a
* field is set if all of its bytes are within the valid_bytes that the
* kernel set on return.
*
* New fields are only added to the end of the struct.
*/
struct scoutfs_ioctl_statfs_more {
__u64 valid_bytes;
__u64 fsid;
__u64 rid;
} __packed;
#define SCOUTFS_IOC_STATFS_MORE _IOR(SCOUTFS_IOCTL_MAGIC, 11, \
struct scoutfs_ioctl_statfs_more)
#endif