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scoutfs: add setattr_more ioctl

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Add an ioctl that can be used by userspace to restore a file to its
offline state.  To do that it needs to set inode fields that are
otherwise not exposed and create an offline extent.

Signed-off-by: Zach Brown <zab@versity.com>
This commit is contained in:
Zach Brown
2019-05-30 13:45:52 -07:00
committed by Zach Brown
parent 0b6bc8789c
commit c010afa8ff
7 changed files with 185 additions and 0 deletions
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kmod/src/data.c
+43
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@@ -1239,6 +1239,49 @@ out:
return ret;
}
/*
* A special case of initialzing a single large offline extent. This
* chooses not to deal with any existing extents. It can only be used
* on regular files with no data extents. It's used to restore a file
* with an offline extent which can then trigger staging.
*
* The caller has taken care of locking and holding a transaction.
*
* This could be an fallocate mode.
*/
int scoutfs_data_init_offline_extent(struct inode *inode, u64 size,
struct scoutfs_lock *lock)
{
struct super_block *sb = inode->i_sb;
struct scoutfs_extent ext;
u64 ino = scoutfs_ino(inode);
u64 len;
int ret;
if (!S_ISREG(inode->i_mode)) {
ret = -EINVAL;
goto out;
}
scoutfs_extent_init(&ext, SCOUTFS_FILE_EXTENT_TYPE, ino, 0, 1, 0, 0);
ret = scoutfs_extent_next(sb, data_extent_io, &ext, lock);
if (ret != -ENOENT) {
if (ret == 0)
ret = -EINVAL;
goto out;
}
len = (size + SCOUTFS_BLOCK_SIZE - 1) >> SCOUTFS_BLOCK_SHIFT;
scoutfs_extent_init(&ext, SCOUTFS_FILE_EXTENT_TYPE, ino,
0, len, 0, SEF_OFFLINE);
ret = scoutfs_extent_add(sb, data_extent_io, &ext, lock);
if (ret == 0)
scoutfs_inode_add_onoff(inode, 0, len);
out:
return ret;
}
/*
* Return all the file's extents whose blocks overlap with the caller's