diff options
| author | Pantelis Antoniou <pantelis.antoniou@konsulko.com> | 2015-10-22 23:30:04 +0300 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2016-01-04 12:31:46 +0100 |
| commit | 03607ace807b414eab46323c794b6fb8fcc2d48c (patch) | |
| tree | a192ae4376e5db9eb02e2563d3c12a7312e677ba /include/linux/configfs.h | |
| parent | 4ef7675344d687a0ef5b0d7c0cee12da005870c0 (diff) | |
configfs: implement binary attributes
ConfigFS lacked binary attributes up until now. This patch
introduces support for binary attributes in a somewhat similar
manner of sysfs binary attributes albeit with changes that
fit the configfs usage model.
Problems that configfs binary attributes fix are everything that
requires a binary blob as part of the configuration of a resource,
such as bitstream loading for FPGAs, DTBs for dynamically created
devices etc.
Look at Documentation/filesystems/configfs/configfs.txt for internals
and howto use them.
This patch is against linux-next as of today that contains
Christoph's configfs rework.
Signed-off-by: Pantelis Antoniou <pantelis.antoniou@konsulko.com>
[hch: folded a fix from Geert Uytterhoeven <geert+renesas@glider.be>]
[hch: a few tiny updates based on review feedback]
Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'include/linux/configfs.h')
| -rw-r--r-- | include/linux/configfs.h | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/include/linux/configfs.h b/include/linux/configfs.h index 758a029011b1..f7300d023dbe 100644 --- a/include/linux/configfs.h +++ b/include/linux/configfs.h @@ -51,6 +51,7 @@ struct module; struct configfs_item_operations; struct configfs_group_operations; struct configfs_attribute; +struct configfs_bin_attribute; struct configfs_subsystem; struct config_item { @@ -84,6 +85,7 @@ struct config_item_type { struct configfs_item_operations *ct_item_ops; struct configfs_group_operations *ct_group_ops; struct configfs_attribute **ct_attrs; + struct configfs_bin_attribute **ct_bin_attrs; }; /** @@ -154,6 +156,54 @@ static struct configfs_attribute _pfx##attr_##_name = { \ .store = _pfx##_name##_store, \ } +struct file; +struct vm_area_struct; + +struct configfs_bin_attribute { + struct configfs_attribute cb_attr; /* std. attribute */ + void *cb_private; /* for user */ + size_t cb_max_size; /* max core size */ + ssize_t (*read)(struct config_item *, void *, size_t); + ssize_t (*write)(struct config_item *, const void *, size_t); +}; + +#define CONFIGFS_BIN_ATTR(_pfx, _name, _priv, _maxsz) \ +static struct configfs_bin_attribute _pfx##attr_##_name = { \ + .cb_attr = { \ + .ca_name = __stringify(_name), \ + .ca_mode = S_IRUGO | S_IWUSR, \ + .ca_owner = THIS_MODULE, \ + }, \ + .cb_private = _priv, \ + .cb_max_size = _maxsz, \ + .read = _pfx##_name##_read, \ + .write = _pfx##_name##_write, \ +} + +#define CONFIGFS_BIN_ATTR_RO(_pfx, _name, _priv, _maxsz) \ +static struct configfs_attribute _pfx##attr_##_name = { \ + .cb_attr = { \ + .ca_name = __stringify(_name), \ + .ca_mode = S_IRUGO, \ + .ca_owner = THIS_MODULE, \ + }, \ + .cb_private = _priv, \ + .cb_max_size = _maxsz, \ + .read = _pfx##_name##_read, \ +} + +#define CONFIGFS_BIN_ATTR_WO(_pfx, _name, _priv, _maxsz) \ +static struct configfs_attribute _pfx##attr_##_name = { \ + .cb_attr = { \ + .ca_name = __stringify(_name), \ + .ca_mode = S_IWUSR, \ + .ca_owner = THIS_MODULE, \ + }, \ + .cb_private = _priv, \ + .cb_max_size = _maxsz, \ + .write = _pfx##_name##_write, \ +} + /* * If allow_link() exists, the item can symlink(2) out to other * items. If the item is a group, it may support mkdir(2). |