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afs: Implement YFS ACL setting 

Implement the setting of YFS ACLs in AFS through the interface of setting
the afs.yfs.acl extended attribute on the file.

Signed-off-by: David Howells <dhowells@redhat.com>
This commit is contained in:
David Howells 2019-05-01 14:05:27 +01:00
parent ae46578b96
commit f5e4546347
3 changed files with 112 additions and 5 deletions
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1
fs/afs/internal.h
View File

@ -1383,6 +1383,7 @@ struct yfs_acl {
extern void yfs_free_opaque_acl(struct yfs_acl *);
extern struct yfs_acl *yfs_fs_fetch_opaque_acl(struct afs_fs_cursor *, unsigned int);
extern int yfs_fs_store_opaque_acl2(struct afs_fs_cursor *, const struct afs_acl *);
/*
* Miscellaneous inline functions.

49
fs/afs/xattr.c
View File

@ -226,9 +226,58 @@ static int afs_xattr_get_yfs(const struct xattr_handler *handler,
return ret;
}
/*
* Set a file's YFS ACL.
*/
static int afs_xattr_set_yfs(const struct xattr_handler *handler,
struct dentry *dentry,
struct inode *inode, const char *name,
const void *buffer, size_t size, int flags)
{
struct afs_fs_cursor fc;
struct afs_vnode *vnode = AFS_FS_I(inode);
struct afs_acl *acl = NULL;
struct key *key;
int ret;
if (flags == XATTR_CREATE ||
strcmp(name, "acl") != 0)
return -EINVAL;
key = afs_request_key(vnode->volume->cell);
if (IS_ERR(key))
return PTR_ERR(key);
acl = kmalloc(sizeof(*acl) + size, GFP_KERNEL);
if (!acl) {
key_put(key);
return -ENOMEM;
}
acl->size = size;
memcpy(acl->data, buffer, size);
ret = -ERESTARTSYS;
if (afs_begin_vnode_operation(&fc, vnode, key)) {
while (afs_select_fileserver(&fc)) {
fc.cb_break = afs_calc_vnode_cb_break(vnode);
yfs_fs_store_opaque_acl2(&fc, acl);
}
afs_check_for_remote_deletion(&fc, fc.vnode);
afs_vnode_commit_status(&fc, vnode, fc.cb_break);
ret = afs_end_vnode_operation(&fc);
}
kfree(acl);
key_put(key);
return ret;
}
static const struct xattr_handler afs_xattr_yfs_handler = {
.prefix = "afs.yfs.",
.get = afs_xattr_get_yfs,
.set = afs_xattr_set_yfs,
};
/*

67
fs/afs/yfsclient.c
View File

@ -1768,9 +1768,10 @@ int yfs_fs_get_volume_status(struct afs_fs_cursor *fc,
}
/*
* Deliver reply data to an YFS.SetLock, YFS.ExtendLock or YFS.ReleaseLock
* Deliver reply data to operations that just return a file status and a volume
* sync record.
*/
static int yfs_deliver_fs_xxxx_lock(struct afs_call *call)
static int yfs_deliver_status_and_volsync(struct afs_call *call)
{
struct afs_vnode *vnode = call->reply[0];
const __be32 *bp;
@ -1800,7 +1801,7 @@ static int yfs_deliver_fs_xxxx_lock(struct afs_call *call)
static const struct afs_call_type yfs_RXYFSSetLock = {
.name = "YFS.SetLock",
.op = yfs_FS_SetLock,
.deliver = yfs_deliver_fs_xxxx_lock,
.deliver = yfs_deliver_status_and_volsync,
.done = afs_lock_op_done,
.destructor = afs_flat_call_destructor,
};
@ -1811,7 +1812,7 @@ static const struct afs_call_type yfs_RXYFSSetLock = {
static const struct afs_call_type yfs_RXYFSExtendLock = {
.name = "YFS.ExtendLock",
.op = yfs_FS_ExtendLock,
.deliver = yfs_deliver_fs_xxxx_lock,
.deliver = yfs_deliver_status_and_volsync,
.done = afs_lock_op_done,
.destructor = afs_flat_call_destructor,
};
@ -1822,7 +1823,7 @@ static const struct afs_call_type yfs_RXYFSExtendLock = {
static const struct afs_call_type yfs_RXYFSReleaseLock = {
.name = "YFS.ReleaseLock",
.op = yfs_FS_ReleaseLock,
.deliver = yfs_deliver_fs_xxxx_lock,
.deliver = yfs_deliver_status_and_volsync,
.destructor = afs_flat_call_destructor,
};
@ -2392,3 +2393,59 @@ struct yfs_acl *yfs_fs_fetch_opaque_acl(struct afs_fs_cursor *fc,
fc->ac.error = -ENOMEM;
return ERR_PTR(-ENOMEM);
}
/*
* YFS.StoreOpaqueACL2 operation type
*/
static const struct afs_call_type yfs_RXYFSStoreOpaqueACL2 = {
.name = "YFS.StoreOpaqueACL2",
.op = yfs_FS_StoreOpaqueACL2,
.deliver = yfs_deliver_status_and_volsync,
.destructor = afs_flat_call_destructor,
};
/*
* Fetch the YFS ACL for a file.
*/
int yfs_fs_store_opaque_acl2(struct afs_fs_cursor *fc, const struct afs_acl *acl)
{
struct afs_vnode *vnode = fc->vnode;
struct afs_call *call;
struct afs_net *net = afs_v2net(vnode);
size_t size;
__be32 *bp;
_enter(",%x,{%llx:%llu},,",
key_serial(fc->key), vnode->fid.vid, vnode->fid.vnode);
size = round_up(acl->size, 4);
call = afs_alloc_flat_call(net, &yfs_RXYFSStoreStatus,
sizeof(__be32) * 2 +
sizeof(struct yfs_xdr_YFSFid) +
sizeof(__be32) + size,
sizeof(struct yfs_xdr_YFSFetchStatus) +
sizeof(struct yfs_xdr_YFSVolSync));
if (!call) {
fc->ac.error = -ENOMEM;
return -ENOMEM;
}
call->key = fc->key;
call->reply[0] = vnode;
call->reply[2] = NULL; /* volsync */
/* marshall the parameters */
bp = call->request;
bp = xdr_encode_u32(bp, YFSSTOREOPAQUEACL2);
bp = xdr_encode_u32(bp, 0); /* RPC flags */
bp = xdr_encode_YFSFid(bp, &vnode->fid);
bp = xdr_encode_u32(bp, acl->size);
memcpy(bp, acl->data, acl->size);
if (acl->size != size)
memset((void *)bp + acl->size, 0, size - acl->size);
yfs_check_req(call, bp);
trace_afs_make_fs_call(call, &vnode->fid);
afs_make_call(&fc->ac, call, GFP_KERNEL);
return afs_wait_for_call_to_complete(call, &fc->ac);
}