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afs: implement acl setting

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Implements the setting of ACLs in AFS by means of setting the
afs.acl extended attribute on the file.

Signed-off-by: Joe Gorse <jhgorse@gmail.com>
Signed-off-by: David Howells <dhowells@redhat.com>
This commit is contained in:
Joe Gorse 2019-04-25 14:26:52 +01:00 committed by David Howells
parent 260f082bae
commit b10494af49
5 changed files with 110 additions and 6 deletions
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1
fs/afs/afs_fs.h
View File

@ -20,6 +20,7 @@ enum AFS_FS_Operations {
FSFETCHACL = 131, /* AFS Fetch file ACL */
FSFETCHSTATUS = 132, /* AFS Fetch file status */
FSSTOREDATA = 133, /* AFS Store file data */
FSSTOREACL = 134, /* AFS Store file ACL */
FSSTORESTATUS = 135, /* AFS Store file status */
FSREMOVEFILE = 136, /* AFS Remove a file */
FSCREATEFILE = 137, /* AFS Create a file */

61
fs/afs/fsclient.c
View File

@ -836,9 +836,10 @@ int afs_fs_create(struct afs_fs_cursor *fc,
}
/*
* deliver reply data to an FS.RemoveFile or FS.RemoveDir
* Deliver reply data to any operation that returns file status and volume
* sync.
*/
static int afs_deliver_fs_remove(struct afs_call *call)
static int afs_deliver_fs_status_and_vol(struct afs_call *call)
{
struct afs_vnode *vnode = call->reply[0];
const __be32 *bp;
@ -868,14 +869,14 @@ static int afs_deliver_fs_remove(struct afs_call *call)
static const struct afs_call_type afs_RXFSRemoveFile = {
.name = "FS.RemoveFile",
.op = afs_FS_RemoveFile,
.deliver = afs_deliver_fs_remove,
.deliver = afs_deliver_fs_status_and_vol,
.destructor = afs_flat_call_destructor,
};
static const struct afs_call_type afs_RXFSRemoveDir = {
.name = "FS.RemoveDir",
.op = afs_FS_RemoveDir,
.deliver = afs_deliver_fs_remove,
.deliver = afs_deliver_fs_status_and_vol,
.destructor = afs_flat_call_destructor,
};
@ -2513,3 +2514,55 @@ struct afs_acl *afs_fs_fetch_acl(struct afs_fs_cursor *fc)
afs_make_call(&fc->ac, call, GFP_KERNEL);
return (struct afs_acl *)afs_wait_for_call_to_complete(call, &fc->ac);
}
/*
* FS.StoreACL operation type
*/
static const struct afs_call_type afs_RXFSStoreACL = {
.name = "FS.StoreACL",
.op = afs_FS_StoreACL,
.deliver = afs_deliver_fs_status_and_vol,
.destructor = afs_flat_call_destructor,
};
/*
* Fetch the ACL for a file.
*/
int afs_fs_store_acl(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, &afs_RXFSStoreACL,
5 * 4 + size, (21 + 6) * 4);
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[0] = htonl(FSSTOREACL);
bp[1] = htonl(vnode->fid.vid);
bp[2] = htonl(vnode->fid.vnode);
bp[3] = htonl(vnode->fid.unique);
bp[4] = htonl(acl->size);
memcpy(&bp[5], acl->data, acl->size);
if (acl->size != size)
memset((void *)&bp[5] + acl->size, 0, size - acl->size);
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);
}

1
fs/afs/internal.h
View File

@ -983,6 +983,7 @@ struct afs_acl {
};
extern struct afs_acl *afs_fs_fetch_acl(struct afs_fs_cursor *);
extern int afs_fs_store_acl(struct afs_fs_cursor *, const struct afs_acl *);
/*
* fs_probe.c

52
fs/afs/xattr.c
View File

@ -80,9 +80,57 @@ static int afs_xattr_get_acl(const struct xattr_handler *handler,
return ret;
}
/*
* Set a file's AFS3 ACL.
*/
static int afs_xattr_set_acl(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)
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);
afs_fs_store_acl(&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_afs_acl_handler = {
.name = "afs.acl",
.get = afs_xattr_get_acl,
.name = "afs.acl",
.get = afs_xattr_get_acl,
.set = afs_xattr_set_acl,
};
/*

1
include/trace/events/afs.h
View File

@ -36,6 +36,7 @@ enum afs_fs_operation {
afs_FS_FetchACL = 131, /* AFS Fetch file ACL */
afs_FS_FetchStatus = 132, /* AFS Fetch file status */
afs_FS_StoreData = 133, /* AFS Store file data */
afs_FS_StoreACL = 134, /* AFS Store file ACL */
afs_FS_StoreStatus = 135, /* AFS Store file status */
afs_FS_RemoveFile = 136, /* AFS Remove a file */
afs_FS_CreateFile = 137, /* AFS Create a file */