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https://github.com/torvalds/linux.git
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AFS: write support fixes
AFS write support fixes:
(1) Support large files using the 64-bit file access operations if available
on the server.
(2) Use kmap_atomic() rather than kmap() in afs_prepare_page().
(3) Don't do stuff in afs_writepage() that's done by the caller.
[akpm@linux-foundation.org: fix right shift count >= width of type]
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
David Howells
Linus Torvalds
parent
218e180e7e
commit
b9b1f8d593
3 changed files with 216 additions and 17 deletions
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@ -31,6 +31,8 @@ enum AFS_FS_Operations {
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FSGETVOLUMEINFO = 148, /* AFS Get root volume information */
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FSGETROOTVOLUME = 151, /* AFS Get root volume name */
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FSLOOKUP = 161, /* AFS lookup file in directory */
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FSFETCHDATA64 = 65537, /* AFS Fetch file data */
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FSSTOREDATA64 = 65538, /* AFS Store file data */
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};
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enum AFS_FS_Errors {
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@ -293,9 +293,33 @@ static int afs_deliver_fs_fetch_data(struct afs_call *call,
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case 0:
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call->offset = 0;
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call->unmarshall++;
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if (call->operation_ID != FSFETCHDATA64) {
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call->unmarshall++;
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goto no_msw;
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}
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/* extract the returned data length */
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/* extract the upper part of the returned data length of an
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* FSFETCHDATA64 op (which should always be 0 using this
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* client) */
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case 1:
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_debug("extract data length (MSW)");
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ret = afs_extract_data(call, skb, last, &call->tmp, 4);
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switch (ret) {
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case 0: break;
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case -EAGAIN: return 0;
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default: return ret;
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}
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call->count = ntohl(call->tmp);
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_debug("DATA length MSW: %u", call->count);
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if (call->count > 0)
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return -EBADMSG;
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call->offset = 0;
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call->unmarshall++;
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no_msw:
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/* extract the returned data length */
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case 2:
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_debug("extract data length");
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ret = afs_extract_data(call, skb, last, &call->tmp, 4);
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switch (ret) {
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@ -312,7 +336,7 @@ static int afs_deliver_fs_fetch_data(struct afs_call *call,
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call->unmarshall++;
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/* extract the returned data */
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case 2:
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case 3:
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_debug("extract data");
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if (call->count > 0) {
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page = call->reply3;
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@ -331,7 +355,7 @@ static int afs_deliver_fs_fetch_data(struct afs_call *call,
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call->unmarshall++;
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/* extract the metadata */
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case 3:
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case 4:
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ret = afs_extract_data(call, skb, last, call->buffer,
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(21 + 3 + 6) * 4);
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switch (ret) {
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@ -349,7 +373,7 @@ static int afs_deliver_fs_fetch_data(struct afs_call *call,
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call->offset = 0;
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call->unmarshall++;
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case 4:
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case 5:
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_debug("trailer");
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if (skb->len != 0)
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return -EBADMSG;
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@ -381,6 +405,56 @@ static const struct afs_call_type afs_RXFSFetchData = {
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.destructor = afs_flat_call_destructor,
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};
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static const struct afs_call_type afs_RXFSFetchData64 = {
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.name = "FS.FetchData64",
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.deliver = afs_deliver_fs_fetch_data,
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.abort_to_error = afs_abort_to_error,
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.destructor = afs_flat_call_destructor,
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};
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/*
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* fetch data from a very large file
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*/
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static int afs_fs_fetch_data64(struct afs_server *server,
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struct key *key,
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struct afs_vnode *vnode,
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off_t offset, size_t length,
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struct page *buffer,
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const struct afs_wait_mode *wait_mode)
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{
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struct afs_call *call;
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__be32 *bp;
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_enter("");
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ASSERTCMP(length, <, ULONG_MAX);
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call = afs_alloc_flat_call(&afs_RXFSFetchData64, 32, (21 + 3 + 6) * 4);
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if (!call)
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return -ENOMEM;
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call->key = key;
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call->reply = vnode;
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call->reply2 = NULL; /* volsync */
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call->reply3 = buffer;
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call->service_id = FS_SERVICE;
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call->port = htons(AFS_FS_PORT);
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call->operation_ID = FSFETCHDATA64;
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/* marshall the parameters */
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bp = call->request;
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bp[0] = htonl(FSFETCHDATA64);
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bp[1] = htonl(vnode->fid.vid);
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bp[2] = htonl(vnode->fid.vnode);
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bp[3] = htonl(vnode->fid.unique);
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bp[4] = htonl(upper_32_bits(offset));
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bp[5] = htonl((u32) offset);
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bp[6] = 0;
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bp[7] = htonl((u32) length);
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return afs_make_call(&server->addr, call, GFP_NOFS, wait_mode);
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}
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/*
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* fetch data from a file
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*/
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@ -394,6 +468,10 @@ int afs_fs_fetch_data(struct afs_server *server,
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struct afs_call *call;
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__be32 *bp;
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if (upper_32_bits(offset) || upper_32_bits(offset + length))
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return afs_fs_fetch_data64(server, key, vnode, offset, length,
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buffer, wait_mode);
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_enter("");
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call = afs_alloc_flat_call(&afs_RXFSFetchData, 24, (21 + 3 + 6) * 4);
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@ -406,6 +484,7 @@ int afs_fs_fetch_data(struct afs_server *server,
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call->reply3 = buffer;
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call->service_id = FS_SERVICE;
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call->port = htons(AFS_FS_PORT);
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call->operation_ID = FSFETCHDATA;
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/* marshall the parameters */
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bp = call->request;
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@ -1032,6 +1111,73 @@ static const struct afs_call_type afs_RXFSStoreData = {
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.destructor = afs_flat_call_destructor,
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};
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static const struct afs_call_type afs_RXFSStoreData64 = {
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.name = "FS.StoreData64",
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.deliver = afs_deliver_fs_store_data,
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.abort_to_error = afs_abort_to_error,
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.destructor = afs_flat_call_destructor,
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};
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/*
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* store a set of pages to a very large file
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*/
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static int afs_fs_store_data64(struct afs_server *server,
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struct afs_writeback *wb,
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pgoff_t first, pgoff_t last,
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unsigned offset, unsigned to,
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loff_t size, loff_t pos, loff_t i_size,
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const struct afs_wait_mode *wait_mode)
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{
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struct afs_vnode *vnode = wb->vnode;
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struct afs_call *call;
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__be32 *bp;
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_enter(",%x,{%x:%u},,",
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key_serial(wb->key), vnode->fid.vid, vnode->fid.vnode);
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call = afs_alloc_flat_call(&afs_RXFSStoreData64,
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(4 + 6 + 3 * 2) * 4,
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(21 + 6) * 4);
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if (!call)
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return -ENOMEM;
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call->wb = wb;
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call->key = wb->key;
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call->reply = vnode;
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call->service_id = FS_SERVICE;
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call->port = htons(AFS_FS_PORT);
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call->mapping = vnode->vfs_inode.i_mapping;
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call->first = first;
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call->last = last;
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call->first_offset = offset;
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call->last_to = to;
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call->send_pages = true;
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call->store_version = vnode->status.data_version + 1;
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/* marshall the parameters */
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bp = call->request;
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*bp++ = htonl(FSSTOREDATA64);
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*bp++ = htonl(vnode->fid.vid);
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*bp++ = htonl(vnode->fid.vnode);
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*bp++ = htonl(vnode->fid.unique);
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*bp++ = 0; /* mask */
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*bp++ = 0; /* mtime */
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*bp++ = 0; /* owner */
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*bp++ = 0; /* group */
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*bp++ = 0; /* unix mode */
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*bp++ = 0; /* segment size */
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*bp++ = htonl(pos >> 32);
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*bp++ = htonl((u32) pos);
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*bp++ = htonl(size >> 32);
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*bp++ = htonl((u32) size);
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*bp++ = htonl(i_size >> 32);
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*bp++ = htonl((u32) i_size);
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return afs_make_call(&server->addr, call, GFP_NOFS, wait_mode);
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}
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/*
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* store a set of pages
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*/
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@ -1062,7 +1208,9 @@ int afs_fs_store_data(struct afs_server *server, struct afs_writeback *wb,
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(unsigned long long) size, (unsigned long long) pos,
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(unsigned long long) i_size);
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BUG_ON(i_size > 0xffffffff); // TODO: use 64-bit store
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if (pos >> 32 || i_size >> 32 || size >> 32 || (pos + size) >> 32)
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return afs_fs_store_data64(server, wb, first, last, offset, to,
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size, pos, i_size, wait_mode);
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call = afs_alloc_flat_call(&afs_RXFSStoreData,
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(4 + 6 + 3) * 4,
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@ -1158,6 +1306,61 @@ static const struct afs_call_type afs_RXFSStoreData_as_Status = {
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.destructor = afs_flat_call_destructor,
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};
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static const struct afs_call_type afs_RXFSStoreData64_as_Status = {
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.name = "FS.StoreData64",
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.deliver = afs_deliver_fs_store_status,
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.abort_to_error = afs_abort_to_error,
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.destructor = afs_flat_call_destructor,
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};
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/*
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* set the attributes on a very large file, using FS.StoreData rather than
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* FS.StoreStatus so as to alter the file size also
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*/
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static int afs_fs_setattr_size64(struct afs_server *server, struct key *key,
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struct afs_vnode *vnode, struct iattr *attr,
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const struct afs_wait_mode *wait_mode)
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{
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struct afs_call *call;
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__be32 *bp;
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_enter(",%x,{%x:%u},,",
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key_serial(key), vnode->fid.vid, vnode->fid.vnode);
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ASSERT(attr->ia_valid & ATTR_SIZE);
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call = afs_alloc_flat_call(&afs_RXFSStoreData64_as_Status,
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(4 + 6 + 3 * 2) * 4,
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(21 + 6) * 4);
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if (!call)
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return -ENOMEM;
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call->key = key;
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call->reply = vnode;
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call->service_id = FS_SERVICE;
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call->port = htons(AFS_FS_PORT);
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call->store_version = vnode->status.data_version + 1;
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call->operation_ID = FSSTOREDATA;
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/* marshall the parameters */
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bp = call->request;
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*bp++ = htonl(FSSTOREDATA64);
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*bp++ = htonl(vnode->fid.vid);
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*bp++ = htonl(vnode->fid.vnode);
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*bp++ = htonl(vnode->fid.unique);
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xdr_encode_AFS_StoreStatus(&bp, attr);
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*bp++ = 0; /* position of start of write */
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*bp++ = 0;
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*bp++ = 0; /* size of write */
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*bp++ = 0;
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*bp++ = htonl(attr->ia_size >> 32); /* new file length */
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*bp++ = htonl((u32) attr->ia_size);
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return afs_make_call(&server->addr, call, GFP_NOFS, wait_mode);
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}
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/*
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* set the attributes on a file, using FS.StoreData rather than FS.StoreStatus
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* so as to alter the file size also
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@ -1173,7 +1376,9 @@ static int afs_fs_setattr_size(struct afs_server *server, struct key *key,
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key_serial(key), vnode->fid.vid, vnode->fid.vnode);
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ASSERT(attr->ia_valid & ATTR_SIZE);
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ASSERTCMP(attr->ia_size, <=, 0xffffffff); // TODO: use 64-bit store
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if (attr->ia_size >> 32)
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return afs_fs_setattr_size64(server, key, vnode, attr,
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wait_mode);
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call = afs_alloc_flat_call(&afs_RXFSStoreData_as_Status,
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(4 + 6 + 3) * 4,
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@ -122,7 +122,7 @@ static int afs_prepare_page(struct afs_vnode *vnode, struct page *page,
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if (offset == 0 && to == PAGE_SIZE)
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return 0;
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p = kmap(page);
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p = kmap_atomic(page, KM_USER0);
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i_size = i_size_read(&vnode->vfs_inode);
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pos = (loff_t) page->index << PAGE_SHIFT;
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@ -133,7 +133,7 @@ static int afs_prepare_page(struct afs_vnode *vnode, struct page *page,
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memset(p, 0, offset);
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if (to < PAGE_SIZE)
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memset(p + to, 0, PAGE_SIZE - to);
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kunmap(page);
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kunmap_atomic(p, KM_USER0);
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return 0;
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}
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@ -152,7 +152,7 @@ static int afs_prepare_page(struct afs_vnode *vnode, struct page *page,
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memset(p + eof, 0, PAGE_SIZE - eof);
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}
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kunmap(p);
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kunmap_atomic(p, KM_USER0);
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ret = 0;
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if (offset > 0 || eof > to) {
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@ -489,14 +489,6 @@ int afs_writepage(struct page *page, struct writeback_control *wbc)
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_enter("{%lx},", page->index);
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if (wbc->sync_mode != WB_SYNC_NONE)
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wait_on_page_writeback(page);
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if (PageWriteback(page) || !PageDirty(page)) {
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unlock_page(page);
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return 0;
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}
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wb = (struct afs_writeback *) page_private(page);
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ASSERT(wb != NULL);
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