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AFS: write support fixes
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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.

[[email protected]: fix right shift count >= width of type]
Signed-off-by: David Howells <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
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@dhowells
dhowells authored and Linus Torvalds committed May 10, 2007
1 parent 218e180 commit b9b1f8d
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Showing 3 changed files with 216 additions and 17 deletions.
2 changes: 2 additions & 0 deletions fs/afs/afs_fs.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -31,6 +31,8 @@ enum AFS_FS_Operations {
FSGETVOLUMEINFO = 148, /* AFS Get root volume information */
FSGETROOTVOLUME = 151, /* AFS Get root volume name */
FSLOOKUP = 161, /* AFS lookup file in directory */
FSFETCHDATA64 = 65537, /* AFS Fetch file data */
FSSTOREDATA64 = 65538, /* AFS Store file data */
};

enum AFS_FS_Errors {
Expand Down
217 changes: 211 additions & 6 deletions fs/afs/fsclient.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -293,9 +293,33 @@ static int afs_deliver_fs_fetch_data(struct afs_call *call,
case 0:
call->offset = 0;
call->unmarshall++;
if (call->operation_ID != FSFETCHDATA64) {
call->unmarshall++;
goto no_msw;
}

/* extract the returned data length */
/* extract the upper part of the returned data length of an
* FSFETCHDATA64 op (which should always be 0 using this
* client) */
case 1:
_debug("extract data length (MSW)");
ret = afs_extract_data(call, skb, last, &call->tmp, 4);
switch (ret) {
case 0: break;
case -EAGAIN: return 0;
default: return ret;
}

call->count = ntohl(call->tmp);
_debug("DATA length MSW: %u", call->count);
if (call->count > 0)
return -EBADMSG;
call->offset = 0;
call->unmarshall++;

no_msw:
/* extract the returned data length */
case 2:
_debug("extract data length");
ret = afs_extract_data(call, skb, last, &call->tmp, 4);
switch (ret) {
Expand All @@ -312,7 +336,7 @@ static int afs_deliver_fs_fetch_data(struct afs_call *call,
call->unmarshall++;

/* extract the returned data */
case 2:
case 3:
_debug("extract data");
if (call->count > 0) {
page = call->reply3;
Expand All @@ -331,7 +355,7 @@ static int afs_deliver_fs_fetch_data(struct afs_call *call,
call->unmarshall++;

/* extract the metadata */
case 3:
case 4:
ret = afs_extract_data(call, skb, last, call->buffer,
(21 + 3 + 6) * 4);
switch (ret) {
Expand All @@ -349,7 +373,7 @@ static int afs_deliver_fs_fetch_data(struct afs_call *call,
call->offset = 0;
call->unmarshall++;

case 4:
case 5:
_debug("trailer");
if (skb->len != 0)
return -EBADMSG;
Expand Down Expand Up @@ -381,6 +405,56 @@ static const struct afs_call_type afs_RXFSFetchData = {
.destructor = afs_flat_call_destructor,
};

static const struct afs_call_type afs_RXFSFetchData64 = {
.name = "FS.FetchData64",
.deliver = afs_deliver_fs_fetch_data,
.abort_to_error = afs_abort_to_error,
.destructor = afs_flat_call_destructor,
};

/*
* fetch data from a very large file
*/
static int afs_fs_fetch_data64(struct afs_server *server,
struct key *key,
struct afs_vnode *vnode,
off_t offset, size_t length,
struct page *buffer,
const struct afs_wait_mode *wait_mode)
{
struct afs_call *call;
__be32 *bp;

_enter("");

ASSERTCMP(length, <, ULONG_MAX);

call = afs_alloc_flat_call(&afs_RXFSFetchData64, 32, (21 + 3 + 6) * 4);
if (!call)
return -ENOMEM;

call->key = key;
call->reply = vnode;
call->reply2 = NULL; /* volsync */
call->reply3 = buffer;
call->service_id = FS_SERVICE;
call->port = htons(AFS_FS_PORT);
call->operation_ID = FSFETCHDATA64;

/* marshall the parameters */
bp = call->request;
bp[0] = htonl(FSFETCHDATA64);
bp[1] = htonl(vnode->fid.vid);
bp[2] = htonl(vnode->fid.vnode);
bp[3] = htonl(vnode->fid.unique);
bp[4] = htonl(upper_32_bits(offset));
bp[5] = htonl((u32) offset);
bp[6] = 0;
bp[7] = htonl((u32) length);

return afs_make_call(&server->addr, call, GFP_NOFS, wait_mode);
}

/*
* fetch data from a file
*/
Expand All @@ -394,6 +468,10 @@ int afs_fs_fetch_data(struct afs_server *server,
struct afs_call *call;
__be32 *bp;

if (upper_32_bits(offset) || upper_32_bits(offset + length))
return afs_fs_fetch_data64(server, key, vnode, offset, length,
buffer, wait_mode);

_enter("");

call = afs_alloc_flat_call(&afs_RXFSFetchData, 24, (21 + 3 + 6) * 4);
Expand All @@ -406,6 +484,7 @@ int afs_fs_fetch_data(struct afs_server *server,
call->reply3 = buffer;
call->service_id = FS_SERVICE;
call->port = htons(AFS_FS_PORT);
call->operation_ID = FSFETCHDATA;

/* marshall the parameters */
bp = call->request;
Expand Down Expand Up @@ -1032,6 +1111,73 @@ static const struct afs_call_type afs_RXFSStoreData = {
.destructor = afs_flat_call_destructor,
};

static const struct afs_call_type afs_RXFSStoreData64 = {
.name = "FS.StoreData64",
.deliver = afs_deliver_fs_store_data,
.abort_to_error = afs_abort_to_error,
.destructor = afs_flat_call_destructor,
};

/*
* store a set of pages to a very large file
*/
static int afs_fs_store_data64(struct afs_server *server,
struct afs_writeback *wb,
pgoff_t first, pgoff_t last,
unsigned offset, unsigned to,
loff_t size, loff_t pos, loff_t i_size,
const struct afs_wait_mode *wait_mode)
{
struct afs_vnode *vnode = wb->vnode;
struct afs_call *call;
__be32 *bp;

_enter(",%x,{%x:%u},,",
key_serial(wb->key), vnode->fid.vid, vnode->fid.vnode);

call = afs_alloc_flat_call(&afs_RXFSStoreData64,
(4 + 6 + 3 * 2) * 4,
(21 + 6) * 4);
if (!call)
return -ENOMEM;

call->wb = wb;
call->key = wb->key;
call->reply = vnode;
call->service_id = FS_SERVICE;
call->port = htons(AFS_FS_PORT);
call->mapping = vnode->vfs_inode.i_mapping;
call->first = first;
call->last = last;
call->first_offset = offset;
call->last_to = to;
call->send_pages = true;
call->store_version = vnode->status.data_version + 1;

/* marshall the parameters */
bp = call->request;
*bp++ = htonl(FSSTOREDATA64);
*bp++ = htonl(vnode->fid.vid);
*bp++ = htonl(vnode->fid.vnode);
*bp++ = htonl(vnode->fid.unique);

*bp++ = 0; /* mask */
*bp++ = 0; /* mtime */
*bp++ = 0; /* owner */
*bp++ = 0; /* group */
*bp++ = 0; /* unix mode */
*bp++ = 0; /* segment size */

*bp++ = htonl(pos >> 32);
*bp++ = htonl((u32) pos);
*bp++ = htonl(size >> 32);
*bp++ = htonl((u32) size);
*bp++ = htonl(i_size >> 32);
*bp++ = htonl((u32) i_size);

return afs_make_call(&server->addr, call, GFP_NOFS, wait_mode);
}

/*
* store a set of pages
*/
Expand Down Expand Up @@ -1062,7 +1208,9 @@ int afs_fs_store_data(struct afs_server *server, struct afs_writeback *wb,
(unsigned long long) size, (unsigned long long) pos,
(unsigned long long) i_size);

BUG_ON(i_size > 0xffffffff); // TODO: use 64-bit store
if (pos >> 32 || i_size >> 32 || size >> 32 || (pos + size) >> 32)
return afs_fs_store_data64(server, wb, first, last, offset, to,
size, pos, i_size, wait_mode);

call = afs_alloc_flat_call(&afs_RXFSStoreData,
(4 + 6 + 3) * 4,
Expand Down Expand Up @@ -1158,6 +1306,61 @@ static const struct afs_call_type afs_RXFSStoreData_as_Status = {
.destructor = afs_flat_call_destructor,
};

static const struct afs_call_type afs_RXFSStoreData64_as_Status = {
.name = "FS.StoreData64",
.deliver = afs_deliver_fs_store_status,
.abort_to_error = afs_abort_to_error,
.destructor = afs_flat_call_destructor,
};

/*
* set the attributes on a very large file, using FS.StoreData rather than
* FS.StoreStatus so as to alter the file size also
*/
static int afs_fs_setattr_size64(struct afs_server *server, struct key *key,
struct afs_vnode *vnode, struct iattr *attr,
const struct afs_wait_mode *wait_mode)
{
struct afs_call *call;
__be32 *bp;

_enter(",%x,{%x:%u},,",
key_serial(key), vnode->fid.vid, vnode->fid.vnode);

ASSERT(attr->ia_valid & ATTR_SIZE);

call = afs_alloc_flat_call(&afs_RXFSStoreData64_as_Status,
(4 + 6 + 3 * 2) * 4,
(21 + 6) * 4);
if (!call)
return -ENOMEM;

call->key = key;
call->reply = vnode;
call->service_id = FS_SERVICE;
call->port = htons(AFS_FS_PORT);
call->store_version = vnode->status.data_version + 1;
call->operation_ID = FSSTOREDATA;

/* marshall the parameters */
bp = call->request;
*bp++ = htonl(FSSTOREDATA64);
*bp++ = htonl(vnode->fid.vid);
*bp++ = htonl(vnode->fid.vnode);
*bp++ = htonl(vnode->fid.unique);

xdr_encode_AFS_StoreStatus(&bp, attr);

*bp++ = 0; /* position of start of write */
*bp++ = 0;
*bp++ = 0; /* size of write */
*bp++ = 0;
*bp++ = htonl(attr->ia_size >> 32); /* new file length */
*bp++ = htonl((u32) attr->ia_size);

return afs_make_call(&server->addr, call, GFP_NOFS, wait_mode);
}

/*
* set the attributes on a file, using FS.StoreData rather than FS.StoreStatus
* so as to alter the file size also
Expand All @@ -1173,7 +1376,9 @@ static int afs_fs_setattr_size(struct afs_server *server, struct key *key,
key_serial(key), vnode->fid.vid, vnode->fid.vnode);

ASSERT(attr->ia_valid & ATTR_SIZE);
ASSERTCMP(attr->ia_size, <=, 0xffffffff); // TODO: use 64-bit store
if (attr->ia_size >> 32)
return afs_fs_setattr_size64(server, key, vnode, attr,
wait_mode);

call = afs_alloc_flat_call(&afs_RXFSStoreData_as_Status,
(4 + 6 + 3) * 4,
Expand Down
14 changes: 3 additions & 11 deletions fs/afs/write.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -122,7 +122,7 @@ static int afs_prepare_page(struct afs_vnode *vnode, struct page *page,
if (offset == 0 && to == PAGE_SIZE)
return 0;

p = kmap(page);
p = kmap_atomic(page, KM_USER0);

i_size = i_size_read(&vnode->vfs_inode);
pos = (loff_t) page->index << PAGE_SHIFT;
Expand All @@ -133,7 +133,7 @@ static int afs_prepare_page(struct afs_vnode *vnode, struct page *page,
memset(p, 0, offset);
if (to < PAGE_SIZE)
memset(p + to, 0, PAGE_SIZE - to);
kunmap(page);
kunmap_atomic(p, KM_USER0);
return 0;
}

Expand All @@ -152,7 +152,7 @@ static int afs_prepare_page(struct afs_vnode *vnode, struct page *page,
memset(p + eof, 0, PAGE_SIZE - eof);
}

kunmap(p);
kunmap_atomic(p, KM_USER0);

ret = 0;
if (offset > 0 || eof > to) {
Expand Down Expand Up @@ -489,14 +489,6 @@ int afs_writepage(struct page *page, struct writeback_control *wbc)

_enter("{%lx},", page->index);

if (wbc->sync_mode != WB_SYNC_NONE)
wait_on_page_writeback(page);

if (PageWriteback(page) || !PageDirty(page)) {
unlock_page(page);
return 0;
}

wb = (struct afs_writeback *) page_private(page);
ASSERT(wb != NULL);

Expand Down

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