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Message-ID: <20070509124259.12319.62090.stgit@warthog.cambridge.redhat.com>
Date: Wed, 09 May 2007 13:42:59 +0100
From: David Howells <dhowells@...hat.com>
To: akpm@...l.org, netdev@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
dhowells@...hat.com
Subject: [PATCH] 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.
Signed-off-by: David Howells <dhowells@...hat.com>
---
fs/afs/afs_fs.h | 2
fs/afs/fsclient.c | 217 ++++++++++++++++++++++++++++++++++++++++++++++++++++-
fs/afs/write.c | 14 +--
3 files changed, 216 insertions(+), 17 deletions(-)
diff --git a/fs/afs/afs_fs.h b/fs/afs/afs_fs.h
index 2198006..d963ef4 100644
--- a/fs/afs/afs_fs.h
+++ b/fs/afs/afs_fs.h
@@ -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 {
diff --git a/fs/afs/fsclient.c b/fs/afs/fsclient.c
index a552699..8817076 100644
--- a/fs/afs/fsclient.c
+++ b/fs/afs/fsclient.c
@@ -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) {
@@ -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;
@@ -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) {
@@ -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;
@@ -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(offset >> 32);
+ 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
*/
@@ -394,6 +468,10 @@ int afs_fs_fetch_data(struct afs_server *server,
struct afs_call *call;
__be32 *bp;
+ if (offset >> 32 || (offset + length) >> 32)
+ 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);
@@ -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;
@@ -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
*/
@@ -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,
@@ -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
@@ -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,
diff --git a/fs/afs/write.c b/fs/afs/write.c
index 83ff292..aa03d43 100644
--- a/fs/afs/write.c
+++ b/fs/afs/write.c
@@ -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;
@@ -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;
}
@@ -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) {
@@ -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);
-
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