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cifs: abstract out function to marshal the iovec for readv receives 

Cached and uncached reads will need to do different things here to
handle the difference when the pages are in pagecache and not. Abstract
out the function that marshals the page list into a kvec array.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
This commit is contained in:
Jeff Layton 2012-05-16 07:13:16 -04:00 committed by Steve French
parent 0471ca3fe4
commit 8d5ce4d23c
3 changed files with 74 additions and 63 deletions
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2
fs/cifs/cifsproto.h
View File

@ -472,6 +472,8 @@ struct cifs_readdata {
int result;
struct list_head pages;
struct work_struct work;
int (*marshal_iov) (struct cifs_readdata *rdata,
unsigned int remaining);
unsigned int nr_iov;
struct kvec iov[1];
};

67
fs/cifs/cifssmb.c
View File

@ -1436,13 +1436,10 @@ static int
cifs_readv_receive(struct TCP_Server_Info *server, struct mid_q_entry *mid)
{
int length, len;
unsigned int data_offset, remaining, data_len;
unsigned int data_offset, data_len;
struct cifs_readdata *rdata = mid->callback_data;
char *buf = server->smallbuf;
unsigned int buflen = get_rfc1002_length(buf) + 4;
u64 eof;
pgoff_t eof_index;
struct page *page, *tpage;
cFYI(1, "%s: mid=%llu offset=%llu bytes=%u", __func__,
mid->mid, rdata->offset, rdata->bytes);
@ -1525,64 +1522,8 @@ cifs_readv_receive(struct TCP_Server_Info *server, struct mid_q_entry *mid)
}
/* marshal up the page array */
len = 0;
remaining = data_len;
rdata->nr_iov = 1;
/* determine the eof that the server (probably) has */
eof = CIFS_I(rdata->mapping->host)->server_eof;
eof_index = eof ? (eof - 1) >> PAGE_CACHE_SHIFT : 0;
cFYI(1, "eof=%llu eof_index=%lu", eof, eof_index);
list_for_each_entry_safe(page, tpage, &rdata->pages, lru) {
if (remaining >= PAGE_CACHE_SIZE) {
/* enough data to fill the page */
rdata->iov[rdata->nr_iov].iov_base = kmap(page);
rdata->iov[rdata->nr_iov].iov_len = PAGE_CACHE_SIZE;
cFYI(1, "%u: idx=%lu iov_base=%p iov_len=%zu",
rdata->nr_iov, page->index,
rdata->iov[rdata->nr_iov].iov_base,
rdata->iov[rdata->nr_iov].iov_len);
++rdata->nr_iov;
len += PAGE_CACHE_SIZE;
remaining -= PAGE_CACHE_SIZE;
} else if (remaining > 0) {
/* enough for partial page, fill and zero the rest */
rdata->iov[rdata->nr_iov].iov_base = kmap(page);
rdata->iov[rdata->nr_iov].iov_len = remaining;
cFYI(1, "%u: idx=%lu iov_base=%p iov_len=%zu",
rdata->nr_iov, page->index,
rdata->iov[rdata->nr_iov].iov_base,
rdata->iov[rdata->nr_iov].iov_len);
memset(rdata->iov[rdata->nr_iov].iov_base + remaining,
'\0', PAGE_CACHE_SIZE - remaining);
++rdata->nr_iov;
len += remaining;
remaining = 0;
} else if (page->index > eof_index) {
/*
* The VFS will not try to do readahead past the
* i_size, but it's possible that we have outstanding
* writes with gaps in the middle and the i_size hasn't
* caught up yet. Populate those with zeroed out pages
* to prevent the VFS from repeatedly attempting to
* fill them until the writes are flushed.
*/
zero_user(page, 0, PAGE_CACHE_SIZE);
list_del(&page->lru);
lru_cache_add_file(page);
flush_dcache_page(page);
SetPageUptodate(page);
unlock_page(page);
page_cache_release(page);
} else {
/* no need to hold page hostage */
list_del(&page->lru);
lru_cache_add_file(page);
unlock_page(page);
page_cache_release(page);
}
}
len = rdata->marshal_iov(rdata, data_len);
data_len -= len;
/* issue the read if we have any iovecs left to fill */
if (rdata->nr_iov > 1) {
@ -1598,7 +1539,7 @@ cifs_readv_receive(struct TCP_Server_Info *server, struct mid_q_entry *mid)
rdata->bytes = length;
cFYI(1, "total_read=%u buflen=%u remaining=%u", server->total_read,
buflen, remaining);
buflen, data_len);
/* discard anything left over */
if (server->total_read < buflen)

68
fs/cifs/file.c
View File

@ -2654,6 +2654,73 @@ cifs_readv_complete(struct work_struct *work)
cifs_readdata_free(rdata);
}
static int
cifs_readpages_marshal_iov(struct cifs_readdata *rdata, unsigned int remaining)
{
int len = 0;
struct page *page, *tpage;
u64 eof;
pgoff_t eof_index;
/* determine the eof that the server (probably) has */
eof = CIFS_I(rdata->mapping->host)->server_eof;
eof_index = eof ? (eof - 1) >> PAGE_CACHE_SHIFT : 0;
cFYI(1, "eof=%llu eof_index=%lu", eof, eof_index);
rdata->nr_iov = 1;
list_for_each_entry_safe(page, tpage, &rdata->pages, lru) {
if (remaining >= PAGE_CACHE_SIZE) {
/* enough data to fill the page */
rdata->iov[rdata->nr_iov].iov_base = kmap(page);
rdata->iov[rdata->nr_iov].iov_len = PAGE_CACHE_SIZE;
cFYI(1, "%u: idx=%lu iov_base=%p iov_len=%zu",
rdata->nr_iov, page->index,
rdata->iov[rdata->nr_iov].iov_base,
rdata->iov[rdata->nr_iov].iov_len);
++rdata->nr_iov;
len += PAGE_CACHE_SIZE;
remaining -= PAGE_CACHE_SIZE;
} else if (remaining > 0) {
/* enough for partial page, fill and zero the rest */
rdata->iov[rdata->nr_iov].iov_base = kmap(page);
rdata->iov[rdata->nr_iov].iov_len = remaining;
cFYI(1, "%u: idx=%lu iov_base=%p iov_len=%zu",
rdata->nr_iov, page->index,
rdata->iov[rdata->nr_iov].iov_base,
rdata->iov[rdata->nr_iov].iov_len);
memset(rdata->iov[rdata->nr_iov].iov_base + remaining,
'\0', PAGE_CACHE_SIZE - remaining);
++rdata->nr_iov;
len += remaining;
remaining = 0;
} else if (page->index > eof_index) {
/*
* The VFS will not try to do readahead past the
* i_size, but it's possible that we have outstanding
* writes with gaps in the middle and the i_size hasn't
* caught up yet. Populate those with zeroed out pages
* to prevent the VFS from repeatedly attempting to
* fill them until the writes are flushed.
*/
zero_user(page, 0, PAGE_CACHE_SIZE);
list_del(&page->lru);
lru_cache_add_file(page);
flush_dcache_page(page);
SetPageUptodate(page);
unlock_page(page);
page_cache_release(page);
} else {
/* no need to hold page hostage */
list_del(&page->lru);
lru_cache_add_file(page);
unlock_page(page);
page_cache_release(page);
}
}
return len;
}
static int cifs_readpages(struct file *file, struct address_space *mapping,
struct list_head *page_list, unsigned num_pages)
{
@ -2777,6 +2844,7 @@ static int cifs_readpages(struct file *file, struct address_space *mapping,
rdata->offset = offset;
rdata->bytes = bytes;
rdata->pid = pid;
rdata->marshal_iov = cifs_readpages_marshal_iov;
list_splice_init(&tmplist, &rdata->pages);
do {