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authorPavel Shilovsky <pshilov@microsoft.com>2016-11-18 03:20:18 +0300
committerSteve French <smfrench@gmail.com>2017-02-02 01:46:36 +0300
commitd70b9104b1ca586f73aaf59426756cec3325a40e (patch)
tree82a1466d1c5ce26254f350b8e18a434cb4fa52c0 /fs
parent9b7c18a2d4b798963ea80f6769701dcc4c24b55e (diff)
downloadlinux-d70b9104b1ca586f73aaf59426756cec3325a40e.tar.xz
CIFS: Add copy into pages callback for a read operation
Since we have two different types of reads (pagecache and direct) we need to process such responses differently after decryption of a packet. The change allows to specify a callback that copies a read payload data into preallocated pages. Signed-off-by: Pavel Shilovsky <pshilov@microsoft.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/cifs/cifsglob.h3
-rw-r--r--fs/cifs/file.c52
2 files changed, 49 insertions, 6 deletions
diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index 8a04a013a4ac..d6172c8b61bf 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -1129,6 +1129,9 @@ struct cifs_readdata {
int (*read_into_pages)(struct TCP_Server_Info *server,
struct cifs_readdata *rdata,
unsigned int len);
+ int (*copy_into_pages)(struct TCP_Server_Info *server,
+ struct cifs_readdata *rdata,
+ struct iov_iter *iter);
struct kvec iov[2];
unsigned int pagesz;
unsigned int tailsz;
diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index 1cd0e2eefc66..98dc842e7245 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -2911,8 +2911,9 @@ cifs_uncached_readv_complete(struct work_struct *work)
}
static int
-cifs_uncached_read_into_pages(struct TCP_Server_Info *server,
- struct cifs_readdata *rdata, unsigned int len)
+uncached_fill_pages(struct TCP_Server_Info *server,
+ struct cifs_readdata *rdata, struct iov_iter *iter,
+ unsigned int len)
{
int result = 0;
unsigned int i;
@@ -2941,7 +2942,10 @@ cifs_uncached_read_into_pages(struct TCP_Server_Info *server,
rdata->tailsz = len;
len = 0;
}
- result = cifs_read_page_from_socket(server, page, n);
+ if (iter)
+ result = copy_page_from_iter(page, 0, n, iter);
+ else
+ result = cifs_read_page_from_socket(server, page, n);
if (result < 0)
break;
@@ -2953,6 +2957,21 @@ cifs_uncached_read_into_pages(struct TCP_Server_Info *server,
}
static int
+cifs_uncached_read_into_pages(struct TCP_Server_Info *server,
+ struct cifs_readdata *rdata, unsigned int len)
+{
+ return uncached_fill_pages(server, rdata, NULL, len);
+}
+
+static int
+cifs_uncached_copy_into_pages(struct TCP_Server_Info *server,
+ struct cifs_readdata *rdata,
+ struct iov_iter *iter)
+{
+ return uncached_fill_pages(server, rdata, iter, iter->count);
+}
+
+static int
cifs_send_async_read(loff_t offset, size_t len, struct cifsFileInfo *open_file,
struct cifs_sb_info *cifs_sb, struct list_head *rdata_list)
{
@@ -2999,6 +3018,7 @@ cifs_send_async_read(loff_t offset, size_t len, struct cifsFileInfo *open_file,
rdata->pid = pid;
rdata->pagesz = PAGE_SIZE;
rdata->read_into_pages = cifs_uncached_read_into_pages;
+ rdata->copy_into_pages = cifs_uncached_copy_into_pages;
rdata->credits = credits;
if (!rdata->cfile->invalidHandle ||
@@ -3349,8 +3369,9 @@ cifs_readv_complete(struct work_struct *work)
}
static int
-cifs_readpages_read_into_pages(struct TCP_Server_Info *server,
- struct cifs_readdata *rdata, unsigned int len)
+readpages_fill_pages(struct TCP_Server_Info *server,
+ struct cifs_readdata *rdata, struct iov_iter *iter,
+ unsigned int len)
{
int result = 0;
unsigned int i;
@@ -3404,7 +3425,10 @@ cifs_readpages_read_into_pages(struct TCP_Server_Info *server,
continue;
}
- result = cifs_read_page_from_socket(server, page, n);
+ if (iter)
+ result = copy_page_from_iter(page, 0, n, iter);
+ else
+ result = cifs_read_page_from_socket(server, page, n);
if (result < 0)
break;
@@ -3416,6 +3440,21 @@ cifs_readpages_read_into_pages(struct TCP_Server_Info *server,
}
static int
+cifs_readpages_read_into_pages(struct TCP_Server_Info *server,
+ struct cifs_readdata *rdata, unsigned int len)
+{
+ return readpages_fill_pages(server, rdata, NULL, len);
+}
+
+static int
+cifs_readpages_copy_into_pages(struct TCP_Server_Info *server,
+ struct cifs_readdata *rdata,
+ struct iov_iter *iter)
+{
+ return readpages_fill_pages(server, rdata, iter, iter->count);
+}
+
+static int
readpages_get_pages(struct address_space *mapping, struct list_head *page_list,
unsigned int rsize, struct list_head *tmplist,
unsigned int *nr_pages, loff_t *offset, unsigned int *bytes)
@@ -3569,6 +3608,7 @@ static int cifs_readpages(struct file *file, struct address_space *mapping,
rdata->pid = pid;
rdata->pagesz = PAGE_SIZE;
rdata->read_into_pages = cifs_readpages_read_into_pages;
+ rdata->copy_into_pages = cifs_readpages_copy_into_pages;
rdata->credits = credits;
list_for_each_entry_safe(page, tpage, &tmplist, lru) {