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Diffstat (limited to 'fs/cifs/file.c')
-rw-r--r--fs/cifs/file.c128
1 files changed, 52 insertions, 76 deletions
diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index 216d7e99f921..8807442c94dd 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -2579,19 +2579,32 @@ cifs_writev(struct kiocb *iocb, const struct iovec *iov,
struct cifsInodeInfo *cinode = CIFS_I(inode);
struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server;
ssize_t rc = -EACCES;
- loff_t lock_pos = pos;
+ loff_t lock_pos = iocb->ki_pos;
- if (file->f_flags & O_APPEND)
- lock_pos = i_size_read(inode);
/*
* We need to hold the sem to be sure nobody modifies lock list
* with a brlock that prevents writing.
*/
down_read(&cinode->lock_sem);
+ mutex_lock(&inode->i_mutex);
+ if (file->f_flags & O_APPEND)
+ lock_pos = i_size_read(inode);
if (!cifs_find_lock_conflict(cfile, lock_pos, iov_length(iov, nr_segs),
server->vals->exclusive_lock_type, NULL,
- CIFS_WRITE_OP))
- rc = generic_file_aio_write(iocb, iov, nr_segs, pos);
+ CIFS_WRITE_OP)) {
+ rc = __generic_file_aio_write(iocb, iov, nr_segs);
+ mutex_unlock(&inode->i_mutex);
+
+ if (rc > 0) {
+ ssize_t err;
+
+ err = generic_write_sync(file, iocb->ki_pos - rc, rc);
+ if (rc < 0)
+ rc = err;
+ }
+ } else {
+ mutex_unlock(&inode->i_mutex);
+ }
up_read(&cinode->lock_sem);
return rc;
}
@@ -2727,56 +2740,27 @@ cifs_retry_async_readv(struct cifs_readdata *rdata)
/**
* cifs_readdata_to_iov - copy data from pages in response to an iovec
* @rdata: the readdata response with list of pages holding data
- * @iov: vector in which we should copy the data
- * @nr_segs: number of segments in vector
- * @offset: offset into file of the first iovec
- * @copied: used to return the amount of data copied to the iov
+ * @iter: destination for our data
*
* This function copies data from a list of pages in a readdata response into
* an array of iovecs. It will first calculate where the data should go
* based on the info in the readdata and then copy the data into that spot.
*/
-static ssize_t
-cifs_readdata_to_iov(struct cifs_readdata *rdata, const struct iovec *iov,
- unsigned long nr_segs, loff_t offset, ssize_t *copied)
+static int
+cifs_readdata_to_iov(struct cifs_readdata *rdata, struct iov_iter *iter)
{
- int rc = 0;
- struct iov_iter ii;
- size_t pos = rdata->offset - offset;
- ssize_t remaining = rdata->bytes;
- unsigned char *pdata;
+ size_t remaining = rdata->bytes;
unsigned int i;
- /* set up iov_iter and advance to the correct offset */
- iov_iter_init(&ii, iov, nr_segs, iov_length(iov, nr_segs), 0);
- iov_iter_advance(&ii, pos);
-
- *copied = 0;
for (i = 0; i < rdata->nr_pages; i++) {
- ssize_t copy;
struct page *page = rdata->pages[i];
-
- /* copy a whole page or whatever's left */
- copy = min_t(ssize_t, remaining, PAGE_SIZE);
-
- /* ...but limit it to whatever space is left in the iov */
- copy = min_t(ssize_t, copy, iov_iter_count(&ii));
-
- /* go while there's data to be copied and no errors */
- if (copy && !rc) {
- pdata = kmap(page);
- rc = memcpy_toiovecend(ii.iov, pdata, ii.iov_offset,
- (int)copy);
- kunmap(page);
- if (!rc) {
- *copied += copy;
- remaining -= copy;
- iov_iter_advance(&ii, copy);
- }
- }
+ size_t copy = min(remaining, PAGE_SIZE);
+ size_t written = copy_page_to_iter(page, 0, copy, iter);
+ remaining -= written;
+ if (written < copy && iov_iter_count(iter) > 0)
+ break;
}
-
- return rc;
+ return remaining ? -EFAULT : 0;
}
static void
@@ -2837,20 +2821,21 @@ cifs_uncached_read_into_pages(struct TCP_Server_Info *server,
return total_read > 0 ? total_read : result;
}
-static ssize_t
-cifs_iovec_read(struct file *file, const struct iovec *iov,
- unsigned long nr_segs, loff_t *poffset)
+ssize_t cifs_user_readv(struct kiocb *iocb, const struct iovec *iov,
+ unsigned long nr_segs, loff_t pos)
{
+ struct file *file = iocb->ki_filp;
ssize_t rc;
size_t len, cur_len;
ssize_t total_read = 0;
- loff_t offset = *poffset;
+ loff_t offset = pos;
unsigned int npages;
struct cifs_sb_info *cifs_sb;
struct cifs_tcon *tcon;
struct cifsFileInfo *open_file;
struct cifs_readdata *rdata, *tmp;
struct list_head rdata_list;
+ struct iov_iter to;
pid_t pid;
if (!nr_segs)
@@ -2860,6 +2845,8 @@ cifs_iovec_read(struct file *file, const struct iovec *iov,
if (!len)
return 0;
+ iov_iter_init(&to, iov, nr_segs, len, 0);
+
INIT_LIST_HEAD(&rdata_list);
cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
open_file = file->private_data;
@@ -2917,55 +2904,44 @@ error:
if (!list_empty(&rdata_list))
rc = 0;
+ len = iov_iter_count(&to);
/* the loop below should proceed in the order of increasing offsets */
-restart_loop:
list_for_each_entry_safe(rdata, tmp, &rdata_list, list) {
+ again:
if (!rc) {
- ssize_t copied;
-
/* FIXME: freezable sleep too? */
rc = wait_for_completion_killable(&rdata->done);
if (rc)
rc = -EINTR;
- else if (rdata->result)
+ else if (rdata->result) {
rc = rdata->result;
- else {
- rc = cifs_readdata_to_iov(rdata, iov,
- nr_segs, *poffset,
- &copied);
- total_read += copied;
+ /* resend call if it's a retryable error */
+ if (rc == -EAGAIN) {
+ rc = cifs_retry_async_readv(rdata);
+ goto again;
+ }
+ } else {
+ rc = cifs_readdata_to_iov(rdata, &to);
}
- /* resend call if it's a retryable error */
- if (rc == -EAGAIN) {
- rc = cifs_retry_async_readv(rdata);
- goto restart_loop;
- }
}
list_del_init(&rdata->list);
kref_put(&rdata->refcount, cifs_uncached_readdata_release);
}
+ total_read = len - iov_iter_count(&to);
+
cifs_stats_bytes_read(tcon, total_read);
- *poffset += total_read;
/* mask nodata case */
if (rc == -ENODATA)
rc = 0;
- return total_read ? total_read : rc;
-}
-
-ssize_t cifs_user_readv(struct kiocb *iocb, const struct iovec *iov,
- unsigned long nr_segs, loff_t pos)
-{
- ssize_t read;
-
- read = cifs_iovec_read(iocb->ki_filp, iov, nr_segs, &pos);
- if (read > 0)
- iocb->ki_pos = pos;
-
- return read;
+ if (total_read) {
+ iocb->ki_pos = pos + total_read;
+ return total_read;
+ }
+ return rc;
}
ssize_t
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