coda: switch to ->read_iter/->write_iter

... and request the same from the local cache - all filesystems with
anything usable for that support those already.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 15 insertions, 25 deletions

diff --git a/fs/coda/file.c b/fs/coda/file.c
index d244d743a232..d9f1d9a85e04 100644
--- a/fs/coda/file.c
+++ b/fs/coda/file.c
@@ -27,19 +27,14 @@
 #include "coda_int.h"
 
 static ssize_t
-coda_file_read(struct file *coda_file, char __user *buf, size_t count, loff_t *ppos)
+coda_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
 {
-        struct coda_file_info *cfi;
-        struct file *host_file;
+        struct file *coda_file = iocb->ki_filp;
+        struct coda_file_info *cfi = CODA_FTOC(coda_file);
 
-        cfi = CODA_FTOC(coda_file);
         BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC);
-        host_file = cfi->cfi_container;
 
-        if (!host_file->f_op->read)
-                return -EINVAL;
-
-        return host_file->f_op->read(host_file, buf, count, ppos);
+        return vfs_iter_read(cfi->cfi_container, to, &iocb->ki_pos);
 }
 
 static ssize_t
@@ -64,32 +59,25 @@ coda_file_splice_read(struct file *coda_file, loff_t *ppos,
 }
 
 static ssize_t
-coda_file_write(struct file *coda_file, const char __user *buf, size_t count, loff_t *ppos)
+coda_file_write_iter(struct kiocb *iocb, struct iov_iter *to)
 {
-        struct inode *host_inode, *coda_inode = file_inode(coda_file);
-        struct coda_file_info *cfi;
+        struct file *coda_file = iocb->ki_filp;
+        struct inode *coda_inode = file_inode(coda_file);
+        struct coda_file_info *cfi = CODA_FTOC(coda_file);
         struct file *host_file;
         ssize_t ret;
 
-        cfi = CODA_FTOC(coda_file);
         BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC);
-        host_file = cfi->cfi_container;
-
-        if (!host_file->f_op->write)
-                return -EINVAL;
 
-        host_inode = file_inode(host_file);
+        host_file = cfi->cfi_container;
         file_start_write(host_file);
         mutex_lock(&coda_inode->i_mutex);
-
-        ret = host_file->f_op->write(host_file, buf, count, ppos);
-
-        coda_inode->i_size = host_inode->i_size;
+        ret = vfs_iter_write(cfi->cfi_container, to, &iocb->ki_pos);
+        coda_inode->i_size = file_inode(host_file)->i_size;
         coda_inode->i_blocks = (coda_inode->i_size + 511) >> 9;
         coda_inode->i_mtime = coda_inode->i_ctime = CURRENT_TIME_SEC;
         mutex_unlock(&coda_inode->i_mutex);
         file_end_write(host_file);
-
         return ret;
 }
 
@@ -231,8 +219,10 @@ int coda_fsync(struct file *coda_file, loff_t start, loff_t end, int datasync)
 
 const struct file_operations coda_file_operations = {
         .llseek         = generic_file_llseek,
-        .read           = coda_file_read,
-        .write          = coda_file_write,
+        .read           = new_sync_read,
+        .write          = new_sync_write,
+        .read_iter      = coda_file_read_iter,
+        .write_iter     = coda_file_write_iter,
         .mmap           = coda_file_mmap,
         .open           = coda_open,
         .release        = coda_release,