Refator the fuse direct write code so that the fuse_perform_write
callig convention is simplified to match generic_perform_write and
it's updating ki_pos directly, and the generic direct_write_fallback
helper is used to consolidate buffered I/O fallback code.
Signed-off-by: Christoph Hellwig <h...@lst.de>
---
fs/fuse/file.c | 44 +++++++++++---------------------------------
1 file changed, 11 insertions(+), 33 deletions(-)
diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index de37a3a06a7169..55b64dac175d68 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -1280,13 +1280,13 @@ static inline unsigned int fuse_wr_pages(loff_t pos,
size_t len,
max_pages);
}
-static ssize_t fuse_perform_write(struct kiocb *iocb,
- struct address_space *mapping,
- struct iov_iter *ii, loff_t pos)
+static ssize_t fuse_perform_write(struct kiocb *iocb, struct iov_iter *ii)
{
+ struct address_space *mapping = iocb->ki_filp->f_mapping;
struct inode *inode = mapping->host;
struct fuse_conn *fc = get_fuse_conn(inode);
struct fuse_inode *fi = get_fuse_inode(inode);
+ loff_t pos = iocb->ki_pos;
int err = 0;
ssize_t res = 0;
@@ -1329,7 +1329,10 @@ static ssize_t fuse_perform_write(struct kiocb *iocb,
fuse_write_update_attr(inode, pos, res);
clear_bit(FUSE_I_SIZE_UNSTABLE, &fi->state);
- return res > 0 ? res : err;
+ if (!res)
+ return err;
+ iocb->ki_pos += res;
+ return res;
}
static ssize_t fuse_cache_write_iter(struct kiocb *iocb, struct iov_iter *from)
@@ -1337,11 +1340,9 @@ static ssize_t fuse_cache_write_iter(struct kiocb *iocb,
struct iov_iter *from)
struct file *file = iocb->ki_filp;
struct address_space *mapping = file->f_mapping;
ssize_t written = 0;
- ssize_t written_buffered = 0;
struct inode *inode = mapping->host;
ssize_t err;
struct fuse_conn *fc = get_fuse_conn(inode);
- loff_t endbyte = 0;
if (fc->writeback_cache) {
/* Update size (EOF optimization) and mode (SUID clearing) */
@@ -1378,35 +1379,12 @@ static ssize_t fuse_cache_write_iter(struct kiocb
*iocb, struct iov_iter *from)
goto out;
if (iocb->ki_flags & IOCB_DIRECT) {
- loff_t pos = iocb->ki_pos;
written = generic_file_direct_write(iocb, from);
- if (written < 0 || !iov_iter_count(from))
- goto out;
-
- pos += written;
-
- written_buffered = fuse_perform_write(iocb, mapping, from, pos);
- if (written_buffered < 0) {
- err = written_buffered;
- goto out;
- }
- endbyte = pos + written_buffered - 1;
-
- err = filemap_write_and_wait_range(file->f_mapping, pos,
- endbyte);
- if (err)
- goto out;
-
- invalidate_mapping_pages(file->f_mapping,
- pos >> PAGE_SHIFT,
- endbyte >> PAGE_SHIFT);
-
- written += written_buffered;
- iocb->ki_pos = pos + written_buffered;
+ if (written >= 0 && iov_iter_count(from))
+ written = direct_write_fallback(iocb, from, written,
+ fuse_perform_write(iocb, from));
} else {
- written = fuse_perform_write(iocb, mapping, from, iocb->ki_pos);
- if (written >= 0)
- iocb->ki_pos += written;
+ written = fuse_perform_write(iocb, from);
}
out:
current->backing_dev_info = NULL;
--
2.39.2
