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switch generic_write_checks() to iocb and iter

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... returning -E... upon error and amount of data left in iter after
(possible) truncation upon success.  Note, that normal case gives
a non-zero (positive) return value, so any tests for != 0 _must_ be
updated.

Signed-off-by: Al Viro <[email protected]>

Conflicts:
	fs/ext4/file.c
This commit is contained in:
Al Viro 2015-04-09 12:55:47 -04:00
commit 3309dd04cb
14 changed files with 99 additions and 166 deletions
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14
fs/ncpfs/file.c
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@ -170,20 +170,15 @@ ncp_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
struct file *file = iocb->ki_filp;
struct inode *inode = file_inode(file);
size_t already_written = 0;
loff_t pos = iocb->ki_pos;
size_t count = iov_iter_count(from);
size_t bufsize;
int errno;
void *bouncebuffer;
off_t pos;
ncp_dbg(1, "enter %pD2\n", file);
errno = generic_write_checks(file, &pos, &count);
if (errno)
errno = generic_write_checks(iocb, from);
if (errno <= 0)
return errno;
iov_iter_truncate(from, count);
if (!count)
return 0;
errno = ncp_make_open(inode, O_WRONLY);
if (errno) {
@ -201,10 +196,11 @@ ncp_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
errno = -EIO; /* -ENOMEM */
goto outrel;
}
pos = iocb->ki_pos;
while (iov_iter_count(from)) {
int written_this_time;
size_t to_write = min_t(size_t,
bufsize - ((off_t)pos % bufsize),
bufsize - (pos % bufsize),
iov_iter_count(from));
if (copy_from_iter(bouncebuffer, to_write, from) != to_write) {