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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 <viro@zeniv.linux.org.uk>

Conflicts:
	fs/ext4/file.c
This commit is contained in:
Al Viro
2015-04-09 12:55:47 -04:00
parent 90320251db
commit 3309dd04cb
14 changed files with 100 additions and 167 deletions
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25
fs/nfs/direct.c
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@@ -969,24 +969,19 @@ ssize_t nfs_file_direct_write(struct kiocb *iocb, struct iov_iter *iter,
struct nfs_direct_req *dreq;
struct nfs_lock_context *l_ctx;
loff_t end;
size_t count = iov_iter_count(iter);
end = (pos + count - 1) >> PAGE_CACHE_SHIFT;
nfs_add_stats(mapping->host, NFSIOS_DIRECTWRITTENBYTES, count);
dfprintk(FILE, "NFS: direct write(%pD2, %zd@%Ld)\n",
file, count, (long long) pos);
file, iov_iter_count(iter), (long long) iocb->ki_pos);
result = generic_write_checks(file, &pos, &count);
if (result)
result = generic_write_checks(iocb, iter);
if (result <= 0)
goto out;
result = -EINVAL;
if ((ssize_t) count < 0)
goto out;
result = 0;
if (!count)
goto out;
nfs_add_stats(mapping->host, NFSIOS_DIRECTWRITTENBYTES,
iov_iter_count(iter));
pos = iocb->ki_pos;
end = (pos + iov_iter_count(iter) - 1) >> PAGE_CACHE_SHIFT;
mutex_lock(&inode->i_mutex);
@@ -1001,7 +996,7 @@ ssize_t nfs_file_direct_write(struct kiocb *iocb, struct iov_iter *iter,
goto out_unlock;
}
task_io_account_write(count);
task_io_account_write(iov_iter_count(iter));
result = -ENOMEM;
dreq = nfs_direct_req_alloc();
@@ -1009,7 +1004,7 @@ ssize_t nfs_file_direct_write(struct kiocb *iocb, struct iov_iter *iter,
goto out_unlock;
dreq->inode = inode;
dreq->bytes_left = count;
dreq->bytes_left = iov_iter_count(iter);
dreq->io_start = pos;
dreq->ctx = get_nfs_open_context(nfs_file_open_context(iocb->ki_filp));
l_ctx = nfs_get_lock_context(dreq->ctx);