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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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20
fs/ext4/file.c
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@@ -97,9 +97,7 @@ ext4_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
struct blk_plug plug;
int o_direct = io_is_direct(file);
int overwrite = 0;
size_t length = iov_iter_count(from);
ssize_t ret;
loff_t pos;
/*
* Unaligned direct AIO must be serialized; see comment above
@@ -116,16 +114,10 @@ ext4_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
}
mutex_lock(&inode->i_mutex);
ret = generic_write_checks(file, &iocb->ki_pos, &length);
if (ret)
ret = generic_write_checks(iocb, from);
if (ret <= 0)
goto out;
if (length == 0)
goto out;
iov_iter_truncate(from, length);
pos = iocb->ki_pos;
/*
* If we have encountered a bitmap-format file, the size limit
* is smaller than s_maxbytes, which is for extent-mapped files.
@@ -133,19 +125,19 @@ ext4_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) {
struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
if (pos >= sbi->s_bitmap_maxbytes) {
if (iocb->ki_pos >= sbi->s_bitmap_maxbytes) {
ret = -EFBIG;
goto out;
}
iov_iter_truncate(from, sbi->s_bitmap_maxbytes - pos);
iov_iter_truncate(from, sbi->s_bitmap_maxbytes - iocb->ki_pos);
}
iocb->private = &overwrite;
if (o_direct) {
length = iov_iter_count(from);
size_t length = iov_iter_count(from);
loff_t pos = iocb->ki_pos;
blk_start_plug(&plug);
/* check whether we do a DIO overwrite or not */
if (ext4_should_dioread_nolock(inode) && !aio_mutex &&
!file->f_mapping->nrpages && pos + length <= i_size_read(inode)) {