提交 e768d7ff 编写于 作者: A Al Viro

ext4_file_write_iter: move generic_write_checks() up

simpler that way...
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
上级 99733fa3
......@@ -99,7 +99,7 @@ ext4_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
int overwrite = 0;
size_t length = iov_iter_count(from);
ssize_t ret;
loff_t pos = iocb->ki_pos;
loff_t pos;
/*
* Unaligned direct AIO must be serialized; see comment above
......@@ -109,15 +109,22 @@ ext4_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS) &&
!is_sync_kiocb(iocb) &&
(file->f_flags & O_APPEND ||
ext4_unaligned_aio(inode, from, pos))) {
ext4_unaligned_aio(inode, from, iocb->ki_pos))) {
aio_mutex = ext4_aio_mutex(inode);
mutex_lock(aio_mutex);
ext4_unwritten_wait(inode);
}
mutex_lock(&inode->i_mutex);
if (file->f_flags & O_APPEND)
iocb->ki_pos = pos = i_size_read(inode);
ret = generic_write_checks(file, &iocb->ki_pos, &length);
if (ret)
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
......@@ -126,18 +133,16 @@ 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) ||
(pos == sbi->s_bitmap_maxbytes && length > 0)) {
mutex_unlock(&inode->i_mutex);
if (pos >= sbi->s_bitmap_maxbytes) {
ret = -EFBIG;
goto errout;
goto out;
}
iov_iter_truncate(from, sbi->s_bitmap_maxbytes - pos);
length = iov_iter_count(from);
}
iocb->private = &overwrite;
if (o_direct) {
length = iov_iter_count(from);
blk_start_plug(&plug);
......@@ -171,16 +176,7 @@ ext4_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
}
}
ret = generic_write_checks(file, &iocb->ki_pos, &length);
if (ret)
goto out;
if (length == 0)
goto out;
iov_iter_truncate(from, length);
ret = __generic_file_write_iter(iocb, from);
out:
mutex_unlock(&inode->i_mutex);
if (ret > 0) {
......@@ -193,7 +189,12 @@ ext4_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
if (o_direct)
blk_finish_plug(&plug);
errout:
if (aio_mutex)
mutex_unlock(aio_mutex);
return ret;
out:
mutex_unlock(&inode->i_mutex);
if (aio_mutex)
mutex_unlock(aio_mutex);
return ret;
......
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