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write_iter variants of {__,}generic_file_aio_write()

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Signed-off-by: Al Viro <[email protected]>
This commit is contained in:
Al Viro 2014-04-03 03:17:43 -04:00
commit 8174202b34
29 changed files with 94 additions and 79 deletions
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61
mm/filemap.c
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@ -2542,10 +2542,9 @@ again:
EXPORT_SYMBOL(generic_perform_write);
/**
* __generic_file_aio_write - write data to a file
* __generic_file_write_iter - write data to a file
* @iocb: IO state structure (file, offset, etc.)
* @iov: vector with data to write
* @nr_segs: number of segments in the vector
* @from: iov_iter with data to write
*
* This function does all the work needed for actually writing data to a
* file. It does all basic checks, removes SUID from the file, updates
@ -2559,21 +2558,16 @@ EXPORT_SYMBOL(generic_perform_write);
* A caller has to handle it. This is mainly due to the fact that we want to
* avoid syncing under i_mutex.
*/
ssize_t __generic_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
unsigned long nr_segs)
ssize_t __generic_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
{
struct file *file = iocb->ki_filp;
struct address_space * mapping = file->f_mapping;
size_t count; /* after file limit checks */
struct inode *inode = mapping->host;
loff_t pos = iocb->ki_pos;
ssize_t written = 0;
ssize_t err;
ssize_t status;
struct iov_iter from;
count = iov_length(iov, nr_segs);
iov_iter_init(&from, WRITE, iov, nr_segs, count);
size_t count = iov_iter_count(from);
/* We can write back this queue in page reclaim */
current->backing_dev_info = mapping->backing_dev_info;
@ -2584,7 +2578,7 @@ ssize_t __generic_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
if (count == 0)
goto out;
iov_iter_truncate(&from, count);
iov_iter_truncate(from, count);
err = file_remove_suid(file);
if (err)
@ -2598,7 +2592,7 @@ ssize_t __generic_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
if (unlikely(file->f_flags & O_DIRECT)) {
loff_t endbyte;
written = generic_file_direct_write(iocb, &from, pos);
written = generic_file_direct_write(iocb, from, pos);
if (written < 0 || written == count)
goto out;
@ -2609,7 +2603,7 @@ ssize_t __generic_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
pos += written;
count -= written;
status = generic_perform_write(file, &from, pos);
status = generic_perform_write(file, from, pos);
/*
* If generic_perform_write() returned a synchronous error
* then we want to return the number of bytes which were
@ -2641,7 +2635,7 @@ ssize_t __generic_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
*/
}
} else {
written = generic_perform_write(file, &from, pos);
written = generic_perform_write(file, from, pos);
if (likely(written >= 0))
iocb->ki_pos = pos + written;
}
@ -2649,30 +2643,36 @@ out:
current->backing_dev_info = NULL;
return written ? written : err;
}
EXPORT_SYMBOL(__generic_file_write_iter);
ssize_t __generic_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
unsigned long nr_segs)
{
size_t count = iov_length(iov, nr_segs);
struct iov_iter from;
iov_iter_init(&from, WRITE, iov, nr_segs, count);
return __generic_file_write_iter(iocb, &from);
}
EXPORT_SYMBOL(__generic_file_aio_write);
/**
* generic_file_aio_write - write data to a file
* generic_file_write_iter - write data to a file
* @iocb: IO state structure
* @iov: vector with data to write
* @nr_segs: number of segments in the vector
* @pos: position in file where to write
* @from: iov_iter with data to write
*
* This is a wrapper around __generic_file_aio_write() to be used by most
* This is a wrapper around __generic_file_write_iter() to be used by most
* filesystems. It takes care of syncing the file in case of O_SYNC file
* and acquires i_mutex as needed.
*/
ssize_t generic_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
unsigned long nr_segs, loff_t pos)
ssize_t generic_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
{
struct file *file = iocb->ki_filp;
struct inode *inode = file->f_mapping->host;
ssize_t ret;
BUG_ON(iocb->ki_pos != pos);
mutex_lock(&inode->i_mutex);
ret = __generic_file_aio_write(iocb, iov, nr_segs);
ret = __generic_file_write_iter(iocb, from);
mutex_unlock(&inode->i_mutex);
if (ret > 0) {
@ -2684,6 +2684,19 @@ ssize_t generic_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
}
return ret;
}
EXPORT_SYMBOL(generic_file_write_iter);
ssize_t generic_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
unsigned long nr_segs, loff_t pos)
{
size_t count = iov_length(iov, nr_segs);
struct iov_iter from;
BUG_ON(iocb->ki_pos != pos);
iov_iter_init(&from, WRITE, iov, nr_segs, count);
return generic_file_write_iter(iocb, &from);
}
EXPORT_SYMBOL(generic_file_aio_write);
/**