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SubjectRe: [PATCH v3] mm: add file_fdatawait_range and file_write_and_wait
On Mon 31-07-17 12:49:25, Jeff Layton wrote:
> From: Jeff Layton <jlayton@redhat.com>
>
> Necessary now for gfs2_fsync and sync_file_range, but there will
> eventually be other callers.
>
> Signed-off-by: Jeff Layton <jlayton@redhat.com>

Looks good to me. You can add:

Reviewed-by: Jan Kara <jack@suse.cz>

Honza

> ---
> include/linux/fs.h | 11 ++++++++++-
> mm/filemap.c | 23 +++++++++++++++++++++++
> 2 files changed, 33 insertions(+), 1 deletion(-)
>
> v3: make file_write_and_wait a wrapper around file_write_and_wait_range
>
> diff --git a/include/linux/fs.h b/include/linux/fs.h
> index 526b6a9f30d4..909210bd6366 100644
> --- a/include/linux/fs.h
> +++ b/include/linux/fs.h
> @@ -2549,6 +2549,8 @@ static inline int filemap_fdatawait(struct address_space *mapping)
>
> extern bool filemap_range_has_page(struct address_space *, loff_t lstart,
> loff_t lend);
> +extern int __must_check file_fdatawait_range(struct file *file, loff_t lstart,
> + loff_t lend);
> extern int filemap_write_and_wait(struct address_space *mapping);
> extern int filemap_write_and_wait_range(struct address_space *mapping,
> loff_t lstart, loff_t lend);
> @@ -2557,12 +2559,19 @@ extern int __filemap_fdatawrite_range(struct address_space *mapping,
> extern int filemap_fdatawrite_range(struct address_space *mapping,
> loff_t start, loff_t end);
> extern int filemap_check_errors(struct address_space *mapping);
> -
> extern void __filemap_set_wb_err(struct address_space *mapping, int err);
> +
> +extern int __must_check file_fdatawait_range(struct file *file, loff_t lstart,
> + loff_t lend);
> extern int __must_check file_check_and_advance_wb_err(struct file *file);
> extern int __must_check file_write_and_wait_range(struct file *file,
> loff_t start, loff_t end);
>
> +static inline int file_write_and_wait(struct file *file)
> +{
> + return file_write_and_wait_range(file, 0, LLONG_MAX);
> +}
> +
> /**
> * filemap_set_wb_err - set a writeback error on an address_space
> * @mapping: mapping in which to set writeback error
> diff --git a/mm/filemap.c b/mm/filemap.c
> index 953804b29a75..85dfe3bee324 100644
> --- a/mm/filemap.c
> +++ b/mm/filemap.c
> @@ -476,6 +476,29 @@ int filemap_fdatawait_range(struct address_space *mapping, loff_t start_byte,
> EXPORT_SYMBOL(filemap_fdatawait_range);
>
> /**
> + * file_fdatawait_range - wait for writeback to complete
> + * @file: file pointing to address space structure to wait for
> + * @start_byte: offset in bytes where the range starts
> + * @end_byte: offset in bytes where the range ends (inclusive)
> + *
> + * Walk the list of under-writeback pages of the address space that file
> + * refers to, in the given range and wait for all of them. Check error
> + * status of the address space vs. the file->f_wb_err cursor and return it.
> + *
> + * Since the error status of the file is advanced by this function,
> + * callers are responsible for checking the return value and handling and/or
> + * reporting the error.
> + */
> +int file_fdatawait_range(struct file *file, loff_t start_byte, loff_t end_byte)
> +{
> + struct address_space *mapping = file->f_mapping;
> +
> + __filemap_fdatawait_range(mapping, start_byte, end_byte);
> + return file_check_and_advance_wb_err(file);
> +}
> +EXPORT_SYMBOL(file_fdatawait_range);
> +
> +/**
> * filemap_fdatawait_keep_errors - wait for writeback without clearing errors
> * @mapping: address space structure to wait for
> *
> --
> 2.13.3
>
--
Jan Kara <jack@suse.com>
SUSE Labs, CR

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