On Fri, Mar 18, 2022 at 03:49:42PM +0100, Ahmad Fatoum wrote:
> We already have pwrite_full, add pread_full for symmetry.
>
> Signed-off-by: Ahmad Fatoum <a.fatoum@xxxxxxxxxxxxxx>
> ---
> include/libfile.h | 1 +
> lib/libfile.c | 25 +++++++++++++++++++++++++
> 2 files changed, 26 insertions(+)
Applied, thanks
Sascha
>
> diff --git a/include/libfile.h b/include/libfile.h
> index 3c2fe1714dcb..a353ccfa9ea9 100644
> --- a/include/libfile.h
> +++ b/include/libfile.h
> @@ -2,6 +2,7 @@
> #ifndef __LIBFILE_H
> #define __LIBFILE_H
>
> +int pread_full(int fd, void *buf, size_t size, loff_t offset);
> int pwrite_full(int fd, const void *buf, size_t size, loff_t offset);
> int write_full(int fd, const void *buf, size_t size);
> int read_full(int fd, void *buf, size_t size);
> diff --git a/lib/libfile.c b/lib/libfile.c
> index 6b373f05ca72..1f533133c593 100644
> --- a/lib/libfile.c
> +++ b/lib/libfile.c
> @@ -75,6 +75,31 @@ int write_full(int fd, const void *buf, size_t size)
> }
> EXPORT_SYMBOL(write_full);
>
> +/*
> + * pread_full - read to filedescriptor at offset
> + *
> + * Like pread, but this function only returns less bytes than
> + * requested when the end of file is reached.
> + */
> +int pread_full(int fd, void *buf, size_t size, loff_t offset)
> +{
> + size_t insize = size;
> + int now;
> +
> + while (size) {
> + now = pread(fd, buf, size, offset);
> + if (now == 0)
> + break;
> + if (now < 0)
> + return now;
> + size -= now;
> + buf += now;
> + }
> +
> + return insize - size;
> +}
> +EXPORT_SYMBOL(pread_full);
> +
> /*
> * read_full - read from filedescriptor
> *
> --
> 2.30.2
>
>
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