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See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Pass the read_iter method as a parameter and mark the function non-static. This allows reusing it for additional callsites e.g. in procfs. Signed-off-by: Christoph Hellwig --- fs/read_write.c | 8 +++++--- include/linux/fs.h | 2 ++ 2 files changed, 7 insertions(+), 3 deletions(-) diff --git a/fs/read_write.c b/fs/read_write.c index 8bec4418543994..7550c195a6a10e 100644 --- a/fs/read_write.c +++ b/fs/read_write.c @@ -401,7 +401,8 @@ int rw_verify_area(int read_write, struct file *file, const loff_t *ppos, size_t read_write == READ ? MAY_READ : MAY_WRITE); } -static ssize_t new_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos) +ssize_t iter_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos, + ssize_t (*cb)(struct kiocb *iocb, struct iov_iter *iter)) { struct iovec iov = { .iov_base = buf, .iov_len = len }; struct kiocb kiocb; @@ -412,7 +413,7 @@ static ssize_t new_sync_read(struct file *filp, char __user *buf, size_t len, lo kiocb.ki_pos = (ppos ? *ppos : 0); iov_iter_init(&iter, READ, &iov, 1, len); - ret = call_read_iter(filp, &kiocb, &iter); + ret = cb(&kiocb, &iter); BUG_ON(ret == -EIOCBQUEUED); if (ppos) *ppos = kiocb.ki_pos; @@ -488,7 +489,8 @@ ssize_t vfs_read(struct file *file, char __user *buf, size_t count, loff_t *pos) if (file->f_op->read) ret = file->f_op->read(file, buf, count, pos); else if (file->f_op->read_iter) - ret = new_sync_read(file, buf, count, pos); + ret = iter_read(file, buf, count, pos, + file->f_op->read_iter); else ret = -EINVAL; if (ret > 0) { diff --git a/include/linux/fs.h b/include/linux/fs.h index 0c0ec76b600b50..2e921d7dfd4878 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -1916,6 +1916,8 @@ ssize_t rw_copy_check_uvector(int type, const struct iovec __user * uvector, unsigned long nr_segs, unsigned long fast_segs, struct iovec *fast_pointer, struct iovec **ret_pointer); +ssize_t iter_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos, + ssize_t (*cb)(struct kiocb *iocb, struct iov_iter *iter)); extern ssize_t vfs_read(struct file *, char __user *, size_t, loff_t *); extern ssize_t vfs_write(struct file *, const char __user *, size_t, loff_t *); -- 2.26.2