Merge branch 'work.read_write' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Pull read/write updates from Al Viro: "Christoph's fs/read_write.c series - consolidation and cleanups" * 'work.read_write' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: nfsd: remove nfsd_vfs_read nfsd: use vfs_iter_read/write fs: implement vfs_iter_write using do_iter_write fs: implement vfs_iter_read using do_iter_read fs: move more code into do_iter_read/do_iter_write fs: remove __do_readv_writev fs: remove do_compat_readv_writev fs: remove do_readv_writev
This commit is contained in:
Linus Torvalds
Коммит
89fbf5384d
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@ -273,7 +273,7 @@ static int lo_write_bvec(struct file *file, struct bio_vec *bvec, loff_t *ppos)
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iov_iter_bvec(&i, ITER_BVEC, bvec, 1, bvec->bv_len);
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file_start_write(file);
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bw = vfs_iter_write(file, &i, ppos);
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bw = vfs_iter_write(file, &i, ppos, 0);
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file_end_write(file);
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if (likely(bw == bvec->bv_len))
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@ -349,7 +349,7 @@ static int lo_read_simple(struct loop_device *lo, struct request *rq,
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rq_for_each_segment(bvec, rq, iter) {
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iov_iter_bvec(&i, ITER_BVEC, &bvec, 1, bvec.bv_len);
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len = vfs_iter_read(lo->lo_backing_file, &i, &pos);
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len = vfs_iter_read(lo->lo_backing_file, &i, &pos, 0);
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if (len < 0)
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return len;
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@ -390,7 +390,7 @@ static int lo_read_transfer(struct loop_device *lo, struct request *rq,
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b.bv_len = bvec.bv_len;
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iov_iter_bvec(&i, ITER_BVEC, &b, 1, b.bv_len);
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len = vfs_iter_read(lo->lo_backing_file, &i, &pos);
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len = vfs_iter_read(lo->lo_backing_file, &i, &pos, 0);
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if (len < 0) {
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ret = len;
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goto out_free_page;
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@ -273,9 +273,9 @@ static int fd_do_rw(struct se_cmd *cmd, struct file *fd,
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iov_iter_bvec(&iter, ITER_BVEC, bvec, sgl_nents, len);
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if (is_write)
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ret = vfs_iter_write(fd, &iter, &pos);
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ret = vfs_iter_write(fd, &iter, &pos, 0);
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else
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ret = vfs_iter_read(fd, &iter, &pos);
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ret = vfs_iter_read(fd, &iter, &pos, 0);
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if (is_write) {
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if (ret < 0 || ret != data_length) {
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@ -409,7 +409,7 @@ fd_execute_write_same(struct se_cmd *cmd)
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}
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iov_iter_bvec(&iter, ITER_BVEC, bvec, nolb, len);
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ret = vfs_iter_write(fd_dev->fd_file, &iter, &pos);
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ret = vfs_iter_write(fd_dev->fd_file, &iter, &pos, 0);
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kfree(bvec);
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if (ret < 0 || ret != len) {
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@ -34,7 +34,7 @@ coda_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
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BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC);
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return vfs_iter_read(cfi->cfi_container, to, &iocb->ki_pos);
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return vfs_iter_read(cfi->cfi_container, to, &iocb->ki_pos, 0);
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}
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static ssize_t
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@ -51,7 +51,7 @@ coda_file_write_iter(struct kiocb *iocb, struct iov_iter *to)
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host_file = cfi->cfi_container;
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file_start_write(host_file);
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inode_lock(coda_inode);
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ret = vfs_iter_write(cfi->cfi_container, to, &iocb->ki_pos);
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ret = vfs_iter_write(cfi->cfi_container, to, &iocb->ki_pos, 0);
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coda_inode->i_size = file_inode(host_file)->i_size;
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coda_inode->i_blocks = (coda_inode->i_size + 511) >> 9;
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coda_inode->i_mtime = coda_inode->i_ctime = current_time(coda_inode);
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@ -911,24 +911,13 @@ __be32 nfsd_splice_read(struct svc_rqst *rqstp,
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__be32 nfsd_readv(struct file *file, loff_t offset, struct kvec *vec, int vlen,
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unsigned long *count)
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{
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mm_segment_t oldfs;
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struct iov_iter iter;
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int host_err;
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oldfs = get_fs();
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set_fs(KERNEL_DS);
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host_err = vfs_readv(file, (struct iovec __user *)vec, vlen, &offset, 0);
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set_fs(oldfs);
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return nfsd_finish_read(file, count, host_err);
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}
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iov_iter_kvec(&iter, READ | ITER_KVEC, vec, vlen, *count);
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host_err = vfs_iter_read(file, &iter, &offset, 0);
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static __be32
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nfsd_vfs_read(struct svc_rqst *rqstp, struct file *file,
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loff_t offset, struct kvec *vec, int vlen, unsigned long *count)
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{
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if (file->f_op->splice_read && test_bit(RQ_SPLICE_OK, &rqstp->rq_flags))
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return nfsd_splice_read(rqstp, file, offset, count);
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else
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return nfsd_readv(file, offset, vec, vlen, count);
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return nfsd_finish_read(file, count, host_err);
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}
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/*
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@ -974,7 +963,7 @@ nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file,
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unsigned long *cnt, int stable)
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{
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struct svc_export *exp;
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mm_segment_t oldfs;
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struct iov_iter iter;
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__be32 err = 0;
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int host_err;
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int use_wgather;
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@ -1000,10 +989,8 @@ nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file,
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if (stable && !use_wgather)
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flags |= RWF_SYNC;
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/* Write the data. */
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oldfs = get_fs(); set_fs(KERNEL_DS);
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host_err = vfs_writev(file, (struct iovec __user *)vec, vlen, &pos, flags);
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set_fs(oldfs);
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iov_iter_kvec(&iter, WRITE | ITER_KVEC, vec, vlen, *cnt);
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host_err = vfs_iter_write(file, &iter, &pos, flags);
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if (host_err < 0)
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goto out_nfserr;
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*cnt = host_err;
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@ -1044,7 +1031,12 @@ __be32 nfsd_read(struct svc_rqst *rqstp, struct svc_fh *fhp,
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ra = nfsd_init_raparms(file);
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trace_read_opened(rqstp, fhp, offset, vlen);
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err = nfsd_vfs_read(rqstp, file, offset, vec, vlen, count);
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if (file->f_op->splice_read && test_bit(RQ_SPLICE_OK, &rqstp->rq_flags))
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err = nfsd_splice_read(rqstp, file, offset, count);
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else
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err = nfsd_readv(file, offset, vec, vlen, count);
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trace_read_io_done(rqstp, fhp, offset, vlen);
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if (ra)
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228
fs/read_write.c
228
fs/read_write.c
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@ -356,46 +356,6 @@ out_putf:
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}
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#endif
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ssize_t vfs_iter_read(struct file *file, struct iov_iter *iter, loff_t *ppos)
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{
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struct kiocb kiocb;
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ssize_t ret;
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if (!file->f_op->read_iter)
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return -EINVAL;
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init_sync_kiocb(&kiocb, file);
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kiocb.ki_pos = *ppos;
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iter->type |= READ;
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ret = call_read_iter(file, &kiocb, iter);
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BUG_ON(ret == -EIOCBQUEUED);
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if (ret > 0)
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*ppos = kiocb.ki_pos;
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return ret;
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}
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EXPORT_SYMBOL(vfs_iter_read);
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ssize_t vfs_iter_write(struct file *file, struct iov_iter *iter, loff_t *ppos)
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{
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struct kiocb kiocb;
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ssize_t ret;
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if (!file->f_op->write_iter)
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return -EINVAL;
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init_sync_kiocb(&kiocb, file);
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kiocb.ki_pos = *ppos;
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iter->type |= WRITE;
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ret = call_write_iter(file, &kiocb, iter);
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BUG_ON(ret == -EIOCBQUEUED);
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if (ret > 0)
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*ppos = kiocb.ki_pos;
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return ret;
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}
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EXPORT_SYMBOL(vfs_iter_write);
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int rw_verify_area(int read_write, struct file *file, const loff_t *ppos, size_t count)
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{
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struct inode *inode;
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@ -910,86 +870,114 @@ out:
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}
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#endif
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static ssize_t __do_readv_writev(int type, struct file *file,
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struct iov_iter *iter, loff_t *pos, int flags)
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static ssize_t do_iter_read(struct file *file, struct iov_iter *iter,
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loff_t *pos, int flags)
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{
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size_t tot_len;
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ssize_t ret = 0;
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if (!(file->f_mode & FMODE_READ))
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return -EBADF;
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if (!(file->f_mode & FMODE_CAN_READ))
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return -EINVAL;
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tot_len = iov_iter_count(iter);
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if (!tot_len)
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goto out;
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ret = rw_verify_area(type, file, pos, tot_len);
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ret = rw_verify_area(READ, file, pos, tot_len);
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if (ret < 0)
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goto out;
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return ret;
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if (type != READ)
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file_start_write(file);
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if ((type == READ && file->f_op->read_iter) ||
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(type == WRITE && file->f_op->write_iter))
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ret = do_iter_readv_writev(file, iter, pos, type, flags);
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if (file->f_op->read_iter)
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ret = do_iter_readv_writev(file, iter, pos, READ, flags);
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else
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ret = do_loop_readv_writev(file, iter, pos, type, flags);
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if (type != READ)
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file_end_write(file);
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ret = do_loop_readv_writev(file, iter, pos, READ, flags);
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out:
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if ((ret + (type == READ)) > 0) {
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if (type == READ)
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fsnotify_access(file);
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else
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fsnotify_modify(file);
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}
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if (ret >= 0)
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fsnotify_access(file);
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return ret;
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}
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static ssize_t do_readv_writev(int type, struct file *file,
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const struct iovec __user *uvector,
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unsigned long nr_segs, loff_t *pos,
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int flags)
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ssize_t vfs_iter_read(struct file *file, struct iov_iter *iter, loff_t *ppos,
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int flags)
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{
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if (!file->f_op->read_iter)
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return -EINVAL;
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return do_iter_read(file, iter, ppos, flags);
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}
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EXPORT_SYMBOL(vfs_iter_read);
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static ssize_t do_iter_write(struct file *file, struct iov_iter *iter,
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loff_t *pos, int flags)
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{
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size_t tot_len;
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ssize_t ret = 0;
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|
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if (!(file->f_mode & FMODE_WRITE))
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return -EBADF;
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if (!(file->f_mode & FMODE_CAN_WRITE))
|
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return -EINVAL;
|
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|
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tot_len = iov_iter_count(iter);
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if (!tot_len)
|
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return 0;
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ret = rw_verify_area(WRITE, file, pos, tot_len);
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if (ret < 0)
|
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return ret;
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|
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file_start_write(file);
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if (file->f_op->write_iter)
|
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ret = do_iter_readv_writev(file, iter, pos, WRITE, flags);
|
||||
else
|
||||
ret = do_loop_readv_writev(file, iter, pos, WRITE, flags);
|
||||
file_end_write(file);
|
||||
if (ret > 0)
|
||||
fsnotify_modify(file);
|
||||
return ret;
|
||||
}
|
||||
|
||||
ssize_t vfs_iter_write(struct file *file, struct iov_iter *iter, loff_t *ppos,
|
||||
int flags)
|
||||
{
|
||||
if (!file->f_op->write_iter)
|
||||
return -EINVAL;
|
||||
return do_iter_write(file, iter, ppos, flags);
|
||||
}
|
||||
EXPORT_SYMBOL(vfs_iter_write);
|
||||
|
||||
ssize_t vfs_readv(struct file *file, const struct iovec __user *vec,
|
||||
unsigned long vlen, loff_t *pos, int flags)
|
||||
{
|
||||
struct iovec iovstack[UIO_FASTIOV];
|
||||
struct iovec *iov = iovstack;
|
||||
struct iov_iter iter;
|
||||
ssize_t ret;
|
||||
|
||||
ret = import_iovec(type, uvector, nr_segs,
|
||||
ARRAY_SIZE(iovstack), &iov, &iter);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
ret = __do_readv_writev(type, file, &iter, pos, flags);
|
||||
kfree(iov);
|
||||
ret = import_iovec(READ, vec, vlen, ARRAY_SIZE(iovstack), &iov, &iter);
|
||||
if (ret >= 0) {
|
||||
ret = do_iter_read(file, &iter, pos, flags);
|
||||
kfree(iov);
|
||||
}
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
ssize_t vfs_readv(struct file *file, const struct iovec __user *vec,
|
||||
unsigned long vlen, loff_t *pos, int flags)
|
||||
{
|
||||
if (!(file->f_mode & FMODE_READ))
|
||||
return -EBADF;
|
||||
if (!(file->f_mode & FMODE_CAN_READ))
|
||||
return -EINVAL;
|
||||
|
||||
return do_readv_writev(READ, file, vec, vlen, pos, flags);
|
||||
}
|
||||
|
||||
EXPORT_SYMBOL(vfs_readv);
|
||||
|
||||
ssize_t vfs_writev(struct file *file, const struct iovec __user *vec,
|
||||
unsigned long vlen, loff_t *pos, int flags)
|
||||
{
|
||||
if (!(file->f_mode & FMODE_WRITE))
|
||||
return -EBADF;
|
||||
if (!(file->f_mode & FMODE_CAN_WRITE))
|
||||
return -EINVAL;
|
||||
struct iovec iovstack[UIO_FASTIOV];
|
||||
struct iovec *iov = iovstack;
|
||||
struct iov_iter iter;
|
||||
ssize_t ret;
|
||||
|
||||
return do_readv_writev(WRITE, file, vec, vlen, pos, flags);
|
||||
ret = import_iovec(WRITE, vec, vlen, ARRAY_SIZE(iovstack), &iov, &iter);
|
||||
if (ret >= 0) {
|
||||
ret = do_iter_write(file, &iter, pos, flags);
|
||||
kfree(iov);
|
||||
}
|
||||
return ret;
|
||||
}
|
||||
|
||||
EXPORT_SYMBOL(vfs_writev);
|
||||
|
||||
static ssize_t do_readv(unsigned long fd, const struct iovec __user *vec,
|
||||
|
|
@ -1137,44 +1125,20 @@ SYSCALL_DEFINE6(pwritev2, unsigned long, fd, const struct iovec __user *, vec,
|
|||
}
|
||||
|
||||
#ifdef CONFIG_COMPAT
|
||||
|
||||
static ssize_t compat_do_readv_writev(int type, struct file *file,
|
||||
const struct compat_iovec __user *uvector,
|
||||
unsigned long nr_segs, loff_t *pos,
|
||||
int flags)
|
||||
static size_t compat_readv(struct file *file,
|
||||
const struct compat_iovec __user *vec,
|
||||
unsigned long vlen, loff_t *pos, int flags)
|
||||
{
|
||||
struct iovec iovstack[UIO_FASTIOV];
|
||||
struct iovec *iov = iovstack;
|
||||
struct iov_iter iter;
|
||||
ssize_t ret;
|
||||
|
||||
ret = compat_import_iovec(type, uvector, nr_segs,
|
||||
UIO_FASTIOV, &iov, &iter);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
ret = __do_readv_writev(type, file, &iter, pos, flags);
|
||||
kfree(iov);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static size_t compat_readv(struct file *file,
|
||||
const struct compat_iovec __user *vec,
|
||||
unsigned long vlen, loff_t *pos, int flags)
|
||||
{
|
||||
ssize_t ret = -EBADF;
|
||||
|
||||
if (!(file->f_mode & FMODE_READ))
|
||||
goto out;
|
||||
|
||||
ret = -EINVAL;
|
||||
if (!(file->f_mode & FMODE_CAN_READ))
|
||||
goto out;
|
||||
|
||||
ret = compat_do_readv_writev(READ, file, vec, vlen, pos, flags);
|
||||
|
||||
out:
|
||||
ret = compat_import_iovec(READ, vec, vlen, UIO_FASTIOV, &iov, &iter);
|
||||
if (ret >= 0) {
|
||||
ret = do_iter_read(file, &iter, pos, flags);
|
||||
kfree(iov);
|
||||
}
|
||||
if (ret > 0)
|
||||
add_rchar(current, ret);
|
||||
inc_syscr(current);
|
||||
|
|
@ -1270,18 +1234,16 @@ static size_t compat_writev(struct file *file,
|
|||
const struct compat_iovec __user *vec,
|
||||
unsigned long vlen, loff_t *pos, int flags)
|
||||
{
|
||||
ssize_t ret = -EBADF;
|
||||
struct iovec iovstack[UIO_FASTIOV];
|
||||
struct iovec *iov = iovstack;
|
||||
struct iov_iter iter;
|
||||
ssize_t ret;
|
||||
|
||||
if (!(file->f_mode & FMODE_WRITE))
|
||||
goto out;
|
||||
|
||||
ret = -EINVAL;
|
||||
if (!(file->f_mode & FMODE_CAN_WRITE))
|
||||
goto out;
|
||||
|
||||
ret = compat_do_readv_writev(WRITE, file, vec, vlen, pos, flags);
|
||||
|
||||
out:
|
||||
ret = compat_import_iovec(WRITE, vec, vlen, UIO_FASTIOV, &iov, &iter);
|
||||
if (ret >= 0) {
|
||||
ret = do_iter_write(file, &iter, pos, flags);
|
||||
kfree(iov);
|
||||
}
|
||||
if (ret > 0)
|
||||
add_wchar(current, ret);
|
||||
inc_syscw(current);
|
||||
|
|
|
|||
|
|
@ -762,7 +762,7 @@ iter_file_splice_write(struct pipe_inode_info *pipe, struct file *out,
|
|||
|
||||
iov_iter_bvec(&from, ITER_BVEC | WRITE, array, n,
|
||||
sd.total_len - left);
|
||||
ret = vfs_iter_write(out, &from, &sd.pos);
|
||||
ret = vfs_iter_write(out, &from, &sd.pos, 0);
|
||||
if (ret <= 0)
|
||||
break;
|
||||
|
||||
|
|
|
|||
|
|
@ -2819,8 +2819,10 @@ extern ssize_t generic_file_write_iter(struct kiocb *, struct iov_iter *);
|
|||
extern ssize_t generic_file_direct_write(struct kiocb *, struct iov_iter *);
|
||||
extern ssize_t generic_perform_write(struct file *, struct iov_iter *, loff_t);
|
||||
|
||||
ssize_t vfs_iter_read(struct file *file, struct iov_iter *iter, loff_t *ppos);
|
||||
ssize_t vfs_iter_write(struct file *file, struct iov_iter *iter, loff_t *ppos);
|
||||
ssize_t vfs_iter_read(struct file *file, struct iov_iter *iter, loff_t *ppos,
|
||||
int flags);
|
||||
ssize_t vfs_iter_write(struct file *file, struct iov_iter *iter, loff_t *ppos,
|
||||
int flags);
|
||||
|
||||
/* fs/block_dev.c */
|
||||
extern ssize_t blkdev_read_iter(struct kiocb *iocb, struct iov_iter *to);
|
||||
|
|
|
|||
Загрузка…
Ссылка в новой задаче