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https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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3b87184f7e
The existing fadvise/madvise support only supports 32-bit lengths. Add support for 64-bit lengths, enabled by the application setting sqe->off rather than sqe->len for the length. If sqe->len is set, then that is used as the 32-bit length. If sqe->len is zero, then sqe->off is read for full 64-bit support. Older kernels will return -EINVAL if 64-bit support isn't available. Fixes:4840e418c2("io_uring: add IORING_OP_FADVISE") Fixes:c1ca757bd6("io_uring: add IORING_OP_MADVISE") Reported-by: Stefan <source@s.muenzel.net> Signed-off-by: Jens Axboe <axboe@kernel.dk>
109 lines
2.4 KiB
C
109 lines
2.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/fs.h>
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#include <linux/file.h>
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#include <linux/mm.h>
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#include <linux/slab.h>
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#include <linux/namei.h>
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#include <linux/io_uring.h>
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#include <uapi/linux/fadvise.h>
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#include <uapi/linux/io_uring.h>
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#include "io_uring.h"
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#include "advise.h"
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struct io_fadvise {
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struct file *file;
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u64 offset;
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u64 len;
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u32 advice;
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};
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struct io_madvise {
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struct file *file;
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u64 addr;
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u64 len;
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u32 advice;
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};
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int io_madvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
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{
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#if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU)
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struct io_madvise *ma = io_kiocb_to_cmd(req, struct io_madvise);
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if (sqe->buf_index || sqe->splice_fd_in)
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return -EINVAL;
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ma->addr = READ_ONCE(sqe->addr);
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ma->len = READ_ONCE(sqe->off);
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if (!ma->len)
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ma->len = READ_ONCE(sqe->len);
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ma->advice = READ_ONCE(sqe->fadvise_advice);
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req->flags |= REQ_F_FORCE_ASYNC;
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return 0;
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#else
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return -EOPNOTSUPP;
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#endif
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}
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int io_madvise(struct io_kiocb *req, unsigned int issue_flags)
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{
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#if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU)
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struct io_madvise *ma = io_kiocb_to_cmd(req, struct io_madvise);
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int ret;
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WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK);
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ret = do_madvise(current->mm, ma->addr, ma->len, ma->advice);
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io_req_set_res(req, ret, 0);
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return IOU_OK;
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#else
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return -EOPNOTSUPP;
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#endif
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}
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static bool io_fadvise_force_async(struct io_fadvise *fa)
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{
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switch (fa->advice) {
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case POSIX_FADV_NORMAL:
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case POSIX_FADV_RANDOM:
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case POSIX_FADV_SEQUENTIAL:
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return false;
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default:
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return true;
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}
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}
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int io_fadvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
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{
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struct io_fadvise *fa = io_kiocb_to_cmd(req, struct io_fadvise);
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if (sqe->buf_index || sqe->splice_fd_in)
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return -EINVAL;
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fa->offset = READ_ONCE(sqe->off);
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fa->len = READ_ONCE(sqe->addr);
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if (!fa->len)
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fa->len = READ_ONCE(sqe->len);
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fa->advice = READ_ONCE(sqe->fadvise_advice);
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if (io_fadvise_force_async(fa))
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req->flags |= REQ_F_FORCE_ASYNC;
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return 0;
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}
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int io_fadvise(struct io_kiocb *req, unsigned int issue_flags)
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{
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struct io_fadvise *fa = io_kiocb_to_cmd(req, struct io_fadvise);
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int ret;
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WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK && io_fadvise_force_async(fa));
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ret = vfs_fadvise(req->file, fa->offset, fa->len, fa->advice);
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if (ret < 0)
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req_set_fail(req);
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io_req_set_res(req, ret, 0);
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return IOU_OK;
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}
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