0001
0002 #include <linux/kernel.h>
0003 #include <linux/errno.h>
0004 #include <linux/fs.h>
0005 #include <linux/file.h>
0006 #include <linux/mm.h>
0007 #include <linux/slab.h>
0008 #include <linux/namei.h>
0009 #include <linux/io_uring.h>
0010
0011 #include <uapi/linux/io_uring.h>
0012
0013 #include "../fs/internal.h"
0014
0015 #include "io_uring.h"
0016 #include "fs.h"
0017
0018 struct io_rename {
0019 struct file *file;
0020 int old_dfd;
0021 int new_dfd;
0022 struct filename *oldpath;
0023 struct filename *newpath;
0024 int flags;
0025 };
0026
0027 struct io_unlink {
0028 struct file *file;
0029 int dfd;
0030 int flags;
0031 struct filename *filename;
0032 };
0033
0034 struct io_mkdir {
0035 struct file *file;
0036 int dfd;
0037 umode_t mode;
0038 struct filename *filename;
0039 };
0040
0041 struct io_link {
0042 struct file *file;
0043 int old_dfd;
0044 int new_dfd;
0045 struct filename *oldpath;
0046 struct filename *newpath;
0047 int flags;
0048 };
0049
0050 int io_renameat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
0051 {
0052 struct io_rename *ren = io_kiocb_to_cmd(req, struct io_rename);
0053 const char __user *oldf, *newf;
0054
0055 if (sqe->buf_index || sqe->splice_fd_in)
0056 return -EINVAL;
0057 if (unlikely(req->flags & REQ_F_FIXED_FILE))
0058 return -EBADF;
0059
0060 ren->old_dfd = READ_ONCE(sqe->fd);
0061 oldf = u64_to_user_ptr(READ_ONCE(sqe->addr));
0062 newf = u64_to_user_ptr(READ_ONCE(sqe->addr2));
0063 ren->new_dfd = READ_ONCE(sqe->len);
0064 ren->flags = READ_ONCE(sqe->rename_flags);
0065
0066 ren->oldpath = getname(oldf);
0067 if (IS_ERR(ren->oldpath))
0068 return PTR_ERR(ren->oldpath);
0069
0070 ren->newpath = getname(newf);
0071 if (IS_ERR(ren->newpath)) {
0072 putname(ren->oldpath);
0073 return PTR_ERR(ren->newpath);
0074 }
0075
0076 req->flags |= REQ_F_NEED_CLEANUP;
0077 return 0;
0078 }
0079
0080 int io_renameat(struct io_kiocb *req, unsigned int issue_flags)
0081 {
0082 struct io_rename *ren = io_kiocb_to_cmd(req, struct io_rename);
0083 int ret;
0084
0085 if (issue_flags & IO_URING_F_NONBLOCK)
0086 return -EAGAIN;
0087
0088 ret = do_renameat2(ren->old_dfd, ren->oldpath, ren->new_dfd,
0089 ren->newpath, ren->flags);
0090
0091 req->flags &= ~REQ_F_NEED_CLEANUP;
0092 io_req_set_res(req, ret, 0);
0093 return IOU_OK;
0094 }
0095
0096 void io_renameat_cleanup(struct io_kiocb *req)
0097 {
0098 struct io_rename *ren = io_kiocb_to_cmd(req, struct io_rename);
0099
0100 putname(ren->oldpath);
0101 putname(ren->newpath);
0102 }
0103
0104 int io_unlinkat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
0105 {
0106 struct io_unlink *un = io_kiocb_to_cmd(req, struct io_unlink);
0107 const char __user *fname;
0108
0109 if (sqe->off || sqe->len || sqe->buf_index || sqe->splice_fd_in)
0110 return -EINVAL;
0111 if (unlikely(req->flags & REQ_F_FIXED_FILE))
0112 return -EBADF;
0113
0114 un->dfd = READ_ONCE(sqe->fd);
0115
0116 un->flags = READ_ONCE(sqe->unlink_flags);
0117 if (un->flags & ~AT_REMOVEDIR)
0118 return -EINVAL;
0119
0120 fname = u64_to_user_ptr(READ_ONCE(sqe->addr));
0121 un->filename = getname(fname);
0122 if (IS_ERR(un->filename))
0123 return PTR_ERR(un->filename);
0124
0125 req->flags |= REQ_F_NEED_CLEANUP;
0126 return 0;
0127 }
0128
0129 int io_unlinkat(struct io_kiocb *req, unsigned int issue_flags)
0130 {
0131 struct io_unlink *un = io_kiocb_to_cmd(req, struct io_unlink);
0132 int ret;
0133
0134 if (issue_flags & IO_URING_F_NONBLOCK)
0135 return -EAGAIN;
0136
0137 if (un->flags & AT_REMOVEDIR)
0138 ret = do_rmdir(un->dfd, un->filename);
0139 else
0140 ret = do_unlinkat(un->dfd, un->filename);
0141
0142 req->flags &= ~REQ_F_NEED_CLEANUP;
0143 io_req_set_res(req, ret, 0);
0144 return IOU_OK;
0145 }
0146
0147 void io_unlinkat_cleanup(struct io_kiocb *req)
0148 {
0149 struct io_unlink *ul = io_kiocb_to_cmd(req, struct io_unlink);
0150
0151 putname(ul->filename);
0152 }
0153
0154 int io_mkdirat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
0155 {
0156 struct io_mkdir *mkd = io_kiocb_to_cmd(req, struct io_mkdir);
0157 const char __user *fname;
0158
0159 if (sqe->off || sqe->rw_flags || sqe->buf_index || sqe->splice_fd_in)
0160 return -EINVAL;
0161 if (unlikely(req->flags & REQ_F_FIXED_FILE))
0162 return -EBADF;
0163
0164 mkd->dfd = READ_ONCE(sqe->fd);
0165 mkd->mode = READ_ONCE(sqe->len);
0166
0167 fname = u64_to_user_ptr(READ_ONCE(sqe->addr));
0168 mkd->filename = getname(fname);
0169 if (IS_ERR(mkd->filename))
0170 return PTR_ERR(mkd->filename);
0171
0172 req->flags |= REQ_F_NEED_CLEANUP;
0173 return 0;
0174 }
0175
0176 int io_mkdirat(struct io_kiocb *req, unsigned int issue_flags)
0177 {
0178 struct io_mkdir *mkd = io_kiocb_to_cmd(req, struct io_mkdir);
0179 int ret;
0180
0181 if (issue_flags & IO_URING_F_NONBLOCK)
0182 return -EAGAIN;
0183
0184 ret = do_mkdirat(mkd->dfd, mkd->filename, mkd->mode);
0185
0186 req->flags &= ~REQ_F_NEED_CLEANUP;
0187 io_req_set_res(req, ret, 0);
0188 return IOU_OK;
0189 }
0190
0191 void io_mkdirat_cleanup(struct io_kiocb *req)
0192 {
0193 struct io_mkdir *md = io_kiocb_to_cmd(req, struct io_mkdir);
0194
0195 putname(md->filename);
0196 }
0197
0198 int io_symlinkat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
0199 {
0200 struct io_link *sl = io_kiocb_to_cmd(req, struct io_link);
0201 const char __user *oldpath, *newpath;
0202
0203 if (sqe->len || sqe->rw_flags || sqe->buf_index || sqe->splice_fd_in)
0204 return -EINVAL;
0205 if (unlikely(req->flags & REQ_F_FIXED_FILE))
0206 return -EBADF;
0207
0208 sl->new_dfd = READ_ONCE(sqe->fd);
0209 oldpath = u64_to_user_ptr(READ_ONCE(sqe->addr));
0210 newpath = u64_to_user_ptr(READ_ONCE(sqe->addr2));
0211
0212 sl->oldpath = getname(oldpath);
0213 if (IS_ERR(sl->oldpath))
0214 return PTR_ERR(sl->oldpath);
0215
0216 sl->newpath = getname(newpath);
0217 if (IS_ERR(sl->newpath)) {
0218 putname(sl->oldpath);
0219 return PTR_ERR(sl->newpath);
0220 }
0221
0222 req->flags |= REQ_F_NEED_CLEANUP;
0223 return 0;
0224 }
0225
0226 int io_symlinkat(struct io_kiocb *req, unsigned int issue_flags)
0227 {
0228 struct io_link *sl = io_kiocb_to_cmd(req, struct io_link);
0229 int ret;
0230
0231 if (issue_flags & IO_URING_F_NONBLOCK)
0232 return -EAGAIN;
0233
0234 ret = do_symlinkat(sl->oldpath, sl->new_dfd, sl->newpath);
0235
0236 req->flags &= ~REQ_F_NEED_CLEANUP;
0237 io_req_set_res(req, ret, 0);
0238 return IOU_OK;
0239 }
0240
0241 int io_linkat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
0242 {
0243 struct io_link *lnk = io_kiocb_to_cmd(req, struct io_link);
0244 const char __user *oldf, *newf;
0245
0246 if (sqe->rw_flags || sqe->buf_index || sqe->splice_fd_in)
0247 return -EINVAL;
0248 if (unlikely(req->flags & REQ_F_FIXED_FILE))
0249 return -EBADF;
0250
0251 lnk->old_dfd = READ_ONCE(sqe->fd);
0252 lnk->new_dfd = READ_ONCE(sqe->len);
0253 oldf = u64_to_user_ptr(READ_ONCE(sqe->addr));
0254 newf = u64_to_user_ptr(READ_ONCE(sqe->addr2));
0255 lnk->flags = READ_ONCE(sqe->hardlink_flags);
0256
0257 lnk->oldpath = getname(oldf);
0258 if (IS_ERR(lnk->oldpath))
0259 return PTR_ERR(lnk->oldpath);
0260
0261 lnk->newpath = getname(newf);
0262 if (IS_ERR(lnk->newpath)) {
0263 putname(lnk->oldpath);
0264 return PTR_ERR(lnk->newpath);
0265 }
0266
0267 req->flags |= REQ_F_NEED_CLEANUP;
0268 return 0;
0269 }
0270
0271 int io_linkat(struct io_kiocb *req, unsigned int issue_flags)
0272 {
0273 struct io_link *lnk = io_kiocb_to_cmd(req, struct io_link);
0274 int ret;
0275
0276 if (issue_flags & IO_URING_F_NONBLOCK)
0277 return -EAGAIN;
0278
0279 ret = do_linkat(lnk->old_dfd, lnk->oldpath, lnk->new_dfd,
0280 lnk->newpath, lnk->flags);
0281
0282 req->flags &= ~REQ_F_NEED_CLEANUP;
0283 io_req_set_res(req, ret, 0);
0284 return IOU_OK;
0285 }
0286
0287 void io_link_cleanup(struct io_kiocb *req)
0288 {
0289 struct io_link *sl = io_kiocb_to_cmd(req, struct io_link);
0290
0291 putname(sl->oldpath);
0292 putname(sl->newpath);
0293 }
