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Diffstat (limited to 'fs/read_write.c')
-rw-r--r--fs/read_write.c219
1 files changed, 159 insertions, 60 deletions
diff --git a/fs/read_write.c b/fs/read_write.c
index e3cd280b158..009d8542a88 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -25,11 +25,12 @@
typedef ssize_t (*io_fn_t)(struct file *, char __user *, size_t, loff_t *);
typedef ssize_t (*iov_fn_t)(struct kiocb *, const struct iovec *,
unsigned long, loff_t);
+typedef ssize_t (*iter_fn_t)(struct kiocb *, struct iov_iter *);
const struct file_operations generic_ro_fops = {
.llseek = generic_file_llseek,
- .read = do_sync_read,
- .aio_read = generic_file_aio_read,
+ .read = new_sync_read,
+ .read_iter = generic_file_read_iter,
.mmap = generic_file_readonly_mmap,
.splice_read = generic_file_splice_read,
};
@@ -257,17 +258,29 @@ loff_t vfs_llseek(struct file *file, loff_t offset, int whence)
fn = no_llseek;
if (file->f_mode & FMODE_LSEEK) {
- if (file->f_op && file->f_op->llseek)
+ if (file->f_op->llseek)
fn = file->f_op->llseek;
}
return fn(file, offset, whence);
}
EXPORT_SYMBOL(vfs_llseek);
+static inline struct fd fdget_pos(int fd)
+{
+ return __to_fd(__fdget_pos(fd));
+}
+
+static inline void fdput_pos(struct fd f)
+{
+ if (f.flags & FDPUT_POS_UNLOCK)
+ mutex_unlock(&f.file->f_pos_lock);
+ fdput(f);
+}
+
SYSCALL_DEFINE3(lseek, unsigned int, fd, off_t, offset, unsigned int, whence)
{
off_t retval;
- struct fd f = fdget(fd);
+ struct fd f = fdget_pos(fd);
if (!f.file)
return -EBADF;
@@ -278,7 +291,7 @@ SYSCALL_DEFINE3(lseek, unsigned int, fd, off_t, offset, unsigned int, whence)
if (res != (loff_t)retval)
retval = -EOVERFLOW; /* LFS: should only happen on 32 bit platforms */
}
- fdput(f);
+ fdput_pos(f);
return retval;
}
@@ -295,7 +308,7 @@ SYSCALL_DEFINE5(llseek, unsigned int, fd, unsigned long, offset_high,
unsigned int, whence)
{
int retval;
- struct fd f = fdget(fd);
+ struct fd f = fdget_pos(fd);
loff_t offset;
if (!f.file)
@@ -315,7 +328,7 @@ SYSCALL_DEFINE5(llseek, unsigned int, fd, unsigned long, offset_high,
retval = 0;
}
out_putf:
- fdput(f);
+ fdput_pos(f);
return retval;
}
#endif
@@ -378,13 +391,34 @@ ssize_t do_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *pp
EXPORT_SYMBOL(do_sync_read);
+ssize_t new_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos)
+{
+ struct iovec iov = { .iov_base = buf, .iov_len = len };
+ struct kiocb kiocb;
+ struct iov_iter iter;
+ ssize_t ret;
+
+ init_sync_kiocb(&kiocb, filp);
+ kiocb.ki_pos = *ppos;
+ kiocb.ki_nbytes = len;
+ iov_iter_init(&iter, READ, &iov, 1, len);
+
+ ret = filp->f_op->read_iter(&kiocb, &iter);
+ if (-EIOCBQUEUED == ret)
+ ret = wait_on_sync_kiocb(&kiocb);
+ *ppos = kiocb.ki_pos;
+ return ret;
+}
+
+EXPORT_SYMBOL(new_sync_read);
+
ssize_t vfs_read(struct file *file, char __user *buf, size_t count, loff_t *pos)
{
ssize_t ret;
if (!(file->f_mode & FMODE_READ))
return -EBADF;
- if (!file->f_op || (!file->f_op->read && !file->f_op->aio_read))
+ if (!(file->f_mode & FMODE_CAN_READ))
return -EINVAL;
if (unlikely(!access_ok(VERIFY_WRITE, buf, count)))
return -EFAULT;
@@ -394,8 +428,10 @@ ssize_t vfs_read(struct file *file, char __user *buf, size_t count, loff_t *pos)
count = ret;
if (file->f_op->read)
ret = file->f_op->read(file, buf, count, pos);
- else
+ else if (file->f_op->aio_read)
ret = do_sync_read(file, buf, count, pos);
+ else
+ ret = new_sync_read(file, buf, count, pos);
if (ret > 0) {
fsnotify_access(file);
add_rchar(current, ret);
@@ -427,13 +463,34 @@ ssize_t do_sync_write(struct file *filp, const char __user *buf, size_t len, lof
EXPORT_SYMBOL(do_sync_write);
+ssize_t new_sync_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos)
+{
+ struct iovec iov = { .iov_base = (void __user *)buf, .iov_len = len };
+ struct kiocb kiocb;
+ struct iov_iter iter;
+ ssize_t ret;
+
+ init_sync_kiocb(&kiocb, filp);
+ kiocb.ki_pos = *ppos;
+ kiocb.ki_nbytes = len;
+ iov_iter_init(&iter, WRITE, &iov, 1, len);
+
+ ret = filp->f_op->write_iter(&kiocb, &iter);
+ if (-EIOCBQUEUED == ret)
+ ret = wait_on_sync_kiocb(&kiocb);
+ *ppos = kiocb.ki_pos;
+ return ret;
+}
+
+EXPORT_SYMBOL(new_sync_write);
+
ssize_t __kernel_write(struct file *file, const char *buf, size_t count, loff_t *pos)
{
mm_segment_t old_fs;
const char __user *p;
ssize_t ret;
- if (!file->f_op || (!file->f_op->write && !file->f_op->aio_write))
+ if (!(file->f_mode & FMODE_CAN_WRITE))
return -EINVAL;
old_fs = get_fs();
@@ -443,8 +500,10 @@ ssize_t __kernel_write(struct file *file, const char *buf, size_t count, loff_t
count = MAX_RW_COUNT;
if (file->f_op->write)
ret = file->f_op->write(file, p, count, pos);
- else
+ else if (file->f_op->aio_write)
ret = do_sync_write(file, p, count, pos);
+ else
+ ret = new_sync_write(file, p, count, pos);
set_fs(old_fs);
if (ret > 0) {
fsnotify_modify(file);
@@ -460,7 +519,7 @@ ssize_t vfs_write(struct file *file, const char __user *buf, size_t count, loff_
if (!(file->f_mode & FMODE_WRITE))
return -EBADF;
- if (!file->f_op || (!file->f_op->write && !file->f_op->aio_write))
+ if (!(file->f_mode & FMODE_CAN_WRITE))
return -EINVAL;
if (unlikely(!access_ok(VERIFY_READ, buf, count)))
return -EFAULT;
@@ -471,8 +530,10 @@ ssize_t vfs_write(struct file *file, const char __user *buf, size_t count, loff_
file_start_write(file);
if (file->f_op->write)
ret = file->f_op->write(file, buf, count, pos);
- else
+ else if (file->f_op->aio_write)
ret = do_sync_write(file, buf, count, pos);
+ else
+ ret = new_sync_write(file, buf, count, pos);
if (ret > 0) {
fsnotify_modify(file);
add_wchar(current, ret);
@@ -498,7 +559,7 @@ static inline void file_pos_write(struct file *file, loff_t pos)
SYSCALL_DEFINE3(read, unsigned int, fd, char __user *, buf, size_t, count)
{
- struct fd f = fdget(fd);
+ struct fd f = fdget_pos(fd);
ssize_t ret = -EBADF;
if (f.file) {
@@ -506,7 +567,7 @@ SYSCALL_DEFINE3(read, unsigned int, fd, char __user *, buf, size_t, count)
ret = vfs_read(f.file, buf, count, &pos);
if (ret >= 0)
file_pos_write(f.file, pos);
- fdput(f);
+ fdput_pos(f);
}
return ret;
}
@@ -514,7 +575,7 @@ SYSCALL_DEFINE3(read, unsigned int, fd, char __user *, buf, size_t, count)
SYSCALL_DEFINE3(write, unsigned int, fd, const char __user *, buf,
size_t, count)
{
- struct fd f = fdget(fd);
+ struct fd f = fdget_pos(fd);
ssize_t ret = -EBADF;
if (f.file) {
@@ -522,7 +583,7 @@ SYSCALL_DEFINE3(write, unsigned int, fd, const char __user *, buf,
ret = vfs_write(f.file, buf, count, &pos);
if (ret >= 0)
file_pos_write(f.file, pos);
- fdput(f);
+ fdput_pos(f);
}
return ret;
@@ -589,6 +650,25 @@ unsigned long iov_shorten(struct iovec *iov, unsigned long nr_segs, size_t to)
}
EXPORT_SYMBOL(iov_shorten);
+static ssize_t do_iter_readv_writev(struct file *filp, int rw, const struct iovec *iov,
+ unsigned long nr_segs, size_t len, loff_t *ppos, iter_fn_t fn)
+{
+ struct kiocb kiocb;
+ struct iov_iter iter;
+ ssize_t ret;
+
+ init_sync_kiocb(&kiocb, filp);
+ kiocb.ki_pos = *ppos;
+ kiocb.ki_nbytes = len;
+
+ iov_iter_init(&iter, rw, iov, nr_segs, len);
+ ret = fn(&kiocb, &iter);
+ if (ret == -EIOCBQUEUED)
+ ret = wait_on_sync_kiocb(&kiocb);
+ *ppos = kiocb.ki_pos;
+ return ret;
+}
+
static ssize_t do_sync_readv_writev(struct file *filp, const struct iovec *iov,
unsigned long nr_segs, size_t len, loff_t *ppos, iov_fn_t fn)
{
@@ -726,11 +806,7 @@ static ssize_t do_readv_writev(int type, struct file *file,
ssize_t ret;
io_fn_t fn;
iov_fn_t fnv;
-
- if (!file->f_op) {
- ret = -EINVAL;
- goto out;
- }
+ iter_fn_t iter_fn;
ret = rw_copy_check_uvector(type, uvector, nr_segs,
ARRAY_SIZE(iovstack), iovstack, &iov);
@@ -746,13 +822,18 @@ static ssize_t do_readv_writev(int type, struct file *file,
if (type == READ) {
fn = file->f_op->read;
fnv = file->f_op->aio_read;
+ iter_fn = file->f_op->read_iter;
} else {
fn = (io_fn_t)file->f_op->write;
fnv = file->f_op->aio_write;
+ iter_fn = file->f_op->write_iter;
file_start_write(file);
}
- if (fnv)
+ if (iter_fn)
+ ret = do_iter_readv_writev(file, type, iov, nr_segs, tot_len,
+ pos, iter_fn);
+ else if (fnv)
ret = do_sync_readv_writev(file, iov, nr_segs, tot_len,
pos, fnv);
else
@@ -778,7 +859,7 @@ ssize_t vfs_readv(struct file *file, const struct iovec __user *vec,
{
if (!(file->f_mode & FMODE_READ))
return -EBADF;
- if (!file->f_op || (!file->f_op->aio_read && !file->f_op->read))
+ if (!(file->f_mode & FMODE_CAN_READ))
return -EINVAL;
return do_readv_writev(READ, file, vec, vlen, pos);
@@ -791,7 +872,7 @@ ssize_t vfs_writev(struct file *file, const struct iovec __user *vec,
{
if (!(file->f_mode & FMODE_WRITE))
return -EBADF;
- if (!file->f_op || (!file->f_op->aio_write && !file->f_op->write))
+ if (!(file->f_mode & FMODE_CAN_WRITE))
return -EINVAL;
return do_readv_writev(WRITE, file, vec, vlen, pos);
@@ -802,7 +883,7 @@ EXPORT_SYMBOL(vfs_writev);
SYSCALL_DEFINE3(readv, unsigned long, fd, const struct iovec __user *, vec,
unsigned long, vlen)
{
- struct fd f = fdget(fd);
+ struct fd f = fdget_pos(fd);
ssize_t ret = -EBADF;
if (f.file) {
@@ -810,7 +891,7 @@ SYSCALL_DEFINE3(readv, unsigned long, fd, const struct iovec __user *, vec,
ret = vfs_readv(f.file, vec, vlen, &pos);
if (ret >= 0)
file_pos_write(f.file, pos);
- fdput(f);
+ fdput_pos(f);
}
if (ret > 0)
@@ -822,7 +903,7 @@ SYSCALL_DEFINE3(readv, unsigned long, fd, const struct iovec __user *, vec,
SYSCALL_DEFINE3(writev, unsigned long, fd, const struct iovec __user *, vec,
unsigned long, vlen)
{
- struct fd f = fdget(fd);
+ struct fd f = fdget_pos(fd);
ssize_t ret = -EBADF;
if (f.file) {
@@ -830,7 +911,7 @@ SYSCALL_DEFINE3(writev, unsigned long, fd, const struct iovec __user *, vec,
ret = vfs_writev(f.file, vec, vlen, &pos);
if (ret >= 0)
file_pos_write(f.file, pos);
- fdput(f);
+ fdput_pos(f);
}
if (ret > 0)
@@ -905,14 +986,7 @@ static ssize_t compat_do_readv_writev(int type, struct file *file,
ssize_t ret;
io_fn_t fn;
iov_fn_t fnv;
-
- ret = -EINVAL;
- if (!file->f_op)
- goto out;
-
- ret = -EFAULT;
- if (!access_ok(VERIFY_READ, uvector, nr_segs*sizeof(*uvector)))
- goto out;
+ iter_fn_t iter_fn;
ret = compat_rw_copy_check_uvector(type, uvector, nr_segs,
UIO_FASTIOV, iovstack, &iov);
@@ -928,13 +1002,18 @@ static ssize_t compat_do_readv_writev(int type, struct file *file,
if (type == READ) {
fn = file->f_op->read;
fnv = file->f_op->aio_read;
+ iter_fn = file->f_op->read_iter;
} else {
fn = (io_fn_t)file->f_op->write;
fnv = file->f_op->aio_write;
+ iter_fn = file->f_op->write_iter;
file_start_write(file);
}
- if (fnv)
+ if (iter_fn)
+ ret = do_iter_readv_writev(file, type, iov, nr_segs, tot_len,
+ pos, iter_fn);
+ else if (fnv)
ret = do_sync_readv_writev(file, iov, nr_segs, tot_len,
pos, fnv);
else
@@ -965,7 +1044,7 @@ static size_t compat_readv(struct file *file,
goto out;
ret = -EINVAL;
- if (!file->f_op || (!file->f_op->aio_read && !file->f_op->read))
+ if (!(file->f_mode & FMODE_CAN_READ))
goto out;
ret = compat_do_readv_writev(READ, file, vec, vlen, pos);
@@ -977,11 +1056,11 @@ out:
return ret;
}
-COMPAT_SYSCALL_DEFINE3(readv, unsigned long, fd,
+COMPAT_SYSCALL_DEFINE3(readv, compat_ulong_t, fd,
const struct compat_iovec __user *,vec,
- unsigned long, vlen)
+ compat_ulong_t, vlen)
{
- struct fd f = fdget(fd);
+ struct fd f = fdget_pos(fd);
ssize_t ret;
loff_t pos;
@@ -991,13 +1070,13 @@ COMPAT_SYSCALL_DEFINE3(readv, unsigned long, fd,
ret = compat_readv(f.file, vec, vlen, &pos);
if (ret >= 0)
f.file->f_pos = pos;
- fdput(f);
+ fdput_pos(f);
return ret;
}
-COMPAT_SYSCALL_DEFINE4(preadv64, unsigned long, fd,
- const struct compat_iovec __user *,vec,
- unsigned long, vlen, loff_t, pos)
+static long __compat_sys_preadv64(unsigned long fd,
+ const struct compat_iovec __user *vec,
+ unsigned long vlen, loff_t pos)
{
struct fd f;
ssize_t ret;
@@ -1014,12 +1093,22 @@ COMPAT_SYSCALL_DEFINE4(preadv64, unsigned long, fd,
return ret;
}
-COMPAT_SYSCALL_DEFINE5(preadv, unsigned long, fd,
+#ifdef __ARCH_WANT_COMPAT_SYS_PREADV64
+COMPAT_SYSCALL_DEFINE4(preadv64, unsigned long, fd,
const struct compat_iovec __user *,vec,
- unsigned long, vlen, u32, pos_low, u32, pos_high)
+ unsigned long, vlen, loff_t, pos)
+{
+ return __compat_sys_preadv64(fd, vec, vlen, pos);
+}
+#endif
+
+COMPAT_SYSCALL_DEFINE5(preadv, compat_ulong_t, fd,
+ const struct compat_iovec __user *,vec,
+ compat_ulong_t, vlen, u32, pos_low, u32, pos_high)
{
loff_t pos = ((loff_t)pos_high << 32) | pos_low;
- return compat_sys_preadv64(fd, vec, vlen, pos);
+
+ return __compat_sys_preadv64(fd, vec, vlen, pos);
}
static size_t compat_writev(struct file *file,
@@ -1032,7 +1121,7 @@ static size_t compat_writev(struct file *file,
goto out;
ret = -EINVAL;
- if (!file->f_op || (!file->f_op->aio_write && !file->f_op->write))
+ if (!(file->f_mode & FMODE_CAN_WRITE))
goto out;
ret = compat_do_readv_writev(WRITE, file, vec, vlen, pos);
@@ -1044,11 +1133,11 @@ out:
return ret;
}
-COMPAT_SYSCALL_DEFINE3(writev, unsigned long, fd,
+COMPAT_SYSCALL_DEFINE3(writev, compat_ulong_t, fd,
const struct compat_iovec __user *, vec,
- unsigned long, vlen)
+ compat_ulong_t, vlen)
{
- struct fd f = fdget(fd);
+ struct fd f = fdget_pos(fd);
ssize_t ret;
loff_t pos;
@@ -1058,13 +1147,13 @@ COMPAT_SYSCALL_DEFINE3(writev, unsigned long, fd,
ret = compat_writev(f.file, vec, vlen, &pos);
if (ret >= 0)
f.file->f_pos = pos;
- fdput(f);
+ fdput_pos(f);
return ret;
}
-COMPAT_SYSCALL_DEFINE4(pwritev64, unsigned long, fd,
- const struct compat_iovec __user *,vec,
- unsigned long, vlen, loff_t, pos)
+static long __compat_sys_pwritev64(unsigned long fd,
+ const struct compat_iovec __user *vec,
+ unsigned long vlen, loff_t pos)
{
struct fd f;
ssize_t ret;
@@ -1081,12 +1170,22 @@ COMPAT_SYSCALL_DEFINE4(pwritev64, unsigned long, fd,
return ret;
}
-COMPAT_SYSCALL_DEFINE5(pwritev, unsigned long, fd,
+#ifdef __ARCH_WANT_COMPAT_SYS_PWRITEV64
+COMPAT_SYSCALL_DEFINE4(pwritev64, unsigned long, fd,
+ const struct compat_iovec __user *,vec,
+ unsigned long, vlen, loff_t, pos)
+{
+ return __compat_sys_pwritev64(fd, vec, vlen, pos);
+}
+#endif
+
+COMPAT_SYSCALL_DEFINE5(pwritev, compat_ulong_t, fd,
const struct compat_iovec __user *,vec,
- unsigned long, vlen, u32, pos_low, u32, pos_high)
+ compat_ulong_t, vlen, u32, pos_low, u32, pos_high)
{
loff_t pos = ((loff_t)pos_high << 32) | pos_low;
- return compat_sys_pwritev64(fd, vec, vlen, pos);
+
+ return __compat_sys_pwritev64(fd, vec, vlen, pos);
}
#endif
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-04 13:25:09 +0000