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fs: remove __vfs_read

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Fold it into the two callers.

Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Christoph Hellwig 2020-05-08 11:17:46 +02:00
parent 6209dd9132
commit 775802c057
2 changed files with 21 additions and 23 deletions
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43
fs/read_write.c
View File

@ -419,17 +419,6 @@ static ssize_t new_sync_read(struct file *filp, char __user *buf, size_t len, lo
return ret;
}
ssize_t __vfs_read(struct file *file, char __user *buf, size_t count,
loff_t *pos)
{
if (file->f_op->read)
return file->f_op->read(file, buf, count, pos);
else if (file->f_op->read_iter)
return new_sync_read(file, buf, count, pos);
else
return -EINVAL;
}
ssize_t __kernel_read(struct file *file, void *buf, size_t count, loff_t *pos)
{
mm_segment_t old_fs = get_fs();
@ -443,7 +432,12 @@ ssize_t __kernel_read(struct file *file, void *buf, size_t count, loff_t *pos)
if (count > MAX_RW_COUNT)
count = MAX_RW_COUNT;
set_fs(KERNEL_DS);
ret = __vfs_read(file, (void __user *)buf, count, pos);
if (file->f_op->read)
ret = file->f_op->read(file, (void __user *)buf, count, pos);
else if (file->f_op->read_iter)
ret = new_sync_read(file, (void __user *)buf, count, pos);
else
ret = -EINVAL;
set_fs(old_fs);
if (ret > 0) {
fsnotify_access(file);
@ -476,17 +470,22 @@ ssize_t vfs_read(struct file *file, char __user *buf, size_t count, loff_t *pos)
return -EFAULT;
ret = rw_verify_area(READ, file, pos, count);
if (!ret) {
if (count > MAX_RW_COUNT)
count = MAX_RW_COUNT;
ret = __vfs_read(file, buf, count, pos);
if (ret > 0) {
fsnotify_access(file);
add_rchar(current, ret);
}
inc_syscr(current);
}
if (ret)
return ret;
if (count > MAX_RW_COUNT)
count = MAX_RW_COUNT;
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);
else
ret = -EINVAL;
if (ret > 0) {
fsnotify_access(file);
add_rchar(current, ret);
}
inc_syscr(current);
return ret;
}

1
include/linux/fs.h
View File

@ -1917,7 +1917,6 @@ ssize_t rw_copy_check_uvector(int type, const struct iovec __user * uvector,
struct iovec *fast_pointer,
struct iovec **ret_pointer);
extern ssize_t __vfs_read(struct file *, char __user *, size_t, loff_t *);
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 *);
extern ssize_t vfs_readv(struct file *, const struct iovec __user *,