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authorLinus Torvalds <torvalds@linux-foundation.org>2017-09-15 04:13:32 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2017-09-15 04:13:32 +0300
commit581bfce969cbfc7ce43ee92273be9cb7c3fdfa61 (patch)
tree0a693778ce39c49b9b7d93d0d6795c576896f5cf /fs/read_write.c
parentcc73fee0bae2d66594d1fa2df92bbd783aa98e04 (diff)
parent9725d4cef62229b4ec4c912e0db0761e7d400650 (diff)
downloadlinux-581bfce969cbfc7ce43ee92273be9cb7c3fdfa61.tar.xz
Merge branch 'work.set_fs' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Pull more set_fs removal from Al Viro: "Christoph's 'use kernel_read and friends rather than open-coding set_fs()' series" * 'work.set_fs' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: fs: unexport vfs_readv and vfs_writev fs: unexport vfs_read and vfs_write fs: unexport __vfs_read/__vfs_write lustre: switch to kernel_write gadget/f_mass_storage: stop messing with the address limit mconsole: switch to kernel_read btrfs: switch write_buf to kernel_write net/9p: switch p9_fd_read to kernel_write mm/nommu: switch do_mmap_private to kernel_read serial2002: switch serial2002_tty_write to kernel_{read/write} fs: make the buf argument to __kernel_write a void pointer fs: fix kernel_write prototype fs: fix kernel_read prototype fs: move kernel_read to fs/read_write.c fs: move kernel_write to fs/read_write.c autofs4: switch autofs4_write to __kernel_write ashmem: switch to ->read_iter
Diffstat (limited to 'fs/read_write.c')
-rw-r--r--fs/read_write.c43
1 files changed, 32 insertions, 11 deletions
diff --git a/fs/read_write.c b/fs/read_write.c
index 61b58c7b6531..a2b9a47235c5 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -413,7 +413,20 @@ ssize_t __vfs_read(struct file *file, char __user *buf, size_t count,
else
return -EINVAL;
}
-EXPORT_SYMBOL(__vfs_read);
+
+ssize_t kernel_read(struct file *file, void *buf, size_t count, loff_t *pos)
+{
+ mm_segment_t old_fs;
+ ssize_t result;
+
+ old_fs = get_fs();
+ set_fs(get_ds());
+ /* The cast to a user pointer is valid due to the set_fs() */
+ result = vfs_read(file, (void __user *)buf, count, pos);
+ set_fs(old_fs);
+ return result;
+}
+EXPORT_SYMBOL(kernel_read);
ssize_t vfs_read(struct file *file, char __user *buf, size_t count, loff_t *pos)
{
@@ -441,8 +454,6 @@ ssize_t vfs_read(struct file *file, char __user *buf, size_t count, loff_t *pos)
return ret;
}
-EXPORT_SYMBOL(vfs_read);
-
static 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 };
@@ -471,9 +482,8 @@ ssize_t __vfs_write(struct file *file, const char __user *p, size_t count,
else
return -EINVAL;
}
-EXPORT_SYMBOL(__vfs_write);
-ssize_t __kernel_write(struct file *file, const char *buf, size_t count, loff_t *pos)
+ssize_t __kernel_write(struct file *file, const void *buf, size_t count, loff_t *pos)
{
mm_segment_t old_fs;
const char __user *p;
@@ -496,9 +506,24 @@ ssize_t __kernel_write(struct file *file, const char *buf, size_t count, loff_t
inc_syscw(current);
return ret;
}
-
EXPORT_SYMBOL(__kernel_write);
+ssize_t kernel_write(struct file *file, const void *buf, size_t count,
+ loff_t *pos)
+{
+ mm_segment_t old_fs;
+ ssize_t res;
+
+ old_fs = get_fs();
+ set_fs(get_ds());
+ /* The cast to a user pointer is valid due to the set_fs() */
+ res = vfs_write(file, (__force const char __user *)buf, count, pos);
+ set_fs(old_fs);
+
+ return res;
+}
+EXPORT_SYMBOL(kernel_write);
+
ssize_t vfs_write(struct file *file, const char __user *buf, size_t count, loff_t *pos)
{
ssize_t ret;
@@ -527,8 +552,6 @@ ssize_t vfs_write(struct file *file, const char __user *buf, size_t count, loff_
return ret;
}
-EXPORT_SYMBOL(vfs_write);
-
static inline loff_t file_pos_read(struct file *file)
{
return file->f_pos;
@@ -959,9 +982,8 @@ ssize_t vfs_readv(struct file *file, const struct iovec __user *vec,
return ret;
}
-EXPORT_SYMBOL(vfs_readv);
-ssize_t vfs_writev(struct file *file, const struct iovec __user *vec,
+static ssize_t vfs_writev(struct file *file, const struct iovec __user *vec,
unsigned long vlen, loff_t *pos, rwf_t flags)
{
struct iovec iovstack[UIO_FASTIOV];
@@ -978,7 +1000,6 @@ ssize_t vfs_writev(struct file *file, const struct iovec __user *vec,
}
return ret;
}
-EXPORT_SYMBOL(vfs_writev);
static ssize_t do_readv(unsigned long fd, const struct iovec __user *vec,
unsigned long vlen, rwf_t flags)