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Diffstat (limited to 'fs')
-rw-r--r--fs/file_table.c4
-rw-r--r--fs/open.c4
-rw-r--r--fs/read_write.c14
3 files changed, 15 insertions, 7 deletions
diff --git a/fs/file_table.c b/fs/file_table.c
index a374f5033e97..be73cbc48c12 100644
--- a/fs/file_table.c
+++ b/fs/file_table.c
@@ -175,6 +175,10 @@ struct file *alloc_file(struct path *path, fmode_t mode,
file->f_path = *path;
file->f_inode = path->dentry->d_inode;
file->f_mapping = path->dentry->d_inode->i_mapping;
+ if ((mode & FMODE_READ) && likely(fop->read || fop->aio_read))
+ mode |= FMODE_CAN_READ;
+ if ((mode & FMODE_WRITE) && likely(fop->write || fop->aio_write))
+ mode |= FMODE_CAN_WRITE;
file->f_mode = mode;
file->f_op = fop;
if ((mode & (FMODE_READ | FMODE_WRITE)) == FMODE_READ)
diff --git a/fs/open.c b/fs/open.c
index 9d64679cec73..39d3d0468ee6 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -725,6 +725,10 @@ static int do_dentry_open(struct file *f,
}
if ((f->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_READ)
i_readcount_inc(inode);
+ if ((f->f_mode & FMODE_READ) && likely(f->f_op->read || f->f_op->aio_read))
+ f->f_mode |= FMODE_CAN_READ;
+ if ((f->f_mode & FMODE_WRITE) && likely(f->f_op->write || f->f_op->aio_write))
+ f->f_mode |= FMODE_CAN_WRITE;
f->f_flags &= ~(O_CREAT | O_EXCL | O_NOCTTY | O_TRUNC);
diff --git a/fs/read_write.c b/fs/read_write.c
index 31c6efa43183..d29d2a361d2c 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -396,7 +396,7 @@ ssize_t vfs_read(struct file *file, char __user *buf, size_t count, loff_t *pos)
if (!(file->f_mode & FMODE_READ))
return -EBADF;
- if (!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;
@@ -445,7 +445,7 @@ ssize_t __kernel_write(struct file *file, const char *buf, size_t count, loff_t
const char __user *p;
ssize_t ret;
- if (!file->f_op->write && !file->f_op->aio_write)
+ if (!(file->f_mode & FMODE_CAN_WRITE))
return -EINVAL;
old_fs = get_fs();
@@ -472,7 +472,7 @@ 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->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;
@@ -785,7 +785,7 @@ ssize_t vfs_readv(struct file *file, const struct iovec __user *vec,
{
if (!(file->f_mode & FMODE_READ))
return -EBADF;
- if (!file->f_op->aio_read && !file->f_op->read)
+ if (!(file->f_mode & FMODE_CAN_READ))
return -EINVAL;
return do_readv_writev(READ, file, vec, vlen, pos);
@@ -798,7 +798,7 @@ ssize_t vfs_writev(struct file *file, const struct iovec __user *vec,
{
if (!(file->f_mode & FMODE_WRITE))
return -EBADF;
- if (!file->f_op->aio_write && !file->f_op->write)
+ if (!(file->f_mode & FMODE_CAN_WRITE))
return -EINVAL;
return do_readv_writev(WRITE, file, vec, vlen, pos);
@@ -964,7 +964,7 @@ static size_t compat_readv(struct file *file,
goto out;
ret = -EINVAL;
- if (!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);
@@ -1041,7 +1041,7 @@ static size_t compat_writev(struct file *file,
goto out;
ret = -EINVAL;
- if (!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);