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-rw-r--r--fs/proc/inode.c119
1 files changed, 83 insertions, 36 deletions
diff --git a/fs/proc/inode.c b/fs/proc/inode.c
index 28d6105e908e..58c075e2a452 100644
--- a/fs/proc/inode.c
+++ b/fs/proc/inode.c
@@ -297,6 +297,21 @@ static loff_t proc_reg_llseek(struct file *file, loff_t offset, int whence)
return rv;
}
+static ssize_t proc_reg_read_iter(struct kiocb *iocb, struct iov_iter *iter)
+{
+ struct proc_dir_entry *pde = PDE(file_inode(iocb->ki_filp));
+ ssize_t ret;
+
+ if (pde_is_permanent(pde))
+ return pde->proc_ops->proc_read_iter(iocb, iter);
+
+ if (!use_pde(pde))
+ return -EIO;
+ ret = pde->proc_ops->proc_read_iter(iocb, iter);
+ unuse_pde(pde);
+ return ret;
+}
+
static ssize_t pde_read(struct proc_dir_entry *pde, struct file *file, char __user *buf, size_t count, loff_t *ppos)
{
typeof_member(struct proc_ops, proc_read) read;
@@ -572,9 +587,18 @@ static const struct file_operations proc_reg_file_ops = {
.write = proc_reg_write,
.poll = proc_reg_poll,
.unlocked_ioctl = proc_reg_unlocked_ioctl,
-#ifdef CONFIG_COMPAT
- .compat_ioctl = proc_reg_compat_ioctl,
-#endif
+ .mmap = proc_reg_mmap,
+ .get_unmapped_area = proc_reg_get_unmapped_area,
+ .open = proc_reg_open,
+ .release = proc_reg_release,
+};
+
+static const struct file_operations proc_iter_file_ops = {
+ .llseek = proc_reg_llseek,
+ .read_iter = proc_reg_read_iter,
+ .write = proc_reg_write,
+ .poll = proc_reg_poll,
+ .unlocked_ioctl = proc_reg_unlocked_ioctl,
.mmap = proc_reg_mmap,
.get_unmapped_area = proc_reg_get_unmapped_area,
.open = proc_reg_open,
@@ -582,12 +606,26 @@ static const struct file_operations proc_reg_file_ops = {
};
#ifdef CONFIG_COMPAT
-static const struct file_operations proc_reg_file_ops_no_compat = {
+static const struct file_operations proc_reg_file_ops_compat = {
.llseek = proc_reg_llseek,
.read = proc_reg_read,
.write = proc_reg_write,
.poll = proc_reg_poll,
.unlocked_ioctl = proc_reg_unlocked_ioctl,
+ .compat_ioctl = proc_reg_compat_ioctl,
+ .mmap = proc_reg_mmap,
+ .get_unmapped_area = proc_reg_get_unmapped_area,
+ .open = proc_reg_open,
+ .release = proc_reg_release,
+};
+
+static const struct file_operations proc_iter_file_ops_compat = {
+ .llseek = proc_reg_llseek,
+ .read_iter = proc_reg_read_iter,
+ .write = proc_reg_write,
+ .poll = proc_reg_poll,
+ .unlocked_ioctl = proc_reg_unlocked_ioctl,
+ .compat_ioctl = proc_reg_compat_ioctl,
.mmap = proc_reg_mmap,
.get_unmapped_area = proc_reg_get_unmapped_area,
.open = proc_reg_open,
@@ -619,42 +657,51 @@ struct inode *proc_get_inode(struct super_block *sb, struct proc_dir_entry *de)
{
struct inode *inode = new_inode(sb);
- if (inode) {
- inode->i_ino = de->low_ino;
- inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode);
- PROC_I(inode)->pde = de;
+ if (!inode) {
+ pde_put(de);
+ return NULL;
+ }
- if (is_empty_pde(de)) {
- make_empty_dir_inode(inode);
- return inode;
- }
- if (de->mode) {
- inode->i_mode = de->mode;
- inode->i_uid = de->uid;
- inode->i_gid = de->gid;
- }
- if (de->size)
- inode->i_size = de->size;
- if (de->nlink)
- set_nlink(inode, de->nlink);
+ inode->i_ino = de->low_ino;
+ inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode);
+ PROC_I(inode)->pde = de;
+ if (is_empty_pde(de)) {
+ make_empty_dir_inode(inode);
+ return inode;
+ }
- if (S_ISREG(inode->i_mode)) {
- inode->i_op = de->proc_iops;
+ if (de->mode) {
+ inode->i_mode = de->mode;
+ inode->i_uid = de->uid;
+ inode->i_gid = de->gid;
+ }
+ if (de->size)
+ inode->i_size = de->size;
+ if (de->nlink)
+ set_nlink(inode, de->nlink);
+
+ if (S_ISREG(inode->i_mode)) {
+ inode->i_op = de->proc_iops;
+ if (de->proc_ops->proc_read_iter)
+ inode->i_fop = &proc_iter_file_ops;
+ else
inode->i_fop = &proc_reg_file_ops;
#ifdef CONFIG_COMPAT
- if (!de->proc_ops->proc_compat_ioctl) {
- inode->i_fop = &proc_reg_file_ops_no_compat;
- }
+ if (de->proc_ops->proc_compat_ioctl) {
+ if (de->proc_ops->proc_read_iter)
+ inode->i_fop = &proc_iter_file_ops_compat;
+ else
+ inode->i_fop = &proc_reg_file_ops_compat;
+ }
#endif
- } else if (S_ISDIR(inode->i_mode)) {
- inode->i_op = de->proc_iops;
- inode->i_fop = de->proc_dir_ops;
- } else if (S_ISLNK(inode->i_mode)) {
- inode->i_op = de->proc_iops;
- inode->i_fop = NULL;
- } else
- BUG();
- } else
- pde_put(de);
+ } else if (S_ISDIR(inode->i_mode)) {
+ inode->i_op = de->proc_iops;
+ inode->i_fop = de->proc_dir_ops;
+ } else if (S_ISLNK(inode->i_mode)) {
+ inode->i_op = de->proc_iops;
+ inode->i_fop = NULL;
+ } else {
+ BUG();
+ }
return inode;
}