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Date: Fri, 25 Apr 2008 13:56:09 -0400
From: Jeff Dike <jdike@...toit.com>
To: Andrew Morton <akpm@...l.org>, LKML <linux-kernel@...r.kernel.org>,
uml-devel <user-mode-linux-devel@...ts.sourceforge.net>
Subject: [PATCH 6/19] UML - hppfs fixes
hppfs tidying and fixes noticed during hch's get_inode work -
style fixes
a copy_to_user got its return value checked
hppfs_write no longer fiddles file->f_pos because it gets and
returns pos in its arguments
hppfs_delete_inode dputs the underlyng procfs dentry stored in
its private data and mntputs the vfsmnt stashed in s_fs_info
hppfs_put_super no longer needs to mntput the s_fs_info, so it
no longer needs to exist
hppfs_readlink and hppfs_follow_link were doing a bunch of stuff
with a struct file which they didn't use
there is now a ->permission which calls generic_permission
get_inode was always returning 0 for some reason - it now
returns an inode if nothing bad happened
Signed-off-by: Jeff Dike <jdike@...ux.intel.com>
---
fs/hppfs/hppfs_kern.c | 82 ++++++++++++++++++--------------------------------
1 file changed, 30 insertions(+), 52 deletions(-)
Index: linux-2.6.22/fs/hppfs/hppfs_kern.c
===================================================================
--- linux-2.6.22.orig/fs/hppfs/hppfs_kern.c 2008-04-24 13:35:54.000000000 -0400
+++ linux-2.6.22/fs/hppfs/hppfs_kern.c 2008-04-24 15:31:59.000000000 -0400
@@ -33,7 +33,7 @@ struct hppfs_private {
};
struct hppfs_inode_info {
- struct dentry *proc_dentry;
+ struct dentry *proc_dentry;
struct inode vfs_inode;
};
@@ -52,7 +52,7 @@ static int is_pid(struct dentry *dentry)
int i;
sb = dentry->d_sb;
- if ((sb->s_op != &hppfs_sbops) || (dentry->d_parent != sb->s_root))
+ if (dentry->d_parent != sb->s_root)
return 0;
for (i = 0; i < dentry->d_name.len; i++) {
@@ -136,7 +136,7 @@ static int file_removed(struct dentry *d
}
static struct dentry *hppfs_lookup(struct inode *ino, struct dentry *dentry,
- struct nameidata *nd)
+ struct nameidata *nd)
{
struct dentry *proc_dentry, *new, *parent;
struct inode *inode;
@@ -254,6 +254,8 @@ static ssize_t hppfs_read(struct file *f
int err;
if (hppfs->contents != NULL) {
+ int rem;
+
if (*ppos >= hppfs->len)
return 0;
@@ -267,8 +269,10 @@ static ssize_t hppfs_read(struct file *f
if (off + count > hppfs->len)
count = hppfs->len - off;
- copy_to_user(buf, &data->contents[off], count);
- *ppos += count;
+ rem = copy_to_user(buf, &data->contents[off], count);
+ *ppos += count - rem;
+ if (rem > 0)
+ return -EFAULT;
} else if (hppfs->host_fd != -1) {
err = os_seek_file(hppfs->host_fd, *ppos);
if (err) {
@@ -285,21 +289,15 @@ static ssize_t hppfs_read(struct file *f
return count;
}
-static ssize_t hppfs_write(struct file *file, const char __user *buf, size_t len,
- loff_t *ppos)
+static ssize_t hppfs_write(struct file *file, const char __user *buf,
+ size_t len, loff_t *ppos)
{
struct hppfs_private *data = file->private_data;
struct file *proc_file = data->proc_file;
ssize_t (*write)(struct file *, const char __user *, size_t, loff_t *);
- int err;
write = proc_file->f_path.dentry->d_inode->i_fop->write;
-
- proc_file->f_pos = file->f_pos;
- err = (*write)(proc_file, buf, len, &proc_file->f_pos);
- file->f_pos = proc_file->f_pos;
-
- return err;
+ return (*write)(proc_file, buf, len, ppos);
}
static int open_host_sock(char *host_file, int *filter_out)
@@ -357,7 +355,7 @@ static struct hppfs_data *hppfs_get_data
if (filter) {
while ((n = read_proc(proc_file, data->contents,
- sizeof(data->contents), NULL, 0)) > 0)
+ sizeof(data->contents), NULL, 0)) > 0)
os_write_file(fd, data->contents, n);
err = os_shutdown_socket(fd, 0, 1);
if (err) {
@@ -429,8 +427,8 @@ static int file_mode(int fmode)
static int hppfs_open(struct inode *inode, struct file *file)
{
struct hppfs_private *data;
- struct dentry *proc_dentry;
struct vfsmount *proc_mnt;
+ struct dentry *proc_dentry;
char *host_file;
int err, fd, type, filter;
@@ -492,8 +490,8 @@ static int hppfs_open(struct inode *inod
static int hppfs_dir_open(struct inode *inode, struct file *file)
{
struct hppfs_private *data;
- struct dentry *proc_dentry;
struct vfsmount *proc_mnt;
+ struct dentry *proc_dentry;
int err;
err = -ENOMEM;
@@ -620,6 +618,9 @@ static struct inode *hppfs_alloc_inode(s
void hppfs_delete_inode(struct inode *ino)
{
+ dput(HPPFS_I(ino)->proc_dentry);
+ mntput(ino->i_sb->s_fs_info);
+
clear_inode(ino);
}
@@ -628,69 +629,46 @@ static void hppfs_destroy_inode(struct i
kfree(HPPFS_I(inode));
}
-static void hppfs_put_super(struct super_block *sb)
-{
- mntput(sb->s_fs_info);
-}
-
static const struct super_operations hppfs_sbops = {
.alloc_inode = hppfs_alloc_inode,
.destroy_inode = hppfs_destroy_inode,
.delete_inode = hppfs_delete_inode,
.statfs = hppfs_statfs,
- .put_super = hppfs_put_super,
};
static int hppfs_readlink(struct dentry *dentry, char __user *buffer,
int buflen)
{
- struct file *proc_file;
struct dentry *proc_dentry;
- struct vfsmount *proc_mnt;
- int ret;
proc_dentry = HPPFS_I(dentry->d_inode)->proc_dentry;
- proc_mnt = dentry->d_sb->s_fs_info;
-
- proc_file = dentry_open(dget(proc_dentry), mntget(proc_mnt), O_RDONLY);
- if (IS_ERR(proc_file))
- return PTR_ERR(proc_file);
-
- ret = proc_dentry->d_inode->i_op->readlink(proc_dentry, buffer, buflen);
-
- fput(proc_file);
-
- return ret;
+ return proc_dentry->d_inode->i_op->readlink(proc_dentry, buffer,
+ buflen);
}
-static void* hppfs_follow_link(struct dentry *dentry, struct nameidata *nd)
+static void *hppfs_follow_link(struct dentry *dentry, struct nameidata *nd)
{
- struct file *proc_file;
struct dentry *proc_dentry;
- struct vfsmount *proc_mnt;
- void *ret;
proc_dentry = HPPFS_I(dentry->d_inode)->proc_dentry;
- proc_mnt = dentry->d_sb->s_fs_info;
-
- proc_file = dentry_open(dget(proc_dentry), mntget(proc_mnt), O_RDONLY);
- if (IS_ERR(proc_file))
- return proc_file;
-
- ret = proc_dentry->d_inode->i_op->follow_link(proc_dentry, nd);
- fput(proc_file);
+ return proc_dentry->d_inode->i_op->follow_link(proc_dentry, nd);
+}
- return ret;
+int hppfs_permission(struct inode *inode, int mask, struct nameidata *nd)
+{
+ return generic_permission(inode, mask, NULL);
}
static const struct inode_operations hppfs_dir_iops = {
.lookup = hppfs_lookup,
+ .permission = hppfs_permission,
};
static const struct inode_operations hppfs_link_iops = {
.readlink = hppfs_readlink,
.follow_link = hppfs_follow_link,
+ .permission = hppfs_permission,
};
static struct inode *get_inode(struct super_block *sb, struct dentry *dentry)
@@ -712,7 +690,7 @@ static struct inode *get_inode(struct su
inode->i_fop = &hppfs_file_fops;
}
- HPPFS_I(inode)->proc_dentry = dentry;
+ HPPFS_I(inode)->proc_dentry = dget(dentry);
inode->i_uid = proc_ino->i_uid;
inode->i_gid = proc_ino->i_gid;
@@ -725,7 +703,7 @@ static struct inode *get_inode(struct su
inode->i_size = proc_ino->i_size;
inode->i_blocks = proc_ino->i_blocks;
- return 0;
+ return inode;
}
static int hppfs_fill_super(struct super_block *sb, void *d, int silent)
--
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