static int amfs_unlink(struct inode *dir, struct dentry *dentry)
{
int err;
struct dentry *lower_dentry;
struct inode *lower_dir_inode = amfs_lower_inode(dir);
struct dentry *lower_dir_dentry;
struct path lower_path;
/*************Check if trying to delete pattern file**************/
if (dentry->d_inode->i_ino == AMFS_SB(dentry->d_sb)->inode_no) {
err = -EPERM;
goto out_err;
}
/* here I am not allowing user to delete pattern db file. This will only
* work if pattern db lies inside the directory which is being mounted
*/
/**********************XATTR ENDS HERE**************/
amfs_get_lower_path(dentry, &lower_path);
lower_dentry = lower_path.dentry;
dget(lower_dentry);
lower_dir_dentry = lock_parent(lower_dentry);
err = vfs_unlink(lower_dir_inode, lower_dentry, NULL);
/*
* Note: unlinking on top of NFS can cause silly-renamed files.
* Trying to delete such files results in EBUSY from NFS
* below. Silly-renamed files will get deleted by NFS later on, so
* we just need to detect them here and treat such EBUSY errors as
* if the upper file was successfully deleted.
*/
if (err == -EBUSY && lower_dentry->d_flags & DCACHE_NFSFS_RENAMED)
err = 0;
if (err)
goto out;
fsstack_copy_attr_times(dir, lower_dir_inode);
fsstack_copy_inode_size(dir, lower_dir_inode);
set_nlink(dentry->d_inode,
amfs_lower_inode(dentry->d_inode)->i_nlink);
dentry->d_inode->i_ctime = dir->i_ctime;
d_drop(dentry); /* this is needed, else LTP fails (VFS won't do it) */
out:
unlock_dir(lower_dir_dentry);
dput(lower_dentry);
amfs_put_lower_path(dentry, &lower_path);
out_err:
return err;
}
/* final actions when unmounting a file system */
static void amfs_put_super(struct super_block *sb)
{
struct amfs_sb_info *spd;
struct super_block *s;
struct pattern_item *temp_node = NULL;
struct bad_file_item *mtemp_node = NULL;
struct list_head *pos, *q;
struct list_head *mpos, *mq;
struct list_head *plist_head = NULL;
spd = AMFS_SB(sb);
if (!spd)
return;
plist_head = spd->pattern_list_head;
list_for_each_safe(pos, q, plist_head) {
temp_node = list_entry(pos, struct pattern_item, list);
list_del(pos);
kfree(temp_node);
}
static int amfs_link(struct dentry *old_dentry, struct inode *dir,
struct dentry *new_dentry)
{
struct dentry *lower_old_dentry;
struct dentry *lower_new_dentry;
struct dentry *lower_dir_dentry;
u64 file_size_save;
int err;
struct path lower_old_path, lower_new_path;
char *value = NULL;
if (old_dentry->d_inode->i_ino ==
AMFS_SB(old_dentry->d_sb)->inode_no) {
err = -EPERM;
goto out_err;
}
/************XATTR************/
value = kzalloc(5, __GFP_WAIT);
if (value == NULL) {
err = -ENOMEM;
goto out_err;
}
if (amfs_getxattr(old_dentry, AMFS_XATTR_NAME, value, 5) > 0) {
if (!strncmp(value, AMFS_BADFILE, 3)) {
err = -EPERM;
goto freevalue;
}
} else if (amfs_getxattr(old_dentry, AMFS_XATTR_NAME, value, 5)
!= -ENODATA){
err = amfs_getxattr(old_dentry, AMFS_XATTR_NAME, value, 5);
goto freevalue;
}
/************XATTR***********/
file_size_save = i_size_read(old_dentry->d_inode);
amfs_get_lower_path(old_dentry, &lower_old_path);
amfs_get_lower_path(new_dentry, &lower_new_path);
lower_old_dentry = lower_old_path.dentry;
lower_new_dentry = lower_new_path.dentry;
lower_dir_dentry = lock_parent(lower_new_dentry);
err = vfs_link(lower_old_dentry, lower_dir_dentry->d_inode,
lower_new_dentry, NULL);
if (err || !lower_new_dentry->d_inode)
goto out;
err = amfs_interpose(new_dentry, dir->i_sb, &lower_new_path);
if (err)
goto out;
fsstack_copy_attr_times(dir, lower_new_dentry->d_inode);
fsstack_copy_inode_size(dir, lower_new_dentry->d_inode);
set_nlink(old_dentry->d_inode,
amfs_lower_inode(old_dentry->d_inode)->i_nlink);
i_size_write(new_dentry->d_inode, file_size_save);
out:
unlock_dir(lower_dir_dentry);
amfs_put_lower_path(old_dentry, &lower_old_path);
amfs_put_lower_path(new_dentry, &lower_new_path);
freevalue:
kfree(value);
out_err:
return err;
}
/*
* The locking rules in amfs_rename are complex. We could use a simpler
* superblock-level name-space lock for renames and copy-ups.
*/
static int amfs_rename(struct inode *old_dir, struct dentry *old_dentry,
struct inode *new_dir, struct dentry *new_dentry)
{
int err = 0;
struct dentry *lower_old_dentry = NULL;
struct dentry *lower_new_dentry = NULL;
struct dentry *lower_old_dir_dentry = NULL;
struct dentry *lower_new_dir_dentry = NULL;
struct dentry *trap = NULL;
struct path lower_old_path, lower_new_path;
/*******Variable which will help in checking XATTR***************/
char *value = NULL;
if (old_dentry->d_inode->i_ino ==
AMFS_SB(old_dentry->d_sb)->inode_no) {
err = -EPERM;
goto exitcode;
}
value = kzalloc(5, __GFP_WAIT);
if (value == NULL) {
err = -ENOMEM;
goto exitcode;
}
if (amfs_getxattr(old_dentry, AMFS_XATTR_NAME, value, 5) > 0) {
if (!strncmp(value, AMFS_BADFILE, 3)) {
err = -EPERM;
goto freevalue;
}
} else if (amfs_getxattr(old_dentry, AMFS_XATTR_NAME, value, 5)
!= -ENODATA) {
err = amfs_getxattr(old_dentry, AMFS_XATTR_NAME, value, 5);
goto freevalue;
}
/****************************************************************/
amfs_get_lower_path(old_dentry, &lower_old_path);
amfs_get_lower_path(new_dentry, &lower_new_path);
lower_old_dentry = lower_old_path.dentry;
lower_new_dentry = lower_new_path.dentry;
lower_old_dir_dentry = dget_parent(lower_old_dentry);
lower_new_dir_dentry = dget_parent(lower_new_dentry);
trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry);
/* source should not be ancestor of target */
if (trap == lower_old_dentry) {
err = -EINVAL;
goto out;
}
/* target should not be ancestor of source */
if (trap == lower_new_dentry) {
err = -ENOTEMPTY;
goto out;
}
err = vfs_rename(lower_old_dir_dentry->d_inode, lower_old_dentry,
lower_new_dir_dentry->d_inode, lower_new_dentry,
NULL, 0);
if (err)
goto out;
fsstack_copy_attr_all(new_dir, lower_new_dir_dentry->d_inode);
fsstack_copy_inode_size(new_dir, lower_new_dir_dentry->d_inode);
if (new_dir != old_dir) {
fsstack_copy_attr_all(old_dir,
lower_old_dir_dentry->d_inode);
fsstack_copy_inode_size(old_dir,
lower_old_dir_dentry->d_inode);
}
out:
unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry);
dput(lower_old_dir_dentry);
dput(lower_new_dir_dentry);
amfs_put_lower_path(old_dentry, &lower_old_path);
amfs_put_lower_path(new_dentry, &lower_new_path);
freevalue:
kfree(value);
exitcode:
return err;
}
