![Eric Sesterhenn](/assets/img/avatar_default.png)
this converts fs/sysfs to kzalloc() usage. compile tested with make allyesconfig Signed-off-by: Eric Sesterhenn <snakebyte@gmx.de> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
252 lines
5.9 KiB
C
252 lines
5.9 KiB
C
/*
|
|
* inode.c - basic inode and dentry operations.
|
|
*
|
|
* sysfs is Copyright (c) 2001-3 Patrick Mochel
|
|
*
|
|
* Please see Documentation/filesystems/sysfs.txt for more information.
|
|
*/
|
|
|
|
#undef DEBUG
|
|
|
|
#include <linux/pagemap.h>
|
|
#include <linux/namei.h>
|
|
#include <linux/backing-dev.h>
|
|
#include <linux/capability.h>
|
|
#include "sysfs.h"
|
|
|
|
extern struct super_block * sysfs_sb;
|
|
|
|
static struct address_space_operations sysfs_aops = {
|
|
.readpage = simple_readpage,
|
|
.prepare_write = simple_prepare_write,
|
|
.commit_write = simple_commit_write
|
|
};
|
|
|
|
static struct backing_dev_info sysfs_backing_dev_info = {
|
|
.ra_pages = 0, /* No readahead */
|
|
.capabilities = BDI_CAP_NO_ACCT_DIRTY | BDI_CAP_NO_WRITEBACK,
|
|
};
|
|
|
|
static struct inode_operations sysfs_inode_operations ={
|
|
.setattr = sysfs_setattr,
|
|
};
|
|
|
|
int sysfs_setattr(struct dentry * dentry, struct iattr * iattr)
|
|
{
|
|
struct inode * inode = dentry->d_inode;
|
|
struct sysfs_dirent * sd = dentry->d_fsdata;
|
|
struct iattr * sd_iattr;
|
|
unsigned int ia_valid = iattr->ia_valid;
|
|
int error;
|
|
|
|
if (!sd)
|
|
return -EINVAL;
|
|
|
|
sd_iattr = sd->s_iattr;
|
|
|
|
error = inode_change_ok(inode, iattr);
|
|
if (error)
|
|
return error;
|
|
|
|
error = inode_setattr(inode, iattr);
|
|
if (error)
|
|
return error;
|
|
|
|
if (!sd_iattr) {
|
|
/* setting attributes for the first time, allocate now */
|
|
sd_iattr = kzalloc(sizeof(struct iattr), GFP_KERNEL);
|
|
if (!sd_iattr)
|
|
return -ENOMEM;
|
|
/* assign default attributes */
|
|
sd_iattr->ia_mode = sd->s_mode;
|
|
sd_iattr->ia_uid = 0;
|
|
sd_iattr->ia_gid = 0;
|
|
sd_iattr->ia_atime = sd_iattr->ia_mtime = sd_iattr->ia_ctime = CURRENT_TIME;
|
|
sd->s_iattr = sd_iattr;
|
|
}
|
|
|
|
/* attributes were changed atleast once in past */
|
|
|
|
if (ia_valid & ATTR_UID)
|
|
sd_iattr->ia_uid = iattr->ia_uid;
|
|
if (ia_valid & ATTR_GID)
|
|
sd_iattr->ia_gid = iattr->ia_gid;
|
|
if (ia_valid & ATTR_ATIME)
|
|
sd_iattr->ia_atime = timespec_trunc(iattr->ia_atime,
|
|
inode->i_sb->s_time_gran);
|
|
if (ia_valid & ATTR_MTIME)
|
|
sd_iattr->ia_mtime = timespec_trunc(iattr->ia_mtime,
|
|
inode->i_sb->s_time_gran);
|
|
if (ia_valid & ATTR_CTIME)
|
|
sd_iattr->ia_ctime = timespec_trunc(iattr->ia_ctime,
|
|
inode->i_sb->s_time_gran);
|
|
if (ia_valid & ATTR_MODE) {
|
|
umode_t mode = iattr->ia_mode;
|
|
|
|
if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID))
|
|
mode &= ~S_ISGID;
|
|
sd_iattr->ia_mode = sd->s_mode = mode;
|
|
}
|
|
|
|
return error;
|
|
}
|
|
|
|
static inline void set_default_inode_attr(struct inode * inode, mode_t mode)
|
|
{
|
|
inode->i_mode = mode;
|
|
inode->i_uid = 0;
|
|
inode->i_gid = 0;
|
|
inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
|
|
}
|
|
|
|
static inline void set_inode_attr(struct inode * inode, struct iattr * iattr)
|
|
{
|
|
inode->i_mode = iattr->ia_mode;
|
|
inode->i_uid = iattr->ia_uid;
|
|
inode->i_gid = iattr->ia_gid;
|
|
inode->i_atime = iattr->ia_atime;
|
|
inode->i_mtime = iattr->ia_mtime;
|
|
inode->i_ctime = iattr->ia_ctime;
|
|
}
|
|
|
|
struct inode * sysfs_new_inode(mode_t mode, struct sysfs_dirent * sd)
|
|
{
|
|
struct inode * inode = new_inode(sysfs_sb);
|
|
if (inode) {
|
|
inode->i_blksize = PAGE_CACHE_SIZE;
|
|
inode->i_blocks = 0;
|
|
inode->i_mapping->a_ops = &sysfs_aops;
|
|
inode->i_mapping->backing_dev_info = &sysfs_backing_dev_info;
|
|
inode->i_op = &sysfs_inode_operations;
|
|
|
|
if (sd->s_iattr) {
|
|
/* sysfs_dirent has non-default attributes
|
|
* get them for the new inode from persistent copy
|
|
* in sysfs_dirent
|
|
*/
|
|
set_inode_attr(inode, sd->s_iattr);
|
|
} else
|
|
set_default_inode_attr(inode, mode);
|
|
}
|
|
return inode;
|
|
}
|
|
|
|
int sysfs_create(struct dentry * dentry, int mode, int (*init)(struct inode *))
|
|
{
|
|
int error = 0;
|
|
struct inode * inode = NULL;
|
|
if (dentry) {
|
|
if (!dentry->d_inode) {
|
|
struct sysfs_dirent * sd = dentry->d_fsdata;
|
|
if ((inode = sysfs_new_inode(mode, sd))) {
|
|
if (dentry->d_parent && dentry->d_parent->d_inode) {
|
|
struct inode *p_inode = dentry->d_parent->d_inode;
|
|
p_inode->i_mtime = p_inode->i_ctime = CURRENT_TIME;
|
|
}
|
|
goto Proceed;
|
|
}
|
|
else
|
|
error = -ENOMEM;
|
|
} else
|
|
error = -EEXIST;
|
|
} else
|
|
error = -ENOENT;
|
|
goto Done;
|
|
|
|
Proceed:
|
|
if (init)
|
|
error = init(inode);
|
|
if (!error) {
|
|
d_instantiate(dentry, inode);
|
|
if (S_ISDIR(mode))
|
|
dget(dentry); /* pin only directory dentry in core */
|
|
} else
|
|
iput(inode);
|
|
Done:
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Get the name for corresponding element represented by the given sysfs_dirent
|
|
*/
|
|
const unsigned char * sysfs_get_name(struct sysfs_dirent *sd)
|
|
{
|
|
struct attribute * attr;
|
|
struct bin_attribute * bin_attr;
|
|
struct sysfs_symlink * sl;
|
|
|
|
if (!sd || !sd->s_element)
|
|
BUG();
|
|
|
|
switch (sd->s_type) {
|
|
case SYSFS_DIR:
|
|
/* Always have a dentry so use that */
|
|
return sd->s_dentry->d_name.name;
|
|
|
|
case SYSFS_KOBJ_ATTR:
|
|
attr = sd->s_element;
|
|
return attr->name;
|
|
|
|
case SYSFS_KOBJ_BIN_ATTR:
|
|
bin_attr = sd->s_element;
|
|
return bin_attr->attr.name;
|
|
|
|
case SYSFS_KOBJ_LINK:
|
|
sl = sd->s_element;
|
|
return sl->link_name;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
|
|
/*
|
|
* Unhashes the dentry corresponding to given sysfs_dirent
|
|
* Called with parent inode's i_mutex held.
|
|
*/
|
|
void sysfs_drop_dentry(struct sysfs_dirent * sd, struct dentry * parent)
|
|
{
|
|
struct dentry * dentry = sd->s_dentry;
|
|
|
|
if (dentry) {
|
|
spin_lock(&dcache_lock);
|
|
spin_lock(&dentry->d_lock);
|
|
if (!(d_unhashed(dentry) && dentry->d_inode)) {
|
|
dget_locked(dentry);
|
|
__d_drop(dentry);
|
|
spin_unlock(&dentry->d_lock);
|
|
spin_unlock(&dcache_lock);
|
|
simple_unlink(parent->d_inode, dentry);
|
|
} else {
|
|
spin_unlock(&dentry->d_lock);
|
|
spin_unlock(&dcache_lock);
|
|
}
|
|
}
|
|
}
|
|
|
|
void sysfs_hash_and_remove(struct dentry * dir, const char * name)
|
|
{
|
|
struct sysfs_dirent * sd;
|
|
struct sysfs_dirent * parent_sd;
|
|
|
|
if (!dir)
|
|
return;
|
|
|
|
if (dir->d_inode == NULL)
|
|
/* no inode means this hasn't been made visible yet */
|
|
return;
|
|
|
|
parent_sd = dir->d_fsdata;
|
|
mutex_lock(&dir->d_inode->i_mutex);
|
|
list_for_each_entry(sd, &parent_sd->s_children, s_sibling) {
|
|
if (!sd->s_element)
|
|
continue;
|
|
if (!strcmp(sysfs_get_name(sd), name)) {
|
|
list_del_init(&sd->s_sibling);
|
|
sysfs_drop_dentry(sd, dir);
|
|
sysfs_put(sd);
|
|
break;
|
|
}
|
|
}
|
|
mutex_unlock(&dir->d_inode->i_mutex);
|
|
}
|