There's nothing sysfs-specific in fs/sysfs/inode.c. Move everything in it to fs/kernfs/inode.c. The respective declarations in fs/sysfs/sysfs.h are moved to fs/kernfs/kernfs-internal.h. This is pure relocation. Signed-off-by: Tejun Heo <tj@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>tirimbino
Tejun Heo
11 years ago
committed by
Greg Kroah-Hartman
parent
ae6621b071
commit
ffed24e228
@ -1,342 +0,0 @@ |
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/*
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* fs/sysfs/inode.c - basic sysfs inode and dentry operations |
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* |
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* Copyright (c) 2001-3 Patrick Mochel |
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* Copyright (c) 2007 SUSE Linux Products GmbH |
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* Copyright (c) 2007 Tejun Heo <teheo@suse.de> |
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* |
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* This file is released under the GPLv2. |
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* |
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* Please see Documentation/filesystems/sysfs.txt for more information. |
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*/ |
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#undef DEBUG |
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#include <linux/pagemap.h> |
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#include <linux/namei.h> |
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#include <linux/backing-dev.h> |
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#include <linux/capability.h> |
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#include <linux/errno.h> |
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#include <linux/sched.h> |
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#include <linux/slab.h> |
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#include <linux/sysfs.h> |
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#include <linux/xattr.h> |
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#include <linux/security.h> |
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#include "sysfs.h" |
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static const struct address_space_operations sysfs_aops = { |
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.readpage = simple_readpage, |
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.write_begin = simple_write_begin, |
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.write_end = simple_write_end, |
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}; |
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static struct backing_dev_info sysfs_backing_dev_info = { |
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.name = "sysfs", |
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.ra_pages = 0, /* No readahead */ |
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.capabilities = BDI_CAP_NO_ACCT_AND_WRITEBACK, |
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}; |
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static const struct inode_operations sysfs_inode_operations = { |
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.permission = sysfs_permission, |
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.setattr = sysfs_setattr, |
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.getattr = sysfs_getattr, |
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.setxattr = sysfs_setxattr, |
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}; |
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int __init sysfs_inode_init(void) |
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{ |
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return bdi_init(&sysfs_backing_dev_info); |
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} |
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static struct sysfs_inode_attrs *sysfs_init_inode_attrs(struct sysfs_dirent *sd) |
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{ |
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struct sysfs_inode_attrs *attrs; |
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struct iattr *iattrs; |
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attrs = kzalloc(sizeof(struct sysfs_inode_attrs), GFP_KERNEL); |
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if (!attrs) |
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return NULL; |
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iattrs = &attrs->ia_iattr; |
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/* assign default attributes */ |
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iattrs->ia_mode = sd->s_mode; |
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iattrs->ia_uid = GLOBAL_ROOT_UID; |
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iattrs->ia_gid = GLOBAL_ROOT_GID; |
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iattrs->ia_atime = iattrs->ia_mtime = iattrs->ia_ctime = CURRENT_TIME; |
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return attrs; |
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} |
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static int __kernfs_setattr(struct sysfs_dirent *sd, const struct iattr *iattr) |
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{ |
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struct sysfs_inode_attrs *sd_attrs; |
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struct iattr *iattrs; |
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unsigned int ia_valid = iattr->ia_valid; |
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sd_attrs = sd->s_iattr; |
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if (!sd_attrs) { |
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/* setting attributes for the first time, allocate now */ |
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sd_attrs = sysfs_init_inode_attrs(sd); |
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if (!sd_attrs) |
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return -ENOMEM; |
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sd->s_iattr = sd_attrs; |
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} |
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/* attributes were changed at least once in past */ |
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iattrs = &sd_attrs->ia_iattr; |
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if (ia_valid & ATTR_UID) |
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iattrs->ia_uid = iattr->ia_uid; |
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if (ia_valid & ATTR_GID) |
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iattrs->ia_gid = iattr->ia_gid; |
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if (ia_valid & ATTR_ATIME) |
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iattrs->ia_atime = iattr->ia_atime; |
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if (ia_valid & ATTR_MTIME) |
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iattrs->ia_mtime = iattr->ia_mtime; |
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if (ia_valid & ATTR_CTIME) |
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iattrs->ia_ctime = iattr->ia_ctime; |
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if (ia_valid & ATTR_MODE) { |
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umode_t mode = iattr->ia_mode; |
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iattrs->ia_mode = sd->s_mode = mode; |
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} |
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return 0; |
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} |
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/**
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* kernfs_setattr - set iattr on a node |
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* @sd: target node |
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* @iattr: iattr to set |
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* |
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* Returns 0 on success, -errno on failure. |
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*/ |
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int kernfs_setattr(struct sysfs_dirent *sd, const struct iattr *iattr) |
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{ |
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int ret; |
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mutex_lock(&sysfs_mutex); |
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ret = __kernfs_setattr(sd, iattr); |
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mutex_unlock(&sysfs_mutex); |
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return ret; |
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} |
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int sysfs_setattr(struct dentry *dentry, struct iattr *iattr) |
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{ |
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struct inode *inode = dentry->d_inode; |
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struct sysfs_dirent *sd = dentry->d_fsdata; |
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int error; |
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if (!sd) |
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return -EINVAL; |
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mutex_lock(&sysfs_mutex); |
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error = inode_change_ok(inode, iattr); |
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if (error) |
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goto out; |
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error = __kernfs_setattr(sd, iattr); |
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if (error) |
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goto out; |
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/* this ignores size changes */ |
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setattr_copy(inode, iattr); |
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out: |
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mutex_unlock(&sysfs_mutex); |
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return error; |
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} |
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static int sysfs_sd_setsecdata(struct sysfs_dirent *sd, void **secdata, |
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u32 *secdata_len) |
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{ |
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struct sysfs_inode_attrs *iattrs; |
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void *old_secdata; |
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size_t old_secdata_len; |
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if (!sd->s_iattr) { |
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sd->s_iattr = sysfs_init_inode_attrs(sd); |
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if (!sd->s_iattr) |
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return -ENOMEM; |
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} |
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iattrs = sd->s_iattr; |
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old_secdata = iattrs->ia_secdata; |
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old_secdata_len = iattrs->ia_secdata_len; |
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iattrs->ia_secdata = *secdata; |
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iattrs->ia_secdata_len = *secdata_len; |
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*secdata = old_secdata; |
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*secdata_len = old_secdata_len; |
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return 0; |
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} |
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int sysfs_setxattr(struct dentry *dentry, const char *name, const void *value, |
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size_t size, int flags) |
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{ |
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struct sysfs_dirent *sd = dentry->d_fsdata; |
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void *secdata; |
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int error; |
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u32 secdata_len = 0; |
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if (!sd) |
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return -EINVAL; |
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if (!strncmp(name, XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN)) { |
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const char *suffix = name + XATTR_SECURITY_PREFIX_LEN; |
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error = security_inode_setsecurity(dentry->d_inode, suffix, |
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value, size, flags); |
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if (error) |
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goto out; |
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error = security_inode_getsecctx(dentry->d_inode, |
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&secdata, &secdata_len); |
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if (error) |
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goto out; |
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mutex_lock(&sysfs_mutex); |
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error = sysfs_sd_setsecdata(sd, &secdata, &secdata_len); |
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mutex_unlock(&sysfs_mutex); |
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if (secdata) |
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security_release_secctx(secdata, secdata_len); |
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} else |
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return -EINVAL; |
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out: |
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return error; |
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} |
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static inline void set_default_inode_attr(struct inode *inode, umode_t mode) |
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{ |
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inode->i_mode = mode; |
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inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; |
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} |
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static inline void set_inode_attr(struct inode *inode, struct iattr *iattr) |
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{ |
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inode->i_uid = iattr->ia_uid; |
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inode->i_gid = iattr->ia_gid; |
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inode->i_atime = iattr->ia_atime; |
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inode->i_mtime = iattr->ia_mtime; |
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inode->i_ctime = iattr->ia_ctime; |
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} |
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static void sysfs_refresh_inode(struct sysfs_dirent *sd, struct inode *inode) |
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{ |
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struct sysfs_inode_attrs *iattrs = sd->s_iattr; |
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inode->i_mode = sd->s_mode; |
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if (iattrs) { |
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/* sysfs_dirent has non-default attributes
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* get them from persistent copy in sysfs_dirent |
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*/ |
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set_inode_attr(inode, &iattrs->ia_iattr); |
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security_inode_notifysecctx(inode, |
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iattrs->ia_secdata, |
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iattrs->ia_secdata_len); |
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} |
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if (sysfs_type(sd) == SYSFS_DIR) |
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set_nlink(inode, sd->s_dir.subdirs + 2); |
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} |
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int sysfs_getattr(struct vfsmount *mnt, struct dentry *dentry, |
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struct kstat *stat) |
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{ |
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struct sysfs_dirent *sd = dentry->d_fsdata; |
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struct inode *inode = dentry->d_inode; |
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mutex_lock(&sysfs_mutex); |
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sysfs_refresh_inode(sd, inode); |
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mutex_unlock(&sysfs_mutex); |
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generic_fillattr(inode, stat); |
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return 0; |
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} |
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static void sysfs_init_inode(struct sysfs_dirent *sd, struct inode *inode) |
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{ |
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kernfs_get(sd); |
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inode->i_private = sd; |
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inode->i_mapping->a_ops = &sysfs_aops; |
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inode->i_mapping->backing_dev_info = &sysfs_backing_dev_info; |
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inode->i_op = &sysfs_inode_operations; |
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set_default_inode_attr(inode, sd->s_mode); |
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sysfs_refresh_inode(sd, inode); |
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/* initialize inode according to type */ |
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switch (sysfs_type(sd)) { |
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case SYSFS_DIR: |
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inode->i_op = &sysfs_dir_inode_operations; |
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inode->i_fop = &sysfs_dir_operations; |
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break; |
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case SYSFS_KOBJ_ATTR: |
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inode->i_size = sd->s_attr.size; |
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inode->i_fop = &kernfs_file_operations; |
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break; |
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case SYSFS_KOBJ_LINK: |
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inode->i_op = &sysfs_symlink_inode_operations; |
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break; |
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default: |
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BUG(); |
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} |
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unlock_new_inode(inode); |
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} |
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/**
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* sysfs_get_inode - get inode for sysfs_dirent |
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* @sb: super block |
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* @sd: sysfs_dirent to allocate inode for |
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* |
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* Get inode for @sd. If such inode doesn't exist, a new inode |
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* is allocated and basics are initialized. New inode is |
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* returned locked. |
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* |
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* LOCKING: |
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* Kernel thread context (may sleep). |
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* |
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* RETURNS: |
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* Pointer to allocated inode on success, NULL on failure. |
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*/ |
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struct inode *sysfs_get_inode(struct super_block *sb, struct sysfs_dirent *sd) |
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{ |
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struct inode *inode; |
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inode = iget_locked(sb, sd->s_ino); |
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if (inode && (inode->i_state & I_NEW)) |
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sysfs_init_inode(sd, inode); |
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return inode; |
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} |
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/*
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* The sysfs_dirent serves as both an inode and a directory entry for sysfs. |
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* To prevent the sysfs inode numbers from being freed prematurely we take a |
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* reference to sysfs_dirent from the sysfs inode. A |
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* super_operations.evict_inode() implementation is needed to drop that |
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* reference upon inode destruction. |
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*/ |
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void sysfs_evict_inode(struct inode *inode) |
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{ |
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struct sysfs_dirent *sd = inode->i_private; |
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truncate_inode_pages(&inode->i_data, 0); |
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clear_inode(inode); |
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kernfs_put(sd); |
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} |
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int sysfs_permission(struct inode *inode, int mask) |
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{ |
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struct sysfs_dirent *sd; |
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if (mask & MAY_NOT_BLOCK) |
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return -ECHILD; |
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sd = inode->i_private; |
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mutex_lock(&sysfs_mutex); |
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sysfs_refresh_inode(sd, inode); |
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mutex_unlock(&sysfs_mutex); |
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return generic_permission(inode, mask); |
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} |
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