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-rw-r--r--fs/sysfs/inode.c238
1 files changed, 0 insertions, 238 deletions
diff --git a/fs/sysfs/inode.c b/fs/sysfs/inode.c
deleted file mode 100644
index d9262f74f94..00000000000
--- a/fs/sysfs/inode.c
+++ /dev/null
@@ -1,238 +0,0 @@
-/*
- * fs/sysfs/inode.c - basic sysfs inode and dentry operations
- *
- * Copyright (c) 2001-3 Patrick Mochel
- * Copyright (c) 2007 SUSE Linux Products GmbH
- * Copyright (c) 2007 Tejun Heo <teheo@suse.de>
- *
- * This file is released under the GPLv2.
- *
- * 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 <linux/errno.h>
-#include <linux/sched.h>
-#include "sysfs.h"
-
-extern struct super_block * sysfs_sb;
-
-static const struct address_space_operations sysfs_aops = {
- .readpage = simple_readpage,
- .write_begin = simple_write_begin,
- .write_end = simple_write_end,
-};
-
-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 const struct inode_operations sysfs_inode_operations ={
- .setattr = sysfs_setattr,
-};
-
-int __init sysfs_inode_init(void)
-{
- return bdi_init(&sysfs_backing_dev_info);
-}
-
-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;
-}
-
-
-/*
- * sysfs has a different i_mutex lock order behavior for i_mutex than other
- * filesystems; sysfs i_mutex is called in many places with subsystem locks
- * held. At the same time, many of the VFS locking rules do not apply to
- * sysfs at all (cross directory rename for example). To untangle this mess
- * (which gives false positives in lockdep), we're giving sysfs inodes their
- * own class for i_mutex.
- */
-static struct lock_class_key sysfs_inode_imutex_key;
-
-static int sysfs_count_nlink(struct sysfs_dirent *sd)
-{
- struct sysfs_dirent *child;
- int nr = 0;
-
- for (child = sd->s_dir.children; child; child = child->s_sibling)
- if (sysfs_type(child) == SYSFS_DIR)
- nr++;
-
- return nr + 2;
-}
-
-static void sysfs_init_inode(struct sysfs_dirent *sd, struct inode *inode)
-{
- struct bin_attribute *bin_attr;
-
- 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;
- inode->i_ino = sd->s_ino;
- lockdep_set_class(&inode->i_mutex, &sysfs_inode_imutex_key);
-
- 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, sd->s_mode);
-
-
- /* initialize inode according to type */
- switch (sysfs_type(sd)) {
- case SYSFS_DIR:
- inode->i_op = &sysfs_dir_inode_operations;
- inode->i_fop = &sysfs_dir_operations;
- inode->i_nlink = sysfs_count_nlink(sd);
- break;
- case SYSFS_KOBJ_ATTR:
- inode->i_size = PAGE_SIZE;
- inode->i_fop = &sysfs_file_operations;
- break;
- case SYSFS_KOBJ_BIN_ATTR:
- bin_attr = sd->s_bin_attr.bin_attr;
- inode->i_size = bin_attr->size;
- inode->i_fop = &bin_fops;
- break;
- case SYSFS_KOBJ_LINK:
- inode->i_op = &sysfs_symlink_inode_operations;
- break;
- default:
- BUG();
- }
-
- unlock_new_inode(inode);
-}
-
-/**
- * sysfs_get_inode - get inode for sysfs_dirent
- * @sd: sysfs_dirent to allocate inode for
- *
- * Get inode for @sd. If such inode doesn't exist, a new inode
- * is allocated and basics are initialized. New inode is
- * returned locked.
- *
- * LOCKING:
- * Kernel thread context (may sleep).
- *
- * RETURNS:
- * Pointer to allocated inode on success, NULL on failure.
- */
-struct inode * sysfs_get_inode(struct sysfs_dirent *sd)
-{
- struct inode *inode;
-
- inode = iget_locked(sysfs_sb, sd->s_ino);
- if (inode && (inode->i_state & I_NEW))
- sysfs_init_inode(sd, inode);
-
- return inode;
-}
-
-int sysfs_hash_and_remove(struct sysfs_dirent *dir_sd, const char *name)
-{
- struct sysfs_addrm_cxt acxt;
- struct sysfs_dirent *sd;
-
- if (!dir_sd)
- return -ENOENT;
-
- sysfs_addrm_start(&acxt, dir_sd);
-
- sd = sysfs_find_dirent(dir_sd, name);
- if (sd)
- sysfs_remove_one(&acxt, sd);
-
- sysfs_addrm_finish(&acxt);
-
- if (sd)
- return 0;
- else
- return -ENOENT;
-}
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