2005-04-17 06:20:36 +08:00
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/*
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2007-09-20 16:31:38 +08:00
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* fs/sysfs/inode.c - basic sysfs inode and dentry operations
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2005-04-17 06:20:36 +08:00
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*
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2007-09-20 16:31:38 +08:00
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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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2005-04-17 06:20:36 +08:00
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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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2006-01-12 04:17:46 +08:00
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#include <linux/capability.h>
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2006-07-11 14:05:25 +08:00
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#include <linux/errno.h>
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Detach sched.h from mm.h
First thing mm.h does is including sched.h solely for can_do_mlock() inline
function which has "current" dereference inside. By dealing with can_do_mlock()
mm.h can be detached from sched.h which is good. See below, why.
This patch
a) removes unconditional inclusion of sched.h from mm.h
b) makes can_do_mlock() normal function in mm/mlock.c
c) exports can_do_mlock() to not break compilation
d) adds sched.h inclusions back to files that were getting it indirectly.
e) adds less bloated headers to some files (asm/signal.h, jiffies.h) that were
getting them indirectly
Net result is:
a) mm.h users would get less code to open, read, preprocess, parse, ... if
they don't need sched.h
b) sched.h stops being dependency for significant number of files:
on x86_64 allmodconfig touching sched.h results in recompile of 4083 files,
after patch it's only 3744 (-8.3%).
Cross-compile tested on
all arm defconfigs, all mips defconfigs, all powerpc defconfigs,
alpha alpha-up
arm
i386 i386-up i386-defconfig i386-allnoconfig
ia64 ia64-up
m68k
mips
parisc parisc-up
powerpc powerpc-up
s390 s390-up
sparc sparc-up
sparc64 sparc64-up
um-x86_64
x86_64 x86_64-up x86_64-defconfig x86_64-allnoconfig
as well as my two usual configs.
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-05-21 05:22:52 +08:00
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#include <linux/sched.h>
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2005-04-17 06:20:36 +08:00
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#include "sysfs.h"
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extern struct super_block * sysfs_sb;
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2006-06-28 19:26:44 +08:00
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static const struct address_space_operations sysfs_aops = {
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2005-04-17 06:20:36 +08:00
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.readpage = simple_readpage,
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2007-10-16 16:25:03 +08:00
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.write_begin = simple_write_begin,
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.write_end = simple_write_end,
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2005-04-17 06:20:36 +08:00
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};
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static struct backing_dev_info sysfs_backing_dev_info = {
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.ra_pages = 0, /* No readahead */
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2008-04-30 15:54:37 +08:00
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.capabilities = BDI_CAP_NO_ACCT_AND_WRITEBACK,
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2005-04-17 06:20:36 +08:00
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};
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2007-02-12 16:55:40 +08:00
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static const struct inode_operations sysfs_inode_operations ={
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2005-05-31 13:09:14 +08:00
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.setattr = sysfs_setattr,
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};
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2007-10-17 14:25:46 +08:00
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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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2005-05-31 13:09:14 +08:00
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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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struct iattr * sd_iattr;
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unsigned int ia_valid = iattr->ia_valid;
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int error;
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if (!sd)
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return -EINVAL;
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sd_iattr = sd->s_iattr;
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error = inode_change_ok(inode, iattr);
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if (error)
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return error;
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error = inode_setattr(inode, iattr);
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if (error)
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return error;
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if (!sd_iattr) {
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/* setting attributes for the first time, allocate now */
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2006-02-22 18:18:15 +08:00
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sd_iattr = kzalloc(sizeof(struct iattr), GFP_KERNEL);
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2005-05-31 13:09:14 +08:00
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if (!sd_iattr)
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return -ENOMEM;
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/* assign default attributes */
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sd_iattr->ia_mode = sd->s_mode;
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sd_iattr->ia_uid = 0;
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sd_iattr->ia_gid = 0;
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sd_iattr->ia_atime = sd_iattr->ia_mtime = sd_iattr->ia_ctime = CURRENT_TIME;
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sd->s_iattr = sd_iattr;
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}
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/* attributes were changed atleast once in past */
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if (ia_valid & ATTR_UID)
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sd_iattr->ia_uid = iattr->ia_uid;
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if (ia_valid & ATTR_GID)
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sd_iattr->ia_gid = iattr->ia_gid;
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if (ia_valid & ATTR_ATIME)
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sd_iattr->ia_atime = timespec_trunc(iattr->ia_atime,
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inode->i_sb->s_time_gran);
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if (ia_valid & ATTR_MTIME)
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sd_iattr->ia_mtime = timespec_trunc(iattr->ia_mtime,
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inode->i_sb->s_time_gran);
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if (ia_valid & ATTR_CTIME)
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sd_iattr->ia_ctime = timespec_trunc(iattr->ia_ctime,
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inode->i_sb->s_time_gran);
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if (ia_valid & ATTR_MODE) {
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umode_t mode = iattr->ia_mode;
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if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID))
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mode &= ~S_ISGID;
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2005-07-30 03:14:19 +08:00
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sd_iattr->ia_mode = sd->s_mode = mode;
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2005-05-31 13:09:14 +08:00
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}
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return error;
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}
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2005-05-31 13:09:52 +08:00
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static inline void set_default_inode_attr(struct inode * inode, mode_t mode)
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{
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inode->i_mode = mode;
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inode->i_uid = 0;
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inode->i_gid = 0;
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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_mode = iattr->ia_mode;
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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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2006-07-13 00:03:06 +08:00
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/*
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* sysfs has a different i_mutex lock order behavior for i_mutex than other
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* filesystems; sysfs i_mutex is called in many places with subsystem locks
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* held. At the same time, many of the VFS locking rules do not apply to
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* sysfs at all (cross directory rename for example). To untangle this mess
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* (which gives false positives in lockdep), we're giving sysfs inodes their
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* own class for i_mutex.
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*/
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static struct lock_class_key sysfs_inode_imutex_key;
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2007-08-20 20:36:29 +08:00
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static int sysfs_count_nlink(struct sysfs_dirent *sd)
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{
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struct sysfs_dirent *child;
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int nr = 0;
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2007-09-20 15:05:12 +08:00
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for (child = sd->s_dir.children; child; child = child->s_sibling)
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2007-08-20 20:36:29 +08:00
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if (sysfs_type(child) == SYSFS_DIR)
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nr++;
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return nr + 2;
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}
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2007-07-18 13:30:28 +08:00
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static void sysfs_init_inode(struct sysfs_dirent *sd, struct inode *inode)
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2005-04-17 06:20:36 +08:00
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{
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2007-08-20 20:36:29 +08:00
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struct bin_attribute *bin_attr;
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2007-06-14 02:45:17 +08:00
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inode->i_blocks = 0;
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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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inode->i_ino = sd->s_ino;
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lockdep_set_class(&inode->i_mutex, &sysfs_inode_imutex_key);
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if (sd->s_iattr) {
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/* sysfs_dirent has non-default attributes
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* get them for the new inode from persistent copy
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* in sysfs_dirent
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*/
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set_inode_attr(inode, sd->s_iattr);
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} else
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set_default_inode_attr(inode, sd->s_mode);
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2007-08-20 20:36:29 +08:00
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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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inode->i_nlink = sysfs_count_nlink(sd);
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break;
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case SYSFS_KOBJ_ATTR:
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inode->i_size = PAGE_SIZE;
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inode->i_fop = &sysfs_file_operations;
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break;
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case SYSFS_KOBJ_BIN_ATTR:
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2007-09-20 15:05:11 +08:00
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bin_attr = sd->s_bin_attr.bin_attr;
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2007-08-20 20:36:29 +08:00
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inode->i_size = bin_attr->size;
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inode->i_fop = &bin_fops;
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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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2007-06-14 02:45:17 +08:00
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}
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/**
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2007-06-14 02:45:17 +08:00
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* sysfs_get_inode - get inode for sysfs_dirent
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2007-06-14 02:45:17 +08:00
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* @sd: sysfs_dirent to allocate inode for
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*
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2007-06-14 02:45:17 +08:00
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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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2007-06-14 02:45:17 +08:00
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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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2007-06-14 02:45:17 +08:00
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struct inode * sysfs_get_inode(struct sysfs_dirent *sd)
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2007-06-14 02:45:17 +08:00
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{
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struct inode *inode;
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2007-06-14 02:45:17 +08:00
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inode = iget_locked(sysfs_sb, sd->s_ino);
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if (inode && (inode->i_state & I_NEW))
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2007-06-14 02:45:17 +08:00
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sysfs_init_inode(sd, inode);
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2005-04-17 06:20:36 +08:00
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return inode;
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}
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2007-06-14 03:27:22 +08:00
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int sysfs_hash_and_remove(struct sysfs_dirent *dir_sd, const char *name)
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2005-04-17 06:20:36 +08:00
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{
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2007-06-14 03:27:24 +08:00
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struct sysfs_addrm_cxt acxt;
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2007-08-02 20:38:03 +08:00
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struct sysfs_dirent *sd;
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2006-03-17 07:44:26 +08:00
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2007-06-14 03:27:22 +08:00
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if (!dir_sd)
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2006-07-11 14:05:25 +08:00
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return -ENOENT;
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2005-04-17 06:20:36 +08:00
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2007-06-14 03:27:24 +08:00
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sysfs_addrm_start(&acxt, dir_sd);
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2007-06-14 03:27:22 +08:00
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2007-08-02 20:38:03 +08:00
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sd = sysfs_find_dirent(dir_sd, name);
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if (sd)
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sysfs_remove_one(&acxt, sd);
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2007-06-14 03:27:23 +08:00
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2007-08-02 20:38:03 +08:00
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sysfs_addrm_finish(&acxt);
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if (sd)
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2007-06-14 03:27:24 +08:00
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return 0;
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2007-08-02 20:38:03 +08:00
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else
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return -ENOENT;
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2005-04-17 06:20:36 +08:00
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}
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