e080e436f6
While making sysfs indoes hashed, sysfs root inode was left out. Now that nlink accounting depends on the inode being on the hash, sysfs root inode nlink isn't adjusted properly. Put sysfs root inode on the inode hash by allocating it using sysfs_get_inode() like other sysfs inodes. While at it, massage comments a bit. Signed-off-by: Tejun Heo <htejun@gmail.com> Acked-by: Jean Delvare <khali@linux-fr.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
112 lines
2.5 KiB
C
112 lines
2.5 KiB
C
/*
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* mount.c - operations for initializing and mounting sysfs.
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*/
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#define DEBUG
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#include <linux/fs.h>
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#include <linux/mount.h>
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#include <linux/pagemap.h>
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#include <linux/init.h>
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#include <asm/semaphore.h>
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#include "sysfs.h"
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/* Random magic number */
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#define SYSFS_MAGIC 0x62656572
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struct vfsmount *sysfs_mount;
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struct super_block * sysfs_sb = NULL;
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struct kmem_cache *sysfs_dir_cachep;
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static const struct super_operations sysfs_ops = {
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.statfs = simple_statfs,
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.drop_inode = sysfs_delete_inode,
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};
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struct sysfs_dirent sysfs_root = {
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.s_count = ATOMIC_INIT(1),
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.s_flags = SYSFS_ROOT,
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.s_mode = S_IFDIR | S_IRWXU | S_IRUGO | S_IXUGO,
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.s_ino = 1,
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};
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static int sysfs_fill_super(struct super_block *sb, void *data, int silent)
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{
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struct inode *inode;
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struct dentry *root;
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sb->s_blocksize = PAGE_CACHE_SIZE;
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sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
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sb->s_magic = SYSFS_MAGIC;
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sb->s_op = &sysfs_ops;
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sb->s_time_gran = 1;
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sysfs_sb = sb;
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/* get root inode, initialize and unlock it */
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inode = sysfs_get_inode(&sysfs_root);
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if (!inode) {
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pr_debug("sysfs: could not get root inode\n");
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return -ENOMEM;
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}
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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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inc_nlink(inode); /* directory, account for "." */
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unlock_new_inode(inode);
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/* instantiate and link root dentry */
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root = d_alloc_root(inode);
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if (!root) {
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pr_debug("%s: could not get root dentry!\n",__FUNCTION__);
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iput(inode);
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return -ENOMEM;
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}
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sysfs_root.s_dentry = root;
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root->d_fsdata = &sysfs_root;
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sb->s_root = root;
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return 0;
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}
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static int sysfs_get_sb(struct file_system_type *fs_type,
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int flags, const char *dev_name, void *data, struct vfsmount *mnt)
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{
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return get_sb_single(fs_type, flags, data, sysfs_fill_super, mnt);
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}
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static struct file_system_type sysfs_fs_type = {
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.name = "sysfs",
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.get_sb = sysfs_get_sb,
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.kill_sb = kill_litter_super,
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};
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int __init sysfs_init(void)
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{
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int err = -ENOMEM;
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sysfs_dir_cachep = kmem_cache_create("sysfs_dir_cache",
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sizeof(struct sysfs_dirent),
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0, 0, NULL, NULL);
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if (!sysfs_dir_cachep)
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goto out;
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err = register_filesystem(&sysfs_fs_type);
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if (!err) {
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sysfs_mount = kern_mount(&sysfs_fs_type);
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if (IS_ERR(sysfs_mount)) {
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printk(KERN_ERR "sysfs: could not mount!\n");
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err = PTR_ERR(sysfs_mount);
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sysfs_mount = NULL;
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unregister_filesystem(&sysfs_fs_type);
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goto out_err;
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}
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} else
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goto out_err;
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out:
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return err;
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out_err:
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kmem_cache_destroy(sysfs_dir_cachep);
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sysfs_dir_cachep = NULL;
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goto out;
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}
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