diff options
Diffstat (limited to 'fs/proc/root.c')
| -rw-r--r-- | fs/proc/root.c | 184 |
1 files changed, 184 insertions, 0 deletions
diff --git a/fs/proc/root.c b/fs/proc/root.c new file mode 100644 index 000000000..97cf2ff25 --- /dev/null +++ b/fs/proc/root.c @@ -0,0 +1,184 @@ +/* + * linux/fs/proc/root.c + * + * Copyright (C) 1991, 1992 Linus Torvalds + * + * proc root directory handling functions + */ + +#include <asm/segment.h> + +#include <linux/errno.h> +#include <linux/sched.h> +#include <linux/proc_fs.h> +#include <linux/stat.h> +#include <linux/config.h> + +static int proc_readroot(struct inode *, struct file *, struct dirent *, int); +static int proc_lookuproot(struct inode *,const char *,int,struct inode **); + +static struct file_operations proc_root_operations = { + NULL, /* lseek - default */ + NULL, /* read - bad */ + NULL, /* write - bad */ + proc_readroot, /* readdir */ + NULL, /* select - default */ + NULL, /* ioctl - default */ + NULL, /* mmap */ + NULL, /* no special open code */ + NULL, /* no special release code */ + NULL /* no fsync */ +}; + +/* + * proc directories can do almost nothing.. + */ +struct inode_operations proc_root_inode_operations = { + &proc_root_operations, /* default base directory file-ops */ + NULL, /* create */ + proc_lookuproot, /* lookup */ + NULL, /* link */ + NULL, /* unlink */ + NULL, /* symlink */ + NULL, /* mkdir */ + NULL, /* rmdir */ + NULL, /* mknod */ + NULL, /* rename */ + NULL, /* readlink */ + NULL, /* follow_link */ + NULL, /* bmap */ + NULL, /* truncate */ + NULL /* permission */ +}; + +static struct proc_dir_entry root_dir[] = { + { PROC_ROOT_INO, 1, "." }, + { PROC_ROOT_INO, 2, ".." }, + { PROC_LOADAVG, 7, "loadavg" }, + { PROC_UPTIME, 6, "uptime" }, + { PROC_MEMINFO, 7, "meminfo" }, + { PROC_KMSG, 4, "kmsg" }, + { PROC_VERSION, 7, "version" }, + { PROC_SELF, 4, "self" }, /* will change inode # */ + { PROC_NET, 3, "net" }, +#ifdef CONFIG_DEBUG_MALLOC + { PROC_MALLOC, 6, "malloc" }, +#endif + { PROC_KCORE, 5, "kcore" }, + { PROC_MODULES, 7, "modules" }, + { PROC_STAT, 4, "stat" }, + { PROC_DEVICES, 7, "devices" }, + { PROC_INTERRUPTS, 10,"interrupts" }, + { PROC_FILESYSTEMS, 11,"filesystems" }, + { PROC_KSYMS, 5, "ksyms" }, + { PROC_DMA, 3, "dma" }, +}; + +#define NR_ROOT_DIRENTRY ((sizeof (root_dir))/(sizeof (root_dir[0]))) + +static int proc_lookuproot(struct inode * dir,const char * name, int len, + struct inode ** result) +{ + unsigned int pid, c; + int i, ino; + + *result = NULL; + if (!dir) + return -ENOENT; + if (!S_ISDIR(dir->i_mode)) { + iput(dir); + return -ENOENT; + } + i = NR_ROOT_DIRENTRY; + while (i-- > 0 && !proc_match(len,name,root_dir+i)) + /* nothing */; + if (i >= 0) { + ino = root_dir[i].low_ino; + if (ino == PROC_ROOT_INO) { + *result = dir; + return 0; + } + if (ino == PROC_SELF) /* self modifying inode ... */ + ino = (current->pid << 16) + 2; + } else { + pid = 0; + while (len-- > 0) { + c = *name - '0'; + name++; + if (c > 9) { + pid = 0; + break; + } + pid *= 10; + pid += c; + if (pid & 0xffff0000) { + pid = 0; + break; + } + } + for (i = 0 ; i < NR_TASKS ; i++) + if (task[i] && task[i]->pid == pid) + break; + if (!pid || i >= NR_TASKS) { + iput(dir); + return -ENOENT; + } + ino = (pid << 16) + 2; + } + if (!(*result = iget(dir->i_sb,ino))) { + iput(dir); + return -ENOENT; + } + iput(dir); + return 0; +} + +static int proc_readroot(struct inode * inode, struct file * filp, + struct dirent * dirent, int count) +{ + struct task_struct * p; + unsigned int nr,pid; + int i,j; + + if (!inode || !S_ISDIR(inode->i_mode)) + return -EBADF; +repeat: + nr = filp->f_pos; + if (nr < NR_ROOT_DIRENTRY) { + struct proc_dir_entry * de = root_dir + nr; + + filp->f_pos++; + i = de->namelen; + put_fs_long(de->low_ino, &dirent->d_ino); + put_fs_word(i,&dirent->d_reclen); + put_fs_byte(0,i+dirent->d_name); + j = i; + while (i--) + put_fs_byte(de->name[i], i+dirent->d_name); + return j; + } + nr -= NR_ROOT_DIRENTRY; + if (nr >= NR_TASKS) + return 0; + filp->f_pos++; + p = task[nr]; + if (!p || !(pid = p->pid)) + goto repeat; + if (pid & 0xffff0000) + goto repeat; + j = 10; + i = 1; + while (pid >= j) { + j *= 10; + i++; + } + j = i; + put_fs_long((pid << 16)+2, &dirent->d_ino); + put_fs_word(i, &dirent->d_reclen); + put_fs_byte(0, i+dirent->d_name); + while (i--) { + put_fs_byte('0'+(pid % 10), i+dirent->d_name); + pid /= 10; + } + return j; +} |