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They * use the in-memory "struct proc_dir_entry" tree to parse * the /proc directory. * * NOTE! The /proc/scsi directory currently does not correctly * build up the proc_dir_entry tree, and will show up empty. */ static struct file_operations proc_dir_operations = { NULL, /* lseek - default */ NULL, /* read - bad */ NULL, /* write - bad */ proc_readdir, /* readdir */ NULL, /* poll - default */ NULL, /* ioctl - default */ NULL, /* mmap */ NULL, /* no special open code */ NULL, /* flush */ NULL, /* no special release code */ NULL /* can't fsync */ }; /* * proc directories can do almost nothing.. */ struct inode_operations proc_dir_inode_operations = { &proc_dir_operations, /* default net directory file-ops */ NULL, /* create */ proc_lookup, /* lookup */ NULL, /* link */ NULL, /* unlink */ NULL, /* symlink */ NULL, /* mkdir */ NULL, /* rmdir */ NULL, /* mknod */ NULL, /* rename */ NULL, /* readlink */ NULL, /* follow_link */ NULL, /* readpage */ NULL, /* writepage */ NULL, /* bmap */ NULL, /* truncate */ NULL /* permission */ }; /* * /proc dynamic directories now support unlinking */ struct inode_operations proc_dyna_dir_inode_operations = { &proc_dir_operations, /* default proc dir ops */ NULL, /* create */ proc_lookup, /* lookup */ NULL, /* link */ proc_unlink, /* unlink(struct inode *, struct dentry *) */ NULL, /* symlink */ NULL, /* mkdir */ NULL, /* rmdir */ NULL, /* mknod */ NULL, /* rename */ NULL, /* readlink */ NULL, /* follow_link */ NULL, /* readpage */ NULL, /* writepage */ NULL, /* bmap */ NULL, /* truncate */ NULL /* permission */ }; /* * The root /proc directory is special, as it has the * <pid> directories. Thus we don't use the generic * directory handling functions for that.. */ static struct file_operations proc_root_operations = { NULL, /* lseek - default */ NULL, /* read - bad */ NULL, /* write - bad */ proc_root_readdir, /* readdir */ NULL, /* poll - default */ NULL, /* ioctl - default */ NULL, /* mmap */ NULL, /* no special open code */ NULL, /* flush */ NULL, /* no special release code */ NULL /* no fsync */ }; /* * proc root can do almost nothing.. */ static struct inode_operations proc_root_inode_operations = { &proc_root_operations, /* default base directory file-ops */ NULL, /* create */ proc_root_lookup, /* lookup */ NULL, /* link */ NULL, /* unlink */ NULL, /* symlink */ NULL, /* mkdir */ NULL, /* rmdir */ NULL, /* mknod */ NULL, /* rename */ NULL, /* readlink */ NULL, /* follow_link */ NULL, /* readpage */ NULL, /* writepage */ NULL, /* bmap */ NULL, /* truncate */ NULL /* permission */ }; /* * This is the root "inode" in the /proc tree.. */ struct proc_dir_entry proc_root = { PROC_ROOT_INO, 5, "/proc", S_IFDIR | S_IRUGO | S_IXUGO, 2, 0, 0, 0, &proc_root_inode_operations, NULL, NULL, NULL, &proc_root, NULL }; struct proc_dir_entry *proc_net, *proc_scsi, *proc_bus; #ifdef CONFIG_MCA struct proc_dir_entry proc_mca = { PROC_MCA, 3, "mca", S_IFDIR | S_IRUGO | S_IXUGO, 2, 0, 0, 0, &proc_dir_inode_operations, NULL, NULL, NULL, &proc_root, NULL }; #endif #ifdef CONFIG_SYSCTL struct proc_dir_entry proc_sys_root = { PROC_SYS, 3, "sys", /* inode, name */ S_IFDIR | S_IRUGO | S_IXUGO, 2, 0, 0, /* mode, nlink, uid, gid */ 0, &proc_dir_inode_operations, /* size, ops */ NULL, NULL, /* get_info, fill_inode */ NULL, /* next */ NULL, NULL /* parent, subdir */ }; #endif #if defined(CONFIG_SUN_OPENPROMFS) || defined(CONFIG_SUN_OPENPROMFS_MODULE) static int (*proc_openprom_defreaddir_ptr)(struct file *, void *, filldir_t); static struct dentry * (*proc_openprom_deflookup_ptr)(struct inode *, struct dentry *); void (*proc_openprom_use)(struct inode *, int) = 0; static struct openpromfs_dev *proc_openprom_devices = NULL; static ino_t proc_openpromdev_ino = PROC_OPENPROMD_FIRST; struct inode_operations * proc_openprom_register(int (*readdir)(struct file *, void *, filldir_t), struct dentry * (*lookup)(struct inode *, struct dentry *), void (*use)(struct inode *, int), struct openpromfs_dev ***devices) { proc_openprom_defreaddir_ptr = (proc_openprom_inode_operations.default_file_ops)->readdir; proc_openprom_deflookup_ptr = proc_openprom_inode_operations.lookup; (proc_openprom_inode_operations.default_file_ops)->readdir = readdir; proc_openprom_inode_operations.lookup = lookup; proc_openprom_use = use; *devices = &proc_openprom_devices; return &proc_openprom_inode_operations; } int proc_openprom_regdev(struct openpromfs_dev *d) { if (proc_openpromdev_ino == PROC_OPENPROMD_FIRST + PROC_NOPENPROMD) return -1; d->next = proc_openprom_devices; d->inode = proc_openpromdev_ino++; proc_openprom_devices = d; return 0; } int proc_openprom_unregdev(struct openpromfs_dev *d) { if (d == proc_openprom_devices) { proc_openprom_devices = d->next; } else if (!proc_openprom_devices) return -1; else { struct openpromfs_dev *p; for (p = proc_openprom_devices; p->next != d && p->next; p = p->next); if (!p->next) return -1; p->next = d->next; } return 0; } #ifdef CONFIG_SUN_OPENPROMFS_MODULE void proc_openprom_deregister(void) { (proc_openprom_inode_operations.default_file_ops)->readdir = proc_openprom_defreaddir_ptr; proc_openprom_inode_operations.lookup = proc_openprom_deflookup_ptr; proc_openprom_use = 0; } #endif #if defined(CONFIG_SUN_OPENPROMFS_MODULE) && defined(CONFIG_KMOD) static int proc_openprom_defreaddir(struct file * filp, void * dirent, filldir_t filldir) { request_module("openpromfs"); if ((proc_openprom_inode_operations.default_file_ops)->readdir != proc_openprom_defreaddir) return (proc_openprom_inode_operations.default_file_ops)->readdir (filp, dirent, filldir); return -EINVAL; } #define OPENPROM_DEFREADDIR proc_openprom_defreaddir static struct dentry * proc_openprom_deflookup(struct inode * dir, struct dentry *dentry) { request_module("openpromfs"); if (proc_openprom_inode_operations.lookup != proc_openprom_deflookup) return proc_openprom_inode_operations.lookup (dir, dentry); return ERR_PTR(-ENOENT); } #define OPENPROM_DEFLOOKUP proc_openprom_deflookup #else #define OPENPROM_DEFREADDIR NULL #define OPENPROM_DEFLOOKUP NULL #endif static struct file_operations proc_openprom_operations = { NULL, /* lseek - default */ NULL, /* read - bad */ NULL, /* write - bad */ OPENPROM_DEFREADDIR, /* readdir */ NULL, /* poll - default */ NULL, /* ioctl - default */ NULL, /* mmap */ NULL, /* no special open code */ NULL, /* flush */ NULL, /* no special release code */ NULL /* can't fsync */ }; struct inode_operations proc_openprom_inode_operations = { &proc_openprom_operations,/* default net directory file-ops */ NULL, /* create */ OPENPROM_DEFLOOKUP, /* lookup */ NULL, /* link */ NULL, /* unlink */ NULL, /* symlink */ NULL, /* mkdir */ NULL, /* rmdir */ NULL, /* mknod */ NULL, /* rename */ NULL, /* readlink */ NULL, /* follow_link */ NULL, /* readpage */ NULL, /* writepage */ NULL, /* bmap */ NULL, /* truncate */ NULL /* permission */ }; struct proc_dir_entry proc_openprom = { PROC_OPENPROM, 8, "openprom", S_IFDIR | S_IRUGO | S_IXUGO, 2, 0, 0, 0, &proc_openprom_inode_operations, NULL, NULL, NULL, &proc_root, NULL }; extern void openpromfs_init (void); #endif /* CONFIG_SUN_OPENPROMFS */ static int make_inode_number(void) { int i = find_first_zero_bit((void *) proc_alloc_map, PROC_NDYNAMIC); if (i<0 || i>=PROC_NDYNAMIC) return -1; set_bit(i, (void *) proc_alloc_map); return PROC_DYNAMIC_FIRST + i; } int proc_register(struct proc_dir_entry * dir, struct proc_dir_entry * dp) { int i; if (dp->low_ino == 0) { i = make_inode_number(); if (i < 0) return -EAGAIN; dp->low_ino = i; } dp->next = dir->subdir; dp->parent = dir; dir->subdir = dp; if (S_ISDIR(dp->mode)) { if (dp->ops == NULL) dp->ops = &proc_dir_inode_operations; dir->nlink++; } else if (S_ISLNK(dp->mode)) { if (dp->ops == NULL) dp->ops = &proc_link_inode_operations; } else { if (dp->ops == NULL) dp->ops = &proc_file_inode_operations; } return 0; } /* * Kill an inode that got unregistered.. */ static void proc_kill_inodes(int ino) { struct file *filp; /* inuse_filps is protected by the single kernel lock */ for (filp = inuse_filps; filp; filp = filp->f_next) { struct dentry * dentry; struct inode * inode; dentry = filp->f_dentry; if (!dentry) continue; if (dentry->d_op != &proc_dentry_operations) continue; inode = dentry->d_inode; if (!inode) continue; if (inode->i_ino != ino) continue; filp->f_op = NULL; } } int proc_unregister(struct proc_dir_entry * dir, int ino) { struct proc_dir_entry **p = &dir->subdir, *dp; while ((dp = *p) != NULL) { if (dp->low_ino == ino) { *p = dp->next; dp->next = NULL; if (S_ISDIR(dp->mode)) dir->nlink--; if (ino >= PROC_DYNAMIC_FIRST && ino < PROC_DYNAMIC_FIRST+PROC_NDYNAMIC) clear_bit(ino-PROC_DYNAMIC_FIRST, (void *) proc_alloc_map); proc_kill_inodes(ino); return 0; } p = &dp->next; } return -EINVAL; } /* * /proc/self: */ static int proc_self_readlink(struct dentry *dentry, char *buffer, int buflen) { int len; char tmp[30]; len = sprintf(tmp, "%d", current->pid); if (buflen < len) len = buflen; copy_to_user(buffer, tmp, len); return len; } static struct dentry * proc_self_follow_link(struct dentry *dentry, struct dentry *base, unsigned int follow) { char tmp[30]; sprintf(tmp, "%d", current->pid); return lookup_dentry(tmp, base, follow); } int proc_readlink(struct dentry * dentry, char * buffer, int buflen) { struct inode *inode = dentry->d_inode; struct proc_dir_entry * de; char *page; int len = 0; de = (struct proc_dir_entry *) inode->u.generic_ip; if (!de) return -ENOENT; if (!(page = (char*) __get_free_page(GFP_KERNEL))) return -ENOMEM; if (de->readlink_proc) len = de->readlink_proc(de, page); if (len > buflen) len = buflen; copy_to_user(buffer, page, len); free_page((unsigned long) page); return len; } struct dentry * proc_follow_link(struct dentry * dentry, struct dentry *base, unsigned int follow) { struct inode *inode = dentry->d_inode; struct proc_dir_entry * de; char *page; struct dentry *d; int len = 0; de = (struct proc_dir_entry *) inode->u.generic_ip; if (!(page = (char*) __get_free_page(GFP_KERNEL))) return NULL; if (de->readlink_proc) len = de->readlink_proc(de, page); d = lookup_dentry(page, base, follow); free_page((unsigned long) page); return d; } static struct inode_operations proc_self_inode_operations = { NULL, /* no file-ops */ NULL, /* create */ NULL, /* lookup */ NULL, /* link */ NULL, /* unlink */ NULL, /* symlink */ NULL, /* mkdir */ NULL, /* rmdir */ NULL, /* mknod */ NULL, /* rename */ proc_self_readlink, /* readlink */ proc_self_follow_link, /* follow_link */ NULL, /* readpage */ NULL, /* writepage */ NULL, /* bmap */ NULL, /* truncate */ NULL /* permission */ }; static struct inode_operations proc_link_inode_operations = { NULL, /* no file-ops */ NULL, /* create */ NULL, /* lookup */ NULL, /* link */ NULL, /* unlink */ NULL, /* symlink */ NULL, /* mkdir */ NULL, /* rmdir */ NULL, /* mknod */ NULL, /* rename */ proc_readlink, /* readlink */ proc_follow_link, /* follow_link */ NULL, /* readpage */ NULL, /* writepage */ NULL, /* bmap */ NULL, /* truncate */ NULL /* permission */ }; static struct proc_dir_entry proc_root_loadavg = { PROC_LOADAVG, 7, "loadavg", S_IFREG | S_IRUGO, 1, 0, 0, 0, &proc_array_inode_operations }; static struct proc_dir_entry proc_root_uptime = { PROC_UPTIME, 6, "uptime", S_IFREG | S_IRUGO, 1, 0, 0, 0, &proc_array_inode_operations }; static struct proc_dir_entry proc_root_meminfo = { PROC_MEMINFO, 7, "meminfo", S_IFREG | S_IRUGO, 1, 0, 0, 0, &proc_array_inode_operations }; static struct proc_dir_entry proc_root_kmsg = { PROC_KMSG, 4, "kmsg", S_IFREG | S_IRUSR, 1, 0, 0, 0, &proc_kmsg_inode_operations }; static struct proc_dir_entry proc_root_version = { PROC_VERSION, 7, "version", S_IFREG | S_IRUGO, 1, 0, 0, 0, &proc_array_inode_operations }; static struct proc_dir_entry proc_root_cpuinfo = { PROC_CPUINFO, 7, "cpuinfo", S_IFREG | S_IRUGO, 1, 0, 0, 0, &proc_array_inode_operations }; #if defined (CONFIG_PROC_HARDWARE) static struct proc_dir_entry proc_root_hardware = { PROC_HARDWARE, 8, "hardware", S_IFREG | S_IRUGO, 1, 0, 0, 0, &proc_array_inode_operations }; #endif #ifdef CONFIG_STRAM_PROC static struct proc_dir_entry proc_root_stram = { PROC_STRAM, 5, "stram", S_IFREG | S_IRUGO, 1, 0, 0, 0, &proc_array_inode_operations }; #endif static struct proc_dir_entry proc_root_self = { PROC_SELF, 4, "self", S_IFLNK | S_IRUGO | S_IWUGO | S_IXUGO, 1, 0, 0, 64, &proc_self_inode_operations, }; #ifdef CONFIG_DEBUG_MALLOC static struct proc_dir_entry proc_root_malloc = { PROC_MALLOC, 6, "malloc", S_IFREG | S_IRUGO, 1, 0, 0, 0, &proc_array_inode_operations }; #endif static struct proc_dir_entry proc_root_kcore = { PROC_KCORE, 5, "kcore", S_IFREG | S_IRUSR, 1, 0, 0, 0, &proc_kcore_inode_operations }; #ifdef CONFIG_MODULES static struct proc_dir_entry proc_root_modules = { PROC_MODULES, 7, "modules", S_IFREG | S_IRUGO, 1, 0, 0, 0, &proc_array_inode_operations }; static struct proc_dir_entry proc_root_ksyms = { PROC_KSYMS, 5, "ksyms", S_IFREG | S_IRUGO, 1, 0, 0, 0, &proc_array_inode_operations }; #endif static struct proc_dir_entry proc_root_stat = { PROC_STAT, 4, "stat", S_IFREG | S_IRUGO, 1, 0, 0, 0, &proc_array_inode_operations }; static struct proc_dir_entry proc_root_devices = { PROC_DEVICES, 7, "devices", S_IFREG | S_IRUGO, 1, 0, 0, 0, &proc_array_inode_operations }; static struct proc_dir_entry proc_root_partitions = { PROC_PARTITIONS, 10, "partitions", S_IFREG | S_IRUGO, 1, 0, 0, 0, &proc_array_inode_operations }; static struct proc_dir_entry proc_root_interrupts = { PROC_INTERRUPTS, 10,"interrupts", S_IFREG | S_IRUGO, 1, 0, 0, 0, &proc_array_inode_operations }; static struct proc_dir_entry proc_root_filesystems = { PROC_FILESYSTEMS, 11,"filesystems", S_IFREG | S_IRUGO, 1, 0, 0, 0, &proc_array_inode_operations }; struct proc_dir_entry proc_root_fs = { PROC_FS, 2, "fs", S_IFDIR | S_IRUGO | S_IXUGO, 2, 0, 0, 0, &proc_dir_inode_operations, NULL, NULL, NULL, NULL, NULL }; static struct proc_dir_entry proc_root_dma = { PROC_DMA, 3, "dma", S_IFREG | S_IRUGO, 1, 0, 0, 0, &proc_array_inode_operations }; static struct proc_dir_entry proc_root_ioports = { PROC_IOPORTS, 7, "ioports", S_IFREG | S_IRUGO, 1, 0, 0, 0, &proc_array_inode_operations }; static struct proc_dir_entry proc_root_cmdline = { PROC_CMDLINE, 7, "cmdline", S_IFREG | S_IRUGO, 1, 0, 0, 0, &proc_array_inode_operations }; #ifdef CONFIG_RTC static struct proc_dir_entry proc_root_rtc = { PROC_RTC, 3, "rtc", S_IFREG | S_IRUGO, 1, 0, 0, 0, &proc_array_inode_operations }; #endif #ifdef CONFIG_SGI_DS1286 static struct proc_dir_entry proc_root_ds1286 = { PROC_RTC, 3, "rtc", S_IFREG | S_IRUGO, 1, 0, 0, 0, &proc_array_inode_operations }; #endif static struct proc_dir_entry proc_root_locks = { PROC_LOCKS, 5, "locks", S_IFREG | S_IRUGO, 1, 0, 0, 0, &proc_array_inode_operations }; static struct proc_dir_entry proc_root_mounts = { PROC_MTAB, 6, "mounts", S_IFREG | S_IRUGO, 1, 0, 0, 0, &proc_array_inode_operations }; static struct proc_dir_entry proc_root_swaps = { PROC_SWAP, 5, "swaps", S_IFREG | S_IRUGO, 1, 0, 0, 0, &proc_array_inode_operations }; static struct proc_dir_entry proc_root_profile = { PROC_PROFILE, 7, "profile", S_IFREG | S_IRUGO | S_IWUSR, 1, 0, 0, 0, &proc_profile_inode_operations }; static struct proc_dir_entry proc_root_slab = { PROC_SLABINFO, 8, "slabinfo", S_IFREG | S_IRUGO, 1, 0, 0, 0, &proc_array_inode_operations }; #ifdef __powerpc__ static struct proc_dir_entry proc_root_ppc_htab = { PROC_PPC_HTAB, 8, "ppc_htab", S_IFREG | S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH, 1, 0, 0, 0, &proc_ppc_htab_inode_operations, NULL, NULL, /* get_info, fill_inode */ NULL, /* next */ NULL, NULL /* parent, subdir */ }; #endif __initfunc(void proc_root_init(void)) { proc_base_init(); proc_register(&proc_root, &proc_root_loadavg); proc_register(&proc_root, &proc_root_uptime); proc_register(&proc_root, &proc_root_meminfo); proc_register(&proc_root, &proc_root_kmsg); proc_register(&proc_root, &proc_root_version); proc_register(&proc_root, &proc_root_cpuinfo); proc_register(&proc_root, &proc_root_self); proc_net = create_proc_entry("net", S_IFDIR, 0); proc_scsi = create_proc_entry("scsi", S_IFDIR, 0); #ifdef CONFIG_SYSCTL proc_register(&proc_root, &proc_sys_root); #endif #ifdef CONFIG_MCA proc_register(&proc_root, &proc_mca); #endif #ifdef CONFIG_DEBUG_MALLOC proc_register(&proc_root, &proc_root_malloc); #endif proc_register(&proc_root, &proc_root_kcore); proc_root_kcore.size = (MAP_NR(high_memory) << PAGE_SHIFT) + PAGE_SIZE; #ifdef CONFIG_MODULES proc_register(&proc_root, &proc_root_modules); proc_register(&proc_root, &proc_root_ksyms); #endif proc_register(&proc_root, &proc_root_stat); proc_register(&proc_root, &proc_root_devices); proc_register(&proc_root, &proc_root_partitions); proc_register(&proc_root, &proc_root_interrupts); proc_register(&proc_root, &proc_root_filesystems); proc_register(&proc_root, &proc_root_fs); proc_register(&proc_root, &proc_root_dma); proc_register(&proc_root, &proc_root_ioports); proc_register(&proc_root, &proc_root_cmdline); #ifdef CONFIG_RTC proc_register(&proc_root, &proc_root_rtc); #endif #ifdef CONFIG_SGI_DS1286 proc_register(&proc_root, &proc_root_ds1286); #endif proc_register(&proc_root, &proc_root_locks); proc_register(&proc_root, &proc_root_mounts); proc_register(&proc_root, &proc_root_swaps); #if defined(CONFIG_SUN_OPENPROMFS) || defined(CONFIG_SUN_OPENPROMFS_MODULE) #ifdef CONFIG_SUN_OPENPROMFS openpromfs_init (); #endif proc_register(&proc_root, &proc_openprom); #endif #ifdef CONFIG_PROC_HARDWARE proc_register(&proc_root, &proc_root_hardware); #endif #ifdef CONFIG_STRAM_PROC proc_register(&proc_root, &proc_root_stram); #endif proc_register(&proc_root, &proc_root_slab); if (prof_shift) { proc_register(&proc_root, &proc_root_profile); proc_root_profile.size = (1+prof_len) * sizeof(unsigned int); } proc_tty_init(); #ifdef __powerpc__ proc_register(&proc_root, &proc_root_ppc_htab); #endif #ifdef CONFIG_PROC_DEVICETREE proc_device_tree_init(); #endif proc_bus = create_proc_entry("bus", S_IFDIR, 0); } /* * As some entries in /proc are volatile, we want to * get rid of unused dentries. This could be made * smarter: we could keep a "volatile" flag in the * inode to indicate which ones to keep. */ static void proc_delete_dentry(struct dentry * dentry) { d_drop(dentry); } struct dentry_operations proc_dentry_operations = { NULL, /* revalidate */ NULL, /* d_hash */ NULL, /* d_compare */ proc_delete_dentry /* d_delete(struct dentry *) */ }; /* * Don't create negative dentries here, return -ENOENT by hand * instead. */ struct dentry *proc_lookup(struct inode * dir, struct dentry *dentry) { struct inode *inode; struct proc_dir_entry * de; int error; error = -ENOENT; inode = NULL; de = (struct proc_dir_entry *) dir->u.generic_ip; if (de) { for (de = de->subdir; de ; de = de->next) { if (!de || !de->low_ino) continue; if (de->namelen != dentry->d_name.len) continue; if (!memcmp(dentry->d_name.name, de->name, de->namelen)) { int ino = de->low_ino | (dir->i_ino & ~(0xffff)); error = -EINVAL; inode = proc_get_inode(dir->i_sb, ino, de); break; } } } if (inode) { dentry->d_op = &proc_dentry_operations; d_add(dentry, inode); return NULL; } return ERR_PTR(error); } static struct dentry *proc_root_lookup(struct inode * dir, struct dentry * dentry) { unsigned int pid, c; struct task_struct *p; const char *name; struct inode *inode; int len; if (dir->i_ino == PROC_ROOT_INO) { /* check for safety... */ dir->i_nlink = proc_root.nlink; read_lock(&tasklist_lock); for_each_task(p) { if (p->pid) dir->i_nlink++; } read_unlock(&tasklist_lock); } if (!proc_lookup(dir, dentry)) return NULL; pid = 0; name = dentry->d_name.name; len = dentry->d_name.len; while (len-- > 0) { c = *name - '0'; name++; if (c > 9) { pid = 0; break; } pid *= 10; pid += c; if (!pid) break; if (pid & 0xffff0000) { pid = 0; break; } } read_lock(&tasklist_lock); p = find_task_by_pid(pid); read_unlock(&tasklist_lock); inode = NULL; if (pid && p) { unsigned long ino = (pid << 16) + PROC_PID_INO; inode = proc_get_inode(dir->i_sb, ino, &proc_pid); if (!inode) return ERR_PTR(-EINVAL); inode->i_flags|=S_IMMUTABLE; } dentry->d_op = &proc_dentry_operations; d_add(dentry, inode); return NULL; } /* * This returns non-zero if at EOF, so that the /proc * root directory can use this and check if it should * continue with the <pid> entries.. * * Note that the VFS-layer doesn't care about the return * value of the readdir() call, as long as it's non-negative * for success.. */ int proc_readdir(struct file * filp, void * dirent, filldir_t filldir) { struct proc_dir_entry * de; unsigned int ino; int i; struct inode *inode = filp->f_dentry->d_inode; ino = inode->i_ino; de = (struct proc_dir_entry *) inode->u.generic_ip; if (!de) return -EINVAL; i = filp->f_pos; switch (i) { case 0: if (filldir(dirent, ".", 1, i, ino) < 0) return 0; i++; filp->f_pos++; /* fall through */ case 1: if (filldir(dirent, "..", 2, i, de->parent->low_ino) < 0) return 0; i++; filp->f_pos++; /* fall through */ default: ino &= ~0xffff; de = de->subdir; i -= 2; for (;;) { if (!de) return 1; if (!i) break; de = de->next; i--; } do { if (filldir(dirent, de->name, de->namelen, filp->f_pos, ino | de->low_ino) < 0) return 0; filp->f_pos++; de = de->next; } while (de); } return 1; } #define PROC_NUMBUF 10 #define PROC_MAXPIDS 20 /* * Get a few pid's to return for filldir - we need to hold the * tasklist lock while doing this, and we must release it before * we actually do the filldir itself, so we use a temp buffer.. */ static int get_pid_list(int index, unsigned int *pids) { struct task_struct *p; int nr_pids = 0; index -= FIRST_PROCESS_ENTRY; read_lock(&tasklist_lock); for_each_task(p) { int pid = p->pid; if (!pid) continue; if (--index >= 0) continue; pids[nr_pids] = pid; nr_pids++; if (nr_pids >= PROC_MAXPIDS) break; } read_unlock(&tasklist_lock); return nr_pids; } static int proc_root_readdir(struct file * filp, void * dirent, filldir_t filldir) { unsigned int pid_array[PROC_MAXPIDS]; char buf[PROC_NUMBUF]; unsigned int nr = filp->f_pos; unsigned int nr_pids, i; if (nr < FIRST_PROCESS_ENTRY) { int error = proc_readdir(filp, dirent, filldir); if (error <= 0) return error; filp->f_pos = nr = FIRST_PROCESS_ENTRY; } nr_pids = get_pid_list(nr, pid_array); for (i = 0; i < nr_pids; i++) { int pid = pid_array[i]; ino_t ino = (pid << 16) + PROC_PID_INO; unsigned long j = PROC_NUMBUF; do { j--; buf[j] = '0' + (pid % 10); pid /= 10; } while (pid); if (filldir(dirent, buf+j, PROC_NUMBUF-j, filp->f_pos, ino) < 0) break; filp->f_pos++; } return 0; } static int proc_unlink(struct inode *dir, struct dentry *dentry) { struct proc_dir_entry * dp = dir->u.generic_ip; printk("proc_file_unlink: deleting %s/%s\n", dp->name, dentry->d_name.name); remove_proc_entry(dentry->d_name.name, dp); dentry->d_inode->i_nlink = 0; d_delete(dentry); return 0; } |