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[/] [or1k_old/] [trunk/] [uclinux/] [uClinux-2.0.x/] [fs/] [autofs/] [root.c] - Rev 199
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/* -*- linux-c -*- --------------------------------------------------------- * * * linux/fs/autofs/root.c * * Copyright 1997 Transmeta Corporation -- All Rights Reserved * * This file is part of the Linux kernel and is made available under * the terms of the GNU General Public License, version 2, or at your * option, any later version, incorporated herein by reference. * * ------------------------------------------------------------------------- */ #include <linux/errno.h> #include <linux/stat.h> #include <linux/param.h> #include "autofs_i.h" static int autofs_root_readdir(struct inode *,struct file *,void *,filldir_t); static int autofs_root_lookup(struct inode *,const char *,int,struct inode **); static int autofs_root_symlink(struct inode *,const char *,int,const char *); static int autofs_root_unlink(struct inode *,const char *,int); static int autofs_root_rmdir(struct inode *,const char *,int); static int autofs_root_mkdir(struct inode *,const char *,int,int); static int autofs_root_ioctl(struct inode *, struct file *,unsigned int,unsigned long); static struct file_operations autofs_root_operations = { NULL, /* lseek */ NULL, /* read */ NULL, /* write */ autofs_root_readdir, /* readdir */ NULL, /* select */ autofs_root_ioctl, /* ioctl */ NULL, /* mmap */ NULL, /* open */ NULL, /* release */ NULL /* fsync */ }; struct inode_operations autofs_root_inode_operations = { &autofs_root_operations, /* file operations */ NULL, /* create */ autofs_root_lookup, /* lookup */ NULL, /* link */ autofs_root_unlink, /* unlink */ autofs_root_symlink, /* symlink */ autofs_root_mkdir, /* mkdir */ autofs_root_rmdir, /* rmdir */ NULL, /* mknod */ NULL, /* rename */ NULL, /* readlink */ NULL, /* follow_link */ NULL, /* readpage */ NULL, /* writepage */ NULL, /* bmap */ NULL, /* truncate */ NULL /* permission */ }; static int autofs_root_readdir(struct inode *inode, struct file *filp, void *dirent, filldir_t filldir) { struct autofs_dir_ent *ent; struct autofs_dirhash *dirhash; off_t onr, nr; if (!inode || !S_ISDIR(inode->i_mode)) return -ENOTDIR; dirhash = &((struct autofs_sb_info *)inode->i_sb->u.generic_sbp)->dirhash; nr = filp->f_pos; switch(nr) { case 0: if (filldir(dirent, ".", 1, nr, inode->i_ino) < 0) return 0; filp->f_pos = ++nr; /* fall through */ case 1: if (filldir(dirent, "..", 2, nr, inode->i_ino) < 0) return 0; filp->f_pos = ++nr; /* fall through */ default: while ( onr = nr, ent = autofs_hash_enum(dirhash,&nr) ) { if (filldir(dirent,ent->name,ent->len,onr,ent->ino) < 0) return 0; filp->f_pos = nr; } break; } return 0; } static int autofs_root_lookup(struct inode *dir, const char *name, int len, struct inode **result) { struct autofs_sb_info *sbi; struct autofs_dir_ent *ent; struct inode *res; autofs_hash_t hash; int status, oz_mode; DPRINTK(("autofs_root_lookup: name = ")); autofs_say(name,len); *result = NULL; if (!dir) return -ENOENT; if (len > NAME_MAX) return -ENOENT; if (!S_ISDIR(dir->i_mode)) { iput(dir); return -ENOTDIR; } /* Handle special cases: . and ..; since this is a root directory, they both point to the inode itself */ *result = dir; if (!len) return 0; if (name[0] == '.') { if (len == 1) return 0; if (name[1] == '.' && len == 2) return 0; } *result = res = NULL; sbi = (struct autofs_sb_info *) dir->i_sb->u.generic_sbp; hash = autofs_hash(name,len); oz_mode = autofs_oz_mode(sbi); DPRINTK(("autofs_lookup: pid = %u, pgrp = %u, catatonic = %d, oz_mode = %d\n", current->pid, current->pgrp, sbi->catatonic, oz_mode)); do { while ( !(ent = autofs_hash_lookup(&sbi->dirhash,hash,name,len)) ) { DPRINTK(("lookup failed, pid = %u, pgrp = %u\n", current->pid, current->pgrp)); if ( oz_mode ) { iput(dir); return -ENOENT; } else { status = autofs_wait(sbi,hash,name,len); DPRINTK(("autofs_wait returned %d\n", status)); if ( status ) { iput(dir); return status; } } } DPRINTK(("lookup successful, inode = %08x\n", (unsigned int)ent->ino)); if (!(res = iget(dir->i_sb,ent->ino))) { printk("autofs: iget returned null!\n"); iput(dir); return -EACCES; } if ( !oz_mode && S_ISDIR(res->i_mode) && res->i_sb == dir->i_sb ) { /* Not a mount point yet, call 1-800-DAEMON */ DPRINTK(("autofs: waiting on non-mountpoint dir, inode = %lu, pid = %u, pgrp = %u\n", res->i_ino, current->pid, current->pgrp)); iput(res); res = NULL; status = autofs_wait(sbi,hash,name,len); if ( status ) { iput(dir); return status; } } } while(!res); autofs_update_usage(&sbi->dirhash,ent); *result = res; iput(dir); return 0; } static int autofs_root_symlink(struct inode *dir, const char *name, int len, const char *symname) { struct autofs_sb_info *sbi = (struct autofs_sb_info *) dir->i_sb->u.generic_sbp; struct autofs_dirhash *dh = &sbi->dirhash; autofs_hash_t hash = autofs_hash(name,len); struct autofs_dir_ent *ent; unsigned int n; int slsize; struct autofs_symlink *sl; DPRINTK(("autofs_root_symlink: %s <- ", symname)); autofs_say(name,len); if ( !autofs_oz_mode(sbi) ) { iput(dir); return -EPERM; } if ( len > NAME_MAX) return -ENAMETOOLONG; if ( autofs_hash_lookup(dh,hash,name,len) ) { iput(dir); return -EEXIST; } n = find_first_zero_bit(sbi->symlink_bitmap,AUTOFS_MAX_SYMLINKS); if ( n >= AUTOFS_MAX_SYMLINKS ) { iput(dir); return -ENOSPC; } set_bit(n,sbi->symlink_bitmap); sl = &sbi->symlink[n]; sl->len = strlen(symname); sl->data = kmalloc(slsize = sl->len+1, GFP_KERNEL); if ( !sl->data ) { clear_bit(n,sbi->symlink_bitmap); iput(dir); return -ENOSPC; } ent = kmalloc(sizeof(struct autofs_dir_ent), GFP_KERNEL); if ( !ent ) { kfree(sl->data); clear_bit(n,sbi->symlink_bitmap); iput(dir); return -ENOSPC; } ent->name = kmalloc(len, GFP_KERNEL); if ( !ent->name ) { kfree(sl->data); kfree(ent); clear_bit(n,sbi->symlink_bitmap); iput(dir); return -ENOSPC; } memcpy(sl->data,symname,slsize); sl->mtime = CURRENT_TIME; ent->ino = AUTOFS_FIRST_SYMLINK + n; ent->hash = hash; memcpy(ent->name,name,ent->len = len); autofs_hash_insert(dh,ent); iput(dir); return 0; } static int autofs_root_unlink(struct inode *dir, const char *name, int len) { struct autofs_sb_info *sbi = (struct autofs_sb_info *) dir->i_sb->u.generic_sbp; struct autofs_dirhash *dh = &sbi->dirhash; autofs_hash_t hash = autofs_hash(name,len); struct autofs_dir_ent *ent; unsigned int n; iput(dir); /* Nothing below can sleep */ if ( !autofs_oz_mode(sbi) ) return -EPERM; if(len > NAME_MAX) return -ENAMETOOLONG; ent = autofs_hash_lookup(dh,hash,name,len); if ( !ent ) return -ENOENT; n = ent->ino - AUTOFS_FIRST_SYMLINK; if ( n >= AUTOFS_MAX_SYMLINKS || !test_bit(n,sbi->symlink_bitmap) ) return -EINVAL; /* Not a symlink inode, can't unlink */ autofs_hash_delete(ent); clear_bit(n,sbi->symlink_bitmap); kfree(sbi->symlink[n].data); return 0; } static int autofs_root_rmdir(struct inode *dir, const char *name, int len) { struct autofs_sb_info *sbi = (struct autofs_sb_info *) dir->i_sb->u.generic_sbp; struct autofs_dirhash *dh = &sbi->dirhash; autofs_hash_t hash = autofs_hash(name,len); struct autofs_dir_ent *ent; if ( !autofs_oz_mode(sbi) ) { iput(dir); return -EPERM; } ent = autofs_hash_lookup(dh,hash,name,len); if ( !ent ) { iput(dir); return -ENOENT; } if ( (unsigned int)ent->ino < AUTOFS_FIRST_DIR_INO ) { iput(dir); return -ENOTDIR; /* Not a directory */ } autofs_hash_delete(ent); dir->i_nlink--; iput(dir); return 0; } static int autofs_root_mkdir(struct inode *dir, const char *name, int len, int mode) { struct autofs_sb_info *sbi = (struct autofs_sb_info *) dir->i_sb->u.generic_sbp; struct autofs_dirhash *dh = &sbi->dirhash; autofs_hash_t hash = autofs_hash(name,len); struct autofs_dir_ent *ent; if ( !autofs_oz_mode(sbi) ) { iput(dir); return -EPERM; } ent = autofs_hash_lookup(dh,hash,name,len); if ( ent ) { iput(dir); return -EEXIST; } if ( sbi->next_dir_ino < AUTOFS_FIRST_DIR_INO ) { printk("autofs: Out of inode numbers -- what the heck did you do??\n"); iput(dir); return -ENOSPC; } ent = kmalloc(sizeof(struct autofs_dir_ent), GFP_KERNEL); if ( !ent ) { iput(dir); return -ENOSPC; } ent->name = kmalloc(len, GFP_KERNEL); if ( !ent->name ) { kfree(ent); iput(dir); return -ENOSPC; } ent->hash = hash; memcpy(ent->name, name, ent->len = len); ent->ino = sbi->next_dir_ino++; autofs_hash_insert(dh,ent); dir->i_nlink++; iput(dir); return 0; } /* Get/set timeout ioctl() operation */ static inline int autofs_get_set_timeout(struct autofs_sb_info *sbi, unsigned long *p) { int rv; unsigned long ntimeout; #if LINUX_VERSION_CODE < kver(2,1,0) if ( (rv = verify_area(VERIFY_WRITE, p, sizeof(unsigned long))) ) return rv; ntimeout = get_user(p); put_user(sbi->exp_timeout/HZ, p); #else if ( (rv = get_user(ntimeout, p)) || (rv = put_user(sbi->exp_timeout/HZ, p)) ) return rv; #endif if ( ntimeout > ULONG_MAX/HZ ) sbi->exp_timeout = 0; else sbi->exp_timeout = ntimeout * HZ; return 0; } /* Return protocol version */ static inline int autofs_get_protover(int *p) { #if LINUX_VERSION_CODE < kver(2,1,0) int rv; if ( (rv = verify_area(VERIFY_WRITE, p, sizeof(int))) ) return rv; put_user(AUTOFS_PROTO_VERSION, p); return 0; #else return put_user(AUTOFS_PROTO_VERSION, p); #endif } /* Perform an expiry operation */ static inline int autofs_expire_run(struct autofs_sb_info *sbi, struct autofs_packet_expire *pkt_p) { struct autofs_dir_ent *ent; struct autofs_packet_expire pkt; struct autofs_dirhash *dh = &(sbi->dirhash); memset(&pkt,0,sizeof pkt); pkt.hdr.proto_version = AUTOFS_PROTO_VERSION; pkt.hdr.type = autofs_ptype_expire; if ( !sbi->exp_timeout || !(ent = autofs_expire(dh,sbi->exp_timeout)) ) return -EAGAIN; pkt.len = ent->len; memcpy(pkt.name, ent->name, pkt.len); pkt.name[pkt.len] = '\0'; if ( copy_to_user(pkt_p, &pkt, sizeof(struct autofs_packet_expire)) ) return -EFAULT; autofs_update_usage(dh,ent); return 0; } /* * ioctl()'s on the root directory is the chief method for the daemon to * generate kernel reactions */ static int autofs_root_ioctl(struct inode *inode, struct file *filp, unsigned int cmd, unsigned long arg) { struct autofs_sb_info *sbi = (struct autofs_sb_info *)inode->i_sb->u.generic_sbp; DPRINTK(("autofs_ioctl: cmd = 0x%08x, arg = 0x%08lx, sbi = %p, pgrp = %u\n",cmd,arg,sbi,current->pgrp)); if ( _IOC_TYPE(cmd) != _IOC_TYPE(AUTOFS_IOC_FIRST) || _IOC_NR(cmd) - _IOC_NR(AUTOFS_IOC_FIRST) >= AUTOFS_IOC_COUNT ) return -ENOTTY; if ( !autofs_oz_mode(sbi) && !fsuser() ) return -EPERM; switch(cmd) { case AUTOFS_IOC_READY: /* Wait queue: go ahead and retry */ return autofs_wait_release(sbi,arg,0); case AUTOFS_IOC_FAIL: /* Wait queue: fail with ENOENT */ return autofs_wait_release(sbi,arg,-ENOENT); case AUTOFS_IOC_CATATONIC: /* Enter catatonic mode (daemon shutdown) */ autofs_catatonic_mode(sbi); return 0; case AUTOFS_IOC_PROTOVER: /* Get protocol version */ return autofs_get_protover((int *)arg); case AUTOFS_IOC_SETTIMEOUT: return autofs_get_set_timeout(sbi,(unsigned long *)arg); case AUTOFS_IOC_EXPIRE: return autofs_expire_run(sbi,(struct autofs_packet_expire *)arg); default: return -ENOSYS; } }
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