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[/] [or1k/] [trunk/] [rc203soc/] [sw/] [uClinux/] [fs/] [autofs/] [root.c] - Blame information for rev 1765

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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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[/] [or1k/] [trunk/] [rc203soc/] [sw/] [uClinux/] [fs/] [autofs/] [root.c] - Blame information for rev 1765

Line No.	Rev	Author	Line
1	1628	jcastillo	`/* -- linux-c -- --------------------------------------------------------- *`
2			`*`
3			`* linux/fs/autofs/root.c`
4			`*`
5			`* Copyright 1997 Transmeta Corporation -- All Rights Reserved`
6			`*`
7			`* This file is part of the Linux kernel and is made available under`
8			`* the terms of the GNU General Public License, version 2, or at your`
9			`* option, any later version, incorporated herein by reference.`
10			`*`
11			`* ------------------------------------------------------------------------- */`
12
13			`#include <linux/errno.h>`
14			`#include <linux/stat.h>`
15			`#include <linux/param.h>`
16			`#include "autofs_i.h"`
17
18			`static int autofs_root_readdir(struct inode ,struct file ,void *,filldir_t);`
19			`static int autofs_root_lookup(struct inode ,const char ,int,struct inode **);`
20			`static int autofs_root_symlink(struct inode ,const char ,int,const char *);`
21			`static int autofs_root_unlink(struct inode ,const char ,int);`
22			`static int autofs_root_rmdir(struct inode ,const char ,int);`
23			`static int autofs_root_mkdir(struct inode ,const char ,int,int);`
24			`static int autofs_root_ioctl(struct inode , struct file ,unsigned int,unsigned long);`
25
26			`static struct file_operations autofs_root_operations = {`
27			`NULL, /* lseek */`
28			`NULL, /* read */`
29			`NULL, /* write */`
30			`autofs_root_readdir, /* readdir */`
31			`NULL, /* select */`
32			`autofs_root_ioctl, /* ioctl */`
33			`NULL, /* mmap */`
34			`NULL, /* open */`
35			`NULL, /* release */`
36			`NULL /* fsync */`
37			`};`
38
39			`struct inode_operations autofs_root_inode_operations = {`
40			`&autofs_root_operations, /* file operations */`
41			`NULL, /* create */`
42			`autofs_root_lookup, /* lookup */`
43			`NULL, /* link */`
44			`autofs_root_unlink, /* unlink */`
45			`autofs_root_symlink, /* symlink */`
46			`autofs_root_mkdir, /* mkdir */`
47			`autofs_root_rmdir, /* rmdir */`
48			`NULL, /* mknod */`
49			`NULL, /* rename */`
50			`NULL, /* readlink */`
51			`NULL, /* follow_link */`
52			`NULL, /* readpage */`
53			`NULL, /* writepage */`
54			`NULL, /* bmap */`
55			`NULL, /* truncate */`
56			`NULL /* permission */`
57			`};`
58
59			`static int autofs_root_readdir(struct inode inode, struct file filp,`
60			`void *dirent, filldir_t filldir)`
61			`{`
62			`struct autofs_dir_ent *ent;`
63			`struct autofs_dirhash *dirhash;`
64			`off_t onr, nr;`
65
66			`if (!inode \|\| !S_ISDIR(inode->i_mode))`
67			`return -ENOTDIR;`
68
69			`dirhash = &((struct autofs_sb_info *)inode->i_sb->u.generic_sbp)->dirhash;`
70			`nr = filp->f_pos;`
71
72			`switch(nr)`
73			`{`
74			`case 0:`
75			`if (filldir(dirent, ".", 1, nr, inode->i_ino) < 0)`
76			`return 0;`
77			`filp->f_pos = ++nr;`
78			`/* fall through */`
79			`case 1:`
80			`if (filldir(dirent, "..", 2, nr, inode->i_ino) < 0)`
81			`return 0;`
82			`filp->f_pos = ++nr;`
83			`/* fall through */`
84			`default:`
85			`while ( onr = nr, ent = autofs_hash_enum(dirhash,&nr) ) {`
86			`if (filldir(dirent,ent->name,ent->len,onr,ent->ino) < 0)`
87			`return 0;`
88			`filp->f_pos = nr;`
89			`}`
90			`break;`
91			`}`
92
93			`return 0;`
94			`}`
95
96			`static int autofs_root_lookup(struct inode dir, const char name, int len,`
97			`struct inode **result)`
98			`{`
99			`struct autofs_sb_info *sbi;`
100			`struct autofs_dir_ent *ent;`
101			`struct inode *res;`
102			`autofs_hash_t hash;`
103			`int status, oz_mode;`
104
105			`DPRINTK(("autofs_root_lookup: name = "));`
106			`autofs_say(name,len);`
107
108			`*result = NULL;`
109			`if (!dir)`
110			`return -ENOENT;`
111
112			`if (len > NAME_MAX)`
113			`return -ENOENT;`
114
115			`if (!S_ISDIR(dir->i_mode)) {`
116			`iput(dir);`
117			`return -ENOTDIR;`
118			`}`
119
120			`/* Handle special cases: . and ..; since this is a root directory,`
121			`they both point to the inode itself */`
122			`*result = dir;`
123			`if (!len)`
124			`return 0;`
125			`if (name[0] == '.') {`
126			`if (len == 1)`
127			`return 0;`
128			`if (name[1] == '.' && len == 2)`
129			`return 0;`
130			`}`
131
132			`*result = res = NULL;`
133			`sbi = (struct autofs_sb_info *) dir->i_sb->u.generic_sbp;`
134
135			`hash = autofs_hash(name,len);`
136
137			`oz_mode = autofs_oz_mode(sbi);`
138			`DPRINTK(("autofs_lookup: pid = %u, pgrp = %u, catatonic = %d, oz_mode = %d\n", current->pid, current->pgrp, sbi->catatonic, oz_mode));`
139
140			`do {`
141			`while ( !(ent = autofs_hash_lookup(&sbi->dirhash,hash,name,len)) ) {`
142			`DPRINTK(("lookup failed, pid = %u, pgrp = %u\n", current->pid, current->pgrp));`
143
144			`if ( oz_mode ) {`
145			`iput(dir);`
146			`return -ENOENT;`
147			`} else {`
148			`status = autofs_wait(sbi,hash,name,len);`
149			`DPRINTK(("autofs_wait returned %d\n", status));`
150			`if ( status ) {`
151			`iput(dir);`
152			`return status;`
153			`}`
154			`}`
155			`}`
156
157			`DPRINTK(("lookup successful, inode = %08x\n", (unsigned int)ent->ino));`
158
159			`if (!(res = iget(dir->i_sb,ent->ino))) {`
160			`printk("autofs: iget returned null!\n");`
161			`iput(dir);`
162			`return -EACCES;`
163			`}`
164
165			`if ( !oz_mode && S_ISDIR(res->i_mode) && res->i_sb == dir->i_sb ) {`
166			`/* Not a mount point yet, call 1-800-DAEMON */`
167			`DPRINTK(("autofs: waiting on non-mountpoint dir, inode = %lu, pid = %u, pgrp = %u\n", res->i_ino, current->pid, current->pgrp));`
168			`iput(res);`
169			`res = NULL;`
170			`status = autofs_wait(sbi,hash,name,len);`
171			`if ( status ) {`
172			`iput(dir);`
173			`return status;`
174			`}`
175			`}`
176			`} while(!res);`
177			`autofs_update_usage(&sbi->dirhash,ent);`
178
179			`*result = res;`
180			`iput(dir);`
181			`return 0;`
182			`}`
183
184			`static int autofs_root_symlink(struct inode dir, const char name, int len, const char *symname)`
185			`{`
186			`struct autofs_sb_info sbi = (struct autofs_sb_info ) dir->i_sb->u.generic_sbp;`
187			`struct autofs_dirhash *dh = &sbi->dirhash;`
188			`autofs_hash_t hash = autofs_hash(name,len);`
189			`struct autofs_dir_ent *ent;`
190			`unsigned int n;`
191			`int slsize;`
192			`struct autofs_symlink *sl;`
193
194			`DPRINTK(("autofs_root_symlink: %s <- ", symname));`
195			`autofs_say(name,len);`
196
197			`if ( !autofs_oz_mode(sbi) ) {`
198			`iput(dir);`
199			`return -EPERM;`
200			`}`
201			`if ( len > NAME_MAX)`
202			`return -ENAMETOOLONG;`
203
204			`if ( autofs_hash_lookup(dh,hash,name,len) ) {`
205			`iput(dir);`
206			`return -EEXIST;`
207			`}`
208			`n = find_first_zero_bit(sbi->symlink_bitmap,AUTOFS_MAX_SYMLINKS);`
209			`if ( n >= AUTOFS_MAX_SYMLINKS ) {`
210			`iput(dir);`
211			`return -ENOSPC;`
212			`}`
213			`set_bit(n,sbi->symlink_bitmap);`
214			`sl = &sbi->symlink[n];`
215			`sl->len = strlen(symname);`
216			`sl->data = kmalloc(slsize = sl->len+1, GFP_KERNEL);`
217			`if ( !sl->data ) {`
218			`clear_bit(n,sbi->symlink_bitmap);`
219			`iput(dir);`
220			`return -ENOSPC;`
221			`}`
222			`ent = kmalloc(sizeof(struct autofs_dir_ent), GFP_KERNEL);`
223			`if ( !ent ) {`
224			`kfree(sl->data);`
225			`clear_bit(n,sbi->symlink_bitmap);`
226			`iput(dir);`
227			`return -ENOSPC;`
228			`}`
229			`ent->name = kmalloc(len, GFP_KERNEL);`
230			`if ( !ent->name ) {`
231			`kfree(sl->data);`
232			`kfree(ent);`
233			`clear_bit(n,sbi->symlink_bitmap);`
234			`iput(dir);`
235			`return -ENOSPC;`
236			`}`
237			`memcpy(sl->data,symname,slsize);`
238			`sl->mtime = CURRENT_TIME;`
239
240			`ent->ino = AUTOFS_FIRST_SYMLINK + n;`
241			`ent->hash = hash;`
242			`memcpy(ent->name,name,ent->len = len);`
243
244			`autofs_hash_insert(dh,ent);`
245			`iput(dir);`
246
247			`return 0;`
248			`}`
249
250			`static int autofs_root_unlink(struct inode dir, const char name, int len)`
251			`{`
252			`struct autofs_sb_info sbi = (struct autofs_sb_info ) dir->i_sb->u.generic_sbp;`
253			`struct autofs_dirhash *dh = &sbi->dirhash;`
254			`autofs_hash_t hash = autofs_hash(name,len);`
255			`struct autofs_dir_ent *ent;`
256			`unsigned int n;`
257
258			`iput(dir); /* Nothing below can sleep */`
259
260			`if ( !autofs_oz_mode(sbi) )`
261			`return -EPERM;`
262
263			`if(len > NAME_MAX)`
264			`return -ENAMETOOLONG;`
265
266			`ent = autofs_hash_lookup(dh,hash,name,len);`
267			`if ( !ent )`
268			`return -ENOENT;`
269
270			`n = ent->ino - AUTOFS_FIRST_SYMLINK;`
271			`if ( n >= AUTOFS_MAX_SYMLINKS \|\| !test_bit(n,sbi->symlink_bitmap) )`
272			`return -EINVAL; /* Not a symlink inode, can't unlink */`
273
274			`autofs_hash_delete(ent);`
275			`clear_bit(n,sbi->symlink_bitmap);`
276			`kfree(sbi->symlink[n].data);`
277
278			`return 0;`
279			`}`
280
281			`static int autofs_root_rmdir(struct inode dir, const char name, int len)`
282			`{`
283			`struct autofs_sb_info sbi = (struct autofs_sb_info ) dir->i_sb->u.generic_sbp;`
284			`struct autofs_dirhash *dh = &sbi->dirhash;`
285			`autofs_hash_t hash = autofs_hash(name,len);`
286			`struct autofs_dir_ent *ent;`
287
288			`if ( !autofs_oz_mode(sbi) ) {`
289			`iput(dir);`
290			`return -EPERM;`
291			`}`
292			`ent = autofs_hash_lookup(dh,hash,name,len);`
293			`if ( !ent ) {`
294			`iput(dir);`
295			`return -ENOENT;`
296			`}`
297			`if ( (unsigned int)ent->ino < AUTOFS_FIRST_DIR_INO ) {`
298			`iput(dir);`
299			`return -ENOTDIR; /* Not a directory */`
300			`}`
301			`autofs_hash_delete(ent);`
302			`dir->i_nlink--;`
303			`iput(dir);`
304
305			`return 0;`
306			`}`
307
308			`static int autofs_root_mkdir(struct inode dir, const char name, int len, int mode)`
309			`{`
310			`struct autofs_sb_info sbi = (struct autofs_sb_info ) dir->i_sb->u.generic_sbp;`
311			`struct autofs_dirhash *dh = &sbi->dirhash;`
312			`autofs_hash_t hash = autofs_hash(name,len);`
313			`struct autofs_dir_ent *ent;`
314
315			`if ( !autofs_oz_mode(sbi) ) {`
316			`iput(dir);`
317			`return -EPERM;`
318			`}`
319			`ent = autofs_hash_lookup(dh,hash,name,len);`
320			`if ( ent ) {`
321			`iput(dir);`
322			`return -EEXIST;`
323			`}`
324			`if ( sbi->next_dir_ino < AUTOFS_FIRST_DIR_INO ) {`
325			`printk("autofs: Out of inode numbers -- what the heck did you do??\n");`
326			`iput(dir);`
327			`return -ENOSPC;`
328			`}`
329			`ent = kmalloc(sizeof(struct autofs_dir_ent), GFP_KERNEL);`
330			`if ( !ent ) {`
331			`iput(dir);`
332			`return -ENOSPC;`
333			`}`
334			`ent->name = kmalloc(len, GFP_KERNEL);`
335			`if ( !ent->name ) {`
336			`kfree(ent);`
337			`iput(dir);`
338			`return -ENOSPC;`
339			`}`
340			`ent->hash = hash;`
341			`memcpy(ent->name, name, ent->len = len);`
342			`ent->ino = sbi->next_dir_ino++;`
343			`autofs_hash_insert(dh,ent);`
344			`dir->i_nlink++;`
345			`iput(dir);`
346
347			`return 0;`
348			`}`
349
350			`/* Get/set timeout ioctl() operation */`
351			`static inline int autofs_get_set_timeout(struct autofs_sb_info *sbi,`
352			`unsigned long *p)`
353			`{`
354			`int rv;`
355			`unsigned long ntimeout;`
356
357			`#if LINUX_VERSION_CODE < kver(2,1,0)`
358			`if ( (rv = verify_area(VERIFY_WRITE, p, sizeof(unsigned long))) )`
359			`return rv;`
360			`ntimeout = get_user(p);`
361			`put_user(sbi->exp_timeout/HZ, p);`
362			`#else`
363			`if ( (rv = get_user(ntimeout, p)) \|\|`
364			`(rv = put_user(sbi->exp_timeout/HZ, p)) )`
365			`return rv;`
366			`#endif`
367
368			`if ( ntimeout > ULONG_MAX/HZ )`
369			`sbi->exp_timeout = 0;`
370			`else`
371			`sbi->exp_timeout = ntimeout * HZ;`
372
373			`return 0;`
374			`}`
375
376			`/* Return protocol version */`
377			`static inline int autofs_get_protover(int *p)`
378			`{`
379			`#if LINUX_VERSION_CODE < kver(2,1,0)`
380			`int rv;`
381			`if ( (rv = verify_area(VERIFY_WRITE, p, sizeof(int))) )`
382			`return rv;`
383			`put_user(AUTOFS_PROTO_VERSION, p);`
384			`return 0;`
385			`#else`
386			`return put_user(AUTOFS_PROTO_VERSION, p);`
387			`#endif`
388			`}`
389
390			`/* Perform an expiry operation */`
391			`static inline int autofs_expire_run(struct autofs_sb_info *sbi,`
392			`struct autofs_packet_expire *pkt_p)`
393			`{`
394			`struct autofs_dir_ent *ent;`
395			`struct autofs_packet_expire pkt;`
396			`struct autofs_dirhash *dh = &(sbi->dirhash);`
397
398			`memset(&pkt,0,sizeof pkt);`
399
400			`pkt.hdr.proto_version = AUTOFS_PROTO_VERSION;`
401			`pkt.hdr.type = autofs_ptype_expire;`
402
403			`if ( !sbi->exp_timeout \|\|`
404			`!(ent = autofs_expire(dh,sbi->exp_timeout)) )`
405			`return -EAGAIN;`
406
407			`pkt.len = ent->len;`
408			`memcpy(pkt.name, ent->name, pkt.len);`
409			`pkt.name[pkt.len] = '\0';`
410
411			`if ( copy_to_user(pkt_p, &pkt, sizeof(struct autofs_packet_expire)) )`
412			`return -EFAULT;`
413
414			`autofs_update_usage(dh,ent);`
415
416			`return 0;`
417			`}`
418
419			`/*`
420			`* ioctl()'s on the root directory is the chief method for the daemon to`
421			`* generate kernel reactions`
422			`*/`
423			`static int autofs_root_ioctl(struct inode inode, struct file filp,`
424			`unsigned int cmd, unsigned long arg)`
425			`{`
426			`struct autofs_sb_info *sbi =`
427			`(struct autofs_sb_info *)inode->i_sb->u.generic_sbp;`
428
429			`DPRINTK(("autofs_ioctl: cmd = 0x%08x, arg = 0x%08lx, sbi = %p, pgrp = %u\n",cmd,arg,sbi,current->pgrp));`
430
431			`if ( _IOC_TYPE(cmd) != _IOC_TYPE(AUTOFS_IOC_FIRST) \|\|`
432			`_IOC_NR(cmd) - _IOC_NR(AUTOFS_IOC_FIRST) >= AUTOFS_IOC_COUNT )`
433			`return -ENOTTY;`
434
435			`if ( !autofs_oz_mode(sbi) && !fsuser() )`
436			`return -EPERM;`
437
438			`switch(cmd) {`
439			`case AUTOFS_IOC_READY: /* Wait queue: go ahead and retry */`
440			`return autofs_wait_release(sbi,arg,0);`
441			`case AUTOFS_IOC_FAIL: /* Wait queue: fail with ENOENT */`
442			`return autofs_wait_release(sbi,arg,-ENOENT);`
443			`case AUTOFS_IOC_CATATONIC: /* Enter catatonic mode (daemon shutdown) */`
444			`autofs_catatonic_mode(sbi);`
445			`return 0;`
446			`case AUTOFS_IOC_PROTOVER: /* Get protocol version */`
447			`return autofs_get_protover((int *)arg);`
448			`case AUTOFS_IOC_SETTIMEOUT:`
449			`return autofs_get_set_timeout(sbi,(unsigned long *)arg);`
450			`case AUTOFS_IOC_EXPIRE:`
451			`return autofs_expire_run(sbi,(struct autofs_packet_expire *)arg);`
452			`default:`
453			`return -ENOSYS;`
454			`}`
455			`}`