[linux-2.6-block.git] / fs / coda / inode.c

/*
 * Super block/filesystem wide operations
 *
 * Copyright (C) 1996 Peter J. Braam <braam@maths.ox.ac.uk> and 
 * Michael Callahan <callahan@maths.ox.ac.uk> 
 * 
 * Rewritten for Linux 2.1.  Peter Braam <braam@cs.cmu.edu>
 * Copyright (C) Carnegie Mellon University
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/string.h>
#include <linux/stat.h>
#include <linux/errno.h>
#include <linux/unistd.h>
#include <linux/smp_lock.h>
#include <linux/file.h>
#include <linux/vfs.h>

#include <asm/system.h>
#include <asm/uaccess.h>

#include <linux/fs.h>
#include <linux/vmalloc.h>

#include <linux/coda.h>
#include <linux/coda_linux.h>
#include <linux/coda_psdev.h>
#include <linux/coda_fs_i.h>
#include <linux/coda_cache.h>

#include "coda_int.h"

/* VFS super_block ops */
static void coda_clear_inode(struct inode *);
static void coda_put_super(struct super_block *);
static int coda_statfs(struct dentry *dentry, struct kstatfs *buf);

static kmem_cache_t * coda_inode_cachep;

static struct inode *coda_alloc_inode(struct super_block *sb)
{
	struct coda_inode_info *ei;
	ei = (struct coda_inode_info *)kmem_cache_alloc(coda_inode_cachep, GFP_KERNEL);
	if (!ei)
		return NULL;
	memset(&ei->c_fid, 0, sizeof(struct CodaFid));
	ei->c_flags = 0;
	ei->c_uid = 0;
	ei->c_cached_perm = 0;
	return &ei->vfs_inode;
}

static void coda_destroy_inode(struct inode *inode)
{
	kmem_cache_free(coda_inode_cachep, ITOC(inode));
}

static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
{
	struct coda_inode_info *ei = (struct coda_inode_info *) foo;

	if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
	    SLAB_CTOR_CONSTRUCTOR)
		inode_init_once(&ei->vfs_inode);
}
 
int coda_init_inodecache(void)
{
	coda_inode_cachep = kmem_cache_create("coda_inode_cache",
				sizeof(struct coda_inode_info),
				0, SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,
				init_once, NULL);
	if (coda_inode_cachep == NULL)
		return -ENOMEM;
	return 0;
}

void coda_destroy_inodecache(void)
{
	kmem_cache_destroy(coda_inode_cachep);
}

static int coda_remount(struct super_block *sb, int *flags, char *data)
{
	*flags |= MS_NODIRATIME;
	return 0;
}

/* exported operations */
static struct super_operations coda_super_operations =
{
	.alloc_inode	= coda_alloc_inode,
	.destroy_inode	= coda_destroy_inode,
	.clear_inode	= coda_clear_inode,
	.put_super	= coda_put_super,
	.statfs		= coda_statfs,
	.remount_fs	= coda_remount,
};

static int get_device_index(struct coda_mount_data *data)
{
	struct file *file;
	struct inode *inode;
	int idx;

	if(data == NULL) {
		printk("coda_read_super: Bad mount data\n");
		return -1;
	}

	if(data->version != CODA_MOUNT_VERSION) {
		printk("coda_read_super: Bad mount version\n");
		return -1;
	}

	file = fget(data->fd);
	inode = NULL;
	if(file)
		inode = file->f_dentry->d_inode;
	
	if(!inode || !S_ISCHR(inode->i_mode) ||
	   imajor(inode) != CODA_PSDEV_MAJOR) {
		if(file)
			fput(file);

		printk("coda_read_super: Bad file\n");
		return -1;
	}

	idx = iminor(inode);
	fput(file);

	if(idx < 0 || idx >= MAX_CODADEVS) {
		printk("coda_read_super: Bad minor number\n");
		return -1;
	}

	return idx;
}

static int coda_fill_super(struct super_block *sb, void *data, int silent)
{
        struct inode *root = NULL; 
	struct coda_sb_info *sbi = NULL;
	struct venus_comm *vc = NULL;
	struct CodaFid fid;
        int error;
	int idx;

	idx = get_device_index((struct coda_mount_data *) data);

	/* Ignore errors in data, for backward compatibility */
	if(idx == -1)
		idx = 0;
	
	printk(KERN_INFO "coda_read_super: device index: %i\n", idx);

	vc = &coda_comms[idx];
	if (!vc->vc_inuse) {
		printk("coda_read_super: No pseudo device\n");
		return -EINVAL;
	}

        if ( vc->vc_sb ) {
		printk("coda_read_super: Device already mounted\n");
		return -EBUSY;
	}

	sbi = kmalloc(sizeof(struct coda_sb_info), GFP_KERNEL);
	if(!sbi) {
		return -ENOMEM;
	}

	vc->vc_sb = sb;

	sbi->sbi_vcomm = vc;

        sb->s_fs_info = sbi;
	sb->s_flags |= MS_NODIRATIME; /* probably even noatime */
        sb->s_blocksize = 1024;	/* XXXXX  what do we put here?? */
        sb->s_blocksize_bits = 10;
        sb->s_magic = CODA_SUPER_MAGIC;
        sb->s_op = &coda_super_operations;

	/* get root fid from Venus: this needs the root inode */
	error = venus_rootfid(sb, &fid);
	if ( error ) {
	        printk("coda_read_super: coda_get_rootfid failed with %d\n",
		       error);
		goto error;
	}
	printk("coda_read_super: rootfid is %s\n", coda_f2s(&fid));
	
	/* make root inode */
        error = coda_cnode_make(&root, &fid, sb);
        if ( error || !root ) {
	    printk("Failure of coda_cnode_make for root: error %d\n", error);
	    goto error;
	} 

	printk("coda_read_super: rootinode is %ld dev %s\n", 
	       root->i_ino, root->i_sb->s_id);
	sb->s_root = d_alloc_root(root);
	if (!sb->s_root)
		goto error;
        return 0;

 error:
	if (sbi) {
		kfree(sbi);
		if(vc)
			vc->vc_sb = NULL;		
	}
	if (root)
                iput(root);

        return -EINVAL;
}

static void coda_put_super(struct super_block *sb)
{
        struct coda_sb_info *sbi;

	sbi = coda_sbp(sb);
	sbi->sbi_vcomm->vc_sb = NULL;

	printk("Coda: Bye bye.\n");
	kfree(sbi);
}

static void coda_clear_inode(struct inode *inode)
{
	coda_cache_clear_inode(inode);
}

int coda_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
{
	int err = coda_revalidate_inode(dentry);
	if (!err)
		generic_fillattr(dentry->d_inode, stat);
	return err;
}

int coda_setattr(struct dentry *de, struct iattr *iattr)
{
	struct inode *inode = de->d_inode;
	struct coda_vattr vattr;
	int error;

	lock_kernel();
	
	memset(&vattr, 0, sizeof(vattr)); 

	inode->i_ctime = CURRENT_TIME_SEC;
	coda_iattr_to_vattr(iattr, &vattr);
	vattr.va_type = C_VNON; /* cannot set type */

	/* Venus is responsible for truncating the container-file!!! */
	error = venus_setattr(inode->i_sb, coda_i2f(inode), &vattr);

	if ( !error ) {
	        coda_vattr_to_iattr(inode, &vattr); 
		coda_cache_clear_inode(inode);
	}

	unlock_kernel();

	return error;
}

struct inode_operations coda_file_inode_operations = {
	.permission	= coda_permission,
	.getattr	= coda_getattr,
	.setattr	= coda_setattr,
};

static int coda_statfs(struct dentry *dentry, struct kstatfs *buf)
{
	int error;
	
	lock_kernel();

	error = venus_statfs(dentry, buf);

	unlock_kernel();

	if (error) {
		/* fake something like AFS does */
		buf->f_blocks = 9000000;
		buf->f_bfree  = 9000000;
		buf->f_bavail = 9000000;
		buf->f_files  = 9000000;
		buf->f_ffree  = 9000000;
	}

	/* and fill in the rest */
	buf->f_type = CODA_SUPER_MAGIC;
	buf->f_bsize = 1024;
	buf->f_namelen = CODA_MAXNAMLEN;

	return 0; 
}

/* init_coda: used by filesystems.c to register coda */

static int coda_get_sb(struct file_system_type *fs_type,
	int flags, const char *dev_name, void *data, struct vfsmount *mnt)
{
	return get_sb_nodev(fs_type, flags, data, coda_fill_super, mnt);
}

struct file_system_type coda_fs_type = {
	.owner		= THIS_MODULE,
	.name		= "coda",
	.get_sb		= coda_get_sb,
	.kill_sb	= kill_anon_super,
	.fs_flags	= FS_BINARY_MOUNTDATA,
};
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Super block/filesystem wide operations
	3	*
	4	* Copyright (C) 1996 Peter J. Braam <braam@maths.ox.ac.uk> and
	5	* Michael Callahan <callahan@maths.ox.ac.uk>
	6	*
	7	* Rewritten for Linux 2.1. Peter Braam <braam@cs.cmu.edu>
	8	* Copyright (C) Carnegie Mellon University
	9	*/
	10
	11	#include <linux/module.h>
	12	#include <linux/kernel.h>
	13	#include <linux/mm.h>
	14	#include <linux/string.h>
	15	#include <linux/stat.h>
	16	#include <linux/errno.h>
	17	#include <linux/unistd.h>
	18	#include <linux/smp_lock.h>
	19	#include <linux/file.h>
	20	#include <linux/vfs.h>
	21
	22	#include <asm/system.h>
	23	#include <asm/uaccess.h>
	24
	25	#include <linux/fs.h>
	26	#include <linux/vmalloc.h>
	27
	28	#include <linux/coda.h>
	29	#include <linux/coda_linux.h>
	30	#include <linux/coda_psdev.h>
	31	#include <linux/coda_fs_i.h>
	32	#include <linux/coda_cache.h>
	33
c98d8cfb AB	34	#include "coda_int.h"
c98d8cfb AB	35
1da177e4 LT	36	/* VFS super_block ops */
	37	static void coda_clear_inode(struct inode *);
	38	static void coda_put_super(struct super_block *);
726c3342	39	static int coda_statfs(struct dentry dentry, struct kstatfs buf);
1da177e4 LT	40
	41	static kmem_cache_t * coda_inode_cachep;
	42
	43	static struct inode coda_alloc_inode(struct super_block sb)
	44	{
	45	struct coda_inode_info *ei;
e94b1766	46	ei = (struct coda_inode_info *)kmem_cache_alloc(coda_inode_cachep, GFP_KERNEL);
1da177e4 LT	47	if (!ei)
	48	return NULL;
	49	memset(&ei->c_fid, 0, sizeof(struct CodaFid));
	50	ei->c_flags = 0;
	51	ei->c_uid = 0;
	52	ei->c_cached_perm = 0;
	53	return &ei->vfs_inode;
	54	}
	55
	56	static void coda_destroy_inode(struct inode *inode)
	57	{
	58	kmem_cache_free(coda_inode_cachep, ITOC(inode));
	59	}
	60
	61	static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
	62	{
	63	struct coda_inode_info ei = (struct coda_inode_info ) foo;
	64
	65	if ((flags & (SLAB_CTOR_VERIFY\|SLAB_CTOR_CONSTRUCTOR)) ==
	66	SLAB_CTOR_CONSTRUCTOR)
	67	inode_init_once(&ei->vfs_inode);
	68	}
	69
	70	int coda_init_inodecache(void)
	71	{
	72	coda_inode_cachep = kmem_cache_create("coda_inode_cache",
	73	sizeof(struct coda_inode_info),
4b6a9316	74	0, SLAB_RECLAIM_ACCOUNT\|SLAB_MEM_SPREAD,
1da177e4 LT	75	init_once, NULL);
	76	if (coda_inode_cachep == NULL)
	77	return -ENOMEM;
	78	return 0;
	79	}
	80
	81	void coda_destroy_inodecache(void)
	82	{
1a1d92c1	83	kmem_cache_destroy(coda_inode_cachep);
1da177e4 LT	84	}
	85
	86	static int coda_remount(struct super_block sb, int flags, char *data)
	87	{
	88	*flags \|= MS_NODIRATIME;
	89	return 0;
	90	}
	91
	92	/* exported operations */
	93	static struct super_operations coda_super_operations =
	94	{
	95	.alloc_inode = coda_alloc_inode,
	96	.destroy_inode = coda_destroy_inode,
	97	.clear_inode = coda_clear_inode,
	98	.put_super = coda_put_super,
	99	.statfs = coda_statfs,
	100	.remount_fs = coda_remount,
	101	};
	102
	103	static int get_device_index(struct coda_mount_data *data)
	104	{
	105	struct file *file;
	106	struct inode *inode;
	107	int idx;
	108
	109	if(data == NULL) {
	110	printk("coda_read_super: Bad mount data\n");
	111	return -1;
	112	}
	113
	114	if(data->version != CODA_MOUNT_VERSION) {
	115	printk("coda_read_super: Bad mount version\n");
	116	return -1;
	117	}
	118
	119	file = fget(data->fd);
	120	inode = NULL;
	121	if(file)
	122	inode = file->f_dentry->d_inode;
	123
	124	if(!inode \|\| !S_ISCHR(inode->i_mode) \|\|
	125	imajor(inode) != CODA_PSDEV_MAJOR) {
	126	if(file)
	127	fput(file);
	128
	129	printk("coda_read_super: Bad file\n");
	130	return -1;
	131	}
	132
	133	idx = iminor(inode);
	134	fput(file);
	135
	136	if(idx < 0 \|\| idx >= MAX_CODADEVS) {
	137	printk("coda_read_super: Bad minor number\n");
	138	return -1;
	139	}
	140
	141	return idx;
	142	}
	143
	144	static int coda_fill_super(struct super_block sb, void data, int silent)
	145	{
	146	struct inode *root = NULL;
	147	struct coda_sb_info *sbi = NULL;
148	struct venus_comm *vc = NULL;
149	struct CodaFid fid;
150	int error;
151	int idx;
152
153	idx = get_device_index((struct coda_mount_data *) data);
154
155	/* Ignore errors in data, for backward compatibility */
156	if(idx == -1)
157	idx = 0;
158
159	printk(KERN_INFO "coda_read_super: device index: %i\n", idx);
160
161	vc = &coda_comms[idx];
162	if (!vc->vc_inuse) {
163	printk("coda_read_super: No pseudo device\n");
164	return -EINVAL;
165	}
166
167	if ( vc->vc_sb ) {
168	printk("coda_read_super: Device already mounted\n");
169	return -EBUSY;
170	}
171
172	sbi = kmalloc(sizeof(struct coda_sb_info), GFP_KERNEL);
173	if(!sbi) {
174	return -ENOMEM;
175	}
176
177	vc->vc_sb = sb;
178
179	sbi->sbi_vcomm = vc;
180
181	sb->s_fs_info = sbi;
182	sb->s_flags \|= MS_NODIRATIME; /* probably even noatime */
183	sb->s_blocksize = 1024; /* XXXXX what do we put here?? */
184	sb->s_blocksize_bits = 10;
185	sb->s_magic = CODA_SUPER_MAGIC;
186	sb->s_op = &coda_super_operations;
187
188	/* get root fid from Venus: this needs the root inode */
189	error = venus_rootfid(sb, &fid);
190	if ( error ) {
191	printk("coda_read_super: coda_get_rootfid failed with %d\n",
192	error);
193	goto error;
194	}
195	printk("coda_read_super: rootfid is %s\n", coda_f2s(&fid));
196
197	/* make root inode */
198	error = coda_cnode_make(&root, &fid, sb);
199	if ( error \|\| !root ) {
200	printk("Failure of coda_cnode_make for root: error %d\n", error);
201	goto error;
202	}
203
204	printk("coda_read_super: rootinode is %ld dev %s\n",
205	root->i_ino, root->i_sb->s_id);
206	sb->s_root = d_alloc_root(root);
207	if (!sb->s_root)
208	goto error;
209	return 0;
210
211	error:
212	if (sbi) {
213	kfree(sbi);
214	if(vc)
215	vc->vc_sb = NULL;
216	}
217	if (root)
218	iput(root);
219
220	return -EINVAL;
221	}
222
223	static void coda_put_super(struct super_block *sb)
224	{
225	struct coda_sb_info *sbi;
226
227	sbi = coda_sbp(sb);
228	sbi->sbi_vcomm->vc_sb = NULL;
229
230	printk("Coda: Bye bye.\n");
231	kfree(sbi);
232	}
233
234	static void coda_clear_inode(struct inode *inode)
235	{
236	coda_cache_clear_inode(inode);
237	}
238
239	int coda_getattr(struct vfsmount mnt, struct dentry dentry, struct kstat *stat)
240	{
241	int err = coda_revalidate_inode(dentry);
242	if (!err)
243	generic_fillattr(dentry->d_inode, stat);
244	return err;
245	}
246
247	int coda_setattr(struct dentry de, struct iattr iattr)
248	{
249	struct inode *inode = de->d_inode;
250	struct coda_vattr vattr;
251	int error;
252
253	lock_kernel();
254
255	memset(&vattr, 0, sizeof(vattr));
256
257	inode->i_ctime = CURRENT_TIME_SEC;
258	coda_iattr_to_vattr(iattr, &vattr);
259	vattr.va_type = C_VNON; /* cannot set type */
260
261	/* Venus is responsible for truncating the container-file!!! */
262	error = venus_setattr(inode->i_sb, coda_i2f(inode), &vattr);
263
264	if ( !error ) {
265	coda_vattr_to_iattr(inode, &vattr);
266	coda_cache_clear_inode(inode);
267	}
268
269	unlock_kernel();
270
271	return error;
272	}
273
274	struct inode_operations coda_file_inode_operations = {
275	.permission = coda_permission,
276	.getattr = coda_getattr,
277	.setattr = coda_setattr,
278	};
279
726c3342	280	static int coda_statfs(struct dentry dentry, struct kstatfs buf)
1da177e4 LT	281	{
	282	int error;
	283
	284	lock_kernel();
	285
726c3342	286	error = venus_statfs(dentry, buf);
1da177e4 LT	287
	288	unlock_kernel();
	289
	290	if (error) {
	291	/* fake something like AFS does */
	292	buf->f_blocks = 9000000;
	293	buf->f_bfree = 9000000;
	294	buf->f_bavail = 9000000;
	295	buf->f_files = 9000000;
	296	buf->f_ffree = 9000000;
	297	}
	298
	299	/* and fill in the rest */
	300	buf->f_type = CODA_SUPER_MAGIC;
	301	buf->f_bsize = 1024;
	302	buf->f_namelen = CODA_MAXNAMLEN;
	303
	304	return 0;
	305	}
	306
	307	/* init_coda: used by filesystems.c to register coda */
	308
454e2398 DH	309	static int coda_get_sb(struct file_system_type *fs_type,
454e2398 DH	310	int flags, const char dev_name, void data, struct vfsmount *mnt)
1da177e4	311	{
454e2398	312	return get_sb_nodev(fs_type, flags, data, coda_fill_super, mnt);
1da177e4 LT	313	}
	314
	315	struct file_system_type coda_fs_type = {
	316	.owner = THIS_MODULE,
	317	.name = "coda",
	318	.get_sb = coda_get_sb,
	319	.kill_sb = kill_anon_super,
	320	.fs_flags = FS_BINARY_MOUNTDATA,
	321	};
	322