[linux.git] / fs / coda / inode.c

/*
 * Super block/filesystem wide operations
 *
 * Copyright (C) 1996 Peter J. Braam <[email protected]> and 
 * Michael Callahan <[email protected]> 
 * 
 * Rewritten for Linux 2.1.  Peter Braam <[email protected]>
 * 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/mutex.h>
#include <linux/spinlock.h>
#include <linux/file.h>
#include <linux/vfs.h>
#include <linux/slab.h>

#include <asm/uaccess.h>

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

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

#include "coda_int.h"

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

static struct kmem_cache * coda_inode_cachep;

static struct inode *coda_alloc_inode(struct super_block *sb)
{
	struct coda_inode_info *ei;
	ei = 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;
	spin_lock_init(&ei->c_lock);
	return &ei->vfs_inode;
}

static void coda_i_callback(struct rcu_head *head)
{
	struct inode *inode = container_of(head, struct inode, i_rcu);
	kmem_cache_free(coda_inode_cachep, ITOC(inode));
}

static void coda_destroy_inode(struct inode *inode)
{
	call_rcu(&inode->i_rcu, coda_i_callback);
}

static void init_once(void *foo)
{
	struct coda_inode_info *ei = (struct coda_inode_info *) foo;

	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);
	if (coda_inode_cachep == NULL)
		return -ENOMEM;
	return 0;
}

void coda_destroy_inodecache(void)
{
	/*
	 * Make sure all delayed rcu free inodes are flushed before we
	 * destroy cache.
	 */
	rcu_barrier();
	kmem_cache_destroy(coda_inode_cachep);
}

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

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

static int get_device_index(struct coda_mount_data *data)
{
	struct fd f;
	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;
	}

	f = fdget(data->fd);
	if (!f.file)
		goto Ebadf;
	inode = f.file->f_path.dentry->d_inode;
	if (!S_ISCHR(inode->i_mode) || imajor(inode) != CODA_PSDEV_MAJOR) {
		fdput(f);
		goto Ebadf;
	}

	idx = iminor(inode);
	fdput(f);

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

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

static int coda_fill_super(struct super_block *sb, void *data, int silent)
{
	struct inode *root = NULL;
	struct venus_comm *vc;
	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];
	mutex_lock(&vc->vc_mutex);

	if (!vc->vc_inuse) {
		printk("coda_read_super: No pseudo device\n");
		error = -EINVAL;
		goto unlock_out;
	}

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

	error = bdi_setup_and_register(&vc->bdi, "coda", BDI_CAP_MAP_COPY);
	if (error)
		goto unlock_out;

	vc->vc_sb = sb;
	mutex_unlock(&vc->vc_mutex);

	sb->s_fs_info = vc;
	sb->s_flags |= MS_NOATIME;
	sb->s_blocksize = 4096;	/* XXXXX  what do we put here?? */
	sb->s_blocksize_bits = 12;
	sb->s_magic = CODA_SUPER_MAGIC;
	sb->s_op = &coda_super_operations;
	sb->s_d_op = &coda_dentry_operations;
	sb->s_bdi = &vc->bdi;

	/* 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 */
        root = coda_cnode_make(&fid, sb);
        if (IS_ERR(root)) {
		error = PTR_ERR(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_make_root(root);
	if (!sb->s_root) {
		error = -EINVAL;
		goto error;
	}
	return 0;

error:
	mutex_lock(&vc->vc_mutex);
	bdi_destroy(&vc->bdi);
	vc->vc_sb = NULL;
	sb->s_fs_info = NULL;
unlock_out:
	mutex_unlock(&vc->vc_mutex);
	return error;
}

static void coda_put_super(struct super_block *sb)
{
	struct venus_comm *vcp = coda_vcp(sb);
	mutex_lock(&vcp->vc_mutex);
	bdi_destroy(&vcp->bdi);
	vcp->vc_sb = NULL;
	sb->s_fs_info = NULL;
	mutex_unlock(&vcp->vc_mutex);

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

static void coda_evict_inode(struct inode *inode)
{
	truncate_inode_pages(&inode->i_data, 0);
	clear_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;

	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);
	}
	return error;
}

const 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;
	
	error = venus_statfs(dentry, buf);

	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 = 4096;
	buf->f_namelen = CODA_MAXNAMLEN;

	return 0; 
}

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

static struct dentry *coda_mount(struct file_system_type *fs_type,
	int flags, const char *dev_name, void *data)
{
	return mount_nodev(fs_type, flags, data, coda_fill_super);
}

struct file_system_type coda_fs_type = {
	.owner		= THIS_MODULE,
	.name		= "coda",
	.mount		= coda_mount,
	.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 <[email protected]> and
	5	* Michael Callahan <[email protected]>
	6	*
	7	* Rewritten for Linux 2.1. Peter Braam <[email protected]>
	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>
da47c19e	18	#include <linux/mutex.h>
b5ce1d83	19	#include <linux/spinlock.h>
1da177e4 LT	20	#include <linux/file.h>
1da177e4 LT	21	#include <linux/vfs.h>
5a0e3ad6	22	#include <linux/slab.h>
1da177e4	23
1da177e4 LT	24	#include <asm/uaccess.h>
	25
	26	#include <linux/fs.h>
	27	#include <linux/vmalloc.h>
	28
	29	#include <linux/coda.h>
1da177e4	30	#include <linux/coda_psdev.h>
31a203df AV	31	#include "coda_linux.h"
31a203df AV	32	#include "coda_cache.h"
1da177e4	33
c98d8cfb AB	34	#include "coda_int.h"
c98d8cfb AB	35
1da177e4	36	/* VFS super_block ops */
b57922d9	37	static void coda_evict_inode(struct inode *);
1da177e4	38	static void coda_put_super(struct super_block *);
726c3342	39	static int coda_statfs(struct dentry dentry, struct kstatfs buf);
1da177e4	40
e18b890b	41	static struct kmem_cache * coda_inode_cachep;
1da177e4 LT	42
	43	static struct inode coda_alloc_inode(struct super_block sb)
	44	{
	45	struct coda_inode_info *ei;
747fecab	46	ei = 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;
b5ce1d83	53	spin_lock_init(&ei->c_lock);
1da177e4 LT	54	return &ei->vfs_inode;
	55	}
	56
fa0d7e3d	57	static void coda_i_callback(struct rcu_head *head)
1da177e4	58	{
fa0d7e3d	59	struct inode *inode = container_of(head, struct inode, i_rcu);
1da177e4 LT	60	kmem_cache_free(coda_inode_cachep, ITOC(inode));
	61	}
	62
fa0d7e3d NP	63	static void coda_destroy_inode(struct inode *inode)
	64	{
	65	call_rcu(&inode->i_rcu, coda_i_callback);
	66	}
	67
51cc5068	68	static void init_once(void *foo)
1da177e4 LT	69	{
	70	struct coda_inode_info ei = (struct coda_inode_info ) foo;
	71
a35afb83	72	inode_init_once(&ei->vfs_inode);
1da177e4	73	}
20c2df83	74
1da177e4 LT	75	int coda_init_inodecache(void)
	76	{
	77	coda_inode_cachep = kmem_cache_create("coda_inode_cache",
	78	sizeof(struct coda_inode_info),
4b6a9316	79	0, SLAB_RECLAIM_ACCOUNT\|SLAB_MEM_SPREAD,
20c2df83	80	init_once);
1da177e4 LT	81	if (coda_inode_cachep == NULL)
	82	return -ENOMEM;
	83	return 0;
	84	}
	85
	86	void coda_destroy_inodecache(void)
	87	{
8c0a8537 KS	88	/*
	89	* Make sure all delayed rcu free inodes are flushed before we
	90	* destroy cache.
	91	*/
	92	rcu_barrier();
1a1d92c1	93	kmem_cache_destroy(coda_inode_cachep);
1da177e4 LT	94	}
	95
	96	static int coda_remount(struct super_block sb, int flags, char *data)
	97	{
fac1f0e3	98	*flags \|= MS_NOATIME;
1da177e4 LT	99	return 0;
	100	}
	101
	102	/* exported operations */
ee9b6d61	103	static const struct super_operations coda_super_operations =
1da177e4 LT	104	{
	105	.alloc_inode = coda_alloc_inode,
	106	.destroy_inode = coda_destroy_inode,
b57922d9	107	.evict_inode = coda_evict_inode,
1da177e4 LT	108	.put_super = coda_put_super,
	109	.statfs = coda_statfs,
	110	.remount_fs = coda_remount,
	111	};
	112
	113	static int get_device_index(struct coda_mount_data *data)
	114	{
2903ff01	115	struct fd f;
1da177e4	116	struct inode *inode;
2903ff01	117	int idx;
1da177e4	118
78f7d75e	119	if (data == NULL) {
1da177e4 LT	120	printk("coda_read_super: Bad mount data\n");
	121	return -1;
	122	}
	123
78f7d75e	124	if (data->version != CODA_MOUNT_VERSION) {
1da177e4 LT	125	printk("coda_read_super: Bad mount version\n");
	126	return -1;
	127	}
	128
2903ff01 AV	129	f = fdget(data->fd);
2903ff01 AV	130	if (!f.file)
78f7d75e	131	goto Ebadf;
2903ff01	132	inode = f.file->f_path.dentry->d_inode;
78f7d75e	133	if (!S_ISCHR(inode->i_mode) \|\| imajor(inode) != CODA_PSDEV_MAJOR) {
2903ff01	134	fdput(f);
78f7d75e	135	goto Ebadf;
1da177e4 LT	136	}
	137
	138	idx = iminor(inode);
2903ff01	139	fdput(f);
1da177e4	140
78f7d75e	141	if (idx < 0 \|\| idx >= MAX_CODADEVS) {
1da177e4 LT	142	printk("coda_read_super: Bad minor number\n");
	143	return -1;
	144	}
	145
	146	return idx;
78f7d75e AV	147	Ebadf:
	148	printk("coda_read_super: Bad file\n");
	149	return -1;
1da177e4 LT	150	}
	151
	152	static int coda_fill_super(struct super_block sb, void data, int silent)
	153	{
a1b0aa87	154	struct inode *root = NULL;
da47c19e	155	struct venus_comm *vc;
1da177e4	156	struct CodaFid fid;
a1b0aa87	157	int error;
1da177e4 LT	158	int idx;
	159
	160	idx = get_device_index((struct coda_mount_data *) data);
	161
	162	/* Ignore errors in data, for backward compatibility */
	163	if(idx == -1)
	164	idx = 0;
	165
	166	printk(KERN_INFO "coda_read_super: device index: %i\n", idx);
	167
	168	vc = &coda_comms[idx];
da47c19e	169	mutex_lock(&vc->vc_mutex);
f7cc02b8	170
1da177e4 LT	171	if (!vc->vc_inuse) {
1da177e4 LT	172	printk("coda_read_super: No pseudo device\n");
f7cc02b8 YA	173	error = -EINVAL;
f7cc02b8 YA	174	goto unlock_out;
1da177e4 LT	175	}
1da177e4 LT	176
f7cc02b8	177	if (vc->vc_sb) {
1da177e4	178	printk("coda_read_super: Device already mounted\n");
f7cc02b8 YA	179	error = -EBUSY;
f7cc02b8 YA	180	goto unlock_out;
1da177e4 LT	181	}
1da177e4 LT	182
5163d900 JA	183	error = bdi_setup_and_register(&vc->bdi, "coda", BDI_CAP_MAP_COPY);
5163d900 JA	184	if (error)
f7cc02b8	185	goto unlock_out;
5163d900	186
1da177e4	187	vc->vc_sb = sb;
da47c19e	188	mutex_unlock(&vc->vc_mutex);
1da177e4	189
a1b0aa87	190	sb->s_fs_info = vc;
fac1f0e3 JH	191	sb->s_flags \|= MS_NOATIME;
	192	sb->s_blocksize = 4096; /* XXXXX what do we put here?? */
	193	sb->s_blocksize_bits = 12;
	194	sb->s_magic = CODA_SUPER_MAGIC;
	195	sb->s_op = &coda_super_operations;
9501e4c4	196	sb->s_d_op = &coda_dentry_operations;
5163d900	197	sb->s_bdi = &vc->bdi;
1da177e4 LT	198
	199	/* get root fid from Venus: this needs the root inode */
	200	error = venus_rootfid(sb, &fid);
	201	if ( error ) {
	202	printk("coda_read_super: coda_get_rootfid failed with %d\n",
	203	error);
	204	goto error;
	205	}
	206	printk("coda_read_super: rootfid is %s\n", coda_f2s(&fid));
	207
	208	/* make root inode */
f4947fbc AV	209	root = coda_cnode_make(&fid, sb);
	210	if (IS_ERR(root)) {
	211	error = PTR_ERR(root);
	212	printk("Failure of coda_cnode_make for root: error %d\n", error);
f4947fbc	213	goto error;
1da177e4 LT	214	}
	215
	216	printk("coda_read_super: rootinode is %ld dev %s\n",
	217	root->i_ino, root->i_sb->s_id);
48fde701	218	sb->s_root = d_make_root(root);
f7cc02b8 YA	219	if (!sb->s_root) {
f7cc02b8 YA	220	error = -EINVAL;
1da177e4	221	goto error;
f7cc02b8	222	}
db719222	223	return 0;
1da177e4	224
f7cc02b8	225	error:
da47c19e	226	mutex_lock(&vc->vc_mutex);
f7cc02b8 YA	227	bdi_destroy(&vc->bdi);
	228	vc->vc_sb = NULL;
	229	sb->s_fs_info = NULL;
	230	unlock_out:
da47c19e	231	mutex_unlock(&vc->vc_mutex);
f7cc02b8	232	return error;
1da177e4 LT	233	}
	234
	235	static void coda_put_super(struct super_block *sb)
	236	{
da47c19e YA	237	struct venus_comm *vcp = coda_vcp(sb);
	238	mutex_lock(&vcp->vc_mutex);
	239	bdi_destroy(&vcp->bdi);
	240	vcp->vc_sb = NULL;
a1b0aa87	241	sb->s_fs_info = NULL;
da47c19e	242	mutex_unlock(&vcp->vc_mutex);
1da177e4 LT	243
1da177e4 LT	244	printk("Coda: Bye bye.\n");
1da177e4 LT	245	}
1da177e4 LT	246
b57922d9	247	static void coda_evict_inode(struct inode *inode)
1da177e4	248	{
b57922d9	249	truncate_inode_pages(&inode->i_data, 0);
dbd5768f	250	clear_inode(inode);
1da177e4 LT	251	coda_cache_clear_inode(inode);
	252	}
	253
	254	int coda_getattr(struct vfsmount mnt, struct dentry dentry, struct kstat *stat)
	255	{
	256	int err = coda_revalidate_inode(dentry);
	257	if (!err)
	258	generic_fillattr(dentry->d_inode, stat);
	259	return err;
	260	}
	261
	262	int coda_setattr(struct dentry de, struct iattr iattr)
	263	{
	264	struct inode *inode = de->d_inode;
	265	struct coda_vattr vattr;
	266	int error;
	267
1da177e4 LT	268	memset(&vattr, 0, sizeof(vattr));
	269
	270	inode->i_ctime = CURRENT_TIME_SEC;
	271	coda_iattr_to_vattr(iattr, &vattr);
	272	vattr.va_type = C_VNON; /* cannot set type */
	273
	274	/* Venus is responsible for truncating the container-file!!! */
	275	error = venus_setattr(inode->i_sb, coda_i2f(inode), &vattr);
	276
f7cc02b8	277	if (!error) {
1da177e4 LT	278	coda_vattr_to_iattr(inode, &vattr);
	279	coda_cache_clear_inode(inode);
	280	}
1da177e4 LT	281	return error;
	282	}
	283
754661f1	284	const struct inode_operations coda_file_inode_operations = {
1da177e4 LT	285	.permission = coda_permission,
	286	.getattr = coda_getattr,
	287	.setattr = coda_setattr,
	288	};
	289
726c3342	290	static int coda_statfs(struct dentry dentry, struct kstatfs buf)
1da177e4 LT	291	{
	292	int error;
	293
726c3342	294	error = venus_statfs(dentry, buf);
1da177e4	295
1da177e4 LT	296	if (error) {
	297	/* fake something like AFS does */
	298	buf->f_blocks = 9000000;
	299	buf->f_bfree = 9000000;
	300	buf->f_bavail = 9000000;
	301	buf->f_files = 9000000;
	302	buf->f_ffree = 9000000;
	303	}
	304
	305	/* and fill in the rest */
	306	buf->f_type = CODA_SUPER_MAGIC;
fac1f0e3	307	buf->f_bsize = 4096;
1da177e4 LT	308	buf->f_namelen = CODA_MAXNAMLEN;
	309
	310	return 0;
	311	}
	312
	313	/* init_coda: used by filesystems.c to register coda */
	314
3c26ff6e AV	315	static struct dentry coda_mount(struct file_system_type fs_type,
3c26ff6e AV	316	int flags, const char dev_name, void data)
1da177e4	317	{
3c26ff6e	318	return mount_nodev(fs_type, flags, data, coda_fill_super);
1da177e4 LT	319	}
	320
	321	struct file_system_type coda_fs_type = {
	322	.owner = THIS_MODULE,
	323	.name = "coda",
3c26ff6e	324	.mount = coda_mount,
1da177e4 LT	325	.kill_sb = kill_anon_super,
	326	.fs_flags = FS_BINARY_MOUNTDATA,
	327	};
	328