Release 4.17 fs/coda/inode.c

// SPDX-License-Identifier: GPL-2.0
/*
 * 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/mutex.h>
#include <linux/spinlock.h>
#include <linux/file.h>
#include <linux/vfs.h>
#include <linux/slab.h>
#include <linux/pid_namespace.h>
#include <linux/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 = GLOBAL_ROOT_UID;
	ei->c_cached_perm = 0;
	spin_lock_init(&ei->c_lock);
	return &ei->vfs_inode;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds
70
84.34%
2
28.57%
Yoshihisa Abe
8
9.64%
1
14.29%
Jan Harkes
3
3.61%
2
28.57%
Christoph Lameter
1
1.20%
1
14.29%
Eric W. Biedermann
1
1.20%
1
14.29%
Total
83
100.00%
7
100.00%



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));
}

Contributors
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Tokens
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CommitProp
Nicholas Piggin
18
50.00%
1
50.00%
Linus Torvalds
18
50.00%
1
50.00%
Total
36
100.00%
2
100.00%



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

Contributors
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Nicholas Piggin
21
100.00%
1
100.00%
Total
21
100.00%
1
100.00%



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

	inode_init_once(&ei->vfs_inode);
}

Contributors
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Tokens
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CommitProp
Linus Torvalds
27
90.00%
1
50.00%
Christoph Lameter
3
10.00%
1
50.00%
Total
30
100.00%
2
100.00%



int __init 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|
				SLAB_ACCOUNT, init_once);
	if (coda_inode_cachep == NULL)
		return -ENOMEM;
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds
38
86.36%
1
20.00%
Vladimir Davydov
2
4.55%
1
20.00%
Paul Jackson
2
4.55%
1
20.00%
Andrew Morton
1
2.27%
1
20.00%
Fabian Frederick
1
2.27%
1
20.00%
Total
44
100.00%
5
100.00%



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);
}

Contributors
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Tokens
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CommitProp
Linus Torvalds
12
75.00%
1
50.00%
Kirill A. Shutemov
4
25.00%
1
50.00%
Total
16
100.00%
2
100.00%



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

Contributors
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CommitProp
Al Viro
26
81.25%
1
33.33%
Theodore Y. Ts'o
5
15.62%
1
33.33%
Linus Torvalds
1
3.12%
1
33.33%
Total
32
100.00%
3
100.00%

/* 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) {
		pr_warn("%s: Bad mount data\n", __func__);
		return -1;
	}

	if (data->version != CODA_MOUNT_VERSION) {
		pr_warn("%s: Bad mount version\n", __func__);
		return -1;
	}

	f = fdget(data->fd);
	if (!f.file)
		goto Ebadf;
	inode = file_inode(f.file);
	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) {
		pr_warn("%s: Bad minor number\n", __func__);
		return -1;
	}

	return idx;
Ebadf:
	pr_warn("%s: Bad file\n", __func__);
	return -1;
}

Contributors
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CommitProp
Linus Torvalds (pre-git)
120
71.01%
1
12.50%
Al Viro
33
19.53%
5
62.50%
Fabian Frederick
16
9.47%
2
25.00%
Total
169
100.00%
8
100.00%



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;

	if (task_active_pid_ns(current) != &init_pid_ns)
		return -EINVAL;

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

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

	vc = &coda_comms[idx];
	mutex_lock(&vc->vc_mutex);

	if (!vc->vc_inuse) {
		pr_warn("%s: No pseudo device\n", __func__);
		error = -EINVAL;
		goto unlock_out;
	}

	if (vc->vc_sb) {
		pr_warn("%s: Device already mounted\n", __func__);
		error = -EBUSY;
		goto unlock_out;
	}

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

	sb->s_fs_info = vc;
	sb->s_flags |= SB_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;

	error = super_setup_bdi(sb);
	if (error)
		goto error;

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

	pr_info("%s: rootinode is %ld dev %s\n",
		__func__, 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);
	vc->vc_sb = NULL;
	sb->s_fs_info = NULL;
unlock_out:
	mutex_unlock(&vc->vc_mutex);
	return error;
}

Contributors
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Linus Torvalds (pre-git)
217
56.66%
4
15.38%
Yoshihisa Abe
59
15.40%
2
7.69%
Al Viro
38
9.92%
7
26.92%
Fabian Frederick
25
6.53%
2
7.69%
Eric W. Biedermann
14
3.66%
1
3.85%
Jan Kara
12
3.13%
1
3.85%
Andrew Morton
5
1.31%
1
3.85%
Jan Harkes
5
1.31%
3
11.54%
Jens Axboe
4
1.04%
1
3.85%
Linus Torvalds
2
0.52%
2
7.69%
Brian Gerst
1
0.26%
1
3.85%
Jan Blunck
1
0.26%
1
3.85%
Total
383
100.00%
26
100.00%



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

	pr_info("Bye bye.\n");
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Yoshihisa Abe
20
37.04%
1
12.50%
Linus Torvalds (pre-git)
19
35.19%
3
37.50%
Jens Axboe
7
12.96%
1
12.50%
Jan Harkes
6
11.11%
1
12.50%
Fabian Frederick
2
3.70%
2
25.00%
Total
54
100.00%
8
100.00%



static void coda_evict_inode(struct inode *inode)
{
	truncate_inode_pages_final(&inode->i_data);
	clear_inode(inode);
	coda_cache_clear_inode(inode);
}

Contributors
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Tokens
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Commits
CommitProp
Linus Torvalds (pre-git)
15
51.72%
2
40.00%
Al Viro
12
41.38%
1
20.00%
Johannes Weiner
1
3.45%
1
20.00%
Jan Kara
1
3.45%
1
20.00%
Total
29
100.00%
5
100.00%



int coda_getattr(const struct path *path, struct kstat *stat,
		 u32 request_mask, unsigned int flags)
{
	int err = coda_revalidate_inode(d_inode(path->dentry));
	if (!err)
		generic_fillattr(d_inode(path->dentry), stat);
	return err;
}

Contributors
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Tokens
Prop
Commits
CommitProp
Al Viro
35
62.50%
2
40.00%
David Howells
20
35.71%
2
40.00%
Linus Torvalds (pre-git)
1
1.79%
1
20.00%
Total
56
100.00%
5
100.00%



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

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

	inode->i_ctime = current_time(inode);
	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;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
96
87.27%
6
60.00%
Jan Harkes
5
4.55%
1
10.00%
Deepa Dinamani
4
3.64%
1
10.00%
David Howells
3
2.73%
1
10.00%
Al Viro
2
1.82%
1
10.00%
Total
110
100.00%
10
100.00%


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; 
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
82
94.25%
3
50.00%
David Howells
3
3.45%
1
16.67%
Jan Harkes
1
1.15%
1
16.67%
Andrew Morton
1
1.15%
1
16.67%
Total
87
100.00%
6
100.00%

/* 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);
}

Contributors
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Al Viro
31
83.78%
2
50.00%
Linus Torvalds (pre-git)
5
13.51%
1
25.00%
Andries E. Brouwer
1
2.70%
1
25.00%
Total
37
100.00%
4
100.00%


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,
};
MODULE_ALIAS_FS("coda");

Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
657
47.27%
12
14.63%
Al Viro
208
14.96%
19
23.17%
Linus Torvalds
178
12.81%
4
4.88%
Yoshihisa Abe
91
6.55%
3
3.66%
Fabian Frederick
45
3.24%
5
6.10%
Jan Harkes
45
3.24%
7
8.54%
Nicholas Piggin
39
2.81%
1
1.22%
David Howells
28
2.01%
3
3.66%
Eric W. Biedermann
23
1.65%
3
3.66%
Jan Kara
13
0.94%
2
2.44%
Andrew Morton
13
0.94%
4
4.88%
Jens Axboe
11
0.79%
1
1.22%
Christoph Lameter
6
0.43%
3
3.66%
Theodore Y. Ts'o
5
0.36%
1
1.22%
Kirill A. Shutemov
4
0.29%
1
1.22%
Deepa Dinamani
4
0.29%
1
1.22%
Christoph Hellwig
3
0.22%
1
1.22%
Adrian Bunk
3
0.22%
1
1.22%
Tejun Heo
3
0.22%
1
1.22%
Paul Jackson
2
0.14%
1
1.22%
Vladimir Davydov
2
0.14%
1
1.22%
Andries E. Brouwer
1
0.07%
1
1.22%
Arjan van de Ven
1
0.07%
1
1.22%
Josef 'Jeff' Sipek
1
0.07%
1
1.22%
Brian Gerst
1
0.07%
1
1.22%
Johannes Weiner
1
0.07%
1
1.22%
Jan Blunck
1
0.07%
1
1.22%
Greg Kroah-Hartman
1
0.07%
1
1.22%
Alexey Dobriyan
0.00%
0
0.00%
Total
1390
100.00%
82
100.00%
Directory: fs/coda

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