Release 4.10 fs/gfs2/xattr.c

/*
 * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
 * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
 *
 * This copyrighted material is made available to anyone wishing to use,
 * modify, copy, or redistribute it subject to the terms and conditions
 * of the GNU General Public License version 2.
 */

#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/completion.h>
#include <linux/buffer_head.h>
#include <linux/xattr.h>
#include <linux/gfs2_ondisk.h>
#include <linux/posix_acl_xattr.h>
#include <linux/uaccess.h>

#include "gfs2.h"
#include "incore.h"
#include "acl.h"
#include "xattr.h"
#include "glock.h"
#include "inode.h"
#include "meta_io.h"
#include "quota.h"
#include "rgrp.h"
#include "trans.h"
#include "util.h"

/**
 * ea_calc_size - returns the acutal number of bytes the request will take up
 *                (not counting any unstuffed data blocks)
 * @sdp:
 * @er:
 * @size:
 *
 * Returns: 1 if the EA should be stuffed
 */



static int ea_calc_size(struct gfs2_sbd *sdp, unsigned int nsize, size_t dsize,
			unsigned int *size)
{
	unsigned int jbsize = sdp->sd_jbsize;

	/* Stuffed */
	*size = ALIGN(sizeof(struct gfs2_ea_header) + nsize + dsize, 8);

	if (*size <= jbsize)
		return 1;

	/* Unstuffed */
	*size = ALIGN(sizeof(struct gfs2_ea_header) + nsize +
		      (sizeof(__be64) * DIV_ROUND_UP(dsize, jbsize)), 8);

	return 0;
}

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static int ea_check_size(struct gfs2_sbd *sdp, unsigned int nsize, size_t dsize)
{
	unsigned int size;

	if (dsize > GFS2_EA_MAX_DATA_LEN)
		return -ERANGE;

	ea_calc_size(sdp, nsize, dsize, &size);

	/* This can only happen with 512 byte blocks */
	if (size > sdp->sd_jbsize)
		return -ERANGE;

	return 0;
}

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typedef int (*ea_call_t) (struct gfs2_inode *ip, struct buffer_head *bh,
			  struct gfs2_ea_header *ea,
			  struct gfs2_ea_header *prev, void *private);



static int ea_foreach_i(struct gfs2_inode *ip, struct buffer_head *bh,
			ea_call_t ea_call, void *data)
{
	struct gfs2_ea_header *ea, *prev = NULL;
	int error = 0;

	if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), bh, GFS2_METATYPE_EA))
		return -EIO;

	for (ea = GFS2_EA_BH2FIRST(bh);; prev = ea, ea = GFS2_EA2NEXT(ea)) {
		if (!GFS2_EA_REC_LEN(ea))
			goto fail;
		if (!(bh->b_data <= (char *)ea && (char *)GFS2_EA2NEXT(ea) <=
						  bh->b_data + bh->b_size))
			goto fail;
		if (!GFS2_EATYPE_VALID(ea->ea_type))
			goto fail;

		error = ea_call(ip, bh, ea, prev, data);
		if (error)
			return error;

		if (GFS2_EA_IS_LAST(ea)) {
			if ((char *)GFS2_EA2NEXT(ea) !=
			    bh->b_data + bh->b_size)
				goto fail;
			break;
		}
	}

	return error;

fail:
	gfs2_consist_inode(ip);
	return -EIO;
}

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static int ea_foreach(struct gfs2_inode *ip, ea_call_t ea_call, void *data)
{
	struct buffer_head *bh, *eabh;
	__be64 *eablk, *end;
	int error;

	error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, 0, &bh);
	if (error)
		return error;

	if (!(ip->i_diskflags & GFS2_DIF_EA_INDIRECT)) {
		error = ea_foreach_i(ip, bh, ea_call, data);
		goto out;
	}

	if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), bh, GFS2_METATYPE_IN)) {
		error = -EIO;
		goto out;
	}

	eablk = (__be64 *)(bh->b_data + sizeof(struct gfs2_meta_header));
	end = eablk + GFS2_SB(&ip->i_inode)->sd_inptrs;

	for (; eablk < end; eablk++) {
		u64 bn;

		if (!*eablk)
			break;
		bn = be64_to_cpu(*eablk);

		error = gfs2_meta_read(ip->i_gl, bn, DIO_WAIT, 0, &eabh);
		if (error)
			break;
		error = ea_foreach_i(ip, eabh, ea_call, data);
		brelse(eabh);
		if (error)
			break;
	}
out:
	brelse(bh);
	return error;
}

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david teigland
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steven whitehouse
13
5.49%
4
57.14%
andreas gruenbacher
andreas gruenbacher
4
1.69%
1
14.29%
al viro
al viro
2
0.84%
1
14.29%
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237
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7
100.00%


struct ea_find {
	
int type;
	
const char *name;
	
size_t namel;
	
struct gfs2_ea_location *ef_el;
};



static int ea_find_i(struct gfs2_inode *ip, struct buffer_head *bh,
		     struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
		     void *private)
{
	struct ea_find *ef = private;

	if (ea->ea_type == GFS2_EATYPE_UNUSED)
		return 0;

	if (ea->ea_type == ef->type) {
		if (ea->ea_name_len == ef->namel &&
		    !memcmp(GFS2_EA2NAME(ea), ef->name, ea->ea_name_len)) {
			struct gfs2_ea_location *el = ef->ef_el;
			get_bh(bh);
			el->el_bh = bh;
			el->el_ea = ea;
			el->el_prev = prev;
			return 1;
		}
	}

	return 0;
}

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david teigland
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static int gfs2_ea_find(struct gfs2_inode *ip, int type, const char *name,
			struct gfs2_ea_location *el)
{
	struct ea_find ef;
	int error;

	ef.type = type;
	ef.name = name;
	ef.namel = strlen(name);
	ef.ef_el = el;

	memset(el, 0, sizeof(struct gfs2_ea_location));

	error = ea_foreach(ip, ea_find_i, &ef);
	if (error > 0)
		return 0;

	return error;
}

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steven whitehouse
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/**
 * ea_dealloc_unstuffed -
 * @ip:
 * @bh:
 * @ea:
 * @prev:
 * @private:
 *
 * Take advantage of the fact that all unstuffed blocks are
 * allocated from the same RG.  But watch, this may not always
 * be true.
 *
 * Returns: errno
 */



static int ea_dealloc_unstuffed(struct gfs2_inode *ip, struct buffer_head *bh,
				struct gfs2_ea_header *ea,
				struct gfs2_ea_header *prev, void *private)
{
	int *leave = private;
	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
	struct gfs2_rgrpd *rgd;
	struct gfs2_holder rg_gh;
	struct buffer_head *dibh;
	__be64 *dataptrs;
	u64 bn = 0;
	u64 bstart = 0;
	unsigned int blen = 0;
	unsigned int blks = 0;
	unsigned int x;
	int error;

	error = gfs2_rindex_update(sdp);
	if (error)
		return error;

	if (GFS2_EA_IS_STUFFED(ea))
		return 0;

	dataptrs = GFS2_EA2DATAPTRS(ea);
	for (x = 0; x < ea->ea_num_ptrs; x++, dataptrs++) {
		if (*dataptrs) {
			blks++;
			bn = be64_to_cpu(*dataptrs);
		}
	}
	if (!blks)
		return 0;

	rgd = gfs2_blk2rgrpd(sdp, bn, 1);
	if (!rgd) {
		gfs2_consist_inode(ip);
		return -EIO;
	}

	error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &rg_gh);
	if (error)
		return error;

	error = gfs2_trans_begin(sdp, rgd->rd_length + RES_DINODE +
				 RES_EATTR + RES_STATFS + RES_QUOTA, blks);
	if (error)
		goto out_gunlock;

	gfs2_trans_add_meta(ip->i_gl, bh);

	dataptrs = GFS2_EA2DATAPTRS(ea);
	for (x = 0; x < ea->ea_num_ptrs; x++, dataptrs++) {
		if (!*dataptrs)
			break;
		bn = be64_to_cpu(*dataptrs);

		if (bstart + blen == bn)
			blen++;
		else {
			if (bstart)
				gfs2_free_meta(ip, bstart, blen);
			bstart = bn;
			blen = 1;
		}

		*dataptrs = 0;
		gfs2_add_inode_blocks(&ip->i_inode, -1);
	}
	if (bstart)
		gfs2_free_meta(ip, bstart, blen);

	if (prev && !leave) {
		u32 len;

		len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
		prev->ea_rec_len = cpu_to_be32(len);

		if (GFS2_EA_IS_LAST(ea))
			prev->ea_flags |= GFS2_EAFLAG_LAST;
	} else {
		ea->ea_type = GFS2_EATYPE_UNUSED;
		ea->ea_num_ptrs = 0;
	}

	error = gfs2_meta_inode_buffer(ip, &dibh);
	if (!error) {
		ip->i_inode.i_ctime = current_time(&ip->i_inode);
		gfs2_trans_add_meta(ip->i_gl, dibh);
		gfs2_dinode_out(ip, dibh->b_data);
		brelse(dibh);
	}

	gfs2_trans_end(sdp);

out_gunlock:
	gfs2_glock_dq_uninit(&rg_gh);
	return error;
}

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david teigland
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steven whitehouse
27
5.43%
9
69.23%
robert s. peterson
robert s. peterson
14
2.82%
1
7.69%
deepa dinamani
deepa dinamani
7
1.41%
1
7.69%
al viro
al viro
3
0.60%
1
7.69%
Total
497
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13
100.00%



static int ea_remove_unstuffed(struct gfs2_inode *ip, struct buffer_head *bh,
			       struct gfs2_ea_header *ea,
			       struct gfs2_ea_header *prev, int leave)
{
	int error;

	error = gfs2_rindex_update(GFS2_SB(&ip->i_inode));
	if (error)
		return error;

	error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
	if (error)
		goto out_alloc;

	error = ea_dealloc_unstuffed(ip, bh, ea, prev, (leave) ? &error : NULL);

	gfs2_quota_unhold(ip);
out_alloc:
	return error;
}

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david teigland
80
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33.33%
robert s. peterson
robert s. peterson
20
19.61%
1
33.33%
eric w. biederman
eric w. biederman
2
1.96%
1
33.33%
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102
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3
100.00%


struct ea_list {
	
struct gfs2_ea_request *ei_er;
	
unsigned int ei_size;
};



static inline unsigned int gfs2_ea_strlen(struct gfs2_ea_header *ea)
{
	switch (ea->ea_type) {
	case GFS2_EATYPE_USR:
		return 5 + ea->ea_name_len + 1;
	case GFS2_EATYPE_SYS:
		return 7 + ea->ea_name_len + 1;
	case GFS2_EATYPE_SECURITY:
		return 9 + ea->ea_name_len + 1;
	default:
		return 0;
	}
}

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static int ea_list_i(struct gfs2_inode *ip, struct buffer_head *bh,
		     struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
		     void *private)
{
	struct ea_list *ei = private;
	struct gfs2_ea_request *er = ei->ei_er;
	unsigned int ea_size = gfs2_ea_strlen(ea);

	if (ea->ea_type == GFS2_EATYPE_UNUSED)
		return 0;

	if (er->er_data_len) {
		char *prefix = NULL;
		unsigned int l = 0;
		char c = 0;

		if (ei->ei_size + ea_size > er->er_data_len)
			return -ERANGE;

		switch (ea->ea_type) {
		case GFS2_EATYPE_USR:
			prefix = "user.";
			l = 5;
			break;
		case GFS2_EATYPE_SYS:
			prefix = "system.";
			l = 7;
			break;
		case GFS2_EATYPE_SECURITY:
			prefix = "security.";
			l = 9;
			break;
		}

		BUG_ON(l == 0);

		memcpy(er->er_data + ei->ei_size, prefix, l);
		memcpy(er->er_data + ei->ei_size + l, GFS2_EA2NAME(ea),
		       ea->ea_name_len);
		memcpy(er->er_data + ei->ei_size + ea_size - 1, &c, 1);
	}

	ei->ei_size += ea_size;

	return 0;
}

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david teigland
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ryan o'hara
22
9.82%
1
33.33%
steven whitehouse
steven whitehouse
11
4.91%
1
33.33%
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224
100.00%
3
100.00%

/**
 * gfs2_listxattr - List gfs2 extended attributes
 * @dentry: The dentry whose inode we are interested in
 * @buffer: The buffer to write the results
 * @size: The size of the buffer
 *
 * Returns: actual size of data on success, -errno on error
 */



ssize_t gfs2_listxattr(struct dentry *dentry, char *buffer, size_t size)
{
	struct gfs2_inode *ip = GFS2_I(d_inode(dentry));
	struct gfs2_ea_request er;
	struct gfs2_holder i_gh;
	int error;

	memset(&er, 0, sizeof(struct gfs2_ea_request));
	if (size) {
		er.er_data = buffer;
		er.er_data_len = size;
	}

	error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
	if (error)
		return error;

	if (ip->i_eattr) {
		struct ea_list ei = { .ei_er = &er, .ei_size = 0 };

		error = ea_foreach(ip, ea_list_i, &ei);
		if (!error)
			error = ei.ei_size;
	}

	gfs2_glock_dq_uninit(&i_gh);

	return error;
}

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david teigland
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steven whitehouse
43
28.10%
2
50.00%
david howells
david howells
3
1.96%
1
25.00%
Total
153
100.00%
4
100.00%

/**
 * ea_iter_unstuffed - copies the unstuffed xattr data to/from the
 *                     request buffer
 * @ip: The GFS2 inode
 * @ea: The extended attribute header structure
 * @din: The data to be copied in
 * @dout: The data to be copied out (one of din,dout will be NULL)
 *
 * Returns: errno
 */



static int gfs2_iter_unstuffed(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
			       const char *din, char *dout)
{
	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
	struct buffer_head **bh;
	unsigned int amount = GFS2_EA_DATA_LEN(ea);
	unsigned int nptrs = DIV_ROUND_UP(amount, sdp->sd_jbsize);
	__be64 *dataptrs = GFS2_EA2DATAPTRS(ea);
	unsigned int x;
	int error = 0;
	unsigned char *pos;
	unsigned cp_size;

	bh = kcalloc(nptrs, sizeof(struct buffer_head *), GFP_NOFS);
	if (!bh)
		return -ENOMEM;

	for (x = 0; x < nptrs; x++) {
		error = gfs2_meta_read(ip->i_gl, be64_to_cpu(*dataptrs), 0, 0,
				       bh + x);
		if (error) {
			while (x--)
				brelse(bh[x]);
			goto out;
		}
		dataptrs++;
	}

	for (x = 0; x < nptrs; x++) {
		error = gfs2_meta_wait(sdp, bh[x]);
		if (error) {
			for (; x < nptrs; x++)
				brelse(bh[x]);
			goto out;
		}
		if (gfs2_metatype_check(sdp, bh[x], GFS2_METATYPE_ED)) {
			for (; x < nptrs; x++)
				brelse(bh[x]);
			error = -EIO;
			goto out;
		}

		pos = bh[x]->b_data + sizeof(struct gfs2_meta_header);
		cp_size = (sdp->sd_jbsize > amount) ? amount : sdp->sd_jbsize;

		if (dout) {
			memcpy(dout, pos, cp_size);
			dout += sdp->sd_jbsize;
		}

		if (din) {
			gfs2_trans_add_meta(ip->i_gl, bh[x]);
			memcpy(pos, din, cp_size);
			din += sdp->sd_jbsize;
		}

		amount -= sdp->sd_jbsize;
		brelse(bh[x]);
	}

out:
	kfree(bh);
	return error;
}

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david teigland
david teigland
303
78.70%
1
11.11%
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steven whitehouse
78
20.26%
5
55.56%
andreas gruenbacher
andreas gruenbacher
2
0.52%
1
11.11%
josef bacik
josef bacik
1
0.26%
1
11.11%
al viro
al viro
1
0.26%
1
11.11%
Total
385
100.00%
9
100.00%



static int gfs2_ea_get_copy(struct gfs2_inode *ip, struct gfs2_ea_location *el,
			    char *data, size_t size)
{
	int ret;
	size_t len = GFS2_EA_DATA_LEN(el->el_ea);
	if (len > size)
		return -ERANGE;

	if (GFS2_EA_IS_STUFFED(el->el_ea)) {
		memcpy(data, GFS2_EA2DATA(el->el_ea), len);
		return len;
	}
	ret = gfs2_iter_unstuffed(ip, el->el_ea, NULL, data);
	if (ret < 0)
		return ret;
	return len;
}

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david teigland
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25.00%
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steven whitehouse
46
45.54%
3
75.00%
Total
101
100.00%
4
100.00%



int gfs2_xattr_acl_get(struct gfs2_inode *ip, const char *name, char **ppdata)
{
	struct gfs2_ea_location el;
	int error;
	int len;
	char *data;

	error = gfs2_ea_find(ip, GFS2_EATYPE_SYS, name, &el);
	if (error)
		return error;
	if (!el.el_ea)
		goto out;
	if (!GFS2_EA_DATA_LEN(el.el_ea))
		goto out;

	len = GFS2_EA_DATA_LEN(el.el_ea);
	data = kmalloc(len, GFP_NOFS);
	error = -ENOMEM;
	if (data == NULL)
		goto out;

	error = gfs2_ea_get_copy(ip, &el, data, len);
	if (error < 0)
		kfree(data);
	else
		*ppdata = data;
out:
	brelse(el.el_bh);
	return error;
}

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153
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/**
 * gfs2_xattr_get - Get a GFS2 extended attribute
 * @inode: The inode
 * @name: The name of the extended attribute
 * @buffer: The buffer to write the result into
 * @size: The size of the buffer
 * @type: The type of extended attribute
 *
 * Returns: actual size of data on success, -errno on error
 */


static int __gfs2_xattr_get(struct inode *inode, const char *name,
			    void *buffer, size_t size, int type)
{
	struct gfs2_inode *ip = GFS2_I(inode);
	struct gfs2_ea_location el;
	int error;

	if (!ip->i_eattr)
		return -ENODATA;
	if (strlen(name) > GFS2_EA_MAX_NAME_LEN)
		return -EINVAL;

	error = gfs2_ea_find(ip, type, name, &el);
	if (error)
		return error;
	if (!el.el_ea)
		return -ENODATA;
	if (size)
		error = gfs2_ea_get_copy(ip, &el, buffer, size);
	else
		error = GFS2_EA_DATA_LEN(el.el_ea);
	brelse(el.el_bh);

	return error;
}

Contributors
Person
Tokens
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Commits
CommitProp
david teigland
david teigland
85
62.04%
1
16.67%
steven whitehouse
steven whitehouse
42
30.66%
2
33.33%
al viro
al viro
9
6.57%
2
33.33%
christoph hellwig
christoph hellwig
1
0.73%
1
16.67%
Total
137
100.00%
6
100.00%



static int gfs2_xattr_get(const struct xattr_handler *handler,
			  struct dentry *unused, struct inode *inode,
			  const char *name, void *buffer, size_t size)
{
	struct gfs2_inode *ip = GFS2_I(inode);
	struct gfs2_holder gh;
	bool need_unlock = false;
	int ret;

	/* During lookup, SELinux calls this function with the glock locked. */

	if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
		ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
		if (ret)
			return ret;
		need_unlock = true;
	}
	ret = __gfs2_xattr_get(inode, name, buffer, size, handler->flags);
	if (need_unlock)
		gfs2_glock_dq_uninit(&gh);
	return ret;
}

Contributors
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Tokens
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Commits
CommitProp
al viro
al viro
126
100.00%
1
100.00%
Total
126
100.00%
1
100.00%

/**
 * ea_alloc_blk - allocates a new block for extended attributes.
 * @ip: A pointer to the inode that's getting extended attributes
 * @bhp: Pointer to pointer to a struct buffer_head
 *
 * Returns: errno
 */



static int ea_alloc_blk(struct gfs2_inode *ip, struct buffer_head **bhp)
{
	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
	struct gfs2_ea_header *ea;
	unsigned int n = 1;
	u64 block;
	int error;

	error = gfs2_alloc_blocks(ip, &block, &n, 0, NULL);
	if (error)
		return error;
	gfs2_trans_add_unrevoke(sdp, block, 1);
	*bhp = gfs2_meta_new(ip->i_gl, block);
	gfs2_trans_add_meta(ip->i_gl, *bhp);
	gfs2_metatype_set(*bhp, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
	gfs2_buffer_clear_tail(*bhp, sizeof(struct gfs2_meta_header));

	ea = GFS2_EA_BH2FIRST(*bhp);
	ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
	ea->ea_type = GFS2_EATYPE_UNUSED;
	ea->ea_flags = GFS2_EAFLAG_LAST;
	ea->ea_num_ptrs = 0;

	gfs2_add_inode_blocks(&ip->i_inode, 1);

	return 0;
}

Contributors
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Tokens
Prop
Commits
CommitProp
david teigland
david teigland
120
68.97%
1
9.09%
steven whitehouse
steven whitehouse
49
28.16%
8
72.73%
robert s. peterson
robert s. peterson
5
2.87%
2
18.18%
Total
174
100.00%
11
100.00%

/**
 * ea_write - writes the request info to an ea, creating new blocks if
 *            necessary
 * @ip: inode that is being modified
 * @ea: the location of the new ea in a block
 * @er: the write request
 *
 * Note: does not update ea_rec_len or the GFS2_EAFLAG_LAST bin of ea_flags
 *
 * returns : errno
 */



static int ea_write(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
		    struct gfs2_ea_request *er)
{
	struct gfs2_sbd