microsoft
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WSL2-Linux-Kernel
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WSL2-Linux-Kernel/fs/gfs2/xattr.c

1496 строки
32 KiB
C
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/*
* 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 <asm/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;
}
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;
}
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;
}
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;
}
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;
}
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;
}
/**
* 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;
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;
}
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;
}
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;
}
}
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;
}
/**
* 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;
}
/**
* 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;
}
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;
}
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;
}
/**
* 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;
}
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;
}
/**
* 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;
}
/**
* 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 *sdp = GFS2_SB(&ip->i_inode);
int error;
ea->ea_data_len = cpu_to_be32(er->er_data_len);
ea->ea_name_len = er->er_name_len;
ea->ea_type = er->er_type;
ea->__pad = 0;
memcpy(GFS2_EA2NAME(ea), er->er_name, er->er_name_len);
if (GFS2_EAREQ_SIZE_STUFFED(er) <= sdp->sd_jbsize) {
ea->ea_num_ptrs = 0;
memcpy(GFS2_EA2DATA(ea), er->er_data, er->er_data_len);
} else {
__be64 *dataptr = GFS2_EA2DATAPTRS(ea);
const char *data = er->er_data;
unsigned int data_len = er->er_data_len;
unsigned int copy;
unsigned int x;
ea->ea_num_ptrs = DIV_ROUND_UP(er->er_data_len, sdp->sd_jbsize);
for (x = 0; x < ea->ea_num_ptrs; x++) {
struct buffer_head *bh;
u64 block;
int mh_size = sizeof(struct gfs2_meta_header);
unsigned int n = 1;
error = gfs2_alloc_blocks(ip, &block, &n, 0, NULL);
if (error)
return error;
gfs2_trans_add_unrevoke(sdp, block, 1);
bh = gfs2_meta_new(ip->i_gl, block);
gfs2_trans_add_meta(ip->i_gl, bh);
gfs2_metatype_set(bh, GFS2_METATYPE_ED, GFS2_FORMAT_ED);
gfs2_add_inode_blocks(&ip->i_inode, 1);
copy = data_len > sdp->sd_jbsize ? sdp->sd_jbsize :
data_len;
memcpy(bh->b_data + mh_size, data, copy);
if (copy < sdp->sd_jbsize)
memset(bh->b_data + mh_size + copy, 0,
sdp->sd_jbsize - copy);
*dataptr++ = cpu_to_be64(bh->b_blocknr);
data += copy;
data_len -= copy;
brelse(bh);
}
gfs2_assert_withdraw(sdp, !data_len);
}
return 0;
}
typedef int (*ea_skeleton_call_t) (struct gfs2_inode *ip,
struct gfs2_ea_request *er, void *private);
static int ea_alloc_skeleton(struct gfs2_inode *ip, struct gfs2_ea_request *er,
unsigned int blks,
ea_skeleton_call_t skeleton_call, void *private)
{
struct gfs2_alloc_parms ap = { .target = blks };
struct buffer_head *dibh;
int error;
error = gfs2_rindex_update(GFS2_SB(&ip->i_inode));
if (error)
return error;
error = gfs2_quota_lock_check(ip, &ap);
if (error)
return error;
error = gfs2_inplace_reserve(ip, &ap);
if (error)
goto out_gunlock_q;
error = gfs2_trans_begin(GFS2_SB(&ip->i_inode),
blks + gfs2_rg_blocks(ip, blks) +
RES_DINODE + RES_STATFS + RES_QUOTA, 0);
if (error)
goto out_ipres;
error = skeleton_call(ip, er, private);
if (error)
goto out_end_trans;
error = gfs2_meta_inode_buffer(ip, &dibh);
if (!error) {
ip->i_inode.i_ctime = CURRENT_TIME;
gfs2_trans_add_meta(ip->i_gl, dibh);
gfs2_dinode_out(ip, dibh->b_data);
brelse(dibh);
}
out_end_trans:
gfs2_trans_end(GFS2_SB(&ip->i_inode));
out_ipres:
gfs2_inplace_release(ip);
out_gunlock_q:
gfs2_quota_unlock(ip);
return error;
}
static int ea_init_i(struct gfs2_inode *ip, struct gfs2_ea_request *er,
void *private)
{
struct buffer_head *bh;
int error;
error = ea_alloc_blk(ip, &bh);
if (error)
return error;
ip->i_eattr = bh->b_blocknr;
error = ea_write(ip, GFS2_EA_BH2FIRST(bh), er);
brelse(bh);
return error;
}
/**
* ea_init - initializes a new eattr block
* @ip:
* @er:
*
* Returns: errno
*/
static int ea_init(struct gfs2_inode *ip, int type, const char *name,
const void *data, size_t size)
{
struct gfs2_ea_request er;
unsigned int jbsize = GFS2_SB(&ip->i_inode)->sd_jbsize;
unsigned int blks = 1;
er.er_type = type;
er.er_name = name;
er.er_name_len = strlen(name);
er.er_data = (void *)data;
er.er_data_len = size;
if (GFS2_EAREQ_SIZE_STUFFED(&er) > jbsize)
blks += DIV_ROUND_UP(er.er_data_len, jbsize);
return ea_alloc_skeleton(ip, &er, blks, ea_init_i, NULL);
}
static struct gfs2_ea_header *ea_split_ea(struct gfs2_ea_header *ea)
{
u32 ea_size = GFS2_EA_SIZE(ea);
struct gfs2_ea_header *new = (struct gfs2_ea_header *)((char *)ea +
ea_size);
u32 new_size = GFS2_EA_REC_LEN(ea) - ea_size;
int last = ea->ea_flags & GFS2_EAFLAG_LAST;
ea->ea_rec_len = cpu_to_be32(ea_size);
ea->ea_flags ^= last;
new->ea_rec_len = cpu_to_be32(new_size);
new->ea_flags = last;
return new;
}
static void ea_set_remove_stuffed(struct gfs2_inode *ip,
struct gfs2_ea_location *el)
{
struct gfs2_ea_header *ea = el->el_ea;
struct gfs2_ea_header *prev = el->el_prev;
u32 len;
gfs2_trans_add_meta(ip->i_gl, el->el_bh);
if (!prev || !GFS2_EA_IS_STUFFED(ea)) {
ea->ea_type = GFS2_EATYPE_UNUSED;
return;
} else if (GFS2_EA2NEXT(prev) != ea) {
prev = GFS2_EA2NEXT(prev);
gfs2_assert_withdraw(GFS2_SB(&ip->i_inode), GFS2_EA2NEXT(prev) == ea);
}
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;
}
struct ea_set {
int ea_split;
struct gfs2_ea_request *es_er;
struct gfs2_ea_location *es_el;
struct buffer_head *es_bh;
struct gfs2_ea_header *es_ea;
};
static int ea_set_simple_noalloc(struct gfs2_inode *ip, struct buffer_head *bh,
struct gfs2_ea_header *ea, struct ea_set *es)
{
struct gfs2_ea_request *er = es->es_er;
struct buffer_head *dibh;
int error;
error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + 2 * RES_EATTR, 0);
if (error)
return error;
gfs2_trans_add_meta(ip->i_gl, bh);
if (es->ea_split)
ea = ea_split_ea(ea);
ea_write(ip, ea, er);
if (es->es_el)
ea_set_remove_stuffed(ip, es->es_el);
error = gfs2_meta_inode_buffer(ip, &dibh);
if (error)
goto out;
ip->i_inode.i_ctime = CURRENT_TIME;
gfs2_trans_add_meta(ip->i_gl, dibh);
gfs2_dinode_out(ip, dibh->b_data);
brelse(dibh);
out:
gfs2_trans_end(GFS2_SB(&ip->i_inode));
return error;
}
static int ea_set_simple_alloc(struct gfs2_inode *ip,
struct gfs2_ea_request *er, void *private)
{
struct ea_set *es = private;
struct gfs2_ea_header *ea = es->es_ea;
int error;
gfs2_trans_add_meta(ip->i_gl, es->es_bh);
if (es->ea_split)
ea = ea_split_ea(ea);
error = ea_write(ip, ea, er);
if (error)
return error;
if (es->es_el)
ea_set_remove_stuffed(ip, es->es_el);
return 0;
}
static int ea_set_simple(struct gfs2_inode *ip, struct buffer_head *bh,
struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
void *private)
{
struct ea_set *es = private;
unsigned int size;
int stuffed;
int error;
stuffed = ea_calc_size(GFS2_SB(&ip->i_inode), es->es_er->er_name_len,
es->es_er->er_data_len, &size);
if (ea->ea_type == GFS2_EATYPE_UNUSED) {
if (GFS2_EA_REC_LEN(ea) < size)
return 0;
if (!GFS2_EA_IS_STUFFED(ea)) {
error = ea_remove_unstuffed(ip, bh, ea, prev, 1);
if (error)
return error;
}
es->ea_split = 0;
} else if (GFS2_EA_REC_LEN(ea) - GFS2_EA_SIZE(ea) >= size)
es->ea_split = 1;
else
return 0;
if (stuffed) {
error = ea_set_simple_noalloc(ip, bh, ea, es);
if (error)
return error;
} else {
unsigned int blks;
es->es_bh = bh;
es->es_ea = ea;
blks = 2 + DIV_ROUND_UP(es->es_er->er_data_len,
GFS2_SB(&ip->i_inode)->sd_jbsize);
error = ea_alloc_skeleton(ip, es->es_er, blks,
ea_set_simple_alloc, es);
if (error)
return error;
}
return 1;
}
static int ea_set_block(struct gfs2_inode *ip, struct gfs2_ea_request *er,
void *private)
{
struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
struct buffer_head *indbh, *newbh;
__be64 *eablk;
int error;
int mh_size = sizeof(struct gfs2_meta_header);
if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
__be64 *end;
error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, 0,
&indbh);
if (error)
return error;
if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
error = -EIO;
goto out;
}
eablk = (__be64 *)(indbh->b_data + mh_size);
end = eablk + sdp->sd_inptrs;
for (; eablk < end; eablk++)
if (!*eablk)
break;
if (eablk == end) {
error = -ENOSPC;
goto out;
}
gfs2_trans_add_meta(ip->i_gl, indbh);
} else {
u64 blk;
unsigned int n = 1;
error = gfs2_alloc_blocks(ip, &blk, &n, 0, NULL);
if (error)
return error;
gfs2_trans_add_unrevoke(sdp, blk, 1);
indbh = gfs2_meta_new(ip->i_gl, blk);
gfs2_trans_add_meta(ip->i_gl, indbh);
gfs2_metatype_set(indbh, GFS2_METATYPE_IN, GFS2_FORMAT_IN);
gfs2_buffer_clear_tail(indbh, mh_size);
eablk = (__be64 *)(indbh->b_data + mh_size);
*eablk = cpu_to_be64(ip->i_eattr);
ip->i_eattr = blk;
ip->i_diskflags |= GFS2_DIF_EA_INDIRECT;
gfs2_add_inode_blocks(&ip->i_inode, 1);
eablk++;
}
error = ea_alloc_blk(ip, &newbh);
if (error)
goto out;
*eablk = cpu_to_be64((u64)newbh->b_blocknr);
error = ea_write(ip, GFS2_EA_BH2FIRST(newbh), er);
brelse(newbh);
if (error)
goto out;
if (private)
ea_set_remove_stuffed(ip, private);
out:
brelse(indbh);
return error;
}
static int ea_set_i(struct gfs2_inode *ip, int type, const char *name,
const void *value, size_t size, struct gfs2_ea_location *el)
{
struct gfs2_ea_request er;
struct ea_set es;
unsigned int blks = 2;
int error;
er.er_type = type;
er.er_name = name;
er.er_data = (void *)value;
er.er_name_len = strlen(name);
er.er_data_len = size;
memset(&es, 0, sizeof(struct ea_set));
es.es_er = &er;
es.es_el = el;
error = ea_foreach(ip, ea_set_simple, &es);
if (error > 0)
return 0;
if (error)
return error;
if (!(ip->i_diskflags & GFS2_DIF_EA_INDIRECT))
blks++;
if (GFS2_EAREQ_SIZE_STUFFED(&er) > GFS2_SB(&ip->i_inode)->sd_jbsize)
blks += DIV_ROUND_UP(er.er_data_len, GFS2_SB(&ip->i_inode)->sd_jbsize);
return ea_alloc_skeleton(ip, &er, blks, ea_set_block, el);
}
static int ea_set_remove_unstuffed(struct gfs2_inode *ip,
struct gfs2_ea_location *el)
{
if (el->el_prev && GFS2_EA2NEXT(el->el_prev) != el->el_ea) {
el->el_prev = GFS2_EA2NEXT(el->el_prev);
gfs2_assert_withdraw(GFS2_SB(&ip->i_inode),
GFS2_EA2NEXT(el->el_prev) == el->el_ea);
}
return ea_remove_unstuffed(ip, el->el_bh, el->el_ea, el->el_prev, 0);
}
static int ea_remove_stuffed(struct gfs2_inode *ip, struct gfs2_ea_location *el)
{
struct gfs2_ea_header *ea = el->el_ea;
struct gfs2_ea_header *prev = el->el_prev;
struct buffer_head *dibh;
int error;
error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + RES_EATTR, 0);
if (error)
return error;
gfs2_trans_add_meta(ip->i_gl, el->el_bh);
if (prev) {
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;
}
error = gfs2_meta_inode_buffer(ip, &dibh);
if (!error) {
ip->i_inode.i_ctime = CURRENT_TIME;
gfs2_trans_add_meta(ip->i_gl, dibh);
gfs2_dinode_out(ip, dibh->b_data);
brelse(dibh);
}
gfs2_trans_end(GFS2_SB(&ip->i_inode));
return error;
}
/**
* gfs2_xattr_remove - Remove a GFS2 extended attribute
* @ip: The inode
* @type: The type of the extended attribute
* @name: The name of the extended attribute
*
* This is not called directly by the VFS since we use the (common)
* scheme of making a "set with NULL data" mean a remove request. Note
* that this is different from a set with zero length data.
*
* Returns: 0, or errno on failure
*/
static int gfs2_xattr_remove(struct gfs2_inode *ip, int type, const char *name)
{
struct gfs2_ea_location el;
int error;
if (!ip->i_eattr)
return -ENODATA;
error = gfs2_ea_find(ip, type, name, &el);
if (error)
return error;
if (!el.el_ea)
return -ENODATA;
if (GFS2_EA_IS_STUFFED(el.el_ea))
error = ea_remove_stuffed(ip, &el);
else
error = ea_remove_unstuffed(ip, el.el_bh, el.el_ea, el.el_prev, 0);
brelse(el.el_bh);
return error;
}
/**
* __gfs2_xattr_set - Set (or remove) a GFS2 extended attribute
* @ip: The inode
* @name: The name of the extended attribute
* @value: The value of the extended attribute (NULL for remove)
* @size: The size of the @value argument
* @flags: Create or Replace
* @type: The type of the extended attribute
*
* See gfs2_xattr_remove() for details of the removal of xattrs.
*
* Returns: 0 or errno on failure
*/
int __gfs2_xattr_set(struct inode *inode, const char *name,
const void *value, size_t size, int flags, int type)
{
struct gfs2_inode *ip = GFS2_I(inode);
struct gfs2_sbd *sdp = GFS2_SB(inode);
struct gfs2_ea_location el;
unsigned int namel = strlen(name);
int error;
if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
return -EPERM;
if (namel > GFS2_EA_MAX_NAME_LEN)
return -ERANGE;
if (value == NULL)
return gfs2_xattr_remove(ip, type, name);
if (ea_check_size(sdp, namel, size))
return -ERANGE;
if (!ip->i_eattr) {
if (flags & XATTR_REPLACE)
return -ENODATA;
return ea_init(ip, type, name, value, size);
}
error = gfs2_ea_find(ip, type, name, &el);
if (error)
return error;
if (el.el_ea) {
if (ip->i_diskflags & GFS2_DIF_APPENDONLY) {
brelse(el.el_bh);
return -EPERM;
}
error = -EEXIST;
if (!(flags & XATTR_CREATE)) {
int unstuffed = !GFS2_EA_IS_STUFFED(el.el_ea);
error = ea_set_i(ip, type, name, value, size, &el);
if (!error && unstuffed)
ea_set_remove_unstuffed(ip, &el);
}
brelse(el.el_bh);
return error;
}
error = -ENODATA;
if (!(flags & XATTR_REPLACE))
error = ea_set_i(ip, type, name, value, size, NULL);
return error;
}
static int gfs2_xattr_set(const struct xattr_handler *handler,
struct dentry *dentry, const char *name,
const void *value, size_t size, int flags)
{
struct inode *inode = d_inode(dentry);
struct gfs2_inode *ip = GFS2_I(inode);
struct gfs2_holder gh;
int ret;
ret = gfs2_rsqa_alloc(ip);
if (ret)
return ret;
ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
if (ret)
return ret;
ret = __gfs2_xattr_set(inode, name, value, size, flags, handler->flags);
gfs2_glock_dq_uninit(&gh);
return ret;
}
static int ea_dealloc_indirect(struct gfs2_inode *ip)
{
struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
struct gfs2_rgrp_list rlist;
struct buffer_head *indbh, *dibh;
__be64 *eablk, *end;
unsigned int rg_blocks = 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;
memset(&rlist, 0, sizeof(struct gfs2_rgrp_list));
error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, 0, &indbh);
if (error)
return error;
if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
error = -EIO;
goto out;
}
eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
end = eablk + sdp->sd_inptrs;
for (; eablk < end; eablk++) {
u64 bn;
if (!*eablk)
break;
bn = be64_to_cpu(*eablk);
if (bstart + blen == bn)
blen++;
else {
if (bstart)
gfs2_rlist_add(ip, &rlist, bstart);
bstart = bn;
blen = 1;
}
blks++;
}
if (bstart)
gfs2_rlist_add(ip, &rlist, bstart);
else
goto out;
gfs2_rlist_alloc(&rlist, LM_ST_EXCLUSIVE);
for (x = 0; x < rlist.rl_rgrps; x++) {
struct gfs2_rgrpd *rgd;
rgd = rlist.rl_ghs[x].gh_gl->gl_object;
rg_blocks += rgd->rd_length;
}
error = gfs2_glock_nq_m(rlist.rl_rgrps, rlist.rl_ghs);
if (error)
goto out_rlist_free;
error = gfs2_trans_begin(sdp, rg_blocks + RES_DINODE + RES_INDIRECT +
RES_STATFS + RES_QUOTA, blks);
if (error)
goto out_gunlock;
gfs2_trans_add_meta(ip->i_gl, indbh);
eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
bstart = 0;
blen = 0;
for (; eablk < end; eablk++) {
u64 bn;
if (!*eablk)
break;
bn = be64_to_cpu(*eablk);
if (bstart + blen == bn)
blen++;
else {
if (bstart)
gfs2_free_meta(ip, bstart, blen);
bstart = bn;
blen = 1;
}
*eablk = 0;
gfs2_add_inode_blocks(&ip->i_inode, -1);
}
if (bstart)
gfs2_free_meta(ip, bstart, blen);
ip->i_diskflags &= ~GFS2_DIF_EA_INDIRECT;
error = gfs2_meta_inode_buffer(ip, &dibh);
if (!error) {
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_m(rlist.rl_rgrps, rlist.rl_ghs);
out_rlist_free:
gfs2_rlist_free(&rlist);
out:
brelse(indbh);
return error;
}
static int ea_dealloc_block(struct gfs2_inode *ip)
{
struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
struct gfs2_rgrpd *rgd;
struct buffer_head *dibh;
struct gfs2_holder gh;
int error;
error = gfs2_rindex_update(sdp);
if (error)
return error;
rgd = gfs2_blk2rgrpd(sdp, ip->i_eattr, 1);
if (!rgd) {
gfs2_consist_inode(ip);
return -EIO;
}
error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &gh);
if (error)
return error;
error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_DINODE + RES_STATFS +
RES_QUOTA, 1);
if (error)
goto out_gunlock;
gfs2_free_meta(ip, ip->i_eattr, 1);
ip->i_eattr = 0;
gfs2_add_inode_blocks(&ip->i_inode, -1);
error = gfs2_meta_inode_buffer(ip, &dibh);
if (!error) {
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(&gh);
return error;
}
/**
* gfs2_ea_dealloc - deallocate the extended attribute fork
* @ip: the inode
*
* Returns: errno
*/
int gfs2_ea_dealloc(struct gfs2_inode *ip)
{
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)
return error;
error = ea_foreach(ip, ea_dealloc_unstuffed, NULL);
if (error)
goto out_quota;
if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
error = ea_dealloc_indirect(ip);
if (error)
goto out_quota;
}
error = ea_dealloc_block(ip);
out_quota:
gfs2_quota_unhold(ip);
return error;
}
static const struct xattr_handler gfs2_xattr_user_handler = {
.prefix = XATTR_USER_PREFIX,
.flags = GFS2_EATYPE_USR,
.get = gfs2_xattr_get,
.set = gfs2_xattr_set,
};
static const struct xattr_handler gfs2_xattr_security_handler = {
.prefix = XATTR_SECURITY_PREFIX,
.flags = GFS2_EATYPE_SECURITY,
.get = gfs2_xattr_get,
.set = gfs2_xattr_set,
};
const struct xattr_handler *gfs2_xattr_handlers[] = {
&gfs2_xattr_user_handler,
&gfs2_xattr_security_handler,
&posix_acl_access_xattr_handler,
&posix_acl_default_xattr_handler,
NULL,
};
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