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eattr.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/lm_interface.h>
#include <asm/uaccess.h>

#include "gfs2.h"
#include "incore.h"
#include "acl.h"
#include "eaops.h"
#include "eattr.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, struct gfs2_ea_request *er,
                  unsigned int *size)
{
      *size = GFS2_EAREQ_SIZE_STUFFED(er);
      if (*size <= sdp->sd_jbsize)
            return 1;

      *size = GFS2_EAREQ_SIZE_UNSTUFFED(sdp, er);

      return 0;
}

static int ea_check_size(struct gfs2_sbd *sdp, struct gfs2_ea_request *er)
{
      unsigned int size;

      if (er->er_data_len > GFS2_EA_MAX_DATA_LEN)
            return -ERANGE;

      ea_calc_size(sdp, er, &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_di.di_eattr, DIO_WAIT, &bh);
      if (error)
            return error;

      if (!(ip->i_di.di_flags & 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, &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 {
      struct gfs2_ea_request *ef_er;
      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;
      struct gfs2_ea_request *er = ef->ef_er;

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

      if (ea->ea_type == er->er_type) {
            if (ea->ea_name_len == er->er_name_len &&
                !memcmp(GFS2_EA2NAME(ea), er->er_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;
}

int gfs2_ea_find(struct gfs2_inode *ip, struct gfs2_ea_request *er,
             struct gfs2_ea_location *el)
{
      struct ea_find ef;
      int error;

      ef.ef_er = er;
      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;

      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);
      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_bh(ip->i_gl, bh, 1);

      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;
            if (!ip->i_di.di_blocks)
                  gfs2_consist_inode(ip);
            ip->i_di.di_blocks--;
            gfs2_set_inode_blocks(&ip->i_inode);
      }
      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_bh(ip->i_gl, dibh, 1);
            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)
{
      struct gfs2_alloc *al;
      int error;

      al = gfs2_alloc_get(ip);

      error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
      if (error)
            goto out_alloc;

      error = gfs2_rindex_hold(GFS2_SB(&ip->i_inode), &al->al_ri_gh);
      if (error)
            goto out_quota;

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

      gfs2_glock_dq_uninit(&al->al_ri_gh);

out_quota:
      gfs2_quota_unhold(ip);
out_alloc:
      gfs2_alloc_put(ip);
      return error;
}

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

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_ea_list -
 * @ip:
 * @er:
 *
 * Returns: actual size of data on success, -errno on error
 */

int gfs2_ea_list(struct gfs2_inode *ip, struct gfs2_ea_request *er)
{
      struct gfs2_holder i_gh;
      int error;

      if (!er->er_data || !er->er_data_len) {
            er->er_data = NULL;
            er->er_data_len = 0;
      }

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

      if (ip->i_di.di_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_get_unstuffed - actually copies the unstuffed data into the
 *                    request buffer
 * @ip: The GFS2 inode
 * @ea: The extended attribute header structure
 * @data: The data to be copied
 *
 * Returns: errno
 */

static int ea_get_unstuffed(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
                      char *data)
{
      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;

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

      for (x = 0; x < nptrs; x++) {
            error = gfs2_meta_read(ip->i_gl, be64_to_cpu(*dataptrs), 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;
            }

            memcpy(data, bh[x]->b_data + sizeof(struct gfs2_meta_header),
                   (sdp->sd_jbsize > amount) ? amount : sdp->sd_jbsize);

            amount -= sdp->sd_jbsize;
            data += sdp->sd_jbsize;

            brelse(bh[x]);
      }

out:
      kfree(bh);
      return error;
}

int gfs2_ea_get_copy(struct gfs2_inode *ip, struct gfs2_ea_location *el,
                 char *data)
{
      if (GFS2_EA_IS_STUFFED(el->el_ea)) {
            memcpy(data, GFS2_EA2DATA(el->el_ea), GFS2_EA_DATA_LEN(el->el_ea));
            return 0;
      } else
            return ea_get_unstuffed(ip, el->el_ea, data);
}

/**
 * gfs2_ea_get_i -
 * @ip: The GFS2 inode
 * @er: The request structure
 *
 * Returns: actual size of data on success, -errno on error
 */

int gfs2_ea_get_i(struct gfs2_inode *ip, struct gfs2_ea_request *er)
{
      struct gfs2_ea_location el;
      int error;

      if (!ip->i_di.di_eattr)
            return -ENODATA;

      error = gfs2_ea_find(ip, er, &el);
      if (error)
            return error;
      if (!el.el_ea)
            return -ENODATA;

      if (er->er_data_len) {
            if (GFS2_EA_DATA_LEN(el.el_ea) > er->er_data_len)
                  error =  -ERANGE;
            else
                  error = gfs2_ea_get_copy(ip, &el, er->er_data);
      }
      if (!error)
            error = GFS2_EA_DATA_LEN(el.el_ea);

      brelse(el.el_bh);

      return error;
}

/**
 * gfs2_ea_get -
 * @ip: The GFS2 inode
 * @er: The request structure
 *
 * Returns: actual size of data on success, -errno on error
 */

int gfs2_ea_get(struct gfs2_inode *ip, struct gfs2_ea_request *er)
{
      struct gfs2_holder i_gh;
      int error;

      if (!er->er_name_len ||
          er->er_name_len > GFS2_EA_MAX_NAME_LEN)
            return -EINVAL;
      if (!er->er_data || !er->er_data_len) {
            er->er_data = NULL;
            er->er_data_len = 0;
      }

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

      error = gfs2_ea_ops[er->er_type]->eo_get(ip, er);

      gfs2_glock_dq_uninit(&i_gh);

      return error;
}

/**
 * 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;
      u64 block;

      block = gfs2_alloc_meta(ip);

      *bhp = gfs2_meta_new(ip->i_gl, block);
      gfs2_trans_add_bh(ip->i_gl, *bhp, 1);
      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;

      ip->i_di.di_blocks++;
      gfs2_set_inode_blocks(&ip->i_inode);

      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);

      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);

                  block = gfs2_alloc_meta(ip);

                  bh = gfs2_meta_new(ip->i_gl, block);
                  gfs2_trans_add_bh(ip->i_gl, bh, 1);
                  gfs2_metatype_set(bh, GFS2_METATYPE_ED, GFS2_FORMAT_ED);

                  ip->i_di.di_blocks++;
                  gfs2_set_inode_blocks(&ip->i_inode);

                  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 *al;
      struct buffer_head *dibh;
      int error;

      al = gfs2_alloc_get(ip);

      error = gfs2_quota_lock(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
      if (error)
            goto out;

      error = gfs2_quota_check(ip, ip->i_inode.i_uid, ip->i_inode.i_gid);
      if (error)
            goto out_gunlock_q;

      al->al_requested = blks;

      error = gfs2_inplace_reserve(ip);
      if (error)
            goto out_gunlock_q;

      error = gfs2_trans_begin(GFS2_SB(&ip->i_inode),
                         blks + al->al_rgd->rd_length +
                         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) {
            if (er->er_flags & GFS2_ERF_MODE) {
                  gfs2_assert_withdraw(GFS2_SB(&ip->i_inode),
                                  (ip->i_inode.i_mode & S_IFMT) ==
                                  (er->er_mode & S_IFMT));
                  ip->i_inode.i_mode = er->er_mode;
            }
            ip->i_inode.i_ctime = CURRENT_TIME;
            gfs2_trans_add_bh(ip->i_gl, dibh, 1);
            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);
out:
      gfs2_alloc_put(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_di.di_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, struct gfs2_ea_request *er)
{
      unsigned int jbsize = GFS2_SB(&ip->i_inode)->sd_jbsize;
      unsigned int blks = 1;

      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_bh(ip->i_gl, el->el_bh, 1);

      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_bh(ip->i_gl, bh, 1);

      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;

      if (er->er_flags & GFS2_ERF_MODE) {
            gfs2_assert_withdraw(GFS2_SB(&ip->i_inode),
                  (ip->i_inode.i_mode & S_IFMT) == (er->er_mode & S_IFMT));
            ip->i_inode.i_mode = er->er_mode;
      }
      ip->i_inode.i_ctime = CURRENT_TIME;
      gfs2_trans_add_bh(ip->i_gl, dibh, 1);
      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_bh(ip->i_gl, es->es_bh, 1);

      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, &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_di.di_flags & GFS2_DIF_EA_INDIRECT) {
            __be64 *end;

            error = gfs2_meta_read(ip->i_gl, ip->i_di.di_eattr, DIO_WAIT,
                               &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_bh(ip->i_gl, indbh, 1);
      } else {
            u64 blk;

            blk = gfs2_alloc_meta(ip);

            indbh = gfs2_meta_new(ip->i_gl, blk);
            gfs2_trans_add_bh(ip->i_gl, indbh, 1);
            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_di.di_eattr);
            ip->i_di.di_eattr = blk;
            ip->i_di.di_flags |= GFS2_DIF_EA_INDIRECT;
            ip->i_di.di_blocks++;
            gfs2_set_inode_blocks(&ip->i_inode);

            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, struct gfs2_ea_request *er,
                struct gfs2_ea_location *el)
{
      struct ea_set es;
      unsigned int blks = 2;
      int error;

      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_di.di_flags & 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);
}

int gfs2_ea_set_i(struct gfs2_inode *ip, struct gfs2_ea_request *er)
{
      struct gfs2_ea_location el;
      int error;

      if (!ip->i_di.di_eattr) {
            if (er->er_flags & XATTR_REPLACE)
                  return -ENODATA;
            return ea_init(ip, er);
      }

      error = gfs2_ea_find(ip, er, &el);
      if (error)
            return error;

      if (el.el_ea) {
            if (ip->i_di.di_flags & GFS2_DIF_APPENDONLY) {
                  brelse(el.el_bh);
                  return -EPERM;
            }

            error = -EEXIST;
            if (!(er->er_flags & XATTR_CREATE)) {
                  int unstuffed = !GFS2_EA_IS_STUFFED(el.el_ea);
                  error = ea_set_i(ip, er, &el);
                  if (!error && unstuffed)
                        ea_set_remove_unstuffed(ip, &el);
            }

            brelse(el.el_bh);
      } else {
            error = -ENODATA;
            if (!(er->er_flags & XATTR_REPLACE))
                  error = ea_set_i(ip, er, NULL);
      }

      return error;
}

int gfs2_ea_set(struct gfs2_inode *ip, struct gfs2_ea_request *er)
{
      struct gfs2_holder i_gh;
      int error;

      if (!er->er_name_len || er->er_name_len > GFS2_EA_MAX_NAME_LEN)
            return -EINVAL;
      if (!er->er_data || !er->er_data_len) {
            er->er_data = NULL;
            er->er_data_len = 0;
      }
      error = ea_check_size(GFS2_SB(&ip->i_inode), er);
      if (error)
            return error;

      error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
      if (error)
            return error;

      if (IS_IMMUTABLE(&ip->i_inode))
            error = -EPERM;
      else
            error = gfs2_ea_ops[er->er_type]->eo_set(ip, er);

      gfs2_glock_dq_uninit(&i_gh);

      return error;
}

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_bh(ip->i_gl, el->el_bh, 1);

      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_bh(ip->i_gl, dibh, 1);
            gfs2_dinode_out(ip, dibh->b_data);
            brelse(dibh);
      }

      gfs2_trans_end(GFS2_SB(&ip->i_inode));

      return error;
}

int gfs2_ea_remove_i(struct gfs2_inode *ip, struct gfs2_ea_request *er)
{
      struct gfs2_ea_location el;
      int error;

      if (!ip->i_di.di_eattr)
            return -ENODATA;

      error = gfs2_ea_find(ip, er, &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_ea_remove - sets (or creates or replaces) an extended attribute
 * @ip: pointer to the inode of the target file
 * @er: request information
 *
 * Returns: errno
 */

int gfs2_ea_remove(struct gfs2_inode *ip, struct gfs2_ea_request *er)
{
      struct gfs2_holder i_gh;
      int error;

      if (!er->er_name_len || er->er_name_len > GFS2_EA_MAX_NAME_LEN)
            return -EINVAL;

      error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
      if (error)
            return error;

      if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
            error = -EPERM;
      else
            error = gfs2_ea_ops[er->er_type]->eo_remove(ip, er);

      gfs2_glock_dq_uninit(&i_gh);

      return error;
}

static int ea_acl_chmod_unstuffed(struct gfs2_inode *ip,
                          struct gfs2_ea_header *ea, char *data)
{
      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;

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

      error = gfs2_trans_begin(sdp, nptrs + RES_DINODE, 0);
      if (error)
            goto out;

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

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

            gfs2_trans_add_bh(ip->i_gl, bh[x], 1);

            memcpy(bh[x]->b_data + sizeof(struct gfs2_meta_header), data,
                   (sdp->sd_jbsize > amount) ? amount : sdp->sd_jbsize);

            amount -= sdp->sd_jbsize;
            data += sdp->sd_jbsize;

            brelse(bh[x]);
      }

out:
      kfree(bh);
      return error;

fail:
      gfs2_trans_end(sdp);
      kfree(bh);
      return error;
}

int gfs2_ea_acl_chmod(struct gfs2_inode *ip, struct gfs2_ea_location *el,
                  struct iattr *attr, char *data)
{
      struct buffer_head *dibh;
      int error;

      if (GFS2_EA_IS_STUFFED(el->el_ea)) {
            error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + RES_EATTR, 0);
            if (error)
                  return error;

            gfs2_trans_add_bh(ip->i_gl, el->el_bh, 1);
            memcpy(GFS2_EA2DATA(el->el_ea), data,
                   GFS2_EA_DATA_LEN(el->el_ea));
      } else
            error = ea_acl_chmod_unstuffed(ip, el->el_ea, data);

      if (error)
            return error;

      error = gfs2_meta_inode_buffer(ip, &dibh);
      if (!error) {
            error = inode_setattr(&ip->i_inode, attr);
            gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error);
            gfs2_trans_add_bh(ip->i_gl, dibh, 1);
            gfs2_dinode_out(ip, dibh->b_data);
            brelse(dibh);
      }

      gfs2_trans_end(GFS2_SB(&ip->i_inode));

      return error;
}

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;

      memset(&rlist, 0, sizeof(struct gfs2_rgrp_list));

      error = gfs2_meta_read(ip->i_gl, ip->i_di.di_eattr, DIO_WAIT, &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(sdp, &rlist, bstart);
                  bstart = bn;
                  blen = 1;
            }
            blks++;
      }
      if (bstart)
            gfs2_rlist_add(sdp, &rlist, bstart);
      else
            goto out;

      gfs2_rlist_alloc(&rlist, LM_ST_EXCLUSIVE, 0);

      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_bh(ip->i_gl, indbh, 1);

      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;
            if (!ip->i_di.di_blocks)
                  gfs2_consist_inode(ip);
            ip->i_di.di_blocks--;
            gfs2_set_inode_blocks(&ip->i_inode);
      }
      if (bstart)
            gfs2_free_meta(ip, bstart, blen);

      ip->i_di.di_flags &= ~GFS2_DIF_EA_INDIRECT;

      error = gfs2_meta_inode_buffer(ip, &dibh);
      if (!error) {
            gfs2_trans_add_bh(ip->i_gl, dibh, 1);
            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_alloc *al = &ip->i_alloc;
      struct gfs2_rgrpd *rgd;
      struct buffer_head *dibh;
      int error;

      rgd = gfs2_blk2rgrpd(sdp, ip->i_di.di_eattr);
      if (!rgd) {
            gfs2_consist_inode(ip);
            return -EIO;
      }

      error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0,
                           &al->al_rgd_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_di.di_eattr, 1);

      ip->i_di.di_eattr = 0;
      if (!ip->i_di.di_blocks)
            gfs2_consist_inode(ip);
      ip->i_di.di_blocks--;
      gfs2_set_inode_blocks(&ip->i_inode);

      error = gfs2_meta_inode_buffer(ip, &dibh);
      if (!error) {
            gfs2_trans_add_bh(ip->i_gl, dibh, 1);
            gfs2_dinode_out(ip, dibh->b_data);
            brelse(dibh);
      }

      gfs2_trans_end(sdp);

out_gunlock:
      gfs2_glock_dq_uninit(&al->al_rgd_gh);
      return error;
}

/**
 * gfs2_ea_dealloc - deallocate the extended attribute fork
 * @ip: the inode
 *
 * Returns: errno
 */

int gfs2_ea_dealloc(struct gfs2_inode *ip)
{
      struct gfs2_alloc *al;
      int error;

      al = gfs2_alloc_get(ip);

      error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
      if (error)
            goto out_alloc;

      error = gfs2_rindex_hold(GFS2_SB(&ip->i_inode), &al->al_ri_gh);
      if (error)
            goto out_quota;

      error = ea_foreach(ip, ea_dealloc_unstuffed, NULL);
      if (error)
            goto out_rindex;

      if (ip->i_di.di_flags & GFS2_DIF_EA_INDIRECT) {
            error = ea_dealloc_indirect(ip);
            if (error)
                  goto out_rindex;
      }

      error = ea_dealloc_block(ip);

out_rindex:
      gfs2_glock_dq_uninit(&al->al_ri_gh);
out_quota:
      gfs2_quota_unhold(ip);
out_alloc:
      gfs2_alloc_put(ip);
      return error;
}


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