![Joel Becker](/assets/img/avatar_default.png)
Use the db_check field of ocfs2_dir_block_trailer to crc/ecc the dirblocks. Signed-off-by: Joel Becker <joel.becker@oracle.com> Signed-off-by: Mark Fasheh <mfasheh@suse.com>
2029 lines
51 KiB
C
2029 lines
51 KiB
C
/* -*- mode: c; c-basic-offset: 8; -*-
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* vim: noexpandtab sw=8 ts=8 sts=0:
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*
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* dir.c
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*
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* Creates, reads, walks and deletes directory-nodes
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*
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* Copyright (C) 2002, 2004 Oracle. All rights reserved.
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*
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* Portions of this code from linux/fs/ext3/dir.c
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*
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* Copyright (C) 1992, 1993, 1994, 1995
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* Remy Card (card@masi.ibp.fr)
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* Laboratoire MASI - Institut Blaise pascal
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* Universite Pierre et Marie Curie (Paris VI)
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*
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* from
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*
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* linux/fs/minix/dir.c
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*
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* Copyright (C) 1991, 1992 Linux Torvalds
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*/
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#include <linux/fs.h>
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#include <linux/types.h>
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#include <linux/slab.h>
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#include <linux/highmem.h>
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#include <linux/quotaops.h>
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#define MLOG_MASK_PREFIX ML_NAMEI
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#include <cluster/masklog.h>
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#include "ocfs2.h"
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#include "alloc.h"
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#include "blockcheck.h"
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#include "dir.h"
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#include "dlmglue.h"
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#include "extent_map.h"
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#include "file.h"
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#include "inode.h"
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#include "journal.h"
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#include "namei.h"
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#include "suballoc.h"
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#include "super.h"
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#include "uptodate.h"
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#include "buffer_head_io.h"
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#define NAMEI_RA_CHUNKS 2
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#define NAMEI_RA_BLOCKS 4
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#define NAMEI_RA_SIZE (NAMEI_RA_CHUNKS * NAMEI_RA_BLOCKS)
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#define NAMEI_RA_INDEX(c,b) (((c) * NAMEI_RA_BLOCKS) + (b))
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static unsigned char ocfs2_filetype_table[] = {
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DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
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};
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static int ocfs2_extend_dir(struct ocfs2_super *osb,
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struct inode *dir,
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struct buffer_head *parent_fe_bh,
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unsigned int blocks_wanted,
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struct buffer_head **new_de_bh);
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static int ocfs2_do_extend_dir(struct super_block *sb,
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handle_t *handle,
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struct inode *dir,
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struct buffer_head *parent_fe_bh,
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struct ocfs2_alloc_context *data_ac,
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struct ocfs2_alloc_context *meta_ac,
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struct buffer_head **new_bh);
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/*
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* These are distinct checks because future versions of the file system will
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* want to have a trailing dirent structure independent of indexing.
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*/
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static int ocfs2_dir_has_trailer(struct inode *dir)
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{
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if (OCFS2_I(dir)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
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return 0;
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return ocfs2_meta_ecc(OCFS2_SB(dir->i_sb));
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}
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static int ocfs2_supports_dir_trailer(struct ocfs2_super *osb)
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{
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return ocfs2_meta_ecc(osb);
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}
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static inline unsigned int ocfs2_dir_trailer_blk_off(struct super_block *sb)
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{
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return sb->s_blocksize - sizeof(struct ocfs2_dir_block_trailer);
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}
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#define ocfs2_trailer_from_bh(_bh, _sb) ((struct ocfs2_dir_block_trailer *) ((_bh)->b_data + ocfs2_dir_trailer_blk_off((_sb))))
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/* XXX ocfs2_block_dqtrailer() is similar but not quite - can we make
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* them more consistent? */
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struct ocfs2_dir_block_trailer *ocfs2_dir_trailer_from_size(int blocksize,
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void *data)
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{
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char *p = data;
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p += blocksize - sizeof(struct ocfs2_dir_block_trailer);
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return (struct ocfs2_dir_block_trailer *)p;
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}
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/*
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* XXX: This is executed once on every dirent. We should consider optimizing
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* it.
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*/
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static int ocfs2_skip_dir_trailer(struct inode *dir,
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struct ocfs2_dir_entry *de,
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unsigned long offset,
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unsigned long blklen)
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{
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unsigned long toff = blklen - sizeof(struct ocfs2_dir_block_trailer);
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if (!ocfs2_dir_has_trailer(dir))
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return 0;
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if (offset != toff)
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return 0;
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return 1;
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}
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static void ocfs2_init_dir_trailer(struct inode *inode,
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struct buffer_head *bh)
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{
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struct ocfs2_dir_block_trailer *trailer;
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trailer = ocfs2_trailer_from_bh(bh, inode->i_sb);
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strcpy(trailer->db_signature, OCFS2_DIR_TRAILER_SIGNATURE);
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trailer->db_compat_rec_len =
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cpu_to_le16(sizeof(struct ocfs2_dir_block_trailer));
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trailer->db_parent_dinode = cpu_to_le64(OCFS2_I(inode)->ip_blkno);
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trailer->db_blkno = cpu_to_le64(bh->b_blocknr);
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}
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/*
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* bh passed here can be an inode block or a dir data block, depending
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* on the inode inline data flag.
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*/
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static int ocfs2_check_dir_entry(struct inode * dir,
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struct ocfs2_dir_entry * de,
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struct buffer_head * bh,
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unsigned long offset)
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{
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const char *error_msg = NULL;
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const int rlen = le16_to_cpu(de->rec_len);
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if (rlen < OCFS2_DIR_REC_LEN(1))
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error_msg = "rec_len is smaller than minimal";
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else if (rlen % 4 != 0)
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error_msg = "rec_len % 4 != 0";
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else if (rlen < OCFS2_DIR_REC_LEN(de->name_len))
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error_msg = "rec_len is too small for name_len";
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else if (((char *) de - bh->b_data) + rlen > dir->i_sb->s_blocksize)
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error_msg = "directory entry across blocks";
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if (error_msg != NULL)
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mlog(ML_ERROR, "bad entry in directory #%llu: %s - "
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"offset=%lu, inode=%llu, rec_len=%d, name_len=%d\n",
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(unsigned long long)OCFS2_I(dir)->ip_blkno, error_msg,
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offset, (unsigned long long)le64_to_cpu(de->inode), rlen,
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de->name_len);
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return error_msg == NULL ? 1 : 0;
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}
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static inline int ocfs2_match(int len,
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const char * const name,
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struct ocfs2_dir_entry *de)
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{
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if (len != de->name_len)
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return 0;
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if (!de->inode)
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return 0;
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return !memcmp(name, de->name, len);
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}
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/*
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* Returns 0 if not found, -1 on failure, and 1 on success
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*/
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static int inline ocfs2_search_dirblock(struct buffer_head *bh,
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struct inode *dir,
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const char *name, int namelen,
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unsigned long offset,
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char *first_de,
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unsigned int bytes,
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struct ocfs2_dir_entry **res_dir)
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{
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struct ocfs2_dir_entry *de;
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char *dlimit, *de_buf;
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int de_len;
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int ret = 0;
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mlog_entry_void();
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de_buf = first_de;
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dlimit = de_buf + bytes;
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while (de_buf < dlimit) {
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/* this code is executed quadratically often */
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/* do minimal checking `by hand' */
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de = (struct ocfs2_dir_entry *) de_buf;
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if (de_buf + namelen <= dlimit &&
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ocfs2_match(namelen, name, de)) {
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/* found a match - just to be sure, do a full check */
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if (!ocfs2_check_dir_entry(dir, de, bh, offset)) {
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ret = -1;
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goto bail;
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}
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*res_dir = de;
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ret = 1;
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goto bail;
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}
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/* prevent looping on a bad block */
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de_len = le16_to_cpu(de->rec_len);
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if (de_len <= 0) {
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ret = -1;
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goto bail;
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}
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de_buf += de_len;
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offset += de_len;
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}
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bail:
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mlog_exit(ret);
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return ret;
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}
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static struct buffer_head *ocfs2_find_entry_id(const char *name,
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int namelen,
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struct inode *dir,
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struct ocfs2_dir_entry **res_dir)
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{
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int ret, found;
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struct buffer_head *di_bh = NULL;
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struct ocfs2_dinode *di;
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struct ocfs2_inline_data *data;
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ret = ocfs2_read_inode_block(dir, &di_bh);
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if (ret) {
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mlog_errno(ret);
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goto out;
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}
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di = (struct ocfs2_dinode *)di_bh->b_data;
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data = &di->id2.i_data;
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found = ocfs2_search_dirblock(di_bh, dir, name, namelen, 0,
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data->id_data, i_size_read(dir), res_dir);
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if (found == 1)
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return di_bh;
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brelse(di_bh);
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out:
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return NULL;
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}
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static int ocfs2_validate_dir_block(struct super_block *sb,
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struct buffer_head *bh)
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{
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int rc;
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struct ocfs2_dir_block_trailer *trailer =
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ocfs2_trailer_from_bh(bh, sb);
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/*
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* We don't validate dirents here, that's handled
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* in-place when the code walks them.
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*/
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mlog(0, "Validating dirblock %llu\n",
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(unsigned long long)bh->b_blocknr);
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BUG_ON(!buffer_uptodate(bh));
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/*
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* If the ecc fails, we return the error but otherwise
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* leave the filesystem running. We know any error is
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* local to this block.
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*
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* Note that we are safe to call this even if the directory
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* doesn't have a trailer. Filesystems without metaecc will do
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* nothing, and filesystems with it will have one.
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*/
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rc = ocfs2_validate_meta_ecc(sb, bh->b_data, &trailer->db_check);
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if (rc)
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mlog(ML_ERROR, "Checksum failed for dinode %llu\n",
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(unsigned long long)bh->b_blocknr);
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return rc;
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}
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/*
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* This function forces all errors to -EIO for consistency with its
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* predecessor, ocfs2_bread(). We haven't audited what returning the
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* real error codes would do to callers. We log the real codes with
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* mlog_errno() before we squash them.
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*/
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static int ocfs2_read_dir_block(struct inode *inode, u64 v_block,
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struct buffer_head **bh, int flags)
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{
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int rc = 0;
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struct buffer_head *tmp = *bh;
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struct ocfs2_dir_block_trailer *trailer;
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rc = ocfs2_read_virt_blocks(inode, v_block, 1, &tmp, flags,
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ocfs2_validate_dir_block);
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if (rc) {
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mlog_errno(rc);
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goto out;
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}
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/*
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* We check the trailer here rather than in
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* ocfs2_validate_dir_block() because that function doesn't have
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* the inode to test.
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*/
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if (!(flags & OCFS2_BH_READAHEAD) &&
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ocfs2_dir_has_trailer(inode)) {
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trailer = ocfs2_trailer_from_bh(tmp, inode->i_sb);
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if (!OCFS2_IS_VALID_DIR_TRAILER(trailer)) {
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rc = -EINVAL;
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ocfs2_error(inode->i_sb,
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"Invalid dirblock #%llu: "
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"signature = %.*s\n",
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(unsigned long long)tmp->b_blocknr, 7,
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trailer->db_signature);
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goto out;
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}
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if (le64_to_cpu(trailer->db_blkno) != tmp->b_blocknr) {
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rc = -EINVAL;
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ocfs2_error(inode->i_sb,
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"Directory block #%llu has an invalid "
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"db_blkno of %llu",
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(unsigned long long)tmp->b_blocknr,
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(unsigned long long)le64_to_cpu(trailer->db_blkno));
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goto out;
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}
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if (le64_to_cpu(trailer->db_parent_dinode) !=
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OCFS2_I(inode)->ip_blkno) {
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rc = -EINVAL;
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ocfs2_error(inode->i_sb,
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"Directory block #%llu on dinode "
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"#%llu has an invalid parent_dinode "
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"of %llu",
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(unsigned long long)tmp->b_blocknr,
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(unsigned long long)OCFS2_I(inode)->ip_blkno,
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(unsigned long long)le64_to_cpu(trailer->db_blkno));
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goto out;
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}
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}
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/* If ocfs2_read_virt_blocks() got us a new bh, pass it up. */
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if (!*bh)
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*bh = tmp;
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out:
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return rc ? -EIO : 0;
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}
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static struct buffer_head *ocfs2_find_entry_el(const char *name, int namelen,
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struct inode *dir,
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struct ocfs2_dir_entry **res_dir)
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{
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struct super_block *sb;
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struct buffer_head *bh_use[NAMEI_RA_SIZE];
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struct buffer_head *bh, *ret = NULL;
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unsigned long start, block, b;
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int ra_max = 0; /* Number of bh's in the readahead
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buffer, bh_use[] */
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int ra_ptr = 0; /* Current index into readahead
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buffer */
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int num = 0;
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int nblocks, i, err;
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mlog_entry_void();
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sb = dir->i_sb;
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nblocks = i_size_read(dir) >> sb->s_blocksize_bits;
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start = OCFS2_I(dir)->ip_dir_start_lookup;
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if (start >= nblocks)
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start = 0;
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block = start;
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restart:
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do {
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/*
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* We deal with the read-ahead logic here.
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*/
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if (ra_ptr >= ra_max) {
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/* Refill the readahead buffer */
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ra_ptr = 0;
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b = block;
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for (ra_max = 0; ra_max < NAMEI_RA_SIZE; ra_max++) {
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/*
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* Terminate if we reach the end of the
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* directory and must wrap, or if our
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* search has finished at this block.
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*/
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if (b >= nblocks || (num && block == start)) {
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bh_use[ra_max] = NULL;
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break;
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}
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num++;
|
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|
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bh = NULL;
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err = ocfs2_read_dir_block(dir, b++, &bh,
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OCFS2_BH_READAHEAD);
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bh_use[ra_max] = bh;
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}
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}
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if ((bh = bh_use[ra_ptr++]) == NULL)
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goto next;
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if (ocfs2_read_dir_block(dir, block, &bh, 0)) {
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/* read error, skip block & hope for the best.
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* ocfs2_read_dir_block() has released the bh. */
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ocfs2_error(dir->i_sb, "reading directory %llu, "
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"offset %lu\n",
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(unsigned long long)OCFS2_I(dir)->ip_blkno,
|
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block);
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goto next;
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}
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i = ocfs2_search_dirblock(bh, dir, name, namelen,
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block << sb->s_blocksize_bits,
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bh->b_data, sb->s_blocksize,
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res_dir);
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if (i == 1) {
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OCFS2_I(dir)->ip_dir_start_lookup = block;
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ret = bh;
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goto cleanup_and_exit;
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} else {
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brelse(bh);
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if (i < 0)
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goto cleanup_and_exit;
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|
}
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next:
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if (++block >= nblocks)
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block = 0;
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} while (block != start);
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|
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/*
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* If the directory has grown while we were searching, then
|
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* search the last part of the directory before giving up.
|
|
*/
|
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block = nblocks;
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nblocks = i_size_read(dir) >> sb->s_blocksize_bits;
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if (block < nblocks) {
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start = 0;
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goto restart;
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}
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cleanup_and_exit:
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/* Clean up the read-ahead blocks */
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for (; ra_ptr < ra_max; ra_ptr++)
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brelse(bh_use[ra_ptr]);
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mlog_exit_ptr(ret);
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return ret;
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}
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|
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/*
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|
* Try to find an entry of the provided name within 'dir'.
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|
*
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* If nothing was found, NULL is returned. Otherwise, a buffer_head
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* and pointer to the dir entry are passed back.
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|
*
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|
* Caller can NOT assume anything about the contents of the
|
|
* buffer_head - it is passed back only so that it can be passed into
|
|
* any one of the manipulation functions (add entry, delete entry,
|
|
* etc). As an example, bh in the extent directory case is a data
|
|
* block, in the inline-data case it actually points to an inode.
|
|
*/
|
|
struct buffer_head *ocfs2_find_entry(const char *name, int namelen,
|
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struct inode *dir,
|
|
struct ocfs2_dir_entry **res_dir)
|
|
{
|
|
*res_dir = NULL;
|
|
|
|
if (OCFS2_I(dir)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
|
|
return ocfs2_find_entry_id(name, namelen, dir, res_dir);
|
|
|
|
return ocfs2_find_entry_el(name, namelen, dir, res_dir);
|
|
}
|
|
|
|
/*
|
|
* Update inode number and type of a previously found directory entry.
|
|
*/
|
|
int ocfs2_update_entry(struct inode *dir, handle_t *handle,
|
|
struct buffer_head *de_bh, struct ocfs2_dir_entry *de,
|
|
struct inode *new_entry_inode)
|
|
{
|
|
int ret;
|
|
ocfs2_journal_access_func access = ocfs2_journal_access_db;
|
|
|
|
/*
|
|
* The same code works fine for both inline-data and extent
|
|
* based directories, so no need to split this up. The only
|
|
* difference is the journal_access function.
|
|
*/
|
|
|
|
if (OCFS2_I(dir)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
|
|
access = ocfs2_journal_access_di;
|
|
|
|
ret = access(handle, dir, de_bh, OCFS2_JOURNAL_ACCESS_WRITE);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
de->inode = cpu_to_le64(OCFS2_I(new_entry_inode)->ip_blkno);
|
|
ocfs2_set_de_type(de, new_entry_inode->i_mode);
|
|
|
|
ocfs2_journal_dirty(handle, de_bh);
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static int __ocfs2_delete_entry(handle_t *handle, struct inode *dir,
|
|
struct ocfs2_dir_entry *de_del,
|
|
struct buffer_head *bh, char *first_de,
|
|
unsigned int bytes)
|
|
{
|
|
struct ocfs2_dir_entry *de, *pde;
|
|
int i, status = -ENOENT;
|
|
ocfs2_journal_access_func access = ocfs2_journal_access_db;
|
|
|
|
mlog_entry("(0x%p, 0x%p, 0x%p, 0x%p)\n", handle, dir, de_del, bh);
|
|
|
|
if (OCFS2_I(dir)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
|
|
access = ocfs2_journal_access_di;
|
|
|
|
i = 0;
|
|
pde = NULL;
|
|
de = (struct ocfs2_dir_entry *) first_de;
|
|
while (i < bytes) {
|
|
if (!ocfs2_check_dir_entry(dir, de, bh, i)) {
|
|
status = -EIO;
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
if (de == de_del) {
|
|
status = access(handle, dir, bh,
|
|
OCFS2_JOURNAL_ACCESS_WRITE);
|
|
if (status < 0) {
|
|
status = -EIO;
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
if (pde)
|
|
le16_add_cpu(&pde->rec_len,
|
|
le16_to_cpu(de->rec_len));
|
|
else
|
|
de->inode = 0;
|
|
dir->i_version++;
|
|
status = ocfs2_journal_dirty(handle, bh);
|
|
goto bail;
|
|
}
|
|
i += le16_to_cpu(de->rec_len);
|
|
pde = de;
|
|
de = (struct ocfs2_dir_entry *)((char *)de + le16_to_cpu(de->rec_len));
|
|
}
|
|
bail:
|
|
mlog_exit(status);
|
|
return status;
|
|
}
|
|
|
|
static inline int ocfs2_delete_entry_id(handle_t *handle,
|
|
struct inode *dir,
|
|
struct ocfs2_dir_entry *de_del,
|
|
struct buffer_head *bh)
|
|
{
|
|
int ret;
|
|
struct buffer_head *di_bh = NULL;
|
|
struct ocfs2_dinode *di;
|
|
struct ocfs2_inline_data *data;
|
|
|
|
ret = ocfs2_read_inode_block(dir, &di_bh);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
di = (struct ocfs2_dinode *)di_bh->b_data;
|
|
data = &di->id2.i_data;
|
|
|
|
ret = __ocfs2_delete_entry(handle, dir, de_del, bh, data->id_data,
|
|
i_size_read(dir));
|
|
|
|
brelse(di_bh);
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static inline int ocfs2_delete_entry_el(handle_t *handle,
|
|
struct inode *dir,
|
|
struct ocfs2_dir_entry *de_del,
|
|
struct buffer_head *bh)
|
|
{
|
|
return __ocfs2_delete_entry(handle, dir, de_del, bh, bh->b_data,
|
|
bh->b_size);
|
|
}
|
|
|
|
/*
|
|
* ocfs2_delete_entry deletes a directory entry by merging it with the
|
|
* previous entry
|
|
*/
|
|
int ocfs2_delete_entry(handle_t *handle,
|
|
struct inode *dir,
|
|
struct ocfs2_dir_entry *de_del,
|
|
struct buffer_head *bh)
|
|
{
|
|
if (OCFS2_I(dir)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
|
|
return ocfs2_delete_entry_id(handle, dir, de_del, bh);
|
|
|
|
return ocfs2_delete_entry_el(handle, dir, de_del, bh);
|
|
}
|
|
|
|
/*
|
|
* Check whether 'de' has enough room to hold an entry of
|
|
* 'new_rec_len' bytes.
|
|
*/
|
|
static inline int ocfs2_dirent_would_fit(struct ocfs2_dir_entry *de,
|
|
unsigned int new_rec_len)
|
|
{
|
|
unsigned int de_really_used;
|
|
|
|
/* Check whether this is an empty record with enough space */
|
|
if (le64_to_cpu(de->inode) == 0 &&
|
|
le16_to_cpu(de->rec_len) >= new_rec_len)
|
|
return 1;
|
|
|
|
/*
|
|
* Record might have free space at the end which we can
|
|
* use.
|
|
*/
|
|
de_really_used = OCFS2_DIR_REC_LEN(de->name_len);
|
|
if (le16_to_cpu(de->rec_len) >= (de_really_used + new_rec_len))
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* we don't always have a dentry for what we want to add, so people
|
|
* like orphan dir can call this instead.
|
|
*
|
|
* If you pass me insert_bh, I'll skip the search of the other dir
|
|
* blocks and put the record in there.
|
|
*/
|
|
int __ocfs2_add_entry(handle_t *handle,
|
|
struct inode *dir,
|
|
const char *name, int namelen,
|
|
struct inode *inode, u64 blkno,
|
|
struct buffer_head *parent_fe_bh,
|
|
struct buffer_head *insert_bh)
|
|
{
|
|
unsigned long offset;
|
|
unsigned short rec_len;
|
|
struct ocfs2_dir_entry *de, *de1;
|
|
struct ocfs2_dinode *di = (struct ocfs2_dinode *)parent_fe_bh->b_data;
|
|
struct super_block *sb = dir->i_sb;
|
|
int retval, status;
|
|
unsigned int size = sb->s_blocksize;
|
|
char *data_start = insert_bh->b_data;
|
|
|
|
mlog_entry_void();
|
|
|
|
if (!namelen)
|
|
return -EINVAL;
|
|
|
|
if (OCFS2_I(dir)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
|
|
data_start = di->id2.i_data.id_data;
|
|
size = i_size_read(dir);
|
|
|
|
BUG_ON(insert_bh != parent_fe_bh);
|
|
}
|
|
|
|
rec_len = OCFS2_DIR_REC_LEN(namelen);
|
|
offset = 0;
|
|
de = (struct ocfs2_dir_entry *) data_start;
|
|
while (1) {
|
|
BUG_ON((char *)de >= (size + data_start));
|
|
|
|
/* These checks should've already been passed by the
|
|
* prepare function, but I guess we can leave them
|
|
* here anyway. */
|
|
if (!ocfs2_check_dir_entry(dir, de, insert_bh, offset)) {
|
|
retval = -ENOENT;
|
|
goto bail;
|
|
}
|
|
if (ocfs2_match(namelen, name, de)) {
|
|
retval = -EEXIST;
|
|
goto bail;
|
|
}
|
|
|
|
/* We're guaranteed that we should have space, so we
|
|
* can't possibly have hit the trailer...right? */
|
|
mlog_bug_on_msg(ocfs2_skip_dir_trailer(dir, de, offset, size),
|
|
"Hit dir trailer trying to insert %.*s "
|
|
"(namelen %d) into directory %llu. "
|
|
"offset is %lu, trailer offset is %d\n",
|
|
namelen, name, namelen,
|
|
(unsigned long long)parent_fe_bh->b_blocknr,
|
|
offset, ocfs2_dir_trailer_blk_off(dir->i_sb));
|
|
|
|
if (ocfs2_dirent_would_fit(de, rec_len)) {
|
|
dir->i_mtime = dir->i_ctime = CURRENT_TIME;
|
|
retval = ocfs2_mark_inode_dirty(handle, dir, parent_fe_bh);
|
|
if (retval < 0) {
|
|
mlog_errno(retval);
|
|
goto bail;
|
|
}
|
|
|
|
if (insert_bh == parent_fe_bh)
|
|
status = ocfs2_journal_access_di(handle, dir,
|
|
insert_bh,
|
|
OCFS2_JOURNAL_ACCESS_WRITE);
|
|
else
|
|
status = ocfs2_journal_access_db(handle, dir,
|
|
insert_bh,
|
|
OCFS2_JOURNAL_ACCESS_WRITE);
|
|
/* By now the buffer is marked for journaling */
|
|
offset += le16_to_cpu(de->rec_len);
|
|
if (le64_to_cpu(de->inode)) {
|
|
de1 = (struct ocfs2_dir_entry *)((char *) de +
|
|
OCFS2_DIR_REC_LEN(de->name_len));
|
|
de1->rec_len =
|
|
cpu_to_le16(le16_to_cpu(de->rec_len) -
|
|
OCFS2_DIR_REC_LEN(de->name_len));
|
|
de->rec_len = cpu_to_le16(OCFS2_DIR_REC_LEN(de->name_len));
|
|
de = de1;
|
|
}
|
|
de->file_type = OCFS2_FT_UNKNOWN;
|
|
if (blkno) {
|
|
de->inode = cpu_to_le64(blkno);
|
|
ocfs2_set_de_type(de, inode->i_mode);
|
|
} else
|
|
de->inode = 0;
|
|
de->name_len = namelen;
|
|
memcpy(de->name, name, namelen);
|
|
|
|
dir->i_version++;
|
|
status = ocfs2_journal_dirty(handle, insert_bh);
|
|
retval = 0;
|
|
goto bail;
|
|
}
|
|
|
|
offset += le16_to_cpu(de->rec_len);
|
|
de = (struct ocfs2_dir_entry *) ((char *) de + le16_to_cpu(de->rec_len));
|
|
}
|
|
|
|
/* when you think about it, the assert above should prevent us
|
|
* from ever getting here. */
|
|
retval = -ENOSPC;
|
|
bail:
|
|
|
|
mlog_exit(retval);
|
|
return retval;
|
|
}
|
|
|
|
static int ocfs2_dir_foreach_blk_id(struct inode *inode,
|
|
u64 *f_version,
|
|
loff_t *f_pos, void *priv,
|
|
filldir_t filldir, int *filldir_err)
|
|
{
|
|
int ret, i, filldir_ret;
|
|
unsigned long offset = *f_pos;
|
|
struct buffer_head *di_bh = NULL;
|
|
struct ocfs2_dinode *di;
|
|
struct ocfs2_inline_data *data;
|
|
struct ocfs2_dir_entry *de;
|
|
|
|
ret = ocfs2_read_inode_block(inode, &di_bh);
|
|
if (ret) {
|
|
mlog(ML_ERROR, "Unable to read inode block for dir %llu\n",
|
|
(unsigned long long)OCFS2_I(inode)->ip_blkno);
|
|
goto out;
|
|
}
|
|
|
|
di = (struct ocfs2_dinode *)di_bh->b_data;
|
|
data = &di->id2.i_data;
|
|
|
|
while (*f_pos < i_size_read(inode)) {
|
|
revalidate:
|
|
/* If the dir block has changed since the last call to
|
|
* readdir(2), then we might be pointing to an invalid
|
|
* dirent right now. Scan from the start of the block
|
|
* to make sure. */
|
|
if (*f_version != inode->i_version) {
|
|
for (i = 0; i < i_size_read(inode) && i < offset; ) {
|
|
de = (struct ocfs2_dir_entry *)
|
|
(data->id_data + i);
|
|
/* It's too expensive to do a full
|
|
* dirent test each time round this
|
|
* loop, but we do have to test at
|
|
* least that it is non-zero. A
|
|
* failure will be detected in the
|
|
* dirent test below. */
|
|
if (le16_to_cpu(de->rec_len) <
|
|
OCFS2_DIR_REC_LEN(1))
|
|
break;
|
|
i += le16_to_cpu(de->rec_len);
|
|
}
|
|
*f_pos = offset = i;
|
|
*f_version = inode->i_version;
|
|
}
|
|
|
|
de = (struct ocfs2_dir_entry *) (data->id_data + *f_pos);
|
|
if (!ocfs2_check_dir_entry(inode, de, di_bh, *f_pos)) {
|
|
/* On error, skip the f_pos to the end. */
|
|
*f_pos = i_size_read(inode);
|
|
goto out;
|
|
}
|
|
offset += le16_to_cpu(de->rec_len);
|
|
if (le64_to_cpu(de->inode)) {
|
|
/* We might block in the next section
|
|
* if the data destination is
|
|
* currently swapped out. So, use a
|
|
* version stamp to detect whether or
|
|
* not the directory has been modified
|
|
* during the copy operation.
|
|
*/
|
|
u64 version = *f_version;
|
|
unsigned char d_type = DT_UNKNOWN;
|
|
|
|
if (de->file_type < OCFS2_FT_MAX)
|
|
d_type = ocfs2_filetype_table[de->file_type];
|
|
|
|
filldir_ret = filldir(priv, de->name,
|
|
de->name_len,
|
|
*f_pos,
|
|
le64_to_cpu(de->inode),
|
|
d_type);
|
|
if (filldir_ret) {
|
|
if (filldir_err)
|
|
*filldir_err = filldir_ret;
|
|
break;
|
|
}
|
|
if (version != *f_version)
|
|
goto revalidate;
|
|
}
|
|
*f_pos += le16_to_cpu(de->rec_len);
|
|
}
|
|
|
|
out:
|
|
brelse(di_bh);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ocfs2_dir_foreach_blk_el(struct inode *inode,
|
|
u64 *f_version,
|
|
loff_t *f_pos, void *priv,
|
|
filldir_t filldir, int *filldir_err)
|
|
{
|
|
int error = 0;
|
|
unsigned long offset, blk, last_ra_blk = 0;
|
|
int i, stored;
|
|
struct buffer_head * bh, * tmp;
|
|
struct ocfs2_dir_entry * de;
|
|
struct super_block * sb = inode->i_sb;
|
|
unsigned int ra_sectors = 16;
|
|
|
|
stored = 0;
|
|
bh = NULL;
|
|
|
|
offset = (*f_pos) & (sb->s_blocksize - 1);
|
|
|
|
while (!error && !stored && *f_pos < i_size_read(inode)) {
|
|
blk = (*f_pos) >> sb->s_blocksize_bits;
|
|
if (ocfs2_read_dir_block(inode, blk, &bh, 0)) {
|
|
/* Skip the corrupt dirblock and keep trying */
|
|
*f_pos += sb->s_blocksize - offset;
|
|
continue;
|
|
}
|
|
|
|
/* The idea here is to begin with 8k read-ahead and to stay
|
|
* 4k ahead of our current position.
|
|
*
|
|
* TODO: Use the pagecache for this. We just need to
|
|
* make sure it's cluster-safe... */
|
|
if (!last_ra_blk
|
|
|| (((last_ra_blk - blk) << 9) <= (ra_sectors / 2))) {
|
|
for (i = ra_sectors >> (sb->s_blocksize_bits - 9);
|
|
i > 0; i--) {
|
|
tmp = NULL;
|
|
if (!ocfs2_read_dir_block(inode, ++blk, &tmp,
|
|
OCFS2_BH_READAHEAD))
|
|
brelse(tmp);
|
|
}
|
|
last_ra_blk = blk;
|
|
ra_sectors = 8;
|
|
}
|
|
|
|
revalidate:
|
|
/* If the dir block has changed since the last call to
|
|
* readdir(2), then we might be pointing to an invalid
|
|
* dirent right now. Scan from the start of the block
|
|
* to make sure. */
|
|
if (*f_version != inode->i_version) {
|
|
for (i = 0; i < sb->s_blocksize && i < offset; ) {
|
|
de = (struct ocfs2_dir_entry *) (bh->b_data + i);
|
|
/* It's too expensive to do a full
|
|
* dirent test each time round this
|
|
* loop, but we do have to test at
|
|
* least that it is non-zero. A
|
|
* failure will be detected in the
|
|
* dirent test below. */
|
|
if (le16_to_cpu(de->rec_len) <
|
|
OCFS2_DIR_REC_LEN(1))
|
|
break;
|
|
i += le16_to_cpu(de->rec_len);
|
|
}
|
|
offset = i;
|
|
*f_pos = ((*f_pos) & ~(sb->s_blocksize - 1))
|
|
| offset;
|
|
*f_version = inode->i_version;
|
|
}
|
|
|
|
while (!error && *f_pos < i_size_read(inode)
|
|
&& offset < sb->s_blocksize) {
|
|
de = (struct ocfs2_dir_entry *) (bh->b_data + offset);
|
|
if (!ocfs2_check_dir_entry(inode, de, bh, offset)) {
|
|
/* On error, skip the f_pos to the
|
|
next block. */
|
|
*f_pos = ((*f_pos) | (sb->s_blocksize - 1)) + 1;
|
|
brelse(bh);
|
|
goto out;
|
|
}
|
|
offset += le16_to_cpu(de->rec_len);
|
|
if (le64_to_cpu(de->inode)) {
|
|
/* We might block in the next section
|
|
* if the data destination is
|
|
* currently swapped out. So, use a
|
|
* version stamp to detect whether or
|
|
* not the directory has been modified
|
|
* during the copy operation.
|
|
*/
|
|
unsigned long version = *f_version;
|
|
unsigned char d_type = DT_UNKNOWN;
|
|
|
|
if (de->file_type < OCFS2_FT_MAX)
|
|
d_type = ocfs2_filetype_table[de->file_type];
|
|
error = filldir(priv, de->name,
|
|
de->name_len,
|
|
*f_pos,
|
|
le64_to_cpu(de->inode),
|
|
d_type);
|
|
if (error) {
|
|
if (filldir_err)
|
|
*filldir_err = error;
|
|
break;
|
|
}
|
|
if (version != *f_version)
|
|
goto revalidate;
|
|
stored ++;
|
|
}
|
|
*f_pos += le16_to_cpu(de->rec_len);
|
|
}
|
|
offset = 0;
|
|
brelse(bh);
|
|
bh = NULL;
|
|
}
|
|
|
|
stored = 0;
|
|
out:
|
|
return stored;
|
|
}
|
|
|
|
static int ocfs2_dir_foreach_blk(struct inode *inode, u64 *f_version,
|
|
loff_t *f_pos, void *priv, filldir_t filldir,
|
|
int *filldir_err)
|
|
{
|
|
if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
|
|
return ocfs2_dir_foreach_blk_id(inode, f_version, f_pos, priv,
|
|
filldir, filldir_err);
|
|
|
|
return ocfs2_dir_foreach_blk_el(inode, f_version, f_pos, priv, filldir,
|
|
filldir_err);
|
|
}
|
|
|
|
/*
|
|
* This is intended to be called from inside other kernel functions,
|
|
* so we fake some arguments.
|
|
*/
|
|
int ocfs2_dir_foreach(struct inode *inode, loff_t *f_pos, void *priv,
|
|
filldir_t filldir)
|
|
{
|
|
int ret = 0, filldir_err = 0;
|
|
u64 version = inode->i_version;
|
|
|
|
while (*f_pos < i_size_read(inode)) {
|
|
ret = ocfs2_dir_foreach_blk(inode, &version, f_pos, priv,
|
|
filldir, &filldir_err);
|
|
if (ret || filldir_err)
|
|
break;
|
|
}
|
|
|
|
if (ret > 0)
|
|
ret = -EIO;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* ocfs2_readdir()
|
|
*
|
|
*/
|
|
int ocfs2_readdir(struct file * filp, void * dirent, filldir_t filldir)
|
|
{
|
|
int error = 0;
|
|
struct inode *inode = filp->f_path.dentry->d_inode;
|
|
int lock_level = 0;
|
|
|
|
mlog_entry("dirino=%llu\n",
|
|
(unsigned long long)OCFS2_I(inode)->ip_blkno);
|
|
|
|
error = ocfs2_inode_lock_atime(inode, filp->f_vfsmnt, &lock_level);
|
|
if (lock_level && error >= 0) {
|
|
/* We release EX lock which used to update atime
|
|
* and get PR lock again to reduce contention
|
|
* on commonly accessed directories. */
|
|
ocfs2_inode_unlock(inode, 1);
|
|
lock_level = 0;
|
|
error = ocfs2_inode_lock(inode, NULL, 0);
|
|
}
|
|
if (error < 0) {
|
|
if (error != -ENOENT)
|
|
mlog_errno(error);
|
|
/* we haven't got any yet, so propagate the error. */
|
|
goto bail_nolock;
|
|
}
|
|
|
|
error = ocfs2_dir_foreach_blk(inode, &filp->f_version, &filp->f_pos,
|
|
dirent, filldir, NULL);
|
|
|
|
ocfs2_inode_unlock(inode, lock_level);
|
|
|
|
bail_nolock:
|
|
mlog_exit(error);
|
|
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* NOTE: this should always be called with parent dir i_mutex taken.
|
|
*/
|
|
int ocfs2_find_files_on_disk(const char *name,
|
|
int namelen,
|
|
u64 *blkno,
|
|
struct inode *inode,
|
|
struct buffer_head **dirent_bh,
|
|
struct ocfs2_dir_entry **dirent)
|
|
{
|
|
int status = -ENOENT;
|
|
|
|
mlog_entry("(name=%.*s, blkno=%p, inode=%p, dirent_bh=%p, dirent=%p)\n",
|
|
namelen, name, blkno, inode, dirent_bh, dirent);
|
|
|
|
*dirent_bh = ocfs2_find_entry(name, namelen, inode, dirent);
|
|
if (!*dirent_bh || !*dirent) {
|
|
status = -ENOENT;
|
|
goto leave;
|
|
}
|
|
|
|
*blkno = le64_to_cpu((*dirent)->inode);
|
|
|
|
status = 0;
|
|
leave:
|
|
if (status < 0) {
|
|
*dirent = NULL;
|
|
brelse(*dirent_bh);
|
|
*dirent_bh = NULL;
|
|
}
|
|
|
|
mlog_exit(status);
|
|
return status;
|
|
}
|
|
|
|
/*
|
|
* Convenience function for callers which just want the block number
|
|
* mapped to a name and don't require the full dirent info, etc.
|
|
*/
|
|
int ocfs2_lookup_ino_from_name(struct inode *dir, const char *name,
|
|
int namelen, u64 *blkno)
|
|
{
|
|
int ret;
|
|
struct buffer_head *bh = NULL;
|
|
struct ocfs2_dir_entry *dirent = NULL;
|
|
|
|
ret = ocfs2_find_files_on_disk(name, namelen, blkno, dir, &bh, &dirent);
|
|
brelse(bh);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* Check for a name within a directory.
|
|
*
|
|
* Return 0 if the name does not exist
|
|
* Return -EEXIST if the directory contains the name
|
|
*
|
|
* Callers should have i_mutex + a cluster lock on dir
|
|
*/
|
|
int ocfs2_check_dir_for_entry(struct inode *dir,
|
|
const char *name,
|
|
int namelen)
|
|
{
|
|
int ret;
|
|
struct buffer_head *dirent_bh = NULL;
|
|
struct ocfs2_dir_entry *dirent = NULL;
|
|
|
|
mlog_entry("dir %llu, name '%.*s'\n",
|
|
(unsigned long long)OCFS2_I(dir)->ip_blkno, namelen, name);
|
|
|
|
ret = -EEXIST;
|
|
dirent_bh = ocfs2_find_entry(name, namelen, dir, &dirent);
|
|
if (dirent_bh)
|
|
goto bail;
|
|
|
|
ret = 0;
|
|
bail:
|
|
brelse(dirent_bh);
|
|
|
|
mlog_exit(ret);
|
|
return ret;
|
|
}
|
|
|
|
struct ocfs2_empty_dir_priv {
|
|
unsigned seen_dot;
|
|
unsigned seen_dot_dot;
|
|
unsigned seen_other;
|
|
};
|
|
static int ocfs2_empty_dir_filldir(void *priv, const char *name, int name_len,
|
|
loff_t pos, u64 ino, unsigned type)
|
|
{
|
|
struct ocfs2_empty_dir_priv *p = priv;
|
|
|
|
/*
|
|
* Check the positions of "." and ".." records to be sure
|
|
* they're in the correct place.
|
|
*/
|
|
if (name_len == 1 && !strncmp(".", name, 1) && pos == 0) {
|
|
p->seen_dot = 1;
|
|
return 0;
|
|
}
|
|
|
|
if (name_len == 2 && !strncmp("..", name, 2) &&
|
|
pos == OCFS2_DIR_REC_LEN(1)) {
|
|
p->seen_dot_dot = 1;
|
|
return 0;
|
|
}
|
|
|
|
p->seen_other = 1;
|
|
return 1;
|
|
}
|
|
/*
|
|
* routine to check that the specified directory is empty (for rmdir)
|
|
*
|
|
* Returns 1 if dir is empty, zero otherwise.
|
|
*/
|
|
int ocfs2_empty_dir(struct inode *inode)
|
|
{
|
|
int ret;
|
|
loff_t start = 0;
|
|
struct ocfs2_empty_dir_priv priv;
|
|
|
|
memset(&priv, 0, sizeof(priv));
|
|
|
|
ret = ocfs2_dir_foreach(inode, &start, &priv, ocfs2_empty_dir_filldir);
|
|
if (ret)
|
|
mlog_errno(ret);
|
|
|
|
if (!priv.seen_dot || !priv.seen_dot_dot) {
|
|
mlog(ML_ERROR, "bad directory (dir #%llu) - no `.' or `..'\n",
|
|
(unsigned long long)OCFS2_I(inode)->ip_blkno);
|
|
/*
|
|
* XXX: Is it really safe to allow an unlink to continue?
|
|
*/
|
|
return 1;
|
|
}
|
|
|
|
return !priv.seen_other;
|
|
}
|
|
|
|
/*
|
|
* Fills "." and ".." dirents in a new directory block. Returns dirent for
|
|
* "..", which might be used during creation of a directory with a trailing
|
|
* header. It is otherwise safe to ignore the return code.
|
|
*/
|
|
static struct ocfs2_dir_entry *ocfs2_fill_initial_dirents(struct inode *inode,
|
|
struct inode *parent,
|
|
char *start,
|
|
unsigned int size)
|
|
{
|
|
struct ocfs2_dir_entry *de = (struct ocfs2_dir_entry *)start;
|
|
|
|
de->inode = cpu_to_le64(OCFS2_I(inode)->ip_blkno);
|
|
de->name_len = 1;
|
|
de->rec_len =
|
|
cpu_to_le16(OCFS2_DIR_REC_LEN(de->name_len));
|
|
strcpy(de->name, ".");
|
|
ocfs2_set_de_type(de, S_IFDIR);
|
|
|
|
de = (struct ocfs2_dir_entry *) ((char *)de + le16_to_cpu(de->rec_len));
|
|
de->inode = cpu_to_le64(OCFS2_I(parent)->ip_blkno);
|
|
de->rec_len = cpu_to_le16(size - OCFS2_DIR_REC_LEN(1));
|
|
de->name_len = 2;
|
|
strcpy(de->name, "..");
|
|
ocfs2_set_de_type(de, S_IFDIR);
|
|
|
|
return de;
|
|
}
|
|
|
|
/*
|
|
* This works together with code in ocfs2_mknod_locked() which sets
|
|
* the inline-data flag and initializes the inline-data section.
|
|
*/
|
|
static int ocfs2_fill_new_dir_id(struct ocfs2_super *osb,
|
|
handle_t *handle,
|
|
struct inode *parent,
|
|
struct inode *inode,
|
|
struct buffer_head *di_bh)
|
|
{
|
|
int ret;
|
|
struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
|
|
struct ocfs2_inline_data *data = &di->id2.i_data;
|
|
unsigned int size = le16_to_cpu(data->id_count);
|
|
|
|
ret = ocfs2_journal_access_di(handle, inode, di_bh,
|
|
OCFS2_JOURNAL_ACCESS_WRITE);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
ocfs2_fill_initial_dirents(inode, parent, data->id_data, size);
|
|
|
|
ocfs2_journal_dirty(handle, di_bh);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
i_size_write(inode, size);
|
|
inode->i_nlink = 2;
|
|
inode->i_blocks = ocfs2_inode_sector_count(inode);
|
|
|
|
ret = ocfs2_mark_inode_dirty(handle, inode, di_bh);
|
|
if (ret < 0)
|
|
mlog_errno(ret);
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static int ocfs2_fill_new_dir_el(struct ocfs2_super *osb,
|
|
handle_t *handle,
|
|
struct inode *parent,
|
|
struct inode *inode,
|
|
struct buffer_head *fe_bh,
|
|
struct ocfs2_alloc_context *data_ac)
|
|
{
|
|
int status;
|
|
unsigned int size = osb->sb->s_blocksize;
|
|
struct buffer_head *new_bh = NULL;
|
|
struct ocfs2_dir_entry *de;
|
|
|
|
mlog_entry_void();
|
|
|
|
if (ocfs2_supports_dir_trailer(osb))
|
|
size = ocfs2_dir_trailer_blk_off(parent->i_sb);
|
|
|
|
status = ocfs2_do_extend_dir(osb->sb, handle, inode, fe_bh,
|
|
data_ac, NULL, &new_bh);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
ocfs2_set_new_buffer_uptodate(inode, new_bh);
|
|
|
|
status = ocfs2_journal_access_db(handle, inode, new_bh,
|
|
OCFS2_JOURNAL_ACCESS_CREATE);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
memset(new_bh->b_data, 0, osb->sb->s_blocksize);
|
|
|
|
de = ocfs2_fill_initial_dirents(inode, parent, new_bh->b_data, size);
|
|
if (ocfs2_supports_dir_trailer(osb))
|
|
ocfs2_init_dir_trailer(inode, new_bh);
|
|
|
|
status = ocfs2_journal_dirty(handle, new_bh);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
i_size_write(inode, inode->i_sb->s_blocksize);
|
|
inode->i_nlink = 2;
|
|
inode->i_blocks = ocfs2_inode_sector_count(inode);
|
|
status = ocfs2_mark_inode_dirty(handle, inode, fe_bh);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
status = 0;
|
|
bail:
|
|
brelse(new_bh);
|
|
|
|
mlog_exit(status);
|
|
return status;
|
|
}
|
|
|
|
int ocfs2_fill_new_dir(struct ocfs2_super *osb,
|
|
handle_t *handle,
|
|
struct inode *parent,
|
|
struct inode *inode,
|
|
struct buffer_head *fe_bh,
|
|
struct ocfs2_alloc_context *data_ac)
|
|
{
|
|
BUG_ON(!ocfs2_supports_inline_data(osb) && data_ac == NULL);
|
|
|
|
if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
|
|
return ocfs2_fill_new_dir_id(osb, handle, parent, inode, fe_bh);
|
|
|
|
return ocfs2_fill_new_dir_el(osb, handle, parent, inode, fe_bh,
|
|
data_ac);
|
|
}
|
|
|
|
/*
|
|
* Expand rec_len of the rightmost dirent in a directory block so that it
|
|
* contains the end of our valid space for dirents. We do this during
|
|
* expansion from an inline directory to one with extents. The first dir block
|
|
* in that case is taken from the inline data portion of the inode block.
|
|
*
|
|
* We add the dir trailer if this filesystem wants it.
|
|
*/
|
|
static void ocfs2_expand_last_dirent(char *start, unsigned int old_size,
|
|
struct super_block *sb)
|
|
{
|
|
struct ocfs2_dir_entry *de;
|
|
struct ocfs2_dir_entry *prev_de;
|
|
char *de_buf, *limit;
|
|
unsigned int new_size = sb->s_blocksize;
|
|
unsigned int bytes;
|
|
|
|
if (ocfs2_supports_dir_trailer(OCFS2_SB(sb)))
|
|
new_size = ocfs2_dir_trailer_blk_off(sb);
|
|
|
|
bytes = new_size - old_size;
|
|
|
|
limit = start + old_size;
|
|
de_buf = start;
|
|
de = (struct ocfs2_dir_entry *)de_buf;
|
|
do {
|
|
prev_de = de;
|
|
de_buf += le16_to_cpu(de->rec_len);
|
|
de = (struct ocfs2_dir_entry *)de_buf;
|
|
} while (de_buf < limit);
|
|
|
|
le16_add_cpu(&prev_de->rec_len, bytes);
|
|
}
|
|
|
|
/*
|
|
* We allocate enough clusters to fulfill "blocks_wanted", but set
|
|
* i_size to exactly one block. Ocfs2_extend_dir() will handle the
|
|
* rest automatically for us.
|
|
*
|
|
* *first_block_bh is a pointer to the 1st data block allocated to the
|
|
* directory.
|
|
*/
|
|
static int ocfs2_expand_inline_dir(struct inode *dir, struct buffer_head *di_bh,
|
|
unsigned int blocks_wanted,
|
|
struct buffer_head **first_block_bh)
|
|
{
|
|
u32 alloc, bit_off, len;
|
|
struct super_block *sb = dir->i_sb;
|
|
int ret, credits = ocfs2_inline_to_extents_credits(sb);
|
|
u64 blkno, bytes = blocks_wanted << sb->s_blocksize_bits;
|
|
struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
|
|
struct ocfs2_inode_info *oi = OCFS2_I(dir);
|
|
struct ocfs2_alloc_context *data_ac;
|
|
struct buffer_head *dirdata_bh = NULL;
|
|
struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
|
|
handle_t *handle;
|
|
struct ocfs2_extent_tree et;
|
|
int did_quota = 0;
|
|
|
|
ocfs2_init_dinode_extent_tree(&et, dir, di_bh);
|
|
|
|
alloc = ocfs2_clusters_for_bytes(sb, bytes);
|
|
|
|
/*
|
|
* We should never need more than 2 clusters for this -
|
|
* maximum dirent size is far less than one block. In fact,
|
|
* the only time we'd need more than one cluster is if
|
|
* blocksize == clustersize and the dirent won't fit in the
|
|
* extra space that the expansion to a single block gives. As
|
|
* of today, that only happens on 4k/4k file systems.
|
|
*/
|
|
BUG_ON(alloc > 2);
|
|
|
|
ret = ocfs2_reserve_clusters(osb, alloc, &data_ac);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
down_write(&oi->ip_alloc_sem);
|
|
|
|
/*
|
|
* Prepare for worst case allocation scenario of two separate
|
|
* extents.
|
|
*/
|
|
if (alloc == 2)
|
|
credits += OCFS2_SUBALLOC_ALLOC;
|
|
|
|
handle = ocfs2_start_trans(osb, credits);
|
|
if (IS_ERR(handle)) {
|
|
ret = PTR_ERR(handle);
|
|
mlog_errno(ret);
|
|
goto out_sem;
|
|
}
|
|
|
|
if (vfs_dq_alloc_space_nodirty(dir,
|
|
ocfs2_clusters_to_bytes(osb->sb, alloc))) {
|
|
ret = -EDQUOT;
|
|
goto out_commit;
|
|
}
|
|
did_quota = 1;
|
|
/*
|
|
* Try to claim as many clusters as the bitmap can give though
|
|
* if we only get one now, that's enough to continue. The rest
|
|
* will be claimed after the conversion to extents.
|
|
*/
|
|
ret = ocfs2_claim_clusters(osb, handle, data_ac, 1, &bit_off, &len);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out_commit;
|
|
}
|
|
|
|
/*
|
|
* Operations are carefully ordered so that we set up the new
|
|
* data block first. The conversion from inline data to
|
|
* extents follows.
|
|
*/
|
|
blkno = ocfs2_clusters_to_blocks(dir->i_sb, bit_off);
|
|
dirdata_bh = sb_getblk(sb, blkno);
|
|
if (!dirdata_bh) {
|
|
ret = -EIO;
|
|
mlog_errno(ret);
|
|
goto out_commit;
|
|
}
|
|
|
|
ocfs2_set_new_buffer_uptodate(dir, dirdata_bh);
|
|
|
|
ret = ocfs2_journal_access_db(handle, dir, dirdata_bh,
|
|
OCFS2_JOURNAL_ACCESS_CREATE);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out_commit;
|
|
}
|
|
|
|
memcpy(dirdata_bh->b_data, di->id2.i_data.id_data, i_size_read(dir));
|
|
memset(dirdata_bh->b_data + i_size_read(dir), 0,
|
|
sb->s_blocksize - i_size_read(dir));
|
|
ocfs2_expand_last_dirent(dirdata_bh->b_data, i_size_read(dir), sb);
|
|
if (ocfs2_supports_dir_trailer(osb))
|
|
ocfs2_init_dir_trailer(dir, dirdata_bh);
|
|
|
|
ret = ocfs2_journal_dirty(handle, dirdata_bh);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out_commit;
|
|
}
|
|
|
|
/*
|
|
* Set extent, i_size, etc on the directory. After this, the
|
|
* inode should contain the same exact dirents as before and
|
|
* be fully accessible from system calls.
|
|
*
|
|
* We let the later dirent insert modify c/mtime - to the user
|
|
* the data hasn't changed.
|
|
*/
|
|
ret = ocfs2_journal_access_di(handle, dir, di_bh,
|
|
OCFS2_JOURNAL_ACCESS_CREATE);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out_commit;
|
|
}
|
|
|
|
spin_lock(&oi->ip_lock);
|
|
oi->ip_dyn_features &= ~OCFS2_INLINE_DATA_FL;
|
|
di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
|
|
spin_unlock(&oi->ip_lock);
|
|
|
|
ocfs2_dinode_new_extent_list(dir, di);
|
|
|
|
i_size_write(dir, sb->s_blocksize);
|
|
dir->i_mtime = dir->i_ctime = CURRENT_TIME;
|
|
|
|
di->i_size = cpu_to_le64(sb->s_blocksize);
|
|
di->i_ctime = di->i_mtime = cpu_to_le64(dir->i_ctime.tv_sec);
|
|
di->i_ctime_nsec = di->i_mtime_nsec = cpu_to_le32(dir->i_ctime.tv_nsec);
|
|
|
|
/*
|
|
* This should never fail as our extent list is empty and all
|
|
* related blocks have been journaled already.
|
|
*/
|
|
ret = ocfs2_insert_extent(osb, handle, dir, &et, 0, blkno, len,
|
|
0, NULL);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out_commit;
|
|
}
|
|
|
|
/*
|
|
* Set i_blocks after the extent insert for the most up to
|
|
* date ip_clusters value.
|
|
*/
|
|
dir->i_blocks = ocfs2_inode_sector_count(dir);
|
|
|
|
ret = ocfs2_journal_dirty(handle, di_bh);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out_commit;
|
|
}
|
|
|
|
/*
|
|
* We asked for two clusters, but only got one in the 1st
|
|
* pass. Claim the 2nd cluster as a separate extent.
|
|
*/
|
|
if (alloc > len) {
|
|
ret = ocfs2_claim_clusters(osb, handle, data_ac, 1, &bit_off,
|
|
&len);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out_commit;
|
|
}
|
|
blkno = ocfs2_clusters_to_blocks(dir->i_sb, bit_off);
|
|
|
|
ret = ocfs2_insert_extent(osb, handle, dir, &et, 1,
|
|
blkno, len, 0, NULL);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out_commit;
|
|
}
|
|
}
|
|
|
|
*first_block_bh = dirdata_bh;
|
|
dirdata_bh = NULL;
|
|
|
|
out_commit:
|
|
if (ret < 0 && did_quota)
|
|
vfs_dq_free_space_nodirty(dir,
|
|
ocfs2_clusters_to_bytes(osb->sb, 2));
|
|
ocfs2_commit_trans(osb, handle);
|
|
|
|
out_sem:
|
|
up_write(&oi->ip_alloc_sem);
|
|
|
|
out:
|
|
if (data_ac)
|
|
ocfs2_free_alloc_context(data_ac);
|
|
|
|
brelse(dirdata_bh);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* returns a bh of the 1st new block in the allocation. */
|
|
static int ocfs2_do_extend_dir(struct super_block *sb,
|
|
handle_t *handle,
|
|
struct inode *dir,
|
|
struct buffer_head *parent_fe_bh,
|
|
struct ocfs2_alloc_context *data_ac,
|
|
struct ocfs2_alloc_context *meta_ac,
|
|
struct buffer_head **new_bh)
|
|
{
|
|
int status;
|
|
int extend, did_quota = 0;
|
|
u64 p_blkno, v_blkno;
|
|
|
|
spin_lock(&OCFS2_I(dir)->ip_lock);
|
|
extend = (i_size_read(dir) == ocfs2_clusters_to_bytes(sb, OCFS2_I(dir)->ip_clusters));
|
|
spin_unlock(&OCFS2_I(dir)->ip_lock);
|
|
|
|
if (extend) {
|
|
u32 offset = OCFS2_I(dir)->ip_clusters;
|
|
|
|
if (vfs_dq_alloc_space_nodirty(dir,
|
|
ocfs2_clusters_to_bytes(sb, 1))) {
|
|
status = -EDQUOT;
|
|
goto bail;
|
|
}
|
|
did_quota = 1;
|
|
|
|
status = ocfs2_add_inode_data(OCFS2_SB(sb), dir, &offset,
|
|
1, 0, parent_fe_bh, handle,
|
|
data_ac, meta_ac, NULL);
|
|
BUG_ON(status == -EAGAIN);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
}
|
|
|
|
v_blkno = ocfs2_blocks_for_bytes(sb, i_size_read(dir));
|
|
status = ocfs2_extent_map_get_blocks(dir, v_blkno, &p_blkno, NULL, NULL);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
*new_bh = sb_getblk(sb, p_blkno);
|
|
if (!*new_bh) {
|
|
status = -EIO;
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
status = 0;
|
|
bail:
|
|
if (did_quota && status < 0)
|
|
vfs_dq_free_space_nodirty(dir, ocfs2_clusters_to_bytes(sb, 1));
|
|
mlog_exit(status);
|
|
return status;
|
|
}
|
|
|
|
/*
|
|
* Assumes you already have a cluster lock on the directory.
|
|
*
|
|
* 'blocks_wanted' is only used if we have an inline directory which
|
|
* is to be turned into an extent based one. The size of the dirent to
|
|
* insert might be larger than the space gained by growing to just one
|
|
* block, so we may have to grow the inode by two blocks in that case.
|
|
*/
|
|
static int ocfs2_extend_dir(struct ocfs2_super *osb,
|
|
struct inode *dir,
|
|
struct buffer_head *parent_fe_bh,
|
|
unsigned int blocks_wanted,
|
|
struct buffer_head **new_de_bh)
|
|
{
|
|
int status = 0;
|
|
int credits, num_free_extents, drop_alloc_sem = 0;
|
|
loff_t dir_i_size;
|
|
struct ocfs2_dinode *fe = (struct ocfs2_dinode *) parent_fe_bh->b_data;
|
|
struct ocfs2_extent_list *el = &fe->id2.i_list;
|
|
struct ocfs2_alloc_context *data_ac = NULL;
|
|
struct ocfs2_alloc_context *meta_ac = NULL;
|
|
handle_t *handle = NULL;
|
|
struct buffer_head *new_bh = NULL;
|
|
struct ocfs2_dir_entry * de;
|
|
struct super_block *sb = osb->sb;
|
|
struct ocfs2_extent_tree et;
|
|
|
|
mlog_entry_void();
|
|
|
|
if (OCFS2_I(dir)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
|
|
status = ocfs2_expand_inline_dir(dir, parent_fe_bh,
|
|
blocks_wanted, &new_bh);
|
|
if (status) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
if (blocks_wanted == 1) {
|
|
/*
|
|
* If the new dirent will fit inside the space
|
|
* created by pushing out to one block, then
|
|
* we can complete the operation
|
|
* here. Otherwise we have to expand i_size
|
|
* and format the 2nd block below.
|
|
*/
|
|
BUG_ON(new_bh == NULL);
|
|
goto bail_bh;
|
|
}
|
|
|
|
/*
|
|
* Get rid of 'new_bh' - we want to format the 2nd
|
|
* data block and return that instead.
|
|
*/
|
|
brelse(new_bh);
|
|
new_bh = NULL;
|
|
|
|
dir_i_size = i_size_read(dir);
|
|
credits = OCFS2_SIMPLE_DIR_EXTEND_CREDITS;
|
|
goto do_extend;
|
|
}
|
|
|
|
dir_i_size = i_size_read(dir);
|
|
mlog(0, "extending dir %llu (i_size = %lld)\n",
|
|
(unsigned long long)OCFS2_I(dir)->ip_blkno, dir_i_size);
|
|
|
|
/* dir->i_size is always block aligned. */
|
|
spin_lock(&OCFS2_I(dir)->ip_lock);
|
|
if (dir_i_size == ocfs2_clusters_to_bytes(sb, OCFS2_I(dir)->ip_clusters)) {
|
|
spin_unlock(&OCFS2_I(dir)->ip_lock);
|
|
ocfs2_init_dinode_extent_tree(&et, dir, parent_fe_bh);
|
|
num_free_extents = ocfs2_num_free_extents(osb, dir, &et);
|
|
if (num_free_extents < 0) {
|
|
status = num_free_extents;
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
if (!num_free_extents) {
|
|
status = ocfs2_reserve_new_metadata(osb, el, &meta_ac);
|
|
if (status < 0) {
|
|
if (status != -ENOSPC)
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
}
|
|
|
|
status = ocfs2_reserve_clusters(osb, 1, &data_ac);
|
|
if (status < 0) {
|
|
if (status != -ENOSPC)
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
credits = ocfs2_calc_extend_credits(sb, el, 1);
|
|
} else {
|
|
spin_unlock(&OCFS2_I(dir)->ip_lock);
|
|
credits = OCFS2_SIMPLE_DIR_EXTEND_CREDITS;
|
|
}
|
|
|
|
do_extend:
|
|
down_write(&OCFS2_I(dir)->ip_alloc_sem);
|
|
drop_alloc_sem = 1;
|
|
|
|
handle = ocfs2_start_trans(osb, credits);
|
|
if (IS_ERR(handle)) {
|
|
status = PTR_ERR(handle);
|
|
handle = NULL;
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
status = ocfs2_do_extend_dir(osb->sb, handle, dir, parent_fe_bh,
|
|
data_ac, meta_ac, &new_bh);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
ocfs2_set_new_buffer_uptodate(dir, new_bh);
|
|
|
|
status = ocfs2_journal_access_db(handle, dir, new_bh,
|
|
OCFS2_JOURNAL_ACCESS_CREATE);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
memset(new_bh->b_data, 0, sb->s_blocksize);
|
|
|
|
de = (struct ocfs2_dir_entry *) new_bh->b_data;
|
|
de->inode = 0;
|
|
if (ocfs2_dir_has_trailer(dir)) {
|
|
de->rec_len = cpu_to_le16(ocfs2_dir_trailer_blk_off(sb));
|
|
ocfs2_init_dir_trailer(dir, new_bh);
|
|
} else {
|
|
de->rec_len = cpu_to_le16(sb->s_blocksize);
|
|
}
|
|
status = ocfs2_journal_dirty(handle, new_bh);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
dir_i_size += dir->i_sb->s_blocksize;
|
|
i_size_write(dir, dir_i_size);
|
|
dir->i_blocks = ocfs2_inode_sector_count(dir);
|
|
status = ocfs2_mark_inode_dirty(handle, dir, parent_fe_bh);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
bail_bh:
|
|
*new_de_bh = new_bh;
|
|
get_bh(*new_de_bh);
|
|
bail:
|
|
if (drop_alloc_sem)
|
|
up_write(&OCFS2_I(dir)->ip_alloc_sem);
|
|
if (handle)
|
|
ocfs2_commit_trans(osb, handle);
|
|
|
|
if (data_ac)
|
|
ocfs2_free_alloc_context(data_ac);
|
|
if (meta_ac)
|
|
ocfs2_free_alloc_context(meta_ac);
|
|
|
|
brelse(new_bh);
|
|
|
|
mlog_exit(status);
|
|
return status;
|
|
}
|
|
|
|
static int ocfs2_find_dir_space_id(struct inode *dir, struct buffer_head *di_bh,
|
|
const char *name, int namelen,
|
|
struct buffer_head **ret_de_bh,
|
|
unsigned int *blocks_wanted)
|
|
{
|
|
int ret;
|
|
struct super_block *sb = dir->i_sb;
|
|
struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
|
|
struct ocfs2_dir_entry *de, *last_de = NULL;
|
|
char *de_buf, *limit;
|
|
unsigned long offset = 0;
|
|
unsigned int rec_len, new_rec_len, free_space = dir->i_sb->s_blocksize;
|
|
|
|
/*
|
|
* This calculates how many free bytes we'd have in block zero, should
|
|
* this function force expansion to an extent tree.
|
|
*/
|
|
if (ocfs2_supports_dir_trailer(OCFS2_SB(sb)))
|
|
free_space = ocfs2_dir_trailer_blk_off(sb) - i_size_read(dir);
|
|
else
|
|
free_space = dir->i_sb->s_blocksize - i_size_read(dir);
|
|
|
|
de_buf = di->id2.i_data.id_data;
|
|
limit = de_buf + i_size_read(dir);
|
|
rec_len = OCFS2_DIR_REC_LEN(namelen);
|
|
|
|
while (de_buf < limit) {
|
|
de = (struct ocfs2_dir_entry *)de_buf;
|
|
|
|
if (!ocfs2_check_dir_entry(dir, de, di_bh, offset)) {
|
|
ret = -ENOENT;
|
|
goto out;
|
|
}
|
|
if (ocfs2_match(namelen, name, de)) {
|
|
ret = -EEXIST;
|
|
goto out;
|
|
}
|
|
/*
|
|
* No need to check for a trailing dirent record here as
|
|
* they're not used for inline dirs.
|
|
*/
|
|
|
|
if (ocfs2_dirent_would_fit(de, rec_len)) {
|
|
/* Ok, we found a spot. Return this bh and let
|
|
* the caller actually fill it in. */
|
|
*ret_de_bh = di_bh;
|
|
get_bh(*ret_de_bh);
|
|
ret = 0;
|
|
goto out;
|
|
}
|
|
|
|
last_de = de;
|
|
de_buf += le16_to_cpu(de->rec_len);
|
|
offset += le16_to_cpu(de->rec_len);
|
|
}
|
|
|
|
/*
|
|
* We're going to require expansion of the directory - figure
|
|
* out how many blocks we'll need so that a place for the
|
|
* dirent can be found.
|
|
*/
|
|
*blocks_wanted = 1;
|
|
new_rec_len = le16_to_cpu(last_de->rec_len) + free_space;
|
|
if (new_rec_len < (rec_len + OCFS2_DIR_REC_LEN(last_de->name_len)))
|
|
*blocks_wanted = 2;
|
|
|
|
ret = -ENOSPC;
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static int ocfs2_find_dir_space_el(struct inode *dir, const char *name,
|
|
int namelen, struct buffer_head **ret_de_bh)
|
|
{
|
|
unsigned long offset;
|
|
struct buffer_head *bh = NULL;
|
|
unsigned short rec_len;
|
|
struct ocfs2_dir_entry *de;
|
|
struct super_block *sb = dir->i_sb;
|
|
int status;
|
|
int blocksize = dir->i_sb->s_blocksize;
|
|
|
|
status = ocfs2_read_dir_block(dir, 0, &bh, 0);
|
|
if (status) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
rec_len = OCFS2_DIR_REC_LEN(namelen);
|
|
offset = 0;
|
|
de = (struct ocfs2_dir_entry *) bh->b_data;
|
|
while (1) {
|
|
if ((char *)de >= sb->s_blocksize + bh->b_data) {
|
|
brelse(bh);
|
|
bh = NULL;
|
|
|
|
if (i_size_read(dir) <= offset) {
|
|
/*
|
|
* Caller will have to expand this
|
|
* directory.
|
|
*/
|
|
status = -ENOSPC;
|
|
goto bail;
|
|
}
|
|
status = ocfs2_read_dir_block(dir,
|
|
offset >> sb->s_blocksize_bits,
|
|
&bh, 0);
|
|
if (status) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
/* move to next block */
|
|
de = (struct ocfs2_dir_entry *) bh->b_data;
|
|
}
|
|
if (!ocfs2_check_dir_entry(dir, de, bh, offset)) {
|
|
status = -ENOENT;
|
|
goto bail;
|
|
}
|
|
if (ocfs2_match(namelen, name, de)) {
|
|
status = -EEXIST;
|
|
goto bail;
|
|
}
|
|
|
|
if (ocfs2_skip_dir_trailer(dir, de, offset % blocksize,
|
|
blocksize))
|
|
goto next;
|
|
|
|
if (ocfs2_dirent_would_fit(de, rec_len)) {
|
|
/* Ok, we found a spot. Return this bh and let
|
|
* the caller actually fill it in. */
|
|
*ret_de_bh = bh;
|
|
get_bh(*ret_de_bh);
|
|
status = 0;
|
|
goto bail;
|
|
}
|
|
next:
|
|
offset += le16_to_cpu(de->rec_len);
|
|
de = (struct ocfs2_dir_entry *)((char *) de + le16_to_cpu(de->rec_len));
|
|
}
|
|
|
|
status = 0;
|
|
bail:
|
|
brelse(bh);
|
|
|
|
mlog_exit(status);
|
|
return status;
|
|
}
|
|
|
|
int ocfs2_prepare_dir_for_insert(struct ocfs2_super *osb,
|
|
struct inode *dir,
|
|
struct buffer_head *parent_fe_bh,
|
|
const char *name,
|
|
int namelen,
|
|
struct buffer_head **ret_de_bh)
|
|
{
|
|
int ret;
|
|
unsigned int blocks_wanted = 1;
|
|
struct buffer_head *bh = NULL;
|
|
|
|
mlog(0, "getting ready to insert namelen %d into dir %llu\n",
|
|
namelen, (unsigned long long)OCFS2_I(dir)->ip_blkno);
|
|
|
|
*ret_de_bh = NULL;
|
|
|
|
if (!namelen) {
|
|
ret = -EINVAL;
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
if (OCFS2_I(dir)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
|
|
ret = ocfs2_find_dir_space_id(dir, parent_fe_bh, name,
|
|
namelen, &bh, &blocks_wanted);
|
|
} else
|
|
ret = ocfs2_find_dir_space_el(dir, name, namelen, &bh);
|
|
|
|
if (ret && ret != -ENOSPC) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
if (ret == -ENOSPC) {
|
|
/*
|
|
* We have to expand the directory to add this name.
|
|
*/
|
|
BUG_ON(bh);
|
|
|
|
ret = ocfs2_extend_dir(osb, dir, parent_fe_bh, blocks_wanted,
|
|
&bh);
|
|
if (ret) {
|
|
if (ret != -ENOSPC)
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
BUG_ON(!bh);
|
|
}
|
|
|
|
*ret_de_bh = bh;
|
|
bh = NULL;
|
|
out:
|
|
brelse(bh);
|
|
return ret;
|
|
}
|