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9343ee7690
Stop directly referencing b_bn in code outside the buffer cache, as b_bn is supposed to be used only as an internal cache index. Signed-off-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Darrick J. Wong <djwong@kernel.org> Signed-off-by: Darrick J. Wong <djwong@kernel.org>
1224 lines
33 KiB
C
1224 lines
33 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2000-2002,2005 Silicon Graphics, Inc.
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* Copyright (c) 2013 Red Hat, Inc.
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* All Rights Reserved.
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*/
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#include "xfs.h"
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#include "xfs_fs.h"
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#include "xfs_shared.h"
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#include "xfs_format.h"
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#include "xfs_log_format.h"
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#include "xfs_trans_resv.h"
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#include "xfs_mount.h"
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#include "xfs_inode.h"
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#include "xfs_dir2.h"
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#include "xfs_dir2_priv.h"
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#include "xfs_error.h"
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#include "xfs_trans.h"
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#include "xfs_buf_item.h"
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#include "xfs_log.h"
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static xfs_failaddr_t xfs_dir2_data_freefind_verify(
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struct xfs_dir2_data_hdr *hdr, struct xfs_dir2_data_free *bf,
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struct xfs_dir2_data_unused *dup,
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struct xfs_dir2_data_free **bf_ent);
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struct xfs_dir2_data_free *
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xfs_dir2_data_bestfree_p(
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struct xfs_mount *mp,
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struct xfs_dir2_data_hdr *hdr)
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{
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if (xfs_has_crc(mp))
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return ((struct xfs_dir3_data_hdr *)hdr)->best_free;
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return hdr->bestfree;
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}
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/*
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* Pointer to an entry's tag word.
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*/
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__be16 *
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xfs_dir2_data_entry_tag_p(
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struct xfs_mount *mp,
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struct xfs_dir2_data_entry *dep)
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{
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return (__be16 *)((char *)dep +
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xfs_dir2_data_entsize(mp, dep->namelen) - sizeof(__be16));
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}
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uint8_t
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xfs_dir2_data_get_ftype(
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struct xfs_mount *mp,
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struct xfs_dir2_data_entry *dep)
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{
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if (xfs_has_ftype(mp)) {
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uint8_t ftype = dep->name[dep->namelen];
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if (likely(ftype < XFS_DIR3_FT_MAX))
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return ftype;
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}
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return XFS_DIR3_FT_UNKNOWN;
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}
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void
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xfs_dir2_data_put_ftype(
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struct xfs_mount *mp,
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struct xfs_dir2_data_entry *dep,
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uint8_t ftype)
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{
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ASSERT(ftype < XFS_DIR3_FT_MAX);
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ASSERT(dep->namelen != 0);
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if (xfs_has_ftype(mp))
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dep->name[dep->namelen] = ftype;
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}
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/*
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* The number of leaf entries is limited by the size of the block and the amount
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* of space used by the data entries. We don't know how much space is used by
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* the data entries yet, so just ensure that the count falls somewhere inside
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* the block right now.
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*/
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static inline unsigned int
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xfs_dir2_data_max_leaf_entries(
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struct xfs_da_geometry *geo)
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{
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return (geo->blksize - sizeof(struct xfs_dir2_block_tail) -
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geo->data_entry_offset) /
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sizeof(struct xfs_dir2_leaf_entry);
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}
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/*
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* Check the consistency of the data block.
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* The input can also be a block-format directory.
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* Return NULL if the buffer is good, otherwise the address of the error.
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*/
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xfs_failaddr_t
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__xfs_dir3_data_check(
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struct xfs_inode *dp, /* incore inode pointer */
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struct xfs_buf *bp) /* data block's buffer */
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{
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xfs_dir2_dataptr_t addr; /* addr for leaf lookup */
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xfs_dir2_data_free_t *bf; /* bestfree table */
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xfs_dir2_block_tail_t *btp=NULL; /* block tail */
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int count; /* count of entries found */
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xfs_dir2_data_hdr_t *hdr; /* data block header */
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xfs_dir2_data_free_t *dfp; /* bestfree entry */
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int freeseen; /* mask of bestfrees seen */
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xfs_dahash_t hash; /* hash of current name */
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int i; /* leaf index */
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int lastfree; /* last entry was unused */
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xfs_dir2_leaf_entry_t *lep=NULL; /* block leaf entries */
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struct xfs_mount *mp = bp->b_mount;
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int stale; /* count of stale leaves */
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struct xfs_name name;
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unsigned int offset;
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unsigned int end;
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struct xfs_da_geometry *geo = mp->m_dir_geo;
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/*
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* If this isn't a directory, something is seriously wrong. Bail out.
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*/
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if (dp && !S_ISDIR(VFS_I(dp)->i_mode))
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return __this_address;
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hdr = bp->b_addr;
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offset = geo->data_entry_offset;
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switch (hdr->magic) {
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case cpu_to_be32(XFS_DIR3_BLOCK_MAGIC):
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case cpu_to_be32(XFS_DIR2_BLOCK_MAGIC):
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btp = xfs_dir2_block_tail_p(geo, hdr);
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lep = xfs_dir2_block_leaf_p(btp);
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if (be32_to_cpu(btp->count) >=
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xfs_dir2_data_max_leaf_entries(geo))
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return __this_address;
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break;
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case cpu_to_be32(XFS_DIR3_DATA_MAGIC):
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case cpu_to_be32(XFS_DIR2_DATA_MAGIC):
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break;
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default:
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return __this_address;
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}
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end = xfs_dir3_data_end_offset(geo, hdr);
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if (!end)
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return __this_address;
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/*
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* Account for zero bestfree entries.
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*/
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bf = xfs_dir2_data_bestfree_p(mp, hdr);
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count = lastfree = freeseen = 0;
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if (!bf[0].length) {
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if (bf[0].offset)
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return __this_address;
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freeseen |= 1 << 0;
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}
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if (!bf[1].length) {
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if (bf[1].offset)
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return __this_address;
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freeseen |= 1 << 1;
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}
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if (!bf[2].length) {
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if (bf[2].offset)
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return __this_address;
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freeseen |= 1 << 2;
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}
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if (be16_to_cpu(bf[0].length) < be16_to_cpu(bf[1].length))
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return __this_address;
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if (be16_to_cpu(bf[1].length) < be16_to_cpu(bf[2].length))
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return __this_address;
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/*
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* Loop over the data/unused entries.
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*/
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while (offset < end) {
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struct xfs_dir2_data_unused *dup = bp->b_addr + offset;
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struct xfs_dir2_data_entry *dep = bp->b_addr + offset;
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/*
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* If it's unused, look for the space in the bestfree table.
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* If we find it, account for that, else make sure it
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* doesn't need to be there.
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*/
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if (be16_to_cpu(dup->freetag) == XFS_DIR2_DATA_FREE_TAG) {
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xfs_failaddr_t fa;
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if (lastfree != 0)
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return __this_address;
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if (offset + be16_to_cpu(dup->length) > end)
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return __this_address;
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if (be16_to_cpu(*xfs_dir2_data_unused_tag_p(dup)) !=
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offset)
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return __this_address;
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fa = xfs_dir2_data_freefind_verify(hdr, bf, dup, &dfp);
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if (fa)
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return fa;
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if (dfp) {
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i = (int)(dfp - bf);
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if ((freeseen & (1 << i)) != 0)
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return __this_address;
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freeseen |= 1 << i;
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} else {
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if (be16_to_cpu(dup->length) >
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be16_to_cpu(bf[2].length))
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return __this_address;
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}
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offset += be16_to_cpu(dup->length);
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lastfree = 1;
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continue;
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}
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/*
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* It's a real entry. Validate the fields.
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* If this is a block directory then make sure it's
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* in the leaf section of the block.
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* The linear search is crude but this is DEBUG code.
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*/
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if (dep->namelen == 0)
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return __this_address;
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if (!xfs_verify_dir_ino(mp, be64_to_cpu(dep->inumber)))
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return __this_address;
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if (offset + xfs_dir2_data_entsize(mp, dep->namelen) > end)
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return __this_address;
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if (be16_to_cpu(*xfs_dir2_data_entry_tag_p(mp, dep)) != offset)
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return __this_address;
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if (xfs_dir2_data_get_ftype(mp, dep) >= XFS_DIR3_FT_MAX)
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return __this_address;
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count++;
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lastfree = 0;
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if (hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC) ||
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hdr->magic == cpu_to_be32(XFS_DIR3_BLOCK_MAGIC)) {
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addr = xfs_dir2_db_off_to_dataptr(geo, geo->datablk,
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(xfs_dir2_data_aoff_t)
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((char *)dep - (char *)hdr));
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name.name = dep->name;
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name.len = dep->namelen;
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hash = xfs_dir2_hashname(mp, &name);
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for (i = 0; i < be32_to_cpu(btp->count); i++) {
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if (be32_to_cpu(lep[i].address) == addr &&
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be32_to_cpu(lep[i].hashval) == hash)
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break;
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}
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if (i >= be32_to_cpu(btp->count))
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return __this_address;
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}
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offset += xfs_dir2_data_entsize(mp, dep->namelen);
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}
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/*
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* Need to have seen all the entries and all the bestfree slots.
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*/
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if (freeseen != 7)
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return __this_address;
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if (hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC) ||
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hdr->magic == cpu_to_be32(XFS_DIR3_BLOCK_MAGIC)) {
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for (i = stale = 0; i < be32_to_cpu(btp->count); i++) {
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if (lep[i].address ==
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cpu_to_be32(XFS_DIR2_NULL_DATAPTR))
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stale++;
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if (i > 0 && be32_to_cpu(lep[i].hashval) <
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be32_to_cpu(lep[i - 1].hashval))
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return __this_address;
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}
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if (count != be32_to_cpu(btp->count) - be32_to_cpu(btp->stale))
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return __this_address;
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if (stale != be32_to_cpu(btp->stale))
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return __this_address;
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}
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return NULL;
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}
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#ifdef DEBUG
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void
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xfs_dir3_data_check(
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struct xfs_inode *dp,
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struct xfs_buf *bp)
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{
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xfs_failaddr_t fa;
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fa = __xfs_dir3_data_check(dp, bp);
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if (!fa)
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return;
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xfs_corruption_error(__func__, XFS_ERRLEVEL_LOW, dp->i_mount,
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bp->b_addr, BBTOB(bp->b_length), __FILE__, __LINE__,
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fa);
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ASSERT(0);
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}
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#endif
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static xfs_failaddr_t
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xfs_dir3_data_verify(
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struct xfs_buf *bp)
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{
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struct xfs_mount *mp = bp->b_mount;
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struct xfs_dir3_blk_hdr *hdr3 = bp->b_addr;
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if (!xfs_verify_magic(bp, hdr3->magic))
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return __this_address;
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if (xfs_has_crc(mp)) {
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if (!uuid_equal(&hdr3->uuid, &mp->m_sb.sb_meta_uuid))
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return __this_address;
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if (be64_to_cpu(hdr3->blkno) != xfs_buf_daddr(bp))
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return __this_address;
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if (!xfs_log_check_lsn(mp, be64_to_cpu(hdr3->lsn)))
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return __this_address;
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}
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return __xfs_dir3_data_check(NULL, bp);
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}
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/*
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* Readahead of the first block of the directory when it is opened is completely
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* oblivious to the format of the directory. Hence we can either get a block
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* format buffer or a data format buffer on readahead.
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*/
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static void
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xfs_dir3_data_reada_verify(
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struct xfs_buf *bp)
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{
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struct xfs_dir2_data_hdr *hdr = bp->b_addr;
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switch (hdr->magic) {
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case cpu_to_be32(XFS_DIR2_BLOCK_MAGIC):
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case cpu_to_be32(XFS_DIR3_BLOCK_MAGIC):
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bp->b_ops = &xfs_dir3_block_buf_ops;
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bp->b_ops->verify_read(bp);
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return;
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case cpu_to_be32(XFS_DIR2_DATA_MAGIC):
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case cpu_to_be32(XFS_DIR3_DATA_MAGIC):
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bp->b_ops = &xfs_dir3_data_buf_ops;
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bp->b_ops->verify_read(bp);
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return;
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default:
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xfs_verifier_error(bp, -EFSCORRUPTED, __this_address);
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break;
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}
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}
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static void
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xfs_dir3_data_read_verify(
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struct xfs_buf *bp)
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{
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struct xfs_mount *mp = bp->b_mount;
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xfs_failaddr_t fa;
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if (xfs_has_crc(mp) &&
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!xfs_buf_verify_cksum(bp, XFS_DIR3_DATA_CRC_OFF))
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xfs_verifier_error(bp, -EFSBADCRC, __this_address);
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else {
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fa = xfs_dir3_data_verify(bp);
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if (fa)
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xfs_verifier_error(bp, -EFSCORRUPTED, fa);
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}
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}
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static void
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xfs_dir3_data_write_verify(
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struct xfs_buf *bp)
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{
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struct xfs_mount *mp = bp->b_mount;
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struct xfs_buf_log_item *bip = bp->b_log_item;
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struct xfs_dir3_blk_hdr *hdr3 = bp->b_addr;
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xfs_failaddr_t fa;
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fa = xfs_dir3_data_verify(bp);
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if (fa) {
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xfs_verifier_error(bp, -EFSCORRUPTED, fa);
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return;
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}
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if (!xfs_has_crc(mp))
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return;
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if (bip)
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hdr3->lsn = cpu_to_be64(bip->bli_item.li_lsn);
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xfs_buf_update_cksum(bp, XFS_DIR3_DATA_CRC_OFF);
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}
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const struct xfs_buf_ops xfs_dir3_data_buf_ops = {
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.name = "xfs_dir3_data",
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.magic = { cpu_to_be32(XFS_DIR2_DATA_MAGIC),
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cpu_to_be32(XFS_DIR3_DATA_MAGIC) },
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.verify_read = xfs_dir3_data_read_verify,
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.verify_write = xfs_dir3_data_write_verify,
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.verify_struct = xfs_dir3_data_verify,
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};
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static const struct xfs_buf_ops xfs_dir3_data_reada_buf_ops = {
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.name = "xfs_dir3_data_reada",
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.magic = { cpu_to_be32(XFS_DIR2_DATA_MAGIC),
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cpu_to_be32(XFS_DIR3_DATA_MAGIC) },
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.verify_read = xfs_dir3_data_reada_verify,
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.verify_write = xfs_dir3_data_write_verify,
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};
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static xfs_failaddr_t
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xfs_dir3_data_header_check(
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struct xfs_inode *dp,
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struct xfs_buf *bp)
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{
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struct xfs_mount *mp = dp->i_mount;
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if (xfs_has_crc(mp)) {
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struct xfs_dir3_data_hdr *hdr3 = bp->b_addr;
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if (be64_to_cpu(hdr3->hdr.owner) != dp->i_ino)
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return __this_address;
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}
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return NULL;
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}
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int
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xfs_dir3_data_read(
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struct xfs_trans *tp,
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struct xfs_inode *dp,
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xfs_dablk_t bno,
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unsigned int flags,
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struct xfs_buf **bpp)
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{
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xfs_failaddr_t fa;
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int err;
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err = xfs_da_read_buf(tp, dp, bno, flags, bpp, XFS_DATA_FORK,
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&xfs_dir3_data_buf_ops);
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if (err || !*bpp)
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return err;
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/* Check things that we can't do in the verifier. */
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fa = xfs_dir3_data_header_check(dp, *bpp);
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if (fa) {
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__xfs_buf_mark_corrupt(*bpp, fa);
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xfs_trans_brelse(tp, *bpp);
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*bpp = NULL;
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return -EFSCORRUPTED;
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}
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xfs_trans_buf_set_type(tp, *bpp, XFS_BLFT_DIR_DATA_BUF);
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return err;
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}
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int
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xfs_dir3_data_readahead(
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struct xfs_inode *dp,
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xfs_dablk_t bno,
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unsigned int flags)
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{
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return xfs_da_reada_buf(dp, bno, flags, XFS_DATA_FORK,
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&xfs_dir3_data_reada_buf_ops);
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}
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/*
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* Find the bestfree entry that exactly coincides with unused directory space
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* or a verifier error because the bestfree data are bad.
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*/
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static xfs_failaddr_t
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xfs_dir2_data_freefind_verify(
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struct xfs_dir2_data_hdr *hdr,
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struct xfs_dir2_data_free *bf,
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struct xfs_dir2_data_unused *dup,
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struct xfs_dir2_data_free **bf_ent)
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{
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struct xfs_dir2_data_free *dfp;
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xfs_dir2_data_aoff_t off;
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bool matched = false;
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bool seenzero = false;
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|
|
|
*bf_ent = NULL;
|
|
off = (xfs_dir2_data_aoff_t)((char *)dup - (char *)hdr);
|
|
|
|
/*
|
|
* Validate some consistency in the bestfree table.
|
|
* Check order, non-overlapping entries, and if we find the
|
|
* one we're looking for it has to be exact.
|
|
*/
|
|
for (dfp = &bf[0]; dfp < &bf[XFS_DIR2_DATA_FD_COUNT]; dfp++) {
|
|
if (!dfp->offset) {
|
|
if (dfp->length)
|
|
return __this_address;
|
|
seenzero = true;
|
|
continue;
|
|
}
|
|
if (seenzero)
|
|
return __this_address;
|
|
if (be16_to_cpu(dfp->offset) == off) {
|
|
matched = true;
|
|
if (dfp->length != dup->length)
|
|
return __this_address;
|
|
} else if (be16_to_cpu(dfp->offset) > off) {
|
|
if (off + be16_to_cpu(dup->length) >
|
|
be16_to_cpu(dfp->offset))
|
|
return __this_address;
|
|
} else {
|
|
if (be16_to_cpu(dfp->offset) +
|
|
be16_to_cpu(dfp->length) > off)
|
|
return __this_address;
|
|
}
|
|
if (!matched &&
|
|
be16_to_cpu(dfp->length) < be16_to_cpu(dup->length))
|
|
return __this_address;
|
|
if (dfp > &bf[0] &&
|
|
be16_to_cpu(dfp[-1].length) < be16_to_cpu(dfp[0].length))
|
|
return __this_address;
|
|
}
|
|
|
|
/* Looks ok so far; now try to match up with a bestfree entry. */
|
|
*bf_ent = xfs_dir2_data_freefind(hdr, bf, dup);
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* Given a data block and an unused entry from that block,
|
|
* return the bestfree entry if any that corresponds to it.
|
|
*/
|
|
xfs_dir2_data_free_t *
|
|
xfs_dir2_data_freefind(
|
|
struct xfs_dir2_data_hdr *hdr, /* data block header */
|
|
struct xfs_dir2_data_free *bf, /* bestfree table pointer */
|
|
struct xfs_dir2_data_unused *dup) /* unused space */
|
|
{
|
|
xfs_dir2_data_free_t *dfp; /* bestfree entry */
|
|
xfs_dir2_data_aoff_t off; /* offset value needed */
|
|
|
|
off = (xfs_dir2_data_aoff_t)((char *)dup - (char *)hdr);
|
|
|
|
/*
|
|
* If this is smaller than the smallest bestfree entry,
|
|
* it can't be there since they're sorted.
|
|
*/
|
|
if (be16_to_cpu(dup->length) <
|
|
be16_to_cpu(bf[XFS_DIR2_DATA_FD_COUNT - 1].length))
|
|
return NULL;
|
|
/*
|
|
* Look at the three bestfree entries for our guy.
|
|
*/
|
|
for (dfp = &bf[0]; dfp < &bf[XFS_DIR2_DATA_FD_COUNT]; dfp++) {
|
|
if (!dfp->offset)
|
|
return NULL;
|
|
if (be16_to_cpu(dfp->offset) == off)
|
|
return dfp;
|
|
}
|
|
/*
|
|
* Didn't find it. This only happens if there are duplicate lengths.
|
|
*/
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* Insert an unused-space entry into the bestfree table.
|
|
*/
|
|
xfs_dir2_data_free_t * /* entry inserted */
|
|
xfs_dir2_data_freeinsert(
|
|
struct xfs_dir2_data_hdr *hdr, /* data block pointer */
|
|
struct xfs_dir2_data_free *dfp, /* bestfree table pointer */
|
|
struct xfs_dir2_data_unused *dup, /* unused space */
|
|
int *loghead) /* log the data header (out) */
|
|
{
|
|
xfs_dir2_data_free_t new; /* new bestfree entry */
|
|
|
|
ASSERT(hdr->magic == cpu_to_be32(XFS_DIR2_DATA_MAGIC) ||
|
|
hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC) ||
|
|
hdr->magic == cpu_to_be32(XFS_DIR3_DATA_MAGIC) ||
|
|
hdr->magic == cpu_to_be32(XFS_DIR3_BLOCK_MAGIC));
|
|
|
|
new.length = dup->length;
|
|
new.offset = cpu_to_be16((char *)dup - (char *)hdr);
|
|
|
|
/*
|
|
* Insert at position 0, 1, or 2; or not at all.
|
|
*/
|
|
if (be16_to_cpu(new.length) > be16_to_cpu(dfp[0].length)) {
|
|
dfp[2] = dfp[1];
|
|
dfp[1] = dfp[0];
|
|
dfp[0] = new;
|
|
*loghead = 1;
|
|
return &dfp[0];
|
|
}
|
|
if (be16_to_cpu(new.length) > be16_to_cpu(dfp[1].length)) {
|
|
dfp[2] = dfp[1];
|
|
dfp[1] = new;
|
|
*loghead = 1;
|
|
return &dfp[1];
|
|
}
|
|
if (be16_to_cpu(new.length) > be16_to_cpu(dfp[2].length)) {
|
|
dfp[2] = new;
|
|
*loghead = 1;
|
|
return &dfp[2];
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* Remove a bestfree entry from the table.
|
|
*/
|
|
STATIC void
|
|
xfs_dir2_data_freeremove(
|
|
struct xfs_dir2_data_hdr *hdr, /* data block header */
|
|
struct xfs_dir2_data_free *bf, /* bestfree table pointer */
|
|
struct xfs_dir2_data_free *dfp, /* bestfree entry pointer */
|
|
int *loghead) /* out: log data header */
|
|
{
|
|
|
|
ASSERT(hdr->magic == cpu_to_be32(XFS_DIR2_DATA_MAGIC) ||
|
|
hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC) ||
|
|
hdr->magic == cpu_to_be32(XFS_DIR3_DATA_MAGIC) ||
|
|
hdr->magic == cpu_to_be32(XFS_DIR3_BLOCK_MAGIC));
|
|
|
|
/*
|
|
* It's the first entry, slide the next 2 up.
|
|
*/
|
|
if (dfp == &bf[0]) {
|
|
bf[0] = bf[1];
|
|
bf[1] = bf[2];
|
|
}
|
|
/*
|
|
* It's the second entry, slide the 3rd entry up.
|
|
*/
|
|
else if (dfp == &bf[1])
|
|
bf[1] = bf[2];
|
|
/*
|
|
* Must be the last entry.
|
|
*/
|
|
else
|
|
ASSERT(dfp == &bf[2]);
|
|
/*
|
|
* Clear the 3rd entry, must be zero now.
|
|
*/
|
|
bf[2].length = 0;
|
|
bf[2].offset = 0;
|
|
*loghead = 1;
|
|
}
|
|
|
|
/*
|
|
* Given a data block, reconstruct its bestfree map.
|
|
*/
|
|
void
|
|
xfs_dir2_data_freescan(
|
|
struct xfs_mount *mp,
|
|
struct xfs_dir2_data_hdr *hdr,
|
|
int *loghead)
|
|
{
|
|
struct xfs_da_geometry *geo = mp->m_dir_geo;
|
|
struct xfs_dir2_data_free *bf = xfs_dir2_data_bestfree_p(mp, hdr);
|
|
void *addr = hdr;
|
|
unsigned int offset = geo->data_entry_offset;
|
|
unsigned int end;
|
|
|
|
ASSERT(hdr->magic == cpu_to_be32(XFS_DIR2_DATA_MAGIC) ||
|
|
hdr->magic == cpu_to_be32(XFS_DIR3_DATA_MAGIC) ||
|
|
hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC) ||
|
|
hdr->magic == cpu_to_be32(XFS_DIR3_BLOCK_MAGIC));
|
|
|
|
/*
|
|
* Start by clearing the table.
|
|
*/
|
|
memset(bf, 0, sizeof(*bf) * XFS_DIR2_DATA_FD_COUNT);
|
|
*loghead = 1;
|
|
|
|
end = xfs_dir3_data_end_offset(geo, addr);
|
|
while (offset < end) {
|
|
struct xfs_dir2_data_unused *dup = addr + offset;
|
|
struct xfs_dir2_data_entry *dep = addr + offset;
|
|
|
|
/*
|
|
* If it's a free entry, insert it.
|
|
*/
|
|
if (be16_to_cpu(dup->freetag) == XFS_DIR2_DATA_FREE_TAG) {
|
|
ASSERT(offset ==
|
|
be16_to_cpu(*xfs_dir2_data_unused_tag_p(dup)));
|
|
xfs_dir2_data_freeinsert(hdr, bf, dup, loghead);
|
|
offset += be16_to_cpu(dup->length);
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* For active entries, check their tags and skip them.
|
|
*/
|
|
ASSERT(offset ==
|
|
be16_to_cpu(*xfs_dir2_data_entry_tag_p(mp, dep)));
|
|
offset += xfs_dir2_data_entsize(mp, dep->namelen);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Initialize a data block at the given block number in the directory.
|
|
* Give back the buffer for the created block.
|
|
*/
|
|
int /* error */
|
|
xfs_dir3_data_init(
|
|
struct xfs_da_args *args, /* directory operation args */
|
|
xfs_dir2_db_t blkno, /* logical dir block number */
|
|
struct xfs_buf **bpp) /* output block buffer */
|
|
{
|
|
struct xfs_trans *tp = args->trans;
|
|
struct xfs_inode *dp = args->dp;
|
|
struct xfs_mount *mp = dp->i_mount;
|
|
struct xfs_da_geometry *geo = args->geo;
|
|
struct xfs_buf *bp;
|
|
struct xfs_dir2_data_hdr *hdr;
|
|
struct xfs_dir2_data_unused *dup;
|
|
struct xfs_dir2_data_free *bf;
|
|
int error;
|
|
int i;
|
|
|
|
/*
|
|
* Get the buffer set up for the block.
|
|
*/
|
|
error = xfs_da_get_buf(tp, dp, xfs_dir2_db_to_da(args->geo, blkno),
|
|
&bp, XFS_DATA_FORK);
|
|
if (error)
|
|
return error;
|
|
bp->b_ops = &xfs_dir3_data_buf_ops;
|
|
xfs_trans_buf_set_type(tp, bp, XFS_BLFT_DIR_DATA_BUF);
|
|
|
|
/*
|
|
* Initialize the header.
|
|
*/
|
|
hdr = bp->b_addr;
|
|
if (xfs_has_crc(mp)) {
|
|
struct xfs_dir3_blk_hdr *hdr3 = bp->b_addr;
|
|
|
|
memset(hdr3, 0, sizeof(*hdr3));
|
|
hdr3->magic = cpu_to_be32(XFS_DIR3_DATA_MAGIC);
|
|
hdr3->blkno = cpu_to_be64(xfs_buf_daddr(bp));
|
|
hdr3->owner = cpu_to_be64(dp->i_ino);
|
|
uuid_copy(&hdr3->uuid, &mp->m_sb.sb_meta_uuid);
|
|
|
|
} else
|
|
hdr->magic = cpu_to_be32(XFS_DIR2_DATA_MAGIC);
|
|
|
|
bf = xfs_dir2_data_bestfree_p(mp, hdr);
|
|
bf[0].offset = cpu_to_be16(geo->data_entry_offset);
|
|
bf[0].length = cpu_to_be16(geo->blksize - geo->data_entry_offset);
|
|
for (i = 1; i < XFS_DIR2_DATA_FD_COUNT; i++) {
|
|
bf[i].length = 0;
|
|
bf[i].offset = 0;
|
|
}
|
|
|
|
/*
|
|
* Set up an unused entry for the block's body.
|
|
*/
|
|
dup = bp->b_addr + geo->data_entry_offset;
|
|
dup->freetag = cpu_to_be16(XFS_DIR2_DATA_FREE_TAG);
|
|
dup->length = bf[0].length;
|
|
*xfs_dir2_data_unused_tag_p(dup) = cpu_to_be16((char *)dup - (char *)hdr);
|
|
|
|
/*
|
|
* Log it and return it.
|
|
*/
|
|
xfs_dir2_data_log_header(args, bp);
|
|
xfs_dir2_data_log_unused(args, bp, dup);
|
|
*bpp = bp;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Log an active data entry from the block.
|
|
*/
|
|
void
|
|
xfs_dir2_data_log_entry(
|
|
struct xfs_da_args *args,
|
|
struct xfs_buf *bp,
|
|
xfs_dir2_data_entry_t *dep) /* data entry pointer */
|
|
{
|
|
struct xfs_mount *mp = bp->b_mount;
|
|
struct xfs_dir2_data_hdr *hdr = bp->b_addr;
|
|
|
|
ASSERT(hdr->magic == cpu_to_be32(XFS_DIR2_DATA_MAGIC) ||
|
|
hdr->magic == cpu_to_be32(XFS_DIR3_DATA_MAGIC) ||
|
|
hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC) ||
|
|
hdr->magic == cpu_to_be32(XFS_DIR3_BLOCK_MAGIC));
|
|
|
|
xfs_trans_log_buf(args->trans, bp, (uint)((char *)dep - (char *)hdr),
|
|
(uint)((char *)(xfs_dir2_data_entry_tag_p(mp, dep) + 1) -
|
|
(char *)hdr - 1));
|
|
}
|
|
|
|
/*
|
|
* Log a data block header.
|
|
*/
|
|
void
|
|
xfs_dir2_data_log_header(
|
|
struct xfs_da_args *args,
|
|
struct xfs_buf *bp)
|
|
{
|
|
#ifdef DEBUG
|
|
struct xfs_dir2_data_hdr *hdr = bp->b_addr;
|
|
|
|
ASSERT(hdr->magic == cpu_to_be32(XFS_DIR2_DATA_MAGIC) ||
|
|
hdr->magic == cpu_to_be32(XFS_DIR3_DATA_MAGIC) ||
|
|
hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC) ||
|
|
hdr->magic == cpu_to_be32(XFS_DIR3_BLOCK_MAGIC));
|
|
#endif
|
|
|
|
xfs_trans_log_buf(args->trans, bp, 0, args->geo->data_entry_offset - 1);
|
|
}
|
|
|
|
/*
|
|
* Log a data unused entry.
|
|
*/
|
|
void
|
|
xfs_dir2_data_log_unused(
|
|
struct xfs_da_args *args,
|
|
struct xfs_buf *bp,
|
|
xfs_dir2_data_unused_t *dup) /* data unused pointer */
|
|
{
|
|
xfs_dir2_data_hdr_t *hdr = bp->b_addr;
|
|
|
|
ASSERT(hdr->magic == cpu_to_be32(XFS_DIR2_DATA_MAGIC) ||
|
|
hdr->magic == cpu_to_be32(XFS_DIR3_DATA_MAGIC) ||
|
|
hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC) ||
|
|
hdr->magic == cpu_to_be32(XFS_DIR3_BLOCK_MAGIC));
|
|
|
|
/*
|
|
* Log the first part of the unused entry.
|
|
*/
|
|
xfs_trans_log_buf(args->trans, bp, (uint)((char *)dup - (char *)hdr),
|
|
(uint)((char *)&dup->length + sizeof(dup->length) -
|
|
1 - (char *)hdr));
|
|
/*
|
|
* Log the end (tag) of the unused entry.
|
|
*/
|
|
xfs_trans_log_buf(args->trans, bp,
|
|
(uint)((char *)xfs_dir2_data_unused_tag_p(dup) - (char *)hdr),
|
|
(uint)((char *)xfs_dir2_data_unused_tag_p(dup) - (char *)hdr +
|
|
sizeof(xfs_dir2_data_off_t) - 1));
|
|
}
|
|
|
|
/*
|
|
* Make a byte range in the data block unused.
|
|
* Its current contents are unimportant.
|
|
*/
|
|
void
|
|
xfs_dir2_data_make_free(
|
|
struct xfs_da_args *args,
|
|
struct xfs_buf *bp,
|
|
xfs_dir2_data_aoff_t offset, /* starting byte offset */
|
|
xfs_dir2_data_aoff_t len, /* length in bytes */
|
|
int *needlogp, /* out: log header */
|
|
int *needscanp) /* out: regen bestfree */
|
|
{
|
|
xfs_dir2_data_hdr_t *hdr; /* data block pointer */
|
|
xfs_dir2_data_free_t *dfp; /* bestfree pointer */
|
|
int needscan; /* need to regen bestfree */
|
|
xfs_dir2_data_unused_t *newdup; /* new unused entry */
|
|
xfs_dir2_data_unused_t *postdup; /* unused entry after us */
|
|
xfs_dir2_data_unused_t *prevdup; /* unused entry before us */
|
|
unsigned int end;
|
|
struct xfs_dir2_data_free *bf;
|
|
|
|
hdr = bp->b_addr;
|
|
|
|
/*
|
|
* Figure out where the end of the data area is.
|
|
*/
|
|
end = xfs_dir3_data_end_offset(args->geo, hdr);
|
|
ASSERT(end != 0);
|
|
|
|
/*
|
|
* If this isn't the start of the block, then back up to
|
|
* the previous entry and see if it's free.
|
|
*/
|
|
if (offset > args->geo->data_entry_offset) {
|
|
__be16 *tagp; /* tag just before us */
|
|
|
|
tagp = (__be16 *)((char *)hdr + offset) - 1;
|
|
prevdup = (xfs_dir2_data_unused_t *)((char *)hdr + be16_to_cpu(*tagp));
|
|
if (be16_to_cpu(prevdup->freetag) != XFS_DIR2_DATA_FREE_TAG)
|
|
prevdup = NULL;
|
|
} else
|
|
prevdup = NULL;
|
|
/*
|
|
* If this isn't the end of the block, see if the entry after
|
|
* us is free.
|
|
*/
|
|
if (offset + len < end) {
|
|
postdup =
|
|
(xfs_dir2_data_unused_t *)((char *)hdr + offset + len);
|
|
if (be16_to_cpu(postdup->freetag) != XFS_DIR2_DATA_FREE_TAG)
|
|
postdup = NULL;
|
|
} else
|
|
postdup = NULL;
|
|
ASSERT(*needscanp == 0);
|
|
needscan = 0;
|
|
/*
|
|
* Previous and following entries are both free,
|
|
* merge everything into a single free entry.
|
|
*/
|
|
bf = xfs_dir2_data_bestfree_p(args->dp->i_mount, hdr);
|
|
if (prevdup && postdup) {
|
|
xfs_dir2_data_free_t *dfp2; /* another bestfree pointer */
|
|
|
|
/*
|
|
* See if prevdup and/or postdup are in bestfree table.
|
|
*/
|
|
dfp = xfs_dir2_data_freefind(hdr, bf, prevdup);
|
|
dfp2 = xfs_dir2_data_freefind(hdr, bf, postdup);
|
|
/*
|
|
* We need a rescan unless there are exactly 2 free entries
|
|
* namely our two. Then we know what's happening, otherwise
|
|
* since the third bestfree is there, there might be more
|
|
* entries.
|
|
*/
|
|
needscan = (bf[2].length != 0);
|
|
/*
|
|
* Fix up the new big freespace.
|
|
*/
|
|
be16_add_cpu(&prevdup->length, len + be16_to_cpu(postdup->length));
|
|
*xfs_dir2_data_unused_tag_p(prevdup) =
|
|
cpu_to_be16((char *)prevdup - (char *)hdr);
|
|
xfs_dir2_data_log_unused(args, bp, prevdup);
|
|
if (!needscan) {
|
|
/*
|
|
* Has to be the case that entries 0 and 1 are
|
|
* dfp and dfp2 (don't know which is which), and
|
|
* entry 2 is empty.
|
|
* Remove entry 1 first then entry 0.
|
|
*/
|
|
ASSERT(dfp && dfp2);
|
|
if (dfp == &bf[1]) {
|
|
dfp = &bf[0];
|
|
ASSERT(dfp2 == dfp);
|
|
dfp2 = &bf[1];
|
|
}
|
|
xfs_dir2_data_freeremove(hdr, bf, dfp2, needlogp);
|
|
xfs_dir2_data_freeremove(hdr, bf, dfp, needlogp);
|
|
/*
|
|
* Now insert the new entry.
|
|
*/
|
|
dfp = xfs_dir2_data_freeinsert(hdr, bf, prevdup,
|
|
needlogp);
|
|
ASSERT(dfp == &bf[0]);
|
|
ASSERT(dfp->length == prevdup->length);
|
|
ASSERT(!dfp[1].length);
|
|
ASSERT(!dfp[2].length);
|
|
}
|
|
}
|
|
/*
|
|
* The entry before us is free, merge with it.
|
|
*/
|
|
else if (prevdup) {
|
|
dfp = xfs_dir2_data_freefind(hdr, bf, prevdup);
|
|
be16_add_cpu(&prevdup->length, len);
|
|
*xfs_dir2_data_unused_tag_p(prevdup) =
|
|
cpu_to_be16((char *)prevdup - (char *)hdr);
|
|
xfs_dir2_data_log_unused(args, bp, prevdup);
|
|
/*
|
|
* If the previous entry was in the table, the new entry
|
|
* is longer, so it will be in the table too. Remove
|
|
* the old one and add the new one.
|
|
*/
|
|
if (dfp) {
|
|
xfs_dir2_data_freeremove(hdr, bf, dfp, needlogp);
|
|
xfs_dir2_data_freeinsert(hdr, bf, prevdup, needlogp);
|
|
}
|
|
/*
|
|
* Otherwise we need a scan if the new entry is big enough.
|
|
*/
|
|
else {
|
|
needscan = be16_to_cpu(prevdup->length) >
|
|
be16_to_cpu(bf[2].length);
|
|
}
|
|
}
|
|
/*
|
|
* The following entry is free, merge with it.
|
|
*/
|
|
else if (postdup) {
|
|
dfp = xfs_dir2_data_freefind(hdr, bf, postdup);
|
|
newdup = (xfs_dir2_data_unused_t *)((char *)hdr + offset);
|
|
newdup->freetag = cpu_to_be16(XFS_DIR2_DATA_FREE_TAG);
|
|
newdup->length = cpu_to_be16(len + be16_to_cpu(postdup->length));
|
|
*xfs_dir2_data_unused_tag_p(newdup) =
|
|
cpu_to_be16((char *)newdup - (char *)hdr);
|
|
xfs_dir2_data_log_unused(args, bp, newdup);
|
|
/*
|
|
* If the following entry was in the table, the new entry
|
|
* is longer, so it will be in the table too. Remove
|
|
* the old one and add the new one.
|
|
*/
|
|
if (dfp) {
|
|
xfs_dir2_data_freeremove(hdr, bf, dfp, needlogp);
|
|
xfs_dir2_data_freeinsert(hdr, bf, newdup, needlogp);
|
|
}
|
|
/*
|
|
* Otherwise we need a scan if the new entry is big enough.
|
|
*/
|
|
else {
|
|
needscan = be16_to_cpu(newdup->length) >
|
|
be16_to_cpu(bf[2].length);
|
|
}
|
|
}
|
|
/*
|
|
* Neither neighbor is free. Make a new entry.
|
|
*/
|
|
else {
|
|
newdup = (xfs_dir2_data_unused_t *)((char *)hdr + offset);
|
|
newdup->freetag = cpu_to_be16(XFS_DIR2_DATA_FREE_TAG);
|
|
newdup->length = cpu_to_be16(len);
|
|
*xfs_dir2_data_unused_tag_p(newdup) =
|
|
cpu_to_be16((char *)newdup - (char *)hdr);
|
|
xfs_dir2_data_log_unused(args, bp, newdup);
|
|
xfs_dir2_data_freeinsert(hdr, bf, newdup, needlogp);
|
|
}
|
|
*needscanp = needscan;
|
|
}
|
|
|
|
/* Check our free data for obvious signs of corruption. */
|
|
static inline xfs_failaddr_t
|
|
xfs_dir2_data_check_free(
|
|
struct xfs_dir2_data_hdr *hdr,
|
|
struct xfs_dir2_data_unused *dup,
|
|
xfs_dir2_data_aoff_t offset,
|
|
xfs_dir2_data_aoff_t len)
|
|
{
|
|
if (hdr->magic != cpu_to_be32(XFS_DIR2_DATA_MAGIC) &&
|
|
hdr->magic != cpu_to_be32(XFS_DIR3_DATA_MAGIC) &&
|
|
hdr->magic != cpu_to_be32(XFS_DIR2_BLOCK_MAGIC) &&
|
|
hdr->magic != cpu_to_be32(XFS_DIR3_BLOCK_MAGIC))
|
|
return __this_address;
|
|
if (be16_to_cpu(dup->freetag) != XFS_DIR2_DATA_FREE_TAG)
|
|
return __this_address;
|
|
if (offset < (char *)dup - (char *)hdr)
|
|
return __this_address;
|
|
if (offset + len > (char *)dup + be16_to_cpu(dup->length) - (char *)hdr)
|
|
return __this_address;
|
|
if ((char *)dup - (char *)hdr !=
|
|
be16_to_cpu(*xfs_dir2_data_unused_tag_p(dup)))
|
|
return __this_address;
|
|
return NULL;
|
|
}
|
|
|
|
/* Sanity-check a new bestfree entry. */
|
|
static inline xfs_failaddr_t
|
|
xfs_dir2_data_check_new_free(
|
|
struct xfs_dir2_data_hdr *hdr,
|
|
struct xfs_dir2_data_free *dfp,
|
|
struct xfs_dir2_data_unused *newdup)
|
|
{
|
|
if (dfp == NULL)
|
|
return __this_address;
|
|
if (dfp->length != newdup->length)
|
|
return __this_address;
|
|
if (be16_to_cpu(dfp->offset) != (char *)newdup - (char *)hdr)
|
|
return __this_address;
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* Take a byte range out of an existing unused space and make it un-free.
|
|
*/
|
|
int
|
|
xfs_dir2_data_use_free(
|
|
struct xfs_da_args *args,
|
|
struct xfs_buf *bp,
|
|
xfs_dir2_data_unused_t *dup, /* unused entry */
|
|
xfs_dir2_data_aoff_t offset, /* starting offset to use */
|
|
xfs_dir2_data_aoff_t len, /* length to use */
|
|
int *needlogp, /* out: need to log header */
|
|
int *needscanp) /* out: need regen bestfree */
|
|
{
|
|
xfs_dir2_data_hdr_t *hdr; /* data block header */
|
|
xfs_dir2_data_free_t *dfp; /* bestfree pointer */
|
|
xfs_dir2_data_unused_t *newdup; /* new unused entry */
|
|
xfs_dir2_data_unused_t *newdup2; /* another new unused entry */
|
|
struct xfs_dir2_data_free *bf;
|
|
xfs_failaddr_t fa;
|
|
int matchback; /* matches end of freespace */
|
|
int matchfront; /* matches start of freespace */
|
|
int needscan; /* need to regen bestfree */
|
|
int oldlen; /* old unused entry's length */
|
|
|
|
hdr = bp->b_addr;
|
|
fa = xfs_dir2_data_check_free(hdr, dup, offset, len);
|
|
if (fa)
|
|
goto corrupt;
|
|
/*
|
|
* Look up the entry in the bestfree table.
|
|
*/
|
|
oldlen = be16_to_cpu(dup->length);
|
|
bf = xfs_dir2_data_bestfree_p(args->dp->i_mount, hdr);
|
|
dfp = xfs_dir2_data_freefind(hdr, bf, dup);
|
|
ASSERT(dfp || oldlen <= be16_to_cpu(bf[2].length));
|
|
/*
|
|
* Check for alignment with front and back of the entry.
|
|
*/
|
|
matchfront = (char *)dup - (char *)hdr == offset;
|
|
matchback = (char *)dup + oldlen - (char *)hdr == offset + len;
|
|
ASSERT(*needscanp == 0);
|
|
needscan = 0;
|
|
/*
|
|
* If we matched it exactly we just need to get rid of it from
|
|
* the bestfree table.
|
|
*/
|
|
if (matchfront && matchback) {
|
|
if (dfp) {
|
|
needscan = (bf[2].offset != 0);
|
|
if (!needscan)
|
|
xfs_dir2_data_freeremove(hdr, bf, dfp,
|
|
needlogp);
|
|
}
|
|
}
|
|
/*
|
|
* We match the first part of the entry.
|
|
* Make a new entry with the remaining freespace.
|
|
*/
|
|
else if (matchfront) {
|
|
newdup = (xfs_dir2_data_unused_t *)((char *)hdr + offset + len);
|
|
newdup->freetag = cpu_to_be16(XFS_DIR2_DATA_FREE_TAG);
|
|
newdup->length = cpu_to_be16(oldlen - len);
|
|
*xfs_dir2_data_unused_tag_p(newdup) =
|
|
cpu_to_be16((char *)newdup - (char *)hdr);
|
|
xfs_dir2_data_log_unused(args, bp, newdup);
|
|
/*
|
|
* If it was in the table, remove it and add the new one.
|
|
*/
|
|
if (dfp) {
|
|
xfs_dir2_data_freeremove(hdr, bf, dfp, needlogp);
|
|
dfp = xfs_dir2_data_freeinsert(hdr, bf, newdup,
|
|
needlogp);
|
|
fa = xfs_dir2_data_check_new_free(hdr, dfp, newdup);
|
|
if (fa)
|
|
goto corrupt;
|
|
/*
|
|
* If we got inserted at the last slot,
|
|
* that means we don't know if there was a better
|
|
* choice for the last slot, or not. Rescan.
|
|
*/
|
|
needscan = dfp == &bf[2];
|
|
}
|
|
}
|
|
/*
|
|
* We match the last part of the entry.
|
|
* Trim the allocated space off the tail of the entry.
|
|
*/
|
|
else if (matchback) {
|
|
newdup = dup;
|
|
newdup->length = cpu_to_be16(((char *)hdr + offset) - (char *)newdup);
|
|
*xfs_dir2_data_unused_tag_p(newdup) =
|
|
cpu_to_be16((char *)newdup - (char *)hdr);
|
|
xfs_dir2_data_log_unused(args, bp, newdup);
|
|
/*
|
|
* If it was in the table, remove it and add the new one.
|
|
*/
|
|
if (dfp) {
|
|
xfs_dir2_data_freeremove(hdr, bf, dfp, needlogp);
|
|
dfp = xfs_dir2_data_freeinsert(hdr, bf, newdup,
|
|
needlogp);
|
|
fa = xfs_dir2_data_check_new_free(hdr, dfp, newdup);
|
|
if (fa)
|
|
goto corrupt;
|
|
/*
|
|
* If we got inserted at the last slot,
|
|
* that means we don't know if there was a better
|
|
* choice for the last slot, or not. Rescan.
|
|
*/
|
|
needscan = dfp == &bf[2];
|
|
}
|
|
}
|
|
/*
|
|
* Poking out the middle of an entry.
|
|
* Make two new entries.
|
|
*/
|
|
else {
|
|
newdup = dup;
|
|
newdup->length = cpu_to_be16(((char *)hdr + offset) - (char *)newdup);
|
|
*xfs_dir2_data_unused_tag_p(newdup) =
|
|
cpu_to_be16((char *)newdup - (char *)hdr);
|
|
xfs_dir2_data_log_unused(args, bp, newdup);
|
|
newdup2 = (xfs_dir2_data_unused_t *)((char *)hdr + offset + len);
|
|
newdup2->freetag = cpu_to_be16(XFS_DIR2_DATA_FREE_TAG);
|
|
newdup2->length = cpu_to_be16(oldlen - len - be16_to_cpu(newdup->length));
|
|
*xfs_dir2_data_unused_tag_p(newdup2) =
|
|
cpu_to_be16((char *)newdup2 - (char *)hdr);
|
|
xfs_dir2_data_log_unused(args, bp, newdup2);
|
|
/*
|
|
* If the old entry was in the table, we need to scan
|
|
* if the 3rd entry was valid, since these entries
|
|
* are smaller than the old one.
|
|
* If we don't need to scan that means there were 1 or 2
|
|
* entries in the table, and removing the old and adding
|
|
* the 2 new will work.
|
|
*/
|
|
if (dfp) {
|
|
needscan = (bf[2].length != 0);
|
|
if (!needscan) {
|
|
xfs_dir2_data_freeremove(hdr, bf, dfp,
|
|
needlogp);
|
|
xfs_dir2_data_freeinsert(hdr, bf, newdup,
|
|
needlogp);
|
|
xfs_dir2_data_freeinsert(hdr, bf, newdup2,
|
|
needlogp);
|
|
}
|
|
}
|
|
}
|
|
*needscanp = needscan;
|
|
return 0;
|
|
corrupt:
|
|
xfs_corruption_error(__func__, XFS_ERRLEVEL_LOW, args->dp->i_mount,
|
|
hdr, sizeof(*hdr), __FILE__, __LINE__, fa);
|
|
return -EFSCORRUPTED;
|
|
}
|
|
|
|
/* Find the end of the entry data in a data/block format dir block. */
|
|
unsigned int
|
|
xfs_dir3_data_end_offset(
|
|
struct xfs_da_geometry *geo,
|
|
struct xfs_dir2_data_hdr *hdr)
|
|
{
|
|
void *p;
|
|
|
|
switch (hdr->magic) {
|
|
case cpu_to_be32(XFS_DIR3_BLOCK_MAGIC):
|
|
case cpu_to_be32(XFS_DIR2_BLOCK_MAGIC):
|
|
p = xfs_dir2_block_leaf_p(xfs_dir2_block_tail_p(geo, hdr));
|
|
return p - (void *)hdr;
|
|
case cpu_to_be32(XFS_DIR3_DATA_MAGIC):
|
|
case cpu_to_be32(XFS_DIR2_DATA_MAGIC):
|
|
return geo->blksize;
|
|
default:
|
|
return 0;
|
|
}
|
|
}
|