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xfs: factor dir2 block read operations

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In preparation for verifying dir2 block format buffers, factor
the read operations out of the block operations (lookup, addname,
getdents) and some of the additional logic to make it easier to
understand an dmodify the code.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Ben Myers <bpm@sgi.com>
Signed-off-by: Ben Myers <bpm@sgi.com>
This commit is contained in:
Dave Chinner 2012-11-12 22:54:11 +11:00 committed by Ben Myers
parent 4bb20a83a2
commit 20f7e9f372
1 changed files with 209 additions and 177 deletions
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386
fs/xfs/xfs_dir2_block.c
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@ -56,6 +56,178 @@ xfs_dir_startup(void)
xfs_dir_hash_dotdot = xfs_da_hashname((unsigned char *)"..", 2);
}
static int
xfs_dir2_block_read(
struct xfs_trans *tp,
struct xfs_inode *dp,
struct xfs_buf **bpp)
{
struct xfs_mount *mp = dp->i_mount;
return xfs_da_read_buf(tp, dp, mp->m_dirdatablk, -1, bpp,
XFS_DATA_FORK, NULL);
}
static void
xfs_dir2_block_need_space(
struct xfs_dir2_data_hdr *hdr,
struct xfs_dir2_block_tail *btp,
struct xfs_dir2_leaf_entry *blp,
__be16 **tagpp,
struct xfs_dir2_data_unused **dupp,
struct xfs_dir2_data_unused **enddupp,
int *compact,
int len)
{
struct xfs_dir2_data_free *bf;
__be16 *tagp = NULL;
struct xfs_dir2_data_unused *dup = NULL;
struct xfs_dir2_data_unused *enddup = NULL;
*compact = 0;
bf = hdr->bestfree;
/*
* If there are stale entries we'll use one for the leaf.
*/
if (btp->stale) {
if (be16_to_cpu(bf[0].length) >= len) {
/*
* The biggest entry enough to avoid compaction.
*/
dup = (xfs_dir2_data_unused_t *)
((char *)hdr + be16_to_cpu(bf[0].offset));
goto out;
}
/*
* Will need to compact to make this work.
* Tag just before the first leaf entry.
*/
*compact = 1;
tagp = (__be16 *)blp - 1;
/* Data object just before the first leaf entry. */
dup = (xfs_dir2_data_unused_t *)((char *)hdr + be16_to_cpu(*tagp));
/*
* If it's not free then the data will go where the
* leaf data starts now, if it works at all.
*/
if (be16_to_cpu(dup->freetag) == XFS_DIR2_DATA_FREE_TAG) {
if (be16_to_cpu(dup->length) + (be32_to_cpu(btp->stale) - 1) *
(uint)sizeof(*blp) < len)
dup = NULL;
} else if ((be32_to_cpu(btp->stale) - 1) * (uint)sizeof(*blp) < len)
dup = NULL;
else
dup = (xfs_dir2_data_unused_t *)blp;
goto out;
}
/*
* no stale entries, so just use free space.
* Tag just before the first leaf entry.
*/
tagp = (__be16 *)blp - 1;
/* Data object just before the first leaf entry. */
enddup = (xfs_dir2_data_unused_t *)((char *)hdr + be16_to_cpu(*tagp));
/*
* If it's not free then can't do this add without cleaning up:
* the space before the first leaf entry needs to be free so it
* can be expanded to hold the pointer to the new entry.
*/
if (be16_to_cpu(enddup->freetag) == XFS_DIR2_DATA_FREE_TAG) {
/*
* Check out the biggest freespace and see if it's the same one.
*/
dup = (xfs_dir2_data_unused_t *)
((char *)hdr + be16_to_cpu(bf[0].offset));
if (dup != enddup) {
/*
* Not the same free entry, just check its length.
*/
if (be16_to_cpu(dup->length) < len)
dup = NULL;
goto out;
}
/*
* It is the biggest freespace, can it hold the leaf too?
*/
if (be16_to_cpu(dup->length) < len + (uint)sizeof(*blp)) {
/*
* Yes, use the second-largest entry instead if it works.
*/
if (be16_to_cpu(bf[1].length) >= len)
dup = (xfs_dir2_data_unused_t *)
((char *)hdr + be16_to_cpu(bf[1].offset));
else
dup = NULL;
}
}
out:
*tagpp = tagp;
*dupp = dup;
*enddupp = enddup;
}
/*
* compact the leaf entries.
* Leave the highest-numbered stale entry stale.
* XXX should be the one closest to mid but mid is not yet computed.
*/
static void
xfs_dir2_block_compact(
struct xfs_trans *tp,
struct xfs_buf *bp,
struct xfs_dir2_data_hdr *hdr,
struct xfs_dir2_block_tail *btp,
struct xfs_dir2_leaf_entry *blp,
int *needlog,
int *lfloghigh,
int *lfloglow)
{
int fromidx; /* source leaf index */
int toidx; /* target leaf index */
int needscan = 0;
int highstale; /* high stale index */
fromidx = toidx = be32_to_cpu(btp->count) - 1;
highstale = *lfloghigh = -1;
for (; fromidx >= 0; fromidx--) {
if (blp[fromidx].address == cpu_to_be32(XFS_DIR2_NULL_DATAPTR)) {
if (highstale == -1)
highstale = toidx;
else {
if (*lfloghigh == -1)
*lfloghigh = toidx;
continue;
}
}
if (fromidx < toidx)
blp[toidx] = blp[fromidx];
toidx--;
}
*lfloglow = toidx + 1 - (be32_to_cpu(btp->stale) - 1);
*lfloghigh -= be32_to_cpu(btp->stale) - 1;
be32_add_cpu(&btp->count, -(be32_to_cpu(btp->stale) - 1));
xfs_dir2_data_make_free(tp, bp,
(xfs_dir2_data_aoff_t)((char *)blp - (char *)hdr),
(xfs_dir2_data_aoff_t)((be32_to_cpu(btp->stale) - 1) * sizeof(*blp)),
needlog, &needscan);
blp += be32_to_cpu(btp->stale) - 1;
btp->stale = cpu_to_be32(1);
/*
* If we now need to rebuild the bestfree map, do so.
* This needs to happen before the next call to use_free.
*/
if (needscan)
xfs_dir2_data_freescan(tp->t_mountp, hdr, needlog);
}
/*
* Add an entry to a block directory.
*/
@ -63,7 +235,6 @@ int /* error */
xfs_dir2_block_addname(
xfs_da_args_t *args) /* directory op arguments */
{
xfs_dir2_data_free_t *bf; /* bestfree table in block */
xfs_dir2_data_hdr_t *hdr; /* block header */
xfs_dir2_leaf_entry_t *blp; /* block leaf entries */
struct xfs_buf *bp; /* buffer for block */
@ -94,134 +265,44 @@ xfs_dir2_block_addname(
dp = args->dp;
tp = args->trans;
mp = dp->i_mount;
/*
* Read the (one and only) directory block into dabuf bp.
*/
error = xfs_da_read_buf(tp, dp, mp->m_dirdatablk, -1, &bp,
XFS_DATA_FORK, NULL);
/* Read the (one and only) directory block into bp. */
error = xfs_dir2_block_read(tp, dp, &bp);
if (error)
return error;
ASSERT(bp != NULL);
hdr = bp->b_addr;
/*
* Check the magic number, corrupted if wrong.
*/
if (unlikely(hdr->magic != cpu_to_be32(XFS_DIR2_BLOCK_MAGIC))) {
XFS_CORRUPTION_ERROR("xfs_dir2_block_addname",
XFS_ERRLEVEL_LOW, mp, hdr);
xfs_trans_brelse(tp, bp);
return XFS_ERROR(EFSCORRUPTED);
}
len = xfs_dir2_data_entsize(args->namelen);
/*
* Set up pointers to parts of the block.
*/
bf = hdr->bestfree;
hdr = bp->b_addr;
btp = xfs_dir2_block_tail_p(mp, hdr);
blp = xfs_dir2_block_leaf_p(btp);
/*
* No stale entries? Need space for entry and new leaf.
* Find out if we can reuse stale entries or whether we need extra
* space for entry and new leaf.
*/
if (!btp->stale) {
/*
* Tag just before the first leaf entry.
*/
tagp = (__be16 *)blp - 1;
/*
* Data object just before the first leaf entry.
*/
enddup = (xfs_dir2_data_unused_t *)((char *)hdr + be16_to_cpu(*tagp));
/*
* If it's not free then can't do this add without cleaning up:
* the space before the first leaf entry needs to be free so it
* can be expanded to hold the pointer to the new entry.
*/
if (be16_to_cpu(enddup->freetag) != XFS_DIR2_DATA_FREE_TAG)
dup = enddup = NULL;
/*
* Check out the biggest freespace and see if it's the same one.
*/
else {
dup = (xfs_dir2_data_unused_t *)
((char *)hdr + be16_to_cpu(bf[0].offset));
if (dup == enddup) {
/*
* It is the biggest freespace, is it too small
* to hold the new leaf too?
*/
if (be16_to_cpu(dup->length) < len + (uint)sizeof(*blp)) {
/*
* Yes, we use the second-largest
* entry instead if it works.
*/
if (be16_to_cpu(bf[1].length) >= len)
dup = (xfs_dir2_data_unused_t *)
((char *)hdr +
be16_to_cpu(bf[1].offset));
else
dup = NULL;
}
} else {
/*
* Not the same free entry,
* just check its length.
*/
if (be16_to_cpu(dup->length) < len) {
dup = NULL;
}
}
}
compact = 0;
}
xfs_dir2_block_need_space(hdr, btp, blp, &tagp, &dup,
&enddup, &compact, len);
/*
* If there are stale entries we'll use one for the leaf.
* Is the biggest entry enough to avoid compaction?
* Done everything we need for a space check now.
*/
else if (be16_to_cpu(bf[0].length) >= len) {
dup = (xfs_dir2_data_unused_t *)
((char *)hdr + be16_to_cpu(bf[0].offset));
compact = 0;
}
/*
* Will need to compact to make this work.
*/
else {
/*
* Tag just before the first leaf entry.
*/
tagp = (__be16 *)blp - 1;
/*
* Data object just before the first leaf entry.
*/
dup = (xfs_dir2_data_unused_t *)((char *)hdr + be16_to_cpu(*tagp));
/*
* If it's not free then the data will go where the
* leaf data starts now, if it works at all.
*/
if (be16_to_cpu(dup->freetag) == XFS_DIR2_DATA_FREE_TAG) {
if (be16_to_cpu(dup->length) + (be32_to_cpu(btp->stale) - 1) *
(uint)sizeof(*blp) < len)
dup = NULL;
} else if ((be32_to_cpu(btp->stale) - 1) * (uint)sizeof(*blp) < len)
dup = NULL;
else
dup = (xfs_dir2_data_unused_t *)blp;
compact = 1;
}
/*
* If this isn't a real add, we're done with the buffer.
*/
if (args->op_flags & XFS_DA_OP_JUSTCHECK)
if (args->op_flags & XFS_DA_OP_JUSTCHECK) {
xfs_trans_brelse(tp, bp);
if (!dup)
return XFS_ERROR(ENOSPC);
return 0;
}
/*
* If we don't have space for the new entry & leaf ...
*/
if (!dup) {
/*
* Not trying to actually do anything, or don't have
* a space reservation: return no-space.
*/
if ((args->op_flags & XFS_DA_OP_JUSTCHECK) || args->total == 0)
/* Don't have a space reservation: return no-space. */
if (args->total == 0)
return XFS_ERROR(ENOSPC);
/*
* Convert to the next larger format.
@ -232,65 +313,24 @@ xfs_dir2_block_addname(
return error;
return xfs_dir2_leaf_addname(args);
}
/*
* Just checking, and it would work, so say so.
*/
if (args->op_flags & XFS_DA_OP_JUSTCHECK)
return 0;
needlog = needscan = 0;
/*
* If need to compact the leaf entries, do it now.
* Leave the highest-numbered stale entry stale.
* XXX should be the one closest to mid but mid is not yet computed.
*/
if (compact) {
int fromidx; /* source leaf index */
int toidx; /* target leaf index */
for (fromidx = toidx = be32_to_cpu(btp->count) - 1,
highstale = lfloghigh = -1;
fromidx >= 0;
fromidx--) {
if (blp[fromidx].address ==
cpu_to_be32(XFS_DIR2_NULL_DATAPTR)) {
if (highstale == -1)
highstale = toidx;
else {
if (lfloghigh == -1)
lfloghigh = toidx;
continue;
}
}
if (fromidx < toidx)
blp[toidx] = blp[fromidx];
toidx--;
}
lfloglow = toidx + 1 - (be32_to_cpu(btp->stale) - 1);
lfloghigh -= be32_to_cpu(btp->stale) - 1;
be32_add_cpu(&btp->count, -(be32_to_cpu(btp->stale) - 1));
xfs_dir2_data_make_free(tp, bp,
(xfs_dir2_data_aoff_t)((char *)blp - (char *)hdr),
(xfs_dir2_data_aoff_t)((be32_to_cpu(btp->stale) - 1) * sizeof(*blp)),
&needlog, &needscan);
blp += be32_to_cpu(btp->stale) - 1;
btp->stale = cpu_to_be32(1);
/*
* If we now need to rebuild the bestfree map, do so.
* This needs to happen before the next call to use_free.
*/
if (needscan) {
xfs_dir2_data_freescan(mp, hdr, &needlog);
needscan = 0;
}
}
/*
* Set leaf logging boundaries to impossible state.
* For the no-stale case they're set explicitly.
*/
if (compact)
xfs_dir2_block_compact(tp, bp, hdr, btp, blp, &needlog,
&lfloghigh, &lfloglow);
else if (btp->stale) {
/*
* Set leaf logging boundaries to impossible state.
* For the no-stale case they're set explicitly.
*/
lfloglow = be32_to_cpu(btp->count);
lfloghigh = -1;
}
/*
* Find the slot that's first lower than our hash value, -1 if none.
*/
@ -450,18 +490,13 @@ xfs_dir2_block_getdents(
/*
* If the block number in the offset is out of range, we're done.
*/
if (xfs_dir2_dataptr_to_db(mp, *offset) > mp->m_dirdatablk) {
if (xfs_dir2_dataptr_to_db(mp, *offset) > mp->m_dirdatablk)
return 0;
}
/*
* Can't read the block, give up, else get dabuf in bp.
*/
error = xfs_da_read_buf(NULL, dp, mp->m_dirdatablk, -1,
&bp, XFS_DATA_FORK, NULL);
error = xfs_dir2_block_read(NULL, dp, &bp);
if (error)
return error;
ASSERT(bp != NULL);
/*
* Extract the byte offset we start at from the seek pointer.
* We'll skip entries before this.
@ -637,14 +672,11 @@ xfs_dir2_block_lookup_int(
dp = args->dp;
tp = args->trans;
mp = dp->i_mount;
/*
* Read the buffer, return error if we can't get it.
*/
error = xfs_da_read_buf(tp, dp, mp->m_dirdatablk, -1, &bp,
XFS_DATA_FORK, NULL);
error = xfs_dir2_block_read(tp, dp, &bp);
if (error)
return error;
ASSERT(bp != NULL);
hdr = bp->b_addr;
xfs_dir2_data_check(dp, bp);
btp = xfs_dir2_block_tail_p(mp, hdr);