Viewing file:  xfs_dir2_block.c (36.94 KB) -rw-r--r--
Select action/file-type:
 (+) |  (+) |  (+) | Code (+) | Session (+) |  (+) | SDB (+) |  (+) |  (+) |  (+) |  (+) |  (+) |
/*
* Copyright (c) 2000 Silicon Graphics, Inc. All Rights Reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it would be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*
* Further, this software is distributed without any warranty that it is
* free of the rightful claim of any third person regarding infringement
* or the like. Any license provided herein, whether implied or
* otherwise, applies only to this software file. Patent licenses, if
* any, provided herein do not apply to combinations of this program with
* other software, or any other product whatsoever.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write the Free Software Foundation, Inc., 59
* Temple Place - Suite 330, Boston MA 02111-1307, USA.
*
* Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
* Mountain View, CA 94043, or:
*
* http://www.sgi.com
*
* For further information regarding this notice, see:
*
* http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
*/
/*
* xfs_dir2_block.c
* XFS V2 directory implementation, single-block form.
* See xfs_dir2_block.h for the format.
*/
#include <xfs.h>
/*
* Local function prototypes.
*/
static void xfs_dir2_block_log_leaf(xfs_trans_t *tp, xfs_dabuf_t *bp, int first,
int last);
static void xfs_dir2_block_log_tail(xfs_trans_t *tp, xfs_dabuf_t *bp);
static int xfs_dir2_block_lookup_int(xfs_da_args_t *args, xfs_dabuf_t **bpp,
int *entno);
static int xfs_dir2_block_sort(const void *a, const void *b);
/*
* Add an entry to a block directory.
*/
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_block_t *block; /* directory block structure */
xfs_dir2_leaf_entry_t *blp; /* block leaf entries */
xfs_dabuf_t *bp; /* buffer for block */
xfs_dir2_block_tail_t *btp; /* block tail */
int compact; /* need to compact leaf ents */
xfs_dir2_data_entry_t *dep; /* block data entry */
xfs_inode_t *dp; /* directory inode */
xfs_dir2_data_unused_t *dup; /* block unused entry */
int error; /* error return value */
xfs_dir2_data_unused_t *enddup=NULL; /* unused at end of data */
xfs_dahash_t hash; /* hash value of found entry */
int high; /* high index for binary srch */
int highstale; /* high stale index */
int lfloghigh=0; /* last final leaf to log */
int lfloglow=0; /* first final leaf to log */
int len; /* length of the new entry */
int low; /* low index for binary srch */
int lowstale; /* low stale index */
int mid=0; /* midpoint for binary srch */
xfs_mount_t *mp; /* filesystem mount point */
int needlog; /* need to log header */
int needscan; /* need to rescan freespace */
xfs_dir2_data_off_t *tagp; /* pointer to tag value */
xfs_trans_t *tp; /* transaction structure */
xfs_dir2_trace_args("block_addname", args);
dp = args->dp;
tp = args->trans;
mp = dp->i_mount;
/*
* Read the (one and only) directory block into dabuf bp.
*/
if ((error =
xfs_da_read_buf(tp, dp, mp->m_dirdatablk, -1, &bp, XFS_DATA_FORK))) {
return error;
}
ASSERT(bp != NULL);
block = bp->data;
/*
* Check the magic number, corrupted if wrong.
*/
if (INT_GET(block->hdr.magic, ARCH_CONVERT) != XFS_DIR2_BLOCK_MAGIC) {
xfs_da_brelse(tp, bp);
return XFS_ERROR(EFSCORRUPTED);
}
len = XFS_DIR2_DATA_ENTSIZE(args->namelen);
/*
* Set up pointers to parts of the block.
*/
bf = block->hdr.bestfree;
btp = XFS_DIR2_BLOCK_TAIL_P(mp, block);
blp = XFS_DIR2_BLOCK_LEAF_P_ARCH(btp, ARCH_CONVERT);
/*
* No stale entries? Need space for entry and new leaf.
*/
if (INT_GET(btp->stale, ARCH_CONVERT) == 0) {
/*
* Tag just before the first leaf entry.
*/
tagp = (xfs_dir2_data_off_t *)blp - 1;
/*
* Data object just before the first leaf entry.
*/
enddup = (xfs_dir2_data_unused_t *)((char *)block + INT_GET(*tagp, ARCH_CONVERT));
/*
* 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 (INT_GET(enddup->freetag, ARCH_CONVERT) != 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 *)block + INT_GET(bf[0].offset, ARCH_CONVERT));
if (dup == enddup) {
/*
* It is the biggest freespace, is it too small
* to hold the new leaf too?
*/
if (INT_GET(dup->length, ARCH_CONVERT) < len + (uint)sizeof(*blp)) {
/*
* Yes, we use the second-largest
* entry instead if it works.
*/
if (INT_GET(bf[1].length, ARCH_CONVERT) >= len)
dup = (xfs_dir2_data_unused_t *)
((char *)block +
INT_GET(bf[1].offset, ARCH_CONVERT));
else
dup = NULL;
}
} else {
/*
* Not the same free entry,
* just check its length.
*/
if (INT_GET(dup->length, ARCH_CONVERT) < len) {
dup = NULL;
}
}
}
compact = 0;
}
/*
* If there are stale entries we'll use one for the leaf.
* Is the biggest entry enough to avoid compaction?
*/
else if (INT_GET(bf[0].length, ARCH_CONVERT) >= len) {
dup = (xfs_dir2_data_unused_t *)
((char *)block + INT_GET(bf[0].offset, ARCH_CONVERT));
compact = 0;
}
/*
* Will need to compact to make this work.
*/
else {
/*
* Tag just before the first leaf entry.
*/
tagp = (xfs_dir2_data_off_t *)blp - 1;
/*
* Data object just before the first leaf entry.
*/
dup = (xfs_dir2_data_unused_t *)((char *)block + INT_GET(*tagp, ARCH_CONVERT));
/*
* If it's not free then the data will go where the
* leaf data starts now, if it works at all.
*/
if (INT_GET(dup->freetag, ARCH_CONVERT) == XFS_DIR2_DATA_FREE_TAG) {
if (INT_GET(dup->length, ARCH_CONVERT) + (INT_GET(btp->stale, ARCH_CONVERT) - 1) *
(uint)sizeof(*blp) < len)
dup = NULL;
} else if ((INT_GET(btp->stale, ARCH_CONVERT) - 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->justcheck)
xfs_da_brelse(tp, bp);
/*
* 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->justcheck || args->total == 0)
return XFS_ERROR(ENOSPC);
/*
* Convert to the next larger format.
* Then add the new entry in that format.
*/
error = xfs_dir2_block_to_leaf(args, bp);
xfs_da_buf_done(bp);
if (error)
return error;
return xfs_dir2_leaf_addname(args);
}
/*
* Just checking, and it would work, so say so.
*/
if (args->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 = INT_GET(btp->count, ARCH_CONVERT) - 1,
highstale = lfloghigh = -1;
fromidx >= 0;
fromidx--) {
if (INT_GET(blp[fromidx].address, ARCH_CONVERT) == 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 - (INT_GET(btp->stale, ARCH_CONVERT) - 1);
lfloghigh -= INT_GET(btp->stale, ARCH_CONVERT) - 1;
INT_MOD(btp->count, ARCH_CONVERT, -(INT_GET(btp->stale, ARCH_CONVERT) - 1));
xfs_dir2_data_make_free(tp, bp,
(xfs_dir2_data_aoff_t)((char *)blp - (char *)block),
(xfs_dir2_data_aoff_t)((INT_GET(btp->stale, ARCH_CONVERT) - 1) * sizeof(*blp)),
&needlog, &needscan);
blp += INT_GET(btp->stale, ARCH_CONVERT) - 1;
INT_SET(btp->stale, ARCH_CONVERT, 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, (xfs_dir2_data_t *)block,
&needlog, NULL);
needscan = 0;
}
}
/*
* Set leaf logging boundaries to impossible state.
* For the no-stale case they're set explicitly.
*/
else if (INT_GET(btp->stale, ARCH_CONVERT)) {
lfloglow = INT_GET(btp->count, ARCH_CONVERT);
lfloghigh = -1;
}
/*
* Find the slot that's first lower than our hash value, -1 if none.
*/
for (low = 0, high = INT_GET(btp->count, ARCH_CONVERT) - 1; low <= high; ) {
mid = (low + high) >> 1;
if ((hash = INT_GET(blp[mid].hashval, ARCH_CONVERT)) == args->hashval)
break;
if (hash < args->hashval)
low = mid + 1;
else
high = mid - 1;
}
while (mid >= 0 && INT_GET(blp[mid].hashval, ARCH_CONVERT) >= args->hashval) {
mid--;
}
/*
* No stale entries, will use enddup space to hold new leaf.
*/
if (INT_GET(btp->stale, ARCH_CONVERT) == 0) {
/*
* Mark the space needed for the new leaf entry, now in use.
*/
xfs_dir2_data_use_free(tp, bp, enddup,
(xfs_dir2_data_aoff_t)
((char *)enddup - (char *)block + INT_GET(enddup->length, ARCH_CONVERT) -
sizeof(*blp)),
(xfs_dir2_data_aoff_t)sizeof(*blp),
&needlog, &needscan);
/*
* Update the tail (entry count).
*/
INT_MOD(btp->count, ARCH_CONVERT, +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, (xfs_dir2_data_t *)block,
&needlog, NULL);
needscan = 0;
}
/*
* Adjust pointer to the first leaf entry, we're about to move
* the table up one to open up space for the new leaf entry.
* Then adjust our index to match.
*/
blp--;
mid++;
if (mid)
ovbcopy(&blp[1], blp, mid * sizeof(*blp));
lfloglow = 0;
lfloghigh = mid;
}
/*
* Use a stale leaf for our new entry.
*/
else {
for (lowstale = mid;
lowstale >= 0 &&
INT_GET(blp[lowstale].address, ARCH_CONVERT) != XFS_DIR2_NULL_DATAPTR;
lowstale--)
continue;
for (highstale = mid + 1;
highstale < INT_GET(btp->count, ARCH_CONVERT) &&
INT_GET(blp[highstale].address, ARCH_CONVERT) != XFS_DIR2_NULL_DATAPTR &&
(lowstale < 0 || mid - lowstale > highstale - mid);
highstale++)
continue;
/*
* Move entries toward the low-numbered stale entry.
*/
if (lowstale >= 0 &&
(highstale == INT_GET(btp->count, ARCH_CONVERT) ||
mid - lowstale <= highstale - mid)) {
if (mid - lowstale)
ovbcopy(&blp[lowstale + 1], &blp[lowstale],
(mid - lowstale) * sizeof(*blp));
lfloglow = MIN(lowstale, lfloglow);
lfloghigh = MAX(mid, lfloghigh);
}
/*
* Move entries toward the high-numbered stale entry.
*/
else {
ASSERT(highstale < INT_GET(btp->count, ARCH_CONVERT));
mid++;
if (highstale - mid)
ovbcopy(&blp[mid], &blp[mid + 1],
(highstale - mid) * sizeof(*blp));
lfloglow = MIN(mid, lfloglow);
lfloghigh = MAX(highstale, lfloghigh);
}
INT_MOD(btp->stale, ARCH_CONVERT, -1);
}
/*
* Point to the new data entry.
*/
dep = (xfs_dir2_data_entry_t *)dup;
/*
* Fill in the leaf entry.
*/
INT_SET(blp[mid].hashval, ARCH_CONVERT, args->hashval);
INT_SET(blp[mid].address, ARCH_CONVERT, XFS_DIR2_BYTE_TO_DATAPTR(mp, (char *)dep - (char *)block));
xfs_dir2_block_log_leaf(tp, bp, lfloglow, lfloghigh);
/*
* Mark space for the data entry used.
*/
xfs_dir2_data_use_free(tp, bp, dup,
(xfs_dir2_data_aoff_t)((char *)dup - (char *)block),
(xfs_dir2_data_aoff_t)len, &needlog, &needscan);
/*
* Create the new data entry.
*/
INT_SET(dep->inumber, ARCH_CONVERT, args->inumber);
dep->namelen = args->namelen;
bcopy(args->name, dep->name, args->namelen);
tagp = XFS_DIR2_DATA_ENTRY_TAG_P(dep);
INT_SET(*tagp, ARCH_CONVERT, (xfs_dir2_data_off_t)((char *)dep - (char *)block));
/*
* Clean up the bestfree array and log the header, tail, and entry.
*/
if (needscan)
xfs_dir2_data_freescan(mp, (xfs_dir2_data_t *)block, &needlog,
NULL);
if (needlog)
xfs_dir2_data_log_header(tp, bp);
xfs_dir2_block_log_tail(tp, bp);
xfs_dir2_data_log_entry(tp, bp, dep);
xfs_dir2_data_check(dp, bp);
xfs_da_buf_done(bp);
return 0;
}
/*
* Readdir for block directories.
*/
int /* error */
xfs_dir2_block_getdents(
xfs_trans_t *tp, /* transaction (NULL) */
xfs_inode_t *dp, /* incore inode */
uio_t *uio, /* caller's buffer control */
int *eofp, /* eof reached? (out) */
xfs_dirent_t *dbp, /* caller's buffer */
xfs_dir2_put_t put) /* abi's formatting function */
{
xfs_dir2_block_t *block; /* directory block structure */
xfs_dabuf_t *bp; /* buffer for block */
xfs_dir2_block_tail_t *btp; /* block tail */
xfs_dir2_data_entry_t *dep; /* block data entry */
xfs_dir2_data_unused_t *dup; /* block unused entry */
char *endptr; /* end of the data entries */
int error; /* error return value */
xfs_mount_t *mp; /* filesystem mount point */
xfs_dir2_put_args_t p; /* arg package for put rtn */
char *ptr; /* current data entry */
char *savptr; /* saved data entry */
int wantoff; /* starting block offset */
mp = dp->i_mount;
/*
* If the block number in the offset is out of range, we're done.
*/
if (XFS_DIR2_DATAPTR_TO_DB(mp, uio->uio_offset) > mp->m_dirdatablk) {
*eofp = 1;
return 0;
}
/*
* Can't read the block, give up, else get dabuf in bp.
*/
if ((error =
xfs_da_read_buf(tp, dp, mp->m_dirdatablk, -1, &bp, XFS_DATA_FORK))) {
return error;
}
ASSERT(bp != NULL);
/*
* Extract the byte offset we start at from the seek pointer.
* We'll skip entries before this.
*/
wantoff = XFS_DIR2_DATAPTR_TO_OFF(mp, uio->uio_offset);
block = bp->data;
xfs_dir2_data_check(dp, bp);
/*
* Set up values for the loop.
*/
btp = XFS_DIR2_BLOCK_TAIL_P(mp, block);
ptr = (char *)block->u;
endptr = (char *)XFS_DIR2_BLOCK_LEAF_P_ARCH(btp, ARCH_CONVERT);
p.dbp = dbp;
p.put = put;
p.uio = uio;
/*
* Loop over the data portion of the block.
* Each object is a real entry (dep) or an unused one (dup).
*/
while (ptr < endptr) {
dup = (xfs_dir2_data_unused_t *)ptr;
/*
* Unused, skip it.
*/
if (INT_GET(dup->freetag, ARCH_CONVERT) == XFS_DIR2_DATA_FREE_TAG) {
ptr += INT_GET(dup->length, ARCH_CONVERT);
continue;
}
dep = (xfs_dir2_data_entry_t *)ptr;
savptr = ptr; /* In case we need it.. */
/*
* Bump pointer for the next iteration.
*/
ptr += XFS_DIR2_DATA_ENTSIZE(dep->namelen);
/*
* The entry is before the desired starting point, skip it.
*/
if ((char *)dep - (char *)block < wantoff)
continue;
/*
* Set up argument structure for put routine.
*/
p.namelen = dep->namelen;
/*
* NOTE! Linux "filldir" semantics require that the
* offset "cookie" be for this entry, not the
* next; all the actual shuffling to make it
* "look right" to the user is done in filldir.
*/
p.cook = XFS_DIR2_DB_OFF_TO_DATAPTR(mp, mp->m_dirdatablk,
savptr - (char *)block);
#if XFS_BIG_FILESYSTEMS
p.ino = INT_GET(dep->inumber, ARCH_CONVERT) + mp->m_inoadd;
#else
p.ino = INT_GET(dep->inumber, ARCH_CONVERT);
#endif
p.name = (char *)dep->name;
/*
* Put the entry in the caller's buffer.
*/
error = p.put(&p);
/*
* If it didn't fit, set the final offset to here & return.
*/
if (!p.done) {
uio->uio_offset =
XFS_DIR2_DB_OFF_TO_DATAPTR(mp, mp->m_dirdatablk,
(char *)dep - (char *)block);
xfs_da_brelse(tp, bp);
return error;
}
}
/*
* Reached the end of the block.
* Set the offset to a nonexistent block 1 and return.
*/
*eofp = 1;
uio->uio_offset =
XFS_DIR2_DB_OFF_TO_DATAPTR(mp, mp->m_dirdatablk + 1, 0);
xfs_da_brelse(tp, bp);
return 0;
}
/*
* Log leaf entries from the block.
*/
static void
xfs_dir2_block_log_leaf(
xfs_trans_t *tp, /* transaction structure */
xfs_dabuf_t *bp, /* block buffer */
int first, /* index of first logged leaf */
int last) /* index of last logged leaf */
{
xfs_dir2_block_t *block; /* directory block structure */
xfs_dir2_leaf_entry_t *blp; /* block leaf entries */
xfs_dir2_block_tail_t *btp; /* block tail */
xfs_mount_t *mp; /* filesystem mount point */
mp = tp->t_mountp;
block = bp->data;
btp = XFS_DIR2_BLOCK_TAIL_P(mp, block);
blp = XFS_DIR2_BLOCK_LEAF_P_ARCH(btp, ARCH_CONVERT);
xfs_da_log_buf(tp, bp, (uint)((char *)&blp[first] - (char *)block),
(uint)((char *)&blp[last + 1] - (char *)block - 1));
}
/*
* Log the block tail.
*/
static void
xfs_dir2_block_log_tail(
xfs_trans_t *tp, /* transaction structure */
xfs_dabuf_t *bp) /* block buffer */
{
xfs_dir2_block_t *block; /* directory block structure */
xfs_dir2_block_tail_t *btp; /* block tail */
xfs_mount_t *mp; /* filesystem mount point */
mp = tp->t_mountp;
block = bp->data;
btp = XFS_DIR2_BLOCK_TAIL_P(mp, block);
xfs_da_log_buf(tp, bp, (uint)((char *)btp - (char *)block),
(uint)((char *)(btp + 1) - (char *)block - 1));
}
/*
* Look up an entry in the block. This is the external routine,
* xfs_dir2_block_lookup_int does the real work.
*/
int /* error */
xfs_dir2_block_lookup(
xfs_da_args_t *args) /* dir lookup arguments */
{
xfs_dir2_block_t *block; /* block structure */
xfs_dir2_leaf_entry_t *blp; /* block leaf entries */
xfs_dabuf_t *bp; /* block buffer */
xfs_dir2_block_tail_t *btp; /* block tail */
xfs_dir2_data_entry_t *dep; /* block data entry */
xfs_inode_t *dp; /* incore inode */
int ent; /* entry index */
int error; /* error return value */
xfs_mount_t *mp; /* filesystem mount point */
xfs_dir2_trace_args("block_lookup", args);
/*
* Get the buffer, look up the entry.
* If not found (ENOENT) then return, have no buffer.
*/
if ((error = xfs_dir2_block_lookup_int(args, &bp, &ent)))
return error;
dp = args->dp;
mp = dp->i_mount;
block = bp->data;
xfs_dir2_data_check(dp, bp);
btp = XFS_DIR2_BLOCK_TAIL_P(mp, block);
blp = XFS_DIR2_BLOCK_LEAF_P_ARCH(btp, ARCH_CONVERT);
/*
* Get the offset from the leaf entry, to point to the data.
*/
dep = (xfs_dir2_data_entry_t *)
((char *)block + XFS_DIR2_DATAPTR_TO_OFF(mp, INT_GET(blp[ent].address, ARCH_CONVERT)));
/*
* Fill in inode number, release the block.
*/
args->inumber = INT_GET(dep->inumber, ARCH_CONVERT);
xfs_da_brelse(args->trans, bp);
return XFS_ERROR(EEXIST);
}
/*
* Internal block lookup routine.
*/
static int /* error */
xfs_dir2_block_lookup_int(
xfs_da_args_t *args, /* dir lookup arguments */
xfs_dabuf_t **bpp, /* returned block buffer */
int *entno) /* returned entry number */
{
xfs_dir2_dataptr_t addr; /* data entry address */
xfs_dir2_block_t *block; /* block structure */
xfs_dir2_leaf_entry_t *blp; /* block leaf entries */
xfs_dabuf_t *bp; /* block buffer */
xfs_dir2_block_tail_t *btp; /* block tail */
xfs_dir2_data_entry_t *dep; /* block data entry */
xfs_inode_t *dp; /* incore inode */
int error; /* error return value */
xfs_dahash_t hash; /* found hash value */
int high; /* binary search high index */
int low; /* binary search low index */
int mid; /* binary search current idx */
xfs_mount_t *mp; /* filesystem mount point */
xfs_trans_t *tp; /* transaction pointer */
dp = args->dp;
tp = args->trans;
mp = dp->i_mount;
/*
* Read the buffer, return error if we can't get it.
*/
if ((error =
xfs_da_read_buf(tp, dp, mp->m_dirdatablk, -1, &bp, XFS_DATA_FORK))) {
return error;
}
ASSERT(bp != NULL);
block = bp->data;
xfs_dir2_data_check(dp, bp);
btp = XFS_DIR2_BLOCK_TAIL_P(mp, block);
blp = XFS_DIR2_BLOCK_LEAF_P_ARCH(btp, ARCH_CONVERT);
/*
* Loop doing a binary search for our hash value.
* Find our entry, ENOENT if it's not there.
*/
for (low = 0, high = INT_GET(btp->count, ARCH_CONVERT) - 1; ; ) {
ASSERT(low <= high);
mid = (low + high) >> 1;
if ((hash = INT_GET(blp[mid].hashval, ARCH_CONVERT)) == args->hashval)
break;
if (hash < args->hashval)
low = mid + 1;
else
high = mid - 1;
if (low > high) {
ASSERT(args->oknoent);
xfs_da_brelse(tp, bp);
return XFS_ERROR(ENOENT);
}
}
/*
* Back up to the first one with the right hash value.
*/
while (mid > 0 && INT_GET(blp[mid - 1].hashval, ARCH_CONVERT) == args->hashval) {
mid--;
}
/*
* Now loop forward through all the entries with the
* right hash value looking for our name.
*/
do {
if ((addr = INT_GET(blp[mid].address, ARCH_CONVERT)) == XFS_DIR2_NULL_DATAPTR)
continue;
/*
* Get pointer to the entry from the leaf.
*/
dep = (xfs_dir2_data_entry_t *)
((char *)block + XFS_DIR2_DATAPTR_TO_OFF(mp, addr));
/*
* Compare, if it's right give back buffer & entry number.
*/
if (dep->namelen == args->namelen &&
dep->name[0] == args->name[0] &&
bcmp(dep->name, args->name, args->namelen) == 0) {
*bpp = bp;
*entno = mid;
return 0;
}
} while (++mid < INT_GET(btp->count, ARCH_CONVERT) && INT_GET(blp[mid].hashval, ARCH_CONVERT) == hash);
/*
* No match, release the buffer and return ENOENT.
*/
ASSERT(args->oknoent);
xfs_da_brelse(tp, bp);
return XFS_ERROR(ENOENT);
}
/*
* Remove an entry from a block format directory.
* If that makes the block small enough to fit in shortform, transform it.
*/
int /* error */
xfs_dir2_block_removename(
xfs_da_args_t *args) /* directory operation args */
{
xfs_dir2_block_t *block; /* block structure */
xfs_dir2_leaf_entry_t *blp; /* block leaf pointer */
xfs_dabuf_t *bp; /* block buffer */
xfs_dir2_block_tail_t *btp; /* block tail */
xfs_dir2_data_entry_t *dep; /* block data entry */
xfs_inode_t *dp; /* incore inode */
int ent; /* block leaf entry index */
int error; /* error return value */
xfs_mount_t *mp; /* filesystem mount point */
int needlog; /* need to log block header */
int needscan; /* need to fixup bestfree */
xfs_dir2_sf_hdr_t sfh; /* shortform header */
int size; /* shortform size */
xfs_trans_t *tp; /* transaction pointer */
xfs_dir2_trace_args("block_removename", args);
/*
* Look up the entry in the block. Gets the buffer and entry index.
* It will always be there, the vnodeops level does a lookup first.
*/
if ((error = xfs_dir2_block_lookup_int(args, &bp, &ent))) {
return error;
}
dp = args->dp;
tp = args->trans;
mp = dp->i_mount;
block = bp->data;
btp = XFS_DIR2_BLOCK_TAIL_P(mp, block);
blp = XFS_DIR2_BLOCK_LEAF_P_ARCH(btp, ARCH_CONVERT);
/*
* Point to the data entry using the leaf entry.
*/
dep = (xfs_dir2_data_entry_t *)
((char *)block + XFS_DIR2_DATAPTR_TO_OFF(mp, INT_GET(blp[ent].address, ARCH_CONVERT)));
/*
* Mark the data entry's space free.
*/
needlog = needscan = 0;
xfs_dir2_data_make_free(tp, bp,
(xfs_dir2_data_aoff_t)((char *)dep - (char *)block),
XFS_DIR2_DATA_ENTSIZE(dep->namelen), &needlog, &needscan);
/*
* Fix up the block tail.
*/
INT_MOD(btp->stale, ARCH_CONVERT, +1);
xfs_dir2_block_log_tail(tp, bp);
/*
* Remove the leaf entry by marking it stale.
*/
INT_SET(blp[ent].address, ARCH_CONVERT, XFS_DIR2_NULL_DATAPTR);
xfs_dir2_block_log_leaf(tp, bp, ent, ent);
/*
* Fix up bestfree, log the header if necessary.
*/
if (needscan)
xfs_dir2_data_freescan(mp, (xfs_dir2_data_t *)block, &needlog,
NULL);
if (needlog)
xfs_dir2_data_log_header(tp, bp);
xfs_dir2_data_check(dp, bp);
/*
* See if the size as a shortform is good enough.
*/
if ((size = xfs_dir2_block_sfsize(dp, block, &sfh)) >
XFS_IFORK_DSIZE(dp)) {
xfs_da_buf_done(bp);
return 0;
}
/*
* If it works, do the conversion.
*/
return xfs_dir2_block_to_sf(args, bp, size, &sfh);
}
/*
* Replace an entry in a V2 block directory.
* Change the inode number to the new value.
*/
int /* error */
xfs_dir2_block_replace(
xfs_da_args_t *args) /* directory operation args */
{
xfs_dir2_block_t *block; /* block structure */
xfs_dir2_leaf_entry_t *blp; /* block leaf entries */
xfs_dabuf_t *bp; /* block buffer */
xfs_dir2_block_tail_t *btp; /* block tail */
xfs_dir2_data_entry_t *dep; /* block data entry */
xfs_inode_t *dp; /* incore inode */
int ent; /* leaf entry index */
int error; /* error return value */
xfs_mount_t *mp; /* filesystem mount point */
xfs_dir2_trace_args("block_replace", args);
/*
* Lookup the entry in the directory. Get buffer and entry index.
* This will always succeed since the caller has already done a lookup.
*/
if ((error = xfs_dir2_block_lookup_int(args, &bp, &ent))) {
return error;
}
dp = args->dp;
mp = dp->i_mount;
block = bp->data;
btp = XFS_DIR2_BLOCK_TAIL_P(mp, block);
blp = XFS_DIR2_BLOCK_LEAF_P_ARCH(btp, ARCH_CONVERT);
/*
* Point to the data entry we need to change.
*/
dep = (xfs_dir2_data_entry_t *)
((char *)block + XFS_DIR2_DATAPTR_TO_OFF(mp, INT_GET(blp[ent].address, ARCH_CONVERT)));
ASSERT(INT_GET(dep->inumber, ARCH_CONVERT) != args->inumber);
/*
* Change the inode number to the new value.
*/
INT_SET(dep->inumber, ARCH_CONVERT, args->inumber);
xfs_dir2_data_log_entry(args->trans, bp, dep);
xfs_dir2_data_check(dp, bp);
xfs_da_buf_done(bp);
return 0;
}
/*
* Qsort comparison routine for the block leaf entries.
*/
static int /* sort order */
xfs_dir2_block_sort(
const void *a, /* first leaf entry */
const void *b) /* second leaf entry */
{
const xfs_dir2_leaf_entry_t *la; /* first leaf entry */
const xfs_dir2_leaf_entry_t *lb; /* second leaf entry */
la = a;
lb = b;
return INT_GET(la->hashval, ARCH_CONVERT) < INT_GET(lb->hashval, ARCH_CONVERT) ? -1 :
(INT_GET(la->hashval, ARCH_CONVERT) > INT_GET(lb->hashval, ARCH_CONVERT) ? 1 : 0);
}
/*
* Convert a V2 leaf directory to a V2 block directory if possible.
*/
int /* error */
xfs_dir2_leaf_to_block(
xfs_da_args_t *args, /* operation arguments */
xfs_dabuf_t *lbp, /* leaf buffer */
xfs_dabuf_t *dbp) /* data buffer */
{
xfs_dir2_data_off_t *bestsp; /* leaf bests table */
xfs_dir2_block_t *block; /* block structure */
xfs_dir2_block_tail_t *btp; /* block tail */
xfs_inode_t *dp; /* incore directory inode */
xfs_dir2_data_unused_t *dup; /* unused data entry */
int error; /* error return value */
int from; /* leaf from index */
xfs_dir2_leaf_t *leaf; /* leaf structure */
xfs_dir2_leaf_entry_t *lep; /* leaf entry */
xfs_dir2_leaf_tail_t *ltp; /* leaf tail structure */
xfs_mount_t *mp; /* file system mount point */
int needlog; /* need to log data header */
int needscan; /* need to scan for bestfree */
xfs_dir2_sf_hdr_t sfh; /* shortform header */
int size; /* bytes used */
xfs_dir2_data_off_t *tagp; /* end of entry (tag) */
int to; /* block/leaf to index */
xfs_trans_t *tp; /* transaction pointer */
xfs_dir2_trace_args_bb("leaf_to_block", args, lbp, dbp);
dp = args->dp;
tp = args->trans;
mp = dp->i_mount;
leaf = lbp->data;
ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) == XFS_DIR2_LEAF1_MAGIC);
ltp = XFS_DIR2_LEAF_TAIL_P(mp, leaf);
/*
* If there are data blocks other than the first one, take this
* opportunity to remove trailing empty data blocks that may have
* been left behind during no-space-reservation operations.
* These will show up in the leaf bests table.
*/
while (dp->i_d.di_size > mp->m_dirblksize) {
bestsp = XFS_DIR2_LEAF_BESTS_P_ARCH(ltp, ARCH_CONVERT);
if (INT_GET(bestsp[INT_GET(ltp->bestcount, ARCH_CONVERT) - 1], ARCH_CONVERT) ==
mp->m_dirblksize - (uint)sizeof(block->hdr)) {
if ((error =
xfs_dir2_leaf_trim_data(args, lbp,
(xfs_dir2_db_t)(INT_GET(ltp->bestcount, ARCH_CONVERT) - 1))))
goto out;
} else {
error = 0;
goto out;
}
}
/*
* Read the data block if we don't already have it, give up if it fails.
*/
if (dbp == NULL &&
(error = xfs_da_read_buf(tp, dp, mp->m_dirdatablk, -1, &dbp,
XFS_DATA_FORK))) {
goto out;
}
block = dbp->data;
ASSERT(INT_GET(block->hdr.magic, ARCH_CONVERT) == XFS_DIR2_DATA_MAGIC);
/*
* Size of the "leaf" area in the block.
*/
size = (uint)sizeof(block->tail) +
(uint)sizeof(*lep) * (INT_GET(leaf->hdr.count, ARCH_CONVERT) - INT_GET(leaf->hdr.stale, ARCH_CONVERT));
/*
* Look at the last data entry.
*/
tagp = (xfs_dir2_data_off_t *)((char *)block + mp->m_dirblksize) - 1;
dup = (xfs_dir2_data_unused_t *)((char *)block + INT_GET(*tagp, ARCH_CONVERT));
/*
* If it's not free or is too short we can't do it.
*/
if (INT_GET(dup->freetag, ARCH_CONVERT) != XFS_DIR2_DATA_FREE_TAG || INT_GET(dup->length, ARCH_CONVERT) < size) {
error = 0;
goto out;
}
/*
* Start converting it to block form.
*/
INT_SET(block->hdr.magic, ARCH_CONVERT, XFS_DIR2_BLOCK_MAGIC);
needlog = 1;
needscan = 0;
/*
* Use up the space at the end of the block (blp/btp).
*/
xfs_dir2_data_use_free(tp, dbp, dup, mp->m_dirblksize - size, size,
&needlog, &needscan);
/*
* Initialize the block tail.
*/
btp = XFS_DIR2_BLOCK_TAIL_P(mp, block);
INT_SET(btp->count, ARCH_CONVERT, INT_GET(leaf->hdr.count, ARCH_CONVERT) - INT_GET(leaf->hdr.stale, ARCH_CONVERT));
INT_SET(btp->stale, ARCH_CONVERT, 0);
xfs_dir2_block_log_tail(tp, dbp);
/*
* Initialize the block leaf area. We compact out stale entries.
*/
lep = XFS_DIR2_BLOCK_LEAF_P_ARCH(btp, ARCH_CONVERT);
for (from = to = 0; from < INT_GET(leaf->hdr.count, ARCH_CONVERT); from++) {
if (INT_GET(leaf->ents[from].address, ARCH_CONVERT) == XFS_DIR2_NULL_DATAPTR)
continue;
lep[to++] = leaf->ents[from];
}
ASSERT(to == INT_GET(btp->count, ARCH_CONVERT));
xfs_dir2_block_log_leaf(tp, dbp, 0, INT_GET(btp->count, ARCH_CONVERT) - 1);
/*
* Scan the bestfree if we need it and log the data block header.
*/
if (needscan)
xfs_dir2_data_freescan(mp, (xfs_dir2_data_t *)block, &needlog,
NULL);
if (needlog)
xfs_dir2_data_log_header(tp, dbp);
/*
* Pitch the old leaf block.
*/
error = xfs_da_shrink_inode(args, mp->m_dirleafblk, lbp);
lbp = NULL;
if (error) {
goto out;
}
/*
* Now see if the resulting block can be shrunken to shortform.
*/
if ((size = xfs_dir2_block_sfsize(dp, block, &sfh)) >
XFS_IFORK_DSIZE(dp)) {
error = 0;
goto out;
}
return xfs_dir2_block_to_sf(args, dbp, size, &sfh);
out:
if (lbp)
xfs_da_buf_done(lbp);
if (dbp)
xfs_da_buf_done(dbp);
return error;
}
/*
* Convert the shortform directory to block form.
*/
int /* error */
xfs_dir2_sf_to_block(
xfs_da_args_t *args) /* operation arguments */
{
xfs_dir2_db_t blkno; /* dir-relative block # (0) */
xfs_dir2_block_t *block; /* block structure */
xfs_dir2_leaf_entry_t *blp; /* block leaf entries */
xfs_dabuf_t *bp; /* block buffer */
xfs_dir2_block_tail_t *btp; /* block tail pointer */
char buf[XFS_DIR2_SF_MAX_SIZE]; /* sf buffer */
xfs_dir2_data_entry_t *dep; /* data entry pointer */
xfs_inode_t *dp; /* incore directory inode */
int dummy; /* trash */
xfs_dir2_data_unused_t *dup; /* unused entry pointer */
int endoffset; /* end of data objects */
int error; /* error return value */
int i; /* index */
xfs_mount_t *mp; /* filesystem mount point */
int needlog; /* need to log block header */
int needscan; /* need to scan block freespc */
int newoffset; /* offset from current entry */
int offset; /* target block offset */
xfs_dir2_sf_entry_t *sfep; /* sf entry pointer */
xfs_dir2_sf_t *sfp; /* shortform structure */
xfs_dir2_data_off_t *tagp; /* end of data entry */
xfs_trans_t *tp; /* transaction pointer */
xfs_dir2_trace_args("sf_to_block", args);
dp = args->dp;
tp = args->trans;
mp = dp->i_mount;
ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
/*
* Bomb out if the shortform directory is way too short.
*/
if (dp->i_d.di_size < offsetof(xfs_dir2_sf_hdr_t, parent)) {
ASSERT(XFS_FORCED_SHUTDOWN(mp));
return XFS_ERROR(EIO);
}
ASSERT(dp->i_df.if_bytes == dp->i_d.di_size);
ASSERT(dp->i_df.if_u1.if_data != NULL);
sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
ASSERT(dp->i_d.di_size >= XFS_DIR2_SF_HDR_SIZE(sfp->hdr.i8count));
/*
* Copy the directory into the stack buffer.
* Then pitch the incore inode data so we can make extents.
*/
bcopy(sfp, buf, dp->i_df.if_bytes);
xfs_idata_realloc(dp, -dp->i_df.if_bytes, XFS_DATA_FORK);
dp->i_d.di_size = 0;
xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
/*
* Reset pointer - old sfp is gone.
*/
sfp = (xfs_dir2_sf_t *)buf;
/*
* Add block 0 to the inode.
*/
error = xfs_dir2_grow_inode(args, XFS_DIR2_DATA_SPACE, &blkno);
if (error) {
return error;
}
/*
* Initialize the data block.
*/
error = xfs_dir2_data_init(args, blkno, &bp);
if (error) {
return error;
}
block = bp->data;
INT_SET(block->hdr.magic, ARCH_CONVERT, XFS_DIR2_BLOCK_MAGIC);
/*
* Compute size of block "tail" area.
*/
i = (uint)sizeof(*btp) +
(INT_GET(sfp->hdr.count, ARCH_CONVERT) + 2) * (uint)sizeof(xfs_dir2_leaf_entry_t);
/*
* The whole thing is initialized to free by the init routine.
* Say we're using the leaf and tail area.
*/
dup = (xfs_dir2_data_unused_t *)block->u;
needlog = needscan = 0;
xfs_dir2_data_use_free(tp, bp, dup, mp->m_dirblksize - i, i, &needlog,
&needscan);
ASSERT(needscan == 0);
/*
* Fill in the tail.
*/
btp = XFS_DIR2_BLOCK_TAIL_P(mp, block);
INT_SET(btp->count, ARCH_CONVERT, INT_GET(sfp->hdr.count, ARCH_CONVERT) + 2); /* ., .. */
INT_ZERO(btp->stale, ARCH_CONVERT);
blp = XFS_DIR2_BLOCK_LEAF_P_ARCH(btp, ARCH_CONVERT);
endoffset = (uint)((char *)blp - (char *)block);
/*
* Remove the freespace, we'll manage it.
*/
xfs_dir2_data_use_free(tp, bp, dup,
(xfs_dir2_data_aoff_t)((char *)dup - (char *)block),
INT_GET(dup->length, ARCH_CONVERT), &needlog, &needscan);
/*
* Create entry for .
*/
dep = (xfs_dir2_data_entry_t *)
((char *)block + XFS_DIR2_DATA_DOT_OFFSET);
INT_SET(dep->inumber, ARCH_CONVERT, dp->i_ino);
dep->namelen = 1;
dep->name[0] = '.';
tagp = XFS_DIR2_DATA_ENTRY_TAG_P(dep);
INT_SET(*tagp, ARCH_CONVERT, (xfs_dir2_data_off_t)((char *)dep - (char *)block));
xfs_dir2_data_log_entry(tp, bp, dep);
INT_SET(blp[0].hashval, ARCH_CONVERT, xfs_dir_hash_dot);
INT_SET(blp[0].address, ARCH_CONVERT, XFS_DIR2_BYTE_TO_DATAPTR(mp, (char *)dep - (char *)block));
/*
* Create entry for ..
*/
dep = (xfs_dir2_data_entry_t *)
((char *)block + XFS_DIR2_DATA_DOTDOT_OFFSET);
INT_SET(dep->inumber, ARCH_CONVERT, XFS_DIR2_SF_GET_INUMBER_ARCH(sfp, &sfp->hdr.parent, ARCH_CONVERT));
dep->namelen = 2;
dep->name[0] = dep->name[1] = '.';
tagp = XFS_DIR2_DATA_ENTRY_TAG_P(dep);
INT_SET(*tagp, ARCH_CONVERT, (xfs_dir2_data_off_t)((char *)dep - (char *)block));
xfs_dir2_data_log_entry(tp, bp, dep);
INT_SET(blp[1].hashval, ARCH_CONVERT, xfs_dir_hash_dotdot);
INT_SET(blp[1].address, ARCH_CONVERT, XFS_DIR2_BYTE_TO_DATAPTR(mp, (char *)dep - (char *)block));
offset = XFS_DIR2_DATA_FIRST_OFFSET;
/*
* Loop over existing entries, stuff them in.
*/
if ((i = 0) == INT_GET(sfp->hdr.count, ARCH_CONVERT))
sfep = NULL;
else
sfep = XFS_DIR2_SF_FIRSTENTRY(sfp);
/*
* Need to preserve the existing offset values in the sf directory.
* Insert holes (unused entries) where necessary.
*/
while (offset < endoffset) {
/*
* sfep is null when we reach the end of the list.
*/
if (sfep == NULL)
newoffset = endoffset;
else
newoffset = XFS_DIR2_SF_GET_OFFSET_ARCH(sfep, ARCH_CONVERT);
/*
* There should be a hole here, make one.
*/
if (offset < newoffset) {
dup = (xfs_dir2_data_unused_t *)
((char *)block + offset);
INT_SET(dup->freetag, ARCH_CONVERT, XFS_DIR2_DATA_FREE_TAG);
INT_SET(dup->length, ARCH_CONVERT, newoffset - offset);
INT_SET(*XFS_DIR2_DATA_UNUSED_TAG_P_ARCH(dup, ARCH_CONVERT), ARCH_CONVERT,
(xfs_dir2_data_off_t)
((char *)dup - (char *)block));
xfs_dir2_data_log_unused(tp, bp, dup);
(void)xfs_dir2_data_freeinsert((xfs_dir2_data_t *)block,
dup, &dummy);
offset += INT_GET(dup->length, ARCH_CONVERT);
continue;
}
/*
* Copy a real entry.
*/
dep = (xfs_dir2_data_entry_t *)((char *)block + newoffset);
INT_SET(dep->inumber, ARCH_CONVERT, XFS_DIR2_SF_GET_INUMBER_ARCH(sfp,
XFS_DIR2_SF_INUMBERP(sfep), ARCH_CONVERT));
dep->namelen = sfep->namelen;
bcopy(sfep->name, dep->name, dep->namelen);
tagp = XFS_DIR2_DATA_ENTRY_TAG_P(dep);
INT_SET(*tagp, ARCH_CONVERT, (xfs_dir2_data_off_t)((char *)dep - (char *)block));
xfs_dir2_data_log_entry(tp, bp, dep);
INT_SET(blp[2 + i].hashval, ARCH_CONVERT, xfs_da_hashname((char *)sfep->name, sfep->namelen));
INT_SET(blp[2 + i].address, ARCH_CONVERT, XFS_DIR2_BYTE_TO_DATAPTR(mp,
(char *)dep - (char *)block));
offset = (int)((char *)(tagp + 1) - (char *)block);
if (++i == INT_GET(sfp->hdr.count, ARCH_CONVERT))
sfep = NULL;
else
sfep = XFS_DIR2_SF_NEXTENTRY(sfp, sfep);
}
/*
* Sort the leaf entries by hash value.
*/
qsort(blp, INT_GET(btp->count, ARCH_CONVERT), sizeof(*blp), xfs_dir2_block_sort);
/*
* Log the leaf entry area and tail.
* Already logged the header in data_init, ignore needlog.
*/
ASSERT(needscan == 0);
xfs_dir2_block_log_leaf(tp, bp, 0, INT_GET(btp->count, ARCH_CONVERT) - 1);
xfs_dir2_block_log_tail(tp, bp);
xfs_dir2_data_check(dp, bp);
xfs_da_buf_done(bp);
return 0;
}
|