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linux/fs/xfs/xfs_rtalloc.c
Nathan Scott 4cc929ee30 [XFS] Don't grow filesystems past the size they can index. 
When growing a filesystem we don't check to see if the new size overflows
the page cache index range, so we can do silly things like grow a
filesystem page 16TB on a 32bit. Check new filesystem sizes against the
limits the kernel can support.

SGI-PV: 957886
SGI-Modid: xfs-linux-melb:xfs-kern:28563a

Signed-Off-By: Nathan Scott <nscott@aconex.com>
Signed-off-by: David Chinner <dgc@sgi.com>
Signed-off-by: Tim Shimmin <tes@sgi.com>
2007-07-14 15:21:29 +10:00

2335 lines
62 KiB
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/*
* Copyright (c) 2000-2005 Silicon Graphics, Inc.
* All Rights Reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms 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. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "xfs.h"
#include "xfs_fs.h"
#include "xfs_types.h"
#include "xfs_bit.h"
#include "xfs_log.h"
#include "xfs_inum.h"
#include "xfs_trans.h"
#include "xfs_sb.h"
#include "xfs_ag.h"
#include "xfs_dir2.h"
#include "xfs_dmapi.h"
#include "xfs_mount.h"
#include "xfs_bmap_btree.h"
#include "xfs_alloc_btree.h"
#include "xfs_ialloc_btree.h"
#include "xfs_dir2_sf.h"
#include "xfs_attr_sf.h"
#include "xfs_dinode.h"
#include "xfs_inode.h"
#include "xfs_btree.h"
#include "xfs_ialloc.h"
#include "xfs_alloc.h"
#include "xfs_bmap.h"
#include "xfs_rtalloc.h"
#include "xfs_fsops.h"
#include "xfs_error.h"
#include "xfs_rw.h"
#include "xfs_inode_item.h"
#include "xfs_trans_space.h"
/*
* Prototypes for internal functions.
*/
STATIC int xfs_rtallocate_range(xfs_mount_t *, xfs_trans_t *, xfs_rtblock_t,
xfs_extlen_t, xfs_buf_t **, xfs_fsblock_t *);
STATIC int xfs_rtany_summary(xfs_mount_t *, xfs_trans_t *, int, int,
xfs_rtblock_t, xfs_buf_t **, xfs_fsblock_t *, int *);
STATIC int xfs_rtcheck_range(xfs_mount_t *, xfs_trans_t *, xfs_rtblock_t,
xfs_extlen_t, int, xfs_rtblock_t *, int *);
STATIC int xfs_rtfind_back(xfs_mount_t *, xfs_trans_t *, xfs_rtblock_t,
xfs_rtblock_t, xfs_rtblock_t *);
STATIC int xfs_rtfind_forw(xfs_mount_t *, xfs_trans_t *, xfs_rtblock_t,
xfs_rtblock_t, xfs_rtblock_t *);
STATIC int xfs_rtget_summary( xfs_mount_t *, xfs_trans_t *, int,
xfs_rtblock_t, xfs_buf_t **, xfs_fsblock_t *, xfs_suminfo_t *);
STATIC int xfs_rtmodify_range(xfs_mount_t *, xfs_trans_t *, xfs_rtblock_t,
xfs_extlen_t, int);
STATIC int xfs_rtmodify_summary(xfs_mount_t *, xfs_trans_t *, int,
xfs_rtblock_t, int, xfs_buf_t **, xfs_fsblock_t *);
/*
* Internal functions.
*/
/*
* xfs_lowbit32: get low bit set out of 32-bit argument, -1 if none set.
*/
STATIC int
xfs_lowbit32(
__uint32_t v)
{
if (v)
return ffs(v) - 1;
return -1;
}
/*
* Allocate space to the bitmap or summary file, and zero it, for growfs.
*/
STATIC int /* error */
xfs_growfs_rt_alloc(
xfs_mount_t *mp, /* file system mount point */
xfs_extlen_t oblocks, /* old count of blocks */
xfs_extlen_t nblocks, /* new count of blocks */
xfs_ino_t ino) /* inode number (bitmap/summary) */
{
xfs_fileoff_t bno; /* block number in file */
xfs_buf_t *bp; /* temporary buffer for zeroing */
int cancelflags; /* flags for xfs_trans_cancel */
int committed; /* transaction committed flag */
xfs_daddr_t d; /* disk block address */
int error; /* error return value */
xfs_fsblock_t firstblock; /* first block allocated in xaction */
xfs_bmap_free_t flist; /* list of freed blocks */
xfs_fsblock_t fsbno; /* filesystem block for bno */
xfs_inode_t *ip; /* pointer to incore inode */
xfs_bmbt_irec_t map; /* block map output */
int nmap; /* number of block maps */
int resblks; /* space reservation */
xfs_trans_t *tp; /* transaction pointer */
/*
* Allocate space to the file, as necessary.
*/
while (oblocks < nblocks) {
tp = xfs_trans_alloc(mp, XFS_TRANS_GROWFSRT_ALLOC);
resblks = XFS_GROWFSRT_SPACE_RES(mp, nblocks - oblocks);
cancelflags = 0;
/*
* Reserve space & log for one extent added to the file.
*/
if ((error = xfs_trans_reserve(tp, resblks,
XFS_GROWRTALLOC_LOG_RES(mp), 0,
XFS_TRANS_PERM_LOG_RES,
XFS_DEFAULT_PERM_LOG_COUNT)))
goto error_exit;
cancelflags = XFS_TRANS_RELEASE_LOG_RES;
/*
* Lock the inode.
*/
if ((error = xfs_trans_iget(mp, tp, ino, 0,
XFS_ILOCK_EXCL, &ip)))
goto error_exit;
XFS_BMAP_INIT(&flist, &firstblock);
/*
* Allocate blocks to the bitmap file.
*/
nmap = 1;
cancelflags |= XFS_TRANS_ABORT;
error = xfs_bmapi(tp, ip, oblocks, nblocks - oblocks,
XFS_BMAPI_WRITE | XFS_BMAPI_METADATA, &firstblock,
resblks, &map, &nmap, &flist, NULL);
if (!error && nmap < 1)
error = XFS_ERROR(ENOSPC);
if (error)
goto error_exit;
/*
* Free any blocks freed up in the transaction, then commit.
*/
error = xfs_bmap_finish(&tp, &flist, &committed);
if (error)
goto error_exit;
xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
/*
* Now we need to clear the allocated blocks.
* Do this one block per transaction, to keep it simple.
*/
cancelflags = 0;
for (bno = map.br_startoff, fsbno = map.br_startblock;
bno < map.br_startoff + map.br_blockcount;
bno++, fsbno++) {
tp = xfs_trans_alloc(mp, XFS_TRANS_GROWFSRT_ZERO);
/*
* Reserve log for one block zeroing.
*/
if ((error = xfs_trans_reserve(tp, 0,
XFS_GROWRTZERO_LOG_RES(mp), 0, 0, 0)))
goto error_exit;
/*
* Lock the bitmap inode.
*/
if ((error = xfs_trans_iget(mp, tp, ino, 0,
XFS_ILOCK_EXCL, &ip)))
goto error_exit;
/*
* Get a buffer for the block.
*/
d = XFS_FSB_TO_DADDR(mp, fsbno);
bp = xfs_trans_get_buf(tp, mp->m_ddev_targp, d,
mp->m_bsize, 0);
if (bp == NULL) {
error = XFS_ERROR(EIO);
goto error_exit;
}
memset(XFS_BUF_PTR(bp), 0, mp->m_sb.sb_blocksize);
xfs_trans_log_buf(tp, bp, 0, mp->m_sb.sb_blocksize - 1);
/*
* Commit the transaction.
*/
xfs_trans_commit(tp, 0);
}
/*
* Go on to the next extent, if any.
*/
oblocks = map.br_startoff + map.br_blockcount;
}
return 0;
error_exit:
xfs_trans_cancel(tp, cancelflags);
return error;
}
/*
* Attempt to allocate an extent minlen<=len<=maxlen starting from
* bitmap block bbno. If we don't get maxlen then use prod to trim
* the length, if given. Returns error; returns starting block in *rtblock.
* The lengths are all in rtextents.
*/
STATIC int /* error */
xfs_rtallocate_extent_block(
xfs_mount_t *mp, /* file system mount point */
xfs_trans_t *tp, /* transaction pointer */
xfs_rtblock_t bbno, /* bitmap block number */
xfs_extlen_t minlen, /* minimum length to allocate */
xfs_extlen_t maxlen, /* maximum length to allocate */
xfs_extlen_t *len, /* out: actual length allocated */
xfs_rtblock_t *nextp, /* out: next block to try */
xfs_buf_t **rbpp, /* in/out: summary block buffer */
xfs_fsblock_t *rsb, /* in/out: summary block number */
xfs_extlen_t prod, /* extent product factor */
xfs_rtblock_t *rtblock) /* out: start block allocated */
{
xfs_rtblock_t besti; /* best rtblock found so far */
xfs_rtblock_t bestlen; /* best length found so far */
xfs_rtblock_t end; /* last rtblock in chunk */
int error; /* error value */
xfs_rtblock_t i; /* current rtblock trying */
xfs_rtblock_t next; /* next rtblock to try */
int stat; /* status from internal calls */
/*
* Loop over all the extents starting in this bitmap block,
* looking for one that's long enough.
*/
for (i = XFS_BLOCKTOBIT(mp, bbno), besti = -1, bestlen = 0,
end = XFS_BLOCKTOBIT(mp, bbno + 1) - 1;
i <= end;
i++) {
/*
* See if there's a free extent of maxlen starting at i.
* If it's not so then next will contain the first non-free.
*/
error = xfs_rtcheck_range(mp, tp, i, maxlen, 1, &next, &stat);
if (error) {
return error;
}
if (stat) {
/*
* i for maxlen is all free, allocate and return that.
*/
error = xfs_rtallocate_range(mp, tp, i, maxlen, rbpp,
rsb);
if (error) {
return error;
}
*len = maxlen;
*rtblock = i;
return 0;
}
/*
* In the case where we have a variable-sized allocation
* request, figure out how big this free piece is,
* and if it's big enough for the minimum, and the best
* so far, remember it.
*/
if (minlen < maxlen) {
xfs_rtblock_t thislen; /* this extent size */
thislen = next - i;
if (thislen >= minlen && thislen > bestlen) {
besti = i;
bestlen = thislen;
}
}
/*
* If not done yet, find the start of the next free space.
*/
if (next < end) {
error = xfs_rtfind_forw(mp, tp, next, end, &i);
if (error) {
return error;
}
} else
break;
}
/*
* Searched the whole thing & didn't find a maxlen free extent.
*/
if (minlen < maxlen && besti != -1) {
xfs_extlen_t p; /* amount to trim length by */
/*
* If size should be a multiple of prod, make that so.
*/
if (prod > 1 && (p = do_mod(bestlen, prod)))
bestlen -= p;
/*
* Allocate besti for bestlen & return that.
*/
error = xfs_rtallocate_range(mp, tp, besti, bestlen, rbpp, rsb);
if (error) {
return error;
}
*len = bestlen;
*rtblock = besti;
return 0;
}
/*
* Allocation failed. Set *nextp to the next block to try.
*/
*nextp = next;
*rtblock = NULLRTBLOCK;
return 0;
}
/*
* Allocate an extent of length minlen<=len<=maxlen, starting at block
* bno. If we don't get maxlen then use prod to trim the length, if given.
* Returns error; returns starting block in *rtblock.
* The lengths are all in rtextents.
*/
STATIC int /* error */
xfs_rtallocate_extent_exact(
xfs_mount_t *mp, /* file system mount point */
xfs_trans_t *tp, /* transaction pointer */
xfs_rtblock_t bno, /* starting block number to allocate */
xfs_extlen_t minlen, /* minimum length to allocate */
xfs_extlen_t maxlen, /* maximum length to allocate */
xfs_extlen_t *len, /* out: actual length allocated */
xfs_buf_t **rbpp, /* in/out: summary block buffer */
xfs_fsblock_t *rsb, /* in/out: summary block number */
xfs_extlen_t prod, /* extent product factor */
xfs_rtblock_t *rtblock) /* out: start block allocated */
{
int error; /* error value */
xfs_extlen_t i; /* extent length trimmed due to prod */
int isfree; /* extent is free */
xfs_rtblock_t next; /* next block to try (dummy) */
ASSERT(minlen % prod == 0 && maxlen % prod == 0);
/*
* Check if the range in question (for maxlen) is free.
*/
error = xfs_rtcheck_range(mp, tp, bno, maxlen, 1, &next, &isfree);
if (error) {
return error;
}
if (isfree) {
/*
* If it is, allocate it and return success.
*/
error = xfs_rtallocate_range(mp, tp, bno, maxlen, rbpp, rsb);
if (error) {
return error;
}
*len = maxlen;
*rtblock = bno;
return 0;
}
/*
* If not, allocate what there is, if it's at least minlen.
*/
maxlen = next - bno;
if (maxlen < minlen) {
/*
* Failed, return failure status.
*/
*rtblock = NULLRTBLOCK;
return 0;
}
/*
* Trim off tail of extent, if prod is specified.
*/
if (prod > 1 && (i = maxlen % prod)) {
maxlen -= i;
if (maxlen < minlen) {
/*
* Now we can't do it, return failure status.
*/
*rtblock = NULLRTBLOCK;
return 0;
}
}
/*
* Allocate what we can and return it.
*/
error = xfs_rtallocate_range(mp, tp, bno, maxlen, rbpp, rsb);
if (error) {
return error;
}
*len = maxlen;
*rtblock = bno;
return 0;
}
/*
* Allocate an extent of length minlen<=len<=maxlen, starting as near
* to bno as possible. If we don't get maxlen then use prod to trim
* the length, if given. The lengths are all in rtextents.
*/
STATIC int /* error */
xfs_rtallocate_extent_near(
xfs_mount_t *mp, /* file system mount point */
xfs_trans_t *tp, /* transaction pointer */
xfs_rtblock_t bno, /* starting block number to allocate */
xfs_extlen_t minlen, /* minimum length to allocate */
xfs_extlen_t maxlen, /* maximum length to allocate */
xfs_extlen_t *len, /* out: actual length allocated */
xfs_buf_t **rbpp, /* in/out: summary block buffer */
xfs_fsblock_t *rsb, /* in/out: summary block number */
xfs_extlen_t prod, /* extent product factor */
xfs_rtblock_t *rtblock) /* out: start block allocated */
{
int any; /* any useful extents from summary */
xfs_rtblock_t bbno; /* bitmap block number */
int error; /* error value */
int i; /* bitmap block offset (loop control) */
int j; /* secondary loop control */
int log2len; /* log2 of minlen */
xfs_rtblock_t n; /* next block to try */
xfs_rtblock_t r; /* result block */
ASSERT(minlen % prod == 0 && maxlen % prod == 0);
/*
* If the block number given is off the end, silently set it to
* the last block.
*/
if (bno >= mp->m_sb.sb_rextents)
bno = mp->m_sb.sb_rextents - 1;
/*
* Try the exact allocation first.
*/
error = xfs_rtallocate_extent_exact(mp, tp, bno, minlen, maxlen, len,
rbpp, rsb, prod, &r);
if (error) {
return error;
}
/*
* If the exact allocation worked, return that.
*/
if (r != NULLRTBLOCK) {
*rtblock = r;
return 0;
}
bbno = XFS_BITTOBLOCK(mp, bno);
i = 0;
log2len = xfs_highbit32(minlen);
/*
* Loop over all bitmap blocks (bbno + i is current block).
*/
for (;;) {
/*
* Get summary information of extents of all useful levels
* starting in this bitmap block.
*/
error = xfs_rtany_summary(mp, tp, log2len, mp->m_rsumlevels - 1,
bbno + i, rbpp, rsb, &any);
if (error) {
return error;
}
/*
* If there are any useful extents starting here, try
* allocating one.
*/
if (any) {
/*
* On the positive side of the starting location.
*/
if (i >= 0) {
/*
* Try to allocate an extent starting in
* this block.
*/
error = xfs_rtallocate_extent_block(mp, tp,
bbno + i, minlen, maxlen, len, &n, rbpp,
rsb, prod, &r);
if (error) {
return error;
}
/*
* If it worked, return it.
*/
if (r != NULLRTBLOCK) {
*rtblock = r;
return 0;
}
}
/*
* On the negative side of the starting location.
*/
else { /* i < 0 */
/*
* Loop backwards through the bitmap blocks from
* the starting point-1 up to where we are now.
* There should be an extent which ends in this
* bitmap block and is long enough.
*/
for (j = -1; j > i; j--) {
/*
* Grab the summary information for
* this bitmap block.
*/
error = xfs_rtany_summary(mp, tp,
log2len, mp->m_rsumlevels - 1,
bbno + j, rbpp, rsb, &any);
if (error) {
return error;
}
/*
* If there's no extent given in the
* summary that means the extent we
* found must carry over from an
* earlier block. If there is an
* extent given, we've already tried
* that allocation, don't do it again.
*/
if (any)
continue;
error = xfs_rtallocate_extent_block(mp,
tp, bbno + j, minlen, maxlen,
len, &n, rbpp, rsb, prod, &r);
if (error) {
return error;
}
/*
* If it works, return the extent.
*/
if (r != NULLRTBLOCK) {
*rtblock = r;
return 0;
}
}
/*
* There weren't intervening bitmap blocks
* with a long enough extent, or the
* allocation didn't work for some reason
* (i.e. it's a little * too short).
* Try to allocate from the summary block
* that we found.
*/
error = xfs_rtallocate_extent_block(mp, tp,
bbno + i, minlen, maxlen, len, &n, rbpp,
rsb, prod, &r);
if (error) {
return error;
}
/*
* If it works, return the extent.
*/
if (r != NULLRTBLOCK) {
*rtblock = r;
return 0;
}
}
}
/*
* Loop control. If we were on the positive side, and there's
* still more blocks on the negative side, go there.
*/
if (i > 0 && (int)bbno - i >= 0)
i = -i;
/*
* If positive, and no more negative, but there are more
* positive, go there.
*/
else if (i > 0 && (int)bbno + i < mp->m_sb.sb_rbmblocks - 1)
i++;
/*
* If negative or 0 (just started), and there are positive
* blocks to go, go there. The 0 case moves to block 1.
*/
else if (i <= 0 && (int)bbno - i < mp->m_sb.sb_rbmblocks - 1)
i = 1 - i;
/*
* If negative or 0 and there are more negative blocks,
* go there.
*/
else if (i <= 0 && (int)bbno + i > 0)
i--;
/*
* Must be done. Return failure.
*/
else
break;
}
*rtblock = NULLRTBLOCK;
return 0;
}
/*
* Allocate an extent of length minlen<=len<=maxlen, with no position
* specified. If we don't get maxlen then use prod to trim
* the length, if given. The lengths are all in rtextents.
*/
STATIC int /* error */
xfs_rtallocate_extent_size(
xfs_mount_t *mp, /* file system mount point */
xfs_trans_t *tp, /* transaction pointer */
xfs_extlen_t minlen, /* minimum length to allocate */
xfs_extlen_t maxlen, /* maximum length to allocate */
xfs_extlen_t *len, /* out: actual length allocated */
xfs_buf_t **rbpp, /* in/out: summary block buffer */
xfs_fsblock_t *rsb, /* in/out: summary block number */
xfs_extlen_t prod, /* extent product factor */
xfs_rtblock_t *rtblock) /* out: start block allocated */
{
int error; /* error value */
int i; /* bitmap block number */
int l; /* level number (loop control) */
xfs_rtblock_t n; /* next block to be tried */
xfs_rtblock_t r; /* result block number */
xfs_suminfo_t sum; /* summary information for extents */
ASSERT(minlen % prod == 0 && maxlen % prod == 0);
/*
* Loop over all the levels starting with maxlen.
* At each level, look at all the bitmap blocks, to see if there
* are extents starting there that are long enough (>= maxlen).
* Note, only on the initial level can the allocation fail if
* the summary says there's an extent.
*/
for (l = xfs_highbit32(maxlen); l < mp->m_rsumlevels; l++) {
/*
* Loop over all the bitmap blocks.
*/
for (i = 0; i < mp->m_sb.sb_rbmblocks; i++) {
/*
* Get the summary for this level/block.
*/
error = xfs_rtget_summary(mp, tp, l, i, rbpp, rsb,
&sum);
if (error) {
return error;
}
/*
* Nothing there, on to the next block.
*/
if (!sum)
continue;
/*
* Try allocating the extent.
*/
error = xfs_rtallocate_extent_block(mp, tp, i, maxlen,
maxlen, len, &n, rbpp, rsb, prod, &r);
if (error) {
return error;
}
/*
* If it worked, return that.
*/
if (r != NULLRTBLOCK) {
*rtblock = r;
return 0;
}
/*
* If the "next block to try" returned from the
* allocator is beyond the next bitmap block,
* skip to that bitmap block.
*/
if (XFS_BITTOBLOCK(mp, n) > i + 1)
i = XFS_BITTOBLOCK(mp, n) - 1;
}
}
/*
* Didn't find any maxlen blocks. Try smaller ones, unless
* we're asking for a fixed size extent.
*/
if (minlen > --maxlen) {
*rtblock = NULLRTBLOCK;
return 0;
}
/*
* Loop over sizes, from maxlen down to minlen.
* This time, when we do the allocations, allow smaller ones
* to succeed.
*/
for (l = xfs_highbit32(maxlen); l >= xfs_highbit32(minlen); l--) {
/*
* Loop over all the bitmap blocks, try an allocation
* starting in that block.
*/
for (i = 0; i < mp->m_sb.sb_rbmblocks; i++) {
/*
* Get the summary information for this level/block.
*/
error = xfs_rtget_summary(mp, tp, l, i, rbpp, rsb,
&sum);
if (error) {
return error;
}
/*
* If nothing there, go on to next.
*/
if (!sum)
continue;
/*
* Try the allocation. Make sure the specified
* minlen/maxlen are in the possible range for
* this summary level.
*/
error = xfs_rtallocate_extent_block(mp, tp, i,
XFS_RTMAX(minlen, 1 << l),
XFS_RTMIN(maxlen, (1 << (l + 1)) - 1),
len, &n, rbpp, rsb, prod, &r);
if (error) {
return error;
}
/*
* If it worked, return that extent.
*/
if (r != NULLRTBLOCK) {
*rtblock = r;
return 0;
}
/*
* If the "next block to try" returned from the
* allocator is beyond the next bitmap block,
* skip to that bitmap block.
*/
if (XFS_BITTOBLOCK(mp, n) > i + 1)
i = XFS_BITTOBLOCK(mp, n) - 1;
}
}
/*
* Got nothing, return failure.
*/
*rtblock = NULLRTBLOCK;
return 0;
}
/*
* Mark an extent specified by start and len allocated.
* Updates all the summary information as well as the bitmap.
*/
STATIC int /* error */
xfs_rtallocate_range(
xfs_mount_t *mp, /* file system mount point */
xfs_trans_t *tp, /* transaction pointer */
xfs_rtblock_t start, /* start block to allocate */
xfs_extlen_t len, /* length to allocate */
xfs_buf_t **rbpp, /* in/out: summary block buffer */
xfs_fsblock_t *rsb) /* in/out: summary block number */
{
xfs_rtblock_t end; /* end of the allocated extent */
int error; /* error value */
xfs_rtblock_t postblock; /* first block allocated > end */
xfs_rtblock_t preblock; /* first block allocated < start */
end = start + len - 1;
/*
* Assume we're allocating out of the middle of a free extent.
* We need to find the beginning and end of the extent so we can
* properly update the summary.
*/
error = xfs_rtfind_back(mp, tp, start, 0, &preblock);
if (error) {
return error;
}
/*
* Find the next allocated block (end of free extent).
*/
error = xfs_rtfind_forw(mp, tp, end, mp->m_sb.sb_rextents - 1,
&postblock);
if (error) {
return error;
}
/*
* Decrement the summary information corresponding to the entire
* (old) free extent.
*/
error = xfs_rtmodify_summary(mp, tp,
XFS_RTBLOCKLOG(postblock + 1 - preblock),
XFS_BITTOBLOCK(mp, preblock), -1, rbpp, rsb);
if (error) {
return error;
}
/*
* If there are blocks not being allocated at the front of the
* old extent, add summary data for them to be free.
*/
if (preblock < start) {
error = xfs_rtmodify_summary(mp, tp,
XFS_RTBLOCKLOG(start - preblock),
XFS_BITTOBLOCK(mp, preblock), 1, rbpp, rsb);
if (error) {
return error;
}
}
/*
* If there are blocks not being allocated at the end of the
* old extent, add summary data for them to be free.
*/
if (postblock > end) {
error = xfs_rtmodify_summary(mp, tp,
XFS_RTBLOCKLOG(postblock - end),
XFS_BITTOBLOCK(mp, end + 1), 1, rbpp, rsb);
if (error) {
return error;
}
}
/*
* Modify the bitmap to mark this extent allocated.
*/
error = xfs_rtmodify_range(mp, tp, start, len, 0);
return error;
}
/*
* Return whether there are any free extents in the size range given
* by low and high, for the bitmap block bbno.
*/
STATIC int /* error */
xfs_rtany_summary(
xfs_mount_t *mp, /* file system mount structure */
xfs_trans_t *tp, /* transaction pointer */
int low, /* low log2 extent size */
int high, /* high log2 extent size */
xfs_rtblock_t bbno, /* bitmap block number */
xfs_buf_t **rbpp, /* in/out: summary block buffer */
xfs_fsblock_t *rsb, /* in/out: summary block number */
int *stat) /* out: any good extents here? */
{
int error; /* error value */
int log; /* loop counter, log2 of ext. size */
xfs_suminfo_t sum; /* summary data */
/*
* Loop over logs of extent sizes. Order is irrelevant.
*/
for (log = low; log <= high; log++) {
/*
* Get one summary datum.
*/
error = xfs_rtget_summary(mp, tp, log, bbno, rbpp, rsb, &sum);
if (error) {
return error;
}
/*
* If there are any, return success.
*/
if (sum) {
*stat = 1;
return 0;
}
}
/*
* Found nothing, return failure.
*/
*stat = 0;
return 0;
}
/*
* Get a buffer for the bitmap or summary file block specified.
* The buffer is returned read and locked.
*/
STATIC int /* error */
xfs_rtbuf_get(
xfs_mount_t *mp, /* file system mount structure */
xfs_trans_t *tp, /* transaction pointer */
xfs_rtblock_t block, /* block number in bitmap or summary */
int issum, /* is summary not bitmap */
xfs_buf_t **bpp) /* output: buffer for the block */
{
xfs_buf_t *bp; /* block buffer, result */
xfs_daddr_t d; /* disk addr of block */
int error; /* error value */
xfs_fsblock_t fsb; /* fs block number for block */
xfs_inode_t *ip; /* bitmap or summary inode */
ip = issum ? mp->m_rsumip : mp->m_rbmip;
/*
* Map from the file offset (block) and inode number to the
* file system block.
*/
error = xfs_bmapi_single(tp, ip, XFS_DATA_FORK, &fsb, block);
if (error) {
return error;
}
ASSERT(fsb != NULLFSBLOCK);
/*
* Convert to disk address for buffer cache.
*/
d = XFS_FSB_TO_DADDR(mp, fsb);
/*
* Read the buffer.
*/
error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp, d,
mp->m_bsize, 0, &bp);
if (error) {
return error;
}
ASSERT(bp && !XFS_BUF_GETERROR(bp));
*bpp = bp;
return 0;
}
#ifdef DEBUG
/*
* Check that the given extent (block range) is allocated already.
*/
STATIC int /* error */
xfs_rtcheck_alloc_range(
xfs_mount_t *mp, /* file system mount point */
xfs_trans_t *tp, /* transaction pointer */
xfs_rtblock_t bno, /* starting block number of extent */
xfs_extlen_t len, /* length of extent */
int *stat) /* out: 1 for allocated, 0 for not */
{
xfs_rtblock_t new; /* dummy for xfs_rtcheck_range */
return xfs_rtcheck_range(mp, tp, bno, len, 0, &new, stat);
}
#endif
/*
* Check that the given range is either all allocated (val = 0) or
* all free (val = 1).
*/
STATIC int /* error */
xfs_rtcheck_range(
xfs_mount_t *mp, /* file system mount point */
xfs_trans_t *tp, /* transaction pointer */
xfs_rtblock_t start, /* starting block number of extent */
xfs_extlen_t len, /* length of extent */
int val, /* 1 for free, 0 for allocated */
xfs_rtblock_t *new, /* out: first block not matching */
int *stat) /* out: 1 for matches, 0 for not */
{
xfs_rtword_t *b; /* current word in buffer */
int bit; /* bit number in the word */
xfs_rtblock_t block; /* bitmap block number */
xfs_buf_t *bp; /* buf for the block */
xfs_rtword_t *bufp; /* starting word in buffer */
int error; /* error value */
xfs_rtblock_t i; /* current bit number rel. to start */
xfs_rtblock_t lastbit; /* last useful bit in word */
xfs_rtword_t mask; /* mask of relevant bits for value */
xfs_rtword_t wdiff; /* difference from wanted value */
int word; /* word number in the buffer */
/*
* Compute starting bitmap block number
*/
block = XFS_BITTOBLOCK(mp, start);
/*
* Read the bitmap block.
*/
error = xfs_rtbuf_get(mp, tp, block, 0, &bp);
if (error) {
return error;
}
bufp = (xfs_rtword_t *)XFS_BUF_PTR(bp);
/*
* Compute the starting word's address, and starting bit.
*/
word = XFS_BITTOWORD(mp, start);
b = &bufp[word];
bit = (int)(start & (XFS_NBWORD - 1));
/*
* 0 (allocated) => all zero's; 1 (free) => all one's.
*/
val = -val;
/*
* If not starting on a word boundary, deal with the first
* (partial) word.
*/
if (bit) {
/*
* Compute first bit not examined.
*/
lastbit = XFS_RTMIN(bit + len, XFS_NBWORD);
/*
* Mask of relevant bits.
*/
mask = (((xfs_rtword_t)1 << (lastbit - bit)) - 1) << bit;
/*
* Compute difference between actual and desired value.
*/
if ((wdiff = (*b ^ val) & mask)) {
/*
* Different, compute first wrong bit and return.
*/
xfs_trans_brelse(tp, bp);
i = XFS_RTLOBIT(wdiff) - bit;
*new = start + i;
*stat = 0;
return 0;
}
i = lastbit - bit;
/*
* Go on to next block if that's where the next word is
* and we need the next word.
*/
if (++word == XFS_BLOCKWSIZE(mp) && i < len) {
/*
* If done with this block, get the next one.
*/
xfs_trans_brelse(tp, bp);
error = xfs_rtbuf_get(mp, tp, ++block, 0, &bp);
if (error) {
return error;
}
b = bufp = (xfs_rtword_t *)XFS_BUF_PTR(bp);
word = 0;
} else {
/*
* Go on to the next word in the buffer.
*/
b++;
}
} else {
/*
* Starting on a word boundary, no partial word.
*/
i = 0;
}
/*
* Loop over whole words in buffers. When we use up one buffer
* we move on to the next one.
*/
while (len - i >= XFS_NBWORD) {
/*
* Compute difference between actual and desired value.
*/
if ((wdiff = *b ^ val)) {
/*
* Different, compute first wrong bit and return.
*/
xfs_trans_brelse(tp, bp);
i += XFS_RTLOBIT(wdiff);
*new = start + i;
*stat = 0;
return 0;
}
i += XFS_NBWORD;
/*
* Go on to next block if that's where the next word is
* and we need the next word.
*/
if (++word == XFS_BLOCKWSIZE(mp) && i < len) {
/*
* If done with this block, get the next one.
*/
xfs_trans_brelse(tp, bp);
error = xfs_rtbuf_get(mp, tp, ++block, 0, &bp);
if (error) {
return error;
}
b = bufp = (xfs_rtword_t *)XFS_BUF_PTR(bp);
word = 0;
} else {
/*
* Go on to the next word in the buffer.
*/
b++;
}
}
/*
* If not ending on a word boundary, deal with the last
* (partial) word.
*/
if ((lastbit = len - i)) {
/*
* Mask of relevant bits.
*/
mask = ((xfs_rtword_t)1 << lastbit) - 1;
/*
* Compute difference between actual and desired value.
*/
if ((wdiff = (*b ^ val) & mask)) {
/*
* Different, compute first wrong bit and return.
*/
xfs_trans_brelse(tp, bp);
i += XFS_RTLOBIT(wdiff);
*new = start + i;
*stat = 0;
return 0;
} else
i = len;
}
/*
* Successful, return.
*/
xfs_trans_brelse(tp, bp);
*new = start + i;
*stat = 1;
return 0;
}
/*
* Copy and transform the summary file, given the old and new
* parameters in the mount structures.
*/
STATIC int /* error */
xfs_rtcopy_summary(
xfs_mount_t *omp, /* old file system mount point */
xfs_mount_t *nmp, /* new file system mount point */
xfs_trans_t *tp) /* transaction pointer */
{
xfs_rtblock_t bbno; /* bitmap block number */
xfs_buf_t *bp; /* summary buffer */
int error; /* error return value */
int log; /* summary level number (log length) */
xfs_suminfo_t sum; /* summary data */
xfs_fsblock_t sumbno; /* summary block number */
bp = NULL;
for (log = omp->m_rsumlevels - 1; log >= 0; log--) {
for (bbno = omp->m_sb.sb_rbmblocks - 1;
(xfs_srtblock_t)bbno >= 0;
bbno--) {
error = xfs_rtget_summary(omp, tp, log, bbno, &bp,
&sumbno, &sum);
if (error)
return error;
if (sum == 0)
continue;
error = xfs_rtmodify_summary(omp, tp, log, bbno, -sum,
&bp, &sumbno);
if (error)
return error;
error = xfs_rtmodify_summary(nmp, tp, log, bbno, sum,
&bp, &sumbno);
if (error)
return error;
ASSERT(sum > 0);
}
}
return 0;
}
/*
* Searching backward from start to limit, find the first block whose
* allocated/free state is different from start's.
*/
STATIC int /* error */
xfs_rtfind_back(
xfs_mount_t *mp, /* file system mount point */
xfs_trans_t *tp, /* transaction pointer */
xfs_rtblock_t start, /* starting block to look at */
xfs_rtblock_t limit, /* last block to look at */
xfs_rtblock_t *rtblock) /* out: start block found */
{
xfs_rtword_t *b; /* current word in buffer */
int bit; /* bit number in the word */
xfs_rtblock_t block; /* bitmap block number */
xfs_buf_t *bp; /* buf for the block */
xfs_rtword_t *bufp; /* starting word in buffer */
int error; /* error value */
xfs_rtblock_t firstbit; /* first useful bit in the word */
xfs_rtblock_t i; /* current bit number rel. to start */
xfs_rtblock_t len; /* length of inspected area */
xfs_rtword_t mask; /* mask of relevant bits for value */
xfs_rtword_t want; /* mask for "good" values */
xfs_rtword_t wdiff; /* difference from wanted value */
int word; /* word number in the buffer */
/*
* Compute and read in starting bitmap block for starting block.
*/
block = XFS_BITTOBLOCK(mp, start);
error = xfs_rtbuf_get(mp, tp, block, 0, &bp);
if (error) {
return error;
}
bufp = (xfs_rtword_t *)XFS_BUF_PTR(bp);
/*
* Get the first word's index & point to it.
*/
word = XFS_BITTOWORD(mp, start);
b = &bufp[word];
bit = (int)(start & (XFS_NBWORD - 1));
len = start - limit + 1;
/*
* Compute match value, based on the bit at start: if 1 (free)
* then all-ones, else all-zeroes.
*/
want = (*b & ((xfs_rtword_t)1 << bit)) ? -1 : 0;
/*
* If the starting position is not word-aligned, deal with the
* partial word.
*/
if (bit < XFS_NBWORD - 1) {
/*
* Calculate first (leftmost) bit number to look at,
* and mask for all the relevant bits in this word.
*/
firstbit = XFS_RTMAX((xfs_srtblock_t)(bit - len + 1), 0);
mask = (((xfs_rtword_t)1 << (bit - firstbit + 1)) - 1) <<
firstbit;
/*
* Calculate the difference between the value there
* and what we're looking for.
*/
if ((wdiff = (*b ^ want) & mask)) {
/*
* Different. Mark where we are and return.
*/
xfs_trans_brelse(tp, bp);
i = bit - XFS_RTHIBIT(wdiff);
*rtblock = start - i + 1;
return 0;
}
i = bit - firstbit + 1;
/*
* Go on to previous block if that's where the previous word is
* and we need the previous word.
*/
if (--word == -1 && i < len) {
/*
* If done with this block, get the previous one.
*/
xfs_trans_brelse(tp, bp);
error = xfs_rtbuf_get(mp, tp, --block, 0, &bp);
if (error) {
return error;
}
bufp = (xfs_rtword_t *)XFS_BUF_PTR(bp);
word = XFS_BLOCKWMASK(mp);
b = &bufp[word];
} else {
/*
* Go on to the previous word in the buffer.
*/
b--;
}
} else {
/*
* Starting on a word boundary, no partial word.
*/
i = 0;
}
/*
* Loop over whole words in buffers. When we use up one buffer
* we move on to the previous one.
*/
while (len - i >= XFS_NBWORD) {
/*
* Compute difference between actual and desired value.
*/
if ((wdiff = *b ^ want)) {
/*
* Different, mark where we are and return.
*/
xfs_trans_brelse(tp, bp);
i += XFS_NBWORD - 1 - XFS_RTHIBIT(wdiff);
*rtblock = start - i + 1;
return 0;
}
i += XFS_NBWORD;
/*
* Go on to previous block if that's where the previous word is
* and we need the previous word.
*/
if (--word == -1 && i < len) {
/*
* If done with this block, get the previous one.
*/
xfs_trans_brelse(tp, bp);
error = xfs_rtbuf_get(mp, tp, --block, 0, &bp);
if (error) {
return error;
}
bufp = (xfs_rtword_t *)XFS_BUF_PTR(bp);
word = XFS_BLOCKWMASK(mp);
b = &bufp[word];
} else {
/*
* Go on to the previous word in the buffer.
*/
b--;
}
}
/*
* If not ending on a word boundary, deal with the last
* (partial) word.
*/
if (len - i) {
/*
* Calculate first (leftmost) bit number to look at,
* and mask for all the relevant bits in this word.
*/
firstbit = XFS_NBWORD - (len - i);
mask = (((xfs_rtword_t)1 << (len - i)) - 1) << firstbit;
/*
* Compute difference between actual and desired value.
*/
if ((wdiff = (*b ^ want) & mask)) {
/*
* Different, mark where we are and return.
*/
xfs_trans_brelse(tp, bp);
i += XFS_NBWORD - 1 - XFS_RTHIBIT(wdiff);
*rtblock = start - i + 1;
return 0;
} else
i = len;
}
/*
* No match, return that we scanned the whole area.
*/
xfs_trans_brelse(tp, bp);
*rtblock = start - i + 1;
return 0;
}
/*
* Searching forward from start to limit, find the first block whose
* allocated/free state is different from start's.
*/
STATIC int /* error */
xfs_rtfind_forw(
xfs_mount_t *mp, /* file system mount point */
xfs_trans_t *tp, /* transaction pointer */
xfs_rtblock_t start, /* starting block to look at */
xfs_rtblock_t limit, /* last block to look at */
xfs_rtblock_t *rtblock) /* out: start block found */
{
xfs_rtword_t *b; /* current word in buffer */
int bit; /* bit number in the word */
xfs_rtblock_t block; /* bitmap block number */
xfs_buf_t *bp; /* buf for the block */
xfs_rtword_t *bufp; /* starting word in buffer */
int error; /* error value */
xfs_rtblock_t i; /* current bit number rel. to start */
xfs_rtblock_t lastbit; /* last useful bit in the word */
xfs_rtblock_t len; /* length of inspected area */
xfs_rtword_t mask; /* mask of relevant bits for value */
xfs_rtword_t want; /* mask for "good" values */
xfs_rtword_t wdiff; /* difference from wanted value */
int word; /* word number in the buffer */
/*
* Compute and read in starting bitmap block for starting block.
*/
block = XFS_BITTOBLOCK(mp, start);
error = xfs_rtbuf_get(mp, tp, block, 0, &bp);
if (error) {
return error;
}
bufp = (xfs_rtword_t *)XFS_BUF_PTR(bp);
/*
* Get the first word's index & point to it.
*/
word = XFS_BITTOWORD(mp, start);
b = &bufp[word];
bit = (int)(start & (XFS_NBWORD - 1));
len = limit - start + 1;
/*
* Compute match value, based on the bit at start: if 1 (free)
* then all-ones, else all-zeroes.
*/
want = (*b & ((xfs_rtword_t)1 << bit)) ? -1 : 0;
/*
* If the starting position is not word-aligned, deal with the
* partial word.
*/
if (bit) {
/*
* Calculate last (rightmost) bit number to look at,
* and mask for all the relevant bits in this word.
*/
lastbit = XFS_RTMIN(bit + len, XFS_NBWORD);
mask = (((xfs_rtword_t)1 << (lastbit - bit)) - 1) << bit;
/*
* Calculate the difference between the value there
* and what we're looking for.
*/
if ((wdiff = (*b ^ want) & mask)) {
/*
* Different. Mark where we are and return.
*/
xfs_trans_brelse(tp, bp);
i = XFS_RTLOBIT(wdiff) - bit;
*rtblock = start + i - 1;
return 0;
}
i = lastbit - bit;
/*
* Go on to next block if that's where the next word is
* and we need the next word.
*/
if (++word == XFS_BLOCKWSIZE(mp) && i < len) {
/*
* If done with this block, get the previous one.
*/
xfs_trans_brelse(tp, bp);
error = xfs_rtbuf_get(mp, tp, ++block, 0, &bp);
if (error) {
return error;
}
b = bufp = (xfs_rtword_t *)XFS_BUF_PTR(bp);
word = 0;
} else {
/*
* Go on to the previous word in the buffer.
*/
b++;
}
} else {
/*
* Starting on a word boundary, no partial word.
*/
i = 0;
}
/*
* Loop over whole words in buffers. When we use up one buffer
* we move on to the next one.
*/
while (len - i >= XFS_NBWORD) {
/*
* Compute difference between actual and desired value.
*/
if ((wdiff = *b ^ want)) {
/*
* Different, mark where we are and return.
*/
xfs_trans_brelse(tp, bp);
i += XFS_RTLOBIT(wdiff);
*rtblock = start + i - 1;
return 0;
}
i += XFS_NBWORD;
/*
* Go on to next block if that's where the next word is
* and we need the next word.
*/
if (++word == XFS_BLOCKWSIZE(mp) && i < len) {
/*
* If done with this block, get the next one.
*/
xfs_trans_brelse(tp, bp);
error = xfs_rtbuf_get(mp, tp, ++block, 0, &bp);
if (error) {
return error;
}
b = bufp = (xfs_rtword_t *)XFS_BUF_PTR(bp);
word = 0;
} else {
/*
* Go on to the next word in the buffer.
*/
b++;
}
}
/*
* If not ending on a word boundary, deal with the last
* (partial) word.
*/
if ((lastbit = len - i)) {
/*
* Calculate mask for all the relevant bits in this word.
*/
mask = ((xfs_rtword_t)1 << lastbit) - 1;
/*
* Compute difference between actual and desired value.
*/
if ((wdiff = (*b ^ want) & mask)) {
/*
* Different, mark where we are and return.
*/
xfs_trans_brelse(tp, bp);
i += XFS_RTLOBIT(wdiff);
*rtblock = start + i - 1;
return 0;
} else
i = len;
}
/*
* No match, return that we scanned the whole area.
*/
xfs_trans_brelse(tp, bp);
*rtblock = start + i - 1;
return 0;
}
/*
* Mark an extent specified by start and len freed.
* Updates all the summary information as well as the bitmap.
*/
STATIC int /* error */
xfs_rtfree_range(
xfs_mount_t *mp, /* file system mount point */
xfs_trans_t *tp, /* transaction pointer */
xfs_rtblock_t start, /* starting block to free */
xfs_extlen_t len, /* length to free */
xfs_buf_t **rbpp, /* in/out: summary block buffer */
xfs_fsblock_t *rsb) /* in/out: summary block number */
{
xfs_rtblock_t end; /* end of the freed extent */
int error; /* error value */
xfs_rtblock_t postblock; /* first block freed > end */
xfs_rtblock_t preblock; /* first block freed < start */
end = start + len - 1;
/*
* Modify the bitmap to mark this extent freed.
*/
error = xfs_rtmodify_range(mp, tp, start, len, 1);
if (error) {
return error;
}
/*
* Assume we're freeing out of the middle of an allocated extent.
* We need to find the beginning and end of the extent so we can
* properly update the summary.
*/
error = xfs_rtfind_back(mp, tp, start, 0, &preblock);
if (error) {
return error;
}
/*
* Find the next allocated block (end of allocated extent).
*/
error = xfs_rtfind_forw(mp, tp, end, mp->m_sb.sb_rextents - 1,
&postblock);
/*
* If there are blocks not being freed at the front of the
* old extent, add summary data for them to be allocated.
*/
if (preblock < start) {
error = xfs_rtmodify_summary(mp, tp,
XFS_RTBLOCKLOG(start - preblock),
XFS_BITTOBLOCK(mp, preblock), -1, rbpp, rsb);
if (error) {
return error;
}
}
/*
* If there are blocks not being freed at the end of the
* old extent, add summary data for them to be allocated.
*/
if (postblock > end) {
error = xfs_rtmodify_summary(mp, tp,
XFS_RTBLOCKLOG(postblock - end),
XFS_BITTOBLOCK(mp, end + 1), -1, rbpp, rsb);
if (error) {
return error;
}
}
/*
* Increment the summary information corresponding to the entire
* (new) free extent.
*/
error = xfs_rtmodify_summary(mp, tp,
XFS_RTBLOCKLOG(postblock + 1 - preblock),
XFS_BITTOBLOCK(mp, preblock), 1, rbpp, rsb);
return error;
}
/*
* Read and return the summary information for a given extent size,
* bitmap block combination.
* Keeps track of a current summary block, so we don't keep reading
* it from the buffer cache.
*/
STATIC int /* error */
xfs_rtget_summary(
xfs_mount_t *mp, /* file system mount structure */
xfs_trans_t *tp, /* transaction pointer */
int log, /* log2 of extent size */
xfs_rtblock_t bbno, /* bitmap block number */
xfs_buf_t **rbpp, /* in/out: summary block buffer */
xfs_fsblock_t *rsb, /* in/out: summary block number */
xfs_suminfo_t *sum) /* out: summary info for this block */
{
xfs_buf_t *bp; /* buffer for summary block */
int error; /* error value */
xfs_fsblock_t sb; /* summary fsblock */
int so; /* index into the summary file */
xfs_suminfo_t *sp; /* pointer to returned data */
/*
* Compute entry number in the summary file.
*/
so = XFS_SUMOFFS(mp, log, bbno);
/*
* Compute the block number in the summary file.
*/
sb = XFS_SUMOFFSTOBLOCK(mp, so);
/*
* If we have an old buffer, and the block number matches, use that.
*/
if (rbpp && *rbpp && *rsb == sb)
bp = *rbpp;
/*
* Otherwise we have to get the buffer.
*/
else {
/*
* If there was an old one, get rid of it first.
*/
if (rbpp && *rbpp)
xfs_trans_brelse(tp, *rbpp);
error = xfs_rtbuf_get(mp, tp, sb, 1, &bp);
if (error) {
return error;
}
/*
* Remember this buffer and block for the next call.
*/
if (rbpp) {
*rbpp = bp;
*rsb = sb;
}
}
/*
* Point to the summary information & copy it out.
*/
sp = XFS_SUMPTR(mp, bp, so);
*sum = *sp;
/*
* Drop the buffer if we're not asked to remember it.
*/
if (!rbpp)
xfs_trans_brelse(tp, bp);
return 0;
}
/*
* Set the given range of bitmap bits to the given value.
* Do whatever I/O and logging is required.
*/
STATIC int /* error */
xfs_rtmodify_range(
xfs_mount_t *mp, /* file system mount point */
xfs_trans_t *tp, /* transaction pointer */
xfs_rtblock_t start, /* starting block to modify */
xfs_extlen_t len, /* length of extent to modify */
int val) /* 1 for free, 0 for allocated */
{
xfs_rtword_t *b; /* current word in buffer */
int bit; /* bit number in the word */
xfs_rtblock_t block; /* bitmap block number */
xfs_buf_t *bp; /* buf for the block */
xfs_rtword_t *bufp; /* starting word in buffer */
int error; /* error value */
xfs_rtword_t *first; /* first used word in the buffer */
int i; /* current bit number rel. to start */
int lastbit; /* last useful bit in word */
xfs_rtword_t mask; /* mask o frelevant bits for value */
int word; /* word number in the buffer */
/*
* Compute starting bitmap block number.
*/
block = XFS_BITTOBLOCK(mp, start);
/*
* Read the bitmap block, and point to its data.
*/
error = xfs_rtbuf_get(mp, tp, block, 0, &bp);
if (error) {
return error;
}
bufp = (xfs_rtword_t *)XFS_BUF_PTR(bp);
/*
* Compute the starting word's address, and starting bit.
*/
word = XFS_BITTOWORD(mp, start);
first = b = &bufp[word];
bit = (int)(start & (XFS_NBWORD - 1));
/*
* 0 (allocated) => all zeroes; 1 (free) => all ones.
*/
val = -val;
/*
* If not starting on a word boundary, deal with the first
* (partial) word.
*/
if (bit) {
/*
* Compute first bit not changed and mask of relevant bits.
*/
lastbit = XFS_RTMIN(bit + len, XFS_NBWORD);
mask = (((xfs_rtword_t)1 << (lastbit - bit)) - 1) << bit;
/*
* Set/clear the active bits.
*/
if (val)
*b |= mask;
else
*b &= ~mask;
i = lastbit - bit;
/*
* Go on to the next block if that's where the next word is
* and we need the next word.
*/
if (++word == XFS_BLOCKWSIZE(mp) && i < len) {
/*
* Log the changed part of this block.
* Get the next one.
*/
xfs_trans_log_buf(tp, bp,
(uint)((char *)first - (char *)bufp),
(uint)((char *)b - (char *)bufp));
error = xfs_rtbuf_get(mp, tp, ++block, 0, &bp);
if (error) {
return error;
}
first = b = bufp = (xfs_rtword_t *)XFS_BUF_PTR(bp);
word = 0;
} else {
/*
* Go on to the next word in the buffer
*/
b++;
}
} else {
/*
* Starting on a word boundary, no partial word.
*/
i = 0;
}
/*
* Loop over whole words in buffers. When we use up one buffer
* we move on to the next one.
*/
while (len - i >= XFS_NBWORD) {
/*
* Set the word value correctly.
*/
*b = val;
i += XFS_NBWORD;
/*
* Go on to the next block if that's where the next word is
* and we need the next word.
*/
if (++word == XFS_BLOCKWSIZE(mp) && i < len) {
/*
* Log the changed part of this block.
* Get the next one.
*/
xfs_trans_log_buf(tp, bp,
(uint)((char *)first - (char *)bufp),
(uint)((char *)b - (char *)bufp));
error = xfs_rtbuf_get(mp, tp, ++block, 0, &bp);
if (error) {
return error;
}
first = b = bufp = (xfs_rtword_t *)XFS_BUF_PTR(bp);
word = 0;
} else {
/*
* Go on to the next word in the buffer
*/
b++;
}
}
/*
* If not ending on a word boundary, deal with the last
* (partial) word.
*/
if ((lastbit = len - i)) {
/*
* Compute a mask of relevant bits.
*/
bit = 0;
mask = ((xfs_rtword_t)1 << lastbit) - 1;
/*
* Set/clear the active bits.
*/
if (val)
*b |= mask;
else
*b &= ~mask;
b++;
}
/*
* Log any remaining changed bytes.
*/
if (b > first)
xfs_trans_log_buf(tp, bp, (uint)((char *)first - (char *)bufp),
(uint)((char *)b - (char *)bufp - 1));
return 0;
}
/*
* Read and modify the summary information for a given extent size,
* bitmap block combination.
* Keeps track of a current summary block, so we don't keep reading
* it from the buffer cache.
*/
STATIC int /* error */
xfs_rtmodify_summary(
xfs_mount_t *mp, /* file system mount point */
xfs_trans_t *tp, /* transaction pointer */
int log, /* log2 of extent size */
xfs_rtblock_t bbno, /* bitmap block number */
int delta, /* change to make to summary info */
xfs_buf_t **rbpp, /* in/out: summary block buffer */
xfs_fsblock_t *rsb) /* in/out: summary block number */
{
xfs_buf_t *bp; /* buffer for the summary block */
int error; /* error value */
xfs_fsblock_t sb; /* summary fsblock */
int so; /* index into the summary file */
xfs_suminfo_t *sp; /* pointer to returned data */
/*
* Compute entry number in the summary file.
*/
so = XFS_SUMOFFS(mp, log, bbno);
/*
* Compute the block number in the summary file.
*/
sb = XFS_SUMOFFSTOBLOCK(mp, so);
/*
* If we have an old buffer, and the block number matches, use that.
*/
if (rbpp && *rbpp && *rsb == sb)
bp = *rbpp;
/*
* Otherwise we have to get the buffer.
*/
else {
/*
* If there was an old one, get rid of it first.
*/
if (rbpp && *rbpp)
xfs_trans_brelse(tp, *rbpp);
error = xfs_rtbuf_get(mp, tp, sb, 1, &bp);
if (error) {
return error;
}
/*
* Remember this buffer and block for the next call.
*/
if (rbpp) {
*rbpp = bp;
*rsb = sb;
}
}
/*
* Point to the summary information, modify and log it.
*/
sp = XFS_SUMPTR(mp, bp, so);
*sp += delta;
xfs_trans_log_buf(tp, bp, (uint)((char *)sp - (char *)XFS_BUF_PTR(bp)),
(uint)((char *)sp - (char *)XFS_BUF_PTR(bp) + sizeof(*sp) - 1));
return 0;
}
/*
* Visible (exported) functions.
*/
/*
* Grow the realtime area of the filesystem.
*/
int
xfs_growfs_rt(
xfs_mount_t *mp, /* mount point for filesystem */
xfs_growfs_rt_t *in) /* growfs rt input struct */
{
xfs_rtblock_t bmbno; /* bitmap block number */
xfs_buf_t *bp; /* temporary buffer */
int cancelflags; /* flags for xfs_trans_cancel */
int error; /* error return value */
xfs_inode_t *ip; /* bitmap inode, used as lock */
xfs_mount_t *nmp; /* new (fake) mount structure */
xfs_drfsbno_t nrblocks; /* new number of realtime blocks */
xfs_extlen_t nrbmblocks; /* new number of rt bitmap blocks */
xfs_drtbno_t nrextents; /* new number of realtime extents */
uint8_t nrextslog; /* new log2 of sb_rextents */
xfs_extlen_t nrsumblocks; /* new number of summary blocks */
uint nrsumlevels; /* new rt summary levels */
uint nrsumsize; /* new size of rt summary, bytes */
xfs_sb_t *nsbp; /* new superblock */
xfs_extlen_t rbmblocks; /* current number of rt bitmap blocks */
xfs_extlen_t rsumblocks; /* current number of rt summary blks */
xfs_sb_t *sbp; /* old superblock */
xfs_fsblock_t sumbno; /* summary block number */
xfs_trans_t *tp; /* transaction pointer */
sbp = &mp->m_sb;
/*
* Initial error checking.
*/
if (mp->m_rtdev_targp == NULL || mp->m_rbmip == NULL ||
(nrblocks = in->newblocks) <= sbp->sb_rblocks ||
(sbp->sb_rblocks && (in->extsize != sbp->sb_rextsize)))
return XFS_ERROR(EINVAL);
if ((error = xfs_sb_validate_fsb_count(sbp, nrblocks)))
return error;
/*
* Read in the last block of the device, make sure it exists.
*/
error = xfs_read_buf(mp, mp->m_rtdev_targp,
XFS_FSB_TO_BB(mp, nrblocks - 1),
XFS_FSB_TO_BB(mp, 1), 0, &bp);
if (error)
return error;
ASSERT(bp);
xfs_buf_relse(bp);
/*
* Calculate new parameters. These are the final values to be reached.
*/
nrextents = nrblocks;
do_div(nrextents, in->extsize);
nrbmblocks = howmany_64(nrextents, NBBY * sbp->sb_blocksize);
nrextslog = xfs_highbit32(nrextents);
nrsumlevels = nrextslog + 1;
nrsumsize = (uint)sizeof(xfs_suminfo_t) * nrsumlevels * nrbmblocks;
nrsumblocks = XFS_B_TO_FSB(mp, nrsumsize);
nrsumsize = XFS_FSB_TO_B(mp, nrsumblocks);
/*
* New summary size can't be more than half the size of
* the log. This prevents us from getting a log overflow,
* since we'll log basically the whole summary file at once.
*/
if (nrsumblocks > (mp->m_sb.sb_logblocks >> 1))
return XFS_ERROR(EINVAL);
/*
* Get the old block counts for bitmap and summary inodes.
* These can't change since other growfs callers are locked out.
*/
rbmblocks = XFS_B_TO_FSB(mp, mp->m_rbmip->i_d.di_size);
rsumblocks = XFS_B_TO_FSB(mp, mp->m_rsumip->i_d.di_size);
/*
* Allocate space to the bitmap and summary files, as necessary.
*/
if ((error = xfs_growfs_rt_alloc(mp, rbmblocks, nrbmblocks,
mp->m_sb.sb_rbmino)))
return error;
if ((error = xfs_growfs_rt_alloc(mp, rsumblocks, nrsumblocks,
mp->m_sb.sb_rsumino)))
return error;
/*
* Allocate a new (fake) mount/sb.
*/
nmp = kmem_alloc(sizeof(*nmp), KM_SLEEP);
/*
* Loop over the bitmap blocks.
* We will do everything one bitmap block at a time.
* Skip the current block if it is exactly full.
* This also deals with the case where there were no rtextents before.
*/
for (bmbno = sbp->sb_rbmblocks -
((sbp->sb_rextents & ((1 << mp->m_blkbit_log) - 1)) != 0);
bmbno < nrbmblocks;
bmbno++) {
*nmp = *mp;
nsbp = &nmp->m_sb;
/*
* Calculate new sb and mount fields for this round.
*/
nsbp->sb_rextsize = in->extsize;
nsbp->sb_rbmblocks = bmbno + 1;
nsbp->sb_rblocks =
XFS_RTMIN(nrblocks,
nsbp->sb_rbmblocks * NBBY *
nsbp->sb_blocksize * nsbp->sb_rextsize);
nsbp->sb_rextents = nsbp->sb_rblocks;
do_div(nsbp->sb_rextents, nsbp->sb_rextsize);
nsbp->sb_rextslog = xfs_highbit32(nsbp->sb_rextents);
nrsumlevels = nmp->m_rsumlevels = nsbp->sb_rextslog + 1;
nrsumsize =
(uint)sizeof(xfs_suminfo_t) * nrsumlevels *
nsbp->sb_rbmblocks;
nrsumblocks = XFS_B_TO_FSB(mp, nrsumsize);
nmp->m_rsumsize = nrsumsize = XFS_FSB_TO_B(mp, nrsumblocks);
/*
* Start a transaction, get the log reservation.
*/
tp = xfs_trans_alloc(mp, XFS_TRANS_GROWFSRT_FREE);
cancelflags = 0;
if ((error = xfs_trans_reserve(tp, 0,
XFS_GROWRTFREE_LOG_RES(nmp), 0, 0, 0)))
break;
/*
* Lock out other callers by grabbing the bitmap inode lock.
*/
if ((error = xfs_trans_iget(mp, tp, mp->m_sb.sb_rbmino, 0,
XFS_ILOCK_EXCL, &ip)))
break;
ASSERT(ip == mp->m_rbmip);
/*
* Update the bitmap inode's size.
*/
mp->m_rbmip->i_d.di_size =
nsbp->sb_rbmblocks * nsbp->sb_blocksize;
xfs_trans_log_inode(tp, mp->m_rbmip, XFS_ILOG_CORE);
cancelflags |= XFS_TRANS_ABORT;
/*
* Get the summary inode into the transaction.
*/
if ((error = xfs_trans_iget(mp, tp, mp->m_sb.sb_rsumino, 0,
XFS_ILOCK_EXCL, &ip)))
break;
ASSERT(ip == mp->m_rsumip);
/*
* Update the summary inode's size.
*/
mp->m_rsumip->i_d.di_size = nmp->m_rsumsize;
xfs_trans_log_inode(tp, mp->m_rsumip, XFS_ILOG_CORE);
/*
* Copy summary data from old to new sizes.
* Do this when the real size (not block-aligned) changes.
*/
if (sbp->sb_rbmblocks != nsbp->sb_rbmblocks ||
mp->m_rsumlevels != nmp->m_rsumlevels) {
error = xfs_rtcopy_summary(mp, nmp, tp);
if (error)
break;
}
/*
* Update superblock fields.
*/
if (nsbp->sb_rextsize != sbp->sb_rextsize)
xfs_trans_mod_sb(tp, XFS_TRANS_SB_REXTSIZE,
nsbp->sb_rextsize - sbp->sb_rextsize);
if (nsbp->sb_rbmblocks != sbp->sb_rbmblocks)
xfs_trans_mod_sb(tp, XFS_TRANS_SB_RBMBLOCKS,
nsbp->sb_rbmblocks - sbp->sb_rbmblocks);
if (nsbp->sb_rblocks != sbp->sb_rblocks)
xfs_trans_mod_sb(tp, XFS_TRANS_SB_RBLOCKS,
nsbp->sb_rblocks - sbp->sb_rblocks);
if (nsbp->sb_rextents != sbp->sb_rextents)
xfs_trans_mod_sb(tp, XFS_TRANS_SB_REXTENTS,
nsbp->sb_rextents - sbp->sb_rextents);
if (nsbp->sb_rextslog != sbp->sb_rextslog)
xfs_trans_mod_sb(tp, XFS_TRANS_SB_REXTSLOG,
nsbp->sb_rextslog - sbp->sb_rextslog);
/*
* Free new extent.
*/
bp = NULL;
error = xfs_rtfree_range(nmp, tp, sbp->sb_rextents,
nsbp->sb_rextents - sbp->sb_rextents, &bp, &sumbno);
if (error)
break;
/*
* Mark more blocks free in the superblock.
*/
xfs_trans_mod_sb(tp, XFS_TRANS_SB_FREXTENTS,
nsbp->sb_rextents - sbp->sb_rextents);
/*
* Update mp values into the real mp structure.
*/
mp->m_rsumlevels = nrsumlevels;
mp->m_rsumsize = nrsumsize;
/*
* Commit the transaction.
*/
xfs_trans_commit(tp, 0);
}
if (error)
xfs_trans_cancel(tp, cancelflags);
/*
* Free the fake mp structure.
*/
kmem_free(nmp, sizeof(*nmp));
return error;
}
/*
* Allocate an extent in the realtime subvolume, with the usual allocation
* parameters. The length units are all in realtime extents, as is the
* result block number.
*/
int /* error */
xfs_rtallocate_extent(
xfs_trans_t *tp, /* transaction pointer */
xfs_rtblock_t bno, /* starting block number to allocate */
xfs_extlen_t minlen, /* minimum length to allocate */
xfs_extlen_t maxlen, /* maximum length to allocate */
xfs_extlen_t *len, /* out: actual length allocated */
xfs_alloctype_t type, /* allocation type XFS_ALLOCTYPE... */
int wasdel, /* was a delayed allocation extent */
xfs_extlen_t prod, /* extent product factor */
xfs_rtblock_t *rtblock) /* out: start block allocated */
{
int error; /* error value */
xfs_inode_t *ip; /* inode for bitmap file */
xfs_mount_t *mp; /* file system mount structure */
xfs_rtblock_t r; /* result allocated block */
xfs_fsblock_t sb; /* summary file block number */
xfs_buf_t *sumbp; /* summary file block buffer */
ASSERT(minlen > 0 && minlen <= maxlen);
mp = tp->t_mountp;
/*
* If prod is set then figure out what to do to minlen and maxlen.
*/
if (prod > 1) {
xfs_extlen_t i;
if ((i = maxlen % prod))
maxlen -= i;
if ((i = minlen % prod))
minlen += prod - i;
if (maxlen < minlen) {
*rtblock = NULLRTBLOCK;
return 0;
}
}
/*
* Lock out other callers by grabbing the bitmap inode lock.
*/
if ((error = xfs_trans_iget(mp, tp, mp->m_sb.sb_rbmino, 0,
XFS_ILOCK_EXCL, &ip)))
return error;
sumbp = NULL;
/*
* Allocate by size, or near another block, or exactly at some block.
*/
switch (type) {
case XFS_ALLOCTYPE_ANY_AG:
error = xfs_rtallocate_extent_size(mp, tp, minlen, maxlen, len,
&sumbp, &sb, prod, &r);
break;
case XFS_ALLOCTYPE_NEAR_BNO:
error = xfs_rtallocate_extent_near(mp, tp, bno, minlen, maxlen,
len, &sumbp, &sb, prod, &r);
break;
case XFS_ALLOCTYPE_THIS_BNO:
error = xfs_rtallocate_extent_exact(mp, tp, bno, minlen, maxlen,
len, &sumbp, &sb, prod, &r);
break;
default:
ASSERT(0);
}
if (error) {
return error;
}
/*
* If it worked, update the superblock.
*/
if (r != NULLRTBLOCK) {
long slen = (long)*len;
ASSERT(*len >= minlen && *len <= maxlen);
if (wasdel)
xfs_trans_mod_sb(tp, XFS_TRANS_SB_RES_FREXTENTS, -slen);
else
xfs_trans_mod_sb(tp, XFS_TRANS_SB_FREXTENTS, -slen);
}
*rtblock = r;
return 0;
}
/*
* Free an extent in the realtime subvolume. Length is expressed in
* realtime extents, as is the block number.
*/
int /* error */
xfs_rtfree_extent(
xfs_trans_t *tp, /* transaction pointer */
xfs_rtblock_t bno, /* starting block number to free */
xfs_extlen_t len) /* length of extent freed */
{
int error; /* error value */
xfs_inode_t *ip; /* bitmap file inode */
xfs_mount_t *mp; /* file system mount structure */
xfs_fsblock_t sb; /* summary file block number */
xfs_buf_t *sumbp; /* summary file block buffer */
mp = tp->t_mountp;
/*
* Synchronize by locking the bitmap inode.
*/
if ((error = xfs_trans_iget(mp, tp, mp->m_sb.sb_rbmino, 0,
XFS_ILOCK_EXCL, &ip)))
return error;
#if defined(__KERNEL__) && defined(DEBUG)
/*
* Check to see that this whole range is currently allocated.
*/
{
int stat; /* result from checking range */
error = xfs_rtcheck_alloc_range(mp, tp, bno, len, &stat);
if (error) {
return error;
}
ASSERT(stat);
}
#endif
sumbp = NULL;
/*
* Free the range of realtime blocks.
*/
error = xfs_rtfree_range(mp, tp, bno, len, &sumbp, &sb);
if (error) {
return error;
}
/*
* Mark more blocks free in the superblock.
*/
xfs_trans_mod_sb(tp, XFS_TRANS_SB_FREXTENTS, (long)len);
/*
* If we've now freed all the blocks, reset the file sequence
* number to 0.
*/
if (tp->t_frextents_delta + mp->m_sb.sb_frextents ==
mp->m_sb.sb_rextents) {
if (!(ip->i_d.di_flags & XFS_DIFLAG_NEWRTBM))
ip->i_d.di_flags |= XFS_DIFLAG_NEWRTBM;
*(__uint64_t *)&ip->i_d.di_atime = 0;
xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
}
return 0;
}
/*
* Initialize realtime fields in the mount structure.
*/
int /* error */
xfs_rtmount_init(
xfs_mount_t *mp) /* file system mount structure */
{
xfs_buf_t *bp; /* buffer for last block of subvolume */
xfs_daddr_t d; /* address of last block of subvolume */
int error; /* error return value */
xfs_sb_t *sbp; /* filesystem superblock copy in mount */
sbp = &mp->m_sb;
if (sbp->sb_rblocks == 0)
return 0;
if (mp->m_rtdev_targp == NULL) {
cmn_err(CE_WARN,
"XFS: This filesystem has a realtime volume, use rtdev=device option");
return XFS_ERROR(ENODEV);
}
mp->m_rsumlevels = sbp->sb_rextslog + 1;
mp->m_rsumsize =
(uint)sizeof(xfs_suminfo_t) * mp->m_rsumlevels *
sbp->sb_rbmblocks;
mp->m_rsumsize = roundup(mp->m_rsumsize, sbp->sb_blocksize);
mp->m_rbmip = mp->m_rsumip = NULL;
/*
* Check that the realtime section is an ok size.
*/
d = (xfs_daddr_t)XFS_FSB_TO_BB(mp, mp->m_sb.sb_rblocks);
if (XFS_BB_TO_FSB(mp, d) != mp->m_sb.sb_rblocks) {
cmn_err(CE_WARN, "XFS: realtime mount -- %llu != %llu",
(unsigned long long) XFS_BB_TO_FSB(mp, d),
(unsigned long long) mp->m_sb.sb_rblocks);
return XFS_ERROR(E2BIG);
}
error = xfs_read_buf(mp, mp->m_rtdev_targp,
d - XFS_FSB_TO_BB(mp, 1),
XFS_FSB_TO_BB(mp, 1), 0, &bp);
if (error) {
cmn_err(CE_WARN,
"XFS: realtime mount -- xfs_read_buf failed, returned %d", error);
if (error == ENOSPC)
return XFS_ERROR(E2BIG);
return error;
}
xfs_buf_relse(bp);
return 0;
}
/*
* Get the bitmap and summary inodes into the mount structure
* at mount time.
*/
int /* error */
xfs_rtmount_inodes(
xfs_mount_t *mp) /* file system mount structure */
{
int error; /* error return value */
xfs_sb_t *sbp;
sbp = &mp->m_sb;
if (sbp->sb_rbmino == NULLFSINO)
return 0;
error = xfs_iget(mp, NULL, sbp->sb_rbmino, 0, 0, &mp->m_rbmip, 0);
if (error)
return error;
ASSERT(mp->m_rbmip != NULL);
ASSERT(sbp->sb_rsumino != NULLFSINO);
error = xfs_iget(mp, NULL, sbp->sb_rsumino, 0, 0, &mp->m_rsumip, 0);
if (error) {
VN_RELE(XFS_ITOV(mp->m_rbmip));
return error;
}
ASSERT(mp->m_rsumip != NULL);
return 0;
}
/*
* Pick an extent for allocation at the start of a new realtime file.
* Use the sequence number stored in the atime field of the bitmap inode.
* Translate this to a fraction of the rtextents, and return the product
* of rtextents and the fraction.
* The fraction sequence is 0, 1/2, 1/4, 3/4, 1/8, ..., 7/8, 1/16, ...
*/
int /* error */
xfs_rtpick_extent(
xfs_mount_t *mp, /* file system mount point */
xfs_trans_t *tp, /* transaction pointer */
xfs_extlen_t len, /* allocation length (rtextents) */
xfs_rtblock_t *pick) /* result rt extent */
{
xfs_rtblock_t b; /* result block */
int error; /* error return value */
xfs_inode_t *ip; /* bitmap incore inode */
int log2; /* log of sequence number */
__uint64_t resid; /* residual after log removed */
__uint64_t seq; /* sequence number of file creation */
__uint64_t *seqp; /* pointer to seqno in inode */
if ((error = xfs_trans_iget(mp, tp, mp->m_sb.sb_rbmino, 0,
XFS_ILOCK_EXCL, &ip)))
return error;
ASSERT(ip == mp->m_rbmip);
seqp = (__uint64_t *)&ip->i_d.di_atime;
if (!(ip->i_d.di_flags & XFS_DIFLAG_NEWRTBM)) {
ip->i_d.di_flags |= XFS_DIFLAG_NEWRTBM;
*seqp = 0;
}
seq = *seqp;
if ((log2 = xfs_highbit64(seq)) == -1)
b = 0;
else {
resid = seq - (1ULL << log2);
b = (mp->m_sb.sb_rextents * ((resid << 1) + 1ULL)) >>
(log2 + 1);
if (b >= mp->m_sb.sb_rextents)
b = do_mod(b, mp->m_sb.sb_rextents);
if (b + len > mp->m_sb.sb_rextents)
b = mp->m_sb.sb_rextents - len;
}
*seqp = seq + 1;
xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
*pick = b;
return 0;
}
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