// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2000-2005 Silicon Graphics, Inc.
* All Rights Reserved.
*/
#include "xfs.h"
#include "xfs_fs.h"
#include "xfs_shared.h"
#include "xfs_format.h"
#include "xfs_log_format.h"
#include "xfs_trans_resv.h"
#include "xfs_bit.h"
#include "xfs_mount.h"
#include "xfs_inode.h"
#include "xfs_alloc.h"
#include "xfs_bmap.h"
#include "xfs_bmap_btree.h"
#include "xfs_bmap_util.h"
#include "xfs_trans.h"
#include "xfs_trans_space.h"
#include "xfs_icache.h"
#include "xfs_rtalloc.h"
#include "xfs_sb.h"
#include "xfs_rtbitmap.h"
#include "xfs_quota.h"
#include "xfs_log_priv.h"
#include "xfs_health.h"
/*
* Return whether there are any free extents in the size range given
* by low and high, for the bitmap block bbno.
*/
STATIC int
xfs_rtany_summary(
struct xfs_rtalloc_args *args,
int low, /* low log2 extent size */
int high, /* high log2 extent size */
xfs_fileoff_t bbno, /* bitmap block number */
int *maxlog) /* out: max log2 extent size free */
{
struct xfs_mount *mp = args->mp;
int error;
int log; /* loop counter, log2 of ext. size */
xfs_suminfo_t sum; /* summary data */
/* There are no extents at levels >= m_rsum_cache[bbno]. */
if (mp->m_rsum_cache) {
high = min(high, mp->m_rsum_cache[bbno] - 1);
if (low > high) {
*maxlog = -1;
return 0;
}
}
/*
* Loop over logs of extent sizes.
*/
for (log = high; log >= low; log--) {
/*
* Get one summary datum.
*/
error = xfs_rtget_summary(args, log, bbno, &sum);
if (error) {
return error;
}
/*
* If there are any, return success.
*/
if (sum) {
*maxlog = log;
goto out;
}
}
/*
* Found nothing, return failure.
*/
*maxlog = -1;
out:
/* There were no extents at levels > log. */
if (mp->m_rsum_cache && log + 1 < mp->m_rsum_cache[bbno])
mp->m_rsum_cache[bbno] = log + 1;
return 0;
}
/*
* Copy and transform the summary file, given the old and new
* parameters in the mount structures.
*/
STATIC int
xfs_rtcopy_summary(
struct xfs_rtalloc_args *oargs,
struct xfs_rtalloc_args *nargs)
{
xfs_fileoff_t bbno; /* bitmap block number */
int error;
int log; /* summary level number (log length) */
xfs_suminfo_t sum; /* summary data */
for (log = oargs->mp->m_rsumlevels - 1; log >= 0; log--) {
for (bbno = oargs->mp->m_sb.sb_rbmblocks - 1;
(xfs_srtblock_t)bbno >= 0;
bbno--) {
error = xfs_rtget_summary(oargs, log, bbno, &sum);
if (error)
goto out;
if (sum == 0)
continue;
error = xfs_rtmodify_summary(oargs, log, bbno, -sum);
if (error)
goto out;
error = xfs_rtmodify_summary(nargs, log, bbno, sum);
if (error)
goto out;
ASSERT(sum > 0);
}
}
error = 0;
out:
xfs_rtbuf_cache_relse(oargs);
return 0;
}
/*
* Mark an extent specified by start and len allocated.
* Updates all the summary information as well as the bitmap.
*/
STATIC int
xfs_rtallocate_range(
struct xfs_rtalloc_args *args,
xfs_rtxnum_t start, /* start rtext to allocate */
xfs_rtxlen_t len) /* in/out: summary block number */
{
struct xfs_mount *mp = args->mp;
xfs_rtxnum_t end; /* end of the allocated rtext */
int error;
xfs_rtxnum_t postblock = 0; /* first rtext allocated > end */
xfs_rtxnum_t preblock = 0; /* first rtext 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(args, start, &preblock);
if (error)
return error;
/*
* Find the next allocated block (end of free extent).
*/
error = xfs_rtfind_forw(args, 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(args,
xfs_highbit64(postblock + 1 - preblock),
xfs_rtx_to_rbmblock(mp, preblock), -1);
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(args,
xfs_highbit64(start - preblock),
xfs_rtx_to_rbmblock(mp, preblock), 1);
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(args,
xfs_highbit64(postblock - end),
xfs_rtx_to_rbmblock(mp, end + 1), 1);
if (error)
return error;
}
/*
* Modify the bitmap to mark this extent allocated.
*/
return xfs_rtmodify_range(args, start, len, 0);
}
/* Reduce @rtxlen until it is a multiple of @prod. */
static inline xfs_rtxlen_t
xfs_rtalloc_align_len(
xfs_rtxlen_t rtxlen,
xfs_rtxlen_t prod)
{
if (unlikely(prod > 1))
return rounddown(rtxlen, prod);
return rtxlen;
}
/*
* Make sure we don't run off the end of the rt volume. Be careful that
* adjusting maxlen downwards doesn't cause us to fail the alignment checks.
*/
static inline xfs_rtxlen_t
xfs_rtallocate_clamp_len(
struct xfs_mount *mp,
xfs_rtxnum_t startrtx,
xfs_rtxlen_t rtxlen,
xfs_rtxlen_t prod)
{
xfs_rtxlen_t ret;
ret = min(mp->m_sb.sb_rextents, startrtx + rtxlen) - startrtx;
return xfs_rtalloc_align_len(ret, prod);
}
/*
* 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 *rtx.
* The lengths are all in rtextents.
*/
STATIC int
xfs_rtallocate_extent_block(
struct xfs_rtalloc_args *args,
xfs_fileoff_t bbno, /* bitmap block number */
xfs_rtxlen_t minlen, /* minimum length to allocate */
xfs_rtxlen_t maxlen, /* maximum length to allocate */
xfs_rtxlen_t *len, /* out: actual length allocated */
xfs_rtxnum_t *nextp, /* out: next rtext to try */
xfs_rtxlen_t prod, /* extent product factor */
xfs_rtxnum_t *rtx) /* out: start rtext allocated */
{
struct xfs_mount *mp = args->mp;
xfs_rtxnum_t besti = -1; /* best rtext found so far */
xfs_rtxnum_t end; /* last rtext in chunk */
xfs_rtxnum_t i; /* current rtext trying */
xfs_rtxnum_t next; /* next rtext to try */
xfs_rtxlen_t scanlen; /* number of free rtx to look for */
xfs_rtxlen_t bestlen = 0; /* best length found so far */
int stat; /* status from internal calls */
int error;
/*
* Loop over all the extents starting in this bitmap block up to the
* end of the rt volume, looking for one that's long enough.
*/
end = min(mp->m_sb.sb_rextents, xfs_rbmblock_to_rtx(mp, bbno + 1)) - 1;
for (i = xfs_rbmblock_to_rtx(mp, bbno); i <= end; i++) {
/* Make sure we don't scan off the end of the rt volume. */
scanlen = xfs_rtallocate_clamp_len(mp, i, maxlen, prod);
if (scanlen < minlen)
break;
/*
* See if there's a free extent of scanlen starting at i.
* If it's not so then next will contain the first non-free.
*/
error = xfs_rtcheck_range(args, i, scanlen, 1, &next, &stat);
if (error)
return error;
if (stat) {
/*
* i to scanlen is all free, allocate and return that.
*/
*len = scanlen;
*rtx = 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_rtxnum_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)
break;
error = xfs_rtfind_forw(args, next, end, &i);
if (error)
return error;
}
/* Searched the whole thing & didn't find a maxlen free extent. */
if (besti == -1)
goto nospace;
/*
* Ensure bestlen is a multiple of prod, but don't return a too-short
* extent.
*/
bestlen = xfs_rtalloc_align_len(bestlen, prod);
if (bestlen < minlen)
goto nospace;
/*
* Pick besti for bestlen & return that.
*/
*len = bestlen;
*rtx = besti;
return 0;
nospace:
/* Allocation failed. Set *nextp to the next block to try. */
*nextp = next;
return -ENOSPC;
}
/*
* 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 *rtx.
* The lengths are all in rtextents.
*/
STATIC int
xfs_rtallocate_extent_exact(
struct xfs_rtalloc_args *args,
xfs_rtxnum_t start, /* starting rtext number to allocate */
xfs_rtxlen_t minlen, /* minimum length to allocate */
xfs_rtxlen_t maxlen, /* maximum length to allocate */
xfs_rtxlen_t *len, /* out: actual length allocated */
xfs_rtxlen_t prod, /* extent product factor */
xfs_rtxnum_t *rtx) /* out: start rtext allocated */
{
struct xfs_mount *mp = args->mp;
xfs_rtxnum_t next; /* next rtext to try (dummy) */
xfs_rtxlen_t alloclen; /* candidate length */
xfs_rtxlen_t scanlen; /* number of free rtx to look for */
int isfree; /* extent is free */
int error;
ASSERT(minlen % prod == 0);
ASSERT(maxlen % prod == 0);
/* Make sure we don't run off the end of the rt volume. */
scanlen = xfs_rtallocate_clamp_len(mp, start, maxlen, prod);
if (scanlen < minlen)
return -ENOSPC;
/* Check if the range in question (for scanlen) is free. */
error = xfs_rtcheck_range(args, start, scanlen, 1, &next, &isfree);
if (error)
return error;
if (isfree) {
/* start to scanlen is all free; allocate it. */
*len = scanlen;
*rtx = start;
return 0;
}
/*
* If not, allocate what there is, if it's at least minlen.
*/
alloclen = next - start;
if (alloclen < minlen)
return -ENOSPC;
/* Ensure alloclen is a multiple of prod. */
alloclen = xfs_rtalloc_align_len(alloclen, prod);
if (alloclen < minlen)
return -ENOSPC;
*len = alloclen;
*rtx = start;
return 0;
}
/*
* Allocate an extent of length minlen<=len<=maxlen, starting as near
* to start 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
xfs_rtallocate_extent_near(
struct xfs_rtalloc_args *args,
xfs_rtxnum_t start, /* starting rtext number to allocate */
xfs_rtxlen_t minlen, /* minimum length to allocate */
xfs_rtxlen_t maxlen, /* maximum length to allocate */
xfs_rtxlen_t *len, /* out: actual length allocated */
xfs_rtxlen_t prod, /* extent product factor */
xfs_rtxnum_t *rtx) /* out: start rtext allocated */
{
struct xfs_mount *mp = args->mp;
int maxlog; /* max useful extent from summary */
xfs_fileoff_t bbno; /* bitmap block number */
int error;
int i; /* bitmap block offset (loop control) */
int j; /* secondary loop control */
int log2len; /* log2 of minlen */
xfs_rtxnum_t n; /* next rtext to try */
ASSERT(minlen % prod == 0);
ASSERT(maxlen % prod == 0);
/*
* If the block number given is off the end, silently set it to
* the last block.
*/
if (start >= mp->m_sb.sb_rextents)
start = mp->m_sb.sb_rextents - 1;
/*
* Try the exact allocation first.
*/
error = xfs_rtallocate_extent_exact(args, start, minlen, maxlen, len,
prod, rtx);
if (error != -ENOSPC)
return error;
bbno = xfs_rtx_to_rbmblock(mp, start);
i = 0;
j = -1;
ASSERT(minlen != 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(args, log2len, mp->m_rsumlevels - 1,
bbno + i, &maxlog);
if (error)
return error;
/*
* If there are any useful extents starting here, try
* allocating one.
*/
if (maxlog >= 0) {
xfs_extlen_t maxavail =
min_t(xfs_rtblock_t, maxlen,
(1ULL << (maxlog + 1)) - 1);
/*
* 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(args,
bbno + i, minlen, maxavail, len,
&n, prod, rtx);
if (error != -ENOSPC)
return error;
}
/*
* On the negative side of the starting location.
*/
else { /* i < 0 */
int maxblocks;
/*
* Loop backwards to find the end of the extent
* we found in the realtime summary.
*
* maxblocks is the maximum possible number of
* bitmap blocks from the start of the extent
* to the end of the extent.
*/
if (maxlog == 0)
maxblocks = 0;
else if (maxlog < mp->m_blkbit_log)
maxblocks = 1;
else
maxblocks = 2 << (maxlog - mp->m_blkbit_log);
/*
* We need to check bbno + i + maxblocks down to
* bbno + i. We already checked bbno down to
* bbno + j + 1, so we don't need to check those
* again.
*/
j = min(i + maxblocks, j);
for (; j >= i; j--) {
error = xfs_rtallocate_extent_block(args,
bbno + j, minlen,
maxavail, len, &n, prod,
rtx);
if (error != -ENOSPC)
return error;
}
}
}
/*
* 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;
}
return -ENOSPC;
}
static int
xfs_rtalloc_sumlevel(
struct xfs_rtalloc_args *args,
int l, /* level number */
xfs_rtxlen_t minlen, /* minimum length to allocate */
xfs_rtxlen_t maxlen, /* maximum length to allocate */
xfs_rtxlen_t prod, /* extent product factor */
xfs_rtxlen_t *len, /* out: actual length allocated */
xfs_rtxnum_t *rtx) /* out: start rtext allocated */
{
xfs_fileoff_t i; /* bitmap block number */
int error;
for (i = 0; i < args->mp->m_sb.sb_rbmblocks; i++) {
xfs_suminfo_t sum; /* summary information for extents */
xfs_rtxnum_t n; /* next rtext to be tried */
error = xfs_rtget_summary(args, l, i, &sum);
if (error)
return error;
/*
* Nothing there, on to the next block.
*/
if (!sum)
continue;
/*
* Try allocating the extent.
*/
error = xfs_rtallocate_extent_block(args, i, minlen, maxlen,
len, &n, prod, rtx);
if (error != -ENOSPC)
return error;
/*
* If the "next block to try" returned from the allocator is
* beyond the next bitmap block, skip to that bitmap block.
*/
if (xfs_rtx_to_rbmblock(args->mp, n) > i + 1)
i = xfs_rtx_to_rbmblock(args->mp, n) - 1;
}
return -ENOSPC;
}
/*
* 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
xfs_rtallocate_extent_size(
struct xfs_rtalloc_args *args,
xfs_rtxlen_t minlen, /* minimum length to allocate */
xfs_rtxlen_t maxlen, /* maximum length to allocate */
xfs_rtxlen_t *len, /* out: actual length allocated */
xfs_rtxlen_t prod, /* extent product factor */
xfs_rtxnum_t *rtx) /* out: start rtext allocated */
{
int error;
int l; /* level number (loop control) */
ASSERT(minlen % prod == 0);
ASSERT(maxlen % prod == 0);
ASSERT(maxlen != 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 < args->mp->m_rsumlevels; l++) {
error = xfs_rtalloc_sumlevel(args, l, minlen, maxlen, prod, len,
rtx);
if (error != -ENOSPC)
return error;
}
/*
* Didn't find any maxlen blocks. Try smaller ones, unless we are
* looking for a fixed size extent.
*/
if (minlen > --maxlen)
return -ENOSPC;
ASSERT(minlen != 0);
ASSERT(maxlen != 0);
/*
* Loop over sizes, from maxlen down to minlen.
*
* This time, when we do the allocations, allow smaller ones to succeed,
* but make sure the specified minlen/maxlen are in the possible range
* for this summary level.
*/
for (l = xfs_highbit32(maxlen); l >= xfs_highbit32(minlen); l--) {
error = xfs_rtalloc_sumlevel(args, l,
max_t(xfs_rtxlen_t, minlen, 1 << l),
min_t(xfs_rtxlen_t, maxlen, (1 << (l + 1)) - 1),
prod, len, rtx);
if (error != -ENOSPC)
return error;
}
return -ENOSPC;
}
static int
xfs_alloc_rsum_cache(
struct xfs_mount *mp,
xfs_extlen_t rbmblocks)
{
/*
* The rsum cache is initialized to the maximum value, which is
* trivially an upper bound on the maximum level with any free extents.
*/
mp->m_rsum_cache = kvmalloc(rbmblocks, GFP_KERNEL);
if (!mp->m_rsum_cache)
return -ENOMEM;
memset(mp->m_rsum_cache, -1, rbmblocks);
return 0;
}
/*
* If we changed the rt extent size (meaning there was no rt volume previously)
* and the root directory had EXTSZINHERIT and RTINHERIT set, it's possible
* that the extent size hint on the root directory is no longer congruent with
* the new rt extent size. Log the rootdir inode to fix this.
*/
static int
xfs_growfs_rt_fixup_extsize(
struct xfs_mount *mp)
{
struct xfs_inode *ip = mp->m_rootip;
struct xfs_trans *tp;
int error = 0;
xfs_ilock(ip, XFS_IOLOCK_EXCL);
if (!(ip->i_diflags & XFS_DIFLAG_RTINHERIT) ||
!(ip->i_diflags & XFS_DIFLAG_EXTSZINHERIT))
goto out_iolock;
error = xfs_trans_alloc_inode(ip, &M_RES(mp)->tr_ichange, 0, 0, false,
&tp);
if (error)
goto out_iolock;
xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
error = xfs_trans_commit(tp);
xfs_iunlock(ip, XFS_ILOCK_EXCL);
out_iolock:
xfs_iunlock(ip, XFS_IOLOCK_EXCL);
return error;
}
static int
xfs_growfs_rt_bmblock(
struct xfs_mount *mp,
xfs_rfsblock_t nrblocks,
xfs_agblock_t rextsize,
xfs_fileoff_t bmbno)
{
struct xfs_inode *rbmip = mp->m_rbmip;
struct xfs_inode *rsumip = mp->m_rsumip;
struct xfs_rtalloc_args args = {
.mp = mp,
};
struct xfs_rtalloc_args nargs = {
};
struct xfs_mount *nmp;
xfs_rfsblock_t nrblocks_step;
xfs_rtbxlen_t freed_rtx;
int error;
nrblocks_step = (bmbno + 1) * NBBY * mp->m_sb.sb_blocksize * rextsize;
nmp = nargs.mp = kmemdup(mp, sizeof(*mp), GFP_KERNEL);
if (!nmp)
return -ENOMEM;
/*
* Calculate new sb and mount fields for this round.
*/
nmp->m_sb.sb_rextsize = rextsize;
xfs_mount_sb_set_rextsize(nmp, &nmp->m_sb);
nmp->m_sb.sb_rbmblocks = bmbno + 1;
nmp->m_sb.sb_rblocks = min(nrblocks, nrblocks_step);
nmp->m_sb.sb_rextents = xfs_rtb_to_rtx(nmp, nmp->m_sb.sb_rblocks);
nmp->m_sb.sb_rextslog = xfs_compute_rextslog(nmp->m_sb.sb_rextents);
nmp->m_rsumlevels = nmp->m_sb.sb_rextslog + 1;
nmp->m_rsumblocks = xfs_rtsummary_blockcount(mp, nmp->m_rsumlevels,
nmp->m_sb.sb_rbmblocks);
/*
* Recompute the growfsrt reservation from the new rsumsize, so that the
* transaction below use the new, potentially larger value.
* */
xfs_trans_resv_calc(nmp, &nmp->m_resv);
error = xfs_trans_alloc(mp, &M_RES(nmp)->tr_growrtfree, 0, 0, 0,
&args.tp);
if (error)
goto out_free;
nargs.tp = args.tp;
xfs_rtbitmap_lock(mp);
xfs_rtbitmap_trans_join(args.tp);
/*
* Update the bitmap inode's size ondisk and incore. We need to update
* the incore size so that inode inactivation won't punch what it thinks
* are "posteof" blocks.
*/
rbmip->i_disk_size = nmp->m_sb.sb_rbmblocks * nmp->m_sb.sb_blocksize;
i_size_write(VFS_I(rbmip), rbmip->i_disk_size);
xfs_trans_log_inode(args.tp, rbmip, XFS_ILOG_CORE);
/*
* Update the summary inode's size. We need to update the incore size
* so that inode inactivation won't punch what it thinks are "posteof"
* blocks.
*/
rsumip->i_disk_size = nmp->m_rsumblocks * nmp->m_sb.sb_blocksize;
i_size_write(VFS_I(rsumip), rsumip->i_disk_size);
xfs_trans_log_inode(args.tp, rsumip, XFS_ILOG_CORE);
/*
* Copy summary data from old to new sizes when the real size (not
* block-aligned) changes.
*/
if (mp->m_sb.sb_rbmblocks != nmp->m_sb.sb_rbmblocks ||
mp->m_rsumlevels != nmp->m_rsumlevels) {
error = xfs_rtcopy_summary(&args, &nargs);
if (error)
goto out_cancel;
}
/*
* Update superblock fields.
*/
if (nmp->m_sb.sb_rextsize != mp->m_sb.sb_rextsize)
xfs_trans_mod_sb(args.tp, XFS_TRANS_SB_REXTSIZE,
nmp->m_sb.sb_rextsize - mp->m_sb.sb_rextsize);
if (nmp->m_sb.sb_rbmblocks != mp->m_sb.sb_rbmblocks)
xfs_trans_mod_sb(args.tp, XFS_TRANS_SB_RBMBLOCKS,
nmp->m_sb.sb_rbmblocks - mp->m_sb.sb_rbmblocks);
if (nmp->m_sb.sb_rblocks != mp->m_sb.sb_rblocks)
xfs_trans_mod_sb(args.tp, XFS_TRANS_SB_RBLOCKS,
nmp->m_sb.sb_rblocks - mp->m_sb.sb_rblocks);
if (nmp->m_sb.sb_rextents != mp->m_sb.sb_rextents)
xfs_trans_mod_sb(args.tp, XFS_TRANS_SB_REXTENTS,
nmp->m_sb.sb_rextents - mp->m_sb.sb_rextents);
if (nmp->m_sb.sb_rextslog != mp->m_sb.sb_rextslog)
xfs_trans_mod_sb(args.tp, XFS_TRANS_SB_REXTSLOG,
nmp->m_sb.sb_rextslog - mp->m_sb.sb_rextslog);
/*
* Free the new extent.
*/
freed_rtx = nmp->m_sb.sb_rextents - mp->m_sb.sb_rextents;
error = xfs_rtfree_range(&nargs, mp->m_sb.sb_rextents, freed_rtx);
xfs_rtbuf_cache_relse(&nargs);
if (error)
goto out_cancel;
/*
* Mark more blocks free in the superblock.
*/
xfs_trans_mod_sb(args.tp, XFS_TRANS_SB_FREXTENTS, freed_rtx);
/*
* Update the calculated values in the real mount structure.
*/
mp->m_rsumlevels = nmp->m_rsumlevels;
mp->m_rsumblocks = nmp->m_rsumblocks;
xfs_mount_sb_set_rextsize(mp, &mp->m_sb);
/*
* Recompute the growfsrt reservation from the new rsumsize.
*/
xfs_trans_resv_calc(mp, &mp->m_resv);
error = xfs_trans_commit(args.tp);
if (error)
goto out_free;
/*
* Ensure the mount RT feature flag is now set.
*/
mp->m_features |= XFS_FEAT_REALTIME;
kfree(nmp);
return 0;
out_cancel:
xfs_trans_cancel(args.tp);
out_free:
kfree(nmp);
return error;
}
/*
* Calculate the last rbmblock currently used.
*
* This also deals with the case where there were no rtextents before.
*/
static xfs_fileoff_t
xfs_last_rt_bmblock(
struct xfs_mount *mp)
{
xfs_fileoff_t bmbno = mp->m_sb.sb_rbmblocks;
/* Skip the current block if it is exactly full. */
if (xfs_rtx_to_rbmword(mp, mp->m_sb.sb_rextents) != 0)
bmbno--;
return bmbno;
}
/*
* 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_fileoff_t bmbno; /* bitmap block number */
struct xfs_buf *bp; /* temporary buffer */
int error; /* error return value */
xfs_extlen_t nrbmblocks; /* new number of rt bitmap blocks */
xfs_rtxnum_t nrextents; /* new number of realtime extents */
xfs_extlen_t nrsumblocks; /* new number of summary blocks */
xfs_extlen_t rbmblocks; /* current number of rt bitmap blocks */
xfs_extlen_t rsumblocks; /* current number of rt summary blks */
uint8_t *rsum_cache; /* old summary cache */
xfs_agblock_t old_rextsize = mp->m_sb.sb_rextsize;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
/* Needs to have been mounted with an rt device. */
if (!XFS_IS_REALTIME_MOUNT(mp))
return -EINVAL;
if (!mutex_trylock(&mp->m_growlock))
return -EWOULDBLOCK;
/*
* Mount should fail if the rt bitmap/summary files don't load, but
* we'll check anyway.
*/
error = -EINVAL;
if (!mp->m_rbmip || !mp->m_rsumip)
goto out_unlock;
/* Shrink not supported. */
if (in->newblocks <= mp->m_sb.sb_rblocks)
goto out_unlock;
/* Can only change rt extent size when adding rt volume. */
if (mp->m_sb.sb_rblocks > 0 && in->extsize != mp->m_sb.sb_rextsize)
goto out_unlock;
/* Range check the extent size. */
if (XFS_FSB_TO_B(mp, in->extsize) > XFS_MAX_RTEXTSIZE ||
XFS_FSB_TO_B(mp, in->extsize) < XFS_MIN_RTEXTSIZE)
goto out_unlock;
/* Unsupported realtime features. */
error = -EOPNOTSUPP;
if (xfs_has_rmapbt(mp) || xfs_has_reflink(mp) || xfs_has_quota(mp))
goto out_unlock;
error = xfs_sb_validate_fsb_count(&mp->m_sb, in->newblocks);
if (error)
goto out_unlock;
/*
* Read in the last block of the device, make sure it exists.
*/
error = xfs_buf_read_uncached(mp->m_rtdev_targp,
XFS_FSB_TO_BB(mp, in->newblocks - 1),
XFS_FSB_TO_BB(mp, 1), 0, &bp, NULL);
if (error)
goto out_unlock;
xfs_buf_relse(bp);
/*
* Calculate new parameters. These are the final values to be reached.
*/
nrextents = div_u64(in->newblocks, in->extsize);
if (nrextents == 0) {
error = -EINVAL;
goto out_unlock;
}
nrbmblocks = xfs_rtbitmap_blockcount(mp, nrextents);
nrsumblocks = xfs_rtsummary_blockcount(mp,
xfs_compute_rextslog(nrextents) + 1, nrbmblocks);
/*
* 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)) {
error = -EINVAL;
goto out_unlock;
}
/*
* 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_disk_size);
rsumblocks = XFS_B_TO_FSB(mp, mp->m_rsumip->i_disk_size);
/*
* Allocate space to the bitmap and summary files, as necessary.
*/
error = xfs_rtfile_initialize_blocks(mp->m_rbmip, rbmblocks,
nrbmblocks, NULL);
if (error)
goto out_unlock;
error = xfs_rtfile_initialize_blocks(mp->m_rsumip, rsumblocks,
nrsumblocks, NULL);
if (error)
goto out_unlock;
rsum_cache = mp->m_rsum_cache;
if (nrbmblocks != mp->m_sb.sb_rbmblocks) {
error = xfs_alloc_rsum_cache(mp, nrbmblocks);
if (error)
goto out_unlock;
}
/* Initialize the free space bitmap one bitmap block at a time. */
for (bmbno = xfs_last_rt_bmblock(mp); bmbno < nrbmblocks; bmbno++) {
error = xfs_growfs_rt_bmblock(mp, in->newblocks, in->extsize,
bmbno);
if (error)
goto out_free;
}
if (old_rextsize != in->extsize) {
error = xfs_growfs_rt_fixup_extsize(mp);
if (error)
goto out_free;
}
/* Update secondary superblocks now the physical grow has completed */
error = xfs_update_secondary_sbs(mp);
out_free:
/*
* If we had to allocate a new rsum_cache, we either need to free the
* old one (if we succeeded) or free the new one and restore the old one
* (if there was an error).
*/
if (rsum_cache != mp->m_rsum_cache) {
if (error) {
kvfree(mp->m_rsum_cache);
mp->m_rsum_cache = rsum_cache;
} else {
kvfree(rsum_cache);
}
}
out_unlock:
mutex_unlock(&mp->m_growlock);
return error;
}
/*
* Initialize realtime fields in the mount structure.
*/
int /* error */
xfs_rtmount_init(
struct xfs_mount *mp) /* file system mount structure */
{
struct xfs_buf *bp; /* buffer for last block of subvolume */
struct xfs_sb *sbp; /* filesystem superblock copy in mount */
xfs_daddr_t d; /* address of last block of subvolume */
int error;
sbp = &mp->m_sb;
if (sbp->sb_rblocks == 0)
return 0;
if (mp->m_rtdev_targp == NULL) {
xfs_warn(mp,
"Filesystem has a realtime volume, use rtdev=device option");
return -ENODEV;
}
mp->m_rsumlevels = sbp->sb_rextslog + 1;
mp->m_rsumblocks = xfs_rtsummary_blockcount(mp, mp->m_rsumlevels,
mp->m_sb.sb_rbmblocks);
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) {
xfs_warn(mp, "realtime mount -- %llu != %llu",
(unsigned long long) XFS_BB_TO_FSB(mp, d),
(unsigned long long) mp->m_sb.sb_rblocks);
return -EFBIG;
}
error = xfs_buf_read_uncached(mp->m_rtdev_targp,
d - XFS_FSB_TO_BB(mp, 1),
XFS_FSB_TO_BB(mp, 1), 0, &bp, NULL);
if (error) {
xfs_warn(mp, "realtime device size check failed");
return error;
}
xfs_buf_relse(bp);
return 0;
}
static int
xfs_rtalloc_count_frextent(
struct xfs_mount *mp,
struct xfs_trans *tp,
const struct xfs_rtalloc_rec *rec,
void *priv)
{
uint64_t *valp = priv;
*valp += rec->ar_extcount;
return 0;
}
/*
* Reinitialize the number of free realtime extents from the realtime bitmap.
* Callers must ensure that there is no other activity in the filesystem.
*/
int
xfs_rtalloc_reinit_frextents(
struct xfs_mount *mp)
{
uint64_t val = 0;
int error;
xfs_rtbitmap_lock_shared(mp, XFS_RBMLOCK_BITMAP);
error = xfs_rtalloc_query_all(mp, NULL, xfs_rtalloc_count_frextent,
&val);
xfs_rtbitmap_unlock_shared(mp, XFS_RBMLOCK_BITMAP);
if (error)
return error;
spin_lock(&mp->m_sb_lock);
mp->m_sb.sb_frextents = val;
spin_unlock(&mp->m_sb_lock);
percpu_counter_set(&mp->m_frextents, mp->m_sb.sb_frextents);
return 0;
}
/*
* Read in the bmbt of an rt metadata inode so that we never have to load them
* at runtime. This enables the use of shared ILOCKs for rtbitmap scans. Use
* an empty transaction to avoid deadlocking on loops in the bmbt.
*/
static inline int
xfs_rtmount_iread_extents(
struct xfs_inode *ip,
unsigned int lock_class)
{
struct xfs_trans *tp;
int error;
error = xfs_trans_alloc_empty(ip->i_mount, &tp);
if (error)
return error;
xfs_ilock(ip, XFS_ILOCK_EXCL | lock_class);
error = xfs_iread_extents(tp, ip, XFS_DATA_FORK);
if (error)
goto out_unlock;
if (xfs_inode_has_attr_fork(ip)) {
error = xfs_iread_extents(tp, ip, XFS_ATTR_FORK);
if (error)
goto out_unlock;
}
out_unlock:
xfs_iunlock(ip, XFS_ILOCK_EXCL | lock_class);
xfs_trans_cancel(tp);
return error;
}
/*
* Get the bitmap and summary inodes and the summary cache 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;
error = xfs_iget(mp, NULL, sbp->sb_rbmino, 0, 0, &mp->m_rbmip);
if (xfs_metadata_is_sick(error))
xfs_rt_mark_sick(mp, XFS_SICK_RT_BITMAP);
if (error)
return error;
ASSERT(mp->m_rbmip != NULL);
error = xfs_rtmount_iread_extents(mp->m_rbmip, XFS_ILOCK_RTBITMAP);
if (error)
goto out_rele_bitmap;
error = xfs_iget(mp, NULL, sbp->sb_rsumino, 0, 0, &mp->m_rsumip);
if (xfs_metadata_is_sick(error))
xfs_rt_mark_sick(mp, XFS_SICK_RT_SUMMARY);
if (error)
goto out_rele_bitmap;
ASSERT(mp->m_rsumip != NULL);
error = xfs_rtmount_iread_extents(mp->m_rsumip, XFS_ILOCK_RTSUM);
if (error)
goto out_rele_summary;
error = xfs_alloc_rsum_cache(mp, sbp->sb_rbmblocks);
if (error)
goto out_rele_summary;
return 0;
out_rele_summary:
xfs_irele(mp->m_rsumip);
out_rele_bitmap:
xfs_irele(mp->m_rbmip);
return error;
}
void
xfs_rtunmount_inodes(
struct xfs_mount *mp)
{
kvfree(mp->m_rsum_cache);
if (mp->m_rbmip)
xfs_irele(mp->m_rbmip);
if (mp->m_rsumip)
xfs_irele(mp->m_rsumip);
}
/*
* 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, ...
*/
static xfs_rtxnum_t
xfs_rtpick_extent(
xfs_mount_t *mp, /* file system mount point */
xfs_trans_t *tp, /* transaction pointer */
xfs_rtxlen_t len) /* allocation length (rtextents) */
{
xfs_rtxnum_t b; /* result rtext */
int log2; /* log of sequence number */
uint64_t resid; /* residual after log removed */
uint64_t seq; /* sequence number of file creation */
struct timespec64 ts; /* timespec in inode */
xfs_assert_ilocked(mp->m_rbmip, XFS_ILOCK_EXCL);
ts = inode_get_atime(VFS_I(mp->m_rbmip));
if (!(mp->m_rbmip->i_diflags & XFS_DIFLAG_NEWRTBM)) {
mp->m_rbmip->i_diflags |= XFS_DIFLAG_NEWRTBM;
seq = 0;
} else {
seq = ts.tv_sec;
}
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)
div64_u64_rem(b, mp->m_sb.sb_rextents, &b);
if (b + len > mp->m_sb.sb_rextents)
b = mp->m_sb.sb_rextents - len;
}
ts.tv_sec = seq + 1;
inode_set_atime_to_ts(VFS_I(mp->m_rbmip), ts);
xfs_trans_log_inode(tp, mp->m_rbmip, XFS_ILOG_CORE);
return b;
}
static void
xfs_rtalloc_align_minmax(
xfs_rtxlen_t *raminlen,
xfs_rtxlen_t *ramaxlen,
xfs_rtxlen_t *prod)
{
xfs_rtxlen_t newmaxlen = *ramaxlen;
xfs_rtxlen_t newminlen = *raminlen;
xfs_rtxlen_t slack;
slack = newmaxlen % *prod;
if (slack)
newmaxlen -= slack;
slack = newminlen % *prod;
if (slack)
newminlen += *prod - slack;
/*
* If adjusting for extent size hint alignment produces an invalid
* min/max len combination, go ahead without it.
*/
if (newmaxlen < newminlen) {
*prod = 1;
return;
}
*ramaxlen = newmaxlen;
*raminlen = newminlen;
}
static int
xfs_rtallocate(
struct xfs_trans *tp,
xfs_rtblock_t bno_hint,
xfs_rtxlen_t minlen,
xfs_rtxlen_t maxlen,
xfs_rtxlen_t prod,
bool wasdel,
bool initial_user_data,
bool *rtlocked,
xfs_rtblock_t *bno,
xfs_extlen_t *blen)
{
struct xfs_rtalloc_args args = {
.mp = tp->t_mountp,
.tp = tp,
};
xfs_rtxnum_t start = 0;
xfs_rtxnum_t rtx;
xfs_rtxlen_t len = 0;
int error = 0;
/*
* Lock out modifications to both the RT bitmap and summary inodes.
*/
if (!*rtlocked) {
xfs_rtbitmap_lock(args.mp);
xfs_rtbitmap_trans_join(tp);
*rtlocked = true;
}
/*
* For an allocation to an empty file at offset 0, pick an extent that
* will space things out in the rt area.
*/
if (bno_hint)
start = xfs_rtb_to_rtx(args.mp, bno_hint);
else if (initial_user_data)
start = xfs_rtpick_extent(args.mp, tp, maxlen);
if (start) {
error = xfs_rtallocate_extent_near(&args, start, minlen, maxlen,
&len, prod, &rtx);
/*
* If we can't allocate near a specific rt extent, try again
* without locality criteria.
*/
if (error == -ENOSPC) {
xfs_rtbuf_cache_relse(&args);
error = 0;
}
}
if (!error) {
error = xfs_rtallocate_extent_size(&args, minlen, maxlen, &len,
prod, &rtx);
}
if (error)
goto out_release;
error = xfs_rtallocate_range(&args, rtx, len);
if (error)
goto out_release;
xfs_trans_mod_sb(tp, wasdel ?
XFS_TRANS_SB_RES_FREXTENTS : XFS_TRANS_SB_FREXTENTS,
-(long)len);
*bno = xfs_rtx_to_rtb(args.mp, rtx);
*blen = xfs_rtxlen_to_extlen(args.mp, len);
out_release:
xfs_rtbuf_cache_relse(&args);
return error;
}
static int
xfs_rtallocate_align(
struct xfs_bmalloca *ap,
xfs_rtxlen_t *ralen,
xfs_rtxlen_t *raminlen,
xfs_rtxlen_t *prod,
bool *noalign)
{
struct xfs_mount *mp = ap->ip->i_mount;
xfs_fileoff_t orig_offset = ap->offset;
xfs_extlen_t minlen = mp->m_sb.sb_rextsize;
xfs_extlen_t align; /* minimum allocation alignment */
xfs_extlen_t mod; /* product factor for allocators */
int error;
if (*noalign) {
align = mp->m_sb.sb_rextsize;
} else {
align = xfs_get_extsz_hint(ap->ip);
if (!align)
align = 1;
if (align == mp->m_sb.sb_rextsize)
*noalign = true;
}
error = xfs_bmap_extsize_align(mp, &ap->got, &ap->prev, align, 1,
ap->eof, 0, ap->conv, &ap->offset, &ap->length);
if (error)
return error;
ASSERT(ap->length);
ASSERT(xfs_extlen_to_rtxmod(mp, ap->length) == 0);
/*
* If we shifted the file offset downward to satisfy an extent size
* hint, increase minlen by that amount so that the allocator won't
* give us an allocation that's too short to cover at least one of the
* blocks that the caller asked for.
*/
if (ap->offset != orig_offset)
minlen += orig_offset - ap->offset;
/*
* Set ralen to be the actual requested length in rtextents.
*
* If the old value was close enough to XFS_BMBT_MAX_EXTLEN that
* we rounded up to it, cut it back so it's valid again.
* Note that if it's a really large request (bigger than
* XFS_BMBT_MAX_EXTLEN), we don't hear about that number, and can't
* adjust the starting point to match it.
*/
*ralen = xfs_extlen_to_rtxlen(mp, min(ap->length, XFS_MAX_BMBT_EXTLEN));
*raminlen = max_t(xfs_rtxlen_t, 1, xfs_extlen_to_rtxlen(mp, minlen));
ASSERT(*raminlen > 0);
ASSERT(*raminlen <= *ralen);
/*
* Only bother calculating a real prod factor if offset & length are
* perfectly aligned, otherwise it will just get us in trouble.
*/
div_u64_rem(ap->offset, align, &mod);
if (mod || ap->length % align)
*prod = 1;
else
*prod = xfs_extlen_to_rtxlen(mp, align);
if (*prod > 1)
xfs_rtalloc_align_minmax(raminlen, ralen, prod);
return 0;
}
int
xfs_bmap_rtalloc(
struct xfs_bmalloca *ap)
{
xfs_fileoff_t orig_offset = ap->offset;
xfs_rtxlen_t prod = 0; /* product factor for allocators */
xfs_rtxlen_t ralen = 0; /* realtime allocation length */
xfs_rtblock_t bno_hint = NULLRTBLOCK;
xfs_extlen_t orig_length = ap->length;
xfs_rtxlen_t raminlen;
bool rtlocked = false;
bool noalign = false;
bool initial_user_data =
ap->datatype & XFS_ALLOC_INITIAL_USER_DATA;
int error;
retry:
error = xfs_rtallocate_align(ap, &ralen, &raminlen, &prod, &noalign);
if (error)
return error;
if (xfs_bmap_adjacent(ap))
bno_hint = ap->blkno;
error = xfs_rtallocate(ap->tp, bno_hint, raminlen, ralen, prod,
ap->wasdel, initial_user_data, &rtlocked,
&ap->blkno, &ap->length);
if (error == -ENOSPC) {
if (!noalign) {
/*
* We previously enlarged the request length to try to
* satisfy an extent size hint. The allocator didn't
* return anything, so reset the parameters to the
* original values and try again without alignment
* criteria.
*/
ap->offset = orig_offset;
ap->length = orig_length;
noalign = true;
goto retry;
}
ap->blkno = NULLFSBLOCK;
ap->length = 0;
return 0;
}
if (error)
return error;
xfs_bmap_alloc_account(ap);
return 0;
}
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