Google Git
Sign in
android-kvm / linux / refs/heads/for-upstream/guestmem / . / fs / xfs / xfs_rtalloc.c
blob: 0cb534d71119a5652b08435b5a0567fcc85f56e4 [file] [log] [blame] [edit]
// 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"
#include "xfs_da_format.h"
#include "xfs_metafile.h"
#include "xfs_rtgroup.h"
#include "xfs_error.h"
#include "xfs_trace.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 */
{
uint8_t *rsum_cache = args->rtg->rtg_rsum_cache;
int error;
int log; /* loop counter, log2 of ext. size */
xfs_suminfo_t sum; /* summary data */
/* There are no extents at levels >= rsum_cache[bbno]. */
if (rsum_cache) {
high = min(high, 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 (rsum_cache && log + 1 < rsum_cache[bbno])
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, args->rtg->rtg_extents - 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_rtgroup *rtg,
xfs_rtxnum_t startrtx,
xfs_rtxlen_t rtxlen,
xfs_rtxlen_t prod)
{
xfs_rtxlen_t ret;
ret = min(rtg->rtg_extents, 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(args->rtg->rtg_extents, 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(args->rtg, 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 */
{
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(args->rtg, 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.
*/
start = min(start, args->rtg->rtg_extents - 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 void
xfs_rtunmount_rtg(
struct xfs_rtgroup *rtg)
{
int i;
for (i = 0; i < XFS_RTGI_MAX; i++)
xfs_rtginode_irele(&rtg->rtg_inodes[i]);
kvfree(rtg->rtg_rsum_cache);
}
static int
xfs_alloc_rsum_cache(
struct xfs_rtgroup *rtg,
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.
*/
rtg->rtg_rsum_cache = kvmalloc(rbmblocks, GFP_KERNEL);
if (!rtg->rtg_rsum_cache)
return -ENOMEM;
memset(rtg->rtg_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;
}
/* Ensure that the rtgroup metadata inode is loaded, creating it if neeeded. */
static int
xfs_rtginode_ensure(
struct xfs_rtgroup *rtg,
enum xfs_rtg_inodes type)
{
struct xfs_trans *tp;
int error;
if (rtg->rtg_inodes[type])
return 0;
error = xfs_trans_alloc_empty(rtg_mount(rtg), &tp);
if (error)
return error;
error = xfs_rtginode_load(rtg, type, tp);
xfs_trans_cancel(tp);
if (error != -ENOENT)
return 0;
return xfs_rtginode_create(rtg, type, true);
}
static struct xfs_mount *
xfs_growfs_rt_alloc_fake_mount(
const struct xfs_mount *mp,
xfs_rfsblock_t rblocks,
xfs_agblock_t rextsize)
{
struct xfs_mount *nmp;
nmp = kmemdup(mp, sizeof(*mp), GFP_KERNEL);
if (!nmp)
return NULL;
xfs_mount_sb_set_rextsize(nmp, &nmp->m_sb, rextsize);
nmp->m_sb.sb_rblocks = rblocks;
nmp->m_sb.sb_rextents = xfs_blen_to_rtbxlen(nmp, nmp->m_sb.sb_rblocks);
nmp->m_sb.sb_rbmblocks = xfs_rtbitmap_blockcount(nmp);
nmp->m_sb.sb_rextslog = xfs_compute_rextslog(nmp->m_sb.sb_rextents);
if (xfs_has_rtgroups(nmp))
nmp->m_sb.sb_rgcount = howmany_64(nmp->m_sb.sb_rextents,
nmp->m_sb.sb_rgextents);
else
nmp->m_sb.sb_rgcount = 1;
nmp->m_rsumblocks = xfs_rtsummary_blockcount(nmp, &nmp->m_rsumlevels);
if (rblocks > 0)
nmp->m_features |= XFS_FEAT_REALTIME;
/* recompute growfsrt reservation from new rsumsize */
xfs_trans_resv_calc(nmp, &nmp->m_resv);
return nmp;
}
/* Free all the new space and return the number of extents actually freed. */
static int
xfs_growfs_rt_free_new(
struct xfs_rtgroup *rtg,
struct xfs_rtalloc_args *nargs,
xfs_rtbxlen_t *freed_rtx)
{
struct xfs_mount *mp = rtg_mount(rtg);
xfs_rgnumber_t rgno = rtg_rgno(rtg);
xfs_rtxnum_t start_rtx = 0, end_rtx;
if (rgno < mp->m_sb.sb_rgcount)
start_rtx = xfs_rtgroup_extents(mp, rgno);
end_rtx = xfs_rtgroup_extents(nargs->mp, rgno);
/*
* Compute the first new extent that we want to free, being careful to
* skip past a realtime superblock at the start of the realtime volume.
*/
if (xfs_has_rtsb(nargs->mp) && rgno == 0 && start_rtx == 0)
start_rtx++;
*freed_rtx = end_rtx - start_rtx;
return xfs_rtfree_range(nargs, start_rtx, *freed_rtx);
}
static xfs_rfsblock_t
xfs_growfs_rt_nrblocks(
struct xfs_rtgroup *rtg,
xfs_rfsblock_t nrblocks,
xfs_agblock_t rextsize,
xfs_fileoff_t bmbno)
{
struct xfs_mount *mp = rtg_mount(rtg);
xfs_rfsblock_t step;
step = (bmbno + 1) * mp->m_rtx_per_rbmblock * rextsize;
if (xfs_has_rtgroups(mp)) {
xfs_rfsblock_t rgblocks = mp->m_sb.sb_rgextents * rextsize;
step = min(rgblocks, step) + rgblocks * rtg_rgno(rtg);
}
return min(nrblocks, step);
}
/*
* If the post-grow filesystem will have an rtsb; we're initializing the first
* rtgroup; and the filesystem didn't have a realtime section, write the rtsb
* now, and attach the rtsb buffer to the real mount.
*/
static int
xfs_growfs_rt_init_rtsb(
const struct xfs_rtalloc_args *nargs,
const struct xfs_rtgroup *rtg,
const struct xfs_rtalloc_args *args)
{
struct xfs_mount *mp = args->mp;
struct xfs_buf *rtsb_bp;
int error;
if (!xfs_has_rtsb(nargs->mp))
return 0;
if (rtg_rgno(rtg) > 0)
return 0;
if (mp->m_sb.sb_rblocks)
return 0;
error = xfs_buf_get_uncached(mp->m_rtdev_targp, XFS_FSB_TO_BB(mp, 1),
0, &rtsb_bp);
if (error)
return error;
rtsb_bp->b_maps[0].bm_bn = XFS_RTSB_DADDR;
rtsb_bp->b_ops = &xfs_rtsb_buf_ops;
xfs_update_rtsb(rtsb_bp, mp->m_sb_bp);
mp->m_rtsb_bp = rtsb_bp;
error = xfs_bwrite(rtsb_bp);
xfs_buf_unlock(rtsb_bp);
return error;
}
static int
xfs_growfs_rt_bmblock(
struct xfs_rtgroup *rtg,
xfs_rfsblock_t nrblocks,
xfs_agblock_t rextsize,
xfs_fileoff_t bmbno)
{
struct xfs_mount *mp = rtg_mount(rtg);
struct xfs_inode *rbmip = rtg->rtg_inodes[XFS_RTGI_BITMAP];
struct xfs_inode *rsumip = rtg->rtg_inodes[XFS_RTGI_SUMMARY];
struct xfs_rtalloc_args args = {
.mp = mp,
.rtg = rtg,
};
struct xfs_rtalloc_args nargs = {
.rtg = rtg,
};
struct xfs_mount *nmp;
xfs_rtbxlen_t freed_rtx;
int error;
/*
* Calculate new sb and mount fields for this round. Also ensure the
* rtg_extents value is uptodate as the rtbitmap code relies on it.
*/
nmp = nargs.mp = xfs_growfs_rt_alloc_fake_mount(mp,
xfs_growfs_rt_nrblocks(rtg, nrblocks, rextsize, bmbno),
rextsize);
if (!nmp)
return -ENOMEM;
xfs_rtgroup_calc_geometry(nmp, rtg, rtg_rgno(rtg),
nmp->m_sb.sb_rgcount, nmp->m_sb.sb_rextents);
/*
* 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_rtgroup_lock(args.rtg, XFS_RTGLOCK_BITMAP);
xfs_rtgroup_trans_join(args.tp, args.rtg, XFS_RTGLOCK_BITMAP);
/*
* 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;
}
error = xfs_growfs_rt_init_rtsb(&nargs, rtg, &args);
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);
if (nmp->m_sb.sb_rgcount != mp->m_sb.sb_rgcount)
xfs_trans_mod_sb(args.tp, XFS_TRANS_SB_RGCOUNT,
nmp->m_sb.sb_rgcount - mp->m_sb.sb_rgcount);
/*
* Free the new extent.
*/
error = xfs_growfs_rt_free_new(rtg, &nargs, &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;
/*
* 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;
}
static xfs_rtxnum_t
xfs_last_rtgroup_extents(
struct xfs_mount *mp)
{
return mp->m_sb.sb_rextents -
((xfs_rtxnum_t)(mp->m_sb.sb_rgcount - 1) *
mp->m_sb.sb_rgextents);
}
/*
* 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_rtgroup *rtg)
{
struct xfs_mount *mp = rtg_mount(rtg);
xfs_rgnumber_t rgno = rtg_rgno(rtg);
xfs_fileoff_t bmbno = 0;
ASSERT(!mp->m_sb.sb_rgcount || rgno >= mp->m_sb.sb_rgcount - 1);
if (mp->m_sb.sb_rgcount && rgno == mp->m_sb.sb_rgcount - 1) {
xfs_rtxnum_t nrext = xfs_last_rtgroup_extents(mp);
/* Also fill up the previous block if not entirely full. */
bmbno = xfs_rtbitmap_blockcount_len(mp, nrext);
if (xfs_rtx_to_rbmword(mp, nrext) != 0)
bmbno--;
}
return bmbno;
}
/*
* Allocate space to the bitmap and summary files, as necessary.
*/
static int
xfs_growfs_rt_alloc_blocks(
struct xfs_rtgroup *rtg,
xfs_rfsblock_t nrblocks,
xfs_agblock_t rextsize,
xfs_extlen_t *nrbmblocks)
{
struct xfs_mount *mp = rtg_mount(rtg);
struct xfs_inode *rbmip = rtg->rtg_inodes[XFS_RTGI_BITMAP];
struct xfs_inode *rsumip = rtg->rtg_inodes[XFS_RTGI_SUMMARY];
xfs_extlen_t orbmblocks = 0;
xfs_extlen_t orsumblocks = 0;
struct xfs_mount *nmp;
int error = 0;
nmp = xfs_growfs_rt_alloc_fake_mount(mp, nrblocks, rextsize);
if (!nmp)
return -ENOMEM;
*nrbmblocks = nmp->m_sb.sb_rbmblocks;
if (xfs_has_rtgroups(mp)) {
/*
* For file systems with the rtgroups feature, the RT bitmap and
* summary are always fully allocated, which means that we never
* need to grow the existing files.
*
* But we have to be careful to only fill the bitmap until the
* end of the actually used range.
*/
if (rtg_rgno(rtg) == nmp->m_sb.sb_rgcount - 1)
*nrbmblocks = xfs_rtbitmap_blockcount_len(nmp,
xfs_last_rtgroup_extents(nmp));
if (mp->m_sb.sb_rgcount &&
rtg_rgno(rtg) == mp->m_sb.sb_rgcount - 1)
goto out_free;
} else {
/*
* Get the old block counts for bitmap and summary inodes.
* These can't change since other growfs callers are locked out.
*/
orbmblocks = XFS_B_TO_FSB(mp, rbmip->i_disk_size);
orsumblocks = XFS_B_TO_FSB(mp, rsumip->i_disk_size);
}
error = xfs_rtfile_initialize_blocks(rtg, XFS_RTGI_BITMAP, orbmblocks,
nmp->m_sb.sb_rbmblocks, NULL);
if (error)
goto out_free;
error = xfs_rtfile_initialize_blocks(rtg, XFS_RTGI_SUMMARY, orsumblocks,
nmp->m_rsumblocks, NULL);
out_free:
kfree(nmp);
return error;
}
static int
xfs_growfs_rtg(
struct xfs_mount *mp,
xfs_rgnumber_t rgno,
xfs_rfsblock_t nrblocks,
xfs_agblock_t rextsize)
{
uint8_t *old_rsum_cache = NULL;
xfs_extlen_t bmblocks;
xfs_fileoff_t bmbno;
struct xfs_rtgroup *rtg;
unsigned int i;
int error;
rtg = xfs_rtgroup_grab(mp, rgno);
if (!rtg)
return -EINVAL;
for (i = 0; i < XFS_RTGI_MAX; i++) {
error = xfs_rtginode_ensure(rtg, i);
if (error)
goto out_rele;
}
error = xfs_growfs_rt_alloc_blocks(rtg, nrblocks, rextsize, &bmblocks);
if (error)
goto out_rele;
if (bmblocks != rtg_mount(rtg)->m_sb.sb_rbmblocks) {
old_rsum_cache = rtg->rtg_rsum_cache;
error = xfs_alloc_rsum_cache(rtg, bmblocks);
if (error)
goto out_rele;
}
for (bmbno = xfs_last_rt_bmblock(rtg); bmbno < bmblocks; bmbno++) {
error = xfs_growfs_rt_bmblock(rtg, nrblocks, rextsize, bmbno);
if (error)
goto out_error;
}
if (old_rsum_cache)
kvfree(old_rsum_cache);
xfs_rtgroup_rele(rtg);
return 0;
out_error:
/*
* Reset rtg_extents to the old value if adding more blocks failed.
*/
xfs_rtgroup_calc_geometry(mp, rtg, rtg_rgno(rtg), mp->m_sb.sb_rgcount,
mp->m_sb.sb_rextents);
if (old_rsum_cache) {
kvfree(rtg->rtg_rsum_cache);
rtg->rtg_rsum_cache = old_rsum_cache;
}
out_rele:
xfs_rtgroup_rele(rtg);
return error;
}
static int
xfs_growfs_check_rtgeom(
const struct xfs_mount *mp,
xfs_rfsblock_t rblocks,
xfs_extlen_t rextsize)
{
struct xfs_mount *nmp;
int error = 0;
nmp = xfs_growfs_rt_alloc_fake_mount(mp, rblocks, rextsize);
if (!nmp)
return -ENOMEM;
/*
* 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 (nmp->m_rsumblocks > (mp->m_sb.sb_logblocks >> 1))
error = -EINVAL;
kfree(nmp);
return error;
}
/*
* Compute the new number of rt groups and ensure that /rtgroups exists.
*
* Changing the rtgroup size is not allowed (even if the rt volume hasn't yet
* been initialized) because the userspace ABI doesn't support it.
*/
static int
xfs_growfs_rt_prep_groups(
struct xfs_mount *mp,
xfs_rfsblock_t rblocks,
xfs_extlen_t rextsize,
xfs_rgnumber_t *new_rgcount)
{
int error;
*new_rgcount = howmany_64(rblocks, mp->m_sb.sb_rgextents * rextsize);
if (*new_rgcount > XFS_MAX_RGNUMBER)
return -EINVAL;
/* Make sure the /rtgroups dir has been created */
if (!mp->m_rtdirip) {
struct xfs_trans *tp;
error = xfs_trans_alloc_empty(mp, &tp);
if (error)
return error;
error = xfs_rtginode_load_parent(tp);
xfs_trans_cancel(tp);
if (error == -ENOENT)
error = xfs_rtginode_mkdir_parent(mp);
if (error)
return error;
}
return 0;
}
static bool
xfs_grow_last_rtg(
struct xfs_mount *mp)
{
if (!xfs_has_rtgroups(mp))
return true;
if (mp->m_sb.sb_rgcount == 0)
return false;
return xfs_rtgroup_extents(mp, mp->m_sb.sb_rgcount - 1) <=
mp->m_sb.sb_rgextents;
}
/*
* Grow the realtime area of the filesystem.
*/
int
xfs_growfs_rt(
struct xfs_mount *mp,
struct xfs_growfs_rt *in)
{
xfs_rgnumber_t old_rgcount = mp->m_sb.sb_rgcount;
xfs_rgnumber_t new_rgcount = 1;
xfs_rgnumber_t rgno;
struct xfs_buf *bp;
xfs_agblock_t old_rextsize = mp->m_sb.sb_rextsize;
int error;
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;
/* Shrink not supported. */
error = -EINVAL;
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_quota(mp) && !xfs_has_rtgroups(mp))
goto out_unlock;
if (xfs_has_rmapbt(mp) || xfs_has_reflink(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.
*/
error = -EINVAL;
if (in->newblocks < in->extsize)
goto out_unlock;
/* Make sure the new fs size won't cause problems with the log. */
error = xfs_growfs_check_rtgeom(mp, in->newblocks, in->extsize);
if (error)
goto out_unlock;
if (xfs_has_rtgroups(mp)) {
error = xfs_growfs_rt_prep_groups(mp, in->newblocks,
in->extsize, &new_rgcount);
if (error)
goto out_unlock;
}
if (xfs_grow_last_rtg(mp)) {
error = xfs_growfs_rtg(mp, old_rgcount - 1, in->newblocks,
in->extsize);
if (error)
goto out_unlock;
}
for (rgno = old_rgcount; rgno < new_rgcount; rgno++) {
xfs_rtbxlen_t rextents = div_u64(in->newblocks, in->extsize);
error = xfs_rtgroup_alloc(mp, rgno, new_rgcount, rextents);
if (error)
goto out_unlock;
error = xfs_growfs_rtg(mp, rgno, in->newblocks, in->extsize);
if (error) {
struct xfs_rtgroup *rtg;
rtg = xfs_rtgroup_grab(mp, rgno);
if (!WARN_ON_ONCE(!rtg)) {
xfs_rtunmount_rtg(rtg);
xfs_rtgroup_rele(rtg);
xfs_rtgroup_free(mp, rgno);
}
break;
}
}
if (!error && old_rextsize != in->extsize)
error = xfs_growfs_rt_fixup_extsize(mp);
/*
* Update secondary superblocks now the physical grow has completed.
*
* Also do this in case of an error as we might have already
* successfully updated one or more RTGs and incremented sb_rgcount.
*/
if (!xfs_is_shutdown(mp)) {
int error2 = xfs_update_secondary_sbs(mp);
if (!error)
error = error2;
}
out_unlock:
mutex_unlock(&mp->m_growlock);
return error;
}
/* Read the realtime superblock and attach it to the mount. */
int
xfs_rtmount_readsb(
struct xfs_mount *mp)
{
struct xfs_buf *bp;
int error;
if (!xfs_has_rtsb(mp))
return 0;
if (mp->m_sb.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;
}
/* m_blkbb_log is not set up yet */
error = xfs_buf_read_uncached(mp->m_rtdev_targp, XFS_RTSB_DADDR,
mp->m_sb.sb_blocksize >> BBSHIFT, XBF_NO_IOACCT, &bp,
&xfs_rtsb_buf_ops);
if (error) {
xfs_warn(mp, "rt sb validate failed with error %d.", error);
/* bad CRC means corrupted metadata */
if (error == -EFSBADCRC)
error = -EFSCORRUPTED;
return error;
}
mp->m_rtsb_bp = bp;
xfs_buf_unlock(bp);
return 0;
}
/* Detach the realtime superblock from the mount and free it. */
void
xfs_rtmount_freesb(
struct xfs_mount *mp)
{
struct xfs_buf *bp = mp->m_rtsb_bp;
if (!bp)
return;
xfs_buf_lock(bp);
mp->m_rtsb_bp = NULL;
xfs_buf_relse(bp);
}
/*
* 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 */
xfs_daddr_t d; /* address of last block of subvolume */
int error;
if (mp->m_sb.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_rsumblocks = xfs_rtsummary_blockcount(mp, &mp->m_rsumlevels);
/*
* 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_rtgroup *rtg,
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;
struct xfs_rtgroup *rtg = NULL;
while ((rtg = xfs_rtgroup_next(mp, rtg))) {
xfs_rtgroup_lock(rtg, XFS_RTGLOCK_BITMAP_SHARED);
error = xfs_rtalloc_query_all(rtg, NULL,
xfs_rtalloc_count_frextent, &val);
xfs_rtgroup_unlock(rtg, XFS_RTGLOCK_BITMAP_SHARED);
if (error) {
xfs_rtgroup_rele(rtg);
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_trans *tp,
struct xfs_inode *ip)
{
int error;
xfs_ilock(ip, XFS_ILOCK_EXCL);
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);
return error;
}
static int
xfs_rtmount_rtg(
struct xfs_mount *mp,
struct xfs_trans *tp,
struct xfs_rtgroup *rtg)
{
int error, i;
for (i = 0; i < XFS_RTGI_MAX; i++) {
error = xfs_rtginode_load(rtg, i, tp);
if (error)
return error;
if (rtg->rtg_inodes[i]) {
error = xfs_rtmount_iread_extents(tp,
rtg->rtg_inodes[i]);
if (error)
return error;
}
}
return xfs_alloc_rsum_cache(rtg, mp->m_sb.sb_rbmblocks);
}
/*
* Get the bitmap and summary inodes and the summary cache into the mount
* structure at mount time.
*/
int
xfs_rtmount_inodes(
struct xfs_mount *mp)
{
struct xfs_trans *tp;
struct xfs_rtgroup *rtg = NULL;
int error;
error = xfs_trans_alloc_empty(mp, &tp);
if (error)
return error;
if (xfs_has_rtgroups(mp) && mp->m_sb.sb_rgcount > 0) {
error = xfs_rtginode_load_parent(tp);
if (error)
goto out_cancel;
}
while ((rtg = xfs_rtgroup_next(mp, rtg))) {
error = xfs_rtmount_rtg(mp, tp, rtg);
if (error) {
xfs_rtgroup_rele(rtg);
xfs_rtunmount_inodes(mp);
break;
}
}
out_cancel:
xfs_trans_cancel(tp);
return error;
}
void
xfs_rtunmount_inodes(
struct xfs_mount *mp)
{
struct xfs_rtgroup *rtg = NULL;
while ((rtg = xfs_rtgroup_next(mp, rtg)))
xfs_rtunmount_rtg(rtg);
xfs_rtginode_irele(&mp->m_rtdirip);
}
/*
* 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(
struct xfs_rtgroup *rtg,
struct xfs_trans *tp,
xfs_rtxlen_t len) /* allocation length (rtextents) */
{
struct xfs_mount *mp = rtg_mount(rtg);
struct xfs_inode *rbmip = rtg->rtg_inodes[XFS_RTGI_BITMAP];
xfs_rtxnum_t b = 0; /* 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(rbmip, XFS_ILOCK_EXCL);
ts = inode_get_atime(VFS_I(rbmip));
if (!(rbmip->i_diflags & XFS_DIFLAG_NEWRTBM)) {
rbmip->i_diflags |= XFS_DIFLAG_NEWRTBM;
seq = 0;
} else {
seq = ts.tv_sec;
}
log2 = xfs_highbit64(seq);
if (log2 != -1) {
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(rbmip), ts);
xfs_trans_log_inode(tp, 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;
}
/* Given a free extent, find any part of it that isn't busy, if possible. */
STATIC bool
xfs_rtalloc_check_busy(
struct xfs_rtalloc_args *args,
xfs_rtxnum_t start,
xfs_rtxlen_t minlen_rtx,
xfs_rtxlen_t maxlen_rtx,
xfs_rtxlen_t len_rtx,
xfs_rtxlen_t prod,
xfs_rtxnum_t rtx,
xfs_rtxlen_t *reslen,
xfs_rtxnum_t *resrtx,
unsigned *busy_gen)
{
struct xfs_rtgroup *rtg = args->rtg;
struct xfs_mount *mp = rtg_mount(rtg);
xfs_agblock_t rgbno = xfs_rtx_to_rgbno(rtg, rtx);
xfs_rgblock_t min_rgbno = xfs_rtx_to_rgbno(rtg, start);
xfs_extlen_t minlen = xfs_rtxlen_to_extlen(mp, minlen_rtx);
xfs_extlen_t len = xfs_rtxlen_to_extlen(mp, len_rtx);
xfs_extlen_t diff;
bool busy;
busy = xfs_extent_busy_trim(rtg_group(rtg), minlen,
xfs_rtxlen_to_extlen(mp, maxlen_rtx), &rgbno, &len,
busy_gen);
/*
* If we have a largish extent that happens to start before min_rgbno,
* see if we can shift it into range...
*/
if (rgbno < min_rgbno && rgbno + len > min_rgbno) {
diff = min_rgbno - rgbno;
if (len > diff) {
rgbno += diff;
len -= diff;
}
}
if (prod > 1 && len >= minlen) {
xfs_rgblock_t aligned_rgbno = roundup(rgbno, prod);
diff = aligned_rgbno - rgbno;
*resrtx = xfs_rgbno_to_rtx(mp, aligned_rgbno);
*reslen = xfs_extlen_to_rtxlen(mp,
diff >= len ? 0 : len - diff);
} else {
*resrtx = xfs_rgbno_to_rtx(mp, rgbno);
*reslen = xfs_extlen_to_rtxlen(mp, len);
}
return busy;
}
/*
* Adjust the given free extent so that it isn't busy, or flush the log and
* wait for the space to become unbusy. Only needed for rtgroups.
*/
STATIC int
xfs_rtallocate_adjust_for_busy(
struct xfs_rtalloc_args *args,
xfs_rtxnum_t start,
xfs_rtxlen_t minlen,
xfs_rtxlen_t maxlen,
xfs_rtxlen_t *len,
xfs_rtxlen_t prod,
xfs_rtxnum_t *rtx)
{
xfs_rtxnum_t resrtx;
xfs_rtxlen_t reslen;
unsigned busy_gen;
bool busy;
int error;
again:
busy = xfs_rtalloc_check_busy(args, start, minlen, maxlen, *len, prod,
*rtx, &reslen, &resrtx, &busy_gen);
if (!busy)
return 0;
if (reslen < minlen || (start != 0 && resrtx != *rtx)) {
/*
* Enough of the extent was busy that we cannot satisfy the
* allocation, or this is a near allocation and the start of
* the extent is busy. Flush the log and wait for the busy
* situation to resolve.
*/
trace_xfs_rtalloc_extent_busy(args->rtg, start, minlen, maxlen,
*len, prod, *rtx, busy_gen);
error = xfs_extent_busy_flush(args->tp, rtg_group(args->rtg),
busy_gen, 0);
if (error)
return error;
goto again;
}
/* Some of the free space wasn't busy, hand that back to the caller. */
trace_xfs_rtalloc_extent_busy_trim(args->rtg, *rtx, *len, resrtx,
reslen);
*len = reslen;
*rtx = resrtx;
return 0;
}
static int
xfs_rtallocate_rtg(
struct xfs_trans *tp,
xfs_rgnumber_t rgno,
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;
args.rtg = xfs_rtgroup_grab(args.mp, rgno);
if (!args.rtg)
return -ENOSPC;
/*
* We need to lock out modifications to both the RT bitmap and summary
* inodes for finding free space in xfs_rtallocate_extent_{near,size}
* and join the bitmap and summary inodes for the actual allocation
* down in xfs_rtallocate_range.
*
* For RTG-enabled file system we don't want to join the inodes to the
* transaction until we are committed to allocate to allocate from this
* RTG so that only one inode of each type is locked at a time.
*
* But for pre-RTG file systems we need to already to join the bitmap
* inode to the transaction for xfs_rtpick_extent, which bumps the
* sequence number in it, so we'll have to join the inode to the
* transaction early here.
*
* This is all a bit messy, but at least the mess is contained in
* this function.
*/
if (!*rtlocked) {
xfs_rtgroup_lock(args.rtg, XFS_RTGLOCK_BITMAP);
if (!xfs_has_rtgroups(args.mp))
xfs_rtgroup_trans_join(tp, args.rtg,
XFS_RTGLOCK_BITMAP);
*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 (!xfs_has_rtgroups(args.mp) && initial_user_data)
start = xfs_rtpick_extent(args.rtg, 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) {
if (xfs_has_rtgroups(args.mp))
goto out_unlock;
goto out_release;
}
if (xfs_has_rtgroups(args.mp)) {
error = xfs_rtallocate_adjust_for_busy(&args, start, minlen,
maxlen, &len, prod, &rtx);
if (error)
goto out_unlock;
xfs_rtgroup_trans_join(tp, args.rtg, XFS_RTGLOCK_BITMAP);
}
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.rtg, rtx);
*blen = xfs_rtxlen_to_extlen(args.mp, len);
out_release:
xfs_rtgroup_rele(args.rtg);
xfs_rtbuf_cache_relse(&args);
return error;
out_unlock:
xfs_rtgroup_unlock(args.rtg, XFS_RTGLOCK_BITMAP);
*rtlocked = false;
goto out_release;
}
static int
xfs_rtallocate_rtgs(
struct xfs_trans *tp,
xfs_fsblock_t bno_hint,
xfs_rtxlen_t minlen,
xfs_rtxlen_t maxlen,
xfs_rtxlen_t prod,
bool wasdel,
bool initial_user_data,
xfs_rtblock_t *bno,
xfs_extlen_t *blen)
{
struct xfs_mount *mp = tp->t_mountp;
xfs_rgnumber_t start_rgno, rgno;
int error;
/*
* For now this just blindly iterates over the RTGs for an initial
* allocation. We could try to keep an in-memory rtg_longest member
* to avoid the locking when just looking for big enough free space,
* but for now this keeps things simple.
*/
if (bno_hint != NULLFSBLOCK)
start_rgno = xfs_rtb_to_rgno(mp, bno_hint);
else
start_rgno = (atomic_inc_return(&mp->m_rtgrotor) - 1) %
mp->m_sb.sb_rgcount;
rgno = start_rgno;
do {
bool rtlocked = false;
error = xfs_rtallocate_rtg(tp, rgno, bno_hint, minlen, maxlen,
prod, wasdel, initial_user_data, &rtlocked,
bno, blen);
if (error != -ENOSPC)
return error;
ASSERT(!rtlocked);
if (++rgno == mp->m_sb.sb_rgcount)
rgno = 0;
bno_hint = NULLFSBLOCK;
} while (rgno != start_rgno);
return -ENOSPC;
}
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;
if (xfs_has_rtgroups(ap->ip->i_mount)) {
error = xfs_rtallocate_rtgs(ap->tp, bno_hint, raminlen, ralen,
prod, ap->wasdel, initial_user_data,
&ap->blkno, &ap->length);
} else {
error = xfs_rtallocate_rtg(ap->tp, 0, 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;
}