// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
* Copyright (C) 2010 Red Hat, Inc.
* All Rights Reserved.
*/
#include "xfs_platform.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_mount.h"
#include "xfs_da_format.h"
#include "xfs_da_btree.h"
#include "xfs_inode.h"
#include "xfs_bmap_btree.h"
#include "xfs_quota.h"
#include "xfs_trans.h"
#include "xfs_qm.h"
#include "xfs_trans_space.h"
#include "xfs_rtbitmap.h"
#include "xfs_attr_item.h"
#include "xfs_log.h"
#include "xfs_defer.h"
#include "xfs_bmap_item.h"
#include "xfs_extfree_item.h"
#include "xfs_rmap_item.h"
#include "xfs_refcount_item.h"
#include "xfs_trace.h"
#define _ALLOC true
#define _FREE false
/*
* A buffer has a format structure overhead in the log in addition
* to the data, so we need to take this into account when reserving
* space in a transaction for a buffer. Round the space required up
* to a multiple of 128 bytes so that we don't change the historical
* reservation that has been used for this overhead.
*/
STATIC uint
xfs_buf_log_overhead(void)
{
return round_up(sizeof(struct xlog_op_header) +
sizeof(struct xfs_buf_log_format), 128);
}
/*
* Calculate out transaction log reservation per item in bytes.
*
* The nbufs argument is used to indicate the number of items that
* will be changed in a transaction. size is used to tell how many
* bytes should be reserved per item.
*/
STATIC uint
xfs_calc_buf_res(
uint nbufs,
uint size)
{
return nbufs * (size + xfs_buf_log_overhead());
}
/*
* Per-extent log reservation for the btree changes involved in freeing or
* allocating an extent. In classic XFS there were two trees that will be
* modified (bnobt + cntbt). With rmap enabled, there are three trees
* (rmapbt). The number of blocks reserved is based on the formula:
*
* num trees * ((2 blocks/level * max depth) - 1)
*
* Keep in mind that max depth is calculated separately for each type of tree.
*/
uint
xfs_allocfree_block_count(
struct xfs_mount *mp,
uint num_ops)
{
uint blocks;
blocks = num_ops * 2 * (2 * mp->m_alloc_maxlevels - 1);
if (xfs_has_rmapbt(mp))
blocks += num_ops * (2 * mp->m_rmap_maxlevels - 1);
return blocks;
}
/*
* Per-extent log reservation for refcount btree changes. These are never done
* in the same transaction as an allocation or a free, so we compute them
* separately.
*/
static unsigned int
xfs_refcountbt_block_count(
struct xfs_mount *mp,
unsigned int num_ops)
{
return num_ops * (2 * mp->m_refc_maxlevels - 1);
}
static unsigned int
xfs_rtrefcountbt_block_count(
struct xfs_mount *mp,
unsigned int num_ops)
{
return num_ops * (2 * mp->m_rtrefc_maxlevels - 1);
}
/*
* Logging inodes is really tricksy. They are logged in memory format,
* which means that what we write into the log doesn't directly translate into
* the amount of space they use on disk.
*
* Case in point - btree format forks in memory format use more space than the
* on-disk format. In memory, the buffer contains a normal btree block header so
* the btree code can treat it as though it is just another generic buffer.
* However, when we write it to the inode fork, we don't write all of this
* header as it isn't needed. e.g. the root is only ever in the inode, so
* there's no need for sibling pointers which would waste 16 bytes of space.
*
* Hence when we have an inode with a maximally sized btree format fork, then
* amount of information we actually log is greater than the size of the inode
* on disk. Hence we need an inode reservation function that calculates all this
* correctly. So, we log:
*
* - 4 log op headers for object
* - for the ilf, the inode core and 2 forks
* - inode log format object
* - the inode core
* - two inode forks containing bmap btree root blocks.
* - the btree data contained by both forks will fit into the inode size,
* hence when combined with the inode core above, we have a total of the
* actual inode size.
* - the BMBT headers need to be accounted separately, as they are
* additional to the records and pointers that fit inside the inode
* forks.
*/
STATIC uint
xfs_calc_inode_res(
struct xfs_mount *mp,
uint ninodes)
{
return ninodes *
(4 * sizeof(struct xlog_op_header) +
sizeof(struct xfs_inode_log_format) +
mp->m_sb.sb_inodesize +
2 * xfs_bmbt_block_len(mp));
}
/*
* Inode btree record insertion/removal modifies the inode btree and free space
* btrees (since the inobt does not use the agfl). This requires the following
* reservation:
*
* the inode btree: max depth * blocksize
* the allocation btrees: 2 trees * (max depth - 1) * block size
*
* The caller must account for SB and AG header modifications, etc.
*/
STATIC uint
xfs_calc_inobt_res(
struct xfs_mount *mp)
{
return xfs_calc_buf_res(M_IGEO(mp)->inobt_maxlevels,
XFS_FSB_TO_B(mp, 1)) +
xfs_calc_buf_res(xfs_allocfree_block_count(mp, 1),
XFS_FSB_TO_B(mp, 1));
}
/*
* The free inode btree is a conditional feature. The behavior differs slightly
* from that of the traditional inode btree in that the finobt tracks records
* for inode chunks with at least one free inode. A record can be removed from
* the tree during individual inode allocation. Therefore the finobt
* reservation is unconditional for both the inode chunk allocation and
* individual inode allocation (modify) cases.
*
* Behavior aside, the reservation for finobt modification is equivalent to the
* traditional inobt: cover a full finobt shape change plus block allocation.
*/
STATIC uint
xfs_calc_finobt_res(
struct xfs_mount *mp)
{
if (!xfs_has_finobt(mp))
return 0;
return xfs_calc_inobt_res(mp);
}
/*
* Calculate the reservation required to allocate or free an inode chunk. This
* includes:
*
* the allocation btrees: 2 trees * (max depth - 1) * block size
* the inode chunk: m_ino_geo.ialloc_blks * N
*
* The size N of the inode chunk reservation depends on whether it is for
* allocation or free and which type of create transaction is in use. An inode
* chunk free always invalidates the buffers and only requires reservation for
* headers (N == 0). An inode chunk allocation requires a chunk sized
* reservation on v4 and older superblocks to initialize the chunk. No chunk
* reservation is required for allocation on v5 supers, which use ordered
* buffers to initialize.
*/
STATIC uint
xfs_calc_inode_chunk_res(
struct xfs_mount *mp,
bool alloc)
{
uint res, size = 0;
res = xfs_calc_buf_res(xfs_allocfree_block_count(mp, 1),
XFS_FSB_TO_B(mp, 1));
if (alloc) {
/* icreate tx uses ordered buffers */
if (xfs_has_v3inodes(mp))
return res;
size = XFS_FSB_TO_B(mp, 1);
}
res += xfs_calc_buf_res(M_IGEO(mp)->ialloc_blks, size);
return res;
}
/*
* Per-extent log reservation for the btree changes involved in freeing or
* allocating a realtime extent. We have to be able to log as many rtbitmap
* blocks as needed to mark inuse XFS_BMBT_MAX_EXTLEN blocks' worth of realtime
* extents, as well as the realtime summary block (t1). Realtime rmap btree
* operations happen in a second transaction, so factor in a couple of rtrmapbt
* splits (t2).
*/
static unsigned int
xfs_rtalloc_block_count(
struct xfs_mount *mp,
unsigned int num_ops)
{
unsigned int rtbmp_blocks;
xfs_rtxlen_t rtxlen;
unsigned int t1, t2 = 0;
rtxlen = xfs_extlen_to_rtxlen(mp, XFS_MAX_BMBT_EXTLEN);
rtbmp_blocks = xfs_rtbitmap_blockcount_len(mp, rtxlen);
t1 = (rtbmp_blocks + 1) * num_ops;
if (xfs_has_rmapbt(mp))
t2 = num_ops * (2 * mp->m_rtrmap_maxlevels - 1);
return max(t1, t2);
}
/*
* Various log reservation values.
*
* These are based on the size of the file system block because that is what
* most transactions manipulate. Each adds in an additional 128 bytes per
* item logged to try to account for the overhead of the transaction mechanism.
*
* Note: Most of the reservations underestimate the number of allocation
* groups into which they could free extents in the xfs_defer_finish() call.
* This is because the number in the worst case is quite high and quite
* unusual. In order to fix this we need to change xfs_defer_finish() to free
* extents in only a single AG at a time. This will require changes to the
* EFI code as well, however, so that the EFI for the extents not freed is
* logged again in each transaction. See SGI PV #261917.
*
* Reservation functions here avoid a huge stack in xfs_trans_init due to
* register overflow from temporaries in the calculations.
*/
/*
* Finishing a data device refcount updates (t1):
* the agfs of the ags containing the blocks: nr_ops * sector size
* the refcount btrees: nr_ops * 1 trees * (2 * max depth - 1) * block size
*/
inline unsigned int
xfs_calc_finish_cui_reservation(
struct xfs_mount *mp,
unsigned int nr_ops)
{
if (!xfs_has_reflink(mp))
return 0;
return xfs_calc_buf_res(nr_ops, mp->m_sb.sb_sectsize) +
xfs_calc_buf_res(xfs_refcountbt_block_count(mp, nr_ops),
mp->m_sb.sb_blocksize);
}
/*
* Realtime refcount updates (t2);
* the rt refcount inode
* the rtrefcount btrees: nr_ops * 1 trees * (2 * max depth - 1) * block size
*/
inline unsigned int
xfs_calc_finish_rt_cui_reservation(
struct xfs_mount *mp,
unsigned int nr_ops)
{
if (!xfs_has_rtreflink(mp))
return 0;
return xfs_calc_inode_res(mp, 1) +
xfs_calc_buf_res(xfs_rtrefcountbt_block_count(mp, nr_ops),
mp->m_sb.sb_blocksize);
}
/*
* Compute the log reservation required to handle the refcount update
* transaction. Refcount updates are always done via deferred log items.
*
* This is calculated as the max of:
* Data device refcount updates (t1):
* the agfs of the ags containing the blocks: nr_ops * sector size
* the refcount btrees: nr_ops * 1 trees * (2 * max depth - 1) * block size
* Realtime refcount updates (t2);
* the rt refcount inode
* the rtrefcount btrees: nr_ops * 1 trees * (2 * max depth - 1) * block size
*/
static unsigned int
xfs_calc_refcountbt_reservation(
struct xfs_mount *mp,
unsigned int nr_ops)
{
unsigned int t1, t2;
t1 = xfs_calc_finish_cui_reservation(mp, nr_ops);
t2 = xfs_calc_finish_rt_cui_reservation(mp, nr_ops);
return max(t1, t2);
}
/*
* In a write transaction we can allocate a maximum of 2
* extents. This gives (t1):
* the inode getting the new extents: inode size
* the inode's bmap btree: max depth * block size
* the agfs of the ags from which the extents are allocated: 2 * sector
* the superblock free block counter: sector size
* the allocation btrees: 2 exts * 2 trees * (2 * max depth - 1) * block size
* Or, if we're writing to a realtime file (t2):
* the inode getting the new extents: inode size
* the inode's bmap btree: max depth * block size
* the agfs of the ags from which the extents are allocated: 2 * sector
* the superblock free block counter: sector size
* the realtime bitmap: ((XFS_BMBT_MAX_EXTLEN / rtextsize) / NBBY) bytes
* the realtime summary: 1 block
* the allocation btrees: 2 trees * (2 * max depth - 1) * block size
* And the bmap_finish transaction can free bmap blocks in a join (t3):
* the agfs of the ags containing the blocks: 2 * sector size
* the agfls of the ags containing the blocks: 2 * sector size
* the super block free block counter: sector size
* the allocation btrees: 2 exts * 2 trees * (2 * max depth - 1) * block size
* And any refcount updates that happen in a separate transaction (t4).
*/
STATIC uint
xfs_calc_write_reservation(
struct xfs_mount *mp,
bool for_minlogsize)
{
unsigned int t1, t2, t3, t4;
unsigned int blksz = XFS_FSB_TO_B(mp, 1);
t1 = xfs_calc_inode_res(mp, 1) +
xfs_calc_buf_res(XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK), blksz) +
xfs_calc_buf_res(3, mp->m_sb.sb_sectsize) +
xfs_calc_buf_res(xfs_allocfree_block_count(mp, 2), blksz);
if (xfs_has_realtime(mp)) {
t2 = xfs_calc_inode_res(mp, 1) +
xfs_calc_buf_res(XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK),
blksz) +
xfs_calc_buf_res(3, mp->m_sb.sb_sectsize) +
xfs_calc_buf_res(xfs_rtalloc_block_count(mp, 1), blksz) +
xfs_calc_buf_res(xfs_allocfree_block_count(mp, 1), blksz);
} else {
t2 = 0;
}
t3 = xfs_calc_buf_res(5, mp->m_sb.sb_sectsize) +
xfs_calc_buf_res(xfs_allocfree_block_count(mp, 2), blksz);
/*
* In the early days of reflink, we included enough reservation to log
* two refcountbt splits for each transaction. The codebase runs
* refcountbt updates in separate transactions now, so to compute the
* minimum log size, add the refcountbtree splits back to t1 and t3 and
* do not account them separately as t4. Reflink did not support
* realtime when the reservations were established, so no adjustment to
* t2 is needed.
*/
if (for_minlogsize) {
unsigned int adj = 0;
if (xfs_has_reflink(mp))
adj = xfs_calc_buf_res(
xfs_refcountbt_block_count(mp, 2),
blksz);
t1 += adj;
t3 += adj;
return XFS_DQUOT_LOGRES + max3(t1, t2, t3);
}
t4 = xfs_calc_refcountbt_reservation(mp, 1);
return XFS_DQUOT_LOGRES + max(t4, max3(t1, t2, t3));
}
unsigned int
xfs_calc_write_reservation_minlogsize(
struct xfs_mount *mp)
{
return xfs_calc_write_reservation(mp, true);
}
/*
* Finishing an EFI can free the blocks and bmap blocks (t2):
* the agf for each of the ags: nr * sector size
* the agfl for each of the ags: nr * sector size
* the super block to reflect the freed blocks: sector size
* worst case split in allocation btrees per extent assuming nr extents:
* nr exts * 2 trees * (2 * max depth - 1) * block size
*/
inline unsigned int
xfs_calc_finish_efi_reservation(
struct xfs_mount *mp,
unsigned int nr)
{
return xfs_calc_buf_res((2 * nr) + 1, mp->m_sb.sb_sectsize) +
xfs_calc_buf_res(xfs_allocfree_block_count(mp, nr),
mp->m_sb.sb_blocksize);
}
/*
* Or, if it's a realtime file (t3):
* the agf for each of the ags: 2 * sector size
* the agfl for each of the ags: 2 * sector size
* the super block to reflect the freed blocks: sector size
* the realtime bitmap:
* 2 exts * ((XFS_BMBT_MAX_EXTLEN / rtextsize) / NBBY) bytes
* the realtime summary: 2 exts * 1 block
* worst case split in allocation btrees per extent assuming 2 extents:
* 2 exts * 2 trees * (2 * max depth - 1) * block size
*/
inline unsigned int
xfs_calc_finish_rt_efi_reservation(
struct xfs_mount *mp,
unsigned int nr)
{
if (!xfs_has_realtime(mp))
return 0;
return xfs_calc_buf_res((2 * nr) + 1, mp->m_sb.sb_sectsize) +
xfs_calc_buf_res(xfs_rtalloc_block_count(mp, nr),
mp->m_sb.sb_blocksize) +
xfs_calc_buf_res(xfs_allocfree_block_count(mp, nr),
mp->m_sb.sb_blocksize);
}
/*
* Finishing an RUI is the same as an EFI. We can split the rmap btree twice
* on each end of the record, and that can cause the AGFL to be refilled or
* emptied out.
*/
inline unsigned int
xfs_calc_finish_rui_reservation(
struct xfs_mount *mp,
unsigned int nr)
{
if (!xfs_has_rmapbt(mp))
return 0;
return xfs_calc_finish_efi_reservation(mp, nr);
}
/*
* Finishing an RUI is the same as an EFI. We can split the rmap btree twice
* on each end of the record, and that can cause the AGFL to be refilled or
* emptied out.
*/
inline unsigned int
xfs_calc_finish_rt_rui_reservation(
struct xfs_mount *mp,
unsigned int nr)
{
if (!xfs_has_rtrmapbt(mp))
return 0;
return xfs_calc_finish_rt_efi_reservation(mp, nr);
}
/*
* In finishing a BUI, we can modify:
* the inode being truncated: inode size
* dquots
* the inode's bmap btree: (max depth + 1) * block size
*/
inline unsigned int
xfs_calc_finish_bui_reservation(
struct xfs_mount *mp,
unsigned int nr)
{
return xfs_calc_inode_res(mp, 1) + XFS_DQUOT_LOGRES +
xfs_calc_buf_res(XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK) + 1,
mp->m_sb.sb_blocksize);
}
/*
* In truncating a file we free up to two extents at once. We can modify (t1):
* the inode being truncated: inode size
* the inode's bmap btree: (max depth + 1) * block size
* And the bmap_finish transaction can free the blocks and bmap blocks (t2):
* the agf for each of the ags: 4 * sector size
* the agfl for each of the ags: 4 * sector size
* the super block to reflect the freed blocks: sector size
* worst case split in allocation btrees per extent assuming 4 extents:
* 4 exts * 2 trees * (2 * max depth - 1) * block size
* Or, if it's a realtime file (t3):
* the agf for each of the ags: 2 * sector size
* the agfl for each of the ags: 2 * sector size
* the super block to reflect the freed blocks: sector size
* the realtime bitmap:
* 2 exts * ((XFS_BMBT_MAX_EXTLEN / rtextsize) / NBBY) bytes
* the realtime summary: 2 exts * 1 block
* worst case split in allocation btrees per extent assuming 2 extents:
* 2 exts * 2 trees * (2 * max depth - 1) * block size
* And any refcount updates that happen in a separate transaction (t4).
*/
STATIC uint
xfs_calc_itruncate_reservation(
struct xfs_mount *mp,
bool for_minlogsize)
{
unsigned int t1, t2, t3, t4;
unsigned int blksz = XFS_FSB_TO_B(mp, 1);
t1 = xfs_calc_inode_res(mp, 1) +
xfs_calc_buf_res(XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK) + 1, blksz);
t2 = xfs_calc_finish_efi_reservation(mp, 4);
t3 = xfs_calc_finish_rt_efi_reservation(mp, 2);
/*
* In the early days of reflink, we included enough reservation to log
* four refcountbt splits in the same transaction as bnobt/cntbt
* updates. The codebase runs refcountbt updates in separate
* transactions now, so to compute the minimum log size, add the
* refcount btree splits back here and do not compute them separately
* as t4. Reflink did not support realtime when the reservations were
* established, so do not adjust t3.
*/
if (for_minlogsize) {
if (xfs_has_reflink(mp))
t2 += xfs_calc_buf_res(
xfs_refcountbt_block_count(mp, 4),
blksz);
return XFS_DQUOT_LOGRES + max3(t1, t2, t3);
}
t4 = xfs_calc_refcountbt_reservation(mp, 2);
return XFS_DQUOT_LOGRES + max(t4, max3(t1, t2, t3));
}
unsigned int
xfs_calc_itruncate_reservation_minlogsize(
struct xfs_mount *mp)
{
return xfs_calc_itruncate_reservation(mp, true);
}
static inline unsigned int xfs_calc_pptr_link_overhead(void)
{
return sizeof(struct xfs_attri_log_format) +
xlog_calc_iovec_len(sizeof(struct xfs_parent_rec)) +
xlog_calc_iovec_len(MAXNAMELEN - 1);
}
static inline unsigned int xfs_calc_pptr_unlink_overhead(void)
{
return sizeof(struct xfs_attri_log_format) +
xlog_calc_iovec_len(sizeof(struct xfs_parent_rec)) +
xlog_calc_iovec_len(MAXNAMELEN - 1);
}
static inline unsigned int xfs_calc_pptr_replace_overhead(void)
{
return sizeof(struct xfs_attri_log_format) +
xlog_calc_iovec_len(sizeof(struct xfs_parent_rec)) +
xlog_calc_iovec_len(MAXNAMELEN - 1) +
xlog_calc_iovec_len(sizeof(struct xfs_parent_rec)) +
xlog_calc_iovec_len(MAXNAMELEN - 1);
}
/*
* In renaming a files we can modify:
* the five inodes involved: 5 * inode size
* the two directory btrees: 2 * (max depth + v2) * dir block size
* the two directory bmap btrees: 2 * max depth * block size
* And the bmap_finish transaction can free dir and bmap blocks (two sets
* of bmap blocks) giving (t2):
* the agf for the ags in which the blocks live: 3 * sector size
* the agfl for the ags in which the blocks live: 3 * sector size
* the superblock for the free block count: sector size
* the allocation btrees: 3 exts * 2 trees * (2 * max depth - 1) * block size
* If parent pointers are enabled (t3), then each transaction in the chain
* must be capable of setting or removing the extended attribute
* containing the parent information. It must also be able to handle
* the three xattr intent items that track the progress of the parent
* pointer update.
*/
STATIC uint
xfs_calc_rename_reservation(
struct xfs_mount *mp)
{
unsigned int overhead = XFS_DQUOT_LOGRES;
struct xfs_trans_resv *resp = M_RES(mp);
unsigned int t1, t2, t3 = 0;
t1 = xfs_calc_inode_res(mp, 5) +
xfs_calc_buf_res(2 * XFS_DIROP_LOG_COUNT(mp),
XFS_FSB_TO_B(mp, 1));
t2 = xfs_calc_finish_efi_reservation(mp, 3);
if (xfs_has_parent(mp)) {
unsigned int rename_overhead, exchange_overhead;
t3 = max(resp->tr_attrsetm.tr_logres,
resp->tr_attrrm.tr_logres);
/*
* For a standard rename, the three xattr intent log items
* are (1) replacing the pptr for the source file; (2)
* removing the pptr on the dest file; and (3) adding a
* pptr for the whiteout file in the src dir.
*
* For an RENAME_EXCHANGE, there are two xattr intent
* items to replace the pptr for both src and dest
* files. Link counts don't change and there is no
* whiteout.
*
* In the worst case we can end up relogging all log
* intent items to allow the log tail to move ahead, so
* they become overhead added to each transaction in a
* processing chain.
*/
rename_overhead = xfs_calc_pptr_replace_overhead() +
xfs_calc_pptr_unlink_overhead() +
xfs_calc_pptr_link_overhead();
exchange_overhead = 2 * xfs_calc_pptr_replace_overhead();
overhead += max(rename_overhead, exchange_overhead);
}
return overhead + max3(t1, t2, t3);
}
static inline unsigned int
xfs_rename_log_count(
struct xfs_mount *mp,
struct xfs_trans_resv *resp)
{
/* One for the rename, one more for freeing blocks */
unsigned int ret = XFS_RENAME_LOG_COUNT;
/*
* Pre-reserve enough log reservation to handle the transaction
* rolling needed to remove or add one parent pointer.
*/
if (xfs_has_parent(mp))
ret += max(resp->tr_attrsetm.tr_logcount,
resp->tr_attrrm.tr_logcount);
return ret;
}
/*
* For removing an inode from unlinked list at first, we can modify:
* the agi hash list and counters: sector size
* the on disk inode before ours in the agi hash list: inode cluster size
* the on disk inode in the agi hash list: inode cluster size
*/
STATIC uint
xfs_calc_iunlink_remove_reservation(
struct xfs_mount *mp)
{
return xfs_calc_buf_res(1, mp->m_sb.sb_sectsize) +
2 * M_IGEO(mp)->inode_cluster_size;
}
static inline unsigned int
xfs_link_log_count(
struct xfs_mount *mp,
struct xfs_trans_resv *resp)
{
unsigned int ret = XFS_LINK_LOG_COUNT;
/*
* Pre-reserve enough log reservation to handle the transaction
* rolling needed to add one parent pointer.
*/
if (xfs_has_parent(mp))
ret += resp->tr_attrsetm.tr_logcount;
return ret;
}
/*
* For creating a link to an inode:
* the parent directory inode: inode size
* the linked inode: inode size
* the directory btree could split: (max depth + v2) * dir block size
* the directory bmap btree could join or split: (max depth + v2) * blocksize
* And the bmap_finish transaction can free some bmap blocks giving:
* the agf for the ag in which the blocks live: sector size
* the agfl for the ag in which the blocks live: sector size
* the superblock for the free block count: sector size
* the allocation btrees: 2 trees * (2 * max depth - 1) * block size
*/
STATIC uint
xfs_calc_link_reservation(
struct xfs_mount *mp)
{
unsigned int overhead = XFS_DQUOT_LOGRES;
struct xfs_trans_resv *resp = M_RES(mp);
unsigned int t1, t2, t3 = 0;
overhead += xfs_calc_iunlink_remove_reservation(mp);
t1 = xfs_calc_inode_res(mp, 2) +
xfs_calc_buf_res(XFS_DIROP_LOG_COUNT(mp), XFS_FSB_TO_B(mp, 1));
t2 = xfs_calc_finish_efi_reservation(mp, 1);
if (xfs_has_parent(mp)) {
t3 = resp->tr_attrsetm.tr_logres;
overhead += xfs_calc_pptr_link_overhead();
}
return overhead + max3(t1, t2, t3);
}
/*
* For adding an inode to unlinked list we can modify:
* the agi hash list: sector size
* the on disk inode: inode cluster size
*/
STATIC uint
xfs_calc_iunlink_add_reservation(xfs_mount_t *mp)
{
return xfs_calc_buf_res(1, mp->m_sb.sb_sectsize) +
M_IGEO(mp)->inode_cluster_size;
}
static inline unsigned int
xfs_remove_log_count(
struct xfs_mount *mp,
struct xfs_trans_resv *resp)
{
unsigned int ret = XFS_REMOVE_LOG_COUNT;
/*
* Pre-reserve enough log reservation to handle the transaction
* rolling needed to add one parent pointer.
*/
if (xfs_has_parent(mp))
ret += resp->tr_attrrm.tr_logcount;
return ret;
}
/*
* For removing a directory entry we can modify:
* the parent directory inode: inode size
* the removed inode: inode size
* the directory btree could join: (max depth + v2) * dir block size
* the directory bmap btree could join or split: (max depth + v2) * blocksize
* And the bmap_finish transaction can free the dir and bmap blocks giving:
* the agf for the ag in which the blocks live: 2 * sector size
* the agfl for the ag in which the blocks live: 2 * sector size
* the superblock for the free block count: sector size
* the allocation btrees: 2 exts * 2 trees * (2 * max depth - 1) * block size
*/
STATIC uint
xfs_calc_remove_reservation(
struct xfs_mount *mp)
{
unsigned int overhead = XFS_DQUOT_LOGRES;
struct xfs_trans_resv *resp = M_RES(mp);
unsigned int t1, t2, t3 = 0;
overhead += xfs_calc_iunlink_add_reservation(mp);
t1 = xfs_calc_inode_res(mp, 2) +
xfs_calc_buf_res(XFS_DIROP_LOG_COUNT(mp), XFS_FSB_TO_B(mp, 1));
t2 = xfs_calc_finish_efi_reservation(mp, 2);
if (xfs_has_parent(mp)) {
t3 = resp->tr_attrrm.tr_logres;
overhead += xfs_calc_pptr_unlink_overhead();
}
return overhead + max3(t1, t2, t3);
}
/*
* For create, break it in to the two cases that the transaction
* covers. We start with the modify case - allocation done by modification
* of the state of existing inodes - and the allocation case.
*/
/*
* For create we can modify:
* the parent directory inode: inode size
* the new inode: inode size
* the inode btree entry: block size
* the superblock for the nlink flag: sector size
* the directory btree: (max depth + v2) * dir block size
* the directory inode's bmap btree: (max depth + v2) * block size
* the finobt (record modification and allocation btrees)
*/
STATIC uint
xfs_calc_create_resv_modify(
struct xfs_mount *mp)
{
return xfs_calc_inode_res(mp, 2) +
xfs_calc_buf_res(1, mp->m_sb.sb_sectsize) +
(uint)XFS_FSB_TO_B(mp, 1) +
xfs_calc_buf_res(XFS_DIROP_LOG_COUNT(mp), XFS_FSB_TO_B(mp, 1)) +
xfs_calc_finobt_res(mp);
}
/*
* For icreate we can allocate some inodes giving:
* the agi and agf of the ag getting the new inodes: 2 * sectorsize
* the superblock for the nlink flag: sector size
* the inode chunk (allocation, optional init)
* the inobt (record insertion)
* the finobt (optional, record insertion)
*/
STATIC uint
xfs_calc_icreate_resv_alloc(
struct xfs_mount *mp)
{
return xfs_calc_buf_res(2, mp->m_sb.sb_sectsize) +
mp->m_sb.sb_sectsize +
xfs_calc_inode_chunk_res(mp, _ALLOC) +
xfs_calc_inobt_res(mp) +
xfs_calc_finobt_res(mp);
}
static inline unsigned int
xfs_icreate_log_count(
struct xfs_mount *mp,
struct xfs_trans_resv *resp)
{
unsigned int ret = XFS_CREATE_LOG_COUNT;
/*
* Pre-reserve enough log reservation to handle the transaction
* rolling needed to add one parent pointer.
*/
if (xfs_has_parent(mp))
ret += resp->tr_attrsetm.tr_logcount;
return ret;
}
STATIC uint
xfs_calc_icreate_reservation(
struct xfs_mount *mp)
{
struct xfs_trans_resv *resp = M_RES(mp);
unsigned int overhead = XFS_DQUOT_LOGRES;
unsigned int t1, t2, t3 = 0;
t1 = xfs_calc_icreate_resv_alloc(mp);
t2 = xfs_calc_create_resv_modify(mp);
if (xfs_has_parent(mp)) {
t3 = resp->tr_attrsetm.tr_logres;
overhead += xfs_calc_pptr_link_overhead();
}
return overhead + max3(t1, t2, t3);
}
STATIC uint
xfs_calc_create_tmpfile_reservation(
struct xfs_mount *mp)
{
uint res = XFS_DQUOT_LOGRES;
res += xfs_calc_icreate_resv_alloc(mp);
return res + xfs_calc_iunlink_add_reservation(mp);
}
static inline unsigned int
xfs_mkdir_log_count(
struct xfs_mount *mp,
struct xfs_trans_resv *resp)
{
unsigned int ret = XFS_MKDIR_LOG_COUNT;
/*
* Pre-reserve enough log reservation to handle the transaction
* rolling needed to add one parent pointer.
*/
if (xfs_has_parent(mp))
ret += resp->tr_attrsetm.tr_logcount;
return ret;
}
/*
* Making a new directory is the same as creating a new file.
*/
STATIC uint
xfs_calc_mkdir_reservation(
struct xfs_mount *mp)
{
return xfs_calc_icreate_reservation(mp);
}
static inline unsigned int
xfs_symlink_log_count(
struct xfs_mount *mp,
struct xfs_trans_resv *resp)
{
unsigned int ret = XFS_SYMLINK_LOG_COUNT;
/*
* Pre-reserve enough log reservation to handle the transaction
* rolling needed to add one parent pointer.
*/
if (xfs_has_parent(mp))
ret += resp->tr_attrsetm.tr_logcount;
return ret;
}
/*
* Making a new symplink is the same as creating a new file, but
* with the added blocks for remote symlink data which can be up to 1kB in
* length (XFS_SYMLINK_MAXLEN).
*/
STATIC uint
xfs_calc_symlink_reservation(
struct xfs_mount *mp)
{
return xfs_calc_icreate_reservation(mp) +
xfs_calc_buf_res(1, XFS_SYMLINK_MAXLEN);
}
/*
* In freeing an inode we can modify:
* the inode being freed: inode size
* the super block free inode counter, AGF and AGFL: sector size
* the on disk inode (agi unlinked list removal)
* the inode chunk (invalidated, headers only)
* the inode btree
* the finobt (record insertion, removal or modification)
*
* Note that the inode chunk res. includes an allocfree res. for freeing of the
* inode chunk. This is technically extraneous because the inode chunk free is
* deferred (it occurs after a transaction roll). Include the extra reservation
* anyways since we've had reports of ifree transaction overruns due to too many
* agfl fixups during inode chunk frees.
*/
STATIC uint
xfs_calc_ifree_reservation(
struct xfs_mount *mp)
{
return XFS_DQUOT_LOGRES +
xfs_calc_inode_res(mp, 1) +
xfs_calc_buf_res(3, mp->m_sb.sb_sectsize) +
xfs_calc_iunlink_remove_reservation(mp) +
xfs_calc_inode_chunk_res(mp, _FREE) +
xfs_calc_inobt_res(mp) +
xfs_calc_finobt_res(mp);
}
/*
* When only changing the inode we log the inode and possibly the superblock
* We also add a bit of slop for the transaction stuff.
*/
STATIC uint
xfs_calc_ichange_reservation(
struct xfs_mount *mp)
{
return XFS_DQUOT_LOGRES +
xfs_calc_inode_res(mp, 1) +
xfs_calc_buf_res(1, mp->m_sb.sb_sectsize);
}
/*
* Growing the data section of the filesystem.
* superblock
* agi and agf
* allocation btrees
*/
STATIC uint
xfs_calc_growdata_reservation(
struct xfs_mount *mp)
{
return xfs_calc_buf_res(3, mp->m_sb.sb_sectsize) +
xfs_calc_buf_res(xfs_allocfree_block_count(mp, 1),
XFS_FSB_TO_B(mp, 1));
}
/*
* Growing the rt section of the filesystem.
* In the first set of transactions (ALLOC) we allocate space to the
* bitmap or summary files.
* superblock: sector size
* agf of the ag from which the extent is allocated: sector size
* bmap btree for bitmap/summary inode: max depth * blocksize
* bitmap/summary inode: inode size
* allocation btrees for 1 block alloc: 2 * (2 * maxdepth - 1) * blocksize
*/
STATIC uint
xfs_calc_growrtalloc_reservation(
struct xfs_mount *mp)
{
return xfs_calc_buf_res(2, mp->m_sb.sb_sectsize) +
xfs_calc_buf_res(XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK),
XFS_FSB_TO_B(mp, 1)) +
xfs_calc_inode_res(mp, 1) +
xfs_calc_buf_res(xfs_allocfree_block_count(mp, 1),
XFS_FSB_TO_B(mp, 1));
}
/*
* Growing the rt section of the filesystem.
* In the second set of transactions (ZERO) we zero the new metadata blocks.
* one bitmap/summary block: blocksize
*/
STATIC uint
xfs_calc_growrtzero_reservation(
struct xfs_mount *mp)
{
return xfs_calc_buf_res(1, mp->m_sb.sb_blocksize);
}
/*
* Growing the rt section of the filesystem.
* In the third set of transactions (FREE) we update metadata without
* allocating any new blocks.
* superblock: sector size
* bitmap inode: inode size
* summary inode: inode size
* one bitmap block: blocksize
* summary blocks: new summary size
*/
STATIC uint
xfs_calc_growrtfree_reservation(
struct xfs_mount *mp)
{
return xfs_calc_buf_res(1, mp->m_sb.sb_sectsize) +
xfs_calc_inode_res(mp, 2) +
xfs_calc_buf_res(1, mp->m_sb.sb_blocksize) +
xfs_calc_buf_res(1, XFS_FSB_TO_B(mp, mp->m_rsumblocks));
}
/*
* Logging the inode modification timestamp on a synchronous write.
* inode
*/
STATIC uint
xfs_calc_swrite_reservation(
struct xfs_mount *mp)
{
return xfs_calc_inode_res(mp, 1);
}
/*
* Logging the inode mode bits when writing a setuid/setgid file
* inode
*/
STATIC uint
xfs_calc_writeid_reservation(
struct xfs_mount *mp)
{
return xfs_calc_inode_res(mp, 1);
}
/*
* Converting the inode from non-attributed to attributed.
* the inode being converted: inode size
* agf block and superblock (for block allocation)
* the new block (directory sized)
* bmap blocks for the new directory block
* allocation btrees
*/
STATIC uint
xfs_calc_addafork_reservation(
struct xfs_mount *mp)
{
return XFS_DQUOT_LOGRES +
xfs_calc_inode_res(mp, 1) +
xfs_calc_buf_res(2, mp->m_sb.sb_sectsize) +
xfs_calc_buf_res(1, mp->m_dir_geo->blksize) +
xfs_calc_buf_res(XFS_DAENTER_BMAP1B(mp, XFS_DATA_FORK) + 1,
XFS_FSB_TO_B(mp, 1)) +
xfs_calc_buf_res(xfs_allocfree_block_count(mp, 1),
XFS_FSB_TO_B(mp, 1));
}
/*
* Removing the attribute fork of a file
* the inode being truncated: inode size
* the inode's bmap btree: max depth * block size
* And the bmap_finish transaction can free the blocks and bmap blocks:
* the agf for each of the ags: 4 * sector size
* the agfl for each of the ags: 4 * sector size
* the super block to reflect the freed blocks: sector size
* worst case split in allocation btrees per extent assuming 4 extents:
* 4 exts * 2 trees * (2 * max depth - 1) * block size
*/
STATIC uint
xfs_calc_attrinval_reservation(
struct xfs_mount *mp)
{
return max((xfs_calc_inode_res(mp, 1) +
xfs_calc_buf_res(XFS_BM_MAXLEVELS(mp, XFS_ATTR_FORK),
XFS_FSB_TO_B(mp, 1))),
(xfs_calc_buf_res(9, mp->m_sb.sb_sectsize) +
xfs_calc_buf_res(xfs_allocfree_block_count(mp, 4),
XFS_FSB_TO_B(mp, 1))));
}
/*
* Setting an attribute at mount time.
* the inode getting the attribute
* the superblock for allocations
* the agfs extents are allocated from
* the attribute btree * max depth
* the inode allocation btree
* Since attribute transaction space is dependent on the size of the attribute,
* the calculation is done partially at mount time and partially at runtime(see
* below).
*/
STATIC uint
xfs_calc_attrsetm_reservation(
struct xfs_mount *mp)
{
return XFS_DQUOT_LOGRES +
xfs_calc_inode_res(mp, 1) +
xfs_calc_buf_res(1, mp->m_sb.sb_sectsize) +
xfs_calc_buf_res(XFS_DA_NODE_MAXDEPTH, XFS_FSB_TO_B(mp, 1));
}
/*
* Setting an attribute at runtime, transaction space unit per block.
* the superblock for allocations: sector size
* the inode bmap btree could join or split: max depth * block size
* Since the runtime attribute transaction space is dependent on the total
* blocks needed for the 1st bmap, here we calculate out the space unit for
* one block so that the caller could figure out the total space according
* to the attibute extent length in blocks by:
* ext * M_RES(mp)->tr_attrsetrt.tr_logres
*/
STATIC uint
xfs_calc_attrsetrt_reservation(
struct xfs_mount *mp)
{
return xfs_calc_buf_res(1, mp->m_sb.sb_sectsize) +
xfs_calc_buf_res(XFS_BM_MAXLEVELS(mp, XFS_ATTR_FORK),
XFS_FSB_TO_B(mp, 1));
}
/*
* Removing an attribute.
* the inode: inode size
* the attribute btree could join: max depth * block size
* the inode bmap btree could join or split: max depth * block size
* And the bmap_finish transaction can free the attr blocks freed giving:
* the agf for the ag in which the blocks live: 2 * sector size
* the agfl for the ag in which the blocks live: 2 * sector size
* the superblock for the free block count: sector size
* the allocation btrees: 2 exts * 2 trees * (2 * max depth - 1) * block size
*/
STATIC uint
xfs_calc_attrrm_reservation(
struct xfs_mount *mp)
{
return XFS_DQUOT_LOGRES +
max((xfs_calc_inode_res(mp, 1) +
xfs_calc_buf_res(XFS_DA_NODE_MAXDEPTH,
XFS_FSB_TO_B(mp, 1)) +
(uint)XFS_FSB_TO_B(mp,
XFS_BM_MAXLEVELS(mp, XFS_ATTR_FORK)) +
xfs_calc_buf_res(XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK), 0)),
(xfs_calc_buf_res(5, mp->m_sb.sb_sectsize) +
xfs_calc_buf_res(xfs_allocfree_block_count(mp, 2),
XFS_FSB_TO_B(mp, 1))));
}
/*
* Clearing a bad agino number in an agi hash bucket.
*/
STATIC uint
xfs_calc_clear_agi_bucket_reservation(
struct xfs_mount *mp)
{
return xfs_calc_buf_res(1, mp->m_sb.sb_sectsize);
}
/*
* Adjusting quota limits.
* the disk quota buffer: sizeof(struct xfs_disk_dquot)
*/
STATIC uint
xfs_calc_qm_setqlim_reservation(void)
{
return xfs_calc_buf_res(1, sizeof(struct xfs_disk_dquot));
}
/*
* Allocating quota on disk if needed.
* the write transaction log space for quota file extent allocation
* the unit of quota allocation: one system block size
*/
STATIC uint
xfs_calc_qm_dqalloc_reservation(
struct xfs_mount *mp,
bool for_minlogsize)
{
return xfs_calc_write_reservation(mp, for_minlogsize) +
xfs_calc_buf_res(1,
XFS_FSB_TO_B(mp, XFS_DQUOT_CLUSTER_SIZE_FSB) - 1);
}
unsigned int
xfs_calc_qm_dqalloc_reservation_minlogsize(
struct xfs_mount *mp)
{
return xfs_calc_qm_dqalloc_reservation(mp, true);
}
/*
* Syncing the incore super block changes to disk.
* the super block to reflect the changes: sector size
*/
STATIC uint
xfs_calc_sb_reservation(
struct xfs_mount *mp)
{
return xfs_calc_buf_res(1, mp->m_sb.sb_sectsize);
}
/*
* Namespace reservations.
*
* These get tricky when parent pointers are enabled as we have attribute
* modifications occurring from within these transactions. Rather than confuse
* each of these reservation calculations with the conditional attribute
* reservations, add them here in a clear and concise manner. This requires that
* the attribute reservations have already been calculated.
*
* Note that we only include the static attribute reservation here; the runtime
* reservation will have to be modified by the size of the attributes being
* added/removed/modified. See the comments on the attribute reservation
* calculations for more details.
*/
STATIC void
xfs_calc_namespace_reservations(
struct xfs_mount *mp,
struct xfs_trans_resv *resp)
{
ASSERT(resp->tr_attrsetm.tr_logres > 0);
resp->tr_rename.tr_logres = xfs_calc_rename_reservation(mp);
resp->tr_rename.tr_logcount = xfs_rename_log_count(mp, resp);
resp->tr_rename.tr_logflags |= XFS_TRANS_PERM_LOG_RES;
resp->tr_link.tr_logres = xfs_calc_link_reservation(mp);
resp->tr_link.tr_logcount = xfs_link_log_count(mp, resp);
resp->tr_link.tr_logflags |= XFS_TRANS_PERM_LOG_RES;
resp->tr_remove.tr_logres = xfs_calc_remove_reservation(mp);
resp->tr_remove.tr_logcount = xfs_remove_log_count(mp, resp);
resp->tr_remove.tr_logflags |= XFS_TRANS_PERM_LOG_RES;
resp->tr_symlink.tr_logres = xfs_calc_symlink_reservation(mp);
resp->tr_symlink.tr_logcount = xfs_symlink_log_count(mp, resp);
resp->tr_symlink.tr_logflags |= XFS_TRANS_PERM_LOG_RES;
resp->tr_create.tr_logres = xfs_calc_icreate_reservation(mp);
resp->tr_create.tr_logcount = xfs_icreate_log_count(mp, resp);
resp->tr_create.tr_logflags |= XFS_TRANS_PERM_LOG_RES;
resp->tr_mkdir.tr_logres = xfs_calc_mkdir_reservation(mp);
resp->tr_mkdir.tr_logcount = xfs_mkdir_log_count(mp, resp);
resp->tr_mkdir.tr_logflags |= XFS_TRANS_PERM_LOG_RES;
}
STATIC void
xfs_calc_default_atomic_ioend_reservation(
struct xfs_mount *mp,
struct xfs_trans_resv *resp)
{
/* Pick a default that will scale reasonably for the log size. */
resp->tr_atomic_ioend = resp->tr_itruncate;
}
void
xfs_trans_resv_calc(
struct xfs_mount *mp,
struct xfs_trans_resv *resp)
{
int logcount_adj = 0;
/*
* The following transactions are logged in physical format and
* require a permanent reservation on space.
*/
resp->tr_write.tr_logres = xfs_calc_write_reservation(mp, false);
resp->tr_write.tr_logcount = XFS_WRITE_LOG_COUNT;
resp->tr_write.tr_logflags |= XFS_TRANS_PERM_LOG_RES;
resp->tr_itruncate.tr_logres = xfs_calc_itruncate_reservation(mp, false);
resp->tr_itruncate.tr_logcount = XFS_ITRUNCATE_LOG_COUNT;
resp->tr_itruncate.tr_logflags |= XFS_TRANS_PERM_LOG_RES;
resp->tr_create_tmpfile.tr_logres =
xfs_calc_create_tmpfile_reservation(mp);
resp->tr_create_tmpfile.tr_logcount = XFS_CREATE_TMPFILE_LOG_COUNT;
resp->tr_create_tmpfile.tr_logflags |= XFS_TRANS_PERM_LOG_RES;
resp->tr_ifree.tr_logres = xfs_calc_ifree_reservation(mp);
resp->tr_ifree.tr_logcount = XFS_INACTIVE_LOG_COUNT;
resp->tr_ifree.tr_logflags |= XFS_TRANS_PERM_LOG_RES;
resp->tr_addafork.tr_logres = xfs_calc_addafork_reservation(mp);
resp->tr_addafork.tr_logcount = XFS_ADDAFORK_LOG_COUNT;
resp->tr_addafork.tr_logflags |= XFS_TRANS_PERM_LOG_RES;
resp->tr_attrinval.tr_logres = xfs_calc_attrinval_reservation(mp);
resp->tr_attrinval.tr_logcount = XFS_ATTRINVAL_LOG_COUNT;
resp->tr_attrinval.tr_logflags |= XFS_TRANS_PERM_LOG_RES;
resp->tr_attrsetm.tr_logres = xfs_calc_attrsetm_reservation(mp);
resp->tr_attrsetm.tr_logcount = XFS_ATTRSET_LOG_COUNT;
resp->tr_attrsetm.tr_logflags |= XFS_TRANS_PERM_LOG_RES;
resp->tr_attrrm.tr_logres = xfs_calc_attrrm_reservation(mp);
resp->tr_attrrm.tr_logcount = XFS_ATTRRM_LOG_COUNT;
resp->tr_attrrm.tr_logflags |= XFS_TRANS_PERM_LOG_RES;
resp->tr_growrtalloc.tr_logres = xfs_calc_growrtalloc_reservation(mp);
resp->tr_growrtalloc.tr_logcount = XFS_DEFAULT_PERM_LOG_COUNT;
resp->tr_growrtalloc.tr_logflags |= XFS_TRANS_PERM_LOG_RES;
resp->tr_qm_dqalloc.tr_logres = xfs_calc_qm_dqalloc_reservation(mp,
false);
resp->tr_qm_dqalloc.tr_logcount = XFS_WRITE_LOG_COUNT;
resp->tr_qm_dqalloc.tr_logflags |= XFS_TRANS_PERM_LOG_RES;
xfs_calc_namespace_reservations(mp, resp);
/*
* The following transactions are logged in logical format with
* a default log count.
*/
resp->tr_qm_setqlim.tr_logres = xfs_calc_qm_setqlim_reservation();
resp->tr_qm_setqlim.tr_logcount = XFS_DEFAULT_LOG_COUNT;
resp->tr_sb.tr_logres = xfs_calc_sb_reservation(mp);
resp->tr_sb.tr_logcount = XFS_DEFAULT_LOG_COUNT;
/* growdata requires permanent res; it can free space to the last AG */
resp->tr_growdata.tr_logres = xfs_calc_growdata_reservation(mp);
resp->tr_growdata.tr_logcount = XFS_DEFAULT_PERM_LOG_COUNT;
resp->tr_growdata.tr_logflags |= XFS_TRANS_PERM_LOG_RES;
/* The following transaction are logged in logical format */
resp->tr_ichange.tr_logres = xfs_calc_ichange_reservation(mp);
resp->tr_fsyncts.tr_logres = xfs_calc_swrite_reservation(mp);
resp->tr_writeid.tr_logres = xfs_calc_writeid_reservation(mp);
resp->tr_attrsetrt.tr_logres = xfs_calc_attrsetrt_reservation(mp);
resp->tr_clearagi.tr_logres = xfs_calc_clear_agi_bucket_reservation(mp);
resp->tr_growrtzero.tr_logres = xfs_calc_growrtzero_reservation(mp);
resp->tr_growrtfree.tr_logres = xfs_calc_growrtfree_reservation(mp);
/*
* Add one logcount for BUI items that appear with rmap or reflink,
* one logcount for refcount intent items, and one logcount for rmap
* intent items.
*/
if (xfs_has_reflink(mp) || xfs_has_rmapbt(mp))
logcount_adj++;
if (xfs_has_reflink(mp))
logcount_adj++;
if (xfs_has_rmapbt(mp))
logcount_adj++;
resp->tr_itruncate.tr_logcount += logcount_adj;
resp->tr_write.tr_logcount += logcount_adj;
resp->tr_qm_dqalloc.tr_logcount += logcount_adj;
/*
* Now that we've finished computing the static reservations, we can
* compute the dynamic reservation for atomic writes.
*/
xfs_calc_default_atomic_ioend_reservation(mp, resp);
}
/*
* Return the per-extent and fixed transaction reservation sizes needed to
* complete an atomic write.
*/
STATIC unsigned int
xfs_calc_atomic_write_ioend_geometry(
struct xfs_mount *mp,
unsigned int *step_size)
{
const unsigned int efi = xfs_efi_log_space(1);
const unsigned int efd = xfs_efd_log_space(1);
const unsigned int rui = xfs_rui_log_space(1);
const unsigned int rud = xfs_rud_log_space();
const unsigned int cui = xfs_cui_log_space(1);
const unsigned int cud = xfs_cud_log_space();
const unsigned int bui = xfs_bui_log_space(1);
const unsigned int bud = xfs_bud_log_space();
/*
* Maximum overhead to complete an atomic write ioend in software:
* remove data fork extent + remove cow fork extent + map extent into
* data fork.
*
* tx0: Creates a BUI and a CUI and that's all it needs.
*
* tx1: Roll to finish the BUI. Need space for the BUD, an RUI, and
* enough space to relog the CUI (== CUI + CUD).
*
* tx2: Roll again to finish the RUI. Need space for the RUD and space
* to relog the CUI.
*
* tx3: Roll again, need space for the CUD and possibly a new EFI.
*
* tx4: Roll again, need space for an EFD.
*
* If the extent referenced by the pair of BUI/CUI items is not the one
* being currently processed, then we need to reserve space to relog
* both items.
*/
const unsigned int tx0 = bui + cui;
const unsigned int tx1 = bud + rui + cui + cud;
const unsigned int tx2 = rud + cui + cud;
const unsigned int tx3 = cud + efi;
const unsigned int tx4 = efd;
const unsigned int relog = bui + bud + cui + cud;
const unsigned int per_intent = max(max3(tx0, tx1, tx2),
max3(tx3, tx4, relog));
/* Overhead to finish one step of each intent item type */
const unsigned int f1 = xfs_calc_finish_efi_reservation(mp, 1);
const unsigned int f2 = xfs_calc_finish_rui_reservation(mp, 1);
const unsigned int f3 = xfs_calc_finish_cui_reservation(mp, 1);
const unsigned int f4 = xfs_calc_finish_bui_reservation(mp, 1);
/* We only finish one item per transaction in a chain */
*step_size = max(f4, max3(f1, f2, f3));
return per_intent;
}
/*
* Compute the maximum size (in fsblocks) of atomic writes that we can complete
* given the existing log reservations.
*/
xfs_extlen_t
xfs_calc_max_atomic_write_fsblocks(
struct xfs_mount *mp)
{
const struct xfs_trans_res *resv = &M_RES(mp)->tr_atomic_ioend;
unsigned int per_intent = 0;
unsigned int step_size = 0;
unsigned int ret = 0;
if (resv->tr_logres > 0) {
per_intent = xfs_calc_atomic_write_ioend_geometry(mp,
&step_size);
if (resv->tr_logres >= step_size)
ret = (resv->tr_logres - step_size) / per_intent;
}
trace_xfs_calc_max_atomic_write_fsblocks(mp, per_intent, step_size,
resv->tr_logres, ret);
return ret;
}
/*
* Compute the log blocks and transaction reservation needed to complete an
* atomic write of a given number of blocks. Worst case, each block requires
* separate handling. A return value of 0 means something went wrong.
*/
xfs_extlen_t
xfs_calc_atomic_write_log_geometry(
struct xfs_mount *mp,
xfs_extlen_t blockcount,
unsigned int *new_logres)
{
struct xfs_trans_res *curr_res = &M_RES(mp)->tr_atomic_ioend;
uint old_logres = curr_res->tr_logres;
unsigned int per_intent, step_size;
unsigned int logres;
xfs_extlen_t min_logblocks;
ASSERT(blockcount > 0);
xfs_calc_default_atomic_ioend_reservation(mp, M_RES(mp));
per_intent = xfs_calc_atomic_write_ioend_geometry(mp, &step_size);
/* Check for overflows */
if (check_mul_overflow(blockcount, per_intent, &logres) ||
check_add_overflow(logres, step_size, &logres))
return 0;
curr_res->tr_logres = logres;
min_logblocks = xfs_log_calc_minimum_size(mp);
curr_res->tr_logres = old_logres;
trace_xfs_calc_max_atomic_write_log_geometry(mp, per_intent, step_size,
blockcount, min_logblocks, logres);
*new_logres = logres;
return min_logblocks;
}
/*
* Compute the transaction reservation needed to complete an out of place
* atomic write of a given number of blocks.
*/
int
xfs_calc_atomic_write_reservation(
struct xfs_mount *mp,
xfs_extlen_t blockcount)
{
unsigned int new_logres;
xfs_extlen_t min_logblocks;
/*
* If the caller doesn't ask for a specific atomic write size, then
* use the defaults.
*/
if (blockcount == 0) {
xfs_calc_default_atomic_ioend_reservation(mp, M_RES(mp));
return 0;
}
min_logblocks = xfs_calc_atomic_write_log_geometry(mp, blockcount,
&new_logres);
if (!min_logblocks || min_logblocks > mp->m_sb.sb_logblocks)
return -EINVAL;
M_RES(mp)->tr_atomic_ioend.tr_logres = new_logres;
return 0;
}
