// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2016 Oracle. All Rights Reserved.
* Author: Darrick J. Wong <[email protected]>
*/
#include "xfs.h"
#include "xfs_fs.h"
#include "xfs_format.h"
#include "xfs_log_format.h"
#include "xfs_trans_resv.h"
#include "xfs_bit.h"
#include "xfs_shared.h"
#include "xfs_mount.h"
#include "xfs_defer.h"
#include "xfs_inode.h"
#include "xfs_trans.h"
#include "xfs_trans_priv.h"
#include "xfs_bmap_item.h"
#include "xfs_log.h"
#include "xfs_bmap.h"
#include "xfs_icache.h"
#include "xfs_bmap_btree.h"
#include "xfs_trans_space.h"
#include "xfs_error.h"
#include "xfs_log_priv.h"
#include "xfs_log_recover.h"
#include "xfs_ag.h"
#include "xfs_trace.h"
struct kmem_cache *xfs_bui_cache;
struct kmem_cache *xfs_bud_cache;
static const struct xfs_item_ops xfs_bui_item_ops;
static inline struct xfs_bui_log_item *BUI_ITEM(struct xfs_log_item *lip)
{
return container_of(lip, struct xfs_bui_log_item, bui_item);
}
STATIC void
xfs_bui_item_free(
struct xfs_bui_log_item *buip)
{
kvfree(buip->bui_item.li_lv_shadow);
kmem_cache_free(xfs_bui_cache, buip);
}
/*
* Freeing the BUI requires that we remove it from the AIL if it has already
* been placed there. However, the BUI may not yet have been placed in the AIL
* when called by xfs_bui_release() from BUD processing due to the ordering of
* committed vs unpin operations in bulk insert operations. Hence the reference
* count to ensure only the last caller frees the BUI.
*/
STATIC void
xfs_bui_release(
struct xfs_bui_log_item *buip)
{
ASSERT(atomic_read(&buip->bui_refcount) > 0);
if (!atomic_dec_and_test(&buip->bui_refcount))
return;
xfs_trans_ail_delete(&buip->bui_item, 0);
xfs_bui_item_free(buip);
}
STATIC void
xfs_bui_item_size(
struct xfs_log_item *lip,
int *nvecs,
int *nbytes)
{
struct xfs_bui_log_item *buip = BUI_ITEM(lip);
*nvecs += 1;
*nbytes += xfs_bui_log_format_sizeof(buip->bui_format.bui_nextents);
}
/*
* This is called to fill in the vector of log iovecs for the
* given bui log item. We use only 1 iovec, and we point that
* at the bui_log_format structure embedded in the bui item.
* It is at this point that we assert that all of the extent
* slots in the bui item have been filled.
*/
STATIC void
xfs_bui_item_format(
struct xfs_log_item *lip,
struct xfs_log_vec *lv)
{
struct xfs_bui_log_item *buip = BUI_ITEM(lip);
struct xfs_log_iovec *vecp = NULL;
ASSERT(atomic_read(&buip->bui_next_extent) ==
buip->bui_format.bui_nextents);
buip->bui_format.bui_type = XFS_LI_BUI;
buip->bui_format.bui_size = 1;
xlog_copy_iovec(lv, &vecp, XLOG_REG_TYPE_BUI_FORMAT, &buip->bui_format,
xfs_bui_log_format_sizeof(buip->bui_format.bui_nextents));
}
/*
* The unpin operation is the last place an BUI is manipulated in the log. It is
* either inserted in the AIL or aborted in the event of a log I/O error. In
* either case, the BUI transaction has been successfully committed to make it
* this far. Therefore, we expect whoever committed the BUI to either construct
* and commit the BUD or drop the BUD's reference in the event of error. Simply
* drop the log's BUI reference now that the log is done with it.
*/
STATIC void
xfs_bui_item_unpin(
struct xfs_log_item *lip,
int remove)
{
struct xfs_bui_log_item *buip = BUI_ITEM(lip);
xfs_bui_release(buip);
}
/*
* The BUI has been either committed or aborted if the transaction has been
* cancelled. If the transaction was cancelled, an BUD isn't going to be
* constructed and thus we free the BUI here directly.
*/
STATIC void
xfs_bui_item_release(
struct xfs_log_item *lip)
{
xfs_bui_release(BUI_ITEM(lip));
}
/*
* Allocate and initialize an bui item with the given number of extents.
*/
STATIC struct xfs_bui_log_item *
xfs_bui_init(
struct xfs_mount *mp)
{
struct xfs_bui_log_item *buip;
buip = kmem_cache_zalloc(xfs_bui_cache, GFP_KERNEL | __GFP_NOFAIL);
xfs_log_item_init(mp, &buip->bui_item, XFS_LI_BUI, &xfs_bui_item_ops);
buip->bui_format.bui_nextents = XFS_BUI_MAX_FAST_EXTENTS;
buip->bui_format.bui_id = (uintptr_t)(void *)buip;
atomic_set(&buip->bui_next_extent, 0);
atomic_set(&buip->bui_refcount, 2);
return buip;
}
static inline struct xfs_bud_log_item *BUD_ITEM(struct xfs_log_item *lip)
{
return container_of(lip, struct xfs_bud_log_item, bud_item);
}
STATIC void
xfs_bud_item_size(
struct xfs_log_item *lip,
int *nvecs,
int *nbytes)
{
*nvecs += 1;
*nbytes += sizeof(struct xfs_bud_log_format);
}
/*
* This is called to fill in the vector of log iovecs for the
* given bud log item. We use only 1 iovec, and we point that
* at the bud_log_format structure embedded in the bud item.
* It is at this point that we assert that all of the extent
* slots in the bud item have been filled.
*/
STATIC void
xfs_bud_item_format(
struct xfs_log_item *lip,
struct xfs_log_vec *lv)
{
struct xfs_bud_log_item *budp = BUD_ITEM(lip);
struct xfs_log_iovec *vecp = NULL;
budp->bud_format.bud_type = XFS_LI_BUD;
budp->bud_format.bud_size = 1;
xlog_copy_iovec(lv, &vecp, XLOG_REG_TYPE_BUD_FORMAT, &budp->bud_format,
sizeof(struct xfs_bud_log_format));
}
/*
* The BUD is either committed or aborted if the transaction is cancelled. If
* the transaction is cancelled, drop our reference to the BUI and free the
* BUD.
*/
STATIC void
xfs_bud_item_release(
struct xfs_log_item *lip)
{
struct xfs_bud_log_item *budp = BUD_ITEM(lip);
xfs_bui_release(budp->bud_buip);
kvfree(budp->bud_item.li_lv_shadow);
kmem_cache_free(xfs_bud_cache, budp);
}
static struct xfs_log_item *
xfs_bud_item_intent(
struct xfs_log_item *lip)
{
return &BUD_ITEM(lip)->bud_buip->bui_item;
}
static const struct xfs_item_ops xfs_bud_item_ops = {
.flags = XFS_ITEM_RELEASE_WHEN_COMMITTED |
XFS_ITEM_INTENT_DONE,
.iop_size = xfs_bud_item_size,
.iop_format = xfs_bud_item_format,
.iop_release = xfs_bud_item_release,
.iop_intent = xfs_bud_item_intent,
};
static inline struct xfs_bmap_intent *bi_entry(const struct list_head *e)
{
return list_entry(e, struct xfs_bmap_intent, bi_list);
}
/* Sort bmap intents by inode. */
static int
xfs_bmap_update_diff_items(
void *priv,
const struct list_head *a,
const struct list_head *b)
{
struct xfs_bmap_intent *ba = bi_entry(a);
struct xfs_bmap_intent *bb = bi_entry(b);
return ba->bi_owner->i_ino - bb->bi_owner->i_ino;
}
/* Log bmap updates in the intent item. */
STATIC void
xfs_bmap_update_log_item(
struct xfs_trans *tp,
struct xfs_bui_log_item *buip,
struct xfs_bmap_intent *bi)
{
uint next_extent;
struct xfs_map_extent *map;
/*
* atomic_inc_return gives us the value after the increment;
* we want to use it as an array index so we need to subtract 1 from
* it.
*/
next_extent = atomic_inc_return(&buip->bui_next_extent) - 1;
ASSERT(next_extent < buip->bui_format.bui_nextents);
map = &buip->bui_format.bui_extents[next_extent];
map->me_owner = bi->bi_owner->i_ino;
map->me_startblock = bi->bi_bmap.br_startblock;
map->me_startoff = bi->bi_bmap.br_startoff;
map->me_len = bi->bi_bmap.br_blockcount;
switch (bi->bi_type) {
case XFS_BMAP_MAP:
case XFS_BMAP_UNMAP:
map->me_flags = bi->bi_type;
break;
default:
ASSERT(0);
}
if (bi->bi_bmap.br_state == XFS_EXT_UNWRITTEN)
map->me_flags |= XFS_BMAP_EXTENT_UNWRITTEN;
if (bi->bi_whichfork == XFS_ATTR_FORK)
map->me_flags |= XFS_BMAP_EXTENT_ATTR_FORK;
if (xfs_ifork_is_realtime(bi->bi_owner, bi->bi_whichfork))
map->me_flags |= XFS_BMAP_EXTENT_REALTIME;
}
static struct xfs_log_item *
xfs_bmap_update_create_intent(
struct xfs_trans *tp,
struct list_head *items,
unsigned int count,
bool sort)
{
struct xfs_mount *mp = tp->t_mountp;
struct xfs_bui_log_item *buip = xfs_bui_init(mp);
struct xfs_bmap_intent *bi;
ASSERT(count == XFS_BUI_MAX_FAST_EXTENTS);
if (sort)
list_sort(mp, items, xfs_bmap_update_diff_items);
list_for_each_entry(bi, items, bi_list)
xfs_bmap_update_log_item(tp, buip, bi);
return &buip->bui_item;
}
/* Get an BUD so we can process all the deferred bmap updates. */
static struct xfs_log_item *
xfs_bmap_update_create_done(
struct xfs_trans *tp,
struct xfs_log_item *intent,
unsigned int count)
{
struct xfs_bui_log_item *buip = BUI_ITEM(intent);
struct xfs_bud_log_item *budp;
budp = kmem_cache_zalloc(xfs_bud_cache, GFP_KERNEL | __GFP_NOFAIL);
xfs_log_item_init(tp->t_mountp, &budp->bud_item, XFS_LI_BUD,
&xfs_bud_item_ops);
budp->bud_buip = buip;
budp->bud_format.bud_bui_id = buip->bui_format.bui_id;
return &budp->bud_item;
}
/* Take a passive ref to the AG containing the space we're mapping. */
static inline void
xfs_bmap_update_get_group(
struct xfs_mount *mp,
struct xfs_bmap_intent *bi)
{
if (xfs_ifork_is_realtime(bi->bi_owner, bi->bi_whichfork))
return;
/*
* Bump the intent count on behalf of the deferred rmap and refcount
* intent items that that we can queue when we finish this bmap work.
* This new intent item will bump the intent count before the bmap
* intent drops the intent count, ensuring that the intent count
* remains nonzero across the transaction roll.
*/
bi->bi_pag = xfs_perag_intent_get(mp, bi->bi_bmap.br_startblock);
}
/* Add this deferred BUI to the transaction. */
void
xfs_bmap_defer_add(
struct xfs_trans *tp,
struct xfs_bmap_intent *bi)
{
trace_xfs_bmap_defer(bi);
xfs_bmap_update_get_group(tp->t_mountp, bi);
/*
* Ensure the deferred mapping is pre-recorded in i_delayed_blks.
*
* Otherwise stat can report zero blocks for an inode that actually has
* data when the entire mapping is in the process of being overwritten
* using the out of place write path. This is undone in xfs_bmapi_remap
* after it has incremented di_nblocks for a successful operation.
*/
if (bi->bi_type == XFS_BMAP_MAP)
bi->bi_owner->i_delayed_blks += bi->bi_bmap.br_blockcount;
xfs_defer_add(tp, &bi->bi_list, &xfs_bmap_update_defer_type);
}
/* Release a passive AG ref after finishing mapping work. */
static inline void
xfs_bmap_update_put_group(
struct xfs_bmap_intent *bi)
{
if (xfs_ifork_is_realtime(bi->bi_owner, bi->bi_whichfork))
return;
xfs_perag_intent_put(bi->bi_pag);
}
/* Cancel a deferred bmap update. */
STATIC void
xfs_bmap_update_cancel_item(
struct list_head *item)
{
struct xfs_bmap_intent *bi = bi_entry(item);
if (bi->bi_type == XFS_BMAP_MAP)
bi->bi_owner->i_delayed_blks -= bi->bi_bmap.br_blockcount;
xfs_bmap_update_put_group(bi);
kmem_cache_free(xfs_bmap_intent_cache, bi);
}
/* Process a deferred bmap update. */
STATIC int
xfs_bmap_update_finish_item(
struct xfs_trans *tp,
struct xfs_log_item *done,
struct list_head *item,
struct xfs_btree_cur **state)
{
struct xfs_bmap_intent *bi = bi_entry(item);
int error;
error = xfs_bmap_finish_one(tp, bi);
if (!error && bi->bi_bmap.br_blockcount > 0) {
ASSERT(bi->bi_type == XFS_BMAP_UNMAP);
return -EAGAIN;
}
xfs_bmap_update_cancel_item(item);
return error;
}
/* Abort all pending BUIs. */
STATIC void
xfs_bmap_update_abort_intent(
struct xfs_log_item *intent)
{
xfs_bui_release(BUI_ITEM(intent));
}
/* Is this recovered BUI ok? */
static inline bool
xfs_bui_validate(
struct xfs_mount *mp,
struct xfs_bui_log_item *buip)
{
struct xfs_map_extent *map;
/* Only one mapping operation per BUI... */
if (buip->bui_format.bui_nextents != XFS_BUI_MAX_FAST_EXTENTS)
return false;
map = &buip->bui_format.bui_extents[0];
if (map->me_flags & ~XFS_BMAP_EXTENT_FLAGS)
return false;
switch (map->me_flags & XFS_BMAP_EXTENT_TYPE_MASK) {
case XFS_BMAP_MAP:
case XFS_BMAP_UNMAP:
break;
default:
return false;
}
if (!xfs_verify_ino(mp, map->me_owner))
return false;
if (!xfs_verify_fileext(mp, map->me_startoff, map->me_len))
return false;
if (map->me_flags & XFS_BMAP_EXTENT_REALTIME)
return xfs_verify_rtbext(mp, map->me_startblock, map->me_len);
return xfs_verify_fsbext(mp, map->me_startblock, map->me_len);
}
static inline struct xfs_bmap_intent *
xfs_bui_recover_work(
struct xfs_mount *mp,
struct xfs_defer_pending *dfp,
struct xfs_inode **ipp,
struct xfs_map_extent *map)
{
struct xfs_bmap_intent *bi;
int error;
error = xlog_recover_iget(mp, map->me_owner, ipp);
if (error)
return ERR_PTR(error);
bi = kmem_cache_zalloc(xfs_bmap_intent_cache,
GFP_KERNEL | __GFP_NOFAIL);
bi->bi_whichfork = (map->me_flags & XFS_BMAP_EXTENT_ATTR_FORK) ?
XFS_ATTR_FORK : XFS_DATA_FORK;
bi->bi_type = map->me_flags & XFS_BMAP_EXTENT_TYPE_MASK;
bi->bi_bmap.br_startblock = map->me_startblock;
bi->bi_bmap.br_startoff = map->me_startoff;
bi->bi_bmap.br_blockcount = map->me_len;
bi->bi_bmap.br_state = (map->me_flags & XFS_BMAP_EXTENT_UNWRITTEN) ?
XFS_EXT_UNWRITTEN : XFS_EXT_NORM;
bi->bi_owner = *ipp;
xfs_bmap_update_get_group(mp, bi);
/* see xfs_bmap_defer_add for details */
if (bi->bi_type == XFS_BMAP_MAP)
bi->bi_owner->i_delayed_blks += bi->bi_bmap.br_blockcount;
xfs_defer_add_item(dfp, &bi->bi_list);
return bi;
}
/*
* Process a bmap update intent item that was recovered from the log.
* We need to update some inode's bmbt.
*/
STATIC int
xfs_bmap_recover_work(
struct xfs_defer_pending *dfp,
struct list_head *capture_list)
{
struct xfs_trans_res resv;
struct xfs_log_item *lip = dfp->dfp_intent;
struct xfs_bui_log_item *buip = BUI_ITEM(lip);
struct xfs_trans *tp;
struct xfs_inode *ip = NULL;
struct xfs_mount *mp = lip->li_log->l_mp;
struct xfs_map_extent *map;
struct xfs_bmap_intent *work;
int iext_delta;
int error = 0;
if (!xfs_bui_validate(mp, buip)) {
XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp,
&buip->bui_format, sizeof(buip->bui_format));
return -EFSCORRUPTED;
}
map = &buip->bui_format.bui_extents[0];
work = xfs_bui_recover_work(mp, dfp, &ip, map);
if (IS_ERR(work))
return PTR_ERR(work);
/* Allocate transaction and do the work. */
resv = xlog_recover_resv(&M_RES(mp)->tr_itruncate);
error = xfs_trans_alloc(mp, &resv,
XFS_EXTENTADD_SPACE_RES(mp, XFS_DATA_FORK), 0, 0, &tp);
if (error)
goto err_rele;
xfs_ilock(ip, XFS_ILOCK_EXCL);
xfs_trans_ijoin(tp, ip, 0);
if (!!(map->me_flags & XFS_BMAP_EXTENT_REALTIME) !=
xfs_ifork_is_realtime(ip, work->bi_whichfork)) {
error = -EFSCORRUPTED;
goto err_cancel;
}
if (work->bi_type == XFS_BMAP_MAP)
iext_delta = XFS_IEXT_ADD_NOSPLIT_CNT;
else
iext_delta = XFS_IEXT_PUNCH_HOLE_CNT;
error = xfs_iext_count_extend(tp, ip, work->bi_whichfork, iext_delta);
if (error)
goto err_cancel;
error = xlog_recover_finish_intent(tp, dfp);
if (error == -EFSCORRUPTED)
XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp,
&buip->bui_format, sizeof(buip->bui_format));
if (error)
goto err_cancel;
/*
* Commit transaction, which frees the transaction and saves the inode
* for later replay activities.
*/
error = xfs_defer_ops_capture_and_commit(tp, capture_list);
if (error)
goto err_unlock;
xfs_iunlock(ip, XFS_ILOCK_EXCL);
xfs_irele(ip);
return 0;
err_cancel:
xfs_trans_cancel(tp);
err_unlock:
xfs_iunlock(ip, XFS_ILOCK_EXCL);
err_rele:
xfs_irele(ip);
return error;
}
/* Relog an intent item to push the log tail forward. */
static struct xfs_log_item *
xfs_bmap_relog_intent(
struct xfs_trans *tp,
struct xfs_log_item *intent,
struct xfs_log_item *done_item)
{
struct xfs_bui_log_item *buip;
struct xfs_map_extent *map;
unsigned int count;
count = BUI_ITEM(intent)->bui_format.bui_nextents;
map = BUI_ITEM(intent)->bui_format.bui_extents;
buip = xfs_bui_init(tp->t_mountp);
memcpy(buip->bui_format.bui_extents, map, count * sizeof(*map));
atomic_set(&buip->bui_next_extent, count);
return &buip->bui_item;
}
const struct xfs_defer_op_type xfs_bmap_update_defer_type = {
.name = "bmap",
.max_items = XFS_BUI_MAX_FAST_EXTENTS,
.create_intent = xfs_bmap_update_create_intent,
.abort_intent = xfs_bmap_update_abort_intent,
.create_done = xfs_bmap_update_create_done,
.finish_item = xfs_bmap_update_finish_item,
.cancel_item = xfs_bmap_update_cancel_item,
.recover_work = xfs_bmap_recover_work,
.relog_intent = xfs_bmap_relog_intent,
};
STATIC bool
xfs_bui_item_match(
struct xfs_log_item *lip,
uint64_t intent_id)
{
return BUI_ITEM(lip)->bui_format.bui_id == intent_id;
}
static const struct xfs_item_ops xfs_bui_item_ops = {
.flags = XFS_ITEM_INTENT,
.iop_size = xfs_bui_item_size,
.iop_format = xfs_bui_item_format,
.iop_unpin = xfs_bui_item_unpin,
.iop_release = xfs_bui_item_release,
.iop_match = xfs_bui_item_match,
};
static inline void
xfs_bui_copy_format(
struct xfs_bui_log_format *dst,
const struct xfs_bui_log_format *src)
{
unsigned int i;
memcpy(dst, src, offsetof(struct xfs_bui_log_format, bui_extents));
for (i = 0; i < src->bui_nextents; i++)
memcpy(&dst->bui_extents[i], &src->bui_extents[i],
sizeof(struct xfs_map_extent));
}
/*
* This routine is called to create an in-core extent bmap update
* item from the bui format structure which was logged on disk.
* It allocates an in-core bui, copies the extents from the format
* structure into it, and adds the bui to the AIL with the given
* LSN.
*/
STATIC int
xlog_recover_bui_commit_pass2(
struct xlog *log,
struct list_head *buffer_list,
struct xlog_recover_item *item,
xfs_lsn_t lsn)
{
struct xfs_mount *mp = log->l_mp;
struct xfs_bui_log_item *buip;
struct xfs_bui_log_format *bui_formatp;
size_t len;
bui_formatp = item->ri_buf[0].i_addr;
if (item->ri_buf[0].i_len < xfs_bui_log_format_sizeof(0)) {
XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp,
item->ri_buf[0].i_addr, item->ri_buf[0].i_len);
return -EFSCORRUPTED;
}
if (bui_formatp->bui_nextents != XFS_BUI_MAX_FAST_EXTENTS) {
XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp,
item->ri_buf[0].i_addr, item->ri_buf[0].i_len);
return -EFSCORRUPTED;
}
len = xfs_bui_log_format_sizeof(bui_formatp->bui_nextents);
if (item->ri_buf[0].i_len != len) {
XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp,
item->ri_buf[0].i_addr, item->ri_buf[0].i_len);
return -EFSCORRUPTED;
}
buip = xfs_bui_init(mp);
xfs_bui_copy_format(&buip->bui_format, bui_formatp);
atomic_set(&buip->bui_next_extent, bui_formatp->bui_nextents);
xlog_recover_intent_item(log, &buip->bui_item, lsn,
&xfs_bmap_update_defer_type);
return 0;
}
const struct xlog_recover_item_ops xlog_bui_item_ops = {
.item_type = XFS_LI_BUI,
.commit_pass2 = xlog_recover_bui_commit_pass2,
};
/*
* This routine is called when an BUD format structure is found in a committed
* transaction in the log. Its purpose is to cancel the corresponding BUI if it
* was still in the log. To do this it searches the AIL for the BUI with an id
* equal to that in the BUD format structure. If we find it we drop the BUD
* reference, which removes the BUI from the AIL and frees it.
*/
STATIC int
xlog_recover_bud_commit_pass2(
struct xlog *log,
struct list_head *buffer_list,
struct xlog_recover_item *item,
xfs_lsn_t lsn)
{
struct xfs_bud_log_format *bud_formatp;
bud_formatp = item->ri_buf[0].i_addr;
if (item->ri_buf[0].i_len != sizeof(struct xfs_bud_log_format)) {
XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, log->l_mp,
item->ri_buf[0].i_addr, item->ri_buf[0].i_len);
return -EFSCORRUPTED;
}
xlog_recover_release_intent(log, XFS_LI_BUI, bud_formatp->bud_bui_id);
return 0;
}
const struct xlog_recover_item_ops xlog_bud_item_ops = {
.item_type = XFS_LI_BUD,
.commit_pass2 = xlog_recover_bud_commit_pass2,
};
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