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kernel / pub / scm / fs / xfs / xfsprogs-dev / 451b902f95add9e87681ad27ce5693c4b7efb182 / . / libxfs / xfs_bmap.c
blob: e788e33e5df9c3de2843ae2d63c6591f5ee0dcc2 [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2000-2006 Silicon Graphics, Inc.
* All Rights Reserved.
*/
#include "libxfs_priv.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_sb.h"
#include "xfs_mount.h"
#include "xfs_defer.h"
#include "xfs_dir2.h"
#include "xfs_inode.h"
#include "xfs_btree.h"
#include "xfs_trans.h"
#include "xfs_alloc.h"
#include "xfs_bmap.h"
#include "xfs_bmap_btree.h"
#include "xfs_errortag.h"
#include "xfs_trans_space.h"
#include "xfs_trace.h"
#include "xfs_attr_leaf.h"
#include "xfs_quota_defs.h"
#include "xfs_rmap.h"
#include "xfs_ag.h"
#include "xfs_ag_resv.h"
#include "xfs_refcount.h"
struct kmem_cache *xfs_bmap_intent_cache;
/*
* Miscellaneous helper functions
*/
/*
* Compute and fill in the value of the maximum depth of a bmap btree
* in this filesystem. Done once, during mount.
*/
void
xfs_bmap_compute_maxlevels(
xfs_mount_t *mp, /* file system mount structure */
int whichfork) /* data or attr fork */
{
uint64_t maxblocks; /* max blocks at this level */
xfs_extnum_t maxleafents; /* max leaf entries possible */
int level; /* btree level */
int maxrootrecs; /* max records in root block */
int minleafrecs; /* min records in leaf block */
int minnoderecs; /* min records in node block */
int sz; /* root block size */
/*
* The maximum number of extents in a fork, hence the maximum number of
* leaf entries, is controlled by the size of the on-disk extent count.
*
* Note that we can no longer assume that if we are in ATTR1 that the
* fork offset of all the inodes will be
* (xfs_default_attroffset(ip) >> 3) because we could have mounted with
* ATTR2 and then mounted back with ATTR1, keeping the i_forkoff's fixed
* but probably at various positions. Therefore, for both ATTR1 and
* ATTR2 we have to assume the worst case scenario of a minimum size
* available.
*/
maxleafents = xfs_iext_max_nextents(xfs_has_large_extent_counts(mp),
whichfork);
if (whichfork == XFS_DATA_FORK)
sz = XFS_BMDR_SPACE_CALC(MINDBTPTRS);
else
sz = XFS_BMDR_SPACE_CALC(MINABTPTRS);
maxrootrecs = xfs_bmdr_maxrecs(sz, 0);
minleafrecs = mp->m_bmap_dmnr[0];
minnoderecs = mp->m_bmap_dmnr[1];
maxblocks = howmany_64(maxleafents, minleafrecs);
for (level = 1; maxblocks > 1; level++) {
if (maxblocks <= maxrootrecs)
maxblocks = 1;
else
maxblocks = howmany_64(maxblocks, minnoderecs);
}
mp->m_bm_maxlevels[whichfork] = level;
ASSERT(mp->m_bm_maxlevels[whichfork] <= xfs_bmbt_maxlevels_ondisk());
}
unsigned int
xfs_bmap_compute_attr_offset(
struct xfs_mount *mp)
{
if (mp->m_sb.sb_inodesize == 256)
return XFS_LITINO(mp) - XFS_BMDR_SPACE_CALC(MINABTPTRS);
return XFS_BMDR_SPACE_CALC(6 * MINABTPTRS);
}
STATIC int /* error */
xfs_bmbt_lookup_eq(
struct xfs_btree_cur *cur,
struct xfs_bmbt_irec *irec,
int *stat) /* success/failure */
{
cur->bc_rec.b = *irec;
return xfs_btree_lookup(cur, XFS_LOOKUP_EQ, stat);
}
STATIC int /* error */
xfs_bmbt_lookup_first(
struct xfs_btree_cur *cur,
int *stat) /* success/failure */
{
cur->bc_rec.b.br_startoff = 0;
cur->bc_rec.b.br_startblock = 0;
cur->bc_rec.b.br_blockcount = 0;
return xfs_btree_lookup(cur, XFS_LOOKUP_GE, stat);
}
/*
* Check if the inode needs to be converted to btree format.
*/
static inline bool xfs_bmap_needs_btree(struct xfs_inode *ip, int whichfork)
{
struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork);
return whichfork != XFS_COW_FORK &&
ifp->if_format == XFS_DINODE_FMT_EXTENTS &&
ifp->if_nextents > XFS_IFORK_MAXEXT(ip, whichfork);
}
/*
* Check if the inode should be converted to extent format.
*/
static inline bool xfs_bmap_wants_extents(struct xfs_inode *ip, int whichfork)
{
struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork);
return whichfork != XFS_COW_FORK &&
ifp->if_format == XFS_DINODE_FMT_BTREE &&
ifp->if_nextents <= XFS_IFORK_MAXEXT(ip, whichfork);
}
/*
* Update the record referred to by cur to the value given by irec
* This either works (return 0) or gets an EFSCORRUPTED error.
*/
STATIC int
xfs_bmbt_update(
struct xfs_btree_cur *cur,
struct xfs_bmbt_irec *irec)
{
union xfs_btree_rec rec;
xfs_bmbt_disk_set_all(&rec.bmbt, irec);
return xfs_btree_update(cur, &rec);
}
/*
* Compute the worst-case number of indirect blocks that will be used
* for ip's delayed extent of length "len".
*/
STATIC xfs_filblks_t
xfs_bmap_worst_indlen(
xfs_inode_t *ip, /* incore inode pointer */
xfs_filblks_t len) /* delayed extent length */
{
int level; /* btree level number */
int maxrecs; /* maximum record count at this level */
xfs_mount_t *mp; /* mount structure */
xfs_filblks_t rval; /* return value */
mp = ip->i_mount;
maxrecs = mp->m_bmap_dmxr[0];
for (level = 0, rval = 0;
level < XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK);
level++) {
len += maxrecs - 1;
do_div(len, maxrecs);
rval += len;
if (len == 1)
return rval + XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK) -
level - 1;
if (level == 0)
maxrecs = mp->m_bmap_dmxr[1];
}
return rval;
}
/*
* Calculate the default attribute fork offset for newly created inodes.
*/
uint
xfs_default_attroffset(
struct xfs_inode *ip)
{
if (ip->i_df.if_format == XFS_DINODE_FMT_DEV)
return roundup(sizeof(xfs_dev_t), 8);
return M_IGEO(ip->i_mount)->attr_fork_offset;
}
/*
* Helper routine to reset inode i_forkoff field when switching attribute fork
* from local to extent format - we reset it where possible to make space
* available for inline data fork extents.
*/
STATIC void
xfs_bmap_forkoff_reset(
xfs_inode_t *ip,
int whichfork)
{
if (whichfork == XFS_ATTR_FORK &&
ip->i_df.if_format != XFS_DINODE_FMT_DEV &&
ip->i_df.if_format != XFS_DINODE_FMT_BTREE) {
uint dfl_forkoff = xfs_default_attroffset(ip) >> 3;
if (dfl_forkoff > ip->i_forkoff)
ip->i_forkoff = dfl_forkoff;
}
}
#ifdef DEBUG
STATIC struct xfs_buf *
xfs_bmap_get_bp(
struct xfs_btree_cur *cur,
xfs_fsblock_t bno)
{
struct xfs_log_item *lip;
int i;
if (!cur)
return NULL;
for (i = 0; i < cur->bc_maxlevels; i++) {
if (!cur->bc_levels[i].bp)
break;
if (xfs_buf_daddr(cur->bc_levels[i].bp) == bno)
return cur->bc_levels[i].bp;
}
/* Chase down all the log items to see if the bp is there */
list_for_each_entry(lip, &cur->bc_tp->t_items, li_trans) {
struct xfs_buf_log_item *bip = (struct xfs_buf_log_item *)lip;
if (bip->bli_item.li_type == XFS_LI_BUF &&
xfs_buf_daddr(bip->bli_buf) == bno)
return bip->bli_buf;
}
return NULL;
}
STATIC void
xfs_check_block(
struct xfs_btree_block *block,
xfs_mount_t *mp,
int root,
short sz)
{
int i, j, dmxr;
__be64 *pp, *thispa; /* pointer to block address */
xfs_bmbt_key_t *prevp, *keyp;
ASSERT(be16_to_cpu(block->bb_level) > 0);
prevp = NULL;
for( i = 1; i <= xfs_btree_get_numrecs(block); i++) {
dmxr = mp->m_bmap_dmxr[0];
keyp = XFS_BMBT_KEY_ADDR(mp, block, i);
if (prevp) {
ASSERT(be64_to_cpu(prevp->br_startoff) <
be64_to_cpu(keyp->br_startoff));
}
prevp = keyp;
/*
* Compare the block numbers to see if there are dups.
*/
if (root)
pp = XFS_BMAP_BROOT_PTR_ADDR(mp, block, i, sz);
else
pp = XFS_BMBT_PTR_ADDR(mp, block, i, dmxr);
for (j = i+1; j <= be16_to_cpu(block->bb_numrecs); j++) {
if (root)
thispa = XFS_BMAP_BROOT_PTR_ADDR(mp, block, j, sz);
else
thispa = XFS_BMBT_PTR_ADDR(mp, block, j, dmxr);
if (*thispa == *pp) {
xfs_warn(mp, "%s: thispa(%d) == pp(%d) %lld",
__func__, j, i,
(unsigned long long)be64_to_cpu(*thispa));
xfs_err(mp, "%s: ptrs are equal in node\n",
__func__);
xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
}
}
}
}
/*
* Check that the extents for the inode ip are in the right order in all
* btree leaves. THis becomes prohibitively expensive for large extent count
* files, so don't bother with inodes that have more than 10,000 extents in
* them. The btree record ordering checks will still be done, so for such large
* bmapbt constructs that is going to catch most corruptions.
*/
STATIC void
xfs_bmap_check_leaf_extents(
struct xfs_btree_cur *cur, /* btree cursor or null */
xfs_inode_t *ip, /* incore inode pointer */
int whichfork) /* data or attr fork */
{
struct xfs_mount *mp = ip->i_mount;
struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork);
struct xfs_btree_block *block; /* current btree block */
xfs_fsblock_t bno; /* block # of "block" */
struct xfs_buf *bp; /* buffer for "block" */
int error; /* error return value */
xfs_extnum_t i=0, j; /* index into the extents list */
int level; /* btree level, for checking */
__be64 *pp; /* pointer to block address */
xfs_bmbt_rec_t *ep; /* pointer to current extent */
xfs_bmbt_rec_t last = {0, 0}; /* last extent in prev block */
xfs_bmbt_rec_t *nextp; /* pointer to next extent */
int bp_release = 0;
if (ifp->if_format != XFS_DINODE_FMT_BTREE)
return;
/* skip large extent count inodes */
if (ip->i_df.if_nextents > 10000)
return;
bno = NULLFSBLOCK;
block = ifp->if_broot;
/*
* Root level must use BMAP_BROOT_PTR_ADDR macro to get ptr out.
*/
level = be16_to_cpu(block->bb_level);
ASSERT(level > 0);
xfs_check_block(block, mp, 1, ifp->if_broot_bytes);
pp = XFS_BMAP_BROOT_PTR_ADDR(mp, block, 1, ifp->if_broot_bytes);
bno = be64_to_cpu(*pp);
ASSERT(bno != NULLFSBLOCK);
ASSERT(XFS_FSB_TO_AGNO(mp, bno) < mp->m_sb.sb_agcount);
ASSERT(XFS_FSB_TO_AGBNO(mp, bno) < mp->m_sb.sb_agblocks);
/*
* Go down the tree until leaf level is reached, following the first
* pointer (leftmost) at each level.
*/
while (level-- > 0) {
/* See if buf is in cur first */
bp_release = 0;
bp = xfs_bmap_get_bp(cur, XFS_FSB_TO_DADDR(mp, bno));
if (!bp) {
bp_release = 1;
error = xfs_btree_read_bufl(mp, NULL, bno, &bp,
XFS_BMAP_BTREE_REF,
&xfs_bmbt_buf_ops);
if (error)
goto error_norelse;
}
block = XFS_BUF_TO_BLOCK(bp);
if (level == 0)
break;
/*
* Check this block for basic sanity (increasing keys and
* no duplicate blocks).
*/
xfs_check_block(block, mp, 0, 0);
pp = XFS_BMBT_PTR_ADDR(mp, block, 1, mp->m_bmap_dmxr[1]);
bno = be64_to_cpu(*pp);
if (XFS_IS_CORRUPT(mp, !xfs_verify_fsbno(mp, bno))) {
error = -EFSCORRUPTED;
goto error0;
}
if (bp_release) {
bp_release = 0;
xfs_trans_brelse(NULL, bp);
}
}
/*
* Here with bp and block set to the leftmost leaf node in the tree.
*/
i = 0;
/*
* Loop over all leaf nodes checking that all extents are in the right order.
*/
for (;;) {
xfs_fsblock_t nextbno;
xfs_extnum_t num_recs;
num_recs = xfs_btree_get_numrecs(block);
/*
* Read-ahead the next leaf block, if any.
*/
nextbno = be64_to_cpu(block->bb_u.l.bb_rightsib);
/*
* Check all the extents to make sure they are OK.
* If we had a previous block, the last entry should
* conform with the first entry in this one.
*/
ep = XFS_BMBT_REC_ADDR(mp, block, 1);
if (i) {
ASSERT(xfs_bmbt_disk_get_startoff(&last) +
xfs_bmbt_disk_get_blockcount(&last) <=
xfs_bmbt_disk_get_startoff(ep));
}
for (j = 1; j < num_recs; j++) {
nextp = XFS_BMBT_REC_ADDR(mp, block, j + 1);
ASSERT(xfs_bmbt_disk_get_startoff(ep) +
xfs_bmbt_disk_get_blockcount(ep) <=
xfs_bmbt_disk_get_startoff(nextp));
ep = nextp;
}
last = *ep;
i += num_recs;
if (bp_release) {
bp_release = 0;
xfs_trans_brelse(NULL, bp);
}
bno = nextbno;
/*
* If we've reached the end, stop.
*/
if (bno == NULLFSBLOCK)
break;
bp_release = 0;
bp = xfs_bmap_get_bp(cur, XFS_FSB_TO_DADDR(mp, bno));
if (!bp) {
bp_release = 1;
error = xfs_btree_read_bufl(mp, NULL, bno, &bp,
XFS_BMAP_BTREE_REF,
&xfs_bmbt_buf_ops);
if (error)
goto error_norelse;
}
block = XFS_BUF_TO_BLOCK(bp);
}
return;
error0:
xfs_warn(mp, "%s: at error0", __func__);
if (bp_release)
xfs_trans_brelse(NULL, bp);
error_norelse:
xfs_warn(mp, "%s: BAD after btree leaves for %llu extents",
__func__, i);
xfs_err(mp, "%s: CORRUPTED BTREE OR SOMETHING", __func__);
xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
return;
}
/*
* Validate that the bmbt_irecs being returned from bmapi are valid
* given the caller's original parameters. Specifically check the
* ranges of the returned irecs to ensure that they only extend beyond
* the given parameters if the XFS_BMAPI_ENTIRE flag was set.
*/
STATIC void
xfs_bmap_validate_ret(
xfs_fileoff_t bno,
xfs_filblks_t len,
uint32_t flags,
xfs_bmbt_irec_t *mval,
int nmap,
int ret_nmap)
{
int i; /* index to map values */
ASSERT(ret_nmap <= nmap);
for (i = 0; i < ret_nmap; i++) {
ASSERT(mval[i].br_blockcount > 0);
if (!(flags & XFS_BMAPI_ENTIRE)) {
ASSERT(mval[i].br_startoff >= bno);
ASSERT(mval[i].br_blockcount <= len);
ASSERT(mval[i].br_startoff + mval[i].br_blockcount <=
bno + len);
} else {
ASSERT(mval[i].br_startoff < bno + len);
ASSERT(mval[i].br_startoff + mval[i].br_blockcount >
bno);
}
ASSERT(i == 0 ||
mval[i - 1].br_startoff + mval[i - 1].br_blockcount ==
mval[i].br_startoff);
ASSERT(mval[i].br_startblock != DELAYSTARTBLOCK &&
mval[i].br_startblock != HOLESTARTBLOCK);
ASSERT(mval[i].br_state == XFS_EXT_NORM ||
mval[i].br_state == XFS_EXT_UNWRITTEN);
}
}
#else
#define xfs_bmap_check_leaf_extents(cur, ip, whichfork) do { } while (0)
#define xfs_bmap_validate_ret(bno,len,flags,mval,onmap,nmap) do { } while (0)
#endif /* DEBUG */
/*
* Inode fork format manipulation functions
*/
/*
* Convert the inode format to extent format if it currently is in btree format,
* but the extent list is small enough that it fits into the extent format.
*
* Since the extents are already in-core, all we have to do is give up the space
* for the btree root and pitch the leaf block.
*/
STATIC int /* error */
xfs_bmap_btree_to_extents(
struct xfs_trans *tp, /* transaction pointer */
struct xfs_inode *ip, /* incore inode pointer */
struct xfs_btree_cur *cur, /* btree cursor */
int *logflagsp, /* inode logging flags */
int whichfork) /* data or attr fork */
{
struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork);
struct xfs_mount *mp = ip->i_mount;
struct xfs_btree_block *rblock = ifp->if_broot;
struct xfs_btree_block *cblock;/* child btree block */
xfs_fsblock_t cbno; /* child block number */
struct xfs_buf *cbp; /* child block's buffer */
int error; /* error return value */
__be64 *pp; /* ptr to block address */
struct xfs_owner_info oinfo;
/* check if we actually need the extent format first: */
if (!xfs_bmap_wants_extents(ip, whichfork))
return 0;
ASSERT(cur);
ASSERT(whichfork != XFS_COW_FORK);
ASSERT(ifp->if_format == XFS_DINODE_FMT_BTREE);
ASSERT(be16_to_cpu(rblock->bb_level) == 1);
ASSERT(be16_to_cpu(rblock->bb_numrecs) == 1);
ASSERT(xfs_bmbt_maxrecs(mp, ifp->if_broot_bytes, 0) == 1);
pp = XFS_BMAP_BROOT_PTR_ADDR(mp, rblock, 1, ifp->if_broot_bytes);
cbno = be64_to_cpu(*pp);
#ifdef DEBUG
if (XFS_IS_CORRUPT(cur->bc_mp, !xfs_btree_check_lptr(cur, cbno, 1)))
return -EFSCORRUPTED;
#endif
error = xfs_btree_read_bufl(mp, tp, cbno, &cbp, XFS_BMAP_BTREE_REF,
&xfs_bmbt_buf_ops);
if (error)
return error;
cblock = XFS_BUF_TO_BLOCK(cbp);
if ((error = xfs_btree_check_block(cur, cblock, 0, cbp)))
return error;
xfs_rmap_ino_bmbt_owner(&oinfo, ip->i_ino, whichfork);
xfs_free_extent_later(cur->bc_tp, cbno, 1, &oinfo);
ip->i_nblocks--;
xfs_trans_mod_dquot_byino(tp, ip, XFS_TRANS_DQ_BCOUNT, -1L);
xfs_trans_binval(tp, cbp);
if (cur->bc_levels[0].bp == cbp)
cur->bc_levels[0].bp = NULL;
xfs_iroot_realloc(ip, -1, whichfork);
ASSERT(ifp->if_broot == NULL);
ifp->if_format = XFS_DINODE_FMT_EXTENTS;
*logflagsp |= XFS_ILOG_CORE | xfs_ilog_fext(whichfork);
return 0;
}
/*
* Convert an extents-format file into a btree-format file.
* The new file will have a root block (in the inode) and a single child block.
*/
STATIC int /* error */
xfs_bmap_extents_to_btree(
struct xfs_trans *tp, /* transaction pointer */
struct xfs_inode *ip, /* incore inode pointer */
struct xfs_btree_cur **curp, /* cursor returned to caller */
int wasdel, /* converting a delayed alloc */
int *logflagsp, /* inode logging flags */
int whichfork) /* data or attr fork */
{
struct xfs_btree_block *ablock; /* allocated (child) bt block */
struct xfs_buf *abp; /* buffer for ablock */
struct xfs_alloc_arg args; /* allocation arguments */
struct xfs_bmbt_rec *arp; /* child record pointer */
struct xfs_btree_block *block; /* btree root block */
struct xfs_btree_cur *cur; /* bmap btree cursor */
int error; /* error return value */
struct xfs_ifork *ifp; /* inode fork pointer */
struct xfs_bmbt_key *kp; /* root block key pointer */
struct xfs_mount *mp; /* mount structure */
xfs_bmbt_ptr_t *pp; /* root block address pointer */
struct xfs_iext_cursor icur;
struct xfs_bmbt_irec rec;
xfs_extnum_t cnt = 0;
mp = ip->i_mount;
ASSERT(whichfork != XFS_COW_FORK);
ifp = xfs_ifork_ptr(ip, whichfork);
ASSERT(ifp->if_format == XFS_DINODE_FMT_EXTENTS);
/*
* Make space in the inode incore. This needs to be undone if we fail
* to expand the root.
*/
xfs_iroot_realloc(ip, 1, whichfork);
/*
* Fill in the root.
*/
block = ifp->if_broot;
xfs_btree_init_block_int(mp, block, XFS_BUF_DADDR_NULL,
XFS_BTNUM_BMAP, 1, 1, ip->i_ino,
XFS_BTREE_LONG_PTRS);
/*
* Need a cursor. Can't allocate until bb_level is filled in.
*/
cur = xfs_bmbt_init_cursor(mp, tp, ip, whichfork);
cur->bc_ino.flags = wasdel ? XFS_BTCUR_BMBT_WASDEL : 0;
/*
* Convert to a btree with two levels, one record in root.
*/
ifp->if_format = XFS_DINODE_FMT_BTREE;
memset(&args, 0, sizeof(args));
args.tp = tp;
args.mp = mp;
xfs_rmap_ino_bmbt_owner(&args.oinfo, ip->i_ino, whichfork);
args.minlen = args.maxlen = args.prod = 1;
args.wasdel = wasdel;
*logflagsp = 0;
error = xfs_alloc_vextent_start_ag(&args,
XFS_INO_TO_FSB(mp, ip->i_ino));
if (error)
goto out_root_realloc;
/*
* Allocation can't fail, the space was reserved.
*/
if (WARN_ON_ONCE(args.fsbno == NULLFSBLOCK)) {
error = -ENOSPC;
goto out_root_realloc;
}
cur->bc_ino.allocated++;
ip->i_nblocks++;
xfs_trans_mod_dquot_byino(tp, ip, XFS_TRANS_DQ_BCOUNT, 1L);
error = xfs_trans_get_buf(tp, mp->m_ddev_targp,
XFS_FSB_TO_DADDR(mp, args.fsbno),
mp->m_bsize, 0, &abp);
if (error)
goto out_unreserve_dquot;
/*
* Fill in the child block.
*/
abp->b_ops = &xfs_bmbt_buf_ops;
ablock = XFS_BUF_TO_BLOCK(abp);
xfs_btree_init_block_int(mp, ablock, xfs_buf_daddr(abp),
XFS_BTNUM_BMAP, 0, 0, ip->i_ino,
XFS_BTREE_LONG_PTRS);
for_each_xfs_iext(ifp, &icur, &rec) {
if (isnullstartblock(rec.br_startblock))
continue;
arp = XFS_BMBT_REC_ADDR(mp, ablock, 1 + cnt);
xfs_bmbt_disk_set_all(arp, &rec);
cnt++;
}
ASSERT(cnt == ifp->if_nextents);
xfs_btree_set_numrecs(ablock, cnt);
/*
* Fill in the root key and pointer.
*/
kp = XFS_BMBT_KEY_ADDR(mp, block, 1);
arp = XFS_BMBT_REC_ADDR(mp, ablock, 1);
kp->br_startoff = cpu_to_be64(xfs_bmbt_disk_get_startoff(arp));
pp = XFS_BMBT_PTR_ADDR(mp, block, 1, xfs_bmbt_get_maxrecs(cur,
be16_to_cpu(block->bb_level)));
*pp = cpu_to_be64(args.fsbno);
/*
* Do all this logging at the end so that
* the root is at the right level.
*/
xfs_btree_log_block(cur, abp, XFS_BB_ALL_BITS);
xfs_btree_log_recs(cur, abp, 1, be16_to_cpu(ablock->bb_numrecs));
ASSERT(*curp == NULL);
*curp = cur;
*logflagsp = XFS_ILOG_CORE | xfs_ilog_fbroot(whichfork);
return 0;
out_unreserve_dquot:
xfs_trans_mod_dquot_byino(tp, ip, XFS_TRANS_DQ_BCOUNT, -1L);
out_root_realloc:
xfs_iroot_realloc(ip, -1, whichfork);
ifp->if_format = XFS_DINODE_FMT_EXTENTS;
ASSERT(ifp->if_broot == NULL);
xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
return error;
}
/*
* Convert a local file to an extents file.
* This code is out of bounds for data forks of regular files,
* since the file data needs to get logged so things will stay consistent.
* (The bmap-level manipulations are ok, though).
*/
void
xfs_bmap_local_to_extents_empty(
struct xfs_trans *tp,
struct xfs_inode *ip,
int whichfork)
{
struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork);
ASSERT(whichfork != XFS_COW_FORK);
ASSERT(ifp->if_format == XFS_DINODE_FMT_LOCAL);
ASSERT(ifp->if_bytes == 0);
ASSERT(ifp->if_nextents == 0);
xfs_bmap_forkoff_reset(ip, whichfork);
ifp->if_u1.if_root = NULL;
ifp->if_height = 0;
ifp->if_format = XFS_DINODE_FMT_EXTENTS;
xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
}
STATIC int /* error */
xfs_bmap_local_to_extents(
xfs_trans_t *tp, /* transaction pointer */
xfs_inode_t *ip, /* incore inode pointer */
xfs_extlen_t total, /* total blocks needed by transaction */
int *logflagsp, /* inode logging flags */
int whichfork,
void (*init_fn)(struct xfs_trans *tp,
struct xfs_buf *bp,
struct xfs_inode *ip,
struct xfs_ifork *ifp))
{
int error = 0;
int flags; /* logging flags returned */
struct xfs_ifork *ifp; /* inode fork pointer */
xfs_alloc_arg_t args; /* allocation arguments */
struct xfs_buf *bp; /* buffer for extent block */
struct xfs_bmbt_irec rec;
struct xfs_iext_cursor icur;
/*
* We don't want to deal with the case of keeping inode data inline yet.
* So sending the data fork of a regular inode is invalid.
*/
ASSERT(!(S_ISREG(VFS_I(ip)->i_mode) && whichfork == XFS_DATA_FORK));
ifp = xfs_ifork_ptr(ip, whichfork);
ASSERT(ifp->if_format == XFS_DINODE_FMT_LOCAL);
if (!ifp->if_bytes) {
xfs_bmap_local_to_extents_empty(tp, ip, whichfork);
flags = XFS_ILOG_CORE;
goto done;
}
flags = 0;
error = 0;
memset(&args, 0, sizeof(args));
args.tp = tp;
args.mp = ip->i_mount;
args.total = total;
args.minlen = args.maxlen = args.prod = 1;
xfs_rmap_ino_owner(&args.oinfo, ip->i_ino, whichfork, 0);
/*
* Allocate a block. We know we need only one, since the
* file currently fits in an inode.
*/
args.total = total;
args.minlen = args.maxlen = args.prod = 1;
error = xfs_alloc_vextent_start_ag(&args,
XFS_INO_TO_FSB(args.mp, ip->i_ino));
if (error)
goto done;
/* Can't fail, the space was reserved. */
ASSERT(args.fsbno != NULLFSBLOCK);
ASSERT(args.len == 1);
error = xfs_trans_get_buf(tp, args.mp->m_ddev_targp,
XFS_FSB_TO_DADDR(args.mp, args.fsbno),
args.mp->m_bsize, 0, &bp);
if (error)
goto done;
/*
* Initialize the block, copy the data and log the remote buffer.
*
* The callout is responsible for logging because the remote format
* might differ from the local format and thus we don't know how much to
* log here. Note that init_fn must also set the buffer log item type
* correctly.
*/
init_fn(tp, bp, ip, ifp);
/* account for the change in fork size */
xfs_idata_realloc(ip, -ifp->if_bytes, whichfork);
xfs_bmap_local_to_extents_empty(tp, ip, whichfork);
flags |= XFS_ILOG_CORE;
ifp->if_u1.if_root = NULL;
ifp->if_height = 0;
rec.br_startoff = 0;
rec.br_startblock = args.fsbno;
rec.br_blockcount = 1;
rec.br_state = XFS_EXT_NORM;
xfs_iext_first(ifp, &icur);
xfs_iext_insert(ip, &icur, &rec, 0);
ifp->if_nextents = 1;
ip->i_nblocks = 1;
xfs_trans_mod_dquot_byino(tp, ip, XFS_TRANS_DQ_BCOUNT, 1L);
flags |= xfs_ilog_fext(whichfork);
done:
*logflagsp = flags;
return error;
}
/*
* Called from xfs_bmap_add_attrfork to handle btree format files.
*/
STATIC int /* error */
xfs_bmap_add_attrfork_btree(
xfs_trans_t *tp, /* transaction pointer */
xfs_inode_t *ip, /* incore inode pointer */
int *flags) /* inode logging flags */
{
struct xfs_btree_block *block = ip->i_df.if_broot;
struct xfs_btree_cur *cur; /* btree cursor */
int error; /* error return value */
xfs_mount_t *mp; /* file system mount struct */
int stat; /* newroot status */
mp = ip->i_mount;
if (XFS_BMAP_BMDR_SPACE(block) <= xfs_inode_data_fork_size(ip))
*flags |= XFS_ILOG_DBROOT;
else {
cur = xfs_bmbt_init_cursor(mp, tp, ip, XFS_DATA_FORK);
error = xfs_bmbt_lookup_first(cur, &stat);
if (error)
goto error0;
/* must be at least one entry */
if (XFS_IS_CORRUPT(mp, stat != 1)) {
error = -EFSCORRUPTED;
goto error0;
}
if ((error = xfs_btree_new_iroot(cur, flags, &stat)))
goto error0;
if (stat == 0) {
xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
return -ENOSPC;
}
cur->bc_ino.allocated = 0;
xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
}
return 0;
error0:
xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
return error;
}
/*
* Called from xfs_bmap_add_attrfork to handle extents format files.
*/
STATIC int /* error */
xfs_bmap_add_attrfork_extents(
struct xfs_trans *tp, /* transaction pointer */
struct xfs_inode *ip, /* incore inode pointer */
int *flags) /* inode logging flags */
{
struct xfs_btree_cur *cur; /* bmap btree cursor */
int error; /* error return value */
if (ip->i_df.if_nextents * sizeof(struct xfs_bmbt_rec) <=
xfs_inode_data_fork_size(ip))
return 0;
cur = NULL;
error = xfs_bmap_extents_to_btree(tp, ip, &cur, 0, flags,
XFS_DATA_FORK);
if (cur) {
cur->bc_ino.allocated = 0;
xfs_btree_del_cursor(cur, error);
}
return error;
}
/*
* Called from xfs_bmap_add_attrfork to handle local format files. Each
* different data fork content type needs a different callout to do the
* conversion. Some are basic and only require special block initialisation
* callouts for the data formating, others (directories) are so specialised they
* handle everything themselves.
*
* XXX (dgc): investigate whether directory conversion can use the generic
* formatting callout. It should be possible - it's just a very complex
* formatter.
*/
STATIC int /* error */
xfs_bmap_add_attrfork_local(
struct xfs_trans *tp, /* transaction pointer */
struct xfs_inode *ip, /* incore inode pointer */
int *flags) /* inode logging flags */
{
struct xfs_da_args dargs; /* args for dir/attr code */
if (ip->i_df.if_bytes <= xfs_inode_data_fork_size(ip))
return 0;
if (S_ISDIR(VFS_I(ip)->i_mode)) {
memset(&dargs, 0, sizeof(dargs));
dargs.geo = ip->i_mount->m_dir_geo;
dargs.dp = ip;
dargs.total = dargs.geo->fsbcount;
dargs.whichfork = XFS_DATA_FORK;
dargs.trans = tp;
return xfs_dir2_sf_to_block(&dargs);
}
if (S_ISLNK(VFS_I(ip)->i_mode))
return xfs_bmap_local_to_extents(tp, ip, 1, flags,
XFS_DATA_FORK,
xfs_symlink_local_to_remote);
/* should only be called for types that support local format data */
ASSERT(0);
return -EFSCORRUPTED;
}
/*
* Set an inode attr fork offset based on the format of the data fork.
*/
static int
xfs_bmap_set_attrforkoff(
struct xfs_inode *ip,
int size,
int *version)
{
int default_size = xfs_default_attroffset(ip) >> 3;
switch (ip->i_df.if_format) {
case XFS_DINODE_FMT_DEV:
ip->i_forkoff = default_size;
break;
case XFS_DINODE_FMT_LOCAL:
case XFS_DINODE_FMT_EXTENTS:
case XFS_DINODE_FMT_BTREE:
ip->i_forkoff = xfs_attr_shortform_bytesfit(ip, size);
if (!ip->i_forkoff)
ip->i_forkoff = default_size;
else if (xfs_has_attr2(ip->i_mount) && version)
*version = 2;
break;
default:
ASSERT(0);
return -EINVAL;
}
return 0;
}
/*
* Convert inode from non-attributed to attributed.
* Must not be in a transaction, ip must not be locked.
*/
int /* error code */
xfs_bmap_add_attrfork(
xfs_inode_t *ip, /* incore inode pointer */
int size, /* space new attribute needs */
int rsvd) /* xact may use reserved blks */
{
xfs_mount_t *mp; /* mount structure */
xfs_trans_t *tp; /* transaction pointer */
int blks; /* space reservation */
int version = 1; /* superblock attr version */
int logflags; /* logging flags */
int error; /* error return value */
ASSERT(xfs_inode_has_attr_fork(ip) == 0);
mp = ip->i_mount;
ASSERT(!XFS_NOT_DQATTACHED(mp, ip));
blks = XFS_ADDAFORK_SPACE_RES(mp);
error = xfs_trans_alloc_inode(ip, &M_RES(mp)->tr_addafork, blks, 0,
rsvd, &tp);
if (error)
return error;
if (xfs_inode_has_attr_fork(ip))
goto trans_cancel;
xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
error = xfs_bmap_set_attrforkoff(ip, size, &version);
if (error)
goto trans_cancel;
xfs_ifork_init_attr(ip, XFS_DINODE_FMT_EXTENTS, 0);
logflags = 0;
switch (ip->i_df.if_format) {
case XFS_DINODE_FMT_LOCAL:
error = xfs_bmap_add_attrfork_local(tp, ip, &logflags);
break;
case XFS_DINODE_FMT_EXTENTS:
error = xfs_bmap_add_attrfork_extents(tp, ip, &logflags);
break;
case XFS_DINODE_FMT_BTREE:
error = xfs_bmap_add_attrfork_btree(tp, ip, &logflags);
break;
default:
error = 0;
break;
}
if (logflags)
xfs_trans_log_inode(tp, ip, logflags);
if (error)
goto trans_cancel;
if (!xfs_has_attr(mp) ||
(!xfs_has_attr2(mp) && version == 2)) {
bool log_sb = false;
spin_lock(&mp->m_sb_lock);
if (!xfs_has_attr(mp)) {
xfs_add_attr(mp);
log_sb = true;
}
if (!xfs_has_attr2(mp) && version == 2) {
xfs_add_attr2(mp);
log_sb = true;
}
spin_unlock(&mp->m_sb_lock);
if (log_sb)
xfs_log_sb(tp);
}
error = xfs_trans_commit(tp);
xfs_iunlock(ip, XFS_ILOCK_EXCL);
return error;
trans_cancel:
xfs_trans_cancel(tp);
xfs_iunlock(ip, XFS_ILOCK_EXCL);
return error;
}
/*
* Internal and external extent tree search functions.
*/
struct xfs_iread_state {
struct xfs_iext_cursor icur;
xfs_extnum_t loaded;
};
/* Stuff every bmbt record from this block into the incore extent map. */
static int
xfs_iread_bmbt_block(
struct xfs_btree_cur *cur,
int level,
void *priv)
{
struct xfs_iread_state *ir = priv;
struct xfs_mount *mp = cur->bc_mp;
struct xfs_inode *ip = cur->bc_ino.ip;
struct xfs_btree_block *block;
struct xfs_buf *bp;
struct xfs_bmbt_rec *frp;
xfs_extnum_t num_recs;
xfs_extnum_t j;
int whichfork = cur->bc_ino.whichfork;
struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork);
block = xfs_btree_get_block(cur, level, &bp);
/* Abort if we find more records than nextents. */
num_recs = xfs_btree_get_numrecs(block);
if (unlikely(ir->loaded + num_recs > ifp->if_nextents)) {
xfs_warn(ip->i_mount, "corrupt dinode %llu, (btree extents).",
(unsigned long long)ip->i_ino);
xfs_inode_verifier_error(ip, -EFSCORRUPTED, __func__, block,
sizeof(*block), __this_address);
return -EFSCORRUPTED;
}
/* Copy records into the incore cache. */
frp = XFS_BMBT_REC_ADDR(mp, block, 1);
for (j = 0; j < num_recs; j++, frp++, ir->loaded++) {
struct xfs_bmbt_irec new;
xfs_failaddr_t fa;
xfs_bmbt_disk_get_all(frp, &new);
fa = xfs_bmap_validate_extent(ip, whichfork, &new);
if (fa) {
xfs_inode_verifier_error(ip, -EFSCORRUPTED,
"xfs_iread_extents(2)", frp,
sizeof(*frp), fa);
return -EFSCORRUPTED;
}
xfs_iext_insert(ip, &ir->icur, &new,
xfs_bmap_fork_to_state(whichfork));
trace_xfs_read_extent(ip, &ir->icur,
xfs_bmap_fork_to_state(whichfork), _THIS_IP_);
xfs_iext_next(ifp, &ir->icur);
}
return 0;
}
/*
* Read in extents from a btree-format inode.
*/
int
xfs_iread_extents(
struct xfs_trans *tp,
struct xfs_inode *ip,
int whichfork)
{
struct xfs_iread_state ir;
struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork);
struct xfs_mount *mp = ip->i_mount;
struct xfs_btree_cur *cur;
int error;
if (!xfs_need_iread_extents(ifp))
return 0;
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
ir.loaded = 0;
xfs_iext_first(ifp, &ir.icur);
cur = xfs_bmbt_init_cursor(mp, tp, ip, whichfork);
error = xfs_btree_visit_blocks(cur, xfs_iread_bmbt_block,
XFS_BTREE_VISIT_RECORDS, &ir);
xfs_btree_del_cursor(cur, error);
if (error)
goto out;
if (XFS_IS_CORRUPT(mp, ir.loaded != ifp->if_nextents)) {
error = -EFSCORRUPTED;
goto out;
}
ASSERT(ir.loaded == xfs_iext_count(ifp));
return 0;
out:
xfs_iext_destroy(ifp);
return error;
}
/*
* Returns the relative block number of the first unused block(s) in the given
* fork with at least "len" logically contiguous blocks free. This is the
* lowest-address hole if the fork has holes, else the first block past the end
* of fork. Return 0 if the fork is currently local (in-inode).
*/
int /* error */
xfs_bmap_first_unused(
struct xfs_trans *tp, /* transaction pointer */
struct xfs_inode *ip, /* incore inode */
xfs_extlen_t len, /* size of hole to find */
xfs_fileoff_t *first_unused, /* unused block */
int whichfork) /* data or attr fork */
{
struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork);
struct xfs_bmbt_irec got;
struct xfs_iext_cursor icur;
xfs_fileoff_t lastaddr = 0;
xfs_fileoff_t lowest, max;
int error;
if (ifp->if_format == XFS_DINODE_FMT_LOCAL) {
*first_unused = 0;
return 0;
}
ASSERT(xfs_ifork_has_extents(ifp));
error = xfs_iread_extents(tp, ip, whichfork);
if (error)
return error;
lowest = max = *first_unused;
for_each_xfs_iext(ifp, &icur, &got) {
/*
* See if the hole before this extent will work.
*/
if (got.br_startoff >= lowest + len &&
got.br_startoff - max >= len)
break;
lastaddr = got.br_startoff + got.br_blockcount;
max = XFS_FILEOFF_MAX(lastaddr, lowest);
}
*first_unused = max;
return 0;
}
/*
* Returns the file-relative block number of the last block - 1 before
* last_block (input value) in the file.
* This is not based on i_size, it is based on the extent records.
* Returns 0 for local files, as they do not have extent records.
*/
int /* error */
xfs_bmap_last_before(
struct xfs_trans *tp, /* transaction pointer */
struct xfs_inode *ip, /* incore inode */
xfs_fileoff_t *last_block, /* last block */
int whichfork) /* data or attr fork */
{
struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork);
struct xfs_bmbt_irec got;
struct xfs_iext_cursor icur;
int error;
switch (ifp->if_format) {
case XFS_DINODE_FMT_LOCAL:
*last_block = 0;
return 0;
case XFS_DINODE_FMT_BTREE:
case XFS_DINODE_FMT_EXTENTS:
break;
default:
ASSERT(0);
return -EFSCORRUPTED;
}
error = xfs_iread_extents(tp, ip, whichfork);
if (error)
return error;
if (!xfs_iext_lookup_extent_before(ip, ifp, last_block, &icur, &got))
*last_block = 0;
return 0;
}
int
xfs_bmap_last_extent(
struct xfs_trans *tp,
struct xfs_inode *ip,
int whichfork,
struct xfs_bmbt_irec *rec,
int *is_empty)
{
struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork);
struct xfs_iext_cursor icur;
int error;
error = xfs_iread_extents(tp, ip, whichfork);
if (error)
return error;
xfs_iext_last(ifp, &icur);
if (!xfs_iext_get_extent(ifp, &icur, rec))
*is_empty = 1;
else
*is_empty = 0;
return 0;
}
/*
* Check the last inode extent to determine whether this allocation will result
* in blocks being allocated at the end of the file. When we allocate new data
* blocks at the end of the file which do not start at the previous data block,
* we will try to align the new blocks at stripe unit boundaries.
*
* Returns 1 in bma->aeof if the file (fork) is empty as any new write will be
* at, or past the EOF.
*/
STATIC int
xfs_bmap_isaeof(
struct xfs_bmalloca *bma,
int whichfork)
{
struct xfs_bmbt_irec rec;
int is_empty;
int error;
bma->aeof = false;
error = xfs_bmap_last_extent(NULL, bma->ip, whichfork, &rec,
&is_empty);
if (error)
return error;
if (is_empty) {
bma->aeof = true;
return 0;
}
/*
* Check if we are allocation or past the last extent, or at least into
* the last delayed allocated extent.
*/
bma->aeof = bma->offset >= rec.br_startoff + rec.br_blockcount ||
(bma->offset >= rec.br_startoff &&
isnullstartblock(rec.br_startblock));
return 0;
}
/*
* Returns the file-relative block number of the first block past eof in
* the file. This is not based on i_size, it is based on the extent records.
* Returns 0 for local files, as they do not have extent records.
*/
int
xfs_bmap_last_offset(
struct xfs_inode *ip,
xfs_fileoff_t *last_block,
int whichfork)
{
struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork);
struct xfs_bmbt_irec rec;
int is_empty;
int error;
*last_block = 0;
if (ifp->if_format == XFS_DINODE_FMT_LOCAL)
return 0;
if (XFS_IS_CORRUPT(ip->i_mount, !xfs_ifork_has_extents(ifp)))
return -EFSCORRUPTED;
error = xfs_bmap_last_extent(NULL, ip, whichfork, &rec, &is_empty);
if (error || is_empty)
return error;
*last_block = rec.br_startoff + rec.br_blockcount;
return 0;
}
/*
* Extent tree manipulation functions used during allocation.
*/
/*
* Convert a delayed allocation to a real allocation.
*/
STATIC int /* error */
xfs_bmap_add_extent_delay_real(
struct xfs_bmalloca *bma,
int whichfork)
{
struct xfs_mount *mp = bma->ip->i_mount;
struct xfs_ifork *ifp = xfs_ifork_ptr(bma->ip, whichfork);
struct xfs_bmbt_irec *new = &bma->got;
int error; /* error return value */
int i; /* temp state */
xfs_fileoff_t new_endoff; /* end offset of new entry */
xfs_bmbt_irec_t r[3]; /* neighbor extent entries */
/* left is 0, right is 1, prev is 2 */
int rval=0; /* return value (logging flags) */
uint32_t state = xfs_bmap_fork_to_state(whichfork);
xfs_filblks_t da_new; /* new count del alloc blocks used */
xfs_filblks_t da_old; /* old count del alloc blocks used */
xfs_filblks_t temp=0; /* value for da_new calculations */
int tmp_rval; /* partial logging flags */
struct xfs_bmbt_irec old;
ASSERT(whichfork != XFS_ATTR_FORK);
ASSERT(!isnullstartblock(new->br_startblock));
ASSERT(!bma->cur ||
(bma->cur->bc_ino.flags & XFS_BTCUR_BMBT_WASDEL));
XFS_STATS_INC(mp, xs_add_exlist);
#define LEFT r[0]
#define RIGHT r[1]
#define PREV r[2]
/*
* Set up a bunch of variables to make the tests simpler.
*/
xfs_iext_get_extent(ifp, &bma->icur, &PREV);
new_endoff = new->br_startoff + new->br_blockcount;
ASSERT(isnullstartblock(PREV.br_startblock));
ASSERT(PREV.br_startoff <= new->br_startoff);
ASSERT(PREV.br_startoff + PREV.br_blockcount >= new_endoff);
da_old = startblockval(PREV.br_startblock);
da_new = 0;
/*
* Set flags determining what part of the previous delayed allocation
* extent is being replaced by a real allocation.
*/
if (PREV.br_startoff == new->br_startoff)
state |= BMAP_LEFT_FILLING;
if (PREV.br_startoff + PREV.br_blockcount == new_endoff)
state |= BMAP_RIGHT_FILLING;
/*
* Check and set flags if this segment has a left neighbor.
* Don't set contiguous if the combined extent would be too large.
*/
if (xfs_iext_peek_prev_extent(ifp, &bma->icur, &LEFT)) {
state |= BMAP_LEFT_VALID;
if (isnullstartblock(LEFT.br_startblock))
state |= BMAP_LEFT_DELAY;
}
if ((state & BMAP_LEFT_VALID) && !(state & BMAP_LEFT_DELAY) &&
LEFT.br_startoff + LEFT.br_blockcount == new->br_startoff &&
LEFT.br_startblock + LEFT.br_blockcount == new->br_startblock &&
LEFT.br_state == new->br_state &&
LEFT.br_blockcount + new->br_blockcount <= XFS_MAX_BMBT_EXTLEN)
state |= BMAP_LEFT_CONTIG;
/*
* Check and set flags if this segment has a right neighbor.
* Don't set contiguous if the combined extent would be too large.
* Also check for all-three-contiguous being too large.
*/
if (xfs_iext_peek_next_extent(ifp, &bma->icur, &RIGHT)) {
state |= BMAP_RIGHT_VALID;
if (isnullstartblock(RIGHT.br_startblock))
state |= BMAP_RIGHT_DELAY;
}
if ((state & BMAP_RIGHT_VALID) && !(state & BMAP_RIGHT_DELAY) &&
new_endoff == RIGHT.br_startoff &&
new->br_startblock + new->br_blockcount == RIGHT.br_startblock &&
new->br_state == RIGHT.br_state &&
new->br_blockcount + RIGHT.br_blockcount <= XFS_MAX_BMBT_EXTLEN &&
((state & (BMAP_LEFT_CONTIG | BMAP_LEFT_FILLING |
BMAP_RIGHT_FILLING)) !=
(BMAP_LEFT_CONTIG | BMAP_LEFT_FILLING |
BMAP_RIGHT_FILLING) ||
LEFT.br_blockcount + new->br_blockcount + RIGHT.br_blockcount
<= XFS_MAX_BMBT_EXTLEN))
state |= BMAP_RIGHT_CONTIG;
error = 0;
/*
* Switch out based on the FILLING and CONTIG state bits.
*/
switch (state & (BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG |
BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG)) {
case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG |
BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
/*
* Filling in all of a previously delayed allocation extent.
* The left and right neighbors are both contiguous with new.
*/
LEFT.br_blockcount += PREV.br_blockcount + RIGHT.br_blockcount;
xfs_iext_remove(bma->ip, &bma->icur, state);
xfs_iext_remove(bma->ip, &bma->icur, state);
xfs_iext_prev(ifp, &bma->icur);
xfs_iext_update_extent(bma->ip, state, &bma->icur, &LEFT);
ifp->if_nextents--;
if (bma->cur == NULL)
rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
else {
rval = XFS_ILOG_CORE;
error = xfs_bmbt_lookup_eq(bma->cur, &RIGHT, &i);
if (error)
goto done;
if (XFS_IS_CORRUPT(mp, i != 1)) {
error = -EFSCORRUPTED;
goto done;
}
error = xfs_btree_delete(bma->cur, &i);
if (error)
goto done;
if (XFS_IS_CORRUPT(mp, i != 1)) {
error = -EFSCORRUPTED;
goto done;
}
error = xfs_btree_decrement(bma->cur, 0, &i);
if (error)
goto done;
if (XFS_IS_CORRUPT(mp, i != 1)) {
error = -EFSCORRUPTED;
goto done;
}
error = xfs_bmbt_update(bma->cur, &LEFT);
if (error)
goto done;
}
break;
case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG:
/*
* Filling in all of a previously delayed allocation extent.
* The left neighbor is contiguous, the right is not.
*/
old = LEFT;
LEFT.br_blockcount += PREV.br_blockcount;
xfs_iext_remove(bma->ip, &bma->icur, state);
xfs_iext_prev(ifp, &bma->icur);
xfs_iext_update_extent(bma->ip, state, &bma->icur, &LEFT);
if (bma->cur == NULL)
rval = XFS_ILOG_DEXT;
else {
rval = 0;
error = xfs_bmbt_lookup_eq(bma->cur, &old, &i);
if (error)
goto done;
if (XFS_IS_CORRUPT(mp, i != 1)) {
error = -EFSCORRUPTED;
goto done;
}
error = xfs_bmbt_update(bma->cur, &LEFT);
if (error)
goto done;
}
break;
case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
/*
* Filling in all of a previously delayed allocation extent.
* The right neighbor is contiguous, the left is not. Take care
* with delay -> unwritten extent allocation here because the
* delalloc record we are overwriting is always written.
*/
PREV.br_startblock = new->br_startblock;
PREV.br_blockcount += RIGHT.br_blockcount;
PREV.br_state = new->br_state;
xfs_iext_next(ifp, &bma->icur);
xfs_iext_remove(bma->ip, &bma->icur, state);
xfs_iext_prev(ifp, &bma->icur);
xfs_iext_update_extent(bma->ip, state, &bma->icur, &PREV);
if (bma->cur == NULL)
rval = XFS_ILOG_DEXT;
else {
rval = 0;
error = xfs_bmbt_lookup_eq(bma->cur, &RIGHT, &i);
if (error)
goto done;
if (XFS_IS_CORRUPT(mp, i != 1)) {
error = -EFSCORRUPTED;
goto done;
}
error = xfs_bmbt_update(bma->cur, &PREV);
if (error)
goto done;
}
break;
case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING:
/*
* Filling in all of a previously delayed allocation extent.
* Neither the left nor right neighbors are contiguous with
* the new one.
*/
PREV.br_startblock = new->br_startblock;
PREV.br_state = new->br_state;
xfs_iext_update_extent(bma->ip, state, &bma->icur, &PREV);
ifp->if_nextents++;
if (bma->cur == NULL)
rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
else {
rval = XFS_ILOG_CORE;
error = xfs_bmbt_lookup_eq(bma->cur, new, &i);
if (error)
goto done;
if (XFS_IS_CORRUPT(mp, i != 0)) {
error = -EFSCORRUPTED;
goto done;
}
error = xfs_btree_insert(bma->cur, &i);
if (error)
goto done;
if (XFS_IS_CORRUPT(mp, i != 1)) {
error = -EFSCORRUPTED;
goto done;
}
}
break;
case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG:
/*
* Filling in the first part of a previous delayed allocation.
* The left neighbor is contiguous.
*/
old = LEFT;
temp = PREV.br_blockcount - new->br_blockcount;
da_new = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(bma->ip, temp),
startblockval(PREV.br_startblock));
LEFT.br_blockcount += new->br_blockcount;
PREV.br_blockcount = temp;
PREV.br_startoff += new->br_blockcount;
PREV.br_startblock = nullstartblock(da_new);
xfs_iext_update_extent(bma->ip, state, &bma->icur, &PREV);
xfs_iext_prev(ifp, &bma->icur);
xfs_iext_update_extent(bma->ip, state, &bma->icur, &LEFT);
if (bma->cur == NULL)
rval = XFS_ILOG_DEXT;
else {
rval = 0;
error = xfs_bmbt_lookup_eq(bma->cur, &old, &i);
if (error)
goto done;
if (XFS_IS_CORRUPT(mp, i != 1)) {
error = -EFSCORRUPTED;
goto done;
}
error = xfs_bmbt_update(bma->cur, &LEFT);
if (error)
goto done;
}
break;
case BMAP_LEFT_FILLING:
/*
* Filling in the first part of a previous delayed allocation.
* The left neighbor is not contiguous.
*/
xfs_iext_update_extent(bma->ip, state, &bma->icur, new);
ifp->if_nextents++;
if (bma->cur == NULL)
rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
else {
rval = XFS_ILOG_CORE;
error = xfs_bmbt_lookup_eq(bma->cur, new, &i);
if (error)
goto done;
if (XFS_IS_CORRUPT(mp, i != 0)) {
error = -EFSCORRUPTED;
goto done;
}
error = xfs_btree_insert(bma->cur, &i);
if (error)
goto done;
if (XFS_IS_CORRUPT(mp, i != 1)) {
error = -EFSCORRUPTED;
goto done;
}
}
if (xfs_bmap_needs_btree(bma->ip, whichfork)) {
error = xfs_bmap_extents_to_btree(bma->tp, bma->ip,
&bma->cur, 1, &tmp_rval, whichfork);
rval |= tmp_rval;
if (error)
goto done;
}
temp = PREV.br_blockcount - new->br_blockcount;
da_new = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(bma->ip, temp),
startblockval(PREV.br_startblock) -
(bma->cur ? bma->cur->bc_ino.allocated : 0));
PREV.br_startoff = new_endoff;
PREV.br_blockcount = temp;
PREV.br_startblock = nullstartblock(da_new);
xfs_iext_next(ifp, &bma->icur);
xfs_iext_insert(bma->ip, &bma->icur, &PREV, state);
xfs_iext_prev(ifp, &bma->icur);
break;
case BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
/*
* Filling in the last part of a previous delayed allocation.
* The right neighbor is contiguous with the new allocation.
*/
old = RIGHT;
RIGHT.br_startoff = new->br_startoff;
RIGHT.br_startblock = new->br_startblock;
RIGHT.br_blockcount += new->br_blockcount;
if (bma->cur == NULL)
rval = XFS_ILOG_DEXT;
else {
rval = 0;
error = xfs_bmbt_lookup_eq(bma->cur, &old, &i);
if (error)
goto done;
if (XFS_IS_CORRUPT(mp, i != 1)) {
error = -EFSCORRUPTED;
goto done;
}
error = xfs_bmbt_update(bma->cur, &RIGHT);
if (error)
goto done;
}
temp = PREV.br_blockcount - new->br_blockcount;
da_new = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(bma->ip, temp),
startblockval(PREV.br_startblock));
PREV.br_blockcount = temp;
PREV.br_startblock = nullstartblock(da_new);
xfs_iext_update_extent(bma->ip, state, &bma->icur, &PREV);
xfs_iext_next(ifp, &bma->icur);
xfs_iext_update_extent(bma->ip, state, &bma->icur, &RIGHT);
break;
case BMAP_RIGHT_FILLING:
/*
* Filling in the last part of a previous delayed allocation.
* The right neighbor is not contiguous.
*/
xfs_iext_update_extent(bma->ip, state, &bma->icur, new);
ifp->if_nextents++;
if (bma->cur == NULL)
rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
else {
rval = XFS_ILOG_CORE;
error = xfs_bmbt_lookup_eq(bma->cur, new, &i);
if (error)
goto done;
if (XFS_IS_CORRUPT(mp, i != 0)) {
error = -EFSCORRUPTED;
goto done;
}
error = xfs_btree_insert(bma->cur, &i);
if (error)
goto done;
if (XFS_IS_CORRUPT(mp, i != 1)) {
error = -EFSCORRUPTED;
goto done;
}
}
if (xfs_bmap_needs_btree(bma->ip, whichfork)) {
error = xfs_bmap_extents_to_btree(bma->tp, bma->ip,
&bma->cur, 1, &tmp_rval, whichfork);
rval |= tmp_rval;
if (error)
goto done;
}
temp = PREV.br_blockcount - new->br_blockcount;
da_new = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(bma->ip, temp),
startblockval(PREV.br_startblock) -
(bma->cur ? bma->cur->bc_ino.allocated : 0));
PREV.br_startblock = nullstartblock(da_new);
PREV.br_blockcount = temp;
xfs_iext_insert(bma->ip, &bma->icur, &PREV, state);
xfs_iext_next(ifp, &bma->icur);
break;
case 0:
/*
* Filling in the middle part of a previous delayed allocation.
* Contiguity is impossible here.
* This case is avoided almost all the time.
*
* We start with a delayed allocation:
*
* +ddddddddddddddddddddddddddddddddddddddddddddddddddddddd+
* PREV @ idx
*
* and we are allocating:
* +rrrrrrrrrrrrrrrrr+
* new
*
* and we set it up for insertion as:
* +ddddddddddddddddddd+rrrrrrrrrrrrrrrrr+ddddddddddddddddd+
* new
* PREV @ idx LEFT RIGHT
* inserted at idx + 1
*/
old = PREV;
/* LEFT is the new middle */
LEFT = *new;
/* RIGHT is the new right */
RIGHT.br_state = PREV.br_state;
RIGHT.br_startoff = new_endoff;
RIGHT.br_blockcount =
PREV.br_startoff + PREV.br_blockcount - new_endoff;
RIGHT.br_startblock =
nullstartblock(xfs_bmap_worst_indlen(bma->ip,
RIGHT.br_blockcount));
/* truncate PREV */
PREV.br_blockcount = new->br_startoff - PREV.br_startoff;
PREV.br_startblock =
nullstartblock(xfs_bmap_worst_indlen(bma->ip,
PREV.br_blockcount));
xfs_iext_update_extent(bma->ip, state, &bma->icur, &PREV);
xfs_iext_next(ifp, &bma->icur);
xfs_iext_insert(bma->ip, &bma->icur, &RIGHT, state);
xfs_iext_insert(bma->ip, &bma->icur, &LEFT, state);
ifp->if_nextents++;
if (bma->cur == NULL)
rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
else {
rval = XFS_ILOG_CORE;
error = xfs_bmbt_lookup_eq(bma->cur, new, &i);
if (error)
goto done;
if (XFS_IS_CORRUPT(mp, i != 0)) {
error = -EFSCORRUPTED;
goto done;
}
error = xfs_btree_insert(bma->cur, &i);
if (error)
goto done;
if (XFS_IS_CORRUPT(mp, i != 1)) {
error = -EFSCORRUPTED;
goto done;
}
}
if (xfs_bmap_needs_btree(bma->ip, whichfork)) {
error = xfs_bmap_extents_to_btree(bma->tp, bma->ip,
&bma->cur, 1, &tmp_rval, whichfork);
rval |= tmp_rval;
if (error)
goto done;
}
da_new = startblockval(PREV.br_startblock) +
startblockval(RIGHT.br_startblock);
break;
case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
case BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
case BMAP_LEFT_FILLING | BMAP_RIGHT_CONTIG:
case BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG:
case BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
case BMAP_LEFT_CONTIG:
case BMAP_RIGHT_CONTIG:
/*
* These cases are all impossible.
*/
ASSERT(0);
}
/* add reverse mapping unless caller opted out */
if (!(bma->flags & XFS_BMAPI_NORMAP))
xfs_rmap_map_extent(bma->tp, bma->ip, whichfork, new);
/* convert to a btree if necessary */
if (xfs_bmap_needs_btree(bma->ip, whichfork)) {
int tmp_logflags; /* partial log flag return val */
ASSERT(bma->cur == NULL);
error = xfs_bmap_extents_to_btree(bma->tp, bma->ip,
&bma->cur, da_old > 0, &tmp_logflags,
whichfork);
bma->logflags |= tmp_logflags;
if (error)
goto done;
}
if (da_new != da_old)
xfs_mod_delalloc(mp, (int64_t)da_new - da_old);
if (bma->cur) {
da_new += bma->cur->bc_ino.allocated;
bma->cur->bc_ino.allocated = 0;
}
/* adjust for changes in reserved delayed indirect blocks */
if (da_new != da_old) {
ASSERT(state == 0 || da_new < da_old);
error = xfs_mod_fdblocks(mp, (int64_t)(da_old - da_new),
false);
}
xfs_bmap_check_leaf_extents(bma->cur, bma->ip, whichfork);
done:
if (whichfork != XFS_COW_FORK)
bma->logflags |= rval;
return error;
#undef LEFT
#undef RIGHT
#undef PREV
}
/*
* Convert an unwritten allocation to a real allocation or vice versa.
*/
int /* error */
xfs_bmap_add_extent_unwritten_real(
struct xfs_trans *tp,
xfs_inode_t *ip, /* incore inode pointer */
int whichfork,
struct xfs_iext_cursor *icur,
struct xfs_btree_cur **curp, /* if *curp is null, not a btree */
xfs_bmbt_irec_t *new, /* new data to add to file extents */
int *logflagsp) /* inode logging flags */
{
struct xfs_btree_cur *cur; /* btree cursor */
int error; /* error return value */
int i; /* temp state */
struct xfs_ifork *ifp; /* inode fork pointer */
xfs_fileoff_t new_endoff; /* end offset of new entry */
xfs_bmbt_irec_t r[3]; /* neighbor extent entries */
/* left is 0, right is 1, prev is 2 */
int rval=0; /* return value (logging flags) */
uint32_t state = xfs_bmap_fork_to_state(whichfork);
struct xfs_mount *mp = ip->i_mount;
struct xfs_bmbt_irec old;
*logflagsp = 0;
cur = *curp;
ifp = xfs_ifork_ptr(ip, whichfork);
ASSERT(!isnullstartblock(new->br_startblock));
XFS_STATS_INC(mp, xs_add_exlist);
#define LEFT r[0]
#define RIGHT r[1]
#define PREV r[2]
/*
* Set up a bunch of variables to make the tests simpler.
*/
error = 0;
xfs_iext_get_extent(ifp, icur, &PREV);
ASSERT(new->br_state != PREV.br_state);
new_endoff = new->br_startoff + new->br_blockcount;
ASSERT(PREV.br_startoff <= new->br_startoff);
ASSERT(PREV.br_startoff + PREV.br_blockcount >= new_endoff);
/*
* Set flags determining what part of the previous oldext allocation
* extent is being replaced by a newext allocation.
*/
if (PREV.br_startoff == new->br_startoff)
state |= BMAP_LEFT_FILLING;
if (PREV.br_startoff + PREV.br_blockcount == new_endoff)
state |= BMAP_RIGHT_FILLING;
/*
* Check and set flags if this segment has a left neighbor.
* Don't set contiguous if the combined extent would be too large.
*/
if (xfs_iext_peek_prev_extent(ifp, icur, &LEFT)) {
state |= BMAP_LEFT_VALID;
if (isnullstartblock(LEFT.br_startblock))
state |= BMAP_LEFT_DELAY;
}
if ((state & BMAP_LEFT_VALID) && !(state & BMAP_LEFT_DELAY) &&
LEFT.br_startoff + LEFT.br_blockcount == new->br_startoff &&
LEFT.br_startblock + LEFT.br_blockcount == new->br_startblock &&
LEFT.br_state == new->br_state &&
LEFT.br_blockcount + new->br_blockcount <= XFS_MAX_BMBT_EXTLEN)
state |= BMAP_LEFT_CONTIG;
/*
* Check and set flags if this segment has a right neighbor.
* Don't set contiguous if the combined extent would be too large.
* Also check for all-three-contiguous being too large.
*/
if (xfs_iext_peek_next_extent(ifp, icur, &RIGHT)) {
state |= BMAP_RIGHT_VALID;
if (isnullstartblock(RIGHT.br_startblock))
state |= BMAP_RIGHT_DELAY;
}
if ((state & BMAP_RIGHT_VALID) && !(state & BMAP_RIGHT_DELAY) &&
new_endoff == RIGHT.br_startoff &&
new->br_startblock + new->br_blockcount == RIGHT.br_startblock &&
new->br_state == RIGHT.br_state &&
new->br_blockcount + RIGHT.br_blockcount <= XFS_MAX_BMBT_EXTLEN &&
((state & (BMAP_LEFT_CONTIG | BMAP_LEFT_FILLING |
BMAP_RIGHT_FILLING)) !=
(BMAP_LEFT_CONTIG | BMAP_LEFT_FILLING |
BMAP_RIGHT_FILLING) ||
LEFT.br_blockcount + new->br_blockcount + RIGHT.br_blockcount
<= XFS_MAX_BMBT_EXTLEN))
state |= BMAP_RIGHT_CONTIG;
/*
* Switch out based on the FILLING and CONTIG state bits.
*/
switch (state & (BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG |
BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG)) {
case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG |
BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
/*
* Setting all of a previous oldext extent to newext.
* The left and right neighbors are both contiguous with new.
*/
LEFT.br_blockcount += PREV.br_blockcount + RIGHT.br_blockcount;
xfs_iext_remove(ip, icur, state);
xfs_iext_remove(ip, icur, state);
xfs_iext_prev(ifp, icur);
xfs_iext_update_extent(ip, state, icur, &LEFT);
ifp->if_nextents -= 2;
if (cur == NULL)
rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
else {
rval = XFS_ILOG_CORE;
error = xfs_bmbt_lookup_eq(cur, &RIGHT, &i);
if (error)
goto done;
if (XFS_IS_CORRUPT(mp, i != 1)) {
error = -EFSCORRUPTED;
goto done;
}
if ((error = xfs_btree_delete(cur, &i)))
goto done;
if (XFS_IS_CORRUPT(mp, i != 1)) {
error = -EFSCORRUPTED;
goto done;
}
if ((error = xfs_btree_decrement(cur, 0, &i)))
goto done;
if (XFS_IS_CORRUPT(mp, i != 1)) {
error = -EFSCORRUPTED;
goto done;
}
if ((error = xfs_btree_delete(cur, &i)))
goto done;
if (XFS_IS_CORRUPT(mp, i != 1)) {
error = -EFSCORRUPTED;
goto done;
}
if ((error = xfs_btree_decrement(cur, 0, &i)))
goto done;
if (XFS_IS_CORRUPT(mp, i != 1)) {
error = -EFSCORRUPTED;
goto done;
}
error = xfs_bmbt_update(cur, &LEFT);
if (error)
goto done;
}
break;
case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG:
/*
* Setting all of a previous oldext extent to newext.
* The left neighbor is contiguous, the right is not.
*/
LEFT.br_blockcount += PREV.br_blockcount;
xfs_iext_remove(ip, icur, state);
xfs_iext_prev(ifp, icur);
xfs_iext_update_extent(ip, state, icur, &LEFT);
ifp->if_nextents--;
if (cur == NULL)
rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
else {
rval = XFS_ILOG_CORE;
error = xfs_bmbt_lookup_eq(cur, &PREV, &i);
if (error)
goto done;
if (XFS_IS_CORRUPT(mp, i != 1)) {
error = -EFSCORRUPTED;
goto done;
}
if ((error = xfs_btree_delete(cur, &i)))
goto done;
if (XFS_IS_CORRUPT(mp, i != 1)) {
error = -EFSCORRUPTED;
goto done;
}
if ((error = xfs_btree_decrement(cur, 0, &i)))
goto done;
if (XFS_IS_CORRUPT(mp, i != 1)) {
error = -EFSCORRUPTED;
goto done;
}
error = xfs_bmbt_update(cur, &LEFT);
if (error)
goto done;
}
break;
case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
/*
* Setting all of a previous oldext extent to newext.
* The right neighbor is contiguous, the left is not.
*/
PREV.br_blockcount += RIGHT.br_blockcount;
PREV.br_state = new->br_state;
xfs_iext_next(ifp, icur);
xfs_iext_remove(ip, icur, state);
xfs_iext_prev(ifp, icur);
xfs_iext_update_extent(ip, state, icur, &PREV);
ifp->if_nextents--;
if (cur == NULL)
rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
else {
rval = XFS_ILOG_CORE;
error = xfs_bmbt_lookup_eq(cur, &RIGHT, &i);
if (error)
goto done;
if (XFS_IS_CORRUPT(mp, i != 1)) {
error = -EFSCORRUPTED;
goto done;
}
if ((error = xfs_btree_delete(cur, &i)))
goto done;
if (XFS_IS_CORRUPT(mp, i != 1)) {
error = -EFSCORRUPTED;
goto done;
}
if ((error = xfs_btree_decrement(cur, 0, &i)))
goto done;
if (XFS_IS_CORRUPT(mp, i != 1)) {
error = -EFSCORRUPTED;
goto done;
}
error = xfs_bmbt_update(cur, &PREV);
if (error)
goto done;
}
break;
case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING:
/*
* Setting all of a previous oldext extent to newext.
* Neither the left nor right neighbors are contiguous with
* the new one.
*/
PREV.br_state = new->br_state;
xfs_iext_update_extent(ip, state, icur, &PREV);
if (cur == NULL)
rval = XFS_ILOG_DEXT;
else {
rval = 0;
error = xfs_bmbt_lookup_eq(cur, new, &i);
if (error)
goto done;
if (XFS_IS_CORRUPT(mp, i != 1)) {
error = -EFSCORRUPTED;
goto done;
}
error = xfs_bmbt_update(cur, &PREV);
if (error)
goto done;
}
break;
case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG:
/*
* Setting the first part of a previous oldext extent to newext.
* The left neighbor is contiguous.
*/
LEFT.br_blockcount += new->br_blockcount;
old = PREV;
PREV.br_startoff += new->br_blockcount;
PREV.br_startblock += new->br_blockcount;
PREV.br_blockcount -= new->br_blockcount;
xfs_iext_update_extent(ip, state, icur, &PREV);
xfs_iext_prev(ifp, icur);
xfs_iext_update_extent(ip, state, icur, &LEFT);
if (cur == NULL)
rval = XFS_ILOG_DEXT;
else {
rval = 0;
error = xfs_bmbt_lookup_eq(cur, &old, &i);
if (error)
goto done;
if (XFS_IS_CORRUPT(mp, i != 1)) {
error = -EFSCORRUPTED;
goto done;
}
error = xfs_bmbt_update(cur, &PREV);
if (error)
goto done;
error = xfs_btree_decrement(cur, 0, &i);
if (error)
goto done;
error = xfs_bmbt_update(cur, &LEFT);
if (error)
goto done;
}
break;
case BMAP_LEFT_FILLING:
/*
* Setting the first part of a previous oldext extent to newext.
* The left neighbor is not contiguous.
*/
old = PREV;
PREV.br_startoff += new->br_blockcount;
PREV.br_startblock += new->br_blockcount;
PREV.br_blockcount -= new->br_blockcount;
xfs_iext_update_extent(ip, state, icur, &PREV);
xfs_iext_insert(ip, icur, new, state);
ifp->if_nextents++;
if (cur == NULL)
rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
else {
rval = XFS_ILOG_CORE;
error = xfs_bmbt_lookup_eq(cur, &old, &i);
if (error)
goto done;
if (XFS_IS_CORRUPT(mp, i != 1)) {
error = -EFSCORRUPTED;
goto done;
}
error = xfs_bmbt_update(cur, &PREV);
if (error)
goto done;
cur->bc_rec.b = *new;
if ((error = xfs_btree_insert(cur, &i)))
goto done;
if (XFS_IS_CORRUPT(mp, i != 1)) {
error = -EFSCORRUPTED;
goto done;
}
}
break;
case BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
/*
* Setting the last part of a previous oldext extent to newext.
* The right neighbor is contiguous with the new allocation.
*/
old = PREV;
PREV.br_blockcount -= new->br_blockcount;
RIGHT.br_startoff = new->br_startoff;
RIGHT.br_startblock = new->br_startblock;
RIGHT.br_blockcount += new->br_blockcount;
xfs_iext_update_extent(ip, state, icur, &PREV);
xfs_iext_next(ifp, icur);
xfs_iext_update_extent(ip, state, icur, &RIGHT);
if (cur == NULL)
rval = XFS_ILOG_DEXT;
else {
rval = 0;
error = xfs_bmbt_lookup_eq(cur, &old, &i);
if (error)
goto done;
if (XFS_IS_CORRUPT(mp, i != 1)) {
error = -EFSCORRUPTED;
goto done;
}
error = xfs_bmbt_update(cur, &PREV);
if (error)
goto done;
error = xfs_btree_increment(cur, 0, &i);
if (error)
goto done;
error = xfs_bmbt_update(cur, &RIGHT);
if (error)
goto done;
}
break;
case BMAP_RIGHT_FILLING:
/*
* Setting the last part of a previous oldext extent to newext.
* The right neighbor is not contiguous.
*/
old = PREV;
PREV.br_blockcount -= new->br_blockcount;
xfs_iext_update_extent(ip, state, icur, &PREV);
xfs_iext_next(ifp, icur);
xfs_iext_insert(ip, icur, new, state);
ifp->if_nextents++;
if (cur == NULL)
rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
else {
rval = XFS_ILOG_CORE;
error = xfs_bmbt_lookup_eq(cur, &old, &i);
if (error)
goto done;
if (XFS_IS_CORRUPT(mp, i != 1)) {
error = -EFSCORRUPTED;
goto done;
}
error = xfs_bmbt_update(cur, &PREV);
if (error)
goto done;
error = xfs_bmbt_lookup_eq(cur, new, &i);
if (error)
goto done;
if (XFS_IS_CORRUPT(mp, i != 0)) {
error = -EFSCORRUPTED;
goto done;
}
if ((error = xfs_btree_insert(cur, &i)))
goto done;
if (XFS_IS_CORRUPT(mp, i != 1)) {
error = -EFSCORRUPTED;
goto done;
}
}
break;
case 0:
/*
* Setting the middle part of a previous oldext extent to
* newext. Contiguity is impossible here.
* One extent becomes three extents.
*/
old = PREV;
PREV.br_blockcount = new->br_startoff - PREV.br_startoff;
r[0] = *new;
r[1].br_startoff = new_endoff;
r[1].br_blockcount =
old.br_startoff + old.br_blockcount - new_endoff;
r[1].br_startblock = new->br_startblock + new->br_blockcount;
r[1].br_state = PREV.br_state;
xfs_iext_update_extent(ip, state, icur, &PREV);
xfs_iext_next(ifp, icur);
xfs_iext_insert(ip, icur, &r[1], state);
xfs_iext_insert(ip, icur, &r[0], state);
ifp->if_nextents += 2;
if (cur == NULL)
rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
else {
rval = XFS_ILOG_CORE;
error = xfs_bmbt_lookup_eq(cur, &old, &i);
if (error)
goto done;
if (XFS_IS_CORRUPT(mp, i != 1)) {
error = -EFSCORRUPTED;
goto done;
}
/* new right extent - oldext */
error = xfs_bmbt_update(cur, &r[1]);
if (error)
goto done;
/* new left extent - oldext */
cur->bc_rec.b = PREV;
if ((error = xfs_btree_insert(cur, &i)))
goto done;
if (XFS_IS_CORRUPT(mp, i != 1)) {
error = -EFSCORRUPTED;
goto done;
}
/*
* Reset the cursor to the position of the new extent
* we are about to insert as we can't trust it after
* the previous insert.
*/
error = xfs_bmbt_lookup_eq(cur, new, &i);
if (error)
goto done;
if (XFS_IS_CORRUPT(mp, i != 0)) {
error = -EFSCORRUPTED;
goto done;
}
/* new middle extent - newext */
if ((error = xfs_btree_insert(cur, &i)))
goto done;
if (XFS_IS_CORRUPT(mp, i != 1)) {
error = -EFSCORRUPTED;
goto done;
}
}
break;
case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
case BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
case BMAP_LEFT_FILLING | BMAP_RIGHT_CONTIG:
case BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG:
case BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
case BMAP_LEFT_CONTIG:
case BMAP_RIGHT_CONTIG:
/*
* These cases are all impossible.
*/
ASSERT(0);
}
/* update reverse mappings */
xfs_rmap_convert_extent(mp, tp, ip, whichfork, new);
/* convert to a btree if necessary */
if (xfs_bmap_needs_btree(ip, whichfork)) {
int tmp_logflags; /* partial log flag return val */
ASSERT(cur == NULL);
error = xfs_bmap_extents_to_btree(tp, ip, &cur, 0,
&tmp_logflags, whichfork);
*logflagsp |= tmp_logflags;
if (error)
goto done;
}
/* clear out the allocated field, done with it now in any case. */
if (cur) {
cur->bc_ino.allocated = 0;
*curp = cur;
}
xfs_bmap_check_leaf_extents(*curp, ip, whichfork);
done:
*logflagsp |= rval;
return error;
#undef LEFT
#undef RIGHT
#undef PREV
}
/*
* Convert a hole to a delayed allocation.
*/
STATIC void
xfs_bmap_add_extent_hole_delay(
xfs_inode_t *ip, /* incore inode pointer */
int whichfork,
struct xfs_iext_cursor *icur,
xfs_bmbt_irec_t *new) /* new data to add to file extents */
{
struct xfs_ifork *ifp; /* inode fork pointer */
xfs_bmbt_irec_t left; /* left neighbor extent entry */
xfs_filblks_t newlen=0; /* new indirect size */
xfs_filblks_t oldlen=0; /* old indirect size */
xfs_bmbt_irec_t right; /* right neighbor extent entry */
uint32_t state = xfs_bmap_fork_to_state(whichfork);
xfs_filblks_t temp; /* temp for indirect calculations */
ifp = xfs_ifork_ptr(ip, whichfork);
ASSERT(isnullstartblock(new->br_startblock));
/*
* Check and set flags if this segment has a left neighbor
*/
if (xfs_iext_peek_prev_extent(ifp, icur, &left)) {
state |= BMAP_LEFT_VALID;
if (isnullstartblock(left.br_startblock))
state |= BMAP_LEFT_DELAY;
}
/*
* Check and set flags if the current (right) segment exists.
* If it doesn't exist, we're converting the hole at end-of-file.
*/
if (xfs_iext_get_extent(ifp, icur, &right)) {
state |= BMAP_RIGHT_VALID;
if (isnullstartblock(right.br_startblock))
state |= BMAP_RIGHT_DELAY;
}
/*
* Set contiguity flags on the left and right neighbors.
* Don't let extents get too large, even if the pieces are contiguous.
*/
if ((state & BMAP_LEFT_VALID) && (state & BMAP_LEFT_DELAY) &&
left.br_startoff + left.br_blockcount == new->br_startoff &&
left.br_blockcount + new->br_blockcount <= XFS_MAX_BMBT_EXTLEN)
state |= BMAP_LEFT_CONTIG;
if ((state & BMAP_RIGHT_VALID) && (state & BMAP_RIGHT_DELAY) &&
new->br_startoff + new->br_blockcount == right.br_startoff &&
new->br_blockcount + right.br_blockcount <= XFS_MAX_BMBT_EXTLEN &&
(!(state & BMAP_LEFT_CONTIG) ||
(left.br_blockcount + new->br_blockcount +
right.br_blockcount <= XFS_MAX_BMBT_EXTLEN)))
state |= BMAP_RIGHT_CONTIG;
/*
* Switch out based on the contiguity flags.
*/
switch (state & (BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG)) {
case BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
/*
* New allocation is contiguous with delayed allocations
* on the left and on the right.
* Merge all three into a single extent record.
*/
temp = left.br_blockcount + new->br_blockcount +
right.br_blockcount;
oldlen = startblockval(left.br_startblock) +
startblockval(new->br_startblock) +
startblockval(right.br_startblock);
newlen = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
oldlen);
left.br_startblock = nullstartblock(newlen);
left.br_blockcount = temp;
xfs_iext_remove(ip, icur, state);
xfs_iext_prev(ifp, icur);
xfs_iext_update_extent(ip, state, icur, &left);
break;
case BMAP_LEFT_CONTIG:
/*
* New allocation is contiguous with a delayed allocation
* on the left.
* Merge the new allocation with the left neighbor.
*/
temp = left.br_blockcount + new->br_blockcount;
oldlen = startblockval(left.br_startblock) +
startblockval(new->br_startblock);
newlen = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
oldlen);
left.br_blockcount = temp;
left.br_startblock = nullstartblock(newlen);
xfs_iext_prev(ifp, icur);
xfs_iext_update_extent(ip, state, icur, &left);
break;
case BMAP_RIGHT_CONTIG:
/*
* New allocation is contiguous with a delayed allocation
* on the right.
* Merge the new allocation with the right neighbor.
*/
temp = new->br_blockcount + right.br_blockcount;
oldlen = startblockval(new->br_startblock) +
startblockval(right.br_startblock);
newlen = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
oldlen);
right.br_startoff = new->br_startoff;
right.br_startblock = nullstartblock(newlen);
right.br_blockcount = temp;
xfs_iext_update_extent(ip, state, icur, &right);
break;
case 0:
/*
* New allocation is not contiguous with another
* delayed allocation.
* Insert a new entry.
*/
oldlen = newlen = 0;
xfs_iext_insert(ip, icur, new, state);
break;
}
if (oldlen != newlen) {
ASSERT(oldlen > newlen);
xfs_mod_fdblocks(ip->i_mount, (int64_t)(oldlen - newlen),
false);
/*
* Nothing to do for disk quota accounting here.
*/
xfs_mod_delalloc(ip->i_mount, (int64_t)newlen - oldlen);
}
}
/*
* Convert a hole to a real allocation.
*/
STATIC int /* error */
xfs_bmap_add_extent_hole_real(
struct xfs_trans *tp,
struct xfs_inode *ip,
int whichfork,
struct xfs_iext_cursor *icur,
struct xfs_btree_cur **curp,
struct xfs_bmbt_irec *new,
int *logflagsp,
uint32_t flags)
{
struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork);
struct xfs_mount *mp = ip->i_mount;
struct xfs_btree_cur *cur = *curp;
int error; /* error return value */
int i; /* temp state */
xfs_bmbt_irec_t left; /* left neighbor extent entry */
xfs_bmbt_irec_t right; /* right neighbor extent entry */
int rval=0; /* return value (logging flags) */
uint32_t state = xfs_bmap_fork_to_state(whichfork);
struct xfs_bmbt_irec old;
ASSERT(!isnullstartblock(new->br_startblock));
ASSERT(!cur || !(cur->bc_ino.flags & XFS_BTCUR_BMBT_WASDEL));
XFS_STATS_INC(mp, xs_add_exlist);
/*
* Check and set flags if this segment has a left neighbor.
*/
if (xfs_iext_peek_prev_extent(ifp, icur, &left)) {
state |= BMAP_LEFT_VALID;
if (isnullstartblock(left.br_startblock))
state |= BMAP_LEFT_DELAY;
}
/*
* Check and set flags if this segment has a current value.
* Not true if we're inserting into the "hole" at eof.
*/
if (xfs_iext_get_extent(ifp, icur, &right)) {
state |= BMAP_RIGHT_VALID;
if (isnullstartblock(right.br_startblock))
state |= BMAP_RIGHT_DELAY;
}
/*
* We're inserting a real allocation between "left" and "right".
* Set the contiguity flags. Don't let extents get too large.
*/
if ((state & BMAP_LEFT_VALID) && !(state & BMAP_LEFT_DELAY) &&
left.br_startoff + left.br_blockcount == new->br_startoff &&
left.br_startblock + left.br_blockcount == new->br_startblock &&
left.br_state == new->br_state &&
left.br_blockcount + new->br_blockcount <= XFS_MAX_BMBT_EXTLEN)
state |= BMAP_LEFT_CONTIG;
if ((state & BMAP_RIGHT_VALID) && !(state & BMAP_RIGHT_DELAY) &&
new->br_startoff + new->br_blockcount == right.br_startoff &&
new->br_startblock + new->br_blockcount == right.br_startblock &&
new->br_state == right.br_state &&
new->br_blockcount + right.br_blockcount <= XFS_MAX_BMBT_EXTLEN &&
(!(state & BMAP_LEFT_CONTIG) ||
left.br_blockcount + new->br_blockcount +
right.br_blockcount <= XFS_MAX_BMBT_EXTLEN))
state |= BMAP_RIGHT_CONTIG;
error = 0;
/*
* Select which case we're in here, and implement it.
*/
switch (state & (BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG)) {
case BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
/*
* New allocation is contiguous with real allocations on the
* left and on the right.
* Merge all three into a single extent record.
*/
left.br_blockcount += new->br_blockcount + right.br_blockcount;
xfs_iext_remove(ip, icur, state);
xfs_iext_prev(ifp, icur);
xfs_iext_update_extent(ip, state, icur, &left);
ifp->if_nextents--;
if (cur == NULL) {
rval = XFS_ILOG_CORE | xfs_ilog_fext(whichfork);
} else {
rval = XFS_ILOG_CORE;
error = xfs_bmbt_lookup_eq(cur, &right, &i);
if (error)
goto done;
if (XFS_IS_CORRUPT(mp, i != 1)) {
error = -EFSCORRUPTED;
goto done;
}
error = xfs_btree_delete(cur, &i);
if (error)
goto done;
if (XFS_IS_CORRUPT(mp, i != 1)) {
error = -EFSCORRUPTED;
goto done;
}
error = xfs_btree_decrement(cur, 0, &i);
if (error)
goto done;
if (XFS_IS_CORRUPT(mp, i != 1)) {
error = -EFSCORRUPTED;
goto done;
}
error = xfs_bmbt_update(cur, &left);
if (error)
goto done;
}
break;
case BMAP_LEFT_CONTIG:
/*
* New allocation is contiguous with a real allocation
* on the left.
* Merge the new allocation with the left neighbor.
*/
old = left;
left.br_blockcount += new->br_blockcount;
xfs_iext_prev(ifp, icur);
xfs_iext_update_extent(ip, state, icur, &left);
if (cur == NULL) {
rval = xfs_ilog_fext(whichfork);
} else {
rval = 0;
error = xfs_bmbt_lookup_eq(cur, &old, &i);
if (error)
goto done;
if (XFS_IS_CORRUPT(mp, i != 1)) {
error = -EFSCORRUPTED;
goto done;
}
error = xfs_bmbt_update(cur, &left);
if (error)
goto done;
}
break;
case BMAP_RIGHT_CONTIG:
/*
* New allocation is contiguous with a real allocation
* on the right.
* Merge the new allocation with the right neighbor.
*/
old = right;
right.br_startoff = new->br_startoff;
right.br_startblock = new->br_startblock;
right.br_blockcount += new->br_blockcount;
xfs_iext_update_extent(ip, state, icur, &right);
if (cur == NULL) {
rval = xfs_ilog_fext(whichfork);
} else {
rval = 0;
error = xfs_bmbt_lookup_eq(cur, &old, &i);
if (error)
goto done;
if (XFS_IS_CORRUPT(mp, i != 1)) {
error = -EFSCORRUPTED;
goto done;
}
error = xfs_bmbt_update(cur, &right);
if (error)
goto done;
}
break;
case 0:
/*
* New allocation is not contiguous with another
* real allocation.
* Insert a new entry.
*/
xfs_iext_insert(ip, icur, new, state);
ifp->if_nextents++;
if (cur == NULL) {
rval = XFS_ILOG_CORE | xfs_ilog_fext(whichfork);
} else {
rval = XFS_ILOG_CORE;
error = xfs_bmbt_lookup_eq(cur, new, &i);
if (error)
goto done;
if (XFS_IS_CORRUPT(mp, i != 0)) {
error = -EFSCORRUPTED;
goto done;
}
error = xfs_btree_insert(cur, &i);
if (error)
goto done;
if (XFS_IS_CORRUPT(mp, i != 1)) {
error = -EFSCORRUPTED;
goto done;
}
}
break;
}
/* add reverse mapping unless caller opted out */
if (!(flags & XFS_BMAPI_NORMAP))
xfs_rmap_map_extent(tp, ip, whichfork, new);
/* convert to a btree if necessary */
if (xfs_bmap_needs_btree(ip, whichfork)) {
int tmp_logflags; /* partial log flag return val */
ASSERT(cur == NULL);
error = xfs_bmap_extents_to_btree(tp, ip, curp, 0,
&tmp_logflags, whichfork);
*logflagsp |= tmp_logflags;
cur = *curp;
if (error)
goto done;
}
/* clear out the allocated field, done with it now in any case. */
if (cur)
cur->bc_ino.allocated = 0;
xfs_bmap_check_leaf_extents(cur, ip, whichfork);
done:
*logflagsp |= rval;
return error;
}
/*
* Functions used in the extent read, allocate and remove paths
*/
/*
* Adjust the size of the new extent based on i_extsize and rt extsize.
*/
int
xfs_bmap_extsize_align(
xfs_mount_t *mp,
xfs_bmbt_irec_t *gotp, /* next extent pointer */
xfs_bmbt_irec_t *prevp, /* previous extent pointer */
xfs_extlen_t extsz, /* align to this extent size */
int rt, /* is this a realtime inode? */
int eof, /* is extent at end-of-file? */
int delay, /* creating delalloc extent? */
int convert, /* overwriting unwritten extent? */
xfs_fileoff_t *offp, /* in/out: aligned offset */
xfs_extlen_t *lenp) /* in/out: aligned length */
{
xfs_fileoff_t orig_off; /* original offset */
xfs_extlen_t orig_alen; /* original length */
xfs_fileoff_t orig_end; /* original off+len */
xfs_fileoff_t nexto; /* next file offset */
xfs_fileoff_t prevo; /* previous file offset */
xfs_fileoff_t align_off; /* temp for offset */
xfs_extlen_t align_alen; /* temp for length */
xfs_extlen_t temp; /* temp for calculations */
if (convert)
return 0;
orig_off = align_off = *offp;
orig_alen = align_alen = *lenp;
orig_end = orig_off + orig_alen;
/*
* If this request overlaps an existing extent, then don't
* attempt to perform any additional alignment.
*/
if (!delay && !eof &&
(orig_off >= gotp->br_startoff) &&
(orig_end <= gotp->br_startoff + gotp->br_blockcount)) {
return 0;
}
/*
* If the file offset is unaligned vs. the extent size
* we need to align it. This will be possible unless
* the file was previously written with a kernel that didn't
* perform this alignment, or if a truncate shot us in the
* foot.
*/
div_u64_rem(orig_off, extsz, &temp);
if (temp) {
align_alen += temp;
align_off -= temp;
}
/* Same adjustment for the end of the requested area. */
temp = (align_alen % extsz);
if (temp)
align_alen += extsz - temp;
/*
* For large extent hint sizes, the aligned extent might be larger than
* XFS_BMBT_MAX_EXTLEN. In that case, reduce the size by an extsz so
* that it pulls the length back under XFS_BMBT_MAX_EXTLEN. The outer
* allocation loops handle short allocation just fine, so it is safe to
* do this. We only want to do it when we are forced to, though, because
* it means more allocation operations are required.
*/
while (align_alen > XFS_MAX_BMBT_EXTLEN)
align_alen -= extsz;
ASSERT(align_alen <= XFS_MAX_BMBT_EXTLEN);
/*
* If the previous block overlaps with this proposed allocation
* then move the start forward without adjusting the length.
*/
if (prevp->br_startoff != NULLFILEOFF) {
if (prevp->br_startblock == HOLESTARTBLOCK)
prevo = prevp->br_startoff;
else
prevo = prevp->br_startoff + prevp->br_blockcount;
} else
prevo = 0;
if (align_off != orig_off && align_off < prevo)
align_off = prevo;
/*
* If the next block overlaps with this proposed allocation
* then move the start back without adjusting the length,
* but not before offset 0.
* This may of course make the start overlap previous block,
* and if we hit the offset 0 limit then the next block
* can still overlap too.
*/
if (!eof && gotp->br_startoff != NULLFILEOFF) {
if ((delay && gotp->br_startblock == HOLESTARTBLOCK) ||
(!delay && gotp->br_startblock == DELAYSTARTBLOCK))
nexto = gotp->br_startoff + gotp->br_blockcount;
else
nexto = gotp->br_startoff;
} else
nexto = NULLFILEOFF;
if (!eof &&
align_off + align_alen != orig_end &&
align_off + align_alen > nexto)
align_off = nexto > align_alen ? nexto - align_alen : 0;
/*
* If we're now overlapping the next or previous extent that
* means we can't fit an extsz piece in this hole. Just move
* the start forward to the first valid spot and set
* the length so we hit the end.
*/
if (align_off != orig_off && align_off < prevo)
align_off = prevo;
if (align_off + align_alen != orig_end &&
align_off + align_alen > nexto &&
nexto != NULLFILEOFF) {
ASSERT(nexto > prevo);
align_alen = nexto - align_off;
}
/*
* If realtime, and the result isn't a multiple of the realtime
* extent size we need to remove blocks until it is.
*/
if (rt && (temp = (align_alen % mp->m_sb.sb_rextsize))) {
/*
* We're not covering the original request, or
* we won't be able to once we fix the length.
*/
if (orig_off < align_off ||
orig_end > align_off + align_alen ||
align_alen - temp < orig_alen)
return -EINVAL;
/*
* Try to fix it by moving the start up.
*/
if (align_off + temp <= orig_off) {
align_alen -= temp;
align_off += temp;
}
/*
* Try to fix it by moving the end in.
*/
else if (align_off + align_alen - temp >= orig_end)
align_alen -= temp;
/*
* Set the start to the minimum then trim the length.
*/
else {
align_alen -= orig_off - align_off;
align_off = orig_off;
align_alen -= align_alen % mp->m_sb.sb_rextsize;
}
/*
* Result doesn't cover the request, fail it.
*/
if (orig_off < align_off || orig_end > align_off + align_alen)
return -EINVAL;
} else {
ASSERT(orig_off >= align_off);
/* see XFS_BMBT_MAX_EXTLEN handling above */
ASSERT(orig_end <= align_off + align_alen ||
align_alen + extsz > XFS_MAX_BMBT_EXTLEN);
}
#ifdef DEBUG
if (!eof && gotp->br_startoff != NULLFILEOFF)
ASSERT(align_off + align_alen <= gotp->br_startoff);
if (prevp->br_startoff != NULLFILEOFF)
ASSERT(align_off >= prevp->br_startoff + prevp->br_blockcount);
#endif
*lenp = align_alen;
*offp = align_off;
return 0;
}
#define XFS_ALLOC_GAP_UNITS 4
void
xfs_bmap_adjacent(
struct xfs_bmalloca *ap) /* bmap alloc argument struct */
{
xfs_fsblock_t adjust; /* adjustment to block numbers */
xfs_mount_t *mp; /* mount point structure */
int rt; /* true if inode is realtime */
#define ISVALID(x,y) \
(rt ? \
(x) < mp->m_sb.sb_rblocks : \
XFS_FSB_TO_AGNO(mp, x) == XFS_FSB_TO_AGNO(mp, y) && \
XFS_FSB_TO_AGNO(mp, x) < mp->m_sb.sb_agcount && \
XFS_FSB_TO_AGBNO(mp, x) < mp->m_sb.sb_agblocks)
mp = ap->ip->i_mount;
rt = XFS_IS_REALTIME_INODE(ap->ip) &&
(ap->datatype & XFS_ALLOC_USERDATA);
/*
* If allocating at eof, and there's a previous real block,