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xfs_bmap.c
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/*
* Copyright (c) 2000-2006 Silicon Graphics, Inc.
* All Rights Reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it would be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "xfs.h"
#include "xfs_fs.h"
#include "xfs_format.h"
#include "xfs_bit.h"
#include "xfs_log.h"
#include "xfs_inum.h"
#include "xfs_trans.h"
#include "xfs_sb.h"
#include "xfs_ag.h"
#include "xfs_mount.h"
#include "xfs_da_btree.h"
#include "xfs_dir2_format.h"
#include "xfs_dir2.h"
#include "xfs_bmap_btree.h"
#include "xfs_alloc_btree.h"
#include "xfs_ialloc_btree.h"
#include "xfs_dinode.h"
#include "xfs_inode.h"
#include "xfs_btree.h"
#include "xfs_mount.h"
#include "xfs_itable.h"
#include "xfs_inode_item.h"
#include "xfs_extfree_item.h"
#include "xfs_alloc.h"
#include "xfs_bmap.h"
#include "xfs_bmap_util.h"
#include "xfs_rtalloc.h"
#include "xfs_error.h"
#include "xfs_attr_leaf.h"
#include "xfs_quota.h"
#include "xfs_trans_space.h"
#include "xfs_buf_item.h"
#include "xfs_filestream.h"
#include "xfs_trace.h"
#include "xfs_symlink.h"
kmem_zone_t *xfs_bmap_free_item_zone;
/*
* 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 */
{
int level; /* btree level */
uint maxblocks; /* max blocks at this level */
uint maxleafents; /* max leaf entries possible */
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 file, hence the maximum
* number of leaf entries, is controlled by the type of di_nextents
* (a signed 32-bit number, xfs_extnum_t), or by di_anextents
* (a signed 16-bit number, xfs_aextnum_t).
*
* 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
* di_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.
*/
if (whichfork == XFS_DATA_FORK) {
maxleafents = MAXEXTNUM;
sz = XFS_BMDR_SPACE_CALC(MINDBTPTRS);
} else {
maxleafents = MAXAEXTNUM;
sz = XFS_BMDR_SPACE_CALC(MINABTPTRS);
}
maxrootrecs = xfs_bmdr_maxrecs(mp, sz, 0);
minleafrecs = mp->m_bmap_dmnr[0];
minnoderecs = mp->m_bmap_dmnr[1];
maxblocks = (maxleafents + minleafrecs - 1) / minleafrecs;
for (level = 1; maxblocks > 1; level++) {
if (maxblocks <= maxrootrecs)
maxblocks = 1;
else
maxblocks = (maxblocks + minnoderecs - 1) / minnoderecs;
}
mp->m_bm_maxlevels[whichfork] = level;
}
STATIC int /* error */
xfs_bmbt_lookup_eq(
struct xfs_btree_cur *cur,
xfs_fileoff_t off,
xfs_fsblock_t bno,
xfs_filblks_t len,
int *stat) /* success/failure */
{
cur->bc_rec.b.br_startoff = off;
cur->bc_rec.b.br_startblock = bno;
cur->bc_rec.b.br_blockcount = len;
return xfs_btree_lookup(cur, XFS_LOOKUP_EQ, stat);
}
STATIC int /* error */
xfs_bmbt_lookup_ge(
struct xfs_btree_cur *cur,
xfs_fileoff_t off,
xfs_fsblock_t bno,
xfs_filblks_t len,
int *stat) /* success/failure */
{
cur->bc_rec.b.br_startoff = off;
cur->bc_rec.b.br_startblock = bno;
cur->bc_rec.b.br_blockcount = len;
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)
{
return XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS &&
XFS_IFORK_NEXTENTS(ip, whichfork) >
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)
{
return XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE &&
XFS_IFORK_NEXTENTS(ip, whichfork) <=
XFS_IFORK_MAXEXT(ip, whichfork);
}
/*
* Update the record referred to by cur to the value given
* by [off, bno, len, state].
* This either works (return 0) or gets an EFSCORRUPTED error.
*/
STATIC int
xfs_bmbt_update(
struct xfs_btree_cur *cur,
xfs_fileoff_t off,
xfs_fsblock_t bno,
xfs_filblks_t len,
xfs_exntst_t state)
{
union xfs_btree_rec rec;
xfs_bmbt_disk_set_allf(&rec.bmbt, off, bno, len, state);
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)
{
struct xfs_mount *mp = ip->i_mount;
uint offset;
if (mp->m_sb.sb_inodesize == 256) {
offset = XFS_LITINO(mp, ip->i_d.di_version) -
XFS_BMDR_SPACE_CALC(MINABTPTRS);
} else {
offset = XFS_BMDR_SPACE_CALC(6 * MINABTPTRS);
}
ASSERT(offset < XFS_LITINO(mp, ip->i_d.di_version));
return offset;
}
/*
* Helper routine to reset inode di_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_mount_t *mp,
xfs_inode_t *ip,
int whichfork)
{
if (whichfork == XFS_ATTR_FORK &&
ip->i_d.di_format != XFS_DINODE_FMT_DEV &&
ip->i_d.di_format != XFS_DINODE_FMT_UUID &&
ip->i_d.di_format != XFS_DINODE_FMT_BTREE) {
uint dfl_forkoff = xfs_default_attroffset(ip) >> 3;
if (dfl_forkoff > ip->i_d.di_forkoff)
ip->i_d.di_forkoff = dfl_forkoff;
}
}
/*
* Debug/sanity checking code
*/
STATIC int
xfs_bmap_sanity_check(
struct xfs_mount *mp,
struct xfs_buf *bp,
int level)
{
struct xfs_btree_block *block = XFS_BUF_TO_BLOCK(bp);
if (block->bb_magic != cpu_to_be32(XFS_BMAP_CRC_MAGIC) &&
block->bb_magic != cpu_to_be32(XFS_BMAP_MAGIC))
return 0;
if (be16_to_cpu(block->bb_level) != level ||
be16_to_cpu(block->bb_numrecs) == 0 ||
be16_to_cpu(block->bb_numrecs) > mp->m_bmap_dmxr[level != 0])
return 0;
return 1;
}
#ifdef DEBUG
STATIC struct xfs_buf *
xfs_bmap_get_bp(
struct xfs_btree_cur *cur,
xfs_fsblock_t bno)
{
struct xfs_log_item_desc *lidp;
int i;
if (!cur)
return NULL;
for (i = 0; i < XFS_BTREE_MAXLEVELS; i++) {
if (!cur->bc_bufs[i])
break;
if (XFS_BUF_ADDR(cur->bc_bufs[i]) == bno)
return cur->bc_bufs[i];
}
/* Chase down all the log items to see if the bp is there */
list_for_each_entry(lidp, &cur->bc_tp->t_items, lid_trans) {
struct xfs_buf_log_item *bip;
bip = (struct xfs_buf_log_item *)lidp->lid_item;
if (bip->bli_item.li_type == XFS_LI_BUF &&
XFS_BUF_ADDR(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) %Ld",
__func__, j, i,
(unsigned long long)be64_to_cpu(*thispa));
panic("%s: ptrs are equal in node\n",
__func__);
}
}
}
}
/*
* Check that the extents for the inode ip are in the right order in all
* btree leaves.
*/
STATIC void
xfs_bmap_check_leaf_extents(
xfs_btree_cur_t *cur, /* btree cursor or null */
xfs_inode_t *ip, /* incore inode pointer */
int whichfork) /* data or attr fork */
{
struct xfs_btree_block *block; /* current btree block */
xfs_fsblock_t bno; /* block # of "block" */
xfs_buf_t *bp; /* buffer for "block" */
int error; /* error return value */
xfs_extnum_t i=0, j; /* index into the extents list */
xfs_ifork_t *ifp; /* fork structure */
int level; /* btree level, for checking */
xfs_mount_t *mp; /* file system mount structure */
__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 (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE) {
return;
}
bno = NULLFSBLOCK;
mp = ip->i_mount;
ifp = XFS_IFORK_PTR(ip, whichfork);
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 != NULLDFSBNO);
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, 0, &bp,
XFS_BMAP_BTREE_REF,
&xfs_bmbt_buf_ops);
if (error)
goto error_norelse;
}
block = XFS_BUF_TO_BLOCK(bp);
XFS_WANT_CORRUPTED_GOTO(
xfs_bmap_sanity_check(mp, bp, level),
error0);
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);
XFS_WANT_CORRUPTED_GOTO(XFS_FSB_SANITY_CHECK(mp, bno), 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, 0, &bp,
XFS_BMAP_BTREE_REF,
&xfs_bmbt_buf_ops);
if (error)
goto error_norelse;
}
block = XFS_BUF_TO_BLOCK(bp);
}
if (bp_release) {
bp_release = 0;
xfs_trans_brelse(NULL, 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 %d extents",
__func__, i);
panic("%s: CORRUPTED BTREE OR SOMETHING", __func__);
return;
}
/*
* Add bmap trace insert entries for all the contents of the extent records.
*/
void
xfs_bmap_trace_exlist(
xfs_inode_t *ip, /* incore inode pointer */
xfs_extnum_t cnt, /* count of entries in the list */
int whichfork, /* data or attr fork */
unsigned long caller_ip)
{
xfs_extnum_t idx; /* extent record index */
xfs_ifork_t *ifp; /* inode fork pointer */
int state = 0;
if (whichfork == XFS_ATTR_FORK)
state |= BMAP_ATTRFORK;
ifp = XFS_IFORK_PTR(ip, whichfork);
ASSERT(cnt == (ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t)));
for (idx = 0; idx < cnt; idx++)
trace_xfs_extlist(ip, idx, whichfork, caller_ip);
}
/*
* 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,
int 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)
#endif /* DEBUG */
/*
* bmap free list manipulation functions
*/
/*
* Add the extent to the list of extents to be free at transaction end.
* The list is maintained sorted (by block number).
*/
void
xfs_bmap_add_free(
xfs_fsblock_t bno, /* fs block number of extent */
xfs_filblks_t len, /* length of extent */
xfs_bmap_free_t *flist, /* list of extents */
xfs_mount_t *mp) /* mount point structure */
{
xfs_bmap_free_item_t *cur; /* current (next) element */
xfs_bmap_free_item_t *new; /* new element */
xfs_bmap_free_item_t *prev; /* previous element */
#ifdef DEBUG
xfs_agnumber_t agno;
xfs_agblock_t agbno;
ASSERT(bno != NULLFSBLOCK);
ASSERT(len > 0);
ASSERT(len <= MAXEXTLEN);
ASSERT(!isnullstartblock(bno));
agno = XFS_FSB_TO_AGNO(mp, bno);
agbno = XFS_FSB_TO_AGBNO(mp, bno);
ASSERT(agno < mp->m_sb.sb_agcount);
ASSERT(agbno < mp->m_sb.sb_agblocks);
ASSERT(len < mp->m_sb.sb_agblocks);
ASSERT(agbno + len <= mp->m_sb.sb_agblocks);
#endif
ASSERT(xfs_bmap_free_item_zone != NULL);
new = kmem_zone_alloc(xfs_bmap_free_item_zone, KM_SLEEP);
new->xbfi_startblock = bno;
new->xbfi_blockcount = (xfs_extlen_t)len;
for (prev = NULL, cur = flist->xbf_first;
cur != NULL;
prev = cur, cur = cur->xbfi_next) {
if (cur->xbfi_startblock >= bno)
break;
}
if (prev)
prev->xbfi_next = new;
else
flist->xbf_first = new;
new->xbfi_next = cur;
flist->xbf_count++;
}
/*
* Remove the entry "free" from the free item list. Prev points to the
* previous entry, unless "free" is the head of the list.
*/
void
xfs_bmap_del_free(
xfs_bmap_free_t *flist, /* free item list header */
xfs_bmap_free_item_t *prev, /* previous item on list, if any */
xfs_bmap_free_item_t *free) /* list item to be freed */
{
if (prev)
prev->xbfi_next = free->xbfi_next;
else
flist->xbf_first = free->xbfi_next;
flist->xbf_count--;
kmem_zone_free(xfs_bmap_free_item_zone, free);
}
/*
* Free up any items left in the list.
*/
void
xfs_bmap_cancel(
xfs_bmap_free_t *flist) /* list of bmap_free_items */
{
xfs_bmap_free_item_t *free; /* free list item */
xfs_bmap_free_item_t *next;
if (flist->xbf_count == 0)
return;
ASSERT(flist->xbf_first != NULL);
for (free = flist->xbf_first; free; free = next) {
next = free->xbfi_next;
xfs_bmap_del_free(flist, NULL, free);
}
ASSERT(flist->xbf_count == 0);
}
/*
* Inode fork format manipulation functions
*/
/*
* Transform a btree format file with only one leaf node, where the
* extents list will fit in the inode, into an extents format file.
* Since the file 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(
xfs_trans_t *tp, /* transaction pointer */
xfs_inode_t *ip, /* incore inode pointer */
xfs_btree_cur_t *cur, /* btree cursor */
int *logflagsp, /* inode logging flags */
int whichfork) /* data or attr fork */
{
/* REFERENCED */
struct xfs_btree_block *cblock;/* child btree block */
xfs_fsblock_t cbno; /* child block number */
xfs_buf_t *cbp; /* child block's buffer */
int error; /* error return value */
xfs_ifork_t *ifp; /* inode fork data */
xfs_mount_t *mp; /* mount point structure */
__be64 *pp; /* ptr to block address */
struct xfs_btree_block *rblock;/* root btree block */
mp = ip->i_mount;
ifp = XFS_IFORK_PTR(ip, whichfork);
ASSERT(ifp->if_flags & XFS_IFEXTENTS);
ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE);
rblock = ifp->if_broot;
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);
*logflagsp = 0;
#ifdef DEBUG
if ((error = xfs_btree_check_lptr(cur, cbno, 1)))
return error;
#endif
error = xfs_btree_read_bufl(mp, tp, cbno, 0, &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_bmap_add_free(cbno, 1, cur->bc_private.b.flist, mp);
ip->i_d.di_nblocks--;
xfs_trans_mod_dquot_byino(tp, ip, XFS_TRANS_DQ_BCOUNT, -1L);
xfs_trans_binval(tp, cbp);
if (cur->bc_bufs[0] == cbp)
cur->bc_bufs[0] = NULL;
xfs_iroot_realloc(ip, -1, whichfork);
ASSERT(ifp->if_broot == NULL);
ASSERT((ifp->if_flags & XFS_IFBROOT) == 0);
XFS_IFORK_FMT_SET(ip, whichfork, 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(
xfs_trans_t *tp, /* transaction pointer */
xfs_inode_t *ip, /* incore inode pointer */
xfs_fsblock_t *firstblock, /* first-block-allocated */
xfs_bmap_free_t *flist, /* blocks freed in xaction */
xfs_btree_cur_t **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 */
xfs_buf_t *abp; /* buffer for ablock */
xfs_alloc_arg_t args; /* allocation arguments */
xfs_bmbt_rec_t *arp; /* child record pointer */
struct xfs_btree_block *block; /* btree root block */
xfs_btree_cur_t *cur; /* bmap btree cursor */
xfs_bmbt_rec_host_t *ep; /* extent record pointer */
int error; /* error return value */
xfs_extnum_t i, cnt; /* extent record index */
xfs_ifork_t *ifp; /* inode fork pointer */
xfs_bmbt_key_t *kp; /* root block key pointer */
xfs_mount_t *mp; /* mount structure */
xfs_extnum_t nextents; /* number of file extents */
xfs_bmbt_ptr_t *pp; /* root block address pointer */
mp = ip->i_mount;
ifp = XFS_IFORK_PTR(ip, whichfork);
ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS);
/*
* Make space in the inode incore.
*/
xfs_iroot_realloc(ip, 1, whichfork);
ifp->if_flags |= XFS_IFBROOT;
/*
* Fill in the root.
*/
block = ifp->if_broot;
if (xfs_sb_version_hascrc(&mp->m_sb))
xfs_btree_init_block_int(mp, block, XFS_BUF_DADDR_NULL,
XFS_BMAP_CRC_MAGIC, 1, 1, ip->i_ino,
XFS_BTREE_LONG_PTRS | XFS_BTREE_CRC_BLOCKS);
else
xfs_btree_init_block_int(mp, block, XFS_BUF_DADDR_NULL,
XFS_BMAP_MAGIC, 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_private.b.firstblock = *firstblock;
cur->bc_private.b.flist = flist;
cur->bc_private.b.flags = wasdel ? XFS_BTCUR_BPRV_WASDEL : 0;
/*
* Convert to a btree with two levels, one record in root.
*/
XFS_IFORK_FMT_SET(ip, whichfork, XFS_DINODE_FMT_BTREE);
memset(&args, 0, sizeof(args));
args.tp = tp;
args.mp = mp;
args.firstblock = *firstblock;
if (*firstblock == NULLFSBLOCK) {
args.type = XFS_ALLOCTYPE_START_BNO;
args.fsbno = XFS_INO_TO_FSB(mp, ip->i_ino);
} else if (flist->xbf_low) {
args.type = XFS_ALLOCTYPE_START_BNO;
args.fsbno = *firstblock;
} else {
args.type = XFS_ALLOCTYPE_NEAR_BNO;
args.fsbno = *firstblock;
}
args.minlen = args.maxlen = args.prod = 1;
args.wasdel = wasdel;
*logflagsp = 0;
if ((error = xfs_alloc_vextent(&args))) {
xfs_iroot_realloc(ip, -1, whichfork);
xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
return error;
}
/*
* Allocation can't fail, the space was reserved.
*/
ASSERT(args.fsbno != NULLFSBLOCK);
ASSERT(*firstblock == NULLFSBLOCK ||
args.agno == XFS_FSB_TO_AGNO(mp, *firstblock) ||
(flist->xbf_low &&
args.agno > XFS_FSB_TO_AGNO(mp, *firstblock)));
*firstblock = cur->bc_private.b.firstblock = args.fsbno;
cur->bc_private.b.allocated++;
ip->i_d.di_nblocks++;
xfs_trans_mod_dquot_byino(tp, ip, XFS_TRANS_DQ_BCOUNT, 1L);
abp = xfs_btree_get_bufl(mp, tp, args.fsbno, 0);
/*
* Fill in the child block.
*/
abp->b_ops = &xfs_bmbt_buf_ops;
ablock = XFS_BUF_TO_BLOCK(abp);
if (xfs_sb_version_hascrc(&mp->m_sb))
xfs_btree_init_block_int(mp, ablock, abp->b_bn,
XFS_BMAP_CRC_MAGIC, 0, 0, ip->i_ino,
XFS_BTREE_LONG_PTRS | XFS_BTREE_CRC_BLOCKS);
else
xfs_btree_init_block_int(mp, ablock, abp->b_bn,
XFS_BMAP_MAGIC, 0, 0, ip->i_ino,
XFS_BTREE_LONG_PTRS);
arp = XFS_BMBT_REC_ADDR(mp, ablock, 1);
nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
for (cnt = i = 0; i < nextents; i++) {
ep = xfs_iext_get_ext(ifp, i);
if (!isnullstartblock(xfs_bmbt_get_startblock(ep))) {
arp->l0 = cpu_to_be64(ep->l0);
arp->l1 = cpu_to_be64(ep->l1);
arp++; cnt++;
}
}
ASSERT(cnt == XFS_IFORK_NEXTENTS(ip, whichfork));
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;
}
/*
* 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_inode *ip,
int whichfork)
{
struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork);
ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL);
ASSERT(ifp->if_bytes == 0);
ASSERT(XFS_IFORK_NEXTENTS(ip, whichfork) == 0);
xfs_bmap_forkoff_reset(ip->i_mount, ip, whichfork);
ifp->if_flags &= ~XFS_IFINLINE;
ifp->if_flags |= XFS_IFEXTENTS;
XFS_IFORK_FMT_SET(ip, whichfork, XFS_DINODE_FMT_EXTENTS);
}
STATIC int /* error */
xfs_bmap_local_to_extents(
xfs_trans_t *tp, /* transaction pointer */
xfs_inode_t *ip, /* incore inode pointer */
xfs_fsblock_t *firstblock, /* first block allocated in xaction */
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 */
xfs_ifork_t *ifp; /* inode fork pointer */
xfs_alloc_arg_t args; /* allocation arguments */
xfs_buf_t *bp; /* buffer for extent block */
xfs_bmbt_rec_host_t *ep; /* extent record pointer */
/*
* 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(ip->i_d.di_mode) && whichfork == XFS_DATA_FORK));
ifp = XFS_IFORK_PTR(ip, whichfork);
ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL);
if (!ifp->if_bytes) {
xfs_bmap_local_to_extents_empty(ip, whichfork);
flags = XFS_ILOG_CORE;
goto done;
}
flags = 0;
error = 0;
ASSERT((ifp->if_flags & (XFS_IFINLINE|XFS_IFEXTENTS|XFS_IFEXTIREC)) ==
XFS_IFINLINE);
memset(&args, 0, sizeof(args));
args.tp = tp;
args.mp = ip->i_mount;
args.firstblock = *firstblock;
/*
* Allocate a block. We know we need only one, since the
* file currently fits in an inode.
*/
if (*firstblock == NULLFSBLOCK) {
args.fsbno = XFS_INO_TO_FSB(args.mp, ip->i_ino);
args.type = XFS_ALLOCTYPE_START_BNO;
} else {
args.fsbno = *firstblock;
args.type = XFS_ALLOCTYPE_NEAR_BNO;
}
args.total = total;
args.minlen = args.maxlen = args.prod = 1;
error = xfs_alloc_vextent(&args);
if (error)
goto done;
/* Can't fail, the space was reserved. */
ASSERT(args.fsbno != NULLFSBLOCK);
ASSERT(args.len == 1);
*firstblock = args.fsbno;
bp = xfs_btree_get_bufl(args.mp, tp, args.fsbno, 0);
/* initialise the block and copy the data */
init_fn(tp, bp, ip, ifp);
/* account for the change in fork size and log everything */
xfs_trans_log_buf(tp, bp, 0, ifp->if_bytes - 1);
xfs_idata_realloc(ip, -ifp->if_bytes, whichfork);
xfs_bmap_local_to_extents_empty(ip, whichfork);
flags |= XFS_ILOG_CORE;
xfs_iext_add(ifp, 0, 1);
ep = xfs_iext_get_ext(ifp, 0);
xfs_bmbt_set_allf(ep, 0, args.fsbno, 1, XFS_EXT_NORM);
trace_xfs_bmap_post_update(ip, 0,
whichfork == XFS_ATTR_FORK ? BMAP_ATTRFORK : 0,
_THIS_IP_);
XFS_IFORK_NEXT_SET(ip, whichfork, 1);
ip->i_d.di_nblocks = 1;
xfs_trans_mod_dquot_byino(tp, ip,
XFS_TRANS_DQ_BCOUNT, 1L);