leandrof/linux
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

[XFS] 929045 567344 This mod re-organizes some of the in-core file extent

Browse Source 
code to prepare for an upcoming mod which will introduce multi-level
in-core extent allocations. Although the in-core extent management is
using a new code path in this mod, the functionality remains the same. 
Major changes include:	- Introduce 10 new subroutines which re-orgainze
the existing code but	do NOT change functionality:	    
xfs_iext_get_ext()	   xfs_iext_insert()	     xfs_iext_add()	  
 xfs_iext_remove()	   xfs_iext_remove_inline()	   
xfs_iext_remove_direct()	 xfs_iext_realloc_direct()	  
xfs_iext_direct_to_inline()	    xfs_iext_inline_to_direct()        
xfs_iext_destroy() - Remove 2 subroutines (functionality moved to new
subroutines above):	    xfs_iext_realloc() -replaced by xfs_iext_add()
and xfs_iext_remove()	      xfs_bmap_insert_exlist() - replaced by
xfs_iext_insert()	  xfs_bmap_delete_exlist() - replaced by
xfs_iext_remove() - Replace all hard-coded (indexed) extent assignments
with a call to	 xfs_iext_get_ext() - Replace all extent record pointer
arithmetic (ep++, ep--, base + lastx,..)   with calls to
xfs_iext_get_ext() - Update comments to remove the idea of a single
"extent list" and   introduce "extent record" terminology instead

SGI-PV: 928864
SGI-Modid: xfs-linux-melb:xfs-kern:207390a

Signed-off-by: Mandy Kirkconnell <alkirkco@sgi.com>
Signed-off-by: Nathan Scott <nathans@sgi.com>
This commit is contained in:
Mandy Kirkconnell 2006-03-14 13:29:52 +11:00 committed by Nathan Scott
parent 9f989c9455
commit 4eea22f01b
6 changed files with 597 additions and 410 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
fs/xfs/quota/xfs_qm.c
View File

@ -1704,9 +1704,9 @@ xfs_qm_get_rtblks(
xfs_qcnt_t *O_rtblks)
{
xfs_filblks_t rtblks; /* total rt blks */
xfs_extnum_t idx; /* extent record index */
xfs_ifork_t *ifp; /* inode fork pointer */
xfs_extnum_t nextents; /* number of extent entries */
xfs_bmbt_rec_t *base; /* base of extent array */
xfs_bmbt_rec_t *ep; /* pointer to an extent entry */
int error;
@ -1717,10 +1717,11 @@ xfs_qm_get_rtblks(
return error;
}
rtblks = 0;
nextents = ifp->if_bytes / sizeof(xfs_bmbt_rec_t);
base = &ifp->if_u1.if_extents[0];
for (ep = base; ep < &base[nextents]; ep++)
nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
for (idx = 0; idx < nextents; idx++) {
ep = xfs_iext_get_ext(ifp, idx);
rtblks += xfs_bmbt_get_blockcount(ep);
}
*O_rtblks = (xfs_qcnt_t)rtblks;
return 0;
}

496
fs/xfs/xfs_bmap.c
View File

File diff suppressed because it is too large Load Diff

4
fs/xfs/xfs_bmap.h
View File

@ -20,6 +20,7 @@
struct getbmap;
struct xfs_bmbt_irec;
struct xfs_ifork;
struct xfs_inode;
struct xfs_mount;
struct xfs_trans;
@ -347,7 +348,8 @@ xfs_bmap_count_blocks(
*/
int
xfs_check_nostate_extents(
xfs_bmbt_rec_t *ep,
struct xfs_ifork *ifp,
xfs_extnum_t idx,
xfs_extnum_t num);
#endif /* __KERNEL__ */

10
fs/xfs/xfs_bmap_btree.c
View File

@ -2754,7 +2754,7 @@ xfs_bmbt_update(
}
/*
* Check an extent list, which has just been read, for
* Check extent records, which have just been read, for
* any bit in the extent flag field. ASSERT on debug
* kernels, as this condition should not occur.
* Return an error condition (1) if any flags found,
@ -2763,10 +2763,14 @@ xfs_bmbt_update(
int
xfs_check_nostate_extents(
xfs_bmbt_rec_t *ep,
xfs_ifork_t *ifp,
xfs_extnum_t idx,
xfs_extnum_t num)
{
for (; num > 0; num--, ep++) {
xfs_bmbt_rec_t *ep;
for (; num > 0; num--, idx++) {
ep = xfs_iext_get_ext(ifp, idx);
if ((ep->l0 >>
(64 - BMBT_EXNTFLAG_BITLEN)) != 0) {
ASSERT(0);

470
fs/xfs/xfs_inode.c
View File

@ -76,16 +76,18 @@ STATIC int xfs_iformat_btree(xfs_inode_t *, xfs_dinode_t *, int);
*/
STATIC void
xfs_validate_extents(
xfs_bmbt_rec_t *ep,
xfs_ifork_t *ifp,
int nrecs,
int disk,
xfs_exntfmt_t fmt)
{
xfs_bmbt_rec_t *ep;
xfs_bmbt_irec_t irec;
xfs_bmbt_rec_t rec;
int i;
for (i = 0; i < nrecs; i++) {
ep = xfs_iext_get_ext(ifp, i);
rec.l0 = get_unaligned((__uint64_t*)&ep->l0);
rec.l1 = get_unaligned((__uint64_t*)&ep->l1);
if (disk)
@ -94,11 +96,10 @@ xfs_validate_extents(
xfs_bmbt_get_all(&rec, &irec);
if (fmt == XFS_EXTFMT_NOSTATE)
ASSERT(irec.br_state == XFS_EXT_NORM);
ep++;
}
}
#else /* DEBUG */
#define xfs_validate_extents(ep, nrecs, disk, fmt)
#define xfs_validate_extents(ifp, nrecs, disk, fmt)
#endif /* DEBUG */
/*
@ -597,7 +598,6 @@ xfs_iformat_extents(
xfs_bmbt_rec_t *ep, *dp;
xfs_ifork_t *ifp;
int nex;
int real_size;
int size;
int i;
@ -619,23 +619,20 @@ xfs_iformat_extents(
return XFS_ERROR(EFSCORRUPTED);
}
real_size = 0;
ifp->if_real_bytes = 0;
if (nex == 0)
ifp->if_u1.if_extents = NULL;
else if (nex <= XFS_INLINE_EXTS)
ifp->if_u1.if_extents = ifp->if_u2.if_inline_ext;
else {
ifp->if_u1.if_extents = kmem_alloc(size, KM_SLEEP);
ASSERT(ifp->if_u1.if_extents != NULL);
real_size = size;
}
else
xfs_iext_add(ifp, 0, nex);
ifp->if_bytes = size;
ifp->if_real_bytes = real_size;
if (size) {
dp = (xfs_bmbt_rec_t *) XFS_DFORK_PTR(dip, whichfork);
xfs_validate_extents(dp, nex, 1, XFS_EXTFMT_INODE(ip));
ep = ifp->if_u1.if_extents;
for (i = 0; i < nex; i++, ep++, dp++) {
xfs_validate_extents(ifp, nex, 1, XFS_EXTFMT_INODE(ip));
for (i = 0; i < nex; i++, dp++) {
ep = xfs_iext_get_ext(ifp, i);
ep->l0 = INT_GET(get_unaligned((__uint64_t*)&dp->l0),
ARCH_CONVERT);
ep->l1 = INT_GET(get_unaligned((__uint64_t*)&dp->l1),
@ -646,7 +643,7 @@ xfs_iformat_extents(
if (whichfork != XFS_DATA_FORK ||
XFS_EXTFMT_INODE(ip) == XFS_EXTFMT_NOSTATE)
if (unlikely(xfs_check_nostate_extents(
ifp->if_u1.if_extents, nex))) {
ifp, 0, nex))) {
XFS_ERROR_REPORT("xfs_iformat_extents(2)",
XFS_ERRLEVEL_LOW,
ip->i_mount);
@ -1015,6 +1012,7 @@ xfs_iread_extents(
{
int error;
xfs_ifork_t *ifp;
xfs_extnum_t nextents;
size_t size;
if (unlikely(XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE)) {
@ -1022,26 +1020,24 @@ xfs_iread_extents(
ip->i_mount);
return XFS_ERROR(EFSCORRUPTED);
}
size = XFS_IFORK_NEXTENTS(ip, whichfork) * (uint)sizeof(xfs_bmbt_rec_t);
nextents = XFS_IFORK_NEXTENTS(ip, whichfork);
size = nextents * sizeof(xfs_bmbt_rec_t);
ifp = XFS_IFORK_PTR(ip, whichfork);
/*
* We know that the size is valid (it's checked in iformat_btree)
*/
ifp->if_u1.if_extents = kmem_alloc(size, KM_SLEEP);
ASSERT(ifp->if_u1.if_extents != NULL);
ifp->if_lastex = NULLEXTNUM;
ifp->if_bytes = ifp->if_real_bytes = (int)size;
ifp->if_bytes = ifp->if_real_bytes = 0;
ifp->if_flags |= XFS_IFEXTENTS;
xfs_iext_add(ifp, 0, nextents);
error = xfs_bmap_read_extents(tp, ip, whichfork);
if (error) {
kmem_free(ifp->if_u1.if_extents, size);
ifp->if_u1.if_extents = NULL;
ifp->if_bytes = ifp->if_real_bytes = 0;
xfs_iext_destroy(ifp);
ifp->if_flags &= ~XFS_IFEXTENTS;
return error;
}
xfs_validate_extents((xfs_bmbt_rec_t *)ifp->if_u1.if_extents,
XFS_IFORK_NEXTENTS(ip, whichfork), 0, XFS_EXTFMT_INODE(ip));
xfs_validate_extents(ifp, nextents, 0, XFS_EXTFMT_INODE(ip));
return 0;
}
@ -2475,92 +2471,6 @@ xfs_iroot_realloc(
}
/*
* This is called when the amount of space needed for if_extents
* is increased or decreased. The change in size is indicated by
* the number of extents that need to be added or deleted in the
* ext_diff parameter.
*
* If the amount of space needed has decreased below the size of the
* inline buffer, then switch to using the inline buffer. Otherwise,
* use kmem_realloc() or kmem_alloc() to adjust the size of the buffer
* to what is needed.
*
* ip -- the inode whose if_extents area is changing
* ext_diff -- the change in the number of extents, positive or negative,
* requested for the if_extents array.
*/
void
xfs_iext_realloc(
xfs_inode_t *ip,
int ext_diff,
int whichfork)
{
int byte_diff;
xfs_ifork_t *ifp;
int new_size;
uint rnew_size;
if (ext_diff == 0) {
return;
}
ifp = XFS_IFORK_PTR(ip, whichfork);
byte_diff = ext_diff * (uint)sizeof(xfs_bmbt_rec_t);
new_size = (int)ifp->if_bytes + byte_diff;
ASSERT(new_size >= 0);
if (new_size == 0) {
if (ifp->if_u1.if_extents != ifp->if_u2.if_inline_ext) {
ASSERT(ifp->if_real_bytes != 0);
kmem_free(ifp->if_u1.if_extents, ifp->if_real_bytes);
}
ifp->if_u1.if_extents = NULL;
rnew_size = 0;
} else if (new_size <= sizeof(ifp->if_u2.if_inline_ext)) {
/*
* If the valid extents can fit in if_inline_ext,
* copy them from the malloc'd vector and free it.
*/
if (ifp->if_u1.if_extents != ifp->if_u2.if_inline_ext) {
/*
* For now, empty files are format EXTENTS,
* so the if_extents pointer is null.
*/
if (ifp->if_u1.if_extents) {
memcpy(ifp->if_u2.if_inline_ext,
ifp->if_u1.if_extents, new_size);
kmem_free(ifp->if_u1.if_extents,
ifp->if_real_bytes);
}
ifp->if_u1.if_extents = ifp->if_u2.if_inline_ext;
}
rnew_size = 0;
} else {
rnew_size = new_size;
if ((rnew_size & (rnew_size - 1)) != 0)
rnew_size = xfs_iroundup(rnew_size);
/*
* Stuck with malloc/realloc.
*/
if (ifp->if_u1.if_extents == ifp->if_u2.if_inline_ext) {
ifp->if_u1.if_extents = (xfs_bmbt_rec_t *)
kmem_alloc(rnew_size, KM_SLEEP);
memcpy(ifp->if_u1.if_extents, ifp->if_u2.if_inline_ext,
sizeof(ifp->if_u2.if_inline_ext));
} else if (rnew_size != ifp->if_real_bytes) {
ifp->if_u1.if_extents = (xfs_bmbt_rec_t *)
kmem_realloc(ifp->if_u1.if_extents,
rnew_size,
ifp->if_real_bytes,
KM_NOFS);
}
}
ifp->if_real_bytes = rnew_size;
ifp->if_bytes = new_size;
}
/*
* This is called when the amount of space needed for if_data
* is increased or decreased. The change in size is indicated by
@ -2723,9 +2633,7 @@ xfs_idestroy_fork(
(ifp->if_u1.if_extents != NULL) &&
(ifp->if_u1.if_extents != ifp->if_u2.if_inline_ext)) {
ASSERT(ifp->if_real_bytes != 0);
kmem_free(ifp->if_u1.if_extents, ifp->if_real_bytes);
ifp->if_u1.if_extents = NULL;
ifp->if_real_bytes = 0;
xfs_iext_destroy(ifp);
}
ASSERT(ifp->if_u1.if_extents == NULL ||
ifp->if_u1.if_extents == ifp->if_u2.if_inline_ext);
@ -2902,16 +2810,15 @@ xfs_iextents_copy(
* the delayed ones. There must be at least one
* non-delayed extent.
*/
ep = ifp->if_u1.if_extents;
dest_ep = buffer;
copied = 0;
for (i = 0; i < nrecs; i++) {
ep = xfs_iext_get_ext(ifp, i);
start_block = xfs_bmbt_get_startblock(ep);
if (ISNULLSTARTBLOCK(start_block)) {
/*
* It's a delayed allocation extent, so skip it.
*/
ep++;
continue;
}
@ -2921,11 +2828,10 @@ xfs_iextents_copy(
put_unaligned(INT_GET(ep->l1, ARCH_CONVERT),
(__uint64_t*)&dest_ep->l1);
dest_ep++;
ep++;
copied++;
}
ASSERT(copied != 0);
xfs_validate_extents(buffer, copied, 1, XFS_EXTFMT_INODE(ip));
xfs_validate_extents(ifp, copied, 1, XFS_EXTFMT_INODE(ip));
return (copied * (uint)sizeof(xfs_bmbt_rec_t));
}
@ -2995,8 +2901,10 @@ xfs_iflush_fork(
case XFS_DINODE_FMT_EXTENTS:
ASSERT((ifp->if_flags & XFS_IFEXTENTS) ||
!(iip->ili_format.ilf_fields & extflag[whichfork]));
ASSERT((ifp->if_u1.if_extents != NULL) || (ifp->if_bytes == 0));
ASSERT((ifp->if_u1.if_extents == NULL) || (ifp->if_bytes > 0));
ASSERT((xfs_iext_get_ext(ifp, 0) != NULL) ||
(ifp->if_bytes == 0));
ASSERT((xfs_iext_get_ext(ifp, 0) == NULL) ||
(ifp->if_bytes > 0));
if ((iip->ili_format.ilf_fields & extflag[whichfork]) &&
(ifp->if_bytes > 0)) {
ASSERT(XFS_IFORK_NEXTENTS(ip, whichfork) > 0);
@ -3704,3 +3612,327 @@ xfs_ilock_trace(xfs_inode_t *ip, int lock, unsigned int lockflags, inst_t *ra)
NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL);
}
#endif
/*
* Return a pointer to the extent record at file index idx.
*/
xfs_bmbt_rec_t *
xfs_iext_get_ext(
xfs_ifork_t *ifp, /* inode fork pointer */
xfs_extnum_t idx) /* index of target extent */
{
ASSERT(idx >= 0);
if (ifp->if_bytes) {
return &ifp->if_u1.if_extents[idx];
} else {
return NULL;
}
}
/*
* Insert new item(s) into the extent records for incore inode
* fork 'ifp'. 'count' new items are inserted at index 'idx'.
*/
void
xfs_iext_insert(
xfs_ifork_t *ifp, /* inode fork pointer */
xfs_extnum_t idx, /* starting index of new items */
xfs_extnum_t count, /* number of inserted items */
xfs_bmbt_irec_t *new) /* items to insert */
{
xfs_bmbt_rec_t *ep; /* extent record pointer */
xfs_extnum_t i; /* extent record index */
ASSERT(ifp->if_flags & XFS_IFEXTENTS);
xfs_iext_add(ifp, idx, count);
for (i = idx; i < idx + count; i++, new++) {
ep = xfs_iext_get_ext(ifp, i);
xfs_bmbt_set_all(ep, new);
}
}
/*
* This is called when the amount of space required for incore file
* extents needs to be increased. The ext_diff parameter stores the
* number of new extents being added and the idx parameter contains
* the extent index where the new extents will be added. If the new
* extents are being appended, then we just need to (re)allocate and
* initialize the space. Otherwise, if the new extents are being
* inserted into the middle of the existing entries, a bit more work
* is required to make room for the new extents to be inserted. The
* caller is responsible for filling in the new extent entries upon
* return.
*/
void
xfs_iext_add(
xfs_ifork_t *ifp, /* inode fork pointer */
xfs_extnum_t idx, /* index to begin adding exts */
int ext_diff) /* nubmer of extents to add */
{
int byte_diff; /* new bytes being added */
int new_size; /* size of extents after adding */
xfs_extnum_t nextents; /* number of extents in file */
nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
ASSERT((idx >= 0) && (idx <= nextents));
byte_diff = ext_diff * sizeof(xfs_bmbt_rec_t);
new_size = ifp->if_bytes + byte_diff;
/*
* If the new number of extents (nextents + ext_diff)
* fits inside the inode, then continue to use the inline
* extent buffer.
*/
if (nextents + ext_diff <= XFS_INLINE_EXTS) {
if (idx < nextents) {
memmove(&ifp->if_u2.if_inline_ext[idx + ext_diff],
&ifp->if_u2.if_inline_ext[idx],
(nextents - idx) * sizeof(xfs_bmbt_rec_t));
memset(&ifp->if_u2.if_inline_ext[idx], 0, byte_diff);
}
ifp->if_u1.if_extents = ifp->if_u2.if_inline_ext;
ifp->if_real_bytes = 0;
}
/*
* Otherwise use a linear (direct) extent list.
* If the extents are currently inside the inode,
* xfs_iext_realloc_direct will switch us from
* inline to direct extent allocation mode.
*/
else {
xfs_iext_realloc_direct(ifp, new_size);
if (idx < nextents) {
memmove(&ifp->if_u1.if_extents[idx + ext_diff],
&ifp->if_u1.if_extents[idx],
(nextents - idx) * sizeof(xfs_bmbt_rec_t));
memset(&ifp->if_u1.if_extents[idx], 0, byte_diff);
}
}
ifp->if_bytes = new_size;
}
/*
* This is called when the amount of space required for incore file
* extents needs to be decreased. The ext_diff parameter stores the
* number of extents to be removed and the idx parameter contains
* the extent index where the extents will be removed from.
*/
void
xfs_iext_remove(
xfs_ifork_t *ifp, /* inode fork pointer */
xfs_extnum_t idx, /* index to begin removing exts */
int ext_diff) /* number of extents to remove */
{
xfs_extnum_t nextents; /* number of extents in file */
int new_size; /* size of extents after removal */
ASSERT(ext_diff > 0);
nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
new_size = (nextents - ext_diff) * sizeof(xfs_bmbt_rec_t);
if (new_size == 0) {
xfs_iext_destroy(ifp);
} else if (ifp->if_real_bytes) {
xfs_iext_remove_direct(ifp, idx, ext_diff);
} else {
xfs_iext_remove_inline(ifp, idx, ext_diff);
}
ifp->if_bytes = new_size;
}
/*
* This removes ext_diff extents from the inline buffer, beginning
* at extent index idx.
*/
void
xfs_iext_remove_inline(
xfs_ifork_t *ifp, /* inode fork pointer */
xfs_extnum_t idx, /* index to begin removing exts */
int ext_diff) /* number of extents to remove */
{
int nextents; /* number of extents in file */
ASSERT(idx < XFS_INLINE_EXTS);
nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
ASSERT(((nextents - ext_diff) > 0) &&
(nextents - ext_diff) < XFS_INLINE_EXTS);
if (idx + ext_diff < nextents) {
memmove(&ifp->if_u2.if_inline_ext[idx],
&ifp->if_u2.if_inline_ext[idx + ext_diff],
(nextents - (idx + ext_diff)) *
sizeof(xfs_bmbt_rec_t));
memset(&ifp->if_u2.if_inline_ext[nextents - ext_diff],
0, ext_diff * sizeof(xfs_bmbt_rec_t));
} else {
memset(&ifp->if_u2.if_inline_ext[idx], 0,
ext_diff * sizeof(xfs_bmbt_rec_t));
}
}
/*
* This removes ext_diff extents from a linear (direct) extent list,
* beginning at extent index idx. If the extents are being removed
* from the end of the list (ie. truncate) then we just need to re-
* allocate the list to remove the extra space. Otherwise, if the
* extents are being removed from the middle of the existing extent
* entries, then we first need to move the extent records beginning
* at idx + ext_diff up in the list to overwrite the records being
* removed, then remove the extra space via kmem_realloc.
*/
void
xfs_iext_remove_direct(
xfs_ifork_t *ifp, /* inode fork pointer */
xfs_extnum_t idx, /* index to begin removing exts */
int ext_diff) /* number of extents to remove */
{
xfs_extnum_t nextents; /* number of extents in file */
int new_size; /* size of extents after removal */
new_size = ifp->if_bytes -
(ext_diff * sizeof(xfs_bmbt_rec_t));
nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
if (new_size == 0) {
xfs_iext_destroy(ifp);
return;
}
/* Move extents up in the list (if needed) */
if (idx + ext_diff < nextents) {
memmove(&ifp->if_u1.if_extents[idx],
&ifp->if_u1.if_extents[idx + ext_diff],
(nextents - (idx + ext_diff)) *
sizeof(xfs_bmbt_rec_t));
}
memset(&ifp->if_u1.if_extents[nextents - ext_diff],
0, ext_diff * sizeof(xfs_bmbt_rec_t));
/*
* Reallocate the direct extent list. If the extents
* will fit inside the inode then xfs_iext_realloc_direct
* will switch from direct to inline extent allocation
* mode for us.
*/
xfs_iext_realloc_direct(ifp, new_size);
ifp->if_bytes = new_size;
}
/*
* Create, destroy, or resize a linear (direct) block of extents.
*/
void
xfs_iext_realloc_direct(
xfs_ifork_t *ifp, /* inode fork pointer */
int new_size) /* new size of extents */
{
int rnew_size; /* real new size of extents */
rnew_size = new_size;
/* Free extent records */
if (new_size == 0) {
xfs_iext_destroy(ifp);
}
/* Resize direct extent list and zero any new bytes */
else if (ifp->if_real_bytes) {
/* Check if extents will fit inside the inode */
if (new_size <= XFS_INLINE_EXTS * sizeof(xfs_bmbt_rec_t)) {
xfs_iext_direct_to_inline(ifp, new_size /
(uint)sizeof(xfs_bmbt_rec_t));
ifp->if_bytes = new_size;
return;
}
if ((new_size & (new_size - 1)) != 0) {
rnew_size = xfs_iroundup(new_size);
}
if (rnew_size != ifp->if_real_bytes) {
ifp->if_u1.if_extents = (xfs_bmbt_rec_t *)
kmem_realloc(ifp->if_u1.if_extents,
rnew_size,
ifp->if_real_bytes,
KM_SLEEP);
}
if (rnew_size > ifp->if_real_bytes) {
memset(&ifp->if_u1.if_extents[ifp->if_bytes /
(uint)sizeof(xfs_bmbt_rec_t)], 0,
rnew_size - ifp->if_real_bytes);
}
}
/*
* Switch from the inline extent buffer to a direct
* extent list. Be sure to include the inline extent
* bytes in new_size.
*/
else {
new_size += ifp->if_bytes;
if ((new_size & (new_size - 1)) != 0) {
rnew_size = xfs_iroundup(new_size);
}
xfs_iext_inline_to_direct(ifp, rnew_size);
}
ifp->if_real_bytes = rnew_size;
ifp->if_bytes = new_size;
}
/*
* Switch from linear (direct) extent records to inline buffer.
*/
void
xfs_iext_direct_to_inline(
xfs_ifork_t *ifp, /* inode fork pointer */
xfs_extnum_t nextents) /* number of extents in file */
{
ASSERT(ifp->if_flags & XFS_IFEXTENTS);
ASSERT(nextents <= XFS_INLINE_EXTS);
/*
* The inline buffer was zeroed when we switched
* from inline to direct extent allocation mode,
* so we don't need to clear it here.
*/
memcpy(ifp->if_u2.if_inline_ext, ifp->if_u1.if_extents,
nextents * sizeof(xfs_bmbt_rec_t));
kmem_free(ifp->if_u1.if_extents, KM_SLEEP);
ifp->if_u1.if_extents = ifp->if_u2.if_inline_ext;
ifp->if_real_bytes = 0;
}
/*
* Switch from inline buffer to linear (direct) extent records.
* new_size should already be rounded up to the next power of 2
* by the caller (when appropriate), so use new_size as it is.
* However, since new_size may be rounded up, we can't update
* if_bytes here. It is the caller's responsibility to update
* if_bytes upon return.
*/
void
xfs_iext_inline_to_direct(
xfs_ifork_t *ifp, /* inode fork pointer */
int new_size) /* number of extents in file */
{
ifp->if_u1.if_extents = (xfs_bmbt_rec_t *)
kmem_alloc(new_size, KM_SLEEP);
memset(ifp->if_u1.if_extents, 0, new_size);
if (ifp->if_bytes) {
memcpy(ifp->if_u1.if_extents, ifp->if_u2.if_inline_ext,
ifp->if_bytes);
memset(ifp->if_u2.if_inline_ext, 0, XFS_INLINE_EXTS *
sizeof(xfs_bmbt_rec_t));
}
ifp->if_real_bytes = new_size;
}
/*
* Free incore file extents.
*/
void
xfs_iext_destroy(
xfs_ifork_t *ifp) /* inode fork pointer */
{
if (ifp->if_real_bytes) {
kmem_free(ifp->if_u1.if_extents, ifp->if_real_bytes);
} else if (ifp->if_bytes) {
memset(ifp->if_u2.if_inline_ext, 0, XFS_INLINE_EXTS *
sizeof(xfs_bmbt_rec_t));
}
ifp->if_u1.if_extents = NULL;
ifp->if_real_bytes = 0;
ifp->if_bytes = 0;
}

18
fs/xfs/xfs_inode.h
View File

@ -70,12 +70,6 @@ typedef struct xfs_ifork {
*/
#define XFS_IMAP_LOOKUP 0x1
/*
* Maximum number of extent pointers in if_u1.if_extents.
*/
#define XFS_MAX_INCORE_EXTENTS 32768
#ifdef __KERNEL__
struct bhv_desc;
struct cred;
@ -440,6 +434,18 @@ xfs_inode_t *xfs_vtoi(struct vnode *vp);
void xfs_synchronize_atime(xfs_inode_t *);
xfs_bmbt_rec_t *xfs_iext_get_ext(xfs_ifork_t *, xfs_extnum_t);
void xfs_iext_insert(xfs_ifork_t *, xfs_extnum_t, xfs_extnum_t,
xfs_bmbt_irec_t *);
void xfs_iext_add(xfs_ifork_t *, xfs_extnum_t, int);
void xfs_iext_remove(xfs_ifork_t *, xfs_extnum_t, int);
void xfs_iext_remove_inline(xfs_ifork_t *, xfs_extnum_t, int);
void xfs_iext_remove_direct(xfs_ifork_t *, xfs_extnum_t, int);
void xfs_iext_realloc_direct(xfs_ifork_t *, int);
void xfs_iext_direct_to_inline(xfs_ifork_t *, xfs_extnum_t);
void xfs_iext_inline_to_direct(xfs_ifork_t *, int);
void xfs_iext_destroy(xfs_ifork_t *);
#define xfs_ipincount(ip) ((unsigned int) atomic_read(&ip->i_pincount))
#ifdef DEBUG