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kernel-fxtec-pro1x/fs/xfs/xfs_inode.c
Dave Chinner c854363e80 xfs: Use delayed write for inodes rather than async V2 
We currently do background inode flush asynchronously, resulting in
inodes being written in whatever order the background writeback
issues them. Not only that, there are also blocking and non-blocking
asynchronous inode flushes, depending on where the flush comes from.

This patch completely removes asynchronous inode writeback. It
removes all the strange writeback modes and replaces them with
either a synchronous flush or a non-blocking delayed write flush.
That is, inode flushes will only issue IO directly if they are
synchronous, and background flushing may do nothing if the operation
would block (e.g. on a pinned inode or buffer lock).

Delayed write flushes will now result in the inode buffer sitting in
the delwri queue of the buffer cache to be flushed by either an AIL
push or by the xfsbufd timing out the buffer. This will allow
accumulation of dirty inode buffers in memory and allow optimisation
of inode cluster writeback at the xfsbufd level where we have much
greater queue depths than the block layer elevators. We will also
get adjacent inode cluster buffer IO merging for free when a later
patch in the series allows sorting of the delayed write buffers
before dispatch.

This effectively means that any inode that is written back by
background writeback will be seen as flush locked during AIL
pushing, and will result in the buffers being pushed from there.
This writeback path is currently non-optimal, but the next patch
in the series will fix that problem.

A side effect of this delayed write mechanism is that background
inode reclaim will no longer directly flush inodes, nor can it wait
on the flush lock. The result is that inode reclaim must leave the
inode in the reclaimable state until it is clean. Hence attempts to
reclaim a dirty inode in the background will simply skip the inode
until it is clean and this allows other mechanisms (i.e. xfsbufd) to
do more optimal writeback of the dirty buffers. As a result, the
inode reclaim code has been rewritten so that it no longer relies on
the ambiguous return values of xfs_iflush() to determine whether it
is safe to reclaim an inode.

Portions of this patch are derived from patches by Christoph
Hellwig.

Version 2:
- cleanup reclaim code as suggested by Christoph
- log background reclaim inode flush errors
- just pass sync flags to xfs_iflush

Signed-off-by: Dave Chinner <david@fromorbit.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
2010-02-06 12:39:36 +11:00

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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 <linux/log2.h>
#include "xfs.h"
#include "xfs_fs.h"
#include "xfs_types.h"
#include "xfs_bit.h"
#include "xfs_log.h"
#include "xfs_inum.h"
#include "xfs_trans.h"
#include "xfs_trans_priv.h"
#include "xfs_sb.h"
#include "xfs_ag.h"
#include "xfs_dir2.h"
#include "xfs_dmapi.h"
#include "xfs_mount.h"
#include "xfs_bmap_btree.h"
#include "xfs_alloc_btree.h"
#include "xfs_ialloc_btree.h"
#include "xfs_dir2_sf.h"
#include "xfs_attr_sf.h"
#include "xfs_dinode.h"
#include "xfs_inode.h"
#include "xfs_buf_item.h"
#include "xfs_inode_item.h"
#include "xfs_btree.h"
#include "xfs_btree_trace.h"
#include "xfs_alloc.h"
#include "xfs_ialloc.h"
#include "xfs_bmap.h"
#include "xfs_rw.h"
#include "xfs_error.h"
#include "xfs_utils.h"
#include "xfs_quota.h"
#include "xfs_filestream.h"
#include "xfs_vnodeops.h"
#include "xfs_trace.h"
kmem_zone_t *xfs_ifork_zone;
kmem_zone_t *xfs_inode_zone;
/*
* Used in xfs_itruncate(). This is the maximum number of extents
* freed from a file in a single transaction.
*/
#define XFS_ITRUNC_MAX_EXTENTS 2
STATIC int xfs_iflush_int(xfs_inode_t *, xfs_buf_t *);
STATIC int xfs_iformat_local(xfs_inode_t *, xfs_dinode_t *, int, int);
STATIC int xfs_iformat_extents(xfs_inode_t *, xfs_dinode_t *, int);
STATIC int xfs_iformat_btree(xfs_inode_t *, xfs_dinode_t *, int);
#ifdef DEBUG
/*
* Make sure that the extents in the given memory buffer
* are valid.
*/
STATIC void
xfs_validate_extents(
xfs_ifork_t *ifp,
int nrecs,
xfs_exntfmt_t fmt)
{
xfs_bmbt_irec_t irec;
xfs_bmbt_rec_host_t rec;
int i;
for (i = 0; i < nrecs; i++) {
xfs_bmbt_rec_host_t *ep = xfs_iext_get_ext(ifp, i);
rec.l0 = get_unaligned(&ep->l0);
rec.l1 = get_unaligned(&ep->l1);
xfs_bmbt_get_all(&rec, &irec);
if (fmt == XFS_EXTFMT_NOSTATE)
ASSERT(irec.br_state == XFS_EXT_NORM);
}
}
#else /* DEBUG */
#define xfs_validate_extents(ifp, nrecs, fmt)
#endif /* DEBUG */
/*
* Check that none of the inode's in the buffer have a next
* unlinked field of 0.
*/
#if defined(DEBUG)
void
xfs_inobp_check(
xfs_mount_t *mp,
xfs_buf_t *bp)
{
int i;
int j;
xfs_dinode_t *dip;
j = mp->m_inode_cluster_size >> mp->m_sb.sb_inodelog;
for (i = 0; i < j; i++) {
dip = (xfs_dinode_t *)xfs_buf_offset(bp,
i * mp->m_sb.sb_inodesize);
if (!dip->di_next_unlinked) {
xfs_fs_cmn_err(CE_ALERT, mp,
"Detected a bogus zero next_unlinked field in incore inode buffer 0x%p. About to pop an ASSERT.",
bp);
ASSERT(dip->di_next_unlinked);
}
}
}
#endif
/*
* Find the buffer associated with the given inode map
* We do basic validation checks on the buffer once it has been
* retrieved from disk.
*/
STATIC int
xfs_imap_to_bp(
xfs_mount_t *mp,
xfs_trans_t *tp,
struct xfs_imap *imap,
xfs_buf_t **bpp,
uint buf_flags,
uint iget_flags)
{
int error;
int i;
int ni;
xfs_buf_t *bp;
error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp, imap->im_blkno,
(int)imap->im_len, buf_flags, &bp);
if (error) {
if (error != EAGAIN) {
cmn_err(CE_WARN,
"xfs_imap_to_bp: xfs_trans_read_buf()returned "
"an error %d on %s. Returning error.",
error, mp->m_fsname);
} else {
ASSERT(buf_flags & XBF_TRYLOCK);
}
return error;
}
/*
* Validate the magic number and version of every inode in the buffer
* (if DEBUG kernel) or the first inode in the buffer, otherwise.
*/
#ifdef DEBUG
ni = BBTOB(imap->im_len) >> mp->m_sb.sb_inodelog;
#else /* usual case */
ni = 1;
#endif
for (i = 0; i < ni; i++) {
int di_ok;
xfs_dinode_t *dip;
dip = (xfs_dinode_t *)xfs_buf_offset(bp,
(i << mp->m_sb.sb_inodelog));
di_ok = be16_to_cpu(dip->di_magic) == XFS_DINODE_MAGIC &&
XFS_DINODE_GOOD_VERSION(dip->di_version);
if (unlikely(XFS_TEST_ERROR(!di_ok, mp,
XFS_ERRTAG_ITOBP_INOTOBP,
XFS_RANDOM_ITOBP_INOTOBP))) {
if (iget_flags & XFS_IGET_BULKSTAT) {
xfs_trans_brelse(tp, bp);
return XFS_ERROR(EINVAL);
}
XFS_CORRUPTION_ERROR("xfs_imap_to_bp",
XFS_ERRLEVEL_HIGH, mp, dip);
#ifdef DEBUG
cmn_err(CE_PANIC,
"Device %s - bad inode magic/vsn "
"daddr %lld #%d (magic=%x)",
XFS_BUFTARG_NAME(mp->m_ddev_targp),
(unsigned long long)imap->im_blkno, i,
be16_to_cpu(dip->di_magic));
#endif
xfs_trans_brelse(tp, bp);
return XFS_ERROR(EFSCORRUPTED);
}
}
xfs_inobp_check(mp, bp);
/*
* Mark the buffer as an inode buffer now that it looks good
*/
XFS_BUF_SET_VTYPE(bp, B_FS_INO);
*bpp = bp;
return 0;
}
/*
* This routine is called to map an inode number within a file
* system to the buffer containing the on-disk version of the
* inode. It returns a pointer to the buffer containing the
* on-disk inode in the bpp parameter, and in the dip parameter
* it returns a pointer to the on-disk inode within that buffer.
*
* If a non-zero error is returned, then the contents of bpp and
* dipp are undefined.
*
* Use xfs_imap() to determine the size and location of the
* buffer to read from disk.
*/
int
xfs_inotobp(
xfs_mount_t *mp,
xfs_trans_t *tp,
xfs_ino_t ino,
xfs_dinode_t **dipp,
xfs_buf_t **bpp,
int *offset,
uint imap_flags)
{
struct xfs_imap imap;
xfs_buf_t *bp;
int error;
imap.im_blkno = 0;
error = xfs_imap(mp, tp, ino, &imap, imap_flags);
if (error)
return error;
error = xfs_imap_to_bp(mp, tp, &imap, &bp, XBF_LOCK, imap_flags);
if (error)
return error;
*dipp = (xfs_dinode_t *)xfs_buf_offset(bp, imap.im_boffset);
*bpp = bp;
*offset = imap.im_boffset;
return 0;
}
/*
* This routine is called to map an inode to the buffer containing
* the on-disk version of the inode. It returns a pointer to the
* buffer containing the on-disk inode in the bpp parameter, and in
* the dip parameter it returns a pointer to the on-disk inode within
* that buffer.
*
* If a non-zero error is returned, then the contents of bpp and
* dipp are undefined.
*
* The inode is expected to already been mapped to its buffer and read
* in once, thus we can use the mapping information stored in the inode
* rather than calling xfs_imap(). This allows us to avoid the overhead
* of looking at the inode btree for small block file systems
* (see xfs_imap()).
*/
int
xfs_itobp(
xfs_mount_t *mp,
xfs_trans_t *tp,
xfs_inode_t *ip,
xfs_dinode_t **dipp,
xfs_buf_t **bpp,
uint buf_flags)
{
xfs_buf_t *bp;
int error;
ASSERT(ip->i_imap.im_blkno != 0);
error = xfs_imap_to_bp(mp, tp, &ip->i_imap, &bp, buf_flags, 0);
if (error)
return error;
if (!bp) {
ASSERT(buf_flags & XBF_TRYLOCK);
ASSERT(tp == NULL);
*bpp = NULL;
return EAGAIN;
}
*dipp = (xfs_dinode_t *)xfs_buf_offset(bp, ip->i_imap.im_boffset);
*bpp = bp;
return 0;
}
/*
* Move inode type and inode format specific information from the
* on-disk inode to the in-core inode. For fifos, devs, and sockets
* this means set if_rdev to the proper value. For files, directories,
* and symlinks this means to bring in the in-line data or extent
* pointers. For a file in B-tree format, only the root is immediately
* brought in-core. The rest will be in-lined in if_extents when it
* is first referenced (see xfs_iread_extents()).
*/
STATIC int
xfs_iformat(
xfs_inode_t *ip,
xfs_dinode_t *dip)
{
xfs_attr_shortform_t *atp;
int size;
int error;
xfs_fsize_t di_size;
ip->i_df.if_ext_max =
XFS_IFORK_DSIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t);
error = 0;
if (unlikely(be32_to_cpu(dip->di_nextents) +
be16_to_cpu(dip->di_anextents) >
be64_to_cpu(dip->di_nblocks))) {
xfs_fs_repair_cmn_err(CE_WARN, ip->i_mount,
"corrupt dinode %Lu, extent total = %d, nblocks = %Lu.",
(unsigned long long)ip->i_ino,
(int)(be32_to_cpu(dip->di_nextents) +
be16_to_cpu(dip->di_anextents)),
(unsigned long long)
be64_to_cpu(dip->di_nblocks));
XFS_CORRUPTION_ERROR("xfs_iformat(1)", XFS_ERRLEVEL_LOW,
ip->i_mount, dip);
return XFS_ERROR(EFSCORRUPTED);
}
if (unlikely(dip->di_forkoff > ip->i_mount->m_sb.sb_inodesize)) {
xfs_fs_repair_cmn_err(CE_WARN, ip->i_mount,
"corrupt dinode %Lu, forkoff = 0x%x.",
(unsigned long long)ip->i_ino,
dip->di_forkoff);
XFS_CORRUPTION_ERROR("xfs_iformat(2)", XFS_ERRLEVEL_LOW,
ip->i_mount, dip);
return XFS_ERROR(EFSCORRUPTED);
}
if (unlikely((ip->i_d.di_flags & XFS_DIFLAG_REALTIME) &&
!ip->i_mount->m_rtdev_targp)) {
xfs_fs_repair_cmn_err(CE_WARN, ip->i_mount,
"corrupt dinode %Lu, has realtime flag set.",
ip->i_ino);
XFS_CORRUPTION_ERROR("xfs_iformat(realtime)",
XFS_ERRLEVEL_LOW, ip->i_mount, dip);
return XFS_ERROR(EFSCORRUPTED);
}
switch (ip->i_d.di_mode & S_IFMT) {
case S_IFIFO:
case S_IFCHR:
case S_IFBLK:
case S_IFSOCK:
if (unlikely(dip->di_format != XFS_DINODE_FMT_DEV)) {
XFS_CORRUPTION_ERROR("xfs_iformat(3)", XFS_ERRLEVEL_LOW,
ip->i_mount, dip);
return XFS_ERROR(EFSCORRUPTED);
}
ip->i_d.di_size = 0;
ip->i_size = 0;
ip->i_df.if_u2.if_rdev = xfs_dinode_get_rdev(dip);
break;
case S_IFREG:
case S_IFLNK:
case S_IFDIR:
switch (dip->di_format) {
case XFS_DINODE_FMT_LOCAL:
/*
* no local regular files yet
*/
if (unlikely((be16_to_cpu(dip->di_mode) & S_IFMT) == S_IFREG)) {
xfs_fs_repair_cmn_err(CE_WARN, ip->i_mount,
"corrupt inode %Lu "
"(local format for regular file).",
(unsigned long long) ip->i_ino);
XFS_CORRUPTION_ERROR("xfs_iformat(4)",
XFS_ERRLEVEL_LOW,
ip->i_mount, dip);
return XFS_ERROR(EFSCORRUPTED);
}
di_size = be64_to_cpu(dip->di_size);
if (unlikely(di_size > XFS_DFORK_DSIZE(dip, ip->i_mount))) {
xfs_fs_repair_cmn_err(CE_WARN, ip->i_mount,
"corrupt inode %Lu "
"(bad size %Ld for local inode).",
(unsigned long long) ip->i_ino,
(long long) di_size);
XFS_CORRUPTION_ERROR("xfs_iformat(5)",
XFS_ERRLEVEL_LOW,
ip->i_mount, dip);
return XFS_ERROR(EFSCORRUPTED);
}
size = (int)di_size;
error = xfs_iformat_local(ip, dip, XFS_DATA_FORK, size);
break;
case XFS_DINODE_FMT_EXTENTS:
error = xfs_iformat_extents(ip, dip, XFS_DATA_FORK);
break;
case XFS_DINODE_FMT_BTREE:
error = xfs_iformat_btree(ip, dip, XFS_DATA_FORK);
break;
default:
XFS_ERROR_REPORT("xfs_iformat(6)", XFS_ERRLEVEL_LOW,
ip->i_mount);
return XFS_ERROR(EFSCORRUPTED);
}
break;
default:
XFS_ERROR_REPORT("xfs_iformat(7)", XFS_ERRLEVEL_LOW, ip->i_mount);
return XFS_ERROR(EFSCORRUPTED);
}
if (error) {
return error;
}
if (!XFS_DFORK_Q(dip))
return 0;
ASSERT(ip->i_afp == NULL);
ip->i_afp = kmem_zone_zalloc(xfs_ifork_zone, KM_SLEEP);
ip->i_afp->if_ext_max =
XFS_IFORK_ASIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t);
switch (dip->di_aformat) {
case XFS_DINODE_FMT_LOCAL:
atp = (xfs_attr_shortform_t *)XFS_DFORK_APTR(dip);
size = be16_to_cpu(atp->hdr.totsize);
if (unlikely(size < sizeof(struct xfs_attr_sf_hdr))) {
xfs_fs_repair_cmn_err(CE_WARN, ip->i_mount,
"corrupt inode %Lu "
"(bad attr fork size %Ld).",
(unsigned long long) ip->i_ino,
(long long) size);
XFS_CORRUPTION_ERROR("xfs_iformat(8)",
XFS_ERRLEVEL_LOW,
ip->i_mount, dip);
return XFS_ERROR(EFSCORRUPTED);
}
error = xfs_iformat_local(ip, dip, XFS_ATTR_FORK, size);
break;
case XFS_DINODE_FMT_EXTENTS:
error = xfs_iformat_extents(ip, dip, XFS_ATTR_FORK);
break;
case XFS_DINODE_FMT_BTREE:
error = xfs_iformat_btree(ip, dip, XFS_ATTR_FORK);
break;
default:
error = XFS_ERROR(EFSCORRUPTED);
break;
}
if (error) {
kmem_zone_free(xfs_ifork_zone, ip->i_afp);
ip->i_afp = NULL;
xfs_idestroy_fork(ip, XFS_DATA_FORK);
}
return error;
}
/*
* The file is in-lined in the on-disk inode.
* If it fits into if_inline_data, then copy
* it there, otherwise allocate a buffer for it
* and copy the data there. Either way, set
* if_data to point at the data.
* If we allocate a buffer for the data, make
* sure that its size is a multiple of 4 and
* record the real size in i_real_bytes.
*/
STATIC int
xfs_iformat_local(
xfs_inode_t *ip,
xfs_dinode_t *dip,
int whichfork,
int size)
{
xfs_ifork_t *ifp;
int real_size;
/*
* If the size is unreasonable, then something
* is wrong and we just bail out rather than crash in
* kmem_alloc() or memcpy() below.
*/
if (unlikely(size > XFS_DFORK_SIZE(dip, ip->i_mount, whichfork))) {
xfs_fs_repair_cmn_err(CE_WARN, ip->i_mount,
"corrupt inode %Lu "
"(bad size %d for local fork, size = %d).",
(unsigned long long) ip->i_ino, size,
XFS_DFORK_SIZE(dip, ip->i_mount, whichfork));
XFS_CORRUPTION_ERROR("xfs_iformat_local", XFS_ERRLEVEL_LOW,
ip->i_mount, dip);
return XFS_ERROR(EFSCORRUPTED);
}
ifp = XFS_IFORK_PTR(ip, whichfork);
real_size = 0;
if (size == 0)
ifp->if_u1.if_data = NULL;
else if (size <= sizeof(ifp->if_u2.if_inline_data))
ifp->if_u1.if_data = ifp->if_u2.if_inline_data;
else {
real_size = roundup(size, 4);
ifp->if_u1.if_data = kmem_alloc(real_size, KM_SLEEP);
}
ifp->if_bytes = size;
ifp->if_real_bytes = real_size;
if (size)
memcpy(ifp->if_u1.if_data, XFS_DFORK_PTR(dip, whichfork), size);
ifp->if_flags &= ~XFS_IFEXTENTS;
ifp->if_flags |= XFS_IFINLINE;
return 0;
}
/*
* The file consists of a set of extents all
* of which fit into the on-disk inode.
* If there are few enough extents to fit into
* the if_inline_ext, then copy them there.
* Otherwise allocate a buffer for them and copy
* them into it. Either way, set if_extents
* to point at the extents.
*/
STATIC int
xfs_iformat_extents(
xfs_inode_t *ip,
xfs_dinode_t *dip,
int whichfork)
{
xfs_bmbt_rec_t *dp;
xfs_ifork_t *ifp;
int nex;
int size;
int i;
ifp = XFS_IFORK_PTR(ip, whichfork);
nex = XFS_DFORK_NEXTENTS(dip, whichfork);
size = nex * (uint)sizeof(xfs_bmbt_rec_t);
/*
* If the number of extents is unreasonable, then something
* is wrong and we just bail out rather than crash in
* kmem_alloc() or memcpy() below.
*/
if (unlikely(size < 0 || size > XFS_DFORK_SIZE(dip, ip->i_mount, whichfork))) {
xfs_fs_repair_cmn_err(CE_WARN, ip->i_mount,
"corrupt inode %Lu ((a)extents = %d).",
(unsigned long long) ip->i_ino, nex);
XFS_CORRUPTION_ERROR("xfs_iformat_extents(1)", XFS_ERRLEVEL_LOW,
ip->i_mount, dip);
return XFS_ERROR(EFSCORRUPTED);
}
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
xfs_iext_add(ifp, 0, nex);
ifp->if_bytes = size;
if (size) {
dp = (xfs_bmbt_rec_t *) XFS_DFORK_PTR(dip, whichfork);
xfs_validate_extents(ifp, nex, XFS_EXTFMT_INODE(ip));
for (i = 0; i < nex; i++, dp++) {
xfs_bmbt_rec_host_t *ep = xfs_iext_get_ext(ifp, i);
ep->l0 = get_unaligned_be64(&dp->l0);
ep->l1 = get_unaligned_be64(&dp->l1);
}
XFS_BMAP_TRACE_EXLIST(ip, nex, whichfork);
if (whichfork != XFS_DATA_FORK ||
XFS_EXTFMT_INODE(ip) == XFS_EXTFMT_NOSTATE)
if (unlikely(xfs_check_nostate_extents(
ifp, 0, nex))) {
XFS_ERROR_REPORT("xfs_iformat_extents(2)",
XFS_ERRLEVEL_LOW,
ip->i_mount);
return XFS_ERROR(EFSCORRUPTED);
}
}
ifp->if_flags |= XFS_IFEXTENTS;
return 0;
}
/*
* The file has too many extents to fit into
* the inode, so they are in B-tree format.
* Allocate a buffer for the root of the B-tree
* and copy the root into it. The i_extents
* field will remain NULL until all of the
* extents are read in (when they are needed).
*/
STATIC int
xfs_iformat_btree(
xfs_inode_t *ip,
xfs_dinode_t *dip,
int whichfork)
{
xfs_bmdr_block_t *dfp;
xfs_ifork_t *ifp;
/* REFERENCED */
int nrecs;
int size;
ifp = XFS_IFORK_PTR(ip, whichfork);
dfp = (xfs_bmdr_block_t *)XFS_DFORK_PTR(dip, whichfork);
size = XFS_BMAP_BROOT_SPACE(dfp);
nrecs = be16_to_cpu(dfp->bb_numrecs);
/*
* blow out if -- fork has less extents than can fit in
* fork (fork shouldn't be a btree format), root btree
* block has more records than can fit into the fork,
* or the number of extents is greater than the number of
* blocks.
*/
if (unlikely(XFS_IFORK_NEXTENTS(ip, whichfork) <= ifp->if_ext_max
|| XFS_BMDR_SPACE_CALC(nrecs) >
XFS_DFORK_SIZE(dip, ip->i_mount, whichfork)
|| XFS_IFORK_NEXTENTS(ip, whichfork) > ip->i_d.di_nblocks)) {
xfs_fs_repair_cmn_err(CE_WARN, ip->i_mount,
"corrupt inode %Lu (btree).",
(unsigned long long) ip->i_ino);
XFS_ERROR_REPORT("xfs_iformat_btree", XFS_ERRLEVEL_LOW,
ip->i_mount);
return XFS_ERROR(EFSCORRUPTED);
}
ifp->if_broot_bytes = size;
ifp->if_broot = kmem_alloc(size, KM_SLEEP);
ASSERT(ifp->if_broot != NULL);
/*
* Copy and convert from the on-disk structure
* to the in-memory structure.
*/
xfs_bmdr_to_bmbt(ip->i_mount, dfp,
XFS_DFORK_SIZE(dip, ip->i_mount, whichfork),
ifp->if_broot, size);
ifp->if_flags &= ~XFS_IFEXTENTS;
ifp->if_flags |= XFS_IFBROOT;
return 0;
}
STATIC void
xfs_dinode_from_disk(
xfs_icdinode_t *to,
xfs_dinode_t *from)
{
to->di_magic = be16_to_cpu(from->di_magic);
to->di_mode = be16_to_cpu(from->di_mode);
to->di_version = from ->di_version;
to->di_format = from->di_format;
to->di_onlink = be16_to_cpu(from->di_onlink);
to->di_uid = be32_to_cpu(from->di_uid);
to->di_gid = be32_to_cpu(from->di_gid);
to->di_nlink = be32_to_cpu(from->di_nlink);
to->di_projid = be16_to_cpu(from->di_projid);
memcpy(to->di_pad, from->di_pad, sizeof(to->di_pad));
to->di_flushiter = be16_to_cpu(from->di_flushiter);
to->di_atime.t_sec = be32_to_cpu(from->di_atime.t_sec);
to->di_atime.t_nsec = be32_to_cpu(from->di_atime.t_nsec);
to->di_mtime.t_sec = be32_to_cpu(from->di_mtime.t_sec);
to->di_mtime.t_nsec = be32_to_cpu(from->di_mtime.t_nsec);
to->di_ctime.t_sec = be32_to_cpu(from->di_ctime.t_sec);
to->di_ctime.t_nsec = be32_to_cpu(from->di_ctime.t_nsec);
to->di_size = be64_to_cpu(from->di_size);
to->di_nblocks = be64_to_cpu(from->di_nblocks);
to->di_extsize = be32_to_cpu(from->di_extsize);
to->di_nextents = be32_to_cpu(from->di_nextents);
to->di_anextents = be16_to_cpu(from->di_anextents);
to->di_forkoff = from->di_forkoff;
to->di_aformat = from->di_aformat;
to->di_dmevmask = be32_to_cpu(from->di_dmevmask);
to->di_dmstate = be16_to_cpu(from->di_dmstate);
to->di_flags = be16_to_cpu(from->di_flags);
to->di_gen = be32_to_cpu(from->di_gen);
}
void
xfs_dinode_to_disk(
xfs_dinode_t *to,
xfs_icdinode_t *from)
{
to->di_magic = cpu_to_be16(from->di_magic);
to->di_mode = cpu_to_be16(from->di_mode);
to->di_version = from ->di_version;
to->di_format = from->di_format;
to->di_onlink = cpu_to_be16(from->di_onlink);
to->di_uid = cpu_to_be32(from->di_uid);
to->di_gid = cpu_to_be32(from->di_gid);
to->di_nlink = cpu_to_be32(from->di_nlink);
to->di_projid = cpu_to_be16(from->di_projid);
memcpy(to->di_pad, from->di_pad, sizeof(to->di_pad));
to->di_flushiter = cpu_to_be16(from->di_flushiter);
to->di_atime.t_sec = cpu_to_be32(from->di_atime.t_sec);
to->di_atime.t_nsec = cpu_to_be32(from->di_atime.t_nsec);
to->di_mtime.t_sec = cpu_to_be32(from->di_mtime.t_sec);
to->di_mtime.t_nsec = cpu_to_be32(from->di_mtime.t_nsec);
to->di_ctime.t_sec = cpu_to_be32(from->di_ctime.t_sec);
to->di_ctime.t_nsec = cpu_to_be32(from->di_ctime.t_nsec);
to->di_size = cpu_to_be64(from->di_size);
to->di_nblocks = cpu_to_be64(from->di_nblocks);
to->di_extsize = cpu_to_be32(from->di_extsize);
to->di_nextents = cpu_to_be32(from->di_nextents);
to->di_anextents = cpu_to_be16(from->di_anextents);
to->di_forkoff = from->di_forkoff;
to->di_aformat = from->di_aformat;
to->di_dmevmask = cpu_to_be32(from->di_dmevmask);
to->di_dmstate = cpu_to_be16(from->di_dmstate);
to->di_flags = cpu_to_be16(from->di_flags);
to->di_gen = cpu_to_be32(from->di_gen);
}
STATIC uint
_xfs_dic2xflags(
__uint16_t di_flags)
{
uint flags = 0;
if (di_flags & XFS_DIFLAG_ANY) {
if (di_flags & XFS_DIFLAG_REALTIME)
flags |= XFS_XFLAG_REALTIME;
if (di_flags & XFS_DIFLAG_PREALLOC)
flags |= XFS_XFLAG_PREALLOC;
if (di_flags & XFS_DIFLAG_IMMUTABLE)
flags |= XFS_XFLAG_IMMUTABLE;
if (di_flags & XFS_DIFLAG_APPEND)
flags |= XFS_XFLAG_APPEND;
if (di_flags & XFS_DIFLAG_SYNC)
flags |= XFS_XFLAG_SYNC;
if (di_flags & XFS_DIFLAG_NOATIME)
flags |= XFS_XFLAG_NOATIME;
if (di_flags & XFS_DIFLAG_NODUMP)
flags |= XFS_XFLAG_NODUMP;
if (di_flags & XFS_DIFLAG_RTINHERIT)
flags |= XFS_XFLAG_RTINHERIT;
if (di_flags & XFS_DIFLAG_PROJINHERIT)
flags |= XFS_XFLAG_PROJINHERIT;
if (di_flags & XFS_DIFLAG_NOSYMLINKS)
flags |= XFS_XFLAG_NOSYMLINKS;
if (di_flags & XFS_DIFLAG_EXTSIZE)
flags |= XFS_XFLAG_EXTSIZE;
if (di_flags & XFS_DIFLAG_EXTSZINHERIT)
flags |= XFS_XFLAG_EXTSZINHERIT;
if (di_flags & XFS_DIFLAG_NODEFRAG)
flags |= XFS_XFLAG_NODEFRAG;
if (di_flags & XFS_DIFLAG_FILESTREAM)
flags |= XFS_XFLAG_FILESTREAM;
}
return flags;
}
uint
xfs_ip2xflags(
xfs_inode_t *ip)
{
xfs_icdinode_t *dic = &ip->i_d;
return _xfs_dic2xflags(dic->di_flags) |
(XFS_IFORK_Q(ip) ? XFS_XFLAG_HASATTR : 0);
}
uint
xfs_dic2xflags(
xfs_dinode_t *dip)
{
return _xfs_dic2xflags(be16_to_cpu(dip->di_flags)) |
(XFS_DFORK_Q(dip) ? XFS_XFLAG_HASATTR : 0);
}
/*
* Read the disk inode attributes into the in-core inode structure.
*/
int
xfs_iread(
xfs_mount_t *mp,
xfs_trans_t *tp,
xfs_inode_t *ip,
xfs_daddr_t bno,
uint iget_flags)
{
xfs_buf_t *bp;
xfs_dinode_t *dip;
int error;
/*
* Fill in the location information in the in-core inode.
*/
ip->i_imap.im_blkno = bno;
error = xfs_imap(mp, tp, ip->i_ino, &ip->i_imap, iget_flags);
if (error)
return error;
ASSERT(bno == 0 || bno == ip->i_imap.im_blkno);
/*
* Get pointers to the on-disk inode and the buffer containing it.
*/
error = xfs_imap_to_bp(mp, tp, &ip->i_imap, &bp,
XBF_LOCK, iget_flags);
if (error)
return error;
dip = (xfs_dinode_t *)xfs_buf_offset(bp, ip->i_imap.im_boffset);
/*
* If we got something that isn't an inode it means someone
* (nfs or dmi) has a stale handle.
*/
if (be16_to_cpu(dip->di_magic) != XFS_DINODE_MAGIC) {
#ifdef DEBUG
xfs_fs_cmn_err(CE_ALERT, mp, "xfs_iread: "
"dip->di_magic (0x%x) != "
"XFS_DINODE_MAGIC (0x%x)",
be16_to_cpu(dip->di_magic),
XFS_DINODE_MAGIC);
#endif /* DEBUG */
error = XFS_ERROR(EINVAL);
goto out_brelse;
}
/*
* If the on-disk inode is already linked to a directory
* entry, copy all of the inode into the in-core inode.
* xfs_iformat() handles copying in the inode format
* specific information.
* Otherwise, just get the truly permanent information.
*/
if (dip->di_mode) {
xfs_dinode_from_disk(&ip->i_d, dip);
error = xfs_iformat(ip, dip);
if (error) {
#ifdef DEBUG
xfs_fs_cmn_err(CE_ALERT, mp, "xfs_iread: "
"xfs_iformat() returned error %d",
error);
#endif /* DEBUG */
goto out_brelse;
}
} else {
ip->i_d.di_magic = be16_to_cpu(dip->di_magic);
ip->i_d.di_version = dip->di_version;
ip->i_d.di_gen = be32_to_cpu(dip->di_gen);
ip->i_d.di_flushiter = be16_to_cpu(dip->di_flushiter);
/*
* Make sure to pull in the mode here as well in
* case the inode is released without being used.
* This ensures that xfs_inactive() will see that
* the inode is already free and not try to mess
* with the uninitialized part of it.
*/
ip->i_d.di_mode = 0;
/*
* Initialize the per-fork minima and maxima for a new
* inode here. xfs_iformat will do it for old inodes.
*/
ip->i_df.if_ext_max =
XFS_IFORK_DSIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t);
}
/*
* The inode format changed when we moved the link count and
* made it 32 bits long. If this is an old format inode,
* convert it in memory to look like a new one. If it gets
* flushed to disk we will convert back before flushing or
* logging it. We zero out the new projid field and the old link
* count field. We'll handle clearing the pad field (the remains
* of the old uuid field) when we actually convert the inode to
* the new format. We don't change the version number so that we
* can distinguish this from a real new format inode.
*/
if (ip->i_d.di_version == 1) {
ip->i_d.di_nlink = ip->i_d.di_onlink;
ip->i_d.di_onlink = 0;
ip->i_d.di_projid = 0;
}
ip->i_delayed_blks = 0;
ip->i_size = ip->i_d.di_size;
/*
* Mark the buffer containing the inode as something to keep
* around for a while. This helps to keep recently accessed
* meta-data in-core longer.
*/
XFS_BUF_SET_REF(bp, XFS_INO_REF);
/*
* Use xfs_trans_brelse() to release the buffer containing the
* on-disk inode, because it was acquired with xfs_trans_read_buf()
* in xfs_itobp() above. If tp is NULL, this is just a normal
* brelse(). If we're within a transaction, then xfs_trans_brelse()
* will only release the buffer if it is not dirty within the
* transaction. It will be OK to release the buffer in this case,
* because inodes on disk are never destroyed and we will be
* locking the new in-core inode before putting it in the hash
* table where other processes can find it. Thus we don't have
* to worry about the inode being changed just because we released
* the buffer.
*/
out_brelse:
xfs_trans_brelse(tp, bp);
return error;
}
/*
* Read in extents from a btree-format inode.
* Allocate and fill in if_extents. Real work is done in xfs_bmap.c.
*/
int
xfs_iread_extents(
xfs_trans_t *tp,
xfs_inode_t *ip,
int whichfork)
{
int error;
xfs_ifork_t *ifp;
xfs_extnum_t nextents;
size_t size;
if (unlikely(XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE)) {
XFS_ERROR_REPORT("xfs_iread_extents", XFS_ERRLEVEL_LOW,
ip->i_mount);
return XFS_ERROR(EFSCORRUPTED);
}
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_lastex = NULLEXTNUM;
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) {
xfs_iext_destroy(ifp);
ifp->if_flags &= ~XFS_IFEXTENTS;
return error;
}
xfs_validate_extents(ifp, nextents, XFS_EXTFMT_INODE(ip));
return 0;
}
/*
* Allocate an inode on disk and return a copy of its in-core version.
* The in-core inode is locked exclusively. Set mode, nlink, and rdev
* appropriately within the inode. The uid and gid for the inode are
* set according to the contents of the given cred structure.
*
* Use xfs_dialloc() to allocate the on-disk inode. If xfs_dialloc()
* has a free inode available, call xfs_iget()
* to obtain the in-core version of the allocated inode. Finally,
* fill in the inode and log its initial contents. In this case,
* ialloc_context would be set to NULL and call_again set to false.
*
* If xfs_dialloc() does not have an available inode,
* it will replenish its supply by doing an allocation. Since we can
* only do one allocation within a transaction without deadlocks, we
* must commit the current transaction before returning the inode itself.
* In this case, therefore, we will set call_again to true and return.
* The caller should then commit the current transaction, start a new
* transaction, and call xfs_ialloc() again to actually get the inode.
*
* To ensure that some other process does not grab the inode that
* was allocated during the first call to xfs_ialloc(), this routine
* also returns the [locked] bp pointing to the head of the freelist
* as ialloc_context. The caller should hold this buffer across
* the commit and pass it back into this routine on the second call.
*
* If we are allocating quota inodes, we do not have a parent inode
* to attach to or associate with (i.e. pip == NULL) because they
* are not linked into the directory structure - they are attached
* directly to the superblock - and so have no parent.
*/
int
xfs_ialloc(
xfs_trans_t *tp,
xfs_inode_t *pip,
mode_t mode,
xfs_nlink_t nlink,
xfs_dev_t rdev,
cred_t *cr,
xfs_prid_t prid,
int okalloc,
xfs_buf_t **ialloc_context,
boolean_t *call_again,
xfs_inode_t **ipp)
{
xfs_ino_t ino;
xfs_inode_t *ip;
uint flags;
int error;
timespec_t tv;
int filestreams = 0;
/*
* Call the space management code to pick
* the on-disk inode to be allocated.
*/
error = xfs_dialloc(tp, pip ? pip->i_ino : 0, mode, okalloc,
ialloc_context, call_again, &ino);
if (error)
return error;
if (*call_again || ino == NULLFSINO) {
*ipp = NULL;
return 0;
}
ASSERT(*ialloc_context == NULL);
/*
* Get the in-core inode with the lock held exclusively.
* This is because we're setting fields here we need
* to prevent others from looking at until we're done.
*/
error = xfs_trans_iget(tp->t_mountp, tp, ino,
XFS_IGET_CREATE, XFS_ILOCK_EXCL, &ip);
if (error)
return error;
ASSERT(ip != NULL);
ip->i_d.di_mode = (__uint16_t)mode;
ip->i_d.di_onlink = 0;
ip->i_d.di_nlink = nlink;
ASSERT(ip->i_d.di_nlink == nlink);
ip->i_d.di_uid = current_fsuid();
ip->i_d.di_gid = current_fsgid();
ip->i_d.di_projid = prid;
memset(&(ip->i_d.di_pad[0]), 0, sizeof(ip->i_d.di_pad));
/*
* If the superblock version is up to where we support new format
* inodes and this is currently an old format inode, then change
* the inode version number now. This way we only do the conversion
* here rather than here and in the flush/logging code.
*/
if (xfs_sb_version_hasnlink(&tp->t_mountp->m_sb) &&
ip->i_d.di_version == 1) {
ip->i_d.di_version = 2;
/*
* We've already zeroed the old link count, the projid field,
* and the pad field.
*/
}
/*
* Project ids won't be stored on disk if we are using a version 1 inode.
*/
if ((prid != 0) && (ip->i_d.di_version == 1))
xfs_bump_ino_vers2(tp, ip);
if (pip && XFS_INHERIT_GID(pip)) {
ip->i_d.di_gid = pip->i_d.di_gid;
if ((pip->i_d.di_mode & S_ISGID) && (mode & S_IFMT) == S_IFDIR) {
ip->i_d.di_mode |= S_ISGID;
}
}
/*
* If the group ID of the new file does not match the effective group
* ID or one of the supplementary group IDs, the S_ISGID bit is cleared
* (and only if the irix_sgid_inherit compatibility variable is set).
*/
if ((irix_sgid_inherit) &&
(ip->i_d.di_mode & S_ISGID) &&
(!in_group_p((gid_t)ip->i_d.di_gid))) {
ip->i_d.di_mode &= ~S_ISGID;
}
ip->i_d.di_size = 0;
ip->i_size = 0;
ip->i_d.di_nextents = 0;
ASSERT(ip->i_d.di_nblocks == 0);
nanotime(&tv);
ip->i_d.di_mtime.t_sec = (__int32_t)tv.tv_sec;
ip->i_d.di_mtime.t_nsec = (__int32_t)tv.tv_nsec;
ip->i_d.di_atime = ip->i_d.di_mtime;
ip->i_d.di_ctime = ip->i_d.di_mtime;
/*
* di_gen will have been taken care of in xfs_iread.
*/
ip->i_d.di_extsize = 0;
ip->i_d.di_dmevmask = 0;
ip->i_d.di_dmstate = 0;
ip->i_d.di_flags = 0;
flags = XFS_ILOG_CORE;
switch (mode & S_IFMT) {
case S_IFIFO:
case S_IFCHR:
case S_IFBLK:
case S_IFSOCK:
ip->i_d.di_format = XFS_DINODE_FMT_DEV;
ip->i_df.if_u2.if_rdev = rdev;
ip->i_df.if_flags = 0;
flags |= XFS_ILOG_DEV;
break;
case S_IFREG:
/*
* we can't set up filestreams until after the VFS inode
* is set up properly.
*/
if (pip && xfs_inode_is_filestream(pip))
filestreams = 1;
/* fall through */
case S_IFDIR:
if (pip && (pip->i_d.di_flags & XFS_DIFLAG_ANY)) {
uint di_flags = 0;
if ((mode & S_IFMT) == S_IFDIR) {
if (pip->i_d.di_flags & XFS_DIFLAG_RTINHERIT)
di_flags |= XFS_DIFLAG_RTINHERIT;
if (pip->i_d.di_flags & XFS_DIFLAG_EXTSZINHERIT) {
di_flags |= XFS_DIFLAG_EXTSZINHERIT;
ip->i_d.di_extsize = pip->i_d.di_extsize;
}
} else if ((mode & S_IFMT) == S_IFREG) {
if (pip->i_d.di_flags & XFS_DIFLAG_RTINHERIT)
di_flags |= XFS_DIFLAG_REALTIME;
if (pip->i_d.di_flags & XFS_DIFLAG_EXTSZINHERIT) {
di_flags |= XFS_DIFLAG_EXTSIZE;
ip->i_d.di_extsize = pip->i_d.di_extsize;
}
}
if ((pip->i_d.di_flags & XFS_DIFLAG_NOATIME) &&
xfs_inherit_noatime)
di_flags |= XFS_DIFLAG_NOATIME;
if ((pip->i_d.di_flags & XFS_DIFLAG_NODUMP) &&
xfs_inherit_nodump)
di_flags |= XFS_DIFLAG_NODUMP;
if ((pip->i_d.di_flags & XFS_DIFLAG_SYNC) &&
xfs_inherit_sync)
di_flags |= XFS_DIFLAG_SYNC;
if ((pip->i_d.di_flags & XFS_DIFLAG_NOSYMLINKS) &&
xfs_inherit_nosymlinks)
di_flags |= XFS_DIFLAG_NOSYMLINKS;
if (pip->i_d.di_flags & XFS_DIFLAG_PROJINHERIT)
di_flags |= XFS_DIFLAG_PROJINHERIT;
if ((pip->i_d.di_flags & XFS_DIFLAG_NODEFRAG) &&
xfs_inherit_nodefrag)
di_flags |= XFS_DIFLAG_NODEFRAG;
if (pip->i_d.di_flags & XFS_DIFLAG_FILESTREAM)
di_flags |= XFS_DIFLAG_FILESTREAM;
ip->i_d.di_flags |= di_flags;
}
/* FALLTHROUGH */
case S_IFLNK:
ip->i_d.di_format = XFS_DINODE_FMT_EXTENTS;
ip->i_df.if_flags = XFS_IFEXTENTS;
ip->i_df.if_bytes = ip->i_df.if_real_bytes = 0;
ip->i_df.if_u1.if_extents = NULL;
break;
default:
ASSERT(0);
}
/*
* Attribute fork settings for new inode.
*/
ip->i_d.di_aformat = XFS_DINODE_FMT_EXTENTS;
ip->i_d.di_anextents = 0;
/*
* Log the new values stuffed into the inode.
*/
xfs_trans_log_inode(tp, ip, flags);
/* now that we have an i_mode we can setup inode ops and unlock */
xfs_setup_inode(ip);
/* now we have set up the vfs inode we can associate the filestream */
if (filestreams) {
error = xfs_filestream_associate(pip, ip);
if (error < 0)
return -error;
if (!error)
xfs_iflags_set(ip, XFS_IFILESTREAM);
}
*ipp = ip;
return 0;
}
/*
* Check to make sure that there are no blocks allocated to the
* file beyond the size of the file. We don't check this for
* files with fixed size extents or real time extents, but we
* at least do it for regular files.
*/
#ifdef DEBUG
void
xfs_isize_check(
xfs_mount_t *mp,
xfs_inode_t *ip,
xfs_fsize_t isize)
{
xfs_fileoff_t map_first;
int nimaps;
xfs_bmbt_irec_t imaps[2];
if ((ip->i_d.di_mode & S_IFMT) != S_IFREG)
return;
if (XFS_IS_REALTIME_INODE(ip))
return;
if (ip->i_d.di_flags & XFS_DIFLAG_EXTSIZE)
return;
nimaps = 2;
map_first = XFS_B_TO_FSB(mp, (xfs_ufsize_t)isize);
/*
* The filesystem could be shutting down, so bmapi may return
* an error.
*/
if (xfs_bmapi(NULL, ip, map_first,
(XFS_B_TO_FSB(mp,
(xfs_ufsize_t)XFS_MAXIOFFSET(mp)) -
map_first),
XFS_BMAPI_ENTIRE, NULL, 0, imaps, &nimaps,
NULL, NULL))
return;
ASSERT(nimaps == 1);
ASSERT(imaps[0].br_startblock == HOLESTARTBLOCK);
}
#endif /* DEBUG */
/*
* Calculate the last possible buffered byte in a file. This must
* include data that was buffered beyond the EOF by the write code.
* This also needs to deal with overflowing the xfs_fsize_t type
* which can happen for sizes near the limit.
*
* We also need to take into account any blocks beyond the EOF. It
* may be the case that they were buffered by a write which failed.
* In that case the pages will still be in memory, but the inode size
* will never have been updated.
*/
STATIC xfs_fsize_t
xfs_file_last_byte(
xfs_inode_t *ip)
{
xfs_mount_t *mp;
xfs_fsize_t last_byte;
xfs_fileoff_t last_block;
xfs_fileoff_t size_last_block;
int error;
ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL|XFS_IOLOCK_SHARED));
mp = ip->i_mount;
/*
* Only check for blocks beyond the EOF if the extents have
* been read in. This eliminates the need for the inode lock,
* and it also saves us from looking when it really isn't
* necessary.
*/
if (ip->i_df.if_flags & XFS_IFEXTENTS) {
xfs_ilock(ip, XFS_ILOCK_SHARED);
error = xfs_bmap_last_offset(NULL, ip, &last_block,
XFS_DATA_FORK);
xfs_iunlock(ip, XFS_ILOCK_SHARED);
if (error) {
last_block = 0;
}
} else {
last_block = 0;
}
size_last_block = XFS_B_TO_FSB(mp, (xfs_ufsize_t)ip->i_size);
last_block = XFS_FILEOFF_MAX(last_block, size_last_block);
last_byte = XFS_FSB_TO_B(mp, last_block);
if (last_byte < 0) {
return XFS_MAXIOFFSET(mp);
}
last_byte += (1 << mp->m_writeio_log);
if (last_byte < 0) {
return XFS_MAXIOFFSET(mp);
}
return last_byte;
}
/*
* Start the truncation of the file to new_size. The new size
* must be smaller than the current size. This routine will
* clear the buffer and page caches of file data in the removed
* range, and xfs_itruncate_finish() will remove the underlying
* disk blocks.
*
* The inode must have its I/O lock locked EXCLUSIVELY, and it
* must NOT have the inode lock held at all. This is because we're
* calling into the buffer/page cache code and we can't hold the
* inode lock when we do so.
*
* We need to wait for any direct I/Os in flight to complete before we
* proceed with the truncate. This is needed to prevent the extents
* being read or written by the direct I/Os from being removed while the
* I/O is in flight as there is no other method of synchronising
* direct I/O with the truncate operation. Also, because we hold
* the IOLOCK in exclusive mode, we prevent new direct I/Os from being
* started until the truncate completes and drops the lock. Essentially,
* the xfs_ioend_wait() call forms an I/O barrier that provides strict
* ordering between direct I/Os and the truncate operation.
*
* The flags parameter can have either the value XFS_ITRUNC_DEFINITE
* or XFS_ITRUNC_MAYBE. The XFS_ITRUNC_MAYBE value should be used
* in the case that the caller is locking things out of order and
* may not be able to call xfs_itruncate_finish() with the inode lock
* held without dropping the I/O lock. If the caller must drop the
* I/O lock before calling xfs_itruncate_finish(), then xfs_itruncate_start()
* must be called again with all the same restrictions as the initial
* call.
*/
int
xfs_itruncate_start(
xfs_inode_t *ip,
uint flags,
xfs_fsize_t new_size)
{
xfs_fsize_t last_byte;
xfs_off_t toss_start;
xfs_mount_t *mp;
int error = 0;
ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL));
ASSERT((new_size == 0) || (new_size <= ip->i_size));
ASSERT((flags == XFS_ITRUNC_DEFINITE) ||
(flags == XFS_ITRUNC_MAYBE));
mp = ip->i_mount;
/* wait for the completion of any pending DIOs */
if (new_size == 0 || new_size < ip->i_size)
xfs_ioend_wait(ip);
/*
* Call toss_pages or flushinval_pages to get rid of pages
* overlapping the region being removed. We have to use
* the less efficient flushinval_pages in the case that the
* caller may not be able to finish the truncate without
* dropping the inode's I/O lock. Make sure
* to catch any pages brought in by buffers overlapping
* the EOF by searching out beyond the isize by our
* block size. We round new_size up to a block boundary
* so that we don't toss things on the same block as
* new_size but before it.
*
* Before calling toss_page or flushinval_pages, make sure to
* call remapf() over the same region if the file is mapped.
* This frees up mapped file references to the pages in the
* given range and for the flushinval_pages case it ensures
* that we get the latest mapped changes flushed out.
*/
toss_start = XFS_B_TO_FSB(mp, (xfs_ufsize_t)new_size);
toss_start = XFS_FSB_TO_B(mp, toss_start);
if (toss_start < 0) {
/*
* The place to start tossing is beyond our maximum
* file size, so there is no way that the data extended
* out there.
*/
return 0;
}
last_byte = xfs_file_last_byte(ip);
trace_xfs_itruncate_start(ip, flags, new_size, toss_start, last_byte);
if (last_byte > toss_start) {
if (flags & XFS_ITRUNC_DEFINITE) {
xfs_tosspages(ip, toss_start,
-1, FI_REMAPF_LOCKED);
} else {
error = xfs_flushinval_pages(ip, toss_start,
-1, FI_REMAPF_LOCKED);
}
}
#ifdef DEBUG
if (new_size == 0) {
ASSERT(VN_CACHED(VFS_I(ip)) == 0);
}
#endif
return error;
}
/*
* Shrink the file to the given new_size. The new size must be smaller than
* the current size. This will free up the underlying blocks in the removed
* range after a call to xfs_itruncate_start() or xfs_atruncate_start().
*
* The transaction passed to this routine must have made a permanent log
* reservation of at least XFS_ITRUNCATE_LOG_RES. This routine may commit the
* given transaction and start new ones, so make sure everything involved in
* the transaction is tidy before calling here. Some transaction will be
* returned to the caller to be committed. The incoming transaction must
* already include the inode, and both inode locks must be held exclusively.
* The inode must also be "held" within the transaction. On return the inode
* will be "held" within the returned transaction. This routine does NOT
* require any disk space to be reserved for it within the transaction.
*
* The fork parameter must be either xfs_attr_fork or xfs_data_fork, and it
* indicates the fork which is to be truncated. For the attribute fork we only
* support truncation to size 0.
*
* We use the sync parameter to indicate whether or not the first transaction
* we perform might have to be synchronous. For the attr fork, it needs to be
* so if the unlink of the inode is not yet known to be permanent in the log.
* This keeps us from freeing and reusing the blocks of the attribute fork
* before the unlink of the inode becomes permanent.
*
* For the data fork, we normally have to run synchronously if we're being
* called out of the inactive path or we're being called out of the create path
* where we're truncating an existing file. Either way, the truncate needs to
* be sync so blocks don't reappear in the file with altered data in case of a
* crash. wsync filesystems can run the first case async because anything that
* shrinks the inode has to run sync so by the time we're called here from
* inactive, the inode size is permanently set to 0.
*
* Calls from the truncate path always need to be sync unless we're in a wsync
* filesystem and the file has already been unlinked.
*
* The caller is responsible for correctly setting the sync parameter. It gets
* too hard for us to guess here which path we're being called out of just
* based on inode state.
*
* If we get an error, we must return with the inode locked and linked into the
* current transaction. This keeps things simple for the higher level code,
* because it always knows that the inode is locked and held in the transaction
* that returns to it whether errors occur or not. We don't mark the inode
* dirty on error so that transactions can be easily aborted if possible.
*/
int
xfs_itruncate_finish(
xfs_trans_t **tp,
xfs_inode_t *ip,
xfs_fsize_t new_size,
int fork,
int sync)
{
xfs_fsblock_t first_block;
xfs_fileoff_t first_unmap_block;
xfs_fileoff_t last_block;
xfs_filblks_t unmap_len=0;
xfs_mount_t *mp;
xfs_trans_t *ntp;
int done;
int committed;
xfs_bmap_free_t free_list;
int error;
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_IOLOCK_EXCL));
ASSERT((new_size == 0) || (new_size <= ip->i_size));
ASSERT(*tp != NULL);
ASSERT((*tp)->t_flags & XFS_TRANS_PERM_LOG_RES);
ASSERT(ip->i_transp == *tp);
ASSERT(ip->i_itemp != NULL);
ASSERT(ip->i_itemp->ili_flags & XFS_ILI_HOLD);
ntp = *tp;
mp = (ntp)->t_mountp;
ASSERT(! XFS_NOT_DQATTACHED(mp, ip));
/*
* We only support truncating the entire attribute fork.
*/
if (fork == XFS_ATTR_FORK) {
new_size = 0LL;
}
first_unmap_block = XFS_B_TO_FSB(mp, (xfs_ufsize_t)new_size);
trace_xfs_itruncate_finish_start(ip, new_size);
/*
* The first thing we do is set the size to new_size permanently
* on disk. This way we don't have to worry about anyone ever
* being able to look at the data being freed even in the face
* of a crash. What we're getting around here is the case where
* we free a block, it is allocated to another file, it is written
* to, and then we crash. If the new data gets written to the
* file but the log buffers containing the free and reallocation
* don't, then we'd end up with garbage in the blocks being freed.
* As long as we make the new_size permanent before actually
* freeing any blocks it doesn't matter if they get writtten to.
*
* The callers must signal into us whether or not the size
* setting here must be synchronous. There are a few cases
* where it doesn't have to be synchronous. Those cases
* occur if the file is unlinked and we know the unlink is
* permanent or if the blocks being truncated are guaranteed
* to be beyond the inode eof (regardless of the link count)
* and the eof value is permanent. Both of these cases occur
* only on wsync-mounted filesystems. In those cases, we're
* guaranteed that no user will ever see the data in the blocks
* that are being truncated so the truncate can run async.
* In the free beyond eof case, the file may wind up with
* more blocks allocated to it than it needs if we crash
* and that won't get fixed until the next time the file
* is re-opened and closed but that's ok as that shouldn't
* be too many blocks.
*
* However, we can't just make all wsync xactions run async
* because there's one call out of the create path that needs
* to run sync where it's truncating an existing file to size
* 0 whose size is > 0.
*
* It's probably possible to come up with a test in this
* routine that would correctly distinguish all the above
* cases from the values of the function parameters and the
* inode state but for sanity's sake, I've decided to let the
* layers above just tell us. It's simpler to correctly figure
* out in the layer above exactly under what conditions we
* can run async and I think it's easier for others read and
* follow the logic in case something has to be changed.
* cscope is your friend -- rcc.
*
* The attribute fork is much simpler.
*
* For the attribute fork we allow the caller to tell us whether
* the unlink of the inode that led to this call is yet permanent
* in the on disk log. If it is not and we will be freeing extents
* in this inode then we make the first transaction synchronous
* to make sure that the unlink is permanent by the time we free
* the blocks.
*/
if (fork == XFS_DATA_FORK) {
if (ip->i_d.di_nextents > 0) {
/*
* If we are not changing the file size then do
* not update the on-disk file size - we may be
* called from xfs_inactive_free_eofblocks(). If we
* update the on-disk file size and then the system
* crashes before the contents of the file are
* flushed to disk then the files may be full of
* holes (ie NULL files bug).
*/
if (ip->i_size != new_size) {
ip->i_d.di_size = new_size;
ip->i_size = new_size;
xfs_trans_log_inode(ntp, ip, XFS_ILOG_CORE);
}
}
} else if (sync) {
ASSERT(!(mp->m_flags & XFS_MOUNT_WSYNC));
if (ip->i_d.di_anextents > 0)
xfs_trans_set_sync(ntp);
}
ASSERT(fork == XFS_DATA_FORK ||
(fork == XFS_ATTR_FORK &&
((sync && !(mp->m_flags & XFS_MOUNT_WSYNC)) ||
(sync == 0 && (mp->m_flags & XFS_MOUNT_WSYNC)))));
/*
* Since it is possible for space to become allocated beyond
* the end of the file (in a crash where the space is allocated
* but the inode size is not yet updated), simply remove any
* blocks which show up between the new EOF and the maximum
* possible file size. If the first block to be removed is
* beyond the maximum file size (ie it is the same as last_block),
* then there is nothing to do.
*/
last_block = XFS_B_TO_FSB(mp, (xfs_ufsize_t)XFS_MAXIOFFSET(mp));
ASSERT(first_unmap_block <= last_block);
done = 0;
if (last_block == first_unmap_block) {
done = 1;
} else {
unmap_len = last_block - first_unmap_block + 1;
}
while (!done) {
/*
* Free up up to XFS_ITRUNC_MAX_EXTENTS. xfs_bunmapi()
* will tell us whether it freed the entire range or
* not. If this is a synchronous mount (wsync),
* then we can tell bunmapi to keep all the
* transactions asynchronous since the unlink
* transaction that made this inode inactive has
* already hit the disk. There's no danger of
* the freed blocks being reused, there being a
* crash, and the reused blocks suddenly reappearing
* in this file with garbage in them once recovery
* runs.
*/
xfs_bmap_init(&free_list, &first_block);
error = xfs_bunmapi(ntp, ip,
first_unmap_block, unmap_len,
xfs_bmapi_aflag(fork) |
(sync ? 0 : XFS_BMAPI_ASYNC),
XFS_ITRUNC_MAX_EXTENTS,
&first_block, &free_list,
NULL, &done);
if (error) {
/*
* If the bunmapi call encounters an error,
* return to the caller where the transaction
* can be properly aborted. We just need to
* make sure we're not holding any resources
* that we were not when we came in.
*/
xfs_bmap_cancel(&free_list);
return error;
}
/*
* Duplicate the transaction that has the permanent
* reservation and commit the old transaction.
*/
error = xfs_bmap_finish(tp, &free_list, &committed);
ntp = *tp;
if (committed) {
/* link the inode into the next xact in the chain */
xfs_trans_ijoin(ntp, ip,
XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);
xfs_trans_ihold(ntp, ip);
}
if (error) {
/*
* If the bmap finish call encounters an error, return
* to the caller where the transaction can be properly
* aborted. We just need to make sure we're not
* holding any resources that we were not when we came
* in.
*
* Aborting from this point might lose some blocks in
* the file system, but oh well.
*/
xfs_bmap_cancel(&free_list);
return error;
}
if (committed) {
/*
* Mark the inode dirty so it will be logged and
* moved forward in the log as part of every commit.
*/
xfs_trans_log_inode(ntp, ip, XFS_ILOG_CORE);
}
ntp = xfs_trans_dup(ntp);
error = xfs_trans_commit(*tp, 0);
*tp = ntp;
/* link the inode into the next transaction in the chain */
xfs_trans_ijoin(ntp, ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);
xfs_trans_ihold(ntp, ip);
if (error)
return error;
/*
* transaction commit worked ok so we can drop the extra ticket
* reference that we gained in xfs_trans_dup()
*/
xfs_log_ticket_put(ntp->t_ticket);
error = xfs_trans_reserve(ntp, 0,
XFS_ITRUNCATE_LOG_RES(mp), 0,
XFS_TRANS_PERM_LOG_RES,
XFS_ITRUNCATE_LOG_COUNT);
if (error)
return error;
}
/*
* Only update the size in the case of the data fork, but
* always re-log the inode so that our permanent transaction
* can keep on rolling it forward in the log.
*/
if (fork == XFS_DATA_FORK) {
xfs_isize_check(mp, ip, new_size);
/*
* If we are not changing the file size then do
* not update the on-disk file size - we may be
* called from xfs_inactive_free_eofblocks(). If we
* update the on-disk file size and then the system
* crashes before the contents of the file are
* flushed to disk then the files may be full of
* holes (ie NULL files bug).
*/
if (ip->i_size != new_size) {
ip->i_d.di_size = new_size;
ip->i_size = new_size;
}
}
xfs_trans_log_inode(ntp, ip, XFS_ILOG_CORE);
ASSERT((new_size != 0) ||
(fork == XFS_ATTR_FORK) ||
(ip->i_delayed_blks == 0));
ASSERT((new_size != 0) ||
(fork == XFS_ATTR_FORK) ||
(ip->i_d.di_nextents == 0));
trace_xfs_itruncate_finish_end(ip, new_size);
return 0;
}
/*
* This is called when the inode's link count goes to 0.
* We place the on-disk inode on a list in the AGI. It
* will be pulled from this list when the inode is freed.
*/
int
xfs_iunlink(
xfs_trans_t *tp,
xfs_inode_t *ip)
{
xfs_mount_t *mp;
xfs_agi_t *agi;
xfs_dinode_t *dip;
xfs_buf_t *agibp;
xfs_buf_t *ibp;
xfs_agino_t agino;
short bucket_index;
int offset;
int error;
ASSERT(ip->i_d.di_nlink == 0);
ASSERT(ip->i_d.di_mode != 0);
ASSERT(ip->i_transp == tp);
mp = tp->t_mountp;
/*
* Get the agi buffer first. It ensures lock ordering
* on the list.
*/
error = xfs_read_agi(mp, tp, XFS_INO_TO_AGNO(mp, ip->i_ino), &agibp);
if (error)
return error;
agi = XFS_BUF_TO_AGI(agibp);
/*
* Get the index into the agi hash table for the
* list this inode will go on.
*/
agino = XFS_INO_TO_AGINO(mp, ip->i_ino);
ASSERT(agino != 0);
bucket_index = agino % XFS_AGI_UNLINKED_BUCKETS;
ASSERT(agi->agi_unlinked[bucket_index]);
ASSERT(be32_to_cpu(agi->agi_unlinked[bucket_index]) != agino);
if (be32_to_cpu(agi->agi_unlinked[bucket_index]) != NULLAGINO) {
/*
* There is already another inode in the bucket we need
* to add ourselves to. Add us at the front of the list.
* Here we put the head pointer into our next pointer,
* and then we fall through to point the head at us.
*/
error = xfs_itobp(mp, tp, ip, &dip, &ibp, XBF_LOCK);
if (error)
return error;
ASSERT(be32_to_cpu(dip->di_next_unlinked) == NULLAGINO);
/* both on-disk, don't endian flip twice */
dip->di_next_unlinked = agi->agi_unlinked[bucket_index];
offset = ip->i_imap.im_boffset +
offsetof(xfs_dinode_t, di_next_unlinked);
xfs_trans_inode_buf(tp, ibp);
xfs_trans_log_buf(tp, ibp, offset,
(offset + sizeof(xfs_agino_t) - 1));
xfs_inobp_check(mp, ibp);
}
/*
* Point the bucket head pointer at the inode being inserted.
*/
ASSERT(agino != 0);
agi->agi_unlinked[bucket_index] = cpu_to_be32(agino);
offset = offsetof(xfs_agi_t, agi_unlinked) +
(sizeof(xfs_agino_t) * bucket_index);
xfs_trans_log_buf(tp, agibp, offset,
(offset + sizeof(xfs_agino_t) - 1));
return 0;
}
/*
* Pull the on-disk inode from the AGI unlinked list.
*/
STATIC int
xfs_iunlink_remove(
xfs_trans_t *tp,
xfs_inode_t *ip)
{
xfs_ino_t next_ino;
xfs_mount_t *mp;
xfs_agi_t *agi;
xfs_dinode_t *dip;
xfs_buf_t *agibp;
xfs_buf_t *ibp;
xfs_agnumber_t agno;
xfs_agino_t agino;
xfs_agino_t next_agino;
xfs_buf_t *last_ibp;
xfs_dinode_t *last_dip = NULL;
short bucket_index;
int offset, last_offset = 0;
int error;
mp = tp->t_mountp;
agno = XFS_INO_TO_AGNO(mp, ip->i_ino);
/*
* Get the agi buffer first. It ensures lock ordering
* on the list.
*/
error = xfs_read_agi(mp, tp, agno, &agibp);
if (error)
return error;
agi = XFS_BUF_TO_AGI(agibp);
/*
* Get the index into the agi hash table for the
* list this inode will go on.
*/
agino = XFS_INO_TO_AGINO(mp, ip->i_ino);
ASSERT(agino != 0);
bucket_index = agino % XFS_AGI_UNLINKED_BUCKETS;
ASSERT(be32_to_cpu(agi->agi_unlinked[bucket_index]) != NULLAGINO);
ASSERT(agi->agi_unlinked[bucket_index]);
if (be32_to_cpu(agi->agi_unlinked[bucket_index]) == agino) {
/*
* We're at the head of the list. Get the inode's
* on-disk buffer to see if there is anyone after us
* on the list. Only modify our next pointer if it
* is not already NULLAGINO. This saves us the overhead
* of dealing with the buffer when there is no need to
* change it.
*/
error = xfs_itobp(mp, tp, ip, &dip, &ibp, XBF_LOCK);
if (error) {
cmn_err(CE_WARN,
"xfs_iunlink_remove: xfs_itobp() returned an error %d on %s. Returning error.",
error, mp->m_fsname);
return error;
}
next_agino = be32_to_cpu(dip->di_next_unlinked);
ASSERT(next_agino != 0);
if (next_agino != NULLAGINO) {
dip->di_next_unlinked = cpu_to_be32(NULLAGINO);
offset = ip->i_imap.im_boffset +
offsetof(xfs_dinode_t, di_next_unlinked);
xfs_trans_inode_buf(tp, ibp);
xfs_trans_log_buf(tp, ibp, offset,
(offset + sizeof(xfs_agino_t) - 1));
xfs_inobp_check(mp, ibp);
} else {
xfs_trans_brelse(tp, ibp);
}
/*
* Point the bucket head pointer at the next inode.
*/
ASSERT(next_agino != 0);
ASSERT(next_agino != agino);
agi->agi_unlinked[bucket_index] = cpu_to_be32(next_agino);
offset = offsetof(xfs_agi_t, agi_unlinked) +
(sizeof(xfs_agino_t) * bucket_index);
xfs_trans_log_buf(tp, agibp, offset,
(offset + sizeof(xfs_agino_t) - 1));
} else {
/*
* We need to search the list for the inode being freed.
*/
next_agino = be32_to_cpu(agi->agi_unlinked[bucket_index]);
last_ibp = NULL;
while (next_agino != agino) {
/*
* If the last inode wasn't the one pointing to
* us, then release its buffer since we're not
* going to do anything with it.
*/
if (last_ibp != NULL) {
xfs_trans_brelse(tp, last_ibp);
}
next_ino = XFS_AGINO_TO_INO(mp, agno, next_agino);
error = xfs_inotobp(mp, tp, next_ino, &last_dip,
&last_ibp, &last_offset, 0);
if (error) {
cmn_err(CE_WARN,
"xfs_iunlink_remove: xfs_inotobp() returned an error %d on %s. Returning error.",
error, mp->m_fsname);
return error;
}
next_agino = be32_to_cpu(last_dip->di_next_unlinked);
ASSERT(next_agino != NULLAGINO);
ASSERT(next_agino != 0);
}
/*
* Now last_ibp points to the buffer previous to us on
* the unlinked list. Pull us from the list.
*/
error = xfs_itobp(mp, tp, ip, &dip, &ibp, XBF_LOCK);
if (error) {
cmn_err(CE_WARN,
"xfs_iunlink_remove: xfs_itobp() returned an error %d on %s. Returning error.",
error, mp->m_fsname);
return error;
}
next_agino = be32_to_cpu(dip->di_next_unlinked);
ASSERT(next_agino != 0);
ASSERT(next_agino != agino);
if (next_agino != NULLAGINO) {
dip->di_next_unlinked = cpu_to_be32(NULLAGINO);
offset = ip->i_imap.im_boffset +
offsetof(xfs_dinode_t, di_next_unlinked);
xfs_trans_inode_buf(tp, ibp);
xfs_trans_log_buf(tp, ibp, offset,
(offset + sizeof(xfs_agino_t) - 1));
xfs_inobp_check(mp, ibp);
} else {
xfs_trans_brelse(tp, ibp);
}
/*
* Point the previous inode on the list to the next inode.
*/
last_dip->di_next_unlinked = cpu_to_be32(next_agino);
ASSERT(next_agino != 0);
offset = last_offset + offsetof(xfs_dinode_t, di_next_unlinked);
xfs_trans_inode_buf(tp, last_ibp);
xfs_trans_log_buf(tp, last_ibp, offset,
(offset + sizeof(xfs_agino_t) - 1));
xfs_inobp_check(mp, last_ibp);
}
return 0;
}
STATIC void
xfs_ifree_cluster(
xfs_inode_t *free_ip,
xfs_trans_t *tp,
xfs_ino_t inum)
{
xfs_mount_t *mp = free_ip->i_mount;
int blks_per_cluster;
int nbufs;
int ninodes;
int i, j, found, pre_flushed;
xfs_daddr_t blkno;
xfs_buf_t *bp;
xfs_inode_t *ip, **ip_found;
xfs_inode_log_item_t *iip;
xfs_log_item_t *lip;
struct xfs_perag *pag;
pag = xfs_perag_get(mp, XFS_INO_TO_AGNO(mp, inum));
if (mp->m_sb.sb_blocksize >= XFS_INODE_CLUSTER_SIZE(mp)) {
blks_per_cluster = 1;
ninodes = mp->m_sb.sb_inopblock;
nbufs = XFS_IALLOC_BLOCKS(mp);
} else {
blks_per_cluster = XFS_INODE_CLUSTER_SIZE(mp) /
mp->m_sb.sb_blocksize;
ninodes = blks_per_cluster * mp->m_sb.sb_inopblock;
nbufs = XFS_IALLOC_BLOCKS(mp) / blks_per_cluster;
}
ip_found = kmem_alloc(ninodes * sizeof(xfs_inode_t *), KM_NOFS);
for (j = 0; j < nbufs; j++, inum += ninodes) {
blkno = XFS_AGB_TO_DADDR(mp, XFS_INO_TO_AGNO(mp, inum),
XFS_INO_TO_AGBNO(mp, inum));
/*
* Look for each inode in memory and attempt to lock it,
* we can be racing with flush and tail pushing here.
* any inode we get the locks on, add to an array of
* inode items to process later.
*
* The get the buffer lock, we could beat a flush
* or tail pushing thread to the lock here, in which
* case they will go looking for the inode buffer
* and fail, we need some other form of interlock
* here.
*/
found = 0;
for (i = 0; i < ninodes; i++) {
read_lock(&pag->pag_ici_lock);
ip = radix_tree_lookup(&pag->pag_ici_root,
XFS_INO_TO_AGINO(mp, (inum + i)));
/* Inode not in memory or we found it already,
* nothing to do
*/
if (!ip || xfs_iflags_test(ip, XFS_ISTALE)) {
read_unlock(&pag->pag_ici_lock);
continue;
}
if (xfs_inode_clean(ip)) {
read_unlock(&pag->pag_ici_lock);
continue;
}
/* If we can get the locks then add it to the
* list, otherwise by the time we get the bp lock
* below it will already be attached to the
* inode buffer.
*/
/* This inode will already be locked - by us, lets
* keep it that way.
*/
if (ip == free_ip) {
if (xfs_iflock_nowait(ip)) {
xfs_iflags_set(ip, XFS_ISTALE);
if (xfs_inode_clean(ip)) {
xfs_ifunlock(ip);
} else {
ip_found[found++] = ip;
}
}
read_unlock(&pag->pag_ici_lock);
continue;
}
if (xfs_ilock_nowait(ip, XFS_ILOCK_EXCL)) {
if (xfs_iflock_nowait(ip)) {
xfs_iflags_set(ip, XFS_ISTALE);
if (xfs_inode_clean(ip)) {
xfs_ifunlock(ip);
xfs_iunlock(ip, XFS_ILOCK_EXCL);
} else {
ip_found[found++] = ip;
}
} else {
xfs_iunlock(ip, XFS_ILOCK_EXCL);
}
}
read_unlock(&pag->pag_ici_lock);
}
bp = xfs_trans_get_buf(tp, mp->m_ddev_targp, blkno,
mp->m_bsize * blks_per_cluster,
XBF_LOCK);
pre_flushed = 0;
lip = XFS_BUF_FSPRIVATE(bp, xfs_log_item_t *);
while (lip) {
if (lip->li_type == XFS_LI_INODE) {
iip = (xfs_inode_log_item_t *)lip;
ASSERT(iip->ili_logged == 1);
lip->li_cb = (void(*)(xfs_buf_t*,xfs_log_item_t*)) xfs_istale_done;
xfs_trans_ail_copy_lsn(mp->m_ail,
&iip->ili_flush_lsn,
&iip->ili_item.li_lsn);
xfs_iflags_set(iip->ili_inode, XFS_ISTALE);
pre_flushed++;
}
lip = lip->li_bio_list;
}
for (i = 0; i < found; i++) {
ip = ip_found[i];
iip = ip->i_itemp;
if (!iip) {
ip->i_update_core = 0;
xfs_ifunlock(ip);
xfs_iunlock(ip, XFS_ILOCK_EXCL);
continue;
}
iip->ili_last_fields = iip->ili_format.ilf_fields;
iip->ili_format.ilf_fields = 0;
iip->ili_logged = 1;
xfs_trans_ail_copy_lsn(mp->m_ail, &iip->ili_flush_lsn,
&iip->ili_item.li_lsn);
xfs_buf_attach_iodone(bp,
(void(*)(xfs_buf_t*,xfs_log_item_t*))
xfs_istale_done, (xfs_log_item_t *)iip);
if (ip != free_ip) {
xfs_iunlock(ip, XFS_ILOCK_EXCL);
}
}
if (found || pre_flushed)
xfs_trans_stale_inode_buf(tp, bp);
xfs_trans_binval(tp, bp);
}
kmem_free(ip_found);
xfs_perag_put(pag);
}
/*
* This is called to return an inode to the inode free list.
* The inode should already be truncated to 0 length and have
* no pages associated with it. This routine also assumes that
* the inode is already a part of the transaction.
*
* The on-disk copy of the inode will have been added to the list
* of unlinked inodes in the AGI. We need to remove the inode from
* that list atomically with respect to freeing it here.
*/
int
xfs_ifree(
xfs_trans_t *tp,
xfs_inode_t *ip,
xfs_bmap_free_t *flist)
{
int error;
int delete;
xfs_ino_t first_ino;
xfs_dinode_t *dip;
xfs_buf_t *ibp;
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
ASSERT(ip->i_transp == tp);
ASSERT(ip->i_d.di_nlink == 0);
ASSERT(ip->i_d.di_nextents == 0);
ASSERT(ip->i_d.di_anextents == 0);
ASSERT((ip->i_d.di_size == 0 && ip->i_size == 0) ||
((ip->i_d.di_mode & S_IFMT) != S_IFREG));
ASSERT(ip->i_d.di_nblocks == 0);
/*
* Pull the on-disk inode from the AGI unlinked list.
*/
error = xfs_iunlink_remove(tp, ip);
if (error != 0) {
return error;
}
error = xfs_difree(tp, ip->i_ino, flist, &delete, &first_ino);
if (error != 0) {
return error;
}
ip->i_d.di_mode = 0; /* mark incore inode as free */
ip->i_d.di_flags = 0;
ip->i_d.di_dmevmask = 0;
ip->i_d.di_forkoff = 0; /* mark the attr fork not in use */
ip->i_df.if_ext_max =
XFS_IFORK_DSIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t);
ip->i_d.di_format = XFS_DINODE_FMT_EXTENTS;
ip->i_d.di_aformat = XFS_DINODE_FMT_EXTENTS;
/*
* Bump the generation count so no one will be confused
* by reincarnations of this inode.
*/
ip->i_d.di_gen++;
xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
error = xfs_itobp(ip->i_mount, tp, ip, &dip, &ibp, XBF_LOCK);
if (error)
return error;
/*
* Clear the on-disk di_mode. This is to prevent xfs_bulkstat
* from picking up this inode when it is reclaimed (its incore state
* initialzed but not flushed to disk yet). The in-core di_mode is
* already cleared and a corresponding transaction logged.
* The hack here just synchronizes the in-core to on-disk
* di_mode value in advance before the actual inode sync to disk.
* This is OK because the inode is already unlinked and would never
* change its di_mode again for this inode generation.
* This is a temporary hack that would require a proper fix
* in the future.
*/
dip->di_mode = 0;
if (delete) {
xfs_ifree_cluster(ip, tp, first_ino);
}
return 0;
}
/*
* Reallocate the space for if_broot based on the number of records
* being added or deleted as indicated in rec_diff. Move the records
* and pointers in if_broot to fit the new size. When shrinking this
* will eliminate holes between the records and pointers created by
* the caller. When growing this will create holes to be filled in
* by the caller.
*
* The caller must not request to add more records than would fit in
* the on-disk inode root. If the if_broot is currently NULL, then
* if we adding records one will be allocated. The caller must also
* not request that the number of records go below zero, although
* it can go to zero.
*
* ip -- the inode whose if_broot area is changing
* ext_diff -- the change in the number of records, positive or negative,
* requested for the if_broot array.
*/
void
xfs_iroot_realloc(
xfs_inode_t *ip,
int rec_diff,
int whichfork)
{
struct xfs_mount *mp = ip->i_mount;
int cur_max;
xfs_ifork_t *ifp;
struct xfs_btree_block *new_broot;
int new_max;
size_t new_size;
char *np;
char *op;
/*
* Handle the degenerate case quietly.
*/
if (rec_diff == 0) {
return;
}
ifp = XFS_IFORK_PTR(ip, whichfork);
if (rec_diff > 0) {
/*
* If there wasn't any memory allocated before, just
* allocate it now and get out.
*/
if (ifp->if_broot_bytes == 0) {
new_size = (size_t)XFS_BMAP_BROOT_SPACE_CALC(rec_diff);
ifp->if_broot = kmem_alloc(new_size, KM_SLEEP);
ifp->if_broot_bytes = (int)new_size;
return;
}
/*
* If there is already an existing if_broot, then we need
* to realloc() it and shift the pointers to their new
* location. The records don't change location because
* they are kept butted up against the btree block header.
*/
cur_max = xfs_bmbt_maxrecs(mp, ifp->if_broot_bytes, 0);
new_max = cur_max + rec_diff;
new_size = (size_t)XFS_BMAP_BROOT_SPACE_CALC(new_max);
ifp->if_broot = kmem_realloc(ifp->if_broot, new_size,
(size_t)XFS_BMAP_BROOT_SPACE_CALC(cur_max), /* old size */
KM_SLEEP);
op = (char *)XFS_BMAP_BROOT_PTR_ADDR(mp, ifp->if_broot, 1,
ifp->if_broot_bytes);
np = (char *)XFS_BMAP_BROOT_PTR_ADDR(mp, ifp->if_broot, 1,
(int)new_size);
ifp->if_broot_bytes = (int)new_size;
ASSERT(ifp->if_broot_bytes <=
XFS_IFORK_SIZE(ip, whichfork) + XFS_BROOT_SIZE_ADJ);
memmove(np, op, cur_max * (uint)sizeof(xfs_dfsbno_t));
return;
}
/*
* rec_diff is less than 0. In this case, we are shrinking the
* if_broot buffer. It must already exist. If we go to zero
* records, just get rid of the root and clear the status bit.
*/
ASSERT((ifp->if_broot != NULL) && (ifp->if_broot_bytes > 0));
cur_max = xfs_bmbt_maxrecs(mp, ifp->if_broot_bytes, 0);
new_max = cur_max + rec_diff;
ASSERT(new_max >= 0);
if (new_max > 0)
new_size = (size_t)XFS_BMAP_BROOT_SPACE_CALC(new_max);
else
new_size = 0;
if (new_size > 0) {
new_broot = kmem_alloc(new_size, KM_SLEEP);
/*
* First copy over the btree block header.
*/
memcpy(new_broot, ifp->if_broot, XFS_BTREE_LBLOCK_LEN);
} else {
new_broot = NULL;
ifp->if_flags &= ~XFS_IFBROOT;
}
/*
* Only copy the records and pointers if there are any.
*/
if (new_max > 0) {
/*
* First copy the records.
*/
op = (char *)XFS_BMBT_REC_ADDR(mp, ifp->if_broot, 1);
np = (char *)XFS_BMBT_REC_ADDR(mp, new_broot, 1);
memcpy(np, op, new_max * (uint)sizeof(xfs_bmbt_rec_t));
/*
* Then copy the pointers.
*/
op = (char *)XFS_BMAP_BROOT_PTR_ADDR(mp, ifp->if_broot, 1,
ifp->if_broot_bytes);
np = (char *)XFS_BMAP_BROOT_PTR_ADDR(mp, new_broot, 1,
(int)new_size);
memcpy(np, op, new_max * (uint)sizeof(xfs_dfsbno_t));
}
kmem_free(ifp->if_broot);
ifp->if_broot = new_broot;
ifp->if_broot_bytes = (int)new_size;
ASSERT(ifp->if_broot_bytes <=
XFS_IFORK_SIZE(ip, whichfork) + XFS_BROOT_SIZE_ADJ);
return;
}
/*
* This is called when the amount of space needed for if_data
* is increased or decreased. The change in size is indicated by
* the number of bytes that need to be added or deleted in the
* byte_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_data area is changing
* byte_diff -- the change in the number of bytes, positive or negative,
* requested for the if_data array.
*/
void
xfs_idata_realloc(
xfs_inode_t *ip,
int byte_diff,
int whichfork)
{
xfs_ifork_t *ifp;
int new_size;
int real_size;
if (byte_diff == 0) {
return;
}
ifp = XFS_IFORK_PTR(ip, whichfork);
new_size = (int)ifp->if_bytes + byte_diff;
ASSERT(new_size >= 0);
if (new_size == 0) {
if (ifp->if_u1.if_data != ifp->if_u2.if_inline_data) {
kmem_free(ifp->if_u1.if_data);
}
ifp->if_u1.if_data = NULL;
real_size = 0;
} else if (new_size <= sizeof(ifp->if_u2.if_inline_data)) {
/*
* If the valid extents/data can fit in if_inline_ext/data,
* copy them from the malloc'd vector and free it.
*/
if (ifp->if_u1.if_data == NULL) {
ifp->if_u1.if_data = ifp->if_u2.if_inline_data;
} else if (ifp->if_u1.if_data != ifp->if_u2.if_inline_data) {
ASSERT(ifp->if_real_bytes != 0);
memcpy(ifp->if_u2.if_inline_data, ifp->if_u1.if_data,
new_size);
kmem_free(ifp->if_u1.if_data);
ifp->if_u1.if_data = ifp->if_u2.if_inline_data;
}
real_size = 0;
} else {
/*
* Stuck with malloc/realloc.
* For inline data, the underlying buffer must be
* a multiple of 4 bytes in size so that it can be
* logged and stay on word boundaries. We enforce
* that here.
*/
real_size = roundup(new_size, 4);
if (ifp->if_u1.if_data == NULL) {
ASSERT(ifp->if_real_bytes == 0);
ifp->if_u1.if_data = kmem_alloc(real_size, KM_SLEEP);
} else if (ifp->if_u1.if_data != ifp->if_u2.if_inline_data) {
/*
* Only do the realloc if the underlying size
* is really changing.
*/
if (ifp->if_real_bytes != real_size) {
ifp->if_u1.if_data =
kmem_realloc(ifp->if_u1.if_data,
real_size,
ifp->if_real_bytes,
KM_SLEEP);
}
} else {
ASSERT(ifp->if_real_bytes == 0);
ifp->if_u1.if_data = kmem_alloc(real_size, KM_SLEEP);
memcpy(ifp->if_u1.if_data, ifp->if_u2.if_inline_data,
ifp->if_bytes);
}
}
ifp->if_real_bytes = real_size;
ifp->if_bytes = new_size;
ASSERT(ifp->if_bytes <= XFS_IFORK_SIZE(ip, whichfork));
}
void
xfs_idestroy_fork(
xfs_inode_t *ip,
int whichfork)
{
xfs_ifork_t *ifp;
ifp = XFS_IFORK_PTR(ip, whichfork);
if (ifp->if_broot != NULL) {
kmem_free(ifp->if_broot);
ifp->if_broot = NULL;
}
/*
* If the format is local, then we can't have an extents
* array so just look for an inline data array. If we're
* not local then we may or may not have an extents list,
* so check and free it up if we do.
*/
if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL) {
if ((ifp->if_u1.if_data != ifp->if_u2.if_inline_data) &&
(ifp->if_u1.if_data != NULL)) {
ASSERT(ifp->if_real_bytes != 0);
kmem_free(ifp->if_u1.if_data);
ifp->if_u1.if_data = NULL;
ifp->if_real_bytes = 0;
}
} else if ((ifp->if_flags & XFS_IFEXTENTS) &&
((ifp->if_flags & XFS_IFEXTIREC) ||
((ifp->if_u1.if_extents != NULL) &&
(ifp->if_u1.if_extents != ifp->if_u2.if_inline_ext)))) {
ASSERT(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);
ASSERT(ifp->if_real_bytes == 0);
if (whichfork == XFS_ATTR_FORK) {
kmem_zone_free(xfs_ifork_zone, ip->i_afp);
ip->i_afp = NULL;
}
}
/*
* Increment the pin count of the given buffer.
* This value is protected by ipinlock spinlock in the mount structure.
*/
void
xfs_ipin(
xfs_inode_t *ip)
{
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
atomic_inc(&ip->i_pincount);
}
/*
* Decrement the pin count of the given inode, and wake up
* anyone in xfs_iwait_unpin() if the count goes to 0. The
* inode must have been previously pinned with a call to xfs_ipin().
*/
void
xfs_iunpin(
xfs_inode_t *ip)
{
ASSERT(atomic_read(&ip->i_pincount) > 0);
if (atomic_dec_and_test(&ip->i_pincount))
wake_up(&ip->i_ipin_wait);
}
/*
* This is called to unpin an inode. It can be directed to wait or to return
* immediately without waiting for the inode to be unpinned. The caller must
* have the inode locked in at least shared mode so that the buffer cannot be
* subsequently pinned once someone is waiting for it to be unpinned.
*/
STATIC void
__xfs_iunpin_wait(
xfs_inode_t *ip,
int wait)
{
xfs_inode_log_item_t *iip = ip->i_itemp;
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_ILOCK_SHARED));
if (atomic_read(&ip->i_pincount) == 0)
return;
/* Give the log a push to start the unpinning I/O */
if (iip && iip->ili_last_lsn)
xfs_log_force_lsn(ip->i_mount, iip->ili_last_lsn, 0);
else
xfs_log_force(ip->i_mount, 0);
if (wait)
wait_event(ip->i_ipin_wait, (atomic_read(&ip->i_pincount) == 0));
}
void
xfs_iunpin_wait(
xfs_inode_t *ip)
{
__xfs_iunpin_wait(ip, 1);
}
static inline void
xfs_iunpin_nowait(
xfs_inode_t *ip)
{
__xfs_iunpin_wait(ip, 0);
}
/*
* xfs_iextents_copy()
*
* This is called to copy the REAL extents (as opposed to the delayed
* allocation extents) from the inode into the given buffer. It
* returns the number of bytes copied into the buffer.
*
* If there are no delayed allocation extents, then we can just
* memcpy() the extents into the buffer. Otherwise, we need to
* examine each extent in turn and skip those which are delayed.
*/
int
xfs_iextents_copy(
xfs_inode_t *ip,
xfs_bmbt_rec_t *dp,
int whichfork)
{
int copied;
int i;
xfs_ifork_t *ifp;
int nrecs;
xfs_fsblock_t start_block;
ifp = XFS_IFORK_PTR(ip, whichfork);
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_ILOCK_SHARED));
ASSERT(ifp->if_bytes > 0);
nrecs = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
XFS_BMAP_TRACE_EXLIST(ip, nrecs, whichfork);
ASSERT(nrecs > 0);
/*
* There are some delayed allocation extents in the
* inode, so copy the extents one at a time and skip
* the delayed ones. There must be at least one
* non-delayed extent.
*/
copied = 0;
for (i = 0; i < nrecs; i++) {
xfs_bmbt_rec_host_t *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.
*/
continue;
}
/* Translate to on disk format */
put_unaligned(cpu_to_be64(ep->l0), &dp->l0);
put_unaligned(cpu_to_be64(ep->l1), &dp->l1);
dp++;
copied++;
}
ASSERT(copied != 0);
xfs_validate_extents(ifp, copied, XFS_EXTFMT_INODE(ip));
return (copied * (uint)sizeof(xfs_bmbt_rec_t));
}
/*
* Each of the following cases stores data into the same region
* of the on-disk inode, so only one of them can be valid at
* any given time. While it is possible to have conflicting formats
* and log flags, e.g. having XFS_ILOG_?DATA set when the fork is
* in EXTENTS format, this can only happen when the fork has
* changed formats after being modified but before being flushed.
* In these cases, the format always takes precedence, because the
* format indicates the current state of the fork.
*/
/*ARGSUSED*/
STATIC void
xfs_iflush_fork(
xfs_inode_t *ip,
xfs_dinode_t *dip,
xfs_inode_log_item_t *iip,
int whichfork,
xfs_buf_t *bp)
{
char *cp;
xfs_ifork_t *ifp;
xfs_mount_t *mp;
#ifdef XFS_TRANS_DEBUG
int first;
#endif
static const short brootflag[2] =
{ XFS_ILOG_DBROOT, XFS_ILOG_ABROOT };
static const short dataflag[2] =
{ XFS_ILOG_DDATA, XFS_ILOG_ADATA };
static const short extflag[2] =
{ XFS_ILOG_DEXT, XFS_ILOG_AEXT };
if (!iip)
return;
ifp = XFS_IFORK_PTR(ip, whichfork);
/*
* This can happen if we gave up in iformat in an error path,
* for the attribute fork.
*/
if (!ifp) {
ASSERT(whichfork == XFS_ATTR_FORK);
return;
}
cp = XFS_DFORK_PTR(dip, whichfork);
mp = ip->i_mount;
switch (XFS_IFORK_FORMAT(ip, whichfork)) {
case XFS_DINODE_FMT_LOCAL:
if ((iip->ili_format.ilf_fields & dataflag[whichfork]) &&
(ifp->if_bytes > 0)) {
ASSERT(ifp->if_u1.if_data != NULL);
ASSERT(ifp->if_bytes <= XFS_IFORK_SIZE(ip, whichfork));
memcpy(cp, ifp->if_u1.if_data, ifp->if_bytes);
}
break;
case XFS_DINODE_FMT_EXTENTS:
ASSERT((ifp->if_flags & XFS_IFEXTENTS) ||
!(iip->ili_format.ilf_fields & extflag[whichfork]));
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);
(void)xfs_iextents_copy(ip, (xfs_bmbt_rec_t *)cp,
whichfork);
}
break;
case XFS_DINODE_FMT_BTREE:
if ((iip->ili_format.ilf_fields & brootflag[whichfork]) &&
(ifp->if_broot_bytes > 0)) {
ASSERT(ifp->if_broot != NULL);
ASSERT(ifp->if_broot_bytes <=
(XFS_IFORK_SIZE(ip, whichfork) +
XFS_BROOT_SIZE_ADJ));
xfs_bmbt_to_bmdr(mp, ifp->if_broot, ifp->if_broot_bytes,
(xfs_bmdr_block_t *)cp,
XFS_DFORK_SIZE(dip, mp, whichfork));
}
break;
case XFS_DINODE_FMT_DEV:
if (iip->ili_format.ilf_fields & XFS_ILOG_DEV) {
ASSERT(whichfork == XFS_DATA_FORK);
xfs_dinode_put_rdev(dip, ip->i_df.if_u2.if_rdev);
}
break;
case XFS_DINODE_FMT_UUID:
if (iip->ili_format.ilf_fields & XFS_ILOG_UUID) {
ASSERT(whichfork == XFS_DATA_FORK);
memcpy(XFS_DFORK_DPTR(dip),
&ip->i_df.if_u2.if_uuid,
sizeof(uuid_t));
}
break;
default:
ASSERT(0);
break;
}
}
STATIC int
xfs_iflush_cluster(
xfs_inode_t *ip,
xfs_buf_t *bp)
{
xfs_mount_t *mp = ip->i_mount;
struct xfs_perag *pag;
unsigned long first_index, mask;
unsigned long inodes_per_cluster;
int ilist_size;
xfs_inode_t **ilist;
xfs_inode_t *iq;
int nr_found;
int clcount = 0;
int bufwasdelwri;
int i;
pag = xfs_perag_get(mp, XFS_INO_TO_AGNO(mp, ip->i_ino));
ASSERT(pag->pagi_inodeok);
ASSERT(pag->pag_ici_init);
inodes_per_cluster = XFS_INODE_CLUSTER_SIZE(mp) >> mp->m_sb.sb_inodelog;
ilist_size = inodes_per_cluster * sizeof(xfs_inode_t *);
ilist = kmem_alloc(ilist_size, KM_MAYFAIL|KM_NOFS);
if (!ilist)
goto out_put;
mask = ~(((XFS_INODE_CLUSTER_SIZE(mp) >> mp->m_sb.sb_inodelog)) - 1);
first_index = XFS_INO_TO_AGINO(mp, ip->i_ino) & mask;
read_lock(&pag->pag_ici_lock);
/* really need a gang lookup range call here */
nr_found = radix_tree_gang_lookup(&pag->pag_ici_root, (void**)ilist,
first_index, inodes_per_cluster);
if (nr_found == 0)
goto out_free;
for (i = 0; i < nr_found; i++) {
iq = ilist[i];
if (iq == ip)
continue;
/* if the inode lies outside this cluster, we're done. */
if ((XFS_INO_TO_AGINO(mp, iq->i_ino) & mask) != first_index)
break;
/*
* Do an un-protected check to see if the inode is dirty and
* is a candidate for flushing. These checks will be repeated
* later after the appropriate locks are acquired.
*/
if (xfs_inode_clean(iq) && xfs_ipincount(iq) == 0)
continue;
/*
* Try to get locks. If any are unavailable or it is pinned,
* then this inode cannot be flushed and is skipped.
*/
if (!xfs_ilock_nowait(iq, XFS_ILOCK_SHARED))
continue;
if (!xfs_iflock_nowait(iq)) {
xfs_iunlock(iq, XFS_ILOCK_SHARED);
continue;
}
if (xfs_ipincount(iq)) {
xfs_ifunlock(iq);
xfs_iunlock(iq, XFS_ILOCK_SHARED);
continue;
}
/*
* arriving here means that this inode can be flushed. First
* re-check that it's dirty before flushing.
*/
if (!xfs_inode_clean(iq)) {
int error;
error = xfs_iflush_int(iq, bp);
if (error) {
xfs_iunlock(iq, XFS_ILOCK_SHARED);
goto cluster_corrupt_out;
}
clcount++;
} else {
xfs_ifunlock(iq);
}
xfs_iunlock(iq, XFS_ILOCK_SHARED);
}
if (clcount) {
XFS_STATS_INC(xs_icluster_flushcnt);
XFS_STATS_ADD(xs_icluster_flushinode, clcount);
}
out_free:
read_unlock(&pag->pag_ici_lock);
kmem_free(ilist);
out_put:
xfs_perag_put(pag);
return 0;
cluster_corrupt_out:
/*
* Corruption detected in the clustering loop. Invalidate the
* inode buffer and shut down the filesystem.
*/
read_unlock(&pag->pag_ici_lock);
/*
* Clean up the buffer. If it was B_DELWRI, just release it --
* brelse can handle it with no problems. If not, shut down the
* filesystem before releasing the buffer.
*/
bufwasdelwri = XFS_BUF_ISDELAYWRITE(bp);
if (bufwasdelwri)
xfs_buf_relse(bp);
xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
if (!bufwasdelwri) {
/*
* Just like incore_relse: if we have b_iodone functions,
* mark the buffer as an error and call them. Otherwise
* mark it as stale and brelse.
*/
if (XFS_BUF_IODONE_FUNC(bp)) {
XFS_BUF_CLR_BDSTRAT_FUNC(bp);
XFS_BUF_UNDONE(bp);
XFS_BUF_STALE(bp);
XFS_BUF_ERROR(bp,EIO);
xfs_biodone(bp);
} else {
XFS_BUF_STALE(bp);
xfs_buf_relse(bp);
}
}
/*
* Unlocks the flush lock
*/
xfs_iflush_abort(iq);
kmem_free(ilist);
xfs_perag_put(pag);
return XFS_ERROR(EFSCORRUPTED);
}
/*
* xfs_iflush() will write a modified inode's changes out to the
* inode's on disk home. The caller must have the inode lock held
* in at least shared mode and the inode flush completion must be
* active as well. The inode lock will still be held upon return from
* the call and the caller is free to unlock it.
* The inode flush will be completed when the inode reaches the disk.
* The flags indicate how the inode's buffer should be written out.
*/
int
xfs_iflush(
xfs_inode_t *ip,
uint flags)
{
xfs_inode_log_item_t *iip;
xfs_buf_t *bp;
xfs_dinode_t *dip;
xfs_mount_t *mp;
int error;
XFS_STATS_INC(xs_iflush_count);
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_ILOCK_SHARED));
ASSERT(!completion_done(&ip->i_flush));
ASSERT(ip->i_d.di_format != XFS_DINODE_FMT_BTREE ||
ip->i_d.di_nextents > ip->i_df.if_ext_max);
iip = ip->i_itemp;
mp = ip->i_mount;
/*
* We can't flush the inode until it is unpinned, so wait for it if we
* are allowed to block. We know noone new can pin it, because we are
* holding the inode lock shared and you need to hold it exclusively to
* pin the inode.
*
* If we are not allowed to block, force the log out asynchronously so
* that when we come back the inode will be unpinned. If other inodes
* in the same cluster are dirty, they will probably write the inode
* out for us if they occur after the log force completes.
*/
if (!(flags & SYNC_WAIT) && xfs_ipincount(ip)) {
xfs_iunpin_nowait(ip);
xfs_ifunlock(ip);
return EAGAIN;
}
xfs_iunpin_wait(ip);
/*
* For stale inodes we cannot rely on the backing buffer remaining
* stale in cache for the remaining life of the stale inode and so
* xfs_itobp() below may give us a buffer that no longer contains
* inodes below. We have to check this after ensuring the inode is
* unpinned so that it is safe to reclaim the stale inode after the
* flush call.
*/
if (xfs_iflags_test(ip, XFS_ISTALE)) {
xfs_ifunlock(ip);
return 0;
}
/*
* This may have been unpinned because the filesystem is shutting
* down forcibly. If that's the case we must not write this inode
* to disk, because the log record didn't make it to disk!
*/
if (XFS_FORCED_SHUTDOWN(mp)) {
ip->i_update_core = 0;
if (iip)
iip->ili_format.ilf_fields = 0;
xfs_ifunlock(ip);
return XFS_ERROR(EIO);
}
/*
* Get the buffer containing the on-disk inode.
*/
error = xfs_itobp(mp, NULL, ip, &dip, &bp,
(flags & SYNC_WAIT) ? XBF_LOCK : XBF_TRYLOCK);
if (error || !bp) {
xfs_ifunlock(ip);
return error;
}
/*
* First flush out the inode that xfs_iflush was called with.
*/
error = xfs_iflush_int(ip, bp);
if (error)
goto corrupt_out;
/*
* If the buffer is pinned then push on the log now so we won't
* get stuck waiting in the write for too long.
*/
if (XFS_BUF_ISPINNED(bp))
xfs_log_force(mp, 0);
/*
* inode clustering:
* see if other inodes can be gathered into this write
*/
error = xfs_iflush_cluster(ip, bp);
if (error)
goto cluster_corrupt_out;
if (flags & SYNC_WAIT)
error = xfs_bwrite(mp, bp);
else
xfs_bdwrite(mp, bp);
return error;
corrupt_out:
xfs_buf_relse(bp);
xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
cluster_corrupt_out:
/*
* Unlocks the flush lock
*/
xfs_iflush_abort(ip);
return XFS_ERROR(EFSCORRUPTED);
}
STATIC int
xfs_iflush_int(
xfs_inode_t *ip,
xfs_buf_t *bp)
{
xfs_inode_log_item_t *iip;
xfs_dinode_t *dip;
xfs_mount_t *mp;
#ifdef XFS_TRANS_DEBUG
int first;
#endif
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_ILOCK_SHARED));
ASSERT(!completion_done(&ip->i_flush));
ASSERT(ip->i_d.di_format != XFS_DINODE_FMT_BTREE ||
ip->i_d.di_nextents > ip->i_df.if_ext_max);
iip = ip->i_itemp;
mp = ip->i_mount;
/* set *dip = inode's place in the buffer */
dip = (xfs_dinode_t *)xfs_buf_offset(bp, ip->i_imap.im_boffset);
/*
* Clear i_update_core before copying out the data.
* This is for coordination with our timestamp updates
* that don't hold the inode lock. They will always
* update the timestamps BEFORE setting i_update_core,
* so if we clear i_update_core after they set it we
* are guaranteed to see their updates to the timestamps.
* I believe that this depends on strongly ordered memory
* semantics, but we have that. We use the SYNCHRONIZE
* macro to make sure that the compiler does not reorder
* the i_update_core access below the data copy below.
*/
ip->i_update_core = 0;
SYNCHRONIZE();
/*
* Make sure to get the latest timestamps from the Linux inode.
*/
xfs_synchronize_times(ip);
if (XFS_TEST_ERROR(be16_to_cpu(dip->di_magic) != XFS_DINODE_MAGIC,
mp, XFS_ERRTAG_IFLUSH_1, XFS_RANDOM_IFLUSH_1)) {
xfs_cmn_err(XFS_PTAG_IFLUSH, CE_ALERT, mp,
"xfs_iflush: Bad inode %Lu magic number 0x%x, ptr 0x%p",
ip->i_ino, be16_to_cpu(dip->di_magic), dip);
goto corrupt_out;
}
if (XFS_TEST_ERROR(ip->i_d.di_magic != XFS_DINODE_MAGIC,
mp, XFS_ERRTAG_IFLUSH_2, XFS_RANDOM_IFLUSH_2)) {
xfs_cmn_err(XFS_PTAG_IFLUSH, CE_ALERT, mp,
"xfs_iflush: Bad inode %Lu, ptr 0x%p, magic number 0x%x",
ip->i_ino, ip, ip->i_d.di_magic);
goto corrupt_out;
}
if ((ip->i_d.di_mode & S_IFMT) == S_IFREG) {
if (XFS_TEST_ERROR(
(ip->i_d.di_format != XFS_DINODE_FMT_EXTENTS) &&
(ip->i_d.di_format != XFS_DINODE_FMT_BTREE),
mp, XFS_ERRTAG_IFLUSH_3, XFS_RANDOM_IFLUSH_3)) {
xfs_cmn_err(XFS_PTAG_IFLUSH, CE_ALERT, mp,
"xfs_iflush: Bad regular inode %Lu, ptr 0x%p",
ip->i_ino, ip);
goto corrupt_out;
}
} else if ((ip->i_d.di_mode & S_IFMT) == S_IFDIR) {
if (XFS_TEST_ERROR(
(ip->i_d.di_format != XFS_DINODE_FMT_EXTENTS) &&
(ip->i_d.di_format != XFS_DINODE_FMT_BTREE) &&
(ip->i_d.di_format != XFS_DINODE_FMT_LOCAL),
mp, XFS_ERRTAG_IFLUSH_4, XFS_RANDOM_IFLUSH_4)) {
xfs_cmn_err(XFS_PTAG_IFLUSH, CE_ALERT, mp,
"xfs_iflush: Bad directory inode %Lu, ptr 0x%p",
ip->i_ino, ip);
goto corrupt_out;
}
}
if (XFS_TEST_ERROR(ip->i_d.di_nextents + ip->i_d.di_anextents >
ip->i_d.di_nblocks, mp, XFS_ERRTAG_IFLUSH_5,
XFS_RANDOM_IFLUSH_5)) {
xfs_cmn_err(XFS_PTAG_IFLUSH, CE_ALERT, mp,
"xfs_iflush: detected corrupt incore inode %Lu, total extents = %d, nblocks = %Ld, ptr 0x%p",
ip->i_ino,
ip->i_d.di_nextents + ip->i_d.di_anextents,
ip->i_d.di_nblocks,
ip);
goto corrupt_out;
}
if (XFS_TEST_ERROR(ip->i_d.di_forkoff > mp->m_sb.sb_inodesize,
mp, XFS_ERRTAG_IFLUSH_6, XFS_RANDOM_IFLUSH_6)) {
xfs_cmn_err(XFS_PTAG_IFLUSH, CE_ALERT, mp,
"xfs_iflush: bad inode %Lu, forkoff 0x%x, ptr 0x%p",
ip->i_ino, ip->i_d.di_forkoff, ip);
goto corrupt_out;
}
/*
* bump the flush iteration count, used to detect flushes which
* postdate a log record during recovery.
*/
ip->i_d.di_flushiter++;
/*
* Copy the dirty parts of the inode into the on-disk
* inode. We always copy out the core of the inode,
* because if the inode is dirty at all the core must
* be.
*/
xfs_dinode_to_disk(dip, &ip->i_d);
/* Wrap, we never let the log put out DI_MAX_FLUSH */
if (ip->i_d.di_flushiter == DI_MAX_FLUSH)
ip->i_d.di_flushiter = 0;
/*
* If this is really an old format inode and the superblock version
* has not been updated to support only new format inodes, then
* convert back to the old inode format. If the superblock version
* has been updated, then make the conversion permanent.
*/
ASSERT(ip->i_d.di_version == 1 || xfs_sb_version_hasnlink(&mp->m_sb));
if (ip->i_d.di_version == 1) {
if (!xfs_sb_version_hasnlink(&mp->m_sb)) {
/*
* Convert it back.
*/
ASSERT(ip->i_d.di_nlink <= XFS_MAXLINK_1);
dip->di_onlink = cpu_to_be16(ip->i_d.di_nlink);
} else {
/*
* The superblock version has already been bumped,
* so just make the conversion to the new inode
* format permanent.
*/
ip->i_d.di_version = 2;
dip->di_version = 2;
ip->i_d.di_onlink = 0;
dip->di_onlink = 0;
memset(&(ip->i_d.di_pad[0]), 0, sizeof(ip->i_d.di_pad));
memset(&(dip->di_pad[0]), 0,
sizeof(dip->di_pad));
ASSERT(ip->i_d.di_projid == 0);
}
}
xfs_iflush_fork(ip, dip, iip, XFS_DATA_FORK, bp);
if (XFS_IFORK_Q(ip))
xfs_iflush_fork(ip, dip, iip, XFS_ATTR_FORK, bp);
xfs_inobp_check(mp, bp);
/*
* We've recorded everything logged in the inode, so we'd
* like to clear the ilf_fields bits so we don't log and
* flush things unnecessarily. However, we can't stop
* logging all this information until the data we've copied
* into the disk buffer is written to disk. If we did we might
* overwrite the copy of the inode in the log with all the
* data after re-logging only part of it, and in the face of
* a crash we wouldn't have all the data we need to recover.
*
* What we do is move the bits to the ili_last_fields field.
* When logging the inode, these bits are moved back to the
* ilf_fields field. In the xfs_iflush_done() routine we
* clear ili_last_fields, since we know that the information
* those bits represent is permanently on disk. As long as
* the flush completes before the inode is logged again, then
* both ilf_fields and ili_last_fields will be cleared.
*
* We can play with the ilf_fields bits here, because the inode
* lock must be held exclusively in order to set bits there
* and the flush lock protects the ili_last_fields bits.
* Set ili_logged so the flush done
* routine can tell whether or not to look in the AIL.
* Also, store the current LSN of the inode so that we can tell
* whether the item has moved in the AIL from xfs_iflush_done().
* In order to read the lsn we need the AIL lock, because
* it is a 64 bit value that cannot be read atomically.
*/
if (iip != NULL && iip->ili_format.ilf_fields != 0) {
iip->ili_last_fields = iip->ili_format.ilf_fields;
iip->ili_format.ilf_fields = 0;
iip->ili_logged = 1;
xfs_trans_ail_copy_lsn(mp->m_ail, &iip->ili_flush_lsn,
&iip->ili_item.li_lsn);
/*
* Attach the function xfs_iflush_done to the inode's
* buffer. This will remove the inode from the AIL
* and unlock the inode's flush lock when the inode is
* completely written to disk.
*/
xfs_buf_attach_iodone(bp, (void(*)(xfs_buf_t*,xfs_log_item_t*))
xfs_iflush_done, (xfs_log_item_t *)iip);
ASSERT(XFS_BUF_FSPRIVATE(bp, void *) != NULL);
ASSERT(XFS_BUF_IODONE_FUNC(bp) != NULL);
} else {
/*
* We're flushing an inode which is not in the AIL and has
* not been logged but has i_update_core set. For this
* case we can use a B_DELWRI flush and immediately drop
* the inode flush lock because we can avoid the whole
* AIL state thing. It's OK to drop the flush lock now,
* because we've already locked the buffer and to do anything
* you really need both.
*/
if (iip != NULL) {
ASSERT(iip->ili_logged == 0);
ASSERT(iip->ili_last_fields == 0);
ASSERT((iip->ili_item.li_flags & XFS_LI_IN_AIL) == 0);
}
xfs_ifunlock(ip);
}
return 0;
corrupt_out:
return XFS_ERROR(EFSCORRUPTED);
}
/*
* Return a pointer to the extent record at file index idx.
*/
xfs_bmbt_rec_host_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_flags & XFS_IFEXTIREC) && (idx == 0)) {
return ifp->if_u1.if_ext_irec->er_extbuf;
} else if (ifp->if_flags & XFS_IFEXTIREC) {
xfs_ext_irec_t *erp; /* irec pointer */
int erp_idx = 0; /* irec index */
xfs_extnum_t page_idx = idx; /* ext index in target list */
erp = xfs_iext_idx_to_irec(ifp, &page_idx, &erp_idx, 0);
return &erp->er_extbuf[page_idx];
} else 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_inode_t *ip, /* incore inode 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 */
int state) /* type of extent conversion */
{
xfs_ifork_t *ifp = (state & BMAP_ATTRFORK) ? ip->i_afp : &ip->i_df;
xfs_extnum_t i; /* extent record index */
trace_xfs_iext_insert(ip, idx, new, state, _RET_IP_);
ASSERT(ifp->if_flags & XFS_IFEXTENTS);
xfs_iext_add(ifp, idx, count);
for (i = idx; i < idx + count; i++, new++)
xfs_bmbt_set_all(xfs_iext_get_ext(ifp, i), 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) /* number 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;
ifp->if_lastex = nextents + ext_diff;
}
/*
* 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 if (nextents + ext_diff <= XFS_LINEAR_EXTS) {
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);
}
}
/* Indirection array */
else {
xfs_ext_irec_t *erp;
int erp_idx = 0;
int page_idx = idx;
ASSERT(nextents + ext_diff > XFS_LINEAR_EXTS);
if (ifp->if_flags & XFS_IFEXTIREC) {
erp = xfs_iext_idx_to_irec(ifp, &page_idx, &erp_idx, 1);
} else {
xfs_iext_irec_init(ifp);
ASSERT(ifp->if_flags & XFS_IFEXTIREC);
erp = ifp->if_u1.if_ext_irec;
}
/* Extents fit in target extent page */
if (erp && erp->er_extcount + ext_diff <= XFS_LINEAR_EXTS) {
if (page_idx < erp->er_extcount) {
memmove(&erp->er_extbuf[page_idx + ext_diff],
&erp->er_extbuf[page_idx],
(erp->er_extcount - page_idx) *
sizeof(xfs_bmbt_rec_t));
memset(&erp->er_extbuf[page_idx], 0, byte_diff);
}
erp->er_extcount += ext_diff;
xfs_iext_irec_update_extoffs(ifp, erp_idx + 1, ext_diff);
}
/* Insert a new extent page */
else if (erp) {
xfs_iext_add_indirect_multi(ifp,
erp_idx, page_idx, ext_diff);
}
/*
* If extent(s) are being appended to the last page in
* the indirection array and the new extent(s) don't fit
* in the page, then erp is NULL and erp_idx is set to
* the next index needed in the indirection array.
*/
else {
int count = ext_diff;
while (count) {
erp = xfs_iext_irec_new(ifp, erp_idx);
erp->er_extcount = count;
count -= MIN(count, (int)XFS_LINEAR_EXTS);
if (count) {
erp_idx++;
}
}
}
}
ifp->if_bytes = new_size;
}
/*
* This is called when incore extents are being added to the indirection
* array and the new extents do not fit in the target extent list. The
* erp_idx parameter contains the irec index for the target extent list
* in the indirection array, and the idx parameter contains the extent
* index within the list. The number of extents being added is stored
* in the count parameter.
*
* |-------| |-------|
* | | | | idx - number of extents before idx
* | idx | | count |
* | | | | count - number of extents being inserted at idx
* |-------| |-------|
* | count | | nex2 | nex2 - number of extents after idx + count
* |-------| |-------|
*/
void
xfs_iext_add_indirect_multi(
xfs_ifork_t *ifp, /* inode fork pointer */
int erp_idx, /* target extent irec index */
xfs_extnum_t idx, /* index within target list */
int count) /* new extents being added */
{
int byte_diff; /* new bytes being added */
xfs_ext_irec_t *erp; /* pointer to irec entry */
xfs_extnum_t ext_diff; /* number of extents to add */
xfs_extnum_t ext_cnt; /* new extents still needed */
xfs_extnum_t nex2; /* extents after idx + count */
xfs_bmbt_rec_t *nex2_ep = NULL; /* temp list for nex2 extents */
int nlists; /* number of irec's (lists) */
ASSERT(ifp->if_flags & XFS_IFEXTIREC);
erp = &ifp->if_u1.if_ext_irec[erp_idx];
nex2 = erp->er_extcount - idx;
nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ;
/*
* Save second part of target extent list
* (all extents past */
if (nex2) {
byte_diff = nex2 * sizeof(xfs_bmbt_rec_t);
nex2_ep = (xfs_bmbt_rec_t *) kmem_alloc(byte_diff, KM_NOFS);
memmove(nex2_ep, &erp->er_extbuf[idx], byte_diff);
erp->er_extcount -= nex2;
xfs_iext_irec_update_extoffs(ifp, erp_idx + 1, -nex2);
memset(&erp->er_extbuf[idx], 0, byte_diff);
}
/*
* Add the new extents to the end of the target
* list, then allocate new irec record(s) and
* extent buffer(s) as needed to store the rest
* of the new extents.
*/
ext_cnt = count;
ext_diff = MIN(ext_cnt, (int)XFS_LINEAR_EXTS - erp->er_extcount);
if (ext_diff) {
erp->er_extcount += ext_diff;
xfs_iext_irec_update_extoffs(ifp, erp_idx + 1, ext_diff);
ext_cnt -= ext_diff;
}
while (ext_cnt) {
erp_idx++;
erp = xfs_iext_irec_new(ifp, erp_idx);
ext_diff = MIN(ext_cnt, (int)XFS_LINEAR_EXTS);
erp->er_extcount = ext_diff;
xfs_iext_irec_update_extoffs(ifp, erp_idx + 1, ext_diff);
ext_cnt -= ext_diff;
}
/* Add nex2 extents back to indirection array */
if (nex2) {
xfs_extnum_t ext_avail;
int i;
byte_diff = nex2 * sizeof(xfs_bmbt_rec_t);
ext_avail = XFS_LINEAR_EXTS - erp->er_extcount;
i = 0;
/*
* If nex2 extents fit in the current page, append
* nex2_ep after the new extents.
*/
if (nex2 <= ext_avail) {
i = erp->er_extcount;
}
/*
* Otherwise, check if space is available in the
* next page.
*/
else if ((erp_idx < nlists - 1) &&
(nex2 <= (ext_avail = XFS_LINEAR_EXTS -
ifp->if_u1.if_ext_irec[erp_idx+1].er_extcount))) {
erp_idx++;
erp++;
/* Create a hole for nex2 extents */
memmove(&erp->er_extbuf[nex2], erp->er_extbuf,
erp->er_extcount * sizeof(xfs_bmbt_rec_t));
}
/*
* Final choice, create a new extent page for
* nex2 extents.
*/
else {
erp_idx++;
erp = xfs_iext_irec_new(ifp, erp_idx);
}
memmove(&erp->er_extbuf[i], nex2_ep, byte_diff);
kmem_free(nex2_ep);
erp->er_extcount += nex2;
xfs_iext_irec_update_extoffs(ifp, erp_idx + 1, nex2);
}
}
/*
* 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.
*
* If the amount of space needed has decreased below the linear
* limit, XFS_IEXT_BUFSZ, then switch to using the contiguous
* extent array. Otherwise, use kmem_realloc() to adjust the
* size to what is needed.
*/
void
xfs_iext_remove(
xfs_inode_t *ip, /* incore inode pointer */
xfs_extnum_t idx, /* index to begin removing exts */
int ext_diff, /* number of extents to remove */
int state) /* type of extent conversion */
{
xfs_ifork_t *ifp = (state & BMAP_ATTRFORK) ? ip->i_afp : &ip->i_df;
xfs_extnum_t nextents; /* number of extents in file */
int new_size; /* size of extents after removal */
trace_xfs_iext_remove(ip, idx, state, _RET_IP_);
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_flags & XFS_IFEXTIREC) {
xfs_iext_remove_indirect(ifp, idx, ext_diff);
} 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(!(ifp->if_flags & XFS_IFEXTIREC));
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 */
ASSERT(!(ifp->if_flags & XFS_IFEXTIREC));
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;
}
/*
* This is called when incore extents are being removed from the
* indirection array and the extents being removed span multiple extent
* buffers. The idx parameter contains the file extent index where we
* want to begin removing extents, and the count parameter contains
* how many extents need to be removed.
*
* |-------| |-------|
* | nex1 | | | nex1 - number of extents before idx
* |-------| | count |
* | | | | count - number of extents being removed at idx
* | count | |-------|
* | | | nex2 | nex2 - number of extents after idx + count
* |-------| |-------|
*/
void
xfs_iext_remove_indirect(
xfs_ifork_t *ifp, /* inode fork pointer */
xfs_extnum_t idx, /* index to begin removing extents */
int count) /* number of extents to remove */
{
xfs_ext_irec_t *erp; /* indirection array pointer */
int erp_idx = 0; /* indirection array index */
xfs_extnum_t ext_cnt; /* extents left to remove */
xfs_extnum_t ext_diff; /* extents to remove in current list */
xfs_extnum_t nex1; /* number of extents before idx */
xfs_extnum_t nex2; /* extents after idx + count */
int nlists; /* entries in indirection array */
int page_idx = idx; /* index in target extent list */
ASSERT(ifp->if_flags & XFS_IFEXTIREC);
erp = xfs_iext_idx_to_irec(ifp, &page_idx, &erp_idx, 0);
ASSERT(erp != NULL);
nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ;
nex1 = page_idx;
ext_cnt = count;
while (ext_cnt) {
nex2 = MAX((erp->er_extcount - (nex1 + ext_cnt)), 0);
ext_diff = MIN(ext_cnt, (erp->er_extcount - nex1));
/*
* Check for deletion of entire list;
* xfs_iext_irec_remove() updates extent offsets.
*/
if (ext_diff == erp->er_extcount) {
xfs_iext_irec_remove(ifp, erp_idx);
ext_cnt -= ext_diff;
nex1 = 0;
if (ext_cnt) {
ASSERT(erp_idx < ifp->if_real_bytes /
XFS_IEXT_BUFSZ);
erp = &ifp->if_u1.if_ext_irec[erp_idx];
nex1 = 0;
continue;
} else {
break;
}
}
/* Move extents up (if needed) */
if (nex2) {
memmove(&erp->er_extbuf[nex1],
&erp->er_extbuf[nex1 + ext_diff],
nex2 * sizeof(xfs_bmbt_rec_t));
}
/* Zero out rest of page */
memset(&erp->er_extbuf[nex1 + nex2], 0, (XFS_IEXT_BUFSZ -
((nex1 + nex2) * sizeof(xfs_bmbt_rec_t))));
/* Update remaining counters */
erp->er_extcount -= ext_diff;
xfs_iext_irec_update_extoffs(ifp, erp_idx + 1, -ext_diff);
ext_cnt -= ext_diff;
nex1 = 0;
erp_idx++;
erp++;
}
ifp->if_bytes -= count * sizeof(xfs_bmbt_rec_t);
xfs_iext_irec_compact(ifp);
}
/*
* 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;
ASSERT(!(ifp->if_flags & XFS_IFEXTIREC) ||
((new_size >= 0) && (new_size <= XFS_IEXT_BUFSZ) &&
(new_size != ifp->if_real_bytes)));
/* 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 (!is_power_of_2(new_size)){
rnew_size = roundup_pow_of_two(new_size);
}
if (rnew_size != ifp->if_real_bytes) {
ifp->if_u1.if_extents =
kmem_realloc(ifp->if_u1.if_extents,
rnew_size,
ifp->if_real_bytes, KM_NOFS);
}
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 (!is_power_of_2(new_size)) {
rnew_size = roundup_pow_of_two(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);
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 = kmem_alloc(new_size, KM_NOFS);
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;
}
/*
* Resize an extent indirection array to new_size bytes.
*/
STATIC void
xfs_iext_realloc_indirect(
xfs_ifork_t *ifp, /* inode fork pointer */
int new_size) /* new indirection array size */
{
int nlists; /* number of irec's (ex lists) */
int size; /* current indirection array size */
ASSERT(ifp->if_flags & XFS_IFEXTIREC);
nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ;
size = nlists * sizeof(xfs_ext_irec_t);
ASSERT(ifp->if_real_bytes);
ASSERT((new_size >= 0) && (new_size != size));
if (new_size == 0) {
xfs_iext_destroy(ifp);
} else {
ifp->if_u1.if_ext_irec = (xfs_ext_irec_t *)
kmem_realloc(ifp->if_u1.if_ext_irec,
new_size, size, KM_NOFS);
}
}
/*
* Switch from indirection array to linear (direct) extent allocations.
*/
STATIC void
xfs_iext_indirect_to_direct(
xfs_ifork_t *ifp) /* inode fork pointer */
{
xfs_bmbt_rec_host_t *ep; /* extent record pointer */
xfs_extnum_t nextents; /* number of extents in file */
int size; /* size of file extents */
ASSERT(ifp->if_flags & XFS_IFEXTIREC);
nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
ASSERT(nextents <= XFS_LINEAR_EXTS);
size = nextents * sizeof(xfs_bmbt_rec_t);
xfs_iext_irec_compact_pages(ifp);
ASSERT(ifp->if_real_bytes == XFS_IEXT_BUFSZ);
ep = ifp->if_u1.if_ext_irec->er_extbuf;
kmem_free(ifp->if_u1.if_ext_irec);
ifp->if_flags &= ~XFS_IFEXTIREC;
ifp->if_u1.if_extents = ep;
ifp->if_bytes = size;
if (nextents < XFS_LINEAR_EXTS) {
xfs_iext_realloc_direct(ifp, size);
}
}
/*
* Free incore file extents.
*/
void
xfs_iext_destroy(
xfs_ifork_t *ifp) /* inode fork pointer */
{
if (ifp->if_flags & XFS_IFEXTIREC) {
int erp_idx;
int nlists;
nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ;
for (erp_idx = nlists - 1; erp_idx >= 0 ; erp_idx--) {
xfs_iext_irec_remove(ifp, erp_idx);
}
ifp->if_flags &= ~XFS_IFEXTIREC;
} else if (ifp->if_real_bytes) {
kmem_free(ifp->if_u1.if_extents);
} 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;
}
/*
* Return a pointer to the extent record for file system block bno.
*/
xfs_bmbt_rec_host_t * /* pointer to found extent record */
xfs_iext_bno_to_ext(
xfs_ifork_t *ifp, /* inode fork pointer */
xfs_fileoff_t bno, /* block number to search for */
xfs_extnum_t *idxp) /* index of target extent */
{
xfs_bmbt_rec_host_t *base; /* pointer to first extent */
xfs_filblks_t blockcount = 0; /* number of blocks in extent */
xfs_bmbt_rec_host_t *ep = NULL; /* pointer to target extent */
xfs_ext_irec_t *erp = NULL; /* indirection array pointer */
int high; /* upper boundary in search */
xfs_extnum_t idx = 0; /* index of target extent */
int low; /* lower boundary in search */
xfs_extnum_t nextents; /* number of file extents */
xfs_fileoff_t startoff = 0; /* start offset of extent */
nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
if (nextents == 0) {
*idxp = 0;
return NULL;
}
low = 0;
if (ifp->if_flags & XFS_IFEXTIREC) {
/* Find target extent list */
int erp_idx = 0;
erp = xfs_iext_bno_to_irec(ifp, bno, &erp_idx);
base = erp->er_extbuf;
high = erp->er_extcount - 1;
} else {
base = ifp->if_u1.if_extents;
high = nextents - 1;
}
/* Binary search extent records */
while (low <= high) {
idx = (low + high) >> 1;
ep = base + idx;
startoff = xfs_bmbt_get_startoff(ep);
blockcount = xfs_bmbt_get_blockcount(ep);
if (bno < startoff) {
high = idx - 1;
} else if (bno >= startoff + blockcount) {
low = idx + 1;
} else {
/* Convert back to file-based extent index */
if (ifp->if_flags & XFS_IFEXTIREC) {
idx += erp->er_extoff;
}
*idxp = idx;
return ep;
}
}
/* Convert back to file-based extent index */
if (ifp->if_flags & XFS_IFEXTIREC) {
idx += erp->er_extoff;
}
if (bno >= startoff + blockcount) {
if (++idx == nextents) {
ep = NULL;
} else {
ep = xfs_iext_get_ext(ifp, idx);
}
}
*idxp = idx;
return ep;
}
/*
* Return a pointer to the indirection array entry containing the
* extent record for filesystem block bno. Store the index of the
* target irec in *erp_idxp.
*/
xfs_ext_irec_t * /* pointer to found extent record */
xfs_iext_bno_to_irec(
xfs_ifork_t *ifp, /* inode fork pointer */
xfs_fileoff_t bno, /* block number to search for */
int *erp_idxp) /* irec index of target ext list */
{
xfs_ext_irec_t *erp = NULL; /* indirection array pointer */
xfs_ext_irec_t *erp_next; /* next indirection array entry */
int erp_idx; /* indirection array index */
int nlists; /* number of extent irec's (lists) */
int high; /* binary search upper limit */
int low; /* binary search lower limit */
ASSERT(ifp->if_flags & XFS_IFEXTIREC);
nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ;
erp_idx = 0;
low = 0;
high = nlists - 1;
while (low <= high) {
erp_idx = (low + high) >> 1;
erp = &ifp->if_u1.if_ext_irec[erp_idx];
erp_next = erp_idx < nlists - 1 ? erp + 1 : NULL;
if (bno < xfs_bmbt_get_startoff(erp->er_extbuf)) {
high = erp_idx - 1;
} else if (erp_next && bno >=
xfs_bmbt_get_startoff(erp_next->er_extbuf)) {
low = erp_idx + 1;
} else {
break;
}
}
*erp_idxp = erp_idx;
return erp;
}
/*
* Return a pointer to the indirection array entry containing the
* extent record at file extent index *idxp. Store the index of the
* target irec in *erp_idxp and store the page index of the target
* extent record in *idxp.
*/
xfs_ext_irec_t *
xfs_iext_idx_to_irec(
xfs_ifork_t *ifp, /* inode fork pointer */
xfs_extnum_t *idxp, /* extent index (file -> page) */
int *erp_idxp, /* pointer to target irec */
int realloc) /* new bytes were just added */
{
xfs_ext_irec_t *prev; /* pointer to previous irec */
xfs_ext_irec_t *erp = NULL; /* pointer to current irec */
int erp_idx; /* indirection array index */
int nlists; /* number of irec's (ex lists) */
int high; /* binary search upper limit */
int low; /* binary search lower limit */
xfs_extnum_t page_idx = *idxp; /* extent index in target list */
ASSERT(ifp->if_flags & XFS_IFEXTIREC);
ASSERT(page_idx >= 0 && page_idx <=
ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t));
nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ;
erp_idx = 0;
low = 0;
high = nlists - 1;
/* Binary search extent irec's */
while (low <= high) {
erp_idx = (low + high) >> 1;
erp = &ifp->if_u1.if_ext_irec[erp_idx];
prev = erp_idx > 0 ? erp - 1 : NULL;
if (page_idx < erp->er_extoff || (page_idx == erp->er_extoff &&
realloc && prev && prev->er_extcount < XFS_LINEAR_EXTS)) {
high = erp_idx - 1;
} else if (page_idx > erp->er_extoff + erp->er_extcount ||
(page_idx == erp->er_extoff + erp->er_extcount &&
!realloc)) {
low = erp_idx + 1;
} else if (page_idx == erp->er_extoff + erp->er_extcount &&
erp->er_extcount == XFS_LINEAR_EXTS) {
ASSERT(realloc);
page_idx = 0;
erp_idx++;
erp = erp_idx < nlists ? erp + 1 : NULL;
break;
} else {
page_idx -= erp->er_extoff;
break;
}
}
*idxp = page_idx;
*erp_idxp = erp_idx;
return(erp);
}
/*
* Allocate and initialize an indirection array once the space needed
* for incore extents increases above XFS_IEXT_BUFSZ.
*/
void
xfs_iext_irec_init(
xfs_ifork_t *ifp) /* inode fork pointer */
{
xfs_ext_irec_t *erp; /* indirection array pointer */
xfs_extnum_t nextents; /* number of extents in file */
ASSERT(!(ifp->if_flags & XFS_IFEXTIREC));
nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
ASSERT(nextents <= XFS_LINEAR_EXTS);
erp = kmem_alloc(sizeof(xfs_ext_irec_t), KM_NOFS);
if (nextents == 0) {
ifp->if_u1.if_extents = kmem_alloc(XFS_IEXT_BUFSZ, KM_NOFS);
} else if (!ifp->if_real_bytes) {
xfs_iext_inline_to_direct(ifp, XFS_IEXT_BUFSZ);
} else if (ifp->if_real_bytes < XFS_IEXT_BUFSZ) {
xfs_iext_realloc_direct(ifp, XFS_IEXT_BUFSZ);
}
erp->er_extbuf = ifp->if_u1.if_extents;
erp->er_extcount = nextents;
erp->er_extoff = 0;
ifp->if_flags |= XFS_IFEXTIREC;
ifp->if_real_bytes = XFS_IEXT_BUFSZ;
ifp->if_bytes = nextents * sizeof(xfs_bmbt_rec_t);
ifp->if_u1.if_ext_irec = erp;
return;
}
/*
* Allocate and initialize a new entry in the indirection array.
*/
xfs_ext_irec_t *
xfs_iext_irec_new(
xfs_ifork_t *ifp, /* inode fork pointer */
int erp_idx) /* index for new irec */
{
xfs_ext_irec_t *erp; /* indirection array pointer */
int i; /* loop counter */
int nlists; /* number of irec's (ex lists) */
ASSERT(ifp->if_flags & XFS_IFEXTIREC);
nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ;
/* Resize indirection array */
xfs_iext_realloc_indirect(ifp, ++nlists *
sizeof(xfs_ext_irec_t));
/*
* Move records down in the array so the
* new page can use erp_idx.
*/
erp = ifp->if_u1.if_ext_irec;
for (i = nlists - 1; i > erp_idx; i--) {
memmove(&erp[i], &erp[i-1], sizeof(xfs_ext_irec_t));
}
ASSERT(i == erp_idx);
/* Initialize new extent record */
erp = ifp->if_u1.if_ext_irec;
erp[erp_idx].er_extbuf = kmem_alloc(XFS_IEXT_BUFSZ, KM_NOFS);
ifp->if_real_bytes = nlists * XFS_IEXT_BUFSZ;
memset(erp[erp_idx].er_extbuf, 0, XFS_IEXT_BUFSZ);
erp[erp_idx].er_extcount = 0;
erp[erp_idx].er_extoff = erp_idx > 0 ?
erp[erp_idx-1].er_extoff + erp[erp_idx-1].er_extcount : 0;
return (&erp[erp_idx]);
}
/*
* Remove a record from the indirection array.
*/
void
xfs_iext_irec_remove(
xfs_ifork_t *ifp, /* inode fork pointer */
int erp_idx) /* irec index to remove */
{
xfs_ext_irec_t *erp; /* indirection array pointer */
int i; /* loop counter */
int nlists; /* number of irec's (ex lists) */
ASSERT(ifp->if_flags & XFS_IFEXTIREC);
nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ;
erp = &ifp->if_u1.if_ext_irec[erp_idx];
if (erp->er_extbuf) {
xfs_iext_irec_update_extoffs(ifp, erp_idx + 1,
-erp->er_extcount);
kmem_free(erp->er_extbuf);
}
/* Compact extent records */
erp = ifp->if_u1.if_ext_irec;
for (i = erp_idx; i < nlists - 1; i++) {
memmove(&erp[i], &erp[i+1], sizeof(xfs_ext_irec_t));
}
/*
* Manually free the last extent record from the indirection
* array. A call to xfs_iext_realloc_indirect() with a size
* of zero would result in a call to xfs_iext_destroy() which
* would in turn call this function again, creating a nasty
* infinite loop.
*/
if (--nlists) {
xfs_iext_realloc_indirect(ifp,
nlists * sizeof(xfs_ext_irec_t));
} else {
kmem_free(ifp->if_u1.if_ext_irec);
}
ifp->if_real_bytes = nlists * XFS_IEXT_BUFSZ;
}
/*
* This is called to clean up large amounts of unused memory allocated
* by the indirection array. Before compacting anything though, verify
* that the indirection array is still needed and switch back to the
* linear extent list (or even the inline buffer) if possible. The
* compaction policy is as follows:
*
* Full Compaction: Extents fit into a single page (or inline buffer)
* Partial Compaction: Extents occupy less than 50% of allocated space
* No Compaction: Extents occupy at least 50% of allocated space
*/
void
xfs_iext_irec_compact(
xfs_ifork_t *ifp) /* inode fork pointer */
{
xfs_extnum_t nextents; /* number of extents in file */
int nlists; /* number of irec's (ex lists) */
ASSERT(ifp->if_flags & XFS_IFEXTIREC);
nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ;
nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
if (nextents == 0) {
xfs_iext_destroy(ifp);
} else if (nextents <= XFS_INLINE_EXTS) {
xfs_iext_indirect_to_direct(ifp);
xfs_iext_direct_to_inline(ifp, nextents);
} else if (nextents <= XFS_LINEAR_EXTS) {
xfs_iext_indirect_to_direct(ifp);
} else if (nextents < (nlists * XFS_LINEAR_EXTS) >> 1) {
xfs_iext_irec_compact_pages(ifp);
}
}
/*
* Combine extents from neighboring extent pages.
*/
void
xfs_iext_irec_compact_pages(
xfs_ifork_t *ifp) /* inode fork pointer */
{
xfs_ext_irec_t *erp, *erp_next;/* pointers to irec entries */
int erp_idx = 0; /* indirection array index */
int nlists; /* number of irec's (ex lists) */
ASSERT(ifp->if_flags & XFS_IFEXTIREC);
nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ;
while (erp_idx < nlists - 1) {
erp = &ifp->if_u1.if_ext_irec[erp_idx];
erp_next = erp + 1;
if (erp_next->er_extcount <=
(XFS_LINEAR_EXTS - erp->er_extcount)) {
memcpy(&erp->er_extbuf[erp->er_extcount],
erp_next->er_extbuf, erp_next->er_extcount *
sizeof(xfs_bmbt_rec_t));
erp->er_extcount += erp_next->er_extcount;
/*
* Free page before removing extent record
* so er_extoffs don't get modified in
* xfs_iext_irec_remove.
*/
kmem_free(erp_next->er_extbuf);
erp_next->er_extbuf = NULL;
xfs_iext_irec_remove(ifp, erp_idx + 1);
nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ;
} else {
erp_idx++;
}
}
}
/*
* This is called to update the er_extoff field in the indirection
* array when extents have been added or removed from one of the
* extent lists. erp_idx contains the irec index to begin updating
* at and ext_diff contains the number of extents that were added
* or removed.
*/
void
xfs_iext_irec_update_extoffs(
xfs_ifork_t *ifp, /* inode fork pointer */
int erp_idx, /* irec index to update */
int ext_diff) /* number of new extents */
{
int i; /* loop counter */
int nlists; /* number of irec's (ex lists */
ASSERT(ifp->if_flags & XFS_IFEXTIREC);
nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ;
for (i = erp_idx; i < nlists; i++) {
ifp->if_u1.if_ext_irec[i].er_extoff += ext_diff;
}
}
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