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xfs_inode.c
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/*
* Copyright (c) 2000-2006 Silicon Graphics, Inc.
* All Rights Reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it would be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <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_mount.h"
#include "xfs_bmap_btree.h"
#include "xfs_alloc_btree.h"
#include "xfs_ialloc_btree.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_alloc.h"
#include "xfs_ialloc.h"
#include "xfs_bmap.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_extents(). 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_alert(mp,
"Detected bogus zero next_unlinked field in incore inode buffer 0x%p.",
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) {
xfs_warn(mp,
"%s: xfs_trans_read_buf() returned error %d.",
__func__, error);
} 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 = dip->di_magic == cpu_to_be16(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_UNTRUSTED) {
xfs_trans_brelse(tp, bp);
return XFS_ERROR(EINVAL);
}
XFS_CORRUPTION_ERROR("xfs_imap_to_bp",
XFS_ERRLEVEL_HIGH, mp, dip);
#ifdef DEBUG
xfs_emerg(mp,
"bad inode magic/vsn daddr %lld #%d (magic=%x)",
(unsigned long long)imap->im_blkno, i,
be16_to_cpu(dip->di_magic));
ASSERT(0);
#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_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_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_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(S_ISREG(be16_to_cpu(dip->di_mode)))) {
xfs_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_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 | KM_NOFS);
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_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_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 | KM_NOFS);
}
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_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_warn(ip->i_mount, "corrupt inode %Lu (btree).",
(unsigned long long) ip->i_ino);
XFS_CORRUPTION_ERROR("xfs_iformat_btree", XFS_ERRLEVEL_LOW,
ip->i_mount, dip);
return XFS_ERROR(EFSCORRUPTED);
}
ifp->if_broot_bytes = size;
ifp->if_broot = kmem_alloc(size, KM_SLEEP | KM_NOFS);
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_lo = be16_to_cpu(from->di_projid_lo);
to->di_projid_hi = be16_to_cpu(from->di_projid_hi);
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_lo = cpu_to_be16(from->di_projid_lo);
to->di_projid_hi = cpu_to_be16(from->di_projid_hi);
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,
uint iget_flags)
{
xfs_buf_t *bp;
xfs_dinode_t *dip;
int error;
/*
* Fill in the location information in the in-core inode.
*/
error = xfs_imap(mp, tp, ip->i_ino, &ip->i_imap, iget_flags);
if (error)
return error;
/*
* 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 (dip->di_magic != cpu_to_be16(XFS_DINODE_MAGIC)) {
#ifdef DEBUG
xfs_alert(mp,
"%s: dip->di_magic (0x%x) != XFS_DINODE_MAGIC (0x%x)",
__func__, 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_alert(mp, "%s: xfs_iformat() returned error %d",
__func__, 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;
xfs_set_projid(ip, 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;
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);
ifp = XFS_IFORK_PTR(ip, whichfork);
/*
* We know that the size is valid (it's checked in iformat_btree)
*/
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,
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);
/*