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xfs_attr_leaf.c
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/*
* Copyright (c) 2000-2005 Silicon Graphics, Inc.
* Copyright (c) 2013 Red Hat, Inc.
* All Rights Reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it would be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "xfs.h"
#include "xfs_fs.h"
#include "xfs_shared.h"
#include "xfs_format.h"
#include "xfs_log_format.h"
#include "xfs_trans_resv.h"
#include "xfs_bit.h"
#include "xfs_sb.h"
#include "xfs_mount.h"
#include "xfs_da_format.h"
#include "xfs_da_btree.h"
#include "xfs_inode.h"
#include "xfs_trans.h"
#include "xfs_inode_item.h"
#include "xfs_bmap_btree.h"
#include "xfs_bmap.h"
#include "xfs_attr_sf.h"
#include "xfs_attr_remote.h"
#include "xfs_attr.h"
#include "xfs_attr_leaf.h"
#include "xfs_error.h"
#include "xfs_trace.h"
#include "xfs_buf_item.h"
#include "xfs_cksum.h"
#include "xfs_dir2.h"
#include "xfs_log.h"
/*
* xfs_attr_leaf.c
*
* Routines to implement leaf blocks of attributes as Btrees of hashed names.
*/
/*========================================================================
* Function prototypes for the kernel.
*========================================================================*/
/*
* Routines used for growing the Btree.
*/
STATIC int xfs_attr3_leaf_create(struct xfs_da_args *args,
xfs_dablk_t which_block, struct xfs_buf **bpp);
STATIC int xfs_attr3_leaf_add_work(struct xfs_buf *leaf_buffer,
struct xfs_attr3_icleaf_hdr *ichdr,
struct xfs_da_args *args, int freemap_index);
STATIC void xfs_attr3_leaf_compact(struct xfs_da_args *args,
struct xfs_attr3_icleaf_hdr *ichdr,
struct xfs_buf *leaf_buffer);
STATIC void xfs_attr3_leaf_rebalance(xfs_da_state_t *state,
xfs_da_state_blk_t *blk1,
xfs_da_state_blk_t *blk2);
STATIC int xfs_attr3_leaf_figure_balance(xfs_da_state_t *state,
xfs_da_state_blk_t *leaf_blk_1,
struct xfs_attr3_icleaf_hdr *ichdr1,
xfs_da_state_blk_t *leaf_blk_2,
struct xfs_attr3_icleaf_hdr *ichdr2,
int *number_entries_in_blk1,
int *number_usedbytes_in_blk1);
/*
* Utility routines.
*/
STATIC void xfs_attr3_leaf_moveents(struct xfs_da_args *args,
struct xfs_attr_leafblock *src_leaf,
struct xfs_attr3_icleaf_hdr *src_ichdr, int src_start,
struct xfs_attr_leafblock *dst_leaf,
struct xfs_attr3_icleaf_hdr *dst_ichdr, int dst_start,
int move_count);
STATIC int xfs_attr_leaf_entsize(xfs_attr_leafblock_t *leaf, int index);
/*
* attr3 block 'firstused' conversion helpers.
*
* firstused refers to the offset of the first used byte of the nameval region
* of an attr leaf block. The region starts at the tail of the block and expands
* backwards towards the middle. As such, firstused is initialized to the block
* size for an empty leaf block and is reduced from there.
*
* The attr3 block size is pegged to the fsb size and the maximum fsb is 64k.
* The in-core firstused field is 32-bit and thus supports the maximum fsb size.
* The on-disk field is only 16-bit, however, and overflows at 64k. Since this
* only occurs at exactly 64k, we use zero as a magic on-disk value to represent
* the attr block size. The following helpers manage the conversion between the
* in-core and on-disk formats.
*/
static void
xfs_attr3_leaf_firstused_from_disk(
struct xfs_da_geometry *geo,
struct xfs_attr3_icleaf_hdr *to,
struct xfs_attr_leafblock *from)
{
struct xfs_attr3_leaf_hdr *hdr3;
if (from->hdr.info.magic == cpu_to_be16(XFS_ATTR3_LEAF_MAGIC)) {
hdr3 = (struct xfs_attr3_leaf_hdr *) from;
to->firstused = be16_to_cpu(hdr3->firstused);
} else {
to->firstused = be16_to_cpu(from->hdr.firstused);
}
/*
* Convert from the magic fsb size value to actual blocksize. This
* should only occur for empty blocks when the block size overflows
* 16-bits.
*/
if (to->firstused == XFS_ATTR3_LEAF_NULLOFF) {
ASSERT(!to->count && !to->usedbytes);
ASSERT(geo->blksize > USHRT_MAX);
to->firstused = geo->blksize;
}
}
static void
xfs_attr3_leaf_firstused_to_disk(
struct xfs_da_geometry *geo,
struct xfs_attr_leafblock *to,
struct xfs_attr3_icleaf_hdr *from)
{
struct xfs_attr3_leaf_hdr *hdr3;
uint32_t firstused;
/* magic value should only be seen on disk */
ASSERT(from->firstused != XFS_ATTR3_LEAF_NULLOFF);
/*
* Scale down the 32-bit in-core firstused value to the 16-bit on-disk
* value. This only overflows at the max supported value of 64k. Use the
* magic on-disk value to represent block size in this case.
*/
firstused = from->firstused;
if (firstused > USHRT_MAX) {
ASSERT(from->firstused == geo->blksize);
firstused = XFS_ATTR3_LEAF_NULLOFF;
}
if (from->magic == XFS_ATTR3_LEAF_MAGIC) {
hdr3 = (struct xfs_attr3_leaf_hdr *) to;
hdr3->firstused = cpu_to_be16(firstused);
} else {
to->hdr.firstused = cpu_to_be16(firstused);
}
}
void
xfs_attr3_leaf_hdr_from_disk(
struct xfs_da_geometry *geo,
struct xfs_attr3_icleaf_hdr *to,
struct xfs_attr_leafblock *from)
{
int i;
ASSERT(from->hdr.info.magic == cpu_to_be16(XFS_ATTR_LEAF_MAGIC) ||
from->hdr.info.magic == cpu_to_be16(XFS_ATTR3_LEAF_MAGIC));
if (from->hdr.info.magic == cpu_to_be16(XFS_ATTR3_LEAF_MAGIC)) {
struct xfs_attr3_leaf_hdr *hdr3 = (struct xfs_attr3_leaf_hdr *)from;
to->forw = be32_to_cpu(hdr3->info.hdr.forw);
to->back = be32_to_cpu(hdr3->info.hdr.back);
to->magic = be16_to_cpu(hdr3->info.hdr.magic);
to->count = be16_to_cpu(hdr3->count);
to->usedbytes = be16_to_cpu(hdr3->usedbytes);
xfs_attr3_leaf_firstused_from_disk(geo, to, from);
to->holes = hdr3->holes;
for (i = 0; i < XFS_ATTR_LEAF_MAPSIZE; i++) {
to->freemap[i].base = be16_to_cpu(hdr3->freemap[i].base);
to->freemap[i].size = be16_to_cpu(hdr3->freemap[i].size);
}
return;
}
to->forw = be32_to_cpu(from->hdr.info.forw);
to->back = be32_to_cpu(from->hdr.info.back);
to->magic = be16_to_cpu(from->hdr.info.magic);
to->count = be16_to_cpu(from->hdr.count);
to->usedbytes = be16_to_cpu(from->hdr.usedbytes);
xfs_attr3_leaf_firstused_from_disk(geo, to, from);
to->holes = from->hdr.holes;
for (i = 0; i < XFS_ATTR_LEAF_MAPSIZE; i++) {
to->freemap[i].base = be16_to_cpu(from->hdr.freemap[i].base);
to->freemap[i].size = be16_to_cpu(from->hdr.freemap[i].size);
}
}
void
xfs_attr3_leaf_hdr_to_disk(
struct xfs_da_geometry *geo,
struct xfs_attr_leafblock *to,
struct xfs_attr3_icleaf_hdr *from)
{
int i;
ASSERT(from->magic == XFS_ATTR_LEAF_MAGIC ||
from->magic == XFS_ATTR3_LEAF_MAGIC);
if (from->magic == XFS_ATTR3_LEAF_MAGIC) {
struct xfs_attr3_leaf_hdr *hdr3 = (struct xfs_attr3_leaf_hdr *)to;
hdr3->info.hdr.forw = cpu_to_be32(from->forw);
hdr3->info.hdr.back = cpu_to_be32(from->back);
hdr3->info.hdr.magic = cpu_to_be16(from->magic);
hdr3->count = cpu_to_be16(from->count);
hdr3->usedbytes = cpu_to_be16(from->usedbytes);
xfs_attr3_leaf_firstused_to_disk(geo, to, from);
hdr3->holes = from->holes;
hdr3->pad1 = 0;
for (i = 0; i < XFS_ATTR_LEAF_MAPSIZE; i++) {
hdr3->freemap[i].base = cpu_to_be16(from->freemap[i].base);
hdr3->freemap[i].size = cpu_to_be16(from->freemap[i].size);
}
return;
}
to->hdr.info.forw = cpu_to_be32(from->forw);
to->hdr.info.back = cpu_to_be32(from->back);
to->hdr.info.magic = cpu_to_be16(from->magic);
to->hdr.count = cpu_to_be16(from->count);
to->hdr.usedbytes = cpu_to_be16(from->usedbytes);
xfs_attr3_leaf_firstused_to_disk(geo, to, from);
to->hdr.holes = from->holes;
to->hdr.pad1 = 0;
for (i = 0; i < XFS_ATTR_LEAF_MAPSIZE; i++) {
to->hdr.freemap[i].base = cpu_to_be16(from->freemap[i].base);
to->hdr.freemap[i].size = cpu_to_be16(from->freemap[i].size);
}
}
static bool
xfs_attr3_leaf_verify(
struct xfs_buf *bp)
{
struct xfs_mount *mp = bp->b_target->bt_mount;
struct xfs_attr_leafblock *leaf = bp->b_addr;
struct xfs_attr3_icleaf_hdr ichdr;
xfs_attr3_leaf_hdr_from_disk(mp->m_attr_geo, &ichdr, leaf);
if (xfs_sb_version_hascrc(&mp->m_sb)) {
struct xfs_da3_node_hdr *hdr3 = bp->b_addr;
if (ichdr.magic != XFS_ATTR3_LEAF_MAGIC)
return false;
if (!uuid_equal(&hdr3->info.uuid, &mp->m_sb.sb_meta_uuid))
return false;
if (be64_to_cpu(hdr3->info.blkno) != bp->b_bn)
return false;
if (!xfs_log_check_lsn(mp, be64_to_cpu(hdr3->info.lsn)))
return false;
} else {
if (ichdr.magic != XFS_ATTR_LEAF_MAGIC)
return false;
}
if (ichdr.count == 0)
return false;
/* XXX: need to range check rest of attr header values */
/* XXX: hash order check? */
return true;
}
static void
xfs_attr3_leaf_write_verify(
struct xfs_buf *bp)
{
struct xfs_mount *mp = bp->b_target->bt_mount;
struct xfs_buf_log_item *bip = bp->b_fspriv;
struct xfs_attr3_leaf_hdr *hdr3 = bp->b_addr;
if (!xfs_attr3_leaf_verify(bp)) {
xfs_buf_ioerror(bp, -EFSCORRUPTED);
xfs_verifier_error(bp);
return;
}
if (!xfs_sb_version_hascrc(&mp->m_sb))
return;
if (bip)
hdr3->info.lsn = cpu_to_be64(bip->bli_item.li_lsn);
xfs_buf_update_cksum(bp, XFS_ATTR3_LEAF_CRC_OFF);
}
/*
* leaf/node format detection on trees is sketchy, so a node read can be done on
* leaf level blocks when detection identifies the tree as a node format tree
* incorrectly. In this case, we need to swap the verifier to match the correct
* format of the block being read.
*/
static void
xfs_attr3_leaf_read_verify(
struct xfs_buf *bp)
{
struct xfs_mount *mp = bp->b_target->bt_mount;
if (xfs_sb_version_hascrc(&mp->m_sb) &&
!xfs_buf_verify_cksum(bp, XFS_ATTR3_LEAF_CRC_OFF))
xfs_buf_ioerror(bp, -EFSBADCRC);
else if (!xfs_attr3_leaf_verify(bp))
xfs_buf_ioerror(bp, -EFSCORRUPTED);
if (bp->b_error)
xfs_verifier_error(bp);
}
const struct xfs_buf_ops xfs_attr3_leaf_buf_ops = {
.name = "xfs_attr3_leaf",
.verify_read = xfs_attr3_leaf_read_verify,
.verify_write = xfs_attr3_leaf_write_verify,
};
int
xfs_attr3_leaf_read(
struct xfs_trans *tp,
struct xfs_inode *dp,
xfs_dablk_t bno,
xfs_daddr_t mappedbno,
struct xfs_buf **bpp)
{
int err;
err = xfs_da_read_buf(tp, dp, bno, mappedbno, bpp,
XFS_ATTR_FORK, &xfs_attr3_leaf_buf_ops);
if (!err && tp)
xfs_trans_buf_set_type(tp, *bpp, XFS_BLFT_ATTR_LEAF_BUF);
return err;
}
/*========================================================================
* Namespace helper routines
*========================================================================*/
/*
* If namespace bits don't match return 0.
* If all match then return 1.
*/
STATIC int
xfs_attr_namesp_match(int arg_flags, int ondisk_flags)
{
return XFS_ATTR_NSP_ONDISK(ondisk_flags) == XFS_ATTR_NSP_ARGS_TO_ONDISK(arg_flags);
}
/*========================================================================
* External routines when attribute fork size < XFS_LITINO(mp).
*========================================================================*/
/*
* Query whether the requested number of additional bytes of extended
* attribute space will be able to fit inline.
*
* Returns zero if not, else the di_forkoff fork offset to be used in the
* literal area for attribute data once the new bytes have been added.
*
* di_forkoff must be 8 byte aligned, hence is stored as a >>3 value;
* special case for dev/uuid inodes, they have fixed size data forks.
*/
int
xfs_attr_shortform_bytesfit(xfs_inode_t *dp, int bytes)
{
int offset;
int minforkoff; /* lower limit on valid forkoff locations */
int maxforkoff; /* upper limit on valid forkoff locations */
int dsize;
xfs_mount_t *mp = dp->i_mount;
/* rounded down */
offset = (XFS_LITINO(mp, dp->i_d.di_version) - bytes) >> 3;
switch (dp->i_d.di_format) {
case XFS_DINODE_FMT_DEV:
minforkoff = roundup(sizeof(xfs_dev_t), 8) >> 3;
return (offset >= minforkoff) ? minforkoff : 0;
case XFS_DINODE_FMT_UUID:
minforkoff = roundup(sizeof(uuid_t), 8) >> 3;
return (offset >= minforkoff) ? minforkoff : 0;
}
/*
* If the requested numbers of bytes is smaller or equal to the
* current attribute fork size we can always proceed.
*
* Note that if_bytes in the data fork might actually be larger than
* the current data fork size is due to delalloc extents. In that
* case either the extent count will go down when they are converted
* to real extents, or the delalloc conversion will take care of the
* literal area rebalancing.
*/
if (bytes <= XFS_IFORK_ASIZE(dp))
return dp->i_d.di_forkoff;
/*
* For attr2 we can try to move the forkoff if there is space in the
* literal area, but for the old format we are done if there is no
* space in the fixed attribute fork.
*/
if (!(mp->m_flags & XFS_MOUNT_ATTR2))
return 0;
dsize = dp->i_df.if_bytes;
switch (dp->i_d.di_format) {
case XFS_DINODE_FMT_EXTENTS:
/*
* If there is no attr fork and the data fork is extents,
* determine if creating the default attr fork will result
* in the extents form migrating to btree. If so, the
* minimum offset only needs to be the space required for
* the btree root.
*/
if (!dp->i_d.di_forkoff && dp->i_df.if_bytes >
xfs_default_attroffset(dp))
dsize = XFS_BMDR_SPACE_CALC(MINDBTPTRS);
break;
case XFS_DINODE_FMT_BTREE:
/*
* If we have a data btree then keep forkoff if we have one,
* otherwise we are adding a new attr, so then we set
* minforkoff to where the btree root can finish so we have
* plenty of room for attrs
*/
if (dp->i_d.di_forkoff) {
if (offset < dp->i_d.di_forkoff)
return 0;
return dp->i_d.di_forkoff;
}
dsize = XFS_BMAP_BROOT_SPACE(mp, dp->i_df.if_broot);
break;
}
/*
* A data fork btree root must have space for at least
* MINDBTPTRS key/ptr pairs if the data fork is small or empty.
*/
minforkoff = MAX(dsize, XFS_BMDR_SPACE_CALC(MINDBTPTRS));
minforkoff = roundup(minforkoff, 8) >> 3;
/* attr fork btree root can have at least this many key/ptr pairs */
maxforkoff = XFS_LITINO(mp, dp->i_d.di_version) -
XFS_BMDR_SPACE_CALC(MINABTPTRS);
maxforkoff = maxforkoff >> 3; /* rounded down */
if (offset >= maxforkoff)
return maxforkoff;
if (offset >= minforkoff)
return offset;
return 0;
}
/*
* Switch on the ATTR2 superblock bit (implies also FEATURES2)
*/
STATIC void
xfs_sbversion_add_attr2(xfs_mount_t *mp, xfs_trans_t *tp)
{
if ((mp->m_flags & XFS_MOUNT_ATTR2) &&
!(xfs_sb_version_hasattr2(&mp->m_sb))) {
spin_lock(&mp->m_sb_lock);
if (!xfs_sb_version_hasattr2(&mp->m_sb)) {
xfs_sb_version_addattr2(&mp->m_sb);
spin_unlock(&mp->m_sb_lock);
xfs_log_sb(tp);
} else
spin_unlock(&mp->m_sb_lock);
}
}
/*
* Create the initial contents of a shortform attribute list.
*/
void
xfs_attr_shortform_create(xfs_da_args_t *args)
{
xfs_attr_sf_hdr_t *hdr;
xfs_inode_t *dp;
xfs_ifork_t *ifp;
trace_xfs_attr_sf_create(args);
dp = args->dp;
ASSERT(dp != NULL);
ifp = dp->i_afp;
ASSERT(ifp != NULL);
ASSERT(ifp->if_bytes == 0);
if (dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS) {
ifp->if_flags &= ~XFS_IFEXTENTS; /* just in case */
dp->i_d.di_aformat = XFS_DINODE_FMT_LOCAL;
ifp->if_flags |= XFS_IFINLINE;
} else {
ASSERT(ifp->if_flags & XFS_IFINLINE);
}
xfs_idata_realloc(dp, sizeof(*hdr), XFS_ATTR_FORK);
hdr = (xfs_attr_sf_hdr_t *)ifp->if_u1.if_data;
hdr->count = 0;
hdr->totsize = cpu_to_be16(sizeof(*hdr));
xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_ADATA);
}
/*
* Add a name/value pair to the shortform attribute list.
* Overflow from the inode has already been checked for.
*/
void
xfs_attr_shortform_add(xfs_da_args_t *args, int forkoff)
{
xfs_attr_shortform_t *sf;
xfs_attr_sf_entry_t *sfe;
int i, offset, size;
xfs_mount_t *mp;
xfs_inode_t *dp;
xfs_ifork_t *ifp;
trace_xfs_attr_sf_add(args);
dp = args->dp;
mp = dp->i_mount;
dp->i_d.di_forkoff = forkoff;
ifp = dp->i_afp;
ASSERT(ifp->if_flags & XFS_IFINLINE);
sf = (xfs_attr_shortform_t *)ifp->if_u1.if_data;
sfe = &sf->list[0];
for (i = 0; i < sf->hdr.count; sfe = XFS_ATTR_SF_NEXTENTRY(sfe), i++) {
#ifdef DEBUG
if (sfe->namelen != args->namelen)
continue;
if (memcmp(args->name, sfe->nameval, args->namelen) != 0)
continue;
if (!xfs_attr_namesp_match(args->flags, sfe->flags))
continue;
ASSERT(0);
#endif
}
offset = (char *)sfe - (char *)sf;
size = XFS_ATTR_SF_ENTSIZE_BYNAME(args->namelen, args->valuelen);
xfs_idata_realloc(dp, size, XFS_ATTR_FORK);
sf = (xfs_attr_shortform_t *)ifp->if_u1.if_data;
sfe = (xfs_attr_sf_entry_t *)((char *)sf + offset);
sfe->namelen = args->namelen;
sfe->valuelen = args->valuelen;
sfe->flags = XFS_ATTR_NSP_ARGS_TO_ONDISK(args->flags);
memcpy(sfe->nameval, args->name, args->namelen);
memcpy(&sfe->nameval[args->namelen], args->value, args->valuelen);
sf->hdr.count++;
be16_add_cpu(&sf->hdr.totsize, size);
xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_ADATA);
xfs_sbversion_add_attr2(mp, args->trans);
}
/*
* After the last attribute is removed revert to original inode format,
* making all literal area available to the data fork once more.
*/
void
xfs_attr_fork_remove(
struct xfs_inode *ip,
struct xfs_trans *tp)
{
xfs_idestroy_fork(ip, XFS_ATTR_FORK);
ip->i_d.di_forkoff = 0;
ip->i_d.di_aformat = XFS_DINODE_FMT_EXTENTS;
ASSERT(ip->i_d.di_anextents == 0);
ASSERT(ip->i_afp == NULL);
xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
}
/*
* Remove an attribute from the shortform attribute list structure.
*/
int
xfs_attr_shortform_remove(xfs_da_args_t *args)
{
xfs_attr_shortform_t *sf;
xfs_attr_sf_entry_t *sfe;
int base, size=0, end, totsize, i;
xfs_mount_t *mp;
xfs_inode_t *dp;
trace_xfs_attr_sf_remove(args);
dp = args->dp;
mp = dp->i_mount;
base = sizeof(xfs_attr_sf_hdr_t);
sf = (xfs_attr_shortform_t *)dp->i_afp->if_u1.if_data;
sfe = &sf->list[0];
end = sf->hdr.count;
for (i = 0; i < end; sfe = XFS_ATTR_SF_NEXTENTRY(sfe),
base += size, i++) {
size = XFS_ATTR_SF_ENTSIZE(sfe);
if (sfe->namelen != args->namelen)
continue;
if (memcmp(sfe->nameval, args->name, args->namelen) != 0)
continue;
if (!xfs_attr_namesp_match(args->flags, sfe->flags))
continue;
break;
}
if (i == end)
return -ENOATTR;
/*
* Fix up the attribute fork data, covering the hole
*/
end = base + size;
totsize = be16_to_cpu(sf->hdr.totsize);
if (end != totsize)
memmove(&((char *)sf)[base], &((char *)sf)[end], totsize - end);
sf->hdr.count--;
be16_add_cpu(&sf->hdr.totsize, -size);
/*
* Fix up the start offset of the attribute fork
*/
totsize -= size;
if (totsize == sizeof(xfs_attr_sf_hdr_t) &&
(mp->m_flags & XFS_MOUNT_ATTR2) &&
(dp->i_d.di_format != XFS_DINODE_FMT_BTREE) &&
!(args->op_flags & XFS_DA_OP_ADDNAME)) {
xfs_attr_fork_remove(dp, args->trans);
} else {
xfs_idata_realloc(dp, -size, XFS_ATTR_FORK);
dp->i_d.di_forkoff = xfs_attr_shortform_bytesfit(dp, totsize);
ASSERT(dp->i_d.di_forkoff);
ASSERT(totsize > sizeof(xfs_attr_sf_hdr_t) ||
(args->op_flags & XFS_DA_OP_ADDNAME) ||
!(mp->m_flags & XFS_MOUNT_ATTR2) ||
dp->i_d.di_format == XFS_DINODE_FMT_BTREE);
xfs_trans_log_inode(args->trans, dp,
XFS_ILOG_CORE | XFS_ILOG_ADATA);
}
xfs_sbversion_add_attr2(mp, args->trans);
return 0;
}
/*
* Look up a name in a shortform attribute list structure.
*/
/*ARGSUSED*/
int
xfs_attr_shortform_lookup(xfs_da_args_t *args)
{
xfs_attr_shortform_t *sf;
xfs_attr_sf_entry_t *sfe;
int i;
xfs_ifork_t *ifp;
trace_xfs_attr_sf_lookup(args);
ifp = args->dp->i_afp;
ASSERT(ifp->if_flags & XFS_IFINLINE);
sf = (xfs_attr_shortform_t *)ifp->if_u1.if_data;
sfe = &sf->list[0];
for (i = 0; i < sf->hdr.count;
sfe = XFS_ATTR_SF_NEXTENTRY(sfe), i++) {
if (sfe->namelen != args->namelen)
continue;
if (memcmp(args->name, sfe->nameval, args->namelen) != 0)
continue;
if (!xfs_attr_namesp_match(args->flags, sfe->flags))
continue;
return -EEXIST;
}
return -ENOATTR;
}
/*
* Look up a name in a shortform attribute list structure.
*/
/*ARGSUSED*/
int
xfs_attr_shortform_getvalue(xfs_da_args_t *args)
{
xfs_attr_shortform_t *sf;
xfs_attr_sf_entry_t *sfe;
int i;
ASSERT(args->dp->i_afp->if_flags == XFS_IFINLINE);
sf = (xfs_attr_shortform_t *)args->dp->i_afp->if_u1.if_data;
sfe = &sf->list[0];
for (i = 0; i < sf->hdr.count;
sfe = XFS_ATTR_SF_NEXTENTRY(sfe), i++) {
if (sfe->namelen != args->namelen)
continue;
if (memcmp(args->name, sfe->nameval, args->namelen) != 0)
continue;
if (!xfs_attr_namesp_match(args->flags, sfe->flags))
continue;
if (args->flags & ATTR_KERNOVAL) {
args->valuelen = sfe->valuelen;
return -EEXIST;
}
if (args->valuelen < sfe->valuelen) {
args->valuelen = sfe->valuelen;
return -ERANGE;
}
args->valuelen = sfe->valuelen;
memcpy(args->value, &sfe->nameval[args->namelen],
args->valuelen);
return -EEXIST;
}
return -ENOATTR;
}
/*
* Convert from using the shortform to the leaf.
*/
int
xfs_attr_shortform_to_leaf(xfs_da_args_t *args)
{
xfs_inode_t *dp;
xfs_attr_shortform_t *sf;
xfs_attr_sf_entry_t *sfe;
xfs_da_args_t nargs;
char *tmpbuffer;
int error, i, size;
xfs_dablk_t blkno;
struct xfs_buf *bp;
xfs_ifork_t *ifp;
trace_xfs_attr_sf_to_leaf(args);
dp = args->dp;
ifp = dp->i_afp;
sf = (xfs_attr_shortform_t *)ifp->if_u1.if_data;
size = be16_to_cpu(sf->hdr.totsize);
tmpbuffer = kmem_alloc(size, KM_SLEEP);
ASSERT(tmpbuffer != NULL);
memcpy(tmpbuffer, ifp->if_u1.if_data, size);
sf = (xfs_attr_shortform_t *)tmpbuffer;
xfs_idata_realloc(dp, -size, XFS_ATTR_FORK);
xfs_bmap_local_to_extents_empty(dp, XFS_ATTR_FORK);
bp = NULL;
error = xfs_da_grow_inode(args, &blkno);
if (error) {
/*
* If we hit an IO error middle of the transaction inside
* grow_inode(), we may have inconsistent data. Bail out.
*/
if (error == -EIO)
goto out;
xfs_idata_realloc(dp, size, XFS_ATTR_FORK); /* try to put */
memcpy(ifp->if_u1.if_data, tmpbuffer, size); /* it back */
goto out;
}
ASSERT(blkno == 0);
error = xfs_attr3_leaf_create(args, blkno, &bp);
if (error) {
error = xfs_da_shrink_inode(args, 0, bp);
bp = NULL;
if (error)
goto out;
xfs_idata_realloc(dp, size, XFS_ATTR_FORK); /* try to put */
memcpy(ifp->if_u1.if_data, tmpbuffer, size); /* it back */
goto out;
}
memset((char *)&nargs, 0, sizeof(nargs));
nargs.dp = dp;
nargs.geo = args->geo;
nargs.firstblock = args->firstblock;
nargs.flist = args->flist;
nargs.total = args->total;
nargs.whichfork = XFS_ATTR_FORK;
nargs.trans = args->trans;
nargs.op_flags = XFS_DA_OP_OKNOENT;
sfe = &sf->list[0];
for (i = 0; i < sf->hdr.count; i++) {
nargs.name = sfe->nameval;
nargs.namelen = sfe->namelen;
nargs.value = &sfe->nameval[nargs.namelen];
nargs.valuelen = sfe->valuelen;
nargs.hashval = xfs_da_hashname(sfe->nameval,
sfe->namelen);
nargs.flags = XFS_ATTR_NSP_ONDISK_TO_ARGS(sfe->flags);
error = xfs_attr3_leaf_lookup_int(bp, &nargs); /* set a->index */
ASSERT(error == -ENOATTR);
error = xfs_attr3_leaf_add(bp, &nargs);
ASSERT(error != -ENOSPC);
if (error)
goto out;
sfe = XFS_ATTR_SF_NEXTENTRY(sfe);
}
error = 0;
out:
kmem_free(tmpbuffer);
return error;
}
/*
* Check a leaf attribute block to see if all the entries would fit into
* a shortform attribute list.
*/
int
xfs_attr_shortform_allfit(
struct xfs_buf *bp,
struct xfs_inode *dp)
{
struct xfs_attr_leafblock *leaf;
struct xfs_attr_leaf_entry *entry;
xfs_attr_leaf_name_local_t *name_loc;
struct xfs_attr3_icleaf_hdr leafhdr;
int bytes;
int i;
struct xfs_mount *mp = bp->b_target->bt_mount;
leaf = bp->b_addr;
xfs_attr3_leaf_hdr_from_disk(mp->m_attr_geo, &leafhdr, leaf);
entry = xfs_attr3_leaf_entryp(leaf);
bytes = sizeof(struct xfs_attr_sf_hdr);
for (i = 0; i < leafhdr.count; entry++, i++) {
if (entry->flags & XFS_ATTR_INCOMPLETE)
continue; /* don't copy partial entries */
if (!(entry->flags & XFS_ATTR_LOCAL))
return 0;
name_loc = xfs_attr3_leaf_name_local(leaf, i);
if (name_loc->namelen >= XFS_ATTR_SF_ENTSIZE_MAX)
return 0;
if (be16_to_cpu(name_loc->valuelen) >= XFS_ATTR_SF_ENTSIZE_MAX)
return 0;
bytes += sizeof(struct xfs_attr_sf_entry) - 1
+ name_loc->namelen
+ be16_to_cpu(name_loc->valuelen);
}
if ((dp->i_mount->m_flags & XFS_MOUNT_ATTR2) &&
(dp->i_d.di_format != XFS_DINODE_FMT_BTREE) &&
(bytes == sizeof(struct xfs_attr_sf_hdr)))
return -1;
return xfs_attr_shortform_bytesfit(dp, bytes);
}
/*
* Convert a leaf attribute list to shortform attribute list
*/
int
xfs_attr3_leaf_to_shortform(
struct xfs_buf *bp,
struct xfs_da_args *args,
int forkoff)
{
struct xfs_attr_leafblock *leaf;
struct xfs_attr3_icleaf_hdr ichdr;
struct xfs_attr_leaf_entry *entry;
struct xfs_attr_leaf_name_local *name_loc;
struct xfs_da_args nargs;
struct xfs_inode *dp = args->dp;
char *tmpbuffer;
int error;
int i;
trace_xfs_attr_leaf_to_sf(args);
tmpbuffer = kmem_alloc(args->geo->blksize, KM_SLEEP);
if (!tmpbuffer)
return -ENOMEM;
memcpy(tmpbuffer, bp->b_addr, args->geo->blksize);
leaf = (xfs_attr_leafblock_t *)tmpbuffer;
xfs_attr3_leaf_hdr_from_disk(args->geo, &ichdr, leaf);
entry = xfs_attr3_leaf_entryp(leaf);
/* XXX (dgc): buffer is about to be marked stale - why zero it? */
memset(bp->b_addr, 0, args->geo->blksize);
/*
* Clean out the prior contents of the attribute list.
*/
error = xfs_da_shrink_inode(args, 0, bp);
if (error)
goto out;
if (forkoff == -1) {
ASSERT(dp->i_mount->m_flags & XFS_MOUNT_ATTR2);
ASSERT(dp->i_d.di_format != XFS_DINODE_FMT_BTREE);
xfs_attr_fork_remove(dp, args->trans);
goto out;
}
xfs_attr_shortform_create(args);
/*
* Copy the attributes
*/
memset((char *)&nargs, 0, sizeof(nargs));
nargs.geo = args->geo;
nargs.dp = dp;
nargs.firstblock = args->firstblock;
nargs.flist = args->flist;
nargs.total = args->total;
nargs.whichfork = XFS_ATTR_FORK;
nargs.trans = args->trans;
nargs.op_flags = XFS_DA_OP_OKNOENT;
for (i = 0; i < ichdr.count; entry++, i++) {
if (entry->flags & XFS_ATTR_INCOMPLETE)
continue; /* don't copy partial entries */
if (!entry->nameidx)
continue;
ASSERT(entry->flags & XFS_ATTR_LOCAL);
name_loc = xfs_attr3_leaf_name_local(leaf, i);
nargs.name = name_loc->nameval;
nargs.namelen = name_loc->namelen;
nargs.value = &name_loc->nameval[nargs.namelen];
nargs.valuelen = be16_to_cpu(name_loc->valuelen);
nargs.hashval = be32_to_cpu(entry->hashval);
nargs.flags = XFS_ATTR_NSP_ONDISK_TO_ARGS(entry->flags);
xfs_attr_shortform_add(&nargs, forkoff);
}
error = 0;
out:
kmem_free(tmpbuffer);
return error;
}
/*
* Convert from using a single leaf to a root node and a leaf.
*/
int
xfs_attr3_leaf_to_node(
struct xfs_da_args *args)
{
struct xfs_attr_leafblock *leaf;
struct xfs_attr3_icleaf_hdr icleafhdr;
struct xfs_attr_leaf_entry *entries;
struct xfs_da_node_entry *btree;
struct xfs_da3_icnode_hdr icnodehdr;
struct xfs_da_intnode *node;
struct xfs_inode *dp = args->dp;
struct xfs_mount *mp = dp->i_mount;
struct xfs_buf *bp1 = NULL;
struct xfs_buf *bp2 = NULL;
xfs_dablk_t blkno;
int error;
trace_xfs_attr_leaf_to_node(args);
error = xfs_da_grow_inode(args, &blkno);
if (error)
goto out;
error = xfs_attr3_leaf_read(args->trans, dp, 0, -1, &bp1);
if (error)
goto out;
error = xfs_da_get_buf(args->trans, dp, blkno, -1, &bp2, XFS_ATTR_FORK);
if (error)
goto out;
/* copy leaf to new buffer, update identifiers */
xfs_trans_buf_set_type(args->trans, bp2, XFS_BLFT_ATTR_LEAF_BUF);
bp2->b_ops = bp1->b_ops;
memcpy(bp2->b_addr, bp1->b_addr, args->geo->blksize);
if (xfs_sb_version_hascrc(&mp->m_sb)) {
struct xfs_da3_blkinfo *hdr3 = bp2->b_addr;
hdr3->blkno = cpu_to_be64(bp2->b_bn);
}
xfs_trans_log_buf(args->trans, bp2, 0, args->geo->blksize - 1);
/*
* Set up the new root node.
*/
error = xfs_da3_node_create(args, 0, 1, &bp1, XFS_ATTR_FORK);
if (error)