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linux/fs/xfs/xfs_dir.c
Linus Torvalds 1da177e4c3 Linux-2.6.12-rc2 
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!
2005-04-16 15:20:36 -07:00

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/*
* Copyright (c) 2000-2001 Silicon Graphics, Inc. All Rights Reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of version 2 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.
*
* Further, this software is distributed without any warranty that it is
* free of the rightful claim of any third person regarding infringement
* or the like. Any license provided herein, whether implied or
* otherwise, applies only to this software file. Patent licenses, if
* any, provided herein do not apply to combinations of this program with
* other software, or any other product whatsoever.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write the Free Software Foundation, Inc., 59
* Temple Place - Suite 330, Boston MA 02111-1307, USA.
*
* Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
* Mountain View, CA 94043, or:
*
* http://www.sgi.com
*
* For further information regarding this notice, see:
*
* http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
*/
#include "xfs.h"
#include "xfs_macros.h"
#include "xfs_types.h"
#include "xfs_inum.h"
#include "xfs_log.h"
#include "xfs_trans.h"
#include "xfs_sb.h"
#include "xfs_dir.h"
#include "xfs_dir2.h"
#include "xfs_dmapi.h"
#include "xfs_mount.h"
#include "xfs_alloc_btree.h"
#include "xfs_bmap_btree.h"
#include "xfs_ialloc_btree.h"
#include "xfs_alloc.h"
#include "xfs_btree.h"
#include "xfs_attr_sf.h"
#include "xfs_dir_sf.h"
#include "xfs_dir2_sf.h"
#include "xfs_dinode.h"
#include "xfs_inode.h"
#include "xfs_bmap.h"
#include "xfs_da_btree.h"
#include "xfs_dir_leaf.h"
#include "xfs_error.h"
/*
* xfs_dir.c
*
* Provide the external interfaces to manage directories.
*/
/*========================================================================
* Function prototypes for the kernel.
*========================================================================*/
/*
* Functions for the dirops interfaces.
*/
static void xfs_dir_mount(struct xfs_mount *mp);
static int xfs_dir_isempty(struct xfs_inode *dp);
static int xfs_dir_init(struct xfs_trans *trans,
struct xfs_inode *dir,
struct xfs_inode *parent_dir);
static int xfs_dir_createname(struct xfs_trans *trans,
struct xfs_inode *dp,
char *name_string,
int name_len,
xfs_ino_t inode_number,
xfs_fsblock_t *firstblock,
xfs_bmap_free_t *flist,
xfs_extlen_t total);
static int xfs_dir_lookup(struct xfs_trans *tp,
struct xfs_inode *dp,
char *name_string,
int name_length,
xfs_ino_t *inode_number);
static int xfs_dir_removename(struct xfs_trans *trans,
struct xfs_inode *dp,
char *name_string,
int name_length,
xfs_ino_t ino,
xfs_fsblock_t *firstblock,
xfs_bmap_free_t *flist,
xfs_extlen_t total);
static int xfs_dir_getdents(struct xfs_trans *tp,
struct xfs_inode *dp,
struct uio *uiop,
int *eofp);
static int xfs_dir_replace(struct xfs_trans *tp,
struct xfs_inode *dp,
char *name_string,
int name_length,
xfs_ino_t inode_number,
xfs_fsblock_t *firstblock,
xfs_bmap_free_t *flist,
xfs_extlen_t total);
static int xfs_dir_canenter(struct xfs_trans *tp,
struct xfs_inode *dp,
char *name_string,
int name_length);
static int xfs_dir_shortform_validate_ondisk(xfs_mount_t *mp,
xfs_dinode_t *dip);
xfs_dirops_t xfsv1_dirops = {
.xd_mount = xfs_dir_mount,
.xd_isempty = xfs_dir_isempty,
.xd_init = xfs_dir_init,
.xd_createname = xfs_dir_createname,
.xd_lookup = xfs_dir_lookup,
.xd_removename = xfs_dir_removename,
.xd_getdents = xfs_dir_getdents,
.xd_replace = xfs_dir_replace,
.xd_canenter = xfs_dir_canenter,
.xd_shortform_validate_ondisk = xfs_dir_shortform_validate_ondisk,
.xd_shortform_to_single = xfs_dir_shortform_to_leaf,
};
/*
* Internal routines when dirsize == XFS_LBSIZE(mp).
*/
STATIC int xfs_dir_leaf_lookup(xfs_da_args_t *args);
STATIC int xfs_dir_leaf_removename(xfs_da_args_t *args, int *number_entries,
int *total_namebytes);
STATIC int xfs_dir_leaf_getdents(xfs_trans_t *trans, xfs_inode_t *dp,
uio_t *uio, int *eofp,
xfs_dirent_t *dbp,
xfs_dir_put_t put);
STATIC int xfs_dir_leaf_replace(xfs_da_args_t *args);
/*
* Internal routines when dirsize > XFS_LBSIZE(mp).
*/
STATIC int xfs_dir_node_addname(xfs_da_args_t *args);
STATIC int xfs_dir_node_lookup(xfs_da_args_t *args);
STATIC int xfs_dir_node_removename(xfs_da_args_t *args);
STATIC int xfs_dir_node_getdents(xfs_trans_t *trans, xfs_inode_t *dp,
uio_t *uio, int *eofp,
xfs_dirent_t *dbp,
xfs_dir_put_t put);
STATIC int xfs_dir_node_replace(xfs_da_args_t *args);
#if defined(XFS_DIR_TRACE)
ktrace_t *xfs_dir_trace_buf;
#endif
/*========================================================================
* Overall external interface routines.
*========================================================================*/
xfs_dahash_t xfs_dir_hash_dot, xfs_dir_hash_dotdot;
/*
* One-time startup routine called from xfs_init().
*/
void
xfs_dir_startup(void)
{
xfs_dir_hash_dot = xfs_da_hashname(".", 1);
xfs_dir_hash_dotdot = xfs_da_hashname("..", 2);
}
/*
* Initialize directory-related fields in the mount structure.
*/
static void
xfs_dir_mount(xfs_mount_t *mp)
{
uint shortcount, leafcount, count;
mp->m_dirversion = 1;
shortcount = (mp->m_attroffset - (uint)sizeof(xfs_dir_sf_hdr_t)) /
(uint)sizeof(xfs_dir_sf_entry_t);
leafcount = (XFS_LBSIZE(mp) - (uint)sizeof(xfs_dir_leaf_hdr_t)) /
((uint)sizeof(xfs_dir_leaf_entry_t) +
(uint)sizeof(xfs_dir_leaf_name_t));
count = shortcount > leafcount ? shortcount : leafcount;
mp->m_dircook_elog = xfs_da_log2_roundup(count + 1);
ASSERT(mp->m_dircook_elog <= mp->m_sb.sb_blocklog);
mp->m_dir_node_ents = mp->m_attr_node_ents =
(XFS_LBSIZE(mp) - (uint)sizeof(xfs_da_node_hdr_t)) /
(uint)sizeof(xfs_da_node_entry_t);
mp->m_dir_magicpct = (XFS_LBSIZE(mp) * 37) / 100;
mp->m_dirblksize = mp->m_sb.sb_blocksize;
mp->m_dirblkfsbs = 1;
}
/*
* Return 1 if directory contains only "." and "..".
*/
static int
xfs_dir_isempty(xfs_inode_t *dp)
{
xfs_dir_sf_hdr_t *hdr;
ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
if (dp->i_d.di_size == 0)
return(1);
if (dp->i_d.di_size > XFS_IFORK_DSIZE(dp))
return(0);
hdr = (xfs_dir_sf_hdr_t *)dp->i_df.if_u1.if_data;
return(hdr->count == 0);
}
/*
* Initialize a directory with its "." and ".." entries.
*/
static int
xfs_dir_init(xfs_trans_t *trans, xfs_inode_t *dir, xfs_inode_t *parent_dir)
{
xfs_da_args_t args;
int error;
memset((char *)&args, 0, sizeof(args));
args.dp = dir;
args.trans = trans;
ASSERT((dir->i_d.di_mode & S_IFMT) == S_IFDIR);
if ((error = xfs_dir_ino_validate(trans->t_mountp, parent_dir->i_ino)))
return error;
return(xfs_dir_shortform_create(&args, parent_dir->i_ino));
}
/*
* Generic handler routine to add a name to a directory.
* Transitions directory from shortform to Btree as necessary.
*/
static int /* error */
xfs_dir_createname(xfs_trans_t *trans, xfs_inode_t *dp, char *name,
int namelen, xfs_ino_t inum, xfs_fsblock_t *firstblock,
xfs_bmap_free_t *flist, xfs_extlen_t total)
{
xfs_da_args_t args;
int retval, newsize, done;
ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
if ((retval = xfs_dir_ino_validate(trans->t_mountp, inum)))
return (retval);
XFS_STATS_INC(xs_dir_create);
/*
* Fill in the arg structure for this request.
*/
args.name = name;
args.namelen = namelen;
args.hashval = xfs_da_hashname(name, namelen);
args.inumber = inum;
args.dp = dp;
args.firstblock = firstblock;
args.flist = flist;
args.total = total;
args.whichfork = XFS_DATA_FORK;
args.trans = trans;
args.justcheck = 0;
args.addname = args.oknoent = 1;
/*
* Decide on what work routines to call based on the inode size.
*/
done = 0;
if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) {
newsize = XFS_DIR_SF_ENTSIZE_BYNAME(args.namelen);
if ((dp->i_d.di_size + newsize) <= XFS_IFORK_DSIZE(dp)) {
retval = xfs_dir_shortform_addname(&args);
done = 1;
} else {
if (total == 0)
return XFS_ERROR(ENOSPC);
retval = xfs_dir_shortform_to_leaf(&args);
done = retval != 0;
}
}
if (!done && xfs_bmap_one_block(dp, XFS_DATA_FORK)) {
retval = xfs_dir_leaf_addname(&args);
done = retval != ENOSPC;
if (!done) {
if (total == 0)
return XFS_ERROR(ENOSPC);
retval = xfs_dir_leaf_to_node(&args);
done = retval != 0;
}
}
if (!done) {
retval = xfs_dir_node_addname(&args);
}
return(retval);
}
/*
* Generic handler routine to check if a name can be added to a directory,
* without adding any blocks to the directory.
*/
static int /* error */
xfs_dir_canenter(xfs_trans_t *trans, xfs_inode_t *dp, char *name, int namelen)
{
xfs_da_args_t args;
int retval, newsize;
ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
/*
* Fill in the arg structure for this request.
*/
args.name = name;
args.namelen = namelen;
args.hashval = xfs_da_hashname(name, namelen);
args.inumber = 0;
args.dp = dp;
args.firstblock = NULL;
args.flist = NULL;
args.total = 0;
args.whichfork = XFS_DATA_FORK;
args.trans = trans;
args.justcheck = args.addname = args.oknoent = 1;
/*
* Decide on what work routines to call based on the inode size.
*/
if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) {
newsize = XFS_DIR_SF_ENTSIZE_BYNAME(args.namelen);
if ((dp->i_d.di_size + newsize) <= XFS_IFORK_DSIZE(dp))
retval = 0;
else
retval = XFS_ERROR(ENOSPC);
} else if (xfs_bmap_one_block(dp, XFS_DATA_FORK)) {
retval = xfs_dir_leaf_addname(&args);
} else {
retval = xfs_dir_node_addname(&args);
}
return(retval);
}
/*
* Generic handler routine to remove a name from a directory.
* Transitions directory from Btree to shortform as necessary.
*/
static int /* error */
xfs_dir_removename(xfs_trans_t *trans, xfs_inode_t *dp, char *name,
int namelen, xfs_ino_t ino, xfs_fsblock_t *firstblock,
xfs_bmap_free_t *flist, xfs_extlen_t total)
{
xfs_da_args_t args;
int count, totallen, newsize, retval;
ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
XFS_STATS_INC(xs_dir_remove);
/*
* Fill in the arg structure for this request.
*/
args.name = name;
args.namelen = namelen;
args.hashval = xfs_da_hashname(name, namelen);
args.inumber = ino;
args.dp = dp;
args.firstblock = firstblock;
args.flist = flist;
args.total = total;
args.whichfork = XFS_DATA_FORK;
args.trans = trans;
args.justcheck = args.addname = args.oknoent = 0;
/*
* Decide on what work routines to call based on the inode size.
*/
if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) {
retval = xfs_dir_shortform_removename(&args);
} else if (xfs_bmap_one_block(dp, XFS_DATA_FORK)) {
retval = xfs_dir_leaf_removename(&args, &count, &totallen);
if (retval == 0) {
newsize = XFS_DIR_SF_ALLFIT(count, totallen);
if (newsize <= XFS_IFORK_DSIZE(dp)) {
retval = xfs_dir_leaf_to_shortform(&args);
}
}
} else {
retval = xfs_dir_node_removename(&args);
}
return(retval);
}
static int /* error */
xfs_dir_lookup(xfs_trans_t *trans, xfs_inode_t *dp, char *name, int namelen,
xfs_ino_t *inum)
{
xfs_da_args_t args;
int retval;
ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
XFS_STATS_INC(xs_dir_lookup);
/*
* Fill in the arg structure for this request.
*/
args.name = name;
args.namelen = namelen;
args.hashval = xfs_da_hashname(name, namelen);
args.inumber = 0;
args.dp = dp;
args.firstblock = NULL;
args.flist = NULL;
args.total = 0;
args.whichfork = XFS_DATA_FORK;
args.trans = trans;
args.justcheck = args.addname = 0;
args.oknoent = 1;
/*
* Decide on what work routines to call based on the inode size.
*/
if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) {
retval = xfs_dir_shortform_lookup(&args);
} else if (xfs_bmap_one_block(dp, XFS_DATA_FORK)) {
retval = xfs_dir_leaf_lookup(&args);
} else {
retval = xfs_dir_node_lookup(&args);
}
if (retval == EEXIST)
retval = 0;
*inum = args.inumber;
return(retval);
}
/*
* Implement readdir.
*/
static int /* error */
xfs_dir_getdents(xfs_trans_t *trans, xfs_inode_t *dp, uio_t *uio, int *eofp)
{
xfs_dirent_t *dbp;
int alignment, retval;
xfs_dir_put_t put;
XFS_STATS_INC(xs_dir_getdents);
ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
/*
* If our caller has given us a single contiguous memory buffer,
* just work directly within that buffer. If it's in user memory,
* lock it down first.
*/
alignment = sizeof(xfs_off_t) - 1;
if ((uio->uio_iovcnt == 1) &&
(((__psint_t)uio->uio_iov[0].iov_base & alignment) == 0) &&
((uio->uio_iov[0].iov_len & alignment) == 0)) {
dbp = NULL;
put = xfs_dir_put_dirent64_direct;
} else {
dbp = kmem_alloc(sizeof(*dbp) + MAXNAMELEN, KM_SLEEP);
put = xfs_dir_put_dirent64_uio;
}
/*
* Decide on what work routines to call based on the inode size.
*/
*eofp = 0;
if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) {
retval = xfs_dir_shortform_getdents(dp, uio, eofp, dbp, put);
} else if (xfs_bmap_one_block(dp, XFS_DATA_FORK)) {
retval = xfs_dir_leaf_getdents(trans, dp, uio, eofp, dbp, put);
} else {
retval = xfs_dir_node_getdents(trans, dp, uio, eofp, dbp, put);
}
if (dbp != NULL)
kmem_free(dbp, sizeof(*dbp) + MAXNAMELEN);
return(retval);
}
static int /* error */
xfs_dir_replace(xfs_trans_t *trans, xfs_inode_t *dp, char *name, int namelen,
xfs_ino_t inum, xfs_fsblock_t *firstblock,
xfs_bmap_free_t *flist, xfs_extlen_t total)
{
xfs_da_args_t args;
int retval;
ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
if ((retval = xfs_dir_ino_validate(trans->t_mountp, inum)))
return retval;
/*
* Fill in the arg structure for this request.
*/
args.name = name;
args.namelen = namelen;
args.hashval = xfs_da_hashname(name, namelen);
args.inumber = inum;
args.dp = dp;
args.firstblock = firstblock;
args.flist = flist;
args.total = total;
args.whichfork = XFS_DATA_FORK;
args.trans = trans;
args.justcheck = args.addname = args.oknoent = 0;
/*
* Decide on what work routines to call based on the inode size.
*/
if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) {
retval = xfs_dir_shortform_replace(&args);
} else if (xfs_bmap_one_block(dp, XFS_DATA_FORK)) {
retval = xfs_dir_leaf_replace(&args);
} else {
retval = xfs_dir_node_replace(&args);
}
return(retval);
}
static int
xfs_dir_shortform_validate_ondisk(xfs_mount_t *mp, xfs_dinode_t *dp)
{
xfs_ino_t ino;
int namelen_sum;
int count;
xfs_dir_shortform_t *sf;
xfs_dir_sf_entry_t *sfe;
int i;
if ((INT_GET(dp->di_core.di_mode, ARCH_CONVERT) & S_IFMT) != S_IFDIR) {
return 0;
}
if (INT_GET(dp->di_core.di_format, ARCH_CONVERT) != XFS_DINODE_FMT_LOCAL) {
return 0;
}
if (INT_GET(dp->di_core.di_size, ARCH_CONVERT) < sizeof(sf->hdr)) {
xfs_fs_cmn_err(CE_WARN, mp, "Invalid shortform size: dp 0x%p",
dp);
return 1;
}
sf = (xfs_dir_shortform_t *)(&dp->di_u.di_dirsf);
ino = XFS_GET_DIR_INO8(sf->hdr.parent);
if (xfs_dir_ino_validate(mp, ino))
return 1;
count = sf->hdr.count;
if ((count < 0) || ((count * 10) > XFS_LITINO(mp))) {
xfs_fs_cmn_err(CE_WARN, mp,
"Invalid shortform count: dp 0x%p", dp);
return(1);
}
if (count == 0) {
return 0;
}
namelen_sum = 0;
sfe = &sf->list[0];
for (i = sf->hdr.count - 1; i >= 0; i--) {
ino = XFS_GET_DIR_INO8(sfe->inumber);
xfs_dir_ino_validate(mp, ino);
if (sfe->namelen >= XFS_LITINO(mp)) {
xfs_fs_cmn_err(CE_WARN, mp,
"Invalid shortform namelen: dp 0x%p", dp);
return 1;
}
namelen_sum += sfe->namelen;
sfe = XFS_DIR_SF_NEXTENTRY(sfe);
}
if (namelen_sum >= XFS_LITINO(mp)) {
xfs_fs_cmn_err(CE_WARN, mp,
"Invalid shortform namelen: dp 0x%p", dp);
return 1;
}
return 0;
}
/*========================================================================
* External routines when dirsize == XFS_LBSIZE(dp->i_mount).
*========================================================================*/
/*
* Add a name to the leaf directory structure
* This is the external routine.
*/
int
xfs_dir_leaf_addname(xfs_da_args_t *args)
{
int index, retval;
xfs_dabuf_t *bp;
retval = xfs_da_read_buf(args->trans, args->dp, 0, -1, &bp,
XFS_DATA_FORK);
if (retval)
return(retval);
ASSERT(bp != NULL);
retval = xfs_dir_leaf_lookup_int(bp, args, &index);
if (retval == ENOENT)
retval = xfs_dir_leaf_add(bp, args, index);
xfs_da_buf_done(bp);
return(retval);
}
/*
* Remove a name from the leaf directory structure
* This is the external routine.
*/
STATIC int
xfs_dir_leaf_removename(xfs_da_args_t *args, int *count, int *totallen)
{
xfs_dir_leafblock_t *leaf;
int index, retval;
xfs_dabuf_t *bp;
retval = xfs_da_read_buf(args->trans, args->dp, 0, -1, &bp,
XFS_DATA_FORK);
if (retval)
return(retval);
ASSERT(bp != NULL);
leaf = bp->data;
ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) == XFS_DIR_LEAF_MAGIC);
retval = xfs_dir_leaf_lookup_int(bp, args, &index);
if (retval == EEXIST) {
(void)xfs_dir_leaf_remove(args->trans, bp, index);
*count = INT_GET(leaf->hdr.count, ARCH_CONVERT);
*totallen = INT_GET(leaf->hdr.namebytes, ARCH_CONVERT);
retval = 0;
}
xfs_da_buf_done(bp);
return(retval);
}
/*
* Look up a name in a leaf directory structure.
* This is the external routine.
*/
STATIC int
xfs_dir_leaf_lookup(xfs_da_args_t *args)
{
int index, retval;
xfs_dabuf_t *bp;
retval = xfs_da_read_buf(args->trans, args->dp, 0, -1, &bp,
XFS_DATA_FORK);
if (retval)
return(retval);
ASSERT(bp != NULL);
retval = xfs_dir_leaf_lookup_int(bp, args, &index);
xfs_da_brelse(args->trans, bp);
return(retval);
}
/*
* Copy out directory entries for getdents(), for leaf directories.
*/
STATIC int
xfs_dir_leaf_getdents(xfs_trans_t *trans, xfs_inode_t *dp, uio_t *uio,
int *eofp, xfs_dirent_t *dbp, xfs_dir_put_t put)
{
xfs_dabuf_t *bp;
int retval, eob;
retval = xfs_da_read_buf(dp->i_transp, dp, 0, -1, &bp, XFS_DATA_FORK);
if (retval)
return(retval);
ASSERT(bp != NULL);
retval = xfs_dir_leaf_getdents_int(bp, dp, 0, uio, &eob, dbp, put, -1);
xfs_da_brelse(trans, bp);
*eofp = (eob == 0);
return(retval);
}
/*
* Look up a name in a leaf directory structure, replace the inode number.
* This is the external routine.
*/
STATIC int
xfs_dir_leaf_replace(xfs_da_args_t *args)
{
int index, retval;
xfs_dabuf_t *bp;
xfs_ino_t inum;
xfs_dir_leafblock_t *leaf;
xfs_dir_leaf_entry_t *entry;
xfs_dir_leaf_name_t *namest;
inum = args->inumber;
retval = xfs_da_read_buf(args->trans, args->dp, 0, -1, &bp,
XFS_DATA_FORK);
if (retval)
return(retval);
ASSERT(bp != NULL);
retval = xfs_dir_leaf_lookup_int(bp, args, &index);
if (retval == EEXIST) {
leaf = bp->data;
entry = &leaf->entries[index];
namest = XFS_DIR_LEAF_NAMESTRUCT(leaf, INT_GET(entry->nameidx, ARCH_CONVERT));
/* XXX - replace assert? */
XFS_DIR_SF_PUT_DIRINO(&inum, &namest->inumber);
xfs_da_log_buf(args->trans, bp,
XFS_DA_LOGRANGE(leaf, namest, sizeof(namest->inumber)));
xfs_da_buf_done(bp);
retval = 0;
} else
xfs_da_brelse(args->trans, bp);
return(retval);
}
/*========================================================================
* External routines when dirsize > XFS_LBSIZE(mp).
*========================================================================*/
/*
* Add a name to a Btree-format directory.
*
* This will involve walking down the Btree, and may involve splitting
* leaf nodes and even splitting intermediate nodes up to and including
* the root node (a special case of an intermediate node).
*/
STATIC int
xfs_dir_node_addname(xfs_da_args_t *args)
{
xfs_da_state_t *state;
xfs_da_state_blk_t *blk;
int retval, error;
/*
* Fill in bucket of arguments/results/context to carry around.
*/
state = xfs_da_state_alloc();
state->args = args;
state->mp = args->dp->i_mount;
state->blocksize = state->mp->m_sb.sb_blocksize;
state->node_ents = state->mp->m_dir_node_ents;
/*
* Search to see if name already exists, and get back a pointer
* to where it should go.
*/
error = xfs_da_node_lookup_int(state, &retval);
if (error)
retval = error;
if (retval != ENOENT)
goto error;
blk = &state->path.blk[ state->path.active-1 ];
ASSERT(blk->magic == XFS_DIR_LEAF_MAGIC);
retval = xfs_dir_leaf_add(blk->bp, args, blk->index);
if (retval == 0) {
/*
* Addition succeeded, update Btree hashvals.
*/
if (!args->justcheck)
xfs_da_fixhashpath(state, &state->path);
} else {
/*
* Addition failed, split as many Btree elements as required.
*/
if (args->total == 0) {
ASSERT(retval == ENOSPC);
goto error;
}
retval = xfs_da_split(state);
}
error:
xfs_da_state_free(state);
return(retval);
}
/*
* Remove a name from a B-tree directory.
*
* This will involve walking down the Btree, and may involve joining
* leaf nodes and even joining intermediate nodes up to and including
* the root node (a special case of an intermediate node).
*/
STATIC int
xfs_dir_node_removename(xfs_da_args_t *args)
{
xfs_da_state_t *state;
xfs_da_state_blk_t *blk;
int retval, error;
state = xfs_da_state_alloc();
state->args = args;
state->mp = args->dp->i_mount;
state->blocksize = state->mp->m_sb.sb_blocksize;
state->node_ents = state->mp->m_dir_node_ents;
/*
* Search to see if name exists, and get back a pointer to it.
*/
error = xfs_da_node_lookup_int(state, &retval);
if (error)
retval = error;
if (retval != EEXIST) {
xfs_da_state_free(state);
return(retval);
}
/*
* Remove the name and update the hashvals in the tree.
*/
blk = &state->path.blk[ state->path.active-1 ];
ASSERT(blk->magic == XFS_DIR_LEAF_MAGIC);
retval = xfs_dir_leaf_remove(args->trans, blk->bp, blk->index);
xfs_da_fixhashpath(state, &state->path);
/*
* Check to see if the tree needs to be collapsed.
*/
error = 0;
if (retval) {
error = xfs_da_join(state);
}
xfs_da_state_free(state);
if (error)
return(error);
return(0);
}
/*
* Look up a filename in a int directory.
* Use an internal routine to actually do all the work.
*/
STATIC int
xfs_dir_node_lookup(xfs_da_args_t *args)
{
xfs_da_state_t *state;
int retval, error, i;
state = xfs_da_state_alloc();
state->args = args;
state->mp = args->dp->i_mount;
state->blocksize = state->mp->m_sb.sb_blocksize;
state->node_ents = state->mp->m_dir_node_ents;
/*
* Search to see if name exists,
* and get back a pointer to it.
*/
error = xfs_da_node_lookup_int(state, &retval);
if (error) {
retval = error;
}
/*
* If not in a transaction, we have to release all the buffers.
*/
for (i = 0; i < state->path.active; i++) {
xfs_da_brelse(args->trans, state->path.blk[i].bp);
state->path.blk[i].bp = NULL;
}
xfs_da_state_free(state);
return(retval);
}
STATIC int
xfs_dir_node_getdents(xfs_trans_t *trans, xfs_inode_t *dp, uio_t *uio,
int *eofp, xfs_dirent_t *dbp, xfs_dir_put_t put)
{
xfs_da_intnode_t *node;
xfs_da_node_entry_t *btree;
xfs_dir_leafblock_t *leaf = NULL;
xfs_dablk_t bno, nextbno;
xfs_dahash_t cookhash;
xfs_mount_t *mp;
int error, eob, i;
xfs_dabuf_t *bp;
xfs_daddr_t nextda;
/*
* Pick up our context.
*/
mp = dp->i_mount;
bp = NULL;
bno = XFS_DA_COOKIE_BNO(mp, uio->uio_offset);
cookhash = XFS_DA_COOKIE_HASH(mp, uio->uio_offset);
xfs_dir_trace_g_du("node: start", dp, uio);
/*
* Re-find our place, even if we're confused about what our place is.
*
* First we check the block number from the magic cookie, it is a
* cache of where we ended last time. If we find a leaf block, and
* the starting hashval in that block is less than our desired
* hashval, then we run with it.
*/
if (bno > 0) {
error = xfs_da_read_buf(trans, dp, bno, -2, &bp, XFS_DATA_FORK);
if ((error != 0) && (error != EFSCORRUPTED))
return(error);
if (bp)
leaf = bp->data;
if (bp && INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) != XFS_DIR_LEAF_MAGIC) {
xfs_dir_trace_g_dub("node: block not a leaf",
dp, uio, bno);
xfs_da_brelse(trans, bp);
bp = NULL;
}
if (bp && INT_GET(leaf->entries[0].hashval, ARCH_CONVERT) > cookhash) {
xfs_dir_trace_g_dub("node: leaf hash too large",
dp, uio, bno);
xfs_da_brelse(trans, bp);
bp = NULL;
}
if (bp &&
cookhash > INT_GET(leaf->entries[INT_GET(leaf->hdr.count, ARCH_CONVERT) - 1].hashval, ARCH_CONVERT)) {
xfs_dir_trace_g_dub("node: leaf hash too small",
dp, uio, bno);
xfs_da_brelse(trans, bp);
bp = NULL;
}
}
/*
* If we did not find a leaf block from the blockno in the cookie,
* or we there was no blockno in the cookie (eg: first time thru),
* the we start at the top of the Btree and re-find our hashval.
*/
if (bp == NULL) {
xfs_dir_trace_g_du("node: start at root" , dp, uio);
bno = 0;
for (;;) {
error = xfs_da_read_buf(trans, dp, bno, -1, &bp,
XFS_DATA_FORK);
if (error)
return(error);
if (bp == NULL)
return(XFS_ERROR(EFSCORRUPTED));
node = bp->data;
if (INT_GET(node->hdr.info.magic, ARCH_CONVERT) != XFS_DA_NODE_MAGIC)
break;
btree = &node->btree[0];
xfs_dir_trace_g_dun("node: node detail", dp, uio, node);
for (i = 0; i < INT_GET(node->hdr.count, ARCH_CONVERT); btree++, i++) {
if (INT_GET(btree->hashval, ARCH_CONVERT) >= cookhash) {
bno = INT_GET(btree->before, ARCH_CONVERT);
break;
}
}
if (i == INT_GET(node->hdr.count, ARCH_CONVERT)) {
xfs_da_brelse(trans, bp);
xfs_dir_trace_g_du("node: hash beyond EOF",
dp, uio);
uio->uio_offset = XFS_DA_MAKE_COOKIE(mp, 0, 0,
XFS_DA_MAXHASH);
*eofp = 1;
return(0);
}
xfs_dir_trace_g_dub("node: going to block",
dp, uio, bno);
xfs_da_brelse(trans, bp);
}
}
ASSERT(cookhash != XFS_DA_MAXHASH);
/*
* We've dropped down to the (first) leaf block that contains the
* hashval we are interested in. Continue rolling upward thru the
* leaf blocks until we fill up our buffer.
*/
for (;;) {
leaf = bp->data;
if (unlikely(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) != XFS_DIR_LEAF_MAGIC)) {
xfs_dir_trace_g_dul("node: not a leaf", dp, uio, leaf);
xfs_da_brelse(trans, bp);
XFS_CORRUPTION_ERROR("xfs_dir_node_getdents(1)",
XFS_ERRLEVEL_LOW, mp, leaf);
return XFS_ERROR(EFSCORRUPTED);
}
xfs_dir_trace_g_dul("node: leaf detail", dp, uio, leaf);
if ((nextbno = INT_GET(leaf->hdr.info.forw, ARCH_CONVERT))) {
nextda = xfs_da_reada_buf(trans, dp, nextbno,
XFS_DATA_FORK);
} else
nextda = -1;
error = xfs_dir_leaf_getdents_int(bp, dp, bno, uio, &eob, dbp,
put, nextda);
xfs_da_brelse(trans, bp);
bno = nextbno;
if (eob) {
xfs_dir_trace_g_dub("node: E-O-B", dp, uio, bno);
*eofp = 0;
return(error);
}
if (bno == 0)
break;
error = xfs_da_read_buf(trans, dp, bno, nextda, &bp,
XFS_DATA_FORK);
if (error)
return(error);
if (unlikely(bp == NULL)) {
XFS_ERROR_REPORT("xfs_dir_node_getdents(2)",
XFS_ERRLEVEL_LOW, mp);
return(XFS_ERROR(EFSCORRUPTED));
}
}
*eofp = 1;
xfs_dir_trace_g_du("node: E-O-F", dp, uio);
return(0);
}
/*
* Look up a filename in an int directory, replace the inode number.
* Use an internal routine to actually do the lookup.
*/
STATIC int
xfs_dir_node_replace(xfs_da_args_t *args)
{
xfs_da_state_t *state;
xfs_da_state_blk_t *blk;
xfs_dir_leafblock_t *leaf;
xfs_dir_leaf_entry_t *entry;
xfs_dir_leaf_name_t *namest;
xfs_ino_t inum;
int retval, error, i;
xfs_dabuf_t *bp;
state = xfs_da_state_alloc();
state->args = args;
state->mp = args->dp->i_mount;
state->blocksize = state->mp->m_sb.sb_blocksize;
state->node_ents = state->mp->m_dir_node_ents;
inum = args->inumber;
/*
* Search to see if name exists,
* and get back a pointer to it.
*/
error = xfs_da_node_lookup_int(state, &retval);
if (error) {
retval = error;
}
if (retval == EEXIST) {
blk = &state->path.blk[state->path.active - 1];
ASSERT(blk->magic == XFS_DIR_LEAF_MAGIC);
bp = blk->bp;
leaf = bp->data;
entry = &leaf->entries[blk->index];
namest = XFS_DIR_LEAF_NAMESTRUCT(leaf, INT_GET(entry->nameidx, ARCH_CONVERT));
/* XXX - replace assert ? */
XFS_DIR_SF_PUT_DIRINO(&inum, &namest->inumber);
xfs_da_log_buf(args->trans, bp,
XFS_DA_LOGRANGE(leaf, namest, sizeof(namest->inumber)));
xfs_da_buf_done(bp);
blk->bp = NULL;
retval = 0;
} else {
i = state->path.active - 1;
xfs_da_brelse(args->trans, state->path.blk[i].bp);
state->path.blk[i].bp = NULL;
}
for (i = 0; i < state->path.active - 1; i++) {
xfs_da_brelse(args->trans, state->path.blk[i].bp);
state->path.blk[i].bp = NULL;
}
xfs_da_state_free(state);
return(retval);
}
#if defined(XFS_DIR_TRACE)
/*
* Add a trace buffer entry for an inode and a uio.
*/
void
xfs_dir_trace_g_du(char *where, xfs_inode_t *dp, uio_t *uio)
{
xfs_dir_trace_enter(XFS_DIR_KTRACE_G_DU, where,
(void *)dp, (void *)dp->i_mount,
(void *)((unsigned long)(uio->uio_offset >> 32)),
(void *)((unsigned long)(uio->uio_offset & 0xFFFFFFFF)),
(void *)(unsigned long)uio->uio_resid,
NULL, NULL, NULL, NULL, NULL, NULL, NULL);
}
/*
* Add a trace buffer entry for an inode and a uio.
*/
void
xfs_dir_trace_g_dub(char *where, xfs_inode_t *dp, uio_t *uio, xfs_dablk_t bno)
{
xfs_dir_trace_enter(XFS_DIR_KTRACE_G_DUB, where,
(void *)dp, (void *)dp->i_mount,
(void *)((unsigned long)(uio->uio_offset >> 32)),
(void *)((unsigned long)(uio->uio_offset & 0xFFFFFFFF)),
(void *)(unsigned long)uio->uio_resid,
(void *)(unsigned long)bno,
NULL, NULL, NULL, NULL, NULL, NULL);
}
/*
* Add a trace buffer entry for an inode and a uio.
*/
void
xfs_dir_trace_g_dun(char *where, xfs_inode_t *dp, uio_t *uio,
xfs_da_intnode_t *node)
{
int last = INT_GET(node->hdr.count, ARCH_CONVERT) - 1;
xfs_dir_trace_enter(XFS_DIR_KTRACE_G_DUN, where,
(void *)dp, (void *)dp->i_mount,
(void *)((unsigned long)(uio->uio_offset >> 32)),
(void *)((unsigned long)(uio->uio_offset & 0xFFFFFFFF)),
(void *)(unsigned long)uio->uio_resid,
(void *)(unsigned long)
INT_GET(node->hdr.info.forw, ARCH_CONVERT),
(void *)(unsigned long)
INT_GET(node->hdr.count, ARCH_CONVERT),
(void *)(unsigned long)
INT_GET(node->btree[0].hashval, ARCH_CONVERT),
(void *)(unsigned long)
INT_GET(node->btree[last].hashval, ARCH_CONVERT),
NULL, NULL, NULL);
}
/*
* Add a trace buffer entry for an inode and a uio.
*/
void
xfs_dir_trace_g_dul(char *where, xfs_inode_t *dp, uio_t *uio,
xfs_dir_leafblock_t *leaf)
{
int last = INT_GET(leaf->hdr.count, ARCH_CONVERT) - 1;
xfs_dir_trace_enter(XFS_DIR_KTRACE_G_DUL, where,
(void *)dp, (void *)dp->i_mount,
(void *)((unsigned long)(uio->uio_offset >> 32)),
(void *)((unsigned long)(uio->uio_offset & 0xFFFFFFFF)),
(void *)(unsigned long)uio->uio_resid,
(void *)(unsigned long)
INT_GET(leaf->hdr.info.forw, ARCH_CONVERT),
(void *)(unsigned long)
INT_GET(leaf->hdr.count, ARCH_CONVERT),
(void *)(unsigned long)
INT_GET(leaf->entries[0].hashval, ARCH_CONVERT),
(void *)(unsigned long)
INT_GET(leaf->entries[last].hashval, ARCH_CONVERT),
NULL, NULL, NULL);
}
/*
* Add a trace buffer entry for an inode and a uio.
*/
void
xfs_dir_trace_g_due(char *where, xfs_inode_t *dp, uio_t *uio,
xfs_dir_leaf_entry_t *entry)
{
xfs_dir_trace_enter(XFS_DIR_KTRACE_G_DUE, where,
(void *)dp, (void *)dp->i_mount,
(void *)((unsigned long)(uio->uio_offset >> 32)),
(void *)((unsigned long)(uio->uio_offset & 0xFFFFFFFF)),
(void *)(unsigned long)uio->uio_resid,
(void *)(unsigned long)
INT_GET(entry->hashval, ARCH_CONVERT),
NULL, NULL, NULL, NULL, NULL, NULL);
}
/*
* Add a trace buffer entry for an inode and a uio.
*/
void
xfs_dir_trace_g_duc(char *where, xfs_inode_t *dp, uio_t *uio, xfs_off_t cookie)
{
xfs_dir_trace_enter(XFS_DIR_KTRACE_G_DUC, where,
(void *)dp, (void *)dp->i_mount,
(void *)((unsigned long)(uio->uio_offset >> 32)),
(void *)((unsigned long)(uio->uio_offset & 0xFFFFFFFF)),
(void *)(unsigned long)uio->uio_resid,
(void *)((unsigned long)(cookie >> 32)),
(void *)((unsigned long)(cookie & 0xFFFFFFFF)),
NULL, NULL, NULL, NULL, NULL);
}
/*
* Add a trace buffer entry for the arguments given to the routine,
* generic form.
*/
void
xfs_dir_trace_enter(int type, char *where,
void * a0, void * a1,
void * a2, void * a3,
void * a4, void * a5,
void * a6, void * a7,
void * a8, void * a9,
void * a10, void * a11)
{
ASSERT(xfs_dir_trace_buf);
ktrace_enter(xfs_dir_trace_buf, (void *)(unsigned long)type,
(void *)where,
(void *)a0, (void *)a1, (void *)a2,
(void *)a3, (void *)a4, (void *)a5,
(void *)a6, (void *)a7, (void *)a8,
(void *)a9, (void *)a10, (void *)a11,
NULL, NULL);
}
#endif /* XFS_DIR_TRACE */
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