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-rw-r--r--fs/xfs/xfs_dir2.c859
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diff --git a/fs/xfs/xfs_dir2.c b/fs/xfs/xfs_dir2.c
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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/
+ */
+
+/*
+ * XFS v2 directory implmentation.
+ * Top-level and utility routines.
+ */
+
+#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_ag.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_attr_sf.h"
+#include "xfs_dir_sf.h"
+#include "xfs_dir2_sf.h"
+#include "xfs_dinode.h"
+#include "xfs_inode_item.h"
+#include "xfs_inode.h"
+#include "xfs_bmap.h"
+#include "xfs_da_btree.h"
+#include "xfs_dir_leaf.h"
+#include "xfs_dir2_data.h"
+#include "xfs_dir2_leaf.h"
+#include "xfs_dir2_block.h"
+#include "xfs_dir2_node.h"
+#include "xfs_dir2_trace.h"
+#include "xfs_error.h"
+#include "xfs_bit.h"
+
+/*
+ * Declarations for interface routines.
+ */
+static void xfs_dir2_mount(xfs_mount_t *mp);
+static int xfs_dir2_isempty(xfs_inode_t *dp);
+static int xfs_dir2_init(xfs_trans_t *tp, xfs_inode_t *dp,
+ xfs_inode_t *pdp);
+static int xfs_dir2_createname(xfs_trans_t *tp, xfs_inode_t *dp,
+ char *name, int namelen, xfs_ino_t inum,
+ xfs_fsblock_t *first,
+ xfs_bmap_free_t *flist, xfs_extlen_t total);
+static int xfs_dir2_lookup(xfs_trans_t *tp, xfs_inode_t *dp, char *name,
+ int namelen, xfs_ino_t *inum);
+static int xfs_dir2_removename(xfs_trans_t *tp, xfs_inode_t *dp,
+ char *name, int namelen, xfs_ino_t ino,
+ xfs_fsblock_t *first,
+ xfs_bmap_free_t *flist, xfs_extlen_t total);
+static int xfs_dir2_getdents(xfs_trans_t *tp, xfs_inode_t *dp, uio_t *uio,
+ int *eofp);
+static int xfs_dir2_replace(xfs_trans_t *tp, xfs_inode_t *dp, char *name,
+ int namelen, xfs_ino_t inum,
+ xfs_fsblock_t *first, xfs_bmap_free_t *flist,
+ xfs_extlen_t total);
+static int xfs_dir2_canenter(xfs_trans_t *tp, xfs_inode_t *dp, char *name,
+ int namelen);
+static int xfs_dir2_shortform_validate_ondisk(xfs_mount_t *mp,
+ xfs_dinode_t *dip);
+
+/*
+ * Utility routine declarations.
+ */
+static int xfs_dir2_put_dirent64_direct(xfs_dir2_put_args_t *pa);
+static int xfs_dir2_put_dirent64_uio(xfs_dir2_put_args_t *pa);
+
+/*
+ * Directory operations vector.
+ */
+xfs_dirops_t xfsv2_dirops = {
+ .xd_mount = xfs_dir2_mount,
+ .xd_isempty = xfs_dir2_isempty,
+ .xd_init = xfs_dir2_init,
+ .xd_createname = xfs_dir2_createname,
+ .xd_lookup = xfs_dir2_lookup,
+ .xd_removename = xfs_dir2_removename,
+ .xd_getdents = xfs_dir2_getdents,
+ .xd_replace = xfs_dir2_replace,
+ .xd_canenter = xfs_dir2_canenter,
+ .xd_shortform_validate_ondisk = xfs_dir2_shortform_validate_ondisk,
+ .xd_shortform_to_single = xfs_dir2_sf_to_block,
+};
+
+/*
+ * Interface routines.
+ */
+
+/*
+ * Initialize directory-related fields in the mount structure.
+ */
+static void
+xfs_dir2_mount(
+ xfs_mount_t *mp) /* filesystem mount point */
+{
+ mp->m_dirversion = 2;
+ ASSERT((1 << (mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog)) <=
+ XFS_MAX_BLOCKSIZE);
+ mp->m_dirblksize = 1 << (mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog);
+ mp->m_dirblkfsbs = 1 << mp->m_sb.sb_dirblklog;
+ mp->m_dirdatablk = XFS_DIR2_DB_TO_DA(mp, XFS_DIR2_DATA_FIRSTDB(mp));
+ mp->m_dirleafblk = XFS_DIR2_DB_TO_DA(mp, XFS_DIR2_LEAF_FIRSTDB(mp));
+ mp->m_dirfreeblk = XFS_DIR2_DB_TO_DA(mp, XFS_DIR2_FREE_FIRSTDB(mp));
+ mp->m_attr_node_ents =
+ (mp->m_sb.sb_blocksize - (uint)sizeof(xfs_da_node_hdr_t)) /
+ (uint)sizeof(xfs_da_node_entry_t);
+ mp->m_dir_node_ents =
+ (mp->m_dirblksize - (uint)sizeof(xfs_da_node_hdr_t)) /
+ (uint)sizeof(xfs_da_node_entry_t);
+ mp->m_dir_magicpct = (mp->m_dirblksize * 37) / 100;
+}
+
+/*
+ * Return 1 if directory contains only "." and "..".
+ */
+static int /* return code */
+xfs_dir2_isempty(
+ xfs_inode_t *dp) /* incore inode structure */
+{
+ xfs_dir2_sf_t *sfp; /* shortform directory structure */
+
+ ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
+ /*
+ * Might happen during shutdown.
+ */
+ if (dp->i_d.di_size == 0) {
+ return 1;
+ }
+ if (dp->i_d.di_size > XFS_IFORK_DSIZE(dp))
+ return 0;
+ sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
+ return !sfp->hdr.count;
+}
+
+/*
+ * Initialize a directory with its "." and ".." entries.
+ */
+static int /* error */
+xfs_dir2_init(
+ xfs_trans_t *tp, /* transaction pointer */
+ xfs_inode_t *dp, /* incore directory inode */
+ xfs_inode_t *pdp) /* incore parent directory inode */
+{
+ xfs_da_args_t args; /* operation arguments */
+ int error; /* error return value */
+
+ memset((char *)&args, 0, sizeof(args));
+ args.dp = dp;
+ args.trans = tp;
+ ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
+ if ((error = xfs_dir_ino_validate(tp->t_mountp, pdp->i_ino))) {
+ return error;
+ }
+ return xfs_dir2_sf_create(&args, pdp->i_ino);
+}
+
+/*
+ Enter a name in a directory.
+ */
+static int /* error */
+xfs_dir2_createname(
+ xfs_trans_t *tp, /* transaction pointer */
+ xfs_inode_t *dp, /* incore directory inode */
+ char *name, /* new entry name */
+ int namelen, /* new entry name length */
+ xfs_ino_t inum, /* new entry inode number */
+ xfs_fsblock_t *first, /* bmap's firstblock */
+ xfs_bmap_free_t *flist, /* bmap's freeblock list */
+ xfs_extlen_t total) /* bmap's total block count */
+{
+ xfs_da_args_t args; /* operation arguments */
+ int rval; /* return value */
+ int v; /* type-checking value */
+
+ ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
+ if ((rval = xfs_dir_ino_validate(tp->t_mountp, inum))) {
+ return rval;
+ }
+ 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 = first;
+ args.flist = flist;
+ args.total = total;
+ args.whichfork = XFS_DATA_FORK;
+ args.trans = tp;
+ args.justcheck = 0;
+ 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)
+ rval = xfs_dir2_sf_addname(&args);
+ else if ((rval = xfs_dir2_isblock(tp, dp, &v))) {
+ return rval;
+ } else if (v)
+ rval = xfs_dir2_block_addname(&args);
+ else if ((rval = xfs_dir2_isleaf(tp, dp, &v))) {
+ return rval;
+ } else if (v)
+ rval = xfs_dir2_leaf_addname(&args);
+ else
+ rval = xfs_dir2_node_addname(&args);
+ return rval;
+}
+
+/*
+ * Lookup a name in a directory, give back the inode number.
+ */
+static int /* error */
+xfs_dir2_lookup(
+ xfs_trans_t *tp, /* transaction pointer */
+ xfs_inode_t *dp, /* incore directory inode */
+ char *name, /* lookup name */
+ int namelen, /* lookup name length */
+ xfs_ino_t *inum) /* out: inode number */
+{
+ xfs_da_args_t args; /* operation arguments */
+ int rval; /* return value */
+ int v; /* type-checking value */
+
+ 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 = tp;
+ 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)
+ rval = xfs_dir2_sf_lookup(&args);
+ else if ((rval = xfs_dir2_isblock(tp, dp, &v))) {
+ return rval;
+ } else if (v)
+ rval = xfs_dir2_block_lookup(&args);
+ else if ((rval = xfs_dir2_isleaf(tp, dp, &v))) {
+ return rval;
+ } else if (v)
+ rval = xfs_dir2_leaf_lookup(&args);
+ else
+ rval = xfs_dir2_node_lookup(&args);
+ if (rval == EEXIST)
+ rval = 0;
+ if (rval == 0)
+ *inum = args.inumber;
+ return rval;
+}
+
+/*
+ * Remove an entry from a directory.
+ */
+static int /* error */
+xfs_dir2_removename(
+ xfs_trans_t *tp, /* transaction pointer */
+ xfs_inode_t *dp, /* incore directory inode */
+ char *name, /* name of entry to remove */
+ int namelen, /* name length of entry to remove */
+ xfs_ino_t ino, /* inode number of entry to remove */
+ xfs_fsblock_t *first, /* bmap's firstblock */
+ xfs_bmap_free_t *flist, /* bmap's freeblock list */
+ xfs_extlen_t total) /* bmap's total block count */
+{
+ xfs_da_args_t args; /* operation arguments */
+ int rval; /* return value */
+ int v; /* type-checking value */
+
+ 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 = first;
+ args.flist = flist;
+ args.total = total;
+ args.whichfork = XFS_DATA_FORK;
+ args.trans = tp;
+ 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)
+ rval = xfs_dir2_sf_removename(&args);
+ else if ((rval = xfs_dir2_isblock(tp, dp, &v))) {
+ return rval;
+ } else if (v)
+ rval = xfs_dir2_block_removename(&args);
+ else if ((rval = xfs_dir2_isleaf(tp, dp, &v))) {
+ return rval;
+ } else if (v)
+ rval = xfs_dir2_leaf_removename(&args);
+ else
+ rval = xfs_dir2_node_removename(&args);
+ return rval;
+}
+
+/*
+ * Read a directory.
+ */
+static int /* error */
+xfs_dir2_getdents(
+ xfs_trans_t *tp, /* transaction pointer */
+ xfs_inode_t *dp, /* incore directory inode */
+ uio_t *uio, /* caller's buffer control */
+ int *eofp) /* out: eof reached */
+{
+ int alignment; /* alignment required for ABI */
+ xfs_dirent_t *dbp; /* malloc'ed buffer */
+ xfs_dir2_put_t put; /* entry formatting routine */
+ int rval; /* return value */
+ int v; /* type-checking value */
+
+ ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
+ XFS_STATS_INC(xs_dir_getdents);
+ /*
+ * If our caller has given us a single contiguous aligned 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_dir2_put_dirent64_direct;
+ } else {
+ dbp = kmem_alloc(sizeof(*dbp) + MAXNAMELEN, KM_SLEEP);
+ put = xfs_dir2_put_dirent64_uio;
+ }
+
+ *eofp = 0;
+ /*
+ * Decide on what work routines to call based on the inode size.
+ */
+ if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
+ rval = xfs_dir2_sf_getdents(dp, uio, eofp, dbp, put);
+ else if ((rval = xfs_dir2_isblock(tp, dp, &v))) {
+ ;
+ } else if (v)
+ rval = xfs_dir2_block_getdents(tp, dp, uio, eofp, dbp, put);
+ else
+ rval = xfs_dir2_leaf_getdents(tp, dp, uio, eofp, dbp, put);
+ if (dbp != NULL)
+ kmem_free(dbp, sizeof(*dbp) + MAXNAMELEN);
+ return rval;
+}
+
+/*
+ * Replace the inode number of a directory entry.
+ */
+static int /* error */
+xfs_dir2_replace(
+ xfs_trans_t *tp, /* transaction pointer */
+ xfs_inode_t *dp, /* incore directory inode */
+ char *name, /* name of entry to replace */
+ int namelen, /* name length of entry to replace */
+ xfs_ino_t inum, /* new inode number */
+ xfs_fsblock_t *first, /* bmap's firstblock */
+ xfs_bmap_free_t *flist, /* bmap's freeblock list */
+ xfs_extlen_t total) /* bmap's total block count */
+{
+ xfs_da_args_t args; /* operation arguments */
+ int rval; /* return value */
+ int v; /* type-checking value */
+
+ ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
+
+ if ((rval = xfs_dir_ino_validate(tp->t_mountp, inum))) {
+ return rval;
+ }
+ /*
+ * 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 = first;
+ args.flist = flist;
+ args.total = total;
+ args.whichfork = XFS_DATA_FORK;
+ args.trans = tp;
+ 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)
+ rval = xfs_dir2_sf_replace(&args);
+ else if ((rval = xfs_dir2_isblock(tp, dp, &v))) {
+ return rval;
+ } else if (v)
+ rval = xfs_dir2_block_replace(&args);
+ else if ((rval = xfs_dir2_isleaf(tp, dp, &v))) {
+ return rval;
+ } else if (v)
+ rval = xfs_dir2_leaf_replace(&args);
+ else
+ rval = xfs_dir2_node_replace(&args);
+ return rval;
+}
+
+/*
+ * See if this entry can be added to the directory without allocating space.
+ */
+static int /* error */
+xfs_dir2_canenter(
+ xfs_trans_t *tp, /* transaction pointer */
+ xfs_inode_t *dp, /* incore directory inode */
+ char *name, /* name of entry to add */
+ int namelen) /* name length of entry to add */
+{
+ xfs_da_args_t args; /* operation arguments */
+ int rval; /* return value */
+ int v; /* type-checking value */
+
+ 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 = tp;
+ 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)
+ rval = xfs_dir2_sf_addname(&args);
+ else if ((rval = xfs_dir2_isblock(tp, dp, &v))) {
+ return rval;
+ } else if (v)
+ rval = xfs_dir2_block_addname(&args);
+ else if ((rval = xfs_dir2_isleaf(tp, dp, &v))) {
+ return rval;
+ } else if (v)
+ rval = xfs_dir2_leaf_addname(&args);
+ else
+ rval = xfs_dir2_node_addname(&args);
+ return rval;
+}
+
+/*
+ * Dummy routine for shortform inode validation.
+ * Can't really do this.
+ */
+/* ARGSUSED */
+static int /* error */
+xfs_dir2_shortform_validate_ondisk(
+ xfs_mount_t *mp, /* filesystem mount point */
+ xfs_dinode_t *dip) /* ondisk inode */
+{
+ return 0;
+}
+
+/*
+ * Utility routines.
+ */
+
+/*
+ * Add a block to the directory.
+ * This routine is for data and free blocks, not leaf/node blocks
+ * which are handled by xfs_da_grow_inode.
+ */
+int /* error */
+xfs_dir2_grow_inode(
+ xfs_da_args_t *args, /* operation arguments */
+ int space, /* v2 dir's space XFS_DIR2_xxx_SPACE */
+ xfs_dir2_db_t *dbp) /* out: block number added */
+{
+ xfs_fileoff_t bno; /* directory offset of new block */
+ int count; /* count of filesystem blocks */
+ xfs_inode_t *dp; /* incore directory inode */
+ int error; /* error return value */
+ int got; /* blocks actually mapped */
+ int i; /* temp mapping index */
+ xfs_bmbt_irec_t map; /* single structure for bmap */
+ int mapi; /* mapping index */
+ xfs_bmbt_irec_t *mapp; /* bmap mapping structure(s) */
+ xfs_mount_t *mp; /* filesystem mount point */
+ int nmap; /* number of bmap entries */
+ xfs_trans_t *tp; /* transaction pointer */
+
+ xfs_dir2_trace_args_s("grow_inode", args, space);
+ dp = args->dp;
+ tp = args->trans;
+ mp = dp->i_mount;
+ /*
+ * Set lowest possible block in the space requested.
+ */
+ bno = XFS_B_TO_FSBT(mp, space * XFS_DIR2_SPACE_SIZE);
+ count = mp->m_dirblkfsbs;
+ /*
+ * Find the first hole for our block.
+ */
+ if ((error = xfs_bmap_first_unused(tp, dp, count, &bno, XFS_DATA_FORK))) {
+ return error;
+ }
+ nmap = 1;
+ ASSERT(args->firstblock != NULL);
+ /*
+ * Try mapping the new block contiguously (one extent).
+ */
+ if ((error = xfs_bmapi(tp, dp, bno, count,
+ XFS_BMAPI_WRITE|XFS_BMAPI_METADATA|XFS_BMAPI_CONTIG,
+ args->firstblock, args->total, &map, &nmap,
+ args->flist))) {
+ return error;
+ }
+ ASSERT(nmap <= 1);
+ /*
+ * Got it in 1.
+ */
+ if (nmap == 1) {
+ mapp = &map;
+ mapi = 1;
+ }
+ /*
+ * Didn't work and this is a multiple-fsb directory block.
+ * Try again with contiguous flag turned on.
+ */
+ else if (nmap == 0 && count > 1) {
+ xfs_fileoff_t b; /* current file offset */
+
+ /*
+ * Space for maximum number of mappings.
+ */
+ mapp = kmem_alloc(sizeof(*mapp) * count, KM_SLEEP);
+ /*
+ * Iterate until we get to the end of our block.
+ */
+ for (b = bno, mapi = 0; b < bno + count; ) {
+ int c; /* current fsb count */
+
+ /*
+ * Can't map more than MAX_NMAP at once.
+ */
+ nmap = MIN(XFS_BMAP_MAX_NMAP, count);
+ c = (int)(bno + count - b);
+ if ((error = xfs_bmapi(tp, dp, b, c,
+ XFS_BMAPI_WRITE|XFS_BMAPI_METADATA,
+ args->firstblock, args->total,
+ &mapp[mapi], &nmap, args->flist))) {
+ kmem_free(mapp, sizeof(*mapp) * count);
+ return error;
+ }
+ if (nmap < 1)
+ break;
+ /*
+ * Add this bunch into our table, go to the next offset.
+ */
+ mapi += nmap;
+ b = mapp[mapi - 1].br_startoff +
+ mapp[mapi - 1].br_blockcount;
+ }
+ }
+ /*
+ * Didn't work.
+ */
+ else {
+ mapi = 0;
+ mapp = NULL;
+ }
+ /*
+ * See how many fsb's we got.
+ */
+ for (i = 0, got = 0; i < mapi; i++)
+ got += mapp[i].br_blockcount;
+ /*
+ * Didn't get enough fsb's, or the first/last block's are wrong.
+ */
+ if (got != count || mapp[0].br_startoff != bno ||
+ mapp[mapi - 1].br_startoff + mapp[mapi - 1].br_blockcount !=
+ bno + count) {
+ if (mapp != &map)
+ kmem_free(mapp, sizeof(*mapp) * count);
+ return XFS_ERROR(ENOSPC);
+ }
+ /*
+ * Done with the temporary mapping table.
+ */
+ if (mapp != &map)
+ kmem_free(mapp, sizeof(*mapp) * count);
+ *dbp = XFS_DIR2_DA_TO_DB(mp, (xfs_dablk_t)bno);
+ /*
+ * Update file's size if this is the data space and it grew.
+ */
+ if (space == XFS_DIR2_DATA_SPACE) {
+ xfs_fsize_t size; /* directory file (data) size */
+
+ size = XFS_FSB_TO_B(mp, bno + count);
+ if (size > dp->i_d.di_size) {
+ dp->i_d.di_size = size;
+ xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
+ }
+ }
+ return 0;
+}
+
+/*
+ * See if the directory is a single-block form directory.
+ */
+int /* error */
+xfs_dir2_isblock(
+ xfs_trans_t *tp, /* transaction pointer */
+ xfs_inode_t *dp, /* incore directory inode */
+ int *vp) /* out: 1 is block, 0 is not block */
+{
+ xfs_fileoff_t last; /* last file offset */
+ xfs_mount_t *mp; /* filesystem mount point */
+ int rval; /* return value */
+
+ mp = dp->i_mount;
+ if ((rval = xfs_bmap_last_offset(tp, dp, &last, XFS_DATA_FORK))) {
+ return rval;
+ }
+ rval = XFS_FSB_TO_B(mp, last) == mp->m_dirblksize;
+ ASSERT(rval == 0 || dp->i_d.di_size == mp->m_dirblksize);
+ *vp = rval;
+ return 0;
+}
+
+/*
+ * See if the directory is a single-leaf form directory.
+ */
+int /* error */
+xfs_dir2_isleaf(
+ xfs_trans_t *tp, /* transaction pointer */
+ xfs_inode_t *dp, /* incore directory inode */
+ int *vp) /* out: 1 is leaf, 0 is not leaf */
+{
+ xfs_fileoff_t last; /* last file offset */
+ xfs_mount_t *mp; /* filesystem mount point */
+ int rval; /* return value */
+
+ mp = dp->i_mount;
+ if ((rval = xfs_bmap_last_offset(tp, dp, &last, XFS_DATA_FORK))) {
+ return rval;
+ }
+ *vp = last == mp->m_dirleafblk + (1 << mp->m_sb.sb_dirblklog);
+ return 0;
+}
+
+/*
+ * Getdents put routine for 64-bit ABI, direct form.
+ */
+static int /* error */
+xfs_dir2_put_dirent64_direct(
+ xfs_dir2_put_args_t *pa) /* argument bundle */
+{
+ xfs_dirent_t *idbp; /* dirent pointer */
+ iovec_t *iovp; /* io vector */
+ int namelen; /* entry name length */
+ int reclen; /* entry total length */
+ uio_t *uio; /* I/O control */
+
+ namelen = pa->namelen;
+ reclen = DIRENTSIZE(namelen);
+ uio = pa->uio;
+ /*
+ * Won't fit in the remaining space.
+ */
+ if (reclen > uio->uio_resid) {
+ pa->done = 0;
+ return 0;
+ }
+ iovp = uio->uio_iov;
+ idbp = (xfs_dirent_t *)iovp->iov_base;
+ iovp->iov_base = (char *)idbp + reclen;
+ iovp->iov_len -= reclen;
+ uio->uio_resid -= reclen;
+ idbp->d_reclen = reclen;
+ idbp->d_ino = pa->ino;
+ idbp->d_off = pa->cook;
+ idbp->d_name[namelen] = '\0';
+ pa->done = 1;
+ memcpy(idbp->d_name, pa->name, namelen);
+ return 0;
+}
+
+/*
+ * Getdents put routine for 64-bit ABI, uio form.
+ */
+static int /* error */
+xfs_dir2_put_dirent64_uio(
+ xfs_dir2_put_args_t *pa) /* argument bundle */
+{
+ xfs_dirent_t *idbp; /* dirent pointer */
+ int namelen; /* entry name length */
+ int reclen; /* entry total length */
+ int rval; /* return value */
+ uio_t *uio; /* I/O control */
+
+ namelen = pa->namelen;
+ reclen = DIRENTSIZE(namelen);
+ uio = pa->uio;
+ /*
+ * Won't fit in the remaining space.
+ */
+ if (reclen > uio->uio_resid) {
+ pa->done = 0;
+ return 0;
+ }
+ idbp = pa->dbp;
+ idbp->d_reclen = reclen;
+ idbp->d_ino = pa->ino;
+ idbp->d_off = pa->cook;
+ idbp->d_name[namelen] = '\0';
+ memcpy(idbp->d_name, pa->name, namelen);
+ rval = uio_read((caddr_t)idbp, reclen, uio);
+ pa->done = (rval == 0);
+ return rval;
+}
+
+/*
+ * Remove the given block from the directory.
+ * This routine is used for data and free blocks, leaf/node are done
+ * by xfs_da_shrink_inode.
+ */
+int
+xfs_dir2_shrink_inode(
+ xfs_da_args_t *args, /* operation arguments */
+ xfs_dir2_db_t db, /* directory block number */
+ xfs_dabuf_t *bp) /* block's buffer */
+{
+ xfs_fileoff_t bno; /* directory file offset */
+ xfs_dablk_t da; /* directory file offset */
+ int done; /* bunmap is finished */
+ xfs_inode_t *dp; /* incore directory inode */
+ int error; /* error return value */
+ xfs_mount_t *mp; /* filesystem mount point */
+ xfs_trans_t *tp; /* transaction pointer */
+
+ xfs_dir2_trace_args_db("shrink_inode", args, db, bp);
+ dp = args->dp;
+ mp = dp->i_mount;
+ tp = args->trans;
+ da = XFS_DIR2_DB_TO_DA(mp, db);
+ /*
+ * Unmap the fsblock(s).
+ */
+ if ((error = xfs_bunmapi(tp, dp, da, mp->m_dirblkfsbs,
+ XFS_BMAPI_METADATA, 0, args->firstblock, args->flist,
+ &done))) {
+ /*
+ * ENOSPC actually can happen if we're in a removename with
+ * no space reservation, and the resulting block removal
+ * would cause a bmap btree split or conversion from extents
+ * to btree. This can only happen for un-fragmented
+ * directory blocks, since you need to be punching out
+ * the middle of an extent.
+ * In this case we need to leave the block in the file,
+ * and not binval it.
+ * So the block has to be in a consistent empty state
+ * and appropriately logged.
+ * We don't free up the buffer, the caller can tell it
+ * hasn't happened since it got an error back.
+ */
+ return error;
+ }
+ ASSERT(done);
+ /*
+ * Invalidate the buffer from the transaction.
+ */
+ xfs_da_binval(tp, bp);
+ /*
+ * If it's not a data block, we're done.
+ */
+ if (db >= XFS_DIR2_LEAF_FIRSTDB(mp))
+ return 0;
+ /*
+ * If the block isn't the last one in the directory, we're done.
+ */
+ if (dp->i_d.di_size > XFS_DIR2_DB_OFF_TO_BYTE(mp, db + 1, 0))
+ return 0;
+ bno = da;
+ if ((error = xfs_bmap_last_before(tp, dp, &bno, XFS_DATA_FORK))) {
+ /*
+ * This can't really happen unless there's kernel corruption.
+ */
+ return error;
+ }
+ if (db == mp->m_dirdatablk)
+ ASSERT(bno == 0);
+ else
+ ASSERT(bno > 0);
+ /*
+ * Set the size to the new last block.
+ */
+ dp->i_d.di_size = XFS_FSB_TO_B(mp, bno);
+ xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
+ return 0;
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-20 03:50:43 +0000