Moved, renamed, and deleted files

The original directory structure was scattered and unorganized.
Changes are basically to make it look like kernel structure.

1 files changed, 666 insertions, 0 deletions

diff --git a/fs/xfs/xfs_dir2.c b/fs/xfs/xfs_dir2.c
new file mode 100644
index 00000000..a2e27010
--- /dev/null
+++ b/fs/xfs/xfs_dir2.c
@@ -0,0 +1,666 @@
+/*
+ * Copyright (c) 2000-2001,2005 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 "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_sb.h"
+#include "xfs_ag.h"
+#include "xfs_mount.h"
+#include "xfs_da_btree.h"
+#include "xfs_bmap_btree.h"
+#include "xfs_alloc_btree.h"
+#include "xfs_dinode.h"
+#include "xfs_inode.h"
+#include "xfs_inode_item.h"
+#include "xfs_bmap.h"
+#include "xfs_dir2.h"
+#include "xfs_dir2_format.h"
+#include "xfs_dir2_priv.h"
+#include "xfs_error.h"
+#include "xfs_vnodeops.h"
+#include "xfs_trace.h"
+
+struct xfs_name xfs_name_dotdot = { (unsigned char *)"..", 2};
+
+/*
+ * ASCII case-insensitive (ie. A-Z) support for directories that was
+ * used in IRIX.
+ */
+STATIC xfs_dahash_t
+xfs_ascii_ci_hashname(
+	struct xfs_name	*name)
+{
+	xfs_dahash_t	hash;
+	int		i;
+
+	for (i = 0, hash = 0; i < name->len; i++)
+		hash = tolower(name->name[i]) ^ rol32(hash, 7);
+
+	return hash;
+}
+
+STATIC enum xfs_dacmp
+xfs_ascii_ci_compname(
+	struct xfs_da_args *args,
+	const unsigned char *name,
+	int		len)
+{
+	enum xfs_dacmp	result;
+	int		i;
+
+	if (args->namelen != len)
+		return XFS_CMP_DIFFERENT;
+
+	result = XFS_CMP_EXACT;
+	for (i = 0; i < len; i++) {
+		if (args->name[i] == name[i])
+			continue;
+		if (tolower(args->name[i]) != tolower(name[i]))
+			return XFS_CMP_DIFFERENT;
+		result = XFS_CMP_CASE;
+	}
+
+	return result;
+}
+
+static struct xfs_nameops xfs_ascii_ci_nameops = {
+	.hashname	= xfs_ascii_ci_hashname,
+	.compname	= xfs_ascii_ci_compname,
+};
+
+void
+xfs_dir_mount(
+	xfs_mount_t	*mp)
+{
+	ASSERT(xfs_sb_version_hasdirv2(&mp->m_sb));
+	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;
+	if (xfs_sb_version_hasasciici(&mp->m_sb))
+		mp->m_dirnameops = &xfs_ascii_ci_nameops;
+	else
+		mp->m_dirnameops = &xfs_default_nameops;
+}
+
+/*
+ * Return 1 if directory contains only "." and "..".
+ */
+int
+xfs_dir_isempty(
+	xfs_inode_t	*dp)
+{
+	xfs_dir2_sf_hdr_t	*sfp;
+
+	ASSERT(S_ISDIR(dp->i_d.di_mode));
+	if (dp->i_d.di_size == 0)	/* might happen during shutdown. */
+		return 1;
+	if (dp->i_d.di_size > XFS_IFORK_DSIZE(dp))
+		return 0;
+	sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
+	return !sfp->count;
+}
+
+/*
+ * Validate a given inode number.
+ */
+int
+xfs_dir_ino_validate(
+	xfs_mount_t	*mp,
+	xfs_ino_t	ino)
+{
+	xfs_agblock_t	agblkno;
+	xfs_agino_t	agino;
+	xfs_agnumber_t	agno;
+	int		ino_ok;
+	int		ioff;
+
+	agno = XFS_INO_TO_AGNO(mp, ino);
+	agblkno = XFS_INO_TO_AGBNO(mp, ino);
+	ioff = XFS_INO_TO_OFFSET(mp, ino);
+	agino = XFS_OFFBNO_TO_AGINO(mp, agblkno, ioff);
+	ino_ok =
+		agno < mp->m_sb.sb_agcount &&
+		agblkno < mp->m_sb.sb_agblocks &&
+		agblkno != 0 &&
+		ioff < (1 << mp->m_sb.sb_inopblog) &&
+		XFS_AGINO_TO_INO(mp, agno, agino) == ino;
+	if (unlikely(XFS_TEST_ERROR(!ino_ok, mp, XFS_ERRTAG_DIR_INO_VALIDATE,
+			XFS_RANDOM_DIR_INO_VALIDATE))) {
+		xfs_warn(mp, "Invalid inode number 0x%Lx",
+				(unsigned long long) ino);
+		XFS_ERROR_REPORT("xfs_dir_ino_validate", XFS_ERRLEVEL_LOW, mp);
+		return XFS_ERROR(EFSCORRUPTED);
+	}
+	return 0;
+}
+
+/*
+ * Initialize a directory with its "." and ".." entries.
+ */
+int
+xfs_dir_init(
+	xfs_trans_t	*tp,
+	xfs_inode_t	*dp,
+	xfs_inode_t	*pdp)
+{
+	xfs_da_args_t	args;
+	int		error;
+
+	memset((char *)&args, 0, sizeof(args));
+	args.dp = dp;
+	args.trans = tp;
+	ASSERT(S_ISDIR(dp->i_d.di_mode));
+	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.
+ */
+int
+xfs_dir_createname(
+	xfs_trans_t		*tp,
+	xfs_inode_t		*dp,
+	struct xfs_name		*name,
+	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;
+	int			rval;
+	int			v;		/* type-checking value */
+
+	ASSERT(S_ISDIR(dp->i_d.di_mode));
+	if ((rval = xfs_dir_ino_validate(tp->t_mountp, inum)))
+		return rval;
+	XFS_STATS_INC(xs_dir_create);
+
+	memset(&args, 0, sizeof(xfs_da_args_t));
+	args.name = name->name;
+	args.namelen = name->len;
+	args.hashval = dp->i_mount->m_dirnameops->hashname(name);
+	args.inumber = inum;
+	args.dp = dp;
+	args.firstblock = first;
+	args.flist = flist;
+	args.total = total;
+	args.whichfork = XFS_DATA_FORK;
+	args.trans = tp;
+	args.op_flags = XFS_DA_OP_ADDNAME | XFS_DA_OP_OKNOENT;
+
+	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;
+}
+
+/*
+ * If doing a CI lookup and case-insensitive match, dup actual name into
+ * args.value. Return EEXIST for success (ie. name found) or an error.
+ */
+int
+xfs_dir_cilookup_result(
+	struct xfs_da_args *args,
+	const unsigned char *name,
+	int		len)
+{
+	if (args->cmpresult == XFS_CMP_DIFFERENT)
+		return ENOENT;
+	if (args->cmpresult != XFS_CMP_CASE ||
+					!(args->op_flags & XFS_DA_OP_CILOOKUP))
+		return EEXIST;
+
+	args->value = kmem_alloc(len, KM_NOFS | KM_MAYFAIL);
+	if (!args->value)
+		return ENOMEM;
+
+	memcpy(args->value, name, len);
+	args->valuelen = len;
+	return EEXIST;
+}
+
+/*
+ * Lookup a name in a directory, give back the inode number.
+ * If ci_name is not NULL, returns the actual name in ci_name if it differs
+ * to name, or ci_name->name is set to NULL for an exact match.
+ */
+
+int
+xfs_dir_lookup(
+	xfs_trans_t	*tp,
+	xfs_inode_t	*dp,
+	struct xfs_name	*name,
+	xfs_ino_t	*inum,		/* out: inode number */
+	struct xfs_name *ci_name)	/* out: actual name if CI match */
+{
+	xfs_da_args_t	args;
+	int		rval;
+	int		v;		/* type-checking value */
+
+	ASSERT(S_ISDIR(dp->i_d.di_mode));
+	XFS_STATS_INC(xs_dir_lookup);
+
+	memset(&args, 0, sizeof(xfs_da_args_t));
+	args.name = name->name;
+	args.namelen = name->len;
+	args.hashval = dp->i_mount->m_dirnameops->hashname(name);
+	args.dp = dp;
+	args.whichfork = XFS_DATA_FORK;
+	args.trans = tp;
+	args.op_flags = XFS_DA_OP_OKNOENT;
+	if (ci_name)
+		args.op_flags |= XFS_DA_OP_CILOOKUP;
+
+	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) {
+		*inum = args.inumber;
+		if (ci_name) {
+			ci_name->name = args.value;
+			ci_name->len = args.valuelen;
+		}
+	}
+	return rval;
+}
+
+/*
+ * Remove an entry from a directory.
+ */
+int
+xfs_dir_removename(
+	xfs_trans_t	*tp,
+	xfs_inode_t	*dp,
+	struct xfs_name	*name,
+	xfs_ino_t	ino,
+	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;
+	int		rval;
+	int		v;		/* type-checking value */
+
+	ASSERT(S_ISDIR(dp->i_d.di_mode));
+	XFS_STATS_INC(xs_dir_remove);
+
+	memset(&args, 0, sizeof(xfs_da_args_t));
+	args.name = name->name;
+	args.namelen = name->len;
+	args.hashval = dp->i_mount->m_dirnameops->hashname(name);
+	args.inumber = ino;
+	args.dp = dp;
+	args.firstblock = first;
+	args.flist = flist;
+	args.total = total;
+	args.whichfork = XFS_DATA_FORK;
+	args.trans = tp;
+
+	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.
+ */
+int
+xfs_readdir(
+	xfs_inode_t	*dp,
+	void		*dirent,
+	size_t		bufsize,
+	xfs_off_t	*offset,
+	filldir_t	filldir)
+{
+	int		rval;		/* return value */
+	int		v;		/* type-checking value */
+
+	trace_xfs_readdir(dp);
+
+	if (XFS_FORCED_SHUTDOWN(dp->i_mount))
+		return XFS_ERROR(EIO);
+
+	ASSERT(S_ISDIR(dp->i_d.di_mode));
+	XFS_STATS_INC(xs_dir_getdents);
+
+	if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
+		rval = xfs_dir2_sf_getdents(dp, dirent, offset, filldir);
+	else if ((rval = xfs_dir2_isblock(NULL, dp, &v)))
+		;
+	else if (v)
+		rval = xfs_dir2_block_getdents(dp, dirent, offset, filldir);
+	else
+		rval = xfs_dir2_leaf_getdents(dp, dirent, bufsize, offset,
+					      filldir);
+	return rval;
+}
+
+/*
+ * Replace the inode number of a directory entry.
+ */
+int
+xfs_dir_replace(
+	xfs_trans_t	*tp,
+	xfs_inode_t	*dp,
+	struct xfs_name	*name,		/* name 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;
+	int		rval;
+	int		v;		/* type-checking value */
+
+	ASSERT(S_ISDIR(dp->i_d.di_mode));
+
+	if ((rval = xfs_dir_ino_validate(tp->t_mountp, inum)))
+		return rval;
+
+	memset(&args, 0, sizeof(xfs_da_args_t));
+	args.name = name->name;
+	args.namelen = name->len;
+	args.hashval = dp->i_mount->m_dirnameops->hashname(name);
+	args.inumber = inum;
+	args.dp = dp;
+	args.firstblock = first;
+	args.flist = flist;
+	args.total = total;
+	args.whichfork = XFS_DATA_FORK;
+	args.trans = tp;
+
+	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.
+ * First checks that the caller couldn't reserve enough space (resblks = 0).
+ */
+int
+xfs_dir_canenter(
+	xfs_trans_t	*tp,
+	xfs_inode_t	*dp,
+	struct xfs_name	*name,		/* name of entry to add */
+	uint		resblks)
+{
+	xfs_da_args_t	args;
+	int		rval;
+	int		v;		/* type-checking value */
+
+	if (resblks)
+		return 0;
+
+	ASSERT(S_ISDIR(dp->i_d.di_mode));
+
+	memset(&args, 0, sizeof(xfs_da_args_t));
+	args.name = name->name;
+	args.namelen = name->len;
+	args.hashval = dp->i_mount->m_dirnameops->hashname(name);
+	args.dp = dp;
+	args.whichfork = XFS_DATA_FORK;
+	args.trans = tp;
+	args.op_flags = XFS_DA_OP_JUSTCHECK | XFS_DA_OP_ADDNAME |
+							XFS_DA_OP_OKNOENT;
+
+	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;
+}
+
+/*
+ * 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
+xfs_dir2_grow_inode(
+	struct xfs_da_args	*args,
+	int			space,	/* v2 dir's space XFS_DIR2_xxx_SPACE */
+	xfs_dir2_db_t		*dbp)	/* out: block number added */
+{
+	struct xfs_inode	*dp = args->dp;
+	struct xfs_mount	*mp = dp->i_mount;
+	xfs_fileoff_t		bno;	/* directory offset of new block */
+	int			count;	/* count of filesystem blocks */
+	int			error;
+
+	trace_xfs_dir2_grow_inode(args, space);
+
+	/*
+	 * Set lowest possible block in the space requested.
+	 */
+	bno = XFS_B_TO_FSBT(mp, space * XFS_DIR2_SPACE_SIZE);
+	count = mp->m_dirblkfsbs;
+
+	error = xfs_da_grow_inode_int(args, &bno, count);
+	if (error)
+		return error;
+
+	*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(args->trans, dp, XFS_ILOG_CORE);
+		}
+	}
+	return 0;
+}
+
+/*
+ * See if the directory is a single-block form directory.
+ */
+int
+xfs_dir2_isblock(
+	xfs_trans_t	*tp,
+	xfs_inode_t	*dp,
+	int		*vp)		/* out: 1 is block, 0 is not block */
+{
+	xfs_fileoff_t	last;		/* last file offset */
+	xfs_mount_t	*mp;
+	int		rval;
+
+	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
+xfs_dir2_isleaf(
+	xfs_trans_t	*tp,
+	xfs_inode_t	*dp,
+	int		*vp)		/* out: 1 is leaf, 0 is not leaf */
+{
+	xfs_fileoff_t	last;		/* last file offset */
+	xfs_mount_t	*mp;
+	int		rval;
+
+	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;
+}
+
+/*
+ * 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,
+	xfs_dir2_db_t	db,
+	xfs_dabuf_t	*bp)
+{
+	xfs_fileoff_t	bno;		/* directory file offset */
+	xfs_dablk_t	da;		/* directory file offset */
+	int		done;		/* bunmap is finished */
+	xfs_inode_t	*dp;
+	int		error;
+	xfs_mount_t	*mp;
+	xfs_trans_t	*tp;
+
+	trace_xfs_dir2_shrink_inode(args, db);
+
+	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;
+}