v4.19.13 snapshot.
diff --git a/fs/xfs/libxfs/xfs_dir2.c b/fs/xfs/libxfs/xfs_dir2.c
new file mode 100644
index 0000000..229152c
--- /dev/null
+++ b/fs/xfs/libxfs/xfs_dir2.c
@@ -0,0 +1,705 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2000-2001,2005 Silicon Graphics, Inc.
+ * All Rights Reserved.
+ */
+#include "xfs.h"
+#include "xfs_fs.h"
+#include "xfs_format.h"
+#include "xfs_log_format.h"
+#include "xfs_trans_resv.h"
+#include "xfs_mount.h"
+#include "xfs_defer.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.h"
+#include "xfs_dir2.h"
+#include "xfs_dir2_priv.h"
+#include "xfs_ialloc.h"
+#include "xfs_errortag.h"
+#include "xfs_error.h"
+#include "xfs_trace.h"
+
+struct xfs_name xfs_name_dotdot = { (unsigned char *)"..", 2, XFS_DIR3_FT_DIR };
+
+/*
+ * Convert inode mode to directory entry filetype
+ */
+unsigned char
+xfs_mode_to_ftype(
+ int mode)
+{
+ switch (mode & S_IFMT) {
+ case S_IFREG:
+ return XFS_DIR3_FT_REG_FILE;
+ case S_IFDIR:
+ return XFS_DIR3_FT_DIR;
+ case S_IFCHR:
+ return XFS_DIR3_FT_CHRDEV;
+ case S_IFBLK:
+ return XFS_DIR3_FT_BLKDEV;
+ case S_IFIFO:
+ return XFS_DIR3_FT_FIFO;
+ case S_IFSOCK:
+ return XFS_DIR3_FT_SOCK;
+ case S_IFLNK:
+ return XFS_DIR3_FT_SYMLINK;
+ default:
+ return XFS_DIR3_FT_UNKNOWN;
+ }
+}
+
+/*
+ * 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 const struct xfs_nameops xfs_ascii_ci_nameops = {
+ .hashname = xfs_ascii_ci_hashname,
+ .compname = xfs_ascii_ci_compname,
+};
+
+int
+xfs_da_mount(
+ struct xfs_mount *mp)
+{
+ struct xfs_da_geometry *dageo;
+ int nodehdr_size;
+
+
+ ASSERT(mp->m_sb.sb_versionnum & XFS_SB_VERSION_DIRV2BIT);
+ ASSERT(xfs_dir2_dirblock_bytes(&mp->m_sb) <= XFS_MAX_BLOCKSIZE);
+
+ mp->m_dir_inode_ops = xfs_dir_get_ops(mp, NULL);
+ mp->m_nondir_inode_ops = xfs_nondir_get_ops(mp, NULL);
+
+ nodehdr_size = mp->m_dir_inode_ops->node_hdr_size;
+ mp->m_dir_geo = kmem_zalloc(sizeof(struct xfs_da_geometry),
+ KM_SLEEP | KM_MAYFAIL);
+ mp->m_attr_geo = kmem_zalloc(sizeof(struct xfs_da_geometry),
+ KM_SLEEP | KM_MAYFAIL);
+ if (!mp->m_dir_geo || !mp->m_attr_geo) {
+ kmem_free(mp->m_dir_geo);
+ kmem_free(mp->m_attr_geo);
+ return -ENOMEM;
+ }
+
+ /* set up directory geometry */
+ dageo = mp->m_dir_geo;
+ dageo->blklog = mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog;
+ dageo->fsblog = mp->m_sb.sb_blocklog;
+ dageo->blksize = xfs_dir2_dirblock_bytes(&mp->m_sb);
+ dageo->fsbcount = 1 << mp->m_sb.sb_dirblklog;
+
+ /*
+ * Now we've set up the block conversion variables, we can calculate the
+ * segment block constants using the geometry structure.
+ */
+ dageo->datablk = xfs_dir2_byte_to_da(dageo, XFS_DIR2_DATA_OFFSET);
+ dageo->leafblk = xfs_dir2_byte_to_da(dageo, XFS_DIR2_LEAF_OFFSET);
+ dageo->freeblk = xfs_dir2_byte_to_da(dageo, XFS_DIR2_FREE_OFFSET);
+ dageo->node_ents = (dageo->blksize - nodehdr_size) /
+ (uint)sizeof(xfs_da_node_entry_t);
+ dageo->magicpct = (dageo->blksize * 37) / 100;
+
+ /* set up attribute geometry - single fsb only */
+ dageo = mp->m_attr_geo;
+ dageo->blklog = mp->m_sb.sb_blocklog;
+ dageo->fsblog = mp->m_sb.sb_blocklog;
+ dageo->blksize = 1 << dageo->blklog;
+ dageo->fsbcount = 1;
+ dageo->node_ents = (dageo->blksize - nodehdr_size) /
+ (uint)sizeof(xfs_da_node_entry_t);
+ dageo->magicpct = (dageo->blksize * 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 0;
+}
+
+void
+xfs_da_unmount(
+ struct xfs_mount *mp)
+{
+ kmem_free(mp->m_dir_geo);
+ kmem_free(mp->m_attr_geo);
+}
+
+/*
+ * Return 1 if directory contains only "." and "..".
+ */
+int
+xfs_dir_isempty(
+ xfs_inode_t *dp)
+{
+ xfs_dir2_sf_hdr_t *sfp;
+
+ ASSERT(S_ISDIR(VFS_I(dp)->i_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)
+{
+ bool ino_ok = xfs_verify_dir_ino(mp, ino);
+
+ if (unlikely(XFS_TEST_ERROR(!ino_ok, mp, XFS_ERRTAG_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 -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)
+{
+ struct xfs_da_args *args;
+ int error;
+
+ ASSERT(S_ISDIR(VFS_I(dp)->i_mode));
+ error = xfs_dir_ino_validate(tp->t_mountp, pdp->i_ino);
+ if (error)
+ return error;
+
+ args = kmem_zalloc(sizeof(*args), KM_SLEEP | KM_NOFS);
+ if (!args)
+ return -ENOMEM;
+
+ args->geo = dp->i_mount->m_dir_geo;
+ args->dp = dp;
+ args->trans = tp;
+ error = xfs_dir2_sf_create(args, pdp->i_ino);
+ kmem_free(args);
+ return error;
+}
+
+/*
+ * Enter a name in a directory, or check for available space.
+ * If inum is 0, only the available space test is performed.
+ */
+int
+xfs_dir_createname(
+ struct xfs_trans *tp,
+ struct xfs_inode *dp,
+ struct xfs_name *name,
+ xfs_ino_t inum, /* new entry inode number */
+ xfs_extlen_t total) /* bmap's total block count */
+{
+ struct xfs_da_args *args;
+ int rval;
+ int v; /* type-checking value */
+
+ ASSERT(S_ISDIR(VFS_I(dp)->i_mode));
+
+ if (inum) {
+ rval = xfs_dir_ino_validate(tp->t_mountp, inum);
+ if (rval)
+ return rval;
+ XFS_STATS_INC(dp->i_mount, xs_dir_create);
+ }
+
+ args = kmem_zalloc(sizeof(*args), KM_SLEEP | KM_NOFS);
+ if (!args)
+ return -ENOMEM;
+
+ args->geo = dp->i_mount->m_dir_geo;
+ args->name = name->name;
+ args->namelen = name->len;
+ args->filetype = name->type;
+ args->hashval = dp->i_mount->m_dirnameops->hashname(name);
+ args->inumber = inum;
+ args->dp = dp;
+ args->total = total;
+ args->whichfork = XFS_DATA_FORK;
+ args->trans = tp;
+ args->op_flags = XFS_DA_OP_ADDNAME | XFS_DA_OP_OKNOENT;
+ if (!inum)
+ args->op_flags |= XFS_DA_OP_JUSTCHECK;
+
+ if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) {
+ rval = xfs_dir2_sf_addname(args);
+ goto out_free;
+ }
+
+ rval = xfs_dir2_isblock(args, &v);
+ if (rval)
+ goto out_free;
+ if (v) {
+ rval = xfs_dir2_block_addname(args);
+ goto out_free;
+ }
+
+ rval = xfs_dir2_isleaf(args, &v);
+ if (rval)
+ goto out_free;
+ if (v)
+ rval = xfs_dir2_leaf_addname(args);
+ else
+ rval = xfs_dir2_node_addname(args);
+
+out_free:
+ kmem_free(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 */
+{
+ struct xfs_da_args *args;
+ int rval;
+ int v; /* type-checking value */
+ int lock_mode;
+
+ ASSERT(S_ISDIR(VFS_I(dp)->i_mode));
+ XFS_STATS_INC(dp->i_mount, xs_dir_lookup);
+
+ /*
+ * We need to use KM_NOFS here so that lockdep will not throw false
+ * positive deadlock warnings on a non-transactional lookup path. It is
+ * safe to recurse into inode recalim in that case, but lockdep can't
+ * easily be taught about it. Hence KM_NOFS avoids having to add more
+ * lockdep Doing this avoids having to add a bunch of lockdep class
+ * annotations into the reclaim path for the ilock.
+ */
+ args = kmem_zalloc(sizeof(*args), KM_SLEEP | KM_NOFS);
+ args->geo = dp->i_mount->m_dir_geo;
+ args->name = name->name;
+ args->namelen = name->len;
+ args->filetype = name->type;
+ 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;
+
+ lock_mode = xfs_ilock_data_map_shared(dp);
+ if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) {
+ rval = xfs_dir2_sf_lookup(args);
+ goto out_check_rval;
+ }
+
+ rval = xfs_dir2_isblock(args, &v);
+ if (rval)
+ goto out_free;
+ if (v) {
+ rval = xfs_dir2_block_lookup(args);
+ goto out_check_rval;
+ }
+
+ rval = xfs_dir2_isleaf(args, &v);
+ if (rval)
+ goto out_free;
+ if (v)
+ rval = xfs_dir2_leaf_lookup(args);
+ else
+ rval = xfs_dir2_node_lookup(args);
+
+out_check_rval:
+ if (rval == -EEXIST)
+ rval = 0;
+ if (!rval) {
+ *inum = args->inumber;
+ if (ci_name) {
+ ci_name->name = args->value;
+ ci_name->len = args->valuelen;
+ }
+ }
+out_free:
+ xfs_iunlock(dp, lock_mode);
+ kmem_free(args);
+ return rval;
+}
+
+/*
+ * Remove an entry from a directory.
+ */
+int
+xfs_dir_removename(
+ struct xfs_trans *tp,
+ struct xfs_inode *dp,
+ struct xfs_name *name,
+ xfs_ino_t ino,
+ xfs_extlen_t total) /* bmap's total block count */
+{
+ struct xfs_da_args *args;
+ int rval;
+ int v; /* type-checking value */
+
+ ASSERT(S_ISDIR(VFS_I(dp)->i_mode));
+ XFS_STATS_INC(dp->i_mount, xs_dir_remove);
+
+ args = kmem_zalloc(sizeof(*args), KM_SLEEP | KM_NOFS);
+ if (!args)
+ return -ENOMEM;
+
+ args->geo = dp->i_mount->m_dir_geo;
+ args->name = name->name;
+ args->namelen = name->len;
+ args->filetype = name->type;
+ args->hashval = dp->i_mount->m_dirnameops->hashname(name);
+ args->inumber = ino;
+ args->dp = dp;
+ 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);
+ goto out_free;
+ }
+
+ rval = xfs_dir2_isblock(args, &v);
+ if (rval)
+ goto out_free;
+ if (v) {
+ rval = xfs_dir2_block_removename(args);
+ goto out_free;
+ }
+
+ rval = xfs_dir2_isleaf(args, &v);
+ if (rval)
+ goto out_free;
+ if (v)
+ rval = xfs_dir2_leaf_removename(args);
+ else
+ rval = xfs_dir2_node_removename(args);
+out_free:
+ kmem_free(args);
+ return rval;
+}
+
+/*
+ * Replace the inode number of a directory entry.
+ */
+int
+xfs_dir_replace(
+ struct xfs_trans *tp,
+ struct xfs_inode *dp,
+ struct xfs_name *name, /* name of entry to replace */
+ xfs_ino_t inum, /* new inode number */
+ xfs_extlen_t total) /* bmap's total block count */
+{
+ struct xfs_da_args *args;
+ int rval;
+ int v; /* type-checking value */
+
+ ASSERT(S_ISDIR(VFS_I(dp)->i_mode));
+
+ rval = xfs_dir_ino_validate(tp->t_mountp, inum);
+ if (rval)
+ return rval;
+
+ args = kmem_zalloc(sizeof(*args), KM_SLEEP | KM_NOFS);
+ if (!args)
+ return -ENOMEM;
+
+ args->geo = dp->i_mount->m_dir_geo;
+ args->name = name->name;
+ args->namelen = name->len;
+ args->filetype = name->type;
+ args->hashval = dp->i_mount->m_dirnameops->hashname(name);
+ args->inumber = inum;
+ args->dp = dp;
+ 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);
+ goto out_free;
+ }
+
+ rval = xfs_dir2_isblock(args, &v);
+ if (rval)
+ goto out_free;
+ if (v) {
+ rval = xfs_dir2_block_replace(args);
+ goto out_free;
+ }
+
+ rval = xfs_dir2_isleaf(args, &v);
+ if (rval)
+ goto out_free;
+ if (v)
+ rval = xfs_dir2_leaf_replace(args);
+ else
+ rval = xfs_dir2_node_replace(args);
+out_free:
+ kmem_free(args);
+ return rval;
+}
+
+/*
+ * See if this entry can be added to the directory without allocating space.
+ */
+int
+xfs_dir_canenter(
+ xfs_trans_t *tp,
+ xfs_inode_t *dp,
+ struct xfs_name *name) /* name of entry to add */
+{
+ return xfs_dir_createname(tp, dp, name, 0, 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
+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 = args->geo->fsbcount;
+
+ error = xfs_da_grow_inode_int(args, &bno, count);
+ if (error)
+ return error;
+
+ *dbp = xfs_dir2_da_to_db(args->geo, (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(
+ struct xfs_da_args *args,
+ int *vp) /* out: 1 is block, 0 is not block */
+{
+ xfs_fileoff_t last; /* last file offset */
+ int rval;
+
+ if ((rval = xfs_bmap_last_offset(args->dp, &last, XFS_DATA_FORK)))
+ return rval;
+ rval = XFS_FSB_TO_B(args->dp->i_mount, last) == args->geo->blksize;
+ if (rval != 0 && args->dp->i_d.di_size != args->geo->blksize)
+ return -EFSCORRUPTED;
+ *vp = rval;
+ return 0;
+}
+
+/*
+ * See if the directory is a single-leaf form directory.
+ */
+int
+xfs_dir2_isleaf(
+ struct xfs_da_args *args,
+ int *vp) /* out: 1 is block, 0 is not block */
+{
+ xfs_fileoff_t last; /* last file offset */
+ int rval;
+
+ if ((rval = xfs_bmap_last_offset(args->dp, &last, XFS_DATA_FORK)))
+ return rval;
+ *vp = last == args->geo->leafblk + args->geo->fsbcount;
+ 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(
+ struct xfs_da_args *args,
+ xfs_dir2_db_t db,
+ struct xfs_buf *bp)
+{
+ xfs_fileoff_t bno; /* directory file offset */
+ xfs_dablk_t da; /* directory file offset */
+ int done; /* bunmap is finished */
+ struct xfs_inode *dp;
+ int error;
+ struct xfs_mount *mp;
+ struct xfs_trans *tp;
+
+ trace_xfs_dir2_shrink_inode(args, db);
+
+ dp = args->dp;
+ mp = dp->i_mount;
+ tp = args->trans;
+ da = xfs_dir2_db_to_da(args->geo, db);
+
+ /* Unmap the fsblock(s). */
+ error = xfs_bunmapi(tp, dp, da, args->geo->fsbcount, 0, 0, &done);
+ if (error) {
+ /*
+ * 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_trans_binval(tp, bp);
+ /*
+ * If it's not a data block, we're done.
+ */
+ if (db >= xfs_dir2_byte_to_db(args->geo, XFS_DIR2_LEAF_OFFSET))
+ 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(args->geo, 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 == args->geo->datablk)
+ 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;
+}