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- // 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_shared.h"
- #include "xfs_format.h"
- #include "xfs_log_format.h"
- #include "xfs_trans_resv.h"
- #include "xfs_mount.h"
- #include "xfs_inode.h"
- #include "xfs_trans.h"
- #include "xfs_bmap.h"
- #include "xfs_dir2.h"
- #include "xfs_dir2_priv.h"
- #include "xfs_errortag.h"
- #include "xfs_error.h"
- #include "xfs_trace.h"
- const struct xfs_name xfs_name_dotdot = {
- .name = (const unsigned char *)"..",
- .len = 2,
- .type = 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.
- */
- xfs_dahash_t
- xfs_ascii_ci_hashname(
- const 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;
- }
- 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;
- }
- int
- xfs_da_mount(
- struct xfs_mount *mp)
- {
- struct xfs_da_geometry *dageo;
- ASSERT(mp->m_sb.sb_versionnum & XFS_SB_VERSION_DIRV2BIT);
- ASSERT(xfs_dir2_dirblock_bytes(&mp->m_sb) <= XFS_MAX_BLOCKSIZE);
- mp->m_dir_geo = kmem_zalloc(sizeof(struct xfs_da_geometry),
- KM_MAYFAIL);
- mp->m_attr_geo = kmem_zalloc(sizeof(struct xfs_da_geometry),
- 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;
- if (xfs_has_crc(mp)) {
- dageo->node_hdr_size = sizeof(struct xfs_da3_node_hdr);
- dageo->leaf_hdr_size = sizeof(struct xfs_dir3_leaf_hdr);
- dageo->free_hdr_size = sizeof(struct xfs_dir3_free_hdr);
- dageo->data_entry_offset =
- sizeof(struct xfs_dir3_data_hdr);
- } else {
- dageo->node_hdr_size = sizeof(struct xfs_da_node_hdr);
- dageo->leaf_hdr_size = sizeof(struct xfs_dir2_leaf_hdr);
- dageo->free_hdr_size = sizeof(struct xfs_dir2_free_hdr);
- dageo->data_entry_offset =
- sizeof(struct xfs_dir2_data_hdr);
- }
- dageo->leaf_max_ents = (dageo->blksize - dageo->leaf_hdr_size) /
- sizeof(struct xfs_dir2_leaf_entry);
- dageo->free_max_bests = (dageo->blksize - dageo->free_hdr_size) /
- sizeof(xfs_dir2_data_off_t);
- dageo->data_first_offset = dageo->data_entry_offset +
- xfs_dir2_data_entsize(mp, 1) +
- xfs_dir2_data_entsize(mp, 2);
- /*
- * 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 - dageo->node_hdr_size) /
- (uint)sizeof(xfs_da_node_entry_t);
- dageo->max_extents = (XFS_DIR2_MAX_SPACES * XFS_DIR2_SPACE_SIZE) >>
- mp->m_sb.sb_blocklog;
- 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_hdr_size = mp->m_dir_geo->node_hdr_size;
- dageo->node_ents = (dageo->blksize - dageo->node_hdr_size) /
- (uint)sizeof(xfs_da_node_entry_t);
- if (xfs_has_large_extent_counts(mp))
- dageo->max_extents = XFS_MAX_EXTCNT_ATTR_FORK_LARGE;
- else
- dageo->max_extents = XFS_MAX_EXTCNT_ATTR_FORK_SMALL;
- dageo->magicpct = (dageo->blksize * 37) / 100;
- 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_disk_size == 0) /* might happen during shutdown. */
- return 1;
- if (dp->i_disk_size > xfs_inode_data_fork_size(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 (XFS_IS_CORRUPT(mp, !ino_ok) ||
- XFS_TEST_ERROR(false, mp, XFS_ERRTAG_DIR_INO_VALIDATE)) {
- xfs_warn(mp, "Invalid inode number 0x%Lx",
- (unsigned long long) ino);
- 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_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,
- const 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;
- bool v;
- 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_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 = xfs_dir2_hashname(dp->i_mount, 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_df.if_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(
- struct xfs_trans *tp,
- struct xfs_inode *dp,
- const 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;
- bool v;
- 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_NOFS);
- args->geo = dp->i_mount->m_dir_geo;
- args->name = name->name;
- args->namelen = name->len;
- args->filetype = name->type;
- args->hashval = xfs_dir2_hashname(dp->i_mount, 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_df.if_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;
- bool v;
- ASSERT(S_ISDIR(VFS_I(dp)->i_mode));
- XFS_STATS_INC(dp->i_mount, xs_dir_remove);
- args = kmem_zalloc(sizeof(*args), 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 = xfs_dir2_hashname(dp->i_mount, name);
- args->inumber = ino;
- args->dp = dp;
- args->total = total;
- args->whichfork = XFS_DATA_FORK;
- args->trans = tp;
- if (dp->i_df.if_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,
- const 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;
- bool v;
- 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_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 = xfs_dir2_hashname(dp->i_mount, name);
- args->inumber = inum;
- args->dp = dp;
- args->total = total;
- args->whichfork = XFS_DATA_FORK;
- args->trans = tp;
- if (dp->i_df.if_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_disk_size) {
- dp->i_disk_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,
- bool *isblock)
- {
- struct xfs_mount *mp = args->dp->i_mount;
- xfs_fileoff_t eof;
- int error;
- error = xfs_bmap_last_offset(args->dp, &eof, XFS_DATA_FORK);
- if (error)
- return error;
- *isblock = false;
- if (XFS_FSB_TO_B(mp, eof) != args->geo->blksize)
- return 0;
- *isblock = true;
- if (XFS_IS_CORRUPT(mp, args->dp->i_disk_size != args->geo->blksize))
- return -EFSCORRUPTED;
- return 0;
- }
- /*
- * See if the directory is a single-leaf form directory.
- */
- int
- xfs_dir2_isleaf(
- struct xfs_da_args *args,
- bool *isleaf)
- {
- xfs_fileoff_t eof;
- int error;
- error = xfs_bmap_last_offset(args->dp, &eof, XFS_DATA_FORK);
- if (error)
- return error;
- *isleaf = false;
- if (eof != args->geo->leafblk + args->geo->fsbcount)
- return 0;
- *isleaf = true;
- 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_disk_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_disk_size = XFS_FSB_TO_B(mp, bno);
- xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
- return 0;
- }
- /* Returns true if the directory entry name is valid. */
- bool
- xfs_dir2_namecheck(
- const void *name,
- size_t length)
- {
- /*
- * MAXNAMELEN includes the trailing null, but (name/length) leave it
- * out, so use >= for the length check.
- */
- if (length >= MAXNAMELEN)
- return false;
- /* There shouldn't be any slashes or nulls here */
- return !memchr(name, '/', length) && !memchr(name, 0, length);
- }
- xfs_dahash_t
- xfs_dir2_hashname(
- struct xfs_mount *mp,
- const struct xfs_name *name)
- {
- if (unlikely(xfs_has_asciici(mp)))
- return xfs_ascii_ci_hashname(name);
- return xfs_da_hashname(name->name, name->len);
- }
- enum xfs_dacmp
- xfs_dir2_compname(
- struct xfs_da_args *args,
- const unsigned char *name,
- int len)
- {
- if (unlikely(xfs_has_asciici(args->dp->i_mount)))
- return xfs_ascii_ci_compname(args, name, len);
- return xfs_da_compname(args, name, len);
- }
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