10b61f8a4SDave Chinner // SPDX-License-Identifier: GPL-2.0 230f712c9SDave Chinner /* 330f712c9SDave Chinner * Copyright (c) 2000-2001,2005 Silicon Graphics, Inc. 430f712c9SDave Chinner * All Rights Reserved. 530f712c9SDave Chinner */ 630f712c9SDave Chinner #include "xfs.h" 730f712c9SDave Chinner #include "xfs_fs.h" 85467b34bSDarrick J. Wong #include "xfs_shared.h" 930f712c9SDave Chinner #include "xfs_format.h" 1030f712c9SDave Chinner #include "xfs_log_format.h" 1130f712c9SDave Chinner #include "xfs_trans_resv.h" 1230f712c9SDave Chinner #include "xfs_mount.h" 1330f712c9SDave Chinner #include "xfs_inode.h" 1430f712c9SDave Chinner #include "xfs_trans.h" 1530f712c9SDave Chinner #include "xfs_bmap.h" 1630f712c9SDave Chinner #include "xfs_dir2.h" 1730f712c9SDave Chinner #include "xfs_dir2_priv.h" 18e9e899a2SDarrick J. Wong #include "xfs_errortag.h" 1930f712c9SDave Chinner #include "xfs_error.h" 2030f712c9SDave Chinner #include "xfs_trace.h" 2130f712c9SDave Chinner 22744e6c8aSDarrick J. Wong const struct xfs_name xfs_name_dotdot = { 23744e6c8aSDarrick J. Wong .name = (const unsigned char *)"..", 24744e6c8aSDarrick J. Wong .len = 2, 25744e6c8aSDarrick J. Wong .type = XFS_DIR3_FT_DIR, 26744e6c8aSDarrick J. Wong }; 2730f712c9SDave Chinner 281b767ee3SDave Chinner /* 291fc4d33fSAmir Goldstein * Convert inode mode to directory entry filetype 301b767ee3SDave Chinner */ 31a5c46e5eSDarrick J. Wong unsigned char 32a5c46e5eSDarrick J. Wong xfs_mode_to_ftype( 33a5c46e5eSDarrick J. Wong int mode) 341fc4d33fSAmir Goldstein { 351fc4d33fSAmir Goldstein switch (mode & S_IFMT) { 361fc4d33fSAmir Goldstein case S_IFREG: 371fc4d33fSAmir Goldstein return XFS_DIR3_FT_REG_FILE; 381fc4d33fSAmir Goldstein case S_IFDIR: 391fc4d33fSAmir Goldstein return XFS_DIR3_FT_DIR; 401fc4d33fSAmir Goldstein case S_IFCHR: 411fc4d33fSAmir Goldstein return XFS_DIR3_FT_CHRDEV; 421fc4d33fSAmir Goldstein case S_IFBLK: 431fc4d33fSAmir Goldstein return XFS_DIR3_FT_BLKDEV; 441fc4d33fSAmir Goldstein case S_IFIFO: 451fc4d33fSAmir Goldstein return XFS_DIR3_FT_FIFO; 461fc4d33fSAmir Goldstein case S_IFSOCK: 471fc4d33fSAmir Goldstein return XFS_DIR3_FT_SOCK; 481fc4d33fSAmir Goldstein case S_IFLNK: 491fc4d33fSAmir Goldstein return XFS_DIR3_FT_SYMLINK; 501fc4d33fSAmir Goldstein default: 511fc4d33fSAmir Goldstein return XFS_DIR3_FT_UNKNOWN; 521fc4d33fSAmir Goldstein } 531fc4d33fSAmir Goldstein } 5430f712c9SDave Chinner 5530f712c9SDave Chinner /* 5630f712c9SDave Chinner * ASCII case-insensitive (ie. A-Z) support for directories that was 5730f712c9SDave Chinner * used in IRIX. 5830f712c9SDave Chinner */ 59d8d11fc7SChristoph Hellwig xfs_dahash_t 6030f712c9SDave Chinner xfs_ascii_ci_hashname( 61996b2329SDarrick J. Wong const struct xfs_name *name) 6230f712c9SDave Chinner { 6330f712c9SDave Chinner xfs_dahash_t hash; 6430f712c9SDave Chinner int i; 6530f712c9SDave Chinner 6630f712c9SDave Chinner for (i = 0, hash = 0; i < name->len; i++) 67a9248538SDarrick J. Wong hash = xfs_ascii_ci_xfrm(name->name[i]) ^ rol32(hash, 7); 6830f712c9SDave Chinner 6930f712c9SDave Chinner return hash; 7030f712c9SDave Chinner } 7130f712c9SDave Chinner 72d8d11fc7SChristoph Hellwig enum xfs_dacmp 7330f712c9SDave Chinner xfs_ascii_ci_compname( 7430f712c9SDave Chinner struct xfs_da_args *args, 7530f712c9SDave Chinner const unsigned char *name, 7630f712c9SDave Chinner int len) 7730f712c9SDave Chinner { 7830f712c9SDave Chinner enum xfs_dacmp result; 7930f712c9SDave Chinner int i; 8030f712c9SDave Chinner 8130f712c9SDave Chinner if (args->namelen != len) 8230f712c9SDave Chinner return XFS_CMP_DIFFERENT; 8330f712c9SDave Chinner 8430f712c9SDave Chinner result = XFS_CMP_EXACT; 8530f712c9SDave Chinner for (i = 0; i < len; i++) { 8630f712c9SDave Chinner if (args->name[i] == name[i]) 8730f712c9SDave Chinner continue; 88a9248538SDarrick J. Wong if (xfs_ascii_ci_xfrm(args->name[i]) != 89a9248538SDarrick J. Wong xfs_ascii_ci_xfrm(name[i])) 9030f712c9SDave Chinner return XFS_CMP_DIFFERENT; 9130f712c9SDave Chinner result = XFS_CMP_CASE; 9230f712c9SDave Chinner } 9330f712c9SDave Chinner 9430f712c9SDave Chinner return result; 9530f712c9SDave Chinner } 9630f712c9SDave Chinner 9730f712c9SDave Chinner int 9830f712c9SDave Chinner xfs_da_mount( 9930f712c9SDave Chinner struct xfs_mount *mp) 10030f712c9SDave Chinner { 10130f712c9SDave Chinner struct xfs_da_geometry *dageo; 10230f712c9SDave Chinner 10330f712c9SDave Chinner 10430f712c9SDave Chinner ASSERT(mp->m_sb.sb_versionnum & XFS_SB_VERSION_DIRV2BIT); 105ac503a4cSDarrick J. Wong ASSERT(xfs_dir2_dirblock_bytes(&mp->m_sb) <= XFS_MAX_BLOCKSIZE); 10630f712c9SDave Chinner 10710634530SDave Chinner mp->m_dir_geo = kzalloc(sizeof(struct xfs_da_geometry), 10810634530SDave Chinner GFP_KERNEL | __GFP_RETRY_MAYFAIL); 10910634530SDave Chinner mp->m_attr_geo = kzalloc(sizeof(struct xfs_da_geometry), 11010634530SDave Chinner GFP_KERNEL | __GFP_RETRY_MAYFAIL); 11130f712c9SDave Chinner if (!mp->m_dir_geo || !mp->m_attr_geo) { 112d4c75a1bSDave Chinner kfree(mp->m_dir_geo); 113d4c75a1bSDave Chinner kfree(mp->m_attr_geo); 1142451337dSDave Chinner return -ENOMEM; 11530f712c9SDave Chinner } 11630f712c9SDave Chinner 11730f712c9SDave Chinner /* set up directory geometry */ 11830f712c9SDave Chinner dageo = mp->m_dir_geo; 11930f712c9SDave Chinner dageo->blklog = mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog; 12030f712c9SDave Chinner dageo->fsblog = mp->m_sb.sb_blocklog; 121ac503a4cSDarrick J. Wong dageo->blksize = xfs_dir2_dirblock_bytes(&mp->m_sb); 12230f712c9SDave Chinner dageo->fsbcount = 1 << mp->m_sb.sb_dirblklog; 123ebd9027dSDave Chinner if (xfs_has_crc(mp)) { 1243b344413SChristoph Hellwig dageo->node_hdr_size = sizeof(struct xfs_da3_node_hdr); 125545910bcSChristoph Hellwig dageo->leaf_hdr_size = sizeof(struct xfs_dir3_leaf_hdr); 126ed1d612fSChristoph Hellwig dageo->free_hdr_size = sizeof(struct xfs_dir3_free_hdr); 127d73e1ceeSChristoph Hellwig dageo->data_entry_offset = 128d73e1ceeSChristoph Hellwig sizeof(struct xfs_dir3_data_hdr); 129545910bcSChristoph Hellwig } else { 1303b344413SChristoph Hellwig dageo->node_hdr_size = sizeof(struct xfs_da_node_hdr); 131545910bcSChristoph Hellwig dageo->leaf_hdr_size = sizeof(struct xfs_dir2_leaf_hdr); 132ed1d612fSChristoph Hellwig dageo->free_hdr_size = sizeof(struct xfs_dir2_free_hdr); 133d73e1ceeSChristoph Hellwig dageo->data_entry_offset = 134d73e1ceeSChristoph Hellwig sizeof(struct xfs_dir2_data_hdr); 135545910bcSChristoph Hellwig } 136478c7835SChristoph Hellwig dageo->leaf_max_ents = (dageo->blksize - dageo->leaf_hdr_size) / 137478c7835SChristoph Hellwig sizeof(struct xfs_dir2_leaf_entry); 1385893e4feSChristoph Hellwig dageo->free_max_bests = (dageo->blksize - dageo->free_hdr_size) / 1395893e4feSChristoph Hellwig sizeof(xfs_dir2_data_off_t); 14030f712c9SDave Chinner 141d73e1ceeSChristoph Hellwig dageo->data_first_offset = dageo->data_entry_offset + 142d73e1ceeSChristoph Hellwig xfs_dir2_data_entsize(mp, 1) + 143d73e1ceeSChristoph Hellwig xfs_dir2_data_entsize(mp, 2); 144d73e1ceeSChristoph Hellwig 14530f712c9SDave Chinner /* 14630f712c9SDave Chinner * Now we've set up the block conversion variables, we can calculate the 14730f712c9SDave Chinner * segment block constants using the geometry structure. 14830f712c9SDave Chinner */ 14930f712c9SDave Chinner dageo->datablk = xfs_dir2_byte_to_da(dageo, XFS_DIR2_DATA_OFFSET); 15030f712c9SDave Chinner dageo->leafblk = xfs_dir2_byte_to_da(dageo, XFS_DIR2_LEAF_OFFSET); 15130f712c9SDave Chinner dageo->freeblk = xfs_dir2_byte_to_da(dageo, XFS_DIR2_FREE_OFFSET); 1523b344413SChristoph Hellwig dageo->node_ents = (dageo->blksize - dageo->node_hdr_size) / 15330f712c9SDave Chinner (uint)sizeof(xfs_da_node_entry_t); 15483a21c18SChandan Babu R dageo->max_extents = (XFS_DIR2_MAX_SPACES * XFS_DIR2_SPACE_SIZE) >> 15583a21c18SChandan Babu R mp->m_sb.sb_blocklog; 15630f712c9SDave Chinner dageo->magicpct = (dageo->blksize * 37) / 100; 15730f712c9SDave Chinner 15830f712c9SDave Chinner /* set up attribute geometry - single fsb only */ 15930f712c9SDave Chinner dageo = mp->m_attr_geo; 16030f712c9SDave Chinner dageo->blklog = mp->m_sb.sb_blocklog; 16130f712c9SDave Chinner dageo->fsblog = mp->m_sb.sb_blocklog; 16230f712c9SDave Chinner dageo->blksize = 1 << dageo->blklog; 16330f712c9SDave Chinner dageo->fsbcount = 1; 1643b344413SChristoph Hellwig dageo->node_hdr_size = mp->m_dir_geo->node_hdr_size; 1653b344413SChristoph Hellwig dageo->node_ents = (dageo->blksize - dageo->node_hdr_size) / 16630f712c9SDave Chinner (uint)sizeof(xfs_da_node_entry_t); 16783a21c18SChandan Babu R 16883a21c18SChandan Babu R if (xfs_has_large_extent_counts(mp)) 16983a21c18SChandan Babu R dageo->max_extents = XFS_MAX_EXTCNT_ATTR_FORK_LARGE; 17083a21c18SChandan Babu R else 17183a21c18SChandan Babu R dageo->max_extents = XFS_MAX_EXTCNT_ATTR_FORK_SMALL; 17283a21c18SChandan Babu R 17330f712c9SDave Chinner dageo->magicpct = (dageo->blksize * 37) / 100; 17430f712c9SDave Chinner return 0; 17530f712c9SDave Chinner } 17630f712c9SDave Chinner 17730f712c9SDave Chinner void 17830f712c9SDave Chinner xfs_da_unmount( 17930f712c9SDave Chinner struct xfs_mount *mp) 18030f712c9SDave Chinner { 181d4c75a1bSDave Chinner kfree(mp->m_dir_geo); 182d4c75a1bSDave Chinner kfree(mp->m_attr_geo); 18330f712c9SDave Chinner } 18430f712c9SDave Chinner 18530f712c9SDave Chinner /* 18630f712c9SDave Chinner * Return 1 if directory contains only "." and "..". 18730f712c9SDave Chinner */ 18830f712c9SDave Chinner int 18930f712c9SDave Chinner xfs_dir_isempty( 19030f712c9SDave Chinner xfs_inode_t *dp) 19130f712c9SDave Chinner { 19230f712c9SDave Chinner xfs_dir2_sf_hdr_t *sfp; 19330f712c9SDave Chinner 194c19b3b05SDave Chinner ASSERT(S_ISDIR(VFS_I(dp)->i_mode)); 19513d2c10bSChristoph Hellwig if (dp->i_disk_size == 0) /* might happen during shutdown. */ 19630f712c9SDave Chinner return 1; 197c01147d9SDarrick J. Wong if (dp->i_disk_size > xfs_inode_data_fork_size(dp)) 19830f712c9SDave Chinner return 0; 1996e145f94SChristoph Hellwig sfp = dp->i_df.if_data; 20030f712c9SDave Chinner return !sfp->count; 20130f712c9SDave Chinner } 20230f712c9SDave Chinner 20330f712c9SDave Chinner /* 20430f712c9SDave Chinner * Validate a given inode number. 20530f712c9SDave Chinner */ 20630f712c9SDave Chinner int 20730f712c9SDave Chinner xfs_dir_ino_validate( 20830f712c9SDave Chinner xfs_mount_t *mp, 20930f712c9SDave Chinner xfs_ino_t ino) 21030f712c9SDave Chinner { 21191fb9afcSDarrick J. Wong bool ino_ok = xfs_verify_dir_ino(mp, ino); 21230f712c9SDave Chinner 213a71895c5SDarrick J. Wong if (XFS_IS_CORRUPT(mp, !ino_ok) || 214a71895c5SDarrick J. Wong XFS_TEST_ERROR(false, mp, XFS_ERRTAG_DIR_INO_VALIDATE)) { 21530f712c9SDave Chinner xfs_warn(mp, "Invalid inode number 0x%Lx", 21630f712c9SDave Chinner (unsigned long long) ino); 2172451337dSDave Chinner return -EFSCORRUPTED; 21830f712c9SDave Chinner } 21930f712c9SDave Chinner return 0; 22030f712c9SDave Chinner } 22130f712c9SDave Chinner 22230f712c9SDave Chinner /* 22330f712c9SDave Chinner * Initialize a directory with its "." and ".." entries. 22430f712c9SDave Chinner */ 22530f712c9SDave Chinner int 22630f712c9SDave Chinner xfs_dir_init( 22730f712c9SDave Chinner xfs_trans_t *tp, 22830f712c9SDave Chinner xfs_inode_t *dp, 22930f712c9SDave Chinner xfs_inode_t *pdp) 23030f712c9SDave Chinner { 23130f712c9SDave Chinner struct xfs_da_args *args; 23230f712c9SDave Chinner int error; 23330f712c9SDave Chinner 234c19b3b05SDave Chinner ASSERT(S_ISDIR(VFS_I(dp)->i_mode)); 23530f712c9SDave Chinner error = xfs_dir_ino_validate(tp->t_mountp, pdp->i_ino); 23630f712c9SDave Chinner if (error) 23730f712c9SDave Chinner return error; 23830f712c9SDave Chinner 239*0b3a76e9SDave Chinner args = kzalloc(sizeof(*args), GFP_KERNEL | __GFP_NOFAIL); 24030f712c9SDave Chinner if (!args) 2412451337dSDave Chinner return -ENOMEM; 24230f712c9SDave Chinner 24330f712c9SDave Chinner args->geo = dp->i_mount->m_dir_geo; 24430f712c9SDave Chinner args->dp = dp; 24530f712c9SDave Chinner args->trans = tp; 24630f712c9SDave Chinner error = xfs_dir2_sf_create(args, pdp->i_ino); 247d4c75a1bSDave Chinner kfree(args); 24830f712c9SDave Chinner return error; 24930f712c9SDave Chinner } 25030f712c9SDave Chinner 25130f712c9SDave Chinner /* 252b16ed7c1SEric Sandeen * Enter a name in a directory, or check for available space. 253b16ed7c1SEric Sandeen * If inum is 0, only the available space test is performed. 25430f712c9SDave Chinner */ 25530f712c9SDave Chinner int 25630f712c9SDave Chinner xfs_dir_createname( 25732a9b7c6SBrian Foster struct xfs_trans *tp, 25832a9b7c6SBrian Foster struct xfs_inode *dp, 259996b2329SDarrick J. Wong const struct xfs_name *name, 26030f712c9SDave Chinner xfs_ino_t inum, /* new entry inode number */ 26130f712c9SDave Chinner xfs_extlen_t total) /* bmap's total block count */ 26230f712c9SDave Chinner { 26330f712c9SDave Chinner struct xfs_da_args *args; 26430f712c9SDave Chinner int rval; 265c098576fSShida Zhang bool v; 26630f712c9SDave Chinner 267c19b3b05SDave Chinner ASSERT(S_ISDIR(VFS_I(dp)->i_mode)); 268c9cfdb38SBrian Foster 269b16ed7c1SEric Sandeen if (inum) { 27030f712c9SDave Chinner rval = xfs_dir_ino_validate(tp->t_mountp, inum); 27130f712c9SDave Chinner if (rval) 27230f712c9SDave Chinner return rval; 273ff6d6af2SBill O'Donnell XFS_STATS_INC(dp->i_mount, xs_dir_create); 274b16ed7c1SEric Sandeen } 27530f712c9SDave Chinner 276*0b3a76e9SDave Chinner args = kzalloc(sizeof(*args), GFP_KERNEL | __GFP_NOFAIL); 27730f712c9SDave Chinner if (!args) 2782451337dSDave Chinner return -ENOMEM; 27930f712c9SDave Chinner 28030f712c9SDave Chinner args->geo = dp->i_mount->m_dir_geo; 28130f712c9SDave Chinner args->name = name->name; 28230f712c9SDave Chinner args->namelen = name->len; 28330f712c9SDave Chinner args->filetype = name->type; 284d8d11fc7SChristoph Hellwig args->hashval = xfs_dir2_hashname(dp->i_mount, name); 28530f712c9SDave Chinner args->inumber = inum; 28630f712c9SDave Chinner args->dp = dp; 28730f712c9SDave Chinner args->total = total; 28830f712c9SDave Chinner args->whichfork = XFS_DATA_FORK; 28930f712c9SDave Chinner args->trans = tp; 29030f712c9SDave Chinner args->op_flags = XFS_DA_OP_ADDNAME | XFS_DA_OP_OKNOENT; 291b16ed7c1SEric Sandeen if (!inum) 292b16ed7c1SEric Sandeen args->op_flags |= XFS_DA_OP_JUSTCHECK; 29330f712c9SDave Chinner 294f7e67b20SChristoph Hellwig if (dp->i_df.if_format == XFS_DINODE_FMT_LOCAL) { 29530f712c9SDave Chinner rval = xfs_dir2_sf_addname(args); 29630f712c9SDave Chinner goto out_free; 29730f712c9SDave Chinner } 29830f712c9SDave Chinner 29930f712c9SDave Chinner rval = xfs_dir2_isblock(args, &v); 30030f712c9SDave Chinner if (rval) 30130f712c9SDave Chinner goto out_free; 30230f712c9SDave Chinner if (v) { 30330f712c9SDave Chinner rval = xfs_dir2_block_addname(args); 30430f712c9SDave Chinner goto out_free; 30530f712c9SDave Chinner } 30630f712c9SDave Chinner 30730f712c9SDave Chinner rval = xfs_dir2_isleaf(args, &v); 30830f712c9SDave Chinner if (rval) 30930f712c9SDave Chinner goto out_free; 31030f712c9SDave Chinner if (v) 31130f712c9SDave Chinner rval = xfs_dir2_leaf_addname(args); 31230f712c9SDave Chinner else 31330f712c9SDave Chinner rval = xfs_dir2_node_addname(args); 31430f712c9SDave Chinner 31530f712c9SDave Chinner out_free: 316d4c75a1bSDave Chinner kfree(args); 31730f712c9SDave Chinner return rval; 31830f712c9SDave Chinner } 31930f712c9SDave Chinner 32030f712c9SDave Chinner /* 32130f712c9SDave Chinner * If doing a CI lookup and case-insensitive match, dup actual name into 32230f712c9SDave Chinner * args.value. Return EEXIST for success (ie. name found) or an error. 32330f712c9SDave Chinner */ 32430f712c9SDave Chinner int 32530f712c9SDave Chinner xfs_dir_cilookup_result( 32630f712c9SDave Chinner struct xfs_da_args *args, 32730f712c9SDave Chinner const unsigned char *name, 32830f712c9SDave Chinner int len) 32930f712c9SDave Chinner { 33030f712c9SDave Chinner if (args->cmpresult == XFS_CMP_DIFFERENT) 3312451337dSDave Chinner return -ENOENT; 33230f712c9SDave Chinner if (args->cmpresult != XFS_CMP_CASE || 33330f712c9SDave Chinner !(args->op_flags & XFS_DA_OP_CILOOKUP)) 3342451337dSDave Chinner return -EEXIST; 33530f712c9SDave Chinner 33694a69db2SDave Chinner args->value = kmalloc(len, 33794a69db2SDave Chinner GFP_KERNEL | __GFP_NOLOCKDEP | __GFP_RETRY_MAYFAIL); 33830f712c9SDave Chinner if (!args->value) 3392451337dSDave Chinner return -ENOMEM; 34030f712c9SDave Chinner 34130f712c9SDave Chinner memcpy(args->value, name, len); 34230f712c9SDave Chinner args->valuelen = len; 3432451337dSDave Chinner return -EEXIST; 34430f712c9SDave Chinner } 34530f712c9SDave Chinner 34630f712c9SDave Chinner /* 34730f712c9SDave Chinner * Lookup a name in a directory, give back the inode number. 34830f712c9SDave Chinner * If ci_name is not NULL, returns the actual name in ci_name if it differs 34930f712c9SDave Chinner * to name, or ci_name->name is set to NULL for an exact match. 35030f712c9SDave Chinner */ 35130f712c9SDave Chinner 35230f712c9SDave Chinner int 35330f712c9SDave Chinner xfs_dir_lookup( 354996b2329SDarrick J. Wong struct xfs_trans *tp, 355996b2329SDarrick J. Wong struct xfs_inode *dp, 356996b2329SDarrick J. Wong const struct xfs_name *name, 35730f712c9SDave Chinner xfs_ino_t *inum, /* out: inode number */ 35830f712c9SDave Chinner struct xfs_name *ci_name) /* out: actual name if CI match */ 35930f712c9SDave Chinner { 36030f712c9SDave Chinner struct xfs_da_args *args; 36130f712c9SDave Chinner int rval; 362c098576fSShida Zhang bool v; 363dbad7c99SDave Chinner int lock_mode; 36430f712c9SDave Chinner 365c19b3b05SDave Chinner ASSERT(S_ISDIR(VFS_I(dp)->i_mode)); 366ff6d6af2SBill O'Donnell XFS_STATS_INC(dp->i_mount, xs_dir_lookup); 36730f712c9SDave Chinner 36894a69db2SDave Chinner args = kzalloc(sizeof(*args), 36994a69db2SDave Chinner GFP_KERNEL | __GFP_NOLOCKDEP | __GFP_NOFAIL); 37030f712c9SDave Chinner args->geo = dp->i_mount->m_dir_geo; 37130f712c9SDave Chinner args->name = name->name; 37230f712c9SDave Chinner args->namelen = name->len; 37330f712c9SDave Chinner args->filetype = name->type; 374d8d11fc7SChristoph Hellwig args->hashval = xfs_dir2_hashname(dp->i_mount, name); 37530f712c9SDave Chinner args->dp = dp; 37630f712c9SDave Chinner args->whichfork = XFS_DATA_FORK; 37730f712c9SDave Chinner args->trans = tp; 37830f712c9SDave Chinner args->op_flags = XFS_DA_OP_OKNOENT; 37930f712c9SDave Chinner if (ci_name) 38030f712c9SDave Chinner args->op_flags |= XFS_DA_OP_CILOOKUP; 38130f712c9SDave Chinner 382dbad7c99SDave Chinner lock_mode = xfs_ilock_data_map_shared(dp); 383f7e67b20SChristoph Hellwig if (dp->i_df.if_format == XFS_DINODE_FMT_LOCAL) { 38430f712c9SDave Chinner rval = xfs_dir2_sf_lookup(args); 38530f712c9SDave Chinner goto out_check_rval; 38630f712c9SDave Chinner } 38730f712c9SDave Chinner 38830f712c9SDave Chinner rval = xfs_dir2_isblock(args, &v); 38930f712c9SDave Chinner if (rval) 39030f712c9SDave Chinner goto out_free; 39130f712c9SDave Chinner if (v) { 39230f712c9SDave Chinner rval = xfs_dir2_block_lookup(args); 39330f712c9SDave Chinner goto out_check_rval; 39430f712c9SDave Chinner } 39530f712c9SDave Chinner 39630f712c9SDave Chinner rval = xfs_dir2_isleaf(args, &v); 39730f712c9SDave Chinner if (rval) 39830f712c9SDave Chinner goto out_free; 39930f712c9SDave Chinner if (v) 40030f712c9SDave Chinner rval = xfs_dir2_leaf_lookup(args); 40130f712c9SDave Chinner else 40230f712c9SDave Chinner rval = xfs_dir2_node_lookup(args); 40330f712c9SDave Chinner 40430f712c9SDave Chinner out_check_rval: 4052451337dSDave Chinner if (rval == -EEXIST) 40630f712c9SDave Chinner rval = 0; 40730f712c9SDave Chinner if (!rval) { 40830f712c9SDave Chinner *inum = args->inumber; 40930f712c9SDave Chinner if (ci_name) { 41030f712c9SDave Chinner ci_name->name = args->value; 41130f712c9SDave Chinner ci_name->len = args->valuelen; 41230f712c9SDave Chinner } 41330f712c9SDave Chinner } 41430f712c9SDave Chinner out_free: 415dbad7c99SDave Chinner xfs_iunlock(dp, lock_mode); 416d4c75a1bSDave Chinner kfree(args); 41730f712c9SDave Chinner return rval; 41830f712c9SDave Chinner } 41930f712c9SDave Chinner 42030f712c9SDave Chinner /* 42130f712c9SDave Chinner * Remove an entry from a directory. 42230f712c9SDave Chinner */ 42330f712c9SDave Chinner int 42430f712c9SDave Chinner xfs_dir_removename( 42532a9b7c6SBrian Foster struct xfs_trans *tp, 42632a9b7c6SBrian Foster struct xfs_inode *dp, 42730f712c9SDave Chinner struct xfs_name *name, 42830f712c9SDave Chinner xfs_ino_t ino, 42930f712c9SDave Chinner xfs_extlen_t total) /* bmap's total block count */ 43030f712c9SDave Chinner { 43130f712c9SDave Chinner struct xfs_da_args *args; 43230f712c9SDave Chinner int rval; 433c098576fSShida Zhang bool v; 43430f712c9SDave Chinner 435c19b3b05SDave Chinner ASSERT(S_ISDIR(VFS_I(dp)->i_mode)); 436ff6d6af2SBill O'Donnell XFS_STATS_INC(dp->i_mount, xs_dir_remove); 43730f712c9SDave Chinner 438*0b3a76e9SDave Chinner args = kzalloc(sizeof(*args), GFP_KERNEL | __GFP_NOFAIL); 43930f712c9SDave Chinner if (!args) 4402451337dSDave Chinner return -ENOMEM; 44130f712c9SDave Chinner 44230f712c9SDave Chinner args->geo = dp->i_mount->m_dir_geo; 44330f712c9SDave Chinner args->name = name->name; 44430f712c9SDave Chinner args->namelen = name->len; 44530f712c9SDave Chinner args->filetype = name->type; 446d8d11fc7SChristoph Hellwig args->hashval = xfs_dir2_hashname(dp->i_mount, name); 44730f712c9SDave Chinner args->inumber = ino; 44830f712c9SDave Chinner args->dp = dp; 44930f712c9SDave Chinner args->total = total; 45030f712c9SDave Chinner args->whichfork = XFS_DATA_FORK; 45130f712c9SDave Chinner args->trans = tp; 45230f712c9SDave Chinner 453f7e67b20SChristoph Hellwig if (dp->i_df.if_format == XFS_DINODE_FMT_LOCAL) { 45430f712c9SDave Chinner rval = xfs_dir2_sf_removename(args); 45530f712c9SDave Chinner goto out_free; 45630f712c9SDave Chinner } 45730f712c9SDave Chinner 45830f712c9SDave Chinner rval = xfs_dir2_isblock(args, &v); 45930f712c9SDave Chinner if (rval) 46030f712c9SDave Chinner goto out_free; 46130f712c9SDave Chinner if (v) { 46230f712c9SDave Chinner rval = xfs_dir2_block_removename(args); 46330f712c9SDave Chinner goto out_free; 46430f712c9SDave Chinner } 46530f712c9SDave Chinner 46630f712c9SDave Chinner rval = xfs_dir2_isleaf(args, &v); 46730f712c9SDave Chinner if (rval) 46830f712c9SDave Chinner goto out_free; 46930f712c9SDave Chinner if (v) 47030f712c9SDave Chinner rval = xfs_dir2_leaf_removename(args); 47130f712c9SDave Chinner else 47230f712c9SDave Chinner rval = xfs_dir2_node_removename(args); 47330f712c9SDave Chinner out_free: 474d4c75a1bSDave Chinner kfree(args); 47530f712c9SDave Chinner return rval; 47630f712c9SDave Chinner } 47730f712c9SDave Chinner 47830f712c9SDave Chinner /* 47930f712c9SDave Chinner * Replace the inode number of a directory entry. 48030f712c9SDave Chinner */ 48130f712c9SDave Chinner int 48230f712c9SDave Chinner xfs_dir_replace( 48332a9b7c6SBrian Foster struct xfs_trans *tp, 48432a9b7c6SBrian Foster struct xfs_inode *dp, 485996b2329SDarrick J. Wong const struct xfs_name *name, /* name of entry to replace */ 48630f712c9SDave Chinner xfs_ino_t inum, /* new inode number */ 48730f712c9SDave Chinner xfs_extlen_t total) /* bmap's total block count */ 48830f712c9SDave Chinner { 48930f712c9SDave Chinner struct xfs_da_args *args; 49030f712c9SDave Chinner int rval; 491c098576fSShida Zhang bool v; 49230f712c9SDave Chinner 493c19b3b05SDave Chinner ASSERT(S_ISDIR(VFS_I(dp)->i_mode)); 49430f712c9SDave Chinner 49530f712c9SDave Chinner rval = xfs_dir_ino_validate(tp->t_mountp, inum); 49630f712c9SDave Chinner if (rval) 49730f712c9SDave Chinner return rval; 49830f712c9SDave Chinner 499*0b3a76e9SDave Chinner args = kzalloc(sizeof(*args), GFP_KERNEL | __GFP_NOFAIL); 50030f712c9SDave Chinner if (!args) 5012451337dSDave Chinner return -ENOMEM; 50230f712c9SDave Chinner 50330f712c9SDave Chinner args->geo = dp->i_mount->m_dir_geo; 50430f712c9SDave Chinner args->name = name->name; 50530f712c9SDave Chinner args->namelen = name->len; 50630f712c9SDave Chinner args->filetype = name->type; 507d8d11fc7SChristoph Hellwig args->hashval = xfs_dir2_hashname(dp->i_mount, name); 50830f712c9SDave Chinner args->inumber = inum; 50930f712c9SDave Chinner args->dp = dp; 51030f712c9SDave Chinner args->total = total; 51130f712c9SDave Chinner args->whichfork = XFS_DATA_FORK; 51230f712c9SDave Chinner args->trans = tp; 51330f712c9SDave Chinner 514f7e67b20SChristoph Hellwig if (dp->i_df.if_format == XFS_DINODE_FMT_LOCAL) { 51530f712c9SDave Chinner rval = xfs_dir2_sf_replace(args); 51630f712c9SDave Chinner goto out_free; 51730f712c9SDave Chinner } 51830f712c9SDave Chinner 51930f712c9SDave Chinner rval = xfs_dir2_isblock(args, &v); 52030f712c9SDave Chinner if (rval) 52130f712c9SDave Chinner goto out_free; 52230f712c9SDave Chinner if (v) { 52330f712c9SDave Chinner rval = xfs_dir2_block_replace(args); 52430f712c9SDave Chinner goto out_free; 52530f712c9SDave Chinner } 52630f712c9SDave Chinner 52730f712c9SDave Chinner rval = xfs_dir2_isleaf(args, &v); 52830f712c9SDave Chinner if (rval) 52930f712c9SDave Chinner goto out_free; 53030f712c9SDave Chinner if (v) 53130f712c9SDave Chinner rval = xfs_dir2_leaf_replace(args); 53230f712c9SDave Chinner else 53330f712c9SDave Chinner rval = xfs_dir2_node_replace(args); 53430f712c9SDave Chinner out_free: 535d4c75a1bSDave Chinner kfree(args); 53630f712c9SDave Chinner return rval; 53730f712c9SDave Chinner } 53830f712c9SDave Chinner 53930f712c9SDave Chinner /* 54030f712c9SDave Chinner * See if this entry can be added to the directory without allocating space. 54130f712c9SDave Chinner */ 54230f712c9SDave Chinner int 54330f712c9SDave Chinner xfs_dir_canenter( 54430f712c9SDave Chinner xfs_trans_t *tp, 54530f712c9SDave Chinner xfs_inode_t *dp, 54694f3cad5SEric Sandeen struct xfs_name *name) /* name of entry to add */ 54730f712c9SDave Chinner { 548381eee69SBrian Foster return xfs_dir_createname(tp, dp, name, 0, 0); 54930f712c9SDave Chinner } 55030f712c9SDave Chinner 55130f712c9SDave Chinner /* 55230f712c9SDave Chinner * Utility routines. 55330f712c9SDave Chinner */ 55430f712c9SDave Chinner 55530f712c9SDave Chinner /* 55630f712c9SDave Chinner * Add a block to the directory. 55730f712c9SDave Chinner * 55830f712c9SDave Chinner * This routine is for data and free blocks, not leaf/node blocks which are 55930f712c9SDave Chinner * handled by xfs_da_grow_inode. 56030f712c9SDave Chinner */ 56130f712c9SDave Chinner int 56230f712c9SDave Chinner xfs_dir2_grow_inode( 56330f712c9SDave Chinner struct xfs_da_args *args, 56430f712c9SDave Chinner int space, /* v2 dir's space XFS_DIR2_xxx_SPACE */ 56530f712c9SDave Chinner xfs_dir2_db_t *dbp) /* out: block number added */ 56630f712c9SDave Chinner { 56730f712c9SDave Chinner struct xfs_inode *dp = args->dp; 56830f712c9SDave Chinner struct xfs_mount *mp = dp->i_mount; 56930f712c9SDave Chinner xfs_fileoff_t bno; /* directory offset of new block */ 57030f712c9SDave Chinner int count; /* count of filesystem blocks */ 57130f712c9SDave Chinner int error; 57230f712c9SDave Chinner 57330f712c9SDave Chinner trace_xfs_dir2_grow_inode(args, space); 57430f712c9SDave Chinner 57530f712c9SDave Chinner /* 57630f712c9SDave Chinner * Set lowest possible block in the space requested. 57730f712c9SDave Chinner */ 57830f712c9SDave Chinner bno = XFS_B_TO_FSBT(mp, space * XFS_DIR2_SPACE_SIZE); 57930f712c9SDave Chinner count = args->geo->fsbcount; 58030f712c9SDave Chinner 58130f712c9SDave Chinner error = xfs_da_grow_inode_int(args, &bno, count); 58230f712c9SDave Chinner if (error) 58330f712c9SDave Chinner return error; 58430f712c9SDave Chinner 58530f712c9SDave Chinner *dbp = xfs_dir2_da_to_db(args->geo, (xfs_dablk_t)bno); 58630f712c9SDave Chinner 58730f712c9SDave Chinner /* 58830f712c9SDave Chinner * Update file's size if this is the data space and it grew. 58930f712c9SDave Chinner */ 59030f712c9SDave Chinner if (space == XFS_DIR2_DATA_SPACE) { 59130f712c9SDave Chinner xfs_fsize_t size; /* directory file (data) size */ 59230f712c9SDave Chinner 59330f712c9SDave Chinner size = XFS_FSB_TO_B(mp, bno + count); 59413d2c10bSChristoph Hellwig if (size > dp->i_disk_size) { 59513d2c10bSChristoph Hellwig dp->i_disk_size = size; 59630f712c9SDave Chinner xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE); 59730f712c9SDave Chinner } 59830f712c9SDave Chinner } 59930f712c9SDave Chinner return 0; 60030f712c9SDave Chinner } 60130f712c9SDave Chinner 60230f712c9SDave Chinner /* 60330f712c9SDave Chinner * See if the directory is a single-block form directory. 60430f712c9SDave Chinner */ 60530f712c9SDave Chinner int 60630f712c9SDave Chinner xfs_dir2_isblock( 60730f712c9SDave Chinner struct xfs_da_args *args, 608c098576fSShida Zhang bool *isblock) 60930f712c9SDave Chinner { 610c098576fSShida Zhang struct xfs_mount *mp = args->dp->i_mount; 611c098576fSShida Zhang xfs_fileoff_t eof; 612c098576fSShida Zhang int error; 61330f712c9SDave Chinner 614c098576fSShida Zhang error = xfs_bmap_last_offset(args->dp, &eof, XFS_DATA_FORK); 615c098576fSShida Zhang if (error) 616c098576fSShida Zhang return error; 617c098576fSShida Zhang 618c098576fSShida Zhang *isblock = false; 619c098576fSShida Zhang if (XFS_FSB_TO_B(mp, eof) != args->geo->blksize) 620c098576fSShida Zhang return 0; 621c098576fSShida Zhang 622c098576fSShida Zhang *isblock = true; 623c098576fSShida Zhang if (XFS_IS_CORRUPT(mp, args->dp->i_disk_size != args->geo->blksize)) 6243c6f46eaSAmir Goldstein return -EFSCORRUPTED; 62530f712c9SDave Chinner return 0; 62630f712c9SDave Chinner } 62730f712c9SDave Chinner 62830f712c9SDave Chinner /* 62930f712c9SDave Chinner * See if the directory is a single-leaf form directory. 63030f712c9SDave Chinner */ 63130f712c9SDave Chinner int 63230f712c9SDave Chinner xfs_dir2_isleaf( 63330f712c9SDave Chinner struct xfs_da_args *args, 634c098576fSShida Zhang bool *isleaf) 63530f712c9SDave Chinner { 636c098576fSShida Zhang xfs_fileoff_t eof; 637c098576fSShida Zhang int error; 63830f712c9SDave Chinner 639c098576fSShida Zhang error = xfs_bmap_last_offset(args->dp, &eof, XFS_DATA_FORK); 640c098576fSShida Zhang if (error) 641c098576fSShida Zhang return error; 642c098576fSShida Zhang 643c098576fSShida Zhang *isleaf = false; 644c098576fSShida Zhang if (eof != args->geo->leafblk + args->geo->fsbcount) 645c098576fSShida Zhang return 0; 646c098576fSShida Zhang 647c098576fSShida Zhang *isleaf = true; 64830f712c9SDave Chinner return 0; 64930f712c9SDave Chinner } 65030f712c9SDave Chinner 65130f712c9SDave Chinner /* 65230f712c9SDave Chinner * Remove the given block from the directory. 65330f712c9SDave Chinner * This routine is used for data and free blocks, leaf/node are done 65430f712c9SDave Chinner * by xfs_da_shrink_inode. 65530f712c9SDave Chinner */ 65630f712c9SDave Chinner int 65730f712c9SDave Chinner xfs_dir2_shrink_inode( 65832a9b7c6SBrian Foster struct xfs_da_args *args, 65930f712c9SDave Chinner xfs_dir2_db_t db, 66030f712c9SDave Chinner struct xfs_buf *bp) 66130f712c9SDave Chinner { 66230f712c9SDave Chinner xfs_fileoff_t bno; /* directory file offset */ 66330f712c9SDave Chinner xfs_dablk_t da; /* directory file offset */ 66430f712c9SDave Chinner int done; /* bunmap is finished */ 66532a9b7c6SBrian Foster struct xfs_inode *dp; 66630f712c9SDave Chinner int error; 66732a9b7c6SBrian Foster struct xfs_mount *mp; 66832a9b7c6SBrian Foster struct xfs_trans *tp; 66930f712c9SDave Chinner 67030f712c9SDave Chinner trace_xfs_dir2_shrink_inode(args, db); 67130f712c9SDave Chinner 67230f712c9SDave Chinner dp = args->dp; 67330f712c9SDave Chinner mp = dp->i_mount; 67430f712c9SDave Chinner tp = args->trans; 67530f712c9SDave Chinner da = xfs_dir2_db_to_da(args->geo, db); 676ab7bb610SDave Chinner 677ab7bb610SDave Chinner /* Unmap the fsblock(s). */ 6782af52842SBrian Foster error = xfs_bunmapi(tp, dp, da, args->geo->fsbcount, 0, 0, &done); 679ab7bb610SDave Chinner if (error) { 68030f712c9SDave Chinner /* 681ab7bb610SDave Chinner * ENOSPC actually can happen if we're in a removename with no 682ab7bb610SDave Chinner * space reservation, and the resulting block removal would 683ab7bb610SDave Chinner * cause a bmap btree split or conversion from extents to btree. 684ab7bb610SDave Chinner * This can only happen for un-fragmented directory blocks, 685ab7bb610SDave Chinner * since you need to be punching out the middle of an extent. 686ab7bb610SDave Chinner * In this case we need to leave the block in the file, and not 687ab7bb610SDave Chinner * binval it. So the block has to be in a consistent empty 688ab7bb610SDave Chinner * state and appropriately logged. We don't free up the buffer, 689ab7bb610SDave Chinner * the caller can tell it hasn't happened since it got an error 690ab7bb610SDave Chinner * back. 69130f712c9SDave Chinner */ 69230f712c9SDave Chinner return error; 69330f712c9SDave Chinner } 69430f712c9SDave Chinner ASSERT(done); 69530f712c9SDave Chinner /* 69630f712c9SDave Chinner * Invalidate the buffer from the transaction. 69730f712c9SDave Chinner */ 69830f712c9SDave Chinner xfs_trans_binval(tp, bp); 69930f712c9SDave Chinner /* 70030f712c9SDave Chinner * If it's not a data block, we're done. 70130f712c9SDave Chinner */ 70230f712c9SDave Chinner if (db >= xfs_dir2_byte_to_db(args->geo, XFS_DIR2_LEAF_OFFSET)) 70330f712c9SDave Chinner return 0; 70430f712c9SDave Chinner /* 70530f712c9SDave Chinner * If the block isn't the last one in the directory, we're done. 70630f712c9SDave Chinner */ 70713d2c10bSChristoph Hellwig if (dp->i_disk_size > xfs_dir2_db_off_to_byte(args->geo, db + 1, 0)) 70830f712c9SDave Chinner return 0; 70930f712c9SDave Chinner bno = da; 71030f712c9SDave Chinner if ((error = xfs_bmap_last_before(tp, dp, &bno, XFS_DATA_FORK))) { 71130f712c9SDave Chinner /* 71230f712c9SDave Chinner * This can't really happen unless there's kernel corruption. 71330f712c9SDave Chinner */ 71430f712c9SDave Chinner return error; 71530f712c9SDave Chinner } 71630f712c9SDave Chinner if (db == args->geo->datablk) 71730f712c9SDave Chinner ASSERT(bno == 0); 71830f712c9SDave Chinner else 71930f712c9SDave Chinner ASSERT(bno > 0); 72030f712c9SDave Chinner /* 72130f712c9SDave Chinner * Set the size to the new last block. 72230f712c9SDave Chinner */ 72313d2c10bSChristoph Hellwig dp->i_disk_size = XFS_FSB_TO_B(mp, bno); 72430f712c9SDave Chinner xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE); 72530f712c9SDave Chinner return 0; 72630f712c9SDave Chinner } 727e5d7d51bSDarrick J. Wong 728e5d7d51bSDarrick J. Wong /* Returns true if the directory entry name is valid. */ 729e5d7d51bSDarrick J. Wong bool 730e5d7d51bSDarrick J. Wong xfs_dir2_namecheck( 731e5d7d51bSDarrick J. Wong const void *name, 732e5d7d51bSDarrick J. Wong size_t length) 733e5d7d51bSDarrick J. Wong { 734e5d7d51bSDarrick J. Wong /* 735e5d7d51bSDarrick J. Wong * MAXNAMELEN includes the trailing null, but (name/length) leave it 736e5d7d51bSDarrick J. Wong * out, so use >= for the length check. 737e5d7d51bSDarrick J. Wong */ 738e5d7d51bSDarrick J. Wong if (length >= MAXNAMELEN) 739e5d7d51bSDarrick J. Wong return false; 740e5d7d51bSDarrick J. Wong 741e5d7d51bSDarrick J. Wong /* There shouldn't be any slashes or nulls here */ 742e5d7d51bSDarrick J. Wong return !memchr(name, '/', length) && !memchr(name, 0, length); 743e5d7d51bSDarrick J. Wong } 744af952aebSDarrick J. Wong 745af952aebSDarrick J. Wong xfs_dahash_t 746af952aebSDarrick J. Wong xfs_dir2_hashname( 747af952aebSDarrick J. Wong struct xfs_mount *mp, 748996b2329SDarrick J. Wong const struct xfs_name *name) 749af952aebSDarrick J. Wong { 750ebd9027dSDave Chinner if (unlikely(xfs_has_asciici(mp))) 751af952aebSDarrick J. Wong return xfs_ascii_ci_hashname(name); 752af952aebSDarrick J. Wong return xfs_da_hashname(name->name, name->len); 753af952aebSDarrick J. Wong } 754af952aebSDarrick J. Wong 755af952aebSDarrick J. Wong enum xfs_dacmp 756af952aebSDarrick J. Wong xfs_dir2_compname( 757af952aebSDarrick J. Wong struct xfs_da_args *args, 758af952aebSDarrick J. Wong const unsigned char *name, 759af952aebSDarrick J. Wong int len) 760af952aebSDarrick J. Wong { 761ebd9027dSDave Chinner if (unlikely(xfs_has_asciici(args->dp->i_mount))) 762af952aebSDarrick J. Wong return xfs_ascii_ci_compname(args, name, len); 763af952aebSDarrick J. Wong return xfs_da_compname(args, name, len); 764af952aebSDarrick J. Wong } 765