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 2230f712c9SDave Chinner struct xfs_name xfs_name_dotdot = { (unsigned char *)"..", 2, XFS_DIR3_FT_DIR }; 2330f712c9SDave Chinner 241b767ee3SDave Chinner /* 251fc4d33fSAmir Goldstein * Convert inode mode to directory entry filetype 261b767ee3SDave Chinner */ 27a5c46e5eSDarrick J. Wong unsigned char 28a5c46e5eSDarrick J. Wong xfs_mode_to_ftype( 29a5c46e5eSDarrick J. Wong int mode) 301fc4d33fSAmir Goldstein { 311fc4d33fSAmir Goldstein switch (mode & S_IFMT) { 321fc4d33fSAmir Goldstein case S_IFREG: 331fc4d33fSAmir Goldstein return XFS_DIR3_FT_REG_FILE; 341fc4d33fSAmir Goldstein case S_IFDIR: 351fc4d33fSAmir Goldstein return XFS_DIR3_FT_DIR; 361fc4d33fSAmir Goldstein case S_IFCHR: 371fc4d33fSAmir Goldstein return XFS_DIR3_FT_CHRDEV; 381fc4d33fSAmir Goldstein case S_IFBLK: 391fc4d33fSAmir Goldstein return XFS_DIR3_FT_BLKDEV; 401fc4d33fSAmir Goldstein case S_IFIFO: 411fc4d33fSAmir Goldstein return XFS_DIR3_FT_FIFO; 421fc4d33fSAmir Goldstein case S_IFSOCK: 431fc4d33fSAmir Goldstein return XFS_DIR3_FT_SOCK; 441fc4d33fSAmir Goldstein case S_IFLNK: 451fc4d33fSAmir Goldstein return XFS_DIR3_FT_SYMLINK; 461fc4d33fSAmir Goldstein default: 471fc4d33fSAmir Goldstein return XFS_DIR3_FT_UNKNOWN; 481fc4d33fSAmir Goldstein } 491fc4d33fSAmir Goldstein } 5030f712c9SDave Chinner 5130f712c9SDave Chinner /* 5230f712c9SDave Chinner * ASCII case-insensitive (ie. A-Z) support for directories that was 5330f712c9SDave Chinner * used in IRIX. 5430f712c9SDave Chinner */ 5530f712c9SDave Chinner STATIC xfs_dahash_t 5630f712c9SDave Chinner xfs_ascii_ci_hashname( 5730f712c9SDave Chinner struct xfs_name *name) 5830f712c9SDave Chinner { 5930f712c9SDave Chinner xfs_dahash_t hash; 6030f712c9SDave Chinner int i; 6130f712c9SDave Chinner 6230f712c9SDave Chinner for (i = 0, hash = 0; i < name->len; i++) 6330f712c9SDave Chinner hash = tolower(name->name[i]) ^ rol32(hash, 7); 6430f712c9SDave Chinner 6530f712c9SDave Chinner return hash; 6630f712c9SDave Chinner } 6730f712c9SDave Chinner 6830f712c9SDave Chinner STATIC enum xfs_dacmp 6930f712c9SDave Chinner xfs_ascii_ci_compname( 7030f712c9SDave Chinner struct xfs_da_args *args, 7130f712c9SDave Chinner const unsigned char *name, 7230f712c9SDave Chinner int len) 7330f712c9SDave Chinner { 7430f712c9SDave Chinner enum xfs_dacmp result; 7530f712c9SDave Chinner int i; 7630f712c9SDave Chinner 7730f712c9SDave Chinner if (args->namelen != len) 7830f712c9SDave Chinner return XFS_CMP_DIFFERENT; 7930f712c9SDave Chinner 8030f712c9SDave Chinner result = XFS_CMP_EXACT; 8130f712c9SDave Chinner for (i = 0; i < len; i++) { 8230f712c9SDave Chinner if (args->name[i] == name[i]) 8330f712c9SDave Chinner continue; 8430f712c9SDave Chinner if (tolower(args->name[i]) != tolower(name[i])) 8530f712c9SDave Chinner return XFS_CMP_DIFFERENT; 8630f712c9SDave Chinner result = XFS_CMP_CASE; 8730f712c9SDave Chinner } 8830f712c9SDave Chinner 8930f712c9SDave Chinner return result; 9030f712c9SDave Chinner } 9130f712c9SDave Chinner 92cf7841c1SBhumika Goyal static const struct xfs_nameops xfs_ascii_ci_nameops = { 9330f712c9SDave Chinner .hashname = xfs_ascii_ci_hashname, 9430f712c9SDave Chinner .compname = xfs_ascii_ci_compname, 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 10730f712c9SDave Chinner mp->m_dir_geo = kmem_zalloc(sizeof(struct xfs_da_geometry), 108707e0ddaSTetsuo Handa KM_MAYFAIL); 10930f712c9SDave Chinner mp->m_attr_geo = kmem_zalloc(sizeof(struct xfs_da_geometry), 110707e0ddaSTetsuo Handa KM_MAYFAIL); 11130f712c9SDave Chinner if (!mp->m_dir_geo || !mp->m_attr_geo) { 11230f712c9SDave Chinner kmem_free(mp->m_dir_geo); 11330f712c9SDave Chinner kmem_free(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; 123545910bcSChristoph Hellwig if (xfs_sb_version_hascrc(&mp->m_sb)) { 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); 15430f712c9SDave Chinner dageo->magicpct = (dageo->blksize * 37) / 100; 15530f712c9SDave Chinner 15630f712c9SDave Chinner /* set up attribute geometry - single fsb only */ 15730f712c9SDave Chinner dageo = mp->m_attr_geo; 15830f712c9SDave Chinner dageo->blklog = mp->m_sb.sb_blocklog; 15930f712c9SDave Chinner dageo->fsblog = mp->m_sb.sb_blocklog; 16030f712c9SDave Chinner dageo->blksize = 1 << dageo->blklog; 16130f712c9SDave Chinner dageo->fsbcount = 1; 1623b344413SChristoph Hellwig dageo->node_hdr_size = mp->m_dir_geo->node_hdr_size; 1633b344413SChristoph Hellwig dageo->node_ents = (dageo->blksize - dageo->node_hdr_size) / 16430f712c9SDave Chinner (uint)sizeof(xfs_da_node_entry_t); 16530f712c9SDave Chinner dageo->magicpct = (dageo->blksize * 37) / 100; 16630f712c9SDave Chinner 16730f712c9SDave Chinner if (xfs_sb_version_hasasciici(&mp->m_sb)) 16830f712c9SDave Chinner mp->m_dirnameops = &xfs_ascii_ci_nameops; 16930f712c9SDave Chinner else 17030f712c9SDave Chinner mp->m_dirnameops = &xfs_default_nameops; 17130f712c9SDave Chinner 17230f712c9SDave Chinner return 0; 17330f712c9SDave Chinner } 17430f712c9SDave Chinner 17530f712c9SDave Chinner void 17630f712c9SDave Chinner xfs_da_unmount( 17730f712c9SDave Chinner struct xfs_mount *mp) 17830f712c9SDave Chinner { 17930f712c9SDave Chinner kmem_free(mp->m_dir_geo); 18030f712c9SDave Chinner kmem_free(mp->m_attr_geo); 18130f712c9SDave Chinner } 18230f712c9SDave Chinner 18330f712c9SDave Chinner /* 18430f712c9SDave Chinner * Return 1 if directory contains only "." and "..". 18530f712c9SDave Chinner */ 18630f712c9SDave Chinner int 18730f712c9SDave Chinner xfs_dir_isempty( 18830f712c9SDave Chinner xfs_inode_t *dp) 18930f712c9SDave Chinner { 19030f712c9SDave Chinner xfs_dir2_sf_hdr_t *sfp; 19130f712c9SDave Chinner 192c19b3b05SDave Chinner ASSERT(S_ISDIR(VFS_I(dp)->i_mode)); 19330f712c9SDave Chinner if (dp->i_d.di_size == 0) /* might happen during shutdown. */ 19430f712c9SDave Chinner return 1; 19530f712c9SDave Chinner if (dp->i_d.di_size > XFS_IFORK_DSIZE(dp)) 19630f712c9SDave Chinner return 0; 19730f712c9SDave Chinner sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data; 19830f712c9SDave Chinner return !sfp->count; 19930f712c9SDave Chinner } 20030f712c9SDave Chinner 20130f712c9SDave Chinner /* 20230f712c9SDave Chinner * Validate a given inode number. 20330f712c9SDave Chinner */ 20430f712c9SDave Chinner int 20530f712c9SDave Chinner xfs_dir_ino_validate( 20630f712c9SDave Chinner xfs_mount_t *mp, 20730f712c9SDave Chinner xfs_ino_t ino) 20830f712c9SDave Chinner { 20991fb9afcSDarrick J. Wong bool ino_ok = xfs_verify_dir_ino(mp, ino); 21030f712c9SDave Chinner 211*a71895c5SDarrick J. Wong if (XFS_IS_CORRUPT(mp, !ino_ok) || 212*a71895c5SDarrick J. Wong XFS_TEST_ERROR(false, mp, XFS_ERRTAG_DIR_INO_VALIDATE)) { 21330f712c9SDave Chinner xfs_warn(mp, "Invalid inode number 0x%Lx", 21430f712c9SDave Chinner (unsigned long long) ino); 2152451337dSDave Chinner return -EFSCORRUPTED; 21630f712c9SDave Chinner } 21730f712c9SDave Chinner return 0; 21830f712c9SDave Chinner } 21930f712c9SDave Chinner 22030f712c9SDave Chinner /* 22130f712c9SDave Chinner * Initialize a directory with its "." and ".." entries. 22230f712c9SDave Chinner */ 22330f712c9SDave Chinner int 22430f712c9SDave Chinner xfs_dir_init( 22530f712c9SDave Chinner xfs_trans_t *tp, 22630f712c9SDave Chinner xfs_inode_t *dp, 22730f712c9SDave Chinner xfs_inode_t *pdp) 22830f712c9SDave Chinner { 22930f712c9SDave Chinner struct xfs_da_args *args; 23030f712c9SDave Chinner int error; 23130f712c9SDave Chinner 232c19b3b05SDave Chinner ASSERT(S_ISDIR(VFS_I(dp)->i_mode)); 23330f712c9SDave Chinner error = xfs_dir_ino_validate(tp->t_mountp, pdp->i_ino); 23430f712c9SDave Chinner if (error) 23530f712c9SDave Chinner return error; 23630f712c9SDave Chinner 237707e0ddaSTetsuo Handa args = kmem_zalloc(sizeof(*args), KM_NOFS); 23830f712c9SDave Chinner if (!args) 2392451337dSDave Chinner return -ENOMEM; 24030f712c9SDave Chinner 24130f712c9SDave Chinner args->geo = dp->i_mount->m_dir_geo; 24230f712c9SDave Chinner args->dp = dp; 24330f712c9SDave Chinner args->trans = tp; 24430f712c9SDave Chinner error = xfs_dir2_sf_create(args, pdp->i_ino); 24530f712c9SDave Chinner kmem_free(args); 24630f712c9SDave Chinner return error; 24730f712c9SDave Chinner } 24830f712c9SDave Chinner 24930f712c9SDave Chinner /* 250b16ed7c1SEric Sandeen * Enter a name in a directory, or check for available space. 251b16ed7c1SEric Sandeen * If inum is 0, only the available space test is performed. 25230f712c9SDave Chinner */ 25330f712c9SDave Chinner int 25430f712c9SDave Chinner xfs_dir_createname( 25532a9b7c6SBrian Foster struct xfs_trans *tp, 25632a9b7c6SBrian Foster struct xfs_inode *dp, 25730f712c9SDave Chinner struct xfs_name *name, 25830f712c9SDave Chinner xfs_ino_t inum, /* new entry inode number */ 25930f712c9SDave Chinner xfs_extlen_t total) /* bmap's total block count */ 26030f712c9SDave Chinner { 26130f712c9SDave Chinner struct xfs_da_args *args; 26230f712c9SDave Chinner int rval; 26330f712c9SDave Chinner int v; /* type-checking value */ 26430f712c9SDave Chinner 265c19b3b05SDave Chinner ASSERT(S_ISDIR(VFS_I(dp)->i_mode)); 266c9cfdb38SBrian Foster 267b16ed7c1SEric Sandeen if (inum) { 26830f712c9SDave Chinner rval = xfs_dir_ino_validate(tp->t_mountp, inum); 26930f712c9SDave Chinner if (rval) 27030f712c9SDave Chinner return rval; 271ff6d6af2SBill O'Donnell XFS_STATS_INC(dp->i_mount, xs_dir_create); 272b16ed7c1SEric Sandeen } 27330f712c9SDave Chinner 274707e0ddaSTetsuo Handa args = kmem_zalloc(sizeof(*args), KM_NOFS); 27530f712c9SDave Chinner if (!args) 2762451337dSDave Chinner return -ENOMEM; 27730f712c9SDave Chinner 27830f712c9SDave Chinner args->geo = dp->i_mount->m_dir_geo; 27930f712c9SDave Chinner args->name = name->name; 28030f712c9SDave Chinner args->namelen = name->len; 28130f712c9SDave Chinner args->filetype = name->type; 28230f712c9SDave Chinner args->hashval = dp->i_mount->m_dirnameops->hashname(name); 28330f712c9SDave Chinner args->inumber = inum; 28430f712c9SDave Chinner args->dp = dp; 28530f712c9SDave Chinner args->total = total; 28630f712c9SDave Chinner args->whichfork = XFS_DATA_FORK; 28730f712c9SDave Chinner args->trans = tp; 28830f712c9SDave Chinner args->op_flags = XFS_DA_OP_ADDNAME | XFS_DA_OP_OKNOENT; 289b16ed7c1SEric Sandeen if (!inum) 290b16ed7c1SEric Sandeen args->op_flags |= XFS_DA_OP_JUSTCHECK; 29130f712c9SDave Chinner 29230f712c9SDave Chinner if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) { 29330f712c9SDave Chinner rval = xfs_dir2_sf_addname(args); 29430f712c9SDave Chinner goto out_free; 29530f712c9SDave Chinner } 29630f712c9SDave Chinner 29730f712c9SDave Chinner rval = xfs_dir2_isblock(args, &v); 29830f712c9SDave Chinner if (rval) 29930f712c9SDave Chinner goto out_free; 30030f712c9SDave Chinner if (v) { 30130f712c9SDave Chinner rval = xfs_dir2_block_addname(args); 30230f712c9SDave Chinner goto out_free; 30330f712c9SDave Chinner } 30430f712c9SDave Chinner 30530f712c9SDave Chinner rval = xfs_dir2_isleaf(args, &v); 30630f712c9SDave Chinner if (rval) 30730f712c9SDave Chinner goto out_free; 30830f712c9SDave Chinner if (v) 30930f712c9SDave Chinner rval = xfs_dir2_leaf_addname(args); 31030f712c9SDave Chinner else 31130f712c9SDave Chinner rval = xfs_dir2_node_addname(args); 31230f712c9SDave Chinner 31330f712c9SDave Chinner out_free: 31430f712c9SDave Chinner kmem_free(args); 31530f712c9SDave Chinner return rval; 31630f712c9SDave Chinner } 31730f712c9SDave Chinner 31830f712c9SDave Chinner /* 31930f712c9SDave Chinner * If doing a CI lookup and case-insensitive match, dup actual name into 32030f712c9SDave Chinner * args.value. Return EEXIST for success (ie. name found) or an error. 32130f712c9SDave Chinner */ 32230f712c9SDave Chinner int 32330f712c9SDave Chinner xfs_dir_cilookup_result( 32430f712c9SDave Chinner struct xfs_da_args *args, 32530f712c9SDave Chinner const unsigned char *name, 32630f712c9SDave Chinner int len) 32730f712c9SDave Chinner { 32830f712c9SDave Chinner if (args->cmpresult == XFS_CMP_DIFFERENT) 3292451337dSDave Chinner return -ENOENT; 33030f712c9SDave Chinner if (args->cmpresult != XFS_CMP_CASE || 33130f712c9SDave Chinner !(args->op_flags & XFS_DA_OP_CILOOKUP)) 3322451337dSDave Chinner return -EEXIST; 33330f712c9SDave Chinner 33430f712c9SDave Chinner args->value = kmem_alloc(len, KM_NOFS | KM_MAYFAIL); 33530f712c9SDave Chinner if (!args->value) 3362451337dSDave Chinner return -ENOMEM; 33730f712c9SDave Chinner 33830f712c9SDave Chinner memcpy(args->value, name, len); 33930f712c9SDave Chinner args->valuelen = len; 3402451337dSDave Chinner return -EEXIST; 34130f712c9SDave Chinner } 34230f712c9SDave Chinner 34330f712c9SDave Chinner /* 34430f712c9SDave Chinner * Lookup a name in a directory, give back the inode number. 34530f712c9SDave Chinner * If ci_name is not NULL, returns the actual name in ci_name if it differs 34630f712c9SDave Chinner * to name, or ci_name->name is set to NULL for an exact match. 34730f712c9SDave Chinner */ 34830f712c9SDave Chinner 34930f712c9SDave Chinner int 35030f712c9SDave Chinner xfs_dir_lookup( 35130f712c9SDave Chinner xfs_trans_t *tp, 35230f712c9SDave Chinner xfs_inode_t *dp, 35330f712c9SDave Chinner struct xfs_name *name, 35430f712c9SDave Chinner xfs_ino_t *inum, /* out: inode number */ 35530f712c9SDave Chinner struct xfs_name *ci_name) /* out: actual name if CI match */ 35630f712c9SDave Chinner { 35730f712c9SDave Chinner struct xfs_da_args *args; 35830f712c9SDave Chinner int rval; 35930f712c9SDave Chinner int v; /* type-checking value */ 360dbad7c99SDave Chinner int lock_mode; 36130f712c9SDave Chinner 362c19b3b05SDave Chinner ASSERT(S_ISDIR(VFS_I(dp)->i_mode)); 363ff6d6af2SBill O'Donnell XFS_STATS_INC(dp->i_mount, xs_dir_lookup); 36430f712c9SDave Chinner 36530f712c9SDave Chinner /* 36630f712c9SDave Chinner * We need to use KM_NOFS here so that lockdep will not throw false 36730f712c9SDave Chinner * positive deadlock warnings on a non-transactional lookup path. It is 36830f712c9SDave Chinner * safe to recurse into inode recalim in that case, but lockdep can't 36930f712c9SDave Chinner * easily be taught about it. Hence KM_NOFS avoids having to add more 37030f712c9SDave Chinner * lockdep Doing this avoids having to add a bunch of lockdep class 37130f712c9SDave Chinner * annotations into the reclaim path for the ilock. 37230f712c9SDave Chinner */ 373707e0ddaSTetsuo Handa args = kmem_zalloc(sizeof(*args), KM_NOFS); 37430f712c9SDave Chinner args->geo = dp->i_mount->m_dir_geo; 37530f712c9SDave Chinner args->name = name->name; 37630f712c9SDave Chinner args->namelen = name->len; 37730f712c9SDave Chinner args->filetype = name->type; 37830f712c9SDave Chinner args->hashval = dp->i_mount->m_dirnameops->hashname(name); 37930f712c9SDave Chinner args->dp = dp; 38030f712c9SDave Chinner args->whichfork = XFS_DATA_FORK; 38130f712c9SDave Chinner args->trans = tp; 38230f712c9SDave Chinner args->op_flags = XFS_DA_OP_OKNOENT; 38330f712c9SDave Chinner if (ci_name) 38430f712c9SDave Chinner args->op_flags |= XFS_DA_OP_CILOOKUP; 38530f712c9SDave Chinner 386dbad7c99SDave Chinner lock_mode = xfs_ilock_data_map_shared(dp); 38730f712c9SDave Chinner if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) { 38830f712c9SDave Chinner rval = xfs_dir2_sf_lookup(args); 38930f712c9SDave Chinner goto out_check_rval; 39030f712c9SDave Chinner } 39130f712c9SDave Chinner 39230f712c9SDave Chinner rval = xfs_dir2_isblock(args, &v); 39330f712c9SDave Chinner if (rval) 39430f712c9SDave Chinner goto out_free; 39530f712c9SDave Chinner if (v) { 39630f712c9SDave Chinner rval = xfs_dir2_block_lookup(args); 39730f712c9SDave Chinner goto out_check_rval; 39830f712c9SDave Chinner } 39930f712c9SDave Chinner 40030f712c9SDave Chinner rval = xfs_dir2_isleaf(args, &v); 40130f712c9SDave Chinner if (rval) 40230f712c9SDave Chinner goto out_free; 40330f712c9SDave Chinner if (v) 40430f712c9SDave Chinner rval = xfs_dir2_leaf_lookup(args); 40530f712c9SDave Chinner else 40630f712c9SDave Chinner rval = xfs_dir2_node_lookup(args); 40730f712c9SDave Chinner 40830f712c9SDave Chinner out_check_rval: 4092451337dSDave Chinner if (rval == -EEXIST) 41030f712c9SDave Chinner rval = 0; 41130f712c9SDave Chinner if (!rval) { 41230f712c9SDave Chinner *inum = args->inumber; 41330f712c9SDave Chinner if (ci_name) { 41430f712c9SDave Chinner ci_name->name = args->value; 41530f712c9SDave Chinner ci_name->len = args->valuelen; 41630f712c9SDave Chinner } 41730f712c9SDave Chinner } 41830f712c9SDave Chinner out_free: 419dbad7c99SDave Chinner xfs_iunlock(dp, lock_mode); 42030f712c9SDave Chinner kmem_free(args); 42130f712c9SDave Chinner return rval; 42230f712c9SDave Chinner } 42330f712c9SDave Chinner 42430f712c9SDave Chinner /* 42530f712c9SDave Chinner * Remove an entry from a directory. 42630f712c9SDave Chinner */ 42730f712c9SDave Chinner int 42830f712c9SDave Chinner xfs_dir_removename( 42932a9b7c6SBrian Foster struct xfs_trans *tp, 43032a9b7c6SBrian Foster struct xfs_inode *dp, 43130f712c9SDave Chinner struct xfs_name *name, 43230f712c9SDave Chinner xfs_ino_t ino, 43330f712c9SDave Chinner xfs_extlen_t total) /* bmap's total block count */ 43430f712c9SDave Chinner { 43530f712c9SDave Chinner struct xfs_da_args *args; 43630f712c9SDave Chinner int rval; 43730f712c9SDave Chinner int v; /* type-checking value */ 43830f712c9SDave Chinner 439c19b3b05SDave Chinner ASSERT(S_ISDIR(VFS_I(dp)->i_mode)); 440ff6d6af2SBill O'Donnell XFS_STATS_INC(dp->i_mount, xs_dir_remove); 44130f712c9SDave Chinner 442707e0ddaSTetsuo Handa args = kmem_zalloc(sizeof(*args), KM_NOFS); 44330f712c9SDave Chinner if (!args) 4442451337dSDave Chinner return -ENOMEM; 44530f712c9SDave Chinner 44630f712c9SDave Chinner args->geo = dp->i_mount->m_dir_geo; 44730f712c9SDave Chinner args->name = name->name; 44830f712c9SDave Chinner args->namelen = name->len; 44930f712c9SDave Chinner args->filetype = name->type; 45030f712c9SDave Chinner args->hashval = dp->i_mount->m_dirnameops->hashname(name); 45130f712c9SDave Chinner args->inumber = ino; 45230f712c9SDave Chinner args->dp = dp; 45330f712c9SDave Chinner args->total = total; 45430f712c9SDave Chinner args->whichfork = XFS_DATA_FORK; 45530f712c9SDave Chinner args->trans = tp; 45630f712c9SDave Chinner 45730f712c9SDave Chinner if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) { 45830f712c9SDave Chinner rval = xfs_dir2_sf_removename(args); 45930f712c9SDave Chinner goto out_free; 46030f712c9SDave Chinner } 46130f712c9SDave Chinner 46230f712c9SDave Chinner rval = xfs_dir2_isblock(args, &v); 46330f712c9SDave Chinner if (rval) 46430f712c9SDave Chinner goto out_free; 46530f712c9SDave Chinner if (v) { 46630f712c9SDave Chinner rval = xfs_dir2_block_removename(args); 46730f712c9SDave Chinner goto out_free; 46830f712c9SDave Chinner } 46930f712c9SDave Chinner 47030f712c9SDave Chinner rval = xfs_dir2_isleaf(args, &v); 47130f712c9SDave Chinner if (rval) 47230f712c9SDave Chinner goto out_free; 47330f712c9SDave Chinner if (v) 47430f712c9SDave Chinner rval = xfs_dir2_leaf_removename(args); 47530f712c9SDave Chinner else 47630f712c9SDave Chinner rval = xfs_dir2_node_removename(args); 47730f712c9SDave Chinner out_free: 47830f712c9SDave Chinner kmem_free(args); 47930f712c9SDave Chinner return rval; 48030f712c9SDave Chinner } 48130f712c9SDave Chinner 48230f712c9SDave Chinner /* 48330f712c9SDave Chinner * Replace the inode number of a directory entry. 48430f712c9SDave Chinner */ 48530f712c9SDave Chinner int 48630f712c9SDave Chinner xfs_dir_replace( 48732a9b7c6SBrian Foster struct xfs_trans *tp, 48832a9b7c6SBrian Foster struct xfs_inode *dp, 48930f712c9SDave Chinner struct xfs_name *name, /* name of entry to replace */ 49030f712c9SDave Chinner xfs_ino_t inum, /* new inode number */ 49130f712c9SDave Chinner xfs_extlen_t total) /* bmap's total block count */ 49230f712c9SDave Chinner { 49330f712c9SDave Chinner struct xfs_da_args *args; 49430f712c9SDave Chinner int rval; 49530f712c9SDave Chinner int v; /* type-checking value */ 49630f712c9SDave Chinner 497c19b3b05SDave Chinner ASSERT(S_ISDIR(VFS_I(dp)->i_mode)); 49830f712c9SDave Chinner 49930f712c9SDave Chinner rval = xfs_dir_ino_validate(tp->t_mountp, inum); 50030f712c9SDave Chinner if (rval) 50130f712c9SDave Chinner return rval; 50230f712c9SDave Chinner 503707e0ddaSTetsuo Handa args = kmem_zalloc(sizeof(*args), KM_NOFS); 50430f712c9SDave Chinner if (!args) 5052451337dSDave Chinner return -ENOMEM; 50630f712c9SDave Chinner 50730f712c9SDave Chinner args->geo = dp->i_mount->m_dir_geo; 50830f712c9SDave Chinner args->name = name->name; 50930f712c9SDave Chinner args->namelen = name->len; 51030f712c9SDave Chinner args->filetype = name->type; 51130f712c9SDave Chinner args->hashval = dp->i_mount->m_dirnameops->hashname(name); 51230f712c9SDave Chinner args->inumber = inum; 51330f712c9SDave Chinner args->dp = dp; 51430f712c9SDave Chinner args->total = total; 51530f712c9SDave Chinner args->whichfork = XFS_DATA_FORK; 51630f712c9SDave Chinner args->trans = tp; 51730f712c9SDave Chinner 51830f712c9SDave Chinner if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) { 51930f712c9SDave Chinner rval = xfs_dir2_sf_replace(args); 52030f712c9SDave Chinner goto out_free; 52130f712c9SDave Chinner } 52230f712c9SDave Chinner 52330f712c9SDave Chinner rval = xfs_dir2_isblock(args, &v); 52430f712c9SDave Chinner if (rval) 52530f712c9SDave Chinner goto out_free; 52630f712c9SDave Chinner if (v) { 52730f712c9SDave Chinner rval = xfs_dir2_block_replace(args); 52830f712c9SDave Chinner goto out_free; 52930f712c9SDave Chinner } 53030f712c9SDave Chinner 53130f712c9SDave Chinner rval = xfs_dir2_isleaf(args, &v); 53230f712c9SDave Chinner if (rval) 53330f712c9SDave Chinner goto out_free; 53430f712c9SDave Chinner if (v) 53530f712c9SDave Chinner rval = xfs_dir2_leaf_replace(args); 53630f712c9SDave Chinner else 53730f712c9SDave Chinner rval = xfs_dir2_node_replace(args); 53830f712c9SDave Chinner out_free: 53930f712c9SDave Chinner kmem_free(args); 54030f712c9SDave Chinner return rval; 54130f712c9SDave Chinner } 54230f712c9SDave Chinner 54330f712c9SDave Chinner /* 54430f712c9SDave Chinner * See if this entry can be added to the directory without allocating space. 54530f712c9SDave Chinner */ 54630f712c9SDave Chinner int 54730f712c9SDave Chinner xfs_dir_canenter( 54830f712c9SDave Chinner xfs_trans_t *tp, 54930f712c9SDave Chinner xfs_inode_t *dp, 55094f3cad5SEric Sandeen struct xfs_name *name) /* name of entry to add */ 55130f712c9SDave Chinner { 552381eee69SBrian Foster return xfs_dir_createname(tp, dp, name, 0, 0); 55330f712c9SDave Chinner } 55430f712c9SDave Chinner 55530f712c9SDave Chinner /* 55630f712c9SDave Chinner * Utility routines. 55730f712c9SDave Chinner */ 55830f712c9SDave Chinner 55930f712c9SDave Chinner /* 56030f712c9SDave Chinner * Add a block to the directory. 56130f712c9SDave Chinner * 56230f712c9SDave Chinner * This routine is for data and free blocks, not leaf/node blocks which are 56330f712c9SDave Chinner * handled by xfs_da_grow_inode. 56430f712c9SDave Chinner */ 56530f712c9SDave Chinner int 56630f712c9SDave Chinner xfs_dir2_grow_inode( 56730f712c9SDave Chinner struct xfs_da_args *args, 56830f712c9SDave Chinner int space, /* v2 dir's space XFS_DIR2_xxx_SPACE */ 56930f712c9SDave Chinner xfs_dir2_db_t *dbp) /* out: block number added */ 57030f712c9SDave Chinner { 57130f712c9SDave Chinner struct xfs_inode *dp = args->dp; 57230f712c9SDave Chinner struct xfs_mount *mp = dp->i_mount; 57330f712c9SDave Chinner xfs_fileoff_t bno; /* directory offset of new block */ 57430f712c9SDave Chinner int count; /* count of filesystem blocks */ 57530f712c9SDave Chinner int error; 57630f712c9SDave Chinner 57730f712c9SDave Chinner trace_xfs_dir2_grow_inode(args, space); 57830f712c9SDave Chinner 57930f712c9SDave Chinner /* 58030f712c9SDave Chinner * Set lowest possible block in the space requested. 58130f712c9SDave Chinner */ 58230f712c9SDave Chinner bno = XFS_B_TO_FSBT(mp, space * XFS_DIR2_SPACE_SIZE); 58330f712c9SDave Chinner count = args->geo->fsbcount; 58430f712c9SDave Chinner 58530f712c9SDave Chinner error = xfs_da_grow_inode_int(args, &bno, count); 58630f712c9SDave Chinner if (error) 58730f712c9SDave Chinner return error; 58830f712c9SDave Chinner 58930f712c9SDave Chinner *dbp = xfs_dir2_da_to_db(args->geo, (xfs_dablk_t)bno); 59030f712c9SDave Chinner 59130f712c9SDave Chinner /* 59230f712c9SDave Chinner * Update file's size if this is the data space and it grew. 59330f712c9SDave Chinner */ 59430f712c9SDave Chinner if (space == XFS_DIR2_DATA_SPACE) { 59530f712c9SDave Chinner xfs_fsize_t size; /* directory file (data) size */ 59630f712c9SDave Chinner 59730f712c9SDave Chinner size = XFS_FSB_TO_B(mp, bno + count); 59830f712c9SDave Chinner if (size > dp->i_d.di_size) { 59930f712c9SDave Chinner dp->i_d.di_size = size; 60030f712c9SDave Chinner xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE); 60130f712c9SDave Chinner } 60230f712c9SDave Chinner } 60330f712c9SDave Chinner return 0; 60430f712c9SDave Chinner } 60530f712c9SDave Chinner 60630f712c9SDave Chinner /* 60730f712c9SDave Chinner * See if the directory is a single-block form directory. 60830f712c9SDave Chinner */ 60930f712c9SDave Chinner int 61030f712c9SDave Chinner xfs_dir2_isblock( 61130f712c9SDave Chinner struct xfs_da_args *args, 61230f712c9SDave Chinner int *vp) /* out: 1 is block, 0 is not block */ 61330f712c9SDave Chinner { 61430f712c9SDave Chinner xfs_fileoff_t last; /* last file offset */ 61530f712c9SDave Chinner int rval; 61630f712c9SDave Chinner 61730f712c9SDave Chinner if ((rval = xfs_bmap_last_offset(args->dp, &last, XFS_DATA_FORK))) 61830f712c9SDave Chinner return rval; 61930f712c9SDave Chinner rval = XFS_FSB_TO_B(args->dp->i_mount, last) == args->geo->blksize; 620*a71895c5SDarrick J. Wong if (XFS_IS_CORRUPT(args->dp->i_mount, 621*a71895c5SDarrick J. Wong rval != 0 && 622*a71895c5SDarrick J. Wong args->dp->i_d.di_size != args->geo->blksize)) 6233c6f46eaSAmir Goldstein return -EFSCORRUPTED; 62430f712c9SDave Chinner *vp = rval; 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, 63430f712c9SDave Chinner int *vp) /* out: 1 is block, 0 is not block */ 63530f712c9SDave Chinner { 63630f712c9SDave Chinner xfs_fileoff_t last; /* last file offset */ 63730f712c9SDave Chinner int rval; 63830f712c9SDave Chinner 63930f712c9SDave Chinner if ((rval = xfs_bmap_last_offset(args->dp, &last, XFS_DATA_FORK))) 64030f712c9SDave Chinner return rval; 64130f712c9SDave Chinner *vp = last == args->geo->leafblk + args->geo->fsbcount; 64230f712c9SDave Chinner return 0; 64330f712c9SDave Chinner } 64430f712c9SDave Chinner 64530f712c9SDave Chinner /* 64630f712c9SDave Chinner * Remove the given block from the directory. 64730f712c9SDave Chinner * This routine is used for data and free blocks, leaf/node are done 64830f712c9SDave Chinner * by xfs_da_shrink_inode. 64930f712c9SDave Chinner */ 65030f712c9SDave Chinner int 65130f712c9SDave Chinner xfs_dir2_shrink_inode( 65232a9b7c6SBrian Foster struct xfs_da_args *args, 65330f712c9SDave Chinner xfs_dir2_db_t db, 65430f712c9SDave Chinner struct xfs_buf *bp) 65530f712c9SDave Chinner { 65630f712c9SDave Chinner xfs_fileoff_t bno; /* directory file offset */ 65730f712c9SDave Chinner xfs_dablk_t da; /* directory file offset */ 65830f712c9SDave Chinner int done; /* bunmap is finished */ 65932a9b7c6SBrian Foster struct xfs_inode *dp; 66030f712c9SDave Chinner int error; 66132a9b7c6SBrian Foster struct xfs_mount *mp; 66232a9b7c6SBrian Foster struct xfs_trans *tp; 66330f712c9SDave Chinner 66430f712c9SDave Chinner trace_xfs_dir2_shrink_inode(args, db); 66530f712c9SDave Chinner 66630f712c9SDave Chinner dp = args->dp; 66730f712c9SDave Chinner mp = dp->i_mount; 66830f712c9SDave Chinner tp = args->trans; 66930f712c9SDave Chinner da = xfs_dir2_db_to_da(args->geo, db); 670ab7bb610SDave Chinner 671ab7bb610SDave Chinner /* Unmap the fsblock(s). */ 6722af52842SBrian Foster error = xfs_bunmapi(tp, dp, da, args->geo->fsbcount, 0, 0, &done); 673ab7bb610SDave Chinner if (error) { 67430f712c9SDave Chinner /* 675ab7bb610SDave Chinner * ENOSPC actually can happen if we're in a removename with no 676ab7bb610SDave Chinner * space reservation, and the resulting block removal would 677ab7bb610SDave Chinner * cause a bmap btree split or conversion from extents to btree. 678ab7bb610SDave Chinner * This can only happen for un-fragmented directory blocks, 679ab7bb610SDave Chinner * since you need to be punching out the middle of an extent. 680ab7bb610SDave Chinner * In this case we need to leave the block in the file, and not 681ab7bb610SDave Chinner * binval it. So the block has to be in a consistent empty 682ab7bb610SDave Chinner * state and appropriately logged. We don't free up the buffer, 683ab7bb610SDave Chinner * the caller can tell it hasn't happened since it got an error 684ab7bb610SDave Chinner * back. 68530f712c9SDave Chinner */ 68630f712c9SDave Chinner return error; 68730f712c9SDave Chinner } 68830f712c9SDave Chinner ASSERT(done); 68930f712c9SDave Chinner /* 69030f712c9SDave Chinner * Invalidate the buffer from the transaction. 69130f712c9SDave Chinner */ 69230f712c9SDave Chinner xfs_trans_binval(tp, bp); 69330f712c9SDave Chinner /* 69430f712c9SDave Chinner * If it's not a data block, we're done. 69530f712c9SDave Chinner */ 69630f712c9SDave Chinner if (db >= xfs_dir2_byte_to_db(args->geo, XFS_DIR2_LEAF_OFFSET)) 69730f712c9SDave Chinner return 0; 69830f712c9SDave Chinner /* 69930f712c9SDave Chinner * If the block isn't the last one in the directory, we're done. 70030f712c9SDave Chinner */ 70130f712c9SDave Chinner if (dp->i_d.di_size > xfs_dir2_db_off_to_byte(args->geo, db + 1, 0)) 70230f712c9SDave Chinner return 0; 70330f712c9SDave Chinner bno = da; 70430f712c9SDave Chinner if ((error = xfs_bmap_last_before(tp, dp, &bno, XFS_DATA_FORK))) { 70530f712c9SDave Chinner /* 70630f712c9SDave Chinner * This can't really happen unless there's kernel corruption. 70730f712c9SDave Chinner */ 70830f712c9SDave Chinner return error; 70930f712c9SDave Chinner } 71030f712c9SDave Chinner if (db == args->geo->datablk) 71130f712c9SDave Chinner ASSERT(bno == 0); 71230f712c9SDave Chinner else 71330f712c9SDave Chinner ASSERT(bno > 0); 71430f712c9SDave Chinner /* 71530f712c9SDave Chinner * Set the size to the new last block. 71630f712c9SDave Chinner */ 71730f712c9SDave Chinner dp->i_d.di_size = XFS_FSB_TO_B(mp, bno); 71830f712c9SDave Chinner xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE); 71930f712c9SDave Chinner return 0; 72030f712c9SDave Chinner } 721e5d7d51bSDarrick J. Wong 722e5d7d51bSDarrick J. Wong /* Returns true if the directory entry name is valid. */ 723e5d7d51bSDarrick J. Wong bool 724e5d7d51bSDarrick J. Wong xfs_dir2_namecheck( 725e5d7d51bSDarrick J. Wong const void *name, 726e5d7d51bSDarrick J. Wong size_t length) 727e5d7d51bSDarrick J. Wong { 728e5d7d51bSDarrick J. Wong /* 729e5d7d51bSDarrick J. Wong * MAXNAMELEN includes the trailing null, but (name/length) leave it 730e5d7d51bSDarrick J. Wong * out, so use >= for the length check. 731e5d7d51bSDarrick J. Wong */ 732e5d7d51bSDarrick J. Wong if (length >= MAXNAMELEN) 733e5d7d51bSDarrick J. Wong return false; 734e5d7d51bSDarrick J. Wong 735e5d7d51bSDarrick J. Wong /* There shouldn't be any slashes or nulls here */ 736e5d7d51bSDarrick J. Wong return !memchr(name, '/', length) && !memchr(name, 0, length); 737e5d7d51bSDarrick J. Wong } 738