/* * Copyright (c) 2000-2001 Silicon Graphics, Inc. All Rights Reserved. * * This program is free software; you can redistribute it and/or modify it * under the terms of version 2 of the GNU General Public License as * published by the Free Software Foundation. * * This program is distributed in the hope that it would be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. * * Further, this software is distributed without any warranty that it is * free of the rightful claim of any third person regarding infringement * or the like. Any license provided herein, whether implied or * otherwise, applies only to this software file. Patent licenses, if * any, provided herein do not apply to combinations of this program with * other software, or any other product whatsoever. * * You should have received a copy of the GNU General Public License along * with this program; if not, write the Free Software Foundation, Inc., 59 * Temple Place - Suite 330, Boston MA 02111-1307, USA. * * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy, * Mountain View, CA 94043, or: * * http://www.sgi.com * * For further information regarding this notice, see: * * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/ */ /* * XFS v2 directory implmentation. * Top-level and utility routines. */ #include "xfs.h" #include "xfs_macros.h" #include "xfs_types.h" #include "xfs_inum.h" #include "xfs_log.h" #include "xfs_trans.h" #include "xfs_sb.h" #include "xfs_ag.h" #include "xfs_dir.h" #include "xfs_dir2.h" #include "xfs_dmapi.h" #include "xfs_mount.h" #include "xfs_alloc_btree.h" #include "xfs_bmap_btree.h" #include "xfs_attr_sf.h" #include "xfs_dir_sf.h" #include "xfs_dir2_sf.h" #include "xfs_dinode.h" #include "xfs_inode_item.h" #include "xfs_inode.h" #include "xfs_bmap.h" #include "xfs_da_btree.h" #include "xfs_dir_leaf.h" #include "xfs_dir2_data.h" #include "xfs_dir2_leaf.h" #include "xfs_dir2_block.h" #include "xfs_dir2_node.h" #include "xfs_dir2_trace.h" #include "xfs_error.h" #include "xfs_bit.h" /* * Declarations for interface routines. */ static void xfs_dir2_mount(xfs_mount_t *mp); static int xfs_dir2_isempty(xfs_inode_t *dp); static int xfs_dir2_init(xfs_trans_t *tp, xfs_inode_t *dp, xfs_inode_t *pdp); static int xfs_dir2_createname(xfs_trans_t *tp, xfs_inode_t *dp, char *name, int namelen, xfs_ino_t inum, xfs_fsblock_t *first, xfs_bmap_free_t *flist, xfs_extlen_t total); static int xfs_dir2_lookup(xfs_trans_t *tp, xfs_inode_t *dp, char *name, int namelen, xfs_ino_t *inum); static int xfs_dir2_removename(xfs_trans_t *tp, xfs_inode_t *dp, char *name, int namelen, xfs_ino_t ino, xfs_fsblock_t *first, xfs_bmap_free_t *flist, xfs_extlen_t total); static int xfs_dir2_getdents(xfs_trans_t *tp, xfs_inode_t *dp, uio_t *uio, int *eofp); static int xfs_dir2_replace(xfs_trans_t *tp, xfs_inode_t *dp, char *name, int namelen, xfs_ino_t inum, xfs_fsblock_t *first, xfs_bmap_free_t *flist, xfs_extlen_t total); static int xfs_dir2_canenter(xfs_trans_t *tp, xfs_inode_t *dp, char *name, int namelen); static int xfs_dir2_shortform_validate_ondisk(xfs_mount_t *mp, xfs_dinode_t *dip); /* * Utility routine declarations. */ static int xfs_dir2_put_dirent64_direct(xfs_dir2_put_args_t *pa); static int xfs_dir2_put_dirent64_uio(xfs_dir2_put_args_t *pa); /* * Directory operations vector. */ xfs_dirops_t xfsv2_dirops = { .xd_mount = xfs_dir2_mount, .xd_isempty = xfs_dir2_isempty, .xd_init = xfs_dir2_init, .xd_createname = xfs_dir2_createname, .xd_lookup = xfs_dir2_lookup, .xd_removename = xfs_dir2_removename, .xd_getdents = xfs_dir2_getdents, .xd_replace = xfs_dir2_replace, .xd_canenter = xfs_dir2_canenter, .xd_shortform_validate_ondisk = xfs_dir2_shortform_validate_ondisk, .xd_shortform_to_single = xfs_dir2_sf_to_block, }; /* * Interface routines. */ /* * Initialize directory-related fields in the mount structure. */ static void xfs_dir2_mount( xfs_mount_t *mp) /* filesystem mount point */ { mp->m_dirversion = 2; ASSERT((1 << (mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog)) <= XFS_MAX_BLOCKSIZE); mp->m_dirblksize = 1 << (mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog); mp->m_dirblkfsbs = 1 << mp->m_sb.sb_dirblklog; mp->m_dirdatablk = XFS_DIR2_DB_TO_DA(mp, XFS_DIR2_DATA_FIRSTDB(mp)); mp->m_dirleafblk = XFS_DIR2_DB_TO_DA(mp, XFS_DIR2_LEAF_FIRSTDB(mp)); mp->m_dirfreeblk = XFS_DIR2_DB_TO_DA(mp, XFS_DIR2_FREE_FIRSTDB(mp)); mp->m_attr_node_ents = (mp->m_sb.sb_blocksize - (uint)sizeof(xfs_da_node_hdr_t)) / (uint)sizeof(xfs_da_node_entry_t); mp->m_dir_node_ents = (mp->m_dirblksize - (uint)sizeof(xfs_da_node_hdr_t)) / (uint)sizeof(xfs_da_node_entry_t); mp->m_dir_magicpct = (mp->m_dirblksize * 37) / 100; } /* * Return 1 if directory contains only "." and "..". */ static int /* return code */ xfs_dir2_isempty( xfs_inode_t *dp) /* incore inode structure */ { xfs_dir2_sf_t *sfp; /* shortform directory structure */ ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR); /* * Might happen during shutdown. */ if (dp->i_d.di_size == 0) { return 1; } if (dp->i_d.di_size > XFS_IFORK_DSIZE(dp)) return 0; sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data; return INT_ISZERO(sfp->hdr.count, ARCH_CONVERT); } /* * Initialize a directory with its "." and ".." entries. */ static int /* error */ xfs_dir2_init( xfs_trans_t *tp, /* transaction pointer */ xfs_inode_t *dp, /* incore directory inode */ xfs_inode_t *pdp) /* incore parent directory inode */ { xfs_da_args_t args; /* operation arguments */ int error; /* error return value */ memset((char *)&args, 0, sizeof(args)); args.dp = dp; args.trans = tp; ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR); if ((error = xfs_dir_ino_validate(tp->t_mountp, pdp->i_ino))) { return error; } return xfs_dir2_sf_create(&args, pdp->i_ino); } /* Enter a name in a directory. */ static int /* error */ xfs_dir2_createname( xfs_trans_t *tp, /* transaction pointer */ xfs_inode_t *dp, /* incore directory inode */ char *name, /* new entry name */ int namelen, /* new entry name length */ xfs_ino_t inum, /* new entry inode number */ xfs_fsblock_t *first, /* bmap's firstblock */ xfs_bmap_free_t *flist, /* bmap's freeblock list */ xfs_extlen_t total) /* bmap's total block count */ { xfs_da_args_t args; /* operation arguments */ int rval; /* return value */ int v; /* type-checking value */ ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR); if ((rval = xfs_dir_ino_validate(tp->t_mountp, inum))) { return rval; } XFS_STATS_INC(xs_dir_create); /* * Fill in the arg structure for this request. */ args.name = name; args.namelen = namelen; args.hashval = xfs_da_hashname(name, namelen); args.inumber = inum; args.dp = dp; args.firstblock = first; args.flist = flist; args.total = total; args.whichfork = XFS_DATA_FORK; args.trans = tp; args.justcheck = 0; args.addname = args.oknoent = 1; /* * Decide on what work routines to call based on the inode size. */ if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) rval = xfs_dir2_sf_addname(&args); else if ((rval = xfs_dir2_isblock(tp, dp, &v))) { return rval; } else if (v) rval = xfs_dir2_block_addname(&args); else if ((rval = xfs_dir2_isleaf(tp, dp, &v))) { return rval; } else if (v) rval = xfs_dir2_leaf_addname(&args); else rval = xfs_dir2_node_addname(&args); return rval; } /* * Lookup a name in a directory, give back the inode number. */ static int /* error */ xfs_dir2_lookup( xfs_trans_t *tp, /* transaction pointer */ xfs_inode_t *dp, /* incore directory inode */ char *name, /* lookup name */ int namelen, /* lookup name length */ xfs_ino_t *inum) /* out: inode number */ { xfs_da_args_t args; /* operation arguments */ int rval; /* return value */ int v; /* type-checking value */ ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR); XFS_STATS_INC(xs_dir_lookup); /* * Fill in the arg structure for this request. */ args.name = name; args.namelen = namelen; args.hashval = xfs_da_hashname(name, namelen); args.inumber = 0; args.dp = dp; args.firstblock = NULL; args.flist = NULL; args.total = 0; args.whichfork = XFS_DATA_FORK; args.trans = tp; args.justcheck = args.addname = 0; args.oknoent = 1; /* * Decide on what work routines to call based on the inode size. */ if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) rval = xfs_dir2_sf_lookup(&args); else if ((rval = xfs_dir2_isblock(tp, dp, &v))) { return rval; } else if (v) rval = xfs_dir2_block_lookup(&args); else if ((rval = xfs_dir2_isleaf(tp, dp, &v))) { return rval; } else if (v) rval = xfs_dir2_leaf_lookup(&args); else rval = xfs_dir2_node_lookup(&args); if (rval == EEXIST) rval = 0; if (rval == 0) *inum = args.inumber; return rval; } /* * Remove an entry from a directory. */ static int /* error */ xfs_dir2_removename( xfs_trans_t *tp, /* transaction pointer */ xfs_inode_t *dp, /* incore directory inode */ char *name, /* name of entry to remove */ int namelen, /* name length of entry to remove */ xfs_ino_t ino, /* inode number of entry to remove */ xfs_fsblock_t *first, /* bmap's firstblock */ xfs_bmap_free_t *flist, /* bmap's freeblock list */ xfs_extlen_t total) /* bmap's total block count */ { xfs_da_args_t args; /* operation arguments */ int rval; /* return value */ int v; /* type-checking value */ ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR); XFS_STATS_INC(xs_dir_remove); /* * Fill in the arg structure for this request. */ args.name = name; args.namelen = namelen; args.hashval = xfs_da_hashname(name, namelen); args.inumber = ino; args.dp = dp; args.firstblock = first; args.flist = flist; args.total = total; args.whichfork = XFS_DATA_FORK; args.trans = tp; args.justcheck = args.addname = args.oknoent = 0; /* * Decide on what work routines to call based on the inode size. */ if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) rval = xfs_dir2_sf_removename(&args); else if ((rval = xfs_dir2_isblock(tp, dp, &v))) { return rval; } else if (v) rval = xfs_dir2_block_removename(&args); else if ((rval = xfs_dir2_isleaf(tp, dp, &v))) { return rval; } else if (v) rval = xfs_dir2_leaf_removename(&args); else rval = xfs_dir2_node_removename(&args); return rval; } /* * Read a directory. */ static int /* error */ xfs_dir2_getdents( xfs_trans_t *tp, /* transaction pointer */ xfs_inode_t *dp, /* incore directory inode */ uio_t *uio, /* caller's buffer control */ int *eofp) /* out: eof reached */ { int alignment; /* alignment required for ABI */ xfs_dirent_t *dbp; /* malloc'ed buffer */ xfs_dir2_put_t put; /* entry formatting routine */ int rval; /* return value */ int v; /* type-checking value */ ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR); XFS_STATS_INC(xs_dir_getdents); /* * If our caller has given us a single contiguous aligned memory buffer, * just work directly within that buffer. If it's in user memory, * lock it down first. */ alignment = sizeof(xfs_off_t) - 1; if ((uio->uio_iovcnt == 1) && (((__psint_t)uio->uio_iov[0].iov_base & alignment) == 0) && ((uio->uio_iov[0].iov_len & alignment) == 0)) { dbp = NULL; put = xfs_dir2_put_dirent64_direct; } else { dbp = kmem_alloc(sizeof(*dbp) + MAXNAMELEN, KM_SLEEP); put = xfs_dir2_put_dirent64_uio; } *eofp = 0; /* * Decide on what work routines to call based on the inode size. */ if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) rval = xfs_dir2_sf_getdents(dp, uio, eofp, dbp, put); else if ((rval = xfs_dir2_isblock(tp, dp, &v))) { ; } else if (v) rval = xfs_dir2_block_getdents(tp, dp, uio, eofp, dbp, put); else rval = xfs_dir2_leaf_getdents(tp, dp, uio, eofp, dbp, put); if (dbp != NULL) kmem_free(dbp, sizeof(*dbp) + MAXNAMELEN); return rval; } /* * Replace the inode number of a directory entry. */ static int /* error */ xfs_dir2_replace( xfs_trans_t *tp, /* transaction pointer */ xfs_inode_t *dp, /* incore directory inode */ char *name, /* name of entry to replace */ int namelen, /* name length of entry to replace */ xfs_ino_t inum, /* new inode number */ xfs_fsblock_t *first, /* bmap's firstblock */ xfs_bmap_free_t *flist, /* bmap's freeblock list */ xfs_extlen_t total) /* bmap's total block count */ { xfs_da_args_t args; /* operation arguments */ int rval; /* return value */ int v; /* type-checking value */ ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR); if ((rval = xfs_dir_ino_validate(tp->t_mountp, inum))) { return rval; } /* * Fill in the arg structure for this request. */ args.name = name; args.namelen = namelen; args.hashval = xfs_da_hashname(name, namelen); args.inumber = inum; args.dp = dp; args.firstblock = first; args.flist = flist; args.total = total; args.whichfork = XFS_DATA_FORK; args.trans = tp; args.justcheck = args.addname = args.oknoent = 0; /* * Decide on what work routines to call based on the inode size. */ if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) rval = xfs_dir2_sf_replace(&args); else if ((rval = xfs_dir2_isblock(tp, dp, &v))) { return rval; } else if (v) rval = xfs_dir2_block_replace(&args); else if ((rval = xfs_dir2_isleaf(tp, dp, &v))) { return rval; } else if (v) rval = xfs_dir2_leaf_replace(&args); else rval = xfs_dir2_node_replace(&args); return rval; } /* * See if this entry can be added to the directory without allocating space. */ static int /* error */ xfs_dir2_canenter( xfs_trans_t *tp, /* transaction pointer */ xfs_inode_t *dp, /* incore directory inode */ char *name, /* name of entry to add */ int namelen) /* name length of entry to add */ { xfs_da_args_t args; /* operation arguments */ int rval; /* return value */ int v; /* type-checking value */ ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR); /* * Fill in the arg structure for this request. */ args.name = name; args.namelen = namelen; args.hashval = xfs_da_hashname(name, namelen); args.inumber = 0; args.dp = dp; args.firstblock = NULL; args.flist = NULL; args.total = 0; args.whichfork = XFS_DATA_FORK; args.trans = tp; args.justcheck = args.addname = args.oknoent = 1; /* * Decide on what work routines to call based on the inode size. */ if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) rval = xfs_dir2_sf_addname(&args); else if ((rval = xfs_dir2_isblock(tp, dp, &v))) { return rval; } else if (v) rval = xfs_dir2_block_addname(&args); else if ((rval = xfs_dir2_isleaf(tp, dp, &v))) { return rval; } else if (v) rval = xfs_dir2_leaf_addname(&args); else rval = xfs_dir2_node_addname(&args); return rval; } /* * Dummy routine for shortform inode validation. * Can't really do this. */ /* ARGSUSED */ static int /* error */ xfs_dir2_shortform_validate_ondisk( xfs_mount_t *mp, /* filesystem mount point */ xfs_dinode_t *dip) /* ondisk inode */ { return 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 /* error */ xfs_dir2_grow_inode( xfs_da_args_t *args, /* operation arguments */ int space, /* v2 dir's space XFS_DIR2_xxx_SPACE */ xfs_dir2_db_t *dbp) /* out: block number added */ { xfs_fileoff_t bno; /* directory offset of new block */ int count; /* count of filesystem blocks */ xfs_inode_t *dp; /* incore directory inode */ int error; /* error return value */ int got; /* blocks actually mapped */ int i; /* temp mapping index */ xfs_bmbt_irec_t map; /* single structure for bmap */ int mapi; /* mapping index */ xfs_bmbt_irec_t *mapp; /* bmap mapping structure(s) */ xfs_mount_t *mp; /* filesystem mount point */ int nmap; /* number of bmap entries */ xfs_trans_t *tp; /* transaction pointer */ xfs_dir2_trace_args_s("grow_inode", args, space); dp = args->dp; tp = args->trans; mp = dp->i_mount; /* * Set lowest possible block in the space requested. */ bno = XFS_B_TO_FSBT(mp, space * XFS_DIR2_SPACE_SIZE); count = mp->m_dirblkfsbs; /* * Find the first hole for our block. */ if ((error = xfs_bmap_first_unused(tp, dp, count, &bno, XFS_DATA_FORK))) { return error; } nmap = 1; ASSERT(args->firstblock != NULL); /* * Try mapping the new block contiguously (one extent). */ if ((error = xfs_bmapi(tp, dp, bno, count, XFS_BMAPI_WRITE|XFS_BMAPI_METADATA|XFS_BMAPI_CONTIG, args->firstblock, args->total, &map, &nmap, args->flist))) { return error; } ASSERT(nmap <= 1); /* * Got it in 1. */ if (nmap == 1) { mapp = ↦ mapi = 1; } /* * Didn't work and this is a multiple-fsb directory block. * Try again with contiguous flag turned on. */ else if (nmap == 0 && count > 1) { xfs_fileoff_t b; /* current file offset */ /* * Space for maximum number of mappings. */ mapp = kmem_alloc(sizeof(*mapp) * count, KM_SLEEP); /* * Iterate until we get to the end of our block. */ for (b = bno, mapi = 0; b < bno + count; ) { int c; /* current fsb count */ /* * Can't map more than MAX_NMAP at once. */ nmap = MIN(XFS_BMAP_MAX_NMAP, count); c = (int)(bno + count - b); if ((error = xfs_bmapi(tp, dp, b, c, XFS_BMAPI_WRITE|XFS_BMAPI_METADATA, args->firstblock, args->total, &mapp[mapi], &nmap, args->flist))) { kmem_free(mapp, sizeof(*mapp) * count); return error; } if (nmap < 1) break; /* * Add this bunch into our table, go to the next offset. */ mapi += nmap; b = mapp[mapi - 1].br_startoff + mapp[mapi - 1].br_blockcount; } } /* * Didn't work. */ else { mapi = 0; mapp = NULL; } /* * See how many fsb's we got. */ for (i = 0, got = 0; i < mapi; i++) got += mapp[i].br_blockcount; /* * Didn't get enough fsb's, or the first/last block's are wrong. */ if (got != count || mapp[0].br_startoff != bno || mapp[mapi - 1].br_startoff + mapp[mapi - 1].br_blockcount != bno + count) { if (mapp != &map) kmem_free(mapp, sizeof(*mapp) * count); return XFS_ERROR(ENOSPC); } /* * Done with the temporary mapping table. */ if (mapp != &map) kmem_free(mapp, sizeof(*mapp) * count); *dbp = XFS_DIR2_DA_TO_DB(mp, (xfs_dablk_t)bno); /* * Update file's size if this is the data space and it grew. */ if (space == XFS_DIR2_DATA_SPACE) { xfs_fsize_t size; /* directory file (data) size */ size = XFS_FSB_TO_B(mp, bno + count); if (size > dp->i_d.di_size) { dp->i_d.di_size = size; xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE); } } return 0; } /* * See if the directory is a single-block form directory. */ int /* error */ xfs_dir2_isblock( xfs_trans_t *tp, /* transaction pointer */ xfs_inode_t *dp, /* incore directory inode */ int *vp) /* out: 1 is block, 0 is not block */ { xfs_fileoff_t last; /* last file offset */ xfs_mount_t *mp; /* filesystem mount point */ int rval; /* return value */ mp = dp->i_mount; if ((rval = xfs_bmap_last_offset(tp, dp, &last, XFS_DATA_FORK))) { return rval; } rval = XFS_FSB_TO_B(mp, last) == mp->m_dirblksize; ASSERT(rval == 0 || dp->i_d.di_size == mp->m_dirblksize); *vp = rval; return 0; } /* * See if the directory is a single-leaf form directory. */ int /* error */ xfs_dir2_isleaf( xfs_trans_t *tp, /* transaction pointer */ xfs_inode_t *dp, /* incore directory inode */ int *vp) /* out: 1 is leaf, 0 is not leaf */ { xfs_fileoff_t last; /* last file offset */ xfs_mount_t *mp; /* filesystem mount point */ int rval; /* return value */ mp = dp->i_mount; if ((rval = xfs_bmap_last_offset(tp, dp, &last, XFS_DATA_FORK))) { return rval; } *vp = last == mp->m_dirleafblk + (1 << mp->m_sb.sb_dirblklog); return 0; } /* * Getdents put routine for 64-bit ABI, direct form. */ static int /* error */ xfs_dir2_put_dirent64_direct( xfs_dir2_put_args_t *pa) /* argument bundle */ { struct dirent *idbp, dtmp; /* dirent pointer */ iovec_t *iovp; /* io vector */ int namelen; /* entry name length */ int reclen; /* entry total length */ uio_t *uio; /* I/O control */ namelen = pa->namelen; dtmp.d_namlen = namelen; dtmp.d_reclen = GENERIC_DIRSIZ(&dtmp); reclen = dtmp.d_reclen; uio = pa->uio; /* * Won't fit in the remaining space. */ if (reclen > uio->uio_resid) { pa->done = 0; return 0; } iovp = uio->uio_iov; idbp = (struct dirent *)iovp->iov_base; iovp->iov_base = (char *)idbp + reclen; iovp->iov_len -= reclen; uio->uio_resid -= reclen; idbp->d_reclen = reclen; idbp->d_fileno = pa->ino; idbp->d_type = DT_UNKNOWN; idbp->d_namlen = namelen; memcpy(idbp->d_name, pa->name, namelen); idbp->d_name[namelen] = '\0'; pa->done = 1; return 0; } /* * Getdents put routine for 64-bit ABI, uio form. */ static int /* error */ xfs_dir2_put_dirent64_uio( xfs_dir2_put_args_t *pa) /* argument bundle */ { struct dirent *idbp, dtmp; /* dirent pointer */ int namelen; /* entry name length */ int reclen; /* entry total length */ int rval; /* return value */ uio_t *uio; /* I/O control */ namelen = pa->namelen; dtmp.d_namlen = namelen; dtmp.d_reclen = GENERIC_DIRSIZ(&dtmp); reclen = dtmp.d_reclen; uio = pa->uio; /* * Won't fit in the remaining space. */ if (reclen > uio->uio_resid) { pa->done = 0; return 0; } idbp = &dtmp; idbp->d_reclen = reclen; idbp->d_fileno = pa->ino; idbp->d_type = DT_UNKNOWN; idbp->d_namlen = namelen; memcpy(idbp->d_name, pa->name, namelen); idbp->d_name[namelen] = '\0'; rval = uio_read((caddr_t)idbp, reclen, uio); pa->done = (rval == 0); return rval; } /* * Remove the given block from the directory. * This routine is used for data and free blocks, leaf/node are done * by xfs_da_shrink_inode. */ int xfs_dir2_shrink_inode( xfs_da_args_t *args, /* operation arguments */ xfs_dir2_db_t db, /* directory block number */ xfs_dabuf_t *bp) /* block's buffer */ { xfs_fileoff_t bno; /* directory file offset */ xfs_dablk_t da; /* directory file offset */ int done; /* bunmap is finished */ xfs_inode_t *dp; /* incore directory inode */ int error; /* error return value */ xfs_mount_t *mp; /* filesystem mount point */ xfs_trans_t *tp; /* transaction pointer */ xfs_dir2_trace_args_db("shrink_inode", args, db, bp); dp = args->dp; mp = dp->i_mount; tp = args->trans; da = XFS_DIR2_DB_TO_DA(mp, db); /* * Unmap the fsblock(s). */ if ((error = xfs_bunmapi(tp, dp, da, mp->m_dirblkfsbs, XFS_BMAPI_METADATA, 0, args->firstblock, args->flist, &done))) { /* * ENOSPC actually can happen if we're in a removename with * no space reservation, and the resulting block removal * would cause a bmap btree split or conversion from extents * to btree. This can only happen for un-fragmented * directory blocks, since you need to be punching out * the middle of an extent. * In this case we need to leave the block in the file, * and not binval it. * So the block has to be in a consistent empty state * and appropriately logged. * We don't free up the buffer, the caller can tell it * hasn't happened since it got an error back. */ return error; } ASSERT(done); /* * Invalidate the buffer from the transaction. */ xfs_da_binval(tp, bp); /* * If it's not a data block, we're done. */ if (db >= XFS_DIR2_LEAF_FIRSTDB(mp)) return 0; /* * If the block isn't the last one in the directory, we're done. */ if (dp->i_d.di_size > XFS_DIR2_DB_OFF_TO_BYTE(mp, db + 1, 0)) return 0; bno = da; if ((error = xfs_bmap_last_before(tp, dp, &bno, XFS_DATA_FORK))) { /* * This can't really happen unless there's kernel corruption. */ return error; } if (db == mp->m_dirdatablk) ASSERT(bno == 0); else ASSERT(bno > 0); /* * Set the size to the new last block. */ dp->i_d.di_size = XFS_FSB_TO_B(mp, bno); xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE); return 0; }