diff options
Diffstat (limited to 'fs/xfs/xfs_dir_leaf.c')
| -rw-r--r-- | fs/xfs/xfs_dir_leaf.c | 2231 |
1 files changed, 2231 insertions, 0 deletions
diff --git a/fs/xfs/xfs_dir_leaf.c b/fs/xfs/xfs_dir_leaf.c new file mode 100644 index 00000000000..617018d6bbd --- /dev/null +++ b/fs/xfs/xfs_dir_leaf.c @@ -0,0 +1,2231 @@ +/* + * Copyright (c) 2000-2003 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_dir_leaf.c + * + * GROT: figure out how to recover gracefully when bmap returns ENOSPC. + */ + +#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_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_ialloc_btree.h" +#include "xfs_alloc.h" +#include "xfs_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_error.h" + +/* + * xfs_dir_leaf.c + * + * Routines to implement leaf blocks of directories as Btrees of hashed names. + */ + +/*======================================================================== + * Function prototypes for the kernel. + *========================================================================*/ + +/* + * Routines used for growing the Btree. + */ +STATIC void xfs_dir_leaf_add_work(xfs_dabuf_t *leaf_buffer, xfs_da_args_t *args, + int insertion_index, + int freemap_index); +STATIC int xfs_dir_leaf_compact(xfs_trans_t *trans, xfs_dabuf_t *leaf_buffer, + int musthave, int justcheck); +STATIC void xfs_dir_leaf_rebalance(xfs_da_state_t *state, + xfs_da_state_blk_t *blk1, + xfs_da_state_blk_t *blk2); +STATIC int xfs_dir_leaf_figure_balance(xfs_da_state_t *state, + xfs_da_state_blk_t *leaf_blk_1, + xfs_da_state_blk_t *leaf_blk_2, + int *number_entries_in_blk1, + int *number_namebytes_in_blk1); + +/* + * Utility routines. + */ +STATIC void xfs_dir_leaf_moveents(xfs_dir_leafblock_t *src_leaf, + int src_start, + xfs_dir_leafblock_t *dst_leaf, + int dst_start, int move_count, + xfs_mount_t *mp); + + +/*======================================================================== + * External routines when dirsize < XFS_IFORK_DSIZE(dp). + *========================================================================*/ + + +/* + * Validate a given inode number. + */ +int +xfs_dir_ino_validate(xfs_mount_t *mp, xfs_ino_t ino) +{ + xfs_agblock_t agblkno; + xfs_agino_t agino; + xfs_agnumber_t agno; + int ino_ok; + int ioff; + + agno = XFS_INO_TO_AGNO(mp, ino); + agblkno = XFS_INO_TO_AGBNO(mp, ino); + ioff = XFS_INO_TO_OFFSET(mp, ino); + agino = XFS_OFFBNO_TO_AGINO(mp, agblkno, ioff); + ino_ok = + agno < mp->m_sb.sb_agcount && + agblkno < mp->m_sb.sb_agblocks && + agblkno != 0 && + ioff < (1 << mp->m_sb.sb_inopblog) && + XFS_AGINO_TO_INO(mp, agno, agino) == ino; + if (unlikely(XFS_TEST_ERROR(!ino_ok, mp, XFS_ERRTAG_DIR_INO_VALIDATE, + XFS_RANDOM_DIR_INO_VALIDATE))) { + xfs_fs_cmn_err(CE_WARN, mp, "Invalid inode number 0x%Lx", + (unsigned long long) ino); + XFS_ERROR_REPORT("xfs_dir_ino_validate", XFS_ERRLEVEL_LOW, mp); + return XFS_ERROR(EFSCORRUPTED); + } + return 0; +} + +/* + * Create the initial contents of a shortform directory. + */ +int +xfs_dir_shortform_create(xfs_da_args_t *args, xfs_ino_t parent) +{ + xfs_dir_sf_hdr_t *hdr; + xfs_inode_t *dp; + + dp = args->dp; + ASSERT(dp != NULL); + ASSERT(dp->i_d.di_size == 0); + if (dp->i_d.di_format == XFS_DINODE_FMT_EXTENTS) { + dp->i_df.if_flags &= ~XFS_IFEXTENTS; /* just in case */ + dp->i_d.di_format = XFS_DINODE_FMT_LOCAL; + xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE); + dp->i_df.if_flags |= XFS_IFINLINE; + } + ASSERT(dp->i_df.if_flags & XFS_IFINLINE); + ASSERT(dp->i_df.if_bytes == 0); + xfs_idata_realloc(dp, sizeof(*hdr), XFS_DATA_FORK); + hdr = (xfs_dir_sf_hdr_t *)dp->i_df.if_u1.if_data; + XFS_DIR_SF_PUT_DIRINO(&parent, &hdr->parent); + + hdr->count = 0; + dp->i_d.di_size = sizeof(*hdr); + xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA); + return(0); +} + +/* + * Add a name to the shortform directory structure. + * Overflow from the inode has already been checked for. + */ +int +xfs_dir_shortform_addname(xfs_da_args_t *args) +{ + xfs_dir_shortform_t *sf; + xfs_dir_sf_entry_t *sfe; + int i, offset, size; + xfs_inode_t *dp; + + dp = args->dp; + ASSERT(dp->i_df.if_flags & XFS_IFINLINE); + /* + * Catch the case where the conversion from shortform to leaf + * failed part way through. + */ + if (dp->i_d.di_size < sizeof(xfs_dir_sf_hdr_t)) { + ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount)); + return XFS_ERROR(EIO); + } + ASSERT(dp->i_df.if_bytes == dp->i_d.di_size); + ASSERT(dp->i_df.if_u1.if_data != NULL); + sf = (xfs_dir_shortform_t *)dp->i_df.if_u1.if_data; + sfe = &sf->list[0]; + for (i = INT_GET(sf->hdr.count, ARCH_CONVERT)-1; i >= 0; i--) { + if (sfe->namelen == args->namelen && + args->name[0] == sfe->name[0] && + memcmp(args->name, sfe->name, args->namelen) == 0) + return(XFS_ERROR(EEXIST)); + sfe = XFS_DIR_SF_NEXTENTRY(sfe); + } + + offset = (int)((char *)sfe - (char *)sf); + size = XFS_DIR_SF_ENTSIZE_BYNAME(args->namelen); + xfs_idata_realloc(dp, size, XFS_DATA_FORK); + sf = (xfs_dir_shortform_t *)dp->i_df.if_u1.if_data; + sfe = (xfs_dir_sf_entry_t *)((char *)sf + offset); + + XFS_DIR_SF_PUT_DIRINO(&args->inumber, &sfe->inumber); + sfe->namelen = args->namelen; + memcpy(sfe->name, args->name, sfe->namelen); + INT_MOD(sf->hdr.count, ARCH_CONVERT, +1); + + dp->i_d.di_size += size; + xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA); + + return(0); +} + +/* + * Remove a name from the shortform directory structure. + */ +int +xfs_dir_shortform_removename(xfs_da_args_t *args) +{ + xfs_dir_shortform_t *sf; + xfs_dir_sf_entry_t *sfe; + int base, size = 0, i; + xfs_inode_t *dp; + + dp = args->dp; + ASSERT(dp->i_df.if_flags & XFS_IFINLINE); + /* + * Catch the case where the conversion from shortform to leaf + * failed part way through. + */ + if (dp->i_d.di_size < sizeof(xfs_dir_sf_hdr_t)) { + ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount)); + return XFS_ERROR(EIO); + } + ASSERT(dp->i_df.if_bytes == dp->i_d.di_size); + ASSERT(dp->i_df.if_u1.if_data != NULL); + base = sizeof(xfs_dir_sf_hdr_t); + sf = (xfs_dir_shortform_t *)dp->i_df.if_u1.if_data; + sfe = &sf->list[0]; + for (i = INT_GET(sf->hdr.count, ARCH_CONVERT)-1; i >= 0; i--) { + size = XFS_DIR_SF_ENTSIZE_BYENTRY(sfe); + if (sfe->namelen == args->namelen && + sfe->name[0] == args->name[0] && + memcmp(sfe->name, args->name, args->namelen) == 0) + break; + base += size; + sfe = XFS_DIR_SF_NEXTENTRY(sfe); + } + if (i < 0) { + ASSERT(args->oknoent); + return(XFS_ERROR(ENOENT)); + } + + if ((base + size) != dp->i_d.di_size) { + memmove(&((char *)sf)[base], &((char *)sf)[base+size], + dp->i_d.di_size - (base+size)); + } + INT_MOD(sf->hdr.count, ARCH_CONVERT, -1); + + xfs_idata_realloc(dp, -size, XFS_DATA_FORK); + dp->i_d.di_size -= size; + xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA); + + return(0); +} + +/* + * Look up a name in a shortform directory structure. + */ +int +xfs_dir_shortform_lookup(xfs_da_args_t *args) +{ + xfs_dir_shortform_t *sf; + xfs_dir_sf_entry_t *sfe; + int i; + xfs_inode_t *dp; + + dp = args->dp; + ASSERT(dp->i_df.if_flags & XFS_IFINLINE); + /* + * Catch the case where the conversion from shortform to leaf + * failed part way through. + */ + if (dp->i_d.di_size < sizeof(xfs_dir_sf_hdr_t)) { + ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount)); + return XFS_ERROR(EIO); + } + ASSERT(dp->i_df.if_bytes == dp->i_d.di_size); + ASSERT(dp->i_df.if_u1.if_data != NULL); + sf = (xfs_dir_shortform_t *)dp->i_df.if_u1.if_data; + if (args->namelen == 2 && + args->name[0] == '.' && args->name[1] == '.') { + XFS_DIR_SF_GET_DIRINO(&sf->hdr.parent, &args->inumber); + return(XFS_ERROR(EEXIST)); + } + if (args->namelen == 1 && args->name[0] == '.') { + args->inumber = dp->i_ino; + return(XFS_ERROR(EEXIST)); + } + sfe = &sf->list[0]; + for (i = INT_GET(sf->hdr.count, ARCH_CONVERT)-1; i >= 0; i--) { + if (sfe->namelen == args->namelen && + sfe->name[0] == args->name[0] && + memcmp(args->name, sfe->name, args->namelen) == 0) { + XFS_DIR_SF_GET_DIRINO(&sfe->inumber, &args->inumber); + return(XFS_ERROR(EEXIST)); + } + sfe = XFS_DIR_SF_NEXTENTRY(sfe); + } + ASSERT(args->oknoent); + return(XFS_ERROR(ENOENT)); +} + +/* + * Convert from using the shortform to the leaf. + */ +int +xfs_dir_shortform_to_leaf(xfs_da_args_t *iargs) +{ + xfs_inode_t *dp; + xfs_dir_shortform_t *sf; + xfs_dir_sf_entry_t *sfe; + xfs_da_args_t args; + xfs_ino_t inumber; + char *tmpbuffer; + int retval, i, size; + xfs_dablk_t blkno; + xfs_dabuf_t *bp; + + dp = iargs->dp; + /* + * Catch the case where the conversion from shortform to leaf + * failed part way through. + */ + if (dp->i_d.di_size < sizeof(xfs_dir_sf_hdr_t)) { + ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount)); + return XFS_ERROR(EIO); + } + ASSERT(dp->i_df.if_bytes == dp->i_d.di_size); + ASSERT(dp->i_df.if_u1.if_data != NULL); + size = dp->i_df.if_bytes; + tmpbuffer = kmem_alloc(size, KM_SLEEP); + ASSERT(tmpbuffer != NULL); + + memcpy(tmpbuffer, dp->i_df.if_u1.if_data, size); + + sf = (xfs_dir_shortform_t *)tmpbuffer; + XFS_DIR_SF_GET_DIRINO(&sf->hdr.parent, &inumber); + + xfs_idata_realloc(dp, -size, XFS_DATA_FORK); + dp->i_d.di_size = 0; + xfs_trans_log_inode(iargs->trans, dp, XFS_ILOG_CORE); + retval = xfs_da_grow_inode(iargs, &blkno); + if (retval) + goto out; + + ASSERT(blkno == 0); + retval = xfs_dir_leaf_create(iargs, blkno, &bp); + if (retval) + goto out; + xfs_da_buf_done(bp); + + args.name = "."; + args.namelen = 1; + args.hashval = xfs_dir_hash_dot; + args.inumber = dp->i_ino; + args.dp = dp; + args.firstblock = iargs->firstblock; + args.flist = iargs->flist; + args.total = iargs->total; + args.whichfork = XFS_DATA_FORK; + args.trans = iargs->trans; + args.justcheck = 0; + args.addname = args.oknoent = 1; + retval = xfs_dir_leaf_addname(&args); + if (retval) + goto out; + + args.name = ".."; + args.namelen = 2; + args.hashval = xfs_dir_hash_dotdot; + args.inumber = inumber; + retval = xfs_dir_leaf_addname(&args); + if (retval) + goto out; + + sfe = &sf->list[0]; + for (i = 0; i < INT_GET(sf->hdr.count, ARCH_CONVERT); i++) { + args.name = (char *)(sfe->name); + args.namelen = sfe->namelen; + args.hashval = xfs_da_hashname((char *)(sfe->name), + sfe->namelen); + XFS_DIR_SF_GET_DIRINO(&sfe->inumber, &args.inumber); + retval = xfs_dir_leaf_addname(&args); + if (retval) + goto out; + sfe = XFS_DIR_SF_NEXTENTRY(sfe); + } + retval = 0; + +out: + kmem_free(tmpbuffer, size); + return(retval); +} + +STATIC int +xfs_dir_shortform_compare(const void *a, const void *b) +{ + xfs_dir_sf_sort_t *sa, *sb; + + sa = (xfs_dir_sf_sort_t *)a; + sb = (xfs_dir_sf_sort_t *)b; + if (sa->hash < sb->hash) + return -1; + else if (sa->hash > sb->hash) + return 1; + else + return sa->entno - sb->entno; +} + +/* + * Copy out directory entries for getdents(), for shortform directories. + */ +/*ARGSUSED*/ +int +xfs_dir_shortform_getdents(xfs_inode_t *dp, uio_t *uio, int *eofp, + xfs_dirent_t *dbp, xfs_dir_put_t put) +{ + xfs_dir_shortform_t *sf; + xfs_dir_sf_entry_t *sfe; + int retval, i, sbsize, nsbuf, lastresid=0, want_entno; + xfs_mount_t *mp; + xfs_dahash_t cookhash, hash; + xfs_dir_put_args_t p; + xfs_dir_sf_sort_t *sbuf, *sbp; + + mp = dp->i_mount; + sf = (xfs_dir_shortform_t *)dp->i_df.if_u1.if_data; + cookhash = XFS_DA_COOKIE_HASH(mp, uio->uio_offset); + want_entno = XFS_DA_COOKIE_ENTRY(mp, uio->uio_offset); + nsbuf = INT_GET(sf->hdr.count, ARCH_CONVERT) + 2; + sbsize = (nsbuf + 1) * sizeof(*sbuf); + sbp = sbuf = kmem_alloc(sbsize, KM_SLEEP); + + xfs_dir_trace_g_du("sf: start", dp, uio); + + /* + * Collect all the entries into the buffer. + * Entry 0 is . + */ + sbp->entno = 0; + sbp->seqno = 0; + sbp->hash = xfs_dir_hash_dot; + sbp->ino = dp->i_ino; + sbp->name = "."; + sbp->namelen = 1; + sbp++; + + /* + * Entry 1 is .. + */ + sbp->entno = 1; + sbp->seqno = 0; + sbp->hash = xfs_dir_hash_dotdot; + sbp->ino = XFS_GET_DIR_INO8(sf->hdr.parent); + sbp->name = ".."; + sbp->namelen = 2; + sbp++; + + /* + * Scan the directory data for the rest of the entries. + */ + for (i = 0, sfe = &sf->list[0]; + i < INT_GET(sf->hdr.count, ARCH_CONVERT); i++) { + + if (unlikely( + ((char *)sfe < (char *)sf) || + ((char *)sfe >= ((char *)sf + dp->i_df.if_bytes)))) { + xfs_dir_trace_g_du("sf: corrupted", dp, uio); + XFS_CORRUPTION_ERROR("xfs_dir_shortform_getdents", + XFS_ERRLEVEL_LOW, mp, sfe); + kmem_free(sbuf, sbsize); + return XFS_ERROR(EFSCORRUPTED); + } + + sbp->entno = i + 2; + sbp->seqno = 0; + sbp->hash = xfs_da_hashname((char *)sfe->name, sfe->namelen); + sbp->ino = XFS_GET_DIR_INO8(sfe->inumber); + sbp->name = (char *)sfe->name; + sbp->namelen = sfe->namelen; + sfe = XFS_DIR_SF_NEXTENTRY(sfe); + sbp++; + } + + /* + * Sort the entries on hash then entno. + */ + qsort(sbuf, nsbuf, sizeof(*sbuf), xfs_dir_shortform_compare); + /* + * Stuff in last entry. + */ + sbp->entno = nsbuf; + sbp->hash = XFS_DA_MAXHASH; + sbp->seqno = 0; + /* + * Figure out the sequence numbers in case there's a hash duplicate. + */ + for (hash = sbuf->hash, sbp = sbuf + 1; + sbp < &sbuf[nsbuf + 1]; sbp++) { + if (sbp->hash == hash) + sbp->seqno = sbp[-1].seqno + 1; + else + hash = sbp->hash; + } + + /* + * Set up put routine. + */ + p.dbp = dbp; + p.put = put; + p.uio = uio; + + /* + * Find our place. + */ + for (sbp = sbuf; sbp < &sbuf[nsbuf + 1]; sbp++) { + if (sbp->hash > cookhash || + (sbp->hash == cookhash && sbp->seqno >= want_entno)) + break; + } + + /* + * Did we fail to find anything? We stop at the last entry, + * the one we put maxhash into. + */ + if (sbp == &sbuf[nsbuf]) { + kmem_free(sbuf, sbsize); + xfs_dir_trace_g_du("sf: hash beyond end", dp, uio); + uio->uio_offset = XFS_DA_MAKE_COOKIE(mp, 0, 0, XFS_DA_MAXHASH); + *eofp = 1; + return 0; + } + + /* + * Loop putting entries into the user buffer. + */ + while (sbp < &sbuf[nsbuf]) { + /* + * Save the first resid in a run of equal-hashval entries + * so that we can back them out if they don't all fit. + */ + if (sbp->seqno == 0 || sbp == sbuf) + lastresid = uio->uio_resid; + XFS_PUT_COOKIE(p.cook, mp, 0, sbp[1].seqno, sbp[1].hash); + p.ino = sbp->ino; +#if XFS_BIG_INUMS + p.ino += mp->m_inoadd; +#endif + p.name = sbp->name; + p.namelen = sbp->namelen; + retval = p.put(&p); + if (!p.done) { + uio->uio_offset = + XFS_DA_MAKE_COOKIE(mp, 0, 0, sbp->hash); + kmem_free(sbuf, sbsize); + uio->uio_resid = lastresid; + xfs_dir_trace_g_du("sf: E-O-B", dp, uio); + return retval; + } + sbp++; + } + kmem_free(sbuf, sbsize); + uio->uio_offset = p.cook.o; + *eofp = 1; + xfs_dir_trace_g_du("sf: E-O-F", dp, uio); + return 0; +} + +/* + * Look up a name in a shortform directory structure, replace the inode number. + */ +int +xfs_dir_shortform_replace(xfs_da_args_t *args) +{ + xfs_dir_shortform_t *sf; + xfs_dir_sf_entry_t *sfe; + xfs_inode_t *dp; + int i; + + dp = args->dp; + ASSERT(dp->i_df.if_flags & XFS_IFINLINE); + /* + * Catch the case where the conversion from shortform to leaf + * failed part way through. + */ + if (dp->i_d.di_size < sizeof(xfs_dir_sf_hdr_t)) { + ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount)); + return XFS_ERROR(EIO); + } + ASSERT(dp->i_df.if_bytes == dp->i_d.di_size); + ASSERT(dp->i_df.if_u1.if_data != NULL); + sf = (xfs_dir_shortform_t *)dp->i_df.if_u1.if_data; + if (args->namelen == 2 && + args->name[0] == '.' && args->name[1] == '.') { + /* XXX - replace assert? */ + XFS_DIR_SF_PUT_DIRINO(&args->inumber, &sf->hdr.parent); + xfs_trans_log_inode(args->trans, dp, XFS_ILOG_DDATA); + return(0); + } + ASSERT(args->namelen != 1 || args->name[0] != '.'); + sfe = &sf->list[0]; + for (i = INT_GET(sf->hdr.count, ARCH_CONVERT)-1; i >= 0; i--) { + if (sfe->namelen == args->namelen && + sfe->name[0] == args->name[0] && + memcmp(args->name, sfe->name, args->namelen) == 0) { + ASSERT(memcmp((char *)&args->inumber, + (char *)&sfe->inumber, sizeof(xfs_ino_t))); + XFS_DIR_SF_PUT_DIRINO(&args->inumber, &sfe->inumber); + xfs_trans_log_inode(args->trans, dp, XFS_ILOG_DDATA); + return(0); + } + sfe = XFS_DIR_SF_NEXTENTRY(sfe); + } + ASSERT(args->oknoent); + return(XFS_ERROR(ENOENT)); +} + +/* + * Convert a leaf directory to shortform structure + */ +int +xfs_dir_leaf_to_shortform(xfs_da_args_t *iargs) +{ + xfs_dir_leafblock_t *leaf; + xfs_dir_leaf_hdr_t *hdr; + xfs_dir_leaf_entry_t *entry; + xfs_dir_leaf_name_t *namest; + xfs_da_args_t args; + xfs_inode_t *dp; + xfs_ino_t parent; + char *tmpbuffer; + int retval, i; + xfs_dabuf_t *bp; + + dp = iargs->dp; + tmpbuffer = kmem_alloc(XFS_LBSIZE(dp->i_mount), KM_SLEEP); + ASSERT(tmpbuffer != NULL); + + retval = xfs_da_read_buf(iargs->trans, iargs->dp, 0, -1, &bp, + XFS_DATA_FORK); + if (retval) + goto out; + ASSERT(bp != NULL); + memcpy(tmpbuffer, bp->data, XFS_LBSIZE(dp->i_mount)); + leaf = (xfs_dir_leafblock_t *)tmpbuffer; + ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) == XFS_DIR_LEAF_MAGIC); + memset(bp->data, 0, XFS_LBSIZE(dp->i_mount)); + + /* + * Find and special case the parent inode number + */ + hdr = &leaf->hdr; + entry = &leaf->entries[0]; + for (i = INT_GET(hdr->count, ARCH_CONVERT)-1; i >= 0; entry++, i--) { + namest = XFS_DIR_LEAF_NAMESTRUCT(leaf, INT_GET(entry->nameidx, ARCH_CONVERT)); + if ((entry->namelen == 2) && + (namest->name[0] == '.') && + (namest->name[1] == '.')) { + XFS_DIR_SF_GET_DIRINO(&namest->inumber, &parent); + entry->nameidx = 0; + } else if ((entry->namelen == 1) && (namest->name[0] == '.')) { + entry->nameidx = 0; + } + } + retval = xfs_da_shrink_inode(iargs, 0, bp); + if (retval) + goto out; + retval = xfs_dir_shortform_create(iargs, parent); + if (retval) + goto out; + + /* + * Copy the rest of the filenames + */ + entry = &leaf->entries[0]; + args.dp = dp; + args.firstblock = iargs->firstblock; + args.flist = iargs->flist; + args.total = iargs->total; + args.whichfork = XFS_DATA_FORK; + args.trans = iargs->trans; + args.justcheck = 0; + args.addname = args.oknoent = 1; + for (i = 0; i < INT_GET(hdr->count, ARCH_CONVERT); entry++, i++) { + if (!entry->nameidx) + continue; + namest = XFS_DIR_LEAF_NAMESTRUCT(leaf, INT_GET(entry->nameidx, ARCH_CONVERT)); + args.name = (char *)(namest->name); + args.namelen = entry->namelen; + args.hashval = INT_GET(entry->hashval, ARCH_CONVERT); + XFS_DIR_SF_GET_DIRINO(&namest->inumber, &args.inumber); + xfs_dir_shortform_addname(&args); + } + +out: + kmem_free(tmpbuffer, XFS_LBSIZE(dp->i_mount)); + return(retval); +} + +/* + * Convert from using a single leaf to a root node and a leaf. + */ +int +xfs_dir_leaf_to_node(xfs_da_args_t *args) +{ + xfs_dir_leafblock_t *leaf; + xfs_da_intnode_t *node; + xfs_inode_t *dp; + xfs_dabuf_t *bp1, *bp2; + xfs_dablk_t blkno; + int retval; + + dp = args->dp; + retval = xfs_da_grow_inode(args, &blkno); + ASSERT(blkno == 1); + if (retval) + return(retval); + retval = xfs_da_read_buf(args->trans, args->dp, 0, -1, &bp1, + XFS_DATA_FORK); + if (retval) + return(retval); + ASSERT(bp1 != NULL); + retval = xfs_da_get_buf(args->trans, args->dp, 1, -1, &bp2, + XFS_DATA_FORK); + if (retval) { + xfs_da_buf_done(bp1); + return(retval); + } + ASSERT(bp2 != NULL); + memcpy(bp2->data, bp1->data, XFS_LBSIZE(dp->i_mount)); + xfs_da_buf_done(bp1); + xfs_da_log_buf(args->trans, bp2, 0, XFS_LBSIZE(dp->i_mount) - 1); + + /* + * Set up the new root node. + */ + retval = xfs_da_node_create(args, 0, 1, &bp1, XFS_DATA_FORK); + if (retval) { + xfs_da_buf_done(bp2); + return(retval); + } + node = bp1->data; + leaf = bp2->data; + ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) == XFS_DIR_LEAF_MAGIC); + INT_SET(node->btree[0].hashval, ARCH_CONVERT, INT_GET(leaf->entries[ INT_GET(leaf->hdr.count, ARCH_CONVERT)-1 ].hashval, ARCH_CONVERT)); + xfs_da_buf_done(bp2); + INT_SET(node->btree[0].before, ARCH_CONVERT, blkno); + INT_SET(node->hdr.count, ARCH_CONVERT, 1); + xfs_da_log_buf(args->trans, bp1, + XFS_DA_LOGRANGE(node, &node->btree[0], sizeof(node->btree[0]))); + xfs_da_buf_done(bp1); + + return(retval); +} + + +/*======================================================================== + * Routines used for growing the Btree. + *========================================================================*/ + +/* + * Create the initial contents of a leaf directory + * or a leaf in a node directory. + */ +int +xfs_dir_leaf_create(xfs_da_args_t *args, xfs_dablk_t blkno, xfs_dabuf_t **bpp) +{ + xfs_dir_leafblock_t *leaf; + xfs_dir_leaf_hdr_t *hdr; + xfs_inode_t *dp; + xfs_dabuf_t *bp; + int retval; + + dp = args->dp; + ASSERT(dp != NULL); + retval = xfs_da_get_buf(args->trans, dp, blkno, -1, &bp, XFS_DATA_FORK); + if (retval) + return(retval); + ASSERT(bp != NULL); + leaf = bp->data; + memset((char *)leaf, 0, XFS_LBSIZE(dp->i_mount)); + hdr = &leaf->hdr; + INT_SET(hdr->info.magic, ARCH_CONVERT, XFS_DIR_LEAF_MAGIC); + INT_SET(hdr->firstused, ARCH_CONVERT, XFS_LBSIZE(dp->i_mount)); + if (!hdr->firstused) + INT_SET(hdr->firstused, ARCH_CONVERT, XFS_LBSIZE(dp->i_mount) - 1); + INT_SET(hdr->freemap[0].base, ARCH_CONVERT, sizeof(xfs_dir_leaf_hdr_t)); + INT_SET(hdr->freemap[0].size, ARCH_CONVERT, INT_GET(hdr->firstused, ARCH_CONVERT) - INT_GET(hdr->freemap[0].base, ARCH_CONVERT)); + + xfs_da_log_buf(args->trans, bp, 0, XFS_LBSIZE(dp->i_mount) - 1); + + *bpp = bp; + return(0); +} + +/* + * Split the leaf node, rebalance, then add the new entry. + */ +int +xfs_dir_leaf_split(xfs_da_state_t *state, xfs_da_state_blk_t *oldblk, + xfs_da_state_blk_t *newblk) +{ + xfs_dablk_t blkno; + xfs_da_args_t *args; + int error; + + /* + * Allocate space for a new leaf node. + */ + args = state->args; + ASSERT(args != NULL); + ASSERT(oldblk->magic == XFS_DIR_LEAF_MAGIC); + error = xfs_da_grow_inode(args, &blkno); + if (error) + return(error); + error = xfs_dir_leaf_create(args, blkno, &newblk->bp); + if (error) + return(error); + newblk->blkno = blkno; + newblk->magic = XFS_DIR_LEAF_MAGIC; + + /* + * Rebalance the entries across the two leaves. + */ + xfs_dir_leaf_rebalance(state, oldblk, newblk); + error = xfs_da_blk_link(state, oldblk, newblk); + if (error) + return(error); + + /* + * Insert the new entry in the correct block. + */ + if (state->inleaf) { + error = xfs_dir_leaf_add(oldblk->bp, args, oldblk->index); + } else { + error = xfs_dir_leaf_add(newblk->bp, args, newblk->index); + } + + /* + * Update last hashval in each block since we added the name. + */ + oldblk->hashval = xfs_dir_leaf_lasthash(oldblk->bp, NULL); + newblk->hashval = xfs_dir_leaf_lasthash(newblk->bp, NULL); + return(error); +} + +/* + * Add a name to the leaf directory structure. + * + * Must take into account fragmented leaves and leaves where spacemap has + * lost some freespace information (ie: holes). + */ +int +xfs_dir_leaf_add(xfs_dabuf_t *bp, xfs_da_args_t *args, int index) +{ + xfs_dir_leafblock_t *leaf; + xfs_dir_leaf_hdr_t *hdr; + xfs_dir_leaf_map_t *map; + int tablesize, entsize, sum, i, tmp, error; + + leaf = bp->data; + ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) == XFS_DIR_LEAF_MAGIC); + ASSERT((index >= 0) && (index <= INT_GET(leaf->hdr.count, ARCH_CONVERT))); + hdr = &leaf->hdr; + entsize = XFS_DIR_LEAF_ENTSIZE_BYNAME(args->namelen); + + /* + * Search through freemap for first-fit on new name length. + * (may need to figure in size of entry struct too) + */ + tablesize = (INT_GET(hdr->count, ARCH_CONVERT) + 1) * (uint)sizeof(xfs_dir_leaf_entry_t) + + (uint)sizeof(xfs_dir_leaf_hdr_t); + map = &hdr->freemap[XFS_DIR_LEAF_MAPSIZE-1]; + for (sum = 0, i = XFS_DIR_LEAF_MAPSIZE-1; i >= 0; map--, i--) { + if (tablesize > INT_GET(hdr->firstused, ARCH_CONVERT)) { + sum += INT_GET(map->size, ARCH_CONVERT); + continue; + } + if (!map->size) + continue; /* no space in this map */ + tmp = entsize; + if (INT_GET(map->base, ARCH_CONVERT) < INT_GET(hdr->firstused, ARCH_CONVERT)) + tmp += (uint)sizeof(xfs_dir_leaf_entry_t); + if (INT_GET(map->size, ARCH_CONVERT) >= tmp) { + if (!args->justcheck) + xfs_dir_leaf_add_work(bp, args, index, i); + return(0); + } + sum += INT_GET(map->size, ARCH_CONVERT); + } + + /* + * If there are no holes in the address space of the block, + * and we don't have enough freespace, then compaction will do us + * no good and we should just give up. + */ + if (!hdr->holes && (sum < entsize)) + return(XFS_ERROR(ENOSPC)); + + /* + * Compact the entries to coalesce free space. + * Pass the justcheck flag so the checking pass can return + * an error, without changing anything, if it won't fit. + */ + error = xfs_dir_leaf_compact(args->trans, bp, + args->total == 0 ? + entsize + + (uint)sizeof(xfs_dir_leaf_entry_t) : 0, + args->justcheck); + if (error) + return(error); + /* + * After compaction, the block is guaranteed to have only one + * free region, in freemap[0]. If it is not big enough, give up. + */ + if (INT_GET(hdr->freemap[0].size, ARCH_CONVERT) < + (entsize + (uint)sizeof(xfs_dir_leaf_entry_t))) + return(XFS_ERROR(ENOSPC)); + + if (!args->justcheck) + xfs_dir_leaf_add_work(bp, args, index, 0); + return(0); +} + +/* + * Add a name to a leaf directory structure. + */ +STATIC void +xfs_dir_leaf_add_work(xfs_dabuf_t *bp, xfs_da_args_t *args, int index, + int mapindex) +{ + xfs_dir_leafblock_t *leaf; + xfs_dir_leaf_hdr_t *hdr; + xfs_dir_leaf_entry_t *entry; + xfs_dir_leaf_name_t *namest; + xfs_dir_leaf_map_t *map; + /* REFERENCED */ + xfs_mount_t *mp; + int tmp, i; + + leaf = bp->data; + ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) == XFS_DIR_LEAF_MAGIC); + hdr = &leaf->hdr; + ASSERT((mapindex >= 0) && (mapindex < XFS_DIR_LEAF_MAPSIZE)); + ASSERT((index >= 0) && (index <= INT_GET(hdr->count, ARCH_CONVERT))); + + /* + * Force open some space in the entry array and fill it in. + */ + entry = &leaf->entries[index]; + if (index < INT_GET(hdr->count, ARCH_CONVERT)) { + tmp = INT_GET(hdr->count, ARCH_CONVERT) - index; + tmp *= (uint)sizeof(xfs_dir_leaf_entry_t); + memmove(entry + 1, entry, tmp); + xfs_da_log_buf(args->trans, bp, + XFS_DA_LOGRANGE(leaf, entry, tmp + (uint)sizeof(*entry))); + } + INT_MOD(hdr->count, ARCH_CONVERT, +1); + + /* + * Allocate space for the new string (at the end of the run). + */ + map = &hdr->freemap[mapindex]; + mp = args->trans->t_mountp; + ASSERT(INT_GET(map->base, ARCH_CONVERT) < XFS_LBSIZE(mp)); + ASSERT(INT_GET(map->size, ARCH_CONVERT) >= XFS_DIR_LEAF_ENTSIZE_BYNAME(args->namelen)); + ASSERT(INT_GET(map->size, ARCH_CONVERT) < XFS_LBSIZE(mp)); + INT_MOD(map->size, ARCH_CONVERT, -(XFS_DIR_LEAF_ENTSIZE_BYNAME(args->namelen))); + INT_SET(entry->nameidx, ARCH_CONVERT, INT_GET(map->base, ARCH_CONVERT) + INT_GET(map->size, ARCH_CONVERT)); + INT_SET(entry->hashval, ARCH_CONVERT, args->hashval); + entry->namelen = args->namelen; + xfs_da_log_buf(args->trans, bp, + XFS_DA_LOGRANGE(leaf, entry, sizeof(*entry))); + + /* + * Copy the string and inode number into the new space. + */ + namest = XFS_DIR_LEAF_NAMESTRUCT(leaf, INT_GET(entry->nameidx, ARCH_CONVERT)); + XFS_DIR_SF_PUT_DIRINO(&args->inumber, &namest->inumber); + memcpy(namest->name, args->name, args->namelen); + xfs_da_log_buf(args->trans, bp, + XFS_DA_LOGRANGE(leaf, namest, XFS_DIR_LEAF_ENTSIZE_BYENTRY(entry))); + + /* + * Update the control info for this leaf node + */ + if (INT_GET(entry->nameidx, ARCH_CONVERT) < INT_GET(hdr->firstused, ARCH_CONVERT)) + INT_COPY(hdr->firstused, entry->nameidx, ARCH_CONVERT); + ASSERT(INT_GET(hdr->firstused, ARCH_CONVERT) >= ((INT_GET(hdr->count, ARCH_CONVERT)*sizeof(*entry))+sizeof(*hdr))); + tmp = (INT_GET(hdr->count, ARCH_CONVERT)-1) * (uint)sizeof(xfs_dir_leaf_entry_t) + + (uint)sizeof(xfs_dir_leaf_hdr_t); + map = &hdr->freemap[0]; + for (i = 0; i < XFS_DIR_LEAF_MAPSIZE; map++, i++) { + if (INT_GET(map->base, ARCH_CONVERT) == tmp) { + INT_MOD(map->base, ARCH_CONVERT, (uint)sizeof(xfs_dir_leaf_entry_t)); + INT_MOD(map->size, ARCH_CONVERT, -((uint)sizeof(xfs_dir_leaf_entry_t))); + } + } + INT_MOD(hdr->namebytes, ARCH_CONVERT, args->namelen); + xfs_da_log_buf(args->trans, bp, + XFS_DA_LOGRANGE(leaf, hdr, sizeof(*hdr))); +} + +/* + * Garbage collect a leaf directory block by copying it to a new buffer. + */ +STATIC int +xfs_dir_leaf_compact(xfs_trans_t *trans, xfs_dabuf_t *bp, int musthave, + int justcheck) +{ + xfs_dir_leafblock_t *leaf_s, *leaf_d; + xfs_dir_leaf_hdr_t *hdr_s, *hdr_d; + xfs_mount_t *mp; + char *tmpbuffer; + char *tmpbuffer2=NULL; + int rval; + int lbsize; + + mp = trans->t_mountp; + lbsize = XFS_LBSIZE(mp); + tmpbuffer = kmem_alloc(lbsize, KM_SLEEP); + ASSERT(tmpbuffer != NULL); + memcpy(tmpbuffer, bp->data, lbsize); + + /* + * Make a second copy in case xfs_dir_leaf_moveents() + * below destroys the original. + */ + if (musthave || justcheck) { + tmpbuffer2 = kmem_alloc(lbsize, KM_SLEEP); + memcpy(tmpbuffer2, bp->data, lbsize); + } + memset(bp->data, 0, lbsize); + + /* + * Copy basic information + */ + leaf_s = (xfs_dir_leafblock_t *)tmpbuffer; + leaf_d = bp->data; + hdr_s = &leaf_s->hdr; + hdr_d = &leaf_d->hdr; + hdr_d->info = hdr_s->info; /* struct copy */ + INT_SET(hdr_d->firstused, ARCH_CONVERT, lbsize); + if (!hdr_d->firstused) + INT_SET(hdr_d->firstused, ARCH_CONVERT, lbsize - 1); + hdr_d->namebytes = 0; + hdr_d->count = 0; + hdr_d->holes = 0; + INT_SET(hdr_d->freemap[0].base, ARCH_CONVERT, sizeof(xfs_dir_leaf_hdr_t)); + INT_SET(hdr_d->freemap[0].size, ARCH_CONVERT, INT_GET(hdr_d->firstused, ARCH_CONVERT) - INT_GET(hdr_d->freemap[0].base, ARCH_CONVERT)); + + /* + * Copy all entry's in the same (sorted) order, + * but allocate filenames packed and in sequence. + * This changes the source (leaf_s) as well. + */ + xfs_dir_leaf_moveents(leaf_s, 0, leaf_d, 0, (int)INT_GET(hdr_s->count, ARCH_CONVERT), mp); + + if (musthave && INT_GET(hdr_d->freemap[0].size, ARCH_CONVERT) < musthave) + rval = XFS_ERROR(ENOSPC); + else + rval = 0; + + if (justcheck || rval == ENOSPC) { + ASSERT(tmpbuffer2); + memcpy(bp->data, tmpbuffer2, lbsize); + } else { + xfs_da_log_buf(trans, bp, 0, lbsize - 1); + } + + kmem_free(tmpbuffer, lbsize); + if (musthave || justcheck) + kmem_free(tmpbuffer2, lbsize); + return(rval); +} + +/* + * Redistribute the directory entries between two leaf nodes, + * taking into account the size of the new entry. + * + * NOTE: if new block is empty, then it will get the upper half of old block. + */ +STATIC void +xfs_dir_leaf_rebalance(xfs_da_state_t *state, xfs_da_state_blk_t *blk1, + xfs_da_state_blk_t *blk2) +{ + xfs_da_state_blk_t *tmp_blk; + xfs_dir_leafblock_t *leaf1, *leaf2; + xfs_dir_leaf_hdr_t *hdr1, *hdr2; + int count, totallen, max, space, swap; + + /* + * Set up environment. + */ + ASSERT(blk1->magic == XFS_DIR_LEAF_MAGIC); + ASSERT(blk2->magic == XFS_DIR_LEAF_MAGIC); + leaf1 = blk1->bp->data; + leaf2 = blk2->bp->data; + ASSERT(INT_GET(leaf1->hdr.info.magic, ARCH_CONVERT) == XFS_DIR_LEAF_MAGIC); + ASSERT(INT_GET(leaf2->hdr.info.magic, ARCH_CONVERT) == XFS_DIR_LEAF_MAGIC); + + /* + * Check ordering of blocks, reverse if it makes things simpler. + */ + swap = 0; + if (xfs_dir_leaf_order(blk1->bp, blk2->bp)) { + tmp_blk = blk1; + blk1 = blk2; + blk2 = tmp_blk; + leaf1 = blk1->bp->data; + leaf2 = blk2->bp->data; + swap = 1; + } + hdr1 = &leaf1->hdr; + hdr2 = &leaf2->hdr; + + /* + * Examine entries until we reduce the absolute difference in + * byte usage between the two blocks to a minimum. Then get + * the direction to copy and the number of elements to move. < |