diff options
Diffstat (limited to 'fs/xfs/xfs_dir.c')
| -rw-r--r-- | fs/xfs/xfs_dir.c | 1223 |
1 files changed, 1223 insertions, 0 deletions
diff --git a/fs/xfs/xfs_dir.c b/fs/xfs/xfs_dir.c new file mode 100644 index 000000000000..ba30bc7682f2 --- /dev/null +++ b/fs/xfs/xfs_dir.c @@ -0,0 +1,1223 @@ +/* + * 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/ + */ + +#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.h" +#include "xfs_bmap.h" +#include "xfs_da_btree.h" +#include "xfs_dir_leaf.h" +#include "xfs_error.h" + +/* + * xfs_dir.c + * + * Provide the external interfaces to manage directories. + */ + +/*======================================================================== + * Function prototypes for the kernel. + *========================================================================*/ + +/* + * Functions for the dirops interfaces. + */ +static void xfs_dir_mount(struct xfs_mount *mp); + +static int xfs_dir_isempty(struct xfs_inode *dp); + +static int xfs_dir_init(struct xfs_trans *trans, + struct xfs_inode *dir, + struct xfs_inode *parent_dir); + +static int xfs_dir_createname(struct xfs_trans *trans, + struct xfs_inode *dp, + char *name_string, + int name_len, + xfs_ino_t inode_number, + xfs_fsblock_t *firstblock, + xfs_bmap_free_t *flist, + xfs_extlen_t total); + +static int xfs_dir_lookup(struct xfs_trans *tp, + struct xfs_inode *dp, + char *name_string, + int name_length, + xfs_ino_t *inode_number); + +static int xfs_dir_removename(struct xfs_trans *trans, + struct xfs_inode *dp, + char *name_string, + int name_length, + xfs_ino_t ino, + xfs_fsblock_t *firstblock, + xfs_bmap_free_t *flist, + xfs_extlen_t total); + +static int xfs_dir_getdents(struct xfs_trans *tp, + struct xfs_inode *dp, + struct uio *uiop, + int *eofp); + +static int xfs_dir_replace(struct xfs_trans *tp, + struct xfs_inode *dp, + char *name_string, + int name_length, + xfs_ino_t inode_number, + xfs_fsblock_t *firstblock, + xfs_bmap_free_t *flist, + xfs_extlen_t total); + +static int xfs_dir_canenter(struct xfs_trans *tp, + struct xfs_inode *dp, + char *name_string, + int name_length); + +static int xfs_dir_shortform_validate_ondisk(xfs_mount_t *mp, + xfs_dinode_t *dip); + +xfs_dirops_t xfsv1_dirops = { + .xd_mount = xfs_dir_mount, + .xd_isempty = xfs_dir_isempty, + .xd_init = xfs_dir_init, + .xd_createname = xfs_dir_createname, + .xd_lookup = xfs_dir_lookup, + .xd_removename = xfs_dir_removename, + .xd_getdents = xfs_dir_getdents, + .xd_replace = xfs_dir_replace, + .xd_canenter = xfs_dir_canenter, + .xd_shortform_validate_ondisk = xfs_dir_shortform_validate_ondisk, + .xd_shortform_to_single = xfs_dir_shortform_to_leaf, +}; + +/* + * Internal routines when dirsize == XFS_LBSIZE(mp). + */ +STATIC int xfs_dir_leaf_lookup(xfs_da_args_t *args); +STATIC int xfs_dir_leaf_removename(xfs_da_args_t *args, int *number_entries, + int *total_namebytes); +STATIC int xfs_dir_leaf_getdents(xfs_trans_t *trans, xfs_inode_t *dp, + uio_t *uio, int *eofp, + xfs_dirent_t *dbp, + xfs_dir_put_t put); +STATIC int xfs_dir_leaf_replace(xfs_da_args_t *args); + +/* + * Internal routines when dirsize > XFS_LBSIZE(mp). + */ +STATIC int xfs_dir_node_addname(xfs_da_args_t *args); +STATIC int xfs_dir_node_lookup(xfs_da_args_t *args); +STATIC int xfs_dir_node_removename(xfs_da_args_t *args); +STATIC int xfs_dir_node_getdents(xfs_trans_t *trans, xfs_inode_t *dp, + uio_t *uio, int *eofp, + xfs_dirent_t *dbp, + xfs_dir_put_t put); +STATIC int xfs_dir_node_replace(xfs_da_args_t *args); + +#if defined(XFS_DIR_TRACE) +ktrace_t *xfs_dir_trace_buf; +#endif + + +/*======================================================================== + * Overall external interface routines. + *========================================================================*/ + +xfs_dahash_t xfs_dir_hash_dot, xfs_dir_hash_dotdot; + +/* + * One-time startup routine called from xfs_init(). + */ +void +xfs_dir_startup(void) +{ + xfs_dir_hash_dot = xfs_da_hashname(".", 1); + xfs_dir_hash_dotdot = xfs_da_hashname("..", 2); +} + +/* + * Initialize directory-related fields in the mount structure. + */ +static void +xfs_dir_mount(xfs_mount_t *mp) +{ + uint shortcount, leafcount, count; + + mp->m_dirversion = 1; + shortcount = (mp->m_attroffset - (uint)sizeof(xfs_dir_sf_hdr_t)) / + (uint)sizeof(xfs_dir_sf_entry_t); + leafcount = (XFS_LBSIZE(mp) - (uint)sizeof(xfs_dir_leaf_hdr_t)) / + ((uint)sizeof(xfs_dir_leaf_entry_t) + + (uint)sizeof(xfs_dir_leaf_name_t)); + count = shortcount > leafcount ? shortcount : leafcount; + mp->m_dircook_elog = xfs_da_log2_roundup(count + 1); + ASSERT(mp->m_dircook_elog <= mp->m_sb.sb_blocklog); + mp->m_dir_node_ents = mp->m_attr_node_ents = + (XFS_LBSIZE(mp) - (uint)sizeof(xfs_da_node_hdr_t)) / + (uint)sizeof(xfs_da_node_entry_t); + mp->m_dir_magicpct = (XFS_LBSIZE(mp) * 37) / 100; + mp->m_dirblksize = mp->m_sb.sb_blocksize; + mp->m_dirblkfsbs = 1; +} + +/* + * Return 1 if directory contains only "." and "..". + */ +static int +xfs_dir_isempty(xfs_inode_t *dp) +{ + xfs_dir_sf_hdr_t *hdr; + + ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR); + if (dp->i_d.di_size == 0) + return(1); + if (dp->i_d.di_size > XFS_IFORK_DSIZE(dp)) + return(0); + hdr = (xfs_dir_sf_hdr_t *)dp->i_df.if_u1.if_data; + return(hdr->count == 0); +} + +/* + * Initialize a directory with its "." and ".." entries. + */ +static int +xfs_dir_init(xfs_trans_t *trans, xfs_inode_t *dir, xfs_inode_t *parent_dir) +{ + xfs_da_args_t args; + int error; + + memset((char *)&args, 0, sizeof(args)); + args.dp = dir; + args.trans = trans; + + ASSERT((dir->i_d.di_mode & S_IFMT) == S_IFDIR); + if ((error = xfs_dir_ino_validate(trans->t_mountp, parent_dir->i_ino))) + return error; + + return(xfs_dir_shortform_create(&args, parent_dir->i_ino)); +} + +/* + * Generic handler routine to add a name to a directory. + * Transitions directory from shortform to Btree as necessary. + */ +static int /* error */ +xfs_dir_createname(xfs_trans_t *trans, xfs_inode_t *dp, char *name, + int namelen, xfs_ino_t inum, xfs_fsblock_t *firstblock, + xfs_bmap_free_t *flist, xfs_extlen_t total) +{ + xfs_da_args_t args; + int retval, newsize, done; + + ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR); + + if ((retval = xfs_dir_ino_validate(trans->t_mountp, inum))) + return (retval); + + 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 = firstblock; + args.flist = flist; + args.total = total; + args.whichfork = XFS_DATA_FORK; + args.trans = trans; + args.justcheck = 0; + args.addname = args.oknoent = 1; + + /* + * Decide on what work routines to call based on the inode size. + */ + done = 0; + if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) { + newsize = XFS_DIR_SF_ENTSIZE_BYNAME(args.namelen); + if ((dp->i_d.di_size + newsize) <= XFS_IFORK_DSIZE(dp)) { + retval = xfs_dir_shortform_addname(&args); + done = 1; + } else { + if (total == 0) + return XFS_ERROR(ENOSPC); + retval = xfs_dir_shortform_to_leaf(&args); + done = retval != 0; + } + } + if (!done && xfs_bmap_one_block(dp, XFS_DATA_FORK)) { + retval = xfs_dir_leaf_addname(&args); + done = retval != ENOSPC; + if (!done) { + if (total == 0) + return XFS_ERROR(ENOSPC); + retval = xfs_dir_leaf_to_node(&args); + done = retval != 0; + } + } + if (!done) { + retval = xfs_dir_node_addname(&args); + } + return(retval); +} + +/* + * Generic handler routine to check if a name can be added to a directory, + * without adding any blocks to the directory. + */ +static int /* error */ +xfs_dir_canenter(xfs_trans_t *trans, xfs_inode_t *dp, char *name, int namelen) +{ + xfs_da_args_t args; + int retval, newsize; + + 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 = trans; + 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) { + newsize = XFS_DIR_SF_ENTSIZE_BYNAME(args.namelen); + if ((dp->i_d.di_size + newsize) <= XFS_IFORK_DSIZE(dp)) + retval = 0; + else + retval = XFS_ERROR(ENOSPC); + } else if (xfs_bmap_one_block(dp, XFS_DATA_FORK)) { + retval = xfs_dir_leaf_addname(&args); + } else { + retval = xfs_dir_node_addname(&args); + } + return(retval); +} + +/* + * Generic handler routine to remove a name from a directory. + * Transitions directory from Btree to shortform as necessary. + */ +static int /* error */ +xfs_dir_removename(xfs_trans_t *trans, xfs_inode_t *dp, char *name, + int namelen, xfs_ino_t ino, xfs_fsblock_t *firstblock, + xfs_bmap_free_t *flist, xfs_extlen_t total) +{ + xfs_da_args_t args; + int count, totallen, newsize, retval; + + 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 = firstblock; + args.flist = flist; + args.total = total; + args.whichfork = XFS_DATA_FORK; + args.trans = trans; + 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) { + retval = xfs_dir_shortform_removename(&args); + } else if (xfs_bmap_one_block(dp, XFS_DATA_FORK)) { + retval = xfs_dir_leaf_removename(&args, &count, &totallen); + if (retval == 0) { + newsize = XFS_DIR_SF_ALLFIT(count, totallen); + if (newsize <= XFS_IFORK_DSIZE(dp)) { + retval = xfs_dir_leaf_to_shortform(&args); + } + } + } else { + retval = xfs_dir_node_removename(&args); + } + return(retval); +} + +static int /* error */ +xfs_dir_lookup(xfs_trans_t *trans, xfs_inode_t *dp, char *name, int namelen, + xfs_ino_t *inum) +{ + xfs_da_args_t args; + int retval; + + 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 = trans; + 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) { + retval = xfs_dir_shortform_lookup(&args); + } else if (xfs_bmap_one_block(dp, XFS_DATA_FORK)) { + retval = xfs_dir_leaf_lookup(&args); + } else { + retval = xfs_dir_node_lookup(&args); + } + if (retval == EEXIST) + retval = 0; + *inum = args.inumber; + return(retval); +} + +/* + * Implement readdir. + */ +static int /* error */ +xfs_dir_getdents(xfs_trans_t *trans, xfs_inode_t *dp, uio_t *uio, int *eofp) +{ + xfs_dirent_t *dbp; + int alignment, retval; + xfs_dir_put_t put; + + XFS_STATS_INC(xs_dir_getdents); + ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR); + + /* + * If our caller has given us a single contiguous 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_dir_put_dirent64_direct; + } else { + dbp = kmem_alloc(sizeof(*dbp) + MAXNAMELEN, KM_SLEEP); + put = xfs_dir_put_dirent64_uio; + } + + /* + * Decide on what work routines to call based on the inode size. + */ + *eofp = 0; + + if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) { + retval = xfs_dir_shortform_getdents(dp, uio, eofp, dbp, put); + } else if (xfs_bmap_one_block(dp, XFS_DATA_FORK)) { + retval = xfs_dir_leaf_getdents(trans, dp, uio, eofp, dbp, put); + } else { + retval = xfs_dir_node_getdents(trans, dp, uio, eofp, dbp, put); + } + if (dbp != NULL) + kmem_free(dbp, sizeof(*dbp) + MAXNAMELEN); + + return(retval); +} + +static int /* error */ +xfs_dir_replace(xfs_trans_t *trans, xfs_inode_t *dp, char *name, int namelen, + xfs_ino_t inum, xfs_fsblock_t *firstblock, + xfs_bmap_free_t *flist, xfs_extlen_t total) +{ + xfs_da_args_t args; + int retval; + + ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR); + + if ((retval = xfs_dir_ino_validate(trans->t_mountp, inum))) + return retval; + + /* + * 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 = firstblock; + args.flist = flist; + args.total = total; + args.whichfork = XFS_DATA_FORK; + args.trans = trans; + 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) { + retval = xfs_dir_shortform_replace(&args); + } else if (xfs_bmap_one_block(dp, XFS_DATA_FORK)) { + retval = xfs_dir_leaf_replace(&args); + } else { + retval = xfs_dir_node_replace(&args); + } + + return(retval); +} + +static int +xfs_dir_shortform_validate_ondisk(xfs_mount_t *mp, xfs_dinode_t *dp) +{ + xfs_ino_t ino; + int namelen_sum; + int count; + xfs_dir_shortform_t *sf; + xfs_dir_sf_entry_t *sfe; + int i; + + + + if ((INT_GET(dp->di_core.di_mode, ARCH_CONVERT) & S_IFMT) != S_IFDIR) { + return 0; + } + if (INT_GET(dp->di_core.di_format, ARCH_CONVERT) != XFS_DINODE_FMT_LOCAL) { + return 0; + } + if (INT_GET(dp->di_core.di_size, ARCH_CONVERT) < sizeof(sf->hdr)) { + xfs_fs_cmn_err(CE_WARN, mp, "Invalid shortform size: dp 0x%p", + dp); + return 1; + } + sf = (xfs_dir_shortform_t *)(&dp->di_u.di_dirsf); + ino = XFS_GET_DIR_INO8(sf->hdr.parent); + if (xfs_dir_ino_validate(mp, ino)) + return 1; + + count = sf->hdr.count; + if ((count < 0) || ((count * 10) > XFS_LITINO(mp))) { + xfs_fs_cmn_err(CE_WARN, mp, + "Invalid shortform count: dp 0x%p", dp); + return(1); + } + + if (count == 0) { + return 0; + } + + namelen_sum = 0; + sfe = &sf->list[0]; + for (i = sf->hdr.count - 1; i >= 0; i--) { + ino = XFS_GET_DIR_INO8(sfe->inumber); + xfs_dir_ino_validate(mp, ino); + if (sfe->namelen >= XFS_LITINO(mp)) { + xfs_fs_cmn_err(CE_WARN, mp, + "Invalid shortform namelen: dp 0x%p", dp); + return 1; + } + namelen_sum += sfe->namelen; + sfe = XFS_DIR_SF_NEXTENTRY(sfe); + } + if (namelen_sum >= XFS_LITINO(mp)) { + xfs_fs_cmn_err(CE_WARN, mp, + "Invalid shortform namelen: dp 0x%p", dp); + return 1; + } + + return 0; +} + +/*======================================================================== + * External routines when dirsize == XFS_LBSIZE(dp->i_mount). + *========================================================================*/ + +/* + * Add a name to the leaf directory structure + * This is the external routine. + */ +int +xfs_dir_leaf_addname(xfs_da_args_t *args) +{ + int index, retval; + xfs_dabuf_t *bp; + + retval = xfs_da_read_buf(args->trans, args->dp, 0, -1, &bp, + XFS_DATA_FORK); + if (retval) + return(retval); + ASSERT(bp != NULL); + + retval = xfs_dir_leaf_lookup_int(bp, args, &index); + if (retval == ENOENT) + retval = xfs_dir_leaf_add(bp, args, index); + xfs_da_buf_done(bp); + return(retval); +} + +/* + * Remove a name from the leaf directory structure + * This is the external routine. + */ +STATIC int +xfs_dir_leaf_removename(xfs_da_args_t *args, int *count, int *totallen) +{ + xfs_dir_leafblock_t *leaf; + int index, retval; + xfs_dabuf_t *bp; + + retval = xfs_da_read_buf(args->trans, args->dp, 0, -1, &bp, + XFS_DATA_FORK); + if (retval) + return(retval); + ASSERT(bp != NULL); + leaf = bp->data; + ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) == XFS_DIR_LEAF_MAGIC); + retval = xfs_dir_leaf_lookup_int(bp, args, &index); + if (retval == EEXIST) { + (void)xfs_dir_leaf_remove(args->trans, bp, index); + *count = INT_GET(leaf->hdr.count, ARCH_CONVERT); + *totallen = INT_GET(leaf->hdr.namebytes, ARCH_CONVERT); + retval = 0; + } + xfs_da_buf_done(bp); + return(retval); +} + +/* + * Look up a name in a leaf directory structure. + * This is the external routine. + */ +STATIC int +xfs_dir_leaf_lookup(xfs_da_args_t *args) +{ + int index, retval; + xfs_dabuf_t *bp; + + retval = xfs_da_read_buf(args->trans, args->dp, 0, -1, &bp, + XFS_DATA_FORK); + if (retval) + return(retval); + ASSERT(bp != NULL); + retval = xfs_dir_leaf_lookup_int(bp, args, &index); + xfs_da_brelse(args->trans, bp); + return(retval); +} + +/* + * Copy out directory entries for getdents(), for leaf directories. + */ +STATIC int +xfs_dir_leaf_getdents(xfs_trans_t *trans, xfs_inode_t *dp, uio_t *uio, + int *eofp, xfs_dirent_t *dbp, xfs_dir_put_t put) +{ + xfs_dabuf_t *bp; + int retval, eob; + + retval = xfs_da_read_buf(dp->i_transp, dp, 0, -1, &bp, XFS_DATA_FORK); + if (retval) + return(retval); + ASSERT(bp != NULL); + retval = xfs_dir_leaf_getdents_int(bp, dp, 0, uio, &eob, dbp, put, -1); + xfs_da_brelse(trans, bp); + *eofp = (eob == 0); + return(retval); +} + +/* + * Look up a name in a leaf directory structure, replace the inode number. + * This is the external routine. + */ +STATIC int +xfs_dir_leaf_replace(xfs_da_args_t *args) +{ + int index, retval; + xfs_dabuf_t *bp; + xfs_ino_t inum; + xfs_dir_leafblock_t *leaf; + xfs_dir_leaf_entry_t *entry; + xfs_dir_leaf_name_t *namest; + + inum = args->inumber; + retval = xfs_da_read_buf(args->trans, args->dp, 0, -1, &bp, + XFS_DATA_FORK); + if (retval) + return(retval); + ASSERT(bp != NULL); + retval = xfs_dir_leaf_lookup_int(bp, args, &index); + if (retval == EEXIST) { + leaf = bp->data; + entry = &leaf->entries[index]; + namest = XFS_DIR_LEAF_NAMESTRUCT(leaf, INT_GET(entry->nameidx, ARCH_CONVERT)); + /* XXX - replace assert? */ + XFS_DIR_SF_PUT_DIRINO(&inum, &namest->inumber); + xfs_da_log_buf(args->trans, bp, + XFS_DA_LOGRANGE(leaf, namest, sizeof(namest->inumber))); + xfs_da_buf_done(bp); + retval = 0; + } else + xfs_da_brelse(args->trans, bp); + return(retval); +} + + +/*======================================================================== + * External routines when dirsize > XFS_LBSIZE(mp). + *========================================================================*/ + +/* + * Add a name to a Btree-format directory. + * + * This will involve walking down the Btree, and may involve splitting + * leaf nodes and even splitting intermediate nodes up to and including + * the root node (a special case of an intermediate node). + */ +STATIC int +xfs_dir_node_addname(xfs_da_args_t *args) +{ + xfs_da_state_t *state; + xfs_da_state_blk_t *blk; + int retval, error; + + /* + * Fill in bucket of arguments/results/context to carry around. + */ + state = xfs_da_state_alloc(); + state->args = args; + state->mp = args->dp->i_mount; + state->blocksize = state->mp->m_sb.sb_blocksize; + state->node_ents = state->mp->m_dir_node_ents; + + /* + * Search to see if name already exists, and get back a pointer + * to where it should go. + */ + error = xfs_da_node_lookup_int(state, &retval); + if (error) + retval = error; + if (retval != ENOENT) + goto error; + blk = &state->path.blk[ state->path.active-1 ]; + ASSERT(blk->magic == XFS_DIR_LEAF_MAGIC); + retval = xfs_dir_leaf_add(blk->bp, args, blk->index); + if (retval == 0) { + /* + * Addition succeeded, update Btree hashvals. + */ + if (!args->justcheck) + xfs_da_fixhashpath(state, &state->path); + } else { + /* + * Addition failed, split as many Btree elements as required. + */ + if (args->total == 0) { + ASSERT(retval == ENOSPC); + goto error; + } + retval = xfs_da_split(state); + } +error: + xfs_da_state_free(state); + + return(retval); +} + +/* + * Remove a name from a B-tree directory. + * + * This will involve walking down the Btree, and may involve joining + * leaf nodes and even joining intermediate nodes up to and including + * the root node (a special case of an intermediate node). + */ +STATIC int +xfs_dir_node_removename(xfs_da_args_t *args) +{ + xfs_da_state_t *state; + xfs_da_state_blk_t *blk; + int retval, error; + + state = xfs_da_state_alloc(); + state->args = args; + state->mp = args->dp->i_mount; + state->blocksize = state->mp->m_sb.sb_blocksize; + state->node_ents = state->mp->m_dir_node_ents; + + /* + * Search to see if name exists, and get back a pointer to it. + */ + error = xfs_da_node_lookup_int(state, &retval); + if (error) + retval = error; + if (retval != EEXIST) { + xfs_da_state_free(state); + return(retval); + } + + /* + * Remove the name and update the hashvals in the tree. + */ + blk = &state->path.blk[ state->path.active-1 ]; + ASSERT(blk->magic == XFS_DIR_LEAF_MAGIC); + retval = xfs_dir_leaf_remove(args->trans, blk->bp, blk->index); + xfs_da_fixhashpath(state, &state->path); + + /* + * Check to see if the tree needs to be collapsed. + */ + error = 0; + if (retval) { + error = xfs_da_join(state); + } + + xfs_da_state_free(state); + if (error) + return(error); + return(0); +} + +/* + * Look up a filename in a int directory. + * Use an internal routine to actually do all the work. + */ +STATIC int +xfs_dir_node_lookup(xfs_da_args_t *args) +{ + xfs_da_state_t *state; + int retval, error, i; + + state = xfs_da_state_alloc(); + state->args = args; + state->mp = args->dp->i_mount; + state->blocksize = state->mp->m_sb.sb_blocksize; + state->node_ents = state->mp->m_dir_node_ents; + + /* + * Search to see if name exists, + * and get back a pointer to it. + */ + error = xfs_da_node_lookup_int(state, &retval); + if (error) { + retval = error; + } + + /* + * If not in a transaction, we have to release all the buffers. + */ + for (i = 0; i < state->path.active; i++) { + xfs_da_brelse(args->trans, state->path.blk[i].bp); + state->path.blk[i].bp = NULL; + } + + xfs_da_state_free(state); + return(retval); +} + +STATIC int +xfs_dir_node_getdents(xfs_trans_t *trans, xfs_inode_t *dp, uio_t *uio, + int *eofp, xfs_dirent_t *dbp, xfs_dir_put_t put) +{ + xfs_da_intnode_t *node; + xfs_da_node_entry_t *btree; + xfs_dir_leafblock_t *leaf = NULL; + xfs_dablk_t bno, nextbno; + xfs_dahash_t cookhash; + xfs_mount_t *mp; + int error, eob, i; + xfs_dabuf_t *bp; + xfs_daddr_t nextda; + + /* + * Pick up our context. + */ + mp = dp->i_mount; + bp = NULL; + bno = XFS_DA_COOKIE_BNO(mp, uio->uio_offset); + cookhash = XFS_DA_COOKIE_HASH(mp, uio->uio_offset); + + xfs_dir_trace_g_du("node: start", dp, uio); + + /* + * Re-find our place, even if we're confused about what our place is. + * + * First we check the block number from the magic cookie, it is a + * cache of where we ended last time. If we find a leaf block, and + * the starting hashval in that block is less than our desired + * hashval, then we run with it. + */ + if (bno > 0) { + error = xfs_da_read_buf(trans, dp, bno, -2, &bp, XFS_DATA_FORK); + if ((error != 0) && (error != EFSCORRUPTED)) + return(error); + if (bp) + leaf = bp->data; + if (bp && INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) != XFS_DIR_LEAF_MAGIC) { + xfs_dir_trace_g_dub("node: block not a leaf", + dp, uio, bno); + xfs_da_brelse(trans, bp); + bp = NULL; + } + if (bp && INT_GET(leaf->entries[0].hashval, ARCH_CONVERT) > cookhash) { + xfs_dir_trace_g_dub("node: leaf hash too large", + dp, uio, bno); + xfs_da_brelse(trans, bp); + bp = NULL; + } + if (bp && + cookhash > INT_GET(leaf->entries[INT_GET(leaf->hdr.count, ARCH_CONVERT) - 1].hashval, ARCH_CONVERT)) { + xfs_dir_trace_g_dub("node: leaf hash too small", + dp, uio, bno); + xfs_da_brelse(trans, bp); + bp = NULL; + } + } + + /* + * If we did not find a leaf block from the blockno in the cookie, + * or we there was no blockno in the cookie (eg: first time thru), + * the we start at the top of the Btree and re-find our hashval. + */ + if (bp == NULL) { + xfs_dir_trace_g_du("node: start at root" , dp, uio); + bno = 0; + for (;;) { + error = xfs_da_read_buf(trans, dp, bno, -1, &bp, + XFS_DATA_FORK); + if (error) + return(error); + if (bp == NULL) + return(XFS_ERROR(EFSCORRUPTED)); + node = bp->data; + if (INT_GET(node->hdr.info.magic, ARCH_CONVERT) != XFS_DA_NODE_MAGIC) + break; + btree = &node->btree[0]; + xfs_dir_trace_g_dun("node: node detail", dp, uio, node); + for (i = 0; i < INT_GET(node->hdr.count, ARCH_CONVERT); btree++, i++) { + if (INT_GET(btree->hashval, ARCH_CONVERT) >= cookhash) { + bno = INT_GET(btree->before, ARCH_CONVERT); + break; + } + } + if (i == INT_GET(node->hdr.count, ARCH_CONVERT)) { + xfs_da_brelse(trans, bp); + xfs_dir_trace_g_du("node: hash beyond EOF", + dp, uio); + uio->uio_offset = XFS_DA_MAKE_COOKIE(mp, 0, 0, + XFS_DA_MAXHASH); + *eofp = 1; + return(0); + } + xfs_dir_trace_g_dub("node: going to block", + dp, uio, bno); + xfs_da_brelse(trans, bp); + } + } + ASSERT(cookhash != XFS_DA_MAXHASH); + + /* + * We've dropped down to the (first) leaf block that contains the + * hashval we are interested in. Continue rolling upward thru the + * leaf blocks until we fill up our buffer. + */ + for (;;) { + leaf = bp->data; + if (unlikely(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) != XFS_DIR_LEAF_MAGIC)) { + xfs_dir_trace_g_dul("node: not a leaf", dp, uio, leaf); + xfs_da_brelse(trans, bp); + XFS_CORRUPTION_ERROR("xfs_dir_node_getdents(1)", + XFS_ERRLEVEL_LOW, mp, leaf); + return XFS_ERROR(EFSCORRUPTED); + } + xfs_dir_trace_g_dul("node: leaf detail", dp, uio, leaf); + if ((nextbno = INT_GET(leaf->hdr.info.forw, ARCH_CONVERT))) { + nextda = xfs_da_reada_buf(trans, dp, nextbno, + XFS_DATA_FORK); + } else + nextda = -1; + error = xfs_dir_leaf_getdents_int(bp, dp, bno, uio, &eob, dbp, + put, nextda); + xfs_da_brelse(trans, bp); + bno = nextbno; + if (eob) { + xfs_dir_trace_g_dub("node: E-O-B", dp, uio, bno); + *eofp = 0; + return(error); + } + if (bno == 0) + break; + error = xfs_da_read_buf(trans, dp, bno, nextda, &bp, + XFS_DATA_FORK); + if (error) + return(error); + if (unlikely(bp == NULL)) { + XFS_ERROR_REPORT("xfs_dir_node_getdents(2)", + XFS_ERRLEVEL_LOW, mp); + return(XFS_ERROR(EFSCORRUPTED)); + } + } + *eofp = 1; + xfs_dir_trace_g_du("node: E-O-F", dp, uio); + return(0); +} + +/* + * Look up a filename in an int directory, replace the inode number. + * Use an internal routine to actually do the lookup. + */ +STATIC int +xfs_dir_node_replace(xfs_da_args_t *args) +{ + xfs_da_state_t *state; + xfs_da_state_blk_t *blk; + xfs_dir_leafblock_t *leaf; + xfs_dir_leaf_entry_t *entry; + xfs_dir_leaf_name_t *namest; + xfs_ino_t inum; + int retval, error, i; + xfs_dabuf_t *bp; + + state = xfs_da_state_alloc(); + state->args = args; + state->mp = args->dp->i_mount; + state->blocksize = state->mp->m_sb.sb_blocksize; + state->node_ents = state->mp->m_dir_node_ents; + inum = args->inumber; + + /* + * Search to see if name exists, + * and get back a pointer to it. + */ + error = xfs_da_node_lookup_int(state, &retval); + if (error) { + retval = error; + } + + if (retval == EEXIST) { + blk = &state->path.blk[state->path.active - 1]; + ASSERT(blk->magic == XFS_DIR_LEAF_MAGIC); + bp = blk->bp; + leaf = bp->data; + entry = &leaf->entries[blk->index]; + namest = XFS_DIR_LEAF_NAMESTRUCT(leaf, INT_GET(entry->nameidx, ARCH_CONVERT)); + /* XXX - replace assert ? */ + XFS_DIR_SF_PUT_DIRINO(&inum, &namest->inumber); + xfs_da_log_buf(args->trans, bp, + XFS_DA_LOGRANGE(leaf, namest, sizeof(namest->inumber))); + xfs_da_buf_done(bp); + blk->bp = NULL; + retval = 0; + } else { + i = state->path.active - 1; + xfs_da_brelse(args->trans, state->path.blk[i].bp); + state->path.blk[i].bp = NULL; + } + for (i = 0; i < state->path.active - 1; i++) { + xfs_da_brelse(args->trans, state->path.blk[i].bp); + state->path.blk[i].bp = NULL; + } + + xfs_da_state_free(state); + return(retval); +} + +#if defined(XFS_DIR_TRACE) +/* + * Add a trace buffer entry for an inode and a uio. + */ +void +xfs_dir_trace_g_du(char *where, xfs_inode_t *dp, uio_t *uio) +{ + xfs_dir_trace_enter(XFS_DIR_KTRACE_G_DU, where, + (void *)dp, (void *)dp->i_mount, + (void *)((unsigned long)(uio->uio_offset >> 32)), + (void *)((unsigned long)(uio->uio_offset & 0xFFFFFFFF)), + (void *)(unsigned long)uio->uio_resid, + NULL, NULL, NULL, NULL, NULL, NULL, NULL); +} + +/* + * Add a trace buffer entry for an inode and a uio. + */ +void +xfs_dir_trace_g_dub(char *where, xfs_inode_t *dp, uio_t *uio, xfs_dablk_t bno) +{ + xfs_dir_trace_enter(XFS_DIR_KTRACE_G_DUB, where, + (void *)dp, (void *)dp->i_mount, + (void *)((unsigned long)(uio->uio_offset >> 32)), + (void *)((unsigned long)(uio->uio_offset & 0xFFFFFFFF)), + (void *)(unsigned long)uio->uio_resid, + (void *)(unsigned long)bno, + NULL, NULL, NULL, NULL, NULL, NULL); +} + +/* + * Add a trace buffer entry for an inode and a uio. + */ +void +xfs_dir_trace_g_dun(char *where, xfs_inode_t *dp, uio_t *uio, + xfs_da_intnode_t *node) +{ + int last = INT_GET(node->hdr.count, ARCH_CONVERT) - 1; + + xfs_dir_trace_enter(XFS_DIR_KTRACE_G_DUN, where, + (void *)dp, (void *)dp->i_mount, + (void *)((unsigned long)(uio->uio_offset >> 32)), + (void *)((unsigned long)(uio->uio_offset & 0xFFFFFFFF)), + (void *)(unsigned long)uio->uio_resid, + (void *)(unsigned long) + INT_GET(node->hdr.info.forw, ARCH_CONVERT), + (void *)(unsigned long) + INT_GET(node->hdr.count, ARCH_CONVERT), + (void *)(unsigned long) + INT_GET(node->btree[0].hashval, ARCH_CONVERT), + (void *)(unsigned long) + INT_GET(node->btree[last].hashval, ARCH_CONVERT), + NULL, NULL, NULL); +} + +/* + * Add a trace buffer entry for an inode and a uio. + */ +void +xfs_dir_trace_g_dul(char *where, xfs_inode_t *dp, uio_t *uio, + xfs_dir_leafblock_t *leaf) +{ + int last = INT_GET(leaf->hdr.count, ARCH_CONVERT) - 1; + + xfs_dir_trace_enter(XFS_DIR_KTRACE_G_DUL, where, + (void *)dp, (void *)dp->i_mount, + (void *)((unsigned long)(uio->uio_offset >> 32)), + (void *)((unsigned long)(uio->uio_offset & 0xFFFFFFFF)), + (void *)(unsigned long)uio->uio_resid, + (void *)(unsigned long) + INT_GET(leaf->hdr.info.forw, ARCH_CONVERT), + (void *)(unsigned long) + INT_GET(leaf->hdr.count, ARCH_CONVERT), + (void *)(unsigned long) + INT_GET(leaf->entries[0].hashval, ARCH_CONVERT), + (void *)(unsigned long) + INT_GET(leaf->entries[last].hashval, ARCH_CONVERT), + NULL, NULL, NULL); +} + +/* + * Add a trace buffer entry for an inode and a uio. + */ +void +xfs_dir_trace_g_due(char *where, xfs_inode_t *dp, uio_t *uio, + xfs_dir_leaf_entry_t *entry) +{ + xfs_dir_trace_enter(XFS_DIR_KTRACE_G_DUE, where, + (void *)dp, (void *)dp->i_mount, + (void *)((unsigned long)(uio->uio_offset >> 32)), + (void *)((unsigned long)(uio->uio_offset & 0xFFFFFFFF)), + (void *)(unsigned long)uio->uio_resid, + (void *)(unsigned long) + INT_GET(entry->hashval, ARCH_CONVERT), + NULL, NULL, NULL, NULL, NULL, NULL); +} + +/* + * Add a trace buffer entry for an inode and a uio. + */ +void +xfs_dir_trace_g_duc(char *where, xfs_inode_t *dp, uio_t *uio, xfs_off_t cookie) +{ + xfs_dir_trace_enter(XFS_DIR_KTRACE_G_DUC, where, + (void *)dp, (void *)dp->i_mount, + (void *)((unsigned long)(uio->uio_offset >> 32)), + (void *)((unsigned long)(uio->uio_offset & 0xFFFFFFFF)), + (void *)(unsigned long)uio->uio_resid, + (void *)((unsigned long)(cookie >> 32)), + (void *)((unsigned long)(cookie & 0xFFFFFFFF)), + NULL, NULL, NULL, NULL, NULL); +} + +/* + * Add a trace buffer entry for the arguments given to the routine, + * generic form. + */ +void +xfs_dir_trace_enter(int type, char *where, + void * a0, void * a1, + void * a2, void * a3, + void * a4, void * a5, + void * a6, void * a7, + void * a8, void * a9, + void * a10, void * a11) +{ + ASSERT(xfs_dir_trace_buf); + ktrace_enter(xfs_dir_trace_buf, (void *)(unsigned long)type, + (void *)where, + (void *)a0, (void *)a1, (void *)a2, + (void *)a3, (void *)a4, (void *)a5, + (void *)a6, (void *)a7, (void *)a8, + (void *)a9, (void *)a10, (void *)a11, + NULL, NULL); +} +#endif /* XFS_DIR_TRACE */ |