diff options
Diffstat (limited to 'fs/xfs/xfs_attr_leaf.c')
| -rw-r--r-- | fs/xfs/xfs_attr_leaf.c | 351 |
1 files changed, 155 insertions, 196 deletions
diff --git a/fs/xfs/xfs_attr_leaf.c b/fs/xfs/xfs_attr_leaf.c index 9455051f0120..9719bbef122c 100644 --- a/fs/xfs/xfs_attr_leaf.c +++ b/fs/xfs/xfs_attr_leaf.c @@ -89,9 +89,46 @@ STATIC void xfs_attr_leaf_moveents(xfs_attr_leafblock_t *src_leaf, int dst_start, int move_count, xfs_mount_t *mp); STATIC int xfs_attr_leaf_entsize(xfs_attr_leafblock_t *leaf, int index); -STATIC int xfs_attr_put_listent(xfs_attr_list_context_t *context, - attrnames_t *, char *name, int namelen, - int valuelen); + +/*======================================================================== + * Namespace helper routines + *========================================================================*/ + +STATIC inline attrnames_t * +xfs_attr_flags_namesp(int flags) +{ + return ((flags & XFS_ATTR_SECURE) ? &attr_secure: + ((flags & XFS_ATTR_ROOT) ? &attr_trusted : &attr_user)); +} + +/* + * If namespace bits don't match return 0. + * If all match then return 1. + */ +STATIC inline int +xfs_attr_namesp_match(int arg_flags, int ondisk_flags) +{ + return XFS_ATTR_NSP_ONDISK(ondisk_flags) == XFS_ATTR_NSP_ARGS_TO_ONDISK(arg_flags); +} + +/* + * If namespace bits don't match and we don't have an override for it + * then return 0. + * If all match or are overridable then return 1. + */ +STATIC inline int +xfs_attr_namesp_match_overrides(int arg_flags, int ondisk_flags) +{ + if (((arg_flags & ATTR_SECURE) == 0) != + ((ondisk_flags & XFS_ATTR_SECURE) == 0) && + !(arg_flags & ATTR_KERNORMALS)) + return 0; + if (((arg_flags & ATTR_ROOT) == 0) != + ((ondisk_flags & XFS_ATTR_ROOT) == 0) && + !(arg_flags & ATTR_KERNROOTLS)) + return 0; + return 1; +} /*======================================================================== @@ -228,11 +265,7 @@ xfs_attr_shortform_add(xfs_da_args_t *args, int forkoff) continue; if (memcmp(args->name, sfe->nameval, args->namelen) != 0) continue; - if (((args->flags & ATTR_SECURE) != 0) != - ((sfe->flags & XFS_ATTR_SECURE) != 0)) - continue; - if (((args->flags & ATTR_ROOT) != 0) != - ((sfe->flags & XFS_ATTR_ROOT) != 0)) + if (!xfs_attr_namesp_match(args->flags, sfe->flags)) continue; ASSERT(0); #endif @@ -246,8 +279,7 @@ xfs_attr_shortform_add(xfs_da_args_t *args, int forkoff) sfe->namelen = args->namelen; sfe->valuelen = args->valuelen; - sfe->flags = (args->flags & ATTR_SECURE) ? XFS_ATTR_SECURE : - ((args->flags & ATTR_ROOT) ? XFS_ATTR_ROOT : 0); + sfe->flags = XFS_ATTR_NSP_ARGS_TO_ONDISK(args->flags); memcpy(sfe->nameval, args->name, args->namelen); memcpy(&sfe->nameval[args->namelen], args->value, args->valuelen); sf->hdr.count++; @@ -282,11 +314,7 @@ xfs_attr_shortform_remove(xfs_da_args_t *args) continue; if (memcmp(sfe->nameval, args->name, args->namelen) != 0) continue; - if (((args->flags & ATTR_SECURE) != 0) != - ((sfe->flags & XFS_ATTR_SECURE) != 0)) - continue; - if (((args->flags & ATTR_ROOT) != 0) != - ((sfe->flags & XFS_ATTR_ROOT) != 0)) + if (!xfs_attr_namesp_match(args->flags, sfe->flags)) continue; break; } @@ -363,11 +391,7 @@ xfs_attr_shortform_lookup(xfs_da_args_t *args) continue; if (memcmp(args->name, sfe->nameval, args->namelen) != 0) continue; - if (((args->flags & ATTR_SECURE) != 0) != - ((sfe->flags & XFS_ATTR_SECURE) != 0)) - continue; - if (((args->flags & ATTR_ROOT) != 0) != - ((sfe->flags & XFS_ATTR_ROOT) != 0)) + if (!xfs_attr_namesp_match(args->flags, sfe->flags)) continue; return(XFS_ERROR(EEXIST)); } @@ -394,11 +418,7 @@ xfs_attr_shortform_getvalue(xfs_da_args_t *args) continue; if (memcmp(args->name, sfe->nameval, args->namelen) != 0) continue; - if (((args->flags & ATTR_SECURE) != 0) != - ((sfe->flags & XFS_ATTR_SECURE) != 0)) - continue; - if (((args->flags & ATTR_ROOT) != 0) != - ((sfe->flags & XFS_ATTR_ROOT) != 0)) + if (!xfs_attr_namesp_match(args->flags, sfe->flags)) continue; if (args->flags & ATTR_KERNOVAL) { args->valuelen = sfe->valuelen; @@ -485,8 +505,7 @@ xfs_attr_shortform_to_leaf(xfs_da_args_t *args) nargs.valuelen = sfe->valuelen; nargs.hashval = xfs_da_hashname((char *)sfe->nameval, sfe->namelen); - nargs.flags = (sfe->flags & XFS_ATTR_SECURE) ? ATTR_SECURE : - ((sfe->flags & XFS_ATTR_ROOT) ? ATTR_ROOT : 0); + nargs.flags = XFS_ATTR_NSP_ONDISK_TO_ARGS(sfe->flags); error = xfs_attr_leaf_lookup_int(bp, &nargs); /* set a->index */ ASSERT(error == ENOATTR); error = xfs_attr_leaf_add(bp, &nargs); @@ -520,6 +539,10 @@ xfs_attr_shortform_compare(const void *a, const void *b) } } + +#define XFS_ISRESET_CURSOR(cursor) \ + (!((cursor)->initted) && !((cursor)->hashval) && \ + !((cursor)->blkno) && !((cursor)->offset)) /* * Copy out entries of shortform attribute lists for attr_list(). * Shortform attribute lists are not stored in hashval sorted order. @@ -537,6 +560,7 @@ xfs_attr_shortform_list(xfs_attr_list_context_t *context) xfs_attr_sf_entry_t *sfe; xfs_inode_t *dp; int sbsize, nsbuf, count, i; + int error; ASSERT(context != NULL); dp = context->dp; @@ -552,46 +576,51 @@ xfs_attr_shortform_list(xfs_attr_list_context_t *context) xfs_attr_trace_l_c("sf start", context); /* - * If the buffer is large enough, do not bother with sorting. + * If the buffer is large enough and the cursor is at the start, + * do not bother with sorting since we will return everything in + * one buffer and another call using the cursor won't need to be + * made. * Note the generous fudge factor of 16 overhead bytes per entry. + * If bufsize is zero then put_listent must be a search function + * and can just scan through what we have. */ - if ((dp->i_afp->if_bytes + sf->hdr.count * 16) < context->bufsize) { + if (context->bufsize == 0 || + (XFS_ISRESET_CURSOR(cursor) && + (dp->i_afp->if_bytes + sf->hdr.count * 16) < context->bufsize)) { for (i = 0, sfe = &sf->list[0]; i < sf->hdr.count; i++) { attrnames_t *namesp; - if (((context->flags & ATTR_SECURE) != 0) != - ((sfe->flags & XFS_ATTR_SECURE) != 0) && - !(context->flags & ATTR_KERNORMALS)) { - sfe = XFS_ATTR_SF_NEXTENTRY(sfe); - continue; - } - if (((context->flags & ATTR_ROOT) != 0) != - ((sfe->flags & XFS_ATTR_ROOT) != 0) && - !(context->flags & ATTR_KERNROOTLS)) { + if (!xfs_attr_namesp_match_overrides(context->flags, sfe->flags)) { sfe = XFS_ATTR_SF_NEXTENTRY(sfe); continue; } - namesp = (sfe->flags & XFS_ATTR_SECURE) ? &attr_secure: - ((sfe->flags & XFS_ATTR_ROOT) ? &attr_trusted : - &attr_user); - if (context->flags & ATTR_KERNOVAL) { - ASSERT(context->flags & ATTR_KERNAMELS); - context->count += namesp->attr_namelen + - sfe->namelen + 1; - } - else { - if (xfs_attr_put_listent(context, namesp, - (char *)sfe->nameval, - (int)sfe->namelen, - (int)sfe->valuelen)) - break; - } + namesp = xfs_attr_flags_namesp(sfe->flags); + error = context->put_listent(context, + namesp, + (char *)sfe->nameval, + (int)sfe->namelen, + (int)sfe->valuelen, + (char*)&sfe->nameval[sfe->namelen]); + + /* + * Either search callback finished early or + * didn't fit it all in the buffer after all. + */ + if (context->seen_enough) + break; + + if (error) + return error; sfe = XFS_ATTR_SF_NEXTENTRY(sfe); } xfs_attr_trace_l_c("sf big-gulp", context); return(0); } + /* do no more for a search callback */ + if (context->bufsize == 0) + return 0; + /* * It didn't all fit, so we have to sort everything on hashval. */ @@ -614,15 +643,7 @@ xfs_attr_shortform_list(xfs_attr_list_context_t *context) kmem_free(sbuf, sbsize); return XFS_ERROR(EFSCORRUPTED); } - if (((context->flags & ATTR_SECURE) != 0) != - ((sfe->flags & XFS_ATTR_SECURE) != 0) && - !(context->flags & ATTR_KERNORMALS)) { - sfe = XFS_ATTR_SF_NEXTENTRY(sfe); - continue; - } - if (((context->flags & ATTR_ROOT) != 0) != - ((sfe->flags & XFS_ATTR_ROOT) != 0) && - !(context->flags & ATTR_KERNROOTLS)) { + if (!xfs_attr_namesp_match_overrides(context->flags, sfe->flags)) { sfe = XFS_ATTR_SF_NEXTENTRY(sfe); continue; } @@ -671,24 +692,22 @@ xfs_attr_shortform_list(xfs_attr_list_context_t *context) for ( ; i < nsbuf; i++, sbp++) { attrnames_t *namesp; - namesp = (sbp->flags & XFS_ATTR_SECURE) ? &attr_secure : - ((sbp->flags & XFS_ATTR_ROOT) ? &attr_trusted : - &attr_user); + namesp = xfs_attr_flags_namesp(sbp->flags); if (cursor->hashval != sbp->hash) { cursor->hashval = sbp->hash; cursor->offset = 0; } - if (context->flags & ATTR_KERNOVAL) { - ASSERT(context->flags & ATTR_KERNAMELS); - context->count += namesp->attr_namelen + - sbp->namelen + 1; - } else { - if (xfs_attr_put_listent(context, namesp, - sbp->name, sbp->namelen, - sbp->valuelen)) - break; - } + error = context->put_listent(context, + namesp, + sbp->name, + sbp->namelen, + sbp->valuelen, + &sbp->name[sbp->namelen]); + if (error) + return error; + if (context->seen_enough) + break; cursor->offset++; } @@ -810,8 +829,7 @@ xfs_attr_leaf_to_shortform(xfs_dabuf_t *bp, xfs_da_args_t *args, int forkoff) nargs.value = (char *)&name_loc->nameval[nargs.namelen]; nargs.valuelen = be16_to_cpu(name_loc->valuelen); nargs.hashval = be32_to_cpu(entry->hashval); - nargs.flags = (entry->flags & XFS_ATTR_SECURE) ? ATTR_SECURE : - ((entry->flags & XFS_ATTR_ROOT) ? ATTR_ROOT : 0); + nargs.flags = XFS_ATTR_NSP_ONDISK_TO_ARGS(entry->flags); xfs_attr_shortform_add(&nargs, forkoff); } error = 0; @@ -1098,8 +1116,7 @@ xfs_attr_leaf_add_work(xfs_dabuf_t *bp, xfs_da_args_t *args, int mapindex) be16_to_cpu(map->size)); entry->hashval = cpu_to_be32(args->hashval); entry->flags = tmp ? XFS_ATTR_LOCAL : 0; - entry->flags |= (args->flags & ATTR_SECURE) ? XFS_ATTR_SECURE : - ((args->flags & ATTR_ROOT) ? XFS_ATTR_ROOT : 0); + entry->flags |= XFS_ATTR_NSP_ARGS_TO_ONDISK(args->flags); if (args->rename) { entry->flags |= XFS_ATTR_INCOMPLETE; if ((args->blkno2 == args->blkno) && @@ -1926,7 +1943,7 @@ xfs_attr_leaf_lookup_int(xfs_dabuf_t *bp, xfs_da_args_t *args) else break; } - ASSERT((probe >= 0) && + ASSERT((probe >= 0) && (!leaf->hdr.count || (probe < be16_to_cpu(leaf->hdr.count)))); ASSERT((span <= 4) || (be32_to_cpu(entry->hashval) == hashval)); @@ -1971,14 +1988,9 @@ xfs_attr_leaf_lookup_int(xfs_dabuf_t *bp, xfs_da_args_t *args) name_loc = XFS_ATTR_LEAF_NAME_LOCAL(leaf, probe); if (name_loc->namelen != args->namelen) continue; - if (memcmp(args->name, (char *)name_loc->nameval, - args->namelen) != 0) + if (memcmp(args->name, (char *)name_loc->nameval, args->namelen) != 0) continue; - if (((args->flags & ATTR_SECURE) != 0) != - ((entry->flags & XFS_ATTR_SECURE) != 0)) - continue; - if (((args->flags & ATTR_ROOT) != 0) != - ((entry->flags & XFS_ATTR_ROOT) != 0)) + if (!xfs_attr_namesp_match(args->flags, entry->flags)) continue; args->index = probe; return(XFS_ERROR(EEXIST)); @@ -1989,11 +2001,7 @@ xfs_attr_leaf_lookup_int(xfs_dabuf_t *bp, xfs_da_args_t *args) if (memcmp(args->name, (char *)name_rmt->name, args->namelen) != 0) continue; - if (((args->flags & ATTR_SECURE) != 0) != - ((entry->flags & XFS_ATTR_SECURE) != 0)) - continue; - if (((args->flags & ATTR_ROOT) != 0) != - ((entry->flags & XFS_ATTR_ROOT) != 0)) + if (!xfs_attr_namesp_match(args->flags, entry->flags)) continue; args->index = probe; args->rmtblkno = be32_to_cpu(name_rmt->valueblk); @@ -2312,8 +2320,6 @@ xfs_attr_leaf_list_int(xfs_dabuf_t *bp, xfs_attr_list_context_t *context) attrlist_cursor_kern_t *cursor; xfs_attr_leafblock_t *leaf; xfs_attr_leaf_entry_t *entry; - xfs_attr_leaf_name_local_t *name_loc; - xfs_attr_leaf_name_remote_t *name_rmt; int retval, i; ASSERT(bp != NULL); @@ -2355,9 +2361,8 @@ xfs_attr_leaf_list_int(xfs_dabuf_t *bp, xfs_attr_list_context_t *context) * We have found our place, start copying out the new attributes. */ retval = 0; - for ( ; (i < be16_to_cpu(leaf->hdr.count)) - && (retval == 0); entry++, i++) { - attrnames_t *namesp; + for ( ; (i < be16_to_cpu(leaf->hdr.count)); entry++, i++) { + attrnames_t *namesp; if (be32_to_cpu(entry->hashval) != cursor->hashval) { cursor->hashval = be32_to_cpu(entry->hashval); @@ -2366,115 +2371,69 @@ xfs_attr_leaf_list_int(xfs_dabuf_t *bp, xfs_attr_list_context_t *context) if (entry->flags & XFS_ATTR_INCOMPLETE) continue; /* skip incomplete entries */ - if (((context->flags & ATTR_SECURE) != 0) != - ((entry->flags & XFS_ATTR_SECURE) != 0) && - !(context->flags & ATTR_KERNORMALS)) - continue; /* skip non-matching entries */ - if (((context->flags & ATTR_ROOT) != 0) != - ((entry->flags & XFS_ATTR_ROOT) != 0) && - !(context->flags & ATTR_KERNROOTLS)) - continue; /* skip non-matching entries */ - - namesp = (entry->flags & XFS_ATTR_SECURE) ? &attr_secure : - ((entry->flags & XFS_ATTR_ROOT) ? &attr_trusted : - &attr_user); + if (!xfs_attr_namesp_match_overrides(context->flags, entry->flags)) + continue; + + namesp = xfs_attr_flags_namesp(entry->flags); if (entry->flags & XFS_ATTR_LOCAL) { - name_loc = XFS_ATTR_LEAF_NAME_LOCAL(leaf, i); - if (context->flags & ATTR_KERNOVAL) { - ASSERT(context->flags & ATTR_KERNAMELS); - context->count += namesp->attr_namelen + - (int)name_loc->namelen + 1; - } else { - retval = xfs_attr_put_listent(context, namesp, - (char *)name_loc->nameval, - (int)name_loc->namelen, - be16_to_cpu(name_loc->valuelen)); - } + xfs_attr_leaf_name_local_t *name_loc = + XFS_ATTR_LEAF_NAME_LOCAL(leaf, i); + + retval = context->put_listent(context, + namesp, + (char *)name_loc->nameval, + (int)name_loc->namelen, + be16_to_cpu(name_loc->valuelen), + (char *)&name_loc->nameval[name_loc->namelen]); + if (retval) + return retval; } else { - name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf, i); - if (context->flags & ATTR_KERNOVAL) { - ASSERT(context->flags & ATTR_KERNAMELS); - context->count += namesp->attr_namelen + - (int)name_rmt->namelen + 1; - } else { - retval = xfs_attr_put_listent(context, namesp, - (char *)name_rmt->name, - (int)name_rmt->namelen, - be32_to_cpu(name_rmt->valuelen)); + xfs_attr_leaf_name_remote_t *name_rmt = + XFS_ATTR_LEAF_NAME_REMOTE(leaf, i); + + int valuelen = be32_to_cpu(name_rmt->valuelen); + + if (context->put_value) { + xfs_da_args_t args; + + memset((char *)&args, 0, sizeof(args)); + args.dp = context->dp; + args.whichfork = XFS_ATTR_FORK; + args.valuelen = valuelen; + args.value = kmem_alloc(valuelen, KM_SLEEP); + args.rmtblkno = be32_to_cpu(name_rmt->valueblk); + args.rmtblkcnt = XFS_B_TO_FSB(args.dp->i_mount, valuelen); + retval = xfs_attr_rmtval_get(&args); + if (retval) + return retval; + retval = context->put_listent(context, + namesp, + (char *)name_rmt->name, + (int)name_rmt->namelen, + valuelen, + (char*)args.value); + kmem_free(args.value, valuelen); } + else { + retval = context->put_listent(context, + namesp, + (char *)name_rmt->name, + (int)name_rmt->namelen, + valuelen, + NULL); + } + if (retval) + return retval; } - if (retval == 0) { - cursor->offset++; - } + if (context->seen_enough) + break; + cursor->offset++; } xfs_attr_trace_l_cl("blk end", context, leaf); return(retval); } -#define ATTR_ENTBASESIZE /* minimum bytes used by an attr */ \ - (((struct attrlist_ent *) 0)->a_name - (char *) 0) -#define ATTR_ENTSIZE(namelen) /* actual bytes used by an attr */ \ - ((ATTR_ENTBASESIZE + (namelen) + 1 + sizeof(u_int32_t)-1) \ - & ~(sizeof(u_int32_t)-1)) - -/* - * Format an attribute and copy it out to the user's buffer. - * Take care to check values and protect against them changing later, - * we may be reading them directly out of a user buffer. - */ -/*ARGSUSED*/ -STATIC int -xfs_attr_put_listent(xfs_attr_list_context_t *context, - attrnames_t *namesp, char *name, int namelen, int valuelen) -{ - attrlist_ent_t *aep; - int arraytop; - - ASSERT(!(context->flags & ATTR_KERNOVAL)); - if (context->flags & ATTR_KERNAMELS) { - char *offset; - - ASSERT(context->count >= 0); - - arraytop = context->count + namesp->attr_namelen + namelen + 1; - if (arraytop > context->firstu) { - context->count = -1; /* insufficient space */ - return(1); - } - offset = (char *)context->alist + context->count; - strncpy(offset, namesp->attr_name, namesp->attr_namelen); - offset += namesp->attr_namelen; - strncpy(offset, name, namelen); /* real name */ - offset += namelen; - *offset = '\0'; - context->count += namesp->attr_namelen + namelen + 1; - return(0); - } - - ASSERT(context->count >= 0); - ASSERT(context->count < (ATTR_MAX_VALUELEN/8)); - ASSERT(context->firstu >= sizeof(*context->alist)); - ASSERT(context->firstu <= context->bufsize); - - arraytop = sizeof(*context->alist) + - context->count * sizeof(context->alist->al_offset[0]); - context->firstu -= ATTR_ENTSIZE(namelen); - if (context->firstu < arraytop) { - xfs_attr_trace_l_c("buffer full", context); - context->alist->al_more = 1; - return(1); - } - - aep = (attrlist_ent_t *)&(((char *)context->alist)[ context->firstu ]); - aep->a_valuelen = valuelen; - memcpy(aep->a_name, name, namelen); - aep->a_name[ namelen ] = 0; - context->alist->al_offset[ context->count++ ] = context->firstu; - context->alist->al_count = context->count; - xfs_attr_trace_l_c("add", context); - return(0); -} /*======================================================================== * Manage the INCOMPLETE flag in a leaf entry |