4857d5d554
. move cache size heuristic from mfs there so mfs and ext2 can share it . add vfs credentials retrieving function, with backwards compatability from previous struct format, to be used by both ext2 and mfs . fix for ext2 - STATICINIT was fed no. of bytes instead of no. of elements, overallocating memory by a megabyte or two for the superblock
52 lines
1.5 KiB
C
52 lines
1.5 KiB
C
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#include <minix/vfsif.h>
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#include <minix/type.h>
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#include <assert.h>
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#include "minixfs.h"
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int fs_lookup_credentials(vfs_ucred_t *credentials,
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uid_t *caller_uid, gid_t *caller_gid, cp_grant_id_t grant2, size_t cred_size)
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{
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vfs_ucred_old_t old_cred;
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int r;
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memset(credentials, 0, sizeof(*credentials));
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if(cred_size == sizeof(*credentials)) {
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r = sys_safecopyfrom(VFS_PROC_NR, grant2, (vir_bytes) 0,
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(vir_bytes) credentials, cred_size, D);
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if (r != OK) {
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printf("FS: cred copy (regular) failed.\n");
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return(r);
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}
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} else if(cred_size == sizeof(old_cred)) {
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int g;
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r = sys_safecopyfrom(VFS_PROC_NR, grant2, (vir_bytes) 0,
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(vir_bytes) &old_cred, sizeof(old_cred), D);
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if (r != OK) {
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printf("FS: cred copy (fallback) failed.\n");
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return(r);
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}
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credentials->vu_ngroups = old_cred.vu_ngroups;
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credentials->vu_uid = old_cred.vu_uid;
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credentials->vu_gid = old_cred.vu_gid;
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for(g = 0; g < NGROUPS_MAX_OLD; g++) {
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assert(g < NGROUPS_MAX);
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credentials->vu_sgroups[g] = old_cred.vu_sgroups[g];
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}
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} else {
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static int w = 0;
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if(!w) { printf("FS: cred size incompatible with VFS.\n"); w = 1; }
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return(EINVAL); /* Wrong size. */
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}
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assert(credentials->vu_ngroups <= NGROUPS_MAX);
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*caller_uid = credentials->vu_uid;
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*caller_gid = credentials->vu_gid;
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return OK;
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}
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