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Implement ATTR_CMN_OBJTAG and ATTR_DIR_ENTRYCOUNT for getattrlist
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src/kernel/emulation/linux/xattr/getattrlist_generic.c
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src/kernel/emulation/linux/xattr/getattrlist_generic.c
···
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#include <sys/errno.h>
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#include "../common_at.h"
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#include "../vchroot_expand.h"
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#include "../dirent/getdirentries.h"
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#include "../unistd/dup.h"
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#include "../fcntl/open.h"
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#include <lkm/api.h>
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#include <linux-syscalls/linux.h>
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#include <stddef.h>
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#define ATTR_BIT_MAP_COUNT 5
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#define COMMON_SUPPORTED (ATTR_CMN_FNDRINFO)
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#define COMMON_SUPPORTED (ATTR_CMN_FNDRINFO | ATTR_CMN_OBJTAG)
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#define VOLUME_SUPPORTED 0
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#define DIR_SUPPORTED 0
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#define DIR_SUPPORTED (ATTR_DIR_ENTRYCOUNT)
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#define FILE_SUPPORTED (ATTR_FILE_RSRCLENGTH)
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#define FORK_SUPPORTED 0
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#define ATTR_CMN_FNDRINFO 0x4000
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#define ATTR_FILE_RSRCLENGTH 0x1000
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#define ATTR_CMN_OBJTAG 0x00000010
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#define ATTR_DIR_ENTRYCOUNT 0x00000002
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#define XATTR_FINDER_INFO "com.apple.FinderInfo"
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#define XATTR_RESOURCE_FORK "com.apple.ResourceFork"
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#define FSOPT_NOFOLLOW 1
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#define FSOPT_REPORT_FULLSIZE 4
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#define VT_HFS 16
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#define min(a,b) (((a) < (b)) ? (a) : (b))
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···
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spaceNeeded += 32;
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if (alist->fileattr & ATTR_FILE_RSRCLENGTH)
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spaceNeeded += 8; // off_t
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if (alist->commonattr & ATTR_CMN_OBJTAG)
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spaceNeeded += sizeof(uint32_t); // fsobj_tag_t
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if (alist->dirattr & ATTR_DIR_ENTRYCOUNT)
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spaceNeeded += sizeof(uint32_t);
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ourBuffer = (char*) __builtin_alloca(spaceNeeded);
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next = ourBuffer + 4;
···
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*((uint32_t*) next) = 0;
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else
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*((uint32_t*) next) = rv;
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next += 4;
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}
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if (alist->commonattr & ATTR_CMN_OBJTAG) {
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// pretend we're always on HFS
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*((uint32_t*)next) = VT_HFS;
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next += 4;
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}
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if (alist->dirattr & ATTR_DIR_ENTRYCOUNT) {
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char buf[1024]; // maybe this should be smaller?
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int tmp_fd;
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*((uint32_t*)next) = 0;
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#if HAS_PATH
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tmp_fd = LINUX_SYSCALL(__NR_openat, vc.dfd, vc.path, LINUX_O_RDONLY | LINUX_O_DIRECTORY, 0);
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if (tmp_fd < 0) {
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rv = -EIO; // translate all errors into EIO (to avoid confusing our caller)
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goto attr_dir_entrycount_out_no_fd;
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}
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#else
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// dupe it to avoid advancing the internal `getdents` position if our caller is using that
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tmp_fd = sys_dup(fd);
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if (tmp_fd < 0) {
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rv = -EIO; // see above
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goto attr_dir_entrycount_out_no_fd;
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}
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#endif
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while (1) {
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// there's basically no other way to do this (at least none that either i or the internet know of)
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rv = LINUX_SYSCALL(__NR_getdents64, tmp_fd, buf, sizeof(buf));
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if (rv < 0) {
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rv = -EIO; // same as before: avoid confusing our caller with unexepected errnos
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goto attr_dir_entrycount_out;
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} else if (rv == 0) {
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break;
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}
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for (char* iter = buf; iter < buf + rv; iter += ((struct linux_dirent64*)iter)->d_reclen) {
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++(*((uint32_t*)next));
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}
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}
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attr_dir_entrycount_out:
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close_internal(tmp_fd);
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attr_dir_entrycount_out_no_fd:
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next += 4;
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}
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