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* increased the size of tdirent to

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a) compensate for the fact that the kernel assumes it's a multiple of 8
      bytes
   b) reduce the number of system calls we have to perform when walking a
      directory
  (fixes mantis #24885 and probably also #20125 and #23732)

git-svn-id: trunk@26150 -
This commit is contained in:
Jonas Maebe 2013-11-27 22:57:17 +00:00
parent 679c6bd27e
commit 5b58162d6b
1 changed files with 13 additions and 1 deletions
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14
rtl/linux/ostypes.inc
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@ -89,13 +89,25 @@ type
PStat = ^Stat;
{ directory services }
{ the Dirent type for getdents64 is no longer declared as ending with
an array 0..255, but as ending with a variable-sized array. While the
maximum file name length hasn't changed, the getdents64 system call
code does always check whether the size of the struct is a multiple
of 8 bytes. On platforms where the maximum alignment is 4 bytes, the
size of the Dirent struct ending with an array of 256 chars is
however only 276 bytes. As a result, getdents64 fails for long file
names with that Dirent size.
Rather than slightly increasing the size to 280 bytes, immediately
make it much larger so that the kernel can cache more entries per
system call and as a result we have to perform less system calls.
}
Dirent = record
d_fileno : ino64_t; // file number of entry
d_off : off_t;
d_reclen : cushort; // length of string in d_name
d_type : cuchar; // file type, see below
d_name : array[0..(255 + 1)-1] of char; // name must be no longer than this
d_name : array[0..4095-sizeof(ino64_t)-sizeof(off_t)-sizeof(cushort)-sizeof(cuchar)] of char; // name buffer + padding for extra records; align total record size to a page size
end;
TDirent = Dirent;
pDirent = ^Dirent;