* fhandler_disk_file.cc (DIR_NUM_ENTRIES): Set to 100 to maximize
performance on remote shares. (fhandler_disk_file::opendir): Move comment about Samba weirdness into fhandler_disk_file::readdir. Don't disallow FileIdBothDirectoryInformation on Samba. (fhandler_disk_file::readdir): Workaround Samba problem with FileIdBothDirectoryInformation by rereading already read entries using FileBothDirectoryInformation. Change comment about Samba weirdness explaining this change.
This commit is contained in:
Corinna Vinschen
parent
ffa6849093
commit
b0662a051b
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@ -1,3 +1,15 @@
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2006-08-20 Corinna Vinschen <corinna@vinschen.de>
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* fhandler_disk_file.cc (DIR_NUM_ENTRIES): Set to 100 to maximize
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performance on remote shares.
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(fhandler_disk_file::opendir): Move comment about Samba weirdness into
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fhandler_disk_file::readdir. Don't disallow
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FileIdBothDirectoryInformation on Samba.
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(fhandler_disk_file::readdir): Workaround Samba problem with
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FileIdBothDirectoryInformation by rereading already read entries
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using FileBothDirectoryInformation. Change comment about Samba
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weirdness explaining this change.
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2006-08-20 Hideki Iwamoto <h-iwamoto@kit.hi-ho.ne.jp>
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* fhandler_disk_file.cc (fhandler_disk_file::pread): Properly check for
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@ -1468,15 +1468,15 @@ fhandler_disk_file::rmdir ()
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/* This kludge detects if we are attempting to remove the current working
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directory. If so, we will move elsewhere to potentially allow the
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rmdir to succeed. This means that cygwin's concept of the current working
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directory != Windows concept but, hey, whaddaregonnado?
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rmdir to succeed. This means that cygwin's concept of the current
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working directory != Windows concept but, hey, whaddaregonnado?
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Note that this will not cause something like the following to work:
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$ cd foo
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$ rmdir .
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since the shell will have foo "open" in the above case and so Windows will
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not allow the deletion. (Actually it does on 9X.)
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FIXME: A potential workaround for this is for cygwin apps to *never* call
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SetCurrentDirectory. */
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since the shell will have foo "open" in the above case and so Windows
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will not allow the deletion. (Actually it does on 9X.)
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FIXME: A potential workaround for this is for cygwin apps to *never*
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call SetCurrentDirectory. */
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extern char windows_system_directory[];
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if (strcasematch (get_win32_name (), cygheap->cwd.win32)
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@ -1514,7 +1514,7 @@ fhandler_disk_file::rmdir ()
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To tune caching, just tweak this number. To get a feeling for the size,
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the size of the readdir cache is DIR_NUM_ENTRIES * 632 + 264 bytes. */
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#define DIR_NUM_ENTRIES 25 /* Cache size 16064 bytes */
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#define DIR_NUM_ENTRIES 100 /* Cache size 63464 bytes */
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#define DIR_BUF_SIZE (DIR_NUM_ENTRIES \
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* (sizeof (FILE_ID_BOTH_DIR_INFORMATION) \
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@ -1621,23 +1621,7 @@ fhandler_disk_file::opendir ()
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if (pc.hasgood_inode ())
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{
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dir->__flags |= dirent_set_d_ino;
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/* Something weird happens on Samba up to version 3.0.21c,
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which is fixed in 3.0.22. FileIdBothDirectoryInformation
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seems to work nicely, but only up to the 128th entry in
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the directory. After reaching this entry, the next call
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to NtQueryDirectoryFile(FileIdBothDirectoryInformation)
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returns STATUS_INVALID_LEVEL. Why should we care, we can
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just switch to FileBothDirectoryInformation, isn't it?
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Nope! The next call to
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NtQueryDirectoryFile(FileBothDirectoryInformation)
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actually returns STATUS_NO_MORE_FILES, regardless how
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many files are left unread in the directory. This does
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not happen when using FileBothDirectoryInformation right
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from the start. In that case we can read the whole
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directory unmolested. So we have to excempt Samba from
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the usage of FileIdBothDirectoryInformation entirely,
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even though Samba returns valid File IDs. */
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if (wincap.has_fileid_dirinfo () && !pc.fs_is_samba ())
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if (wincap.has_fileid_dirinfo ())
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dir->__flags |= dirent_get_d_ino;
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}
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}
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@ -1790,6 +1774,52 @@ fhandler_disk_file::readdir (DIR *dir, dirent *de)
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|| status == STATUS_INVALID_PARAMETER
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|| status == STATUS_INVALID_INFO_CLASS)
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dir->__flags &= ~dirent_get_d_ino;
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/* Something weird happens on Samba up to version 3.0.21c, which is
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fixed in 3.0.22. FileIdBothDirectoryInformation seems to work
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nicely, but only up to the 128th entry in the directory. After
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reaching this entry, the next call to NtQueryDirectoryFile
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(FileIdBothDirectoryInformation) returns STATUS_INVALID_LEVEL.
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Why should we care, we can just switch to
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FileBothDirectoryInformation, isn't it? Nope! The next call to
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NtQueryDirectoryFile(FileBothDirectoryInformation) actually
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returns STATUS_NO_MORE_FILES, regardless how many files are left
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unread in the directory. This does not happen when using
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FileBothDirectoryInformation right from the start, but since
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we can't decide whether the server we're talking with has this
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bug or not, we end up serving Samba shares always in the slow
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mode using FileBothDirectoryInformation. So, what we do here is
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to implement the solution suggested by Andrew Tridgell, we just
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reread all entries up to dir->d_position using
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FileBothDirectoryInformation.
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However, We do *not* mark this server as broken and fall back to
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using FileBothDirectoryInformation further on. This would slow
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down every access to such a server, even for directories under
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128 entries. Also, bigger dirs only suffer from one additional
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call per full directory scan, which shouldn't be too big a hit.
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This can easily be changed if necessary. */
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if (status == STATUS_INVALID_LEVEL && dir->__d_position)
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{
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d_cachepos (dir) = 0;
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for (int cnt = 0; cnt < dir->__d_position; ++cnt)
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{
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if (d_cachepos (dir) == 0)
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{
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status = NtQueryDirectoryFile (dir->__handle, NULL, NULL,
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0, &io, d_cache (dir), DIR_BUF_SIZE,
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FileBothDirectoryInformation,
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FALSE, NULL, cnt == 0);
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if (!NT_SUCCESS (status))
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goto go_ahead;
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}
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buf = (PFILE_ID_BOTH_DIR_INFORMATION) (d_cache (dir)
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+ d_cachepos (dir));
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if (buf->NextEntryOffset == 0)
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d_cachepos (dir) = 0;
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else
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d_cachepos (dir) += buf->NextEntryOffset;
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}
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goto go_ahead;
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}
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}
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if (!(dir->__flags & dirent_get_d_ino))
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status = NtQueryDirectoryFile (dir->__handle, NULL, NULL, 0, &io,
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@ -1798,6 +1828,8 @@ fhandler_disk_file::readdir (DIR *dir, dirent *de)
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FALSE, NULL, dir->__d_position == 0);
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}
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go_ahead:
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if (NT_SUCCESS (status))
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{
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buf = (PFILE_ID_BOTH_DIR_INFORMATION) (d_cache (dir) + d_cachepos (dir));
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