From: corinna Date: Sun, 20 Aug 2006 12:18:11 +0000 (+0000) Subject: * fhandler_disk_file.cc (DIR_NUM_ENTRIES): Set to 100 to maximize X-Git-Tag: drop_9x_support_start~1910 X-Git-Url: http://git.osdn.net/view?a=commitdiff_plain;h=62b3e521c12cd5a960051e19b1aef314805618d5;p=pf3gnuchains%2Fpf3gnuchains4x.git * 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. --- diff --git a/winsup/cygwin/ChangeLog b/winsup/cygwin/ChangeLog index 12515a8808..dfeaff42db 100644 --- a/winsup/cygwin/ChangeLog +++ b/winsup/cygwin/ChangeLog @@ -1,3 +1,15 @@ +2006-08-20 Corinna Vinschen + + * 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. + 2006-08-20 Hideki Iwamoto * fhandler_disk_file.cc (fhandler_disk_file::pread): Properly check for diff --git a/winsup/cygwin/fhandler_disk_file.cc b/winsup/cygwin/fhandler_disk_file.cc index 6a79d9e77c..a78d98d491 100644 --- a/winsup/cygwin/fhandler_disk_file.cc +++ b/winsup/cygwin/fhandler_disk_file.cc @@ -1468,15 +1468,15 @@ fhandler_disk_file::rmdir () /* This kludge detects if we are attempting to remove the current working directory. If so, we will move elsewhere to potentially allow the - rmdir to succeed. This means that cygwin's concept of the current working - directory != Windows concept but, hey, whaddaregonnado? + rmdir to succeed. This means that cygwin's concept of the current + working directory != Windows concept but, hey, whaddaregonnado? Note that this will not cause something like the following to work: $ cd foo $ rmdir . - since the shell will have foo "open" in the above case and so Windows will - not allow the deletion. (Actually it does on 9X.) - FIXME: A potential workaround for this is for cygwin apps to *never* call - SetCurrentDirectory. */ + since the shell will have foo "open" in the above case and so Windows + will not allow the deletion. (Actually it does on 9X.) + FIXME: A potential workaround for this is for cygwin apps to *never* + call SetCurrentDirectory. */ extern char windows_system_directory[]; if (strcasematch (get_win32_name (), cygheap->cwd.win32) @@ -1514,7 +1514,7 @@ fhandler_disk_file::rmdir () To tune caching, just tweak this number. To get a feeling for the size, the size of the readdir cache is DIR_NUM_ENTRIES * 632 + 264 bytes. */ -#define DIR_NUM_ENTRIES 25 /* Cache size 16064 bytes */ +#define DIR_NUM_ENTRIES 100 /* Cache size 63464 bytes */ #define DIR_BUF_SIZE (DIR_NUM_ENTRIES \ * (sizeof (FILE_ID_BOTH_DIR_INFORMATION) \ @@ -1621,23 +1621,7 @@ fhandler_disk_file::opendir () if (pc.hasgood_inode ()) { dir->__flags |= dirent_set_d_ino; - /* Something weird happens on Samba up to version 3.0.21c, - which is fixed in 3.0.22. FileIdBothDirectoryInformation - seems to work nicely, but only up to the 128th entry in - the directory. After reaching this entry, the next call - to NtQueryDirectoryFile(FileIdBothDirectoryInformation) - returns STATUS_INVALID_LEVEL. Why should we care, we can - just switch to FileBothDirectoryInformation, isn't it? - Nope! The next call to - NtQueryDirectoryFile(FileBothDirectoryInformation) - actually returns STATUS_NO_MORE_FILES, regardless how - many files are left unread in the directory. This does - not happen when using FileBothDirectoryInformation right - from the start. In that case we can read the whole - directory unmolested. So we have to excempt Samba from - the usage of FileIdBothDirectoryInformation entirely, - even though Samba returns valid File IDs. */ - if (wincap.has_fileid_dirinfo () && !pc.fs_is_samba ()) + if (wincap.has_fileid_dirinfo ()) dir->__flags |= dirent_get_d_ino; } } @@ -1790,6 +1774,52 @@ fhandler_disk_file::readdir (DIR *dir, dirent *de) || status == STATUS_INVALID_PARAMETER || status == STATUS_INVALID_INFO_CLASS) dir->__flags &= ~dirent_get_d_ino; + /* Something weird happens on Samba up to version 3.0.21c, which is + fixed in 3.0.22. FileIdBothDirectoryInformation seems to work + nicely, but only up to the 128th entry in the directory. After + reaching this entry, the next call to NtQueryDirectoryFile + (FileIdBothDirectoryInformation) returns STATUS_INVALID_LEVEL. + Why should we care, we can just switch to + FileBothDirectoryInformation, isn't it? Nope! The next call to + NtQueryDirectoryFile(FileBothDirectoryInformation) actually + returns STATUS_NO_MORE_FILES, regardless how many files are left + unread in the directory. This does not happen when using + FileBothDirectoryInformation right from the start, but since + we can't decide whether the server we're talking with has this + bug or not, we end up serving Samba shares always in the slow + mode using FileBothDirectoryInformation. So, what we do here is + to implement the solution suggested by Andrew Tridgell, we just + reread all entries up to dir->d_position using + FileBothDirectoryInformation. + However, We do *not* mark this server as broken and fall back to + using FileBothDirectoryInformation further on. This would slow + down every access to such a server, even for directories under + 128 entries. Also, bigger dirs only suffer from one additional + call per full directory scan, which shouldn't be too big a hit. + This can easily be changed if necessary. */ + if (status == STATUS_INVALID_LEVEL && dir->__d_position) + { + d_cachepos (dir) = 0; + for (int cnt = 0; cnt < dir->__d_position; ++cnt) + { + if (d_cachepos (dir) == 0) + { + status = NtQueryDirectoryFile (dir->__handle, NULL, NULL, + 0, &io, d_cache (dir), DIR_BUF_SIZE, + FileBothDirectoryInformation, + FALSE, NULL, cnt == 0); + if (!NT_SUCCESS (status)) + goto go_ahead; + } + buf = (PFILE_ID_BOTH_DIR_INFORMATION) (d_cache (dir) + + d_cachepos (dir)); + if (buf->NextEntryOffset == 0) + d_cachepos (dir) = 0; + else + d_cachepos (dir) += buf->NextEntryOffset; + } + goto go_ahead; + } } if (!(dir->__flags & dirent_get_d_ino)) status = NtQueryDirectoryFile (dir->__handle, NULL, NULL, 0, &io, @@ -1798,6 +1828,8 @@ fhandler_disk_file::readdir (DIR *dir, dirent *de) FALSE, NULL, dir->__d_position == 0); } +go_ahead: + if (NT_SUCCESS (status)) { buf = (PFILE_ID_BOTH_DIR_INFORMATION) (d_cache (dir) + d_cachepos (dir));