* syscalls.cc (start_transaction): Make inline function. Move up to be
more generally available. (stop_transaction): Ditto. (unlink_nt): Potentially start transaction when trying to delete file with DOS R/O attribute set. If file is .lnk symlink, check for number of hardlinks. Add "out" label and only return via "out". Rearrange reversion of DOS R/O attribute and, on success, only revert R/O attribute if file is .lnk symlink with more than one hardlink. Add length comment to explain why.
This commit is contained in:
Corinna Vinschen
parent
2981e56e29
commit
18df393573
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@ -1,3 +1,15 @@
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2010-09-12 Corinna Vinschen <corinna@vinschen.de>
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* syscalls.cc (start_transaction): Make inline function. Move up to be
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more generally available.
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(stop_transaction): Ditto.
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(unlink_nt): Potentially start transaction when trying to delete file
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with DOS R/O attribute set. If file is .lnk symlink, check for number
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of hardlinks. Add "out" label and only return via "out". Rearrange
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reversion of DOS R/O attribute and, on success, only revert R/O
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attribute if file is .lnk symlink with more than one hardlink. Add
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length comment to explain why.
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2010-09-11 Corinna Vinschen <corinna@vinschen.de>
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* fhandler_disk_file.cc (fhandler_disk_file::rmdir): More thoroughly
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@ -164,6 +164,36 @@ dup3 (int oldfd, int newfd, int flags)
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return cygheap->fdtab.dup3 (oldfd, newfd, flags);
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}
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static inline void
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start_transaction (HANDLE &old_trans, HANDLE &trans)
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{
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NTSTATUS status = NtCreateTransaction (&trans,
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SYNCHRONIZE | TRANSACTION_ALL_ACCESS,
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NULL, NULL, NULL, 0, 0, 0, NULL, NULL);
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if (NT_SUCCESS (status))
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{
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old_trans = RtlGetCurrentTransaction ();
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RtlSetCurrentTransaction (trans);
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}
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else
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{
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debug_printf ("NtCreateTransaction failed, %p", status);
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old_trans = trans = NULL;
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}
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}
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static inline NTSTATUS
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stop_transaction (NTSTATUS status, HANDLE old_trans, HANDLE trans)
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{
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RtlSetCurrentTransaction (old_trans);
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if (NT_SUCCESS (status))
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status = NtCommitTransaction (trans, TRUE);
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else
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status = NtRollbackTransaction (trans, TRUE);
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NtClose (trans);
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return status;
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}
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static char desktop_ini[] =
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"[.ShellClassInfo]\r\nCLSID={645FF040-5081-101B-9F08-00AA002F954E}\r\n";
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static BYTE info2[] =
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@ -503,6 +533,9 @@ unlink_nt (path_conv &pc)
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HANDLE fh, fh_ro = NULL;
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OBJECT_ATTRIBUTES attr;
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IO_STATUS_BLOCK io;
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HANDLE old_trans = NULL, trans = NULL;
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ULONG num_links = 1;
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FILE_DISPOSITION_INFORMATION disp = { TRUE };
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bin_status bin_stat = dont_move;
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@ -522,7 +555,14 @@ unlink_nt (path_conv &pc)
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attribute, just re-open the file for DELETE and go ahead. */
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if (pc.file_attributes () & FILE_ATTRIBUTE_READONLY)
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{
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access |= FILE_WRITE_ATTRIBUTES;
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FILE_STANDARD_INFORMATION fsi;
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/* If possible, hide the non-atomicity of the "remove R/O flag, remove
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link to file" operation behind a transaction. */
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if (wincap.has_transactions ()
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&& (pc.fs_flags () & FILE_SUPPORTS_TRANSACTIONS))
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start_transaction (old_trans, trans);
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status = NtOpenFile (&fh_ro, FILE_WRITE_ATTRIBUTES, &attr, &io,
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FILE_SHARE_VALID_FLAGS, flags);
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if (NT_SUCCESS (status))
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@ -532,6 +572,14 @@ unlink_nt (path_conv &pc)
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InitializeObjectAttributes (&attr, &ro_u_empty,
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pc.objcaseinsensitive (), fh_ro, NULL);
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}
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if (pc.is_lnk_symlink ())
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{
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status = NtQueryInformationFile (fh_ro, &io, &fsi, sizeof fsi,
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FileStandardInformation);
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if (NT_SUCCESS (status))
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num_links = fsi.NumberOfLinks;
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}
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access |= FILE_WRITE_ATTRIBUTES;
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}
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/* First try to open the file with only allowing sharing for delete. If
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the file has an open handle on it, other than just for deletion, this
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@ -589,7 +637,7 @@ unlink_nt (path_conv &pc)
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NtClose (fh);
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if (fh_ro)
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NtClose (fh_ro);
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return status;
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goto out;
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}
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}
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}
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@ -601,18 +649,21 @@ unlink_nt (path_conv &pc)
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if (status == STATUS_DELETE_PENDING)
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{
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syscall_printf ("Delete already pending");
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return 0;
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status = 0;
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goto out;
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}
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syscall_printf ("Opening file for delete failed, status = %p", status);
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return status;
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goto out;
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}
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/* Try to move to bin if a sharing violation occured. If that worked,
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we're done. */
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if (bin_stat == move_to_bin
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&& (bin_stat = try_to_bin (pc, fh, access)) == has_been_moved)
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return 0;
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{
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status = 0;
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goto out;
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}
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/* Try to set delete disposition. */
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FILE_DISPOSITION_INFORMATION disp = { TRUE };
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status = NtSetInformationFile (fh, &io, &disp, sizeof disp,
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FileDispositionInformation);
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if (!NT_SUCCESS (status))
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@ -661,14 +712,36 @@ unlink_nt (path_conv &pc)
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}
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if (fh)
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{
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/* Restore R/O attribute to accommodate hardlinks. Don't try this
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with directories! For some reason the below NtSetInformationFile
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changes the delete disposition back to FALSE, at least on XP. */
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if ((access & FILE_WRITE_ATTRIBUTES)
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&& (!NT_SUCCESS (status) || !pc.isdir ()))
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NtSetAttributesFile (fh, pc.file_attributes ());
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if (access & FILE_WRITE_ATTRIBUTES)
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{
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/* Restore R/O attribute if setting the delete dispostion failed. */
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if (!NT_SUCCESS (status))
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NtSetAttributesFile (fh, pc.file_attributes ());
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/* If we succeeded, restore R/O attribute to accommodate hardlinks.
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Only ever try to do this for our own winsymlinks, because there's
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a problem with setting the delete disposition:
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http://msdn.microsoft.com/en-us/library/ff545765%28VS.85%29.aspx
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"Subsequently, the only legal operation by such a caller is
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to close the open file handle."
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FIXME? On Vista and later, we could use FILE_HARD_LINK_INFORMATION
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to find all hardlinks and use one of them to restore the R/O bit,
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after the NtClose, but before we stop the transaction. This
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avoids the aforementioned problem entirely . */
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else if (pc.is_lnk_symlink () && num_links > 1)
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NtSetAttributesFile (fh, pc.file_attributes ());
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}
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NtClose (fh);
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}
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out:
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/* Stop transaction if we started one. */
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if ((access & FILE_WRITE_ATTRIBUTES)
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&& wincap.has_transactions ()
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&& (pc.fs_flags () & FILE_SUPPORTS_TRANSACTIONS))
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stop_transaction (status, old_trans, trans);
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return status;
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}
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@ -1658,36 +1731,6 @@ rename_append_suffix (path_conv &pc, const char *path, size_t len,
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pc.check (buf, PC_SYM_NOFOLLOW);
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}
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static void
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start_transaction (HANDLE &old_trans, HANDLE &trans)
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{
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NTSTATUS status = NtCreateTransaction (&trans,
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SYNCHRONIZE | TRANSACTION_ALL_ACCESS,
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NULL, NULL, NULL, 0, 0, 0, NULL, NULL);
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if (NT_SUCCESS (status))
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{
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old_trans = RtlGetCurrentTransaction ();
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RtlSetCurrentTransaction (trans);
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}
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else
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{
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debug_printf ("NtCreateTransaction failed, %p", status);
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old_trans = trans = NULL;
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}
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}
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static NTSTATUS
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stop_transaction (NTSTATUS status, HANDLE old_trans, HANDLE trans)
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{
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RtlSetCurrentTransaction (old_trans);
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if (NT_SUCCESS (status))
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status = NtCommitTransaction (trans, TRUE);
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else
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status = NtRollbackTransaction (trans, TRUE);
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NtClose (trans);
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return status;
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}
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/* This function tests if a filename has one of the "approved" executable
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suffix. This list is probably not complete... */
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static inline bool
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