X-Git-Url: http://git.samba.org/?a=blobdiff_plain;f=source%2Fsmbd%2Ffiles.c;h=179963dae9b5250995608386b2dc5b17cb98362f;hb=5c6c8e1fe93;hp=a4837a1a8bc9b0d6704e79b4d4d604d0b9892e68;hpb=0be41d5158ea4e645e93e8cd30617c038416e549;p=samba.git

diff --git a/source/smbd/files.c b/source/smbd/files.c
index a4837a1a8bc..179963dae9b 100644
--- a/source/smbd/files.c
+++ b/source/smbd/files.c
@@ -1,12 +1,11 @@
 /* 
-   Unix SMB/Netbios implementation.
-   Version 1.9.
+   Unix SMB/CIFS implementation.
    Files[] structure handling
    Copyright (C) Andrew Tridgell 1998
    
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
-   the Free Software Foundation; either version 2 of the License, or
+   the Free Software Foundation; either version 3 of the License, or
    (at your option) any later version.
    
    This program is distributed in the hope that it will be useful,
@@ -15,14 +14,11 @@
    GNU General Public License for more details.
    
    You should have received a copy of the GNU General Public License
-   along with this program; if not, write to the Free Software
-   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
 #include "includes.h"
 
-extern int DEBUGLEVEL;
-
 static int real_max_open_files;
 
 #define VALID_FNUM(fnum)   (((fnum) >= 0) && ((fnum) < real_max_open_files))
@@ -35,19 +31,37 @@ static files_struct *Files;
  
 /* a fsp to use when chaining */
 static files_struct *chain_fsp = NULL;
-/* a fsp to use to save when breaking an oplock. */
-static files_struct *oplock_save_chain_fsp = NULL;
 
 static int files_used;
 
+/* A singleton cache to speed up searching by dev/inode. */
+static struct fsp_singleton_cache {
+	files_struct *fsp;
+	struct file_id id;
+} fsp_fi_cache;
+
+/****************************************************************************
+ Return a unique number identifying this fsp over the life of this pid.
+****************************************************************************/
+
+static unsigned long get_gen_count(void)
+{
+	static unsigned long file_gen_counter;
+
+	if ((++file_gen_counter) == 0)
+		return ++file_gen_counter;
+	return file_gen_counter;
+}
+
 /****************************************************************************
-  find first available file slot
+ Find first available file slot.
 ****************************************************************************/
-files_struct *file_new(void )
+
+NTSTATUS file_new(connection_struct *conn, files_struct **result)
 {
 	int i;
 	static int first_file;
-	files_struct *fsp, *next;
+	files_struct *fsp;
 
 	/* we want to give out file handles differently on each new
 	   connection because of a common bug in MS clients where they try to
@@ -58,39 +72,38 @@ files_struct *file_new(void )
 		first_file = (sys_getpid() ^ (int)time(NULL)) % real_max_open_files;
 	}
 
+	/* TODO: Port the id-tree implementation from Samba4 */
+
 	i = bitmap_find(file_bmap, first_file);
 	if (i == -1) {
-		/* 
-		 * Before we give up, go through the open files 
-		 * and see if there are any files opened with a
-		 * batch oplock. If so break the oplock and then
-		 * re-use that entry (if it becomes closed).
-		 * This may help as NT/95 clients tend to keep
-		 * files batch oplocked for quite a long time
-		 * after they have finished with them.
-		 */
-		for (fsp=Files;fsp;fsp=next) {
-			next=fsp->next;
-			if (attempt_close_oplocked_file(fsp)) {
-				return file_new();
-			}
-		}
-
 		DEBUG(0,("ERROR! Out of file structures\n"));
-		unix_ERR_class = ERRSRV;
-		unix_ERR_code = ERRnofids;
-		return NULL;
+		/* TODO: We have to unconditionally return a DOS error here,
+		 * W2k3 even returns ERRDOS/ERRnofids for ntcreate&x with
+		 * NTSTATUS negotiated */
+		return NT_STATUS_TOO_MANY_OPENED_FILES;
 	}
 
-	fsp = (files_struct *)malloc(sizeof(*fsp));
+	fsp = SMB_MALLOC_P(files_struct);
 	if (!fsp) {
-		unix_ERR_class = ERRSRV;
-		unix_ERR_code = ERRnofids;
-		return NULL;
+		return NT_STATUS_NO_MEMORY;
 	}
 
 	ZERO_STRUCTP(fsp);
-	fsp->fd = -1;
+
+	fsp->fh = SMB_MALLOC_P(struct fd_handle);
+	if (!fsp->fh) {
+		SAFE_FREE(fsp);
+		return NT_STATUS_NO_MEMORY;
+	}
+
+	ZERO_STRUCTP(fsp->fh);
+
+	fsp->fh->ref_count = 1;
+	fsp->fh->fd = -1;
+
+	fsp->conn = conn;
+	fsp->fh->gen_id = get_gen_count();
+	GetTimeOfDay(&fsp->open_time);
 
 	first_file = (i+1) % real_max_open_files;
 
@@ -98,6 +111,8 @@ files_struct *file_new(void )
 	files_used++;
 
 	fsp->fnum = i + FILE_HANDLE_OFFSET;
+	SMB_ASSERT(fsp->fnum < 65536);
+
 	string_set(&fsp->fsp_name,"");
 	
 	DLIST_ADD(Files, fsp);
@@ -106,14 +121,20 @@ files_struct *file_new(void )
 		 i, fsp->fnum, files_used));
 
 	chain_fsp = fsp;
-	
-	return fsp;
-}
 
+	/* A new fsp invalidates a negative fsp_fi_cache. */
+	if (fsp_fi_cache.fsp == NULL) {
+		ZERO_STRUCT(fsp_fi_cache);
+	}
+
+	*result = fsp;
+	return NT_STATUS_OK;
+}
 
 /****************************************************************************
-close all open files for a connection
+ Close all open files for a connection.
 ****************************************************************************/
+
 void file_close_conn(connection_struct *conn)
 {
 	files_struct *fsp, *next;
@@ -121,20 +142,36 @@ void file_close_conn(connection_struct *conn)
 	for (fsp=Files;fsp;fsp=next) {
 		next = fsp->next;
 		if (fsp->conn == conn) {
-			close_file(fsp,False); 
+			close_file(fsp,SHUTDOWN_CLOSE); 
 		}
 	}
 }
 
 /****************************************************************************
-initialise file structures
+ Close all open files for a pid and a vuid.
 ****************************************************************************/
 
-#define MAX_OPEN_FUDGEFACTOR 10
+void file_close_pid(uint16 smbpid, int vuid)
+{
+	files_struct *fsp, *next;
+	
+	for (fsp=Files;fsp;fsp=next) {
+		next = fsp->next;
+		if ((fsp->file_pid == smbpid) && (fsp->vuid == vuid)) {
+			close_file(fsp,SHUTDOWN_CLOSE); 
+		}
+	}
+}
+
+/****************************************************************************
+ Initialise file structures.
+****************************************************************************/
+
+#define MAX_OPEN_FUDGEFACTOR 20
 
 void file_init(void)
 {
-        int request_max_open_files = lp_max_open_files();
+	int request_max_open_files = lp_max_open_files();
 	int real_lim;
 
 	/*
@@ -146,11 +183,16 @@ void file_init(void)
 
 	real_max_open_files = real_lim - MAX_OPEN_FUDGEFACTOR;
 
-        if(real_max_open_files != request_max_open_files) {
-        	DEBUG(1,("file_init: Information only: requested %d \
+	if (real_max_open_files + FILE_HANDLE_OFFSET + MAX_OPEN_PIPES > 65536)
+		real_max_open_files = 65536 - FILE_HANDLE_OFFSET - MAX_OPEN_PIPES;
+
+	if(real_max_open_files != request_max_open_files) {
+		DEBUG(1,("file_init: Information only: requested %d \
 open files, %d are available.\n", request_max_open_files, real_max_open_files));
 	}
 
+	SMB_ASSERT(real_max_open_files > 100);
+
 	file_bmap = bitmap_allocate(real_max_open_files);
 	
 	if (!file_bmap) {
@@ -163,10 +205,10 @@ open files, %d are available.\n", request_max_open_files, real_max_open_files));
 	set_pipe_handle_offset(real_max_open_files);
 }
 
-
 /****************************************************************************
-close files open by a specified vuid
+ Close files open by a specified vuid.
 ****************************************************************************/
+
 void file_close_user(int vuid)
 {
 	files_struct *fsp, *next;
@@ -174,31 +216,75 @@ void file_close_user(int vuid)
 	for (fsp=Files;fsp;fsp=next) {
 		next=fsp->next;
 		if (fsp->vuid == vuid) {
-			close_file(fsp,False);
+			close_file(fsp,SHUTDOWN_CLOSE);
 		}
 	}
 }
 
+/****************************************************************************
+ Debug to enumerate all open files in the smbd.
+****************************************************************************/
+
+void file_dump_open_table(void)
+{
+	int count=0;
+	files_struct *fsp;
+
+	for (fsp=Files;fsp;fsp=fsp->next,count++) {
+		DEBUG(10,("Files[%d], fnum = %d, name %s, fd = %d, gen = %lu, fileid=%s\n",
+			count, fsp->fnum, fsp->fsp_name, fsp->fh->fd, (unsigned long)fsp->fh->gen_id,
+			  file_id_string_tos(&fsp->file_id)));
+	}
+}
+
+/****************************************************************************
+ Find a fsp given a file descriptor.
+****************************************************************************/
+
+files_struct *file_find_fd(int fd)
+{
+	int count=0;
+	files_struct *fsp;
+
+	for (fsp=Files;fsp;fsp=fsp->next,count++) {
+		if (fsp->fh->fd == fd) {
+			if (count > 10) {
+				DLIST_PROMOTE(Files, fsp);
+			}
+			return fsp;
+		}
+	}
+
+	return NULL;
+}
 
 /****************************************************************************
- Find a fsp given a device, inode and timevalue
- If this is from a kernel oplock break request then tval may be NULL.
+ Find a fsp given a device, inode and file_id.
 ****************************************************************************/
 
-files_struct *file_find_dit(SMB_DEV_T dev, SMB_INO_T inode, struct timeval *tval)
+files_struct *file_find_dif(struct file_id id, unsigned long gen_id)
 {
 	int count=0;
 	files_struct *fsp;
 
 	for (fsp=Files;fsp;fsp=fsp->next,count++) {
-		if (fsp->fd != -1 &&
-		    fsp->dev == dev && 
-		    fsp->inode == inode &&
-		    (tval ? (fsp->open_time.tv_sec == tval->tv_sec) : True ) &&
-		    (tval ? (fsp->open_time.tv_usec == tval->tv_usec) : True )) {
+		/* We can have a fsp->fh->fd == -1 here as it could be a stat open. */
+		if (file_id_equal(&fsp->file_id, &id) &&
+		    fsp->fh->gen_id == gen_id ) {
 			if (count > 10) {
 				DLIST_PROMOTE(Files, fsp);
 			}
+			/* Paranoia check. */
+			if ((fsp->fh->fd == -1) &&
+			    (fsp->oplock_type != NO_OPLOCK) &&
+			    (fsp->oplock_type != FAKE_LEVEL_II_OPLOCK)) {
+				DEBUG(0,("file_find_dif: file %s file_id = %s, gen = %u \
+oplock_type = %u is a stat open with oplock type !\n", fsp->fsp_name, 
+					 file_id_string_tos(&fsp->file_id),
+					 (unsigned int)fsp->fh->gen_id,
+					 (unsigned int)fsp->oplock_type ));
+				smb_panic("file_find_dif");
+			}
 			return fsp;
 		}
 	}
@@ -214,30 +300,43 @@ files_struct *file_find_fsp(files_struct *orig_fsp)
 {
 	files_struct *fsp;
 
-    for (fsp=Files;fsp;fsp=fsp->next) {
-        if (fsp == orig_fsp)
-            return fsp;
-    }
+	for (fsp=Files;fsp;fsp=fsp->next) {
+		if (fsp == orig_fsp)
+			return fsp;
+	}
 
-    return NULL;
+	return NULL;
 }
 
 /****************************************************************************
  Find the first fsp given a device and inode.
+ We use a singleton cache here to speed up searching from getfilepathinfo
+ calls.
 ****************************************************************************/
 
-files_struct *file_find_di_first(SMB_DEV_T dev, SMB_INO_T inode)
+files_struct *file_find_di_first(struct file_id id)
 {
-    files_struct *fsp;
+	files_struct *fsp;
 
-    for (fsp=Files;fsp;fsp=fsp->next) {
-        if ( fsp->fd != -1 &&
-            fsp->dev == dev &&
-            fsp->inode == inode )
-            return fsp;
-    }
+	if (file_id_equal(&fsp_fi_cache.id, &id)) {
+		/* Positive or negative cache hit. */
+		return fsp_fi_cache.fsp;
+	}
+
+	fsp_fi_cache.id = id;
 
-    return NULL;
+	for (fsp=Files;fsp;fsp=fsp->next) {
+		if ( fsp->fh->fd != -1 &&
+		     file_id_equal(&fsp->file_id, &id)) {
+			/* Setup positive cache. */
+			fsp_fi_cache.fsp = fsp;
+			return fsp;
+		}
+	}
+
+	/* Setup negative cache. */
+	fsp_fi_cache.fsp = NULL;
+	return NULL;
 }
 
 /****************************************************************************
@@ -246,58 +345,102 @@ files_struct *file_find_di_first(SMB_DEV_T dev, SMB_INO_T inode)
 
 files_struct *file_find_di_next(files_struct *start_fsp)
 {
-    files_struct *fsp;
+	files_struct *fsp;
 
-    for (fsp = start_fsp->next;fsp;fsp=fsp->next) {
-        if ( fsp->fd != -1 &&
-            fsp->dev == start_fsp->dev &&
-            fsp->inode == start_fsp->inode )
-            return fsp;
-    }
+	for (fsp = start_fsp->next;fsp;fsp=fsp->next) {
+		if ( fsp->fh->fd != -1 &&
+		     file_id_equal(&fsp->file_id, &start_fsp->file_id)) {
+			return fsp;
+		}
+	}
 
-    return NULL;
+	return NULL;
 }
 
 /****************************************************************************
-find a fsp that is open for printing
+ Find a fsp that is open for printing.
 ****************************************************************************/
+
 files_struct *file_find_print(void)
 {
 	files_struct *fsp;
 
 	for (fsp=Files;fsp;fsp=fsp->next) {
-		if (fsp->print_file) return fsp;
+		if (fsp->print_file) {
+			return fsp;
+		}
 	} 
 
 	return NULL;
 }
 
+/****************************************************************************
+ Set a pending modtime across all files with a given dev/ino pair.
+ Record the owner of that modtime.
+****************************************************************************/
+
+void fsp_set_pending_modtime(files_struct *tfsp, const struct timespec mod)
+{
+	files_struct *fsp;
+
+	if (null_timespec(mod)) {
+		return;
+	}
+
+	for (fsp = Files;fsp;fsp=fsp->next) {
+		if ( fsp->fh->fd != -1 && file_id_equal(&fsp->file_id, &tfsp->file_id)) {
+			fsp->pending_modtime = mod;
+			fsp->pending_modtime_owner = False;
+		}
+	}
+
+	tfsp->pending_modtime_owner = True;
+}
 
 /****************************************************************************
-sync open files on a connection
+ Sync open files on a connection.
 ****************************************************************************/
+
 void file_sync_all(connection_struct *conn)
 {
 	files_struct *fsp, *next;
 
 	for (fsp=Files;fsp;fsp=next) {
 		next=fsp->next;
-		if ((conn == fsp->conn) && (fsp->fd != -1)) {
-			sync_file(conn,fsp);
+		if ((conn == fsp->conn) && (fsp->fh->fd != -1)) {
+			sync_file(conn, fsp, True /* write through */);
 		}
 	}
 }
 
-
 /****************************************************************************
-free up a fsp
+ Free up a fsp.
 ****************************************************************************/
+
 void file_free(files_struct *fsp)
 {
 	DLIST_REMOVE(Files, fsp);
 
 	string_free(&fsp->fsp_name);
 
+	if (fsp->fake_file_handle) {
+		destroy_fake_file_handle(&fsp->fake_file_handle);
+	}
+
+	if (fsp->fh->ref_count == 1) {
+		SAFE_FREE(fsp->fh);
+	} else {
+		fsp->fh->ref_count--;
+	}
+
+	if (fsp->notify) {
+		notify_remove(fsp->conn->notify_ctx, fsp);
+		TALLOC_FREE(fsp->notify);
+	}
+
+	/* Ensure this event will never fire. */
+	TALLOC_FREE(fsp->oplock_timeout);
+
 	bitmap_clear(file_bmap, fsp->fnum - FILE_HANDLE_OFFSET);
 	files_used--;
 
@@ -308,27 +451,29 @@ void file_free(files_struct *fsp)
 	   information */
 	ZERO_STRUCTP(fsp);
 
-	if (fsp == chain_fsp) chain_fsp = NULL;
+	if (fsp == chain_fsp) {
+		chain_fsp = NULL;
+	}
 
-	free(fsp);
-}
+	/* Closing a file can invalidate the positive cache. */
+	if (fsp == fsp_fi_cache.fsp) {
+		ZERO_STRUCT(fsp_fi_cache);
+	}
 
+	SAFE_FREE(fsp);
+}
 
 /****************************************************************************
-get a fsp from a packet given the offset of a 16 bit fnum
+ Get an fsp from a 16 bit fnum.
 ****************************************************************************/
-files_struct *file_fsp(char *buf, int where)
+
+files_struct *file_fnum(uint16 fnum)
 {
-	int fnum, count=0;
 	files_struct *fsp;
-
-	if (chain_fsp) return chain_fsp;
-
-	fnum = SVAL(buf, where);
+	int count=0;
 
 	for (fsp=Files;fsp;fsp=fsp->next, count++) {
 		if (fsp->fnum == fnum) {
-			chain_fsp = fsp;
 			if (count > 10) {
 				DLIST_PROMOTE(Files, fsp);
 			}
@@ -339,27 +484,83 @@ files_struct *file_fsp(char *buf, int where)
 }
 
 /****************************************************************************
- Reset the chained fsp - done at the start of a packet reply
+ Get an fsp from a packet given the offset of a 16 bit fnum.
 ****************************************************************************/
 
-void file_chain_reset(void)
+files_struct *file_fsp(uint16 fid)
 {
-	chain_fsp = NULL;
+	files_struct *fsp;
+
+	if (chain_fsp) {
+		return chain_fsp;
+	}
+
+	fsp = file_fnum(fid);
+	if (fsp) {
+		chain_fsp = fsp;
+	}
+	return fsp;
 }
 
 /****************************************************************************
-Save the chained fsp - done when about to do an oplock break.
+ Reset the chained fsp - done at the start of a packet reply.
 ****************************************************************************/
 
-void file_chain_save(void)
+void file_chain_reset(void)
 {
-	oplock_save_chain_fsp = chain_fsp;
+	chain_fsp = NULL;
 }
 
 /****************************************************************************
-Restore the chained fsp - done after an oplock break.
+ Duplicate the file handle part for a DOS or FCB open.
 ****************************************************************************/
-void file_chain_restore(void)
+
+NTSTATUS dup_file_fsp(files_struct *fsp,
+				uint32 access_mask,
+				uint32 share_access,
+				uint32 create_options,
+		      		files_struct **result)
 {
-	chain_fsp = oplock_save_chain_fsp;
+	NTSTATUS status;
+	files_struct *dup_fsp;
+
+	status = file_new(fsp->conn, &dup_fsp);
+
+	if (!NT_STATUS_IS_OK(status)) {
+		return status;
+	}
+
+	SAFE_FREE(dup_fsp->fh);
+
+	dup_fsp->fh = fsp->fh;
+	dup_fsp->fh->ref_count++;
+
+	dup_fsp->file_id = fsp->file_id;
+	dup_fsp->initial_allocation_size = fsp->initial_allocation_size;
+	dup_fsp->mode = fsp->mode;
+	dup_fsp->file_pid = fsp->file_pid;
+	dup_fsp->vuid = fsp->vuid;
+	dup_fsp->open_time = fsp->open_time;
+	dup_fsp->access_mask = access_mask;
+	dup_fsp->share_access = share_access;
+	dup_fsp->pending_modtime_owner = fsp->pending_modtime_owner;
+	dup_fsp->pending_modtime = fsp->pending_modtime;
+	dup_fsp->last_write_time = fsp->last_write_time;
+	dup_fsp->oplock_type = fsp->oplock_type;
+	dup_fsp->can_lock = fsp->can_lock;
+	dup_fsp->can_read = (access_mask & (FILE_READ_DATA)) ? True : False;
+	if (!CAN_WRITE(fsp->conn)) {
+		dup_fsp->can_write = False;
+	} else {
+		dup_fsp->can_write = (access_mask & (FILE_WRITE_DATA | FILE_APPEND_DATA)) ? True : False;
+	}
+	dup_fsp->print_file = fsp->print_file;
+	dup_fsp->modified = fsp->modified;
+	dup_fsp->is_directory = fsp->is_directory;
+	dup_fsp->is_stat = fsp->is_stat;
+	dup_fsp->aio_write_behind = fsp->aio_write_behind;
+        string_set(&dup_fsp->fsp_name,fsp->fsp_name);
+
+	*result = dup_fsp;
+	return NT_STATUS_OK;
 }