Joel Holdsworth : server: Replace unlink member of closed_fd with disp_flags.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: f10383e9d0ff7de7dca0b21efef02f416a0955b4
URL:    https://gitlab.winehq.org/wine/wine/-/commit/f10383e9d0ff7de7dca0b21efef02f4...

Author: Joel Holdsworth 
Date:   Tue Jun 20 11:54:36 2023 +0100

server: Replace unlink member of closed_fd with disp_flags.

In order to implement FILE_DISPOSITION_POSIX_SEMANTICS, it will be necessary
to add additional flags to closed_fd. In preparation for this, the unlink
member variable has been replaced with disp_flags which directly reflects the
flags defined in the FILE_DISPOSITION_INFORMATION_EX structure.

Signed-off-by: Joel Holdsworth

---

server/fd.c | 33 ++++++++++++++++++---------------
 1 file changed, 18 insertions(+), 15 deletions(-)

diff --git a/server/fd.c b/server/fd.c
index dc35999c3f3..6ce3343fb6f 100644
--- a/server/fd.c
+++ b/server/fd.c
@@ -160,10 +160,10 @@ static inline int epoll_wait( int epfd, struct epoll_event *events, int maxevent
 /* closed_fd is used to keep track of the unix fd belonging to a closed fd object */
 struct closed_fd
 {
-    struct list entry;       /* entry in inode closed list */
-    int         unix_fd;     /* the unix file descriptor */
-    int         unlink;      /* whether to unlink on close: -1 - implicit FILE_DELETE_ON_CLOSE, 1 - explicit disposition */
-    char       *unix_name;   /* name to unlink on close, points to parent fd unix_name */
+    struct list     entry;      /* entry in inode closed list */
+    int             unix_fd;    /* the unix file descriptor */
+    unsigned int    disp_flags; /* the disposition flags */
+    char           *unix_name;  /* name to unlink on close, points to parent fd unix_name */
 };

struct fd
@@ -1122,7 +1122,9 @@ static void inode_close_pending( struct inode *inode, int keep_unlinks )
             close( fd->unix_fd );
             fd->unix_fd = -1;
         }
-        if (!keep_unlinks || !fd->unlink)  /* get rid of it unless there's an unlink pending on that file */
+
+        /* get rid of it unless there's an unlink pending on that file */
+        if (!keep_unlinks || !(fd->disp_flags & FILE_DISPOSITION_DELETE))
         {
             list_remove( ptr );
             free( fd->unix_name );
@@ -1155,7 +1157,7 @@ static void inode_destroy( struct object *obj )
         struct closed_fd *fd = LIST_ENTRY( ptr, struct closed_fd, entry );
         list_remove( ptr );
         if (fd->unix_fd != -1) close( fd->unix_fd );
-        if (fd->unlink)
+        if (fd->disp_flags & FILE_DISPOSITION_DELETE)
         {
             /* make sure it is still the same file */
             struct stat st;
@@ -1211,8 +1213,9 @@ static void inode_add_closed_fd( struct inode *inode, struct closed_fd *fd )
     {
         list_add_head( &inode->closed, &fd->entry );
     }
-    else if (fd->unlink)  /* close the fd but keep the structure around for unlink */
+    else if (fd->disp_flags & FILE_DISPOSITION_ON_CLOSE)
     {
+        /* close the fd but keep the structure around for unlink */
         if (fd->unix_fd != -1) close( fd->unix_fd );
         fd->unix_fd = -1;
         list_add_head( &inode->closed, &fd->entry );
@@ -1560,7 +1563,7 @@ static void fd_dump( struct object *obj, int verbose )
 {
     struct fd *fd = (struct fd *)obj;
     fprintf( stderr, "Fd unix_fd=%d user=%p options=%08x", fd->unix_fd, fd->user, fd->options );
-    if (fd->inode) fprintf( stderr, " inode=%p unlink=%d", fd->inode, fd->closed->unlink );
+    if (fd->inode) fprintf( stderr, " inode=%p disp_flags=%x", fd->inode, fd->closed->disp_flags );
     fprintf( stderr, "\n" );
 }

@@ -1673,7 +1676,7 @@ static inline void unmount_fd( struct fd *fd )
     fd->unix_fd = -1;
     fd->no_fd_status = STATUS_VOLUME_DISMOUNTED;
     fd->closed->unix_fd = -1;
-    fd->closed->unlink = 0;
+    fd->closed->disp_flags = 0;

/* stop using Unix locks on this fd (existing locks have been removed by close) */
     fd->fs_locks = 0;
@@ -1783,7 +1786,7 @@ struct fd *dup_fd_object( struct fd *orig, unsigned int access, unsigned int sha
             goto failed;
         }
         closed->unix_fd = fd->unix_fd;
-        closed->unlink = 0;
+        closed->disp_flags = 0;
         closed->unix_name = fd->unix_name;
         fd->closed = closed;
         fd->inode = (struct inode *)grab_object( orig->inode );
@@ -1977,7 +1980,7 @@ struct fd *open_fd( struct fd *root, const char *name, struct unicode_str nt_nam
     }

closed_fd->unix_fd = fd->unix_fd;
-    closed_fd->unlink = 0;
+    closed_fd->disp_flags = 0;
     closed_fd->unix_name = fd->unix_name;
     fstat( fd->unix_fd, &st );
     *mode = st.st_mode;
@@ -2026,7 +2029,8 @@ struct fd *open_fd( struct fd *root, const char *name, struct unicode_str nt_nam
             goto error;
         }

-        fd->closed->unlink = (options & FILE_DELETE_ON_CLOSE) ? -1 : 0;
+        fd->closed->disp_flags = (options & FILE_DELETE_ON_CLOSE) ?
+            FILE_DISPOSITION_DELETE : 0;
         if (flags & O_TRUNC)
         {
             if (S_ISDIR(st.st_mode))
@@ -2528,9 +2532,8 @@ static void set_fd_disposition( struct fd *fd, unsigned int flags )
     if (flags & FILE_DISPOSITION_ON_CLOSE)
         fd->options &= ~FILE_DELETE_ON_CLOSE;

-    fd->closed->unlink = (flags & FILE_DISPOSITION_DELETE) ? 1 : 0;
-    if (fd->options & FILE_DELETE_ON_CLOSE)
-        fd->closed->unlink = -1;
+    fd->closed->disp_flags = (flags & FILE_DISPOSITION_DELETE) |
+        ((fd->options & FILE_DELETE_ON_CLOSE) ? FILE_DISPOSITION_DELETE : 0);
 }

/* set new name for the fd */