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authorDavid Howells <dhowells@redhat.com>2012-02-16 17:49:42 +0000
committerH. Peter Anvin <hpa@zytor.com>2012-02-19 10:30:52 -0800
commit1dce27c5aa6770e9d195f2bb7db1db3d4dde5591 (patch)
tree4ad3ffeee95cb5b10e047b7cb9bdbb48cfc734e0 /Documentation/filesystems/files.txt
parent8b3d1cda4f5ff0d7c2ae910ea8fd03493996912f (diff)
Wrap accesses to the fd_sets in struct fdtable
Wrap accesses to the fd_sets in struct fdtable (for recording open files and close-on-exec flags) so that we can move away from using fd_sets since we abuse the fd_set structs by not allocating the full-sized structure under normal circumstances and by non-core code looking at the internals of the fd_sets. The first abuse means that use of FD_ZERO() on these fd_sets is not permitted, since that cannot be told about their abnormal lengths. This introduces six wrapper functions for setting, clearing and testing close-on-exec flags and fd-is-open flags: void __set_close_on_exec(int fd, struct fdtable *fdt); void __clear_close_on_exec(int fd, struct fdtable *fdt); bool close_on_exec(int fd, const struct fdtable *fdt); void __set_open_fd(int fd, struct fdtable *fdt); void __clear_open_fd(int fd, struct fdtable *fdt); bool fd_is_open(int fd, const struct fdtable *fdt); Note that I've prepended '__' to the names of the set/clear functions because they require the caller to hold a lock to use them. Note also that I haven't added wrappers for looking behind the scenes at the the array. Possibly that should exist too. Signed-off-by: David Howells <dhowells@redhat.com> Link: http://lkml.kernel.org/r/20120216174942.23314.1364.stgit@warthog.procyon.org.uk Signed-off-by: H. Peter Anvin <hpa@zytor.com> Cc: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'Documentation/filesystems/files.txt')
-rw-r--r--Documentation/filesystems/files.txt4
1 files changed, 2 insertions, 2 deletions
diff --git a/Documentation/filesystems/files.txt b/Documentation/filesystems/files.txt
index ac2facc50d2a..46dfc6b038c3 100644
--- a/Documentation/filesystems/files.txt
+++ b/Documentation/filesystems/files.txt
@@ -113,8 +113,8 @@ the fdtable structure -
if (fd >= 0) {
/* locate_fd() may have expanded fdtable, load the ptr */
fdt = files_fdtable(files);
- FD_SET(fd, fdt->open_fds);
- FD_CLR(fd, fdt->close_on_exec);
+ __set_open_fd(fd, fdt);
+ __clear_close_on_exec(fd, fdt);
spin_unlock(&files->file_lock);
.....