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[PATCH] files: break up files struct

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In order for the RCU to work, the file table array, sets and their sizes must
be updated atomically.  Instead of ensuring this through too many memory
barriers, we put the arrays and their sizes in a separate structure.  This
patch takes the first step of putting the file table elements in a separate
structure fdtable that is embedded withing files_struct.  It also changes all
the users to refer to the file table using files_fdtable() macro.  Subsequent
applciation of RCU becomes easier after this.

Signed-off-by: Dipankar Sarma <[email protected]>
Signed-Off-By: David Howells <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Dipankar Sarma 2005-09-09 13:04:10 -07:00 • committed by Linus Torvalds
commit badf16621c
17 changed files with 211 additions and 124 deletions
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6
security/selinux/hooks.c
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@ -1594,6 +1594,7 @@ static inline void flush_unauthorized_files(struct files_struct * files)
struct avc_audit_data ad;
struct file *file, *devnull = NULL;
struct tty_struct *tty = current->signal->tty;
struct fdtable *fdt;
long j = -1;
if (tty) {
@ -1627,9 +1628,10 @@ static inline void flush_unauthorized_files(struct files_struct * files)
j++;
i = j * __NFDBITS;
if (i >= files->max_fds || i >= files->max_fdset)
fdt = files_fdtable(files);
if (i >= fdt->max_fds || i >= fdt->max_fdset)
break;
set = files->open_fds->fds_bits[j];
set = fdt->open_fds->fds_bits[j];
if (!set)
continue;
spin_unlock(&files->file_lock);