Eric Lee / linux-smarc-t335x-v3.2

Download as
Browse Code ยป

Commit 99d1419d96d7df9cfa56bc977810be831bd5ef64

Authored by JANAK DESAI
Committed by Linus Torvalds
1 parent cf2e340f42
Exists in master and in 4 other branches v3.2_AM335xPSP_04.06.00.11, v3.2_NEWT335xPSP_04.06.00.11, v3.2_SBC_SMARTMEN, v3.2_SMARCT335xPSP_04.06.00.11

[PATCH] unshare system call -v5: unshare filesystem info 

If filesystem structure is being shared, allocate a new one and copy
information from the current, shared, structure.

Signed-off-by: Janak Desai <janak@us.ibm.com>
Cc: Al Viro <viro@ftp.linux.org.uk>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Michael Kerrisk <mtk-manpages@gmx.net>
Cc: Andi Kleen <ak@muc.de>
Cc: Paul Mackerras <paulus@samba.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Showing 1 changed file with 6 additions and 3 deletions Side-by-side Diff

... ... @@ -1371,15 +1371,18 @@
1371 1371 }
1372 1372  
1373 1373 /*
1374   - * Unsharing of fs info for tasks created with CLONE_FS is not supported yet
  1374 + * Unshare the filesystem structure if it is being shared
1375 1375 */
1376 1376 static int unshare_fs(unsigned long unshare_flags, struct fs_struct **new_fsp)
1377 1377 {
1378 1378 struct fs_struct *fs = current->fs;
1379 1379  
1380 1380 if ((unshare_flags & CLONE_FS) &&
1381   - (fs && atomic_read(&fs->count) > 1))
1382   - return -EINVAL;
  1381 + (fs && atomic_read(&fs->count) > 1)) {
  1382 + *new_fsp = __copy_fs_struct(current->fs);
  1383 + if (!*new_fsp)
  1384 + return -ENOMEM;
  1385 + }
1383 1386  
1384 1387 return 0;
1385 1388 }