[PATCH v4 0/1] dcache: Translating dentry into pathname without taking rename_lock

[Waiman Long <Waiman.Long@hp.com>]

Change History

v3->v4:
 - Extract the begin and end blocks of the rename_lock sequence number
   check into helper functions to make the code easier to read.

v2->v3:
 - Simplify prepend_name() to blindly copy the dname over until it
   reaches a null byte or the specified length leaving the sequence
   check to handle error case.

v1->v2:
 - Check for internal vs external dname, taking d_lock only for
   external dname for safety.
 - Replace memchr() by a byte-by-byte checking for loop.
 - Try lockless dentry to pathname conversion 3 times before falling
   back to taking the rename_lock to prevent live-lock.
 - Make code re-factoring suggested by George Spelvin.

Waiman Long (1):
  dcache: Translating dentry into pathname without taking rename_lock

 fs/dcache.c |  196 ++++++++++++++++++++++++++++++++++++++++-------------------
 1 files changed, 133 insertions(+), 63 deletions(-)