nfsd4: set shorter timeout

[safe/jmp/linux-2.6] / fs / xfs / linux-2.6 / xfs_buf.h

diff --git a/fs/xfs/linux-2.6/xfs_buf.h b/fs/xfs/linux-2.6/xfs_buf.h
index a3d207d..9b4d666 100644 (file)
--- a/fs/xfs/linux-2.6/xfs_buf.h
+++ b/fs/xfs/linux-2.6/xfs_buf.h
@@ -66,6 +66,33 @@ typedef enum {
        _XBF_PAGES = (1 << 18),     /* backed by refcounted pages          */
        _XBF_RUN_QUEUES = (1 << 19),/* run block device task queue         */
        _XBF_DELWRI_Q = (1 << 21),   /* buffer on delwri queue             */
+
+       /*
+        * Special flag for supporting metadata blocks smaller than a FSB.
+        *
+        * In this case we can have multiple xfs_buf_t on a single page and
+        * need to lock out concurrent xfs_buf_t readers as they only
+        * serialise access to the buffer.
+        *
+        * If the FSB size >= PAGE_CACHE_SIZE case, we have no serialisation
+        * between reads of the page. Hence we can have one thread read the
+        * page and modify it, but then race with another thread that thinks
+        * the page is not up-to-date and hence reads it again.
+        *
+        * The result is that the first modifcation to the page is lost.
+        * This sort of AGF/AGI reading race can happen when unlinking inodes
+        * that require truncation and results in the AGI unlinked list
+        * modifications being lost.
+        */
+       _XBF_PAGE_LOCKED = (1 << 22),
+
+       /*
+        * If we try a barrier write, but it fails we have to communicate
+        * this to the upper layers.  Unfortunately b_error gets overwritten
+        * when the buffer is re-issued so we have to add another flag to
+        * keep this information.
+        */
+       _XFS_BARRIER_FAILED = (1 << 23),
 } xfs_buf_flags_t;
 
 typedef enum {
@@ -138,10 +165,10 @@ typedef struct xfs_buf {
        xfs_buf_iodone_t        b_iodone;       /* I/O completion function */
        xfs_buf_relse_t         b_relse;        /* releasing function */
        xfs_buf_bdstrat_t       b_strat;        /* pre-write function */
-       struct semaphore        b_iodonesema;   /* Semaphore for I/O waiters */
+       struct completion       b_iowait;       /* queue for I/O waiters */
        void                    *b_fspriv;
        void                    *b_fspriv2;
-       void                    *b_fspriv3;
+       struct xfs_mount        *b_mount;
        unsigned short          b_error;        /* error code on I/O */
        unsigned int            b_page_count;   /* size of page array */
        unsigned int            b_offset;       /* page offset in first page */
@@ -187,9 +214,10 @@ extern void xfs_buf_lock(xfs_buf_t *);
 extern void xfs_buf_unlock(xfs_buf_t *);
 
 /* Buffer Read and Write Routines */
+extern int xfs_bawrite(void *mp, xfs_buf_t *bp);
+extern void xfs_bdwrite(void *mp, xfs_buf_t *bp);
 extern void xfs_buf_ioend(xfs_buf_t *, int);
 extern void xfs_buf_ioerror(xfs_buf_t *, int);
-extern int xfs_buf_iostart(xfs_buf_t *, xfs_buf_flags_t);
 extern int xfs_buf_iorequest(xfs_buf_t *);
 extern int xfs_buf_iowait(xfs_buf_t *);
 extern void xfs_buf_iomove(xfs_buf_t *, size_t, size_t, xfs_caddr_t,
@@ -284,10 +312,6 @@ extern void xfs_buf_trace(xfs_buf_t *, char *, void *, void *);
 #define XFS_BUF_UNORDERED(bp)  ((bp)->b_flags &= ~XBF_ORDERED)
 #define XFS_BUF_ISORDERED(bp)  ((bp)->b_flags & XBF_ORDERED)
 
-#define XFS_BUF_SHUT(bp)       do { } while (0)
-#define XFS_BUF_UNSHUT(bp)     do { } while (0)
-#define XFS_BUF_ISSHUT(bp)     (0)
-
 #define XFS_BUF_HOLD(bp)       xfs_buf_hold(bp)
 #define XFS_BUF_READ(bp)       ((bp)->b_flags |= XBF_READ)
 #define XFS_BUF_UNREAD(bp)     ((bp)->b_flags &= ~XBF_READ)
@@ -307,8 +331,6 @@ extern void xfs_buf_trace(xfs_buf_t *, char *, void *, void *);
 #define XFS_BUF_SET_FSPRIVATE(bp, val)         ((bp)->b_fspriv = (void*)(val))
 #define XFS_BUF_FSPRIVATE2(bp, type)           ((type)(bp)->b_fspriv2)
 #define XFS_BUF_SET_FSPRIVATE2(bp, val)                ((bp)->b_fspriv2 = (void*)(val))
-#define XFS_BUF_FSPRIVATE3(bp, type)           ((type)(bp)->b_fspriv3)
-#define XFS_BUF_SET_FSPRIVATE3(bp, val)                ((bp)->b_fspriv3 = (void*)(val))
 #define XFS_BUF_SET_START(bp)                  do { } while (0)
 #define XFS_BUF_SET_BRELSE_FUNC(bp, func)      ((bp)->b_relse = (func))
 
@@ -333,20 +355,12 @@ extern void xfs_buf_trace(xfs_buf_t *, char *, void *, void *);
 #define XFS_BUF_CPSEMA(bp)     (xfs_buf_cond_lock(bp) == 0)
 #define XFS_BUF_VSEMA(bp)      xfs_buf_unlock(bp)
 #define XFS_BUF_PSEMA(bp,x)    xfs_buf_lock(bp)
-#define XFS_BUF_V_IODONESEMA(bp) up(&bp->b_iodonesema);
+#define XFS_BUF_FINISH_IOWAIT(bp)      complete(&bp->b_iowait);
 
 #define XFS_BUF_SET_TARGET(bp, target) ((bp)->b_target = (target))
 #define XFS_BUF_TARGET(bp)             ((bp)->b_target)
 #define XFS_BUFTARG_NAME(target)       xfs_buf_target_name(target)
 
-static inline int xfs_bawrite(void *mp, xfs_buf_t *bp)
-{
-       bp->b_fspriv3 = mp;
-       bp->b_strat = xfs_bdstrat_cb;
-       xfs_buf_delwri_dequeue(bp);
-       return xfs_buf_iostart(bp, XBF_WRITE | XBF_ASYNC | _XBF_RUN_QUEUES);
-}
-
 static inline void xfs_buf_relse(xfs_buf_t *bp)
 {
        if (!bp->b_relse)
@@ -387,13 +401,6 @@ static inline int XFS_bwrite(xfs_buf_t *bp)
        return error;
 }
 
-static inline int xfs_bdwrite(void *mp, xfs_buf_t *bp)
-{
-       bp->b_strat = xfs_bdstrat_cb;
-       bp->b_fspriv3 = mp;
-       return xfs_buf_iostart(bp, XBF_DELWRI | XBF_ASYNC);
-}
-
 #define XFS_bdstrat(bp) xfs_buf_iorequest(bp)
 
 #define xfs_iowait(bp) xfs_buf_iowait(bp)
@@ -406,7 +413,7 @@ static inline int xfs_bdwrite(void *mp, xfs_buf_t *bp)
  *     Handling of buftargs.
  */
 extern xfs_buftarg_t *xfs_alloc_buftarg(struct block_device *, int);
-extern void xfs_free_buftarg(xfs_buftarg_t *, int);
+extern void xfs_free_buftarg(struct xfs_mount *, struct xfs_buftarg *);
 extern void xfs_wait_buftarg(xfs_buftarg_t *);
 extern int xfs_setsize_buftarg(xfs_buftarg_t *, unsigned int, unsigned int);
 extern int xfs_flush_buftarg(xfs_buftarg_t *, int);