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[PATCHv2 4/5] xfs: record log sector size rather than log2(that)

To: xfs@xxxxxxxxxxx
Subject: [PATCHv2 4/5] xfs: record log sector size rather than log2(that)
From: Alex Elder <aelder@xxxxxxx>
Date: Fri, 16 Apr 2010 15:53:53 -0500
User-agent: Heirloom mailx 12.4 7/29/08
Change struct log so it keeps track of the size (in basic blocks) of
a log sector in l_sectBBsize rather than the log-base-2 of that
value (previously, l_sectbb_log).  The name was chosen for
consistency with the other fields in the structure that represent
a number of basic blocks.

(Updated so that a variable used in computing and verifying a log's
sector size is named "log2_size".  Also added the "BB" to the
structure field name, based on feedback from Eric Sandeen.  Also
dropped some superfluous parentheses.)

Signed-off-by: Alex Elder <aelder@xxxxxxx>

---
 fs/xfs/xfs_log.c         |   33 ++++++++++++++++++---------------
 fs/xfs/xfs_log_priv.h    |    2 +-
 fs/xfs/xfs_log_recover.c |   27 ++++++++++++---------------
 3 files changed, 31 insertions(+), 31 deletions(-)

Index: b/fs/xfs/xfs_log.c
===================================================================
--- a/fs/xfs/xfs_log.c
+++ b/fs/xfs/xfs_log.c
@@ -1039,6 +1039,7 @@ xlog_alloc_log(xfs_mount_t        *mp,
        int                     i;
        int                     iclogsize;
        int                     error = ENOMEM;
+       uint                    log2_size = 0;
 
        log = kmem_zalloc(sizeof(xlog_t), KM_MAYFAIL);
        if (!log) {
@@ -1064,29 +1065,31 @@ xlog_alloc_log(xfs_mount_t      *mp,
 
        error = EFSCORRUPTED;
        if (xfs_sb_version_hassector(&mp->m_sb)) {
-               log->l_sectbb_log = mp->m_sb.sb_logsectlog - BBSHIFT;
-               if (log->l_sectbb_log < 0 ||
-                   log->l_sectbb_log > mp->m_sectbb_log) {
-                       xlog_warn("XFS: Log sector size (0x%x) out of range.",
-                                               log->l_sectbb_log);
+               log2_size = mp->m_sb.sb_logsectlog;
+               if (log2_size < BBSHIFT) {
+                       xlog_warn("XFS: Log sector size too small "
+                               "(0x%x < 0x%x)", log2_size, BBSHIFT);
                        goto out_free_log;
                }
 
-               /* for larger sector sizes, must have v2 or external log */
-               if (log->l_sectbb_log != 0 &&
-                   (log->l_logBBstart != 0 &&
-                    !xfs_sb_version_haslogv2(&mp->m_sb))) {
-                       xlog_warn("XFS: log sector size (0x%x) invalid "
-                                 "for configuration.", log->l_sectbb_log);
+               log2_size -= BBSHIFT;
+               if (log2_size > mp->m_sectbb_log) {
+                       xlog_warn("XFS: Log sector size too large "
+                               "(0x%x > 0x%x)", log2_size, mp->m_sectbb_log);
                        goto out_free_log;
                }
-               if (mp->m_sb.sb_logsectlog < BBSHIFT) {
-                       xlog_warn("XFS: Log sector log (0x%x) too small.",
-                                               mp->m_sb.sb_logsectlog);
+
+               /* for larger sector sizes, must have v2 or external log */
+               if (log2_size && log->l_logBBstart > 0 &&
+                           !xfs_sb_version_haslogv2(&mp->m_sb)) {
+
+                       xlog_warn("XFS: log sector size (0x%x) invalid "
+                                 "for configuration.", log2_size);
                        goto out_free_log;
                }
        }
-       log->l_sectbb_mask = (1 << log->l_sectbb_log) - 1;
+       log->l_sectBBsize = 1 << log2_size;
+       log->l_sectbb_mask = log->l_sectBBsize - 1;
 
        xlog_get_iclog_buffer_size(mp, log);
 
Index: b/fs/xfs/xfs_log_priv.h
===================================================================
--- a/fs/xfs/xfs_log_priv.h
+++ b/fs/xfs/xfs_log_priv.h
@@ -396,7 +396,7 @@ typedef struct log {
        struct xfs_buf_cancel   **l_buf_cancel_table;
        int                     l_iclog_hsize;  /* size of iclog header */
        int                     l_iclog_heads;  /* # of iclog header sectors */
-       uint                    l_sectbb_log;   /* log2 of sector size in BBs */
+       uint                    l_sectBBsize;   /* sector size in BBs */
        uint                    l_sectbb_mask;  /* sector size (in BBs)
                                                 * alignment mask */
        int                     l_iclog_size;   /* size of log in bytes */
Index: b/fs/xfs/xfs_log_recover.c
===================================================================
--- a/fs/xfs/xfs_log_recover.c
+++ b/fs/xfs/xfs_log_recover.c
@@ -60,9 +60,6 @@ STATIC void   xlog_recover_check_summary(x
  * Sector aligned buffer routines for buffer create/read/write/access
  */
 
-/* Number of basic blocks in a log sector */
-#define xlog_sectbb(log) (1 << (log)->l_sectbb_log)
-
 /*
  * Verify the given count of basic blocks is valid number of blocks
  * to specify for an operation involving the given XFS log buffer.
@@ -110,9 +107,9 @@ xlog_get_bp(
         * extend the buffer by one extra log sector to ensure
         * there's space to accomodate this possiblility.
         */
-       if (nbblks > 1 && log->l_sectbb_log)
-               nbblks += xlog_sectbb(log);
-       nbblks = round_up(nbblks, xlog_sectbb(log));
+       if (nbblks > 1 && log->l_sectBBsize > 1)
+               nbblks += log->l_sectBBsize;
+       nbblks = round_up(nbblks, log->l_sectBBsize);
 
        return xfs_buf_get_noaddr(BBTOB(nbblks), log->l_mp->m_logdev_targp);
 }
@@ -133,7 +130,7 @@ xlog_align(
 {
        xfs_caddr_t     ptr;
 
-       if (!log->l_sectbb_log)
+       if (log->l_sectBBsize == 1)
                return XFS_BUF_PTR(bp);
 
        ptr = XFS_BUF_PTR(bp) + BBTOB((int)blk_no & log->l_sectbb_mask);
@@ -162,8 +159,8 @@ xlog_bread_noalign(
                return EFSCORRUPTED;
        }
 
-       blk_no = round_down(blk_no, xlog_sectbb(log));
-       nbblks = round_up(nbblks, xlog_sectbb(log));
+       blk_no = round_down(blk_no, log->l_sectBBsize);
+       nbblks = round_up(nbblks, log->l_sectBBsize);
 
        ASSERT(nbblks > 0);
        ASSERT(BBTOB(nbblks) <= XFS_BUF_SIZE(bp));
@@ -221,8 +218,8 @@ xlog_bwrite(
                return EFSCORRUPTED;
        }
 
-       blk_no = round_down(blk_no, xlog_sectbb(log));
-       nbblks = round_up(nbblks, xlog_sectbb(log));
+       blk_no = round_down(blk_no, log->l_sectBBsize);
+       nbblks = round_up(nbblks, log->l_sectBBsize);
 
        ASSERT(nbblks > 0);
        ASSERT(BBTOB(nbblks) <= XFS_BUF_SIZE(bp));
@@ -410,7 +407,7 @@ xlog_find_verify_cycle(
        bufblks = 1 << ffs(nbblks);
        while (!(bp = xlog_get_bp(log, bufblks))) {
                bufblks >>= 1;
-               if (bufblks < xlog_sectbb(log))
+               if (bufblks < log->l_sectBBsize)
                        return ENOMEM;
        }
 
@@ -1181,7 +1178,7 @@ xlog_write_log_records(
        xfs_caddr_t     offset;
        xfs_buf_t       *bp;
        int             balign, ealign;
-       int             sectbb = xlog_sectbb(log);
+       int             sectbb = log->l_sectBBsize;
        int             end_block = start_block + blocks;
        int             bufblks;
        int             error = 0;
@@ -1196,7 +1193,7 @@ xlog_write_log_records(
        bufblks = 1 << ffs(blocks);
        while (!(bp = xlog_get_bp(log, bufblks))) {
                bufblks >>= 1;
-               if (bufblks < xlog_sectbb(log))
+               if (bufblks < sectbb)
                        return ENOMEM;
        }
 
@@ -3553,7 +3550,7 @@ xlog_do_recovery_pass(
                        hblks = 1;
                }
        } else {
-               ASSERT(log->l_sectbb_log == 0);
+               ASSERT(log->l_sectBBsize == 1);
                hblks = 1;
                hbp = xlog_get_bp(log, 1);
                h_size = XLOG_BIG_RECORD_BSIZE;

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