[XFS] Improve error handling for the zero-fsblock extent detection code.

SGI-PV: 955302
SGI-Modid: xfs-linux-melb:xfs-kern:26802a

Signed-off-by: Nathan Scott <nathans@sgi.com>
Signed-off-by: Tim Shimmin <tes@sgi.com>

diff --git a/fs/xfs/linux-2.6/xfs_globals.c b/fs/xfs/linux-2.6/xfs_globals.c
index 6c162c3..ed3a5e1 100644 (file)
--- a/fs/xfs/linux-2.6/xfs_globals.c
+++ b/fs/xfs/linux-2.6/xfs_globals.c
@@ -34,7 +34,7 @@ xfs_param_t xfs_params = {
        .restrict_chown = {     0,              1,              1       },
        .sgid_inherit   = {     0,              0,              1       },
        .symlink_mode   = {     0,              0,              1       },
-       .panic_mask     = {     0,              0,              127     },
+       .panic_mask     = {     0,              0,              255     },
        .error_level    = {     0,              3,              11      },
        .syncd_timer    = {     1*100,          30*100,         7200*100},
        .stats_clear    = {     0,              0,              1       },

diff --git a/fs/xfs/xfs_bmap.c b/fs/xfs/xfs_bmap.c
index e28146f..5b050c0 100644 (file)
--- a/fs/xfs/xfs_bmap.c
+++ b/fs/xfs/xfs_bmap.c
@@ -3705,7 +3705,7 @@ STATIC xfs_bmbt_rec_t *                 /* pointer to found extent entry */
 xfs_bmap_search_extents(
        xfs_inode_t     *ip,            /* incore inode pointer */
        xfs_fileoff_t   bno,            /* block number searched for */
-       int             whichfork,      /* data or attr fork */
+       int             fork,           /* data or attr fork */
        int             *eofp,          /* out: end of file found */
        xfs_extnum_t    *lastxp,        /* out: last extent index */
        xfs_bmbt_irec_t *gotp,          /* out: extent entry found */
@@ -3713,25 +3713,28 @@ xfs_bmap_search_extents(
 {
        xfs_ifork_t     *ifp;           /* inode fork pointer */
        xfs_bmbt_rec_t  *ep;            /* extent record pointer */
-       int             rt;             /* realtime flag    */
 
        XFS_STATS_INC(xs_look_exlist);
-       ifp = XFS_IFORK_PTR(ip, whichfork);
+       ifp = XFS_IFORK_PTR(ip, fork);
 
        ep = xfs_bmap_search_multi_extents(ifp, bno, eofp, lastxp, gotp, prevp);
 
-       rt = (whichfork == XFS_DATA_FORK) && XFS_IS_REALTIME_INODE(ip);
-       if (unlikely(!rt && !gotp->br_startblock && (*lastxp != NULLEXTNUM))) {
-                cmn_err(CE_PANIC,"Access to block zero: fs: <%s> inode: %lld "
-                       "start_block : %llx start_off : %llx blkcnt : %llx "
-                       "extent-state : %x \n",
-                       (ip->i_mount)->m_fsname, (long long)ip->i_ino,
+       if (unlikely(!(gotp->br_startblock) && (*lastxp != NULLEXTNUM) &&
+                    !(XFS_IS_REALTIME_INODE(ip) && fork == XFS_DATA_FORK))) {
+               xfs_cmn_err(XFS_PTAG_FSBLOCK_ZERO, CE_ALERT, ip->i_mount,
+                               "Access to block zero in inode %llu "
+                               "start_block: %llx start_off: %llx "
+                               "blkcnt: %llx extent-state: %x lastx: %x\n",
+                       (unsigned long long)ip->i_ino,
                        (unsigned long long)gotp->br_startblock,
                        (unsigned long long)gotp->br_startoff,
                        (unsigned long long)gotp->br_blockcount,
-                       gotp->br_state);
-        }
-        return ep;
+                       gotp->br_state, *lastxp);
+               *lastxp = NULLEXTNUM;
+               *eofp = 1;
+               return NULL;
+       }
+       return ep;
 }
 
 

diff --git a/fs/xfs/xfs_error.h b/fs/xfs/xfs_error.h
index f90fd50..0893e16 100644 (file)
--- a/fs/xfs/xfs_error.h
+++ b/fs/xfs/xfs_error.h
@@ -167,6 +167,7 @@ extern int xfs_errortag_clearall_umount(int64_t fsid, char *fsname, int loud);
 #define                XFS_PTAG_SHUTDOWN_CORRUPT       0x00000010
 #define                XFS_PTAG_SHUTDOWN_IOERROR       0x00000020
 #define                XFS_PTAG_SHUTDOWN_LOGERROR      0x00000040
+#define                XFS_PTAG_FSBLOCK_ZERO           0x00000080
 
 struct xfs_mount;
 /* PRINTFLIKE4 */

diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c
index f1949c1..1965512 100644 (file)
--- a/fs/xfs/xfs_iomap.c
+++ b/fs/xfs/xfs_iomap.c
@@ -398,6 +398,23 @@ xfs_flush_space(
        return 1;
 }
 
+STATIC int
+xfs_cmn_err_fsblock_zero(
+       xfs_inode_t     *ip,
+       xfs_bmbt_irec_t *imap)
+{
+       xfs_cmn_err(XFS_PTAG_FSBLOCK_ZERO, CE_ALERT, ip->i_mount,
+                       "Access to block zero in inode %llu "
+                       "start_block: %llx start_off: %llx "
+                       "blkcnt: %llx extent-state: %x\n",
+               (unsigned long long)ip->i_ino,
+               (unsigned long long)imap->br_startblock,
+               (unsigned long long)imap->br_startoff,
+               (unsigned long long)imap->br_blockcount,
+               imap->br_state);
+       return EFSCORRUPTED;
+}
+
 int
 xfs_iomap_write_direct(
        xfs_inode_t     *ip,
@@ -536,23 +553,17 @@ xfs_iomap_write_direct(
         * Copy any maps to caller's array and return any error.
         */
        if (nimaps == 0) {
-               error = (ENOSPC);
+               error = ENOSPC;
+               goto error_out;
+       }
+
+       if (unlikely(!imap.br_startblock && !(io->io_flags & XFS_IOCORE_RT))) {
+               error = xfs_cmn_err_fsblock_zero(ip, &imap);
                goto error_out;
        }
 
        *ret_imap = imap;
        *nmaps = 1;
-       if ( !(io->io_flags & XFS_IOCORE_RT)  && !ret_imap->br_startblock) {
-                cmn_err(CE_PANIC,"Access to block zero:  fs <%s> inode: %lld "
-                        "start_block : %llx start_off : %llx blkcnt : %llx "
-                        "extent-state : %x \n",
-                        (ip->i_mount)->m_fsname,
-                        (long long)ip->i_ino,
-                        (unsigned long long)ret_imap->br_startblock,
-                       (unsigned long long)ret_imap->br_startoff,
-                        (unsigned long long)ret_imap->br_blockcount,
-                       ret_imap->br_state);
-        }
        return 0;
 
 error0:        /* Cancel bmap, unlock inode, unreserve quota blocks, cancel trans */
@@ -715,17 +726,8 @@ retry:
                goto retry;
        }
 
-       if (!(io->io_flags & XFS_IOCORE_RT)  && !ret_imap->br_startblock) {
-               cmn_err(CE_PANIC,"Access to block zero:  fs <%s> inode: %lld "
-                        "start_block : %llx start_off : %llx blkcnt : %llx "
-                        "extent-state : %x \n",
-                        (ip->i_mount)->m_fsname,
-                        (long long)ip->i_ino,
-                        (unsigned long long)ret_imap->br_startblock,
-                       (unsigned long long)ret_imap->br_startoff,
-                        (unsigned long long)ret_imap->br_blockcount,
-                       ret_imap->br_state);
-       }
+       if (unlikely(!imap[0].br_startblock && !(io->io_flags & XFS_IOCORE_RT)))
+               return xfs_cmn_err_fsblock_zero(ip, &imap[0]);
 
        *ret_imap = imap[0];
        *nmaps = 1;
@@ -853,24 +855,10 @@ xfs_iomap_write_allocate(
                 * See if we were able to allocate an extent that
                 * covers at least part of the callers request
                 */
-
                for (i = 0; i < nimaps; i++) {
-                       if (!(io->io_flags & XFS_IOCORE_RT)  &&
-                           !imap[i].br_startblock) {
-                               cmn_err(CE_PANIC,"Access to block zero:  "
-                                       "fs <%s> inode: %lld "
-                                       "start_block : %llx start_off : %llx "
-                                       "blkcnt : %llx extent-state : %x \n",
-                                       (ip->i_mount)->m_fsname,
-                                       (long long)ip->i_ino,
-                                       (unsigned long long)
-                                               imap[i].br_startblock,
-                                       (unsigned long long)
-                                               imap[i].br_startoff,
-                                       (unsigned long long)
-                                               imap[i].br_blockcount,
-                                       imap[i].br_state);
-                        }
+                       if (unlikely(!imap[i].br_startblock &&
+                                    !(io->io_flags & XFS_IOCORE_RT)))
+                               return xfs_cmn_err_fsblock_zero(ip, &imap[i]);
                        if ((offset_fsb >= imap[i].br_startoff) &&
                            (offset_fsb < (imap[i].br_startoff +
                                           imap[i].br_blockcount))) {
@@ -941,7 +929,7 @@ xfs_iomap_write_unwritten(
                                XFS_WRITE_LOG_COUNT);
                if (error) {
                        xfs_trans_cancel(tp, 0);
-                       goto error0;
+                       return XFS_ERROR(error);
                }
 
                xfs_ilock(ip, XFS_ILOCK_EXCL);
@@ -967,19 +955,11 @@ xfs_iomap_write_unwritten(
                error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES, NULL);
                xfs_iunlock(ip, XFS_ILOCK_EXCL);
                if (error)
-                       goto error0;
-
-               if ( !(io->io_flags & XFS_IOCORE_RT)  && !imap.br_startblock) {
-                       cmn_err(CE_PANIC,"Access to block zero:  fs <%s> "
-                               "inode: %lld start_block : %llx start_off : "
-                               "%llx blkcnt : %llx extent-state : %x \n",
-                               (ip->i_mount)->m_fsname,
-                               (long long)ip->i_ino,
-                               (unsigned long long)imap.br_startblock,
-                               (unsigned long long)imap.br_startoff,
-                               (unsigned long long)imap.br_blockcount,
-                               imap.br_state);
-               }
+                       return XFS_ERROR(error);
+
+               if (unlikely(!imap.br_startblock &&
+                            !(io->io_flags & XFS_IOCORE_RT)))
+                       return xfs_cmn_err_fsblock_zero(ip, &imap);
 
                if ((numblks_fsb = imap.br_blockcount) == 0) {
                        /*
@@ -999,6 +979,5 @@ error_on_bmapi_transaction:
        xfs_bmap_cancel(&free_list);
        xfs_trans_cancel(tp, (XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT));
        xfs_iunlock(ip, XFS_ILOCK_EXCL);
-error0:
        return XFS_ERROR(error);
 }