diff options
Diffstat (limited to 'fs/xfs/xfs_trans_buf.c')
| -rw-r--r-- | fs/xfs/xfs_trans_buf.c | 84 |
1 files changed, 27 insertions, 57 deletions
diff --git a/fs/xfs/xfs_trans_buf.c b/fs/xfs/xfs_trans_buf.c index 296a7995a00..9132d162c4b 100644 --- a/fs/xfs/xfs_trans_buf.c +++ b/fs/xfs/xfs_trans_buf.c @@ -165,14 +165,6 @@ xfs_trans_get_buf(xfs_trans_t *tp, XFS_BUF_DONE(bp); } - /* - * If the buffer is stale then it was binval'ed - * since last read. This doesn't matter since the - * caller isn't allowed to use the data anyway. - */ - else if (XFS_BUF_ISSTALE(bp)) - ASSERT(!XFS_BUF_ISDELAYWRITE(bp)); - ASSERT(bp->b_transp == tp); bip = bp->b_fspriv; ASSERT(bip != NULL); @@ -418,19 +410,6 @@ xfs_trans_read_buf( return 0; shutdown_abort: - /* - * the theory here is that buffer is good but we're - * bailing out because the filesystem is being forcibly - * shut down. So we should leave the b_flags alone since - * the buffer's not staled and just get out. - */ -#if defined(DEBUG) - if (XFS_BUF_ISSTALE(bp) && XFS_BUF_ISDELAYWRITE(bp)) - xfs_notice(mp, "about to pop assert, bp == 0x%p", bp); -#endif - ASSERT((bp->b_flags & (XBF_STALE|XBF_DELWRI)) != - (XBF_STALE|XBF_DELWRI)); - trace_xfs_trans_read_buf_shut(bp, _RET_IP_); xfs_buf_relse(bp); *bpp = NULL; @@ -649,22 +628,33 @@ xfs_trans_log_buf(xfs_trans_t *tp, /* - * This called to invalidate a buffer that is being used within - * a transaction. Typically this is because the blocks in the - * buffer are being freed, so we need to prevent it from being - * written out when we're done. Allowing it to be written again - * might overwrite data in the free blocks if they are reallocated - * to a file. + * Invalidate a buffer that is being used within a transaction. + * + * Typically this is because the blocks in the buffer are being freed, so we + * need to prevent it from being written out when we're done. Allowing it + * to be written again might overwrite data in the free blocks if they are + * reallocated to a file. * - * We prevent the buffer from being written out by clearing the - * B_DELWRI flag. We can't always - * get rid of the buf log item at this point, though, because - * the buffer may still be pinned by another transaction. If that - * is the case, then we'll wait until the buffer is committed to - * disk for the last time (we can tell by the ref count) and - * free it in xfs_buf_item_unpin(). Until it is cleaned up we - * will keep the buffer locked so that the buffer and buf log item - * are not reused. + * We prevent the buffer from being written out by marking it stale. We can't + * get rid of the buf log item at this point because the buffer may still be + * pinned by another transaction. If that is the case, then we'll wait until + * the buffer is committed to disk for the last time (we can tell by the ref + * count) and free it in xfs_buf_item_unpin(). Until that happens we will + * keep the buffer locked so that the buffer and buf log item are not reused. + * + * We also set the XFS_BLF_CANCEL flag in the buf log format structure and log + * the buf item. This will be used at recovery time to determine that copies + * of the buffer in the log before this should not be replayed. + * + * We mark the item descriptor and the transaction dirty so that we'll hold + * the buffer until after the commit. + * + * Since we're invalidating the buffer, we also clear the state about which + * parts of the buffer have been logged. We also clear the flag indicating + * that this is an inode buffer since the data in the buffer will no longer + * be valid. + * + * We set the stale bit in the buffer as well since we're getting rid of it. */ void xfs_trans_binval( @@ -684,7 +674,6 @@ xfs_trans_binval( * If the buffer is already invalidated, then * just return. */ - ASSERT(!(XFS_BUF_ISDELAYWRITE(bp))); ASSERT(XFS_BUF_ISSTALE(bp)); ASSERT(!(bip->bli_flags & (XFS_BLI_LOGGED | XFS_BLI_DIRTY))); ASSERT(!(bip->bli_format.blf_flags & XFS_BLF_INODE_BUF)); @@ -694,27 +683,8 @@ xfs_trans_binval( return; } - /* - * Clear the dirty bit in the buffer and set the STALE flag - * in the buf log item. The STALE flag will be used in - * xfs_buf_item_unpin() to determine if it should clean up - * when the last reference to the buf item is given up. - * We set the XFS_BLF_CANCEL flag in the buf log format structure - * and log the buf item. This will be used at recovery time - * to determine that copies of the buffer in the log before - * this should not be replayed. - * We mark the item descriptor and the transaction dirty so - * that we'll hold the buffer until after the commit. - * - * Since we're invalidating the buffer, we also clear the state - * about which parts of the buffer have been logged. We also - * clear the flag indicating that this is an inode buffer since - * the data in the buffer will no longer be valid. - * - * We set the stale bit in the buffer as well since we're getting - * rid of it. - */ xfs_buf_stale(bp); + bip->bli_flags |= XFS_BLI_STALE; bip->bli_flags &= ~(XFS_BLI_INODE_BUF | XFS_BLI_LOGGED | XFS_BLI_DIRTY); bip->bli_format.blf_flags &= ~XFS_BLF_INODE_BUF; |