xnu-3247.10.11.tar.gz

[apple/xnu.git] / bsd / hfs / hfscommon / Misc / FileExtentMapping.c

diff --git a/bsd/hfs/hfscommon/Misc/FileExtentMapping.c b/bsd/hfs/hfscommon/Misc/FileExtentMapping.c
index 11747510182ca7bd2182039a713d821b1f116eae..31249e05bff3d738cf63b0ae974d31dbcddafb21 100644 (file)
--- a/bsd/hfs/hfscommon/Misc/FileExtentMapping.c
+++ b/bsd/hfs/hfscommon/Misc/FileExtentMapping.c
@@ -889,14 +889,19 @@ should_pin_blocks(hfsmount_t *hfsmp, FCB *fcb)
        // it was an automatically added file and this function is intended
        // to pin new blocks being added to user-generated content.
        //
-       // If a file is marked FastDevPinned or FastDevCandidate it is an
-       // existing pinned file or a new file that should be pinned.
-       //
        if (fcb->ff_cp->c_attr.ca_recflags & kHFSAutoCandidateMask) {
                return 0;
        }
 
-       if ((fcb->ff_cp->c_attr.ca_recflags & (kHFSFastDevPinnedMask|kHFSFastDevCandidateMask)) != 0) {
+       //
+       // If a file is marked FastDevPinned it is an existing pinned file 
+       // or a new file that should be pinned.
+       //
+       // If a file is marked FastDevCandidate it is a new file that is
+       // being written to for the first time so we don't want to pin it
+       // just yet as it may not meet the criteria (i.e. too large).
+       //
+       if ((fcb->ff_cp->c_attr.ca_recflags & (kHFSFastDevPinnedMask)) != 0) {
                pin_blocks = 1;
        } else {
                pin_blocks = 0;