Theodore Tso wrote: > I really don't think this tweak to Documentation/filesystems/ext4.txt > is necessary, but if we going to do this, I want to tighten up the > explanation. > > - Ted > I agree. Thanks. > ext4: Add fine print for the 32000 subdirectory limit > > Some poeple are reading the ext4 feature list too literally and create > dubious test cases involving very long filenames and 1k blocksize and > then complain when they run into an htree-imposed limit. So add fine > print to the "fix 32000 subdirectory limit" ext4 feature. > > Signed-off-by: "Theodore Ts'o" <tytso@xxxxxxx> > diff --git a/Documentation/filesystems/ext4.txt b/Documentation/filesystems/ext4.txt > index cec829b..5c484ae 100644 > --- a/Documentation/filesystems/ext4.txt > +++ b/Documentation/filesystems/ext4.txt > @@ -85,7 +85,7 @@ Note: More extensive information for getting started with ext4 can be > * extent format more robust in face of on-disk corruption due to magics, > * internal redundancy in tree > * improved file allocation (multi-block alloc) > -* fix 32000 subdirectory limit > +* lift 32000 subdirectory limit imposed by i_links_count[1] > * nsec timestamps for mtime, atime, ctime, create time > * inode version field on disk (NFSv4, Lustre) > * reduced e2fsck time via uninit_bg feature > @@ -100,6 +100,9 @@ Note: More extensive information for getting started with ext4 can be > * efficent new ordered mode in JBD2 and ext4(avoid using buffer head to force > the ordering) > > +[1] Filesystems with a block size of 1k may see a limit imposed by the > +directory hash tree having a maximum depth of two. > + > 2.2 Candidate features for future inclusion > > * Online defrag (patches available but not well tested) > > > -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
