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authorTheodore Ts'o <tytso@mit.edu>2009-02-23 00:51:57 -0500
committerTheodore Ts'o <tytso@mit.edu>2009-02-23 00:51:57 -0500
commit722bde6875bfb49a0c84e5601eb82dd7ac02d27c (patch)
tree03c51a876ba9f4f3e0a796f30b0bd86f632de45d /Documentation
parent7a262f7c69163cd4811f2f838faef5c5b18439c9 (diff)
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@mit.edu>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/filesystems/ext4.txt5
1 files changed, 4 insertions, 1 deletions
diff --git a/Documentation/filesystems/ext4.txt b/Documentation/filesystems/ext4.txt
index cec829bc7291..5c484aec2bab 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
85* extent format more robust in face of on-disk corruption due to magics, 85* extent format more robust in face of on-disk corruption due to magics,
86* internal redundancy in tree 86* internal redundancy in tree
87* improved file allocation (multi-block alloc) 87* improved file allocation (multi-block alloc)
88* fix 32000 subdirectory limit 88* lift 32000 subdirectory limit imposed by i_links_count[1]
89* nsec timestamps for mtime, atime, ctime, create time 89* nsec timestamps for mtime, atime, ctime, create time
90* inode version field on disk (NFSv4, Lustre) 90* inode version field on disk (NFSv4, Lustre)
91* reduced e2fsck time via uninit_bg feature 91* reduced e2fsck time via uninit_bg feature
@@ -100,6 +100,9 @@ Note: More extensive information for getting started with ext4 can be
100* efficent new ordered mode in JBD2 and ext4(avoid using buffer head to force 100* efficent new ordered mode in JBD2 and ext4(avoid using buffer head to force
101 the ordering) 101 the ordering)
102 102
103[1] Filesystems with a block size of 1k may see a limit imposed by the
104directory hash tree having a maximum depth of two.
105
1032.2 Candidate features for future inclusion 1062.2 Candidate features for future inclusion
104 107
105* Online defrag (patches available but not well tested) 108* Online defrag (patches available but not well tested)