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| author | Darrick J. Wong <darrick.wong@oracle.com> | 2016-12-19 14:06:56 -0800 |
|---|---|---|
| committer | Darrick J. Wong <darrick.wong@oracle.com> | 2016-12-20 22:46:32 -0800 |
| commit | fc7cfa00bcdc8b880c7ea99a22796febfaee7f2b (patch) | |
| tree | 8496fba1b75f87091f8669fce1084dba52e0f7a4 | |
| parent | 33bb782ac245caf8b4bc4c167ad662bf32077be5 (diff) | |
| download | xfs-documentation-fc7cfa00bcdc8b880c7ea99a22796febfaee7f2b.tar.gz | |
docs: enumerate possible directory ftype values
We don't actually list the ftype constants, so do that.
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
| -rw-r--r-- | design/XFS_Filesystem_Structure/directories.asciidoc | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/design/XFS_Filesystem_Structure/directories.asciidoc b/design/XFS_Filesystem_Structure/directories.asciidoc index 1758c4e..9bb50bd 100644 --- a/design/XFS_Filesystem_Structure/directories.asciidoc +++ b/design/XFS_Filesystem_Structure/directories.asciidoc @@ -26,6 +26,35 @@ directories. * An +offset+ or +tag+ used for iterative readdir calls. +* If the +XFS_SB_FEAT_INCOMPAT_FTYPE+ feature flag is set, each +directory entry contains an +ftype+ field that caches the inode's type +to avoid having to perform an inode lookup. + +.ftype values +[options="header"] +|===== +| Flag | Description +| +XFS_DIR3_FT_UNKNOWN+ | +Entry points to an unknown inode type. This should never appear on disk. +| +XFS_DIR3_FT_REG_FILE+ | +Entry points to a file. +| +XFS_DIR3_FT_DIR+ | +Entry points to another directory. +| +XFS_DIR3_FT_CHRDEV+ | +Entry points to a character device. +| +XFS_DIR3_FT_BLKDEV+ | +Entry points to a block device. +| +XFS_DIR3_FT_FIFO+ | +Entry points to a FIFO. +| +XFS_DIR3_FT_SOCK+ | +Entry points to a socket. +| +XFS_DIR3_FT_SYMLINK+ | +Entry points to a symbolic link. +| +XFS_DIR3_FT_WHT+ | +Entry points to an overlayfs whiteout file. This (as far as the author +knows) has never appeared on disk. +|===== + All non-shortform directories also contain two additional structures: ``leaves'' and ``freespace indexes''. |