mirror of https://github.com/vitalif/e2fsprogs
Add support for a new inode flag, which is to be used
for indicating the top of directory hierarchies for the Orlov block allocator.bitmap-optimize
parent
085d2a8397
commit
15f9011add
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@ -40,6 +40,7 @@ static struct flags_name flags_array[] = {
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{ EXT2_ECOMPR_FL, "E", "Compression_Error" },
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{ EXT2_ECOMPR_FL, "E", "Compression_Error" },
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{ EXT3_JOURNAL_DATA_FL, "j", "Journaled_Data" },
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{ EXT3_JOURNAL_DATA_FL, "j", "Journaled_Data" },
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{ EXT2_NOTAIL_FL, "t", "No_Tailmerging" },
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{ EXT2_NOTAIL_FL, "t", "No_Tailmerging" },
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{ EXT2_TOPDIR_FL, "T", "Top_of_Directory_Hierarchies" },
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{ 0, NULL, NULL }
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{ 0, NULL, NULL }
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};
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};
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@ -232,9 +232,10 @@ struct ext2_dx_countlimit {
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#define EXT3_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
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#define EXT3_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
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#define EXT2_NOTAIL_FL 0x00008000 /* file tail should not be merged */
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#define EXT2_NOTAIL_FL 0x00008000 /* file tail should not be merged */
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#define EXT2_DIRSYNC_FL 0x00010000 /* Synchronous directory modifications */
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#define EXT2_DIRSYNC_FL 0x00010000 /* Synchronous directory modifications */
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#define EXT2_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
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#define EXT2_RESERVED_FL 0x80000000 /* reserved for ext2 lib */
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#define EXT2_RESERVED_FL 0x80000000 /* reserved for ext2 lib */
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#define EXT2_FL_USER_VISIBLE 0x0001DFFF /* User visible flags */
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#define EXT2_FL_USER_VISIBLE 0x0003DFFF /* User visible flags */
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#define EXT2_FL_USER_MODIFIABLE 0x000080FF /* User modifiable flags */
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#define EXT2_FL_USER_MODIFIABLE 0x000080FF /* User modifiable flags */
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/*
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/*
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@ -19,7 +19,7 @@ chattr \- change file attributes on a Linux second extended file system
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.B chattr
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.B chattr
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changes the file attributes on a Linux second extended file system.
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changes the file attributes on a Linux second extended file system.
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.PP
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.PP
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The format of a symbolic mode is +-=[ASacDdistu].
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The format of a symbolic mode is +-=[ASacDdisTtu].
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.PP
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.PP
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The operator `+' causes the selected attributes to be added to the
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The operator `+' causes the selected attributes to be added to the
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existing attributes of the files; `-' causes them to be removed; and
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existing attributes of the files; `-' causes them to be removed; and
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@ -28,7 +28,8 @@ existing attributes of the files; `-' causes them to be removed; and
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The letters `ASacDdijsu' select the new attributes for the files:
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The letters `ASacDdijsu' select the new attributes for the files:
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don't update atime (A), synchronous updates (S), synchronous directory
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don't update atime (A), synchronous updates (S), synchronous directory
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updates (D), append only (a), compressed (c), no dump (d), immutable (i),
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updates (D), append only (a), compressed (c), no dump (d), immutable (i),
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data journalling (j), secure deletion (s), and undeletable (u).
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data journalling (j), secure deletion (s), top of directory hierarchy
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(T), no tail-merging (t), and undeletable (u).
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.SH OPTIONS
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.SH OPTIONS
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.TP
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.TP
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.B \-R
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.B \-R
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@ -85,6 +86,10 @@ When a file with the `S' attribute set is modified,
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the changes are written synchronously on the disk; this is equivalent to
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the changes are written synchronously on the disk; this is equivalent to
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the `sync' mount option applied to a subset of the files.
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the `sync' mount option applied to a subset of the files.
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.PP
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.PP
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A directory with the 'T' attribute will be deemed to be the top of
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directory hierarchies for the purposes of the Orlov block allocator
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(which is used in newer kernels).
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.PP
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A file with the 't' attribute will not have a partial block fragment at
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A file with the 't' attribute will not have a partial block fragment at
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the of the file merged with other files (for those filesystems which
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the of the file merged with other files (for those filesystems which
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support tail-merging). This is necessary for applications such as LILO
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support tail-merging). This is necessary for applications such as LILO
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@ -98,6 +98,7 @@ static const struct flags_char flags_array[] = {
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{ EXT2_SECRM_FL, 's' },
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{ EXT2_SECRM_FL, 's' },
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{ EXT2_UNRM_FL, 'u' },
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{ EXT2_UNRM_FL, 'u' },
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{ EXT2_NOTAIL_FL, 't' },
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{ EXT2_NOTAIL_FL, 't' },
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{ EXT2_TOPDIR_FL, 'T' },
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{ 0, 0 }
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{ 0, 0 }
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};
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};
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