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Date: Tue, 07 Jun 2011 09:57:09 -0500 From: Eric Sandeen <sandeen@...hat.com> To: Lukas Czerner <lczerner@...hat.com> CC: linux-ext4@...r.kernel.org, tytso@....edu, jack@...e.cz Subject: Re: [PATCH] ext3/ext4 Documentation: remove bh/nobh since it has been deprecated On 6/7/11 5:27 AM, Lukas Czerner wrote: > Bh and nobh mount option has been deprecated in ext4 > (206f7ab4f49a2021fcb8687f25395be77711ddee) and in ext3 > (4c4d3901225518ed1a4c938ba15ba09842a00770) > so remove those options from documentation. > > Signed-off-by: Lukas Czerner <lczerner@...hat.com> Thanks Lukas! Reviewed-by: Eric Sandeen <sandeen@...hat.com> Another nice documentation update would be to clearly mark all defaults in the doc files with (*) (or with values if the options take them) ... -Eric > --- > Documentation/filesystems/ext3.txt | 9 --------- > Documentation/filesystems/ext4.txt | 23 +++++++---------------- > 2 files changed, 7 insertions(+), 25 deletions(-) > > diff --git a/Documentation/filesystems/ext3.txt b/Documentation/filesystems/ext3.txt > index 272f80d..aee5560 100644 > --- a/Documentation/filesystems/ext3.txt > +++ b/Documentation/filesystems/ext3.txt > @@ -147,15 +147,6 @@ grpjquota=<file> during journal replay. They replace the above > package for more details > (http://sourceforge.net/projects/linuxquota). > > -bh (*) ext3 associates buffer heads to data pages to > -nobh (a) cache disk block mapping information > - (b) link pages into transaction to provide > - ordering guarantees. > - "bh" option forces use of buffer heads. > - "nobh" option tries to avoid associating buffer > - heads (supported only for "writeback" mode). > - > - > Specification > ============= > Ext3 shares all disk implementation with the ext2 filesystem, and adds > diff --git a/Documentation/filesystems/ext4.txt b/Documentation/filesystems/ext4.txt > index 3ae9bc9..232a575 100644 > --- a/Documentation/filesystems/ext4.txt > +++ b/Documentation/filesystems/ext4.txt > @@ -68,12 +68,12 @@ Note: More extensive information for getting started with ext4 can be > '-o barriers=[0|1]' mount option for both ext3 and ext4 filesystems > for a fair comparison. When tuning ext3 for best benchmark numbers, > it is often worthwhile to try changing the data journaling mode; '-o > - data=writeback,nobh' can be faster for some workloads. (Note > - however that running mounted with data=writeback can potentially > - leave stale data exposed in recently written files in case of an > - unclean shutdown, which could be a security exposure in some > - situations.) Configuring the filesystem with a large journal can > - also be helpful for metadata-intensive workloads. > + data=writeback' can be faster for some workloads. (Note however that > + running mounted with data=writeback can potentially leave stale data > + exposed in recently written files in case of an unclean shutdown, > + which could be a security exposure in some situations.) Configuring > + the filesystem with a large journal can also be helpful for > + metadata-intensive workloads. > > 2. Features > =========== > @@ -272,14 +272,6 @@ grpjquota=<file> during journal replay. They replace the above > package for more details > (http://sourceforge.net/projects/linuxquota). > > -bh (*) ext4 associates buffer heads to data pages to > -nobh (a) cache disk block mapping information > - (b) link pages into transaction to provide > - ordering guarantees. > - "bh" option forces use of buffer heads. > - "nobh" option tries to avoid associating buffer > - heads (supported only for "writeback" mode). > - > stripe=n Number of filesystem blocks that mballoc will try > to use for allocation size and alignment. For RAID5/6 > systems this should be the number of data > @@ -393,8 +385,7 @@ dioread_nolock locking. If the dioread_nolock option is specified > write and convert the extent to initialized after IO > completes. This approach allows ext4 code to avoid > using inode mutex, which improves scalability on high > - speed storages. However this does not work with nobh > - option and the mount will fail. Nor does it work with > + speed storages. However this does not work with > data journaling and dioread_nolock option will be > ignored with kernel warning. Note that dioread_nolock > code path is only used for extent-based files. -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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