the mke2fs is enabling the dir_index feature by default now. This
shows dramatic performance improvements with 1 files per directory.
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determining how many RMW cycles the tail of an average I/O requires.
I'd guess a vast majority of IO will have the end similarly misaligned as
the start. Very little filesystem IO is 512 bytes, possibly excluding XFS
in an unusual mode.
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. At that point you need to do a tar/untar
(or whatever) to copy the data instead of a raw partition copy.
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and it would be useful for files that were not preallocated.
For filesystems that don't implement punch glibc() would do zero-filling
of the punched area I guess (to make it equivalent to reading from a
hole in the file).
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...
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recently modified (e.g. within the last 30 minutes) in the default case,
on the assumption that they might be deleted soon anyways.
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preallocation via fallocate/ioctl) so that
they don't have to zero-fill large files, or is there also automatic
preallocation of space to files (e.g. for O_APPEND files)?
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, not for a directory.
So I will use my new ioctl.
Though it might make sense to implement FIBMAP for a directory, to keep
it consistent and allow user-space tools like filefrag to work on
directories also.
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On Dec 15, 2006 14:37 -0800, Ulrich Drepper wrote:
Andreas Dilger wrote:
IMHO, once part of the information is optional, why bother making ANY
of it required? Consider ls -s on a distributed filesystem that has
UID+GID mapping. It doesn't actually NEED to return the UID+GID to ls
for each
the config help.
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of readdirplus(), and I think most people agree with
that part of it (though there is contention on whether readdirplus() is
needed at all).
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,
which also depends on st_mode.
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with readdirplus() also allows the filesystem to
do the stat() operations in parallel internally (which is a net win if
there are many servers involved) instead of serially as the application
would do.
Cheers, Andreas
PS - I changed the topic to separate this from the openfh() thread.
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the whole thing to the server and returns everything in
one shot. That would imply everything would be at least as up-to-date
as the opendir().
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is a pipe dream.
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that it is going to be
doing this (e.g. ls, GNU rm, find, etc) then why not let the filesystem
take advantage of this information? If combined with the statlite
interface, it can make a huge difference for clustered filesystems.
Cheers, Andreas
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welcome putting forth any NFS related ...
Strange, group is called HECIWG, website is hecewg?
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variables defined in only a subset
of the function. Could you verify with checkstack that this doesn't hit
here? Otherwise we need to move the common journal_head and buffer_head
allocations up to the main function declarations.
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for another
EA...
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pgpwmhI74h2Rc.pgp
Description: PGP signature
later (if the
VFS/VM doesn't discard the whole thing).
Cheers, Andreas
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pgpFS2T2LxOPJ.pgp
Description: PGP signature
);
+ put_filesystem(type);
+ return mnt;
+}
This will OOPS if fstype is bad, since you unconditionally put_filesystem()
on a possible PTR_ERR() type. You need an extra
if (!IS_ERR(type))
put_filesystem(type);
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, it might reduce the
CPU usage. Did you check that at all?
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an in-use filesystem is too twisted and dangerous, IMHO,
and a huge amount of effort for an extremely rare situation).
Cheers, Andreas
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Malcolm Beattie writes:
Andreas Dilger writes:
PS - I used to think shrinking a filesystem online was useful, but there
are a huge amount of problems with this and very few real-life
benefits, as long as you can at least do offline shrinking. With
proper LVM usage
a global search-and-replace
for all of the jfs_* functions, and rename them jbd_*, to avoid
conflicts with IBM JFS.
Cheers, Andreas
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owner.
Any chance that the machines have been cracked, and people are playing
games with the system? Unlikely, but possible.
Cheers, Andreas
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Andrew writes:
Andreas Dilger wrote:
I still don't agree. If they are contiguous in the file (even if
we have 32 filesystem blocks in a page, then we are still only
dirtying a limited number of indirect blocks (5). Yes, we can dirty
up to 32 block bitmaps, 32 group descriptors, and 32
could have corruption after a crash.
If they are not handled correctly, this would eventually this would lead
to overflows on a long-running filesystem and I doubt that happens.
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to only do 4kB block I/O on top of these devices
(not much of an issue for such large devices).
Still, this is just a stop-gap measure because next year people will want
16TB devices, and there won't be an easy way to do this.
Cheers, Andreas
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ion I have read about problems with clean shutdown of a subsystem
that is used for rootfs, and finitrd would be a nice way to do so,
if possible. Comments?
Cheers, Andreas
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Al writes:
On Thu, 22 Mar 2001, Andreas Dilger wrote:
I look forward to seeing the ext2 code. I was just in the process of
adding ioctls to ext3 to do online resizing within transactions. Maybe
I'll rather use this interface if it looks good. Will it work on 2.2,
or does it depend too
, Andreas
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? The one that calls the "read_super" method.
AFAICT, only the first mount calls down to the FS anyways (the rest
is VFS internal).
Cheers, Andreas
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Al, you write:
On Tue, 13 Mar 2001, Andreas Dilger wrote:
"/mnt" from the first mount. If it comes to the point where I can get
that, then I will start to worry about "mount --bind".
This is to store in the ext2 on-disk superblock, which is currently always
(from
E).
Would it be possible to put a valid vfsmnt pointer in kern_mnt for
non-FS_SINGLE filesystems? Would only the vfsmnt information (maybe
d_path(kern_mnt, kern_mnt-mnt_mountpoint, buf, buflen)) be enough
to determine the pathname of the filesystem mount point?
Cheers, Andreas
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Stephen, you write:
On Fri, Feb 23, 2001 at 01:20:40AM -0700, Andreas Dilger wrote:
At some time in the recent past, I was looking at the attribute checking
in ext2, and the following (ugly) piece of code didn't make sense.
ext2_notify_change isn't used in 2.4. It used to be unused
ck but you
know that someone will want to dereference it later anyways when it
is invalid.
Cheers, Andreas
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"class" (i.e. leading character) than other EAs. This was with the
intention of defining that class as "do not copy" when it became an issue.
This would solve the problem immediately.
Cheers, Andreas
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broken in other ways). Heinz
decided to update the IOP instead. Note that with the new library build,
it is possible to have multiple IOP tools installed at the same time, and
the correct ones are chosen at runtime based on the kernel IOP.
Cheers, Andreas
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because the layout of the filesystem itself hasn't really changed.
Note that you should build mke2fs on this older system, and it will turn
off the defaults for creating new filesystems with features enabled.
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descriptors per block */
unsigned long s_groups_count; /* Number of groups in the fs */
struct buffer_head * s_sbh; /* Buffer containing the super block */
@@ -57,9 +57,6 @@
int s_desc_per_block_bits;
int s_inode_size;
int s_first_ino;
- int
size of the device. With
something like LVM, there is no problem making a logical device of any
given size.
The journal will be identified in the filesystem by the journal_uuid, and
the journal will identify different client filesystems by the ext2 uuid.
Cheers, Andreas
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changes are bundled with the start of the truncate/unlink,
where the inode information is changed.
Cheers, Andreas
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for NFS exporting a cluster filesystem
are many - NFS clients are available for lots of platforms, some cluster
filesystems only work well tightly coupled, you want an HA NFS server,
you want an incrementally scalable NFS server, or some combination of these.
Cheers, Andreas
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