character, and PUFFS do not want it. This fixes this bug, that returned
stat the informations for x instead of reporting ENOENT:
mkdir x && ln x z && stat -x z/whatever/you/want
- Keep track of file name to avoid lookups when we can. This makes sure we
do not have two cookies for the same inode, a situation that cause wreak
havoc when we come to remove or rename a node.
- Do not use PUFFS_FLAG_BUILDPATH at all, since we now track file names
- In open, queue requests after checking for access, as there is no merit
to queue a will-be-denied request while we can deny it immediatly
- request reclaim of removed nodes at inactive stage
- Restore open on our own in fsycn and readdir, as the node may not already
be open, and FUSE really wants it to be. No need to close immediatly, it
can be done at inactive time.
= Write operations =
- fix a nasty bug that corrupted files on write (written added twice)
- Keep track of file size in order to honour PUFFS_IO_APPEND
= many fixes in rename =
- handler overwritten nodes correctly
- wait for all operations on the node to drain before doing rename, as
filesystems may not cope with operations on a moving file.
- setback PUFFS_SETBACK_INACT_N1 cannot be used from rename, we therefore
miss the inactive time for an overwritten node. This bounds us to give up
PUFFS_KFLAG_IAONDEMAND.
= Removed files =
- forbid most operations on a removed node, return ENOENT
- setback PUFFS_SETBACK_NOREF_N1 at inactive stage to cause removed
file reclaim
= Misc =
- Update outdated ARGSUSED for lint
- Fix a memory leak (puffs_pn_remove instead of puffs_pn_put)
- Do not use PUFFS_FLAG_BUILDPATH except for debug output. It makes the
lookup code much simplier.
- use PUFFS_KFLAG_WTCACHE to puffs_init so that all writes are
immediatly send to the filesystem, and we do not have anymore write
after inactive. As a consequence, we can close files at inactive
stage, and there is not any concern left with files opened at
create time. We also do not have anymore to open ourselves in readdir and
fsync.
- Fsync on close (inactive stage). That makes sure we will not need to
do these operations once the file is closed (FUSE want an open file).
short sircuit the request that come after the close, bu not fsinc'ing
closed files,
- Use PUFFS_KFLAG_IAONDEMAND to get less inactive calls
== Removed nodes ==
- more ENOENT retunred for operations on removed node (but there
are probably some still missing): getattr, ooen, setattr, fsync
- set PND_REMOVE before sending the UNLINK/RMDIR operations so that we avoid
races during UNLINK completion. Also set PND_REMOVED on node we overwirte
in rename
== Filehandle fixes ==
- queue open operation to avoid getting two fh for one file
- set FH in getattr, if the file is open
- Just requires a read FH for fsyncdir, as we always opendir in read
mode. Ok, this is misleading :-)
== Misc ==
- do not set FUSE_FATTR_ATIME_NOW in setattr, as we provide the time
- short circuit nilpotent operations in setattr
- add a filename diagnostic flag to dump file names
SOCK_DGRAM, we can send many pages at once without hitting any bug
- when creating a file, it is open for FUSE, but not for the kernel.
If the kernel does not do a subsequent open, we have a leak. We fight
against this by trying to close such file that the kernel left unopen
for some time.
- some code refactoring to make message exchange debug easier (more to come)
assume datagram semantics: when using SOCK_STREAM, if perfused sends
frames faster than the filesystem consumes them, it will grab multiple
frames at once and discard anything beyond the first one. For now the
code can work both with SOCK_DGRAM and SOCK_STREAM, but SOCK_STREAM
support will probably have to be removed for the sake of readability.
- Remeber to sync parent directories when moving a node
- In debug output, display the requeue type (readdir, write, etc...)
- directories can be open R/W (for FSYNCDIR)
- do not skip calls to FSYNC or FSYNCDIR if the filesystem returned ENOSYS:
it may change its mind, and it may also actually do something when retunring
ENOSYS
- When FSYNC and FSYNCDIR return ENOSYS, do not report it to kernel (silent
failure)
therefore runs with filesystem privileges
- shut up warnings and debug messages when perfused is autostarted
- make perfused patch modifiable with CFLAGS for easier pkgsrc integration
- Fix build warnings
- after a node is deleted, some operations should return ENOENT, some
should be ignored. Fixed it for ACCESS, SETATTR and GETATTR. Other
operation may also need a fix.
- At reclaim time, there is no need to wait for READDIR and READ
completion, since the caller will never close a file before getting
readir() and read() replies. Waiting for WRITE completion is still
mandatory, but we must ensure that no queued WRITE is awaiting to
be scheduled. Once the queue is drained, we must check that the
reclaim operation was not canceled by a new file LOOKUP.
- At reclaim time, fixed a mix up between read and write fh to close
- Fixed permission checks for RENAME (it tested the node itself
instead of the source)
- When seting file mode, only MKNOD needs the filetype (S_* fields).
It is probably a bug to set it for other operations.
setattr(mtime, ctime) after close, while FUSE expects the file
to be open for these operations
- remove unused argument to node_mk_common()
- remove requeued requests when they are executed, not when they
are tagged for schedule
- try to make filehandle management simplier, by keeping track of only
one read and one write filehandle (the latter being really read/write).
- when CREATE is not available, we use the MKNOD/OPEN path. Fix a
bug here where we opened the parent directory instead of the node:
add the missing lookup of the mknod'ed node.
- lookup file we just created: glusterfs does not really see them
otherwise.
- open file when doing setattr(mtime, ctime) on non open files, as
some filesystems seems to require it.
- Do not flush pagecache for removed nodes
- Keep track of read/write operations in progress, and at reclaim
time, make sure they are over before closing and forgeting the file.
FUSE filesystems will attempt to start it on their own, and will
communicate using a socketpair
- do not advertise NULL file handle as being valid when sending themback to the FUSE filesystem.
- unmount if we cannot talk to the FUSE process anymore
- set calling process gid properly
- debug message cleanup
- Automatically call fsync on close for files. If we just close, fsync
will come later and we will have to reopen
- Add a PND_DIRTY flag to keep track of files that really need a sync.
perfuse_node_fsync only calls the FUSE fsync method if there are data
to push.
- Add a PND_OPEN flag to keep track of open files. Checking non NULL
fh is not enough, as some filesystems will always set fh to 0.
- Add a sync diagnostic flag, to watch fsync and dirty flag activity.
Make the fh diagnostic flag more verbose
- Send the fh in setattr (it was hardcoded to 0)
I am now able to build libperfuse in a glusterfs mounted filesystem. Yeah!
FUSE filesystem must be patched to #include <perfuse.h> in the source
files that open /dev/fuse and perform the mount(2) system call. The
FUSE filesystem must be linked with -lperfuse.
libperfuse(3) implements the FUSE kernel interface, on which libfuse or
any FUSE filesystem that opens /dev/fuse directly can be used.
For now, an external daemon called perfused(8) is used. This may change
in the future.
