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2011-03-21ceph: rename dentry_release -> d_release, fix commentSage Weil1-7/+6
Just for consistency's sake. Fix obsolete comment too. Signed-off-by: Sage Weil <sage@newdream.net>
2011-03-21ceph: add ino32 mount optionYehuda Sadeh1-4/+7
The ino32 mount option forces the ceph fs to report 32 bit ino values. This is useful for 64 bit kernels with 32 bit userspace. Signed-off-by: Yehuda Sadeh <yehuda@hq.newdream.net>
2011-03-10ceph: fix d_revalidate oopsen on NFS exportsAl Viro1-1/+1
can't blindly check nd->flags in ->d_revalidate() Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-03-04ceph: no .snap inside of snapped namespaceSage Weil1-0/+1
Otherwise you can do things like # mkdir .snap/foo # cd .snap/foo/.snap # ls <badness> Signed-off-by: Sage Weil <sage@newdream.net>
2011-03-03ceph: do not clear I_COMPLETE from d_releaseSage Weil1-21/+1
First, this was racy anyway: d_release isn't called until well after the dentry is unhashed. Second, this runs afoul of the recent dcache change that clears d_parent prior to calling d_release (949854d0), causing a NULL pointer dereference. Signed-off-by: Sage Weil <sage@newdream.net>
2011-03-03ceph: do not set I_COMPLETESage Weil1-1/+1
Do not set the I_COMPLETE flag on directories until we resolve races with dcache pruning. Signed-off-by: Sage Weil <sage@newdream.net>
2011-03-03Revert "ceph: keep reference to parent inode on ceph_dentry"Sage Weil1-4/+1
This reverts commit 97d79b403ef03f729883246208ef5d8a2ebc4d68. This fails to account for d_parent changes due to rename or disconnected dentries due to submounts or NFS reexports. Signed-off-by: Sage Weil <sage@newdream.net>
2011-02-21Merge branch 'for-linus' of ↵Linus Torvalds1-1/+4
git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client: ceph: keep reference to parent inode on ceph_dentry ceph: queue cap_snaps once per realm libceph: fix socket write error handling libceph: fix socket read error handling
2011-02-19ceph: keep reference to parent inode on ceph_dentryYehuda Sadeh1-1/+4
When creating a new dentry we now hold a reference to the parent inode in the ceph_dentry. This is required due to the new RCU changes from 949854d0, which set dentry->d_parent to NULL in d_kill before calling the ->release() callback. If/when that behavior is changed, we can revert this hack. Signed-off-by: Yehuda Sadeh <yehuda@hq.newdream.net> Signed-off-by: Sage Weil <sage@newdream.net>
2011-01-13Merge branch 'for-linus' of ↵Linus Torvalds1-0/+20
git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client: rbd: fix cleanup when trying to mount inexistent image net/ceph: make ceph_msgr_wq non-reentrant ceph: fsc->*_wq's aren't used in memory reclaim path ceph: Always free allocated memory in osdmap_decode() ceph: Makefile: Remove unnessary code ceph: associate requests with opening sessions ceph: drop redundant r_mds field ceph: implement DIRLAYOUTHASH feature to get dir layout from MDS ceph: add dir_layout to inode
2011-01-12ceph: add dir_layout to inodeSage Weil1-0/+20
Add a ceph_dir_layout to the inode, and calculate dentry hash values based on the parent directory's specified dir_hash function. This is needed because the old default Linux dcache hash function is extremely week and leads to a poor distribution of files among dir fragments. Signed-off-by: Sage Weil <sage@newdream.net>
2011-01-07fs: rcu-walk aware d_revalidate methodNick Piggin1-1/+6
Require filesystems be aware of .d_revalidate being called in rcu-walk mode (nd->flags & LOOKUP_RCU). For now do a simple push down, returning -ECHILD from all implementations. Signed-off-by: Nick Piggin <npiggin@kernel.dk>
2011-01-07fs: dcache reduce branches in lookup pathNick Piggin1-3/+3
Reduce some branches and memory accesses in dcache lookup by adding dentry flags to indicate common d_ops are set, rather than having to check them. This saves a pointer memory access (dentry->d_op) in common path lookup situations, and saves another pointer load and branch in cases where we have d_op but not the particular operation. Patched with: git grep -E '[.>]([[:space:]])*d_op([[:space:]])*=' | xargs sed -e 's/\([^\t ]*\)->d_op = \(.*\);/d_set_d_op(\1, \2);/' -e 's/\([^\t ]*\)\.d_op = \(.*\);/d_set_d_op(\&\1, \2);/' -i Signed-off-by: Nick Piggin <npiggin@kernel.dk>
2011-01-07fs: dcache remove dcache_lockNick Piggin1-5/+1
dcache_lock no longer protects anything. remove it. Signed-off-by: Nick Piggin <npiggin@kernel.dk>
2011-01-07fs: dcache scale subdirsNick Piggin1-1/+5
Protect d_subdirs and d_child with d_lock, except in filesystems that aren't using dcache_lock for these anyway (eg. using i_mutex). Note: if we change the locking rule in future so that ->d_child protection is provided only with ->d_parent->d_lock, it may allow us to reduce some locking. But it would be an exception to an otherwise regular locking scheme, so we'd have to see some good results. Probably not worthwhile. Signed-off-by: Nick Piggin <npiggin@kernel.dk>
2011-01-07fs: dcache scale d_unhashedNick Piggin1-2/+3
Protect d_unhashed(dentry) condition with d_lock. This means keeping DCACHE_UNHASHED bit in synch with hash manipulations. Signed-off-by: Nick Piggin <npiggin@kernel.dk>
2011-01-07fs: dcache scale dentry refcountNick Piggin1-1/+3
Make d_count non-atomic and protect it with d_lock. This allows us to ensure a 0 refcount dentry remains 0 without dcache_lock. It is also fairly natural when we start protecting many other dentry members with d_lock. Signed-off-by: Nick Piggin <npiggin@kernel.dk>
2010-12-17ceph: fix null pointer dereference in ceph_init_dentry for nfs reexportSage Weil1-1/+2
The fh_to_dentry etc. methods use ceph_init_dentry(), which assumes that d_parent is defined. It isn't for those callers, so check! Signed-off-by: Sage Weil <sage@newdream.net>
2010-12-01ceph: avoid possible null deref in readdir after dir llseekSage Weil1-2/+2
last may be NULL, but we dereference it in the else branch without checking. Normally it doesn't trigger because last == NULL when fpos == 2, but it could happen on a newly opened dir if the user seeks forward. Reported-by: Dan Carpenter <error27@gmail.com> Signed-off-by: Sage Weil <sage@newdream.net>
2010-11-18ceph: fix readdir EOVERFLOW on 32-bit archsSage Weil1-3/+7
One of the readdir filldir_t callers was passing the raw ceph 64-bit ino instead of the hashed 32-bit one, producing an EOVERFLOW in the filler callback. Fix this by calling the ceph_vino_to_ino() helper to do the conversion. Reported-by: Jan Smets <jan.smets@alcatel-lucent.com> Tested-by: Jan Smets <jan.smets@alcatel-lucent.com> Signed-off-by: Sage Weil <sage@newdream.net>
2010-11-11ceph: fix frag offset for non-leftmost fragsSage Weil1-1/+4
We start at offset 2 for the leftmost frag, and 0 for subsequent frags. When we reach the end (rightmost), we go back to 2. This fixes readdir on fragmented (large) directories. Signed-off-by: Sage Weil <sage@newdream.net>
2010-11-11ceph: fix dangling pointerSage Weil1-0/+1
Clear fi->last_name when it's freed. The only caller is rewinddir() (or equivalent lseek). Signed-off-by: Sage Weil <sage@newdream.net>
2010-10-20ceph: do not carry i_lock for readdir from dcacheSage Weil1-25/+16
We were taking dcache_lock inside of i_lock, which introduces a dependency not found elsewhere in the kernel, complicationg the vfs locking scalability work. Since we don't actually need it here anyway, remove it. We only need i_lock to test for the I_COMPLETE flag, so be careful to do so without dcache_lock held. Signed-off-by: Sage Weil <sage@newdream.net>
2010-10-20ceph: do not hide .snap in root directorySage Weil1-1/+0
Snaps in the root directory are now supported by the MDS, and harmless on older versions. Signed-off-by: Sage Weil <sage@newdream.net>
2010-10-20ceph: factor out libceph from Ceph file systemYehuda Sadeh1-27/+28
This factors out protocol and low-level storage parts of ceph into a separate libceph module living in net/ceph and include/linux/ceph. This is mostly a matter of moving files around. However, a few key pieces of the interface change as well: - ceph_client becomes ceph_fs_client and ceph_client, where the latter captures the mon and osd clients, and the fs_client gets the mds client and file system specific pieces. - Mount option parsing and debugfs setup is correspondingly broken into two pieces. - The mon client gets a generic handler callback for otherwise unknown messages (mds map, in this case). - The basic supported/required feature bits can be expanded (and are by ceph_fs_client). No functional change, aside from some subtle error handling cases that got cleaned up in the refactoring process. Signed-off-by: Sage Weil <sage@newdream.net>
2010-09-11ceph: fix null pointer deref on anon root dentry releaseSage Weil1-3/+7
When we release a root dentry, particularly after a splice, the parent (actually our) inode was evaluating to NULL and was getting dereferenced by ceph_snap(). This is reproduced by something as simple as mount -t ceph monhost:/a/b mnt mount -t ceph monhost:/a mnt2 ls mnt2 A splice_dentry() would kill the old 'b' inode's root dentry, and we'd crash while releasing it. Fix by checking for both the ROOT and NULL cases explicitly. We only need to invalidate the parent dir when we have a correct parent to invalidate. Signed-off-by: Sage Weil <sage@newdream.net>
2010-08-24ceph: initialize fields on new dentry_infosSage Weil1-1/+1
Signed-off-by: Sage Weil <sage@newdream.net>
2010-08-03ceph: constify dentry_operationsSage Weil1-4/+4
This makes checkpatch happy. Signed-off-by: Sage Weil <sage@newdream.net>
2010-08-01ceph: code cleanupYehuda Sadeh1-0/+2
Mainly fixing minor issues reported by sparse. Signed-off-by: Yehuda Sadeh <yehuda@hq.newdream.net> Signed-off-by: Sage Weil <sage@newdream.net>
2010-07-23ceph: fix d_release dop for snapdir, snapped dentriesSage Weil1-3/+9
We need to set the d_release dop for snapdir and snapped dentries so that the ceph_dentry_info struct gets released. We also use the dcache to cache readdir results when possible, which only works if we know when dentries are dropped from the cache. Since we don't use the dcache for readdir in the hidden snapdir, avoid that case in ceph_dentry_release. Signed-off-by: Sage Weil <sage@newdream.net>
2010-07-22ceph: avoid dcache readdir for snapdirSage Weil1-0/+1
We should always go to the MDS for readdir on the hidden snapdir. The set of snapshots can change at any time; the client can't trust its cache for that. Signed-off-by: Sage Weil <sage@newdream.net>
2010-05-30Merge branch 'for-linus' of ↵Linus Torvalds1-1/+1
git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client: ceph: clean up on forwarded aborted mds request ceph: fix leak of osd authorizer ceph: close out mds, osd connections before stopping auth ceph: make lease code DN specific fs/ceph: Use ERR_CAST ceph: renew auth tickets before they expire ceph: do not resend mon requests on auth ticket renewal ceph: removed duplicated #includes ceph: avoid possible null dereference ceph: make mds requests killable, not interruptible sched: add wait_for_completion_killable_timeout
2010-05-29fs/ceph: Use ERR_CASTJulia Lawall1-1/+1
Use ERR_CAST(x) rather than ERR_PTR(PTR_ERR(x)). The former makes more clear what is the purpose of the operation, which otherwise looks like a no-op. In the case of fs/ceph/inode.c, ERR_CAST is not needed, because the type of the returned value is the same as the type of the enclosing function. The semantic patch that makes this change is as follows: (http://coccinelle.lip6.fr/) // <smpl> @@ type T; T x; identifier f; @@ T f (...) { <+... - ERR_PTR(PTR_ERR(x)) + x ...+> } @@ expression x; @@ - ERR_PTR(PTR_ERR(x)) + ERR_CAST(x) // </smpl> Signed-off-by: Julia Lawall <julia@diku.dk> Signed-off-by: Sage Weil <sage@newdream.net>
2010-05-27drop unused dentry argument to ->fsyncChristoph Hellwig1-3/+2
Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2010-05-17ceph: specify max_bytes on readdir repliesSage Weil1-0/+2
Specify max bytes in request to bound size of reply. Add associated mount option with default value of 512 KB. Signed-off-by: Sage Weil <sage@newdream.net>
2010-05-17ceph: set dn offset when splicedSage Weil1-6/+7
We want to assign an offset when the dentry goes from null to linked, which is always done by splice_dentry(). Notably, we should NOT assign an offset when a dentry is first created and is still null. BUG if we try to splice a non-null dentry (we shouldn't). Signed-off-by: Sage Weil <sage@newdream.net>
2010-05-17ceph: set next_offset on readdir finishSage Weil1-1/+1
Set next_offset to 2 (always 2!), not 0, on readdir finish. Signed-off-by: Sage Weil <sage@newdream.net>
2010-05-17ceph: fix memory leak due to possible dentry init raceSage Weil1-1/+4
Free dentry_info in error path. Signed-off-by: Sage Weil <sage@newdream.net>
2010-05-17ceph: use ceph_sb_to_client instead of ceph_clientCheng Renquan1-5/+5
ceph_sb_to_client and ceph_client are really identical, we need to dump one; while function ceph_client is confusing with "struct ceph_client", ceph_sb_to_client's definition is more clear; so we'd better switch all call to ceph_sb_to_client. -static inline struct ceph_client *ceph_client(struct super_block *sb) -{ - return sb->s_fs_info; -} Signed-off-by: Cheng Renquan <crquan@gmail.com> Signed-off-by: Sage Weil <sage@newdream.net>
2010-05-17ceph: invalidate affected dentry leases on aborted requestsSage Weil1-2/+11
If we abort a request, we return to caller, but the request may still complete. And if we hold the dir FILE_EXCL bit, we may not release a lease when sending a request. A simple un-tar, control-c, un-tar again will reproduce the bug (manifested as a 'Cannot open: File exists'). Ensure we invalidate affected dentry leases (as well dir I_COMPLETE) so we don't have valid (but incorrect) leases. Do the same, consistently, at other sites where I_COMPLETE is similarly cleared. Signed-off-by: Sage Weil <sage@newdream.net>
2010-05-03ceph: clear dir complete, invalidate dentry on replayed renameSage Weil1-0/+9
If a rename operation is resent to the MDS following an MDS restart, the client does not get a full reply (containing the resulting metadata) back. In that case, a ceph_rename() needs to compensate by doing anything useful that fill_inode() would have, like d_move(). It also needs to invalidate the dentry (to workaround the vfs_rename_dir() bug) and clear the dir complete flag, just like fill_trace(). Signed-off-by: Sage Weil <sage@newdream.net>
2010-04-14Merge branch 'for-linus' of ↵Linus Torvalds1-3/+4
git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client: ceph: use separate class for ceph sockets' sk_lock ceph: reserve one more caps space when doing readdir ceph: queue_cap_snap should always queue dirty context ceph: fix dentry reference leak in dcache readdir ceph: decode v5 of osdmap (pool names) [protocol change] ceph: fix ack counter reset on connection reset ceph: fix leaked inode ref due to snap metadata writeback race ceph: fix snap context reference leaks ceph: allow writeback of snapped pages older than 'oldest' snapc ceph: fix dentry rehashing on virtual .snap dir
2010-04-13ceph: reserve one more caps space when doing readdirYehuda Sadeh1-1/+1
We were missing space for the directory cap. The result was a BUG at fs/ceph/caps.c:2178. Signed-off-by: Yehuda Sadeh <yehuda@hq.newdream.net> Signed-off-by: Sage Weil <sage@newdream.net>
2010-04-12ceph: fix dentry reference leak in dcache readdirSage Weil1-2/+2
When filldir returned an error (e.g. buffer full for a large directory), we would leak a dentry reference, causing an oops on umount. Signed-off-by: Sage Weil <sage@newdream.net>
2010-03-30ceph: fix dentry rehashing on virtual .snap dirSage Weil1-0/+1
If a lookup fails on the magic .snap directory, we bind it to a magic snap directory inode in ceph_lookup_finish(). That code assumes the dentry is unhashed, but a recent server-side change started returning NULL leases on lookup failure, causing the .snap dentry to be hashed and NULL by ceph_fill_trace(). This causes dentry hash chain corruption, or a dies when d_rehash() includes BUG_ON(!d_unhashed(entry)); So, avoid processing the NULL dentry lease if it the dentry matches the snapdir name in ceph_fill_trace(). That allows the lookup completion to properly bind it to the snapdir inode. BUG there if dentry is hashed to be sure. Signed-off-by: Sage Weil <sage@newdream.net>
2010-03-30include cleanup: Update gfp.h and slab.h includes to prepare for breaking ↵Tejun Heo1-0/+1
implicit slab.h inclusion from percpu.h percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-23ceph: fix possible double-free of mds request referenceSage Weil1-1/+3
Clear pointer to mds request after dropping the reference to ensure we don't drop it again, as there is at least one error path through this function that does not reset fi->last_readdir to a new value. Signed-off-by: Sage Weil <sage@newdream.net>
2009-12-23ceph: add feature bits to connection handshake (protocol change)Sage Weil1-6/+6
Define supported and required feature set. Fail connection if the server requires features we do not support (TAG_FEATURES), or if the server does not support features we require. Signed-off-by: Sage Weil <sage@newdream.net>
2009-12-21ceph: do not drop lease during revalidateSage Weil1-2/+0
We need to hold session s_mutex for __ceph_mdsc_drop_dentry_lease(), which we don't, so skip it. It was purely an optimization. Signed-off-by: Sage Weil <sage@newdream.net>
2009-12-03ceph: hide /.ceph from readdir resultsSage Weil1-0/+8
We need to skip /.ceph in (cached) readdir results, and exclude "/.ceph" from the cached ENOENT lookup check. Signed-off-by: Sage Weil <sage@newdream.net>
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