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* ceph: make ceph_forget_all_cached_acls() static inlineGuangliang Zhao2014-02-172-6/+6
| | | | | | Signed-off-by: Guangliang Zhao <lucienchao@gmail.com> Reviewed-by: Alex Elder <elder@linaro.org> Signed-off-by: Sage Weil <sage@inktank.com>
* ceph: add missing init_acl() for mkdir() and atomic_open()Yan, Zheng2014-02-172-5/+9
| | | | Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com>
* ceph: fix ceph_set_acl()Yan, Zheng2014-02-171-5/+1
| | | | | | | | | If acl is equivalent to file mode permission bits, ceph_set_acl() needs to remove any existing acl xattr. Use __ceph_setxattr() to handle both setting and removing acl xattr cases, it doesn't return -ENODATA when there is no acl xattr. Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com>
* ceph: fix ceph_removexattr()Yan, Zheng2014-02-171-1/+1
| | | | Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com>
* ceph: remove xattr when null value is given to setxattr()Yan, Zheng2014-02-171-2/+14
| | | | | | | For the setxattr request, introduce a new flag CEPH_XATTR_REMOVE to distinguish null value case from the zero-length value case. Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com>
* ceph: properly handle XATTR_CREATE and XATTR_REPLACEYan, Zheng2014-02-171-12/+26
| | | | | | | return -EEXIST if XATTR_CREATE is set and xattr alread exists. return -ENODATA if XATTR_REPLACE is set but xattr does not exist. Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com>
* ceph: fix missing dput in ceph_set_aclSage Weil2014-01-311-3/+6
| | | | | | | | | | | | | Add matching dput() for d_find_alias(). Move d_find_alias() down a bit at Julia's suggestion. [ Introduced by commit 72466d0b92e0: "ceph: fix posix ACL hooks" ] Reported-by: Fengguang Wu <fengguang.wu@intel.com> Reported-by: Julia Lawall <julia.lawall@lip6.fr> Signed-off-by: Sage Weil <sage@inktank.com> Reviewed-by: Ilya Dryomov <ilya.dryomov@inktank.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* ceph: simplify ceph_{get,init}_aclChristoph Hellwig2014-01-301-40/+16
| | | | | | | | | | | - ->get_acl only gets called after we checked for a cached ACL, so no need to call get_cached_acl again. - no need to check IS_POSIXACL in ->get_acl, without that it should never get set as all the callers that set it already have the check. - you should be able to use the full posix_acl_create in CEPH Signed-off-by: Christoph Hellwig <hch@infradead.org> Signed-off-by: Sage Weil <sage@inktank.com>
* ceph: remove duplicate declaration of ceph_setattrPeter Rosin2014-01-301-1/+0
| | | | | Signed-off-by: Peter Rosin <peda@lysator.liu.se> Signed-off-by: Sage Weil <sage@inktank.com>
* ceph: fix posix ACL hooksSage Weil2014-01-294-5/+10
| | | | | | | | | | | | | | | The merge of commit 7221fe4c2ed7 ("ceph: add acl for cephfs") raced with upstream changes in the generic POSIX ACL code (eg commit 2aeccbe957d0 "fs: add generic xattr_acl handlers" and others). Some of the fallout was fixed in commit 4db658ea0ca ("ceph: Fix up after semantic merge conflict"), but it was incomplete: the set_acl inode_operation wasn't getting set, and the prototype needed to be adjusted a bit (it doesn't take a dentry anymore). Signed-off-by: Sage Weil <sage@inktank.com> Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* ceph: Fix up after semantic merge conflictLinus Torvalds2014-01-284-108/+6
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The previous ceph-client merge resulted in ceph not even building, because there was a merge conflict that wasn't visible as an actual data conflict: commit 7221fe4c2ed7 ("ceph: add acl for cephfs") added support for POSIX ACL's into Ceph, but unluckily we also had the VFS tree change a lot of the POSIX ACL helper functions to be much more helpful to filesystems (see for example commits 2aeccbe957d0 "fs: add generic xattr_acl handlers", 5bf3258fd2ac "fs: make posix_acl_chmod more useful" and 37bc15392a23 "fs: make posix_acl_create more useful") The reason this conflict wasn't obvious was many-fold: because it was a semantic conflict rather than a data conflict, it wasn't visible in the git merge as a conflict. And because the VFS tree hadn't been in linux-next, people hadn't become aware of it that way. And because I was at jury duty this morning, I was using my laptop and as a result not doing constant "allmodconfig" builds. Anyway, this fixes the build and generally removes a fair chunk of the Ceph POSIX ACL support code, since the improved helpers seem to match really well for Ceph too. But I don't actually have any way to *test* the end result, and I was really hoping for some ACK's for this. Oh, well. Not compiling certainly doesn't make things easier to test, so I'm committing this without the acks after having waited for four hours... Plus it's what I would have done for the merge had I noticed the semantic conflict.. Reported-by: Dave Jones <davej@redhat.com> Cc: Sage Weil <sage@inktank.com> Cc: Guangliang Zhao <lucienchao@gmail.com> Cc: Li Wang <li.wang@ubuntykylin.com> Cc: Christoph Hellwig <hch@infradead.org> Cc: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* ceph: cast PAGE_SIZE to size_t in ceph_sync_write()Ilya Dryomov2014-01-281-1/+1
| | | | | | | | | Use min_t(size_t, ...) instead of plain min(), which does strict type checking, to avoid compile warning on i386. Cc: Jianpeng Ma <majianpeng@gmail.com> Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com> Reviewed-by: Sage Weil <sage@inktank.com>
* ceph: fix dout() compile warnings in ceph_filemap_fault()Ilya Dryomov2014-01-281-3/+3
| | | | | | | | | | | PAGE_CACHE_SIZE is unsigned long on all architectures, however size_t is either unsigned int or unsigned long. Rather than change format strings, cast PAGE_CACHE_SIZE to size_t to be in line with dout()s in ceph_page_mkwrite(). Cc: Yan, Zheng <zheng.z.yan@intel.com> Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com> Reviewed-by: Sage Weil <sage@inktank.com>
* libceph: replace ceph_calc_ceph_pg() with ceph_oloc_oid_to_pg()Ilya Dryomov2014-01-271-2/+6
| | | | | | | | Switch ceph_calc_ceph_pg() to new oloc and oid abstractions and rename it to ceph_oloc_oid_to_pg() to make its purpose more clear. Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com> Reviewed-by: Sage Weil <sage@inktank.com>
* ceph: add imported caps when handling cap export messageYan, Zheng2014-01-213-82/+146
| | | | | | | | | | | Version 3 cap export message includes information about the imported caps. It allows us to add the imported caps if the corresponding cap import message still hasn't been received. This allow us to handle situation that the importer MDS crashes and the cap import message is missing. Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com>
* ceph: add open export target session helperYan, Zheng2014-01-212-15/+38
| | | | Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com>
* ceph: remove exported caps when handling cap import messageYan, Zheng2014-01-211-27/+52
| | | | | | | | | | | Version 3 cap import message includes the ID of the exported caps. It allow us to remove the exported caps if we still haven't received the corresponding cap export message. We remove the exported caps because they are stale, keeping them can compromise consistence. Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com>
* ceph: handle session flush messageYan, Zheng2014-01-212-0/+21
| | | | Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com>
* ceph: check inode caps in ceph_d_revalidateYan, Zheng2014-01-213-3/+21
| | | | | | | | | Some inodes in readdir reply may have no caps. Getattr mds request for these inodes can return -ESTALE. The fix is consider dentry that links to inode with no caps as invalid. Invalid dentry causes a lookup request to send to the mds, the MDS will send caps back. Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com>
* ceph: handle -ESTALE replyYan, Zheng2014-01-211-20/+11
| | | | | | | | | Send requests that operate on path to directory's auth MDS if mode == USE_AUTH_MDS. Always retry using the auth MDS if got -ESTALE reply from non-auth MDS. Also clean up the code that handles auth MDS change. Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com>
* ceph: fix trim capsYan, Zheng2014-01-211-6/+11
| | | | | | | | - don't trim auth cap if there are flusing caps - don't trim auth cap if any 'write' cap is wanted - allow trimming non-auth cap even if the inode is dirty Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com>
* ceph: fix cache revoke raceYan, Zheng2014-01-213-4/+8
| | | | | | | | | | | | handle following sequence of events: - non-auth MDS revokes Fc cap. queue invalidate work - auth MDS issues Fc cap through request reply. i_rdcache_gen gets increased. - invalidate work runs. it finds i_rdcache_revoking != i_rdcache_gen, so it does nothing. Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com>
* ceph: use ceph_seq_cmp() to compare migrate_seqYan, Zheng2014-01-211-1/+1
| | | | Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com>
* ceph: handle cap export race in try_flush_caps()Yan, Zheng2014-01-211-8/+8
| | | | | | auth cap may change after releasing the i_ceph_lock Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com>
* ceph: trivial comment fixJ. Bruce Fields2014-01-161-3/+3
| | | | | | | | "disconnected" is too easily confused with "DCACHE_DISCONNECTED". I think "unhashed" is the more precise term here. Signed-off-by: J. Bruce Fields <bfields@redhat.com> Reviewed-by: Sage Weil <sage@inktank.com>
* libceph: all features fields must be u64Ilya Dryomov2013-12-312-9/+9
| | | | | | | | | In preparation for ceph_features.h update, change all features fields from unsigned int/u32 to u64. (ceph.git has ~40 feature bits at this point.) Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com> Reviewed-by: Sage Weil <sage@inktank.com>
* ceph fscache: Uncaching no data page from fscache in readpage()Li Wang2013-12-311-0/+1
| | | | | | | | | Currently, if one new page allocated into fscache in readpage(), however, with no data read into due to error encountered during reading from OSDs, the slot in fscache is not uncached. This patch fixes this. Signed-off-by: Li Wang <liwang@ubuntukylin.com> Reviewed-by: Milosz Tanski <milosz@adfin.com>
* ceph fscache: Introduce a routine for uncaching single no data page from fscacheLi Wang2013-12-311-0/+13
| | | | | Signed-off-by: Li Wang <liwang@ubuntukylin.com> Reviewed-by: Milosz Tanski <milosz@adfin.com>
* ceph: add acl for cephfsGuangliang Zhao2013-12-319-13/+451
| | | | | | Signed-off-by: Guangliang Zhao <lucienchao@gmail.com> Reviewed-by: Li Wang <li.wang@ubuntykylin.com> Reviewed-by: Zheng Yan <zheng.z.yan@intel.com>
* ceph: check caps in filemap_fault and page_mkwriteYan, Zheng2013-12-311-12/+77
| | | | | | | | | | Adds cap check to the page fault handler. The check prevents page fault handler from adding new page to the page cache while Fcb caps are being revoked. This solves Fc revoking hang in multiple clients mmap IO workload. Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com> Reviewed-by: Sage Weil <sage@inktank.com>
* fs: ceph: new helper: file_inode(file)Libo Chen2013-12-131-1/+1
| | | | | Signed-off-by: Libo Chen <clbchenlibo.chen@huawei.com> Signed-off-by: Sage Weil <sage@inktank.com>
* ceph: Clean up if error occurred in finish_read()Li Wang2013-12-131-0/+3
| | | | | | | | Clean up if error occurred rather than going through normal process Signed-off-by: Li Wang <liwang@ubuntukylin.com> Signed-off-by: Yunchuan Wen <yunchuanwen@ubuntukylin.com> Signed-off-by: Sage Weil <sage@inktank.com>
* ceph: implement readv/preadv for sync operationmajianpeng2013-12-131-46/+116
| | | | | | | | For readv/preadv sync-operatoin, ceph only do the first iov. Now implement this. Signed-off-by: Jianpeng Ma <majianpeng@gmail.com> Reviewed-by: Yan, Zheng <zheng.z.yan@intel.com>
* ceph: Implement writev/pwritev for sync operation.majianpeng2013-12-131-80/+193
| | | | | | | | | | | | | For writev/pwritev sync-operatoin, ceph only do the first iov. I divided the write-sync-operation into two functions. One for direct-write, other for none-direct-sync-write. This is because for none-direct-sync-write we can merge iovs to one. But for direct-write, we can't merge iovs. Signed-off-by: Jianpeng Ma <majianpeng@gmail.com> Reviewed-by: Yan, Zheng <zheng.z.yan@intel.com> Signed-off-by: Sage Weil <sage@inktank.com>
* ceph: drop unconnected inodesYan, Zheng2013-12-133-0/+12
| | | | | | | | Positve dentry and corresponding inode are always accompanied in MDS reply. So no need to keep inode in the cache after dropping all its aliases. Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com> Reviewed-by: Sage Weil <sage@inktank.com>
* ceph: Avoid data inconsistency due to d-cache aliasing in readpage()Li Wang2013-12-131-2/+6
| | | | | | | | | | If the length of data to be read in readpage() is exactly PAGE_CACHE_SIZE, the original code does not flush d-cache for data consistency after finishing reading. This patches fixes this. Signed-off-by: Li Wang <liwang@ubuntukylin.com> Signed-off-by: Sage Weil <sage@inktank.com>
* ceph: initialize inode before instantiating dentryYan, Zheng2013-12-131-78/+58
| | | | | | | | | | | commit b18825a7c8 (Put a small type field into struct dentry::d_flags) put a type field into struct dentry::d_flags. __d_instantiate() set the field by checking inode->i_mode. So we should initialize inode before instantiating dentry when handling mds reply. Fixes: http://tracker.ceph.com/issues/6930 Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com> Reviewed-by: Sage Weil <sage@inktank.com>
* Merge branch 'for-linus-bugs' of ↵Linus Torvalds2013-11-268-41/+121
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client Pull ceph bug-fixes from Sage Weil: "These include a couple fixes to the new fscache code that went in during the last cycle (which will need to go stable@ shortly as well), a couple client-side directory fragmentation fixes, a fix for a race in the cap release queuing path, and a couple race fixes in the request abort and resend code. Obviously some of this could have gone into 3.12 final, but I preferred to overtest rather than send things in for a late -rc, and then my travel schedule intervened" * 'for-linus-bugs' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client: ceph: allocate non-zero page to fscache in readpage() ceph: wake up 'safe' waiters when unregistering request ceph: cleanup aborted requests when re-sending requests. ceph: handle race between cap reconnect and cap release ceph: set caps count after composing cap reconnect message ceph: queue cap release in __ceph_remove_cap() ceph: handle frag mismatch between readdir request and reply ceph: remove outdated frag information ceph: hung on ceph fscache invalidate in some cases
| * ceph: allocate non-zero page to fscache in readpage()Li Wang2013-11-231-1/+1
| | | | | | | | | | | | | | | | | | | | ceph_osdc_readpages() returns number of bytes read, currently, the code only allocate full-zero page into fscache, this patch fixes this. Signed-off-by: Li Wang <liwang@ubuntukylin.com> Reviewed-by: Milosz Tanski <milosz@adfin.com> Reviewed-by: Sage Weil <sage@inktank.com>
| * ceph: wake up 'safe' waiters when unregistering requestYan, Zheng2013-11-231-1/+2
| | | | | | | | | | | | | | | | We also need to wake up 'safe' waiters if error occurs or request aborted. Otherwise sync(2)/fsync(2) may hang forever. Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com> Signed-off-by: Sage Weil <sage@inktank.com>
| * ceph: cleanup aborted requests when re-sending requests.Yan, Zheng2013-11-231-1/+4
| | | | | | | | | | | | | | | | | | | | Aborted requests usually get cleared when the reply is received. If MDS crashes, no reply will be received. So we need to cleanup aborted requests when re-sending requests. Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com> Reviewed-by: Greg Farnum <greg@inktank.com> Signed-off-by: Sage Weil <sage@inktank.com>
| * ceph: handle race between cap reconnect and cap releaseYan, Zheng2013-11-233-4/+26
| | | | | | | | | | | | | | | | | | When a cap get released while composing the cap reconnect message. We should skip queuing the release message if the cap hasn't been added to the cap reconnect message. Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com> Reviewed-by: Sage Weil <sage@inktank.com>
| * ceph: set caps count after composing cap reconnect messageYan, Zheng2013-11-231-5/+18
| | | | | | | | | | | | | | | | It's possible that some caps get released while composing the cap reconnect message. Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com> Reviewed-by: Sage Weil <sage@inktank.com>
| * ceph: queue cap release in __ceph_remove_cap()Yan, Zheng2013-11-233-21/+14
| | | | | | | | | | | | | | | | call __queue_cap_release() in __ceph_remove_cap(), this avoids acquiring s_cap_lock twice. Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com> Reviewed-by: Sage Weil <sage@inktank.com>
| * ceph: handle frag mismatch between readdir request and replyYan, Zheng2013-09-303-5/+25
| | | | | | | | | | | | | | | | | | | | | | If client has outdated directory fragments information, it may request readdir an non-existent directory fragment. In this case, the MDS finds an approximate directory fragment and sends its contents back to the client. When receiving a reply with fragment that is different than the requested one, the client need to reset the 'readdir offset'. Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com> Reviewed-by: Sage Weil <sage@inktank.com>
| * ceph: remove outdated frag informationYan, Zheng2013-09-301-4/+29
| | | | | | | | | | | | | | | | | | If directory fragments change, fill_inode() inserts new frags into the fragtree, but it does not remove outdated frags from the fragtree. This patch fixes it. Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com> Reviewed-by: Sage Weil <sage@inktank.com>
| * ceph: hung on ceph fscache invalidate in some casesMilosz Tanski2013-09-251-0/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | In some cases I'm on my ceph client cluster I'm seeing hunk kernel tasks in the invalidate page code path. This is due to the fact that we don't check if the page is marked as cache before calling fscache_wait_on_page_write(). This is the log from the hang INFO: task XXXXXX:12034 blocked for more than 120 seconds. "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. ... Call Trace: [<ffffffff81568d09>] schedule+0x29/0x70 [<ffffffffa01d4cbd>] __fscache_wait_on_page_write+0x6d/0xb0 [fscache] [<ffffffff81083520>] ? add_wait_queue+0x60/0x60 [<ffffffffa029a3e9>] ceph_invalidate_fscache_page+0x29/0x50 [ceph] [<ffffffffa027df00>] ceph_invalidatepage+0x70/0x190 [ceph] [<ffffffff8112656f>] ? delete_from_page_cache+0x5f/0x70 [<ffffffff81133cab>] truncate_inode_page+0x8b/0x90 [<ffffffff81133ded>] truncate_inode_pages_range.part.12+0x13d/0x620 [<ffffffff8113431d>] truncate_inode_pages_range+0x4d/0x60 [<ffffffff811343b5>] truncate_inode_pages+0x15/0x20 [<ffffffff8119bbf6>] evict+0x1a6/0x1b0 [<ffffffff8119c3f3>] iput+0x103/0x190 ... Signed-off-by: Milosz Tanski <milosz@adfin.com> Reviewed-by: Sage Weil <sage@inktank.com>
* | FS-Cache: Provide the ability to enable/disable cookiesDavid Howells2013-09-271-2/+2
|/ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Provide the ability to enable and disable fscache cookies. A disabled cookie will reject or ignore further requests to: Acquire a child cookie Invalidate and update backing objects Check the consistency of a backing object Allocate storage for backing page Read backing pages Write to backing pages but still allows: Checks/waits on the completion of already in-progress objects Uncaching of pages Relinquishment of cookies Two new operations are provided: (1) Disable a cookie: void fscache_disable_cookie(struct fscache_cookie *cookie, bool invalidate); If the cookie is not already disabled, this locks the cookie against other dis/enablement ops, marks the cookie as being disabled, discards or invalidates any backing objects and waits for cessation of activity on any associated object. This is a wrapper around a chunk split out of fscache_relinquish_cookie(), but it reinitialises the cookie such that it can be reenabled. All possible failures are handled internally. The caller should consider calling fscache_uncache_all_inode_pages() afterwards to make sure all page markings are cleared up. (2) Enable a cookie: void fscache_enable_cookie(struct fscache_cookie *cookie, bool (*can_enable)(void *data), void *data) If the cookie is not already enabled, this locks the cookie against other dis/enablement ops, invokes can_enable() and, if the cookie is not an index cookie, will begin the procedure of acquiring backing objects. The optional can_enable() function is passed the data argument and returns a ruling as to whether or not enablement should actually be permitted to begin. All possible failures are handled internally. The cookie will only be marked as enabled if provisional backing objects are allocated. A later patch will introduce these to NFS. Cookie enablement during nfs_open() is then contingent on i_writecount <= 0. can_enable() checks for a race between open(O_RDONLY) and open(O_WRONLY/O_RDWR). This simplifies NFS's cookie handling and allows us to get rid of open(O_RDONLY) accidentally introducing caching to an inode that's open for writing already. One operation has its API modified: (3) Acquire a cookie. struct fscache_cookie *fscache_acquire_cookie( struct fscache_cookie *parent, const struct fscache_cookie_def *def, void *netfs_data, bool enable); This now has an additional argument that indicates whether the requested cookie should be enabled by default. It doesn't need the can_enable() function because the caller must prevent multiple calls for the same netfs object and it doesn't need to take the enablement lock because no one else can get at the cookie before this returns. Signed-off-by: David Howells <dhowells@redhat.com
* ceph: use d_invalidate() to invalidate aliasesYan, Zheng2013-09-061-4/+4
| | | | | | | | d_invalidate() is the standard VFS method to invalidate dentry. compare to d_delete(), it also try shrinking children dentries. Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com> Reviewed-by: Sage Weil <sage@inktank.com>
* ceph: remove ceph_lookup_inode()Yan, Zheng2013-09-063-11/+1
| | | | | | | | | | | commit 6f60f889 (ceph: fix freeing inode vs removing session caps race) introduced ceph_lookup_inode(). But there is already a ceph_find_inode() which provides similar function. So remove ceph_lookup_inode(), use ceph_find_inode() instead. Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com> Reviewed-by: Alex Elder <alex.elder@linary.org> Reviewed-by: Sage Weil <sage@inktank.com>
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