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2010-10-24Merge branch 'for-next' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial * 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial: (39 commits) Update broken web addresses in arch directory. Update broken web addresses in the kernel. Revert "drivers/usb: Remove unnecessary return's from void functions" for musb gadget Revert "Fix typo: configuation => configuration" partially ida: document IDA_BITMAP_LONGS calculation ext2: fix a typo on comment in ext2/inode.c drivers/scsi: Remove unnecessary casts of private_data drivers/s390: Remove unnecessary casts of private_data net/sunrpc/rpc_pipe.c: Remove unnecessary casts of private_data drivers/infiniband: Remove unnecessary casts of private_data drivers/gpu/drm: Remove unnecessary casts of private_data kernel/pm_qos_params.c: Remove unnecessary casts of private_data fs/ecryptfs: Remove unnecessary casts of private_data fs/seq_file.c: Remove unnecessary casts of private_data arm: uengine.c: remove C99 comments arm: scoop.c: remove C99 comments Fix typo configue => configure in comments Fix typo: configuation => configuration Fix typo interrest[ing|ed] => interest[ing|ed] Fix various typos of valid in comments ... Fix up trivial conflicts in: drivers/char/ipmi/ipmi_si_intf.c drivers/usb/gadget/rndis.c net/irda/irnet/irnet_ppp.c
2010-10-24Revert "block: fix accounting bug on cross partition merges"Jens Axboe
This reverts commit 7681bfeeccff5efa9eb29bf09249a3c400b15327. Conflicts: include/linux/genhd.h It has numerous issues with the cleanup path and non-elevator devices. Revert it for now so we can come up with a clean version without rushing things. Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
2010-10-24NFSv4: Fix up the 'dircount' hint in encode_readdirTrond Myklebust
Also ensure we only ask for either fileid or mounted_on_fileid in the readdirplus case too... Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2010-10-24NFSv4: Clean up nfs4_decode_direntTrond Myklebust
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2010-10-24NFSv4: nfs4_decode_dirent must clear entry->fattr->validTrond Myklebust
Otherwise, we may end up reading uninitialised data from the resulting struct nfs_fattr. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2010-10-23NFSv4: Fix a regression in decode_getfattrTrond Myklebust
We don't want to have the mounted_on_fileid overwrite the true fileid. We only return the former if the server didn't supply the true fileid. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2010-10-23NFSv4: Fix up decode_attr_filehandle() to handle the case of empty fh pointerTrond Myklebust
decode_attr_filehandle still needs to skip the XDR-encoded filehandle if someone passes a null pointer argument. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2010-10-23NFS: Ensure we check all allocation return values in new readdir codeTrond Myklebust
Also some clean ups. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2010-10-23NFS: Readdir plus in v4Bryan Schumaker
By requsting more attributes during a readdir, we can mimic the readdir plus operation that was in NFSv3. To test, I ran the command `ls -lU --color=none` on directories with various numbers of files. Without readdir plus, I see this: n files | 100 | 1,000 | 10,000 | 100,000 | 1,000,000 --------+-----------+-----------+-----------+-----------+---------- real | 0m00.153s | 0m00.589s | 0m05.601s | 0m56.691s | 9m59.128s user | 0m00.007s | 0m00.007s | 0m00.077s | 0m00.703s | 0m06.800s sys | 0m00.010s | 0m00.070s | 0m00.633s | 0m06.423s | 1m10.005s access | 3 | 1 | 1 | 4 | 31 getattr | 2 | 1 | 1 | 1 | 1 lookup | 104 | 1,003 | 10,003 | 100,003 | 1,000,003 readdir | 2 | 16 | 158 | 1,575 | 15,749 total | 111 | 1,021 | 10,163 | 101,583 | 1,015,784 With readdir plus enabled, I see this: n files | 100 | 1,000 | 10,000 | 100,000 | 1,000,000 --------+-----------+-----------+-----------+-----------+---------- real | 0m00.115s | 0m00.206s | 0m01.079s | 0m12.521s | 2m07.528s user | 0m00.003s | 0m00.003s | 0m00.040s | 0m00.290s | 0m03.296s sys | 0m00.007s | 0m00.020s | 0m00.120s | 0m01.357s | 0m17.556s access | 3 | 1 | 1 | 1 | 7 getattr | 2 | 1 | 1 | 1 | 1 lookup | 4 | 3 | 3 | 3 | 3 readdir | 6 | 62 | 630 | 6,300 | 62,993 total | 15 | 67 | 635 | 6,305 | 63,004 Readdir plus disabled has about a 16x increase in the number of rpc calls and is 4 - 5 times slower on large directories. Signed-off-by: Bryan Schumaker <bjschuma@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2010-10-23NFS: introduce generic decode_getattr functionBryan Schumaker
Getattr should be able to decode errors and the readdir file handle. decode_getfattr_attrs does the actual attribute decoding, while decode_getfattr_generic will check the opcode before decoding. This will let other functions call decode_getfattr_attrs to decode their attributes. Signed-off-by: Bryan Schumaker <bjschuma@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2010-10-23NFS: check xdr_decode for errorsBryan Schumaker
Check if the decoded entry has the eof bit set when returning from xdr_decode with an error. If it does, we should set the eof bits in the array before returning. This should keep us from looping when we expect more data but the server doesn't give us anything new. Signed-off-by: Bryan Schumaker <bjschuma@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2010-10-23NFS: nfs_readdir_filler catch all errorsBryan Schumaker
Check for all errors, not a specific one. Signed-off-by: Bryan Schumaker <bjschuma@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2010-10-23NFS: readdir with vmapped pagesBryan Schumaker
We can use vmapped pages to read more information from the network at once. This will reduce the number of calls needed to complete a readdir. Signed-off-by: Bryan Schumaker <bjschuma@netapp.com> [trondmy: Added #include for linux/vmalloc.h> in fs/nfs/dir.c] Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2010-10-23NFS: remove page size checking codeBryan Schumaker
Remove the page size checking code for a readdir decode. This is now done by decode_dirent with xdr_streams. Signed-off-by: Bryan Schumaker <bjschuma@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2010-10-23NFS: decode_dirent should use an xdr_streamBryan Schumaker
Convert nfs*xdr.c to use an xdr stream in decode_dirent. This will prevent a kernel oops that has been occuring when reading a vmapped page. Signed-off-by: Bryan Schumaker <bjschuma@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2010-10-23NFS: remove readdir plus limitBryan Schumaker
We will now use readdir plus even on directories that are very large. Signed-off-by: Bryan Schumaker <bjschuma@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2010-10-23NFS: re-add readdir plusBryan Schumaker
This patch adds readdir plus support to the cache array. Signed-off-by: Bryan Schumaker <bjschuma@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2010-10-23NFS: Optimise the readdir searchesTrond Myklebust
If we're going through the loop in nfs_readdir() more than once, we usually do not want to restart searching from the beginning of the pages cache. We only want to do that if the previous search failed... Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2010-10-23NFS: add readdir cache arrayBryan Schumaker
This patch adds the readdir cache array and functions to retreive the array stored on a cache page, clear the array by freeing allocated memory, add an entry to the array, and search the array for a given cookie. It then modifies readdir to make use of the new cache array. With the new cache array method, we no longer need some of this code. Finally, nfs_llseek_dir() will set file->f_pos to a value greater than 0 and desc->dir_cookie to zero. When we see this, readdir needs to find the file at position file->f_pos from the start of the directory. Signed-off-by: Bryan Schumaker <bjschuma@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2010-10-23nfs: include ratelimit.h, fix nfs4state build errorRandy Dunlap
nfs4state.c uses interfaces from ratelimit.h. It needs to include that header file to fix build errors: fs/nfs/nfs4state.c:1195: warning: type defaults to 'int' in declaration of 'DEFINE_RATELIMIT_STATE' fs/nfs/nfs4state.c:1195: warning: parameter names (without types) in function declaration fs/nfs/nfs4state.c:1195: error: invalid storage class for function 'DEFINE_RATELIMIT_STATE' fs/nfs/nfs4state.c:1195: error: implicit declaration of function '__ratelimit' fs/nfs/nfs4state.c:1195: error: '_rs' undeclared (first use in this function) Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com> Cc: Trond Myklebust <Trond.Myklebust@netapp.com> Cc: linux-nfs@vger.kernel.org Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2010-10-23NFSv4: The state manager must ignore EKEYEXPIRED.Trond Myklebust
Otherwise, we cannot recover state correctly. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2010-10-23NFSv4: Don't ignore the error return codes from nfs_intent_set_fileTrond Myklebust
If nfs_intent_set_file() returns an error, we usually want to pass that back up the stack. Also ensure that nfs_open_revalidate() returns '1' on success. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2010-10-23Revert "tty: Add a new file /proc/tty/consoles"Linus Torvalds
This reverts commit f4a3e0bceb57466c31757f25e4e0ed108d1299ec. Jiri Sladby points out that the tty structure we're using may already be gone, and Al Viro doesn't hold back in complaining about the random loading of 'filp->private_data' which doesn't have to be a pointer at all, nor does checking the magic field for TTY_MAGIC prove anything. Belated review by Al: "a) global variable depending on stdin of the last opener? Affecting output of read(2)? Really? b) iterator is broken; list should be locked in ->start(), unlocked in ->stop() and *NOT* unlocked/relocked in ->next() c) ->show() ought to do nothing in case of ->device == NULL, instead of skipping those in ->next()/->start() d) regardless of the merits of the bright idea about asterisk at that line in output *and* regardless of (a), the implementation is not only atrociously ugly, it's actually very likely to be a roothole. Verifying that Cthulhu knows what number happens to be address of a tty_struct by blindly dereferencing memory at that address... Ouch. Please revert that crap." And Christoph pipes in and NAK's the approach of walking fd tables etc too. So it's pretty unanimous. Noticed-by: Jri Slaby <jslaby@suse.cz> Requested-by: Al Viro <viro@zeniv.linux.org.uk> Cc: Greg Kroah-Hartman <gregkh@suse.de> Cc: Werner Fink <werner@suse.de> Cc: Alan Cox <alan@lxorguk.ukuu.org.uk> Cc: Christoph Hellwig <hch@infradead.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-10-23Merge branch 'for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/ryusuke/nilfs2 * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ryusuke/nilfs2: (36 commits) nilfs2: eliminate sparse warning - "context imbalance" nilfs2: eliminate sparse warnings - "symbol not declared" nilfs2: get rid of bdi from nilfs object nilfs2: change license of exported header file nilfs2: add bdev freeze/thaw support nilfs2: accept 64-bit checkpoint numbers in cp mount option nilfs2: remove own inode allocator and destructor for metadata files nilfs2: get rid of back pointer to writable sb instance nilfs2: get rid of mi_nilfs back pointer to nilfs object nilfs2: see state of root dentry for mount check of snapshots nilfs2: use iget for all metadata files nilfs2: get rid of GCDAT inode nilfs2: add routines to redirect access to buffers of DAT file nilfs2: add routines to roll back state of DAT file nilfs2: add routines to save and restore bmap state nilfs2: do not allocate nilfs_mdt_info structure to gc-inodes nilfs2: allow nilfs_clear_inode to clear metadata file inodes nilfs2: get rid of snapshot mount flag nilfs2: simplify life cycle management of nilfs object nilfs2: do not allocate multiple super block instances for a device ...
2010-10-22Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty-2.6Linus Torvalds
* git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty-2.6: (49 commits) serial8250: ratelimit "too much work" error serial: bfin_sport_uart: speed up sport RX sample rate to be 3% faster serial: abstraction for 8250 legacy ports serial/imx: check that the buffer is non-empty before sending it out serial: mfd: add more baud rates support jsm: Remove the uart port on errors Alchemy: Add UART PM methods. 8250: allow platforms to override PM hook. altera_uart: Don't use plain integer as NULL pointer altera_uart: Fix missing prototype for registering an early console altera_uart: Fixup type usage of port flags altera_uart: Make it possible to use Altera UART and 8250 ports together altera_uart: Add support for different address strides altera_uart: Add support for getting mapbase and IRQ from resources altera_uart: Add support for polling mode (IRQ-less) serial: Factor out uart_poll_timeout() from 8250 driver serial: mark the 8250 driver as maintained serial: 8250: Don't delay after transmitter is ready. tty: MAINTAINERS: add drivers/serial/jsm/ as maintained driver vcs: invoke the vt update callback when /dev/vcs* is written to ...
2010-10-22Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core-2.6Linus Torvalds
* git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core-2.6: (31 commits) driver core: Display error codes when class suspend fails Driver core: Add section count to memory_block struct Driver core: Add mutex for adding/removing memory blocks Driver core: Move find_memory_block routine hpilo: Despecificate driver from iLO generation driver core: Convert link_mem_sections to use find_memory_block_hinted. driver core: Introduce find_memory_block_hinted which utilizes kset_find_obj_hinted. kobject: Introduce kset_find_obj_hinted. driver core: fix build for CONFIG_BLOCK not enabled driver-core: base: change to new flag variable sysfs: only access bin file vm_ops with the active lock sysfs: Fail bin file mmap if vma close is implemented. FW_LOADER: fix kconfig dependency warning on HOTPLUG uio: Statically allocate uio_class and use class .dev_attrs. uio: Support 2^MINOR_BITS minors uio: Cleanup irq handling. uio: Don't clear driver data uio: Fix lack of locking in init_uio_class SYSFS: Allow boot time switching between deprecated and modern sysfs layout driver core: remove CONFIG_SYSFS_DEPRECATED_V2 but keep it for block devices ...
2010-10-22ocfs2: drop the BLKDEV_IFL_WAIT flagLinus Torvalds
Commit dd3932eddf42 ("block: remove BLKDEV_IFL_WAIT") had removed the flag argument to blkdev_issue_flush(), but the ocfs2 merge brought in a new one. It didn't cause a merge conflict, so the merges silently worked out fine, but the result didn't actually compile. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-10-22Merge git://git.kernel.org/pub/scm/linux/kernel/git/sfrench/cifs-2.6Linus Torvalds
* git://git.kernel.org/pub/scm/linux/kernel/git/sfrench/cifs-2.6: (56 commits) [CIFS] move close processing from cifs_close to cifsFileInfo_put cifs: convert cifs_tcp_ses_lock from a rwlock to a spinlock cifs: cancel_delayed_work() + flush_scheduled_work() -> cancel_delayed_work_sync() Clean up two declarations of blob_len cifs: move cifsFileInfo_put to file.c cifs: convert GlobalSMBSeslock from a rwlock to regular spinlock [CIFS] Fix minor checkpatch warning and update cifs version cifs: move cifs_new_fileinfo to file.c cifs: eliminate pfile pointer from cifsFileInfo cifs: cifs_write argument change and cleanup cifs: clean up cifs_reopen_file cifs: eliminate the inode argument from cifs_new_fileinfo cifs: eliminate oflags option from cifs_new_fileinfo cifs: fix flags handling in cifs_posix_open cifs: eliminate cifs_posix_open_inode_helper cifs: handle FindFirst failure gracefully NTLM authentication and signing - Calculate auth response per smb session cifs: don't use vfsmount to pin superblock for oplock breaks cifs: keep dentry reference in cifsFileInfo instead of inode reference cifs: on multiuser mount, set ownership to current_fsuid/current_fsgid (try #7) ... Fix up trivial conflict in fs/cifs/cifsfs.c due to added/removed header files
2010-10-22Merge branch 'for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/teigland/dlm * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/teigland/dlm: dlm: Fix dlm lock status block comment in dlm.h dlm: Don't send callback to node making lock request when "try 1cb" fails
2010-10-22Merge branch 'for-linus' of git://oss.sgi.com/xfs/xfsLinus Torvalds
* 'for-linus' of git://oss.sgi.com/xfs/xfs: (36 commits) xfs: semaphore cleanup xfs: Extend project quotas to support 32bit project ids xfs: remove xfs_buf wrappers xfs: remove xfs_cred.h xfs: remove xfs_globals.h xfs: remove xfs_version.h xfs: remove xfs_refcache.h xfs: fix the xfs_trans_committed xfs: remove unused t_callback field in struct xfs_trans xfs: fix bogus m_maxagi check in xfs_iget xfs: do not use xfs_mod_incore_sb_batch for per-cpu counters xfs: do not use xfs_mod_incore_sb for per-cpu counters xfs: remove XFS_MOUNT_NO_PERCPU_SB xfs: pack xfs_buf structure more tightly xfs: convert buffer cache hash to rbtree xfs: serialise inode reclaim within an AG xfs: batch inode reclaim lookup xfs: implement batched inode lookups for AG walking xfs: split out inode walk inode grabbing xfs: split inode AG walking into separate code for reclaim ...
2010-10-23nilfs2: eliminate sparse warning - "context imbalance"Jiro SEKIBA
insert sparse annotations to fix following sparse warning. fs/nilfs2/segment.c:2681:3: warning: context imbalance in 'nilfs_segctor_kill_thread' - unexpected unlock nilfs_segctor_kill_thread is only called inside sc_state_lock lock. sparse doesn't detect the context and warn "unexpected unlock". __acquires/__releases pretend to lock/unlock the sc_state_lock for sparse. Signed-off-by: Jiro SEKIBA <jir@unicus.jp> Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
2010-10-23nilfs2: eliminate sparse warnings - "symbol not declared"Jiro SEKIBA
change nilfs_dat_commit_free and nilfs_inode_cachep static to fix following warnings fs/nilfs2/super.c:72:19: warning: symbol 'nilfs_inode_cachep' was not declared. Should it be static? fs/nilfs2/dat.c:106:6: warning: symbol 'nilfs_dat_commit_free' was not declared. Should it be static? Signed-off-by: Jiro SEKIBA <jir@unicus.jp> Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
2010-10-23nilfs2: get rid of bdi from nilfs objectRyusuke Konishi
Nilfs now can use sb->s_bdi to get backing_dev_info, so we use it instead of ns_bdi on the nilfs object and remove ns_bdi. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
2010-10-23nilfs2: add bdev freeze/thaw supportRyusuke Konishi
Nilfs hasn't supported the freeze/thaw feature because it didn't work due to the peculiar design that multiple super block instances could be allocated for a device. This limitation was removed by the patch "nilfs2: do not allocate multiple super block instances for a device". So now this adds the freeze/thaw support to nilfs. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
2010-10-23nilfs2: accept 64-bit checkpoint numbers in cp mount optionRyusuke Konishi
The current implementation doesn't mount snapshots with checkpoint numbers larger than INT_MAX since it uses match_int() for parsing "cp=" mount option. This uses simple_strtoull() for the conversion to resolve the issue. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
2010-10-23nilfs2: remove own inode allocator and destructor for metadata filesRyusuke Konishi
This finally removes own inode allocator and destructor functions for metadata files. Several routines, nilfs_mdt_new(), nilfs_mdt_new_common(), nilfs_mdt_clear(), nilfs_mdt_destroy(), and nilfs_alloc_inode_common() will be gone. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
2010-10-23nilfs2: get rid of back pointer to writable sb instanceRyusuke Konishi
Nilfs object holds a back pointer to a writable super block instance in nilfs->ns_writer, and this became eliminable since sb is now made per device and all inodes have a valid pointer to it. This deletes the ns_writer pointer and a reader/writer semaphore protecting it. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
2010-10-23nilfs2: get rid of mi_nilfs back pointer to nilfs objectRyusuke Konishi
This removes a back pointer to nilfs object from nilfs_mdt_info structure that is attached to metadata files. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
2010-10-23nilfs2: see state of root dentry for mount check of snapshotsRyusuke Konishi
After applied the patch that unified sb instances, root dentry of snapshots can be left in dcache even after their trees are unmounted. The orphan root dentry/inode keeps a root object, and this causes false positive of nilfs_checkpoint_is_mounted function. This resolves the issue by having nilfs_checkpoint_is_mounted test whether the root dentry is busy or not. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
2010-10-23nilfs2: use iget for all metadata filesRyusuke Konishi
This makes use of iget5_locked to allocate or get inode for metadata files to stop using own inode allocator. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
2010-10-23nilfs2: get rid of GCDAT inodeRyusuke Konishi
This applies prepared rollback function and redirect function of metadata file to DAT file, and eliminates GCDAT inode. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
2010-10-23nilfs2: add routines to redirect access to buffers of DAT fileRyusuke Konishi
During garbage collection (GC), DAT file, which converts virtual block number to real block number, may return disk block number that is not yet written to the device. To avoid access to unwritten blocks, the current implementation stores changes to the caches of GCDAT during GC and atomically commit the changes into the DAT file after they are written to the device. This patch, instead, adds a function that makes a copy of specified buffer and stores it in nilfs_shadow_map, and a function to get the backup copy as needed (nilfs_mdt_freeze_buffer and nilfs_mdt_get_frozen_buffer respectively). Before DAT changes block number in an entry block, it makes a copy and redirect access to the buffer so that address conversion function (i.e. nilfs_dat_translate) refers to the old address saved in the copy. This patch gives requisites for such redirection. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
2010-10-23nilfs2: add routines to roll back state of DAT fileRyusuke Konishi
This adds optional function to metadata files which makes a copy of bmap, page caches, and b-tree node cache, and rolls back to the copy as needed. This enhancement is intended to displace gcdat inode that provides a similar function in a different way. In this patch, nilfs_shadow_map structure is added to store a copy of the foregoing states. nilfs_mdt_setup_shadow_map relates this structure to a metadata file. And, nilfs_mdt_save_to_shadow_map() and nilfs_mdt_restore_from_shadow_map() provides save and restore functions respectively. Finally, nilfs_mdt_clear_shadow_map() clears states of nilfs_shadow_map. The copy of b-tree node cache and page cache is made by duplicating only dirty pages into corresponding caches in nilfs_shadow_map. Their restoration is done by clearing dirty pages from original caches and by copying dirty pages back from nilfs_shadow_map. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
2010-10-23nilfs2: add routines to save and restore bmap stateRyusuke Konishi
This adds routines to save and restore the state of bmap structure. The bmap state is stored in a given nilfs_bmap_store object. These routines will be used to roll back the state of dat inode without using gcdat inode. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
2010-10-23nilfs2: do not allocate nilfs_mdt_info structure to gc-inodesRyusuke Konishi
GC-inode now doesn't need the nilfs_mdt_info structure and there is no reason that it is a sort of metadata files. This stops the allocation and makes them not dependent on metadata file routines. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
2010-10-23nilfs2: allow nilfs_clear_inode to clear metadata file inodesRyusuke Konishi
Allows clear inode function (nilfs_clear_inode) to handle metadata files that uses bitmap-based object alloctor. DAT and ifile correspond to this. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
2010-10-23nilfs2: simplify life cycle management of nilfs objectRyusuke Konishi
This stops pre-allocating nilfs object in nilfs_get_sb routine, and stops managing its life cycle by reference counting. nilfs_find_or_create_nilfs() function, nilfs->ns_mount_mutex, nilfs_objects list, and the reference counter will be removed through the simplification. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
2010-10-23nilfs2: do not allocate multiple super block instances for a deviceRyusuke Konishi
This stops allocating multiple super block instances for a device. All snapshots and a current mode mount (i.e. latest tree) will be controlled with nilfs_root objects that are kept within an sb instance. nilfs_get_sb() is rewritten so that it always has a root object for the latest tree and snapshots make additional root objects. The root dentry of the latest tree is binded to sb->s_root even if it isn't attached on a directory. Root dentries of snapshots or the latest tree are binded to mnt->mnt_root on which they are mounted. With this patch, nilfs_find_sbinfo() function, nilfs->ns_supers list, and nilfs->ns_current back pointer, are deleted. In addition, init_nilfs() and load_nilfs() are simplified since they will be called once for a device, not repeatedly called for mount points. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
2010-10-23nilfs2: split out nilfs_attach_snapshotRyusuke Konishi
This splits the code to attach snapshots into a separate routine for convenience sake. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
2010-10-23nilfs2: split out nilfs_get_root_dentryRyusuke Konishi
This splits the code to allocate root dentry into a separate routine for convenience in successive changes. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>