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* nilfs2: get rid of nilfs_sb_info structureRyusuke Konishi2011-03-091-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This directly uses sb->s_fs_info to keep a nilfs filesystem object and fully removes the intermediate nilfs_sb_info structure. With this change, the hierarchy of on-memory structures of nilfs will be simplified as follows: Before: super_block -> nilfs_sb_info -> the_nilfs -> cptree --+-> nilfs_root (current file system) +-> nilfs_root (snapshot A) +-> nilfs_root (snapshot B) : -> nilfs_sc_info (log writer structure) After: super_block -> the_nilfs -> cptree --+-> nilfs_root (current file system) +-> nilfs_root (snapshot A) +-> nilfs_root (snapshot B) : -> nilfs_sc_info (log writer structure) The reason why we didn't design so from the beginning is because the initial shape also differed from the above. The early hierachy was composed of "per-mount-point" super_block -> nilfs_sb_info pairs and a shared nilfs object. On the kernel 2.6.37, it was changed to the current shape in order to unify super block instances into one per device, and this cleanup became applicable as the result. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
* nilfs2: i_nlink races in rename()Al Viro2011-03-031-7/+1
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* nilfs2: fiemap supportRyusuke Konishi2011-01-101-0/+1
| | | | | | | | | | | | | | This adds fiemap to nilfs. Two new functions, nilfs_fiemap and nilfs_find_uncommitted_extent are added. nilfs_fiemap() implements the fiemap inode operation, and nilfs_find_uncommitted_extent() helps to get a range of data blocks whose physical location has not been determined. nilfs_fiemap() collects extent information by looping through nilfs_bmap_lookup_contig and nilfs_find_uncommitted_extent routines. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
* new helper: ihold()Al Viro2010-10-251-1/+1
| | | | | | Clones an existing reference to inode; caller must already hold one. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* nilfs2: deny write access to inodes in snapshotsRyusuke Konishi2010-10-231-0/+1
| | | | | | | | | | | | | | | Snapshots of nilfs are read-only. After super block instances (sb) will be unified, nilfs will need to check write access by a way other than implicit test with IS_RDONLY(inode). This is because IS_RDONLY() refers to MS_RDONLY bit of inode->i_sb->s_flags and it will become inaccurate after the unification of sb. To prepare for the issue, this uses i_op->permission to deny write access to inodes in snapshots. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
* nilfs2: make snapshots in checkpoint tree exportableRyusuke Konishi2010-10-231-17/+120
| | | | | | | | | | | The previous export operations cannot handle multiple versions of a filesystem if they belong to the same sb instance. This adds a new type of file handle and extends export operations so that they can get the inode specified by a checkpoint number as well as an inode number and a generation number. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
* nilfs2: set pointer to root object in inodesRyusuke Konishi2010-10-231-2/+3
| | | | | | | | | | | | This puts a pointer to nilfs_root object in the private part of on-memory inode, and makes nilfs_iget function pick up the inode with the same root object. Non-root inodes inherit its nilfs_root object from parent inode. That of the root inode is allocated through nilfs_attach_checkpoint() function. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
* nilfs really shouldn't slap struct dentry on stack...Al Viro2010-03-031-8/+5
| | | | | | ... especially when it only needs (and initializes) .d_name of it Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* nilfs2: replace mark_inode_dirty as nilfs_mark_inode_dirtyJiro SEKIBA2009-11-271-16/+16
| | | | | | | | Replace mark_inode_dirty() as nilfs_mark_inode_dirty() to reduce deep function calls. Signed-off-by: Jiro SEKIBA <jir@unicus.jp> Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
* nilfs2: delete mark_inode_dirty in nilfs_delete_entryJiro SEKIBA2009-11-271-1/+2
| | | | | | | | Delete mark_inode_dirty() in nilfs_delete_entry() to reduce duplicate mark_inode_dirty() calls both in nilfs_rename() and nilfs_delete_entry(). Signed-off-by: Jiro SEKIBA <jir@unicus.jp> Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
* nilfs2: delete mark_inode_dirty in nilfs_commit_chunkJiro SEKIBA2009-11-271-1/+1
| | | | | | | | | Delete mark_inode_dirty() in nilfs_commit_chunk(), for callers of nilfs_commit_chunk() will call equivalent mark_inode_dirty() after calling nilfs_commit_chunk(). Signed-off-by: Jiro SEKIBA <jir@unicus.jp> Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
* nilfs2: split nilfs_unlink as nilfs_do_unlink and nilfs_unlinkJiro SEKIBA2009-11-271-10/+19
| | | | | | | | | | | | | | Split nilfs_unlink() to reduce nested transaction and duplicate mark_inode_dirty() calls when calling nilfs_unlink() from nilfs_rmdir(). nilfs_do_unlink() is an actual unlink functionality which is not in transaction and does not call mark_inode_dirty() for dentry argument. nilfs_unlink() is a wrapper function for do_nilfs_unlink() with transaction and mark_inode_dirty() for dentry argument. Signed-off-by: Jiro SEKIBA <jir@unicus.jp> Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
* nilfs2: delete redundant mark_inode_dirtyJiro SEKIBA2009-11-271-4/+0
| | | | | | | delete redundant mark_inode_dirty() calls Signed-off-by: Jiro SEKIBA <jir@unicus.jp> Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
* nilfs2: expand inode_inc_link_count and inode_dec_link_countJiro SEKIBA2009-11-271-17/+32
| | | | | | | | This is an intermidiate patch to reduce redandunt mark_inode_dirty() calls by calling inode_inc_link_count() and inode_dec_link_count() functions. Signed-off-by: Jiro SEKIBA <jir@unicus.jp> Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
* nilfs2: delete mark_inode_dirty from nilfs_set_linkJiro SEKIBA2009-11-271-1/+3
| | | | | | | | Delete mark_inode_dirty() from nilfs_set_link() to reduce redundant mark_inode_dirty() calls in caller of nilfs_set_link(). Signed-off-by: Jiro SEKIBA <jir@unicus.jp> Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
* nilfs2: delete mark_inode_dirty in nilfs_new_inodeJiro SEKIBA2009-11-271-1/+1
| | | | | | | | | It is redundant to call mark_inode_dirty() in nilfs_new_inode() because all caller of nilfs_new_inode() will call mark_inode_dirty() after calling nilfs_new_inode() directly or indirectly in transaction. Signed-off-by: Jiro SEKIBA <jir@unicus.jp> Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
* const: mark remaining inode_operations as constAlexey Dobriyan2009-09-221-3/+3
| | | | | | Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* nilfs2: avoid double error caused by nilfs_transaction_endRyusuke Konishi2009-04-071-23/+51
| | | | | | | | | | | | | | | | | | | | | | | | | Pekka Enberg pointed out that double error handlings found after nilfs_transaction_end() can be avoided by separating abort operation: OK, I don't understand this. The only way nilfs_transaction_end() can fail is if we have NILFS_TI_SYNC set and we fail to construct the segment. But why do we want to construct a segment if we don't commit? I guess what I'm asking is why don't we have a separate nilfs_transaction_abort() function that can't fail for the erroneous case to avoid this double error value tracking thing? This does the separation and renames nilfs_transaction_end() to nilfs_transaction_commit() for clarification. Since, some calls of these functions were used just for exclusion control against the segment constructor, they are replaced with semaphore operations. Acked-by: Pekka Enberg <penberg@cs.helsinki.fi> Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* nilfs2: pathname operationsRyusuke Konishi2009-04-071-0/+446
This adds pathname operations, most of which comes from the ext2 file system. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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