diff options
Diffstat (limited to 'Documentation/filesystems')
| -rw-r--r-- | Documentation/filesystems/Locking | 2 | ||||
| -rw-r--r-- | Documentation/filesystems/cifs/README | 2 | ||||
| -rw-r--r-- | Documentation/filesystems/pohmelfs/design_notes.txt | 2 | ||||
| -rw-r--r-- | Documentation/filesystems/porting | 53 | ||||
| -rw-r--r-- | Documentation/filesystems/qnx6.txt | 2 | ||||
| -rw-r--r-- | Documentation/filesystems/vfs.txt | 2 |
6 files changed, 58 insertions, 5 deletions
diff --git a/Documentation/filesystems/Locking b/Documentation/filesystems/Locking index 619af9bfdcb3..75eea7ce3d7c 100644 --- a/Documentation/filesystems/Locking +++ b/Documentation/filesystems/Locking @@ -194,7 +194,7 @@ prototypes: void (*invalidatepage) (struct page *, unsigned int, unsigned int); int (*releasepage) (struct page *, int); void (*freepage)(struct page *); - int (*direct_IO)(struct kiocb *, struct iov_iter *iter, loff_t offset); + int (*direct_IO)(struct kiocb *, struct iov_iter *iter); int (*migratepage)(struct address_space *, struct page *, struct page *); int (*launder_page)(struct page *); int (*is_partially_uptodate)(struct page *, unsigned long, unsigned long); diff --git a/Documentation/filesystems/cifs/README b/Documentation/filesystems/cifs/README index 2d5622f60e11..a54788405429 100644 --- a/Documentation/filesystems/cifs/README +++ b/Documentation/filesystems/cifs/README @@ -272,7 +272,7 @@ A partial list of the supported mount options follows: same domain (e.g. running winbind or nss_ldap) and the server supports the Unix Extensions then the uid and gid can be retrieved from the server (and uid - and gid would not have to be specifed on the mount. + and gid would not have to be specified on the mount. For servers which do not support the CIFS Unix extensions, the default uid (and gid) returned on lookup of existing files will be the uid (gid) of the person diff --git a/Documentation/filesystems/pohmelfs/design_notes.txt b/Documentation/filesystems/pohmelfs/design_notes.txt index 8aef91335701..106d17fbb05f 100644 --- a/Documentation/filesystems/pohmelfs/design_notes.txt +++ b/Documentation/filesystems/pohmelfs/design_notes.txt @@ -29,7 +29,7 @@ Main features of this FS include: * Read request (data read, directory listing, lookup requests) balancing between multiple servers. * Write requests are replicated to multiple servers and completed only when all of them are acked. * Ability to add and/or remove servers from the working set at run-time. - * Strong authentification and possible data encryption in network channel. + * Strong authentication and possible data encryption in network channel. * Extended attributes support. POHMELFS is based on transactions, which are potentially long-standing objects that live diff --git a/Documentation/filesystems/porting b/Documentation/filesystems/porting index f1b87d8aa2da..46f3bb7a02f5 100644 --- a/Documentation/filesystems/porting +++ b/Documentation/filesystems/porting @@ -525,3 +525,56 @@ in your dentry operations instead. set_delayed_call() where it used to set *cookie. ->put_link() is gone - just give the destructor to set_delayed_call() in ->get_link(). +-- +[mandatory] + ->getxattr() and xattr_handler.get() get dentry and inode passed separately. + dentry might be yet to be attached to inode, so do _not_ use its ->d_inode + in the instances. Rationale: !@#!@# security_d_instantiate() needs to be + called before we attach dentry to inode. +-- +[mandatory] + symlinks are no longer the only inodes that do *not* have i_bdev/i_cdev/ + i_pipe/i_link union zeroed out at inode eviction. As the result, you can't + assume that non-NULL value in ->i_nlink at ->destroy_inode() implies that + it's a symlink. Checking ->i_mode is really needed now. In-tree we had + to fix shmem_destroy_callback() that used to take that kind of shortcut; + watch out, since that shortcut is no longer valid. +-- +[mandatory] + ->i_mutex is replaced with ->i_rwsem now. inode_lock() et.al. work as + they used to - they just take it exclusive. However, ->lookup() may be + called with parent locked shared. Its instances must not + * use d_instantiate) and d_rehash() separately - use d_add() or + d_splice_alias() instead. + * use d_rehash() alone - call d_add(new_dentry, NULL) instead. + * in the unlikely case when (read-only) access to filesystem + data structures needs exclusion for some reason, arrange it + yourself. None of the in-tree filesystems needed that. + * rely on ->d_parent and ->d_name not changing after dentry has + been fed to d_add() or d_splice_alias(). Again, none of the + in-tree instances relied upon that. + We are guaranteed that lookups of the same name in the same directory + will not happen in parallel ("same" in the sense of your ->d_compare()). + Lookups on different names in the same directory can and do happen in + parallel now. +-- +[recommended] + ->iterate_shared() is added; it's a parallel variant of ->iterate(). + Exclusion on struct file level is still provided (as well as that + between it and lseek on the same struct file), but if your directory + has been opened several times, you can get these called in parallel. + Exclusion between that method and all directory-modifying ones is + still provided, of course. + + Often enough ->iterate() can serve as ->iterate_shared() without any + changes - it is a read-only operation, after all. If you have any + per-inode or per-dentry in-core data structures modified by ->iterate(), + you might need something to serialize the access to them. If you + do dcache pre-seeding, you'll need to switch to d_alloc_parallel() for + that; look for in-tree examples. + + Old method is only used if the new one is absent; eventually it will + be removed. Switch while you still can; the old one won't stay. +-- +[mandatory] + ->atomic_open() calls without O_CREAT may happen in parallel. diff --git a/Documentation/filesystems/qnx6.txt b/Documentation/filesystems/qnx6.txt index 408679789136..4f3d6a882bdc 100644 --- a/Documentation/filesystems/qnx6.txt +++ b/Documentation/filesystems/qnx6.txt @@ -16,7 +16,7 @@ qnx6fs shares many properties with traditional Unix filesystems. It has the concepts of blocks, inodes and directories. On QNX it is possible to create little endian and big endian qnx6 filesystems. This feature makes it possible to create and use a different endianness fs -for the target (QNX is used on quite a range of embedded systems) plattform +for the target (QNX is used on quite a range of embedded systems) platform running on a different endianness. The Linux driver handles endianness transparently. (LE and BE) diff --git a/Documentation/filesystems/vfs.txt b/Documentation/filesystems/vfs.txt index 4164bd6397a2..c61a223ef3ff 100644 --- a/Documentation/filesystems/vfs.txt +++ b/Documentation/filesystems/vfs.txt @@ -591,7 +591,7 @@ struct address_space_operations { void (*invalidatepage) (struct page *, unsigned int, unsigned int); int (*releasepage) (struct page *, int); void (*freepage)(struct page *); - ssize_t (*direct_IO)(struct kiocb *, struct iov_iter *iter, loff_t offset); + ssize_t (*direct_IO)(struct kiocb *, struct iov_iter *iter); /* migrate the contents of a page to the specified target */ int (*migratepage) (struct page *, struct page *); int (*launder_page) (struct page *); |