Eric Lee / smarc-fsl-linux-kernel

17 Oct, 2007

2 commits

  • 55144768e   fs: remove some AOP_TRUNCATED_PAGE ... Browse Code »

    prepare/commit_write no longer returns AOP_TRUNCATED_PAGE since OCFS2 and
    GFS2 were converted to the new aops, so we can make some simplifications
    for that.

    [michal.k.k.piotrowski@gmail.com: fix warning]
    Signed-off-by: Nick Piggin
    Cc: Michael Halcrow
    Cc: Mark Fasheh
    Cc: Steven Whitehouse
    Signed-off-by: Michal Piotrowski
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Nick Piggin
     
  • afddba49d   fs: introduce write_begin, write_end, and perform_write aops ... Browse Code »

    These are intended to replace prepare_write and commit_write with more
    flexible alternatives that are also able to avoid the buffered write
    deadlock problems efficiently (which prepare_write is unable to do).

    [mark.fasheh@oracle.com: API design contributions, code review and fixes]
    [akpm@linux-foundation.org: various fixes]
    [dmonakhov@sw.ru: new aop block_write_begin fix]
    Signed-off-by: Nick Piggin
    Signed-off-by: Mark Fasheh
    Signed-off-by: Dmitriy Monakhov
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Nick Piggin
     

17 Jul, 2007

2 commits

09 May, 2007

1 commit

  • c23fbb6bc   VFS: delay the dentry name generation on sockets and pipes ... Browse Code »

    1) Introduces a new method in 'struct dentry_operations'. This method
    called d_dname() might be called from d_path() to build a pathname for
    special filesystems. It is called without locks.

    Future patches (if we succeed in having one common dentry for all
    pipes/sockets) may need to change prototype of this method, but we now
    use : char *d_dname(struct dentry *dentry, char *buffer, int buflen);

    2) Adds a dynamic_dname() helper function that eases d_dname() implementations

    3) Defines d_dname method for sockets : No more sprintf() at socket
    creation. This is delayed up to the moment someone does an access to
    /proc/pid/fd/...

    4) Defines d_dname method for pipes : No more sprintf() at pipe
    creation. This is delayed up to the moment someone does an access to
    /proc/pid/fd/...

    A benchmark consisting of 1.000.000 calls to pipe()/close()/close() gives a
    *nice* speedup on my Pentium(M) 1.6 Ghz :

    3.090 s instead of 3.450 s

    Signed-off-by: Eric Dumazet
    Acked-by: Christoph Hellwig
    Acked-by: Linus Torvalds
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Eric Dumazet
     

21 Feb, 2007

1 commit

  • 955eff5ac   [PATCH] fs: fix libfs data leak ... Browse Code »

    simple_prepare_write leaks uninitialised kernel data. This happens because
    the it leaves an uninitialised "hole" over the part of the page that the
    write is expected to go to. This is fine, but it then marks the page
    uptodate, which means a concurrent read can come in and copy the
    uninitialised memory into userspace before it written to.

    Fix it by simply marking it uptodate in simple_commit_write instead, after
    the hole has been filled in. This could theoretically break an fs that
    uses simple_prepare_write and not simple_commit_write, and that relies on
    the incorrect simple_prepare_write behaviour. Luckily, none of those
    exists in the tree.

    Signed-off-by: Nick Piggin
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Nick Piggin
     

04 Oct, 2006

1 commit

01 Oct, 2006

1 commit

  • 027445c37   [PATCH] Vectorize aio_read/aio_write fileop methods ... Browse Code »

    This patch vectorizes aio_read() and aio_write() methods to prepare for
    collapsing all aio & vectored operations into one interface - which is
    aio_read()/aio_write().

    Signed-off-by: Badari Pulavarty
    Signed-off-by: Christoph Hellwig
    Cc: Michael Holzheu
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Badari Pulavarty
     

11 Jul, 2006

1 commit

  • 5d8b2ebfa   [PATCH] VFS documentation tweak ... Browse Code »

    As I was looking over the get_sb() changes, I stumbled across a little
    mistake in the documentation updates. Unless we're getting into an
    interesting new object-oriented realm, I doubt that get_sb() should really
    return "struct int"...

    Signed-off-by: Jonathan Corbet
    Acked-by: David Howells
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Jonathan Corbet
     

23 Jun, 2006

2 commits

  • 726c33422   [PATCH] VFS: Permit filesystem to perform statfs with a known root dentry ... Browse Code »

    Give the statfs superblock operation a dentry pointer rather than a superblock
    pointer.

    This complements the get_sb() patch. That reduced the significance of
    sb->s_root, allowing NFS to place a fake root there. However, NFS does
    require a dentry to use as a target for the statfs operation. This permits
    the root in the vfsmount to be used instead.

    linux/mount.h has been added where necessary to make allyesconfig build
    successfully.

    Interest has also been expressed for use with the FUSE and XFS filesystems.

    Signed-off-by: David Howells
    Acked-by: Al Viro
    Cc: Nathan Scott
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    David Howells
     
  • 454e2398b   [PATCH] VFS: Permit filesystem to override root dentry on mount ... Browse Code »

    Extend the get_sb() filesystem operation to take an extra argument that
    permits the VFS to pass in the target vfsmount that defines the mountpoint.

    The filesystem is then required to manually set the superblock and root dentry
    pointers. For most filesystems, this should be done with simple_set_mnt()
    which will set the superblock pointer and then set the root dentry to the
    superblock's s_root (as per the old default behaviour).

    The get_sb() op now returns an integer as there's now no need to return the
    superblock pointer.

    This patch permits a superblock to be implicitly shared amongst several mount
    points, such as can be done with NFS to avoid potential inode aliasing. In
    such a case, simple_set_mnt() would not be called, and instead the mnt_root
    and mnt_sb would be set directly.

    The patch also makes the following changes:

    (*) the get_sb_*() convenience functions in the core kernel now take a vfsmount
    pointer argument and return an integer, so most filesystems have to change
    very little.

    (*) If one of the convenience function is not used, then get_sb() should
    normally call simple_set_mnt() to instantiate the vfsmount. This will
    always return 0, and so can be tail-called from get_sb().

    (*) generic_shutdown_super() now calls shrink_dcache_sb() to clean up the
    dcache upon superblock destruction rather than shrink_dcache_anon().

    This is required because the superblock may now have multiple trees that
    aren't actually bound to s_root, but that still need to be cleaned up. The
    currently called functions assume that the whole tree is rooted at s_root,
    and that anonymous dentries are not the roots of trees which results in
    dentries being left unculled.

    However, with the way NFS superblock sharing are currently set to be
    implemented, these assumptions are violated: the root of the filesystem is
    simply a dummy dentry and inode (the real inode for '/' may well be
    inaccessible), and all the vfsmounts are rooted on anonymous[*] dentries
    with child trees.

    [*] Anonymous until discovered from another tree.

    (*) The documentation has been adjusted, including the additional bit of
    changing ext2_* into foo_* in the documentation.

    [akpm@osdl.org: convert ipath_fs, do other stuff]
    Signed-off-by: David Howells
    Acked-by: Al Viro
    Cc: Nathan Scott
    Cc: Roland Dreier
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    David Howells
     

11 Apr, 2006

1 commit

26 Mar, 2006

2 commits

03 Jan, 2006

1 commit

07 Nov, 2005

2 commits

  • cbf8f0f36   [PATCH] VFS: split dentry locking documentation ... Browse Code »

    This patch splits dentry locking documentation from
    Documentation/filesystems/vfs.txt to a separate file. The dentry locking
    bits are useful but do not fit into the VFS overview document as is.

    Signed-off-by: Pekka Enberg
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Pekka Enberg
     
  • cc7d1f8f9   [PATCH] VFS: update overview document ... Browse Code »

    This patch updates the Documentation/filesystems/vfs.txt document. I
    rearranged and rewrote parts of the introduction chapter and added better
    headings for each section. I also added a description for the inode
    rename() operation which was missing and added links to some useful
    external VFS documentation.

    Signed-off-by: Pekka Enberg
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Pekka Enberg
     

10 Sep, 2005

1 commit

  • 5ea626aac   [PATCH] VFS: update documentation ... Browse Code »

    This patch brings the now out-of-date Documentation/filesystems/vfs.txt
    back to life. Thanks to Carsten Otte, Trond Myklebust, and Anton
    Altaparmakov for their help on updating this documentation.

    Signed-off-by: Pekka Enberg
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Pekka J Enberg
     

17 Apr, 2005

1 commit

  • 1da177e4c   Linux-2.6.12-rc2 ... Browse Code »

    Initial git repository build. I'm not bothering with the full history,
    even though we have it. We can create a separate "historical" git
    archive of that later if we want to, and in the meantime it's about
    3.2GB when imported into git - space that would just make the early
    git days unnecessarily complicated, when we don't have a lot of good
    infrastructure for it.

    Let it rip!

    Linus Torvalds