Eric Lee / smarc-fsl-linux-kernel

23 Jun, 2006

1 commit

  • 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
     

15 Apr, 2006

1 commit

  • 4508a7a73   [PATCH] sysfs: Allow sysfs attribute files to be pollable ... Browse Code »

    It works like this:
    Open the file
    Read all the contents.
    Call poll requesting POLLERR or POLLPRI (so select/exceptfds works)
    When poll returns,
    close the file and go to top of loop.
    or lseek to start of file and go back to the 'read'.

    Events are signaled by an object manager calling
    sysfs_notify(kobj, dir, attr);

    If the dir is non-NULL, it is used to find a subdirectory which
    contains the attribute (presumably created by sysfs_create_group).

    This has a cost of one int per attribute, one wait_queuehead per kobject,
    one int per open file.

    The name "sysfs_notify" may be confused with the inotify
    functionality. Maybe it would be nice to support inotify for sysfs
    attributes as well?

    This patch also uses sysfs_notify to allow /sys/block/md*/md/sync_action
    to be pollable

    Signed-off-by: Neil Brown
    Signed-off-by: Greg Kroah-Hartman

    NeilBrown
     

03 Apr, 2006

1 commit

02 Apr, 2006

1 commit

01 Apr, 2006

1 commit

29 Mar, 2006

1 commit

  • 4b6f5d20b   [PATCH] Make most file operations structs in fs/ const ... Browse Code »

    This is a conversion to make the various file_operations structs in fs/
    const. Basically a regexp job, with a few manual fixups

    The goal is both to increase correctness (harder to accidentally write to
    shared datastructures) and reducing the false sharing of cachelines with
    things that get dirty in .data (while .rodata is nicely read only and thus
    cache clean)

    Signed-off-by: Arjan van de Ven
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Arjan van de Ven
     

21 Mar, 2006

5 commits

12 Jan, 2006

1 commit

10 Jan, 2006

1 commit

05 Jan, 2006

1 commit

27 Aug, 2005

1 commit

  • 36676bcbf   [PATCH] Fix oops in sysfs_hash_and_remove_file() ... Browse Code »

    The problem arises if an entity in sysfs is created and removed without
    ever having been made completely visible. In SCSI this is triggered by
    removing a device while it's initialising.

    The problem appears to be that because it was never made visible in sysfs,
    the sysfs dentry has a null d_inode which oopses when a reference is made
    to it. The solution is simply to check d_inode and assume the object was
    never made visible (and thus doesn't need deleting) if it's NULL.

    (akpm: possibly a stopgap for 2.6.13 scsi problems. May not be the
    long-term fix)

    Signed-off-by: James Bottomley
    Cc: Greg KH
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    James Bottomley
     

20 Aug, 2005

1 commit

  • cc314eef0   Fix nasty ncpfs symlink handling bug. ... Browse Code »

    This bug could cause oopses and page state corruption, because ncpfs
    used the generic page-cache symlink handlign functions. But those
    functions only work if the page cache is guaranteed to be "stable", ie a
    page that was installed when the symlink walk was started has to still
    be installed in the page cache at the end of the walk.

    We could have fixed ncpfs to not use the generic helper routines, but it
    is in many ways much cleaner to instead improve on the symlink walking
    helper routines so that they don't require that absolute stability.

    We do this by allowing "follow_link()" to return a error-pointer as a
    cookie, which is fed back to the cleanup "put_link()" routine. This
    also simplifies NFS symlink handling.

    Signed-off-by: Linus Torvalds

    Linus Torvalds
     

30 Jul, 2005

2 commits

  • 9ca1eb328   [PATCH] sysfs: fix sysfs_setattr ... Browse Code »

    o sysfs_dirent's s_mode field should also be updated in sysfs_setattr(), else
    there could be inconsistency in the two fields. s_mode is used while
    ->readdir so as not to bring in the inode to cache.

    Signed-off-by: Maneesh Soni
    Signed-off-by: Greg Kroah-Hartman
    Signed-off-by: Linus Torvalds

    Maneesh Soni
     
  • bc062b1b5   [PATCH] sysfs: fix sysfs_chmod_file ... Browse Code »

    o sysfs_chmod_file() must update the new iattr field in sysfs_dirent else
    the mode change will not be persistent in case of inode evacuation from
    cache.

    Signed-off-by: Maneesh Soni
    Signed-off-by: Greg Kroah-Hartman
    Signed-off-by: Linus Torvalds

    Maneesh Soni
     

13 Jul, 2005

1 commit

  • 0eeca2830   [PATCH] inotify ... Browse Code »

    inotify is intended to correct the deficiencies of dnotify, particularly
    its inability to scale and its terrible user interface:

    * dnotify requires the opening of one fd per each directory
    that you intend to watch. This quickly results in too many
    open files and pins removable media, preventing unmount.
    * dnotify is directory-based. You only learn about changes to
    directories. Sure, a change to a file in a directory affects
    the directory, but you are then forced to keep a cache of
    stat structures.
    * dnotify's interface to user-space is awful. Signals?

    inotify provides a more usable, simple, powerful solution to file change
    notification:

    * inotify's interface is a system call that returns a fd, not SIGIO.
    You get a single fd, which is select()-able.
    * inotify has an event that says "the filesystem that the item
    you were watching is on was unmounted."
    * inotify can watch directories or files.

    Inotify is currently used by Beagle (a desktop search infrastructure),
    Gamin (a FAM replacement), and other projects.

    See Documentation/filesystems/inotify.txt.

    Signed-off-by: Robert Love
    Cc: John McCutchan
    Cc: Christoph Hellwig
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Robert Love
     

24 Jun, 2005

2 commits

21 Jun, 2005

6 commits

01 May, 2005

1 commit

19 Apr, 2005

1 commit

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