1. 30 Nov, 2013 6 commits
    • Tejun Heo's avatar
      sysfs, kernfs: introduce kernfs_notify() · 024f6471
      Tejun Heo authored
      Introduce kernfs interface to wake up poll(2) which takes and returns
      sysfs_dirents.
      
      sysfs_notify_dirent() is renamed to kernfs_notify() and sysfs_notify()
      is updated so that it doesn't directly grab sysfs_mutex but acquires
      the target sysfs_dirents using sysfs_get_dirent().
      sysfs_notify_dirent() is reimplemented as a dumb inline wrapper around
      kernfs_notify().
      
      This patch doesn't introduce any behavior changes.
      Signed-off-by: default avatarTejun Heo <tj@kernel.org>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      024f6471
    • Tejun Heo's avatar
      sysfs, kernfs: add kernfs_ops->seq_{start|next|stop}() · d19b9846
      Tejun Heo authored
      kernfs_ops currently only supports single_open() behavior which is
      pretty restrictive.  Add optional callbacks ->seq_{start|next|stop}()
      which, when implemented, are invoked for seq_file traversal.  This
      allows full seq_file functionality for kernfs users.  This currently
      doesn't have any user and doesn't change any behavior.
      
      v2: Refreshed on top of the updated "sysfs, kernfs: prepare read path
          for kernfs".
      Signed-off-by: default avatarTejun Heo <tj@kernel.org>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      d19b9846
    • Tejun Heo's avatar
      sysfs, kernfs: introduce kernfs_create_file[_ns]() · 496f7394
      Tejun Heo authored
      Introduce kernfs interface to create a file which takes and returns
      sysfs_dirents.
      
      The actual file creation part is separated out from
      sysfs_add_file_mode_ns() into kernfs_create_file_ns().  The former now
      only decides the kernfs_ops to use and the file's size and invokes the
      latter.
      
      This patch doesn't introduce behavior changes.
      
      v2: Dummy implementation for !CONFIG_SYSFS updated to return -ENOSYS.
      Signed-off-by: default avatarTejun Heo <tj@kernel.org>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      496f7394
    • Tejun Heo's avatar
      sysfs, kernfs: introduce kernfs_ops · f6acf8bb
      Tejun Heo authored
      We're in the process of separating out core sysfs functionality into
      kernfs which will deal with sysfs_dirents directly.  This patch
      introduces kernfs_ops which hosts methods kernfs users implement and
      updates fs/sysfs/file.c such that sysfs_kf_*() functions populate
      kernfs_ops and kernfs_file_*() functions call the matching entries
      from kernfs_ops.
      
      kernfs_ops contains the following groups of methods.
      
      * seq_show() - for kernfs files which use seq_file for reads.
      
      * read() - for direct read implementations.  Used iff seq_show() is
        not implemented.
      
      * write() - for writes.
      
      * mmap() - for mmaps.
      
      Notes:
      
      * sysfs_elem_attr->ops is added so that kernfs_ops can be accessed
        from sysfs_dirent.  kernfs_ops() helper is added to verify locking
        and access the field.
      
      * SYSFS_FLAG_HAS_(SEQ_SHOW|MMAP) added.  sd->s_attr->ops is accessible
        only while holding active_ref and there are cases where we want to
        take different actions depending on which ops are implemented.
        These two flags cache whether the two ops are implemented for those.
      
      * kernfs_file_*() no longer test sysfs type but chooses different
        behaviors depending on which methods in kernfs_ops are implemented.
        The conversions are trivial except for the open path.  As
        kernfs_file_open() now decides whether to allow read/write accesses
        depending on the kernfs_ops implemented, the presence of methods in
        kobjs and attribute_bin should be propagated to kernfs_ops.
        sysfs_add_file_mode_ns() is updated so that it propagates presence /
        absence of the callbacks through _empty, _ro, _wo, _rw kernfs_ops.
      Signed-off-by: default avatarTejun Heo <tj@kernel.org>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      f6acf8bb
    • Tejun Heo's avatar
      sysfs, kernfs: move sysfs_open_file to include/linux/kernfs.h · dd8a5b03
      Tejun Heo authored
      sysfs_open_file will be used as the primary handle for kernfs methods.
      Move its definition from fs/sysfs/file.c to include/linux/kernfs.h and
      mark the public and private fields.
      
      This is pure relocation.
      Signed-off-by: default avatarTejun Heo <tj@kernel.org>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      dd8a5b03
    • Tejun Heo's avatar
      sysfs, kernfs: introduce kernfs_create_dir[_ns]() · 93b2b8e4
      Tejun Heo authored
      Introduce kernfs interface to manipulate a directory which takes and
      returns sysfs_dirents.
      
      create_dir() is renamed to kernfs_create_dir_ns() and its argumantes
      and return value are updated.  create_dir() usages are replaced with
      kernfs_create_dir_ns() and sysfs_create_subdir() usages are replaced
      with kernfs_create_dir().  Dup warnings are handled explicitly by
      sysfs users of the kernfs interface.
      
      sysfs_enable_ns() is renamed to kernfs_enable_ns().
      
      This patch doesn't introduce any behavior changes.
      
      v2: Dummy implementation for !CONFIG_SYSFS updated to return -ENOSYS.
      
      v3: kernfs_enable_ns() added.
      
      v4: Refreshed on top of "sysfs: drop kobj_ns_type handling, take #2"
          so that this patch removes sysfs_enable_ns().
      Signed-off-by: default avatarTejun Heo <tj@kernel.org>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      93b2b8e4
  2. 27 Nov, 2013 5 commits
    • Tejun Heo's avatar
      sysfs, kernfs: introduce kernfs_setattr() · 5d60418e
      Tejun Heo authored
      Introduce kernfs setattr interface - kernfs_setattr().
      
      sysfs_sd_setattr() is renamed to __kernfs_setattr() and
      kernfs_setattr() is a simple wrapper around it with sysfs_mutex
      locking.  sysfs_chmod_file() is updated to get an explicit ref on
      kobj->sd and then invoke kernfs_setattr() so that it doesn't have to
      use internal interface.
      
      This patch doesn't introduce any behavior differences.
      
      v2: Dummy implementation for !CONFIG_SYSFS updated to return -ENOSYS.
      Signed-off-by: default avatarTejun Heo <tj@kernel.org>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      5d60418e
    • Tejun Heo's avatar
      sysfs, kernfs: introduce kernfs_rename[_ns]() · 890ece16
      Tejun Heo authored
      Introduce kernfs rename interface, krenfs_rename[_ns]().
      
      This is just rename of sysfs_rename().  No functional changes.
      Function comment is added to kernfs_rename_ns() and @new_parent_sd is
      renamed to @new_parent for consistency with other kernfs interfaces.
      
      v2: Dummy implementation for !CONFIG_SYSFS updated to return -ENOSYS.
      Signed-off-by: default avatarTejun Heo <tj@kernel.org>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      890ece16
    • Tejun Heo's avatar
      sysfs, kernfs: introduce kernfs_create_link() · 5d0e26bb
      Tejun Heo authored
      Separate out kernfs symlink interface - kernfs_create_link() - which
      takes and returns sysfs_dirents, from sysfs_do_create_link_sd().
      sysfs_do_create_link_sd() now just determines the parent and target
      sysfs_dirents and invokes the new interface and handles dup warning.
      
      This patch doesn't introduce behavior changes.
      
      v2: Dummy implementation for !CONFIG_SYSFS updated to return -ENOSYS.
      Signed-off-by: default avatarTejun Heo <tj@kernel.org>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      5d0e26bb
    • Tejun Heo's avatar
      sysfs, kernfs: introduce kernfs_remove[_by_name[_ns]]() · 879f40d1
      Tejun Heo authored
      Introduce kernfs removal interfaces - kernfs_remove() and
      kernfs_remove_by_name[_ns]().
      
      These are just renames of sysfs_remove() and sysfs_hash_and_remove().
      No functional changes.
      
      v2: Dummy kernfs_remove_by_name_ns() for !CONFIG_SYSFS updated to
          return -ENOSYS instead of 0.
      Signed-off-by: default avatarTejun Heo <tj@kernel.org>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      879f40d1
    • Tejun Heo's avatar
      sysfs, kernfs: add skeletons for kernfs · b8441ed2
      Tejun Heo authored
      Core sysfs implementation will be separated into kernfs so that it can
      be used by other non-kobject users.
      
      This patch creates fs/kernfs/ directory and makes boilerplate changes.
      kernfs interface will be directly based on sysfs_dirent and its
      forward declaration is moved to include/linux/kernfs.h which is
      included from include/linux/sysfs.h.  sysfs core implementation will
      be gradually separated out and moved to kernfs.
      
      This patch doesn't introduce any functional changes.
      
      v2: mount.c added.
      Signed-off-by: default avatarTejun Heo <tj@kernel.org>
      Cc: linux-fsdevel@vger.kernel.org
      Cc: Christoph Hellwig <hch@infradead.org>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      b8441ed2