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sysfs: copy bin mmap support from fs/sysfs/bin.c to fs/sysfs/file.c

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sysfs bin file handling will be merged into the regular file support.
This patch copies mmap support from bin so that fs/sysfs/file.c can
handle mmapping bin files.

The code is copied mostly verbatim with the following updates.

* ->mmapped and ->vm_ops are added to sysfs_open_file and bin_buffer
  references are replaced with sysfs_open_file ones.

* Symbols are prefixed with sysfs_.

* sysfs_unmap_bin_file() grabs sysfs_open_dirent and traverses
  ->files.  Invocation of this function is added to
  sysfs_addrm_finish().

* sysfs_bin_mmap() is added to sysfs_bin_operations.

This is a preparation and the new mmap path isn't used yet.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Tejun Heo 2013-10-01 17:42:07 -04:00 • committed by Greg Kroah-Hartman
parent 2f0c6b7593
commit 73d9714627
3 changed files with 249 additions and 1 deletions
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1
fs/sysfs/dir.c
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@ -595,6 +595,7 @@ void sysfs_addrm_finish(struct sysfs_addrm_cxt *acxt)
acxt->removed = sd->u.removed_list;
sysfs_deactivate(sd);
sysfs_unmap_bin_file(sd);
unmap_bin_file(sd);
sysfs_put(sd);
}