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wic/filemap: Fall back to standard copy when no way to get the block map

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For some filesystems, such as aufs which may be used by docker container,
don't support either the SEEK_DATA/HOLE or FIEMAP to get the block
map. So add a FileNobmap class to fall back to standard copy when there
is no way to get the block map.

[Yocto #12988]

(From OE-Core rev: 7934ed49179242f15b413c0275040a3bb6b68876)

Signed-off-by: Kevin Hao <kexin.hao@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Kevin Hao 2020-07-14 08:53:23 +08:00 committed by Richard Purdie
parent 2212d938c5
commit b617cd5b47
1 changed files with 27 additions and 1 deletions
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28
scripts/lib/wic/filemap.py
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@ -469,6 +469,29 @@ class FilemapFiemap(_FilemapBase):
% (first_prev, last_prev))
yield (first_prev, last_prev)
class FilemapNobmap(_FilemapBase):
"""
This class is used when both the 'SEEK_DATA/HOLE' and FIEMAP are not
supported by the filesystem or kernel.
"""
def __init__(self, image, log=None):
"""Refer the '_FilemapBase' class for the documentation."""
# Call the base class constructor first
_FilemapBase.__init__(self, image, log)
self._log.debug("FilemapNobmap: initializing")
def block_is_mapped(self, block):
"""Refer the '_FilemapBase' class for the documentation."""
return True
def get_mapped_ranges(self, start, count):
"""Refer the '_FilemapBase' class for the documentation."""
self._log.debug("FilemapNobmap: get_mapped_ranges(%d, %d(%d))"
% (start, count, start + count - 1))
yield (start, start + count -1)
def filemap(image, log=None):
"""
Create and return an instance of a Filemap class - 'FilemapFiemap' or
@ -482,7 +505,10 @@ def filemap(image, log=None):
try:
return FilemapFiemap(image, log)
except ErrorNotSupp:
return FilemapSeek(image, log)
try:
return FilemapSeek(image, log)
except ErrorNotSupp:
return FilemapNobmap(image, log)
def sparse_copy(src_fname, dst_fname, skip=0, seek=0,
length=0, api=None):