[PATCH v10 0/12] fs: Introduce FALLOC_FL_INSERT_RANGE for fallocate

From: Namjae Jeon
Date: Sat Feb 21 2015 - 10:48:46 EST

From: Namjae Jeon <namjae.jeon@xxxxxxxxxxx>

In continuation of the work of making the process of non linear editing of
media files faster, we introduce here the new flag FALLOC_FL_INSERT_RANGE
for fallocate.

This flag will work opposite to the FALLOC_FL_COLLAPSE_RANGE flag.
As such, specifying FALLOC_FL_INSERT_RANGE flag will create new space inside file
by inserting a hole within the range specified by offset and len.
User can write new data in this space. e.g. ads.
Like collapse range, currently we have the limitation that offset and len should
be block size aligned for both XFS and Ext4.

The semantics of the flag are :
1) It creates space within file by inserting a hole of len bytes starting
at offset byte without overwriting any existing data. All the data blocks
from offset to EOF are shifted towards right to make hole space.
2) It should be used exclusively. No other fallocate flag in combination.
3) Offset and length supplied to fallocate should be fs block size aligned
in case of xfs and ext4.
4) Insert range does not work for the case when offset is overlapping/beyond
i_size. If the user wants to insert space at the end of file they are
advised to use either ftruncate(2) or fallocate(2) with mode 0.
5) It increses the size of file by len bytes.

Namjae Jeon (12):
fs: Add support FALLOC_FL_INSERT_RANGE for fallocate
xfs: Add support FALLOC_FL_INSERT_RANGE for fallocate
ext4: Add support FALLOC_FL_INSERT_RANGE for fallocate
xfsprog: xfsio: update xfs_io manpage for FALLOC_FL_INSERT_RANGE
xfstests: generic/042: Standard insert range tests
xfstests: generic/043: Delayed allocation insert range
xfstests: generic/044: Multi insert range tests
xfstests: generic/045: Delayed allocation multi insert
xfstests: generic/046: Test multiple fallocate insert/collapse range calls
xfstests: fsstress: Add fallocate insert range operation
xfstests: fsx: Add fallocate insert range operation
manpage: update FALLOC_FL_INSERT_RANGE flag in fallocate

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