[CC += linux-api] Hello Namjae Please, all patches such as this that touch the user-space ABI must CC linux-api@. (The kernel source file Documentation/SubmitChecklist notes that all Linux kernel patches that change userspace interfaces should be CCed to linux-api@xxxxxxxxxxxxxxx. See also https://www.kernel.org/doc/man-pages/linux-api-ml.html ) Thanks, Michael On Wed, Jan 21, 2015 at 4:11 PM, Namjae Jeon <linkinjeon@xxxxxxxxx> wrote: > 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 (11): > 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 > xfsprogs: xfs_io: add finsert command for insert range via fallocate > xfstests: generic/039: Standard insert range tests > xfstests: generic/040: Delayed allocation insert range > xfstests: generic/041: Multi insert range tests > xfstests: generic/042: Delayed allocation multi insert > xfstests: generic/043: Test multiple fallocate insert/collapse range calls > xfstests: fsstress: Add fallocate insert range operation > xfstests: fsx: Add fallocate insert range operation > -- > 1.7.9.5 > > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ -- Michael Kerrisk Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/ Author of "The Linux Programming Interface", http://blog.man7.org/ -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
