android_kernel_xiaomi_sm8350/arch/powerpc
Amit Arora 97ac73506c sys_fallocate() implementation on i386, x86_64 and powerpc
fallocate() is a new system call being proposed here which will allow
applications to preallocate space to any file(s) in a file system.
Each file system implementation that wants to use this feature will need
to support an inode operation called ->fallocate().
Applications can use this feature to avoid fragmentation to certain
level and thus get faster access speed. With preallocation, applications
also get a guarantee of space for particular file(s) - even if later the
the system becomes full.

Currently, glibc provides an interface called posix_fallocate() which
can be used for similar cause. Though this has the advantage of working
on all file systems, but it is quite slow (since it writes zeroes to
each block that has to be preallocated). Without a doubt, file systems
can do this more efficiently within the kernel, by implementing
the proposed fallocate() system call. It is expected that
posix_fallocate() will be modified to call this new system call first
and incase the kernel/filesystem does not implement it, it should fall
back to the current implementation of writing zeroes to the new blocks.
ToDos:
1. Implementation on other architectures (other than i386, x86_64,
   and ppc). Patches for s390(x) and ia64 are already available from
   previous posts, but it was decided that they should be added later
   once fallocate is in the mainline. Hence not including those patches
   in this take.
2. Changes to glibc,
   a) to support fallocate() system call
   b) to make posix_fallocate() and posix_fallocate64() call fallocate()

Signed-off-by: Amit Arora <aarora@in.ibm.com>
2007-07-17 21:42:44 -04:00
..
boot [POWERPC] Fix typo in Ebony default DTS 2007-07-10 22:03:16 +10:00
configs Merge branch 'for-2.6.23' into merge 2007-07-11 13:28:26 +10:00
kernel sys_fallocate() implementation on i386, x86_64 and powerpc 2007-07-17 21:42:44 -04:00
lib [POWERPC] rheap - eliminates internal fragments caused by alignment 2007-06-19 22:35:53 -05:00
math-emu
mm Merge branch 'for-2.6.23' into merge 2007-07-11 13:28:26 +10:00
oprofile [POWERPC] Oprofile enhanced instruction sampling support 2007-07-10 21:55:48 +10:00
platforms Cell: Draw SPE helper penguin logos 2007-07-17 10:23:13 -07:00
sysdev [POWERPC] Create add_rtc() function to enable the RTC CMOS driver 2007-07-11 13:24:40 +10:00
xmon [POWERPC] Make two xmon variables static 2007-07-10 21:55:46 +10:00
.gitignore
Kconfig Kprobes on select architectures no longer EXPERIMENTAL 2007-07-17 10:23:03 -07:00
Kconfig.debug Fix trivial typos in Kconfig* files 2007-05-09 07:12:20 +02:00
Makefile [POWERPC] Remove 'make zImage.dts' feature 2007-06-25 16:58:12 +10:00