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982d816581
linux/Documentation/filesystems
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Josef Bacik 982d816581 fs: add SEEK_HOLE and SEEK_DATA flags 
This just gets us ready to support the SEEK_HOLE and SEEK_DATA flags.  Turns out
using fiemap in things like cp cause more problems than it solves, so lets try
and give userspace an interface that doesn't suck.  We need to match solaris
here, and the definitions are

*o* If /whence/ is SEEK_HOLE, the offset of the start of the
next hole greater than or equal to the supplied offset
is returned. The definition of a hole is provided near
the end of the DESCRIPTION.

*o* If /whence/ is SEEK_DATA, the file pointer is set to the
start of the next non-hole file region greater than or
equal to the supplied offset.

So in the generic case the entire file is data and there is a virtual hole at
the end.  That means we will just return i_size for SEEK_HOLE and will return
the same offset for SEEK_DATA.  This is how Solaris does it so we have to do it
the same way.

Thanks,

Signed-off-by: Josef Bacik <josef@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-07-20 20:47:56 -04:00
..
caching FS-Cache: Add a helper to bulk uncache pages on an inode 2011-07-07 13:21:56 -07:00
configfs Documentation: configfs examples crash fix 2011-05-26 17:12:34 -07:00
nfs Create Documentation/security/, 2011-05-19 15:59:38 -07:00
pohmelfs Fix common misspellings 2011-03-31 11:26:23 -03:00
9p.txt 9p: update Documentation pointers 2011-05-25 09:33:05 -05:00
00-INDEX smbfs: move to drivers/staging 2010-10-05 09:08:21 -07:00
adfs.txt adfs: add hexadecimal filetype suffix option 2011-03-22 17:44:17 -07:00
affs.txt Documentation: update broken web addresses. 2010-08-04 15:21:40 +02:00
afs.txt AFS: Documentation updates 2009-08-19 10:40:13 -07:00
autofs4-mount-control.txt Fix common misspellings 2011-03-31 11:26:23 -03:00
automount-support.txt
befs.txt Documentation: update broken web addresses. 2010-08-04 15:21:40 +02:00
bfs.txt remove mention of CONFIG_KMOD from documentation 2008-07-22 19:24:29 +10:00
btrfs.txt Btrfs: Add Documentation/filesystem/btrfs.txt, remove old COPYING 2009-01-07 09:54:24 -05:00
ceph.txt Documentation/: it's -> its where appropriate 2010-04-23 02:09:52 +02:00
cifs.txt
coda.txt
cramfs.txt
debugfs.txt Document the debugfs API 2009-06-06 10:28:14 -06:00
devpts.txt Document usage of multiple-instances of devpts 2009-01-02 10:19:36 -08:00
directory-locking
dlmfs.txt Documentation/: it's -> its where appropriate 2010-04-23 02:09:52 +02:00
dnotify_test.c Documentation/fs/: split txt and source files 2010-03-12 15:52:35 -08:00
dnotify.txt Documentation/fs/: split txt and source files 2010-03-12 15:52:35 -08:00
ecryptfs.txt
exofs.txt exofs: Add option to mount by osdname 2011-03-15 15:02:51 +02:00
ext2.txt Doc fix: ext2 can only have 32,000 subdirs, not 32,768 2009-06-18 13:03:44 -07:00
ext3.txt ext3: make barrier options consistent with ext4 2010-05-21 19:30:41 +02:00
ext4.txt ext4: remove obsolete mount options from ext4's documentation 2011-05-01 18:14:26 -04:00
fiemap.txt Documentation/: it's -> its where appropriate 2010-04-23 02:09:52 +02:00
files.txt fix f_count description in Documentation/filesystems/files.txt 2008-12-31 18:07:42 -05:00
fuse.txt Documentation/: it's -> its where appropriate 2010-04-23 02:09:52 +02:00
gfs2-glocks.txt GFS2: Update docs 2009-05-19 10:23:23 +01:00
gfs2-uevents.txt Fix common misspellings 2011-03-31 11:26:23 -03:00
gfs2.txt Fix common misspellings 2011-03-31 11:26:23 -03:00
hfs.txt
hfsplus.txt
hpfs.txt Documentation/: it's -> its where appropriate 2010-04-23 02:09:52 +02:00
inotify.txt
isofs.txt Documentation: update broken web addresses. 2010-08-04 15:21:40 +02:00
jfs.txt
Locking ->permission() sanitizing: don't pass flags to ->check_acl() 2011-07-20 01:43:21 -04:00
locks.txt
logfs.txt fix "seperate" typos in comments 2010-05-10 11:56:30 +02:00
Makefile Documentation/fs/: split txt and source files 2010-03-12 15:52:35 -08:00
mandatory-locking.txt
ncpfs.txt ncpfs: remove dead URL from documentation 2009-09-23 07:39:42 -07:00
nilfs2.txt nilfs2: remove resize from unsupported features list 2011-07-13 16:08:59 +09:00
ntfs.txt Fix common misspellings 2011-03-31 11:26:23 -03:00
ocfs2.txt ocfs2: clean up mount option about atime in ocfs2.txt 2011-05-23 23:37:12 -07:00
omfs.txt omfs: add filesystem documentation 2008-07-26 12:00:05 -07:00
path-lookup.txt Fix common misspellings 2011-03-31 11:26:23 -03:00
porting fs: add SEEK_HOLE and SEEK_DATA flags 2011-07-20 20:47:56 -04:00
proc.txt rcu: Use softirq to address performance regression 2011-06-14 15:25:39 -07:00
quota.txt quota: documentation for sending "below quota" messages via netlink and tiny doc update 2008-08-12 16:07:27 -07:00
ramfs-rootfs-initramfs.txt Trivial Documentation/filesystems/ramfs-rootfs-initramfs.txt fix 2008-11-30 11:40:56 -08:00
relay.txt relay: add buffer-only channels; useful for early logging 2008-07-26 12:00:04 -07:00
romfs.txt Documentation/filesystems/romfs.txt: fixing link to genromfs 2011-02-17 22:04:46 +01:00
seq_file.txt seq_file: use proc_create() in documentation 2009-12-16 07:20:07 -08:00
sharedsubtree.txt Documentation: Fix trivial typo in filesystems/sharedsubtree.txt 2010-10-25 21:18:21 -04:00
spufs.txt
squashfs.txt Fix common misspellings 2011-03-31 11:26:23 -03:00
sysfs-pci.txt PCI: Allow read/write access to sysfs I/O port resources 2010-07-30 09:32:08 -07:00
sysfs-tagging.txt sysfs-namespaces: add a high-level Documentation file 2010-05-21 09:37:31 -07:00
sysfs.txt Fix common misspellings 2011-03-31 11:26:23 -03:00
sysv-fs.txt
tmpfs.txt mempolicy: document cpuset interaction with tmpfs mpol mount option 2010-05-25 08:06:57 -07:00
ubifs.txt UBIFS: switch to dynamic printks 2011-05-23 08:22:20 +03:00
udf.txt udf: implement mode and dmode mounting options 2009-04-02 12:29:50 +02:00
ufs.txt
vfat.txt Documentation: update broken web addresses. 2010-08-04 15:21:40 +02:00
vfs.txt vfs: increase shrinker batch size 2011-07-20 20:47:41 -04:00
xfs-delayed-logging-design.txt Fix common misspellings 2011-03-31 11:26:23 -03:00
xfs.txt xfs: add online discard support 2011-05-24 11:17:13 -05:00
xip.txt DOC: update xip method info 2008-11-12 17:17:17 -08:00