Lukas Czerner
27dd438542
ext4: introduce reserved space ...
Currently in ENOSPC condition when writing into unwritten space, or
punching a hole, we might need to split the extent and grow extent tree.
However since we can not allocate any new metadata blocks we'll have to
zero out unwritten part of extent or punched out part of extent, or in
the worst case return ENOSPC even though use actually does not allocate
any space.
Also in delalloc path we do reserve metadata and data blocks for the
time we're going to write out, however metadata block reservation is
very tricky especially since we expect that logical connectivity implies
physical connectivity, however that might not be the case and hence we
might end up allocating more metadata blocks than previously reserved.
So in future, metadata reservation checks should be removed since we can
not assure that we do not under reserve.
And this is where reserved space comes into the picture. When mounting
the file system we slice off a little bit of the file system space (2%
or 4096 clusters, whichever is smaller) which can be then used for the
cases mentioned above to prevent costly zeroout, or unexpected ENOSPC.
The number of reserved clusters can be set via sysfs, however it can
never be bigger than number of free clusters in the file system.
Note that this patch fixes the failure of xfstest 274 as expected.
Signed-off-by: Lukas Czerner <lczerner@redhat.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Reviewed-by: Carlos Maiolino <cmaiolino@redhat.com>
2013-04-09 22:11:22 -04:00
FS-Cache: Provide proper invalidation
2012-12-20 22:04:07 +00:00
configfs: convert to umode_t
2012-01-03 22:54:57 -05:00
nfsd4: delay filling in write iovec array till after xdr decoding
2012-11-26 09:08:15 -05:00
Documentation: Fix multiple typo in Documentation
2012-03-07 16:08:24 +01:00
Introduce a new file system, Flash-Friendly File System (F2FS), to Linux 3.8.
2012-12-20 13:54:52 -08:00
9p: fix 9p.txt to advertise msize instead of maxdata
2011-10-24 11:13:12 -05:00
adfs: add hexadecimal filetype suffix option
2011-03-22 17:44:17 -07:00
Documentation: update broken web addresses.
2010-08-04 15:21:40 +02:00
AFS: Documentation updates
2009-08-19 10:40:13 -07:00
Fix common misspellings
2011-03-31 11:26:23 -03:00
Documentation: befs.txt: no maintainer, orphaned
2011-08-13 18:34:03 -07:00
Fix URL of btrfs-progs git repository in docs
2011-11-30 18:46:02 +01:00
ceph: enable/disable dentry complete flags via mount option
2012-01-12 11:00:40 -08:00
debugfs: more tightly restrict default mount mode
2012-08-27 13:42:02 -07:00
Document usage of multiple-instances of devpts
2009-01-02 10:19:36 -08:00
Documentation/: it's -> its where appropriate
2010-04-23 02:09:52 +02:00
Documentation/fs/: split txt and source files
2010-03-12 15:52:35 -08:00
Documentation/fs/: split txt and source files
2010-03-12 15:52:35 -08:00
efivarfs: Add documentation for the EFI variable filesystem
2012-10-30 10:39:18 +00:00
exofs: Add option to mount by osdname
2011-03-15 15:02:51 +02:00
Doc fix: ext2 can only have 32,000 subdirs, not 32,768
2009-06-18 13:03:44 -07:00
ext3: update documentation with barrier=1 default
2012-04-11 11:12:45 +02:00
ext4: introduce reserved space
2013-04-09 22:11:22 -04:00
f2fs: update f2fs document to reflect SIT/NAT layout correctly
2013-01-04 09:42:59 +09:00
Documentation/: it's -> its where appropriate
2010-04-23 02:09:52 +02:00
Wrap accesses to the fd_sets in struct fdtable
2012-02-19 10:30:52 -08:00
Documentation/: it's -> its where appropriate
2010-04-23 02:09:52 +02:00
GFS2: Update glock doc to add new stats info
2012-05-10 12:41:40 +01:00
Documentation: Fix multiple typo in Documentation
2012-03-07 16:08:24 +01:00
GFS2: Update main gfs2 doc
2012-05-10 11:45:31 +01:00
Documentation: HFS is orphaned
2011-11-04 12:01:48 -07:00
Documentation/: it's -> its where appropriate
2010-04-23 02:09:52 +02:00
Documentation: fix inotify source file paths
2011-11-04 12:01:47 -07:00
Documentation: update broken web addresses.
2010-08-04 15:21:40 +02:00
jfs: Remove obsolete email address
2012-09-17 12:00:01 -05:00
vfs: kill FS_REVAL_DOT by adding a d_weak_revalidate dentry op
2013-02-26 02:46:09 -05:00
doc: fix broken references
2011-09-27 18:08:04 +02:00
fix "seperate" typos in comments
2010-05-10 11:56:30 +02:00
Documentation/fs/: split txt and source files
2010-03-12 15:52:35 -08:00
ncpfs: remove dead URL from documentation
2009-09-23 07:39:42 -07:00
nilfs2: remove resize from unsupported features list
2011-07-13 16:08:59 +09:00
Fix common misspellings
2011-03-31 11:26:23 -03:00
ocfs2: clean up mount option about atime in ocfs2.txt
2011-05-23 23:37:12 -07:00
Fix common misspellings
2011-03-31 11:26:23 -03:00
vfs: kill FS_REVAL_DOT by adding a d_weak_revalidate dentry op
2013-02-26 02:46:09 -05:00
docs: update documentation about /proc/<pid>/fdinfo/<fd> fanotify output
2012-12-17 17:15:28 -08:00
Documentation: Fix typo in multiple files in Documentation
2012-04-16 14:37:13 +02:00
Documentation: Fix Broken URL "freshmeat"
2012-02-21 11:43:45 +01:00
Documentation/filesystems/romfs.txt: fixing link to genromfs
2011-02-17 22:04:46 +01:00
seq_file: use proc_create() in documentation
2009-12-16 07:20:07 -08:00
Documentation: Fix trivial typo in filesystems/sharedsubtree.txt
2010-10-25 21:18:21 -04:00
Squashfs: Update documentation to include xattrs
2011-12-30 01:20:24 +00:00
PCI: Allow read/write access to sysfs I/O port resources
2010-07-30 09:32:08 -07:00
sysfs-namespaces: add a high-level Documentation file
2010-05-21 09:37:31 -07:00
sysfs: propagate umode_t
2012-01-03 22:55:03 -05:00
mempolicy: document cpuset interaction with tmpfs mpol mount option
2010-05-25 08:06:57 -07:00
UBIFS: switch self-check knobs to debugfs
2011-07-04 10:54:28 +03:00
udf: implement mode and dmode mounting options
2009-04-02 12:29:50 +02:00
fat: provide option for setting timezone offset
2012-12-17 17:15:22 -08:00
vfs: kill FS_REVAL_DOT by adding a d_weak_revalidate dentry op
2013-02-26 02:46:09 -05:00
Fix common misspellings
2011-03-31 11:26:23 -03:00
xfs: Remove the description of nodelaylog mount option from xfs.txt
2012-11-26 16:00:51 -06:00
DOC: update xip method info
2008-11-12 17:17:17 -08:00
27dd438542