algorithm level range
lz4 3 - 16
zstd 1 - 22
-compress_log_size=%u Support configuring compress cluster size, the size will
- be 4KB * (1 << %u), 16KB is minimum size, also it's
- default size.
+compress_log_size=%u Support configuring compress cluster size. The size will
+ be 4KB * (1 << %u). The default and minimum sizes are 16KB.
compress_extension=%s Support adding specified extension, so that f2fs can enable
compression on those corresponding files, e.g. if all files
with '.ext' has high compression rate, we can set the '.ext'
mount idmapping: u0:k10000:r10000
Assume a file owned by ``u1000`` is read from disk. The filesystem maps this id
-to ``k21000`` according to it's idmapping. This is what is stored in the
+to ``k21000`` according to its idmapping. This is what is stored in the
inode's ``i_uid`` and ``i_gid`` fields.
When the caller queries the ownership of this file via ``stat()`` the kernel
The requirement for a static, fixed preallocated system area comes from how
qnx6fs deals with writes.
-Each superblock got it's own half of the system area. So superblock #1
+Each superblock got its own half of the system area. So superblock #1
always uses blocks from the lower half while superblock #2 just writes to
blocks represented by the upper half bitmap system area bits.
and relogged, so any tracking must be separate to the AIL infrastructure. As
such, we cannot reuse the AIL list pointers for tracking committed items, nor
can we store state in any field that is protected by the AIL lock. Hence the
-committed item tracking needs it's own locks, lists and state fields in the log
+committed item tracking needs its own locks, lists and state fields in the log
item.
Similar to the AIL, tracking of committed items is done through a new list
called the Committed Item List (CIL). The list tracks log items that have been
committed and have formatted memory buffers attached to them. It tracks objects
in transaction commit order, so when an object is relogged it is removed from
-it's place in the list and re-inserted at the tail. This is entirely arbitrary
+its place in the list and re-inserted at the tail. This is entirely arbitrary
and done to make it easy for debugging - the last items in the list are the
ones that are most recently modified. Ordering of the CIL is not necessary for
transactional integrity (as discussed in the next section) so the ordering is
the CIL during a transaction commit, then we do not pin it again. Because there
can be multiple outstanding checkpoint contexts, we can still see elevated pin
counts, but as each checkpoint completes the pin count will retain the correct
-value according to it's context.
+value according to its context.
Just to make matters slightly more complex, this checkpoint level context
for the pin count means that the pinning of an item must take place under the